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         int 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                 if (copy_to_user(ubuf, buf, cnt))
 192                         st = -EFAULT;
 193         }
 194         kfree(buf);
 195         if (st)
 196                 return st;
 197         *ppos += cnt;
 198         return cnt;
 199 }
 200
 201 static ssize_t rsxx_cram_write(struct file *fp, const char __user *ubuf,
 202                                size_t cnt, loff_t *ppos)
 203 {
 204         struct rsxx_cardinfo *card = file_inode(fp)->i_private;
 205         char *buf;
 206         ssize_t st;
 207
 208         buf = kzalloc(cnt, GFP_KERNEL);
 209         if (!buf)
 210                 return -ENOMEM;
 211
 212         st = copy_from_user(buf, ubuf, cnt);
 213         if (!st)
 214                 st = rsxx_creg_write(card, CREG_ADD_CRAM + (u32)*ppos, cnt,
 215                                      buf, 1);
 216         kfree(buf);
 217         if (st)
 218                 return st;
 219         *ppos += cnt;
 220         return cnt;
 221 }
 222
 223 static const struct file_operations debugfs_cram_fops = {
 224         .owner          = THIS_MODULE,
 225         .read           = rsxx_cram_read,
 226         .write          = rsxx_cram_write,
 227 };
 228
 229 static const struct file_operations debugfs_stats_fops = {
 230         .owner          = THIS_MODULE,
 231         .open           = rsxx_attr_stats_open,
 232         .read           = seq_read,
 233         .llseek         = seq_lseek,
 234         .release        = single_release,
 235 };
 236
 237 static const struct file_operations debugfs_pci_regs_fops = {
 238         .owner          = THIS_MODULE,
 239         .open           = rsxx_attr_pci_regs_open,
 240         .read           = seq_read,
 241         .llseek         = seq_lseek,
 242         .release        = single_release,
 243 };
 244
 245 static void rsxx_debugfs_dev_new(struct rsxx_cardinfo *card)
 246 {
 247         struct dentry *debugfs_stats;
 248         struct dentry *debugfs_pci_regs;
 249         struct dentry *debugfs_cram;
 250
 251         card->debugfs_dir = debugfs_create_dir(card->gendisk->disk_name, NULL);
 252         if (IS_ERR_OR_NULL(card->debugfs_dir))
 253                 goto failed_debugfs_dir;
 254
 255         debugfs_stats = debugfs_create_file("stats", S_IRUGO,
 256                                             card->debugfs_dir, card,
 257                                             &debugfs_stats_fops);
 258         if (IS_ERR_OR_NULL(debugfs_stats))
 259                 goto failed_debugfs_stats;
 260
 261         debugfs_pci_regs = debugfs_create_file("pci_regs", S_IRUGO,
 262                                                card->debugfs_dir, card,
 263                                                &debugfs_pci_regs_fops);
 264         if (IS_ERR_OR_NULL(debugfs_pci_regs))
 265                 goto failed_debugfs_pci_regs;
 266
 267         debugfs_cram = debugfs_create_file("cram", S_IRUGO | S_IWUSR,
 268                                            card->debugfs_dir, card,
 269                                            &debugfs_cram_fops);
 270         if (IS_ERR_OR_NULL(debugfs_cram))
 271                 goto failed_debugfs_cram;
 272
 273         return;
 274 failed_debugfs_cram:
 275         debugfs_remove(debugfs_pci_regs);
 276 failed_debugfs_pci_regs:
 277         debugfs_remove(debugfs_stats);
 278 failed_debugfs_stats:
 279         debugfs_remove(card->debugfs_dir);
 280 failed_debugfs_dir:
 281         card->debugfs_dir = NULL;
 282 }
 283
 284 /*----------------- Interrupt Control & Handling -------------------*/
 285
 286 static void rsxx_mask_interrupts(struct rsxx_cardinfo *card)
 287 {
 288         card->isr_mask = 0;
 289         card->ier_mask = 0;
 290 }
 291
 292 static void __enable_intr(unsigned int *mask, unsigned int intr)
 293 {
 294         *mask |= intr;
 295 }
 296
 297 static void __disable_intr(unsigned int *mask, unsigned int intr)
 298 {
 299         *mask &= ~intr;
 300 }
 301
 302 /*
 303  * NOTE: Disabling the IER will disable the hardware interrupt.
 304  * Disabling the ISR will disable the software handling of the ISR bit.
 305  *
 306  * Enable/Disable interrupt functions assume the card->irq_lock
 307  * is held by the caller.
 308  */
 309 void rsxx_enable_ier(struct rsxx_cardinfo *card, unsigned int intr)
 310 {
 311         if (unlikely(card->halt) ||
 312             unlikely(card->eeh_state))
 313                 return;
 314
 315         __enable_intr(&card->ier_mask, intr);
 316         iowrite32(card->ier_mask, card->regmap + IER);
 317 }
 318
 319 void rsxx_disable_ier(struct rsxx_cardinfo *card, unsigned int intr)
 320 {
 321         if (unlikely(card->eeh_state))
 322                 return;
 323
 324         __disable_intr(&card->ier_mask, intr);
 325         iowrite32(card->ier_mask, card->regmap + IER);
 326 }
 327
 328 void rsxx_enable_ier_and_isr(struct rsxx_cardinfo *card,
 329                                  unsigned int intr)
 330 {
 331         if (unlikely(card->halt) ||
 332             unlikely(card->eeh_state))
 333                 return;
 334
 335         __enable_intr(&card->isr_mask, intr);
 336         __enable_intr(&card->ier_mask, intr);
 337         iowrite32(card->ier_mask, card->regmap + IER);
 338 }
 339 void rsxx_disable_ier_and_isr(struct rsxx_cardinfo *card,
 340                                   unsigned int intr)
 341 {
 342         if (unlikely(card->eeh_state))
 343                 return;
 344
 345         __disable_intr(&card->isr_mask, intr);
 346         __disable_intr(&card->ier_mask, intr);
 347         iowrite32(card->ier_mask, card->regmap + IER);
 348 }
 349
 350 static irqreturn_t rsxx_isr(int irq, void *pdata)
 351 {
 352         struct rsxx_cardinfo *card = pdata;
 353         unsigned int isr;
 354         int handled = 0;
 355         int reread_isr;
 356         int i;
 357
 358         spin_lock(&card->irq_lock);
 359
 360         do {
 361                 reread_isr = 0;
 362
 363                 if (unlikely(card->eeh_state))
 364                         break;
 365
 366                 isr = ioread32(card->regmap + ISR);
 367                 if (isr == 0xffffffff) {
 368                         /*
 369                          * A few systems seem to have an intermittent issue
 370                          * where PCI reads return all Fs, but retrying the read
 371                          * a little later will return as expected.
 372                          */
 373                         dev_info(CARD_TO_DEV(card),
 374                                 "ISR = 0xFFFFFFFF, retrying later\n");
 375                         break;
 376                 }
 377
 378                 isr &= card->isr_mask;
 379                 if (!isr)
 380                         break;
 381
 382                 for (i = 0; i < card->n_targets; i++) {
 383                         if (isr & CR_INTR_DMA(i)) {
 384                                 if (card->ier_mask & CR_INTR_DMA(i)) {
 385                                         rsxx_disable_ier(card, CR_INTR_DMA(i));
 386                                         reread_isr = 1;
 387                                 }
 388                                 queue_work(card->ctrl[i].done_wq,
 389                                            &card->ctrl[i].dma_done_work);
 390                                 handled++;
 391                         }
 392                 }
 393
 394                 if (isr & CR_INTR_CREG) {
 395                         queue_work(card->creg_ctrl.creg_wq,
 396                                    &card->creg_ctrl.done_work);
 397                         handled++;
 398                 }
 399
 400                 if (isr & CR_INTR_EVENT) {
 401                         queue_work(card->event_wq, &card->event_work);
 402                         rsxx_disable_ier_and_isr(card, CR_INTR_EVENT);
 403                         handled++;
 404                 }
 405         } while (reread_isr);
 406
 407         spin_unlock(&card->irq_lock);
 408
 409         return handled ? IRQ_HANDLED : IRQ_NONE;
 410 }
 411
 412 /*----------------- Card Event Handler -------------------*/
 413 static const char * const rsxx_card_state_to_str(unsigned int state)
 414 {
 415         static const char * const state_strings[] = {
 416                 "Unknown", "Shutdown", "Starting", "Formatting",
 417                 "Uninitialized", "Good", "Shutting Down",
 418                 "Fault", "Read Only Fault", "dStroying"
 419         };
 420
 421         return state_strings[ffs(state)];
 422 }
 423
 424 static void card_state_change(struct rsxx_cardinfo *card,
 425                               unsigned int new_state)
 426 {
 427         int st;
 428
 429         dev_info(CARD_TO_DEV(card),
 430                 "card state change detected.(%s -> %s)\n",
 431                 rsxx_card_state_to_str(card->state),
 432                 rsxx_card_state_to_str(new_state));
 433
 434         card->state = new_state;
 435
 436         /* Don't attach DMA interfaces if the card has an invalid config */
 437         if (!card->config_valid)
 438                 return;
 439
 440         switch (new_state) {
 441         case CARD_STATE_RD_ONLY_FAULT:
 442                 dev_crit(CARD_TO_DEV(card),
 443                         "Hardware has entered read-only mode!\n");
 444                 /*
 445                  * Fall through so the DMA devices can be attached and
 446                  * the user can attempt to pull off their data.
 447                  */
 448         case CARD_STATE_GOOD:
 449                 st = rsxx_get_card_size8(card, &card->size8);
 450                 if (st)
 451                         dev_err(CARD_TO_DEV(card),
 452                                 "Failed attaching DMA devices\n");
 453
 454                 if (card->config_valid)
 455                         set_capacity(card->gendisk, card->size8 >> 9);
 456                 break;
 457
 458         case CARD_STATE_FAULT:
 459                 dev_crit(CARD_TO_DEV(card),
 460                         "Hardware Fault reported!\n");
 461                 /* Fall through. */
 462
 463         /* Everything else, detach DMA interface if it's attached. */
 464         case CARD_STATE_SHUTDOWN:
 465         case CARD_STATE_STARTING:
 466         case CARD_STATE_FORMATTING:
 467         case CARD_STATE_UNINITIALIZED:
 468         case CARD_STATE_SHUTTING_DOWN:
 469         /*
 470          * dStroy is a term coined by marketing to represent the low level
 471          * secure erase.
 472          */
 473         case CARD_STATE_DSTROYING:
 474                 set_capacity(card->gendisk, 0);
 475                 break;
 476         }
 477 }
 478
 479 static void card_event_handler(struct work_struct *work)
 480 {
 481         struct rsxx_cardinfo *card;
 482         unsigned int state;
 483         unsigned long flags;
 484         int st;
 485
 486         card = container_of(work, struct rsxx_cardinfo, event_work);
 487
 488         if (unlikely(card->halt))
 489                 return;
 490
 491         /*
 492          * Enable the interrupt now to avoid any weird race conditions where a
 493          * state change might occur while rsxx_get_card_state() is
 494          * processing a returned creg cmd.
 495          */
 496         spin_lock_irqsave(&card->irq_lock, flags);
 497         rsxx_enable_ier_and_isr(card, CR_INTR_EVENT);
 498         spin_unlock_irqrestore(&card->irq_lock, flags);
 499
 500         st = rsxx_get_card_state(card, &state);
 501         if (st) {
 502                 dev_info(CARD_TO_DEV(card),
 503                         "Failed reading state after event.\n");
 504                 return;
 505         }
 506
 507         if (card->state != state)
 508                 card_state_change(card, state);
 509
 510         if (card->creg_ctrl.creg_stats.stat & CREG_STAT_LOG_PENDING)
 511                 rsxx_read_hw_log(card);
 512 }
 513
 514 /*----------------- Card Operations -------------------*/
 515 static int card_shutdown(struct rsxx_cardinfo *card)
 516 {
 517         unsigned int state;
 518         signed long start;
 519         const int timeout = msecs_to_jiffies(120000);
 520         int st;
 521
 522         /* We can't issue a shutdown if the card is in a transition state */
 523         start = jiffies;
 524         do {
 525                 st = rsxx_get_card_state(card, &state);
 526                 if (st)
 527                         return st;
 528         } while (state == CARD_STATE_STARTING &&
 529                  (jiffies - start < timeout));
 530
 531         if (state == CARD_STATE_STARTING)
 532                 return -ETIMEDOUT;
 533
 534         /* Only issue a shutdown if we need to */
 535         if ((state != CARD_STATE_SHUTTING_DOWN) &&
 536             (state != CARD_STATE_SHUTDOWN)) {
 537                 st = rsxx_issue_card_cmd(card, CARD_CMD_SHUTDOWN);
 538                 if (st)
 539                         return st;
 540         }
 541
 542         start = jiffies;
 543         do {
 544                 st = rsxx_get_card_state(card, &state);
 545                 if (st)
 546                         return st;
 547         } while (state != CARD_STATE_SHUTDOWN &&
 548                  (jiffies - start < timeout));
 549
 550         if (state != CARD_STATE_SHUTDOWN)
 551                 return -ETIMEDOUT;
 552
 553         return 0;
 554 }
 555
 556 static int rsxx_eeh_frozen(struct pci_dev *dev)
 557 {
 558         struct rsxx_cardinfo *card = pci_get_drvdata(dev);
 559         int i;
 560         int st;
 561
 562         dev_warn(&dev->dev, "IBM Flash Adapter PCI: preparing for slot reset.\n");
 563
 564         card->eeh_state = 1;
 565         rsxx_mask_interrupts(card);
 566
 567         /*
 568          * We need to guarantee that the write for eeh_state and masking
 569          * interrupts does not become reordered. This will prevent a possible
 570          * race condition with the EEH code.
 571          */
 572         wmb();
 573
 574         pci_disable_device(dev);
 575
 576         st = rsxx_eeh_save_issued_dmas(card);
 577         if (st)
 578                 return st;
 579
 580         rsxx_eeh_save_issued_creg(card);
 581
 582         for (i = 0; i < card->n_targets; i++) {
 583                 if (card->ctrl[i].status.buf)
 584                         pci_free_consistent(card->dev, STATUS_BUFFER_SIZE8,
 585                                             card->ctrl[i].status.buf,
 586                                             card->ctrl[i].status.dma_addr);
 587                 if (card->ctrl[i].cmd.buf)
 588                         pci_free_consistent(card->dev, COMMAND_BUFFER_SIZE8,
 589                                             card->ctrl[i].cmd.buf,
 590                                             card->ctrl[i].cmd.dma_addr);
 591         }
 592
 593         return 0;
 594 }
 595
 596 static void rsxx_eeh_failure(struct pci_dev *dev)
 597 {
 598         struct rsxx_cardinfo *card = pci_get_drvdata(dev);
 599         int i;
 600         int cnt = 0;
 601
 602         dev_err(&dev->dev, "IBM Flash Adapter PCI: disabling failed card.\n");
 603
 604         card->eeh_state = 1;
 605         card->halt = 1;
 606
 607         for (i = 0; i < card->n_targets; i++) {
 608                 spin_lock_bh(&card->ctrl[i].queue_lock);
 609                 cnt = rsxx_cleanup_dma_queue(&card->ctrl[i],
 610                                              &card->ctrl[i].queue,
 611                                              COMPLETE_DMA);
 612                 spin_unlock_bh(&card->ctrl[i].queue_lock);
 613
 614                 cnt += rsxx_dma_cancel(&card->ctrl[i]);
 615
 616                 if (cnt)
 617                         dev_info(CARD_TO_DEV(card),
 618                                 "Freed %d queued DMAs on channel %d\n",
 619                                 cnt, card->ctrl[i].id);
 620         }
 621 }
 622
 623 static int rsxx_eeh_fifo_flush_poll(struct rsxx_cardinfo *card)
 624 {
 625         unsigned int status;
 626         int iter = 0;
 627
 628         /* We need to wait for the hardware to reset */
 629         while (iter++ < 10) {
 630                 status = ioread32(card->regmap + PCI_RECONFIG);
 631
 632                 if (status & RSXX_FLUSH_BUSY) {
 633                         ssleep(1);
 634                         continue;
 635                 }
 636
 637                 if (status & RSXX_FLUSH_TIMEOUT)
 638                         dev_warn(CARD_TO_DEV(card), "HW: flash controller timeout\n");
 639                 return 0;
 640         }
 641
 642         /* Hardware failed resetting itself. */
 643         return -1;
 644 }
 645
 646 static pci_ers_result_t rsxx_error_detected(struct pci_dev *dev,
 647                                             enum pci_channel_state error)
 648 {
 649         int st;
 650
 651         if (dev->revision < RSXX_EEH_SUPPORT)
 652                 return PCI_ERS_RESULT_NONE;
 653
 654         if (error == pci_channel_io_perm_failure) {
 655                 rsxx_eeh_failure(dev);
 656                 return PCI_ERS_RESULT_DISCONNECT;
 657         }
 658
 659         st = rsxx_eeh_frozen(dev);
 660         if (st) {
 661                 dev_err(&dev->dev, "Slot reset setup failed\n");
 662                 rsxx_eeh_failure(dev);
 663                 return PCI_ERS_RESULT_DISCONNECT;
 664         }
 665
 666         return PCI_ERS_RESULT_NEED_RESET;
 667 }
 668
 669 static pci_ers_result_t rsxx_slot_reset(struct pci_dev *dev)
 670 {
 671         struct rsxx_cardinfo *card = pci_get_drvdata(dev);
 672         unsigned long flags;
 673         int i;
 674         int st;
 675
 676         dev_warn(&dev->dev,
 677                 "IBM Flash Adapter PCI: recovering from slot reset.\n");
 678
 679         st = pci_enable_device(dev);
 680         if (st)
 681                 goto failed_hw_setup;
 682
 683         pci_set_master(dev);
 684
 685         st = rsxx_eeh_fifo_flush_poll(card);
 686         if (st)
 687                 goto failed_hw_setup;
 688
 689         rsxx_dma_queue_reset(card);
 690
 691         for (i = 0; i < card->n_targets; i++) {
 692                 st = rsxx_hw_buffers_init(dev, &card->ctrl[i]);
 693                 if (st)
 694                         goto failed_hw_buffers_init;
 695         }
 696
 697         if (card->config_valid)
 698                 rsxx_dma_configure(card);
 699
 700         /* Clears the ISR register from spurious interrupts */
 701         st = ioread32(card->regmap + ISR);
 702
 703         card->eeh_state = 0;
 704
 705         spin_lock_irqsave(&card->irq_lock, flags);
 706         if (card->n_targets & RSXX_MAX_TARGETS)
 707                 rsxx_enable_ier_and_isr(card, CR_INTR_ALL_G);
 708         else
 709                 rsxx_enable_ier_and_isr(card, CR_INTR_ALL_C);
 710         spin_unlock_irqrestore(&card->irq_lock, flags);
 711
 712         rsxx_kick_creg_queue(card);
 713
 714         for (i = 0; i < card->n_targets; i++) {
 715                 spin_lock(&card->ctrl[i].queue_lock);
 716                 if (list_empty(&card->ctrl[i].queue)) {
 717                         spin_unlock(&card->ctrl[i].queue_lock);
 718                         continue;
 719                 }
 720                 spin_unlock(&card->ctrl[i].queue_lock);
 721
 722                 queue_work(card->ctrl[i].issue_wq,
 723                                 &card->ctrl[i].issue_dma_work);
 724         }
 725
 726         dev_info(&dev->dev, "IBM Flash Adapter PCI: recovery complete.\n");
 727
 728         return PCI_ERS_RESULT_RECOVERED;
 729
 730 failed_hw_buffers_init:
 731         for (i = 0; i < card->n_targets; i++) {
 732                 if (card->ctrl[i].status.buf)
 733                         pci_free_consistent(card->dev,
 734                                         STATUS_BUFFER_SIZE8,
 735                                         card->ctrl[i].status.buf,
 736                                         card->ctrl[i].status.dma_addr);
 737                 if (card->ctrl[i].cmd.buf)
 738                         pci_free_consistent(card->dev,
 739                                         COMMAND_BUFFER_SIZE8,
 740                                         card->ctrl[i].cmd.buf,
 741                                         card->ctrl[i].cmd.dma_addr);
 742         }
 743 failed_hw_setup:
 744         rsxx_eeh_failure(dev);
 745         return PCI_ERS_RESULT_DISCONNECT;
 746
 747 }
 748
 749 /*----------------- Driver Initialization & Setup -------------------*/
 750 /* Returns:   0 if the driver is compatible with the device
 751              -1 if the driver is NOT compatible with the device */
 752 static int rsxx_compatibility_check(struct rsxx_cardinfo *card)
 753 {
 754         unsigned char pci_rev;
 755
 756         pci_read_config_byte(card->dev, PCI_REVISION_ID, &pci_rev);
 757
 758         if (pci_rev > RS70_PCI_REV_SUPPORTED)
 759                 return -1;
 760         return 0;
 761 }
 762
 763 static int rsxx_pci_probe(struct pci_dev *dev,
 764                                         const struct pci_device_id *id)
 765 {
 766         struct rsxx_cardinfo *card;
 767         int st;
 768         unsigned int sync_timeout;
 769
 770         dev_info(&dev->dev, "PCI-Flash SSD discovered\n");
 771
 772         card = kzalloc(sizeof(*card), GFP_KERNEL);
 773         if (!card)
 774                 return -ENOMEM;
 775
 776         card->dev = dev;
 777         pci_set_drvdata(dev, card);
 778
 779         do {
 780                 if (!ida_pre_get(&rsxx_disk_ida, GFP_KERNEL)) {
 781                         st = -ENOMEM;
 782                         goto failed_ida_get;
 783                 }
 784
 785                 spin_lock(&rsxx_ida_lock);
 786                 st = ida_get_new(&rsxx_disk_ida, &card->disk_id);
 787                 spin_unlock(&rsxx_ida_lock);
 788         } while (st == -EAGAIN);
 789
 790         if (st)
 791                 goto failed_ida_get;
 792
 793         st = pci_enable_device(dev);
 794         if (st)
 795                 goto failed_enable;
 796
 797         pci_set_master(dev);
 798         pci_set_dma_max_seg_size(dev, RSXX_HW_BLK_SIZE);
 799
 800         st = pci_set_dma_mask(dev, DMA_BIT_MASK(64));
 801         if (st) {
 802                 dev_err(CARD_TO_DEV(card),
 803                         "No usable DMA configuration,aborting\n");
 804                 goto failed_dma_mask;
 805         }
 806
 807         st = pci_request_regions(dev, DRIVER_NAME);
 808         if (st) {
 809                 dev_err(CARD_TO_DEV(card),
 810                         "Failed to request memory region\n");
 811                 goto failed_request_regions;
 812         }
 813
 814         if (pci_resource_len(dev, 0) == 0) {
 815                 dev_err(CARD_TO_DEV(card), "BAR0 has length 0!\n");
 816                 st = -ENOMEM;
 817                 goto failed_iomap;
 818         }
 819
 820         card->regmap = pci_iomap(dev, 0, 0);
 821         if (!card->regmap) {
 822                 dev_err(CARD_TO_DEV(card), "Failed to map BAR0\n");
 823                 st = -ENOMEM;
 824                 goto failed_iomap;
 825         }
 826
 827         spin_lock_init(&card->irq_lock);
 828         card->halt = 0;
 829         card->eeh_state = 0;
 830
 831         spin_lock_irq(&card->irq_lock);
 832         rsxx_disable_ier_and_isr(card, CR_INTR_ALL);
 833         spin_unlock_irq(&card->irq_lock);
 834
 835         if (!force_legacy) {
 836                 st = pci_enable_msi(dev);
 837                 if (st)
 838                         dev_warn(CARD_TO_DEV(card),
 839                                 "Failed to enable MSI\n");
 840         }
 841
 842         st = request_irq(dev->irq, rsxx_isr, IRQF_SHARED,
 843                          DRIVER_NAME, card);
 844         if (st) {
 845                 dev_err(CARD_TO_DEV(card),
 846                         "Failed requesting IRQ%d\n", dev->irq);
 847                 goto failed_irq;
 848         }
 849
 850         /************* Setup Processor Command Interface *************/
 851         st = rsxx_creg_setup(card);
 852         if (st) {
 853                 dev_err(CARD_TO_DEV(card), "Failed to setup creg interface.\n");
 854                 goto failed_creg_setup;
 855         }
 856
 857         spin_lock_irq(&card->irq_lock);
 858         rsxx_enable_ier_and_isr(card, CR_INTR_CREG);
 859         spin_unlock_irq(&card->irq_lock);
 860
 861         st = rsxx_compatibility_check(card);
 862         if (st) {
 863                 dev_warn(CARD_TO_DEV(card),
 864                         "Incompatible driver detected. Please update the driver.\n");
 865                 st = -EINVAL;
 866                 goto failed_compatiblity_check;
 867         }
 868
 869         /************* Load Card Config *************/
 870         st = rsxx_load_config(card);
 871         if (st)
 872                 dev_err(CARD_TO_DEV(card),
 873                         "Failed loading card config\n");
 874
 875         /************* Setup DMA Engine *************/
 876         st = rsxx_get_num_targets(card, &card->n_targets);
 877         if (st)
 878                 dev_info(CARD_TO_DEV(card),
 879                         "Failed reading the number of DMA targets\n");
 880
 881         card->ctrl = kzalloc(card->n_targets * sizeof(*card->ctrl), GFP_KERNEL);
 882         if (!card->ctrl) {
 883                 st = -ENOMEM;
 884                 goto failed_dma_setup;
 885         }
 886
 887         st = rsxx_dma_setup(card);
 888         if (st) {
 889                 dev_info(CARD_TO_DEV(card),
 890                         "Failed to setup DMA engine\n");
 891                 goto failed_dma_setup;
 892         }
 893
 894         /************* Setup Card Event Handler *************/
 895         card->event_wq = create_singlethread_workqueue(DRIVER_NAME"_event");
 896         if (!card->event_wq) {
 897                 dev_err(CARD_TO_DEV(card), "Failed card event setup.\n");
 898                 st = -ENOMEM;
 899                 goto failed_event_handler;
 900         }
 901
 902         INIT_WORK(&card->event_work, card_event_handler);
 903
 904         st = rsxx_setup_dev(card);
 905         if (st)
 906                 goto failed_create_dev;
 907
 908         rsxx_get_card_state(card, &card->state);
 909
 910         dev_info(CARD_TO_DEV(card),
 911                 "card state: %s\n",
 912                 rsxx_card_state_to_str(card->state));
 913
 914         /*
 915          * Now that the DMA Engine and devices have been setup,
 916          * we can enable the event interrupt(it kicks off actions in
 917          * those layers so we couldn't enable it right away.)
 918          */
 919         spin_lock_irq(&card->irq_lock);
 920         rsxx_enable_ier_and_isr(card, CR_INTR_EVENT);
 921         spin_unlock_irq(&card->irq_lock);
 922
 923         if (card->state == CARD_STATE_SHUTDOWN) {
 924                 st = rsxx_issue_card_cmd(card, CARD_CMD_STARTUP);
 925                 if (st)
 926                         dev_crit(CARD_TO_DEV(card),
 927                                 "Failed issuing card startup\n");
 928                 if (sync_start) {
 929                         sync_timeout = SYNC_START_TIMEOUT;
 930
 931                         dev_info(CARD_TO_DEV(card),
 932                                  "Waiting for card to startup\n");
 933
 934                         do {
 935                                 ssleep(1);
 936                                 sync_timeout--;
 937
 938                                 rsxx_get_card_state(card, &card->state);
 939                         } while (sync_timeout &&
 940                                 (card->state == CARD_STATE_STARTING));
 941
 942                         if (card->state == CARD_STATE_STARTING) {
 943                                 dev_warn(CARD_TO_DEV(card),
 944                                          "Card startup timed out\n");
 945                                 card->size8 = 0;
 946                         } else {
 947                                 dev_info(CARD_TO_DEV(card),
 948                                         "card state: %s\n",
 949                                         rsxx_card_state_to_str(card->state));
 950                                 st = rsxx_get_card_size8(card, &card->size8);
 951                                 if (st)
 952                                         card->size8 = 0;
 953                         }
 954                 }
 955         } else if (card->state == CARD_STATE_GOOD ||
 956                    card->state == CARD_STATE_RD_ONLY_FAULT) {
 957                 st = rsxx_get_card_size8(card, &card->size8);
 958                 if (st)
 959                         card->size8 = 0;
 960         }
 961
 962         rsxx_attach_dev(card);
 963
 964         /************* Setup Debugfs *************/
 965         rsxx_debugfs_dev_new(card);
 966
 967         return 0;
 968
 969 failed_create_dev:
 970         destroy_workqueue(card->event_wq);
 971         card->event_wq = NULL;
 972 failed_event_handler:
 973         rsxx_dma_destroy(card);
 974 failed_dma_setup:
 975 failed_compatiblity_check:
 976         destroy_workqueue(card->creg_ctrl.creg_wq);
 977         card->creg_ctrl.creg_wq = NULL;
 978 failed_creg_setup:
 979         spin_lock_irq(&card->irq_lock);
 980         rsxx_disable_ier_and_isr(card, CR_INTR_ALL);
 981         spin_unlock_irq(&card->irq_lock);
 982         free_irq(dev->irq, card);
 983         if (!force_legacy)
 984                 pci_disable_msi(dev);
 985 failed_irq:
 986         pci_iounmap(dev, card->regmap);
 987 failed_iomap:
 988         pci_release_regions(dev);
 989 failed_request_regions:
 990 failed_dma_mask:
 991         pci_disable_device(dev);
 992 failed_enable:
 993         spin_lock(&rsxx_ida_lock);
 994         ida_remove(&rsxx_disk_ida, card->disk_id);
 995         spin_unlock(&rsxx_ida_lock);
 996 failed_ida_get:
 997         kfree(card);
 998
 999         return st;
1000 }
1001
1002 static void rsxx_pci_remove(struct pci_dev *dev)
1003 {
1004         struct rsxx_cardinfo *card = pci_get_drvdata(dev);
1005         unsigned long flags;
1006         int st;
1007         int i;
1008
1009         if (!card)
1010                 return;
1011
1012         dev_info(CARD_TO_DEV(card),
1013                 "Removing PCI-Flash SSD.\n");
1014
1015         rsxx_detach_dev(card);
1016
1017         for (i = 0; i < card->n_targets; i++) {
1018                 spin_lock_irqsave(&card->irq_lock, flags);
1019                 rsxx_disable_ier_and_isr(card, CR_INTR_DMA(i));
1020                 spin_unlock_irqrestore(&card->irq_lock, flags);
1021         }
1022
1023         st = card_shutdown(card);
1024         if (st)
1025                 dev_crit(CARD_TO_DEV(card), "Shutdown failed!\n");
1026
1027         /* Sync outstanding event handlers. */
1028         spin_lock_irqsave(&card->irq_lock, flags);
1029         rsxx_disable_ier_and_isr(card, CR_INTR_EVENT);
1030         spin_unlock_irqrestore(&card->irq_lock, flags);
1031
1032         cancel_work_sync(&card->event_work);
1033
1034         destroy_workqueue(card->event_wq);
1035         rsxx_destroy_dev(card);
1036         rsxx_dma_destroy(card);
1037         destroy_workqueue(card->creg_ctrl.creg_wq);
1038
1039         spin_lock_irqsave(&card->irq_lock, flags);
1040         rsxx_disable_ier_and_isr(card, CR_INTR_ALL);
1041         spin_unlock_irqrestore(&card->irq_lock, flags);
1042
1043         /* Prevent work_structs from re-queuing themselves. */
1044         card->halt = 1;
1045
1046         debugfs_remove_recursive(card->debugfs_dir);
1047
1048         free_irq(dev->irq, card);
1049
1050         if (!force_legacy)
1051                 pci_disable_msi(dev);
1052
1053         rsxx_creg_destroy(card);
1054
1055         pci_iounmap(dev, card->regmap);
1056
1057         pci_disable_device(dev);
1058         pci_release_regions(dev);
1059
1060         kfree(card);
1061 }
1062
1063 static int rsxx_pci_suspend(struct pci_dev *dev, pm_message_t state)
1064 {
1065         /* We don't support suspend at this time. */
1066         return -ENOSYS;
1067 }
1068
1069 static void rsxx_pci_shutdown(struct pci_dev *dev)
1070 {
1071         struct rsxx_cardinfo *card = pci_get_drvdata(dev);
1072         unsigned long flags;
1073         int i;
1074
1075         if (!card)
1076                 return;
1077
1078         dev_info(CARD_TO_DEV(card), "Shutting down PCI-Flash SSD.\n");
1079
1080         rsxx_detach_dev(card);
1081
1082         for (i = 0; i < card->n_targets; i++) {
1083                 spin_lock_irqsave(&card->irq_lock, flags);
1084                 rsxx_disable_ier_and_isr(card, CR_INTR_DMA(i));
1085                 spin_unlock_irqrestore(&card->irq_lock, flags);
1086         }
1087
1088         card_shutdown(card);
1089 }
1090
1091 static const struct pci_error_handlers rsxx_err_handler = {
1092         .error_detected = rsxx_error_detected,
1093         .slot_reset     = rsxx_slot_reset,
1094 };
1095
1096 static const struct pci_device_id rsxx_pci_ids[] = {
1097         {PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_FS70_FLASH)},
1098         {PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_FS80_FLASH)},
1099         {0,},
1100 };
1101
1102 MODULE_DEVICE_TABLE(pci, rsxx_pci_ids);
1103
1104 static struct pci_driver rsxx_pci_driver = {
1105         .name           = DRIVER_NAME,
1106         .id_table       = rsxx_pci_ids,
1107         .probe          = rsxx_pci_probe,
1108         .remove         = rsxx_pci_remove,
1109         .suspend        = rsxx_pci_suspend,
1110         .shutdown       = rsxx_pci_shutdown,
1111         .err_handler    = &rsxx_err_handler,
1112 };
1113
1114 static int __init rsxx_core_init(void)
1115 {
1116         int st;
1117
1118         st = rsxx_dev_init();
1119         if (st)
1120                 return st;
1121
1122         st = rsxx_dma_init();
1123         if (st)
1124                 goto dma_init_failed;
1125
1126         st = rsxx_creg_init();
1127         if (st)
1128                 goto creg_init_failed;
1129
1130         return pci_register_driver(&rsxx_pci_driver);
1131
1132 creg_init_failed:
1133         rsxx_dma_cleanup();
1134 dma_init_failed:
1135         rsxx_dev_cleanup();
1136
1137         return st;
1138 }
1139
1140 static void __exit rsxx_core_cleanup(void)
1141 {
1142         pci_unregister_driver(&rsxx_pci_driver);
1143         rsxx_creg_cleanup();
1144         rsxx_dma_cleanup();
1145         rsxx_dev_cleanup();
1146 }
1147
1148 module_init(rsxx_core_init);
1149 module_exit(rsxx_core_cleanup);