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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* ------------------------------------------------------------
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>
Stephen Rothwell71d276d2005-08-17 16:41:44 +100031#include <asm/prom.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <asm/iommu.h>
33#include <asm/hvcall.h>
34#include <linux/dma-mapping.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090035#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <linux/interrupt.h>
37#include "ibmvscsi.h"
Linda Xieb4687ca2005-06-27 17:01:48 -050038
39static char partition_name[97] = "UNKNOWN";
40static unsigned int partition_number = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
42/* ------------------------------------------------------------
43 * Routines for managing the command/response queue
44 */
45/**
David Woodhoused3849d52007-09-22 08:29:36 +100046 * rpavscsi_handle_event: - Interrupt handler for crq events
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 * @irq: number of irq to handle, not used
48 * @dev_instance: ibmvscsi_host_data of host that received interrupt
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 *
50 * Disables interrupts and schedules srp_task
51 * Always returns IRQ_HANDLED
52 */
David Woodhoused3849d52007-09-22 08:29:36 +100053static irqreturn_t rpavscsi_handle_event(int irq, void *dev_instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -070054{
55 struct ibmvscsi_host_data *hostdata =
56 (struct ibmvscsi_host_data *)dev_instance;
57 vio_disable_interrupts(to_vio_dev(hostdata->dev));
58 tasklet_schedule(&hostdata->srp_task);
59 return IRQ_HANDLED;
60}
61
62/**
63 * release_crq_queue: - Deallocates data and unregisters CRQ
64 * @queue: crq_queue to initialize and register
65 * @host_data: ibmvscsi_host_data of host
66 *
67 * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
68 * the crq with the hypervisor.
69 */
David Woodhoused3849d52007-09-22 08:29:36 +100070static void rpavscsi_release_crq_queue(struct crq_queue *queue,
71 struct ibmvscsi_host_data *hostdata,
72 int max_requests)
Linus Torvalds1da177e2005-04-16 15:20:36 -070073{
74 long rc;
75 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
76 free_irq(vdev->irq, (void *)hostdata);
77 tasklet_kill(&hostdata->srp_task);
78 do {
79 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
Segher Boessenkool706c8c92006-03-30 14:49:40 +020080 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 dma_unmap_single(hostdata->dev,
82 queue->msg_token,
83 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
84 free_page((unsigned long)queue->msgs);
85}
86
87/**
88 * crq_queue_next_crq: - Returns the next entry in message queue
89 * @queue: crq_queue to use
90 *
91 * Returns pointer to next entry in queue, or NULL if there are no new
92 * entried in the CRQ.
93 */
94static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue)
95{
96 struct viosrp_crq *crq;
97 unsigned long flags;
98
99 spin_lock_irqsave(&queue->lock, flags);
100 crq = &queue->msgs[queue->cur];
101 if (crq->valid & 0x80) {
102 if (++queue->cur == queue->size)
103 queue->cur = 0;
104 } else
105 crq = NULL;
106 spin_unlock_irqrestore(&queue->lock, flags);
107
108 return crq;
109}
110
111/**
David Woodhoused3849d52007-09-22 08:29:36 +1000112 * rpavscsi_send_crq: - Send a CRQ
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 * @hostdata: the adapter
114 * @word1: the first 64 bits of the data
115 * @word2: the second 64 bits of the data
116 */
David Woodhoused3849d52007-09-22 08:29:36 +1000117static int rpavscsi_send_crq(struct ibmvscsi_host_data *hostdata,
118 u64 word1, u64 word2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119{
120 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
121
122 return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
123}
124
125/**
David Woodhoused3849d52007-09-22 08:29:36 +1000126 * rpavscsi_task: - Process srps asynchronously
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 * @data: ibmvscsi_host_data of host
128 */
David Woodhoused3849d52007-09-22 08:29:36 +1000129static void rpavscsi_task(void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130{
131 struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data;
132 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
133 struct viosrp_crq *crq;
134 int done = 0;
135
136 while (!done) {
137 /* Pull all the valid messages off the CRQ */
138 while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) {
139 ibmvscsi_handle_crq(crq, hostdata);
140 crq->valid = 0x00;
141 }
142
143 vio_enable_interrupts(vdev);
144 if ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) {
145 vio_disable_interrupts(vdev);
146 ibmvscsi_handle_crq(crq, hostdata);
147 crq->valid = 0x00;
148 } else {
149 done = 1;
150 }
151 }
152}
153
Linda Xieb4687ca2005-06-27 17:01:48 -0500154static void gather_partition_info(void)
155{
156 struct device_node *rootdn;
157
Jeremy Kerr294ef162006-07-12 15:40:51 +1000158 const char *ppartition_name;
159 const unsigned int *p_number_ptr;
Linda Xieb4687ca2005-06-27 17:01:48 -0500160
161 /* Retrieve information about this partition */
Stephen Rothwell8c8dc322007-04-24 13:50:55 +1000162 rootdn = of_find_node_by_path("/");
Linda Xieb4687ca2005-06-27 17:01:48 -0500163 if (!rootdn) {
164 return;
165 }
166
Stephen Rothwell40cd3a42007-05-01 13:54:02 +1000167 ppartition_name = of_get_property(rootdn, "ibm,partition-name", NULL);
Linda Xieb4687ca2005-06-27 17:01:48 -0500168 if (ppartition_name)
169 strncpy(partition_name, ppartition_name,
170 sizeof(partition_name));
Stephen Rothwell40cd3a42007-05-01 13:54:02 +1000171 p_number_ptr = of_get_property(rootdn, "ibm,partition-no", NULL);
Linda Xieb4687ca2005-06-27 17:01:48 -0500172 if (p_number_ptr)
173 partition_number = *p_number_ptr;
Stephen Rothwell8c8dc322007-04-24 13:50:55 +1000174 of_node_put(rootdn);
Linda Xieb4687ca2005-06-27 17:01:48 -0500175}
176
177static void set_adapter_info(struct ibmvscsi_host_data *hostdata)
178{
179 memset(&hostdata->madapter_info, 0x00,
180 sizeof(hostdata->madapter_info));
181
Brian King6c0a60e2007-06-13 17:12:19 -0500182 dev_info(hostdata->dev, "SRP_VERSION: %s\n", SRP_VERSION);
Linda Xieb4687ca2005-06-27 17:01:48 -0500183 strcpy(hostdata->madapter_info.srp_version, SRP_VERSION);
184
185 strncpy(hostdata->madapter_info.partition_name, partition_name,
186 sizeof(hostdata->madapter_info.partition_name));
187
188 hostdata->madapter_info.partition_number = partition_number;
189
190 hostdata->madapter_info.mad_version = 1;
191 hostdata->madapter_info.os_type = 2;
192}
193
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 * reset_crq_queue: - resets a crq after a failure
196 * @queue: crq_queue to initialize and register
197 * @hostdata: ibmvscsi_host_data of host
198 *
199 */
David Woodhoused3849d52007-09-22 08:29:36 +1000200static int rpavscsi_reset_crq_queue(struct crq_queue *queue,
201 struct ibmvscsi_host_data *hostdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202{
203 int rc;
204 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
205
206 /* Close the CRQ */
207 do {
208 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
Segher Boessenkool706c8c92006-03-30 14:49:40 +0200209 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210
211 /* Clean out the queue */
212 memset(queue->msgs, 0x00, PAGE_SIZE);
213 queue->cur = 0;
214
Linda Xieb4687ca2005-06-27 17:01:48 -0500215 set_adapter_info(hostdata);
216
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 /* And re-open it again */
218 rc = plpar_hcall_norets(H_REG_CRQ,
219 vdev->unit_address,
220 queue->msg_token, PAGE_SIZE);
221 if (rc == 2) {
222 /* Adapter is good, but other end is not ready */
Brian King6c0a60e2007-06-13 17:12:19 -0500223 dev_warn(hostdata->dev, "Partner adapter not ready\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 } else if (rc != 0) {
Brian King6c0a60e2007-06-13 17:12:19 -0500225 dev_warn(hostdata->dev, "couldn't register crq--rc 0x%x\n", rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 }
Dave C Boutcherbb585962005-11-15 09:53:00 -0600227 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228}
David Woodhoused3849d52007-09-22 08:29:36 +1000229
230/**
231 * initialize_crq_queue: - Initializes and registers CRQ with hypervisor
232 * @queue: crq_queue to initialize and register
233 * @hostdata: ibmvscsi_host_data of host
234 *
235 * Allocates a page for messages, maps it for dma, and registers
236 * the crq with the hypervisor.
237 * Returns zero on success.
238 */
239static int rpavscsi_init_crq_queue(struct crq_queue *queue,
240 struct ibmvscsi_host_data *hostdata,
241 int max_requests)
242{
243 int rc;
244 int retrc;
245 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
246
247 queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL);
248
249 if (!queue->msgs)
250 goto malloc_failed;
251 queue->size = PAGE_SIZE / sizeof(*queue->msgs);
252
253 queue->msg_token = dma_map_single(hostdata->dev, queue->msgs,
254 queue->size * sizeof(*queue->msgs),
255 DMA_BIDIRECTIONAL);
256
FUJITA Tomonori8d8bb392008-07-25 19:44:49 -0700257 if (dma_mapping_error(hostdata->dev, queue->msg_token))
David Woodhoused3849d52007-09-22 08:29:36 +1000258 goto map_failed;
259
260 gather_partition_info();
261 set_adapter_info(hostdata);
262
263 retrc = rc = plpar_hcall_norets(H_REG_CRQ,
264 vdev->unit_address,
265 queue->msg_token, PAGE_SIZE);
266 if (rc == H_RESOURCE)
267 /* maybe kexecing and resource is busy. try a reset */
268 rc = rpavscsi_reset_crq_queue(queue,
269 hostdata);
270
271 if (rc == 2) {
272 /* Adapter is good, but other end is not ready */
273 dev_warn(hostdata->dev, "Partner adapter not ready\n");
274 retrc = 0;
275 } else if (rc != 0) {
276 dev_warn(hostdata->dev, "Error %d opening adapter\n", rc);
277 goto reg_crq_failed;
278 }
279
280 if (request_irq(vdev->irq,
281 rpavscsi_handle_event,
282 0, "ibmvscsi", (void *)hostdata) != 0) {
283 dev_err(hostdata->dev, "couldn't register irq 0x%x\n",
284 vdev->irq);
285 goto req_irq_failed;
286 }
287
288 rc = vio_enable_interrupts(vdev);
289 if (rc != 0) {
290 dev_err(hostdata->dev, "Error %d enabling interrupts!!!\n", rc);
291 goto req_irq_failed;
292 }
293
294 queue->cur = 0;
295 spin_lock_init(&queue->lock);
296
297 tasklet_init(&hostdata->srp_task, (void *)rpavscsi_task,
298 (unsigned long)hostdata);
299
300 return retrc;
301
302 req_irq_failed:
303 do {
304 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
305 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
306 reg_crq_failed:
307 dma_unmap_single(hostdata->dev,
308 queue->msg_token,
309 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
310 map_failed:
311 free_page((unsigned long)queue->msgs);
312 malloc_failed:
313 return -1;
314}
315
316/**
317 * reenable_crq_queue: - reenables a crq after
318 * @queue: crq_queue to initialize and register
319 * @hostdata: ibmvscsi_host_data of host
320 *
321 */
322static int rpavscsi_reenable_crq_queue(struct crq_queue *queue,
323 struct ibmvscsi_host_data *hostdata)
324{
325 int rc;
326 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
327
328 /* Re-enable the CRQ */
329 do {
330 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
331 } while ((rc == H_IN_PROGRESS) || (rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
332
333 if (rc)
334 dev_err(hostdata->dev, "Error %d enabling adapter\n", rc);
335 return rc;
336}
337
Brian King64355b92010-02-21 10:37:57 -0600338/**
339 * rpavscsi_resume: - resume after suspend
340 * @hostdata: ibmvscsi_host_data of host
341 *
342 */
343static int rpavscsi_resume(struct ibmvscsi_host_data *hostdata)
344{
345 vio_disable_interrupts(to_vio_dev(hostdata->dev));
346 tasklet_schedule(&hostdata->srp_task);
347 return 0;
348}
349
David Woodhoused3849d52007-09-22 08:29:36 +1000350struct ibmvscsi_ops rpavscsi_ops = {
351 .init_crq_queue = rpavscsi_init_crq_queue,
352 .release_crq_queue = rpavscsi_release_crq_queue,
353 .reset_crq_queue = rpavscsi_reset_crq_queue,
354 .reenable_crq_queue = rpavscsi_reenable_crq_queue,
355 .send_crq = rpavscsi_send_crq,
Brian King64355b92010-02-21 10:37:57 -0600356 .resume = rpavscsi_resume,
David Woodhoused3849d52007-09-22 08:29:36 +1000357};