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authorChandra Seetharaman <sekharan@us.ibm.com>2008-05-01 17:50:34 -0400
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-06-05 10:23:41 -0400
commitcb520223d7f22c5386aff27a5856a66e2c32aaac (patch)
tree850268071c54a99e4099de6875bad15d436781ab
parent2651f5d7d3bc5120a439e498f131e4d731f99b3e (diff)
[SCSI] scsi_dh: Remove hardware handlers from dm
This patch removes the 3 hardware handlers that currently exist under dm as the functionality is moved to SCSI layer in the earlier patches. [jejb: removed more makefile hunks and rejection fixes] Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com> Acked-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat
-rw-r--r--drivers/md/Kconfig18
-rw-r--r--drivers/md/Makefile5
-rw-r--r--drivers/md/dm-emc.c345
-rw-r--r--drivers/md/dm-mpath-hp-sw.c247
-rw-r--r--drivers/md/dm-mpath-rdac.c700
5 files changed, 0 insertions, 1315 deletions
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
index 5303af55d2c7..b4a3c7d1451d 100644
--- a/drivers/md/Kconfig
+++ b/drivers/md/Kconfig
@@ -256,24 +256,6 @@ config DM_MULTIPATH
256 ---help--- 256 ---help---
257 Allow volume managers to support multipath hardware. 257 Allow volume managers to support multipath hardware.
258 258
259config DM_MULTIPATH_EMC
260 tristate "EMC CX/AX multipath support"
261 depends on DM_MULTIPATH && BLK_DEV_DM
262 ---help---
263 Multipath support for EMC CX/AX series hardware.
264
265config DM_MULTIPATH_RDAC
266 tristate "LSI/Engenio RDAC multipath support (EXPERIMENTAL)"
267 depends on DM_MULTIPATH && BLK_DEV_DM && SCSI && EXPERIMENTAL
268 ---help---
269 Multipath support for LSI/Engenio RDAC.
270
271config DM_MULTIPATH_HP
272 tristate "HP MSA multipath support (EXPERIMENTAL)"
273 depends on DM_MULTIPATH && BLK_DEV_DM && SCSI && EXPERIMENTAL
274 ---help---
275 Multipath support for HP MSA (Active/Passive) series hardware.
276
277config DM_DELAY 259config DM_DELAY
278 tristate "I/O delaying target (EXPERIMENTAL)" 260 tristate "I/O delaying target (EXPERIMENTAL)"
279 depends on BLK_DEV_DM && EXPERIMENTAL 261 depends on BLK_DEV_DM && EXPERIMENTAL
diff --git a/drivers/md/Makefile b/drivers/md/Makefile
index 7be09eeea293..62e141e86d6f 100644
--- a/drivers/md/Makefile
+++ b/drivers/md/Makefile
@@ -7,8 +7,6 @@ dm-mod-objs := dm.o dm-table.o dm-target.o dm-linear.o dm-stripe.o \
7dm-multipath-objs := dm-hw-handler.o dm-path-selector.o dm-mpath.o 7dm-multipath-objs := dm-hw-handler.o dm-path-selector.o dm-mpath.o
8dm-snapshot-objs := dm-snap.o dm-exception-store.o 8dm-snapshot-objs := dm-snap.o dm-exception-store.o
9dm-mirror-objs := dm-raid1.o 9dm-mirror-objs := dm-raid1.o
10dm-rdac-objs := dm-mpath-rdac.o
11dm-hp-sw-objs := dm-mpath-hp-sw.o
12md-mod-objs := md.o bitmap.o 10md-mod-objs := md.o bitmap.o
13raid456-objs := raid5.o raid6algos.o raid6recov.o raid6tables.o \ 11raid456-objs := raid5.o raid6algos.o raid6recov.o raid6tables.o \
14 raid6int1.o raid6int2.o raid6int4.o \ 12 raid6int1.o raid6int2.o raid6int4.o \
@@ -35,9 +33,6 @@ obj-$(CONFIG_BLK_DEV_DM) += dm-mod.o
35obj-$(CONFIG_DM_CRYPT) += dm-crypt.o 33obj-$(CONFIG_DM_CRYPT) += dm-crypt.o
36obj-$(CONFIG_DM_DELAY) += dm-delay.o 34obj-$(CONFIG_DM_DELAY) += dm-delay.o
37obj-$(CONFIG_DM_MULTIPATH) += dm-multipath.o dm-round-robin.o 35obj-$(CONFIG_DM_MULTIPATH) += dm-multipath.o dm-round-robin.o
38obj-$(CONFIG_DM_MULTIPATH_EMC) += dm-emc.o
39obj-$(CONFIG_DM_MULTIPATH_HP) += dm-hp-sw.o
40obj-$(CONFIG_DM_MULTIPATH_RDAC) += dm-rdac.o
41obj-$(CONFIG_DM_SNAPSHOT) += dm-snapshot.o 36obj-$(CONFIG_DM_SNAPSHOT) += dm-snapshot.o
42obj-$(CONFIG_DM_MIRROR) += dm-mirror.o dm-log.o 37obj-$(CONFIG_DM_MIRROR) += dm-mirror.o dm-log.o
43obj-$(CONFIG_DM_ZERO) += dm-zero.o 38obj-$(CONFIG_DM_ZERO) += dm-zero.o
diff --git a/drivers/md/dm-emc.c b/drivers/md/dm-emc.c
deleted file mode 100644
index 3ea5ad4b7805..000000000000
--- a/drivers/md/dm-emc.c
+++ /dev/null
@@ -1,345 +0,0 @@
1/*
2 * Copyright (C) 2004 SUSE LINUX Products GmbH. All rights reserved.
3 * Copyright (C) 2004 Red Hat, Inc. All rights reserved.
4 *
5 * This file is released under the GPL.
6 *
7 * Multipath support for EMC CLARiiON AX/CX-series hardware.
8 */
9
10#include "dm.h"
11#include "dm-hw-handler.h"
12#include <scsi/scsi.h>
13#include <scsi/scsi_cmnd.h>
14
15#define DM_MSG_PREFIX "multipath emc"
16
17struct emc_handler {
18 spinlock_t lock;
19
20 /* Whether we should send the short trespass command (FC-series)
21 * or the long version (default for AX/CX CLARiiON arrays). */
22 unsigned short_trespass;
23 /* Whether or not to honor SCSI reservations when initiating a
24 * switch-over. Default: Don't. */
25 unsigned hr;
26
27 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
28};
29
30#define TRESPASS_PAGE 0x22
31#define EMC_FAILOVER_TIMEOUT (60 * HZ)
32
33/* Code borrowed from dm-lsi-rdac by Mike Christie */
34
35static inline void free_bio(struct bio *bio)
36{
37 __free_page(bio->bi_io_vec[0].bv_page);
38 bio_put(bio);
39}
40
41static void emc_endio(struct bio *bio, int error)
42{
43 struct dm_path *path = bio->bi_private;
44
45 /* We also need to look at the sense keys here whether or not to
46 * switch to the next PG etc.
47 *
48 * For now simple logic: either it works or it doesn't.
49 */
50 if (error)
51 dm_pg_init_complete(path, MP_FAIL_PATH);
52 else
53 dm_pg_init_complete(path, 0);
54
55 /* request is freed in block layer */
56 free_bio(bio);
57}
58
59static struct bio *get_failover_bio(struct dm_path *path, unsigned data_size)
60{
61 struct bio *bio;
62 struct page *page;
63
64 bio = bio_alloc(GFP_ATOMIC, 1);
65 if (!bio) {
66 DMERR("get_failover_bio: bio_alloc() failed.");
67 return NULL;
68 }
69
70 bio->bi_rw |= (1 << BIO_RW);
71 bio->bi_bdev = path->dev->bdev;
72 bio->bi_sector = 0;
73 bio->bi_private = path;
74 bio->bi_end_io = emc_endio;
75
76 page = alloc_page(GFP_ATOMIC);
77 if (!page) {
78 DMERR("get_failover_bio: alloc_page() failed.");
79 bio_put(bio);
80 return NULL;
81 }
82
83 if (bio_add_page(bio, page, data_size, 0) != data_size) {
84 DMERR("get_failover_bio: bio_add_page() failed.");
85 __free_page(page);
86 bio_put(bio);
87 return NULL;
88 }
89
90 return bio;
91}
92
93static struct request *get_failover_req(struct emc_handler *h,
94 struct bio *bio, struct dm_path *path)
95{
96 struct request *rq;
97 struct block_device *bdev = bio->bi_bdev;
98 struct request_queue *q = bdev_get_queue(bdev);
99
100 /* FIXME: Figure out why it fails with GFP_ATOMIC. */
101 rq = blk_get_request(q, WRITE, __GFP_WAIT);
102 if (!rq) {
103 DMERR("get_failover_req: blk_get_request failed");
104 return NULL;
105 }
106
107 blk_rq_append_bio(q, rq, bio);
108
109 rq->sense = h->sense;
110 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
111 rq->sense_len = 0;
112
113 rq->timeout = EMC_FAILOVER_TIMEOUT;
114 rq->cmd_type = REQ_TYPE_BLOCK_PC;
115 rq->cmd_flags |= REQ_FAILFAST | REQ_NOMERGE;
116
117 return rq;
118}
119
120static struct request *emc_trespass_get(struct emc_handler *h,
121 struct dm_path *path)
122{
123 struct bio *bio;
124 struct request *rq;
125 unsigned char *page22;
126 unsigned char long_trespass_pg[] = {
127 0, 0, 0, 0,
128 TRESPASS_PAGE, /* Page code */
129 0x09, /* Page length - 2 */
130 h->hr ? 0x01 : 0x81, /* Trespass code + Honor reservation bit */
131 0xff, 0xff, /* Trespass target */
132 0, 0, 0, 0, 0, 0 /* Reserved bytes / unknown */
133 };
134 unsigned char short_trespass_pg[] = {
135 0, 0, 0, 0,
136 TRESPASS_PAGE, /* Page code */
137 0x02, /* Page length - 2 */
138 h->hr ? 0x01 : 0x81, /* Trespass code + Honor reservation bit */
139 0xff, /* Trespass target */
140 };
141 unsigned data_size = h->short_trespass ? sizeof(short_trespass_pg) :
142 sizeof(long_trespass_pg);
143
144 /* get bio backing */
145 if (data_size > PAGE_SIZE)
146 /* this should never happen */
147 return NULL;
148
149 bio = get_failover_bio(path, data_size);
150 if (!bio) {
151 DMERR("emc_trespass_get: no bio");
152 return NULL;
153 }
154
155 page22 = (unsigned char *)bio_data(bio);
156 memset(page22, 0, data_size);
157
158 memcpy(page22, h->short_trespass ?
159 short_trespass_pg : long_trespass_pg, data_size);
160
161 /* get request for block layer packet command */
162 rq = get_failover_req(h, bio, path);
163 if (!rq) {
164 DMERR("emc_trespass_get: no rq");
165 free_bio(bio);
166 return NULL;
167 }
168
169 /* Prepare the command. */
170 rq->cmd[0] = MODE_SELECT;
171 rq->cmd[1] = 0x10;
172 rq->cmd[4] = data_size;
173 rq->cmd_len = COMMAND_SIZE(rq->cmd[0]);
174
175 return rq;
176}
177
178static void emc_pg_init(struct hw_handler *hwh, unsigned bypassed,
179 struct dm_path *path)
180{
181 struct request *rq;
182 struct request_queue *q = bdev_get_queue(path->dev->bdev);
183
184 /*
185 * We can either blindly init the pg (then look at the sense),
186 * or we can send some commands to get the state here (then
187 * possibly send the fo cmnd), or we can also have the
188 * initial state passed into us and then get an update here.
189 */
190 if (!q) {
191 DMINFO("emc_pg_init: no queue");
192 goto fail_path;
193 }
194
195 /* FIXME: The request should be pre-allocated. */
196 rq = emc_trespass_get(hwh->context, path);
197 if (!rq) {
198 DMERR("emc_pg_init: no rq");
199 goto fail_path;
200 }
201
202 DMINFO("emc_pg_init: sending switch-over command");
203 elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 1);
204 return;
205
206fail_path:
207 dm_pg_init_complete(path, MP_FAIL_PATH);
208}
209
210static struct emc_handler *alloc_emc_handler(void)
211{
212 struct emc_handler *h = kzalloc(sizeof(*h), GFP_KERNEL);
213
214 if (h)
215 spin_lock_init(&h->lock);
216
217 return h;
218}
219
220static int emc_create(struct hw_handler *hwh, unsigned argc, char **argv)
221{
222 struct emc_handler *h;
223 unsigned hr, short_trespass;
224
225 if (argc == 0) {
226 /* No arguments: use defaults */
227 hr = 0;
228 short_trespass = 0;
229 } else if (argc != 2) {
230 DMWARN("incorrect number of arguments");
231 return -EINVAL;
232 } else {
233 if ((sscanf(argv[0], "%u", &short_trespass) != 1)
234 || (short_trespass > 1)) {
235 DMWARN("invalid trespass mode selected");
236 return -EINVAL;
237 }
238
239 if ((sscanf(argv[1], "%u", &hr) != 1)
240 || (hr > 1)) {
241 DMWARN("invalid honor reservation flag selected");
242 return -EINVAL;
243 }
244 }
245
246 h = alloc_emc_handler();
247 if (!h)
248 return -ENOMEM;
249
250 hwh->context = h;
251
252 if ((h->short_trespass = short_trespass))
253 DMWARN("short trespass command will be send");
254 else
255 DMWARN("long trespass command will be send");
256
257 if ((h->hr = hr))
258 DMWARN("honor reservation bit will be set");
259 else
260 DMWARN("honor reservation bit will not be set (default)");
261
262 return 0;
263}
264
265static void emc_destroy(struct hw_handler *hwh)
266{
267 struct emc_handler *h = (struct emc_handler *) hwh->context;
268
269 kfree(h);
270 hwh->context = NULL;
271}
272
273static unsigned emc_error(struct hw_handler *hwh, struct bio *bio)
274{
275 /* FIXME: Patch from axboe still missing */
276#if 0
277 int sense;
278
279 if (bio->bi_error & BIO_SENSE) {
280 sense = bio->bi_error & 0xffffff; /* sense key / asc / ascq */
281
282 if (sense == 0x020403) {
283 /* LUN Not Ready - Manual Intervention Required
284 * indicates this is a passive path.
285 *
286 * FIXME: However, if this is seen and EVPD C0
287 * indicates that this is due to a NDU in
288 * progress, we should set FAIL_PATH too.
289 * This indicates we might have to do a SCSI
290 * inquiry in the end_io path. Ugh. */
291 return MP_BYPASS_PG | MP_RETRY_IO;
292 } else if (sense == 0x052501) {
293 /* An array based copy is in progress. Do not
294 * fail the path, do not bypass to another PG,
295 * do not retry. Fail the IO immediately.
296 * (Actually this is the same conclusion as in
297 * the default handler, but lets make sure.) */
298 return 0;
299 } else if (sense == 0x062900) {
300 /* Unit Attention Code. This is the first IO
301 * to the new path, so just retry. */
302 return MP_RETRY_IO;
303 }
304 }
305#endif
306
307 /* Try default handler */
308 return dm_scsi_err_handler(hwh, bio);
309}
310
311static struct hw_handler_type emc_hwh = {
312 .name = "emc",
313 .module = THIS_MODULE,
314 .create = emc_create,
315 .destroy = emc_destroy,
316 .pg_init = emc_pg_init,
317 .error = emc_error,
318};
319
320static int __init dm_emc_init(void)
321{
322 int r = dm_register_hw_handler(&emc_hwh);
323
324 if (r < 0)
325 DMERR("register failed %d", r);
326
327 DMINFO("version 0.0.3 loaded");
328
329 return r;
330}
331
332static void __exit dm_emc_exit(void)
333{
334 int r = dm_unregister_hw_handler(&emc_hwh);
335
336 if (r < 0)
337 DMERR("unregister failed %d", r);
338}
339
340module_init(dm_emc_init);
341module_exit(dm_emc_exit);
342
343MODULE_DESCRIPTION(DM_NAME " EMC CX/AX/FC-family multipath");
344MODULE_AUTHOR("Lars Marowsky-Bree <lmb@suse.de>");
345MODULE_LICENSE("GPL");
diff --git a/drivers/md/dm-mpath-hp-sw.c b/drivers/md/dm-mpath-hp-sw.c
deleted file mode 100644
index b63a0ab37c53..000000000000
--- a/drivers/md/dm-mpath-hp-sw.c
+++ /dev/null
@@ -1,247 +0,0 @@
1/*
2 * Copyright (C) 2005 Mike Christie, All rights reserved.
3 * Copyright (C) 2007 Red Hat, Inc. All rights reserved.
4 * Authors: Mike Christie
5 * Dave Wysochanski
6 *
7 * This file is released under the GPL.
8 *
9 * This module implements the specific path activation code for
10 * HP StorageWorks and FSC FibreCat Asymmetric (Active/Passive)
11 * storage arrays.
12 * These storage arrays have controller-based failover, not
13 * LUN-based failover. However, LUN-based failover is the design
14 * of dm-multipath. Thus, this module is written for LUN-based failover.
15 */
16#include <linux/blkdev.h>
17#include <linux/list.h>
18#include <linux/types.h>
19#include <scsi/scsi.h>
20#include <scsi/scsi_cmnd.h>
21#include <scsi/scsi_dbg.h>
22
23#include "dm.h"
24#include "dm-hw-handler.h"
25
26#define DM_MSG_PREFIX "multipath hp-sw"
27#define DM_HP_HWH_NAME "hp-sw"
28#define DM_HP_HWH_VER "1.0.0"
29
30struct hp_sw_context {
31 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
32};
33
34/*
35 * hp_sw_error_is_retryable - Is an HP-specific check condition retryable?
36 * @req: path activation request
37 *
38 * Examine error codes of request and determine whether the error is retryable.
39 * Some error codes are already retried by scsi-ml (see
40 * scsi_decide_disposition), but some HP specific codes are not.
41 * The intent of this routine is to supply the logic for the HP specific
42 * check conditions.
43 *
44 * Returns:
45 * 1 - command completed with retryable error
46 * 0 - command completed with non-retryable error
47 *
48 * Possible optimizations
49 * 1. More hardware-specific error codes
50 */
51static int hp_sw_error_is_retryable(struct request *req)
52{
53 /*
54 * NOT_READY is known to be retryable
55 * For now we just dump out the sense data and call it retryable
56 */
57 if (status_byte(req->errors) == CHECK_CONDITION)
58 __scsi_print_sense(DM_HP_HWH_NAME, req->sense, req->sense_len);
59
60 /*
61 * At this point we don't have complete information about all the error
62 * codes from this hardware, so we are just conservative and retry
63 * when in doubt.
64 */
65 return 1;
66}
67
68/*
69 * hp_sw_end_io - Completion handler for HP path activation.
70 * @req: path activation request
71 * @error: scsi-ml error
72 *
73 * Check sense data, free request structure, and notify dm that
74 * pg initialization has completed.
75 *
76 * Context: scsi-ml softirq
77 *
78 */
79static void hp_sw_end_io(struct request *req, int error)
80{
81 struct dm_path *path = req->end_io_data;
82 unsigned err_flags = 0;
83
84 if (!error) {
85 DMDEBUG("%s path activation command - success",
86 path->dev->name);
87 goto out;
88 }
89
90 if (hp_sw_error_is_retryable(req)) {
91 DMDEBUG("%s path activation command - retry",
92 path->dev->name);
93 err_flags = MP_RETRY;
94 goto out;
95 }
96
97 DMWARN("%s path activation fail - error=0x%x",
98 path->dev->name, error);
99 err_flags = MP_FAIL_PATH;
100
101out:
102 req->end_io_data = NULL;
103 __blk_put_request(req->q, req);
104 dm_pg_init_complete(path, err_flags);
105}
106
107/*
108 * hp_sw_get_request - Allocate an HP specific path activation request
109 * @path: path on which request will be sent (needed for request queue)
110 *
111 * The START command is used for path activation request.
112 * These arrays are controller-based failover, not LUN based.
113 * One START command issued to a single path will fail over all
114 * LUNs for the same controller.
115 *
116 * Possible optimizations
117 * 1. Make timeout configurable
118 * 2. Preallocate request
119 */
120static struct request *hp_sw_get_request(struct dm_path *path)
121{
122 struct request *req;
123 struct block_device *bdev = path->dev->bdev;
124 struct request_queue *q = bdev_get_queue(bdev);
125 struct hp_sw_context *h = path->hwhcontext;
126
127 req = blk_get_request(q, WRITE, GFP_NOIO);
128 if (!req)
129 goto out;
130
131 req->timeout = 60 * HZ;
132
133 req->errors = 0;
134 req->cmd_type = REQ_TYPE_BLOCK_PC;
135 req->cmd_flags |= REQ_FAILFAST | REQ_NOMERGE;
136 req->end_io_data = path;
137 req->sense = h->sense;
138 memset(req->sense, 0, SCSI_SENSE_BUFFERSIZE);
139
140 req->cmd[0] = START_STOP;
141 req->cmd[4] = 1;
142 req->cmd_len = COMMAND_SIZE(req->cmd[0]);
143
144out:
145 return req;
146}
147
148/*
149 * hp_sw_pg_init - HP path activation implementation.
150 * @hwh: hardware handler specific data
151 * @bypassed: unused; is the path group bypassed? (see dm-mpath.c)
152 * @path: path to send initialization command
153 *
154 * Send an HP-specific path activation command on 'path'.
155 * Do not try to optimize in any way, just send the activation command.
156 * More than one path activation command may be sent to the same controller.
157 * This seems to work fine for basic failover support.
158 *
159 * Possible optimizations
160 * 1. Detect an in-progress activation request and avoid submitting another one
161 * 2. Model the controller and only send a single activation request at a time
162 * 3. Determine the state of a path before sending an activation request
163 *
164 * Context: kmpathd (see process_queued_ios() in dm-mpath.c)
165 */
166static void hp_sw_pg_init(struct hw_handler *hwh, unsigned bypassed,
167 struct dm_path *path)
168{
169 struct request *req;
170 struct hp_sw_context *h;
171
172 path->hwhcontext = hwh->context;
173 h = hwh->context;
174
175 req = hp_sw_get_request(path);
176 if (!req) {
177 DMERR("%s path activation command - allocation fail",
178 path->dev->name);
179 goto retry;
180 }
181
182 DMDEBUG("%s path activation command - sent", path->dev->name);
183
184 blk_execute_rq_nowait(req->q, NULL, req, 1, hp_sw_end_io);
185 return;
186
187retry:
188 dm_pg_init_complete(path, MP_RETRY);
189}
190
191static int hp_sw_create(struct hw_handler *hwh, unsigned argc, char **argv)
192{
193 struct hp_sw_context *h;
194
195 h = kmalloc(sizeof(*h), GFP_KERNEL);
196 if (!h)
197 return -ENOMEM;
198
199 hwh->context = h;
200
201 return 0;
202}
203
204static void hp_sw_destroy(struct hw_handler *hwh)
205{
206 struct hp_sw_context *h = hwh->context;
207
208 kfree(h);
209}
210
211static struct hw_handler_type hp_sw_hwh = {
212 .name = DM_HP_HWH_NAME,
213 .module = THIS_MODULE,
214 .create = hp_sw_create,
215 .destroy = hp_sw_destroy,
216 .pg_init = hp_sw_pg_init,
217};
218
219static int __init hp_sw_init(void)
220{
221 int r;
222
223 r = dm_register_hw_handler(&hp_sw_hwh);
224 if (r < 0)
225 DMERR("register failed %d", r);
226 else
227 DMINFO("version " DM_HP_HWH_VER " loaded");
228
229 return r;
230}
231
232static void __exit hp_sw_exit(void)
233{
234 int r;
235
236 r = dm_unregister_hw_handler(&hp_sw_hwh);
237 if (r < 0)
238 DMERR("unregister failed %d", r);
239}
240
241module_init(hp_sw_init);
242module_exit(hp_sw_exit);
243
244MODULE_DESCRIPTION("DM Multipath HP StorageWorks / FSC FibreCat (A/P) support");
245MODULE_AUTHOR("Mike Christie, Dave Wysochanski <dm-devel@redhat.com>");
246MODULE_LICENSE("GPL");
247MODULE_VERSION(DM_HP_HWH_VER);
diff --git a/drivers/md/dm-mpath-rdac.c b/drivers/md/dm-mpath-rdac.c
deleted file mode 100644
index 95e77734880a..000000000000
--- a/drivers/md/dm-mpath-rdac.c
+++ /dev/null
@@ -1,700 +0,0 @@
1/*
2 * Engenio/LSI RDAC DM HW handler
3 *
4 * Copyright (C) 2005 Mike Christie. All rights reserved.
5 * Copyright (C) Chandra Seetharaman, IBM Corp. 2007
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 *
21 */
22#include <scsi/scsi.h>
23#include <scsi/scsi_cmnd.h>
24#include <scsi/scsi_eh.h>
25
26#define DM_MSG_PREFIX "multipath rdac"
27
28#include "dm.h"
29#include "dm-hw-handler.h"
30
31#define RDAC_DM_HWH_NAME "rdac"
32#define RDAC_DM_HWH_VER "0.4"
33
34/*
35 * LSI mode page stuff
36 *
37 * These struct definitions and the forming of the
38 * mode page were taken from the LSI RDAC 2.4 GPL'd
39 * driver, and then converted to Linux conventions.
40 */
41#define RDAC_QUIESCENCE_TIME 20;
42/*
43 * Page Codes
44 */
45#define RDAC_PAGE_CODE_REDUNDANT_CONTROLLER 0x2c
46
47/*
48 * Controller modes definitions
49 */
50#define RDAC_MODE_TRANSFER_ALL_LUNS 0x01
51#define RDAC_MODE_TRANSFER_SPECIFIED_LUNS 0x02
52
53/*
54 * RDAC Options field
55 */
56#define RDAC_FORCED_QUIESENCE 0x02
57
58#define RDAC_FAILOVER_TIMEOUT (60 * HZ)
59
60struct rdac_mode_6_hdr {
61 u8 data_len;
62 u8 medium_type;
63 u8 device_params;
64 u8 block_desc_len;
65};
66
67struct rdac_mode_10_hdr {
68 u16 data_len;
69 u8 medium_type;
70 u8 device_params;
71 u16 reserved;
72 u16 block_desc_len;
73};
74
75struct rdac_mode_common {
76 u8 controller_serial[16];
77 u8 alt_controller_serial[16];
78 u8 rdac_mode[2];
79 u8 alt_rdac_mode[2];
80 u8 quiescence_timeout;
81 u8 rdac_options;
82};
83
84struct rdac_pg_legacy {
85 struct rdac_mode_6_hdr hdr;
86 u8 page_code;
87 u8 page_len;
88 struct rdac_mode_common common;
89#define MODE6_MAX_LUN 32
90 u8 lun_table[MODE6_MAX_LUN];
91 u8 reserved2[32];
92 u8 reserved3;
93 u8 reserved4;
94};
95
96struct rdac_pg_expanded {
97 struct rdac_mode_10_hdr hdr;
98 u8 page_code;
99 u8 subpage_code;
100 u8 page_len[2];
101 struct rdac_mode_common common;
102 u8 lun_table[256];
103 u8 reserved3;
104 u8 reserved4;
105};
106
107struct c9_inquiry {
108 u8 peripheral_info;
109 u8 page_code; /* 0xC9 */
110 u8 reserved1;
111 u8 page_len;
112 u8 page_id[4]; /* "vace" */
113 u8 avte_cvp;
114 u8 path_prio;
115 u8 reserved2[38];
116};
117
118#define SUBSYS_ID_LEN 16
119#define SLOT_ID_LEN 2
120
121struct c4_inquiry {
122 u8 peripheral_info;
123 u8 page_code; /* 0xC4 */
124 u8 reserved1;
125 u8 page_len;
126 u8 page_id[4]; /* "subs" */
127 u8 subsys_id[SUBSYS_ID_LEN];
128 u8 revision[4];
129 u8 slot_id[SLOT_ID_LEN];
130 u8 reserved[2];
131};
132
133struct rdac_controller {
134 u8 subsys_id[SUBSYS_ID_LEN];
135 u8 slot_id[SLOT_ID_LEN];
136 int use_10_ms;
137 struct kref kref;
138 struct list_head node; /* list of all controllers */
139 spinlock_t lock;
140 int submitted;
141 struct list_head cmd_list; /* list of commands to be submitted */
142 union {
143 struct rdac_pg_legacy legacy;
144 struct rdac_pg_expanded expanded;
145 } mode_select;
146};
147struct c8_inquiry {
148 u8 peripheral_info;
149 u8 page_code; /* 0xC8 */
150 u8 reserved1;
151 u8 page_len;
152 u8 page_id[4]; /* "edid" */
153 u8 reserved2[3];
154 u8 vol_uniq_id_len;
155 u8 vol_uniq_id[16];
156 u8 vol_user_label_len;
157 u8 vol_user_label[60];
158 u8 array_uniq_id_len;
159 u8 array_unique_id[16];
160 u8 array_user_label_len;
161 u8 array_user_label[60];
162 u8 lun[8];
163};
164
165struct c2_inquiry {
166 u8 peripheral_info;
167 u8 page_code; /* 0xC2 */
168 u8 reserved1;
169 u8 page_len;
170 u8 page_id[4]; /* "swr4" */
171 u8 sw_version[3];
172 u8 sw_date[3];
173 u8 features_enabled;
174 u8 max_lun_supported;
175 u8 partitions[239]; /* Total allocation length should be 0xFF */
176};
177
178struct rdac_handler {
179 struct list_head entry; /* list waiting to submit MODE SELECT */
180 unsigned timeout;
181 struct rdac_controller *ctlr;
182#define UNINITIALIZED_LUN (1 << 8)
183 unsigned lun;
184 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
185 struct dm_path *path;
186 struct work_struct work;
187#define SEND_C2_INQUIRY 1
188#define SEND_C4_INQUIRY 2
189#define SEND_C8_INQUIRY 3
190#define SEND_C9_INQUIRY 4
191#define SEND_MODE_SELECT 5
192 int cmd_to_send;
193 union {
194 struct c2_inquiry c2;
195 struct c4_inquiry c4;
196 struct c8_inquiry c8;
197 struct c9_inquiry c9;
198 } inq;
199};
200
201static LIST_HEAD(ctlr_list);
202static DEFINE_SPINLOCK(list_lock);
203static struct workqueue_struct *rdac_wkqd;
204
205static inline int had_failures(struct request *req, int error)
206{
207 return (error || host_byte(req->errors) != DID_OK ||
208 msg_byte(req->errors) != COMMAND_COMPLETE);
209}
210
211static void rdac_resubmit_all(struct rdac_handler *h)
212{
213 struct rdac_controller *ctlr = h->ctlr;
214 struct rdac_handler *tmp, *h1;
215
216 spin_lock(&ctlr->lock);
217 list_for_each_entry_safe(h1, tmp, &ctlr->cmd_list, entry) {
218 h1->cmd_to_send = SEND_C9_INQUIRY;
219 queue_work(rdac_wkqd, &h1->work);
220 list_del(&h1->entry);
221 }
222 ctlr->submitted = 0;
223 spin_unlock(&ctlr->lock);
224}
225
226static void mode_select_endio(struct request *req, int error)
227{
228 struct rdac_handler *h = req->end_io_data;
229 struct scsi_sense_hdr sense_hdr;
230 int sense = 0, fail = 0;
231
232 if (had_failures(req, error)) {
233 fail = 1;
234 goto failed;
235 }
236
237 if (status_byte(req->errors) == CHECK_CONDITION) {
238 scsi_normalize_sense(req->sense, SCSI_SENSE_BUFFERSIZE,
239 &sense_hdr);
240 sense = (sense_hdr.sense_key << 16) | (sense_hdr.asc << 8) |
241 sense_hdr.ascq;
242 /* If it is retryable failure, submit the c9 inquiry again */
243 if (sense == 0x59136 || sense == 0x68b02 || sense == 0xb8b02 ||
244 sense == 0x62900) {
245 /* 0x59136 - Command lock contention
246 * 0x[6b]8b02 - Quiesense in progress or achieved
247 * 0x62900 - Power On, Reset, or Bus Device Reset
248 */
249 h->cmd_to_send = SEND_C9_INQUIRY;
250 queue_work(rdac_wkqd, &h->work);
251 goto done;
252 }
253 if (sense)
254 DMINFO("MODE_SELECT failed on %s with sense 0x%x",
255 h->path->dev->name, sense);
256 }
257failed:
258 if (fail || sense)
259 dm_pg_init_complete(h->path, MP_FAIL_PATH);
260 else
261 dm_pg_init_complete(h->path, 0);
262
263done:
264 rdac_resubmit_all(h);
265 __blk_put_request(req->q, req);
266}
267
268static struct request *get_rdac_req(struct rdac_handler *h,
269 void *buffer, unsigned buflen, int rw)
270{
271 struct request *rq;
272 struct request_queue *q = bdev_get_queue(h->path->dev->bdev);
273
274 rq = blk_get_request(q, rw, GFP_KERNEL);
275
276 if (!rq) {
277 DMINFO("get_rdac_req: blk_get_request failed");
278 return NULL;
279 }
280
281 if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_KERNEL)) {
282 blk_put_request(rq);
283 DMINFO("get_rdac_req: blk_rq_map_kern failed");
284 return NULL;
285 }
286
287 rq->sense = h->sense;
288 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
289 rq->sense_len = 0;
290
291 rq->end_io_data = h;
292 rq->timeout = h->timeout;
293 rq->cmd_type = REQ_TYPE_BLOCK_PC;
294 rq->cmd_flags |= REQ_FAILFAST | REQ_NOMERGE;
295 return rq;
296}
297
298static struct request *rdac_failover_get(struct rdac_handler *h)
299{
300 struct request *rq;
301 struct rdac_mode_common *common;
302 unsigned data_size;
303
304 if (h->ctlr->use_10_ms) {
305 struct rdac_pg_expanded *rdac_pg;
306
307 data_size = sizeof(struct rdac_pg_expanded);
308 rdac_pg = &h->ctlr->mode_select.expanded;
309 memset(rdac_pg, 0, data_size);
310 common = &rdac_pg->common;
311 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40;
312 rdac_pg->subpage_code = 0x1;
313 rdac_pg->page_len[0] = 0x01;
314 rdac_pg->page_len[1] = 0x28;
315 rdac_pg->lun_table[h->lun] = 0x81;
316 } else {
317 struct rdac_pg_legacy *rdac_pg;
318
319 data_size = sizeof(struct rdac_pg_legacy);
320 rdac_pg = &h->ctlr->mode_select.legacy;
321 memset(rdac_pg, 0, data_size);
322 common = &rdac_pg->common;
323 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER;
324 rdac_pg->page_len = 0x68;
325 rdac_pg->lun_table[h->lun] = 0x81;
326 }
327 common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS;
328 common->quiescence_timeout = RDAC_QUIESCENCE_TIME;
329 common->rdac_options = RDAC_FORCED_QUIESENCE;
330
331 /* get request for block layer packet command */
332 rq = get_rdac_req(h, &h->ctlr->mode_select, data_size, WRITE);
333 if (!rq) {
334 DMERR("rdac_failover_get: no rq");
335 return NULL;
336 }
337
338 /* Prepare the command. */
339 if (h->ctlr->use_10_ms) {
340 rq->cmd[0] = MODE_SELECT_10;
341 rq->cmd[7] = data_size >> 8;
342 rq->cmd[8] = data_size & 0xff;
343 } else {
344 rq->cmd[0] = MODE_SELECT;
345 rq->cmd[4] = data_size;
346 }
347 rq->cmd_len = COMMAND_SIZE(rq->cmd[0]);
348
349 return rq;
350}
351
352/* Acquires h->ctlr->lock */
353static void submit_mode_select(struct rdac_handler *h)
354{
355 struct request *rq;
356 struct request_queue *q = bdev_get_queue(h->path->dev->bdev);
357
358 spin_lock(&h->ctlr->lock);
359 if (h->ctlr->submitted) {
360 list_add(&h->entry, &h->ctlr->cmd_list);
361 goto drop_lock;
362 }
363
364 if (!q) {
365 DMINFO("submit_mode_select: no queue");
366 goto fail_path;
367 }
368
369 rq = rdac_failover_get(h);
370 if (!rq) {
371 DMERR("submit_mode_select: no rq");
372 goto fail_path;
373 }
374
375 DMINFO("queueing MODE_SELECT command on %s", h->path->dev->name);
376
377 blk_execute_rq_nowait(q, NULL, rq, 1, mode_select_endio);
378 h->ctlr->submitted = 1;
379 goto drop_lock;
380fail_path:
381 dm_pg_init_complete(h->path, MP_FAIL_PATH);
382drop_lock:
383 spin_unlock(&h->ctlr->lock);
384}
385
386static void release_ctlr(struct kref *kref)
387{
388 struct rdac_controller *ctlr;
389 ctlr = container_of(kref, struct rdac_controller, kref);
390
391 spin_lock(&list_lock);
392 list_del(&ctlr->node);
393 spin_unlock(&list_lock);
394 kfree(ctlr);
395}
396
397static struct rdac_controller *get_controller(u8 *subsys_id, u8 *slot_id)
398{
399 struct rdac_controller *ctlr, *tmp;
400
401 spin_lock(&list_lock);
402
403 list_for_each_entry(tmp, &ctlr_list, node) {
404 if ((memcmp(tmp->subsys_id, subsys_id, SUBSYS_ID_LEN) == 0) &&
405 (memcmp(tmp->slot_id, slot_id, SLOT_ID_LEN) == 0)) {
406 kref_get(&tmp->kref);
407 spin_unlock(&list_lock);
408 return tmp;
409 }
410 }
411 ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC);
412 if (!ctlr)
413 goto done;
414
415 /* initialize fields of controller */
416 memcpy(ctlr->subsys_id, subsys_id, SUBSYS_ID_LEN);
417 memcpy(ctlr->slot_id, slot_id, SLOT_ID_LEN);
418 kref_init(&ctlr->kref);
419 spin_lock_init(&ctlr->lock);
420 ctlr->submitted = 0;
421 ctlr->use_10_ms = -1;
422 INIT_LIST_HEAD(&ctlr->cmd_list);
423 list_add(&ctlr->node, &ctlr_list);
424done:
425 spin_unlock(&list_lock);
426 return ctlr;
427}
428
429static void c4_endio(struct request *req, int error)
430{
431 struct rdac_handler *h = req->end_io_data;
432 struct c4_inquiry *sp;
433
434 if (had_failures(req, error)) {
435 dm_pg_init_complete(h->path, MP_FAIL_PATH);
436 goto done;
437 }
438
439 sp = &h->inq.c4;
440
441 h->ctlr = get_controller(sp->subsys_id, sp->slot_id);
442
443 if (h->ctlr) {
444 h->cmd_to_send = SEND_C9_INQUIRY;
445 queue_work(rdac_wkqd, &h->work);
446 } else
447 dm_pg_init_complete(h->path, MP_FAIL_PATH);
448done:
449 __blk_put_request(req->q, req);
450}
451
452static void c2_endio(struct request *req, int error)
453{
454 struct rdac_handler *h = req->end_io_data;
455 struct c2_inquiry *sp;
456
457 if (had_failures(req, error)) {
458 dm_pg_init_complete(h->path, MP_FAIL_PATH);
459 goto done;
460 }
461
462 sp = &h->inq.c2;
463
464 /* If more than MODE6_MAX_LUN luns are supported, use mode select 10 */
465 if (sp->max_lun_supported >= MODE6_MAX_LUN)
466 h->ctlr->use_10_ms = 1;
467 else
468 h->ctlr->use_10_ms = 0;
469
470 h->cmd_to_send = SEND_MODE_SELECT;
471 queue_work(rdac_wkqd, &h->work);
472done:
473 __blk_put_request(req->q, req);
474}
475
476static void c9_endio(struct request *req, int error)
477{
478 struct rdac_handler *h = req->end_io_data;
479 struct c9_inquiry *sp;
480
481 if (had_failures(req, error)) {
482 dm_pg_init_complete(h->path, MP_FAIL_PATH);
483 goto done;
484 }
485
486 /* We need to look at the sense keys here to take clear action.
487 * For now simple logic: If the host is in AVT mode or if controller
488 * owns the lun, return dm_pg_init_complete(), otherwise submit
489 * MODE SELECT.
490 */
491 sp = &h->inq.c9;
492
493 /* If in AVT mode, return success */
494 if ((sp->avte_cvp >> 7) == 0x1) {
495 dm_pg_init_complete(h->path, 0);
496 goto done;
497 }
498
499 /* If the controller on this path owns the LUN, return success */
500 if (sp->avte_cvp & 0x1) {
501 dm_pg_init_complete(h->path, 0);
502 goto done;
503 }
504
505 if (h->ctlr) {
506 if (h->ctlr->use_10_ms == -1)
507 h->cmd_to_send = SEND_C2_INQUIRY;
508 else
509 h->cmd_to_send = SEND_MODE_SELECT;
510 } else
511 h->cmd_to_send = SEND_C4_INQUIRY;
512 queue_work(rdac_wkqd, &h->work);
513done:
514 __blk_put_request(req->q, req);
515}
516
517static void c8_endio(struct request *req, int error)
518{
519 struct rdac_handler *h = req->end_io_data;
520 struct c8_inquiry *sp;
521
522 if (had_failures(req, error)) {
523 dm_pg_init_complete(h->path, MP_FAIL_PATH);
524 goto done;
525 }
526
527 /* We need to look at the sense keys here to take clear action.
528 * For now simple logic: Get the lun from the inquiry page.
529 */
530 sp = &h->inq.c8;
531 h->lun = sp->lun[7]; /* currently it uses only one byte */
532 h->cmd_to_send = SEND_C9_INQUIRY;
533 queue_work(rdac_wkqd, &h->work);
534done:
535 __blk_put_request(req->q, req);
536}
537
538static void submit_inquiry(struct rdac_handler *h, int page_code,
539 unsigned int len, rq_end_io_fn endio)
540{
541 struct request *rq;
542 struct request_queue *q = bdev_get_queue(h->path->dev->bdev);
543
544 if (!q)
545 goto fail_path;
546
547 rq = get_rdac_req(h, &h->inq, len, READ);
548 if (!rq)
549 goto fail_path;
550
551 /* Prepare the command. */
552 rq->cmd[0] = INQUIRY;
553 rq->cmd[1] = 1;
554 rq->cmd[2] = page_code;
555 rq->cmd[4] = len;
556 rq->cmd_len = COMMAND_SIZE(INQUIRY);
557 blk_execute_rq_nowait(q, NULL, rq, 1, endio);
558 return;
559
560fail_path:
561 dm_pg_init_complete(h->path, MP_FAIL_PATH);
562}
563
564static void service_wkq(struct work_struct *work)
565{
566 struct rdac_handler *h = container_of(work, struct rdac_handler, work);
567
568 switch (h->cmd_to_send) {
569 case SEND_C2_INQUIRY:
570 submit_inquiry(h, 0xC2, sizeof(struct c2_inquiry), c2_endio);
571 break;
572 case SEND_C4_INQUIRY:
573 submit_inquiry(h, 0xC4, sizeof(struct c4_inquiry), c4_endio);
574 break;
575 case SEND_C8_INQUIRY:
576 submit_inquiry(h, 0xC8, sizeof(struct c8_inquiry), c8_endio);
577 break;
578 case SEND_C9_INQUIRY:
579 submit_inquiry(h, 0xC9, sizeof(struct c9_inquiry), c9_endio);
580 break;
581 case SEND_MODE_SELECT:
582 submit_mode_select(h);
583 break;
584 default:
585 BUG();
586 }
587}
588/*
589 * only support subpage2c until we confirm that this is just a matter of
590 * of updating firmware or not, and RDAC (basic AVT works already) for now
591 * but we can add these in in when we get time and testers
592 */
593static int rdac_create(struct hw_handler *hwh, unsigned argc, char **argv)
594{
595 struct rdac_handler *h;
596 unsigned timeout;
597
598 if (argc == 0) {
599 /* No arguments: use defaults */
600 timeout = RDAC_FAILOVER_TIMEOUT;
601 } else if (argc != 1) {
602 DMWARN("incorrect number of arguments");
603 return -EINVAL;
604 } else {
605 if (sscanf(argv[1], "%u", &timeout) != 1) {
606 DMWARN("invalid timeout value");
607 return -EINVAL;
608 }
609 }
610
611 h = kzalloc(sizeof(*h), GFP_KERNEL);
612 if (!h)
613 return -ENOMEM;
614
615 hwh->context = h;
616 h->timeout = timeout;
617 h->lun = UNINITIALIZED_LUN;
618 INIT_WORK(&h->work, service_wkq);
619 DMWARN("using RDAC command with timeout %u", h->timeout);
620
621 return 0;
622}
623
624static void rdac_destroy(struct hw_handler *hwh)
625{
626 struct rdac_handler *h = hwh->context;
627
628 if (h->ctlr)
629 kref_put(&h->ctlr->kref, release_ctlr);
630 kfree(h);
631 hwh->context = NULL;
632}
633
634static unsigned rdac_error(struct hw_handler *hwh, struct bio *bio)
635{
636 /* Try default handler */
637 return dm_scsi_err_handler(hwh, bio);
638}
639
640static void rdac_pg_init(struct hw_handler *hwh, unsigned bypassed,
641 struct dm_path *path)
642{
643 struct rdac_handler *h = hwh->context;
644
645 h->path = path;
646 switch (h->lun) {
647 case UNINITIALIZED_LUN:
648 submit_inquiry(h, 0xC8, sizeof(struct c8_inquiry), c8_endio);
649 break;
650 default:
651 submit_inquiry(h, 0xC9, sizeof(struct c9_inquiry), c9_endio);
652 }
653}
654
655static struct hw_handler_type rdac_handler = {
656 .name = RDAC_DM_HWH_NAME,
657 .module = THIS_MODULE,
658 .create = rdac_create,
659 .destroy = rdac_destroy,
660 .pg_init = rdac_pg_init,
661 .error = rdac_error,
662};
663
664static int __init rdac_init(void)
665{
666 int r;
667
668 rdac_wkqd = create_singlethread_workqueue("rdac_wkqd");
669 if (!rdac_wkqd) {
670 DMERR("Failed to create workqueue rdac_wkqd.");
671 return -ENOMEM;
672 }
673
674 r = dm_register_hw_handler(&rdac_handler);
675 if (r < 0) {
676 DMERR("%s: register failed %d", RDAC_DM_HWH_NAME, r);
677 destroy_workqueue(rdac_wkqd);
678 return r;
679 }
680
681 DMINFO("%s: version %s loaded", RDAC_DM_HWH_NAME, RDAC_DM_HWH_VER);
682 return 0;
683}
684
685static void __exit rdac_exit(void)
686{
687 int r = dm_unregister_hw_handler(&rdac_handler);
688
689 destroy_workqueue(rdac_wkqd);
690 if (r < 0)
691 DMERR("%s: unregister failed %d", RDAC_DM_HWH_NAME, r);
692}
693
694module_init(rdac_init);
695module_exit(rdac_exit);
696
697MODULE_DESCRIPTION("DM Multipath LSI/Engenio RDAC support");
698MODULE_AUTHOR("Mike Christie, Chandra Seetharaman");
699MODULE_LICENSE("GPL");
700MODULE_VERSION(RDAC_DM_HWH_VER);
generated by cgit v1.2.2 (git 2.25.0) at 2024-09-21 04:28:34 -0400