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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> | |
16 | #include <linux/gfp.h> | |
17 | #include <linux/io.h> | |
18 | #include <linux/atomic.h> | |
19 | #include <asm/debug.h> | |
20 | #include <asm/qdio.h> | |
21 | #include <asm/ipl.h> | |
22 | ||
23 | #include "cio.h" | |
24 | #include "css.h" | |
25 | #include "device.h" | |
26 | #include "qdio.h" | |
27 | #include "qdio_debug.h" | |
28 | ||
29 | MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\ | |
30 | "Jan Glauber <jang@linux.vnet.ibm.com>"); | |
31 | MODULE_DESCRIPTION("QDIO base support"); | |
32 | MODULE_LICENSE("GPL"); | |
33 | ||
34 | static inline int do_siga_sync(unsigned long schid, | |
35 | unsigned int out_mask, unsigned int in_mask, | |
36 | unsigned int fc) | |
37 | { | |
38 | register unsigned long __fc asm ("0") = fc; | |
39 | register unsigned long __schid asm ("1") = schid; | |
40 | register unsigned long out asm ("2") = out_mask; | |
41 | register unsigned long in asm ("3") = in_mask; | |
42 | int cc; | |
43 | ||
44 | asm volatile( | |
45 | " siga 0\n" | |
46 | " ipm %0\n" | |
47 | " srl %0,28\n" | |
48 | : "=d" (cc) | |
49 | : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc"); | |
50 | return cc; | |
51 | } | |
52 | ||
53 | static inline int do_siga_input(unsigned long schid, unsigned int mask, | |
54 | unsigned int fc) | |
55 | { | |
56 | register unsigned long __fc asm ("0") = fc; | |
57 | register unsigned long __schid asm ("1") = schid; | |
58 | register unsigned long __mask asm ("2") = mask; | |
59 | int cc; | |
60 | ||
61 | asm volatile( | |
62 | " siga 0\n" | |
63 | " ipm %0\n" | |
64 | " srl %0,28\n" | |
65 | : "=d" (cc) | |
66 | : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory"); | |
67 | return cc; | |
68 | } | |
69 | ||
70 | /** | |
71 | * do_siga_output - perform SIGA-w/wt function | |
72 | * @schid: subchannel id or in case of QEBSM the subchannel token | |
73 | * @mask: which output queues to process | |
74 | * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer | |
75 | * @fc: function code to perform | |
76 | * | |
77 | * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION. | |
78 | * Note: For IQDC unicast queues only the highest priority queue is processed. | |
79 | */ | |
80 | static inline int do_siga_output(unsigned long schid, unsigned long mask, | |
81 | unsigned int *bb, unsigned int fc, | |
82 | unsigned long aob) | |
83 | { | |
84 | register unsigned long __fc asm("0") = fc; | |
85 | register unsigned long __schid asm("1") = schid; | |
86 | register unsigned long __mask asm("2") = mask; | |
87 | register unsigned long __aob asm("3") = aob; | |
88 | int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION; | |
89 | ||
90 | asm volatile( | |
91 | " siga 0\n" | |
92 | "0: ipm %0\n" | |
93 | " srl %0,28\n" | |
94 | "1:\n" | |
95 | EX_TABLE(0b, 1b) | |
96 | : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask), | |
97 | "+d" (__aob) | |
98 | : : "cc", "memory"); | |
99 | *bb = ((unsigned int) __fc) >> 31; | |
100 | return cc; | |
101 | } | |
102 | ||
103 | static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq) | |
104 | { | |
105 | /* all done or next buffer state different */ | |
106 | if (ccq == 0 || ccq == 32) | |
107 | return 0; | |
108 | /* no buffer processed */ | |
109 | if (ccq == 97) | |
110 | return 1; | |
111 | /* not all buffers processed */ | |
112 | if (ccq == 96) | |
113 | return 2; | |
114 | /* notify devices immediately */ | |
115 | DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq); | |
116 | return -EIO; | |
117 | } | |
118 | ||
119 | /** | |
120 | * qdio_do_eqbs - extract buffer states for QEBSM | |
121 | * @q: queue to manipulate | |
122 | * @state: state of the extracted buffers | |
123 | * @start: buffer number to start at | |
124 | * @count: count of buffers to examine | |
125 | * @auto_ack: automatically acknowledge buffers | |
126 | * | |
127 | * Returns the number of successfully extracted equal buffer states. | |
128 | * Stops processing if a state is different from the last buffers state. | |
129 | */ | |
130 | static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state, | |
131 | int start, int count, int auto_ack) | |
132 | { | |
133 | int rc, tmp_count = count, tmp_start = start, nr = q->nr, retried = 0; | |
134 | unsigned int ccq = 0; | |
135 | ||
136 | BUG_ON(!q->irq_ptr->sch_token); | |
137 | qperf_inc(q, eqbs); | |
138 | ||
139 | if (!q->is_input_q) | |
140 | nr += q->irq_ptr->nr_input_qs; | |
141 | again: | |
142 | ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count, | |
143 | auto_ack); | |
144 | rc = qdio_check_ccq(q, ccq); | |
145 | if (!rc) | |
146 | return count - tmp_count; | |
147 | ||
148 | if (rc == 1) { | |
149 | DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq); | |
150 | goto again; | |
151 | } | |
152 | ||
153 | if (rc == 2) { | |
154 | BUG_ON(tmp_count == count); | |
155 | qperf_inc(q, eqbs_partial); | |
156 | DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS part:%02x", | |
157 | tmp_count); | |
158 | /* | |
159 | * Retry once, if that fails bail out and process the | |
160 | * extracted buffers before trying again. | |
161 | */ | |
162 | if (!retried++) | |
163 | goto again; | |
164 | else | |
165 | return count - tmp_count; | |
166 | } | |
167 | ||
168 | DBF_ERROR("%4x EQBS ERROR", SCH_NO(q)); | |
169 | DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); | |
170 | q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION, | |
171 | q->nr, q->first_to_kick, count, q->irq_ptr->int_parm); | |
172 | return 0; | |
173 | } | |
174 | ||
175 | /** | |
176 | * qdio_do_sqbs - set buffer states for QEBSM | |
177 | * @q: queue to manipulate | |
178 | * @state: new state of the buffers | |
179 | * @start: first buffer number to change | |
180 | * @count: how many buffers to change | |
181 | * | |
182 | * Returns the number of successfully changed buffers. | |
183 | * Does retrying until the specified count of buffer states is set or an | |
184 | * error occurs. | |
185 | */ | |
186 | static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start, | |
187 | int count) | |
188 | { | |
189 | unsigned int ccq = 0; | |
190 | int tmp_count = count, tmp_start = start; | |
191 | int nr = q->nr; | |
192 | int rc; | |
193 | ||
194 | if (!count) | |
195 | return 0; | |
196 | ||
197 | BUG_ON(!q->irq_ptr->sch_token); | |
198 | qperf_inc(q, sqbs); | |
199 | ||
200 | if (!q->is_input_q) | |
201 | nr += q->irq_ptr->nr_input_qs; | |
202 | again: | |
203 | ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count); | |
204 | rc = qdio_check_ccq(q, ccq); | |
205 | if (!rc) { | |
206 | WARN_ON(tmp_count); | |
207 | return count - tmp_count; | |
208 | } | |
209 | ||
210 | if (rc == 1 || rc == 2) { | |
211 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq); | |
212 | qperf_inc(q, sqbs_partial); | |
213 | goto again; | |
214 | } | |
215 | ||
216 | DBF_ERROR("%4x SQBS ERROR", SCH_NO(q)); | |
217 | DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); | |
218 | q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION, | |
219 | q->nr, q->first_to_kick, count, q->irq_ptr->int_parm); | |
220 | return 0; | |
221 | } | |
222 | ||
223 | /* returns number of examined buffers and their common state in *state */ | |
224 | static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr, | |
225 | unsigned char *state, unsigned int count, | |
226 | int auto_ack, int merge_pending) | |
227 | { | |
228 | unsigned char __state = 0; | |
229 | int i; | |
230 | ||
231 | BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK); | |
232 | BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q); | |
233 | ||
234 | if (is_qebsm(q)) | |
235 | return qdio_do_eqbs(q, state, bufnr, count, auto_ack); | |
236 | ||
237 | for (i = 0; i < count; i++) { | |
238 | if (!__state) { | |
239 | __state = q->slsb.val[bufnr]; | |
240 | if (merge_pending && __state == SLSB_P_OUTPUT_PENDING) | |
241 | __state = SLSB_P_OUTPUT_EMPTY; | |
242 | } else if (merge_pending) { | |
243 | if ((q->slsb.val[bufnr] & __state) != __state) | |
244 | break; | |
245 | } else if (q->slsb.val[bufnr] != __state) | |
246 | break; | |
247 | bufnr = next_buf(bufnr); | |
248 | } | |
249 | *state = __state; | |
250 | return i; | |
251 | } | |
252 | ||
253 | static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr, | |
254 | unsigned char *state, int auto_ack) | |
255 | { | |
256 | return get_buf_states(q, bufnr, state, 1, auto_ack, 0); | |
257 | } | |
258 | ||
259 | /* wrap-around safe setting of slsb states, returns number of changed buffers */ | |
260 | static inline int set_buf_states(struct qdio_q *q, int bufnr, | |
261 | unsigned char state, int count) | |
262 | { | |
263 | int i; | |
264 | ||
265 | BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK); | |
266 | BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q); | |
267 | ||
268 | if (is_qebsm(q)) | |
269 | return qdio_do_sqbs(q, state, bufnr, count); | |
270 | ||
271 | for (i = 0; i < count; i++) { | |
272 | xchg(&q->slsb.val[bufnr], state); | |
273 | bufnr = next_buf(bufnr); | |
274 | } | |
275 | return count; | |
276 | } | |
277 | ||
278 | static inline int set_buf_state(struct qdio_q *q, int bufnr, | |
279 | unsigned char state) | |
280 | { | |
281 | return set_buf_states(q, bufnr, state, 1); | |
282 | } | |
283 | ||
284 | /* set slsb states to initial state */ | |
285 | static void qdio_init_buf_states(struct qdio_irq *irq_ptr) | |
286 | { | |
287 | struct qdio_q *q; | |
288 | int i; | |
289 | ||
290 | for_each_input_queue(irq_ptr, q, i) | |
291 | set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT, | |
292 | QDIO_MAX_BUFFERS_PER_Q); | |
293 | for_each_output_queue(irq_ptr, q, i) | |
294 | set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT, | |
295 | QDIO_MAX_BUFFERS_PER_Q); | |
296 | } | |
297 | ||
298 | static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output, | |
299 | unsigned int input) | |
300 | { | |
301 | unsigned long schid = *((u32 *) &q->irq_ptr->schid); | |
302 | unsigned int fc = QDIO_SIGA_SYNC; | |
303 | int cc; | |
304 | ||
305 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr); | |
306 | qperf_inc(q, siga_sync); | |
307 | ||
308 | if (is_qebsm(q)) { | |
309 | schid = q->irq_ptr->sch_token; | |
310 | fc |= QDIO_SIGA_QEBSM_FLAG; | |
311 | } | |
312 | ||
313 | cc = do_siga_sync(schid, output, input, fc); | |
314 | if (unlikely(cc)) | |
315 | DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc); | |
316 | return cc; | |
317 | } | |
318 | ||
319 | static inline int qdio_siga_sync_q(struct qdio_q *q) | |
320 | { | |
321 | if (q->is_input_q) | |
322 | return qdio_siga_sync(q, 0, q->mask); | |
323 | else | |
324 | return qdio_siga_sync(q, q->mask, 0); | |
325 | } | |
326 | ||
327 | static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit, | |
328 | unsigned long aob) | |
329 | { | |
330 | unsigned long schid = *((u32 *) &q->irq_ptr->schid); | |
331 | unsigned int fc = QDIO_SIGA_WRITE; | |
332 | u64 start_time = 0; | |
333 | int retries = 0, cc; | |
334 | unsigned long laob = 0; | |
335 | ||
336 | if (q->u.out.use_cq && aob != 0) { | |
337 | fc = QDIO_SIGA_WRITEQ; | |
338 | laob = aob; | |
339 | } | |
340 | ||
341 | if (is_qebsm(q)) { | |
342 | schid = q->irq_ptr->sch_token; | |
343 | fc |= QDIO_SIGA_QEBSM_FLAG; | |
344 | } | |
345 | again: | |
346 | WARN_ON_ONCE((aob && queue_type(q) != QDIO_IQDIO_QFMT) || | |
347 | (aob && fc != QDIO_SIGA_WRITEQ)); | |
348 | cc = do_siga_output(schid, q->mask, busy_bit, fc, laob); | |
349 | ||
350 | /* hipersocket busy condition */ | |
351 | if (unlikely(*busy_bit)) { | |
352 | WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2); | |
353 | retries++; | |
354 | ||
355 | if (!start_time) { | |
356 | start_time = get_clock(); | |
357 | goto again; | |
358 | } | |
359 | if ((get_clock() - start_time) < QDIO_BUSY_BIT_PATIENCE) | |
360 | goto again; | |
361 | } | |
362 | if (retries) { | |
363 | DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, | |
364 | "%4x cc2 BB1:%1d", SCH_NO(q), q->nr); | |
365 | DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries); | |
366 | } | |
367 | return cc; | |
368 | } | |
369 | ||
370 | static inline int qdio_siga_input(struct qdio_q *q) | |
371 | { | |
372 | unsigned long schid = *((u32 *) &q->irq_ptr->schid); | |
373 | unsigned int fc = QDIO_SIGA_READ; | |
374 | int cc; | |
375 | ||
376 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr); | |
377 | qperf_inc(q, siga_read); | |
378 | ||
379 | if (is_qebsm(q)) { | |
380 | schid = q->irq_ptr->sch_token; | |
381 | fc |= QDIO_SIGA_QEBSM_FLAG; | |
382 | } | |
383 | ||
384 | cc = do_siga_input(schid, q->mask, fc); | |
385 | if (unlikely(cc)) | |
386 | DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc); | |
387 | return cc; | |
388 | } | |
389 | ||
390 | #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0) | |
391 | #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U) | |
392 | ||
393 | static inline void qdio_sync_queues(struct qdio_q *q) | |
394 | { | |
395 | /* PCI capable outbound queues will also be scanned so sync them too */ | |
396 | if (pci_out_supported(q)) | |
397 | qdio_siga_sync_all(q); | |
398 | else | |
399 | qdio_siga_sync_q(q); | |
400 | } | |
401 | ||
402 | int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr, | |
403 | unsigned char *state) | |
404 | { | |
405 | if (need_siga_sync(q)) | |
406 | qdio_siga_sync_q(q); | |
407 | return get_buf_states(q, bufnr, state, 1, 0, 0); | |
408 | } | |
409 | ||
410 | static inline void qdio_stop_polling(struct qdio_q *q) | |
411 | { | |
412 | if (!q->u.in.polling) | |
413 | return; | |
414 | ||
415 | q->u.in.polling = 0; | |
416 | qperf_inc(q, stop_polling); | |
417 | ||
418 | /* show the card that we are not polling anymore */ | |
419 | if (is_qebsm(q)) { | |
420 | set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, | |
421 | q->u.in.ack_count); | |
422 | q->u.in.ack_count = 0; | |
423 | } else | |
424 | set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); | |
425 | } | |
426 | ||
427 | static inline void account_sbals(struct qdio_q *q, int count) | |
428 | { | |
429 | int pos = 0; | |
430 | ||
431 | q->q_stats.nr_sbal_total += count; | |
432 | if (count == QDIO_MAX_BUFFERS_MASK) { | |
433 | q->q_stats.nr_sbals[7]++; | |
434 | return; | |
435 | } | |
436 | while (count >>= 1) | |
437 | pos++; | |
438 | q->q_stats.nr_sbals[pos]++; | |
439 | } | |
440 | ||
441 | static void process_buffer_error(struct qdio_q *q, int count) | |
442 | { | |
443 | unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT : | |
444 | SLSB_P_OUTPUT_NOT_INIT; | |
445 | ||
446 | q->qdio_error |= QDIO_ERROR_SLSB_STATE; | |
447 | ||
448 | /* special handling for no target buffer empty */ | |
449 | if ((!q->is_input_q && | |
450 | (q->sbal[q->first_to_check]->element[15].sflags) == 0x10)) { | |
451 | qperf_inc(q, target_full); | |
452 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", | |
453 | q->first_to_check); | |
454 | goto set; | |
455 | } | |
456 | ||
457 | DBF_ERROR("%4x BUF ERROR", SCH_NO(q)); | |
458 | DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr); | |
459 | DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count); | |
460 | DBF_ERROR("F14:%2x F15:%2x", | |
461 | q->sbal[q->first_to_check]->element[14].sflags, | |
462 | q->sbal[q->first_to_check]->element[15].sflags); | |
463 | ||
464 | set: | |
465 | /* | |
466 | * Interrupts may be avoided as long as the error is present | |
467 | * so change the buffer state immediately to avoid starvation. | |
468 | */ | |
469 | set_buf_states(q, q->first_to_check, state, count); | |
470 | } | |
471 | ||
472 | static inline void inbound_primed(struct qdio_q *q, int count) | |
473 | { | |
474 | int new; | |
475 | ||
476 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count); | |
477 | ||
478 | /* for QEBSM the ACK was already set by EQBS */ | |
479 | if (is_qebsm(q)) { | |
480 | if (!q->u.in.polling) { | |
481 | q->u.in.polling = 1; | |
482 | q->u.in.ack_count = count; | |
483 | q->u.in.ack_start = q->first_to_check; | |
484 | return; | |
485 | } | |
486 | ||
487 | /* delete the previous ACK's */ | |
488 | set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, | |
489 | q->u.in.ack_count); | |
490 | q->u.in.ack_count = count; | |
491 | q->u.in.ack_start = q->first_to_check; | |
492 | return; | |
493 | } | |
494 | ||
495 | /* | |
496 | * ACK the newest buffer. The ACK will be removed in qdio_stop_polling | |
497 | * or by the next inbound run. | |
498 | */ | |
499 | new = add_buf(q->first_to_check, count - 1); | |
500 | if (q->u.in.polling) { | |
501 | /* reset the previous ACK but first set the new one */ | |
502 | set_buf_state(q, new, SLSB_P_INPUT_ACK); | |
503 | set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); | |
504 | } else { | |
505 | q->u.in.polling = 1; | |
506 | set_buf_state(q, new, SLSB_P_INPUT_ACK); | |
507 | } | |
508 | ||
509 | q->u.in.ack_start = new; | |
510 | count--; | |
511 | if (!count) | |
512 | return; | |
513 | /* need to change ALL buffers to get more interrupts */ | |
514 | set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count); | |
515 | } | |
516 | ||
517 | static int get_inbound_buffer_frontier(struct qdio_q *q) | |
518 | { | |
519 | int count, stop; | |
520 | unsigned char state = 0; | |
521 | ||
522 | q->timestamp = get_clock_fast(); | |
523 | ||
524 | /* | |
525 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved | |
526 | * would return 0. | |
527 | */ | |
528 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); | |
529 | stop = add_buf(q->first_to_check, count); | |
530 | ||
531 | if (q->first_to_check == stop) | |
532 | goto out; | |
533 | ||
534 | /* | |
535 | * No siga sync here, as a PCI or we after a thin interrupt | |
536 | * already sync'ed the queues. | |
537 | */ | |
538 | count = get_buf_states(q, q->first_to_check, &state, count, 1, 0); | |
539 | if (!count) | |
540 | goto out; | |
541 | ||
542 | switch (state) { | |
543 | case SLSB_P_INPUT_PRIMED: | |
544 | inbound_primed(q, count); | |
545 | q->first_to_check = add_buf(q->first_to_check, count); | |
546 | if (atomic_sub(count, &q->nr_buf_used) == 0) | |
547 | qperf_inc(q, inbound_queue_full); | |
548 | if (q->irq_ptr->perf_stat_enabled) | |
549 | account_sbals(q, count); | |
550 | break; | |
551 | case SLSB_P_INPUT_ERROR: | |
552 | process_buffer_error(q, count); | |
553 | q->first_to_check = add_buf(q->first_to_check, count); | |
554 | atomic_sub(count, &q->nr_buf_used); | |
555 | if (q->irq_ptr->perf_stat_enabled) | |
556 | account_sbals_error(q, count); | |
557 | break; | |
558 | case SLSB_CU_INPUT_EMPTY: | |
559 | case SLSB_P_INPUT_NOT_INIT: | |
560 | case SLSB_P_INPUT_ACK: | |
561 | if (q->irq_ptr->perf_stat_enabled) | |
562 | q->q_stats.nr_sbal_nop++; | |
563 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop"); | |
564 | break; | |
565 | default: | |
566 | BUG(); | |
567 | } | |
568 | out: | |
569 | return q->first_to_check; | |
570 | } | |
571 | ||
572 | static int qdio_inbound_q_moved(struct qdio_q *q) | |
573 | { | |
574 | int bufnr; | |
575 | ||
576 | bufnr = get_inbound_buffer_frontier(q); | |
577 | ||
578 | if ((bufnr != q->last_move) || q->qdio_error) { | |
579 | q->last_move = bufnr; | |
580 | if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR) | |
581 | q->u.in.timestamp = get_clock(); | |
582 | return 1; | |
583 | } else | |
584 | return 0; | |
585 | } | |
586 | ||
587 | static inline int qdio_inbound_q_done(struct qdio_q *q) | |
588 | { | |
589 | unsigned char state = 0; | |
590 | ||
591 | if (!atomic_read(&q->nr_buf_used)) | |
592 | return 1; | |
593 | ||
594 | if (need_siga_sync(q)) | |
595 | qdio_siga_sync_q(q); | |
596 | get_buf_state(q, q->first_to_check, &state, 0); | |
597 | ||
598 | if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR) | |
599 | /* more work coming */ | |
600 | return 0; | |
601 | ||
602 | if (is_thinint_irq(q->irq_ptr)) | |
603 | return 1; | |
604 | ||
605 | /* don't poll under z/VM */ | |
606 | if (MACHINE_IS_VM) | |
607 | return 1; | |
608 | ||
609 | /* | |
610 | * At this point we know, that inbound first_to_check | |
611 | * has (probably) not moved (see qdio_inbound_processing). | |
612 | */ | |
613 | if (get_clock() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) { | |
614 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x", | |
615 | q->first_to_check); | |
616 | return 1; | |
617 | } else | |
618 | return 0; | |
619 | } | |
620 | ||
621 | static inline int contains_aobs(struct qdio_q *q) | |
622 | { | |
623 | return !q->is_input_q && q->u.out.use_cq; | |
624 | } | |
625 | ||
626 | static inline void qdio_trace_aob(struct qdio_irq *irq, struct qdio_q *q, | |
627 | int i, struct qaob *aob) | |
628 | { | |
629 | int tmp; | |
630 | ||
631 | DBF_DEV_EVENT(DBF_INFO, irq, "AOB%d:%lx", i, | |
632 | (unsigned long) virt_to_phys(aob)); | |
633 | DBF_DEV_EVENT(DBF_INFO, irq, "RES00:%lx", | |
634 | (unsigned long) aob->res0[0]); | |
635 | DBF_DEV_EVENT(DBF_INFO, irq, "RES01:%lx", | |
636 | (unsigned long) aob->res0[1]); | |
637 | DBF_DEV_EVENT(DBF_INFO, irq, "RES02:%lx", | |
638 | (unsigned long) aob->res0[2]); | |
639 | DBF_DEV_EVENT(DBF_INFO, irq, "RES03:%lx", | |
640 | (unsigned long) aob->res0[3]); | |
641 | DBF_DEV_EVENT(DBF_INFO, irq, "RES04:%lx", | |
642 | (unsigned long) aob->res0[4]); | |
643 | DBF_DEV_EVENT(DBF_INFO, irq, "RES05:%lx", | |
644 | (unsigned long) aob->res0[5]); | |
645 | DBF_DEV_EVENT(DBF_INFO, irq, "RES1:%x", aob->res1); | |
646 | DBF_DEV_EVENT(DBF_INFO, irq, "RES2:%x", aob->res2); | |
647 | DBF_DEV_EVENT(DBF_INFO, irq, "RES3:%x", aob->res3); | |
648 | DBF_DEV_EVENT(DBF_INFO, irq, "AORC:%u", aob->aorc); | |
649 | DBF_DEV_EVENT(DBF_INFO, irq, "FLAGS:%u", aob->flags); | |
650 | DBF_DEV_EVENT(DBF_INFO, irq, "CBTBS:%u", aob->cbtbs); | |
651 | DBF_DEV_EVENT(DBF_INFO, irq, "SBC:%u", aob->sb_count); | |
652 | for (tmp = 0; tmp < QDIO_MAX_ELEMENTS_PER_BUFFER; ++tmp) { | |
653 | DBF_DEV_EVENT(DBF_INFO, irq, "SBA%d:%lx", tmp, | |
654 | (unsigned long) aob->sba[tmp]); | |
655 | DBF_DEV_EVENT(DBF_INFO, irq, "rSBA%d:%lx", tmp, | |
656 | (unsigned long) q->sbal[i]->element[tmp].addr); | |
657 | DBF_DEV_EVENT(DBF_INFO, irq, "DC%d:%u", tmp, aob->dcount[tmp]); | |
658 | DBF_DEV_EVENT(DBF_INFO, irq, "rDC%d:%u", tmp, | |
659 | q->sbal[i]->element[tmp].length); | |
660 | } | |
661 | DBF_DEV_EVENT(DBF_INFO, irq, "USER0:%lx", (unsigned long) aob->user0); | |
662 | for (tmp = 0; tmp < 2; ++tmp) { | |
663 | DBF_DEV_EVENT(DBF_INFO, irq, "RES4%d:%lx", tmp, | |
664 | (unsigned long) aob->res4[tmp]); | |
665 | } | |
666 | DBF_DEV_EVENT(DBF_INFO, irq, "USER1:%lx", (unsigned long) aob->user1); | |
667 | DBF_DEV_EVENT(DBF_INFO, irq, "USER2:%lx", (unsigned long) aob->user2); | |
668 | } | |
669 | ||
670 | static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count) | |
671 | { | |
672 | unsigned char state = 0; | |
673 | int j, b = start; | |
674 | ||
675 | if (!contains_aobs(q)) | |
676 | return; | |
677 | ||
678 | for (j = 0; j < count; ++j) { | |
679 | get_buf_state(q, b, &state, 0); | |
680 | if (state == SLSB_P_OUTPUT_PENDING) { | |
681 | struct qaob *aob = q->u.out.aobs[b]; | |
682 | if (aob == NULL) | |
683 | continue; | |
684 | ||
685 | BUG_ON(q->u.out.sbal_state == NULL); | |
686 | q->u.out.sbal_state[b].flags |= | |
687 | QDIO_OUTBUF_STATE_FLAG_PENDING; | |
688 | q->u.out.aobs[b] = NULL; | |
689 | } else if (state == SLSB_P_OUTPUT_EMPTY) { | |
690 | BUG_ON(q->u.out.sbal_state == NULL); | |
691 | q->u.out.sbal_state[b].aob = NULL; | |
692 | } | |
693 | b = next_buf(b); | |
694 | } | |
695 | } | |
696 | ||
697 | static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q, | |
698 | int bufnr) | |
699 | { | |
700 | unsigned long phys_aob = 0; | |
701 | ||
702 | if (!q->use_cq) | |
703 | goto out; | |
704 | ||
705 | if (!q->aobs[bufnr]) { | |
706 | struct qaob *aob = qdio_allocate_aob(); | |
707 | q->aobs[bufnr] = aob; | |
708 | } | |
709 | if (q->aobs[bufnr]) { | |
710 | BUG_ON(q->sbal_state == NULL); | |
711 | q->sbal_state[bufnr].flags = QDIO_OUTBUF_STATE_FLAG_NONE; | |
712 | q->sbal_state[bufnr].aob = q->aobs[bufnr]; | |
713 | q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user; | |
714 | phys_aob = virt_to_phys(q->aobs[bufnr]); | |
715 | BUG_ON(phys_aob & 0xFF); | |
716 | } | |
717 | ||
718 | out: | |
719 | return phys_aob; | |
720 | } | |
721 | ||
722 | static void qdio_kick_handler(struct qdio_q *q) | |
723 | { | |
724 | int start = q->first_to_kick; | |
725 | int end = q->first_to_check; | |
726 | int count; | |
727 | ||
728 | if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) | |
729 | return; | |
730 | ||
731 | count = sub_buf(end, start); | |
732 | ||
733 | if (q->is_input_q) { | |
734 | qperf_inc(q, inbound_handler); | |
735 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count); | |
736 | } else { | |
737 | qperf_inc(q, outbound_handler); | |
738 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x", | |
739 | start, count); | |
740 | } | |
741 | ||
742 | qdio_handle_aobs(q, start, count); | |
743 | ||
744 | q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count, | |
745 | q->irq_ptr->int_parm); | |
746 | ||
747 | /* for the next time */ | |
748 | q->first_to_kick = end; | |
749 | q->qdio_error = 0; | |
750 | } | |
751 | ||
752 | static void __qdio_inbound_processing(struct qdio_q *q) | |
753 | { | |
754 | qperf_inc(q, tasklet_inbound); | |
755 | ||
756 | if (!qdio_inbound_q_moved(q)) | |
757 | return; | |
758 | ||
759 | qdio_kick_handler(q); | |
760 | ||
761 | if (!qdio_inbound_q_done(q)) { | |
762 | /* means poll time is not yet over */ | |
763 | qperf_inc(q, tasklet_inbound_resched); | |
764 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) { | |
765 | tasklet_schedule(&q->tasklet); | |
766 | return; | |
767 | } | |
768 | } | |
769 | ||
770 | qdio_stop_polling(q); | |
771 | /* | |
772 | * We need to check again to not lose initiative after | |
773 | * resetting the ACK state. | |
774 | */ | |
775 | if (!qdio_inbound_q_done(q)) { | |
776 | qperf_inc(q, tasklet_inbound_resched2); | |
777 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) | |
778 | tasklet_schedule(&q->tasklet); | |
779 | } | |
780 | } | |
781 | ||
782 | void qdio_inbound_processing(unsigned long data) | |
783 | { | |
784 | struct qdio_q *q = (struct qdio_q *)data; | |
785 | __qdio_inbound_processing(q); | |
786 | } | |
787 | ||
788 | static int get_outbound_buffer_frontier(struct qdio_q *q) | |
789 | { | |
790 | int count, stop; | |
791 | unsigned char state = 0; | |
792 | ||
793 | q->timestamp = get_clock_fast(); | |
794 | ||
795 | if (need_siga_sync(q)) | |
796 | if (((queue_type(q) != QDIO_IQDIO_QFMT) && | |
797 | !pci_out_supported(q)) || | |
798 | (queue_type(q) == QDIO_IQDIO_QFMT && | |
799 | multicast_outbound(q))) | |
800 | qdio_siga_sync_q(q); | |
801 | ||
802 | /* | |
803 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved | |
804 | * would return 0. | |
805 | */ | |
806 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); | |
807 | stop = add_buf(q->first_to_check, count); | |
808 | if (q->first_to_check == stop) | |
809 | goto out; | |
810 | ||
811 | count = get_buf_states(q, q->first_to_check, &state, count, 0, 1); | |
812 | if (!count) | |
813 | goto out; | |
814 | ||
815 | switch (state) { | |
816 | case SLSB_P_OUTPUT_PENDING: | |
817 | BUG(); | |
818 | case SLSB_P_OUTPUT_EMPTY: | |
819 | /* the adapter got it */ | |
820 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, | |
821 | "out empty:%1d %02x", q->nr, count); | |
822 | ||
823 | atomic_sub(count, &q->nr_buf_used); | |
824 | q->first_to_check = add_buf(q->first_to_check, count); | |
825 | if (q->irq_ptr->perf_stat_enabled) | |
826 | account_sbals(q, count); | |
827 | ||
828 | break; | |
829 | case SLSB_P_OUTPUT_ERROR: | |
830 | process_buffer_error(q, count); | |
831 | q->first_to_check = add_buf(q->first_to_check, count); | |
832 | atomic_sub(count, &q->nr_buf_used); | |
833 | if (q->irq_ptr->perf_stat_enabled) | |
834 | account_sbals_error(q, count); | |
835 | break; | |
836 | case SLSB_CU_OUTPUT_PRIMED: | |
837 | /* the adapter has not fetched the output yet */ | |
838 | if (q->irq_ptr->perf_stat_enabled) | |
839 | q->q_stats.nr_sbal_nop++; | |
840 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", | |
841 | q->nr); | |
842 | break; | |
843 | case SLSB_P_OUTPUT_NOT_INIT: | |
844 | case SLSB_P_OUTPUT_HALTED: | |
845 | break; | |
846 | default: | |
847 | BUG(); | |
848 | } | |
849 | ||
850 | out: | |
851 | return q->first_to_check; | |
852 | } | |
853 | ||
854 | /* all buffers processed? */ | |
855 | static inline int qdio_outbound_q_done(struct qdio_q *q) | |
856 | { | |
857 | return atomic_read(&q->nr_buf_used) == 0; | |
858 | } | |
859 | ||
860 | static inline int qdio_outbound_q_moved(struct qdio_q *q) | |
861 | { | |
862 | int bufnr; | |
863 | ||
864 | bufnr = get_outbound_buffer_frontier(q); | |
865 | ||
866 | if ((bufnr != q->last_move) || q->qdio_error) { | |
867 | q->last_move = bufnr; | |
868 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr); | |
869 | return 1; | |
870 | } else | |
871 | return 0; | |
872 | } | |
873 | ||
874 | static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob) | |
875 | { | |
876 | int retries = 0, cc; | |
877 | unsigned int busy_bit; | |
878 | ||
879 | if (!need_siga_out(q)) | |
880 | return 0; | |
881 | ||
882 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr); | |
883 | retry: | |
884 | qperf_inc(q, siga_write); | |
885 | ||
886 | cc = qdio_siga_output(q, &busy_bit, aob); | |
887 | switch (cc) { | |
888 | case 0: | |
889 | break; | |
890 | case 2: | |
891 | if (busy_bit) { | |
892 | while (++retries < QDIO_BUSY_BIT_RETRIES) { | |
893 | mdelay(QDIO_BUSY_BIT_RETRY_DELAY); | |
894 | goto retry; | |
895 | } | |
896 | DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr); | |
897 | cc |= QDIO_ERROR_SIGA_BUSY; | |
898 | } else | |
899 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr); | |
900 | break; | |
901 | case 1: | |
902 | case 3: | |
903 | DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc); | |
904 | break; | |
905 | } | |
906 | if (retries) { | |
907 | DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr); | |
908 | DBF_ERROR("count:%u", retries); | |
909 | } | |
910 | return cc; | |
911 | } | |
912 | ||
913 | static void __qdio_outbound_processing(struct qdio_q *q) | |
914 | { | |
915 | qperf_inc(q, tasklet_outbound); | |
916 | BUG_ON(atomic_read(&q->nr_buf_used) < 0); | |
917 | ||
918 | if (qdio_outbound_q_moved(q)) | |
919 | qdio_kick_handler(q); | |
920 | ||
921 | if (queue_type(q) == QDIO_ZFCP_QFMT) | |
922 | if (!pci_out_supported(q) && !qdio_outbound_q_done(q)) | |
923 | goto sched; | |
924 | ||
925 | if (q->u.out.pci_out_enabled) | |
926 | return; | |
927 | ||
928 | /* | |
929 | * Now we know that queue type is either qeth without pci enabled | |
930 | * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY | |
931 | * is noticed and outbound_handler is called after some time. | |
932 | */ | |
933 | if (qdio_outbound_q_done(q)) | |
934 | del_timer(&q->u.out.timer); | |
935 | else | |
936 | if (!timer_pending(&q->u.out.timer)) | |
937 | mod_timer(&q->u.out.timer, jiffies + 10 * HZ); | |
938 | return; | |
939 | ||
940 | sched: | |
941 | if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) | |
942 | return; | |
943 | tasklet_schedule(&q->tasklet); | |
944 | } | |
945 | ||
946 | /* outbound tasklet */ | |
947 | void qdio_outbound_processing(unsigned long data) | |
948 | { | |
949 | struct qdio_q *q = (struct qdio_q *)data; | |
950 | __qdio_outbound_processing(q); | |
951 | } | |
952 | ||
953 | void qdio_outbound_timer(unsigned long data) | |
954 | { | |
955 | struct qdio_q *q = (struct qdio_q *)data; | |
956 | ||
957 | if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) | |
958 | return; | |
959 | tasklet_schedule(&q->tasklet); | |
960 | } | |
961 | ||
962 | static inline void qdio_check_outbound_after_thinint(struct qdio_q *q) | |
963 | { | |
964 | struct qdio_q *out; | |
965 | int i; | |
966 | ||
967 | if (!pci_out_supported(q)) | |
968 | return; | |
969 | ||
970 | for_each_output_queue(q->irq_ptr, out, i) | |
971 | if (!qdio_outbound_q_done(out)) | |
972 | tasklet_schedule(&out->tasklet); | |
973 | } | |
974 | ||
975 | static void __tiqdio_inbound_processing(struct qdio_q *q) | |
976 | { | |
977 | qperf_inc(q, tasklet_inbound); | |
978 | if (need_siga_sync(q) && need_siga_sync_after_ai(q)) | |
979 | qdio_sync_queues(q); | |
980 | ||
981 | /* | |
982 | * The interrupt could be caused by a PCI request. Check the | |
983 | * PCI capable outbound queues. | |
984 | */ | |
985 | qdio_check_outbound_after_thinint(q); | |
986 | ||
987 | if (!qdio_inbound_q_moved(q)) | |
988 | return; | |
989 | ||
990 | qdio_kick_handler(q); | |
991 | ||
992 | if (!qdio_inbound_q_done(q)) { | |
993 | qperf_inc(q, tasklet_inbound_resched); | |
994 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) { | |
995 | tasklet_schedule(&q->tasklet); | |
996 | return; | |
997 | } | |
998 | } | |
999 | ||
1000 | qdio_stop_polling(q); | |
1001 | /* | |
1002 | * We need to check again to not lose initiative after | |
1003 | * resetting the ACK state. | |
1004 | */ | |
1005 | if (!qdio_inbound_q_done(q)) { | |
1006 | qperf_inc(q, tasklet_inbound_resched2); | |
1007 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) | |
1008 | tasklet_schedule(&q->tasklet); | |
1009 | } | |
1010 | } | |
1011 | ||
1012 | void tiqdio_inbound_processing(unsigned long data) | |
1013 | { | |
1014 | struct qdio_q *q = (struct qdio_q *)data; | |
1015 | __tiqdio_inbound_processing(q); | |
1016 | } | |
1017 | ||
1018 | static inline void qdio_set_state(struct qdio_irq *irq_ptr, | |
1019 | enum qdio_irq_states state) | |
1020 | { | |
1021 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state); | |
1022 | ||
1023 | irq_ptr->state = state; | |
1024 | mb(); | |
1025 | } | |
1026 | ||
1027 | static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb) | |
1028 | { | |
1029 | if (irb->esw.esw0.erw.cons) { | |
1030 | DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no); | |
1031 | DBF_ERROR_HEX(irb, 64); | |
1032 | DBF_ERROR_HEX(irb->ecw, 64); | |
1033 | } | |
1034 | } | |
1035 | ||
1036 | /* PCI interrupt handler */ | |
1037 | static void qdio_int_handler_pci(struct qdio_irq *irq_ptr) | |
1038 | { | |
1039 | int i; | |
1040 | struct qdio_q *q; | |
1041 | ||
1042 | if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) | |
1043 | return; | |
1044 | ||
1045 | for_each_input_queue(irq_ptr, q, i) { | |
1046 | if (q->u.in.queue_start_poll) { | |
1047 | /* skip if polling is enabled or already in work */ | |
1048 | if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, | |
1049 | &q->u.in.queue_irq_state)) { | |
1050 | qperf_inc(q, int_discarded); | |
1051 | continue; | |
1052 | } | |
1053 | q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr, | |
1054 | q->irq_ptr->int_parm); | |
1055 | } else { | |
1056 | tasklet_schedule(&q->tasklet); | |
1057 | } | |
1058 | } | |
1059 | ||
1060 | if (!pci_out_supported(q)) | |
1061 | return; | |
1062 | ||
1063 | for_each_output_queue(irq_ptr, q, i) { | |
1064 | if (qdio_outbound_q_done(q)) | |
1065 | continue; | |
1066 | if (need_siga_sync(q) && need_siga_sync_out_after_pci(q)) | |
1067 | qdio_siga_sync_q(q); | |
1068 | tasklet_schedule(&q->tasklet); | |
1069 | } | |
1070 | } | |
1071 | ||
1072 | static void qdio_handle_activate_check(struct ccw_device *cdev, | |
1073 | unsigned long intparm, int cstat, int dstat) | |
1074 | { | |
1075 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1076 | struct qdio_q *q; | |
1077 | int count; | |
1078 | ||
1079 | DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no); | |
1080 | DBF_ERROR("intp :%lx", intparm); | |
1081 | DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); | |
1082 | ||
1083 | if (irq_ptr->nr_input_qs) { | |
1084 | q = irq_ptr->input_qs[0]; | |
1085 | } else if (irq_ptr->nr_output_qs) { | |
1086 | q = irq_ptr->output_qs[0]; | |
1087 | } else { | |
1088 | dump_stack(); | |
1089 | goto no_handler; | |
1090 | } | |
1091 | ||
1092 | count = sub_buf(q->first_to_check, q->first_to_kick); | |
1093 | q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION, | |
1094 | q->nr, q->first_to_kick, count, irq_ptr->int_parm); | |
1095 | no_handler: | |
1096 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); | |
1097 | /* | |
1098 | * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen. | |
1099 | * Therefore we call the LGR detection function here. | |
1100 | */ | |
1101 | lgr_info_log(); | |
1102 | } | |
1103 | ||
1104 | static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat, | |
1105 | int dstat) | |
1106 | { | |
1107 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1108 | ||
1109 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq"); | |
1110 | ||
1111 | if (cstat) | |
1112 | goto error; | |
1113 | if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END)) | |
1114 | goto error; | |
1115 | if (!(dstat & DEV_STAT_DEV_END)) | |
1116 | goto error; | |
1117 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED); | |
1118 | return; | |
1119 | ||
1120 | error: | |
1121 | DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no); | |
1122 | DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); | |
1123 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); | |
1124 | } | |
1125 | ||
1126 | /* qdio interrupt handler */ | |
1127 | void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm, | |
1128 | struct irb *irb) | |
1129 | { | |
1130 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1131 | int cstat, dstat; | |
1132 | ||
1133 | if (!intparm || !irq_ptr) { | |
1134 | DBF_ERROR("qint:%4x", cdev->private->schid.sch_no); | |
1135 | return; | |
1136 | } | |
1137 | ||
1138 | if (irq_ptr->perf_stat_enabled) | |
1139 | irq_ptr->perf_stat.qdio_int++; | |
1140 | ||
1141 | if (IS_ERR(irb)) { | |
1142 | switch (PTR_ERR(irb)) { | |
1143 | case -EIO: | |
1144 | DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no); | |
1145 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); | |
1146 | wake_up(&cdev->private->wait_q); | |
1147 | return; | |
1148 | default: | |
1149 | WARN_ON(1); | |
1150 | return; | |
1151 | } | |
1152 | } | |
1153 | qdio_irq_check_sense(irq_ptr, irb); | |
1154 | cstat = irb->scsw.cmd.cstat; | |
1155 | dstat = irb->scsw.cmd.dstat; | |
1156 | ||
1157 | switch (irq_ptr->state) { | |
1158 | case QDIO_IRQ_STATE_INACTIVE: | |
1159 | qdio_establish_handle_irq(cdev, cstat, dstat); | |
1160 | break; | |
1161 | case QDIO_IRQ_STATE_CLEANUP: | |
1162 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1163 | break; | |
1164 | case QDIO_IRQ_STATE_ESTABLISHED: | |
1165 | case QDIO_IRQ_STATE_ACTIVE: | |
1166 | if (cstat & SCHN_STAT_PCI) { | |
1167 | qdio_int_handler_pci(irq_ptr); | |
1168 | return; | |
1169 | } | |
1170 | if (cstat || dstat) | |
1171 | qdio_handle_activate_check(cdev, intparm, cstat, | |
1172 | dstat); | |
1173 | break; | |
1174 | case QDIO_IRQ_STATE_STOPPED: | |
1175 | break; | |
1176 | default: | |
1177 | WARN_ON(1); | |
1178 | } | |
1179 | wake_up(&cdev->private->wait_q); | |
1180 | } | |
1181 | ||
1182 | /** | |
1183 | * qdio_get_ssqd_desc - get qdio subchannel description | |
1184 | * @cdev: ccw device to get description for | |
1185 | * @data: where to store the ssqd | |
1186 | * | |
1187 | * Returns 0 or an error code. The results of the chsc are stored in the | |
1188 | * specified structure. | |
1189 | */ | |
1190 | int qdio_get_ssqd_desc(struct ccw_device *cdev, | |
1191 | struct qdio_ssqd_desc *data) | |
1192 | { | |
1193 | ||
1194 | if (!cdev || !cdev->private) | |
1195 | return -EINVAL; | |
1196 | ||
1197 | DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no); | |
1198 | return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data); | |
1199 | } | |
1200 | EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc); | |
1201 | ||
1202 | static void qdio_shutdown_queues(struct ccw_device *cdev) | |
1203 | { | |
1204 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1205 | struct qdio_q *q; | |
1206 | int i; | |
1207 | ||
1208 | for_each_input_queue(irq_ptr, q, i) | |
1209 | tasklet_kill(&q->tasklet); | |
1210 | ||
1211 | for_each_output_queue(irq_ptr, q, i) { | |
1212 | del_timer(&q->u.out.timer); | |
1213 | tasklet_kill(&q->tasklet); | |
1214 | } | |
1215 | } | |
1216 | ||
1217 | /** | |
1218 | * qdio_shutdown - shut down a qdio subchannel | |
1219 | * @cdev: associated ccw device | |
1220 | * @how: use halt or clear to shutdown | |
1221 | */ | |
1222 | int qdio_shutdown(struct ccw_device *cdev, int how) | |
1223 | { | |
1224 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1225 | int rc; | |
1226 | unsigned long flags; | |
1227 | ||
1228 | if (!irq_ptr) | |
1229 | return -ENODEV; | |
1230 | ||
1231 | BUG_ON(irqs_disabled()); | |
1232 | DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no); | |
1233 | ||
1234 | mutex_lock(&irq_ptr->setup_mutex); | |
1235 | /* | |
1236 | * Subchannel was already shot down. We cannot prevent being called | |
1237 | * twice since cio may trigger a shutdown asynchronously. | |
1238 | */ | |
1239 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { | |
1240 | mutex_unlock(&irq_ptr->setup_mutex); | |
1241 | return 0; | |
1242 | } | |
1243 | ||
1244 | /* | |
1245 | * Indicate that the device is going down. Scheduling the queue | |
1246 | * tasklets is forbidden from here on. | |
1247 | */ | |
1248 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); | |
1249 | ||
1250 | tiqdio_remove_input_queues(irq_ptr); | |
1251 | qdio_shutdown_queues(cdev); | |
1252 | qdio_shutdown_debug_entries(irq_ptr, cdev); | |
1253 | ||
1254 | /* cleanup subchannel */ | |
1255 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1256 | ||
1257 | if (how & QDIO_FLAG_CLEANUP_USING_CLEAR) | |
1258 | rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP); | |
1259 | else | |
1260 | /* default behaviour is halt */ | |
1261 | rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP); | |
1262 | if (rc) { | |
1263 | DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no); | |
1264 | DBF_ERROR("rc:%4d", rc); | |
1265 | goto no_cleanup; | |
1266 | } | |
1267 | ||
1268 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP); | |
1269 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1270 | wait_event_interruptible_timeout(cdev->private->wait_q, | |
1271 | irq_ptr->state == QDIO_IRQ_STATE_INACTIVE || | |
1272 | irq_ptr->state == QDIO_IRQ_STATE_ERR, | |
1273 | 10 * HZ); | |
1274 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1275 | ||
1276 | no_cleanup: | |
1277 | qdio_shutdown_thinint(irq_ptr); | |
1278 | ||
1279 | /* restore interrupt handler */ | |
1280 | if ((void *)cdev->handler == (void *)qdio_int_handler) | |
1281 | cdev->handler = irq_ptr->orig_handler; | |
1282 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1283 | ||
1284 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1285 | mutex_unlock(&irq_ptr->setup_mutex); | |
1286 | if (rc) | |
1287 | return rc; | |
1288 | return 0; | |
1289 | } | |
1290 | EXPORT_SYMBOL_GPL(qdio_shutdown); | |
1291 | ||
1292 | /** | |
1293 | * qdio_free - free data structures for a qdio subchannel | |
1294 | * @cdev: associated ccw device | |
1295 | */ | |
1296 | int qdio_free(struct ccw_device *cdev) | |
1297 | { | |
1298 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1299 | ||
1300 | if (!irq_ptr) | |
1301 | return -ENODEV; | |
1302 | ||
1303 | DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no); | |
1304 | mutex_lock(&irq_ptr->setup_mutex); | |
1305 | ||
1306 | if (irq_ptr->debug_area != NULL) { | |
1307 | debug_unregister(irq_ptr->debug_area); | |
1308 | irq_ptr->debug_area = NULL; | |
1309 | } | |
1310 | cdev->private->qdio_data = NULL; | |
1311 | mutex_unlock(&irq_ptr->setup_mutex); | |
1312 | ||
1313 | qdio_release_memory(irq_ptr); | |
1314 | return 0; | |
1315 | } | |
1316 | EXPORT_SYMBOL_GPL(qdio_free); | |
1317 | ||
1318 | /** | |
1319 | * qdio_allocate - allocate qdio queues and associated data | |
1320 | * @init_data: initialization data | |
1321 | */ | |
1322 | int qdio_allocate(struct qdio_initialize *init_data) | |
1323 | { | |
1324 | struct qdio_irq *irq_ptr; | |
1325 | ||
1326 | DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no); | |
1327 | ||
1328 | if ((init_data->no_input_qs && !init_data->input_handler) || | |
1329 | (init_data->no_output_qs && !init_data->output_handler)) | |
1330 | return -EINVAL; | |
1331 | ||
1332 | if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) || | |
1333 | (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)) | |
1334 | return -EINVAL; | |
1335 | ||
1336 | if ((!init_data->input_sbal_addr_array) || | |
1337 | (!init_data->output_sbal_addr_array)) | |
1338 | return -EINVAL; | |
1339 | ||
1340 | /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */ | |
1341 | irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
1342 | if (!irq_ptr) | |
1343 | goto out_err; | |
1344 | ||
1345 | mutex_init(&irq_ptr->setup_mutex); | |
1346 | qdio_allocate_dbf(init_data, irq_ptr); | |
1347 | ||
1348 | /* | |
1349 | * Allocate a page for the chsc calls in qdio_establish. | |
1350 | * Must be pre-allocated since a zfcp recovery will call | |
1351 | * qdio_establish. In case of low memory and swap on a zfcp disk | |
1352 | * we may not be able to allocate memory otherwise. | |
1353 | */ | |
1354 | irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL); | |
1355 | if (!irq_ptr->chsc_page) | |
1356 | goto out_rel; | |
1357 | ||
1358 | /* qdr is used in ccw1.cda which is u32 */ | |
1359 | irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
1360 | if (!irq_ptr->qdr) | |
1361 | goto out_rel; | |
1362 | WARN_ON((unsigned long)irq_ptr->qdr & 0xfff); | |
1363 | ||
1364 | if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs, | |
1365 | init_data->no_output_qs)) | |
1366 | goto out_rel; | |
1367 | ||
1368 | init_data->cdev->private->qdio_data = irq_ptr; | |
1369 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1370 | return 0; | |
1371 | out_rel: | |
1372 | qdio_release_memory(irq_ptr); | |
1373 | out_err: | |
1374 | return -ENOMEM; | |
1375 | } | |
1376 | EXPORT_SYMBOL_GPL(qdio_allocate); | |
1377 | ||
1378 | static void qdio_detect_hsicq(struct qdio_irq *irq_ptr) | |
1379 | { | |
1380 | struct qdio_q *q = irq_ptr->input_qs[0]; | |
1381 | int i, use_cq = 0; | |
1382 | ||
1383 | if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT) | |
1384 | use_cq = 1; | |
1385 | ||
1386 | for_each_output_queue(irq_ptr, q, i) { | |
1387 | if (use_cq) { | |
1388 | if (qdio_enable_async_operation(&q->u.out) < 0) { | |
1389 | use_cq = 0; | |
1390 | continue; | |
1391 | } | |
1392 | } else | |
1393 | qdio_disable_async_operation(&q->u.out); | |
1394 | } | |
1395 | DBF_EVENT("use_cq:%d", use_cq); | |
1396 | } | |
1397 | ||
1398 | /** | |
1399 | * qdio_establish - establish queues on a qdio subchannel | |
1400 | * @init_data: initialization data | |
1401 | */ | |
1402 | int qdio_establish(struct qdio_initialize *init_data) | |
1403 | { | |
1404 | struct qdio_irq *irq_ptr; | |
1405 | struct ccw_device *cdev = init_data->cdev; | |
1406 | unsigned long saveflags; | |
1407 | int rc; | |
1408 | ||
1409 | DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no); | |
1410 | ||
1411 | irq_ptr = cdev->private->qdio_data; | |
1412 | if (!irq_ptr) | |
1413 | return -ENODEV; | |
1414 | ||
1415 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1416 | return -EINVAL; | |
1417 | ||
1418 | mutex_lock(&irq_ptr->setup_mutex); | |
1419 | qdio_setup_irq(init_data); | |
1420 | ||
1421 | rc = qdio_establish_thinint(irq_ptr); | |
1422 | if (rc) { | |
1423 | mutex_unlock(&irq_ptr->setup_mutex); | |
1424 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1425 | return rc; | |
1426 | } | |
1427 | ||
1428 | /* establish q */ | |
1429 | irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd; | |
1430 | irq_ptr->ccw.flags = CCW_FLAG_SLI; | |
1431 | irq_ptr->ccw.count = irq_ptr->equeue.count; | |
1432 | irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr); | |
1433 | ||
1434 | spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); | |
1435 | ccw_device_set_options_mask(cdev, 0); | |
1436 | ||
1437 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0); | |
1438 | if (rc) { | |
1439 | DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no); | |
1440 | DBF_ERROR("rc:%4x", rc); | |
1441 | } | |
1442 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); | |
1443 | ||
1444 | if (rc) { | |
1445 | mutex_unlock(&irq_ptr->setup_mutex); | |
1446 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1447 | return rc; | |
1448 | } | |
1449 | ||
1450 | wait_event_interruptible_timeout(cdev->private->wait_q, | |
1451 | irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED || | |
1452 | irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ); | |
1453 | ||
1454 | if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) { | |
1455 | mutex_unlock(&irq_ptr->setup_mutex); | |
1456 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1457 | return -EIO; | |
1458 | } | |
1459 | ||
1460 | qdio_setup_ssqd_info(irq_ptr); | |
1461 | ||
1462 | qdio_detect_hsicq(irq_ptr); | |
1463 | ||
1464 | /* qebsm is now setup if available, initialize buffer states */ | |
1465 | qdio_init_buf_states(irq_ptr); | |
1466 | ||
1467 | mutex_unlock(&irq_ptr->setup_mutex); | |
1468 | qdio_print_subchannel_info(irq_ptr, cdev); | |
1469 | qdio_setup_debug_entries(irq_ptr, cdev); | |
1470 | return 0; | |
1471 | } | |
1472 | EXPORT_SYMBOL_GPL(qdio_establish); | |
1473 | ||
1474 | /** | |
1475 | * qdio_activate - activate queues on a qdio subchannel | |
1476 | * @cdev: associated cdev | |
1477 | */ | |
1478 | int qdio_activate(struct ccw_device *cdev) | |
1479 | { | |
1480 | struct qdio_irq *irq_ptr; | |
1481 | int rc; | |
1482 | unsigned long saveflags; | |
1483 | ||
1484 | DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no); | |
1485 | ||
1486 | irq_ptr = cdev->private->qdio_data; | |
1487 | if (!irq_ptr) | |
1488 | return -ENODEV; | |
1489 | ||
1490 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1491 | return -EINVAL; | |
1492 | ||
1493 | mutex_lock(&irq_ptr->setup_mutex); | |
1494 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { | |
1495 | rc = -EBUSY; | |
1496 | goto out; | |
1497 | } | |
1498 | ||
1499 | irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd; | |
1500 | irq_ptr->ccw.flags = CCW_FLAG_SLI; | |
1501 | irq_ptr->ccw.count = irq_ptr->aqueue.count; | |
1502 | irq_ptr->ccw.cda = 0; | |
1503 | ||
1504 | spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); | |
1505 | ccw_device_set_options(cdev, CCWDEV_REPORT_ALL); | |
1506 | ||
1507 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE, | |
1508 | 0, DOIO_DENY_PREFETCH); | |
1509 | if (rc) { | |
1510 | DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no); | |
1511 | DBF_ERROR("rc:%4x", rc); | |
1512 | } | |
1513 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); | |
1514 | ||
1515 | if (rc) | |
1516 | goto out; | |
1517 | ||
1518 | if (is_thinint_irq(irq_ptr)) | |
1519 | tiqdio_add_input_queues(irq_ptr); | |
1520 | ||
1521 | /* wait for subchannel to become active */ | |
1522 | msleep(5); | |
1523 | ||
1524 | switch (irq_ptr->state) { | |
1525 | case QDIO_IRQ_STATE_STOPPED: | |
1526 | case QDIO_IRQ_STATE_ERR: | |
1527 | rc = -EIO; | |
1528 | break; | |
1529 | default: | |
1530 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE); | |
1531 | rc = 0; | |
1532 | } | |
1533 | out: | |
1534 | mutex_unlock(&irq_ptr->setup_mutex); | |
1535 | return rc; | |
1536 | } | |
1537 | EXPORT_SYMBOL_GPL(qdio_activate); | |
1538 | ||
1539 | static inline int buf_in_between(int bufnr, int start, int count) | |
1540 | { | |
1541 | int end = add_buf(start, count); | |
1542 | ||
1543 | if (end > start) { | |
1544 | if (bufnr >= start && bufnr < end) | |
1545 | return 1; | |
1546 | else | |
1547 | return 0; | |
1548 | } | |
1549 | ||
1550 | /* wrap-around case */ | |
1551 | if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) || | |
1552 | (bufnr < end)) | |
1553 | return 1; | |
1554 | else | |
1555 | return 0; | |
1556 | } | |
1557 | ||
1558 | /** | |
1559 | * handle_inbound - reset processed input buffers | |
1560 | * @q: queue containing the buffers | |
1561 | * @callflags: flags | |
1562 | * @bufnr: first buffer to process | |
1563 | * @count: how many buffers are emptied | |
1564 | */ | |
1565 | static int handle_inbound(struct qdio_q *q, unsigned int callflags, | |
1566 | int bufnr, int count) | |
1567 | { | |
1568 | int used, diff; | |
1569 | ||
1570 | qperf_inc(q, inbound_call); | |
1571 | ||
1572 | if (!q->u.in.polling) | |
1573 | goto set; | |
1574 | ||
1575 | /* protect against stop polling setting an ACK for an emptied slsb */ | |
1576 | if (count == QDIO_MAX_BUFFERS_PER_Q) { | |
1577 | /* overwriting everything, just delete polling status */ | |
1578 | q->u.in.polling = 0; | |
1579 | q->u.in.ack_count = 0; | |
1580 | goto set; | |
1581 | } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) { | |
1582 | if (is_qebsm(q)) { | |
1583 | /* partial overwrite, just update ack_start */ | |
1584 | diff = add_buf(bufnr, count); | |
1585 | diff = sub_buf(diff, q->u.in.ack_start); | |
1586 | q->u.in.ack_count -= diff; | |
1587 | if (q->u.in.ack_count <= 0) { | |
1588 | q->u.in.polling = 0; | |
1589 | q->u.in.ack_count = 0; | |
1590 | goto set; | |
1591 | } | |
1592 | q->u.in.ack_start = add_buf(q->u.in.ack_start, diff); | |
1593 | } | |
1594 | else | |
1595 | /* the only ACK will be deleted, so stop polling */ | |
1596 | q->u.in.polling = 0; | |
1597 | } | |
1598 | ||
1599 | set: | |
1600 | count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count); | |
1601 | ||
1602 | used = atomic_add_return(count, &q->nr_buf_used) - count; | |
1603 | BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q); | |
1604 | ||
1605 | if (need_siga_in(q)) | |
1606 | return qdio_siga_input(q); | |
1607 | ||
1608 | return 0; | |
1609 | } | |
1610 | ||
1611 | /** | |
1612 | * handle_outbound - process filled outbound buffers | |
1613 | * @q: queue containing the buffers | |
1614 | * @callflags: flags | |
1615 | * @bufnr: first buffer to process | |
1616 | * @count: how many buffers are filled | |
1617 | */ | |
1618 | static int handle_outbound(struct qdio_q *q, unsigned int callflags, | |
1619 | int bufnr, int count) | |
1620 | { | |
1621 | unsigned char state = 0; | |
1622 | int used, rc = 0; | |
1623 | ||
1624 | qperf_inc(q, outbound_call); | |
1625 | ||
1626 | count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count); | |
1627 | used = atomic_add_return(count, &q->nr_buf_used); | |
1628 | BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q); | |
1629 | ||
1630 | if (used == QDIO_MAX_BUFFERS_PER_Q) | |
1631 | qperf_inc(q, outbound_queue_full); | |
1632 | ||
1633 | if (callflags & QDIO_FLAG_PCI_OUT) { | |
1634 | q->u.out.pci_out_enabled = 1; | |
1635 | qperf_inc(q, pci_request_int); | |
1636 | } else | |
1637 | q->u.out.pci_out_enabled = 0; | |
1638 | ||
1639 | if (queue_type(q) == QDIO_IQDIO_QFMT) { | |
1640 | unsigned long phys_aob = 0; | |
1641 | ||
1642 | /* One SIGA-W per buffer required for unicast HSI */ | |
1643 | WARN_ON_ONCE(count > 1 && !multicast_outbound(q)); | |
1644 | ||
1645 | phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr); | |
1646 | ||
1647 | rc = qdio_kick_outbound_q(q, phys_aob); | |
1648 | } else if (need_siga_sync(q)) { | |
1649 | rc = qdio_siga_sync_q(q); | |
1650 | } else { | |
1651 | /* try to fast requeue buffers */ | |
1652 | get_buf_state(q, prev_buf(bufnr), &state, 0); | |
1653 | if (state != SLSB_CU_OUTPUT_PRIMED) | |
1654 | rc = qdio_kick_outbound_q(q, 0); | |
1655 | else | |
1656 | qperf_inc(q, fast_requeue); | |
1657 | } | |
1658 | ||
1659 | /* in case of SIGA errors we must process the error immediately */ | |
1660 | if (used >= q->u.out.scan_threshold || rc) | |
1661 | tasklet_schedule(&q->tasklet); | |
1662 | else | |
1663 | /* free the SBALs in case of no further traffic */ | |
1664 | if (!timer_pending(&q->u.out.timer)) | |
1665 | mod_timer(&q->u.out.timer, jiffies + HZ); | |
1666 | return rc; | |
1667 | } | |
1668 | ||
1669 | /** | |
1670 | * do_QDIO - process input or output buffers | |
1671 | * @cdev: associated ccw_device for the qdio subchannel | |
1672 | * @callflags: input or output and special flags from the program | |
1673 | * @q_nr: queue number | |
1674 | * @bufnr: buffer number | |
1675 | * @count: how many buffers to process | |
1676 | */ | |
1677 | int do_QDIO(struct ccw_device *cdev, unsigned int callflags, | |
1678 | int q_nr, unsigned int bufnr, unsigned int count) | |
1679 | { | |
1680 | struct qdio_irq *irq_ptr; | |
1681 | ||
1682 | ||
1683 | if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q) | |
1684 | return -EINVAL; | |
1685 | ||
1686 | irq_ptr = cdev->private->qdio_data; | |
1687 | if (!irq_ptr) | |
1688 | return -ENODEV; | |
1689 | ||
1690 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, | |
1691 | "do%02x b:%02x c:%02x", callflags, bufnr, count); | |
1692 | ||
1693 | if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE) | |
1694 | return -EBUSY; | |
1695 | if (!count) | |
1696 | return 0; | |
1697 | if (callflags & QDIO_FLAG_SYNC_INPUT) | |
1698 | return handle_inbound(irq_ptr->input_qs[q_nr], | |
1699 | callflags, bufnr, count); | |
1700 | else if (callflags & QDIO_FLAG_SYNC_OUTPUT) | |
1701 | return handle_outbound(irq_ptr->output_qs[q_nr], | |
1702 | callflags, bufnr, count); | |
1703 | return -EINVAL; | |
1704 | } | |
1705 | EXPORT_SYMBOL_GPL(do_QDIO); | |
1706 | ||
1707 | /** | |
1708 | * qdio_start_irq - process input buffers | |
1709 | * @cdev: associated ccw_device for the qdio subchannel | |
1710 | * @nr: input queue number | |
1711 | * | |
1712 | * Return codes | |
1713 | * 0 - success | |
1714 | * 1 - irqs not started since new data is available | |
1715 | */ | |
1716 | int qdio_start_irq(struct ccw_device *cdev, int nr) | |
1717 | { | |
1718 | struct qdio_q *q; | |
1719 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1720 | ||
1721 | if (!irq_ptr) | |
1722 | return -ENODEV; | |
1723 | q = irq_ptr->input_qs[nr]; | |
1724 | ||
1725 | WARN_ON(queue_irqs_enabled(q)); | |
1726 | ||
1727 | clear_nonshared_ind(irq_ptr); | |
1728 | qdio_stop_polling(q); | |
1729 | clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state); | |
1730 | ||
1731 | /* | |
1732 | * We need to check again to not lose initiative after | |
1733 | * resetting the ACK state. | |
1734 | */ | |
1735 | if (test_nonshared_ind(irq_ptr)) | |
1736 | goto rescan; | |
1737 | if (!qdio_inbound_q_done(q)) | |
1738 | goto rescan; | |
1739 | return 0; | |
1740 | ||
1741 | rescan: | |
1742 | if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, | |
1743 | &q->u.in.queue_irq_state)) | |
1744 | return 0; | |
1745 | else | |
1746 | return 1; | |
1747 | ||
1748 | } | |
1749 | EXPORT_SYMBOL(qdio_start_irq); | |
1750 | ||
1751 | /** | |
1752 | * qdio_get_next_buffers - process input buffers | |
1753 | * @cdev: associated ccw_device for the qdio subchannel | |
1754 | * @nr: input queue number | |
1755 | * @bufnr: first filled buffer number | |
1756 | * @error: buffers are in error state | |
1757 | * | |
1758 | * Return codes | |
1759 | * < 0 - error | |
1760 | * = 0 - no new buffers found | |
1761 | * > 0 - number of processed buffers | |
1762 | */ | |
1763 | int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr, | |
1764 | int *error) | |
1765 | { | |
1766 | struct qdio_q *q; | |
1767 | int start, end; | |
1768 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1769 | ||
1770 | if (!irq_ptr) | |
1771 | return -ENODEV; | |
1772 | q = irq_ptr->input_qs[nr]; | |
1773 | WARN_ON(queue_irqs_enabled(q)); | |
1774 | ||
1775 | /* | |
1776 | * Cannot rely on automatic sync after interrupt since queues may | |
1777 | * also be examined without interrupt. | |
1778 | */ | |
1779 | if (need_siga_sync(q)) | |
1780 | qdio_sync_queues(q); | |
1781 | ||
1782 | /* check the PCI capable outbound queues. */ | |
1783 | qdio_check_outbound_after_thinint(q); | |
1784 | ||
1785 | if (!qdio_inbound_q_moved(q)) | |
1786 | return 0; | |
1787 | ||
1788 | /* Note: upper-layer MUST stop processing immediately here ... */ | |
1789 | if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) | |
1790 | return -EIO; | |
1791 | ||
1792 | start = q->first_to_kick; | |
1793 | end = q->first_to_check; | |
1794 | *bufnr = start; | |
1795 | *error = q->qdio_error; | |
1796 | ||
1797 | /* for the next time */ | |
1798 | q->first_to_kick = end; | |
1799 | q->qdio_error = 0; | |
1800 | return sub_buf(end, start); | |
1801 | } | |
1802 | EXPORT_SYMBOL(qdio_get_next_buffers); | |
1803 | ||
1804 | /** | |
1805 | * qdio_stop_irq - disable interrupt processing for the device | |
1806 | * @cdev: associated ccw_device for the qdio subchannel | |
1807 | * @nr: input queue number | |
1808 | * | |
1809 | * Return codes | |
1810 | * 0 - interrupts were already disabled | |
1811 | * 1 - interrupts successfully disabled | |
1812 | */ | |
1813 | int qdio_stop_irq(struct ccw_device *cdev, int nr) | |
1814 | { | |
1815 | struct qdio_q *q; | |
1816 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1817 | ||
1818 | if (!irq_ptr) | |
1819 | return -ENODEV; | |
1820 | q = irq_ptr->input_qs[nr]; | |
1821 | ||
1822 | if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, | |
1823 | &q->u.in.queue_irq_state)) | |
1824 | return 0; | |
1825 | else | |
1826 | return 1; | |
1827 | } | |
1828 | EXPORT_SYMBOL(qdio_stop_irq); | |
1829 | ||
1830 | static int __init init_QDIO(void) | |
1831 | { | |
1832 | int rc; | |
1833 | ||
1834 | rc = qdio_debug_init(); | |
1835 | if (rc) | |
1836 | return rc; | |
1837 | rc = qdio_setup_init(); | |
1838 | if (rc) | |
1839 | goto out_debug; | |
1840 | rc = tiqdio_allocate_memory(); | |
1841 | if (rc) | |
1842 | goto out_cache; | |
1843 | rc = tiqdio_register_thinints(); | |
1844 | if (rc) | |
1845 | goto out_ti; | |
1846 | return 0; | |
1847 | ||
1848 | out_ti: | |
1849 | tiqdio_free_memory(); | |
1850 | out_cache: | |
1851 | qdio_setup_exit(); | |
1852 | out_debug: | |
1853 | qdio_debug_exit(); | |
1854 | return rc; | |
1855 | } | |
1856 | ||
1857 | static void __exit exit_QDIO(void) | |
1858 | { | |
1859 | tiqdio_unregister_thinints(); | |
1860 | tiqdio_free_memory(); | |
1861 | qdio_setup_exit(); | |
1862 | qdio_debug_exit(); | |
1863 | } | |
1864 | ||
1865 | module_init(init_QDIO); | |
1866 | module_exit(exit_QDIO); |