Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
00bab910 | 2 | * zfcp device driver |
1da177e4 | 3 | * |
00bab910 | 4 | * Setup and helper functions to access QDIO. |
1da177e4 | 5 | * |
00bab910 | 6 | * Copyright IBM Corporation 2002, 2008 |
1da177e4 LT |
7 | */ |
8 | ||
ecf39d42 CS |
9 | #define KMSG_COMPONENT "zfcp" |
10 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
11 | ||
1da177e4 LT |
12 | #include "zfcp_ext.h" |
13 | ||
00bab910 SS |
14 | /* FIXME(tune): free space should be one max. SBAL chain plus what? */ |
15 | #define ZFCP_QDIO_PCI_INTERVAL (QDIO_MAX_BUFFERS_PER_Q \ | |
c41f8cbd | 16 | - (FSF_MAX_SBALS_PER_REQ + 4)) |
5d4e2262 | 17 | #define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer)) |
1da177e4 | 18 | |
00bab910 | 19 | static int zfcp_qdio_buffers_enqueue(struct qdio_buffer **sbal) |
1da177e4 | 20 | { |
b4e44590 | 21 | int pos; |
1da177e4 | 22 | |
b4e44590 | 23 | for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos += QBUFF_PER_PAGE) { |
00bab910 SS |
24 | sbal[pos] = (struct qdio_buffer *) get_zeroed_page(GFP_KERNEL); |
25 | if (!sbal[pos]) | |
b4e44590 | 26 | return -ENOMEM; |
b4e44590 SS |
27 | } |
28 | for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos++) | |
29 | if (pos % QBUFF_PER_PAGE) | |
00bab910 | 30 | sbal[pos] = sbal[pos - 1] + 1; |
b4e44590 | 31 | return 0; |
1da177e4 LT |
32 | } |
33 | ||
44cc76f2 | 34 | static struct qdio_buffer_element * |
00bab910 | 35 | zfcp_qdio_sbale(struct zfcp_qdio_queue *q, int sbal_idx, int sbale_idx) |
1da177e4 | 36 | { |
00bab910 | 37 | return &q->sbal[sbal_idx]->element[sbale_idx]; |
1da177e4 LT |
38 | } |
39 | ||
00bab910 SS |
40 | /** |
41 | * zfcp_qdio_free - free memory used by request- and resposne queue | |
42 | * @adapter: pointer to the zfcp_adapter structure | |
43 | */ | |
44 | void zfcp_qdio_free(struct zfcp_adapter *adapter) | |
1da177e4 | 45 | { |
00bab910 SS |
46 | struct qdio_buffer **sbal_req, **sbal_resp; |
47 | int p; | |
1da177e4 | 48 | |
00bab910 SS |
49 | if (adapter->ccw_device) |
50 | qdio_free(adapter->ccw_device); | |
1da177e4 | 51 | |
00bab910 SS |
52 | sbal_req = adapter->req_q.sbal; |
53 | sbal_resp = adapter->resp_q.sbal; | |
1da177e4 | 54 | |
00bab910 SS |
55 | for (p = 0; p < QDIO_MAX_BUFFERS_PER_Q; p += QBUFF_PER_PAGE) { |
56 | free_page((unsigned long) sbal_req[p]); | |
57 | free_page((unsigned long) sbal_resp[p]); | |
58 | } | |
1da177e4 LT |
59 | } |
60 | ||
00bab910 | 61 | static void zfcp_qdio_handler_error(struct zfcp_adapter *adapter, u8 id) |
1da177e4 | 62 | { |
ff3b24fa | 63 | dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n"); |
1da177e4 | 64 | |
00bab910 SS |
65 | zfcp_erp_adapter_reopen(adapter, |
66 | ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED | | |
67 | ZFCP_STATUS_COMMON_ERP_FAILED, id, NULL); | |
1da177e4 LT |
68 | } |
69 | ||
5d4e2262 CS |
70 | static void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int cnt) |
71 | { | |
72 | int i, sbal_idx; | |
73 | ||
74 | for (i = first; i < first + cnt; i++) { | |
75 | sbal_idx = i % QDIO_MAX_BUFFERS_PER_Q; | |
76 | memset(sbal[sbal_idx], 0, sizeof(struct qdio_buffer)); | |
77 | } | |
78 | } | |
79 | ||
779e6e1c JG |
80 | static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err, |
81 | int queue_no, int first, int count, | |
00bab910 | 82 | unsigned long parm) |
1da177e4 | 83 | { |
00bab910 SS |
84 | struct zfcp_adapter *adapter = (struct zfcp_adapter *) parm; |
85 | struct zfcp_qdio_queue *queue = &adapter->req_q; | |
1da177e4 | 86 | |
779e6e1c JG |
87 | if (unlikely(qdio_err)) { |
88 | zfcp_hba_dbf_event_qdio(adapter, qdio_err, first, count); | |
00bab910 SS |
89 | zfcp_qdio_handler_error(adapter, 140); |
90 | return; | |
91 | } | |
1da177e4 LT |
92 | |
93 | /* cleanup all SBALs being program-owned now */ | |
00bab910 | 94 | zfcp_qdio_zero_sbals(queue->sbal, first, count); |
1da177e4 | 95 | |
00bab910 | 96 | atomic_add(count, &queue->count); |
1da177e4 | 97 | wake_up(&adapter->request_wq); |
1da177e4 LT |
98 | } |
99 | ||
b03670e5 | 100 | static void zfcp_qdio_reqid_check(struct zfcp_adapter *adapter, |
00bab910 | 101 | unsigned long req_id, int sbal_idx) |
fea9d6c7 VS |
102 | { |
103 | struct zfcp_fsf_req *fsf_req; | |
104 | unsigned long flags; | |
105 | ||
fea9d6c7 | 106 | spin_lock_irqsave(&adapter->req_list_lock, flags); |
ca2d02c2 | 107 | fsf_req = zfcp_reqlist_find(adapter, req_id); |
fea9d6c7 | 108 | |
ca2d02c2 HC |
109 | if (!fsf_req) |
110 | /* | |
111 | * Unknown request means that we have potentially memory | |
112 | * corruption and must stop the machine immediatly. | |
113 | */ | |
00bab910 | 114 | panic("error: unknown request id (%lx) on adapter %s.\n", |
ca2d02c2 | 115 | req_id, zfcp_get_busid_by_adapter(adapter)); |
fea9d6c7 | 116 | |
ca2d02c2 | 117 | zfcp_reqlist_remove(adapter, fsf_req); |
fea9d6c7 VS |
118 | spin_unlock_irqrestore(&adapter->req_list_lock, flags); |
119 | ||
00bab910 | 120 | fsf_req->sbal_response = sbal_idx; |
0997f1c5 | 121 | fsf_req->qdio_inb_usage = atomic_read(&adapter->resp_q.count); |
fea9d6c7 | 122 | zfcp_fsf_req_complete(fsf_req); |
fea9d6c7 VS |
123 | } |
124 | ||
00bab910 | 125 | static void zfcp_qdio_resp_put_back(struct zfcp_adapter *adapter, int processed) |
1da177e4 | 126 | { |
00bab910 SS |
127 | struct zfcp_qdio_queue *queue = &adapter->resp_q; |
128 | struct ccw_device *cdev = adapter->ccw_device; | |
129 | u8 count, start = queue->first; | |
130 | unsigned int retval; | |
1da177e4 | 131 | |
00bab910 SS |
132 | count = atomic_read(&queue->count) + processed; |
133 | ||
779e6e1c | 134 | retval = do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, start, count); |
00bab910 SS |
135 | |
136 | if (unlikely(retval)) { | |
137 | atomic_set(&queue->count, count); | |
138 | /* FIXME: Recover this with an adapter reopen? */ | |
139 | } else { | |
140 | queue->first += count; | |
141 | queue->first %= QDIO_MAX_BUFFERS_PER_Q; | |
142 | atomic_set(&queue->count, 0); | |
143 | } | |
144 | } | |
145 | ||
779e6e1c JG |
146 | static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err, |
147 | int queue_no, int first, int count, | |
00bab910 SS |
148 | unsigned long parm) |
149 | { | |
150 | struct zfcp_adapter *adapter = (struct zfcp_adapter *) parm; | |
151 | struct zfcp_qdio_queue *queue = &adapter->resp_q; | |
44cc76f2 | 152 | struct qdio_buffer_element *sbale; |
00bab910 SS |
153 | int sbal_idx, sbale_idx, sbal_no; |
154 | ||
779e6e1c JG |
155 | if (unlikely(qdio_err)) { |
156 | zfcp_hba_dbf_event_qdio(adapter, qdio_err, first, count); | |
00bab910 SS |
157 | zfcp_qdio_handler_error(adapter, 147); |
158 | return; | |
159 | } | |
1da177e4 | 160 | |
1da177e4 LT |
161 | /* |
162 | * go through all SBALs from input queue currently | |
163 | * returned by QDIO layer | |
164 | */ | |
00bab910 SS |
165 | for (sbal_no = 0; sbal_no < count; sbal_no++) { |
166 | sbal_idx = (first + sbal_no) % QDIO_MAX_BUFFERS_PER_Q; | |
1da177e4 LT |
167 | |
168 | /* go through all SBALEs of SBAL */ | |
00bab910 SS |
169 | for (sbale_idx = 0; sbale_idx < QDIO_MAX_ELEMENTS_PER_BUFFER; |
170 | sbale_idx++) { | |
171 | sbale = zfcp_qdio_sbale(queue, sbal_idx, sbale_idx); | |
b03670e5 | 172 | zfcp_qdio_reqid_check(adapter, |
00bab910 SS |
173 | (unsigned long) sbale->addr, |
174 | sbal_idx); | |
175 | if (likely(sbale->flags & SBAL_FLAGS_LAST_ENTRY)) | |
1da177e4 LT |
176 | break; |
177 | }; | |
178 | ||
00bab910 SS |
179 | if (unlikely(!(sbale->flags & SBAL_FLAGS_LAST_ENTRY))) |
180 | dev_warn(&adapter->ccw_device->dev, | |
ff3b24fa CS |
181 | "A QDIO protocol error occurred, " |
182 | "operations continue\n"); | |
1da177e4 LT |
183 | } |
184 | ||
185 | /* | |
186 | * put range of SBALs back to response queue | |
187 | * (including SBALs which have already been free before) | |
188 | */ | |
00bab910 | 189 | zfcp_qdio_resp_put_back(adapter, count); |
1da177e4 LT |
190 | } |
191 | ||
1da177e4 | 192 | /** |
00bab910 SS |
193 | * zfcp_qdio_sbale_req - return ptr to SBALE of req_q for a struct zfcp_fsf_req |
194 | * @fsf_req: pointer to struct fsf_req | |
195 | * Returns: pointer to qdio_buffer_element (SBALE) structure | |
1da177e4 | 196 | */ |
44cc76f2 | 197 | struct qdio_buffer_element *zfcp_qdio_sbale_req(struct zfcp_fsf_req *req) |
1da177e4 | 198 | { |
00bab910 | 199 | return zfcp_qdio_sbale(&req->adapter->req_q, req->sbal_last, 0); |
1da177e4 LT |
200 | } |
201 | ||
202 | /** | |
00bab910 SS |
203 | * zfcp_qdio_sbale_curr - return curr SBALE on req_q for a struct zfcp_fsf_req |
204 | * @fsf_req: pointer to struct fsf_req | |
205 | * Returns: pointer to qdio_buffer_element (SBALE) structure | |
1da177e4 | 206 | */ |
44cc76f2 | 207 | struct qdio_buffer_element *zfcp_qdio_sbale_curr(struct zfcp_fsf_req *req) |
1da177e4 | 208 | { |
00bab910 SS |
209 | return zfcp_qdio_sbale(&req->adapter->req_q, req->sbal_last, |
210 | req->sbale_curr); | |
1da177e4 LT |
211 | } |
212 | ||
00bab910 | 213 | static void zfcp_qdio_sbal_limit(struct zfcp_fsf_req *fsf_req, int max_sbals) |
1da177e4 | 214 | { |
00bab910 | 215 | int count = atomic_read(&fsf_req->adapter->req_q.count); |
1da177e4 | 216 | count = min(count, max_sbals); |
00bab910 SS |
217 | fsf_req->sbal_limit = (fsf_req->sbal_first + count - 1) |
218 | % QDIO_MAX_BUFFERS_PER_Q; | |
1da177e4 LT |
219 | } |
220 | ||
44cc76f2 | 221 | static struct qdio_buffer_element * |
1da177e4 LT |
222 | zfcp_qdio_sbal_chain(struct zfcp_fsf_req *fsf_req, unsigned long sbtype) |
223 | { | |
44cc76f2 | 224 | struct qdio_buffer_element *sbale; |
1da177e4 LT |
225 | |
226 | /* set last entry flag in current SBALE of current SBAL */ | |
227 | sbale = zfcp_qdio_sbale_curr(fsf_req); | |
228 | sbale->flags |= SBAL_FLAGS_LAST_ENTRY; | |
229 | ||
230 | /* don't exceed last allowed SBAL */ | |
e891bffe | 231 | if (fsf_req->sbal_last == fsf_req->sbal_limit) |
1da177e4 LT |
232 | return NULL; |
233 | ||
234 | /* set chaining flag in first SBALE of current SBAL */ | |
00bab910 | 235 | sbale = zfcp_qdio_sbale_req(fsf_req); |
1da177e4 LT |
236 | sbale->flags |= SBAL_FLAGS0_MORE_SBALS; |
237 | ||
238 | /* calculate index of next SBAL */ | |
e891bffe MP |
239 | fsf_req->sbal_last++; |
240 | fsf_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q; | |
1da177e4 LT |
241 | |
242 | /* keep this requests number of SBALs up-to-date */ | |
243 | fsf_req->sbal_number++; | |
244 | ||
245 | /* start at first SBALE of new SBAL */ | |
246 | fsf_req->sbale_curr = 0; | |
247 | ||
248 | /* set storage-block type for new SBAL */ | |
249 | sbale = zfcp_qdio_sbale_curr(fsf_req); | |
250 | sbale->flags |= sbtype; | |
251 | ||
252 | return sbale; | |
253 | } | |
254 | ||
44cc76f2 | 255 | static struct qdio_buffer_element * |
1da177e4 LT |
256 | zfcp_qdio_sbale_next(struct zfcp_fsf_req *fsf_req, unsigned long sbtype) |
257 | { | |
258 | if (fsf_req->sbale_curr == ZFCP_LAST_SBALE_PER_SBAL) | |
259 | return zfcp_qdio_sbal_chain(fsf_req, sbtype); | |
1da177e4 | 260 | fsf_req->sbale_curr++; |
1da177e4 LT |
261 | return zfcp_qdio_sbale_curr(fsf_req); |
262 | } | |
263 | ||
00bab910 | 264 | static void zfcp_qdio_undo_sbals(struct zfcp_fsf_req *fsf_req) |
1da177e4 | 265 | { |
00bab910 SS |
266 | struct qdio_buffer **sbal = fsf_req->adapter->req_q.sbal; |
267 | int first = fsf_req->sbal_first; | |
268 | int last = fsf_req->sbal_last; | |
269 | int count = (last - first + QDIO_MAX_BUFFERS_PER_Q) % | |
270 | QDIO_MAX_BUFFERS_PER_Q + 1; | |
271 | zfcp_qdio_zero_sbals(sbal, first, count); | |
1da177e4 LT |
272 | } |
273 | ||
00bab910 SS |
274 | static int zfcp_qdio_fill_sbals(struct zfcp_fsf_req *fsf_req, |
275 | unsigned int sbtype, void *start_addr, | |
276 | unsigned int total_length) | |
1da177e4 | 277 | { |
44cc76f2 | 278 | struct qdio_buffer_element *sbale; |
1da177e4 LT |
279 | unsigned long remaining, length; |
280 | void *addr; | |
281 | ||
00bab910 | 282 | /* split segment up */ |
1da177e4 LT |
283 | for (addr = start_addr, remaining = total_length; remaining > 0; |
284 | addr += length, remaining -= length) { | |
00bab910 SS |
285 | sbale = zfcp_qdio_sbale_next(fsf_req, sbtype); |
286 | if (!sbale) { | |
2450d3e7 | 287 | atomic_inc(&fsf_req->adapter->qdio_outb_full); |
00bab910 | 288 | zfcp_qdio_undo_sbals(fsf_req); |
1da177e4 LT |
289 | return -EINVAL; |
290 | } | |
00bab910 SS |
291 | |
292 | /* new piece must not exceed next page boundary */ | |
1da177e4 | 293 | length = min(remaining, |
00bab910 | 294 | (PAGE_SIZE - ((unsigned long)addr & |
1da177e4 | 295 | (PAGE_SIZE - 1)))); |
00bab910 SS |
296 | sbale->addr = addr; |
297 | sbale->length = length; | |
1da177e4 | 298 | } |
00bab910 | 299 | return 0; |
1da177e4 LT |
300 | } |
301 | ||
1da177e4 LT |
302 | /** |
303 | * zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list | |
304 | * @fsf_req: request to be processed | |
305 | * @sbtype: SBALE flags | |
306 | * @sg: scatter-gather list | |
1da177e4 | 307 | * @max_sbals: upper bound for number of SBALs to be used |
00bab910 | 308 | * Returns: number of bytes, or error (negativ) |
1da177e4 | 309 | */ |
00bab910 SS |
310 | int zfcp_qdio_sbals_from_sg(struct zfcp_fsf_req *fsf_req, unsigned long sbtype, |
311 | struct scatterlist *sg, int max_sbals) | |
1da177e4 | 312 | { |
44cc76f2 | 313 | struct qdio_buffer_element *sbale; |
00bab910 | 314 | int retval, bytes = 0; |
1da177e4 LT |
315 | |
316 | /* figure out last allowed SBAL */ | |
317 | zfcp_qdio_sbal_limit(fsf_req, max_sbals); | |
318 | ||
00bab910 SS |
319 | /* set storage-block type for this request */ |
320 | sbale = zfcp_qdio_sbale_req(fsf_req); | |
1da177e4 LT |
321 | sbale->flags |= sbtype; |
322 | ||
00bab910 SS |
323 | for (; sg; sg = sg_next(sg)) { |
324 | retval = zfcp_qdio_fill_sbals(fsf_req, sbtype, sg_virt(sg), | |
325 | sg->length); | |
326 | if (retval < 0) | |
327 | return retval; | |
328 | bytes += sg->length; | |
1da177e4 | 329 | } |
00bab910 | 330 | |
1da177e4 LT |
331 | /* assume that no other SBALEs are to follow in the same SBAL */ |
332 | sbale = zfcp_qdio_sbale_curr(fsf_req); | |
333 | sbale->flags |= SBAL_FLAGS_LAST_ENTRY; | |
00bab910 | 334 | |
1da177e4 LT |
335 | return bytes; |
336 | } | |
337 | ||
1da177e4 | 338 | /** |
00bab910 SS |
339 | * zfcp_qdio_send - set PCI flag in first SBALE and send req to QDIO |
340 | * @fsf_req: pointer to struct zfcp_fsf_req | |
341 | * Returns: 0 on success, error otherwise | |
1da177e4 | 342 | */ |
00bab910 | 343 | int zfcp_qdio_send(struct zfcp_fsf_req *fsf_req) |
1da177e4 | 344 | { |
00bab910 SS |
345 | struct zfcp_adapter *adapter = fsf_req->adapter; |
346 | struct zfcp_qdio_queue *req_q = &adapter->req_q; | |
347 | int first = fsf_req->sbal_first; | |
348 | int count = fsf_req->sbal_number; | |
349 | int retval, pci, pci_batch; | |
44cc76f2 | 350 | struct qdio_buffer_element *sbale; |
00bab910 SS |
351 | |
352 | /* acknowledgements for transferred buffers */ | |
0406289e | 353 | pci_batch = adapter->req_q_pci_batch + count; |
00bab910 SS |
354 | if (unlikely(pci_batch >= ZFCP_QDIO_PCI_INTERVAL)) { |
355 | pci_batch %= ZFCP_QDIO_PCI_INTERVAL; | |
356 | pci = first + count - (pci_batch + 1); | |
357 | pci %= QDIO_MAX_BUFFERS_PER_Q; | |
358 | sbale = zfcp_qdio_sbale(req_q, pci, 0); | |
359 | sbale->flags |= SBAL_FLAGS0_PCI; | |
360 | } | |
361 | ||
362 | retval = do_QDIO(adapter->ccw_device, QDIO_FLAG_SYNC_OUTPUT, 0, first, | |
779e6e1c | 363 | count); |
00bab910 SS |
364 | if (unlikely(retval)) { |
365 | zfcp_qdio_zero_sbals(req_q->sbal, first, count); | |
366 | return retval; | |
367 | } | |
368 | ||
369 | /* account for transferred buffers */ | |
370 | atomic_sub(count, &req_q->count); | |
371 | req_q->first += count; | |
372 | req_q->first %= QDIO_MAX_BUFFERS_PER_Q; | |
0406289e | 373 | adapter->req_q_pci_batch = pci_batch; |
00bab910 | 374 | return 0; |
1da177e4 LT |
375 | } |
376 | ||
00bab910 SS |
377 | /** |
378 | * zfcp_qdio_allocate - allocate queue memory and initialize QDIO data | |
379 | * @adapter: pointer to struct zfcp_adapter | |
380 | * Returns: -ENOMEM on memory allocation error or return value from | |
381 | * qdio_allocate | |
382 | */ | |
383 | int zfcp_qdio_allocate(struct zfcp_adapter *adapter) | |
384 | { | |
385 | struct qdio_initialize *init_data; | |
386 | ||
387 | if (zfcp_qdio_buffers_enqueue(adapter->req_q.sbal) || | |
388 | zfcp_qdio_buffers_enqueue(adapter->resp_q.sbal)) | |
389 | return -ENOMEM; | |
390 | ||
391 | init_data = &adapter->qdio_init_data; | |
392 | ||
393 | init_data->cdev = adapter->ccw_device; | |
394 | init_data->q_format = QDIO_ZFCP_QFMT; | |
395 | memcpy(init_data->adapter_name, zfcp_get_busid_by_adapter(adapter), 8); | |
396 | ASCEBC(init_data->adapter_name, 8); | |
397 | init_data->qib_param_field_format = 0; | |
398 | init_data->qib_param_field = NULL; | |
399 | init_data->input_slib_elements = NULL; | |
400 | init_data->output_slib_elements = NULL; | |
00bab910 SS |
401 | init_data->no_input_qs = 1; |
402 | init_data->no_output_qs = 1; | |
403 | init_data->input_handler = zfcp_qdio_int_resp; | |
404 | init_data->output_handler = zfcp_qdio_int_req; | |
405 | init_data->int_parm = (unsigned long) adapter; | |
406 | init_data->flags = QDIO_INBOUND_0COPY_SBALS | | |
407 | QDIO_OUTBOUND_0COPY_SBALS | QDIO_USE_OUTBOUND_PCIS; | |
408 | init_data->input_sbal_addr_array = | |
409 | (void **) (adapter->resp_q.sbal); | |
410 | init_data->output_sbal_addr_array = | |
411 | (void **) (adapter->req_q.sbal); | |
412 | ||
413 | return qdio_allocate(init_data); | |
414 | } | |
415 | ||
416 | /** | |
417 | * zfcp_close_qdio - close qdio queues for an adapter | |
1da177e4 | 418 | */ |
00bab910 | 419 | void zfcp_qdio_close(struct zfcp_adapter *adapter) |
1da177e4 | 420 | { |
00bab910 SS |
421 | struct zfcp_qdio_queue *req_q; |
422 | int first, count; | |
423 | ||
44cc76f2 | 424 | if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)) |
00bab910 SS |
425 | return; |
426 | ||
427 | /* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */ | |
428 | req_q = &adapter->req_q; | |
0406289e | 429 | spin_lock_bh(&adapter->req_q_lock); |
00bab910 | 430 | atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status); |
0406289e | 431 | spin_unlock_bh(&adapter->req_q_lock); |
00bab910 | 432 | |
779e6e1c | 433 | qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR); |
00bab910 SS |
434 | |
435 | /* cleanup used outbound sbals */ | |
436 | count = atomic_read(&req_q->count); | |
437 | if (count < QDIO_MAX_BUFFERS_PER_Q) { | |
438 | first = (req_q->first + count) % QDIO_MAX_BUFFERS_PER_Q; | |
439 | count = QDIO_MAX_BUFFERS_PER_Q - count; | |
440 | zfcp_qdio_zero_sbals(req_q->sbal, first, count); | |
1da177e4 | 441 | } |
00bab910 SS |
442 | req_q->first = 0; |
443 | atomic_set(&req_q->count, 0); | |
0406289e | 444 | adapter->req_q_pci_batch = 0; |
00bab910 SS |
445 | adapter->resp_q.first = 0; |
446 | atomic_set(&adapter->resp_q.count, 0); | |
1da177e4 LT |
447 | } |
448 | ||
00bab910 SS |
449 | /** |
450 | * zfcp_qdio_open - prepare and initialize response queue | |
451 | * @adapter: pointer to struct zfcp_adapter | |
452 | * Returns: 0 on success, otherwise -EIO | |
453 | */ | |
454 | int zfcp_qdio_open(struct zfcp_adapter *adapter) | |
455 | { | |
44cc76f2 | 456 | struct qdio_buffer_element *sbale; |
00bab910 SS |
457 | int cc; |
458 | ||
44cc76f2 | 459 | if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP) |
00bab910 SS |
460 | return -EIO; |
461 | ||
ff3b24fa CS |
462 | if (qdio_establish(&adapter->qdio_init_data)) |
463 | goto failed_establish; | |
00bab910 | 464 | |
ff3b24fa | 465 | if (qdio_activate(adapter->ccw_device)) |
00bab910 | 466 | goto failed_qdio; |
00bab910 SS |
467 | |
468 | for (cc = 0; cc < QDIO_MAX_BUFFERS_PER_Q; cc++) { | |
469 | sbale = &(adapter->resp_q.sbal[cc]->element[0]); | |
470 | sbale->length = 0; | |
471 | sbale->flags = SBAL_FLAGS_LAST_ENTRY; | |
472 | sbale->addr = NULL; | |
473 | } | |
474 | ||
475 | if (do_QDIO(adapter->ccw_device, QDIO_FLAG_SYNC_INPUT, 0, 0, | |
ff3b24fa | 476 | QDIO_MAX_BUFFERS_PER_Q)) |
00bab910 | 477 | goto failed_qdio; |
00bab910 SS |
478 | |
479 | /* set index of first avalable SBALS / number of available SBALS */ | |
480 | adapter->req_q.first = 0; | |
481 | atomic_set(&adapter->req_q.count, QDIO_MAX_BUFFERS_PER_Q); | |
0406289e | 482 | adapter->req_q_pci_batch = 0; |
00bab910 SS |
483 | |
484 | return 0; | |
485 | ||
486 | failed_qdio: | |
779e6e1c | 487 | qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR); |
ff3b24fa CS |
488 | failed_establish: |
489 | dev_err(&adapter->ccw_device->dev, | |
490 | "Setting up the QDIO connection to the FCP adapter failed\n"); | |
00bab910 SS |
491 | return -EIO; |
492 | } |