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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 | * | |
7834799a | 58 | * TODO: This is currently pretty tied to the IBM pSeries hypervisor |
1da177e4 LT |
59 | * interfaces. It would be really nice to abstract this above an RDMA |
60 | * layer. | |
61 | */ | |
62 | ||
63 | #include <linux/module.h> | |
64 | #include <linux/moduleparam.h> | |
65 | #include <linux/dma-mapping.h> | |
66 | #include <linux/delay.h> | |
5a0e3ad6 | 67 | #include <linux/slab.h> |
126c5cc3 | 68 | #include <linux/of.h> |
64355b92 | 69 | #include <linux/pm.h> |
0f33ece5 | 70 | #include <linux/kthread.h> |
d3849d51 | 71 | #include <asm/firmware.h> |
1da177e4 LT |
72 | #include <asm/vio.h> |
73 | #include <scsi/scsi.h> | |
74 | #include <scsi/scsi_cmnd.h> | |
75 | #include <scsi/scsi_host.h> | |
76 | #include <scsi/scsi_device.h> | |
4d680419 | 77 | #include <scsi/scsi_transport_srp.h> |
1da177e4 LT |
78 | #include "ibmvscsi.h" |
79 | ||
80 | /* The values below are somewhat arbitrary default values, but | |
81 | * OS/400 will use 3 busses (disks, CDs, tapes, I think.) | |
82 | * Note that there are 3 bits of channel value, 6 bits of id, and | |
83 | * 5 bits of LUN. | |
84 | */ | |
85 | static int max_id = 64; | |
86 | static int max_channel = 3; | |
e1a5ce5b RJ |
87 | static int init_timeout = 300; |
88 | static int login_timeout = 60; | |
89 | static int info_timeout = 30; | |
90 | static int abort_timeout = 60; | |
91 | static int reset_timeout = 60; | |
a897ff2a | 92 | static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT; |
4f10aae0 | 93 | static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2; |
c1988e31 | 94 | static int fast_fail = 1; |
126c5cc3 | 95 | static int client_reserve = 1; |
1da177e4 | 96 | |
4d680419 FT |
97 | static struct scsi_transport_template *ibmvscsi_transport_template; |
98 | ||
aac3118d | 99 | #define IBMVSCSI_VERSION "1.5.9" |
1da177e4 | 100 | |
d3849d51 DW |
101 | static struct ibmvscsi_ops *ibmvscsi_ops; |
102 | ||
1da177e4 LT |
103 | MODULE_DESCRIPTION("IBM Virtual SCSI"); |
104 | MODULE_AUTHOR("Dave Boutcher"); | |
105 | MODULE_LICENSE("GPL"); | |
106 | MODULE_VERSION(IBMVSCSI_VERSION); | |
107 | ||
108 | module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR); | |
109 | MODULE_PARM_DESC(max_id, "Largest ID value for each channel"); | |
110 | module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR); | |
111 | MODULE_PARM_DESC(max_channel, "Largest channel value"); | |
112 | module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR); | |
113 | MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds"); | |
21465eda | 114 | module_param_named(max_requests, max_requests, int, S_IRUGO); |
1da177e4 | 115 | MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter"); |
c1988e31 RJ |
116 | module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR); |
117 | MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]"); | |
126c5cc3 BK |
118 | module_param_named(client_reserve, client_reserve, int, S_IRUGO ); |
119 | MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release"); | |
1da177e4 LT |
120 | |
121 | /* ------------------------------------------------------------ | |
122 | * Routines for the event pool and event structs | |
123 | */ | |
124 | /** | |
125 | * initialize_event_pool: - Allocates and initializes the event pool for a host | |
126 | * @pool: event_pool to be initialized | |
127 | * @size: Number of events in pool | |
128 | * @hostdata: ibmvscsi_host_data who owns the event pool | |
129 | * | |
130 | * Returns zero on success. | |
131 | */ | |
132 | static int initialize_event_pool(struct event_pool *pool, | |
133 | int size, struct ibmvscsi_host_data *hostdata) | |
134 | { | |
135 | int i; | |
136 | ||
137 | pool->size = size; | |
138 | pool->next = 0; | |
4c021dd1 | 139 | pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL); |
1da177e4 LT |
140 | if (!pool->events) |
141 | return -ENOMEM; | |
1da177e4 LT |
142 | |
143 | pool->iu_storage = | |
144 | dma_alloc_coherent(hostdata->dev, | |
145 | pool->size * sizeof(*pool->iu_storage), | |
146 | &pool->iu_token, 0); | |
147 | if (!pool->iu_storage) { | |
148 | kfree(pool->events); | |
149 | return -ENOMEM; | |
150 | } | |
151 | ||
152 | for (i = 0; i < pool->size; ++i) { | |
153 | struct srp_event_struct *evt = &pool->events[i]; | |
154 | memset(&evt->crq, 0x00, sizeof(evt->crq)); | |
155 | atomic_set(&evt->free, 1); | |
156 | evt->crq.valid = 0x80; | |
157 | evt->crq.IU_length = sizeof(*evt->xfer_iu); | |
158 | evt->crq.IU_data_ptr = pool->iu_token + | |
159 | sizeof(*evt->xfer_iu) * i; | |
160 | evt->xfer_iu = pool->iu_storage + i; | |
161 | evt->hostdata = hostdata; | |
4dddbc26 JB |
162 | evt->ext_list = NULL; |
163 | evt->ext_list_token = 0; | |
1da177e4 LT |
164 | } |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
169 | /** | |
170 | * release_event_pool: - Frees memory of an event pool of a host | |
171 | * @pool: event_pool to be released | |
172 | * @hostdata: ibmvscsi_host_data who owns the even pool | |
173 | * | |
174 | * Returns zero on success. | |
175 | */ | |
176 | static void release_event_pool(struct event_pool *pool, | |
177 | struct ibmvscsi_host_data *hostdata) | |
178 | { | |
179 | int i, in_use = 0; | |
4dddbc26 | 180 | for (i = 0; i < pool->size; ++i) { |
1da177e4 LT |
181 | if (atomic_read(&pool->events[i].free) != 1) |
182 | ++in_use; | |
4dddbc26 JB |
183 | if (pool->events[i].ext_list) { |
184 | dma_free_coherent(hostdata->dev, | |
ef265673 | 185 | SG_ALL * sizeof(struct srp_direct_buf), |
4dddbc26 JB |
186 | pool->events[i].ext_list, |
187 | pool->events[i].ext_list_token); | |
188 | } | |
189 | } | |
1da177e4 | 190 | if (in_use) |
6c0a60ec BK |
191 | dev_warn(hostdata->dev, "releasing event pool with %d " |
192 | "events still in use?\n", in_use); | |
1da177e4 LT |
193 | kfree(pool->events); |
194 | dma_free_coherent(hostdata->dev, | |
195 | pool->size * sizeof(*pool->iu_storage), | |
196 | pool->iu_storage, pool->iu_token); | |
197 | } | |
198 | ||
199 | /** | |
200 | * valid_event_struct: - Determines if event is valid. | |
201 | * @pool: event_pool that contains the event | |
202 | * @evt: srp_event_struct to be checked for validity | |
203 | * | |
204 | * Returns zero if event is invalid, one otherwise. | |
205 | */ | |
206 | static int valid_event_struct(struct event_pool *pool, | |
207 | struct srp_event_struct *evt) | |
208 | { | |
209 | int index = evt - pool->events; | |
210 | if (index < 0 || index >= pool->size) /* outside of bounds */ | |
211 | return 0; | |
212 | if (evt != pool->events + index) /* unaligned */ | |
213 | return 0; | |
214 | return 1; | |
215 | } | |
216 | ||
217 | /** | |
218 | * ibmvscsi_free-event_struct: - Changes status of event to "free" | |
219 | * @pool: event_pool that contains the event | |
220 | * @evt: srp_event_struct to be modified | |
221 | * | |
222 | */ | |
223 | static void free_event_struct(struct event_pool *pool, | |
224 | struct srp_event_struct *evt) | |
225 | { | |
226 | if (!valid_event_struct(pool, evt)) { | |
6c0a60ec BK |
227 | dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p " |
228 | "(not in pool %p)\n", evt, pool->events); | |
1da177e4 LT |
229 | return; |
230 | } | |
231 | if (atomic_inc_return(&evt->free) != 1) { | |
6c0a60ec BK |
232 | dev_err(evt->hostdata->dev, "Freeing event_struct %p " |
233 | "which is not in use!\n", evt); | |
1da177e4 LT |
234 | return; |
235 | } | |
236 | } | |
237 | ||
238 | /** | |
239 | * get_evt_struct: - Gets the next free event in pool | |
240 | * @pool: event_pool that contains the events to be searched | |
241 | * | |
242 | * Returns the next event in "free" state, and NULL if none are free. | |
243 | * Note that no synchronization is done here, we assume the host_lock | |
244 | * will syncrhonze things. | |
245 | */ | |
246 | static struct srp_event_struct *get_event_struct(struct event_pool *pool) | |
247 | { | |
248 | int i; | |
249 | int poolsize = pool->size; | |
250 | int offset = pool->next; | |
251 | ||
252 | for (i = 0; i < poolsize; i++) { | |
253 | offset = (offset + 1) % poolsize; | |
254 | if (!atomic_dec_if_positive(&pool->events[offset].free)) { | |
255 | pool->next = offset; | |
256 | return &pool->events[offset]; | |
257 | } | |
258 | } | |
259 | ||
260 | printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n"); | |
261 | return NULL; | |
262 | } | |
263 | ||
264 | /** | |
265 | * init_event_struct: Initialize fields in an event struct that are always | |
266 | * required. | |
267 | * @evt: The event | |
268 | * @done: Routine to call when the event is responded to | |
269 | * @format: SRP or MAD format | |
270 | * @timeout: timeout value set in the CRQ | |
271 | */ | |
272 | static void init_event_struct(struct srp_event_struct *evt_struct, | |
273 | void (*done) (struct srp_event_struct *), | |
274 | u8 format, | |
275 | int timeout) | |
276 | { | |
277 | evt_struct->cmnd = NULL; | |
278 | evt_struct->cmnd_done = NULL; | |
279 | evt_struct->sync_srp = NULL; | |
280 | evt_struct->crq.format = format; | |
281 | evt_struct->crq.timeout = timeout; | |
282 | evt_struct->done = done; | |
283 | } | |
284 | ||
285 | /* ------------------------------------------------------------ | |
286 | * Routines for receiving SCSI responses from the hosting partition | |
287 | */ | |
288 | ||
289 | /** | |
290 | * set_srp_direction: Set the fields in the srp related to data | |
291 | * direction and number of buffers based on the direction in | |
292 | * the scsi_cmnd and the number of buffers | |
293 | */ | |
294 | static void set_srp_direction(struct scsi_cmnd *cmd, | |
295 | struct srp_cmd *srp_cmd, | |
296 | int numbuf) | |
297 | { | |
ef265673 FT |
298 | u8 fmt; |
299 | ||
1da177e4 LT |
300 | if (numbuf == 0) |
301 | return; | |
302 | ||
ef265673 FT |
303 | if (numbuf == 1) |
304 | fmt = SRP_DATA_DESC_DIRECT; | |
305 | else { | |
306 | fmt = SRP_DATA_DESC_INDIRECT; | |
307 | numbuf = min(numbuf, MAX_INDIRECT_BUFS); | |
308 | ||
1da177e4 | 309 | if (cmd->sc_data_direction == DMA_TO_DEVICE) |
ef265673 FT |
310 | srp_cmd->data_out_desc_cnt = numbuf; |
311 | else | |
312 | srp_cmd->data_in_desc_cnt = numbuf; | |
1da177e4 | 313 | } |
ef265673 FT |
314 | |
315 | if (cmd->sc_data_direction == DMA_TO_DEVICE) | |
316 | srp_cmd->buf_fmt = fmt << 4; | |
317 | else | |
318 | srp_cmd->buf_fmt = fmt; | |
1da177e4 LT |
319 | } |
320 | ||
321 | /** | |
322 | * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format | |
323 | * @cmd: srp_cmd whose additional_data member will be unmapped | |
324 | * @dev: device for which the memory is mapped | |
325 | * | |
326 | */ | |
4dddbc26 JB |
327 | static void unmap_cmd_data(struct srp_cmd *cmd, |
328 | struct srp_event_struct *evt_struct, | |
329 | struct device *dev) | |
1da177e4 | 330 | { |
ef265673 FT |
331 | u8 out_fmt, in_fmt; |
332 | ||
333 | out_fmt = cmd->buf_fmt >> 4; | |
334 | in_fmt = cmd->buf_fmt & ((1U << 4) - 1); | |
335 | ||
336 | if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC) | |
1da177e4 | 337 | return; |
4dddbc26 | 338 | |
a71fa1fc FT |
339 | if (evt_struct->cmnd) |
340 | scsi_dma_unmap(evt_struct->cmnd); | |
1da177e4 LT |
341 | } |
342 | ||
9413d7b8 | 343 | static int map_sg_list(struct scsi_cmnd *cmd, int nseg, |
ef265673 | 344 | struct srp_direct_buf *md) |
4dddbc26 JB |
345 | { |
346 | int i; | |
9413d7b8 | 347 | struct scatterlist *sg; |
4dddbc26 JB |
348 | u64 total_length = 0; |
349 | ||
9413d7b8 | 350 | scsi_for_each_sg(cmd, sg, nseg, i) { |
ef265673 | 351 | struct srp_direct_buf *descr = md + i; |
9413d7b8 FT |
352 | descr->va = sg_dma_address(sg); |
353 | descr->len = sg_dma_len(sg); | |
ef265673 | 354 | descr->key = 0; |
9413d7b8 | 355 | total_length += sg_dma_len(sg); |
4dddbc26 JB |
356 | } |
357 | return total_length; | |
358 | } | |
359 | ||
1da177e4 LT |
360 | /** |
361 | * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields | |
362 | * @cmd: Scsi_Cmnd with the scatterlist | |
363 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
364 | * @dev: device for which to map dma memory | |
365 | * | |
366 | * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd. | |
367 | * Returns 1 on success. | |
368 | */ | |
369 | static int map_sg_data(struct scsi_cmnd *cmd, | |
4dddbc26 | 370 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
371 | struct srp_cmd *srp_cmd, struct device *dev) |
372 | { | |
373 | ||
4dddbc26 | 374 | int sg_mapped; |
1da177e4 | 375 | u64 total_length = 0; |
ef265673 FT |
376 | struct srp_direct_buf *data = |
377 | (struct srp_direct_buf *) srp_cmd->add_data; | |
378 | struct srp_indirect_buf *indirect = | |
379 | (struct srp_indirect_buf *) data; | |
1da177e4 | 380 | |
9413d7b8 FT |
381 | sg_mapped = scsi_dma_map(cmd); |
382 | if (!sg_mapped) | |
383 | return 1; | |
384 | else if (sg_mapped < 0) | |
1da177e4 LT |
385 | return 0; |
386 | ||
387 | set_srp_direction(cmd, srp_cmd, sg_mapped); | |
388 | ||
389 | /* special case; we can use a single direct descriptor */ | |
390 | if (sg_mapped == 1) { | |
9413d7b8 | 391 | map_sg_list(cmd, sg_mapped, data); |
1da177e4 LT |
392 | return 1; |
393 | } | |
394 | ||
ef265673 FT |
395 | indirect->table_desc.va = 0; |
396 | indirect->table_desc.len = sg_mapped * sizeof(struct srp_direct_buf); | |
397 | indirect->table_desc.key = 0; | |
4dddbc26 JB |
398 | |
399 | if (sg_mapped <= MAX_INDIRECT_BUFS) { | |
9413d7b8 | 400 | total_length = map_sg_list(cmd, sg_mapped, |
ef265673 FT |
401 | &indirect->desc_list[0]); |
402 | indirect->len = total_length; | |
4dddbc26 | 403 | return 1; |
1da177e4 | 404 | } |
1da177e4 | 405 | |
4dddbc26 JB |
406 | /* get indirect table */ |
407 | if (!evt_struct->ext_list) { | |
ef265673 | 408 | evt_struct->ext_list = (struct srp_direct_buf *) |
9413d7b8 | 409 | dma_alloc_coherent(dev, |
ef265673 FT |
410 | SG_ALL * sizeof(struct srp_direct_buf), |
411 | &evt_struct->ext_list_token, 0); | |
4dddbc26 | 412 | if (!evt_struct->ext_list) { |
7912a0ac RJ |
413 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
414 | sdev_printk(KERN_ERR, cmd->device, | |
415 | "Can't allocate memory " | |
416 | "for indirect table\n"); | |
e637d553 | 417 | scsi_dma_unmap(cmd); |
4dddbc26 | 418 | return 0; |
4dddbc26 JB |
419 | } |
420 | } | |
421 | ||
9413d7b8 | 422 | total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list); |
4dddbc26 | 423 | |
ef265673 FT |
424 | indirect->len = total_length; |
425 | indirect->table_desc.va = evt_struct->ext_list_token; | |
426 | indirect->table_desc.len = sg_mapped * sizeof(indirect->desc_list[0]); | |
427 | memcpy(indirect->desc_list, evt_struct->ext_list, | |
428 | MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf)); | |
4dddbc26 | 429 | return 1; |
1da177e4 LT |
430 | } |
431 | ||
1da177e4 LT |
432 | /** |
433 | * map_data_for_srp_cmd: - Calls functions to map data for srp cmds | |
434 | * @cmd: struct scsi_cmnd with the memory to be mapped | |
435 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
436 | * @dev: dma device for which to map dma memory | |
437 | * | |
438 | * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds | |
439 | * Returns 1 on success. | |
440 | */ | |
441 | static int map_data_for_srp_cmd(struct scsi_cmnd *cmd, | |
4dddbc26 | 442 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
443 | struct srp_cmd *srp_cmd, struct device *dev) |
444 | { | |
445 | switch (cmd->sc_data_direction) { | |
446 | case DMA_FROM_DEVICE: | |
447 | case DMA_TO_DEVICE: | |
448 | break; | |
449 | case DMA_NONE: | |
450 | return 1; | |
451 | case DMA_BIDIRECTIONAL: | |
6c0a60ec BK |
452 | sdev_printk(KERN_ERR, cmd->device, |
453 | "Can't map DMA_BIDIRECTIONAL to read/write\n"); | |
1da177e4 LT |
454 | return 0; |
455 | default: | |
6c0a60ec BK |
456 | sdev_printk(KERN_ERR, cmd->device, |
457 | "Unknown data direction 0x%02x; can't map!\n", | |
458 | cmd->sc_data_direction); | |
1da177e4 LT |
459 | return 0; |
460 | } | |
461 | ||
9413d7b8 | 462 | return map_sg_data(cmd, evt_struct, srp_cmd, dev); |
1da177e4 LT |
463 | } |
464 | ||
3d0e91f7 BK |
465 | /** |
466 | * purge_requests: Our virtual adapter just shut down. purge any sent requests | |
467 | * @hostdata: the adapter | |
468 | */ | |
469 | static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code) | |
470 | { | |
1117ef8a | 471 | struct srp_event_struct *evt; |
3d0e91f7 BK |
472 | unsigned long flags; |
473 | ||
474 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1117ef8a BK |
475 | while (!list_empty(&hostdata->sent)) { |
476 | evt = list_first_entry(&hostdata->sent, struct srp_event_struct, list); | |
477 | list_del(&evt->list); | |
478 | del_timer(&evt->timer); | |
479 | ||
480 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
481 | if (evt->cmnd) { | |
482 | evt->cmnd->result = (error_code << 16); | |
483 | unmap_cmd_data(&evt->iu.srp.cmd, evt, | |
484 | evt->hostdata->dev); | |
485 | if (evt->cmnd_done) | |
486 | evt->cmnd_done(evt->cmnd); | |
487 | } else if (evt->done) | |
488 | evt->done(evt); | |
489 | free_event_struct(&evt->hostdata->pool, evt); | |
490 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
3d0e91f7 BK |
491 | } |
492 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
493 | } | |
494 | ||
495 | /** | |
496 | * ibmvscsi_reset_host - Reset the connection to the server | |
497 | * @hostdata: struct ibmvscsi_host_data to reset | |
498 | */ | |
499 | static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata) | |
500 | { | |
501 | scsi_block_requests(hostdata->host); | |
502 | atomic_set(&hostdata->request_limit, 0); | |
503 | ||
504 | purge_requests(hostdata, DID_ERROR); | |
0f33ece5 BK |
505 | hostdata->reset_crq = 1; |
506 | wake_up(&hostdata->work_wait_q); | |
3d0e91f7 BK |
507 | } |
508 | ||
509 | /** | |
510 | * ibmvscsi_timeout - Internal command timeout handler | |
511 | * @evt_struct: struct srp_event_struct that timed out | |
512 | * | |
513 | * Called when an internally generated command times out | |
514 | */ | |
515 | static void ibmvscsi_timeout(struct srp_event_struct *evt_struct) | |
516 | { | |
517 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
518 | ||
519 | dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n", | |
520 | evt_struct->iu.srp.cmd.opcode); | |
521 | ||
522 | ibmvscsi_reset_host(hostdata); | |
523 | } | |
524 | ||
525 | ||
1da177e4 LT |
526 | /* ------------------------------------------------------------ |
527 | * Routines for sending and receiving SRPs | |
528 | */ | |
529 | /** | |
530 | * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq() | |
531 | * @evt_struct: evt_struct to be sent | |
532 | * @hostdata: ibmvscsi_host_data of host | |
3d0e91f7 | 533 | * @timeout: timeout in seconds - 0 means do not time command |
1da177e4 LT |
534 | * |
535 | * Returns the value returned from ibmvscsi_send_crq(). (Zero for success) | |
536 | * Note that this routine assumes that host_lock is held for synchronization | |
537 | */ | |
538 | static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct, | |
3d0e91f7 BK |
539 | struct ibmvscsi_host_data *hostdata, |
540 | unsigned long timeout) | |
1da177e4 | 541 | { |
1da177e4 | 542 | u64 *crq_as_u64 = (u64 *) &evt_struct->crq; |
3c887e8a | 543 | int request_status = 0; |
1da177e4 | 544 | int rc; |
f3a9c4d7 | 545 | int srp_req = 0; |
1da177e4 | 546 | |
a897ff2a RJ |
547 | /* If we have exhausted our request limit, just fail this request, |
548 | * unless it is for a reset or abort. | |
1da177e4 LT |
549 | * Note that there are rare cases involving driver generated requests |
550 | * (such as task management requests) that the mid layer may think we | |
551 | * can handle more requests (can_queue) when we actually can't | |
552 | */ | |
cefbda2d | 553 | if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) { |
f3a9c4d7 | 554 | srp_req = 1; |
cefbda2d DB |
555 | request_status = |
556 | atomic_dec_if_positive(&hostdata->request_limit); | |
557 | /* If request limit was -1 when we started, it is now even | |
558 | * less than that | |
559 | */ | |
560 | if (request_status < -1) | |
561 | goto send_error; | |
a897ff2a | 562 | /* Otherwise, we may have run out of requests. */ |
3c887e8a RJ |
563 | /* If request limit was 0 when we started the adapter is in the |
564 | * process of performing a login with the server adapter, or | |
565 | * we may have run out of requests. | |
566 | */ | |
567 | else if (request_status == -1 && | |
568 | evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ) | |
569 | goto send_busy; | |
a897ff2a RJ |
570 | /* Abort and reset calls should make it through. |
571 | * Nothing except abort and reset should use the last two | |
572 | * slots unless we had two or less to begin with. | |
573 | */ | |
574 | else if (request_status < 2 && | |
575 | evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) { | |
576 | /* In the case that we have less than two requests | |
577 | * available, check the server limit as a combination | |
578 | * of the request limit and the number of requests | |
579 | * in-flight (the size of the send list). If the | |
580 | * server limit is greater than 2, return busy so | |
581 | * that the last two are reserved for reset and abort. | |
582 | */ | |
583 | int server_limit = request_status; | |
584 | struct srp_event_struct *tmp_evt; | |
585 | ||
586 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
587 | server_limit++; | |
588 | } | |
589 | ||
590 | if (server_limit > 2) | |
591 | goto send_busy; | |
592 | } | |
cefbda2d | 593 | } |
1da177e4 LT |
594 | |
595 | /* Copy the IU into the transfer area */ | |
596 | *evt_struct->xfer_iu = evt_struct->iu; | |
ef265673 | 597 | evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct; |
1da177e4 LT |
598 | |
599 | /* Add this to the sent list. We need to do this | |
600 | * before we actually send | |
601 | * in case it comes back REALLY fast | |
602 | */ | |
603 | list_add_tail(&evt_struct->list, &hostdata->sent); | |
604 | ||
3d0e91f7 BK |
605 | init_timer(&evt_struct->timer); |
606 | if (timeout) { | |
607 | evt_struct->timer.data = (unsigned long) evt_struct; | |
608 | evt_struct->timer.expires = jiffies + (timeout * HZ); | |
609 | evt_struct->timer.function = (void (*)(unsigned long))ibmvscsi_timeout; | |
610 | add_timer(&evt_struct->timer); | |
611 | } | |
612 | ||
1da177e4 | 613 | if ((rc = |
d3849d51 | 614 | ibmvscsi_ops->send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) { |
1da177e4 | 615 | list_del(&evt_struct->list); |
3d0e91f7 | 616 | del_timer(&evt_struct->timer); |
1da177e4 | 617 | |
860784c8 RJ |
618 | /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY. |
619 | * Firmware will send a CRQ with a transport event (0xFF) to | |
620 | * tell this client what has happened to the transport. This | |
621 | * will be handled in ibmvscsi_handle_crq() | |
622 | */ | |
623 | if (rc == H_CLOSED) { | |
624 | dev_warn(hostdata->dev, "send warning. " | |
625 | "Receive queue closed, will retry.\n"); | |
626 | goto send_busy; | |
627 | } | |
6c0a60ec | 628 | dev_err(hostdata->dev, "send error %d\n", rc); |
f3a9c4d7 BK |
629 | if (srp_req) |
630 | atomic_inc(&hostdata->request_limit); | |
1da177e4 LT |
631 | goto send_error; |
632 | } | |
633 | ||
634 | return 0; | |
635 | ||
cefbda2d | 636 | send_busy: |
4dddbc26 | 637 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); |
1da177e4 | 638 | |
1da177e4 | 639 | free_event_struct(&hostdata->pool, evt_struct); |
f3a9c4d7 | 640 | if (srp_req && request_status != -1) |
3c887e8a | 641 | atomic_inc(&hostdata->request_limit); |
a897ff2a | 642 | return SCSI_MLQUEUE_HOST_BUSY; |
cefbda2d DB |
643 | |
644 | send_error: | |
645 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); | |
646 | ||
647 | if (evt_struct->cmnd != NULL) { | |
648 | evt_struct->cmnd->result = DID_ERROR << 16; | |
649 | evt_struct->cmnd_done(evt_struct->cmnd); | |
650 | } else if (evt_struct->done) | |
651 | evt_struct->done(evt_struct); | |
652 | ||
653 | free_event_struct(&hostdata->pool, evt_struct); | |
654 | return 0; | |
1da177e4 LT |
655 | } |
656 | ||
657 | /** | |
658 | * handle_cmd_rsp: - Handle responses from commands | |
659 | * @evt_struct: srp_event_struct to be handled | |
660 | * | |
661 | * Used as a callback by when sending scsi cmds. | |
662 | * Gets called by ibmvscsi_handle_crq() | |
663 | */ | |
664 | static void handle_cmd_rsp(struct srp_event_struct *evt_struct) | |
665 | { | |
666 | struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp; | |
667 | struct scsi_cmnd *cmnd = evt_struct->cmnd; | |
668 | ||
ef265673 | 669 | if (unlikely(rsp->opcode != SRP_RSP)) { |
1da177e4 | 670 | if (printk_ratelimit()) |
6c0a60ec BK |
671 | dev_warn(evt_struct->hostdata->dev, |
672 | "bad SRP RSP type %d\n", rsp->opcode); | |
1da177e4 LT |
673 | } |
674 | ||
675 | if (cmnd) { | |
c3a3b55a | 676 | cmnd->result |= rsp->status; |
1da177e4 LT |
677 | if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION) |
678 | memcpy(cmnd->sense_buffer, | |
ef265673 FT |
679 | rsp->data, |
680 | rsp->sense_data_len); | |
1da177e4 | 681 | unmap_cmd_data(&evt_struct->iu.srp.cmd, |
4dddbc26 | 682 | evt_struct, |
1da177e4 LT |
683 | evt_struct->hostdata->dev); |
684 | ||
ef265673 | 685 | if (rsp->flags & SRP_RSP_FLAG_DOOVER) |
9413d7b8 | 686 | scsi_set_resid(cmnd, rsp->data_out_res_cnt); |
ef265673 | 687 | else if (rsp->flags & SRP_RSP_FLAG_DIOVER) |
9413d7b8 | 688 | scsi_set_resid(cmnd, rsp->data_in_res_cnt); |
1da177e4 LT |
689 | } |
690 | ||
691 | if (evt_struct->cmnd_done) | |
692 | evt_struct->cmnd_done(cmnd); | |
693 | } | |
694 | ||
695 | /** | |
696 | * lun_from_dev: - Returns the lun of the scsi device | |
697 | * @dev: struct scsi_device | |
698 | * | |
699 | */ | |
700 | static inline u16 lun_from_dev(struct scsi_device *dev) | |
701 | { | |
702 | return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun; | |
703 | } | |
704 | ||
705 | /** | |
706 | * ibmvscsi_queue: - The queuecommand function of the scsi template | |
707 | * @cmd: struct scsi_cmnd to be executed | |
708 | * @done: Callback function to be called when cmd is completed | |
709 | */ | |
f281233d | 710 | static int ibmvscsi_queuecommand_lck(struct scsi_cmnd *cmnd, |
1da177e4 LT |
711 | void (*done) (struct scsi_cmnd *)) |
712 | { | |
713 | struct srp_cmd *srp_cmd; | |
714 | struct srp_event_struct *evt_struct; | |
ef265673 | 715 | struct srp_indirect_buf *indirect; |
7603e02e | 716 | struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host); |
1da177e4 | 717 | u16 lun = lun_from_dev(cmnd->device); |
ef265673 | 718 | u8 out_fmt, in_fmt; |
1da177e4 | 719 | |
c3a3b55a | 720 | cmnd->result = (DID_OK << 16); |
1da177e4 LT |
721 | evt_struct = get_event_struct(&hostdata->pool); |
722 | if (!evt_struct) | |
723 | return SCSI_MLQUEUE_HOST_BUSY; | |
724 | ||
1da177e4 LT |
725 | /* Set up the actual SRP IU */ |
726 | srp_cmd = &evt_struct->iu.srp.cmd; | |
ef265673 FT |
727 | memset(srp_cmd, 0x00, SRP_MAX_IU_LEN); |
728 | srp_cmd->opcode = SRP_CMD; | |
64a87b24 | 729 | memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb)); |
1da177e4 LT |
730 | srp_cmd->lun = ((u64) lun) << 48; |
731 | ||
4dddbc26 | 732 | if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) { |
7912a0ac RJ |
733 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
734 | sdev_printk(KERN_ERR, cmnd->device, | |
735 | "couldn't convert cmd to srp_cmd\n"); | |
1da177e4 LT |
736 | free_event_struct(&hostdata->pool, evt_struct); |
737 | return SCSI_MLQUEUE_HOST_BUSY; | |
738 | } | |
739 | ||
4dddbc26 JB |
740 | init_event_struct(evt_struct, |
741 | handle_cmd_rsp, | |
742 | VIOSRP_SRP_FORMAT, | |
242f9dcb | 743 | cmnd->request->timeout/HZ); |
4dddbc26 JB |
744 | |
745 | evt_struct->cmnd = cmnd; | |
746 | evt_struct->cmnd_done = done; | |
747 | ||
1da177e4 | 748 | /* Fix up dma address of the buffer itself */ |
ef265673 FT |
749 | indirect = (struct srp_indirect_buf *) srp_cmd->add_data; |
750 | out_fmt = srp_cmd->buf_fmt >> 4; | |
751 | in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1); | |
752 | if ((in_fmt == SRP_DATA_DESC_INDIRECT || | |
753 | out_fmt == SRP_DATA_DESC_INDIRECT) && | |
754 | indirect->table_desc.va == 0) { | |
755 | indirect->table_desc.va = evt_struct->crq.IU_data_ptr + | |
756 | offsetof(struct srp_cmd, add_data) + | |
757 | offsetof(struct srp_indirect_buf, desc_list); | |
1da177e4 LT |
758 | } |
759 | ||
3d0e91f7 | 760 | return ibmvscsi_send_srp_event(evt_struct, hostdata, 0); |
1da177e4 LT |
761 | } |
762 | ||
f281233d JG |
763 | static DEF_SCSI_QCMD(ibmvscsi_queuecommand) |
764 | ||
1da177e4 LT |
765 | /* ------------------------------------------------------------ |
766 | * Routines for driver initialization | |
767 | */ | |
3507e13f | 768 | |
126c5cc3 BK |
769 | /** |
770 | * map_persist_bufs: - Pre-map persistent data for adapter logins | |
771 | * @hostdata: ibmvscsi_host_data of host | |
772 | * | |
773 | * Map the capabilities and adapter info DMA buffers to avoid runtime failures. | |
774 | * Return 1 on error, 0 on success. | |
775 | */ | |
776 | static int map_persist_bufs(struct ibmvscsi_host_data *hostdata) | |
777 | { | |
778 | ||
779 | hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps, | |
780 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
781 | ||
782 | if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) { | |
783 | dev_err(hostdata->dev, "Unable to map capabilities buffer!\n"); | |
784 | return 1; | |
785 | } | |
786 | ||
787 | hostdata->adapter_info_addr = dma_map_single(hostdata->dev, | |
788 | &hostdata->madapter_info, | |
789 | sizeof(hostdata->madapter_info), | |
790 | DMA_BIDIRECTIONAL); | |
791 | if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) { | |
792 | dev_err(hostdata->dev, "Unable to map adapter info buffer!\n"); | |
793 | dma_unmap_single(hostdata->dev, hostdata->caps_addr, | |
794 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
795 | return 1; | |
796 | } | |
797 | ||
798 | return 0; | |
799 | } | |
800 | ||
801 | /** | |
802 | * unmap_persist_bufs: - Unmap persistent data needed for adapter logins | |
803 | * @hostdata: ibmvscsi_host_data of host | |
804 | * | |
805 | * Unmap the capabilities and adapter info DMA buffers | |
806 | */ | |
807 | static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata) | |
808 | { | |
809 | dma_unmap_single(hostdata->dev, hostdata->caps_addr, | |
810 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
811 | ||
812 | dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr, | |
813 | sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL); | |
814 | } | |
815 | ||
3507e13f BK |
816 | /** |
817 | * login_rsp: - Handle response to SRP login request | |
818 | * @evt_struct: srp_event_struct with the response | |
819 | * | |
820 | * Used as a "done" callback by when sending srp_login. Gets called | |
821 | * by ibmvscsi_handle_crq() | |
822 | */ | |
823 | static void login_rsp(struct srp_event_struct *evt_struct) | |
824 | { | |
825 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
826 | switch (evt_struct->xfer_iu->srp.login_rsp.opcode) { | |
827 | case SRP_LOGIN_RSP: /* it worked! */ | |
828 | break; | |
829 | case SRP_LOGIN_REJ: /* refused! */ | |
830 | dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n", | |
831 | evt_struct->xfer_iu->srp.login_rej.reason); | |
832 | /* Login failed. */ | |
833 | atomic_set(&hostdata->request_limit, -1); | |
834 | return; | |
835 | default: | |
836 | dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n", | |
837 | evt_struct->xfer_iu->srp.login_rsp.opcode); | |
838 | /* Login failed. */ | |
839 | atomic_set(&hostdata->request_limit, -1); | |
840 | return; | |
841 | } | |
842 | ||
843 | dev_info(hostdata->dev, "SRP_LOGIN succeeded\n"); | |
126c5cc3 | 844 | hostdata->client_migrated = 0; |
3507e13f BK |
845 | |
846 | /* Now we know what the real request-limit is. | |
847 | * This value is set rather than added to request_limit because | |
848 | * request_limit could have been set to -1 by this client. | |
849 | */ | |
850 | atomic_set(&hostdata->request_limit, | |
851 | evt_struct->xfer_iu->srp.login_rsp.req_lim_delta); | |
852 | ||
853 | /* If we had any pending I/Os, kick them */ | |
854 | scsi_unblock_requests(hostdata->host); | |
855 | } | |
856 | ||
857 | /** | |
858 | * send_srp_login: - Sends the srp login | |
859 | * @hostdata: ibmvscsi_host_data of host | |
860 | * | |
861 | * Returns zero if successful. | |
862 | */ | |
863 | static int send_srp_login(struct ibmvscsi_host_data *hostdata) | |
864 | { | |
865 | int rc; | |
866 | unsigned long flags; | |
867 | struct srp_login_req *login; | |
868 | struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool); | |
869 | ||
870 | BUG_ON(!evt_struct); | |
871 | init_event_struct(evt_struct, login_rsp, | |
872 | VIOSRP_SRP_FORMAT, login_timeout); | |
873 | ||
874 | login = &evt_struct->iu.srp.login_req; | |
875 | memset(login, 0, sizeof(*login)); | |
876 | login->opcode = SRP_LOGIN_REQ; | |
877 | login->req_it_iu_len = sizeof(union srp_iu); | |
878 | login->req_buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT; | |
879 | ||
880 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
881 | /* Start out with a request limit of 0, since this is negotiated in | |
882 | * the login request we are just sending and login requests always | |
883 | * get sent by the driver regardless of request_limit. | |
884 | */ | |
885 | atomic_set(&hostdata->request_limit, 0); | |
886 | ||
887 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2); | |
888 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
889 | dev_info(hostdata->dev, "sent SRP login\n"); | |
890 | return rc; | |
891 | }; | |
892 | ||
126c5cc3 BK |
893 | /** |
894 | * capabilities_rsp: - Handle response to MAD adapter capabilities request | |
895 | * @evt_struct: srp_event_struct with the response | |
896 | * | |
897 | * Used as a "done" callback by when sending adapter_info. | |
898 | */ | |
899 | static void capabilities_rsp(struct srp_event_struct *evt_struct) | |
900 | { | |
901 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
902 | ||
903 | if (evt_struct->xfer_iu->mad.capabilities.common.status) { | |
904 | dev_err(hostdata->dev, "error 0x%X getting capabilities info\n", | |
905 | evt_struct->xfer_iu->mad.capabilities.common.status); | |
906 | } else { | |
907 | if (hostdata->caps.migration.common.server_support != SERVER_SUPPORTS_CAP) | |
908 | dev_info(hostdata->dev, "Partition migration not supported\n"); | |
909 | ||
910 | if (client_reserve) { | |
911 | if (hostdata->caps.reserve.common.server_support == | |
912 | SERVER_SUPPORTS_CAP) | |
913 | dev_info(hostdata->dev, "Client reserve enabled\n"); | |
914 | else | |
915 | dev_info(hostdata->dev, "Client reserve not supported\n"); | |
916 | } | |
917 | } | |
918 | ||
919 | send_srp_login(hostdata); | |
920 | } | |
921 | ||
922 | /** | |
923 | * send_mad_capabilities: - Sends the mad capabilities request | |
924 | * and stores the result so it can be retrieved with | |
925 | * @hostdata: ibmvscsi_host_data of host | |
926 | */ | |
927 | static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata) | |
928 | { | |
929 | struct viosrp_capabilities *req; | |
930 | struct srp_event_struct *evt_struct; | |
931 | unsigned long flags; | |
61c7a080 | 932 | struct device_node *of_node = hostdata->dev->of_node; |
126c5cc3 BK |
933 | const char *location; |
934 | ||
935 | evt_struct = get_event_struct(&hostdata->pool); | |
936 | BUG_ON(!evt_struct); | |
937 | ||
938 | init_event_struct(evt_struct, capabilities_rsp, | |
939 | VIOSRP_MAD_FORMAT, info_timeout); | |
940 | ||
941 | req = &evt_struct->iu.mad.capabilities; | |
942 | memset(req, 0, sizeof(*req)); | |
943 | ||
944 | hostdata->caps.flags = CAP_LIST_SUPPORTED; | |
945 | if (hostdata->client_migrated) | |
946 | hostdata->caps.flags |= CLIENT_MIGRATED; | |
947 | ||
948 | strncpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev), | |
949 | sizeof(hostdata->caps.name)); | |
950 | hostdata->caps.name[sizeof(hostdata->caps.name) - 1] = '\0'; | |
951 | ||
952 | location = of_get_property(of_node, "ibm,loc-code", NULL); | |
953 | location = location ? location : dev_name(hostdata->dev); | |
954 | strncpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc)); | |
955 | hostdata->caps.loc[sizeof(hostdata->caps.loc) - 1] = '\0'; | |
956 | ||
957 | req->common.type = VIOSRP_CAPABILITIES_TYPE; | |
958 | req->buffer = hostdata->caps_addr; | |
959 | ||
960 | hostdata->caps.migration.common.cap_type = MIGRATION_CAPABILITIES; | |
961 | hostdata->caps.migration.common.length = sizeof(hostdata->caps.migration); | |
962 | hostdata->caps.migration.common.server_support = SERVER_SUPPORTS_CAP; | |
963 | hostdata->caps.migration.ecl = 1; | |
964 | ||
965 | if (client_reserve) { | |
966 | hostdata->caps.reserve.common.cap_type = RESERVATION_CAPABILITIES; | |
967 | hostdata->caps.reserve.common.length = sizeof(hostdata->caps.reserve); | |
968 | hostdata->caps.reserve.common.server_support = SERVER_SUPPORTS_CAP; | |
969 | hostdata->caps.reserve.type = CLIENT_RESERVE_SCSI_2; | |
970 | req->common.length = sizeof(hostdata->caps); | |
971 | } else | |
972 | req->common.length = sizeof(hostdata->caps) - sizeof(hostdata->caps.reserve); | |
973 | ||
974 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
975 | if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) | |
976 | dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n"); | |
977 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
978 | }; | |
979 | ||
c1988e31 RJ |
980 | /** |
981 | * fast_fail_rsp: - Handle response to MAD enable fast fail | |
982 | * @evt_struct: srp_event_struct with the response | |
983 | * | |
984 | * Used as a "done" callback by when sending enable fast fail. Gets called | |
985 | * by ibmvscsi_handle_crq() | |
986 | */ | |
987 | static void fast_fail_rsp(struct srp_event_struct *evt_struct) | |
988 | { | |
989 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
990 | u8 status = evt_struct->xfer_iu->mad.fast_fail.common.status; | |
991 | ||
992 | if (status == VIOSRP_MAD_NOT_SUPPORTED) | |
993 | dev_err(hostdata->dev, "fast_fail not supported in server\n"); | |
994 | else if (status == VIOSRP_MAD_FAILED) | |
995 | dev_err(hostdata->dev, "fast_fail request failed\n"); | |
996 | else if (status != VIOSRP_MAD_SUCCESS) | |
997 | dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status); | |
998 | ||
126c5cc3 | 999 | send_mad_capabilities(hostdata); |
c1988e31 RJ |
1000 | } |
1001 | ||
1002 | /** | |
1003 | * init_host - Start host initialization | |
1004 | * @hostdata: ibmvscsi_host_data of host | |
1005 | * | |
1006 | * Returns zero if successful. | |
1007 | */ | |
1008 | static int enable_fast_fail(struct ibmvscsi_host_data *hostdata) | |
1009 | { | |
1010 | int rc; | |
1011 | unsigned long flags; | |
1012 | struct viosrp_fast_fail *fast_fail_mad; | |
1013 | struct srp_event_struct *evt_struct; | |
1014 | ||
126c5cc3 BK |
1015 | if (!fast_fail) { |
1016 | send_mad_capabilities(hostdata); | |
1017 | return 0; | |
1018 | } | |
c1988e31 RJ |
1019 | |
1020 | evt_struct = get_event_struct(&hostdata->pool); | |
1021 | BUG_ON(!evt_struct); | |
1022 | ||
1023 | init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout); | |
1024 | ||
1025 | fast_fail_mad = &evt_struct->iu.mad.fast_fail; | |
1026 | memset(fast_fail_mad, 0, sizeof(*fast_fail_mad)); | |
1027 | fast_fail_mad->common.type = VIOSRP_ENABLE_FAST_FAIL; | |
1028 | fast_fail_mad->common.length = sizeof(*fast_fail_mad); | |
1029 | ||
1030 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1031 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2); | |
1032 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1033 | return rc; | |
1034 | } | |
1035 | ||
1da177e4 LT |
1036 | /** |
1037 | * adapter_info_rsp: - Handle response to MAD adapter info request | |
1038 | * @evt_struct: srp_event_struct with the response | |
1039 | * | |
1040 | * Used as a "done" callback by when sending adapter_info. Gets called | |
1041 | * by ibmvscsi_handle_crq() | |
1042 | */ | |
1043 | static void adapter_info_rsp(struct srp_event_struct *evt_struct) | |
1044 | { | |
1045 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
1da177e4 LT |
1046 | |
1047 | if (evt_struct->xfer_iu->mad.adapter_info.common.status) { | |
6c0a60ec BK |
1048 | dev_err(hostdata->dev, "error %d getting adapter info\n", |
1049 | evt_struct->xfer_iu->mad.adapter_info.common.status); | |
1da177e4 | 1050 | } else { |
6c0a60ec BK |
1051 | dev_info(hostdata->dev, "host srp version: %s, " |
1052 | "host partition %s (%d), OS %d, max io %u\n", | |
1053 | hostdata->madapter_info.srp_version, | |
1054 | hostdata->madapter_info.partition_name, | |
1055 | hostdata->madapter_info.partition_number, | |
1056 | hostdata->madapter_info.os_type, | |
1057 | hostdata->madapter_info.port_max_txu[0]); | |
1da177e4 LT |
1058 | |
1059 | if (hostdata->madapter_info.port_max_txu[0]) | |
1060 | hostdata->host->max_sectors = | |
1061 | hostdata->madapter_info.port_max_txu[0] >> 9; | |
154fb614 DB |
1062 | |
1063 | if (hostdata->madapter_info.os_type == 3 && | |
1064 | strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) { | |
6c0a60ec BK |
1065 | dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n", |
1066 | hostdata->madapter_info.srp_version); | |
1067 | dev_err(hostdata->dev, "limiting scatterlists to %d\n", | |
1068 | MAX_INDIRECT_BUFS); | |
154fb614 DB |
1069 | hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS; |
1070 | } | |
e08afeb7 BK |
1071 | |
1072 | if (hostdata->madapter_info.os_type == 3) { | |
1073 | enable_fast_fail(hostdata); | |
1074 | return; | |
1075 | } | |
1da177e4 | 1076 | } |
3507e13f | 1077 | |
e08afeb7 | 1078 | send_srp_login(hostdata); |
1da177e4 LT |
1079 | } |
1080 | ||
1081 | /** | |
1082 | * send_mad_adapter_info: - Sends the mad adapter info request | |
1083 | * and stores the result so it can be retrieved with | |
1084 | * sysfs. We COULD consider causing a failure if the | |
1085 | * returned SRP version doesn't match ours. | |
1086 | * @hostdata: ibmvscsi_host_data of host | |
1087 | * | |
1088 | * Returns zero if successful. | |
1089 | */ | |
1090 | static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata) | |
1091 | { | |
1092 | struct viosrp_adapter_info *req; | |
1093 | struct srp_event_struct *evt_struct; | |
06f923cb | 1094 | unsigned long flags; |
e5dbfa66 | 1095 | |
1da177e4 | 1096 | evt_struct = get_event_struct(&hostdata->pool); |
3507e13f | 1097 | BUG_ON(!evt_struct); |
1da177e4 LT |
1098 | |
1099 | init_event_struct(evt_struct, | |
1100 | adapter_info_rsp, | |
1101 | VIOSRP_MAD_FORMAT, | |
e1a5ce5b | 1102 | info_timeout); |
1da177e4 LT |
1103 | |
1104 | req = &evt_struct->iu.mad.adapter_info; | |
1105 | memset(req, 0x00, sizeof(*req)); | |
1106 | ||
1107 | req->common.type = VIOSRP_ADAPTER_INFO_TYPE; | |
1108 | req->common.length = sizeof(hostdata->madapter_info); | |
126c5cc3 | 1109 | req->buffer = hostdata->adapter_info_addr; |
1da177e4 | 1110 | |
06f923cb | 1111 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
126c5cc3 | 1112 | if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) |
6c0a60ec | 1113 | dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n"); |
06f923cb | 1114 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1115 | }; |
1116 | ||
1117 | /** | |
3507e13f | 1118 | * init_adapter: Start virtual adapter initialization sequence |
1da177e4 | 1119 | * |
3507e13f BK |
1120 | */ |
1121 | static void init_adapter(struct ibmvscsi_host_data *hostdata) | |
1da177e4 | 1122 | { |
1da177e4 | 1123 | send_mad_adapter_info(hostdata); |
1da177e4 LT |
1124 | } |
1125 | ||
1da177e4 LT |
1126 | /** |
1127 | * sync_completion: Signal that a synchronous command has completed | |
1128 | * Note that after returning from this call, the evt_struct is freed. | |
1129 | * the caller waiting on this completion shouldn't touch the evt_struct | |
1130 | * again. | |
1131 | */ | |
1132 | static void sync_completion(struct srp_event_struct *evt_struct) | |
1133 | { | |
1134 | /* copy the response back */ | |
1135 | if (evt_struct->sync_srp) | |
1136 | *evt_struct->sync_srp = *evt_struct->xfer_iu; | |
1137 | ||
1138 | complete(&evt_struct->comp); | |
1139 | } | |
1140 | ||
1141 | /** | |
1142 | * ibmvscsi_abort: Abort a command...from scsi host template | |
1143 | * send this over to the server and wait synchronously for the response | |
1144 | */ | |
1145 | static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd) | |
1146 | { | |
7603e02e | 1147 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 LT |
1148 | struct srp_tsk_mgmt *tsk_mgmt; |
1149 | struct srp_event_struct *evt; | |
1150 | struct srp_event_struct *tmp_evt, *found_evt; | |
1151 | union viosrp_iu srp_rsp; | |
1152 | int rsp_rc; | |
be042f24 | 1153 | unsigned long flags; |
1da177e4 | 1154 | u16 lun = lun_from_dev(cmd->device); |
860784c8 | 1155 | unsigned long wait_switch = 0; |
1da177e4 LT |
1156 | |
1157 | /* First, find this command in our sent list so we can figure | |
1158 | * out the correct tag | |
1159 | */ | |
be042f24 | 1160 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
860784c8 RJ |
1161 | wait_switch = jiffies + (init_timeout * HZ); |
1162 | do { | |
1163 | found_evt = NULL; | |
1164 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
1165 | if (tmp_evt->cmnd == cmd) { | |
1166 | found_evt = tmp_evt; | |
1167 | break; | |
1168 | } | |
1da177e4 | 1169 | } |
1da177e4 | 1170 | |
860784c8 RJ |
1171 | if (!found_evt) { |
1172 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1173 | return SUCCESS; | |
1174 | } | |
1da177e4 | 1175 | |
860784c8 RJ |
1176 | evt = get_event_struct(&hostdata->pool); |
1177 | if (evt == NULL) { | |
1178 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1179 | sdev_printk(KERN_ERR, cmd->device, | |
1180 | "failed to allocate abort event\n"); | |
1181 | return FAILED; | |
1182 | } | |
1da177e4 | 1183 | |
860784c8 RJ |
1184 | init_event_struct(evt, |
1185 | sync_completion, | |
1186 | VIOSRP_SRP_FORMAT, | |
e1a5ce5b | 1187 | abort_timeout); |
1da177e4 | 1188 | |
860784c8 | 1189 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
1da177e4 | 1190 | |
860784c8 RJ |
1191 | /* Set up an abort SRP command */ |
1192 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
1193 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
1194 | tsk_mgmt->lun = ((u64) lun) << 48; | |
1195 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK; | |
1196 | tsk_mgmt->task_tag = (u64) found_evt; | |
1197 | ||
1198 | evt->sync_srp = &srp_rsp; | |
1199 | ||
1200 | init_completion(&evt->comp); | |
e1a5ce5b | 1201 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2); |
860784c8 RJ |
1202 | |
1203 | if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) | |
1204 | break; | |
1205 | ||
1206 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1207 | msleep(10); | |
1208 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1209 | } while (time_before(jiffies, wait_switch)); | |
1210 | ||
be042f24 | 1211 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
860784c8 | 1212 | |
be042f24 | 1213 | if (rsp_rc != 0) { |
6c0a60ec BK |
1214 | sdev_printk(KERN_ERR, cmd->device, |
1215 | "failed to send abort() event. rc=%d\n", rsp_rc); | |
1da177e4 LT |
1216 | return FAILED; |
1217 | } | |
1218 | ||
860784c8 | 1219 | sdev_printk(KERN_INFO, cmd->device, |
fe333321 | 1220 | "aborting command. lun 0x%llx, tag 0x%llx\n", |
860784c8 RJ |
1221 | (((u64) lun) << 48), (u64) found_evt); |
1222 | ||
1da177e4 | 1223 | wait_for_completion(&evt->comp); |
1da177e4 LT |
1224 | |
1225 | /* make sure we got a good response */ | |
ef265673 | 1226 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 | 1227 | if (printk_ratelimit()) |
6c0a60ec BK |
1228 | sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n", |
1229 | srp_rsp.srp.rsp.opcode); | |
1da177e4 LT |
1230 | return FAILED; |
1231 | } | |
1232 | ||
ef265673 FT |
1233 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1234 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1235 | else |
1236 | rsp_rc = srp_rsp.srp.rsp.status; | |
1237 | ||
1238 | if (rsp_rc) { | |
1239 | if (printk_ratelimit()) | |
6c0a60ec | 1240 | sdev_printk(KERN_WARNING, cmd->device, |
fe333321 | 1241 | "abort code %d for task tag 0x%llx\n", |
6c0a60ec | 1242 | rsp_rc, tsk_mgmt->task_tag); |
1da177e4 LT |
1243 | return FAILED; |
1244 | } | |
1245 | ||
1246 | /* Because we dropped the spinlock above, it's possible | |
1247 | * The event is no longer in our list. Make sure it didn't | |
1248 | * complete while we were aborting | |
1249 | */ | |
be042f24 | 1250 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1251 | found_evt = NULL; |
1252 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
1253 | if (tmp_evt->cmnd == cmd) { | |
1254 | found_evt = tmp_evt; | |
1255 | break; | |
1256 | } | |
1257 | } | |
1258 | ||
1259 | if (found_evt == NULL) { | |
be042f24 | 1260 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
fe333321 | 1261 | sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n", |
6c0a60ec | 1262 | tsk_mgmt->task_tag); |
1da177e4 LT |
1263 | return SUCCESS; |
1264 | } | |
1265 | ||
fe333321 | 1266 | sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n", |
6c0a60ec | 1267 | tsk_mgmt->task_tag); |
1da177e4 LT |
1268 | |
1269 | cmd->result = (DID_ABORT << 16); | |
1270 | list_del(&found_evt->list); | |
4dddbc26 JB |
1271 | unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt, |
1272 | found_evt->hostdata->dev); | |
1da177e4 | 1273 | free_event_struct(&found_evt->hostdata->pool, found_evt); |
be042f24 | 1274 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1275 | atomic_inc(&hostdata->request_limit); |
1276 | return SUCCESS; | |
1277 | } | |
1278 | ||
1279 | /** | |
1280 | * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host | |
1281 | * template send this over to the server and wait synchronously for the | |
1282 | * response | |
1283 | */ | |
1284 | static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd) | |
1285 | { | |
7603e02e | 1286 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 LT |
1287 | struct srp_tsk_mgmt *tsk_mgmt; |
1288 | struct srp_event_struct *evt; | |
1289 | struct srp_event_struct *tmp_evt, *pos; | |
1290 | union viosrp_iu srp_rsp; | |
1291 | int rsp_rc; | |
be042f24 | 1292 | unsigned long flags; |
1da177e4 | 1293 | u16 lun = lun_from_dev(cmd->device); |
860784c8 | 1294 | unsigned long wait_switch = 0; |
1da177e4 | 1295 | |
be042f24 | 1296 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
860784c8 RJ |
1297 | wait_switch = jiffies + (init_timeout * HZ); |
1298 | do { | |
1299 | evt = get_event_struct(&hostdata->pool); | |
1300 | if (evt == NULL) { | |
1301 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1302 | sdev_printk(KERN_ERR, cmd->device, | |
1303 | "failed to allocate reset event\n"); | |
1304 | return FAILED; | |
1305 | } | |
1da177e4 | 1306 | |
860784c8 RJ |
1307 | init_event_struct(evt, |
1308 | sync_completion, | |
1309 | VIOSRP_SRP_FORMAT, | |
e1a5ce5b | 1310 | reset_timeout); |
1da177e4 | 1311 | |
860784c8 | 1312 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
1da177e4 | 1313 | |
860784c8 RJ |
1314 | /* Set up a lun reset SRP command */ |
1315 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
1316 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
1317 | tsk_mgmt->lun = ((u64) lun) << 48; | |
1318 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET; | |
1da177e4 | 1319 | |
860784c8 RJ |
1320 | evt->sync_srp = &srp_rsp; |
1321 | ||
1322 | init_completion(&evt->comp); | |
e1a5ce5b | 1323 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2); |
860784c8 RJ |
1324 | |
1325 | if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) | |
1326 | break; | |
1327 | ||
1328 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1329 | msleep(10); | |
1330 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1331 | } while (time_before(jiffies, wait_switch)); | |
1da177e4 | 1332 | |
be042f24 | 1333 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
860784c8 | 1334 | |
be042f24 | 1335 | if (rsp_rc != 0) { |
6c0a60ec BK |
1336 | sdev_printk(KERN_ERR, cmd->device, |
1337 | "failed to send reset event. rc=%d\n", rsp_rc); | |
1da177e4 LT |
1338 | return FAILED; |
1339 | } | |
1340 | ||
fe333321 | 1341 | sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n", |
860784c8 RJ |
1342 | (((u64) lun) << 48)); |
1343 | ||
1da177e4 | 1344 | wait_for_completion(&evt->comp); |
1da177e4 LT |
1345 | |
1346 | /* make sure we got a good response */ | |
ef265673 | 1347 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 | 1348 | if (printk_ratelimit()) |
6c0a60ec BK |
1349 | sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n", |
1350 | srp_rsp.srp.rsp.opcode); | |
1da177e4 LT |
1351 | return FAILED; |
1352 | } | |
1353 | ||
ef265673 FT |
1354 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1355 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1356 | else |
1357 | rsp_rc = srp_rsp.srp.rsp.status; | |
1358 | ||
1359 | if (rsp_rc) { | |
1360 | if (printk_ratelimit()) | |
6c0a60ec | 1361 | sdev_printk(KERN_WARNING, cmd->device, |
fe333321 | 1362 | "reset code %d for task tag 0x%llx\n", |
6c0a60ec | 1363 | rsp_rc, tsk_mgmt->task_tag); |
1da177e4 LT |
1364 | return FAILED; |
1365 | } | |
1366 | ||
1367 | /* We need to find all commands for this LUN that have not yet been | |
1368 | * responded to, and fail them with DID_RESET | |
1369 | */ | |
be042f24 | 1370 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1371 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { |
1372 | if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) { | |
1373 | if (tmp_evt->cmnd) | |
1374 | tmp_evt->cmnd->result = (DID_RESET << 16); | |
1375 | list_del(&tmp_evt->list); | |
4dddbc26 JB |
1376 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt, |
1377 | tmp_evt->hostdata->dev); | |
1da177e4 LT |
1378 | free_event_struct(&tmp_evt->hostdata->pool, |
1379 | tmp_evt); | |
1380 | atomic_inc(&hostdata->request_limit); | |
1381 | if (tmp_evt->cmnd_done) | |
1382 | tmp_evt->cmnd_done(tmp_evt->cmnd); | |
1383 | else if (tmp_evt->done) | |
1384 | tmp_evt->done(tmp_evt); | |
1385 | } | |
1386 | } | |
be042f24 | 1387 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1388 | return SUCCESS; |
1389 | } | |
1390 | ||
1391 | /** | |
3d0e91f7 BK |
1392 | * ibmvscsi_eh_host_reset_handler - Reset the connection to the server |
1393 | * @cmd: struct scsi_cmnd having problems | |
1394 | */ | |
1395 | static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd) | |
1da177e4 | 1396 | { |
3d0e91f7 | 1397 | unsigned long wait_switch = 0; |
7603e02e | 1398 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 | 1399 | |
3d0e91f7 BK |
1400 | dev_err(hostdata->dev, "Resetting connection due to error recovery\n"); |
1401 | ||
1402 | ibmvscsi_reset_host(hostdata); | |
1403 | ||
1404 | for (wait_switch = jiffies + (init_timeout * HZ); | |
1405 | time_before(jiffies, wait_switch) && | |
1406 | atomic_read(&hostdata->request_limit) < 2;) { | |
1407 | ||
1408 | msleep(10); | |
1da177e4 | 1409 | } |
3d0e91f7 BK |
1410 | |
1411 | if (atomic_read(&hostdata->request_limit) <= 0) | |
1412 | return FAILED; | |
1413 | ||
1414 | return SUCCESS; | |
1da177e4 LT |
1415 | } |
1416 | ||
1417 | /** | |
1418 | * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ | |
1419 | * @crq: Command/Response queue | |
1420 | * @hostdata: ibmvscsi_host_data of host | |
1421 | * | |
1422 | */ | |
1423 | void ibmvscsi_handle_crq(struct viosrp_crq *crq, | |
1424 | struct ibmvscsi_host_data *hostdata) | |
1425 | { | |
6c0a60ec | 1426 | long rc; |
1da177e4 LT |
1427 | unsigned long flags; |
1428 | struct srp_event_struct *evt_struct = | |
1429 | (struct srp_event_struct *)crq->IU_data_ptr; | |
1430 | switch (crq->valid) { | |
1431 | case 0xC0: /* initialization */ | |
1432 | switch (crq->format) { | |
1433 | case 0x01: /* Initialization message */ | |
6c0a60ec | 1434 | dev_info(hostdata->dev, "partner initialized\n"); |
1da177e4 | 1435 | /* Send back a response */ |
d3849d51 DW |
1436 | if ((rc = ibmvscsi_ops->send_crq(hostdata, |
1437 | 0xC002000000000000LL, 0)) == 0) { | |
1da177e4 | 1438 | /* Now login */ |
3507e13f | 1439 | init_adapter(hostdata); |
1da177e4 | 1440 | } else { |
6c0a60ec | 1441 | dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc); |
1da177e4 LT |
1442 | } |
1443 | ||
1444 | break; | |
1445 | case 0x02: /* Initialization response */ | |
6c0a60ec | 1446 | dev_info(hostdata->dev, "partner initialization complete\n"); |
1da177e4 LT |
1447 | |
1448 | /* Now login */ | |
3507e13f | 1449 | init_adapter(hostdata); |
1da177e4 LT |
1450 | break; |
1451 | default: | |
6c0a60ec | 1452 | dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format); |
1da177e4 LT |
1453 | } |
1454 | return; | |
2b541f8f DB |
1455 | case 0xFF: /* Hypervisor telling us the connection is closed */ |
1456 | scsi_block_requests(hostdata->host); | |
cefbda2d | 1457 | atomic_set(&hostdata->request_limit, 0); |
2b541f8f DB |
1458 | if (crq->format == 0x06) { |
1459 | /* We need to re-setup the interpartition connection */ | |
6c0a60ec | 1460 | dev_info(hostdata->dev, "Re-enabling adapter!\n"); |
126c5cc3 | 1461 | hostdata->client_migrated = 1; |
0f33ece5 | 1462 | hostdata->reenable_crq = 1; |
2b541f8f | 1463 | purge_requests(hostdata, DID_REQUEUE); |
0f33ece5 | 1464 | wake_up(&hostdata->work_wait_q); |
2b541f8f | 1465 | } else { |
6c0a60ec BK |
1466 | dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n", |
1467 | crq->format); | |
0f33ece5 | 1468 | ibmvscsi_reset_host(hostdata); |
2b541f8f | 1469 | } |
1da177e4 LT |
1470 | return; |
1471 | case 0x80: /* real payload */ | |
1472 | break; | |
1473 | default: | |
6c0a60ec BK |
1474 | dev_err(hostdata->dev, "got an invalid message type 0x%02x\n", |
1475 | crq->valid); | |
1da177e4 LT |
1476 | return; |
1477 | } | |
1478 | ||
1479 | /* The only kind of payload CRQs we should get are responses to | |
1480 | * things we send. Make sure this response is to something we | |
1481 | * actually sent | |
1482 | */ | |
1483 | if (!valid_event_struct(&hostdata->pool, evt_struct)) { | |
6c0a60ec | 1484 | dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n", |
1da177e4 LT |
1485 | (void *)crq->IU_data_ptr); |
1486 | return; | |
1487 | } | |
1488 | ||
1489 | if (atomic_read(&evt_struct->free)) { | |
6c0a60ec BK |
1490 | dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n", |
1491 | (void *)crq->IU_data_ptr); | |
1da177e4 LT |
1492 | return; |
1493 | } | |
1494 | ||
1495 | if (crq->format == VIOSRP_SRP_FORMAT) | |
ef265673 | 1496 | atomic_add(evt_struct->xfer_iu->srp.rsp.req_lim_delta, |
1da177e4 LT |
1497 | &hostdata->request_limit); |
1498 | ||
3d0e91f7 BK |
1499 | del_timer(&evt_struct->timer); |
1500 | ||
ca61668b | 1501 | if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd) |
c3a3b55a | 1502 | evt_struct->cmnd->result = DID_ERROR << 16; |
1da177e4 LT |
1503 | if (evt_struct->done) |
1504 | evt_struct->done(evt_struct); | |
1505 | else | |
6c0a60ec | 1506 | dev_err(hostdata->dev, "returned done() is NULL; not running it!\n"); |
1da177e4 LT |
1507 | |
1508 | /* | |
1509 | * Lock the host_lock before messing with these structures, since we | |
1510 | * are running in a task context | |
1511 | */ | |
1512 | spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags); | |
1513 | list_del(&evt_struct->list); | |
1514 | free_event_struct(&evt_struct->hostdata->pool, evt_struct); | |
1515 | spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags); | |
1516 | } | |
1517 | ||
1518 | /** | |
1519 | * ibmvscsi_get_host_config: Send the command to the server to get host | |
1520 | * configuration data. The data is opaque to us. | |
1521 | */ | |
1522 | static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata, | |
1523 | unsigned char *buffer, int length) | |
1524 | { | |
1525 | struct viosrp_host_config *host_config; | |
1526 | struct srp_event_struct *evt_struct; | |
06f923cb | 1527 | unsigned long flags; |
e5dbfa66 | 1528 | dma_addr_t addr; |
1da177e4 LT |
1529 | int rc; |
1530 | ||
1531 | evt_struct = get_event_struct(&hostdata->pool); | |
1532 | if (!evt_struct) { | |
6c0a60ec | 1533 | dev_err(hostdata->dev, "couldn't allocate event for HOST_CONFIG!\n"); |
1da177e4 LT |
1534 | return -1; |
1535 | } | |
1536 | ||
1537 | init_event_struct(evt_struct, | |
1538 | sync_completion, | |
1539 | VIOSRP_MAD_FORMAT, | |
e1a5ce5b | 1540 | info_timeout); |
1da177e4 LT |
1541 | |
1542 | host_config = &evt_struct->iu.mad.host_config; | |
1543 | ||
1544 | /* Set up a lun reset SRP command */ | |
1545 | memset(host_config, 0x00, sizeof(*host_config)); | |
1546 | host_config->common.type = VIOSRP_HOST_CONFIG_TYPE; | |
1547 | host_config->common.length = length; | |
e5dbfa66 FT |
1548 | host_config->buffer = addr = dma_map_single(hostdata->dev, buffer, |
1549 | length, | |
1550 | DMA_BIDIRECTIONAL); | |
1da177e4 | 1551 | |
8d8bb39b | 1552 | if (dma_mapping_error(hostdata->dev, host_config->buffer)) { |
7912a0ac RJ |
1553 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
1554 | dev_err(hostdata->dev, | |
1555 | "dma_mapping error getting host config\n"); | |
1da177e4 LT |
1556 | free_event_struct(&hostdata->pool, evt_struct); |
1557 | return -1; | |
1558 | } | |
1559 | ||
1560 | init_completion(&evt_struct->comp); | |
06f923cb | 1561 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
e1a5ce5b | 1562 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2); |
06f923cb | 1563 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
e5dbfa66 | 1564 | if (rc == 0) |
1da177e4 | 1565 | wait_for_completion(&evt_struct->comp); |
e5dbfa66 | 1566 | dma_unmap_single(hostdata->dev, addr, length, DMA_BIDIRECTIONAL); |
1da177e4 LT |
1567 | |
1568 | return rc; | |
1569 | } | |
1570 | ||
0979c84b RJ |
1571 | /** |
1572 | * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk. | |
1573 | * @sdev: struct scsi_device device to configure | |
1574 | * | |
1575 | * Enable allow_restart for a device if it is a disk. Adjust the | |
1576 | * queue_depth here also as is required by the documentation for | |
1577 | * struct scsi_host_template. | |
1578 | */ | |
1579 | static int ibmvscsi_slave_configure(struct scsi_device *sdev) | |
1580 | { | |
1581 | struct Scsi_Host *shost = sdev->host; | |
1582 | unsigned long lock_flags = 0; | |
1583 | ||
1584 | spin_lock_irqsave(shost->host_lock, lock_flags); | |
d1a357fc | 1585 | if (sdev->type == TYPE_DISK) { |
0979c84b | 1586 | sdev->allow_restart = 1; |
e1a5ce5b | 1587 | blk_queue_rq_timeout(sdev->request_queue, 120 * HZ); |
d1a357fc | 1588 | } |
0979c84b RJ |
1589 | scsi_adjust_queue_depth(sdev, 0, shost->cmd_per_lun); |
1590 | spin_unlock_irqrestore(shost->host_lock, lock_flags); | |
1591 | return 0; | |
1592 | } | |
1593 | ||
742d25b8 BK |
1594 | /** |
1595 | * ibmvscsi_change_queue_depth - Change the device's queue depth | |
1596 | * @sdev: scsi device struct | |
1597 | * @qdepth: depth to set | |
e881a172 | 1598 | * @reason: calling context |
742d25b8 BK |
1599 | * |
1600 | * Return value: | |
1601 | * actual depth set | |
1602 | **/ | |
e881a172 MC |
1603 | static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth, |
1604 | int reason) | |
742d25b8 | 1605 | { |
e881a172 MC |
1606 | if (reason != SCSI_QDEPTH_DEFAULT) |
1607 | return -EOPNOTSUPP; | |
1608 | ||
742d25b8 BK |
1609 | if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN) |
1610 | qdepth = IBMVSCSI_MAX_CMDS_PER_LUN; | |
1611 | ||
1612 | scsi_adjust_queue_depth(sdev, 0, qdepth); | |
1613 | return sdev->queue_depth; | |
1614 | } | |
1615 | ||
1da177e4 LT |
1616 | /* ------------------------------------------------------------ |
1617 | * sysfs attributes | |
1618 | */ | |
126c5cc3 BK |
1619 | static ssize_t show_host_vhost_loc(struct device *dev, |
1620 | struct device_attribute *attr, char *buf) | |
1621 | { | |
1622 | struct Scsi_Host *shost = class_to_shost(dev); | |
1623 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); | |
1624 | int len; | |
1625 | ||
1626 | len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n", | |
1627 | hostdata->caps.loc); | |
1628 | return len; | |
1629 | } | |
1630 | ||
1631 | static struct device_attribute ibmvscsi_host_vhost_loc = { | |
1632 | .attr = { | |
1633 | .name = "vhost_loc", | |
1634 | .mode = S_IRUGO, | |
1635 | }, | |
1636 | .show = show_host_vhost_loc, | |
1637 | }; | |
1638 | ||
1639 | static ssize_t show_host_vhost_name(struct device *dev, | |
1640 | struct device_attribute *attr, char *buf) | |
1641 | { | |
1642 | struct Scsi_Host *shost = class_to_shost(dev); | |
1643 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); | |
1644 | int len; | |
1645 | ||
1646 | len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n", | |
1647 | hostdata->caps.name); | |
1648 | return len; | |
1649 | } | |
1650 | ||
1651 | static struct device_attribute ibmvscsi_host_vhost_name = { | |
1652 | .attr = { | |
1653 | .name = "vhost_name", | |
1654 | .mode = S_IRUGO, | |
1655 | }, | |
1656 | .show = show_host_vhost_name, | |
1657 | }; | |
1658 | ||
ee959b00 TJ |
1659 | static ssize_t show_host_srp_version(struct device *dev, |
1660 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1661 | { |
ee959b00 | 1662 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1663 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1664 | int len; |
1665 | ||
1666 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1667 | hostdata->madapter_info.srp_version); | |
1668 | return len; | |
1669 | } | |
1670 | ||
ee959b00 | 1671 | static struct device_attribute ibmvscsi_host_srp_version = { |
1da177e4 LT |
1672 | .attr = { |
1673 | .name = "srp_version", | |
1674 | .mode = S_IRUGO, | |
1675 | }, | |
1676 | .show = show_host_srp_version, | |
1677 | }; | |
1678 | ||
ee959b00 TJ |
1679 | static ssize_t show_host_partition_name(struct device *dev, |
1680 | struct device_attribute *attr, | |
1da177e4 LT |
1681 | char *buf) |
1682 | { | |
ee959b00 | 1683 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1684 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1685 | int len; |
1686 | ||
1687 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1688 | hostdata->madapter_info.partition_name); | |
1689 | return len; | |
1690 | } | |
1691 | ||
ee959b00 | 1692 | static struct device_attribute ibmvscsi_host_partition_name = { |
1da177e4 LT |
1693 | .attr = { |
1694 | .name = "partition_name", | |
1695 | .mode = S_IRUGO, | |
1696 | }, | |
1697 | .show = show_host_partition_name, | |
1698 | }; | |
1699 | ||
ee959b00 TJ |
1700 | static ssize_t show_host_partition_number(struct device *dev, |
1701 | struct device_attribute *attr, | |
1da177e4 LT |
1702 | char *buf) |
1703 | { | |
ee959b00 | 1704 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1705 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1706 | int len; |
1707 | ||
1708 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
1709 | hostdata->madapter_info.partition_number); | |
1710 | return len; | |
1711 | } | |
1712 | ||
ee959b00 | 1713 | static struct device_attribute ibmvscsi_host_partition_number = { |
1da177e4 LT |
1714 | .attr = { |
1715 | .name = "partition_number", | |
1716 | .mode = S_IRUGO, | |
1717 | }, | |
1718 | .show = show_host_partition_number, | |
1719 | }; | |
1720 | ||
ee959b00 TJ |
1721 | static ssize_t show_host_mad_version(struct device *dev, |
1722 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1723 | { |
ee959b00 | 1724 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1725 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1726 | int len; |
1727 | ||
1728 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
1729 | hostdata->madapter_info.mad_version); | |
1730 | return len; | |
1731 | } | |
1732 | ||
ee959b00 | 1733 | static struct device_attribute ibmvscsi_host_mad_version = { |
1da177e4 LT |
1734 | .attr = { |
1735 | .name = "mad_version", | |
1736 | .mode = S_IRUGO, | |
1737 | }, | |
1738 | .show = show_host_mad_version, | |
1739 | }; | |
1740 | ||
ee959b00 TJ |
1741 | static ssize_t show_host_os_type(struct device *dev, |
1742 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1743 | { |
ee959b00 | 1744 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1745 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1746 | int len; |
1747 | ||
1748 | len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type); | |
1749 | return len; | |
1750 | } | |
1751 | ||
ee959b00 | 1752 | static struct device_attribute ibmvscsi_host_os_type = { |
1da177e4 LT |
1753 | .attr = { |
1754 | .name = "os_type", | |
1755 | .mode = S_IRUGO, | |
1756 | }, | |
1757 | .show = show_host_os_type, | |
1758 | }; | |
1759 | ||
ee959b00 TJ |
1760 | static ssize_t show_host_config(struct device *dev, |
1761 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1762 | { |
ee959b00 | 1763 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1764 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1765 | |
1766 | /* returns null-terminated host config data */ | |
1767 | if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0) | |
1768 | return strlen(buf); | |
1769 | else | |
1770 | return 0; | |
1771 | } | |
1772 | ||
ee959b00 | 1773 | static struct device_attribute ibmvscsi_host_config = { |
1da177e4 LT |
1774 | .attr = { |
1775 | .name = "config", | |
1776 | .mode = S_IRUGO, | |
1777 | }, | |
1778 | .show = show_host_config, | |
1779 | }; | |
1780 | ||
ee959b00 | 1781 | static struct device_attribute *ibmvscsi_attrs[] = { |
126c5cc3 BK |
1782 | &ibmvscsi_host_vhost_loc, |
1783 | &ibmvscsi_host_vhost_name, | |
1da177e4 LT |
1784 | &ibmvscsi_host_srp_version, |
1785 | &ibmvscsi_host_partition_name, | |
1786 | &ibmvscsi_host_partition_number, | |
1787 | &ibmvscsi_host_mad_version, | |
1788 | &ibmvscsi_host_os_type, | |
1789 | &ibmvscsi_host_config, | |
1790 | NULL | |
1791 | }; | |
1792 | ||
1793 | /* ------------------------------------------------------------ | |
1794 | * SCSI driver registration | |
1795 | */ | |
1796 | static struct scsi_host_template driver_template = { | |
1797 | .module = THIS_MODULE, | |
1798 | .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION, | |
1799 | .proc_name = "ibmvscsi", | |
1800 | .queuecommand = ibmvscsi_queuecommand, | |
1801 | .eh_abort_handler = ibmvscsi_eh_abort_handler, | |
1802 | .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler, | |
3d0e91f7 | 1803 | .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler, |
0979c84b | 1804 | .slave_configure = ibmvscsi_slave_configure, |
742d25b8 | 1805 | .change_queue_depth = ibmvscsi_change_queue_depth, |
7912a0ac | 1806 | .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT, |
a897ff2a | 1807 | .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT, |
1da177e4 | 1808 | .this_id = -1, |
4dddbc26 | 1809 | .sg_tablesize = SG_ALL, |
1da177e4 LT |
1810 | .use_clustering = ENABLE_CLUSTERING, |
1811 | .shost_attrs = ibmvscsi_attrs, | |
1812 | }; | |
1813 | ||
7912a0ac RJ |
1814 | /** |
1815 | * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver | |
1816 | * | |
1817 | * @vdev: struct vio_dev for the device whose desired IO mem is to be returned | |
1818 | * | |
1819 | * Return value: | |
1820 | * Number of bytes of IO data the driver will need to perform well. | |
1821 | */ | |
1822 | static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev) | |
1823 | { | |
1824 | /* iu_storage data allocated in initialize_event_pool */ | |
4f10aae0 | 1825 | unsigned long desired_io = max_events * sizeof(union viosrp_iu); |
7912a0ac RJ |
1826 | |
1827 | /* add io space for sg data */ | |
004dd5e8 | 1828 | desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 * |
7912a0ac RJ |
1829 | IBMVSCSI_CMDS_PER_LUN_DEFAULT); |
1830 | ||
1831 | return desired_io; | |
1832 | } | |
1833 | ||
0f33ece5 BK |
1834 | static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata) |
1835 | { | |
1836 | int rc; | |
1837 | char *action = "reset"; | |
1838 | ||
1839 | if (hostdata->reset_crq) { | |
1840 | smp_rmb(); | |
1841 | hostdata->reset_crq = 0; | |
1842 | ||
1843 | rc = ibmvscsi_ops->reset_crq_queue(&hostdata->queue, hostdata); | |
1844 | if (!rc) | |
1845 | rc = ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0); | |
201aed67 | 1846 | vio_enable_interrupts(to_vio_dev(hostdata->dev)); |
0f33ece5 BK |
1847 | } else if (hostdata->reenable_crq) { |
1848 | smp_rmb(); | |
1849 | action = "enable"; | |
1850 | rc = ibmvscsi_ops->reenable_crq_queue(&hostdata->queue, hostdata); | |
1851 | hostdata->reenable_crq = 0; | |
1852 | if (!rc) | |
1853 | rc = ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0); | |
1854 | } else | |
1855 | return; | |
1856 | ||
1857 | if (rc) { | |
1858 | atomic_set(&hostdata->request_limit, -1); | |
1859 | dev_err(hostdata->dev, "error after %s\n", action); | |
1860 | } | |
1861 | ||
1862 | scsi_unblock_requests(hostdata->host); | |
1863 | } | |
1864 | ||
1865 | static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata) | |
1866 | { | |
1867 | if (kthread_should_stop()) | |
1868 | return 1; | |
1869 | else if (hostdata->reset_crq) { | |
1870 | smp_rmb(); | |
1871 | return 1; | |
1872 | } else if (hostdata->reenable_crq) { | |
1873 | smp_rmb(); | |
1874 | return 1; | |
1875 | } | |
1876 | ||
1877 | return 0; | |
1878 | } | |
1879 | ||
1880 | static int ibmvscsi_work(void *data) | |
1881 | { | |
1882 | struct ibmvscsi_host_data *hostdata = data; | |
1883 | int rc; | |
1884 | ||
1885 | set_user_nice(current, -20); | |
1886 | ||
1887 | while (1) { | |
1888 | rc = wait_event_interruptible(hostdata->work_wait_q, | |
1889 | ibmvscsi_work_to_do(hostdata)); | |
1890 | ||
1891 | BUG_ON(rc); | |
1892 | ||
1893 | if (kthread_should_stop()) | |
1894 | break; | |
1895 | ||
1896 | ibmvscsi_do_work(hostdata); | |
1897 | } | |
1898 | ||
1899 | return 0; | |
1900 | } | |
1901 | ||
1da177e4 LT |
1902 | /** |
1903 | * Called by bus code for each adapter | |
1904 | */ | |
1905 | static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id) | |
1906 | { | |
1907 | struct ibmvscsi_host_data *hostdata; | |
1908 | struct Scsi_Host *host; | |
1909 | struct device *dev = &vdev->dev; | |
4d680419 FT |
1910 | struct srp_rport_identifiers ids; |
1911 | struct srp_rport *rport; | |
1da177e4 | 1912 | unsigned long wait_switch = 0; |
cefbda2d | 1913 | int rc; |
1da177e4 | 1914 | |
559fde70 | 1915 | dev_set_drvdata(&vdev->dev, NULL); |
1da177e4 LT |
1916 | |
1917 | host = scsi_host_alloc(&driver_template, sizeof(*hostdata)); | |
1918 | if (!host) { | |
6c0a60ec | 1919 | dev_err(&vdev->dev, "couldn't allocate host data\n"); |
1da177e4 LT |
1920 | goto scsi_host_alloc_failed; |
1921 | } | |
1922 | ||
4d680419 | 1923 | host->transportt = ibmvscsi_transport_template; |
7603e02e | 1924 | hostdata = shost_priv(host); |
1da177e4 LT |
1925 | memset(hostdata, 0x00, sizeof(*hostdata)); |
1926 | INIT_LIST_HEAD(&hostdata->sent); | |
0f33ece5 | 1927 | init_waitqueue_head(&hostdata->work_wait_q); |
1da177e4 LT |
1928 | hostdata->host = host; |
1929 | hostdata->dev = dev; | |
1930 | atomic_set(&hostdata->request_limit, -1); | |
7912a0ac | 1931 | hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT; |
1da177e4 | 1932 | |
126c5cc3 BK |
1933 | if (map_persist_bufs(hostdata)) { |
1934 | dev_err(&vdev->dev, "couldn't map persistent buffers\n"); | |
1935 | goto persist_bufs_failed; | |
1936 | } | |
1937 | ||
0f33ece5 BK |
1938 | hostdata->work_thread = kthread_run(ibmvscsi_work, hostdata, "%s_%d", |
1939 | "ibmvscsi", host->host_no); | |
1940 | ||
1941 | if (IS_ERR(hostdata->work_thread)) { | |
1942 | dev_err(&vdev->dev, "couldn't initialize kthread. rc=%ld\n", | |
1943 | PTR_ERR(hostdata->work_thread)); | |
1944 | goto init_crq_failed; | |
1945 | } | |
1946 | ||
4f10aae0 | 1947 | rc = ibmvscsi_ops->init_crq_queue(&hostdata->queue, hostdata, max_events); |
cefbda2d | 1948 | if (rc != 0 && rc != H_RESOURCE) { |
6c0a60ec | 1949 | dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc); |
0f33ece5 | 1950 | goto kill_kthread; |
1da177e4 | 1951 | } |
4f10aae0 | 1952 | if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) { |
6c0a60ec | 1953 | dev_err(&vdev->dev, "couldn't initialize event pool\n"); |
1da177e4 LT |
1954 | goto init_pool_failed; |
1955 | } | |
1956 | ||
1957 | host->max_lun = 8; | |
1958 | host->max_id = max_id; | |
1959 | host->max_channel = max_channel; | |
fbc56f08 | 1960 | host->max_cmd_len = 16; |
1da177e4 LT |
1961 | |
1962 | if (scsi_add_host(hostdata->host, hostdata->dev)) | |
1963 | goto add_host_failed; | |
1964 | ||
4d680419 FT |
1965 | /* we don't have a proper target_port_id so let's use the fake one */ |
1966 | memcpy(ids.port_id, hostdata->madapter_info.partition_name, | |
1967 | sizeof(ids.port_id)); | |
aebd5e47 | 1968 | ids.roles = SRP_RPORT_ROLE_TARGET; |
4d680419 FT |
1969 | rport = srp_rport_add(host, &ids); |
1970 | if (IS_ERR(rport)) | |
1971 | goto add_srp_port_failed; | |
1972 | ||
1da177e4 LT |
1973 | /* Try to send an initialization message. Note that this is allowed |
1974 | * to fail if the other end is not acive. In that case we don't | |
1975 | * want to scan | |
1976 | */ | |
d3849d51 | 1977 | if (ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0) == 0 |
cefbda2d | 1978 | || rc == H_RESOURCE) { |
1da177e4 LT |
1979 | /* |
1980 | * Wait around max init_timeout secs for the adapter to finish | |
1981 | * initializing. When we are done initializing, we will have a | |
1982 | * valid request_limit. We don't want Linux scanning before | |
1983 | * we are ready. | |
1984 | */ | |
1985 | for (wait_switch = jiffies + (init_timeout * HZ); | |
1986 | time_before(jiffies, wait_switch) && | |
1987 | atomic_read(&hostdata->request_limit) < 2;) { | |
1988 | ||
1989 | msleep(10); | |
1990 | } | |
1991 | ||
1992 | /* if we now have a valid request_limit, initiate a scan */ | |
1993 | if (atomic_read(&hostdata->request_limit) > 0) | |
1994 | scsi_scan_host(host); | |
1995 | } | |
1996 | ||
559fde70 | 1997 | dev_set_drvdata(&vdev->dev, hostdata); |
1da177e4 LT |
1998 | return 0; |
1999 | ||
4d680419 FT |
2000 | add_srp_port_failed: |
2001 | scsi_remove_host(hostdata->host); | |
1da177e4 LT |
2002 | add_host_failed: |
2003 | release_event_pool(&hostdata->pool, hostdata); | |
2004 | init_pool_failed: | |
4f10aae0 | 2005 | ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata, max_events); |
0f33ece5 BK |
2006 | kill_kthread: |
2007 | kthread_stop(hostdata->work_thread); | |
1da177e4 | 2008 | init_crq_failed: |
126c5cc3 BK |
2009 | unmap_persist_bufs(hostdata); |
2010 | persist_bufs_failed: | |
1da177e4 LT |
2011 | scsi_host_put(host); |
2012 | scsi_host_alloc_failed: | |
2013 | return -1; | |
2014 | } | |
2015 | ||
2016 | static int ibmvscsi_remove(struct vio_dev *vdev) | |
2017 | { | |
559fde70 | 2018 | struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev); |
126c5cc3 | 2019 | unmap_persist_bufs(hostdata); |
1da177e4 | 2020 | release_event_pool(&hostdata->pool, hostdata); |
d3849d51 | 2021 | ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata, |
4f10aae0 | 2022 | max_events); |
4d680419 | 2023 | |
0f33ece5 | 2024 | kthread_stop(hostdata->work_thread); |
4d680419 | 2025 | srp_remove_host(hostdata->host); |
1da177e4 LT |
2026 | scsi_remove_host(hostdata->host); |
2027 | scsi_host_put(hostdata->host); | |
2028 | ||
2029 | return 0; | |
2030 | } | |
2031 | ||
64355b92 BK |
2032 | /** |
2033 | * ibmvscsi_resume: Resume from suspend | |
2034 | * @dev: device struct | |
2035 | * | |
2036 | * We may have lost an interrupt across suspend/resume, so kick the | |
2037 | * interrupt handler | |
2038 | */ | |
2039 | static int ibmvscsi_resume(struct device *dev) | |
2040 | { | |
2041 | struct ibmvscsi_host_data *hostdata = dev_get_drvdata(dev); | |
2042 | return ibmvscsi_ops->resume(hostdata); | |
2043 | } | |
2044 | ||
1da177e4 LT |
2045 | /** |
2046 | * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we | |
2047 | * support. | |
2048 | */ | |
2049 | static struct vio_device_id ibmvscsi_device_table[] __devinitdata = { | |
2050 | {"vscsi", "IBM,v-scsi"}, | |
fb120da6 | 2051 | { "", "" } |
1da177e4 | 2052 | }; |
1da177e4 | 2053 | MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table); |
915124d8 | 2054 | |
64355b92 BK |
2055 | static struct dev_pm_ops ibmvscsi_pm_ops = { |
2056 | .resume = ibmvscsi_resume | |
2057 | }; | |
2058 | ||
1da177e4 | 2059 | static struct vio_driver ibmvscsi_driver = { |
1da177e4 LT |
2060 | .id_table = ibmvscsi_device_table, |
2061 | .probe = ibmvscsi_probe, | |
6fdf5392 | 2062 | .remove = ibmvscsi_remove, |
7912a0ac | 2063 | .get_desired_dma = ibmvscsi_get_desired_dma, |
cb52d897 BH |
2064 | .name = "ibmvscsi", |
2065 | .pm = &ibmvscsi_pm_ops, | |
1da177e4 LT |
2066 | }; |
2067 | ||
4d680419 FT |
2068 | static struct srp_function_template ibmvscsi_transport_functions = { |
2069 | }; | |
2070 | ||
1da177e4 LT |
2071 | int __init ibmvscsi_module_init(void) |
2072 | { | |
4d680419 FT |
2073 | int ret; |
2074 | ||
4f10aae0 BK |
2075 | /* Ensure we have two requests to do error recovery */ |
2076 | driver_template.can_queue = max_requests; | |
2077 | max_events = max_requests + 2; | |
2078 | ||
7834799a | 2079 | if (firmware_has_feature(FW_FEATURE_VIO)) |
d3849d51 DW |
2080 | ibmvscsi_ops = &rpavscsi_ops; |
2081 | else | |
2082 | return -ENODEV; | |
2083 | ||
4d680419 FT |
2084 | ibmvscsi_transport_template = |
2085 | srp_attach_transport(&ibmvscsi_transport_functions); | |
2086 | if (!ibmvscsi_transport_template) | |
2087 | return -ENOMEM; | |
2088 | ||
2089 | ret = vio_register_driver(&ibmvscsi_driver); | |
2090 | if (ret) | |
2091 | srp_release_transport(ibmvscsi_transport_template); | |
2092 | return ret; | |
1da177e4 LT |
2093 | } |
2094 | ||
2095 | void __exit ibmvscsi_module_exit(void) | |
2096 | { | |
2097 | vio_unregister_driver(&ibmvscsi_driver); | |
4d680419 | 2098 | srp_release_transport(ibmvscsi_transport_template); |
1da177e4 LT |
2099 | } |
2100 | ||
2101 | module_init(ibmvscsi_module_init); | |
2102 | module_exit(ibmvscsi_module_exit); |