drivers/scsi/megaraid/mega_common.h

   1 /*
   2  *
   3  *                      Linux MegaRAID device driver
   4  *
   5  * Copyright (c) 2003-2004  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         : mega_common.h
  13  *
  14  * Libaray of common routine used by all low-level megaraid drivers
  15  */
  16
  17 #ifndef _MEGA_COMMON_H_
  18 #define _MEGA_COMMON_H_
  19
  20 #include <linux/kernel.h>
  21 #include <linux/types.h>
  22 #include <linux/pci.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/delay.h>
  26 #include <linux/blkdev.h>
  27 #include <linux/list.h>
  28 #include <linux/version.h>
  29 #include <linux/moduleparam.h>
  30 #include <linux/dma-mapping.h>
  31 #include <asm/semaphore.h>
  32 #include <scsi/scsi.h>
  33 #include <scsi/scsi_cmnd.h>
  34 #include <scsi/scsi_device.h>
  35 #include <scsi/scsi_host.h>
  36
  37
  38 #define LSI_MAX_CHANNELS                16
  39 #define LSI_MAX_LOGICAL_DRIVES_64LD     (64+1)
  40
  41
  42 /**
  43  * scb_t - scsi command control block
  44  * @param ccb           : command control block for individual driver
  45  * @param list          : list of control blocks
  46  * @param gp            : general purpose field for LLDs
  47  * @param sno           : all SCBs have a serial number
  48  * @param scp           : associated scsi command
  49  * @param state         : current state of scb
  50  * @param dma_dir       : direction of data transfer
  51  * @param dma_type      : transfer with sg list, buffer, or no data transfer
  52  * @param dev_channel   : actual channel on the device
  53  * @param dev_target    : actual target on the device
  54  * @param status        : completion status
  55  *
  56  * This is our central data structure to issue commands the each driver.
  57  * Driver specific data structures are maintained in the ccb field.
  58  * scb provides a field 'gp', which can be used by LLD for its own purposes
  59  *
  60  * dev_channel and dev_target must be initialized with the actual channel and
  61  * target on the controller.
  62  */
  63 typedef struct {
  64         caddr_t                 ccb;
  65         struct list_head        list;
  66         unsigned long           gp;
  67         unsigned int            sno;
  68         struct scsi_cmnd        *scp;
  69         uint32_t                state;
  70         uint32_t                dma_direction;
  71         uint32_t                dma_type;
  72         uint16_t                dev_channel;
  73         uint16_t                dev_target;
  74         uint32_t                status;
  75 } scb_t;
  76
  77 /*
  78  * SCB states as it transitions from one state to another
  79  */
  80 #define SCB_FREE        0x0000  /* on the free list */
  81 #define SCB_ACTIVE      0x0001  /* off the free list */
  82 #define SCB_PENDQ       0x0002  /* on the pending queue */
  83 #define SCB_ISSUED      0x0004  /* issued - owner f/w */
  84 #define SCB_ABORT       0x0008  /* Got an abort for this one */
  85 #define SCB_RESET       0x0010  /* Got a reset for this one */
  86
  87 /*
  88  * DMA types for scb
  89  */
  90 #define MRAID_DMA_NONE  0x0000  /* no data transfer for this command */
  91 #define MRAID_DMA_WSG   0x0001  /* data transfer using a sg list */
  92 #define MRAID_DMA_WBUF  0x0002  /* data transfer using a contiguous buffer */
  93
  94
  95 /**
  96  * struct adapter_t - driver's initialization structure
  97  * @param dpc_h                 : tasklet handle
  98  * @param pdev                  : pci configuration pointer for kernel
  99  * @param host                  : pointer to host structure of mid-layer
 100  * @param host_lock             : pointer to appropriate lock
 101  * @param lock                  : synchronization lock for mid-layer and driver
 102  * @param quiescent             : driver is quiescent for now.
 103  * @param outstanding_cmds      : number of commands pending in the driver
 104  * @param kscb_list             : pointer to the bulk of SCBs pointers for IO
 105  * @param kscb_pool             : pool of free scbs for IO
 106  * @param kscb_pool_lock        : lock for pool of free scbs
 107  * @param pend_list             : pending commands list
 108  * @param pend_list_lock        : exlusion lock for pending commands list
 109  * @param completed_list        : list of completed commands
 110  * @param completed_list_lock   : exclusion lock for list of completed commands
 111  * @param sglen                 : max sg elements supported
 112  * @param device_ids            : to convert kernel device addr to our devices.
 113  * @param raid_device           : raid adapter specific pointer
 114  * @param max_channel           : maximum channel number supported - inclusive
 115  * @param max_target            : max target supported - inclusive
 116  * @param max_lun               : max lun supported - inclusive
 117  * @param unique_id             : unique identifier for each adapter
 118  * @param irq                   : IRQ for this adapter
 119  * @param ito                   : internal timeout value, (-1) means no timeout
 120  * @param ibuf                  : buffer to issue internal commands
 121  * @param ibuf_dma_h            : dma handle for the above buffer
 122  * @param uscb_list             : SCB pointers for user cmds, common mgmt module
 123  * @param uscb_pool             : pool of SCBs for user commands
 124  * @param uscb_pool_lock        : exclusion lock for these SCBs
 125  * @param max_cmds              : max outstanding commands
 126  * @param fw_version            : firmware version
 127  * @param bios_version          : bios version
 128  * @param max_cdb_sz            : biggest CDB size supported.
 129  * @param ha                    : is high availability present - clustering
 130  * @param init_id               : initiator ID, the default value should be 7
 131  * @param max_sectors           : max sectors per request
 132  * @param cmd_per_lun           : max outstanding commands per LUN
 133  * @param being_detached        : set when unloading, no more mgmt calls
 134  *
 135  *
 136  * mraid_setup_device_map() can be called anytime after the device map is
 137  * available and MRAID_GET_DEVICE_MAP() can be called whenever the mapping is
 138  * required, usually from LLD's queue entry point. The formar API sets up the
 139  * MRAID_IS_LOGICAL(adapter_t *, struct scsi_cmnd *) to find out if the
 140  * device in question is a logical drive.
 141  *
 142  * quiescent flag should be set by the driver if it is not accepting more
 143  * commands
 144  *
 145  * NOTE: The fields of this structures are placed to minimize cache misses
 146  */
 147
 148 // amount of space required to store the bios and firmware version strings
 149 #define VERSION_SIZE    16
 150
 151 typedef struct {
 152         struct tasklet_struct   dpc_h;
 153         struct pci_dev          *pdev;
 154         struct Scsi_Host        *host;
 155         spinlock_t              *host_lock;
 156         spinlock_t              lock;
 157         uint8_t                 quiescent;
 158         int                     outstanding_cmds;
 159         scb_t                   *kscb_list;
 160         struct list_head        kscb_pool;
 161         spinlock_t              kscb_pool_lock;
 162         struct list_head        pend_list;
 163         spinlock_t              pend_list_lock;
 164         struct list_head        completed_list;
 165         spinlock_t              completed_list_lock;
 166         uint16_t                sglen;
 167         int                     device_ids[LSI_MAX_CHANNELS]
 168                                         [LSI_MAX_LOGICAL_DRIVES_64LD];
 169         caddr_t                 raid_device;
 170         uint8_t                 max_channel;
 171         uint16_t                max_target;
 172         uint8_t                 max_lun;
 173
 174         uint32_t                unique_id;
 175         uint8_t                 irq;
 176         uint8_t                 ito;
 177         caddr_t                 ibuf;
 178         dma_addr_t              ibuf_dma_h;
 179         scb_t                   *uscb_list;
 180         struct list_head        uscb_pool;
 181         spinlock_t              uscb_pool_lock;
 182         int                     max_cmds;
 183         uint8_t                 fw_version[VERSION_SIZE];
 184         uint8_t                 bios_version[VERSION_SIZE];
 185         uint8_t                 max_cdb_sz;
 186         uint8_t                 ha;
 187         uint16_t                init_id;
 188         uint16_t                max_sectors;
 189         uint16_t                cmd_per_lun;
 190         atomic_t                being_detached;
 191 } adapter_t;
 192
 193 #define SCSI_FREE_LIST_LOCK(adapter)    (&adapter->kscb_pool_lock)
 194 #define USER_FREE_LIST_LOCK(adapter)    (&adapter->uscb_pool_lock)
 195 #define PENDING_LIST_LOCK(adapter)      (&adapter->pend_list_lock)
 196 #define COMPLETED_LIST_LOCK(adapter)    (&adapter->completed_list_lock)
 197
 198
 199 // conversion from scsi command
 200 #define SCP2HOST(scp)                   (scp)->device->host     // to host
 201 #define SCP2HOSTDATA(scp)               SCP2HOST(scp)->hostdata // to soft state
 202 #define SCP2CHANNEL(scp)                (scp)->device->channel  // to channel
 203 #define SCP2TARGET(scp)                 (scp)->device->id       // to target
 204 #define SCP2LUN(scp)                    (scp)->device->lun      // to LUN
 205
 206 // generic macro to convert scsi command and host to controller's soft state
 207 #define SCSIHOST2ADAP(host)     (((caddr_t *)(host->hostdata))[0])
 208 #define SCP2ADAPTER(scp)        (adapter_t *)SCSIHOST2ADAP(SCP2HOST(scp))
 209
 210
 211 /**
 212  * MRAID_GET_DEVICE_MAP - device ids
 213  * @param adp           - Adapter's soft state
 214  * @param scp           - mid-layer scsi command pointer
 215  * @param p_chan        - physical channel on the controller
 216  * @param target        - target id of the device or logical drive number
 217  * @param islogical     - set if the command is for the logical drive
 218  *
 219  * Macro to retrieve information about device class, logical or physical and
 220  * the corresponding physical channel and target or logical drive number
 221  **/
 222 #define MRAID_IS_LOGICAL(adp, scp)      \
 223         (SCP2CHANNEL(scp) == (adp)->max_channel) ? 1 : 0
 224
 225 #define MRAID_IS_LOGICAL_SDEV(adp, sdev)        \
 226         (sdev->channel == (adp)->max_channel) ? 1 : 0
 227
 228 #define MRAID_GET_DEVICE_MAP(adp, scp, p_chan, target, islogical)       \
 229         /*                                                              \
 230          * Is the request coming for the virtual channel                \
 231          */                                                             \
 232         islogical = MRAID_IS_LOGICAL(adp, scp);                         \
 233                                                                         \
 234         /*                                                              \
 235          * Get an index into our table of drive ids mapping             \
 236          */                                                             \
 237         if (islogical) {                                                \
 238                 p_chan = 0xFF;                                          \
 239                 target =                                                \
 240                 (adp)->device_ids[(adp)->max_channel][SCP2TARGET(scp)]; \
 241         }                                                               \
 242         else {                                                          \
 243                 p_chan = ((adp)->device_ids[SCP2CHANNEL(scp)]           \
 244                                         [SCP2TARGET(scp)] >> 8) & 0xFF; \
 245                 target = ((adp)->device_ids[SCP2CHANNEL(scp)]           \
 246                                         [SCP2TARGET(scp)] & 0xFF);      \
 247         }
 248
 249 /*
 250  * ### Helper routines ###
 251  */
 252 #define LSI_DBGLVL mraid_debug_level    // each LLD must define a global
 253                                         // mraid_debug_level
 254
 255 #ifdef DEBUG
 256 #if defined (_ASSERT_PANIC)
 257 #define ASSERT_ACTION   panic
 258 #else
 259 #define ASSERT_ACTION   printk
 260 #endif
 261
 262 #define ASSERT(expression)                                              \
 263         if (!(expression)) {                                            \
 264         ASSERT_ACTION("assertion failed:(%s), file: %s, line: %d:%s\n", \
 265                         #expression, __FILE__, __LINE__, __FUNCTION__); \
 266         }
 267 #else
 268 #define ASSERT(expression)
 269 #endif
 270
 271 /*
 272  * struct mraid_pci_blk - structure holds DMA memory block info
 273  * @param vaddr         : virtual address to a memory block
 274  * @param dma_addr      : DMA handle to a memory block
 275  *
 276  * This structure is filled up for the caller. It is the responsibilty of the
 277  * caller to allocate this array big enough to store addresses for all
 278  * requested elements
 279  */
 280 struct mraid_pci_blk {
 281         caddr_t         vaddr;
 282         dma_addr_t      dma_addr;
 283 };
 284
 285 #endif // _MEGA_COMMON_H_
 286
 287 // vim: set ts=8 sw=8 tw=78: