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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> | |
5a0e3ad6 | 73 | #include <linux/slab.h> |
126c5cc3 | 74 | #include <linux/of.h> |
64355b92 | 75 | #include <linux/pm.h> |
d3849d51 | 76 | #include <asm/firmware.h> |
1da177e4 LT |
77 | #include <asm/vio.h> |
78 | #include <scsi/scsi.h> | |
79 | #include <scsi/scsi_cmnd.h> | |
80 | #include <scsi/scsi_host.h> | |
81 | #include <scsi/scsi_device.h> | |
4d680419 | 82 | #include <scsi/scsi_transport_srp.h> |
1da177e4 LT |
83 | #include "ibmvscsi.h" |
84 | ||
85 | /* The values below are somewhat arbitrary default values, but | |
86 | * OS/400 will use 3 busses (disks, CDs, tapes, I think.) | |
87 | * Note that there are 3 bits of channel value, 6 bits of id, and | |
88 | * 5 bits of LUN. | |
89 | */ | |
90 | static int max_id = 64; | |
91 | static int max_channel = 3; | |
e1a5ce5b RJ |
92 | static int init_timeout = 300; |
93 | static int login_timeout = 60; | |
94 | static int info_timeout = 30; | |
95 | static int abort_timeout = 60; | |
96 | static int reset_timeout = 60; | |
a897ff2a | 97 | static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT; |
4f10aae0 | 98 | static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2; |
c1988e31 | 99 | static int fast_fail = 1; |
126c5cc3 | 100 | static int client_reserve = 1; |
1da177e4 | 101 | |
4d680419 FT |
102 | static struct scsi_transport_template *ibmvscsi_transport_template; |
103 | ||
2b541f8f | 104 | #define IBMVSCSI_VERSION "1.5.8" |
1da177e4 | 105 | |
d3849d51 DW |
106 | static struct ibmvscsi_ops *ibmvscsi_ops; |
107 | ||
1da177e4 LT |
108 | MODULE_DESCRIPTION("IBM Virtual SCSI"); |
109 | MODULE_AUTHOR("Dave Boutcher"); | |
110 | MODULE_LICENSE("GPL"); | |
111 | MODULE_VERSION(IBMVSCSI_VERSION); | |
112 | ||
113 | module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR); | |
114 | MODULE_PARM_DESC(max_id, "Largest ID value for each channel"); | |
115 | module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR); | |
116 | MODULE_PARM_DESC(max_channel, "Largest channel value"); | |
117 | module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR); | |
118 | MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds"); | |
21465eda | 119 | module_param_named(max_requests, max_requests, int, S_IRUGO); |
1da177e4 | 120 | MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter"); |
c1988e31 RJ |
121 | module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR); |
122 | MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]"); | |
126c5cc3 BK |
123 | module_param_named(client_reserve, client_reserve, int, S_IRUGO ); |
124 | MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release"); | |
1da177e4 LT |
125 | |
126 | /* ------------------------------------------------------------ | |
127 | * Routines for the event pool and event structs | |
128 | */ | |
129 | /** | |
130 | * initialize_event_pool: - Allocates and initializes the event pool for a host | |
131 | * @pool: event_pool to be initialized | |
132 | * @size: Number of events in pool | |
133 | * @hostdata: ibmvscsi_host_data who owns the event pool | |
134 | * | |
135 | * Returns zero on success. | |
136 | */ | |
137 | static int initialize_event_pool(struct event_pool *pool, | |
138 | int size, struct ibmvscsi_host_data *hostdata) | |
139 | { | |
140 | int i; | |
141 | ||
142 | pool->size = size; | |
143 | pool->next = 0; | |
4c021dd1 | 144 | pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL); |
1da177e4 LT |
145 | if (!pool->events) |
146 | return -ENOMEM; | |
1da177e4 LT |
147 | |
148 | pool->iu_storage = | |
149 | dma_alloc_coherent(hostdata->dev, | |
150 | pool->size * sizeof(*pool->iu_storage), | |
151 | &pool->iu_token, 0); | |
152 | if (!pool->iu_storage) { | |
153 | kfree(pool->events); | |
154 | return -ENOMEM; | |
155 | } | |
156 | ||
157 | for (i = 0; i < pool->size; ++i) { | |
158 | struct srp_event_struct *evt = &pool->events[i]; | |
159 | memset(&evt->crq, 0x00, sizeof(evt->crq)); | |
160 | atomic_set(&evt->free, 1); | |
161 | evt->crq.valid = 0x80; | |
162 | evt->crq.IU_length = sizeof(*evt->xfer_iu); | |
163 | evt->crq.IU_data_ptr = pool->iu_token + | |
164 | sizeof(*evt->xfer_iu) * i; | |
165 | evt->xfer_iu = pool->iu_storage + i; | |
166 | evt->hostdata = hostdata; | |
4dddbc26 JB |
167 | evt->ext_list = NULL; |
168 | evt->ext_list_token = 0; | |
1da177e4 LT |
169 | } |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
174 | /** | |
175 | * release_event_pool: - Frees memory of an event pool of a host | |
176 | * @pool: event_pool to be released | |
177 | * @hostdata: ibmvscsi_host_data who owns the even pool | |
178 | * | |
179 | * Returns zero on success. | |
180 | */ | |
181 | static void release_event_pool(struct event_pool *pool, | |
182 | struct ibmvscsi_host_data *hostdata) | |
183 | { | |
184 | int i, in_use = 0; | |
4dddbc26 | 185 | for (i = 0; i < pool->size; ++i) { |
1da177e4 LT |
186 | if (atomic_read(&pool->events[i].free) != 1) |
187 | ++in_use; | |
4dddbc26 JB |
188 | if (pool->events[i].ext_list) { |
189 | dma_free_coherent(hostdata->dev, | |
ef265673 | 190 | SG_ALL * sizeof(struct srp_direct_buf), |
4dddbc26 JB |
191 | pool->events[i].ext_list, |
192 | pool->events[i].ext_list_token); | |
193 | } | |
194 | } | |
1da177e4 | 195 | if (in_use) |
6c0a60ec BK |
196 | dev_warn(hostdata->dev, "releasing event pool with %d " |
197 | "events still in use?\n", in_use); | |
1da177e4 LT |
198 | kfree(pool->events); |
199 | dma_free_coherent(hostdata->dev, | |
200 | pool->size * sizeof(*pool->iu_storage), | |
201 | pool->iu_storage, pool->iu_token); | |
202 | } | |
203 | ||
204 | /** | |
205 | * valid_event_struct: - Determines if event is valid. | |
206 | * @pool: event_pool that contains the event | |
207 | * @evt: srp_event_struct to be checked for validity | |
208 | * | |
209 | * Returns zero if event is invalid, one otherwise. | |
210 | */ | |
211 | static int valid_event_struct(struct event_pool *pool, | |
212 | struct srp_event_struct *evt) | |
213 | { | |
214 | int index = evt - pool->events; | |
215 | if (index < 0 || index >= pool->size) /* outside of bounds */ | |
216 | return 0; | |
217 | if (evt != pool->events + index) /* unaligned */ | |
218 | return 0; | |
219 | return 1; | |
220 | } | |
221 | ||
222 | /** | |
223 | * ibmvscsi_free-event_struct: - Changes status of event to "free" | |
224 | * @pool: event_pool that contains the event | |
225 | * @evt: srp_event_struct to be modified | |
226 | * | |
227 | */ | |
228 | static void free_event_struct(struct event_pool *pool, | |
229 | struct srp_event_struct *evt) | |
230 | { | |
231 | if (!valid_event_struct(pool, evt)) { | |
6c0a60ec BK |
232 | dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p " |
233 | "(not in pool %p)\n", evt, pool->events); | |
1da177e4 LT |
234 | return; |
235 | } | |
236 | if (atomic_inc_return(&evt->free) != 1) { | |
6c0a60ec BK |
237 | dev_err(evt->hostdata->dev, "Freeing event_struct %p " |
238 | "which is not in use!\n", evt); | |
1da177e4 LT |
239 | return; |
240 | } | |
241 | } | |
242 | ||
243 | /** | |
244 | * get_evt_struct: - Gets the next free event in pool | |
245 | * @pool: event_pool that contains the events to be searched | |
246 | * | |
247 | * Returns the next event in "free" state, and NULL if none are free. | |
248 | * Note that no synchronization is done here, we assume the host_lock | |
249 | * will syncrhonze things. | |
250 | */ | |
251 | static struct srp_event_struct *get_event_struct(struct event_pool *pool) | |
252 | { | |
253 | int i; | |
254 | int poolsize = pool->size; | |
255 | int offset = pool->next; | |
256 | ||
257 | for (i = 0; i < poolsize; i++) { | |
258 | offset = (offset + 1) % poolsize; | |
259 | if (!atomic_dec_if_positive(&pool->events[offset].free)) { | |
260 | pool->next = offset; | |
261 | return &pool->events[offset]; | |
262 | } | |
263 | } | |
264 | ||
265 | printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n"); | |
266 | return NULL; | |
267 | } | |
268 | ||
269 | /** | |
270 | * init_event_struct: Initialize fields in an event struct that are always | |
271 | * required. | |
272 | * @evt: The event | |
273 | * @done: Routine to call when the event is responded to | |
274 | * @format: SRP or MAD format | |
275 | * @timeout: timeout value set in the CRQ | |
276 | */ | |
277 | static void init_event_struct(struct srp_event_struct *evt_struct, | |
278 | void (*done) (struct srp_event_struct *), | |
279 | u8 format, | |
280 | int timeout) | |
281 | { | |
282 | evt_struct->cmnd = NULL; | |
283 | evt_struct->cmnd_done = NULL; | |
284 | evt_struct->sync_srp = NULL; | |
285 | evt_struct->crq.format = format; | |
286 | evt_struct->crq.timeout = timeout; | |
287 | evt_struct->done = done; | |
288 | } | |
289 | ||
290 | /* ------------------------------------------------------------ | |
291 | * Routines for receiving SCSI responses from the hosting partition | |
292 | */ | |
293 | ||
294 | /** | |
295 | * set_srp_direction: Set the fields in the srp related to data | |
296 | * direction and number of buffers based on the direction in | |
297 | * the scsi_cmnd and the number of buffers | |
298 | */ | |
299 | static void set_srp_direction(struct scsi_cmnd *cmd, | |
300 | struct srp_cmd *srp_cmd, | |
301 | int numbuf) | |
302 | { | |
ef265673 FT |
303 | u8 fmt; |
304 | ||
1da177e4 LT |
305 | if (numbuf == 0) |
306 | return; | |
307 | ||
ef265673 FT |
308 | if (numbuf == 1) |
309 | fmt = SRP_DATA_DESC_DIRECT; | |
310 | else { | |
311 | fmt = SRP_DATA_DESC_INDIRECT; | |
312 | numbuf = min(numbuf, MAX_INDIRECT_BUFS); | |
313 | ||
1da177e4 | 314 | if (cmd->sc_data_direction == DMA_TO_DEVICE) |
ef265673 FT |
315 | srp_cmd->data_out_desc_cnt = numbuf; |
316 | else | |
317 | srp_cmd->data_in_desc_cnt = numbuf; | |
1da177e4 | 318 | } |
ef265673 FT |
319 | |
320 | if (cmd->sc_data_direction == DMA_TO_DEVICE) | |
321 | srp_cmd->buf_fmt = fmt << 4; | |
322 | else | |
323 | srp_cmd->buf_fmt = fmt; | |
1da177e4 LT |
324 | } |
325 | ||
ef265673 | 326 | static void unmap_sg_list(int num_entries, |
4dddbc26 | 327 | struct device *dev, |
ef265673 FT |
328 | struct srp_direct_buf *md) |
329 | { | |
4dddbc26 JB |
330 | int i; |
331 | ||
ef265673 FT |
332 | for (i = 0; i < num_entries; ++i) |
333 | dma_unmap_single(dev, md[i].va, md[i].len, DMA_BIDIRECTIONAL); | |
4dddbc26 JB |
334 | } |
335 | ||
1da177e4 LT |
336 | /** |
337 | * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format | |
338 | * @cmd: srp_cmd whose additional_data member will be unmapped | |
339 | * @dev: device for which the memory is mapped | |
340 | * | |
341 | */ | |
4dddbc26 JB |
342 | static void unmap_cmd_data(struct srp_cmd *cmd, |
343 | struct srp_event_struct *evt_struct, | |
344 | struct device *dev) | |
1da177e4 | 345 | { |
ef265673 FT |
346 | u8 out_fmt, in_fmt; |
347 | ||
348 | out_fmt = cmd->buf_fmt >> 4; | |
349 | in_fmt = cmd->buf_fmt & ((1U << 4) - 1); | |
350 | ||
351 | if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC) | |
1da177e4 | 352 | return; |
ef265673 FT |
353 | else if (out_fmt == SRP_DATA_DESC_DIRECT || |
354 | in_fmt == SRP_DATA_DESC_DIRECT) { | |
355 | struct srp_direct_buf *data = | |
356 | (struct srp_direct_buf *) cmd->add_data; | |
357 | dma_unmap_single(dev, data->va, data->len, DMA_BIDIRECTIONAL); | |
1da177e4 | 358 | } else { |
ef265673 FT |
359 | struct srp_indirect_buf *indirect = |
360 | (struct srp_indirect_buf *) cmd->add_data; | |
361 | int num_mapped = indirect->table_desc.len / | |
362 | sizeof(struct srp_direct_buf); | |
4dddbc26 JB |
363 | |
364 | if (num_mapped <= MAX_INDIRECT_BUFS) { | |
ef265673 | 365 | unmap_sg_list(num_mapped, dev, &indirect->desc_list[0]); |
4dddbc26 | 366 | return; |
1da177e4 | 367 | } |
4dddbc26 JB |
368 | |
369 | unmap_sg_list(num_mapped, dev, evt_struct->ext_list); | |
1da177e4 LT |
370 | } |
371 | } | |
372 | ||
9413d7b8 | 373 | static int map_sg_list(struct scsi_cmnd *cmd, int nseg, |
ef265673 | 374 | struct srp_direct_buf *md) |
4dddbc26 JB |
375 | { |
376 | int i; | |
9413d7b8 | 377 | struct scatterlist *sg; |
4dddbc26 JB |
378 | u64 total_length = 0; |
379 | ||
9413d7b8 | 380 | scsi_for_each_sg(cmd, sg, nseg, i) { |
ef265673 | 381 | struct srp_direct_buf *descr = md + i; |
9413d7b8 FT |
382 | descr->va = sg_dma_address(sg); |
383 | descr->len = sg_dma_len(sg); | |
ef265673 | 384 | descr->key = 0; |
9413d7b8 | 385 | total_length += sg_dma_len(sg); |
4dddbc26 JB |
386 | } |
387 | return total_length; | |
388 | } | |
389 | ||
1da177e4 LT |
390 | /** |
391 | * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields | |
392 | * @cmd: Scsi_Cmnd with the scatterlist | |
393 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
394 | * @dev: device for which to map dma memory | |
395 | * | |
396 | * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd. | |
397 | * Returns 1 on success. | |
398 | */ | |
399 | static int map_sg_data(struct scsi_cmnd *cmd, | |
4dddbc26 | 400 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
401 | struct srp_cmd *srp_cmd, struct device *dev) |
402 | { | |
403 | ||
4dddbc26 | 404 | int sg_mapped; |
1da177e4 | 405 | u64 total_length = 0; |
ef265673 FT |
406 | struct srp_direct_buf *data = |
407 | (struct srp_direct_buf *) srp_cmd->add_data; | |
408 | struct srp_indirect_buf *indirect = | |
409 | (struct srp_indirect_buf *) data; | |
1da177e4 | 410 | |
9413d7b8 FT |
411 | sg_mapped = scsi_dma_map(cmd); |
412 | if (!sg_mapped) | |
413 | return 1; | |
414 | else if (sg_mapped < 0) | |
1da177e4 LT |
415 | return 0; |
416 | ||
417 | set_srp_direction(cmd, srp_cmd, sg_mapped); | |
418 | ||
419 | /* special case; we can use a single direct descriptor */ | |
420 | if (sg_mapped == 1) { | |
9413d7b8 | 421 | map_sg_list(cmd, sg_mapped, data); |
1da177e4 LT |
422 | return 1; |
423 | } | |
424 | ||
ef265673 FT |
425 | indirect->table_desc.va = 0; |
426 | indirect->table_desc.len = sg_mapped * sizeof(struct srp_direct_buf); | |
427 | indirect->table_desc.key = 0; | |
4dddbc26 JB |
428 | |
429 | if (sg_mapped <= MAX_INDIRECT_BUFS) { | |
9413d7b8 | 430 | total_length = map_sg_list(cmd, sg_mapped, |
ef265673 FT |
431 | &indirect->desc_list[0]); |
432 | indirect->len = total_length; | |
4dddbc26 | 433 | return 1; |
1da177e4 | 434 | } |
1da177e4 | 435 | |
4dddbc26 JB |
436 | /* get indirect table */ |
437 | if (!evt_struct->ext_list) { | |
ef265673 | 438 | evt_struct->ext_list = (struct srp_direct_buf *) |
9413d7b8 | 439 | dma_alloc_coherent(dev, |
ef265673 FT |
440 | SG_ALL * sizeof(struct srp_direct_buf), |
441 | &evt_struct->ext_list_token, 0); | |
4dddbc26 | 442 | if (!evt_struct->ext_list) { |
7912a0ac RJ |
443 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
444 | sdev_printk(KERN_ERR, cmd->device, | |
445 | "Can't allocate memory " | |
446 | "for indirect table\n"); | |
e637d553 | 447 | scsi_dma_unmap(cmd); |
4dddbc26 | 448 | return 0; |
4dddbc26 JB |
449 | } |
450 | } | |
451 | ||
9413d7b8 | 452 | total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list); |
4dddbc26 | 453 | |
ef265673 FT |
454 | indirect->len = total_length; |
455 | indirect->table_desc.va = evt_struct->ext_list_token; | |
456 | indirect->table_desc.len = sg_mapped * sizeof(indirect->desc_list[0]); | |
457 | memcpy(indirect->desc_list, evt_struct->ext_list, | |
458 | MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf)); | |
4dddbc26 | 459 | return 1; |
1da177e4 LT |
460 | } |
461 | ||
1da177e4 LT |
462 | /** |
463 | * map_data_for_srp_cmd: - Calls functions to map data for srp cmds | |
464 | * @cmd: struct scsi_cmnd with the memory to be mapped | |
465 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
466 | * @dev: dma device for which to map dma memory | |
467 | * | |
468 | * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds | |
469 | * Returns 1 on success. | |
470 | */ | |
471 | static int map_data_for_srp_cmd(struct scsi_cmnd *cmd, | |
4dddbc26 | 472 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
473 | struct srp_cmd *srp_cmd, struct device *dev) |
474 | { | |
475 | switch (cmd->sc_data_direction) { | |
476 | case DMA_FROM_DEVICE: | |
477 | case DMA_TO_DEVICE: | |
478 | break; | |
479 | case DMA_NONE: | |
480 | return 1; | |
481 | case DMA_BIDIRECTIONAL: | |
6c0a60ec BK |
482 | sdev_printk(KERN_ERR, cmd->device, |
483 | "Can't map DMA_BIDIRECTIONAL to read/write\n"); | |
1da177e4 LT |
484 | return 0; |
485 | default: | |
6c0a60ec BK |
486 | sdev_printk(KERN_ERR, cmd->device, |
487 | "Unknown data direction 0x%02x; can't map!\n", | |
488 | cmd->sc_data_direction); | |
1da177e4 LT |
489 | return 0; |
490 | } | |
491 | ||
9413d7b8 | 492 | return map_sg_data(cmd, evt_struct, srp_cmd, dev); |
1da177e4 LT |
493 | } |
494 | ||
3d0e91f7 BK |
495 | /** |
496 | * purge_requests: Our virtual adapter just shut down. purge any sent requests | |
497 | * @hostdata: the adapter | |
498 | */ | |
499 | static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code) | |
500 | { | |
501 | struct srp_event_struct *tmp_evt, *pos; | |
502 | unsigned long flags; | |
503 | ||
504 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
505 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { | |
506 | list_del(&tmp_evt->list); | |
507 | del_timer(&tmp_evt->timer); | |
508 | if (tmp_evt->cmnd) { | |
509 | tmp_evt->cmnd->result = (error_code << 16); | |
510 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, | |
511 | tmp_evt, | |
512 | tmp_evt->hostdata->dev); | |
513 | if (tmp_evt->cmnd_done) | |
514 | tmp_evt->cmnd_done(tmp_evt->cmnd); | |
515 | } else if (tmp_evt->done) | |
516 | tmp_evt->done(tmp_evt); | |
517 | free_event_struct(&tmp_evt->hostdata->pool, tmp_evt); | |
518 | } | |
519 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
520 | } | |
521 | ||
522 | /** | |
523 | * ibmvscsi_reset_host - Reset the connection to the server | |
524 | * @hostdata: struct ibmvscsi_host_data to reset | |
525 | */ | |
526 | static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata) | |
527 | { | |
528 | scsi_block_requests(hostdata->host); | |
529 | atomic_set(&hostdata->request_limit, 0); | |
530 | ||
531 | purge_requests(hostdata, DID_ERROR); | |
d3849d51 DW |
532 | if ((ibmvscsi_ops->reset_crq_queue(&hostdata->queue, hostdata)) || |
533 | (ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0)) || | |
3d0e91f7 BK |
534 | (vio_enable_interrupts(to_vio_dev(hostdata->dev)))) { |
535 | atomic_set(&hostdata->request_limit, -1); | |
536 | dev_err(hostdata->dev, "error after reset\n"); | |
537 | } | |
538 | ||
539 | scsi_unblock_requests(hostdata->host); | |
540 | } | |
541 | ||
542 | /** | |
543 | * ibmvscsi_timeout - Internal command timeout handler | |
544 | * @evt_struct: struct srp_event_struct that timed out | |
545 | * | |
546 | * Called when an internally generated command times out | |
547 | */ | |
548 | static void ibmvscsi_timeout(struct srp_event_struct *evt_struct) | |
549 | { | |
550 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
551 | ||
552 | dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n", | |
553 | evt_struct->iu.srp.cmd.opcode); | |
554 | ||
555 | ibmvscsi_reset_host(hostdata); | |
556 | } | |
557 | ||
558 | ||
1da177e4 LT |
559 | /* ------------------------------------------------------------ |
560 | * Routines for sending and receiving SRPs | |
561 | */ | |
562 | /** | |
563 | * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq() | |
564 | * @evt_struct: evt_struct to be sent | |
565 | * @hostdata: ibmvscsi_host_data of host | |
3d0e91f7 | 566 | * @timeout: timeout in seconds - 0 means do not time command |
1da177e4 LT |
567 | * |
568 | * Returns the value returned from ibmvscsi_send_crq(). (Zero for success) | |
569 | * Note that this routine assumes that host_lock is held for synchronization | |
570 | */ | |
571 | static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct, | |
3d0e91f7 BK |
572 | struct ibmvscsi_host_data *hostdata, |
573 | unsigned long timeout) | |
1da177e4 | 574 | { |
1da177e4 | 575 | u64 *crq_as_u64 = (u64 *) &evt_struct->crq; |
3c887e8a | 576 | int request_status = 0; |
1da177e4 LT |
577 | int rc; |
578 | ||
a897ff2a RJ |
579 | /* If we have exhausted our request limit, just fail this request, |
580 | * unless it is for a reset or abort. | |
1da177e4 LT |
581 | * Note that there are rare cases involving driver generated requests |
582 | * (such as task management requests) that the mid layer may think we | |
583 | * can handle more requests (can_queue) when we actually can't | |
584 | */ | |
cefbda2d DB |
585 | if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) { |
586 | request_status = | |
587 | atomic_dec_if_positive(&hostdata->request_limit); | |
588 | /* If request limit was -1 when we started, it is now even | |
589 | * less than that | |
590 | */ | |
591 | if (request_status < -1) | |
592 | goto send_error; | |
a897ff2a | 593 | /* Otherwise, we may have run out of requests. */ |
3c887e8a RJ |
594 | /* If request limit was 0 when we started the adapter is in the |
595 | * process of performing a login with the server adapter, or | |
596 | * we may have run out of requests. | |
597 | */ | |
598 | else if (request_status == -1 && | |
599 | evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ) | |
600 | goto send_busy; | |
a897ff2a RJ |
601 | /* Abort and reset calls should make it through. |
602 | * Nothing except abort and reset should use the last two | |
603 | * slots unless we had two or less to begin with. | |
604 | */ | |
605 | else if (request_status < 2 && | |
606 | evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) { | |
607 | /* In the case that we have less than two requests | |
608 | * available, check the server limit as a combination | |
609 | * of the request limit and the number of requests | |
610 | * in-flight (the size of the send list). If the | |
611 | * server limit is greater than 2, return busy so | |
612 | * that the last two are reserved for reset and abort. | |
613 | */ | |
614 | int server_limit = request_status; | |
615 | struct srp_event_struct *tmp_evt; | |
616 | ||
617 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
618 | server_limit++; | |
619 | } | |
620 | ||
621 | if (server_limit > 2) | |
622 | goto send_busy; | |
623 | } | |
cefbda2d | 624 | } |
1da177e4 LT |
625 | |
626 | /* Copy the IU into the transfer area */ | |
627 | *evt_struct->xfer_iu = evt_struct->iu; | |
ef265673 | 628 | evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct; |
1da177e4 LT |
629 | |
630 | /* Add this to the sent list. We need to do this | |
631 | * before we actually send | |
632 | * in case it comes back REALLY fast | |
633 | */ | |
634 | list_add_tail(&evt_struct->list, &hostdata->sent); | |
635 | ||
3d0e91f7 BK |
636 | init_timer(&evt_struct->timer); |
637 | if (timeout) { | |
638 | evt_struct->timer.data = (unsigned long) evt_struct; | |
639 | evt_struct->timer.expires = jiffies + (timeout * HZ); | |
640 | evt_struct->timer.function = (void (*)(unsigned long))ibmvscsi_timeout; | |
641 | add_timer(&evt_struct->timer); | |
642 | } | |
643 | ||
1da177e4 | 644 | if ((rc = |
d3849d51 | 645 | ibmvscsi_ops->send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) { |
1da177e4 | 646 | list_del(&evt_struct->list); |
3d0e91f7 | 647 | del_timer(&evt_struct->timer); |
1da177e4 | 648 | |
860784c8 RJ |
649 | /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY. |
650 | * Firmware will send a CRQ with a transport event (0xFF) to | |
651 | * tell this client what has happened to the transport. This | |
652 | * will be handled in ibmvscsi_handle_crq() | |
653 | */ | |
654 | if (rc == H_CLOSED) { | |
655 | dev_warn(hostdata->dev, "send warning. " | |
656 | "Receive queue closed, will retry.\n"); | |
657 | goto send_busy; | |
658 | } | |
6c0a60ec | 659 | dev_err(hostdata->dev, "send error %d\n", rc); |
a897ff2a | 660 | atomic_inc(&hostdata->request_limit); |
1da177e4 LT |
661 | goto send_error; |
662 | } | |
663 | ||
664 | return 0; | |
665 | ||
cefbda2d | 666 | send_busy: |
4dddbc26 | 667 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); |
1da177e4 | 668 | |
1da177e4 | 669 | free_event_struct(&hostdata->pool, evt_struct); |
3c887e8a RJ |
670 | if (request_status != -1) |
671 | atomic_inc(&hostdata->request_limit); | |
a897ff2a | 672 | return SCSI_MLQUEUE_HOST_BUSY; |
cefbda2d DB |
673 | |
674 | send_error: | |
675 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); | |
676 | ||
677 | if (evt_struct->cmnd != NULL) { | |
678 | evt_struct->cmnd->result = DID_ERROR << 16; | |
679 | evt_struct->cmnd_done(evt_struct->cmnd); | |
680 | } else if (evt_struct->done) | |
681 | evt_struct->done(evt_struct); | |
682 | ||
683 | free_event_struct(&hostdata->pool, evt_struct); | |
684 | return 0; | |
1da177e4 LT |
685 | } |
686 | ||
687 | /** | |
688 | * handle_cmd_rsp: - Handle responses from commands | |
689 | * @evt_struct: srp_event_struct to be handled | |
690 | * | |
691 | * Used as a callback by when sending scsi cmds. | |
692 | * Gets called by ibmvscsi_handle_crq() | |
693 | */ | |
694 | static void handle_cmd_rsp(struct srp_event_struct *evt_struct) | |
695 | { | |
696 | struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp; | |
697 | struct scsi_cmnd *cmnd = evt_struct->cmnd; | |
698 | ||
ef265673 | 699 | if (unlikely(rsp->opcode != SRP_RSP)) { |
1da177e4 | 700 | if (printk_ratelimit()) |
6c0a60ec BK |
701 | dev_warn(evt_struct->hostdata->dev, |
702 | "bad SRP RSP type %d\n", rsp->opcode); | |
1da177e4 LT |
703 | } |
704 | ||
705 | if (cmnd) { | |
c3a3b55a | 706 | cmnd->result |= rsp->status; |
1da177e4 LT |
707 | if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION) |
708 | memcpy(cmnd->sense_buffer, | |
ef265673 FT |
709 | rsp->data, |
710 | rsp->sense_data_len); | |
1da177e4 | 711 | unmap_cmd_data(&evt_struct->iu.srp.cmd, |
4dddbc26 | 712 | evt_struct, |
1da177e4 LT |
713 | evt_struct->hostdata->dev); |
714 | ||
ef265673 | 715 | if (rsp->flags & SRP_RSP_FLAG_DOOVER) |
9413d7b8 | 716 | scsi_set_resid(cmnd, rsp->data_out_res_cnt); |
ef265673 | 717 | else if (rsp->flags & SRP_RSP_FLAG_DIOVER) |
9413d7b8 | 718 | scsi_set_resid(cmnd, rsp->data_in_res_cnt); |
1da177e4 LT |
719 | } |
720 | ||
721 | if (evt_struct->cmnd_done) | |
722 | evt_struct->cmnd_done(cmnd); | |
723 | } | |
724 | ||
725 | /** | |
726 | * lun_from_dev: - Returns the lun of the scsi device | |
727 | * @dev: struct scsi_device | |
728 | * | |
729 | */ | |
730 | static inline u16 lun_from_dev(struct scsi_device *dev) | |
731 | { | |
732 | return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun; | |
733 | } | |
734 | ||
735 | /** | |
736 | * ibmvscsi_queue: - The queuecommand function of the scsi template | |
737 | * @cmd: struct scsi_cmnd to be executed | |
738 | * @done: Callback function to be called when cmd is completed | |
739 | */ | |
740 | static int ibmvscsi_queuecommand(struct scsi_cmnd *cmnd, | |
741 | void (*done) (struct scsi_cmnd *)) | |
742 | { | |
743 | struct srp_cmd *srp_cmd; | |
744 | struct srp_event_struct *evt_struct; | |
ef265673 | 745 | struct srp_indirect_buf *indirect; |
7603e02e | 746 | struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host); |
1da177e4 | 747 | u16 lun = lun_from_dev(cmnd->device); |
ef265673 | 748 | u8 out_fmt, in_fmt; |
1da177e4 | 749 | |
c3a3b55a | 750 | cmnd->result = (DID_OK << 16); |
1da177e4 LT |
751 | evt_struct = get_event_struct(&hostdata->pool); |
752 | if (!evt_struct) | |
753 | return SCSI_MLQUEUE_HOST_BUSY; | |
754 | ||
1da177e4 LT |
755 | /* Set up the actual SRP IU */ |
756 | srp_cmd = &evt_struct->iu.srp.cmd; | |
ef265673 FT |
757 | memset(srp_cmd, 0x00, SRP_MAX_IU_LEN); |
758 | srp_cmd->opcode = SRP_CMD; | |
64a87b24 | 759 | memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb)); |
1da177e4 LT |
760 | srp_cmd->lun = ((u64) lun) << 48; |
761 | ||
4dddbc26 | 762 | if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) { |
7912a0ac RJ |
763 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
764 | sdev_printk(KERN_ERR, cmnd->device, | |
765 | "couldn't convert cmd to srp_cmd\n"); | |
1da177e4 LT |
766 | free_event_struct(&hostdata->pool, evt_struct); |
767 | return SCSI_MLQUEUE_HOST_BUSY; | |
768 | } | |
769 | ||
4dddbc26 JB |
770 | init_event_struct(evt_struct, |
771 | handle_cmd_rsp, | |
772 | VIOSRP_SRP_FORMAT, | |
242f9dcb | 773 | cmnd->request->timeout/HZ); |
4dddbc26 JB |
774 | |
775 | evt_struct->cmnd = cmnd; | |
776 | evt_struct->cmnd_done = done; | |
777 | ||
1da177e4 | 778 | /* Fix up dma address of the buffer itself */ |
ef265673 FT |
779 | indirect = (struct srp_indirect_buf *) srp_cmd->add_data; |
780 | out_fmt = srp_cmd->buf_fmt >> 4; | |
781 | in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1); | |
782 | if ((in_fmt == SRP_DATA_DESC_INDIRECT || | |
783 | out_fmt == SRP_DATA_DESC_INDIRECT) && | |
784 | indirect->table_desc.va == 0) { | |
785 | indirect->table_desc.va = evt_struct->crq.IU_data_ptr + | |
786 | offsetof(struct srp_cmd, add_data) + | |
787 | offsetof(struct srp_indirect_buf, desc_list); | |
1da177e4 LT |
788 | } |
789 | ||
3d0e91f7 | 790 | return ibmvscsi_send_srp_event(evt_struct, hostdata, 0); |
1da177e4 LT |
791 | } |
792 | ||
793 | /* ------------------------------------------------------------ | |
794 | * Routines for driver initialization | |
795 | */ | |
3507e13f | 796 | |
126c5cc3 BK |
797 | /** |
798 | * map_persist_bufs: - Pre-map persistent data for adapter logins | |
799 | * @hostdata: ibmvscsi_host_data of host | |
800 | * | |
801 | * Map the capabilities and adapter info DMA buffers to avoid runtime failures. | |
802 | * Return 1 on error, 0 on success. | |
803 | */ | |
804 | static int map_persist_bufs(struct ibmvscsi_host_data *hostdata) | |
805 | { | |
806 | ||
807 | hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps, | |
808 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
809 | ||
810 | if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) { | |
811 | dev_err(hostdata->dev, "Unable to map capabilities buffer!\n"); | |
812 | return 1; | |
813 | } | |
814 | ||
815 | hostdata->adapter_info_addr = dma_map_single(hostdata->dev, | |
816 | &hostdata->madapter_info, | |
817 | sizeof(hostdata->madapter_info), | |
818 | DMA_BIDIRECTIONAL); | |
819 | if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) { | |
820 | dev_err(hostdata->dev, "Unable to map adapter info buffer!\n"); | |
821 | dma_unmap_single(hostdata->dev, hostdata->caps_addr, | |
822 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
823 | return 1; | |
824 | } | |
825 | ||
826 | return 0; | |
827 | } | |
828 | ||
829 | /** | |
830 | * unmap_persist_bufs: - Unmap persistent data needed for adapter logins | |
831 | * @hostdata: ibmvscsi_host_data of host | |
832 | * | |
833 | * Unmap the capabilities and adapter info DMA buffers | |
834 | */ | |
835 | static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata) | |
836 | { | |
837 | dma_unmap_single(hostdata->dev, hostdata->caps_addr, | |
838 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
839 | ||
840 | dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr, | |
841 | sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL); | |
842 | } | |
843 | ||
3507e13f BK |
844 | /** |
845 | * login_rsp: - Handle response to SRP login request | |
846 | * @evt_struct: srp_event_struct with the response | |
847 | * | |
848 | * Used as a "done" callback by when sending srp_login. Gets called | |
849 | * by ibmvscsi_handle_crq() | |
850 | */ | |
851 | static void login_rsp(struct srp_event_struct *evt_struct) | |
852 | { | |
853 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
854 | switch (evt_struct->xfer_iu->srp.login_rsp.opcode) { | |
855 | case SRP_LOGIN_RSP: /* it worked! */ | |
856 | break; | |
857 | case SRP_LOGIN_REJ: /* refused! */ | |
858 | dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n", | |
859 | evt_struct->xfer_iu->srp.login_rej.reason); | |
860 | /* Login failed. */ | |
861 | atomic_set(&hostdata->request_limit, -1); | |
862 | return; | |
863 | default: | |
864 | dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n", | |
865 | evt_struct->xfer_iu->srp.login_rsp.opcode); | |
866 | /* Login failed. */ | |
867 | atomic_set(&hostdata->request_limit, -1); | |
868 | return; | |
869 | } | |
870 | ||
871 | dev_info(hostdata->dev, "SRP_LOGIN succeeded\n"); | |
126c5cc3 | 872 | hostdata->client_migrated = 0; |
3507e13f BK |
873 | |
874 | /* Now we know what the real request-limit is. | |
875 | * This value is set rather than added to request_limit because | |
876 | * request_limit could have been set to -1 by this client. | |
877 | */ | |
878 | atomic_set(&hostdata->request_limit, | |
879 | evt_struct->xfer_iu->srp.login_rsp.req_lim_delta); | |
880 | ||
881 | /* If we had any pending I/Os, kick them */ | |
882 | scsi_unblock_requests(hostdata->host); | |
883 | } | |
884 | ||
885 | /** | |
886 | * send_srp_login: - Sends the srp login | |
887 | * @hostdata: ibmvscsi_host_data of host | |
888 | * | |
889 | * Returns zero if successful. | |
890 | */ | |
891 | static int send_srp_login(struct ibmvscsi_host_data *hostdata) | |
892 | { | |
893 | int rc; | |
894 | unsigned long flags; | |
895 | struct srp_login_req *login; | |
896 | struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool); | |
897 | ||
898 | BUG_ON(!evt_struct); | |
899 | init_event_struct(evt_struct, login_rsp, | |
900 | VIOSRP_SRP_FORMAT, login_timeout); | |
901 | ||
902 | login = &evt_struct->iu.srp.login_req; | |
903 | memset(login, 0, sizeof(*login)); | |
904 | login->opcode = SRP_LOGIN_REQ; | |
905 | login->req_it_iu_len = sizeof(union srp_iu); | |
906 | login->req_buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT; | |
907 | ||
908 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
909 | /* Start out with a request limit of 0, since this is negotiated in | |
910 | * the login request we are just sending and login requests always | |
911 | * get sent by the driver regardless of request_limit. | |
912 | */ | |
913 | atomic_set(&hostdata->request_limit, 0); | |
914 | ||
915 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2); | |
916 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
917 | dev_info(hostdata->dev, "sent SRP login\n"); | |
918 | return rc; | |
919 | }; | |
920 | ||
126c5cc3 BK |
921 | /** |
922 | * capabilities_rsp: - Handle response to MAD adapter capabilities request | |
923 | * @evt_struct: srp_event_struct with the response | |
924 | * | |
925 | * Used as a "done" callback by when sending adapter_info. | |
926 | */ | |
927 | static void capabilities_rsp(struct srp_event_struct *evt_struct) | |
928 | { | |
929 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
930 | ||
931 | if (evt_struct->xfer_iu->mad.capabilities.common.status) { | |
932 | dev_err(hostdata->dev, "error 0x%X getting capabilities info\n", | |
933 | evt_struct->xfer_iu->mad.capabilities.common.status); | |
934 | } else { | |
935 | if (hostdata->caps.migration.common.server_support != SERVER_SUPPORTS_CAP) | |
936 | dev_info(hostdata->dev, "Partition migration not supported\n"); | |
937 | ||
938 | if (client_reserve) { | |
939 | if (hostdata->caps.reserve.common.server_support == | |
940 | SERVER_SUPPORTS_CAP) | |
941 | dev_info(hostdata->dev, "Client reserve enabled\n"); | |
942 | else | |
943 | dev_info(hostdata->dev, "Client reserve not supported\n"); | |
944 | } | |
945 | } | |
946 | ||
947 | send_srp_login(hostdata); | |
948 | } | |
949 | ||
950 | /** | |
951 | * send_mad_capabilities: - Sends the mad capabilities request | |
952 | * and stores the result so it can be retrieved with | |
953 | * @hostdata: ibmvscsi_host_data of host | |
954 | */ | |
955 | static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata) | |
956 | { | |
957 | struct viosrp_capabilities *req; | |
958 | struct srp_event_struct *evt_struct; | |
959 | unsigned long flags; | |
960 | struct device_node *of_node = hostdata->dev->archdata.of_node; | |
961 | const char *location; | |
962 | ||
963 | evt_struct = get_event_struct(&hostdata->pool); | |
964 | BUG_ON(!evt_struct); | |
965 | ||
966 | init_event_struct(evt_struct, capabilities_rsp, | |
967 | VIOSRP_MAD_FORMAT, info_timeout); | |
968 | ||
969 | req = &evt_struct->iu.mad.capabilities; | |
970 | memset(req, 0, sizeof(*req)); | |
971 | ||
972 | hostdata->caps.flags = CAP_LIST_SUPPORTED; | |
973 | if (hostdata->client_migrated) | |
974 | hostdata->caps.flags |= CLIENT_MIGRATED; | |
975 | ||
976 | strncpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev), | |
977 | sizeof(hostdata->caps.name)); | |
978 | hostdata->caps.name[sizeof(hostdata->caps.name) - 1] = '\0'; | |
979 | ||
980 | location = of_get_property(of_node, "ibm,loc-code", NULL); | |
981 | location = location ? location : dev_name(hostdata->dev); | |
982 | strncpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc)); | |
983 | hostdata->caps.loc[sizeof(hostdata->caps.loc) - 1] = '\0'; | |
984 | ||
985 | req->common.type = VIOSRP_CAPABILITIES_TYPE; | |
986 | req->buffer = hostdata->caps_addr; | |
987 | ||
988 | hostdata->caps.migration.common.cap_type = MIGRATION_CAPABILITIES; | |
989 | hostdata->caps.migration.common.length = sizeof(hostdata->caps.migration); | |
990 | hostdata->caps.migration.common.server_support = SERVER_SUPPORTS_CAP; | |
991 | hostdata->caps.migration.ecl = 1; | |
992 | ||
993 | if (client_reserve) { | |
994 | hostdata->caps.reserve.common.cap_type = RESERVATION_CAPABILITIES; | |
995 | hostdata->caps.reserve.common.length = sizeof(hostdata->caps.reserve); | |
996 | hostdata->caps.reserve.common.server_support = SERVER_SUPPORTS_CAP; | |
997 | hostdata->caps.reserve.type = CLIENT_RESERVE_SCSI_2; | |
998 | req->common.length = sizeof(hostdata->caps); | |
999 | } else | |
1000 | req->common.length = sizeof(hostdata->caps) - sizeof(hostdata->caps.reserve); | |
1001 | ||
1002 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1003 | if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) | |
1004 | dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n"); | |
1005 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1006 | }; | |
1007 | ||
c1988e31 RJ |
1008 | /** |
1009 | * fast_fail_rsp: - Handle response to MAD enable fast fail | |
1010 | * @evt_struct: srp_event_struct with the response | |
1011 | * | |
1012 | * Used as a "done" callback by when sending enable fast fail. Gets called | |
1013 | * by ibmvscsi_handle_crq() | |
1014 | */ | |
1015 | static void fast_fail_rsp(struct srp_event_struct *evt_struct) | |
1016 | { | |
1017 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
1018 | u8 status = evt_struct->xfer_iu->mad.fast_fail.common.status; | |
1019 | ||
1020 | if (status == VIOSRP_MAD_NOT_SUPPORTED) | |
1021 | dev_err(hostdata->dev, "fast_fail not supported in server\n"); | |
1022 | else if (status == VIOSRP_MAD_FAILED) | |
1023 | dev_err(hostdata->dev, "fast_fail request failed\n"); | |
1024 | else if (status != VIOSRP_MAD_SUCCESS) | |
1025 | dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status); | |
1026 | ||
126c5cc3 | 1027 | send_mad_capabilities(hostdata); |
c1988e31 RJ |
1028 | } |
1029 | ||
1030 | /** | |
1031 | * init_host - Start host initialization | |
1032 | * @hostdata: ibmvscsi_host_data of host | |
1033 | * | |
1034 | * Returns zero if successful. | |
1035 | */ | |
1036 | static int enable_fast_fail(struct ibmvscsi_host_data *hostdata) | |
1037 | { | |
1038 | int rc; | |
1039 | unsigned long flags; | |
1040 | struct viosrp_fast_fail *fast_fail_mad; | |
1041 | struct srp_event_struct *evt_struct; | |
1042 | ||
126c5cc3 BK |
1043 | if (!fast_fail) { |
1044 | send_mad_capabilities(hostdata); | |
1045 | return 0; | |
1046 | } | |
c1988e31 RJ |
1047 | |
1048 | evt_struct = get_event_struct(&hostdata->pool); | |
1049 | BUG_ON(!evt_struct); | |
1050 | ||
1051 | init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout); | |
1052 | ||
1053 | fast_fail_mad = &evt_struct->iu.mad.fast_fail; | |
1054 | memset(fast_fail_mad, 0, sizeof(*fast_fail_mad)); | |
1055 | fast_fail_mad->common.type = VIOSRP_ENABLE_FAST_FAIL; | |
1056 | fast_fail_mad->common.length = sizeof(*fast_fail_mad); | |
1057 | ||
1058 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1059 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2); | |
1060 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1061 | return rc; | |
1062 | } | |
1063 | ||
1da177e4 LT |
1064 | /** |
1065 | * adapter_info_rsp: - Handle response to MAD adapter info request | |
1066 | * @evt_struct: srp_event_struct with the response | |
1067 | * | |
1068 | * Used as a "done" callback by when sending adapter_info. Gets called | |
1069 | * by ibmvscsi_handle_crq() | |
1070 | */ | |
1071 | static void adapter_info_rsp(struct srp_event_struct *evt_struct) | |
1072 | { | |
1073 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
1da177e4 LT |
1074 | |
1075 | if (evt_struct->xfer_iu->mad.adapter_info.common.status) { | |
6c0a60ec BK |
1076 | dev_err(hostdata->dev, "error %d getting adapter info\n", |
1077 | evt_struct->xfer_iu->mad.adapter_info.common.status); | |
1da177e4 | 1078 | } else { |
6c0a60ec BK |
1079 | dev_info(hostdata->dev, "host srp version: %s, " |
1080 | "host partition %s (%d), OS %d, max io %u\n", | |
1081 | hostdata->madapter_info.srp_version, | |
1082 | hostdata->madapter_info.partition_name, | |
1083 | hostdata->madapter_info.partition_number, | |
1084 | hostdata->madapter_info.os_type, | |
1085 | hostdata->madapter_info.port_max_txu[0]); | |
1da177e4 LT |
1086 | |
1087 | if (hostdata->madapter_info.port_max_txu[0]) | |
1088 | hostdata->host->max_sectors = | |
1089 | hostdata->madapter_info.port_max_txu[0] >> 9; | |
154fb614 DB |
1090 | |
1091 | if (hostdata->madapter_info.os_type == 3 && | |
1092 | strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) { | |
6c0a60ec BK |
1093 | dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n", |
1094 | hostdata->madapter_info.srp_version); | |
1095 | dev_err(hostdata->dev, "limiting scatterlists to %d\n", | |
1096 | MAX_INDIRECT_BUFS); | |
154fb614 DB |
1097 | hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS; |
1098 | } | |
e08afeb7 BK |
1099 | |
1100 | if (hostdata->madapter_info.os_type == 3) { | |
1101 | enable_fast_fail(hostdata); | |
1102 | return; | |
1103 | } | |
1da177e4 | 1104 | } |
3507e13f | 1105 | |
e08afeb7 | 1106 | send_srp_login(hostdata); |
1da177e4 LT |
1107 | } |
1108 | ||
1109 | /** | |
1110 | * send_mad_adapter_info: - Sends the mad adapter info request | |
1111 | * and stores the result so it can be retrieved with | |
1112 | * sysfs. We COULD consider causing a failure if the | |
1113 | * returned SRP version doesn't match ours. | |
1114 | * @hostdata: ibmvscsi_host_data of host | |
1115 | * | |
1116 | * Returns zero if successful. | |
1117 | */ | |
1118 | static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata) | |
1119 | { | |
1120 | struct viosrp_adapter_info *req; | |
1121 | struct srp_event_struct *evt_struct; | |
06f923cb | 1122 | unsigned long flags; |
e5dbfa66 | 1123 | |
1da177e4 | 1124 | evt_struct = get_event_struct(&hostdata->pool); |
3507e13f | 1125 | BUG_ON(!evt_struct); |
1da177e4 LT |
1126 | |
1127 | init_event_struct(evt_struct, | |
1128 | adapter_info_rsp, | |
1129 | VIOSRP_MAD_FORMAT, | |
e1a5ce5b | 1130 | info_timeout); |
1da177e4 LT |
1131 | |
1132 | req = &evt_struct->iu.mad.adapter_info; | |
1133 | memset(req, 0x00, sizeof(*req)); | |
1134 | ||
1135 | req->common.type = VIOSRP_ADAPTER_INFO_TYPE; | |
1136 | req->common.length = sizeof(hostdata->madapter_info); | |
126c5cc3 | 1137 | req->buffer = hostdata->adapter_info_addr; |
1da177e4 | 1138 | |
06f923cb | 1139 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
126c5cc3 | 1140 | if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) |
6c0a60ec | 1141 | dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n"); |
06f923cb | 1142 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1143 | }; |
1144 | ||
1145 | /** | |
3507e13f | 1146 | * init_adapter: Start virtual adapter initialization sequence |
1da177e4 | 1147 | * |
3507e13f BK |
1148 | */ |
1149 | static void init_adapter(struct ibmvscsi_host_data *hostdata) | |
1da177e4 | 1150 | { |
1da177e4 | 1151 | send_mad_adapter_info(hostdata); |
1da177e4 LT |
1152 | } |
1153 | ||
1da177e4 LT |
1154 | /** |
1155 | * sync_completion: Signal that a synchronous command has completed | |
1156 | * Note that after returning from this call, the evt_struct is freed. | |
1157 | * the caller waiting on this completion shouldn't touch the evt_struct | |
1158 | * again. | |
1159 | */ | |
1160 | static void sync_completion(struct srp_event_struct *evt_struct) | |
1161 | { | |
1162 | /* copy the response back */ | |
1163 | if (evt_struct->sync_srp) | |
1164 | *evt_struct->sync_srp = *evt_struct->xfer_iu; | |
1165 | ||
1166 | complete(&evt_struct->comp); | |
1167 | } | |
1168 | ||
1169 | /** | |
1170 | * ibmvscsi_abort: Abort a command...from scsi host template | |
1171 | * send this over to the server and wait synchronously for the response | |
1172 | */ | |
1173 | static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd) | |
1174 | { | |
7603e02e | 1175 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 LT |
1176 | struct srp_tsk_mgmt *tsk_mgmt; |
1177 | struct srp_event_struct *evt; | |
1178 | struct srp_event_struct *tmp_evt, *found_evt; | |
1179 | union viosrp_iu srp_rsp; | |
1180 | int rsp_rc; | |
be042f24 | 1181 | unsigned long flags; |
1da177e4 | 1182 | u16 lun = lun_from_dev(cmd->device); |
860784c8 | 1183 | unsigned long wait_switch = 0; |
1da177e4 LT |
1184 | |
1185 | /* First, find this command in our sent list so we can figure | |
1186 | * out the correct tag | |
1187 | */ | |
be042f24 | 1188 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
860784c8 RJ |
1189 | wait_switch = jiffies + (init_timeout * HZ); |
1190 | do { | |
1191 | found_evt = NULL; | |
1192 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
1193 | if (tmp_evt->cmnd == cmd) { | |
1194 | found_evt = tmp_evt; | |
1195 | break; | |
1196 | } | |
1da177e4 | 1197 | } |
1da177e4 | 1198 | |
860784c8 RJ |
1199 | if (!found_evt) { |
1200 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1201 | return SUCCESS; | |
1202 | } | |
1da177e4 | 1203 | |
860784c8 RJ |
1204 | evt = get_event_struct(&hostdata->pool); |
1205 | if (evt == NULL) { | |
1206 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1207 | sdev_printk(KERN_ERR, cmd->device, | |
1208 | "failed to allocate abort event\n"); | |
1209 | return FAILED; | |
1210 | } | |
1da177e4 | 1211 | |
860784c8 RJ |
1212 | init_event_struct(evt, |
1213 | sync_completion, | |
1214 | VIOSRP_SRP_FORMAT, | |
e1a5ce5b | 1215 | abort_timeout); |
1da177e4 | 1216 | |
860784c8 | 1217 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
1da177e4 | 1218 | |
860784c8 RJ |
1219 | /* Set up an abort SRP command */ |
1220 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
1221 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
1222 | tsk_mgmt->lun = ((u64) lun) << 48; | |
1223 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK; | |
1224 | tsk_mgmt->task_tag = (u64) found_evt; | |
1225 | ||
1226 | evt->sync_srp = &srp_rsp; | |
1227 | ||
1228 | init_completion(&evt->comp); | |
e1a5ce5b | 1229 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2); |
860784c8 RJ |
1230 | |
1231 | if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) | |
1232 | break; | |
1233 | ||
1234 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1235 | msleep(10); | |
1236 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1237 | } while (time_before(jiffies, wait_switch)); | |
1238 | ||
be042f24 | 1239 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
860784c8 | 1240 | |
be042f24 | 1241 | if (rsp_rc != 0) { |
6c0a60ec BK |
1242 | sdev_printk(KERN_ERR, cmd->device, |
1243 | "failed to send abort() event. rc=%d\n", rsp_rc); | |
1da177e4 LT |
1244 | return FAILED; |
1245 | } | |
1246 | ||
860784c8 | 1247 | sdev_printk(KERN_INFO, cmd->device, |
fe333321 | 1248 | "aborting command. lun 0x%llx, tag 0x%llx\n", |
860784c8 RJ |
1249 | (((u64) lun) << 48), (u64) found_evt); |
1250 | ||
1da177e4 | 1251 | wait_for_completion(&evt->comp); |
1da177e4 LT |
1252 | |
1253 | /* make sure we got a good response */ | |
ef265673 | 1254 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 | 1255 | if (printk_ratelimit()) |
6c0a60ec BK |
1256 | sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n", |
1257 | srp_rsp.srp.rsp.opcode); | |
1da177e4 LT |
1258 | return FAILED; |
1259 | } | |
1260 | ||
ef265673 FT |
1261 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1262 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1263 | else |
1264 | rsp_rc = srp_rsp.srp.rsp.status; | |
1265 | ||
1266 | if (rsp_rc) { | |
1267 | if (printk_ratelimit()) | |
6c0a60ec | 1268 | sdev_printk(KERN_WARNING, cmd->device, |
fe333321 | 1269 | "abort code %d for task tag 0x%llx\n", |
6c0a60ec | 1270 | rsp_rc, tsk_mgmt->task_tag); |
1da177e4 LT |
1271 | return FAILED; |
1272 | } | |
1273 | ||
1274 | /* Because we dropped the spinlock above, it's possible | |
1275 | * The event is no longer in our list. Make sure it didn't | |
1276 | * complete while we were aborting | |
1277 | */ | |
be042f24 | 1278 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1279 | found_evt = NULL; |
1280 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
1281 | if (tmp_evt->cmnd == cmd) { | |
1282 | found_evt = tmp_evt; | |
1283 | break; | |
1284 | } | |
1285 | } | |
1286 | ||
1287 | if (found_evt == NULL) { | |
be042f24 | 1288 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
fe333321 | 1289 | sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n", |
6c0a60ec | 1290 | tsk_mgmt->task_tag); |
1da177e4 LT |
1291 | return SUCCESS; |
1292 | } | |
1293 | ||
fe333321 | 1294 | sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n", |
6c0a60ec | 1295 | tsk_mgmt->task_tag); |
1da177e4 LT |
1296 | |
1297 | cmd->result = (DID_ABORT << 16); | |
1298 | list_del(&found_evt->list); | |
4dddbc26 JB |
1299 | unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt, |
1300 | found_evt->hostdata->dev); | |
1da177e4 | 1301 | free_event_struct(&found_evt->hostdata->pool, found_evt); |
be042f24 | 1302 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1303 | atomic_inc(&hostdata->request_limit); |
1304 | return SUCCESS; | |
1305 | } | |
1306 | ||
1307 | /** | |
1308 | * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host | |
1309 | * template send this over to the server and wait synchronously for the | |
1310 | * response | |
1311 | */ | |
1312 | static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd) | |
1313 | { | |
7603e02e | 1314 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 LT |
1315 | struct srp_tsk_mgmt *tsk_mgmt; |
1316 | struct srp_event_struct *evt; | |
1317 | struct srp_event_struct *tmp_evt, *pos; | |
1318 | union viosrp_iu srp_rsp; | |
1319 | int rsp_rc; | |
be042f24 | 1320 | unsigned long flags; |
1da177e4 | 1321 | u16 lun = lun_from_dev(cmd->device); |
860784c8 | 1322 | unsigned long wait_switch = 0; |
1da177e4 | 1323 | |
be042f24 | 1324 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
860784c8 RJ |
1325 | wait_switch = jiffies + (init_timeout * HZ); |
1326 | do { | |
1327 | evt = get_event_struct(&hostdata->pool); | |
1328 | if (evt == NULL) { | |
1329 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1330 | sdev_printk(KERN_ERR, cmd->device, | |
1331 | "failed to allocate reset event\n"); | |
1332 | return FAILED; | |
1333 | } | |
1da177e4 | 1334 | |
860784c8 RJ |
1335 | init_event_struct(evt, |
1336 | sync_completion, | |
1337 | VIOSRP_SRP_FORMAT, | |
e1a5ce5b | 1338 | reset_timeout); |
1da177e4 | 1339 | |
860784c8 | 1340 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
1da177e4 | 1341 | |
860784c8 RJ |
1342 | /* Set up a lun reset SRP command */ |
1343 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
1344 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
1345 | tsk_mgmt->lun = ((u64) lun) << 48; | |
1346 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET; | |
1da177e4 | 1347 | |
860784c8 RJ |
1348 | evt->sync_srp = &srp_rsp; |
1349 | ||
1350 | init_completion(&evt->comp); | |
e1a5ce5b | 1351 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2); |
860784c8 RJ |
1352 | |
1353 | if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) | |
1354 | break; | |
1355 | ||
1356 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1357 | msleep(10); | |
1358 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1359 | } while (time_before(jiffies, wait_switch)); | |
1da177e4 | 1360 | |
be042f24 | 1361 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
860784c8 | 1362 | |
be042f24 | 1363 | if (rsp_rc != 0) { |
6c0a60ec BK |
1364 | sdev_printk(KERN_ERR, cmd->device, |
1365 | "failed to send reset event. rc=%d\n", rsp_rc); | |
1da177e4 LT |
1366 | return FAILED; |
1367 | } | |
1368 | ||
fe333321 | 1369 | sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n", |
860784c8 RJ |
1370 | (((u64) lun) << 48)); |
1371 | ||
1da177e4 | 1372 | wait_for_completion(&evt->comp); |
1da177e4 LT |
1373 | |
1374 | /* make sure we got a good response */ | |
ef265673 | 1375 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 | 1376 | if (printk_ratelimit()) |
6c0a60ec BK |
1377 | sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n", |
1378 | srp_rsp.srp.rsp.opcode); | |
1da177e4 LT |
1379 | return FAILED; |
1380 | } | |
1381 | ||
ef265673 FT |
1382 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1383 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1384 | else |
1385 | rsp_rc = srp_rsp.srp.rsp.status; | |
1386 | ||
1387 | if (rsp_rc) { | |
1388 | if (printk_ratelimit()) | |
6c0a60ec | 1389 | sdev_printk(KERN_WARNING, cmd->device, |
fe333321 | 1390 | "reset code %d for task tag 0x%llx\n", |
6c0a60ec | 1391 | rsp_rc, tsk_mgmt->task_tag); |
1da177e4 LT |
1392 | return FAILED; |
1393 | } | |
1394 | ||
1395 | /* We need to find all commands for this LUN that have not yet been | |
1396 | * responded to, and fail them with DID_RESET | |
1397 | */ | |
be042f24 | 1398 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1399 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { |
1400 | if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) { | |
1401 | if (tmp_evt->cmnd) | |
1402 | tmp_evt->cmnd->result = (DID_RESET << 16); | |
1403 | list_del(&tmp_evt->list); | |
4dddbc26 JB |
1404 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt, |
1405 | tmp_evt->hostdata->dev); | |
1da177e4 LT |
1406 | free_event_struct(&tmp_evt->hostdata->pool, |
1407 | tmp_evt); | |
1408 | atomic_inc(&hostdata->request_limit); | |
1409 | if (tmp_evt->cmnd_done) | |
1410 | tmp_evt->cmnd_done(tmp_evt->cmnd); | |
1411 | else if (tmp_evt->done) | |
1412 | tmp_evt->done(tmp_evt); | |
1413 | } | |
1414 | } | |
be042f24 | 1415 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1416 | return SUCCESS; |
1417 | } | |
1418 | ||
1419 | /** | |
3d0e91f7 BK |
1420 | * ibmvscsi_eh_host_reset_handler - Reset the connection to the server |
1421 | * @cmd: struct scsi_cmnd having problems | |
1422 | */ | |
1423 | static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd) | |
1da177e4 | 1424 | { |
3d0e91f7 | 1425 | unsigned long wait_switch = 0; |
7603e02e | 1426 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 | 1427 | |
3d0e91f7 BK |
1428 | dev_err(hostdata->dev, "Resetting connection due to error recovery\n"); |
1429 | ||
1430 | ibmvscsi_reset_host(hostdata); | |
1431 | ||
1432 | for (wait_switch = jiffies + (init_timeout * HZ); | |
1433 | time_before(jiffies, wait_switch) && | |
1434 | atomic_read(&hostdata->request_limit) < 2;) { | |
1435 | ||
1436 | msleep(10); | |
1da177e4 | 1437 | } |
3d0e91f7 BK |
1438 | |
1439 | if (atomic_read(&hostdata->request_limit) <= 0) | |
1440 | return FAILED; | |
1441 | ||
1442 | return SUCCESS; | |
1da177e4 LT |
1443 | } |
1444 | ||
1445 | /** | |
1446 | * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ | |
1447 | * @crq: Command/Response queue | |
1448 | * @hostdata: ibmvscsi_host_data of host | |
1449 | * | |
1450 | */ | |
1451 | void ibmvscsi_handle_crq(struct viosrp_crq *crq, | |
1452 | struct ibmvscsi_host_data *hostdata) | |
1453 | { | |
6c0a60ec | 1454 | long rc; |
1da177e4 LT |
1455 | unsigned long flags; |
1456 | struct srp_event_struct *evt_struct = | |
1457 | (struct srp_event_struct *)crq->IU_data_ptr; | |
1458 | switch (crq->valid) { | |
1459 | case 0xC0: /* initialization */ | |
1460 | switch (crq->format) { | |
1461 | case 0x01: /* Initialization message */ | |
6c0a60ec | 1462 | dev_info(hostdata->dev, "partner initialized\n"); |
1da177e4 | 1463 | /* Send back a response */ |
d3849d51 DW |
1464 | if ((rc = ibmvscsi_ops->send_crq(hostdata, |
1465 | 0xC002000000000000LL, 0)) == 0) { | |
1da177e4 | 1466 | /* Now login */ |
3507e13f | 1467 | init_adapter(hostdata); |
1da177e4 | 1468 | } else { |
6c0a60ec | 1469 | dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc); |
1da177e4 LT |
1470 | } |
1471 | ||
1472 | break; | |
1473 | case 0x02: /* Initialization response */ | |
6c0a60ec | 1474 | dev_info(hostdata->dev, "partner initialization complete\n"); |
1da177e4 LT |
1475 | |
1476 | /* Now login */ | |
3507e13f | 1477 | init_adapter(hostdata); |
1da177e4 LT |
1478 | break; |
1479 | default: | |
6c0a60ec | 1480 | dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format); |
1da177e4 LT |
1481 | } |
1482 | return; | |
2b541f8f DB |
1483 | case 0xFF: /* Hypervisor telling us the connection is closed */ |
1484 | scsi_block_requests(hostdata->host); | |
cefbda2d | 1485 | atomic_set(&hostdata->request_limit, 0); |
2b541f8f DB |
1486 | if (crq->format == 0x06) { |
1487 | /* We need to re-setup the interpartition connection */ | |
6c0a60ec | 1488 | dev_info(hostdata->dev, "Re-enabling adapter!\n"); |
126c5cc3 | 1489 | hostdata->client_migrated = 1; |
2b541f8f | 1490 | purge_requests(hostdata, DID_REQUEUE); |
d3849d51 DW |
1491 | if ((ibmvscsi_ops->reenable_crq_queue(&hostdata->queue, |
1492 | hostdata)) || | |
1493 | (ibmvscsi_ops->send_crq(hostdata, | |
1494 | 0xC001000000000000LL, 0))) { | |
cefbda2d DB |
1495 | atomic_set(&hostdata->request_limit, |
1496 | -1); | |
6c0a60ec | 1497 | dev_err(hostdata->dev, "error after enable\n"); |
cefbda2d | 1498 | } |
2b541f8f | 1499 | } else { |
6c0a60ec BK |
1500 | dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n", |
1501 | crq->format); | |
1da177e4 | 1502 | |
2b541f8f | 1503 | purge_requests(hostdata, DID_ERROR); |
d3849d51 DW |
1504 | if ((ibmvscsi_ops->reset_crq_queue(&hostdata->queue, |
1505 | hostdata)) || | |
1506 | (ibmvscsi_ops->send_crq(hostdata, | |
1507 | 0xC001000000000000LL, 0))) { | |
cefbda2d DB |
1508 | atomic_set(&hostdata->request_limit, |
1509 | -1); | |
6c0a60ec | 1510 | dev_err(hostdata->dev, "error after reset\n"); |
cefbda2d | 1511 | } |
2b541f8f DB |
1512 | } |
1513 | scsi_unblock_requests(hostdata->host); | |
1da177e4 LT |
1514 | return; |
1515 | case 0x80: /* real payload */ | |
1516 | break; | |
1517 | default: | |
6c0a60ec BK |
1518 | dev_err(hostdata->dev, "got an invalid message type 0x%02x\n", |
1519 | crq->valid); | |
1da177e4 LT |
1520 | return; |
1521 | } | |
1522 | ||
1523 | /* The only kind of payload CRQs we should get are responses to | |
1524 | * things we send. Make sure this response is to something we | |
1525 | * actually sent | |
1526 | */ | |
1527 | if (!valid_event_struct(&hostdata->pool, evt_struct)) { | |
6c0a60ec | 1528 | dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n", |
1da177e4 LT |
1529 | (void *)crq->IU_data_ptr); |
1530 | return; | |
1531 | } | |
1532 | ||
1533 | if (atomic_read(&evt_struct->free)) { | |
6c0a60ec BK |
1534 | dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n", |
1535 | (void *)crq->IU_data_ptr); | |
1da177e4 LT |
1536 | return; |
1537 | } | |
1538 | ||
1539 | if (crq->format == VIOSRP_SRP_FORMAT) | |
ef265673 | 1540 | atomic_add(evt_struct->xfer_iu->srp.rsp.req_lim_delta, |
1da177e4 LT |
1541 | &hostdata->request_limit); |
1542 | ||
3d0e91f7 BK |
1543 | del_timer(&evt_struct->timer); |
1544 | ||
ca61668b | 1545 | if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd) |
c3a3b55a | 1546 | evt_struct->cmnd->result = DID_ERROR << 16; |
1da177e4 LT |
1547 | if (evt_struct->done) |
1548 | evt_struct->done(evt_struct); | |
1549 | else | |
6c0a60ec | 1550 | dev_err(hostdata->dev, "returned done() is NULL; not running it!\n"); |
1da177e4 LT |
1551 | |
1552 | /* | |
1553 | * Lock the host_lock before messing with these structures, since we | |
1554 | * are running in a task context | |
1555 | */ | |
1556 | spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags); | |
1557 | list_del(&evt_struct->list); | |
1558 | free_event_struct(&evt_struct->hostdata->pool, evt_struct); | |
1559 | spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags); | |
1560 | } | |
1561 | ||
1562 | /** | |
1563 | * ibmvscsi_get_host_config: Send the command to the server to get host | |
1564 | * configuration data. The data is opaque to us. | |
1565 | */ | |
1566 | static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata, | |
1567 | unsigned char *buffer, int length) | |
1568 | { | |
1569 | struct viosrp_host_config *host_config; | |
1570 | struct srp_event_struct *evt_struct; | |
06f923cb | 1571 | unsigned long flags; |
e5dbfa66 | 1572 | dma_addr_t addr; |
1da177e4 LT |
1573 | int rc; |
1574 | ||
1575 | evt_struct = get_event_struct(&hostdata->pool); | |
1576 | if (!evt_struct) { | |
6c0a60ec | 1577 | dev_err(hostdata->dev, "couldn't allocate event for HOST_CONFIG!\n"); |
1da177e4 LT |
1578 | return -1; |
1579 | } | |
1580 | ||
1581 | init_event_struct(evt_struct, | |
1582 | sync_completion, | |
1583 | VIOSRP_MAD_FORMAT, | |
e1a5ce5b | 1584 | info_timeout); |
1da177e4 LT |
1585 | |
1586 | host_config = &evt_struct->iu.mad.host_config; | |
1587 | ||
1588 | /* Set up a lun reset SRP command */ | |
1589 | memset(host_config, 0x00, sizeof(*host_config)); | |
1590 | host_config->common.type = VIOSRP_HOST_CONFIG_TYPE; | |
1591 | host_config->common.length = length; | |
e5dbfa66 FT |
1592 | host_config->buffer = addr = dma_map_single(hostdata->dev, buffer, |
1593 | length, | |
1594 | DMA_BIDIRECTIONAL); | |
1da177e4 | 1595 | |
8d8bb39b | 1596 | if (dma_mapping_error(hostdata->dev, host_config->buffer)) { |
7912a0ac RJ |
1597 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
1598 | dev_err(hostdata->dev, | |
1599 | "dma_mapping error getting host config\n"); | |
1da177e4 LT |
1600 | free_event_struct(&hostdata->pool, evt_struct); |
1601 | return -1; | |
1602 | } | |
1603 | ||
1604 | init_completion(&evt_struct->comp); | |
06f923cb | 1605 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
e1a5ce5b | 1606 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2); |
06f923cb | 1607 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
e5dbfa66 | 1608 | if (rc == 0) |
1da177e4 | 1609 | wait_for_completion(&evt_struct->comp); |
e5dbfa66 | 1610 | dma_unmap_single(hostdata->dev, addr, length, DMA_BIDIRECTIONAL); |
1da177e4 LT |
1611 | |
1612 | return rc; | |
1613 | } | |
1614 | ||
0979c84b RJ |
1615 | /** |
1616 | * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk. | |
1617 | * @sdev: struct scsi_device device to configure | |
1618 | * | |
1619 | * Enable allow_restart for a device if it is a disk. Adjust the | |
1620 | * queue_depth here also as is required by the documentation for | |
1621 | * struct scsi_host_template. | |
1622 | */ | |
1623 | static int ibmvscsi_slave_configure(struct scsi_device *sdev) | |
1624 | { | |
1625 | struct Scsi_Host *shost = sdev->host; | |
1626 | unsigned long lock_flags = 0; | |
1627 | ||
1628 | spin_lock_irqsave(shost->host_lock, lock_flags); | |
d1a357fc | 1629 | if (sdev->type == TYPE_DISK) { |
0979c84b | 1630 | sdev->allow_restart = 1; |
e1a5ce5b | 1631 | blk_queue_rq_timeout(sdev->request_queue, 120 * HZ); |
d1a357fc | 1632 | } |
0979c84b RJ |
1633 | scsi_adjust_queue_depth(sdev, 0, shost->cmd_per_lun); |
1634 | spin_unlock_irqrestore(shost->host_lock, lock_flags); | |
1635 | return 0; | |
1636 | } | |
1637 | ||
742d25b8 BK |
1638 | /** |
1639 | * ibmvscsi_change_queue_depth - Change the device's queue depth | |
1640 | * @sdev: scsi device struct | |
1641 | * @qdepth: depth to set | |
e881a172 | 1642 | * @reason: calling context |
742d25b8 BK |
1643 | * |
1644 | * Return value: | |
1645 | * actual depth set | |
1646 | **/ | |
e881a172 MC |
1647 | static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth, |
1648 | int reason) | |
742d25b8 | 1649 | { |
e881a172 MC |
1650 | if (reason != SCSI_QDEPTH_DEFAULT) |
1651 | return -EOPNOTSUPP; | |
1652 | ||
742d25b8 BK |
1653 | if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN) |
1654 | qdepth = IBMVSCSI_MAX_CMDS_PER_LUN; | |
1655 | ||
1656 | scsi_adjust_queue_depth(sdev, 0, qdepth); | |
1657 | return sdev->queue_depth; | |
1658 | } | |
1659 | ||
1da177e4 LT |
1660 | /* ------------------------------------------------------------ |
1661 | * sysfs attributes | |
1662 | */ | |
126c5cc3 BK |
1663 | static ssize_t show_host_vhost_loc(struct device *dev, |
1664 | struct device_attribute *attr, char *buf) | |
1665 | { | |
1666 | struct Scsi_Host *shost = class_to_shost(dev); | |
1667 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); | |
1668 | int len; | |
1669 | ||
1670 | len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n", | |
1671 | hostdata->caps.loc); | |
1672 | return len; | |
1673 | } | |
1674 | ||
1675 | static struct device_attribute ibmvscsi_host_vhost_loc = { | |
1676 | .attr = { | |
1677 | .name = "vhost_loc", | |
1678 | .mode = S_IRUGO, | |
1679 | }, | |
1680 | .show = show_host_vhost_loc, | |
1681 | }; | |
1682 | ||
1683 | static ssize_t show_host_vhost_name(struct device *dev, | |
1684 | struct device_attribute *attr, char *buf) | |
1685 | { | |
1686 | struct Scsi_Host *shost = class_to_shost(dev); | |
1687 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); | |
1688 | int len; | |
1689 | ||
1690 | len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n", | |
1691 | hostdata->caps.name); | |
1692 | return len; | |
1693 | } | |
1694 | ||
1695 | static struct device_attribute ibmvscsi_host_vhost_name = { | |
1696 | .attr = { | |
1697 | .name = "vhost_name", | |
1698 | .mode = S_IRUGO, | |
1699 | }, | |
1700 | .show = show_host_vhost_name, | |
1701 | }; | |
1702 | ||
ee959b00 TJ |
1703 | static ssize_t show_host_srp_version(struct device *dev, |
1704 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1705 | { |
ee959b00 | 1706 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1707 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1708 | int len; |
1709 | ||
1710 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1711 | hostdata->madapter_info.srp_version); | |
1712 | return len; | |
1713 | } | |
1714 | ||
ee959b00 | 1715 | static struct device_attribute ibmvscsi_host_srp_version = { |
1da177e4 LT |
1716 | .attr = { |
1717 | .name = "srp_version", | |
1718 | .mode = S_IRUGO, | |
1719 | }, | |
1720 | .show = show_host_srp_version, | |
1721 | }; | |
1722 | ||
ee959b00 TJ |
1723 | static ssize_t show_host_partition_name(struct device *dev, |
1724 | struct device_attribute *attr, | |
1da177e4 LT |
1725 | char *buf) |
1726 | { | |
ee959b00 | 1727 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1728 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1729 | int len; |
1730 | ||
1731 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1732 | hostdata->madapter_info.partition_name); | |
1733 | return len; | |
1734 | } | |
1735 | ||
ee959b00 | 1736 | static struct device_attribute ibmvscsi_host_partition_name = { |
1da177e4 LT |
1737 | .attr = { |
1738 | .name = "partition_name", | |
1739 | .mode = S_IRUGO, | |
1740 | }, | |
1741 | .show = show_host_partition_name, | |
1742 | }; | |
1743 | ||
ee959b00 TJ |
1744 | static ssize_t show_host_partition_number(struct device *dev, |
1745 | struct device_attribute *attr, | |
1da177e4 LT |
1746 | char *buf) |
1747 | { | |
ee959b00 | 1748 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1749 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1750 | int len; |
1751 | ||
1752 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
1753 | hostdata->madapter_info.partition_number); | |
1754 | return len; | |
1755 | } | |
1756 | ||
ee959b00 | 1757 | static struct device_attribute ibmvscsi_host_partition_number = { |
1da177e4 LT |
1758 | .attr = { |
1759 | .name = "partition_number", | |
1760 | .mode = S_IRUGO, | |
1761 | }, | |
1762 | .show = show_host_partition_number, | |
1763 | }; | |
1764 | ||
ee959b00 TJ |
1765 | static ssize_t show_host_mad_version(struct device *dev, |
1766 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1767 | { |
ee959b00 | 1768 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1769 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1770 | int len; |
1771 | ||
1772 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
1773 | hostdata->madapter_info.mad_version); | |
1774 | return len; | |
1775 | } | |
1776 | ||
ee959b00 | 1777 | static struct device_attribute ibmvscsi_host_mad_version = { |
1da177e4 LT |
1778 | .attr = { |
1779 | .name = "mad_version", | |
1780 | .mode = S_IRUGO, | |
1781 | }, | |
1782 | .show = show_host_mad_version, | |
1783 | }; | |
1784 | ||
ee959b00 TJ |
1785 | static ssize_t show_host_os_type(struct device *dev, |
1786 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1787 | { |
ee959b00 | 1788 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1789 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1790 | int len; |
1791 | ||
1792 | len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type); | |
1793 | return len; | |
1794 | } | |
1795 | ||
ee959b00 | 1796 | static struct device_attribute ibmvscsi_host_os_type = { |
1da177e4 LT |
1797 | .attr = { |
1798 | .name = "os_type", | |
1799 | .mode = S_IRUGO, | |
1800 | }, | |
1801 | .show = show_host_os_type, | |
1802 | }; | |
1803 | ||
ee959b00 TJ |
1804 | static ssize_t show_host_config(struct device *dev, |
1805 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1806 | { |
ee959b00 | 1807 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1808 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1809 | |
1810 | /* returns null-terminated host config data */ | |
1811 | if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0) | |
1812 | return strlen(buf); | |
1813 | else | |
1814 | return 0; | |
1815 | } | |
1816 | ||
ee959b00 | 1817 | static struct device_attribute ibmvscsi_host_config = { |
1da177e4 LT |
1818 | .attr = { |
1819 | .name = "config", | |
1820 | .mode = S_IRUGO, | |
1821 | }, | |
1822 | .show = show_host_config, | |
1823 | }; | |
1824 | ||
ee959b00 | 1825 | static struct device_attribute *ibmvscsi_attrs[] = { |
126c5cc3 BK |
1826 | &ibmvscsi_host_vhost_loc, |
1827 | &ibmvscsi_host_vhost_name, | |
1da177e4 LT |
1828 | &ibmvscsi_host_srp_version, |
1829 | &ibmvscsi_host_partition_name, | |
1830 | &ibmvscsi_host_partition_number, | |
1831 | &ibmvscsi_host_mad_version, | |
1832 | &ibmvscsi_host_os_type, | |
1833 | &ibmvscsi_host_config, | |
1834 | NULL | |
1835 | }; | |
1836 | ||
1837 | /* ------------------------------------------------------------ | |
1838 | * SCSI driver registration | |
1839 | */ | |
1840 | static struct scsi_host_template driver_template = { | |
1841 | .module = THIS_MODULE, | |
1842 | .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION, | |
1843 | .proc_name = "ibmvscsi", | |
1844 | .queuecommand = ibmvscsi_queuecommand, | |
1845 | .eh_abort_handler = ibmvscsi_eh_abort_handler, | |
1846 | .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler, | |
3d0e91f7 | 1847 | .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler, |
0979c84b | 1848 | .slave_configure = ibmvscsi_slave_configure, |
742d25b8 | 1849 | .change_queue_depth = ibmvscsi_change_queue_depth, |
7912a0ac | 1850 | .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT, |
a897ff2a | 1851 | .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT, |
1da177e4 | 1852 | .this_id = -1, |
4dddbc26 | 1853 | .sg_tablesize = SG_ALL, |
1da177e4 LT |
1854 | .use_clustering = ENABLE_CLUSTERING, |
1855 | .shost_attrs = ibmvscsi_attrs, | |
1856 | }; | |
1857 | ||
7912a0ac RJ |
1858 | /** |
1859 | * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver | |
1860 | * | |
1861 | * @vdev: struct vio_dev for the device whose desired IO mem is to be returned | |
1862 | * | |
1863 | * Return value: | |
1864 | * Number of bytes of IO data the driver will need to perform well. | |
1865 | */ | |
1866 | static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev) | |
1867 | { | |
1868 | /* iu_storage data allocated in initialize_event_pool */ | |
4f10aae0 | 1869 | unsigned long desired_io = max_events * sizeof(union viosrp_iu); |
7912a0ac RJ |
1870 | |
1871 | /* add io space for sg data */ | |
004dd5e8 | 1872 | desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 * |
7912a0ac RJ |
1873 | IBMVSCSI_CMDS_PER_LUN_DEFAULT); |
1874 | ||
1875 | return desired_io; | |
1876 | } | |
1877 | ||
1da177e4 LT |
1878 | /** |
1879 | * Called by bus code for each adapter | |
1880 | */ | |
1881 | static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id) | |
1882 | { | |
1883 | struct ibmvscsi_host_data *hostdata; | |
1884 | struct Scsi_Host *host; | |
1885 | struct device *dev = &vdev->dev; | |
4d680419 FT |
1886 | struct srp_rport_identifiers ids; |
1887 | struct srp_rport *rport; | |
1da177e4 | 1888 | unsigned long wait_switch = 0; |
cefbda2d | 1889 | int rc; |
1da177e4 | 1890 | |
559fde70 | 1891 | dev_set_drvdata(&vdev->dev, NULL); |
1da177e4 LT |
1892 | |
1893 | host = scsi_host_alloc(&driver_template, sizeof(*hostdata)); | |
1894 | if (!host) { | |
6c0a60ec | 1895 | dev_err(&vdev->dev, "couldn't allocate host data\n"); |
1da177e4 LT |
1896 | goto scsi_host_alloc_failed; |
1897 | } | |
1898 | ||
4d680419 | 1899 | host->transportt = ibmvscsi_transport_template; |
7603e02e | 1900 | hostdata = shost_priv(host); |
1da177e4 LT |
1901 | memset(hostdata, 0x00, sizeof(*hostdata)); |
1902 | INIT_LIST_HEAD(&hostdata->sent); | |
1903 | hostdata->host = host; | |
1904 | hostdata->dev = dev; | |
1905 | atomic_set(&hostdata->request_limit, -1); | |
7912a0ac | 1906 | hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT; |
1da177e4 | 1907 | |
126c5cc3 BK |
1908 | if (map_persist_bufs(hostdata)) { |
1909 | dev_err(&vdev->dev, "couldn't map persistent buffers\n"); | |
1910 | goto persist_bufs_failed; | |
1911 | } | |
1912 | ||
4f10aae0 | 1913 | rc = ibmvscsi_ops->init_crq_queue(&hostdata->queue, hostdata, max_events); |
cefbda2d | 1914 | if (rc != 0 && rc != H_RESOURCE) { |
6c0a60ec | 1915 | dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc); |
1da177e4 LT |
1916 | goto init_crq_failed; |
1917 | } | |
4f10aae0 | 1918 | if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) { |
6c0a60ec | 1919 | dev_err(&vdev->dev, "couldn't initialize event pool\n"); |
1da177e4 LT |
1920 | goto init_pool_failed; |
1921 | } | |
1922 | ||
1923 | host->max_lun = 8; | |
1924 | host->max_id = max_id; | |
1925 | host->max_channel = max_channel; | |
fbc56f08 | 1926 | host->max_cmd_len = 16; |
1da177e4 LT |
1927 | |
1928 | if (scsi_add_host(hostdata->host, hostdata->dev)) | |
1929 | goto add_host_failed; | |
1930 | ||
4d680419 FT |
1931 | /* we don't have a proper target_port_id so let's use the fake one */ |
1932 | memcpy(ids.port_id, hostdata->madapter_info.partition_name, | |
1933 | sizeof(ids.port_id)); | |
aebd5e47 | 1934 | ids.roles = SRP_RPORT_ROLE_TARGET; |
4d680419 FT |
1935 | rport = srp_rport_add(host, &ids); |
1936 | if (IS_ERR(rport)) | |
1937 | goto add_srp_port_failed; | |
1938 | ||
1da177e4 LT |
1939 | /* Try to send an initialization message. Note that this is allowed |
1940 | * to fail if the other end is not acive. In that case we don't | |
1941 | * want to scan | |
1942 | */ | |
d3849d51 | 1943 | if (ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0) == 0 |
cefbda2d | 1944 | || rc == H_RESOURCE) { |
1da177e4 LT |
1945 | /* |
1946 | * Wait around max init_timeout secs for the adapter to finish | |
1947 | * initializing. When we are done initializing, we will have a | |
1948 | * valid request_limit. We don't want Linux scanning before | |
1949 | * we are ready. | |
1950 | */ | |
1951 | for (wait_switch = jiffies + (init_timeout * HZ); | |
1952 | time_before(jiffies, wait_switch) && | |
1953 | atomic_read(&hostdata->request_limit) < 2;) { | |
1954 | ||
1955 | msleep(10); | |
1956 | } | |
1957 | ||
1958 | /* if we now have a valid request_limit, initiate a scan */ | |
1959 | if (atomic_read(&hostdata->request_limit) > 0) | |
1960 | scsi_scan_host(host); | |
1961 | } | |
1962 | ||
559fde70 | 1963 | dev_set_drvdata(&vdev->dev, hostdata); |
1da177e4 LT |
1964 | return 0; |
1965 | ||
4d680419 FT |
1966 | add_srp_port_failed: |
1967 | scsi_remove_host(hostdata->host); | |
1da177e4 LT |
1968 | add_host_failed: |
1969 | release_event_pool(&hostdata->pool, hostdata); | |
1970 | init_pool_failed: | |
4f10aae0 | 1971 | ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata, max_events); |
1da177e4 | 1972 | init_crq_failed: |
126c5cc3 BK |
1973 | unmap_persist_bufs(hostdata); |
1974 | persist_bufs_failed: | |
1da177e4 LT |
1975 | scsi_host_put(host); |
1976 | scsi_host_alloc_failed: | |
1977 | return -1; | |
1978 | } | |
1979 | ||
1980 | static int ibmvscsi_remove(struct vio_dev *vdev) | |
1981 | { | |
559fde70 | 1982 | struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev); |
126c5cc3 | 1983 | unmap_persist_bufs(hostdata); |
1da177e4 | 1984 | release_event_pool(&hostdata->pool, hostdata); |
d3849d51 | 1985 | ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata, |
4f10aae0 | 1986 | max_events); |
4d680419 FT |
1987 | |
1988 | srp_remove_host(hostdata->host); | |
1da177e4 LT |
1989 | scsi_remove_host(hostdata->host); |
1990 | scsi_host_put(hostdata->host); | |
1991 | ||
1992 | return 0; | |
1993 | } | |
1994 | ||
64355b92 BK |
1995 | /** |
1996 | * ibmvscsi_resume: Resume from suspend | |
1997 | * @dev: device struct | |
1998 | * | |
1999 | * We may have lost an interrupt across suspend/resume, so kick the | |
2000 | * interrupt handler | |
2001 | */ | |
2002 | static int ibmvscsi_resume(struct device *dev) | |
2003 | { | |
2004 | struct ibmvscsi_host_data *hostdata = dev_get_drvdata(dev); | |
2005 | return ibmvscsi_ops->resume(hostdata); | |
2006 | } | |
2007 | ||
1da177e4 LT |
2008 | /** |
2009 | * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we | |
2010 | * support. | |
2011 | */ | |
2012 | static struct vio_device_id ibmvscsi_device_table[] __devinitdata = { | |
2013 | {"vscsi", "IBM,v-scsi"}, | |
fb120da6 | 2014 | { "", "" } |
1da177e4 | 2015 | }; |
1da177e4 | 2016 | MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table); |
915124d8 | 2017 | |
64355b92 BK |
2018 | static struct dev_pm_ops ibmvscsi_pm_ops = { |
2019 | .resume = ibmvscsi_resume | |
2020 | }; | |
2021 | ||
1da177e4 | 2022 | static struct vio_driver ibmvscsi_driver = { |
1da177e4 LT |
2023 | .id_table = ibmvscsi_device_table, |
2024 | .probe = ibmvscsi_probe, | |
6fdf5392 | 2025 | .remove = ibmvscsi_remove, |
7912a0ac | 2026 | .get_desired_dma = ibmvscsi_get_desired_dma, |
6fdf5392 SR |
2027 | .driver = { |
2028 | .name = "ibmvscsi", | |
915124d8 | 2029 | .owner = THIS_MODULE, |
64355b92 | 2030 | .pm = &ibmvscsi_pm_ops, |
6fdf5392 | 2031 | } |
1da177e4 LT |
2032 | }; |
2033 | ||
4d680419 FT |
2034 | static struct srp_function_template ibmvscsi_transport_functions = { |
2035 | }; | |
2036 | ||
1da177e4 LT |
2037 | int __init ibmvscsi_module_init(void) |
2038 | { | |
4d680419 FT |
2039 | int ret; |
2040 | ||
4f10aae0 BK |
2041 | /* Ensure we have two requests to do error recovery */ |
2042 | driver_template.can_queue = max_requests; | |
2043 | max_events = max_requests + 2; | |
2044 | ||
d3849d51 DW |
2045 | if (firmware_has_feature(FW_FEATURE_ISERIES)) |
2046 | ibmvscsi_ops = &iseriesvscsi_ops; | |
2047 | else if (firmware_has_feature(FW_FEATURE_VIO)) | |
2048 | ibmvscsi_ops = &rpavscsi_ops; | |
2049 | else | |
2050 | return -ENODEV; | |
2051 | ||
4d680419 FT |
2052 | ibmvscsi_transport_template = |
2053 | srp_attach_transport(&ibmvscsi_transport_functions); | |
2054 | if (!ibmvscsi_transport_template) | |
2055 | return -ENOMEM; | |
2056 | ||
2057 | ret = vio_register_driver(&ibmvscsi_driver); | |
2058 | if (ret) | |
2059 | srp_release_transport(ibmvscsi_transport_template); | |
2060 | return ret; | |
1da177e4 LT |
2061 | } |
2062 | ||
2063 | void __exit ibmvscsi_module_exit(void) | |
2064 | { | |
2065 | vio_unregister_driver(&ibmvscsi_driver); | |
4d680419 | 2066 | srp_release_transport(ibmvscsi_transport_template); |
1da177e4 LT |
2067 | } |
2068 | ||
2069 | module_init(ibmvscsi_module_init); | |
2070 | module_exit(ibmvscsi_module_exit); |