summaryrefslogblamecommitdiffstats
path: root/drivers/scsi/scsi.c
blob: d14523d7e44940689c5c7fb93567f4d865c24cf8 (plain) (tree)
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364





































































                                                                            

                                                     










































                                                                               
                            

















































































































































                                                                               





































































































































































































































                                                                                
                                                                             



















































                                                                                     
                                 
































































                                                                                 

























                                                                              





                                                                             




































                                                                               





                                                                      




























                                                                           






















                                                                             
                                            























                                                                            



































































                                                                               
                                                    


















































                                                                              
































































































































































































































































































































































































































































































                                                                               
/*
 *  scsi.c Copyright (C) 1992 Drew Eckhardt
 *         Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
 *         Copyright (C) 2002, 2003 Christoph Hellwig
 *
 *  generic mid-level SCSI driver
 *      Initial versions: Drew Eckhardt
 *      Subsequent revisions: Eric Youngdale
 *
 *  <drew@colorado.edu>
 *
 *  Bug correction thanks go to :
 *      Rik Faith <faith@cs.unc.edu>
 *      Tommy Thorn <tthorn>
 *      Thomas Wuensche <tw@fgb1.fgb.mw.tu-muenchen.de>
 *
 *  Modified by Eric Youngdale eric@andante.org or ericy@gnu.ai.mit.edu to
 *  add scatter-gather, multiple outstanding request, and other
 *  enhancements.
 *
 *  Native multichannel, wide scsi, /proc/scsi and hot plugging
 *  support added by Michael Neuffer <mike@i-connect.net>
 *
 *  Added request_module("scsi_hostadapter") for kerneld:
 *  (Put an "alias scsi_hostadapter your_hostadapter" in /etc/modprobe.conf)
 *  Bjorn Ekwall  <bj0rn@blox.se>
 *  (changed to kmod)
 *
 *  Major improvements to the timeout, abort, and reset processing,
 *  as well as performance modifications for large queue depths by
 *  Leonard N. Zubkoff <lnz@dandelion.com>
 *
 *  Converted cli() code to spinlocks, Ingo Molnar
 *
 *  Jiffies wrap fixes (host->resetting), 3 Dec 1998 Andrea Arcangeli
 *
 *  out_of_space hacks, D. Gilbert (dpg) 990608
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/completion.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/unistd.h>
#include <linux/spinlock.h>
#include <linux/kmod.h>
#include <linux/interrupt.h>
#include <linux/notifier.h>
#include <linux/cpu.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_request.h>

#include "scsi_priv.h"
#include "scsi_logging.h"

static void scsi_done(struct scsi_cmnd *cmd);
static int scsi_retry_command(struct scsi_cmnd *cmd);

/*
 * Definitions and constants.
 */

#define MIN_RESET_DELAY (2*HZ)

/* Do not call reset on error if we just did a reset within 15 sec. */
#define MIN_RESET_PERIOD (15*HZ)

/*
 * Macro to determine the size of SCSI command. This macro takes vendor
 * unique commands into account. SCSI commands in groups 6 and 7 are
 * vendor unique and we will depend upon the command length being
 * supplied correctly in cmd_len.
 */
#define CDB_SIZE(cmd)	(((((cmd)->cmnd[0] >> 5) & 7) < 6) ? \
				COMMAND_SIZE((cmd)->cmnd[0]) : (cmd)->cmd_len)

/*
 * Note - the initial logging level can be set here to log events at boot time.
 * After the system is up, you may enable logging via the /proc interface.
 */
unsigned int scsi_logging_level;
#if defined(CONFIG_SCSI_LOGGING)
EXPORT_SYMBOL(scsi_logging_level);
#endif

const char *const scsi_device_types[MAX_SCSI_DEVICE_CODE] = {
	"Direct-Access    ",
	"Sequential-Access",
	"Printer          ",
	"Processor        ",
	"WORM             ",
	"CD-ROM           ",
	"Scanner          ",
	"Optical Device   ",
	"Medium Changer   ",
	"Communications   ",
	"Unknown          ",
	"Unknown          ",
	"RAID             ",
	"Enclosure        ",
	"Direct-Access-RBC",
};
EXPORT_SYMBOL(scsi_device_types);

/*
 * Function:    scsi_allocate_request
 *
 * Purpose:     Allocate a request descriptor.
 *
 * Arguments:   device		- device for which we want a request
 *		gfp_mask	- allocation flags passed to kmalloc
 *
 * Lock status: No locks assumed to be held.  This function is SMP-safe.
 *
 * Returns:     Pointer to request block.
 */
struct scsi_request *scsi_allocate_request(struct scsi_device *sdev,
					   int gfp_mask)
{
	const int offset = ALIGN(sizeof(struct scsi_request), 4);
	const int size = offset + sizeof(struct request);
	struct scsi_request *sreq;
  
	sreq = kmalloc(size, gfp_mask);
	if (likely(sreq != NULL)) {
		memset(sreq, 0, size);
		sreq->sr_request = (struct request *)(((char *)sreq) + offset);
		sreq->sr_device = sdev;
		sreq->sr_host = sdev->host;
		sreq->sr_magic = SCSI_REQ_MAGIC;
		sreq->sr_data_direction = DMA_BIDIRECTIONAL;
	}

	return sreq;
}
EXPORT_SYMBOL(scsi_allocate_request);

void __scsi_release_request(struct scsi_request *sreq)
{
	struct request *req = sreq->sr_request;

	/* unlikely because the tag was usually ended earlier by the
	 * mid-layer. However, for layering reasons ULD's don't end
	 * the tag of commands they generate. */
	if (unlikely(blk_rq_tagged(req))) {
		unsigned long flags;
		struct request_queue *q = req->q;

		spin_lock_irqsave(q->queue_lock, flags);
		blk_queue_end_tag(q, req);
		spin_unlock_irqrestore(q->queue_lock, flags);
	}


	if (likely(sreq->sr_command != NULL)) {
		struct scsi_cmnd *cmd = sreq->sr_command;

		sreq->sr_command = NULL;
		scsi_next_command(cmd);
	}
}

/*
 * Function:    scsi_release_request
 *
 * Purpose:     Release a request descriptor.
 *
 * Arguments:   sreq    - request to release
 *
 * Lock status: No locks assumed to be held.  This function is SMP-safe.
 */
void scsi_release_request(struct scsi_request *sreq)
{
	__scsi_release_request(sreq);
	kfree(sreq);
}
EXPORT_SYMBOL(scsi_release_request);

struct scsi_host_cmd_pool {
	kmem_cache_t	*slab;
	unsigned int	users;
	char		*name;
	unsigned int	slab_flags;
	unsigned int	gfp_mask;
};

static struct scsi_host_cmd_pool scsi_cmd_pool = {
	.name		= "scsi_cmd_cache",
	.slab_flags	= SLAB_HWCACHE_ALIGN,
};

static struct scsi_host_cmd_pool scsi_cmd_dma_pool = {
	.name		= "scsi_cmd_cache(DMA)",
	.slab_flags	= SLAB_HWCACHE_ALIGN|SLAB_CACHE_DMA,
	.gfp_mask	= __GFP_DMA,
};

static DECLARE_MUTEX(host_cmd_pool_mutex);

static struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *shost,
					    int gfp_mask)
{
	struct scsi_cmnd *cmd;

	cmd = kmem_cache_alloc(shost->cmd_pool->slab,
			gfp_mask | shost->cmd_pool->gfp_mask);

	if (unlikely(!cmd)) {
		unsigned long flags;

		spin_lock_irqsave(&shost->free_list_lock, flags);
		if (likely(!list_empty(&shost->free_list))) {
			cmd = list_entry(shost->free_list.next,
					 struct scsi_cmnd, list);
			list_del_init(&cmd->list);
		}
		spin_unlock_irqrestore(&shost->free_list_lock, flags);
	}

	return cmd;
}

/*
 * Function:	scsi_get_command()
 *
 * Purpose:	Allocate and setup a scsi command block
 *
 * Arguments:	dev	- parent scsi device
 *		gfp_mask- allocator flags
 *
 * Returns:	The allocated scsi command structure.
 */
struct scsi_cmnd *scsi_get_command(struct scsi_device *dev, int gfp_mask)
{
	struct scsi_cmnd *cmd;

	/* Bail if we can't get a reference to the device */
	if (!get_device(&dev->sdev_gendev))
		return NULL;

	cmd = __scsi_get_command(dev->host, gfp_mask);

	if (likely(cmd != NULL)) {
		unsigned long flags;

		memset(cmd, 0, sizeof(*cmd));
		cmd->device = dev;
		init_timer(&cmd->eh_timeout);
		INIT_LIST_HEAD(&cmd->list);
		spin_lock_irqsave(&dev->list_lock, flags);
		list_add_tail(&cmd->list, &dev->cmd_list);
		spin_unlock_irqrestore(&dev->list_lock, flags);
	} else
		put_device(&dev->sdev_gendev);

	return cmd;
}				
EXPORT_SYMBOL(scsi_get_command);

/*
 * Function:	scsi_put_command()
 *
 * Purpose:	Free a scsi command block
 *
 * Arguments:	cmd	- command block to free
 *
 * Returns:	Nothing.
 *
 * Notes:	The command must not belong to any lists.
 */
void scsi_put_command(struct scsi_cmnd *cmd)
{
	struct scsi_device *sdev = cmd->device;
	struct Scsi_Host *shost = sdev->host;
	unsigned long flags;
	
	/* serious error if the command hasn't come from a device list */
	spin_lock_irqsave(&cmd->device->list_lock, flags);
	BUG_ON(list_empty(&cmd->list));
	list_del_init(&cmd->list);
	spin_unlock(&cmd->device->list_lock);
	/* changing locks here, don't need to restore the irq state */
	spin_lock(&shost->free_list_lock);
	if (unlikely(list_empty(&shost->free_list))) {
		list_add(&cmd->list, &shost->free_list);
		cmd = NULL;
	}
	spin_unlock_irqrestore(&shost->free_list_lock, flags);

	if (likely(cmd != NULL))
		kmem_cache_free(shost->cmd_pool->slab, cmd);

	put_device(&sdev->sdev_gendev);
}
EXPORT_SYMBOL(scsi_put_command);

/*
 * Function:	scsi_setup_command_freelist()
 *
 * Purpose:	Setup the command freelist for a scsi host.
 *
 * Arguments:	shost	- host to allocate the freelist for.
 *
 * Returns:	Nothing.
 */
int scsi_setup_command_freelist(struct Scsi_Host *shost)
{
	struct scsi_host_cmd_pool *pool;
	struct scsi_cmnd *cmd;

	spin_lock_init(&shost->free_list_lock);
	INIT_LIST_HEAD(&shost->free_list);

	/*
	 * Select a command slab for this host and create it if not
	 * yet existant.
	 */
	down(&host_cmd_pool_mutex);
	pool = (shost->unchecked_isa_dma ? &scsi_cmd_dma_pool : &scsi_cmd_pool);
	if (!pool->users) {
		pool->slab = kmem_cache_create(pool->name,
				sizeof(struct scsi_cmnd), 0,
				pool->slab_flags, NULL, NULL);
		if (!pool->slab)
			goto fail;
	}

	pool->users++;
	shost->cmd_pool = pool;
	up(&host_cmd_pool_mutex);

	/*
	 * Get one backup command for this host.
	 */
	cmd = kmem_cache_alloc(shost->cmd_pool->slab,
			GFP_KERNEL | shost->cmd_pool->gfp_mask);
	if (!cmd)
		goto fail2;
	list_add(&cmd->list, &shost->free_list);		
	return 0;

 fail2:
	if (!--pool->users)
		kmem_cache_destroy(pool->slab);
	return -ENOMEM;
 fail:
	up(&host_cmd_pool_mutex);
	return -ENOMEM;

}

/*
 * Function:	scsi_destroy_command_freelist()
 *
 * Purpose:	Release the command freelist for a scsi host.
 *
 * Arguments:	shost	- host that's freelist is going to be destroyed
 */
void scsi_destroy_command_freelist(struct Scsi_Host *shost)
{
	while (!list_empty(&shost->free_list)) {
		struct scsi_cmnd *cmd;

		cmd = list_entry(shost->free_list.next, struct scsi_cmnd, list);
		list_del_init(&cmd->list);
		kmem_cache_free(shost->cmd_pool->slab, cmd);
	}

	down(&host_cmd_pool_mutex);
	if (!--shost->cmd_pool->users)
		kmem_cache_destroy(shost->cmd_pool->slab);
	up(&host_cmd_pool_mutex);
}

#ifdef CONFIG_SCSI_LOGGING
void scsi_log_send(struct scsi_cmnd *cmd)
{
	unsigned int level;
	struct scsi_device *sdev;

	/*
	 * If ML QUEUE log level is greater than or equal to:
	 *
	 * 1: nothing (match completion)
	 *
	 * 2: log opcode + command of all commands
	 *
	 * 3: same as 2 plus dump cmd address
	 *
	 * 4: same as 3 plus dump extra junk
	 */
	if (unlikely(scsi_logging_level)) {
		level = SCSI_LOG_LEVEL(SCSI_LOG_MLQUEUE_SHIFT,
				       SCSI_LOG_MLQUEUE_BITS);
		if (level > 1) {
			sdev = cmd->device;
			printk(KERN_INFO "scsi <%d:%d:%d:%d> send ",
			       sdev->host->host_no, sdev->channel, sdev->id,
			       sdev->lun);
			if (level > 2)
				printk("0x%p ", cmd);
			/*
			 * spaces to match disposition and cmd->result
			 * output in scsi_log_completion.
			 */
			printk("                 ");
			scsi_print_command(cmd);
			if (level > 3) {
				printk(KERN_INFO "buffer = 0x%p, bufflen = %d,"
				       " done = 0x%p, queuecommand 0x%p\n",
					cmd->buffer, cmd->bufflen,
					cmd->done,
					sdev->host->hostt->queuecommand);

			}
		}
	}
}

void scsi_log_completion(struct scsi_cmnd *cmd, int disposition)
{
	unsigned int level;
	struct scsi_device *sdev;

	/*
	 * If ML COMPLETE log level is greater than or equal to:
	 *
	 * 1: log disposition, result, opcode + command, and conditionally
	 * sense data for failures or non SUCCESS dispositions.
	 *
	 * 2: same as 1 but for all command completions.
	 *
	 * 3: same as 2 plus dump cmd address
	 *
	 * 4: same as 3 plus dump extra junk
	 */
	if (unlikely(scsi_logging_level)) {
		level = SCSI_LOG_LEVEL(SCSI_LOG_MLCOMPLETE_SHIFT,
				       SCSI_LOG_MLCOMPLETE_BITS);
		if (((level > 0) && (cmd->result || disposition != SUCCESS)) ||
		    (level > 1)) {
			sdev = cmd->device;
			printk(KERN_INFO "scsi <%d:%d:%d:%d> done ",
			       sdev->host->host_no, sdev->channel, sdev->id,
			       sdev->lun);
			if (level > 2)
				printk("0x%p ", cmd);
			/*
			 * Dump truncated values, so we usually fit within
			 * 80 chars.
			 */
			switch (disposition) {
			case SUCCESS:
				printk("SUCCESS");
				break;
			case NEEDS_RETRY:
				printk("RETRY  ");
				break;
			case ADD_TO_MLQUEUE:
				printk("MLQUEUE");
				break;
			case FAILED:
				printk("FAILED ");
				break;
			case TIMEOUT_ERROR:
				/* 
				 * If called via scsi_times_out.
				 */
				printk("TIMEOUT");
				break;
			default:
				printk("UNKNOWN");
			}
			printk(" %8x ", cmd->result);
			scsi_print_command(cmd);
			if (status_byte(cmd->result) & CHECK_CONDITION) {
				/*
				 * XXX The scsi_print_sense formatting/prefix
				 * doesn't match this function.
				 */
				scsi_print_sense("", cmd);
			}
			if (level > 3) {
				printk(KERN_INFO "scsi host busy %d failed %d\n",
				       sdev->host->host_busy,
				       sdev->host->host_failed);
			}
		}
	}
}
#endif

/* 
 * Assign a serial number and pid to the request for error recovery
 * and debugging purposes.  Protected by the Host_Lock of host.
 */
static inline void scsi_cmd_get_serial(struct Scsi_Host *host, struct scsi_cmnd *cmd)
{
	cmd->serial_number = host->cmd_serial_number++;
	if (cmd->serial_number == 0) 
		cmd->serial_number = host->cmd_serial_number++;
	
	cmd->pid = host->cmd_pid++;
	if (cmd->pid == 0)
		cmd->pid = host->cmd_pid++;
}

/*
 * Function:    scsi_dispatch_command
 *
 * Purpose:     Dispatch a command to the low-level driver.
 *
 * Arguments:   cmd - command block we are dispatching.
 *
 * Notes:
 */
int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
{
	struct Scsi_Host *host = cmd->device->host;
	unsigned long flags = 0;
	unsigned long timeout;
	int rtn = 0;

	/* check if the device is still usable */
	if (unlikely(cmd->device->sdev_state == SDEV_DEL)) {
		/* in SDEV_DEL we error all commands. DID_NO_CONNECT
		 * returns an immediate error upwards, and signals
		 * that the device is no longer present */
		cmd->result = DID_NO_CONNECT << 16;
		atomic_inc(&cmd->device->iorequest_cnt);
		__scsi_done(cmd);
		/* return 0 (because the command has been processed) */
		goto out;
	}

	/* Check to see if the scsi lld put this device into state SDEV_BLOCK. */
	if (unlikely(cmd->device->sdev_state == SDEV_BLOCK)) {
		/* 
		 * in SDEV_BLOCK, the command is just put back on the device
		 * queue.  The suspend state has already blocked the queue so
		 * future requests should not occur until the device 
		 * transitions out of the suspend state.
		 */
		scsi_queue_insert(cmd, SCSI_MLQUEUE_DEVICE_BUSY);

		SCSI_LOG_MLQUEUE(3, printk("queuecommand : device blocked \n"));

		/*
		 * NOTE: rtn is still zero here because we don't need the
		 * queue to be plugged on return (it's already stopped)
		 */
		goto out;
	}

	/* 
	 * If SCSI-2 or lower, store the LUN value in cmnd.
	 */
	if (cmd->device->scsi_level <= SCSI_2) {
		cmd->cmnd[1] = (cmd->cmnd[1] & 0x1f) |
			       (cmd->device->lun << 5 & 0xe0);
	}

	/*
	 * We will wait MIN_RESET_DELAY clock ticks after the last reset so
	 * we can avoid the drive not being ready.
	 */
	timeout = host->last_reset + MIN_RESET_DELAY;

	if (host->resetting && time_before(jiffies, timeout)) {
		int ticks_remaining = timeout - jiffies;
		/*
		 * NOTE: This may be executed from within an interrupt
		 * handler!  This is bad, but for now, it'll do.  The irq
		 * level of the interrupt handler has been masked out by the
		 * platform dependent interrupt handling code already, so the
		 * sti() here will not cause another call to the SCSI host's
		 * interrupt handler (assuming there is one irq-level per
		 * host).
		 */
		while (--ticks_remaining >= 0)
			mdelay(1 + 999 / HZ);
		host->resetting = 0;
	}

	/* 
	 * AK: unlikely race here: for some reason the timer could
	 * expire before the serial number is set up below.
	 */
	scsi_add_timer(cmd, cmd->timeout_per_command, scsi_times_out);

	scsi_log_send(cmd);

	/*
	 * We will use a queued command if possible, otherwise we will
	 * emulate the queuing and calling of completion function ourselves.
	 */
	atomic_inc(&cmd->device->iorequest_cnt);

	/*
	 * Before we queue this command, check if the command
	 * length exceeds what the host adapter can handle.
	 */
	if (CDB_SIZE(cmd) > cmd->device->host->max_cmd_len) {
		SCSI_LOG_MLQUEUE(3,
				printk("queuecommand : command too long.\n"));
		cmd->result = (DID_ABORT << 16);

		scsi_done(cmd);
		goto out;
	}

	spin_lock_irqsave(host->host_lock, flags);
	scsi_cmd_get_serial(host, cmd); 

	if (unlikely(test_bit(SHOST_CANCEL, &host->shost_state))) {
		cmd->result = (DID_NO_CONNECT << 16);
		scsi_done(cmd);
	} else {
		rtn = host->hostt->queuecommand(cmd, scsi_done);
	}
	spin_unlock_irqrestore(host->host_lock, flags);
	if (rtn) {
		if (scsi_delete_timer(cmd)) {
			atomic_inc(&cmd->device->iodone_cnt);
			scsi_queue_insert(cmd,
					  (rtn == SCSI_MLQUEUE_DEVICE_BUSY) ?
					  rtn : SCSI_MLQUEUE_HOST_BUSY);
		}
		SCSI_LOG_MLQUEUE(3,
		    printk("queuecommand : request rejected\n"));
	}

 out:
	SCSI_LOG_MLQUEUE(3, printk("leaving scsi_dispatch_cmnd()\n"));
	return rtn;
}

/*
 * Function:    scsi_init_cmd_from_req
 *
 * Purpose:     Queue a SCSI command
 * Purpose:     Initialize a struct scsi_cmnd from a struct scsi_request
 *
 * Arguments:   cmd       - command descriptor.
 *              sreq      - Request from the queue.
 *
 * Lock status: None needed.
 *
 * Returns:     Nothing.
 *
 * Notes:       Mainly transfer data from the request structure to the
 *              command structure.  The request structure is allocated
 *              using the normal memory allocator, and requests can pile
 *              up to more or less any depth.  The command structure represents
 *              a consumable resource, as these are allocated into a pool
 *              when the SCSI subsystem initializes.  The preallocation is
 *              required so that in low-memory situations a disk I/O request
 *              won't cause the memory manager to try and write out a page.
 *              The request structure is generally used by ioctls and character
 *              devices.
 */
void scsi_init_cmd_from_req(struct scsi_cmnd *cmd, struct scsi_request *sreq)
{
	sreq->sr_command = cmd;

	cmd->cmd_len = sreq->sr_cmd_len;
	cmd->use_sg = sreq->sr_use_sg;

	cmd->request = sreq->sr_request;
	memcpy(cmd->data_cmnd, sreq->sr_cmnd, sizeof(cmd->data_cmnd));
	cmd->serial_number = 0;
	cmd->bufflen = sreq->sr_bufflen;
	cmd->buffer = sreq->sr_buffer;
	cmd->retries = 0;
	cmd->allowed = sreq->sr_allowed;
	cmd->done = sreq->sr_done;
	cmd->timeout_per_command = sreq->sr_timeout_per_command;
	cmd->sc_data_direction = sreq->sr_data_direction;
	cmd->sglist_len = sreq->sr_sglist_len;
	cmd->underflow = sreq->sr_underflow;
	cmd->sc_request = sreq;
	memcpy(cmd->cmnd, sreq->sr_cmnd, sizeof(sreq->sr_cmnd));

	/*
	 * Zero the sense buffer.  Some host adapters automatically request
	 * sense on error.  0 is not a valid sense code.
	 */
	memset(cmd->sense_buffer, 0, sizeof(sreq->sr_sense_buffer));
	cmd->request_buffer = sreq->sr_buffer;
	cmd->request_bufflen = sreq->sr_bufflen;
	cmd->old_use_sg = cmd->use_sg;
	if (cmd->cmd_len == 0)
		cmd->cmd_len = COMMAND_SIZE(cmd->cmnd[0]);
	cmd->old_cmd_len = cmd->cmd_len;
	cmd->sc_old_data_direction = cmd->sc_data_direction;
	cmd->old_underflow = cmd->underflow;

	/*
	 * Start the timer ticking.
	 */
	cmd->result = 0;

	SCSI_LOG_MLQUEUE(3, printk("Leaving scsi_init_cmd_from_req()\n"));
}

/*
 * Per-CPU I/O completion queue.
 */
static DEFINE_PER_CPU(struct list_head, scsi_done_q);

/**
 * scsi_done - Enqueue the finished SCSI command into the done queue.
 * @cmd: The SCSI Command for which a low-level device driver (LLDD) gives
 * ownership back to SCSI Core -- i.e. the LLDD has finished with it.
 *
 * This function is the mid-level's (SCSI Core) interrupt routine, which
 * regains ownership of the SCSI command (de facto) from a LLDD, and enqueues
 * the command to the done queue for further processing.
 *
 * This is the producer of the done queue who enqueues at the tail.
 *
 * This function is interrupt context safe.
 */
static void scsi_done(struct scsi_cmnd *cmd)
{
	/*
	 * We don't have to worry about this one timing out any more.
	 * If we are unable to remove the timer, then the command
	 * has already timed out.  In which case, we have no choice but to
	 * let the timeout function run, as we have no idea where in fact
	 * that function could really be.  It might be on another processor,
	 * etc, etc.
	 */
	if (!scsi_delete_timer(cmd))
		return;
	__scsi_done(cmd);
}

/* Private entry to scsi_done() to complete a command when the timer
 * isn't running --- used by scsi_times_out */
void __scsi_done(struct scsi_cmnd *cmd)
{
	unsigned long flags;

	/*
	 * Set the serial numbers back to zero
	 */
	cmd->serial_number = 0;

	atomic_inc(&cmd->device->iodone_cnt);
	if (cmd->result)
		atomic_inc(&cmd->device->ioerr_cnt);

	/*
	 * Next, enqueue the command into the done queue.
	 * It is a per-CPU queue, so we just disable local interrupts
	 * and need no spinlock.
	 */
	local_irq_save(flags);
	list_add_tail(&cmd->eh_entry, &__get_cpu_var(scsi_done_q));
	raise_softirq_irqoff(SCSI_SOFTIRQ);
	local_irq_restore(flags);
}

/**
 * scsi_softirq - Perform post-interrupt processing of finished SCSI commands.
 *
 * This is the consumer of the done queue.
 *
 * This is called with all interrupts enabled.  This should reduce
 * interrupt latency, stack depth, and reentrancy of the low-level
 * drivers.
 */
static void scsi_softirq(struct softirq_action *h)
{
	int disposition;
	LIST_HEAD(local_q);

	local_irq_disable();
	list_splice_init(&__get_cpu_var(scsi_done_q), &local_q);
	local_irq_enable();

	while (!list_empty(&local_q)) {
		struct scsi_cmnd *cmd = list_entry(local_q.next,
						   struct scsi_cmnd, eh_entry);
		list_del_init(&cmd->eh_entry);

		disposition = scsi_decide_disposition(cmd);
		scsi_log_completion(cmd, disposition);
		switch (disposition) {
		case SUCCESS:
			scsi_finish_command(cmd);
			break;
		case NEEDS_RETRY:
			scsi_retry_command(cmd);
			break;
		case ADD_TO_MLQUEUE:
			scsi_queue_insert(cmd, SCSI_MLQUEUE_DEVICE_BUSY);
			break;
		default:
			if (!scsi_eh_scmd_add(cmd, 0))
				scsi_finish_command(cmd);
		}
	}
}

/*
 * Function:    scsi_retry_command
 *
 * Purpose:     Send a command back to the low level to be retried.
 *
 * Notes:       This command is always executed in the context of the
 *              bottom half handler, or the error handler thread. Low
 *              level drivers should not become re-entrant as a result of
 *              this.
 */
static int scsi_retry_command(struct scsi_cmnd *cmd)
{
	/*
	 * Restore the SCSI command state.
	 */
	scsi_setup_cmd_retry(cmd);

        /*
         * Zero the sense information from the last time we tried
         * this command.
         */
	memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));

	return scsi_queue_insert(cmd, SCSI_MLQUEUE_EH_RETRY);
}

/*
 * Function:    scsi_finish_command
 *
 * Purpose:     Pass command off to upper layer for finishing of I/O
 *              request, waking processes that are waiting on results,
 *              etc.
 */
void scsi_finish_command(struct scsi_cmnd *cmd)
{
	struct scsi_device *sdev = cmd->device;
	struct Scsi_Host *shost = sdev->host;
	struct scsi_request *sreq;

	scsi_device_unbusy(sdev);

        /*
         * Clear the flags which say that the device/host is no longer
         * capable of accepting new commands.  These are set in scsi_queue.c
         * for both the queue full condition on a device, and for a
         * host full condition on the host.
	 *
	 * XXX(hch): What about locking?
         */
        shost->host_blocked = 0;
        sdev->device_blocked = 0;

	/*
	 * If we have valid sense information, then some kind of recovery
	 * must have taken place.  Make a note of this.
	 */
	if (SCSI_SENSE_VALID(cmd))
		cmd->result |= (DRIVER_SENSE << 24);

	SCSI_LOG_MLCOMPLETE(4, printk("Notifying upper driver of completion "
				"for device %d %x\n", sdev->id, cmd->result));

	/*
	 * We can get here with use_sg=0, causing a panic in the upper level
	 */
	cmd->use_sg = cmd->old_use_sg;

	/*
	 * If there is an associated request structure, copy the data over
	 * before we call the completion function.
	 */
	sreq = cmd->sc_request;
	if (sreq) {
	       sreq->sr_result = sreq->sr_command->result;
	       if (sreq->sr_result) {
		       memcpy(sreq->sr_sense_buffer,
			      sreq->sr_command->sense_buffer,
			      sizeof(sreq->sr_sense_buffer));
	       }
	}

	cmd->done(cmd);
}
EXPORT_SYMBOL(scsi_finish_command);

/*
 * Function:	scsi_adjust_queue_depth()
 *
 * Purpose:	Allow low level drivers to tell us to change the queue depth
 * 		on a specific SCSI device
 *
 * Arguments:	sdev	- SCSI Device in question
 * 		tagged	- Do we use tagged queueing (non-0) or do we treat
 * 			  this device as an untagged device (0)
 * 		tags	- Number of tags allowed if tagged queueing enabled,
 * 			  or number of commands the low level driver can
 * 			  queue up in non-tagged mode (as per cmd_per_lun).
 *
 * Returns:	Nothing
 *
 * Lock Status:	None held on entry
 *
 * Notes:	Low level drivers may call this at any time and we will do
 * 		the right thing depending on whether or not the device is
 * 		currently active and whether or not it even has the
 * 		command blocks built yet.
 */
void scsi_adjust_queue_depth(struct scsi_device *sdev, int tagged, int tags)
{
	unsigned long flags;

	/*
	 * refuse to set tagged depth to an unworkable size
	 */
	if (tags <= 0)
		return;

	spin_lock_irqsave(sdev->request_queue->queue_lock, flags);

	/* Check to see if the queue is managed by the block layer
	 * if it is, and we fail to adjust the depth, exit */
	if (blk_queue_tagged(sdev->request_queue) &&
	    blk_queue_resize_tags(sdev->request_queue, tags) != 0)
		goto out;

	sdev->queue_depth = tags;
	switch (tagged) {
		case MSG_ORDERED_TAG:
			sdev->ordered_tags = 1;
			sdev->simple_tags = 1;
			break;
		case MSG_SIMPLE_TAG:
			sdev->ordered_tags = 0;
			sdev->simple_tags = 1;
			break;
		default:
			printk(KERN_WARNING "(scsi%d:%d:%d:%d) "
				"scsi_adjust_queue_depth, bad queue type, "
				"disabled\n", sdev->host->host_no,
				sdev->channel, sdev->id, sdev->lun); 
		case 0:
			sdev->ordered_tags = sdev->simple_tags = 0;
			sdev->queue_depth = tags;
			break;
	}
 out:
	spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
}
EXPORT_SYMBOL(scsi_adjust_queue_depth);

/*
 * Function:	scsi_track_queue_full()
 *
 * Purpose:	This function will track successive QUEUE_FULL events on a
 * 		specific SCSI device to determine if and when there is a
 * 		need to adjust the queue depth on the device.
 *
 * Arguments:	sdev	- SCSI Device in question
 * 		depth	- Current number of outstanding SCSI commands on
 * 			  this device, not counting the one returned as
 * 			  QUEUE_FULL.
 *
 * Returns:	0 - No change needed
 * 		>0 - Adjust queue depth to this new depth
 * 		-1 - Drop back to untagged operation using host->cmd_per_lun
 * 			as the untagged command depth
 *
 * Lock Status:	None held on entry
 *
 * Notes:	Low level drivers may call this at any time and we will do
 * 		"The Right Thing."  We are interrupt context safe.
 */
int scsi_track_queue_full(struct scsi_device *sdev, int depth)
{
	if ((jiffies >> 4) == sdev->last_queue_full_time)
		return 0;

	sdev->last_queue_full_time = (jiffies >> 4);
	if (sdev->last_queue_full_depth != depth) {
		sdev->last_queue_full_count = 1;
		sdev->last_queue_full_depth = depth;
	} else {
		sdev->last_queue_full_count++;
	}

	if (sdev->last_queue_full_count <= 10)
		return 0;
	if (sdev->last_queue_full_depth < 8) {
		/* Drop back to untagged */
		scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
		return -1;
	}
	
	if (sdev->ordered_tags)
		scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG, depth);
	else
		scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
	return depth;
}
EXPORT_SYMBOL(scsi_track_queue_full);

/**
 * scsi_device_get  -  get an addition reference to a scsi_device
 * @sdev:	device to get a reference to
 *
 * Gets a reference to the scsi_device and increments the use count
 * of the underlying LLDD module.  You must hold host_lock of the
 * parent Scsi_Host or already have a reference when calling this.
 */
int scsi_device_get(struct scsi_device *sdev)
{
	if (sdev->sdev_state == SDEV_DEL || sdev->sdev_state == SDEV_CANCEL)
		return -ENXIO;
	if (!get_device(&sdev->sdev_gendev))
		return -ENXIO;
	if (!try_module_get(sdev->host->hostt->module)) {
		put_device(&sdev->sdev_gendev);
		return -ENXIO;
	}
	return 0;
}
EXPORT_SYMBOL(scsi_device_get);

/**
 * scsi_device_put  -  release a reference to a scsi_device
 * @sdev:	device to release a reference on.
 *
 * Release a reference to the scsi_device and decrements the use count
 * of the underlying LLDD module.  The device is freed once the last
 * user vanishes.
 */
void scsi_device_put(struct scsi_device *sdev)
{
	module_put(sdev->host->hostt->module);
	put_device(&sdev->sdev_gendev);
}
EXPORT_SYMBOL(scsi_device_put);

/* helper for shost_for_each_device, thus not documented */
struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *shost,
					   struct scsi_device *prev)
{
	struct list_head *list = (prev ? &prev->siblings : &shost->__devices);
	struct scsi_device *next = NULL;
	unsigned long flags;

	spin_lock_irqsave(shost->host_lock, flags);
	while (list->next != &shost->__devices) {
		next = list_entry(list->next, struct scsi_device, siblings);
		/* skip devices that we can't get a reference to */
		if (!scsi_device_get(next))
			break;
		next = NULL;
		list = list->next;
	}
	spin_unlock_irqrestore(shost->host_lock, flags);

	if (prev)
		scsi_device_put(prev);
	return next;
}
EXPORT_SYMBOL(__scsi_iterate_devices);

/**
 * starget_for_each_device  -  helper to walk all devices of a target
 * @starget:	target whose devices we want to iterate over.
 *
 * This traverses over each devices of @shost.  The devices have
 * a reference that must be released by scsi_host_put when breaking
 * out of the loop.
 */
void starget_for_each_device(struct scsi_target *starget, void * data,
		     void (*fn)(struct scsi_device *, void *))
{
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
	struct scsi_device *sdev;

	shost_for_each_device(sdev, shost) {
		if ((sdev->channel == starget->channel) &&
		    (sdev->id == starget->id))
			fn(sdev, data);
	}
}
EXPORT_SYMBOL(starget_for_each_device);

/**
 * __scsi_device_lookup_by_target - find a device given the target (UNLOCKED)
 * @starget:	SCSI target pointer
 * @lun:	SCSI Logical Unit Number
 *
 * Looks up the scsi_device with the specified @lun for a give
 * @starget. The returned scsi_device does not have an additional
 * reference.  You must hold the host's host_lock over this call and
 * any access to the returned scsi_device.
 *
 * Note:  The only reason why drivers would want to use this is because
 * they're need to access the device list in irq context.  Otherwise you
 * really want to use scsi_device_lookup_by_target instead.
 **/
struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *starget,
						   uint lun)
{
	struct scsi_device *sdev;

	list_for_each_entry(sdev, &starget->devices, same_target_siblings) {
		if (sdev->lun ==lun)
			return sdev;
	}

	return NULL;
}
EXPORT_SYMBOL(__scsi_device_lookup_by_target);

/**
 * scsi_device_lookup_by_target - find a device given the target
 * @starget:	SCSI target pointer
 * @lun:	SCSI Logical Unit Number
 *
 * Looks up the scsi_device with the specified @channel, @id, @lun for a
 * give host.  The returned scsi_device has an additional reference that
 * needs to be release with scsi_host_put once you're done with it.
 **/
struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *starget,
						 uint lun)
{
	struct scsi_device *sdev;
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
	unsigned long flags;

	spin_lock_irqsave(shost->host_lock, flags);
	sdev = __scsi_device_lookup_by_target(starget, lun);
	if (sdev && scsi_device_get(sdev))
		sdev = NULL;
	spin_unlock_irqrestore(shost->host_lock, flags);

	return sdev;
}
EXPORT_SYMBOL(scsi_device_lookup_by_target);

/**
 * scsi_device_lookup - find a device given the host (UNLOCKED)
 * @shost:	SCSI host pointer
 * @channel:	SCSI channel (zero if only one channel)
 * @pun:	SCSI target number (physical unit number)
 * @lun:	SCSI Logical Unit Number
 *
 * Looks up the scsi_device with the specified @channel, @id, @lun for a
 * give host. The returned scsi_device does not have an additional reference.
 * You must hold the host's host_lock over this call and any access to the
 * returned scsi_device.
 *
 * Note:  The only reason why drivers would want to use this is because
 * they're need to access the device list in irq context.  Otherwise you
 * really want to use scsi_device_lookup instead.
 **/
struct scsi_device *__scsi_device_lookup(struct Scsi_Host *shost,
		uint channel, uint id, uint lun)
{
	struct scsi_device *sdev;

	list_for_each_entry(sdev, &shost->__devices, siblings) {
		if (sdev->channel == channel && sdev->id == id &&
				sdev->lun ==lun)
			return sdev;
	}

	return NULL;
}
EXPORT_SYMBOL(__scsi_device_lookup);

/**
 * scsi_device_lookup - find a device given the host
 * @shost:	SCSI host pointer
 * @channel:	SCSI channel (zero if only one channel)
 * @id:		SCSI target number (physical unit number)
 * @lun:	SCSI Logical Unit Number
 *
 * Looks up the scsi_device with the specified @channel, @id, @lun for a
 * give host.  The returned scsi_device has an additional reference that
 * needs to be release with scsi_host_put once you're done with it.
 **/
struct scsi_device *scsi_device_lookup(struct Scsi_Host *shost,
		uint channel, uint id, uint lun)
{
	struct scsi_device *sdev;
	unsigned long flags;

	spin_lock_irqsave(shost->host_lock, flags);
	sdev = __scsi_device_lookup(shost, channel, id, lun);
	if (sdev && scsi_device_get(sdev))
		sdev = NULL;
	spin_unlock_irqrestore(shost->host_lock, flags);

	return sdev;
}
EXPORT_SYMBOL(scsi_device_lookup);

/**
 * scsi_device_cancel - cancel outstanding IO to this device
 * @sdev:	Pointer to struct scsi_device
 * @recovery:	Boolean instructing function to recover device or not.
 *
 **/
int scsi_device_cancel(struct scsi_device *sdev, int recovery)
{
	struct scsi_cmnd *scmd;
	LIST_HEAD(active_list);
	struct list_head *lh, *lh_sf;
	unsigned long flags;

	scsi_device_set_state(sdev, SDEV_CANCEL);

	spin_lock_irqsave(&sdev->list_lock, flags);
	list_for_each_entry(scmd, &sdev->cmd_list, list) {
		if (scmd->request && scmd->request->rq_status != RQ_INACTIVE) {
			/*
			 * If we are unable to remove the timer, it means
			 * that the command has already timed out or
			 * finished.
			 */
			if (!scsi_delete_timer(scmd))
				continue;
			list_add_tail(&scmd->eh_entry, &active_list);
		}
	}
	spin_unlock_irqrestore(&sdev->list_lock, flags);

	if (!list_empty(&active_list)) {
		list_for_each_safe(lh, lh_sf, &active_list) {
			scmd = list_entry(lh, struct scsi_cmnd, eh_entry);
			list_del_init(lh);
			if (recovery) {
				scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD);
			} else {
				scmd->result = (DID_ABORT << 16);
				scsi_finish_command(scmd);
			}
		}
	}

	return 0;
}
EXPORT_SYMBOL(scsi_device_cancel);

#ifdef CONFIG_HOTPLUG_CPU
static int scsi_cpu_notify(struct notifier_block *self,
			   unsigned long action, void *hcpu)
{
	int cpu = (unsigned long)hcpu;

	switch(action) {
	case CPU_DEAD:
		/* Drain scsi_done_q. */
		local_irq_disable();
		list_splice_init(&per_cpu(scsi_done_q, cpu),
				 &__get_cpu_var(scsi_done_q));
		raise_softirq_irqoff(SCSI_SOFTIRQ);
		local_irq_enable();
		break;
	default:
		break;
	}
	return NOTIFY_OK;
}

static struct notifier_block __devinitdata scsi_cpu_nb = {
	.notifier_call	= scsi_cpu_notify,
};

#define register_scsi_cpu() register_cpu_notifier(&scsi_cpu_nb)
#define unregister_scsi_cpu() unregister_cpu_notifier(&scsi_cpu_nb)
#else
#define register_scsi_cpu()
#define unregister_scsi_cpu()
#endif /* CONFIG_HOTPLUG_CPU */

MODULE_DESCRIPTION("SCSI core");
MODULE_LICENSE("GPL");

module_param(scsi_logging_level, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(scsi_logging_level, "a bit mask of logging levels");

static int __init init_scsi(void)
{
	int error, i;

	error = scsi_init_queue();
	if (error)
		return error;
	error = scsi_init_procfs();
	if (error)
		goto cleanup_queue;
	error = scsi_init_devinfo();
	if (error)
		goto cleanup_procfs;
	error = scsi_init_hosts();
	if (error)
		goto cleanup_devlist;
	error = scsi_init_sysctl();
	if (error)
		goto cleanup_hosts;
	error = scsi_sysfs_register();
	if (error)
		goto cleanup_sysctl;

	for (i = 0; i < NR_CPUS; i++)
		INIT_LIST_HEAD(&per_cpu(scsi_done_q, i));

	devfs_mk_dir("scsi");
	open_softirq(SCSI_SOFTIRQ, scsi_softirq, NULL);
	register_scsi_cpu();
	printk(KERN_NOTICE "SCSI subsystem initialized\n");
	return 0;

cleanup_sysctl:
	scsi_exit_sysctl();
cleanup_hosts:
	scsi_exit_hosts();
cleanup_devlist:
	scsi_exit_devinfo();
cleanup_procfs:
	scsi_exit_procfs();
cleanup_queue:
	scsi_exit_queue();
	printk(KERN_ERR "SCSI subsystem failed to initialize, error = %d\n",
	       -error);
	return error;
}

static void __exit exit_scsi(void)
{
	scsi_sysfs_unregister();
	scsi_exit_sysctl();
	scsi_exit_hosts();
	scsi_exit_devinfo();
	devfs_remove("scsi");
	scsi_exit_procfs();
	scsi_exit_queue();
	unregister_scsi_cpu();
}

subsys_initcall(init_scsi);
module_exit(exit_scsi);