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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* ------------------------------------------------------------ |
3 | * ibmvscsi.c | |
4 | * (C) Copyright IBM Corporation 1994, 2004 | |
5 | * Authors: Colin DeVilbiss (devilbis@us.ibm.com) | |
6 | * Santiago Leon (santil@us.ibm.com) | |
7 | * Dave Boutcher (sleddog@us.ibm.com) | |
8 | * | |
1da177e4 LT |
9 | * ------------------------------------------------------------ |
10 | * Emulation of a SCSI host adapter for Virtual I/O devices | |
11 | * | |
12 | * This driver supports the SCSI adapter implemented by the IBM | |
13 | * Power5 firmware. That SCSI adapter is not a physical adapter, | |
14 | * but allows Linux SCSI peripheral drivers to directly | |
15 | * access devices in another logical partition on the physical system. | |
16 | * | |
17 | * The virtual adapter(s) are present in the open firmware device | |
18 | * tree just like real adapters. | |
19 | * | |
20 | * One of the capabilities provided on these systems is the ability | |
21 | * to DMA between partitions. The architecture states that for VSCSI, | |
22 | * the server side is allowed to DMA to and from the client. The client | |
23 | * is never trusted to DMA to or from the server directly. | |
24 | * | |
25 | * Messages are sent between partitions on a "Command/Response Queue" | |
26 | * (CRQ), which is just a buffer of 16 byte entries in the receiver's | |
27 | * Senders cannot access the buffer directly, but send messages by | |
28 | * making a hypervisor call and passing in the 16 bytes. The hypervisor | |
9b7dac08 | 29 | * puts the message in the next 16 byte space in round-robin fashion, |
1da177e4 LT |
30 | * turns on the high order bit of the message (the valid bit), and |
31 | * generates an interrupt to the receiver (if interrupts are turned on.) | |
32 | * The receiver just turns off the valid bit when they have copied out | |
33 | * the message. | |
34 | * | |
35 | * The VSCSI client builds a SCSI Remote Protocol (SRP) Information Unit | |
36 | * (IU) (as defined in the T10 standard available at www.t10.org), gets | |
37 | * a DMA address for the message, and sends it to the server as the | |
38 | * payload of a CRQ message. The server DMAs the SRP IU and processes it, | |
39 | * including doing any additional data transfers. When it is done, it | |
40 | * DMAs the SRP response back to the same address as the request came from, | |
41 | * and sends a CRQ message back to inform the client that the request has | |
42 | * completed. | |
43 | * | |
7834799a | 44 | * TODO: This is currently pretty tied to the IBM pSeries hypervisor |
1da177e4 LT |
45 | * interfaces. It would be really nice to abstract this above an RDMA |
46 | * layer. | |
47 | */ | |
48 | ||
49 | #include <linux/module.h> | |
50 | #include <linux/moduleparam.h> | |
51 | #include <linux/dma-mapping.h> | |
52 | #include <linux/delay.h> | |
5a0e3ad6 | 53 | #include <linux/slab.h> |
126c5cc3 | 54 | #include <linux/of.h> |
64355b92 | 55 | #include <linux/pm.h> |
0f33ece5 | 56 | #include <linux/kthread.h> |
d3849d51 | 57 | #include <asm/firmware.h> |
1da177e4 LT |
58 | #include <asm/vio.h> |
59 | #include <scsi/scsi.h> | |
60 | #include <scsi/scsi_cmnd.h> | |
61 | #include <scsi/scsi_host.h> | |
62 | #include <scsi/scsi_device.h> | |
4d680419 | 63 | #include <scsi/scsi_transport_srp.h> |
1da177e4 LT |
64 | #include "ibmvscsi.h" |
65 | ||
66 | /* The values below are somewhat arbitrary default values, but | |
67 | * OS/400 will use 3 busses (disks, CDs, tapes, I think.) | |
68 | * Note that there are 3 bits of channel value, 6 bits of id, and | |
69 | * 5 bits of LUN. | |
70 | */ | |
71 | static int max_id = 64; | |
72 | static int max_channel = 3; | |
e1a5ce5b RJ |
73 | static int init_timeout = 300; |
74 | static int login_timeout = 60; | |
75 | static int info_timeout = 30; | |
76 | static int abort_timeout = 60; | |
77 | static int reset_timeout = 60; | |
a897ff2a | 78 | static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT; |
4f10aae0 | 79 | static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2; |
c1988e31 | 80 | static int fast_fail = 1; |
126c5cc3 | 81 | static int client_reserve = 1; |
1262dc09 | 82 | static char partition_name[96] = "UNKNOWN"; |
9965c2f1 | 83 | static unsigned int partition_number = -1; |
32d6e4b6 | 84 | static LIST_HEAD(ibmvscsi_head); |
7205981e | 85 | static DEFINE_SPINLOCK(ibmvscsi_driver_lock); |
1da177e4 | 86 | |
4d680419 FT |
87 | static struct scsi_transport_template *ibmvscsi_transport_template; |
88 | ||
aac3118d | 89 | #define IBMVSCSI_VERSION "1.5.9" |
1da177e4 LT |
90 | |
91 | MODULE_DESCRIPTION("IBM Virtual SCSI"); | |
92 | MODULE_AUTHOR("Dave Boutcher"); | |
93 | MODULE_LICENSE("GPL"); | |
94 | MODULE_VERSION(IBMVSCSI_VERSION); | |
95 | ||
96 | module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR); | |
e3678a0c | 97 | MODULE_PARM_DESC(max_id, "Largest ID value for each channel [Default=64]"); |
1da177e4 | 98 | module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR); |
e3678a0c | 99 | MODULE_PARM_DESC(max_channel, "Largest channel value [Default=3]"); |
1da177e4 LT |
100 | module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR); |
101 | MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds"); | |
21465eda | 102 | module_param_named(max_requests, max_requests, int, S_IRUGO); |
1da177e4 | 103 | MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter"); |
c1988e31 RJ |
104 | module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR); |
105 | MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]"); | |
126c5cc3 BK |
106 | module_param_named(client_reserve, client_reserve, int, S_IRUGO ); |
107 | MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release"); | |
1da177e4 | 108 | |
9965c2f1 BH |
109 | static void ibmvscsi_handle_crq(struct viosrp_crq *crq, |
110 | struct ibmvscsi_host_data *hostdata); | |
111 | ||
112 | /* ------------------------------------------------------------ | |
113 | * Routines for managing the command/response queue | |
114 | */ | |
115 | /** | |
116 | * ibmvscsi_handle_event: - Interrupt handler for crq events | |
117 | * @irq: number of irq to handle, not used | |
118 | * @dev_instance: ibmvscsi_host_data of host that received interrupt | |
119 | * | |
120 | * Disables interrupts and schedules srp_task | |
121 | * Always returns IRQ_HANDLED | |
122 | */ | |
123 | static irqreturn_t ibmvscsi_handle_event(int irq, void *dev_instance) | |
124 | { | |
125 | struct ibmvscsi_host_data *hostdata = | |
126 | (struct ibmvscsi_host_data *)dev_instance; | |
127 | vio_disable_interrupts(to_vio_dev(hostdata->dev)); | |
128 | tasklet_schedule(&hostdata->srp_task); | |
129 | return IRQ_HANDLED; | |
130 | } | |
131 | ||
132 | /** | |
841d7df0 LJ |
133 | * ibmvscsi_release_crq_queue() - Deallocates data and unregisters CRQ |
134 | * @queue: crq_queue to initialize and register | |
135 | * @hostdata: ibmvscsi_host_data of host | |
136 | * @max_requests: maximum requests (unused) | |
9965c2f1 BH |
137 | * |
138 | * Frees irq, deallocates a page for messages, unmaps dma, and unregisters | |
139 | * the crq with the hypervisor. | |
140 | */ | |
141 | static void ibmvscsi_release_crq_queue(struct crq_queue *queue, | |
142 | struct ibmvscsi_host_data *hostdata, | |
143 | int max_requests) | |
144 | { | |
145 | long rc = 0; | |
146 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
147 | free_irq(vdev->irq, (void *)hostdata); | |
148 | tasklet_kill(&hostdata->srp_task); | |
149 | do { | |
150 | if (rc) | |
151 | msleep(100); | |
152 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); | |
153 | } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); | |
154 | dma_unmap_single(hostdata->dev, | |
155 | queue->msg_token, | |
156 | queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL); | |
157 | free_page((unsigned long)queue->msgs); | |
158 | } | |
159 | ||
160 | /** | |
161 | * crq_queue_next_crq: - Returns the next entry in message queue | |
162 | * @queue: crq_queue to use | |
163 | * | |
164 | * Returns pointer to next entry in queue, or NULL if there are no new | |
165 | * entried in the CRQ. | |
166 | */ | |
167 | static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue) | |
168 | { | |
169 | struct viosrp_crq *crq; | |
170 | unsigned long flags; | |
171 | ||
172 | spin_lock_irqsave(&queue->lock, flags); | |
173 | crq = &queue->msgs[queue->cur]; | |
55c9b1e5 | 174 | if (crq->valid != VIOSRP_CRQ_FREE) { |
9965c2f1 BH |
175 | if (++queue->cur == queue->size) |
176 | queue->cur = 0; | |
7114aae0 BK |
177 | |
178 | /* Ensure the read of the valid bit occurs before reading any | |
179 | * other bits of the CRQ entry | |
180 | */ | |
181 | rmb(); | |
9965c2f1 BH |
182 | } else |
183 | crq = NULL; | |
184 | spin_unlock_irqrestore(&queue->lock, flags); | |
185 | ||
186 | return crq; | |
187 | } | |
188 | ||
189 | /** | |
190 | * ibmvscsi_send_crq: - Send a CRQ | |
191 | * @hostdata: the adapter | |
192 | * @word1: the first 64 bits of the data | |
193 | * @word2: the second 64 bits of the data | |
194 | */ | |
195 | static int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata, | |
196 | u64 word1, u64 word2) | |
197 | { | |
198 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
199 | ||
7114aae0 BK |
200 | /* |
201 | * Ensure the command buffer is flushed to memory before handing it | |
202 | * over to the VIOS to prevent it from fetching any stale data. | |
203 | */ | |
204 | mb(); | |
9965c2f1 BH |
205 | return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2); |
206 | } | |
207 | ||
208 | /** | |
209 | * ibmvscsi_task: - Process srps asynchronously | |
210 | * @data: ibmvscsi_host_data of host | |
211 | */ | |
212 | static void ibmvscsi_task(void *data) | |
213 | { | |
214 | struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data; | |
215 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
216 | struct viosrp_crq *crq; | |
217 | int done = 0; | |
218 | ||
219 | while (!done) { | |
220 | /* Pull all the valid messages off the CRQ */ | |
221 | while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) { | |
222 | ibmvscsi_handle_crq(crq, hostdata); | |
55c9b1e5 | 223 | crq->valid = VIOSRP_CRQ_FREE; |
b39205d2 | 224 | wmb(); |
9965c2f1 BH |
225 | } |
226 | ||
227 | vio_enable_interrupts(vdev); | |
228 | crq = crq_queue_next_crq(&hostdata->queue); | |
229 | if (crq != NULL) { | |
230 | vio_disable_interrupts(vdev); | |
231 | ibmvscsi_handle_crq(crq, hostdata); | |
55c9b1e5 | 232 | crq->valid = VIOSRP_CRQ_FREE; |
b39205d2 | 233 | wmb(); |
9965c2f1 BH |
234 | } else { |
235 | done = 1; | |
236 | } | |
237 | } | |
238 | } | |
239 | ||
240 | static void gather_partition_info(void) | |
241 | { | |
9965c2f1 | 242 | const char *ppartition_name; |
72264eb6 | 243 | const __be32 *p_number_ptr; |
9965c2f1 BH |
244 | |
245 | /* Retrieve information about this partition */ | |
5114d6a7 | 246 | if (!of_root) |
9965c2f1 | 247 | return; |
9965c2f1 | 248 | |
5114d6a7 TD |
249 | of_node_get(of_root); |
250 | ||
251 | ppartition_name = of_get_property(of_root, "ibm,partition-name", NULL); | |
9965c2f1 | 252 | if (ppartition_name) |
1262dc09 | 253 | strlcpy(partition_name, ppartition_name, |
9965c2f1 | 254 | sizeof(partition_name)); |
5114d6a7 | 255 | p_number_ptr = of_get_property(of_root, "ibm,partition-no", NULL); |
9965c2f1 | 256 | if (p_number_ptr) |
72264eb6 | 257 | partition_number = of_read_number(p_number_ptr, 1); |
5114d6a7 | 258 | of_node_put(of_root); |
9965c2f1 BH |
259 | } |
260 | ||
261 | static void set_adapter_info(struct ibmvscsi_host_data *hostdata) | |
262 | { | |
263 | memset(&hostdata->madapter_info, 0x00, | |
264 | sizeof(hostdata->madapter_info)); | |
265 | ||
266 | dev_info(hostdata->dev, "SRP_VERSION: %s\n", SRP_VERSION); | |
267 | strcpy(hostdata->madapter_info.srp_version, SRP_VERSION); | |
268 | ||
269 | strncpy(hostdata->madapter_info.partition_name, partition_name, | |
270 | sizeof(hostdata->madapter_info.partition_name)); | |
271 | ||
72264eb6 AB |
272 | hostdata->madapter_info.partition_number = |
273 | cpu_to_be32(partition_number); | |
9965c2f1 | 274 | |
45d8c30f TD |
275 | hostdata->madapter_info.mad_version = cpu_to_be32(SRP_MAD_VERSION_1); |
276 | hostdata->madapter_info.os_type = cpu_to_be32(SRP_MAD_OS_LINUX); | |
9965c2f1 BH |
277 | } |
278 | ||
279 | /** | |
841d7df0 | 280 | * ibmvscsi_reset_crq_queue() - resets a crq after a failure |
9965c2f1 BH |
281 | * @queue: crq_queue to initialize and register |
282 | * @hostdata: ibmvscsi_host_data of host | |
9965c2f1 BH |
283 | */ |
284 | static int ibmvscsi_reset_crq_queue(struct crq_queue *queue, | |
285 | struct ibmvscsi_host_data *hostdata) | |
286 | { | |
287 | int rc = 0; | |
288 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
289 | ||
290 | /* Close the CRQ */ | |
291 | do { | |
292 | if (rc) | |
293 | msleep(100); | |
294 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); | |
295 | } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); | |
296 | ||
297 | /* Clean out the queue */ | |
298 | memset(queue->msgs, 0x00, PAGE_SIZE); | |
299 | queue->cur = 0; | |
300 | ||
301 | set_adapter_info(hostdata); | |
302 | ||
303 | /* And re-open it again */ | |
304 | rc = plpar_hcall_norets(H_REG_CRQ, | |
305 | vdev->unit_address, | |
306 | queue->msg_token, PAGE_SIZE); | |
06cdbeff | 307 | if (rc == H_CLOSED) { |
9965c2f1 BH |
308 | /* Adapter is good, but other end is not ready */ |
309 | dev_warn(hostdata->dev, "Partner adapter not ready\n"); | |
310 | } else if (rc != 0) { | |
311 | dev_warn(hostdata->dev, "couldn't register crq--rc 0x%x\n", rc); | |
312 | } | |
313 | return rc; | |
314 | } | |
315 | ||
316 | /** | |
841d7df0 LJ |
317 | * ibmvscsi_init_crq_queue() - Initializes and registers CRQ with hypervisor |
318 | * @queue: crq_queue to initialize and register | |
319 | * @hostdata: ibmvscsi_host_data of host | |
320 | * @max_requests: maximum requests (unused) | |
9965c2f1 BH |
321 | * |
322 | * Allocates a page for messages, maps it for dma, and registers | |
323 | * the crq with the hypervisor. | |
324 | * Returns zero on success. | |
325 | */ | |
326 | static int ibmvscsi_init_crq_queue(struct crq_queue *queue, | |
327 | struct ibmvscsi_host_data *hostdata, | |
328 | int max_requests) | |
329 | { | |
330 | int rc; | |
331 | int retrc; | |
332 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
333 | ||
334 | queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL); | |
335 | ||
336 | if (!queue->msgs) | |
337 | goto malloc_failed; | |
338 | queue->size = PAGE_SIZE / sizeof(*queue->msgs); | |
339 | ||
340 | queue->msg_token = dma_map_single(hostdata->dev, queue->msgs, | |
341 | queue->size * sizeof(*queue->msgs), | |
342 | DMA_BIDIRECTIONAL); | |
343 | ||
344 | if (dma_mapping_error(hostdata->dev, queue->msg_token)) | |
345 | goto map_failed; | |
346 | ||
347 | gather_partition_info(); | |
348 | set_adapter_info(hostdata); | |
349 | ||
350 | retrc = rc = plpar_hcall_norets(H_REG_CRQ, | |
351 | vdev->unit_address, | |
352 | queue->msg_token, PAGE_SIZE); | |
353 | if (rc == H_RESOURCE) | |
354 | /* maybe kexecing and resource is busy. try a reset */ | |
355 | rc = ibmvscsi_reset_crq_queue(queue, | |
356 | hostdata); | |
357 | ||
06cdbeff | 358 | if (rc == H_CLOSED) { |
9965c2f1 BH |
359 | /* Adapter is good, but other end is not ready */ |
360 | dev_warn(hostdata->dev, "Partner adapter not ready\n"); | |
361 | retrc = 0; | |
362 | } else if (rc != 0) { | |
363 | dev_warn(hostdata->dev, "Error %d opening adapter\n", rc); | |
364 | goto reg_crq_failed; | |
365 | } | |
366 | ||
367 | queue->cur = 0; | |
368 | spin_lock_init(&queue->lock); | |
369 | ||
370 | tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task, | |
371 | (unsigned long)hostdata); | |
372 | ||
373 | if (request_irq(vdev->irq, | |
374 | ibmvscsi_handle_event, | |
375 | 0, "ibmvscsi", (void *)hostdata) != 0) { | |
376 | dev_err(hostdata->dev, "couldn't register irq 0x%x\n", | |
377 | vdev->irq); | |
378 | goto req_irq_failed; | |
379 | } | |
380 | ||
381 | rc = vio_enable_interrupts(vdev); | |
382 | if (rc != 0) { | |
383 | dev_err(hostdata->dev, "Error %d enabling interrupts!!!\n", rc); | |
384 | goto req_irq_failed; | |
385 | } | |
386 | ||
387 | return retrc; | |
388 | ||
389 | req_irq_failed: | |
390 | tasklet_kill(&hostdata->srp_task); | |
391 | rc = 0; | |
392 | do { | |
393 | if (rc) | |
394 | msleep(100); | |
395 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); | |
396 | } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); | |
397 | reg_crq_failed: | |
398 | dma_unmap_single(hostdata->dev, | |
399 | queue->msg_token, | |
400 | queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL); | |
401 | map_failed: | |
402 | free_page((unsigned long)queue->msgs); | |
403 | malloc_failed: | |
404 | return -1; | |
405 | } | |
406 | ||
407 | /** | |
841d7df0 | 408 | * ibmvscsi_reenable_crq_queue() - reenables a crq after |
9965c2f1 BH |
409 | * @queue: crq_queue to initialize and register |
410 | * @hostdata: ibmvscsi_host_data of host | |
9965c2f1 BH |
411 | */ |
412 | static int ibmvscsi_reenable_crq_queue(struct crq_queue *queue, | |
413 | struct ibmvscsi_host_data *hostdata) | |
414 | { | |
415 | int rc = 0; | |
416 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
417 | ||
4919b33b TD |
418 | set_adapter_info(hostdata); |
419 | ||
9965c2f1 BH |
420 | /* Re-enable the CRQ */ |
421 | do { | |
422 | if (rc) | |
423 | msleep(100); | |
424 | rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address); | |
425 | } while ((rc == H_IN_PROGRESS) || (rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); | |
426 | ||
427 | if (rc) | |
428 | dev_err(hostdata->dev, "Error %d enabling adapter\n", rc); | |
429 | return rc; | |
430 | } | |
431 | ||
1da177e4 LT |
432 | /* ------------------------------------------------------------ |
433 | * Routines for the event pool and event structs | |
434 | */ | |
435 | /** | |
436 | * initialize_event_pool: - Allocates and initializes the event pool for a host | |
437 | * @pool: event_pool to be initialized | |
438 | * @size: Number of events in pool | |
439 | * @hostdata: ibmvscsi_host_data who owns the event pool | |
440 | * | |
441 | * Returns zero on success. | |
841d7df0 | 442 | */ |
1da177e4 LT |
443 | static int initialize_event_pool(struct event_pool *pool, |
444 | int size, struct ibmvscsi_host_data *hostdata) | |
445 | { | |
446 | int i; | |
447 | ||
448 | pool->size = size; | |
449 | pool->next = 0; | |
4c021dd1 | 450 | pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL); |
1da177e4 LT |
451 | if (!pool->events) |
452 | return -ENOMEM; | |
1da177e4 LT |
453 | |
454 | pool->iu_storage = | |
455 | dma_alloc_coherent(hostdata->dev, | |
456 | pool->size * sizeof(*pool->iu_storage), | |
457 | &pool->iu_token, 0); | |
458 | if (!pool->iu_storage) { | |
459 | kfree(pool->events); | |
460 | return -ENOMEM; | |
461 | } | |
462 | ||
463 | for (i = 0; i < pool->size; ++i) { | |
464 | struct srp_event_struct *evt = &pool->events[i]; | |
465 | memset(&evt->crq, 0x00, sizeof(evt->crq)); | |
466 | atomic_set(&evt->free, 1); | |
55c9b1e5 | 467 | evt->crq.valid = VIOSRP_CRQ_CMD_RSP; |
72264eb6 AB |
468 | evt->crq.IU_length = cpu_to_be16(sizeof(*evt->xfer_iu)); |
469 | evt->crq.IU_data_ptr = cpu_to_be64(pool->iu_token + | |
470 | sizeof(*evt->xfer_iu) * i); | |
1da177e4 LT |
471 | evt->xfer_iu = pool->iu_storage + i; |
472 | evt->hostdata = hostdata; | |
4dddbc26 JB |
473 | evt->ext_list = NULL; |
474 | evt->ext_list_token = 0; | |
1da177e4 LT |
475 | } |
476 | ||
477 | return 0; | |
478 | } | |
479 | ||
480 | /** | |
841d7df0 | 481 | * release_event_pool() - Frees memory of an event pool of a host |
1da177e4 LT |
482 | * @pool: event_pool to be released |
483 | * @hostdata: ibmvscsi_host_data who owns the even pool | |
484 | * | |
485 | * Returns zero on success. | |
841d7df0 | 486 | */ |
1da177e4 LT |
487 | static void release_event_pool(struct event_pool *pool, |
488 | struct ibmvscsi_host_data *hostdata) | |
489 | { | |
490 | int i, in_use = 0; | |
4dddbc26 | 491 | for (i = 0; i < pool->size; ++i) { |
1da177e4 LT |
492 | if (atomic_read(&pool->events[i].free) != 1) |
493 | ++in_use; | |
4dddbc26 JB |
494 | if (pool->events[i].ext_list) { |
495 | dma_free_coherent(hostdata->dev, | |
ef265673 | 496 | SG_ALL * sizeof(struct srp_direct_buf), |
4dddbc26 JB |
497 | pool->events[i].ext_list, |
498 | pool->events[i].ext_list_token); | |
499 | } | |
500 | } | |
1da177e4 | 501 | if (in_use) |
6c0a60ec BK |
502 | dev_warn(hostdata->dev, "releasing event pool with %d " |
503 | "events still in use?\n", in_use); | |
1da177e4 LT |
504 | kfree(pool->events); |
505 | dma_free_coherent(hostdata->dev, | |
506 | pool->size * sizeof(*pool->iu_storage), | |
507 | pool->iu_storage, pool->iu_token); | |
508 | } | |
509 | ||
510 | /** | |
511 | * valid_event_struct: - Determines if event is valid. | |
512 | * @pool: event_pool that contains the event | |
513 | * @evt: srp_event_struct to be checked for validity | |
514 | * | |
515 | * Returns zero if event is invalid, one otherwise. | |
516 | */ | |
517 | static int valid_event_struct(struct event_pool *pool, | |
518 | struct srp_event_struct *evt) | |
519 | { | |
520 | int index = evt - pool->events; | |
521 | if (index < 0 || index >= pool->size) /* outside of bounds */ | |
522 | return 0; | |
523 | if (evt != pool->events + index) /* unaligned */ | |
524 | return 0; | |
525 | return 1; | |
526 | } | |
527 | ||
528 | /** | |
841d7df0 | 529 | * free_event_struct() - Changes status of event to "free" |
1da177e4 LT |
530 | * @pool: event_pool that contains the event |
531 | * @evt: srp_event_struct to be modified | |
841d7df0 | 532 | */ |
1da177e4 LT |
533 | static void free_event_struct(struct event_pool *pool, |
534 | struct srp_event_struct *evt) | |
535 | { | |
536 | if (!valid_event_struct(pool, evt)) { | |
6c0a60ec BK |
537 | dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p " |
538 | "(not in pool %p)\n", evt, pool->events); | |
1da177e4 LT |
539 | return; |
540 | } | |
541 | if (atomic_inc_return(&evt->free) != 1) { | |
6c0a60ec BK |
542 | dev_err(evt->hostdata->dev, "Freeing event_struct %p " |
543 | "which is not in use!\n", evt); | |
1da177e4 LT |
544 | return; |
545 | } | |
546 | } | |
547 | ||
548 | /** | |
841d7df0 | 549 | * get_event_struct() - Gets the next free event in pool |
1da177e4 LT |
550 | * @pool: event_pool that contains the events to be searched |
551 | * | |
552 | * Returns the next event in "free" state, and NULL if none are free. | |
553 | * Note that no synchronization is done here, we assume the host_lock | |
554 | * will syncrhonze things. | |
555 | */ | |
556 | static struct srp_event_struct *get_event_struct(struct event_pool *pool) | |
557 | { | |
558 | int i; | |
559 | int poolsize = pool->size; | |
560 | int offset = pool->next; | |
561 | ||
562 | for (i = 0; i < poolsize; i++) { | |
563 | offset = (offset + 1) % poolsize; | |
564 | if (!atomic_dec_if_positive(&pool->events[offset].free)) { | |
565 | pool->next = offset; | |
566 | return &pool->events[offset]; | |
567 | } | |
568 | } | |
569 | ||
570 | printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n"); | |
571 | return NULL; | |
572 | } | |
573 | ||
574 | /** | |
575 | * init_event_struct: Initialize fields in an event struct that are always | |
576 | * required. | |
841d7df0 | 577 | * @evt_struct: The event |
1da177e4 LT |
578 | * @done: Routine to call when the event is responded to |
579 | * @format: SRP or MAD format | |
580 | * @timeout: timeout value set in the CRQ | |
581 | */ | |
582 | static void init_event_struct(struct srp_event_struct *evt_struct, | |
583 | void (*done) (struct srp_event_struct *), | |
584 | u8 format, | |
585 | int timeout) | |
586 | { | |
587 | evt_struct->cmnd = NULL; | |
588 | evt_struct->cmnd_done = NULL; | |
589 | evt_struct->sync_srp = NULL; | |
590 | evt_struct->crq.format = format; | |
72264eb6 | 591 | evt_struct->crq.timeout = cpu_to_be16(timeout); |
1da177e4 LT |
592 | evt_struct->done = done; |
593 | } | |
594 | ||
595 | /* ------------------------------------------------------------ | |
596 | * Routines for receiving SCSI responses from the hosting partition | |
597 | */ | |
598 | ||
841d7df0 | 599 | /* |
1da177e4 LT |
600 | * set_srp_direction: Set the fields in the srp related to data |
601 | * direction and number of buffers based on the direction in | |
602 | * the scsi_cmnd and the number of buffers | |
603 | */ | |
604 | static void set_srp_direction(struct scsi_cmnd *cmd, | |
605 | struct srp_cmd *srp_cmd, | |
606 | int numbuf) | |
607 | { | |
ef265673 FT |
608 | u8 fmt; |
609 | ||
1da177e4 LT |
610 | if (numbuf == 0) |
611 | return; | |
612 | ||
ef265673 FT |
613 | if (numbuf == 1) |
614 | fmt = SRP_DATA_DESC_DIRECT; | |
615 | else { | |
616 | fmt = SRP_DATA_DESC_INDIRECT; | |
617 | numbuf = min(numbuf, MAX_INDIRECT_BUFS); | |
618 | ||
1da177e4 | 619 | if (cmd->sc_data_direction == DMA_TO_DEVICE) |
ef265673 FT |
620 | srp_cmd->data_out_desc_cnt = numbuf; |
621 | else | |
622 | srp_cmd->data_in_desc_cnt = numbuf; | |
1da177e4 | 623 | } |
ef265673 FT |
624 | |
625 | if (cmd->sc_data_direction == DMA_TO_DEVICE) | |
626 | srp_cmd->buf_fmt = fmt << 4; | |
627 | else | |
628 | srp_cmd->buf_fmt = fmt; | |
1da177e4 LT |
629 | } |
630 | ||
631 | /** | |
632 | * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format | |
633 | * @cmd: srp_cmd whose additional_data member will be unmapped | |
841d7df0 | 634 | * @evt_struct: the event |
1da177e4 | 635 | * @dev: device for which the memory is mapped |
841d7df0 | 636 | */ |
4dddbc26 JB |
637 | static void unmap_cmd_data(struct srp_cmd *cmd, |
638 | struct srp_event_struct *evt_struct, | |
639 | struct device *dev) | |
1da177e4 | 640 | { |
ef265673 FT |
641 | u8 out_fmt, in_fmt; |
642 | ||
643 | out_fmt = cmd->buf_fmt >> 4; | |
644 | in_fmt = cmd->buf_fmt & ((1U << 4) - 1); | |
645 | ||
646 | if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC) | |
1da177e4 | 647 | return; |
4dddbc26 | 648 | |
a71fa1fc FT |
649 | if (evt_struct->cmnd) |
650 | scsi_dma_unmap(evt_struct->cmnd); | |
1da177e4 LT |
651 | } |
652 | ||
9413d7b8 | 653 | static int map_sg_list(struct scsi_cmnd *cmd, int nseg, |
ef265673 | 654 | struct srp_direct_buf *md) |
4dddbc26 JB |
655 | { |
656 | int i; | |
9413d7b8 | 657 | struct scatterlist *sg; |
4dddbc26 JB |
658 | u64 total_length = 0; |
659 | ||
9413d7b8 | 660 | scsi_for_each_sg(cmd, sg, nseg, i) { |
ef265673 | 661 | struct srp_direct_buf *descr = md + i; |
72264eb6 AB |
662 | descr->va = cpu_to_be64(sg_dma_address(sg)); |
663 | descr->len = cpu_to_be32(sg_dma_len(sg)); | |
ef265673 | 664 | descr->key = 0; |
9413d7b8 | 665 | total_length += sg_dma_len(sg); |
4dddbc26 JB |
666 | } |
667 | return total_length; | |
668 | } | |
669 | ||
1da177e4 | 670 | /** |
0a19a725 | 671 | * map_sg_data: - Maps dma for a scatterlist and initializes descriptor fields |
91ebc1fa | 672 | * @cmd: struct scsi_cmnd with the scatterlist |
841d7df0 | 673 | * @evt_struct: struct srp_event_struct to map |
1da177e4 LT |
674 | * @srp_cmd: srp_cmd that contains the memory descriptor |
675 | * @dev: device for which to map dma memory | |
676 | * | |
677 | * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd. | |
678 | * Returns 1 on success. | |
679 | */ | |
680 | static int map_sg_data(struct scsi_cmnd *cmd, | |
4dddbc26 | 681 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
682 | struct srp_cmd *srp_cmd, struct device *dev) |
683 | { | |
684 | ||
4dddbc26 | 685 | int sg_mapped; |
1da177e4 | 686 | u64 total_length = 0; |
ef265673 FT |
687 | struct srp_direct_buf *data = |
688 | (struct srp_direct_buf *) srp_cmd->add_data; | |
689 | struct srp_indirect_buf *indirect = | |
690 | (struct srp_indirect_buf *) data; | |
1da177e4 | 691 | |
9413d7b8 FT |
692 | sg_mapped = scsi_dma_map(cmd); |
693 | if (!sg_mapped) | |
694 | return 1; | |
695 | else if (sg_mapped < 0) | |
1da177e4 LT |
696 | return 0; |
697 | ||
698 | set_srp_direction(cmd, srp_cmd, sg_mapped); | |
699 | ||
700 | /* special case; we can use a single direct descriptor */ | |
701 | if (sg_mapped == 1) { | |
9413d7b8 | 702 | map_sg_list(cmd, sg_mapped, data); |
1da177e4 LT |
703 | return 1; |
704 | } | |
705 | ||
ef265673 | 706 | indirect->table_desc.va = 0; |
72264eb6 AB |
707 | indirect->table_desc.len = cpu_to_be32(sg_mapped * |
708 | sizeof(struct srp_direct_buf)); | |
ef265673 | 709 | indirect->table_desc.key = 0; |
4dddbc26 JB |
710 | |
711 | if (sg_mapped <= MAX_INDIRECT_BUFS) { | |
9413d7b8 | 712 | total_length = map_sg_list(cmd, sg_mapped, |
ef265673 | 713 | &indirect->desc_list[0]); |
72264eb6 | 714 | indirect->len = cpu_to_be32(total_length); |
4dddbc26 | 715 | return 1; |
1da177e4 | 716 | } |
1da177e4 | 717 | |
4dddbc26 JB |
718 | /* get indirect table */ |
719 | if (!evt_struct->ext_list) { | |
0d556a21 | 720 | evt_struct->ext_list = dma_alloc_coherent(dev, |
ef265673 FT |
721 | SG_ALL * sizeof(struct srp_direct_buf), |
722 | &evt_struct->ext_list_token, 0); | |
4dddbc26 | 723 | if (!evt_struct->ext_list) { |
7912a0ac RJ |
724 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
725 | sdev_printk(KERN_ERR, cmd->device, | |
726 | "Can't allocate memory " | |
727 | "for indirect table\n"); | |
e637d553 | 728 | scsi_dma_unmap(cmd); |
4dddbc26 | 729 | return 0; |
4dddbc26 JB |
730 | } |
731 | } | |
732 | ||
9413d7b8 | 733 | total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list); |
4dddbc26 | 734 | |
72264eb6 AB |
735 | indirect->len = cpu_to_be32(total_length); |
736 | indirect->table_desc.va = cpu_to_be64(evt_struct->ext_list_token); | |
737 | indirect->table_desc.len = cpu_to_be32(sg_mapped * | |
738 | sizeof(indirect->desc_list[0])); | |
ef265673 FT |
739 | memcpy(indirect->desc_list, evt_struct->ext_list, |
740 | MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf)); | |
4dddbc26 | 741 | return 1; |
1da177e4 LT |
742 | } |
743 | ||
1da177e4 LT |
744 | /** |
745 | * map_data_for_srp_cmd: - Calls functions to map data for srp cmds | |
746 | * @cmd: struct scsi_cmnd with the memory to be mapped | |
841d7df0 | 747 | * @evt_struct: struct srp_event_struct to map |
1da177e4 LT |
748 | * @srp_cmd: srp_cmd that contains the memory descriptor |
749 | * @dev: dma device for which to map dma memory | |
750 | * | |
751 | * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds | |
752 | * Returns 1 on success. | |
753 | */ | |
754 | static int map_data_for_srp_cmd(struct scsi_cmnd *cmd, | |
4dddbc26 | 755 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
756 | struct srp_cmd *srp_cmd, struct device *dev) |
757 | { | |
758 | switch (cmd->sc_data_direction) { | |
759 | case DMA_FROM_DEVICE: | |
760 | case DMA_TO_DEVICE: | |
761 | break; | |
762 | case DMA_NONE: | |
763 | return 1; | |
764 | case DMA_BIDIRECTIONAL: | |
6c0a60ec BK |
765 | sdev_printk(KERN_ERR, cmd->device, |
766 | "Can't map DMA_BIDIRECTIONAL to read/write\n"); | |
1da177e4 LT |
767 | return 0; |
768 | default: | |
6c0a60ec BK |
769 | sdev_printk(KERN_ERR, cmd->device, |
770 | "Unknown data direction 0x%02x; can't map!\n", | |
771 | cmd->sc_data_direction); | |
1da177e4 LT |
772 | return 0; |
773 | } | |
774 | ||
9413d7b8 | 775 | return map_sg_data(cmd, evt_struct, srp_cmd, dev); |
1da177e4 LT |
776 | } |
777 | ||
3d0e91f7 BK |
778 | /** |
779 | * purge_requests: Our virtual adapter just shut down. purge any sent requests | |
780 | * @hostdata: the adapter | |
841d7df0 | 781 | * @error_code: error code to return as the 'result' |
3d0e91f7 BK |
782 | */ |
783 | static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code) | |
784 | { | |
1117ef8a | 785 | struct srp_event_struct *evt; |
3d0e91f7 BK |
786 | unsigned long flags; |
787 | ||
788 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1117ef8a BK |
789 | while (!list_empty(&hostdata->sent)) { |
790 | evt = list_first_entry(&hostdata->sent, struct srp_event_struct, list); | |
791 | list_del(&evt->list); | |
792 | del_timer(&evt->timer); | |
793 | ||
794 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
795 | if (evt->cmnd) { | |
796 | evt->cmnd->result = (error_code << 16); | |
797 | unmap_cmd_data(&evt->iu.srp.cmd, evt, | |
798 | evt->hostdata->dev); | |
799 | if (evt->cmnd_done) | |
800 | evt->cmnd_done(evt->cmnd); | |
9ee75597 BK |
801 | } else if (evt->done && evt->crq.format != VIOSRP_MAD_FORMAT && |
802 | evt->iu.srp.login_req.opcode != SRP_LOGIN_REQ) | |
1117ef8a BK |
803 | evt->done(evt); |
804 | free_event_struct(&evt->hostdata->pool, evt); | |
805 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
3d0e91f7 BK |
806 | } |
807 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
808 | } | |
809 | ||
665e0224 TD |
810 | /** |
811 | * ibmvscsi_set_request_limit - Set the adapter request_limit in response to | |
812 | * an adapter failure, reset, or SRP Login. Done under host lock to prevent | |
813 | * race with SCSI command submission. | |
814 | * @hostdata: adapter to adjust | |
815 | * @limit: new request limit | |
816 | */ | |
817 | static void ibmvscsi_set_request_limit(struct ibmvscsi_host_data *hostdata, int limit) | |
818 | { | |
819 | unsigned long flags; | |
820 | ||
821 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
822 | atomic_set(&hostdata->request_limit, limit); | |
823 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
824 | } | |
825 | ||
3d0e91f7 BK |
826 | /** |
827 | * ibmvscsi_reset_host - Reset the connection to the server | |
828 | * @hostdata: struct ibmvscsi_host_data to reset | |
829 | */ | |
830 | static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata) | |
831 | { | |
832 | scsi_block_requests(hostdata->host); | |
665e0224 | 833 | ibmvscsi_set_request_limit(hostdata, 0); |
3d0e91f7 BK |
834 | |
835 | purge_requests(hostdata, DID_ERROR); | |
6e40de8b | 836 | hostdata->action = IBMVSCSI_HOST_ACTION_RESET; |
0f33ece5 | 837 | wake_up(&hostdata->work_wait_q); |
3d0e91f7 BK |
838 | } |
839 | ||
840 | /** | |
841 | * ibmvscsi_timeout - Internal command timeout handler | |
841d7df0 | 842 | * @t: struct srp_event_struct that timed out |
3d0e91f7 BK |
843 | * |
844 | * Called when an internally generated command times out | |
845 | */ | |
9a5d04fc | 846 | static void ibmvscsi_timeout(struct timer_list *t) |
3d0e91f7 | 847 | { |
9a5d04fc | 848 | struct srp_event_struct *evt_struct = from_timer(evt_struct, t, timer); |
3d0e91f7 BK |
849 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; |
850 | ||
851 | dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n", | |
852 | evt_struct->iu.srp.cmd.opcode); | |
853 | ||
854 | ibmvscsi_reset_host(hostdata); | |
855 | } | |
856 | ||
857 | ||
1da177e4 LT |
858 | /* ------------------------------------------------------------ |
859 | * Routines for sending and receiving SRPs | |
860 | */ | |
861 | /** | |
862 | * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq() | |
863 | * @evt_struct: evt_struct to be sent | |
864 | * @hostdata: ibmvscsi_host_data of host | |
3d0e91f7 | 865 | * @timeout: timeout in seconds - 0 means do not time command |
1da177e4 LT |
866 | * |
867 | * Returns the value returned from ibmvscsi_send_crq(). (Zero for success) | |
868 | * Note that this routine assumes that host_lock is held for synchronization | |
869 | */ | |
870 | static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct, | |
3d0e91f7 BK |
871 | struct ibmvscsi_host_data *hostdata, |
872 | unsigned long timeout) | |
1da177e4 | 873 | { |
72264eb6 | 874 | __be64 *crq_as_u64 = (__be64 *)&evt_struct->crq; |
3c887e8a | 875 | int request_status = 0; |
1da177e4 | 876 | int rc; |
f3a9c4d7 | 877 | int srp_req = 0; |
1da177e4 | 878 | |
a897ff2a RJ |
879 | /* If we have exhausted our request limit, just fail this request, |
880 | * unless it is for a reset or abort. | |
1da177e4 LT |
881 | * Note that there are rare cases involving driver generated requests |
882 | * (such as task management requests) that the mid layer may think we | |
883 | * can handle more requests (can_queue) when we actually can't | |
884 | */ | |
cefbda2d | 885 | if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) { |
f3a9c4d7 | 886 | srp_req = 1; |
cefbda2d DB |
887 | request_status = |
888 | atomic_dec_if_positive(&hostdata->request_limit); | |
889 | /* If request limit was -1 when we started, it is now even | |
890 | * less than that | |
891 | */ | |
892 | if (request_status < -1) | |
893 | goto send_error; | |
a897ff2a | 894 | /* Otherwise, we may have run out of requests. */ |
3c887e8a RJ |
895 | /* If request limit was 0 when we started the adapter is in the |
896 | * process of performing a login with the server adapter, or | |
897 | * we may have run out of requests. | |
898 | */ | |
899 | else if (request_status == -1 && | |
900 | evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ) | |
901 | goto send_busy; | |
a897ff2a RJ |
902 | /* Abort and reset calls should make it through. |
903 | * Nothing except abort and reset should use the last two | |
904 | * slots unless we had two or less to begin with. | |
905 | */ | |
906 | else if (request_status < 2 && | |
907 | evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) { | |
908 | /* In the case that we have less than two requests | |
909 | * available, check the server limit as a combination | |
910 | * of the request limit and the number of requests | |
911 | * in-flight (the size of the send list). If the | |
912 | * server limit is greater than 2, return busy so | |
913 | * that the last two are reserved for reset and abort. | |
914 | */ | |
915 | int server_limit = request_status; | |
916 | struct srp_event_struct *tmp_evt; | |
917 | ||
918 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
919 | server_limit++; | |
920 | } | |
921 | ||
922 | if (server_limit > 2) | |
923 | goto send_busy; | |
924 | } | |
cefbda2d | 925 | } |
1da177e4 LT |
926 | |
927 | /* Copy the IU into the transfer area */ | |
928 | *evt_struct->xfer_iu = evt_struct->iu; | |
ef265673 | 929 | evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct; |
1da177e4 LT |
930 | |
931 | /* Add this to the sent list. We need to do this | |
932 | * before we actually send | |
933 | * in case it comes back REALLY fast | |
934 | */ | |
935 | list_add_tail(&evt_struct->list, &hostdata->sent); | |
936 | ||
9a5d04fc | 937 | timer_setup(&evt_struct->timer, ibmvscsi_timeout, 0); |
3d0e91f7 | 938 | if (timeout) { |
3d0e91f7 | 939 | evt_struct->timer.expires = jiffies + (timeout * HZ); |
3d0e91f7 BK |
940 | add_timer(&evt_struct->timer); |
941 | } | |
942 | ||
72264eb6 AB |
943 | rc = ibmvscsi_send_crq(hostdata, be64_to_cpu(crq_as_u64[0]), |
944 | be64_to_cpu(crq_as_u64[1])); | |
945 | if (rc != 0) { | |
1da177e4 | 946 | list_del(&evt_struct->list); |
3d0e91f7 | 947 | del_timer(&evt_struct->timer); |
1da177e4 | 948 | |
860784c8 RJ |
949 | /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY. |
950 | * Firmware will send a CRQ with a transport event (0xFF) to | |
951 | * tell this client what has happened to the transport. This | |
952 | * will be handled in ibmvscsi_handle_crq() | |
953 | */ | |
954 | if (rc == H_CLOSED) { | |
955 | dev_warn(hostdata->dev, "send warning. " | |
956 | "Receive queue closed, will retry.\n"); | |
957 | goto send_busy; | |
958 | } | |
6c0a60ec | 959 | dev_err(hostdata->dev, "send error %d\n", rc); |
f3a9c4d7 BK |
960 | if (srp_req) |
961 | atomic_inc(&hostdata->request_limit); | |
1da177e4 LT |
962 | goto send_error; |
963 | } | |
964 | ||
965 | return 0; | |
966 | ||
cefbda2d | 967 | send_busy: |
4dddbc26 | 968 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); |
1da177e4 | 969 | |
1da177e4 | 970 | free_event_struct(&hostdata->pool, evt_struct); |
f3a9c4d7 | 971 | if (srp_req && request_status != -1) |
3c887e8a | 972 | atomic_inc(&hostdata->request_limit); |
a897ff2a | 973 | return SCSI_MLQUEUE_HOST_BUSY; |
cefbda2d DB |
974 | |
975 | send_error: | |
976 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); | |
977 | ||
978 | if (evt_struct->cmnd != NULL) { | |
979 | evt_struct->cmnd->result = DID_ERROR << 16; | |
980 | evt_struct->cmnd_done(evt_struct->cmnd); | |
981 | } else if (evt_struct->done) | |
982 | evt_struct->done(evt_struct); | |
983 | ||
984 | free_event_struct(&hostdata->pool, evt_struct); | |
985 | return 0; | |
1da177e4 LT |
986 | } |
987 | ||
988 | /** | |
989 | * handle_cmd_rsp: - Handle responses from commands | |
990 | * @evt_struct: srp_event_struct to be handled | |
991 | * | |
992 | * Used as a callback by when sending scsi cmds. | |
993 | * Gets called by ibmvscsi_handle_crq() | |
994 | */ | |
995 | static void handle_cmd_rsp(struct srp_event_struct *evt_struct) | |
996 | { | |
997 | struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp; | |
998 | struct scsi_cmnd *cmnd = evt_struct->cmnd; | |
999 | ||
ef265673 | 1000 | if (unlikely(rsp->opcode != SRP_RSP)) { |
1da177e4 | 1001 | if (printk_ratelimit()) |
6c0a60ec | 1002 | dev_warn(evt_struct->hostdata->dev, |
15c92746 | 1003 | "bad SRP RSP type %#02x\n", rsp->opcode); |
1da177e4 LT |
1004 | } |
1005 | ||
1006 | if (cmnd) { | |
c3a3b55a | 1007 | cmnd->result |= rsp->status; |
d0672a03 | 1008 | if (scsi_status_is_check_condition(cmnd->result)) |
1da177e4 | 1009 | memcpy(cmnd->sense_buffer, |
ef265673 | 1010 | rsp->data, |
72264eb6 | 1011 | be32_to_cpu(rsp->sense_data_len)); |
1da177e4 | 1012 | unmap_cmd_data(&evt_struct->iu.srp.cmd, |
4dddbc26 | 1013 | evt_struct, |
1da177e4 LT |
1014 | evt_struct->hostdata->dev); |
1015 | ||
ef265673 | 1016 | if (rsp->flags & SRP_RSP_FLAG_DOOVER) |
72264eb6 AB |
1017 | scsi_set_resid(cmnd, |
1018 | be32_to_cpu(rsp->data_out_res_cnt)); | |
ef265673 | 1019 | else if (rsp->flags & SRP_RSP_FLAG_DIOVER) |
72264eb6 | 1020 | scsi_set_resid(cmnd, be32_to_cpu(rsp->data_in_res_cnt)); |
1da177e4 LT |
1021 | } |
1022 | ||
1023 | if (evt_struct->cmnd_done) | |
1024 | evt_struct->cmnd_done(cmnd); | |
1025 | } | |
1026 | ||
1027 | /** | |
1028 | * lun_from_dev: - Returns the lun of the scsi device | |
1029 | * @dev: struct scsi_device | |
1030 | * | |
1031 | */ | |
1032 | static inline u16 lun_from_dev(struct scsi_device *dev) | |
1033 | { | |
1034 | return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun; | |
1035 | } | |
1036 | ||
1037 | /** | |
841d7df0 LJ |
1038 | * ibmvscsi_queuecommand_lck() - The queuecommand function of the scsi template |
1039 | * @cmnd: struct scsi_cmnd to be executed | |
1da177e4 LT |
1040 | * @done: Callback function to be called when cmd is completed |
1041 | */ | |
af049dfd | 1042 | static int ibmvscsi_queuecommand_lck(struct scsi_cmnd *cmnd) |
1da177e4 | 1043 | { |
af049dfd | 1044 | void (*done)(struct scsi_cmnd *) = scsi_done; |
1da177e4 LT |
1045 | struct srp_cmd *srp_cmd; |
1046 | struct srp_event_struct *evt_struct; | |
ef265673 | 1047 | struct srp_indirect_buf *indirect; |
7603e02e | 1048 | struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host); |
1da177e4 | 1049 | u16 lun = lun_from_dev(cmnd->device); |
ef265673 | 1050 | u8 out_fmt, in_fmt; |
1da177e4 | 1051 | |
c3a3b55a | 1052 | cmnd->result = (DID_OK << 16); |
1da177e4 LT |
1053 | evt_struct = get_event_struct(&hostdata->pool); |
1054 | if (!evt_struct) | |
1055 | return SCSI_MLQUEUE_HOST_BUSY; | |
1056 | ||
1da177e4 LT |
1057 | /* Set up the actual SRP IU */ |
1058 | srp_cmd = &evt_struct->iu.srp.cmd; | |
ef265673 FT |
1059 | memset(srp_cmd, 0x00, SRP_MAX_IU_LEN); |
1060 | srp_cmd->opcode = SRP_CMD; | |
64a87b24 | 1061 | memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb)); |
985aa495 | 1062 | int_to_scsilun(lun, &srp_cmd->lun); |
1da177e4 | 1063 | |
4dddbc26 | 1064 | if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) { |
7912a0ac RJ |
1065 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
1066 | sdev_printk(KERN_ERR, cmnd->device, | |
1067 | "couldn't convert cmd to srp_cmd\n"); | |
1da177e4 LT |
1068 | free_event_struct(&hostdata->pool, evt_struct); |
1069 | return SCSI_MLQUEUE_HOST_BUSY; | |
1070 | } | |
1071 | ||
4dddbc26 JB |
1072 | init_event_struct(evt_struct, |
1073 | handle_cmd_rsp, | |
1074 | VIOSRP_SRP_FORMAT, | |
0cd75102 | 1075 | scsi_cmd_to_rq(cmnd)->timeout / HZ); |
4dddbc26 JB |
1076 | |
1077 | evt_struct->cmnd = cmnd; | |
1078 | evt_struct->cmnd_done = done; | |
1079 | ||
1da177e4 | 1080 | /* Fix up dma address of the buffer itself */ |
ef265673 FT |
1081 | indirect = (struct srp_indirect_buf *) srp_cmd->add_data; |
1082 | out_fmt = srp_cmd->buf_fmt >> 4; | |
1083 | in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1); | |
1084 | if ((in_fmt == SRP_DATA_DESC_INDIRECT || | |
1085 | out_fmt == SRP_DATA_DESC_INDIRECT) && | |
1086 | indirect->table_desc.va == 0) { | |
72264eb6 AB |
1087 | indirect->table_desc.va = |
1088 | cpu_to_be64(be64_to_cpu(evt_struct->crq.IU_data_ptr) + | |
ef265673 | 1089 | offsetof(struct srp_cmd, add_data) + |
72264eb6 | 1090 | offsetof(struct srp_indirect_buf, desc_list)); |
1da177e4 LT |
1091 | } |
1092 | ||
3d0e91f7 | 1093 | return ibmvscsi_send_srp_event(evt_struct, hostdata, 0); |
1da177e4 LT |
1094 | } |
1095 | ||
f281233d JG |
1096 | static DEF_SCSI_QCMD(ibmvscsi_queuecommand) |
1097 | ||
1da177e4 LT |
1098 | /* ------------------------------------------------------------ |
1099 | * Routines for driver initialization | |
1100 | */ | |
3507e13f | 1101 | |
126c5cc3 BK |
1102 | /** |
1103 | * map_persist_bufs: - Pre-map persistent data for adapter logins | |
1104 | * @hostdata: ibmvscsi_host_data of host | |
1105 | * | |
1106 | * Map the capabilities and adapter info DMA buffers to avoid runtime failures. | |
1107 | * Return 1 on error, 0 on success. | |
1108 | */ | |
1109 | static int map_persist_bufs(struct ibmvscsi_host_data *hostdata) | |
1110 | { | |
1111 | ||
1112 | hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps, | |
1113 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
1114 | ||
1115 | if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) { | |
1116 | dev_err(hostdata->dev, "Unable to map capabilities buffer!\n"); | |
1117 | return 1; | |
1118 | } | |
1119 | ||
1120 | hostdata->adapter_info_addr = dma_map_single(hostdata->dev, | |
1121 | &hostdata->madapter_info, | |
1122 | sizeof(hostdata->madapter_info), | |
1123 | DMA_BIDIRECTIONAL); | |
1124 | if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) { | |
1125 | dev_err(hostdata->dev, "Unable to map adapter info buffer!\n"); | |
1126 | dma_unmap_single(hostdata->dev, hostdata->caps_addr, | |
1127 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
1128 | return 1; | |
1129 | } | |
1130 | ||
1131 | return 0; | |
1132 | } | |
1133 | ||
1134 | /** | |
1135 | * unmap_persist_bufs: - Unmap persistent data needed for adapter logins | |
1136 | * @hostdata: ibmvscsi_host_data of host | |
1137 | * | |
1138 | * Unmap the capabilities and adapter info DMA buffers | |
1139 | */ | |
1140 | static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata) | |
1141 | { | |
1142 | dma_unmap_single(hostdata->dev, hostdata->caps_addr, | |
1143 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
1144 | ||
1145 | dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr, | |
1146 | sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL); | |
1147 | } | |
1148 | ||
3507e13f BK |
1149 | /** |
1150 | * login_rsp: - Handle response to SRP login request | |
1151 | * @evt_struct: srp_event_struct with the response | |
1152 | * | |
1153 | * Used as a "done" callback by when sending srp_login. Gets called | |
1154 | * by ibmvscsi_handle_crq() | |
1155 | */ | |
1156 | static void login_rsp(struct srp_event_struct *evt_struct) | |
1157 | { | |
1158 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
1159 | switch (evt_struct->xfer_iu->srp.login_rsp.opcode) { | |
1160 | case SRP_LOGIN_RSP: /* it worked! */ | |
1161 | break; | |
1162 | case SRP_LOGIN_REJ: /* refused! */ | |
1163 | dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n", | |
1164 | evt_struct->xfer_iu->srp.login_rej.reason); | |
1165 | /* Login failed. */ | |
665e0224 | 1166 | ibmvscsi_set_request_limit(hostdata, -1); |
3507e13f BK |
1167 | return; |
1168 | default: | |
1169 | dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n", | |
1170 | evt_struct->xfer_iu->srp.login_rsp.opcode); | |
1171 | /* Login failed. */ | |
665e0224 | 1172 | ibmvscsi_set_request_limit(hostdata, -1); |
3507e13f BK |
1173 | return; |
1174 | } | |
1175 | ||
1176 | dev_info(hostdata->dev, "SRP_LOGIN succeeded\n"); | |
126c5cc3 | 1177 | hostdata->client_migrated = 0; |
3507e13f BK |
1178 | |
1179 | /* Now we know what the real request-limit is. | |
1180 | * This value is set rather than added to request_limit because | |
1181 | * request_limit could have been set to -1 by this client. | |
1182 | */ | |
665e0224 | 1183 | ibmvscsi_set_request_limit(hostdata, |
72264eb6 | 1184 | be32_to_cpu(evt_struct->xfer_iu->srp.login_rsp.req_lim_delta)); |
3507e13f BK |
1185 | |
1186 | /* If we had any pending I/Os, kick them */ | |
aa343c69 TD |
1187 | hostdata->action = IBMVSCSI_HOST_ACTION_UNBLOCK; |
1188 | wake_up(&hostdata->work_wait_q); | |
3507e13f BK |
1189 | } |
1190 | ||
1191 | /** | |
1192 | * send_srp_login: - Sends the srp login | |
1193 | * @hostdata: ibmvscsi_host_data of host | |
1194 | * | |
1195 | * Returns zero if successful. | |
1196 | */ | |
1197 | static int send_srp_login(struct ibmvscsi_host_data *hostdata) | |
1198 | { | |
1199 | int rc; | |
1200 | unsigned long flags; | |
1201 | struct srp_login_req *login; | |
1202 | struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool); | |
1203 | ||
1204 | BUG_ON(!evt_struct); | |
1205 | init_event_struct(evt_struct, login_rsp, | |
1206 | VIOSRP_SRP_FORMAT, login_timeout); | |
1207 | ||
1208 | login = &evt_struct->iu.srp.login_req; | |
1209 | memset(login, 0, sizeof(*login)); | |
1210 | login->opcode = SRP_LOGIN_REQ; | |
72264eb6 AB |
1211 | login->req_it_iu_len = cpu_to_be32(sizeof(union srp_iu)); |
1212 | login->req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | | |
1213 | SRP_BUF_FORMAT_INDIRECT); | |
3507e13f | 1214 | |
3507e13f BK |
1215 | /* Start out with a request limit of 0, since this is negotiated in |
1216 | * the login request we are just sending and login requests always | |
1217 | * get sent by the driver regardless of request_limit. | |
1218 | */ | |
665e0224 | 1219 | ibmvscsi_set_request_limit(hostdata, 0); |
3507e13f | 1220 | |
665e0224 | 1221 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
3507e13f BK |
1222 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2); |
1223 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1224 | dev_info(hostdata->dev, "sent SRP login\n"); | |
1225 | return rc; | |
1226 | }; | |
1227 | ||
126c5cc3 BK |
1228 | /** |
1229 | * capabilities_rsp: - Handle response to MAD adapter capabilities request | |
1230 | * @evt_struct: srp_event_struct with the response | |
1231 | * | |
1232 | * Used as a "done" callback by when sending adapter_info. | |
1233 | */ | |
1234 | static void capabilities_rsp(struct srp_event_struct *evt_struct) | |
1235 | { | |
1236 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
1237 | ||
1238 | if (evt_struct->xfer_iu->mad.capabilities.common.status) { | |
1239 | dev_err(hostdata->dev, "error 0x%X getting capabilities info\n", | |
1240 | evt_struct->xfer_iu->mad.capabilities.common.status); | |
1241 | } else { | |
72264eb6 AB |
1242 | if (hostdata->caps.migration.common.server_support != |
1243 | cpu_to_be16(SERVER_SUPPORTS_CAP)) | |
126c5cc3 BK |
1244 | dev_info(hostdata->dev, "Partition migration not supported\n"); |
1245 | ||
1246 | if (client_reserve) { | |
1247 | if (hostdata->caps.reserve.common.server_support == | |
72264eb6 | 1248 | cpu_to_be16(SERVER_SUPPORTS_CAP)) |
126c5cc3 BK |
1249 | dev_info(hostdata->dev, "Client reserve enabled\n"); |
1250 | else | |
1251 | dev_info(hostdata->dev, "Client reserve not supported\n"); | |
1252 | } | |
1253 | } | |
1254 | ||
1255 | send_srp_login(hostdata); | |
1256 | } | |
1257 | ||
1258 | /** | |
1259 | * send_mad_capabilities: - Sends the mad capabilities request | |
1260 | * and stores the result so it can be retrieved with | |
1261 | * @hostdata: ibmvscsi_host_data of host | |
1262 | */ | |
1263 | static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata) | |
1264 | { | |
1265 | struct viosrp_capabilities *req; | |
1266 | struct srp_event_struct *evt_struct; | |
1267 | unsigned long flags; | |
61c7a080 | 1268 | struct device_node *of_node = hostdata->dev->of_node; |
126c5cc3 BK |
1269 | const char *location; |
1270 | ||
1271 | evt_struct = get_event_struct(&hostdata->pool); | |
1272 | BUG_ON(!evt_struct); | |
1273 | ||
1274 | init_event_struct(evt_struct, capabilities_rsp, | |
1275 | VIOSRP_MAD_FORMAT, info_timeout); | |
1276 | ||
1277 | req = &evt_struct->iu.mad.capabilities; | |
1278 | memset(req, 0, sizeof(*req)); | |
1279 | ||
72264eb6 | 1280 | hostdata->caps.flags = cpu_to_be32(CAP_LIST_SUPPORTED); |
126c5cc3 | 1281 | if (hostdata->client_migrated) |
72264eb6 | 1282 | hostdata->caps.flags |= cpu_to_be32(CLIENT_MIGRATED); |
126c5cc3 | 1283 | |
a5445238 | 1284 | strlcpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev), |
126c5cc3 | 1285 | sizeof(hostdata->caps.name)); |
126c5cc3 BK |
1286 | |
1287 | location = of_get_property(of_node, "ibm,loc-code", NULL); | |
1288 | location = location ? location : dev_name(hostdata->dev); | |
a5445238 | 1289 | strlcpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc)); |
126c5cc3 | 1290 | |
72264eb6 AB |
1291 | req->common.type = cpu_to_be32(VIOSRP_CAPABILITIES_TYPE); |
1292 | req->buffer = cpu_to_be64(hostdata->caps_addr); | |
126c5cc3 | 1293 | |
72264eb6 AB |
1294 | hostdata->caps.migration.common.cap_type = |
1295 | cpu_to_be32(MIGRATION_CAPABILITIES); | |
1296 | hostdata->caps.migration.common.length = | |
1297 | cpu_to_be16(sizeof(hostdata->caps.migration)); | |
1298 | hostdata->caps.migration.common.server_support = | |
1299 | cpu_to_be16(SERVER_SUPPORTS_CAP); | |
1300 | hostdata->caps.migration.ecl = cpu_to_be32(1); | |
126c5cc3 BK |
1301 | |
1302 | if (client_reserve) { | |
72264eb6 AB |
1303 | hostdata->caps.reserve.common.cap_type = |
1304 | cpu_to_be32(RESERVATION_CAPABILITIES); | |
1305 | hostdata->caps.reserve.common.length = | |
1306 | cpu_to_be16(sizeof(hostdata->caps.reserve)); | |
1307 | hostdata->caps.reserve.common.server_support = | |
1308 | cpu_to_be16(SERVER_SUPPORTS_CAP); | |
1309 | hostdata->caps.reserve.type = | |
1310 | cpu_to_be32(CLIENT_RESERVE_SCSI_2); | |
1311 | req->common.length = | |
1312 | cpu_to_be16(sizeof(hostdata->caps)); | |
126c5cc3 | 1313 | } else |
72264eb6 AB |
1314 | req->common.length = cpu_to_be16(sizeof(hostdata->caps) - |
1315 | sizeof(hostdata->caps.reserve)); | |
126c5cc3 BK |
1316 | |
1317 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1318 | if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) | |
1319 | dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n"); | |
1320 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1321 | }; | |
1322 | ||
c1988e31 RJ |
1323 | /** |
1324 | * fast_fail_rsp: - Handle response to MAD enable fast fail | |
1325 | * @evt_struct: srp_event_struct with the response | |
1326 | * | |
1327 | * Used as a "done" callback by when sending enable fast fail. Gets called | |
1328 | * by ibmvscsi_handle_crq() | |
1329 | */ | |
1330 | static void fast_fail_rsp(struct srp_event_struct *evt_struct) | |
1331 | { | |
1332 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
72264eb6 | 1333 | u16 status = be16_to_cpu(evt_struct->xfer_iu->mad.fast_fail.common.status); |
c1988e31 RJ |
1334 | |
1335 | if (status == VIOSRP_MAD_NOT_SUPPORTED) | |
1336 | dev_err(hostdata->dev, "fast_fail not supported in server\n"); | |
1337 | else if (status == VIOSRP_MAD_FAILED) | |
1338 | dev_err(hostdata->dev, "fast_fail request failed\n"); | |
1339 | else if (status != VIOSRP_MAD_SUCCESS) | |
1340 | dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status); | |
1341 | ||
126c5cc3 | 1342 | send_mad_capabilities(hostdata); |
c1988e31 RJ |
1343 | } |
1344 | ||
1345 | /** | |
841d7df0 | 1346 | * enable_fast_fail() - Start host initialization |
c1988e31 RJ |
1347 | * @hostdata: ibmvscsi_host_data of host |
1348 | * | |
1349 | * Returns zero if successful. | |
1350 | */ | |
1351 | static int enable_fast_fail(struct ibmvscsi_host_data *hostdata) | |
1352 | { | |
1353 | int rc; | |
1354 | unsigned long flags; | |
1355 | struct viosrp_fast_fail *fast_fail_mad; | |
1356 | struct srp_event_struct *evt_struct; | |
1357 | ||
126c5cc3 BK |
1358 | if (!fast_fail) { |
1359 | send_mad_capabilities(hostdata); | |
1360 | return 0; | |
1361 | } | |
c1988e31 RJ |
1362 | |
1363 | evt_struct = get_event_struct(&hostdata->pool); | |
1364 | BUG_ON(!evt_struct); | |
1365 | ||
1366 | init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout); | |
1367 | ||
1368 | fast_fail_mad = &evt_struct->iu.mad.fast_fail; | |
1369 | memset(fast_fail_mad, 0, sizeof(*fast_fail_mad)); | |
72264eb6 AB |
1370 | fast_fail_mad->common.type = cpu_to_be32(VIOSRP_ENABLE_FAST_FAIL); |
1371 | fast_fail_mad->common.length = cpu_to_be16(sizeof(*fast_fail_mad)); | |
c1988e31 RJ |
1372 | |
1373 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1374 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2); | |
1375 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1376 | return rc; | |
1377 | } | |
1378 | ||
1da177e4 LT |
1379 | /** |
1380 | * adapter_info_rsp: - Handle response to MAD adapter info request | |
1381 | * @evt_struct: srp_event_struct with the response | |
1382 | * | |
1383 | * Used as a "done" callback by when sending adapter_info. Gets called | |
1384 | * by ibmvscsi_handle_crq() | |
1385 | */ | |
1386 | static void adapter_info_rsp(struct srp_event_struct *evt_struct) | |
1387 | { | |
1388 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
1da177e4 LT |
1389 | |
1390 | if (evt_struct->xfer_iu->mad.adapter_info.common.status) { | |
6c0a60ec BK |
1391 | dev_err(hostdata->dev, "error %d getting adapter info\n", |
1392 | evt_struct->xfer_iu->mad.adapter_info.common.status); | |
1da177e4 | 1393 | } else { |
6c0a60ec BK |
1394 | dev_info(hostdata->dev, "host srp version: %s, " |
1395 | "host partition %s (%d), OS %d, max io %u\n", | |
1396 | hostdata->madapter_info.srp_version, | |
1397 | hostdata->madapter_info.partition_name, | |
72264eb6 AB |
1398 | be32_to_cpu(hostdata->madapter_info.partition_number), |
1399 | be32_to_cpu(hostdata->madapter_info.os_type), | |
1400 | be32_to_cpu(hostdata->madapter_info.port_max_txu[0])); | |
1da177e4 LT |
1401 | |
1402 | if (hostdata->madapter_info.port_max_txu[0]) | |
1403 | hostdata->host->max_sectors = | |
72264eb6 | 1404 | be32_to_cpu(hostdata->madapter_info.port_max_txu[0]) >> 9; |
154fb614 | 1405 | |
45d8c30f | 1406 | if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX && |
154fb614 | 1407 | strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) { |
6c0a60ec BK |
1408 | dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n", |
1409 | hostdata->madapter_info.srp_version); | |
1410 | dev_err(hostdata->dev, "limiting scatterlists to %d\n", | |
1411 | MAX_INDIRECT_BUFS); | |
154fb614 DB |
1412 | hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS; |
1413 | } | |
e08afeb7 | 1414 | |
45d8c30f | 1415 | if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX) { |
e08afeb7 BK |
1416 | enable_fast_fail(hostdata); |
1417 | return; | |
1418 | } | |
1da177e4 | 1419 | } |
3507e13f | 1420 | |
e08afeb7 | 1421 | send_srp_login(hostdata); |
1da177e4 LT |
1422 | } |
1423 | ||
1424 | /** | |
1425 | * send_mad_adapter_info: - Sends the mad adapter info request | |
1426 | * and stores the result so it can be retrieved with | |
1427 | * sysfs. We COULD consider causing a failure if the | |
1428 | * returned SRP version doesn't match ours. | |
1429 | * @hostdata: ibmvscsi_host_data of host | |
1430 | * | |
1431 | * Returns zero if successful. | |
1432 | */ | |
1433 | static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata) | |
1434 | { | |
1435 | struct viosrp_adapter_info *req; | |
1436 | struct srp_event_struct *evt_struct; | |
06f923cb | 1437 | unsigned long flags; |
e5dbfa66 | 1438 | |
1da177e4 | 1439 | evt_struct = get_event_struct(&hostdata->pool); |
3507e13f | 1440 | BUG_ON(!evt_struct); |
1da177e4 LT |
1441 | |
1442 | init_event_struct(evt_struct, | |
1443 | adapter_info_rsp, | |
1444 | VIOSRP_MAD_FORMAT, | |
e1a5ce5b | 1445 | info_timeout); |
1da177e4 LT |
1446 | |
1447 | req = &evt_struct->iu.mad.adapter_info; | |
1448 | memset(req, 0x00, sizeof(*req)); | |
1449 | ||
72264eb6 AB |
1450 | req->common.type = cpu_to_be32(VIOSRP_ADAPTER_INFO_TYPE); |
1451 | req->common.length = cpu_to_be16(sizeof(hostdata->madapter_info)); | |
1452 | req->buffer = cpu_to_be64(hostdata->adapter_info_addr); | |
1da177e4 | 1453 | |
06f923cb | 1454 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
126c5cc3 | 1455 | if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) |
6c0a60ec | 1456 | dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n"); |
06f923cb | 1457 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1458 | }; |
1459 | ||
841d7df0 LJ |
1460 | /* |
1461 | * init_adapter() - Start virtual adapter initialization sequence | |
3507e13f BK |
1462 | */ |
1463 | static void init_adapter(struct ibmvscsi_host_data *hostdata) | |
1da177e4 | 1464 | { |
1da177e4 | 1465 | send_mad_adapter_info(hostdata); |
1da177e4 LT |
1466 | } |
1467 | ||
841d7df0 | 1468 | /* |
1da177e4 LT |
1469 | * sync_completion: Signal that a synchronous command has completed |
1470 | * Note that after returning from this call, the evt_struct is freed. | |
1471 | * the caller waiting on this completion shouldn't touch the evt_struct | |
1472 | * again. | |
1473 | */ | |
1474 | static void sync_completion(struct srp_event_struct *evt_struct) | |
1475 | { | |
1476 | /* copy the response back */ | |
1477 | if (evt_struct->sync_srp) | |
1478 | *evt_struct->sync_srp = *evt_struct->xfer_iu; | |
1479 | ||
1480 | complete(&evt_struct->comp); | |
1481 | } | |
1482 | ||
841d7df0 LJ |
1483 | /* |
1484 | * ibmvscsi_eh_abort_handler: Abort a command...from scsi host template | |
1da177e4 LT |
1485 | * send this over to the server and wait synchronously for the response |
1486 | */ | |
1487 | static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd) | |
1488 | { | |
7603e02e | 1489 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 LT |
1490 | struct srp_tsk_mgmt *tsk_mgmt; |
1491 | struct srp_event_struct *evt; | |
1492 | struct srp_event_struct *tmp_evt, *found_evt; | |
1493 | union viosrp_iu srp_rsp; | |
1494 | int rsp_rc; | |
be042f24 | 1495 | unsigned long flags; |
1da177e4 | 1496 | u16 lun = lun_from_dev(cmd->device); |
860784c8 | 1497 | unsigned long wait_switch = 0; |
1da177e4 LT |
1498 | |
1499 | /* First, find this command in our sent list so we can figure | |
1500 | * out the correct tag | |
1501 | */ | |
be042f24 | 1502 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
860784c8 RJ |
1503 | wait_switch = jiffies + (init_timeout * HZ); |
1504 | do { | |
1505 | found_evt = NULL; | |
1506 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
1507 | if (tmp_evt->cmnd == cmd) { | |
1508 | found_evt = tmp_evt; | |
1509 | break; | |
1510 | } | |
1da177e4 | 1511 | } |
1da177e4 | 1512 | |
860784c8 RJ |
1513 | if (!found_evt) { |
1514 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1515 | return SUCCESS; | |
1516 | } | |
1da177e4 | 1517 | |
860784c8 RJ |
1518 | evt = get_event_struct(&hostdata->pool); |
1519 | if (evt == NULL) { | |
1520 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1521 | sdev_printk(KERN_ERR, cmd->device, | |
1522 | "failed to allocate abort event\n"); | |
1523 | return FAILED; | |
1524 | } | |
1da177e4 | 1525 | |
860784c8 RJ |
1526 | init_event_struct(evt, |
1527 | sync_completion, | |
1528 | VIOSRP_SRP_FORMAT, | |
e1a5ce5b | 1529 | abort_timeout); |
1da177e4 | 1530 | |
860784c8 | 1531 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
1da177e4 | 1532 | |
860784c8 RJ |
1533 | /* Set up an abort SRP command */ |
1534 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
1535 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
985aa495 | 1536 | int_to_scsilun(lun, &tsk_mgmt->lun); |
860784c8 RJ |
1537 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK; |
1538 | tsk_mgmt->task_tag = (u64) found_evt; | |
1539 | ||
1540 | evt->sync_srp = &srp_rsp; | |
1541 | ||
1542 | init_completion(&evt->comp); | |
e1a5ce5b | 1543 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2); |
860784c8 RJ |
1544 | |
1545 | if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) | |
1546 | break; | |
1547 | ||
1548 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1549 | msleep(10); | |
1550 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1551 | } while (time_before(jiffies, wait_switch)); | |
1552 | ||
be042f24 | 1553 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
860784c8 | 1554 | |
be042f24 | 1555 | if (rsp_rc != 0) { |
6c0a60ec BK |
1556 | sdev_printk(KERN_ERR, cmd->device, |
1557 | "failed to send abort() event. rc=%d\n", rsp_rc); | |
1da177e4 LT |
1558 | return FAILED; |
1559 | } | |
1560 | ||
860784c8 | 1561 | sdev_printk(KERN_INFO, cmd->device, |
fe333321 | 1562 | "aborting command. lun 0x%llx, tag 0x%llx\n", |
860784c8 RJ |
1563 | (((u64) lun) << 48), (u64) found_evt); |
1564 | ||
1da177e4 | 1565 | wait_for_completion(&evt->comp); |
1da177e4 LT |
1566 | |
1567 | /* make sure we got a good response */ | |
ef265673 | 1568 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 | 1569 | if (printk_ratelimit()) |
6c0a60ec BK |
1570 | sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n", |
1571 | srp_rsp.srp.rsp.opcode); | |
1da177e4 LT |
1572 | return FAILED; |
1573 | } | |
1574 | ||
ef265673 FT |
1575 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1576 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1577 | else |
1578 | rsp_rc = srp_rsp.srp.rsp.status; | |
1579 | ||
1580 | if (rsp_rc) { | |
1581 | if (printk_ratelimit()) | |
6c0a60ec | 1582 | sdev_printk(KERN_WARNING, cmd->device, |
fe333321 | 1583 | "abort code %d for task tag 0x%llx\n", |
6c0a60ec | 1584 | rsp_rc, tsk_mgmt->task_tag); |
1da177e4 LT |
1585 | return FAILED; |
1586 | } | |
1587 | ||
1588 | /* Because we dropped the spinlock above, it's possible | |
1589 | * The event is no longer in our list. Make sure it didn't | |
1590 | * complete while we were aborting | |
1591 | */ | |
be042f24 | 1592 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1593 | found_evt = NULL; |
1594 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
1595 | if (tmp_evt->cmnd == cmd) { | |
1596 | found_evt = tmp_evt; | |
1597 | break; | |
1598 | } | |
1599 | } | |
1600 | ||
1601 | if (found_evt == NULL) { | |
be042f24 | 1602 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
fe333321 | 1603 | sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n", |
6c0a60ec | 1604 | tsk_mgmt->task_tag); |
1da177e4 LT |
1605 | return SUCCESS; |
1606 | } | |
1607 | ||
fe333321 | 1608 | sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n", |
6c0a60ec | 1609 | tsk_mgmt->task_tag); |
1da177e4 LT |
1610 | |
1611 | cmd->result = (DID_ABORT << 16); | |
1612 | list_del(&found_evt->list); | |
4dddbc26 JB |
1613 | unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt, |
1614 | found_evt->hostdata->dev); | |
1da177e4 | 1615 | free_event_struct(&found_evt->hostdata->pool, found_evt); |
be042f24 | 1616 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1617 | atomic_inc(&hostdata->request_limit); |
1618 | return SUCCESS; | |
1619 | } | |
1620 | ||
841d7df0 | 1621 | /* |
1da177e4 LT |
1622 | * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host |
1623 | * template send this over to the server and wait synchronously for the | |
1624 | * response | |
1625 | */ | |
1626 | static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd) | |
1627 | { | |
7603e02e | 1628 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 LT |
1629 | struct srp_tsk_mgmt *tsk_mgmt; |
1630 | struct srp_event_struct *evt; | |
1631 | struct srp_event_struct *tmp_evt, *pos; | |
1632 | union viosrp_iu srp_rsp; | |
1633 | int rsp_rc; | |
be042f24 | 1634 | unsigned long flags; |
1da177e4 | 1635 | u16 lun = lun_from_dev(cmd->device); |
860784c8 | 1636 | unsigned long wait_switch = 0; |
1da177e4 | 1637 | |
be042f24 | 1638 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
860784c8 RJ |
1639 | wait_switch = jiffies + (init_timeout * HZ); |
1640 | do { | |
1641 | evt = get_event_struct(&hostdata->pool); | |
1642 | if (evt == NULL) { | |
1643 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1644 | sdev_printk(KERN_ERR, cmd->device, | |
1645 | "failed to allocate reset event\n"); | |
1646 | return FAILED; | |
1647 | } | |
1da177e4 | 1648 | |
860784c8 RJ |
1649 | init_event_struct(evt, |
1650 | sync_completion, | |
1651 | VIOSRP_SRP_FORMAT, | |
e1a5ce5b | 1652 | reset_timeout); |
1da177e4 | 1653 | |
860784c8 | 1654 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
1da177e4 | 1655 | |
860784c8 RJ |
1656 | /* Set up a lun reset SRP command */ |
1657 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
1658 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
985aa495 | 1659 | int_to_scsilun(lun, &tsk_mgmt->lun); |
860784c8 | 1660 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET; |
1da177e4 | 1661 | |
860784c8 RJ |
1662 | evt->sync_srp = &srp_rsp; |
1663 | ||
1664 | init_completion(&evt->comp); | |
e1a5ce5b | 1665 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2); |
860784c8 RJ |
1666 | |
1667 | if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) | |
1668 | break; | |
1669 | ||
1670 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1671 | msleep(10); | |
1672 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1673 | } while (time_before(jiffies, wait_switch)); | |
1da177e4 | 1674 | |
be042f24 | 1675 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
860784c8 | 1676 | |
be042f24 | 1677 | if (rsp_rc != 0) { |
6c0a60ec BK |
1678 | sdev_printk(KERN_ERR, cmd->device, |
1679 | "failed to send reset event. rc=%d\n", rsp_rc); | |
1da177e4 LT |
1680 | return FAILED; |
1681 | } | |
1682 | ||
fe333321 | 1683 | sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n", |
860784c8 RJ |
1684 | (((u64) lun) << 48)); |
1685 | ||
1da177e4 | 1686 | wait_for_completion(&evt->comp); |
1da177e4 LT |
1687 | |
1688 | /* make sure we got a good response */ | |
ef265673 | 1689 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 | 1690 | if (printk_ratelimit()) |
6c0a60ec BK |
1691 | sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n", |
1692 | srp_rsp.srp.rsp.opcode); | |
1da177e4 LT |
1693 | return FAILED; |
1694 | } | |
1695 | ||
ef265673 FT |
1696 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1697 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1698 | else |
1699 | rsp_rc = srp_rsp.srp.rsp.status; | |
1700 | ||
1701 | if (rsp_rc) { | |
1702 | if (printk_ratelimit()) | |
6c0a60ec | 1703 | sdev_printk(KERN_WARNING, cmd->device, |
fe333321 | 1704 | "reset code %d for task tag 0x%llx\n", |
6c0a60ec | 1705 | rsp_rc, tsk_mgmt->task_tag); |
1da177e4 LT |
1706 | return FAILED; |
1707 | } | |
1708 | ||
1709 | /* We need to find all commands for this LUN that have not yet been | |
1710 | * responded to, and fail them with DID_RESET | |
1711 | */ | |
be042f24 | 1712 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1713 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { |
1714 | if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) { | |
1715 | if (tmp_evt->cmnd) | |
1716 | tmp_evt->cmnd->result = (DID_RESET << 16); | |
1717 | list_del(&tmp_evt->list); | |
4dddbc26 JB |
1718 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt, |
1719 | tmp_evt->hostdata->dev); | |
1da177e4 LT |
1720 | free_event_struct(&tmp_evt->hostdata->pool, |
1721 | tmp_evt); | |
1722 | atomic_inc(&hostdata->request_limit); | |
1723 | if (tmp_evt->cmnd_done) | |
1724 | tmp_evt->cmnd_done(tmp_evt->cmnd); | |
1725 | else if (tmp_evt->done) | |
1726 | tmp_evt->done(tmp_evt); | |
1727 | } | |
1728 | } | |
be042f24 | 1729 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1730 | return SUCCESS; |
1731 | } | |
1732 | ||
1733 | /** | |
3d0e91f7 BK |
1734 | * ibmvscsi_eh_host_reset_handler - Reset the connection to the server |
1735 | * @cmd: struct scsi_cmnd having problems | |
1736 | */ | |
1737 | static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd) | |
1da177e4 | 1738 | { |
3d0e91f7 | 1739 | unsigned long wait_switch = 0; |
7603e02e | 1740 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 | 1741 | |
3d0e91f7 BK |
1742 | dev_err(hostdata->dev, "Resetting connection due to error recovery\n"); |
1743 | ||
1744 | ibmvscsi_reset_host(hostdata); | |
1745 | ||
1746 | for (wait_switch = jiffies + (init_timeout * HZ); | |
1747 | time_before(jiffies, wait_switch) && | |
1748 | atomic_read(&hostdata->request_limit) < 2;) { | |
1749 | ||
1750 | msleep(10); | |
1da177e4 | 1751 | } |
3d0e91f7 BK |
1752 | |
1753 | if (atomic_read(&hostdata->request_limit) <= 0) | |
1754 | return FAILED; | |
1755 | ||
1756 | return SUCCESS; | |
1da177e4 LT |
1757 | } |
1758 | ||
1759 | /** | |
1760 | * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ | |
1761 | * @crq: Command/Response queue | |
1762 | * @hostdata: ibmvscsi_host_data of host | |
1763 | * | |
1764 | */ | |
9965c2f1 BH |
1765 | static void ibmvscsi_handle_crq(struct viosrp_crq *crq, |
1766 | struct ibmvscsi_host_data *hostdata) | |
1da177e4 | 1767 | { |
6c0a60ec | 1768 | long rc; |
1da177e4 | 1769 | unsigned long flags; |
72264eb6 | 1770 | /* The hypervisor copies our tag value here so no byteswapping */ |
1da177e4 | 1771 | struct srp_event_struct *evt_struct = |
72264eb6 | 1772 | (__force struct srp_event_struct *)crq->IU_data_ptr; |
1da177e4 | 1773 | switch (crq->valid) { |
55c9b1e5 | 1774 | case VIOSRP_CRQ_INIT_RSP: /* initialization */ |
1da177e4 | 1775 | switch (crq->format) { |
55c9b1e5 | 1776 | case VIOSRP_CRQ_INIT: /* Initialization message */ |
6c0a60ec | 1777 | dev_info(hostdata->dev, "partner initialized\n"); |
1da177e4 | 1778 | /* Send back a response */ |
9965c2f1 BH |
1779 | rc = ibmvscsi_send_crq(hostdata, 0xC002000000000000LL, 0); |
1780 | if (rc == 0) { | |
1da177e4 | 1781 | /* Now login */ |
3507e13f | 1782 | init_adapter(hostdata); |
1da177e4 | 1783 | } else { |
6c0a60ec | 1784 | dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc); |
1da177e4 LT |
1785 | } |
1786 | ||
1787 | break; | |
55c9b1e5 | 1788 | case VIOSRP_CRQ_INIT_COMPLETE: /* Initialization response */ |
6c0a60ec | 1789 | dev_info(hostdata->dev, "partner initialization complete\n"); |
1da177e4 LT |
1790 | |
1791 | /* Now login */ | |
3507e13f | 1792 | init_adapter(hostdata); |
1da177e4 LT |
1793 | break; |
1794 | default: | |
6c0a60ec | 1795 | dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format); |
1da177e4 LT |
1796 | } |
1797 | return; | |
55c9b1e5 | 1798 | case VIOSRP_CRQ_XPORT_EVENT: /* Hypervisor telling us the connection is closed */ |
2b541f8f | 1799 | scsi_block_requests(hostdata->host); |
665e0224 | 1800 | ibmvscsi_set_request_limit(hostdata, 0); |
2b541f8f DB |
1801 | if (crq->format == 0x06) { |
1802 | /* We need to re-setup the interpartition connection */ | |
6c0a60ec | 1803 | dev_info(hostdata->dev, "Re-enabling adapter!\n"); |
126c5cc3 | 1804 | hostdata->client_migrated = 1; |
6e40de8b | 1805 | hostdata->action = IBMVSCSI_HOST_ACTION_REENABLE; |
2b541f8f | 1806 | purge_requests(hostdata, DID_REQUEUE); |
0f33ece5 | 1807 | wake_up(&hostdata->work_wait_q); |
2b541f8f | 1808 | } else { |
6c0a60ec BK |
1809 | dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n", |
1810 | crq->format); | |
0f33ece5 | 1811 | ibmvscsi_reset_host(hostdata); |
2b541f8f | 1812 | } |
1da177e4 | 1813 | return; |
55c9b1e5 | 1814 | case VIOSRP_CRQ_CMD_RSP: /* real payload */ |
1da177e4 LT |
1815 | break; |
1816 | default: | |
6c0a60ec BK |
1817 | dev_err(hostdata->dev, "got an invalid message type 0x%02x\n", |
1818 | crq->valid); | |
1da177e4 LT |
1819 | return; |
1820 | } | |
1821 | ||
1822 | /* The only kind of payload CRQs we should get are responses to | |
1823 | * things we send. Make sure this response is to something we | |
1824 | * actually sent | |
1825 | */ | |
1826 | if (!valid_event_struct(&hostdata->pool, evt_struct)) { | |
6c0a60ec | 1827 | dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n", |
72264eb6 | 1828 | evt_struct); |
1da177e4 LT |
1829 | return; |
1830 | } | |
1831 | ||
1832 | if (atomic_read(&evt_struct->free)) { | |
6c0a60ec | 1833 | dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n", |
72264eb6 | 1834 | evt_struct); |
1da177e4 LT |
1835 | return; |
1836 | } | |
1837 | ||
1838 | if (crq->format == VIOSRP_SRP_FORMAT) | |
72264eb6 | 1839 | atomic_add(be32_to_cpu(evt_struct->xfer_iu->srp.rsp.req_lim_delta), |
1da177e4 LT |
1840 | &hostdata->request_limit); |
1841 | ||
3d0e91f7 BK |
1842 | del_timer(&evt_struct->timer); |
1843 | ||
ca61668b | 1844 | if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd) |
c3a3b55a | 1845 | evt_struct->cmnd->result = DID_ERROR << 16; |
1da177e4 LT |
1846 | if (evt_struct->done) |
1847 | evt_struct->done(evt_struct); | |
1848 | else | |
6c0a60ec | 1849 | dev_err(hostdata->dev, "returned done() is NULL; not running it!\n"); |
1da177e4 LT |
1850 | |
1851 | /* | |
1852 | * Lock the host_lock before messing with these structures, since we | |
1853 | * are running in a task context | |
1854 | */ | |
1855 | spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags); | |
1856 | list_del(&evt_struct->list); | |
1857 | free_event_struct(&evt_struct->hostdata->pool, evt_struct); | |
1858 | spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags); | |
1859 | } | |
1860 | ||
0979c84b RJ |
1861 | /** |
1862 | * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk. | |
1863 | * @sdev: struct scsi_device device to configure | |
1864 | * | |
1865 | * Enable allow_restart for a device if it is a disk. Adjust the | |
1866 | * queue_depth here also as is required by the documentation for | |
1867 | * struct scsi_host_template. | |
1868 | */ | |
1869 | static int ibmvscsi_slave_configure(struct scsi_device *sdev) | |
1870 | { | |
1871 | struct Scsi_Host *shost = sdev->host; | |
1872 | unsigned long lock_flags = 0; | |
1873 | ||
1874 | spin_lock_irqsave(shost->host_lock, lock_flags); | |
d1a357fc | 1875 | if (sdev->type == TYPE_DISK) { |
0979c84b | 1876 | sdev->allow_restart = 1; |
e1a5ce5b | 1877 | blk_queue_rq_timeout(sdev->request_queue, 120 * HZ); |
d1a357fc | 1878 | } |
0979c84b RJ |
1879 | spin_unlock_irqrestore(shost->host_lock, lock_flags); |
1880 | return 0; | |
1881 | } | |
1882 | ||
742d25b8 BK |
1883 | /** |
1884 | * ibmvscsi_change_queue_depth - Change the device's queue depth | |
1885 | * @sdev: scsi device struct | |
1886 | * @qdepth: depth to set | |
1887 | * | |
1888 | * Return value: | |
1889 | * actual depth set | |
1890 | **/ | |
db5ed4df | 1891 | static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth) |
742d25b8 BK |
1892 | { |
1893 | if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN) | |
1894 | qdepth = IBMVSCSI_MAX_CMDS_PER_LUN; | |
db5ed4df | 1895 | return scsi_change_queue_depth(sdev, qdepth); |
742d25b8 BK |
1896 | } |
1897 | ||
1da177e4 LT |
1898 | /* ------------------------------------------------------------ |
1899 | * sysfs attributes | |
1900 | */ | |
126c5cc3 BK |
1901 | static ssize_t show_host_vhost_loc(struct device *dev, |
1902 | struct device_attribute *attr, char *buf) | |
1903 | { | |
1904 | struct Scsi_Host *shost = class_to_shost(dev); | |
1905 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); | |
1906 | int len; | |
1907 | ||
1908 | len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n", | |
1909 | hostdata->caps.loc); | |
1910 | return len; | |
1911 | } | |
1912 | ||
1913 | static struct device_attribute ibmvscsi_host_vhost_loc = { | |
1914 | .attr = { | |
1915 | .name = "vhost_loc", | |
1916 | .mode = S_IRUGO, | |
1917 | }, | |
1918 | .show = show_host_vhost_loc, | |
1919 | }; | |
1920 | ||
1921 | static ssize_t show_host_vhost_name(struct device *dev, | |
1922 | struct device_attribute *attr, char *buf) | |
1923 | { | |
1924 | struct Scsi_Host *shost = class_to_shost(dev); | |
1925 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); | |
1926 | int len; | |
1927 | ||
1928 | len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n", | |
1929 | hostdata->caps.name); | |
1930 | return len; | |
1931 | } | |
1932 | ||
1933 | static struct device_attribute ibmvscsi_host_vhost_name = { | |
1934 | .attr = { | |
1935 | .name = "vhost_name", | |
1936 | .mode = S_IRUGO, | |
1937 | }, | |
1938 | .show = show_host_vhost_name, | |
1939 | }; | |
1940 | ||
ee959b00 TJ |
1941 | static ssize_t show_host_srp_version(struct device *dev, |
1942 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1943 | { |
ee959b00 | 1944 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1945 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1946 | int len; |
1947 | ||
1948 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1949 | hostdata->madapter_info.srp_version); | |
1950 | return len; | |
1951 | } | |
1952 | ||
ee959b00 | 1953 | static struct device_attribute ibmvscsi_host_srp_version = { |
1da177e4 LT |
1954 | .attr = { |
1955 | .name = "srp_version", | |
1956 | .mode = S_IRUGO, | |
1957 | }, | |
1958 | .show = show_host_srp_version, | |
1959 | }; | |
1960 | ||
ee959b00 TJ |
1961 | static ssize_t show_host_partition_name(struct device *dev, |
1962 | struct device_attribute *attr, | |
1da177e4 LT |
1963 | char *buf) |
1964 | { | |
ee959b00 | 1965 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1966 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1967 | int len; |
1968 | ||
1969 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1970 | hostdata->madapter_info.partition_name); | |
1971 | return len; | |
1972 | } | |
1973 | ||
ee959b00 | 1974 | static struct device_attribute ibmvscsi_host_partition_name = { |
1da177e4 LT |
1975 | .attr = { |
1976 | .name = "partition_name", | |
1977 | .mode = S_IRUGO, | |
1978 | }, | |
1979 | .show = show_host_partition_name, | |
1980 | }; | |
1981 | ||
ee959b00 TJ |
1982 | static ssize_t show_host_partition_number(struct device *dev, |
1983 | struct device_attribute *attr, | |
1da177e4 LT |
1984 | char *buf) |
1985 | { | |
ee959b00 | 1986 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1987 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1988 | int len; |
1989 | ||
1990 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
f36948cb | 1991 | be32_to_cpu(hostdata->madapter_info.partition_number)); |
1da177e4 LT |
1992 | return len; |
1993 | } | |
1994 | ||
ee959b00 | 1995 | static struct device_attribute ibmvscsi_host_partition_number = { |
1da177e4 LT |
1996 | .attr = { |
1997 | .name = "partition_number", | |
1998 | .mode = S_IRUGO, | |
1999 | }, | |
2000 | .show = show_host_partition_number, | |
2001 | }; | |
2002 | ||
ee959b00 TJ |
2003 | static ssize_t show_host_mad_version(struct device *dev, |
2004 | struct device_attribute *attr, char *buf) | |
1da177e4 | 2005 | { |
ee959b00 | 2006 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 2007 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
2008 | int len; |
2009 | ||
2010 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
f36948cb | 2011 | be32_to_cpu(hostdata->madapter_info.mad_version)); |
1da177e4 LT |
2012 | return len; |
2013 | } | |
2014 | ||
ee959b00 | 2015 | static struct device_attribute ibmvscsi_host_mad_version = { |
1da177e4 LT |
2016 | .attr = { |
2017 | .name = "mad_version", | |
2018 | .mode = S_IRUGO, | |
2019 | }, | |
2020 | .show = show_host_mad_version, | |
2021 | }; | |
2022 | ||
ee959b00 TJ |
2023 | static ssize_t show_host_os_type(struct device *dev, |
2024 | struct device_attribute *attr, char *buf) | |
1da177e4 | 2025 | { |
ee959b00 | 2026 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 2027 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
2028 | int len; |
2029 | ||
f36948cb TD |
2030 | len = snprintf(buf, PAGE_SIZE, "%d\n", |
2031 | be32_to_cpu(hostdata->madapter_info.os_type)); | |
1da177e4 LT |
2032 | return len; |
2033 | } | |
2034 | ||
ee959b00 | 2035 | static struct device_attribute ibmvscsi_host_os_type = { |
1da177e4 LT |
2036 | .attr = { |
2037 | .name = "os_type", | |
2038 | .mode = S_IRUGO, | |
2039 | }, | |
2040 | .show = show_host_os_type, | |
2041 | }; | |
2042 | ||
ee959b00 TJ |
2043 | static ssize_t show_host_config(struct device *dev, |
2044 | struct device_attribute *attr, char *buf) | |
1da177e4 | 2045 | { |
0a1c0ebf | 2046 | return 0; |
1da177e4 LT |
2047 | } |
2048 | ||
ee959b00 | 2049 | static struct device_attribute ibmvscsi_host_config = { |
1da177e4 | 2050 | .attr = { |
0a1c0ebf TD |
2051 | .name = "config", |
2052 | .mode = S_IRUGO, | |
2053 | }, | |
1da177e4 LT |
2054 | .show = show_host_config, |
2055 | }; | |
2056 | ||
2e225204 TD |
2057 | static int ibmvscsi_host_reset(struct Scsi_Host *shost, int reset_type) |
2058 | { | |
2059 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); | |
2060 | ||
2061 | dev_info(hostdata->dev, "Initiating adapter reset!\n"); | |
2062 | ibmvscsi_reset_host(hostdata); | |
2063 | ||
2064 | return 0; | |
2065 | } | |
2066 | ||
ee959b00 | 2067 | static struct device_attribute *ibmvscsi_attrs[] = { |
126c5cc3 BK |
2068 | &ibmvscsi_host_vhost_loc, |
2069 | &ibmvscsi_host_vhost_name, | |
1da177e4 LT |
2070 | &ibmvscsi_host_srp_version, |
2071 | &ibmvscsi_host_partition_name, | |
2072 | &ibmvscsi_host_partition_number, | |
2073 | &ibmvscsi_host_mad_version, | |
2074 | &ibmvscsi_host_os_type, | |
2075 | &ibmvscsi_host_config, | |
2076 | NULL | |
2077 | }; | |
2078 | ||
2079 | /* ------------------------------------------------------------ | |
2080 | * SCSI driver registration | |
2081 | */ | |
2082 | static struct scsi_host_template driver_template = { | |
2083 | .module = THIS_MODULE, | |
2084 | .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION, | |
2085 | .proc_name = "ibmvscsi", | |
2086 | .queuecommand = ibmvscsi_queuecommand, | |
b6a05c82 | 2087 | .eh_timed_out = srp_timed_out, |
1da177e4 LT |
2088 | .eh_abort_handler = ibmvscsi_eh_abort_handler, |
2089 | .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler, | |
3d0e91f7 | 2090 | .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler, |
0979c84b | 2091 | .slave_configure = ibmvscsi_slave_configure, |
742d25b8 | 2092 | .change_queue_depth = ibmvscsi_change_queue_depth, |
2e225204 | 2093 | .host_reset = ibmvscsi_host_reset, |
7912a0ac | 2094 | .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT, |
a897ff2a | 2095 | .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT, |
1da177e4 | 2096 | .this_id = -1, |
4dddbc26 | 2097 | .sg_tablesize = SG_ALL, |
1da177e4 LT |
2098 | .shost_attrs = ibmvscsi_attrs, |
2099 | }; | |
2100 | ||
7912a0ac RJ |
2101 | /** |
2102 | * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver | |
2103 | * | |
2104 | * @vdev: struct vio_dev for the device whose desired IO mem is to be returned | |
2105 | * | |
2106 | * Return value: | |
2107 | * Number of bytes of IO data the driver will need to perform well. | |
2108 | */ | |
2109 | static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev) | |
2110 | { | |
2111 | /* iu_storage data allocated in initialize_event_pool */ | |
4f10aae0 | 2112 | unsigned long desired_io = max_events * sizeof(union viosrp_iu); |
7912a0ac RJ |
2113 | |
2114 | /* add io space for sg data */ | |
004dd5e8 | 2115 | desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 * |
7912a0ac RJ |
2116 | IBMVSCSI_CMDS_PER_LUN_DEFAULT); |
2117 | ||
2118 | return desired_io; | |
2119 | } | |
2120 | ||
0f33ece5 BK |
2121 | static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata) |
2122 | { | |
6e40de8b | 2123 | unsigned long flags; |
0f33ece5 BK |
2124 | int rc; |
2125 | char *action = "reset"; | |
2126 | ||
6e40de8b TD |
2127 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
2128 | switch (hostdata->action) { | |
aa343c69 | 2129 | case IBMVSCSI_HOST_ACTION_UNBLOCK: |
961ed94e | 2130 | rc = 0; |
6e40de8b TD |
2131 | break; |
2132 | case IBMVSCSI_HOST_ACTION_RESET: | |
2133 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
9965c2f1 | 2134 | rc = ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata); |
6e40de8b | 2135 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
0f33ece5 | 2136 | if (!rc) |
9965c2f1 | 2137 | rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0); |
201aed67 | 2138 | vio_enable_interrupts(to_vio_dev(hostdata->dev)); |
6e40de8b TD |
2139 | break; |
2140 | case IBMVSCSI_HOST_ACTION_REENABLE: | |
0f33ece5 | 2141 | action = "enable"; |
6e40de8b | 2142 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
9965c2f1 | 2143 | rc = ibmvscsi_reenable_crq_queue(&hostdata->queue, hostdata); |
6e40de8b | 2144 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
0f33ece5 | 2145 | if (!rc) |
9965c2f1 | 2146 | rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0); |
6e40de8b | 2147 | break; |
961ed94e | 2148 | case IBMVSCSI_HOST_ACTION_NONE: |
6e40de8b | 2149 | default: |
961ed94e | 2150 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
0f33ece5 | 2151 | return; |
6e40de8b TD |
2152 | } |
2153 | ||
2154 | hostdata->action = IBMVSCSI_HOST_ACTION_NONE; | |
665e0224 | 2155 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
0f33ece5 BK |
2156 | |
2157 | if (rc) { | |
665e0224 | 2158 | ibmvscsi_set_request_limit(hostdata, -1); |
0f33ece5 BK |
2159 | dev_err(hostdata->dev, "error after %s\n", action); |
2160 | } | |
2161 | ||
2162 | scsi_unblock_requests(hostdata->host); | |
2163 | } | |
2164 | ||
6e40de8b | 2165 | static int __ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata) |
0f33ece5 BK |
2166 | { |
2167 | if (kthread_should_stop()) | |
2168 | return 1; | |
6e40de8b TD |
2169 | switch (hostdata->action) { |
2170 | case IBMVSCSI_HOST_ACTION_NONE: | |
2171 | return 0; | |
2172 | case IBMVSCSI_HOST_ACTION_RESET: | |
2173 | case IBMVSCSI_HOST_ACTION_REENABLE: | |
aa343c69 | 2174 | case IBMVSCSI_HOST_ACTION_UNBLOCK: |
6e40de8b TD |
2175 | default: |
2176 | break; | |
0f33ece5 BK |
2177 | } |
2178 | ||
6e40de8b TD |
2179 | return 1; |
2180 | } | |
2181 | ||
2182 | static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata) | |
2183 | { | |
2184 | unsigned long flags; | |
2185 | int rc; | |
2186 | ||
2187 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
2188 | rc = __ibmvscsi_work_to_do(hostdata); | |
2189 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
2190 | ||
2191 | return rc; | |
0f33ece5 BK |
2192 | } |
2193 | ||
2194 | static int ibmvscsi_work(void *data) | |
2195 | { | |
2196 | struct ibmvscsi_host_data *hostdata = data; | |
2197 | int rc; | |
2198 | ||
8698a745 | 2199 | set_user_nice(current, MIN_NICE); |
0f33ece5 BK |
2200 | |
2201 | while (1) { | |
2202 | rc = wait_event_interruptible(hostdata->work_wait_q, | |
2203 | ibmvscsi_work_to_do(hostdata)); | |
2204 | ||
2205 | BUG_ON(rc); | |
2206 | ||
2207 | if (kthread_should_stop()) | |
2208 | break; | |
2209 | ||
2210 | ibmvscsi_do_work(hostdata); | |
2211 | } | |
2212 | ||
2213 | return 0; | |
2214 | } | |
2215 | ||
841d7df0 | 2216 | /* |
1da177e4 LT |
2217 | * Called by bus code for each adapter |
2218 | */ | |
2219 | static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id) | |
2220 | { | |
2221 | struct ibmvscsi_host_data *hostdata; | |
2222 | struct Scsi_Host *host; | |
2223 | struct device *dev = &vdev->dev; | |
4d680419 FT |
2224 | struct srp_rport_identifiers ids; |
2225 | struct srp_rport *rport; | |
1da177e4 | 2226 | unsigned long wait_switch = 0; |
cefbda2d | 2227 | int rc; |
1da177e4 | 2228 | |
559fde70 | 2229 | dev_set_drvdata(&vdev->dev, NULL); |
1da177e4 LT |
2230 | |
2231 | host = scsi_host_alloc(&driver_template, sizeof(*hostdata)); | |
2232 | if (!host) { | |
6c0a60ec | 2233 | dev_err(&vdev->dev, "couldn't allocate host data\n"); |
1da177e4 LT |
2234 | goto scsi_host_alloc_failed; |
2235 | } | |
2236 | ||
4d680419 | 2237 | host->transportt = ibmvscsi_transport_template; |
7603e02e | 2238 | hostdata = shost_priv(host); |
1da177e4 LT |
2239 | memset(hostdata, 0x00, sizeof(*hostdata)); |
2240 | INIT_LIST_HEAD(&hostdata->sent); | |
0f33ece5 | 2241 | init_waitqueue_head(&hostdata->work_wait_q); |
1da177e4 LT |
2242 | hostdata->host = host; |
2243 | hostdata->dev = dev; | |
665e0224 | 2244 | ibmvscsi_set_request_limit(hostdata, -1); |
7912a0ac | 2245 | hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT; |
1da177e4 | 2246 | |
126c5cc3 BK |
2247 | if (map_persist_bufs(hostdata)) { |
2248 | dev_err(&vdev->dev, "couldn't map persistent buffers\n"); | |
2249 | goto persist_bufs_failed; | |
2250 | } | |
2251 | ||
0f33ece5 BK |
2252 | hostdata->work_thread = kthread_run(ibmvscsi_work, hostdata, "%s_%d", |
2253 | "ibmvscsi", host->host_no); | |
2254 | ||
2255 | if (IS_ERR(hostdata->work_thread)) { | |
2256 | dev_err(&vdev->dev, "couldn't initialize kthread. rc=%ld\n", | |
2257 | PTR_ERR(hostdata->work_thread)); | |
2258 | goto init_crq_failed; | |
2259 | } | |
2260 | ||
9965c2f1 | 2261 | rc = ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, max_events); |
cefbda2d | 2262 | if (rc != 0 && rc != H_RESOURCE) { |
6c0a60ec | 2263 | dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc); |
0f33ece5 | 2264 | goto kill_kthread; |
1da177e4 | 2265 | } |
4f10aae0 | 2266 | if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) { |
6c0a60ec | 2267 | dev_err(&vdev->dev, "couldn't initialize event pool\n"); |
1da177e4 LT |
2268 | goto init_pool_failed; |
2269 | } | |
2270 | ||
3467a146 | 2271 | host->max_lun = IBMVSCSI_MAX_LUN; |
1da177e4 LT |
2272 | host->max_id = max_id; |
2273 | host->max_channel = max_channel; | |
fbc56f08 | 2274 | host->max_cmd_len = 16; |
1da177e4 | 2275 | |
e3678a0c LV |
2276 | dev_info(dev, |
2277 | "Maximum ID: %d Maximum LUN: %llu Maximum Channel: %d\n", | |
2278 | host->max_id, host->max_lun, host->max_channel); | |
2279 | ||
1da177e4 LT |
2280 | if (scsi_add_host(hostdata->host, hostdata->dev)) |
2281 | goto add_host_failed; | |
2282 | ||
4d680419 FT |
2283 | /* we don't have a proper target_port_id so let's use the fake one */ |
2284 | memcpy(ids.port_id, hostdata->madapter_info.partition_name, | |
2285 | sizeof(ids.port_id)); | |
aebd5e47 | 2286 | ids.roles = SRP_RPORT_ROLE_TARGET; |
4d680419 FT |
2287 | rport = srp_rport_add(host, &ids); |
2288 | if (IS_ERR(rport)) | |
2289 | goto add_srp_port_failed; | |
2290 | ||
1da177e4 LT |
2291 | /* Try to send an initialization message. Note that this is allowed |
2292 | * to fail if the other end is not acive. In that case we don't | |
2293 | * want to scan | |
2294 | */ | |
9965c2f1 | 2295 | if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0 |
cefbda2d | 2296 | || rc == H_RESOURCE) { |
1da177e4 LT |
2297 | /* |
2298 | * Wait around max init_timeout secs for the adapter to finish | |
2299 | * initializing. When we are done initializing, we will have a | |
2300 | * valid request_limit. We don't want Linux scanning before | |
2301 | * we are ready. | |
2302 | */ | |
2303 | for (wait_switch = jiffies + (init_timeout * HZ); | |
2304 | time_before(jiffies, wait_switch) && | |
2305 | atomic_read(&hostdata->request_limit) < 2;) { | |
2306 | ||
2307 | msleep(10); | |
2308 | } | |
2309 | ||
2310 | /* if we now have a valid request_limit, initiate a scan */ | |
2311 | if (atomic_read(&hostdata->request_limit) > 0) | |
2312 | scsi_scan_host(host); | |
2313 | } | |
2314 | ||
559fde70 | 2315 | dev_set_drvdata(&vdev->dev, hostdata); |
7205981e | 2316 | spin_lock(&ibmvscsi_driver_lock); |
32d6e4b6 | 2317 | list_add_tail(&hostdata->host_list, &ibmvscsi_head); |
7205981e | 2318 | spin_unlock(&ibmvscsi_driver_lock); |
1da177e4 LT |
2319 | return 0; |
2320 | ||
4d680419 FT |
2321 | add_srp_port_failed: |
2322 | scsi_remove_host(hostdata->host); | |
1da177e4 LT |
2323 | add_host_failed: |
2324 | release_event_pool(&hostdata->pool, hostdata); | |
2325 | init_pool_failed: | |
9965c2f1 | 2326 | ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_events); |
0f33ece5 BK |
2327 | kill_kthread: |
2328 | kthread_stop(hostdata->work_thread); | |
1da177e4 | 2329 | init_crq_failed: |
126c5cc3 BK |
2330 | unmap_persist_bufs(hostdata); |
2331 | persist_bufs_failed: | |
1da177e4 LT |
2332 | scsi_host_put(host); |
2333 | scsi_host_alloc_failed: | |
2334 | return -1; | |
2335 | } | |
2336 | ||
386a966f | 2337 | static void ibmvscsi_remove(struct vio_dev *vdev) |
1da177e4 | 2338 | { |
559fde70 | 2339 | struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev); |
7f5203c1 TD |
2340 | |
2341 | srp_remove_host(hostdata->host); | |
2342 | scsi_remove_host(hostdata->host); | |
2343 | ||
2344 | purge_requests(hostdata, DID_ERROR); | |
1da177e4 | 2345 | release_event_pool(&hostdata->pool, hostdata); |
7f5203c1 | 2346 | |
9965c2f1 | 2347 | ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, |
4f10aae0 | 2348 | max_events); |
4d680419 | 2349 | |
0f33ece5 | 2350 | kthread_stop(hostdata->work_thread); |
7f5203c1 TD |
2351 | unmap_persist_bufs(hostdata); |
2352 | ||
2353 | spin_lock(&ibmvscsi_driver_lock); | |
2354 | list_del(&hostdata->host_list); | |
2355 | spin_unlock(&ibmvscsi_driver_lock); | |
2356 | ||
1da177e4 | 2357 | scsi_host_put(hostdata->host); |
1da177e4 LT |
2358 | } |
2359 | ||
64355b92 BK |
2360 | /** |
2361 | * ibmvscsi_resume: Resume from suspend | |
2362 | * @dev: device struct | |
2363 | * | |
2364 | * We may have lost an interrupt across suspend/resume, so kick the | |
2365 | * interrupt handler | |
2366 | */ | |
2367 | static int ibmvscsi_resume(struct device *dev) | |
2368 | { | |
2369 | struct ibmvscsi_host_data *hostdata = dev_get_drvdata(dev); | |
9965c2f1 BH |
2370 | vio_disable_interrupts(to_vio_dev(hostdata->dev)); |
2371 | tasklet_schedule(&hostdata->srp_task); | |
2372 | ||
2373 | return 0; | |
64355b92 BK |
2374 | } |
2375 | ||
841d7df0 | 2376 | /* |
1da177e4 LT |
2377 | * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we |
2378 | * support. | |
2379 | */ | |
e4df3eaa | 2380 | static const struct vio_device_id ibmvscsi_device_table[] = { |
1da177e4 | 2381 | {"vscsi", "IBM,v-scsi"}, |
fb120da6 | 2382 | { "", "" } |
1da177e4 | 2383 | }; |
1da177e4 | 2384 | MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table); |
915124d8 | 2385 | |
e6b53a75 | 2386 | static const struct dev_pm_ops ibmvscsi_pm_ops = { |
64355b92 BK |
2387 | .resume = ibmvscsi_resume |
2388 | }; | |
2389 | ||
1da177e4 | 2390 | static struct vio_driver ibmvscsi_driver = { |
1da177e4 LT |
2391 | .id_table = ibmvscsi_device_table, |
2392 | .probe = ibmvscsi_probe, | |
6fdf5392 | 2393 | .remove = ibmvscsi_remove, |
7912a0ac | 2394 | .get_desired_dma = ibmvscsi_get_desired_dma, |
cb52d897 BH |
2395 | .name = "ibmvscsi", |
2396 | .pm = &ibmvscsi_pm_ops, | |
1da177e4 LT |
2397 | }; |
2398 | ||
4d680419 FT |
2399 | static struct srp_function_template ibmvscsi_transport_functions = { |
2400 | }; | |
2401 | ||
1f93ad17 | 2402 | static int __init ibmvscsi_module_init(void) |
1da177e4 | 2403 | { |
4d680419 FT |
2404 | int ret; |
2405 | ||
4f10aae0 BK |
2406 | /* Ensure we have two requests to do error recovery */ |
2407 | driver_template.can_queue = max_requests; | |
2408 | max_events = max_requests + 2; | |
2409 | ||
9965c2f1 | 2410 | if (!firmware_has_feature(FW_FEATURE_VIO)) |
d3849d51 DW |
2411 | return -ENODEV; |
2412 | ||
4d680419 FT |
2413 | ibmvscsi_transport_template = |
2414 | srp_attach_transport(&ibmvscsi_transport_functions); | |
2415 | if (!ibmvscsi_transport_template) | |
2416 | return -ENOMEM; | |
2417 | ||
2418 | ret = vio_register_driver(&ibmvscsi_driver); | |
2419 | if (ret) | |
2420 | srp_release_transport(ibmvscsi_transport_template); | |
2421 | return ret; | |
1da177e4 LT |
2422 | } |
2423 | ||
1f93ad17 | 2424 | static void __exit ibmvscsi_module_exit(void) |
1da177e4 LT |
2425 | { |
2426 | vio_unregister_driver(&ibmvscsi_driver); | |
4d680419 | 2427 | srp_release_transport(ibmvscsi_transport_template); |
1da177e4 LT |
2428 | } |
2429 | ||
2430 | module_init(ibmvscsi_module_init); | |
2431 | module_exit(ibmvscsi_module_exit); |