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loop: fix crash when using unassigned loop device
[mirror_ubuntu-zesty-kernel.git] / drivers / block / rsxx / core.c
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8722ff8c 1/*
2* Filename: core.c
3*
4*
5* Authors: Joshua Morris <josh.h.morris@us.ibm.com>
6* Philip Kelleher <pjk1939@linux.vnet.ibm.com>
7*
8* (C) Copyright 2013 IBM Corporation
9*
10* This program is free software; you can redistribute it and/or
11* modify it under the terms of the GNU General Public License as
12* published by the Free Software Foundation; either version 2 of the
13* License, or (at your option) any later version.
14*
15* This program is distributed in the hope that it will be useful, but
16* WITHOUT ANY WARRANTY; without even the implied warranty of
17* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18* General Public License for more details.
19*
20* You should have received a copy of the GNU General Public License
21* along with this program; if not, write to the Free Software Foundation,
22* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23*/
24
25#include <linux/kernel.h>
26#include <linux/init.h>
27#include <linux/interrupt.h>
28#include <linux/module.h>
29#include <linux/pci.h>
30#include <linux/reboot.h>
31#include <linux/slab.h>
32#include <linux/bitops.h>
c95246c3 33#include <linux/delay.h>
36f988e9
PK		 34#include <linux/debugfs.h>
35#include <linux/seq_file.h>
8722ff8c 36
37#include <linux/genhd.h>
38#include <linux/idr.h>
39
40#include "rsxx_priv.h"
41#include "rsxx_cfg.h"
42
43#define NO_LEGACY 0
fb065cd9 44#define SYNC_START_TIMEOUT (10 * 60) /* 10 minutes */
8722ff8c 45
f730e3dc 46MODULE_DESCRIPTION("IBM Flash Adapter 900GB Full Height Device Driver");
9bb3c446 47MODULE_AUTHOR("Joshua Morris/Philip Kelleher, IBM");
8722ff8c 48MODULE_LICENSE("GPL");
49MODULE_VERSION(DRIVER_VERSION);
50
51static unsigned int force_legacy = NO_LEGACY;
52module_param(force_legacy, uint, 0444);
53MODULE_PARM_DESC(force_legacy, "Force the use of legacy type PCI interrupts");
54
fb065cd9
PK		 55static unsigned int sync_start = 1;
56module_param(sync_start, uint, 0444);
57MODULE_PARM_DESC(sync_start, "On by Default: Driver load will not complete "
58 "until the card startup has completed.");
59
8722ff8c 60static DEFINE_IDA(rsxx_disk_ida);
61static DEFINE_SPINLOCK(rsxx_ida_lock);
62
36f988e9
PK		 63/* --------------------Debugfs Setup ------------------- */
64
65struct rsxx_cram {
66 u32 f_pos;
67 u32 offset;
68 void *i_private;
69};
70
71static int rsxx_attr_pci_regs_show(struct seq_file *m, void *p)
72{
73 struct rsxx_cardinfo *card = m->private;
74
75 seq_printf(m, "HWID 0x%08x\n",
76 ioread32(card->regmap + HWID));
77 seq_printf(m, "SCRATCH 0x%08x\n",
78 ioread32(card->regmap + SCRATCH));
79 seq_printf(m, "IER 0x%08x\n",
80 ioread32(card->regmap + IER));
81 seq_printf(m, "IPR 0x%08x\n",
82 ioread32(card->regmap + IPR));
83 seq_printf(m, "CREG_CMD 0x%08x\n",
84 ioread32(card->regmap + CREG_CMD));
85 seq_printf(m, "CREG_ADD 0x%08x\n",
86 ioread32(card->regmap + CREG_ADD));
87 seq_printf(m, "CREG_CNT 0x%08x\n",
88 ioread32(card->regmap + CREG_CNT));
89 seq_printf(m, "CREG_STAT 0x%08x\n",
90 ioread32(card->regmap + CREG_STAT));
91 seq_printf(m, "CREG_DATA0 0x%08x\n",
92 ioread32(card->regmap + CREG_DATA0));
93 seq_printf(m, "CREG_DATA1 0x%08x\n",
94 ioread32(card->regmap + CREG_DATA1));
95 seq_printf(m, "CREG_DATA2 0x%08x\n",
96 ioread32(card->regmap + CREG_DATA2));
97 seq_printf(m, "CREG_DATA3 0x%08x\n",
98 ioread32(card->regmap + CREG_DATA3));
99 seq_printf(m, "CREG_DATA4 0x%08x\n",
100 ioread32(card->regmap + CREG_DATA4));
101 seq_printf(m, "CREG_DATA5 0x%08x\n",
102 ioread32(card->regmap + CREG_DATA5));
103 seq_printf(m, "CREG_DATA6 0x%08x\n",
104 ioread32(card->regmap + CREG_DATA6));
105 seq_printf(m, "CREG_DATA7 0x%08x\n",
106 ioread32(card->regmap + CREG_DATA7));
107 seq_printf(m, "INTR_COAL 0x%08x\n",
108 ioread32(card->regmap + INTR_COAL));
109 seq_printf(m, "HW_ERROR 0x%08x\n",
110 ioread32(card->regmap + HW_ERROR));
111 seq_printf(m, "DEBUG0 0x%08x\n",
112 ioread32(card->regmap + PCI_DEBUG0));
113 seq_printf(m, "DEBUG1 0x%08x\n",
114 ioread32(card->regmap + PCI_DEBUG1));
115 seq_printf(m, "DEBUG2 0x%08x\n",
116 ioread32(card->regmap + PCI_DEBUG2));
117 seq_printf(m, "DEBUG3 0x%08x\n",
118 ioread32(card->regmap + PCI_DEBUG3));
119 seq_printf(m, "DEBUG4 0x%08x\n",
120 ioread32(card->regmap + PCI_DEBUG4));
121 seq_printf(m, "DEBUG5 0x%08x\n",
122 ioread32(card->regmap + PCI_DEBUG5));
123 seq_printf(m, "DEBUG6 0x%08x\n",
124 ioread32(card->regmap + PCI_DEBUG6));
125 seq_printf(m, "DEBUG7 0x%08x\n",
126 ioread32(card->regmap + PCI_DEBUG7));
127 seq_printf(m, "RECONFIG 0x%08x\n",
128 ioread32(card->regmap + PCI_RECONFIG));
129
130 return 0;
131}
132
133static int rsxx_attr_stats_show(struct seq_file *m, void *p)
134{
135 struct rsxx_cardinfo *card = m->private;
136 int i;
137
138 for (i = 0; i < card->n_targets; i++) {
139 seq_printf(m, "Ctrl %d CRC Errors = %d\n",
140 i, card->ctrl[i].stats.crc_errors);
141 seq_printf(m, "Ctrl %d Hard Errors = %d\n",
142 i, card->ctrl[i].stats.hard_errors);
143 seq_printf(m, "Ctrl %d Soft Errors = %d\n",
144 i, card->ctrl[i].stats.soft_errors);
145 seq_printf(m, "Ctrl %d Writes Issued = %d\n",
146 i, card->ctrl[i].stats.writes_issued);
147 seq_printf(m, "Ctrl %d Writes Failed = %d\n",
148 i, card->ctrl[i].stats.writes_failed);
149 seq_printf(m, "Ctrl %d Reads Issued = %d\n",
150 i, card->ctrl[i].stats.reads_issued);
151 seq_printf(m, "Ctrl %d Reads Failed = %d\n",
152 i, card->ctrl[i].stats.reads_failed);
153 seq_printf(m, "Ctrl %d Reads Retried = %d\n",
154 i, card->ctrl[i].stats.reads_retried);
155 seq_printf(m, "Ctrl %d Discards Issued = %d\n",
156 i, card->ctrl[i].stats.discards_issued);
157 seq_printf(m, "Ctrl %d Discards Failed = %d\n",
158 i, card->ctrl[i].stats.discards_failed);
159 seq_printf(m, "Ctrl %d DMA SW Errors = %d\n",
160 i, card->ctrl[i].stats.dma_sw_err);
161 seq_printf(m, "Ctrl %d DMA HW Faults = %d\n",
162 i, card->ctrl[i].stats.dma_hw_fault);
163 seq_printf(m, "Ctrl %d DMAs Cancelled = %d\n",
164 i, card->ctrl[i].stats.dma_cancelled);
165 seq_printf(m, "Ctrl %d SW Queue Depth = %d\n",
166 i, card->ctrl[i].stats.sw_q_depth);
167 seq_printf(m, "Ctrl %d HW Queue Depth = %d\n",
168 i, atomic_read(&card->ctrl[i].stats.hw_q_depth));
169 }
170
171 return 0;
172}
173
174static int rsxx_attr_stats_open(struct inode *inode, struct file *file)
175{
176 return single_open(file, rsxx_attr_stats_show, inode->i_private);
177}
178
179static int rsxx_attr_pci_regs_open(struct inode *inode, struct file *file)
180{
181 return single_open(file, rsxx_attr_pci_regs_show, inode->i_private);
182}
183
184static ssize_t rsxx_cram_read(struct file *fp, char __user *ubuf,
185 size_t cnt, loff_t *ppos)
186{
187 struct rsxx_cram *info = fp->private_data;
188 struct rsxx_cardinfo *card = info->i_private;
189 char *buf;
190 int st;
191
192 buf = kzalloc(sizeof(*buf) * cnt, GFP_KERNEL);
193 if (!buf)
194 return -ENOMEM;
195
196 info->f_pos = (u32)*ppos + info->offset;
197
198 st = rsxx_creg_read(card, CREG_ADD_CRAM + info->f_pos, cnt, buf, 1);
199 if (st)
200 return st;
201
202 st = copy_to_user(ubuf, buf, cnt);
203 if (st)
204 return st;
205
206 info->offset += cnt;
207
208 kfree(buf);
209
210 return cnt;
211}
212
213static ssize_t rsxx_cram_write(struct file *fp, const char __user *ubuf,
214 size_t cnt, loff_t *ppos)
215{
216 struct rsxx_cram *info = fp->private_data;
217 struct rsxx_cardinfo *card = info->i_private;
218 char *buf;
219 int st;
220
221 buf = kzalloc(sizeof(*buf) * cnt, GFP_KERNEL);
222 if (!buf)
223 return -ENOMEM;
224
225 st = copy_from_user(buf, ubuf, cnt);
226 if (st)
227 return st;
228
229 info->f_pos = (u32)*ppos + info->offset;
230
231 st = rsxx_creg_write(card, CREG_ADD_CRAM + info->f_pos, cnt, buf, 1);
232 if (st)
233 return st;
234
235 info->offset += cnt;
236
237 kfree(buf);
238
239 return cnt;
240}
241
242static int rsxx_cram_open(struct inode *inode, struct file *file)
243{
244 struct rsxx_cram *info = kzalloc(sizeof(*info), GFP_KERNEL);
245 if (!info)
246 return -ENOMEM;
247
248 info->i_private = inode->i_private;
249 info->f_pos = file->f_pos;
250 file->private_data = info;
251
252 return 0;
253}
254
255static int rsxx_cram_release(struct inode *inode, struct file *file)
256{
257 struct rsxx_cram *info = file->private_data;
258
259 if (!info)
260 return 0;
261
262 kfree(info);
263 file->private_data = NULL;
264
265 return 0;
266}
267
268static const struct file_operations debugfs_cram_fops = {
269 .owner = THIS_MODULE,
270 .open = rsxx_cram_open,
271 .read = rsxx_cram_read,
272 .write = rsxx_cram_write,
273 .release = rsxx_cram_release,
274};
275
276static const struct file_operations debugfs_stats_fops = {
277 .owner = THIS_MODULE,
278 .open = rsxx_attr_stats_open,
279 .read = seq_read,
280 .llseek = seq_lseek,
281 .release = single_release,
282};
283
284static const struct file_operations debugfs_pci_regs_fops = {
285 .owner = THIS_MODULE,
286 .open = rsxx_attr_pci_regs_open,
287 .read = seq_read,
288 .llseek = seq_lseek,
289 .release = single_release,
290};
291
292static void rsxx_debugfs_dev_new(struct rsxx_cardinfo *card)
293{
294 struct dentry *debugfs_stats;
295 struct dentry *debugfs_pci_regs;
296 struct dentry *debugfs_cram;
297
298 card->debugfs_dir = debugfs_create_dir(card->gendisk->disk_name, NULL);
299 if (IS_ERR_OR_NULL(card->debugfs_dir))
300 goto failed_debugfs_dir;
301
302 debugfs_stats = debugfs_create_file("stats", S_IRUGO,
303 card->debugfs_dir, card,
304 &debugfs_stats_fops);
305 if (IS_ERR_OR_NULL(debugfs_stats))
306 goto failed_debugfs_stats;
307
308 debugfs_pci_regs = debugfs_create_file("pci_regs", S_IRUGO,
309 card->debugfs_dir, card,
310 &debugfs_pci_regs_fops);
311 if (IS_ERR_OR_NULL(debugfs_pci_regs))
312 goto failed_debugfs_pci_regs;
313
314 debugfs_cram = debugfs_create_file("cram", S_IRUGO | S_IWUSR,
315 card->debugfs_dir, card,
316 &debugfs_cram_fops);
317 if (IS_ERR_OR_NULL(debugfs_cram))
318 goto failed_debugfs_cram;
319
320 return;
321failed_debugfs_cram:
322 debugfs_remove(debugfs_pci_regs);
323failed_debugfs_pci_regs:
324 debugfs_remove(debugfs_stats);
325failed_debugfs_stats:
326 debugfs_remove(card->debugfs_dir);
327failed_debugfs_dir:
328 card->debugfs_dir = NULL;
329}
330
8722ff8c 331/*----------------- Interrupt Control & Handling -------------------*/
c95246c3
PK		 332
333static void rsxx_mask_interrupts(struct rsxx_cardinfo *card)
334{
335 card->isr_mask = 0;
336 card->ier_mask = 0;
337}
338
8722ff8c 339static void __enable_intr(unsigned int *mask, unsigned int intr)
340{
341 *mask |= intr;
342}
343
344static void __disable_intr(unsigned int *mask, unsigned int intr)
345{
346 *mask &= ~intr;
347}
348
349/*
350 * NOTE: Disabling the IER will disable the hardware interrupt.
351 * Disabling the ISR will disable the software handling of the ISR bit.
352 *
353 * Enable/Disable interrupt functions assume the card->irq_lock
354 * is held by the caller.
355 */
356void rsxx_enable_ier(struct rsxx_cardinfo *card, unsigned int intr)
357{
c95246c3
PK		 358 if (unlikely(card->halt) ||
359 unlikely(card->eeh_state))
8722ff8c 360 return;
361
362 __enable_intr(&card->ier_mask, intr);
363 iowrite32(card->ier_mask, card->regmap + IER);
364}
365
366void rsxx_disable_ier(struct rsxx_cardinfo *card, unsigned int intr)
367{
c95246c3
PK		 368 if (unlikely(card->eeh_state))
369 return;
370
8722ff8c 371 __disable_intr(&card->ier_mask, intr);
372 iowrite32(card->ier_mask, card->regmap + IER);
373}
374
375void rsxx_enable_ier_and_isr(struct rsxx_cardinfo *card,
376 unsigned int intr)
377{
c95246c3
PK		 378 if (unlikely(card->halt) ||
379 unlikely(card->eeh_state))
8722ff8c 380 return;
381
382 __enable_intr(&card->isr_mask, intr);
383 __enable_intr(&card->ier_mask, intr);
384 iowrite32(card->ier_mask, card->regmap + IER);
385}
386void rsxx_disable_ier_and_isr(struct rsxx_cardinfo *card,
387 unsigned int intr)
388{
c95246c3
PK		 389 if (unlikely(card->eeh_state))
390 return;
391
8722ff8c 392 __disable_intr(&card->isr_mask, intr);
393 __disable_intr(&card->ier_mask, intr);
394 iowrite32(card->ier_mask, card->regmap + IER);
395}
396
c206c709 397static irqreturn_t rsxx_isr(int irq, void *pdata)
8722ff8c 398{
c206c709 399 struct rsxx_cardinfo *card = pdata;
8722ff8c 400 unsigned int isr;
401 int handled = 0;
402 int reread_isr;
403 int i;
404
405 spin_lock(&card->irq_lock);
406
407 do {
408 reread_isr = 0;
409
c95246c3
PK		 410 if (unlikely(card->eeh_state))
411 break;
412
8722ff8c 413 isr = ioread32(card->regmap + ISR);
414 if (isr == 0xffffffff) {
415 /*
416 * A few systems seem to have an intermittent issue
417 * where PCI reads return all Fs, but retrying the read
418 * a little later will return as expected.
419 */
420 dev_info(CARD_TO_DEV(card),
421 "ISR = 0xFFFFFFFF, retrying later\n");
422 break;
423 }
424
425 isr &= card->isr_mask;
426 if (!isr)
427 break;
428
429 for (i = 0; i < card->n_targets; i++) {
430 if (isr & CR_INTR_DMA(i)) {
431 if (card->ier_mask & CR_INTR_DMA(i)) {
432 rsxx_disable_ier(card, CR_INTR_DMA(i));
433 reread_isr = 1;
434 }
435 queue_work(card->ctrl[i].done_wq,
436 &card->ctrl[i].dma_done_work);
437 handled++;
438 }
439 }
440
441 if (isr & CR_INTR_CREG) {
a3299ab1
PK		 442 queue_work(card->creg_ctrl.creg_wq,
443 &card->creg_ctrl.done_work);
8722ff8c 444 handled++;
445 }
446
447 if (isr & CR_INTR_EVENT) {
a3299ab1 448 queue_work(card->event_wq, &card->event_work);
8722ff8c 449 rsxx_disable_ier_and_isr(card, CR_INTR_EVENT);
450 handled++;
451 }
452 } while (reread_isr);
453
454 spin_unlock(&card->irq_lock);
455
456 return handled ? IRQ_HANDLED : IRQ_NONE;
457}
458
459/*----------------- Card Event Handler -------------------*/
f3791203 460static const char * const rsxx_card_state_to_str(unsigned int state)
c206c709 461{
f3791203 462 static const char * const state_strings[] = {
c206c709
PK		 463 "Unknown", "Shutdown", "Starting", "Formatting",
464 "Uninitialized", "Good", "Shutting Down",
465 "Fault", "Read Only Fault", "dStroying"
466 };
467
468 return state_strings[ffs(state)];
469}
470
8722ff8c 471static void card_state_change(struct rsxx_cardinfo *card,
472 unsigned int new_state)
473{
474 int st;
475
476 dev_info(CARD_TO_DEV(card),
477 "card state change detected.(%s -> %s)\n",
478 rsxx_card_state_to_str(card->state),
479 rsxx_card_state_to_str(new_state));
480
481 card->state = new_state;
482
483 /* Don't attach DMA interfaces if the card has an invalid config */
484 if (!card->config_valid)
485 return;
486
487 switch (new_state) {
488 case CARD_STATE_RD_ONLY_FAULT:
489 dev_crit(CARD_TO_DEV(card),
490 "Hardware has entered read-only mode!\n");
491 /*
492 * Fall through so the DMA devices can be attached and
493 * the user can attempt to pull off their data.
494 */
495 case CARD_STATE_GOOD:
496 st = rsxx_get_card_size8(card, &card->size8);
497 if (st)
498 dev_err(CARD_TO_DEV(card),
499 "Failed attaching DMA devices\n");
500
501 if (card->config_valid)
502 set_capacity(card->gendisk, card->size8 >> 9);
503 break;
504
505 case CARD_STATE_FAULT:
506 dev_crit(CARD_TO_DEV(card),
507 "Hardware Fault reported!\n");
508 /* Fall through. */
509
510 /* Everything else, detach DMA interface if it's attached. */
511 case CARD_STATE_SHUTDOWN:
512 case CARD_STATE_STARTING:
513 case CARD_STATE_FORMATTING:
514 case CARD_STATE_UNINITIALIZED:
515 case CARD_STATE_SHUTTING_DOWN:
516 /*
517 * dStroy is a term coined by marketing to represent the low level
518 * secure erase.
519 */
520 case CARD_STATE_DSTROYING:
521 set_capacity(card->gendisk, 0);
522 break;
523 }
524}
525
526static void card_event_handler(struct work_struct *work)
527{
528 struct rsxx_cardinfo *card;
529 unsigned int state;
530 unsigned long flags;
531 int st;
532
533 card = container_of(work, struct rsxx_cardinfo, event_work);
534
535 if (unlikely(card->halt))
536 return;
537
538 /*
539 * Enable the interrupt now to avoid any weird race conditions where a
540 * state change might occur while rsxx_get_card_state() is
541 * processing a returned creg cmd.
542 */
543 spin_lock_irqsave(&card->irq_lock, flags);
544 rsxx_enable_ier_and_isr(card, CR_INTR_EVENT);
545 spin_unlock_irqrestore(&card->irq_lock, flags);
546
547 st = rsxx_get_card_state(card, &state);
548 if (st) {
549 dev_info(CARD_TO_DEV(card),
550 "Failed reading state after event.\n");
551 return;
552 }
553
554 if (card->state != state)
555 card_state_change(card, state);
556
557 if (card->creg_ctrl.creg_stats.stat & CREG_STAT_LOG_PENDING)
558 rsxx_read_hw_log(card);
559}
560
8722ff8c 561/*----------------- Card Operations -------------------*/
562static int card_shutdown(struct rsxx_cardinfo *card)
563{
564 unsigned int state;
565 signed long start;
566 const int timeout = msecs_to_jiffies(120000);
567 int st;
568
569 /* We can't issue a shutdown if the card is in a transition state */
570 start = jiffies;
571 do {
572 st = rsxx_get_card_state(card, &state);
573 if (st)
574 return st;
575 } while (state == CARD_STATE_STARTING &&
576 (jiffies - start < timeout));
577
578 if (state == CARD_STATE_STARTING)
579 return -ETIMEDOUT;
580
581 /* Only issue a shutdown if we need to */
582 if ((state != CARD_STATE_SHUTTING_DOWN) &&
583 (state != CARD_STATE_SHUTDOWN)) {
584 st = rsxx_issue_card_cmd(card, CARD_CMD_SHUTDOWN);
585 if (st)
586 return st;
587 }
588
589 start = jiffies;
590 do {
591 st = rsxx_get_card_state(card, &state);
592 if (st)
593 return st;
594 } while (state != CARD_STATE_SHUTDOWN &&
595 (jiffies - start < timeout));
596
597 if (state != CARD_STATE_SHUTDOWN)
598 return -ETIMEDOUT;
599
600 return 0;
601}
602
4dcaf472 603static int rsxx_eeh_frozen(struct pci_dev *dev)
c95246c3
PK		 604{
605 struct rsxx_cardinfo *card = pci_get_drvdata(dev);
606 int i;
4dcaf472 607 int st;
c95246c3 608
f730e3dc 609 dev_warn(&dev->dev, "IBM Flash Adapter PCI: preparing for slot reset.\n");
c95246c3
PK		 610
611 card->eeh_state = 1;
612 rsxx_mask_interrupts(card);
613
614 /*
615 * We need to guarantee that the write for eeh_state and masking
616 * interrupts does not become reordered. This will prevent a possible
617 * race condition with the EEH code.
618 */
619 wmb();
620
621 pci_disable_device(dev);
622
4dcaf472
PK		 623 st = rsxx_eeh_save_issued_dmas(card);
624 if (st)
625 return st;
c95246c3
PK		 626
627 rsxx_eeh_save_issued_creg(card);
628
629 for (i = 0; i < card->n_targets; i++) {
630 if (card->ctrl[i].status.buf)
631 pci_free_consistent(card->dev, STATUS_BUFFER_SIZE8,
632 card->ctrl[i].status.buf,
633 card->ctrl[i].status.dma_addr);
634 if (card->ctrl[i].cmd.buf)
635 pci_free_consistent(card->dev, COMMAND_BUFFER_SIZE8,
636 card->ctrl[i].cmd.buf,
637 card->ctrl[i].cmd.dma_addr);
638 }
4dcaf472
PK		 639
640 return 0;
c95246c3
PK		 641}
642
643static void rsxx_eeh_failure(struct pci_dev *dev)
644{
645 struct rsxx_cardinfo *card = pci_get_drvdata(dev);
646 int i;
0ab4743e 647 int cnt = 0;
c95246c3 648
f730e3dc 649 dev_err(&dev->dev, "IBM Flash Adapter PCI: disabling failed card.\n");
c95246c3
PK		 650
651 card->eeh_state = 1;
0ab4743e 652 card->halt = 1;
c95246c3 653
0ab4743e
PK		 654 for (i = 0; i < card->n_targets; i++) {
655 spin_lock_bh(&card->ctrl[i].queue_lock);
656 cnt = rsxx_cleanup_dma_queue(&card->ctrl[i],
657 &card->ctrl[i].queue);
658 spin_unlock_bh(&card->ctrl[i].queue_lock);
659
660 cnt += rsxx_dma_cancel(&card->ctrl[i]);
c95246c3 661
0ab4743e
PK		 662 if (cnt)
663 dev_info(CARD_TO_DEV(card),
664 "Freed %d queued DMAs on channel %d\n",
665 cnt, card->ctrl[i].id);
666 }
c95246c3
PK		 667}
668
669static int rsxx_eeh_fifo_flush_poll(struct rsxx_cardinfo *card)
670{
671 unsigned int status;
672 int iter = 0;
673
674 /* We need to wait for the hardware to reset */
675 while (iter++ < 10) {
676 status = ioread32(card->regmap + PCI_RECONFIG);
677
678 if (status & RSXX_FLUSH_BUSY) {
679 ssleep(1);
680 continue;
681 }
682
683 if (status & RSXX_FLUSH_TIMEOUT)
684 dev_warn(CARD_TO_DEV(card), "HW: flash controller timeout\n");
685 return 0;
686 }
687
688 /* Hardware failed resetting itself. */
689 return -1;
690}
691
692static pci_ers_result_t rsxx_error_detected(struct pci_dev *dev,
693 enum pci_channel_state error)
694{
4dcaf472
PK		 695 int st;
696
c95246c3
PK		 697 if (dev->revision < RSXX_EEH_SUPPORT)
698 return PCI_ERS_RESULT_NONE;
699
700 if (error == pci_channel_io_perm_failure) {
701 rsxx_eeh_failure(dev);
702 return PCI_ERS_RESULT_DISCONNECT;
703 }
704
4dcaf472
PK		 705 st = rsxx_eeh_frozen(dev);
706 if (st) {
707 dev_err(&dev->dev, "Slot reset setup failed\n");
708 rsxx_eeh_failure(dev);
709 return PCI_ERS_RESULT_DISCONNECT;
710 }
711
c95246c3
PK		 712 return PCI_ERS_RESULT_NEED_RESET;
713}
714
715static pci_ers_result_t rsxx_slot_reset(struct pci_dev *dev)
716{
717 struct rsxx_cardinfo *card = pci_get_drvdata(dev);
718 unsigned long flags;
719 int i;
720 int st;
721
722 dev_warn(&dev->dev,
f730e3dc 723 "IBM Flash Adapter PCI: recovering from slot reset.\n");
c95246c3
PK		 724
725 st = pci_enable_device(dev);
726 if (st)
727 goto failed_hw_setup;
728
729 pci_set_master(dev);
730
731 st = rsxx_eeh_fifo_flush_poll(card);
732 if (st)
733 goto failed_hw_setup;
734
735 rsxx_dma_queue_reset(card);
736
737 for (i = 0; i < card->n_targets; i++) {
738 st = rsxx_hw_buffers_init(dev, &card->ctrl[i]);
739 if (st)
740 goto failed_hw_buffers_init;
741 }
742
743 if (card->config_valid)
744 rsxx_dma_configure(card);
745
746 /* Clears the ISR register from spurious interrupts */
747 st = ioread32(card->regmap + ISR);
748
749 card->eeh_state = 0;
750
751 st = rsxx_eeh_remap_dmas(card);
752 if (st)
753 goto failed_remap_dmas;
754
755 spin_lock_irqsave(&card->irq_lock, flags);
756 if (card->n_targets & RSXX_MAX_TARGETS)
757 rsxx_enable_ier_and_isr(card, CR_INTR_ALL_G);
758 else
759 rsxx_enable_ier_and_isr(card, CR_INTR_ALL_C);
760 spin_unlock_irqrestore(&card->irq_lock, flags);
761
762 rsxx_kick_creg_queue(card);
763
764 for (i = 0; i < card->n_targets; i++) {
765 spin_lock(&card->ctrl[i].queue_lock);
766 if (list_empty(&card->ctrl[i].queue)) {
767 spin_unlock(&card->ctrl[i].queue_lock);
768 continue;
769 }
770 spin_unlock(&card->ctrl[i].queue_lock);
771
772 queue_work(card->ctrl[i].issue_wq,
773 &card->ctrl[i].issue_dma_work);
774 }
775
f730e3dc 776 dev_info(&dev->dev, "IBM Flash Adapter PCI: recovery complete.\n");
c95246c3
PK		 777
778 return PCI_ERS_RESULT_RECOVERED;
779
780failed_hw_buffers_init:
781failed_remap_dmas:
782 for (i = 0; i < card->n_targets; i++) {
783 if (card->ctrl[i].status.buf)
784 pci_free_consistent(card->dev,
785 STATUS_BUFFER_SIZE8,
786 card->ctrl[i].status.buf,
787 card->ctrl[i].status.dma_addr);
788 if (card->ctrl[i].cmd.buf)
789 pci_free_consistent(card->dev,
790 COMMAND_BUFFER_SIZE8,
791 card->ctrl[i].cmd.buf,
792 card->ctrl[i].cmd.dma_addr);
793 }
794failed_hw_setup:
795 rsxx_eeh_failure(dev);
796 return PCI_ERS_RESULT_DISCONNECT;
797
798}
799
8722ff8c 800/*----------------- Driver Initialization & Setup -------------------*/
801/* Returns: 0 if the driver is compatible with the device
802 -1 if the driver is NOT compatible with the device */
803static int rsxx_compatibility_check(struct rsxx_cardinfo *card)
804{
805 unsigned char pci_rev;
806
807 pci_read_config_byte(card->dev, PCI_REVISION_ID, &pci_rev);
808
809 if (pci_rev > RS70_PCI_REV_SUPPORTED)
810 return -1;
811 return 0;
812}
813
82bed4d5 814static int rsxx_pci_probe(struct pci_dev *dev,
8722ff8c 815 const struct pci_device_id *id)
816{
817 struct rsxx_cardinfo *card;
8722ff8c 818 int st;
fb065cd9 819 unsigned int sync_timeout;
8722ff8c 820
821 dev_info(&dev->dev, "PCI-Flash SSD discovered\n");
822
823 card = kzalloc(sizeof(*card), GFP_KERNEL);
824 if (!card)
825 return -ENOMEM;
826
827 card->dev = dev;
828 pci_set_drvdata(dev, card);
829
830 do {
831 if (!ida_pre_get(&rsxx_disk_ida, GFP_KERNEL)) {
832 st = -ENOMEM;
833 goto failed_ida_get;
834 }
835
836 spin_lock(&rsxx_ida_lock);
837 st = ida_get_new(&rsxx_disk_ida, &card->disk_id);
838 spin_unlock(&rsxx_ida_lock);
839 } while (st == -EAGAIN);
840
841 if (st)
842 goto failed_ida_get;
843
844 st = pci_enable_device(dev);
845 if (st)
846 goto failed_enable;
847
848 pci_set_master(dev);
849 pci_set_dma_max_seg_size(dev, RSXX_HW_BLK_SIZE);
850
851 st = pci_set_dma_mask(dev, DMA_BIT_MASK(64));
852 if (st) {
853 dev_err(CARD_TO_DEV(card),
854 "No usable DMA configuration,aborting\n");
855 goto failed_dma_mask;
856 }
857
858 st = pci_request_regions(dev, DRIVER_NAME);
859 if (st) {
860 dev_err(CARD_TO_DEV(card),
861 "Failed to request memory region\n");
862 goto failed_request_regions;
863 }
864
865 if (pci_resource_len(dev, 0) == 0) {
866 dev_err(CARD_TO_DEV(card), "BAR0 has length 0!\n");
867 st = -ENOMEM;
868 goto failed_iomap;
869 }
870
871 card->regmap = pci_iomap(dev, 0, 0);
872 if (!card->regmap) {
873 dev_err(CARD_TO_DEV(card), "Failed to map BAR0\n");
874 st = -ENOMEM;
875 goto failed_iomap;
876 }
877
878 spin_lock_init(&card->irq_lock);
879 card->halt = 0;
c95246c3 880 card->eeh_state = 0;
8722ff8c 881
c206c709 882 spin_lock_irq(&card->irq_lock);
8722ff8c 883 rsxx_disable_ier_and_isr(card, CR_INTR_ALL);
c206c709 884 spin_unlock_irq(&card->irq_lock);
8722ff8c 885
886 if (!force_legacy) {
887 st = pci_enable_msi(dev);
888 if (st)
889 dev_warn(CARD_TO_DEV(card),
890 "Failed to enable MSI\n");
891 }
892
893 st = request_irq(dev->irq, rsxx_isr, IRQF_DISABLED | IRQF_SHARED,
894 DRIVER_NAME, card);
895 if (st) {
896 dev_err(CARD_TO_DEV(card),
897 "Failed requesting IRQ%d\n", dev->irq);
898 goto failed_irq;
899 }
900
901 /************* Setup Processor Command Interface *************/
a3299ab1
PK		 902 st = rsxx_creg_setup(card);
903 if (st) {
904 dev_err(CARD_TO_DEV(card), "Failed to setup creg interface.\n");
905 goto failed_creg_setup;
906 }
8722ff8c 907
c206c709 908 spin_lock_irq(&card->irq_lock);
8722ff8c 909 rsxx_enable_ier_and_isr(card, CR_INTR_CREG);
c206c709 910 spin_unlock_irq(&card->irq_lock);
8722ff8c 911
912 st = rsxx_compatibility_check(card);
913 if (st) {
914 dev_warn(CARD_TO_DEV(card),
915 "Incompatible driver detected. Please update the driver.\n");
916 st = -EINVAL;
917 goto failed_compatiblity_check;
918 }
919
920 /************* Load Card Config *************/
921 st = rsxx_load_config(card);
922 if (st)
923 dev_err(CARD_TO_DEV(card),
924 "Failed loading card config\n");
925
926 /************* Setup DMA Engine *************/
927 st = rsxx_get_num_targets(card, &card->n_targets);
928 if (st)
929 dev_info(CARD_TO_DEV(card),
930 "Failed reading the number of DMA targets\n");
931
932 card->ctrl = kzalloc(card->n_targets * sizeof(*card->ctrl), GFP_KERNEL);
933 if (!card->ctrl) {
934 st = -ENOMEM;
935 goto failed_dma_setup;
936 }
937
938 st = rsxx_dma_setup(card);
939 if (st) {
940 dev_info(CARD_TO_DEV(card),
941 "Failed to setup DMA engine\n");
942 goto failed_dma_setup;
943 }
944
945 /************* Setup Card Event Handler *************/
a3299ab1
PK		 946 card->event_wq = create_singlethread_workqueue(DRIVER_NAME"_event");
947 if (!card->event_wq) {
948 dev_err(CARD_TO_DEV(card), "Failed card event setup.\n");
949 goto failed_event_handler;
950 }
951
8722ff8c 952 INIT_WORK(&card->event_work, card_event_handler);
953
954 st = rsxx_setup_dev(card);
955 if (st)
956 goto failed_create_dev;
957
958 rsxx_get_card_state(card, &card->state);
959
960 dev_info(CARD_TO_DEV(card),
961 "card state: %s\n",
962 rsxx_card_state_to_str(card->state));
963
964 /*
965 * Now that the DMA Engine and devices have been setup,
966 * we can enable the event interrupt(it kicks off actions in
967 * those layers so we couldn't enable it right away.)
968 */
c206c709 969 spin_lock_irq(&card->irq_lock);
8722ff8c 970 rsxx_enable_ier_and_isr(card, CR_INTR_EVENT);
c206c709 971 spin_unlock_irq(&card->irq_lock);
8722ff8c 972
973 if (card->state == CARD_STATE_SHUTDOWN) {
974 st = rsxx_issue_card_cmd(card, CARD_CMD_STARTUP);
975 if (st)
976 dev_crit(CARD_TO_DEV(card),
977 "Failed issuing card startup\n");
fb065cd9
PK		 978 if (sync_start) {
979 sync_timeout = SYNC_START_TIMEOUT;
980
981 dev_info(CARD_TO_DEV(card),
982 "Waiting for card to startup\n");
983
984 do {
985 ssleep(1);
986 sync_timeout--;
987
988 rsxx_get_card_state(card, &card->state);
989 } while (sync_timeout &&
990 (card->state == CARD_STATE_STARTING));
991
992 if (card->state == CARD_STATE_STARTING) {
993 dev_warn(CARD_TO_DEV(card),
994 "Card startup timed out\n");
995 card->size8 = 0;
996 } else {
997 dev_info(CARD_TO_DEV(card),
998 "card state: %s\n",
999 rsxx_card_state_to_str(card->state));
1000 st = rsxx_get_card_size8(card, &card->size8);
1001 if (st)
1002 card->size8 = 0;
1003 }
1004 }
8722ff8c 1005 } else if (card->state == CARD_STATE_GOOD ||
1006 card->state == CARD_STATE_RD_ONLY_FAULT) {
1007 st = rsxx_get_card_size8(card, &card->size8);
1008 if (st)
1009 card->size8 = 0;
1010 }
1011
1012 rsxx_attach_dev(card);
1013
36f988e9
PK		 1014 /************* Setup Debugfs *************/
1015 rsxx_debugfs_dev_new(card);
1016
8722ff8c 1017 return 0;
1018
1019failed_create_dev:
a3299ab1
PK		 1020 destroy_workqueue(card->event_wq);
1021 card->event_wq = NULL;
1022failed_event_handler:
8722ff8c 1023 rsxx_dma_destroy(card);
1024failed_dma_setup:
1025failed_compatiblity_check:
a3299ab1
PK		 1026 destroy_workqueue(card->creg_ctrl.creg_wq);
1027 card->creg_ctrl.creg_wq = NULL;
1028failed_creg_setup:
c206c709 1029 spin_lock_irq(&card->irq_lock);
8722ff8c 1030 rsxx_disable_ier_and_isr(card, CR_INTR_ALL);
c206c709 1031 spin_unlock_irq(&card->irq_lock);
8722ff8c 1032 free_irq(dev->irq, card);
1033 if (!force_legacy)
1034 pci_disable_msi(dev);
1035failed_irq:
1036 pci_iounmap(dev, card->regmap);
1037failed_iomap:
1038 pci_release_regions(dev);
1039failed_request_regions:
1040failed_dma_mask:
1041 pci_disable_device(dev);
1042failed_enable:
1043 spin_lock(&rsxx_ida_lock);
1044 ida_remove(&rsxx_disk_ida, card->disk_id);
1045 spin_unlock(&rsxx_ida_lock);
1046failed_ida_get:
1047 kfree(card);
1048
1049 return st;
1050}
1051
82bed4d5 1052static void rsxx_pci_remove(struct pci_dev *dev)
8722ff8c 1053{
1054 struct rsxx_cardinfo *card = pci_get_drvdata(dev);
1055 unsigned long flags;
1056 int st;
1057 int i;
1058
1059 if (!card)
1060 return;
1061
1062 dev_info(CARD_TO_DEV(card),
1063 "Removing PCI-Flash SSD.\n");
1064
1065 rsxx_detach_dev(card);
1066
1067 for (i = 0; i < card->n_targets; i++) {
1068 spin_lock_irqsave(&card->irq_lock, flags);
1069 rsxx_disable_ier_and_isr(card, CR_INTR_DMA(i));
1070 spin_unlock_irqrestore(&card->irq_lock, flags);
1071 }
1072
1073 st = card_shutdown(card);
1074 if (st)
1075 dev_crit(CARD_TO_DEV(card), "Shutdown failed!\n");
1076
1077 /* Sync outstanding event handlers. */
1078 spin_lock_irqsave(&card->irq_lock, flags);
1079 rsxx_disable_ier_and_isr(card, CR_INTR_EVENT);
1080 spin_unlock_irqrestore(&card->irq_lock, flags);
1081
8722ff8c 1082 cancel_work_sync(&card->event_work);
1083
1084 rsxx_destroy_dev(card);
1085 rsxx_dma_destroy(card);
1086
1087 spin_lock_irqsave(&card->irq_lock, flags);
1088 rsxx_disable_ier_and_isr(card, CR_INTR_ALL);
1089 spin_unlock_irqrestore(&card->irq_lock, flags);
1ebfd109
PK		 1090
1091 /* Prevent work_structs from re-queuing themselves. */
1092 card->halt = 1;
1093
36f988e9
PK		 1094 debugfs_remove_recursive(card->debugfs_dir);
1095
8722ff8c 1096 free_irq(dev->irq, card);
1097
1098 if (!force_legacy)
1099 pci_disable_msi(dev);
1100
1101 rsxx_creg_destroy(card);
1102
1103 pci_iounmap(dev, card->regmap);
1104
1105 pci_disable_device(dev);
1106 pci_release_regions(dev);
1107
1108 kfree(card);
1109}
1110
1111static int rsxx_pci_suspend(struct pci_dev *dev, pm_message_t state)
1112{
1113 /* We don't support suspend at this time. */
1114 return -ENOSYS;
1115}
1116
1117static void rsxx_pci_shutdown(struct pci_dev *dev)
1118{
1119 struct rsxx_cardinfo *card = pci_get_drvdata(dev);
1120 unsigned long flags;
1121 int i;
1122
1123 if (!card)
1124 return;
1125
1126 dev_info(CARD_TO_DEV(card), "Shutting down PCI-Flash SSD.\n");
1127
1128 rsxx_detach_dev(card);
1129
1130 for (i = 0; i < card->n_targets; i++) {
1131 spin_lock_irqsave(&card->irq_lock, flags);
1132 rsxx_disable_ier_and_isr(card, CR_INTR_DMA(i));
1133 spin_unlock_irqrestore(&card->irq_lock, flags);
1134 }
1135
1136 card_shutdown(card);
1137}
1138
c95246c3
PK		 1139static const struct pci_error_handlers rsxx_err_handler = {
1140 .error_detected = rsxx_error_detected,
1141 .slot_reset = rsxx_slot_reset,
1142};
1143
8722ff8c 1144static DEFINE_PCI_DEVICE_TABLE(rsxx_pci_ids) = {
9bb3c446
PK		 1145 {PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_FS70_FLASH)},
1146 {PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_FS80_FLASH)},
8722ff8c 1147 {0,},
1148};
1149
1150MODULE_DEVICE_TABLE(pci, rsxx_pci_ids);
1151
1152static struct pci_driver rsxx_pci_driver = {
1153 .name = DRIVER_NAME,
1154 .id_table = rsxx_pci_ids,
1155 .probe = rsxx_pci_probe,
82bed4d5 1156 .remove = rsxx_pci_remove,
8722ff8c 1157 .suspend = rsxx_pci_suspend,
1158 .shutdown = rsxx_pci_shutdown,
c95246c3 1159 .err_handler = &rsxx_err_handler,
8722ff8c 1160};
1161
1162static int __init rsxx_core_init(void)
1163{
1164 int st;
1165
1166 st = rsxx_dev_init();
1167 if (st)
1168 return st;
1169
1170 st = rsxx_dma_init();
1171 if (st)
1172 goto dma_init_failed;
1173
1174 st = rsxx_creg_init();
1175 if (st)
1176 goto creg_init_failed;
1177
1178 return pci_register_driver(&rsxx_pci_driver);
1179
1180creg_init_failed:
1181 rsxx_dma_cleanup();
1182dma_init_failed:
1183 rsxx_dev_cleanup();
1184
1185 return st;
1186}
1187
1188static void __exit rsxx_core_cleanup(void)
1189{
1190 pci_unregister_driver(&rsxx_pci_driver);
1191 rsxx_creg_cleanup();
1192 rsxx_dma_cleanup();
1193 rsxx_dev_cleanup();
1194}
1195
1196module_init(rsxx_core_init);
1197module_exit(rsxx_core_cleanup);
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