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skd: Fix checkpatch ERRORS and removed unused functions
[mirror_ubuntu-bionic-kernel.git] / drivers / block / skd_main.c
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e67f86b3
AB		 1/* Copyright 2012 STEC, Inc.
2 *
3 * This file is licensed under the terms of the 3-clause
4 * BSD License (http://opensource.org/licenses/BSD-3-Clause)
5 * or the GNU GPL-2.0 (http://www.gnu.org/licenses/gpl-2.0.html),
6 * at your option. Both licenses are also available in the LICENSE file
7 * distributed with this project. This file may not be copied, modified,
8 * or distributed except in accordance with those terms.
9 * Gordoni Waidhofer <gwaidhofer@stec-inc.com>
10 * Initial Driver Design!
11 * Thomas Swann <tswann@stec-inc.com>
12 * Interrupt handling.
13 * Ramprasad Chinthekindi <rchinthekindi@stec-inc.com>
14 * biomode implementation.
15 * Akhil Bhansali <abhansali@stec-inc.com>
16 * Added support for DISCARD / FLUSH and FUA.
17 */
18
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/init.h>
22#include <linux/pci.h>
23#include <linux/slab.h>
24#include <linux/spinlock.h>
25#include <linux/blkdev.h>
26#include <linux/sched.h>
27#include <linux/interrupt.h>
28#include <linux/compiler.h>
29#include <linux/workqueue.h>
30#include <linux/bitops.h>
31#include <linux/delay.h>
32#include <linux/time.h>
33#include <linux/hdreg.h>
34#include <linux/dma-mapping.h>
35#include <linux/completion.h>
36#include <linux/scatterlist.h>
37#include <linux/version.h>
38#include <linux/err.h>
39#include <linux/scatterlist.h>
40#include <linux/aer.h>
41#include <linux/ctype.h>
42#include <linux/wait.h>
43#include <linux/uio.h>
44#include <scsi/scsi.h>
45#include <scsi/scsi_host.h>
46#include <scsi/scsi_tcq.h>
47#include <scsi/scsi_cmnd.h>
48#include <scsi/sg.h>
49#include <linux/io.h>
50#include <linux/uaccess.h>
51#include <asm-generic/unaligned.h>
52
53#include "skd_s1120.h"
54
55static int skd_dbg_level;
56static int skd_isr_comp_limit = 4;
57
58enum {
59 STEC_LINK_2_5GTS = 0,
60 STEC_LINK_5GTS = 1,
61 STEC_LINK_8GTS = 2,
62 STEC_LINK_UNKNOWN = 0xFF
63};
64
65enum {
66 SKD_FLUSH_INITIALIZER,
67 SKD_FLUSH_ZERO_SIZE_FIRST,
68 SKD_FLUSH_DATA_SECOND,
69};
70
71#define DPRINTK(skdev, fmt, args ...) \
72 do { \
73 if (unlikely((skdev)->dbg_level > 0)) { \
74 pr_err("%s:%s:%d " fmt, (skdev)->name, \
75 __func__, __LINE__, ## args); \
76 } \
77 } while (0)
78
79#define SKD_ASSERT(expr) \
80 do { \
81 if (unlikely(!(expr))) { \
82 pr_err("Assertion failed! %s,%s,%s,line=%d\n", \
83 # expr, __FILE__, __func__, __LINE__); \
84 } \
85 } while (0)
86
87#define VPRINTK(skdev, fmt, args ...) \
88 do { \
89 if (unlikely((skdev)->dbg_level > 1)) { \
90 pr_err("%s:%s:%d " fmt, (skdev)->name, \
91 __func__, __LINE__, ## args); \
92 } \
93 } while (0)
94
95
96#define DRV_NAME "skd"
97#define DRV_VERSION "2.2.1"
98#define DRV_BUILD_ID "0260"
99#define PFX DRV_NAME ": "
100#define DRV_BIN_VERSION 0x100
101#define DRV_VER_COMPL "2.2.1." DRV_BUILD_ID
102
103MODULE_AUTHOR("bug-reports: support@stec-inc.com");
104MODULE_LICENSE("Dual BSD/GPL");
105
106MODULE_DESCRIPTION("STEC s1120 PCIe SSD block/BIO driver (b" DRV_BUILD_ID ")");
107MODULE_VERSION(DRV_VERSION "-" DRV_BUILD_ID);
108
109#define PCI_VENDOR_ID_STEC 0x1B39
110#define PCI_DEVICE_ID_S1120 0x0001
111
112#define SKD_FUA_NV (1 << 1)
113#define SKD_MINORS_PER_DEVICE 16
114
115#define SKD_MAX_QUEUE_DEPTH 200u
116
117#define SKD_PAUSE_TIMEOUT (5 * 1000)
118
119#define SKD_N_FITMSG_BYTES (512u)
120
121#define SKD_N_SPECIAL_CONTEXT 32u
122#define SKD_N_SPECIAL_FITMSG_BYTES (128u)
123
124/* SG elements are 32 bytes, so we can make this 4096 and still be under the
125 * 128KB limit. That allows 4096*4K = 16M xfer size
126 */
127#define SKD_N_SG_PER_REQ_DEFAULT 256u
128#define SKD_N_SG_PER_SPECIAL 256u
129
130#define SKD_N_COMPLETION_ENTRY 256u
131#define SKD_N_READ_CAP_BYTES (8u)
132
133#define SKD_N_INTERNAL_BYTES (512u)
134
135/* 5 bits of uniqifier, 0xF800 */
136#define SKD_ID_INCR (0x400)
137#define SKD_ID_TABLE_MASK (3u << 8u)
138#define SKD_ID_RW_REQUEST (0u << 8u)
139#define SKD_ID_INTERNAL (1u << 8u)
140#define SKD_ID_SPECIAL_REQUEST (2u << 8u)
141#define SKD_ID_FIT_MSG (3u << 8u)
142#define SKD_ID_SLOT_MASK 0x00FFu
143#define SKD_ID_SLOT_AND_TABLE_MASK 0x03FFu
144
145#define SKD_N_TIMEOUT_SLOT 4u
146#define SKD_TIMEOUT_SLOT_MASK 3u
147
148#define SKD_N_MAX_SECTORS 2048u
149
150#define SKD_MAX_RETRIES 2u
151
152#define SKD_TIMER_SECONDS(seconds) (seconds)
153#define SKD_TIMER_MINUTES(minutes) ((minutes) * (60))
154
155#define INQ_STD_NBYTES 36
156#define SKD_DISCARD_CDB_LENGTH 24
157
158enum skd_drvr_state {
159 SKD_DRVR_STATE_LOAD,
160 SKD_DRVR_STATE_IDLE,
161 SKD_DRVR_STATE_BUSY,
162 SKD_DRVR_STATE_STARTING,
163 SKD_DRVR_STATE_ONLINE,
164 SKD_DRVR_STATE_PAUSING,
165 SKD_DRVR_STATE_PAUSED,
166 SKD_DRVR_STATE_DRAINING_TIMEOUT,
167 SKD_DRVR_STATE_RESTARTING,
168 SKD_DRVR_STATE_RESUMING,
169 SKD_DRVR_STATE_STOPPING,
170 SKD_DRVR_STATE_FAULT,
171 SKD_DRVR_STATE_DISAPPEARED,
172 SKD_DRVR_STATE_PROTOCOL_MISMATCH,
173 SKD_DRVR_STATE_BUSY_ERASE,
174 SKD_DRVR_STATE_BUSY_SANITIZE,
175 SKD_DRVR_STATE_BUSY_IMMINENT,
176 SKD_DRVR_STATE_WAIT_BOOT,
177 SKD_DRVR_STATE_SYNCING,
178};
179
180#define SKD_WAIT_BOOT_TIMO SKD_TIMER_SECONDS(90u)
181#define SKD_STARTING_TIMO SKD_TIMER_SECONDS(8u)
182#define SKD_RESTARTING_TIMO SKD_TIMER_MINUTES(4u)
183#define SKD_DRAINING_TIMO SKD_TIMER_SECONDS(6u)
184#define SKD_BUSY_TIMO SKD_TIMER_MINUTES(20u)
185#define SKD_STARTED_BUSY_TIMO SKD_TIMER_SECONDS(60u)
186#define SKD_START_WAIT_SECONDS 90u
187
188enum skd_req_state {
189 SKD_REQ_STATE_IDLE,
190 SKD_REQ_STATE_SETUP,
191 SKD_REQ_STATE_BUSY,
192 SKD_REQ_STATE_COMPLETED,
193 SKD_REQ_STATE_TIMEOUT,
194 SKD_REQ_STATE_ABORTED,
195};
196
197enum skd_fit_msg_state {
198 SKD_MSG_STATE_IDLE,
199 SKD_MSG_STATE_BUSY,
200};
201
202enum skd_check_status_action {
203 SKD_CHECK_STATUS_REPORT_GOOD,
204 SKD_CHECK_STATUS_REPORT_SMART_ALERT,
205 SKD_CHECK_STATUS_REQUEUE_REQUEST,
206 SKD_CHECK_STATUS_REPORT_ERROR,
207 SKD_CHECK_STATUS_BUSY_IMMINENT,
208};
209
210struct skd_fitmsg_context {
211 enum skd_fit_msg_state state;
212
213 struct skd_fitmsg_context *next;
214
215 u32 id;
216 u16 outstanding;
217
218 u32 length;
219 u32 offset;
220
221 u8 *msg_buf;
222 dma_addr_t mb_dma_address;
223};
224
225struct skd_request_context {
226 enum skd_req_state state;
227
228 struct skd_request_context *next;
229
230 u16 id;
231 u32 fitmsg_id;
232
233 struct request *req;
234 struct bio *bio;
235 unsigned long start_time;
236 u8 flush_cmd;
237 u8 discard_page;
238
239 u32 timeout_stamp;
240 u8 sg_data_dir;
241 struct scatterlist *sg;
242 u32 n_sg;
243 u32 sg_byte_count;
244
245 struct fit_sg_descriptor *sksg_list;
246 dma_addr_t sksg_dma_address;
247
248 struct fit_completion_entry_v1 completion;
249
250 struct fit_comp_error_info err_info;
251
252};
253#define SKD_DATA_DIR_HOST_TO_CARD 1
254#define SKD_DATA_DIR_CARD_TO_HOST 2
255#define SKD_DATA_DIR_NONE 3 /* especially for DISCARD requests. */
256
257struct skd_special_context {
258 struct skd_request_context req;
259
260 u8 orphaned;
261
262 void *data_buf;
263 dma_addr_t db_dma_address;
264
265 u8 *msg_buf;
266 dma_addr_t mb_dma_address;
267};
268
269struct skd_sg_io {
270 fmode_t mode;
271 void __user *argp;
272
273 struct sg_io_hdr sg;
274
275 u8 cdb[16];
276
277 u32 dxfer_len;
278 u32 iovcnt;
279 struct sg_iovec *iov;
280 struct sg_iovec no_iov_iov;
281
282 struct skd_special_context *skspcl;
283};
284
285typedef enum skd_irq_type {
286 SKD_IRQ_LEGACY,
287 SKD_IRQ_MSI,
288 SKD_IRQ_MSIX
289} skd_irq_type_t;
290
291#define SKD_MAX_BARS 2
292
293struct skd_device {
294 volatile void __iomem *mem_map[SKD_MAX_BARS];
295 resource_size_t mem_phys[SKD_MAX_BARS];
296 u32 mem_size[SKD_MAX_BARS];
297
298 skd_irq_type_t irq_type;
299 u32 msix_count;
300 struct skd_msix_entry *msix_entries;
301
302 struct pci_dev *pdev;
303 int pcie_error_reporting_is_enabled;
304
305 spinlock_t lock;
306 struct gendisk *disk;
307 struct request_queue *queue;
308 struct device *class_dev;
309 int gendisk_on;
310 int sync_done;
311
312 atomic_t device_count;
313 u32 devno;
314 u32 major;
315 char name[32];
316 char isr_name[30];
317
318 enum skd_drvr_state state;
319 u32 drive_state;
320
321 u32 in_flight;
322 u32 cur_max_queue_depth;
323 u32 queue_low_water_mark;
324 u32 dev_max_queue_depth;
325
326 u32 num_fitmsg_context;
327 u32 num_req_context;
328
329 u32 timeout_slot[SKD_N_TIMEOUT_SLOT];
330 u32 timeout_stamp;
331 struct skd_fitmsg_context *skmsg_free_list;
332 struct skd_fitmsg_context *skmsg_table;
333
334 struct skd_request_context *skreq_free_list;
335 struct skd_request_context *skreq_table;
336
337 struct skd_special_context *skspcl_free_list;
338 struct skd_special_context *skspcl_table;
339
340 struct skd_special_context internal_skspcl;
341 u32 read_cap_blocksize;
342 u32 read_cap_last_lba;
343 int read_cap_is_valid;
344 int inquiry_is_valid;
345 u8 inq_serial_num[13]; /*12 chars plus null term */
346 u8 id_str[80]; /* holds a composite name (pci + sernum) */
347
348 u8 skcomp_cycle;
349 u32 skcomp_ix;
350 struct fit_completion_entry_v1 *skcomp_table;
351 struct fit_comp_error_info *skerr_table;
352 dma_addr_t cq_dma_address;
353
354 wait_queue_head_t waitq;
355
356 struct timer_list timer;
357 u32 timer_countdown;
358 u32 timer_substate;
359
360 int n_special;
361 int sgs_per_request;
362 u32 last_mtd;
363
364 u32 proto_ver;
365
366 int dbg_level;
367 u32 connect_time_stamp;
368 int connect_retries;
369#define SKD_MAX_CONNECT_RETRIES 16
370 u32 drive_jiffies;
371
372 u32 timo_slot;
373
374
375 struct work_struct completion_worker;
376
377 struct bio_list bio_queue;
378 int queue_stopped;
379
380 struct list_head flush_list;
381};
382
383#define SKD_FLUSH_JOB "skd-flush-jobs"
384struct kmem_cache *skd_flush_slab;
385
386/*
387 * These commands hold "nonzero size FLUSH bios",
388 * which are enqueud in skdev->flush_list during
389 * completion of "zero size FLUSH commands".
390 * It will be active in biomode.
391 */
392struct skd_flush_cmd {
393 void *cmd;
394 struct list_head flist;
395};
396
397#define SKD_WRITEL(DEV, VAL, OFF) skd_reg_write32(DEV, VAL, OFF)
398#define SKD_READL(DEV, OFF) skd_reg_read32(DEV, OFF)
399#define SKD_WRITEQ(DEV, VAL, OFF) skd_reg_write64(DEV, VAL, OFF)
400
401static inline u32 skd_reg_read32(struct skd_device *skdev, u32 offset)
402{
403 u32 val;
404
405 if (likely(skdev->dbg_level < 2))
406 return readl(skdev->mem_map[1] + offset);
407 else {
408 barrier();
409 val = readl(skdev->mem_map[1] + offset);
410 barrier();
411 VPRINTK(skdev, "offset %x = %x\n", offset, val);
412 return val;
413 }
414
415}
416
417static inline void skd_reg_write32(struct skd_device *skdev, u32 val,
418 u32 offset)
419{
420 if (likely(skdev->dbg_level < 2)) {
421 writel(val, skdev->mem_map[1] + offset);
422 barrier();
e67f86b3
AB		 423 } else {
424 barrier();
425 writel(val, skdev->mem_map[1] + offset);
426 barrier();
e67f86b3
AB		 427 VPRINTK(skdev, "offset %x = %x\n", offset, val);
428 }
429}
430
431static inline void skd_reg_write64(struct skd_device *skdev, u64 val,
432 u32 offset)
433{
434 if (likely(skdev->dbg_level < 2)) {
435 writeq(val, skdev->mem_map[1] + offset);
436 barrier();
e67f86b3
AB		 437 } else {
438 barrier();
439 writeq(val, skdev->mem_map[1] + offset);
440 barrier();
e67f86b3
AB		 441 VPRINTK(skdev, "offset %x = %016llx\n", offset, val);
442 }
443}
444
445
446#define SKD_IRQ_DEFAULT SKD_IRQ_MSI
447static int skd_isr_type = SKD_IRQ_DEFAULT;
448
449module_param(skd_isr_type, int, 0444);
450MODULE_PARM_DESC(skd_isr_type, "Interrupt type capability."
451 " (0==legacy, 1==MSI, 2==MSI-X, default==1)");
452
453#define SKD_MAX_REQ_PER_MSG_DEFAULT 1
454static int skd_max_req_per_msg = SKD_MAX_REQ_PER_MSG_DEFAULT;
455
456module_param(skd_max_req_per_msg, int, 0444);
457MODULE_PARM_DESC(skd_max_req_per_msg,
458 "Maximum SCSI requests packed in a single message."
459 " (1-14, default==1)");
460
461#define SKD_MAX_QUEUE_DEPTH_DEFAULT 64
462#define SKD_MAX_QUEUE_DEPTH_DEFAULT_STR "64"
463static int skd_max_queue_depth = SKD_MAX_QUEUE_DEPTH_DEFAULT;
464
465module_param(skd_max_queue_depth, int, 0444);
466MODULE_PARM_DESC(skd_max_queue_depth,
467 "Maximum SCSI requests issued to s1120."
468 " (1-200, default==" SKD_MAX_QUEUE_DEPTH_DEFAULT_STR ")");
469
470static int skd_sgs_per_request = SKD_N_SG_PER_REQ_DEFAULT;
471module_param(skd_sgs_per_request, int, 0444);
472MODULE_PARM_DESC(skd_sgs_per_request,
473 "Maximum SG elements per block request."
474 " (1-4096, default==256)");
475
476static int skd_max_pass_thru = SKD_N_SPECIAL_CONTEXT;
477module_param(skd_max_pass_thru, int, 0444);
478MODULE_PARM_DESC(skd_max_pass_thru,
479 "Maximum SCSI pass-thru at a time." " (1-50, default==32)");
480
481module_param(skd_dbg_level, int, 0444);
482MODULE_PARM_DESC(skd_dbg_level, "s1120 debug level (0,1,2)");
483
484module_param(skd_isr_comp_limit, int, 0444);
485MODULE_PARM_DESC(skd_isr_comp_limit, "s1120 isr comp limit (0=none) default=4");
486
487static int skd_bio;
488module_param(skd_bio, int, 0444);
489MODULE_PARM_DESC(skd_bio,
490 "Register as a bio device instead of block (0, 1) default=0");
491
492/* Major device number dynamically assigned. */
493static u32 skd_major;
494
495static struct skd_device *skd_construct(struct pci_dev *pdev);
496static void skd_destruct(struct skd_device *skdev);
497static const struct block_device_operations skd_blockdev_ops;
498static void skd_send_fitmsg(struct skd_device *skdev,
499 struct skd_fitmsg_context *skmsg);
500static void skd_send_special_fitmsg(struct skd_device *skdev,
501 struct skd_special_context *skspcl);
502static void skd_request_fn(struct request_queue *rq);
503static void skd_end_request(struct skd_device *skdev,
504 struct skd_request_context *skreq, int error);
505static int skd_preop_sg_list(struct skd_device *skdev,
506 struct skd_request_context *skreq);
507static void skd_postop_sg_list(struct skd_device *skdev,
508 struct skd_request_context *skreq);
509
510static void skd_restart_device(struct skd_device *skdev);
511static int skd_quiesce_dev(struct skd_device *skdev);
512static int skd_unquiesce_dev(struct skd_device *skdev);
513static void skd_release_special(struct skd_device *skdev,
514 struct skd_special_context *skspcl);
515static void skd_disable_interrupts(struct skd_device *skdev);
516static void skd_isr_fwstate(struct skd_device *skdev);
517static void skd_recover_requests(struct skd_device *skdev, int requeue);
518static void skd_soft_reset(struct skd_device *skdev);
519
520static const char *skd_name(struct skd_device *skdev);
521const char *skd_drive_state_to_str(int state);
522const char *skd_skdev_state_to_str(enum skd_drvr_state state);
523static void skd_log_skdev(struct skd_device *skdev, const char *event);
524static void skd_log_skmsg(struct skd_device *skdev,
525 struct skd_fitmsg_context *skmsg, const char *event);
526static void skd_log_skreq(struct skd_device *skdev,
527 struct skd_request_context *skreq, const char *event);
528
529/* FLUSH FUA flag handling. */
530static int skd_flush_cmd_enqueue(struct skd_device *, void *);
531static void *skd_flush_cmd_dequeue(struct skd_device *);
532
533
534/*
535 *****************************************************************************
536 * READ/WRITE REQUESTS
537 *****************************************************************************
538 */
539static void skd_stop_queue(struct skd_device *skdev)
540{
541 if (!skd_bio)
542 blk_stop_queue(skdev->queue);
543 else
544 skdev->queue_stopped = 1;
545}
546
547static void skd_unstop_queue(struct skd_device *skdev)
548{
549 if (!skd_bio)
550 queue_flag_clear(QUEUE_FLAG_STOPPED, skdev->queue);
551 else
552 skdev->queue_stopped = 0;
553}
554
555static void skd_start_queue(struct skd_device *skdev)
556{
557 if (!skd_bio) {
558 blk_start_queue(skdev->queue);
559 } else {
560 pr_err("(%s): Starting queue\n", skd_name(skdev));
561 skdev->queue_stopped = 0;
562 skd_request_fn(skdev->queue);
563 }
564}
565
566static int skd_queue_stopped(struct skd_device *skdev)
567{
568 if (!skd_bio)
569 return blk_queue_stopped(skdev->queue);
570 else
571 return skdev->queue_stopped;
572}
573
574static void skd_fail_all_pending_blk(struct skd_device *skdev)
575{
576 struct request_queue *q = skdev->queue;
577 struct request *req;
578
579 for (;; ) {
580 req = blk_peek_request(q);
581 if (req == NULL)
582 break;
583 blk_start_request(req);
584 __blk_end_request_all(req, -EIO);
585 }
586}
587
588static void skd_fail_all_pending_bio(struct skd_device *skdev)
589{
590 struct bio *bio;
591 int error = -EIO;
592
593 for (;; ) {
594 bio = bio_list_pop(&skdev->bio_queue);
595
596 if (bio == NULL)
597 break;
598
599 bio_endio(bio, error);
600 }
601}
602
603static void skd_fail_all_pending(struct skd_device *skdev)
604{
605 if (!skd_bio)
606 skd_fail_all_pending_blk(skdev);
607 else
608 skd_fail_all_pending_bio(skdev);
609}
610
611static void skd_make_request(struct request_queue *q, struct bio *bio)
612{
613 struct skd_device *skdev = q->queuedata;
614 unsigned long flags;
615
616 spin_lock_irqsave(&skdev->lock, flags);
617
618 bio_list_add(&skdev->bio_queue, bio);
619 skd_request_fn(skdev->queue);
620
621 spin_unlock_irqrestore(&skdev->lock, flags);
622}
623
624static void
625skd_prep_rw_cdb(struct skd_scsi_request *scsi_req,
626 int data_dir, unsigned lba,
627 unsigned count)
628{
629 if (data_dir == READ)
630 scsi_req->cdb[0] = 0x28;
631 else
632 scsi_req->cdb[0] = 0x2a;
633
634 scsi_req->cdb[1] = 0;
635 scsi_req->cdb[2] = (lba & 0xff000000) >> 24;
636 scsi_req->cdb[3] = (lba & 0xff0000) >> 16;
637 scsi_req->cdb[4] = (lba & 0xff00) >> 8;
638 scsi_req->cdb[5] = (lba & 0xff);
639 scsi_req->cdb[6] = 0;
640 scsi_req->cdb[7] = (count & 0xff00) >> 8;
641 scsi_req->cdb[8] = count & 0xff;
642 scsi_req->cdb[9] = 0;
643}
644
645static void
646skd_prep_zerosize_flush_cdb(struct skd_scsi_request *scsi_req,
647 struct skd_request_context *skreq)
648{
649 skreq->flush_cmd = 1;
650
651 scsi_req->cdb[0] = 0x35;
652 scsi_req->cdb[1] = 0;
653 scsi_req->cdb[2] = 0;
654 scsi_req->cdb[3] = 0;
655 scsi_req->cdb[4] = 0;
656 scsi_req->cdb[5] = 0;
657 scsi_req->cdb[6] = 0;
658 scsi_req->cdb[7] = 0;
659 scsi_req->cdb[8] = 0;
660 scsi_req->cdb[9] = 0;
661}
662
663static void
664skd_prep_discard_cdb(struct skd_scsi_request *scsi_req,
665 struct skd_request_context *skreq,
666 struct page *page,
667 u32 lba, u32 count)
668{
669 char *buf;
670 unsigned long len;
671 struct request *req;
672
673 buf = page_address(page);
674 len = SKD_DISCARD_CDB_LENGTH;
675
676 scsi_req->cdb[0] = UNMAP;
677 scsi_req->cdb[8] = len;
678
679 put_unaligned_be16(6 + 16, &buf[0]);
680 put_unaligned_be16(16, &buf[2]);
681 put_unaligned_be64(lba, &buf[8]);
682 put_unaligned_be32(count, &buf[16]);
683
684 if (!skd_bio) {
685 req = skreq->req;
686 blk_add_request_payload(req, page, len);
687 req->buffer = buf;
688 } else {
689 skreq->bio->bi_io_vec->bv_page = page;
690 skreq->bio->bi_io_vec->bv_offset = 0;
691 skreq->bio->bi_io_vec->bv_len = len;
692
693 skreq->bio->bi_vcnt = 1;
694 skreq->bio->bi_phys_segments = 1;
695 }
696}
697
698static void skd_request_fn_not_online(struct request_queue *q);
699
700static void skd_request_fn(struct request_queue *q)
701{
702 struct skd_device *skdev = q->queuedata;
703 struct skd_fitmsg_context *skmsg = NULL;
704 struct fit_msg_hdr *fmh = NULL;
705 struct skd_request_context *skreq;
706 struct request *req = NULL;
707 struct bio *bio = NULL;
708 struct skd_scsi_request *scsi_req;
709 struct page *page;
710 unsigned long io_flags;
711 int error;
712 u32 lba;
713 u32 count;
714 int data_dir;
715 u32 be_lba;
716 u32 be_count;
717 u64 be_dmaa;
718 u64 cmdctxt;
719 u32 timo_slot;
720 void *cmd_ptr;
721 int flush, fua;
722
723 if (skdev->state != SKD_DRVR_STATE_ONLINE) {
724 skd_request_fn_not_online(q);
725 return;
726 }
727
728 if (skd_queue_stopped(skdev)) {
729 if (skdev->skmsg_free_list == NULL ||
730 skdev->skreq_free_list == NULL ||
731 skdev->in_flight >= skdev->queue_low_water_mark)
732 /* There is still some kind of shortage */
733 return;
734
735 skd_unstop_queue(skdev);
736 }
737
738 /*
739 * Stop conditions:
740 * - There are no more native requests
741 * - There are already the maximum number of requests in progress
742 * - There are no more skd_request_context entries
743 * - There are no more FIT msg buffers
744 */
745 for (;; ) {
746
747 flush = fua = 0;
748
749 if (!skd_bio) {
750 req = blk_peek_request(q);
751
752 /* Are there any native requests to start? */
753 if (req == NULL)
754 break;
755
756 lba = (u32)blk_rq_pos(req);
757 count = blk_rq_sectors(req);
758 data_dir = rq_data_dir(req);
759 io_flags = req->cmd_flags;
760
761 if (io_flags & REQ_FLUSH)
762 flush++;
763
764 if (io_flags & REQ_FUA)
765 fua++;
766
767 VPRINTK(skdev,
768 "new req=%p lba=%u(0x%x) count=%u(0x%x) dir=%d\n",
769 req, lba, lba, count, count, data_dir);
770 } else {
771 if (!list_empty(&skdev->flush_list)) {
772 /* Process data part of FLUSH request. */
773 bio = (struct bio *)skd_flush_cmd_dequeue(skdev);
774 flush++;
775 VPRINTK(skdev, "processing FLUSH request with data.\n");
776 } else {
777 /* peek at our bio queue */
778 bio = bio_list_peek(&skdev->bio_queue);
779 }
780
781 /* Are there any native requests to start? */
782 if (bio == NULL)
783 break;
784
785 lba = (u32)bio->bi_sector;
786 count = bio_sectors(bio);
787 data_dir = bio_data_dir(bio);
788 io_flags = bio->bi_rw;
789
790 VPRINTK(skdev,
791 "new bio=%p lba=%u(0x%x) count=%u(0x%x) dir=%d\n",
792 bio, lba, lba, count, count, data_dir);
793
794 if (io_flags & REQ_FLUSH)
795 flush++;
796
797 if (io_flags & REQ_FUA)
798 fua++;
799 }
800
801 /* At this point we know there is a request
802 * (from our bio q or req q depending on the way
803 * the driver is built do checks for resources.
804 */
805
806 /* Are too many requets already in progress? */
807 if (skdev->in_flight >= skdev->cur_max_queue_depth) {
808 VPRINTK(skdev, "qdepth %d, limit %d\n",
809 skdev->in_flight, skdev->cur_max_queue_depth);
810 break;
811 }
812
813 /* Is a skd_request_context available? */
814 skreq = skdev->skreq_free_list;
815 if (skreq == NULL) {
816 VPRINTK(skdev, "Out of req=%p\n", q);
817 break;
818 }
819 SKD_ASSERT(skreq->state == SKD_REQ_STATE_IDLE);
820 SKD_ASSERT((skreq->id & SKD_ID_INCR) == 0);
821
822 /* Now we check to see if we can get a fit msg */
823 if (skmsg == NULL) {
824 if (skdev->skmsg_free_list == NULL) {
825 VPRINTK(skdev, "Out of msg\n");
826 break;
827 }
828 }
829
830 skreq->flush_cmd = 0;
831 skreq->n_sg = 0;
832 skreq->sg_byte_count = 0;
833 skreq->discard_page = 0;
834
835 /*
836 * OK to now dequeue request from either bio or q.
837 *
838 * At this point we are comitted to either start or reject
839 * the native request. Note that skd_request_context is
840 * available but is still at the head of the free list.
841 */
842 if (!skd_bio) {
843 blk_start_request(req);
844 skreq->req = req;
845 skreq->fitmsg_id = 0;
846 } else {
847 if (unlikely(flush == SKD_FLUSH_DATA_SECOND)) {
848 skreq->bio = bio;
849 } else {
850 skreq->bio = bio_list_pop(&skdev->bio_queue);
851 SKD_ASSERT(skreq->bio == bio);
852 skreq->start_time = jiffies;
853 part_inc_in_flight(&skdev->disk->part0,
854 bio_data_dir(bio));
855 }
856
857 skreq->fitmsg_id = 0;
858 }
859
860 /* Either a FIT msg is in progress or we have to start one. */
861 if (skmsg == NULL) {
862 /* Are there any FIT msg buffers available? */
863 skmsg = skdev->skmsg_free_list;
864 if (skmsg == NULL) {
865 VPRINTK(skdev, "Out of msg skdev=%p\n", skdev);
866 break;
867 }
868 SKD_ASSERT(skmsg->state == SKD_MSG_STATE_IDLE);
869 SKD_ASSERT((skmsg->id & SKD_ID_INCR) == 0);
870
871 skdev->skmsg_free_list = skmsg->next;
872
873 skmsg->state = SKD_MSG_STATE_BUSY;
874 skmsg->id += SKD_ID_INCR;
875
876 /* Initialize the FIT msg header */
877 fmh = (struct fit_msg_hdr *)skmsg->msg_buf;
878 memset(fmh, 0, sizeof(*fmh));
879 fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT;
880 skmsg->length = sizeof(*fmh);
881 }
882
883 skreq->fitmsg_id = skmsg->id;
884
885 /*
886 * Note that a FIT msg may have just been started
887 * but contains no SoFIT requests yet.
888 */
889
890 /*
891 * Transcode the request, checking as we go. The outcome of
892 * the transcoding is represented by the error variable.
893 */
894 cmd_ptr = &skmsg->msg_buf[skmsg->length];
895 memset(cmd_ptr, 0, 32);
896
897 be_lba = cpu_to_be32(lba);
898 be_count = cpu_to_be32(count);
899 be_dmaa = cpu_to_be64((u64)skreq->sksg_dma_address);
900 cmdctxt = skreq->id + SKD_ID_INCR;
901
902 scsi_req = cmd_ptr;
903 scsi_req->hdr.tag = cmdctxt;
904 scsi_req->hdr.sg_list_dma_address = be_dmaa;
905
906 if (data_dir == READ)
907 skreq->sg_data_dir = SKD_DATA_DIR_CARD_TO_HOST;
908 else
909 skreq->sg_data_dir = SKD_DATA_DIR_HOST_TO_CARD;
910
911 if (io_flags & REQ_DISCARD) {
912 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
913 if (!page) {
914 pr_err("request_fn:Page allocation failed.\n");
915 skd_end_request(skdev, skreq, -ENOMEM);
916 break;
917 }
918 skreq->discard_page = 1;
919 skd_prep_discard_cdb(scsi_req, skreq, page, lba, count);
920
921 } else if (flush == SKD_FLUSH_ZERO_SIZE_FIRST) {
922 skd_prep_zerosize_flush_cdb(scsi_req, skreq);
923 SKD_ASSERT(skreq->flush_cmd == 1);
924
925 } else {
926 skd_prep_rw_cdb(scsi_req, data_dir, lba, count);
927 }
928
929 if (fua)
930 scsi_req->cdb[1] |= SKD_FUA_NV;
931
932 if ((!skd_bio && !req->bio) ||
933 (skd_bio && flush == SKD_FLUSH_ZERO_SIZE_FIRST))
934 goto skip_sg;
935
936 error = skd_preop_sg_list(skdev, skreq);
937
938 if (error != 0) {
939 /*
940 * Complete the native request with error.
941 * Note that the request context is still at the
942 * head of the free list, and that the SoFIT request
943 * was encoded into the FIT msg buffer but the FIT
944 * msg length has not been updated. In short, the
945 * only resource that has been allocated but might
946 * not be used is that the FIT msg could be empty.
947 */
948 DPRINTK(skdev, "error Out\n");
949 skd_end_request(skdev, skreq, error);
950 continue;
951 }
952
953skip_sg:
954 scsi_req->hdr.sg_list_len_bytes =
955 cpu_to_be32(skreq->sg_byte_count);
956
957 /* Complete resource allocations. */
958 skdev->skreq_free_list = skreq->next;
959 skreq->state = SKD_REQ_STATE_BUSY;
960 skreq->id += SKD_ID_INCR;
961
962 skmsg->length += sizeof(struct skd_scsi_request);
963 fmh->num_protocol_cmds_coalesced++;
964
965 /*
966 * Update the active request counts.
967 * Capture the timeout timestamp.
968 */
969 skreq->timeout_stamp = skdev->timeout_stamp;
970 timo_slot = skreq->timeout_stamp & SKD_TIMEOUT_SLOT_MASK;
971 skdev->timeout_slot[timo_slot]++;
972 skdev->in_flight++;
973 VPRINTK(skdev, "req=0x%x busy=%d\n",
974 skreq->id, skdev->in_flight);
975
976 /*
977 * If the FIT msg buffer is full send it.
978 */
979 if (skmsg->length >= SKD_N_FITMSG_BYTES ||
980 fmh->num_protocol_cmds_coalesced >= skd_max_req_per_msg) {
981 skd_send_fitmsg(skdev, skmsg);
982 skmsg = NULL;
983 fmh = NULL;
984 }
985 }
986
987 /*
988 * Is a FIT msg in progress? If it is empty put the buffer back
989 * on the free list. If it is non-empty send what we got.
990 * This minimizes latency when there are fewer requests than
991 * what fits in a FIT msg.
992 */
993 if (skmsg != NULL) {
994 /* Bigger than just a FIT msg header? */
995 if (skmsg->length > sizeof(struct fit_msg_hdr)) {
996 VPRINTK(skdev, "sending msg=%p, len %d\n",
997 skmsg, skmsg->length);
998 skd_send_fitmsg(skdev, skmsg);
999 } else {
1000 /*
1001 * The FIT msg is empty. It means we got started
1002 * on the msg, but the requests were rejected.
1003 */
1004 skmsg->state = SKD_MSG_STATE_IDLE;
1005 skmsg->id += SKD_ID_INCR;
1006 skmsg->next = skdev->skmsg_free_list;
1007 skdev->skmsg_free_list = skmsg;
1008 }
1009 skmsg = NULL;
1010 fmh = NULL;
1011 }
1012
1013 /*
1014 * If req is non-NULL it means there is something to do but
1015 * we are out of a resource.
1016 */
1017 if (((!skd_bio) && req) ||
1018 ((skd_bio) && bio_list_peek(&skdev->bio_queue)))
1019 skd_stop_queue(skdev);
1020}
1021
1022static void skd_end_request_blk(struct skd_device *skdev,
1023 struct skd_request_context *skreq, int error)
1024{
1025 struct request *req = skreq->req;
1026 unsigned int io_flags = req->cmd_flags;
1027
1028 if ((io_flags & REQ_DISCARD) &&
1029 (skreq->discard_page == 1)) {
1030 VPRINTK(skdev, "skd_end_request_blk, free the page!");
1031 free_page((unsigned long)req->buffer);
1032 req->buffer = NULL;
1033 }
1034
1035 if (unlikely(error)) {
1036 struct request *req = skreq->req;
1037 char *cmd = (rq_data_dir(req) == READ) ? "read" : "write";
1038 u32 lba = (u32)blk_rq_pos(req);
1039 u32 count = blk_rq_sectors(req);
1040
1041 pr_err("(%s): Error cmd=%s sect=%u count=%u id=0x%x\n",
1042 skd_name(skdev), cmd, lba, count, skreq->id);
1043 } else
1044 VPRINTK(skdev, "id=0x%x error=%d\n", skreq->id, error);
1045
1046 __blk_end_request_all(skreq->req, error);
1047}
1048
1049static int skd_preop_sg_list_blk(struct skd_device *skdev,
1050 struct skd_request_context *skreq)
1051{
1052 struct request *req = skreq->req;
1053 int writing = skreq->sg_data_dir == SKD_DATA_DIR_HOST_TO_CARD;
1054 int pci_dir = writing ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE;
1055 struct scatterlist *sg = &skreq->sg[0];
1056 int n_sg;
1057 int i;
1058
1059 skreq->sg_byte_count = 0;
1060
1061 /* SKD_ASSERT(skreq->sg_data_dir == SKD_DATA_DIR_HOST_TO_CARD ||
1062 skreq->sg_data_dir == SKD_DATA_DIR_CARD_TO_HOST); */
1063
1064 n_sg = blk_rq_map_sg(skdev->queue, req, sg);
1065 if (n_sg <= 0)
1066 return -EINVAL;
1067
1068 /*
1069 * Map scatterlist to PCI bus addresses.
1070 * Note PCI might change the number of entries.
1071 */
1072 n_sg = pci_map_sg(skdev->pdev, sg, n_sg, pci_dir);
1073 if (n_sg <= 0)
1074 return -EINVAL;
1075
1076 SKD_ASSERT(n_sg <= skdev->sgs_per_request);
1077
1078 skreq->n_sg = n_sg;
1079
1080 for (i = 0; i < n_sg; i++) {
1081 struct fit_sg_descriptor *sgd = &skreq->sksg_list[i];
1082 u32 cnt = sg_dma_len(&sg[i]);
1083 uint64_t dma_addr = sg_dma_address(&sg[i]);
1084
1085 sgd->control = FIT_SGD_CONTROL_NOT_LAST;
1086 sgd->byte_count = cnt;
1087 skreq->sg_byte_count += cnt;
1088 sgd->host_side_addr = dma_addr;
1089 sgd->dev_side_addr = 0;
1090 }
1091
1092 skreq->sksg_list[n_sg - 1].next_desc_ptr = 0LL;
1093 skreq->sksg_list[n_sg - 1].control = FIT_SGD_CONTROL_LAST;
1094
1095 if (unlikely(skdev->dbg_level > 1)) {
1096 VPRINTK(skdev, "skreq=%x sksg_list=%p sksg_dma=%llx\n",
1097 skreq->id, skreq->sksg_list, skreq->sksg_dma_address);
1098 for (i = 0; i < n_sg; i++) {
1099 struct fit_sg_descriptor *sgd = &skreq->sksg_list[i];
1100 VPRINTK(skdev, " sg[%d] count=%u ctrl=0x%x "
1101 "addr=0x%llx next=0x%llx\n",
1102 i, sgd->byte_count, sgd->control,
1103 sgd->host_side_addr, sgd->next_desc_ptr);
1104 }
1105 }
1106
1107 return 0;
1108}
1109
1110static void skd_postop_sg_list_blk(struct skd_device *skdev,
1111 struct skd_request_context *skreq)
1112{
1113 int writing = skreq->sg_data_dir == SKD_DATA_DIR_HOST_TO_CARD;
1114 int pci_dir = writing ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE;
1115
1116 /*
1117 * restore the next ptr for next IO request so we
1118 * don't have to set it every time.
1119 */
1120 skreq->sksg_list[skreq->n_sg - 1].next_desc_ptr =
1121 skreq->sksg_dma_address +
1122 ((skreq->n_sg) * sizeof(struct fit_sg_descriptor));
1123 pci_unmap_sg(skdev->pdev, &skreq->sg[0], skreq->n_sg, pci_dir);
1124}
1125
1126static void skd_end_request_bio(struct skd_device *skdev,
1127 struct skd_request_context *skreq, int error)
1128{
1129 struct bio *bio = skreq->bio;
1130 int rw = bio_data_dir(bio);
1131 unsigned long io_flags = bio->bi_rw;
1132
1133 if ((io_flags & REQ_DISCARD) &&
1134 (skreq->discard_page == 1)) {
1135 VPRINTK(skdev, "biomode: skd_end_request: freeing DISCARD page.\n");
1136 free_page((unsigned long)page_address(bio->bi_io_vec->bv_page));
1137 }
1138
1139 if (unlikely(error)) {
1140 u32 lba = (u32)skreq->bio->bi_sector;
1141 u32 count = bio_sectors(skreq->bio);
1142 char *cmd = (rw == WRITE) ? "write" : "read";
1143 pr_err("(%s): Error cmd=%s sect=%u count=%u id=0x%x\n",
1144 skd_name(skdev), cmd, lba, count, skreq->id);
1145 }
1146 {
1147 int cpu = part_stat_lock();
1148
1149 if (likely(!error)) {
1150 part_stat_inc(cpu, &skdev->disk->part0, ios[rw]);
1151 part_stat_add(cpu, &skdev->disk->part0, sectors[rw],
1152 bio_sectors(bio));
1153 }
1154 part_stat_add(cpu, &skdev->disk->part0, ticks[rw],
1155 jiffies - skreq->start_time);
1156 part_dec_in_flight(&skdev->disk->part0, rw);
1157 part_stat_unlock();
1158 }
1159
1160 VPRINTK(skdev, "id=0x%x error=%d\n", skreq->id, error);
1161
1162 bio_endio(skreq->bio, error);
1163}
1164
1165static int skd_preop_sg_list_bio(struct skd_device *skdev,
1166 struct skd_request_context *skreq)
1167{
1168 struct bio *bio = skreq->bio;
1169 int writing = skreq->sg_data_dir == SKD_DATA_DIR_HOST_TO_CARD;
1170 int pci_dir = writing ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE;
1171 int n_sg;
1172 int i;
1173 struct bio_vec *vec;
1174 struct fit_sg_descriptor *sgd;
1175 u64 dma_addr;
1176 u32 count;
1177 int errs = 0;
1178 unsigned int io_flags = 0;
1179 io_flags |= bio->bi_rw;
1180
1181 skreq->sg_byte_count = 0;
1182 n_sg = skreq->n_sg = skreq->bio->bi_vcnt;
1183
1184 if (n_sg <= 0)
1185 return -EINVAL;
1186
1187 if (n_sg > skdev->sgs_per_request) {
1188 pr_err("(%s): sg overflow n=%d\n",
1189 skd_name(skdev), n_sg);
1190 skreq->n_sg = 0;
1191 return -EIO;
1192 }
1193
1194 for (i = 0; i < skreq->n_sg; i++) {
1195 vec = bio_iovec_idx(bio, i);
1196 dma_addr = pci_map_page(skdev->pdev,
1197 vec->bv_page,
1198 vec->bv_offset, vec->bv_len, pci_dir);
1199 count = vec->bv_len;
1200
1201 if (count == 0 || count > 64u * 1024u || (count & 3) != 0
1202 || (dma_addr & 3) != 0) {
1203 pr_err(
1204 "(%s): Bad sg ix=%d count=%d addr=0x%llx\n",
1205 skd_name(skdev), i, count, dma_addr);
1206 errs++;
1207 }
1208
1209 sgd = &skreq->sksg_list[i];
1210
1211 sgd->control = FIT_SGD_CONTROL_NOT_LAST;
1212 sgd->byte_count = vec->bv_len;
1213 skreq->sg_byte_count += vec->bv_len;
1214 sgd->host_side_addr = dma_addr;
1215 sgd->dev_side_addr = 0; /* not used */
1216 }
1217
1218 skreq->sksg_list[n_sg - 1].next_desc_ptr = 0LL;
1219 skreq->sksg_list[n_sg - 1].control = FIT_SGD_CONTROL_LAST;
1220
1221
1222 if (!(io_flags & REQ_DISCARD)) {
1223 count = bio_sectors(bio) << 9u;
1224 if (count != skreq->sg_byte_count) {
1225 pr_err("(%s): mismatch count sg=%d req=%d\n",
1226 skd_name(skdev), skreq->sg_byte_count, count);
1227 errs++;
1228 }
1229 }
1230
1231 if (unlikely(skdev->dbg_level > 1)) {
1232 VPRINTK(skdev, "skreq=%x sksg_list=%p sksg_dma=%llx\n",
1233 skreq->id, skreq->sksg_list, skreq->sksg_dma_address);
1234 for (i = 0; i < n_sg; i++) {
1235 struct fit_sg_descriptor *sgd = &skreq->sksg_list[i];
1236 VPRINTK(skdev, " sg[%d] count=%u ctrl=0x%x "
1237 "addr=0x%llx next=0x%llx\n",
1238 i, sgd->byte_count, sgd->control,
1239 sgd->host_side_addr, sgd->next_desc_ptr);
1240 }
1241 }
1242
1243 if (errs != 0) {
1244 skd_postop_sg_list(skdev, skreq);
1245 skreq->n_sg = 0;
1246 return -EIO;
1247 }
1248
1249 return 0;
1250}
1251
1252static int skd_preop_sg_list(struct skd_device *skdev,
1253 struct skd_request_context *skreq)
1254{
1255 if (!skd_bio)
1256 return skd_preop_sg_list_blk(skdev, skreq);
1257 else
1258 return skd_preop_sg_list_bio(skdev, skreq);
1259}
1260
1261static void skd_postop_sg_list_bio(struct skd_device *skdev,
1262 struct skd_request_context *skreq)
1263{
1264 int writing = skreq->sg_data_dir == SKD_DATA_DIR_HOST_TO_CARD;
1265 int pci_dir = writing ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE;
1266 int i;
1267 struct fit_sg_descriptor *sgd;
1268
1269 /*
1270 * restore the next ptr for next IO request so we
1271 * don't have to set it every time.
1272 */
1273 skreq->sksg_list[skreq->n_sg - 1].next_desc_ptr =
1274 skreq->sksg_dma_address +
1275 ((skreq->n_sg) * sizeof(struct fit_sg_descriptor));
1276
1277 for (i = 0; i < skreq->n_sg; i++) {
1278 sgd = &skreq->sksg_list[i];
1279 pci_unmap_page(skdev->pdev, sgd->host_side_addr,
1280 sgd->byte_count, pci_dir);
1281 }
1282}
1283
1284static void skd_postop_sg_list(struct skd_device *skdev,
1285 struct skd_request_context *skreq)
1286{
1287 if (!skd_bio)
1288 skd_postop_sg_list_blk(skdev, skreq);
1289 else
1290 skd_postop_sg_list_bio(skdev, skreq);
1291}
1292
1293static void skd_end_request(struct skd_device *skdev,
1294 struct skd_request_context *skreq, int error)
1295{
1296 if (likely(!skd_bio))
1297 skd_end_request_blk(skdev, skreq, error);
1298 else
1299 skd_end_request_bio(skdev, skreq, error);
1300}
1301
1302static void skd_request_fn_not_online(struct request_queue *q)
1303{
1304 struct skd_device *skdev = q->queuedata;
1305 int error;
1306
1307 SKD_ASSERT(skdev->state != SKD_DRVR_STATE_ONLINE);
1308
1309 skd_log_skdev(skdev, "req_not_online");
1310 switch (skdev->state) {
1311 case SKD_DRVR_STATE_PAUSING:
1312 case SKD_DRVR_STATE_PAUSED:
1313 case SKD_DRVR_STATE_STARTING:
1314 case SKD_DRVR_STATE_RESTARTING:
1315 case SKD_DRVR_STATE_WAIT_BOOT:
1316 /* In case of starting, we haven't started the queue,
1317 * so we can't get here... but requests are
1318 * possibly hanging out waiting for us because we
1319 * reported the dev/skd0 already. They'll wait
1320 * forever if connect doesn't complete.
1321 * What to do??? delay dev/skd0 ??
1322 */
1323 case SKD_DRVR_STATE_BUSY:
1324 case SKD_DRVR_STATE_BUSY_IMMINENT:
1325 case SKD_DRVR_STATE_BUSY_ERASE:
1326 case SKD_DRVR_STATE_DRAINING_TIMEOUT:
1327 return;
1328
1329 case SKD_DRVR_STATE_BUSY_SANITIZE:
1330 case SKD_DRVR_STATE_STOPPING:
1331 case SKD_DRVR_STATE_SYNCING:
1332 case SKD_DRVR_STATE_FAULT:
1333 case SKD_DRVR_STATE_DISAPPEARED:
1334 default:
1335 error = -EIO;
1336 break;
1337 }
1338
1339 /* If we get here, terminate all pending block requeusts
1340 * with EIO and any scsi pass thru with appropriate sense
1341 */
1342
1343 skd_fail_all_pending(skdev);
1344}
1345
1346/*
1347 *****************************************************************************
1348 * TIMER
1349 *****************************************************************************
1350 */
1351
1352static void skd_timer_tick_not_online(struct skd_device *skdev);
1353
1354static void skd_timer_tick(ulong arg)
1355{
1356 struct skd_device *skdev = (struct skd_device *)arg;
1357
1358 u32 timo_slot;
1359 u32 overdue_timestamp;
1360 unsigned long reqflags;
1361 u32 state;
1362
1363 if (skdev->state == SKD_DRVR_STATE_FAULT)
1364 /* The driver has declared fault, and we want it to
1365 * stay that way until driver is reloaded.
1366 */
1367 return;
1368
1369 spin_lock_irqsave(&skdev->lock, reqflags);
1370
1371 state = SKD_READL(skdev, FIT_STATUS);
1372 state &= FIT_SR_DRIVE_STATE_MASK;
1373 if (state != skdev->drive_state)
1374 skd_isr_fwstate(skdev);
1375
1376 if (skdev->state != SKD_DRVR_STATE_ONLINE) {
1377 skd_timer_tick_not_online(skdev);
1378 goto timer_func_out;
1379 }
1380 skdev->timeout_stamp++;
1381 timo_slot = skdev->timeout_stamp & SKD_TIMEOUT_SLOT_MASK;
1382
1383 /*
1384 * All requests that happened during the previous use of
1385 * this slot should be done by now. The previous use was
1386 * over 7 seconds ago.
1387 */
1388 if (skdev->timeout_slot[timo_slot] == 0)
1389 goto timer_func_out;
1390
1391 /* Something is overdue */
1392 overdue_timestamp = skdev->timeout_stamp - SKD_N_TIMEOUT_SLOT;
1393
1394 DPRINTK(skdev, "found %d timeouts, draining busy=%d\n",
1395 skdev->timeout_slot[timo_slot], skdev->in_flight);
1396 pr_err("(%s): Overdue IOs (%d), busy %d\n",
1397 skd_name(skdev), skdev->timeout_slot[timo_slot],
1398 skdev->in_flight);
1399
1400 skdev->timer_countdown = SKD_DRAINING_TIMO;
1401 skdev->state = SKD_DRVR_STATE_DRAINING_TIMEOUT;
1402 skdev->timo_slot = timo_slot;
1403 skd_stop_queue(skdev);
1404
1405timer_func_out:
1406 mod_timer(&skdev->timer, (jiffies + HZ));
1407
1408 spin_unlock_irqrestore(&skdev->lock, reqflags);
1409}
1410
1411static void skd_timer_tick_not_online(struct skd_device *skdev)
1412{
1413 switch (skdev->state) {
1414 case SKD_DRVR_STATE_IDLE:
1415 case SKD_DRVR_STATE_LOAD:
1416 break;
1417 case SKD_DRVR_STATE_BUSY_SANITIZE:
1418 VPRINTK(skdev, "drive busy sanitize[%x], driver[%x]\n",
1419 skdev->drive_state, skdev->state);
1420 /* If we've been in sanitize for 3 seconds, we figure we're not
1421 * going to get anymore completions, so recover requests now
1422 */
1423 if (skdev->timer_countdown > 0) {
1424 skdev->timer_countdown--;
1425 return;
1426 }
1427 skd_recover_requests(skdev, 0);
1428 break;
1429
1430 case SKD_DRVR_STATE_BUSY:
1431 case SKD_DRVR_STATE_BUSY_IMMINENT:
1432 case SKD_DRVR_STATE_BUSY_ERASE:
1433 VPRINTK(skdev, "busy[%x], countdown=%d\n",
1434 skdev->state, skdev->timer_countdown);
1435 if (skdev->timer_countdown > 0) {
1436 skdev->timer_countdown--;
1437 return;
1438 }
1439 DPRINTK(skdev, "busy[%x], timedout=%d, restarting device.",
1440 skdev->state, skdev->timer_countdown);
1441 skd_restart_device(skdev);
1442 break;
1443
1444 case SKD_DRVR_STATE_WAIT_BOOT:
1445 case SKD_DRVR_STATE_STARTING:
1446 if (skdev->timer_countdown > 0) {
1447 skdev->timer_countdown--;
1448 return;
1449 }
1450 /* For now, we fault the drive. Could attempt resets to
1451 * revcover at some point. */
1452 skdev->state = SKD_DRVR_STATE_FAULT;
1453
1454 pr_err("(%s): DriveFault Connect Timeout (%x)\n",
1455 skd_name(skdev), skdev->drive_state);
1456
1457 /*start the queue so we can respond with error to requests */
1458 /* wakeup anyone waiting for startup complete */
1459 skd_start_queue(skdev);
1460 skdev->gendisk_on = -1;
1461 wake_up_interruptible(&skdev->waitq);
1462 break;
1463
1464 case SKD_DRVR_STATE_ONLINE:
1465 /* shouldn't get here. */
1466 break;
1467
1468 case SKD_DRVR_STATE_PAUSING:
1469 case SKD_DRVR_STATE_PAUSED:
1470 break;
1471
1472 case SKD_DRVR_STATE_DRAINING_TIMEOUT:
1473 DPRINTK(skdev,
1474 "draining busy [%d] tick[%d] qdb[%d] tmls[%d]\n",
1475 skdev->timo_slot,
1476 skdev->timer_countdown,
1477 skdev->in_flight,
1478 skdev->timeout_slot[skdev->timo_slot]);
1479 /* if the slot has cleared we can let the I/O continue */
1480 if (skdev->timeout_slot[skdev->timo_slot] == 0) {
1481 DPRINTK(skdev, "Slot drained, starting queue.\n");
1482 skdev->state = SKD_DRVR_STATE_ONLINE;
1483 skd_start_queue(skdev);
1484 return;
1485 }
1486 if (skdev->timer_countdown > 0) {
1487 skdev->timer_countdown--;
1488 return;
1489 }
1490 skd_restart_device(skdev);
1491 break;
1492
1493 case SKD_DRVR_STATE_RESTARTING:
1494 if (skdev->timer_countdown > 0) {
1495 skdev->timer_countdown--;
1496 return;
1497 }
1498 /* For now, we fault the drive. Could attempt resets to
1499 * revcover at some point. */
1500 skdev->state = SKD_DRVR_STATE_FAULT;
1501 pr_err("(%s): DriveFault Reconnect Timeout (%x)\n",
1502 skd_name(skdev), skdev->drive_state);
1503
1504 /*
1505 * Recovering does two things:
1506 * 1. completes IO with error
1507 * 2. reclaims dma resources
1508 * When is it safe to recover requests?
1509 * - if the drive state is faulted
1510 * - if the state is still soft reset after out timeout
1511 * - if the drive registers are dead (state = FF)
1512 * If it is "unsafe", we still need to recover, so we will
1513 * disable pci bus mastering and disable our interrupts.
1514 */
1515
1516 if ((skdev->drive_state == FIT_SR_DRIVE_SOFT_RESET) ||
1517 (skdev->drive_state == FIT_SR_DRIVE_FAULT) ||
1518 (skdev->drive_state == FIT_SR_DRIVE_STATE_MASK))
1519 /* It never came out of soft reset. Try to
1520 * recover the requests and then let them
1521 * fail. This is to mitigate hung processes. */
1522 skd_recover_requests(skdev, 0);
1523 else {
1524 pr_err("(%s): Disable BusMaster (%x)\n",
1525 skd_name(skdev), skdev->drive_state);
1526 pci_disable_device(skdev->pdev);
1527 skd_disable_interrupts(skdev);
1528 skd_recover_requests(skdev, 0);
1529 }
1530
1531 /*start the queue so we can respond with error to requests */
1532 /* wakeup anyone waiting for startup complete */
1533 skd_start_queue(skdev);
1534 skdev->gendisk_on = -1;
1535 wake_up_interruptible(&skdev->waitq);
1536 break;
1537
1538 case SKD_DRVR_STATE_RESUMING:
1539 case SKD_DRVR_STATE_STOPPING:
1540 case SKD_DRVR_STATE_SYNCING:
1541 case SKD_DRVR_STATE_FAULT:
1542 case SKD_DRVR_STATE_DISAPPEARED:
1543 default:
1544 break;
1545 }
1546}
1547
1548static int skd_start_timer(struct skd_device *skdev)
1549{
1550 int rc;
1551
1552 init_timer(&skdev->timer);
1553 setup_timer(&skdev->timer, skd_timer_tick, (ulong)skdev);
1554
1555 rc = mod_timer(&skdev->timer, (jiffies + HZ));
1556 if (rc)
1557 pr_err("%s: failed to start timer %d\n",
1558 __func__, rc);
1559 return rc;
1560}
1561
1562static void skd_kill_timer(struct skd_device *skdev)
1563{
1564 del_timer_sync(&skdev->timer);
1565}
1566
1567/*
1568 *****************************************************************************
1569 * IOCTL
1570 *****************************************************************************
1571 */
1572static int skd_ioctl_sg_io(struct skd_device *skdev,
1573 fmode_t mode, void __user *argp);
1574static int skd_sg_io_get_and_check_args(struct skd_device *skdev,
1575 struct skd_sg_io *sksgio);
1576static int skd_sg_io_obtain_skspcl(struct skd_device *skdev,
1577 struct skd_sg_io *sksgio);
1578static int skd_sg_io_prep_buffering(struct skd_device *skdev,
1579 struct skd_sg_io *sksgio);
1580static int skd_sg_io_copy_buffer(struct skd_device *skdev,
1581 struct skd_sg_io *sksgio, int dxfer_dir);
1582static int skd_sg_io_send_fitmsg(struct skd_device *skdev,
1583 struct skd_sg_io *sksgio);
1584static int skd_sg_io_await(struct skd_device *skdev, struct skd_sg_io *sksgio);
1585static int skd_sg_io_release_skspcl(struct skd_device *skdev,
1586 struct skd_sg_io *sksgio);
1587static int skd_sg_io_put_status(struct skd_device *skdev,
1588 struct skd_sg_io *sksgio);
1589
1590static void skd_complete_special(struct skd_device *skdev,
1591 volatile struct fit_completion_entry_v1
1592 *skcomp,
1593 volatile struct fit_comp_error_info *skerr,
1594 struct skd_special_context *skspcl);
1595
1596static int skd_bdev_ioctl(struct block_device *bdev, fmode_t mode,
1597 uint cmd_in, ulong arg)
1598{
1599 int rc = 0;
1600 struct gendisk *disk = bdev->bd_disk;
1601 struct skd_device *skdev = disk->private_data;
1602 void __user *p = (void *)arg;
1603
1604 DPRINTK(skdev, "%s: CMD[%s] ioctl mode 0x%x, cmd 0x%x arg %0lx\n",
1605 disk->disk_name, current->comm, mode, cmd_in, arg);
1606
1607 if (!capable(CAP_SYS_ADMIN))
1608 return -EPERM;
1609
1610 switch (cmd_in) {
1611 case SG_SET_TIMEOUT:
1612 case SG_GET_TIMEOUT:
1613 case SG_GET_VERSION_NUM:
1614 rc = scsi_cmd_ioctl(disk->queue, disk, mode, cmd_in, p);
1615 break;
1616 case SG_IO:
1617 rc = skd_ioctl_sg_io(skdev, mode, p);
1618 break;
1619
1620 default:
1621 rc = -ENOTTY;
1622 break;
1623 }
1624
1625 DPRINTK(skdev, "%s: completion rc %d\n", disk->disk_name, rc);
1626 return rc;
1627}
1628
1629static int skd_ioctl_sg_io(struct skd_device *skdev, fmode_t mode,
1630 void __user *argp)
1631{
1632 int rc;
1633 struct skd_sg_io sksgio;
1634
1635 memset(&sksgio, 0, sizeof(sksgio));
1636 sksgio.mode = mode;
1637 sksgio.argp = argp;
1638 sksgio.iov = &sksgio.no_iov_iov;
1639
1640 switch (skdev->state) {
1641 case SKD_DRVR_STATE_ONLINE:
1642 case SKD_DRVR_STATE_BUSY_IMMINENT:
1643 break;
1644
1645 default:
1646 DPRINTK(skdev, "drive not online\n");
1647 rc = -ENXIO;
1648 goto out;
1649 }
1650
f721bb0d
AB		 1651 rc = skd_sg_io_get_and_check_args(skdev, &sksgio);
1652 if (rc)
1653 goto out;
1654
1655 rc = skd_sg_io_obtain_skspcl(skdev, &sksgio);
1656 if (rc)
1657 goto out;
1658
1659 rc = skd_sg_io_prep_buffering(skdev, &sksgio);
1660 if (rc)
1661 goto out;
1662
1663 rc = skd_sg_io_copy_buffer(skdev, &sksgio, SG_DXFER_TO_DEV);
1664 if (rc)
e67f86b3
AB		 1665 goto out;
1666
f721bb0d
AB		 1667 rc = skd_sg_io_send_fitmsg(skdev, &sksgio);
1668 if (rc)
e67f86b3
AB		 1669 goto out;
1670
f721bb0d
AB		 1671 rc = skd_sg_io_await(skdev, &sksgio);
1672 if (rc)
1673 goto out;
1674
1675 rc = skd_sg_io_copy_buffer(skdev, &sksgio, SG_DXFER_FROM_DEV);
1676 if (rc)
1677 goto out;
1678
1679 rc = skd_sg_io_put_status(skdev, &sksgio);
1680 if (rc)
e67f86b3
AB		 1681 goto out;
1682
1683 rc = 0;
1684
1685out:
1686 skd_sg_io_release_skspcl(skdev, &sksgio);
1687
1688 if (sksgio.iov != NULL && sksgio.iov != &sksgio.no_iov_iov)
1689 kfree(sksgio.iov);
1690 return rc;
1691}
1692
1693static int skd_sg_io_get_and_check_args(struct skd_device *skdev,
1694 struct skd_sg_io *sksgio)
1695{
1696 struct sg_io_hdr *sgp = &sksgio->sg;
1697 int i, acc;
1698
1699 if (!access_ok(VERIFY_WRITE, sksgio->argp, sizeof(sg_io_hdr_t))) {
1700 DPRINTK(skdev, "access sg failed %p\n", sksgio->argp);
1701 return -EFAULT;
1702 }
1703
1704 if (__copy_from_user(sgp, sksgio->argp, sizeof(sg_io_hdr_t))) {
1705 DPRINTK(skdev, "copy_from_user sg failed %p\n", sksgio->argp);
1706 return -EFAULT;
1707 }
1708
1709 if (sgp->interface_id != SG_INTERFACE_ID_ORIG) {
1710 DPRINTK(skdev, "interface_id invalid 0x%x\n",
1711 sgp->interface_id);
1712 return -EINVAL;
1713 }
1714
1715 if (sgp->cmd_len > sizeof(sksgio->cdb)) {
1716 DPRINTK(skdev, "cmd_len invalid %d\n", sgp->cmd_len);
1717 return -EINVAL;
1718 }
1719
1720 if (sgp->iovec_count > 256) {
1721 DPRINTK(skdev, "iovec_count invalid %d\n", sgp->iovec_count);
1722 return -EINVAL;
1723 }
1724
1725 if (sgp->dxfer_len > (PAGE_SIZE * SKD_N_SG_PER_SPECIAL)) {
1726 DPRINTK(skdev, "dxfer_len invalid %d\n", sgp->dxfer_len);
1727 return -EINVAL;
1728 }
1729
1730 switch (sgp->dxfer_direction) {
1731 case SG_DXFER_NONE:
1732 acc = -1;
1733 break;
1734
1735 case SG_DXFER_TO_DEV:
1736 acc = VERIFY_READ;
1737 break;
1738
1739 case SG_DXFER_FROM_DEV:
1740 case SG_DXFER_TO_FROM_DEV:
1741 acc = VERIFY_WRITE;
1742 break;
1743
1744 default:
1745 DPRINTK(skdev, "dxfer_dir invalid %d\n", sgp->dxfer_direction);
1746 return -EINVAL;
1747 }
1748
1749 if (copy_from_user(sksgio->cdb, sgp->cmdp, sgp->cmd_len)) {
1750 DPRINTK(skdev, "copy_from_user cmdp failed %p\n", sgp->cmdp);
1751 return -EFAULT;
1752 }
1753
1754 if (sgp->mx_sb_len != 0) {
1755 if (!access_ok(VERIFY_WRITE, sgp->sbp, sgp->mx_sb_len)) {
1756 DPRINTK(skdev, "access sbp failed %p\n", sgp->sbp);
1757 return -EFAULT;
1758 }
1759 }
1760
1761 if (sgp->iovec_count == 0) {
1762 sksgio->iov[0].iov_base = sgp->dxferp;
1763 sksgio->iov[0].iov_len = sgp->dxfer_len;
1764 sksgio->iovcnt = 1;
1765 sksgio->dxfer_len = sgp->dxfer_len;
1766 } else {
1767 struct sg_iovec *iov;
1768 uint nbytes = sizeof(*iov) * sgp->iovec_count;
1769 size_t iov_data_len;
1770
1771 iov = kmalloc(nbytes, GFP_KERNEL);
1772 if (iov == NULL) {
1773 DPRINTK(skdev, "alloc iovec failed %d\n",
1774 sgp->iovec_count);
1775 return -ENOMEM;
1776 }
1777 sksgio->iov = iov;
1778 sksgio->iovcnt = sgp->iovec_count;
1779
1780 if (copy_from_user(iov, sgp->dxferp, nbytes)) {
1781 DPRINTK(skdev, "copy_from_user iovec failed %p\n",
1782 sgp->dxferp);
1783 return -EFAULT;
1784 }
1785
1786 /*
1787 * Sum up the vecs, making sure they don't overflow
1788 */
1789 iov_data_len = 0;
1790 for (i = 0; i < sgp->iovec_count; i++) {
1791 if (iov_data_len + iov[i].iov_len < iov_data_len)
1792 return -EINVAL;
1793 iov_data_len += iov[i].iov_len;
1794 }
1795
1796 /* SG_IO howto says that the shorter of the two wins */
1797 if (sgp->dxfer_len < iov_data_len) {
1798 sksgio->iovcnt = iov_shorten((struct iovec *)iov,
1799 sgp->iovec_count,
1800 sgp->dxfer_len);
1801 sksgio->dxfer_len = sgp->dxfer_len;
1802 } else
1803 sksgio->dxfer_len = iov_data_len;
1804 }
1805
1806 if (sgp->dxfer_direction != SG_DXFER_NONE) {
1807 struct sg_iovec *iov = sksgio->iov;
1808 for (i = 0; i < sksgio->iovcnt; i++, iov++) {
1809 if (!access_ok(acc, iov->iov_base, iov->iov_len)) {
1810 DPRINTK(skdev, "access data failed %p/%d\n",
1811 iov->iov_base, (int)iov->iov_len);
1812 return -EFAULT;
1813 }
1814 }
1815 }
1816
1817 return 0;
1818}
1819
1820static int skd_sg_io_obtain_skspcl(struct skd_device *skdev,
1821 struct skd_sg_io *sksgio)
1822{
1823 struct skd_special_context *skspcl = NULL;
1824 int rc;
1825
1826 for (;; ) {
1827 ulong flags;
1828
1829 spin_lock_irqsave(&skdev->lock, flags);
1830 skspcl = skdev->skspcl_free_list;
1831 if (skspcl != NULL) {
1832 skdev->skspcl_free_list =
1833 (struct skd_special_context *)skspcl->req.next;
1834 skspcl->req.id += SKD_ID_INCR;
1835 skspcl->req.state = SKD_REQ_STATE_SETUP;
1836 skspcl->orphaned = 0;
1837 skspcl->req.n_sg = 0;
1838 }
1839 spin_unlock_irqrestore(&skdev->lock, flags);
1840
1841 if (skspcl != NULL) {
1842 rc = 0;
1843 break;
1844 }
1845
1846 DPRINTK(skdev, "blocking\n");
1847
1848 rc = wait_event_interruptible_timeout(
1849 skdev->waitq,
1850 (skdev->skspcl_free_list != NULL),
1851 msecs_to_jiffies(sksgio->sg.timeout));
1852
1853 DPRINTK(skdev, "unblocking, rc=%d\n", rc);
1854
1855 if (rc <= 0) {
1856 if (rc == 0)
1857 rc = -ETIMEDOUT;
1858 else
1859 rc = -EINTR;
1860 break;
1861 }
1862 /*
1863 * If we get here rc > 0 meaning the timeout to
1864 * wait_event_interruptible_timeout() had time left, hence the
1865 * sought event -- non-empty free list -- happened.
1866 * Retry the allocation.
1867 */
1868 }
1869 sksgio->skspcl = skspcl;
1870
1871 return rc;
1872}
1873
1874static int skd_skreq_prep_buffering(struct skd_device *skdev,
1875 struct skd_request_context *skreq,
1876 u32 dxfer_len)
1877{
1878 u32 resid = dxfer_len;
1879
1880 /*
1881 * The DMA engine must have aligned addresses and byte counts.
1882 */
1883 resid += (-resid) & 3;
1884 skreq->sg_byte_count = resid;
1885
1886 skreq->n_sg = 0;
1887
1888 while (resid > 0) {
1889 u32 nbytes = PAGE_SIZE;
1890 u32 ix = skreq->n_sg;
1891 struct scatterlist *sg = &skreq->sg[ix];
1892 struct fit_sg_descriptor *sksg = &skreq->sksg_list[ix];
1893 struct page *page;
1894
1895 if (nbytes > resid)
1896 nbytes = resid;
1897
1898 page = alloc_page(GFP_KERNEL);
1899 if (page == NULL)
1900 return -ENOMEM;
1901
1902 sg_set_page(sg, page, nbytes, 0);
1903
1904 /* TODO: This should be going through a pci_???()
1905 * routine to do proper mapping. */
1906 sksg->control = FIT_SGD_CONTROL_NOT_LAST;
1907 sksg->byte_count = nbytes;
1908
1909 sksg->host_side_addr = sg_phys(sg);
1910
1911 sksg->dev_side_addr = 0;
1912 sksg->next_desc_ptr = skreq->sksg_dma_address +
1913 (ix + 1) * sizeof(*sksg);
1914
1915 skreq->n_sg++;
1916 resid -= nbytes;
1917 }
1918
1919 if (skreq->n_sg > 0) {
1920 u32 ix = skreq->n_sg - 1;
1921 struct fit_sg_descriptor *sksg = &skreq->sksg_list[ix];
1922
1923 sksg->control = FIT_SGD_CONTROL_LAST;
1924 sksg->next_desc_ptr = 0;
1925 }
1926
1927 if (unlikely(skdev->dbg_level > 1)) {
1928 u32 i;
1929
1930 VPRINTK(skdev, "skreq=%x sksg_list=%p sksg_dma=%llx\n",
1931 skreq->id, skreq->sksg_list, skreq->sksg_dma_address);
1932 for (i = 0; i < skreq->n_sg; i++) {
1933 struct fit_sg_descriptor *sgd = &skreq->sksg_list[i];
1934
1935 VPRINTK(skdev, " sg[%d] count=%u ctrl=0x%x "
1936 "addr=0x%llx next=0x%llx\n",
1937 i, sgd->byte_count, sgd->control,
1938 sgd->host_side_addr, sgd->next_desc_ptr);
1939 }
1940 }
1941
1942 return 0;
1943}
1944
1945static int skd_sg_io_prep_buffering(struct skd_device *skdev,
1946 struct skd_sg_io *sksgio)
1947{
1948 struct skd_special_context *skspcl = sksgio->skspcl;
1949 struct skd_request_context *skreq = &skspcl->req;
1950 u32 dxfer_len = sksgio->dxfer_len;
1951 int rc;
1952
1953 rc = skd_skreq_prep_buffering(skdev, skreq, dxfer_len);
1954 /*
1955 * Eventually, errors or not, skd_release_special() is called
1956 * to recover allocations including partial allocations.
1957 */
1958 return rc;
1959}
1960
1961static int skd_sg_io_copy_buffer(struct skd_device *skdev,
1962 struct skd_sg_io *sksgio, int dxfer_dir)
1963{
1964 struct skd_special_context *skspcl = sksgio->skspcl;
1965 u32 iov_ix = 0;
1966 struct sg_iovec curiov;
1967 u32 sksg_ix = 0;
1968 u8 *bufp = NULL;
1969 u32 buf_len = 0;
1970 u32 resid = sksgio->dxfer_len;
1971 int rc;
1972
1973 curiov.iov_len = 0;
1974 curiov.iov_base = NULL;
1975
1976 if (dxfer_dir != sksgio->sg.dxfer_direction) {
1977 if (dxfer_dir != SG_DXFER_TO_DEV ||
1978 sksgio->sg.dxfer_direction != SG_DXFER_TO_FROM_DEV)
1979 return 0;
1980 }
1981
1982 while (resid > 0) {
1983 u32 nbytes = PAGE_SIZE;
1984
1985 if (curiov.iov_len == 0) {
1986 curiov = sksgio->iov[iov_ix++];
1987 continue;
1988 }
1989
1990 if (buf_len == 0) {
1991 struct page *page;
1992 page = sg_page(&skspcl->req.sg[sksg_ix++]);
1993 bufp = page_address(page);
1994 buf_len = PAGE_SIZE;
1995 }
1996
1997 nbytes = min_t(u32, nbytes, resid);
1998 nbytes = min_t(u32, nbytes, curiov.iov_len);
1999 nbytes = min_t(u32, nbytes, buf_len);
2000
2001 if (dxfer_dir == SG_DXFER_TO_DEV)
2002 rc = __copy_from_user(bufp, curiov.iov_base, nbytes);
2003 else
2004 rc = __copy_to_user(curiov.iov_base, bufp, nbytes);
2005
2006 if (rc)
2007 return -EFAULT;
2008
2009 resid -= nbytes;
2010 curiov.iov_len -= nbytes;
2011 curiov.iov_base += nbytes;
2012 buf_len -= nbytes;
2013 }
2014
2015 return 0;
2016}
2017
2018static int skd_sg_io_send_fitmsg(struct skd_device *skdev,
2019 struct skd_sg_io *sksgio)
2020{
2021 struct skd_special_context *skspcl = sksgio->skspcl;
2022 struct fit_msg_hdr *fmh = (struct fit_msg_hdr *)skspcl->msg_buf;
2023 struct skd_scsi_request *scsi_req = (struct skd_scsi_request *)&fmh[1];
2024
2025 memset(skspcl->msg_buf, 0, SKD_N_SPECIAL_FITMSG_BYTES);
2026
2027 /* Initialize the FIT msg header */
2028 fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT;
2029 fmh->num_protocol_cmds_coalesced = 1;
2030
2031 /* Initialize the SCSI request */
2032 if (sksgio->sg.dxfer_direction != SG_DXFER_NONE)
2033 scsi_req->hdr.sg_list_dma_address =
2034 cpu_to_be64(skspcl->req.sksg_dma_address);
2035 scsi_req->hdr.tag = skspcl->req.id;
2036 scsi_req->hdr.sg_list_len_bytes =
2037 cpu_to_be32(skspcl->req.sg_byte_count);
2038 memcpy(scsi_req->cdb, sksgio->cdb, sizeof(scsi_req->cdb));
2039
2040 skspcl->req.state = SKD_REQ_STATE_BUSY;
2041 skd_send_special_fitmsg(skdev, skspcl);
2042
2043 return 0;
2044}
2045
2046static int skd_sg_io_await(struct skd_device *skdev, struct skd_sg_io *sksgio)
2047{
2048 unsigned long flags;
2049 int rc;
2050
2051 rc = wait_event_interruptible_timeout(skdev->waitq,
2052 (sksgio->skspcl->req.state !=
2053 SKD_REQ_STATE_BUSY),
2054 msecs_to_jiffies(sksgio->sg.
2055 timeout));
2056
2057 spin_lock_irqsave(&skdev->lock, flags);
2058
2059 if (sksgio->skspcl->req.state == SKD_REQ_STATE_ABORTED) {
2060 DPRINTK(skdev, "skspcl %p aborted\n", sksgio->skspcl);
2061
2062 /* Build check cond, sense and let command finish. */
2063 /* For a timeout, we must fabricate completion and sense
2064 * data to complete the command */
2065 sksgio->skspcl->req.completion.status =
2066 SAM_STAT_CHECK_CONDITION;
2067
2068 memset(&sksgio->skspcl->req.err_info, 0,
2069 sizeof(sksgio->skspcl->req.err_info));
2070 sksgio->skspcl->req.err_info.type = 0x70;
2071 sksgio->skspcl->req.err_info.key = ABORTED_COMMAND;
2072 sksgio->skspcl->req.err_info.code = 0x44;
2073 sksgio->skspcl->req.err_info.qual = 0;
2074 rc = 0;
2075 } else if (sksgio->skspcl->req.state != SKD_REQ_STATE_BUSY)
2076 /* No longer on the adapter. We finish. */
2077 rc = 0;
2078 else {
2079 /* Something's gone wrong. Still busy. Timeout or
2080 * user interrupted (control-C). Mark as an orphan
2081 * so it will be disposed when completed. */
2082 sksgio->skspcl->orphaned = 1;
2083 sksgio->skspcl = NULL;
2084 if (rc == 0) {
2085 DPRINTK(skdev, "timed out %p (%u ms)\n", sksgio,
2086 sksgio->sg.timeout);
2087 rc = -ETIMEDOUT;
2088 } else {
2089 DPRINTK(skdev, "cntlc %p\n", sksgio);
2090 rc = -EINTR;
2091 }
2092 }
2093
2094 spin_unlock_irqrestore(&skdev->lock, flags);
2095
2096 return rc;
2097}
2098
2099static int skd_sg_io_put_status(struct skd_device *skdev,
2100 struct skd_sg_io *sksgio)
2101{
2102 struct sg_io_hdr *sgp = &sksgio->sg;
2103 struct skd_special_context *skspcl = sksgio->skspcl;
2104 int resid = 0;
2105
2106 u32 nb = be32_to_cpu(skspcl->req.completion.num_returned_bytes);
2107
2108 sgp->status = skspcl->req.completion.status;
2109 resid = sksgio->dxfer_len - nb;
2110
2111 sgp->masked_status = sgp->status & STATUS_MASK;
2112 sgp->msg_status = 0;
2113 sgp->host_status = 0;
2114 sgp->driver_status = 0;
2115 sgp->resid = resid;
2116 if (sgp->masked_status || sgp->host_status || sgp->driver_status)
2117 sgp->info |= SG_INFO_CHECK;
2118
2119 DPRINTK(skdev, "status %x masked %x resid 0x%x\n", sgp->status,
2120 sgp->masked_status, sgp->resid);
2121
2122 if (sgp->masked_status == SAM_STAT_CHECK_CONDITION) {
2123 if (sgp->mx_sb_len > 0) {
2124 struct fit_comp_error_info *ei = &skspcl->req.err_info;
2125 u32 nbytes = sizeof(*ei);
2126
2127 nbytes = min_t(u32, nbytes, sgp->mx_sb_len);
2128
2129 sgp->sb_len_wr = nbytes;
2130
2131 if (__copy_to_user(sgp->sbp, ei, nbytes)) {
2132 DPRINTK(skdev, "copy_to_user sense failed %p\n",
2133 sgp->sbp);
2134 return -EFAULT;
2135 }
2136 }
2137 }
2138
2139 if (__copy_to_user(sksgio->argp, sgp, sizeof(sg_io_hdr_t))) {
2140 DPRINTK(skdev, "copy_to_user sg failed %p\n", sksgio->argp);
2141 return -EFAULT;
2142 }
2143
2144 return 0;
2145}
2146
2147static int skd_sg_io_release_skspcl(struct skd_device *skdev,
2148 struct skd_sg_io *sksgio)
2149{
2150 struct skd_special_context *skspcl = sksgio->skspcl;
2151
2152 if (skspcl != NULL) {
2153 ulong flags;
2154
2155 sksgio->skspcl = NULL;
2156
2157 spin_lock_irqsave(&skdev->lock, flags);
2158 skd_release_special(skdev, skspcl);
2159 spin_unlock_irqrestore(&skdev->lock, flags);
2160 }
2161
2162 return 0;
2163}
2164
2165/*
2166 *****************************************************************************
2167 * INTERNAL REQUESTS -- generated by driver itself
2168 *****************************************************************************
2169 */
2170
2171static int skd_format_internal_skspcl(struct skd_device *skdev)
2172{
2173 struct skd_special_context *skspcl = &skdev->internal_skspcl;
2174 struct fit_sg_descriptor *sgd = &skspcl->req.sksg_list[0];
2175 struct fit_msg_hdr *fmh;
2176 uint64_t dma_address;
2177 struct skd_scsi_request *scsi;
2178
2179 fmh = (struct fit_msg_hdr *)&skspcl->msg_buf[0];
2180 fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT;
2181 fmh->num_protocol_cmds_coalesced = 1;
2182
2183 scsi = (struct skd_scsi_request *)&skspcl->msg_buf[64];
2184 memset(scsi, 0, sizeof(*scsi));
2185 dma_address = skspcl->req.sksg_dma_address;
2186 scsi->hdr.sg_list_dma_address = cpu_to_be64(dma_address);
2187 sgd->control = FIT_SGD_CONTROL_LAST;
2188 sgd->byte_count = 0;
2189 sgd->host_side_addr = skspcl->db_dma_address;
2190 sgd->dev_side_addr = 0;
2191 sgd->next_desc_ptr = 0LL;
2192
2193 return 1;
2194}
2195
2196#define WR_BUF_SIZE SKD_N_INTERNAL_BYTES
2197
2198static void skd_send_internal_skspcl(struct skd_device *skdev,
2199 struct skd_special_context *skspcl,
2200 u8 opcode)
2201{
2202 struct fit_sg_descriptor *sgd = &skspcl->req.sksg_list[0];
2203 struct skd_scsi_request *scsi;
2204 unsigned char *buf = skspcl->data_buf;
2205 int i;
2206
2207 if (skspcl->req.state != SKD_REQ_STATE_IDLE)
2208 /*
2209 * A refresh is already in progress.
2210 * Just wait for it to finish.
2211 */
2212 return;
2213
2214 SKD_ASSERT((skspcl->req.id & SKD_ID_INCR) == 0);
2215 skspcl->req.state = SKD_REQ_STATE_BUSY;
2216 skspcl->req.id += SKD_ID_INCR;
2217
2218 scsi = (struct skd_scsi_request *)&skspcl->msg_buf[64];
2219 scsi->hdr.tag = skspcl->req.id;
2220
2221 memset(scsi->cdb, 0, sizeof(scsi->cdb));
2222
2223 switch (opcode) {
2224 case TEST_UNIT_READY:
2225 scsi->cdb[0] = TEST_UNIT_READY;
2226 sgd->byte_count = 0;
2227 scsi->hdr.sg_list_len_bytes = 0;
2228 break;
2229
2230 case READ_CAPACITY:
2231 scsi->cdb[0] = READ_CAPACITY;
2232 sgd->byte_count = SKD_N_READ_CAP_BYTES;
2233 scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
2234 break;
2235
2236 case INQUIRY:
2237 scsi->cdb[0] = INQUIRY;
2238 scsi->cdb[1] = 0x01; /* evpd */
2239 scsi->cdb[2] = 0x80; /* serial number page */
2240 scsi->cdb[4] = 0x10;
2241 sgd->byte_count = 16;
2242 scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
2243 break;
2244
2245 case SYNCHRONIZE_CACHE:
2246 scsi->cdb[0] = SYNCHRONIZE_CACHE;
2247 sgd->byte_count = 0;
2248 scsi->hdr.sg_list_len_bytes = 0;
2249 break;
2250
2251 case WRITE_BUFFER:
2252 scsi->cdb[0] = WRITE_BUFFER;
2253 scsi->cdb[1] = 0x02;
2254 scsi->cdb[7] = (WR_BUF_SIZE & 0xFF00) >> 8;
2255 scsi->cdb[8] = WR_BUF_SIZE & 0xFF;
2256 sgd->byte_count = WR_BUF_SIZE;
2257 scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
2258 /* fill incrementing byte pattern */
2259 for (i = 0; i < sgd->byte_count; i++)
2260 buf[i] = i & 0xFF;
2261 break;
2262
2263 case READ_BUFFER:
2264 scsi->cdb[0] = READ_BUFFER;
2265 scsi->cdb[1] = 0x02;
2266 scsi->cdb[7] = (WR_BUF_SIZE & 0xFF00) >> 8;
2267 scsi->cdb[8] = WR_BUF_SIZE & 0xFF;
2268 sgd->byte_count = WR_BUF_SIZE;
2269 scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
2270 memset(skspcl->data_buf, 0, sgd->byte_count);
2271 break;
2272
2273 default:
2274 SKD_ASSERT("Don't know what to send");
2275 return;
2276
2277 }
2278 skd_send_special_fitmsg(skdev, skspcl);
2279}
2280
2281static void skd_refresh_device_data(struct skd_device *skdev)
2282{
2283 struct skd_special_context *skspcl = &skdev->internal_skspcl;
2284
2285 skd_send_internal_skspcl(skdev, skspcl, TEST_UNIT_READY);
2286}
2287
2288static int skd_chk_read_buf(struct skd_device *skdev,
2289 struct skd_special_context *skspcl)
2290{
2291 unsigned char *buf = skspcl->data_buf;
2292 int i;
2293
2294 /* check for incrementing byte pattern */
2295 for (i = 0; i < WR_BUF_SIZE; i++)
2296 if (buf[i] != (i & 0xFF))
2297 return 1;
2298
2299 return 0;
2300}
2301
2302static void skd_log_check_status(struct skd_device *skdev, u8 status, u8 key,
2303 u8 code, u8 qual, u8 fruc)
2304{
2305 /* If the check condition is of special interest, log a message */
2306 if ((status == SAM_STAT_CHECK_CONDITION) && (key == 0x02)
2307 && (code == 0x04) && (qual == 0x06)) {
2308 pr_err("(%s): *** LOST_WRITE_DATA ERROR *** key/asc/"
2309 "ascq/fruc %02x/%02x/%02x/%02x\n",
2310 skd_name(skdev), key, code, qual, fruc);
2311 }
2312}
2313
2314static void skd_complete_internal(struct skd_device *skdev,
2315 volatile struct fit_completion_entry_v1
2316 *skcomp,
2317 volatile struct fit_comp_error_info *skerr,
2318 struct skd_special_context *skspcl)
2319{
2320 u8 *buf = skspcl->data_buf;
2321 u8 status;
2322 int i;
2323 struct skd_scsi_request *scsi =
2324 (struct skd_scsi_request *)&skspcl->msg_buf[64];
2325
2326 SKD_ASSERT(skspcl == &skdev->internal_skspcl);
2327
2328 DPRINTK(skdev, "complete internal %x\n", scsi->cdb[0]);
2329
2330 skspcl->req.completion = *skcomp;
2331 skspcl->req.state = SKD_REQ_STATE_IDLE;
2332 skspcl->req.id += SKD_ID_INCR;
2333
2334 status = skspcl->req.completion.status;
2335
2336 skd_log_check_status(skdev, status, skerr->key, skerr->code,
2337 skerr->qual, skerr->fruc);
2338
2339 switch (scsi->cdb[0]) {
2340 case TEST_UNIT_READY:
2341 if (status == SAM_STAT_GOOD)
2342 skd_send_internal_skspcl(skdev, skspcl, WRITE_BUFFER);
2343 else if ((status == SAM_STAT_CHECK_CONDITION) &&
2344 (skerr->key == MEDIUM_ERROR))
2345 skd_send_internal_skspcl(skdev, skspcl, WRITE_BUFFER);
2346 else {
2347 if (skdev->state == SKD_DRVR_STATE_STOPPING) {
2348 VPRINTK(skdev, "TUR failed, don't send anymore"
2349 "state 0x%x\n", skdev->state);
2350 return;
2351 }
2352 DPRINTK(skdev, "**** TUR failed, retry skerr\n");
2353 skd_send_internal_skspcl(skdev, skspcl, 0x00);
2354 }
2355 break;
2356
2357 case WRITE_BUFFER:
2358 if (status == SAM_STAT_GOOD)
2359 skd_send_internal_skspcl(skdev, skspcl, READ_BUFFER);
2360 else {
2361 if (skdev->state == SKD_DRVR_STATE_STOPPING) {
2362 VPRINTK(skdev, "write buffer failed, don't send"
2363 " anymore state 0x%x\n", skdev->state);
2364 return;
2365 }
2366 DPRINTK(skdev,
2367 "**** write buffer failed, retry skerr\n");
2368 skd_send_internal_skspcl(skdev, skspcl, 0x00);
2369 }
2370 break;
2371
2372 case READ_BUFFER:
2373 if (status == SAM_STAT_GOOD) {
2374 if (skd_chk_read_buf(skdev, skspcl) == 0)
2375 skd_send_internal_skspcl(skdev, skspcl,
2376 READ_CAPACITY);
2377 else {
2378 pr_err(
2379 "(%s):*** W/R Buffer mismatch %d ***\n",
2380 skd_name(skdev), skdev->connect_retries);
2381 if (skdev->connect_retries <
2382 SKD_MAX_CONNECT_RETRIES) {
2383 skdev->connect_retries++;
2384 skd_soft_reset(skdev);
2385 } else {
2386 pr_err(
2387 "(%s): W/R Buffer Connect Error\n",
2388 skd_name(skdev));
2389 return;
2390 }
2391 }
2392
2393 } else {
2394 if (skdev->state == SKD_DRVR_STATE_STOPPING) {
2395 VPRINTK(skdev,
2396 "read buffer failed, don't send anymore"
2397 "state 0x%x\n", skdev->state);
2398 return;
2399 }
2400 DPRINTK(skdev,
2401 "**** read buffer failed, retry skerr\n");
2402 skd_send_internal_skspcl(skdev, skspcl, 0x00);
2403 }
2404 break;
2405
2406 case READ_CAPACITY:
2407 skdev->read_cap_is_valid = 0;
2408 if (status == SAM_STAT_GOOD) {
2409 skdev->read_cap_last_lba =
2410 (buf[0] << 24) | (buf[1] << 16) |
2411 (buf[2] << 8) | buf[3];
2412 skdev->read_cap_blocksize =
2413 (buf[4] << 24) | (buf[5] << 16) |
2414 (buf[6] << 8) | buf[7];
2415
2416 DPRINTK(skdev, "last lba %d, bs %d\n",
2417 skdev->read_cap_last_lba,
2418 skdev->read_cap_blocksize);
2419
2420 set_capacity(skdev->disk, skdev->read_cap_last_lba + 1);
2421
2422 skdev->read_cap_is_valid = 1;
2423
2424 skd_send_internal_skspcl(skdev, skspcl, INQUIRY);
2425 } else if ((status == SAM_STAT_CHECK_CONDITION) &&
2426 (skerr->key == MEDIUM_ERROR)) {
2427 skdev->read_cap_last_lba = ~0;
2428 set_capacity(skdev->disk, skdev->read_cap_last_lba + 1);
2429 DPRINTK(skdev,
2430 "**** MEDIUM ERROR caused READCAP to fail, ignore failure and continue to inquiry\n");
2431 skd_send_internal_skspcl(skdev, skspcl, INQUIRY);
2432 } else {
2433 DPRINTK(skdev, "**** READCAP failed, retry TUR\n");
2434 skd_send_internal_skspcl(skdev, skspcl,
2435 TEST_UNIT_READY);
2436 }
2437 break;
2438
2439 case INQUIRY:
2440 skdev->inquiry_is_valid = 0;
2441 if (status == SAM_STAT_GOOD) {
2442 skdev->inquiry_is_valid = 1;
2443
2444 for (i = 0; i < 12; i++)
2445 skdev->inq_serial_num[i] = buf[i + 4];
2446 skdev->inq_serial_num[12] = 0;
2447 }
2448
2449 if (skd_unquiesce_dev(skdev) < 0)
2450 DPRINTK(skdev, "**** failed, to ONLINE device\n");
2451 /* connection is complete */
2452 skdev->connect_retries = 0;
2453 break;
2454
2455 case SYNCHRONIZE_CACHE:
2456 if (status == SAM_STAT_GOOD)
2457 skdev->sync_done = 1;
2458 else
2459 skdev->sync_done = -1;
2460 wake_up_interruptible(&skdev->waitq);
2461 break;
2462
2463 default:
2464 SKD_ASSERT("we didn't send this");
2465 }
2466}
2467
2468/*
2469 *****************************************************************************
2470 * FIT MESSAGES
2471 *****************************************************************************
2472 */
2473
2474static void skd_send_fitmsg(struct skd_device *skdev,
2475 struct skd_fitmsg_context *skmsg)
2476{
2477 u64 qcmd;
2478 struct fit_msg_hdr *fmh;
2479
2480 VPRINTK(skdev, "dma address 0x%llx, busy=%d\n",
2481 skmsg->mb_dma_address, skdev->in_flight);
2482 VPRINTK(skdev, "msg_buf 0x%p, offset %x\n",
2483 skmsg->msg_buf, skmsg->offset);
2484
2485 qcmd = skmsg->mb_dma_address;
2486 qcmd |= FIT_QCMD_QID_NORMAL;
2487
2488 fmh = (struct fit_msg_hdr *)skmsg->msg_buf;
2489 skmsg->outstanding = fmh->num_protocol_cmds_coalesced;
2490
2491 if (unlikely(skdev->dbg_level > 1)) {
2492 u8 *bp = (u8 *)skmsg->msg_buf;
2493 int i;
2494 for (i = 0; i < skmsg->length; i += 8) {
2495 VPRINTK(skdev, " msg[%2d] %02x %02x %02x %02x "
2496 "%02x %02x %02x %02x\n",
2497 i, bp[i + 0], bp[i + 1], bp[i + 2],
2498 bp[i + 3], bp[i + 4], bp[i + 5],
2499 bp[i + 6], bp[i + 7]);
2500 if (i == 0)
2501 i = 64 - 8;
2502 }
2503 }
2504
2505 if (skmsg->length > 256)
2506 qcmd |= FIT_QCMD_MSGSIZE_512;
2507 else if (skmsg->length > 128)
2508 qcmd |= FIT_QCMD_MSGSIZE_256;
2509 else if (skmsg->length > 64)
2510 qcmd |= FIT_QCMD_MSGSIZE_128;
2511 else
2512 /*
2513 * This makes no sense because the FIT msg header is
2514 * 64 bytes. If the msg is only 64 bytes long it has
2515 * no payload.
2516 */
2517 qcmd |= FIT_QCMD_MSGSIZE_64;
2518
2519 SKD_WRITEQ(skdev, qcmd, FIT_Q_COMMAND);
2520
2521}
2522
2523static void skd_send_special_fitmsg(struct skd_device *skdev,
2524 struct skd_special_context *skspcl)
2525{
2526 u64 qcmd;
2527
2528 if (unlikely(skdev->dbg_level > 1)) {
2529 u8 *bp = (u8 *)skspcl->msg_buf;
2530 int i;
2531
2532 for (i = 0; i < SKD_N_SPECIAL_FITMSG_BYTES; i += 8) {
2533 VPRINTK(skdev,
2534 " spcl[%2d] %02x %02x %02x %02x "
2535 "%02x %02x %02x %02x\n", i,
2536 bp[i + 0], bp[i + 1], bp[i + 2], bp[i + 3],
2537 bp[i + 4], bp[i + 5], bp[i + 6], bp[i + 7]);
2538 if (i == 0)
2539 i = 64 - 8;
2540 }
2541
2542 VPRINTK(skdev, "skspcl=%p id=%04x sksg_list=%p sksg_dma=%llx\n",
2543 skspcl, skspcl->req.id, skspcl->req.sksg_list,
2544 skspcl->req.sksg_dma_address);
2545 for (i = 0; i < skspcl->req.n_sg; i++) {
2546 struct fit_sg_descriptor *sgd =
2547 &skspcl->req.sksg_list[i];
2548
2549 VPRINTK(skdev, " sg[%d] count=%u ctrl=0x%x "
2550 "addr=0x%llx next=0x%llx\n",
2551 i, sgd->byte_count, sgd->control,
2552 sgd->host_side_addr, sgd->next_desc_ptr);
2553 }
2554 }
2555
2556 /*
2557 * Special FIT msgs are always 128 bytes: a 64-byte FIT hdr
2558 * and one 64-byte SSDI command.
2559 */
2560 qcmd = skspcl->mb_dma_address;
2561 qcmd |= FIT_QCMD_QID_NORMAL + FIT_QCMD_MSGSIZE_128;
2562
2563 SKD_WRITEQ(skdev, qcmd, FIT_Q_COMMAND);
2564}
2565
2566/*
2567 *****************************************************************************
2568 * COMPLETION QUEUE
2569 *****************************************************************************
2570 */
2571
2572static void skd_complete_other(struct skd_device *skdev,
2573 volatile struct fit_completion_entry_v1 *skcomp,
2574 volatile struct fit_comp_error_info *skerr);
2575
2576
2577static void skd_requeue_request(struct skd_device *skdev,
2578 struct skd_request_context *skreq);
2579
2580struct sns_info {
2581 u8 type;
2582 u8 stat;
2583 u8 key;
2584 u8 asc;
2585 u8 ascq;
2586 u8 mask;
2587 enum skd_check_status_action action;
2588};
2589
2590static struct sns_info skd_chkstat_table[] = {
2591 /* Good */
2592 { 0x70, 0x02, RECOVERED_ERROR, 0, 0, 0x1c,
2593 SKD_CHECK_STATUS_REPORT_GOOD },
2594
2595 /* Smart alerts */
2596 { 0x70, 0x02, NO_SENSE, 0x0B, 0x00, 0x1E, /* warnings */
2597 SKD_CHECK_STATUS_REPORT_SMART_ALERT },
2598 { 0x70, 0x02, NO_SENSE, 0x5D, 0x00, 0x1E, /* thresholds */
2599 SKD_CHECK_STATUS_REPORT_SMART_ALERT },
2600 { 0x70, 0x02, RECOVERED_ERROR, 0x0B, 0x01, 0x1F, /* temperature over trigger */
2601 SKD_CHECK_STATUS_REPORT_SMART_ALERT },
2602
2603 /* Retry (with limits) */
2604 { 0x70, 0x02, 0x0B, 0, 0, 0x1C, /* This one is for DMA ERROR */
2605 SKD_CHECK_STATUS_REQUEUE_REQUEST },
2606 { 0x70, 0x02, 0x06, 0x0B, 0x00, 0x1E, /* warnings */
2607 SKD_CHECK_STATUS_REQUEUE_REQUEST },
2608 { 0x70, 0x02, 0x06, 0x5D, 0x00, 0x1E, /* thresholds */
2609 SKD_CHECK_STATUS_REQUEUE_REQUEST },
2610 { 0x70, 0x02, 0x06, 0x80, 0x30, 0x1F, /* backup power */
2611 SKD_CHECK_STATUS_REQUEUE_REQUEST },
2612
2613 /* Busy (or about to be) */
2614 { 0x70, 0x02, 0x06, 0x3f, 0x01, 0x1F, /* fw changed */
2615 SKD_CHECK_STATUS_BUSY_IMMINENT },
2616};
2617
2618/*
2619 * Look up status and sense data to decide how to handle the error
2620 * from the device.
2621 * mask says which fields must match e.g., mask=0x18 means check
2622 * type and stat, ignore key, asc, ascq.
2623 */
2624
2625static enum skd_check_status_action skd_check_status(struct skd_device *skdev,
2626 u8 cmp_status,
2627 volatile struct fit_comp_error_info *skerr)
2628{
2629 int i, n;
2630
2631 pr_err("(%s): key/asc/ascq/fruc %02x/%02x/%02x/%02x\n",
2632 skd_name(skdev), skerr->key, skerr->code, skerr->qual,
2633 skerr->fruc);
2634
2635 VPRINTK(skdev, "stat: t=%02x stat=%02x k=%02x c=%02x q=%02x "
2636 "fruc=%02x\n", skerr->type, cmp_status, skerr->key,
2637 skerr->code, skerr->qual, skerr->fruc);
2638
2639 /* Does the info match an entry in the good category? */
2640 n = sizeof(skd_chkstat_table) / sizeof(skd_chkstat_table[0]);
2641 for (i = 0; i < n; i++) {
2642 struct sns_info *sns = &skd_chkstat_table[i];
2643
2644 if (sns->mask & 0x10)
2645 if (skerr->type != sns->type)
2646 continue;
2647
2648 if (sns->mask & 0x08)
2649 if (cmp_status != sns->stat)
2650 continue;
2651
2652 if (sns->mask & 0x04)
2653 if (skerr->key != sns->key)
2654 continue;
2655
2656 if (sns->mask & 0x02)
2657 if (skerr->code != sns->asc)
2658 continue;
2659
2660 if (sns->mask & 0x01)
2661 if (skerr->qual != sns->ascq)
2662 continue;
2663
2664 if (sns->action == SKD_CHECK_STATUS_REPORT_SMART_ALERT) {
2665 pr_err("(%s): SMART Alert: sense key/asc/ascq "
2666 "%02x/%02x/%02x\n",
2667 skd_name(skdev), skerr->key,
2668 skerr->code, skerr->qual);
2669 }
2670 return sns->action;
2671 }
2672
2673 /* No other match, so nonzero status means error,
2674 * zero status means good
2675 */
2676 if (cmp_status) {
2677 DPRINTK(skdev, "status check: error\n");
2678 return SKD_CHECK_STATUS_REPORT_ERROR;
2679 }
2680
2681 DPRINTK(skdev, "status check good default\n");
2682 return SKD_CHECK_STATUS_REPORT_GOOD;
2683}
2684
2685static void skd_resolve_req_exception(struct skd_device *skdev,
2686 struct skd_request_context *skreq)
2687{
2688 u8 cmp_status = skreq->completion.status;
2689
2690 switch (skd_check_status(skdev, cmp_status, &skreq->err_info)) {
2691 case SKD_CHECK_STATUS_REPORT_GOOD:
2692 case SKD_CHECK_STATUS_REPORT_SMART_ALERT:
2693 skd_end_request(skdev, skreq, 0);
2694 break;
2695
2696 case SKD_CHECK_STATUS_BUSY_IMMINENT:
2697 skd_log_skreq(skdev, skreq, "retry(busy)");
2698 skd_requeue_request(skdev, skreq);
2699 pr_info("(%s) drive BUSY imminent\n", skd_name(skdev));
2700 skdev->state = SKD_DRVR_STATE_BUSY_IMMINENT;
2701 skdev->timer_countdown = SKD_TIMER_MINUTES(20);
2702 skd_quiesce_dev(skdev);
2703 break;
2704
2705 case SKD_CHECK_STATUS_REQUEUE_REQUEST:
2706 if (!skd_bio) {
2707 if ((unsigned long) ++skreq->req->special <
2708 SKD_MAX_RETRIES) {
2709 skd_log_skreq(skdev, skreq, "retry");
2710 skd_requeue_request(skdev, skreq);
2711 break;
2712 }
2713 }
2714 /* fall through to report error */
2715
2716 case SKD_CHECK_STATUS_REPORT_ERROR:
2717 default:
2718 skd_end_request(skdev, skreq, -EIO);
2719 break;
2720 }
2721}
2722
2723static void skd_requeue_request(struct skd_device *skdev,
2724 struct skd_request_context *skreq)
2725{
2726 if (!skd_bio) {
2727 blk_requeue_request(skdev->queue, skreq->req);
2728 } else {
2729 bio_list_add_head(&skdev->bio_queue, skreq->bio);
2730 skreq->bio = NULL;
2731 }
2732}
2733
2734
2735
2736/* assume spinlock is already held */
2737static void skd_release_skreq(struct skd_device *skdev,
2738 struct skd_request_context *skreq)
2739{
2740 u32 msg_slot;
2741 struct skd_fitmsg_context *skmsg;
2742
2743 u32 timo_slot;
2744
2745 /*
2746 * Reclaim the FIT msg buffer if this is
2747 * the first of the requests it carried to
2748 * be completed. The FIT msg buffer used to
2749 * send this request cannot be reused until
2750 * we are sure the s1120 card has copied
2751 * it to its memory. The FIT msg might have
2752 * contained several requests. As soon as
2753 * any of them are completed we know that
2754 * the entire FIT msg was transferred.
2755 * Only the first completed request will
2756 * match the FIT msg buffer id. The FIT
2757 * msg buffer id is immediately updated.
2758 * When subsequent requests complete the FIT
2759 * msg buffer id won't match, so we know
2760 * quite cheaply that it is already done.
2761 */
2762 msg_slot = skreq->fitmsg_id & SKD_ID_SLOT_MASK;
2763 SKD_ASSERT(msg_slot < skdev->num_fitmsg_context);
2764
2765 skmsg = &skdev->skmsg_table[msg_slot];
2766 if (skmsg->id == skreq->fitmsg_id) {
2767 SKD_ASSERT(skmsg->state == SKD_MSG_STATE_BUSY);
2768 SKD_ASSERT(skmsg->outstanding > 0);
2769 skmsg->outstanding--;
2770 if (skmsg->outstanding == 0) {
2771 skmsg->state = SKD_MSG_STATE_IDLE;
2772 skmsg->id += SKD_ID_INCR;
2773 skmsg->next = skdev->skmsg_free_list;
2774 skdev->skmsg_free_list = skmsg;
2775 }
2776 }
2777
2778 /*
2779 * Decrease the number of active requests.
2780 * Also decrements the count in the timeout slot.
2781 */
2782 SKD_ASSERT(skdev->in_flight > 0);
2783 skdev->in_flight -= 1;
2784
2785 timo_slot = skreq->timeout_stamp & SKD_TIMEOUT_SLOT_MASK;
2786 SKD_ASSERT(skdev->timeout_slot[timo_slot] > 0);
2787 skdev->timeout_slot[timo_slot] -= 1;
2788
2789 /*
2790 * Reset backpointer
2791 */
2792 if (likely(!skd_bio))
2793 skreq->req = NULL;
2794 else
2795 skreq->bio = NULL;
2796
2797
2798 /*
2799 * Reclaim the skd_request_context
2800 */
2801 skreq->state = SKD_REQ_STATE_IDLE;
2802 skreq->id += SKD_ID_INCR;
2803 skreq->next = skdev->skreq_free_list;
2804 skdev->skreq_free_list = skreq;
2805}
2806
2807#define DRIVER_INQ_EVPD_PAGE_CODE 0xDA
2808
2809static void skd_do_inq_page_00(struct skd_device *skdev,
2810 volatile struct fit_completion_entry_v1 *skcomp,
2811 volatile struct fit_comp_error_info *skerr,
2812 uint8_t *cdb, uint8_t *buf)
2813{
2814 uint16_t insert_pt, max_bytes, drive_pages, drive_bytes, new_size;
2815
2816 /* Caller requested "supported pages". The driver needs to insert
2817 * its page.
2818 */
2819 VPRINTK(skdev, "skd_do_driver_inquiry: modify supported pages.\n");
2820
2821 /* If the device rejected the request because the CDB was
2822 * improperly formed, then just leave.
2823 */
2824 if (skcomp->status == SAM_STAT_CHECK_CONDITION &&
2825 skerr->key == ILLEGAL_REQUEST && skerr->code == 0x24)
2826 return;
2827
2828 /* Get the amount of space the caller allocated */
2829 max_bytes = (cdb[3] << 8) | cdb[4];
2830
2831 /* Get the number of pages actually returned by the device */
2832 drive_pages = (buf[2] << 8) | buf[3];
2833 drive_bytes = drive_pages + 4;
2834 new_size = drive_pages + 1;
2835
2836 /* Supported pages must be in numerical order, so find where
2837 * the driver page needs to be inserted into the list of
2838 * pages returned by the device.
2839 */
2840 for (insert_pt = 4; insert_pt < drive_bytes; insert_pt++) {
2841 if (buf[insert_pt] == DRIVER_INQ_EVPD_PAGE_CODE)
2842 return; /* Device using this page code. abort */
2843 else if (buf[insert_pt] > DRIVER_INQ_EVPD_PAGE_CODE)
2844 break;
2845 }
2846
2847 if (insert_pt < max_bytes) {
2848 uint16_t u;
2849
2850 /* Shift everything up one byte to make room. */
2851 for (u = new_size + 3; u > insert_pt; u--)
2852 buf[u] = buf[u - 1];
2853 buf[insert_pt] = DRIVER_INQ_EVPD_PAGE_CODE;
2854
2855 /* SCSI byte order increment of num_returned_bytes by 1 */
2856 skcomp->num_returned_bytes =
2857 be32_to_cpu(skcomp->num_returned_bytes) + 1;
2858 skcomp->num_returned_bytes =
2859 be32_to_cpu(skcomp->num_returned_bytes);
2860 }
2861
2862 /* update page length field to reflect the driver's page too */
2863 buf[2] = (uint8_t)((new_size >> 8) & 0xFF);
2864 buf[3] = (uint8_t)((new_size >> 0) & 0xFF);
2865}
2866
2867static void skd_get_link_info(struct pci_dev *pdev, u8 *speed, u8 *width)
2868{
2869 int pcie_reg;
2870 u16 pci_bus_speed;
2871 u8 pci_lanes;
2872
2873 pcie_reg = pci_find_capability(pdev, PCI_CAP_ID_EXP);
2874 if (pcie_reg) {
2875 u16 linksta;
2876 pci_read_config_word(pdev, pcie_reg + PCI_EXP_LNKSTA, &linksta);
2877
2878 pci_bus_speed = linksta & 0xF;
2879 pci_lanes = (linksta & 0x3F0) >> 4;
2880 } else {
2881 *speed = STEC_LINK_UNKNOWN;
2882 *width = 0xFF;
2883 return;
2884 }
2885
2886 switch (pci_bus_speed) {
2887 case 1:
2888 *speed = STEC_LINK_2_5GTS;
2889 break;
2890 case 2:
2891 *speed = STEC_LINK_5GTS;
2892 break;
2893 case 3:
2894 *speed = STEC_LINK_8GTS;
2895 break;
2896 default:
2897 *speed = STEC_LINK_UNKNOWN;
2898 break;
2899 }
2900
2901 if (pci_lanes <= 0x20)
2902 *width = pci_lanes;
2903 else
2904 *width = 0xFF;
2905}
2906
2907static void skd_do_inq_page_da(struct skd_device *skdev,
2908 volatile struct fit_completion_entry_v1 *skcomp,
2909 volatile struct fit_comp_error_info *skerr,
2910 uint8_t *cdb, uint8_t *buf)
2911{
2912 unsigned max_bytes;
2913 struct driver_inquiry_data inq;
2914 u16 val;
2915
2916 VPRINTK(skdev, "skd_do_driver_inquiry: return driver page\n");
2917
2918 memset(&inq, 0, sizeof(inq));
2919
2920 inq.page_code = DRIVER_INQ_EVPD_PAGE_CODE;
2921
2922 if (skdev->pdev && skdev->pdev->bus) {
2923 skd_get_link_info(skdev->pdev,
2924 &inq.pcie_link_speed, &inq.pcie_link_lanes);
2925 inq.pcie_bus_number = cpu_to_be16(skdev->pdev->bus->number);
2926 inq.pcie_device_number = PCI_SLOT(skdev->pdev->devfn);
2927 inq.pcie_function_number = PCI_FUNC(skdev->pdev->devfn);
2928
2929 pci_read_config_word(skdev->pdev, PCI_VENDOR_ID, &val);
2930 inq.pcie_vendor_id = cpu_to_be16(val);
2931
2932 pci_read_config_word(skdev->pdev, PCI_DEVICE_ID, &val);
2933 inq.pcie_device_id = cpu_to_be16(val);
2934
2935 pci_read_config_word(skdev->pdev, PCI_SUBSYSTEM_VENDOR_ID,
2936 &val);
2937 inq.pcie_subsystem_vendor_id = cpu_to_be16(val);
2938
2939 pci_read_config_word(skdev->pdev, PCI_SUBSYSTEM_ID, &val);
2940 inq.pcie_subsystem_device_id = cpu_to_be16(val);
2941 } else {
2942 inq.pcie_bus_number = 0xFFFF;
2943 inq.pcie_device_number = 0xFF;
2944 inq.pcie_function_number = 0xFF;
2945 inq.pcie_link_speed = 0xFF;
2946 inq.pcie_link_lanes = 0xFF;
2947 inq.pcie_vendor_id = 0xFFFF;
2948 inq.pcie_device_id = 0xFFFF;
2949 inq.pcie_subsystem_vendor_id = 0xFFFF;
2950 inq.pcie_subsystem_device_id = 0xFFFF;
2951 }
2952
2953 /* Driver version, fixed lenth, padded with spaces on the right */
2954 inq.driver_version_length = sizeof(inq.driver_version);
2955 memset(&inq.driver_version, ' ', sizeof(inq.driver_version));
2956 memcpy(inq.driver_version, DRV_VER_COMPL,
2957 min(sizeof(inq.driver_version), strlen(DRV_VER_COMPL)));
2958
2959 inq.page_length = cpu_to_be16((sizeof(inq) - 4));
2960
2961 /* Clear the error set by the device */
2962 skcomp->status = SAM_STAT_GOOD;
2963 memset((void *)skerr, 0, sizeof(*skerr));
2964
2965 /* copy response into output buffer */
2966 max_bytes = (cdb[3] << 8) | cdb[4];
2967 memcpy(buf, &inq, min_t(unsigned, max_bytes, sizeof(inq)));
2968
2969 skcomp->num_returned_bytes =
2970 be32_to_cpu(min_t(uint16_t, max_bytes, sizeof(inq)));
2971}
2972
2973static void skd_do_driver_inq(struct skd_device *skdev,
2974 volatile struct fit_completion_entry_v1 *skcomp,
2975 volatile struct fit_comp_error_info *skerr,
2976 uint8_t *cdb, uint8_t *buf)
2977{
2978 if (!buf)
2979 return;
2980 else if (cdb[0] != INQUIRY)
2981 return; /* Not an INQUIRY */
2982 else if ((cdb[1] & 1) == 0)
2983 return; /* EVPD not set */
2984 else if (cdb[2] == 0)
2985 /* Need to add driver's page to supported pages list */
2986 skd_do_inq_page_00(skdev, skcomp, skerr, cdb, buf);
2987 else if (cdb[2] == DRIVER_INQ_EVPD_PAGE_CODE)
2988 /* Caller requested driver's page */
2989 skd_do_inq_page_da(skdev, skcomp, skerr, cdb, buf);
2990}
2991
2992static unsigned char *skd_sg_1st_page_ptr(struct scatterlist *sg)
2993{
2994 if (!sg)
2995 return NULL;
2996 if (!sg_page(sg))
2997 return NULL;
2998 return sg_virt(sg);
2999}
3000
3001static void skd_process_scsi_inq(struct skd_device *skdev,
3002 volatile struct fit_completion_entry_v1
3003 *skcomp,
3004 volatile struct fit_comp_error_info *skerr,
3005 struct skd_special_context *skspcl)
3006{
3007 uint8_t *buf;
3008 struct fit_msg_hdr *fmh = (struct fit_msg_hdr *)skspcl->msg_buf;
3009 struct skd_scsi_request *scsi_req = (struct skd_scsi_request *)&fmh[1];
3010
3011 dma_sync_sg_for_cpu(skdev->class_dev, skspcl->req.sg, skspcl->req.n_sg,
3012 skspcl->req.sg_data_dir);
3013 buf = skd_sg_1st_page_ptr(skspcl->req.sg);
3014
3015 if (buf)
3016 skd_do_driver_inq(skdev, skcomp, skerr, scsi_req->cdb, buf);
3017}
3018
3019
3020static int skd_isr_completion_posted(struct skd_device *skdev,
3021 int limit, int *enqueued)
3022{
3023 volatile struct fit_completion_entry_v1 *skcmp = NULL;
3024 volatile struct fit_comp_error_info *skerr;
3025 u16 req_id;
3026 u32 req_slot;
3027 struct skd_request_context *skreq;
3028 u16 cmp_cntxt = 0;
3029 u8 cmp_status = 0;
3030 u8 cmp_cycle = 0;
3031 u32 cmp_bytes = 0;
3032 int rc = 0;
3033 int processed = 0;
3034 int ret;
3035
3036
3037 for (;; ) {
3038 SKD_ASSERT(skdev->skcomp_ix < SKD_N_COMPLETION_ENTRY);
3039
3040 skcmp = &skdev->skcomp_table[skdev->skcomp_ix];
3041 cmp_cycle = skcmp->cycle;
3042 cmp_cntxt = skcmp->tag;
3043 cmp_status = skcmp->status;
3044 cmp_bytes = be32_to_cpu(skcmp->num_returned_bytes);
3045
3046 skerr = &skdev->skerr_table[skdev->skcomp_ix];
3047
3048 VPRINTK(skdev,
3049 "cycle=%d ix=%d got cycle=%d cmdctxt=0x%x stat=%d "
3050 "busy=%d rbytes=0x%x proto=%d\n", skdev->skcomp_cycle,
3051 skdev->skcomp_ix, cmp_cycle, cmp_cntxt, cmp_status,
3052 skdev->in_flight, cmp_bytes, skdev->proto_ver);
3053
3054 if (cmp_cycle != skdev->skcomp_cycle) {
3055 VPRINTK(skdev, "end of completions\n");
3056 break;
3057 }
3058 /*
3059 * Update the completion queue head index and possibly
3060 * the completion cycle count. 8-bit wrap-around.
3061 */
3062 skdev->skcomp_ix++;
3063 if (skdev->skcomp_ix >= SKD_N_COMPLETION_ENTRY) {
3064 skdev->skcomp_ix = 0;
3065 skdev->skcomp_cycle++;
3066 }
3067
3068 /*
3069 * The command context is a unique 32-bit ID. The low order
3070 * bits help locate the request. The request is usually a
3071 * r/w request (see skd_start() above) or a special request.
3072 */
3073 req_id = cmp_cntxt;
3074 req_slot = req_id & SKD_ID_SLOT_AND_TABLE_MASK;
3075
3076 /* Is this other than a r/w request? */
3077 if (req_slot >= skdev->num_req_context) {
3078 /*
3079 * This is not a completion for a r/w request.
3080 */
3081 skd_complete_other(skdev, skcmp, skerr);
3082 continue;
3083 }
3084
3085 skreq = &skdev->skreq_table[req_slot];
3086
3087 /*
3088 * Make sure the request ID for the slot matches.
3089 */
3090 if (skreq->id != req_id) {
3091 DPRINTK(skdev, "mismatch comp_id=0x%x req_id=0x%x\n",
3092 req_id, skreq->id);
3093 {
3094 u16 new_id = cmp_cntxt;
3095 pr_err("(%s): Completion mismatch "
3096 "comp_id=0x%04x skreq=0x%04x new=0x%04x\n",
3097 skd_name(skdev), req_id,
3098 skreq->id, new_id);
3099
3100 continue;
3101 }
3102 }
3103
3104 SKD_ASSERT(skreq->state == SKD_REQ_STATE_BUSY);
3105
3106 if (skreq->state == SKD_REQ_STATE_ABORTED) {
3107 DPRINTK(skdev, "reclaim req %p id=%04x\n",
3108 skreq, skreq->id);
3109 /* a previously timed out command can
3110 * now be cleaned up */
3111 skd_release_skreq(skdev, skreq);
3112 continue;
3113 }
3114
3115 skreq->completion = *skcmp;
3116 if (unlikely(cmp_status == SAM_STAT_CHECK_CONDITION)) {
3117 skreq->err_info = *skerr;
3118 skd_log_check_status(skdev, cmp_status, skerr->key,
3119 skerr->code, skerr->qual,
3120 skerr->fruc);
3121 }
3122 /* Release DMA resources for the request. */
3123 if (skreq->n_sg > 0)
3124 skd_postop_sg_list(skdev, skreq);
3125
3126 if (((!skd_bio) && !skreq->req) ||
3127 ((skd_bio) && !skreq->bio)) {
3128 DPRINTK(skdev, "NULL backptr skdreq %p, "
3129 "req=0x%x req_id=0x%x\n",
3130 skreq, skreq->id, req_id);
3131 } else {
3132 /*
3133 * Capture the outcome and post it back to the
3134 * native request.
3135 */
3136 if (likely(cmp_status == SAM_STAT_GOOD)) {
3137 if (unlikely(skreq->flush_cmd)) {
3138 if (skd_bio) {
3139 /* if empty size bio, we are all done */
3140 if (bio_sectors(skreq->bio) == 0) {
3141 skd_end_request(skdev, skreq, 0);
3142 } else {
3143 ret = skd_flush_cmd_enqueue(skdev, (void *)skreq->bio);
3144 if (ret != 0) {
3145 pr_err("Failed to enqueue flush bio with Data. Err=%d.\n", ret);
3146 skd_end_request(skdev, skreq, ret);
3147 } else {
3148 ((*enqueued)++);
3149 }
3150 }
3151 } else {
3152 skd_end_request(skdev, skreq, 0);
3153 }
3154 } else {
3155 skd_end_request(skdev, skreq, 0);
3156 }
3157 } else {
3158 skd_resolve_req_exception(skdev, skreq);
3159 }
3160 }
3161
3162 /*
3163 * Release the skreq, its FIT msg (if one), timeout slot,
3164 * and queue depth.
3165 */
3166 skd_release_skreq(skdev, skreq);
3167
3168 /* skd_isr_comp_limit equal zero means no limit */
3169 if (limit) {
3170 if (++processed >= limit) {
3171 rc = 1;
3172 break;
3173 }
3174 }
3175 }
3176
3177 if ((skdev->state == SKD_DRVR_STATE_PAUSING)
3178 && (skdev->in_flight) == 0) {
3179 skdev->state = SKD_DRVR_STATE_PAUSED;
3180 wake_up_interruptible(&skdev->waitq);
3181 }
3182
3183 return rc;
3184}
3185
3186static void skd_complete_other(struct skd_device *skdev,
3187 volatile struct fit_completion_entry_v1 *skcomp,
3188 volatile struct fit_comp_error_info *skerr)
3189{
3190 u32 req_id = 0;
3191 u32 req_table;
3192 u32 req_slot;
3193 struct skd_special_context *skspcl;
3194
3195 req_id = skcomp->tag;
3196 req_table = req_id & SKD_ID_TABLE_MASK;
3197 req_slot = req_id & SKD_ID_SLOT_MASK;
3198
3199 DPRINTK(skdev, "table=0x%x id=0x%x slot=%d\n", req_table, req_id,
3200 req_slot);
3201
3202 /*
3203 * Based on the request id, determine how to dispatch this completion.
3204 * This swich/case is finding the good cases and forwarding the
3205 * completion entry. Errors are reported below the switch.
3206 */
3207 switch (req_table) {
3208 case SKD_ID_RW_REQUEST:
3209 /*
3210 * The caller, skd_completion_posted_isr() above,
3211 * handles r/w requests. The only way we get here
3212 * is if the req_slot is out of bounds.
3213 */
3214 break;
3215
3216 case SKD_ID_SPECIAL_REQUEST:
3217 /*
3218 * Make sure the req_slot is in bounds and that the id
3219 * matches.
3220 */
3221 if (req_slot < skdev->n_special) {
3222 skspcl = &skdev->skspcl_table[req_slot];
3223 if (skspcl->req.id == req_id &&
3224 skspcl->req.state == SKD_REQ_STATE_BUSY) {
3225 skd_complete_special(skdev,
3226 skcomp, skerr, skspcl);
3227 return;
3228 }
3229 }
3230 break;
3231
3232 case SKD_ID_INTERNAL:
3233 if (req_slot == 0) {
3234 skspcl = &skdev->internal_skspcl;
3235 if (skspcl->req.id == req_id &&
3236 skspcl->req.state == SKD_REQ_STATE_BUSY) {
3237 skd_complete_internal(skdev,
3238 skcomp, skerr, skspcl);
3239 return;
3240 }
3241 }
3242 break;
3243
3244 case SKD_ID_FIT_MSG:
3245 /*
3246 * These id's should never appear in a completion record.
3247 */
3248 break;
3249
3250 default:
3251 /*
3252 * These id's should never appear anywhere;
3253 */
3254 break;
3255 }
3256
3257 /*
3258 * If we get here it is a bad or stale id.
3259 */
3260}
3261
3262static void skd_complete_special(struct skd_device *skdev,
3263 volatile struct fit_completion_entry_v1
3264 *skcomp,
3265 volatile struct fit_comp_error_info *skerr,
3266 struct skd_special_context *skspcl)
3267{
3268 DPRINTK(skdev, " completing special request %p\n", skspcl);
3269 if (skspcl->orphaned) {
3270 /* Discard orphaned request */
3271 /* ?: Can this release directly or does it need
3272 * to use a worker? */
3273 DPRINTK(skdev, "release orphaned %p\n", skspcl);
3274 skd_release_special(skdev, skspcl);
3275 return;
3276 }
3277
3278 skd_process_scsi_inq(skdev, skcomp, skerr, skspcl);
3279
3280 skspcl->req.state = SKD_REQ_STATE_COMPLETED;
3281 skspcl->req.completion = *skcomp;
3282 skspcl->req.err_info = *skerr;
3283
3284 skd_log_check_status(skdev, skspcl->req.completion.status, skerr->key,
3285 skerr->code, skerr->qual, skerr->fruc);
3286
3287 wake_up_interruptible(&skdev->waitq);
3288}
3289
3290/* assume spinlock is already held */
3291static void skd_release_special(struct skd_device *skdev,
3292 struct skd_special_context *skspcl)
3293{
3294 int i, was_depleted;
3295
3296 for (i = 0; i < skspcl->req.n_sg; i++) {
3297
3298 struct page *page = sg_page(&skspcl->req.sg[i]);
3299 __free_page(page);
3300 }
3301
3302 was_depleted = (skdev->skspcl_free_list == NULL);
3303
3304 skspcl->req.state = SKD_REQ_STATE_IDLE;
3305 skspcl->req.id += SKD_ID_INCR;
3306 skspcl->req.next =
3307 (struct skd_request_context *)skdev->skspcl_free_list;
3308 skdev->skspcl_free_list = (struct skd_special_context *)skspcl;
3309
3310 if (was_depleted) {
3311 DPRINTK(skdev, "skspcl was depleted\n");
3312 /* Free list was depleted. Their might be waiters. */
3313 wake_up_interruptible(&skdev->waitq);
3314 }
3315}
3316
3317static void skd_reset_skcomp(struct skd_device *skdev)
3318{
3319 u32 nbytes;
3320 struct fit_completion_entry_v1 *skcomp;
3321
3322 nbytes = sizeof(*skcomp) * SKD_N_COMPLETION_ENTRY;
3323 nbytes += sizeof(struct fit_comp_error_info) * SKD_N_COMPLETION_ENTRY;
3324
3325 memset(skdev->skcomp_table, 0, nbytes);
3326
3327 skdev->skcomp_ix = 0;
3328 skdev->skcomp_cycle = 1;
3329}
3330
3331/*
3332 *****************************************************************************
3333 * INTERRUPTS
3334 *****************************************************************************
3335 */
3336static void skd_completion_worker(struct work_struct *work)
3337{
3338 struct skd_device *skdev =
3339 container_of(work, struct skd_device, completion_worker);
3340 unsigned long flags;
3341 int flush_enqueued = 0;
3342
3343 spin_lock_irqsave(&skdev->lock, flags);
3344
3345 /*
3346 * pass in limit=0, which means no limit..
3347 * process everything in compq
3348 */
3349 skd_isr_completion_posted(skdev, 0, &flush_enqueued);
3350 skd_request_fn(skdev->queue);
3351
3352 spin_unlock_irqrestore(&skdev->lock, flags);
3353}
3354
3355static void skd_isr_msg_from_dev(struct skd_device *skdev);
3356
3357irqreturn_t
3358static skd_isr(int irq, void *ptr)
3359{
3360 struct skd_device *skdev;
3361 u32 intstat;
3362 u32 ack;
3363 int rc = 0;
3364 int deferred = 0;
3365 int flush_enqueued = 0;
3366
3367 skdev = (struct skd_device *)ptr;
3368 spin_lock(&skdev->lock);
3369
3370 for (;; ) {
3371 intstat = SKD_READL(skdev, FIT_INT_STATUS_HOST);
3372
3373 ack = FIT_INT_DEF_MASK;
3374 ack &= intstat;
3375
3376 VPRINTK(skdev, "intstat=0x%x ack=0x%x\n", intstat, ack);
3377
3378 /* As long as there is an int pending on device, keep
3379 * running loop. When none, get out, but if we've never
3380 * done any processing, call completion handler?
3381 */
3382 if (ack == 0) {
3383 /* No interrupts on device, but run the completion
3384 * processor anyway?
3385 */
3386 if (rc == 0)
3387 if (likely (skdev->state
3388 == SKD_DRVR_STATE_ONLINE))
3389 deferred = 1;
3390 break;
3391 }
3392
3393 rc = IRQ_HANDLED;
3394
3395 SKD_WRITEL(skdev, ack, FIT_INT_STATUS_HOST);
3396
3397 if (likely((skdev->state != SKD_DRVR_STATE_LOAD) &&
3398 (skdev->state != SKD_DRVR_STATE_STOPPING))) {
3399 if (intstat & FIT_ISH_COMPLETION_POSTED) {
3400 /*
3401 * If we have already deferred completion
3402 * processing, don't bother running it again
3403 */
3404 if (deferred == 0)
3405 deferred =
3406 skd_isr_completion_posted(skdev,
3407 skd_isr_comp_limit, &flush_enqueued);
3408 }
3409
3410 if (intstat & FIT_ISH_FW_STATE_CHANGE) {
3411 skd_isr_fwstate(skdev);
3412 if (skdev->state == SKD_DRVR_STATE_FAULT ||
3413 skdev->state ==
3414 SKD_DRVR_STATE_DISAPPEARED) {
3415 spin_unlock(&skdev->lock);
3416 return rc;
3417 }
3418 }
3419
3420 if (intstat & FIT_ISH_MSG_FROM_DEV)
3421 skd_isr_msg_from_dev(skdev);
3422 }
3423 }
3424
3425 if (unlikely(flush_enqueued))
3426 skd_request_fn(skdev->queue);
3427
3428 if (deferred)
3429 schedule_work(&skdev->completion_worker);
3430 else if (!flush_enqueued)
3431 skd_request_fn(skdev->queue);
3432
3433 spin_unlock(&skdev->lock);
3434
3435 return rc;
3436}
3437
3438
3439static void skd_drive_fault(struct skd_device *skdev)
3440{
3441 skdev->state = SKD_DRVR_STATE_FAULT;
3442 pr_err("(%s): Drive FAULT\n", skd_name(skdev));
3443}
3444
3445static void skd_drive_disappeared(struct skd_device *skdev)
3446{
3447 skdev->state = SKD_DRVR_STATE_DISAPPEARED;
3448 pr_err("(%s): Drive DISAPPEARED\n", skd_name(skdev));
3449}
3450
3451static void skd_isr_fwstate(struct skd_device *skdev)
3452{
3453 u32 sense;
3454 u32 state;
3455 u32 mtd;
3456 int prev_driver_state = skdev->state;
3457
3458 sense = SKD_READL(skdev, FIT_STATUS);
3459 state = sense & FIT_SR_DRIVE_STATE_MASK;
3460
3461 pr_err("(%s): s1120 state %s(%d)=>%s(%d)\n",
3462 skd_name(skdev),
3463 skd_drive_state_to_str(skdev->drive_state), skdev->drive_state,
3464 skd_drive_state_to_str(state), state);
3465
3466 skdev->drive_state = state;
3467
3468 switch (skdev->drive_state) {
3469 case FIT_SR_DRIVE_INIT:
3470 if (skdev->state == SKD_DRVR_STATE_PROTOCOL_MISMATCH) {
3471 skd_disable_interrupts(skdev);
3472 break;
3473 }
3474 if (skdev->state == SKD_DRVR_STATE_RESTARTING)
3475 skd_recover_requests(skdev, 0);
3476 if (skdev->state == SKD_DRVR_STATE_WAIT_BOOT) {
3477 skdev->timer_countdown = SKD_STARTING_TIMO;
3478 skdev->state = SKD_DRVR_STATE_STARTING;
3479 skd_soft_reset(skdev);
3480 break;
3481 }
3482 mtd = FIT_MXD_CONS(FIT_MTD_FITFW_INIT, 0, 0);
3483 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
3484 skdev->last_mtd = mtd;
3485 break;
3486
3487 case FIT_SR_DRIVE_ONLINE:
3488 skdev->cur_max_queue_depth = skd_max_queue_depth;
3489 if (skdev->cur_max_queue_depth > skdev->dev_max_queue_depth)
3490 skdev->cur_max_queue_depth = skdev->dev_max_queue_depth;
3491
3492 skdev->queue_low_water_mark =
3493 skdev->cur_max_queue_depth * 2 / 3 + 1;
3494 if (skdev->queue_low_water_mark < 1)
3495 skdev->queue_low_water_mark = 1;
3496 pr_info(
3497 "(%s): Queue depth limit=%d dev=%d lowat=%d\n",
3498 skd_name(skdev),
3499 skdev->cur_max_queue_depth,
3500 skdev->dev_max_queue_depth, skdev->queue_low_water_mark);
3501
3502 skd_refresh_device_data(skdev);
3503 break;
3504
3505 case FIT_SR_DRIVE_BUSY:
3506 skdev->state = SKD_DRVR_STATE_BUSY;
3507 skdev->timer_countdown = SKD_BUSY_TIMO;
3508 skd_quiesce_dev(skdev);
3509 break;
3510 case FIT_SR_DRIVE_BUSY_SANITIZE:
3511 /* set timer for 3 seconds, we'll abort any unfinished
3512 * commands after that expires
3513 */
3514 skdev->state = SKD_DRVR_STATE_BUSY_SANITIZE;
3515 skdev->timer_countdown = SKD_TIMER_SECONDS(3);
3516 skd_start_queue(skdev);
3517 break;
3518 case FIT_SR_DRIVE_BUSY_ERASE:
3519 skdev->state = SKD_DRVR_STATE_BUSY_ERASE;
3520 skdev->timer_countdown = SKD_BUSY_TIMO;
3521 break;
3522 case FIT_SR_DRIVE_OFFLINE:
3523 skdev->state = SKD_DRVR_STATE_IDLE;
3524 break;
3525 case FIT_SR_DRIVE_SOFT_RESET:
3526 switch (skdev->state) {
3527 case SKD_DRVR_STATE_STARTING:
3528 case SKD_DRVR_STATE_RESTARTING:
3529 /* Expected by a caller of skd_soft_reset() */
3530 break;
3531 default:
3532 skdev->state = SKD_DRVR_STATE_RESTARTING;
3533 break;
3534 }
3535 break;
3536 case FIT_SR_DRIVE_FW_BOOTING:
3537 VPRINTK(skdev, "ISR FIT_SR_DRIVE_FW_BOOTING %s\n", skdev->name);
3538 skdev->state = SKD_DRVR_STATE_WAIT_BOOT;
3539 skdev->timer_countdown = SKD_WAIT_BOOT_TIMO;
3540 break;
3541
3542 case FIT_SR_DRIVE_DEGRADED:
3543 case FIT_SR_PCIE_LINK_DOWN:
3544 case FIT_SR_DRIVE_NEED_FW_DOWNLOAD:
3545 break;
3546
3547 case FIT_SR_DRIVE_FAULT:
3548 skd_drive_fault(skdev);
3549 skd_recover_requests(skdev, 0);
3550 skd_start_queue(skdev);
3551 break;
3552
3553 /* PCIe bus returned all Fs? */
3554 case 0xFF:
3555 pr_info("(%s): state=0x%x sense=0x%x\n",
3556 skd_name(skdev), state, sense);
3557 skd_drive_disappeared(skdev);
3558 skd_recover_requests(skdev, 0);
3559 skd_start_queue(skdev);
3560 break;
3561 default:
3562 /*
3563 * Uknown FW State. Wait for a state we recognize.
3564 */
3565 break;
3566 }
3567 pr_err("(%s): Driver state %s(%d)=>%s(%d)\n",
3568 skd_name(skdev),
3569 skd_skdev_state_to_str(prev_driver_state), prev_driver_state,
3570 skd_skdev_state_to_str(skdev->state), skdev->state);
3571}
3572
3573static void skd_recover_requests(struct skd_device *skdev, int requeue)
3574{
3575 int i;
3576
3577 for (i = 0; i < skdev->num_req_context; i++) {
3578 struct skd_request_context *skreq = &skdev->skreq_table[i];
3579
3580 if (skreq->state == SKD_REQ_STATE_BUSY) {
3581 skd_log_skreq(skdev, skreq, "recover");
3582
3583 SKD_ASSERT((skreq->id & SKD_ID_INCR) != 0);
3584 if (!skd_bio)
3585 SKD_ASSERT(skreq->req != NULL);
3586 else
3587 SKD_ASSERT(skreq->bio != NULL);
3588
3589 /* Release DMA resources for the request. */
3590 if (skreq->n_sg > 0)
3591 skd_postop_sg_list(skdev, skreq);
3592
3593 if (!skd_bio) {
3594 if (requeue &&
3595 (unsigned long) ++skreq->req->special <
3596 SKD_MAX_RETRIES)
3597 skd_requeue_request(skdev, skreq);
3598 else
3599 skd_end_request(skdev, skreq, -EIO);
3600 } else
3601 skd_end_request(skdev, skreq, -EIO);
3602
3603 if (!skd_bio)
3604 skreq->req = NULL;
3605 else
3606 skreq->bio = NULL;
3607
3608 skreq->state = SKD_REQ_STATE_IDLE;
3609 skreq->id += SKD_ID_INCR;
3610
3611
3612 }
3613 if (i > 0)
3614 skreq[-1].next = skreq;
3615 skreq->next = NULL;
3616 }
3617 skdev->skreq_free_list = skdev->skreq_table;
3618
3619 for (i = 0; i < skdev->num_fitmsg_context; i++) {
3620 struct skd_fitmsg_context *skmsg = &skdev->skmsg_table[i];
3621
3622 if (skmsg->state == SKD_MSG_STATE_BUSY) {
3623 skd_log_skmsg(skdev, skmsg, "salvaged");
3624 SKD_ASSERT((skmsg->id & SKD_ID_INCR) != 0);
3625 skmsg->state = SKD_MSG_STATE_IDLE;
3626 skmsg->id += SKD_ID_INCR;
3627 }
3628 if (i > 0)
3629 skmsg[-1].next = skmsg;
3630 skmsg->next = NULL;
3631 }
3632 skdev->skmsg_free_list = skdev->skmsg_table;
3633
3634 for (i = 0; i < skdev->n_special; i++) {
3635 struct skd_special_context *skspcl = &skdev->skspcl_table[i];
3636
3637 /* If orphaned, reclaim it because it has already been reported
3638 * to the process as an error (it was just waiting for
3639 * a completion that didn't come, and now it will never come)
3640 * If busy, change to a state that will cause it to error
3641 * out in the wait routine and let it do the normal
3642 * reporting and reclaiming
3643 */
3644 if (skspcl->req.state == SKD_REQ_STATE_BUSY) {
3645 if (skspcl->orphaned) {
3646 DPRINTK(skdev, "orphaned %p\n", skspcl);
3647 skd_release_special(skdev, skspcl);
3648 } else {
3649 DPRINTK(skdev, "not orphaned %p\n", skspcl);
3650 skspcl->req.state = SKD_REQ_STATE_ABORTED;
3651 }
3652 }
3653 }
3654 skdev->skspcl_free_list = skdev->skspcl_table;
3655
3656 for (i = 0; i < SKD_N_TIMEOUT_SLOT; i++)
3657 skdev->timeout_slot[i] = 0;
3658
3659 skdev->in_flight = 0;
3660}
3661
3662static void skd_isr_msg_from_dev(struct skd_device *skdev)
3663{
3664 u32 mfd;
3665 u32 mtd;
3666 u32 data;
3667
3668 mfd = SKD_READL(skdev, FIT_MSG_FROM_DEVICE);
3669
3670 DPRINTK(skdev, "mfd=0x%x last_mtd=0x%x\n", mfd, skdev->last_mtd);
3671
3672 /* ignore any mtd that is an ack for something we didn't send */
3673 if (FIT_MXD_TYPE(mfd) != FIT_MXD_TYPE(skdev->last_mtd))
3674 return;
3675
3676 switch (FIT_MXD_TYPE(mfd)) {
3677 case FIT_MTD_FITFW_INIT:
3678 skdev->proto_ver = FIT_PROTOCOL_MAJOR_VER(mfd);
3679
3680 if (skdev->proto_ver != FIT_PROTOCOL_VERSION_1) {
3681 pr_err("(%s): protocol mismatch\n",
3682 skdev->name);
3683 pr_err("(%s): got=%d support=%d\n",
3684 skdev->name, skdev->proto_ver,
3685 FIT_PROTOCOL_VERSION_1);
3686 pr_err("(%s): please upgrade driver\n",
3687 skdev->name);
3688 skdev->state = SKD_DRVR_STATE_PROTOCOL_MISMATCH;
3689 skd_soft_reset(skdev);
3690 break;
3691 }
3692 mtd = FIT_MXD_CONS(FIT_MTD_GET_CMDQ_DEPTH, 0, 0);
3693 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
3694 skdev->last_mtd = mtd;
3695 break;
3696
3697 case FIT_MTD_GET_CMDQ_DEPTH:
3698 skdev->dev_max_queue_depth = FIT_MXD_DATA(mfd);
3699 mtd = FIT_MXD_CONS(FIT_MTD_SET_COMPQ_DEPTH, 0,
3700 SKD_N_COMPLETION_ENTRY);
3701 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
3702 skdev->last_mtd = mtd;
3703 break;
3704
3705 case FIT_MTD_SET_COMPQ_DEPTH:
3706 SKD_WRITEQ(skdev, skdev->cq_dma_address, FIT_MSG_TO_DEVICE_ARG);
3707 mtd = FIT_MXD_CONS(FIT_MTD_SET_COMPQ_ADDR, 0, 0);
3708 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
3709 skdev->last_mtd = mtd;
3710 break;
3711
3712 case FIT_MTD_SET_COMPQ_ADDR:
3713 skd_reset_skcomp(skdev);
3714 mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_HOST_ID, 0, skdev->devno);
3715 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
3716 skdev->last_mtd = mtd;
3717 break;
3718
3719 case FIT_MTD_CMD_LOG_HOST_ID:
3720 skdev->connect_time_stamp = get_seconds();
3721 data = skdev->connect_time_stamp & 0xFFFF;
3722 mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_TIME_STAMP_LO, 0, data);
3723 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
3724 skdev->last_mtd = mtd;
3725 break;
3726
3727 case FIT_MTD_CMD_LOG_TIME_STAMP_LO:
3728 skdev->drive_jiffies = FIT_MXD_DATA(mfd);
3729 data = (skdev->connect_time_stamp >> 16) & 0xFFFF;
3730 mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_TIME_STAMP_HI, 0, data);
3731 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
3732 skdev->last_mtd = mtd;
3733 break;
3734
3735 case FIT_MTD_CMD_LOG_TIME_STAMP_HI:
3736 skdev->drive_jiffies |= (FIT_MXD_DATA(mfd) << 16);
3737 mtd = FIT_MXD_CONS(FIT_MTD_ARM_QUEUE, 0, 0);
3738 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
3739 skdev->last_mtd = mtd;
3740
3741 pr_err("(%s): Time sync driver=0x%x device=0x%x\n",
3742 skd_name(skdev),
3743 skdev->connect_time_stamp, skdev->drive_jiffies);
3744 break;
3745
3746 case FIT_MTD_ARM_QUEUE:
3747 skdev->last_mtd = 0;
3748 /*
3749 * State should be, or soon will be, FIT_SR_DRIVE_ONLINE.
3750 */
3751 break;
3752
3753 default:
3754 break;
3755 }
3756}
3757
3758static void skd_disable_interrupts(struct skd_device *skdev)
3759{
3760 u32 sense;
3761
3762 sense = SKD_READL(skdev, FIT_CONTROL);
3763 sense &= ~FIT_CR_ENABLE_INTERRUPTS;
3764 SKD_WRITEL(skdev, sense, FIT_CONTROL);
3765 DPRINTK(skdev, "sense 0x%x\n", sense);
3766
3767 /* Note that the 1s is written. A 1-bit means
3768 * disable, a 0 means enable.
3769 */
3770 SKD_WRITEL(skdev, ~0, FIT_INT_MASK_HOST);
3771}
3772
3773static void skd_enable_interrupts(struct skd_device *skdev)
3774{
3775 u32 val;
3776
3777 /* unmask interrupts first */
3778 val = FIT_ISH_FW_STATE_CHANGE +
3779 FIT_ISH_COMPLETION_POSTED + FIT_ISH_MSG_FROM_DEV;
3780
3781 /* Note that the compliment of mask is written. A 1-bit means
3782 * disable, a 0 means enable. */
3783 SKD_WRITEL(skdev, ~val, FIT_INT_MASK_HOST);
3784 DPRINTK(skdev, "interrupt mask=0x%x\n", ~val);
3785
3786 val = SKD_READL(skdev, FIT_CONTROL);
3787 val |= FIT_CR_ENABLE_INTERRUPTS;
3788 DPRINTK(skdev, "control=0x%x\n", val);
3789 SKD_WRITEL(skdev, val, FIT_CONTROL);
3790}
3791
3792/*
3793 *****************************************************************************
3794 * START, STOP, RESTART, QUIESCE, UNQUIESCE
3795 *****************************************************************************
3796 */
3797
3798static void skd_soft_reset(struct skd_device *skdev)
3799{
3800 u32 val;
3801
3802 val = SKD_READL(skdev, FIT_CONTROL);
3803 val |= (FIT_CR_SOFT_RESET);
3804 DPRINTK(skdev, "control=0x%x\n", val);
3805 SKD_WRITEL(skdev, val, FIT_CONTROL);
3806}
3807
3808static void skd_start_device(struct skd_device *skdev)
3809{
3810 unsigned long flags;
3811 u32 sense;
3812 u32 state;
3813
3814 spin_lock_irqsave(&skdev->lock, flags);
3815
3816 /* ack all ghost interrupts */
3817 SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST);
3818
3819 sense = SKD_READL(skdev, FIT_STATUS);
3820
3821 DPRINTK(skdev, "initial status=0x%x\n", sense);
3822
3823 state = sense & FIT_SR_DRIVE_STATE_MASK;
3824 skdev->drive_state = state;
3825 skdev->last_mtd = 0;
3826
3827 skdev->state = SKD_DRVR_STATE_STARTING;
3828 skdev->timer_countdown = SKD_STARTING_TIMO;
3829
3830 skd_enable_interrupts(skdev);
3831
3832 switch (skdev->drive_state) {
3833 case FIT_SR_DRIVE_OFFLINE:
3834 pr_err("(%s): Drive offline...\n", skd_name(skdev));
3835 break;
3836
3837 case FIT_SR_DRIVE_FW_BOOTING:
3838 VPRINTK(skdev, "FIT_SR_DRIVE_FW_BOOTING %s\n", skdev->name);
3839 skdev->state = SKD_DRVR_STATE_WAIT_BOOT;
3840 skdev->timer_countdown = SKD_WAIT_BOOT_TIMO;
3841 break;
3842
3843 case FIT_SR_DRIVE_BUSY_SANITIZE:
3844 pr_info("(%s): Start: BUSY_SANITIZE\n",
3845 skd_name(skdev));
3846 skdev->state = SKD_DRVR_STATE_BUSY_SANITIZE;
3847 skdev->timer_countdown = SKD_STARTED_BUSY_TIMO;
3848 break;
3849
3850 case FIT_SR_DRIVE_BUSY_ERASE:
3851 pr_info("(%s): Start: BUSY_ERASE\n", skd_name(skdev));
3852 skdev->state = SKD_DRVR_STATE_BUSY_ERASE;
3853 skdev->timer_countdown = SKD_STARTED_BUSY_TIMO;
3854 break;
3855
3856 case FIT_SR_DRIVE_INIT:
3857 case FIT_SR_DRIVE_ONLINE:
3858 skd_soft_reset(skdev);
3859 break;
3860
3861 case FIT_SR_DRIVE_BUSY:
3862 pr_err("(%s): Drive Busy...\n", skd_name(skdev));
3863 skdev->state = SKD_DRVR_STATE_BUSY;
3864 skdev->timer_countdown = SKD_STARTED_BUSY_TIMO;
3865 break;
3866
3867 case FIT_SR_DRIVE_SOFT_RESET:
3868 pr_err("(%s) drive soft reset in prog\n",
3869 skd_name(skdev));
3870 break;
3871
3872 case FIT_SR_DRIVE_FAULT:
3873 /* Fault state is bad...soft reset won't do it...
3874 * Hard reset, maybe, but does it work on device?
3875 * For now, just fault so the system doesn't hang.
3876 */
3877 skd_drive_fault(skdev);
3878 /*start the queue so we can respond with error to requests */
3879 VPRINTK(skdev, "starting %s queue\n", skdev->name);
3880 skd_start_queue(skdev);
3881 skdev->gendisk_on = -1;
3882 wake_up_interruptible(&skdev->waitq);
3883 break;
3884
3885 case 0xFF:
3886 /* Most likely the device isn't there or isn't responding
3887 * to the BAR1 addresses. */
3888 skd_drive_disappeared(skdev);
3889 /*start the queue so we can respond with error to requests */
3890 VPRINTK(skdev, "starting %s queue to error-out reqs\n",
3891 skdev->name);
3892 skd_start_queue(skdev);
3893 skdev->gendisk_on = -1;
3894 wake_up_interruptible(&skdev->waitq);
3895 break;
3896
3897 default:
3898 pr_err("(%s) Start: unknown state %x\n",
3899 skd_name(skdev), skdev->drive_state);
3900 break;
3901 }
3902
3903 state = SKD_READL(skdev, FIT_CONTROL);
3904 DPRINTK(skdev, "FIT Control Status=0x%x\n", state);
3905
3906 state = SKD_READL(skdev, FIT_INT_STATUS_HOST);
3907 DPRINTK(skdev, "Intr Status=0x%x\n", state);
3908
3909 state = SKD_READL(skdev, FIT_INT_MASK_HOST);
3910 DPRINTK(skdev, "Intr Mask=0x%x\n", state);
3911
3912 state = SKD_READL(skdev, FIT_MSG_FROM_DEVICE);
3913 DPRINTK(skdev, "Msg from Dev=0x%x\n", state);
3914
3915 state = SKD_READL(skdev, FIT_HW_VERSION);
3916 DPRINTK(skdev, "HW version=0x%x\n", state);
3917
3918 spin_unlock_irqrestore(&skdev->lock, flags);
3919}
3920
3921static void skd_stop_device(struct skd_device *skdev)
3922{
3923 unsigned long flags;
3924 struct skd_special_context *skspcl = &skdev->internal_skspcl;
3925 u32 dev_state;
3926 int i;
3927
3928 spin_lock_irqsave(&skdev->lock, flags);
3929
3930 if (skdev->state != SKD_DRVR_STATE_ONLINE) {
3931 pr_err("(%s): skd_stop_device not online no sync\n",
3932 skd_name(skdev));
3933 goto stop_out;
3934 }
3935
3936 if (skspcl->req.state != SKD_REQ_STATE_IDLE) {
3937 pr_err("(%s): skd_stop_device no special\n",
3938 skd_name(skdev));
3939 goto stop_out;
3940 }
3941
3942 skdev->state = SKD_DRVR_STATE_SYNCING;
3943 skdev->sync_done = 0;
3944
3945 skd_send_internal_skspcl(skdev, skspcl, SYNCHRONIZE_CACHE);
3946
3947 spin_unlock_irqrestore(&skdev->lock, flags);
3948
3949 wait_event_interruptible_timeout(skdev->waitq,
3950 (skdev->sync_done), (10 * HZ));
3951
3952 spin_lock_irqsave(&skdev->lock, flags);
3953
3954 switch (skdev->sync_done) {
3955 case 0:
3956 pr_err("(%s): skd_stop_device no sync\n",
3957 skd_name(skdev));
3958 break;
3959 case 1:
3960 pr_err("(%s): skd_stop_device sync done\n",
3961 skd_name(skdev));
3962 break;
3963 default:
3964 pr_err("(%s): skd_stop_device sync error\n",
3965 skd_name(skdev));
3966 }
3967
3968stop_out:
3969 skdev->state = SKD_DRVR_STATE_STOPPING;
3970 spin_unlock_irqrestore(&skdev->lock, flags);
3971
3972 skd_kill_timer(skdev);
3973
3974 spin_lock_irqsave(&skdev->lock, flags);
3975 skd_disable_interrupts(skdev);
3976
3977 /* ensure all ints on device are cleared */
3978 /* soft reset the device to unload with a clean slate */
3979 SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST);
3980 SKD_WRITEL(skdev, FIT_CR_SOFT_RESET, FIT_CONTROL);
3981
3982 spin_unlock_irqrestore(&skdev->lock, flags);
3983
3984 /* poll every 100ms, 1 second timeout */
3985 for (i = 0; i < 10; i++) {
3986 dev_state =
3987 SKD_READL(skdev, FIT_STATUS) & FIT_SR_DRIVE_STATE_MASK;
3988 if (dev_state == FIT_SR_DRIVE_INIT)
3989 break;
3990 set_current_state(TASK_INTERRUPTIBLE);
3991 schedule_timeout(msecs_to_jiffies(100));
3992 }
3993
3994 if (dev_state != FIT_SR_DRIVE_INIT)
3995 pr_err("(%s): skd_stop_device state error 0x%02x\n",
3996 skd_name(skdev), dev_state);
3997}
3998
3999/* assume spinlock is held */
4000static void skd_restart_device(struct skd_device *skdev)
4001{
4002 u32 state;
4003
4004 /* ack all ghost interrupts */
4005 SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST);
4006
4007 state = SKD_READL(skdev, FIT_STATUS);
4008
4009 DPRINTK(skdev, "drive status=0x%x\n", state);
4010
4011 state &= FIT_SR_DRIVE_STATE_MASK;
4012 skdev->drive_state = state;
4013 skdev->last_mtd = 0;
4014
4015 skdev->state = SKD_DRVR_STATE_RESTARTING;
4016 skdev->timer_countdown = SKD_RESTARTING_TIMO;
4017
4018 skd_soft_reset(skdev);
4019}
4020
4021/* assume spinlock is held */
4022static int skd_quiesce_dev(struct skd_device *skdev)
4023{
4024 int rc = 0;
4025
4026 switch (skdev->state) {
4027 case SKD_DRVR_STATE_BUSY:
4028 case SKD_DRVR_STATE_BUSY_IMMINENT:
4029 VPRINTK(skdev, "stopping %s queue\n", skdev->name);
4030 skd_stop_queue(skdev);
4031 break;
4032 case SKD_DRVR_STATE_ONLINE:
4033 case SKD_DRVR_STATE_STOPPING:
4034 case SKD_DRVR_STATE_SYNCING:
4035 case SKD_DRVR_STATE_PAUSING:
4036 case SKD_DRVR_STATE_PAUSED:
4037 case SKD_DRVR_STATE_STARTING:
4038 case SKD_DRVR_STATE_RESTARTING:
4039 case SKD_DRVR_STATE_RESUMING:
4040 default:
4041 rc = -EINVAL;
4042 VPRINTK(skdev, "state [%d] not implemented\n", skdev->state);
4043 }
4044 return rc;
4045}
4046
4047/* assume spinlock is held */
4048static int skd_unquiesce_dev(struct skd_device *skdev)
4049{
4050 int prev_driver_state = skdev->state;
4051
4052 skd_log_skdev(skdev, "unquiesce");
4053 if (skdev->state == SKD_DRVR_STATE_ONLINE) {
4054 DPRINTK(skdev, "**** device already ONLINE\n");
4055 return 0;
4056 }
4057 if (skdev->drive_state != FIT_SR_DRIVE_ONLINE) {
4058 /*
4059 * If there has been an state change to other than
4060 * ONLINE, we will rely on controller state change
4061 * to come back online and restart the queue.
4062 * The BUSY state means that driver is ready to
4063 * continue normal processing but waiting for controller
4064 * to become available.
4065 */
4066 skdev->state = SKD_DRVR_STATE_BUSY;
4067 DPRINTK(skdev, "drive BUSY state\n");
4068 return 0;
4069 }
4070
4071 /*
4072 * Drive has just come online, driver is either in startup,
4073 * paused performing a task, or bust waiting for hardware.
4074 */
4075 switch (skdev->state) {
4076 case SKD_DRVR_STATE_PAUSED:
4077 case SKD_DRVR_STATE_BUSY:
4078 case SKD_DRVR_STATE_BUSY_IMMINENT:
4079 case SKD_DRVR_STATE_BUSY_ERASE:
4080 case SKD_DRVR_STATE_STARTING:
4081 case SKD_DRVR_STATE_RESTARTING:
4082 case SKD_DRVR_STATE_FAULT:
4083 case SKD_DRVR_STATE_IDLE:
4084 case SKD_DRVR_STATE_LOAD:
4085 skdev->state = SKD_DRVR_STATE_ONLINE;
4086 pr_err("(%s): Driver state %s(%d)=>%s(%d)\n",
4087 skd_name(skdev),
4088 skd_skdev_state_to_str(prev_driver_state),
4089 prev_driver_state, skd_skdev_state_to_str(skdev->state),
4090 skdev->state);
4091 DPRINTK(skdev, "**** device ONLINE...starting block queue\n");
4092 VPRINTK(skdev, "starting %s queue\n", skdev->name);
4093 pr_info("(%s): STEC s1120 ONLINE\n", skd_name(skdev));
4094 skd_start_queue(skdev);
4095 skdev->gendisk_on = 1;
4096 wake_up_interruptible(&skdev->waitq);
4097 break;
4098
4099 case SKD_DRVR_STATE_DISAPPEARED:
4100 default:
4101 DPRINTK(skdev, "**** driver state %d, not implemented \n",
4102 skdev->state);
4103 return -EBUSY;
4104 }
4105 return 0;
4106}
4107
4108/*
4109 *****************************************************************************
4110 * PCIe MSI/MSI-X INTERRUPT HANDLERS
4111 *****************************************************************************
4112 */
4113
4114static irqreturn_t skd_reserved_isr(int irq, void *skd_host_data)
4115{
4116 struct skd_device *skdev = skd_host_data;
4117 unsigned long flags;
4118
4119 spin_lock_irqsave(&skdev->lock, flags);
4120 VPRINTK(skdev, "MSIX = 0x%x\n", SKD_READL(skdev, FIT_INT_STATUS_HOST));
4121 pr_err("(%s): MSIX reserved irq %d = 0x%x\n", skd_name(skdev),
4122 irq, SKD_READL(skdev, FIT_INT_STATUS_HOST));
4123 SKD_WRITEL(skdev, FIT_INT_RESERVED_MASK, FIT_INT_STATUS_HOST);
4124 spin_unlock_irqrestore(&skdev->lock, flags);
4125 return IRQ_HANDLED;
4126}
4127
4128static irqreturn_t skd_statec_isr(int irq, void *skd_host_data)
4129{
4130 struct skd_device *skdev = skd_host_data;
4131 unsigned long flags;
4132
4133 spin_lock_irqsave(&skdev->lock, flags);
4134 VPRINTK(skdev, "MSIX = 0x%x\n", SKD_READL(skdev, FIT_INT_STATUS_HOST));
4135 SKD_WRITEL(skdev, FIT_ISH_FW_STATE_CHANGE, FIT_INT_STATUS_HOST);
4136 skd_isr_fwstate(skdev);
4137 spin_unlock_irqrestore(&skdev->lock, flags);
4138 return IRQ_HANDLED;
4139}
4140
4141static irqreturn_t skd_comp_q(int irq, void *skd_host_data)
4142{
4143 struct skd_device *skdev = skd_host_data;
4144 unsigned long flags;
4145 int flush_enqueued = 0;
4146 int deferred;
4147
4148 spin_lock_irqsave(&skdev->lock, flags);
4149 VPRINTK(skdev, "MSIX = 0x%x\n", SKD_READL(skdev, FIT_INT_STATUS_HOST));
4150 SKD_WRITEL(skdev, FIT_ISH_COMPLETION_POSTED, FIT_INT_STATUS_HOST);
4151 deferred = skd_isr_completion_posted(skdev, skd_isr_comp_limit,
4152 &flush_enqueued);
4153
4154 if (flush_enqueued)
4155 skd_request_fn(skdev->queue);
4156
4157 if (deferred)
4158 schedule_work(&skdev->completion_worker);
4159 else if (!flush_enqueued)
4160 skd_request_fn(skdev->queue);
4161
4162 spin_unlock_irqrestore(&skdev->lock, flags);
4163
4164 return IRQ_HANDLED;
4165}
4166
4167static irqreturn_t skd_msg_isr(int irq, void *skd_host_data)
4168{
4169 struct skd_device *skdev = skd_host_data;
4170 unsigned long flags;
4171
4172 spin_lock_irqsave(&skdev->lock, flags);
4173 VPRINTK(skdev, "MSIX = 0x%x\n", SKD_READL(skdev, FIT_INT_STATUS_HOST));
4174 SKD_WRITEL(skdev, FIT_ISH_MSG_FROM_DEV, FIT_INT_STATUS_HOST);
4175 skd_isr_msg_from_dev(skdev);
4176 spin_unlock_irqrestore(&skdev->lock, flags);
4177 return IRQ_HANDLED;
4178}
4179
4180static irqreturn_t skd_qfull_isr(int irq, void *skd_host_data)
4181{
4182 struct skd_device *skdev = skd_host_data;
4183 unsigned long flags;
4184
4185 spin_lock_irqsave(&skdev->lock, flags);
4186 VPRINTK(skdev, "MSIX = 0x%x\n", SKD_READL(skdev, FIT_INT_STATUS_HOST));
4187 SKD_WRITEL(skdev, FIT_INT_QUEUE_FULL, FIT_INT_STATUS_HOST);
4188 spin_unlock_irqrestore(&skdev->lock, flags);
4189 return IRQ_HANDLED;
4190}
4191
4192/*
4193 *****************************************************************************
4194 * PCIe MSI/MSI-X SETUP
4195 *****************************************************************************
4196 */
4197
4198struct skd_msix_entry {
4199 int have_irq;
4200 u32 vector;
4201 u32 entry;
4202 struct skd_device *rsp;
4203 char isr_name[30];
4204};
4205
4206struct skd_init_msix_entry {
4207 const char *name;
4208 irq_handler_t handler;
4209};
4210
4211#define SKD_MAX_MSIX_COUNT 13
4212#define SKD_MIN_MSIX_COUNT 7
4213#define SKD_BASE_MSIX_IRQ 4
4214
4215static struct skd_init_msix_entry msix_entries[SKD_MAX_MSIX_COUNT] = {
4216 { "(DMA 0)", skd_reserved_isr },
4217 { "(DMA 1)", skd_reserved_isr },
4218 { "(DMA 2)", skd_reserved_isr },
4219 { "(DMA 3)", skd_reserved_isr },
4220 { "(State Change)", skd_statec_isr },
4221 { "(COMPL_Q)", skd_comp_q },
4222 { "(MSG)", skd_msg_isr },
4223 { "(Reserved)", skd_reserved_isr },
4224 { "(Reserved)", skd_reserved_isr },
4225 { "(Queue Full 0)", skd_qfull_isr },
4226 { "(Queue Full 1)", skd_qfull_isr },
4227 { "(Queue Full 2)", skd_qfull_isr },
4228 { "(Queue Full 3)", skd_qfull_isr },
4229};
4230
4231static void skd_release_msix(struct skd_device *skdev)
4232{
4233 struct skd_msix_entry *qentry;
4234 int i;
4235
4236 if (skdev->msix_entries == NULL)
4237 return;
4238 for (i = 0; i < skdev->msix_count; i++) {
4239 qentry = &skdev->msix_entries[i];
4240 skdev = qentry->rsp;
4241
4242 if (qentry->have_irq)
4243 devm_free_irq(&skdev->pdev->dev,
4244 qentry->vector, qentry->rsp);
4245 }
4246 pci_disable_msix(skdev->pdev);
4247 kfree(skdev->msix_entries);
4248 skdev->msix_count = 0;
4249 skdev->msix_entries = NULL;
4250}
4251
4252static int skd_acquire_msix(struct skd_device *skdev)
4253{
4254 int i, rc;
4255 struct pci_dev *pdev;
4256 struct msix_entry *entries = NULL;
4257 struct skd_msix_entry *qentry;
4258
4259 pdev = skdev->pdev;
4260 skdev->msix_count = SKD_MAX_MSIX_COUNT;
4261 entries = kzalloc(sizeof(struct msix_entry) * SKD_MAX_MSIX_COUNT,
4262 GFP_KERNEL);
4263 if (!entries)
4264 return -ENOMEM;
4265
4266 for (i = 0; i < SKD_MAX_MSIX_COUNT; i++)
4267 entries[i].entry = i;
4268
4269 rc = pci_enable_msix(pdev, entries, SKD_MAX_MSIX_COUNT);
4270 if (rc < 0)
4271 goto msix_out;
4272 if (rc) {
4273 if (rc < SKD_MIN_MSIX_COUNT) {
4274 pr_err("(%s): failed to enable MSI-X %d\n",
4275 skd_name(skdev), rc);
4276 goto msix_out;
4277 }
4278 DPRINTK(skdev, "%s: <%s> allocated %d MSI-X vectors\n",
4279 pci_name(pdev), skdev->name, rc);
4280
4281 skdev->msix_count = rc;
4282 rc = pci_enable_msix(pdev, entries, skdev->msix_count);
4283 if (rc) {
4284 pr_err("(%s): failed to enable MSI-X "
4285 "support (%d) %d\n",
4286 skd_name(skdev), skdev->msix_count, rc);
4287 goto msix_out;
4288 }
4289 }
4290 skdev->msix_entries = kzalloc(sizeof(struct skd_msix_entry) *
4291 skdev->msix_count, GFP_KERNEL);
4292 if (!skdev->msix_entries) {
4293 rc = -ENOMEM;
4294 skdev->msix_count = 0;
4295 pr_err("(%s): msix table allocation error\n",
4296 skd_name(skdev));
4297 goto msix_out;
4298 }
4299
4300 qentry = skdev->msix_entries;
4301 for (i = 0; i < skdev->msix_count; i++) {
4302 qentry->vector = entries[i].vector;
4303 qentry->entry = entries[i].entry;
4304 qentry->rsp = NULL;
4305 qentry->have_irq = 0;
4306 DPRINTK(skdev, "%s: <%s> msix (%d) vec %d, entry %x\n",
4307 pci_name(pdev), skdev->name,
4308 i, qentry->vector, qentry->entry);
4309 qentry++;
4310 }
4311
4312 /* Enable MSI-X vectors for the base queue */
4313 for (i = 0; i < SKD_MAX_MSIX_COUNT; i++) {
4314 qentry = &skdev->msix_entries[i];
4315 snprintf(qentry->isr_name, sizeof(qentry->isr_name),
4316 "%s%d-msix %s", DRV_NAME, skdev->devno,
4317 msix_entries[i].name);
4318 rc = devm_request_irq(&skdev->pdev->dev, qentry->vector,
4319 msix_entries[i].handler, 0,
4320 qentry->isr_name, skdev);
4321 if (rc) {
4322 pr_err("(%s): Unable to register(%d) MSI-X "
4323 "handler %d: %s\n",
4324 skd_name(skdev), rc, i, qentry->isr_name);
4325 goto msix_out;
4326 } else {
4327 qentry->have_irq = 1;
4328 qentry->rsp = skdev;
4329 }
4330 }
4331 DPRINTK(skdev, "%s: <%s> msix %d irq(s) enabled\n",
4332 pci_name(pdev), skdev->name, skdev->msix_count);
4333 return 0;
4334
4335msix_out:
4336 if (entries)
4337 kfree(entries);
4338 skd_release_msix(skdev);
4339 return rc;
4340}
4341
4342static int skd_acquire_irq(struct skd_device *skdev)
4343{
4344 int rc;
4345 struct pci_dev *pdev;
4346
4347 pdev = skdev->pdev;
4348 skdev->msix_count = 0;
4349
4350RETRY_IRQ_TYPE:
4351 switch (skdev->irq_type) {
4352 case SKD_IRQ_MSIX:
4353 rc = skd_acquire_msix(skdev);
4354 if (!rc)
4355 pr_info("(%s): MSI-X %d irqs enabled\n",
4356 skd_name(skdev), skdev->msix_count);
4357 else {
4358 pr_err(
4359 "(%s): failed to enable MSI-X, re-trying with MSI %d\n",
4360 skd_name(skdev), rc);
4361 skdev->irq_type = SKD_IRQ_MSI;
4362 goto RETRY_IRQ_TYPE;
4363 }
4364 break;
4365 case SKD_IRQ_MSI:
4366 snprintf(skdev->isr_name, sizeof(skdev->isr_name), "%s%d-msi",
4367 DRV_NAME, skdev->devno);
4368 rc = pci_enable_msi(pdev);
4369 if (!rc) {
4370 rc = devm_request_irq(&pdev->dev, pdev->irq, skd_isr, 0,
4371 skdev->isr_name, skdev);
4372 if (rc) {
4373 pci_disable_msi(pdev);
4374 pr_err(
4375 "(%s): failed to allocate the MSI interrupt %d\n",
4376 skd_name(skdev), rc);
4377 goto RETRY_IRQ_LEGACY;
4378 }
4379 pr_info("(%s): MSI irq %d enabled\n",
4380 skd_name(skdev), pdev->irq);
4381 } else {
4382RETRY_IRQ_LEGACY:
4383 pr_err(
4384 "(%s): failed to enable MSI, re-trying with LEGACY %d\n",
4385 skd_name(skdev), rc);
4386 skdev->irq_type = SKD_IRQ_LEGACY;
4387 goto RETRY_IRQ_TYPE;
4388 }
4389 break;
4390 case SKD_IRQ_LEGACY:
4391 snprintf(skdev->isr_name, sizeof(skdev->isr_name),
4392 "%s%d-legacy", DRV_NAME, skdev->devno);
4393 rc = devm_request_irq(&pdev->dev, pdev->irq, skd_isr,
4394 IRQF_SHARED, skdev->isr_name, skdev);
4395 if (!rc)
4396 pr_info("(%s): LEGACY irq %d enabled\n",
4397 skd_name(skdev), pdev->irq);
4398 else
4399 pr_err("(%s): request LEGACY irq error %d\n",
4400 skd_name(skdev), rc);
4401 break;
4402 default:
4403 pr_info("(%s): irq_type %d invalid, re-set to %d\n",
4404 skd_name(skdev), skdev->irq_type, SKD_IRQ_DEFAULT);
4405 skdev->irq_type = SKD_IRQ_LEGACY;
4406 goto RETRY_IRQ_TYPE;
4407 }
4408 return rc;
4409}
4410
4411static void skd_release_irq(struct skd_device *skdev)
4412{
4413 switch (skdev->irq_type) {
4414 case SKD_IRQ_MSIX:
4415 skd_release_msix(skdev);
4416 break;
4417 case SKD_IRQ_MSI:
4418 devm_free_irq(&skdev->pdev->dev, skdev->pdev->irq, skdev);
4419 pci_disable_msi(skdev->pdev);
4420 break;
4421 case SKD_IRQ_LEGACY:
4422 devm_free_irq(&skdev->pdev->dev, skdev->pdev->irq, skdev);
4423 break;
4424 default:
4425 pr_err("(%s): wrong irq type %d!",
4426 skd_name(skdev), skdev->irq_type);
4427 break;
4428 }
4429}
4430
4431/*
4432 *****************************************************************************
4433 * CONSTRUCT
4434 *****************************************************************************
4435 */
4436
4437static int skd_cons_skcomp(struct skd_device *skdev);
4438static int skd_cons_skmsg(struct skd_device *skdev);
4439static int skd_cons_skreq(struct skd_device *skdev);
4440static int skd_cons_skspcl(struct skd_device *skdev);
4441static int skd_cons_sksb(struct skd_device *skdev);
4442static struct fit_sg_descriptor *skd_cons_sg_list(struct skd_device *skdev,
4443 u32 n_sg,
4444 dma_addr_t *ret_dma_addr);
4445static int skd_cons_disk(struct skd_device *skdev);
4446
4447#define SKD_N_DEV_TABLE 16u
4448static u32 skd_next_devno;
4449
4450static struct skd_device *skd_construct(struct pci_dev *pdev)
4451{
4452 struct skd_device *skdev;
4453 int blk_major = skd_major;
4454 int rc;
4455
4456 skdev = kzalloc(sizeof(*skdev), GFP_KERNEL);
4457
4458 if (!skdev) {
4459 pr_err(PFX "(%s): memory alloc failure\n",
4460 pci_name(pdev));
4461 return NULL;
4462 }
4463
4464 skdev->state = SKD_DRVR_STATE_LOAD;
4465 skdev->pdev = pdev;
4466 skdev->devno = skd_next_devno++;
4467 skdev->major = blk_major;
4468 skdev->irq_type = skd_isr_type;
4469 sprintf(skdev->name, DRV_NAME "%d", skdev->devno);
4470 skdev->dev_max_queue_depth = 0;
4471
4472 skdev->num_req_context = skd_max_queue_depth;
4473 skdev->num_fitmsg_context = skd_max_queue_depth;
4474 skdev->n_special = skd_max_pass_thru;
4475 skdev->cur_max_queue_depth = 1;
4476 skdev->queue_low_water_mark = 1;
4477 skdev->proto_ver = 99;
4478 skdev->sgs_per_request = skd_sgs_per_request;
4479 skdev->dbg_level = skd_dbg_level;
4480
4481 if (skd_bio)
4482 bio_list_init(&skdev->bio_queue);
4483
4484
4485 atomic_set(&skdev->device_count, 0);
4486
4487 spin_lock_init(&skdev->lock);
4488
4489 INIT_WORK(&skdev->completion_worker, skd_completion_worker);
4490 INIT_LIST_HEAD(&skdev->flush_list);
4491
4492 VPRINTK(skdev, "skcomp\n");
4493 rc = skd_cons_skcomp(skdev);
4494 if (rc < 0)
4495 goto err_out;
4496
4497 VPRINTK(skdev, "skmsg\n");
4498 rc = skd_cons_skmsg(skdev);
4499 if (rc < 0)
4500 goto err_out;
4501
4502 VPRINTK(skdev, "skreq\n");
4503 rc = skd_cons_skreq(skdev);
4504 if (rc < 0)
4505 goto err_out;
4506
4507 VPRINTK(skdev, "skspcl\n");
4508 rc = skd_cons_skspcl(skdev);
4509 if (rc < 0)
4510 goto err_out;
4511
4512 VPRINTK(skdev, "sksb\n");
4513 rc = skd_cons_sksb(skdev);
4514 if (rc < 0)
4515 goto err_out;
4516
4517 VPRINTK(skdev, "disk\n");
4518 rc = skd_cons_disk(skdev);
4519 if (rc < 0)
4520 goto err_out;
4521
4522
4523
4524 DPRINTK(skdev, "VICTORY\n");
4525 return skdev;
4526
4527err_out:
4528 DPRINTK(skdev, "construct failed\n");
4529 skd_destruct(skdev);
4530 return NULL;
4531}
4532
4533static int skd_cons_skcomp(struct skd_device *skdev)
4534{
4535 int rc = 0;
4536 struct fit_completion_entry_v1 *skcomp;
4537 u32 nbytes;
4538
4539 nbytes = sizeof(*skcomp) * SKD_N_COMPLETION_ENTRY;
4540 nbytes += sizeof(struct fit_comp_error_info) * SKD_N_COMPLETION_ENTRY;
4541
4542 VPRINTK(skdev, "comp pci_alloc, total bytes %d entries %d\n", nbytes,
4543 SKD_N_COMPLETION_ENTRY);
4544
4545 skcomp = pci_alloc_consistent(skdev->pdev, nbytes,
4546 &skdev->cq_dma_address);
4547
4548 if (skcomp == NULL) {
4549 rc = -ENOMEM;
4550 goto err_out;
4551 }
4552
4553 memset(skcomp, 0, nbytes);
4554
4555 skdev->skcomp_table = skcomp;
4556 skdev->skerr_table = (struct fit_comp_error_info *)((char *)skcomp +
4557 sizeof(*skcomp) *
4558 SKD_N_COMPLETION_ENTRY);
4559
4560err_out:
4561 return rc;
4562}
4563
4564static int skd_cons_skmsg(struct skd_device *skdev)
4565{
4566 int rc = 0;
4567 u32 i;
4568
f721bb0d 4569 VPRINTK(skdev, "skmsg_table kzalloc, struct %lu, count %u total %lu\n",
e67f86b3
AB		 4570 sizeof(struct skd_fitmsg_context),
4571 skdev->num_fitmsg_context,
f721bb0d 4572 sizeof(struct skd_fitmsg_context) * skdev->num_fitmsg_context);
e67f86b3
AB		 4573
4574 skdev->skmsg_table = kzalloc(sizeof(struct skd_fitmsg_context)
4575 *skdev->num_fitmsg_context, GFP_KERNEL);
4576 if (skdev->skmsg_table == NULL) {
4577 rc = -ENOMEM;
4578 goto err_out;
4579 }
4580
4581 for (i = 0; i < skdev->num_fitmsg_context; i++) {
4582 struct skd_fitmsg_context *skmsg;
4583
4584 skmsg = &skdev->skmsg_table[i];
4585
4586 skmsg->id = i + SKD_ID_FIT_MSG;
4587
4588 skmsg->state = SKD_MSG_STATE_IDLE;
4589 skmsg->msg_buf = pci_alloc_consistent(skdev->pdev,
4590 SKD_N_FITMSG_BYTES + 64,
4591 &skmsg->mb_dma_address);
4592
4593 if (skmsg->msg_buf == NULL) {
4594 rc = -ENOMEM;
4595 goto err_out;
4596 }
4597
4598 skmsg->offset = (u32)((u64)skmsg->msg_buf &
4599 (~FIT_QCMD_BASE_ADDRESS_MASK));
4600 skmsg->msg_buf += ~FIT_QCMD_BASE_ADDRESS_MASK;
4601 skmsg->msg_buf = (u8 *)((u64)skmsg->msg_buf &
4602 FIT_QCMD_BASE_ADDRESS_MASK);
4603 skmsg->mb_dma_address += ~FIT_QCMD_BASE_ADDRESS_MASK;
4604 skmsg->mb_dma_address &= FIT_QCMD_BASE_ADDRESS_MASK;
4605 memset(skmsg->msg_buf, 0, SKD_N_FITMSG_BYTES);
4606
4607 skmsg->next = &skmsg[1];
4608 }
4609
4610 /* Free list is in order starting with the 0th entry. */
4611 skdev->skmsg_table[i - 1].next = NULL;
4612 skdev->skmsg_free_list = skdev->skmsg_table;
4613
4614err_out:
4615 return rc;
4616}
4617
4618static int skd_cons_skreq(struct skd_device *skdev)
4619{
4620 int rc = 0;
4621 u32 i;
4622
f721bb0d 4623 VPRINTK(skdev, "skreq_table kzalloc, struct %lu, count %u total %lu\n",
e67f86b3
AB		 4624 sizeof(struct skd_request_context),
4625 skdev->num_req_context,
4626 sizeof(struct skd_request_context) * skdev->num_req_context);
4627
4628 skdev->skreq_table = kzalloc(sizeof(struct skd_request_context)
4629 * skdev->num_req_context, GFP_KERNEL);
4630 if (skdev->skreq_table == NULL) {
4631 rc = -ENOMEM;
4632 goto err_out;
4633 }
4634
f721bb0d 4635 VPRINTK(skdev, "alloc sg_table sg_per_req %u scatlist %lu total %lu\n",
e67f86b3
AB		 4636 skdev->sgs_per_request, sizeof(struct scatterlist),
4637 skdev->sgs_per_request * sizeof(struct scatterlist));
4638
4639 for (i = 0; i < skdev->num_req_context; i++) {
4640 struct skd_request_context *skreq;
4641
4642 skreq = &skdev->skreq_table[i];
4643
4644 skreq->id = i + SKD_ID_RW_REQUEST;
4645 skreq->state = SKD_REQ_STATE_IDLE;
4646
4647 skreq->sg = kzalloc(sizeof(struct scatterlist) *
4648 skdev->sgs_per_request, GFP_KERNEL);
4649 if (skreq->sg == NULL) {
4650 rc = -ENOMEM;
4651 goto err_out;
4652 }
4653 sg_init_table(skreq->sg, skdev->sgs_per_request);
4654
4655 skreq->sksg_list = skd_cons_sg_list(skdev,
4656 skdev->sgs_per_request,
4657 &skreq->sksg_dma_address);
4658
4659 if (skreq->sksg_list == NULL) {
4660 rc = -ENOMEM;
4661 goto err_out;
4662 }
4663
4664 skreq->next = &skreq[1];
4665 }
4666
4667 /* Free list is in order starting with the 0th entry. */
4668 skdev->skreq_table[i - 1].next = NULL;
4669 skdev->skreq_free_list = skdev->skreq_table;
4670
4671err_out:
4672 return rc;
4673}
4674
4675static int skd_cons_skspcl(struct skd_device *skdev)
4676{
4677 int rc = 0;
4678 u32 i, nbytes;
4679
f721bb0d 4680 VPRINTK(skdev, "skspcl_table kzalloc, struct %lu, count %u total %lu\n",
e67f86b3
AB		 4681 sizeof(struct skd_special_context),
4682 skdev->n_special,
4683 sizeof(struct skd_special_context) * skdev->n_special);
4684
4685 skdev->skspcl_table = kzalloc(sizeof(struct skd_special_context)
4686 * skdev->n_special, GFP_KERNEL);
4687 if (skdev->skspcl_table == NULL) {
4688 rc = -ENOMEM;
4689 goto err_out;
4690 }
4691
4692 for (i = 0; i < skdev->n_special; i++) {
4693 struct skd_special_context *skspcl;
4694
4695 skspcl = &skdev->skspcl_table[i];
4696
4697 skspcl->req.id = i + SKD_ID_SPECIAL_REQUEST;
4698 skspcl->req.state = SKD_REQ_STATE_IDLE;
4699
4700 skspcl->req.next = &skspcl[1].req;
4701
4702 nbytes = SKD_N_SPECIAL_FITMSG_BYTES;
4703
4704 skspcl->msg_buf = pci_alloc_consistent(skdev->pdev, nbytes,
4705 &skspcl->mb_dma_address);
4706 if (skspcl->msg_buf == NULL) {
4707 rc = -ENOMEM;
4708 goto err_out;
4709 }
4710
4711 memset(skspcl->msg_buf, 0, nbytes);
4712
4713 skspcl->req.sg = kzalloc(sizeof(struct scatterlist) *
4714 SKD_N_SG_PER_SPECIAL, GFP_KERNEL);
4715 if (skspcl->req.sg == NULL) {
4716 rc = -ENOMEM;
4717 goto err_out;
4718 }
4719
4720 skspcl->req.sksg_list = skd_cons_sg_list(skdev,
4721 SKD_N_SG_PER_SPECIAL,
4722 &skspcl->req.
4723 sksg_dma_address);
4724 if (skspcl->req.sksg_list == NULL) {
4725 rc = -ENOMEM;
4726 goto err_out;
4727 }
4728 }
4729
4730 /* Free list is in order starting with the 0th entry. */
4731 skdev->skspcl_table[i - 1].req.next = NULL;
4732 skdev->skspcl_free_list = skdev->skspcl_table;
4733
4734 return rc;
4735
4736err_out:
4737 return rc;
4738}
4739
4740static int skd_cons_sksb(struct skd_device *skdev)
4741{
4742 int rc = 0;
4743 struct skd_special_context *skspcl;
4744 u32 nbytes;
4745
4746 skspcl = &skdev->internal_skspcl;
4747
4748 skspcl->req.id = 0 + SKD_ID_INTERNAL;
4749 skspcl->req.state = SKD_REQ_STATE_IDLE;
4750
4751 nbytes = SKD_N_INTERNAL_BYTES;
4752
4753 skspcl->data_buf = pci_alloc_consistent(skdev->pdev, nbytes,
4754 &skspcl->db_dma_address);
4755 if (skspcl->data_buf == NULL) {
4756 rc = -ENOMEM;
4757 goto err_out;
4758 }
4759
4760 memset(skspcl->data_buf, 0, nbytes);
4761
4762 nbytes = SKD_N_SPECIAL_FITMSG_BYTES;
4763 skspcl->msg_buf = pci_alloc_consistent(skdev->pdev, nbytes,
4764 &skspcl->mb_dma_address);
4765 if (skspcl->msg_buf == NULL) {
4766 rc = -ENOMEM;
4767 goto err_out;
4768 }
4769
4770 memset(skspcl->msg_buf, 0, nbytes);
4771
4772 skspcl->req.sksg_list = skd_cons_sg_list(skdev, 1,
4773 &skspcl->req.sksg_dma_address);
4774 if (skspcl->req.sksg_list == NULL) {
4775 rc = -ENOMEM;
4776 goto err_out;
4777 }
4778
4779 if (!skd_format_internal_skspcl(skdev)) {
4780 rc = -EINVAL;
4781 goto err_out;
4782 }
4783
4784err_out:
4785 return rc;
4786}
4787
4788static struct fit_sg_descriptor *skd_cons_sg_list(struct skd_device *skdev,
4789 u32 n_sg,
4790 dma_addr_t *ret_dma_addr)
4791{
4792 struct fit_sg_descriptor *sg_list;
4793 u32 nbytes;
4794
4795 nbytes = sizeof(*sg_list) * n_sg;
4796
4797 sg_list = pci_alloc_consistent(skdev->pdev, nbytes, ret_dma_addr);
4798
4799 if (sg_list != NULL) {
4800 uint64_t dma_address = *ret_dma_addr;
4801 u32 i;
4802
4803 memset(sg_list, 0, nbytes);
4804
4805 for (i = 0; i < n_sg - 1; i++) {
4806 uint64_t ndp_off;
4807 ndp_off = (i + 1) * sizeof(struct fit_sg_descriptor);
4808
4809 sg_list[i].next_desc_ptr = dma_address + ndp_off;
4810 }
4811 sg_list[i].next_desc_ptr = 0LL;
4812 }
4813
4814 return sg_list;
4815}
4816
4817static int skd_cons_disk(struct skd_device *skdev)
4818{
4819 int rc = 0;
4820 struct gendisk *disk;
4821 struct request_queue *q;
4822 unsigned long flags;
4823
4824 disk = alloc_disk(SKD_MINORS_PER_DEVICE);
4825 if (!disk) {
4826 rc = -ENOMEM;
4827 goto err_out;
4828 }
4829
4830 skdev->disk = disk;
4831 sprintf(disk->disk_name, DRV_NAME "%u", skdev->devno);
4832
4833 disk->major = skdev->major;
4834 disk->first_minor = skdev->devno * SKD_MINORS_PER_DEVICE;
4835 disk->fops = &skd_blockdev_ops;
4836 disk->private_data = skdev;
4837
4838 if (!skd_bio) {
4839 q = blk_init_queue(skd_request_fn, &skdev->lock);
4840 } else {
4841 q = blk_alloc_queue(GFP_KERNEL);
4842 q->queue_flags = QUEUE_FLAG_IO_STAT | QUEUE_FLAG_STACKABLE;
4843 }
4844
4845 if (!q) {
4846 rc = -ENOMEM;
4847 goto err_out;
4848 }
4849
4850 skdev->queue = q;
4851 disk->queue = q;
4852 q->queuedata = skdev;
4853
4854 if (skd_bio) {
4855 q->queue_lock = &skdev->lock;
4856 blk_queue_make_request(q, skd_make_request);
4857 }
4858
4859 blk_queue_flush(q, REQ_FLUSH | REQ_FUA);
4860 blk_queue_max_segments(q, skdev->sgs_per_request);
4861 blk_queue_max_hw_sectors(q, SKD_N_MAX_SECTORS);
4862
4863 /* set sysfs ptimal_io_size to 8K */
4864 blk_queue_io_opt(q, 8192);
4865
4866 /* DISCARD Flag initialization. */
4867 q->limits.discard_granularity = 8192;
4868 q->limits.discard_alignment = 0;
4869 q->limits.max_discard_sectors = UINT_MAX >> 9;
4870 q->limits.discard_zeroes_data = 1;
4871 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
4872 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
4873
4874 spin_lock_irqsave(&skdev->lock, flags);
4875 VPRINTK(skdev, "stopping %s queue\n", skdev->name);
4876 skd_stop_queue(skdev);
4877 spin_unlock_irqrestore(&skdev->lock, flags);
4878
4879err_out:
4880 return rc;
4881}
4882
4883/*
4884 *****************************************************************************
4885 * DESTRUCT (FREE)
4886 *****************************************************************************
4887 */
4888
4889static void skd_free_skcomp(struct skd_device *skdev);
4890static void skd_free_skmsg(struct skd_device *skdev);
4891static void skd_free_skreq(struct skd_device *skdev);
4892static void skd_free_skspcl(struct skd_device *skdev);
4893static void skd_free_sksb(struct skd_device *skdev);
4894static void skd_free_sg_list(struct skd_device *skdev,
4895 struct fit_sg_descriptor *sg_list,
4896 u32 n_sg, dma_addr_t dma_addr);
4897static void skd_free_disk(struct skd_device *skdev);
4898
4899static void skd_destruct(struct skd_device *skdev)
4900{
4901 if (skdev == NULL)
4902 return;
4903
4904
4905 VPRINTK(skdev, "disk\n");
4906 skd_free_disk(skdev);
4907
4908 VPRINTK(skdev, "sksb\n");
4909 skd_free_sksb(skdev);
4910
4911 VPRINTK(skdev, "skspcl\n");
4912 skd_free_skspcl(skdev);
4913
4914 VPRINTK(skdev, "skreq\n");
4915 skd_free_skreq(skdev);
4916
4917 VPRINTK(skdev, "skmsg\n");
4918 skd_free_skmsg(skdev);
4919
4920 VPRINTK(skdev, "skcomp\n");
4921 skd_free_skcomp(skdev);
4922
4923 VPRINTK(skdev, "skdev\n");
4924 kfree(skdev);
4925}
4926
4927static void skd_free_skcomp(struct skd_device *skdev)
4928{
4929 if (skdev->skcomp_table != NULL) {
4930 u32 nbytes;
4931
4932 nbytes = sizeof(skdev->skcomp_table[0]) *
4933 SKD_N_COMPLETION_ENTRY;
4934 pci_free_consistent(skdev->pdev, nbytes,
4935 skdev->skcomp_table, skdev->cq_dma_address);
4936 }
4937
4938 skdev->skcomp_table = NULL;
4939 skdev->cq_dma_address = 0;
4940}
4941
4942static void skd_free_skmsg(struct skd_device *skdev)
4943{
4944 u32 i;
4945
4946 if (skdev->skmsg_table == NULL)
4947 return;
4948
4949 for (i = 0; i < skdev->num_fitmsg_context; i++) {
4950 struct skd_fitmsg_context *skmsg;
4951
4952 skmsg = &skdev->skmsg_table[i];
4953
4954 if (skmsg->msg_buf != NULL) {
4955 skmsg->msg_buf += skmsg->offset;
4956 skmsg->mb_dma_address += skmsg->offset;
4957 pci_free_consistent(skdev->pdev, SKD_N_FITMSG_BYTES,
4958 skmsg->msg_buf,
4959 skmsg->mb_dma_address);
4960 }
4961 skmsg->msg_buf = NULL;
4962 skmsg->mb_dma_address = 0;
4963 }
4964
4965 kfree(skdev->skmsg_table);
4966 skdev->skmsg_table = NULL;
4967}
4968
4969static void skd_free_skreq(struct skd_device *skdev)
4970{
4971 u32 i;
4972
4973 if (skdev->skreq_table == NULL)
4974 return;
4975
4976 for (i = 0; i < skdev->num_req_context; i++) {
4977 struct skd_request_context *skreq;
4978
4979 skreq = &skdev->skreq_table[i];
4980
4981 skd_free_sg_list(skdev, skreq->sksg_list,
4982 skdev->sgs_per_request,
4983 skreq->sksg_dma_address);
4984
4985 skreq->sksg_list = NULL;
4986 skreq->sksg_dma_address = 0;
4987
4988 kfree(skreq->sg);
4989 }
4990
4991 kfree(skdev->skreq_table);
4992 skdev->skreq_table = NULL;
4993}
4994
4995static void skd_free_skspcl(struct skd_device *skdev)
4996{
4997 u32 i;
4998 u32 nbytes;
4999
5000 if (skdev->skspcl_table == NULL)
5001 return;
5002
5003 for (i = 0; i < skdev->n_special; i++) {
5004 struct skd_special_context *skspcl;
5005
5006 skspcl = &skdev->skspcl_table[i];
5007
5008 if (skspcl->msg_buf != NULL) {
5009 nbytes = SKD_N_SPECIAL_FITMSG_BYTES;
5010 pci_free_consistent(skdev->pdev, nbytes,
5011 skspcl->msg_buf,
5012 skspcl->mb_dma_address);
5013 }
5014
5015 skspcl->msg_buf = NULL;
5016 skspcl->mb_dma_address = 0;
5017
5018 skd_free_sg_list(skdev, skspcl->req.sksg_list,
5019 SKD_N_SG_PER_SPECIAL,
5020 skspcl->req.sksg_dma_address);
5021
5022 skspcl->req.sksg_list = NULL;
5023 skspcl->req.sksg_dma_address = 0;
5024
5025 kfree(skspcl->req.sg);
5026 }
5027
5028 kfree(skdev->skspcl_table);
5029 skdev->skspcl_table = NULL;
5030}
5031
5032static void skd_free_sksb(struct skd_device *skdev)
5033{
5034 struct skd_special_context *skspcl;
5035 u32 nbytes;
5036
5037 skspcl = &skdev->internal_skspcl;
5038
5039 if (skspcl->data_buf != NULL) {
5040 nbytes = SKD_N_INTERNAL_BYTES;
5041
5042 pci_free_consistent(skdev->pdev, nbytes,
5043 skspcl->data_buf, skspcl->db_dma_address);
5044 }
5045
5046 skspcl->data_buf = NULL;
5047 skspcl->db_dma_address = 0;
5048
5049 if (skspcl->msg_buf != NULL) {
5050 nbytes = SKD_N_SPECIAL_FITMSG_BYTES;
5051 pci_free_consistent(skdev->pdev, nbytes,
5052 skspcl->msg_buf, skspcl->mb_dma_address);
5053 }
5054
5055 skspcl->msg_buf = NULL;
5056 skspcl->mb_dma_address = 0;
5057
5058 skd_free_sg_list(skdev, skspcl->req.sksg_list, 1,
5059 skspcl->req.sksg_dma_address);
5060
5061 skspcl->req.sksg_list = NULL;
5062 skspcl->req.sksg_dma_address = 0;
5063}
5064
5065static void skd_free_sg_list(struct skd_device *skdev,
5066 struct fit_sg_descriptor *sg_list,
5067 u32 n_sg, dma_addr_t dma_addr)
5068{
5069 if (sg_list != NULL) {
5070 u32 nbytes;
5071
5072 nbytes = sizeof(*sg_list) * n_sg;
5073
5074 pci_free_consistent(skdev->pdev, nbytes, sg_list, dma_addr);
5075 }
5076}
5077
5078static void skd_free_disk(struct skd_device *skdev)
5079{
5080 struct gendisk *disk = skdev->disk;
5081
5082 if (disk != NULL) {
5083 struct request_queue *q = disk->queue;
5084
5085 if (disk->flags & GENHD_FL_UP)
5086 del_gendisk(disk);
5087 if (q)
5088 blk_cleanup_queue(q);
5089 put_disk(disk);
5090 }
5091 skdev->disk = NULL;
5092}
5093
5094
5095
5096/*
5097 *****************************************************************************
5098 * BLOCK DEVICE (BDEV) GLUE
5099 *****************************************************************************
5100 */
5101
5102static int skd_bdev_getgeo(struct block_device *bdev, struct hd_geometry *geo)
5103{
5104 struct skd_device *skdev;
5105 u64 capacity;
5106
5107 skdev = bdev->bd_disk->private_data;
5108
5109 DPRINTK(skdev, "%s: CMD[%s] getgeo device\n",
5110 bdev->bd_disk->disk_name, current->comm);
5111
5112 if (skdev->read_cap_is_valid) {
5113 capacity = get_capacity(skdev->disk);
5114 geo->heads = 64;
5115 geo->sectors = 255;
5116 geo->cylinders = (capacity) / (255 * 64);
5117
5118 return 0;
5119 }
5120 return -EIO;
5121}
5122
5123static int skd_bdev_attach(struct skd_device *skdev)
5124{
5125 DPRINTK(skdev, "add_disk\n");
5126 add_disk(skdev->disk);
5127 return 0;
5128}
5129
5130static const struct block_device_operations skd_blockdev_ops = {
5131 .owner = THIS_MODULE,
5132 .ioctl = skd_bdev_ioctl,
5133 .getgeo = skd_bdev_getgeo,
5134};
5135
5136
5137/*
5138 *****************************************************************************
5139 * PCIe DRIVER GLUE
5140 *****************************************************************************
5141 */
5142
5143static DEFINE_PCI_DEVICE_TABLE(skd_pci_tbl) = {
5144 { PCI_VENDOR_ID_STEC, PCI_DEVICE_ID_S1120,
5145 PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
5146 { 0 } /* terminate list */
5147};
5148
5149MODULE_DEVICE_TABLE(pci, skd_pci_tbl);
5150
5151static char *skd_pci_info(struct skd_device *skdev, char *str)
5152{
5153 int pcie_reg;
5154
5155 strcpy(str, "PCIe (");
5156 pcie_reg = pci_find_capability(skdev->pdev, PCI_CAP_ID_EXP);
5157
5158 if (pcie_reg) {
5159
5160 char lwstr[6];
5161 uint16_t pcie_lstat, lspeed, lwidth;
5162
5163 pcie_reg += 0x12;
5164 pci_read_config_word(skdev->pdev, pcie_reg, &pcie_lstat);
5165 lspeed = pcie_lstat & (0xF);
5166 lwidth = (pcie_lstat & 0x3F0) >> 4;
5167
5168 if (lspeed == 1)
5169 strcat(str, "2.5GT/s ");
5170 else if (lspeed == 2)
5171 strcat(str, "5.0GT/s ");
5172 else
5173 strcat(str, "<unknown> ");
5174 snprintf(lwstr, sizeof(lwstr), "%dX)", lwidth);
5175 strcat(str, lwstr);
5176 }
5177 return str;
5178}
5179
5180static int skd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
5181{
5182 int i;
5183 int rc = 0;
5184 char pci_str[32];
5185 struct skd_device *skdev;
5186
5187 pr_info("STEC s1120 Driver(%s) version %s-b%s\n",
5188 DRV_NAME, DRV_VERSION, DRV_BUILD_ID);
5189 pr_info("(skd?:??:[%s]): vendor=%04X device=%04x\n",
5190 pci_name(pdev), pdev->vendor, pdev->device);
5191
5192 rc = pci_enable_device(pdev);
5193 if (rc)
5194 return rc;
5195 rc = pci_request_regions(pdev, DRV_NAME);
5196 if (rc)
5197 goto err_out;
5198 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
5199 if (!rc) {
5200 if (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64))) {
5201
5202 pr_err("(%s): consistent DMA mask error %d\n",
5203 pci_name(pdev), rc);
5204 }
5205 } else {
5206 (rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)));
5207 if (rc) {
5208
5209 pr_err("(%s): DMA mask error %d\n",
5210 pci_name(pdev), rc);
5211 goto err_out_regions;
5212 }
5213 }
5214
5215 skdev = skd_construct(pdev);
5216 if (skdev == NULL)
5217 goto err_out_regions;
5218
5219 skd_pci_info(skdev, pci_str);
5220 pr_info("(%s): %s 64bit\n", skd_name(skdev), pci_str);
5221
5222 pci_set_master(pdev);
5223 rc = pci_enable_pcie_error_reporting(pdev);
5224 if (rc) {
5225 pr_err(
5226 "(%s): bad enable of PCIe error reporting rc=%d\n",
5227 skd_name(skdev), rc);
5228 skdev->pcie_error_reporting_is_enabled = 0;
5229 } else
5230 skdev->pcie_error_reporting_is_enabled = 1;
5231
5232
5233 pci_set_drvdata(pdev, skdev);
5234 skdev->pdev = pdev;
5235 skdev->disk->driverfs_dev = &pdev->dev;
5236
5237 for (i = 0; i < SKD_MAX_BARS; i++) {
5238 skdev->mem_phys[i] = pci_resource_start(pdev, i);
5239 skdev->mem_size[i] = (u32)pci_resource_len(pdev, i);
5240 skdev->mem_map[i] = ioremap(skdev->mem_phys[i],
5241 skdev->mem_size[i]);
5242 if (!skdev->mem_map[i]) {
5243 pr_err("(%s): Unable to map adapter memory!\n",
5244 skd_name(skdev));
5245 rc = -ENODEV;
5246 goto err_out_iounmap;
5247 }
5248 DPRINTK(skdev, "mem_map=%p, phyd=%016llx, size=%d\n",
5249 skdev->mem_map[i],
5250 (uint64_t)skdev->mem_phys[i], skdev->mem_size[i]);
5251 }
5252
5253 rc = skd_acquire_irq(skdev);
5254 if (rc) {
5255 pr_err("(%s): interrupt resource error %d\n",
5256 skd_name(skdev), rc);
5257 goto err_out_iounmap;
5258 }
5259
5260 rc = skd_start_timer(skdev);
5261 if (rc)
5262 goto err_out_timer;
5263
5264 init_waitqueue_head(&skdev->waitq);
5265
5266 skd_start_device(skdev);
5267
5268 rc = wait_event_interruptible_timeout(skdev->waitq,
5269 (skdev->gendisk_on),
5270 (SKD_START_WAIT_SECONDS * HZ));
5271 if (skdev->gendisk_on > 0) {
5272 /* device came on-line after reset */
5273 skd_bdev_attach(skdev);
5274 rc = 0;
5275 } else {
5276 /* we timed out, something is wrong with the device,
5277 don't add the disk structure */
5278 pr_err(
5279 "(%s): error: waiting for s1120 timed out %d!\n",
5280 skd_name(skdev), rc);
5281 /* in case of no error; we timeout with ENXIO */
5282 if (!rc)
5283 rc = -ENXIO;
5284 goto err_out_timer;
5285 }
5286
5287
5288#ifdef SKD_VMK_POLL_HANDLER
5289 if (skdev->irq_type == SKD_IRQ_MSIX) {
5290 /* MSIX completion handler is being used for coredump */
5291 vmklnx_scsi_register_poll_handler(skdev->scsi_host,
5292 skdev->msix_entries[5].vector,
5293 skd_comp_q, skdev);
5294 } else {
5295 vmklnx_scsi_register_poll_handler(skdev->scsi_host,
5296 skdev->pdev->irq, skd_isr,
5297 skdev);
5298 }
5299#endif /* SKD_VMK_POLL_HANDLER */
5300
5301 return rc;
5302
5303err_out_timer:
5304 skd_stop_device(skdev);
5305 skd_release_irq(skdev);
5306
5307err_out_iounmap:
5308 for (i = 0; i < SKD_MAX_BARS; i++)
5309 if (skdev->mem_map[i])
5310 iounmap(skdev->mem_map[i]);
5311
5312 if (skdev->pcie_error_reporting_is_enabled)
5313 pci_disable_pcie_error_reporting(pdev);
5314
5315 skd_destruct(skdev);
5316
5317err_out_regions:
5318 pci_release_regions(pdev);
5319
5320err_out:
5321 pci_disable_device(pdev);
5322 pci_set_drvdata(pdev, NULL);
5323 return rc;
5324}
5325
5326static void skd_pci_remove(struct pci_dev *pdev)
5327{
5328 int i;
5329 struct skd_device *skdev;
5330
5331 skdev = pci_get_drvdata(pdev);
5332 if (!skdev) {
5333 pr_err("%s: no device data for PCI\n", pci_name(pdev));
5334 return;
5335 }
5336 skd_stop_device(skdev);
5337 skd_release_irq(skdev);
5338
5339 for (i = 0; i < SKD_MAX_BARS; i++)
5340 if (skdev->mem_map[i])
5341 iounmap((u32 *)skdev->mem_map[i]);
5342
5343 if (skdev->pcie_error_reporting_is_enabled)
5344 pci_disable_pcie_error_reporting(pdev);
5345
5346 skd_destruct(skdev);
5347
5348 pci_release_regions(pdev);
5349 pci_disable_device(pdev);
5350 pci_set_drvdata(pdev, NULL);
5351
5352 return;
5353}
5354
5355static int skd_pci_suspend(struct pci_dev *pdev, pm_message_t state)
5356{
5357 int i;
5358 struct skd_device *skdev;
5359
5360 skdev = pci_get_drvdata(pdev);
5361 if (!skdev) {
5362 pr_err("%s: no device data for PCI\n", pci_name(pdev));
5363 return -EIO;
5364 }
5365
5366 skd_stop_device(skdev);
5367
5368 skd_release_irq(skdev);
5369
5370 for (i = 0; i < SKD_MAX_BARS; i++)
5371 if (skdev->mem_map[i])
5372 iounmap((u32 *)skdev->mem_map[i]);
5373
5374 if (skdev->pcie_error_reporting_is_enabled)
5375 pci_disable_pcie_error_reporting(pdev);
5376
5377 pci_release_regions(pdev);
5378 pci_save_state(pdev);
5379 pci_disable_device(pdev);
5380 pci_set_power_state(pdev, pci_choose_state(pdev, state));
5381 return 0;
5382}
5383
5384static int skd_pci_resume(struct pci_dev *pdev)
5385{
5386 int i;
5387 int rc = 0;
5388 struct skd_device *skdev;
5389
5390 skdev = pci_get_drvdata(pdev);
5391 if (!skdev) {
5392 pr_err("%s: no device data for PCI\n", pci_name(pdev));
5393 return -1;
5394 }
5395
5396 pci_set_power_state(pdev, PCI_D0);
5397 pci_enable_wake(pdev, PCI_D0, 0);
5398 pci_restore_state(pdev);
5399
5400 rc = pci_enable_device(pdev);
5401 if (rc)
5402 return rc;
5403 rc = pci_request_regions(pdev, DRV_NAME);
5404 if (rc)
5405 goto err_out;
5406 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
5407 if (!rc) {
5408 if (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64))) {
5409
5410 pr_err("(%s): consistent DMA mask error %d\n",
5411 pci_name(pdev), rc);
5412 }
5413 } else {
5414 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
5415 if (rc) {
5416
5417 pr_err("(%s): DMA mask error %d\n",
5418 pci_name(pdev), rc);
5419 goto err_out_regions;
5420 }
5421 }
5422
5423 pci_set_master(pdev);
5424 rc = pci_enable_pcie_error_reporting(pdev);
5425 if (rc) {
5426 pr_err("(%s): bad enable of PCIe error reporting rc=%d\n",
5427 skdev->name, rc);
5428 skdev->pcie_error_reporting_is_enabled = 0;
5429 } else
5430 skdev->pcie_error_reporting_is_enabled = 1;
5431
5432 for (i = 0; i < SKD_MAX_BARS; i++) {
5433
5434 skdev->mem_phys[i] = pci_resource_start(pdev, i);
5435 skdev->mem_size[i] = (u32)pci_resource_len(pdev, i);
5436 skdev->mem_map[i] = ioremap(skdev->mem_phys[i],
5437 skdev->mem_size[i]);
5438 if (!skdev->mem_map[i]) {
5439 pr_err("(%s): Unable to map adapter memory!\n",
5440 skd_name(skdev));
5441 rc = -ENODEV;
5442 goto err_out_iounmap;
5443 }
5444 DPRINTK(skdev, "mem_map=%p, phyd=%016llx, size=%d\n",
5445 skdev->mem_map[i],
5446 (uint64_t)skdev->mem_phys[i], skdev->mem_size[i]);
5447 }
5448 rc = skd_acquire_irq(skdev);
5449 if (rc) {
5450
5451 pr_err("(%s): interrupt resource error %d\n",
5452 pci_name(pdev), rc);
5453 goto err_out_iounmap;
5454 }
5455
5456 rc = skd_start_timer(skdev);
5457 if (rc)
5458 goto err_out_timer;
5459
5460 init_waitqueue_head(&skdev->waitq);
5461
5462 skd_start_device(skdev);
5463
5464 return rc;
5465
5466err_out_timer:
5467 skd_stop_device(skdev);
5468 skd_release_irq(skdev);
5469
5470err_out_iounmap:
5471 for (i = 0; i < SKD_MAX_BARS; i++)
5472 if (skdev->mem_map[i])
5473 iounmap(skdev->mem_map[i]);
5474
5475 if (skdev->pcie_error_reporting_is_enabled)
5476 pci_disable_pcie_error_reporting(pdev);
5477
5478err_out_regions:
5479 pci_release_regions(pdev);
5480
5481err_out:
5482 pci_disable_device(pdev);
5483 return rc;
5484}
5485
5486static void skd_pci_shutdown(struct pci_dev *pdev)
5487{
5488 struct skd_device *skdev;
5489
5490 pr_err("skd_pci_shutdown called\n");
5491
5492 skdev = pci_get_drvdata(pdev);
5493 if (!skdev) {
5494 pr_err("%s: no device data for PCI\n", pci_name(pdev));
5495 return;
5496 }
5497
5498 pr_err("%s: calling stop\n", skd_name(skdev));
5499 skd_stop_device(skdev);
5500}
5501
5502static struct pci_driver skd_driver = {
5503 .name = DRV_NAME,
5504 .id_table = skd_pci_tbl,
5505 .probe = skd_pci_probe,
5506 .remove = skd_pci_remove,
5507 .suspend = skd_pci_suspend,
5508 .resume = skd_pci_resume,
5509 .shutdown = skd_pci_shutdown,
5510};
5511
5512/*
5513 *****************************************************************************
5514 * LOGGING SUPPORT
5515 *****************************************************************************
5516 */
5517
5518static const char *skd_name(struct skd_device *skdev)
5519{
5520 memset(skdev->id_str, 0, sizeof(skdev->id_str));
5521
5522 if (skdev->inquiry_is_valid)
5523 snprintf(skdev->id_str, sizeof(skdev->id_str), "%s:%s:[%s]",
5524 skdev->name, skdev->inq_serial_num,
5525 pci_name(skdev->pdev));
5526 else
5527 snprintf(skdev->id_str, sizeof(skdev->id_str), "%s:??:[%s]",
5528 skdev->name, pci_name(skdev->pdev));
5529
5530 return skdev->id_str;
5531}
5532
5533const char *skd_drive_state_to_str(int state)
5534{
5535 switch (state) {
5536 case FIT_SR_DRIVE_OFFLINE:
5537 return "OFFLINE";
5538 case FIT_SR_DRIVE_INIT:
5539 return "INIT";
5540 case FIT_SR_DRIVE_ONLINE:
5541 return "ONLINE";
5542 case FIT_SR_DRIVE_BUSY:
5543 return "BUSY";
5544 case FIT_SR_DRIVE_FAULT:
5545 return "FAULT";
5546 case FIT_SR_DRIVE_DEGRADED:
5547 return "DEGRADED";
5548 case FIT_SR_PCIE_LINK_DOWN:
5549 return "INK_DOWN";
5550 case FIT_SR_DRIVE_SOFT_RESET:
5551 return "SOFT_RESET";
5552 case FIT_SR_DRIVE_NEED_FW_DOWNLOAD:
5553 return "NEED_FW";
5554 case FIT_SR_DRIVE_INIT_FAULT:
5555 return "INIT_FAULT";
5556 case FIT_SR_DRIVE_BUSY_SANITIZE:
5557 return "BUSY_SANITIZE";
5558 case FIT_SR_DRIVE_BUSY_ERASE:
5559 return "BUSY_ERASE";
5560 case FIT_SR_DRIVE_FW_BOOTING:
5561 return "FW_BOOTING";
5562 default:
5563 return "???";
5564 }
5565}
5566
5567const char *skd_skdev_state_to_str(enum skd_drvr_state state)
5568{
5569 switch (state) {
5570 case SKD_DRVR_STATE_LOAD:
5571 return "LOAD";
5572 case SKD_DRVR_STATE_IDLE:
5573 return "IDLE";
5574 case SKD_DRVR_STATE_BUSY:
5575 return "BUSY";
5576 case SKD_DRVR_STATE_STARTING:
5577 return "STARTING";
5578 case SKD_DRVR_STATE_ONLINE:
5579 return "ONLINE";
5580 case SKD_DRVR_STATE_PAUSING:
5581 return "PAUSING";
5582 case SKD_DRVR_STATE_PAUSED:
5583 return "PAUSED";
5584 case SKD_DRVR_STATE_DRAINING_TIMEOUT:
5585 return "DRAINING_TIMEOUT";
5586 case SKD_DRVR_STATE_RESTARTING:
5587 return "RESTARTING";
5588 case SKD_DRVR_STATE_RESUMING:
5589 return "RESUMING";
5590 case SKD_DRVR_STATE_STOPPING:
5591 return "STOPPING";
5592 case SKD_DRVR_STATE_SYNCING:
5593 return "SYNCING";
5594 case SKD_DRVR_STATE_FAULT:
5595 return "FAULT";
5596 case SKD_DRVR_STATE_DISAPPEARED:
5597 return "DISAPPEARED";
5598 case SKD_DRVR_STATE_BUSY_ERASE:
5599 return "BUSY_ERASE";
5600 case SKD_DRVR_STATE_BUSY_SANITIZE:
5601 return "BUSY_SANITIZE";
5602 case SKD_DRVR_STATE_BUSY_IMMINENT:
5603 return "BUSY_IMMINENT";
5604 case SKD_DRVR_STATE_WAIT_BOOT:
5605 return "WAIT_BOOT";
5606
5607 default:
5608 return "???";
5609 }
5610}
5611
5612const char *skd_skmsg_state_to_str(enum skd_fit_msg_state state)
5613{
5614 switch (state) {
5615 case SKD_MSG_STATE_IDLE:
5616 return "IDLE";
5617 case SKD_MSG_STATE_BUSY:
5618 return "BUSY";
5619 default:
5620 return "???";
5621 }
5622}
5623
5624const char *skd_skreq_state_to_str(enum skd_req_state state)
5625{
5626 switch (state) {
5627 case SKD_REQ_STATE_IDLE:
5628 return "IDLE";
5629 case SKD_REQ_STATE_SETUP:
5630 return "SETUP";
5631 case SKD_REQ_STATE_BUSY:
5632 return "BUSY";
5633 case SKD_REQ_STATE_COMPLETED:
5634 return "COMPLETED";
5635 case SKD_REQ_STATE_TIMEOUT:
5636 return "TIMEOUT";
5637 case SKD_REQ_STATE_ABORTED:
5638 return "ABORTED";
5639 default:
5640 return "???";
5641 }
5642}
5643
5644static void skd_log_skdev(struct skd_device *skdev, const char *event)
5645{
5646 DPRINTK(skdev, "(%s) skdev=%p event='%s'\n", skdev->name, skdev, event);
5647 DPRINTK(skdev, " drive_state=%s(%d) driver_state=%s(%d)\n",
5648 skd_drive_state_to_str(skdev->drive_state), skdev->drive_state,
5649 skd_skdev_state_to_str(skdev->state), skdev->state);
5650 DPRINTK(skdev, " busy=%d limit=%d dev=%d lowat=%d\n",
5651 skdev->in_flight, skdev->cur_max_queue_depth,
5652 skdev->dev_max_queue_depth, skdev->queue_low_water_mark);
5653 DPRINTK(skdev, " timestamp=0x%x cycle=%d cycle_ix=%d\n",
5654 skdev->timeout_stamp, skdev->skcomp_cycle, skdev->skcomp_ix);
5655}
5656
5657static void skd_log_skmsg(struct skd_device *skdev,
5658 struct skd_fitmsg_context *skmsg, const char *event)
5659{
5660 DPRINTK(skdev, "(%s) skmsg=%p event='%s'\n", skdev->name, skmsg, event);
5661 DPRINTK(skdev, " state=%s(%d) id=0x%04x length=%d\n",
5662 skd_skmsg_state_to_str(skmsg->state), skmsg->state,
5663 skmsg->id, skmsg->length);
5664}
5665
5666static void skd_log_skreq(struct skd_device *skdev,
5667 struct skd_request_context *skreq, const char *event)
5668{
5669 DPRINTK(skdev, "(%s) skreq=%p event='%s'\n", skdev->name, skreq, event);
5670 DPRINTK(skdev, " state=%s(%d) id=0x%04x fitmsg=0x%04x\n",
5671 skd_skreq_state_to_str(skreq->state), skreq->state,
5672 skreq->id, skreq->fitmsg_id);
5673 DPRINTK(skdev, " timo=0x%x sg_dir=%d n_sg=%d\n",
5674 skreq->timeout_stamp, skreq->sg_data_dir, skreq->n_sg);
5675
5676 if (!skd_bio) {
5677 if (skreq->req != NULL) {
5678 struct request *req = skreq->req;
5679 u32 lba = (u32)blk_rq_pos(req);
5680 u32 count = blk_rq_sectors(req);
5681
5682 DPRINTK(skdev,
5683 " req=%p lba=%u(0x%x) count=%u(0x%x) dir=%d\n",
5684 req, lba, lba, count, count,
5685 (int)rq_data_dir(req));
5686 } else
5687 DPRINTK(skdev, " req=NULL\n");
5688 } else {
5689 if (skreq->bio != NULL) {
5690 struct bio *bio = skreq->bio;
5691 u32 lba = (u32)bio->bi_sector;
5692 u32 count = bio_sectors(bio);
5693
5694 DPRINTK(skdev,
5695 " bio=%p lba=%u(0x%x) count=%u(0x%x) dir=%d\n",
5696 bio, lba, lba, count, count,
5697 (int)bio_data_dir(bio));
5698 } else
5699 DPRINTK(skdev, " req=NULL\n");
5700 }
5701}
5702
5703/*
5704 *****************************************************************************
5705 * MODULE GLUE
5706 *****************************************************************************
5707 */
5708
5709static int __init skd_init(void)
5710{
5711 int rc = 0;
5712
5713 pr_info(PFX " v%s-b%s loaded\n", DRV_VERSION, DRV_BUILD_ID);
5714
5715 switch (skd_isr_type) {
5716 case SKD_IRQ_LEGACY:
5717 case SKD_IRQ_MSI:
5718 case SKD_IRQ_MSIX:
5719 break;
5720 default:
5721 pr_info("skd_isr_type %d invalid, re-set to %d\n",
5722 skd_isr_type, SKD_IRQ_DEFAULT);
5723 skd_isr_type = SKD_IRQ_DEFAULT;
5724 }
5725
5726 skd_flush_slab = kmem_cache_create(SKD_FLUSH_JOB,
5727 sizeof(struct skd_flush_cmd),
5728 0, 0, NULL);
5729
5730 if (!skd_flush_slab) {
5731 pr_err("failed to allocated flush slab.\n");
5732 return -ENOMEM;
5733 }
5734
5735 if (skd_max_queue_depth < 1
5736 || skd_max_queue_depth > SKD_MAX_QUEUE_DEPTH) {
5737 pr_info(
5738 "skd_max_queue_depth %d invalid, re-set to %d\n",
5739 skd_max_queue_depth, SKD_MAX_QUEUE_DEPTH_DEFAULT);
5740 skd_max_queue_depth = SKD_MAX_QUEUE_DEPTH_DEFAULT;
5741 }
5742
5743 if (skd_max_req_per_msg < 1 || skd_max_req_per_msg > 14) {
5744 pr_info(
5745 "skd_max_req_per_msg %d invalid, re-set to %d\n",
5746 skd_max_req_per_msg, SKD_MAX_REQ_PER_MSG_DEFAULT);
5747 skd_max_req_per_msg = SKD_MAX_REQ_PER_MSG_DEFAULT;
5748 }
5749
5750 if (skd_sgs_per_request < 1 || skd_sgs_per_request > 4096) {
5751 pr_info(
5752 "skd_sg_per_request %d invalid, re-set to %d\n",
5753 skd_sgs_per_request, SKD_N_SG_PER_REQ_DEFAULT);
5754 skd_sgs_per_request = SKD_N_SG_PER_REQ_DEFAULT;
5755 }
5756
5757 if (skd_dbg_level < 0 || skd_dbg_level > 2) {
5758 pr_info("skd_dbg_level %d invalid, re-set to %d\n",
5759 skd_dbg_level, 0);
5760 skd_dbg_level = 0;
5761 }
5762
5763 if (skd_isr_comp_limit < 0) {
5764 pr_info("skd_isr_comp_limit %d invalid, set to %d\n",
5765 skd_isr_comp_limit, 0);
5766 skd_isr_comp_limit = 0;
5767 }
5768
5769 if (skd_max_pass_thru < 1 || skd_max_pass_thru > 50) {
5770 pr_info("skd_max_pass_thru %d invalid, re-set to %d\n",
5771 skd_max_pass_thru, SKD_N_SPECIAL_CONTEXT);
5772 skd_max_pass_thru = SKD_N_SPECIAL_CONTEXT;
5773 }
5774
5775 /* Obtain major device number. */
5776 rc = register_blkdev(0, DRV_NAME);
5777 if (rc < 0)
5778 return rc;
5779
5780 skd_major = rc;
5781
5782 return pci_register_driver(&skd_driver);
5783
5784}
5785
5786static void __exit skd_exit(void)
5787{
5788 pr_info(PFX " v%s-b%s unloading\n", DRV_VERSION, DRV_BUILD_ID);
5789
5790 unregister_blkdev(skd_major, DRV_NAME);
5791 pci_unregister_driver(&skd_driver);
5792
5793 kmem_cache_destroy(skd_flush_slab);
5794}
5795
5796static int
5797skd_flush_cmd_enqueue(struct skd_device *skdev, void *cmd)
5798{
5799 struct skd_flush_cmd *item;
5800
5801 item = kmem_cache_zalloc(skd_flush_slab, GFP_ATOMIC);
5802 if (!item) {
5803 pr_err("skd_flush_cmd_enqueue: Failed to allocated item.\n");
5804 return -ENOMEM;
5805 }
5806
5807 item->cmd = cmd;
5808 list_add_tail(&item->flist, &skdev->flush_list);
5809 return 0;
5810}
5811
5812static void *
5813skd_flush_cmd_dequeue(struct skd_device *skdev)
5814{
5815 void *cmd;
5816 struct skd_flush_cmd *item;
5817
5818 item = list_entry(skdev->flush_list.next, struct skd_flush_cmd, flist);
5819 list_del_init(&item->flist);
5820 cmd = item->cmd;
5821 kmem_cache_free(skd_flush_slab, item);
5822 return cmd;
5823}
5824
5825module_init(skd_init);
5826module_exit(skd_exit);
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