Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
00bab910 | 2 | * zfcp device driver |
1da177e4 | 3 | * |
00bab910 | 4 | * Setup and helper functions to access QDIO. |
1da177e4 | 5 | * |
a53c8fab | 6 | * Copyright IBM Corp. 2002, 2010 |
1da177e4 LT |
7 | */ |
8 | ||
ecf39d42 CS |
9 | #define KMSG_COMPONENT "zfcp" |
10 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
11 | ||
5a0e3ad6 | 12 | #include <linux/slab.h> |
3a4c5d59 | 13 | #include <linux/module.h> |
1da177e4 | 14 | #include "zfcp_ext.h" |
34c2b712 | 15 | #include "zfcp_qdio.h" |
1da177e4 | 16 | |
5d4e2262 | 17 | #define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer)) |
1da177e4 | 18 | |
86a9668a SS |
19 | static bool enable_multibuffer; |
20 | module_param_named(datarouter, enable_multibuffer, bool, 0400); | |
21 | MODULE_PARM_DESC(datarouter, "Enable hardware data router support"); | |
22 | ||
00bab910 | 23 | static int zfcp_qdio_buffers_enqueue(struct qdio_buffer **sbal) |
1da177e4 | 24 | { |
b4e44590 | 25 | int pos; |
1da177e4 | 26 | |
b4e44590 | 27 | for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos += QBUFF_PER_PAGE) { |
00bab910 SS |
28 | sbal[pos] = (struct qdio_buffer *) get_zeroed_page(GFP_KERNEL); |
29 | if (!sbal[pos]) | |
b4e44590 | 30 | return -ENOMEM; |
b4e44590 SS |
31 | } |
32 | for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos++) | |
33 | if (pos % QBUFF_PER_PAGE) | |
00bab910 | 34 | sbal[pos] = sbal[pos - 1] + 1; |
b4e44590 | 35 | return 0; |
1da177e4 LT |
36 | } |
37 | ||
339f4f4e CS |
38 | static void zfcp_qdio_handler_error(struct zfcp_qdio *qdio, char *id, |
39 | unsigned int qdio_err) | |
1da177e4 | 40 | { |
564e1c86 SS |
41 | struct zfcp_adapter *adapter = qdio->adapter; |
42 | ||
ff3b24fa | 43 | dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n"); |
1da177e4 | 44 | |
86a9668a | 45 | if (qdio_err & QDIO_ERROR_SLSB_STATE) { |
339f4f4e | 46 | zfcp_qdio_siosl(adapter); |
86a9668a SS |
47 | zfcp_erp_adapter_shutdown(adapter, 0, id); |
48 | return; | |
49 | } | |
00bab910 SS |
50 | zfcp_erp_adapter_reopen(adapter, |
51 | ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED | | |
ea4a3a6a | 52 | ZFCP_STATUS_COMMON_ERP_FAILED, id); |
1da177e4 LT |
53 | } |
54 | ||
5d4e2262 CS |
55 | static void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int cnt) |
56 | { | |
57 | int i, sbal_idx; | |
58 | ||
59 | for (i = first; i < first + cnt; i++) { | |
60 | sbal_idx = i % QDIO_MAX_BUFFERS_PER_Q; | |
61 | memset(sbal[sbal_idx], 0, sizeof(struct qdio_buffer)); | |
62 | } | |
63 | } | |
64 | ||
94506fd1 | 65 | /* this needs to be called prior to updating the queue fill level */ |
41e05a12 | 66 | static inline void zfcp_qdio_account(struct zfcp_qdio *qdio) |
94506fd1 | 67 | { |
41e05a12 | 68 | unsigned long long now, span; |
706eca49 | 69 | int used; |
94506fd1 | 70 | |
1aae0560 | 71 | now = get_tod_clock_monotonic(); |
41e05a12 | 72 | span = (now - qdio->req_q_time) >> 12; |
706eca49 | 73 | used = QDIO_MAX_BUFFERS_PER_Q - atomic_read(&qdio->req_q_free); |
564e1c86 SS |
74 | qdio->req_q_util += used * span; |
75 | qdio->req_q_time = now; | |
94506fd1 MP |
76 | } |
77 | ||
779e6e1c | 78 | static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err, |
706eca49 | 79 | int queue_no, int idx, int count, |
00bab910 | 80 | unsigned long parm) |
1da177e4 | 81 | { |
564e1c86 | 82 | struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm; |
1da177e4 | 83 | |
779e6e1c | 84 | if (unlikely(qdio_err)) { |
339f4f4e | 85 | zfcp_qdio_handler_error(qdio, "qdireq1", qdio_err); |
00bab910 SS |
86 | return; |
87 | } | |
1da177e4 LT |
88 | |
89 | /* cleanup all SBALs being program-owned now */ | |
706eca49 | 90 | zfcp_qdio_zero_sbals(qdio->req_q, idx, count); |
1da177e4 | 91 | |
44a24cb3 | 92 | spin_lock_irq(&qdio->stat_lock); |
564e1c86 | 93 | zfcp_qdio_account(qdio); |
44a24cb3 | 94 | spin_unlock_irq(&qdio->stat_lock); |
706eca49 | 95 | atomic_add(count, &qdio->req_q_free); |
564e1c86 | 96 | wake_up(&qdio->req_q_wq); |
1da177e4 LT |
97 | } |
98 | ||
779e6e1c | 99 | static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err, |
706eca49 | 100 | int queue_no, int idx, int count, |
00bab910 SS |
101 | unsigned long parm) |
102 | { | |
564e1c86 | 103 | struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm; |
86a9668a | 104 | struct zfcp_adapter *adapter = qdio->adapter; |
86a9668a | 105 | int sbal_no, sbal_idx; |
00bab910 | 106 | |
779e6e1c | 107 | if (unlikely(qdio_err)) { |
86a9668a | 108 | if (zfcp_adapter_multi_buffer_active(adapter)) { |
01e60527 SM |
109 | void *pl[ZFCP_QDIO_MAX_SBALS_PER_REQ + 1]; |
110 | struct qdio_buffer_element *sbale; | |
111 | u64 req_id; | |
112 | u8 scount; | |
113 | ||
114 | memset(pl, 0, | |
115 | ZFCP_QDIO_MAX_SBALS_PER_REQ * sizeof(void *)); | |
86a9668a SS |
116 | sbale = qdio->res_q[idx]->element; |
117 | req_id = (u64) sbale->addr; | |
01e60527 SM |
118 | scount = min(sbale->scount + 1, |
119 | ZFCP_QDIO_MAX_SBALS_PER_REQ + 1); | |
120 | /* incl. signaling SBAL */ | |
86a9668a SS |
121 | |
122 | for (sbal_no = 0; sbal_no < scount; sbal_no++) { | |
123 | sbal_idx = (idx + sbal_no) % | |
124 | QDIO_MAX_BUFFERS_PER_Q; | |
125 | pl[sbal_no] = qdio->res_q[sbal_idx]; | |
126 | } | |
127 | zfcp_dbf_hba_def_err(adapter, req_id, scount, pl); | |
128 | } | |
339f4f4e | 129 | zfcp_qdio_handler_error(qdio, "qdires1", qdio_err); |
00bab910 SS |
130 | return; |
131 | } | |
1da177e4 | 132 | |
1da177e4 LT |
133 | /* |
134 | * go through all SBALs from input queue currently | |
135 | * returned by QDIO layer | |
136 | */ | |
00bab910 | 137 | for (sbal_no = 0; sbal_no < count; sbal_no++) { |
706eca49 | 138 | sbal_idx = (idx + sbal_no) % QDIO_MAX_BUFFERS_PER_Q; |
1da177e4 | 139 | /* go through all SBALEs of SBAL */ |
564e1c86 | 140 | zfcp_fsf_reqid_check(qdio, sbal_idx); |
1da177e4 LT |
141 | } |
142 | ||
143 | /* | |
706eca49 | 144 | * put SBALs back to response queue |
1da177e4 | 145 | */ |
706eca49 | 146 | if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, idx, count)) |
ea4a3a6a | 147 | zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdires2"); |
1da177e4 LT |
148 | } |
149 | ||
44cc76f2 | 150 | static struct qdio_buffer_element * |
1674b405 | 151 | zfcp_qdio_sbal_chain(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req) |
1da177e4 | 152 | { |
44cc76f2 | 153 | struct qdio_buffer_element *sbale; |
1da177e4 LT |
154 | |
155 | /* set last entry flag in current SBALE of current SBAL */ | |
564e1c86 | 156 | sbale = zfcp_qdio_sbale_curr(qdio, q_req); |
3ec90878 | 157 | sbale->eflags |= SBAL_EFLAGS_LAST_ENTRY; |
1da177e4 LT |
158 | |
159 | /* don't exceed last allowed SBAL */ | |
42428f74 | 160 | if (q_req->sbal_last == q_req->sbal_limit) |
1da177e4 LT |
161 | return NULL; |
162 | ||
163 | /* set chaining flag in first SBALE of current SBAL */ | |
564e1c86 | 164 | sbale = zfcp_qdio_sbale_req(qdio, q_req); |
3ec90878 | 165 | sbale->sflags |= SBAL_SFLAGS0_MORE_SBALS; |
1da177e4 LT |
166 | |
167 | /* calculate index of next SBAL */ | |
42428f74 SS |
168 | q_req->sbal_last++; |
169 | q_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q; | |
1da177e4 LT |
170 | |
171 | /* keep this requests number of SBALs up-to-date */ | |
42428f74 | 172 | q_req->sbal_number++; |
01b04759 | 173 | BUG_ON(q_req->sbal_number > ZFCP_QDIO_MAX_SBALS_PER_REQ); |
1da177e4 LT |
174 | |
175 | /* start at first SBALE of new SBAL */ | |
42428f74 | 176 | q_req->sbale_curr = 0; |
1da177e4 LT |
177 | |
178 | /* set storage-block type for new SBAL */ | |
564e1c86 | 179 | sbale = zfcp_qdio_sbale_curr(qdio, q_req); |
3ec90878 | 180 | sbale->sflags |= q_req->sbtype; |
1da177e4 LT |
181 | |
182 | return sbale; | |
183 | } | |
184 | ||
44cc76f2 | 185 | static struct qdio_buffer_element * |
1674b405 | 186 | zfcp_qdio_sbale_next(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req) |
1da177e4 | 187 | { |
86a9668a | 188 | if (q_req->sbale_curr == qdio->max_sbale_per_sbal - 1) |
1674b405 | 189 | return zfcp_qdio_sbal_chain(qdio, q_req); |
42428f74 | 190 | q_req->sbale_curr++; |
564e1c86 | 191 | return zfcp_qdio_sbale_curr(qdio, q_req); |
1da177e4 LT |
192 | } |
193 | ||
1da177e4 LT |
194 | /** |
195 | * zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list | |
1674b405 CS |
196 | * @qdio: pointer to struct zfcp_qdio |
197 | * @q_req: pointer to struct zfcp_qdio_req | |
1da177e4 | 198 | * @sg: scatter-gather list |
1da177e4 | 199 | * @max_sbals: upper bound for number of SBALs to be used |
86a9668a | 200 | * Returns: zero or -EINVAL on error |
1da177e4 | 201 | */ |
34c2b712 | 202 | int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req, |
01b04759 | 203 | struct scatterlist *sg) |
1da177e4 | 204 | { |
44cc76f2 | 205 | struct qdio_buffer_element *sbale; |
1da177e4 | 206 | |
00bab910 | 207 | /* set storage-block type for this request */ |
564e1c86 | 208 | sbale = zfcp_qdio_sbale_req(qdio, q_req); |
3ec90878 | 209 | sbale->sflags |= q_req->sbtype; |
1da177e4 | 210 | |
00bab910 | 211 | for (; sg; sg = sg_next(sg)) { |
1674b405 | 212 | sbale = zfcp_qdio_sbale_next(qdio, q_req); |
68322984 CS |
213 | if (!sbale) { |
214 | atomic_inc(&qdio->req_q_full); | |
706eca49 SS |
215 | zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first, |
216 | q_req->sbal_number); | |
68322984 CS |
217 | return -EINVAL; |
218 | } | |
68322984 CS |
219 | sbale->addr = sg_virt(sg); |
220 | sbale->length = sg->length; | |
1da177e4 | 221 | } |
86a9668a | 222 | return 0; |
1da177e4 LT |
223 | } |
224 | ||
6b9e1520 CS |
225 | static int zfcp_qdio_sbal_check(struct zfcp_qdio *qdio) |
226 | { | |
706eca49 | 227 | if (atomic_read(&qdio->req_q_free) || |
c2af7545 | 228 | !(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)) |
6b9e1520 | 229 | return 1; |
6b9e1520 CS |
230 | return 0; |
231 | } | |
232 | ||
233 | /** | |
234 | * zfcp_qdio_sbal_get - get free sbal in request queue, wait if necessary | |
235 | * @qdio: pointer to struct zfcp_qdio | |
236 | * | |
237 | * The req_q_lock must be held by the caller of this function, and | |
238 | * this function may only be called from process context; it will | |
239 | * sleep when waiting for a free sbal. | |
240 | * | |
241 | * Returns: 0 on success, -EIO if there is no free sbal after waiting. | |
242 | */ | |
243 | int zfcp_qdio_sbal_get(struct zfcp_qdio *qdio) | |
244 | { | |
245 | long ret; | |
246 | ||
d79ff142 MP |
247 | ret = wait_event_interruptible_lock_irq_timeout(qdio->req_q_wq, |
248 | zfcp_qdio_sbal_check(qdio), qdio->req_q_lock, 5 * HZ); | |
c2af7545 CS |
249 | |
250 | if (!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)) | |
251 | return -EIO; | |
252 | ||
6b9e1520 CS |
253 | if (ret > 0) |
254 | return 0; | |
c2af7545 | 255 | |
6b9e1520 CS |
256 | if (!ret) { |
257 | atomic_inc(&qdio->req_q_full); | |
258 | /* assume hanging outbound queue, try queue recovery */ | |
ea4a3a6a | 259 | zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdsbg_1"); |
6b9e1520 CS |
260 | } |
261 | ||
6b9e1520 CS |
262 | return -EIO; |
263 | } | |
264 | ||
1da177e4 | 265 | /** |
00bab910 | 266 | * zfcp_qdio_send - set PCI flag in first SBALE and send req to QDIO |
564e1c86 | 267 | * @qdio: pointer to struct zfcp_qdio |
34c2b712 | 268 | * @q_req: pointer to struct zfcp_qdio_req |
00bab910 | 269 | * Returns: 0 on success, error otherwise |
1da177e4 | 270 | */ |
34c2b712 | 271 | int zfcp_qdio_send(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req) |
1da177e4 | 272 | { |
21ddaa53 | 273 | int retval; |
706eca49 | 274 | u8 sbal_number = q_req->sbal_number; |
00bab910 | 275 | |
44a24cb3 | 276 | spin_lock(&qdio->stat_lock); |
564e1c86 | 277 | zfcp_qdio_account(qdio); |
44a24cb3 | 278 | spin_unlock(&qdio->stat_lock); |
94506fd1 | 279 | |
706eca49 SS |
280 | retval = do_QDIO(qdio->adapter->ccw_device, QDIO_FLAG_SYNC_OUTPUT, 0, |
281 | q_req->sbal_first, sbal_number); | |
282 | ||
00bab910 | 283 | if (unlikely(retval)) { |
706eca49 SS |
284 | zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first, |
285 | sbal_number); | |
00bab910 SS |
286 | return retval; |
287 | } | |
288 | ||
289 | /* account for transferred buffers */ | |
706eca49 SS |
290 | atomic_sub(sbal_number, &qdio->req_q_free); |
291 | qdio->req_q_idx += sbal_number; | |
292 | qdio->req_q_idx %= QDIO_MAX_BUFFERS_PER_Q; | |
293 | ||
00bab910 | 294 | return 0; |
1da177e4 LT |
295 | } |
296 | ||
564e1c86 SS |
297 | |
298 | static void zfcp_qdio_setup_init_data(struct qdio_initialize *id, | |
299 | struct zfcp_qdio *qdio) | |
300 | { | |
d36deae7 | 301 | memset(id, 0, sizeof(*id)); |
564e1c86 SS |
302 | id->cdev = qdio->adapter->ccw_device; |
303 | id->q_format = QDIO_ZFCP_QFMT; | |
304 | memcpy(id->adapter_name, dev_name(&id->cdev->dev), 8); | |
305 | ASCEBC(id->adapter_name, 8); | |
dcc18f48 | 306 | id->qib_rflags = QIB_RFLAGS_ENABLE_DATA_DIV; |
86a9668a SS |
307 | if (enable_multibuffer) |
308 | id->qdr_ac |= QDR_AC_MULTI_BUFFER_ENABLE; | |
564e1c86 SS |
309 | id->no_input_qs = 1; |
310 | id->no_output_qs = 1; | |
311 | id->input_handler = zfcp_qdio_int_resp; | |
312 | id->output_handler = zfcp_qdio_int_req; | |
313 | id->int_parm = (unsigned long) qdio; | |
706eca49 SS |
314 | id->input_sbal_addr_array = (void **) (qdio->res_q); |
315 | id->output_sbal_addr_array = (void **) (qdio->req_q); | |
3d6c76ff JG |
316 | id->scan_threshold = |
317 | QDIO_MAX_BUFFERS_PER_Q - ZFCP_QDIO_MAX_SBALS_PER_REQ * 2; | |
564e1c86 | 318 | } |
dcc18f48 | 319 | |
00bab910 SS |
320 | /** |
321 | * zfcp_qdio_allocate - allocate queue memory and initialize QDIO data | |
322 | * @adapter: pointer to struct zfcp_adapter | |
323 | * Returns: -ENOMEM on memory allocation error or return value from | |
324 | * qdio_allocate | |
325 | */ | |
d5a282a1 | 326 | static int zfcp_qdio_allocate(struct zfcp_qdio *qdio) |
00bab910 | 327 | { |
564e1c86 | 328 | struct qdio_initialize init_data; |
00bab910 | 329 | |
706eca49 SS |
330 | if (zfcp_qdio_buffers_enqueue(qdio->req_q) || |
331 | zfcp_qdio_buffers_enqueue(qdio->res_q)) | |
00bab910 SS |
332 | return -ENOMEM; |
333 | ||
564e1c86 | 334 | zfcp_qdio_setup_init_data(&init_data, qdio); |
3d63d3b4 | 335 | init_waitqueue_head(&qdio->req_q_wq); |
564e1c86 SS |
336 | |
337 | return qdio_allocate(&init_data); | |
00bab910 SS |
338 | } |
339 | ||
340 | /** | |
341 | * zfcp_close_qdio - close qdio queues for an adapter | |
564e1c86 | 342 | * @qdio: pointer to structure zfcp_qdio |
1da177e4 | 343 | */ |
564e1c86 | 344 | void zfcp_qdio_close(struct zfcp_qdio *qdio) |
1da177e4 | 345 | { |
706eca49 SS |
346 | struct zfcp_adapter *adapter = qdio->adapter; |
347 | int idx, count; | |
00bab910 | 348 | |
706eca49 | 349 | if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)) |
00bab910 SS |
350 | return; |
351 | ||
352 | /* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */ | |
44a24cb3 | 353 | spin_lock_irq(&qdio->req_q_lock); |
706eca49 | 354 | atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status); |
44a24cb3 | 355 | spin_unlock_irq(&qdio->req_q_lock); |
00bab910 | 356 | |
c2af7545 CS |
357 | wake_up(&qdio->req_q_wq); |
358 | ||
706eca49 | 359 | qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR); |
00bab910 SS |
360 | |
361 | /* cleanup used outbound sbals */ | |
706eca49 | 362 | count = atomic_read(&qdio->req_q_free); |
00bab910 | 363 | if (count < QDIO_MAX_BUFFERS_PER_Q) { |
706eca49 | 364 | idx = (qdio->req_q_idx + count) % QDIO_MAX_BUFFERS_PER_Q; |
00bab910 | 365 | count = QDIO_MAX_BUFFERS_PER_Q - count; |
706eca49 | 366 | zfcp_qdio_zero_sbals(qdio->req_q, idx, count); |
1da177e4 | 367 | } |
706eca49 SS |
368 | qdio->req_q_idx = 0; |
369 | atomic_set(&qdio->req_q_free, 0); | |
1da177e4 LT |
370 | } |
371 | ||
00bab910 SS |
372 | /** |
373 | * zfcp_qdio_open - prepare and initialize response queue | |
564e1c86 | 374 | * @qdio: pointer to struct zfcp_qdio |
00bab910 SS |
375 | * Returns: 0 on success, otherwise -EIO |
376 | */ | |
564e1c86 | 377 | int zfcp_qdio_open(struct zfcp_qdio *qdio) |
00bab910 | 378 | { |
44cc76f2 | 379 | struct qdio_buffer_element *sbale; |
564e1c86 | 380 | struct qdio_initialize init_data; |
706eca49 SS |
381 | struct zfcp_adapter *adapter = qdio->adapter; |
382 | struct ccw_device *cdev = adapter->ccw_device; | |
dcc18f48 | 383 | struct qdio_ssqd_desc ssqd; |
00bab910 SS |
384 | int cc; |
385 | ||
706eca49 | 386 | if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP) |
00bab910 SS |
387 | return -EIO; |
388 | ||
339f4f4e CS |
389 | atomic_clear_mask(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED, |
390 | &qdio->adapter->status); | |
391 | ||
564e1c86 SS |
392 | zfcp_qdio_setup_init_data(&init_data, qdio); |
393 | ||
394 | if (qdio_establish(&init_data)) | |
ff3b24fa | 395 | goto failed_establish; |
00bab910 | 396 | |
dcc18f48 CS |
397 | if (qdio_get_ssqd_desc(init_data.cdev, &ssqd)) |
398 | goto failed_qdio; | |
399 | ||
400 | if (ssqd.qdioac2 & CHSC_AC2_DATA_DIV_ENABLED) | |
401 | atomic_set_mask(ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED, | |
402 | &qdio->adapter->status); | |
403 | ||
86a9668a SS |
404 | if (ssqd.qdioac2 & CHSC_AC2_MULTI_BUFFER_ENABLED) { |
405 | atomic_set_mask(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status); | |
406 | qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER; | |
407 | } else { | |
408 | atomic_clear_mask(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status); | |
409 | qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER - 1; | |
410 | } | |
411 | ||
412 | qdio->max_sbale_per_req = | |
413 | ZFCP_QDIO_MAX_SBALS_PER_REQ * qdio->max_sbale_per_sbal | |
414 | - 2; | |
564e1c86 | 415 | if (qdio_activate(cdev)) |
00bab910 | 416 | goto failed_qdio; |
00bab910 SS |
417 | |
418 | for (cc = 0; cc < QDIO_MAX_BUFFERS_PER_Q; cc++) { | |
706eca49 | 419 | sbale = &(qdio->res_q[cc]->element[0]); |
00bab910 | 420 | sbale->length = 0; |
3ec90878 JG |
421 | sbale->eflags = SBAL_EFLAGS_LAST_ENTRY; |
422 | sbale->sflags = 0; | |
00bab910 SS |
423 | sbale->addr = NULL; |
424 | } | |
425 | ||
706eca49 | 426 | if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, 0, QDIO_MAX_BUFFERS_PER_Q)) |
00bab910 | 427 | goto failed_qdio; |
00bab910 | 428 | |
25985edc | 429 | /* set index of first available SBALS / number of available SBALS */ |
706eca49 SS |
430 | qdio->req_q_idx = 0; |
431 | atomic_set(&qdio->req_q_free, QDIO_MAX_BUFFERS_PER_Q); | |
3d63d3b4 | 432 | atomic_set_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &qdio->adapter->status); |
00bab910 | 433 | |
86a9668a SS |
434 | if (adapter->scsi_host) { |
435 | adapter->scsi_host->sg_tablesize = qdio->max_sbale_per_req; | |
436 | adapter->scsi_host->max_sectors = qdio->max_sbale_per_req * 8; | |
437 | } | |
438 | ||
00bab910 SS |
439 | return 0; |
440 | ||
441 | failed_qdio: | |
564e1c86 | 442 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); |
ff3b24fa | 443 | failed_establish: |
564e1c86 | 444 | dev_err(&cdev->dev, |
ff3b24fa | 445 | "Setting up the QDIO connection to the FCP adapter failed\n"); |
00bab910 SS |
446 | return -EIO; |
447 | } | |
d5a282a1 SS |
448 | |
449 | void zfcp_qdio_destroy(struct zfcp_qdio *qdio) | |
450 | { | |
d5a282a1 SS |
451 | int p; |
452 | ||
453 | if (!qdio) | |
454 | return; | |
455 | ||
456 | if (qdio->adapter->ccw_device) | |
457 | qdio_free(qdio->adapter->ccw_device); | |
458 | ||
d5a282a1 | 459 | for (p = 0; p < QDIO_MAX_BUFFERS_PER_Q; p += QBUFF_PER_PAGE) { |
706eca49 SS |
460 | free_page((unsigned long) qdio->req_q[p]); |
461 | free_page((unsigned long) qdio->res_q[p]); | |
d5a282a1 SS |
462 | } |
463 | ||
464 | kfree(qdio); | |
465 | } | |
466 | ||
467 | int zfcp_qdio_setup(struct zfcp_adapter *adapter) | |
468 | { | |
469 | struct zfcp_qdio *qdio; | |
470 | ||
471 | qdio = kzalloc(sizeof(struct zfcp_qdio), GFP_KERNEL); | |
472 | if (!qdio) | |
473 | return -ENOMEM; | |
474 | ||
475 | qdio->adapter = adapter; | |
476 | ||
477 | if (zfcp_qdio_allocate(qdio)) { | |
478 | zfcp_qdio_destroy(qdio); | |
479 | return -ENOMEM; | |
480 | } | |
481 | ||
482 | spin_lock_init(&qdio->req_q_lock); | |
483 | spin_lock_init(&qdio->stat_lock); | |
484 | ||
485 | adapter->qdio = qdio; | |
486 | return 0; | |
487 | } | |
488 | ||
339f4f4e CS |
489 | /** |
490 | * zfcp_qdio_siosl - Trigger logging in FCP channel | |
491 | * @adapter: The zfcp_adapter where to trigger logging | |
492 | * | |
493 | * Call the cio siosl function to trigger hardware logging. This | |
494 | * wrapper function sets a flag to ensure hardware logging is only | |
495 | * triggered once before going through qdio shutdown. | |
496 | * | |
497 | * The triggers are always run from qdio tasklet context, so no | |
498 | * additional synchronization is necessary. | |
499 | */ | |
500 | void zfcp_qdio_siosl(struct zfcp_adapter *adapter) | |
501 | { | |
502 | int rc; | |
503 | ||
504 | if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_SIOSL_ISSUED) | |
505 | return; | |
506 | ||
507 | rc = ccw_device_siosl(adapter->ccw_device); | |
508 | if (!rc) | |
509 | atomic_set_mask(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED, | |
510 | &adapter->status); | |
511 | } |