Commit | Line | Data |
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779e6e1c JG |
1 | /* |
2 | * linux/drivers/s390/cio/qdio_main.c | |
3 | * | |
4 | * Linux for s390 qdio support, buffer handling, qdio API and module support. | |
5 | * | |
6 | * Copyright 2000,2008 IBM Corp. | |
7 | * Author(s): Utz Bacher <utz.bacher@de.ibm.com> | |
8 | * Jan Glauber <jang@linux.vnet.ibm.com> | |
9 | * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com> | |
10 | */ | |
11 | #include <linux/module.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/timer.h> | |
15 | #include <linux/delay.h> | |
5a0e3ad6 | 16 | #include <linux/gfp.h> |
779e6e1c JG |
17 | #include <asm/atomic.h> |
18 | #include <asm/debug.h> | |
19 | #include <asm/qdio.h> | |
20 | ||
21 | #include "cio.h" | |
22 | #include "css.h" | |
23 | #include "device.h" | |
24 | #include "qdio.h" | |
25 | #include "qdio_debug.h" | |
779e6e1c JG |
26 | |
27 | MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\ | |
28 | "Jan Glauber <jang@linux.vnet.ibm.com>"); | |
29 | MODULE_DESCRIPTION("QDIO base support"); | |
30 | MODULE_LICENSE("GPL"); | |
31 | ||
32 | static inline int do_siga_sync(struct subchannel_id schid, | |
33 | unsigned int out_mask, unsigned int in_mask) | |
34 | { | |
35 | register unsigned long __fc asm ("0") = 2; | |
36 | register struct subchannel_id __schid asm ("1") = schid; | |
37 | register unsigned long out asm ("2") = out_mask; | |
38 | register unsigned long in asm ("3") = in_mask; | |
39 | int cc; | |
40 | ||
41 | asm volatile( | |
42 | " siga 0\n" | |
43 | " ipm %0\n" | |
44 | " srl %0,28\n" | |
45 | : "=d" (cc) | |
46 | : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc"); | |
47 | return cc; | |
48 | } | |
49 | ||
50 | static inline int do_siga_input(struct subchannel_id schid, unsigned int mask) | |
51 | { | |
52 | register unsigned long __fc asm ("0") = 1; | |
53 | register struct subchannel_id __schid asm ("1") = schid; | |
54 | register unsigned long __mask asm ("2") = mask; | |
55 | int cc; | |
56 | ||
57 | asm volatile( | |
58 | " siga 0\n" | |
59 | " ipm %0\n" | |
60 | " srl %0,28\n" | |
61 | : "=d" (cc) | |
62 | : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory"); | |
63 | return cc; | |
64 | } | |
65 | ||
66 | /** | |
67 | * do_siga_output - perform SIGA-w/wt function | |
68 | * @schid: subchannel id or in case of QEBSM the subchannel token | |
69 | * @mask: which output queues to process | |
70 | * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer | |
71 | * @fc: function code to perform | |
72 | * | |
73 | * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION. | |
74 | * Note: For IQDC unicast queues only the highest priority queue is processed. | |
75 | */ | |
76 | static inline int do_siga_output(unsigned long schid, unsigned long mask, | |
7a0b4cbc | 77 | unsigned int *bb, unsigned int fc) |
779e6e1c JG |
78 | { |
79 | register unsigned long __fc asm("0") = fc; | |
80 | register unsigned long __schid asm("1") = schid; | |
81 | register unsigned long __mask asm("2") = mask; | |
82 | int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION; | |
83 | ||
84 | asm volatile( | |
85 | " siga 0\n" | |
86 | "0: ipm %0\n" | |
87 | " srl %0,28\n" | |
88 | "1:\n" | |
89 | EX_TABLE(0b, 1b) | |
90 | : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask) | |
91 | : : "cc", "memory"); | |
92 | *bb = ((unsigned int) __fc) >> 31; | |
93 | return cc; | |
94 | } | |
95 | ||
96 | static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq) | |
97 | { | |
779e6e1c JG |
98 | /* all done or next buffer state different */ |
99 | if (ccq == 0 || ccq == 32) | |
100 | return 0; | |
101 | /* not all buffers processed */ | |
102 | if (ccq == 96 || ccq == 97) | |
103 | return 1; | |
104 | /* notify devices immediately */ | |
22f99347 | 105 | DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq); |
779e6e1c JG |
106 | return -EIO; |
107 | } | |
108 | ||
109 | /** | |
110 | * qdio_do_eqbs - extract buffer states for QEBSM | |
111 | * @q: queue to manipulate | |
112 | * @state: state of the extracted buffers | |
113 | * @start: buffer number to start at | |
114 | * @count: count of buffers to examine | |
50f769df | 115 | * @auto_ack: automatically acknowledge buffers |
779e6e1c | 116 | * |
73ac36ea | 117 | * Returns the number of successfully extracted equal buffer states. |
779e6e1c JG |
118 | * Stops processing if a state is different from the last buffers state. |
119 | */ | |
120 | static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state, | |
50f769df | 121 | int start, int count, int auto_ack) |
779e6e1c JG |
122 | { |
123 | unsigned int ccq = 0; | |
124 | int tmp_count = count, tmp_start = start; | |
125 | int nr = q->nr; | |
126 | int rc; | |
779e6e1c JG |
127 | |
128 | BUG_ON(!q->irq_ptr->sch_token); | |
6486cda6 | 129 | qperf_inc(q, eqbs); |
779e6e1c JG |
130 | |
131 | if (!q->is_input_q) | |
132 | nr += q->irq_ptr->nr_input_qs; | |
133 | again: | |
50f769df JG |
134 | ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count, |
135 | auto_ack); | |
779e6e1c JG |
136 | rc = qdio_check_ccq(q, ccq); |
137 | ||
138 | /* At least one buffer was processed, return and extract the remaining | |
139 | * buffers later. | |
140 | */ | |
23589d05 | 141 | if ((ccq == 96) && (count != tmp_count)) { |
6486cda6 | 142 | qperf_inc(q, eqbs_partial); |
779e6e1c | 143 | return (count - tmp_count); |
23589d05 | 144 | } |
22f99347 | 145 | |
779e6e1c | 146 | if (rc == 1) { |
22f99347 | 147 | DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq); |
779e6e1c JG |
148 | goto again; |
149 | } | |
150 | ||
151 | if (rc < 0) { | |
22f99347 JG |
152 | DBF_ERROR("%4x EQBS ERROR", SCH_NO(q)); |
153 | DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); | |
779e6e1c JG |
154 | q->handler(q->irq_ptr->cdev, |
155 | QDIO_ERROR_ACTIVATE_CHECK_CONDITION, | |
156 | 0, -1, -1, q->irq_ptr->int_parm); | |
157 | return 0; | |
158 | } | |
159 | return count - tmp_count; | |
160 | } | |
161 | ||
162 | /** | |
163 | * qdio_do_sqbs - set buffer states for QEBSM | |
164 | * @q: queue to manipulate | |
165 | * @state: new state of the buffers | |
166 | * @start: first buffer number to change | |
167 | * @count: how many buffers to change | |
168 | * | |
169 | * Returns the number of successfully changed buffers. | |
170 | * Does retrying until the specified count of buffer states is set or an | |
171 | * error occurs. | |
172 | */ | |
173 | static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start, | |
174 | int count) | |
175 | { | |
176 | unsigned int ccq = 0; | |
177 | int tmp_count = count, tmp_start = start; | |
178 | int nr = q->nr; | |
179 | int rc; | |
779e6e1c | 180 | |
50f769df JG |
181 | if (!count) |
182 | return 0; | |
183 | ||
779e6e1c | 184 | BUG_ON(!q->irq_ptr->sch_token); |
6486cda6 | 185 | qperf_inc(q, sqbs); |
779e6e1c JG |
186 | |
187 | if (!q->is_input_q) | |
188 | nr += q->irq_ptr->nr_input_qs; | |
189 | again: | |
190 | ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count); | |
191 | rc = qdio_check_ccq(q, ccq); | |
192 | if (rc == 1) { | |
22f99347 | 193 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq); |
6486cda6 | 194 | qperf_inc(q, sqbs_partial); |
779e6e1c JG |
195 | goto again; |
196 | } | |
197 | if (rc < 0) { | |
22f99347 JG |
198 | DBF_ERROR("%4x SQBS ERROR", SCH_NO(q)); |
199 | DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); | |
779e6e1c JG |
200 | q->handler(q->irq_ptr->cdev, |
201 | QDIO_ERROR_ACTIVATE_CHECK_CONDITION, | |
202 | 0, -1, -1, q->irq_ptr->int_parm); | |
203 | return 0; | |
204 | } | |
205 | WARN_ON(tmp_count); | |
206 | return count - tmp_count; | |
207 | } | |
208 | ||
209 | /* returns number of examined buffers and their common state in *state */ | |
210 | static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr, | |
50f769df JG |
211 | unsigned char *state, unsigned int count, |
212 | int auto_ack) | |
779e6e1c JG |
213 | { |
214 | unsigned char __state = 0; | |
215 | int i; | |
216 | ||
217 | BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK); | |
218 | BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q); | |
219 | ||
220 | if (is_qebsm(q)) | |
50f769df | 221 | return qdio_do_eqbs(q, state, bufnr, count, auto_ack); |
779e6e1c JG |
222 | |
223 | for (i = 0; i < count; i++) { | |
224 | if (!__state) | |
225 | __state = q->slsb.val[bufnr]; | |
226 | else if (q->slsb.val[bufnr] != __state) | |
227 | break; | |
228 | bufnr = next_buf(bufnr); | |
229 | } | |
230 | *state = __state; | |
231 | return i; | |
232 | } | |
233 | ||
60b5df2f JG |
234 | static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr, |
235 | unsigned char *state, int auto_ack) | |
779e6e1c | 236 | { |
50f769df | 237 | return get_buf_states(q, bufnr, state, 1, auto_ack); |
779e6e1c JG |
238 | } |
239 | ||
240 | /* wrap-around safe setting of slsb states, returns number of changed buffers */ | |
241 | static inline int set_buf_states(struct qdio_q *q, int bufnr, | |
242 | unsigned char state, int count) | |
243 | { | |
244 | int i; | |
245 | ||
246 | BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK); | |
247 | BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q); | |
248 | ||
249 | if (is_qebsm(q)) | |
250 | return qdio_do_sqbs(q, state, bufnr, count); | |
251 | ||
252 | for (i = 0; i < count; i++) { | |
253 | xchg(&q->slsb.val[bufnr], state); | |
254 | bufnr = next_buf(bufnr); | |
255 | } | |
256 | return count; | |
257 | } | |
258 | ||
259 | static inline int set_buf_state(struct qdio_q *q, int bufnr, | |
260 | unsigned char state) | |
261 | { | |
262 | return set_buf_states(q, bufnr, state, 1); | |
263 | } | |
264 | ||
265 | /* set slsb states to initial state */ | |
266 | void qdio_init_buf_states(struct qdio_irq *irq_ptr) | |
267 | { | |
268 | struct qdio_q *q; | |
269 | int i; | |
270 | ||
271 | for_each_input_queue(irq_ptr, q, i) | |
272 | set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT, | |
273 | QDIO_MAX_BUFFERS_PER_Q); | |
274 | for_each_output_queue(irq_ptr, q, i) | |
275 | set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT, | |
276 | QDIO_MAX_BUFFERS_PER_Q); | |
277 | } | |
278 | ||
60b5df2f | 279 | static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output, |
779e6e1c JG |
280 | unsigned int input) |
281 | { | |
282 | int cc; | |
283 | ||
284 | if (!need_siga_sync(q)) | |
285 | return 0; | |
286 | ||
7a0b4cbc | 287 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr); |
6486cda6 | 288 | qperf_inc(q, siga_sync); |
779e6e1c JG |
289 | |
290 | cc = do_siga_sync(q->irq_ptr->schid, output, input); | |
22f99347 JG |
291 | if (cc) |
292 | DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc); | |
779e6e1c JG |
293 | return cc; |
294 | } | |
295 | ||
60b5df2f | 296 | static inline int qdio_siga_sync_q(struct qdio_q *q) |
779e6e1c JG |
297 | { |
298 | if (q->is_input_q) | |
299 | return qdio_siga_sync(q, 0, q->mask); | |
300 | else | |
301 | return qdio_siga_sync(q, q->mask, 0); | |
302 | } | |
303 | ||
304 | static inline int qdio_siga_sync_out(struct qdio_q *q) | |
305 | { | |
306 | return qdio_siga_sync(q, ~0U, 0); | |
307 | } | |
308 | ||
309 | static inline int qdio_siga_sync_all(struct qdio_q *q) | |
310 | { | |
311 | return qdio_siga_sync(q, ~0U, ~0U); | |
312 | } | |
313 | ||
7a0b4cbc | 314 | static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit) |
779e6e1c | 315 | { |
779e6e1c | 316 | unsigned long schid; |
7a0b4cbc JG |
317 | unsigned int fc = 0; |
318 | u64 start_time = 0; | |
319 | int cc; | |
779e6e1c | 320 | |
7a0b4cbc | 321 | if (q->u.out.use_enh_siga) |
7a0f4755 | 322 | fc = 3; |
7a0b4cbc JG |
323 | |
324 | if (is_qebsm(q)) { | |
779e6e1c JG |
325 | schid = q->irq_ptr->sch_token; |
326 | fc |= 0x80; | |
327 | } | |
7a0b4cbc JG |
328 | else |
329 | schid = *((u32 *)&q->irq_ptr->schid); | |
779e6e1c | 330 | |
779e6e1c | 331 | again: |
7a0b4cbc JG |
332 | cc = do_siga_output(schid, q->mask, busy_bit, fc); |
333 | ||
334 | /* hipersocket busy condition */ | |
335 | if (*busy_bit) { | |
336 | WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2); | |
58eb27cd | 337 | |
7a0b4cbc | 338 | if (!start_time) { |
779e6e1c | 339 | start_time = get_usecs(); |
7a0b4cbc JG |
340 | goto again; |
341 | } | |
342 | if ((get_usecs() - start_time) < QDIO_BUSY_BIT_PATIENCE) | |
779e6e1c JG |
343 | goto again; |
344 | } | |
779e6e1c JG |
345 | return cc; |
346 | } | |
347 | ||
348 | static inline int qdio_siga_input(struct qdio_q *q) | |
349 | { | |
350 | int cc; | |
351 | ||
22f99347 | 352 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr); |
6486cda6 | 353 | qperf_inc(q, siga_read); |
779e6e1c JG |
354 | |
355 | cc = do_siga_input(q->irq_ptr->schid, q->mask); | |
356 | if (cc) | |
22f99347 | 357 | DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc); |
779e6e1c JG |
358 | return cc; |
359 | } | |
360 | ||
60b5df2f | 361 | static inline void qdio_sync_after_thinint(struct qdio_q *q) |
779e6e1c JG |
362 | { |
363 | if (pci_out_supported(q)) { | |
364 | if (need_siga_sync_thinint(q)) | |
365 | qdio_siga_sync_all(q); | |
366 | else if (need_siga_sync_out_thinint(q)) | |
367 | qdio_siga_sync_out(q); | |
368 | } else | |
369 | qdio_siga_sync_q(q); | |
370 | } | |
371 | ||
60b5df2f JG |
372 | int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr, |
373 | unsigned char *state) | |
374 | { | |
375 | qdio_siga_sync_q(q); | |
376 | return get_buf_states(q, bufnr, state, 1, 0); | |
377 | } | |
378 | ||
379 | static inline void qdio_stop_polling(struct qdio_q *q) | |
779e6e1c | 380 | { |
50f769df | 381 | if (!q->u.in.polling) |
779e6e1c | 382 | return; |
50f769df | 383 | |
779e6e1c | 384 | q->u.in.polling = 0; |
6486cda6 | 385 | qperf_inc(q, stop_polling); |
779e6e1c JG |
386 | |
387 | /* show the card that we are not polling anymore */ | |
50f769df | 388 | if (is_qebsm(q)) { |
e85dea0e | 389 | set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, |
50f769df JG |
390 | q->u.in.ack_count); |
391 | q->u.in.ack_count = 0; | |
392 | } else | |
e85dea0e | 393 | set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); |
779e6e1c JG |
394 | } |
395 | ||
d307297f JG |
396 | static inline void account_sbals(struct qdio_q *q, int count) |
397 | { | |
398 | int pos = 0; | |
399 | ||
400 | q->q_stats.nr_sbal_total += count; | |
401 | if (count == QDIO_MAX_BUFFERS_MASK) { | |
402 | q->q_stats.nr_sbals[7]++; | |
403 | return; | |
404 | } | |
405 | while (count >>= 1) | |
406 | pos++; | |
407 | q->q_stats.nr_sbals[pos]++; | |
408 | } | |
409 | ||
50f769df | 410 | static void announce_buffer_error(struct qdio_q *q, int count) |
779e6e1c | 411 | { |
7a0b4cbc | 412 | q->qdio_error |= QDIO_ERROR_SLSB_STATE; |
50f769df JG |
413 | |
414 | /* special handling for no target buffer empty */ | |
415 | if ((!q->is_input_q && | |
416 | (q->sbal[q->first_to_check]->element[15].flags & 0xff) == 0x10)) { | |
6486cda6 | 417 | qperf_inc(q, target_full); |
1d7e1500 | 418 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", |
50f769df JG |
419 | q->first_to_check); |
420 | return; | |
421 | } | |
422 | ||
22f99347 JG |
423 | DBF_ERROR("%4x BUF ERROR", SCH_NO(q)); |
424 | DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr); | |
50f769df | 425 | DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count); |
22f99347 JG |
426 | DBF_ERROR("F14:%2x F15:%2x", |
427 | q->sbal[q->first_to_check]->element[14].flags & 0xff, | |
428 | q->sbal[q->first_to_check]->element[15].flags & 0xff); | |
50f769df | 429 | } |
779e6e1c | 430 | |
50f769df JG |
431 | static inline void inbound_primed(struct qdio_q *q, int count) |
432 | { | |
433 | int new; | |
434 | ||
1d7e1500 | 435 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count); |
50f769df JG |
436 | |
437 | /* for QEBSM the ACK was already set by EQBS */ | |
438 | if (is_qebsm(q)) { | |
439 | if (!q->u.in.polling) { | |
440 | q->u.in.polling = 1; | |
441 | q->u.in.ack_count = count; | |
e85dea0e | 442 | q->u.in.ack_start = q->first_to_check; |
50f769df JG |
443 | return; |
444 | } | |
445 | ||
446 | /* delete the previous ACK's */ | |
e85dea0e | 447 | set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, |
50f769df JG |
448 | q->u.in.ack_count); |
449 | q->u.in.ack_count = count; | |
e85dea0e | 450 | q->u.in.ack_start = q->first_to_check; |
50f769df JG |
451 | return; |
452 | } | |
453 | ||
454 | /* | |
455 | * ACK the newest buffer. The ACK will be removed in qdio_stop_polling | |
456 | * or by the next inbound run. | |
457 | */ | |
458 | new = add_buf(q->first_to_check, count - 1); | |
459 | if (q->u.in.polling) { | |
460 | /* reset the previous ACK but first set the new one */ | |
461 | set_buf_state(q, new, SLSB_P_INPUT_ACK); | |
e85dea0e | 462 | set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); |
3fdf1e18 | 463 | } else { |
50f769df | 464 | q->u.in.polling = 1; |
3fdf1e18 | 465 | set_buf_state(q, new, SLSB_P_INPUT_ACK); |
50f769df JG |
466 | } |
467 | ||
e85dea0e | 468 | q->u.in.ack_start = new; |
50f769df JG |
469 | count--; |
470 | if (!count) | |
471 | return; | |
6541f7b6 JG |
472 | /* need to change ALL buffers to get more interrupts */ |
473 | set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count); | |
779e6e1c JG |
474 | } |
475 | ||
476 | static int get_inbound_buffer_frontier(struct qdio_q *q) | |
477 | { | |
478 | int count, stop; | |
479 | unsigned char state; | |
480 | ||
779e6e1c JG |
481 | /* |
482 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved | |
483 | * would return 0. | |
484 | */ | |
485 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); | |
486 | stop = add_buf(q->first_to_check, count); | |
487 | ||
779e6e1c JG |
488 | if (q->first_to_check == stop) |
489 | goto out; | |
490 | ||
36e3e721 JG |
491 | /* |
492 | * No siga sync here, as a PCI or we after a thin interrupt | |
493 | * already sync'ed the queues. | |
494 | */ | |
50f769df | 495 | count = get_buf_states(q, q->first_to_check, &state, count, 1); |
779e6e1c JG |
496 | if (!count) |
497 | goto out; | |
498 | ||
499 | switch (state) { | |
500 | case SLSB_P_INPUT_PRIMED: | |
50f769df | 501 | inbound_primed(q, count); |
779e6e1c | 502 | q->first_to_check = add_buf(q->first_to_check, count); |
8bcd9b04 | 503 | if (atomic_sub(count, &q->nr_buf_used) == 0) |
6486cda6 | 504 | qperf_inc(q, inbound_queue_full); |
d307297f JG |
505 | if (q->irq_ptr->perf_stat_enabled) |
506 | account_sbals(q, count); | |
36e3e721 | 507 | break; |
779e6e1c | 508 | case SLSB_P_INPUT_ERROR: |
50f769df | 509 | announce_buffer_error(q, count); |
779e6e1c JG |
510 | /* process the buffer, the upper layer will take care of it */ |
511 | q->first_to_check = add_buf(q->first_to_check, count); | |
512 | atomic_sub(count, &q->nr_buf_used); | |
d307297f JG |
513 | if (q->irq_ptr->perf_stat_enabled) |
514 | account_sbals_error(q, count); | |
779e6e1c JG |
515 | break; |
516 | case SLSB_CU_INPUT_EMPTY: | |
517 | case SLSB_P_INPUT_NOT_INIT: | |
518 | case SLSB_P_INPUT_ACK: | |
d307297f JG |
519 | if (q->irq_ptr->perf_stat_enabled) |
520 | q->q_stats.nr_sbal_nop++; | |
22f99347 | 521 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop"); |
779e6e1c JG |
522 | break; |
523 | default: | |
524 | BUG(); | |
525 | } | |
526 | out: | |
779e6e1c JG |
527 | return q->first_to_check; |
528 | } | |
529 | ||
60b5df2f | 530 | static int qdio_inbound_q_moved(struct qdio_q *q) |
779e6e1c JG |
531 | { |
532 | int bufnr; | |
533 | ||
534 | bufnr = get_inbound_buffer_frontier(q); | |
535 | ||
e85dea0e JG |
536 | if ((bufnr != q->last_move) || q->qdio_error) { |
537 | q->last_move = bufnr; | |
27d71602 | 538 | if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR) |
779e6e1c | 539 | q->u.in.timestamp = get_usecs(); |
779e6e1c JG |
540 | return 1; |
541 | } else | |
542 | return 0; | |
543 | } | |
544 | ||
9a2c160a | 545 | static inline int qdio_inbound_q_done(struct qdio_q *q) |
779e6e1c | 546 | { |
9a1ce28a | 547 | unsigned char state = 0; |
779e6e1c JG |
548 | |
549 | if (!atomic_read(&q->nr_buf_used)) | |
550 | return 1; | |
551 | ||
779e6e1c | 552 | qdio_siga_sync_q(q); |
50f769df | 553 | get_buf_state(q, q->first_to_check, &state, 0); |
9a2c160a | 554 | |
4c52228d | 555 | if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR) |
9a2c160a | 556 | /* more work coming */ |
779e6e1c JG |
557 | return 0; |
558 | ||
9a2c160a JG |
559 | if (is_thinint_irq(q->irq_ptr)) |
560 | return 1; | |
561 | ||
562 | /* don't poll under z/VM */ | |
563 | if (MACHINE_IS_VM) | |
779e6e1c JG |
564 | return 1; |
565 | ||
566 | /* | |
567 | * At this point we know, that inbound first_to_check | |
568 | * has (probably) not moved (see qdio_inbound_processing). | |
569 | */ | |
570 | if (get_usecs() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) { | |
1d7e1500 | 571 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x", |
22f99347 | 572 | q->first_to_check); |
779e6e1c | 573 | return 1; |
9a2c160a | 574 | } else |
60b5df2f | 575 | return 0; |
60b5df2f JG |
576 | } |
577 | ||
578 | static void qdio_kick_handler(struct qdio_q *q) | |
779e6e1c | 579 | { |
9c8a08d7 JG |
580 | int start = q->first_to_kick; |
581 | int end = q->first_to_check; | |
582 | int count; | |
779e6e1c JG |
583 | |
584 | if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) | |
585 | return; | |
586 | ||
9c8a08d7 JG |
587 | count = sub_buf(end, start); |
588 | ||
589 | if (q->is_input_q) { | |
6486cda6 | 590 | qperf_inc(q, inbound_handler); |
1d7e1500 | 591 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count); |
bd6e8a16 | 592 | } else { |
6486cda6 | 593 | qperf_inc(q, outbound_handler); |
1d7e1500 JG |
594 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x", |
595 | start, count); | |
bd6e8a16 | 596 | } |
9c8a08d7 JG |
597 | |
598 | q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count, | |
599 | q->irq_ptr->int_parm); | |
779e6e1c JG |
600 | |
601 | /* for the next time */ | |
9c8a08d7 | 602 | q->first_to_kick = end; |
779e6e1c JG |
603 | q->qdio_error = 0; |
604 | } | |
605 | ||
606 | static void __qdio_inbound_processing(struct qdio_q *q) | |
607 | { | |
6486cda6 | 608 | qperf_inc(q, tasklet_inbound); |
779e6e1c JG |
609 | again: |
610 | if (!qdio_inbound_q_moved(q)) | |
611 | return; | |
612 | ||
9c8a08d7 | 613 | qdio_kick_handler(q); |
779e6e1c | 614 | |
6486cda6 | 615 | if (!qdio_inbound_q_done(q)) { |
779e6e1c | 616 | /* means poll time is not yet over */ |
6486cda6 | 617 | qperf_inc(q, tasklet_inbound_resched); |
779e6e1c | 618 | goto again; |
6486cda6 | 619 | } |
779e6e1c JG |
620 | |
621 | qdio_stop_polling(q); | |
622 | /* | |
623 | * We need to check again to not lose initiative after | |
624 | * resetting the ACK state. | |
625 | */ | |
6486cda6 JG |
626 | if (!qdio_inbound_q_done(q)) { |
627 | qperf_inc(q, tasklet_inbound_resched2); | |
779e6e1c | 628 | goto again; |
6486cda6 | 629 | } |
779e6e1c JG |
630 | } |
631 | ||
779e6e1c JG |
632 | void qdio_inbound_processing(unsigned long data) |
633 | { | |
634 | struct qdio_q *q = (struct qdio_q *)data; | |
635 | __qdio_inbound_processing(q); | |
636 | } | |
637 | ||
638 | static int get_outbound_buffer_frontier(struct qdio_q *q) | |
639 | { | |
640 | int count, stop; | |
641 | unsigned char state; | |
642 | ||
643 | if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) || | |
644 | (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q))) | |
645 | qdio_siga_sync_q(q); | |
646 | ||
647 | /* | |
648 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved | |
649 | * would return 0. | |
650 | */ | |
651 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); | |
652 | stop = add_buf(q->first_to_check, count); | |
653 | ||
779e6e1c JG |
654 | if (q->first_to_check == stop) |
655 | return q->first_to_check; | |
656 | ||
50f769df | 657 | count = get_buf_states(q, q->first_to_check, &state, count, 0); |
779e6e1c JG |
658 | if (!count) |
659 | return q->first_to_check; | |
660 | ||
661 | switch (state) { | |
662 | case SLSB_P_OUTPUT_EMPTY: | |
663 | /* the adapter got it */ | |
1d7e1500 | 664 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %02x", q->nr, count); |
779e6e1c JG |
665 | |
666 | atomic_sub(count, &q->nr_buf_used); | |
667 | q->first_to_check = add_buf(q->first_to_check, count); | |
d307297f JG |
668 | if (q->irq_ptr->perf_stat_enabled) |
669 | account_sbals(q, count); | |
36e3e721 | 670 | break; |
779e6e1c | 671 | case SLSB_P_OUTPUT_ERROR: |
50f769df | 672 | announce_buffer_error(q, count); |
779e6e1c JG |
673 | /* process the buffer, the upper layer will take care of it */ |
674 | q->first_to_check = add_buf(q->first_to_check, count); | |
675 | atomic_sub(count, &q->nr_buf_used); | |
d307297f JG |
676 | if (q->irq_ptr->perf_stat_enabled) |
677 | account_sbals_error(q, count); | |
779e6e1c JG |
678 | break; |
679 | case SLSB_CU_OUTPUT_PRIMED: | |
680 | /* the adapter has not fetched the output yet */ | |
d307297f JG |
681 | if (q->irq_ptr->perf_stat_enabled) |
682 | q->q_stats.nr_sbal_nop++; | |
22f99347 | 683 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr); |
779e6e1c JG |
684 | break; |
685 | case SLSB_P_OUTPUT_NOT_INIT: | |
686 | case SLSB_P_OUTPUT_HALTED: | |
687 | break; | |
688 | default: | |
689 | BUG(); | |
690 | } | |
691 | return q->first_to_check; | |
692 | } | |
693 | ||
694 | /* all buffers processed? */ | |
695 | static inline int qdio_outbound_q_done(struct qdio_q *q) | |
696 | { | |
697 | return atomic_read(&q->nr_buf_used) == 0; | |
698 | } | |
699 | ||
700 | static inline int qdio_outbound_q_moved(struct qdio_q *q) | |
701 | { | |
702 | int bufnr; | |
703 | ||
704 | bufnr = get_outbound_buffer_frontier(q); | |
705 | ||
e85dea0e JG |
706 | if ((bufnr != q->last_move) || q->qdio_error) { |
707 | q->last_move = bufnr; | |
22f99347 | 708 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr); |
779e6e1c JG |
709 | return 1; |
710 | } else | |
711 | return 0; | |
712 | } | |
713 | ||
d303b6fd | 714 | static int qdio_kick_outbound_q(struct qdio_q *q) |
779e6e1c | 715 | { |
7a0b4cbc JG |
716 | unsigned int busy_bit; |
717 | int cc; | |
779e6e1c JG |
718 | |
719 | if (!need_siga_out(q)) | |
d303b6fd | 720 | return 0; |
779e6e1c | 721 | |
7a0b4cbc | 722 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr); |
6486cda6 | 723 | qperf_inc(q, siga_write); |
7a0b4cbc JG |
724 | |
725 | cc = qdio_siga_output(q, &busy_bit); | |
726 | switch (cc) { | |
779e6e1c | 727 | case 0: |
779e6e1c | 728 | break; |
7a0b4cbc JG |
729 | case 2: |
730 | if (busy_bit) { | |
731 | DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr); | |
d303b6fd JG |
732 | cc |= QDIO_ERROR_SIGA_BUSY; |
733 | } else | |
734 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr); | |
7a0b4cbc JG |
735 | break; |
736 | case 1: | |
737 | case 3: | |
738 | DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc); | |
7a0b4cbc | 739 | break; |
779e6e1c | 740 | } |
d303b6fd | 741 | return cc; |
779e6e1c JG |
742 | } |
743 | ||
779e6e1c JG |
744 | static void __qdio_outbound_processing(struct qdio_q *q) |
745 | { | |
6486cda6 | 746 | qperf_inc(q, tasklet_outbound); |
779e6e1c JG |
747 | BUG_ON(atomic_read(&q->nr_buf_used) < 0); |
748 | ||
749 | if (qdio_outbound_q_moved(q)) | |
9c8a08d7 | 750 | qdio_kick_handler(q); |
779e6e1c | 751 | |
c38f9608 | 752 | if (queue_type(q) == QDIO_ZFCP_QFMT) |
779e6e1c | 753 | if (!pci_out_supported(q) && !qdio_outbound_q_done(q)) |
c38f9608 | 754 | goto sched; |
779e6e1c JG |
755 | |
756 | /* bail out for HiperSockets unicast queues */ | |
757 | if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q)) | |
758 | return; | |
759 | ||
4bcb3a37 | 760 | if ((queue_type(q) == QDIO_IQDIO_QFMT) && |
c38f9608 JG |
761 | (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL) |
762 | goto sched; | |
4bcb3a37 | 763 | |
779e6e1c JG |
764 | if (q->u.out.pci_out_enabled) |
765 | return; | |
766 | ||
767 | /* | |
768 | * Now we know that queue type is either qeth without pci enabled | |
769 | * or HiperSockets multicast. Make sure buffer switch from PRIMED to | |
770 | * EMPTY is noticed and outbound_handler is called after some time. | |
771 | */ | |
772 | if (qdio_outbound_q_done(q)) | |
773 | del_timer(&q->u.out.timer); | |
6486cda6 JG |
774 | else |
775 | if (!timer_pending(&q->u.out.timer)) | |
779e6e1c | 776 | mod_timer(&q->u.out.timer, jiffies + 10 * HZ); |
c38f9608 JG |
777 | return; |
778 | ||
779 | sched: | |
780 | if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) | |
781 | return; | |
782 | tasklet_schedule(&q->tasklet); | |
779e6e1c JG |
783 | } |
784 | ||
785 | /* outbound tasklet */ | |
786 | void qdio_outbound_processing(unsigned long data) | |
787 | { | |
788 | struct qdio_q *q = (struct qdio_q *)data; | |
789 | __qdio_outbound_processing(q); | |
790 | } | |
791 | ||
792 | void qdio_outbound_timer(unsigned long data) | |
793 | { | |
794 | struct qdio_q *q = (struct qdio_q *)data; | |
c38f9608 JG |
795 | |
796 | if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) | |
797 | return; | |
779e6e1c JG |
798 | tasklet_schedule(&q->tasklet); |
799 | } | |
800 | ||
60b5df2f | 801 | static inline void qdio_check_outbound_after_thinint(struct qdio_q *q) |
779e6e1c JG |
802 | { |
803 | struct qdio_q *out; | |
804 | int i; | |
805 | ||
806 | if (!pci_out_supported(q)) | |
807 | return; | |
808 | ||
809 | for_each_output_queue(q->irq_ptr, out, i) | |
810 | if (!qdio_outbound_q_done(out)) | |
811 | tasklet_schedule(&out->tasklet); | |
812 | } | |
813 | ||
60b5df2f JG |
814 | static void __tiqdio_inbound_processing(struct qdio_q *q) |
815 | { | |
6486cda6 | 816 | qperf_inc(q, tasklet_inbound); |
60b5df2f JG |
817 | qdio_sync_after_thinint(q); |
818 | ||
819 | /* | |
820 | * The interrupt could be caused by a PCI request. Check the | |
821 | * PCI capable outbound queues. | |
822 | */ | |
823 | qdio_check_outbound_after_thinint(q); | |
824 | ||
825 | if (!qdio_inbound_q_moved(q)) | |
826 | return; | |
827 | ||
828 | qdio_kick_handler(q); | |
829 | ||
9a2c160a | 830 | if (!qdio_inbound_q_done(q)) { |
6486cda6 | 831 | qperf_inc(q, tasklet_inbound_resched); |
e2910bcf | 832 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) { |
60b5df2f | 833 | tasklet_schedule(&q->tasklet); |
e2910bcf JG |
834 | return; |
835 | } | |
60b5df2f JG |
836 | } |
837 | ||
838 | qdio_stop_polling(q); | |
839 | /* | |
840 | * We need to check again to not lose initiative after | |
841 | * resetting the ACK state. | |
842 | */ | |
9a2c160a | 843 | if (!qdio_inbound_q_done(q)) { |
6486cda6 | 844 | qperf_inc(q, tasklet_inbound_resched2); |
60b5df2f JG |
845 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) |
846 | tasklet_schedule(&q->tasklet); | |
847 | } | |
848 | } | |
849 | ||
850 | void tiqdio_inbound_processing(unsigned long data) | |
851 | { | |
852 | struct qdio_q *q = (struct qdio_q *)data; | |
853 | __tiqdio_inbound_processing(q); | |
854 | } | |
855 | ||
779e6e1c JG |
856 | static inline void qdio_set_state(struct qdio_irq *irq_ptr, |
857 | enum qdio_irq_states state) | |
858 | { | |
22f99347 | 859 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state); |
779e6e1c JG |
860 | |
861 | irq_ptr->state = state; | |
862 | mb(); | |
863 | } | |
864 | ||
22f99347 | 865 | static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb) |
779e6e1c | 866 | { |
779e6e1c | 867 | if (irb->esw.esw0.erw.cons) { |
22f99347 JG |
868 | DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no); |
869 | DBF_ERROR_HEX(irb, 64); | |
870 | DBF_ERROR_HEX(irb->ecw, 64); | |
779e6e1c JG |
871 | } |
872 | } | |
873 | ||
874 | /* PCI interrupt handler */ | |
875 | static void qdio_int_handler_pci(struct qdio_irq *irq_ptr) | |
876 | { | |
877 | int i; | |
878 | struct qdio_q *q; | |
879 | ||
c38f9608 JG |
880 | if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) |
881 | return; | |
882 | ||
779e6e1c JG |
883 | for_each_input_queue(irq_ptr, q, i) |
884 | tasklet_schedule(&q->tasklet); | |
885 | ||
886 | if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED)) | |
887 | return; | |
888 | ||
889 | for_each_output_queue(irq_ptr, q, i) { | |
890 | if (qdio_outbound_q_done(q)) | |
891 | continue; | |
892 | ||
893 | if (!siga_syncs_out_pci(q)) | |
894 | qdio_siga_sync_q(q); | |
895 | ||
896 | tasklet_schedule(&q->tasklet); | |
897 | } | |
898 | } | |
899 | ||
900 | static void qdio_handle_activate_check(struct ccw_device *cdev, | |
901 | unsigned long intparm, int cstat, int dstat) | |
902 | { | |
903 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
904 | struct qdio_q *q; | |
779e6e1c | 905 | |
22f99347 JG |
906 | DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no); |
907 | DBF_ERROR("intp :%lx", intparm); | |
908 | DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); | |
779e6e1c JG |
909 | |
910 | if (irq_ptr->nr_input_qs) { | |
911 | q = irq_ptr->input_qs[0]; | |
912 | } else if (irq_ptr->nr_output_qs) { | |
913 | q = irq_ptr->output_qs[0]; | |
914 | } else { | |
915 | dump_stack(); | |
916 | goto no_handler; | |
917 | } | |
918 | q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION, | |
919 | 0, -1, -1, irq_ptr->int_parm); | |
920 | no_handler: | |
921 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); | |
922 | } | |
923 | ||
4c575423 JG |
924 | static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat, |
925 | int dstat) | |
779e6e1c JG |
926 | { |
927 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
928 | ||
4c575423 | 929 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq"); |
779e6e1c | 930 | |
4c575423 | 931 | if (cstat) |
779e6e1c | 932 | goto error; |
4c575423 | 933 | if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END)) |
779e6e1c | 934 | goto error; |
4c575423 JG |
935 | if (!(dstat & DEV_STAT_DEV_END)) |
936 | goto error; | |
937 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED); | |
938 | return; | |
939 | ||
779e6e1c | 940 | error: |
22f99347 JG |
941 | DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no); |
942 | DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); | |
779e6e1c | 943 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); |
779e6e1c JG |
944 | } |
945 | ||
946 | /* qdio interrupt handler */ | |
947 | void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm, | |
948 | struct irb *irb) | |
949 | { | |
950 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
951 | int cstat, dstat; | |
779e6e1c | 952 | |
779e6e1c | 953 | if (!intparm || !irq_ptr) { |
22f99347 | 954 | DBF_ERROR("qint:%4x", cdev->private->schid.sch_no); |
779e6e1c JG |
955 | return; |
956 | } | |
957 | ||
958 | if (IS_ERR(irb)) { | |
959 | switch (PTR_ERR(irb)) { | |
960 | case -EIO: | |
22f99347 | 961 | DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no); |
75cb71f3 JG |
962 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); |
963 | wake_up(&cdev->private->wait_q); | |
779e6e1c JG |
964 | return; |
965 | default: | |
966 | WARN_ON(1); | |
967 | return; | |
968 | } | |
969 | } | |
22f99347 | 970 | qdio_irq_check_sense(irq_ptr, irb); |
779e6e1c JG |
971 | cstat = irb->scsw.cmd.cstat; |
972 | dstat = irb->scsw.cmd.dstat; | |
973 | ||
974 | switch (irq_ptr->state) { | |
975 | case QDIO_IRQ_STATE_INACTIVE: | |
976 | qdio_establish_handle_irq(cdev, cstat, dstat); | |
977 | break; | |
779e6e1c JG |
978 | case QDIO_IRQ_STATE_CLEANUP: |
979 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
980 | break; | |
779e6e1c JG |
981 | case QDIO_IRQ_STATE_ESTABLISHED: |
982 | case QDIO_IRQ_STATE_ACTIVE: | |
983 | if (cstat & SCHN_STAT_PCI) { | |
984 | qdio_int_handler_pci(irq_ptr); | |
779e6e1c JG |
985 | return; |
986 | } | |
4c575423 | 987 | if (cstat || dstat) |
779e6e1c JG |
988 | qdio_handle_activate_check(cdev, intparm, cstat, |
989 | dstat); | |
4c575423 | 990 | break; |
959153d3 JG |
991 | case QDIO_IRQ_STATE_STOPPED: |
992 | break; | |
779e6e1c JG |
993 | default: |
994 | WARN_ON(1); | |
995 | } | |
996 | wake_up(&cdev->private->wait_q); | |
997 | } | |
998 | ||
999 | /** | |
1000 | * qdio_get_ssqd_desc - get qdio subchannel description | |
1001 | * @cdev: ccw device to get description for | |
bbd50e17 | 1002 | * @data: where to store the ssqd |
779e6e1c | 1003 | * |
bbd50e17 JG |
1004 | * Returns 0 or an error code. The results of the chsc are stored in the |
1005 | * specified structure. | |
779e6e1c | 1006 | */ |
bbd50e17 JG |
1007 | int qdio_get_ssqd_desc(struct ccw_device *cdev, |
1008 | struct qdio_ssqd_desc *data) | |
779e6e1c | 1009 | { |
779e6e1c | 1010 | |
bbd50e17 JG |
1011 | if (!cdev || !cdev->private) |
1012 | return -EINVAL; | |
1013 | ||
22f99347 | 1014 | DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no); |
bbd50e17 | 1015 | return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data); |
779e6e1c JG |
1016 | } |
1017 | EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc); | |
1018 | ||
1019 | /** | |
1020 | * qdio_cleanup - shutdown queues and free data structures | |
1021 | * @cdev: associated ccw device | |
1022 | * @how: use halt or clear to shutdown | |
1023 | * | |
700e982f JG |
1024 | * This function calls qdio_shutdown() for @cdev with method @how. |
1025 | * and qdio_free(). The qdio_free() return value is ignored since | |
1026 | * !irq_ptr is already checked. | |
779e6e1c JG |
1027 | */ |
1028 | int qdio_cleanup(struct ccw_device *cdev, int how) | |
1029 | { | |
22f99347 | 1030 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
779e6e1c JG |
1031 | int rc; |
1032 | ||
779e6e1c JG |
1033 | if (!irq_ptr) |
1034 | return -ENODEV; | |
1035 | ||
779e6e1c | 1036 | rc = qdio_shutdown(cdev, how); |
700e982f JG |
1037 | |
1038 | qdio_free(cdev); | |
779e6e1c JG |
1039 | return rc; |
1040 | } | |
1041 | EXPORT_SYMBOL_GPL(qdio_cleanup); | |
1042 | ||
1043 | static void qdio_shutdown_queues(struct ccw_device *cdev) | |
1044 | { | |
1045 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1046 | struct qdio_q *q; | |
1047 | int i; | |
1048 | ||
1049 | for_each_input_queue(irq_ptr, q, i) | |
c38f9608 | 1050 | tasklet_kill(&q->tasklet); |
779e6e1c JG |
1051 | |
1052 | for_each_output_queue(irq_ptr, q, i) { | |
779e6e1c | 1053 | del_timer(&q->u.out.timer); |
c38f9608 | 1054 | tasklet_kill(&q->tasklet); |
779e6e1c JG |
1055 | } |
1056 | } | |
1057 | ||
1058 | /** | |
1059 | * qdio_shutdown - shut down a qdio subchannel | |
1060 | * @cdev: associated ccw device | |
1061 | * @how: use halt or clear to shutdown | |
1062 | */ | |
1063 | int qdio_shutdown(struct ccw_device *cdev, int how) | |
1064 | { | |
22f99347 | 1065 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
779e6e1c JG |
1066 | int rc; |
1067 | unsigned long flags; | |
779e6e1c | 1068 | |
779e6e1c JG |
1069 | if (!irq_ptr) |
1070 | return -ENODEV; | |
1071 | ||
b4547402 | 1072 | BUG_ON(irqs_disabled()); |
22f99347 JG |
1073 | DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no); |
1074 | ||
779e6e1c JG |
1075 | mutex_lock(&irq_ptr->setup_mutex); |
1076 | /* | |
1077 | * Subchannel was already shot down. We cannot prevent being called | |
1078 | * twice since cio may trigger a shutdown asynchronously. | |
1079 | */ | |
1080 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { | |
1081 | mutex_unlock(&irq_ptr->setup_mutex); | |
1082 | return 0; | |
1083 | } | |
1084 | ||
c38f9608 JG |
1085 | /* |
1086 | * Indicate that the device is going down. Scheduling the queue | |
1087 | * tasklets is forbidden from here on. | |
1088 | */ | |
1089 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); | |
1090 | ||
779e6e1c JG |
1091 | tiqdio_remove_input_queues(irq_ptr); |
1092 | qdio_shutdown_queues(cdev); | |
1093 | qdio_shutdown_debug_entries(irq_ptr, cdev); | |
1094 | ||
1095 | /* cleanup subchannel */ | |
1096 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1097 | ||
1098 | if (how & QDIO_FLAG_CLEANUP_USING_CLEAR) | |
1099 | rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP); | |
1100 | else | |
1101 | /* default behaviour is halt */ | |
1102 | rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP); | |
1103 | if (rc) { | |
22f99347 JG |
1104 | DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no); |
1105 | DBF_ERROR("rc:%4d", rc); | |
779e6e1c JG |
1106 | goto no_cleanup; |
1107 | } | |
1108 | ||
1109 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP); | |
1110 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1111 | wait_event_interruptible_timeout(cdev->private->wait_q, | |
1112 | irq_ptr->state == QDIO_IRQ_STATE_INACTIVE || | |
1113 | irq_ptr->state == QDIO_IRQ_STATE_ERR, | |
1114 | 10 * HZ); | |
1115 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1116 | ||
1117 | no_cleanup: | |
1118 | qdio_shutdown_thinint(irq_ptr); | |
1119 | ||
1120 | /* restore interrupt handler */ | |
1121 | if ((void *)cdev->handler == (void *)qdio_int_handler) | |
1122 | cdev->handler = irq_ptr->orig_handler; | |
1123 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1124 | ||
1125 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1126 | mutex_unlock(&irq_ptr->setup_mutex); | |
779e6e1c JG |
1127 | if (rc) |
1128 | return rc; | |
1129 | return 0; | |
1130 | } | |
1131 | EXPORT_SYMBOL_GPL(qdio_shutdown); | |
1132 | ||
1133 | /** | |
1134 | * qdio_free - free data structures for a qdio subchannel | |
1135 | * @cdev: associated ccw device | |
1136 | */ | |
1137 | int qdio_free(struct ccw_device *cdev) | |
1138 | { | |
22f99347 | 1139 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
58eb27cd | 1140 | |
779e6e1c JG |
1141 | if (!irq_ptr) |
1142 | return -ENODEV; | |
1143 | ||
22f99347 | 1144 | DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no); |
779e6e1c | 1145 | mutex_lock(&irq_ptr->setup_mutex); |
22f99347 JG |
1146 | |
1147 | if (irq_ptr->debug_area != NULL) { | |
1148 | debug_unregister(irq_ptr->debug_area); | |
1149 | irq_ptr->debug_area = NULL; | |
1150 | } | |
779e6e1c JG |
1151 | cdev->private->qdio_data = NULL; |
1152 | mutex_unlock(&irq_ptr->setup_mutex); | |
1153 | ||
1154 | qdio_release_memory(irq_ptr); | |
1155 | return 0; | |
1156 | } | |
1157 | EXPORT_SYMBOL_GPL(qdio_free); | |
1158 | ||
1159 | /** | |
1160 | * qdio_initialize - allocate and establish queues for a qdio subchannel | |
1161 | * @init_data: initialization data | |
1162 | * | |
1163 | * This function first allocates queues via qdio_allocate() and on success | |
1164 | * establishes them via qdio_establish(). | |
1165 | */ | |
1166 | int qdio_initialize(struct qdio_initialize *init_data) | |
1167 | { | |
1168 | int rc; | |
779e6e1c JG |
1169 | |
1170 | rc = qdio_allocate(init_data); | |
1171 | if (rc) | |
1172 | return rc; | |
1173 | ||
1174 | rc = qdio_establish(init_data); | |
1175 | if (rc) | |
1176 | qdio_free(init_data->cdev); | |
1177 | return rc; | |
1178 | } | |
1179 | EXPORT_SYMBOL_GPL(qdio_initialize); | |
1180 | ||
1181 | /** | |
1182 | * qdio_allocate - allocate qdio queues and associated data | |
1183 | * @init_data: initialization data | |
1184 | */ | |
1185 | int qdio_allocate(struct qdio_initialize *init_data) | |
1186 | { | |
1187 | struct qdio_irq *irq_ptr; | |
779e6e1c | 1188 | |
22f99347 | 1189 | DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no); |
779e6e1c JG |
1190 | |
1191 | if ((init_data->no_input_qs && !init_data->input_handler) || | |
1192 | (init_data->no_output_qs && !init_data->output_handler)) | |
1193 | return -EINVAL; | |
1194 | ||
1195 | if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) || | |
1196 | (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)) | |
1197 | return -EINVAL; | |
1198 | ||
1199 | if ((!init_data->input_sbal_addr_array) || | |
1200 | (!init_data->output_sbal_addr_array)) | |
1201 | return -EINVAL; | |
1202 | ||
779e6e1c JG |
1203 | /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */ |
1204 | irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
1205 | if (!irq_ptr) | |
1206 | goto out_err; | |
779e6e1c JG |
1207 | |
1208 | mutex_init(&irq_ptr->setup_mutex); | |
22f99347 | 1209 | qdio_allocate_dbf(init_data, irq_ptr); |
779e6e1c JG |
1210 | |
1211 | /* | |
1212 | * Allocate a page for the chsc calls in qdio_establish. | |
1213 | * Must be pre-allocated since a zfcp recovery will call | |
1214 | * qdio_establish. In case of low memory and swap on a zfcp disk | |
1215 | * we may not be able to allocate memory otherwise. | |
1216 | */ | |
1217 | irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL); | |
1218 | if (!irq_ptr->chsc_page) | |
1219 | goto out_rel; | |
1220 | ||
1221 | /* qdr is used in ccw1.cda which is u32 */ | |
3b8e3004 | 1222 | irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
779e6e1c JG |
1223 | if (!irq_ptr->qdr) |
1224 | goto out_rel; | |
1225 | WARN_ON((unsigned long)irq_ptr->qdr & 0xfff); | |
1226 | ||
779e6e1c JG |
1227 | if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs, |
1228 | init_data->no_output_qs)) | |
1229 | goto out_rel; | |
1230 | ||
1231 | init_data->cdev->private->qdio_data = irq_ptr; | |
1232 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1233 | return 0; | |
1234 | out_rel: | |
1235 | qdio_release_memory(irq_ptr); | |
1236 | out_err: | |
1237 | return -ENOMEM; | |
1238 | } | |
1239 | EXPORT_SYMBOL_GPL(qdio_allocate); | |
1240 | ||
1241 | /** | |
1242 | * qdio_establish - establish queues on a qdio subchannel | |
1243 | * @init_data: initialization data | |
1244 | */ | |
1245 | int qdio_establish(struct qdio_initialize *init_data) | |
1246 | { | |
779e6e1c JG |
1247 | struct qdio_irq *irq_ptr; |
1248 | struct ccw_device *cdev = init_data->cdev; | |
1249 | unsigned long saveflags; | |
1250 | int rc; | |
1251 | ||
22f99347 | 1252 | DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no); |
58eb27cd | 1253 | |
779e6e1c JG |
1254 | irq_ptr = cdev->private->qdio_data; |
1255 | if (!irq_ptr) | |
1256 | return -ENODEV; | |
1257 | ||
1258 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1259 | return -EINVAL; | |
1260 | ||
779e6e1c JG |
1261 | mutex_lock(&irq_ptr->setup_mutex); |
1262 | qdio_setup_irq(init_data); | |
1263 | ||
1264 | rc = qdio_establish_thinint(irq_ptr); | |
1265 | if (rc) { | |
1266 | mutex_unlock(&irq_ptr->setup_mutex); | |
1267 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1268 | return rc; | |
1269 | } | |
1270 | ||
1271 | /* establish q */ | |
1272 | irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd; | |
1273 | irq_ptr->ccw.flags = CCW_FLAG_SLI; | |
1274 | irq_ptr->ccw.count = irq_ptr->equeue.count; | |
1275 | irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr); | |
1276 | ||
1277 | spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); | |
1278 | ccw_device_set_options_mask(cdev, 0); | |
1279 | ||
1280 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0); | |
1281 | if (rc) { | |
22f99347 JG |
1282 | DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no); |
1283 | DBF_ERROR("rc:%4x", rc); | |
779e6e1c JG |
1284 | } |
1285 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); | |
1286 | ||
1287 | if (rc) { | |
1288 | mutex_unlock(&irq_ptr->setup_mutex); | |
1289 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1290 | return rc; | |
1291 | } | |
1292 | ||
1293 | wait_event_interruptible_timeout(cdev->private->wait_q, | |
1294 | irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED || | |
1295 | irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ); | |
1296 | ||
1297 | if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) { | |
1298 | mutex_unlock(&irq_ptr->setup_mutex); | |
1299 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1300 | return -EIO; | |
1301 | } | |
1302 | ||
1303 | qdio_setup_ssqd_info(irq_ptr); | |
22f99347 JG |
1304 | DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc); |
1305 | DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac); | |
779e6e1c JG |
1306 | |
1307 | /* qebsm is now setup if available, initialize buffer states */ | |
1308 | qdio_init_buf_states(irq_ptr); | |
1309 | ||
1310 | mutex_unlock(&irq_ptr->setup_mutex); | |
1311 | qdio_print_subchannel_info(irq_ptr, cdev); | |
1312 | qdio_setup_debug_entries(irq_ptr, cdev); | |
1313 | return 0; | |
1314 | } | |
1315 | EXPORT_SYMBOL_GPL(qdio_establish); | |
1316 | ||
1317 | /** | |
1318 | * qdio_activate - activate queues on a qdio subchannel | |
1319 | * @cdev: associated cdev | |
1320 | */ | |
1321 | int qdio_activate(struct ccw_device *cdev) | |
1322 | { | |
1323 | struct qdio_irq *irq_ptr; | |
1324 | int rc; | |
1325 | unsigned long saveflags; | |
779e6e1c | 1326 | |
22f99347 | 1327 | DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no); |
58eb27cd | 1328 | |
779e6e1c JG |
1329 | irq_ptr = cdev->private->qdio_data; |
1330 | if (!irq_ptr) | |
1331 | return -ENODEV; | |
1332 | ||
1333 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1334 | return -EINVAL; | |
1335 | ||
1336 | mutex_lock(&irq_ptr->setup_mutex); | |
1337 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { | |
1338 | rc = -EBUSY; | |
1339 | goto out; | |
1340 | } | |
1341 | ||
779e6e1c JG |
1342 | irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd; |
1343 | irq_ptr->ccw.flags = CCW_FLAG_SLI; | |
1344 | irq_ptr->ccw.count = irq_ptr->aqueue.count; | |
1345 | irq_ptr->ccw.cda = 0; | |
1346 | ||
1347 | spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); | |
1348 | ccw_device_set_options(cdev, CCWDEV_REPORT_ALL); | |
1349 | ||
1350 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE, | |
1351 | 0, DOIO_DENY_PREFETCH); | |
1352 | if (rc) { | |
22f99347 JG |
1353 | DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no); |
1354 | DBF_ERROR("rc:%4x", rc); | |
779e6e1c JG |
1355 | } |
1356 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); | |
1357 | ||
1358 | if (rc) | |
1359 | goto out; | |
1360 | ||
1361 | if (is_thinint_irq(irq_ptr)) | |
1362 | tiqdio_add_input_queues(irq_ptr); | |
1363 | ||
1364 | /* wait for subchannel to become active */ | |
1365 | msleep(5); | |
1366 | ||
1367 | switch (irq_ptr->state) { | |
1368 | case QDIO_IRQ_STATE_STOPPED: | |
1369 | case QDIO_IRQ_STATE_ERR: | |
e4c14e20 JG |
1370 | rc = -EIO; |
1371 | break; | |
779e6e1c JG |
1372 | default: |
1373 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE); | |
1374 | rc = 0; | |
1375 | } | |
1376 | out: | |
1377 | mutex_unlock(&irq_ptr->setup_mutex); | |
1378 | return rc; | |
1379 | } | |
1380 | EXPORT_SYMBOL_GPL(qdio_activate); | |
1381 | ||
1382 | static inline int buf_in_between(int bufnr, int start, int count) | |
1383 | { | |
1384 | int end = add_buf(start, count); | |
1385 | ||
1386 | if (end > start) { | |
1387 | if (bufnr >= start && bufnr < end) | |
1388 | return 1; | |
1389 | else | |
1390 | return 0; | |
1391 | } | |
1392 | ||
1393 | /* wrap-around case */ | |
1394 | if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) || | |
1395 | (bufnr < end)) | |
1396 | return 1; | |
1397 | else | |
1398 | return 0; | |
1399 | } | |
1400 | ||
1401 | /** | |
1402 | * handle_inbound - reset processed input buffers | |
1403 | * @q: queue containing the buffers | |
1404 | * @callflags: flags | |
1405 | * @bufnr: first buffer to process | |
1406 | * @count: how many buffers are emptied | |
1407 | */ | |
d303b6fd JG |
1408 | static int handle_inbound(struct qdio_q *q, unsigned int callflags, |
1409 | int bufnr, int count) | |
779e6e1c | 1410 | { |
d303b6fd | 1411 | int used, diff; |
779e6e1c | 1412 | |
6486cda6 JG |
1413 | qperf_inc(q, inbound_call); |
1414 | ||
50f769df JG |
1415 | if (!q->u.in.polling) |
1416 | goto set; | |
1417 | ||
1418 | /* protect against stop polling setting an ACK for an emptied slsb */ | |
1419 | if (count == QDIO_MAX_BUFFERS_PER_Q) { | |
1420 | /* overwriting everything, just delete polling status */ | |
1421 | q->u.in.polling = 0; | |
1422 | q->u.in.ack_count = 0; | |
1423 | goto set; | |
e85dea0e | 1424 | } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) { |
50f769df | 1425 | if (is_qebsm(q)) { |
e85dea0e | 1426 | /* partial overwrite, just update ack_start */ |
50f769df | 1427 | diff = add_buf(bufnr, count); |
e85dea0e | 1428 | diff = sub_buf(diff, q->u.in.ack_start); |
50f769df JG |
1429 | q->u.in.ack_count -= diff; |
1430 | if (q->u.in.ack_count <= 0) { | |
1431 | q->u.in.polling = 0; | |
1432 | q->u.in.ack_count = 0; | |
50f769df JG |
1433 | goto set; |
1434 | } | |
e85dea0e | 1435 | q->u.in.ack_start = add_buf(q->u.in.ack_start, diff); |
50f769df JG |
1436 | } |
1437 | else | |
1438 | /* the only ACK will be deleted, so stop polling */ | |
779e6e1c | 1439 | q->u.in.polling = 0; |
50f769df | 1440 | } |
779e6e1c | 1441 | |
50f769df | 1442 | set: |
779e6e1c | 1443 | count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count); |
779e6e1c JG |
1444 | |
1445 | used = atomic_add_return(count, &q->nr_buf_used) - count; | |
1446 | BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q); | |
1447 | ||
1448 | /* no need to signal as long as the adapter had free buffers */ | |
1449 | if (used) | |
d303b6fd | 1450 | return 0; |
779e6e1c | 1451 | |
d303b6fd JG |
1452 | if (need_siga_in(q)) |
1453 | return qdio_siga_input(q); | |
1454 | return 0; | |
779e6e1c JG |
1455 | } |
1456 | ||
1457 | /** | |
1458 | * handle_outbound - process filled outbound buffers | |
1459 | * @q: queue containing the buffers | |
1460 | * @callflags: flags | |
1461 | * @bufnr: first buffer to process | |
1462 | * @count: how many buffers are filled | |
1463 | */ | |
d303b6fd JG |
1464 | static int handle_outbound(struct qdio_q *q, unsigned int callflags, |
1465 | int bufnr, int count) | |
779e6e1c JG |
1466 | { |
1467 | unsigned char state; | |
d303b6fd | 1468 | int used, rc = 0; |
779e6e1c | 1469 | |
6486cda6 | 1470 | qperf_inc(q, outbound_call); |
779e6e1c JG |
1471 | |
1472 | count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count); | |
1473 | used = atomic_add_return(count, &q->nr_buf_used); | |
1474 | BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q); | |
1475 | ||
6486cda6 | 1476 | if (callflags & QDIO_FLAG_PCI_OUT) { |
779e6e1c | 1477 | q->u.out.pci_out_enabled = 1; |
6486cda6 JG |
1478 | qperf_inc(q, pci_request_int); |
1479 | } | |
779e6e1c JG |
1480 | else |
1481 | q->u.out.pci_out_enabled = 0; | |
1482 | ||
1483 | if (queue_type(q) == QDIO_IQDIO_QFMT) { | |
1484 | if (multicast_outbound(q)) | |
d303b6fd | 1485 | rc = qdio_kick_outbound_q(q); |
779e6e1c | 1486 | else |
7a0f4755 KDW |
1487 | if ((q->irq_ptr->ssqd_desc.mmwc > 1) && |
1488 | (count > 1) && | |
1489 | (count <= q->irq_ptr->ssqd_desc.mmwc)) { | |
1490 | /* exploit enhanced SIGA */ | |
1491 | q->u.out.use_enh_siga = 1; | |
d303b6fd | 1492 | rc = qdio_kick_outbound_q(q); |
7a0f4755 KDW |
1493 | } else { |
1494 | /* | |
1495 | * One siga-w per buffer required for unicast | |
1496 | * HiperSockets. | |
1497 | */ | |
1498 | q->u.out.use_enh_siga = 0; | |
d303b6fd JG |
1499 | while (count--) { |
1500 | rc = qdio_kick_outbound_q(q); | |
1501 | if (rc) | |
1502 | goto out; | |
1503 | } | |
7a0f4755 | 1504 | } |
779e6e1c JG |
1505 | goto out; |
1506 | } | |
1507 | ||
1508 | if (need_siga_sync(q)) { | |
1509 | qdio_siga_sync_q(q); | |
1510 | goto out; | |
1511 | } | |
1512 | ||
1513 | /* try to fast requeue buffers */ | |
50f769df | 1514 | get_buf_state(q, prev_buf(bufnr), &state, 0); |
779e6e1c | 1515 | if (state != SLSB_CU_OUTPUT_PRIMED) |
d303b6fd | 1516 | rc = qdio_kick_outbound_q(q); |
1d7e1500 | 1517 | else |
6486cda6 | 1518 | qperf_inc(q, fast_requeue); |
1d7e1500 | 1519 | |
779e6e1c | 1520 | out: |
779e6e1c | 1521 | tasklet_schedule(&q->tasklet); |
d303b6fd | 1522 | return rc; |
779e6e1c JG |
1523 | } |
1524 | ||
1525 | /** | |
1526 | * do_QDIO - process input or output buffers | |
1527 | * @cdev: associated ccw_device for the qdio subchannel | |
1528 | * @callflags: input or output and special flags from the program | |
1529 | * @q_nr: queue number | |
1530 | * @bufnr: buffer number | |
1531 | * @count: how many buffers to process | |
1532 | */ | |
1533 | int do_QDIO(struct ccw_device *cdev, unsigned int callflags, | |
6618241b | 1534 | int q_nr, unsigned int bufnr, unsigned int count) |
779e6e1c JG |
1535 | { |
1536 | struct qdio_irq *irq_ptr; | |
779e6e1c | 1537 | |
6618241b | 1538 | if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q) |
779e6e1c JG |
1539 | return -EINVAL; |
1540 | ||
779e6e1c JG |
1541 | irq_ptr = cdev->private->qdio_data; |
1542 | if (!irq_ptr) | |
1543 | return -ENODEV; | |
1544 | ||
1d7e1500 JG |
1545 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, |
1546 | "do%02x b:%02x c:%02x", callflags, bufnr, count); | |
779e6e1c JG |
1547 | |
1548 | if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE) | |
1549 | return -EBUSY; | |
1550 | ||
1551 | if (callflags & QDIO_FLAG_SYNC_INPUT) | |
d303b6fd JG |
1552 | return handle_inbound(irq_ptr->input_qs[q_nr], |
1553 | callflags, bufnr, count); | |
779e6e1c | 1554 | else if (callflags & QDIO_FLAG_SYNC_OUTPUT) |
d303b6fd JG |
1555 | return handle_outbound(irq_ptr->output_qs[q_nr], |
1556 | callflags, bufnr, count); | |
1557 | return -EINVAL; | |
779e6e1c JG |
1558 | } |
1559 | EXPORT_SYMBOL_GPL(do_QDIO); | |
1560 | ||
1561 | static int __init init_QDIO(void) | |
1562 | { | |
1563 | int rc; | |
1564 | ||
1565 | rc = qdio_setup_init(); | |
1566 | if (rc) | |
1567 | return rc; | |
1568 | rc = tiqdio_allocate_memory(); | |
1569 | if (rc) | |
1570 | goto out_cache; | |
1571 | rc = qdio_debug_init(); | |
1572 | if (rc) | |
1573 | goto out_ti; | |
779e6e1c JG |
1574 | rc = tiqdio_register_thinints(); |
1575 | if (rc) | |
6486cda6 | 1576 | goto out_debug; |
779e6e1c JG |
1577 | return 0; |
1578 | ||
779e6e1c JG |
1579 | out_debug: |
1580 | qdio_debug_exit(); | |
1581 | out_ti: | |
1582 | tiqdio_free_memory(); | |
1583 | out_cache: | |
1584 | qdio_setup_exit(); | |
1585 | return rc; | |
1586 | } | |
1587 | ||
1588 | static void __exit exit_QDIO(void) | |
1589 | { | |
1590 | tiqdio_unregister_thinints(); | |
1591 | tiqdio_free_memory(); | |
779e6e1c JG |
1592 | qdio_debug_exit(); |
1593 | qdio_setup_exit(); | |
1594 | } | |
1595 | ||
1596 | module_init(init_QDIO); | |
1597 | module_exit(exit_QDIO); |