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Commit | Line | Data |
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779e6e1c JG |
1 | /* |
2 | * linux/drivers/s390/cio/qdio_main.c | |
3 | * | |
4 | * Linux for s390 qdio support, buffer handling, qdio API and module support. | |
5 | * | |
6 | * Copyright 2000,2008 IBM Corp. | |
7 | * Author(s): Utz Bacher <utz.bacher@de.ibm.com> | |
8 | * Jan Glauber <jang@linux.vnet.ibm.com> | |
9 | * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com> | |
10 | */ | |
11 | #include <linux/module.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/timer.h> | |
15 | #include <linux/delay.h> | |
5a0e3ad6 | 16 | #include <linux/gfp.h> |
30d77c3e | 17 | #include <linux/kernel_stat.h> |
779e6e1c JG |
18 | #include <asm/atomic.h> |
19 | #include <asm/debug.h> | |
20 | #include <asm/qdio.h> | |
21 | ||
22 | #include "cio.h" | |
23 | #include "css.h" | |
24 | #include "device.h" | |
25 | #include "qdio.h" | |
26 | #include "qdio_debug.h" | |
779e6e1c JG |
27 | |
28 | MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\ | |
29 | "Jan Glauber <jang@linux.vnet.ibm.com>"); | |
30 | MODULE_DESCRIPTION("QDIO base support"); | |
31 | MODULE_LICENSE("GPL"); | |
32 | ||
958c0ba4 JG |
33 | static inline int do_siga_sync(unsigned long schid, |
34 | unsigned int out_mask, unsigned int in_mask, | |
35 | unsigned int fc) | |
779e6e1c | 36 | { |
958c0ba4 JG |
37 | register unsigned long __fc asm ("0") = fc; |
38 | register unsigned long __schid asm ("1") = schid; | |
779e6e1c JG |
39 | register unsigned long out asm ("2") = out_mask; |
40 | register unsigned long in asm ("3") = in_mask; | |
41 | int cc; | |
42 | ||
43 | asm volatile( | |
44 | " siga 0\n" | |
45 | " ipm %0\n" | |
46 | " srl %0,28\n" | |
47 | : "=d" (cc) | |
48 | : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc"); | |
49 | return cc; | |
50 | } | |
51 | ||
958c0ba4 JG |
52 | static inline int do_siga_input(unsigned long schid, unsigned int mask, |
53 | unsigned int fc) | |
779e6e1c | 54 | { |
958c0ba4 JG |
55 | register unsigned long __fc asm ("0") = fc; |
56 | register unsigned long __schid asm ("1") = schid; | |
779e6e1c JG |
57 | register unsigned long __mask asm ("2") = mask; |
58 | int cc; | |
59 | ||
60 | asm volatile( | |
61 | " siga 0\n" | |
62 | " ipm %0\n" | |
63 | " srl %0,28\n" | |
64 | : "=d" (cc) | |
65 | : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory"); | |
66 | return cc; | |
67 | } | |
68 | ||
69 | /** | |
70 | * do_siga_output - perform SIGA-w/wt function | |
71 | * @schid: subchannel id or in case of QEBSM the subchannel token | |
72 | * @mask: which output queues to process | |
73 | * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer | |
74 | * @fc: function code to perform | |
75 | * | |
76 | * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION. | |
77 | * Note: For IQDC unicast queues only the highest priority queue is processed. | |
78 | */ | |
79 | static inline int do_siga_output(unsigned long schid, unsigned long mask, | |
7a0b4cbc | 80 | unsigned int *bb, unsigned int fc) |
779e6e1c JG |
81 | { |
82 | register unsigned long __fc asm("0") = fc; | |
83 | register unsigned long __schid asm("1") = schid; | |
84 | register unsigned long __mask asm("2") = mask; | |
85 | int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION; | |
86 | ||
87 | asm volatile( | |
88 | " siga 0\n" | |
89 | "0: ipm %0\n" | |
90 | " srl %0,28\n" | |
91 | "1:\n" | |
92 | EX_TABLE(0b, 1b) | |
93 | : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask) | |
94 | : : "cc", "memory"); | |
95 | *bb = ((unsigned int) __fc) >> 31; | |
96 | return cc; | |
97 | } | |
98 | ||
99 | static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq) | |
100 | { | |
779e6e1c JG |
101 | /* all done or next buffer state different */ |
102 | if (ccq == 0 || ccq == 32) | |
103 | return 0; | |
104 | /* not all buffers processed */ | |
105 | if (ccq == 96 || ccq == 97) | |
106 | return 1; | |
107 | /* notify devices immediately */ | |
22f99347 | 108 | DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq); |
779e6e1c JG |
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 | |
50f769df | 118 | * @auto_ack: automatically acknowledge buffers |
779e6e1c | 119 | * |
73ac36ea | 120 | * Returns the number of successfully extracted equal buffer states. |
779e6e1c JG |
121 | * Stops processing if a state is different from the last buffers state. |
122 | */ | |
123 | static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state, | |
50f769df | 124 | int start, int count, int auto_ack) |
779e6e1c JG |
125 | { |
126 | unsigned int ccq = 0; | |
127 | int tmp_count = count, tmp_start = start; | |
128 | int nr = q->nr; | |
129 | int rc; | |
779e6e1c JG |
130 | |
131 | BUG_ON(!q->irq_ptr->sch_token); | |
6486cda6 | 132 | qperf_inc(q, eqbs); |
779e6e1c JG |
133 | |
134 | if (!q->is_input_q) | |
135 | nr += q->irq_ptr->nr_input_qs; | |
136 | again: | |
50f769df JG |
137 | ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count, |
138 | auto_ack); | |
779e6e1c JG |
139 | rc = qdio_check_ccq(q, ccq); |
140 | ||
141 | /* At least one buffer was processed, return and extract the remaining | |
142 | * buffers later. | |
143 | */ | |
23589d05 | 144 | if ((ccq == 96) && (count != tmp_count)) { |
6486cda6 | 145 | qperf_inc(q, eqbs_partial); |
779e6e1c | 146 | return (count - tmp_count); |
23589d05 | 147 | } |
22f99347 | 148 | |
779e6e1c | 149 | if (rc == 1) { |
22f99347 | 150 | DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq); |
779e6e1c JG |
151 | goto again; |
152 | } | |
153 | ||
154 | if (rc < 0) { | |
22f99347 JG |
155 | DBF_ERROR("%4x EQBS ERROR", SCH_NO(q)); |
156 | DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); | |
779e6e1c JG |
157 | q->handler(q->irq_ptr->cdev, |
158 | QDIO_ERROR_ACTIVATE_CHECK_CONDITION, | |
159 | 0, -1, -1, q->irq_ptr->int_parm); | |
160 | return 0; | |
161 | } | |
162 | return count - tmp_count; | |
163 | } | |
164 | ||
165 | /** | |
166 | * qdio_do_sqbs - set buffer states for QEBSM | |
167 | * @q: queue to manipulate | |
168 | * @state: new state of the buffers | |
169 | * @start: first buffer number to change | |
170 | * @count: how many buffers to change | |
171 | * | |
172 | * Returns the number of successfully changed buffers. | |
173 | * Does retrying until the specified count of buffer states is set or an | |
174 | * error occurs. | |
175 | */ | |
176 | static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start, | |
177 | int count) | |
178 | { | |
179 | unsigned int ccq = 0; | |
180 | int tmp_count = count, tmp_start = start; | |
181 | int nr = q->nr; | |
182 | int rc; | |
779e6e1c | 183 | |
50f769df JG |
184 | if (!count) |
185 | return 0; | |
186 | ||
779e6e1c | 187 | BUG_ON(!q->irq_ptr->sch_token); |
6486cda6 | 188 | qperf_inc(q, sqbs); |
779e6e1c JG |
189 | |
190 | if (!q->is_input_q) | |
191 | nr += q->irq_ptr->nr_input_qs; | |
192 | again: | |
193 | ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count); | |
194 | rc = qdio_check_ccq(q, ccq); | |
195 | if (rc == 1) { | |
22f99347 | 196 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq); |
6486cda6 | 197 | qperf_inc(q, sqbs_partial); |
779e6e1c JG |
198 | goto again; |
199 | } | |
200 | if (rc < 0) { | |
22f99347 JG |
201 | DBF_ERROR("%4x SQBS ERROR", SCH_NO(q)); |
202 | DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); | |
779e6e1c JG |
203 | q->handler(q->irq_ptr->cdev, |
204 | QDIO_ERROR_ACTIVATE_CHECK_CONDITION, | |
205 | 0, -1, -1, q->irq_ptr->int_parm); | |
206 | return 0; | |
207 | } | |
208 | WARN_ON(tmp_count); | |
209 | return count - tmp_count; | |
210 | } | |
211 | ||
212 | /* returns number of examined buffers and their common state in *state */ | |
213 | static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr, | |
50f769df JG |
214 | unsigned char *state, unsigned int count, |
215 | int auto_ack) | |
779e6e1c JG |
216 | { |
217 | unsigned char __state = 0; | |
218 | int i; | |
219 | ||
220 | BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK); | |
221 | BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q); | |
222 | ||
223 | if (is_qebsm(q)) | |
50f769df | 224 | return qdio_do_eqbs(q, state, bufnr, count, auto_ack); |
779e6e1c JG |
225 | |
226 | for (i = 0; i < count; i++) { | |
227 | if (!__state) | |
228 | __state = q->slsb.val[bufnr]; | |
229 | else if (q->slsb.val[bufnr] != __state) | |
230 | break; | |
231 | bufnr = next_buf(bufnr); | |
232 | } | |
233 | *state = __state; | |
234 | return i; | |
235 | } | |
236 | ||
60b5df2f JG |
237 | static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr, |
238 | unsigned char *state, int auto_ack) | |
779e6e1c | 239 | { |
50f769df | 240 | return get_buf_states(q, bufnr, state, 1, auto_ack); |
779e6e1c JG |
241 | } |
242 | ||
243 | /* wrap-around safe setting of slsb states, returns number of changed buffers */ | |
244 | static inline int set_buf_states(struct qdio_q *q, int bufnr, | |
245 | unsigned char state, int count) | |
246 | { | |
247 | int i; | |
248 | ||
249 | BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK); | |
250 | BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q); | |
251 | ||
252 | if (is_qebsm(q)) | |
253 | return qdio_do_sqbs(q, state, bufnr, count); | |
254 | ||
255 | for (i = 0; i < count; i++) { | |
256 | xchg(&q->slsb.val[bufnr], state); | |
257 | bufnr = next_buf(bufnr); | |
258 | } | |
259 | return count; | |
260 | } | |
261 | ||
262 | static inline int set_buf_state(struct qdio_q *q, int bufnr, | |
263 | unsigned char state) | |
264 | { | |
265 | return set_buf_states(q, bufnr, state, 1); | |
266 | } | |
267 | ||
268 | /* set slsb states to initial state */ | |
269 | void qdio_init_buf_states(struct qdio_irq *irq_ptr) | |
270 | { | |
271 | struct qdio_q *q; | |
272 | int i; | |
273 | ||
274 | for_each_input_queue(irq_ptr, q, i) | |
275 | set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT, | |
276 | QDIO_MAX_BUFFERS_PER_Q); | |
277 | for_each_output_queue(irq_ptr, q, i) | |
278 | set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT, | |
279 | QDIO_MAX_BUFFERS_PER_Q); | |
280 | } | |
281 | ||
60b5df2f | 282 | static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output, |
779e6e1c JG |
283 | unsigned int input) |
284 | { | |
958c0ba4 JG |
285 | unsigned long schid = *((u32 *) &q->irq_ptr->schid); |
286 | unsigned int fc = QDIO_SIGA_SYNC; | |
779e6e1c JG |
287 | int cc; |
288 | ||
289 | if (!need_siga_sync(q)) | |
290 | return 0; | |
291 | ||
7a0b4cbc | 292 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr); |
6486cda6 | 293 | qperf_inc(q, siga_sync); |
779e6e1c | 294 | |
958c0ba4 JG |
295 | if (is_qebsm(q)) { |
296 | schid = q->irq_ptr->sch_token; | |
297 | fc |= QDIO_SIGA_QEBSM_FLAG; | |
298 | } | |
299 | ||
300 | cc = do_siga_sync(schid, output, input, fc); | |
110da317 | 301 | if (unlikely(cc)) |
22f99347 | 302 | DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc); |
779e6e1c JG |
303 | return cc; |
304 | } | |
305 | ||
60b5df2f | 306 | static inline int qdio_siga_sync_q(struct qdio_q *q) |
779e6e1c JG |
307 | { |
308 | if (q->is_input_q) | |
309 | return qdio_siga_sync(q, 0, q->mask); | |
310 | else | |
311 | return qdio_siga_sync(q, q->mask, 0); | |
312 | } | |
313 | ||
314 | static inline int qdio_siga_sync_out(struct qdio_q *q) | |
315 | { | |
316 | return qdio_siga_sync(q, ~0U, 0); | |
317 | } | |
318 | ||
319 | static inline int qdio_siga_sync_all(struct qdio_q *q) | |
320 | { | |
321 | return qdio_siga_sync(q, ~0U, ~0U); | |
322 | } | |
323 | ||
7a0b4cbc | 324 | static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit) |
779e6e1c | 325 | { |
958c0ba4 JG |
326 | unsigned long schid = *((u32 *) &q->irq_ptr->schid); |
327 | unsigned int fc = QDIO_SIGA_WRITE; | |
7a0b4cbc JG |
328 | u64 start_time = 0; |
329 | int cc; | |
779e6e1c | 330 | |
7a0b4cbc | 331 | if (is_qebsm(q)) { |
779e6e1c | 332 | schid = q->irq_ptr->sch_token; |
958c0ba4 | 333 | fc |= QDIO_SIGA_QEBSM_FLAG; |
779e6e1c | 334 | } |
779e6e1c | 335 | again: |
7a0b4cbc JG |
336 | cc = do_siga_output(schid, q->mask, busy_bit, fc); |
337 | ||
338 | /* hipersocket busy condition */ | |
110da317 | 339 | if (unlikely(*busy_bit)) { |
7a0b4cbc | 340 | WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2); |
58eb27cd | 341 | |
7a0b4cbc | 342 | if (!start_time) { |
3a601bfe | 343 | start_time = get_clock(); |
7a0b4cbc JG |
344 | goto again; |
345 | } | |
3a601bfe | 346 | if ((get_clock() - start_time) < QDIO_BUSY_BIT_PATIENCE) |
779e6e1c JG |
347 | goto again; |
348 | } | |
779e6e1c JG |
349 | return cc; |
350 | } | |
351 | ||
352 | static inline int qdio_siga_input(struct qdio_q *q) | |
353 | { | |
958c0ba4 JG |
354 | unsigned long schid = *((u32 *) &q->irq_ptr->schid); |
355 | unsigned int fc = QDIO_SIGA_READ; | |
779e6e1c JG |
356 | int cc; |
357 | ||
22f99347 | 358 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr); |
6486cda6 | 359 | qperf_inc(q, siga_read); |
779e6e1c | 360 | |
958c0ba4 JG |
361 | if (is_qebsm(q)) { |
362 | schid = q->irq_ptr->sch_token; | |
363 | fc |= QDIO_SIGA_QEBSM_FLAG; | |
364 | } | |
365 | ||
366 | cc = do_siga_input(schid, q->mask, fc); | |
110da317 | 367 | if (unlikely(cc)) |
22f99347 | 368 | DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc); |
779e6e1c JG |
369 | return cc; |
370 | } | |
371 | ||
60b5df2f | 372 | static inline void qdio_sync_after_thinint(struct qdio_q *q) |
779e6e1c JG |
373 | { |
374 | if (pci_out_supported(q)) { | |
375 | if (need_siga_sync_thinint(q)) | |
376 | qdio_siga_sync_all(q); | |
377 | else if (need_siga_sync_out_thinint(q)) | |
378 | qdio_siga_sync_out(q); | |
379 | } else | |
380 | qdio_siga_sync_q(q); | |
381 | } | |
382 | ||
60b5df2f JG |
383 | int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr, |
384 | unsigned char *state) | |
385 | { | |
386 | qdio_siga_sync_q(q); | |
387 | return get_buf_states(q, bufnr, state, 1, 0); | |
388 | } | |
389 | ||
390 | static inline void qdio_stop_polling(struct qdio_q *q) | |
779e6e1c | 391 | { |
50f769df | 392 | if (!q->u.in.polling) |
779e6e1c | 393 | return; |
50f769df | 394 | |
779e6e1c | 395 | q->u.in.polling = 0; |
6486cda6 | 396 | qperf_inc(q, stop_polling); |
779e6e1c JG |
397 | |
398 | /* show the card that we are not polling anymore */ | |
50f769df | 399 | if (is_qebsm(q)) { |
e85dea0e | 400 | set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, |
50f769df JG |
401 | q->u.in.ack_count); |
402 | q->u.in.ack_count = 0; | |
403 | } else | |
e85dea0e | 404 | set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); |
779e6e1c JG |
405 | } |
406 | ||
d307297f JG |
407 | static inline void account_sbals(struct qdio_q *q, int count) |
408 | { | |
409 | int pos = 0; | |
410 | ||
411 | q->q_stats.nr_sbal_total += count; | |
412 | if (count == QDIO_MAX_BUFFERS_MASK) { | |
413 | q->q_stats.nr_sbals[7]++; | |
414 | return; | |
415 | } | |
416 | while (count >>= 1) | |
417 | pos++; | |
418 | q->q_stats.nr_sbals[pos]++; | |
419 | } | |
420 | ||
50f769df | 421 | static void announce_buffer_error(struct qdio_q *q, int count) |
779e6e1c | 422 | { |
7a0b4cbc | 423 | q->qdio_error |= QDIO_ERROR_SLSB_STATE; |
50f769df JG |
424 | |
425 | /* special handling for no target buffer empty */ | |
426 | if ((!q->is_input_q && | |
427 | (q->sbal[q->first_to_check]->element[15].flags & 0xff) == 0x10)) { | |
6486cda6 | 428 | qperf_inc(q, target_full); |
1d7e1500 | 429 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", |
50f769df JG |
430 | q->first_to_check); |
431 | return; | |
432 | } | |
433 | ||
22f99347 JG |
434 | DBF_ERROR("%4x BUF ERROR", SCH_NO(q)); |
435 | DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr); | |
50f769df | 436 | DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count); |
22f99347 JG |
437 | DBF_ERROR("F14:%2x F15:%2x", |
438 | q->sbal[q->first_to_check]->element[14].flags & 0xff, | |
439 | q->sbal[q->first_to_check]->element[15].flags & 0xff); | |
50f769df | 440 | } |
779e6e1c | 441 | |
50f769df JG |
442 | static inline void inbound_primed(struct qdio_q *q, int count) |
443 | { | |
444 | int new; | |
445 | ||
1d7e1500 | 446 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count); |
50f769df JG |
447 | |
448 | /* for QEBSM the ACK was already set by EQBS */ | |
449 | if (is_qebsm(q)) { | |
450 | if (!q->u.in.polling) { | |
451 | q->u.in.polling = 1; | |
452 | q->u.in.ack_count = count; | |
e85dea0e | 453 | q->u.in.ack_start = q->first_to_check; |
50f769df JG |
454 | return; |
455 | } | |
456 | ||
457 | /* delete the previous ACK's */ | |
e85dea0e | 458 | set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, |
50f769df JG |
459 | q->u.in.ack_count); |
460 | q->u.in.ack_count = count; | |
e85dea0e | 461 | q->u.in.ack_start = q->first_to_check; |
50f769df JG |
462 | return; |
463 | } | |
464 | ||
465 | /* | |
466 | * ACK the newest buffer. The ACK will be removed in qdio_stop_polling | |
467 | * or by the next inbound run. | |
468 | */ | |
469 | new = add_buf(q->first_to_check, count - 1); | |
470 | if (q->u.in.polling) { | |
471 | /* reset the previous ACK but first set the new one */ | |
472 | set_buf_state(q, new, SLSB_P_INPUT_ACK); | |
e85dea0e | 473 | set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); |
3fdf1e18 | 474 | } else { |
50f769df | 475 | q->u.in.polling = 1; |
3fdf1e18 | 476 | set_buf_state(q, new, SLSB_P_INPUT_ACK); |
50f769df JG |
477 | } |
478 | ||
e85dea0e | 479 | q->u.in.ack_start = new; |
50f769df JG |
480 | count--; |
481 | if (!count) | |
482 | return; | |
6541f7b6 JG |
483 | /* need to change ALL buffers to get more interrupts */ |
484 | set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count); | |
779e6e1c JG |
485 | } |
486 | ||
487 | static int get_inbound_buffer_frontier(struct qdio_q *q) | |
488 | { | |
489 | int count, stop; | |
490 | unsigned char state; | |
491 | ||
779e6e1c JG |
492 | /* |
493 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved | |
494 | * would return 0. | |
495 | */ | |
496 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); | |
497 | stop = add_buf(q->first_to_check, count); | |
498 | ||
779e6e1c JG |
499 | if (q->first_to_check == stop) |
500 | goto out; | |
501 | ||
36e3e721 JG |
502 | /* |
503 | * No siga sync here, as a PCI or we after a thin interrupt | |
504 | * already sync'ed the queues. | |
505 | */ | |
50f769df | 506 | count = get_buf_states(q, q->first_to_check, &state, count, 1); |
779e6e1c JG |
507 | if (!count) |
508 | goto out; | |
509 | ||
510 | switch (state) { | |
511 | case SLSB_P_INPUT_PRIMED: | |
50f769df | 512 | inbound_primed(q, count); |
779e6e1c | 513 | q->first_to_check = add_buf(q->first_to_check, count); |
8bcd9b04 | 514 | if (atomic_sub(count, &q->nr_buf_used) == 0) |
6486cda6 | 515 | qperf_inc(q, inbound_queue_full); |
d307297f JG |
516 | if (q->irq_ptr->perf_stat_enabled) |
517 | account_sbals(q, count); | |
36e3e721 | 518 | break; |
779e6e1c | 519 | case SLSB_P_INPUT_ERROR: |
50f769df | 520 | announce_buffer_error(q, count); |
779e6e1c JG |
521 | /* process the buffer, the upper layer will take care of it */ |
522 | q->first_to_check = add_buf(q->first_to_check, count); | |
523 | atomic_sub(count, &q->nr_buf_used); | |
d307297f JG |
524 | if (q->irq_ptr->perf_stat_enabled) |
525 | account_sbals_error(q, count); | |
779e6e1c JG |
526 | break; |
527 | case SLSB_CU_INPUT_EMPTY: | |
528 | case SLSB_P_INPUT_NOT_INIT: | |
529 | case SLSB_P_INPUT_ACK: | |
d307297f JG |
530 | if (q->irq_ptr->perf_stat_enabled) |
531 | q->q_stats.nr_sbal_nop++; | |
22f99347 | 532 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop"); |
779e6e1c JG |
533 | break; |
534 | default: | |
535 | BUG(); | |
536 | } | |
537 | out: | |
779e6e1c JG |
538 | return q->first_to_check; |
539 | } | |
540 | ||
60b5df2f | 541 | static int qdio_inbound_q_moved(struct qdio_q *q) |
779e6e1c JG |
542 | { |
543 | int bufnr; | |
544 | ||
545 | bufnr = get_inbound_buffer_frontier(q); | |
546 | ||
e85dea0e JG |
547 | if ((bufnr != q->last_move) || q->qdio_error) { |
548 | q->last_move = bufnr; | |
27d71602 | 549 | if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR) |
3a601bfe | 550 | q->u.in.timestamp = get_clock(); |
779e6e1c JG |
551 | return 1; |
552 | } else | |
553 | return 0; | |
554 | } | |
555 | ||
9a2c160a | 556 | static inline int qdio_inbound_q_done(struct qdio_q *q) |
779e6e1c | 557 | { |
9a1ce28a | 558 | unsigned char state = 0; |
779e6e1c JG |
559 | |
560 | if (!atomic_read(&q->nr_buf_used)) | |
561 | return 1; | |
562 | ||
779e6e1c | 563 | qdio_siga_sync_q(q); |
50f769df | 564 | get_buf_state(q, q->first_to_check, &state, 0); |
9a2c160a | 565 | |
4c52228d | 566 | if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR) |
9a2c160a | 567 | /* more work coming */ |
779e6e1c JG |
568 | return 0; |
569 | ||
9a2c160a JG |
570 | if (is_thinint_irq(q->irq_ptr)) |
571 | return 1; | |
572 | ||
573 | /* don't poll under z/VM */ | |
574 | if (MACHINE_IS_VM) | |
779e6e1c JG |
575 | return 1; |
576 | ||
577 | /* | |
578 | * At this point we know, that inbound first_to_check | |
579 | * has (probably) not moved (see qdio_inbound_processing). | |
580 | */ | |
3a601bfe | 581 | if (get_clock() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) { |
1d7e1500 | 582 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x", |
22f99347 | 583 | q->first_to_check); |
779e6e1c | 584 | return 1; |
9a2c160a | 585 | } else |
60b5df2f | 586 | return 0; |
60b5df2f JG |
587 | } |
588 | ||
589 | static void qdio_kick_handler(struct qdio_q *q) | |
779e6e1c | 590 | { |
9c8a08d7 JG |
591 | int start = q->first_to_kick; |
592 | int end = q->first_to_check; | |
593 | int count; | |
779e6e1c JG |
594 | |
595 | if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) | |
596 | return; | |
597 | ||
9c8a08d7 JG |
598 | count = sub_buf(end, start); |
599 | ||
600 | if (q->is_input_q) { | |
6486cda6 | 601 | qperf_inc(q, inbound_handler); |
1d7e1500 | 602 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count); |
bd6e8a16 | 603 | } else { |
6486cda6 | 604 | qperf_inc(q, outbound_handler); |
1d7e1500 JG |
605 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x", |
606 | start, count); | |
bd6e8a16 | 607 | } |
9c8a08d7 JG |
608 | |
609 | q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count, | |
610 | q->irq_ptr->int_parm); | |
779e6e1c JG |
611 | |
612 | /* for the next time */ | |
9c8a08d7 | 613 | q->first_to_kick = end; |
779e6e1c JG |
614 | q->qdio_error = 0; |
615 | } | |
616 | ||
617 | static void __qdio_inbound_processing(struct qdio_q *q) | |
618 | { | |
6486cda6 | 619 | qperf_inc(q, tasklet_inbound); |
f3eb20fa | 620 | |
779e6e1c JG |
621 | if (!qdio_inbound_q_moved(q)) |
622 | return; | |
623 | ||
9c8a08d7 | 624 | qdio_kick_handler(q); |
779e6e1c | 625 | |
6486cda6 | 626 | if (!qdio_inbound_q_done(q)) { |
779e6e1c | 627 | /* means poll time is not yet over */ |
6486cda6 | 628 | qperf_inc(q, tasklet_inbound_resched); |
f3eb20fa JG |
629 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) { |
630 | tasklet_schedule(&q->tasklet); | |
631 | return; | |
632 | } | |
6486cda6 | 633 | } |
779e6e1c JG |
634 | |
635 | qdio_stop_polling(q); | |
636 | /* | |
637 | * We need to check again to not lose initiative after | |
638 | * resetting the ACK state. | |
639 | */ | |
6486cda6 JG |
640 | if (!qdio_inbound_q_done(q)) { |
641 | qperf_inc(q, tasklet_inbound_resched2); | |
f3eb20fa JG |
642 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) |
643 | tasklet_schedule(&q->tasklet); | |
6486cda6 | 644 | } |
779e6e1c JG |
645 | } |
646 | ||
779e6e1c JG |
647 | void qdio_inbound_processing(unsigned long data) |
648 | { | |
649 | struct qdio_q *q = (struct qdio_q *)data; | |
650 | __qdio_inbound_processing(q); | |
651 | } | |
652 | ||
653 | static int get_outbound_buffer_frontier(struct qdio_q *q) | |
654 | { | |
655 | int count, stop; | |
656 | unsigned char state; | |
657 | ||
658 | if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) || | |
659 | (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q))) | |
660 | qdio_siga_sync_q(q); | |
661 | ||
662 | /* | |
663 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved | |
664 | * would return 0. | |
665 | */ | |
666 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); | |
667 | stop = add_buf(q->first_to_check, count); | |
668 | ||
779e6e1c JG |
669 | if (q->first_to_check == stop) |
670 | return q->first_to_check; | |
671 | ||
50f769df | 672 | count = get_buf_states(q, q->first_to_check, &state, count, 0); |
779e6e1c JG |
673 | if (!count) |
674 | return q->first_to_check; | |
675 | ||
676 | switch (state) { | |
677 | case SLSB_P_OUTPUT_EMPTY: | |
678 | /* the adapter got it */ | |
1d7e1500 | 679 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %02x", q->nr, count); |
779e6e1c JG |
680 | |
681 | atomic_sub(count, &q->nr_buf_used); | |
682 | q->first_to_check = add_buf(q->first_to_check, count); | |
d307297f JG |
683 | if (q->irq_ptr->perf_stat_enabled) |
684 | account_sbals(q, count); | |
36e3e721 | 685 | break; |
779e6e1c | 686 | case SLSB_P_OUTPUT_ERROR: |
50f769df | 687 | announce_buffer_error(q, count); |
779e6e1c JG |
688 | /* process the buffer, the upper layer will take care of it */ |
689 | q->first_to_check = add_buf(q->first_to_check, count); | |
690 | atomic_sub(count, &q->nr_buf_used); | |
d307297f JG |
691 | if (q->irq_ptr->perf_stat_enabled) |
692 | account_sbals_error(q, count); | |
779e6e1c JG |
693 | break; |
694 | case SLSB_CU_OUTPUT_PRIMED: | |
695 | /* the adapter has not fetched the output yet */ | |
d307297f JG |
696 | if (q->irq_ptr->perf_stat_enabled) |
697 | q->q_stats.nr_sbal_nop++; | |
22f99347 | 698 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr); |
779e6e1c JG |
699 | break; |
700 | case SLSB_P_OUTPUT_NOT_INIT: | |
701 | case SLSB_P_OUTPUT_HALTED: | |
702 | break; | |
703 | default: | |
704 | BUG(); | |
705 | } | |
706 | return q->first_to_check; | |
707 | } | |
708 | ||
709 | /* all buffers processed? */ | |
710 | static inline int qdio_outbound_q_done(struct qdio_q *q) | |
711 | { | |
712 | return atomic_read(&q->nr_buf_used) == 0; | |
713 | } | |
714 | ||
715 | static inline int qdio_outbound_q_moved(struct qdio_q *q) | |
716 | { | |
717 | int bufnr; | |
718 | ||
719 | bufnr = get_outbound_buffer_frontier(q); | |
720 | ||
e85dea0e JG |
721 | if ((bufnr != q->last_move) || q->qdio_error) { |
722 | q->last_move = bufnr; | |
22f99347 | 723 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr); |
779e6e1c JG |
724 | return 1; |
725 | } else | |
726 | return 0; | |
727 | } | |
728 | ||
d303b6fd | 729 | static int qdio_kick_outbound_q(struct qdio_q *q) |
779e6e1c | 730 | { |
7a0b4cbc JG |
731 | unsigned int busy_bit; |
732 | int cc; | |
779e6e1c JG |
733 | |
734 | if (!need_siga_out(q)) | |
d303b6fd | 735 | return 0; |
779e6e1c | 736 | |
7a0b4cbc | 737 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr); |
6486cda6 | 738 | qperf_inc(q, siga_write); |
7a0b4cbc JG |
739 | |
740 | cc = qdio_siga_output(q, &busy_bit); | |
741 | switch (cc) { | |
779e6e1c | 742 | case 0: |
779e6e1c | 743 | break; |
7a0b4cbc JG |
744 | case 2: |
745 | if (busy_bit) { | |
746 | DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr); | |
d303b6fd JG |
747 | cc |= QDIO_ERROR_SIGA_BUSY; |
748 | } else | |
749 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr); | |
7a0b4cbc JG |
750 | break; |
751 | case 1: | |
752 | case 3: | |
753 | DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc); | |
7a0b4cbc | 754 | break; |
779e6e1c | 755 | } |
d303b6fd | 756 | return cc; |
779e6e1c JG |
757 | } |
758 | ||
779e6e1c JG |
759 | static void __qdio_outbound_processing(struct qdio_q *q) |
760 | { | |
6486cda6 | 761 | qperf_inc(q, tasklet_outbound); |
779e6e1c JG |
762 | BUG_ON(atomic_read(&q->nr_buf_used) < 0); |
763 | ||
764 | if (qdio_outbound_q_moved(q)) | |
9c8a08d7 | 765 | qdio_kick_handler(q); |
779e6e1c | 766 | |
c38f9608 | 767 | if (queue_type(q) == QDIO_ZFCP_QFMT) |
779e6e1c | 768 | if (!pci_out_supported(q) && !qdio_outbound_q_done(q)) |
c38f9608 | 769 | goto sched; |
779e6e1c JG |
770 | |
771 | /* bail out for HiperSockets unicast queues */ | |
772 | if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q)) | |
773 | return; | |
774 | ||
4bcb3a37 | 775 | if ((queue_type(q) == QDIO_IQDIO_QFMT) && |
c38f9608 JG |
776 | (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL) |
777 | goto sched; | |
4bcb3a37 | 778 | |
779e6e1c JG |
779 | if (q->u.out.pci_out_enabled) |
780 | return; | |
781 | ||
782 | /* | |
783 | * Now we know that queue type is either qeth without pci enabled | |
784 | * or HiperSockets multicast. Make sure buffer switch from PRIMED to | |
785 | * EMPTY is noticed and outbound_handler is called after some time. | |
786 | */ | |
787 | if (qdio_outbound_q_done(q)) | |
788 | del_timer(&q->u.out.timer); | |
6486cda6 JG |
789 | else |
790 | if (!timer_pending(&q->u.out.timer)) | |
779e6e1c | 791 | mod_timer(&q->u.out.timer, jiffies + 10 * HZ); |
c38f9608 JG |
792 | return; |
793 | ||
794 | sched: | |
795 | if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) | |
796 | return; | |
797 | tasklet_schedule(&q->tasklet); | |
779e6e1c JG |
798 | } |
799 | ||
800 | /* outbound tasklet */ | |
801 | void qdio_outbound_processing(unsigned long data) | |
802 | { | |
803 | struct qdio_q *q = (struct qdio_q *)data; | |
804 | __qdio_outbound_processing(q); | |
805 | } | |
806 | ||
807 | void qdio_outbound_timer(unsigned long data) | |
808 | { | |
809 | struct qdio_q *q = (struct qdio_q *)data; | |
c38f9608 JG |
810 | |
811 | if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) | |
812 | return; | |
779e6e1c JG |
813 | tasklet_schedule(&q->tasklet); |
814 | } | |
815 | ||
60b5df2f | 816 | static inline void qdio_check_outbound_after_thinint(struct qdio_q *q) |
779e6e1c JG |
817 | { |
818 | struct qdio_q *out; | |
819 | int i; | |
820 | ||
821 | if (!pci_out_supported(q)) | |
822 | return; | |
823 | ||
824 | for_each_output_queue(q->irq_ptr, out, i) | |
825 | if (!qdio_outbound_q_done(out)) | |
826 | tasklet_schedule(&out->tasklet); | |
827 | } | |
828 | ||
60b5df2f JG |
829 | static void __tiqdio_inbound_processing(struct qdio_q *q) |
830 | { | |
6486cda6 | 831 | qperf_inc(q, tasklet_inbound); |
60b5df2f JG |
832 | qdio_sync_after_thinint(q); |
833 | ||
834 | /* | |
835 | * The interrupt could be caused by a PCI request. Check the | |
836 | * PCI capable outbound queues. | |
837 | */ | |
838 | qdio_check_outbound_after_thinint(q); | |
839 | ||
840 | if (!qdio_inbound_q_moved(q)) | |
841 | return; | |
842 | ||
843 | qdio_kick_handler(q); | |
844 | ||
9a2c160a | 845 | if (!qdio_inbound_q_done(q)) { |
6486cda6 | 846 | qperf_inc(q, tasklet_inbound_resched); |
e2910bcf | 847 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) { |
60b5df2f | 848 | tasklet_schedule(&q->tasklet); |
e2910bcf JG |
849 | return; |
850 | } | |
60b5df2f JG |
851 | } |
852 | ||
853 | qdio_stop_polling(q); | |
854 | /* | |
855 | * We need to check again to not lose initiative after | |
856 | * resetting the ACK state. | |
857 | */ | |
9a2c160a | 858 | if (!qdio_inbound_q_done(q)) { |
6486cda6 | 859 | qperf_inc(q, tasklet_inbound_resched2); |
60b5df2f JG |
860 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) |
861 | tasklet_schedule(&q->tasklet); | |
862 | } | |
863 | } | |
864 | ||
865 | void tiqdio_inbound_processing(unsigned long data) | |
866 | { | |
867 | struct qdio_q *q = (struct qdio_q *)data; | |
868 | __tiqdio_inbound_processing(q); | |
869 | } | |
870 | ||
779e6e1c JG |
871 | static inline void qdio_set_state(struct qdio_irq *irq_ptr, |
872 | enum qdio_irq_states state) | |
873 | { | |
22f99347 | 874 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state); |
779e6e1c JG |
875 | |
876 | irq_ptr->state = state; | |
877 | mb(); | |
878 | } | |
879 | ||
22f99347 | 880 | static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb) |
779e6e1c | 881 | { |
779e6e1c | 882 | if (irb->esw.esw0.erw.cons) { |
22f99347 JG |
883 | DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no); |
884 | DBF_ERROR_HEX(irb, 64); | |
885 | DBF_ERROR_HEX(irb->ecw, 64); | |
779e6e1c JG |
886 | } |
887 | } | |
888 | ||
889 | /* PCI interrupt handler */ | |
890 | static void qdio_int_handler_pci(struct qdio_irq *irq_ptr) | |
891 | { | |
892 | int i; | |
893 | struct qdio_q *q; | |
894 | ||
c38f9608 JG |
895 | if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) |
896 | return; | |
897 | ||
d36deae7 JG |
898 | for_each_input_queue(irq_ptr, q, i) { |
899 | if (q->u.in.queue_start_poll) { | |
900 | /* skip if polling is enabled or already in work */ | |
901 | if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, | |
902 | &q->u.in.queue_irq_state)) { | |
903 | qperf_inc(q, int_discarded); | |
904 | continue; | |
905 | } | |
906 | q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr, | |
907 | q->irq_ptr->int_parm); | |
908 | } else | |
909 | tasklet_schedule(&q->tasklet); | |
910 | } | |
779e6e1c JG |
911 | |
912 | if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED)) | |
913 | return; | |
914 | ||
915 | for_each_output_queue(irq_ptr, q, i) { | |
916 | if (qdio_outbound_q_done(q)) | |
917 | continue; | |
918 | ||
919 | if (!siga_syncs_out_pci(q)) | |
920 | qdio_siga_sync_q(q); | |
921 | ||
922 | tasklet_schedule(&q->tasklet); | |
923 | } | |
924 | } | |
925 | ||
926 | static void qdio_handle_activate_check(struct ccw_device *cdev, | |
927 | unsigned long intparm, int cstat, int dstat) | |
928 | { | |
929 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
930 | struct qdio_q *q; | |
779e6e1c | 931 | |
22f99347 JG |
932 | DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no); |
933 | DBF_ERROR("intp :%lx", intparm); | |
934 | DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); | |
779e6e1c JG |
935 | |
936 | if (irq_ptr->nr_input_qs) { | |
937 | q = irq_ptr->input_qs[0]; | |
938 | } else if (irq_ptr->nr_output_qs) { | |
939 | q = irq_ptr->output_qs[0]; | |
940 | } else { | |
941 | dump_stack(); | |
942 | goto no_handler; | |
943 | } | |
944 | q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION, | |
945 | 0, -1, -1, irq_ptr->int_parm); | |
946 | no_handler: | |
947 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); | |
948 | } | |
949 | ||
4c575423 JG |
950 | static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat, |
951 | int dstat) | |
779e6e1c JG |
952 | { |
953 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
954 | ||
4c575423 | 955 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq"); |
779e6e1c | 956 | |
4c575423 | 957 | if (cstat) |
779e6e1c | 958 | goto error; |
4c575423 | 959 | if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END)) |
779e6e1c | 960 | goto error; |
4c575423 JG |
961 | if (!(dstat & DEV_STAT_DEV_END)) |
962 | goto error; | |
963 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED); | |
964 | return; | |
965 | ||
779e6e1c | 966 | error: |
22f99347 JG |
967 | DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no); |
968 | DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); | |
779e6e1c | 969 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); |
779e6e1c JG |
970 | } |
971 | ||
972 | /* qdio interrupt handler */ | |
973 | void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm, | |
974 | struct irb *irb) | |
975 | { | |
976 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
977 | int cstat, dstat; | |
779e6e1c | 978 | |
779e6e1c | 979 | if (!intparm || !irq_ptr) { |
22f99347 | 980 | DBF_ERROR("qint:%4x", cdev->private->schid.sch_no); |
779e6e1c JG |
981 | return; |
982 | } | |
983 | ||
30d77c3e | 984 | kstat_cpu(smp_processor_id()).irqs[IOINT_QDI]++; |
09a308f3 JG |
985 | if (irq_ptr->perf_stat_enabled) |
986 | irq_ptr->perf_stat.qdio_int++; | |
987 | ||
779e6e1c JG |
988 | if (IS_ERR(irb)) { |
989 | switch (PTR_ERR(irb)) { | |
990 | case -EIO: | |
22f99347 | 991 | DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no); |
75cb71f3 JG |
992 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); |
993 | wake_up(&cdev->private->wait_q); | |
779e6e1c JG |
994 | return; |
995 | default: | |
996 | WARN_ON(1); | |
997 | return; | |
998 | } | |
999 | } | |
22f99347 | 1000 | qdio_irq_check_sense(irq_ptr, irb); |
779e6e1c JG |
1001 | cstat = irb->scsw.cmd.cstat; |
1002 | dstat = irb->scsw.cmd.dstat; | |
1003 | ||
1004 | switch (irq_ptr->state) { | |
1005 | case QDIO_IRQ_STATE_INACTIVE: | |
1006 | qdio_establish_handle_irq(cdev, cstat, dstat); | |
1007 | break; | |
779e6e1c JG |
1008 | case QDIO_IRQ_STATE_CLEANUP: |
1009 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1010 | break; | |
779e6e1c JG |
1011 | case QDIO_IRQ_STATE_ESTABLISHED: |
1012 | case QDIO_IRQ_STATE_ACTIVE: | |
1013 | if (cstat & SCHN_STAT_PCI) { | |
1014 | qdio_int_handler_pci(irq_ptr); | |
779e6e1c JG |
1015 | return; |
1016 | } | |
4c575423 | 1017 | if (cstat || dstat) |
779e6e1c JG |
1018 | qdio_handle_activate_check(cdev, intparm, cstat, |
1019 | dstat); | |
4c575423 | 1020 | break; |
959153d3 JG |
1021 | case QDIO_IRQ_STATE_STOPPED: |
1022 | break; | |
779e6e1c JG |
1023 | default: |
1024 | WARN_ON(1); | |
1025 | } | |
1026 | wake_up(&cdev->private->wait_q); | |
1027 | } | |
1028 | ||
1029 | /** | |
1030 | * qdio_get_ssqd_desc - get qdio subchannel description | |
1031 | * @cdev: ccw device to get description for | |
bbd50e17 | 1032 | * @data: where to store the ssqd |
779e6e1c | 1033 | * |
bbd50e17 JG |
1034 | * Returns 0 or an error code. The results of the chsc are stored in the |
1035 | * specified structure. | |
779e6e1c | 1036 | */ |
bbd50e17 JG |
1037 | int qdio_get_ssqd_desc(struct ccw_device *cdev, |
1038 | struct qdio_ssqd_desc *data) | |
779e6e1c | 1039 | { |
779e6e1c | 1040 | |
bbd50e17 JG |
1041 | if (!cdev || !cdev->private) |
1042 | return -EINVAL; | |
1043 | ||
22f99347 | 1044 | DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no); |
bbd50e17 | 1045 | return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data); |
779e6e1c JG |
1046 | } |
1047 | EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc); | |
1048 | ||
779e6e1c JG |
1049 | static void qdio_shutdown_queues(struct ccw_device *cdev) |
1050 | { | |
1051 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1052 | struct qdio_q *q; | |
1053 | int i; | |
1054 | ||
1055 | for_each_input_queue(irq_ptr, q, i) | |
c38f9608 | 1056 | tasklet_kill(&q->tasklet); |
779e6e1c JG |
1057 | |
1058 | for_each_output_queue(irq_ptr, q, i) { | |
779e6e1c | 1059 | del_timer(&q->u.out.timer); |
c38f9608 | 1060 | tasklet_kill(&q->tasklet); |
779e6e1c JG |
1061 | } |
1062 | } | |
1063 | ||
1064 | /** | |
1065 | * qdio_shutdown - shut down a qdio subchannel | |
1066 | * @cdev: associated ccw device | |
1067 | * @how: use halt or clear to shutdown | |
1068 | */ | |
1069 | int qdio_shutdown(struct ccw_device *cdev, int how) | |
1070 | { | |
22f99347 | 1071 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
779e6e1c JG |
1072 | int rc; |
1073 | unsigned long flags; | |
779e6e1c | 1074 | |
779e6e1c JG |
1075 | if (!irq_ptr) |
1076 | return -ENODEV; | |
1077 | ||
b4547402 | 1078 | BUG_ON(irqs_disabled()); |
22f99347 JG |
1079 | DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no); |
1080 | ||
779e6e1c JG |
1081 | mutex_lock(&irq_ptr->setup_mutex); |
1082 | /* | |
1083 | * Subchannel was already shot down. We cannot prevent being called | |
1084 | * twice since cio may trigger a shutdown asynchronously. | |
1085 | */ | |
1086 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { | |
1087 | mutex_unlock(&irq_ptr->setup_mutex); | |
1088 | return 0; | |
1089 | } | |
1090 | ||
c38f9608 JG |
1091 | /* |
1092 | * Indicate that the device is going down. Scheduling the queue | |
1093 | * tasklets is forbidden from here on. | |
1094 | */ | |
1095 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); | |
1096 | ||
779e6e1c JG |
1097 | tiqdio_remove_input_queues(irq_ptr); |
1098 | qdio_shutdown_queues(cdev); | |
1099 | qdio_shutdown_debug_entries(irq_ptr, cdev); | |
1100 | ||
1101 | /* cleanup subchannel */ | |
1102 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1103 | ||
1104 | if (how & QDIO_FLAG_CLEANUP_USING_CLEAR) | |
1105 | rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP); | |
1106 | else | |
1107 | /* default behaviour is halt */ | |
1108 | rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP); | |
1109 | if (rc) { | |
22f99347 JG |
1110 | DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no); |
1111 | DBF_ERROR("rc:%4d", rc); | |
779e6e1c JG |
1112 | goto no_cleanup; |
1113 | } | |
1114 | ||
1115 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP); | |
1116 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1117 | wait_event_interruptible_timeout(cdev->private->wait_q, | |
1118 | irq_ptr->state == QDIO_IRQ_STATE_INACTIVE || | |
1119 | irq_ptr->state == QDIO_IRQ_STATE_ERR, | |
1120 | 10 * HZ); | |
1121 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1122 | ||
1123 | no_cleanup: | |
1124 | qdio_shutdown_thinint(irq_ptr); | |
1125 | ||
1126 | /* restore interrupt handler */ | |
1127 | if ((void *)cdev->handler == (void *)qdio_int_handler) | |
1128 | cdev->handler = irq_ptr->orig_handler; | |
1129 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1130 | ||
1131 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1132 | mutex_unlock(&irq_ptr->setup_mutex); | |
779e6e1c JG |
1133 | if (rc) |
1134 | return rc; | |
1135 | return 0; | |
1136 | } | |
1137 | EXPORT_SYMBOL_GPL(qdio_shutdown); | |
1138 | ||
1139 | /** | |
1140 | * qdio_free - free data structures for a qdio subchannel | |
1141 | * @cdev: associated ccw device | |
1142 | */ | |
1143 | int qdio_free(struct ccw_device *cdev) | |
1144 | { | |
22f99347 | 1145 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
58eb27cd | 1146 | |
779e6e1c JG |
1147 | if (!irq_ptr) |
1148 | return -ENODEV; | |
1149 | ||
22f99347 | 1150 | DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no); |
779e6e1c | 1151 | mutex_lock(&irq_ptr->setup_mutex); |
22f99347 JG |
1152 | |
1153 | if (irq_ptr->debug_area != NULL) { | |
1154 | debug_unregister(irq_ptr->debug_area); | |
1155 | irq_ptr->debug_area = NULL; | |
1156 | } | |
779e6e1c JG |
1157 | cdev->private->qdio_data = NULL; |
1158 | mutex_unlock(&irq_ptr->setup_mutex); | |
1159 | ||
1160 | qdio_release_memory(irq_ptr); | |
1161 | return 0; | |
1162 | } | |
1163 | EXPORT_SYMBOL_GPL(qdio_free); | |
1164 | ||
779e6e1c JG |
1165 | /** |
1166 | * qdio_allocate - allocate qdio queues and associated data | |
1167 | * @init_data: initialization data | |
1168 | */ | |
1169 | int qdio_allocate(struct qdio_initialize *init_data) | |
1170 | { | |
1171 | struct qdio_irq *irq_ptr; | |
779e6e1c | 1172 | |
22f99347 | 1173 | DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no); |
779e6e1c JG |
1174 | |
1175 | if ((init_data->no_input_qs && !init_data->input_handler) || | |
1176 | (init_data->no_output_qs && !init_data->output_handler)) | |
1177 | return -EINVAL; | |
1178 | ||
1179 | if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) || | |
1180 | (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)) | |
1181 | return -EINVAL; | |
1182 | ||
1183 | if ((!init_data->input_sbal_addr_array) || | |
1184 | (!init_data->output_sbal_addr_array)) | |
1185 | return -EINVAL; | |
1186 | ||
779e6e1c JG |
1187 | /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */ |
1188 | irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
1189 | if (!irq_ptr) | |
1190 | goto out_err; | |
779e6e1c JG |
1191 | |
1192 | mutex_init(&irq_ptr->setup_mutex); | |
22f99347 | 1193 | qdio_allocate_dbf(init_data, irq_ptr); |
779e6e1c JG |
1194 | |
1195 | /* | |
1196 | * Allocate a page for the chsc calls in qdio_establish. | |
1197 | * Must be pre-allocated since a zfcp recovery will call | |
1198 | * qdio_establish. In case of low memory and swap on a zfcp disk | |
1199 | * we may not be able to allocate memory otherwise. | |
1200 | */ | |
1201 | irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL); | |
1202 | if (!irq_ptr->chsc_page) | |
1203 | goto out_rel; | |
1204 | ||
1205 | /* qdr is used in ccw1.cda which is u32 */ | |
3b8e3004 | 1206 | irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
779e6e1c JG |
1207 | if (!irq_ptr->qdr) |
1208 | goto out_rel; | |
1209 | WARN_ON((unsigned long)irq_ptr->qdr & 0xfff); | |
1210 | ||
779e6e1c JG |
1211 | if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs, |
1212 | init_data->no_output_qs)) | |
1213 | goto out_rel; | |
1214 | ||
1215 | init_data->cdev->private->qdio_data = irq_ptr; | |
1216 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1217 | return 0; | |
1218 | out_rel: | |
1219 | qdio_release_memory(irq_ptr); | |
1220 | out_err: | |
1221 | return -ENOMEM; | |
1222 | } | |
1223 | EXPORT_SYMBOL_GPL(qdio_allocate); | |
1224 | ||
1225 | /** | |
1226 | * qdio_establish - establish queues on a qdio subchannel | |
1227 | * @init_data: initialization data | |
1228 | */ | |
1229 | int qdio_establish(struct qdio_initialize *init_data) | |
1230 | { | |
779e6e1c JG |
1231 | struct qdio_irq *irq_ptr; |
1232 | struct ccw_device *cdev = init_data->cdev; | |
1233 | unsigned long saveflags; | |
1234 | int rc; | |
1235 | ||
22f99347 | 1236 | DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no); |
58eb27cd | 1237 | |
779e6e1c JG |
1238 | irq_ptr = cdev->private->qdio_data; |
1239 | if (!irq_ptr) | |
1240 | return -ENODEV; | |
1241 | ||
1242 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1243 | return -EINVAL; | |
1244 | ||
779e6e1c JG |
1245 | mutex_lock(&irq_ptr->setup_mutex); |
1246 | qdio_setup_irq(init_data); | |
1247 | ||
1248 | rc = qdio_establish_thinint(irq_ptr); | |
1249 | if (rc) { | |
1250 | mutex_unlock(&irq_ptr->setup_mutex); | |
1251 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1252 | return rc; | |
1253 | } | |
1254 | ||
1255 | /* establish q */ | |
1256 | irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd; | |
1257 | irq_ptr->ccw.flags = CCW_FLAG_SLI; | |
1258 | irq_ptr->ccw.count = irq_ptr->equeue.count; | |
1259 | irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr); | |
1260 | ||
1261 | spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); | |
1262 | ccw_device_set_options_mask(cdev, 0); | |
1263 | ||
1264 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0); | |
1265 | if (rc) { | |
22f99347 JG |
1266 | DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no); |
1267 | DBF_ERROR("rc:%4x", rc); | |
779e6e1c JG |
1268 | } |
1269 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); | |
1270 | ||
1271 | if (rc) { | |
1272 | mutex_unlock(&irq_ptr->setup_mutex); | |
1273 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1274 | return rc; | |
1275 | } | |
1276 | ||
1277 | wait_event_interruptible_timeout(cdev->private->wait_q, | |
1278 | irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED || | |
1279 | irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ); | |
1280 | ||
1281 | if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) { | |
1282 | mutex_unlock(&irq_ptr->setup_mutex); | |
1283 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1284 | return -EIO; | |
1285 | } | |
1286 | ||
1287 | qdio_setup_ssqd_info(irq_ptr); | |
22f99347 | 1288 | DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac); |
779e6e1c JG |
1289 | |
1290 | /* qebsm is now setup if available, initialize buffer states */ | |
1291 | qdio_init_buf_states(irq_ptr); | |
1292 | ||
1293 | mutex_unlock(&irq_ptr->setup_mutex); | |
1294 | qdio_print_subchannel_info(irq_ptr, cdev); | |
1295 | qdio_setup_debug_entries(irq_ptr, cdev); | |
1296 | return 0; | |
1297 | } | |
1298 | EXPORT_SYMBOL_GPL(qdio_establish); | |
1299 | ||
1300 | /** | |
1301 | * qdio_activate - activate queues on a qdio subchannel | |
1302 | * @cdev: associated cdev | |
1303 | */ | |
1304 | int qdio_activate(struct ccw_device *cdev) | |
1305 | { | |
1306 | struct qdio_irq *irq_ptr; | |
1307 | int rc; | |
1308 | unsigned long saveflags; | |
779e6e1c | 1309 | |
22f99347 | 1310 | DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no); |
58eb27cd | 1311 | |
779e6e1c JG |
1312 | irq_ptr = cdev->private->qdio_data; |
1313 | if (!irq_ptr) | |
1314 | return -ENODEV; | |
1315 | ||
1316 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1317 | return -EINVAL; | |
1318 | ||
1319 | mutex_lock(&irq_ptr->setup_mutex); | |
1320 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { | |
1321 | rc = -EBUSY; | |
1322 | goto out; | |
1323 | } | |
1324 | ||
779e6e1c JG |
1325 | irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd; |
1326 | irq_ptr->ccw.flags = CCW_FLAG_SLI; | |
1327 | irq_ptr->ccw.count = irq_ptr->aqueue.count; | |
1328 | irq_ptr->ccw.cda = 0; | |
1329 | ||
1330 | spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); | |
1331 | ccw_device_set_options(cdev, CCWDEV_REPORT_ALL); | |
1332 | ||
1333 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE, | |
1334 | 0, DOIO_DENY_PREFETCH); | |
1335 | if (rc) { | |
22f99347 JG |
1336 | DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no); |
1337 | DBF_ERROR("rc:%4x", rc); | |
779e6e1c JG |
1338 | } |
1339 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); | |
1340 | ||
1341 | if (rc) | |
1342 | goto out; | |
1343 | ||
1344 | if (is_thinint_irq(irq_ptr)) | |
1345 | tiqdio_add_input_queues(irq_ptr); | |
1346 | ||
1347 | /* wait for subchannel to become active */ | |
1348 | msleep(5); | |
1349 | ||
1350 | switch (irq_ptr->state) { | |
1351 | case QDIO_IRQ_STATE_STOPPED: | |
1352 | case QDIO_IRQ_STATE_ERR: | |
e4c14e20 JG |
1353 | rc = -EIO; |
1354 | break; | |
779e6e1c JG |
1355 | default: |
1356 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE); | |
1357 | rc = 0; | |
1358 | } | |
1359 | out: | |
1360 | mutex_unlock(&irq_ptr->setup_mutex); | |
1361 | return rc; | |
1362 | } | |
1363 | EXPORT_SYMBOL_GPL(qdio_activate); | |
1364 | ||
1365 | static inline int buf_in_between(int bufnr, int start, int count) | |
1366 | { | |
1367 | int end = add_buf(start, count); | |
1368 | ||
1369 | if (end > start) { | |
1370 | if (bufnr >= start && bufnr < end) | |
1371 | return 1; | |
1372 | else | |
1373 | return 0; | |
1374 | } | |
1375 | ||
1376 | /* wrap-around case */ | |
1377 | if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) || | |
1378 | (bufnr < end)) | |
1379 | return 1; | |
1380 | else | |
1381 | return 0; | |
1382 | } | |
1383 | ||
1384 | /** | |
1385 | * handle_inbound - reset processed input buffers | |
1386 | * @q: queue containing the buffers | |
1387 | * @callflags: flags | |
1388 | * @bufnr: first buffer to process | |
1389 | * @count: how many buffers are emptied | |
1390 | */ | |
d303b6fd JG |
1391 | static int handle_inbound(struct qdio_q *q, unsigned int callflags, |
1392 | int bufnr, int count) | |
779e6e1c | 1393 | { |
d303b6fd | 1394 | int used, diff; |
779e6e1c | 1395 | |
6486cda6 JG |
1396 | qperf_inc(q, inbound_call); |
1397 | ||
50f769df JG |
1398 | if (!q->u.in.polling) |
1399 | goto set; | |
1400 | ||
1401 | /* protect against stop polling setting an ACK for an emptied slsb */ | |
1402 | if (count == QDIO_MAX_BUFFERS_PER_Q) { | |
1403 | /* overwriting everything, just delete polling status */ | |
1404 | q->u.in.polling = 0; | |
1405 | q->u.in.ack_count = 0; | |
1406 | goto set; | |
e85dea0e | 1407 | } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) { |
50f769df | 1408 | if (is_qebsm(q)) { |
e85dea0e | 1409 | /* partial overwrite, just update ack_start */ |
50f769df | 1410 | diff = add_buf(bufnr, count); |
e85dea0e | 1411 | diff = sub_buf(diff, q->u.in.ack_start); |
50f769df JG |
1412 | q->u.in.ack_count -= diff; |
1413 | if (q->u.in.ack_count <= 0) { | |
1414 | q->u.in.polling = 0; | |
1415 | q->u.in.ack_count = 0; | |
50f769df JG |
1416 | goto set; |
1417 | } | |
e85dea0e | 1418 | q->u.in.ack_start = add_buf(q->u.in.ack_start, diff); |
50f769df JG |
1419 | } |
1420 | else | |
1421 | /* the only ACK will be deleted, so stop polling */ | |
779e6e1c | 1422 | q->u.in.polling = 0; |
50f769df | 1423 | } |
779e6e1c | 1424 | |
50f769df | 1425 | set: |
779e6e1c | 1426 | count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count); |
779e6e1c JG |
1427 | |
1428 | used = atomic_add_return(count, &q->nr_buf_used) - count; | |
1429 | BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q); | |
1430 | ||
1431 | /* no need to signal as long as the adapter had free buffers */ | |
1432 | if (used) | |
d303b6fd | 1433 | return 0; |
779e6e1c | 1434 | |
d303b6fd JG |
1435 | if (need_siga_in(q)) |
1436 | return qdio_siga_input(q); | |
1437 | return 0; | |
779e6e1c JG |
1438 | } |
1439 | ||
1440 | /** | |
1441 | * handle_outbound - process filled outbound buffers | |
1442 | * @q: queue containing the buffers | |
1443 | * @callflags: flags | |
1444 | * @bufnr: first buffer to process | |
1445 | * @count: how many buffers are filled | |
1446 | */ | |
d303b6fd JG |
1447 | static int handle_outbound(struct qdio_q *q, unsigned int callflags, |
1448 | int bufnr, int count) | |
779e6e1c JG |
1449 | { |
1450 | unsigned char state; | |
d303b6fd | 1451 | int used, rc = 0; |
779e6e1c | 1452 | |
6486cda6 | 1453 | qperf_inc(q, outbound_call); |
779e6e1c JG |
1454 | |
1455 | count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count); | |
1456 | used = atomic_add_return(count, &q->nr_buf_used); | |
1457 | BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q); | |
1458 | ||
0195843b JG |
1459 | if (used == QDIO_MAX_BUFFERS_PER_Q) |
1460 | qperf_inc(q, outbound_queue_full); | |
1461 | ||
6486cda6 | 1462 | if (callflags & QDIO_FLAG_PCI_OUT) { |
779e6e1c | 1463 | q->u.out.pci_out_enabled = 1; |
6486cda6 | 1464 | qperf_inc(q, pci_request_int); |
110da317 | 1465 | } else |
779e6e1c JG |
1466 | q->u.out.pci_out_enabled = 0; |
1467 | ||
1468 | if (queue_type(q) == QDIO_IQDIO_QFMT) { | |
110da317 JG |
1469 | /* One SIGA-W per buffer required for unicast HiperSockets. */ |
1470 | WARN_ON_ONCE(count > 1 && !multicast_outbound(q)); | |
1471 | ||
1472 | rc = qdio_kick_outbound_q(q); | |
1473 | } else if (unlikely(need_siga_sync(q))) { | |
1474 | rc = qdio_siga_sync_q(q); | |
1475 | } else { | |
1476 | /* try to fast requeue buffers */ | |
1477 | get_buf_state(q, prev_buf(bufnr), &state, 0); | |
1478 | if (state != SLSB_CU_OUTPUT_PRIMED) | |
d303b6fd | 1479 | rc = qdio_kick_outbound_q(q); |
779e6e1c | 1480 | else |
110da317 | 1481 | qperf_inc(q, fast_requeue); |
779e6e1c JG |
1482 | } |
1483 | ||
3d6c76ff JG |
1484 | /* in case of SIGA errors we must process the error immediately */ |
1485 | if (used >= q->u.out.scan_threshold || rc) | |
1486 | tasklet_schedule(&q->tasklet); | |
1487 | else | |
1488 | /* free the SBALs in case of no further traffic */ | |
1489 | if (!timer_pending(&q->u.out.timer)) | |
1490 | mod_timer(&q->u.out.timer, jiffies + HZ); | |
d303b6fd | 1491 | return rc; |
779e6e1c JG |
1492 | } |
1493 | ||
1494 | /** | |
1495 | * do_QDIO - process input or output buffers | |
1496 | * @cdev: associated ccw_device for the qdio subchannel | |
1497 | * @callflags: input or output and special flags from the program | |
1498 | * @q_nr: queue number | |
1499 | * @bufnr: buffer number | |
1500 | * @count: how many buffers to process | |
1501 | */ | |
1502 | int do_QDIO(struct ccw_device *cdev, unsigned int callflags, | |
6618241b | 1503 | int q_nr, unsigned int bufnr, unsigned int count) |
779e6e1c JG |
1504 | { |
1505 | struct qdio_irq *irq_ptr; | |
779e6e1c | 1506 | |
6618241b | 1507 | if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q) |
779e6e1c JG |
1508 | return -EINVAL; |
1509 | ||
779e6e1c JG |
1510 | irq_ptr = cdev->private->qdio_data; |
1511 | if (!irq_ptr) | |
1512 | return -ENODEV; | |
1513 | ||
1d7e1500 JG |
1514 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, |
1515 | "do%02x b:%02x c:%02x", callflags, bufnr, count); | |
779e6e1c JG |
1516 | |
1517 | if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE) | |
1518 | return -EBUSY; | |
1519 | ||
1520 | if (callflags & QDIO_FLAG_SYNC_INPUT) | |
d303b6fd JG |
1521 | return handle_inbound(irq_ptr->input_qs[q_nr], |
1522 | callflags, bufnr, count); | |
779e6e1c | 1523 | else if (callflags & QDIO_FLAG_SYNC_OUTPUT) |
d303b6fd JG |
1524 | return handle_outbound(irq_ptr->output_qs[q_nr], |
1525 | callflags, bufnr, count); | |
1526 | return -EINVAL; | |
779e6e1c JG |
1527 | } |
1528 | EXPORT_SYMBOL_GPL(do_QDIO); | |
1529 | ||
d36deae7 JG |
1530 | /** |
1531 | * qdio_start_irq - process input buffers | |
1532 | * @cdev: associated ccw_device for the qdio subchannel | |
1533 | * @nr: input queue number | |
1534 | * | |
1535 | * Return codes | |
1536 | * 0 - success | |
1537 | * 1 - irqs not started since new data is available | |
1538 | */ | |
1539 | int qdio_start_irq(struct ccw_device *cdev, int nr) | |
1540 | { | |
1541 | struct qdio_q *q; | |
1542 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1543 | ||
1544 | if (!irq_ptr) | |
1545 | return -ENODEV; | |
1546 | q = irq_ptr->input_qs[nr]; | |
1547 | ||
1548 | WARN_ON(queue_irqs_enabled(q)); | |
1549 | ||
4f325184 | 1550 | if (!shared_ind(q->irq_ptr->dsci)) |
d36deae7 JG |
1551 | xchg(q->irq_ptr->dsci, 0); |
1552 | ||
1553 | qdio_stop_polling(q); | |
1554 | clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state); | |
1555 | ||
1556 | /* | |
1557 | * We need to check again to not lose initiative after | |
1558 | * resetting the ACK state. | |
1559 | */ | |
4f325184 | 1560 | if (!shared_ind(q->irq_ptr->dsci) && *q->irq_ptr->dsci) |
d36deae7 JG |
1561 | goto rescan; |
1562 | if (!qdio_inbound_q_done(q)) | |
1563 | goto rescan; | |
1564 | return 0; | |
1565 | ||
1566 | rescan: | |
1567 | if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, | |
1568 | &q->u.in.queue_irq_state)) | |
1569 | return 0; | |
1570 | else | |
1571 | return 1; | |
1572 | ||
1573 | } | |
1574 | EXPORT_SYMBOL(qdio_start_irq); | |
1575 | ||
1576 | /** | |
1577 | * qdio_get_next_buffers - process input buffers | |
1578 | * @cdev: associated ccw_device for the qdio subchannel | |
1579 | * @nr: input queue number | |
1580 | * @bufnr: first filled buffer number | |
1581 | * @error: buffers are in error state | |
1582 | * | |
1583 | * Return codes | |
1584 | * < 0 - error | |
1585 | * = 0 - no new buffers found | |
1586 | * > 0 - number of processed buffers | |
1587 | */ | |
1588 | int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr, | |
1589 | int *error) | |
1590 | { | |
1591 | struct qdio_q *q; | |
1592 | int start, end; | |
1593 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1594 | ||
1595 | if (!irq_ptr) | |
1596 | return -ENODEV; | |
1597 | q = irq_ptr->input_qs[nr]; | |
1598 | WARN_ON(queue_irqs_enabled(q)); | |
1599 | ||
1600 | qdio_sync_after_thinint(q); | |
1601 | ||
1602 | /* | |
1603 | * The interrupt could be caused by a PCI request. Check the | |
1604 | * PCI capable outbound queues. | |
1605 | */ | |
1606 | qdio_check_outbound_after_thinint(q); | |
1607 | ||
1608 | if (!qdio_inbound_q_moved(q)) | |
1609 | return 0; | |
1610 | ||
1611 | /* Note: upper-layer MUST stop processing immediately here ... */ | |
1612 | if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) | |
1613 | return -EIO; | |
1614 | ||
1615 | start = q->first_to_kick; | |
1616 | end = q->first_to_check; | |
1617 | *bufnr = start; | |
1618 | *error = q->qdio_error; | |
1619 | ||
1620 | /* for the next time */ | |
1621 | q->first_to_kick = end; | |
1622 | q->qdio_error = 0; | |
1623 | return sub_buf(end, start); | |
1624 | } | |
1625 | EXPORT_SYMBOL(qdio_get_next_buffers); | |
1626 | ||
1627 | /** | |
1628 | * qdio_stop_irq - disable interrupt processing for the device | |
1629 | * @cdev: associated ccw_device for the qdio subchannel | |
1630 | * @nr: input queue number | |
1631 | * | |
1632 | * Return codes | |
1633 | * 0 - interrupts were already disabled | |
1634 | * 1 - interrupts successfully disabled | |
1635 | */ | |
1636 | int qdio_stop_irq(struct ccw_device *cdev, int nr) | |
1637 | { | |
1638 | struct qdio_q *q; | |
1639 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1640 | ||
1641 | if (!irq_ptr) | |
1642 | return -ENODEV; | |
1643 | q = irq_ptr->input_qs[nr]; | |
1644 | ||
1645 | if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, | |
1646 | &q->u.in.queue_irq_state)) | |
1647 | return 0; | |
1648 | else | |
1649 | return 1; | |
1650 | } | |
1651 | EXPORT_SYMBOL(qdio_stop_irq); | |
1652 | ||
779e6e1c JG |
1653 | static int __init init_QDIO(void) |
1654 | { | |
1655 | int rc; | |
1656 | ||
1657 | rc = qdio_setup_init(); | |
1658 | if (rc) | |
1659 | return rc; | |
1660 | rc = tiqdio_allocate_memory(); | |
1661 | if (rc) | |
1662 | goto out_cache; | |
1663 | rc = qdio_debug_init(); | |
1664 | if (rc) | |
1665 | goto out_ti; | |
779e6e1c JG |
1666 | rc = tiqdio_register_thinints(); |
1667 | if (rc) | |
6486cda6 | 1668 | goto out_debug; |
779e6e1c JG |
1669 | return 0; |
1670 | ||
779e6e1c JG |
1671 | out_debug: |
1672 | qdio_debug_exit(); | |
1673 | out_ti: | |
1674 | tiqdio_free_memory(); | |
1675 | out_cache: | |
1676 | qdio_setup_exit(); | |
1677 | return rc; | |
1678 | } | |
1679 | ||
1680 | static void __exit exit_QDIO(void) | |
1681 | { | |
1682 | tiqdio_unregister_thinints(); | |
1683 | tiqdio_free_memory(); | |
779e6e1c JG |
1684 | qdio_debug_exit(); |
1685 | qdio_setup_exit(); | |
1686 | } | |
1687 | ||
1688 | module_init(init_QDIO); | |
1689 | module_exit(exit_QDIO); |