git.oblomov.eu Git - linux-2.6/blob - drivers/scsi/megaraid/megaraid_sas.c

   1 /*
   2  *
   3  *              Linux MegaRAID driver for SAS based RAID controllers
   4  *
   5  * Copyright (c) 2003-2005  LSI Logic Corporation.
   6  *
   7  *         This program is free software; you can redistribute it and/or
   8  *         modify it under the terms of the GNU General Public License
   9  *         as published by the Free Software Foundation; either version
  10  *         2 of the License, or (at your option) any later version.
  11  *
  12  * FILE         : megaraid_sas.c
  13  * Version      : v00.00.02.00-rc4
  14  *
  15  * Authors:
  16  *      Sreenivas Bagalkote     <Sreenivas.Bagalkote@lsil.com>
  17  *      Sumant Patro            <Sumant.Patro@lsil.com>
  18  *
  19  * List of supported controllers
  20  *
  21  * OEM  Product Name                    VID     DID     SSVID   SSID
  22  * ---  ------------                    ---     ---     ----    ----
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/types.h>
  27 #include <linux/pci.h>
  28 #include <linux/list.h>
  29 #include <linux/moduleparam.h>
  30 #include <linux/module.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/delay.h>
  34 #include <linux/uio.h>
  35 #include <asm/uaccess.h>
  36 #include <linux/fs.h>
  37 #include <linux/compat.h>
  38
  39 #include <scsi/scsi.h>
  40 #include <scsi/scsi_cmnd.h>
  41 #include <scsi/scsi_device.h>
  42 #include <scsi/scsi_host.h>
  43 #include "megaraid_sas.h"
  44
  45 MODULE_LICENSE("GPL");
  46 MODULE_VERSION(MEGASAS_VERSION);
  47 MODULE_AUTHOR("sreenivas.bagalkote@lsil.com");
  48 MODULE_DESCRIPTION("LSI Logic MegaRAID SAS Driver");
  49
  50 /*
  51  * PCI ID table for all supported controllers
  52  */
  53 static struct pci_device_id megasas_pci_table[] = {
  54
  55         {
  56          PCI_VENDOR_ID_LSI_LOGIC,
  57          PCI_DEVICE_ID_LSI_SAS1064R,
  58          PCI_ANY_ID,
  59          PCI_ANY_ID,
  60          },
  61         {
  62          PCI_VENDOR_ID_DELL,
  63          PCI_DEVICE_ID_DELL_PERC5,
  64          PCI_ANY_ID,
  65          PCI_ANY_ID,
  66          },
  67         {0}                     /* Terminating entry */
  68 };
  69
  70 MODULE_DEVICE_TABLE(pci, megasas_pci_table);
  71
  72 static int megasas_mgmt_majorno;
  73 static struct megasas_mgmt_info megasas_mgmt_info;
  74 static struct fasync_struct *megasas_async_queue;
  75 static DECLARE_MUTEX(megasas_async_queue_mutex);
  76
  77 /**
  78  * megasas_get_cmd -    Get a command from the free pool
  79  * @instance:           Adapter soft state
  80  *
  81  * Returns a free command from the pool
  82  */
  83 static inline struct megasas_cmd *megasas_get_cmd(struct megasas_instance
  84                                                   *instance)
  85 {
  86         unsigned long flags;
  87         struct megasas_cmd *cmd = NULL;
  88
  89         spin_lock_irqsave(&instance->cmd_pool_lock, flags);
  90
  91         if (!list_empty(&instance->cmd_pool)) {
  92                 cmd = list_entry((&instance->cmd_pool)->next,
  93                                  struct megasas_cmd, list);
  94                 list_del_init(&cmd->list);
  95         } else {
  96                 printk(KERN_ERR "megasas: Command pool empty!\n");
  97         }
  98
  99         spin_unlock_irqrestore(&instance->cmd_pool_lock, flags);
 100         return cmd;
 101 }
 102
 103 /**
 104  * megasas_return_cmd - Return a cmd to free command pool
 105  * @instance:           Adapter soft state
 106  * @cmd:                Command packet to be returned to free command pool
 107  */
 108 static inline void
 109 megasas_return_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd)
 110 {
 111         unsigned long flags;
 112
 113         spin_lock_irqsave(&instance->cmd_pool_lock, flags);
 114
 115         cmd->scmd = NULL;
 116         list_add_tail(&cmd->list, &instance->cmd_pool);
 117
 118         spin_unlock_irqrestore(&instance->cmd_pool_lock, flags);
 119 }
 120
 121 /**
 122  * megasas_enable_intr -        Enables interrupts
 123  * @regs:                       MFI register set
 124  */
 125 static inline void
 126 megasas_enable_intr(struct megasas_register_set __iomem * regs)
 127 {
 128         writel(1, &(regs)->outbound_intr_mask);
 129
 130         /* Dummy readl to force pci flush */
 131         readl(&regs->outbound_intr_mask);
 132 }
 133
 134 /**
 135  * megasas_disable_intr -       Disables interrupts
 136  * @regs:                       MFI register set
 137  */
 138 static inline void
 139 megasas_disable_intr(struct megasas_register_set __iomem * regs)
 140 {
 141         u32 mask = readl(&regs->outbound_intr_mask) & (~0x00000001);
 142         writel(mask, &regs->outbound_intr_mask);
 143
 144         /* Dummy readl to force pci flush */
 145         readl(&regs->outbound_intr_mask);
 146 }
 147
 148 /**
 149  * megasas_issue_polled -       Issues a polling command
 150  * @instance:                   Adapter soft state
 151  * @cmd:                        Command packet to be issued
 152  *
 153  * For polling, MFI requires the cmd_status to be set to 0xFF before posting.
 154  */
 155 static int
 156 megasas_issue_polled(struct megasas_instance *instance, struct megasas_cmd *cmd)
 157 {
 158         int i;
 159         u32 msecs = MFI_POLL_TIMEOUT_SECS * 1000;
 160
 161         struct megasas_header *frame_hdr = &cmd->frame->hdr;
 162
 163         frame_hdr->cmd_status = 0xFF;
 164         frame_hdr->flags |= MFI_FRAME_DONT_POST_IN_REPLY_QUEUE;
 165
 166         /*
 167          * Issue the frame using inbound queue port
 168          */
 169         writel(cmd->frame_phys_addr >> 3,
 170                &instance->reg_set->inbound_queue_port);
 171
 172         /*
 173          * Wait for cmd_status to change
 174          */
 175         for (i = 0; (i < msecs) && (frame_hdr->cmd_status == 0xff); i++) {
 176                 rmb();
 177                 msleep(1);
 178         }
 179
 180         if (frame_hdr->cmd_status == 0xff)
 181                 return -ETIME;
 182
 183         return 0;
 184 }
 185
 186 /**
 187  * megasas_issue_blocked_cmd -  Synchronous wrapper around regular FW cmds
 188  * @instance:                   Adapter soft state
 189  * @cmd:                        Command to be issued
 190  *
 191  * This function waits on an event for the command to be returned from ISR.
 192  * Used to issue ioctl commands.
 193  */
 194 static int
 195 megasas_issue_blocked_cmd(struct megasas_instance *instance,
 196                           struct megasas_cmd *cmd)
 197 {
 198         cmd->cmd_status = ENODATA;
 199
 200         writel(cmd->frame_phys_addr >> 3,
 201                &instance->reg_set->inbound_queue_port);
 202
 203         wait_event(instance->int_cmd_wait_q, (cmd->cmd_status != ENODATA));
 204
 205         return 0;
 206 }
 207
 208 /**
 209  * megasas_issue_blocked_abort_cmd -    Aborts previously issued cmd
 210  * @instance:                           Adapter soft state
 211  * @cmd_to_abort:                       Previously issued cmd to be aborted
 212  *
 213  * MFI firmware can abort previously issued AEN comamnd (automatic event
 214  * notification). The megasas_issue_blocked_abort_cmd() issues such abort
 215  * cmd and blocks till it is completed.
 216  */
 217 static int
 218 megasas_issue_blocked_abort_cmd(struct megasas_instance *instance,
 219                                 struct megasas_cmd *cmd_to_abort)
 220 {
 221         struct megasas_cmd *cmd;
 222         struct megasas_abort_frame *abort_fr;
 223
 224         cmd = megasas_get_cmd(instance);
 225
 226         if (!cmd)
 227                 return -1;
 228
 229         abort_fr = &cmd->frame->abort;
 230
 231         /*
 232          * Prepare and issue the abort frame
 233          */
 234         abort_fr->cmd = MFI_CMD_ABORT;
 235         abort_fr->cmd_status = 0xFF;
 236         abort_fr->flags = 0;
 237         abort_fr->abort_context = cmd_to_abort->index;
 238         abort_fr->abort_mfi_phys_addr_lo = cmd_to_abort->frame_phys_addr;
 239         abort_fr->abort_mfi_phys_addr_hi = 0;
 240
 241         cmd->sync_cmd = 1;
 242         cmd->cmd_status = 0xFF;
 243
 244         writel(cmd->frame_phys_addr >> 3,
 245                &instance->reg_set->inbound_queue_port);
 246
 247         /*
 248          * Wait for this cmd to complete
 249          */
 250         wait_event(instance->abort_cmd_wait_q, (cmd->cmd_status != 0xFF));
 251
 252         megasas_return_cmd(instance, cmd);
 253         return 0;
 254 }
 255
 256 /**
 257  * megasas_make_sgl32 - Prepares 32-bit SGL
 258  * @instance:           Adapter soft state
 259  * @scp:                SCSI command from the mid-layer
 260  * @mfi_sgl:            SGL to be filled in
 261  *
 262  * If successful, this function returns the number of SG elements. Otherwise,
 263  * it returnes -1.
 264  */
 265 static inline int
 266 megasas_make_sgl32(struct megasas_instance *instance, struct scsi_cmnd *scp,
 267                    union megasas_sgl *mfi_sgl)
 268 {
 269         int i;
 270         int sge_count;
 271         struct scatterlist *os_sgl;
 272
 273         /*
 274          * Return 0 if there is no data transfer
 275          */
 276         if (!scp->request_buffer || !scp->request_bufflen)
 277                 return 0;
 278
 279         if (!scp->use_sg) {
 280                 mfi_sgl->sge32[0].phys_addr = pci_map_single(instance->pdev,
 281                                                              scp->
 282                                                              request_buffer,
 283                                                              scp->
 284                                                              request_bufflen,
 285                                                              scp->
 286                                                              sc_data_direction);
 287                 mfi_sgl->sge32[0].length = scp->request_bufflen;
 288
 289                 return 1;
 290         }
 291
 292         os_sgl = (struct scatterlist *)scp->request_buffer;
 293         sge_count = pci_map_sg(instance->pdev, os_sgl, scp->use_sg,
 294                                scp->sc_data_direction);
 295
 296         for (i = 0; i < sge_count; i++, os_sgl++) {
 297                 mfi_sgl->sge32[i].length = sg_dma_len(os_sgl);
 298                 mfi_sgl->sge32[i].phys_addr = sg_dma_address(os_sgl);
 299         }
 300
 301         return sge_count;
 302 }
 303
 304 /**
 305  * megasas_make_sgl64 - Prepares 64-bit SGL
 306  * @instance:           Adapter soft state
 307  * @scp:                SCSI command from the mid-layer
 308  * @mfi_sgl:            SGL to be filled in
 309  *
 310  * If successful, this function returns the number of SG elements. Otherwise,
 311  * it returnes -1.
 312  */
 313 static inline int
 314 megasas_make_sgl64(struct megasas_instance *instance, struct scsi_cmnd *scp,
 315                    union megasas_sgl *mfi_sgl)
 316 {
 317         int i;
 318         int sge_count;
 319         struct scatterlist *os_sgl;
 320
 321         /*
 322          * Return 0 if there is no data transfer
 323          */
 324         if (!scp->request_buffer || !scp->request_bufflen)
 325                 return 0;
 326
 327         if (!scp->use_sg) {
 328                 mfi_sgl->sge64[0].phys_addr = pci_map_single(instance->pdev,
 329                                                              scp->
 330                                                              request_buffer,
 331                                                              scp->
 332                                                              request_bufflen,
 333                                                              scp->
 334                                                              sc_data_direction);
 335
 336                 mfi_sgl->sge64[0].length = scp->request_bufflen;
 337
 338                 return 1;
 339         }
 340
 341         os_sgl = (struct scatterlist *)scp->request_buffer;
 342         sge_count = pci_map_sg(instance->pdev, os_sgl, scp->use_sg,
 343                                scp->sc_data_direction);
 344
 345         for (i = 0; i < sge_count; i++, os_sgl++) {
 346                 mfi_sgl->sge64[i].length = sg_dma_len(os_sgl);
 347                 mfi_sgl->sge64[i].phys_addr = sg_dma_address(os_sgl);
 348         }
 349
 350         return sge_count;
 351 }
 352
 353 /**
 354  * megasas_build_dcdb - Prepares a direct cdb (DCDB) command
 355  * @instance:           Adapter soft state
 356  * @scp:                SCSI command
 357  * @cmd:                Command to be prepared in
 358  *
 359  * This function prepares CDB commands. These are typcially pass-through
 360  * commands to the devices.
 361  */
 362 static inline int
 363 megasas_build_dcdb(struct megasas_instance *instance, struct scsi_cmnd *scp,
 364                    struct megasas_cmd *cmd)
 365 {
 366         u32 sge_sz;
 367         int sge_bytes;
 368         u32 is_logical;
 369         u32 device_id;
 370         u16 flags = 0;
 371         struct megasas_pthru_frame *pthru;
 372
 373         is_logical = MEGASAS_IS_LOGICAL(scp);
 374         device_id = MEGASAS_DEV_INDEX(instance, scp);
 375         pthru = (struct megasas_pthru_frame *)cmd->frame;
 376
 377         if (scp->sc_data_direction == PCI_DMA_TODEVICE)
 378                 flags = MFI_FRAME_DIR_WRITE;
 379         else if (scp->sc_data_direction == PCI_DMA_FROMDEVICE)
 380                 flags = MFI_FRAME_DIR_READ;
 381         else if (scp->sc_data_direction == PCI_DMA_NONE)
 382                 flags = MFI_FRAME_DIR_NONE;
 383
 384         /*
 385          * Prepare the DCDB frame
 386          */
 387         pthru->cmd = (is_logical) ? MFI_CMD_LD_SCSI_IO : MFI_CMD_PD_SCSI_IO;
 388         pthru->cmd_status = 0x0;
 389         pthru->scsi_status = 0x0;
 390         pthru->target_id = device_id;
 391         pthru->lun = scp->device->lun;
 392         pthru->cdb_len = scp->cmd_len;
 393         pthru->timeout = 0;
 394         pthru->flags = flags;
 395         pthru->data_xfer_len = scp->request_bufflen;
 396
 397         memcpy(pthru->cdb, scp->cmnd, scp->cmd_len);
 398
 399         /*
 400          * Construct SGL
 401          */
 402         sge_sz = (IS_DMA64) ? sizeof(struct megasas_sge64) :
 403             sizeof(struct megasas_sge32);
 404
 405         if (IS_DMA64) {
 406                 pthru->flags |= MFI_FRAME_SGL64;
 407                 pthru->sge_count = megasas_make_sgl64(instance, scp,
 408                                                       &pthru->sgl);
 409         } else
 410                 pthru->sge_count = megasas_make_sgl32(instance, scp,
 411                                                       &pthru->sgl);
 412
 413         /*
 414          * Sense info specific
 415          */
 416         pthru->sense_len = SCSI_SENSE_BUFFERSIZE;
 417         pthru->sense_buf_phys_addr_hi = 0;
 418         pthru->sense_buf_phys_addr_lo = cmd->sense_phys_addr;
 419
 420         sge_bytes = sge_sz * pthru->sge_count;
 421
 422         /*
 423          * Compute the total number of frames this command consumes. FW uses
 424          * this number to pull sufficient number of frames from host memory.
 425          */
 426         cmd->frame_count = (sge_bytes / MEGAMFI_FRAME_SIZE) +
 427             ((sge_bytes % MEGAMFI_FRAME_SIZE) ? 1 : 0) + 1;
 428
 429         if (cmd->frame_count > 7)
 430                 cmd->frame_count = 8;
 431
 432         return cmd->frame_count;
 433 }
 434
 435 /**
 436  * megasas_build_ldio - Prepares IOs to logical devices
 437  * @instance:           Adapter soft state
 438  * @scp:                SCSI command
 439  * @cmd:                Command to to be prepared
 440  *
 441  * Frames (and accompanying SGLs) for regular SCSI IOs use this function.
 442  */
 443 static inline int
 444 megasas_build_ldio(struct megasas_instance *instance, struct scsi_cmnd *scp,
 445                    struct megasas_cmd *cmd)
 446 {
 447         u32 sge_sz;
 448         int sge_bytes;
 449         u32 device_id;
 450         u8 sc = scp->cmnd[0];
 451         u16 flags = 0;
 452         struct megasas_io_frame *ldio;
 453
 454         device_id = MEGASAS_DEV_INDEX(instance, scp);
 455         ldio = (struct megasas_io_frame *)cmd->frame;
 456
 457         if (scp->sc_data_direction == PCI_DMA_TODEVICE)
 458                 flags = MFI_FRAME_DIR_WRITE;
 459         else if (scp->sc_data_direction == PCI_DMA_FROMDEVICE)
 460                 flags = MFI_FRAME_DIR_READ;
 461
 462         /*
 463          * Preare the Logical IO frame: 2nd bit is zero for all read cmds
 464          */
 465         ldio->cmd = (sc & 0x02) ? MFI_CMD_LD_WRITE : MFI_CMD_LD_READ;
 466         ldio->cmd_status = 0x0;
 467         ldio->scsi_status = 0x0;
 468         ldio->target_id = device_id;
 469         ldio->timeout = 0;
 470         ldio->reserved_0 = 0;
 471         ldio->pad_0 = 0;
 472         ldio->flags = flags;
 473         ldio->start_lba_hi = 0;
 474         ldio->access_byte = (scp->cmd_len != 6) ? scp->cmnd[1] : 0;
 475
 476         /*
 477          * 6-byte READ(0x08) or WRITE(0x0A) cdb
 478          */
 479         if (scp->cmd_len == 6) {
 480                 ldio->lba_count = (u32) scp->cmnd[4];
 481                 ldio->start_lba_lo = ((u32) scp->cmnd[1] << 16) |
 482                     ((u32) scp->cmnd[2] << 8) | (u32) scp->cmnd[3];
 483
 484                 ldio->start_lba_lo &= 0x1FFFFF;
 485         }
 486
 487         /*
 488          * 10-byte READ(0x28) or WRITE(0x2A) cdb
 489          */
 490         else if (scp->cmd_len == 10) {
 491                 ldio->lba_count = (u32) scp->cmnd[8] |
 492                     ((u32) scp->cmnd[7] << 8);
 493                 ldio->start_lba_lo = ((u32) scp->cmnd[2] << 24) |
 494                     ((u32) scp->cmnd[3] << 16) |
 495                     ((u32) scp->cmnd[4] << 8) | (u32) scp->cmnd[5];
 496         }
 497
 498         /*
 499          * 12-byte READ(0xA8) or WRITE(0xAA) cdb
 500          */
 501         else if (scp->cmd_len == 12) {
 502                 ldio->lba_count = ((u32) scp->cmnd[6] << 24) |
 503                     ((u32) scp->cmnd[7] << 16) |
 504                     ((u32) scp->cmnd[8] << 8) | (u32) scp->cmnd[9];
 505
 506                 ldio->start_lba_lo = ((u32) scp->cmnd[2] << 24) |
 507                     ((u32) scp->cmnd[3] << 16) |
 508                     ((u32) scp->cmnd[4] << 8) | (u32) scp->cmnd[5];
 509         }
 510
 511         /*
 512          * 16-byte READ(0x88) or WRITE(0x8A) cdb
 513          */
 514         else if (scp->cmd_len == 16) {
 515                 ldio->lba_count = ((u32) scp->cmnd[10] << 24) |
 516                     ((u32) scp->cmnd[11] << 16) |
 517                     ((u32) scp->cmnd[12] << 8) | (u32) scp->cmnd[13];
 518
 519                 ldio->start_lba_lo = ((u32) scp->cmnd[6] << 24) |
 520                     ((u32) scp->cmnd[7] << 16) |
 521                     ((u32) scp->cmnd[8] << 8) | (u32) scp->cmnd[9];
 522
 523                 ldio->start_lba_hi = ((u32) scp->cmnd[2] << 24) |
 524                     ((u32) scp->cmnd[3] << 16) |
 525                     ((u32) scp->cmnd[4] << 8) | (u32) scp->cmnd[5];
 526
 527         }
 528
 529         /*
 530          * Construct SGL
 531          */
 532         sge_sz = (IS_DMA64) ? sizeof(struct megasas_sge64) :
 533             sizeof(struct megasas_sge32);
 534
 535         if (IS_DMA64) {
 536                 ldio->flags |= MFI_FRAME_SGL64;
 537                 ldio->sge_count = megasas_make_sgl64(instance, scp, &ldio->sgl);
 538         } else
 539                 ldio->sge_count = megasas_make_sgl32(instance, scp, &ldio->sgl);
 540
 541         /*
 542          * Sense info specific
 543          */
 544         ldio->sense_len = SCSI_SENSE_BUFFERSIZE;
 545         ldio->sense_buf_phys_addr_hi = 0;
 546         ldio->sense_buf_phys_addr_lo = cmd->sense_phys_addr;
 547
 548         sge_bytes = sge_sz * ldio->sge_count;
 549
 550         cmd->frame_count = (sge_bytes / MEGAMFI_FRAME_SIZE) +
 551             ((sge_bytes % MEGAMFI_FRAME_SIZE) ? 1 : 0) + 1;
 552
 553         if (cmd->frame_count > 7)
 554                 cmd->frame_count = 8;
 555
 556         return cmd->frame_count;
 557 }
 558
 559 /**
 560  * megasas_build_cmd -  Prepares a command packet
 561  * @instance:           Adapter soft state
 562  * @scp:                SCSI command
 563  * @frame_count:        [OUT] Number of frames used to prepare this command
 564  */
 565 static inline struct megasas_cmd *megasas_build_cmd(struct megasas_instance
 566                                                     *instance,
 567                                                     struct scsi_cmnd *scp,
 568                                                     int *frame_count)
 569 {
 570         u32 logical_cmd;
 571         struct megasas_cmd *cmd;
 572
 573         /*
 574          * Find out if this is logical or physical drive command.
 575          */
 576         logical_cmd = MEGASAS_IS_LOGICAL(scp);
 577
 578         /*
 579          * Logical drive command
 580          */
 581         if (logical_cmd) {
 582
 583                 if (scp->device->id >= MEGASAS_MAX_LD) {
 584                         scp->result = DID_BAD_TARGET << 16;
 585                         return NULL;
 586                 }
 587
 588                 switch (scp->cmnd[0]) {
 589
 590                 case READ_10:
 591                 case WRITE_10:
 592                 case READ_12:
 593                 case WRITE_12:
 594                 case READ_6:
 595                 case WRITE_6:
 596                 case READ_16:
 597                 case WRITE_16:
 598                         /*
 599                          * Fail for LUN > 0
 600                          */
 601                         if (scp->device->lun) {
 602                                 scp->result = DID_BAD_TARGET << 16;
 603                                 return NULL;
 604                         }
 605
 606                         cmd = megasas_get_cmd(instance);
 607
 608                         if (!cmd) {
 609                                 scp->result = DID_IMM_RETRY << 16;
 610                                 return NULL;
 611                         }
 612
 613                         *frame_count = megasas_build_ldio(instance, scp, cmd);
 614
 615                         if (!(*frame_count)) {
 616                                 megasas_return_cmd(instance, cmd);
 617                                 return NULL;
 618                         }
 619
 620                         return cmd;
 621
 622                 default:
 623                         /*
 624                          * Fail for LUN > 0
 625                          */
 626                         if (scp->device->lun) {
 627                                 scp->result = DID_BAD_TARGET << 16;
 628                                 return NULL;
 629                         }
 630
 631                         cmd = megasas_get_cmd(instance);
 632
 633                         if (!cmd) {
 634                                 scp->result = DID_IMM_RETRY << 16;
 635                                 return NULL;
 636                         }
 637
 638                         *frame_count = megasas_build_dcdb(instance, scp, cmd);
 639
 640                         if (!(*frame_count)) {
 641                                 megasas_return_cmd(instance, cmd);
 642                                 return NULL;
 643                         }
 644
 645                         return cmd;
 646                 }
 647         } else {
 648                 cmd = megasas_get_cmd(instance);
 649
 650                 if (!cmd) {
 651                         scp->result = DID_IMM_RETRY << 16;
 652                         return NULL;
 653                 }
 654
 655                 *frame_count = megasas_build_dcdb(instance, scp, cmd);
 656
 657                 if (!(*frame_count)) {
 658                         megasas_return_cmd(instance, cmd);
 659                         return NULL;
 660                 }
 661
 662                 return cmd;
 663         }
 664
 665         return NULL;
 666 }
 667
 668 /**
 669  * megasas_queue_command -      Queue entry point
 670  * @scmd:                       SCSI command to be queued
 671  * @done:                       Callback entry point
 672  */
 673 static int
 674 megasas_queue_command(struct scsi_cmnd *scmd, void (*done) (struct scsi_cmnd *))
 675 {
 676         u32 frame_count;
 677         unsigned long flags;
 678         struct megasas_cmd *cmd;
 679         struct megasas_instance *instance;
 680
 681         instance = (struct megasas_instance *)
 682             scmd->device->host->hostdata;
 683         scmd->scsi_done = done;
 684         scmd->result = 0;
 685
 686         cmd = megasas_build_cmd(instance, scmd, &frame_count);
 687
 688         if (!cmd) {
 689                 done(scmd);
 690                 return 0;
 691         }
 692
 693         cmd->scmd = scmd;
 694         scmd->SCp.ptr = (char *)cmd;
 695         scmd->SCp.sent_command = jiffies;
 696
 697         /*
 698          * Issue the command to the FW
 699          */
 700         spin_lock_irqsave(&instance->instance_lock, flags);
 701         instance->fw_outstanding++;
 702         spin_unlock_irqrestore(&instance->instance_lock, flags);
 703
 704         writel(((cmd->frame_phys_addr >> 3) | (cmd->frame_count - 1)),
 705                &instance->reg_set->inbound_queue_port);
 706
 707         return 0;
 708 }
 709
 710 /**
 711  * megasas_wait_for_outstanding -       Wait for all outstanding cmds
 712  * @instance:                           Adapter soft state
 713  *
 714  * This function waits for upto MEGASAS_RESET_WAIT_TIME seconds for FW to
 715  * complete all its outstanding commands. Returns error if one or more IOs
 716  * are pending after this time period. It also marks the controller dead.
 717  */
 718 static int megasas_wait_for_outstanding(struct megasas_instance *instance)
 719 {
 720         int i;
 721         u32 wait_time = MEGASAS_RESET_WAIT_TIME;
 722
 723         for (i = 0; i < wait_time; i++) {
 724
 725                 if (!instance->fw_outstanding)
 726                         break;
 727
 728                 if (!(i % MEGASAS_RESET_NOTICE_INTERVAL)) {
 729                         printk(KERN_NOTICE "megasas: [%2d]waiting for %d "
 730                                "commands to complete\n", i,
 731                                instance->fw_outstanding);
 732                 }
 733
 734                 msleep(1000);
 735         }
 736
 737         if (instance->fw_outstanding) {
 738                 instance->hw_crit_error = 1;
 739                 return FAILED;
 740         }
 741
 742         return SUCCESS;
 743 }
 744
 745 /**
 746  * megasas_generic_reset -      Generic reset routine
 747  * @scmd:                       Mid-layer SCSI command
 748  *
 749  * This routine implements a generic reset handler for device, bus and host
 750  * reset requests. Device, bus and host specific reset handlers can use this
 751  * function after they do their specific tasks.
 752  */
 753 static int megasas_generic_reset(struct scsi_cmnd *scmd)
 754 {
 755         int ret_val;
 756         struct megasas_instance *instance;
 757
 758         instance = (struct megasas_instance *)scmd->device->host->hostdata;
 759
 760         scmd_printk(KERN_NOTICE, scmd, "megasas: RESET -%ld cmd=%x\n",
 761                scmd->serial_number, scmd->cmnd[0]);
 762
 763         if (instance->hw_crit_error) {
 764                 printk(KERN_ERR "megasas: cannot recover from previous reset "
 765                        "failures\n");
 766                 return FAILED;
 767         }
 768
 769         spin_unlock(scmd->device->host->host_lock);
 770
 771         ret_val = megasas_wait_for_outstanding(instance);
 772
 773         if (ret_val == SUCCESS)
 774                 printk(KERN_NOTICE "megasas: reset successful \n");
 775         else
 776                 printk(KERN_ERR "megasas: failed to do reset\n");
 777
 778         spin_lock(scmd->device->host->host_lock);
 779
 780         return ret_val;
 781 }
 782
 783 static enum scsi_eh_timer_return megasas_reset_timer(struct scsi_cmnd *scmd)
 784 {
 785         unsigned long seconds;
 786
 787         if (scmd->SCp.ptr) {
 788                 seconds = (jiffies - scmd->SCp.sent_command) / HZ;
 789
 790                 if (seconds < 90) {
 791                         return EH_RESET_TIMER;
 792                 } else {
 793                         return EH_NOT_HANDLED;
 794                 }
 795         }
 796
 797         return EH_HANDLED;
 798 }
 799
 800 /**
 801  * megasas_reset_device -       Device reset handler entry point
 802  */
 803 static int megasas_reset_device(struct scsi_cmnd *scmd)
 804 {
 805         int ret;
 806
 807         /*
 808          * First wait for all commands to complete
 809          */
 810         ret = megasas_generic_reset(scmd);
 811
 812         return ret;
 813 }
 814
 815 /**
 816  * megasas_reset_bus_host -     Bus & host reset handler entry point
 817  */
 818 static int megasas_reset_bus_host(struct scsi_cmnd *scmd)
 819 {
 820         int ret;
 821
 822         /*
 823          * Frist wait for all commands to complete
 824          */
 825         ret = megasas_generic_reset(scmd);
 826
 827         return ret;
 828 }
 829
 830 /**
 831  * megasas_service_aen -        Processes an event notification
 832  * @instance:                   Adapter soft state
 833  * @cmd:                        AEN command completed by the ISR
 834  *
 835  * For AEN, driver sends a command down to FW that is held by the FW till an
 836  * event occurs. When an event of interest occurs, FW completes the command
 837  * that it was previously holding.
 838  *
 839  * This routines sends SIGIO signal to processes that have registered with the
 840  * driver for AEN.
 841  */
 842 static void
 843 megasas_service_aen(struct megasas_instance *instance, struct megasas_cmd *cmd)
 844 {
 845         /*
 846          * Don't signal app if it is just an aborted previously registered aen
 847          */
 848         if (!cmd->abort_aen)
 849                 kill_fasync(&megasas_async_queue, SIGIO, POLL_IN);
 850         else
 851                 cmd->abort_aen = 0;
 852
 853         instance->aen_cmd = NULL;
 854         megasas_return_cmd(instance, cmd);
 855 }
 856
 857 /*
 858  * Scsi host template for megaraid_sas driver
 859  */
 860 static struct scsi_host_template megasas_template = {
 861
 862         .module = THIS_MODULE,
 863         .name = "LSI Logic SAS based MegaRAID driver",
 864         .proc_name = "megaraid_sas",
 865         .queuecommand = megasas_queue_command,
 866         .eh_device_reset_handler = megasas_reset_device,
 867         .eh_bus_reset_handler = megasas_reset_bus_host,
 868         .eh_host_reset_handler = megasas_reset_bus_host,
 869         .eh_timed_out = megasas_reset_timer,
 870         .use_clustering = ENABLE_CLUSTERING,
 871 };
 872
 873 /**
 874  * megasas_complete_int_cmd -   Completes an internal command
 875  * @instance:                   Adapter soft state
 876  * @cmd:                        Command to be completed
 877  *
 878  * The megasas_issue_blocked_cmd() function waits for a command to complete
 879  * after it issues a command. This function wakes up that waiting routine by
 880  * calling wake_up() on the wait queue.
 881  */
 882 static void
 883 megasas_complete_int_cmd(struct megasas_instance *instance,
 884                          struct megasas_cmd *cmd)
 885 {
 886         cmd->cmd_status = cmd->frame->io.cmd_status;
 887
 888         if (cmd->cmd_status == ENODATA) {
 889                 cmd->cmd_status = 0;
 890         }
 891         wake_up(&instance->int_cmd_wait_q);
 892 }
 893
 894 /**
 895  * megasas_complete_abort -     Completes aborting a command
 896  * @instance:                   Adapter soft state
 897  * @cmd:                        Cmd that was issued to abort another cmd
 898  *
 899  * The megasas_issue_blocked_abort_cmd() function waits on abort_cmd_wait_q
 900  * after it issues an abort on a previously issued command. This function
 901  * wakes up all functions waiting on the same wait queue.
 902  */
 903 static void
 904 megasas_complete_abort(struct megasas_instance *instance,
 905                        struct megasas_cmd *cmd)
 906 {
 907         if (cmd->sync_cmd) {
 908                 cmd->sync_cmd = 0;
 909                 cmd->cmd_status = 0;
 910                 wake_up(&instance->abort_cmd_wait_q);
 911         }
 912
 913         return;
 914 }
 915
 916 /**
 917  * megasas_unmap_sgbuf -        Unmap SG buffers
 918  * @instance:                   Adapter soft state
 919  * @cmd:                        Completed command
 920  */
 921 static inline void
 922 megasas_unmap_sgbuf(struct megasas_instance *instance, struct megasas_cmd *cmd)
 923 {
 924         dma_addr_t buf_h;
 925         u8 opcode;
 926
 927         if (cmd->scmd->use_sg) {
 928                 pci_unmap_sg(instance->pdev, cmd->scmd->request_buffer,
 929                              cmd->scmd->use_sg, cmd->scmd->sc_data_direction);
 930                 return;
 931         }
 932
 933         if (!cmd->scmd->request_bufflen)
 934                 return;
 935
 936         opcode = cmd->frame->hdr.cmd;
 937
 938         if ((opcode == MFI_CMD_LD_READ) || (opcode == MFI_CMD_LD_WRITE)) {
 939                 if (IS_DMA64)
 940                         buf_h = cmd->frame->io.sgl.sge64[0].phys_addr;
 941                 else
 942                         buf_h = cmd->frame->io.sgl.sge32[0].phys_addr;
 943         } else {
 944                 if (IS_DMA64)
 945                         buf_h = cmd->frame->pthru.sgl.sge64[0].phys_addr;
 946                 else
 947                         buf_h = cmd->frame->pthru.sgl.sge32[0].phys_addr;
 948         }
 949
 950         pci_unmap_single(instance->pdev, buf_h, cmd->scmd->request_bufflen,
 951                          cmd->scmd->sc_data_direction);
 952         return;
 953 }
 954
 955 /**
 956  * megasas_complete_cmd -       Completes a command
 957  * @instance:                   Adapter soft state
 958  * @cmd:                        Command to be completed
 959  * @alt_status:                 If non-zero, use this value as status to
 960  *                              SCSI mid-layer instead of the value returned
 961  *                              by the FW. This should be used if caller wants
 962  *                              an alternate status (as in the case of aborted
 963  *                              commands)
 964  */
 965 static inline void
 966 megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
 967                      u8 alt_status)
 968 {
 969         int exception = 0;
 970         struct megasas_header *hdr = &cmd->frame->hdr;
 971         unsigned long flags;
 972
 973         if (cmd->scmd) {
 974                 cmd->scmd->SCp.ptr = (char *)0;
 975         }
 976
 977         switch (hdr->cmd) {
 978
 979         case MFI_CMD_PD_SCSI_IO:
 980         case MFI_CMD_LD_SCSI_IO:
 981
 982                 /*
 983                  * MFI_CMD_PD_SCSI_IO and MFI_CMD_LD_SCSI_IO could have been
 984                  * issued either through an IO path or an IOCTL path. If it
 985                  * was via IOCTL, we will send it to internal completion.
 986                  */
 987                 if (cmd->sync_cmd) {
 988                         cmd->sync_cmd = 0;
 989                         megasas_complete_int_cmd(instance, cmd);
 990                         break;
 991                 }
 992
 993                 /*
 994                  * Don't export physical disk devices to mid-layer.
 995                  */
 996                 if (!MEGASAS_IS_LOGICAL(cmd->scmd) &&
 997                     (hdr->cmd_status == MFI_STAT_OK) &&
 998                     (cmd->scmd->cmnd[0] == INQUIRY)) {
 999
1000                         if (((*(u8 *) cmd->scmd->request_buffer) & 0x1F) ==
1001                             TYPE_DISK) {
1002                                 cmd->scmd->result = DID_BAD_TARGET << 16;
1003                                 exception = 1;
1004                         }
1005                 }
1006
1007         case MFI_CMD_LD_READ:
1008         case MFI_CMD_LD_WRITE:
1009
1010                 if (alt_status) {
1011                         cmd->scmd->result = alt_status << 16;
1012                         exception = 1;
1013                 }
1014
1015                 if (exception) {
1016
1017                         spin_lock_irqsave(&instance->instance_lock, flags);
1018                         instance->fw_outstanding--;
1019                         spin_unlock_irqrestore(&instance->instance_lock, flags);
1020
1021                         megasas_unmap_sgbuf(instance, cmd);
1022                         cmd->scmd->scsi_done(cmd->scmd);
1023                         megasas_return_cmd(instance, cmd);
1024
1025                         break;
1026                 }
1027
1028                 switch (hdr->cmd_status) {
1029
1030                 case MFI_STAT_OK:
1031                         cmd->scmd->result = DID_OK << 16;
1032                         break;
1033
1034                 case MFI_STAT_SCSI_IO_FAILED:
1035                 case MFI_STAT_LD_INIT_IN_PROGRESS:
1036                         cmd->scmd->result =
1037                             (DID_ERROR << 16) | hdr->scsi_status;
1038                         break;
1039
1040                 case MFI_STAT_SCSI_DONE_WITH_ERROR:
1041
1042                         cmd->scmd->result = (DID_OK << 16) | hdr->scsi_status;
1043
1044                         if (hdr->scsi_status == SAM_STAT_CHECK_CONDITION) {
1045                                 memset(cmd->scmd->sense_buffer, 0,
1046                                        SCSI_SENSE_BUFFERSIZE);
1047                                 memcpy(cmd->scmd->sense_buffer, cmd->sense,
1048                                        hdr->sense_len);
1049
1050                                 cmd->scmd->result |= DRIVER_SENSE << 24;
1051                         }
1052
1053                         break;
1054
1055                 case MFI_STAT_LD_OFFLINE:
1056                 case MFI_STAT_DEVICE_NOT_FOUND:
1057                         cmd->scmd->result = DID_BAD_TARGET << 16;
1058                         break;
1059
1060                 default:
1061                         printk(KERN_DEBUG "megasas: MFI FW status %#x\n",
1062                                hdr->cmd_status);
1063                         cmd->scmd->result = DID_ERROR << 16;
1064                         break;
1065                 }
1066
1067                 spin_lock_irqsave(&instance->instance_lock, flags);
1068                 instance->fw_outstanding--;
1069                 spin_unlock_irqrestore(&instance->instance_lock, flags);
1070
1071                 megasas_unmap_sgbuf(instance, cmd);
1072                 cmd->scmd->scsi_done(cmd->scmd);
1073                 megasas_return_cmd(instance, cmd);
1074
1075                 break;
1076
1077         case MFI_CMD_SMP:
1078         case MFI_CMD_STP:
1079         case MFI_CMD_DCMD:
1080
1081                 /*
1082                  * See if got an event notification
1083                  */
1084                 if (cmd->frame->dcmd.opcode == MR_DCMD_CTRL_EVENT_WAIT)
1085                         megasas_service_aen(instance, cmd);
1086                 else
1087                         megasas_complete_int_cmd(instance, cmd);
1088
1089                 break;
1090
1091         case MFI_CMD_ABORT:
1092                 /*
1093                  * Cmd issued to abort another cmd returned
1094                  */
1095                 megasas_complete_abort(instance, cmd);
1096                 break;
1097
1098         default:
1099                 printk("megasas: Unknown command completed! [0x%X]\n",
1100                        hdr->cmd);
1101                 break;
1102         }
1103 }
1104
1105 /**
1106  * megasas_deplete_reply_queue -        Processes all completed commands
1107  * @instance:                           Adapter soft state
1108  * @alt_status:                         Alternate status to be returned to
1109  *                                      SCSI mid-layer instead of the status
1110  *                                      returned by the FW
1111  */
1112 static inline int
1113 megasas_deplete_reply_queue(struct megasas_instance *instance, u8 alt_status)
1114 {
1115         u32 status;
1116         u32 producer;
1117         u32 consumer;
1118         u32 context;
1119         struct megasas_cmd *cmd;
1120
1121         /*
1122          * Check if it is our interrupt
1123          */
1124         status = readl(&instance->reg_set->outbound_intr_status);
1125
1126         if (!(status & MFI_OB_INTR_STATUS_MASK)) {
1127                 return IRQ_NONE;
1128         }
1129
1130         /*
1131          * Clear the interrupt by writing back the same value
1132          */
1133         writel(status, &instance->reg_set->outbound_intr_status);
1134
1135         producer = *instance->producer;
1136         consumer = *instance->consumer;
1137
1138         while (consumer != producer) {
1139                 context = instance->reply_queue[consumer];
1140
1141                 cmd = instance->cmd_list[context];
1142
1143                 megasas_complete_cmd(instance, cmd, alt_status);
1144
1145                 consumer++;
1146                 if (consumer == (instance->max_fw_cmds + 1)) {
1147                         consumer = 0;
1148                 }
1149         }
1150
1151         *instance->consumer = producer;
1152
1153         return IRQ_HANDLED;
1154 }
1155
1156 /**
1157  * megasas_isr - isr entry point
1158  */
1159 static irqreturn_t megasas_isr(int irq, void *devp, struct pt_regs *regs)
1160 {
1161         return megasas_deplete_reply_queue((struct megasas_instance *)devp,
1162                                            DID_OK);
1163 }
1164
1165 /**
1166  * megasas_transition_to_ready -        Move the FW to READY state
1167  * @reg_set:                            MFI register set
1168  *
1169  * During the initialization, FW passes can potentially be in any one of
1170  * several possible states. If the FW in operational, waiting-for-handshake
1171  * states, driver must take steps to bring it to ready state. Otherwise, it
1172  * has to wait for the ready state.
1173  */
1174 static int
1175 megasas_transition_to_ready(struct megasas_register_set __iomem * reg_set)
1176 {
1177         int i;
1178         u8 max_wait;
1179         u32 fw_state;
1180         u32 cur_state;
1181
1182         fw_state = readl(&reg_set->outbound_msg_0) & MFI_STATE_MASK;
1183
1184         while (fw_state != MFI_STATE_READY) {
1185
1186                 printk(KERN_INFO "megasas: Waiting for FW to come to ready"
1187                        " state\n");
1188                 switch (fw_state) {
1189
1190                 case MFI_STATE_FAULT:
1191
1192                         printk(KERN_DEBUG "megasas: FW in FAULT state!!\n");
1193                         return -ENODEV;
1194
1195                 case MFI_STATE_WAIT_HANDSHAKE:
1196                         /*
1197                          * Set the CLR bit in inbound doorbell
1198                          */
1199                         writel(MFI_INIT_CLEAR_HANDSHAKE,
1200                                &reg_set->inbound_doorbell);
1201
1202                         max_wait = 2;
1203                         cur_state = MFI_STATE_WAIT_HANDSHAKE;
1204                         break;
1205
1206                 case MFI_STATE_OPERATIONAL:
1207                         /*
1208                          * Bring it to READY state; assuming max wait 2 secs
1209                          */
1210                         megasas_disable_intr(reg_set);
1211                         writel(MFI_INIT_READY, &reg_set->inbound_doorbell);
1212
1213                         max_wait = 10;
1214                         cur_state = MFI_STATE_OPERATIONAL;
1215                         break;
1216
1217                 case MFI_STATE_UNDEFINED:
1218                         /*
1219                          * This state should not last for more than 2 seconds
1220                          */
1221                         max_wait = 2;
1222                         cur_state = MFI_STATE_UNDEFINED;
1223                         break;
1224
1225                 case MFI_STATE_BB_INIT:
1226                         max_wait = 2;
1227                         cur_state = MFI_STATE_BB_INIT;
1228                         break;
1229
1230                 case MFI_STATE_FW_INIT:
1231                         max_wait = 20;
1232                         cur_state = MFI_STATE_FW_INIT;
1233                         break;
1234
1235                 case MFI_STATE_FW_INIT_2:
1236                         max_wait = 20;
1237                         cur_state = MFI_STATE_FW_INIT_2;
1238                         break;
1239
1240                 case MFI_STATE_DEVICE_SCAN:
1241                         max_wait = 20;
1242                         cur_state = MFI_STATE_DEVICE_SCAN;
1243                         break;
1244
1245                 case MFI_STATE_FLUSH_CACHE:
1246                         max_wait = 20;
1247                         cur_state = MFI_STATE_FLUSH_CACHE;
1248                         break;
1249
1250                 default:
1251                         printk(KERN_DEBUG "megasas: Unknown state 0x%x\n",
1252                                fw_state);
1253                         return -ENODEV;
1254                 }
1255
1256                 /*
1257                  * The cur_state should not last for more than max_wait secs
1258                  */
1259                 for (i = 0; i < (max_wait * 1000); i++) {
1260                         fw_state = MFI_STATE_MASK &
1261                             readl(&reg_set->outbound_msg_0);
1262
1263                         if (fw_state == cur_state) {
1264                                 msleep(1);
1265                         } else
1266                                 break;
1267                 }
1268
1269                 /*
1270                  * Return error if fw_state hasn't changed after max_wait
1271                  */
1272                 if (fw_state == cur_state) {
1273                         printk(KERN_DEBUG "FW state [%d] hasn't changed "
1274                                "in %d secs\n", fw_state, max_wait);
1275                         return -ENODEV;
1276                 }
1277         };
1278
1279         return 0;
1280 }
1281
1282 /**
1283  * megasas_teardown_frame_pool -        Destroy the cmd frame DMA pool
1284  * @instance:                           Adapter soft state
1285  */
1286 static void megasas_teardown_frame_pool(struct megasas_instance *instance)
1287 {
1288         int i;
1289         u32 max_cmd = instance->max_fw_cmds;
1290         struct megasas_cmd *cmd;
1291
1292         if (!instance->frame_dma_pool)
1293                 return;
1294
1295         /*
1296          * Return all frames to pool
1297          */
1298         for (i = 0; i < max_cmd; i++) {
1299
1300                 cmd = instance->cmd_list[i];
1301
1302                 if (cmd->frame)
1303                         pci_pool_free(instance->frame_dma_pool, cmd->frame,
1304                                       cmd->frame_phys_addr);
1305
1306                 if (cmd->sense)
1307                         pci_pool_free(instance->sense_dma_pool, cmd->frame,
1308                                       cmd->sense_phys_addr);
1309         }
1310
1311         /*
1312          * Now destroy the pool itself
1313          */
1314         pci_pool_destroy(instance->frame_dma_pool);
1315         pci_pool_destroy(instance->sense_dma_pool);
1316
1317         instance->frame_dma_pool = NULL;
1318         instance->sense_dma_pool = NULL;
1319 }
1320
1321 /**
1322  * megasas_create_frame_pool -  Creates DMA pool for cmd frames
1323  * @instance:                   Adapter soft state
1324  *
1325  * Each command packet has an embedded DMA memory buffer that is used for
1326  * filling MFI frame and the SG list that immediately follows the frame. This
1327  * function creates those DMA memory buffers for each command packet by using
1328  * PCI pool facility.
1329  */
1330 static int megasas_create_frame_pool(struct megasas_instance *instance)
1331 {
1332         int i;
1333         u32 max_cmd;
1334         u32 sge_sz;
1335         u32 sgl_sz;
1336         u32 total_sz;
1337         u32 frame_count;
1338         struct megasas_cmd *cmd;
1339
1340         max_cmd = instance->max_fw_cmds;
1341
1342         /*
1343          * Size of our frame is 64 bytes for MFI frame, followed by max SG
1344          * elements and finally SCSI_SENSE_BUFFERSIZE bytes for sense buffer
1345          */
1346         sge_sz = (IS_DMA64) ? sizeof(struct megasas_sge64) :
1347             sizeof(struct megasas_sge32);
1348
1349         /*
1350          * Calculated the number of 64byte frames required for SGL
1351          */
1352         sgl_sz = sge_sz * instance->max_num_sge;
1353         frame_count = (sgl_sz + MEGAMFI_FRAME_SIZE - 1) / MEGAMFI_FRAME_SIZE;
1354
1355         /*
1356          * We need one extra frame for the MFI command
1357          */
1358         frame_count++;
1359
1360         total_sz = MEGAMFI_FRAME_SIZE * frame_count;
1361         /*
1362          * Use DMA pool facility provided by PCI layer
1363          */
1364         instance->frame_dma_pool = pci_pool_create("megasas frame pool",
1365                                                    instance->pdev, total_sz, 64,
1366                                                    0);
1367
1368         if (!instance->frame_dma_pool) {
1369                 printk(KERN_DEBUG "megasas: failed to setup frame pool\n");
1370                 return -ENOMEM;
1371         }
1372
1373         instance->sense_dma_pool = pci_pool_create("megasas sense pool",
1374                                                    instance->pdev, 128, 4, 0);
1375
1376         if (!instance->sense_dma_pool) {
1377                 printk(KERN_DEBUG "megasas: failed to setup sense pool\n");
1378
1379                 pci_pool_destroy(instance->frame_dma_pool);
1380                 instance->frame_dma_pool = NULL;
1381
1382                 return -ENOMEM;
1383         }
1384
1385         /*
1386          * Allocate and attach a frame to each of the commands in cmd_list.
1387          * By making cmd->index as the context instead of the &cmd, we can
1388          * always use 32bit context regardless of the architecture
1389          */
1390         for (i = 0; i < max_cmd; i++) {
1391
1392                 cmd = instance->cmd_list[i];
1393
1394                 cmd->frame = pci_pool_alloc(instance->frame_dma_pool,
1395                                             GFP_KERNEL, &cmd->frame_phys_addr);
1396
1397                 cmd->sense = pci_pool_alloc(instance->sense_dma_pool,
1398                                             GFP_KERNEL, &cmd->sense_phys_addr);
1399
1400                 /*
1401                  * megasas_teardown_frame_pool() takes care of freeing
1402                  * whatever has been allocated
1403                  */
1404                 if (!cmd->frame || !cmd->sense) {
1405                         printk(KERN_DEBUG "megasas: pci_pool_alloc failed \n");
1406                         megasas_teardown_frame_pool(instance);
1407                         return -ENOMEM;
1408                 }
1409
1410                 cmd->frame->io.context = cmd->index;
1411         }
1412
1413         return 0;
1414 }
1415
1416 /**
1417  * megasas_free_cmds -  Free all the cmds in the free cmd pool
1418  * @instance:           Adapter soft state
1419  */
1420 static void megasas_free_cmds(struct megasas_instance *instance)
1421 {
1422         int i;
1423         /* First free the MFI frame pool */
1424         megasas_teardown_frame_pool(instance);
1425
1426         /* Free all the commands in the cmd_list */
1427         for (i = 0; i < instance->max_fw_cmds; i++)
1428                 kfree(instance->cmd_list[i]);
1429
1430         /* Free the cmd_list buffer itself */
1431         kfree(instance->cmd_list);
1432         instance->cmd_list = NULL;
1433
1434         INIT_LIST_HEAD(&instance->cmd_pool);
1435 }
1436
1437 /**
1438  * megasas_alloc_cmds - Allocates the command packets
1439  * @instance:           Adapter soft state
1440  *
1441  * Each command that is issued to the FW, whether IO commands from the OS or
1442  * internal commands like IOCTLs, are wrapped in local data structure called
1443  * megasas_cmd. The frame embedded in this megasas_cmd is actually issued to
1444  * the FW.
1445  *
1446  * Each frame has a 32-bit field called context (tag). This context is used
1447  * to get back the megasas_cmd from the frame when a frame gets completed in
1448  * the ISR. Typically the address of the megasas_cmd itself would be used as
1449  * the context. But we wanted to keep the differences between 32 and 64 bit
1450  * systems to the mininum. We always use 32 bit integers for the context. In
1451  * this driver, the 32 bit values are the indices into an array cmd_list.
1452  * This array is used only to look up the megasas_cmd given the context. The
1453  * free commands themselves are maintained in a linked list called cmd_pool.
1454  */
1455 static int megasas_alloc_cmds(struct megasas_instance *instance)
1456 {
1457         int i;
1458         int j;
1459         u32 max_cmd;
1460         struct megasas_cmd *cmd;
1461
1462         max_cmd = instance->max_fw_cmds;
1463
1464         /*
1465          * instance->cmd_list is an array of struct megasas_cmd pointers.
1466          * Allocate the dynamic array first and then allocate individual
1467          * commands.
1468          */
1469         instance->cmd_list = kmalloc(sizeof(struct megasas_cmd *) * max_cmd,
1470                                      GFP_KERNEL);
1471
1472         if (!instance->cmd_list) {
1473                 printk(KERN_DEBUG "megasas: out of memory\n");
1474                 return -ENOMEM;
1475         }
1476
1477         memset(instance->cmd_list, 0, sizeof(struct megasas_cmd *) * max_cmd);
1478
1479         for (i = 0; i < max_cmd; i++) {
1480                 instance->cmd_list[i] = kmalloc(sizeof(struct megasas_cmd),
1481                                                 GFP_KERNEL);
1482
1483                 if (!instance->cmd_list[i]) {
1484
1485                         for (j = 0; j < i; j++)
1486                                 kfree(instance->cmd_list[j]);
1487
1488                         kfree(instance->cmd_list);
1489                         instance->cmd_list = NULL;
1490
1491                         return -ENOMEM;
1492                 }
1493         }
1494
1495         /*
1496          * Add all the commands to command pool (instance->cmd_pool)
1497          */
1498         for (i = 0; i < max_cmd; i++) {
1499                 cmd = instance->cmd_list[i];
1500                 memset(cmd, 0, sizeof(struct megasas_cmd));
1501                 cmd->index = i;
1502                 cmd->instance = instance;
1503
1504                 list_add_tail(&cmd->list, &instance->cmd_pool);
1505         }
1506
1507         /*
1508          * Create a frame pool and assign one frame to each cmd
1509          */
1510         if (megasas_create_frame_pool(instance)) {
1511                 printk(KERN_DEBUG "megasas: Error creating frame DMA pool\n");
1512                 megasas_free_cmds(instance);
1513         }
1514
1515         return 0;
1516 }
1517
1518 /**
1519  * megasas_get_controller_info -        Returns FW's controller structure
1520  * @instance:                           Adapter soft state
1521  * @ctrl_info:                          Controller information structure
1522  *
1523  * Issues an internal command (DCMD) to get the FW's controller structure.
1524  * This information is mainly used to find out the maximum IO transfer per
1525  * command supported by the FW.
1526  */
1527 static int
1528 megasas_get_ctrl_info(struct megasas_instance *instance,
1529                       struct megasas_ctrl_info *ctrl_info)
1530 {
1531         int ret = 0;
1532         struct megasas_cmd *cmd;
1533         struct megasas_dcmd_frame *dcmd;
1534         struct megasas_ctrl_info *ci;
1535         dma_addr_t ci_h = 0;
1536
1537         cmd = megasas_get_cmd(instance);
1538
1539         if (!cmd) {
1540                 printk(KERN_DEBUG "megasas: Failed to get a free cmd\n");
1541                 return -ENOMEM;
1542         }
1543
1544         dcmd = &cmd->frame->dcmd;
1545
1546         ci = pci_alloc_consistent(instance->pdev,
1547                                   sizeof(struct megasas_ctrl_info), &ci_h);
1548
1549         if (!ci) {
1550                 printk(KERN_DEBUG "Failed to alloc mem for ctrl info\n");
1551                 megasas_return_cmd(instance, cmd);
1552                 return -ENOMEM;
1553         }
1554
1555         memset(ci, 0, sizeof(*ci));
1556         memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);
1557
1558         dcmd->cmd = MFI_CMD_DCMD;
1559         dcmd->cmd_status = 0xFF;
1560         dcmd->sge_count = 1;
1561         dcmd->flags = MFI_FRAME_DIR_READ;
1562         dcmd->timeout = 0;
1563         dcmd->data_xfer_len = sizeof(struct megasas_ctrl_info);
1564         dcmd->opcode = MR_DCMD_CTRL_GET_INFO;
1565         dcmd->sgl.sge32[0].phys_addr = ci_h;
1566         dcmd->sgl.sge32[0].length = sizeof(struct megasas_ctrl_info);
1567
1568         if (!megasas_issue_polled(instance, cmd)) {
1569                 ret = 0;
1570                 memcpy(ctrl_info, ci, sizeof(struct megasas_ctrl_info));
1571         } else {
1572                 ret = -1;
1573         }
1574
1575         pci_free_consistent(instance->pdev, sizeof(struct megasas_ctrl_info),
1576                             ci, ci_h);
1577
1578         megasas_return_cmd(instance, cmd);
1579         return ret;
1580 }
1581
1582 /**
1583  * megasas_init_mfi -   Initializes the FW
1584  * @instance:           Adapter soft state
1585  *
1586  * This is the main function for initializing MFI firmware.
1587  */
1588 static int megasas_init_mfi(struct megasas_instance *instance)
1589 {
1590         u32 context_sz;
1591         u32 reply_q_sz;
1592         u32 max_sectors_1;
1593         u32 max_sectors_2;
1594         struct megasas_register_set __iomem *reg_set;
1595
1596         struct megasas_cmd *cmd;
1597         struct megasas_ctrl_info *ctrl_info;
1598
1599         struct megasas_init_frame *init_frame;
1600         struct megasas_init_queue_info *initq_info;
1601         dma_addr_t init_frame_h;
1602         dma_addr_t initq_info_h;
1603
1604         /*
1605          * Map the message registers
1606          */
1607         instance->base_addr = pci_resource_start(instance->pdev, 0);
1608
1609         if (pci_request_regions(instance->pdev, "megasas: LSI Logic")) {
1610                 printk(KERN_DEBUG "megasas: IO memory region busy!\n");
1611                 return -EBUSY;
1612         }
1613
1614         instance->reg_set = ioremap_nocache(instance->base_addr, 8192);
1615
1616         if (!instance->reg_set) {
1617                 printk(KERN_DEBUG "megasas: Failed to map IO mem\n");
1618                 goto fail_ioremap;
1619         }
1620
1621         reg_set = instance->reg_set;
1622
1623         /*
1624          * We expect the FW state to be READY
1625          */
1626         if (megasas_transition_to_ready(instance->reg_set))
1627                 goto fail_ready_state;
1628
1629         /*
1630          * Get various operational parameters from status register
1631          */
1632         instance->max_fw_cmds = readl(&reg_set->outbound_msg_0) & 0x00FFFF;
1633         instance->max_num_sge = (readl(&reg_set->outbound_msg_0) & 0xFF0000) >>
1634             0x10;
1635         /*
1636          * Create a pool of commands
1637          */
1638         if (megasas_alloc_cmds(instance))
1639                 goto fail_alloc_cmds;
1640
1641         /*
1642          * Allocate memory for reply queue. Length of reply queue should
1643          * be _one_ more than the maximum commands handled by the firmware.
1644          *
1645          * Note: When FW completes commands, it places corresponding contex
1646          * values in this circular reply queue. This circular queue is a fairly
1647          * typical producer-consumer queue. FW is the producer (of completed
1648          * commands) and the driver is the consumer.
1649          */
1650         context_sz = sizeof(u32);
1651         reply_q_sz = context_sz * (instance->max_fw_cmds + 1);
1652
1653         instance->reply_queue = pci_alloc_consistent(instance->pdev,
1654                                                      reply_q_sz,
1655                                                      &instance->reply_queue_h);
1656
1657         if (!instance->reply_queue) {
1658                 printk(KERN_DEBUG "megasas: Out of DMA mem for reply queue\n");
1659                 goto fail_reply_queue;
1660         }
1661
1662         /*
1663          * Prepare a init frame. Note the init frame points to queue info
1664          * structure. Each frame has SGL allocated after first 64 bytes. For
1665          * this frame - since we don't need any SGL - we use SGL's space as
1666          * queue info structure
1667          *
1668          * We will not get a NULL command below. We just created the pool.
1669          */
1670         cmd = megasas_get_cmd(instance);
1671
1672         init_frame = (struct megasas_init_frame *)cmd->frame;
1673         initq_info = (struct megasas_init_queue_info *)
1674             ((unsigned long)init_frame + 64);
1675
1676         init_frame_h = cmd->frame_phys_addr;
1677         initq_info_h = init_frame_h + 64;
1678
1679         memset(init_frame, 0, MEGAMFI_FRAME_SIZE);
1680         memset(initq_info, 0, sizeof(struct megasas_init_queue_info));
1681
1682         initq_info->reply_queue_entries = instance->max_fw_cmds + 1;
1683         initq_info->reply_queue_start_phys_addr_lo = instance->reply_queue_h;
1684
1685         initq_info->producer_index_phys_addr_lo = instance->producer_h;
1686         initq_info->consumer_index_phys_addr_lo = instance->consumer_h;
1687
1688         init_frame->cmd = MFI_CMD_INIT;
1689         init_frame->cmd_status = 0xFF;
1690         init_frame->queue_info_new_phys_addr_lo = initq_info_h;
1691
1692         init_frame->data_xfer_len = sizeof(struct megasas_init_queue_info);
1693
1694         /*
1695          * Issue the init frame in polled mode
1696          */
1697         if (megasas_issue_polled(instance, cmd)) {
1698                 printk(KERN_DEBUG "megasas: Failed to init firmware\n");
1699                 goto fail_fw_init;
1700         }
1701
1702         megasas_return_cmd(instance, cmd);
1703
1704         ctrl_info = kmalloc(sizeof(struct megasas_ctrl_info), GFP_KERNEL);
1705
1706         /*
1707          * Compute the max allowed sectors per IO: The controller info has two
1708          * limits on max sectors. Driver should use the minimum of these two.
1709          *
1710          * 1 << stripe_sz_ops.min = max sectors per strip
1711          *
1712          * Note that older firmwares ( < FW ver 30) didn't report information
1713          * to calculate max_sectors_1. So the number ended up as zero always.
1714          */
1715         if (ctrl_info && !megasas_get_ctrl_info(instance, ctrl_info)) {
1716
1717                 max_sectors_1 = (1 << ctrl_info->stripe_sz_ops.min) *
1718                     ctrl_info->max_strips_per_io;
1719                 max_sectors_2 = ctrl_info->max_request_size;
1720
1721                 instance->max_sectors_per_req = (max_sectors_1 < max_sectors_2)
1722                     ? max_sectors_1 : max_sectors_2;
1723         } else
1724                 instance->max_sectors_per_req = instance->max_num_sge *
1725                     PAGE_SIZE / 512;
1726
1727         kfree(ctrl_info);
1728
1729         return 0;
1730
1731       fail_fw_init:
1732         megasas_return_cmd(instance, cmd);
1733
1734         pci_free_consistent(instance->pdev, reply_q_sz,
1735                             instance->reply_queue, instance->reply_queue_h);
1736       fail_reply_queue:
1737         megasas_free_cmds(instance);
1738
1739       fail_alloc_cmds:
1740       fail_ready_state:
1741         iounmap(instance->reg_set);
1742
1743       fail_ioremap:
1744         pci_release_regions(instance->pdev);
1745
1746         return -EINVAL;
1747 }
1748
1749 /**
1750  * megasas_release_mfi -        Reverses the FW initialization
1751  * @intance:                    Adapter soft state
1752  */
1753 static void megasas_release_mfi(struct megasas_instance *instance)
1754 {
1755         u32 reply_q_sz = sizeof(u32) * (instance->max_fw_cmds + 1);
1756
1757         pci_free_consistent(instance->pdev, reply_q_sz,
1758                             instance->reply_queue, instance->reply_queue_h);
1759
1760         megasas_free_cmds(instance);
1761
1762         iounmap(instance->reg_set);
1763
1764         pci_release_regions(instance->pdev);
1765 }
1766
1767 /**
1768  * megasas_get_seq_num -        Gets latest event sequence numbers
1769  * @instance:                   Adapter soft state
1770  * @eli:                        FW event log sequence numbers information
1771  *
1772  * FW maintains a log of all events in a non-volatile area. Upper layers would
1773  * usually find out the latest sequence number of the events, the seq number at
1774  * the boot etc. They would "read" all the events below the latest seq number
1775  * by issuing a direct fw cmd (DCMD). For the future events (beyond latest seq
1776  * number), they would subsribe to AEN (asynchronous event notification) and
1777  * wait for the events to happen.
1778  */
1779 static int
1780 megasas_get_seq_num(struct megasas_instance *instance,
1781                     struct megasas_evt_log_info *eli)
1782 {
1783         struct megasas_cmd *cmd;
1784         struct megasas_dcmd_frame *dcmd;
1785         struct megasas_evt_log_info *el_info;
1786         dma_addr_t el_info_h = 0;
1787
1788         cmd = megasas_get_cmd(instance);
1789
1790         if (!cmd) {
1791                 return -ENOMEM;
1792         }
1793
1794         dcmd = &cmd->frame->dcmd;
1795         el_info = pci_alloc_consistent(instance->pdev,
1796                                        sizeof(struct megasas_evt_log_info),
1797                                        &el_info_h);
1798
1799         if (!el_info) {
1800                 megasas_return_cmd(instance, cmd);
1801                 return -ENOMEM;
1802         }
1803
1804         memset(el_info, 0, sizeof(*el_info));
1805         memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);
1806
1807         dcmd->cmd = MFI_CMD_DCMD;
1808         dcmd->cmd_status = 0x0;
1809         dcmd->sge_count = 1;
1810         dcmd->flags = MFI_FRAME_DIR_READ;
1811         dcmd->timeout = 0;
1812         dcmd->data_xfer_len = sizeof(struct megasas_evt_log_info);
1813         dcmd->opcode = MR_DCMD_CTRL_EVENT_GET_INFO;
1814         dcmd->sgl.sge32[0].phys_addr = el_info_h;
1815         dcmd->sgl.sge32[0].length = sizeof(struct megasas_evt_log_info);
1816
1817         megasas_issue_blocked_cmd(instance, cmd);
1818
1819         /*
1820          * Copy the data back into callers buffer
1821          */
1822         memcpy(eli, el_info, sizeof(struct megasas_evt_log_info));
1823
1824         pci_free_consistent(instance->pdev, sizeof(struct megasas_evt_log_info),
1825                             el_info, el_info_h);
1826
1827         megasas_return_cmd(instance, cmd);
1828
1829         return 0;
1830 }
1831
1832 /**
1833  * megasas_register_aen -       Registers for asynchronous event notification
1834  * @instance:                   Adapter soft state
1835  * @seq_num:                    The starting sequence number
1836  * @class_locale:               Class of the event
1837  *
1838  * This function subscribes for AEN for events beyond the @seq_num. It requests
1839  * to be notified if and only if the event is of type @class_locale
1840  */
1841 static int
1842 megasas_register_aen(struct megasas_instance *instance, u32 seq_num,
1843                      u32 class_locale_word)
1844 {
1845         int ret_val;
1846         struct megasas_cmd *cmd;
1847         struct megasas_dcmd_frame *dcmd;
1848         union megasas_evt_class_locale curr_aen;
1849         union megasas_evt_class_locale prev_aen;
1850
1851         /*
1852          * If there an AEN pending already (aen_cmd), check if the
1853          * class_locale of that pending AEN is inclusive of the new
1854          * AEN request we currently have. If it is, then we don't have
1855          * to do anything. In other words, whichever events the current
1856          * AEN request is subscribing to, have already been subscribed
1857          * to.
1858          *
1859          * If the old_cmd is _not_ inclusive, then we have to abort
1860          * that command, form a class_locale that is superset of both
1861          * old and current and re-issue to the FW
1862          */
1863
1864         curr_aen.word = class_locale_word;
1865
1866         if (instance->aen_cmd) {
1867
1868                 prev_aen.word = instance->aen_cmd->frame->dcmd.mbox.w[1];
1869
1870                 /*
1871                  * A class whose enum value is smaller is inclusive of all
1872                  * higher values. If a PROGRESS (= -1) was previously
1873                  * registered, then a new registration requests for higher
1874                  * classes need not be sent to FW. They are automatically
1875                  * included.
1876                  *
1877                  * Locale numbers don't have such hierarchy. They are bitmap
1878                  * values
1879                  */
1880                 if ((prev_aen.members.class <= curr_aen.members.class) &&
1881                     !((prev_aen.members.locale & curr_aen.members.locale) ^
1882                       curr_aen.members.locale)) {
1883                         /*
1884                          * Previously issued event registration includes
1885                          * current request. Nothing to do.
1886                          */
1887                         return 0;
1888                 } else {
1889                         curr_aen.members.locale |= prev_aen.members.locale;
1890
1891                         if (prev_aen.members.class < curr_aen.members.class)
1892                                 curr_aen.members.class = prev_aen.members.class;
1893
1894                         instance->aen_cmd->abort_aen = 1;
1895                         ret_val = megasas_issue_blocked_abort_cmd(instance,
1896                                                                   instance->
1897                                                                   aen_cmd);
1898
1899                         if (ret_val) {
1900                                 printk(KERN_DEBUG "megasas: Failed to abort "
1901                                        "previous AEN command\n");
1902                                 return ret_val;
1903                         }
1904                 }
1905         }
1906
1907         cmd = megasas_get_cmd(instance);
1908
1909         if (!cmd)
1910                 return -ENOMEM;
1911
1912         dcmd = &cmd->frame->dcmd;
1913
1914         memset(instance->evt_detail, 0, sizeof(struct megasas_evt_detail));
1915
1916         /*
1917          * Prepare DCMD for aen registration
1918          */
1919         memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);
1920
1921         dcmd->cmd = MFI_CMD_DCMD;
1922         dcmd->cmd_status = 0x0;
1923         dcmd->sge_count = 1;
1924         dcmd->flags = MFI_FRAME_DIR_READ;
1925         dcmd->timeout = 0;
1926         dcmd->data_xfer_len = sizeof(struct megasas_evt_detail);
1927         dcmd->opcode = MR_DCMD_CTRL_EVENT_WAIT;
1928         dcmd->mbox.w[0] = seq_num;
1929         dcmd->mbox.w[1] = curr_aen.word;
1930         dcmd->sgl.sge32[0].phys_addr = (u32) instance->evt_detail_h;
1931         dcmd->sgl.sge32[0].length = sizeof(struct megasas_evt_detail);
1932
1933         /*
1934          * Store reference to the cmd used to register for AEN. When an
1935          * application wants us to register for AEN, we have to abort this
1936          * cmd and re-register with a new EVENT LOCALE supplied by that app
1937          */
1938         instance->aen_cmd = cmd;
1939
1940         /*
1941          * Issue the aen registration frame
1942          */
1943         writel(cmd->frame_phys_addr >> 3,
1944                &instance->reg_set->inbound_queue_port);
1945
1946         return 0;
1947 }
1948
1949 /**
1950  * megasas_start_aen -  Subscribes to AEN during driver load time
1951  * @instance:           Adapter soft state
1952  */
1953 static int megasas_start_aen(struct megasas_instance *instance)
1954 {
1955         struct megasas_evt_log_info eli;
1956         union megasas_evt_class_locale class_locale;
1957
1958         /*
1959          * Get the latest sequence number from FW
1960          */
1961         memset(&eli, 0, sizeof(eli));
1962
1963         if (megasas_get_seq_num(instance, &eli))
1964                 return -1;
1965
1966         /*
1967          * Register AEN with FW for latest sequence number plus 1
1968          */
1969         class_locale.members.reserved = 0;
1970         class_locale.members.locale = MR_EVT_LOCALE_ALL;
1971         class_locale.members.class = MR_EVT_CLASS_DEBUG;
1972
1973         return megasas_register_aen(instance, eli.newest_seq_num + 1,
1974                                     class_locale.word);
1975 }
1976
1977 /**
1978  * megasas_io_attach -  Attaches this driver to SCSI mid-layer
1979  * @instance:           Adapter soft state
1980  */
1981 static int megasas_io_attach(struct megasas_instance *instance)
1982 {
1983         struct Scsi_Host *host = instance->host;
1984
1985         /*
1986          * Export parameters required by SCSI mid-layer
1987          */
1988         host->irq = instance->pdev->irq;
1989         host->unique_id = instance->unique_id;
1990         host->can_queue = instance->max_fw_cmds - MEGASAS_INT_CMDS;
1991         host->this_id = instance->init_id;
1992         host->sg_tablesize = instance->max_num_sge;
1993         host->max_sectors = instance->max_sectors_per_req;
1994         host->cmd_per_lun = 128;
1995         host->max_channel = MEGASAS_MAX_CHANNELS - 1;
1996         host->max_id = MEGASAS_MAX_DEV_PER_CHANNEL;
1997         host->max_lun = MEGASAS_MAX_LUN;
1998
1999         /*
2000          * Notify the mid-layer about the new controller
2001          */
2002         if (scsi_add_host(host, &instance->pdev->dev)) {
2003                 printk(KERN_DEBUG "megasas: scsi_add_host failed\n");
2004                 return -ENODEV;
2005         }
2006
2007         /*
2008          * Trigger SCSI to scan our drives
2009          */
2010         scsi_scan_host(host);
2011         return 0;
2012 }
2013
2014 /**
2015  * megasas_probe_one -  PCI hotplug entry point
2016  * @pdev:               PCI device structure
2017  * @id:                 PCI ids of supported hotplugged adapter
2018  */
2019 static int __devinit
2020 megasas_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
2021 {
2022         int rval;
2023         struct Scsi_Host *host;
2024         struct megasas_instance *instance;
2025
2026         /*
2027          * Announce PCI information
2028          */
2029         printk(KERN_INFO "megasas: %#4.04x:%#4.04x:%#4.04x:%#4.04x: ",
2030                pdev->vendor, pdev->device, pdev->subsystem_vendor,
2031                pdev->subsystem_device);
2032
2033         printk("bus %d:slot %d:func %d\n",
2034                pdev->bus->number, PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
2035
2036         /*
2037          * PCI prepping: enable device set bus mastering and dma mask
2038          */
2039         rval = pci_enable_device(pdev);
2040
2041         if (rval) {
2042                 return rval;
2043         }
2044
2045         pci_set_master(pdev);
2046
2047         /*
2048          * All our contollers are capable of performing 64-bit DMA
2049          */
2050         if (IS_DMA64) {
2051                 if (pci_set_dma_mask(pdev, DMA_64BIT_MASK) != 0) {
2052
2053                         if (pci_set_dma_mask(pdev, DMA_32BIT_MASK) != 0)
2054                                 goto fail_set_dma_mask;
2055                 }
2056         } else {
2057                 if (pci_set_dma_mask(pdev, DMA_32BIT_MASK) != 0)
2058                         goto fail_set_dma_mask;
2059         }
2060
2061         host = scsi_host_alloc(&megasas_template,
2062                                sizeof(struct megasas_instance));
2063
2064         if (!host) {
2065                 printk(KERN_DEBUG "megasas: scsi_host_alloc failed\n");
2066                 goto fail_alloc_instance;
2067         }
2068
2069         instance = (struct megasas_instance *)host->hostdata;
2070         memset(instance, 0, sizeof(*instance));
2071
2072         instance->producer = pci_alloc_consistent(pdev, sizeof(u32),
2073                                                   &instance->producer_h);
2074         instance->consumer = pci_alloc_consistent(pdev, sizeof(u32),
2075                                                   &instance->consumer_h);
2076
2077         if (!instance->producer || !instance->consumer) {
2078                 printk(KERN_DEBUG "megasas: Failed to allocate memory for "
2079                        "producer, consumer\n");
2080                 goto fail_alloc_dma_buf;
2081         }
2082
2083         *instance->producer = 0;
2084         *instance->consumer = 0;
2085
2086         instance->evt_detail = pci_alloc_consistent(pdev,
2087                                                     sizeof(struct
2088                                                            megasas_evt_detail),
2089                                                     &instance->evt_detail_h);
2090
2091         if (!instance->evt_detail) {
2092                 printk(KERN_DEBUG "megasas: Failed to allocate memory for "
2093                        "event detail structure\n");
2094                 goto fail_alloc_dma_buf;
2095         }
2096
2097         /*
2098          * Initialize locks and queues
2099          */
2100         INIT_LIST_HEAD(&instance->cmd_pool);
2101
2102         init_waitqueue_head(&instance->int_cmd_wait_q);
2103         init_waitqueue_head(&instance->abort_cmd_wait_q);
2104
2105         spin_lock_init(&instance->cmd_pool_lock);
2106         spin_lock_init(&instance->instance_lock);
2107
2108         sema_init(&instance->aen_mutex, 1);
2109         sema_init(&instance->ioctl_sem, MEGASAS_INT_CMDS);
2110
2111         /*
2112          * Initialize PCI related and misc parameters
2113          */
2114         instance->pdev = pdev;
2115         instance->host = host;
2116         instance->unique_id = pdev->bus->number << 8 | pdev->devfn;
2117         instance->init_id = MEGASAS_DEFAULT_INIT_ID;
2118
2119         /*
2120          * Initialize MFI Firmware
2121          */
2122         if (megasas_init_mfi(instance))
2123                 goto fail_init_mfi;
2124
2125         /*
2126          * Register IRQ
2127          */
2128         if (request_irq(pdev->irq, megasas_isr, SA_SHIRQ, "megasas", instance)) {
2129                 printk(KERN_DEBUG "megasas: Failed to register IRQ\n");
2130                 goto fail_irq;
2131         }
2132
2133         megasas_enable_intr(instance->reg_set);
2134
2135         /*
2136          * Store instance in PCI softstate
2137          */
2138         pci_set_drvdata(pdev, instance);
2139
2140         /*
2141          * Add this controller to megasas_mgmt_info structure so that it
2142          * can be exported to management applications
2143          */
2144         megasas_mgmt_info.count++;
2145         megasas_mgmt_info.instance[megasas_mgmt_info.max_index] = instance;
2146         megasas_mgmt_info.max_index++;
2147
2148         /*
2149          * Initiate AEN (Asynchronous Event Notification)
2150          */
2151         if (megasas_start_aen(instance)) {
2152                 printk(KERN_DEBUG "megasas: start aen failed\n");
2153                 goto fail_start_aen;
2154         }
2155
2156         /*
2157          * Register with SCSI mid-layer
2158          */
2159         if (megasas_io_attach(instance))
2160                 goto fail_io_attach;
2161
2162         return 0;
2163
2164       fail_start_aen:
2165       fail_io_attach:
2166         megasas_mgmt_info.count--;
2167         megasas_mgmt_info.instance[megasas_mgmt_info.max_index] = NULL;
2168         megasas_mgmt_info.max_index--;
2169
2170         pci_set_drvdata(pdev, NULL);
2171         megasas_disable_intr(instance->reg_set);
2172         free_irq(instance->pdev->irq, instance);
2173
2174         megasas_release_mfi(instance);
2175
2176       fail_irq:
2177       fail_init_mfi:
2178       fail_alloc_dma_buf:
2179         if (instance->evt_detail)
2180                 pci_free_consistent(pdev, sizeof(struct megasas_evt_detail),
2181                                     instance->evt_detail,
2182                                     instance->evt_detail_h);
2183
2184         if (instance->producer)
2185                 pci_free_consistent(pdev, sizeof(u32), instance->producer,
2186                                     instance->producer_h);
2187         if (instance->consumer)
2188                 pci_free_consistent(pdev, sizeof(u32), instance->consumer,
2189                                     instance->consumer_h);
2190         scsi_host_put(host);
2191
2192       fail_alloc_instance:
2193       fail_set_dma_mask:
2194         pci_disable_device(pdev);
2195
2196         return -ENODEV;
2197 }
2198
2199 /**
2200  * megasas_flush_cache -        Requests FW to flush all its caches
2201  * @instance:                   Adapter soft state
2202  */
2203 static void megasas_flush_cache(struct megasas_instance *instance)
2204 {
2205         struct megasas_cmd *cmd;
2206         struct megasas_dcmd_frame *dcmd;
2207
2208         cmd = megasas_get_cmd(instance);
2209
2210         if (!cmd)
2211                 return;
2212
2213         dcmd = &cmd->frame->dcmd;
2214
2215         memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);
2216
2217         dcmd->cmd = MFI_CMD_DCMD;
2218         dcmd->cmd_status = 0x0;
2219         dcmd->sge_count = 0;
2220         dcmd->flags = MFI_FRAME_DIR_NONE;
2221         dcmd->timeout = 0;
2222         dcmd->data_xfer_len = 0;
2223         dcmd->opcode = MR_DCMD_CTRL_CACHE_FLUSH;
2224         dcmd->mbox.b[0] = MR_FLUSH_CTRL_CACHE | MR_FLUSH_DISK_CACHE;
2225
2226         megasas_issue_blocked_cmd(instance, cmd);
2227
2228         megasas_return_cmd(instance, cmd);
2229
2230         return;
2231 }
2232
2233 /**
2234  * megasas_shutdown_controller -        Instructs FW to shutdown the controller
2235  * @instance:                           Adapter soft state
2236  */
2237 static void megasas_shutdown_controller(struct megasas_instance *instance)
2238 {
2239         struct megasas_cmd *cmd;
2240         struct megasas_dcmd_frame *dcmd;
2241
2242         cmd = megasas_get_cmd(instance);
2243
2244         if (!cmd)
2245                 return;
2246
2247         if (instance->aen_cmd)
2248                 megasas_issue_blocked_abort_cmd(instance, instance->aen_cmd);
2249
2250         dcmd = &cmd->frame->dcmd;
2251
2252         memset(dcmd->mbox.b, 0, MFI_MBOX_SIZE);
2253
2254         dcmd->cmd = MFI_CMD_DCMD;
2255         dcmd->cmd_status = 0x0;
2256         dcmd->sge_count = 0;
2257         dcmd->flags = MFI_FRAME_DIR_NONE;
2258         dcmd->timeout = 0;
2259         dcmd->data_xfer_len = 0;
2260         dcmd->opcode = MR_DCMD_CTRL_SHUTDOWN;
2261
2262         megasas_issue_blocked_cmd(instance, cmd);
2263
2264         megasas_return_cmd(instance, cmd);
2265
2266         return;
2267 }
2268
2269 /**
2270  * megasas_detach_one - PCI hot"un"plug entry point
2271  * @pdev:               PCI device structure
2272  */
2273 static void megasas_detach_one(struct pci_dev *pdev)
2274 {
2275         int i;
2276         struct Scsi_Host *host;
2277         struct megasas_instance *instance;
2278
2279         instance = pci_get_drvdata(pdev);
2280         host = instance->host;
2281
2282         scsi_remove_host(instance->host);
2283         megasas_flush_cache(instance);
2284         megasas_shutdown_controller(instance);
2285
2286         /*
2287          * Take the instance off the instance array. Note that we will not
2288          * decrement the max_index. We let this array be sparse array
2289          */
2290         for (i = 0; i < megasas_mgmt_info.max_index; i++) {
2291                 if (megasas_mgmt_info.instance[i] == instance) {
2292                         megasas_mgmt_info.count--;
2293                         megasas_mgmt_info.instance[i] = NULL;
2294
2295                         break;
2296                 }
2297         }
2298
2299         pci_set_drvdata(instance->pdev, NULL);
2300
2301         megasas_disable_intr(instance->reg_set);
2302
2303         free_irq(instance->pdev->irq, instance);
2304
2305         megasas_release_mfi(instance);
2306
2307         pci_free_consistent(pdev, sizeof(struct megasas_evt_detail),
2308                             instance->evt_detail, instance->evt_detail_h);
2309
2310         pci_free_consistent(pdev, sizeof(u32), instance->producer,
2311                             instance->producer_h);
2312
2313         pci_free_consistent(pdev, sizeof(u32), instance->consumer,
2314                             instance->consumer_h);
2315
2316         scsi_host_put(host);
2317
2318         pci_set_drvdata(pdev, NULL);
2319
2320         pci_disable_device(pdev);
2321
2322         return;
2323 }
2324
2325 /**
2326  * megasas_shutdown -   Shutdown entry point
2327  * @device:             Generic device structure
2328  */
2329 static void megasas_shutdown(struct pci_dev *pdev)
2330 {
2331         struct megasas_instance *instance = pci_get_drvdata(pdev);
2332         megasas_flush_cache(instance);
2333 }
2334
2335 /**
2336  * megasas_mgmt_open -  char node "open" entry point
2337  */
2338 static int megasas_mgmt_open(struct inode *inode, struct file *filep)
2339 {
2340         /*
2341          * Allow only those users with admin rights
2342          */
2343         if (!capable(CAP_SYS_ADMIN))
2344                 return -EACCES;
2345
2346         return 0;
2347 }
2348
2349 /**
2350  * megasas_mgmt_release - char node "release" entry point
2351  */
2352 static int megasas_mgmt_release(struct inode *inode, struct file *filep)
2353 {
2354         filep->private_data = NULL;
2355         fasync_helper(-1, filep, 0, &megasas_async_queue);
2356
2357         return 0;
2358 }
2359
2360 /**
2361  * megasas_mgmt_fasync -        Async notifier registration from applications
2362  *
2363  * This function adds the calling process to a driver global queue. When an
2364  * event occurs, SIGIO will be sent to all processes in this queue.
2365  */
2366 static int megasas_mgmt_fasync(int fd, struct file *filep, int mode)
2367 {
2368         int rc;
2369
2370         down(&megasas_async_queue_mutex);
2371
2372         rc = fasync_helper(fd, filep, mode, &megasas_async_queue);
2373
2374         up(&megasas_async_queue_mutex);
2375
2376         if (rc >= 0) {
2377                 /* For sanity check when we get ioctl */
2378                 filep->private_data = filep;
2379                 return 0;
2380         }
2381
2382         printk(KERN_DEBUG "megasas: fasync_helper failed [%d]\n", rc);
2383
2384         return rc;
2385 }
2386
2387 /**
2388  * megasas_mgmt_fw_ioctl -      Issues management ioctls to FW
2389  * @instance:                   Adapter soft state
2390  * @argp:                       User's ioctl packet
2391  */
2392 static int
2393 megasas_mgmt_fw_ioctl(struct megasas_instance *instance,
2394                       struct megasas_iocpacket __user * user_ioc,
2395                       struct megasas_iocpacket *ioc)
2396 {
2397         struct megasas_sge32 *kern_sge32;
2398         struct megasas_cmd *cmd;
2399         void *kbuff_arr[MAX_IOCTL_SGE];
2400         dma_addr_t buf_handle = 0;
2401         int error = 0, i;
2402         void *sense = NULL;
2403         dma_addr_t sense_handle;
2404         u32 *sense_ptr;
2405
2406         memset(kbuff_arr, 0, sizeof(kbuff_arr));
2407
2408         if (ioc->sge_count > MAX_IOCTL_SGE) {
2409                 printk(KERN_DEBUG "megasas: SGE count [%d] >  max limit [%d]\n",
2410                        ioc->sge_count, MAX_IOCTL_SGE);
2411                 return -EINVAL;
2412         }
2413
2414         cmd = megasas_get_cmd(instance);
2415         if (!cmd) {
2416                 printk(KERN_DEBUG "megasas: Failed to get a cmd packet\n");
2417                 return -ENOMEM;
2418         }
2419
2420         /*
2421          * User's IOCTL packet has 2 frames (maximum). Copy those two
2422          * frames into our cmd's frames. cmd->frame's context will get
2423          * overwritten when we copy from user's frames. So set that value
2424          * alone separately
2425          */
2426         memcpy(cmd->frame, ioc->frame.raw, 2 * MEGAMFI_FRAME_SIZE);
2427         cmd->frame->hdr.context = cmd->index;
2428
2429         /*
2430          * The management interface between applications and the fw uses
2431          * MFI frames. E.g, RAID configuration changes, LD property changes
2432          * etc are accomplishes through different kinds of MFI frames. The
2433          * driver needs to care only about substituting user buffers with
2434          * kernel buffers in SGLs. The location of SGL is embedded in the
2435          * struct iocpacket itself.
2436          */
2437         kern_sge32 = (struct megasas_sge32 *)
2438             ((unsigned long)cmd->frame + ioc->sgl_off);
2439
2440         /*
2441          * For each user buffer, create a mirror buffer and copy in
2442          */
2443         for (i = 0; i < ioc->sge_count; i++) {
2444                 kbuff_arr[i] = pci_alloc_consistent(instance->pdev,
2445                                                     ioc->sgl[i].iov_len,
2446                                                     &buf_handle);
2447                 if (!kbuff_arr[i]) {
2448                         printk(KERN_DEBUG "megasas: Failed to alloc "
2449                                "kernel SGL buffer for IOCTL \n");
2450                         error = -ENOMEM;
2451                         goto out;
2452                 }
2453
2454                 /*
2455                  * We don't change the dma_coherent_mask, so
2456                  * pci_alloc_consistent only returns 32bit addresses
2457                  */
2458                 kern_sge32[i].phys_addr = (u32) buf_handle;
2459                 kern_sge32[i].length = ioc->sgl[i].iov_len;
2460
2461                 /*
2462                  * We created a kernel buffer corresponding to the
2463                  * user buffer. Now copy in from the user buffer
2464                  */
2465                 if (copy_from_user(kbuff_arr[i], ioc->sgl[i].iov_base,
2466                                    (u32) (ioc->sgl[i].iov_len))) {
2467                         error = -EFAULT;
2468                         goto out;
2469                 }
2470         }
2471
2472         if (ioc->sense_len) {
2473                 sense = pci_alloc_consistent(instance->pdev, ioc->sense_len,
2474                                              &sense_handle);
2475                 if (!sense) {
2476                         error = -ENOMEM;
2477                         goto out;
2478                 }
2479
2480                 sense_ptr =
2481                     (u32 *) ((unsigned long)cmd->frame + ioc->sense_off);
2482                 *sense_ptr = sense_handle;
2483         }
2484
2485         /*
2486          * Set the sync_cmd flag so that the ISR knows not to complete this
2487          * cmd to the SCSI mid-layer
2488          */
2489         cmd->sync_cmd = 1;
2490         megasas_issue_blocked_cmd(instance, cmd);
2491         cmd->sync_cmd = 0;
2492
2493         /*
2494          * copy out the kernel buffers to user buffers
2495          */
2496         for (i = 0; i < ioc->sge_count; i++) {
2497                 if (copy_to_user(ioc->sgl[i].iov_base, kbuff_arr[i],
2498                                  ioc->sgl[i].iov_len)) {
2499                         error = -EFAULT;
2500                         goto out;
2501                 }
2502         }
2503
2504         /*
2505          * copy out the sense
2506          */
2507         if (ioc->sense_len) {
2508                 /*
2509                  * sense_ptr points to the location that has the user
2510                  * sense buffer address
2511                  */
2512                 sense_ptr = (u32 *) ((unsigned long)ioc->frame.raw +
2513                                      ioc->sense_off);
2514
2515                 if (copy_to_user((void __user *)((unsigned long)(*sense_ptr)),
2516                                  sense, ioc->sense_len)) {
2517                         error = -EFAULT;
2518                         goto out;
2519                 }
2520         }
2521
2522         /*
2523          * copy the status codes returned by the fw
2524          */
2525         if (copy_to_user(&user_ioc->frame.hdr.cmd_status,
2526                          &cmd->frame->hdr.cmd_status, sizeof(u8))) {
2527                 printk(KERN_DEBUG "megasas: Error copying out cmd_status\n");
2528                 error = -EFAULT;
2529         }
2530
2531       out:
2532         if (sense) {
2533                 pci_free_consistent(instance->pdev, ioc->sense_len,
2534                                     sense, sense_handle);
2535         }
2536
2537         for (i = 0; i < ioc->sge_count && kbuff_arr[i]; i++) {
2538                 pci_free_consistent(instance->pdev,
2539                                     kern_sge32[i].length,
2540                                     kbuff_arr[i], kern_sge32[i].phys_addr);
2541         }
2542
2543         megasas_return_cmd(instance, cmd);
2544         return error;
2545 }
2546
2547 static struct megasas_instance *megasas_lookup_instance(u16 host_no)
2548 {
2549         int i;
2550
2551         for (i = 0; i < megasas_mgmt_info.max_index; i++) {
2552
2553                 if ((megasas_mgmt_info.instance[i]) &&
2554                     (megasas_mgmt_info.instance[i]->host->host_no == host_no))
2555                         return megasas_mgmt_info.instance[i];
2556         }
2557
2558         return NULL;
2559 }
2560
2561 static int megasas_mgmt_ioctl_fw(struct file *file, unsigned long arg)
2562 {
2563         struct megasas_iocpacket __user *user_ioc =
2564             (struct megasas_iocpacket __user *)arg;
2565         struct megasas_iocpacket *ioc;
2566         struct megasas_instance *instance;
2567         int error;
2568
2569         ioc = kmalloc(sizeof(*ioc), GFP_KERNEL);
2570         if (!ioc)
2571                 return -ENOMEM;
2572
2573         if (copy_from_user(ioc, user_ioc, sizeof(*ioc))) {
2574                 error = -EFAULT;
2575                 goto out_kfree_ioc;
2576         }
2577
2578         instance = megasas_lookup_instance(ioc->host_no);
2579         if (!instance) {
2580                 error = -ENODEV;
2581                 goto out_kfree_ioc;
2582         }
2583
2584         /*
2585          * We will allow only MEGASAS_INT_CMDS number of parallel ioctl cmds
2586          */
2587         if (down_interruptible(&instance->ioctl_sem)) {
2588                 error = -ERESTARTSYS;
2589                 goto out_kfree_ioc;
2590         }
2591         error = megasas_mgmt_fw_ioctl(instance, user_ioc, ioc);
2592         up(&instance->ioctl_sem);
2593
2594       out_kfree_ioc:
2595         kfree(ioc);
2596         return error;
2597 }
2598
2599 static int megasas_mgmt_ioctl_aen(struct file *file, unsigned long arg)
2600 {
2601         struct megasas_instance *instance;
2602         struct megasas_aen aen;
2603         int error;
2604
2605         if (file->private_data != file) {
2606                 printk(KERN_DEBUG "megasas: fasync_helper was not "
2607                        "called first\n");
2608                 return -EINVAL;
2609         }
2610
2611         if (copy_from_user(&aen, (void __user *)arg, sizeof(aen)))
2612                 return -EFAULT;
2613
2614         instance = megasas_lookup_instance(aen.host_no);
2615
2616         if (!instance)
2617                 return -ENODEV;
2618
2619         down(&instance->aen_mutex);
2620         error = megasas_register_aen(instance, aen.seq_num,
2621                                      aen.class_locale_word);
2622         up(&instance->aen_mutex);
2623         return error;
2624 }
2625
2626 /**
2627  * megasas_mgmt_ioctl - char node ioctl entry point
2628  */
2629 static long
2630 megasas_mgmt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2631 {
2632         switch (cmd) {
2633         case MEGASAS_IOC_FIRMWARE:
2634                 return megasas_mgmt_ioctl_fw(file, arg);
2635
2636         case MEGASAS_IOC_GET_AEN:
2637                 return megasas_mgmt_ioctl_aen(file, arg);
2638         }
2639
2640         return -ENOTTY;
2641 }
2642
2643 #ifdef CONFIG_COMPAT
2644 static int megasas_mgmt_compat_ioctl_fw(struct file *file, unsigned long arg)
2645 {
2646         struct compat_megasas_iocpacket __user *cioc =
2647             (struct compat_megasas_iocpacket __user *)arg;
2648         struct megasas_iocpacket __user *ioc =
2649             compat_alloc_user_space(sizeof(struct megasas_iocpacket));
2650         int i;
2651         int error = 0;
2652
2653         clear_user(ioc, sizeof(*ioc));
2654
2655         if (copy_in_user(&ioc->host_no, &cioc->host_no, sizeof(u16)) ||
2656             copy_in_user(&ioc->sgl_off, &cioc->sgl_off, sizeof(u32)) ||
2657             copy_in_user(&ioc->sense_off, &cioc->sense_off, sizeof(u32)) ||
2658             copy_in_user(&ioc->sense_len, &cioc->sense_len, sizeof(u32)) ||
2659             copy_in_user(ioc->frame.raw, cioc->frame.raw, 128) ||
2660             copy_in_user(&ioc->sge_count, &cioc->sge_count, sizeof(u32)))
2661                 return -EFAULT;
2662
2663         for (i = 0; i < MAX_IOCTL_SGE; i++) {
2664                 compat_uptr_t ptr;
2665
2666                 if (get_user(ptr, &cioc->sgl[i].iov_base) ||
2667                     put_user(compat_ptr(ptr), &ioc->sgl[i].iov_base) ||
2668                     copy_in_user(&ioc->sgl[i].iov_len,
2669                                  &cioc->sgl[i].iov_len, sizeof(compat_size_t)))
2670                         return -EFAULT;
2671         }
2672
2673         error = megasas_mgmt_ioctl_fw(file, (unsigned long)ioc);
2674
2675         if (copy_in_user(&cioc->frame.hdr.cmd_status,
2676                          &ioc->frame.hdr.cmd_status, sizeof(u8))) {
2677                 printk(KERN_DEBUG "megasas: error copy_in_user cmd_status\n");
2678                 return -EFAULT;
2679         }
2680         return error;
2681 }
2682
2683 static long
2684 megasas_mgmt_compat_ioctl(struct file *file, unsigned int cmd,
2685                           unsigned long arg)
2686 {
2687         switch (cmd) {
2688         case MEGASAS_IOC_FIRMWARE:{
2689                         return megasas_mgmt_compat_ioctl_fw(file, arg);
2690                 }
2691         case MEGASAS_IOC_GET_AEN:
2692                 return megasas_mgmt_ioctl_aen(file, arg);
2693         }
2694
2695         return -ENOTTY;
2696 }
2697 #endif
2698
2699 /*
2700  * File operations structure for management interface
2701  */
2702 static struct file_operations megasas_mgmt_fops = {
2703         .owner = THIS_MODULE,
2704         .open = megasas_mgmt_open,
2705         .release = megasas_mgmt_release,
2706         .fasync = megasas_mgmt_fasync,
2707         .unlocked_ioctl = megasas_mgmt_ioctl,
2708 #ifdef CONFIG_COMPAT
2709         .compat_ioctl = megasas_mgmt_compat_ioctl,
2710 #endif
2711 };
2712
2713 /*
2714  * PCI hotplug support registration structure
2715  */
2716 static struct pci_driver megasas_pci_driver = {
2717
2718         .name = "megaraid_sas",
2719         .id_table = megasas_pci_table,
2720         .probe = megasas_probe_one,
2721         .remove = __devexit_p(megasas_detach_one),
2722         .shutdown = megasas_shutdown,
2723 };
2724
2725 /*
2726  * Sysfs driver attributes
2727  */
2728 static ssize_t megasas_sysfs_show_version(struct device_driver *dd, char *buf)
2729 {
2730         return snprintf(buf, strlen(MEGASAS_VERSION) + 2, "%s\n",
2731                         MEGASAS_VERSION);
2732 }
2733
2734 static DRIVER_ATTR(version, S_IRUGO, megasas_sysfs_show_version, NULL);
2735
2736 static ssize_t
2737 megasas_sysfs_show_release_date(struct device_driver *dd, char *buf)
2738 {
2739         return snprintf(buf, strlen(MEGASAS_RELDATE) + 2, "%s\n",
2740                         MEGASAS_RELDATE);
2741 }
2742
2743 static DRIVER_ATTR(release_date, S_IRUGO, megasas_sysfs_show_release_date,
2744                    NULL);
2745
2746 /**
2747  * megasas_init - Driver load entry point
2748  */
2749 static int __init megasas_init(void)
2750 {
2751         int rval;
2752
2753         /*
2754          * Announce driver version and other information
2755          */
2756         printk(KERN_INFO "megasas: %s %s\n", MEGASAS_VERSION,
2757                MEGASAS_EXT_VERSION);
2758
2759         memset(&megasas_mgmt_info, 0, sizeof(megasas_mgmt_info));
2760
2761         /*
2762          * Register character device node
2763          */
2764         rval = register_chrdev(0, "megaraid_sas_ioctl", &megasas_mgmt_fops);
2765
2766         if (rval < 0) {
2767                 printk(KERN_DEBUG "megasas: failed to open device node\n");
2768                 return rval;
2769         }
2770
2771         megasas_mgmt_majorno = rval;
2772
2773         /*
2774          * Register ourselves as PCI hotplug module
2775          */
2776         rval = pci_module_init(&megasas_pci_driver);
2777
2778         if (rval) {
2779                 printk(KERN_DEBUG "megasas: PCI hotplug regisration failed \n");
2780                 unregister_chrdev(megasas_mgmt_majorno, "megaraid_sas_ioctl");
2781         }
2782
2783         driver_create_file(&megasas_pci_driver.driver, &driver_attr_version);
2784         driver_create_file(&megasas_pci_driver.driver,
2785                            &driver_attr_release_date);
2786
2787         return rval;
2788 }
2789
2790 /**
2791  * megasas_exit - Driver unload entry point
2792  */
2793 static void __exit megasas_exit(void)
2794 {
2795         driver_remove_file(&megasas_pci_driver.driver, &driver_attr_version);
2796         driver_remove_file(&megasas_pci_driver.driver,
2797                            &driver_attr_release_date);
2798
2799         pci_unregister_driver(&megasas_pci_driver);
2800         unregister_chrdev(megasas_mgmt_majorno, "megaraid_sas_ioctl");
2801 }
2802
2803 module_init(megasas_init);
2804 module_exit(megasas_exit);