drivers/block/mtip32xx/mtip32xx.h

   1 /*
   2  * mtip32xx.h - Header file for the P320 SSD Block Driver
   3  *   Copyright (C) 2011 Micron Technology, Inc.
   4  *
   5  * Portions of this code were derived from works subjected to the
   6  * following copyright:
   7  *    Copyright (C) 2009 Integrated Device Technology, Inc.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  */
  20
  21 #ifndef __MTIP32XX_H__
  22 #define __MTIP32XX_H__
  23
  24 #include <linux/spinlock.h>
  25 #include <linux/rwsem.h>
  26 #include <linux/ata.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/genhd.h>
  29
  30 /* Offset of Subsystem Device ID in pci confoguration space */
  31 #define PCI_SUBSYSTEM_DEVICEID  0x2E
  32
  33 /* offset of Device Control register in PCIe extended capabilites space */
  34 #define PCIE_CONFIG_EXT_DEVICE_CONTROL_OFFSET   0x48
  35
  36 /* check for erase mode support during secure erase */
  37 #define MTIP_SEC_ERASE_MODE     0x2
  38
  39 /* # of times to retry timed out/failed IOs */
  40 #define MTIP_MAX_RETRIES        2
  41
  42 /* Various timeout values in ms */
  43 #define MTIP_NCQ_COMMAND_TIMEOUT_MS       5000
  44 #define MTIP_IOCTL_COMMAND_TIMEOUT_MS     5000
  45 #define MTIP_INTERNAL_COMMAND_TIMEOUT_MS  5000
  46
  47 /* check for timeouts every 500ms */
  48 #define MTIP_TIMEOUT_CHECK_PERIOD       500
  49
  50 /* ftl rebuild */
  51 #define MTIP_FTL_REBUILD_OFFSET         142
  52 #define MTIP_FTL_REBUILD_MAGIC          0xED51
  53 #define MTIP_FTL_REBUILD_TIMEOUT_MS     2400000
  54
  55 /* unaligned IO handling */
  56 #define MTIP_MAX_UNALIGNED_SLOTS        8
  57
  58 /* Macro to extract the tag bit number from a tag value. */
  59 #define MTIP_TAG_BIT(tag)       (tag & 0x1F)
  60
  61 /*
  62  * Macro to extract the tag index from a tag value. The index
  63  * is used to access the correct s_active/Command Issue register based
  64  * on the tag value.
  65  */
  66 #define MTIP_TAG_INDEX(tag)     (tag >> 5)
  67
  68 /*
  69  * Maximum number of scatter gather entries
  70  * a single command may have.
  71  */
  72 #define MTIP_MAX_SG             128
  73
  74 /*
  75  * Maximum number of slot groups (Command Issue & s_active registers)
  76  * NOTE: This is the driver maximum; check dd->slot_groups for actual value.
  77  */
  78 #define MTIP_MAX_SLOT_GROUPS    8
  79
  80 /* Internal command tag. */
  81 #define MTIP_TAG_INTERNAL       0
  82
  83 /* Micron Vendor ID & P320x SSD Device ID */
  84 #define PCI_VENDOR_ID_MICRON    0x1344
  85 #define P320H_DEVICE_ID         0x5150
  86 #define P320M_DEVICE_ID         0x5151
  87 #define P320S_DEVICE_ID         0x5152
  88 #define P325M_DEVICE_ID         0x5153
  89 #define P420H_DEVICE_ID         0x5160
  90 #define P420M_DEVICE_ID         0x5161
  91 #define P425M_DEVICE_ID         0x5163
  92
  93 /* Driver name and version strings */
  94 #define MTIP_DRV_NAME           "mtip32xx"
  95 #define MTIP_DRV_VERSION        "1.2.6os3"
  96
  97 /* Maximum number of minor device numbers per device. */
  98 #define MTIP_MAX_MINORS         16
  99
 100 /* Maximum number of supported command slots. */
 101 #define MTIP_MAX_COMMAND_SLOTS  (MTIP_MAX_SLOT_GROUPS * 32)
 102
 103 /*
 104  * Per-tag bitfield size in longs.
 105  * Linux bit manipulation functions
 106  * (i.e. test_and_set_bit, find_next_zero_bit)
 107  * manipulate memory in longs, so we try to make the math work.
 108  * take the slot groups and find the number of longs, rounding up.
 109  * Careful! i386 and x86_64 use different size longs!
 110  */
 111 #define U32_PER_LONG    (sizeof(long) / sizeof(u32))
 112 #define SLOTBITS_IN_LONGS ((MTIP_MAX_SLOT_GROUPS + \
 113                                         (U32_PER_LONG-1))/U32_PER_LONG)
 114
 115 /* BAR number used to access the HBA registers. */
 116 #define MTIP_ABAR               5
 117
 118 #ifdef DEBUG
 119  #define dbg_printk(format, arg...)     \
 120         printk(pr_fmt(format), ##arg);
 121 #else
 122  #define dbg_printk(format, arg...)
 123 #endif
 124
 125 #define MTIP_DFS_MAX_BUF_SIZE 1024
 126
 127 #define __force_bit2int (unsigned int __force)
 128
 129 enum {
 130         /* below are bit numbers in 'flags' defined in mtip_port */
 131         MTIP_PF_IC_ACTIVE_BIT       = 0, /* pio/ioctl */
 132         MTIP_PF_EH_ACTIVE_BIT       = 1, /* error handling */
 133         MTIP_PF_SE_ACTIVE_BIT       = 2, /* secure erase */
 134         MTIP_PF_DM_ACTIVE_BIT       = 3, /* download microcde */
 135         MTIP_PF_PAUSE_IO      = ((1 << MTIP_PF_IC_ACTIVE_BIT) |
 136                                 (1 << MTIP_PF_EH_ACTIVE_BIT) |
 137                                 (1 << MTIP_PF_SE_ACTIVE_BIT) |
 138                                 (1 << MTIP_PF_DM_ACTIVE_BIT)),
 139
 140         MTIP_PF_SVC_THD_ACTIVE_BIT  = 4,
 141         MTIP_PF_ISSUE_CMDS_BIT      = 5,
 142         MTIP_PF_REBUILD_BIT         = 6,
 143         MTIP_PF_SVC_THD_STOP_BIT    = 8,
 144
 145         /* below are bit numbers in 'dd_flag' defined in driver_data */
 146         MTIP_DDF_SEC_LOCK_BIT       = 0,
 147         MTIP_DDF_REMOVE_PENDING_BIT = 1,
 148         MTIP_DDF_OVER_TEMP_BIT      = 2,
 149         MTIP_DDF_WRITE_PROTECT_BIT  = 3,
 150         MTIP_DDF_STOP_IO      = ((1 << MTIP_DDF_REMOVE_PENDING_BIT) |
 151                                 (1 << MTIP_DDF_SEC_LOCK_BIT) |
 152                                 (1 << MTIP_DDF_OVER_TEMP_BIT) |
 153                                 (1 << MTIP_DDF_WRITE_PROTECT_BIT)),
 154
 155         MTIP_DDF_CLEANUP_BIT        = 5,
 156         MTIP_DDF_RESUME_BIT         = 6,
 157         MTIP_DDF_INIT_DONE_BIT      = 7,
 158         MTIP_DDF_REBUILD_FAILED_BIT = 8,
 159 };
 160
 161 struct smart_attr {
 162         u8 attr_id;
 163         u16 flags;
 164         u8 cur;
 165         u8 worst;
 166         u32 data;
 167         u8 res[3];
 168 } __packed;
 169
 170 struct mtip_work {
 171         struct work_struct work;
 172         void *port;
 173         int cpu_binding;
 174         u32 completed;
 175 } ____cacheline_aligned_in_smp;
 176
 177 #define DEFINE_HANDLER(group)                                  \
 178         void mtip_workq_sdbf##group(struct work_struct *work)       \
 179         {                                                      \
 180                 struct mtip_work *w = (struct mtip_work *) work;         \
 181                 mtip_workq_sdbfx(w->port, group, w->completed);     \
 182         }
 183
 184 #define MTIP_TRIM_TIMEOUT_MS            240000
 185 #define MTIP_MAX_TRIM_ENTRIES           8
 186 #define MTIP_MAX_TRIM_ENTRY_LEN         0xfff8
 187
 188 struct mtip_trim_entry {
 189         u32 lba;   /* starting lba of region */
 190         u16 rsvd;  /* unused */
 191         u16 range; /* # of 512b blocks to trim */
 192 } __packed;
 193
 194 struct mtip_trim {
 195         /* Array of regions to trim */
 196         struct mtip_trim_entry entry[MTIP_MAX_TRIM_ENTRIES];
 197 } __packed;
 198
 199 /* Register Frame Information Structure (FIS), host to device. */
 200 struct host_to_dev_fis {
 201         /*
 202          * FIS type.
 203          * - 27h Register FIS, host to device.
 204          * - 34h Register FIS, device to host.
 205          * - 39h DMA Activate FIS, device to host.
 206          * - 41h DMA Setup FIS, bi-directional.
 207          * - 46h Data FIS, bi-directional.
 208          * - 58h BIST Activate FIS, bi-directional.
 209          * - 5Fh PIO Setup FIS, device to host.
 210          * - A1h Set Device Bits FIS, device to host.
 211          */
 212         unsigned char type;
 213         unsigned char opts;
 214         unsigned char command;
 215         unsigned char features;
 216
 217         union {
 218                 unsigned char lba_low;
 219                 unsigned char sector;
 220         };
 221         union {
 222                 unsigned char lba_mid;
 223                 unsigned char cyl_low;
 224         };
 225         union {
 226                 unsigned char lba_hi;
 227                 unsigned char cyl_hi;
 228         };
 229         union {
 230                 unsigned char device;
 231                 unsigned char head;
 232         };
 233
 234         union {
 235                 unsigned char lba_low_ex;
 236                 unsigned char sector_ex;
 237         };
 238         union {
 239                 unsigned char lba_mid_ex;
 240                 unsigned char cyl_low_ex;
 241         };
 242         union {
 243                 unsigned char lba_hi_ex;
 244                 unsigned char cyl_hi_ex;
 245         };
 246         unsigned char features_ex;
 247
 248         unsigned char sect_count;
 249         unsigned char sect_cnt_ex;
 250         unsigned char res2;
 251         unsigned char control;
 252
 253         unsigned int res3;
 254 };
 255
 256 /* Command header structure. */
 257 struct mtip_cmd_hdr {
 258         /*
 259          * Command options.
 260          * - Bits 31:16 Number of PRD entries.
 261          * - Bits 15:8 Unused in this implementation.
 262          * - Bit 7 Prefetch bit, informs the drive to prefetch PRD entries.
 263          * - Bit 6 Write bit, should be set when writing data to the device.
 264          * - Bit 5 Unused in this implementation.
 265          * - Bits 4:0 Length of the command FIS in DWords (DWord = 4 bytes).
 266          */
 267         unsigned int opts;
 268         /* This field is unsed when using NCQ. */
 269         union {
 270                 unsigned int byte_count;
 271                 unsigned int status;
 272         };
 273         /*
 274          * Lower 32 bits of the command table address associated with this
 275          * header. The command table addresses must be 128 byte aligned.
 276          */
 277         unsigned int ctba;
 278         /*
 279          * If 64 bit addressing is used this field is the upper 32 bits
 280          * of the command table address associated with this command.
 281          */
 282         unsigned int ctbau;
 283         /* Reserved and unused. */
 284         unsigned int res[4];
 285 };
 286
 287 /* Command scatter gather structure (PRD). */
 288 struct mtip_cmd_sg {
 289         /*
 290          * Low 32 bits of the data buffer address. For P320 this
 291          * address must be 8 byte aligned signified by bits 2:0 being
 292          * set to 0.
 293          */
 294         unsigned int dba;
 295         /*
 296          * When 64 bit addressing is used this field is the upper
 297          * 32 bits of the data buffer address.
 298          */
 299         unsigned int dba_upper;
 300         /* Unused. */
 301         unsigned int reserved;
 302         /*
 303          * Bit 31: interrupt when this data block has been transferred.
 304          * Bits 30..22: reserved
 305          * Bits 21..0: byte count (minus 1).  For P320 the byte count must be
 306          * 8 byte aligned signified by bits 2:0 being set to 1.
 307          */
 308         unsigned int info;
 309 };
 310 struct mtip_port;
 311
 312 /* Structure used to describe a command. */
 313 struct mtip_cmd {
 314
 315         struct mtip_cmd_hdr *command_header; /* ptr to command header entry */
 316
 317         dma_addr_t command_header_dma; /* corresponding physical address */
 318
 319         void *command; /* ptr to command table entry */
 320
 321         dma_addr_t command_dma; /* corresponding physical address */
 322
 323         void *comp_data; /* data passed to completion function comp_func() */
 324         /*
 325          * Completion function called by the ISR upon completion of
 326          * a command.
 327          */
 328         void (*comp_func)(struct mtip_port *port,
 329                                 int tag,
 330                                 void *data,
 331                                 int status);
 332         /* Additional callback function that may be called by comp_func() */
 333         void (*async_callback)(void *data, int status);
 334
 335         void *async_data; /* Addl. data passed to async_callback() */
 336
 337         int scatter_ents; /* Number of scatter list entries used */
 338
 339         int unaligned; /* command is unaligned on 4k boundary */
 340
 341         struct scatterlist sg[MTIP_MAX_SG]; /* Scatter list entries */
 342
 343         int retries; /* The number of retries left for this command. */
 344
 345         int direction; /* Data transfer direction */
 346
 347         unsigned long comp_time; /* command completion time, in jiffies */
 348
 349         atomic_t active; /* declares if this command sent to the drive. */
 350 };
 351
 352 /* Structure used to describe a port. */
 353 struct mtip_port {
 354         /* Pointer back to the driver data for this port. */
 355         struct driver_data *dd;
 356         /*
 357          * Used to determine if the data pointed to by the
 358          * identify field is valid.
 359          */
 360         unsigned long identify_valid;
 361         /* Base address of the memory mapped IO for the port. */
 362         void __iomem *mmio;
 363         /* Array of pointers to the memory mapped s_active registers. */
 364         void __iomem *s_active[MTIP_MAX_SLOT_GROUPS];
 365         /* Array of pointers to the memory mapped completed registers. */
 366         void __iomem *completed[MTIP_MAX_SLOT_GROUPS];
 367         /* Array of pointers to the memory mapped Command Issue registers. */
 368         void __iomem *cmd_issue[MTIP_MAX_SLOT_GROUPS];
 369         /*
 370          * Pointer to the beginning of the command header memory as used
 371          * by the driver.
 372          */
 373         void *command_list;
 374         /*
 375          * Pointer to the beginning of the command header memory as used
 376          * by the DMA.
 377          */
 378         dma_addr_t command_list_dma;
 379         /*
 380          * Pointer to the beginning of the RX FIS memory as used
 381          * by the driver.
 382          */
 383         void *rxfis;
 384         /*
 385          * Pointer to the beginning of the RX FIS memory as used
 386          * by the DMA.
 387          */
 388         dma_addr_t rxfis_dma;
 389         /*
 390          * Pointer to the beginning of the command table memory as used
 391          * by the driver.
 392          */
 393         void *command_table;
 394         /*
 395          * Pointer to the beginning of the command table memory as used
 396          * by the DMA.
 397          */
 398         dma_addr_t command_tbl_dma;
 399         /*
 400          * Pointer to the beginning of the identify data memory as used
 401          * by the driver.
 402          */
 403         u16 *identify;
 404         /*
 405          * Pointer to the beginning of the identify data memory as used
 406          * by the DMA.
 407          */
 408         dma_addr_t identify_dma;
 409         /*
 410          * Pointer to the beginning of a sector buffer that is used
 411          * by the driver when issuing internal commands.
 412          */
 413         u16 *sector_buffer;
 414         /*
 415          * Pointer to the beginning of a sector buffer that is used
 416          * by the DMA when the driver issues internal commands.
 417          */
 418         dma_addr_t sector_buffer_dma;
 419         /*
 420          * Bit significant, used to determine if a command slot has
 421          * been allocated. i.e. the slot is in use.  Bits are cleared
 422          * when the command slot and all associated data structures
 423          * are no longer needed.
 424          */
 425         u16 *log_buf;
 426         dma_addr_t log_buf_dma;
 427
 428         u8 *smart_buf;
 429         dma_addr_t smart_buf_dma;
 430
 431         unsigned long allocated[SLOTBITS_IN_LONGS];
 432         /*
 433          * used to queue commands when an internal command is in progress
 434          * or error handling is active
 435          */
 436         unsigned long cmds_to_issue[SLOTBITS_IN_LONGS];
 437         /*
 438          * Array of command slots. Structure includes pointers to the
 439          * command header and command table, and completion function and data
 440          * pointers.
 441          */
 442         struct mtip_cmd commands[MTIP_MAX_COMMAND_SLOTS];
 443         /* Used by mtip_service_thread to wait for an event */
 444         wait_queue_head_t svc_wait;
 445         /*
 446          * indicates the state of the port. Also, helps the service thread
 447          * to determine its action on wake up.
 448          */
 449         unsigned long flags;
 450         /*
 451          * Timer used to complete commands that have been active for too long.
 452          */
 453         struct timer_list cmd_timer;
 454         unsigned long ic_pause_timer;
 455         /*
 456          * Semaphore used to block threads if there are no
 457          * command slots available.
 458          */
 459         struct semaphore cmd_slot;
 460
 461         /* Semaphore to control queue depth of unaligned IOs */
 462         struct semaphore cmd_slot_unal;
 463
 464         /* Spinlock for working around command-issue bug. */
 465         spinlock_t cmd_issue_lock[MTIP_MAX_SLOT_GROUPS];
 466 };
 467
 468 /*
 469  * Driver private data structure.
 470  *
 471  * One structure is allocated per probed device.
 472  */
 473 struct driver_data {
 474         void __iomem *mmio; /* Base address of the HBA registers. */
 475
 476         int major; /* Major device number. */
 477
 478         int instance; /* Instance number. First device probed is 0, ... */
 479
 480         struct gendisk *disk; /* Pointer to our gendisk structure. */
 481
 482         struct pci_dev *pdev; /* Pointer to the PCI device structure. */
 483
 484         struct request_queue *queue; /* Our request queue. */
 485
 486         struct mtip_port *port; /* Pointer to the port data structure. */
 487
 488         unsigned product_type; /* magic value declaring the product type */
 489
 490         unsigned slot_groups; /* number of slot groups the product supports */
 491
 492         unsigned long index; /* Index to determine the disk name */
 493
 494         unsigned long dd_flag; /* NOTE: use atomic bit operations on this */
 495
 496         struct task_struct *mtip_svc_handler; /* task_struct of svc thd */
 497
 498         struct dentry *dfs_node;
 499
 500         bool trim_supp; /* flag indicating trim support */
 501
 502         int numa_node; /* NUMA support */
 503
 504         char workq_name[32];
 505
 506         struct workqueue_struct *isr_workq;
 507
 508         struct mtip_work work[MTIP_MAX_SLOT_GROUPS];
 509
 510         atomic_t irq_workers_active;
 511
 512         int isr_binding;
 513
 514         int unal_qdepth; /* qdepth of unaligned IO queue */
 515
 516         struct list_head online_list; /* linkage for online list */
 517
 518         struct list_head remove_list; /* linkage for removing list */
 519 };
 520
 521 #endif