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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> | |
34 | #include <linux/dma-mapping.h> | |
35 | #include <linux/interrupt.h> | |
36 | #include "ibmvscsi.h" | |
b4687ca4 LX |
37 | #include "srp.h" |
38 | ||
39 | static char partition_name[97] = "UNKNOWN"; | |
40 | static unsigned int partition_number = -1; | |
1da177e4 LT |
41 | |
42 | /* ------------------------------------------------------------ | |
43 | * Routines for managing the command/response queue | |
44 | */ | |
45 | /** | |
46 | * ibmvscsi_handle_event: - Interrupt handler for crq events | |
47 | * @irq: number of irq to handle, not used | |
48 | * @dev_instance: ibmvscsi_host_data of host that received interrupt | |
49 | * @regs: pt_regs with registers | |
50 | * | |
51 | * Disables interrupts and schedules srp_task | |
52 | * Always returns IRQ_HANDLED | |
53 | */ | |
54 | static irqreturn_t ibmvscsi_handle_event(int irq, | |
55 | void *dev_instance, | |
56 | struct pt_regs *regs) | |
57 | { | |
58 | struct ibmvscsi_host_data *hostdata = | |
59 | (struct ibmvscsi_host_data *)dev_instance; | |
60 | vio_disable_interrupts(to_vio_dev(hostdata->dev)); | |
61 | tasklet_schedule(&hostdata->srp_task); | |
62 | return IRQ_HANDLED; | |
63 | } | |
64 | ||
65 | /** | |
66 | * release_crq_queue: - Deallocates data and unregisters CRQ | |
67 | * @queue: crq_queue to initialize and register | |
68 | * @host_data: ibmvscsi_host_data of host | |
69 | * | |
70 | * Frees irq, deallocates a page for messages, unmaps dma, and unregisters | |
71 | * the crq with the hypervisor. | |
72 | */ | |
73 | void ibmvscsi_release_crq_queue(struct crq_queue *queue, | |
74 | struct ibmvscsi_host_data *hostdata, | |
75 | int max_requests) | |
76 | { | |
77 | long rc; | |
78 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
79 | free_irq(vdev->irq, (void *)hostdata); | |
80 | tasklet_kill(&hostdata->srp_task); | |
81 | do { | |
82 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); | |
83 | } while ((rc == H_Busy) || (H_isLongBusy(rc))); | |
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 | /** | |
115 | * ibmvscsi_send_crq: - Send a CRQ | |
116 | * @hostdata: the adapter | |
117 | * @word1: the first 64 bits of the data | |
118 | * @word2: the second 64 bits of the data | |
119 | */ | |
120 | int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata, u64 word1, u64 word2) | |
121 | { | |
122 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
123 | ||
124 | return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2); | |
125 | } | |
126 | ||
127 | /** | |
128 | * ibmvscsi_task: - Process srps asynchronously | |
129 | * @data: ibmvscsi_host_data of host | |
130 | */ | |
131 | static void ibmvscsi_task(void *data) | |
132 | { | |
133 | struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data; | |
134 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
135 | struct viosrp_crq *crq; | |
136 | int done = 0; | |
137 | ||
138 | while (!done) { | |
139 | /* Pull all the valid messages off the CRQ */ | |
140 | while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) { | |
141 | ibmvscsi_handle_crq(crq, hostdata); | |
142 | crq->valid = 0x00; | |
143 | } | |
144 | ||
145 | vio_enable_interrupts(vdev); | |
146 | if ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) { | |
147 | vio_disable_interrupts(vdev); | |
148 | ibmvscsi_handle_crq(crq, hostdata); | |
149 | crq->valid = 0x00; | |
150 | } else { | |
151 | done = 1; | |
152 | } | |
153 | } | |
154 | } | |
155 | ||
b4687ca4 LX |
156 | static void gather_partition_info(void) |
157 | { | |
158 | struct device_node *rootdn; | |
159 | ||
160 | char *ppartition_name; | |
161 | unsigned int *p_number_ptr; | |
162 | ||
163 | /* Retrieve information about this partition */ | |
164 | rootdn = find_path_device("/"); | |
165 | if (!rootdn) { | |
166 | return; | |
167 | } | |
168 | ||
169 | ppartition_name = | |
170 | get_property(rootdn, "ibm,partition-name", NULL); | |
171 | if (ppartition_name) | |
172 | strncpy(partition_name, ppartition_name, | |
173 | sizeof(partition_name)); | |
174 | p_number_ptr = | |
175 | (unsigned int *)get_property(rootdn, "ibm,partition-no", | |
176 | NULL); | |
177 | if (p_number_ptr) | |
178 | partition_number = *p_number_ptr; | |
179 | } | |
180 | ||
181 | static void set_adapter_info(struct ibmvscsi_host_data *hostdata) | |
182 | { | |
183 | memset(&hostdata->madapter_info, 0x00, | |
184 | sizeof(hostdata->madapter_info)); | |
185 | ||
186 | printk(KERN_INFO "rpa_vscsi: SPR_VERSION: %s\n", SRP_VERSION); | |
187 | strcpy(hostdata->madapter_info.srp_version, SRP_VERSION); | |
188 | ||
189 | strncpy(hostdata->madapter_info.partition_name, partition_name, | |
190 | sizeof(hostdata->madapter_info.partition_name)); | |
191 | ||
192 | hostdata->madapter_info.partition_number = partition_number; | |
193 | ||
194 | hostdata->madapter_info.mad_version = 1; | |
195 | hostdata->madapter_info.os_type = 2; | |
196 | } | |
197 | ||
1da177e4 LT |
198 | /** |
199 | * initialize_crq_queue: - Initializes and registers CRQ with hypervisor | |
200 | * @queue: crq_queue to initialize and register | |
201 | * @hostdata: ibmvscsi_host_data of host | |
202 | * | |
203 | * Allocates a page for messages, maps it for dma, and registers | |
204 | * the crq with the hypervisor. | |
205 | * Returns zero on success. | |
206 | */ | |
207 | int ibmvscsi_init_crq_queue(struct crq_queue *queue, | |
208 | struct ibmvscsi_host_data *hostdata, | |
209 | int max_requests) | |
210 | { | |
211 | int rc; | |
212 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
213 | ||
214 | queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL); | |
215 | ||
216 | if (!queue->msgs) | |
217 | goto malloc_failed; | |
218 | queue->size = PAGE_SIZE / sizeof(*queue->msgs); | |
219 | ||
220 | queue->msg_token = dma_map_single(hostdata->dev, queue->msgs, | |
221 | queue->size * sizeof(*queue->msgs), | |
222 | DMA_BIDIRECTIONAL); | |
223 | ||
224 | if (dma_mapping_error(queue->msg_token)) | |
225 | goto map_failed; | |
226 | ||
b4687ca4 LX |
227 | gather_partition_info(); |
228 | set_adapter_info(hostdata); | |
229 | ||
1da177e4 LT |
230 | rc = plpar_hcall_norets(H_REG_CRQ, |
231 | vdev->unit_address, | |
232 | queue->msg_token, PAGE_SIZE); | |
233 | if (rc == 2) { | |
234 | /* Adapter is good, but other end is not ready */ | |
235 | printk(KERN_WARNING "ibmvscsi: Partner adapter not ready\n"); | |
236 | } else if (rc != 0) { | |
237 | printk(KERN_WARNING "ibmvscsi: Error %d opening adapter\n", rc); | |
238 | goto reg_crq_failed; | |
239 | } | |
240 | ||
241 | if (request_irq(vdev->irq, | |
242 | ibmvscsi_handle_event, | |
243 | 0, "ibmvscsi", (void *)hostdata) != 0) { | |
244 | printk(KERN_ERR "ibmvscsi: couldn't register irq 0x%x\n", | |
245 | vdev->irq); | |
246 | goto req_irq_failed; | |
247 | } | |
248 | ||
249 | rc = vio_enable_interrupts(vdev); | |
250 | if (rc != 0) { | |
251 | printk(KERN_ERR "ibmvscsi: Error %d enabling interrupts!!!\n", | |
252 | rc); | |
253 | goto req_irq_failed; | |
254 | } | |
255 | ||
256 | queue->cur = 0; | |
257 | spin_lock_init(&queue->lock); | |
258 | ||
259 | tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task, | |
260 | (unsigned long)hostdata); | |
261 | ||
262 | return 0; | |
263 | ||
264 | req_irq_failed: | |
265 | do { | |
266 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); | |
267 | } while ((rc == H_Busy) || (H_isLongBusy(rc))); | |
268 | reg_crq_failed: | |
269 | dma_unmap_single(hostdata->dev, | |
270 | queue->msg_token, | |
271 | queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL); | |
272 | map_failed: | |
273 | free_page((unsigned long)queue->msgs); | |
274 | malloc_failed: | |
275 | return -1; | |
276 | } | |
277 | ||
278 | /** | |
279 | * reset_crq_queue: - resets a crq after a failure | |
280 | * @queue: crq_queue to initialize and register | |
281 | * @hostdata: ibmvscsi_host_data of host | |
282 | * | |
283 | */ | |
284 | void ibmvscsi_reset_crq_queue(struct crq_queue *queue, | |
285 | struct ibmvscsi_host_data *hostdata) | |
286 | { | |
287 | int rc; | |
288 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
289 | ||
290 | /* Close the CRQ */ | |
291 | do { | |
292 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); | |
293 | } while ((rc == H_Busy) || (H_isLongBusy(rc))); | |
294 | ||
295 | /* Clean out the queue */ | |
296 | memset(queue->msgs, 0x00, PAGE_SIZE); | |
297 | queue->cur = 0; | |
298 | ||
b4687ca4 LX |
299 | set_adapter_info(hostdata); |
300 | ||
1da177e4 LT |
301 | /* And re-open it again */ |
302 | rc = plpar_hcall_norets(H_REG_CRQ, | |
303 | vdev->unit_address, | |
304 | queue->msg_token, PAGE_SIZE); | |
305 | if (rc == 2) { | |
306 | /* Adapter is good, but other end is not ready */ | |
307 | printk(KERN_WARNING "ibmvscsi: Partner adapter not ready\n"); | |
308 | } else if (rc != 0) { | |
309 | printk(KERN_WARNING | |
310 | "ibmvscsi: couldn't register crq--rc 0x%x\n", rc); | |
311 | } | |
312 | } |