drivers/block/rsxx/core.c

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