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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / block / rsxx / core.c
blob10f6368117d8142e9e2275b479467f76c12c776d
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Filename: core.c
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
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/interrupt.h>
14 #include <linux/module.h>
15 #include <linux/pci.h>
16 #include <linux/reboot.h>
17 #include <linux/slab.h>
18 #include <linux/bitops.h>
19 #include <linux/delay.h>
20 #include <linux/debugfs.h>
21 #include <linux/seq_file.h>
22
23 #include <linux/genhd.h>
24 #include <linux/idr.h>
25
26 #include "rsxx_priv.h"
27 #include "rsxx_cfg.h"
28
29 #define NO_LEGACY 0
30 #define SYNC_START_TIMEOUT (10 * 60) /* 10 minutes */
31
32 MODULE_DESCRIPTION("IBM Flash Adapter 900GB Full Height Device Driver");
33 MODULE_AUTHOR("Joshua Morris/Philip Kelleher, IBM");
34 MODULE_LICENSE("GPL");
35 MODULE_VERSION(DRIVER_VERSION);
36
37 static unsigned int force_legacy = NO_LEGACY;
38 module_param(force_legacy, uint, 0444);
39 MODULE_PARM_DESC(force_legacy, "Force the use of legacy type PCI interrupts");
40
41 static unsigned int sync_start = 1;
42 module_param(sync_start, uint, 0444);
43 MODULE_PARM_DESC(sync_start, "On by Default: Driver load will not complete "
44 "until the card startup has completed.");
45
46 static DEFINE_IDA(rsxx_disk_ida);
47
48 /* --------------------Debugfs Setup ------------------- */
49
50 static int rsxx_attr_pci_regs_show(struct seq_file *m, void *p)
51 {
52 struct rsxx_cardinfo *card = m->private;
53
54 seq_printf(m, "HWID 0x%08x\n",
55 ioread32(card->regmap + HWID));
56 seq_printf(m, "SCRATCH 0x%08x\n",
57 ioread32(card->regmap + SCRATCH));
58 seq_printf(m, "IER 0x%08x\n",
59 ioread32(card->regmap + IER));
60 seq_printf(m, "IPR 0x%08x\n",
61 ioread32(card->regmap + IPR));
62 seq_printf(m, "CREG_CMD 0x%08x\n",
63 ioread32(card->regmap + CREG_CMD));
64 seq_printf(m, "CREG_ADD 0x%08x\n",
65 ioread32(card->regmap + CREG_ADD));
66 seq_printf(m, "CREG_CNT 0x%08x\n",
67 ioread32(card->regmap + CREG_CNT));
68 seq_printf(m, "CREG_STAT 0x%08x\n",
69 ioread32(card->regmap + CREG_STAT));
70 seq_printf(m, "CREG_DATA0 0x%08x\n",
71 ioread32(card->regmap + CREG_DATA0));
72 seq_printf(m, "CREG_DATA1 0x%08x\n",
73 ioread32(card->regmap + CREG_DATA1));
74 seq_printf(m, "CREG_DATA2 0x%08x\n",
75 ioread32(card->regmap + CREG_DATA2));
76 seq_printf(m, "CREG_DATA3 0x%08x\n",
77 ioread32(card->regmap + CREG_DATA3));
78 seq_printf(m, "CREG_DATA4 0x%08x\n",
79 ioread32(card->regmap + CREG_DATA4));
80 seq_printf(m, "CREG_DATA5 0x%08x\n",
81 ioread32(card->regmap + CREG_DATA5));
82 seq_printf(m, "CREG_DATA6 0x%08x\n",
83 ioread32(card->regmap + CREG_DATA6));
84 seq_printf(m, "CREG_DATA7 0x%08x\n",
85 ioread32(card->regmap + CREG_DATA7));
86 seq_printf(m, "INTR_COAL 0x%08x\n",
87 ioread32(card->regmap + INTR_COAL));
88 seq_printf(m, "HW_ERROR 0x%08x\n",
89 ioread32(card->regmap + HW_ERROR));
90 seq_printf(m, "DEBUG0 0x%08x\n",
91 ioread32(card->regmap + PCI_DEBUG0));
92 seq_printf(m, "DEBUG1 0x%08x\n",
93 ioread32(card->regmap + PCI_DEBUG1));
94 seq_printf(m, "DEBUG2 0x%08x\n",
95 ioread32(card->regmap + PCI_DEBUG2));
96 seq_printf(m, "DEBUG3 0x%08x\n",
97 ioread32(card->regmap + PCI_DEBUG3));
98 seq_printf(m, "DEBUG4 0x%08x\n",
99 ioread32(card->regmap + PCI_DEBUG4));
100 seq_printf(m, "DEBUG5 0x%08x\n",
101 ioread32(card->regmap + PCI_DEBUG5));
102 seq_printf(m, "DEBUG6 0x%08x\n",
103 ioread32(card->regmap + PCI_DEBUG6));
104 seq_printf(m, "DEBUG7 0x%08x\n",
105 ioread32(card->regmap + PCI_DEBUG7));
106 seq_printf(m, "RECONFIG 0x%08x\n",
107 ioread32(card->regmap + PCI_RECONFIG));
108
109 return 0;
110 }
111
112 static int rsxx_attr_stats_show(struct seq_file *m, void *p)
113 {
114 struct rsxx_cardinfo *card = m->private;
115 int i;
116
117 for (i = 0; i < card->n_targets; i++) {
118 seq_printf(m, "Ctrl %d CRC Errors = %d\n",
119 i, card->ctrl[i].stats.crc_errors);
120 seq_printf(m, "Ctrl %d Hard Errors = %d\n",
121 i, card->ctrl[i].stats.hard_errors);
122 seq_printf(m, "Ctrl %d Soft Errors = %d\n",
123 i, card->ctrl[i].stats.soft_errors);
124 seq_printf(m, "Ctrl %d Writes Issued = %d\n",
125 i, card->ctrl[i].stats.writes_issued);
126 seq_printf(m, "Ctrl %d Writes Failed = %d\n",
127 i, card->ctrl[i].stats.writes_failed);
128 seq_printf(m, "Ctrl %d Reads Issued = %d\n",
129 i, card->ctrl[i].stats.reads_issued);
130 seq_printf(m, "Ctrl %d Reads Failed = %d\n",
131 i, card->ctrl[i].stats.reads_failed);
132 seq_printf(m, "Ctrl %d Reads Retried = %d\n",
133 i, card->ctrl[i].stats.reads_retried);
134 seq_printf(m, "Ctrl %d Discards Issued = %d\n",
135 i, card->ctrl[i].stats.discards_issued);
136 seq_printf(m, "Ctrl %d Discards Failed = %d\n",
137 i, card->ctrl[i].stats.discards_failed);
138 seq_printf(m, "Ctrl %d DMA SW Errors = %d\n",
139 i, card->ctrl[i].stats.dma_sw_err);
140 seq_printf(m, "Ctrl %d DMA HW Faults = %d\n",
141 i, card->ctrl[i].stats.dma_hw_fault);
142 seq_printf(m, "Ctrl %d DMAs Cancelled = %d\n",
143 i, card->ctrl[i].stats.dma_cancelled);
144 seq_printf(m, "Ctrl %d SW Queue Depth = %d\n",
145 i, card->ctrl[i].stats.sw_q_depth);
146 seq_printf(m, "Ctrl %d HW Queue Depth = %d\n",
147 i, atomic_read(&card->ctrl[i].stats.hw_q_depth));
148 }
149
150 return 0;
151 }
152
153 static int rsxx_attr_stats_open(struct inode *inode, struct file *file)
154 {
155 return single_open(file, rsxx_attr_stats_show, inode->i_private);
156 }
157
158 static int rsxx_attr_pci_regs_open(struct inode *inode, struct file *file)
159 {
160 return single_open(file, rsxx_attr_pci_regs_show, inode->i_private);
161 }
162
163 static ssize_t rsxx_cram_read(struct file *fp, char __user *ubuf,
164 size_t cnt, loff_t *ppos)
165 {
166 struct rsxx_cardinfo *card = file_inode(fp)->i_private;
167 char *buf;
168 ssize_t st;
169
170 buf = kzalloc(cnt, GFP_KERNEL);
171 if (!buf)
172 return -ENOMEM;
173
174 st = rsxx_creg_read(card, CREG_ADD_CRAM + (u32)*ppos, cnt, buf, 1);
175 if (!st)
176 st = copy_to_user(ubuf, buf, cnt);
177 kfree(buf);
178 if (st)
179 return st;
180 *ppos += cnt;
181 return cnt;
182 }
183
184 static ssize_t rsxx_cram_write(struct file *fp, const char __user *ubuf,
185 size_t cnt, loff_t *ppos)
186 {
187 struct rsxx_cardinfo *card = file_inode(fp)->i_private;
188 char *buf;
189 ssize_t st;
190
191 buf = memdup_user(ubuf, cnt);
192 if (IS_ERR(buf))
193 return PTR_ERR(buf);
194
195 st = rsxx_creg_write(card, CREG_ADD_CRAM + (u32)*ppos, cnt, buf, 1);
196 kfree(buf);
197 if (st)
198 return st;
199 *ppos += cnt;
200 return cnt;
201 }
202
203 static const struct file_operations debugfs_cram_fops = {
204 .owner = THIS_MODULE,
205 .read = rsxx_cram_read,
206 .write = rsxx_cram_write,
207 };
208
209 static const struct file_operations debugfs_stats_fops = {
210 .owner = THIS_MODULE,
211 .open = rsxx_attr_stats_open,
212 .read = seq_read,
213 .llseek = seq_lseek,
214 .release = single_release,
215 };
216
217 static const struct file_operations debugfs_pci_regs_fops = {
218 .owner = THIS_MODULE,
219 .open = rsxx_attr_pci_regs_open,
220 .read = seq_read,
221 .llseek = seq_lseek,
222 .release = single_release,
223 };
224
225 static void rsxx_debugfs_dev_new(struct rsxx_cardinfo *card)
226 {
227 struct dentry *debugfs_stats;
228 struct dentry *debugfs_pci_regs;
229 struct dentry *debugfs_cram;
230
231 card->debugfs_dir = debugfs_create_dir(card->gendisk->disk_name, NULL);
232 if (IS_ERR_OR_NULL(card->debugfs_dir))
233 goto failed_debugfs_dir;
234
235 debugfs_stats = debugfs_create_file("stats", 0444,
236 card->debugfs_dir, card,
237 &debugfs_stats_fops);
238 if (IS_ERR_OR_NULL(debugfs_stats))
239 goto failed_debugfs_stats;
240
241 debugfs_pci_regs = debugfs_create_file("pci_regs", 0444,
242 card->debugfs_dir, card,
243 &debugfs_pci_regs_fops);
244 if (IS_ERR_OR_NULL(debugfs_pci_regs))
245 goto failed_debugfs_pci_regs;
246
247 debugfs_cram = debugfs_create_file("cram", 0644,
248 card->debugfs_dir, card,
249 &debugfs_cram_fops);
250 if (IS_ERR_OR_NULL(debugfs_cram))
251 goto failed_debugfs_cram;
252
253 return;
254 failed_debugfs_cram:
255 debugfs_remove(debugfs_pci_regs);
256 failed_debugfs_pci_regs:
257 debugfs_remove(debugfs_stats);
258 failed_debugfs_stats:
259 debugfs_remove(card->debugfs_dir);
260 failed_debugfs_dir:
261 card->debugfs_dir = NULL;
262 }
263
264 /*----------------- Interrupt Control & Handling -------------------*/
265
266 static void rsxx_mask_interrupts(struct rsxx_cardinfo *card)
267 {
268 card->isr_mask = 0;
269 card->ier_mask = 0;
270 }
271
272 static void __enable_intr(unsigned int *mask, unsigned int intr)
273 {
274 *mask |= intr;
275 }
276
277 static void __disable_intr(unsigned int *mask, unsigned int intr)
278 {
279 *mask &= ~intr;
280 }
281
282 /*
283 * NOTE: Disabling the IER will disable the hardware interrupt.
284 * Disabling the ISR will disable the software handling of the ISR bit.
285 *
286 * Enable/Disable interrupt functions assume the card->irq_lock
287 * is held by the caller.
288 */
289 void rsxx_enable_ier(struct rsxx_cardinfo *card, unsigned int intr)
290 {
291 if (unlikely(card->halt) ||
292 unlikely(card->eeh_state))
293 return;
294
295 __enable_intr(&card->ier_mask, intr);
296 iowrite32(card->ier_mask, card->regmap + IER);
297 }
298
299 void rsxx_disable_ier(struct rsxx_cardinfo *card, unsigned int intr)
300 {
301 if (unlikely(card->eeh_state))
302 return;
303
304 __disable_intr(&card->ier_mask, intr);
305 iowrite32(card->ier_mask, card->regmap + IER);
306 }
307
308 void rsxx_enable_ier_and_isr(struct rsxx_cardinfo *card,
309 unsigned int intr)
310 {
311 if (unlikely(card->halt) ||
312 unlikely(card->eeh_state))
313 return;
314
315 __enable_intr(&card->isr_mask, intr);
316 __enable_intr(&card->ier_mask, intr);
317 iowrite32(card->ier_mask, card->regmap + IER);
318 }
319 void rsxx_disable_ier_and_isr(struct rsxx_cardinfo *card,
320 unsigned int intr)
321 {
322 if (unlikely(card->eeh_state))
323 return;
324
325 __disable_intr(&card->isr_mask, intr);
326 __disable_intr(&card->ier_mask, intr);
327 iowrite32(card->ier_mask, card->regmap + IER);
328 }
329
330 static irqreturn_t rsxx_isr(int irq, void *pdata)
331 {
332 struct rsxx_cardinfo *card = pdata;
333 unsigned int isr;
334 int handled = 0;
335 int reread_isr;
336 int i;
337
338 spin_lock(&card->irq_lock);
339
340 do {
341 reread_isr = 0;
342
343 if (unlikely(card->eeh_state))
344 break;
345
346 isr = ioread32(card->regmap + ISR);
347 if (isr == 0xffffffff) {
348 /*
349 * A few systems seem to have an intermittent issue
350 * where PCI reads return all Fs, but retrying the read
351 * a little later will return as expected.
352 */
353 dev_info(CARD_TO_DEV(card),
354 "ISR = 0xFFFFFFFF, retrying later\n");
355 break;
356 }
357
358 isr &= card->isr_mask;
359 if (!isr)
360 break;
361
362 for (i = 0; i < card->n_targets; i++) {
363 if (isr & CR_INTR_DMA(i)) {
364 if (card->ier_mask & CR_INTR_DMA(i)) {
365 rsxx_disable_ier(card, CR_INTR_DMA(i));
366 reread_isr = 1;
367 }
368 queue_work(card->ctrl[i].done_wq,
369 &card->ctrl[i].dma_done_work);
370 handled++;
371 }
372 }
373
374 if (isr & CR_INTR_CREG) {
375 queue_work(card->creg_ctrl.creg_wq,
376 &card->creg_ctrl.done_work);
377 handled++;
378 }
379
380 if (isr & CR_INTR_EVENT) {
381 queue_work(card->event_wq, &card->event_work);
382 rsxx_disable_ier_and_isr(card, CR_INTR_EVENT);
383 handled++;
384 }
385 } while (reread_isr);
386
387 spin_unlock(&card->irq_lock);
388
389 return handled ? IRQ_HANDLED : IRQ_NONE;
390 }
391
392 /*----------------- Card Event Handler -------------------*/
393 static const char * const rsxx_card_state_to_str(unsigned int state)
394 {
395 static const char * const state_strings[] = {
396 "Unknown", "Shutdown", "Starting", "Formatting",
397 "Uninitialized", "Good", "Shutting Down",
398 "Fault", "Read Only Fault", "dStroying"
399 };
400
401 return state_strings[ffs(state)];
402 }
403
404 static void card_state_change(struct rsxx_cardinfo *card,
405 unsigned int new_state)
406 {
407 int st;
408
409 dev_info(CARD_TO_DEV(card),
410 "card state change detected.(%s -> %s)\n",
411 rsxx_card_state_to_str(card->state),
412 rsxx_card_state_to_str(new_state));
413
414 card->state = new_state;
415
416 /* Don't attach DMA interfaces if the card has an invalid config */
417 if (!card->config_valid)
418 return;
419
420 switch (new_state) {
421 case CARD_STATE_RD_ONLY_FAULT:
422 dev_crit(CARD_TO_DEV(card),
423 "Hardware has entered read-only mode!\n");
424 /*
425 * Fall through so the DMA devices can be attached and
426 * the user can attempt to pull off their data.
427 */
428 /* fall through */
429 case CARD_STATE_GOOD:
430 st = rsxx_get_card_size8(card, &card->size8);
431 if (st)
432 dev_err(CARD_TO_DEV(card),
433 "Failed attaching DMA devices\n");
434
435 if (card->config_valid)
436 set_capacity(card->gendisk, card->size8 >> 9);
437 break;
438
439 case CARD_STATE_FAULT:
440 dev_crit(CARD_TO_DEV(card),
441 "Hardware Fault reported!\n");
442 /* Fall through. */
443
444 /* Everything else, detach DMA interface if it's attached. */
445 case CARD_STATE_SHUTDOWN:
446 case CARD_STATE_STARTING:
447 case CARD_STATE_FORMATTING:
448 case CARD_STATE_UNINITIALIZED:
449 case CARD_STATE_SHUTTING_DOWN:
450 /*
451 * dStroy is a term coined by marketing to represent the low level
452 * secure erase.
453 */
454 case CARD_STATE_DSTROYING:
455 set_capacity(card->gendisk, 0);
456 break;
457 }
458 }
459
460 static void card_event_handler(struct work_struct *work)
461 {
462 struct rsxx_cardinfo *card;
463 unsigned int state;
464 unsigned long flags;
465 int st;
466
467 card = container_of(work, struct rsxx_cardinfo, event_work);
468
469 if (unlikely(card->halt))
470 return;
471
472 /*
473 * Enable the interrupt now to avoid any weird race conditions where a
474 * state change might occur while rsxx_get_card_state() is
475 * processing a returned creg cmd.
476 */
477 spin_lock_irqsave(&card->irq_lock, flags);
478 rsxx_enable_ier_and_isr(card, CR_INTR_EVENT);
479 spin_unlock_irqrestore(&card->irq_lock, flags);
480
481 st = rsxx_get_card_state(card, &state);
482 if (st) {
483 dev_info(CARD_TO_DEV(card),
484 "Failed reading state after event.\n");
485 return;
486 }
487
488 if (card->state != state)
489 card_state_change(card, state);
490
491 if (card->creg_ctrl.creg_stats.stat & CREG_STAT_LOG_PENDING)
492 rsxx_read_hw_log(card);
493 }
494
495 /*----------------- Card Operations -------------------*/
496 static int card_shutdown(struct rsxx_cardinfo *card)
497 {
498 unsigned int state;
499 signed long start;
500 const int timeout = msecs_to_jiffies(120000);
501 int st;
502
503 /* We can't issue a shutdown if the card is in a transition state */
504 start = jiffies;
505 do {
506 st = rsxx_get_card_state(card, &state);
507 if (st)
508 return st;
509 } while (state == CARD_STATE_STARTING &&
510 (jiffies - start < timeout));
511
512 if (state == CARD_STATE_STARTING)
513 return -ETIMEDOUT;
514
515 /* Only issue a shutdown if we need to */
516 if ((state != CARD_STATE_SHUTTING_DOWN) &&
517 (state != CARD_STATE_SHUTDOWN)) {
518 st = rsxx_issue_card_cmd(card, CARD_CMD_SHUTDOWN);
519 if (st)
520 return st;
521 }
522
523 start = jiffies;
524 do {
525 st = rsxx_get_card_state(card, &state);
526 if (st)
527 return st;
528 } while (state != CARD_STATE_SHUTDOWN &&
529 (jiffies - start < timeout));
530
531 if (state != CARD_STATE_SHUTDOWN)
532 return -ETIMEDOUT;
533
534 return 0;
535 }
536
537 static int rsxx_eeh_frozen(struct pci_dev *dev)
538 {
539 struct rsxx_cardinfo *card = pci_get_drvdata(dev);
540 int i;
541 int st;
542
543 dev_warn(&dev->dev, "IBM Flash Adapter PCI: preparing for slot reset.\n");
544
545 card->eeh_state = 1;
546 rsxx_mask_interrupts(card);
547
548 /*
549 * We need to guarantee that the write for eeh_state and masking
550 * interrupts does not become reordered. This will prevent a possible
551 * race condition with the EEH code.
552 */
553 wmb();
554
555 pci_disable_device(dev);
556
557 st = rsxx_eeh_save_issued_dmas(card);
558 if (st)
559 return st;
560
561 rsxx_eeh_save_issued_creg(card);
562
563 for (i = 0; i < card->n_targets; i++) {
564 if (card->ctrl[i].status.buf)
565 pci_free_consistent(card->dev, STATUS_BUFFER_SIZE8,
566 card->ctrl[i].status.buf,
567 card->ctrl[i].status.dma_addr);
568 if (card->ctrl[i].cmd.buf)
569 pci_free_consistent(card->dev, COMMAND_BUFFER_SIZE8,
570 card->ctrl[i].cmd.buf,
571 card->ctrl[i].cmd.dma_addr);
572 }
573
574 return 0;
575 }
576
577 static void rsxx_eeh_failure(struct pci_dev *dev)
578 {
579 struct rsxx_cardinfo *card = pci_get_drvdata(dev);
580 int i;
581 int cnt = 0;
582
583 dev_err(&dev->dev, "IBM Flash Adapter PCI: disabling failed card.\n");
584
585 card->eeh_state = 1;
586 card->halt = 1;
587
588 for (i = 0; i < card->n_targets; i++) {
589 spin_lock_bh(&card->ctrl[i].queue_lock);
590 cnt = rsxx_cleanup_dma_queue(&card->ctrl[i],
591 &card->ctrl[i].queue,
592 COMPLETE_DMA);
593 spin_unlock_bh(&card->ctrl[i].queue_lock);
594
595 cnt += rsxx_dma_cancel(&card->ctrl[i]);
596
597 if (cnt)
598 dev_info(CARD_TO_DEV(card),
599 "Freed %d queued DMAs on channel %d\n",
600 cnt, card->ctrl[i].id);
601 }
602 }
603
604 static int rsxx_eeh_fifo_flush_poll(struct rsxx_cardinfo *card)
605 {
606 unsigned int status;
607 int iter = 0;
608
609 /* We need to wait for the hardware to reset */
610 while (iter++ < 10) {
611 status = ioread32(card->regmap + PCI_RECONFIG);
612
613 if (status & RSXX_FLUSH_BUSY) {
614 ssleep(1);
615 continue;
616 }
617
618 if (status & RSXX_FLUSH_TIMEOUT)
619 dev_warn(CARD_TO_DEV(card), "HW: flash controller timeout\n");
620 return 0;
621 }
622
623 /* Hardware failed resetting itself. */
624 return -1;
625 }
626
627 static pci_ers_result_t rsxx_error_detected(struct pci_dev *dev,
628 enum pci_channel_state error)
629 {
630 int st;
631
632 if (dev->revision < RSXX_EEH_SUPPORT)
633 return PCI_ERS_RESULT_NONE;
634
635 if (error == pci_channel_io_perm_failure) {
636 rsxx_eeh_failure(dev);
637 return PCI_ERS_RESULT_DISCONNECT;
638 }
639
640 st = rsxx_eeh_frozen(dev);
641 if (st) {
642 dev_err(&dev->dev, "Slot reset setup failed\n");
643 rsxx_eeh_failure(dev);
644 return PCI_ERS_RESULT_DISCONNECT;
645 }
646
647 return PCI_ERS_RESULT_NEED_RESET;
648 }
649
650 static pci_ers_result_t rsxx_slot_reset(struct pci_dev *dev)
651 {
652 struct rsxx_cardinfo *card = pci_get_drvdata(dev);
653 unsigned long flags;
654 int i;
655 int st;
656
657 dev_warn(&dev->dev,
658 "IBM Flash Adapter PCI: recovering from slot reset.\n");
659
660 st = pci_enable_device(dev);
661 if (st)
662 goto failed_hw_setup;
663
664 pci_set_master(dev);
665
666 st = rsxx_eeh_fifo_flush_poll(card);
667 if (st)
668 goto failed_hw_setup;
669
670 rsxx_dma_queue_reset(card);
671
672 for (i = 0; i < card->n_targets; i++) {
673 st = rsxx_hw_buffers_init(dev, &card->ctrl[i]);
674 if (st)
675 goto failed_hw_buffers_init;
676 }
677
678 if (card->config_valid)
679 rsxx_dma_configure(card);
680
681 /* Clears the ISR register from spurious interrupts */
682 st = ioread32(card->regmap + ISR);
683
684 card->eeh_state = 0;
685
686 spin_lock_irqsave(&card->irq_lock, flags);
687 if (card->n_targets & RSXX_MAX_TARGETS)
688 rsxx_enable_ier_and_isr(card, CR_INTR_ALL_G);
689 else
690 rsxx_enable_ier_and_isr(card, CR_INTR_ALL_C);
691 spin_unlock_irqrestore(&card->irq_lock, flags);
692
693 rsxx_kick_creg_queue(card);
694
695 for (i = 0; i < card->n_targets; i++) {
696 spin_lock(&card->ctrl[i].queue_lock);
697 if (list_empty(&card->ctrl[i].queue)) {
698 spin_unlock(&card->ctrl[i].queue_lock);
699 continue;
700 }
701 spin_unlock(&card->ctrl[i].queue_lock);
702
703 queue_work(card->ctrl[i].issue_wq,
704 &card->ctrl[i].issue_dma_work);
705 }
706
707 dev_info(&dev->dev, "IBM Flash Adapter PCI: recovery complete.\n");
708
709 return PCI_ERS_RESULT_RECOVERED;
710
711 failed_hw_buffers_init:
712 for (i = 0; i < card->n_targets; i++) {
713 if (card->ctrl[i].status.buf)
714 pci_free_consistent(card->dev,
715 STATUS_BUFFER_SIZE8,
716 card->ctrl[i].status.buf,
717 card->ctrl[i].status.dma_addr);
718 if (card->ctrl[i].cmd.buf)
719 pci_free_consistent(card->dev,
720 COMMAND_BUFFER_SIZE8,
721 card->ctrl[i].cmd.buf,
722 card->ctrl[i].cmd.dma_addr);
723 }
724 failed_hw_setup:
725 rsxx_eeh_failure(dev);
726 return PCI_ERS_RESULT_DISCONNECT;
727
728 }
729
730 /*----------------- Driver Initialization & Setup -------------------*/
731 /* Returns: 0 if the driver is compatible with the device
732 -1 if the driver is NOT compatible with the device */
733 static int rsxx_compatibility_check(struct rsxx_cardinfo *card)
734 {
735 unsigned char pci_rev;
736
737 pci_read_config_byte(card->dev, PCI_REVISION_ID, &pci_rev);
738
739 if (pci_rev > RS70_PCI_REV_SUPPORTED)
740 return -1;
741 return 0;
742 }
743
744 static int rsxx_pci_probe(struct pci_dev *dev,
745 const struct pci_device_id *id)
746 {
747 struct rsxx_cardinfo *card;
748 int st;
749 unsigned int sync_timeout;
750
751 dev_info(&dev->dev, "PCI-Flash SSD discovered\n");
752
753 card = kzalloc(sizeof(*card), GFP_KERNEL);
754 if (!card)
755 return -ENOMEM;
756
757 card->dev = dev;
758 pci_set_drvdata(dev, card);
759
760 st = ida_alloc(&rsxx_disk_ida, GFP_KERNEL);
761 if (st < 0)
762 goto failed_ida_get;
763 card->disk_id = st;
764
765 st = pci_enable_device(dev);
766 if (st)
767 goto failed_enable;
768
769 pci_set_master(dev);
770
771 st = dma_set_mask(&dev->dev, DMA_BIT_MASK(64));
772 if (st) {
773 dev_err(CARD_TO_DEV(card),
774 "No usable DMA configuration,aborting\n");
775 goto failed_dma_mask;
776 }
777
778 st = pci_request_regions(dev, DRIVER_NAME);
779 if (st) {
780 dev_err(CARD_TO_DEV(card),
781 "Failed to request memory region\n");
782 goto failed_request_regions;
783 }
784
785 if (pci_resource_len(dev, 0) == 0) {
786 dev_err(CARD_TO_DEV(card), "BAR0 has length 0!\n");
787 st = -ENOMEM;
788 goto failed_iomap;
789 }
790
791 card->regmap = pci_iomap(dev, 0, 0);
792 if (!card->regmap) {
793 dev_err(CARD_TO_DEV(card), "Failed to map BAR0\n");
794 st = -ENOMEM;
795 goto failed_iomap;
796 }
797
798 spin_lock_init(&card->irq_lock);
799 card->halt = 0;
800 card->eeh_state = 0;
801
802 spin_lock_irq(&card->irq_lock);
803 rsxx_disable_ier_and_isr(card, CR_INTR_ALL);
804 spin_unlock_irq(&card->irq_lock);
805
806 if (!force_legacy) {
807 st = pci_enable_msi(dev);
808 if (st)
809 dev_warn(CARD_TO_DEV(card),
810 "Failed to enable MSI\n");
811 }
812
813 st = request_irq(dev->irq, rsxx_isr, IRQF_SHARED,
814 DRIVER_NAME, card);
815 if (st) {
816 dev_err(CARD_TO_DEV(card),
817 "Failed requesting IRQ%d\n", dev->irq);
818 goto failed_irq;
819 }
820
821 /************* Setup Processor Command Interface *************/
822 st = rsxx_creg_setup(card);
823 if (st) {
824 dev_err(CARD_TO_DEV(card), "Failed to setup creg interface.\n");
825 goto failed_creg_setup;
826 }
827
828 spin_lock_irq(&card->irq_lock);
829 rsxx_enable_ier_and_isr(card, CR_INTR_CREG);
830 spin_unlock_irq(&card->irq_lock);
831
832 st = rsxx_compatibility_check(card);
833 if (st) {
834 dev_warn(CARD_TO_DEV(card),
835 "Incompatible driver detected. Please update the driver.\n");
836 st = -EINVAL;
837 goto failed_compatiblity_check;
838 }
839
840 /************* Load Card Config *************/
841 st = rsxx_load_config(card);
842 if (st)
843 dev_err(CARD_TO_DEV(card),
844 "Failed loading card config\n");
845
846 /************* Setup DMA Engine *************/
847 st = rsxx_get_num_targets(card, &card->n_targets);
848 if (st)
849 dev_info(CARD_TO_DEV(card),
850 "Failed reading the number of DMA targets\n");
851
852 card->ctrl = kcalloc(card->n_targets, sizeof(*card->ctrl),
853 GFP_KERNEL);
854 if (!card->ctrl) {
855 st = -ENOMEM;
856 goto failed_dma_setup;
857 }
858
859 st = rsxx_dma_setup(card);
860 if (st) {
861 dev_info(CARD_TO_DEV(card),
862 "Failed to setup DMA engine\n");
863 goto failed_dma_setup;
864 }
865
866 /************* Setup Card Event Handler *************/
867 card->event_wq = create_singlethread_workqueue(DRIVER_NAME"_event");
868 if (!card->event_wq) {
869 dev_err(CARD_TO_DEV(card), "Failed card event setup.\n");
870 goto failed_event_handler;
871 }
872
873 INIT_WORK(&card->event_work, card_event_handler);
874
875 st = rsxx_setup_dev(card);
876 if (st)
877 goto failed_create_dev;
878
879 rsxx_get_card_state(card, &card->state);
880
881 dev_info(CARD_TO_DEV(card),
882 "card state: %s\n",
883 rsxx_card_state_to_str(card->state));
884
885 /*
886 * Now that the DMA Engine and devices have been setup,
887 * we can enable the event interrupt(it kicks off actions in
888 * those layers so we couldn't enable it right away.)
889 */
890 spin_lock_irq(&card->irq_lock);
891 rsxx_enable_ier_and_isr(card, CR_INTR_EVENT);
892 spin_unlock_irq(&card->irq_lock);
893
894 if (card->state == CARD_STATE_SHUTDOWN) {
895 st = rsxx_issue_card_cmd(card, CARD_CMD_STARTUP);
896 if (st)
897 dev_crit(CARD_TO_DEV(card),
898 "Failed issuing card startup\n");
899 if (sync_start) {
900 sync_timeout = SYNC_START_TIMEOUT;
901
902 dev_info(CARD_TO_DEV(card),
903 "Waiting for card to startup\n");
904
905 do {
906 ssleep(1);
907 sync_timeout--;
908
909 rsxx_get_card_state(card, &card->state);
910 } while (sync_timeout &&
911 (card->state == CARD_STATE_STARTING));
912
913 if (card->state == CARD_STATE_STARTING) {
914 dev_warn(CARD_TO_DEV(card),
915 "Card startup timed out\n");
916 card->size8 = 0;
917 } else {
918 dev_info(CARD_TO_DEV(card),
919 "card state: %s\n",
920 rsxx_card_state_to_str(card->state));
921 st = rsxx_get_card_size8(card, &card->size8);
922 if (st)
923 card->size8 = 0;
924 }
925 }
926 } else if (card->state == CARD_STATE_GOOD ||
927 card->state == CARD_STATE_RD_ONLY_FAULT) {
928 st = rsxx_get_card_size8(card, &card->size8);
929 if (st)
930 card->size8 = 0;
931 }
932
933 rsxx_attach_dev(card);
934
935 /************* Setup Debugfs *************/
936 rsxx_debugfs_dev_new(card);
937
938 return 0;
939
940 failed_create_dev:
941 destroy_workqueue(card->event_wq);
942 card->event_wq = NULL;
943 failed_event_handler:
944 rsxx_dma_destroy(card);
945 failed_dma_setup:
946 failed_compatiblity_check:
947 destroy_workqueue(card->creg_ctrl.creg_wq);
948 card->creg_ctrl.creg_wq = NULL;
949 failed_creg_setup:
950 spin_lock_irq(&card->irq_lock);
951 rsxx_disable_ier_and_isr(card, CR_INTR_ALL);
952 spin_unlock_irq(&card->irq_lock);
953 free_irq(dev->irq, card);
954 if (!force_legacy)
955 pci_disable_msi(dev);
956 failed_irq:
957 pci_iounmap(dev, card->regmap);
958 failed_iomap:
959 pci_release_regions(dev);
960 failed_request_regions:
961 failed_dma_mask:
962 pci_disable_device(dev);
963 failed_enable:
964 ida_free(&rsxx_disk_ida, card->disk_id);
965 failed_ida_get:
966 kfree(card);
967
968 return st;
969 }
970
971 static void rsxx_pci_remove(struct pci_dev *dev)
972 {
973 struct rsxx_cardinfo *card = pci_get_drvdata(dev);
974 unsigned long flags;
975 int st;
976 int i;
977
978 if (!card)
979 return;
980
981 dev_info(CARD_TO_DEV(card),
982 "Removing PCI-Flash SSD.\n");
983
984 rsxx_detach_dev(card);
985
986 for (i = 0; i < card->n_targets; i++) {
987 spin_lock_irqsave(&card->irq_lock, flags);
988 rsxx_disable_ier_and_isr(card, CR_INTR_DMA(i));
989 spin_unlock_irqrestore(&card->irq_lock, flags);
990 }
991
992 st = card_shutdown(card);
993 if (st)
994 dev_crit(CARD_TO_DEV(card), "Shutdown failed!\n");
995
996 /* Sync outstanding event handlers. */
997 spin_lock_irqsave(&card->irq_lock, flags);
998 rsxx_disable_ier_and_isr(card, CR_INTR_EVENT);
999 spin_unlock_irqrestore(&card->irq_lock, flags);
1000
1001 cancel_work_sync(&card->event_work);
1002
1003 destroy_workqueue(card->event_wq);
1004 rsxx_destroy_dev(card);
1005 rsxx_dma_destroy(card);
1006 destroy_workqueue(card->creg_ctrl.creg_wq);
1007
1008 spin_lock_irqsave(&card->irq_lock, flags);
1009 rsxx_disable_ier_and_isr(card, CR_INTR_ALL);
1010 spin_unlock_irqrestore(&card->irq_lock, flags);
1011
1012 /* Prevent work_structs from re-queuing themselves. */
1013 card->halt = 1;
1014
1015 debugfs_remove_recursive(card->debugfs_dir);
1016
1017 free_irq(dev->irq, card);
1018
1019 if (!force_legacy)
1020 pci_disable_msi(dev);
1021
1022 rsxx_creg_destroy(card);
1023
1024 pci_iounmap(dev, card->regmap);
1025
1026 pci_disable_device(dev);
1027 pci_release_regions(dev);
1028
1029 ida_free(&rsxx_disk_ida, card->disk_id);
1030 kfree(card);
1031 }
1032
1033 static int rsxx_pci_suspend(struct pci_dev *dev, pm_message_t state)
1034 {
1035 /* We don't support suspend at this time. */
1036 return -ENOSYS;
1037 }
1038
1039 static void rsxx_pci_shutdown(struct pci_dev *dev)
1040 {
1041 struct rsxx_cardinfo *card = pci_get_drvdata(dev);
1042 unsigned long flags;
1043 int i;
1044
1045 if (!card)
1046 return;
1047
1048 dev_info(CARD_TO_DEV(card), "Shutting down PCI-Flash SSD.\n");
1049
1050 rsxx_detach_dev(card);
1051
1052 for (i = 0; i < card->n_targets; i++) {
1053 spin_lock_irqsave(&card->irq_lock, flags);
1054 rsxx_disable_ier_and_isr(card, CR_INTR_DMA(i));
1055 spin_unlock_irqrestore(&card->irq_lock, flags);
1056 }
1057
1058 card_shutdown(card);
1059 }
1060
1061 static const struct pci_error_handlers rsxx_err_handler = {
1062 .error_detected = rsxx_error_detected,
1063 .slot_reset = rsxx_slot_reset,
1064 };
1065
1066 static const struct pci_device_id rsxx_pci_ids[] = {
1067 {PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_FS70_FLASH)},
1068 {PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_FS80_FLASH)},
1069 {0,},
1070 };
1071
1072 MODULE_DEVICE_TABLE(pci, rsxx_pci_ids);
1073
1074 static struct pci_driver rsxx_pci_driver = {
1075 .name = DRIVER_NAME,
1076 .id_table = rsxx_pci_ids,
1077 .probe = rsxx_pci_probe,
1078 .remove = rsxx_pci_remove,
1079 .suspend = rsxx_pci_suspend,
1080 .shutdown = rsxx_pci_shutdown,
1081 .err_handler = &rsxx_err_handler,
1082 };
1083
1084 static int __init rsxx_core_init(void)
1085 {
1086 int st;
1087
1088 st = rsxx_dev_init();
1089 if (st)
1090 return st;
1091
1092 st = rsxx_dma_init();
1093 if (st)
1094 goto dma_init_failed;
1095
1096 st = rsxx_creg_init();
1097 if (st)
1098 goto creg_init_failed;
1099
1100 return pci_register_driver(&rsxx_pci_driver);
1101
1102 creg_init_failed:
1103 rsxx_dma_cleanup();
1104 dma_init_failed:
1105 rsxx_dev_cleanup();
1106
1107 return st;
1108 }
1109
1110 static void __exit rsxx_core_cleanup(void)
1111 {
1112 pci_unregister_driver(&rsxx_pci_driver);
1113 rsxx_creg_cleanup();
1114 rsxx_dma_cleanup();
1115 rsxx_dev_cleanup();
1116 }
1117
1118 module_init(rsxx_core_init);
1119 module_exit(rsxx_core_cleanup);
Linux with added FPC-III support