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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 | ||
33 | static inline int do_siga_sync(struct subchannel_id schid, | |
34 | unsigned int out_mask, unsigned int in_mask) | |
35 | { | |
36 | register unsigned long __fc asm ("0") = 2; | |
37 | register struct subchannel_id __schid asm ("1") = schid; | |
38 | register unsigned long out asm ("2") = out_mask; | |
39 | register unsigned long in asm ("3") = in_mask; | |
40 | int cc; | |
41 | ||
42 | asm volatile( | |
43 | " siga 0\n" | |
44 | " ipm %0\n" | |
45 | " srl %0,28\n" | |
46 | : "=d" (cc) | |
47 | : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc"); | |
48 | return cc; | |
49 | } | |
50 | ||
51 | static inline int do_siga_input(struct subchannel_id schid, unsigned int mask) | |
52 | { | |
53 | register unsigned long __fc asm ("0") = 1; | |
54 | register struct subchannel_id __schid asm ("1") = schid; | |
55 | register unsigned long __mask asm ("2") = mask; | |
56 | int cc; | |
57 | ||
58 | asm volatile( | |
59 | " siga 0\n" | |
60 | " ipm %0\n" | |
61 | " srl %0,28\n" | |
62 | : "=d" (cc) | |
63 | : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory"); | |
64 | return cc; | |
65 | } | |
66 | ||
67 | /** | |
68 | * do_siga_output - perform SIGA-w/wt function | |
69 | * @schid: subchannel id or in case of QEBSM the subchannel token | |
70 | * @mask: which output queues to process | |
71 | * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer | |
72 | * @fc: function code to perform | |
73 | * | |
74 | * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION. | |
75 | * Note: For IQDC unicast queues only the highest priority queue is processed. | |
76 | */ | |
77 | static inline int do_siga_output(unsigned long schid, unsigned long mask, | |
7a0b4cbc | 78 | unsigned int *bb, unsigned int fc) |
779e6e1c JG |
79 | { |
80 | register unsigned long __fc asm("0") = fc; | |
81 | register unsigned long __schid asm("1") = schid; | |
82 | register unsigned long __mask asm("2") = mask; | |
83 | int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION; | |
84 | ||
85 | asm volatile( | |
86 | " siga 0\n" | |
87 | "0: ipm %0\n" | |
88 | " srl %0,28\n" | |
89 | "1:\n" | |
90 | EX_TABLE(0b, 1b) | |
91 | : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask) | |
92 | : : "cc", "memory"); | |
93 | *bb = ((unsigned int) __fc) >> 31; | |
94 | return cc; | |
95 | } | |
96 | ||
97 | static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq) | |
98 | { | |
779e6e1c JG |
99 | /* all done or next buffer state different */ |
100 | if (ccq == 0 || ccq == 32) | |
101 | return 0; | |
102 | /* not all buffers processed */ | |
103 | if (ccq == 96 || ccq == 97) | |
104 | return 1; | |
105 | /* notify devices immediately */ | |
22f99347 | 106 | DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq); |
779e6e1c JG |
107 | return -EIO; |
108 | } | |
109 | ||
110 | /** | |
111 | * qdio_do_eqbs - extract buffer states for QEBSM | |
112 | * @q: queue to manipulate | |
113 | * @state: state of the extracted buffers | |
114 | * @start: buffer number to start at | |
115 | * @count: count of buffers to examine | |
50f769df | 116 | * @auto_ack: automatically acknowledge buffers |
779e6e1c | 117 | * |
73ac36ea | 118 | * Returns the number of successfully extracted equal buffer states. |
779e6e1c JG |
119 | * Stops processing if a state is different from the last buffers state. |
120 | */ | |
121 | static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state, | |
50f769df | 122 | int start, int count, int auto_ack) |
779e6e1c JG |
123 | { |
124 | unsigned int ccq = 0; | |
125 | int tmp_count = count, tmp_start = start; | |
126 | int nr = q->nr; | |
127 | int rc; | |
779e6e1c JG |
128 | |
129 | BUG_ON(!q->irq_ptr->sch_token); | |
6486cda6 | 130 | qperf_inc(q, eqbs); |
779e6e1c JG |
131 | |
132 | if (!q->is_input_q) | |
133 | nr += q->irq_ptr->nr_input_qs; | |
134 | again: | |
50f769df JG |
135 | ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count, |
136 | auto_ack); | |
779e6e1c JG |
137 | rc = qdio_check_ccq(q, ccq); |
138 | ||
139 | /* At least one buffer was processed, return and extract the remaining | |
140 | * buffers later. | |
141 | */ | |
23589d05 | 142 | if ((ccq == 96) && (count != tmp_count)) { |
6486cda6 | 143 | qperf_inc(q, eqbs_partial); |
779e6e1c | 144 | return (count - tmp_count); |
23589d05 | 145 | } |
22f99347 | 146 | |
779e6e1c | 147 | if (rc == 1) { |
22f99347 | 148 | DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq); |
779e6e1c JG |
149 | goto again; |
150 | } | |
151 | ||
152 | if (rc < 0) { | |
22f99347 JG |
153 | DBF_ERROR("%4x EQBS ERROR", SCH_NO(q)); |
154 | DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); | |
779e6e1c JG |
155 | q->handler(q->irq_ptr->cdev, |
156 | QDIO_ERROR_ACTIVATE_CHECK_CONDITION, | |
157 | 0, -1, -1, q->irq_ptr->int_parm); | |
158 | return 0; | |
159 | } | |
160 | return count - tmp_count; | |
161 | } | |
162 | ||
163 | /** | |
164 | * qdio_do_sqbs - set buffer states for QEBSM | |
165 | * @q: queue to manipulate | |
166 | * @state: new state of the buffers | |
167 | * @start: first buffer number to change | |
168 | * @count: how many buffers to change | |
169 | * | |
170 | * Returns the number of successfully changed buffers. | |
171 | * Does retrying until the specified count of buffer states is set or an | |
172 | * error occurs. | |
173 | */ | |
174 | static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start, | |
175 | int count) | |
176 | { | |
177 | unsigned int ccq = 0; | |
178 | int tmp_count = count, tmp_start = start; | |
179 | int nr = q->nr; | |
180 | int rc; | |
779e6e1c | 181 | |
50f769df JG |
182 | if (!count) |
183 | return 0; | |
184 | ||
779e6e1c | 185 | BUG_ON(!q->irq_ptr->sch_token); |
6486cda6 | 186 | qperf_inc(q, sqbs); |
779e6e1c JG |
187 | |
188 | if (!q->is_input_q) | |
189 | nr += q->irq_ptr->nr_input_qs; | |
190 | again: | |
191 | ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count); | |
192 | rc = qdio_check_ccq(q, ccq); | |
193 | if (rc == 1) { | |
22f99347 | 194 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq); |
6486cda6 | 195 | qperf_inc(q, sqbs_partial); |
779e6e1c JG |
196 | goto again; |
197 | } | |
198 | if (rc < 0) { | |
22f99347 JG |
199 | DBF_ERROR("%4x SQBS ERROR", SCH_NO(q)); |
200 | DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); | |
779e6e1c JG |
201 | q->handler(q->irq_ptr->cdev, |
202 | QDIO_ERROR_ACTIVATE_CHECK_CONDITION, | |
203 | 0, -1, -1, q->irq_ptr->int_parm); | |
204 | return 0; | |
205 | } | |
206 | WARN_ON(tmp_count); | |
207 | return count - tmp_count; | |
208 | } | |
209 | ||
210 | /* returns number of examined buffers and their common state in *state */ | |
211 | static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr, | |
50f769df JG |
212 | unsigned char *state, unsigned int count, |
213 | int auto_ack) | |
779e6e1c JG |
214 | { |
215 | unsigned char __state = 0; | |
216 | int i; | |
217 | ||
218 | BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK); | |
219 | BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q); | |
220 | ||
221 | if (is_qebsm(q)) | |
50f769df | 222 | return qdio_do_eqbs(q, state, bufnr, count, auto_ack); |
779e6e1c JG |
223 | |
224 | for (i = 0; i < count; i++) { | |
225 | if (!__state) | |
226 | __state = q->slsb.val[bufnr]; | |
227 | else if (q->slsb.val[bufnr] != __state) | |
228 | break; | |
229 | bufnr = next_buf(bufnr); | |
230 | } | |
231 | *state = __state; | |
232 | return i; | |
233 | } | |
234 | ||
60b5df2f JG |
235 | static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr, |
236 | unsigned char *state, int auto_ack) | |
779e6e1c | 237 | { |
50f769df | 238 | return get_buf_states(q, bufnr, state, 1, auto_ack); |
779e6e1c JG |
239 | } |
240 | ||
241 | /* wrap-around safe setting of slsb states, returns number of changed buffers */ | |
242 | static inline int set_buf_states(struct qdio_q *q, int bufnr, | |
243 | unsigned char state, int count) | |
244 | { | |
245 | int i; | |
246 | ||
247 | BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK); | |
248 | BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q); | |
249 | ||
250 | if (is_qebsm(q)) | |
251 | return qdio_do_sqbs(q, state, bufnr, count); | |
252 | ||
253 | for (i = 0; i < count; i++) { | |
254 | xchg(&q->slsb.val[bufnr], state); | |
255 | bufnr = next_buf(bufnr); | |
256 | } | |
257 | return count; | |
258 | } | |
259 | ||
260 | static inline int set_buf_state(struct qdio_q *q, int bufnr, | |
261 | unsigned char state) | |
262 | { | |
263 | return set_buf_states(q, bufnr, state, 1); | |
264 | } | |
265 | ||
266 | /* set slsb states to initial state */ | |
267 | void qdio_init_buf_states(struct qdio_irq *irq_ptr) | |
268 | { | |
269 | struct qdio_q *q; | |
270 | int i; | |
271 | ||
272 | for_each_input_queue(irq_ptr, q, i) | |
273 | set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT, | |
274 | QDIO_MAX_BUFFERS_PER_Q); | |
275 | for_each_output_queue(irq_ptr, q, i) | |
276 | set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT, | |
277 | QDIO_MAX_BUFFERS_PER_Q); | |
278 | } | |
279 | ||
60b5df2f | 280 | static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output, |
779e6e1c JG |
281 | unsigned int input) |
282 | { | |
283 | int cc; | |
284 | ||
285 | if (!need_siga_sync(q)) | |
286 | return 0; | |
287 | ||
7a0b4cbc | 288 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr); |
6486cda6 | 289 | qperf_inc(q, siga_sync); |
779e6e1c JG |
290 | |
291 | cc = do_siga_sync(q->irq_ptr->schid, output, input); | |
22f99347 JG |
292 | if (cc) |
293 | DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc); | |
779e6e1c JG |
294 | return cc; |
295 | } | |
296 | ||
60b5df2f | 297 | static inline int qdio_siga_sync_q(struct qdio_q *q) |
779e6e1c JG |
298 | { |
299 | if (q->is_input_q) | |
300 | return qdio_siga_sync(q, 0, q->mask); | |
301 | else | |
302 | return qdio_siga_sync(q, q->mask, 0); | |
303 | } | |
304 | ||
305 | static inline int qdio_siga_sync_out(struct qdio_q *q) | |
306 | { | |
307 | return qdio_siga_sync(q, ~0U, 0); | |
308 | } | |
309 | ||
310 | static inline int qdio_siga_sync_all(struct qdio_q *q) | |
311 | { | |
312 | return qdio_siga_sync(q, ~0U, ~0U); | |
313 | } | |
314 | ||
7a0b4cbc | 315 | static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit) |
779e6e1c | 316 | { |
779e6e1c | 317 | unsigned long schid; |
7a0b4cbc JG |
318 | unsigned int fc = 0; |
319 | u64 start_time = 0; | |
320 | int cc; | |
779e6e1c | 321 | |
7a0b4cbc | 322 | if (q->u.out.use_enh_siga) |
7a0f4755 | 323 | fc = 3; |
7a0b4cbc JG |
324 | |
325 | if (is_qebsm(q)) { | |
779e6e1c JG |
326 | schid = q->irq_ptr->sch_token; |
327 | fc |= 0x80; | |
328 | } | |
7a0b4cbc JG |
329 | else |
330 | schid = *((u32 *)&q->irq_ptr->schid); | |
779e6e1c | 331 | |
779e6e1c | 332 | again: |
7a0b4cbc JG |
333 | cc = do_siga_output(schid, q->mask, busy_bit, fc); |
334 | ||
335 | /* hipersocket busy condition */ | |
336 | if (*busy_bit) { | |
337 | WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2); | |
58eb27cd | 338 | |
7a0b4cbc | 339 | if (!start_time) { |
3a601bfe | 340 | start_time = get_clock(); |
7a0b4cbc JG |
341 | goto again; |
342 | } | |
3a601bfe | 343 | if ((get_clock() - start_time) < QDIO_BUSY_BIT_PATIENCE) |
779e6e1c JG |
344 | goto again; |
345 | } | |
779e6e1c JG |
346 | return cc; |
347 | } | |
348 | ||
349 | static inline int qdio_siga_input(struct qdio_q *q) | |
350 | { | |
351 | int cc; | |
352 | ||
22f99347 | 353 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr); |
6486cda6 | 354 | qperf_inc(q, siga_read); |
779e6e1c JG |
355 | |
356 | cc = do_siga_input(q->irq_ptr->schid, q->mask); | |
357 | if (cc) | |
22f99347 | 358 | DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc); |
779e6e1c JG |
359 | return cc; |
360 | } | |
361 | ||
60b5df2f | 362 | static inline void qdio_sync_after_thinint(struct qdio_q *q) |
779e6e1c JG |
363 | { |
364 | if (pci_out_supported(q)) { | |
365 | if (need_siga_sync_thinint(q)) | |
366 | qdio_siga_sync_all(q); | |
367 | else if (need_siga_sync_out_thinint(q)) | |
368 | qdio_siga_sync_out(q); | |
369 | } else | |
370 | qdio_siga_sync_q(q); | |
371 | } | |
372 | ||
60b5df2f JG |
373 | int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr, |
374 | unsigned char *state) | |
375 | { | |
376 | qdio_siga_sync_q(q); | |
377 | return get_buf_states(q, bufnr, state, 1, 0); | |
378 | } | |
379 | ||
380 | static inline void qdio_stop_polling(struct qdio_q *q) | |
779e6e1c | 381 | { |
50f769df | 382 | if (!q->u.in.polling) |
779e6e1c | 383 | return; |
50f769df | 384 | |
779e6e1c | 385 | q->u.in.polling = 0; |
6486cda6 | 386 | qperf_inc(q, stop_polling); |
779e6e1c JG |
387 | |
388 | /* show the card that we are not polling anymore */ | |
50f769df | 389 | if (is_qebsm(q)) { |
e85dea0e | 390 | set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, |
50f769df JG |
391 | q->u.in.ack_count); |
392 | q->u.in.ack_count = 0; | |
393 | } else | |
e85dea0e | 394 | set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); |
779e6e1c JG |
395 | } |
396 | ||
d307297f JG |
397 | static inline void account_sbals(struct qdio_q *q, int count) |
398 | { | |
399 | int pos = 0; | |
400 | ||
401 | q->q_stats.nr_sbal_total += count; | |
402 | if (count == QDIO_MAX_BUFFERS_MASK) { | |
403 | q->q_stats.nr_sbals[7]++; | |
404 | return; | |
405 | } | |
406 | while (count >>= 1) | |
407 | pos++; | |
408 | q->q_stats.nr_sbals[pos]++; | |
409 | } | |
410 | ||
50f769df | 411 | static void announce_buffer_error(struct qdio_q *q, int count) |
779e6e1c | 412 | { |
7a0b4cbc | 413 | q->qdio_error |= QDIO_ERROR_SLSB_STATE; |
50f769df JG |
414 | |
415 | /* special handling for no target buffer empty */ | |
416 | if ((!q->is_input_q && | |
417 | (q->sbal[q->first_to_check]->element[15].flags & 0xff) == 0x10)) { | |
6486cda6 | 418 | qperf_inc(q, target_full); |
1d7e1500 | 419 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", |
50f769df JG |
420 | q->first_to_check); |
421 | return; | |
422 | } | |
423 | ||
22f99347 JG |
424 | DBF_ERROR("%4x BUF ERROR", SCH_NO(q)); |
425 | DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr); | |
50f769df | 426 | DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count); |
22f99347 JG |
427 | DBF_ERROR("F14:%2x F15:%2x", |
428 | q->sbal[q->first_to_check]->element[14].flags & 0xff, | |
429 | q->sbal[q->first_to_check]->element[15].flags & 0xff); | |
50f769df | 430 | } |
779e6e1c | 431 | |
50f769df JG |
432 | static inline void inbound_primed(struct qdio_q *q, int count) |
433 | { | |
434 | int new; | |
435 | ||
1d7e1500 | 436 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count); |
50f769df JG |
437 | |
438 | /* for QEBSM the ACK was already set by EQBS */ | |
439 | if (is_qebsm(q)) { | |
440 | if (!q->u.in.polling) { | |
441 | q->u.in.polling = 1; | |
442 | q->u.in.ack_count = count; | |
e85dea0e | 443 | q->u.in.ack_start = q->first_to_check; |
50f769df JG |
444 | return; |
445 | } | |
446 | ||
447 | /* delete the previous ACK's */ | |
e85dea0e | 448 | set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, |
50f769df JG |
449 | q->u.in.ack_count); |
450 | q->u.in.ack_count = count; | |
e85dea0e | 451 | q->u.in.ack_start = q->first_to_check; |
50f769df JG |
452 | return; |
453 | } | |
454 | ||
455 | /* | |
456 | * ACK the newest buffer. The ACK will be removed in qdio_stop_polling | |
457 | * or by the next inbound run. | |
458 | */ | |
459 | new = add_buf(q->first_to_check, count - 1); | |
460 | if (q->u.in.polling) { | |
461 | /* reset the previous ACK but first set the new one */ | |
462 | set_buf_state(q, new, SLSB_P_INPUT_ACK); | |
e85dea0e | 463 | set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); |
3fdf1e18 | 464 | } else { |
50f769df | 465 | q->u.in.polling = 1; |
3fdf1e18 | 466 | set_buf_state(q, new, SLSB_P_INPUT_ACK); |
50f769df JG |
467 | } |
468 | ||
e85dea0e | 469 | q->u.in.ack_start = new; |
50f769df JG |
470 | count--; |
471 | if (!count) | |
472 | return; | |
6541f7b6 JG |
473 | /* need to change ALL buffers to get more interrupts */ |
474 | set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count); | |
779e6e1c JG |
475 | } |
476 | ||
477 | static int get_inbound_buffer_frontier(struct qdio_q *q) | |
478 | { | |
479 | int count, stop; | |
480 | unsigned char state; | |
481 | ||
779e6e1c JG |
482 | /* |
483 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved | |
484 | * would return 0. | |
485 | */ | |
486 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); | |
487 | stop = add_buf(q->first_to_check, count); | |
488 | ||
779e6e1c JG |
489 | if (q->first_to_check == stop) |
490 | goto out; | |
491 | ||
36e3e721 JG |
492 | /* |
493 | * No siga sync here, as a PCI or we after a thin interrupt | |
494 | * already sync'ed the queues. | |
495 | */ | |
50f769df | 496 | count = get_buf_states(q, q->first_to_check, &state, count, 1); |
779e6e1c JG |
497 | if (!count) |
498 | goto out; | |
499 | ||
500 | switch (state) { | |
501 | case SLSB_P_INPUT_PRIMED: | |
50f769df | 502 | inbound_primed(q, count); |
779e6e1c | 503 | q->first_to_check = add_buf(q->first_to_check, count); |
8bcd9b04 | 504 | if (atomic_sub(count, &q->nr_buf_used) == 0) |
6486cda6 | 505 | qperf_inc(q, inbound_queue_full); |
d307297f JG |
506 | if (q->irq_ptr->perf_stat_enabled) |
507 | account_sbals(q, count); | |
36e3e721 | 508 | break; |
779e6e1c | 509 | case SLSB_P_INPUT_ERROR: |
50f769df | 510 | announce_buffer_error(q, count); |
779e6e1c JG |
511 | /* process the buffer, the upper layer will take care of it */ |
512 | q->first_to_check = add_buf(q->first_to_check, count); | |
513 | atomic_sub(count, &q->nr_buf_used); | |
d307297f JG |
514 | if (q->irq_ptr->perf_stat_enabled) |
515 | account_sbals_error(q, count); | |
779e6e1c JG |
516 | break; |
517 | case SLSB_CU_INPUT_EMPTY: | |
518 | case SLSB_P_INPUT_NOT_INIT: | |
519 | case SLSB_P_INPUT_ACK: | |
d307297f JG |
520 | if (q->irq_ptr->perf_stat_enabled) |
521 | q->q_stats.nr_sbal_nop++; | |
22f99347 | 522 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop"); |
779e6e1c JG |
523 | break; |
524 | default: | |
525 | BUG(); | |
526 | } | |
527 | out: | |
779e6e1c JG |
528 | return q->first_to_check; |
529 | } | |
530 | ||
60b5df2f | 531 | static int qdio_inbound_q_moved(struct qdio_q *q) |
779e6e1c JG |
532 | { |
533 | int bufnr; | |
534 | ||
535 | bufnr = get_inbound_buffer_frontier(q); | |
536 | ||
e85dea0e JG |
537 | if ((bufnr != q->last_move) || q->qdio_error) { |
538 | q->last_move = bufnr; | |
27d71602 | 539 | if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR) |
3a601bfe | 540 | q->u.in.timestamp = get_clock(); |
779e6e1c JG |
541 | return 1; |
542 | } else | |
543 | return 0; | |
544 | } | |
545 | ||
9a2c160a | 546 | static inline int qdio_inbound_q_done(struct qdio_q *q) |
779e6e1c | 547 | { |
9a1ce28a | 548 | unsigned char state = 0; |
779e6e1c JG |
549 | |
550 | if (!atomic_read(&q->nr_buf_used)) | |
551 | return 1; | |
552 | ||
779e6e1c | 553 | qdio_siga_sync_q(q); |
50f769df | 554 | get_buf_state(q, q->first_to_check, &state, 0); |
9a2c160a | 555 | |
4c52228d | 556 | if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR) |
9a2c160a | 557 | /* more work coming */ |
779e6e1c JG |
558 | return 0; |
559 | ||
9a2c160a JG |
560 | if (is_thinint_irq(q->irq_ptr)) |
561 | return 1; | |
562 | ||
563 | /* don't poll under z/VM */ | |
564 | if (MACHINE_IS_VM) | |
779e6e1c JG |
565 | return 1; |
566 | ||
567 | /* | |
568 | * At this point we know, that inbound first_to_check | |
569 | * has (probably) not moved (see qdio_inbound_processing). | |
570 | */ | |
3a601bfe | 571 | if (get_clock() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) { |
1d7e1500 | 572 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x", |
22f99347 | 573 | q->first_to_check); |
779e6e1c | 574 | return 1; |
9a2c160a | 575 | } else |
60b5df2f | 576 | return 0; |
60b5df2f JG |
577 | } |
578 | ||
579 | static void qdio_kick_handler(struct qdio_q *q) | |
779e6e1c | 580 | { |
9c8a08d7 JG |
581 | int start = q->first_to_kick; |
582 | int end = q->first_to_check; | |
583 | int count; | |
779e6e1c JG |
584 | |
585 | if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) | |
586 | return; | |
587 | ||
9c8a08d7 JG |
588 | count = sub_buf(end, start); |
589 | ||
590 | if (q->is_input_q) { | |
6486cda6 | 591 | qperf_inc(q, inbound_handler); |
1d7e1500 | 592 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count); |
bd6e8a16 | 593 | } else { |
6486cda6 | 594 | qperf_inc(q, outbound_handler); |
1d7e1500 JG |
595 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x", |
596 | start, count); | |
bd6e8a16 | 597 | } |
9c8a08d7 JG |
598 | |
599 | q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count, | |
600 | q->irq_ptr->int_parm); | |
779e6e1c JG |
601 | |
602 | /* for the next time */ | |
9c8a08d7 | 603 | q->first_to_kick = end; |
779e6e1c JG |
604 | q->qdio_error = 0; |
605 | } | |
606 | ||
607 | static void __qdio_inbound_processing(struct qdio_q *q) | |
608 | { | |
6486cda6 | 609 | qperf_inc(q, tasklet_inbound); |
f3eb20fa | 610 | |
779e6e1c JG |
611 | if (!qdio_inbound_q_moved(q)) |
612 | return; | |
613 | ||
9c8a08d7 | 614 | qdio_kick_handler(q); |
779e6e1c | 615 | |
6486cda6 | 616 | if (!qdio_inbound_q_done(q)) { |
779e6e1c | 617 | /* means poll time is not yet over */ |
6486cda6 | 618 | qperf_inc(q, tasklet_inbound_resched); |
f3eb20fa JG |
619 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) { |
620 | tasklet_schedule(&q->tasklet); | |
621 | return; | |
622 | } | |
6486cda6 | 623 | } |
779e6e1c JG |
624 | |
625 | qdio_stop_polling(q); | |
626 | /* | |
627 | * We need to check again to not lose initiative after | |
628 | * resetting the ACK state. | |
629 | */ | |
6486cda6 JG |
630 | if (!qdio_inbound_q_done(q)) { |
631 | qperf_inc(q, tasklet_inbound_resched2); | |
f3eb20fa JG |
632 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) |
633 | tasklet_schedule(&q->tasklet); | |
6486cda6 | 634 | } |
779e6e1c JG |
635 | } |
636 | ||
779e6e1c JG |
637 | void qdio_inbound_processing(unsigned long data) |
638 | { | |
639 | struct qdio_q *q = (struct qdio_q *)data; | |
640 | __qdio_inbound_processing(q); | |
641 | } | |
642 | ||
643 | static int get_outbound_buffer_frontier(struct qdio_q *q) | |
644 | { | |
645 | int count, stop; | |
646 | unsigned char state; | |
647 | ||
648 | if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) || | |
649 | (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q))) | |
650 | qdio_siga_sync_q(q); | |
651 | ||
652 | /* | |
653 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved | |
654 | * would return 0. | |
655 | */ | |
656 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); | |
657 | stop = add_buf(q->first_to_check, count); | |
658 | ||
779e6e1c JG |
659 | if (q->first_to_check == stop) |
660 | return q->first_to_check; | |
661 | ||
50f769df | 662 | count = get_buf_states(q, q->first_to_check, &state, count, 0); |
779e6e1c JG |
663 | if (!count) |
664 | return q->first_to_check; | |
665 | ||
666 | switch (state) { | |
667 | case SLSB_P_OUTPUT_EMPTY: | |
668 | /* the adapter got it */ | |
1d7e1500 | 669 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %02x", q->nr, count); |
779e6e1c JG |
670 | |
671 | atomic_sub(count, &q->nr_buf_used); | |
672 | q->first_to_check = add_buf(q->first_to_check, count); | |
d307297f JG |
673 | if (q->irq_ptr->perf_stat_enabled) |
674 | account_sbals(q, count); | |
36e3e721 | 675 | break; |
779e6e1c | 676 | case SLSB_P_OUTPUT_ERROR: |
50f769df | 677 | announce_buffer_error(q, count); |
779e6e1c JG |
678 | /* process the buffer, the upper layer will take care of it */ |
679 | q->first_to_check = add_buf(q->first_to_check, count); | |
680 | atomic_sub(count, &q->nr_buf_used); | |
d307297f JG |
681 | if (q->irq_ptr->perf_stat_enabled) |
682 | account_sbals_error(q, count); | |
779e6e1c JG |
683 | break; |
684 | case SLSB_CU_OUTPUT_PRIMED: | |
685 | /* the adapter has not fetched the output yet */ | |
d307297f JG |
686 | if (q->irq_ptr->perf_stat_enabled) |
687 | q->q_stats.nr_sbal_nop++; | |
22f99347 | 688 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr); |
779e6e1c JG |
689 | break; |
690 | case SLSB_P_OUTPUT_NOT_INIT: | |
691 | case SLSB_P_OUTPUT_HALTED: | |
692 | break; | |
693 | default: | |
694 | BUG(); | |
695 | } | |
696 | return q->first_to_check; | |
697 | } | |
698 | ||
699 | /* all buffers processed? */ | |
700 | static inline int qdio_outbound_q_done(struct qdio_q *q) | |
701 | { | |
702 | return atomic_read(&q->nr_buf_used) == 0; | |
703 | } | |
704 | ||
705 | static inline int qdio_outbound_q_moved(struct qdio_q *q) | |
706 | { | |
707 | int bufnr; | |
708 | ||
709 | bufnr = get_outbound_buffer_frontier(q); | |
710 | ||
e85dea0e JG |
711 | if ((bufnr != q->last_move) || q->qdio_error) { |
712 | q->last_move = bufnr; | |
22f99347 | 713 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr); |
779e6e1c JG |
714 | return 1; |
715 | } else | |
716 | return 0; | |
717 | } | |
718 | ||
d303b6fd | 719 | static int qdio_kick_outbound_q(struct qdio_q *q) |
779e6e1c | 720 | { |
7a0b4cbc JG |
721 | unsigned int busy_bit; |
722 | int cc; | |
779e6e1c JG |
723 | |
724 | if (!need_siga_out(q)) | |
d303b6fd | 725 | return 0; |
779e6e1c | 726 | |
7a0b4cbc | 727 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr); |
6486cda6 | 728 | qperf_inc(q, siga_write); |
7a0b4cbc JG |
729 | |
730 | cc = qdio_siga_output(q, &busy_bit); | |
731 | switch (cc) { | |
779e6e1c | 732 | case 0: |
779e6e1c | 733 | break; |
7a0b4cbc JG |
734 | case 2: |
735 | if (busy_bit) { | |
736 | DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr); | |
d303b6fd JG |
737 | cc |= QDIO_ERROR_SIGA_BUSY; |
738 | } else | |
739 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr); | |
7a0b4cbc JG |
740 | break; |
741 | case 1: | |
742 | case 3: | |
743 | DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc); | |
7a0b4cbc | 744 | break; |
779e6e1c | 745 | } |
d303b6fd | 746 | return cc; |
779e6e1c JG |
747 | } |
748 | ||
779e6e1c JG |
749 | static void __qdio_outbound_processing(struct qdio_q *q) |
750 | { | |
6486cda6 | 751 | qperf_inc(q, tasklet_outbound); |
779e6e1c JG |
752 | BUG_ON(atomic_read(&q->nr_buf_used) < 0); |
753 | ||
754 | if (qdio_outbound_q_moved(q)) | |
9c8a08d7 | 755 | qdio_kick_handler(q); |
779e6e1c | 756 | |
c38f9608 | 757 | if (queue_type(q) == QDIO_ZFCP_QFMT) |
779e6e1c | 758 | if (!pci_out_supported(q) && !qdio_outbound_q_done(q)) |
c38f9608 | 759 | goto sched; |
779e6e1c JG |
760 | |
761 | /* bail out for HiperSockets unicast queues */ | |
762 | if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q)) | |
763 | return; | |
764 | ||
4bcb3a37 | 765 | if ((queue_type(q) == QDIO_IQDIO_QFMT) && |
c38f9608 JG |
766 | (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL) |
767 | goto sched; | |
4bcb3a37 | 768 | |
779e6e1c JG |
769 | if (q->u.out.pci_out_enabled) |
770 | return; | |
771 | ||
772 | /* | |
773 | * Now we know that queue type is either qeth without pci enabled | |
774 | * or HiperSockets multicast. Make sure buffer switch from PRIMED to | |
775 | * EMPTY is noticed and outbound_handler is called after some time. | |
776 | */ | |
777 | if (qdio_outbound_q_done(q)) | |
778 | del_timer(&q->u.out.timer); | |
6486cda6 JG |
779 | else |
780 | if (!timer_pending(&q->u.out.timer)) | |
779e6e1c | 781 | mod_timer(&q->u.out.timer, jiffies + 10 * HZ); |
c38f9608 JG |
782 | return; |
783 | ||
784 | sched: | |
785 | if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) | |
786 | return; | |
787 | tasklet_schedule(&q->tasklet); | |
779e6e1c JG |
788 | } |
789 | ||
790 | /* outbound tasklet */ | |
791 | void qdio_outbound_processing(unsigned long data) | |
792 | { | |
793 | struct qdio_q *q = (struct qdio_q *)data; | |
794 | __qdio_outbound_processing(q); | |
795 | } | |
796 | ||
797 | void qdio_outbound_timer(unsigned long data) | |
798 | { | |
799 | struct qdio_q *q = (struct qdio_q *)data; | |
c38f9608 JG |
800 | |
801 | if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) | |
802 | return; | |
779e6e1c JG |
803 | tasklet_schedule(&q->tasklet); |
804 | } | |
805 | ||
60b5df2f | 806 | static inline void qdio_check_outbound_after_thinint(struct qdio_q *q) |
779e6e1c JG |
807 | { |
808 | struct qdio_q *out; | |
809 | int i; | |
810 | ||
811 | if (!pci_out_supported(q)) | |
812 | return; | |
813 | ||
814 | for_each_output_queue(q->irq_ptr, out, i) | |
815 | if (!qdio_outbound_q_done(out)) | |
816 | tasklet_schedule(&out->tasklet); | |
817 | } | |
818 | ||
60b5df2f JG |
819 | static void __tiqdio_inbound_processing(struct qdio_q *q) |
820 | { | |
6486cda6 | 821 | qperf_inc(q, tasklet_inbound); |
60b5df2f JG |
822 | qdio_sync_after_thinint(q); |
823 | ||
824 | /* | |
825 | * The interrupt could be caused by a PCI request. Check the | |
826 | * PCI capable outbound queues. | |
827 | */ | |
828 | qdio_check_outbound_after_thinint(q); | |
829 | ||
830 | if (!qdio_inbound_q_moved(q)) | |
831 | return; | |
832 | ||
833 | qdio_kick_handler(q); | |
834 | ||
9a2c160a | 835 | if (!qdio_inbound_q_done(q)) { |
6486cda6 | 836 | qperf_inc(q, tasklet_inbound_resched); |
e2910bcf | 837 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) { |
60b5df2f | 838 | tasklet_schedule(&q->tasklet); |
e2910bcf JG |
839 | return; |
840 | } | |
60b5df2f JG |
841 | } |
842 | ||
843 | qdio_stop_polling(q); | |
844 | /* | |
845 | * We need to check again to not lose initiative after | |
846 | * resetting the ACK state. | |
847 | */ | |
9a2c160a | 848 | if (!qdio_inbound_q_done(q)) { |
6486cda6 | 849 | qperf_inc(q, tasklet_inbound_resched2); |
60b5df2f JG |
850 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) |
851 | tasklet_schedule(&q->tasklet); | |
852 | } | |
853 | } | |
854 | ||
855 | void tiqdio_inbound_processing(unsigned long data) | |
856 | { | |
857 | struct qdio_q *q = (struct qdio_q *)data; | |
858 | __tiqdio_inbound_processing(q); | |
859 | } | |
860 | ||
779e6e1c JG |
861 | static inline void qdio_set_state(struct qdio_irq *irq_ptr, |
862 | enum qdio_irq_states state) | |
863 | { | |
22f99347 | 864 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state); |
779e6e1c JG |
865 | |
866 | irq_ptr->state = state; | |
867 | mb(); | |
868 | } | |
869 | ||
22f99347 | 870 | static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb) |
779e6e1c | 871 | { |
779e6e1c | 872 | if (irb->esw.esw0.erw.cons) { |
22f99347 JG |
873 | DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no); |
874 | DBF_ERROR_HEX(irb, 64); | |
875 | DBF_ERROR_HEX(irb->ecw, 64); | |
779e6e1c JG |
876 | } |
877 | } | |
878 | ||
879 | /* PCI interrupt handler */ | |
880 | static void qdio_int_handler_pci(struct qdio_irq *irq_ptr) | |
881 | { | |
882 | int i; | |
883 | struct qdio_q *q; | |
884 | ||
c38f9608 JG |
885 | if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) |
886 | return; | |
887 | ||
d36deae7 JG |
888 | for_each_input_queue(irq_ptr, q, i) { |
889 | if (q->u.in.queue_start_poll) { | |
890 | /* skip if polling is enabled or already in work */ | |
891 | if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, | |
892 | &q->u.in.queue_irq_state)) { | |
893 | qperf_inc(q, int_discarded); | |
894 | continue; | |
895 | } | |
896 | q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr, | |
897 | q->irq_ptr->int_parm); | |
898 | } else | |
899 | tasklet_schedule(&q->tasklet); | |
900 | } | |
779e6e1c JG |
901 | |
902 | if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED)) | |
903 | return; | |
904 | ||
905 | for_each_output_queue(irq_ptr, q, i) { | |
906 | if (qdio_outbound_q_done(q)) | |
907 | continue; | |
908 | ||
909 | if (!siga_syncs_out_pci(q)) | |
910 | qdio_siga_sync_q(q); | |
911 | ||
912 | tasklet_schedule(&q->tasklet); | |
913 | } | |
914 | } | |
915 | ||
916 | static void qdio_handle_activate_check(struct ccw_device *cdev, | |
917 | unsigned long intparm, int cstat, int dstat) | |
918 | { | |
919 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
920 | struct qdio_q *q; | |
779e6e1c | 921 | |
22f99347 JG |
922 | DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no); |
923 | DBF_ERROR("intp :%lx", intparm); | |
924 | DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); | |
779e6e1c JG |
925 | |
926 | if (irq_ptr->nr_input_qs) { | |
927 | q = irq_ptr->input_qs[0]; | |
928 | } else if (irq_ptr->nr_output_qs) { | |
929 | q = irq_ptr->output_qs[0]; | |
930 | } else { | |
931 | dump_stack(); | |
932 | goto no_handler; | |
933 | } | |
934 | q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION, | |
935 | 0, -1, -1, irq_ptr->int_parm); | |
936 | no_handler: | |
937 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); | |
938 | } | |
939 | ||
4c575423 JG |
940 | static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat, |
941 | int dstat) | |
779e6e1c JG |
942 | { |
943 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
944 | ||
4c575423 | 945 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq"); |
779e6e1c | 946 | |
4c575423 | 947 | if (cstat) |
779e6e1c | 948 | goto error; |
4c575423 | 949 | if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END)) |
779e6e1c | 950 | goto error; |
4c575423 JG |
951 | if (!(dstat & DEV_STAT_DEV_END)) |
952 | goto error; | |
953 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED); | |
954 | return; | |
955 | ||
779e6e1c | 956 | error: |
22f99347 JG |
957 | DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no); |
958 | DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); | |
779e6e1c | 959 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); |
779e6e1c JG |
960 | } |
961 | ||
962 | /* qdio interrupt handler */ | |
963 | void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm, | |
964 | struct irb *irb) | |
965 | { | |
966 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
967 | int cstat, dstat; | |
779e6e1c | 968 | |
779e6e1c | 969 | if (!intparm || !irq_ptr) { |
22f99347 | 970 | DBF_ERROR("qint:%4x", cdev->private->schid.sch_no); |
779e6e1c JG |
971 | return; |
972 | } | |
973 | ||
30d77c3e | 974 | kstat_cpu(smp_processor_id()).irqs[IOINT_QDI]++; |
09a308f3 JG |
975 | if (irq_ptr->perf_stat_enabled) |
976 | irq_ptr->perf_stat.qdio_int++; | |
977 | ||
779e6e1c JG |
978 | if (IS_ERR(irb)) { |
979 | switch (PTR_ERR(irb)) { | |
980 | case -EIO: | |
22f99347 | 981 | DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no); |
75cb71f3 JG |
982 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); |
983 | wake_up(&cdev->private->wait_q); | |
779e6e1c JG |
984 | return; |
985 | default: | |
986 | WARN_ON(1); | |
987 | return; | |
988 | } | |
989 | } | |
22f99347 | 990 | qdio_irq_check_sense(irq_ptr, irb); |
779e6e1c JG |
991 | cstat = irb->scsw.cmd.cstat; |
992 | dstat = irb->scsw.cmd.dstat; | |
993 | ||
994 | switch (irq_ptr->state) { | |
995 | case QDIO_IRQ_STATE_INACTIVE: | |
996 | qdio_establish_handle_irq(cdev, cstat, dstat); | |
997 | break; | |
779e6e1c JG |
998 | case QDIO_IRQ_STATE_CLEANUP: |
999 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1000 | break; | |
779e6e1c JG |
1001 | case QDIO_IRQ_STATE_ESTABLISHED: |
1002 | case QDIO_IRQ_STATE_ACTIVE: | |
1003 | if (cstat & SCHN_STAT_PCI) { | |
1004 | qdio_int_handler_pci(irq_ptr); | |
779e6e1c JG |
1005 | return; |
1006 | } | |
4c575423 | 1007 | if (cstat || dstat) |
779e6e1c JG |
1008 | qdio_handle_activate_check(cdev, intparm, cstat, |
1009 | dstat); | |
4c575423 | 1010 | break; |
959153d3 JG |
1011 | case QDIO_IRQ_STATE_STOPPED: |
1012 | break; | |
779e6e1c JG |
1013 | default: |
1014 | WARN_ON(1); | |
1015 | } | |
1016 | wake_up(&cdev->private->wait_q); | |
1017 | } | |
1018 | ||
1019 | /** | |
1020 | * qdio_get_ssqd_desc - get qdio subchannel description | |
1021 | * @cdev: ccw device to get description for | |
bbd50e17 | 1022 | * @data: where to store the ssqd |
779e6e1c | 1023 | * |
bbd50e17 JG |
1024 | * Returns 0 or an error code. The results of the chsc are stored in the |
1025 | * specified structure. | |
779e6e1c | 1026 | */ |
bbd50e17 JG |
1027 | int qdio_get_ssqd_desc(struct ccw_device *cdev, |
1028 | struct qdio_ssqd_desc *data) | |
779e6e1c | 1029 | { |
779e6e1c | 1030 | |
bbd50e17 JG |
1031 | if (!cdev || !cdev->private) |
1032 | return -EINVAL; | |
1033 | ||
22f99347 | 1034 | DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no); |
bbd50e17 | 1035 | return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data); |
779e6e1c JG |
1036 | } |
1037 | EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc); | |
1038 | ||
779e6e1c JG |
1039 | static void qdio_shutdown_queues(struct ccw_device *cdev) |
1040 | { | |
1041 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1042 | struct qdio_q *q; | |
1043 | int i; | |
1044 | ||
1045 | for_each_input_queue(irq_ptr, q, i) | |
c38f9608 | 1046 | tasklet_kill(&q->tasklet); |
779e6e1c JG |
1047 | |
1048 | for_each_output_queue(irq_ptr, q, i) { | |
779e6e1c | 1049 | del_timer(&q->u.out.timer); |
c38f9608 | 1050 | tasklet_kill(&q->tasklet); |
779e6e1c JG |
1051 | } |
1052 | } | |
1053 | ||
1054 | /** | |
1055 | * qdio_shutdown - shut down a qdio subchannel | |
1056 | * @cdev: associated ccw device | |
1057 | * @how: use halt or clear to shutdown | |
1058 | */ | |
1059 | int qdio_shutdown(struct ccw_device *cdev, int how) | |
1060 | { | |
22f99347 | 1061 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
779e6e1c JG |
1062 | int rc; |
1063 | unsigned long flags; | |
779e6e1c | 1064 | |
779e6e1c JG |
1065 | if (!irq_ptr) |
1066 | return -ENODEV; | |
1067 | ||
b4547402 | 1068 | BUG_ON(irqs_disabled()); |
22f99347 JG |
1069 | DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no); |
1070 | ||
779e6e1c JG |
1071 | mutex_lock(&irq_ptr->setup_mutex); |
1072 | /* | |
1073 | * Subchannel was already shot down. We cannot prevent being called | |
1074 | * twice since cio may trigger a shutdown asynchronously. | |
1075 | */ | |
1076 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { | |
1077 | mutex_unlock(&irq_ptr->setup_mutex); | |
1078 | return 0; | |
1079 | } | |
1080 | ||
c38f9608 JG |
1081 | /* |
1082 | * Indicate that the device is going down. Scheduling the queue | |
1083 | * tasklets is forbidden from here on. | |
1084 | */ | |
1085 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); | |
1086 | ||
779e6e1c JG |
1087 | tiqdio_remove_input_queues(irq_ptr); |
1088 | qdio_shutdown_queues(cdev); | |
1089 | qdio_shutdown_debug_entries(irq_ptr, cdev); | |
1090 | ||
1091 | /* cleanup subchannel */ | |
1092 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1093 | ||
1094 | if (how & QDIO_FLAG_CLEANUP_USING_CLEAR) | |
1095 | rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP); | |
1096 | else | |
1097 | /* default behaviour is halt */ | |
1098 | rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP); | |
1099 | if (rc) { | |
22f99347 JG |
1100 | DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no); |
1101 | DBF_ERROR("rc:%4d", rc); | |
779e6e1c JG |
1102 | goto no_cleanup; |
1103 | } | |
1104 | ||
1105 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP); | |
1106 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1107 | wait_event_interruptible_timeout(cdev->private->wait_q, | |
1108 | irq_ptr->state == QDIO_IRQ_STATE_INACTIVE || | |
1109 | irq_ptr->state == QDIO_IRQ_STATE_ERR, | |
1110 | 10 * HZ); | |
1111 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1112 | ||
1113 | no_cleanup: | |
1114 | qdio_shutdown_thinint(irq_ptr); | |
1115 | ||
1116 | /* restore interrupt handler */ | |
1117 | if ((void *)cdev->handler == (void *)qdio_int_handler) | |
1118 | cdev->handler = irq_ptr->orig_handler; | |
1119 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1120 | ||
1121 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1122 | mutex_unlock(&irq_ptr->setup_mutex); | |
779e6e1c JG |
1123 | if (rc) |
1124 | return rc; | |
1125 | return 0; | |
1126 | } | |
1127 | EXPORT_SYMBOL_GPL(qdio_shutdown); | |
1128 | ||
1129 | /** | |
1130 | * qdio_free - free data structures for a qdio subchannel | |
1131 | * @cdev: associated ccw device | |
1132 | */ | |
1133 | int qdio_free(struct ccw_device *cdev) | |
1134 | { | |
22f99347 | 1135 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
58eb27cd | 1136 | |
779e6e1c JG |
1137 | if (!irq_ptr) |
1138 | return -ENODEV; | |
1139 | ||
22f99347 | 1140 | DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no); |
779e6e1c | 1141 | mutex_lock(&irq_ptr->setup_mutex); |
22f99347 JG |
1142 | |
1143 | if (irq_ptr->debug_area != NULL) { | |
1144 | debug_unregister(irq_ptr->debug_area); | |
1145 | irq_ptr->debug_area = NULL; | |
1146 | } | |
779e6e1c JG |
1147 | cdev->private->qdio_data = NULL; |
1148 | mutex_unlock(&irq_ptr->setup_mutex); | |
1149 | ||
1150 | qdio_release_memory(irq_ptr); | |
1151 | return 0; | |
1152 | } | |
1153 | EXPORT_SYMBOL_GPL(qdio_free); | |
1154 | ||
779e6e1c JG |
1155 | /** |
1156 | * qdio_allocate - allocate qdio queues and associated data | |
1157 | * @init_data: initialization data | |
1158 | */ | |
1159 | int qdio_allocate(struct qdio_initialize *init_data) | |
1160 | { | |
1161 | struct qdio_irq *irq_ptr; | |
779e6e1c | 1162 | |
22f99347 | 1163 | DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no); |
779e6e1c JG |
1164 | |
1165 | if ((init_data->no_input_qs && !init_data->input_handler) || | |
1166 | (init_data->no_output_qs && !init_data->output_handler)) | |
1167 | return -EINVAL; | |
1168 | ||
1169 | if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) || | |
1170 | (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)) | |
1171 | return -EINVAL; | |
1172 | ||
1173 | if ((!init_data->input_sbal_addr_array) || | |
1174 | (!init_data->output_sbal_addr_array)) | |
1175 | return -EINVAL; | |
1176 | ||
779e6e1c JG |
1177 | /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */ |
1178 | irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
1179 | if (!irq_ptr) | |
1180 | goto out_err; | |
779e6e1c JG |
1181 | |
1182 | mutex_init(&irq_ptr->setup_mutex); | |
22f99347 | 1183 | qdio_allocate_dbf(init_data, irq_ptr); |
779e6e1c JG |
1184 | |
1185 | /* | |
1186 | * Allocate a page for the chsc calls in qdio_establish. | |
1187 | * Must be pre-allocated since a zfcp recovery will call | |
1188 | * qdio_establish. In case of low memory and swap on a zfcp disk | |
1189 | * we may not be able to allocate memory otherwise. | |
1190 | */ | |
1191 | irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL); | |
1192 | if (!irq_ptr->chsc_page) | |
1193 | goto out_rel; | |
1194 | ||
1195 | /* qdr is used in ccw1.cda which is u32 */ | |
3b8e3004 | 1196 | irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
779e6e1c JG |
1197 | if (!irq_ptr->qdr) |
1198 | goto out_rel; | |
1199 | WARN_ON((unsigned long)irq_ptr->qdr & 0xfff); | |
1200 | ||
779e6e1c JG |
1201 | if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs, |
1202 | init_data->no_output_qs)) | |
1203 | goto out_rel; | |
1204 | ||
1205 | init_data->cdev->private->qdio_data = irq_ptr; | |
1206 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1207 | return 0; | |
1208 | out_rel: | |
1209 | qdio_release_memory(irq_ptr); | |
1210 | out_err: | |
1211 | return -ENOMEM; | |
1212 | } | |
1213 | EXPORT_SYMBOL_GPL(qdio_allocate); | |
1214 | ||
1215 | /** | |
1216 | * qdio_establish - establish queues on a qdio subchannel | |
1217 | * @init_data: initialization data | |
1218 | */ | |
1219 | int qdio_establish(struct qdio_initialize *init_data) | |
1220 | { | |
779e6e1c JG |
1221 | struct qdio_irq *irq_ptr; |
1222 | struct ccw_device *cdev = init_data->cdev; | |
1223 | unsigned long saveflags; | |
1224 | int rc; | |
1225 | ||
22f99347 | 1226 | DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no); |
58eb27cd | 1227 | |
779e6e1c JG |
1228 | irq_ptr = cdev->private->qdio_data; |
1229 | if (!irq_ptr) | |
1230 | return -ENODEV; | |
1231 | ||
1232 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1233 | return -EINVAL; | |
1234 | ||
779e6e1c JG |
1235 | mutex_lock(&irq_ptr->setup_mutex); |
1236 | qdio_setup_irq(init_data); | |
1237 | ||
1238 | rc = qdio_establish_thinint(irq_ptr); | |
1239 | if (rc) { | |
1240 | mutex_unlock(&irq_ptr->setup_mutex); | |
1241 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1242 | return rc; | |
1243 | } | |
1244 | ||
1245 | /* establish q */ | |
1246 | irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd; | |
1247 | irq_ptr->ccw.flags = CCW_FLAG_SLI; | |
1248 | irq_ptr->ccw.count = irq_ptr->equeue.count; | |
1249 | irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr); | |
1250 | ||
1251 | spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); | |
1252 | ccw_device_set_options_mask(cdev, 0); | |
1253 | ||
1254 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0); | |
1255 | if (rc) { | |
22f99347 JG |
1256 | DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no); |
1257 | DBF_ERROR("rc:%4x", rc); | |
779e6e1c JG |
1258 | } |
1259 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); | |
1260 | ||
1261 | if (rc) { | |
1262 | mutex_unlock(&irq_ptr->setup_mutex); | |
1263 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1264 | return rc; | |
1265 | } | |
1266 | ||
1267 | wait_event_interruptible_timeout(cdev->private->wait_q, | |
1268 | irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED || | |
1269 | irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ); | |
1270 | ||
1271 | if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) { | |
1272 | mutex_unlock(&irq_ptr->setup_mutex); | |
1273 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1274 | return -EIO; | |
1275 | } | |
1276 | ||
1277 | qdio_setup_ssqd_info(irq_ptr); | |
22f99347 JG |
1278 | DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc); |
1279 | DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac); | |
779e6e1c JG |
1280 | |
1281 | /* qebsm is now setup if available, initialize buffer states */ | |
1282 | qdio_init_buf_states(irq_ptr); | |
1283 | ||
1284 | mutex_unlock(&irq_ptr->setup_mutex); | |
1285 | qdio_print_subchannel_info(irq_ptr, cdev); | |
1286 | qdio_setup_debug_entries(irq_ptr, cdev); | |
1287 | return 0; | |
1288 | } | |
1289 | EXPORT_SYMBOL_GPL(qdio_establish); | |
1290 | ||
1291 | /** | |
1292 | * qdio_activate - activate queues on a qdio subchannel | |
1293 | * @cdev: associated cdev | |
1294 | */ | |
1295 | int qdio_activate(struct ccw_device *cdev) | |
1296 | { | |
1297 | struct qdio_irq *irq_ptr; | |
1298 | int rc; | |
1299 | unsigned long saveflags; | |
779e6e1c | 1300 | |
22f99347 | 1301 | DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no); |
58eb27cd | 1302 | |
779e6e1c JG |
1303 | irq_ptr = cdev->private->qdio_data; |
1304 | if (!irq_ptr) | |
1305 | return -ENODEV; | |
1306 | ||
1307 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1308 | return -EINVAL; | |
1309 | ||
1310 | mutex_lock(&irq_ptr->setup_mutex); | |
1311 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { | |
1312 | rc = -EBUSY; | |
1313 | goto out; | |
1314 | } | |
1315 | ||
779e6e1c JG |
1316 | irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd; |
1317 | irq_ptr->ccw.flags = CCW_FLAG_SLI; | |
1318 | irq_ptr->ccw.count = irq_ptr->aqueue.count; | |
1319 | irq_ptr->ccw.cda = 0; | |
1320 | ||
1321 | spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); | |
1322 | ccw_device_set_options(cdev, CCWDEV_REPORT_ALL); | |
1323 | ||
1324 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE, | |
1325 | 0, DOIO_DENY_PREFETCH); | |
1326 | if (rc) { | |
22f99347 JG |
1327 | DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no); |
1328 | DBF_ERROR("rc:%4x", rc); | |
779e6e1c JG |
1329 | } |
1330 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); | |
1331 | ||
1332 | if (rc) | |
1333 | goto out; | |
1334 | ||
1335 | if (is_thinint_irq(irq_ptr)) | |
1336 | tiqdio_add_input_queues(irq_ptr); | |
1337 | ||
1338 | /* wait for subchannel to become active */ | |
1339 | msleep(5); | |
1340 | ||
1341 | switch (irq_ptr->state) { | |
1342 | case QDIO_IRQ_STATE_STOPPED: | |
1343 | case QDIO_IRQ_STATE_ERR: | |
e4c14e20 JG |
1344 | rc = -EIO; |
1345 | break; | |
779e6e1c JG |
1346 | default: |
1347 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE); | |
1348 | rc = 0; | |
1349 | } | |
1350 | out: | |
1351 | mutex_unlock(&irq_ptr->setup_mutex); | |
1352 | return rc; | |
1353 | } | |
1354 | EXPORT_SYMBOL_GPL(qdio_activate); | |
1355 | ||
1356 | static inline int buf_in_between(int bufnr, int start, int count) | |
1357 | { | |
1358 | int end = add_buf(start, count); | |
1359 | ||
1360 | if (end > start) { | |
1361 | if (bufnr >= start && bufnr < end) | |
1362 | return 1; | |
1363 | else | |
1364 | return 0; | |
1365 | } | |
1366 | ||
1367 | /* wrap-around case */ | |
1368 | if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) || | |
1369 | (bufnr < end)) | |
1370 | return 1; | |
1371 | else | |
1372 | return 0; | |
1373 | } | |
1374 | ||
1375 | /** | |
1376 | * handle_inbound - reset processed input buffers | |
1377 | * @q: queue containing the buffers | |
1378 | * @callflags: flags | |
1379 | * @bufnr: first buffer to process | |
1380 | * @count: how many buffers are emptied | |
1381 | */ | |
d303b6fd JG |
1382 | static int handle_inbound(struct qdio_q *q, unsigned int callflags, |
1383 | int bufnr, int count) | |
779e6e1c | 1384 | { |
d303b6fd | 1385 | int used, diff; |
779e6e1c | 1386 | |
6486cda6 JG |
1387 | qperf_inc(q, inbound_call); |
1388 | ||
50f769df JG |
1389 | if (!q->u.in.polling) |
1390 | goto set; | |
1391 | ||
1392 | /* protect against stop polling setting an ACK for an emptied slsb */ | |
1393 | if (count == QDIO_MAX_BUFFERS_PER_Q) { | |
1394 | /* overwriting everything, just delete polling status */ | |
1395 | q->u.in.polling = 0; | |
1396 | q->u.in.ack_count = 0; | |
1397 | goto set; | |
e85dea0e | 1398 | } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) { |
50f769df | 1399 | if (is_qebsm(q)) { |
e85dea0e | 1400 | /* partial overwrite, just update ack_start */ |
50f769df | 1401 | diff = add_buf(bufnr, count); |
e85dea0e | 1402 | diff = sub_buf(diff, q->u.in.ack_start); |
50f769df JG |
1403 | q->u.in.ack_count -= diff; |
1404 | if (q->u.in.ack_count <= 0) { | |
1405 | q->u.in.polling = 0; | |
1406 | q->u.in.ack_count = 0; | |
50f769df JG |
1407 | goto set; |
1408 | } | |
e85dea0e | 1409 | q->u.in.ack_start = add_buf(q->u.in.ack_start, diff); |
50f769df JG |
1410 | } |
1411 | else | |
1412 | /* the only ACK will be deleted, so stop polling */ | |
779e6e1c | 1413 | q->u.in.polling = 0; |
50f769df | 1414 | } |
779e6e1c | 1415 | |
50f769df | 1416 | set: |
779e6e1c | 1417 | count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count); |
779e6e1c JG |
1418 | |
1419 | used = atomic_add_return(count, &q->nr_buf_used) - count; | |
1420 | BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q); | |
1421 | ||
1422 | /* no need to signal as long as the adapter had free buffers */ | |
1423 | if (used) | |
d303b6fd | 1424 | return 0; |
779e6e1c | 1425 | |
d303b6fd JG |
1426 | if (need_siga_in(q)) |
1427 | return qdio_siga_input(q); | |
1428 | return 0; | |
779e6e1c JG |
1429 | } |
1430 | ||
1431 | /** | |
1432 | * handle_outbound - process filled outbound buffers | |
1433 | * @q: queue containing the buffers | |
1434 | * @callflags: flags | |
1435 | * @bufnr: first buffer to process | |
1436 | * @count: how many buffers are filled | |
1437 | */ | |
d303b6fd JG |
1438 | static int handle_outbound(struct qdio_q *q, unsigned int callflags, |
1439 | int bufnr, int count) | |
779e6e1c JG |
1440 | { |
1441 | unsigned char state; | |
d303b6fd | 1442 | int used, rc = 0; |
779e6e1c | 1443 | |
6486cda6 | 1444 | qperf_inc(q, outbound_call); |
779e6e1c JG |
1445 | |
1446 | count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count); | |
1447 | used = atomic_add_return(count, &q->nr_buf_used); | |
1448 | BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q); | |
1449 | ||
0195843b JG |
1450 | if (used == QDIO_MAX_BUFFERS_PER_Q) |
1451 | qperf_inc(q, outbound_queue_full); | |
1452 | ||
6486cda6 | 1453 | if (callflags & QDIO_FLAG_PCI_OUT) { |
779e6e1c | 1454 | q->u.out.pci_out_enabled = 1; |
6486cda6 JG |
1455 | qperf_inc(q, pci_request_int); |
1456 | } | |
779e6e1c JG |
1457 | else |
1458 | q->u.out.pci_out_enabled = 0; | |
1459 | ||
1460 | if (queue_type(q) == QDIO_IQDIO_QFMT) { | |
1461 | if (multicast_outbound(q)) | |
d303b6fd | 1462 | rc = qdio_kick_outbound_q(q); |
779e6e1c | 1463 | else |
7a0f4755 KDW |
1464 | if ((q->irq_ptr->ssqd_desc.mmwc > 1) && |
1465 | (count > 1) && | |
1466 | (count <= q->irq_ptr->ssqd_desc.mmwc)) { | |
1467 | /* exploit enhanced SIGA */ | |
1468 | q->u.out.use_enh_siga = 1; | |
d303b6fd | 1469 | rc = qdio_kick_outbound_q(q); |
7a0f4755 KDW |
1470 | } else { |
1471 | /* | |
1472 | * One siga-w per buffer required for unicast | |
1473 | * HiperSockets. | |
1474 | */ | |
1475 | q->u.out.use_enh_siga = 0; | |
d303b6fd JG |
1476 | while (count--) { |
1477 | rc = qdio_kick_outbound_q(q); | |
1478 | if (rc) | |
1479 | goto out; | |
1480 | } | |
7a0f4755 | 1481 | } |
779e6e1c JG |
1482 | goto out; |
1483 | } | |
1484 | ||
1485 | if (need_siga_sync(q)) { | |
1486 | qdio_siga_sync_q(q); | |
1487 | goto out; | |
1488 | } | |
1489 | ||
1490 | /* try to fast requeue buffers */ | |
50f769df | 1491 | get_buf_state(q, prev_buf(bufnr), &state, 0); |
779e6e1c | 1492 | if (state != SLSB_CU_OUTPUT_PRIMED) |
d303b6fd | 1493 | rc = qdio_kick_outbound_q(q); |
1d7e1500 | 1494 | else |
6486cda6 | 1495 | qperf_inc(q, fast_requeue); |
1d7e1500 | 1496 | |
779e6e1c | 1497 | out: |
3d6c76ff JG |
1498 | /* in case of SIGA errors we must process the error immediately */ |
1499 | if (used >= q->u.out.scan_threshold || rc) | |
1500 | tasklet_schedule(&q->tasklet); | |
1501 | else | |
1502 | /* free the SBALs in case of no further traffic */ | |
1503 | if (!timer_pending(&q->u.out.timer)) | |
1504 | mod_timer(&q->u.out.timer, jiffies + HZ); | |
d303b6fd | 1505 | return rc; |
779e6e1c JG |
1506 | } |
1507 | ||
1508 | /** | |
1509 | * do_QDIO - process input or output buffers | |
1510 | * @cdev: associated ccw_device for the qdio subchannel | |
1511 | * @callflags: input or output and special flags from the program | |
1512 | * @q_nr: queue number | |
1513 | * @bufnr: buffer number | |
1514 | * @count: how many buffers to process | |
1515 | */ | |
1516 | int do_QDIO(struct ccw_device *cdev, unsigned int callflags, | |
6618241b | 1517 | int q_nr, unsigned int bufnr, unsigned int count) |
779e6e1c JG |
1518 | { |
1519 | struct qdio_irq *irq_ptr; | |
779e6e1c | 1520 | |
6618241b | 1521 | if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q) |
779e6e1c JG |
1522 | return -EINVAL; |
1523 | ||
779e6e1c JG |
1524 | irq_ptr = cdev->private->qdio_data; |
1525 | if (!irq_ptr) | |
1526 | return -ENODEV; | |
1527 | ||
1d7e1500 JG |
1528 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, |
1529 | "do%02x b:%02x c:%02x", callflags, bufnr, count); | |
779e6e1c JG |
1530 | |
1531 | if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE) | |
1532 | return -EBUSY; | |
1533 | ||
1534 | if (callflags & QDIO_FLAG_SYNC_INPUT) | |
d303b6fd JG |
1535 | return handle_inbound(irq_ptr->input_qs[q_nr], |
1536 | callflags, bufnr, count); | |
779e6e1c | 1537 | else if (callflags & QDIO_FLAG_SYNC_OUTPUT) |
d303b6fd JG |
1538 | return handle_outbound(irq_ptr->output_qs[q_nr], |
1539 | callflags, bufnr, count); | |
1540 | return -EINVAL; | |
779e6e1c JG |
1541 | } |
1542 | EXPORT_SYMBOL_GPL(do_QDIO); | |
1543 | ||
d36deae7 JG |
1544 | /** |
1545 | * qdio_start_irq - process input buffers | |
1546 | * @cdev: associated ccw_device for the qdio subchannel | |
1547 | * @nr: input queue number | |
1548 | * | |
1549 | * Return codes | |
1550 | * 0 - success | |
1551 | * 1 - irqs not started since new data is available | |
1552 | */ | |
1553 | int qdio_start_irq(struct ccw_device *cdev, int nr) | |
1554 | { | |
1555 | struct qdio_q *q; | |
1556 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1557 | ||
1558 | if (!irq_ptr) | |
1559 | return -ENODEV; | |
1560 | q = irq_ptr->input_qs[nr]; | |
1561 | ||
1562 | WARN_ON(queue_irqs_enabled(q)); | |
1563 | ||
4f325184 | 1564 | if (!shared_ind(q->irq_ptr->dsci)) |
d36deae7 JG |
1565 | xchg(q->irq_ptr->dsci, 0); |
1566 | ||
1567 | qdio_stop_polling(q); | |
1568 | clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state); | |
1569 | ||
1570 | /* | |
1571 | * We need to check again to not lose initiative after | |
1572 | * resetting the ACK state. | |
1573 | */ | |
4f325184 | 1574 | if (!shared_ind(q->irq_ptr->dsci) && *q->irq_ptr->dsci) |
d36deae7 JG |
1575 | goto rescan; |
1576 | if (!qdio_inbound_q_done(q)) | |
1577 | goto rescan; | |
1578 | return 0; | |
1579 | ||
1580 | rescan: | |
1581 | if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, | |
1582 | &q->u.in.queue_irq_state)) | |
1583 | return 0; | |
1584 | else | |
1585 | return 1; | |
1586 | ||
1587 | } | |
1588 | EXPORT_SYMBOL(qdio_start_irq); | |
1589 | ||
1590 | /** | |
1591 | * qdio_get_next_buffers - process input buffers | |
1592 | * @cdev: associated ccw_device for the qdio subchannel | |
1593 | * @nr: input queue number | |
1594 | * @bufnr: first filled buffer number | |
1595 | * @error: buffers are in error state | |
1596 | * | |
1597 | * Return codes | |
1598 | * < 0 - error | |
1599 | * = 0 - no new buffers found | |
1600 | * > 0 - number of processed buffers | |
1601 | */ | |
1602 | int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr, | |
1603 | int *error) | |
1604 | { | |
1605 | struct qdio_q *q; | |
1606 | int start, end; | |
1607 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1608 | ||
1609 | if (!irq_ptr) | |
1610 | return -ENODEV; | |
1611 | q = irq_ptr->input_qs[nr]; | |
1612 | WARN_ON(queue_irqs_enabled(q)); | |
1613 | ||
1614 | qdio_sync_after_thinint(q); | |
1615 | ||
1616 | /* | |
1617 | * The interrupt could be caused by a PCI request. Check the | |
1618 | * PCI capable outbound queues. | |
1619 | */ | |
1620 | qdio_check_outbound_after_thinint(q); | |
1621 | ||
1622 | if (!qdio_inbound_q_moved(q)) | |
1623 | return 0; | |
1624 | ||
1625 | /* Note: upper-layer MUST stop processing immediately here ... */ | |
1626 | if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) | |
1627 | return -EIO; | |
1628 | ||
1629 | start = q->first_to_kick; | |
1630 | end = q->first_to_check; | |
1631 | *bufnr = start; | |
1632 | *error = q->qdio_error; | |
1633 | ||
1634 | /* for the next time */ | |
1635 | q->first_to_kick = end; | |
1636 | q->qdio_error = 0; | |
1637 | return sub_buf(end, start); | |
1638 | } | |
1639 | EXPORT_SYMBOL(qdio_get_next_buffers); | |
1640 | ||
1641 | /** | |
1642 | * qdio_stop_irq - disable interrupt processing for the device | |
1643 | * @cdev: associated ccw_device for the qdio subchannel | |
1644 | * @nr: input queue number | |
1645 | * | |
1646 | * Return codes | |
1647 | * 0 - interrupts were already disabled | |
1648 | * 1 - interrupts successfully disabled | |
1649 | */ | |
1650 | int qdio_stop_irq(struct ccw_device *cdev, int nr) | |
1651 | { | |
1652 | struct qdio_q *q; | |
1653 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1654 | ||
1655 | if (!irq_ptr) | |
1656 | return -ENODEV; | |
1657 | q = irq_ptr->input_qs[nr]; | |
1658 | ||
1659 | if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, | |
1660 | &q->u.in.queue_irq_state)) | |
1661 | return 0; | |
1662 | else | |
1663 | return 1; | |
1664 | } | |
1665 | EXPORT_SYMBOL(qdio_stop_irq); | |
1666 | ||
779e6e1c JG |
1667 | static int __init init_QDIO(void) |
1668 | { | |
1669 | int rc; | |
1670 | ||
1671 | rc = qdio_setup_init(); | |
1672 | if (rc) | |
1673 | return rc; | |
1674 | rc = tiqdio_allocate_memory(); | |
1675 | if (rc) | |
1676 | goto out_cache; | |
1677 | rc = qdio_debug_init(); | |
1678 | if (rc) | |
1679 | goto out_ti; | |
779e6e1c JG |
1680 | rc = tiqdio_register_thinints(); |
1681 | if (rc) | |
6486cda6 | 1682 | goto out_debug; |
779e6e1c JG |
1683 | return 0; |
1684 | ||
779e6e1c JG |
1685 | out_debug: |
1686 | qdio_debug_exit(); | |
1687 | out_ti: | |
1688 | tiqdio_free_memory(); | |
1689 | out_cache: | |
1690 | qdio_setup_exit(); | |
1691 | return rc; | |
1692 | } | |
1693 | ||
1694 | static void __exit exit_QDIO(void) | |
1695 | { | |
1696 | tiqdio_unregister_thinints(); | |
1697 | tiqdio_free_memory(); | |
779e6e1c JG |
1698 | qdio_debug_exit(); |
1699 | qdio_setup_exit(); | |
1700 | } | |
1701 | ||
1702 | module_init(init_QDIO); | |
1703 | module_exit(exit_QDIO); |