1 files changed, 1047 insertions, 417 deletions

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 6ed43fd19a22..d19c0e3c7f48 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -42,6 +42,10 @@
 #include <linux/scatterlist.h>
 #include <linux/blkdev.h>
 #include <linux/crc-t10dif.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/atomic.h>
+#include <linux/hrtimer.h>
 
 #include <net/checksum.h>
 
@@ -53,13 +57,16 @@
 #include <scsi/scsi_host.h>
 #include <scsi/scsicam.h>
 #include <scsi/scsi_eh.h>
+#include <scsi/scsi_tcq.h>
 #include <scsi/scsi_dbg.h>
 
 #include "sd.h"
 #include "scsi_logging.h"
 
-#define SCSI_DEBUG_VERSION "1.82"
-static const char * scsi_debug_version_date = "20100324";
+#define SCSI_DEBUG_VERSION "1.84"
+static const char *scsi_debug_version_date = "20140706";
+
+#define MY_NAME "scsi_debug"
 
 /* Additional Sense Code (ASC) */
 #define NO_ADDITIONAL_SENSE 0x0
@@ -72,7 +79,11 @@ static const char * scsi_debug_version_date = "20100324";
 #define INVALID_COMMAND_OPCODE 0x20
 #define INVALID_FIELD_IN_CDB 0x24
 #define INVALID_FIELD_IN_PARAM_LIST 0x26
-#define POWERON_RESET 0x29
+#define UA_RESET_ASC 0x29
+#define UA_CHANGED_ASC 0x2a
+#define POWER_ON_RESET_ASCQ 0x0
+#define BUS_RESET_ASCQ 0x2      /* scsi bus reset occurred */
+#define MODE_CHANGED_ASCQ 0x1   /* mode parameters changed */
 #define SAVING_PARAMS_UNSUP 0x39
 #define TRANSPORT_PROBLEM 0x4b
 #define THRESHOLD_EXCEEDED 0x5d
@@ -81,7 +92,6 @@ static const char * scsi_debug_version_date = "20100324";
 /* Additional Sense Code Qualifier (ASCQ) */
 #define ACK_NAK_TO 0x3
 
-#define SDEBUG_TAGGED_QUEUING 0 /* 0 | MSG_SIMPLE_TAG | MSG_ORDERED_TAG */
 
 /* Default values for driver parameters */
 #define DEF_NUM_HOST   1
@@ -91,7 +101,7 @@ static const char * scsi_debug_version_date = "20100324";
  * (id 0) containing 1 logical unit (lun 0). That is 1 device.
  */
 #define DEF_ATO 1
-#define DEF_DELAY   1
+#define DEF_DELAY   1           /* if > 0 unit is a jiffy */
 #define DEF_DEV_SIZE_MB   8
 #define DEF_DIF 0
 #define DEF_DIX 0
@@ -99,11 +109,13 @@ static const char * scsi_debug_version_date = "20100324";
 #define DEF_EVERY_NTH   0
 #define DEF_FAKE_RW     0
 #define DEF_GUARD 0
+#define DEF_HOST_LOCK 0
 #define DEF_LBPU 0
 #define DEF_LBPWS 0
 #define DEF_LBPWS10 0
 #define DEF_LBPRZ 1
 #define DEF_LOWEST_ALIGNED 0
+#define DEF_NDELAY   0          /* if > 0 unit is a nanosecond */
 #define DEF_NO_LUN_0   0
 #define DEF_NUM_PARTS   0
 #define DEF_OPTS   0
@@ -113,6 +125,7 @@ static const char * scsi_debug_version_date = "20100324";
 #define DEF_REMOVABLE false
 #define DEF_SCSI_LEVEL   5    /* INQUIRY, byte2 [5->SPC-3] */
 #define DEF_SECTOR_SIZE 512
+#define DEF_TAGGED_QUEUING 0 /* 0 | MSG_SIMPLE_TAG | MSG_ORDERED_TAG */
 #define DEF_UNMAP_ALIGNMENT 0
 #define DEF_UNMAP_GRANULARITY 1
 #define DEF_UNMAP_MAX_BLOCKS 0xFFFFFFFF
@@ -120,6 +133,7 @@ static const char * scsi_debug_version_date = "20100324";
 #define DEF_VIRTUAL_GB   0
 #define DEF_VPD_USE_HOSTNO 1
 #define DEF_WRITESAME_LENGTH 0xFFFF
+#define DELAY_OVERRIDDEN -9999
 
 /* bit mask values for scsi_debug_opts */
 #define SCSI_DEBUG_OPT_NOISE   1
@@ -130,7 +144,14 @@ static const char * scsi_debug_version_date = "20100324";
 #define SCSI_DEBUG_OPT_DIF_ERR   32
 #define SCSI_DEBUG_OPT_DIX_ERR   64
 #define SCSI_DEBUG_OPT_MAC_TIMEOUT  128
-#define SCSI_DEBUG_OPT_SHORT_TRANSFER   256
+#define SCSI_DEBUG_OPT_SHORT_TRANSFER   0x100
+#define SCSI_DEBUG_OPT_Q_NOISE  0x200
+#define SCSI_DEBUG_OPT_ALL_TSF  0x400
+#define SCSI_DEBUG_OPT_RARE_TSF 0x800
+#define SCSI_DEBUG_OPT_N_WCE    0x1000
+#define SCSI_DEBUG_OPT_RESET_NOISE 0x2000
+#define SCSI_DEBUG_OPT_NO_CDB_NOISE 0x4000
+#define SCSI_DEBUG_OPT_ALL_NOISE (0x1 | 0x200 | 0x2000)
 /* When "every_nth" > 0 then modulo "every_nth" commands:
  *   - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set
  *   - a RECOVERED_ERROR is simulated on successful read and write
@@ -148,6 +169,19 @@ static const char * scsi_debug_version_date = "20100324";
  * writing a new value (other than -1 or 1) to every_nth via sysfs).
  */
 
+/* As indicated in SAM-5 and SPC-4 Unit Attentions (UAs)are returned in
+ * priority order. In the subset implemented here lower numbers have higher
+ * priority. The UA numbers should be a sequence starting from 0 with
+ * SDEBUG_NUM_UAS being 1 higher than the highest numbered UA. */
+#define SDEBUG_UA_POR 0         /* Power on, reset, or bus device reset */
+#define SDEBUG_UA_BUS_RESET 1
+#define SDEBUG_UA_MODE_CHANGED 2
+#define SDEBUG_NUM_UAS 3
+
+/* for check_readiness() */
+#define UAS_ONLY 1
+#define UAS_TUR 0
+
 /* when 1==SCSI_DEBUG_OPT_MEDIUM_ERR, a medium error is simulated at this
  * sector on read commands: */
 #define OPT_MEDIUM_ERR_ADDR   0x1234 /* that's sector 4660 in decimal */
@@ -158,9 +192,19 @@ static const char * scsi_debug_version_date = "20100324";
 #define SAM2_LUN_ADDRESS_METHOD 0
 #define SAM2_WLUN_REPORT_LUNS 0xc101
 
-/* Can queue up to this number of commands. Typically commands that
- * that have a non-zero delay are queued. */
-#define SCSI_DEBUG_CANQUEUE  255
+/* SCSI_DEBUG_CANQUEUE is the maximum number of commands that can be queued
+ * (for response) at one time. Can be reduced by max_queue option. Command
+ * responses are not queued when delay=0 and ndelay=0. The per-device
+ * DEF_CMD_PER_LUN can be changed via sysfs:
+ * /sys/class/scsi_device/<h:c:t:l>/device/queue_depth but cannot exceed
+ * SCSI_DEBUG_CANQUEUE. */
+#define SCSI_DEBUG_CANQUEUE_WORDS  9    /* a WORD is bits in a long */
+#define SCSI_DEBUG_CANQUEUE  (SCSI_DEBUG_CANQUEUE_WORDS * BITS_PER_LONG)
+#define DEF_CMD_PER_LUN  255
+
+#if DEF_CMD_PER_LUN > SCSI_DEBUG_CANQUEUE
+#warning "Expect DEF_CMD_PER_LUN <= SCSI_DEBUG_CANQUEUE"
+#endif
 
 static int scsi_debug_add_host = DEF_NUM_HOST;
 static int scsi_debug_ato = DEF_ATO;
@@ -175,6 +219,8 @@ static unsigned int scsi_debug_guard = DEF_GUARD;
 static int scsi_debug_lowest_aligned = DEF_LOWEST_ALIGNED;
 static int scsi_debug_max_luns = DEF_MAX_LUNS;
 static int scsi_debug_max_queue = SCSI_DEBUG_CANQUEUE;
+static atomic_t retired_max_queue;      /* if > 0 then was prior max_queue */
+static int scsi_debug_ndelay = DEF_NDELAY;
 static int scsi_debug_no_lun_0 = DEF_NO_LUN_0;
 static int scsi_debug_no_uld = 0;
 static int scsi_debug_num_parts = DEF_NUM_PARTS;
@@ -198,8 +244,11 @@ static unsigned int scsi_debug_unmap_max_desc = DEF_UNMAP_MAX_DESC;
 static unsigned int scsi_debug_write_same_length = DEF_WRITESAME_LENGTH;
 static bool scsi_debug_removable = DEF_REMOVABLE;
 static bool scsi_debug_clustering;
+static bool scsi_debug_host_lock = DEF_HOST_LOCK;