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1da177e4 LT |
1 | /* ------------------------------------------------------------ |
2 | * ibmvscsi.c | |
3 | * (C) Copyright IBM Corporation 1994, 2004 | |
4 | * Authors: Colin DeVilbiss (devilbis@us.ibm.com) | |
5 | * Santiago Leon (santil@us.ibm.com) | |
6 | * Dave Boutcher (sleddog@us.ibm.com) | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
21 | * USA | |
22 | * | |
23 | * ------------------------------------------------------------ | |
24 | * Emulation of a SCSI host adapter for Virtual I/O devices | |
25 | * | |
26 | * This driver supports the SCSI adapter implemented by the IBM | |
27 | * Power5 firmware. That SCSI adapter is not a physical adapter, | |
28 | * but allows Linux SCSI peripheral drivers to directly | |
29 | * access devices in another logical partition on the physical system. | |
30 | * | |
31 | * The virtual adapter(s) are present in the open firmware device | |
32 | * tree just like real adapters. | |
33 | * | |
34 | * One of the capabilities provided on these systems is the ability | |
35 | * to DMA between partitions. The architecture states that for VSCSI, | |
36 | * the server side is allowed to DMA to and from the client. The client | |
37 | * is never trusted to DMA to or from the server directly. | |
38 | * | |
39 | * Messages are sent between partitions on a "Command/Response Queue" | |
40 | * (CRQ), which is just a buffer of 16 byte entries in the receiver's | |
41 | * Senders cannot access the buffer directly, but send messages by | |
42 | * making a hypervisor call and passing in the 16 bytes. The hypervisor | |
9b7dac08 | 43 | * puts the message in the next 16 byte space in round-robin fashion, |
1da177e4 LT |
44 | * turns on the high order bit of the message (the valid bit), and |
45 | * generates an interrupt to the receiver (if interrupts are turned on.) | |
46 | * The receiver just turns off the valid bit when they have copied out | |
47 | * the message. | |
48 | * | |
49 | * The VSCSI client builds a SCSI Remote Protocol (SRP) Information Unit | |
50 | * (IU) (as defined in the T10 standard available at www.t10.org), gets | |
51 | * a DMA address for the message, and sends it to the server as the | |
52 | * payload of a CRQ message. The server DMAs the SRP IU and processes it, | |
53 | * including doing any additional data transfers. When it is done, it | |
54 | * DMAs the SRP response back to the same address as the request came from, | |
55 | * and sends a CRQ message back to inform the client that the request has | |
56 | * completed. | |
57 | * | |
58 | * Note that some of the underlying infrastructure is different between | |
59 | * machines conforming to the "RS/6000 Platform Architecture" (RPA) and | |
60 | * the older iSeries hypervisor models. To support both, some low level | |
61 | * routines have been broken out into rpa_vscsi.c and iseries_vscsi.c. | |
62 | * The Makefile should pick one, not two, not zero, of these. | |
63 | * | |
64 | * TODO: This is currently pretty tied to the IBM i/pSeries hypervisor | |
65 | * interfaces. It would be really nice to abstract this above an RDMA | |
66 | * layer. | |
67 | */ | |
68 | ||
69 | #include <linux/module.h> | |
70 | #include <linux/moduleparam.h> | |
71 | #include <linux/dma-mapping.h> | |
72 | #include <linux/delay.h> | |
126c5cc3 | 73 | #include <linux/of.h> |
64355b92 | 74 | #include <linux/pm.h> |
d3849d51 | 75 | #include <asm/firmware.h> |
1da177e4 LT |
76 | #include <asm/vio.h> |
77 | #include <scsi/scsi.h> | |
78 | #include <scsi/scsi_cmnd.h> | |
79 | #include <scsi/scsi_host.h> | |
80 | #include <scsi/scsi_device.h> | |
4d680419 | 81 | #include <scsi/scsi_transport_srp.h> |
1da177e4 LT |
82 | #include "ibmvscsi.h" |
83 | ||
84 | /* The values below are somewhat arbitrary default values, but | |
85 | * OS/400 will use 3 busses (disks, CDs, tapes, I think.) | |
86 | * Note that there are 3 bits of channel value, 6 bits of id, and | |
87 | * 5 bits of LUN. | |
88 | */ | |
89 | static int max_id = 64; | |
90 | static int max_channel = 3; | |
e1a5ce5b RJ |
91 | static int init_timeout = 300; |
92 | static int login_timeout = 60; | |
93 | static int info_timeout = 30; | |
94 | static int abort_timeout = 60; | |
95 | static int reset_timeout = 60; | |
a897ff2a | 96 | static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT; |
4f10aae0 | 97 | static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2; |
c1988e31 | 98 | static int fast_fail = 1; |
126c5cc3 | 99 | static int client_reserve = 1; |
1da177e4 | 100 | |
4d680419 FT |
101 | static struct scsi_transport_template *ibmvscsi_transport_template; |
102 | ||
2b541f8f | 103 | #define IBMVSCSI_VERSION "1.5.8" |
1da177e4 | 104 | |
d3849d51 DW |
105 | static struct ibmvscsi_ops *ibmvscsi_ops; |
106 | ||
1da177e4 LT |
107 | MODULE_DESCRIPTION("IBM Virtual SCSI"); |
108 | MODULE_AUTHOR("Dave Boutcher"); | |
109 | MODULE_LICENSE("GPL"); | |
110 | MODULE_VERSION(IBMVSCSI_VERSION); | |
111 | ||
112 | module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR); | |
113 | MODULE_PARM_DESC(max_id, "Largest ID value for each channel"); | |
114 | module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR); | |
115 | MODULE_PARM_DESC(max_channel, "Largest channel value"); | |
116 | module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR); | |
117 | MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds"); | |
21465eda | 118 | module_param_named(max_requests, max_requests, int, S_IRUGO); |
1da177e4 | 119 | MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter"); |
c1988e31 RJ |
120 | module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR); |
121 | MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]"); | |
126c5cc3 BK |
122 | module_param_named(client_reserve, client_reserve, int, S_IRUGO ); |
123 | MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release"); | |
1da177e4 LT |
124 | |
125 | /* ------------------------------------------------------------ | |
126 | * Routines for the event pool and event structs | |
127 | */ | |
128 | /** | |
129 | * initialize_event_pool: - Allocates and initializes the event pool for a host | |
130 | * @pool: event_pool to be initialized | |
131 | * @size: Number of events in pool | |
132 | * @hostdata: ibmvscsi_host_data who owns the event pool | |
133 | * | |
134 | * Returns zero on success. | |
135 | */ | |
136 | static int initialize_event_pool(struct event_pool *pool, | |
137 | int size, struct ibmvscsi_host_data *hostdata) | |
138 | { | |
139 | int i; | |
140 | ||
141 | pool->size = size; | |
142 | pool->next = 0; | |
4c021dd1 | 143 | pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL); |
1da177e4 LT |
144 | if (!pool->events) |
145 | return -ENOMEM; | |
1da177e4 LT |
146 | |
147 | pool->iu_storage = | |
148 | dma_alloc_coherent(hostdata->dev, | |
149 | pool->size * sizeof(*pool->iu_storage), | |
150 | &pool->iu_token, 0); | |
151 | if (!pool->iu_storage) { | |
152 | kfree(pool->events); | |
153 | return -ENOMEM; | |
154 | } | |
155 | ||
156 | for (i = 0; i < pool->size; ++i) { | |
157 | struct srp_event_struct *evt = &pool->events[i]; | |
158 | memset(&evt->crq, 0x00, sizeof(evt->crq)); | |
159 | atomic_set(&evt->free, 1); | |
160 | evt->crq.valid = 0x80; | |
161 | evt->crq.IU_length = sizeof(*evt->xfer_iu); | |
162 | evt->crq.IU_data_ptr = pool->iu_token + | |
163 | sizeof(*evt->xfer_iu) * i; | |
164 | evt->xfer_iu = pool->iu_storage + i; | |
165 | evt->hostdata = hostdata; | |
4dddbc26 JB |
166 | evt->ext_list = NULL; |
167 | evt->ext_list_token = 0; | |
1da177e4 LT |
168 | } |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
173 | /** | |
174 | * release_event_pool: - Frees memory of an event pool of a host | |
175 | * @pool: event_pool to be released | |
176 | * @hostdata: ibmvscsi_host_data who owns the even pool | |
177 | * | |
178 | * Returns zero on success. | |
179 | */ | |
180 | static void release_event_pool(struct event_pool *pool, | |
181 | struct ibmvscsi_host_data *hostdata) | |
182 | { | |
183 | int i, in_use = 0; | |
4dddbc26 | 184 | for (i = 0; i < pool->size; ++i) { |
1da177e4 LT |
185 | if (atomic_read(&pool->events[i].free) != 1) |
186 | ++in_use; | |
4dddbc26 JB |
187 | if (pool->events[i].ext_list) { |
188 | dma_free_coherent(hostdata->dev, | |
ef265673 | 189 | SG_ALL * sizeof(struct srp_direct_buf), |
4dddbc26 JB |
190 | pool->events[i].ext_list, |
191 | pool->events[i].ext_list_token); | |
192 | } | |
193 | } | |
1da177e4 | 194 | if (in_use) |
6c0a60ec BK |
195 | dev_warn(hostdata->dev, "releasing event pool with %d " |
196 | "events still in use?\n", in_use); | |
1da177e4 LT |
197 | kfree(pool->events); |
198 | dma_free_coherent(hostdata->dev, | |
199 | pool->size * sizeof(*pool->iu_storage), | |
200 | pool->iu_storage, pool->iu_token); | |
201 | } | |
202 | ||
203 | /** | |
204 | * valid_event_struct: - Determines if event is valid. | |
205 | * @pool: event_pool that contains the event | |
206 | * @evt: srp_event_struct to be checked for validity | |
207 | * | |
208 | * Returns zero if event is invalid, one otherwise. | |
209 | */ | |
210 | static int valid_event_struct(struct event_pool *pool, | |
211 | struct srp_event_struct *evt) | |
212 | { | |
213 | int index = evt - pool->events; | |
214 | if (index < 0 || index >= pool->size) /* outside of bounds */ | |
215 | return 0; | |
216 | if (evt != pool->events + index) /* unaligned */ | |
217 | return 0; | |
218 | return 1; | |
219 | } | |
220 | ||
221 | /** | |
222 | * ibmvscsi_free-event_struct: - Changes status of event to "free" | |
223 | * @pool: event_pool that contains the event | |
224 | * @evt: srp_event_struct to be modified | |
225 | * | |
226 | */ | |
227 | static void free_event_struct(struct event_pool *pool, | |
228 | struct srp_event_struct *evt) | |
229 | { | |
230 | if (!valid_event_struct(pool, evt)) { | |
6c0a60ec BK |
231 | dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p " |
232 | "(not in pool %p)\n", evt, pool->events); | |
1da177e4 LT |
233 | return; |
234 | } | |
235 | if (atomic_inc_return(&evt->free) != 1) { | |
6c0a60ec BK |
236 | dev_err(evt->hostdata->dev, "Freeing event_struct %p " |
237 | "which is not in use!\n", evt); | |
1da177e4 LT |
238 | return; |
239 | } | |
240 | } | |
241 | ||
242 | /** | |
243 | * get_evt_struct: - Gets the next free event in pool | |
244 | * @pool: event_pool that contains the events to be searched | |
245 | * | |
246 | * Returns the next event in "free" state, and NULL if none are free. | |
247 | * Note that no synchronization is done here, we assume the host_lock | |
248 | * will syncrhonze things. | |
249 | */ | |
250 | static struct srp_event_struct *get_event_struct(struct event_pool *pool) | |
251 | { | |
252 | int i; | |
253 | int poolsize = pool->size; | |
254 | int offset = pool->next; | |
255 | ||
256 | for (i = 0; i < poolsize; i++) { | |
257 | offset = (offset + 1) % poolsize; | |
258 | if (!atomic_dec_if_positive(&pool->events[offset].free)) { | |
259 | pool->next = offset; | |
260 | return &pool->events[offset]; | |
261 | } | |
262 | } | |
263 | ||
264 | printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n"); | |
265 | return NULL; | |
266 | } | |
267 | ||
268 | /** | |
269 | * init_event_struct: Initialize fields in an event struct that are always | |
270 | * required. | |
271 | * @evt: The event | |
272 | * @done: Routine to call when the event is responded to | |
273 | * @format: SRP or MAD format | |
274 | * @timeout: timeout value set in the CRQ | |
275 | */ | |
276 | static void init_event_struct(struct srp_event_struct *evt_struct, | |
277 | void (*done) (struct srp_event_struct *), | |
278 | u8 format, | |
279 | int timeout) | |
280 | { | |
281 | evt_struct->cmnd = NULL; | |
282 | evt_struct->cmnd_done = NULL; | |
283 | evt_struct->sync_srp = NULL; | |
284 | evt_struct->crq.format = format; | |
285 | evt_struct->crq.timeout = timeout; | |
286 | evt_struct->done = done; | |
287 | } | |
288 | ||
289 | /* ------------------------------------------------------------ | |
290 | * Routines for receiving SCSI responses from the hosting partition | |
291 | */ | |
292 | ||
293 | /** | |
294 | * set_srp_direction: Set the fields in the srp related to data | |
295 | * direction and number of buffers based on the direction in | |
296 | * the scsi_cmnd and the number of buffers | |
297 | */ | |
298 | static void set_srp_direction(struct scsi_cmnd *cmd, | |
299 | struct srp_cmd *srp_cmd, | |
300 | int numbuf) | |
301 | { | |
ef265673 FT |
302 | u8 fmt; |
303 | ||
1da177e4 LT |
304 | if (numbuf == 0) |
305 | return; | |
306 | ||
ef265673 FT |
307 | if (numbuf == 1) |
308 | fmt = SRP_DATA_DESC_DIRECT; | |
309 | else { | |
310 | fmt = SRP_DATA_DESC_INDIRECT; | |
311 | numbuf = min(numbuf, MAX_INDIRECT_BUFS); | |
312 | ||
1da177e4 | 313 | if (cmd->sc_data_direction == DMA_TO_DEVICE) |
ef265673 FT |
314 | srp_cmd->data_out_desc_cnt = numbuf; |
315 | else | |
316 | srp_cmd->data_in_desc_cnt = numbuf; | |
1da177e4 | 317 | } |
ef265673 FT |
318 | |
319 | if (cmd->sc_data_direction == DMA_TO_DEVICE) | |
320 | srp_cmd->buf_fmt = fmt << 4; | |
321 | else | |
322 | srp_cmd->buf_fmt = fmt; | |
1da177e4 LT |
323 | } |
324 | ||
ef265673 | 325 | static void unmap_sg_list(int num_entries, |
4dddbc26 | 326 | struct device *dev, |
ef265673 FT |
327 | struct srp_direct_buf *md) |
328 | { | |
4dddbc26 JB |
329 | int i; |
330 | ||
ef265673 FT |
331 | for (i = 0; i < num_entries; ++i) |
332 | dma_unmap_single(dev, md[i].va, md[i].len, DMA_BIDIRECTIONAL); | |
4dddbc26 JB |
333 | } |
334 | ||
1da177e4 LT |
335 | /** |
336 | * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format | |
337 | * @cmd: srp_cmd whose additional_data member will be unmapped | |
338 | * @dev: device for which the memory is mapped | |
339 | * | |
340 | */ | |
4dddbc26 JB |
341 | static void unmap_cmd_data(struct srp_cmd *cmd, |
342 | struct srp_event_struct *evt_struct, | |
343 | struct device *dev) | |
1da177e4 | 344 | { |
ef265673 FT |
345 | u8 out_fmt, in_fmt; |
346 | ||
347 | out_fmt = cmd->buf_fmt >> 4; | |
348 | in_fmt = cmd->buf_fmt & ((1U << 4) - 1); | |
349 | ||
350 | if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC) | |
1da177e4 | 351 | return; |
ef265673 FT |
352 | else if (out_fmt == SRP_DATA_DESC_DIRECT || |
353 | in_fmt == SRP_DATA_DESC_DIRECT) { | |
354 | struct srp_direct_buf *data = | |
355 | (struct srp_direct_buf *) cmd->add_data; | |
356 | dma_unmap_single(dev, data->va, data->len, DMA_BIDIRECTIONAL); | |
1da177e4 | 357 | } else { |
ef265673 FT |
358 | struct srp_indirect_buf *indirect = |
359 | (struct srp_indirect_buf *) cmd->add_data; | |
360 | int num_mapped = indirect->table_desc.len / | |
361 | sizeof(struct srp_direct_buf); | |
4dddbc26 JB |
362 | |
363 | if (num_mapped <= MAX_INDIRECT_BUFS) { | |
ef265673 | 364 | unmap_sg_list(num_mapped, dev, &indirect->desc_list[0]); |
4dddbc26 | 365 | return; |
1da177e4 | 366 | } |
4dddbc26 JB |
367 | |
368 | unmap_sg_list(num_mapped, dev, evt_struct->ext_list); | |
1da177e4 LT |
369 | } |
370 | } | |
371 | ||
9413d7b8 | 372 | static int map_sg_list(struct scsi_cmnd *cmd, int nseg, |
ef265673 | 373 | struct srp_direct_buf *md) |
4dddbc26 JB |
374 | { |
375 | int i; | |
9413d7b8 | 376 | struct scatterlist *sg; |
4dddbc26 JB |
377 | u64 total_length = 0; |
378 | ||
9413d7b8 | 379 | scsi_for_each_sg(cmd, sg, nseg, i) { |
ef265673 | 380 | struct srp_direct_buf *descr = md + i; |
9413d7b8 FT |
381 | descr->va = sg_dma_address(sg); |
382 | descr->len = sg_dma_len(sg); | |
ef265673 | 383 | descr->key = 0; |
9413d7b8 | 384 | total_length += sg_dma_len(sg); |
4dddbc26 JB |
385 | } |
386 | return total_length; | |
387 | } | |
388 | ||
1da177e4 LT |
389 | /** |
390 | * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields | |
391 | * @cmd: Scsi_Cmnd with the scatterlist | |
392 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
393 | * @dev: device for which to map dma memory | |
394 | * | |
395 | * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd. | |
396 | * Returns 1 on success. | |
397 | */ | |
398 | static int map_sg_data(struct scsi_cmnd *cmd, | |
4dddbc26 | 399 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
400 | struct srp_cmd *srp_cmd, struct device *dev) |
401 | { | |
402 | ||
4dddbc26 | 403 | int sg_mapped; |
1da177e4 | 404 | u64 total_length = 0; |
ef265673 FT |
405 | struct srp_direct_buf *data = |
406 | (struct srp_direct_buf *) srp_cmd->add_data; | |
407 | struct srp_indirect_buf *indirect = | |
408 | (struct srp_indirect_buf *) data; | |
1da177e4 | 409 | |
9413d7b8 FT |
410 | sg_mapped = scsi_dma_map(cmd); |
411 | if (!sg_mapped) | |
412 | return 1; | |
413 | else if (sg_mapped < 0) | |
1da177e4 LT |
414 | return 0; |
415 | ||
416 | set_srp_direction(cmd, srp_cmd, sg_mapped); | |
417 | ||
418 | /* special case; we can use a single direct descriptor */ | |
419 | if (sg_mapped == 1) { | |
9413d7b8 | 420 | map_sg_list(cmd, sg_mapped, data); |
1da177e4 LT |
421 | return 1; |
422 | } | |
423 | ||
ef265673 FT |
424 | indirect->table_desc.va = 0; |
425 | indirect->table_desc.len = sg_mapped * sizeof(struct srp_direct_buf); | |
426 | indirect->table_desc.key = 0; | |
4dddbc26 JB |
427 | |
428 | if (sg_mapped <= MAX_INDIRECT_BUFS) { | |
9413d7b8 | 429 | total_length = map_sg_list(cmd, sg_mapped, |
ef265673 FT |
430 | &indirect->desc_list[0]); |
431 | indirect->len = total_length; | |
4dddbc26 | 432 | return 1; |
1da177e4 | 433 | } |
1da177e4 | 434 | |
4dddbc26 JB |
435 | /* get indirect table */ |
436 | if (!evt_struct->ext_list) { | |
ef265673 | 437 | evt_struct->ext_list = (struct srp_direct_buf *) |
9413d7b8 | 438 | dma_alloc_coherent(dev, |
ef265673 FT |
439 | SG_ALL * sizeof(struct srp_direct_buf), |
440 | &evt_struct->ext_list_token, 0); | |
4dddbc26 | 441 | if (!evt_struct->ext_list) { |
7912a0ac RJ |
442 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
443 | sdev_printk(KERN_ERR, cmd->device, | |
444 | "Can't allocate memory " | |
445 | "for indirect table\n"); | |
e637d553 | 446 | scsi_dma_unmap(cmd); |
4dddbc26 | 447 | return 0; |
4dddbc26 JB |
448 | } |
449 | } | |
450 | ||
9413d7b8 | 451 | total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list); |
4dddbc26 | 452 | |
ef265673 FT |
453 | indirect->len = total_length; |
454 | indirect->table_desc.va = evt_struct->ext_list_token; | |
455 | indirect->table_desc.len = sg_mapped * sizeof(indirect->desc_list[0]); | |
456 | memcpy(indirect->desc_list, evt_struct->ext_list, | |
457 | MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf)); | |
4dddbc26 | 458 | return 1; |
1da177e4 LT |
459 | } |
460 | ||
1da177e4 LT |
461 | /** |
462 | * map_data_for_srp_cmd: - Calls functions to map data for srp cmds | |
463 | * @cmd: struct scsi_cmnd with the memory to be mapped | |
464 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
465 | * @dev: dma device for which to map dma memory | |
466 | * | |
467 | * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds | |
468 | * Returns 1 on success. | |
469 | */ | |
470 | static int map_data_for_srp_cmd(struct scsi_cmnd *cmd, | |
4dddbc26 | 471 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
472 | struct srp_cmd *srp_cmd, struct device *dev) |
473 | { | |
474 | switch (cmd->sc_data_direction) { | |
475 | case DMA_FROM_DEVICE: | |
476 | case DMA_TO_DEVICE: | |
477 | break; | |
478 | case DMA_NONE: | |
479 | return 1; | |
480 | case DMA_BIDIRECTIONAL: | |
6c0a60ec BK |
481 | sdev_printk(KERN_ERR, cmd->device, |
482 | "Can't map DMA_BIDIRECTIONAL to read/write\n"); | |
1da177e4 LT |
483 | return 0; |
484 | default: | |
6c0a60ec BK |
485 | sdev_printk(KERN_ERR, cmd->device, |
486 | "Unknown data direction 0x%02x; can't map!\n", | |
487 | cmd->sc_data_direction); | |
1da177e4 LT |
488 | return 0; |
489 | } | |
490 | ||
9413d7b8 | 491 | return map_sg_data(cmd, evt_struct, srp_cmd, dev); |
1da177e4 LT |
492 | } |
493 | ||
3d0e91f7 BK |
494 | /** |
495 | * purge_requests: Our virtual adapter just shut down. purge any sent requests | |
496 | * @hostdata: the adapter | |
497 | */ | |
498 | static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code) | |
499 | { | |
500 | struct srp_event_struct *tmp_evt, *pos; | |
501 | unsigned long flags; | |
502 | ||
503 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
504 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { | |
505 | list_del(&tmp_evt->list); | |
506 | del_timer(&tmp_evt->timer); | |
507 | if (tmp_evt->cmnd) { | |
508 | tmp_evt->cmnd->result = (error_code << 16); | |
509 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, | |
510 | tmp_evt, | |
511 | tmp_evt->hostdata->dev); | |
512 | if (tmp_evt->cmnd_done) | |
513 | tmp_evt->cmnd_done(tmp_evt->cmnd); | |
514 | } else if (tmp_evt->done) | |
515 | tmp_evt->done(tmp_evt); | |
516 | free_event_struct(&tmp_evt->hostdata->pool, tmp_evt); | |
517 | } | |
518 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
519 | } | |
520 | ||
521 | /** | |
522 | * ibmvscsi_reset_host - Reset the connection to the server | |
523 | * @hostdata: struct ibmvscsi_host_data to reset | |
524 | */ | |
525 | static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata) | |
526 | { | |
527 | scsi_block_requests(hostdata->host); | |
528 | atomic_set(&hostdata->request_limit, 0); | |
529 | ||
530 | purge_requests(hostdata, DID_ERROR); | |
d3849d51 DW |
531 | if ((ibmvscsi_ops->reset_crq_queue(&hostdata->queue, hostdata)) || |
532 | (ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0)) || | |
3d0e91f7 BK |
533 | (vio_enable_interrupts(to_vio_dev(hostdata->dev)))) { |
534 | atomic_set(&hostdata->request_limit, -1); | |
535 | dev_err(hostdata->dev, "error after reset\n"); | |
536 | } | |
537 | ||
538 | scsi_unblock_requests(hostdata->host); | |
539 | } | |
540 | ||
541 | /** | |
542 | * ibmvscsi_timeout - Internal command timeout handler | |
543 | * @evt_struct: struct srp_event_struct that timed out | |
544 | * | |
545 | * Called when an internally generated command times out | |
546 | */ | |
547 | static void ibmvscsi_timeout(struct srp_event_struct *evt_struct) | |
548 | { | |
549 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
550 | ||
551 | dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n", | |
552 | evt_struct->iu.srp.cmd.opcode); | |
553 | ||
554 | ibmvscsi_reset_host(hostdata); | |
555 | } | |
556 | ||
557 | ||
1da177e4 LT |
558 | /* ------------------------------------------------------------ |
559 | * Routines for sending and receiving SRPs | |
560 | */ | |
561 | /** | |
562 | * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq() | |
563 | * @evt_struct: evt_struct to be sent | |
564 | * @hostdata: ibmvscsi_host_data of host | |
3d0e91f7 | 565 | * @timeout: timeout in seconds - 0 means do not time command |
1da177e4 LT |
566 | * |
567 | * Returns the value returned from ibmvscsi_send_crq(). (Zero for success) | |
568 | * Note that this routine assumes that host_lock is held for synchronization | |
569 | */ | |
570 | static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct, | |
3d0e91f7 BK |
571 | struct ibmvscsi_host_data *hostdata, |
572 | unsigned long timeout) | |
1da177e4 | 573 | { |
1da177e4 | 574 | u64 *crq_as_u64 = (u64 *) &evt_struct->crq; |
3c887e8a | 575 | int request_status = 0; |
1da177e4 LT |
576 | int rc; |
577 | ||
a897ff2a RJ |
578 | /* If we have exhausted our request limit, just fail this request, |
579 | * unless it is for a reset or abort. | |
1da177e4 LT |
580 | * Note that there are rare cases involving driver generated requests |
581 | * (such as task management requests) that the mid layer may think we | |
582 | * can handle more requests (can_queue) when we actually can't | |
583 | */ | |
cefbda2d DB |
584 | if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) { |
585 | request_status = | |
586 | atomic_dec_if_positive(&hostdata->request_limit); | |
587 | /* If request limit was -1 when we started, it is now even | |
588 | * less than that | |
589 | */ | |
590 | if (request_status < -1) | |
591 | goto send_error; | |
a897ff2a | 592 | /* Otherwise, we may have run out of requests. */ |
3c887e8a RJ |
593 | /* If request limit was 0 when we started the adapter is in the |
594 | * process of performing a login with the server adapter, or | |
595 | * we may have run out of requests. | |
596 | */ | |
597 | else if (request_status == -1 && | |
598 | evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ) | |
599 | goto send_busy; | |
a897ff2a RJ |
600 | /* Abort and reset calls should make it through. |
601 | * Nothing except abort and reset should use the last two | |
602 | * slots unless we had two or less to begin with. | |
603 | */ | |
604 | else if (request_status < 2 && | |
605 | evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) { | |
606 | /* In the case that we have less than two requests | |
607 | * available, check the server limit as a combination | |
608 | * of the request limit and the number of requests | |
609 | * in-flight (the size of the send list). If the | |
610 | * server limit is greater than 2, return busy so | |
611 | * that the last two are reserved for reset and abort. | |
612 | */ | |
613 | int server_limit = request_status; | |
614 | struct srp_event_struct *tmp_evt; | |
615 | ||
616 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
617 | server_limit++; | |
618 | } | |
619 | ||
620 | if (server_limit > 2) | |
621 | goto send_busy; | |
622 | } | |
cefbda2d | 623 | } |
1da177e4 LT |
624 | |
625 | /* Copy the IU into the transfer area */ | |
626 | *evt_struct->xfer_iu = evt_struct->iu; | |
ef265673 | 627 | evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct; |
1da177e4 LT |
628 | |
629 | /* Add this to the sent list. We need to do this | |
630 | * before we actually send | |
631 | * in case it comes back REALLY fast | |
632 | */ | |
633 | list_add_tail(&evt_struct->list, &hostdata->sent); | |
634 | ||
3d0e91f7 BK |
635 | init_timer(&evt_struct->timer); |
636 | if (timeout) { | |
637 | evt_struct->timer.data = (unsigned long) evt_struct; | |
638 | evt_struct->timer.expires = jiffies + (timeout * HZ); | |
639 | evt_struct->timer.function = (void (*)(unsigned long))ibmvscsi_timeout; | |
640 | add_timer(&evt_struct->timer); | |
641 | } | |
642 | ||
1da177e4 | 643 | if ((rc = |
d3849d51 | 644 | ibmvscsi_ops->send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) { |
1da177e4 | 645 | list_del(&evt_struct->list); |
3d0e91f7 | 646 | del_timer(&evt_struct->timer); |
1da177e4 | 647 | |
860784c8 RJ |
648 | /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY. |
649 | * Firmware will send a CRQ with a transport event (0xFF) to | |
650 | * tell this client what has happened to the transport. This | |
651 | * will be handled in ibmvscsi_handle_crq() | |
652 | */ | |
653 | if (rc == H_CLOSED) { | |
654 | dev_warn(hostdata->dev, "send warning. " | |
655 | "Receive queue closed, will retry.\n"); | |
656 | goto send_busy; | |
657 | } | |
6c0a60ec | 658 | dev_err(hostdata->dev, "send error %d\n", rc); |
a897ff2a | 659 | atomic_inc(&hostdata->request_limit); |
1da177e4 LT |
660 | goto send_error; |
661 | } | |
662 | ||
663 | return 0; | |
664 | ||
cefbda2d | 665 | send_busy: |
4dddbc26 | 666 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); |
1da177e4 | 667 | |
1da177e4 | 668 | free_event_struct(&hostdata->pool, evt_struct); |
3c887e8a RJ |
669 | if (request_status != -1) |
670 | atomic_inc(&hostdata->request_limit); | |
a897ff2a | 671 | return SCSI_MLQUEUE_HOST_BUSY; |
cefbda2d DB |
672 | |
673 | send_error: | |
674 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); | |
675 | ||
676 | if (evt_struct->cmnd != NULL) { | |
677 | evt_struct->cmnd->result = DID_ERROR << 16; | |
678 | evt_struct->cmnd_done(evt_struct->cmnd); | |
679 | } else if (evt_struct->done) | |
680 | evt_struct->done(evt_struct); | |
681 | ||
682 | free_event_struct(&hostdata->pool, evt_struct); | |
683 | return 0; | |
1da177e4 LT |
684 | } |
685 | ||
686 | /** | |
687 | * handle_cmd_rsp: - Handle responses from commands | |
688 | * @evt_struct: srp_event_struct to be handled | |
689 | * | |
690 | * Used as a callback by when sending scsi cmds. | |
691 | * Gets called by ibmvscsi_handle_crq() | |
692 | */ | |
693 | static void handle_cmd_rsp(struct srp_event_struct *evt_struct) | |
694 | { | |
695 | struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp; | |
696 | struct scsi_cmnd *cmnd = evt_struct->cmnd; | |
697 | ||
ef265673 | 698 | if (unlikely(rsp->opcode != SRP_RSP)) { |
1da177e4 | 699 | if (printk_ratelimit()) |
6c0a60ec BK |
700 | dev_warn(evt_struct->hostdata->dev, |
701 | "bad SRP RSP type %d\n", rsp->opcode); | |
1da177e4 LT |
702 | } |
703 | ||
704 | if (cmnd) { | |
c3a3b55a | 705 | cmnd->result |= rsp->status; |
1da177e4 LT |
706 | if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION) |
707 | memcpy(cmnd->sense_buffer, | |
ef265673 FT |
708 | rsp->data, |
709 | rsp->sense_data_len); | |
1da177e4 | 710 | unmap_cmd_data(&evt_struct->iu.srp.cmd, |
4dddbc26 | 711 | evt_struct, |
1da177e4 LT |
712 | evt_struct->hostdata->dev); |
713 | ||
ef265673 | 714 | if (rsp->flags & SRP_RSP_FLAG_DOOVER) |
9413d7b8 | 715 | scsi_set_resid(cmnd, rsp->data_out_res_cnt); |
ef265673 | 716 | else if (rsp->flags & SRP_RSP_FLAG_DIOVER) |
9413d7b8 | 717 | scsi_set_resid(cmnd, rsp->data_in_res_cnt); |
1da177e4 LT |
718 | } |
719 | ||
720 | if (evt_struct->cmnd_done) | |
721 | evt_struct->cmnd_done(cmnd); | |
722 | } | |
723 | ||
724 | /** | |
725 | * lun_from_dev: - Returns the lun of the scsi device | |
726 | * @dev: struct scsi_device | |
727 | * | |
728 | */ | |
729 | static inline u16 lun_from_dev(struct scsi_device *dev) | |
730 | { | |
731 | return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun; | |
732 | } | |
733 | ||
734 | /** | |
735 | * ibmvscsi_queue: - The queuecommand function of the scsi template | |
736 | * @cmd: struct scsi_cmnd to be executed | |
737 | * @done: Callback function to be called when cmd is completed | |
738 | */ | |
739 | static int ibmvscsi_queuecommand(struct scsi_cmnd *cmnd, | |
740 | void (*done) (struct scsi_cmnd *)) | |
741 | { | |
742 | struct srp_cmd *srp_cmd; | |
743 | struct srp_event_struct *evt_struct; | |
ef265673 | 744 | struct srp_indirect_buf *indirect; |
7603e02e | 745 | struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host); |
1da177e4 | 746 | u16 lun = lun_from_dev(cmnd->device); |
ef265673 | 747 | u8 out_fmt, in_fmt; |
1da177e4 | 748 | |
c3a3b55a | 749 | cmnd->result = (DID_OK << 16); |
1da177e4 LT |
750 | evt_struct = get_event_struct(&hostdata->pool); |
751 | if (!evt_struct) | |
752 | return SCSI_MLQUEUE_HOST_BUSY; | |
753 | ||
1da177e4 LT |
754 | /* Set up the actual SRP IU */ |
755 | srp_cmd = &evt_struct->iu.srp.cmd; | |
ef265673 FT |
756 | memset(srp_cmd, 0x00, SRP_MAX_IU_LEN); |
757 | srp_cmd->opcode = SRP_CMD; | |
64a87b24 | 758 | memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb)); |
1da177e4 LT |
759 | srp_cmd->lun = ((u64) lun) << 48; |
760 | ||
4dddbc26 | 761 | if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) { |
7912a0ac RJ |
762 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
763 | sdev_printk(KERN_ERR, cmnd->device, | |
764 | "couldn't convert cmd to srp_cmd\n"); | |
1da177e4 LT |
765 | free_event_struct(&hostdata->pool, evt_struct); |
766 | return SCSI_MLQUEUE_HOST_BUSY; | |
767 | } | |
768 | ||
4dddbc26 JB |
769 | init_event_struct(evt_struct, |
770 | handle_cmd_rsp, | |
771 | VIOSRP_SRP_FORMAT, | |
242f9dcb | 772 | cmnd->request->timeout/HZ); |
4dddbc26 JB |
773 | |
774 | evt_struct->cmnd = cmnd; | |
775 | evt_struct->cmnd_done = done; | |
776 | ||
1da177e4 | 777 | /* Fix up dma address of the buffer itself */ |
ef265673 FT |
778 | indirect = (struct srp_indirect_buf *) srp_cmd->add_data; |
779 | out_fmt = srp_cmd->buf_fmt >> 4; | |
780 | in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1); | |
781 | if ((in_fmt == SRP_DATA_DESC_INDIRECT || | |
782 | out_fmt == SRP_DATA_DESC_INDIRECT) && | |
783 | indirect->table_desc.va == 0) { | |
784 | indirect->table_desc.va = evt_struct->crq.IU_data_ptr + | |
785 | offsetof(struct srp_cmd, add_data) + | |
786 | offsetof(struct srp_indirect_buf, desc_list); | |
1da177e4 LT |
787 | } |
788 | ||
3d0e91f7 | 789 | return ibmvscsi_send_srp_event(evt_struct, hostdata, 0); |
1da177e4 LT |
790 | } |
791 | ||
792 | /* ------------------------------------------------------------ | |
793 | * Routines for driver initialization | |
794 | */ | |
3507e13f | 795 | |
126c5cc3 BK |
796 | /** |
797 | * map_persist_bufs: - Pre-map persistent data for adapter logins | |
798 | * @hostdata: ibmvscsi_host_data of host | |
799 | * | |
800 | * Map the capabilities and adapter info DMA buffers to avoid runtime failures. | |
801 | * Return 1 on error, 0 on success. | |
802 | */ | |
803 | static int map_persist_bufs(struct ibmvscsi_host_data *hostdata) | |
804 | { | |
805 | ||
806 | hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps, | |
807 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
808 | ||
809 | if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) { | |
810 | dev_err(hostdata->dev, "Unable to map capabilities buffer!\n"); | |
811 | return 1; | |
812 | } | |
813 | ||
814 | hostdata->adapter_info_addr = dma_map_single(hostdata->dev, | |
815 | &hostdata->madapter_info, | |
816 | sizeof(hostdata->madapter_info), | |
817 | DMA_BIDIRECTIONAL); | |
818 | if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) { | |
819 | dev_err(hostdata->dev, "Unable to map adapter info buffer!\n"); | |
820 | dma_unmap_single(hostdata->dev, hostdata->caps_addr, | |
821 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
822 | return 1; | |
823 | } | |
824 | ||
825 | return 0; | |
826 | } | |
827 | ||
828 | /** | |
829 | * unmap_persist_bufs: - Unmap persistent data needed for adapter logins | |
830 | * @hostdata: ibmvscsi_host_data of host | |
831 | * | |
832 | * Unmap the capabilities and adapter info DMA buffers | |
833 | */ | |
834 | static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata) | |
835 | { | |
836 | dma_unmap_single(hostdata->dev, hostdata->caps_addr, | |
837 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
838 | ||
839 | dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr, | |
840 | sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL); | |
841 | } | |
842 | ||
3507e13f BK |
843 | /** |
844 | * login_rsp: - Handle response to SRP login request | |
845 | * @evt_struct: srp_event_struct with the response | |
846 | * | |
847 | * Used as a "done" callback by when sending srp_login. Gets called | |
848 | * by ibmvscsi_handle_crq() | |
849 | */ | |
850 | static void login_rsp(struct srp_event_struct *evt_struct) | |
851 | { | |
852 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
853 | switch (evt_struct->xfer_iu->srp.login_rsp.opcode) { | |
854 | case SRP_LOGIN_RSP: /* it worked! */ | |
855 | break; | |
856 | case SRP_LOGIN_REJ: /* refused! */ | |
857 | dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n", | |
858 | evt_struct->xfer_iu->srp.login_rej.reason); | |
859 | /* Login failed. */ | |
860 | atomic_set(&hostdata->request_limit, -1); | |
861 | return; | |
862 | default: | |
863 | dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n", | |
864 | evt_struct->xfer_iu->srp.login_rsp.opcode); | |
865 | /* Login failed. */ | |
866 | atomic_set(&hostdata->request_limit, -1); | |
867 | return; | |
868 | } | |
869 | ||
870 | dev_info(hostdata->dev, "SRP_LOGIN succeeded\n"); | |
126c5cc3 | 871 | hostdata->client_migrated = 0; |
3507e13f BK |
872 | |
873 | /* Now we know what the real request-limit is. | |
874 | * This value is set rather than added to request_limit because | |
875 | * request_limit could have been set to -1 by this client. | |
876 | */ | |
877 | atomic_set(&hostdata->request_limit, | |
878 | evt_struct->xfer_iu->srp.login_rsp.req_lim_delta); | |
879 | ||
880 | /* If we had any pending I/Os, kick them */ | |
881 | scsi_unblock_requests(hostdata->host); | |
882 | } | |
883 | ||
884 | /** | |
885 | * send_srp_login: - Sends the srp login | |
886 | * @hostdata: ibmvscsi_host_data of host | |
887 | * | |
888 | * Returns zero if successful. | |
889 | */ | |
890 | static int send_srp_login(struct ibmvscsi_host_data *hostdata) | |
891 | { | |
892 | int rc; | |
893 | unsigned long flags; | |
894 | struct srp_login_req *login; | |
895 | struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool); | |
896 | ||
897 | BUG_ON(!evt_struct); | |
898 | init_event_struct(evt_struct, login_rsp, | |
899 | VIOSRP_SRP_FORMAT, login_timeout); | |
900 | ||
901 | login = &evt_struct->iu.srp.login_req; | |
902 | memset(login, 0, sizeof(*login)); | |
903 | login->opcode = SRP_LOGIN_REQ; | |
904 | login->req_it_iu_len = sizeof(union srp_iu); | |
905 | login->req_buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT; | |
906 | ||
907 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
908 | /* Start out with a request limit of 0, since this is negotiated in | |
909 | * the login request we are just sending and login requests always | |
910 | * get sent by the driver regardless of request_limit. | |
911 | */ | |
912 | atomic_set(&hostdata->request_limit, 0); | |
913 | ||
914 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2); | |
915 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
916 | dev_info(hostdata->dev, "sent SRP login\n"); | |
917 | return rc; | |
918 | }; | |
919 | ||
126c5cc3 BK |
920 | /** |
921 | * capabilities_rsp: - Handle response to MAD adapter capabilities request | |
922 | * @evt_struct: srp_event_struct with the response | |
923 | * | |
924 | * Used as a "done" callback by when sending adapter_info. | |
925 | */ | |
926 | static void capabilities_rsp(struct srp_event_struct *evt_struct) | |
927 | { | |
928 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
929 | ||
930 | if (evt_struct->xfer_iu->mad.capabilities.common.status) { | |
931 | dev_err(hostdata->dev, "error 0x%X getting capabilities info\n", | |
932 | evt_struct->xfer_iu->mad.capabilities.common.status); | |
933 | } else { | |
934 | if (hostdata->caps.migration.common.server_support != SERVER_SUPPORTS_CAP) | |
935 | dev_info(hostdata->dev, "Partition migration not supported\n"); | |
936 | ||
937 | if (client_reserve) { | |
938 | if (hostdata->caps.reserve.common.server_support == | |
939 | SERVER_SUPPORTS_CAP) | |
940 | dev_info(hostdata->dev, "Client reserve enabled\n"); | |
941 | else | |
942 | dev_info(hostdata->dev, "Client reserve not supported\n"); | |
943 | } | |
944 | } | |
945 | ||
946 | send_srp_login(hostdata); | |
947 | } | |
948 | ||
949 | /** | |
950 | * send_mad_capabilities: - Sends the mad capabilities request | |
951 | * and stores the result so it can be retrieved with | |
952 | * @hostdata: ibmvscsi_host_data of host | |
953 | */ | |
954 | static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata) | |
955 | { | |
956 | struct viosrp_capabilities *req; | |
957 | struct srp_event_struct *evt_struct; | |
958 | unsigned long flags; | |
959 | struct device_node *of_node = hostdata->dev->archdata.of_node; | |
960 | const char *location; | |
961 | ||
962 | evt_struct = get_event_struct(&hostdata->pool); | |
963 | BUG_ON(!evt_struct); | |
964 | ||
965 | init_event_struct(evt_struct, capabilities_rsp, | |
966 | VIOSRP_MAD_FORMAT, info_timeout); | |
967 | ||
968 | req = &evt_struct->iu.mad.capabilities; | |
969 | memset(req, 0, sizeof(*req)); | |
970 | ||
971 | hostdata->caps.flags = CAP_LIST_SUPPORTED; | |
972 | if (hostdata->client_migrated) | |
973 | hostdata->caps.flags |= CLIENT_MIGRATED; | |
974 | ||
975 | strncpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev), | |
976 | sizeof(hostdata->caps.name)); | |
977 | hostdata->caps.name[sizeof(hostdata->caps.name) - 1] = '\0'; | |
978 | ||
979 | location = of_get_property(of_node, "ibm,loc-code", NULL); | |
980 | location = location ? location : dev_name(hostdata->dev); | |
981 | strncpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc)); | |
982 | hostdata->caps.loc[sizeof(hostdata->caps.loc) - 1] = '\0'; | |
983 | ||
984 | req->common.type = VIOSRP_CAPABILITIES_TYPE; | |
985 | req->buffer = hostdata->caps_addr; | |
986 | ||
987 | hostdata->caps.migration.common.cap_type = MIGRATION_CAPABILITIES; | |
988 | hostdata->caps.migration.common.length = sizeof(hostdata->caps.migration); | |
989 | hostdata->caps.migration.common.server_support = SERVER_SUPPORTS_CAP; | |
990 | hostdata->caps.migration.ecl = 1; | |
991 | ||
992 | if (client_reserve) { | |
993 | hostdata->caps.reserve.common.cap_type = RESERVATION_CAPABILITIES; | |
994 | hostdata->caps.reserve.common.length = sizeof(hostdata->caps.reserve); | |
995 | hostdata->caps.reserve.common.server_support = SERVER_SUPPORTS_CAP; | |
996 | hostdata->caps.reserve.type = CLIENT_RESERVE_SCSI_2; | |
997 | req->common.length = sizeof(hostdata->caps); | |
998 | } else | |
999 | req->common.length = sizeof(hostdata->caps) - sizeof(hostdata->caps.reserve); | |
1000 | ||
1001 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1002 | if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) | |
1003 | dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n"); | |
1004 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1005 | }; | |
1006 | ||
c1988e31 RJ |
1007 | /** |
1008 | * fast_fail_rsp: - Handle response to MAD enable fast fail | |
1009 | * @evt_struct: srp_event_struct with the response | |
1010 | * | |
1011 | * Used as a "done" callback by when sending enable fast fail. Gets called | |
1012 | * by ibmvscsi_handle_crq() | |
1013 | */ | |
1014 | static void fast_fail_rsp(struct srp_event_struct *evt_struct) | |
1015 | { | |
1016 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
1017 | u8 status = evt_struct->xfer_iu->mad.fast_fail.common.status; | |
1018 | ||
1019 | if (status == VIOSRP_MAD_NOT_SUPPORTED) | |
1020 | dev_err(hostdata->dev, "fast_fail not supported in server\n"); | |
1021 | else if (status == VIOSRP_MAD_FAILED) | |
1022 | dev_err(hostdata->dev, "fast_fail request failed\n"); | |
1023 | else if (status != VIOSRP_MAD_SUCCESS) | |
1024 | dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status); | |
1025 | ||
126c5cc3 | 1026 | send_mad_capabilities(hostdata); |
c1988e31 RJ |
1027 | } |
1028 | ||
1029 | /** | |
1030 | * init_host - Start host initialization | |
1031 | * @hostdata: ibmvscsi_host_data of host | |
1032 | * | |
1033 | * Returns zero if successful. | |
1034 | */ | |
1035 | static int enable_fast_fail(struct ibmvscsi_host_data *hostdata) | |
1036 | { | |
1037 | int rc; | |
1038 | unsigned long flags; | |
1039 | struct viosrp_fast_fail *fast_fail_mad; | |
1040 | struct srp_event_struct *evt_struct; | |
1041 | ||
126c5cc3 BK |
1042 | if (!fast_fail) { |
1043 | send_mad_capabilities(hostdata); | |
1044 | return 0; | |
1045 | } | |
c1988e31 RJ |
1046 | |
1047 | evt_struct = get_event_struct(&hostdata->pool); | |
1048 | BUG_ON(!evt_struct); | |
1049 | ||
1050 | init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout); | |
1051 | ||
1052 | fast_fail_mad = &evt_struct->iu.mad.fast_fail; | |
1053 | memset(fast_fail_mad, 0, sizeof(*fast_fail_mad)); | |
1054 | fast_fail_mad->common.type = VIOSRP_ENABLE_FAST_FAIL; | |
1055 | fast_fail_mad->common.length = sizeof(*fast_fail_mad); | |
1056 | ||
1057 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1058 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2); | |
1059 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1060 | return rc; | |
1061 | } | |
1062 | ||
1da177e4 LT |
1063 | /** |
1064 | * adapter_info_rsp: - Handle response to MAD adapter info request | |
1065 | * @evt_struct: srp_event_struct with the response | |
1066 | * | |
1067 | * Used as a "done" callback by when sending adapter_info. Gets called | |
1068 | * by ibmvscsi_handle_crq() | |
1069 | */ | |
1070 | static void adapter_info_rsp(struct srp_event_struct *evt_struct) | |
1071 | { | |
1072 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
1da177e4 LT |
1073 | |
1074 | if (evt_struct->xfer_iu->mad.adapter_info.common.status) { | |
6c0a60ec BK |
1075 | dev_err(hostdata->dev, "error %d getting adapter info\n", |
1076 | evt_struct->xfer_iu->mad.adapter_info.common.status); | |
1da177e4 | 1077 | } else { |
6c0a60ec BK |
1078 | dev_info(hostdata->dev, "host srp version: %s, " |
1079 | "host partition %s (%d), OS %d, max io %u\n", | |
1080 | hostdata->madapter_info.srp_version, | |
1081 | hostdata->madapter_info.partition_name, | |
1082 | hostdata->madapter_info.partition_number, | |
1083 | hostdata->madapter_info.os_type, | |
1084 | hostdata->madapter_info.port_max_txu[0]); | |
1da177e4 LT |
1085 | |
1086 | if (hostdata->madapter_info.port_max_txu[0]) | |
1087 | hostdata->host->max_sectors = | |
1088 | hostdata->madapter_info.port_max_txu[0] >> 9; | |
154fb614 DB |
1089 | |
1090 | if (hostdata->madapter_info.os_type == 3 && | |
1091 | strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) { | |
6c0a60ec BK |
1092 | dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n", |
1093 | hostdata->madapter_info.srp_version); | |
1094 | dev_err(hostdata->dev, "limiting scatterlists to %d\n", | |
1095 | MAX_INDIRECT_BUFS); | |
154fb614 DB |
1096 | hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS; |
1097 | } | |
e08afeb7 BK |
1098 | |
1099 | if (hostdata->madapter_info.os_type == 3) { | |
1100 | enable_fast_fail(hostdata); | |
1101 | return; | |
1102 | } | |
1da177e4 | 1103 | } |
3507e13f | 1104 | |
e08afeb7 | 1105 | send_srp_login(hostdata); |
1da177e4 LT |
1106 | } |
1107 | ||
1108 | /** | |
1109 | * send_mad_adapter_info: - Sends the mad adapter info request | |
1110 | * and stores the result so it can be retrieved with | |
1111 | * sysfs. We COULD consider causing a failure if the | |
1112 | * returned SRP version doesn't match ours. | |
1113 | * @hostdata: ibmvscsi_host_data of host | |
1114 | * | |
1115 | * Returns zero if successful. | |
1116 | */ | |
1117 | static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata) | |
1118 | { | |
1119 | struct viosrp_adapter_info *req; | |
1120 | struct srp_event_struct *evt_struct; | |
06f923cb | 1121 | unsigned long flags; |
e5dbfa66 | 1122 | |
1da177e4 | 1123 | evt_struct = get_event_struct(&hostdata->pool); |
3507e13f | 1124 | BUG_ON(!evt_struct); |
1da177e4 LT |
1125 | |
1126 | init_event_struct(evt_struct, | |
1127 | adapter_info_rsp, | |
1128 | VIOSRP_MAD_FORMAT, | |
e1a5ce5b | 1129 | info_timeout); |
1da177e4 LT |
1130 | |
1131 | req = &evt_struct->iu.mad.adapter_info; | |
1132 | memset(req, 0x00, sizeof(*req)); | |
1133 | ||
1134 | req->common.type = VIOSRP_ADAPTER_INFO_TYPE; | |
1135 | req->common.length = sizeof(hostdata->madapter_info); | |
126c5cc3 | 1136 | req->buffer = hostdata->adapter_info_addr; |
1da177e4 | 1137 | |
06f923cb | 1138 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
126c5cc3 | 1139 | if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) |
6c0a60ec | 1140 | dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n"); |
06f923cb | 1141 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1142 | }; |
1143 | ||
1144 | /** | |
3507e13f | 1145 | * init_adapter: Start virtual adapter initialization sequence |
1da177e4 | 1146 | * |
3507e13f BK |
1147 | */ |
1148 | static void init_adapter(struct ibmvscsi_host_data *hostdata) | |
1da177e4 | 1149 | { |
1da177e4 | 1150 | send_mad_adapter_info(hostdata); |
1da177e4 LT |
1151 | } |
1152 | ||
1da177e4 LT |
1153 | /** |
1154 | * sync_completion: Signal that a synchronous command has completed | |
1155 | * Note that after returning from this call, the evt_struct is freed. | |
1156 | * the caller waiting on this completion shouldn't touch the evt_struct | |
1157 | * again. | |
1158 | */ | |
1159 | static void sync_completion(struct srp_event_struct *evt_struct) | |
1160 | { | |
1161 | /* copy the response back */ | |
1162 | if (evt_struct->sync_srp) | |
1163 | *evt_struct->sync_srp = *evt_struct->xfer_iu; | |
1164 | ||
1165 | complete(&evt_struct->comp); | |
1166 | } | |
1167 | ||
1168 | /** | |
1169 | * ibmvscsi_abort: Abort a command...from scsi host template | |
1170 | * send this over to the server and wait synchronously for the response | |
1171 | */ | |
1172 | static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd) | |
1173 | { | |
7603e02e | 1174 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 LT |
1175 | struct srp_tsk_mgmt *tsk_mgmt; |
1176 | struct srp_event_struct *evt; | |
1177 | struct srp_event_struct *tmp_evt, *found_evt; | |
1178 | union viosrp_iu srp_rsp; | |
1179 | int rsp_rc; | |
be042f24 | 1180 | unsigned long flags; |
1da177e4 | 1181 | u16 lun = lun_from_dev(cmd->device); |
860784c8 | 1182 | unsigned long wait_switch = 0; |
1da177e4 LT |
1183 | |
1184 | /* First, find this command in our sent list so we can figure | |
1185 | * out the correct tag | |
1186 | */ | |
be042f24 | 1187 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
860784c8 RJ |
1188 | wait_switch = jiffies + (init_timeout * HZ); |
1189 | do { | |
1190 | found_evt = NULL; | |
1191 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
1192 | if (tmp_evt->cmnd == cmd) { | |
1193 | found_evt = tmp_evt; | |
1194 | break; | |
1195 | } | |
1da177e4 | 1196 | } |
1da177e4 | 1197 | |
860784c8 RJ |
1198 | if (!found_evt) { |
1199 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1200 | return SUCCESS; | |
1201 | } | |
1da177e4 | 1202 | |
860784c8 RJ |
1203 | evt = get_event_struct(&hostdata->pool); |
1204 | if (evt == NULL) { | |
1205 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1206 | sdev_printk(KERN_ERR, cmd->device, | |
1207 | "failed to allocate abort event\n"); | |
1208 | return FAILED; | |
1209 | } | |
1da177e4 | 1210 | |
860784c8 RJ |
1211 | init_event_struct(evt, |
1212 | sync_completion, | |
1213 | VIOSRP_SRP_FORMAT, | |
e1a5ce5b | 1214 | abort_timeout); |
1da177e4 | 1215 | |
860784c8 | 1216 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
1da177e4 | 1217 | |
860784c8 RJ |
1218 | /* Set up an abort SRP command */ |
1219 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
1220 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
1221 | tsk_mgmt->lun = ((u64) lun) << 48; | |
1222 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK; | |
1223 | tsk_mgmt->task_tag = (u64) found_evt; | |
1224 | ||
1225 | evt->sync_srp = &srp_rsp; | |
1226 | ||
1227 | init_completion(&evt->comp); | |
e1a5ce5b | 1228 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2); |
860784c8 RJ |
1229 | |
1230 | if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) | |
1231 | break; | |
1232 | ||
1233 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1234 | msleep(10); | |
1235 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1236 | } while (time_before(jiffies, wait_switch)); | |
1237 | ||
be042f24 | 1238 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
860784c8 | 1239 | |
be042f24 | 1240 | if (rsp_rc != 0) { |
6c0a60ec BK |
1241 | sdev_printk(KERN_ERR, cmd->device, |
1242 | "failed to send abort() event. rc=%d\n", rsp_rc); | |
1da177e4 LT |
1243 | return FAILED; |
1244 | } | |
1245 | ||
860784c8 | 1246 | sdev_printk(KERN_INFO, cmd->device, |
fe333321 | 1247 | "aborting command. lun 0x%llx, tag 0x%llx\n", |
860784c8 RJ |
1248 | (((u64) lun) << 48), (u64) found_evt); |
1249 | ||
1da177e4 | 1250 | wait_for_completion(&evt->comp); |
1da177e4 LT |
1251 | |
1252 | /* make sure we got a good response */ | |
ef265673 | 1253 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 | 1254 | if (printk_ratelimit()) |
6c0a60ec BK |
1255 | sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n", |
1256 | srp_rsp.srp.rsp.opcode); | |
1da177e4 LT |
1257 | return FAILED; |
1258 | } | |
1259 | ||
ef265673 FT |
1260 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1261 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1262 | else |
1263 | rsp_rc = srp_rsp.srp.rsp.status; | |
1264 | ||
1265 | if (rsp_rc) { | |
1266 | if (printk_ratelimit()) | |
6c0a60ec | 1267 | sdev_printk(KERN_WARNING, cmd->device, |
fe333321 | 1268 | "abort code %d for task tag 0x%llx\n", |
6c0a60ec | 1269 | rsp_rc, tsk_mgmt->task_tag); |
1da177e4 LT |
1270 | return FAILED; |
1271 | } | |
1272 | ||
1273 | /* Because we dropped the spinlock above, it's possible | |
1274 | * The event is no longer in our list. Make sure it didn't | |
1275 | * complete while we were aborting | |
1276 | */ | |
be042f24 | 1277 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1278 | found_evt = NULL; |
1279 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
1280 | if (tmp_evt->cmnd == cmd) { | |
1281 | found_evt = tmp_evt; | |
1282 | break; | |
1283 | } | |
1284 | } | |
1285 | ||
1286 | if (found_evt == NULL) { | |
be042f24 | 1287 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
fe333321 | 1288 | sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n", |
6c0a60ec | 1289 | tsk_mgmt->task_tag); |
1da177e4 LT |
1290 | return SUCCESS; |
1291 | } | |
1292 | ||
fe333321 | 1293 | sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n", |
6c0a60ec | 1294 | tsk_mgmt->task_tag); |
1da177e4 LT |
1295 | |
1296 | cmd->result = (DID_ABORT << 16); | |
1297 | list_del(&found_evt->list); | |
4dddbc26 JB |
1298 | unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt, |
1299 | found_evt->hostdata->dev); | |
1da177e4 | 1300 | free_event_struct(&found_evt->hostdata->pool, found_evt); |
be042f24 | 1301 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1302 | atomic_inc(&hostdata->request_limit); |
1303 | return SUCCESS; | |
1304 | } | |
1305 | ||
1306 | /** | |
1307 | * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host | |
1308 | * template send this over to the server and wait synchronously for the | |
1309 | * response | |
1310 | */ | |
1311 | static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd) | |
1312 | { | |
7603e02e | 1313 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 LT |
1314 | struct srp_tsk_mgmt *tsk_mgmt; |
1315 | struct srp_event_struct *evt; | |
1316 | struct srp_event_struct *tmp_evt, *pos; | |
1317 | union viosrp_iu srp_rsp; | |
1318 | int rsp_rc; | |
be042f24 | 1319 | unsigned long flags; |
1da177e4 | 1320 | u16 lun = lun_from_dev(cmd->device); |
860784c8 | 1321 | unsigned long wait_switch = 0; |
1da177e4 | 1322 | |
be042f24 | 1323 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
860784c8 RJ |
1324 | wait_switch = jiffies + (init_timeout * HZ); |
1325 | do { | |
1326 | evt = get_event_struct(&hostdata->pool); | |
1327 | if (evt == NULL) { | |
1328 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1329 | sdev_printk(KERN_ERR, cmd->device, | |
1330 | "failed to allocate reset event\n"); | |
1331 | return FAILED; | |
1332 | } | |
1da177e4 | 1333 | |
860784c8 RJ |
1334 | init_event_struct(evt, |
1335 | sync_completion, | |
1336 | VIOSRP_SRP_FORMAT, | |
e1a5ce5b | 1337 | reset_timeout); |
1da177e4 | 1338 | |
860784c8 | 1339 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
1da177e4 | 1340 | |
860784c8 RJ |
1341 | /* Set up a lun reset SRP command */ |
1342 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
1343 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
1344 | tsk_mgmt->lun = ((u64) lun) << 48; | |
1345 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET; | |
1da177e4 | 1346 | |
860784c8 RJ |
1347 | evt->sync_srp = &srp_rsp; |
1348 | ||
1349 | init_completion(&evt->comp); | |
e1a5ce5b | 1350 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2); |
860784c8 RJ |
1351 | |
1352 | if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) | |
1353 | break; | |
1354 | ||
1355 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1356 | msleep(10); | |
1357 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1358 | } while (time_before(jiffies, wait_switch)); | |
1da177e4 | 1359 | |
be042f24 | 1360 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
860784c8 | 1361 | |
be042f24 | 1362 | if (rsp_rc != 0) { |
6c0a60ec BK |
1363 | sdev_printk(KERN_ERR, cmd->device, |
1364 | "failed to send reset event. rc=%d\n", rsp_rc); | |
1da177e4 LT |
1365 | return FAILED; |
1366 | } | |
1367 | ||
fe333321 | 1368 | sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n", |
860784c8 RJ |
1369 | (((u64) lun) << 48)); |
1370 | ||
1da177e4 | 1371 | wait_for_completion(&evt->comp); |
1da177e4 LT |
1372 | |
1373 | /* make sure we got a good response */ | |
ef265673 | 1374 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 | 1375 | if (printk_ratelimit()) |
6c0a60ec BK |
1376 | sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n", |
1377 | srp_rsp.srp.rsp.opcode); | |
1da177e4 LT |
1378 | return FAILED; |
1379 | } | |
1380 | ||
ef265673 FT |
1381 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1382 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1383 | else |
1384 | rsp_rc = srp_rsp.srp.rsp.status; | |
1385 | ||
1386 | if (rsp_rc) { | |
1387 | if (printk_ratelimit()) | |
6c0a60ec | 1388 | sdev_printk(KERN_WARNING, cmd->device, |
fe333321 | 1389 | "reset code %d for task tag 0x%llx\n", |
6c0a60ec | 1390 | rsp_rc, tsk_mgmt->task_tag); |
1da177e4 LT |
1391 | return FAILED; |
1392 | } | |
1393 | ||
1394 | /* We need to find all commands for this LUN that have not yet been | |
1395 | * responded to, and fail them with DID_RESET | |
1396 | */ | |
be042f24 | 1397 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1398 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { |
1399 | if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) { | |
1400 | if (tmp_evt->cmnd) | |
1401 | tmp_evt->cmnd->result = (DID_RESET << 16); | |
1402 | list_del(&tmp_evt->list); | |
4dddbc26 JB |
1403 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt, |
1404 | tmp_evt->hostdata->dev); | |
1da177e4 LT |
1405 | free_event_struct(&tmp_evt->hostdata->pool, |
1406 | tmp_evt); | |
1407 | atomic_inc(&hostdata->request_limit); | |
1408 | if (tmp_evt->cmnd_done) | |
1409 | tmp_evt->cmnd_done(tmp_evt->cmnd); | |
1410 | else if (tmp_evt->done) | |
1411 | tmp_evt->done(tmp_evt); | |
1412 | } | |
1413 | } | |
be042f24 | 1414 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1415 | return SUCCESS; |
1416 | } | |
1417 | ||
1418 | /** | |
3d0e91f7 BK |
1419 | * ibmvscsi_eh_host_reset_handler - Reset the connection to the server |
1420 | * @cmd: struct scsi_cmnd having problems | |
1421 | */ | |
1422 | static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd) | |
1da177e4 | 1423 | { |
3d0e91f7 | 1424 | unsigned long wait_switch = 0; |
7603e02e | 1425 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 | 1426 | |
3d0e91f7 BK |
1427 | dev_err(hostdata->dev, "Resetting connection due to error recovery\n"); |
1428 | ||
1429 | ibmvscsi_reset_host(hostdata); | |
1430 | ||
1431 | for (wait_switch = jiffies + (init_timeout * HZ); | |
1432 | time_before(jiffies, wait_switch) && | |
1433 | atomic_read(&hostdata->request_limit) < 2;) { | |
1434 | ||
1435 | msleep(10); | |
1da177e4 | 1436 | } |
3d0e91f7 BK |
1437 | |
1438 | if (atomic_read(&hostdata->request_limit) <= 0) | |
1439 | return FAILED; | |
1440 | ||
1441 | return SUCCESS; | |
1da177e4 LT |
1442 | } |
1443 | ||
1444 | /** | |
1445 | * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ | |
1446 | * @crq: Command/Response queue | |
1447 | * @hostdata: ibmvscsi_host_data of host | |
1448 | * | |
1449 | */ | |
1450 | void ibmvscsi_handle_crq(struct viosrp_crq *crq, | |
1451 | struct ibmvscsi_host_data *hostdata) | |
1452 | { | |
6c0a60ec | 1453 | long rc; |
1da177e4 LT |
1454 | unsigned long flags; |
1455 | struct srp_event_struct *evt_struct = | |
1456 | (struct srp_event_struct *)crq->IU_data_ptr; | |
1457 | switch (crq->valid) { | |
1458 | case 0xC0: /* initialization */ | |
1459 | switch (crq->format) { | |
1460 | case 0x01: /* Initialization message */ | |
6c0a60ec | 1461 | dev_info(hostdata->dev, "partner initialized\n"); |
1da177e4 | 1462 | /* Send back a response */ |
d3849d51 DW |
1463 | if ((rc = ibmvscsi_ops->send_crq(hostdata, |
1464 | 0xC002000000000000LL, 0)) == 0) { | |
1da177e4 | 1465 | /* Now login */ |
3507e13f | 1466 | init_adapter(hostdata); |
1da177e4 | 1467 | } else { |
6c0a60ec | 1468 | dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc); |
1da177e4 LT |
1469 | } |
1470 | ||
1471 | break; | |
1472 | case 0x02: /* Initialization response */ | |
6c0a60ec | 1473 | dev_info(hostdata->dev, "partner initialization complete\n"); |
1da177e4 LT |
1474 | |
1475 | /* Now login */ | |
3507e13f | 1476 | init_adapter(hostdata); |
1da177e4 LT |
1477 | break; |
1478 | default: | |
6c0a60ec | 1479 | dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format); |
1da177e4 LT |
1480 | } |
1481 | return; | |
2b541f8f DB |
1482 | case 0xFF: /* Hypervisor telling us the connection is closed */ |
1483 | scsi_block_requests(hostdata->host); | |
cefbda2d | 1484 | atomic_set(&hostdata->request_limit, 0); |
2b541f8f DB |
1485 | if (crq->format == 0x06) { |
1486 | /* We need to re-setup the interpartition connection */ | |
6c0a60ec | 1487 | dev_info(hostdata->dev, "Re-enabling adapter!\n"); |
126c5cc3 | 1488 | hostdata->client_migrated = 1; |
2b541f8f | 1489 | purge_requests(hostdata, DID_REQUEUE); |
d3849d51 DW |
1490 | if ((ibmvscsi_ops->reenable_crq_queue(&hostdata->queue, |
1491 | hostdata)) || | |
1492 | (ibmvscsi_ops->send_crq(hostdata, | |
1493 | 0xC001000000000000LL, 0))) { | |
cefbda2d DB |
1494 | atomic_set(&hostdata->request_limit, |
1495 | -1); | |
6c0a60ec | 1496 | dev_err(hostdata->dev, "error after enable\n"); |
cefbda2d | 1497 | } |
2b541f8f | 1498 | } else { |
6c0a60ec BK |
1499 | dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n", |
1500 | crq->format); | |
1da177e4 | 1501 | |
2b541f8f | 1502 | purge_requests(hostdata, DID_ERROR); |
d3849d51 DW |
1503 | if ((ibmvscsi_ops->reset_crq_queue(&hostdata->queue, |
1504 | hostdata)) || | |
1505 | (ibmvscsi_ops->send_crq(hostdata, | |
1506 | 0xC001000000000000LL, 0))) { | |
cefbda2d DB |
1507 | atomic_set(&hostdata->request_limit, |
1508 | -1); | |
6c0a60ec | 1509 | dev_err(hostdata->dev, "error after reset\n"); |
cefbda2d | 1510 | } |
2b541f8f DB |
1511 | } |
1512 | scsi_unblock_requests(hostdata->host); | |
1da177e4 LT |
1513 | return; |
1514 | case 0x80: /* real payload */ | |
1515 | break; | |
1516 | default: | |
6c0a60ec BK |
1517 | dev_err(hostdata->dev, "got an invalid message type 0x%02x\n", |
1518 | crq->valid); | |
1da177e4 LT |
1519 | return; |
1520 | } | |
1521 | ||
1522 | /* The only kind of payload CRQs we should get are responses to | |
1523 | * things we send. Make sure this response is to something we | |
1524 | * actually sent | |
1525 | */ | |
1526 | if (!valid_event_struct(&hostdata->pool, evt_struct)) { | |
6c0a60ec | 1527 | dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n", |
1da177e4 LT |
1528 | (void *)crq->IU_data_ptr); |
1529 | return; | |
1530 | } | |
1531 | ||
1532 | if (atomic_read(&evt_struct->free)) { | |
6c0a60ec BK |
1533 | dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n", |
1534 | (void *)crq->IU_data_ptr); | |
1da177e4 LT |
1535 | return; |
1536 | } | |
1537 | ||
1538 | if (crq->format == VIOSRP_SRP_FORMAT) | |
ef265673 | 1539 | atomic_add(evt_struct->xfer_iu->srp.rsp.req_lim_delta, |
1da177e4 LT |
1540 | &hostdata->request_limit); |
1541 | ||
3d0e91f7 BK |
1542 | del_timer(&evt_struct->timer); |
1543 | ||
ca61668b | 1544 | if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd) |
c3a3b55a | 1545 | evt_struct->cmnd->result = DID_ERROR << 16; |
1da177e4 LT |
1546 | if (evt_struct->done) |
1547 | evt_struct->done(evt_struct); | |
1548 | else | |
6c0a60ec | 1549 | dev_err(hostdata->dev, "returned done() is NULL; not running it!\n"); |
1da177e4 LT |
1550 | |
1551 | /* | |
1552 | * Lock the host_lock before messing with these structures, since we | |
1553 | * are running in a task context | |
1554 | */ | |
1555 | spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags); | |
1556 | list_del(&evt_struct->list); | |
1557 | free_event_struct(&evt_struct->hostdata->pool, evt_struct); | |
1558 | spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags); | |
1559 | } | |
1560 | ||
1561 | /** | |
1562 | * ibmvscsi_get_host_config: Send the command to the server to get host | |
1563 | * configuration data. The data is opaque to us. | |
1564 | */ | |
1565 | static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata, | |
1566 | unsigned char *buffer, int length) | |
1567 | { | |
1568 | struct viosrp_host_config *host_config; | |
1569 | struct srp_event_struct *evt_struct; | |
06f923cb | 1570 | unsigned long flags; |
e5dbfa66 | 1571 | dma_addr_t addr; |
1da177e4 LT |
1572 | int rc; |
1573 | ||
1574 | evt_struct = get_event_struct(&hostdata->pool); | |
1575 | if (!evt_struct) { | |
6c0a60ec | 1576 | dev_err(hostdata->dev, "couldn't allocate event for HOST_CONFIG!\n"); |
1da177e4 LT |
1577 | return -1; |
1578 | } | |
1579 | ||
1580 | init_event_struct(evt_struct, | |
1581 | sync_completion, | |
1582 | VIOSRP_MAD_FORMAT, | |
e1a5ce5b | 1583 | info_timeout); |
1da177e4 LT |
1584 | |
1585 | host_config = &evt_struct->iu.mad.host_config; | |
1586 | ||
1587 | /* Set up a lun reset SRP command */ | |
1588 | memset(host_config, 0x00, sizeof(*host_config)); | |
1589 | host_config->common.type = VIOSRP_HOST_CONFIG_TYPE; | |
1590 | host_config->common.length = length; | |
e5dbfa66 FT |
1591 | host_config->buffer = addr = dma_map_single(hostdata->dev, buffer, |
1592 | length, | |
1593 | DMA_BIDIRECTIONAL); | |
1da177e4 | 1594 | |
8d8bb39b | 1595 | if (dma_mapping_error(hostdata->dev, host_config->buffer)) { |
7912a0ac RJ |
1596 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
1597 | dev_err(hostdata->dev, | |
1598 | "dma_mapping error getting host config\n"); | |
1da177e4 LT |
1599 | free_event_struct(&hostdata->pool, evt_struct); |
1600 | return -1; | |
1601 | } | |
1602 | ||
1603 | init_completion(&evt_struct->comp); | |
06f923cb | 1604 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
e1a5ce5b | 1605 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2); |
06f923cb | 1606 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
e5dbfa66 | 1607 | if (rc == 0) |
1da177e4 | 1608 | wait_for_completion(&evt_struct->comp); |
e5dbfa66 | 1609 | dma_unmap_single(hostdata->dev, addr, length, DMA_BIDIRECTIONAL); |
1da177e4 LT |
1610 | |
1611 | return rc; | |
1612 | } | |
1613 | ||
0979c84b RJ |
1614 | /** |
1615 | * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk. | |
1616 | * @sdev: struct scsi_device device to configure | |
1617 | * | |
1618 | * Enable allow_restart for a device if it is a disk. Adjust the | |
1619 | * queue_depth here also as is required by the documentation for | |
1620 | * struct scsi_host_template. | |
1621 | */ | |
1622 | static int ibmvscsi_slave_configure(struct scsi_device *sdev) | |
1623 | { | |
1624 | struct Scsi_Host *shost = sdev->host; | |
1625 | unsigned long lock_flags = 0; | |
1626 | ||
1627 | spin_lock_irqsave(shost->host_lock, lock_flags); | |
d1a357fc | 1628 | if (sdev->type == TYPE_DISK) { |
0979c84b | 1629 | sdev->allow_restart = 1; |
e1a5ce5b | 1630 | blk_queue_rq_timeout(sdev->request_queue, 120 * HZ); |
d1a357fc | 1631 | } |
0979c84b RJ |
1632 | scsi_adjust_queue_depth(sdev, 0, shost->cmd_per_lun); |
1633 | spin_unlock_irqrestore(shost->host_lock, lock_flags); | |
1634 | return 0; | |
1635 | } | |
1636 | ||
742d25b8 BK |
1637 | /** |
1638 | * ibmvscsi_change_queue_depth - Change the device's queue depth | |
1639 | * @sdev: scsi device struct | |
1640 | * @qdepth: depth to set | |
e881a172 | 1641 | * @reason: calling context |
742d25b8 BK |
1642 | * |
1643 | * Return value: | |
1644 | * actual depth set | |
1645 | **/ | |
e881a172 MC |
1646 | static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth, |
1647 | int reason) | |
742d25b8 | 1648 | { |
e881a172 MC |
1649 | if (reason != SCSI_QDEPTH_DEFAULT) |
1650 | return -EOPNOTSUPP; | |
1651 | ||
742d25b8 BK |
1652 | if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN) |
1653 | qdepth = IBMVSCSI_MAX_CMDS_PER_LUN; | |
1654 | ||
1655 | scsi_adjust_queue_depth(sdev, 0, qdepth); | |
1656 | return sdev->queue_depth; | |
1657 | } | |
1658 | ||
1da177e4 LT |
1659 | /* ------------------------------------------------------------ |
1660 | * sysfs attributes | |
1661 | */ | |
126c5cc3 BK |
1662 | static ssize_t show_host_vhost_loc(struct device *dev, |
1663 | struct device_attribute *attr, char *buf) | |
1664 | { | |
1665 | struct Scsi_Host *shost = class_to_shost(dev); | |
1666 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); | |
1667 | int len; | |
1668 | ||
1669 | len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n", | |
1670 | hostdata->caps.loc); | |
1671 | return len; | |
1672 | } | |
1673 | ||
1674 | static struct device_attribute ibmvscsi_host_vhost_loc = { | |
1675 | .attr = { | |
1676 | .name = "vhost_loc", | |
1677 | .mode = S_IRUGO, | |
1678 | }, | |
1679 | .show = show_host_vhost_loc, | |
1680 | }; | |
1681 | ||
1682 | static ssize_t show_host_vhost_name(struct device *dev, | |
1683 | struct device_attribute *attr, char *buf) | |
1684 | { | |
1685 | struct Scsi_Host *shost = class_to_shost(dev); | |
1686 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); | |
1687 | int len; | |
1688 | ||
1689 | len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n", | |
1690 | hostdata->caps.name); | |
1691 | return len; | |
1692 | } | |
1693 | ||
1694 | static struct device_attribute ibmvscsi_host_vhost_name = { | |
1695 | .attr = { | |
1696 | .name = "vhost_name", | |
1697 | .mode = S_IRUGO, | |
1698 | }, | |
1699 | .show = show_host_vhost_name, | |
1700 | }; | |
1701 | ||
ee959b00 TJ |
1702 | static ssize_t show_host_srp_version(struct device *dev, |
1703 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1704 | { |
ee959b00 | 1705 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1706 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1707 | int len; |
1708 | ||
1709 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1710 | hostdata->madapter_info.srp_version); | |
1711 | return len; | |
1712 | } | |
1713 | ||
ee959b00 | 1714 | static struct device_attribute ibmvscsi_host_srp_version = { |
1da177e4 LT |
1715 | .attr = { |
1716 | .name = "srp_version", | |
1717 | .mode = S_IRUGO, | |
1718 | }, | |
1719 | .show = show_host_srp_version, | |
1720 | }; | |
1721 | ||
ee959b00 TJ |
1722 | static ssize_t show_host_partition_name(struct device *dev, |
1723 | struct device_attribute *attr, | |
1da177e4 LT |
1724 | char *buf) |
1725 | { | |
ee959b00 | 1726 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1727 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1728 | int len; |
1729 | ||
1730 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1731 | hostdata->madapter_info.partition_name); | |
1732 | return len; | |
1733 | } | |
1734 | ||
ee959b00 | 1735 | static struct device_attribute ibmvscsi_host_partition_name = { |
1da177e4 LT |
1736 | .attr = { |
1737 | .name = "partition_name", | |
1738 | .mode = S_IRUGO, | |
1739 | }, | |
1740 | .show = show_host_partition_name, | |
1741 | }; | |
1742 | ||
ee959b00 TJ |
1743 | static ssize_t show_host_partition_number(struct device *dev, |
1744 | struct device_attribute *attr, | |
1da177e4 LT |
1745 | char *buf) |
1746 | { | |
ee959b00 | 1747 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1748 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1749 | int len; |
1750 | ||
1751 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
1752 | hostdata->madapter_info.partition_number); | |
1753 | return len; | |
1754 | } | |
1755 | ||
ee959b00 | 1756 | static struct device_attribute ibmvscsi_host_partition_number = { |
1da177e4 LT |
1757 | .attr = { |
1758 | .name = "partition_number", | |
1759 | .mode = S_IRUGO, | |
1760 | }, | |
1761 | .show = show_host_partition_number, | |
1762 | }; | |
1763 | ||
ee959b00 TJ |
1764 | static ssize_t show_host_mad_version(struct device *dev, |
1765 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1766 | { |
ee959b00 | 1767 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1768 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1769 | int len; |
1770 | ||
1771 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
1772 | hostdata->madapter_info.mad_version); | |
1773 | return len; | |
1774 | } | |
1775 | ||
ee959b00 | 1776 | static struct device_attribute ibmvscsi_host_mad_version = { |
1da177e4 LT |
1777 | .attr = { |
1778 | .name = "mad_version", | |
1779 | .mode = S_IRUGO, | |
1780 | }, | |
1781 | .show = show_host_mad_version, | |
1782 | }; | |
1783 | ||
ee959b00 TJ |
1784 | static ssize_t show_host_os_type(struct device *dev, |
1785 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1786 | { |
ee959b00 | 1787 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1788 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1789 | int len; |
1790 | ||
1791 | len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type); | |
1792 | return len; | |
1793 | } | |
1794 | ||
ee959b00 | 1795 | static struct device_attribute ibmvscsi_host_os_type = { |
1da177e4 LT |
1796 | .attr = { |
1797 | .name = "os_type", | |
1798 | .mode = S_IRUGO, | |
1799 | }, | |
1800 | .show = show_host_os_type, | |
1801 | }; | |
1802 | ||
ee959b00 TJ |
1803 | static ssize_t show_host_config(struct device *dev, |
1804 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1805 | { |
ee959b00 | 1806 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1807 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1808 | |
1809 | /* returns null-terminated host config data */ | |
1810 | if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0) | |
1811 | return strlen(buf); | |
1812 | else | |
1813 | return 0; | |
1814 | } | |
1815 | ||
ee959b00 | 1816 | static struct device_attribute ibmvscsi_host_config = { |
1da177e4 LT |
1817 | .attr = { |
1818 | .name = "config", | |
1819 | .mode = S_IRUGO, | |
1820 | }, | |
1821 | .show = show_host_config, | |
1822 | }; | |
1823 | ||
ee959b00 | 1824 | static struct device_attribute *ibmvscsi_attrs[] = { |
126c5cc3 BK |
1825 | &ibmvscsi_host_vhost_loc, |
1826 | &ibmvscsi_host_vhost_name, | |
1da177e4 LT |
1827 | &ibmvscsi_host_srp_version, |
1828 | &ibmvscsi_host_partition_name, | |
1829 | &ibmvscsi_host_partition_number, | |
1830 | &ibmvscsi_host_mad_version, | |
1831 | &ibmvscsi_host_os_type, | |
1832 | &ibmvscsi_host_config, | |
1833 | NULL | |
1834 | }; | |
1835 | ||
1836 | /* ------------------------------------------------------------ | |
1837 | * SCSI driver registration | |
1838 | */ | |
1839 | static struct scsi_host_template driver_template = { | |
1840 | .module = THIS_MODULE, | |
1841 | .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION, | |
1842 | .proc_name = "ibmvscsi", | |
1843 | .queuecommand = ibmvscsi_queuecommand, | |
1844 | .eh_abort_handler = ibmvscsi_eh_abort_handler, | |
1845 | .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler, | |
3d0e91f7 | 1846 | .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler, |
0979c84b | 1847 | .slave_configure = ibmvscsi_slave_configure, |
742d25b8 | 1848 | .change_queue_depth = ibmvscsi_change_queue_depth, |
7912a0ac | 1849 | .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT, |
a897ff2a | 1850 | .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT, |
1da177e4 | 1851 | .this_id = -1, |
4dddbc26 | 1852 | .sg_tablesize = SG_ALL, |
1da177e4 LT |
1853 | .use_clustering = ENABLE_CLUSTERING, |
1854 | .shost_attrs = ibmvscsi_attrs, | |
1855 | }; | |
1856 | ||
7912a0ac RJ |
1857 | /** |
1858 | * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver | |
1859 | * | |
1860 | * @vdev: struct vio_dev for the device whose desired IO mem is to be returned | |
1861 | * | |
1862 | * Return value: | |
1863 | * Number of bytes of IO data the driver will need to perform well. | |
1864 | */ | |
1865 | static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev) | |
1866 | { | |
1867 | /* iu_storage data allocated in initialize_event_pool */ | |
4f10aae0 | 1868 | unsigned long desired_io = max_events * sizeof(union viosrp_iu); |
7912a0ac RJ |
1869 | |
1870 | /* add io space for sg data */ | |
004dd5e8 | 1871 | desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 * |
7912a0ac RJ |
1872 | IBMVSCSI_CMDS_PER_LUN_DEFAULT); |
1873 | ||
1874 | return desired_io; | |
1875 | } | |
1876 | ||
1da177e4 LT |
1877 | /** |
1878 | * Called by bus code for each adapter | |
1879 | */ | |
1880 | static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id) | |
1881 | { | |
1882 | struct ibmvscsi_host_data *hostdata; | |
1883 | struct Scsi_Host *host; | |
1884 | struct device *dev = &vdev->dev; | |
4d680419 FT |
1885 | struct srp_rport_identifiers ids; |
1886 | struct srp_rport *rport; | |
1da177e4 | 1887 | unsigned long wait_switch = 0; |
cefbda2d | 1888 | int rc; |
1da177e4 | 1889 | |
559fde70 | 1890 | dev_set_drvdata(&vdev->dev, NULL); |
1da177e4 LT |
1891 | |
1892 | host = scsi_host_alloc(&driver_template, sizeof(*hostdata)); | |
1893 | if (!host) { | |
6c0a60ec | 1894 | dev_err(&vdev->dev, "couldn't allocate host data\n"); |
1da177e4 LT |
1895 | goto scsi_host_alloc_failed; |
1896 | } | |
1897 | ||
4d680419 | 1898 | host->transportt = ibmvscsi_transport_template; |
7603e02e | 1899 | hostdata = shost_priv(host); |
1da177e4 LT |
1900 | memset(hostdata, 0x00, sizeof(*hostdata)); |
1901 | INIT_LIST_HEAD(&hostdata->sent); | |
1902 | hostdata->host = host; | |
1903 | hostdata->dev = dev; | |
1904 | atomic_set(&hostdata->request_limit, -1); | |
7912a0ac | 1905 | hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT; |
1da177e4 | 1906 | |
126c5cc3 BK |
1907 | if (map_persist_bufs(hostdata)) { |
1908 | dev_err(&vdev->dev, "couldn't map persistent buffers\n"); | |
1909 | goto persist_bufs_failed; | |
1910 | } | |
1911 | ||
4f10aae0 | 1912 | rc = ibmvscsi_ops->init_crq_queue(&hostdata->queue, hostdata, max_events); |
cefbda2d | 1913 | if (rc != 0 && rc != H_RESOURCE) { |
6c0a60ec | 1914 | dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc); |
1da177e4 LT |
1915 | goto init_crq_failed; |
1916 | } | |
4f10aae0 | 1917 | if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) { |
6c0a60ec | 1918 | dev_err(&vdev->dev, "couldn't initialize event pool\n"); |
1da177e4 LT |
1919 | goto init_pool_failed; |
1920 | } | |
1921 | ||
1922 | host->max_lun = 8; | |
1923 | host->max_id = max_id; | |
1924 | host->max_channel = max_channel; | |
fbc56f08 | 1925 | host->max_cmd_len = 16; |
1da177e4 LT |
1926 | |
1927 | if (scsi_add_host(hostdata->host, hostdata->dev)) | |
1928 | goto add_host_failed; | |
1929 | ||
4d680419 FT |
1930 | /* we don't have a proper target_port_id so let's use the fake one */ |
1931 | memcpy(ids.port_id, hostdata->madapter_info.partition_name, | |
1932 | sizeof(ids.port_id)); | |
aebd5e47 | 1933 | ids.roles = SRP_RPORT_ROLE_TARGET; |
4d680419 FT |
1934 | rport = srp_rport_add(host, &ids); |
1935 | if (IS_ERR(rport)) | |
1936 | goto add_srp_port_failed; | |
1937 | ||
1da177e4 LT |
1938 | /* Try to send an initialization message. Note that this is allowed |
1939 | * to fail if the other end is not acive. In that case we don't | |
1940 | * want to scan | |
1941 | */ | |
d3849d51 | 1942 | if (ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0) == 0 |
cefbda2d | 1943 | || rc == H_RESOURCE) { |
1da177e4 LT |
1944 | /* |
1945 | * Wait around max init_timeout secs for the adapter to finish | |
1946 | * initializing. When we are done initializing, we will have a | |
1947 | * valid request_limit. We don't want Linux scanning before | |
1948 | * we are ready. | |
1949 | */ | |
1950 | for (wait_switch = jiffies + (init_timeout * HZ); | |
1951 | time_before(jiffies, wait_switch) && | |
1952 | atomic_read(&hostdata->request_limit) < 2;) { | |
1953 | ||
1954 | msleep(10); | |
1955 | } | |
1956 | ||
1957 | /* if we now have a valid request_limit, initiate a scan */ | |
1958 | if (atomic_read(&hostdata->request_limit) > 0) | |
1959 | scsi_scan_host(host); | |
1960 | } | |
1961 | ||
559fde70 | 1962 | dev_set_drvdata(&vdev->dev, hostdata); |
1da177e4 LT |
1963 | return 0; |
1964 | ||
4d680419 FT |
1965 | add_srp_port_failed: |
1966 | scsi_remove_host(hostdata->host); | |
1da177e4 LT |
1967 | add_host_failed: |
1968 | release_event_pool(&hostdata->pool, hostdata); | |
1969 | init_pool_failed: | |
4f10aae0 | 1970 | ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata, max_events); |
1da177e4 | 1971 | init_crq_failed: |
126c5cc3 BK |
1972 | unmap_persist_bufs(hostdata); |
1973 | persist_bufs_failed: | |
1da177e4 LT |
1974 | scsi_host_put(host); |
1975 | scsi_host_alloc_failed: | |
1976 | return -1; | |
1977 | } | |
1978 | ||
1979 | static int ibmvscsi_remove(struct vio_dev *vdev) | |
1980 | { | |
559fde70 | 1981 | struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev); |
126c5cc3 | 1982 | unmap_persist_bufs(hostdata); |
1da177e4 | 1983 | release_event_pool(&hostdata->pool, hostdata); |
d3849d51 | 1984 | ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata, |
4f10aae0 | 1985 | max_events); |
4d680419 FT |
1986 | |
1987 | srp_remove_host(hostdata->host); | |
1da177e4 LT |
1988 | scsi_remove_host(hostdata->host); |
1989 | scsi_host_put(hostdata->host); | |
1990 | ||
1991 | return 0; | |
1992 | } | |
1993 | ||
64355b92 BK |
1994 | /** |
1995 | * ibmvscsi_resume: Resume from suspend | |
1996 | * @dev: device struct | |
1997 | * | |
1998 | * We may have lost an interrupt across suspend/resume, so kick the | |
1999 | * interrupt handler | |
2000 | */ | |
2001 | static int ibmvscsi_resume(struct device *dev) | |
2002 | { | |
2003 | struct ibmvscsi_host_data *hostdata = dev_get_drvdata(dev); | |
2004 | return ibmvscsi_ops->resume(hostdata); | |
2005 | } | |
2006 | ||
1da177e4 LT |
2007 | /** |
2008 | * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we | |
2009 | * support. | |
2010 | */ | |
2011 | static struct vio_device_id ibmvscsi_device_table[] __devinitdata = { | |
2012 | {"vscsi", "IBM,v-scsi"}, | |
fb120da6 | 2013 | { "", "" } |
1da177e4 | 2014 | }; |
1da177e4 | 2015 | MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table); |
915124d8 | 2016 | |
64355b92 BK |
2017 | static struct dev_pm_ops ibmvscsi_pm_ops = { |
2018 | .resume = ibmvscsi_resume | |
2019 | }; | |
2020 | ||
1da177e4 | 2021 | static struct vio_driver ibmvscsi_driver = { |
1da177e4 LT |
2022 | .id_table = ibmvscsi_device_table, |
2023 | .probe = ibmvscsi_probe, | |
6fdf5392 | 2024 | .remove = ibmvscsi_remove, |
7912a0ac | 2025 | .get_desired_dma = ibmvscsi_get_desired_dma, |
6fdf5392 SR |
2026 | .driver = { |
2027 | .name = "ibmvscsi", | |
915124d8 | 2028 | .owner = THIS_MODULE, |
64355b92 | 2029 | .pm = &ibmvscsi_pm_ops, |
6fdf5392 | 2030 | } |
1da177e4 LT |
2031 | }; |
2032 | ||
4d680419 FT |
2033 | static struct srp_function_template ibmvscsi_transport_functions = { |
2034 | }; | |
2035 | ||
1da177e4 LT |
2036 | int __init ibmvscsi_module_init(void) |
2037 | { | |
4d680419 FT |
2038 | int ret; |
2039 | ||
4f10aae0 BK |
2040 | /* Ensure we have two requests to do error recovery */ |
2041 | driver_template.can_queue = max_requests; | |
2042 | max_events = max_requests + 2; | |
2043 | ||
d3849d51 DW |
2044 | if (firmware_has_feature(FW_FEATURE_ISERIES)) |
2045 | ibmvscsi_ops = &iseriesvscsi_ops; | |
2046 | else if (firmware_has_feature(FW_FEATURE_VIO)) | |
2047 | ibmvscsi_ops = &rpavscsi_ops; | |
2048 | else | |
2049 | return -ENODEV; | |
2050 | ||
4d680419 FT |
2051 | ibmvscsi_transport_template = |
2052 | srp_attach_transport(&ibmvscsi_transport_functions); | |
2053 | if (!ibmvscsi_transport_template) | |
2054 | return -ENOMEM; | |
2055 | ||
2056 | ret = vio_register_driver(&ibmvscsi_driver); | |
2057 | if (ret) | |
2058 | srp_release_transport(ibmvscsi_transport_template); | |
2059 | return ret; | |
1da177e4 LT |
2060 | } |
2061 | ||
2062 | void __exit ibmvscsi_module_exit(void) | |
2063 | { | |
2064 | vio_unregister_driver(&ibmvscsi_driver); | |
4d680419 | 2065 | srp_release_transport(ibmvscsi_transport_template); |
1da177e4 LT |
2066 | } |
2067 | ||
2068 | module_init(ibmvscsi_module_init); | |
2069 | module_exit(ibmvscsi_module_exit); |