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1da177e4 LT |
1 | /* ------------------------------------------------------------ |
2 | * ibmvscsi.c | |
3 | * (C) Copyright IBM Corporation 1994, 2004 | |
4 | * Authors: Colin DeVilbiss (devilbis@us.ibm.com) | |
5 | * Santiago Leon (santil@us.ibm.com) | |
6 | * Dave Boutcher (sleddog@us.ibm.com) | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
21 | * USA | |
22 | * | |
23 | * ------------------------------------------------------------ | |
24 | * Emulation of a SCSI host adapter for Virtual I/O devices | |
25 | * | |
26 | * This driver supports the SCSI adapter implemented by the IBM | |
27 | * Power5 firmware. That SCSI adapter is not a physical adapter, | |
28 | * but allows Linux SCSI peripheral drivers to directly | |
29 | * access devices in another logical partition on the physical system. | |
30 | * | |
31 | * The virtual adapter(s) are present in the open firmware device | |
32 | * tree just like real adapters. | |
33 | * | |
34 | * One of the capabilities provided on these systems is the ability | |
35 | * to DMA between partitions. The architecture states that for VSCSI, | |
36 | * the server side is allowed to DMA to and from the client. The client | |
37 | * is never trusted to DMA to or from the server directly. | |
38 | * | |
39 | * Messages are sent between partitions on a "Command/Response Queue" | |
40 | * (CRQ), which is just a buffer of 16 byte entries in the receiver's | |
41 | * Senders cannot access the buffer directly, but send messages by | |
42 | * making a hypervisor call and passing in the 16 bytes. The hypervisor | |
9b7dac08 | 43 | * puts the message in the next 16 byte space in round-robin fashion, |
1da177e4 LT |
44 | * turns on the high order bit of the message (the valid bit), and |
45 | * generates an interrupt to the receiver (if interrupts are turned on.) | |
46 | * The receiver just turns off the valid bit when they have copied out | |
47 | * the message. | |
48 | * | |
49 | * The VSCSI client builds a SCSI Remote Protocol (SRP) Information Unit | |
50 | * (IU) (as defined in the T10 standard available at www.t10.org), gets | |
51 | * a DMA address for the message, and sends it to the server as the | |
52 | * payload of a CRQ message. The server DMAs the SRP IU and processes it, | |
53 | * including doing any additional data transfers. When it is done, it | |
54 | * DMAs the SRP response back to the same address as the request came from, | |
55 | * and sends a CRQ message back to inform the client that the request has | |
56 | * completed. | |
57 | * | |
7834799a | 58 | * TODO: This is currently pretty tied to the IBM pSeries hypervisor |
1da177e4 LT |
59 | * interfaces. It would be really nice to abstract this above an RDMA |
60 | * layer. | |
61 | */ | |
62 | ||
63 | #include <linux/module.h> | |
64 | #include <linux/moduleparam.h> | |
65 | #include <linux/dma-mapping.h> | |
66 | #include <linux/delay.h> | |
5a0e3ad6 | 67 | #include <linux/slab.h> |
126c5cc3 | 68 | #include <linux/of.h> |
64355b92 | 69 | #include <linux/pm.h> |
0f33ece5 | 70 | #include <linux/kthread.h> |
d3849d51 | 71 | #include <asm/firmware.h> |
1da177e4 LT |
72 | #include <asm/vio.h> |
73 | #include <scsi/scsi.h> | |
74 | #include <scsi/scsi_cmnd.h> | |
75 | #include <scsi/scsi_host.h> | |
76 | #include <scsi/scsi_device.h> | |
4d680419 | 77 | #include <scsi/scsi_transport_srp.h> |
1da177e4 LT |
78 | #include "ibmvscsi.h" |
79 | ||
80 | /* The values below are somewhat arbitrary default values, but | |
81 | * OS/400 will use 3 busses (disks, CDs, tapes, I think.) | |
82 | * Note that there are 3 bits of channel value, 6 bits of id, and | |
83 | * 5 bits of LUN. | |
84 | */ | |
85 | static int max_id = 64; | |
86 | static int max_channel = 3; | |
e1a5ce5b RJ |
87 | static int init_timeout = 300; |
88 | static int login_timeout = 60; | |
89 | static int info_timeout = 30; | |
90 | static int abort_timeout = 60; | |
91 | static int reset_timeout = 60; | |
a897ff2a | 92 | static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT; |
4f10aae0 | 93 | static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2; |
c1988e31 | 94 | static int fast_fail = 1; |
126c5cc3 | 95 | static int client_reserve = 1; |
9965c2f1 BH |
96 | static char partition_name[97] = "UNKNOWN"; |
97 | static unsigned int partition_number = -1; | |
1da177e4 | 98 | |
4d680419 FT |
99 | static struct scsi_transport_template *ibmvscsi_transport_template; |
100 | ||
aac3118d | 101 | #define IBMVSCSI_VERSION "1.5.9" |
1da177e4 LT |
102 | |
103 | MODULE_DESCRIPTION("IBM Virtual SCSI"); | |
104 | MODULE_AUTHOR("Dave Boutcher"); | |
105 | MODULE_LICENSE("GPL"); | |
106 | MODULE_VERSION(IBMVSCSI_VERSION); | |
107 | ||
108 | module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR); | |
109 | MODULE_PARM_DESC(max_id, "Largest ID value for each channel"); | |
110 | module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR); | |
111 | MODULE_PARM_DESC(max_channel, "Largest channel value"); | |
112 | module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR); | |
113 | MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds"); | |
21465eda | 114 | module_param_named(max_requests, max_requests, int, S_IRUGO); |
1da177e4 | 115 | MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter"); |
c1988e31 RJ |
116 | module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR); |
117 | MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]"); | |
126c5cc3 BK |
118 | module_param_named(client_reserve, client_reserve, int, S_IRUGO ); |
119 | MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release"); | |
1da177e4 | 120 | |
9965c2f1 BH |
121 | static void ibmvscsi_handle_crq(struct viosrp_crq *crq, |
122 | struct ibmvscsi_host_data *hostdata); | |
123 | ||
124 | /* ------------------------------------------------------------ | |
125 | * Routines for managing the command/response queue | |
126 | */ | |
127 | /** | |
128 | * ibmvscsi_handle_event: - Interrupt handler for crq events | |
129 | * @irq: number of irq to handle, not used | |
130 | * @dev_instance: ibmvscsi_host_data of host that received interrupt | |
131 | * | |
132 | * Disables interrupts and schedules srp_task | |
133 | * Always returns IRQ_HANDLED | |
134 | */ | |
135 | static irqreturn_t ibmvscsi_handle_event(int irq, void *dev_instance) | |
136 | { | |
137 | struct ibmvscsi_host_data *hostdata = | |
138 | (struct ibmvscsi_host_data *)dev_instance; | |
139 | vio_disable_interrupts(to_vio_dev(hostdata->dev)); | |
140 | tasklet_schedule(&hostdata->srp_task); | |
141 | return IRQ_HANDLED; | |
142 | } | |
143 | ||
144 | /** | |
145 | * release_crq_queue: - Deallocates data and unregisters CRQ | |
146 | * @queue: crq_queue to initialize and register | |
147 | * @host_data: ibmvscsi_host_data of host | |
148 | * | |
149 | * Frees irq, deallocates a page for messages, unmaps dma, and unregisters | |
150 | * the crq with the hypervisor. | |
151 | */ | |
152 | static void ibmvscsi_release_crq_queue(struct crq_queue *queue, | |
153 | struct ibmvscsi_host_data *hostdata, | |
154 | int max_requests) | |
155 | { | |
156 | long rc = 0; | |
157 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
158 | free_irq(vdev->irq, (void *)hostdata); | |
159 | tasklet_kill(&hostdata->srp_task); | |
160 | do { | |
161 | if (rc) | |
162 | msleep(100); | |
163 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); | |
164 | } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); | |
165 | dma_unmap_single(hostdata->dev, | |
166 | queue->msg_token, | |
167 | queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL); | |
168 | free_page((unsigned long)queue->msgs); | |
169 | } | |
170 | ||
171 | /** | |
172 | * crq_queue_next_crq: - Returns the next entry in message queue | |
173 | * @queue: crq_queue to use | |
174 | * | |
175 | * Returns pointer to next entry in queue, or NULL if there are no new | |
176 | * entried in the CRQ. | |
177 | */ | |
178 | static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue) | |
179 | { | |
180 | struct viosrp_crq *crq; | |
181 | unsigned long flags; | |
182 | ||
183 | spin_lock_irqsave(&queue->lock, flags); | |
184 | crq = &queue->msgs[queue->cur]; | |
185 | if (crq->valid & 0x80) { | |
186 | if (++queue->cur == queue->size) | |
187 | queue->cur = 0; | |
188 | } else | |
189 | crq = NULL; | |
190 | spin_unlock_irqrestore(&queue->lock, flags); | |
191 | ||
192 | return crq; | |
193 | } | |
194 | ||
195 | /** | |
196 | * ibmvscsi_send_crq: - Send a CRQ | |
197 | * @hostdata: the adapter | |
198 | * @word1: the first 64 bits of the data | |
199 | * @word2: the second 64 bits of the data | |
200 | */ | |
201 | static int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata, | |
202 | u64 word1, u64 word2) | |
203 | { | |
204 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
205 | ||
206 | return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2); | |
207 | } | |
208 | ||
209 | /** | |
210 | * ibmvscsi_task: - Process srps asynchronously | |
211 | * @data: ibmvscsi_host_data of host | |
212 | */ | |
213 | static void ibmvscsi_task(void *data) | |
214 | { | |
215 | struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data; | |
216 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
217 | struct viosrp_crq *crq; | |
218 | int done = 0; | |
219 | ||
220 | while (!done) { | |
221 | /* Pull all the valid messages off the CRQ */ | |
222 | while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) { | |
223 | ibmvscsi_handle_crq(crq, hostdata); | |
224 | crq->valid = 0x00; | |
225 | } | |
226 | ||
227 | vio_enable_interrupts(vdev); | |
228 | crq = crq_queue_next_crq(&hostdata->queue); | |
229 | if (crq != NULL) { | |
230 | vio_disable_interrupts(vdev); | |
231 | ibmvscsi_handle_crq(crq, hostdata); | |
232 | crq->valid = 0x00; | |
233 | } else { | |
234 | done = 1; | |
235 | } | |
236 | } | |
237 | } | |
238 | ||
239 | static void gather_partition_info(void) | |
240 | { | |
241 | struct device_node *rootdn; | |
242 | ||
243 | const char *ppartition_name; | |
244 | const unsigned int *p_number_ptr; | |
245 | ||
246 | /* Retrieve information about this partition */ | |
247 | rootdn = of_find_node_by_path("/"); | |
248 | if (!rootdn) { | |
249 | return; | |
250 | } | |
251 | ||
252 | ppartition_name = of_get_property(rootdn, "ibm,partition-name", NULL); | |
253 | if (ppartition_name) | |
254 | strncpy(partition_name, ppartition_name, | |
255 | sizeof(partition_name)); | |
256 | p_number_ptr = of_get_property(rootdn, "ibm,partition-no", NULL); | |
257 | if (p_number_ptr) | |
258 | partition_number = *p_number_ptr; | |
259 | of_node_put(rootdn); | |
260 | } | |
261 | ||
262 | static void set_adapter_info(struct ibmvscsi_host_data *hostdata) | |
263 | { | |
264 | memset(&hostdata->madapter_info, 0x00, | |
265 | sizeof(hostdata->madapter_info)); | |
266 | ||
267 | dev_info(hostdata->dev, "SRP_VERSION: %s\n", SRP_VERSION); | |
268 | strcpy(hostdata->madapter_info.srp_version, SRP_VERSION); | |
269 | ||
270 | strncpy(hostdata->madapter_info.partition_name, partition_name, | |
271 | sizeof(hostdata->madapter_info.partition_name)); | |
272 | ||
273 | hostdata->madapter_info.partition_number = partition_number; | |
274 | ||
275 | hostdata->madapter_info.mad_version = 1; | |
276 | hostdata->madapter_info.os_type = 2; | |
277 | } | |
278 | ||
279 | /** | |
280 | * reset_crq_queue: - resets a crq after a failure | |
281 | * @queue: crq_queue to initialize and register | |
282 | * @hostdata: ibmvscsi_host_data of host | |
283 | * | |
284 | */ | |
285 | static int ibmvscsi_reset_crq_queue(struct crq_queue *queue, | |
286 | struct ibmvscsi_host_data *hostdata) | |
287 | { | |
288 | int rc = 0; | |
289 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
290 | ||
291 | /* Close the CRQ */ | |
292 | do { | |
293 | if (rc) | |
294 | msleep(100); | |
295 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); | |
296 | } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); | |
297 | ||
298 | /* Clean out the queue */ | |
299 | memset(queue->msgs, 0x00, PAGE_SIZE); | |
300 | queue->cur = 0; | |
301 | ||
302 | set_adapter_info(hostdata); | |
303 | ||
304 | /* And re-open it again */ | |
305 | rc = plpar_hcall_norets(H_REG_CRQ, | |
306 | vdev->unit_address, | |
307 | queue->msg_token, PAGE_SIZE); | |
308 | if (rc == 2) { | |
309 | /* Adapter is good, but other end is not ready */ | |
310 | dev_warn(hostdata->dev, "Partner adapter not ready\n"); | |
311 | } else if (rc != 0) { | |
312 | dev_warn(hostdata->dev, "couldn't register crq--rc 0x%x\n", rc); | |
313 | } | |
314 | return rc; | |
315 | } | |
316 | ||
317 | /** | |
318 | * initialize_crq_queue: - Initializes and registers CRQ with hypervisor | |
319 | * @queue: crq_queue to initialize and register | |
320 | * @hostdata: ibmvscsi_host_data of host | |
321 | * | |
322 | * Allocates a page for messages, maps it for dma, and registers | |
323 | * the crq with the hypervisor. | |
324 | * Returns zero on success. | |
325 | */ | |
326 | static int ibmvscsi_init_crq_queue(struct crq_queue *queue, | |
327 | struct ibmvscsi_host_data *hostdata, | |
328 | int max_requests) | |
329 | { | |
330 | int rc; | |
331 | int retrc; | |
332 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
333 | ||
334 | queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL); | |
335 | ||
336 | if (!queue->msgs) | |
337 | goto malloc_failed; | |
338 | queue->size = PAGE_SIZE / sizeof(*queue->msgs); | |
339 | ||
340 | queue->msg_token = dma_map_single(hostdata->dev, queue->msgs, | |
341 | queue->size * sizeof(*queue->msgs), | |
342 | DMA_BIDIRECTIONAL); | |
343 | ||
344 | if (dma_mapping_error(hostdata->dev, queue->msg_token)) | |
345 | goto map_failed; | |
346 | ||
347 | gather_partition_info(); | |
348 | set_adapter_info(hostdata); | |
349 | ||
350 | retrc = rc = plpar_hcall_norets(H_REG_CRQ, | |
351 | vdev->unit_address, | |
352 | queue->msg_token, PAGE_SIZE); | |
353 | if (rc == H_RESOURCE) | |
354 | /* maybe kexecing and resource is busy. try a reset */ | |
355 | rc = ibmvscsi_reset_crq_queue(queue, | |
356 | hostdata); | |
357 | ||
358 | if (rc == 2) { | |
359 | /* Adapter is good, but other end is not ready */ | |
360 | dev_warn(hostdata->dev, "Partner adapter not ready\n"); | |
361 | retrc = 0; | |
362 | } else if (rc != 0) { | |
363 | dev_warn(hostdata->dev, "Error %d opening adapter\n", rc); | |
364 | goto reg_crq_failed; | |
365 | } | |
366 | ||
367 | queue->cur = 0; | |
368 | spin_lock_init(&queue->lock); | |
369 | ||
370 | tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task, | |
371 | (unsigned long)hostdata); | |
372 | ||
373 | if (request_irq(vdev->irq, | |
374 | ibmvscsi_handle_event, | |
375 | 0, "ibmvscsi", (void *)hostdata) != 0) { | |
376 | dev_err(hostdata->dev, "couldn't register irq 0x%x\n", | |
377 | vdev->irq); | |
378 | goto req_irq_failed; | |
379 | } | |
380 | ||
381 | rc = vio_enable_interrupts(vdev); | |
382 | if (rc != 0) { | |
383 | dev_err(hostdata->dev, "Error %d enabling interrupts!!!\n", rc); | |
384 | goto req_irq_failed; | |
385 | } | |
386 | ||
387 | return retrc; | |
388 | ||
389 | req_irq_failed: | |
390 | tasklet_kill(&hostdata->srp_task); | |
391 | rc = 0; | |
392 | do { | |
393 | if (rc) | |
394 | msleep(100); | |
395 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); | |
396 | } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); | |
397 | reg_crq_failed: | |
398 | dma_unmap_single(hostdata->dev, | |
399 | queue->msg_token, | |
400 | queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL); | |
401 | map_failed: | |
402 | free_page((unsigned long)queue->msgs); | |
403 | malloc_failed: | |
404 | return -1; | |
405 | } | |
406 | ||
407 | /** | |
408 | * reenable_crq_queue: - reenables a crq after | |
409 | * @queue: crq_queue to initialize and register | |
410 | * @hostdata: ibmvscsi_host_data of host | |
411 | * | |
412 | */ | |
413 | static int ibmvscsi_reenable_crq_queue(struct crq_queue *queue, | |
414 | struct ibmvscsi_host_data *hostdata) | |
415 | { | |
416 | int rc = 0; | |
417 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
418 | ||
419 | /* Re-enable the CRQ */ | |
420 | do { | |
421 | if (rc) | |
422 | msleep(100); | |
423 | rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address); | |
424 | } while ((rc == H_IN_PROGRESS) || (rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); | |
425 | ||
426 | if (rc) | |
427 | dev_err(hostdata->dev, "Error %d enabling adapter\n", rc); | |
428 | return rc; | |
429 | } | |
430 | ||
1da177e4 LT |
431 | /* ------------------------------------------------------------ |
432 | * Routines for the event pool and event structs | |
433 | */ | |
434 | /** | |
435 | * initialize_event_pool: - Allocates and initializes the event pool for a host | |
436 | * @pool: event_pool to be initialized | |
437 | * @size: Number of events in pool | |
438 | * @hostdata: ibmvscsi_host_data who owns the event pool | |
439 | * | |
440 | * Returns zero on success. | |
441 | */ | |
442 | static int initialize_event_pool(struct event_pool *pool, | |
443 | int size, struct ibmvscsi_host_data *hostdata) | |
444 | { | |
445 | int i; | |
446 | ||
447 | pool->size = size; | |
448 | pool->next = 0; | |
4c021dd1 | 449 | pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL); |
1da177e4 LT |
450 | if (!pool->events) |
451 | return -ENOMEM; | |
1da177e4 LT |
452 | |
453 | pool->iu_storage = | |
454 | dma_alloc_coherent(hostdata->dev, | |
455 | pool->size * sizeof(*pool->iu_storage), | |
456 | &pool->iu_token, 0); | |
457 | if (!pool->iu_storage) { | |
458 | kfree(pool->events); | |
459 | return -ENOMEM; | |
460 | } | |
461 | ||
462 | for (i = 0; i < pool->size; ++i) { | |
463 | struct srp_event_struct *evt = &pool->events[i]; | |
464 | memset(&evt->crq, 0x00, sizeof(evt->crq)); | |
465 | atomic_set(&evt->free, 1); | |
466 | evt->crq.valid = 0x80; | |
467 | evt->crq.IU_length = sizeof(*evt->xfer_iu); | |
468 | evt->crq.IU_data_ptr = pool->iu_token + | |
469 | sizeof(*evt->xfer_iu) * i; | |
470 | evt->xfer_iu = pool->iu_storage + i; | |
471 | evt->hostdata = hostdata; | |
4dddbc26 JB |
472 | evt->ext_list = NULL; |
473 | evt->ext_list_token = 0; | |
1da177e4 LT |
474 | } |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
479 | /** | |
480 | * release_event_pool: - Frees memory of an event pool of a host | |
481 | * @pool: event_pool to be released | |
482 | * @hostdata: ibmvscsi_host_data who owns the even pool | |
483 | * | |
484 | * Returns zero on success. | |
485 | */ | |
486 | static void release_event_pool(struct event_pool *pool, | |
487 | struct ibmvscsi_host_data *hostdata) | |
488 | { | |
489 | int i, in_use = 0; | |
4dddbc26 | 490 | for (i = 0; i < pool->size; ++i) { |
1da177e4 LT |
491 | if (atomic_read(&pool->events[i].free) != 1) |
492 | ++in_use; | |
4dddbc26 JB |
493 | if (pool->events[i].ext_list) { |
494 | dma_free_coherent(hostdata->dev, | |
ef265673 | 495 | SG_ALL * sizeof(struct srp_direct_buf), |
4dddbc26 JB |
496 | pool->events[i].ext_list, |
497 | pool->events[i].ext_list_token); | |
498 | } | |
499 | } | |
1da177e4 | 500 | if (in_use) |
6c0a60ec BK |
501 | dev_warn(hostdata->dev, "releasing event pool with %d " |
502 | "events still in use?\n", in_use); | |
1da177e4 LT |
503 | kfree(pool->events); |
504 | dma_free_coherent(hostdata->dev, | |
505 | pool->size * sizeof(*pool->iu_storage), | |
506 | pool->iu_storage, pool->iu_token); | |
507 | } | |
508 | ||
509 | /** | |
510 | * valid_event_struct: - Determines if event is valid. | |
511 | * @pool: event_pool that contains the event | |
512 | * @evt: srp_event_struct to be checked for validity | |
513 | * | |
514 | * Returns zero if event is invalid, one otherwise. | |
515 | */ | |
516 | static int valid_event_struct(struct event_pool *pool, | |
517 | struct srp_event_struct *evt) | |
518 | { | |
519 | int index = evt - pool->events; | |
520 | if (index < 0 || index >= pool->size) /* outside of bounds */ | |
521 | return 0; | |
522 | if (evt != pool->events + index) /* unaligned */ | |
523 | return 0; | |
524 | return 1; | |
525 | } | |
526 | ||
527 | /** | |
528 | * ibmvscsi_free-event_struct: - Changes status of event to "free" | |
529 | * @pool: event_pool that contains the event | |
530 | * @evt: srp_event_struct to be modified | |
531 | * | |
532 | */ | |
533 | static void free_event_struct(struct event_pool *pool, | |
534 | struct srp_event_struct *evt) | |
535 | { | |
536 | if (!valid_event_struct(pool, evt)) { | |
6c0a60ec BK |
537 | dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p " |
538 | "(not in pool %p)\n", evt, pool->events); | |
1da177e4 LT |
539 | return; |
540 | } | |
541 | if (atomic_inc_return(&evt->free) != 1) { | |
6c0a60ec BK |
542 | dev_err(evt->hostdata->dev, "Freeing event_struct %p " |
543 | "which is not in use!\n", evt); | |
1da177e4 LT |
544 | return; |
545 | } | |
546 | } | |
547 | ||
548 | /** | |
549 | * get_evt_struct: - Gets the next free event in pool | |
550 | * @pool: event_pool that contains the events to be searched | |
551 | * | |
552 | * Returns the next event in "free" state, and NULL if none are free. | |
553 | * Note that no synchronization is done here, we assume the host_lock | |
554 | * will syncrhonze things. | |
555 | */ | |
556 | static struct srp_event_struct *get_event_struct(struct event_pool *pool) | |
557 | { | |
558 | int i; | |
559 | int poolsize = pool->size; | |
560 | int offset = pool->next; | |
561 | ||
562 | for (i = 0; i < poolsize; i++) { | |
563 | offset = (offset + 1) % poolsize; | |
564 | if (!atomic_dec_if_positive(&pool->events[offset].free)) { | |
565 | pool->next = offset; | |
566 | return &pool->events[offset]; | |
567 | } | |
568 | } | |
569 | ||
570 | printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n"); | |
571 | return NULL; | |
572 | } | |
573 | ||
574 | /** | |
575 | * init_event_struct: Initialize fields in an event struct that are always | |
576 | * required. | |
577 | * @evt: The event | |
578 | * @done: Routine to call when the event is responded to | |
579 | * @format: SRP or MAD format | |
580 | * @timeout: timeout value set in the CRQ | |
581 | */ | |
582 | static void init_event_struct(struct srp_event_struct *evt_struct, | |
583 | void (*done) (struct srp_event_struct *), | |
584 | u8 format, | |
585 | int timeout) | |
586 | { | |
587 | evt_struct->cmnd = NULL; | |
588 | evt_struct->cmnd_done = NULL; | |
589 | evt_struct->sync_srp = NULL; | |
590 | evt_struct->crq.format = format; | |
591 | evt_struct->crq.timeout = timeout; | |
592 | evt_struct->done = done; | |
593 | } | |
594 | ||
595 | /* ------------------------------------------------------------ | |
596 | * Routines for receiving SCSI responses from the hosting partition | |
597 | */ | |
598 | ||
599 | /** | |
600 | * set_srp_direction: Set the fields in the srp related to data | |
601 | * direction and number of buffers based on the direction in | |
602 | * the scsi_cmnd and the number of buffers | |
603 | */ | |
604 | static void set_srp_direction(struct scsi_cmnd *cmd, | |
605 | struct srp_cmd *srp_cmd, | |
606 | int numbuf) | |
607 | { | |
ef265673 FT |
608 | u8 fmt; |
609 | ||
1da177e4 LT |
610 | if (numbuf == 0) |
611 | return; | |
612 | ||
ef265673 FT |
613 | if (numbuf == 1) |
614 | fmt = SRP_DATA_DESC_DIRECT; | |
615 | else { | |
616 | fmt = SRP_DATA_DESC_INDIRECT; | |
617 | numbuf = min(numbuf, MAX_INDIRECT_BUFS); | |
618 | ||
1da177e4 | 619 | if (cmd->sc_data_direction == DMA_TO_DEVICE) |
ef265673 FT |
620 | srp_cmd->data_out_desc_cnt = numbuf; |
621 | else | |
622 | srp_cmd->data_in_desc_cnt = numbuf; | |
1da177e4 | 623 | } |
ef265673 FT |
624 | |
625 | if (cmd->sc_data_direction == DMA_TO_DEVICE) | |
626 | srp_cmd->buf_fmt = fmt << 4; | |
627 | else | |
628 | srp_cmd->buf_fmt = fmt; | |
1da177e4 LT |
629 | } |
630 | ||
631 | /** | |
632 | * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format | |
633 | * @cmd: srp_cmd whose additional_data member will be unmapped | |
634 | * @dev: device for which the memory is mapped | |
635 | * | |
636 | */ | |
4dddbc26 JB |
637 | static void unmap_cmd_data(struct srp_cmd *cmd, |
638 | struct srp_event_struct *evt_struct, | |
639 | struct device *dev) | |
1da177e4 | 640 | { |
ef265673 FT |
641 | u8 out_fmt, in_fmt; |
642 | ||
643 | out_fmt = cmd->buf_fmt >> 4; | |
644 | in_fmt = cmd->buf_fmt & ((1U << 4) - 1); | |
645 | ||
646 | if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC) | |
1da177e4 | 647 | return; |
4dddbc26 | 648 | |
a71fa1fc FT |
649 | if (evt_struct->cmnd) |
650 | scsi_dma_unmap(evt_struct->cmnd); | |
1da177e4 LT |
651 | } |
652 | ||
9413d7b8 | 653 | static int map_sg_list(struct scsi_cmnd *cmd, int nseg, |
ef265673 | 654 | struct srp_direct_buf *md) |
4dddbc26 JB |
655 | { |
656 | int i; | |
9413d7b8 | 657 | struct scatterlist *sg; |
4dddbc26 JB |
658 | u64 total_length = 0; |
659 | ||
9413d7b8 | 660 | scsi_for_each_sg(cmd, sg, nseg, i) { |
ef265673 | 661 | struct srp_direct_buf *descr = md + i; |
9413d7b8 FT |
662 | descr->va = sg_dma_address(sg); |
663 | descr->len = sg_dma_len(sg); | |
ef265673 | 664 | descr->key = 0; |
9413d7b8 | 665 | total_length += sg_dma_len(sg); |
4dddbc26 JB |
666 | } |
667 | return total_length; | |
668 | } | |
669 | ||
1da177e4 LT |
670 | /** |
671 | * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields | |
672 | * @cmd: Scsi_Cmnd with the scatterlist | |
673 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
674 | * @dev: device for which to map dma memory | |
675 | * | |
676 | * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd. | |
677 | * Returns 1 on success. | |
678 | */ | |
679 | static int map_sg_data(struct scsi_cmnd *cmd, | |
4dddbc26 | 680 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
681 | struct srp_cmd *srp_cmd, struct device *dev) |
682 | { | |
683 | ||
4dddbc26 | 684 | int sg_mapped; |
1da177e4 | 685 | u64 total_length = 0; |
ef265673 FT |
686 | struct srp_direct_buf *data = |
687 | (struct srp_direct_buf *) srp_cmd->add_data; | |
688 | struct srp_indirect_buf *indirect = | |
689 | (struct srp_indirect_buf *) data; | |
1da177e4 | 690 | |
9413d7b8 FT |
691 | sg_mapped = scsi_dma_map(cmd); |
692 | if (!sg_mapped) | |
693 | return 1; | |
694 | else if (sg_mapped < 0) | |
1da177e4 LT |
695 | return 0; |
696 | ||
697 | set_srp_direction(cmd, srp_cmd, sg_mapped); | |
698 | ||
699 | /* special case; we can use a single direct descriptor */ | |
700 | if (sg_mapped == 1) { | |
9413d7b8 | 701 | map_sg_list(cmd, sg_mapped, data); |
1da177e4 LT |
702 | return 1; |
703 | } | |
704 | ||
ef265673 FT |
705 | indirect->table_desc.va = 0; |
706 | indirect->table_desc.len = sg_mapped * sizeof(struct srp_direct_buf); | |
707 | indirect->table_desc.key = 0; | |
4dddbc26 JB |
708 | |
709 | if (sg_mapped <= MAX_INDIRECT_BUFS) { | |
9413d7b8 | 710 | total_length = map_sg_list(cmd, sg_mapped, |
ef265673 FT |
711 | &indirect->desc_list[0]); |
712 | indirect->len = total_length; | |
4dddbc26 | 713 | return 1; |
1da177e4 | 714 | } |
1da177e4 | 715 | |
4dddbc26 JB |
716 | /* get indirect table */ |
717 | if (!evt_struct->ext_list) { | |
ef265673 | 718 | evt_struct->ext_list = (struct srp_direct_buf *) |
9413d7b8 | 719 | dma_alloc_coherent(dev, |
ef265673 FT |
720 | SG_ALL * sizeof(struct srp_direct_buf), |
721 | &evt_struct->ext_list_token, 0); | |
4dddbc26 | 722 | if (!evt_struct->ext_list) { |
7912a0ac RJ |
723 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
724 | sdev_printk(KERN_ERR, cmd->device, | |
725 | "Can't allocate memory " | |
726 | "for indirect table\n"); | |
e637d553 | 727 | scsi_dma_unmap(cmd); |
4dddbc26 | 728 | return 0; |
4dddbc26 JB |
729 | } |
730 | } | |
731 | ||
9413d7b8 | 732 | total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list); |
4dddbc26 | 733 | |
ef265673 FT |
734 | indirect->len = total_length; |
735 | indirect->table_desc.va = evt_struct->ext_list_token; | |
736 | indirect->table_desc.len = sg_mapped * sizeof(indirect->desc_list[0]); | |
737 | memcpy(indirect->desc_list, evt_struct->ext_list, | |
738 | MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf)); | |
4dddbc26 | 739 | return 1; |
1da177e4 LT |
740 | } |
741 | ||
1da177e4 LT |
742 | /** |
743 | * map_data_for_srp_cmd: - Calls functions to map data for srp cmds | |
744 | * @cmd: struct scsi_cmnd with the memory to be mapped | |
745 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
746 | * @dev: dma device for which to map dma memory | |
747 | * | |
748 | * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds | |
749 | * Returns 1 on success. | |
750 | */ | |
751 | static int map_data_for_srp_cmd(struct scsi_cmnd *cmd, | |
4dddbc26 | 752 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
753 | struct srp_cmd *srp_cmd, struct device *dev) |
754 | { | |
755 | switch (cmd->sc_data_direction) { | |
756 | case DMA_FROM_DEVICE: | |
757 | case DMA_TO_DEVICE: | |
758 | break; | |
759 | case DMA_NONE: | |
760 | return 1; | |
761 | case DMA_BIDIRECTIONAL: | |
6c0a60ec BK |
762 | sdev_printk(KERN_ERR, cmd->device, |
763 | "Can't map DMA_BIDIRECTIONAL to read/write\n"); | |
1da177e4 LT |
764 | return 0; |
765 | default: | |
6c0a60ec BK |
766 | sdev_printk(KERN_ERR, cmd->device, |
767 | "Unknown data direction 0x%02x; can't map!\n", | |
768 | cmd->sc_data_direction); | |
1da177e4 LT |
769 | return 0; |
770 | } | |
771 | ||
9413d7b8 | 772 | return map_sg_data(cmd, evt_struct, srp_cmd, dev); |
1da177e4 LT |
773 | } |
774 | ||
3d0e91f7 BK |
775 | /** |
776 | * purge_requests: Our virtual adapter just shut down. purge any sent requests | |
777 | * @hostdata: the adapter | |
778 | */ | |
779 | static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code) | |
780 | { | |
1117ef8a | 781 | struct srp_event_struct *evt; |
3d0e91f7 BK |
782 | unsigned long flags; |
783 | ||
784 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1117ef8a BK |
785 | while (!list_empty(&hostdata->sent)) { |
786 | evt = list_first_entry(&hostdata->sent, struct srp_event_struct, list); | |
787 | list_del(&evt->list); | |
788 | del_timer(&evt->timer); | |
789 | ||
790 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
791 | if (evt->cmnd) { | |
792 | evt->cmnd->result = (error_code << 16); | |
793 | unmap_cmd_data(&evt->iu.srp.cmd, evt, | |
794 | evt->hostdata->dev); | |
795 | if (evt->cmnd_done) | |
796 | evt->cmnd_done(evt->cmnd); | |
797 | } else if (evt->done) | |
798 | evt->done(evt); | |
799 | free_event_struct(&evt->hostdata->pool, evt); | |
800 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
3d0e91f7 BK |
801 | } |
802 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
803 | } | |
804 | ||
805 | /** | |
806 | * ibmvscsi_reset_host - Reset the connection to the server | |
807 | * @hostdata: struct ibmvscsi_host_data to reset | |
808 | */ | |
809 | static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata) | |
810 | { | |
811 | scsi_block_requests(hostdata->host); | |
812 | atomic_set(&hostdata->request_limit, 0); | |
813 | ||
814 | purge_requests(hostdata, DID_ERROR); | |
0f33ece5 BK |
815 | hostdata->reset_crq = 1; |
816 | wake_up(&hostdata->work_wait_q); | |
3d0e91f7 BK |
817 | } |
818 | ||
819 | /** | |
820 | * ibmvscsi_timeout - Internal command timeout handler | |
821 | * @evt_struct: struct srp_event_struct that timed out | |
822 | * | |
823 | * Called when an internally generated command times out | |
824 | */ | |
825 | static void ibmvscsi_timeout(struct srp_event_struct *evt_struct) | |
826 | { | |
827 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
828 | ||
829 | dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n", | |
830 | evt_struct->iu.srp.cmd.opcode); | |
831 | ||
832 | ibmvscsi_reset_host(hostdata); | |
833 | } | |
834 | ||
835 | ||
1da177e4 LT |
836 | /* ------------------------------------------------------------ |
837 | * Routines for sending and receiving SRPs | |
838 | */ | |
839 | /** | |
840 | * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq() | |
841 | * @evt_struct: evt_struct to be sent | |
842 | * @hostdata: ibmvscsi_host_data of host | |
3d0e91f7 | 843 | * @timeout: timeout in seconds - 0 means do not time command |
1da177e4 LT |
844 | * |
845 | * Returns the value returned from ibmvscsi_send_crq(). (Zero for success) | |
846 | * Note that this routine assumes that host_lock is held for synchronization | |
847 | */ | |
848 | static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct, | |
3d0e91f7 BK |
849 | struct ibmvscsi_host_data *hostdata, |
850 | unsigned long timeout) | |
1da177e4 | 851 | { |
1da177e4 | 852 | u64 *crq_as_u64 = (u64 *) &evt_struct->crq; |
3c887e8a | 853 | int request_status = 0; |
1da177e4 | 854 | int rc; |
f3a9c4d7 | 855 | int srp_req = 0; |
1da177e4 | 856 | |
a897ff2a RJ |
857 | /* If we have exhausted our request limit, just fail this request, |
858 | * unless it is for a reset or abort. | |
1da177e4 LT |
859 | * Note that there are rare cases involving driver generated requests |
860 | * (such as task management requests) that the mid layer may think we | |
861 | * can handle more requests (can_queue) when we actually can't | |
862 | */ | |
cefbda2d | 863 | if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) { |
f3a9c4d7 | 864 | srp_req = 1; |
cefbda2d DB |
865 | request_status = |
866 | atomic_dec_if_positive(&hostdata->request_limit); | |
867 | /* If request limit was -1 when we started, it is now even | |
868 | * less than that | |
869 | */ | |
870 | if (request_status < -1) | |
871 | goto send_error; | |
a897ff2a | 872 | /* Otherwise, we may have run out of requests. */ |
3c887e8a RJ |
873 | /* If request limit was 0 when we started the adapter is in the |
874 | * process of performing a login with the server adapter, or | |
875 | * we may have run out of requests. | |
876 | */ | |
877 | else if (request_status == -1 && | |
878 | evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ) | |
879 | goto send_busy; | |
a897ff2a RJ |
880 | /* Abort and reset calls should make it through. |
881 | * Nothing except abort and reset should use the last two | |
882 | * slots unless we had two or less to begin with. | |
883 | */ | |
884 | else if (request_status < 2 && | |
885 | evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) { | |
886 | /* In the case that we have less than two requests | |
887 | * available, check the server limit as a combination | |
888 | * of the request limit and the number of requests | |
889 | * in-flight (the size of the send list). If the | |
890 | * server limit is greater than 2, return busy so | |
891 | * that the last two are reserved for reset and abort. | |
892 | */ | |
893 | int server_limit = request_status; | |
894 | struct srp_event_struct *tmp_evt; | |
895 | ||
896 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
897 | server_limit++; | |
898 | } | |
899 | ||
900 | if (server_limit > 2) | |
901 | goto send_busy; | |
902 | } | |
cefbda2d | 903 | } |
1da177e4 LT |
904 | |
905 | /* Copy the IU into the transfer area */ | |
906 | *evt_struct->xfer_iu = evt_struct->iu; | |
ef265673 | 907 | evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct; |
1da177e4 LT |
908 | |
909 | /* Add this to the sent list. We need to do this | |
910 | * before we actually send | |
911 | * in case it comes back REALLY fast | |
912 | */ | |
913 | list_add_tail(&evt_struct->list, &hostdata->sent); | |
914 | ||
3d0e91f7 BK |
915 | init_timer(&evt_struct->timer); |
916 | if (timeout) { | |
917 | evt_struct->timer.data = (unsigned long) evt_struct; | |
918 | evt_struct->timer.expires = jiffies + (timeout * HZ); | |
919 | evt_struct->timer.function = (void (*)(unsigned long))ibmvscsi_timeout; | |
920 | add_timer(&evt_struct->timer); | |
921 | } | |
922 | ||
1da177e4 | 923 | if ((rc = |
9965c2f1 | 924 | ibmvscsi_send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) { |
1da177e4 | 925 | list_del(&evt_struct->list); |
3d0e91f7 | 926 | del_timer(&evt_struct->timer); |
1da177e4 | 927 | |
860784c8 RJ |
928 | /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY. |
929 | * Firmware will send a CRQ with a transport event (0xFF) to | |
930 | * tell this client what has happened to the transport. This | |
931 | * will be handled in ibmvscsi_handle_crq() | |
932 | */ | |
933 | if (rc == H_CLOSED) { | |
934 | dev_warn(hostdata->dev, "send warning. " | |
935 | "Receive queue closed, will retry.\n"); | |
936 | goto send_busy; | |
937 | } | |
6c0a60ec | 938 | dev_err(hostdata->dev, "send error %d\n", rc); |
f3a9c4d7 BK |
939 | if (srp_req) |
940 | atomic_inc(&hostdata->request_limit); | |
1da177e4 LT |
941 | goto send_error; |
942 | } | |
943 | ||
944 | return 0; | |
945 | ||
cefbda2d | 946 | send_busy: |
4dddbc26 | 947 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); |
1da177e4 | 948 | |
1da177e4 | 949 | free_event_struct(&hostdata->pool, evt_struct); |
f3a9c4d7 | 950 | if (srp_req && request_status != -1) |
3c887e8a | 951 | atomic_inc(&hostdata->request_limit); |
a897ff2a | 952 | return SCSI_MLQUEUE_HOST_BUSY; |
cefbda2d DB |
953 | |
954 | send_error: | |
955 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); | |
956 | ||
957 | if (evt_struct->cmnd != NULL) { | |
958 | evt_struct->cmnd->result = DID_ERROR << 16; | |
959 | evt_struct->cmnd_done(evt_struct->cmnd); | |
960 | } else if (evt_struct->done) | |
961 | evt_struct->done(evt_struct); | |
962 | ||
963 | free_event_struct(&hostdata->pool, evt_struct); | |
964 | return 0; | |
1da177e4 LT |
965 | } |
966 | ||
967 | /** | |
968 | * handle_cmd_rsp: - Handle responses from commands | |
969 | * @evt_struct: srp_event_struct to be handled | |
970 | * | |
971 | * Used as a callback by when sending scsi cmds. | |
972 | * Gets called by ibmvscsi_handle_crq() | |
973 | */ | |
974 | static void handle_cmd_rsp(struct srp_event_struct *evt_struct) | |
975 | { | |
976 | struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp; | |
977 | struct scsi_cmnd *cmnd = evt_struct->cmnd; | |
978 | ||
ef265673 | 979 | if (unlikely(rsp->opcode != SRP_RSP)) { |
1da177e4 | 980 | if (printk_ratelimit()) |
6c0a60ec BK |
981 | dev_warn(evt_struct->hostdata->dev, |
982 | "bad SRP RSP type %d\n", rsp->opcode); | |
1da177e4 LT |
983 | } |
984 | ||
985 | if (cmnd) { | |
c3a3b55a | 986 | cmnd->result |= rsp->status; |
1da177e4 LT |
987 | if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION) |
988 | memcpy(cmnd->sense_buffer, | |
ef265673 FT |
989 | rsp->data, |
990 | rsp->sense_data_len); | |
1da177e4 | 991 | unmap_cmd_data(&evt_struct->iu.srp.cmd, |
4dddbc26 | 992 | evt_struct, |
1da177e4 LT |
993 | evt_struct->hostdata->dev); |
994 | ||
ef265673 | 995 | if (rsp->flags & SRP_RSP_FLAG_DOOVER) |
9413d7b8 | 996 | scsi_set_resid(cmnd, rsp->data_out_res_cnt); |
ef265673 | 997 | else if (rsp->flags & SRP_RSP_FLAG_DIOVER) |
9413d7b8 | 998 | scsi_set_resid(cmnd, rsp->data_in_res_cnt); |
1da177e4 LT |
999 | } |
1000 | ||
1001 | if (evt_struct->cmnd_done) | |
1002 | evt_struct->cmnd_done(cmnd); | |
1003 | } | |
1004 | ||
1005 | /** | |
1006 | * lun_from_dev: - Returns the lun of the scsi device | |
1007 | * @dev: struct scsi_device | |
1008 | * | |
1009 | */ | |
1010 | static inline u16 lun_from_dev(struct scsi_device *dev) | |
1011 | { | |
1012 | return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun; | |
1013 | } | |
1014 | ||
1015 | /** | |
1016 | * ibmvscsi_queue: - The queuecommand function of the scsi template | |
1017 | * @cmd: struct scsi_cmnd to be executed | |
1018 | * @done: Callback function to be called when cmd is completed | |
1019 | */ | |
f281233d | 1020 | static int ibmvscsi_queuecommand_lck(struct scsi_cmnd *cmnd, |
1da177e4 LT |
1021 | void (*done) (struct scsi_cmnd *)) |
1022 | { | |
1023 | struct srp_cmd *srp_cmd; | |
1024 | struct srp_event_struct *evt_struct; | |
ef265673 | 1025 | struct srp_indirect_buf *indirect; |
7603e02e | 1026 | struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host); |
1da177e4 | 1027 | u16 lun = lun_from_dev(cmnd->device); |
ef265673 | 1028 | u8 out_fmt, in_fmt; |
1da177e4 | 1029 | |
c3a3b55a | 1030 | cmnd->result = (DID_OK << 16); |
1da177e4 LT |
1031 | evt_struct = get_event_struct(&hostdata->pool); |
1032 | if (!evt_struct) | |
1033 | return SCSI_MLQUEUE_HOST_BUSY; | |
1034 | ||
1da177e4 LT |
1035 | /* Set up the actual SRP IU */ |
1036 | srp_cmd = &evt_struct->iu.srp.cmd; | |
ef265673 FT |
1037 | memset(srp_cmd, 0x00, SRP_MAX_IU_LEN); |
1038 | srp_cmd->opcode = SRP_CMD; | |
64a87b24 | 1039 | memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb)); |
1da177e4 LT |
1040 | srp_cmd->lun = ((u64) lun) << 48; |
1041 | ||
4dddbc26 | 1042 | if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) { |
7912a0ac RJ |
1043 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
1044 | sdev_printk(KERN_ERR, cmnd->device, | |
1045 | "couldn't convert cmd to srp_cmd\n"); | |
1da177e4 LT |
1046 | free_event_struct(&hostdata->pool, evt_struct); |
1047 | return SCSI_MLQUEUE_HOST_BUSY; | |
1048 | } | |
1049 | ||
4dddbc26 JB |
1050 | init_event_struct(evt_struct, |
1051 | handle_cmd_rsp, | |
1052 | VIOSRP_SRP_FORMAT, | |
242f9dcb | 1053 | cmnd->request->timeout/HZ); |
4dddbc26 JB |
1054 | |
1055 | evt_struct->cmnd = cmnd; | |
1056 | evt_struct->cmnd_done = done; | |
1057 | ||
1da177e4 | 1058 | /* Fix up dma address of the buffer itself */ |
ef265673 FT |
1059 | indirect = (struct srp_indirect_buf *) srp_cmd->add_data; |
1060 | out_fmt = srp_cmd->buf_fmt >> 4; | |
1061 | in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1); | |
1062 | if ((in_fmt == SRP_DATA_DESC_INDIRECT || | |
1063 | out_fmt == SRP_DATA_DESC_INDIRECT) && | |
1064 | indirect->table_desc.va == 0) { | |
1065 | indirect->table_desc.va = evt_struct->crq.IU_data_ptr + | |
1066 | offsetof(struct srp_cmd, add_data) + | |
1067 | offsetof(struct srp_indirect_buf, desc_list); | |
1da177e4 LT |
1068 | } |
1069 | ||
3d0e91f7 | 1070 | return ibmvscsi_send_srp_event(evt_struct, hostdata, 0); |
1da177e4 LT |
1071 | } |
1072 | ||
f281233d JG |
1073 | static DEF_SCSI_QCMD(ibmvscsi_queuecommand) |
1074 | ||
1da177e4 LT |
1075 | /* ------------------------------------------------------------ |
1076 | * Routines for driver initialization | |
1077 | */ | |
3507e13f | 1078 | |
126c5cc3 BK |
1079 | /** |
1080 | * map_persist_bufs: - Pre-map persistent data for adapter logins | |
1081 | * @hostdata: ibmvscsi_host_data of host | |
1082 | * | |
1083 | * Map the capabilities and adapter info DMA buffers to avoid runtime failures. | |
1084 | * Return 1 on error, 0 on success. | |
1085 | */ | |
1086 | static int map_persist_bufs(struct ibmvscsi_host_data *hostdata) | |
1087 | { | |
1088 | ||
1089 | hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps, | |
1090 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
1091 | ||
1092 | if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) { | |
1093 | dev_err(hostdata->dev, "Unable to map capabilities buffer!\n"); | |
1094 | return 1; | |
1095 | } | |
1096 | ||
1097 | hostdata->adapter_info_addr = dma_map_single(hostdata->dev, | |
1098 | &hostdata->madapter_info, | |
1099 | sizeof(hostdata->madapter_info), | |
1100 | DMA_BIDIRECTIONAL); | |
1101 | if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) { | |
1102 | dev_err(hostdata->dev, "Unable to map adapter info buffer!\n"); | |
1103 | dma_unmap_single(hostdata->dev, hostdata->caps_addr, | |
1104 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
1105 | return 1; | |
1106 | } | |
1107 | ||
1108 | return 0; | |
1109 | } | |
1110 | ||
1111 | /** | |
1112 | * unmap_persist_bufs: - Unmap persistent data needed for adapter logins | |
1113 | * @hostdata: ibmvscsi_host_data of host | |
1114 | * | |
1115 | * Unmap the capabilities and adapter info DMA buffers | |
1116 | */ | |
1117 | static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata) | |
1118 | { | |
1119 | dma_unmap_single(hostdata->dev, hostdata->caps_addr, | |
1120 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
1121 | ||
1122 | dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr, | |
1123 | sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL); | |
1124 | } | |
1125 | ||
3507e13f BK |
1126 | /** |
1127 | * login_rsp: - Handle response to SRP login request | |
1128 | * @evt_struct: srp_event_struct with the response | |
1129 | * | |
1130 | * Used as a "done" callback by when sending srp_login. Gets called | |
1131 | * by ibmvscsi_handle_crq() | |
1132 | */ | |
1133 | static void login_rsp(struct srp_event_struct *evt_struct) | |
1134 | { | |
1135 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
1136 | switch (evt_struct->xfer_iu->srp.login_rsp.opcode) { | |
1137 | case SRP_LOGIN_RSP: /* it worked! */ | |
1138 | break; | |
1139 | case SRP_LOGIN_REJ: /* refused! */ | |
1140 | dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n", | |
1141 | evt_struct->xfer_iu->srp.login_rej.reason); | |
1142 | /* Login failed. */ | |
1143 | atomic_set(&hostdata->request_limit, -1); | |
1144 | return; | |
1145 | default: | |
1146 | dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n", | |
1147 | evt_struct->xfer_iu->srp.login_rsp.opcode); | |
1148 | /* Login failed. */ | |
1149 | atomic_set(&hostdata->request_limit, -1); | |
1150 | return; | |
1151 | } | |
1152 | ||
1153 | dev_info(hostdata->dev, "SRP_LOGIN succeeded\n"); | |
126c5cc3 | 1154 | hostdata->client_migrated = 0; |
3507e13f BK |
1155 | |
1156 | /* Now we know what the real request-limit is. | |
1157 | * This value is set rather than added to request_limit because | |
1158 | * request_limit could have been set to -1 by this client. | |
1159 | */ | |
1160 | atomic_set(&hostdata->request_limit, | |
1161 | evt_struct->xfer_iu->srp.login_rsp.req_lim_delta); | |
1162 | ||
1163 | /* If we had any pending I/Os, kick them */ | |
1164 | scsi_unblock_requests(hostdata->host); | |
1165 | } | |
1166 | ||
1167 | /** | |
1168 | * send_srp_login: - Sends the srp login | |
1169 | * @hostdata: ibmvscsi_host_data of host | |
1170 | * | |
1171 | * Returns zero if successful. | |
1172 | */ | |
1173 | static int send_srp_login(struct ibmvscsi_host_data *hostdata) | |
1174 | { | |
1175 | int rc; | |
1176 | unsigned long flags; | |
1177 | struct srp_login_req *login; | |
1178 | struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool); | |
1179 | ||
1180 | BUG_ON(!evt_struct); | |
1181 | init_event_struct(evt_struct, login_rsp, | |
1182 | VIOSRP_SRP_FORMAT, login_timeout); | |
1183 | ||
1184 | login = &evt_struct->iu.srp.login_req; | |
1185 | memset(login, 0, sizeof(*login)); | |
1186 | login->opcode = SRP_LOGIN_REQ; | |
1187 | login->req_it_iu_len = sizeof(union srp_iu); | |
1188 | login->req_buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT; | |
1189 | ||
1190 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1191 | /* Start out with a request limit of 0, since this is negotiated in | |
1192 | * the login request we are just sending and login requests always | |
1193 | * get sent by the driver regardless of request_limit. | |
1194 | */ | |
1195 | atomic_set(&hostdata->request_limit, 0); | |
1196 | ||
1197 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2); | |
1198 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1199 | dev_info(hostdata->dev, "sent SRP login\n"); | |
1200 | return rc; | |
1201 | }; | |
1202 | ||
126c5cc3 BK |
1203 | /** |
1204 | * capabilities_rsp: - Handle response to MAD adapter capabilities request | |
1205 | * @evt_struct: srp_event_struct with the response | |
1206 | * | |
1207 | * Used as a "done" callback by when sending adapter_info. | |
1208 | */ | |
1209 | static void capabilities_rsp(struct srp_event_struct *evt_struct) | |
1210 | { | |
1211 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
1212 | ||
1213 | if (evt_struct->xfer_iu->mad.capabilities.common.status) { | |
1214 | dev_err(hostdata->dev, "error 0x%X getting capabilities info\n", | |
1215 | evt_struct->xfer_iu->mad.capabilities.common.status); | |
1216 | } else { | |
1217 | if (hostdata->caps.migration.common.server_support != SERVER_SUPPORTS_CAP) | |
1218 | dev_info(hostdata->dev, "Partition migration not supported\n"); | |
1219 | ||
1220 | if (client_reserve) { | |
1221 | if (hostdata->caps.reserve.common.server_support == | |
1222 | SERVER_SUPPORTS_CAP) | |
1223 | dev_info(hostdata->dev, "Client reserve enabled\n"); | |
1224 | else | |
1225 | dev_info(hostdata->dev, "Client reserve not supported\n"); | |
1226 | } | |
1227 | } | |
1228 | ||
1229 | send_srp_login(hostdata); | |
1230 | } | |
1231 | ||
1232 | /** | |
1233 | * send_mad_capabilities: - Sends the mad capabilities request | |
1234 | * and stores the result so it can be retrieved with | |
1235 | * @hostdata: ibmvscsi_host_data of host | |
1236 | */ | |
1237 | static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata) | |
1238 | { | |
1239 | struct viosrp_capabilities *req; | |
1240 | struct srp_event_struct *evt_struct; | |
1241 | unsigned long flags; | |
61c7a080 | 1242 | struct device_node *of_node = hostdata->dev->of_node; |
126c5cc3 BK |
1243 | const char *location; |
1244 | ||
1245 | evt_struct = get_event_struct(&hostdata->pool); | |
1246 | BUG_ON(!evt_struct); | |
1247 | ||
1248 | init_event_struct(evt_struct, capabilities_rsp, | |
1249 | VIOSRP_MAD_FORMAT, info_timeout); | |
1250 | ||
1251 | req = &evt_struct->iu.mad.capabilities; | |
1252 | memset(req, 0, sizeof(*req)); | |
1253 | ||
1254 | hostdata->caps.flags = CAP_LIST_SUPPORTED; | |
1255 | if (hostdata->client_migrated) | |
1256 | hostdata->caps.flags |= CLIENT_MIGRATED; | |
1257 | ||
1258 | strncpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev), | |
1259 | sizeof(hostdata->caps.name)); | |
1260 | hostdata->caps.name[sizeof(hostdata->caps.name) - 1] = '\0'; | |
1261 | ||
1262 | location = of_get_property(of_node, "ibm,loc-code", NULL); | |
1263 | location = location ? location : dev_name(hostdata->dev); | |
1264 | strncpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc)); | |
1265 | hostdata->caps.loc[sizeof(hostdata->caps.loc) - 1] = '\0'; | |
1266 | ||
1267 | req->common.type = VIOSRP_CAPABILITIES_TYPE; | |
1268 | req->buffer = hostdata->caps_addr; | |
1269 | ||
1270 | hostdata->caps.migration.common.cap_type = MIGRATION_CAPABILITIES; | |
1271 | hostdata->caps.migration.common.length = sizeof(hostdata->caps.migration); | |
1272 | hostdata->caps.migration.common.server_support = SERVER_SUPPORTS_CAP; | |
1273 | hostdata->caps.migration.ecl = 1; | |
1274 | ||
1275 | if (client_reserve) { | |
1276 | hostdata->caps.reserve.common.cap_type = RESERVATION_CAPABILITIES; | |
1277 | hostdata->caps.reserve.common.length = sizeof(hostdata->caps.reserve); | |
1278 | hostdata->caps.reserve.common.server_support = SERVER_SUPPORTS_CAP; | |
1279 | hostdata->caps.reserve.type = CLIENT_RESERVE_SCSI_2; | |
1280 | req->common.length = sizeof(hostdata->caps); | |
1281 | } else | |
1282 | req->common.length = sizeof(hostdata->caps) - sizeof(hostdata->caps.reserve); | |
1283 | ||
1284 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1285 | if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) | |
1286 | dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n"); | |
1287 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1288 | }; | |
1289 | ||
c1988e31 RJ |
1290 | /** |
1291 | * fast_fail_rsp: - Handle response to MAD enable fast fail | |
1292 | * @evt_struct: srp_event_struct with the response | |
1293 | * | |
1294 | * Used as a "done" callback by when sending enable fast fail. Gets called | |
1295 | * by ibmvscsi_handle_crq() | |
1296 | */ | |
1297 | static void fast_fail_rsp(struct srp_event_struct *evt_struct) | |
1298 | { | |
1299 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
1300 | u8 status = evt_struct->xfer_iu->mad.fast_fail.common.status; | |
1301 | ||
1302 | if (status == VIOSRP_MAD_NOT_SUPPORTED) | |
1303 | dev_err(hostdata->dev, "fast_fail not supported in server\n"); | |
1304 | else if (status == VIOSRP_MAD_FAILED) | |
1305 | dev_err(hostdata->dev, "fast_fail request failed\n"); | |
1306 | else if (status != VIOSRP_MAD_SUCCESS) | |
1307 | dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status); | |
1308 | ||
126c5cc3 | 1309 | send_mad_capabilities(hostdata); |
c1988e31 RJ |
1310 | } |
1311 | ||
1312 | /** | |
1313 | * init_host - Start host initialization | |
1314 | * @hostdata: ibmvscsi_host_data of host | |
1315 | * | |
1316 | * Returns zero if successful. | |
1317 | */ | |
1318 | static int enable_fast_fail(struct ibmvscsi_host_data *hostdata) | |
1319 | { | |
1320 | int rc; | |
1321 | unsigned long flags; | |
1322 | struct viosrp_fast_fail *fast_fail_mad; | |
1323 | struct srp_event_struct *evt_struct; | |
1324 | ||
126c5cc3 BK |
1325 | if (!fast_fail) { |
1326 | send_mad_capabilities(hostdata); | |
1327 | return 0; | |
1328 | } | |
c1988e31 RJ |
1329 | |
1330 | evt_struct = get_event_struct(&hostdata->pool); | |
1331 | BUG_ON(!evt_struct); | |
1332 | ||
1333 | init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout); | |
1334 | ||
1335 | fast_fail_mad = &evt_struct->iu.mad.fast_fail; | |
1336 | memset(fast_fail_mad, 0, sizeof(*fast_fail_mad)); | |
1337 | fast_fail_mad->common.type = VIOSRP_ENABLE_FAST_FAIL; | |
1338 | fast_fail_mad->common.length = sizeof(*fast_fail_mad); | |
1339 | ||
1340 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1341 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2); | |
1342 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1343 | return rc; | |
1344 | } | |
1345 | ||
1da177e4 LT |
1346 | /** |
1347 | * adapter_info_rsp: - Handle response to MAD adapter info request | |
1348 | * @evt_struct: srp_event_struct with the response | |
1349 | * | |
1350 | * Used as a "done" callback by when sending adapter_info. Gets called | |
1351 | * by ibmvscsi_handle_crq() | |
1352 | */ | |
1353 | static void adapter_info_rsp(struct srp_event_struct *evt_struct) | |
1354 | { | |
1355 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
1da177e4 LT |
1356 | |
1357 | if (evt_struct->xfer_iu->mad.adapter_info.common.status) { | |
6c0a60ec BK |
1358 | dev_err(hostdata->dev, "error %d getting adapter info\n", |
1359 | evt_struct->xfer_iu->mad.adapter_info.common.status); | |
1da177e4 | 1360 | } else { |
6c0a60ec BK |
1361 | dev_info(hostdata->dev, "host srp version: %s, " |
1362 | "host partition %s (%d), OS %d, max io %u\n", | |
1363 | hostdata->madapter_info.srp_version, | |
1364 | hostdata->madapter_info.partition_name, | |
1365 | hostdata->madapter_info.partition_number, | |
1366 | hostdata->madapter_info.os_type, | |
1367 | hostdata->madapter_info.port_max_txu[0]); | |
1da177e4 LT |
1368 | |
1369 | if (hostdata->madapter_info.port_max_txu[0]) | |
1370 | hostdata->host->max_sectors = | |
1371 | hostdata->madapter_info.port_max_txu[0] >> 9; | |
154fb614 DB |
1372 | |
1373 | if (hostdata->madapter_info.os_type == 3 && | |
1374 | strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) { | |
6c0a60ec BK |
1375 | dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n", |
1376 | hostdata->madapter_info.srp_version); | |
1377 | dev_err(hostdata->dev, "limiting scatterlists to %d\n", | |
1378 | MAX_INDIRECT_BUFS); | |
154fb614 DB |
1379 | hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS; |
1380 | } | |
e08afeb7 BK |
1381 | |
1382 | if (hostdata->madapter_info.os_type == 3) { | |
1383 | enable_fast_fail(hostdata); | |
1384 | return; | |
1385 | } | |
1da177e4 | 1386 | } |
3507e13f | 1387 | |
e08afeb7 | 1388 | send_srp_login(hostdata); |
1da177e4 LT |
1389 | } |
1390 | ||
1391 | /** | |
1392 | * send_mad_adapter_info: - Sends the mad adapter info request | |
1393 | * and stores the result so it can be retrieved with | |
1394 | * sysfs. We COULD consider causing a failure if the | |
1395 | * returned SRP version doesn't match ours. | |
1396 | * @hostdata: ibmvscsi_host_data of host | |
1397 | * | |
1398 | * Returns zero if successful. | |
1399 | */ | |
1400 | static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata) | |
1401 | { | |
1402 | struct viosrp_adapter_info *req; | |
1403 | struct srp_event_struct *evt_struct; | |
06f923cb | 1404 | unsigned long flags; |
e5dbfa66 | 1405 | |
1da177e4 | 1406 | evt_struct = get_event_struct(&hostdata->pool); |
3507e13f | 1407 | BUG_ON(!evt_struct); |
1da177e4 LT |
1408 | |
1409 | init_event_struct(evt_struct, | |
1410 | adapter_info_rsp, | |
1411 | VIOSRP_MAD_FORMAT, | |
e1a5ce5b | 1412 | info_timeout); |
1da177e4 LT |
1413 | |
1414 | req = &evt_struct->iu.mad.adapter_info; | |
1415 | memset(req, 0x00, sizeof(*req)); | |
1416 | ||
1417 | req->common.type = VIOSRP_ADAPTER_INFO_TYPE; | |
1418 | req->common.length = sizeof(hostdata->madapter_info); | |
126c5cc3 | 1419 | req->buffer = hostdata->adapter_info_addr; |
1da177e4 | 1420 | |
06f923cb | 1421 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
126c5cc3 | 1422 | if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) |
6c0a60ec | 1423 | dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n"); |
06f923cb | 1424 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1425 | }; |
1426 | ||
1427 | /** | |
3507e13f | 1428 | * init_adapter: Start virtual adapter initialization sequence |
1da177e4 | 1429 | * |
3507e13f BK |
1430 | */ |
1431 | static void init_adapter(struct ibmvscsi_host_data *hostdata) | |
1da177e4 | 1432 | { |
1da177e4 | 1433 | send_mad_adapter_info(hostdata); |
1da177e4 LT |
1434 | } |
1435 | ||
1da177e4 LT |
1436 | /** |
1437 | * sync_completion: Signal that a synchronous command has completed | |
1438 | * Note that after returning from this call, the evt_struct is freed. | |
1439 | * the caller waiting on this completion shouldn't touch the evt_struct | |
1440 | * again. | |
1441 | */ | |
1442 | static void sync_completion(struct srp_event_struct *evt_struct) | |
1443 | { | |
1444 | /* copy the response back */ | |
1445 | if (evt_struct->sync_srp) | |
1446 | *evt_struct->sync_srp = *evt_struct->xfer_iu; | |
1447 | ||
1448 | complete(&evt_struct->comp); | |
1449 | } | |
1450 | ||
1451 | /** | |
1452 | * ibmvscsi_abort: Abort a command...from scsi host template | |
1453 | * send this over to the server and wait synchronously for the response | |
1454 | */ | |
1455 | static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd) | |
1456 | { | |
7603e02e | 1457 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 LT |
1458 | struct srp_tsk_mgmt *tsk_mgmt; |
1459 | struct srp_event_struct *evt; | |
1460 | struct srp_event_struct *tmp_evt, *found_evt; | |
1461 | union viosrp_iu srp_rsp; | |
1462 | int rsp_rc; | |
be042f24 | 1463 | unsigned long flags; |
1da177e4 | 1464 | u16 lun = lun_from_dev(cmd->device); |
860784c8 | 1465 | unsigned long wait_switch = 0; |
1da177e4 LT |
1466 | |
1467 | /* First, find this command in our sent list so we can figure | |
1468 | * out the correct tag | |
1469 | */ | |
be042f24 | 1470 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
860784c8 RJ |
1471 | wait_switch = jiffies + (init_timeout * HZ); |
1472 | do { | |
1473 | found_evt = NULL; | |
1474 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
1475 | if (tmp_evt->cmnd == cmd) { | |
1476 | found_evt = tmp_evt; | |
1477 | break; | |
1478 | } | |
1da177e4 | 1479 | } |
1da177e4 | 1480 | |
860784c8 RJ |
1481 | if (!found_evt) { |
1482 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1483 | return SUCCESS; | |
1484 | } | |
1da177e4 | 1485 | |
860784c8 RJ |
1486 | evt = get_event_struct(&hostdata->pool); |
1487 | if (evt == NULL) { | |
1488 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1489 | sdev_printk(KERN_ERR, cmd->device, | |
1490 | "failed to allocate abort event\n"); | |
1491 | return FAILED; | |
1492 | } | |
1da177e4 | 1493 | |
860784c8 RJ |
1494 | init_event_struct(evt, |
1495 | sync_completion, | |
1496 | VIOSRP_SRP_FORMAT, | |
e1a5ce5b | 1497 | abort_timeout); |
1da177e4 | 1498 | |
860784c8 | 1499 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
1da177e4 | 1500 | |
860784c8 RJ |
1501 | /* Set up an abort SRP command */ |
1502 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
1503 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
1504 | tsk_mgmt->lun = ((u64) lun) << 48; | |
1505 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK; | |
1506 | tsk_mgmt->task_tag = (u64) found_evt; | |
1507 | ||
1508 | evt->sync_srp = &srp_rsp; | |
1509 | ||
1510 | init_completion(&evt->comp); | |
e1a5ce5b | 1511 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2); |
860784c8 RJ |
1512 | |
1513 | if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) | |
1514 | break; | |
1515 | ||
1516 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1517 | msleep(10); | |
1518 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1519 | } while (time_before(jiffies, wait_switch)); | |
1520 | ||
be042f24 | 1521 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
860784c8 | 1522 | |
be042f24 | 1523 | if (rsp_rc != 0) { |
6c0a60ec BK |
1524 | sdev_printk(KERN_ERR, cmd->device, |
1525 | "failed to send abort() event. rc=%d\n", rsp_rc); | |
1da177e4 LT |
1526 | return FAILED; |
1527 | } | |
1528 | ||
860784c8 | 1529 | sdev_printk(KERN_INFO, cmd->device, |
fe333321 | 1530 | "aborting command. lun 0x%llx, tag 0x%llx\n", |
860784c8 RJ |
1531 | (((u64) lun) << 48), (u64) found_evt); |
1532 | ||
1da177e4 | 1533 | wait_for_completion(&evt->comp); |
1da177e4 LT |
1534 | |
1535 | /* make sure we got a good response */ | |
ef265673 | 1536 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 | 1537 | if (printk_ratelimit()) |
6c0a60ec BK |
1538 | sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n", |
1539 | srp_rsp.srp.rsp.opcode); | |
1da177e4 LT |
1540 | return FAILED; |
1541 | } | |
1542 | ||
ef265673 FT |
1543 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1544 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1545 | else |
1546 | rsp_rc = srp_rsp.srp.rsp.status; | |
1547 | ||
1548 | if (rsp_rc) { | |
1549 | if (printk_ratelimit()) | |
6c0a60ec | 1550 | sdev_printk(KERN_WARNING, cmd->device, |
fe333321 | 1551 | "abort code %d for task tag 0x%llx\n", |
6c0a60ec | 1552 | rsp_rc, tsk_mgmt->task_tag); |
1da177e4 LT |
1553 | return FAILED; |
1554 | } | |
1555 | ||
1556 | /* Because we dropped the spinlock above, it's possible | |
1557 | * The event is no longer in our list. Make sure it didn't | |
1558 | * complete while we were aborting | |
1559 | */ | |
be042f24 | 1560 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1561 | found_evt = NULL; |
1562 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
1563 | if (tmp_evt->cmnd == cmd) { | |
1564 | found_evt = tmp_evt; | |
1565 | break; | |
1566 | } | |
1567 | } | |
1568 | ||
1569 | if (found_evt == NULL) { | |
be042f24 | 1570 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
fe333321 | 1571 | sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n", |
6c0a60ec | 1572 | tsk_mgmt->task_tag); |
1da177e4 LT |
1573 | return SUCCESS; |
1574 | } | |
1575 | ||
fe333321 | 1576 | sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n", |
6c0a60ec | 1577 | tsk_mgmt->task_tag); |
1da177e4 LT |
1578 | |
1579 | cmd->result = (DID_ABORT << 16); | |
1580 | list_del(&found_evt->list); | |
4dddbc26 JB |
1581 | unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt, |
1582 | found_evt->hostdata->dev); | |
1da177e4 | 1583 | free_event_struct(&found_evt->hostdata->pool, found_evt); |
be042f24 | 1584 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1585 | atomic_inc(&hostdata->request_limit); |
1586 | return SUCCESS; | |
1587 | } | |
1588 | ||
1589 | /** | |
1590 | * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host | |
1591 | * template send this over to the server and wait synchronously for the | |
1592 | * response | |
1593 | */ | |
1594 | static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd) | |
1595 | { | |
7603e02e | 1596 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 LT |
1597 | struct srp_tsk_mgmt *tsk_mgmt; |
1598 | struct srp_event_struct *evt; | |
1599 | struct srp_event_struct *tmp_evt, *pos; | |
1600 | union viosrp_iu srp_rsp; | |
1601 | int rsp_rc; | |
be042f24 | 1602 | unsigned long flags; |
1da177e4 | 1603 | u16 lun = lun_from_dev(cmd->device); |
860784c8 | 1604 | unsigned long wait_switch = 0; |
1da177e4 | 1605 | |
be042f24 | 1606 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
860784c8 RJ |
1607 | wait_switch = jiffies + (init_timeout * HZ); |
1608 | do { | |
1609 | evt = get_event_struct(&hostdata->pool); | |
1610 | if (evt == NULL) { | |
1611 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1612 | sdev_printk(KERN_ERR, cmd->device, | |
1613 | "failed to allocate reset event\n"); | |
1614 | return FAILED; | |
1615 | } | |
1da177e4 | 1616 | |
860784c8 RJ |
1617 | init_event_struct(evt, |
1618 | sync_completion, | |
1619 | VIOSRP_SRP_FORMAT, | |
e1a5ce5b | 1620 | reset_timeout); |
1da177e4 | 1621 | |
860784c8 | 1622 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
1da177e4 | 1623 | |
860784c8 RJ |
1624 | /* Set up a lun reset SRP command */ |
1625 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
1626 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
1627 | tsk_mgmt->lun = ((u64) lun) << 48; | |
1628 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET; | |
1da177e4 | 1629 | |
860784c8 RJ |
1630 | evt->sync_srp = &srp_rsp; |
1631 | ||
1632 | init_completion(&evt->comp); | |
e1a5ce5b | 1633 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2); |
860784c8 RJ |
1634 | |
1635 | if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) | |
1636 | break; | |
1637 | ||
1638 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1639 | msleep(10); | |
1640 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1641 | } while (time_before(jiffies, wait_switch)); | |
1da177e4 | 1642 | |
be042f24 | 1643 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
860784c8 | 1644 | |
be042f24 | 1645 | if (rsp_rc != 0) { |
6c0a60ec BK |
1646 | sdev_printk(KERN_ERR, cmd->device, |
1647 | "failed to send reset event. rc=%d\n", rsp_rc); | |
1da177e4 LT |
1648 | return FAILED; |
1649 | } | |
1650 | ||
fe333321 | 1651 | sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n", |
860784c8 RJ |
1652 | (((u64) lun) << 48)); |
1653 | ||
1da177e4 | 1654 | wait_for_completion(&evt->comp); |
1da177e4 LT |
1655 | |
1656 | /* make sure we got a good response */ | |
ef265673 | 1657 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 | 1658 | if (printk_ratelimit()) |
6c0a60ec BK |
1659 | sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n", |
1660 | srp_rsp.srp.rsp.opcode); | |
1da177e4 LT |
1661 | return FAILED; |
1662 | } | |
1663 | ||
ef265673 FT |
1664 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1665 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1666 | else |
1667 | rsp_rc = srp_rsp.srp.rsp.status; | |
1668 | ||
1669 | if (rsp_rc) { | |
1670 | if (printk_ratelimit()) | |
6c0a60ec | 1671 | sdev_printk(KERN_WARNING, cmd->device, |
fe333321 | 1672 | "reset code %d for task tag 0x%llx\n", |
6c0a60ec | 1673 | rsp_rc, tsk_mgmt->task_tag); |
1da177e4 LT |
1674 | return FAILED; |
1675 | } | |
1676 | ||
1677 | /* We need to find all commands for this LUN that have not yet been | |
1678 | * responded to, and fail them with DID_RESET | |
1679 | */ | |
be042f24 | 1680 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1681 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { |
1682 | if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) { | |
1683 | if (tmp_evt->cmnd) | |
1684 | tmp_evt->cmnd->result = (DID_RESET << 16); | |
1685 | list_del(&tmp_evt->list); | |
4dddbc26 JB |
1686 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt, |
1687 | tmp_evt->hostdata->dev); | |
1da177e4 LT |
1688 | free_event_struct(&tmp_evt->hostdata->pool, |
1689 | tmp_evt); | |
1690 | atomic_inc(&hostdata->request_limit); | |
1691 | if (tmp_evt->cmnd_done) | |
1692 | tmp_evt->cmnd_done(tmp_evt->cmnd); | |
1693 | else if (tmp_evt->done) | |
1694 | tmp_evt->done(tmp_evt); | |
1695 | } | |
1696 | } | |
be042f24 | 1697 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1698 | return SUCCESS; |
1699 | } | |
1700 | ||
1701 | /** | |
3d0e91f7 BK |
1702 | * ibmvscsi_eh_host_reset_handler - Reset the connection to the server |
1703 | * @cmd: struct scsi_cmnd having problems | |
1704 | */ | |
1705 | static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd) | |
1da177e4 | 1706 | { |
3d0e91f7 | 1707 | unsigned long wait_switch = 0; |
7603e02e | 1708 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 | 1709 | |
3d0e91f7 BK |
1710 | dev_err(hostdata->dev, "Resetting connection due to error recovery\n"); |
1711 | ||
1712 | ibmvscsi_reset_host(hostdata); | |
1713 | ||
1714 | for (wait_switch = jiffies + (init_timeout * HZ); | |
1715 | time_before(jiffies, wait_switch) && | |
1716 | atomic_read(&hostdata->request_limit) < 2;) { | |
1717 | ||
1718 | msleep(10); | |
1da177e4 | 1719 | } |
3d0e91f7 BK |
1720 | |
1721 | if (atomic_read(&hostdata->request_limit) <= 0) | |
1722 | return FAILED; | |
1723 | ||
1724 | return SUCCESS; | |
1da177e4 LT |
1725 | } |
1726 | ||
1727 | /** | |
1728 | * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ | |
1729 | * @crq: Command/Response queue | |
1730 | * @hostdata: ibmvscsi_host_data of host | |
1731 | * | |
1732 | */ | |
9965c2f1 BH |
1733 | static void ibmvscsi_handle_crq(struct viosrp_crq *crq, |
1734 | struct ibmvscsi_host_data *hostdata) | |
1da177e4 | 1735 | { |
6c0a60ec | 1736 | long rc; |
1da177e4 LT |
1737 | unsigned long flags; |
1738 | struct srp_event_struct *evt_struct = | |
1739 | (struct srp_event_struct *)crq->IU_data_ptr; | |
1740 | switch (crq->valid) { | |
1741 | case 0xC0: /* initialization */ | |
1742 | switch (crq->format) { | |
1743 | case 0x01: /* Initialization message */ | |
6c0a60ec | 1744 | dev_info(hostdata->dev, "partner initialized\n"); |
1da177e4 | 1745 | /* Send back a response */ |
9965c2f1 BH |
1746 | rc = ibmvscsi_send_crq(hostdata, 0xC002000000000000LL, 0); |
1747 | if (rc == 0) { | |
1da177e4 | 1748 | /* Now login */ |
3507e13f | 1749 | init_adapter(hostdata); |
1da177e4 | 1750 | } else { |
6c0a60ec | 1751 | dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc); |
1da177e4 LT |
1752 | } |
1753 | ||
1754 | break; | |
1755 | case 0x02: /* Initialization response */ | |
6c0a60ec | 1756 | dev_info(hostdata->dev, "partner initialization complete\n"); |
1da177e4 LT |
1757 | |
1758 | /* Now login */ | |
3507e13f | 1759 | init_adapter(hostdata); |
1da177e4 LT |
1760 | break; |
1761 | default: | |
6c0a60ec | 1762 | dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format); |
1da177e4 LT |
1763 | } |
1764 | return; | |
2b541f8f DB |
1765 | case 0xFF: /* Hypervisor telling us the connection is closed */ |
1766 | scsi_block_requests(hostdata->host); | |
cefbda2d | 1767 | atomic_set(&hostdata->request_limit, 0); |
2b541f8f DB |
1768 | if (crq->format == 0x06) { |
1769 | /* We need to re-setup the interpartition connection */ | |
6c0a60ec | 1770 | dev_info(hostdata->dev, "Re-enabling adapter!\n"); |
126c5cc3 | 1771 | hostdata->client_migrated = 1; |
0f33ece5 | 1772 | hostdata->reenable_crq = 1; |
2b541f8f | 1773 | purge_requests(hostdata, DID_REQUEUE); |
0f33ece5 | 1774 | wake_up(&hostdata->work_wait_q); |
2b541f8f | 1775 | } else { |
6c0a60ec BK |
1776 | dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n", |
1777 | crq->format); | |
0f33ece5 | 1778 | ibmvscsi_reset_host(hostdata); |
2b541f8f | 1779 | } |
1da177e4 LT |
1780 | return; |
1781 | case 0x80: /* real payload */ | |
1782 | break; | |
1783 | default: | |
6c0a60ec BK |
1784 | dev_err(hostdata->dev, "got an invalid message type 0x%02x\n", |
1785 | crq->valid); | |
1da177e4 LT |
1786 | return; |
1787 | } | |
1788 | ||
1789 | /* The only kind of payload CRQs we should get are responses to | |
1790 | * things we send. Make sure this response is to something we | |
1791 | * actually sent | |
1792 | */ | |
1793 | if (!valid_event_struct(&hostdata->pool, evt_struct)) { | |
6c0a60ec | 1794 | dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n", |
1da177e4 LT |
1795 | (void *)crq->IU_data_ptr); |
1796 | return; | |
1797 | } | |
1798 | ||
1799 | if (atomic_read(&evt_struct->free)) { | |
6c0a60ec BK |
1800 | dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n", |
1801 | (void *)crq->IU_data_ptr); | |
1da177e4 LT |
1802 | return; |
1803 | } | |
1804 | ||
1805 | if (crq->format == VIOSRP_SRP_FORMAT) | |
ef265673 | 1806 | atomic_add(evt_struct->xfer_iu->srp.rsp.req_lim_delta, |
1da177e4 LT |
1807 | &hostdata->request_limit); |
1808 | ||
3d0e91f7 BK |
1809 | del_timer(&evt_struct->timer); |
1810 | ||
ca61668b | 1811 | if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd) |
c3a3b55a | 1812 | evt_struct->cmnd->result = DID_ERROR << 16; |
1da177e4 LT |
1813 | if (evt_struct->done) |
1814 | evt_struct->done(evt_struct); | |
1815 | else | |
6c0a60ec | 1816 | dev_err(hostdata->dev, "returned done() is NULL; not running it!\n"); |
1da177e4 LT |
1817 | |
1818 | /* | |
1819 | * Lock the host_lock before messing with these structures, since we | |
1820 | * are running in a task context | |
1821 | */ | |
1822 | spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags); | |
1823 | list_del(&evt_struct->list); | |
1824 | free_event_struct(&evt_struct->hostdata->pool, evt_struct); | |
1825 | spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags); | |
1826 | } | |
1827 | ||
1828 | /** | |
1829 | * ibmvscsi_get_host_config: Send the command to the server to get host | |
1830 | * configuration data. The data is opaque to us. | |
1831 | */ | |
1832 | static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata, | |
1833 | unsigned char *buffer, int length) | |
1834 | { | |
1835 | struct viosrp_host_config *host_config; | |
1836 | struct srp_event_struct *evt_struct; | |
06f923cb | 1837 | unsigned long flags; |
e5dbfa66 | 1838 | dma_addr_t addr; |
1da177e4 LT |
1839 | int rc; |
1840 | ||
1841 | evt_struct = get_event_struct(&hostdata->pool); | |
1842 | if (!evt_struct) { | |
6c0a60ec | 1843 | dev_err(hostdata->dev, "couldn't allocate event for HOST_CONFIG!\n"); |
1da177e4 LT |
1844 | return -1; |
1845 | } | |
1846 | ||
1847 | init_event_struct(evt_struct, | |
1848 | sync_completion, | |
1849 | VIOSRP_MAD_FORMAT, | |
e1a5ce5b | 1850 | info_timeout); |
1da177e4 LT |
1851 | |
1852 | host_config = &evt_struct->iu.mad.host_config; | |
1853 | ||
225c5696 BH |
1854 | /* The transport length field is only 16-bit */ |
1855 | length = min(0xffff, length); | |
1856 | ||
1da177e4 LT |
1857 | /* Set up a lun reset SRP command */ |
1858 | memset(host_config, 0x00, sizeof(*host_config)); | |
1859 | host_config->common.type = VIOSRP_HOST_CONFIG_TYPE; | |
1860 | host_config->common.length = length; | |
e5dbfa66 FT |
1861 | host_config->buffer = addr = dma_map_single(hostdata->dev, buffer, |
1862 | length, | |
1863 | DMA_BIDIRECTIONAL); | |
1da177e4 | 1864 | |
8d8bb39b | 1865 | if (dma_mapping_error(hostdata->dev, host_config->buffer)) { |
7912a0ac RJ |
1866 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
1867 | dev_err(hostdata->dev, | |
1868 | "dma_mapping error getting host config\n"); | |
1da177e4 LT |
1869 | free_event_struct(&hostdata->pool, evt_struct); |
1870 | return -1; | |
1871 | } | |
1872 | ||
1873 | init_completion(&evt_struct->comp); | |
06f923cb | 1874 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
e1a5ce5b | 1875 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2); |
06f923cb | 1876 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
e5dbfa66 | 1877 | if (rc == 0) |
1da177e4 | 1878 | wait_for_completion(&evt_struct->comp); |
e5dbfa66 | 1879 | dma_unmap_single(hostdata->dev, addr, length, DMA_BIDIRECTIONAL); |
1da177e4 LT |
1880 | |
1881 | return rc; | |
1882 | } | |
1883 | ||
0979c84b RJ |
1884 | /** |
1885 | * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk. | |
1886 | * @sdev: struct scsi_device device to configure | |
1887 | * | |
1888 | * Enable allow_restart for a device if it is a disk. Adjust the | |
1889 | * queue_depth here also as is required by the documentation for | |
1890 | * struct scsi_host_template. | |
1891 | */ | |
1892 | static int ibmvscsi_slave_configure(struct scsi_device *sdev) | |
1893 | { | |
1894 | struct Scsi_Host *shost = sdev->host; | |
1895 | unsigned long lock_flags = 0; | |
1896 | ||
1897 | spin_lock_irqsave(shost->host_lock, lock_flags); | |
d1a357fc | 1898 | if (sdev->type == TYPE_DISK) { |
0979c84b | 1899 | sdev->allow_restart = 1; |
e1a5ce5b | 1900 | blk_queue_rq_timeout(sdev->request_queue, 120 * HZ); |
d1a357fc | 1901 | } |
0979c84b RJ |
1902 | scsi_adjust_queue_depth(sdev, 0, shost->cmd_per_lun); |
1903 | spin_unlock_irqrestore(shost->host_lock, lock_flags); | |
1904 | return 0; | |
1905 | } | |
1906 | ||
742d25b8 BK |
1907 | /** |
1908 | * ibmvscsi_change_queue_depth - Change the device's queue depth | |
1909 | * @sdev: scsi device struct | |
1910 | * @qdepth: depth to set | |
e881a172 | 1911 | * @reason: calling context |
742d25b8 BK |
1912 | * |
1913 | * Return value: | |
1914 | * actual depth set | |
1915 | **/ | |
e881a172 MC |
1916 | static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth, |
1917 | int reason) | |
742d25b8 | 1918 | { |
e881a172 MC |
1919 | if (reason != SCSI_QDEPTH_DEFAULT) |
1920 | return -EOPNOTSUPP; | |
1921 | ||
742d25b8 BK |
1922 | if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN) |
1923 | qdepth = IBMVSCSI_MAX_CMDS_PER_LUN; | |
1924 | ||
1925 | scsi_adjust_queue_depth(sdev, 0, qdepth); | |
1926 | return sdev->queue_depth; | |
1927 | } | |
1928 | ||
1da177e4 LT |
1929 | /* ------------------------------------------------------------ |
1930 | * sysfs attributes | |
1931 | */ | |
126c5cc3 BK |
1932 | static ssize_t show_host_vhost_loc(struct device *dev, |
1933 | struct device_attribute *attr, char *buf) | |
1934 | { | |
1935 | struct Scsi_Host *shost = class_to_shost(dev); | |
1936 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); | |
1937 | int len; | |
1938 | ||
1939 | len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n", | |
1940 | hostdata->caps.loc); | |
1941 | return len; | |
1942 | } | |
1943 | ||
1944 | static struct device_attribute ibmvscsi_host_vhost_loc = { | |
1945 | .attr = { | |
1946 | .name = "vhost_loc", | |
1947 | .mode = S_IRUGO, | |
1948 | }, | |
1949 | .show = show_host_vhost_loc, | |
1950 | }; | |
1951 | ||
1952 | static ssize_t show_host_vhost_name(struct device *dev, | |
1953 | struct device_attribute *attr, char *buf) | |
1954 | { | |
1955 | struct Scsi_Host *shost = class_to_shost(dev); | |
1956 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); | |
1957 | int len; | |
1958 | ||
1959 | len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n", | |
1960 | hostdata->caps.name); | |
1961 | return len; | |
1962 | } | |
1963 | ||
1964 | static struct device_attribute ibmvscsi_host_vhost_name = { | |
1965 | .attr = { | |
1966 | .name = "vhost_name", | |
1967 | .mode = S_IRUGO, | |
1968 | }, | |
1969 | .show = show_host_vhost_name, | |
1970 | }; | |
1971 | ||
ee959b00 TJ |
1972 | static ssize_t show_host_srp_version(struct device *dev, |
1973 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1974 | { |
ee959b00 | 1975 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1976 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1977 | int len; |
1978 | ||
1979 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1980 | hostdata->madapter_info.srp_version); | |
1981 | return len; | |
1982 | } | |
1983 | ||
ee959b00 | 1984 | static struct device_attribute ibmvscsi_host_srp_version = { |
1da177e4 LT |
1985 | .attr = { |
1986 | .name = "srp_version", | |
1987 | .mode = S_IRUGO, | |
1988 | }, | |
1989 | .show = show_host_srp_version, | |
1990 | }; | |
1991 | ||
ee959b00 TJ |
1992 | static ssize_t show_host_partition_name(struct device *dev, |
1993 | struct device_attribute *attr, | |
1da177e4 LT |
1994 | char *buf) |
1995 | { | |
ee959b00 | 1996 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1997 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1998 | int len; |
1999 | ||
2000 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
2001 | hostdata->madapter_info.partition_name); | |
2002 | return len; | |
2003 | } | |
2004 | ||
ee959b00 | 2005 | static struct device_attribute ibmvscsi_host_partition_name = { |
1da177e4 LT |
2006 | .attr = { |
2007 | .name = "partition_name", | |
2008 | .mode = S_IRUGO, | |
2009 | }, | |
2010 | .show = show_host_partition_name, | |
2011 | }; | |
2012 | ||
ee959b00 TJ |
2013 | static ssize_t show_host_partition_number(struct device *dev, |
2014 | struct device_attribute *attr, | |
1da177e4 LT |
2015 | char *buf) |
2016 | { | |
ee959b00 | 2017 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 2018 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
2019 | int len; |
2020 | ||
2021 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
2022 | hostdata->madapter_info.partition_number); | |
2023 | return len; | |
2024 | } | |
2025 | ||
ee959b00 | 2026 | static struct device_attribute ibmvscsi_host_partition_number = { |
1da177e4 LT |
2027 | .attr = { |
2028 | .name = "partition_number", | |
2029 | .mode = S_IRUGO, | |
2030 | }, | |
2031 | .show = show_host_partition_number, | |
2032 | }; | |
2033 | ||
ee959b00 TJ |
2034 | static ssize_t show_host_mad_version(struct device *dev, |
2035 | struct device_attribute *attr, char *buf) | |
1da177e4 | 2036 | { |
ee959b00 | 2037 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 2038 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
2039 | int len; |
2040 | ||
2041 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
2042 | hostdata->madapter_info.mad_version); | |
2043 | return len; | |
2044 | } | |
2045 | ||
ee959b00 | 2046 | static struct device_attribute ibmvscsi_host_mad_version = { |
1da177e4 LT |
2047 | .attr = { |
2048 | .name = "mad_version", | |
2049 | .mode = S_IRUGO, | |
2050 | }, | |
2051 | .show = show_host_mad_version, | |
2052 | }; | |
2053 | ||
ee959b00 TJ |
2054 | static ssize_t show_host_os_type(struct device *dev, |
2055 | struct device_attribute *attr, char *buf) | |
1da177e4 | 2056 | { |
ee959b00 | 2057 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 2058 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
2059 | int len; |
2060 | ||
2061 | len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type); | |
2062 | return len; | |
2063 | } | |
2064 | ||
ee959b00 | 2065 | static struct device_attribute ibmvscsi_host_os_type = { |
1da177e4 LT |
2066 | .attr = { |
2067 | .name = "os_type", | |
2068 | .mode = S_IRUGO, | |
2069 | }, | |
2070 | .show = show_host_os_type, | |
2071 | }; | |
2072 | ||
ee959b00 TJ |
2073 | static ssize_t show_host_config(struct device *dev, |
2074 | struct device_attribute *attr, char *buf) | |
1da177e4 | 2075 | { |
ee959b00 | 2076 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 2077 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
2078 | |
2079 | /* returns null-terminated host config data */ | |
2080 | if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0) | |
2081 | return strlen(buf); | |
2082 | else | |
2083 | return 0; | |
2084 | } | |
2085 | ||
ee959b00 | 2086 | static struct device_attribute ibmvscsi_host_config = { |
1da177e4 LT |
2087 | .attr = { |
2088 | .name = "config", | |
2089 | .mode = S_IRUGO, | |
2090 | }, | |
2091 | .show = show_host_config, | |
2092 | }; | |
2093 | ||
ee959b00 | 2094 | static struct device_attribute *ibmvscsi_attrs[] = { |
126c5cc3 BK |
2095 | &ibmvscsi_host_vhost_loc, |
2096 | &ibmvscsi_host_vhost_name, | |
1da177e4 LT |
2097 | &ibmvscsi_host_srp_version, |
2098 | &ibmvscsi_host_partition_name, | |
2099 | &ibmvscsi_host_partition_number, | |
2100 | &ibmvscsi_host_mad_version, | |
2101 | &ibmvscsi_host_os_type, | |
2102 | &ibmvscsi_host_config, | |
2103 | NULL | |
2104 | }; | |
2105 | ||
2106 | /* ------------------------------------------------------------ | |
2107 | * SCSI driver registration | |
2108 | */ | |
2109 | static struct scsi_host_template driver_template = { | |
2110 | .module = THIS_MODULE, | |
2111 | .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION, | |
2112 | .proc_name = "ibmvscsi", | |
2113 | .queuecommand = ibmvscsi_queuecommand, | |
2114 | .eh_abort_handler = ibmvscsi_eh_abort_handler, | |
2115 | .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler, | |
3d0e91f7 | 2116 | .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler, |
0979c84b | 2117 | .slave_configure = ibmvscsi_slave_configure, |
742d25b8 | 2118 | .change_queue_depth = ibmvscsi_change_queue_depth, |
7912a0ac | 2119 | .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT, |
a897ff2a | 2120 | .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT, |
1da177e4 | 2121 | .this_id = -1, |
4dddbc26 | 2122 | .sg_tablesize = SG_ALL, |
1da177e4 LT |
2123 | .use_clustering = ENABLE_CLUSTERING, |
2124 | .shost_attrs = ibmvscsi_attrs, | |
2125 | }; | |
2126 | ||
7912a0ac RJ |
2127 | /** |
2128 | * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver | |
2129 | * | |
2130 | * @vdev: struct vio_dev for the device whose desired IO mem is to be returned | |
2131 | * | |
2132 | * Return value: | |
2133 | * Number of bytes of IO data the driver will need to perform well. | |
2134 | */ | |
2135 | static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev) | |
2136 | { | |
2137 | /* iu_storage data allocated in initialize_event_pool */ | |
4f10aae0 | 2138 | unsigned long desired_io = max_events * sizeof(union viosrp_iu); |
7912a0ac RJ |
2139 | |
2140 | /* add io space for sg data */ | |
004dd5e8 | 2141 | desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 * |
7912a0ac RJ |
2142 | IBMVSCSI_CMDS_PER_LUN_DEFAULT); |
2143 | ||
2144 | return desired_io; | |
2145 | } | |
2146 | ||
0f33ece5 BK |
2147 | static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata) |
2148 | { | |
2149 | int rc; | |
2150 | char *action = "reset"; | |
2151 | ||
2152 | if (hostdata->reset_crq) { | |
2153 | smp_rmb(); | |
2154 | hostdata->reset_crq = 0; | |
2155 | ||
9965c2f1 | 2156 | rc = ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata); |
0f33ece5 | 2157 | if (!rc) |
9965c2f1 | 2158 | rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0); |
201aed67 | 2159 | vio_enable_interrupts(to_vio_dev(hostdata->dev)); |
0f33ece5 BK |
2160 | } else if (hostdata->reenable_crq) { |
2161 | smp_rmb(); | |
2162 | action = "enable"; | |
9965c2f1 | 2163 | rc = ibmvscsi_reenable_crq_queue(&hostdata->queue, hostdata); |
0f33ece5 BK |
2164 | hostdata->reenable_crq = 0; |
2165 | if (!rc) | |
9965c2f1 | 2166 | rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0); |
0f33ece5 BK |
2167 | } else |
2168 | return; | |
2169 | ||
2170 | if (rc) { | |
2171 | atomic_set(&hostdata->request_limit, -1); | |
2172 | dev_err(hostdata->dev, "error after %s\n", action); | |
2173 | } | |
2174 | ||
2175 | scsi_unblock_requests(hostdata->host); | |
2176 | } | |
2177 | ||
2178 | static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata) | |
2179 | { | |
2180 | if (kthread_should_stop()) | |
2181 | return 1; | |
2182 | else if (hostdata->reset_crq) { | |
2183 | smp_rmb(); | |
2184 | return 1; | |
2185 | } else if (hostdata->reenable_crq) { | |
2186 | smp_rmb(); | |
2187 | return 1; | |
2188 | } | |
2189 | ||
2190 | return 0; | |
2191 | } | |
2192 | ||
2193 | static int ibmvscsi_work(void *data) | |
2194 | { | |
2195 | struct ibmvscsi_host_data *hostdata = data; | |
2196 | int rc; | |
2197 | ||
2198 | set_user_nice(current, -20); | |
2199 | ||
2200 | while (1) { | |
2201 | rc = wait_event_interruptible(hostdata->work_wait_q, | |
2202 | ibmvscsi_work_to_do(hostdata)); | |
2203 | ||
2204 | BUG_ON(rc); | |
2205 | ||
2206 | if (kthread_should_stop()) | |
2207 | break; | |
2208 | ||
2209 | ibmvscsi_do_work(hostdata); | |
2210 | } | |
2211 | ||
2212 | return 0; | |
2213 | } | |
2214 | ||
1da177e4 LT |
2215 | /** |
2216 | * Called by bus code for each adapter | |
2217 | */ | |
2218 | static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id) | |
2219 | { | |
2220 | struct ibmvscsi_host_data *hostdata; | |
2221 | struct Scsi_Host *host; | |
2222 | struct device *dev = &vdev->dev; | |
4d680419 FT |
2223 | struct srp_rport_identifiers ids; |
2224 | struct srp_rport *rport; | |
1da177e4 | 2225 | unsigned long wait_switch = 0; |
cefbda2d | 2226 | int rc; |
1da177e4 | 2227 | |
559fde70 | 2228 | dev_set_drvdata(&vdev->dev, NULL); |
1da177e4 LT |
2229 | |
2230 | host = scsi_host_alloc(&driver_template, sizeof(*hostdata)); | |
2231 | if (!host) { | |
6c0a60ec | 2232 | dev_err(&vdev->dev, "couldn't allocate host data\n"); |
1da177e4 LT |
2233 | goto scsi_host_alloc_failed; |
2234 | } | |
2235 | ||
4d680419 | 2236 | host->transportt = ibmvscsi_transport_template; |
7603e02e | 2237 | hostdata = shost_priv(host); |
1da177e4 LT |
2238 | memset(hostdata, 0x00, sizeof(*hostdata)); |
2239 | INIT_LIST_HEAD(&hostdata->sent); | |
0f33ece5 | 2240 | init_waitqueue_head(&hostdata->work_wait_q); |
1da177e4 LT |
2241 | hostdata->host = host; |
2242 | hostdata->dev = dev; | |
2243 | atomic_set(&hostdata->request_limit, -1); | |
7912a0ac | 2244 | hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT; |
1da177e4 | 2245 | |
126c5cc3 BK |
2246 | if (map_persist_bufs(hostdata)) { |
2247 | dev_err(&vdev->dev, "couldn't map persistent buffers\n"); | |
2248 | goto persist_bufs_failed; | |
2249 | } | |
2250 | ||
0f33ece5 BK |
2251 | hostdata->work_thread = kthread_run(ibmvscsi_work, hostdata, "%s_%d", |
2252 | "ibmvscsi", host->host_no); | |
2253 | ||
2254 | if (IS_ERR(hostdata->work_thread)) { | |
2255 | dev_err(&vdev->dev, "couldn't initialize kthread. rc=%ld\n", | |
2256 | PTR_ERR(hostdata->work_thread)); | |
2257 | goto init_crq_failed; | |
2258 | } | |
2259 | ||
9965c2f1 | 2260 | rc = ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, max_events); |
cefbda2d | 2261 | if (rc != 0 && rc != H_RESOURCE) { |
6c0a60ec | 2262 | dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc); |
0f33ece5 | 2263 | goto kill_kthread; |
1da177e4 | 2264 | } |
4f10aae0 | 2265 | if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) { |
6c0a60ec | 2266 | dev_err(&vdev->dev, "couldn't initialize event pool\n"); |
1da177e4 LT |
2267 | goto init_pool_failed; |
2268 | } | |
2269 | ||
2270 | host->max_lun = 8; | |
2271 | host->max_id = max_id; | |
2272 | host->max_channel = max_channel; | |
fbc56f08 | 2273 | host->max_cmd_len = 16; |
1da177e4 LT |
2274 | |
2275 | if (scsi_add_host(hostdata->host, hostdata->dev)) | |
2276 | goto add_host_failed; | |
2277 | ||
4d680419 FT |
2278 | /* we don't have a proper target_port_id so let's use the fake one */ |
2279 | memcpy(ids.port_id, hostdata->madapter_info.partition_name, | |
2280 | sizeof(ids.port_id)); | |
aebd5e47 | 2281 | ids.roles = SRP_RPORT_ROLE_TARGET; |
4d680419 FT |
2282 | rport = srp_rport_add(host, &ids); |
2283 | if (IS_ERR(rport)) | |
2284 | goto add_srp_port_failed; | |
2285 | ||
1da177e4 LT |
2286 | /* Try to send an initialization message. Note that this is allowed |
2287 | * to fail if the other end is not acive. In that case we don't | |
2288 | * want to scan | |
2289 | */ | |
9965c2f1 | 2290 | if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0 |
cefbda2d | 2291 | || rc == H_RESOURCE) { |
1da177e4 LT |
2292 | /* |
2293 | * Wait around max init_timeout secs for the adapter to finish | |
2294 | * initializing. When we are done initializing, we will have a | |
2295 | * valid request_limit. We don't want Linux scanning before | |
2296 | * we are ready. | |
2297 | */ | |
2298 | for (wait_switch = jiffies + (init_timeout * HZ); | |
2299 | time_before(jiffies, wait_switch) && | |
2300 | atomic_read(&hostdata->request_limit) < 2;) { | |
2301 | ||
2302 | msleep(10); | |
2303 | } | |
2304 | ||
2305 | /* if we now have a valid request_limit, initiate a scan */ | |
2306 | if (atomic_read(&hostdata->request_limit) > 0) | |
2307 | scsi_scan_host(host); | |
2308 | } | |
2309 | ||
559fde70 | 2310 | dev_set_drvdata(&vdev->dev, hostdata); |
1da177e4 LT |
2311 | return 0; |
2312 | ||
4d680419 FT |
2313 | add_srp_port_failed: |
2314 | scsi_remove_host(hostdata->host); | |
1da177e4 LT |
2315 | add_host_failed: |
2316 | release_event_pool(&hostdata->pool, hostdata); | |
2317 | init_pool_failed: | |
9965c2f1 | 2318 | ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_events); |
0f33ece5 BK |
2319 | kill_kthread: |
2320 | kthread_stop(hostdata->work_thread); | |
1da177e4 | 2321 | init_crq_failed: |
126c5cc3 BK |
2322 | unmap_persist_bufs(hostdata); |
2323 | persist_bufs_failed: | |
1da177e4 LT |
2324 | scsi_host_put(host); |
2325 | scsi_host_alloc_failed: | |
2326 | return -1; | |
2327 | } | |
2328 | ||
2329 | static int ibmvscsi_remove(struct vio_dev *vdev) | |
2330 | { | |
559fde70 | 2331 | struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev); |
126c5cc3 | 2332 | unmap_persist_bufs(hostdata); |
1da177e4 | 2333 | release_event_pool(&hostdata->pool, hostdata); |
9965c2f1 | 2334 | ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, |
4f10aae0 | 2335 | max_events); |
4d680419 | 2336 | |
0f33ece5 | 2337 | kthread_stop(hostdata->work_thread); |
4d680419 | 2338 | srp_remove_host(hostdata->host); |
1da177e4 LT |
2339 | scsi_remove_host(hostdata->host); |
2340 | scsi_host_put(hostdata->host); | |
2341 | ||
2342 | return 0; | |
2343 | } | |
2344 | ||
64355b92 BK |
2345 | /** |
2346 | * ibmvscsi_resume: Resume from suspend | |
2347 | * @dev: device struct | |
2348 | * | |
2349 | * We may have lost an interrupt across suspend/resume, so kick the | |
2350 | * interrupt handler | |
2351 | */ | |
2352 | static int ibmvscsi_resume(struct device *dev) | |
2353 | { | |
2354 | struct ibmvscsi_host_data *hostdata = dev_get_drvdata(dev); | |
9965c2f1 BH |
2355 | vio_disable_interrupts(to_vio_dev(hostdata->dev)); |
2356 | tasklet_schedule(&hostdata->srp_task); | |
2357 | ||
2358 | return 0; | |
64355b92 BK |
2359 | } |
2360 | ||
1da177e4 LT |
2361 | /** |
2362 | * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we | |
2363 | * support. | |
2364 | */ | |
6f039790 | 2365 | static struct vio_device_id ibmvscsi_device_table[] = { |
1da177e4 | 2366 | {"vscsi", "IBM,v-scsi"}, |
fb120da6 | 2367 | { "", "" } |
1da177e4 | 2368 | }; |
1da177e4 | 2369 | MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table); |
915124d8 | 2370 | |
64355b92 BK |
2371 | static struct dev_pm_ops ibmvscsi_pm_ops = { |
2372 | .resume = ibmvscsi_resume | |
2373 | }; | |
2374 | ||
1da177e4 | 2375 | static struct vio_driver ibmvscsi_driver = { |
1da177e4 LT |
2376 | .id_table = ibmvscsi_device_table, |
2377 | .probe = ibmvscsi_probe, | |
6fdf5392 | 2378 | .remove = ibmvscsi_remove, |
7912a0ac | 2379 | .get_desired_dma = ibmvscsi_get_desired_dma, |
cb52d897 BH |
2380 | .name = "ibmvscsi", |
2381 | .pm = &ibmvscsi_pm_ops, | |
1da177e4 LT |
2382 | }; |
2383 | ||
4d680419 FT |
2384 | static struct srp_function_template ibmvscsi_transport_functions = { |
2385 | }; | |
2386 | ||
1da177e4 LT |
2387 | int __init ibmvscsi_module_init(void) |
2388 | { | |
4d680419 FT |
2389 | int ret; |
2390 | ||
4f10aae0 BK |
2391 | /* Ensure we have two requests to do error recovery */ |
2392 | driver_template.can_queue = max_requests; | |
2393 | max_events = max_requests + 2; | |
2394 | ||
9965c2f1 | 2395 | if (!firmware_has_feature(FW_FEATURE_VIO)) |
d3849d51 DW |
2396 | return -ENODEV; |
2397 | ||
4d680419 FT |
2398 | ibmvscsi_transport_template = |
2399 | srp_attach_transport(&ibmvscsi_transport_functions); | |
2400 | if (!ibmvscsi_transport_template) | |
2401 | return -ENOMEM; | |
2402 | ||
2403 | ret = vio_register_driver(&ibmvscsi_driver); | |
2404 | if (ret) | |
2405 | srp_release_transport(ibmvscsi_transport_template); | |
2406 | return ret; | |
1da177e4 LT |
2407 | } |
2408 | ||
2409 | void __exit ibmvscsi_module_exit(void) | |
2410 | { | |
2411 | vio_unregister_driver(&ibmvscsi_driver); | |
4d680419 | 2412 | srp_release_transport(ibmvscsi_transport_template); |
1da177e4 LT |
2413 | } |
2414 | ||
2415 | module_init(ibmvscsi_module_init); | |
2416 | module_exit(ibmvscsi_module_exit); |