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