drivers/block/rsxx/core.c

   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);