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1da177e4 LT |
1 | /* ------------------------------------------------------------ |
2 | * rpa_vscsi.c | |
3 | * (C) Copyright IBM Corporation 1994, 2003 | |
4 | * Authors: Colin DeVilbiss (devilbis@us.ibm.com) | |
5 | * Santiago Leon (santil@us.ibm.com) | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
20 | * USA | |
21 | * | |
22 | * ------------------------------------------------------------ | |
23 | * RPA-specific functions of the SCSI host adapter for Virtual I/O devices | |
24 | * | |
25 | * This driver allows the Linux SCSI peripheral drivers to directly | |
26 | * access devices in the hosting partition, either on an iSeries | |
27 | * hypervisor system or a converged hypervisor system. | |
28 | */ | |
29 | ||
30 | #include <asm/vio.h> | |
71d276d7 | 31 | #include <asm/prom.h> |
1da177e4 LT |
32 | #include <asm/iommu.h> |
33 | #include <asm/hvcall.h> | |
0f33ece5 | 34 | #include <linux/delay.h> |
1da177e4 | 35 | #include <linux/dma-mapping.h> |
5a0e3ad6 | 36 | #include <linux/gfp.h> |
1da177e4 LT |
37 | #include <linux/interrupt.h> |
38 | #include "ibmvscsi.h" | |
b4687ca4 LX |
39 | |
40 | static char partition_name[97] = "UNKNOWN"; | |
41 | static unsigned int partition_number = -1; | |
1da177e4 LT |
42 | |
43 | /* ------------------------------------------------------------ | |
44 | * Routines for managing the command/response queue | |
45 | */ | |
46 | /** | |
d3849d51 | 47 | * rpavscsi_handle_event: - Interrupt handler for crq events |
1da177e4 LT |
48 | * @irq: number of irq to handle, not used |
49 | * @dev_instance: ibmvscsi_host_data of host that received interrupt | |
1da177e4 LT |
50 | * |
51 | * Disables interrupts and schedules srp_task | |
52 | * Always returns IRQ_HANDLED | |
53 | */ | |
d3849d51 | 54 | static irqreturn_t rpavscsi_handle_event(int irq, void *dev_instance) |
1da177e4 LT |
55 | { |
56 | struct ibmvscsi_host_data *hostdata = | |
57 | (struct ibmvscsi_host_data *)dev_instance; | |
58 | vio_disable_interrupts(to_vio_dev(hostdata->dev)); | |
59 | tasklet_schedule(&hostdata->srp_task); | |
60 | return IRQ_HANDLED; | |
61 | } | |
62 | ||
63 | /** | |
64 | * release_crq_queue: - Deallocates data and unregisters CRQ | |
65 | * @queue: crq_queue to initialize and register | |
66 | * @host_data: ibmvscsi_host_data of host | |
67 | * | |
68 | * Frees irq, deallocates a page for messages, unmaps dma, and unregisters | |
69 | * the crq with the hypervisor. | |
70 | */ | |
d3849d51 DW |
71 | static void rpavscsi_release_crq_queue(struct crq_queue *queue, |
72 | struct ibmvscsi_host_data *hostdata, | |
73 | int max_requests) | |
1da177e4 | 74 | { |
0f33ece5 | 75 | long rc = 0; |
1da177e4 LT |
76 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); |
77 | free_irq(vdev->irq, (void *)hostdata); | |
78 | tasklet_kill(&hostdata->srp_task); | |
79 | do { | |
0f33ece5 BK |
80 | if (rc) |
81 | msleep(100); | |
1da177e4 | 82 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); |
706c8c93 | 83 | } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); |
1da177e4 LT |
84 | dma_unmap_single(hostdata->dev, |
85 | queue->msg_token, | |
86 | queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL); | |
87 | free_page((unsigned long)queue->msgs); | |
88 | } | |
89 | ||
90 | /** | |
91 | * crq_queue_next_crq: - Returns the next entry in message queue | |
92 | * @queue: crq_queue to use | |
93 | * | |
94 | * Returns pointer to next entry in queue, or NULL if there are no new | |
95 | * entried in the CRQ. | |
96 | */ | |
97 | static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue) | |
98 | { | |
99 | struct viosrp_crq *crq; | |
100 | unsigned long flags; | |
101 | ||
102 | spin_lock_irqsave(&queue->lock, flags); | |
103 | crq = &queue->msgs[queue->cur]; | |
104 | if (crq->valid & 0x80) { | |
105 | if (++queue->cur == queue->size) | |
106 | queue->cur = 0; | |
107 | } else | |
108 | crq = NULL; | |
109 | spin_unlock_irqrestore(&queue->lock, flags); | |
110 | ||
111 | return crq; | |
112 | } | |
113 | ||
114 | /** | |
d3849d51 | 115 | * rpavscsi_send_crq: - Send a CRQ |
1da177e4 LT |
116 | * @hostdata: the adapter |
117 | * @word1: the first 64 bits of the data | |
118 | * @word2: the second 64 bits of the data | |
119 | */ | |
d3849d51 DW |
120 | static int rpavscsi_send_crq(struct ibmvscsi_host_data *hostdata, |
121 | u64 word1, u64 word2) | |
1da177e4 LT |
122 | { |
123 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
124 | ||
125 | return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2); | |
126 | } | |
127 | ||
128 | /** | |
d3849d51 | 129 | * rpavscsi_task: - Process srps asynchronously |
1da177e4 LT |
130 | * @data: ibmvscsi_host_data of host |
131 | */ | |
d3849d51 | 132 | static void rpavscsi_task(void *data) |
1da177e4 LT |
133 | { |
134 | struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data; | |
135 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
136 | struct viosrp_crq *crq; | |
137 | int done = 0; | |
138 | ||
139 | while (!done) { | |
140 | /* Pull all the valid messages off the CRQ */ | |
141 | while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) { | |
142 | ibmvscsi_handle_crq(crq, hostdata); | |
143 | crq->valid = 0x00; | |
144 | } | |
145 | ||
146 | vio_enable_interrupts(vdev); | |
147 | if ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) { | |
148 | vio_disable_interrupts(vdev); | |
149 | ibmvscsi_handle_crq(crq, hostdata); | |
150 | crq->valid = 0x00; | |
151 | } else { | |
152 | done = 1; | |
153 | } | |
154 | } | |
155 | } | |
156 | ||
b4687ca4 LX |
157 | static void gather_partition_info(void) |
158 | { | |
159 | struct device_node *rootdn; | |
160 | ||
294ef16a JK |
161 | const char *ppartition_name; |
162 | const unsigned int *p_number_ptr; | |
b4687ca4 LX |
163 | |
164 | /* Retrieve information about this partition */ | |
8c8dc322 | 165 | rootdn = of_find_node_by_path("/"); |
b4687ca4 LX |
166 | if (!rootdn) { |
167 | return; | |
168 | } | |
169 | ||
40cd3a45 | 170 | ppartition_name = of_get_property(rootdn, "ibm,partition-name", NULL); |
b4687ca4 LX |
171 | if (ppartition_name) |
172 | strncpy(partition_name, ppartition_name, | |
173 | sizeof(partition_name)); | |
40cd3a45 | 174 | p_number_ptr = of_get_property(rootdn, "ibm,partition-no", NULL); |
b4687ca4 LX |
175 | if (p_number_ptr) |
176 | partition_number = *p_number_ptr; | |
8c8dc322 | 177 | of_node_put(rootdn); |
b4687ca4 LX |
178 | } |
179 | ||
180 | static void set_adapter_info(struct ibmvscsi_host_data *hostdata) | |
181 | { | |
182 | memset(&hostdata->madapter_info, 0x00, | |
183 | sizeof(hostdata->madapter_info)); | |
184 | ||
6c0a60ec | 185 | dev_info(hostdata->dev, "SRP_VERSION: %s\n", SRP_VERSION); |
b4687ca4 LX |
186 | strcpy(hostdata->madapter_info.srp_version, SRP_VERSION); |
187 | ||
188 | strncpy(hostdata->madapter_info.partition_name, partition_name, | |
189 | sizeof(hostdata->madapter_info.partition_name)); | |
190 | ||
191 | hostdata->madapter_info.partition_number = partition_number; | |
192 | ||
193 | hostdata->madapter_info.mad_version = 1; | |
194 | hostdata->madapter_info.os_type = 2; | |
195 | } | |
196 | ||
d3849d51 DW |
197 | /** |
198 | * reset_crq_queue: - resets a crq after a failure | |
199 | * @queue: crq_queue to initialize and register | |
200 | * @hostdata: ibmvscsi_host_data of host | |
201 | * | |
202 | */ | |
203 | static int rpavscsi_reset_crq_queue(struct crq_queue *queue, | |
204 | struct ibmvscsi_host_data *hostdata) | |
205 | { | |
0f33ece5 | 206 | int rc = 0; |
d3849d51 DW |
207 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); |
208 | ||
209 | /* Close the CRQ */ | |
210 | do { | |
0f33ece5 BK |
211 | if (rc) |
212 | msleep(100); | |
d3849d51 DW |
213 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); |
214 | } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); | |
215 | ||
216 | /* Clean out the queue */ | |
217 | memset(queue->msgs, 0x00, PAGE_SIZE); | |
218 | queue->cur = 0; | |
219 | ||
220 | set_adapter_info(hostdata); | |
221 | ||
222 | /* And re-open it again */ | |
223 | rc = plpar_hcall_norets(H_REG_CRQ, | |
224 | vdev->unit_address, | |
225 | queue->msg_token, PAGE_SIZE); | |
226 | if (rc == 2) { | |
227 | /* Adapter is good, but other end is not ready */ | |
228 | dev_warn(hostdata->dev, "Partner adapter not ready\n"); | |
229 | } else if (rc != 0) { | |
230 | dev_warn(hostdata->dev, "couldn't register crq--rc 0x%x\n", rc); | |
231 | } | |
232 | return rc; | |
233 | } | |
234 | ||
1da177e4 LT |
235 | /** |
236 | * initialize_crq_queue: - Initializes and registers CRQ with hypervisor | |
237 | * @queue: crq_queue to initialize and register | |
238 | * @hostdata: ibmvscsi_host_data of host | |
239 | * | |
240 | * Allocates a page for messages, maps it for dma, and registers | |
241 | * the crq with the hypervisor. | |
242 | * Returns zero on success. | |
243 | */ | |
d3849d51 DW |
244 | static int rpavscsi_init_crq_queue(struct crq_queue *queue, |
245 | struct ibmvscsi_host_data *hostdata, | |
246 | int max_requests) | |
1da177e4 LT |
247 | { |
248 | int rc; | |
cefbda2d | 249 | int retrc; |
1da177e4 LT |
250 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); |
251 | ||
252 | queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL); | |
253 | ||
254 | if (!queue->msgs) | |
255 | goto malloc_failed; | |
256 | queue->size = PAGE_SIZE / sizeof(*queue->msgs); | |
257 | ||
258 | queue->msg_token = dma_map_single(hostdata->dev, queue->msgs, | |
259 | queue->size * sizeof(*queue->msgs), | |
260 | DMA_BIDIRECTIONAL); | |
261 | ||
8d8bb39b | 262 | if (dma_mapping_error(hostdata->dev, queue->msg_token)) |
1da177e4 LT |
263 | goto map_failed; |
264 | ||
b4687ca4 LX |
265 | gather_partition_info(); |
266 | set_adapter_info(hostdata); | |
267 | ||
cefbda2d | 268 | retrc = rc = plpar_hcall_norets(H_REG_CRQ, |
1da177e4 LT |
269 | vdev->unit_address, |
270 | queue->msg_token, PAGE_SIZE); | |
706c8c93 | 271 | if (rc == H_RESOURCE) |
bb58596f | 272 | /* maybe kexecing and resource is busy. try a reset */ |
d3849d51 | 273 | rc = rpavscsi_reset_crq_queue(queue, |
bb58596f DB |
274 | hostdata); |
275 | ||
1da177e4 LT |
276 | if (rc == 2) { |
277 | /* Adapter is good, but other end is not ready */ | |
6c0a60ec | 278 | dev_warn(hostdata->dev, "Partner adapter not ready\n"); |
ae0fda0c | 279 | retrc = 0; |
1da177e4 | 280 | } else if (rc != 0) { |
6c0a60ec | 281 | dev_warn(hostdata->dev, "Error %d opening adapter\n", rc); |
1da177e4 LT |
282 | goto reg_crq_failed; |
283 | } | |
284 | ||
8f83d768 AB |
285 | queue->cur = 0; |
286 | spin_lock_init(&queue->lock); | |
287 | ||
288 | tasklet_init(&hostdata->srp_task, (void *)rpavscsi_task, | |
289 | (unsigned long)hostdata); | |
290 | ||
1da177e4 | 291 | if (request_irq(vdev->irq, |
d3849d51 | 292 | rpavscsi_handle_event, |
1da177e4 | 293 | 0, "ibmvscsi", (void *)hostdata) != 0) { |
6c0a60ec BK |
294 | dev_err(hostdata->dev, "couldn't register irq 0x%x\n", |
295 | vdev->irq); | |
1da177e4 LT |
296 | goto req_irq_failed; |
297 | } | |
298 | ||
299 | rc = vio_enable_interrupts(vdev); | |
300 | if (rc != 0) { | |
6c0a60ec | 301 | dev_err(hostdata->dev, "Error %d enabling interrupts!!!\n", rc); |
1da177e4 LT |
302 | goto req_irq_failed; |
303 | } | |
304 | ||
cefbda2d | 305 | return retrc; |
1da177e4 LT |
306 | |
307 | req_irq_failed: | |
8f83d768 | 308 | tasklet_kill(&hostdata->srp_task); |
0f33ece5 | 309 | rc = 0; |
1da177e4 | 310 | do { |
0f33ece5 BK |
311 | if (rc) |
312 | msleep(100); | |
1da177e4 | 313 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); |
706c8c93 | 314 | } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); |
1da177e4 LT |
315 | reg_crq_failed: |
316 | dma_unmap_single(hostdata->dev, | |
317 | queue->msg_token, | |
318 | queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL); | |
319 | map_failed: | |
320 | free_page((unsigned long)queue->msgs); | |
321 | malloc_failed: | |
322 | return -1; | |
323 | } | |
324 | ||
2b541f8f DB |
325 | /** |
326 | * reenable_crq_queue: - reenables a crq after | |
327 | * @queue: crq_queue to initialize and register | |
328 | * @hostdata: ibmvscsi_host_data of host | |
329 | * | |
330 | */ | |
d3849d51 DW |
331 | static int rpavscsi_reenable_crq_queue(struct crq_queue *queue, |
332 | struct ibmvscsi_host_data *hostdata) | |
2b541f8f | 333 | { |
0f33ece5 | 334 | int rc = 0; |
2b541f8f DB |
335 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); |
336 | ||
337 | /* Re-enable the CRQ */ | |
338 | do { | |
0f33ece5 BK |
339 | if (rc) |
340 | msleep(100); | |
2b541f8f | 341 | rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address); |
706c8c93 | 342 | } while ((rc == H_IN_PROGRESS) || (rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); |
2b541f8f DB |
343 | |
344 | if (rc) | |
6c0a60ec | 345 | dev_err(hostdata->dev, "Error %d enabling adapter\n", rc); |
2b541f8f DB |
346 | return rc; |
347 | } | |
348 | ||
64355b92 BK |
349 | /** |
350 | * rpavscsi_resume: - resume after suspend | |
351 | * @hostdata: ibmvscsi_host_data of host | |
352 | * | |
353 | */ | |
354 | static int rpavscsi_resume(struct ibmvscsi_host_data *hostdata) | |
355 | { | |
356 | vio_disable_interrupts(to_vio_dev(hostdata->dev)); | |
357 | tasklet_schedule(&hostdata->srp_task); | |
358 | return 0; | |
359 | } | |
360 | ||
d3849d51 DW |
361 | struct ibmvscsi_ops rpavscsi_ops = { |
362 | .init_crq_queue = rpavscsi_init_crq_queue, | |
363 | .release_crq_queue = rpavscsi_release_crq_queue, | |
364 | .reset_crq_queue = rpavscsi_reset_crq_queue, | |
365 | .reenable_crq_queue = rpavscsi_reenable_crq_queue, | |
366 | .send_crq = rpavscsi_send_crq, | |
64355b92 | 367 | .resume = rpavscsi_resume, |
d3849d51 | 368 | }; |