From: "Ewan D. Milne" <emilne@xxxxxxxxxx>
Added "report_ua" module parameter to control reporting
of unit attention conditions when the number of LUNs is
changed, or the virtual_gb size of the device is changed.
Also added capability to generate unit attention conditions:
38 07 - THIN PROVISIONING SOFT THRESHOLD REACHED
2A 01 - MODE PARAMETERS CHANGED
Signed-off-by: Ewan D. Milne <emilne@xxxxxxxxxx>
---
drivers/scsi/scsi_debug.c | 131 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 131 insertions(+)
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 182d5a5..738b197 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -111,6 +111,7 @@ static const char * scsi_debug_version_date = "20100324";
#define DEF_PTYPE 0
#define DEF_SCSI_LEVEL 5 /* INQUIRY, byte2 [5->SPC-3] */
#define DEF_SECTOR_SIZE 512
+#define DEF_REPORT_UA 0
#define DEF_UNMAP_ALIGNMENT 0
#define DEF_UNMAP_GRANULARITY 1
#define DEF_UNMAP_MAX_BLOCKS 0xFFFFFFFF
@@ -182,6 +183,7 @@ static int scsi_debug_physblk_exp = DEF_PHYSBLK_EXP;
static int scsi_debug_ptype = DEF_PTYPE; /* SCSI peripheral type (0==disk) */
static int scsi_debug_scsi_level = DEF_SCSI_LEVEL;
static int scsi_debug_sector_size = DEF_SECTOR_SIZE;
+static int scsi_debug_report_ua = DEF_REPORT_UA;
static int scsi_debug_virtual_gb = DEF_VIRTUAL_GB;
static int scsi_debug_vpd_use_hostno = DEF_VPD_USE_HOSTNO;
static unsigned int scsi_debug_lbpu = DEF_LBPU;
@@ -230,6 +232,8 @@ struct sdebug_dev_info {
char reset;
char stopped;
char used;
+ char luns_changed;
+ char sense_pending;
};
struct sdebug_host_info {
@@ -268,6 +272,7 @@ static int num_host_resets = 0;
static int dix_writes;
static int dix_reads;
static int dif_errors;
+static int luns_changed;
static DEFINE_SPINLOCK(queued_arr_lock);
static DEFINE_RWLOCK(atomic_rw);
@@ -2756,6 +2761,7 @@ module_param_named(physblk_exp, scsi_debug_physblk_exp, int, S_IRUGO);
module_param_named(ptype, scsi_debug_ptype, int, S_IRUGO | S_IWUSR);
module_param_named(scsi_level, scsi_debug_scsi_level, int, S_IRUGO);
module_param_named(sector_size, scsi_debug_sector_size, int, S_IRUGO);
+module_param_named(report_ua, scsi_debug_report_ua, int, S_IRUGO | S_IWUSR);
module_param_named(unmap_alignment, scsi_debug_unmap_alignment, int, S_IRUGO);
module_param_named(unmap_granularity, scsi_debug_unmap_granularity, int, S_IRUGO);
module_param_named(unmap_max_blocks, scsi_debug_unmap_max_blocks, int, S_IRUGO);
@@ -2798,6 +2804,7 @@ MODULE_PARM_DESC(physblk_exp, "physical block exponent (def=0)");
MODULE_PARM_DESC(ptype, "SCSI peripheral type(def=0[disk])");
MODULE_PARM_DESC(scsi_level, "SCSI level to simulate(def=5[SPC-3])");
MODULE_PARM_DESC(sector_size, "logical block size in bytes (def=512)");
+MODULE_PARM_DESC(report_ua, "report unit attentions when reconfigured (def=0)");
MODULE_PARM_DESC(unmap_alignment, "lowest aligned thin provisioning lba (def=0)");
MODULE_PARM_DESC(unmap_granularity, "thin provisioning granularity in blocks (def=1)");
MODULE_PARM_DESC(unmap_max_blocks, "max # of blocks can be unmapped in one cmd (def=0xffffffff)");
@@ -3050,10 +3057,37 @@ static ssize_t sdebug_max_luns_store(struct device_driver * ddp,
const char * buf, size_t count)
{
int n;
+ struct sdebug_host_info *sdbg_host;
+ struct sdebug_dev_info *devip;
if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
scsi_debug_max_luns = n;
sdebug_max_tgts_luns();
+
+ if (!scsi_debug_report_ua)
+ return count;
+
+ /*
+ * SPC-3 behavior is to report a UNIT ATTENTION with ASC/ASCQ
+ * REPORTED LUNS DATA HAS CHANGED on every LUN on the target,
+ * until a REPORT LUNS command is received. SPC-4 behavior is
+ * to report it only once. NOTE: scsi_debug_scsi_level does
+ * not use the same values as struct scsi_device->scsi_level.
+ */
+ if (scsi_debug_scsi_level == 5) { /* SPC-3 */
+ spin_lock(&sdebug_host_list_lock);
+ list_for_each_entry(sdbg_host, &sdebug_host_list,
+ host_list) {
+ list_for_each_entry(devip,
+ &sdbg_host->dev_info_list,
+ dev_list) {
+ devip->luns_changed = 1;
+ }
+ }
+ spin_unlock(&sdebug_host_list_lock);
+ } else if (scsi_debug_scsi_level > 5)
+ luns_changed = 1;
+
return count;
}
return -EINVAL;
@@ -3100,12 +3134,27 @@ static ssize_t sdebug_virtual_gb_store(struct device_driver * ddp,
const char * buf, size_t count)
{
int n;
+ struct sdebug_host_info *sdbg_host;
+ struct sdebug_dev_info *devip;
if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
scsi_debug_virtual_gb = n;
sdebug_capacity = get_sdebug_capacity();
+ if (!scsi_debug_report_ua)
+ return count;
+
+ spin_lock(&sdebug_host_list_lock);
+ list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
+ list_for_each_entry(devip, &sdbg_host->dev_info_list,
+ dev_list) {
+ mk_sense_buffer(devip, UNIT_ATTENTION,
+ 0x2a, 0x09);
+ devip->sense_pending = 1;
+ }
+ }
+ spin_unlock(&sdebug_host_list_lock);
return count;
}
return -EINVAL;
@@ -3205,6 +3254,57 @@ static ssize_t sdebug_map_show(struct device_driver *ddp, char *buf)
}
DRIVER_ATTR(map, S_IRUGO, sdebug_map_show, NULL);
+static ssize_t sdebug_soft_threshold_reached_store(struct device_driver *ddp,
+ const char *buf,
+ size_t count)
+{
+ int n;
+ struct sdebug_host_info *sdbg_host;
+ struct sdebug_dev_info *devip;
+
+ if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
+ spin_lock(&sdebug_host_list_lock);
+ list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
+ list_for_each_entry(devip, &sdbg_host->dev_info_list,
+ dev_list) {
+ mk_sense_buffer(devip, UNIT_ATTENTION,
+ 0x38, 0x07);
+ devip->sense_pending = 1;
+ }
+ }
+ spin_unlock(&sdebug_host_list_lock);
+ return count;
+ }
+ return -EINVAL;
+}
+DRIVER_ATTR(soft_threshold_reached, S_IWUSR, NULL,
+ sdebug_soft_threshold_reached_store);
+
+static ssize_t sdebug_mode_parameters_changed_store(struct device_driver *ddp,
+ const char *buf,
+ size_t count)
+{
+ int n;
+ struct sdebug_host_info *sdbg_host;
+ struct sdebug_dev_info *devip;
+
+ if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
+ spin_lock(&sdebug_host_list_lock);
+ list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
+ list_for_each_entry(devip, &sdbg_host->dev_info_list,
+ dev_list) {
+ mk_sense_buffer(devip, UNIT_ATTENTION,
+ 0x2a, 0x01);
+ devip->sense_pending = 1;
+ }
+ }
+ spin_unlock(&sdebug_host_list_lock);
+ return count;
+ }
+ return -EINVAL;
+}
+DRIVER_ATTR(mode_parameters_changed, S_IWUSR, NULL,
+ sdebug_mode_parameters_changed_store);
/* Note: The following function creates attribute files in the
/sys/bus/pseudo/drivers/scsi_debug directory. The advantage of these
@@ -3239,11 +3339,19 @@ static int do_create_driverfs_files(void)
ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_guard);
ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_ato);
ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_map);
+ ret |= driver_create_file(&sdebug_driverfs_driver,
+ &driver_attr_soft_threshold_reached);
+ ret |= driver_create_file(&sdebug_driverfs_driver,
+ &driver_attr_mode_parameters_changed);
return ret;
}
static void do_remove_driverfs_files(void)
{
+ driver_remove_file(&sdebug_driverfs_driver,
+ &driver_attr_mode_parameters_changed);
+ driver_remove_file(&sdebug_driverfs_driver,
+ &driver_attr_soft_threshold_reached);
driver_remove_file(&sdebug_driverfs_driver, &driver_attr_map);
driver_remove_file(&sdebug_driverfs_driver, &driver_attr_ato);
driver_remove_file(&sdebug_driverfs_driver, &driver_attr_guard);
@@ -3597,6 +3705,8 @@ int scsi_debug_queuecommand_lck(struct scsi_cmnd *SCpnt, done_funct_t done)
int inj_dix = 0;
int delay_override = 0;
int unmap = 0;
+ struct sdebug_host_info *sdbg_host;
+ struct sdebug_dev_info *tmpdevip;
scsi_set_resid(SCpnt, 0);
if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmd) {
@@ -3774,6 +3884,15 @@ read:
}
break;
case REPORT_LUNS: /* mandatory, ignore unit attention */
+ luns_changed = 0;
+ spin_lock(&sdebug_host_list_lock);
+ list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
+ list_for_each_entry(tmpdevip, &sdbg_host->dev_info_list,
+ dev_list) {
+ tmpdevip->luns_changed = 0;
+ }
+ }
+ spin_unlock(&sdebug_host_list_lock);
delay_override = 1;
errsts = resp_report_luns(SCpnt, devip);
break;
@@ -3926,6 +4045,18 @@ write:
errsts = check_condition_result;
break;
}
+ if (!errsts && (*cmd != INQUIRY) && (*cmd != REPORT_LUNS)) {
+ if (!devip->sense_pending &&
+ (luns_changed || devip->luns_changed)) {
+ luns_changed = 0;
+ devip->luns_changed = 0;
+ mk_sense_buffer(devip, UNIT_ATTENTION, 0x3f, 0x0e);
+ errsts = check_condition_result;
+ } else if (devip->sense_pending) {
+ devip->sense_pending = 0;
+ errsts = check_condition_result;
+ }
+ }
return schedule_resp(SCpnt, devip, done, errsts,
(delay_override ? 0 : scsi_debug_delay));
}
--
1.7.11.7
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