URL https://opencores.org/ocsvn/or1k/or1k/trunk
Subversion Repositories or1k

[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [scsi/] [scsi_debug.c] - Blame information for rev 1765

Details | Compare with Previous | View Log

/*
 *  linux/kernel/scsi_debug.c
 *
 *  Copyright (C) 1992  Eric Youngdale
 *  Simulate a host adapter with 2 disks attached.  Do a lot of checking
 *  to make sure that we are not getting blocks mixed up, and PANIC if
 *  anything out of the ordinary is seen.
 *
 *  This version is more generic, simulating a variable number of disk
 *  (or disk like devices) sharing a common amount of RAM (default 8 MB
 *  but can be set at driver/module load time).
 *
 *  For documentation see http://www.torque.net/sg/sdebug.html
 *
 *   D. Gilbert (dpg) work for Magneto-Optical device test [20010421]
 *   dpg: work for devfs large number of disks [20010809]
 *        use vmalloc() more inquiry+mode_sense [20020302]
 *        add timers for delayed responses [20020721]
 */
 
#include <linux/config.h>
#include <linux/module.h>
 
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/timer.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/genhd.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/smp_lock.h>
#include <linux/vmalloc.h>
 
#include <asm/io.h>
 
#include <linux/blk.h>
#include "scsi.h"
#include "hosts.h"
 
#include <linux/stat.h>
 
#ifndef LINUX_VERSION_CODE
#include <linux/version.h>
#endif
 
#include "scsi_debug.h"
 
static const char * scsi_debug_version_str = "Version: 0.61 (20020815)";
 
 
#ifndef SCSI_CMD_READ_16
#define SCSI_CMD_READ_16 0x88
#endif
#ifndef SCSI_CMD_WRITE_16
#define SCSI_CMD_WRITE_16 0x8a
#endif
#ifndef REPORT_LUNS
#define REPORT_LUNS 0xa0
#endif
 
/* A few options that we want selected */
#define DEF_NR_FAKE_DEVS   1
#define DEF_DEV_SIZE_MB   8
#define DEF_FAKE_BLK0   0
#define DEF_EVERY_NTH   100
#define DEF_DELAY   1
 
#define DEF_OPTS   0
#define SCSI_DEBUG_OPT_NOISE   1
#define SCSI_DEBUG_OPT_MEDIUM_ERR   2
#define SCSI_DEBUG_OPT_EVERY_NTH   4
 
#define OPT_MEDIUM_ERR_ADDR   0x1234
 
static int scsi_debug_num_devs = DEF_NR_FAKE_DEVS;
static int scsi_debug_opts = DEF_OPTS;
static int scsi_debug_every_nth = DEF_EVERY_NTH;
static int scsi_debug_cmnd_count = 0;
static int scsi_debug_delay = DEF_DELAY;
 
#define NR_HOSTS_PRESENT (((scsi_debug_num_devs - 1) / 7) + 1)
#define N_HEAD          8
#define N_SECTOR        32
#define DEV_READONLY(TGT)      (0)
#define DEV_REMOVEABLE(TGT)    (0)
#define PERIPH_DEVICE_TYPE(TGT) (TYPE_DISK);
 
static int scsi_debug_dev_size_mb = DEF_DEV_SIZE_MB;
#define STORE_SIZE (scsi_debug_dev_size_mb * 1024 * 1024)
 
/* default sector size is 512 bytes, 2**9 bytes */
#define POW2_SECT_SIZE 9
#define SECT_SIZE (1 << POW2_SECT_SIZE)
 
#define N_CYLINDER (STORE_SIZE / (SECT_SIZE * N_SECTOR * N_HEAD))
 
/* Time to wait before completing a command */
#define CAPACITY (N_HEAD * N_SECTOR * N_CYLINDER)
#define SECT_SIZE_PER(TGT) SECT_SIZE
 
 
#define SDEBUG_SENSE_LEN 32
 
struct sdebug_dev_info {
        Scsi_Device * sdp;
        unsigned char sense_buff[SDEBUG_SENSE_LEN];     /* weak nexus */
        char reset;
};
static struct sdebug_dev_info * devInfop;
 
typedef void (* done_funct_t) (Scsi_Cmnd *);
 
struct sdebug_queued_cmd {
        int in_use;
        struct timer_list cmnd_timer;
        done_funct_t done_funct;
        struct scsi_cmnd * a_cmnd;
        int scsi_result;
};
static struct sdebug_queued_cmd queued_arr[SCSI_DEBUG_CANQUEUE];
 
static unsigned char * fake_storep;     /* ramdisk storage */
 
static unsigned char broken_buff[SDEBUG_SENSE_LEN];
 
static int num_aborts = 0;
static int num_dev_resets = 0;
static int num_bus_resets = 0;
static int num_host_resets = 0;
 
static spinlock_t queued_arr_lock = SPIN_LOCK_UNLOCKED;
static rwlock_t atomic_rw = RW_LOCK_UNLOCKED;
 
 
/* function declarations */
static int resp_inquiry(unsigned char * cmd, int target, unsigned char * buff,
                        int bufflen, struct sdebug_dev_info * devip);
static int resp_mode_sense(unsigned char * cmd, int target,
                           unsigned char * buff, int bufflen,
                           struct sdebug_dev_info * devip);
static int resp_read(Scsi_Cmnd * SCpnt, int upper_blk, int block,
                     int num, struct sdebug_dev_info * devip);
static int resp_write(Scsi_Cmnd * SCpnt, int upper_blk, int block, int num,
                      struct sdebug_dev_info * devip);
static int resp_report_luns(unsigned char * cmd, unsigned char * buff,
                            int bufflen, struct sdebug_dev_info * devip);
static void timer_intr_handler(unsigned long);
static struct sdebug_dev_info * devInfoReg(Scsi_Device * sdp);
static void mk_sense_buffer(struct sdebug_dev_info * devip, int key,
                            int asc, int asq, int inbandLen);
static int check_reset(Scsi_Cmnd * SCpnt, struct sdebug_dev_info * devip);
static int schedule_resp(struct scsi_cmnd * cmnd,
                         struct sdebug_dev_info * devip,
                         done_funct_t done, int scsi_result, int delta_jiff);
static void init_all_queued(void);
static void stop_all_queued(void);
static int stop_queued_cmnd(struct scsi_cmnd * cmnd);
static int inquiry_evpd_83(unsigned char * arr, int dev_id_num,
                           const char * dev_id_str, int dev_id_str_len);
 
 
static Scsi_Host_Template driver_template = SCSI_DEBUG_TEMPLATE;
 
 
static
int scsi_debug_queuecommand(Scsi_Cmnd * SCpnt, done_funct_t done)
{
        unsigned char *cmd = (unsigned char *) SCpnt->cmnd;
        int block;
        int upper_blk;
        unsigned char *buff;
        int errsts = 0;
        int target = SCpnt->target;
        int bufflen = SCpnt->request_bufflen;
        int num, capac;
        struct sdebug_dev_info * devip = NULL;
        unsigned char * sbuff;
 
        if (done == NULL)
                return 0;        /* assume mid level reprocessing command */
 
        if (SCpnt->use_sg) { /* just use first element */
                struct scatterlist *sgpnt = (struct scatterlist *)
                                                SCpnt->request_buffer;
 
                buff = sgpnt[0].address;
                bufflen = sgpnt[0].length;
                /* READ and WRITE process scatterlist themselves */
        }
        else
                buff = (unsigned char *) SCpnt->request_buffer;
        if (NULL == buff) {
                printk(KERN_WARNING "scsi_debug:qc: buff was NULL??\n");
                buff = broken_buff;     /* just point at dummy */
                bufflen = SDEBUG_SENSE_LEN;
        }
 
        if(target == driver_template.this_id) {
                printk(KERN_WARNING
                       "scsi_debug: initiator's id used as target!\n");
                return schedule_resp(SCpnt, NULL, done, 0, 0);
        }
 
        if ((target > driver_template.this_id) || (SCpnt->lun != 0))
                return schedule_resp(SCpnt, NULL, done,
                                     DID_NO_CONNECT << 16, 0);
#if 0
        printk(KERN_INFO "sdebug:qc: host_no=%d, id=%d, sdp=%p, cmd=0x%x\n",
               (int)SCpnt->device->host->host_no, (int)SCpnt->device->id,
               SCpnt->device, (int)*cmd);
#endif
        if (NULL == SCpnt->device->hostdata) {
                devip = devInfoReg(SCpnt->device);
                if (NULL == devip)
                        return schedule_resp(SCpnt, NULL, done,
                                             DID_NO_CONNECT << 16, 0);
                SCpnt->device->hostdata = devip;
        }
        devip = SCpnt->device->hostdata;
 
        if ((SCSI_DEBUG_OPT_EVERY_NTH & scsi_debug_opts) &&
            (scsi_debug_every_nth > 0) &&
            (++scsi_debug_cmnd_count >= scsi_debug_every_nth)) {
                scsi_debug_cmnd_count =0;
                return 0; /* ignore command causing timeout */
        }
 
        switch (*cmd) {
        case INQUIRY:     /* mandatory */
                /* assume INQUIRY called first so setup max_cmd_len */
                if (SCpnt->host->max_cmd_len != SCSI_DEBUG_MAX_CMD_LEN)
                        SCpnt->host->max_cmd_len = SCSI_DEBUG_MAX_CMD_LEN;
                errsts = resp_inquiry(cmd, target, buff, bufflen, devip);
                break;
        case REQUEST_SENSE:     /* mandatory */
                /* Since this driver indicates autosense by placing the
                 * sense buffer in the scsi_cmnd structure in the response
                 * (when CHECK_CONDITION is set), the mid level shouldn't
                 * need to call REQUEST_SENSE */
                if (devip) {
                        sbuff = devip->sense_buff;
                        memcpy(buff, sbuff, (bufflen < SDEBUG_SENSE_LEN) ?
                                             bufflen : SDEBUG_SENSE_LEN);
                        mk_sense_buffer(devip, 0, 0x0, 0, 7);
                } else {
                        memset(buff, 0, bufflen);
                        buff[0] = 0x70;
                }
                break;
        case START_STOP:
                errsts = check_reset(SCpnt, devip);
                break;
        case ALLOW_MEDIUM_REMOVAL:
                if ((errsts = check_reset(SCpnt, devip)))
                        break;
                if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
                        printk("\tMedium removal %s\n",
                               cmd[4] ? "inhibited" : "enabled");
                break;
        case SEND_DIAGNOSTIC:     /* mandatory */
                memset(buff, 0, bufflen);
                break;
        case TEST_UNIT_READY:     /* mandatory */
                memset(buff, 0, bufflen);
                break;
        case RESERVE:
                errsts = check_reset(SCpnt, devip);
                memset(buff, 0, bufflen);
                break;
        case RESERVE_10:
                errsts = check_reset(SCpnt, devip);
                memset(buff, 0, bufflen);
                break;
        case RELEASE:
                errsts = check_reset(SCpnt, devip);
                memset(buff, 0, bufflen);
                break;
        case RELEASE_10:
                errsts = check_reset(SCpnt, devip);
                memset(buff, 0, bufflen);
                break;
        case READ_CAPACITY:
                errsts = check_reset(SCpnt, devip);
                memset(buff, 0, bufflen);
                if (bufflen > 7) {
                        capac = CAPACITY - 1;
                        buff[0] = (capac >> 24);
                        buff[1] = (capac >> 16) & 0xff;
                        buff[2] = (capac >> 8) & 0xff;
                        buff[3] = capac & 0xff;
                        buff[6] = (SECT_SIZE_PER(target) >> 8) & 0xff;
                        buff[7] = SECT_SIZE_PER(target) & 0xff;
                }
                break;
        case SCSI_CMD_READ_16:  /* SBC-2 */
        case READ_12:
        case READ_10:
        case READ_6:
                if ((errsts = check_reset(SCpnt, devip)))
                        break;
                upper_blk = 0;
                if ((*cmd) == SCSI_CMD_READ_16) {
                        upper_blk = cmd[5] + (cmd[4] << 8) +
                                    (cmd[3] << 16) + (cmd[2] << 24);
                        block = cmd[9] + (cmd[8] << 8) +
                                (cmd[7] << 16) + (cmd[6] << 24);
                        num = cmd[13] + (cmd[12] << 8) +
                                (cmd[11] << 16) + (cmd[10] << 24);
                } else if ((*cmd) == READ_12) {
                        block = cmd[5] + (cmd[4] << 8) +
                                (cmd[3] << 16) + (cmd[2] << 24);
                        num = cmd[9] + (cmd[8] << 8) +
                                (cmd[7] << 16) + (cmd[6] << 24);
                } else if ((*cmd) == READ_10) {
                        block = cmd[5] + (cmd[4] << 8) +
                                (cmd[3] << 16) + (cmd[2] << 24);
                        num = cmd[8] + (cmd[7] << 8);
                } else {
                        block = cmd[3] + (cmd[2] << 8) +
                                ((cmd[1] & 0x1f) << 16);
                        num = cmd[4];
                }
                errsts = resp_read(SCpnt, upper_blk, block, num, devip);
                break;
        case REPORT_LUNS:
                errsts = resp_report_luns(cmd, buff, bufflen, devip);
                break;
        case SCSI_CMD_WRITE_16: /* SBC-2 */
        case WRITE_12:
        case WRITE_10:
        case WRITE_6:
                if ((errsts = check_reset(SCpnt, devip)))
                        break;
                upper_blk = 0;
                if ((*cmd) == SCSI_CMD_WRITE_16) {
                        upper_blk = cmd[5] + (cmd[4] << 8) +
                                    (cmd[3] << 16) + (cmd[2] << 24);
                        block = cmd[9] + (cmd[8] << 8) +
                                (cmd[7] << 16) + (cmd[6] << 24);
                        num = cmd[13] + (cmd[12] << 8) +
                                (cmd[11] << 16) + (cmd[10] << 24);
                } else if ((*cmd) == WRITE_12) {
                        block = cmd[5] + (cmd[4] << 8) +
                                (cmd[3] << 16) + (cmd[2] << 24);
                        num = cmd[9] + (cmd[8] << 8) +
                                (cmd[7] << 16) + (cmd[6] << 24);
                } else if ((*cmd) == WRITE_10) {
                        block = cmd[5] + (cmd[4] << 8) +
                                (cmd[3] << 16) + (cmd[2] << 24);
                        num = cmd[8] + (cmd[7] << 8);
                } else {
                        block = cmd[3] + (cmd[2] << 8) +
                                ((cmd[1] & 0x1f) << 16);
                        num = cmd[4];
                }
                errsts = resp_write(SCpnt, upper_blk, block, num, devip);
                break;
        case MODE_SENSE:
        case MODE_SENSE_10:
                errsts = resp_mode_sense(cmd, target, buff, bufflen, devip);
                break;
        default:
#if 0
                printk(KERN_INFO "scsi_debug: Unsupported command, "
                       "opcode=0x%x\n", (int)cmd[0]);
#endif
                if ((errsts = check_reset(SCpnt, devip)))
                        break;
                mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x20, 0, 14);
                errsts = (COMMAND_COMPLETE << 8) | (CHECK_CONDITION << 1);
                break;
        }
        return schedule_resp(SCpnt, devip, done, errsts, scsi_debug_delay);
}
 
static int scsi_debug_ioctl(Scsi_Device *dev, int cmd, void *arg)
{
        if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) {
                printk(KERN_INFO "scsi_debug: ioctl: cmd=0x%x\n", cmd);
        }
        /* return -ENOTTY; // Unix mandates this but apps get upset */
        return -EINVAL;
}
 
static int check_reset(Scsi_Cmnd * SCpnt, struct sdebug_dev_info * devip)
{
        if (devip->reset) {
                devip->reset = 0;
                mk_sense_buffer(devip, UNIT_ATTENTION, 0x29, 0, 14);
                return (COMMAND_COMPLETE << 8) | (CHECK_CONDITION << 1);
        }
        return 0;
}
 
#define SDEBUG_LONG_INQ_SZ 58
#define SDEBUG_MAX_INQ_ARR_SZ 128
 
static const char * vendor_id = "Linux   ";
static const char * product_id = "scsi_debug      ";
static const char * product_rev = "0004";
 
static int inquiry_evpd_83(unsigned char * arr, int dev_id_num,
                           const char * dev_id_str, int dev_id_str_len)
{
        int num;
 
        /* Two identification descriptors: */
        /* T10 vendor identifier field format (faked) */
        arr[0] = 0x2;    /* ASCII */
        arr[1] = 0x1;
        arr[2] = 0x0;
        memcpy(&arr[4], vendor_id, 8);
        memcpy(&arr[12], product_id, 16);
        memcpy(&arr[28], dev_id_str, dev_id_str_len);
        num = 8 + 16 + dev_id_str_len;
        arr[3] = num;
        num += 4;
        /* NAA IEEE registered identifier (faked) */
        arr[num] = 0x1; /* binary */
        arr[num + 1] = 0x3;
        arr[num + 2] = 0x0;
        arr[num + 3] = 0x8;
        arr[num + 4] = 0x51;    /* ieee company id=0x123456 (faked) */
        arr[num + 5] = 0x23;
        arr[num + 6] = 0x45;
        arr[num + 7] = 0x60;
        arr[num + 8] = (dev_id_num >> 24);
        arr[num + 9] = (dev_id_num >> 16) & 0xff;
        arr[num + 10] = (dev_id_num >> 8) & 0xff;
        arr[num + 11] = dev_id_num & 0xff;
        return num + 12;
}
 
static int resp_inquiry(unsigned char * cmd, int target, unsigned char * buff,
                        int bufflen, struct sdebug_dev_info * devip)
{
        unsigned char pq_pdt;
        unsigned char arr[SDEBUG_MAX_INQ_ARR_SZ];
        int min_len = bufflen > SDEBUG_MAX_INQ_ARR_SZ ?
                        SDEBUG_MAX_INQ_ARR_SZ : bufflen;
 
        if (bufflen < cmd[4])
                printk(KERN_INFO "scsi_debug: inquiry: bufflen=%d "
                       "< alloc_length=%d\n", bufflen, (int)cmd[4]);
        memset(buff, 0, bufflen);
        memset(arr, 0, SDEBUG_MAX_INQ_ARR_SZ);
        pq_pdt = PERIPH_DEVICE_TYPE(target);
        arr[0] = pq_pdt;
        if (0x2 & cmd[1]) {  /* CMDDT bit set */
                mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x24, 0, 14);
                return (COMMAND_COMPLETE << 8) | (CHECK_CONDITION << 1);
        } else if (0x1 & cmd[1]) {  /* EVPD bit set */
                int dev_id_num, len;
                char dev_id_str[6];
 
                dev_id_num = ((devip->sdp->host->host_no + 1) * 1000) +
                              devip->sdp->id;
                len = snprintf(dev_id_str, 6, "%d", dev_id_num);
                len = (len > 6) ? 6 : len;
                if (0 == cmd[2]) { /* supported vital product data pages */
                        arr[3] = 3;
                        arr[4] = 0x0; /* this page */
                        arr[5] = 0x80; /* unit serial number */
                        arr[6] = 0x83; /* device identification */
                } else if (0x80 == cmd[2]) { /* unit serial number */
                        arr[1] = 0x80;
                        arr[3] = len;
                        memcpy(&arr[4], dev_id_str, len);
                } else if (0x83 == cmd[2]) { /* device identification */
                        arr[1] = 0x83;
                        arr[3] = inquiry_evpd_83(&arr[4], dev_id_num,
                                                 dev_id_str, len);
                } else {
                        /* Illegal request, invalid field in cdb */
                        mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x24, 0, 14);
                        return (COMMAND_COMPLETE << 8) | (CHECK_CONDITION << 1);
                }
                memcpy(buff, arr, min_len);
                return 0;
        }
        /* drops through here for a standard inquiry */
        arr[1] = DEV_REMOVEABLE(target) ? 0x80 : 0;      /* Removable disk */
        arr[2] = 3;     /* claim SCSI 3 */
        arr[4] = SDEBUG_LONG_INQ_SZ - 5;
        arr[7] = 0x3a; /* claim: WBUS16, SYNC, LINKED + CMDQUE */
        memcpy(&arr[8], vendor_id, 8);
        memcpy(&arr[16], product_id, 16);
        memcpy(&arr[32], product_rev, 4);
        memcpy(buff, arr, min_len);
        return 0;
}
 
/* <<Following mode page info copied from ST318451LW>> */
 
static int resp_err_recov_pg(unsigned char * p, int pcontrol, int target)
{       /* Read-Write Error Recovery page for mode_sense */
        unsigned char err_recov_pg[] = {0x1, 0xa, 0xc0, 11, 240, 0, 0, 0,
                                        5, 0, 0xff, 0xff};
 
        memcpy(p, err_recov_pg, sizeof(err_recov_pg));
        if (1 == pcontrol)
                memset(p + 2, 0, sizeof(err_recov_pg) - 2);
        return sizeof(err_recov_pg);
}
 
static int resp_disconnect_pg(unsigned char * p, int pcontrol, int target)
{       /* Disconnect-Reconnect page for mode_sense */
        unsigned char disconnect_pg[] = {0x2, 0xe, 128, 128, 0, 10, 0, 0,
                                         0, 0, 0, 0, 0, 0, 0, 0};
 
        memcpy(p, disconnect_pg, sizeof(disconnect_pg));
        if (1 == pcontrol)
                memset(p + 2, 0, sizeof(disconnect_pg) - 2);
        return sizeof(disconnect_pg);
}
 
static int resp_format_pg(unsigned char * p, int pcontrol, int target)
{       /* Format device page for mode_sense */
        unsigned char format_pg[] = {0x3, 0x16, 0, 0, 0, 0, 0, 0,
                                     0, 0, 0, 0, 0, 0, 0, 0,
                                     0, 0, 0, 0, 0x40, 0, 0, 0};
 
        memcpy(p, format_pg, sizeof(format_pg));
        p[10] = (N_SECTOR >> 8) & 0xff;
        p[11] = N_SECTOR & 0xff;
        p[12] = (SECT_SIZE >> 8) & 0xff;
        p[13] = SECT_SIZE & 0xff;
        if (DEV_REMOVEABLE(target))
                p[20] |= 0x20; /* should agree with INQUIRY */
        if (1 == pcontrol)
                memset(p + 2, 0, sizeof(format_pg) - 2);
        return sizeof(format_pg);
}
 
static int resp_caching_pg(unsigned char * p, int pcontrol, int target)
{       /* Caching page for mode_sense */
        unsigned char caching_pg[] = {0x8, 18, 0x14, 0, 0xff, 0xff, 0, 0,
                0xff, 0xff, 0xff, 0xff, 0x80, 0x14, 0, 0,     0, 0, 0, 0};
 
        memcpy(p, caching_pg, sizeof(caching_pg));
        if (1 == pcontrol)
                memset(p + 2, 0, sizeof(caching_pg) - 2);
        return sizeof(caching_pg);
}
 
static int resp_ctrl_m_pg(unsigned char * p, int pcontrol, int target)
{       /* Control mode page for mode_sense */
        unsigned char ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0,
                                     0, 0, 0x2, 0x4b};
 
        memcpy(p, ctrl_m_pg, sizeof(ctrl_m_pg));
        if (1 == pcontrol)
                memset(p + 2, 0, sizeof(ctrl_m_pg) - 2);
        return sizeof(ctrl_m_pg);
}
 
 
#define SDEBUG_MAX_MSENSE_SZ 256
 
static int resp_mode_sense(unsigned char * cmd, int target,
                           unsigned char * buff, int bufflen,
                           struct sdebug_dev_info * devip)
{
        unsigned char dbd;
        int pcontrol, pcode;
        unsigned char dev_spec;
        int alloc_len, msense_6, offset, len;
        unsigned char * ap;
        unsigned char arr[SDEBUG_MAX_MSENSE_SZ];
        int min_len = bufflen > SDEBUG_MAX_MSENSE_SZ ?
                        SDEBUG_MAX_MSENSE_SZ : bufflen;
 
        SCSI_LOG_LLQUEUE(3, printk("Mode sense ...(%p %d)\n", buff, bufflen));
        dbd = cmd[1] & 0x8;
        pcontrol = (cmd[2] & 0xc0) >> 6;
        pcode = cmd[2] & 0x3f;
        msense_6 = (MODE_SENSE == cmd[0]);
        alloc_len = msense_6 ? cmd[4] : ((cmd[7] << 8) | cmd[6]);
        /* printk(KERN_INFO "msense: dbd=%d pcontrol=%d pcode=%d "
                "msense_6=%d alloc_len=%d\n", dbd, pcontrol, pcode, "
                "msense_6, alloc_len); */
        if (bufflen < alloc_len)
                printk(KERN_INFO "scsi_debug: mode_sense: bufflen=%d "
                       "< alloc_length=%d\n", bufflen, alloc_len);
        memset(buff, 0, bufflen);
        memset(arr, 0, SDEBUG_MAX_MSENSE_SZ);
        if (0x3 == pcontrol) {  /* Saving values not supported */
                mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x39, 0, 14);
                return (COMMAND_COMPLETE << 8) | (CHECK_CONDITION << 1);
        }
        dev_spec = DEV_READONLY(target) ? 0x80 : 0x0;
        if (msense_6) {
                arr[2] = dev_spec;
                offset = 4;
        } else {
                arr[3] = dev_spec;
                offset = 8;
        }
        ap = arr + offset;
 
        switch (pcode) {
        case 0x1:       /* Read-Write error recovery page, direct access */
                len = resp_err_recov_pg(ap, pcontrol, target);
                offset += len;
                break;
        case 0x2:       /* Disconnect-Reconnect page, all devices */
                len = resp_disconnect_pg(ap, pcontrol, target);
                offset += len;
                break;
        case 0x3:       /* Format device page, direct access */
                len = resp_format_pg(ap, pcontrol, target);
                offset += len;
                break;
        case 0x8:       /* Caching page, direct access */
                len = resp_caching_pg(ap, pcontrol, target);
                offset += len;
                break;
        case 0xa:       /* Control Mode page, all devices */
                len = resp_ctrl_m_pg(ap, pcontrol, target);
                offset += len;
                break;
        case 0x3f:      /* Read all Mode pages */
                len = resp_err_recov_pg(ap, pcontrol, target);
                len += resp_disconnect_pg(ap + len, pcontrol, target);
                len += resp_caching_pg(ap + len, pcontrol, target);
                len += resp_ctrl_m_pg(ap + len, pcontrol, target);
                offset += len;
                break;
        default:
                mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x24, 0, 14);
                return (COMMAND_COMPLETE << 8) | (CHECK_CONDITION << 1);
        }
        if (msense_6)
                arr[0] = offset - 1;
        else {
                offset -= 2;
                arr[0] = (offset >> 8) & 0xff;
                arr[1] = offset & 0xff;
        }
        memcpy(buff, arr, min_len);
        return 0;
}
 
static int resp_read(Scsi_Cmnd * SCpnt, int upper_blk, int block, int num,
                     struct sdebug_dev_info * devip)
{
        unsigned char *buff = (unsigned char *) SCpnt->request_buffer;
        int nbytes, sgcount;
        struct scatterlist *sgpnt = NULL;
        int bufflen = SCpnt->request_bufflen;
        unsigned long iflags;
 
        if (upper_blk || (block + num > CAPACITY)) {
                mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x21, 0, 14);
                return (COMMAND_COMPLETE << 8) | (CHECK_CONDITION << 1);
        }
        if ((SCSI_DEBUG_OPT_MEDIUM_ERR & scsi_debug_opts) &&
            (block >= OPT_MEDIUM_ERR_ADDR) &&
            (block < (OPT_MEDIUM_ERR_ADDR + num))) {
                mk_sense_buffer(devip, MEDIUM_ERROR, 0x11, 0, 14);
                /* claim unrecoverable read error */
                return (COMMAND_COMPLETE << 8) | (CHECK_CONDITION << 1);
        }
        read_lock_irqsave(&atomic_rw, iflags);
        sgcount = 0;
        nbytes = bufflen;
        /* printk(KERN_INFO "scsi_debug_read: block=%d, tot_bufflen=%d\n",
               block, bufflen); */
        if (SCpnt->use_sg) {
                sgcount = 0;
                sgpnt = (struct scatterlist *) buff;
                buff = sgpnt[sgcount].address;
                bufflen = sgpnt[sgcount].length;
        }
        do {
                memcpy(buff, fake_storep + (block * SECT_SIZE), bufflen);
                nbytes -= bufflen;
                if (SCpnt->use_sg) {
                        block += bufflen >> POW2_SECT_SIZE;
                        sgcount++;
                        if (nbytes) {
                                buff = sgpnt[sgcount].address;
                                bufflen = sgpnt[sgcount].length;
                        }
                } else if (nbytes > 0)
                        printk(KERN_WARNING "scsi_debug:resp_read: unexpected "
                               "nbytes=%d\n", nbytes);
        } while (nbytes);
        read_unlock_irqrestore(&atomic_rw, iflags);
        return 0;
}
 
static int resp_write(Scsi_Cmnd * SCpnt, int upper_blk, int block, int num,
                      struct sdebug_dev_info * devip)
{
        unsigned char *buff = (unsigned char *) SCpnt->request_buffer;
        int nbytes, sgcount;
        struct scatterlist *sgpnt = NULL;
        int bufflen = SCpnt->request_bufflen;
        unsigned long iflags;
 
        if (upper_blk || (block + num > CAPACITY)) {
                mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x21, 0, 14);
                return (COMMAND_COMPLETE << 8) | (CHECK_CONDITION << 1);
        }
 
        write_lock_irqsave(&atomic_rw, iflags);
        sgcount = 0;
        nbytes = bufflen;
        if (SCpnt->use_sg) {
                sgcount = 0;
                sgpnt = (struct scatterlist *) buff;
                buff = sgpnt[sgcount].address;
                bufflen = sgpnt[sgcount].length;
        }
        do {
                memcpy(fake_storep + (block * SECT_SIZE), buff, bufflen);
 
                nbytes -= bufflen;
                if (SCpnt->use_sg) {
                        block += bufflen >> POW2_SECT_SIZE;
                        sgcount++;
                        if (nbytes) {
                                buff = sgpnt[sgcount].address;
                                bufflen = sgpnt[sgcount].length;
                        }
                } else if (nbytes > 0)
                        printk(KERN_WARNING "scsi_debug:resp_write: "
                               "unexpected nbytes=%d\n", nbytes);
        } while (nbytes);
        write_unlock_irqrestore(&atomic_rw, iflags);
        return 0;
}
 
static int resp_report_luns(unsigned char * cmd, unsigned char * buff,
                            int bufflen, struct sdebug_dev_info * devip)
{
        unsigned int alloc_len;
        int select_report = (int)cmd[2];
 
        alloc_len = cmd[9] + (cmd[8] << 8) + (cmd[7] << 16) + (cmd[6] << 24);
        if ((alloc_len < 16) || (select_report > 2)) {
                mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x24, 0, 14);
                return (COMMAND_COMPLETE << 8) | (CHECK_CONDITION << 1);
        }
        if (bufflen > 3) {
                memset(buff, 0, bufflen);
                buff[3] = 8;
        }
        return 0;
}
 
/* When timer goes off this function is called. */
static void timer_intr_handler(unsigned long indx)
{
        struct sdebug_queued_cmd * sqcp;
        unsigned int iflags;
 
        if (indx >= SCSI_DEBUG_CANQUEUE) {
                printk(KERN_ERR "scsi_debug:timer_intr_handler: indx too "
                       "large\n");
                return;
        }
        spin_lock_irqsave(&queued_arr_lock, iflags);
        sqcp = &queued_arr[(int)indx];
        if (! sqcp->in_use) {
                printk(KERN_ERR "scsi_debug:timer_intr_handler: Unexpected "
                       "interrupt\n");
                spin_unlock_irqrestore(&queued_arr_lock, iflags);
                return;
        }
        sqcp->in_use = 0;
        if (sqcp->done_funct)
                sqcp->done_funct(sqcp->a_cmnd); /* callback to mid level */
        sqcp->done_funct = NULL;
        spin_unlock_irqrestore(&queued_arr_lock, iflags);
}
 
static int initialized = 0;
static int num_present = 0;
static const char * sdebug_proc_name = "scsi_debug";
 
static int scsi_debug_detect(Scsi_Host_Template * tpnt)
{
        int k, sz;
 
        if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
                printk(KERN_INFO "scsi_debug: detect\n");
        if (0 == initialized) {
                ++initialized;
                sz = sizeof(struct sdebug_dev_info) * scsi_debug_num_devs;
                devInfop = vmalloc(sz);
                if (NULL == devInfop) {
                        printk(KERN_ERR "scsi_debug_detect: out of "
                               "memory, 0.5\n");
                        return 0;
                }
                memset(devInfop, 0, sz);
                sz = STORE_SIZE;
                fake_storep = vmalloc(sz);
                if (NULL == fake_storep) {
                        printk(KERN_ERR "scsi_debug_detect: out of memory"
                               ", 0\n");
                        return 0;
                }
                memset(fake_storep, 0, sz);
                init_all_queued();
                tpnt->proc_name = (char *)sdebug_proc_name;
                for (num_present = 0, k = 0; k < NR_HOSTS_PRESENT; k++) {
                        if (NULL == scsi_register(tpnt, 0))
                                printk(KERN_ERR "scsi_debug_detect: "
                                        "scsi_register failed k=%d\n", k);
                        else
                                ++num_present;
                }
                return num_present;
        } else {
                printk(KERN_WARNING "scsi_debug_detect: called again\n");
                return 0;
        }
}
 
 
static int num_releases = 0;
 
static int scsi_debug_release(struct Scsi_Host * hpnt)
{
        if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
                printk(KERN_INFO "scsi_debug: release\n");
        stop_all_queued();
        scsi_unregister(hpnt);
        if (++num_releases == num_present) {
                vfree(fake_storep);
                vfree(devInfop);
        }
        return 0;
}
 
static struct sdebug_dev_info * devInfoReg(Scsi_Device * sdp)
{
        int k;
        struct sdebug_dev_info * devip;
 
        for (k = 0; k < scsi_debug_num_devs; ++k) {
                devip = &devInfop[k];
                if (devip->sdp == sdp)
                        return devip;
        }
        for (k = 0; k < scsi_debug_num_devs; ++k) {
                devip = &devInfop[k];
                if (NULL == devip->sdp) {
                        devip->sdp = sdp;
                        devip->reset = 1;
                        memset(devip->sense_buff, 0, SDEBUG_SENSE_LEN);
                        devip->sense_buff[0] = 0x70;
                        return devip;
                }
        }
        return NULL;
}
 
static void mk_sense_buffer(struct sdebug_dev_info * devip, int key,
                            int asc, int asq, int inbandLen)
{
        unsigned char * sbuff;
 
        sbuff = devip->sense_buff;
        memset(sbuff, 0, SDEBUG_SENSE_LEN);
        if (inbandLen > SDEBUG_SENSE_LEN)
                inbandLen = SDEBUG_SENSE_LEN;
        sbuff[0] = 0x70;
        sbuff[2] = key;
        sbuff[7] = (inbandLen > 7) ? (inbandLen - 8) : 0;
        sbuff[12] = asc;
        sbuff[13] = asq;
}
 
static int scsi_debug_abort(Scsi_Cmnd * SCpnt)
{
        if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
                printk(KERN_INFO "scsi_debug: abort\n");
        ++num_aborts;
        stop_queued_cmnd(SCpnt);
        return SUCCESS;
}
 
static int scsi_debug_biosparam(Disk * disk, kdev_t dev, int *info)
{
        if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
                printk(KERN_INFO "scsi_debug: biosparam\n");
        /* int size = disk->capacity; */
        info[0] = N_HEAD;
        info[1] = N_SECTOR;
        info[2] = N_CYLINDER;
        if (info[2] >= 1024)
                info[2] = 1024;
        return 0;
}
 
static int scsi_debug_device_reset(Scsi_Cmnd * SCpnt)
{
        Scsi_Device * sdp;
        int k;
 
        if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
                printk(KERN_INFO "scsi_debug: device_reset\n");
        ++num_dev_resets;
        if (SCpnt && ((sdp = SCpnt->device))) {
                for (k = 0; k < scsi_debug_num_devs; ++k) {
                        if (sdp->hostdata == (devInfop + k))
                                break;
                }
                if (k < scsi_debug_num_devs)
                        devInfop[k].reset = 1;
        }
        return SUCCESS;
}
 
static int scsi_debug_bus_reset(Scsi_Cmnd * SCpnt)
{
        Scsi_Device * sdp;
        struct Scsi_Host * hp;
        int k;
 
        if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
                printk(KERN_INFO "scsi_debug: bus_reset\n");
        ++num_bus_resets;
        if (SCpnt && ((sdp = SCpnt->device)) && ((hp = sdp->host))) {
                for (k = 0; k < scsi_debug_num_devs; ++k) {
                        if (hp == devInfop[k].sdp->host)
                                devInfop[k].reset = 1;
                }
        }
        return SUCCESS;
}
 
static int scsi_debug_host_reset(Scsi_Cmnd * SCpnt)
{
        int k;
 
        if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
                printk(KERN_INFO "scsi_debug: host_reset\n");
        ++num_host_resets;
        for (k = 0; k < scsi_debug_num_devs; ++k)
                devInfop[k].reset = 1;
        stop_all_queued();
 
        return SUCCESS;
}
 
/* Returns 1 if found 'cmnd' and deleted its timer. else returns 0 */
static int stop_queued_cmnd(struct scsi_cmnd * cmnd)
{
        unsigned long iflags;
        int k;
        struct sdebug_queued_cmd * sqcp;
 
        spin_lock_irqsave(&queued_arr_lock, iflags);
        for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
                sqcp = &queued_arr[k];
                if (sqcp->in_use && (cmnd == sqcp->a_cmnd)) {
                        del_timer_sync(&sqcp->cmnd_timer);
                        sqcp->in_use = 0;
                        sqcp->a_cmnd = NULL;
                        break;
                }
        }
        spin_unlock_irqrestore(&queued_arr_lock, iflags);
        return (k < SCSI_DEBUG_CANQUEUE) ? 1 : 0;
}
 
/* Deletes (stops) timers of all queued commands */
static void stop_all_queued(void)
{
        unsigned long iflags;
        int k;
        struct sdebug_queued_cmd * sqcp;
 
        spin_lock_irqsave(&queued_arr_lock, iflags);
        for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
                sqcp = &queued_arr[k];
                if (sqcp->in_use && sqcp->a_cmnd) {
                        del_timer_sync(&sqcp->cmnd_timer);
                        sqcp->in_use = 0;
                        sqcp->a_cmnd = NULL;
                }
        }
        spin_unlock_irqrestore(&queued_arr_lock, iflags);
}
 
/* Initializes timers in queued array */
static void init_all_queued(void)
{
        unsigned long iflags;
        int k;
        struct sdebug_queued_cmd * sqcp;
 
        spin_lock_irqsave(&queued_arr_lock, iflags);
        for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
                sqcp = &queued_arr[k];
                init_timer(&sqcp->cmnd_timer);
                sqcp->in_use = 0;
                sqcp->a_cmnd = NULL;
        }
        spin_unlock_irqrestore(&queued_arr_lock, iflags);
}
 
static int schedule_resp(struct scsi_cmnd * cmnd,
                         struct sdebug_dev_info * devip,
                         done_funct_t done, int scsi_result, int delta_jiff)
{
        int k, num;
 
        if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) {
                printk(KERN_INFO "scsi_debug: cmd ");
                for (k = 0, num = cmnd->cmd_len; k < num; ++k)
                    printk("%02x ", (int)cmnd->cmnd[k]);
                printk("result=0x%x\n", scsi_result);
        }
        if (cmnd && devip) {
                /* simulate autosense by this driver */
                if (CHECK_CONDITION == status_byte(scsi_result))
                        memcpy(cmnd->sense_buffer, devip->sense_buff,
                               (SCSI_SENSE_BUFFERSIZE > SDEBUG_SENSE_LEN) ?
                               SDEBUG_SENSE_LEN : SCSI_SENSE_BUFFERSIZE);
        }
        if (delta_jiff <= 0) {
                if (cmnd)
                        cmnd->result = scsi_result;
                if (done)
                        done(cmnd);
                return 0;
        } else {
                unsigned long iflags;
                int k;
                struct sdebug_queued_cmd * sqcp = NULL;
 
                spin_lock_irqsave(&queued_arr_lock, iflags);
                for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
                        sqcp = &queued_arr[k];
                        if (! sqcp->in_use)
                                break;
                }
                if (k >= SCSI_DEBUG_CANQUEUE) {
                        spin_unlock_irqrestore(&queued_arr_lock, iflags);
                        printk(KERN_WARNING "scsi_debug: can_queue exceeded\n");
                        return 1;       /* report busy to mid level */
                }
                sqcp->in_use = 1;
                sqcp->a_cmnd = cmnd;
                sqcp->scsi_result = scsi_result;
                sqcp->done_funct = done;
                sqcp->cmnd_timer.function = timer_intr_handler;
                sqcp->cmnd_timer.data = k;
                sqcp->cmnd_timer.expires = jiffies + delta_jiff;
                add_timer(&sqcp->cmnd_timer);
                spin_unlock_irqrestore(&queued_arr_lock, iflags);
                return 0;
        }
}
 
#ifndef MODULE
static int __init num_devs_setup(char *str)
{
    int tmp;
 
    if (get_option(&str, &tmp) == 1) {
        if (tmp > 0)
            scsi_debug_num_devs = tmp;
        return 1;
    } else {
        printk(KERN_INFO "scsi_debug_num_devs: usage scsi_debug_num_devs=<n> "
               "(<n> can be from 1 to around 2000)\n");
        return 0;
    }
}
__setup("scsi_debug_num_devs=", num_devs_setup);
 
static int __init dev_size_mb_setup(char *str)
{
    int tmp;
 
    if (get_option(&str, &tmp) == 1) {
        if (tmp > 0)
            scsi_debug_dev_size_mb = tmp;
        return 1;
    } else {
        printk(KERN_INFO "scsi_debug_dev_size_mb: usage "
               "scsi_debug_dev_size_mb=<n>\n"
               "    (<n> is number of MB ram shared by all devs\n");
        return 0;
    }
}
__setup("scsi_debug_dev_size_mb=", dev_size_mb_setup);
 
static int __init opts_setup(char *str)
{
    int tmp;
 
    if (get_option(&str, &tmp) == 1) {
        if (tmp > 0)
            scsi_debug_opts = tmp;
        return 1;
    } else {
        printk(KERN_INFO "scsi_debug_opts: usage "
               "scsi_debug_opts=<n>\n"
               "    (1->noise, 2->medium_error, 4->... (can be or-ed)\n");
        return 0;
    }
}
__setup("scsi_debug_opts=", opts_setup);
 
static int __init every_nth_setup(char *str)
{
    int tmp;
 
    if (get_option(&str, &tmp) == 1) {
        if (tmp > 0)
            scsi_debug_every_nth = tmp;
        return 1;
    } else {
        printk(KERN_INFO "scsi_debug_every_nth: usage "
               "scsi_debug_every_nth=<n>\n"
               "    timeout every nth command (when ...)\n");
        return 0;
    }
}
__setup("scsi_debug_every_nth=", every_nth_setup);
 
static int __init delay_setup(char *str)
{
    int tmp;
 
    if (get_option(&str, &tmp) == 1) {
        scsi_debug_delay = tmp;
        return 1;
    } else {
        printk(KERN_INFO "scsi_debug_delay: usage "
               "scsi_debug_delay=<n>\n"
               "    delay response <n> jiffies\n");
        return 0;
    }
}
__setup("scsi_debug_delay=", delay_setup);
 
#endif
 
MODULE_AUTHOR("Eric Youngdale + Douglas Gilbert");
MODULE_DESCRIPTION("SCSI debug adapter driver");
MODULE_PARM(scsi_debug_num_devs, "i");
MODULE_PARM_DESC(scsi_debug_num_devs, "number of SCSI devices to simulate");
MODULE_PARM(scsi_debug_dev_size_mb, "i");
MODULE_PARM_DESC(scsi_debug_dev_size_mb, "size in MB of ram shared by devs");
MODULE_PARM(scsi_debug_opts, "i");
MODULE_PARM_DESC(scsi_debug_opts, "1->noise, 2->medium_error, 4->...");
MODULE_PARM(scsi_debug_every_nth, "i");
MODULE_PARM_DESC(scsi_debug_every_nth, "timeout every nth command(def=100)");
MODULE_PARM(scsi_debug_delay, "i");
MODULE_PARM_DESC(scsi_debug_delay, "# of jiffies to delay response(def=1)");
#ifdef MODULE_LICENSE
MODULE_LICENSE("GPL");
#endif
 
static char sdebug_info[256];
 
static const char * scsi_debug_info(struct Scsi_Host * shp)
{
        sprintf(sdebug_info, "scsi_debug, %s, num_devs=%d, "
                "dev_size_mb=%d, opts=0x%x", scsi_debug_version_str,
                scsi_debug_num_devs, scsi_debug_dev_size_mb,
                scsi_debug_opts);
        return sdebug_info;
}
 
/* scsi_debug_proc_info
 * Used if the driver currently has no own support for /proc/scsi
 */
static int scsi_debug_proc_info(char *buffer, char **start, off_t offset,
                                int length, int inode, int inout)
{
        int len, pos, begin;
        int orig_length;
 
        orig_length = length;
 
        if (inout == 1) {
                char arr[16];
                int minLen = length > 15 ? 15 : length;
 
                if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
                        return -EACCES;
                memcpy(arr, buffer, minLen);
                arr[minLen] = '\0';
                if (1 != sscanf(arr, "%d", &pos))
                        return -EINVAL;
                scsi_debug_opts = pos;
                if (SCSI_DEBUG_OPT_EVERY_NTH & scsi_debug_opts)
                        scsi_debug_cmnd_count = 0;
                return length;
        }
        begin = 0;
        pos = len = sprintf(buffer, "scsi_debug adapter driver, %s\n"
            "num_devs=%d, shared (ram) size=%d MB, opts=0x%x, "
            "every_nth=%d(curr:%d)\n"
            "sector_size=%d bytes, cylinders=%d, heads=%d, sectors=%d, "
            "delay=%d\nnumber of aborts=%d, device_reset=%d, bus_resets=%d, "
            "host_resets=%d\n",
            scsi_debug_version_str, scsi_debug_num_devs,
            scsi_debug_dev_size_mb, scsi_debug_opts, scsi_debug_every_nth,
            scsi_debug_cmnd_count,
            SECT_SIZE, N_CYLINDER, N_HEAD, N_SECTOR, scsi_debug_delay,
            num_aborts, num_dev_resets, num_bus_resets, num_host_resets);
        if (pos < offset) {
                len = 0;
                begin = pos;
        }
        *start = buffer + (offset - begin);     /* Start of wanted data */
        len -= (offset - begin);
        if (len > length)
                len = length;
 
        return (len);
}
 
#include "scsi_module.c"
Browse

Tools

Subversion Repositories or1k

[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [scsi/] [scsi_debug.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* linux/kernel/scsi_debug.c`
3			`*`
4			`* Copyright (C) 1992 Eric Youngdale`
5			`* Simulate a host adapter with 2 disks attached. Do a lot of checking`
6			`* to make sure that we are not getting blocks mixed up, and PANIC if`
7			`* anything out of the ordinary is seen.`
8			`*`
9			`* This version is more generic, simulating a variable number of disk`
10			`* (or disk like devices) sharing a common amount of RAM (default 8 MB`
11			`* but can be set at driver/module load time).`
12			`*`
13			`* For documentation see http://www.torque.net/sg/sdebug.html`
14			`*`
15			`* D. Gilbert (dpg) work for Magneto-Optical device test [20010421]`
16			`* dpg: work for devfs large number of disks [20010809]`
17			`* use vmalloc() more inquiry+mode_sense [20020302]`
18			`* add timers for delayed responses [20020721]`
19			`*/`
20
21			`#include <linux/config.h>`
22			`#include <linux/module.h>`
23
24			`#include <linux/kernel.h>`
25			`#include <linux/sched.h>`
26			`#include <linux/errno.h>`
27			`#include <linux/timer.h>`
28			`#include <linux/types.h>`
29			`#include <linux/string.h>`
30			`#include <linux/genhd.h>`
31			`#include <linux/fs.h>`
32			`#include <linux/init.h>`
33			`#include <linux/proc_fs.h>`
34			`#include <linux/smp_lock.h>`
35			`#include <linux/vmalloc.h>`
36
37			`#include <asm/io.h>`
38
39			`#include <linux/blk.h>`
40			`#include "scsi.h"`