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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> | |
31 | #include <asm/iommu.h> | |
32 | #include <asm/hvcall.h> | |
33 | #include <linux/dma-mapping.h> | |
34 | #include <linux/interrupt.h> | |
35 | #include "ibmvscsi.h" | |
b4687ca4 LX |
36 | #include "srp.h" |
37 | ||
38 | static char partition_name[97] = "UNKNOWN"; | |
39 | static unsigned int partition_number = -1; | |
1da177e4 LT |
40 | |
41 | /* ------------------------------------------------------------ | |
42 | * Routines for managing the command/response queue | |
43 | */ | |
44 | /** | |
45 | * ibmvscsi_handle_event: - Interrupt handler for crq events | |
46 | * @irq: number of irq to handle, not used | |
47 | * @dev_instance: ibmvscsi_host_data of host that received interrupt | |
48 | * @regs: pt_regs with registers | |
49 | * | |
50 | * Disables interrupts and schedules srp_task | |
51 | * Always returns IRQ_HANDLED | |
52 | */ | |
53 | static irqreturn_t ibmvscsi_handle_event(int irq, | |
54 | void *dev_instance, | |
55 | struct pt_regs *regs) | |
56 | { | |
57 | struct ibmvscsi_host_data *hostdata = | |
58 | (struct ibmvscsi_host_data *)dev_instance; | |
59 | vio_disable_interrupts(to_vio_dev(hostdata->dev)); | |
60 | tasklet_schedule(&hostdata->srp_task); | |
61 | return IRQ_HANDLED; | |
62 | } | |
63 | ||
64 | /** | |
65 | * release_crq_queue: - Deallocates data and unregisters CRQ | |
66 | * @queue: crq_queue to initialize and register | |
67 | * @host_data: ibmvscsi_host_data of host | |
68 | * | |
69 | * Frees irq, deallocates a page for messages, unmaps dma, and unregisters | |
70 | * the crq with the hypervisor. | |
71 | */ | |
72 | void ibmvscsi_release_crq_queue(struct crq_queue *queue, | |
73 | struct ibmvscsi_host_data *hostdata, | |
74 | int max_requests) | |
75 | { | |
76 | long rc; | |
77 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
78 | free_irq(vdev->irq, (void *)hostdata); | |
79 | tasklet_kill(&hostdata->srp_task); | |
80 | do { | |
81 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); | |
82 | } while ((rc == H_Busy) || (H_isLongBusy(rc))); | |
83 | dma_unmap_single(hostdata->dev, | |
84 | queue->msg_token, | |
85 | queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL); | |
86 | free_page((unsigned long)queue->msgs); | |
87 | } | |
88 | ||
89 | /** | |
90 | * crq_queue_next_crq: - Returns the next entry in message queue | |
91 | * @queue: crq_queue to use | |
92 | * | |
93 | * Returns pointer to next entry in queue, or NULL if there are no new | |
94 | * entried in the CRQ. | |
95 | */ | |
96 | static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue) | |
97 | { | |
98 | struct viosrp_crq *crq; | |
99 | unsigned long flags; | |
100 | ||
101 | spin_lock_irqsave(&queue->lock, flags); | |
102 | crq = &queue->msgs[queue->cur]; | |
103 | if (crq->valid & 0x80) { | |
104 | if (++queue->cur == queue->size) | |
105 | queue->cur = 0; | |
106 | } else | |
107 | crq = NULL; | |
108 | spin_unlock_irqrestore(&queue->lock, flags); | |
109 | ||
110 | return crq; | |
111 | } | |
112 | ||
113 | /** | |
114 | * ibmvscsi_send_crq: - Send a CRQ | |
115 | * @hostdata: the adapter | |
116 | * @word1: the first 64 bits of the data | |
117 | * @word2: the second 64 bits of the data | |
118 | */ | |
119 | int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata, u64 word1, u64 word2) | |
120 | { | |
121 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
122 | ||
123 | return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2); | |
124 | } | |
125 | ||
126 | /** | |
127 | * ibmvscsi_task: - Process srps asynchronously | |
128 | * @data: ibmvscsi_host_data of host | |
129 | */ | |
130 | static void ibmvscsi_task(void *data) | |
131 | { | |
132 | struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data; | |
133 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
134 | struct viosrp_crq *crq; | |
135 | int done = 0; | |
136 | ||
137 | while (!done) { | |
138 | /* Pull all the valid messages off the CRQ */ | |
139 | while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) { | |
140 | ibmvscsi_handle_crq(crq, hostdata); | |
141 | crq->valid = 0x00; | |
142 | } | |
143 | ||
144 | vio_enable_interrupts(vdev); | |
145 | if ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) { | |
146 | vio_disable_interrupts(vdev); | |
147 | ibmvscsi_handle_crq(crq, hostdata); | |
148 | crq->valid = 0x00; | |
149 | } else { | |
150 | done = 1; | |
151 | } | |
152 | } | |
153 | } | |
154 | ||
b4687ca4 LX |
155 | static void gather_partition_info(void) |
156 | { | |
157 | struct device_node *rootdn; | |
158 | ||
159 | char *ppartition_name; | |
160 | unsigned int *p_number_ptr; | |
161 | ||
162 | /* Retrieve information about this partition */ | |
163 | rootdn = find_path_device("/"); | |
164 | if (!rootdn) { | |
165 | return; | |
166 | } | |
167 | ||
168 | ppartition_name = | |
169 | get_property(rootdn, "ibm,partition-name", NULL); | |
170 | if (ppartition_name) | |
171 | strncpy(partition_name, ppartition_name, | |
172 | sizeof(partition_name)); | |
173 | p_number_ptr = | |
174 | (unsigned int *)get_property(rootdn, "ibm,partition-no", | |
175 | NULL); | |
176 | if (p_number_ptr) | |
177 | partition_number = *p_number_ptr; | |
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 | ||
185 | printk(KERN_INFO "rpa_vscsi: SPR_VERSION: %s\n", SRP_VERSION); | |
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 | ||
1da177e4 LT |
197 | /** |
198 | * initialize_crq_queue: - Initializes and registers CRQ with hypervisor | |
199 | * @queue: crq_queue to initialize and register | |
200 | * @hostdata: ibmvscsi_host_data of host | |
201 | * | |
202 | * Allocates a page for messages, maps it for dma, and registers | |
203 | * the crq with the hypervisor. | |
204 | * Returns zero on success. | |
205 | */ | |
206 | int ibmvscsi_init_crq_queue(struct crq_queue *queue, | |
207 | struct ibmvscsi_host_data *hostdata, | |
208 | int max_requests) | |
209 | { | |
210 | int rc; | |
211 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
212 | ||
213 | queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL); | |
214 | ||
215 | if (!queue->msgs) | |
216 | goto malloc_failed; | |
217 | queue->size = PAGE_SIZE / sizeof(*queue->msgs); | |
218 | ||
219 | queue->msg_token = dma_map_single(hostdata->dev, queue->msgs, | |
220 | queue->size * sizeof(*queue->msgs), | |
221 | DMA_BIDIRECTIONAL); | |
222 | ||
223 | if (dma_mapping_error(queue->msg_token)) | |
224 | goto map_failed; | |
225 | ||
b4687ca4 LX |
226 | gather_partition_info(); |
227 | set_adapter_info(hostdata); | |
228 | ||
1da177e4 LT |
229 | rc = plpar_hcall_norets(H_REG_CRQ, |
230 | vdev->unit_address, | |
231 | queue->msg_token, PAGE_SIZE); | |
232 | if (rc == 2) { | |
233 | /* Adapter is good, but other end is not ready */ | |
234 | printk(KERN_WARNING "ibmvscsi: Partner adapter not ready\n"); | |
235 | } else if (rc != 0) { | |
236 | printk(KERN_WARNING "ibmvscsi: Error %d opening adapter\n", rc); | |
237 | goto reg_crq_failed; | |
238 | } | |
239 | ||
240 | if (request_irq(vdev->irq, | |
241 | ibmvscsi_handle_event, | |
242 | 0, "ibmvscsi", (void *)hostdata) != 0) { | |
243 | printk(KERN_ERR "ibmvscsi: couldn't register irq 0x%x\n", | |
244 | vdev->irq); | |
245 | goto req_irq_failed; | |
246 | } | |
247 | ||
248 | rc = vio_enable_interrupts(vdev); | |
249 | if (rc != 0) { | |
250 | printk(KERN_ERR "ibmvscsi: Error %d enabling interrupts!!!\n", | |
251 | rc); | |
252 | goto req_irq_failed; | |
253 | } | |
254 | ||
255 | queue->cur = 0; | |
256 | spin_lock_init(&queue->lock); | |
257 | ||
258 | tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task, | |
259 | (unsigned long)hostdata); | |
260 | ||
261 | return 0; | |
262 | ||
263 | req_irq_failed: | |
264 | do { | |
265 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); | |
266 | } while ((rc == H_Busy) || (H_isLongBusy(rc))); | |
267 | reg_crq_failed: | |
268 | dma_unmap_single(hostdata->dev, | |
269 | queue->msg_token, | |
270 | queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL); | |
271 | map_failed: | |
272 | free_page((unsigned long)queue->msgs); | |
273 | malloc_failed: | |
274 | return -1; | |
275 | } | |
276 | ||
277 | /** | |
278 | * reset_crq_queue: - resets a crq after a failure | |
279 | * @queue: crq_queue to initialize and register | |
280 | * @hostdata: ibmvscsi_host_data of host | |
281 | * | |
282 | */ | |
283 | void ibmvscsi_reset_crq_queue(struct crq_queue *queue, | |
284 | struct ibmvscsi_host_data *hostdata) | |
285 | { | |
286 | int rc; | |
287 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
288 | ||
289 | /* Close the CRQ */ | |
290 | do { | |
291 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); | |
292 | } while ((rc == H_Busy) || (H_isLongBusy(rc))); | |
293 | ||
294 | /* Clean out the queue */ | |
295 | memset(queue->msgs, 0x00, PAGE_SIZE); | |
296 | queue->cur = 0; | |
297 | ||
b4687ca4 LX |
298 | set_adapter_info(hostdata); |
299 | ||
1da177e4 LT |
300 | /* And re-open it again */ |
301 | rc = plpar_hcall_norets(H_REG_CRQ, | |
302 | vdev->unit_address, | |
303 | queue->msg_token, PAGE_SIZE); | |
304 | if (rc == 2) { | |
305 | /* Adapter is good, but other end is not ready */ | |
306 | printk(KERN_WARNING "ibmvscsi: Partner adapter not ready\n"); | |
307 | } else if (rc != 0) { | |
308 | printk(KERN_WARNING | |
309 | "ibmvscsi: couldn't register crq--rc 0x%x\n", rc); | |
310 | } | |
311 | } |