/*
* 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"
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