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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 | |
43 | * puts the message in the next 16 byte space in round-robbin fashion, | |
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> | |
d3849d51 | 73 | #include <asm/firmware.h> |
1da177e4 LT |
74 | #include <asm/vio.h> |
75 | #include <scsi/scsi.h> | |
76 | #include <scsi/scsi_cmnd.h> | |
77 | #include <scsi/scsi_host.h> | |
78 | #include <scsi/scsi_device.h> | |
4d680419 | 79 | #include <scsi/scsi_transport_srp.h> |
1da177e4 LT |
80 | #include "ibmvscsi.h" |
81 | ||
82 | /* The values below are somewhat arbitrary default values, but | |
83 | * OS/400 will use 3 busses (disks, CDs, tapes, I think.) | |
84 | * Note that there are 3 bits of channel value, 6 bits of id, and | |
85 | * 5 bits of LUN. | |
86 | */ | |
87 | static int max_id = 64; | |
88 | static int max_channel = 3; | |
89 | static int init_timeout = 5; | |
a897ff2a | 90 | static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT; |
1da177e4 | 91 | |
4d680419 FT |
92 | static struct scsi_transport_template *ibmvscsi_transport_template; |
93 | ||
2b541f8f | 94 | #define IBMVSCSI_VERSION "1.5.8" |
1da177e4 | 95 | |
d3849d51 DW |
96 | static struct ibmvscsi_ops *ibmvscsi_ops; |
97 | ||
1da177e4 LT |
98 | MODULE_DESCRIPTION("IBM Virtual SCSI"); |
99 | MODULE_AUTHOR("Dave Boutcher"); | |
100 | MODULE_LICENSE("GPL"); | |
101 | MODULE_VERSION(IBMVSCSI_VERSION); | |
102 | ||
103 | module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR); | |
104 | MODULE_PARM_DESC(max_id, "Largest ID value for each channel"); | |
105 | module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR); | |
106 | MODULE_PARM_DESC(max_channel, "Largest channel value"); | |
107 | module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR); | |
108 | MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds"); | |
109 | module_param_named(max_requests, max_requests, int, S_IRUGO | S_IWUSR); | |
110 | MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter"); | |
111 | ||
112 | /* ------------------------------------------------------------ | |
113 | * Routines for the event pool and event structs | |
114 | */ | |
115 | /** | |
116 | * initialize_event_pool: - Allocates and initializes the event pool for a host | |
117 | * @pool: event_pool to be initialized | |
118 | * @size: Number of events in pool | |
119 | * @hostdata: ibmvscsi_host_data who owns the event pool | |
120 | * | |
121 | * Returns zero on success. | |
122 | */ | |
123 | static int initialize_event_pool(struct event_pool *pool, | |
124 | int size, struct ibmvscsi_host_data *hostdata) | |
125 | { | |
126 | int i; | |
127 | ||
128 | pool->size = size; | |
129 | pool->next = 0; | |
4c021dd1 | 130 | pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL); |
1da177e4 LT |
131 | if (!pool->events) |
132 | return -ENOMEM; | |
1da177e4 LT |
133 | |
134 | pool->iu_storage = | |
135 | dma_alloc_coherent(hostdata->dev, | |
136 | pool->size * sizeof(*pool->iu_storage), | |
137 | &pool->iu_token, 0); | |
138 | if (!pool->iu_storage) { | |
139 | kfree(pool->events); | |
140 | return -ENOMEM; | |
141 | } | |
142 | ||
143 | for (i = 0; i < pool->size; ++i) { | |
144 | struct srp_event_struct *evt = &pool->events[i]; | |
145 | memset(&evt->crq, 0x00, sizeof(evt->crq)); | |
146 | atomic_set(&evt->free, 1); | |
147 | evt->crq.valid = 0x80; | |
148 | evt->crq.IU_length = sizeof(*evt->xfer_iu); | |
149 | evt->crq.IU_data_ptr = pool->iu_token + | |
150 | sizeof(*evt->xfer_iu) * i; | |
151 | evt->xfer_iu = pool->iu_storage + i; | |
152 | evt->hostdata = hostdata; | |
4dddbc26 JB |
153 | evt->ext_list = NULL; |
154 | evt->ext_list_token = 0; | |
1da177e4 LT |
155 | } |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
160 | /** | |
161 | * release_event_pool: - Frees memory of an event pool of a host | |
162 | * @pool: event_pool to be released | |
163 | * @hostdata: ibmvscsi_host_data who owns the even pool | |
164 | * | |
165 | * Returns zero on success. | |
166 | */ | |
167 | static void release_event_pool(struct event_pool *pool, | |
168 | struct ibmvscsi_host_data *hostdata) | |
169 | { | |
170 | int i, in_use = 0; | |
4dddbc26 | 171 | for (i = 0; i < pool->size; ++i) { |
1da177e4 LT |
172 | if (atomic_read(&pool->events[i].free) != 1) |
173 | ++in_use; | |
4dddbc26 JB |
174 | if (pool->events[i].ext_list) { |
175 | dma_free_coherent(hostdata->dev, | |
ef265673 | 176 | SG_ALL * sizeof(struct srp_direct_buf), |
4dddbc26 JB |
177 | pool->events[i].ext_list, |
178 | pool->events[i].ext_list_token); | |
179 | } | |
180 | } | |
1da177e4 | 181 | if (in_use) |
6c0a60ec BK |
182 | dev_warn(hostdata->dev, "releasing event pool with %d " |
183 | "events still in use?\n", in_use); | |
1da177e4 LT |
184 | kfree(pool->events); |
185 | dma_free_coherent(hostdata->dev, | |
186 | pool->size * sizeof(*pool->iu_storage), | |
187 | pool->iu_storage, pool->iu_token); | |
188 | } | |
189 | ||
190 | /** | |
191 | * valid_event_struct: - Determines if event is valid. | |
192 | * @pool: event_pool that contains the event | |
193 | * @evt: srp_event_struct to be checked for validity | |
194 | * | |
195 | * Returns zero if event is invalid, one otherwise. | |
196 | */ | |
197 | static int valid_event_struct(struct event_pool *pool, | |
198 | struct srp_event_struct *evt) | |
199 | { | |
200 | int index = evt - pool->events; | |
201 | if (index < 0 || index >= pool->size) /* outside of bounds */ | |
202 | return 0; | |
203 | if (evt != pool->events + index) /* unaligned */ | |
204 | return 0; | |
205 | return 1; | |
206 | } | |
207 | ||
208 | /** | |
209 | * ibmvscsi_free-event_struct: - Changes status of event to "free" | |
210 | * @pool: event_pool that contains the event | |
211 | * @evt: srp_event_struct to be modified | |
212 | * | |
213 | */ | |
214 | static void free_event_struct(struct event_pool *pool, | |
215 | struct srp_event_struct *evt) | |
216 | { | |
217 | if (!valid_event_struct(pool, evt)) { | |
6c0a60ec BK |
218 | dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p " |
219 | "(not in pool %p)\n", evt, pool->events); | |
1da177e4 LT |
220 | return; |
221 | } | |
222 | if (atomic_inc_return(&evt->free) != 1) { | |
6c0a60ec BK |
223 | dev_err(evt->hostdata->dev, "Freeing event_struct %p " |
224 | "which is not in use!\n", evt); | |
1da177e4 LT |
225 | return; |
226 | } | |
227 | } | |
228 | ||
229 | /** | |
230 | * get_evt_struct: - Gets the next free event in pool | |
231 | * @pool: event_pool that contains the events to be searched | |
232 | * | |
233 | * Returns the next event in "free" state, and NULL if none are free. | |
234 | * Note that no synchronization is done here, we assume the host_lock | |
235 | * will syncrhonze things. | |
236 | */ | |
237 | static struct srp_event_struct *get_event_struct(struct event_pool *pool) | |
238 | { | |
239 | int i; | |
240 | int poolsize = pool->size; | |
241 | int offset = pool->next; | |
242 | ||
243 | for (i = 0; i < poolsize; i++) { | |
244 | offset = (offset + 1) % poolsize; | |
245 | if (!atomic_dec_if_positive(&pool->events[offset].free)) { | |
246 | pool->next = offset; | |
247 | return &pool->events[offset]; | |
248 | } | |
249 | } | |
250 | ||
251 | printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n"); | |
252 | return NULL; | |
253 | } | |
254 | ||
255 | /** | |
256 | * init_event_struct: Initialize fields in an event struct that are always | |
257 | * required. | |
258 | * @evt: The event | |
259 | * @done: Routine to call when the event is responded to | |
260 | * @format: SRP or MAD format | |
261 | * @timeout: timeout value set in the CRQ | |
262 | */ | |
263 | static void init_event_struct(struct srp_event_struct *evt_struct, | |
264 | void (*done) (struct srp_event_struct *), | |
265 | u8 format, | |
266 | int timeout) | |
267 | { | |
268 | evt_struct->cmnd = NULL; | |
269 | evt_struct->cmnd_done = NULL; | |
270 | evt_struct->sync_srp = NULL; | |
271 | evt_struct->crq.format = format; | |
272 | evt_struct->crq.timeout = timeout; | |
273 | evt_struct->done = done; | |
274 | } | |
275 | ||
276 | /* ------------------------------------------------------------ | |
277 | * Routines for receiving SCSI responses from the hosting partition | |
278 | */ | |
279 | ||
280 | /** | |
281 | * set_srp_direction: Set the fields in the srp related to data | |
282 | * direction and number of buffers based on the direction in | |
283 | * the scsi_cmnd and the number of buffers | |
284 | */ | |
285 | static void set_srp_direction(struct scsi_cmnd *cmd, | |
286 | struct srp_cmd *srp_cmd, | |
287 | int numbuf) | |
288 | { | |
ef265673 FT |
289 | u8 fmt; |
290 | ||
1da177e4 LT |
291 | if (numbuf == 0) |
292 | return; | |
293 | ||
ef265673 FT |
294 | if (numbuf == 1) |
295 | fmt = SRP_DATA_DESC_DIRECT; | |
296 | else { | |
297 | fmt = SRP_DATA_DESC_INDIRECT; | |
298 | numbuf = min(numbuf, MAX_INDIRECT_BUFS); | |
299 | ||
1da177e4 | 300 | if (cmd->sc_data_direction == DMA_TO_DEVICE) |
ef265673 FT |
301 | srp_cmd->data_out_desc_cnt = numbuf; |
302 | else | |
303 | srp_cmd->data_in_desc_cnt = numbuf; | |
1da177e4 | 304 | } |
ef265673 FT |
305 | |
306 | if (cmd->sc_data_direction == DMA_TO_DEVICE) | |
307 | srp_cmd->buf_fmt = fmt << 4; | |
308 | else | |
309 | srp_cmd->buf_fmt = fmt; | |
1da177e4 LT |
310 | } |
311 | ||
ef265673 | 312 | static void unmap_sg_list(int num_entries, |
4dddbc26 | 313 | struct device *dev, |
ef265673 FT |
314 | struct srp_direct_buf *md) |
315 | { | |
4dddbc26 JB |
316 | int i; |
317 | ||
ef265673 FT |
318 | for (i = 0; i < num_entries; ++i) |
319 | dma_unmap_single(dev, md[i].va, md[i].len, DMA_BIDIRECTIONAL); | |
4dddbc26 JB |
320 | } |
321 | ||
1da177e4 LT |
322 | /** |
323 | * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format | |
324 | * @cmd: srp_cmd whose additional_data member will be unmapped | |
325 | * @dev: device for which the memory is mapped | |
326 | * | |
327 | */ | |
4dddbc26 JB |
328 | static void unmap_cmd_data(struct srp_cmd *cmd, |
329 | struct srp_event_struct *evt_struct, | |
330 | struct device *dev) | |
1da177e4 | 331 | { |
ef265673 FT |
332 | u8 out_fmt, in_fmt; |
333 | ||
334 | out_fmt = cmd->buf_fmt >> 4; | |
335 | in_fmt = cmd->buf_fmt & ((1U << 4) - 1); | |
336 | ||
337 | if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC) | |
1da177e4 | 338 | return; |
ef265673 FT |
339 | else if (out_fmt == SRP_DATA_DESC_DIRECT || |
340 | in_fmt == SRP_DATA_DESC_DIRECT) { | |
341 | struct srp_direct_buf *data = | |
342 | (struct srp_direct_buf *) cmd->add_data; | |
343 | dma_unmap_single(dev, data->va, data->len, DMA_BIDIRECTIONAL); | |
1da177e4 | 344 | } else { |
ef265673 FT |
345 | struct srp_indirect_buf *indirect = |
346 | (struct srp_indirect_buf *) cmd->add_data; | |
347 | int num_mapped = indirect->table_desc.len / | |
348 | sizeof(struct srp_direct_buf); | |
4dddbc26 JB |
349 | |
350 | if (num_mapped <= MAX_INDIRECT_BUFS) { | |
ef265673 | 351 | unmap_sg_list(num_mapped, dev, &indirect->desc_list[0]); |
4dddbc26 | 352 | return; |
1da177e4 | 353 | } |
4dddbc26 JB |
354 | |
355 | unmap_sg_list(num_mapped, dev, evt_struct->ext_list); | |
1da177e4 LT |
356 | } |
357 | } | |
358 | ||
9413d7b8 | 359 | static int map_sg_list(struct scsi_cmnd *cmd, int nseg, |
ef265673 | 360 | struct srp_direct_buf *md) |
4dddbc26 JB |
361 | { |
362 | int i; | |
9413d7b8 | 363 | struct scatterlist *sg; |
4dddbc26 JB |
364 | u64 total_length = 0; |
365 | ||
9413d7b8 | 366 | scsi_for_each_sg(cmd, sg, nseg, i) { |
ef265673 | 367 | struct srp_direct_buf *descr = md + i; |
9413d7b8 FT |
368 | descr->va = sg_dma_address(sg); |
369 | descr->len = sg_dma_len(sg); | |
ef265673 | 370 | descr->key = 0; |
9413d7b8 | 371 | total_length += sg_dma_len(sg); |
4dddbc26 JB |
372 | } |
373 | return total_length; | |
374 | } | |
375 | ||
1da177e4 LT |
376 | /** |
377 | * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields | |
378 | * @cmd: Scsi_Cmnd with the scatterlist | |
379 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
380 | * @dev: device for which to map dma memory | |
381 | * | |
382 | * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd. | |
383 | * Returns 1 on success. | |
384 | */ | |
385 | static int map_sg_data(struct scsi_cmnd *cmd, | |
4dddbc26 | 386 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
387 | struct srp_cmd *srp_cmd, struct device *dev) |
388 | { | |
389 | ||
4dddbc26 | 390 | int sg_mapped; |
1da177e4 | 391 | u64 total_length = 0; |
ef265673 FT |
392 | struct srp_direct_buf *data = |
393 | (struct srp_direct_buf *) srp_cmd->add_data; | |
394 | struct srp_indirect_buf *indirect = | |
395 | (struct srp_indirect_buf *) data; | |
1da177e4 | 396 | |
9413d7b8 FT |
397 | sg_mapped = scsi_dma_map(cmd); |
398 | if (!sg_mapped) | |
399 | return 1; | |
400 | else if (sg_mapped < 0) | |
1da177e4 LT |
401 | return 0; |
402 | ||
403 | set_srp_direction(cmd, srp_cmd, sg_mapped); | |
404 | ||
405 | /* special case; we can use a single direct descriptor */ | |
406 | if (sg_mapped == 1) { | |
9413d7b8 | 407 | map_sg_list(cmd, sg_mapped, data); |
1da177e4 LT |
408 | return 1; |
409 | } | |
410 | ||
ef265673 FT |
411 | indirect->table_desc.va = 0; |
412 | indirect->table_desc.len = sg_mapped * sizeof(struct srp_direct_buf); | |
413 | indirect->table_desc.key = 0; | |
4dddbc26 JB |
414 | |
415 | if (sg_mapped <= MAX_INDIRECT_BUFS) { | |
9413d7b8 | 416 | total_length = map_sg_list(cmd, sg_mapped, |
ef265673 FT |
417 | &indirect->desc_list[0]); |
418 | indirect->len = total_length; | |
4dddbc26 | 419 | return 1; |
1da177e4 | 420 | } |
1da177e4 | 421 | |
4dddbc26 JB |
422 | /* get indirect table */ |
423 | if (!evt_struct->ext_list) { | |
ef265673 | 424 | evt_struct->ext_list = (struct srp_direct_buf *) |
9413d7b8 | 425 | dma_alloc_coherent(dev, |
ef265673 FT |
426 | SG_ALL * sizeof(struct srp_direct_buf), |
427 | &evt_struct->ext_list_token, 0); | |
4dddbc26 | 428 | if (!evt_struct->ext_list) { |
6c0a60ec BK |
429 | sdev_printk(KERN_ERR, cmd->device, |
430 | "Can't allocate memory for indirect table\n"); | |
4dddbc26 | 431 | return 0; |
4dddbc26 JB |
432 | } |
433 | } | |
434 | ||
9413d7b8 | 435 | total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list); |
4dddbc26 | 436 | |
ef265673 FT |
437 | indirect->len = total_length; |
438 | indirect->table_desc.va = evt_struct->ext_list_token; | |
439 | indirect->table_desc.len = sg_mapped * sizeof(indirect->desc_list[0]); | |
440 | memcpy(indirect->desc_list, evt_struct->ext_list, | |
441 | MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf)); | |
4dddbc26 | 442 | return 1; |
1da177e4 LT |
443 | } |
444 | ||
1da177e4 LT |
445 | /** |
446 | * map_data_for_srp_cmd: - Calls functions to map data for srp cmds | |
447 | * @cmd: struct scsi_cmnd with the memory to be mapped | |
448 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
449 | * @dev: dma device for which to map dma memory | |
450 | * | |
451 | * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds | |
452 | * Returns 1 on success. | |
453 | */ | |
454 | static int map_data_for_srp_cmd(struct scsi_cmnd *cmd, | |
4dddbc26 | 455 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
456 | struct srp_cmd *srp_cmd, struct device *dev) |
457 | { | |
458 | switch (cmd->sc_data_direction) { | |
459 | case DMA_FROM_DEVICE: | |
460 | case DMA_TO_DEVICE: | |
461 | break; | |
462 | case DMA_NONE: | |
463 | return 1; | |
464 | case DMA_BIDIRECTIONAL: | |
6c0a60ec BK |
465 | sdev_printk(KERN_ERR, cmd->device, |
466 | "Can't map DMA_BIDIRECTIONAL to read/write\n"); | |
1da177e4 LT |
467 | return 0; |
468 | default: | |
6c0a60ec BK |
469 | sdev_printk(KERN_ERR, cmd->device, |
470 | "Unknown data direction 0x%02x; can't map!\n", | |
471 | cmd->sc_data_direction); | |
1da177e4 LT |
472 | return 0; |
473 | } | |
474 | ||
9413d7b8 | 475 | return map_sg_data(cmd, evt_struct, srp_cmd, dev); |
1da177e4 LT |
476 | } |
477 | ||
3d0e91f7 BK |
478 | /** |
479 | * purge_requests: Our virtual adapter just shut down. purge any sent requests | |
480 | * @hostdata: the adapter | |
481 | */ | |
482 | static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code) | |
483 | { | |
484 | struct srp_event_struct *tmp_evt, *pos; | |
485 | unsigned long flags; | |
486 | ||
487 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
488 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { | |
489 | list_del(&tmp_evt->list); | |
490 | del_timer(&tmp_evt->timer); | |
491 | if (tmp_evt->cmnd) { | |
492 | tmp_evt->cmnd->result = (error_code << 16); | |
493 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, | |
494 | tmp_evt, | |
495 | tmp_evt->hostdata->dev); | |
496 | if (tmp_evt->cmnd_done) | |
497 | tmp_evt->cmnd_done(tmp_evt->cmnd); | |
498 | } else if (tmp_evt->done) | |
499 | tmp_evt->done(tmp_evt); | |
500 | free_event_struct(&tmp_evt->hostdata->pool, tmp_evt); | |
501 | } | |
502 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
503 | } | |
504 | ||
505 | /** | |
506 | * ibmvscsi_reset_host - Reset the connection to the server | |
507 | * @hostdata: struct ibmvscsi_host_data to reset | |
508 | */ | |
509 | static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata) | |
510 | { | |
511 | scsi_block_requests(hostdata->host); | |
512 | atomic_set(&hostdata->request_limit, 0); | |
513 | ||
514 | purge_requests(hostdata, DID_ERROR); | |
d3849d51 DW |
515 | if ((ibmvscsi_ops->reset_crq_queue(&hostdata->queue, hostdata)) || |
516 | (ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0)) || | |
3d0e91f7 BK |
517 | (vio_enable_interrupts(to_vio_dev(hostdata->dev)))) { |
518 | atomic_set(&hostdata->request_limit, -1); | |
519 | dev_err(hostdata->dev, "error after reset\n"); | |
520 | } | |
521 | ||
522 | scsi_unblock_requests(hostdata->host); | |
523 | } | |
524 | ||
525 | /** | |
526 | * ibmvscsi_timeout - Internal command timeout handler | |
527 | * @evt_struct: struct srp_event_struct that timed out | |
528 | * | |
529 | * Called when an internally generated command times out | |
530 | */ | |
531 | static void ibmvscsi_timeout(struct srp_event_struct *evt_struct) | |
532 | { | |
533 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
534 | ||
535 | dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n", | |
536 | evt_struct->iu.srp.cmd.opcode); | |
537 | ||
538 | ibmvscsi_reset_host(hostdata); | |
539 | } | |
540 | ||
541 | ||
1da177e4 LT |
542 | /* ------------------------------------------------------------ |
543 | * Routines for sending and receiving SRPs | |
544 | */ | |
545 | /** | |
546 | * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq() | |
547 | * @evt_struct: evt_struct to be sent | |
548 | * @hostdata: ibmvscsi_host_data of host | |
3d0e91f7 | 549 | * @timeout: timeout in seconds - 0 means do not time command |
1da177e4 LT |
550 | * |
551 | * Returns the value returned from ibmvscsi_send_crq(). (Zero for success) | |
552 | * Note that this routine assumes that host_lock is held for synchronization | |
553 | */ | |
554 | static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct, | |
3d0e91f7 BK |
555 | struct ibmvscsi_host_data *hostdata, |
556 | unsigned long timeout) | |
1da177e4 | 557 | { |
1da177e4 | 558 | u64 *crq_as_u64 = (u64 *) &evt_struct->crq; |
cefbda2d | 559 | int request_status; |
1da177e4 LT |
560 | int rc; |
561 | ||
a897ff2a RJ |
562 | /* If we have exhausted our request limit, just fail this request, |
563 | * unless it is for a reset or abort. | |
1da177e4 LT |
564 | * Note that there are rare cases involving driver generated requests |
565 | * (such as task management requests) that the mid layer may think we | |
566 | * can handle more requests (can_queue) when we actually can't | |
567 | */ | |
cefbda2d DB |
568 | if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) { |
569 | request_status = | |
570 | atomic_dec_if_positive(&hostdata->request_limit); | |
571 | /* If request limit was -1 when we started, it is now even | |
572 | * less than that | |
573 | */ | |
574 | if (request_status < -1) | |
575 | goto send_error; | |
a897ff2a RJ |
576 | /* Otherwise, we may have run out of requests. */ |
577 | /* Abort and reset calls should make it through. | |
578 | * Nothing except abort and reset should use the last two | |
579 | * slots unless we had two or less to begin with. | |
580 | */ | |
581 | else if (request_status < 2 && | |
582 | evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) { | |
583 | /* In the case that we have less than two requests | |
584 | * available, check the server limit as a combination | |
585 | * of the request limit and the number of requests | |
586 | * in-flight (the size of the send list). If the | |
587 | * server limit is greater than 2, return busy so | |
588 | * that the last two are reserved for reset and abort. | |
589 | */ | |
590 | int server_limit = request_status; | |
591 | struct srp_event_struct *tmp_evt; | |
592 | ||
593 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
594 | server_limit++; | |
595 | } | |
596 | ||
597 | if (server_limit > 2) | |
598 | goto send_busy; | |
599 | } | |
cefbda2d | 600 | } |
1da177e4 LT |
601 | |
602 | /* Copy the IU into the transfer area */ | |
603 | *evt_struct->xfer_iu = evt_struct->iu; | |
ef265673 | 604 | evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct; |
1da177e4 LT |
605 | |
606 | /* Add this to the sent list. We need to do this | |
607 | * before we actually send | |
608 | * in case it comes back REALLY fast | |
609 | */ | |
610 | list_add_tail(&evt_struct->list, &hostdata->sent); | |
611 | ||
3d0e91f7 BK |
612 | init_timer(&evt_struct->timer); |
613 | if (timeout) { | |
614 | evt_struct->timer.data = (unsigned long) evt_struct; | |
615 | evt_struct->timer.expires = jiffies + (timeout * HZ); | |
616 | evt_struct->timer.function = (void (*)(unsigned long))ibmvscsi_timeout; | |
617 | add_timer(&evt_struct->timer); | |
618 | } | |
619 | ||
1da177e4 | 620 | if ((rc = |
d3849d51 | 621 | ibmvscsi_ops->send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) { |
1da177e4 | 622 | list_del(&evt_struct->list); |
3d0e91f7 | 623 | del_timer(&evt_struct->timer); |
1da177e4 | 624 | |
6c0a60ec | 625 | dev_err(hostdata->dev, "send error %d\n", rc); |
a897ff2a | 626 | atomic_inc(&hostdata->request_limit); |
1da177e4 LT |
627 | goto send_error; |
628 | } | |
629 | ||
630 | return 0; | |
631 | ||
cefbda2d | 632 | send_busy: |
4dddbc26 | 633 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); |
1da177e4 | 634 | |
1da177e4 | 635 | free_event_struct(&hostdata->pool, evt_struct); |
a897ff2a RJ |
636 | atomic_inc(&hostdata->request_limit); |
637 | return SCSI_MLQUEUE_HOST_BUSY; | |
cefbda2d DB |
638 | |
639 | send_error: | |
640 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); | |
641 | ||
642 | if (evt_struct->cmnd != NULL) { | |
643 | evt_struct->cmnd->result = DID_ERROR << 16; | |
644 | evt_struct->cmnd_done(evt_struct->cmnd); | |
645 | } else if (evt_struct->done) | |
646 | evt_struct->done(evt_struct); | |
647 | ||
648 | free_event_struct(&hostdata->pool, evt_struct); | |
649 | return 0; | |
1da177e4 LT |
650 | } |
651 | ||
652 | /** | |
653 | * handle_cmd_rsp: - Handle responses from commands | |
654 | * @evt_struct: srp_event_struct to be handled | |
655 | * | |
656 | * Used as a callback by when sending scsi cmds. | |
657 | * Gets called by ibmvscsi_handle_crq() | |
658 | */ | |
659 | static void handle_cmd_rsp(struct srp_event_struct *evt_struct) | |
660 | { | |
661 | struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp; | |
662 | struct scsi_cmnd *cmnd = evt_struct->cmnd; | |
663 | ||
ef265673 | 664 | if (unlikely(rsp->opcode != SRP_RSP)) { |
1da177e4 | 665 | if (printk_ratelimit()) |
6c0a60ec BK |
666 | dev_warn(evt_struct->hostdata->dev, |
667 | "bad SRP RSP type %d\n", rsp->opcode); | |
1da177e4 LT |
668 | } |
669 | ||
670 | if (cmnd) { | |
671 | cmnd->result = rsp->status; | |
672 | if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION) | |
673 | memcpy(cmnd->sense_buffer, | |
ef265673 FT |
674 | rsp->data, |
675 | rsp->sense_data_len); | |
1da177e4 | 676 | unmap_cmd_data(&evt_struct->iu.srp.cmd, |
4dddbc26 | 677 | evt_struct, |
1da177e4 LT |
678 | evt_struct->hostdata->dev); |
679 | ||
ef265673 | 680 | if (rsp->flags & SRP_RSP_FLAG_DOOVER) |
9413d7b8 | 681 | scsi_set_resid(cmnd, rsp->data_out_res_cnt); |
ef265673 | 682 | else if (rsp->flags & SRP_RSP_FLAG_DIOVER) |
9413d7b8 | 683 | scsi_set_resid(cmnd, rsp->data_in_res_cnt); |
1da177e4 LT |
684 | } |
685 | ||
686 | if (evt_struct->cmnd_done) | |
687 | evt_struct->cmnd_done(cmnd); | |
688 | } | |
689 | ||
690 | /** | |
691 | * lun_from_dev: - Returns the lun of the scsi device | |
692 | * @dev: struct scsi_device | |
693 | * | |
694 | */ | |
695 | static inline u16 lun_from_dev(struct scsi_device *dev) | |
696 | { | |
697 | return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun; | |
698 | } | |
699 | ||
700 | /** | |
701 | * ibmvscsi_queue: - The queuecommand function of the scsi template | |
702 | * @cmd: struct scsi_cmnd to be executed | |
703 | * @done: Callback function to be called when cmd is completed | |
704 | */ | |
705 | static int ibmvscsi_queuecommand(struct scsi_cmnd *cmnd, | |
706 | void (*done) (struct scsi_cmnd *)) | |
707 | { | |
708 | struct srp_cmd *srp_cmd; | |
709 | struct srp_event_struct *evt_struct; | |
ef265673 | 710 | struct srp_indirect_buf *indirect; |
7603e02e | 711 | struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host); |
1da177e4 | 712 | u16 lun = lun_from_dev(cmnd->device); |
ef265673 | 713 | u8 out_fmt, in_fmt; |
1da177e4 LT |
714 | |
715 | evt_struct = get_event_struct(&hostdata->pool); | |
716 | if (!evt_struct) | |
717 | return SCSI_MLQUEUE_HOST_BUSY; | |
718 | ||
1da177e4 LT |
719 | /* Set up the actual SRP IU */ |
720 | srp_cmd = &evt_struct->iu.srp.cmd; | |
ef265673 FT |
721 | memset(srp_cmd, 0x00, SRP_MAX_IU_LEN); |
722 | srp_cmd->opcode = SRP_CMD; | |
1da177e4 LT |
723 | memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(cmnd->cmnd)); |
724 | srp_cmd->lun = ((u64) lun) << 48; | |
725 | ||
4dddbc26 | 726 | if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) { |
6c0a60ec | 727 | sdev_printk(KERN_ERR, cmnd->device, "couldn't convert cmd to srp_cmd\n"); |
1da177e4 LT |
728 | free_event_struct(&hostdata->pool, evt_struct); |
729 | return SCSI_MLQUEUE_HOST_BUSY; | |
730 | } | |
731 | ||
4dddbc26 JB |
732 | init_event_struct(evt_struct, |
733 | handle_cmd_rsp, | |
734 | VIOSRP_SRP_FORMAT, | |
735 | cmnd->timeout_per_command/HZ); | |
736 | ||
737 | evt_struct->cmnd = cmnd; | |
738 | evt_struct->cmnd_done = done; | |
739 | ||
1da177e4 | 740 | /* Fix up dma address of the buffer itself */ |
ef265673 FT |
741 | indirect = (struct srp_indirect_buf *) srp_cmd->add_data; |
742 | out_fmt = srp_cmd->buf_fmt >> 4; | |
743 | in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1); | |
744 | if ((in_fmt == SRP_DATA_DESC_INDIRECT || | |
745 | out_fmt == SRP_DATA_DESC_INDIRECT) && | |
746 | indirect->table_desc.va == 0) { | |
747 | indirect->table_desc.va = evt_struct->crq.IU_data_ptr + | |
748 | offsetof(struct srp_cmd, add_data) + | |
749 | offsetof(struct srp_indirect_buf, desc_list); | |
1da177e4 LT |
750 | } |
751 | ||
3d0e91f7 | 752 | return ibmvscsi_send_srp_event(evt_struct, hostdata, 0); |
1da177e4 LT |
753 | } |
754 | ||
755 | /* ------------------------------------------------------------ | |
756 | * Routines for driver initialization | |
757 | */ | |
758 | /** | |
759 | * adapter_info_rsp: - Handle response to MAD adapter info request | |
760 | * @evt_struct: srp_event_struct with the response | |
761 | * | |
762 | * Used as a "done" callback by when sending adapter_info. Gets called | |
763 | * by ibmvscsi_handle_crq() | |
764 | */ | |
765 | static void adapter_info_rsp(struct srp_event_struct *evt_struct) | |
766 | { | |
767 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
768 | dma_unmap_single(hostdata->dev, | |
769 | evt_struct->iu.mad.adapter_info.buffer, | |
770 | evt_struct->iu.mad.adapter_info.common.length, | |
771 | DMA_BIDIRECTIONAL); | |
772 | ||
773 | if (evt_struct->xfer_iu->mad.adapter_info.common.status) { | |
6c0a60ec BK |
774 | dev_err(hostdata->dev, "error %d getting adapter info\n", |
775 | evt_struct->xfer_iu->mad.adapter_info.common.status); | |
1da177e4 | 776 | } else { |
6c0a60ec BK |
777 | dev_info(hostdata->dev, "host srp version: %s, " |
778 | "host partition %s (%d), OS %d, max io %u\n", | |
779 | hostdata->madapter_info.srp_version, | |
780 | hostdata->madapter_info.partition_name, | |
781 | hostdata->madapter_info.partition_number, | |
782 | hostdata->madapter_info.os_type, | |
783 | hostdata->madapter_info.port_max_txu[0]); | |
1da177e4 LT |
784 | |
785 | if (hostdata->madapter_info.port_max_txu[0]) | |
786 | hostdata->host->max_sectors = | |
787 | hostdata->madapter_info.port_max_txu[0] >> 9; | |
154fb614 DB |
788 | |
789 | if (hostdata->madapter_info.os_type == 3 && | |
790 | strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) { | |
6c0a60ec BK |
791 | dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n", |
792 | hostdata->madapter_info.srp_version); | |
793 | dev_err(hostdata->dev, "limiting scatterlists to %d\n", | |
794 | MAX_INDIRECT_BUFS); | |
154fb614 DB |
795 | hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS; |
796 | } | |
1da177e4 LT |
797 | } |
798 | } | |
799 | ||
800 | /** | |
801 | * send_mad_adapter_info: - Sends the mad adapter info request | |
802 | * and stores the result so it can be retrieved with | |
803 | * sysfs. We COULD consider causing a failure if the | |
804 | * returned SRP version doesn't match ours. | |
805 | * @hostdata: ibmvscsi_host_data of host | |
806 | * | |
807 | * Returns zero if successful. | |
808 | */ | |
809 | static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata) | |
810 | { | |
811 | struct viosrp_adapter_info *req; | |
812 | struct srp_event_struct *evt_struct; | |
06f923cb | 813 | unsigned long flags; |
e5dbfa66 FT |
814 | dma_addr_t addr; |
815 | ||
1da177e4 LT |
816 | evt_struct = get_event_struct(&hostdata->pool); |
817 | if (!evt_struct) { | |
6c0a60ec BK |
818 | dev_err(hostdata->dev, |
819 | "couldn't allocate an event for ADAPTER_INFO_REQ!\n"); | |
1da177e4 LT |
820 | return; |
821 | } | |
822 | ||
823 | init_event_struct(evt_struct, | |
824 | adapter_info_rsp, | |
825 | VIOSRP_MAD_FORMAT, | |
33874a00 | 826 | init_timeout); |
1da177e4 LT |
827 | |
828 | req = &evt_struct->iu.mad.adapter_info; | |
829 | memset(req, 0x00, sizeof(*req)); | |
830 | ||
831 | req->common.type = VIOSRP_ADAPTER_INFO_TYPE; | |
832 | req->common.length = sizeof(hostdata->madapter_info); | |
e5dbfa66 FT |
833 | req->buffer = addr = dma_map_single(hostdata->dev, |
834 | &hostdata->madapter_info, | |
835 | sizeof(hostdata->madapter_info), | |
836 | DMA_BIDIRECTIONAL); | |
1da177e4 LT |
837 | |
838 | if (dma_mapping_error(req->buffer)) { | |
6c0a60ec | 839 | dev_err(hostdata->dev, "Unable to map request_buffer for adapter_info!\n"); |
1da177e4 LT |
840 | free_event_struct(&hostdata->pool, evt_struct); |
841 | return; | |
842 | } | |
843 | ||
06f923cb | 844 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
3d0e91f7 | 845 | if (ibmvscsi_send_srp_event(evt_struct, hostdata, init_timeout * 2)) { |
6c0a60ec | 846 | dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n"); |
e5dbfa66 FT |
847 | dma_unmap_single(hostdata->dev, |
848 | addr, | |
849 | sizeof(hostdata->madapter_info), | |
850 | DMA_BIDIRECTIONAL); | |
851 | } | |
06f923cb | 852 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
853 | }; |
854 | ||
855 | /** | |
856 | * login_rsp: - Handle response to SRP login request | |
857 | * @evt_struct: srp_event_struct with the response | |
858 | * | |
859 | * Used as a "done" callback by when sending srp_login. Gets called | |
860 | * by ibmvscsi_handle_crq() | |
861 | */ | |
862 | static void login_rsp(struct srp_event_struct *evt_struct) | |
863 | { | |
864 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
ef265673 FT |
865 | switch (evt_struct->xfer_iu->srp.login_rsp.opcode) { |
866 | case SRP_LOGIN_RSP: /* it worked! */ | |
1da177e4 | 867 | break; |
ef265673 | 868 | case SRP_LOGIN_REJ: /* refused! */ |
6c0a60ec BK |
869 | dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n", |
870 | evt_struct->xfer_iu->srp.login_rej.reason); | |
1da177e4 LT |
871 | /* Login failed. */ |
872 | atomic_set(&hostdata->request_limit, -1); | |
873 | return; | |
874 | default: | |
6c0a60ec BK |
875 | dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n", |
876 | evt_struct->xfer_iu->srp.login_rsp.opcode); | |
1da177e4 LT |
877 | /* Login failed. */ |
878 | atomic_set(&hostdata->request_limit, -1); | |
879 | return; | |
880 | } | |
881 | ||
6c0a60ec | 882 | dev_info(hostdata->dev, "SRP_LOGIN succeeded\n"); |
1da177e4 | 883 | |
a897ff2a | 884 | if (evt_struct->xfer_iu->srp.login_rsp.req_lim_delta < 0) |
6c0a60ec | 885 | dev_err(hostdata->dev, "Invalid request_limit.\n"); |
1da177e4 | 886 | |
a897ff2a RJ |
887 | /* Now we know what the real request-limit is. |
888 | * This value is set rather than added to request_limit because | |
889 | * request_limit could have been set to -1 by this client. | |
890 | */ | |
1da177e4 | 891 | atomic_set(&hostdata->request_limit, |
ef265673 | 892 | evt_struct->xfer_iu->srp.login_rsp.req_lim_delta); |
1da177e4 | 893 | |
2b541f8f DB |
894 | /* If we had any pending I/Os, kick them */ |
895 | scsi_unblock_requests(hostdata->host); | |
896 | ||
1da177e4 LT |
897 | send_mad_adapter_info(hostdata); |
898 | return; | |
899 | } | |
900 | ||
901 | /** | |
902 | * send_srp_login: - Sends the srp login | |
903 | * @hostdata: ibmvscsi_host_data of host | |
904 | * | |
905 | * Returns zero if successful. | |
906 | */ | |
907 | static int send_srp_login(struct ibmvscsi_host_data *hostdata) | |
908 | { | |
909 | int rc; | |
910 | unsigned long flags; | |
911 | struct srp_login_req *login; | |
912 | struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool); | |
913 | if (!evt_struct) { | |
6c0a60ec | 914 | dev_err(hostdata->dev, "couldn't allocate an event for login req!\n"); |
1da177e4 LT |
915 | return FAILED; |
916 | } | |
917 | ||
918 | init_event_struct(evt_struct, | |
919 | login_rsp, | |
920 | VIOSRP_SRP_FORMAT, | |
33874a00 | 921 | init_timeout); |
1da177e4 LT |
922 | |
923 | login = &evt_struct->iu.srp.login_req; | |
2b541f8f | 924 | memset(login, 0x00, sizeof(struct srp_login_req)); |
ef265673 FT |
925 | login->opcode = SRP_LOGIN_REQ; |
926 | login->req_it_iu_len = sizeof(union srp_iu); | |
927 | login->req_buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT; | |
1da177e4 | 928 | |
9b833e42 | 929 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
930 | /* Start out with a request limit of 1, since this is negotiated in |
931 | * the login request we are just sending | |
932 | */ | |
933 | atomic_set(&hostdata->request_limit, 1); | |
934 | ||
3d0e91f7 | 935 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, init_timeout * 2); |
1da177e4 | 936 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
6c0a60ec | 937 | dev_info(hostdata->dev, "sent SRP login\n"); |
1da177e4 LT |
938 | return rc; |
939 | }; | |
940 | ||
941 | /** | |
942 | * sync_completion: Signal that a synchronous command has completed | |
943 | * Note that after returning from this call, the evt_struct is freed. | |
944 | * the caller waiting on this completion shouldn't touch the evt_struct | |
945 | * again. | |
946 | */ | |
947 | static void sync_completion(struct srp_event_struct *evt_struct) | |
948 | { | |
949 | /* copy the response back */ | |
950 | if (evt_struct->sync_srp) | |
951 | *evt_struct->sync_srp = *evt_struct->xfer_iu; | |
952 | ||
953 | complete(&evt_struct->comp); | |
954 | } | |
955 | ||
956 | /** | |
957 | * ibmvscsi_abort: Abort a command...from scsi host template | |
958 | * send this over to the server and wait synchronously for the response | |
959 | */ | |
960 | static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd) | |
961 | { | |
7603e02e | 962 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 LT |
963 | struct srp_tsk_mgmt *tsk_mgmt; |
964 | struct srp_event_struct *evt; | |
965 | struct srp_event_struct *tmp_evt, *found_evt; | |
966 | union viosrp_iu srp_rsp; | |
967 | int rsp_rc; | |
be042f24 | 968 | unsigned long flags; |
1da177e4 LT |
969 | u16 lun = lun_from_dev(cmd->device); |
970 | ||
971 | /* First, find this command in our sent list so we can figure | |
972 | * out the correct tag | |
973 | */ | |
be042f24 | 974 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
975 | found_evt = NULL; |
976 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
977 | if (tmp_evt->cmnd == cmd) { | |
978 | found_evt = tmp_evt; | |
979 | break; | |
980 | } | |
981 | } | |
982 | ||
be042f24 DB |
983 | if (!found_evt) { |
984 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
35f51eee | 985 | return SUCCESS; |
be042f24 | 986 | } |
1da177e4 LT |
987 | |
988 | evt = get_event_struct(&hostdata->pool); | |
989 | if (evt == NULL) { | |
be042f24 | 990 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
6c0a60ec | 991 | sdev_printk(KERN_ERR, cmd->device, "failed to allocate abort event\n"); |
1da177e4 LT |
992 | return FAILED; |
993 | } | |
994 | ||
995 | init_event_struct(evt, | |
996 | sync_completion, | |
997 | VIOSRP_SRP_FORMAT, | |
33874a00 | 998 | init_timeout); |
1da177e4 LT |
999 | |
1000 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; | |
1001 | ||
1002 | /* Set up an abort SRP command */ | |
1003 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
ef265673 | 1004 | tsk_mgmt->opcode = SRP_TSK_MGMT; |
1da177e4 | 1005 | tsk_mgmt->lun = ((u64) lun) << 48; |
ef265673 FT |
1006 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK; |
1007 | tsk_mgmt->task_tag = (u64) found_evt; | |
1da177e4 | 1008 | |
6c0a60ec BK |
1009 | sdev_printk(KERN_INFO, cmd->device, "aborting command. lun 0x%lx, tag 0x%lx\n", |
1010 | tsk_mgmt->lun, tsk_mgmt->task_tag); | |
1da177e4 LT |
1011 | |
1012 | evt->sync_srp = &srp_rsp; | |
1013 | init_completion(&evt->comp); | |
3d0e91f7 | 1014 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, init_timeout * 2); |
be042f24 DB |
1015 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1016 | if (rsp_rc != 0) { | |
6c0a60ec BK |
1017 | sdev_printk(KERN_ERR, cmd->device, |
1018 | "failed to send abort() event. rc=%d\n", rsp_rc); | |
1da177e4 LT |
1019 | return FAILED; |
1020 | } | |
1021 | ||
1da177e4 | 1022 | wait_for_completion(&evt->comp); |
1da177e4 LT |
1023 | |
1024 | /* make sure we got a good response */ | |
ef265673 | 1025 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 | 1026 | if (printk_ratelimit()) |
6c0a60ec BK |
1027 | sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n", |
1028 | srp_rsp.srp.rsp.opcode); | |
1da177e4 LT |
1029 | return FAILED; |
1030 | } | |
1031 | ||
ef265673 FT |
1032 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1033 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1034 | else |
1035 | rsp_rc = srp_rsp.srp.rsp.status; | |
1036 | ||
1037 | if (rsp_rc) { | |
1038 | if (printk_ratelimit()) | |
6c0a60ec BK |
1039 | sdev_printk(KERN_WARNING, cmd->device, |
1040 | "abort code %d for task tag 0x%lx\n", | |
1041 | rsp_rc, tsk_mgmt->task_tag); | |
1da177e4 LT |
1042 | return FAILED; |
1043 | } | |
1044 | ||
1045 | /* Because we dropped the spinlock above, it's possible | |
1046 | * The event is no longer in our list. Make sure it didn't | |
1047 | * complete while we were aborting | |
1048 | */ | |
be042f24 | 1049 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1050 | found_evt = NULL; |
1051 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
1052 | if (tmp_evt->cmnd == cmd) { | |
1053 | found_evt = tmp_evt; | |
1054 | break; | |
1055 | } | |
1056 | } | |
1057 | ||
1058 | if (found_evt == NULL) { | |
be042f24 | 1059 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
6c0a60ec BK |
1060 | sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%lx completed\n", |
1061 | tsk_mgmt->task_tag); | |
1da177e4 LT |
1062 | return SUCCESS; |
1063 | } | |
1064 | ||
6c0a60ec BK |
1065 | sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%lx\n", |
1066 | tsk_mgmt->task_tag); | |
1da177e4 LT |
1067 | |
1068 | cmd->result = (DID_ABORT << 16); | |
1069 | list_del(&found_evt->list); | |
4dddbc26 JB |
1070 | unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt, |
1071 | found_evt->hostdata->dev); | |
1da177e4 | 1072 | free_event_struct(&found_evt->hostdata->pool, found_evt); |
be042f24 | 1073 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1074 | atomic_inc(&hostdata->request_limit); |
1075 | return SUCCESS; | |
1076 | } | |
1077 | ||
1078 | /** | |
1079 | * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host | |
1080 | * template send this over to the server and wait synchronously for the | |
1081 | * response | |
1082 | */ | |
1083 | static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd) | |
1084 | { | |
7603e02e | 1085 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 LT |
1086 | struct srp_tsk_mgmt *tsk_mgmt; |
1087 | struct srp_event_struct *evt; | |
1088 | struct srp_event_struct *tmp_evt, *pos; | |
1089 | union viosrp_iu srp_rsp; | |
1090 | int rsp_rc; | |
be042f24 | 1091 | unsigned long flags; |
1da177e4 LT |
1092 | u16 lun = lun_from_dev(cmd->device); |
1093 | ||
be042f24 | 1094 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1095 | evt = get_event_struct(&hostdata->pool); |
1096 | if (evt == NULL) { | |
be042f24 | 1097 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
6c0a60ec | 1098 | sdev_printk(KERN_ERR, cmd->device, "failed to allocate reset event\n"); |
1da177e4 LT |
1099 | return FAILED; |
1100 | } | |
1101 | ||
1102 | init_event_struct(evt, | |
1103 | sync_completion, | |
1104 | VIOSRP_SRP_FORMAT, | |
33874a00 | 1105 | init_timeout); |
1da177e4 LT |
1106 | |
1107 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; | |
1108 | ||
1109 | /* Set up a lun reset SRP command */ | |
1110 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
ef265673 | 1111 | tsk_mgmt->opcode = SRP_TSK_MGMT; |
1da177e4 | 1112 | tsk_mgmt->lun = ((u64) lun) << 48; |
ef265673 | 1113 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET; |
1da177e4 | 1114 | |
6c0a60ec BK |
1115 | sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%lx\n", |
1116 | tsk_mgmt->lun); | |
1da177e4 LT |
1117 | |
1118 | evt->sync_srp = &srp_rsp; | |
1119 | init_completion(&evt->comp); | |
3d0e91f7 | 1120 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, init_timeout * 2); |
be042f24 DB |
1121 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1122 | if (rsp_rc != 0) { | |
6c0a60ec BK |
1123 | sdev_printk(KERN_ERR, cmd->device, |
1124 | "failed to send reset event. rc=%d\n", rsp_rc); | |
1da177e4 LT |
1125 | return FAILED; |
1126 | } | |
1127 | ||
1da177e4 | 1128 | wait_for_completion(&evt->comp); |
1da177e4 LT |
1129 | |
1130 | /* make sure we got a good response */ | |
ef265673 | 1131 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 | 1132 | if (printk_ratelimit()) |
6c0a60ec BK |
1133 | sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n", |
1134 | srp_rsp.srp.rsp.opcode); | |
1da177e4 LT |
1135 | return FAILED; |
1136 | } | |
1137 | ||
ef265673 FT |
1138 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1139 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1140 | else |
1141 | rsp_rc = srp_rsp.srp.rsp.status; | |
1142 | ||
1143 | if (rsp_rc) { | |
1144 | if (printk_ratelimit()) | |
6c0a60ec BK |
1145 | sdev_printk(KERN_WARNING, cmd->device, |
1146 | "reset code %d for task tag 0x%lx\n", | |
1147 | rsp_rc, tsk_mgmt->task_tag); | |
1da177e4 LT |
1148 | return FAILED; |
1149 | } | |
1150 | ||
1151 | /* We need to find all commands for this LUN that have not yet been | |
1152 | * responded to, and fail them with DID_RESET | |
1153 | */ | |
be042f24 | 1154 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1155 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { |
1156 | if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) { | |
1157 | if (tmp_evt->cmnd) | |
1158 | tmp_evt->cmnd->result = (DID_RESET << 16); | |
1159 | list_del(&tmp_evt->list); | |
4dddbc26 JB |
1160 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt, |
1161 | tmp_evt->hostdata->dev); | |
1da177e4 LT |
1162 | free_event_struct(&tmp_evt->hostdata->pool, |
1163 | tmp_evt); | |
1164 | atomic_inc(&hostdata->request_limit); | |
1165 | if (tmp_evt->cmnd_done) | |
1166 | tmp_evt->cmnd_done(tmp_evt->cmnd); | |
1167 | else if (tmp_evt->done) | |
1168 | tmp_evt->done(tmp_evt); | |
1169 | } | |
1170 | } | |
be042f24 | 1171 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1172 | return SUCCESS; |
1173 | } | |
1174 | ||
1175 | /** | |
3d0e91f7 BK |
1176 | * ibmvscsi_eh_host_reset_handler - Reset the connection to the server |
1177 | * @cmd: struct scsi_cmnd having problems | |
1178 | */ | |
1179 | static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd) | |
1da177e4 | 1180 | { |
3d0e91f7 | 1181 | unsigned long wait_switch = 0; |
7603e02e | 1182 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 | 1183 | |
3d0e91f7 BK |
1184 | dev_err(hostdata->dev, "Resetting connection due to error recovery\n"); |
1185 | ||
1186 | ibmvscsi_reset_host(hostdata); | |
1187 | ||
1188 | for (wait_switch = jiffies + (init_timeout * HZ); | |
1189 | time_before(jiffies, wait_switch) && | |
1190 | atomic_read(&hostdata->request_limit) < 2;) { | |
1191 | ||
1192 | msleep(10); | |
1da177e4 | 1193 | } |
3d0e91f7 BK |
1194 | |
1195 | if (atomic_read(&hostdata->request_limit) <= 0) | |
1196 | return FAILED; | |
1197 | ||
1198 | return SUCCESS; | |
1da177e4 LT |
1199 | } |
1200 | ||
1201 | /** | |
1202 | * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ | |
1203 | * @crq: Command/Response queue | |
1204 | * @hostdata: ibmvscsi_host_data of host | |
1205 | * | |
1206 | */ | |
1207 | void ibmvscsi_handle_crq(struct viosrp_crq *crq, | |
1208 | struct ibmvscsi_host_data *hostdata) | |
1209 | { | |
6c0a60ec | 1210 | long rc; |
1da177e4 LT |
1211 | unsigned long flags; |
1212 | struct srp_event_struct *evt_struct = | |
1213 | (struct srp_event_struct *)crq->IU_data_ptr; | |
1214 | switch (crq->valid) { | |
1215 | case 0xC0: /* initialization */ | |
1216 | switch (crq->format) { | |
1217 | case 0x01: /* Initialization message */ | |
6c0a60ec | 1218 | dev_info(hostdata->dev, "partner initialized\n"); |
1da177e4 | 1219 | /* Send back a response */ |
d3849d51 DW |
1220 | if ((rc = ibmvscsi_ops->send_crq(hostdata, |
1221 | 0xC002000000000000LL, 0)) == 0) { | |
1da177e4 LT |
1222 | /* Now login */ |
1223 | send_srp_login(hostdata); | |
1224 | } else { | |
6c0a60ec | 1225 | dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc); |
1da177e4 LT |
1226 | } |
1227 | ||
1228 | break; | |
1229 | case 0x02: /* Initialization response */ | |
6c0a60ec | 1230 | dev_info(hostdata->dev, "partner initialization complete\n"); |
1da177e4 LT |
1231 | |
1232 | /* Now login */ | |
1233 | send_srp_login(hostdata); | |
1234 | break; | |
1235 | default: | |
6c0a60ec | 1236 | dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format); |
1da177e4 LT |
1237 | } |
1238 | return; | |
2b541f8f DB |
1239 | case 0xFF: /* Hypervisor telling us the connection is closed */ |
1240 | scsi_block_requests(hostdata->host); | |
cefbda2d | 1241 | atomic_set(&hostdata->request_limit, 0); |
2b541f8f DB |
1242 | if (crq->format == 0x06) { |
1243 | /* We need to re-setup the interpartition connection */ | |
6c0a60ec | 1244 | dev_info(hostdata->dev, "Re-enabling adapter!\n"); |
2b541f8f | 1245 | purge_requests(hostdata, DID_REQUEUE); |
d3849d51 DW |
1246 | if ((ibmvscsi_ops->reenable_crq_queue(&hostdata->queue, |
1247 | hostdata)) || | |
1248 | (ibmvscsi_ops->send_crq(hostdata, | |
1249 | 0xC001000000000000LL, 0))) { | |
cefbda2d DB |
1250 | atomic_set(&hostdata->request_limit, |
1251 | -1); | |
6c0a60ec | 1252 | dev_err(hostdata->dev, "error after enable\n"); |
cefbda2d | 1253 | } |
2b541f8f | 1254 | } else { |
6c0a60ec BK |
1255 | dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n", |
1256 | crq->format); | |
1da177e4 | 1257 | |
2b541f8f | 1258 | purge_requests(hostdata, DID_ERROR); |
d3849d51 DW |
1259 | if ((ibmvscsi_ops->reset_crq_queue(&hostdata->queue, |
1260 | hostdata)) || | |
1261 | (ibmvscsi_ops->send_crq(hostdata, | |
1262 | 0xC001000000000000LL, 0))) { | |
cefbda2d DB |
1263 | atomic_set(&hostdata->request_limit, |
1264 | -1); | |
6c0a60ec | 1265 | dev_err(hostdata->dev, "error after reset\n"); |
cefbda2d | 1266 | } |
2b541f8f DB |
1267 | } |
1268 | scsi_unblock_requests(hostdata->host); | |
1da177e4 LT |
1269 | return; |
1270 | case 0x80: /* real payload */ | |
1271 | break; | |
1272 | default: | |
6c0a60ec BK |
1273 | dev_err(hostdata->dev, "got an invalid message type 0x%02x\n", |
1274 | crq->valid); | |
1da177e4 LT |
1275 | return; |
1276 | } | |
1277 | ||
1278 | /* The only kind of payload CRQs we should get are responses to | |
1279 | * things we send. Make sure this response is to something we | |
1280 | * actually sent | |
1281 | */ | |
1282 | if (!valid_event_struct(&hostdata->pool, evt_struct)) { | |
6c0a60ec | 1283 | dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n", |
1da177e4 LT |
1284 | (void *)crq->IU_data_ptr); |
1285 | return; | |
1286 | } | |
1287 | ||
1288 | if (atomic_read(&evt_struct->free)) { | |
6c0a60ec BK |
1289 | dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n", |
1290 | (void *)crq->IU_data_ptr); | |
1da177e4 LT |
1291 | return; |
1292 | } | |
1293 | ||
1294 | if (crq->format == VIOSRP_SRP_FORMAT) | |
ef265673 | 1295 | atomic_add(evt_struct->xfer_iu->srp.rsp.req_lim_delta, |
1da177e4 LT |
1296 | &hostdata->request_limit); |
1297 | ||
3d0e91f7 BK |
1298 | del_timer(&evt_struct->timer); |
1299 | ||
1da177e4 LT |
1300 | if (evt_struct->done) |
1301 | evt_struct->done(evt_struct); | |
1302 | else | |
6c0a60ec | 1303 | dev_err(hostdata->dev, "returned done() is NULL; not running it!\n"); |
1da177e4 LT |
1304 | |
1305 | /* | |
1306 | * Lock the host_lock before messing with these structures, since we | |
1307 | * are running in a task context | |
1308 | */ | |
1309 | spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags); | |
1310 | list_del(&evt_struct->list); | |
1311 | free_event_struct(&evt_struct->hostdata->pool, evt_struct); | |
1312 | spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags); | |
1313 | } | |
1314 | ||
1315 | /** | |
1316 | * ibmvscsi_get_host_config: Send the command to the server to get host | |
1317 | * configuration data. The data is opaque to us. | |
1318 | */ | |
1319 | static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata, | |
1320 | unsigned char *buffer, int length) | |
1321 | { | |
1322 | struct viosrp_host_config *host_config; | |
1323 | struct srp_event_struct *evt_struct; | |
06f923cb | 1324 | unsigned long flags; |
e5dbfa66 | 1325 | dma_addr_t addr; |
1da177e4 LT |
1326 | int rc; |
1327 | ||
1328 | evt_struct = get_event_struct(&hostdata->pool); | |
1329 | if (!evt_struct) { | |
6c0a60ec | 1330 | dev_err(hostdata->dev, "couldn't allocate event for HOST_CONFIG!\n"); |
1da177e4 LT |
1331 | return -1; |
1332 | } | |
1333 | ||
1334 | init_event_struct(evt_struct, | |
1335 | sync_completion, | |
1336 | VIOSRP_MAD_FORMAT, | |
33874a00 | 1337 | init_timeout); |
1da177e4 LT |
1338 | |
1339 | host_config = &evt_struct->iu.mad.host_config; | |
1340 | ||
1341 | /* Set up a lun reset SRP command */ | |
1342 | memset(host_config, 0x00, sizeof(*host_config)); | |
1343 | host_config->common.type = VIOSRP_HOST_CONFIG_TYPE; | |
1344 | host_config->common.length = length; | |
e5dbfa66 FT |
1345 | host_config->buffer = addr = dma_map_single(hostdata->dev, buffer, |
1346 | length, | |
1347 | DMA_BIDIRECTIONAL); | |
1da177e4 LT |
1348 | |
1349 | if (dma_mapping_error(host_config->buffer)) { | |
6c0a60ec | 1350 | dev_err(hostdata->dev, "dma_mapping error getting host config\n"); |
1da177e4 LT |
1351 | free_event_struct(&hostdata->pool, evt_struct); |
1352 | return -1; | |
1353 | } | |
1354 | ||
1355 | init_completion(&evt_struct->comp); | |
06f923cb | 1356 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
3d0e91f7 | 1357 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, init_timeout * 2); |
06f923cb | 1358 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
e5dbfa66 | 1359 | if (rc == 0) |
1da177e4 | 1360 | wait_for_completion(&evt_struct->comp); |
e5dbfa66 | 1361 | dma_unmap_single(hostdata->dev, addr, length, DMA_BIDIRECTIONAL); |
1da177e4 LT |
1362 | |
1363 | return rc; | |
1364 | } | |
1365 | ||
0979c84b RJ |
1366 | /** |
1367 | * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk. | |
1368 | * @sdev: struct scsi_device device to configure | |
1369 | * | |
1370 | * Enable allow_restart for a device if it is a disk. Adjust the | |
1371 | * queue_depth here also as is required by the documentation for | |
1372 | * struct scsi_host_template. | |
1373 | */ | |
1374 | static int ibmvscsi_slave_configure(struct scsi_device *sdev) | |
1375 | { | |
1376 | struct Scsi_Host *shost = sdev->host; | |
1377 | unsigned long lock_flags = 0; | |
1378 | ||
1379 | spin_lock_irqsave(shost->host_lock, lock_flags); | |
1380 | if (sdev->type == TYPE_DISK) | |
1381 | sdev->allow_restart = 1; | |
1382 | scsi_adjust_queue_depth(sdev, 0, shost->cmd_per_lun); | |
1383 | spin_unlock_irqrestore(shost->host_lock, lock_flags); | |
1384 | return 0; | |
1385 | } | |
1386 | ||
742d25b8 BK |
1387 | /** |
1388 | * ibmvscsi_change_queue_depth - Change the device's queue depth | |
1389 | * @sdev: scsi device struct | |
1390 | * @qdepth: depth to set | |
1391 | * | |
1392 | * Return value: | |
1393 | * actual depth set | |
1394 | **/ | |
1395 | static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth) | |
1396 | { | |
1397 | if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN) | |
1398 | qdepth = IBMVSCSI_MAX_CMDS_PER_LUN; | |
1399 | ||
1400 | scsi_adjust_queue_depth(sdev, 0, qdepth); | |
1401 | return sdev->queue_depth; | |
1402 | } | |
1403 | ||
1da177e4 LT |
1404 | /* ------------------------------------------------------------ |
1405 | * sysfs attributes | |
1406 | */ | |
1407 | static ssize_t show_host_srp_version(struct class_device *class_dev, char *buf) | |
1408 | { | |
1409 | struct Scsi_Host *shost = class_to_shost(class_dev); | |
7603e02e | 1410 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1411 | int len; |
1412 | ||
1413 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1414 | hostdata->madapter_info.srp_version); | |
1415 | return len; | |
1416 | } | |
1417 | ||
1418 | static struct class_device_attribute ibmvscsi_host_srp_version = { | |
1419 | .attr = { | |
1420 | .name = "srp_version", | |
1421 | .mode = S_IRUGO, | |
1422 | }, | |
1423 | .show = show_host_srp_version, | |
1424 | }; | |
1425 | ||
1426 | static ssize_t show_host_partition_name(struct class_device *class_dev, | |
1427 | char *buf) | |
1428 | { | |
1429 | struct Scsi_Host *shost = class_to_shost(class_dev); | |
7603e02e | 1430 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1431 | int len; |
1432 | ||
1433 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1434 | hostdata->madapter_info.partition_name); | |
1435 | return len; | |
1436 | } | |
1437 | ||
1438 | static struct class_device_attribute ibmvscsi_host_partition_name = { | |
1439 | .attr = { | |
1440 | .name = "partition_name", | |
1441 | .mode = S_IRUGO, | |
1442 | }, | |
1443 | .show = show_host_partition_name, | |
1444 | }; | |
1445 | ||
1446 | static ssize_t show_host_partition_number(struct class_device *class_dev, | |
1447 | char *buf) | |
1448 | { | |
1449 | struct Scsi_Host *shost = class_to_shost(class_dev); | |
7603e02e | 1450 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1451 | int len; |
1452 | ||
1453 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
1454 | hostdata->madapter_info.partition_number); | |
1455 | return len; | |
1456 | } | |
1457 | ||
1458 | static struct class_device_attribute ibmvscsi_host_partition_number = { | |
1459 | .attr = { | |
1460 | .name = "partition_number", | |
1461 | .mode = S_IRUGO, | |
1462 | }, | |
1463 | .show = show_host_partition_number, | |
1464 | }; | |
1465 | ||
1466 | static ssize_t show_host_mad_version(struct class_device *class_dev, char *buf) | |
1467 | { | |
1468 | struct Scsi_Host *shost = class_to_shost(class_dev); | |
7603e02e | 1469 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1470 | int len; |
1471 | ||
1472 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
1473 | hostdata->madapter_info.mad_version); | |
1474 | return len; | |
1475 | } | |
1476 | ||
1477 | static struct class_device_attribute ibmvscsi_host_mad_version = { | |
1478 | .attr = { | |
1479 | .name = "mad_version", | |
1480 | .mode = S_IRUGO, | |
1481 | }, | |
1482 | .show = show_host_mad_version, | |
1483 | }; | |
1484 | ||
1485 | static ssize_t show_host_os_type(struct class_device *class_dev, char *buf) | |
1486 | { | |
1487 | struct Scsi_Host *shost = class_to_shost(class_dev); | |
7603e02e | 1488 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1489 | int len; |
1490 | ||
1491 | len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type); | |
1492 | return len; | |
1493 | } | |
1494 | ||
1495 | static struct class_device_attribute ibmvscsi_host_os_type = { | |
1496 | .attr = { | |
1497 | .name = "os_type", | |
1498 | .mode = S_IRUGO, | |
1499 | }, | |
1500 | .show = show_host_os_type, | |
1501 | }; | |
1502 | ||
1503 | static ssize_t show_host_config(struct class_device *class_dev, char *buf) | |
1504 | { | |
1505 | struct Scsi_Host *shost = class_to_shost(class_dev); | |
7603e02e | 1506 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1507 | |
1508 | /* returns null-terminated host config data */ | |
1509 | if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0) | |
1510 | return strlen(buf); | |
1511 | else | |
1512 | return 0; | |
1513 | } | |
1514 | ||
1515 | static struct class_device_attribute ibmvscsi_host_config = { | |
1516 | .attr = { | |
1517 | .name = "config", | |
1518 | .mode = S_IRUGO, | |
1519 | }, | |
1520 | .show = show_host_config, | |
1521 | }; | |
1522 | ||
1523 | static struct class_device_attribute *ibmvscsi_attrs[] = { | |
1524 | &ibmvscsi_host_srp_version, | |
1525 | &ibmvscsi_host_partition_name, | |
1526 | &ibmvscsi_host_partition_number, | |
1527 | &ibmvscsi_host_mad_version, | |
1528 | &ibmvscsi_host_os_type, | |
1529 | &ibmvscsi_host_config, | |
1530 | NULL | |
1531 | }; | |
1532 | ||
1533 | /* ------------------------------------------------------------ | |
1534 | * SCSI driver registration | |
1535 | */ | |
1536 | static struct scsi_host_template driver_template = { | |
1537 | .module = THIS_MODULE, | |
1538 | .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION, | |
1539 | .proc_name = "ibmvscsi", | |
1540 | .queuecommand = ibmvscsi_queuecommand, | |
1541 | .eh_abort_handler = ibmvscsi_eh_abort_handler, | |
1542 | .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler, | |
3d0e91f7 | 1543 | .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler, |
0979c84b | 1544 | .slave_configure = ibmvscsi_slave_configure, |
742d25b8 | 1545 | .change_queue_depth = ibmvscsi_change_queue_depth, |
1da177e4 | 1546 | .cmd_per_lun = 16, |
a897ff2a | 1547 | .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT, |
1da177e4 | 1548 | .this_id = -1, |
4dddbc26 | 1549 | .sg_tablesize = SG_ALL, |
1da177e4 | 1550 | .use_clustering = ENABLE_CLUSTERING, |
9cb83c75 | 1551 | .use_sg_chaining = ENABLE_SG_CHAINING, |
1da177e4 LT |
1552 | .shost_attrs = ibmvscsi_attrs, |
1553 | }; | |
1554 | ||
1555 | /** | |
1556 | * Called by bus code for each adapter | |
1557 | */ | |
1558 | static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id) | |
1559 | { | |
1560 | struct ibmvscsi_host_data *hostdata; | |
1561 | struct Scsi_Host *host; | |
1562 | struct device *dev = &vdev->dev; | |
4d680419 FT |
1563 | struct srp_rport_identifiers ids; |
1564 | struct srp_rport *rport; | |
1da177e4 | 1565 | unsigned long wait_switch = 0; |
cefbda2d | 1566 | int rc; |
1da177e4 LT |
1567 | |
1568 | vdev->dev.driver_data = NULL; | |
1569 | ||
a897ff2a | 1570 | driver_template.can_queue = max_requests; |
1da177e4 LT |
1571 | host = scsi_host_alloc(&driver_template, sizeof(*hostdata)); |
1572 | if (!host) { | |
6c0a60ec | 1573 | dev_err(&vdev->dev, "couldn't allocate host data\n"); |
1da177e4 LT |
1574 | goto scsi_host_alloc_failed; |
1575 | } | |
1576 | ||
4d680419 | 1577 | host->transportt = ibmvscsi_transport_template; |
7603e02e | 1578 | hostdata = shost_priv(host); |
1da177e4 LT |
1579 | memset(hostdata, 0x00, sizeof(*hostdata)); |
1580 | INIT_LIST_HEAD(&hostdata->sent); | |
1581 | hostdata->host = host; | |
1582 | hostdata->dev = dev; | |
1583 | atomic_set(&hostdata->request_limit, -1); | |
1584 | hostdata->host->max_sectors = 32 * 8; /* default max I/O 32 pages */ | |
1585 | ||
d3849d51 | 1586 | rc = ibmvscsi_ops->init_crq_queue(&hostdata->queue, hostdata, max_requests); |
cefbda2d | 1587 | if (rc != 0 && rc != H_RESOURCE) { |
6c0a60ec | 1588 | dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc); |
1da177e4 LT |
1589 | goto init_crq_failed; |
1590 | } | |
1591 | if (initialize_event_pool(&hostdata->pool, max_requests, hostdata) != 0) { | |
6c0a60ec | 1592 | dev_err(&vdev->dev, "couldn't initialize event pool\n"); |
1da177e4 LT |
1593 | goto init_pool_failed; |
1594 | } | |
1595 | ||
1596 | host->max_lun = 8; | |
1597 | host->max_id = max_id; | |
1598 | host->max_channel = max_channel; | |
1599 | ||
1600 | if (scsi_add_host(hostdata->host, hostdata->dev)) | |
1601 | goto add_host_failed; | |
1602 | ||
4d680419 FT |
1603 | /* we don't have a proper target_port_id so let's use the fake one */ |
1604 | memcpy(ids.port_id, hostdata->madapter_info.partition_name, | |
1605 | sizeof(ids.port_id)); | |
aebd5e47 | 1606 | ids.roles = SRP_RPORT_ROLE_TARGET; |
4d680419 FT |
1607 | rport = srp_rport_add(host, &ids); |
1608 | if (IS_ERR(rport)) | |
1609 | goto add_srp_port_failed; | |
1610 | ||
1da177e4 LT |
1611 | /* Try to send an initialization message. Note that this is allowed |
1612 | * to fail if the other end is not acive. In that case we don't | |
1613 | * want to scan | |
1614 | */ | |
d3849d51 | 1615 | if (ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0) == 0 |
cefbda2d | 1616 | || rc == H_RESOURCE) { |
1da177e4 LT |
1617 | /* |
1618 | * Wait around max init_timeout secs for the adapter to finish | |
1619 | * initializing. When we are done initializing, we will have a | |
1620 | * valid request_limit. We don't want Linux scanning before | |
1621 | * we are ready. | |
1622 | */ | |
1623 | for (wait_switch = jiffies + (init_timeout * HZ); | |
1624 | time_before(jiffies, wait_switch) && | |
1625 | atomic_read(&hostdata->request_limit) < 2;) { | |
1626 | ||
1627 | msleep(10); | |
1628 | } | |
1629 | ||
1630 | /* if we now have a valid request_limit, initiate a scan */ | |
1631 | if (atomic_read(&hostdata->request_limit) > 0) | |
1632 | scsi_scan_host(host); | |
1633 | } | |
1634 | ||
1635 | vdev->dev.driver_data = hostdata; | |
1636 | return 0; | |
1637 | ||
4d680419 FT |
1638 | add_srp_port_failed: |
1639 | scsi_remove_host(hostdata->host); | |
1da177e4 LT |
1640 | add_host_failed: |
1641 | release_event_pool(&hostdata->pool, hostdata); | |
1642 | init_pool_failed: | |
d3849d51 | 1643 | ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata, max_requests); |
1da177e4 LT |
1644 | init_crq_failed: |
1645 | scsi_host_put(host); | |
1646 | scsi_host_alloc_failed: | |
1647 | return -1; | |
1648 | } | |
1649 | ||
1650 | static int ibmvscsi_remove(struct vio_dev *vdev) | |
1651 | { | |
1652 | struct ibmvscsi_host_data *hostdata = vdev->dev.driver_data; | |
1653 | release_event_pool(&hostdata->pool, hostdata); | |
d3849d51 DW |
1654 | ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata, |
1655 | max_requests); | |
4d680419 FT |
1656 | |
1657 | srp_remove_host(hostdata->host); | |
1da177e4 LT |
1658 | scsi_remove_host(hostdata->host); |
1659 | scsi_host_put(hostdata->host); | |
1660 | ||
1661 | return 0; | |
1662 | } | |
1663 | ||
1664 | /** | |
1665 | * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we | |
1666 | * support. | |
1667 | */ | |
1668 | static struct vio_device_id ibmvscsi_device_table[] __devinitdata = { | |
1669 | {"vscsi", "IBM,v-scsi"}, | |
fb120da6 | 1670 | { "", "" } |
1da177e4 | 1671 | }; |
1da177e4 | 1672 | MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table); |
915124d8 | 1673 | |
1da177e4 | 1674 | static struct vio_driver ibmvscsi_driver = { |
1da177e4 LT |
1675 | .id_table = ibmvscsi_device_table, |
1676 | .probe = ibmvscsi_probe, | |
6fdf5392 SR |
1677 | .remove = ibmvscsi_remove, |
1678 | .driver = { | |
1679 | .name = "ibmvscsi", | |
915124d8 | 1680 | .owner = THIS_MODULE, |
6fdf5392 | 1681 | } |
1da177e4 LT |
1682 | }; |
1683 | ||
4d680419 FT |
1684 | static struct srp_function_template ibmvscsi_transport_functions = { |
1685 | }; | |
1686 | ||
1da177e4 LT |
1687 | int __init ibmvscsi_module_init(void) |
1688 | { | |
4d680419 FT |
1689 | int ret; |
1690 | ||
d3849d51 DW |
1691 | if (firmware_has_feature(FW_FEATURE_ISERIES)) |
1692 | ibmvscsi_ops = &iseriesvscsi_ops; | |
1693 | else if (firmware_has_feature(FW_FEATURE_VIO)) | |
1694 | ibmvscsi_ops = &rpavscsi_ops; | |
1695 | else | |
1696 | return -ENODEV; | |
1697 | ||
4d680419 FT |
1698 | ibmvscsi_transport_template = |
1699 | srp_attach_transport(&ibmvscsi_transport_functions); | |
1700 | if (!ibmvscsi_transport_template) | |
1701 | return -ENOMEM; | |
1702 | ||
1703 | ret = vio_register_driver(&ibmvscsi_driver); | |
1704 | if (ret) | |
1705 | srp_release_transport(ibmvscsi_transport_template); | |
1706 | return ret; | |
1da177e4 LT |
1707 | } |
1708 | ||
1709 | void __exit ibmvscsi_module_exit(void) | |
1710 | { | |
1711 | vio_unregister_driver(&ibmvscsi_driver); | |
4d680419 | 1712 | srp_release_transport(ibmvscsi_transport_template); |
1da177e4 LT |
1713 | } |
1714 | ||
1715 | module_init(ibmvscsi_module_init); | |
1716 | module_exit(ibmvscsi_module_exit); |