scsi_debug.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 1,869 行 · 第 1/4 页

static int scsi_debug_slave_configure(struct scsi_device * sdp)
{
	struct sdebug_dev_info * devip;

	if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
		printk(KERN_INFO "scsi_debug: slave_configure <%u %u %u %u>\n",
		       sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
	if (sdp->host->max_cmd_len != SCSI_DEBUG_MAX_CMD_LEN)
		sdp->host->max_cmd_len = SCSI_DEBUG_MAX_CMD_LEN;
	devip = devInfoReg(sdp);
	sdp->hostdata = devip;
	if (sdp->host->cmd_per_lun)
		scsi_adjust_queue_depth(sdp, SDEBUG_TAGGED_QUEUING,
					sdp->host->cmd_per_lun);
	return 0;
}

static void scsi_debug_slave_destroy(struct scsi_device * sdp)
{
	struct sdebug_dev_info * devip =
				(struct sdebug_dev_info *)sdp->hostdata;

	if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
		printk(KERN_INFO "scsi_debug: slave_destroy <%u %u %u %u>\n",
		       sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
	if (devip) {
		/* make this slot avaliable for re-use */
		devip->used = 0;
		sdp->hostdata = NULL;
	}
}

static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev)
{
	struct sdebug_host_info * sdbg_host;
	struct sdebug_dev_info * open_devip = NULL;
	struct sdebug_dev_info * devip =
			(struct sdebug_dev_info *)sdev->hostdata;

	if (devip)
		return devip;
	sdbg_host = *(struct sdebug_host_info **) sdev->host->hostdata;
        if(! sdbg_host) {
                printk(KERN_ERR "Host info NULL\n");
		return NULL;
        }
	list_for_each_entry(devip, &sdbg_host->dev_info_list, dev_list) {
		if ((devip->used) && (devip->channel == sdev->channel) &&
                    (devip->target == sdev->id) &&
                    (devip->lun == sdev->lun))
                        return devip;
		else {
			if ((!devip->used) && (!open_devip))
				open_devip = devip;
		}
	}
	if (NULL == open_devip) { /* try and make a new one */
		open_devip = kmalloc(sizeof(*open_devip),GFP_KERNEL);
		if (NULL == open_devip) {
			printk(KERN_ERR "%s: out of memory at line %d\n",
				__FUNCTION__, __LINE__);
			return NULL;
		}
		memset(open_devip, 0, sizeof(*open_devip));
		open_devip->sdbg_host = sdbg_host;
		list_add_tail(&open_devip->dev_list,
		&sdbg_host->dev_info_list);
	}
        if (open_devip) {
		open_devip->channel = sdev->channel;
		open_devip->target = sdev->id;
		open_devip->lun = sdev->lun;
		open_devip->sdbg_host = sdbg_host;
		open_devip->reset = 1;
		open_devip->used = 1;
		memset(open_devip->sense_buff, 0, SDEBUG_SENSE_LEN);
		open_devip->sense_buff[0] = 0x70;
		return open_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(struct 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(struct scsi_device *sdev,
		struct block_device * bdev, sector_t capacity, int *info)
{
	int res;
	unsigned char *buf;

	if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
		printk(KERN_INFO "scsi_debug: biosparam\n");
	buf = scsi_bios_ptable(bdev);
	if (buf) {
		res = scsi_partsize(buf, capacity,
				    &info[2], &info[0], &info[1]);
		kfree(buf);
		if (! res)
			return res;
	}
	info[0] = sdebug_heads;
	info[1] = sdebug_sectors_per;
	info[2] = sdebug_cylinders_per;
	return 0;
}

static int scsi_debug_device_reset(struct scsi_cmnd * SCpnt)
{
	struct sdebug_dev_info * devip;

	if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
		printk(KERN_INFO "scsi_debug: device_reset\n");
	++num_dev_resets;
	if (SCpnt) {
		devip = devInfoReg(SCpnt->device);
		if (devip)
			devip->reset = 1;
	}
	return SUCCESS;
}

static int scsi_debug_bus_reset(struct scsi_cmnd * SCpnt)
{
	struct sdebug_host_info *sdbg_host;
        struct sdebug_dev_info * dev_info;
        struct scsi_device * sdp;
        struct Scsi_Host * hp;

	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))) {
		sdbg_host = *(struct sdebug_host_info **) hp->hostdata;
		if (sdbg_host) {
			list_for_each_entry(dev_info,
                                            &sdbg_host->dev_info_list,
                                            dev_list)
				dev_info->reset = 1;
		}
	}
	return SUCCESS;
}

static int scsi_debug_host_reset(struct scsi_cmnd * SCpnt)
{
	struct sdebug_host_info * sdbg_host;
        struct sdebug_dev_info * dev_info;

	if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
		printk(KERN_INFO "scsi_debug: host_reset\n");
	++num_host_resets;
        spin_lock(&sdebug_host_list_lock);
        list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
                list_for_each_entry(dev_info, &sdbg_host->dev_info_list,
                                    dev_list)
                        dev_info->reset = 1;
        }
        spin_unlock(&sdebug_host_list_lock);
	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 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 void __init sdebug_build_parts(unsigned char * ramp)
{
	struct partition * pp;
	int starts[SDEBUG_MAX_PARTS + 2];
	int sectors_per_part, num_sectors, k;
	int heads_by_sects, start_sec, end_sec;

	/* assume partition table already zeroed */
	if ((scsi_debug_num_parts < 1) || (sdebug_store_size < 1048576))
		return;
	if (scsi_debug_num_parts > SDEBUG_MAX_PARTS) {
		scsi_debug_num_parts = SDEBUG_MAX_PARTS;
		printk(KERN_WARNING "scsi_debug:build_parts: reducing "
				    "partitions to %d\n", SDEBUG_MAX_PARTS);
	}
	num_sectors = (int)(sdebug_store_size / SECT_SIZE);
	sectors_per_part = (num_sectors - sdebug_sectors_per)
			   / scsi_debug_num_parts;
	heads_by_sects = sdebug_heads * sdebug_sectors_per;
        starts[0] = sdebug_sectors_per;
	for (k = 1; k < scsi_debug_num_parts; ++k)
		starts[k] = ((k * sectors_per_part) / heads_by_sects)
			    * heads_by_sects;
	starts[scsi_debug_num_parts] = num_sectors;
	starts[scsi_debug_num_parts + 1] = 0;

	ramp[510] = 0x55;	/* magic partition markings */
	ramp[511] = 0xAA;
	pp = (struct partition *)(ramp + 0x1be);
	for (k = 0; starts[k + 1]; ++k, ++pp) {
		start_sec = starts[k];
		end_sec = starts[k + 1] - 1;
		pp->boot_ind = 0;

		pp->cyl = start_sec / heads_by_sects;
		pp->head = (start_sec - (pp->cyl * heads_by_sects))
			   / sdebug_sectors_per;
		pp->sector = (start_sec % sdebug_sectors_per) + 1;

		pp->end_cyl = end_sec / heads_by_sects;
		pp->end_head = (end_sec - (pp->end_cyl * heads_by_sects))
			       / sdebug_sectors_per;
		pp->end_sector = (end_sec % sdebug_sectors_per) + 1;

		pp->start_sect = start_sec;
		pp->nr_sects = end_sec - start_sec + 1;
		pp->sys_ind = 0x83;	/* plain Linux partition */
	}
}

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) && cmnd) {
		printk(KERN_INFO "scsi_debug: cmd ");
		for (k = 0, num = cmnd->cmd_len; k < num; ++k)
			printk("%02x ", (int)cmnd->cmnd[k]);
		printk("\n");
		if (scsi_result) {
			struct scsi_device * sdp = cmnd->device;

			printk(KERN_INFO "scsi_debug: ... <%u %u %u %u> "
			       "non-zero result=0x%x\n", sdp->host->host_no,
			       sdp->channel, sdp->id, sdp->lun, scsi_result);
		}
	}
	if (cmnd && devip) {
		/* simulate autosense by this driver */
		if (SAM_STAT_CHECK_CONDITION == (scsi_result & 0xff))
			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);
		if (cmnd)
			cmnd->result = 0;
		return 0;
	}
}

/* Set 'perm' (4th argument) to 0 to disable module_param's definition
 * of sysfs parameters (which module_param doesn't yet support).
 * Sysfs parameters defined explicitly below.
 */
module_param_named(add_host, scsi_debug_add_host, int, 0); /* perm=0644 */
module_param_named(delay, scsi_debug_delay, int, 0); /* perm=0644 */
module_param_named(dev_size_mb, scsi_debug_dev_size_mb, int, 0);
module_param_named(every_nth, scsi_debug_every_nth, int, 0);
module_param_named(max_luns, scsi_debug_max_luns, int, 0);
module_param_named(num_parts, scsi_debug_num_parts, int, 0);
module_param_named(num_tgts, scsi_debug_num_tgts, int, 0);
module_param_named(opts, scsi_debug_opts, int, 0); /* perm=0644 */
module_param_named(ptype, scsi_debug_ptype, int, 0);
module_param_named(scsi_level, scsi_debug_scsi_level, int, 0);

MODULE_AUTHOR("Eric Youngdale + Douglas Gilbert");
MODULE_DESCRIPTION("SCSI debug adapter driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(SCSI_DEBUG_VERSION);

MODULE_PARM_DESC(add_host, "0..127 hosts allowed(def=1)");
MODULE_PARM_DESC(delay, "# of jiffies to delay response(def=1)");
MODULE_PARM_DESC(dev_size_mb, "size in MB of ram shared by devs");
MODULE_PARM_DESC(every_nth, "timeout every nth command(def=100)");
MODULE_PARM_DESC(max_luns, "number of SCSI LUNs per target to simulate");
MODULE_PARM_DESC(num_parts, "number of partitions(def=0)");
MODULE_PARM_DESC(num_tgts, "number of SCSI targets per host to simulate");
MODULE_PARM_DESC(opts, "1->noise, 2->medium_error, 4->...");
MODULE_PARM_DESC(ptype, "SCSI peripheral type(def=0[disk])");
MODULE_PARM_DESC(scsi_level, "SCSI level to simulate");


static char sdebug_info[256];

static const char * scsi_debug_info(struct Scsi_Host * shp)
{
	sprintf(sdebug_info, "scsi_debug, version %s [%s], "
		"dev_size_mb=%d, opts=0x%x", SCSI_DEBUG_VERSION,
		scsi_debug_version_date, 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(struct Scsi_Host *host, char *buffer, char **start, off_t offset,
				int length, 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_every_nth > 0)
                        scsi_debug_cmnd_count = 0;
		return length;
	}
	begin = 0;
	pos = len = sprintf(buffer, "scsi_debug adapter driver, version "
	    "%s [%s]\n"
	    "num_tgts=%d, shared (ram) size=%d MB, opts=0x%x, "
	    "every_nth=%d(curr:%d)\n"
	    "delay=%d, max_luns=%d, scsi_level=%d\n"
	    "sector_size=%d bytes, cylinders=%d, heads=%d, sectors=%d\n"
	    "number of aborts=%d, device_reset=%d, bus_resets=%d, "
	    "host_resets=%d\n",
	    SCSI_DEBUG_VERSION, scsi_debug_version_date, scsi_debug_num_tgts,
	    scsi_debug_dev_size_mb, scsi_debug_opts, scsi_debug_every_nth,
	    scsi_debug_cmnd_count, scsi_debug_delay,
	    scsi_debug_max_luns, scsi_debug_scsi_level,
	    SECT_SIZE, sdebug_cylinders_per, sdebug_heads, sdebug_sectors_per,
	    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;
}

static ssize_t sdebug_delay_show(struct device_driver * ddp, char * buf)
{
        return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_delay);
}

static ssize_t sdebug_delay_store(struct device_driver * ddp,
				  const char * buf, size_t count)
{
        int delay;
	char work[20];

        if (1 == sscanf(buf, "%10s", work)) {
		if ((1 == sscanf(work, "%d", &delay)) && (delay >= 0)) {
			scsi_debug_delay = delay;
			return count;
		}
	}
	return -EINVAL;