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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> | |
16 | #include <asm/atomic.h> | |
17 | #include <asm/debug.h> | |
18 | #include <asm/qdio.h> | |
19 | ||
20 | #include "cio.h" | |
21 | #include "css.h" | |
22 | #include "device.h" | |
23 | #include "qdio.h" | |
24 | #include "qdio_debug.h" | |
25 | #include "qdio_perf.h" | |
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, | |
77 | u32 *bb, unsigned int fc) | |
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 | { | |
98 | char dbf_text[15]; | |
99 | ||
100 | /* all done or next buffer state different */ | |
101 | if (ccq == 0 || ccq == 32) | |
102 | return 0; | |
103 | /* not all buffers processed */ | |
104 | if (ccq == 96 || ccq == 97) | |
105 | return 1; | |
106 | /* notify devices immediately */ | |
107 | sprintf(dbf_text, "%d", ccq); | |
108 | QDIO_DBF_TEXT2(1, trace, dbf_text); | |
109 | return -EIO; | |
110 | } | |
111 | ||
112 | /** | |
113 | * qdio_do_eqbs - extract buffer states for QEBSM | |
114 | * @q: queue to manipulate | |
115 | * @state: state of the extracted buffers | |
116 | * @start: buffer number to start at | |
117 | * @count: count of buffers to examine | |
118 | * | |
119 | * Returns the number of successfull extracted equal buffer states. | |
120 | * Stops processing if a state is different from the last buffers state. | |
121 | */ | |
122 | static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state, | |
123 | int start, int count) | |
124 | { | |
125 | unsigned int ccq = 0; | |
126 | int tmp_count = count, tmp_start = start; | |
127 | int nr = q->nr; | |
128 | int rc; | |
129 | char dbf_text[15]; | |
130 | ||
131 | BUG_ON(!q->irq_ptr->sch_token); | |
132 | ||
133 | if (!q->is_input_q) | |
134 | nr += q->irq_ptr->nr_input_qs; | |
135 | again: | |
136 | ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count); | |
137 | rc = qdio_check_ccq(q, ccq); | |
138 | ||
139 | /* At least one buffer was processed, return and extract the remaining | |
140 | * buffers later. | |
141 | */ | |
142 | if ((ccq == 96) && (count != tmp_count)) | |
143 | return (count - tmp_count); | |
144 | if (rc == 1) { | |
145 | QDIO_DBF_TEXT5(1, trace, "eqAGAIN"); | |
146 | goto again; | |
147 | } | |
148 | ||
149 | if (rc < 0) { | |
150 | QDIO_DBF_TEXT2(1, trace, "eqberr"); | |
151 | sprintf(dbf_text, "%2x,%2x,%d,%d", count, tmp_count, ccq, nr); | |
152 | QDIO_DBF_TEXT2(1, trace, dbf_text); | |
153 | q->handler(q->irq_ptr->cdev, | |
154 | QDIO_ERROR_ACTIVATE_CHECK_CONDITION, | |
155 | 0, -1, -1, q->irq_ptr->int_parm); | |
156 | return 0; | |
157 | } | |
158 | return count - tmp_count; | |
159 | } | |
160 | ||
161 | /** | |
162 | * qdio_do_sqbs - set buffer states for QEBSM | |
163 | * @q: queue to manipulate | |
164 | * @state: new state of the buffers | |
165 | * @start: first buffer number to change | |
166 | * @count: how many buffers to change | |
167 | * | |
168 | * Returns the number of successfully changed buffers. | |
169 | * Does retrying until the specified count of buffer states is set or an | |
170 | * error occurs. | |
171 | */ | |
172 | static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start, | |
173 | int count) | |
174 | { | |
175 | unsigned int ccq = 0; | |
176 | int tmp_count = count, tmp_start = start; | |
177 | int nr = q->nr; | |
178 | int rc; | |
179 | char dbf_text[15]; | |
180 | ||
181 | BUG_ON(!q->irq_ptr->sch_token); | |
182 | ||
183 | if (!q->is_input_q) | |
184 | nr += q->irq_ptr->nr_input_qs; | |
185 | again: | |
186 | ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count); | |
187 | rc = qdio_check_ccq(q, ccq); | |
188 | if (rc == 1) { | |
189 | QDIO_DBF_TEXT5(1, trace, "sqAGAIN"); | |
190 | goto again; | |
191 | } | |
192 | if (rc < 0) { | |
193 | QDIO_DBF_TEXT3(1, trace, "sqberr"); | |
194 | sprintf(dbf_text, "%2x,%2x", count, tmp_count); | |
195 | QDIO_DBF_TEXT3(1, trace, dbf_text); | |
196 | sprintf(dbf_text, "%d,%d", ccq, nr); | |
197 | QDIO_DBF_TEXT3(1, trace, dbf_text); | |
198 | ||
199 | q->handler(q->irq_ptr->cdev, | |
200 | QDIO_ERROR_ACTIVATE_CHECK_CONDITION, | |
201 | 0, -1, -1, q->irq_ptr->int_parm); | |
202 | return 0; | |
203 | } | |
204 | WARN_ON(tmp_count); | |
205 | return count - tmp_count; | |
206 | } | |
207 | ||
208 | /* returns number of examined buffers and their common state in *state */ | |
209 | static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr, | |
210 | unsigned char *state, unsigned int count) | |
211 | { | |
212 | unsigned char __state = 0; | |
213 | int i; | |
214 | ||
215 | BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK); | |
216 | BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q); | |
217 | ||
218 | if (is_qebsm(q)) | |
219 | return qdio_do_eqbs(q, state, bufnr, count); | |
220 | ||
221 | for (i = 0; i < count; i++) { | |
222 | if (!__state) | |
223 | __state = q->slsb.val[bufnr]; | |
224 | else if (q->slsb.val[bufnr] != __state) | |
225 | break; | |
226 | bufnr = next_buf(bufnr); | |
227 | } | |
228 | *state = __state; | |
229 | return i; | |
230 | } | |
231 | ||
232 | inline int get_buf_state(struct qdio_q *q, unsigned int bufnr, | |
233 | unsigned char *state) | |
234 | { | |
235 | return get_buf_states(q, bufnr, state, 1); | |
236 | } | |
237 | ||
238 | /* wrap-around safe setting of slsb states, returns number of changed buffers */ | |
239 | static inline int set_buf_states(struct qdio_q *q, int bufnr, | |
240 | unsigned char state, int count) | |
241 | { | |
242 | int i; | |
243 | ||
244 | BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK); | |
245 | BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q); | |
246 | ||
247 | if (is_qebsm(q)) | |
248 | return qdio_do_sqbs(q, state, bufnr, count); | |
249 | ||
250 | for (i = 0; i < count; i++) { | |
251 | xchg(&q->slsb.val[bufnr], state); | |
252 | bufnr = next_buf(bufnr); | |
253 | } | |
254 | return count; | |
255 | } | |
256 | ||
257 | static inline int set_buf_state(struct qdio_q *q, int bufnr, | |
258 | unsigned char state) | |
259 | { | |
260 | return set_buf_states(q, bufnr, state, 1); | |
261 | } | |
262 | ||
263 | /* set slsb states to initial state */ | |
264 | void qdio_init_buf_states(struct qdio_irq *irq_ptr) | |
265 | { | |
266 | struct qdio_q *q; | |
267 | int i; | |
268 | ||
269 | for_each_input_queue(irq_ptr, q, i) | |
270 | set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT, | |
271 | QDIO_MAX_BUFFERS_PER_Q); | |
272 | for_each_output_queue(irq_ptr, q, i) | |
273 | set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT, | |
274 | QDIO_MAX_BUFFERS_PER_Q); | |
275 | } | |
276 | ||
277 | static int qdio_siga_sync(struct qdio_q *q, unsigned int output, | |
278 | unsigned int input) | |
279 | { | |
280 | int cc; | |
281 | ||
282 | if (!need_siga_sync(q)) | |
283 | return 0; | |
284 | ||
285 | qdio_perf_stat_inc(&perf_stats.siga_sync); | |
286 | ||
287 | cc = do_siga_sync(q->irq_ptr->schid, output, input); | |
288 | if (cc) { | |
289 | QDIO_DBF_TEXT4(0, trace, "sigasync"); | |
290 | QDIO_DBF_HEX4(0, trace, &q, sizeof(void *)); | |
291 | QDIO_DBF_HEX3(0, trace, &cc, sizeof(int *)); | |
292 | } | |
293 | return cc; | |
294 | } | |
295 | ||
296 | inline int qdio_siga_sync_q(struct qdio_q *q) | |
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 | ||
314 | static inline int qdio_do_siga_output(struct qdio_q *q, unsigned int *busy_bit) | |
315 | { | |
316 | unsigned int fc = 0; | |
317 | unsigned long schid; | |
318 | ||
319 | if (!is_qebsm(q)) | |
320 | schid = *((u32 *)&q->irq_ptr->schid); | |
321 | else { | |
322 | schid = q->irq_ptr->sch_token; | |
323 | fc |= 0x80; | |
324 | } | |
325 | return do_siga_output(schid, q->mask, busy_bit, fc); | |
326 | } | |
327 | ||
328 | static int qdio_siga_output(struct qdio_q *q) | |
329 | { | |
330 | int cc; | |
331 | u32 busy_bit; | |
332 | u64 start_time = 0; | |
333 | ||
334 | QDIO_DBF_TEXT5(0, trace, "sigaout"); | |
335 | QDIO_DBF_HEX5(0, trace, &q, sizeof(void *)); | |
336 | ||
337 | qdio_perf_stat_inc(&perf_stats.siga_out); | |
338 | again: | |
339 | cc = qdio_do_siga_output(q, &busy_bit); | |
340 | if (queue_type(q) == QDIO_IQDIO_QFMT && cc == 2 && busy_bit) { | |
341 | if (!start_time) | |
342 | start_time = get_usecs(); | |
343 | else if ((get_usecs() - start_time) < QDIO_BUSY_BIT_PATIENCE) | |
344 | goto again; | |
345 | } | |
346 | ||
347 | if (cc == 2 && busy_bit) | |
348 | cc |= QDIO_ERROR_SIGA_BUSY; | |
349 | if (cc) | |
350 | QDIO_DBF_HEX3(0, trace, &cc, sizeof(int *)); | |
351 | return cc; | |
352 | } | |
353 | ||
354 | static inline int qdio_siga_input(struct qdio_q *q) | |
355 | { | |
356 | int cc; | |
357 | ||
358 | QDIO_DBF_TEXT4(0, trace, "sigain"); | |
359 | QDIO_DBF_HEX4(0, trace, &q, sizeof(void *)); | |
360 | ||
361 | qdio_perf_stat_inc(&perf_stats.siga_in); | |
362 | ||
363 | cc = do_siga_input(q->irq_ptr->schid, q->mask); | |
364 | if (cc) | |
365 | QDIO_DBF_HEX3(0, trace, &cc, sizeof(int *)); | |
366 | return cc; | |
367 | } | |
368 | ||
369 | /* called from thinint inbound handler */ | |
370 | void qdio_sync_after_thinint(struct qdio_q *q) | |
371 | { | |
372 | if (pci_out_supported(q)) { | |
373 | if (need_siga_sync_thinint(q)) | |
374 | qdio_siga_sync_all(q); | |
375 | else if (need_siga_sync_out_thinint(q)) | |
376 | qdio_siga_sync_out(q); | |
377 | } else | |
378 | qdio_siga_sync_q(q); | |
379 | } | |
380 | ||
381 | inline void qdio_stop_polling(struct qdio_q *q) | |
382 | { | |
383 | spin_lock_bh(&q->u.in.lock); | |
384 | if (!q->u.in.polling) { | |
385 | spin_unlock_bh(&q->u.in.lock); | |
386 | return; | |
387 | } | |
388 | q->u.in.polling = 0; | |
389 | qdio_perf_stat_inc(&perf_stats.debug_stop_polling); | |
390 | ||
391 | /* show the card that we are not polling anymore */ | |
392 | set_buf_state(q, q->last_move_ftc, SLSB_P_INPUT_NOT_INIT); | |
393 | spin_unlock_bh(&q->u.in.lock); | |
394 | } | |
395 | ||
396 | static void announce_buffer_error(struct qdio_q *q) | |
397 | { | |
398 | char dbf_text[15]; | |
399 | ||
400 | if (q->is_input_q) | |
401 | QDIO_DBF_TEXT3(1, trace, "inperr"); | |
402 | else | |
403 | QDIO_DBF_TEXT3(0, trace, "outperr"); | |
404 | ||
405 | sprintf(dbf_text, "%x-%x-%x", q->first_to_check, | |
406 | q->sbal[q->first_to_check]->element[14].flags, | |
407 | q->sbal[q->first_to_check]->element[15].flags); | |
408 | QDIO_DBF_TEXT3(1, trace, dbf_text); | |
409 | QDIO_DBF_HEX2(1, trace, q->sbal[q->first_to_check], 256); | |
410 | ||
411 | q->qdio_error = QDIO_ERROR_SLSB_STATE; | |
412 | } | |
413 | ||
414 | static int get_inbound_buffer_frontier(struct qdio_q *q) | |
415 | { | |
416 | int count, stop; | |
417 | unsigned char state; | |
418 | ||
419 | /* | |
420 | * If we still poll don't update last_move_ftc, keep the | |
421 | * previously ACK buffer there. | |
422 | */ | |
423 | if (!q->u.in.polling) | |
424 | q->last_move_ftc = q->first_to_check; | |
425 | ||
426 | /* | |
427 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved | |
428 | * would return 0. | |
429 | */ | |
430 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); | |
431 | stop = add_buf(q->first_to_check, count); | |
432 | ||
433 | /* | |
434 | * No siga sync here, as a PCI or we after a thin interrupt | |
435 | * will sync the queues. | |
436 | */ | |
437 | ||
438 | /* need to set count to 1 for non-qebsm */ | |
439 | if (!is_qebsm(q)) | |
440 | count = 1; | |
441 | ||
442 | check_next: | |
443 | if (q->first_to_check == stop) | |
444 | goto out; | |
445 | ||
446 | count = get_buf_states(q, q->first_to_check, &state, count); | |
447 | if (!count) | |
448 | goto out; | |
449 | ||
450 | switch (state) { | |
451 | case SLSB_P_INPUT_PRIMED: | |
452 | QDIO_DBF_TEXT5(0, trace, "inptprim"); | |
453 | ||
454 | /* | |
455 | * Only ACK the first buffer. The ACK will be removed in | |
456 | * qdio_stop_polling. | |
457 | */ | |
458 | if (q->u.in.polling) | |
459 | state = SLSB_P_INPUT_NOT_INIT; | |
460 | else { | |
461 | q->u.in.polling = 1; | |
462 | state = SLSB_P_INPUT_ACK; | |
463 | } | |
464 | set_buf_state(q, q->first_to_check, state); | |
465 | ||
466 | /* | |
467 | * Need to change all PRIMED buffers to NOT_INIT, otherwise | |
468 | * we're loosing initiative in the thinint code. | |
469 | */ | |
470 | if (count > 1) | |
471 | set_buf_states(q, next_buf(q->first_to_check), | |
472 | SLSB_P_INPUT_NOT_INIT, count - 1); | |
473 | ||
474 | /* | |
475 | * No siga-sync needed for non-qebsm here, as the inbound queue | |
476 | * will be synced on the next siga-r, resp. | |
477 | * tiqdio_is_inbound_q_done will do the siga-sync. | |
478 | */ | |
479 | q->first_to_check = add_buf(q->first_to_check, count); | |
480 | atomic_sub(count, &q->nr_buf_used); | |
481 | goto check_next; | |
482 | case SLSB_P_INPUT_ERROR: | |
483 | announce_buffer_error(q); | |
484 | /* process the buffer, the upper layer will take care of it */ | |
485 | q->first_to_check = add_buf(q->first_to_check, count); | |
486 | atomic_sub(count, &q->nr_buf_used); | |
487 | break; | |
488 | case SLSB_CU_INPUT_EMPTY: | |
489 | case SLSB_P_INPUT_NOT_INIT: | |
490 | case SLSB_P_INPUT_ACK: | |
491 | QDIO_DBF_TEXT5(0, trace, "inpnipro"); | |
492 | break; | |
493 | default: | |
494 | BUG(); | |
495 | } | |
496 | out: | |
497 | QDIO_DBF_HEX4(0, trace, &q->first_to_check, sizeof(int)); | |
498 | return q->first_to_check; | |
499 | } | |
500 | ||
501 | int qdio_inbound_q_moved(struct qdio_q *q) | |
502 | { | |
503 | int bufnr; | |
504 | ||
505 | bufnr = get_inbound_buffer_frontier(q); | |
506 | ||
507 | if ((bufnr != q->last_move_ftc) || q->qdio_error) { | |
508 | if (!need_siga_sync(q) && !pci_out_supported(q)) | |
509 | q->u.in.timestamp = get_usecs(); | |
510 | ||
511 | QDIO_DBF_TEXT4(0, trace, "inhasmvd"); | |
512 | QDIO_DBF_HEX4(0, trace, &q, sizeof(void *)); | |
513 | return 1; | |
514 | } else | |
515 | return 0; | |
516 | } | |
517 | ||
518 | static int qdio_inbound_q_done(struct qdio_q *q) | |
519 | { | |
520 | unsigned char state; | |
521 | #ifdef CONFIG_QDIO_DEBUG | |
522 | char dbf_text[15]; | |
523 | #endif | |
524 | ||
525 | if (!atomic_read(&q->nr_buf_used)) | |
526 | return 1; | |
527 | ||
528 | /* | |
529 | * We need that one for synchronization with the adapter, as it | |
530 | * does a kind of PCI avoidance. | |
531 | */ | |
532 | qdio_siga_sync_q(q); | |
533 | ||
534 | get_buf_state(q, q->first_to_check, &state); | |
535 | if (state == SLSB_P_INPUT_PRIMED) | |
536 | /* we got something to do */ | |
537 | return 0; | |
538 | ||
539 | /* on VM, we don't poll, so the q is always done here */ | |
540 | if (need_siga_sync(q) || pci_out_supported(q)) | |
541 | return 1; | |
542 | ||
543 | /* | |
544 | * At this point we know, that inbound first_to_check | |
545 | * has (probably) not moved (see qdio_inbound_processing). | |
546 | */ | |
547 | if (get_usecs() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) { | |
548 | #ifdef CONFIG_QDIO_DEBUG | |
549 | QDIO_DBF_TEXT4(0, trace, "inqisdon"); | |
550 | QDIO_DBF_HEX4(0, trace, &q, sizeof(void *)); | |
551 | sprintf(dbf_text, "pf%02x", q->first_to_check); | |
552 | QDIO_DBF_TEXT4(0, trace, dbf_text); | |
553 | #endif /* CONFIG_QDIO_DEBUG */ | |
554 | return 1; | |
555 | } else { | |
556 | #ifdef CONFIG_QDIO_DEBUG | |
557 | QDIO_DBF_TEXT4(0, trace, "inqisntd"); | |
558 | QDIO_DBF_HEX4(0, trace, &q, sizeof(void *)); | |
559 | sprintf(dbf_text, "pf%02x", q->first_to_check); | |
560 | QDIO_DBF_TEXT4(0, trace, dbf_text); | |
561 | #endif /* CONFIG_QDIO_DEBUG */ | |
562 | return 0; | |
563 | } | |
564 | } | |
565 | ||
566 | void qdio_kick_inbound_handler(struct qdio_q *q) | |
567 | { | |
568 | int count, start, end; | |
569 | #ifdef CONFIG_QDIO_DEBUG | |
570 | char dbf_text[15]; | |
571 | #endif | |
572 | ||
573 | qdio_perf_stat_inc(&perf_stats.inbound_handler); | |
574 | ||
575 | start = q->first_to_kick; | |
576 | end = q->first_to_check; | |
577 | if (end >= start) | |
578 | count = end - start; | |
579 | else | |
580 | count = end + QDIO_MAX_BUFFERS_PER_Q - start; | |
581 | ||
582 | #ifdef CONFIG_QDIO_DEBUG | |
583 | sprintf(dbf_text, "s=%2xc=%2x", start, count); | |
584 | QDIO_DBF_TEXT4(0, trace, dbf_text); | |
585 | #endif /* CONFIG_QDIO_DEBUG */ | |
586 | ||
587 | if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) | |
588 | return; | |
589 | ||
590 | q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, | |
591 | start, count, q->irq_ptr->int_parm); | |
592 | ||
593 | /* for the next time */ | |
594 | q->first_to_kick = q->first_to_check; | |
595 | q->qdio_error = 0; | |
596 | } | |
597 | ||
598 | static void __qdio_inbound_processing(struct qdio_q *q) | |
599 | { | |
600 | qdio_perf_stat_inc(&perf_stats.tasklet_inbound); | |
601 | again: | |
602 | if (!qdio_inbound_q_moved(q)) | |
603 | return; | |
604 | ||
605 | qdio_kick_inbound_handler(q); | |
606 | ||
607 | if (!qdio_inbound_q_done(q)) | |
608 | /* means poll time is not yet over */ | |
609 | goto again; | |
610 | ||
611 | qdio_stop_polling(q); | |
612 | /* | |
613 | * We need to check again to not lose initiative after | |
614 | * resetting the ACK state. | |
615 | */ | |
616 | if (!qdio_inbound_q_done(q)) | |
617 | goto again; | |
618 | } | |
619 | ||
620 | /* inbound tasklet */ | |
621 | void qdio_inbound_processing(unsigned long data) | |
622 | { | |
623 | struct qdio_q *q = (struct qdio_q *)data; | |
624 | __qdio_inbound_processing(q); | |
625 | } | |
626 | ||
627 | static int get_outbound_buffer_frontier(struct qdio_q *q) | |
628 | { | |
629 | int count, stop; | |
630 | unsigned char state; | |
631 | ||
632 | if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) || | |
633 | (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q))) | |
634 | qdio_siga_sync_q(q); | |
635 | ||
636 | /* | |
637 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved | |
638 | * would return 0. | |
639 | */ | |
640 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); | |
641 | stop = add_buf(q->first_to_check, count); | |
642 | ||
643 | /* need to set count to 1 for non-qebsm */ | |
644 | if (!is_qebsm(q)) | |
645 | count = 1; | |
646 | ||
647 | check_next: | |
648 | if (q->first_to_check == stop) | |
649 | return q->first_to_check; | |
650 | ||
651 | count = get_buf_states(q, q->first_to_check, &state, count); | |
652 | if (!count) | |
653 | return q->first_to_check; | |
654 | ||
655 | switch (state) { | |
656 | case SLSB_P_OUTPUT_EMPTY: | |
657 | /* the adapter got it */ | |
658 | QDIO_DBF_TEXT5(0, trace, "outpempt"); | |
659 | ||
660 | atomic_sub(count, &q->nr_buf_used); | |
661 | q->first_to_check = add_buf(q->first_to_check, count); | |
662 | /* | |
663 | * We fetch all buffer states at once. get_buf_states may | |
664 | * return count < stop. For QEBSM we do not loop. | |
665 | */ | |
666 | if (is_qebsm(q)) | |
667 | break; | |
668 | goto check_next; | |
669 | case SLSB_P_OUTPUT_ERROR: | |
670 | announce_buffer_error(q); | |
671 | /* process the buffer, the upper layer will take care of it */ | |
672 | q->first_to_check = add_buf(q->first_to_check, count); | |
673 | atomic_sub(count, &q->nr_buf_used); | |
674 | break; | |
675 | case SLSB_CU_OUTPUT_PRIMED: | |
676 | /* the adapter has not fetched the output yet */ | |
677 | QDIO_DBF_TEXT5(0, trace, "outpprim"); | |
678 | break; | |
679 | case SLSB_P_OUTPUT_NOT_INIT: | |
680 | case SLSB_P_OUTPUT_HALTED: | |
681 | break; | |
682 | default: | |
683 | BUG(); | |
684 | } | |
685 | return q->first_to_check; | |
686 | } | |
687 | ||
688 | /* all buffers processed? */ | |
689 | static inline int qdio_outbound_q_done(struct qdio_q *q) | |
690 | { | |
691 | return atomic_read(&q->nr_buf_used) == 0; | |
692 | } | |
693 | ||
694 | static inline int qdio_outbound_q_moved(struct qdio_q *q) | |
695 | { | |
696 | int bufnr; | |
697 | ||
698 | bufnr = get_outbound_buffer_frontier(q); | |
699 | ||
700 | if ((bufnr != q->last_move_ftc) || q->qdio_error) { | |
701 | q->last_move_ftc = bufnr; | |
702 | QDIO_DBF_TEXT4(0, trace, "oqhasmvd"); | |
703 | QDIO_DBF_HEX4(0, trace, &q, sizeof(void *)); | |
704 | return 1; | |
705 | } else | |
706 | return 0; | |
707 | } | |
708 | ||
709 | /* | |
710 | * VM could present us cc=2 and busy bit set on SIGA-write | |
711 | * during reconfiguration of their Guest LAN (only in iqdio mode, | |
712 | * otherwise qdio is asynchronous and cc=2 and busy bit there will take | |
713 | * the queues down immediately). | |
714 | * | |
715 | * Therefore qdio_siga_output will try for a short time constantly, | |
716 | * if such a condition occurs. If it doesn't change, it will | |
717 | * increase the busy_siga_counter and save the timestamp, and | |
718 | * schedule the queue for later processing. qdio_outbound_processing | |
719 | * will check out the counter. If non-zero, it will call qdio_kick_outbound_q | |
720 | * as often as the value of the counter. This will attempt further SIGA | |
721 | * instructions. For each successful SIGA, the counter is | |
722 | * decreased, for failing SIGAs the counter remains the same, after | |
723 | * all. After some time of no movement, qdio_kick_outbound_q will | |
724 | * finally fail and reflect corresponding error codes to call | |
725 | * the upper layer module and have it take the queues down. | |
726 | * | |
727 | * Note that this is a change from the original HiperSockets design | |
728 | * (saying cc=2 and busy bit means take the queues down), but in | |
729 | * these days Guest LAN didn't exist... excessive cc=2 with busy bit | |
730 | * conditions will still take the queues down, but the threshold is | |
731 | * higher due to the Guest LAN environment. | |
732 | * | |
733 | * Called from outbound tasklet and do_QDIO handler. | |
734 | */ | |
735 | static void qdio_kick_outbound_q(struct qdio_q *q) | |
736 | { | |
737 | int rc; | |
738 | #ifdef CONFIG_QDIO_DEBUG | |
739 | char dbf_text[15]; | |
740 | ||
741 | QDIO_DBF_TEXT5(0, trace, "kickoutq"); | |
742 | QDIO_DBF_HEX5(0, trace, &q, sizeof(void *)); | |
743 | #endif /* CONFIG_QDIO_DEBUG */ | |
744 | ||
745 | if (!need_siga_out(q)) | |
746 | return; | |
747 | ||
748 | rc = qdio_siga_output(q); | |
749 | switch (rc) { | |
750 | case 0: | |
751 | /* went smooth this time, reset timestamp */ | |
752 | q->u.out.timestamp = 0; | |
753 | ||
754 | /* TODO: improve error handling for CC=0 case */ | |
755 | #ifdef CONFIG_QDIO_DEBUG | |
756 | QDIO_DBF_TEXT3(0, trace, "cc2reslv"); | |
757 | sprintf(dbf_text, "%4x%2x%2x", q->irq_ptr->schid.sch_no, q->nr, | |
758 | atomic_read(&q->u.out.busy_siga_counter)); | |
759 | QDIO_DBF_TEXT3(0, trace, dbf_text); | |
760 | #endif /* CONFIG_QDIO_DEBUG */ | |
761 | break; | |
762 | /* cc=2 and busy bit */ | |
763 | case (2 | QDIO_ERROR_SIGA_BUSY): | |
764 | atomic_inc(&q->u.out.busy_siga_counter); | |
765 | ||
766 | /* if the last siga was successful, save timestamp here */ | |
767 | if (!q->u.out.timestamp) | |
768 | q->u.out.timestamp = get_usecs(); | |
769 | ||
770 | /* if we're in time, don't touch qdio_error */ | |
771 | if (get_usecs() - q->u.out.timestamp < QDIO_BUSY_BIT_GIVE_UP) { | |
772 | tasklet_schedule(&q->tasklet); | |
773 | break; | |
774 | } | |
775 | QDIO_DBF_TEXT2(0, trace, "cc2REPRT"); | |
776 | #ifdef CONFIG_QDIO_DEBUG | |
777 | sprintf(dbf_text, "%4x%2x%2x", q->irq_ptr->schid.sch_no, q->nr, | |
778 | atomic_read(&q->u.out.busy_siga_counter)); | |
779 | QDIO_DBF_TEXT3(0, trace, dbf_text); | |
780 | #endif /* CONFIG_QDIO_DEBUG */ | |
781 | default: | |
782 | /* for plain cc=1, 2 or 3 */ | |
783 | q->qdio_error = rc; | |
784 | } | |
785 | } | |
786 | ||
787 | static void qdio_kick_outbound_handler(struct qdio_q *q) | |
788 | { | |
789 | int start, end, count; | |
790 | #ifdef CONFIG_QDIO_DEBUG | |
791 | char dbf_text[15]; | |
792 | #endif | |
793 | ||
794 | start = q->first_to_kick; | |
795 | end = q->last_move_ftc; | |
796 | if (end >= start) | |
797 | count = end - start; | |
798 | else | |
799 | count = end + QDIO_MAX_BUFFERS_PER_Q - start; | |
800 | ||
801 | #ifdef CONFIG_QDIO_DEBUG | |
802 | QDIO_DBF_TEXT4(0, trace, "kickouth"); | |
803 | QDIO_DBF_HEX4(0, trace, &q, sizeof(void *)); | |
804 | ||
805 | sprintf(dbf_text, "s=%2xc=%2x", start, count); | |
806 | QDIO_DBF_TEXT4(0, trace, dbf_text); | |
807 | #endif /* CONFIG_QDIO_DEBUG */ | |
808 | ||
809 | if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) | |
810 | return; | |
811 | ||
812 | q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count, | |
813 | q->irq_ptr->int_parm); | |
814 | ||
815 | /* for the next time: */ | |
816 | q->first_to_kick = q->last_move_ftc; | |
817 | q->qdio_error = 0; | |
818 | } | |
819 | ||
820 | static void __qdio_outbound_processing(struct qdio_q *q) | |
821 | { | |
822 | int siga_attempts; | |
823 | ||
824 | qdio_perf_stat_inc(&perf_stats.tasklet_outbound); | |
825 | ||
826 | /* see comment in qdio_kick_outbound_q */ | |
827 | siga_attempts = atomic_read(&q->u.out.busy_siga_counter); | |
828 | while (siga_attempts--) { | |
829 | atomic_dec(&q->u.out.busy_siga_counter); | |
830 | qdio_kick_outbound_q(q); | |
831 | } | |
832 | ||
833 | BUG_ON(atomic_read(&q->nr_buf_used) < 0); | |
834 | ||
835 | if (qdio_outbound_q_moved(q)) | |
836 | qdio_kick_outbound_handler(q); | |
837 | ||
838 | if (queue_type(q) == QDIO_ZFCP_QFMT) { | |
839 | if (!pci_out_supported(q) && !qdio_outbound_q_done(q)) | |
840 | tasklet_schedule(&q->tasklet); | |
841 | return; | |
842 | } | |
843 | ||
844 | /* bail out for HiperSockets unicast queues */ | |
845 | if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q)) | |
846 | return; | |
847 | ||
848 | if (q->u.out.pci_out_enabled) | |
849 | return; | |
850 | ||
851 | /* | |
852 | * Now we know that queue type is either qeth without pci enabled | |
853 | * or HiperSockets multicast. Make sure buffer switch from PRIMED to | |
854 | * EMPTY is noticed and outbound_handler is called after some time. | |
855 | */ | |
856 | if (qdio_outbound_q_done(q)) | |
857 | del_timer(&q->u.out.timer); | |
858 | else { | |
859 | if (!timer_pending(&q->u.out.timer)) { | |
860 | mod_timer(&q->u.out.timer, jiffies + 10 * HZ); | |
861 | qdio_perf_stat_inc(&perf_stats.debug_tl_out_timer); | |
862 | } | |
863 | } | |
864 | } | |
865 | ||
866 | /* outbound tasklet */ | |
867 | void qdio_outbound_processing(unsigned long data) | |
868 | { | |
869 | struct qdio_q *q = (struct qdio_q *)data; | |
870 | __qdio_outbound_processing(q); | |
871 | } | |
872 | ||
873 | void qdio_outbound_timer(unsigned long data) | |
874 | { | |
875 | struct qdio_q *q = (struct qdio_q *)data; | |
876 | tasklet_schedule(&q->tasklet); | |
877 | } | |
878 | ||
879 | /* called from thinint inbound tasklet */ | |
880 | void qdio_check_outbound_after_thinint(struct qdio_q *q) | |
881 | { | |
882 | struct qdio_q *out; | |
883 | int i; | |
884 | ||
885 | if (!pci_out_supported(q)) | |
886 | return; | |
887 | ||
888 | for_each_output_queue(q->irq_ptr, out, i) | |
889 | if (!qdio_outbound_q_done(out)) | |
890 | tasklet_schedule(&out->tasklet); | |
891 | } | |
892 | ||
893 | static inline void qdio_set_state(struct qdio_irq *irq_ptr, | |
894 | enum qdio_irq_states state) | |
895 | { | |
896 | #ifdef CONFIG_QDIO_DEBUG | |
897 | char dbf_text[15]; | |
898 | ||
899 | QDIO_DBF_TEXT5(0, trace, "newstate"); | |
900 | sprintf(dbf_text, "%4x%4x", irq_ptr->schid.sch_no, state); | |
901 | QDIO_DBF_TEXT5(0, trace, dbf_text); | |
902 | #endif /* CONFIG_QDIO_DEBUG */ | |
903 | ||
904 | irq_ptr->state = state; | |
905 | mb(); | |
906 | } | |
907 | ||
908 | static void qdio_irq_check_sense(struct subchannel_id schid, struct irb *irb) | |
909 | { | |
910 | char dbf_text[15]; | |
911 | ||
912 | if (irb->esw.esw0.erw.cons) { | |
913 | sprintf(dbf_text, "sens%4x", schid.sch_no); | |
914 | QDIO_DBF_TEXT2(1, trace, dbf_text); | |
915 | QDIO_DBF_HEX0(0, trace, irb, 64); | |
916 | QDIO_DBF_HEX0(0, trace, irb->ecw, 64); | |
917 | } | |
918 | } | |
919 | ||
920 | /* PCI interrupt handler */ | |
921 | static void qdio_int_handler_pci(struct qdio_irq *irq_ptr) | |
922 | { | |
923 | int i; | |
924 | struct qdio_q *q; | |
925 | ||
926 | qdio_perf_stat_inc(&perf_stats.pci_int); | |
927 | ||
928 | for_each_input_queue(irq_ptr, q, i) | |
929 | tasklet_schedule(&q->tasklet); | |
930 | ||
931 | if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED)) | |
932 | return; | |
933 | ||
934 | for_each_output_queue(irq_ptr, q, i) { | |
935 | if (qdio_outbound_q_done(q)) | |
936 | continue; | |
937 | ||
938 | if (!siga_syncs_out_pci(q)) | |
939 | qdio_siga_sync_q(q); | |
940 | ||
941 | tasklet_schedule(&q->tasklet); | |
942 | } | |
943 | } | |
944 | ||
945 | static void qdio_handle_activate_check(struct ccw_device *cdev, | |
946 | unsigned long intparm, int cstat, int dstat) | |
947 | { | |
948 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
949 | struct qdio_q *q; | |
950 | char dbf_text[15]; | |
951 | ||
952 | QDIO_DBF_TEXT2(1, trace, "ick2"); | |
953 | sprintf(dbf_text, "%s", cdev->dev.bus_id); | |
954 | QDIO_DBF_TEXT2(1, trace, dbf_text); | |
955 | QDIO_DBF_HEX2(0, trace, &intparm, sizeof(int)); | |
956 | QDIO_DBF_HEX2(0, trace, &dstat, sizeof(int)); | |
957 | QDIO_DBF_HEX2(0, trace, &cstat, sizeof(int)); | |
958 | ||
959 | if (irq_ptr->nr_input_qs) { | |
960 | q = irq_ptr->input_qs[0]; | |
961 | } else if (irq_ptr->nr_output_qs) { | |
962 | q = irq_ptr->output_qs[0]; | |
963 | } else { | |
964 | dump_stack(); | |
965 | goto no_handler; | |
966 | } | |
967 | q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION, | |
968 | 0, -1, -1, irq_ptr->int_parm); | |
969 | no_handler: | |
970 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); | |
971 | } | |
972 | ||
973 | static void qdio_call_shutdown(struct work_struct *work) | |
974 | { | |
975 | struct ccw_device_private *priv; | |
976 | struct ccw_device *cdev; | |
977 | ||
978 | priv = container_of(work, struct ccw_device_private, kick_work); | |
979 | cdev = priv->cdev; | |
980 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
981 | put_device(&cdev->dev); | |
982 | } | |
983 | ||
984 | static void qdio_int_error(struct ccw_device *cdev) | |
985 | { | |
986 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
987 | ||
988 | switch (irq_ptr->state) { | |
989 | case QDIO_IRQ_STATE_INACTIVE: | |
990 | case QDIO_IRQ_STATE_CLEANUP: | |
991 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); | |
992 | break; | |
993 | case QDIO_IRQ_STATE_ESTABLISHED: | |
994 | case QDIO_IRQ_STATE_ACTIVE: | |
995 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); | |
996 | if (get_device(&cdev->dev)) { | |
997 | /* Can't call shutdown from interrupt context. */ | |
998 | PREPARE_WORK(&cdev->private->kick_work, | |
999 | qdio_call_shutdown); | |
1000 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
1001 | } | |
1002 | break; | |
1003 | default: | |
1004 | WARN_ON(1); | |
1005 | } | |
1006 | wake_up(&cdev->private->wait_q); | |
1007 | } | |
1008 | ||
1009 | static int qdio_establish_check_errors(struct ccw_device *cdev, int cstat, | |
1010 | int dstat) | |
1011 | { | |
1012 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1013 | ||
1014 | if (cstat || (dstat & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))) { | |
1015 | QDIO_DBF_TEXT2(1, setup, "eq:ckcon"); | |
1016 | goto error; | |
1017 | } | |
1018 | ||
1019 | if (!(dstat & DEV_STAT_DEV_END)) { | |
1020 | QDIO_DBF_TEXT2(1, setup, "eq:no de"); | |
1021 | goto error; | |
1022 | } | |
1023 | ||
1024 | if (dstat & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) { | |
1025 | QDIO_DBF_TEXT2(1, setup, "eq:badio"); | |
1026 | goto error; | |
1027 | } | |
1028 | return 0; | |
1029 | error: | |
1030 | QDIO_DBF_HEX2(0, trace, &cstat, sizeof(int)); | |
1031 | QDIO_DBF_HEX2(0, trace, &dstat, sizeof(int)); | |
1032 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); | |
1033 | return 1; | |
1034 | } | |
1035 | ||
1036 | static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat, | |
1037 | int dstat) | |
1038 | { | |
1039 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1040 | char dbf_text[15]; | |
1041 | ||
1042 | sprintf(dbf_text, "qehi%4x", cdev->private->schid.sch_no); | |
1043 | QDIO_DBF_TEXT0(0, setup, dbf_text); | |
1044 | QDIO_DBF_TEXT0(0, trace, dbf_text); | |
1045 | ||
1046 | if (!qdio_establish_check_errors(cdev, cstat, dstat)) | |
1047 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED); | |
1048 | } | |
1049 | ||
1050 | /* qdio interrupt handler */ | |
1051 | void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm, | |
1052 | struct irb *irb) | |
1053 | { | |
1054 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1055 | int cstat, dstat; | |
1056 | char dbf_text[15]; | |
1057 | ||
1058 | qdio_perf_stat_inc(&perf_stats.qdio_int); | |
1059 | ||
1060 | if (!intparm || !irq_ptr) { | |
1061 | sprintf(dbf_text, "qihd%4x", cdev->private->schid.sch_no); | |
1062 | QDIO_DBF_TEXT2(1, setup, dbf_text); | |
1063 | return; | |
1064 | } | |
1065 | ||
1066 | if (IS_ERR(irb)) { | |
1067 | switch (PTR_ERR(irb)) { | |
1068 | case -EIO: | |
1069 | sprintf(dbf_text, "ierr%4x", | |
1070 | cdev->private->schid.sch_no); | |
1071 | QDIO_DBF_TEXT2(1, setup, dbf_text); | |
1072 | qdio_int_error(cdev); | |
1073 | return; | |
1074 | case -ETIMEDOUT: | |
1075 | sprintf(dbf_text, "qtoh%4x", | |
1076 | cdev->private->schid.sch_no); | |
1077 | QDIO_DBF_TEXT2(1, setup, dbf_text); | |
1078 | qdio_int_error(cdev); | |
1079 | return; | |
1080 | default: | |
1081 | WARN_ON(1); | |
1082 | return; | |
1083 | } | |
1084 | } | |
1085 | qdio_irq_check_sense(irq_ptr->schid, irb); | |
1086 | ||
1087 | cstat = irb->scsw.cmd.cstat; | |
1088 | dstat = irb->scsw.cmd.dstat; | |
1089 | ||
1090 | switch (irq_ptr->state) { | |
1091 | case QDIO_IRQ_STATE_INACTIVE: | |
1092 | qdio_establish_handle_irq(cdev, cstat, dstat); | |
1093 | break; | |
1094 | ||
1095 | case QDIO_IRQ_STATE_CLEANUP: | |
1096 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1097 | break; | |
1098 | ||
1099 | case QDIO_IRQ_STATE_ESTABLISHED: | |
1100 | case QDIO_IRQ_STATE_ACTIVE: | |
1101 | if (cstat & SCHN_STAT_PCI) { | |
1102 | qdio_int_handler_pci(irq_ptr); | |
1103 | /* no state change so no need to wake up wait_q */ | |
1104 | return; | |
1105 | } | |
1106 | if ((cstat & ~SCHN_STAT_PCI) || dstat) { | |
1107 | qdio_handle_activate_check(cdev, intparm, cstat, | |
1108 | dstat); | |
1109 | break; | |
1110 | } | |
1111 | default: | |
1112 | WARN_ON(1); | |
1113 | } | |
1114 | wake_up(&cdev->private->wait_q); | |
1115 | } | |
1116 | ||
1117 | /** | |
1118 | * qdio_get_ssqd_desc - get qdio subchannel description | |
1119 | * @cdev: ccw device to get description for | |
1120 | * | |
1121 | * Returns a pointer to the saved qdio subchannel description, | |
1122 | * or NULL for not setup qdio devices. | |
1123 | */ | |
1124 | struct qdio_ssqd_desc *qdio_get_ssqd_desc(struct ccw_device *cdev) | |
1125 | { | |
1126 | struct qdio_irq *irq_ptr; | |
1127 | ||
1128 | QDIO_DBF_TEXT0(0, setup, "getssqd"); | |
1129 | ||
1130 | irq_ptr = cdev->private->qdio_data; | |
1131 | if (!irq_ptr) | |
1132 | return NULL; | |
1133 | ||
1134 | return &irq_ptr->ssqd_desc; | |
1135 | } | |
1136 | EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc); | |
1137 | ||
1138 | /** | |
1139 | * qdio_cleanup - shutdown queues and free data structures | |
1140 | * @cdev: associated ccw device | |
1141 | * @how: use halt or clear to shutdown | |
1142 | * | |
1143 | * This function calls qdio_shutdown() for @cdev with method @how | |
1144 | * and on success qdio_free() for @cdev. | |
1145 | */ | |
1146 | int qdio_cleanup(struct ccw_device *cdev, int how) | |
1147 | { | |
1148 | struct qdio_irq *irq_ptr; | |
1149 | char dbf_text[15]; | |
1150 | int rc; | |
1151 | ||
1152 | irq_ptr = cdev->private->qdio_data; | |
1153 | if (!irq_ptr) | |
1154 | return -ENODEV; | |
1155 | ||
1156 | sprintf(dbf_text, "qcln%4x", irq_ptr->schid.sch_no); | |
1157 | QDIO_DBF_TEXT1(0, trace, dbf_text); | |
1158 | QDIO_DBF_TEXT0(0, setup, dbf_text); | |
1159 | ||
1160 | rc = qdio_shutdown(cdev, how); | |
1161 | if (rc == 0) | |
1162 | rc = qdio_free(cdev); | |
1163 | return rc; | |
1164 | } | |
1165 | EXPORT_SYMBOL_GPL(qdio_cleanup); | |
1166 | ||
1167 | static void qdio_shutdown_queues(struct ccw_device *cdev) | |
1168 | { | |
1169 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1170 | struct qdio_q *q; | |
1171 | int i; | |
1172 | ||
1173 | for_each_input_queue(irq_ptr, q, i) | |
1174 | tasklet_disable(&q->tasklet); | |
1175 | ||
1176 | for_each_output_queue(irq_ptr, q, i) { | |
1177 | tasklet_disable(&q->tasklet); | |
1178 | del_timer(&q->u.out.timer); | |
1179 | } | |
1180 | } | |
1181 | ||
1182 | /** | |
1183 | * qdio_shutdown - shut down a qdio subchannel | |
1184 | * @cdev: associated ccw device | |
1185 | * @how: use halt or clear to shutdown | |
1186 | */ | |
1187 | int qdio_shutdown(struct ccw_device *cdev, int how) | |
1188 | { | |
1189 | struct qdio_irq *irq_ptr; | |
1190 | int rc; | |
1191 | unsigned long flags; | |
1192 | char dbf_text[15]; | |
1193 | ||
1194 | irq_ptr = cdev->private->qdio_data; | |
1195 | if (!irq_ptr) | |
1196 | return -ENODEV; | |
1197 | ||
1198 | mutex_lock(&irq_ptr->setup_mutex); | |
1199 | /* | |
1200 | * Subchannel was already shot down. We cannot prevent being called | |
1201 | * twice since cio may trigger a shutdown asynchronously. | |
1202 | */ | |
1203 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { | |
1204 | mutex_unlock(&irq_ptr->setup_mutex); | |
1205 | return 0; | |
1206 | } | |
1207 | ||
1208 | sprintf(dbf_text, "qsqs%4x", irq_ptr->schid.sch_no); | |
1209 | QDIO_DBF_TEXT1(0, trace, dbf_text); | |
1210 | QDIO_DBF_TEXT0(0, setup, dbf_text); | |
1211 | ||
1212 | tiqdio_remove_input_queues(irq_ptr); | |
1213 | qdio_shutdown_queues(cdev); | |
1214 | qdio_shutdown_debug_entries(irq_ptr, cdev); | |
1215 | ||
1216 | /* cleanup subchannel */ | |
1217 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1218 | ||
1219 | if (how & QDIO_FLAG_CLEANUP_USING_CLEAR) | |
1220 | rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP); | |
1221 | else | |
1222 | /* default behaviour is halt */ | |
1223 | rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP); | |
1224 | if (rc) { | |
1225 | sprintf(dbf_text, "sher%4x", irq_ptr->schid.sch_no); | |
1226 | QDIO_DBF_TEXT0(0, setup, dbf_text); | |
1227 | sprintf(dbf_text, "rc=%d", rc); | |
1228 | QDIO_DBF_TEXT0(0, setup, dbf_text); | |
1229 | goto no_cleanup; | |
1230 | } | |
1231 | ||
1232 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP); | |
1233 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1234 | wait_event_interruptible_timeout(cdev->private->wait_q, | |
1235 | irq_ptr->state == QDIO_IRQ_STATE_INACTIVE || | |
1236 | irq_ptr->state == QDIO_IRQ_STATE_ERR, | |
1237 | 10 * HZ); | |
1238 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1239 | ||
1240 | no_cleanup: | |
1241 | qdio_shutdown_thinint(irq_ptr); | |
1242 | ||
1243 | /* restore interrupt handler */ | |
1244 | if ((void *)cdev->handler == (void *)qdio_int_handler) | |
1245 | cdev->handler = irq_ptr->orig_handler; | |
1246 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1247 | ||
1248 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1249 | mutex_unlock(&irq_ptr->setup_mutex); | |
1250 | module_put(THIS_MODULE); | |
1251 | if (rc) | |
1252 | return rc; | |
1253 | return 0; | |
1254 | } | |
1255 | EXPORT_SYMBOL_GPL(qdio_shutdown); | |
1256 | ||
1257 | /** | |
1258 | * qdio_free - free data structures for a qdio subchannel | |
1259 | * @cdev: associated ccw device | |
1260 | */ | |
1261 | int qdio_free(struct ccw_device *cdev) | |
1262 | { | |
1263 | struct qdio_irq *irq_ptr; | |
1264 | char dbf_text[15]; | |
1265 | ||
1266 | irq_ptr = cdev->private->qdio_data; | |
1267 | if (!irq_ptr) | |
1268 | return -ENODEV; | |
1269 | ||
1270 | mutex_lock(&irq_ptr->setup_mutex); | |
1271 | ||
1272 | sprintf(dbf_text, "qfqs%4x", irq_ptr->schid.sch_no); | |
1273 | QDIO_DBF_TEXT1(0, trace, dbf_text); | |
1274 | QDIO_DBF_TEXT0(0, setup, dbf_text); | |
1275 | ||
1276 | cdev->private->qdio_data = NULL; | |
1277 | mutex_unlock(&irq_ptr->setup_mutex); | |
1278 | ||
1279 | qdio_release_memory(irq_ptr); | |
1280 | return 0; | |
1281 | } | |
1282 | EXPORT_SYMBOL_GPL(qdio_free); | |
1283 | ||
1284 | /** | |
1285 | * qdio_initialize - allocate and establish queues for a qdio subchannel | |
1286 | * @init_data: initialization data | |
1287 | * | |
1288 | * This function first allocates queues via qdio_allocate() and on success | |
1289 | * establishes them via qdio_establish(). | |
1290 | */ | |
1291 | int qdio_initialize(struct qdio_initialize *init_data) | |
1292 | { | |
1293 | int rc; | |
1294 | char dbf_text[15]; | |
1295 | ||
1296 | sprintf(dbf_text, "qini%4x", init_data->cdev->private->schid.sch_no); | |
1297 | QDIO_DBF_TEXT0(0, setup, dbf_text); | |
1298 | QDIO_DBF_TEXT0(0, trace, dbf_text); | |
1299 | ||
1300 | rc = qdio_allocate(init_data); | |
1301 | if (rc) | |
1302 | return rc; | |
1303 | ||
1304 | rc = qdio_establish(init_data); | |
1305 | if (rc) | |
1306 | qdio_free(init_data->cdev); | |
1307 | return rc; | |
1308 | } | |
1309 | EXPORT_SYMBOL_GPL(qdio_initialize); | |
1310 | ||
1311 | /** | |
1312 | * qdio_allocate - allocate qdio queues and associated data | |
1313 | * @init_data: initialization data | |
1314 | */ | |
1315 | int qdio_allocate(struct qdio_initialize *init_data) | |
1316 | { | |
1317 | struct qdio_irq *irq_ptr; | |
1318 | char dbf_text[15]; | |
1319 | ||
1320 | sprintf(dbf_text, "qalc%4x", init_data->cdev->private->schid.sch_no); | |
1321 | QDIO_DBF_TEXT0(0, setup, dbf_text); | |
1322 | QDIO_DBF_TEXT0(0, trace, dbf_text); | |
1323 | ||
1324 | if ((init_data->no_input_qs && !init_data->input_handler) || | |
1325 | (init_data->no_output_qs && !init_data->output_handler)) | |
1326 | return -EINVAL; | |
1327 | ||
1328 | if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) || | |
1329 | (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)) | |
1330 | return -EINVAL; | |
1331 | ||
1332 | if ((!init_data->input_sbal_addr_array) || | |
1333 | (!init_data->output_sbal_addr_array)) | |
1334 | return -EINVAL; | |
1335 | ||
1336 | qdio_allocate_do_dbf(init_data); | |
1337 | ||
1338 | /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */ | |
1339 | irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
1340 | if (!irq_ptr) | |
1341 | goto out_err; | |
1342 | QDIO_DBF_TEXT0(0, setup, "irq_ptr:"); | |
1343 | QDIO_DBF_HEX0(0, setup, &irq_ptr, sizeof(void *)); | |
1344 | ||
1345 | mutex_init(&irq_ptr->setup_mutex); | |
1346 | ||
1347 | /* | |
1348 | * Allocate a page for the chsc calls in qdio_establish. | |
1349 | * Must be pre-allocated since a zfcp recovery will call | |
1350 | * qdio_establish. In case of low memory and swap on a zfcp disk | |
1351 | * we may not be able to allocate memory otherwise. | |
1352 | */ | |
1353 | irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL); | |
1354 | if (!irq_ptr->chsc_page) | |
1355 | goto out_rel; | |
1356 | ||
1357 | /* qdr is used in ccw1.cda which is u32 */ | |
1358 | irq_ptr->qdr = kzalloc(sizeof(struct qdr), GFP_KERNEL | GFP_DMA); | |
1359 | if (!irq_ptr->qdr) | |
1360 | goto out_rel; | |
1361 | WARN_ON((unsigned long)irq_ptr->qdr & 0xfff); | |
1362 | ||
1363 | QDIO_DBF_TEXT0(0, setup, "qdr:"); | |
1364 | QDIO_DBF_HEX0(0, setup, &irq_ptr->qdr, sizeof(void *)); | |
1365 | ||
1366 | if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs, | |
1367 | init_data->no_output_qs)) | |
1368 | goto out_rel; | |
1369 | ||
1370 | init_data->cdev->private->qdio_data = irq_ptr; | |
1371 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1372 | return 0; | |
1373 | out_rel: | |
1374 | qdio_release_memory(irq_ptr); | |
1375 | out_err: | |
1376 | return -ENOMEM; | |
1377 | } | |
1378 | EXPORT_SYMBOL_GPL(qdio_allocate); | |
1379 | ||
1380 | /** | |
1381 | * qdio_establish - establish queues on a qdio subchannel | |
1382 | * @init_data: initialization data | |
1383 | */ | |
1384 | int qdio_establish(struct qdio_initialize *init_data) | |
1385 | { | |
1386 | char dbf_text[20]; | |
1387 | struct qdio_irq *irq_ptr; | |
1388 | struct ccw_device *cdev = init_data->cdev; | |
1389 | unsigned long saveflags; | |
1390 | int rc; | |
1391 | ||
1392 | irq_ptr = cdev->private->qdio_data; | |
1393 | if (!irq_ptr) | |
1394 | return -ENODEV; | |
1395 | ||
1396 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1397 | return -EINVAL; | |
1398 | ||
1399 | if (!try_module_get(THIS_MODULE)) | |
1400 | return -EINVAL; | |
1401 | ||
1402 | sprintf(dbf_text, "qest%4x", cdev->private->schid.sch_no); | |
1403 | QDIO_DBF_TEXT0(0, setup, dbf_text); | |
1404 | QDIO_DBF_TEXT0(0, trace, dbf_text); | |
1405 | ||
1406 | mutex_lock(&irq_ptr->setup_mutex); | |
1407 | qdio_setup_irq(init_data); | |
1408 | ||
1409 | rc = qdio_establish_thinint(irq_ptr); | |
1410 | if (rc) { | |
1411 | mutex_unlock(&irq_ptr->setup_mutex); | |
1412 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1413 | return rc; | |
1414 | } | |
1415 | ||
1416 | /* establish q */ | |
1417 | irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd; | |
1418 | irq_ptr->ccw.flags = CCW_FLAG_SLI; | |
1419 | irq_ptr->ccw.count = irq_ptr->equeue.count; | |
1420 | irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr); | |
1421 | ||
1422 | spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); | |
1423 | ccw_device_set_options_mask(cdev, 0); | |
1424 | ||
1425 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0); | |
1426 | if (rc) { | |
1427 | sprintf(dbf_text, "eq:io%4x", irq_ptr->schid.sch_no); | |
1428 | QDIO_DBF_TEXT2(1, setup, dbf_text); | |
1429 | sprintf(dbf_text, "eq:rc%4x", rc); | |
1430 | QDIO_DBF_TEXT2(1, setup, dbf_text); | |
1431 | } | |
1432 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); | |
1433 | ||
1434 | if (rc) { | |
1435 | mutex_unlock(&irq_ptr->setup_mutex); | |
1436 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1437 | return rc; | |
1438 | } | |
1439 | ||
1440 | wait_event_interruptible_timeout(cdev->private->wait_q, | |
1441 | irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED || | |
1442 | irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ); | |
1443 | ||
1444 | if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) { | |
1445 | mutex_unlock(&irq_ptr->setup_mutex); | |
1446 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1447 | return -EIO; | |
1448 | } | |
1449 | ||
1450 | qdio_setup_ssqd_info(irq_ptr); | |
1451 | sprintf(dbf_text, "qib ac%2x", irq_ptr->qib.ac); | |
1452 | QDIO_DBF_TEXT2(0, setup, dbf_text); | |
1453 | ||
1454 | /* qebsm is now setup if available, initialize buffer states */ | |
1455 | qdio_init_buf_states(irq_ptr); | |
1456 | ||
1457 | mutex_unlock(&irq_ptr->setup_mutex); | |
1458 | qdio_print_subchannel_info(irq_ptr, cdev); | |
1459 | qdio_setup_debug_entries(irq_ptr, cdev); | |
1460 | return 0; | |
1461 | } | |
1462 | EXPORT_SYMBOL_GPL(qdio_establish); | |
1463 | ||
1464 | /** | |
1465 | * qdio_activate - activate queues on a qdio subchannel | |
1466 | * @cdev: associated cdev | |
1467 | */ | |
1468 | int qdio_activate(struct ccw_device *cdev) | |
1469 | { | |
1470 | struct qdio_irq *irq_ptr; | |
1471 | int rc; | |
1472 | unsigned long saveflags; | |
1473 | char dbf_text[20]; | |
1474 | ||
1475 | irq_ptr = cdev->private->qdio_data; | |
1476 | if (!irq_ptr) | |
1477 | return -ENODEV; | |
1478 | ||
1479 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1480 | return -EINVAL; | |
1481 | ||
1482 | mutex_lock(&irq_ptr->setup_mutex); | |
1483 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { | |
1484 | rc = -EBUSY; | |
1485 | goto out; | |
1486 | } | |
1487 | ||
1488 | sprintf(dbf_text, "qact%4x", irq_ptr->schid.sch_no); | |
1489 | QDIO_DBF_TEXT2(0, setup, dbf_text); | |
1490 | QDIO_DBF_TEXT2(0, trace, dbf_text); | |
1491 | ||
1492 | irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd; | |
1493 | irq_ptr->ccw.flags = CCW_FLAG_SLI; | |
1494 | irq_ptr->ccw.count = irq_ptr->aqueue.count; | |
1495 | irq_ptr->ccw.cda = 0; | |
1496 | ||
1497 | spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); | |
1498 | ccw_device_set_options(cdev, CCWDEV_REPORT_ALL); | |
1499 | ||
1500 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE, | |
1501 | 0, DOIO_DENY_PREFETCH); | |
1502 | if (rc) { | |
1503 | sprintf(dbf_text, "aq:io%4x", irq_ptr->schid.sch_no); | |
1504 | QDIO_DBF_TEXT2(1, setup, dbf_text); | |
1505 | sprintf(dbf_text, "aq:rc%4x", rc); | |
1506 | QDIO_DBF_TEXT2(1, setup, dbf_text); | |
1507 | } | |
1508 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); | |
1509 | ||
1510 | if (rc) | |
1511 | goto out; | |
1512 | ||
1513 | if (is_thinint_irq(irq_ptr)) | |
1514 | tiqdio_add_input_queues(irq_ptr); | |
1515 | ||
1516 | /* wait for subchannel to become active */ | |
1517 | msleep(5); | |
1518 | ||
1519 | switch (irq_ptr->state) { | |
1520 | case QDIO_IRQ_STATE_STOPPED: | |
1521 | case QDIO_IRQ_STATE_ERR: | |
1522 | mutex_unlock(&irq_ptr->setup_mutex); | |
1523 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1524 | return -EIO; | |
1525 | default: | |
1526 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE); | |
1527 | rc = 0; | |
1528 | } | |
1529 | out: | |
1530 | mutex_unlock(&irq_ptr->setup_mutex); | |
1531 | return rc; | |
1532 | } | |
1533 | EXPORT_SYMBOL_GPL(qdio_activate); | |
1534 | ||
1535 | static inline int buf_in_between(int bufnr, int start, int count) | |
1536 | { | |
1537 | int end = add_buf(start, count); | |
1538 | ||
1539 | if (end > start) { | |
1540 | if (bufnr >= start && bufnr < end) | |
1541 | return 1; | |
1542 | else | |
1543 | return 0; | |
1544 | } | |
1545 | ||
1546 | /* wrap-around case */ | |
1547 | if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) || | |
1548 | (bufnr < end)) | |
1549 | return 1; | |
1550 | else | |
1551 | return 0; | |
1552 | } | |
1553 | ||
1554 | /** | |
1555 | * handle_inbound - reset processed input buffers | |
1556 | * @q: queue containing the buffers | |
1557 | * @callflags: flags | |
1558 | * @bufnr: first buffer to process | |
1559 | * @count: how many buffers are emptied | |
1560 | */ | |
1561 | static void handle_inbound(struct qdio_q *q, unsigned int callflags, | |
1562 | int bufnr, int count) | |
1563 | { | |
1564 | unsigned long flags; | |
1565 | int used, rc; | |
1566 | ||
1567 | /* | |
1568 | * do_QDIO could run in parallel with the queue tasklet so the | |
1569 | * upper-layer programm could empty the ACK'ed buffer here. | |
1570 | * If that happens we must clear the polling flag, otherwise | |
1571 | * qdio_stop_polling() could set the buffer to NOT_INIT after | |
1572 | * it was set to EMPTY which would kill us. | |
1573 | */ | |
1574 | spin_lock_irqsave(&q->u.in.lock, flags); | |
1575 | if (q->u.in.polling) | |
1576 | if (buf_in_between(q->last_move_ftc, bufnr, count)) | |
1577 | q->u.in.polling = 0; | |
1578 | ||
1579 | count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count); | |
1580 | spin_unlock_irqrestore(&q->u.in.lock, flags); | |
1581 | ||
1582 | used = atomic_add_return(count, &q->nr_buf_used) - count; | |
1583 | BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q); | |
1584 | ||
1585 | /* no need to signal as long as the adapter had free buffers */ | |
1586 | if (used) | |
1587 | return; | |
1588 | ||
1589 | if (need_siga_in(q)) { | |
1590 | rc = qdio_siga_input(q); | |
1591 | if (rc) | |
1592 | q->qdio_error = rc; | |
1593 | } | |
1594 | } | |
1595 | ||
1596 | /** | |
1597 | * handle_outbound - process filled outbound buffers | |
1598 | * @q: queue containing the buffers | |
1599 | * @callflags: flags | |
1600 | * @bufnr: first buffer to process | |
1601 | * @count: how many buffers are filled | |
1602 | */ | |
1603 | static void handle_outbound(struct qdio_q *q, unsigned int callflags, | |
1604 | int bufnr, int count) | |
1605 | { | |
1606 | unsigned char state; | |
1607 | int used; | |
1608 | ||
1609 | qdio_perf_stat_inc(&perf_stats.outbound_handler); | |
1610 | ||
1611 | count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count); | |
1612 | used = atomic_add_return(count, &q->nr_buf_used); | |
1613 | BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q); | |
1614 | ||
1615 | if (callflags & QDIO_FLAG_PCI_OUT) | |
1616 | q->u.out.pci_out_enabled = 1; | |
1617 | else | |
1618 | q->u.out.pci_out_enabled = 0; | |
1619 | ||
1620 | if (queue_type(q) == QDIO_IQDIO_QFMT) { | |
1621 | if (multicast_outbound(q)) | |
1622 | qdio_kick_outbound_q(q); | |
1623 | else | |
1624 | /* | |
1625 | * One siga-w per buffer required for unicast | |
1626 | * HiperSockets. | |
1627 | */ | |
1628 | while (count--) | |
1629 | qdio_kick_outbound_q(q); | |
1630 | goto out; | |
1631 | } | |
1632 | ||
1633 | if (need_siga_sync(q)) { | |
1634 | qdio_siga_sync_q(q); | |
1635 | goto out; | |
1636 | } | |
1637 | ||
1638 | /* try to fast requeue buffers */ | |
1639 | get_buf_state(q, prev_buf(bufnr), &state); | |
1640 | if (state != SLSB_CU_OUTPUT_PRIMED) | |
1641 | qdio_kick_outbound_q(q); | |
1642 | else { | |
1643 | QDIO_DBF_TEXT5(0, trace, "fast-req"); | |
1644 | qdio_perf_stat_inc(&perf_stats.fast_requeue); | |
1645 | } | |
1646 | out: | |
1647 | /* Fixme: could wait forever if called from process context */ | |
1648 | tasklet_schedule(&q->tasklet); | |
1649 | } | |
1650 | ||
1651 | /** | |
1652 | * do_QDIO - process input or output buffers | |
1653 | * @cdev: associated ccw_device for the qdio subchannel | |
1654 | * @callflags: input or output and special flags from the program | |
1655 | * @q_nr: queue number | |
1656 | * @bufnr: buffer number | |
1657 | * @count: how many buffers to process | |
1658 | */ | |
1659 | int do_QDIO(struct ccw_device *cdev, unsigned int callflags, | |
1660 | int q_nr, int bufnr, int count) | |
1661 | { | |
1662 | struct qdio_irq *irq_ptr; | |
1663 | #ifdef CONFIG_QDIO_DEBUG | |
1664 | char dbf_text[20]; | |
1665 | ||
1666 | sprintf(dbf_text, "doQD%04x", cdev->private->schid.sch_no); | |
1667 | QDIO_DBF_TEXT3(0, trace, dbf_text); | |
1668 | #endif /* CONFIG_QDIO_DEBUG */ | |
1669 | ||
1670 | if ((bufnr > QDIO_MAX_BUFFERS_PER_Q) || | |
1671 | (count > QDIO_MAX_BUFFERS_PER_Q) || | |
1672 | (q_nr > QDIO_MAX_QUEUES_PER_IRQ)) | |
1673 | return -EINVAL; | |
1674 | ||
1675 | if (!count) | |
1676 | return 0; | |
1677 | ||
1678 | irq_ptr = cdev->private->qdio_data; | |
1679 | if (!irq_ptr) | |
1680 | return -ENODEV; | |
1681 | ||
1682 | #ifdef CONFIG_QDIO_DEBUG | |
1683 | if (callflags & QDIO_FLAG_SYNC_INPUT) | |
1684 | QDIO_DBF_HEX3(0, trace, &irq_ptr->input_qs[q_nr], | |
1685 | sizeof(void *)); | |
1686 | else | |
1687 | QDIO_DBF_HEX3(0, trace, &irq_ptr->output_qs[q_nr], | |
1688 | sizeof(void *)); | |
1689 | ||
1690 | sprintf(dbf_text, "flag%04x", callflags); | |
1691 | QDIO_DBF_TEXT3(0, trace, dbf_text); | |
1692 | sprintf(dbf_text, "qi%02xct%02x", bufnr, count); | |
1693 | QDIO_DBF_TEXT3(0, trace, dbf_text); | |
1694 | #endif /* CONFIG_QDIO_DEBUG */ | |
1695 | ||
1696 | if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE) | |
1697 | return -EBUSY; | |
1698 | ||
1699 | if (callflags & QDIO_FLAG_SYNC_INPUT) | |
1700 | handle_inbound(irq_ptr->input_qs[q_nr], | |
1701 | callflags, bufnr, count); | |
1702 | else if (callflags & QDIO_FLAG_SYNC_OUTPUT) | |
1703 | handle_outbound(irq_ptr->output_qs[q_nr], | |
1704 | callflags, bufnr, count); | |
1705 | else { | |
1706 | QDIO_DBF_TEXT3(1, trace, "doQD:inv"); | |
1707 | return -EINVAL; | |
1708 | } | |
1709 | return 0; | |
1710 | } | |
1711 | EXPORT_SYMBOL_GPL(do_QDIO); | |
1712 | ||
1713 | static int __init init_QDIO(void) | |
1714 | { | |
1715 | int rc; | |
1716 | ||
1717 | rc = qdio_setup_init(); | |
1718 | if (rc) | |
1719 | return rc; | |
1720 | rc = tiqdio_allocate_memory(); | |
1721 | if (rc) | |
1722 | goto out_cache; | |
1723 | rc = qdio_debug_init(); | |
1724 | if (rc) | |
1725 | goto out_ti; | |
1726 | rc = qdio_setup_perf_stats(); | |
1727 | if (rc) | |
1728 | goto out_debug; | |
1729 | rc = tiqdio_register_thinints(); | |
1730 | if (rc) | |
1731 | goto out_perf; | |
1732 | return 0; | |
1733 | ||
1734 | out_perf: | |
1735 | qdio_remove_perf_stats(); | |
1736 | out_debug: | |
1737 | qdio_debug_exit(); | |
1738 | out_ti: | |
1739 | tiqdio_free_memory(); | |
1740 | out_cache: | |
1741 | qdio_setup_exit(); | |
1742 | return rc; | |
1743 | } | |
1744 | ||
1745 | static void __exit exit_QDIO(void) | |
1746 | { | |
1747 | tiqdio_unregister_thinints(); | |
1748 | tiqdio_free_memory(); | |
1749 | qdio_remove_perf_stats(); | |
1750 | qdio_debug_exit(); | |
1751 | qdio_setup_exit(); | |
1752 | } | |
1753 | ||
1754 | module_init(init_QDIO); | |
1755 | module_exit(exit_QDIO); |