]>
Commit | Line | Data |
---|---|---|
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); | |
e3678a0c | 109 | MODULE_PARM_DESC(max_id, "Largest ID value for each channel [Default=64]"); |
1da177e4 | 110 | module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR); |
e3678a0c | 111 | MODULE_PARM_DESC(max_channel, "Largest channel value [Default=3]"); |
1da177e4 LT |
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]; | |
55c9b1e5 | 185 | if (crq->valid != VIOSRP_CRQ_FREE) { |
9965c2f1 BH |
186 | if (++queue->cur == queue->size) |
187 | queue->cur = 0; | |
7114aae0 BK |
188 | |
189 | /* Ensure the read of the valid bit occurs before reading any | |
190 | * other bits of the CRQ entry | |
191 | */ | |
192 | rmb(); | |
9965c2f1 BH |
193 | } else |
194 | crq = NULL; | |
195 | spin_unlock_irqrestore(&queue->lock, flags); | |
196 | ||
197 | return crq; | |
198 | } | |
199 | ||
200 | /** | |
201 | * ibmvscsi_send_crq: - Send a CRQ | |
202 | * @hostdata: the adapter | |
203 | * @word1: the first 64 bits of the data | |
204 | * @word2: the second 64 bits of the data | |
205 | */ | |
206 | static int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata, | |
207 | u64 word1, u64 word2) | |
208 | { | |
209 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
210 | ||
7114aae0 BK |
211 | /* |
212 | * Ensure the command buffer is flushed to memory before handing it | |
213 | * over to the VIOS to prevent it from fetching any stale data. | |
214 | */ | |
215 | mb(); | |
9965c2f1 BH |
216 | return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2); |
217 | } | |
218 | ||
219 | /** | |
220 | * ibmvscsi_task: - Process srps asynchronously | |
221 | * @data: ibmvscsi_host_data of host | |
222 | */ | |
223 | static void ibmvscsi_task(void *data) | |
224 | { | |
225 | struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data; | |
226 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
227 | struct viosrp_crq *crq; | |
228 | int done = 0; | |
229 | ||
230 | while (!done) { | |
231 | /* Pull all the valid messages off the CRQ */ | |
232 | while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) { | |
233 | ibmvscsi_handle_crq(crq, hostdata); | |
55c9b1e5 | 234 | crq->valid = VIOSRP_CRQ_FREE; |
9965c2f1 BH |
235 | } |
236 | ||
237 | vio_enable_interrupts(vdev); | |
238 | crq = crq_queue_next_crq(&hostdata->queue); | |
239 | if (crq != NULL) { | |
240 | vio_disable_interrupts(vdev); | |
241 | ibmvscsi_handle_crq(crq, hostdata); | |
55c9b1e5 | 242 | crq->valid = VIOSRP_CRQ_FREE; |
9965c2f1 BH |
243 | } else { |
244 | done = 1; | |
245 | } | |
246 | } | |
247 | } | |
248 | ||
249 | static void gather_partition_info(void) | |
250 | { | |
9965c2f1 | 251 | const char *ppartition_name; |
72264eb6 | 252 | const __be32 *p_number_ptr; |
9965c2f1 BH |
253 | |
254 | /* Retrieve information about this partition */ | |
5114d6a7 | 255 | if (!of_root) |
9965c2f1 | 256 | return; |
9965c2f1 | 257 | |
5114d6a7 TD |
258 | of_node_get(of_root); |
259 | ||
260 | ppartition_name = of_get_property(of_root, "ibm,partition-name", NULL); | |
9965c2f1 BH |
261 | if (ppartition_name) |
262 | strncpy(partition_name, ppartition_name, | |
263 | sizeof(partition_name)); | |
5114d6a7 | 264 | p_number_ptr = of_get_property(of_root, "ibm,partition-no", NULL); |
9965c2f1 | 265 | if (p_number_ptr) |
72264eb6 | 266 | partition_number = of_read_number(p_number_ptr, 1); |
5114d6a7 | 267 | of_node_put(of_root); |
9965c2f1 BH |
268 | } |
269 | ||
270 | static void set_adapter_info(struct ibmvscsi_host_data *hostdata) | |
271 | { | |
272 | memset(&hostdata->madapter_info, 0x00, | |
273 | sizeof(hostdata->madapter_info)); | |
274 | ||
275 | dev_info(hostdata->dev, "SRP_VERSION: %s\n", SRP_VERSION); | |
276 | strcpy(hostdata->madapter_info.srp_version, SRP_VERSION); | |
277 | ||
278 | strncpy(hostdata->madapter_info.partition_name, partition_name, | |
279 | sizeof(hostdata->madapter_info.partition_name)); | |
280 | ||
72264eb6 AB |
281 | hostdata->madapter_info.partition_number = |
282 | cpu_to_be32(partition_number); | |
9965c2f1 | 283 | |
45d8c30f TD |
284 | hostdata->madapter_info.mad_version = cpu_to_be32(SRP_MAD_VERSION_1); |
285 | hostdata->madapter_info.os_type = cpu_to_be32(SRP_MAD_OS_LINUX); | |
9965c2f1 BH |
286 | } |
287 | ||
288 | /** | |
289 | * reset_crq_queue: - resets a crq after a failure | |
290 | * @queue: crq_queue to initialize and register | |
291 | * @hostdata: ibmvscsi_host_data of host | |
292 | * | |
293 | */ | |
294 | static int ibmvscsi_reset_crq_queue(struct crq_queue *queue, | |
295 | struct ibmvscsi_host_data *hostdata) | |
296 | { | |
297 | int rc = 0; | |
298 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
299 | ||
300 | /* Close the CRQ */ | |
301 | do { | |
302 | if (rc) | |
303 | msleep(100); | |
304 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); | |
305 | } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); | |
306 | ||
307 | /* Clean out the queue */ | |
308 | memset(queue->msgs, 0x00, PAGE_SIZE); | |
309 | queue->cur = 0; | |
310 | ||
311 | set_adapter_info(hostdata); | |
312 | ||
313 | /* And re-open it again */ | |
314 | rc = plpar_hcall_norets(H_REG_CRQ, | |
315 | vdev->unit_address, | |
316 | queue->msg_token, PAGE_SIZE); | |
06cdbeff | 317 | if (rc == H_CLOSED) { |
9965c2f1 BH |
318 | /* Adapter is good, but other end is not ready */ |
319 | dev_warn(hostdata->dev, "Partner adapter not ready\n"); | |
320 | } else if (rc != 0) { | |
321 | dev_warn(hostdata->dev, "couldn't register crq--rc 0x%x\n", rc); | |
322 | } | |
323 | return rc; | |
324 | } | |
325 | ||
326 | /** | |
327 | * initialize_crq_queue: - Initializes and registers CRQ with hypervisor | |
328 | * @queue: crq_queue to initialize and register | |
329 | * @hostdata: ibmvscsi_host_data of host | |
330 | * | |
331 | * Allocates a page for messages, maps it for dma, and registers | |
332 | * the crq with the hypervisor. | |
333 | * Returns zero on success. | |
334 | */ | |
335 | static int ibmvscsi_init_crq_queue(struct crq_queue *queue, | |
336 | struct ibmvscsi_host_data *hostdata, | |
337 | int max_requests) | |
338 | { | |
339 | int rc; | |
340 | int retrc; | |
341 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
342 | ||
343 | queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL); | |
344 | ||
345 | if (!queue->msgs) | |
346 | goto malloc_failed; | |
347 | queue->size = PAGE_SIZE / sizeof(*queue->msgs); | |
348 | ||
349 | queue->msg_token = dma_map_single(hostdata->dev, queue->msgs, | |
350 | queue->size * sizeof(*queue->msgs), | |
351 | DMA_BIDIRECTIONAL); | |
352 | ||
353 | if (dma_mapping_error(hostdata->dev, queue->msg_token)) | |
354 | goto map_failed; | |
355 | ||
356 | gather_partition_info(); | |
357 | set_adapter_info(hostdata); | |
358 | ||
359 | retrc = rc = plpar_hcall_norets(H_REG_CRQ, | |
360 | vdev->unit_address, | |
361 | queue->msg_token, PAGE_SIZE); | |
362 | if (rc == H_RESOURCE) | |
363 | /* maybe kexecing and resource is busy. try a reset */ | |
364 | rc = ibmvscsi_reset_crq_queue(queue, | |
365 | hostdata); | |
366 | ||
06cdbeff | 367 | if (rc == H_CLOSED) { |
9965c2f1 BH |
368 | /* Adapter is good, but other end is not ready */ |
369 | dev_warn(hostdata->dev, "Partner adapter not ready\n"); | |
370 | retrc = 0; | |
371 | } else if (rc != 0) { | |
372 | dev_warn(hostdata->dev, "Error %d opening adapter\n", rc); | |
373 | goto reg_crq_failed; | |
374 | } | |
375 | ||
376 | queue->cur = 0; | |
377 | spin_lock_init(&queue->lock); | |
378 | ||
379 | tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task, | |
380 | (unsigned long)hostdata); | |
381 | ||
382 | if (request_irq(vdev->irq, | |
383 | ibmvscsi_handle_event, | |
384 | 0, "ibmvscsi", (void *)hostdata) != 0) { | |
385 | dev_err(hostdata->dev, "couldn't register irq 0x%x\n", | |
386 | vdev->irq); | |
387 | goto req_irq_failed; | |
388 | } | |
389 | ||
390 | rc = vio_enable_interrupts(vdev); | |
391 | if (rc != 0) { | |
392 | dev_err(hostdata->dev, "Error %d enabling interrupts!!!\n", rc); | |
393 | goto req_irq_failed; | |
394 | } | |
395 | ||
396 | return retrc; | |
397 | ||
398 | req_irq_failed: | |
399 | tasklet_kill(&hostdata->srp_task); | |
400 | rc = 0; | |
401 | do { | |
402 | if (rc) | |
403 | msleep(100); | |
404 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); | |
405 | } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); | |
406 | reg_crq_failed: | |
407 | dma_unmap_single(hostdata->dev, | |
408 | queue->msg_token, | |
409 | queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL); | |
410 | map_failed: | |
411 | free_page((unsigned long)queue->msgs); | |
412 | malloc_failed: | |
413 | return -1; | |
414 | } | |
415 | ||
416 | /** | |
417 | * reenable_crq_queue: - reenables a crq after | |
418 | * @queue: crq_queue to initialize and register | |
419 | * @hostdata: ibmvscsi_host_data of host | |
420 | * | |
421 | */ | |
422 | static int ibmvscsi_reenable_crq_queue(struct crq_queue *queue, | |
423 | struct ibmvscsi_host_data *hostdata) | |
424 | { | |
425 | int rc = 0; | |
426 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
427 | ||
428 | /* Re-enable the CRQ */ | |
429 | do { | |
430 | if (rc) | |
431 | msleep(100); | |
432 | rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address); | |
433 | } while ((rc == H_IN_PROGRESS) || (rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); | |
434 | ||
435 | if (rc) | |
436 | dev_err(hostdata->dev, "Error %d enabling adapter\n", rc); | |
437 | return rc; | |
438 | } | |
439 | ||
1da177e4 LT |
440 | /* ------------------------------------------------------------ |
441 | * Routines for the event pool and event structs | |
442 | */ | |
443 | /** | |
444 | * initialize_event_pool: - Allocates and initializes the event pool for a host | |
445 | * @pool: event_pool to be initialized | |
446 | * @size: Number of events in pool | |
447 | * @hostdata: ibmvscsi_host_data who owns the event pool | |
448 | * | |
449 | * Returns zero on success. | |
450 | */ | |
451 | static int initialize_event_pool(struct event_pool *pool, | |
452 | int size, struct ibmvscsi_host_data *hostdata) | |
453 | { | |
454 | int i; | |
455 | ||
456 | pool->size = size; | |
457 | pool->next = 0; | |
4c021dd1 | 458 | pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL); |
1da177e4 LT |
459 | if (!pool->events) |
460 | return -ENOMEM; | |
1da177e4 LT |
461 | |
462 | pool->iu_storage = | |
463 | dma_alloc_coherent(hostdata->dev, | |
464 | pool->size * sizeof(*pool->iu_storage), | |
465 | &pool->iu_token, 0); | |
466 | if (!pool->iu_storage) { | |
467 | kfree(pool->events); | |
468 | return -ENOMEM; | |
469 | } | |
470 | ||
471 | for (i = 0; i < pool->size; ++i) { | |
472 | struct srp_event_struct *evt = &pool->events[i]; | |
473 | memset(&evt->crq, 0x00, sizeof(evt->crq)); | |
474 | atomic_set(&evt->free, 1); | |
55c9b1e5 | 475 | evt->crq.valid = VIOSRP_CRQ_CMD_RSP; |
72264eb6 AB |
476 | evt->crq.IU_length = cpu_to_be16(sizeof(*evt->xfer_iu)); |
477 | evt->crq.IU_data_ptr = cpu_to_be64(pool->iu_token + | |
478 | sizeof(*evt->xfer_iu) * i); | |
1da177e4 LT |
479 | evt->xfer_iu = pool->iu_storage + i; |
480 | evt->hostdata = hostdata; | |
4dddbc26 JB |
481 | evt->ext_list = NULL; |
482 | evt->ext_list_token = 0; | |
1da177e4 LT |
483 | } |
484 | ||
485 | return 0; | |
486 | } | |
487 | ||
488 | /** | |
489 | * release_event_pool: - Frees memory of an event pool of a host | |
490 | * @pool: event_pool to be released | |
491 | * @hostdata: ibmvscsi_host_data who owns the even pool | |
492 | * | |
493 | * Returns zero on success. | |
494 | */ | |
495 | static void release_event_pool(struct event_pool *pool, | |
496 | struct ibmvscsi_host_data *hostdata) | |
497 | { | |
498 | int i, in_use = 0; | |
4dddbc26 | 499 | for (i = 0; i < pool->size; ++i) { |
1da177e4 LT |
500 | if (atomic_read(&pool->events[i].free) != 1) |
501 | ++in_use; | |
4dddbc26 JB |
502 | if (pool->events[i].ext_list) { |
503 | dma_free_coherent(hostdata->dev, | |
ef265673 | 504 | SG_ALL * sizeof(struct srp_direct_buf), |
4dddbc26 JB |
505 | pool->events[i].ext_list, |
506 | pool->events[i].ext_list_token); | |
507 | } | |
508 | } | |
1da177e4 | 509 | if (in_use) |
6c0a60ec BK |
510 | dev_warn(hostdata->dev, "releasing event pool with %d " |
511 | "events still in use?\n", in_use); | |
1da177e4 LT |
512 | kfree(pool->events); |
513 | dma_free_coherent(hostdata->dev, | |
514 | pool->size * sizeof(*pool->iu_storage), | |
515 | pool->iu_storage, pool->iu_token); | |
516 | } | |
517 | ||
518 | /** | |
519 | * valid_event_struct: - Determines if event is valid. | |
520 | * @pool: event_pool that contains the event | |
521 | * @evt: srp_event_struct to be checked for validity | |
522 | * | |
523 | * Returns zero if event is invalid, one otherwise. | |
524 | */ | |
525 | static int valid_event_struct(struct event_pool *pool, | |
526 | struct srp_event_struct *evt) | |
527 | { | |
528 | int index = evt - pool->events; | |
529 | if (index < 0 || index >= pool->size) /* outside of bounds */ | |
530 | return 0; | |
531 | if (evt != pool->events + index) /* unaligned */ | |
532 | return 0; | |
533 | return 1; | |
534 | } | |
535 | ||
536 | /** | |
537 | * ibmvscsi_free-event_struct: - Changes status of event to "free" | |
538 | * @pool: event_pool that contains the event | |
539 | * @evt: srp_event_struct to be modified | |
540 | * | |
541 | */ | |
542 | static void free_event_struct(struct event_pool *pool, | |
543 | struct srp_event_struct *evt) | |
544 | { | |
545 | if (!valid_event_struct(pool, evt)) { | |
6c0a60ec BK |
546 | dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p " |
547 | "(not in pool %p)\n", evt, pool->events); | |
1da177e4 LT |
548 | return; |
549 | } | |
550 | if (atomic_inc_return(&evt->free) != 1) { | |
6c0a60ec BK |
551 | dev_err(evt->hostdata->dev, "Freeing event_struct %p " |
552 | "which is not in use!\n", evt); | |
1da177e4 LT |
553 | return; |
554 | } | |
555 | } | |
556 | ||
557 | /** | |
558 | * get_evt_struct: - Gets the next free event in pool | |
559 | * @pool: event_pool that contains the events to be searched | |
560 | * | |
561 | * Returns the next event in "free" state, and NULL if none are free. | |
562 | * Note that no synchronization is done here, we assume the host_lock | |
563 | * will syncrhonze things. | |
564 | */ | |
565 | static struct srp_event_struct *get_event_struct(struct event_pool *pool) | |
566 | { | |
567 | int i; | |
568 | int poolsize = pool->size; | |
569 | int offset = pool->next; | |
570 | ||
571 | for (i = 0; i < poolsize; i++) { | |
572 | offset = (offset + 1) % poolsize; | |
573 | if (!atomic_dec_if_positive(&pool->events[offset].free)) { | |
574 | pool->next = offset; | |
575 | return &pool->events[offset]; | |
576 | } | |
577 | } | |
578 | ||
579 | printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n"); | |
580 | return NULL; | |
581 | } | |
582 | ||
583 | /** | |
584 | * init_event_struct: Initialize fields in an event struct that are always | |
585 | * required. | |
586 | * @evt: The event | |
587 | * @done: Routine to call when the event is responded to | |
588 | * @format: SRP or MAD format | |
589 | * @timeout: timeout value set in the CRQ | |
590 | */ | |
591 | static void init_event_struct(struct srp_event_struct *evt_struct, | |
592 | void (*done) (struct srp_event_struct *), | |
593 | u8 format, | |
594 | int timeout) | |
595 | { | |
596 | evt_struct->cmnd = NULL; | |
597 | evt_struct->cmnd_done = NULL; | |
598 | evt_struct->sync_srp = NULL; | |
599 | evt_struct->crq.format = format; | |
72264eb6 | 600 | evt_struct->crq.timeout = cpu_to_be16(timeout); |
1da177e4 LT |
601 | evt_struct->done = done; |
602 | } | |
603 | ||
604 | /* ------------------------------------------------------------ | |
605 | * Routines for receiving SCSI responses from the hosting partition | |
606 | */ | |
607 | ||
608 | /** | |
609 | * set_srp_direction: Set the fields in the srp related to data | |
610 | * direction and number of buffers based on the direction in | |
611 | * the scsi_cmnd and the number of buffers | |
612 | */ | |
613 | static void set_srp_direction(struct scsi_cmnd *cmd, | |
614 | struct srp_cmd *srp_cmd, | |
615 | int numbuf) | |
616 | { | |
ef265673 FT |
617 | u8 fmt; |
618 | ||
1da177e4 LT |
619 | if (numbuf == 0) |
620 | return; | |
621 | ||
ef265673 FT |
622 | if (numbuf == 1) |
623 | fmt = SRP_DATA_DESC_DIRECT; | |
624 | else { | |
625 | fmt = SRP_DATA_DESC_INDIRECT; | |
626 | numbuf = min(numbuf, MAX_INDIRECT_BUFS); | |
627 | ||
1da177e4 | 628 | if (cmd->sc_data_direction == DMA_TO_DEVICE) |
ef265673 FT |
629 | srp_cmd->data_out_desc_cnt = numbuf; |
630 | else | |
631 | srp_cmd->data_in_desc_cnt = numbuf; | |
1da177e4 | 632 | } |
ef265673 FT |
633 | |
634 | if (cmd->sc_data_direction == DMA_TO_DEVICE) | |
635 | srp_cmd->buf_fmt = fmt << 4; | |
636 | else | |
637 | srp_cmd->buf_fmt = fmt; | |
1da177e4 LT |
638 | } |
639 | ||
640 | /** | |
641 | * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format | |
642 | * @cmd: srp_cmd whose additional_data member will be unmapped | |
643 | * @dev: device for which the memory is mapped | |
644 | * | |
645 | */ | |
4dddbc26 JB |
646 | static void unmap_cmd_data(struct srp_cmd *cmd, |
647 | struct srp_event_struct *evt_struct, | |
648 | struct device *dev) | |
1da177e4 | 649 | { |
ef265673 FT |
650 | u8 out_fmt, in_fmt; |
651 | ||
652 | out_fmt = cmd->buf_fmt >> 4; | |
653 | in_fmt = cmd->buf_fmt & ((1U << 4) - 1); | |
654 | ||
655 | if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC) | |
1da177e4 | 656 | return; |
4dddbc26 | 657 | |
a71fa1fc FT |
658 | if (evt_struct->cmnd) |
659 | scsi_dma_unmap(evt_struct->cmnd); | |
1da177e4 LT |
660 | } |
661 | ||
9413d7b8 | 662 | static int map_sg_list(struct scsi_cmnd *cmd, int nseg, |
ef265673 | 663 | struct srp_direct_buf *md) |
4dddbc26 JB |
664 | { |
665 | int i; | |
9413d7b8 | 666 | struct scatterlist *sg; |
4dddbc26 JB |
667 | u64 total_length = 0; |
668 | ||
9413d7b8 | 669 | scsi_for_each_sg(cmd, sg, nseg, i) { |
ef265673 | 670 | struct srp_direct_buf *descr = md + i; |
72264eb6 AB |
671 | descr->va = cpu_to_be64(sg_dma_address(sg)); |
672 | descr->len = cpu_to_be32(sg_dma_len(sg)); | |
ef265673 | 673 | descr->key = 0; |
9413d7b8 | 674 | total_length += sg_dma_len(sg); |
4dddbc26 JB |
675 | } |
676 | return total_length; | |
677 | } | |
678 | ||
1da177e4 LT |
679 | /** |
680 | * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields | |
681 | * @cmd: Scsi_Cmnd with the scatterlist | |
682 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
683 | * @dev: device for which to map dma memory | |
684 | * | |
685 | * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd. | |
686 | * Returns 1 on success. | |
687 | */ | |
688 | static int map_sg_data(struct scsi_cmnd *cmd, | |
4dddbc26 | 689 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
690 | struct srp_cmd *srp_cmd, struct device *dev) |
691 | { | |
692 | ||
4dddbc26 | 693 | int sg_mapped; |
1da177e4 | 694 | u64 total_length = 0; |
ef265673 FT |
695 | struct srp_direct_buf *data = |
696 | (struct srp_direct_buf *) srp_cmd->add_data; | |
697 | struct srp_indirect_buf *indirect = | |
698 | (struct srp_indirect_buf *) data; | |
1da177e4 | 699 | |
9413d7b8 FT |
700 | sg_mapped = scsi_dma_map(cmd); |
701 | if (!sg_mapped) | |
702 | return 1; | |
703 | else if (sg_mapped < 0) | |
1da177e4 LT |
704 | return 0; |
705 | ||
706 | set_srp_direction(cmd, srp_cmd, sg_mapped); | |
707 | ||
708 | /* special case; we can use a single direct descriptor */ | |
709 | if (sg_mapped == 1) { | |
9413d7b8 | 710 | map_sg_list(cmd, sg_mapped, data); |
1da177e4 LT |
711 | return 1; |
712 | } | |
713 | ||
ef265673 | 714 | indirect->table_desc.va = 0; |
72264eb6 AB |
715 | indirect->table_desc.len = cpu_to_be32(sg_mapped * |
716 | sizeof(struct srp_direct_buf)); | |
ef265673 | 717 | indirect->table_desc.key = 0; |
4dddbc26 JB |
718 | |
719 | if (sg_mapped <= MAX_INDIRECT_BUFS) { | |
9413d7b8 | 720 | total_length = map_sg_list(cmd, sg_mapped, |
ef265673 | 721 | &indirect->desc_list[0]); |
72264eb6 | 722 | indirect->len = cpu_to_be32(total_length); |
4dddbc26 | 723 | return 1; |
1da177e4 | 724 | } |
1da177e4 | 725 | |
4dddbc26 JB |
726 | /* get indirect table */ |
727 | if (!evt_struct->ext_list) { | |
ef265673 | 728 | evt_struct->ext_list = (struct srp_direct_buf *) |
9413d7b8 | 729 | dma_alloc_coherent(dev, |
ef265673 FT |
730 | SG_ALL * sizeof(struct srp_direct_buf), |
731 | &evt_struct->ext_list_token, 0); | |
4dddbc26 | 732 | if (!evt_struct->ext_list) { |
7912a0ac RJ |
733 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
734 | sdev_printk(KERN_ERR, cmd->device, | |
735 | "Can't allocate memory " | |
736 | "for indirect table\n"); | |
e637d553 | 737 | scsi_dma_unmap(cmd); |
4dddbc26 | 738 | return 0; |
4dddbc26 JB |
739 | } |
740 | } | |
741 | ||
9413d7b8 | 742 | total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list); |
4dddbc26 | 743 | |
72264eb6 AB |
744 | indirect->len = cpu_to_be32(total_length); |
745 | indirect->table_desc.va = cpu_to_be64(evt_struct->ext_list_token); | |
746 | indirect->table_desc.len = cpu_to_be32(sg_mapped * | |
747 | sizeof(indirect->desc_list[0])); | |
ef265673 FT |
748 | memcpy(indirect->desc_list, evt_struct->ext_list, |
749 | MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf)); | |
4dddbc26 | 750 | return 1; |
1da177e4 LT |
751 | } |
752 | ||
1da177e4 LT |
753 | /** |
754 | * map_data_for_srp_cmd: - Calls functions to map data for srp cmds | |
755 | * @cmd: struct scsi_cmnd with the memory to be mapped | |
756 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
757 | * @dev: dma device for which to map dma memory | |
758 | * | |
759 | * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds | |
760 | * Returns 1 on success. | |
761 | */ | |
762 | static int map_data_for_srp_cmd(struct scsi_cmnd *cmd, | |
4dddbc26 | 763 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
764 | struct srp_cmd *srp_cmd, struct device *dev) |
765 | { | |
766 | switch (cmd->sc_data_direction) { | |
767 | case DMA_FROM_DEVICE: | |
768 | case DMA_TO_DEVICE: | |
769 | break; | |
770 | case DMA_NONE: | |
771 | return 1; | |
772 | case DMA_BIDIRECTIONAL: | |
6c0a60ec BK |
773 | sdev_printk(KERN_ERR, cmd->device, |
774 | "Can't map DMA_BIDIRECTIONAL to read/write\n"); | |
1da177e4 LT |
775 | return 0; |
776 | default: | |
6c0a60ec BK |
777 | sdev_printk(KERN_ERR, cmd->device, |
778 | "Unknown data direction 0x%02x; can't map!\n", | |
779 | cmd->sc_data_direction); | |
1da177e4 LT |
780 | return 0; |
781 | } | |
782 | ||
9413d7b8 | 783 | return map_sg_data(cmd, evt_struct, srp_cmd, dev); |
1da177e4 LT |
784 | } |
785 | ||
3d0e91f7 BK |
786 | /** |
787 | * purge_requests: Our virtual adapter just shut down. purge any sent requests | |
788 | * @hostdata: the adapter | |
789 | */ | |
790 | static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code) | |
791 | { | |
1117ef8a | 792 | struct srp_event_struct *evt; |
3d0e91f7 BK |
793 | unsigned long flags; |
794 | ||
795 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1117ef8a BK |
796 | while (!list_empty(&hostdata->sent)) { |
797 | evt = list_first_entry(&hostdata->sent, struct srp_event_struct, list); | |
798 | list_del(&evt->list); | |
799 | del_timer(&evt->timer); | |
800 | ||
801 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
802 | if (evt->cmnd) { | |
803 | evt->cmnd->result = (error_code << 16); | |
804 | unmap_cmd_data(&evt->iu.srp.cmd, evt, | |
805 | evt->hostdata->dev); | |
806 | if (evt->cmnd_done) | |
807 | evt->cmnd_done(evt->cmnd); | |
9ee75597 BK |
808 | } else if (evt->done && evt->crq.format != VIOSRP_MAD_FORMAT && |
809 | evt->iu.srp.login_req.opcode != SRP_LOGIN_REQ) | |
1117ef8a BK |
810 | evt->done(evt); |
811 | free_event_struct(&evt->hostdata->pool, evt); | |
812 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
3d0e91f7 BK |
813 | } |
814 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
815 | } | |
816 | ||
817 | /** | |
818 | * ibmvscsi_reset_host - Reset the connection to the server | |
819 | * @hostdata: struct ibmvscsi_host_data to reset | |
820 | */ | |
821 | static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata) | |
822 | { | |
823 | scsi_block_requests(hostdata->host); | |
824 | atomic_set(&hostdata->request_limit, 0); | |
825 | ||
826 | purge_requests(hostdata, DID_ERROR); | |
0f33ece5 BK |
827 | hostdata->reset_crq = 1; |
828 | wake_up(&hostdata->work_wait_q); | |
3d0e91f7 BK |
829 | } |
830 | ||
831 | /** | |
832 | * ibmvscsi_timeout - Internal command timeout handler | |
833 | * @evt_struct: struct srp_event_struct that timed out | |
834 | * | |
835 | * Called when an internally generated command times out | |
836 | */ | |
837 | static void ibmvscsi_timeout(struct srp_event_struct *evt_struct) | |
838 | { | |
839 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
840 | ||
841 | dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n", | |
842 | evt_struct->iu.srp.cmd.opcode); | |
843 | ||
844 | ibmvscsi_reset_host(hostdata); | |
845 | } | |
846 | ||
847 | ||
1da177e4 LT |
848 | /* ------------------------------------------------------------ |
849 | * Routines for sending and receiving SRPs | |
850 | */ | |
851 | /** | |
852 | * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq() | |
853 | * @evt_struct: evt_struct to be sent | |
854 | * @hostdata: ibmvscsi_host_data of host | |
3d0e91f7 | 855 | * @timeout: timeout in seconds - 0 means do not time command |
1da177e4 LT |
856 | * |
857 | * Returns the value returned from ibmvscsi_send_crq(). (Zero for success) | |
858 | * Note that this routine assumes that host_lock is held for synchronization | |
859 | */ | |
860 | static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct, | |
3d0e91f7 BK |
861 | struct ibmvscsi_host_data *hostdata, |
862 | unsigned long timeout) | |
1da177e4 | 863 | { |
72264eb6 | 864 | __be64 *crq_as_u64 = (__be64 *)&evt_struct->crq; |
3c887e8a | 865 | int request_status = 0; |
1da177e4 | 866 | int rc; |
f3a9c4d7 | 867 | int srp_req = 0; |
1da177e4 | 868 | |
a897ff2a RJ |
869 | /* If we have exhausted our request limit, just fail this request, |
870 | * unless it is for a reset or abort. | |
1da177e4 LT |
871 | * Note that there are rare cases involving driver generated requests |
872 | * (such as task management requests) that the mid layer may think we | |
873 | * can handle more requests (can_queue) when we actually can't | |
874 | */ | |
cefbda2d | 875 | if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) { |
f3a9c4d7 | 876 | srp_req = 1; |
cefbda2d DB |
877 | request_status = |
878 | atomic_dec_if_positive(&hostdata->request_limit); | |
879 | /* If request limit was -1 when we started, it is now even | |
880 | * less than that | |
881 | */ | |
882 | if (request_status < -1) | |
883 | goto send_error; | |
a897ff2a | 884 | /* Otherwise, we may have run out of requests. */ |
3c887e8a RJ |
885 | /* If request limit was 0 when we started the adapter is in the |
886 | * process of performing a login with the server adapter, or | |
887 | * we may have run out of requests. | |
888 | */ | |
889 | else if (request_status == -1 && | |
890 | evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ) | |
891 | goto send_busy; | |
a897ff2a RJ |
892 | /* Abort and reset calls should make it through. |
893 | * Nothing except abort and reset should use the last two | |
894 | * slots unless we had two or less to begin with. | |
895 | */ | |
896 | else if (request_status < 2 && | |
897 | evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) { | |
898 | /* In the case that we have less than two requests | |
899 | * available, check the server limit as a combination | |
900 | * of the request limit and the number of requests | |
901 | * in-flight (the size of the send list). If the | |
902 | * server limit is greater than 2, return busy so | |
903 | * that the last two are reserved for reset and abort. | |
904 | */ | |
905 | int server_limit = request_status; | |
906 | struct srp_event_struct *tmp_evt; | |
907 | ||
908 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
909 | server_limit++; | |
910 | } | |
911 | ||
912 | if (server_limit > 2) | |
913 | goto send_busy; | |
914 | } | |
cefbda2d | 915 | } |
1da177e4 LT |
916 | |
917 | /* Copy the IU into the transfer area */ | |
918 | *evt_struct->xfer_iu = evt_struct->iu; | |
ef265673 | 919 | evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct; |
1da177e4 LT |
920 | |
921 | /* Add this to the sent list. We need to do this | |
922 | * before we actually send | |
923 | * in case it comes back REALLY fast | |
924 | */ | |
925 | list_add_tail(&evt_struct->list, &hostdata->sent); | |
926 | ||
3d0e91f7 BK |
927 | init_timer(&evt_struct->timer); |
928 | if (timeout) { | |
929 | evt_struct->timer.data = (unsigned long) evt_struct; | |
930 | evt_struct->timer.expires = jiffies + (timeout * HZ); | |
931 | evt_struct->timer.function = (void (*)(unsigned long))ibmvscsi_timeout; | |
932 | add_timer(&evt_struct->timer); | |
933 | } | |
934 | ||
72264eb6 AB |
935 | rc = ibmvscsi_send_crq(hostdata, be64_to_cpu(crq_as_u64[0]), |
936 | be64_to_cpu(crq_as_u64[1])); | |
937 | if (rc != 0) { | |
1da177e4 | 938 | list_del(&evt_struct->list); |
3d0e91f7 | 939 | del_timer(&evt_struct->timer); |
1da177e4 | 940 | |
860784c8 RJ |
941 | /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY. |
942 | * Firmware will send a CRQ with a transport event (0xFF) to | |
943 | * tell this client what has happened to the transport. This | |
944 | * will be handled in ibmvscsi_handle_crq() | |
945 | */ | |
946 | if (rc == H_CLOSED) { | |
947 | dev_warn(hostdata->dev, "send warning. " | |
948 | "Receive queue closed, will retry.\n"); | |
949 | goto send_busy; | |
950 | } | |
6c0a60ec | 951 | dev_err(hostdata->dev, "send error %d\n", rc); |
f3a9c4d7 BK |
952 | if (srp_req) |
953 | atomic_inc(&hostdata->request_limit); | |
1da177e4 LT |
954 | goto send_error; |
955 | } | |
956 | ||
957 | return 0; | |
958 | ||
cefbda2d | 959 | send_busy: |
4dddbc26 | 960 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); |
1da177e4 | 961 | |
1da177e4 | 962 | free_event_struct(&hostdata->pool, evt_struct); |
f3a9c4d7 | 963 | if (srp_req && request_status != -1) |
3c887e8a | 964 | atomic_inc(&hostdata->request_limit); |
a897ff2a | 965 | return SCSI_MLQUEUE_HOST_BUSY; |
cefbda2d DB |
966 | |
967 | send_error: | |
968 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); | |
969 | ||
970 | if (evt_struct->cmnd != NULL) { | |
971 | evt_struct->cmnd->result = DID_ERROR << 16; | |
972 | evt_struct->cmnd_done(evt_struct->cmnd); | |
973 | } else if (evt_struct->done) | |
974 | evt_struct->done(evt_struct); | |
975 | ||
976 | free_event_struct(&hostdata->pool, evt_struct); | |
977 | return 0; | |
1da177e4 LT |
978 | } |
979 | ||
980 | /** | |
981 | * handle_cmd_rsp: - Handle responses from commands | |
982 | * @evt_struct: srp_event_struct to be handled | |
983 | * | |
984 | * Used as a callback by when sending scsi cmds. | |
985 | * Gets called by ibmvscsi_handle_crq() | |
986 | */ | |
987 | static void handle_cmd_rsp(struct srp_event_struct *evt_struct) | |
988 | { | |
989 | struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp; | |
990 | struct scsi_cmnd *cmnd = evt_struct->cmnd; | |
991 | ||
ef265673 | 992 | if (unlikely(rsp->opcode != SRP_RSP)) { |
1da177e4 | 993 | if (printk_ratelimit()) |
6c0a60ec BK |
994 | dev_warn(evt_struct->hostdata->dev, |
995 | "bad SRP RSP type %d\n", rsp->opcode); | |
1da177e4 LT |
996 | } |
997 | ||
998 | if (cmnd) { | |
c3a3b55a | 999 | cmnd->result |= rsp->status; |
1da177e4 LT |
1000 | if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION) |
1001 | memcpy(cmnd->sense_buffer, | |
ef265673 | 1002 | rsp->data, |
72264eb6 | 1003 | be32_to_cpu(rsp->sense_data_len)); |
1da177e4 | 1004 | unmap_cmd_data(&evt_struct->iu.srp.cmd, |
4dddbc26 | 1005 | evt_struct, |
1da177e4 LT |
1006 | evt_struct->hostdata->dev); |
1007 | ||
ef265673 | 1008 | if (rsp->flags & SRP_RSP_FLAG_DOOVER) |
72264eb6 AB |
1009 | scsi_set_resid(cmnd, |
1010 | be32_to_cpu(rsp->data_out_res_cnt)); | |
ef265673 | 1011 | else if (rsp->flags & SRP_RSP_FLAG_DIOVER) |
72264eb6 | 1012 | scsi_set_resid(cmnd, be32_to_cpu(rsp->data_in_res_cnt)); |
1da177e4 LT |
1013 | } |
1014 | ||
1015 | if (evt_struct->cmnd_done) | |
1016 | evt_struct->cmnd_done(cmnd); | |
1017 | } | |
1018 | ||
1019 | /** | |
1020 | * lun_from_dev: - Returns the lun of the scsi device | |
1021 | * @dev: struct scsi_device | |
1022 | * | |
1023 | */ | |
1024 | static inline u16 lun_from_dev(struct scsi_device *dev) | |
1025 | { | |
1026 | return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun; | |
1027 | } | |
1028 | ||
1029 | /** | |
1030 | * ibmvscsi_queue: - The queuecommand function of the scsi template | |
1031 | * @cmd: struct scsi_cmnd to be executed | |
1032 | * @done: Callback function to be called when cmd is completed | |
1033 | */ | |
f281233d | 1034 | static int ibmvscsi_queuecommand_lck(struct scsi_cmnd *cmnd, |
1da177e4 LT |
1035 | void (*done) (struct scsi_cmnd *)) |
1036 | { | |
1037 | struct srp_cmd *srp_cmd; | |
1038 | struct srp_event_struct *evt_struct; | |
ef265673 | 1039 | struct srp_indirect_buf *indirect; |
7603e02e | 1040 | struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host); |
1da177e4 | 1041 | u16 lun = lun_from_dev(cmnd->device); |
ef265673 | 1042 | u8 out_fmt, in_fmt; |
1da177e4 | 1043 | |
c3a3b55a | 1044 | cmnd->result = (DID_OK << 16); |
1da177e4 LT |
1045 | evt_struct = get_event_struct(&hostdata->pool); |
1046 | if (!evt_struct) | |
1047 | return SCSI_MLQUEUE_HOST_BUSY; | |
1048 | ||
1da177e4 LT |
1049 | /* Set up the actual SRP IU */ |
1050 | srp_cmd = &evt_struct->iu.srp.cmd; | |
ef265673 FT |
1051 | memset(srp_cmd, 0x00, SRP_MAX_IU_LEN); |
1052 | srp_cmd->opcode = SRP_CMD; | |
64a87b24 | 1053 | memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb)); |
985aa495 | 1054 | int_to_scsilun(lun, &srp_cmd->lun); |
1da177e4 | 1055 | |
4dddbc26 | 1056 | if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) { |
7912a0ac RJ |
1057 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
1058 | sdev_printk(KERN_ERR, cmnd->device, | |
1059 | "couldn't convert cmd to srp_cmd\n"); | |
1da177e4 LT |
1060 | free_event_struct(&hostdata->pool, evt_struct); |
1061 | return SCSI_MLQUEUE_HOST_BUSY; | |
1062 | } | |
1063 | ||
4dddbc26 JB |
1064 | init_event_struct(evt_struct, |
1065 | handle_cmd_rsp, | |
1066 | VIOSRP_SRP_FORMAT, | |
242f9dcb | 1067 | cmnd->request->timeout/HZ); |
4dddbc26 JB |
1068 | |
1069 | evt_struct->cmnd = cmnd; | |
1070 | evt_struct->cmnd_done = done; | |
1071 | ||
1da177e4 | 1072 | /* Fix up dma address of the buffer itself */ |
ef265673 FT |
1073 | indirect = (struct srp_indirect_buf *) srp_cmd->add_data; |
1074 | out_fmt = srp_cmd->buf_fmt >> 4; | |
1075 | in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1); | |
1076 | if ((in_fmt == SRP_DATA_DESC_INDIRECT || | |
1077 | out_fmt == SRP_DATA_DESC_INDIRECT) && | |
1078 | indirect->table_desc.va == 0) { | |
72264eb6 AB |
1079 | indirect->table_desc.va = |
1080 | cpu_to_be64(be64_to_cpu(evt_struct->crq.IU_data_ptr) + | |
ef265673 | 1081 | offsetof(struct srp_cmd, add_data) + |
72264eb6 | 1082 | offsetof(struct srp_indirect_buf, desc_list)); |
1da177e4 LT |
1083 | } |
1084 | ||
3d0e91f7 | 1085 | return ibmvscsi_send_srp_event(evt_struct, hostdata, 0); |
1da177e4 LT |
1086 | } |
1087 | ||
f281233d JG |
1088 | static DEF_SCSI_QCMD(ibmvscsi_queuecommand) |
1089 | ||
1da177e4 LT |
1090 | /* ------------------------------------------------------------ |
1091 | * Routines for driver initialization | |
1092 | */ | |
3507e13f | 1093 | |
126c5cc3 BK |
1094 | /** |
1095 | * map_persist_bufs: - Pre-map persistent data for adapter logins | |
1096 | * @hostdata: ibmvscsi_host_data of host | |
1097 | * | |
1098 | * Map the capabilities and adapter info DMA buffers to avoid runtime failures. | |
1099 | * Return 1 on error, 0 on success. | |
1100 | */ | |
1101 | static int map_persist_bufs(struct ibmvscsi_host_data *hostdata) | |
1102 | { | |
1103 | ||
1104 | hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps, | |
1105 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
1106 | ||
1107 | if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) { | |
1108 | dev_err(hostdata->dev, "Unable to map capabilities buffer!\n"); | |
1109 | return 1; | |
1110 | } | |
1111 | ||
1112 | hostdata->adapter_info_addr = dma_map_single(hostdata->dev, | |
1113 | &hostdata->madapter_info, | |
1114 | sizeof(hostdata->madapter_info), | |
1115 | DMA_BIDIRECTIONAL); | |
1116 | if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) { | |
1117 | dev_err(hostdata->dev, "Unable to map adapter info buffer!\n"); | |
1118 | dma_unmap_single(hostdata->dev, hostdata->caps_addr, | |
1119 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
1120 | return 1; | |
1121 | } | |
1122 | ||
1123 | return 0; | |
1124 | } | |
1125 | ||
1126 | /** | |
1127 | * unmap_persist_bufs: - Unmap persistent data needed for adapter logins | |
1128 | * @hostdata: ibmvscsi_host_data of host | |
1129 | * | |
1130 | * Unmap the capabilities and adapter info DMA buffers | |
1131 | */ | |
1132 | static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata) | |
1133 | { | |
1134 | dma_unmap_single(hostdata->dev, hostdata->caps_addr, | |
1135 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
1136 | ||
1137 | dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr, | |
1138 | sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL); | |
1139 | } | |
1140 | ||
3507e13f BK |
1141 | /** |
1142 | * login_rsp: - Handle response to SRP login request | |
1143 | * @evt_struct: srp_event_struct with the response | |
1144 | * | |
1145 | * Used as a "done" callback by when sending srp_login. Gets called | |
1146 | * by ibmvscsi_handle_crq() | |
1147 | */ | |
1148 | static void login_rsp(struct srp_event_struct *evt_struct) | |
1149 | { | |
1150 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
1151 | switch (evt_struct->xfer_iu->srp.login_rsp.opcode) { | |
1152 | case SRP_LOGIN_RSP: /* it worked! */ | |
1153 | break; | |
1154 | case SRP_LOGIN_REJ: /* refused! */ | |
1155 | dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n", | |
1156 | evt_struct->xfer_iu->srp.login_rej.reason); | |
1157 | /* Login failed. */ | |
1158 | atomic_set(&hostdata->request_limit, -1); | |
1159 | return; | |
1160 | default: | |
1161 | dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n", | |
1162 | evt_struct->xfer_iu->srp.login_rsp.opcode); | |
1163 | /* Login failed. */ | |
1164 | atomic_set(&hostdata->request_limit, -1); | |
1165 | return; | |
1166 | } | |
1167 | ||
1168 | dev_info(hostdata->dev, "SRP_LOGIN succeeded\n"); | |
126c5cc3 | 1169 | hostdata->client_migrated = 0; |
3507e13f BK |
1170 | |
1171 | /* Now we know what the real request-limit is. | |
1172 | * This value is set rather than added to request_limit because | |
1173 | * request_limit could have been set to -1 by this client. | |
1174 | */ | |
1175 | atomic_set(&hostdata->request_limit, | |
72264eb6 | 1176 | be32_to_cpu(evt_struct->xfer_iu->srp.login_rsp.req_lim_delta)); |
3507e13f BK |
1177 | |
1178 | /* If we had any pending I/Os, kick them */ | |
1179 | scsi_unblock_requests(hostdata->host); | |
1180 | } | |
1181 | ||
1182 | /** | |
1183 | * send_srp_login: - Sends the srp login | |
1184 | * @hostdata: ibmvscsi_host_data of host | |
1185 | * | |
1186 | * Returns zero if successful. | |
1187 | */ | |
1188 | static int send_srp_login(struct ibmvscsi_host_data *hostdata) | |
1189 | { | |
1190 | int rc; | |
1191 | unsigned long flags; | |
1192 | struct srp_login_req *login; | |
1193 | struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool); | |
1194 | ||
1195 | BUG_ON(!evt_struct); | |
1196 | init_event_struct(evt_struct, login_rsp, | |
1197 | VIOSRP_SRP_FORMAT, login_timeout); | |
1198 | ||
1199 | login = &evt_struct->iu.srp.login_req; | |
1200 | memset(login, 0, sizeof(*login)); | |
1201 | login->opcode = SRP_LOGIN_REQ; | |
72264eb6 AB |
1202 | login->req_it_iu_len = cpu_to_be32(sizeof(union srp_iu)); |
1203 | login->req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | | |
1204 | SRP_BUF_FORMAT_INDIRECT); | |
3507e13f BK |
1205 | |
1206 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1207 | /* Start out with a request limit of 0, since this is negotiated in | |
1208 | * the login request we are just sending and login requests always | |
1209 | * get sent by the driver regardless of request_limit. | |
1210 | */ | |
1211 | atomic_set(&hostdata->request_limit, 0); | |
1212 | ||
1213 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2); | |
1214 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1215 | dev_info(hostdata->dev, "sent SRP login\n"); | |
1216 | return rc; | |
1217 | }; | |
1218 | ||
126c5cc3 BK |
1219 | /** |
1220 | * capabilities_rsp: - Handle response to MAD adapter capabilities request | |
1221 | * @evt_struct: srp_event_struct with the response | |
1222 | * | |
1223 | * Used as a "done" callback by when sending adapter_info. | |
1224 | */ | |
1225 | static void capabilities_rsp(struct srp_event_struct *evt_struct) | |
1226 | { | |
1227 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
1228 | ||
1229 | if (evt_struct->xfer_iu->mad.capabilities.common.status) { | |
1230 | dev_err(hostdata->dev, "error 0x%X getting capabilities info\n", | |
1231 | evt_struct->xfer_iu->mad.capabilities.common.status); | |
1232 | } else { | |
72264eb6 AB |
1233 | if (hostdata->caps.migration.common.server_support != |
1234 | cpu_to_be16(SERVER_SUPPORTS_CAP)) | |
126c5cc3 BK |
1235 | dev_info(hostdata->dev, "Partition migration not supported\n"); |
1236 | ||
1237 | if (client_reserve) { | |
1238 | if (hostdata->caps.reserve.common.server_support == | |
72264eb6 | 1239 | cpu_to_be16(SERVER_SUPPORTS_CAP)) |
126c5cc3 BK |
1240 | dev_info(hostdata->dev, "Client reserve enabled\n"); |
1241 | else | |
1242 | dev_info(hostdata->dev, "Client reserve not supported\n"); | |
1243 | } | |
1244 | } | |
1245 | ||
1246 | send_srp_login(hostdata); | |
1247 | } | |
1248 | ||
1249 | /** | |
1250 | * send_mad_capabilities: - Sends the mad capabilities request | |
1251 | * and stores the result so it can be retrieved with | |
1252 | * @hostdata: ibmvscsi_host_data of host | |
1253 | */ | |
1254 | static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata) | |
1255 | { | |
1256 | struct viosrp_capabilities *req; | |
1257 | struct srp_event_struct *evt_struct; | |
1258 | unsigned long flags; | |
61c7a080 | 1259 | struct device_node *of_node = hostdata->dev->of_node; |
126c5cc3 BK |
1260 | const char *location; |
1261 | ||
1262 | evt_struct = get_event_struct(&hostdata->pool); | |
1263 | BUG_ON(!evt_struct); | |
1264 | ||
1265 | init_event_struct(evt_struct, capabilities_rsp, | |
1266 | VIOSRP_MAD_FORMAT, info_timeout); | |
1267 | ||
1268 | req = &evt_struct->iu.mad.capabilities; | |
1269 | memset(req, 0, sizeof(*req)); | |
1270 | ||
72264eb6 | 1271 | hostdata->caps.flags = cpu_to_be32(CAP_LIST_SUPPORTED); |
126c5cc3 | 1272 | if (hostdata->client_migrated) |
72264eb6 | 1273 | hostdata->caps.flags |= cpu_to_be32(CLIENT_MIGRATED); |
126c5cc3 BK |
1274 | |
1275 | strncpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev), | |
1276 | sizeof(hostdata->caps.name)); | |
1277 | hostdata->caps.name[sizeof(hostdata->caps.name) - 1] = '\0'; | |
1278 | ||
1279 | location = of_get_property(of_node, "ibm,loc-code", NULL); | |
1280 | location = location ? location : dev_name(hostdata->dev); | |
1281 | strncpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc)); | |
1282 | hostdata->caps.loc[sizeof(hostdata->caps.loc) - 1] = '\0'; | |
1283 | ||
72264eb6 AB |
1284 | req->common.type = cpu_to_be32(VIOSRP_CAPABILITIES_TYPE); |
1285 | req->buffer = cpu_to_be64(hostdata->caps_addr); | |
126c5cc3 | 1286 | |
72264eb6 AB |
1287 | hostdata->caps.migration.common.cap_type = |
1288 | cpu_to_be32(MIGRATION_CAPABILITIES); | |
1289 | hostdata->caps.migration.common.length = | |
1290 | cpu_to_be16(sizeof(hostdata->caps.migration)); | |
1291 | hostdata->caps.migration.common.server_support = | |
1292 | cpu_to_be16(SERVER_SUPPORTS_CAP); | |
1293 | hostdata->caps.migration.ecl = cpu_to_be32(1); | |
126c5cc3 BK |
1294 | |
1295 | if (client_reserve) { | |
72264eb6 AB |
1296 | hostdata->caps.reserve.common.cap_type = |
1297 | cpu_to_be32(RESERVATION_CAPABILITIES); | |
1298 | hostdata->caps.reserve.common.length = | |
1299 | cpu_to_be16(sizeof(hostdata->caps.reserve)); | |
1300 | hostdata->caps.reserve.common.server_support = | |
1301 | cpu_to_be16(SERVER_SUPPORTS_CAP); | |
1302 | hostdata->caps.reserve.type = | |
1303 | cpu_to_be32(CLIENT_RESERVE_SCSI_2); | |
1304 | req->common.length = | |
1305 | cpu_to_be16(sizeof(hostdata->caps)); | |
126c5cc3 | 1306 | } else |
72264eb6 AB |
1307 | req->common.length = cpu_to_be16(sizeof(hostdata->caps) - |
1308 | sizeof(hostdata->caps.reserve)); | |
126c5cc3 BK |
1309 | |
1310 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1311 | if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) | |
1312 | dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n"); | |
1313 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1314 | }; | |
1315 | ||
c1988e31 RJ |
1316 | /** |
1317 | * fast_fail_rsp: - Handle response to MAD enable fast fail | |
1318 | * @evt_struct: srp_event_struct with the response | |
1319 | * | |
1320 | * Used as a "done" callback by when sending enable fast fail. Gets called | |
1321 | * by ibmvscsi_handle_crq() | |
1322 | */ | |
1323 | static void fast_fail_rsp(struct srp_event_struct *evt_struct) | |
1324 | { | |
1325 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
72264eb6 | 1326 | u16 status = be16_to_cpu(evt_struct->xfer_iu->mad.fast_fail.common.status); |
c1988e31 RJ |
1327 | |
1328 | if (status == VIOSRP_MAD_NOT_SUPPORTED) | |
1329 | dev_err(hostdata->dev, "fast_fail not supported in server\n"); | |
1330 | else if (status == VIOSRP_MAD_FAILED) | |
1331 | dev_err(hostdata->dev, "fast_fail request failed\n"); | |
1332 | else if (status != VIOSRP_MAD_SUCCESS) | |
1333 | dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status); | |
1334 | ||
126c5cc3 | 1335 | send_mad_capabilities(hostdata); |
c1988e31 RJ |
1336 | } |
1337 | ||
1338 | /** | |
1339 | * init_host - Start host initialization | |
1340 | * @hostdata: ibmvscsi_host_data of host | |
1341 | * | |
1342 | * Returns zero if successful. | |
1343 | */ | |
1344 | static int enable_fast_fail(struct ibmvscsi_host_data *hostdata) | |
1345 | { | |
1346 | int rc; | |
1347 | unsigned long flags; | |
1348 | struct viosrp_fast_fail *fast_fail_mad; | |
1349 | struct srp_event_struct *evt_struct; | |
1350 | ||
126c5cc3 BK |
1351 | if (!fast_fail) { |
1352 | send_mad_capabilities(hostdata); | |
1353 | return 0; | |
1354 | } | |
c1988e31 RJ |
1355 | |
1356 | evt_struct = get_event_struct(&hostdata->pool); | |
1357 | BUG_ON(!evt_struct); | |
1358 | ||
1359 | init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout); | |
1360 | ||
1361 | fast_fail_mad = &evt_struct->iu.mad.fast_fail; | |
1362 | memset(fast_fail_mad, 0, sizeof(*fast_fail_mad)); | |
72264eb6 AB |
1363 | fast_fail_mad->common.type = cpu_to_be32(VIOSRP_ENABLE_FAST_FAIL); |
1364 | fast_fail_mad->common.length = cpu_to_be16(sizeof(*fast_fail_mad)); | |
c1988e31 RJ |
1365 | |
1366 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1367 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2); | |
1368 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1369 | return rc; | |
1370 | } | |
1371 | ||
1da177e4 LT |
1372 | /** |
1373 | * adapter_info_rsp: - Handle response to MAD adapter info request | |
1374 | * @evt_struct: srp_event_struct with the response | |
1375 | * | |
1376 | * Used as a "done" callback by when sending adapter_info. Gets called | |
1377 | * by ibmvscsi_handle_crq() | |
1378 | */ | |
1379 | static void adapter_info_rsp(struct srp_event_struct *evt_struct) | |
1380 | { | |
1381 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
1da177e4 LT |
1382 | |
1383 | if (evt_struct->xfer_iu->mad.adapter_info.common.status) { | |
6c0a60ec BK |
1384 | dev_err(hostdata->dev, "error %d getting adapter info\n", |
1385 | evt_struct->xfer_iu->mad.adapter_info.common.status); | |
1da177e4 | 1386 | } else { |
6c0a60ec BK |
1387 | dev_info(hostdata->dev, "host srp version: %s, " |
1388 | "host partition %s (%d), OS %d, max io %u\n", | |
1389 | hostdata->madapter_info.srp_version, | |
1390 | hostdata->madapter_info.partition_name, | |
72264eb6 AB |
1391 | be32_to_cpu(hostdata->madapter_info.partition_number), |
1392 | be32_to_cpu(hostdata->madapter_info.os_type), | |
1393 | be32_to_cpu(hostdata->madapter_info.port_max_txu[0])); | |
1da177e4 LT |
1394 | |
1395 | if (hostdata->madapter_info.port_max_txu[0]) | |
1396 | hostdata->host->max_sectors = | |
72264eb6 | 1397 | be32_to_cpu(hostdata->madapter_info.port_max_txu[0]) >> 9; |
154fb614 | 1398 | |
45d8c30f | 1399 | if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX && |
154fb614 | 1400 | strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) { |
6c0a60ec BK |
1401 | dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n", |
1402 | hostdata->madapter_info.srp_version); | |
1403 | dev_err(hostdata->dev, "limiting scatterlists to %d\n", | |
1404 | MAX_INDIRECT_BUFS); | |
154fb614 DB |
1405 | hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS; |
1406 | } | |
e08afeb7 | 1407 | |
45d8c30f | 1408 | if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX) { |
e08afeb7 BK |
1409 | enable_fast_fail(hostdata); |
1410 | return; | |
1411 | } | |
1da177e4 | 1412 | } |
3507e13f | 1413 | |
e08afeb7 | 1414 | send_srp_login(hostdata); |
1da177e4 LT |
1415 | } |
1416 | ||
1417 | /** | |
1418 | * send_mad_adapter_info: - Sends the mad adapter info request | |
1419 | * and stores the result so it can be retrieved with | |
1420 | * sysfs. We COULD consider causing a failure if the | |
1421 | * returned SRP version doesn't match ours. | |
1422 | * @hostdata: ibmvscsi_host_data of host | |
1423 | * | |
1424 | * Returns zero if successful. | |
1425 | */ | |
1426 | static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata) | |
1427 | { | |
1428 | struct viosrp_adapter_info *req; | |
1429 | struct srp_event_struct *evt_struct; | |
06f923cb | 1430 | unsigned long flags; |
e5dbfa66 | 1431 | |
1da177e4 | 1432 | evt_struct = get_event_struct(&hostdata->pool); |
3507e13f | 1433 | BUG_ON(!evt_struct); |
1da177e4 LT |
1434 | |
1435 | init_event_struct(evt_struct, | |
1436 | adapter_info_rsp, | |
1437 | VIOSRP_MAD_FORMAT, | |
e1a5ce5b | 1438 | info_timeout); |
1da177e4 LT |
1439 | |
1440 | req = &evt_struct->iu.mad.adapter_info; | |
1441 | memset(req, 0x00, sizeof(*req)); | |
1442 | ||
72264eb6 AB |
1443 | req->common.type = cpu_to_be32(VIOSRP_ADAPTER_INFO_TYPE); |
1444 | req->common.length = cpu_to_be16(sizeof(hostdata->madapter_info)); | |
1445 | req->buffer = cpu_to_be64(hostdata->adapter_info_addr); | |
1da177e4 | 1446 | |
06f923cb | 1447 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
126c5cc3 | 1448 | if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) |
6c0a60ec | 1449 | dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n"); |
06f923cb | 1450 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1451 | }; |
1452 | ||
1453 | /** | |
3507e13f | 1454 | * init_adapter: Start virtual adapter initialization sequence |
1da177e4 | 1455 | * |
3507e13f BK |
1456 | */ |
1457 | static void init_adapter(struct ibmvscsi_host_data *hostdata) | |
1da177e4 | 1458 | { |
1da177e4 | 1459 | send_mad_adapter_info(hostdata); |
1da177e4 LT |
1460 | } |
1461 | ||
1da177e4 LT |
1462 | /** |
1463 | * sync_completion: Signal that a synchronous command has completed | |
1464 | * Note that after returning from this call, the evt_struct is freed. | |
1465 | * the caller waiting on this completion shouldn't touch the evt_struct | |
1466 | * again. | |
1467 | */ | |
1468 | static void sync_completion(struct srp_event_struct *evt_struct) | |
1469 | { | |
1470 | /* copy the response back */ | |
1471 | if (evt_struct->sync_srp) | |
1472 | *evt_struct->sync_srp = *evt_struct->xfer_iu; | |
1473 | ||
1474 | complete(&evt_struct->comp); | |
1475 | } | |
1476 | ||
1477 | /** | |
1478 | * ibmvscsi_abort: Abort a command...from scsi host template | |
1479 | * send this over to the server and wait synchronously for the response | |
1480 | */ | |
1481 | static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd) | |
1482 | { | |
7603e02e | 1483 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 LT |
1484 | struct srp_tsk_mgmt *tsk_mgmt; |
1485 | struct srp_event_struct *evt; | |
1486 | struct srp_event_struct *tmp_evt, *found_evt; | |
1487 | union viosrp_iu srp_rsp; | |
1488 | int rsp_rc; | |
be042f24 | 1489 | unsigned long flags; |
1da177e4 | 1490 | u16 lun = lun_from_dev(cmd->device); |
860784c8 | 1491 | unsigned long wait_switch = 0; |
1da177e4 LT |
1492 | |
1493 | /* First, find this command in our sent list so we can figure | |
1494 | * out the correct tag | |
1495 | */ | |
be042f24 | 1496 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
860784c8 RJ |
1497 | wait_switch = jiffies + (init_timeout * HZ); |
1498 | do { | |
1499 | found_evt = NULL; | |
1500 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
1501 | if (tmp_evt->cmnd == cmd) { | |
1502 | found_evt = tmp_evt; | |
1503 | break; | |
1504 | } | |
1da177e4 | 1505 | } |
1da177e4 | 1506 | |
860784c8 RJ |
1507 | if (!found_evt) { |
1508 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1509 | return SUCCESS; | |
1510 | } | |
1da177e4 | 1511 | |
860784c8 RJ |
1512 | evt = get_event_struct(&hostdata->pool); |
1513 | if (evt == NULL) { | |
1514 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1515 | sdev_printk(KERN_ERR, cmd->device, | |
1516 | "failed to allocate abort event\n"); | |
1517 | return FAILED; | |
1518 | } | |
1da177e4 | 1519 | |
860784c8 RJ |
1520 | init_event_struct(evt, |
1521 | sync_completion, | |
1522 | VIOSRP_SRP_FORMAT, | |
e1a5ce5b | 1523 | abort_timeout); |
1da177e4 | 1524 | |
860784c8 | 1525 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
1da177e4 | 1526 | |
860784c8 RJ |
1527 | /* Set up an abort SRP command */ |
1528 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
1529 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
985aa495 | 1530 | int_to_scsilun(lun, &tsk_mgmt->lun); |
860784c8 RJ |
1531 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK; |
1532 | tsk_mgmt->task_tag = (u64) found_evt; | |
1533 | ||
1534 | evt->sync_srp = &srp_rsp; | |
1535 | ||
1536 | init_completion(&evt->comp); | |
e1a5ce5b | 1537 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2); |
860784c8 RJ |
1538 | |
1539 | if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) | |
1540 | break; | |
1541 | ||
1542 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1543 | msleep(10); | |
1544 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1545 | } while (time_before(jiffies, wait_switch)); | |
1546 | ||
be042f24 | 1547 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
860784c8 | 1548 | |
be042f24 | 1549 | if (rsp_rc != 0) { |
6c0a60ec BK |
1550 | sdev_printk(KERN_ERR, cmd->device, |
1551 | "failed to send abort() event. rc=%d\n", rsp_rc); | |
1da177e4 LT |
1552 | return FAILED; |
1553 | } | |
1554 | ||
860784c8 | 1555 | sdev_printk(KERN_INFO, cmd->device, |
fe333321 | 1556 | "aborting command. lun 0x%llx, tag 0x%llx\n", |
860784c8 RJ |
1557 | (((u64) lun) << 48), (u64) found_evt); |
1558 | ||
1da177e4 | 1559 | wait_for_completion(&evt->comp); |
1da177e4 LT |
1560 | |
1561 | /* make sure we got a good response */ | |
ef265673 | 1562 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 | 1563 | if (printk_ratelimit()) |
6c0a60ec BK |
1564 | sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n", |
1565 | srp_rsp.srp.rsp.opcode); | |
1da177e4 LT |
1566 | return FAILED; |
1567 | } | |
1568 | ||
ef265673 FT |
1569 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1570 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1571 | else |
1572 | rsp_rc = srp_rsp.srp.rsp.status; | |
1573 | ||
1574 | if (rsp_rc) { | |
1575 | if (printk_ratelimit()) | |
6c0a60ec | 1576 | sdev_printk(KERN_WARNING, cmd->device, |
fe333321 | 1577 | "abort code %d for task tag 0x%llx\n", |
6c0a60ec | 1578 | rsp_rc, tsk_mgmt->task_tag); |
1da177e4 LT |
1579 | return FAILED; |
1580 | } | |
1581 | ||
1582 | /* Because we dropped the spinlock above, it's possible | |
1583 | * The event is no longer in our list. Make sure it didn't | |
1584 | * complete while we were aborting | |
1585 | */ | |
be042f24 | 1586 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1587 | found_evt = NULL; |
1588 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
1589 | if (tmp_evt->cmnd == cmd) { | |
1590 | found_evt = tmp_evt; | |
1591 | break; | |
1592 | } | |
1593 | } | |
1594 | ||
1595 | if (found_evt == NULL) { | |
be042f24 | 1596 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
fe333321 | 1597 | sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n", |
6c0a60ec | 1598 | tsk_mgmt->task_tag); |
1da177e4 LT |
1599 | return SUCCESS; |
1600 | } | |
1601 | ||
fe333321 | 1602 | sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n", |
6c0a60ec | 1603 | tsk_mgmt->task_tag); |
1da177e4 LT |
1604 | |
1605 | cmd->result = (DID_ABORT << 16); | |
1606 | list_del(&found_evt->list); | |
4dddbc26 JB |
1607 | unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt, |
1608 | found_evt->hostdata->dev); | |
1da177e4 | 1609 | free_event_struct(&found_evt->hostdata->pool, found_evt); |
be042f24 | 1610 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1611 | atomic_inc(&hostdata->request_limit); |
1612 | return SUCCESS; | |
1613 | } | |
1614 | ||
1615 | /** | |
1616 | * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host | |
1617 | * template send this over to the server and wait synchronously for the | |
1618 | * response | |
1619 | */ | |
1620 | static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd) | |
1621 | { | |
7603e02e | 1622 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 LT |
1623 | struct srp_tsk_mgmt *tsk_mgmt; |
1624 | struct srp_event_struct *evt; | |
1625 | struct srp_event_struct *tmp_evt, *pos; | |
1626 | union viosrp_iu srp_rsp; | |
1627 | int rsp_rc; | |
be042f24 | 1628 | unsigned long flags; |
1da177e4 | 1629 | u16 lun = lun_from_dev(cmd->device); |
860784c8 | 1630 | unsigned long wait_switch = 0; |
1da177e4 | 1631 | |
be042f24 | 1632 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
860784c8 RJ |
1633 | wait_switch = jiffies + (init_timeout * HZ); |
1634 | do { | |
1635 | evt = get_event_struct(&hostdata->pool); | |
1636 | if (evt == NULL) { | |
1637 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1638 | sdev_printk(KERN_ERR, cmd->device, | |
1639 | "failed to allocate reset event\n"); | |
1640 | return FAILED; | |
1641 | } | |
1da177e4 | 1642 | |
860784c8 RJ |
1643 | init_event_struct(evt, |
1644 | sync_completion, | |
1645 | VIOSRP_SRP_FORMAT, | |
e1a5ce5b | 1646 | reset_timeout); |
1da177e4 | 1647 | |
860784c8 | 1648 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
1da177e4 | 1649 | |
860784c8 RJ |
1650 | /* Set up a lun reset SRP command */ |
1651 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
1652 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
985aa495 | 1653 | int_to_scsilun(lun, &tsk_mgmt->lun); |
860784c8 | 1654 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET; |
1da177e4 | 1655 | |
860784c8 RJ |
1656 | evt->sync_srp = &srp_rsp; |
1657 | ||
1658 | init_completion(&evt->comp); | |
e1a5ce5b | 1659 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2); |
860784c8 RJ |
1660 | |
1661 | if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) | |
1662 | break; | |
1663 | ||
1664 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1665 | msleep(10); | |
1666 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1667 | } while (time_before(jiffies, wait_switch)); | |
1da177e4 | 1668 | |
be042f24 | 1669 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
860784c8 | 1670 | |
be042f24 | 1671 | if (rsp_rc != 0) { |
6c0a60ec BK |
1672 | sdev_printk(KERN_ERR, cmd->device, |
1673 | "failed to send reset event. rc=%d\n", rsp_rc); | |
1da177e4 LT |
1674 | return FAILED; |
1675 | } | |
1676 | ||
fe333321 | 1677 | sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n", |
860784c8 RJ |
1678 | (((u64) lun) << 48)); |
1679 | ||
1da177e4 | 1680 | wait_for_completion(&evt->comp); |
1da177e4 LT |
1681 | |
1682 | /* make sure we got a good response */ | |
ef265673 | 1683 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 | 1684 | if (printk_ratelimit()) |
6c0a60ec BK |
1685 | sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n", |
1686 | srp_rsp.srp.rsp.opcode); | |
1da177e4 LT |
1687 | return FAILED; |
1688 | } | |
1689 | ||
ef265673 FT |
1690 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1691 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1692 | else |
1693 | rsp_rc = srp_rsp.srp.rsp.status; | |
1694 | ||
1695 | if (rsp_rc) { | |
1696 | if (printk_ratelimit()) | |
6c0a60ec | 1697 | sdev_printk(KERN_WARNING, cmd->device, |
fe333321 | 1698 | "reset code %d for task tag 0x%llx\n", |
6c0a60ec | 1699 | rsp_rc, tsk_mgmt->task_tag); |
1da177e4 LT |
1700 | return FAILED; |
1701 | } | |
1702 | ||
1703 | /* We need to find all commands for this LUN that have not yet been | |
1704 | * responded to, and fail them with DID_RESET | |
1705 | */ | |
be042f24 | 1706 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1707 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { |
1708 | if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) { | |
1709 | if (tmp_evt->cmnd) | |
1710 | tmp_evt->cmnd->result = (DID_RESET << 16); | |
1711 | list_del(&tmp_evt->list); | |
4dddbc26 JB |
1712 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt, |
1713 | tmp_evt->hostdata->dev); | |
1da177e4 LT |
1714 | free_event_struct(&tmp_evt->hostdata->pool, |
1715 | tmp_evt); | |
1716 | atomic_inc(&hostdata->request_limit); | |
1717 | if (tmp_evt->cmnd_done) | |
1718 | tmp_evt->cmnd_done(tmp_evt->cmnd); | |
1719 | else if (tmp_evt->done) | |
1720 | tmp_evt->done(tmp_evt); | |
1721 | } | |
1722 | } | |
be042f24 | 1723 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1724 | return SUCCESS; |
1725 | } | |
1726 | ||
1727 | /** | |
3d0e91f7 BK |
1728 | * ibmvscsi_eh_host_reset_handler - Reset the connection to the server |
1729 | * @cmd: struct scsi_cmnd having problems | |
1730 | */ | |
1731 | static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd) | |
1da177e4 | 1732 | { |
3d0e91f7 | 1733 | unsigned long wait_switch = 0; |
7603e02e | 1734 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 | 1735 | |
3d0e91f7 BK |
1736 | dev_err(hostdata->dev, "Resetting connection due to error recovery\n"); |
1737 | ||
1738 | ibmvscsi_reset_host(hostdata); | |
1739 | ||
1740 | for (wait_switch = jiffies + (init_timeout * HZ); | |
1741 | time_before(jiffies, wait_switch) && | |
1742 | atomic_read(&hostdata->request_limit) < 2;) { | |
1743 | ||
1744 | msleep(10); | |
1da177e4 | 1745 | } |
3d0e91f7 BK |
1746 | |
1747 | if (atomic_read(&hostdata->request_limit) <= 0) | |
1748 | return FAILED; | |
1749 | ||
1750 | return SUCCESS; | |
1da177e4 LT |
1751 | } |
1752 | ||
1753 | /** | |
1754 | * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ | |
1755 | * @crq: Command/Response queue | |
1756 | * @hostdata: ibmvscsi_host_data of host | |
1757 | * | |
1758 | */ | |
9965c2f1 BH |
1759 | static void ibmvscsi_handle_crq(struct viosrp_crq *crq, |
1760 | struct ibmvscsi_host_data *hostdata) | |
1da177e4 | 1761 | { |
6c0a60ec | 1762 | long rc; |
1da177e4 | 1763 | unsigned long flags; |
72264eb6 | 1764 | /* The hypervisor copies our tag value here so no byteswapping */ |
1da177e4 | 1765 | struct srp_event_struct *evt_struct = |
72264eb6 | 1766 | (__force struct srp_event_struct *)crq->IU_data_ptr; |
1da177e4 | 1767 | switch (crq->valid) { |
55c9b1e5 | 1768 | case VIOSRP_CRQ_INIT_RSP: /* initialization */ |
1da177e4 | 1769 | switch (crq->format) { |
55c9b1e5 | 1770 | case VIOSRP_CRQ_INIT: /* Initialization message */ |
6c0a60ec | 1771 | dev_info(hostdata->dev, "partner initialized\n"); |
1da177e4 | 1772 | /* Send back a response */ |
9965c2f1 BH |
1773 | rc = ibmvscsi_send_crq(hostdata, 0xC002000000000000LL, 0); |
1774 | if (rc == 0) { | |
1da177e4 | 1775 | /* Now login */ |
3507e13f | 1776 | init_adapter(hostdata); |
1da177e4 | 1777 | } else { |
6c0a60ec | 1778 | dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc); |
1da177e4 LT |
1779 | } |
1780 | ||
1781 | break; | |
55c9b1e5 | 1782 | case VIOSRP_CRQ_INIT_COMPLETE: /* Initialization response */ |
6c0a60ec | 1783 | dev_info(hostdata->dev, "partner initialization complete\n"); |
1da177e4 LT |
1784 | |
1785 | /* Now login */ | |
3507e13f | 1786 | init_adapter(hostdata); |
1da177e4 LT |
1787 | break; |
1788 | default: | |
6c0a60ec | 1789 | dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format); |
1da177e4 LT |
1790 | } |
1791 | return; | |
55c9b1e5 | 1792 | case VIOSRP_CRQ_XPORT_EVENT: /* Hypervisor telling us the connection is closed */ |
2b541f8f | 1793 | scsi_block_requests(hostdata->host); |
cefbda2d | 1794 | atomic_set(&hostdata->request_limit, 0); |
2b541f8f DB |
1795 | if (crq->format == 0x06) { |
1796 | /* We need to re-setup the interpartition connection */ | |
6c0a60ec | 1797 | dev_info(hostdata->dev, "Re-enabling adapter!\n"); |
126c5cc3 | 1798 | hostdata->client_migrated = 1; |
0f33ece5 | 1799 | hostdata->reenable_crq = 1; |
2b541f8f | 1800 | purge_requests(hostdata, DID_REQUEUE); |
0f33ece5 | 1801 | wake_up(&hostdata->work_wait_q); |
2b541f8f | 1802 | } else { |
6c0a60ec BK |
1803 | dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n", |
1804 | crq->format); | |
0f33ece5 | 1805 | ibmvscsi_reset_host(hostdata); |
2b541f8f | 1806 | } |
1da177e4 | 1807 | return; |
55c9b1e5 | 1808 | case VIOSRP_CRQ_CMD_RSP: /* real payload */ |
1da177e4 LT |
1809 | break; |
1810 | default: | |
6c0a60ec BK |
1811 | dev_err(hostdata->dev, "got an invalid message type 0x%02x\n", |
1812 | crq->valid); | |
1da177e4 LT |
1813 | return; |
1814 | } | |
1815 | ||
1816 | /* The only kind of payload CRQs we should get are responses to | |
1817 | * things we send. Make sure this response is to something we | |
1818 | * actually sent | |
1819 | */ | |
1820 | if (!valid_event_struct(&hostdata->pool, evt_struct)) { | |
6c0a60ec | 1821 | dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n", |
72264eb6 | 1822 | evt_struct); |
1da177e4 LT |
1823 | return; |
1824 | } | |
1825 | ||
1826 | if (atomic_read(&evt_struct->free)) { | |
6c0a60ec | 1827 | dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n", |
72264eb6 | 1828 | evt_struct); |
1da177e4 LT |
1829 | return; |
1830 | } | |
1831 | ||
1832 | if (crq->format == VIOSRP_SRP_FORMAT) | |
72264eb6 | 1833 | atomic_add(be32_to_cpu(evt_struct->xfer_iu->srp.rsp.req_lim_delta), |
1da177e4 LT |
1834 | &hostdata->request_limit); |
1835 | ||
3d0e91f7 BK |
1836 | del_timer(&evt_struct->timer); |
1837 | ||
ca61668b | 1838 | if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd) |
c3a3b55a | 1839 | evt_struct->cmnd->result = DID_ERROR << 16; |
1da177e4 LT |
1840 | if (evt_struct->done) |
1841 | evt_struct->done(evt_struct); | |
1842 | else | |
6c0a60ec | 1843 | dev_err(hostdata->dev, "returned done() is NULL; not running it!\n"); |
1da177e4 LT |
1844 | |
1845 | /* | |
1846 | * Lock the host_lock before messing with these structures, since we | |
1847 | * are running in a task context | |
1848 | */ | |
1849 | spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags); | |
1850 | list_del(&evt_struct->list); | |
1851 | free_event_struct(&evt_struct->hostdata->pool, evt_struct); | |
1852 | spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags); | |
1853 | } | |
1854 | ||
0979c84b RJ |
1855 | /** |
1856 | * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk. | |
1857 | * @sdev: struct scsi_device device to configure | |
1858 | * | |
1859 | * Enable allow_restart for a device if it is a disk. Adjust the | |
1860 | * queue_depth here also as is required by the documentation for | |
1861 | * struct scsi_host_template. | |
1862 | */ | |
1863 | static int ibmvscsi_slave_configure(struct scsi_device *sdev) | |
1864 | { | |
1865 | struct Scsi_Host *shost = sdev->host; | |
1866 | unsigned long lock_flags = 0; | |
1867 | ||
1868 | spin_lock_irqsave(shost->host_lock, lock_flags); | |
d1a357fc | 1869 | if (sdev->type == TYPE_DISK) { |
0979c84b | 1870 | sdev->allow_restart = 1; |
e1a5ce5b | 1871 | blk_queue_rq_timeout(sdev->request_queue, 120 * HZ); |
d1a357fc | 1872 | } |
0979c84b RJ |
1873 | spin_unlock_irqrestore(shost->host_lock, lock_flags); |
1874 | return 0; | |
1875 | } | |
1876 | ||
742d25b8 BK |
1877 | /** |
1878 | * ibmvscsi_change_queue_depth - Change the device's queue depth | |
1879 | * @sdev: scsi device struct | |
1880 | * @qdepth: depth to set | |
e881a172 | 1881 | * @reason: calling context |
742d25b8 BK |
1882 | * |
1883 | * Return value: | |
1884 | * actual depth set | |
1885 | **/ | |
db5ed4df | 1886 | static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth) |
742d25b8 BK |
1887 | { |
1888 | if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN) | |
1889 | qdepth = IBMVSCSI_MAX_CMDS_PER_LUN; | |
db5ed4df | 1890 | return scsi_change_queue_depth(sdev, qdepth); |
742d25b8 BK |
1891 | } |
1892 | ||
1da177e4 LT |
1893 | /* ------------------------------------------------------------ |
1894 | * sysfs attributes | |
1895 | */ | |
126c5cc3 BK |
1896 | static ssize_t show_host_vhost_loc(struct device *dev, |
1897 | struct device_attribute *attr, char *buf) | |
1898 | { | |
1899 | struct Scsi_Host *shost = class_to_shost(dev); | |
1900 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); | |
1901 | int len; | |
1902 | ||
1903 | len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n", | |
1904 | hostdata->caps.loc); | |
1905 | return len; | |
1906 | } | |
1907 | ||
1908 | static struct device_attribute ibmvscsi_host_vhost_loc = { | |
1909 | .attr = { | |
1910 | .name = "vhost_loc", | |
1911 | .mode = S_IRUGO, | |
1912 | }, | |
1913 | .show = show_host_vhost_loc, | |
1914 | }; | |
1915 | ||
1916 | static ssize_t show_host_vhost_name(struct device *dev, | |
1917 | struct device_attribute *attr, char *buf) | |
1918 | { | |
1919 | struct Scsi_Host *shost = class_to_shost(dev); | |
1920 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); | |
1921 | int len; | |
1922 | ||
1923 | len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n", | |
1924 | hostdata->caps.name); | |
1925 | return len; | |
1926 | } | |
1927 | ||
1928 | static struct device_attribute ibmvscsi_host_vhost_name = { | |
1929 | .attr = { | |
1930 | .name = "vhost_name", | |
1931 | .mode = S_IRUGO, | |
1932 | }, | |
1933 | .show = show_host_vhost_name, | |
1934 | }; | |
1935 | ||
ee959b00 TJ |
1936 | static ssize_t show_host_srp_version(struct device *dev, |
1937 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1938 | { |
ee959b00 | 1939 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1940 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1941 | int len; |
1942 | ||
1943 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1944 | hostdata->madapter_info.srp_version); | |
1945 | return len; | |
1946 | } | |
1947 | ||
ee959b00 | 1948 | static struct device_attribute ibmvscsi_host_srp_version = { |
1da177e4 LT |
1949 | .attr = { |
1950 | .name = "srp_version", | |
1951 | .mode = S_IRUGO, | |
1952 | }, | |
1953 | .show = show_host_srp_version, | |
1954 | }; | |
1955 | ||
ee959b00 TJ |
1956 | static ssize_t show_host_partition_name(struct device *dev, |
1957 | struct device_attribute *attr, | |
1da177e4 LT |
1958 | char *buf) |
1959 | { | |
ee959b00 | 1960 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1961 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1962 | int len; |
1963 | ||
1964 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1965 | hostdata->madapter_info.partition_name); | |
1966 | return len; | |
1967 | } | |
1968 | ||
ee959b00 | 1969 | static struct device_attribute ibmvscsi_host_partition_name = { |
1da177e4 LT |
1970 | .attr = { |
1971 | .name = "partition_name", | |
1972 | .mode = S_IRUGO, | |
1973 | }, | |
1974 | .show = show_host_partition_name, | |
1975 | }; | |
1976 | ||
ee959b00 TJ |
1977 | static ssize_t show_host_partition_number(struct device *dev, |
1978 | struct device_attribute *attr, | |
1da177e4 LT |
1979 | char *buf) |
1980 | { | |
ee959b00 | 1981 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1982 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1983 | int len; |
1984 | ||
1985 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
f36948cb | 1986 | be32_to_cpu(hostdata->madapter_info.partition_number)); |
1da177e4 LT |
1987 | return len; |
1988 | } | |
1989 | ||
ee959b00 | 1990 | static struct device_attribute ibmvscsi_host_partition_number = { |
1da177e4 LT |
1991 | .attr = { |
1992 | .name = "partition_number", | |
1993 | .mode = S_IRUGO, | |
1994 | }, | |
1995 | .show = show_host_partition_number, | |
1996 | }; | |
1997 | ||
ee959b00 TJ |
1998 | static ssize_t show_host_mad_version(struct device *dev, |
1999 | struct device_attribute *attr, char *buf) | |
1da177e4 | 2000 | { |
ee959b00 | 2001 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 2002 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
2003 | int len; |
2004 | ||
2005 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
f36948cb | 2006 | be32_to_cpu(hostdata->madapter_info.mad_version)); |
1da177e4 LT |
2007 | return len; |
2008 | } | |
2009 | ||
ee959b00 | 2010 | static struct device_attribute ibmvscsi_host_mad_version = { |
1da177e4 LT |
2011 | .attr = { |
2012 | .name = "mad_version", | |
2013 | .mode = S_IRUGO, | |
2014 | }, | |
2015 | .show = show_host_mad_version, | |
2016 | }; | |
2017 | ||
ee959b00 TJ |
2018 | static ssize_t show_host_os_type(struct device *dev, |
2019 | struct device_attribute *attr, char *buf) | |
1da177e4 | 2020 | { |
ee959b00 | 2021 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 2022 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
2023 | int len; |
2024 | ||
f36948cb TD |
2025 | len = snprintf(buf, PAGE_SIZE, "%d\n", |
2026 | be32_to_cpu(hostdata->madapter_info.os_type)); | |
1da177e4 LT |
2027 | return len; |
2028 | } | |
2029 | ||
ee959b00 | 2030 | static struct device_attribute ibmvscsi_host_os_type = { |
1da177e4 LT |
2031 | .attr = { |
2032 | .name = "os_type", | |
2033 | .mode = S_IRUGO, | |
2034 | }, | |
2035 | .show = show_host_os_type, | |
2036 | }; | |
2037 | ||
ee959b00 TJ |
2038 | static ssize_t show_host_config(struct device *dev, |
2039 | struct device_attribute *attr, char *buf) | |
1da177e4 | 2040 | { |
0a1c0ebf | 2041 | return 0; |
1da177e4 LT |
2042 | } |
2043 | ||
ee959b00 | 2044 | static struct device_attribute ibmvscsi_host_config = { |
1da177e4 | 2045 | .attr = { |
0a1c0ebf TD |
2046 | .name = "config", |
2047 | .mode = S_IRUGO, | |
2048 | }, | |
1da177e4 LT |
2049 | .show = show_host_config, |
2050 | }; | |
2051 | ||
ee959b00 | 2052 | static struct device_attribute *ibmvscsi_attrs[] = { |
126c5cc3 BK |
2053 | &ibmvscsi_host_vhost_loc, |
2054 | &ibmvscsi_host_vhost_name, | |
1da177e4 LT |
2055 | &ibmvscsi_host_srp_version, |
2056 | &ibmvscsi_host_partition_name, | |
2057 | &ibmvscsi_host_partition_number, | |
2058 | &ibmvscsi_host_mad_version, | |
2059 | &ibmvscsi_host_os_type, | |
2060 | &ibmvscsi_host_config, | |
2061 | NULL | |
2062 | }; | |
2063 | ||
2064 | /* ------------------------------------------------------------ | |
2065 | * SCSI driver registration | |
2066 | */ | |
2067 | static struct scsi_host_template driver_template = { | |
2068 | .module = THIS_MODULE, | |
2069 | .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION, | |
2070 | .proc_name = "ibmvscsi", | |
2071 | .queuecommand = ibmvscsi_queuecommand, | |
2072 | .eh_abort_handler = ibmvscsi_eh_abort_handler, | |
2073 | .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler, | |
3d0e91f7 | 2074 | .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler, |
0979c84b | 2075 | .slave_configure = ibmvscsi_slave_configure, |
742d25b8 | 2076 | .change_queue_depth = ibmvscsi_change_queue_depth, |
7912a0ac | 2077 | .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT, |
a897ff2a | 2078 | .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT, |
1da177e4 | 2079 | .this_id = -1, |
4dddbc26 | 2080 | .sg_tablesize = SG_ALL, |
1da177e4 LT |
2081 | .use_clustering = ENABLE_CLUSTERING, |
2082 | .shost_attrs = ibmvscsi_attrs, | |
2083 | }; | |
2084 | ||
7912a0ac RJ |
2085 | /** |
2086 | * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver | |
2087 | * | |
2088 | * @vdev: struct vio_dev for the device whose desired IO mem is to be returned | |
2089 | * | |
2090 | * Return value: | |
2091 | * Number of bytes of IO data the driver will need to perform well. | |
2092 | */ | |
2093 | static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev) | |
2094 | { | |
2095 | /* iu_storage data allocated in initialize_event_pool */ | |
4f10aae0 | 2096 | unsigned long desired_io = max_events * sizeof(union viosrp_iu); |
7912a0ac RJ |
2097 | |
2098 | /* add io space for sg data */ | |
004dd5e8 | 2099 | desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 * |
7912a0ac RJ |
2100 | IBMVSCSI_CMDS_PER_LUN_DEFAULT); |
2101 | ||
2102 | return desired_io; | |
2103 | } | |
2104 | ||
0f33ece5 BK |
2105 | static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata) |
2106 | { | |
2107 | int rc; | |
2108 | char *action = "reset"; | |
2109 | ||
2110 | if (hostdata->reset_crq) { | |
2111 | smp_rmb(); | |
2112 | hostdata->reset_crq = 0; | |
2113 | ||
9965c2f1 | 2114 | rc = ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata); |
0f33ece5 | 2115 | if (!rc) |
9965c2f1 | 2116 | rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0); |
201aed67 | 2117 | vio_enable_interrupts(to_vio_dev(hostdata->dev)); |
0f33ece5 BK |
2118 | } else if (hostdata->reenable_crq) { |
2119 | smp_rmb(); | |
2120 | action = "enable"; | |
9965c2f1 | 2121 | rc = ibmvscsi_reenable_crq_queue(&hostdata->queue, hostdata); |
0f33ece5 BK |
2122 | hostdata->reenable_crq = 0; |
2123 | if (!rc) | |
9965c2f1 | 2124 | rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0); |
0f33ece5 BK |
2125 | } else |
2126 | return; | |
2127 | ||
2128 | if (rc) { | |
2129 | atomic_set(&hostdata->request_limit, -1); | |
2130 | dev_err(hostdata->dev, "error after %s\n", action); | |
2131 | } | |
2132 | ||
2133 | scsi_unblock_requests(hostdata->host); | |
2134 | } | |
2135 | ||
2136 | static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata) | |
2137 | { | |
2138 | if (kthread_should_stop()) | |
2139 | return 1; | |
2140 | else if (hostdata->reset_crq) { | |
2141 | smp_rmb(); | |
2142 | return 1; | |
2143 | } else if (hostdata->reenable_crq) { | |
2144 | smp_rmb(); | |
2145 | return 1; | |
2146 | } | |
2147 | ||
2148 | return 0; | |
2149 | } | |
2150 | ||
2151 | static int ibmvscsi_work(void *data) | |
2152 | { | |
2153 | struct ibmvscsi_host_data *hostdata = data; | |
2154 | int rc; | |
2155 | ||
8698a745 | 2156 | set_user_nice(current, MIN_NICE); |
0f33ece5 BK |
2157 | |
2158 | while (1) { | |
2159 | rc = wait_event_interruptible(hostdata->work_wait_q, | |
2160 | ibmvscsi_work_to_do(hostdata)); | |
2161 | ||
2162 | BUG_ON(rc); | |
2163 | ||
2164 | if (kthread_should_stop()) | |
2165 | break; | |
2166 | ||
2167 | ibmvscsi_do_work(hostdata); | |
2168 | } | |
2169 | ||
2170 | return 0; | |
2171 | } | |
2172 | ||
1da177e4 LT |
2173 | /** |
2174 | * Called by bus code for each adapter | |
2175 | */ | |
2176 | static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id) | |
2177 | { | |
2178 | struct ibmvscsi_host_data *hostdata; | |
2179 | struct Scsi_Host *host; | |
2180 | struct device *dev = &vdev->dev; | |
4d680419 FT |
2181 | struct srp_rport_identifiers ids; |
2182 | struct srp_rport *rport; | |
1da177e4 | 2183 | unsigned long wait_switch = 0; |
cefbda2d | 2184 | int rc; |
1da177e4 | 2185 | |
559fde70 | 2186 | dev_set_drvdata(&vdev->dev, NULL); |
1da177e4 LT |
2187 | |
2188 | host = scsi_host_alloc(&driver_template, sizeof(*hostdata)); | |
2189 | if (!host) { | |
6c0a60ec | 2190 | dev_err(&vdev->dev, "couldn't allocate host data\n"); |
1da177e4 LT |
2191 | goto scsi_host_alloc_failed; |
2192 | } | |
2193 | ||
4d680419 | 2194 | host->transportt = ibmvscsi_transport_template; |
7603e02e | 2195 | hostdata = shost_priv(host); |
1da177e4 LT |
2196 | memset(hostdata, 0x00, sizeof(*hostdata)); |
2197 | INIT_LIST_HEAD(&hostdata->sent); | |
0f33ece5 | 2198 | init_waitqueue_head(&hostdata->work_wait_q); |
1da177e4 LT |
2199 | hostdata->host = host; |
2200 | hostdata->dev = dev; | |
2201 | atomic_set(&hostdata->request_limit, -1); | |
7912a0ac | 2202 | hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT; |
1da177e4 | 2203 | |
126c5cc3 BK |
2204 | if (map_persist_bufs(hostdata)) { |
2205 | dev_err(&vdev->dev, "couldn't map persistent buffers\n"); | |
2206 | goto persist_bufs_failed; | |
2207 | } | |
2208 | ||
0f33ece5 BK |
2209 | hostdata->work_thread = kthread_run(ibmvscsi_work, hostdata, "%s_%d", |
2210 | "ibmvscsi", host->host_no); | |
2211 | ||
2212 | if (IS_ERR(hostdata->work_thread)) { | |
2213 | dev_err(&vdev->dev, "couldn't initialize kthread. rc=%ld\n", | |
2214 | PTR_ERR(hostdata->work_thread)); | |
2215 | goto init_crq_failed; | |
2216 | } | |
2217 | ||
9965c2f1 | 2218 | rc = ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, max_events); |
cefbda2d | 2219 | if (rc != 0 && rc != H_RESOURCE) { |
6c0a60ec | 2220 | dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc); |
0f33ece5 | 2221 | goto kill_kthread; |
1da177e4 | 2222 | } |
4f10aae0 | 2223 | if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) { |
6c0a60ec | 2224 | dev_err(&vdev->dev, "couldn't initialize event pool\n"); |
1da177e4 LT |
2225 | goto init_pool_failed; |
2226 | } | |
2227 | ||
3467a146 | 2228 | host->max_lun = IBMVSCSI_MAX_LUN; |
1da177e4 LT |
2229 | host->max_id = max_id; |
2230 | host->max_channel = max_channel; | |
fbc56f08 | 2231 | host->max_cmd_len = 16; |
1da177e4 | 2232 | |
e3678a0c LV |
2233 | dev_info(dev, |
2234 | "Maximum ID: %d Maximum LUN: %llu Maximum Channel: %d\n", | |
2235 | host->max_id, host->max_lun, host->max_channel); | |
2236 | ||
1da177e4 LT |
2237 | if (scsi_add_host(hostdata->host, hostdata->dev)) |
2238 | goto add_host_failed; | |
2239 | ||
4d680419 FT |
2240 | /* we don't have a proper target_port_id so let's use the fake one */ |
2241 | memcpy(ids.port_id, hostdata->madapter_info.partition_name, | |
2242 | sizeof(ids.port_id)); | |
aebd5e47 | 2243 | ids.roles = SRP_RPORT_ROLE_TARGET; |
4d680419 FT |
2244 | rport = srp_rport_add(host, &ids); |
2245 | if (IS_ERR(rport)) | |
2246 | goto add_srp_port_failed; | |
2247 | ||
1da177e4 LT |
2248 | /* Try to send an initialization message. Note that this is allowed |
2249 | * to fail if the other end is not acive. In that case we don't | |
2250 | * want to scan | |
2251 | */ | |
9965c2f1 | 2252 | if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0 |
cefbda2d | 2253 | || rc == H_RESOURCE) { |
1da177e4 LT |
2254 | /* |
2255 | * Wait around max init_timeout secs for the adapter to finish | |
2256 | * initializing. When we are done initializing, we will have a | |
2257 | * valid request_limit. We don't want Linux scanning before | |
2258 | * we are ready. | |
2259 | */ | |
2260 | for (wait_switch = jiffies + (init_timeout * HZ); | |
2261 | time_before(jiffies, wait_switch) && | |
2262 | atomic_read(&hostdata->request_limit) < 2;) { | |
2263 | ||
2264 | msleep(10); | |
2265 | } | |
2266 | ||
2267 | /* if we now have a valid request_limit, initiate a scan */ | |
2268 | if (atomic_read(&hostdata->request_limit) > 0) | |
2269 | scsi_scan_host(host); | |
2270 | } | |
2271 | ||
559fde70 | 2272 | dev_set_drvdata(&vdev->dev, hostdata); |
1da177e4 LT |
2273 | return 0; |
2274 | ||
4d680419 FT |
2275 | add_srp_port_failed: |
2276 | scsi_remove_host(hostdata->host); | |
1da177e4 LT |
2277 | add_host_failed: |
2278 | release_event_pool(&hostdata->pool, hostdata); | |
2279 | init_pool_failed: | |
9965c2f1 | 2280 | ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_events); |
0f33ece5 BK |
2281 | kill_kthread: |
2282 | kthread_stop(hostdata->work_thread); | |
1da177e4 | 2283 | init_crq_failed: |
126c5cc3 BK |
2284 | unmap_persist_bufs(hostdata); |
2285 | persist_bufs_failed: | |
1da177e4 LT |
2286 | scsi_host_put(host); |
2287 | scsi_host_alloc_failed: | |
2288 | return -1; | |
2289 | } | |
2290 | ||
2291 | static int ibmvscsi_remove(struct vio_dev *vdev) | |
2292 | { | |
559fde70 | 2293 | struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev); |
126c5cc3 | 2294 | unmap_persist_bufs(hostdata); |
1da177e4 | 2295 | release_event_pool(&hostdata->pool, hostdata); |
9965c2f1 | 2296 | ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, |
4f10aae0 | 2297 | max_events); |
4d680419 | 2298 | |
0f33ece5 | 2299 | kthread_stop(hostdata->work_thread); |
4d680419 | 2300 | srp_remove_host(hostdata->host); |
1da177e4 LT |
2301 | scsi_remove_host(hostdata->host); |
2302 | scsi_host_put(hostdata->host); | |
2303 | ||
2304 | return 0; | |
2305 | } | |
2306 | ||
64355b92 BK |
2307 | /** |
2308 | * ibmvscsi_resume: Resume from suspend | |
2309 | * @dev: device struct | |
2310 | * | |
2311 | * We may have lost an interrupt across suspend/resume, so kick the | |
2312 | * interrupt handler | |
2313 | */ | |
2314 | static int ibmvscsi_resume(struct device *dev) | |
2315 | { | |
2316 | struct ibmvscsi_host_data *hostdata = dev_get_drvdata(dev); | |
9965c2f1 BH |
2317 | vio_disable_interrupts(to_vio_dev(hostdata->dev)); |
2318 | tasklet_schedule(&hostdata->srp_task); | |
2319 | ||
2320 | return 0; | |
64355b92 BK |
2321 | } |
2322 | ||
1da177e4 LT |
2323 | /** |
2324 | * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we | |
2325 | * support. | |
2326 | */ | |
6f039790 | 2327 | static struct vio_device_id ibmvscsi_device_table[] = { |
1da177e4 | 2328 | {"vscsi", "IBM,v-scsi"}, |
fb120da6 | 2329 | { "", "" } |
1da177e4 | 2330 | }; |
1da177e4 | 2331 | MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table); |
915124d8 | 2332 | |
64355b92 BK |
2333 | static struct dev_pm_ops ibmvscsi_pm_ops = { |
2334 | .resume = ibmvscsi_resume | |
2335 | }; | |
2336 | ||
1da177e4 | 2337 | static struct vio_driver ibmvscsi_driver = { |
1da177e4 LT |
2338 | .id_table = ibmvscsi_device_table, |
2339 | .probe = ibmvscsi_probe, | |
6fdf5392 | 2340 | .remove = ibmvscsi_remove, |
7912a0ac | 2341 | .get_desired_dma = ibmvscsi_get_desired_dma, |
cb52d897 BH |
2342 | .name = "ibmvscsi", |
2343 | .pm = &ibmvscsi_pm_ops, | |
1da177e4 LT |
2344 | }; |
2345 | ||
4d680419 FT |
2346 | static struct srp_function_template ibmvscsi_transport_functions = { |
2347 | }; | |
2348 | ||
1da177e4 LT |
2349 | int __init ibmvscsi_module_init(void) |
2350 | { | |
4d680419 FT |
2351 | int ret; |
2352 | ||
4f10aae0 BK |
2353 | /* Ensure we have two requests to do error recovery */ |
2354 | driver_template.can_queue = max_requests; | |
2355 | max_events = max_requests + 2; | |
2356 | ||
9965c2f1 | 2357 | if (!firmware_has_feature(FW_FEATURE_VIO)) |
d3849d51 DW |
2358 | return -ENODEV; |
2359 | ||
4d680419 FT |
2360 | ibmvscsi_transport_template = |
2361 | srp_attach_transport(&ibmvscsi_transport_functions); | |
2362 | if (!ibmvscsi_transport_template) | |
2363 | return -ENOMEM; | |
2364 | ||
2365 | ret = vio_register_driver(&ibmvscsi_driver); | |
2366 | if (ret) | |
2367 | srp_release_transport(ibmvscsi_transport_template); | |
2368 | return ret; | |
1da177e4 LT |
2369 | } |
2370 | ||
2371 | void __exit ibmvscsi_module_exit(void) | |
2372 | { | |
2373 | vio_unregister_driver(&ibmvscsi_driver); | |
4d680419 | 2374 | srp_release_transport(ibmvscsi_transport_template); |
1da177e4 LT |
2375 | } |
2376 | ||
2377 | module_init(ibmvscsi_module_init); | |
2378 | module_exit(ibmvscsi_module_exit); |