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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> |
60063497 | 18 | #include <linux/atomic.h> |
779e6e1c JG |
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 | ||
7a0b4cbc | 289 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr); |
6486cda6 | 290 | qperf_inc(q, siga_sync); |
779e6e1c | 291 | |
958c0ba4 JG |
292 | if (is_qebsm(q)) { |
293 | schid = q->irq_ptr->sch_token; | |
294 | fc |= QDIO_SIGA_QEBSM_FLAG; | |
295 | } | |
296 | ||
297 | cc = do_siga_sync(schid, output, input, fc); | |
110da317 | 298 | if (unlikely(cc)) |
22f99347 | 299 | DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc); |
779e6e1c JG |
300 | return cc; |
301 | } | |
302 | ||
60b5df2f | 303 | static inline int qdio_siga_sync_q(struct qdio_q *q) |
779e6e1c JG |
304 | { |
305 | if (q->is_input_q) | |
306 | return qdio_siga_sync(q, 0, q->mask); | |
307 | else | |
308 | return qdio_siga_sync(q, q->mask, 0); | |
309 | } | |
310 | ||
7a0b4cbc | 311 | static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit) |
779e6e1c | 312 | { |
958c0ba4 JG |
313 | unsigned long schid = *((u32 *) &q->irq_ptr->schid); |
314 | unsigned int fc = QDIO_SIGA_WRITE; | |
7a0b4cbc | 315 | u64 start_time = 0; |
be8d97a5 | 316 | int retries = 0, cc; |
779e6e1c | 317 | |
7a0b4cbc | 318 | if (is_qebsm(q)) { |
779e6e1c | 319 | schid = q->irq_ptr->sch_token; |
958c0ba4 | 320 | fc |= QDIO_SIGA_QEBSM_FLAG; |
779e6e1c | 321 | } |
779e6e1c | 322 | again: |
7a0b4cbc JG |
323 | cc = do_siga_output(schid, q->mask, busy_bit, fc); |
324 | ||
325 | /* hipersocket busy condition */ | |
110da317 | 326 | if (unlikely(*busy_bit)) { |
7a0b4cbc | 327 | WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2); |
be8d97a5 | 328 | retries++; |
58eb27cd | 329 | |
7a0b4cbc | 330 | if (!start_time) { |
3a601bfe | 331 | start_time = get_clock(); |
7a0b4cbc JG |
332 | goto again; |
333 | } | |
3a601bfe | 334 | if ((get_clock() - start_time) < QDIO_BUSY_BIT_PATIENCE) |
779e6e1c JG |
335 | goto again; |
336 | } | |
be8d97a5 JG |
337 | if (retries) { |
338 | DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, | |
339 | "%4x cc2 BB1:%1d", SCH_NO(q), q->nr); | |
340 | DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries); | |
341 | } | |
779e6e1c JG |
342 | return cc; |
343 | } | |
344 | ||
345 | static inline int qdio_siga_input(struct qdio_q *q) | |
346 | { | |
958c0ba4 JG |
347 | unsigned long schid = *((u32 *) &q->irq_ptr->schid); |
348 | unsigned int fc = QDIO_SIGA_READ; | |
779e6e1c JG |
349 | int cc; |
350 | ||
22f99347 | 351 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr); |
6486cda6 | 352 | qperf_inc(q, siga_read); |
779e6e1c | 353 | |
958c0ba4 JG |
354 | if (is_qebsm(q)) { |
355 | schid = q->irq_ptr->sch_token; | |
356 | fc |= QDIO_SIGA_QEBSM_FLAG; | |
357 | } | |
358 | ||
359 | cc = do_siga_input(schid, q->mask, fc); | |
110da317 | 360 | if (unlikely(cc)) |
22f99347 | 361 | DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc); |
779e6e1c JG |
362 | return cc; |
363 | } | |
364 | ||
90adac58 JG |
365 | #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0) |
366 | #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U) | |
367 | ||
368 | static inline void qdio_sync_queues(struct qdio_q *q) | |
779e6e1c | 369 | { |
90adac58 JG |
370 | /* PCI capable outbound queues will also be scanned so sync them too */ |
371 | if (pci_out_supported(q)) | |
372 | qdio_siga_sync_all(q); | |
373 | else | |
779e6e1c JG |
374 | qdio_siga_sync_q(q); |
375 | } | |
376 | ||
60b5df2f JG |
377 | int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr, |
378 | unsigned char *state) | |
379 | { | |
90adac58 JG |
380 | if (need_siga_sync(q)) |
381 | qdio_siga_sync_q(q); | |
60b5df2f JG |
382 | return get_buf_states(q, bufnr, state, 1, 0); |
383 | } | |
384 | ||
385 | static inline void qdio_stop_polling(struct qdio_q *q) | |
779e6e1c | 386 | { |
50f769df | 387 | if (!q->u.in.polling) |
779e6e1c | 388 | return; |
50f769df | 389 | |
779e6e1c | 390 | q->u.in.polling = 0; |
6486cda6 | 391 | qperf_inc(q, stop_polling); |
779e6e1c JG |
392 | |
393 | /* show the card that we are not polling anymore */ | |
50f769df | 394 | if (is_qebsm(q)) { |
e85dea0e | 395 | set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, |
50f769df JG |
396 | q->u.in.ack_count); |
397 | q->u.in.ack_count = 0; | |
398 | } else | |
e85dea0e | 399 | set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); |
779e6e1c JG |
400 | } |
401 | ||
d307297f JG |
402 | static inline void account_sbals(struct qdio_q *q, int count) |
403 | { | |
404 | int pos = 0; | |
405 | ||
406 | q->q_stats.nr_sbal_total += count; | |
407 | if (count == QDIO_MAX_BUFFERS_MASK) { | |
408 | q->q_stats.nr_sbals[7]++; | |
409 | return; | |
410 | } | |
411 | while (count >>= 1) | |
412 | pos++; | |
413 | q->q_stats.nr_sbals[pos]++; | |
414 | } | |
415 | ||
bffbbd2d | 416 | static void process_buffer_error(struct qdio_q *q, int count) |
779e6e1c | 417 | { |
bffbbd2d JG |
418 | unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT : |
419 | SLSB_P_OUTPUT_NOT_INIT; | |
420 | ||
7a0b4cbc | 421 | q->qdio_error |= QDIO_ERROR_SLSB_STATE; |
50f769df JG |
422 | |
423 | /* special handling for no target buffer empty */ | |
424 | if ((!q->is_input_q && | |
3ec90878 | 425 | (q->sbal[q->first_to_check]->element[15].sflags) == 0x10)) { |
6486cda6 | 426 | qperf_inc(q, target_full); |
1d7e1500 | 427 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", |
50f769df JG |
428 | q->first_to_check); |
429 | return; | |
430 | } | |
431 | ||
22f99347 JG |
432 | DBF_ERROR("%4x BUF ERROR", SCH_NO(q)); |
433 | DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr); | |
50f769df | 434 | DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count); |
22f99347 | 435 | DBF_ERROR("F14:%2x F15:%2x", |
3ec90878 JG |
436 | q->sbal[q->first_to_check]->element[14].sflags, |
437 | q->sbal[q->first_to_check]->element[15].sflags); | |
bffbbd2d JG |
438 | |
439 | /* | |
440 | * Interrupts may be avoided as long as the error is present | |
441 | * so change the buffer state immediately to avoid starvation. | |
442 | */ | |
443 | set_buf_states(q, q->first_to_check, state, count); | |
50f769df | 444 | } |
779e6e1c | 445 | |
50f769df JG |
446 | static inline void inbound_primed(struct qdio_q *q, int count) |
447 | { | |
448 | int new; | |
449 | ||
1d7e1500 | 450 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count); |
50f769df JG |
451 | |
452 | /* for QEBSM the ACK was already set by EQBS */ | |
453 | if (is_qebsm(q)) { | |
454 | if (!q->u.in.polling) { | |
455 | q->u.in.polling = 1; | |
456 | q->u.in.ack_count = count; | |
e85dea0e | 457 | q->u.in.ack_start = q->first_to_check; |
50f769df JG |
458 | return; |
459 | } | |
460 | ||
461 | /* delete the previous ACK's */ | |
e85dea0e | 462 | set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, |
50f769df JG |
463 | q->u.in.ack_count); |
464 | q->u.in.ack_count = count; | |
e85dea0e | 465 | q->u.in.ack_start = q->first_to_check; |
50f769df JG |
466 | return; |
467 | } | |
468 | ||
469 | /* | |
470 | * ACK the newest buffer. The ACK will be removed in qdio_stop_polling | |
471 | * or by the next inbound run. | |
472 | */ | |
473 | new = add_buf(q->first_to_check, count - 1); | |
474 | if (q->u.in.polling) { | |
475 | /* reset the previous ACK but first set the new one */ | |
476 | set_buf_state(q, new, SLSB_P_INPUT_ACK); | |
e85dea0e | 477 | set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); |
3fdf1e18 | 478 | } else { |
50f769df | 479 | q->u.in.polling = 1; |
3fdf1e18 | 480 | set_buf_state(q, new, SLSB_P_INPUT_ACK); |
50f769df JG |
481 | } |
482 | ||
e85dea0e | 483 | q->u.in.ack_start = new; |
50f769df JG |
484 | count--; |
485 | if (!count) | |
486 | return; | |
6541f7b6 JG |
487 | /* need to change ALL buffers to get more interrupts */ |
488 | set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count); | |
779e6e1c JG |
489 | } |
490 | ||
491 | static int get_inbound_buffer_frontier(struct qdio_q *q) | |
492 | { | |
493 | int count, stop; | |
6fa1098a | 494 | unsigned char state = 0; |
779e6e1c | 495 | |
779e6e1c JG |
496 | /* |
497 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved | |
498 | * would return 0. | |
499 | */ | |
500 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); | |
501 | stop = add_buf(q->first_to_check, count); | |
502 | ||
779e6e1c JG |
503 | if (q->first_to_check == stop) |
504 | goto out; | |
505 | ||
36e3e721 JG |
506 | /* |
507 | * No siga sync here, as a PCI or we after a thin interrupt | |
508 | * already sync'ed the queues. | |
509 | */ | |
50f769df | 510 | count = get_buf_states(q, q->first_to_check, &state, count, 1); |
779e6e1c JG |
511 | if (!count) |
512 | goto out; | |
513 | ||
514 | switch (state) { | |
515 | case SLSB_P_INPUT_PRIMED: | |
50f769df | 516 | inbound_primed(q, count); |
779e6e1c | 517 | q->first_to_check = add_buf(q->first_to_check, count); |
8bcd9b04 | 518 | if (atomic_sub(count, &q->nr_buf_used) == 0) |
6486cda6 | 519 | qperf_inc(q, inbound_queue_full); |
d307297f JG |
520 | if (q->irq_ptr->perf_stat_enabled) |
521 | account_sbals(q, count); | |
36e3e721 | 522 | break; |
779e6e1c | 523 | case SLSB_P_INPUT_ERROR: |
bffbbd2d | 524 | process_buffer_error(q, count); |
779e6e1c JG |
525 | q->first_to_check = add_buf(q->first_to_check, count); |
526 | atomic_sub(count, &q->nr_buf_used); | |
d307297f JG |
527 | if (q->irq_ptr->perf_stat_enabled) |
528 | account_sbals_error(q, count); | |
779e6e1c JG |
529 | break; |
530 | case SLSB_CU_INPUT_EMPTY: | |
531 | case SLSB_P_INPUT_NOT_INIT: | |
532 | case SLSB_P_INPUT_ACK: | |
d307297f JG |
533 | if (q->irq_ptr->perf_stat_enabled) |
534 | q->q_stats.nr_sbal_nop++; | |
22f99347 | 535 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop"); |
779e6e1c JG |
536 | break; |
537 | default: | |
538 | BUG(); | |
539 | } | |
540 | out: | |
779e6e1c JG |
541 | return q->first_to_check; |
542 | } | |
543 | ||
60b5df2f | 544 | static int qdio_inbound_q_moved(struct qdio_q *q) |
779e6e1c JG |
545 | { |
546 | int bufnr; | |
547 | ||
548 | bufnr = get_inbound_buffer_frontier(q); | |
549 | ||
e85dea0e JG |
550 | if ((bufnr != q->last_move) || q->qdio_error) { |
551 | q->last_move = bufnr; | |
27d71602 | 552 | if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR) |
3a601bfe | 553 | q->u.in.timestamp = get_clock(); |
779e6e1c JG |
554 | return 1; |
555 | } else | |
556 | return 0; | |
557 | } | |
558 | ||
9a2c160a | 559 | static inline int qdio_inbound_q_done(struct qdio_q *q) |
779e6e1c | 560 | { |
9a1ce28a | 561 | unsigned char state = 0; |
779e6e1c JG |
562 | |
563 | if (!atomic_read(&q->nr_buf_used)) | |
564 | return 1; | |
565 | ||
90adac58 JG |
566 | if (need_siga_sync(q)) |
567 | qdio_siga_sync_q(q); | |
50f769df | 568 | get_buf_state(q, q->first_to_check, &state, 0); |
9a2c160a | 569 | |
4c52228d | 570 | if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR) |
9a2c160a | 571 | /* more work coming */ |
779e6e1c JG |
572 | return 0; |
573 | ||
9a2c160a JG |
574 | if (is_thinint_irq(q->irq_ptr)) |
575 | return 1; | |
576 | ||
577 | /* don't poll under z/VM */ | |
578 | if (MACHINE_IS_VM) | |
779e6e1c JG |
579 | return 1; |
580 | ||
581 | /* | |
582 | * At this point we know, that inbound first_to_check | |
583 | * has (probably) not moved (see qdio_inbound_processing). | |
584 | */ | |
3a601bfe | 585 | if (get_clock() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) { |
1d7e1500 | 586 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x", |
22f99347 | 587 | q->first_to_check); |
779e6e1c | 588 | return 1; |
9a2c160a | 589 | } else |
60b5df2f | 590 | return 0; |
60b5df2f JG |
591 | } |
592 | ||
593 | static void qdio_kick_handler(struct qdio_q *q) | |
779e6e1c | 594 | { |
9c8a08d7 JG |
595 | int start = q->first_to_kick; |
596 | int end = q->first_to_check; | |
597 | int count; | |
779e6e1c JG |
598 | |
599 | if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) | |
600 | return; | |
601 | ||
9c8a08d7 JG |
602 | count = sub_buf(end, start); |
603 | ||
604 | if (q->is_input_q) { | |
6486cda6 | 605 | qperf_inc(q, inbound_handler); |
1d7e1500 | 606 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count); |
bd6e8a16 | 607 | } else { |
6486cda6 | 608 | qperf_inc(q, outbound_handler); |
1d7e1500 JG |
609 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x", |
610 | start, count); | |
bd6e8a16 | 611 | } |
9c8a08d7 JG |
612 | |
613 | q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count, | |
614 | q->irq_ptr->int_parm); | |
779e6e1c JG |
615 | |
616 | /* for the next time */ | |
9c8a08d7 | 617 | q->first_to_kick = end; |
779e6e1c JG |
618 | q->qdio_error = 0; |
619 | } | |
620 | ||
621 | static void __qdio_inbound_processing(struct qdio_q *q) | |
622 | { | |
6486cda6 | 623 | qperf_inc(q, tasklet_inbound); |
f3eb20fa | 624 | |
779e6e1c JG |
625 | if (!qdio_inbound_q_moved(q)) |
626 | return; | |
627 | ||
9c8a08d7 | 628 | qdio_kick_handler(q); |
779e6e1c | 629 | |
6486cda6 | 630 | if (!qdio_inbound_q_done(q)) { |
779e6e1c | 631 | /* means poll time is not yet over */ |
6486cda6 | 632 | qperf_inc(q, tasklet_inbound_resched); |
f3eb20fa JG |
633 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) { |
634 | tasklet_schedule(&q->tasklet); | |
635 | return; | |
636 | } | |
6486cda6 | 637 | } |
779e6e1c JG |
638 | |
639 | qdio_stop_polling(q); | |
640 | /* | |
641 | * We need to check again to not lose initiative after | |
642 | * resetting the ACK state. | |
643 | */ | |
6486cda6 JG |
644 | if (!qdio_inbound_q_done(q)) { |
645 | qperf_inc(q, tasklet_inbound_resched2); | |
f3eb20fa JG |
646 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) |
647 | tasklet_schedule(&q->tasklet); | |
6486cda6 | 648 | } |
779e6e1c JG |
649 | } |
650 | ||
779e6e1c JG |
651 | void qdio_inbound_processing(unsigned long data) |
652 | { | |
653 | struct qdio_q *q = (struct qdio_q *)data; | |
654 | __qdio_inbound_processing(q); | |
655 | } | |
656 | ||
657 | static int get_outbound_buffer_frontier(struct qdio_q *q) | |
658 | { | |
659 | int count, stop; | |
6fa1098a | 660 | unsigned char state = 0; |
779e6e1c | 661 | |
90adac58 JG |
662 | if (need_siga_sync(q)) |
663 | if (((queue_type(q) != QDIO_IQDIO_QFMT) && | |
664 | !pci_out_supported(q)) || | |
665 | (queue_type(q) == QDIO_IQDIO_QFMT && | |
666 | multicast_outbound(q))) | |
667 | qdio_siga_sync_q(q); | |
779e6e1c JG |
668 | |
669 | /* | |
670 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved | |
671 | * would return 0. | |
672 | */ | |
673 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); | |
674 | stop = add_buf(q->first_to_check, count); | |
675 | ||
779e6e1c JG |
676 | if (q->first_to_check == stop) |
677 | return q->first_to_check; | |
678 | ||
50f769df | 679 | count = get_buf_states(q, q->first_to_check, &state, count, 0); |
779e6e1c JG |
680 | if (!count) |
681 | return q->first_to_check; | |
682 | ||
683 | switch (state) { | |
684 | case SLSB_P_OUTPUT_EMPTY: | |
685 | /* the adapter got it */ | |
1d7e1500 | 686 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %02x", q->nr, count); |
779e6e1c JG |
687 | |
688 | atomic_sub(count, &q->nr_buf_used); | |
689 | q->first_to_check = add_buf(q->first_to_check, count); | |
d307297f JG |
690 | if (q->irq_ptr->perf_stat_enabled) |
691 | account_sbals(q, count); | |
36e3e721 | 692 | break; |
779e6e1c | 693 | case SLSB_P_OUTPUT_ERROR: |
bffbbd2d | 694 | process_buffer_error(q, count); |
779e6e1c JG |
695 | q->first_to_check = add_buf(q->first_to_check, count); |
696 | atomic_sub(count, &q->nr_buf_used); | |
d307297f JG |
697 | if (q->irq_ptr->perf_stat_enabled) |
698 | account_sbals_error(q, count); | |
779e6e1c JG |
699 | break; |
700 | case SLSB_CU_OUTPUT_PRIMED: | |
701 | /* the adapter has not fetched the output yet */ | |
d307297f JG |
702 | if (q->irq_ptr->perf_stat_enabled) |
703 | q->q_stats.nr_sbal_nop++; | |
22f99347 | 704 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr); |
779e6e1c JG |
705 | break; |
706 | case SLSB_P_OUTPUT_NOT_INIT: | |
707 | case SLSB_P_OUTPUT_HALTED: | |
708 | break; | |
709 | default: | |
710 | BUG(); | |
711 | } | |
712 | return q->first_to_check; | |
713 | } | |
714 | ||
715 | /* all buffers processed? */ | |
716 | static inline int qdio_outbound_q_done(struct qdio_q *q) | |
717 | { | |
718 | return atomic_read(&q->nr_buf_used) == 0; | |
719 | } | |
720 | ||
721 | static inline int qdio_outbound_q_moved(struct qdio_q *q) | |
722 | { | |
723 | int bufnr; | |
724 | ||
725 | bufnr = get_outbound_buffer_frontier(q); | |
726 | ||
e85dea0e JG |
727 | if ((bufnr != q->last_move) || q->qdio_error) { |
728 | q->last_move = bufnr; | |
22f99347 | 729 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr); |
779e6e1c JG |
730 | return 1; |
731 | } else | |
732 | return 0; | |
733 | } | |
734 | ||
d303b6fd | 735 | static int qdio_kick_outbound_q(struct qdio_q *q) |
779e6e1c | 736 | { |
be8d97a5 | 737 | int retries = 0, cc; |
7a0b4cbc | 738 | unsigned int busy_bit; |
779e6e1c JG |
739 | |
740 | if (!need_siga_out(q)) | |
d303b6fd | 741 | return 0; |
779e6e1c | 742 | |
7a0b4cbc | 743 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr); |
be8d97a5 | 744 | retry: |
6486cda6 | 745 | qperf_inc(q, siga_write); |
7a0b4cbc JG |
746 | |
747 | cc = qdio_siga_output(q, &busy_bit); | |
748 | switch (cc) { | |
779e6e1c | 749 | case 0: |
779e6e1c | 750 | break; |
7a0b4cbc JG |
751 | case 2: |
752 | if (busy_bit) { | |
be8d97a5 JG |
753 | while (++retries < QDIO_BUSY_BIT_RETRIES) { |
754 | mdelay(QDIO_BUSY_BIT_RETRY_DELAY); | |
755 | goto retry; | |
756 | } | |
757 | DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr); | |
d303b6fd JG |
758 | cc |= QDIO_ERROR_SIGA_BUSY; |
759 | } else | |
760 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr); | |
7a0b4cbc JG |
761 | break; |
762 | case 1: | |
763 | case 3: | |
764 | DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc); | |
7a0b4cbc | 765 | break; |
779e6e1c | 766 | } |
be8d97a5 JG |
767 | if (retries) { |
768 | DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr); | |
769 | DBF_ERROR("count:%u", retries); | |
770 | } | |
d303b6fd | 771 | return cc; |
779e6e1c JG |
772 | } |
773 | ||
779e6e1c JG |
774 | static void __qdio_outbound_processing(struct qdio_q *q) |
775 | { | |
6486cda6 | 776 | qperf_inc(q, tasklet_outbound); |
779e6e1c JG |
777 | BUG_ON(atomic_read(&q->nr_buf_used) < 0); |
778 | ||
779 | if (qdio_outbound_q_moved(q)) | |
9c8a08d7 | 780 | qdio_kick_handler(q); |
779e6e1c | 781 | |
c38f9608 | 782 | if (queue_type(q) == QDIO_ZFCP_QFMT) |
779e6e1c | 783 | if (!pci_out_supported(q) && !qdio_outbound_q_done(q)) |
c38f9608 | 784 | goto sched; |
779e6e1c JG |
785 | |
786 | /* bail out for HiperSockets unicast queues */ | |
787 | if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q)) | |
788 | return; | |
789 | ||
4bcb3a37 | 790 | if ((queue_type(q) == QDIO_IQDIO_QFMT) && |
c38f9608 JG |
791 | (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL) |
792 | goto sched; | |
4bcb3a37 | 793 | |
779e6e1c JG |
794 | if (q->u.out.pci_out_enabled) |
795 | return; | |
796 | ||
797 | /* | |
798 | * Now we know that queue type is either qeth without pci enabled | |
799 | * or HiperSockets multicast. Make sure buffer switch from PRIMED to | |
800 | * EMPTY is noticed and outbound_handler is called after some time. | |
801 | */ | |
802 | if (qdio_outbound_q_done(q)) | |
803 | del_timer(&q->u.out.timer); | |
6486cda6 JG |
804 | else |
805 | if (!timer_pending(&q->u.out.timer)) | |
779e6e1c | 806 | mod_timer(&q->u.out.timer, jiffies + 10 * HZ); |
c38f9608 JG |
807 | return; |
808 | ||
809 | sched: | |
810 | if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) | |
811 | return; | |
812 | tasklet_schedule(&q->tasklet); | |
779e6e1c JG |
813 | } |
814 | ||
815 | /* outbound tasklet */ | |
816 | void qdio_outbound_processing(unsigned long data) | |
817 | { | |
818 | struct qdio_q *q = (struct qdio_q *)data; | |
819 | __qdio_outbound_processing(q); | |
820 | } | |
821 | ||
822 | void qdio_outbound_timer(unsigned long data) | |
823 | { | |
824 | struct qdio_q *q = (struct qdio_q *)data; | |
c38f9608 JG |
825 | |
826 | if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) | |
827 | return; | |
779e6e1c JG |
828 | tasklet_schedule(&q->tasklet); |
829 | } | |
830 | ||
60b5df2f | 831 | static inline void qdio_check_outbound_after_thinint(struct qdio_q *q) |
779e6e1c JG |
832 | { |
833 | struct qdio_q *out; | |
834 | int i; | |
835 | ||
836 | if (!pci_out_supported(q)) | |
837 | return; | |
838 | ||
839 | for_each_output_queue(q->irq_ptr, out, i) | |
840 | if (!qdio_outbound_q_done(out)) | |
841 | tasklet_schedule(&out->tasklet); | |
842 | } | |
843 | ||
60b5df2f JG |
844 | static void __tiqdio_inbound_processing(struct qdio_q *q) |
845 | { | |
6486cda6 | 846 | qperf_inc(q, tasklet_inbound); |
90adac58 JG |
847 | if (need_siga_sync(q) && need_siga_sync_after_ai(q)) |
848 | qdio_sync_queues(q); | |
60b5df2f JG |
849 | |
850 | /* | |
851 | * The interrupt could be caused by a PCI request. Check the | |
852 | * PCI capable outbound queues. | |
853 | */ | |
854 | qdio_check_outbound_after_thinint(q); | |
855 | ||
856 | if (!qdio_inbound_q_moved(q)) | |
857 | return; | |
858 | ||
859 | qdio_kick_handler(q); | |
860 | ||
9a2c160a | 861 | if (!qdio_inbound_q_done(q)) { |
6486cda6 | 862 | qperf_inc(q, tasklet_inbound_resched); |
e2910bcf | 863 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) { |
60b5df2f | 864 | tasklet_schedule(&q->tasklet); |
e2910bcf JG |
865 | return; |
866 | } | |
60b5df2f JG |
867 | } |
868 | ||
869 | qdio_stop_polling(q); | |
870 | /* | |
871 | * We need to check again to not lose initiative after | |
872 | * resetting the ACK state. | |
873 | */ | |
9a2c160a | 874 | if (!qdio_inbound_q_done(q)) { |
6486cda6 | 875 | qperf_inc(q, tasklet_inbound_resched2); |
60b5df2f JG |
876 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) |
877 | tasklet_schedule(&q->tasklet); | |
878 | } | |
879 | } | |
880 | ||
881 | void tiqdio_inbound_processing(unsigned long data) | |
882 | { | |
883 | struct qdio_q *q = (struct qdio_q *)data; | |
884 | __tiqdio_inbound_processing(q); | |
885 | } | |
886 | ||
779e6e1c JG |
887 | static inline void qdio_set_state(struct qdio_irq *irq_ptr, |
888 | enum qdio_irq_states state) | |
889 | { | |
22f99347 | 890 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state); |
779e6e1c JG |
891 | |
892 | irq_ptr->state = state; | |
893 | mb(); | |
894 | } | |
895 | ||
22f99347 | 896 | static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb) |
779e6e1c | 897 | { |
779e6e1c | 898 | if (irb->esw.esw0.erw.cons) { |
22f99347 JG |
899 | DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no); |
900 | DBF_ERROR_HEX(irb, 64); | |
901 | DBF_ERROR_HEX(irb->ecw, 64); | |
779e6e1c JG |
902 | } |
903 | } | |
904 | ||
905 | /* PCI interrupt handler */ | |
906 | static void qdio_int_handler_pci(struct qdio_irq *irq_ptr) | |
907 | { | |
908 | int i; | |
909 | struct qdio_q *q; | |
910 | ||
c38f9608 JG |
911 | if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) |
912 | return; | |
913 | ||
d36deae7 JG |
914 | for_each_input_queue(irq_ptr, q, i) { |
915 | if (q->u.in.queue_start_poll) { | |
916 | /* skip if polling is enabled or already in work */ | |
917 | if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, | |
918 | &q->u.in.queue_irq_state)) { | |
919 | qperf_inc(q, int_discarded); | |
920 | continue; | |
921 | } | |
922 | q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr, | |
923 | q->irq_ptr->int_parm); | |
924 | } else | |
925 | tasklet_schedule(&q->tasklet); | |
926 | } | |
779e6e1c | 927 | |
90adac58 | 928 | if (!pci_out_supported(q)) |
779e6e1c JG |
929 | return; |
930 | ||
931 | for_each_output_queue(irq_ptr, q, i) { | |
932 | if (qdio_outbound_q_done(q)) | |
933 | continue; | |
90adac58 | 934 | if (need_siga_sync(q) && need_siga_sync_out_after_pci(q)) |
779e6e1c | 935 | qdio_siga_sync_q(q); |
779e6e1c JG |
936 | tasklet_schedule(&q->tasklet); |
937 | } | |
938 | } | |
939 | ||
940 | static void qdio_handle_activate_check(struct ccw_device *cdev, | |
941 | unsigned long intparm, int cstat, int dstat) | |
942 | { | |
943 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
944 | struct qdio_q *q; | |
779e6e1c | 945 | |
22f99347 JG |
946 | DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no); |
947 | DBF_ERROR("intp :%lx", intparm); | |
948 | DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); | |
779e6e1c JG |
949 | |
950 | if (irq_ptr->nr_input_qs) { | |
951 | q = irq_ptr->input_qs[0]; | |
952 | } else if (irq_ptr->nr_output_qs) { | |
953 | q = irq_ptr->output_qs[0]; | |
954 | } else { | |
955 | dump_stack(); | |
956 | goto no_handler; | |
957 | } | |
958 | q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION, | |
959 | 0, -1, -1, irq_ptr->int_parm); | |
960 | no_handler: | |
961 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); | |
962 | } | |
963 | ||
4c575423 JG |
964 | static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat, |
965 | int dstat) | |
779e6e1c JG |
966 | { |
967 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
968 | ||
4c575423 | 969 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq"); |
779e6e1c | 970 | |
4c575423 | 971 | if (cstat) |
779e6e1c | 972 | goto error; |
4c575423 | 973 | if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END)) |
779e6e1c | 974 | goto error; |
4c575423 JG |
975 | if (!(dstat & DEV_STAT_DEV_END)) |
976 | goto error; | |
977 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED); | |
978 | return; | |
979 | ||
779e6e1c | 980 | error: |
22f99347 JG |
981 | DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no); |
982 | DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); | |
779e6e1c | 983 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); |
779e6e1c JG |
984 | } |
985 | ||
986 | /* qdio interrupt handler */ | |
987 | void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm, | |
988 | struct irb *irb) | |
989 | { | |
990 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
991 | int cstat, dstat; | |
779e6e1c | 992 | |
779e6e1c | 993 | if (!intparm || !irq_ptr) { |
22f99347 | 994 | DBF_ERROR("qint:%4x", cdev->private->schid.sch_no); |
779e6e1c JG |
995 | return; |
996 | } | |
997 | ||
30d77c3e | 998 | kstat_cpu(smp_processor_id()).irqs[IOINT_QDI]++; |
09a308f3 JG |
999 | if (irq_ptr->perf_stat_enabled) |
1000 | irq_ptr->perf_stat.qdio_int++; | |
1001 | ||
779e6e1c JG |
1002 | if (IS_ERR(irb)) { |
1003 | switch (PTR_ERR(irb)) { | |
1004 | case -EIO: | |
22f99347 | 1005 | DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no); |
75cb71f3 JG |
1006 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); |
1007 | wake_up(&cdev->private->wait_q); | |
779e6e1c JG |
1008 | return; |
1009 | default: | |
1010 | WARN_ON(1); | |
1011 | return; | |
1012 | } | |
1013 | } | |
22f99347 | 1014 | qdio_irq_check_sense(irq_ptr, irb); |
779e6e1c JG |
1015 | cstat = irb->scsw.cmd.cstat; |
1016 | dstat = irb->scsw.cmd.dstat; | |
1017 | ||
1018 | switch (irq_ptr->state) { | |
1019 | case QDIO_IRQ_STATE_INACTIVE: | |
1020 | qdio_establish_handle_irq(cdev, cstat, dstat); | |
1021 | break; | |
779e6e1c JG |
1022 | case QDIO_IRQ_STATE_CLEANUP: |
1023 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1024 | break; | |
779e6e1c JG |
1025 | case QDIO_IRQ_STATE_ESTABLISHED: |
1026 | case QDIO_IRQ_STATE_ACTIVE: | |
1027 | if (cstat & SCHN_STAT_PCI) { | |
1028 | qdio_int_handler_pci(irq_ptr); | |
779e6e1c JG |
1029 | return; |
1030 | } | |
4c575423 | 1031 | if (cstat || dstat) |
779e6e1c JG |
1032 | qdio_handle_activate_check(cdev, intparm, cstat, |
1033 | dstat); | |
4c575423 | 1034 | break; |
959153d3 JG |
1035 | case QDIO_IRQ_STATE_STOPPED: |
1036 | break; | |
779e6e1c JG |
1037 | default: |
1038 | WARN_ON(1); | |
1039 | } | |
1040 | wake_up(&cdev->private->wait_q); | |
1041 | } | |
1042 | ||
1043 | /** | |
1044 | * qdio_get_ssqd_desc - get qdio subchannel description | |
1045 | * @cdev: ccw device to get description for | |
bbd50e17 | 1046 | * @data: where to store the ssqd |
779e6e1c | 1047 | * |
bbd50e17 JG |
1048 | * Returns 0 or an error code. The results of the chsc are stored in the |
1049 | * specified structure. | |
779e6e1c | 1050 | */ |
bbd50e17 JG |
1051 | int qdio_get_ssqd_desc(struct ccw_device *cdev, |
1052 | struct qdio_ssqd_desc *data) | |
779e6e1c | 1053 | { |
779e6e1c | 1054 | |
bbd50e17 JG |
1055 | if (!cdev || !cdev->private) |
1056 | return -EINVAL; | |
1057 | ||
22f99347 | 1058 | DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no); |
bbd50e17 | 1059 | return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data); |
779e6e1c JG |
1060 | } |
1061 | EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc); | |
1062 | ||
779e6e1c JG |
1063 | static void qdio_shutdown_queues(struct ccw_device *cdev) |
1064 | { | |
1065 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1066 | struct qdio_q *q; | |
1067 | int i; | |
1068 | ||
1069 | for_each_input_queue(irq_ptr, q, i) | |
c38f9608 | 1070 | tasklet_kill(&q->tasklet); |
779e6e1c JG |
1071 | |
1072 | for_each_output_queue(irq_ptr, q, i) { | |
779e6e1c | 1073 | del_timer(&q->u.out.timer); |
c38f9608 | 1074 | tasklet_kill(&q->tasklet); |
779e6e1c JG |
1075 | } |
1076 | } | |
1077 | ||
1078 | /** | |
1079 | * qdio_shutdown - shut down a qdio subchannel | |
1080 | * @cdev: associated ccw device | |
1081 | * @how: use halt or clear to shutdown | |
1082 | */ | |
1083 | int qdio_shutdown(struct ccw_device *cdev, int how) | |
1084 | { | |
22f99347 | 1085 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
779e6e1c JG |
1086 | int rc; |
1087 | unsigned long flags; | |
779e6e1c | 1088 | |
779e6e1c JG |
1089 | if (!irq_ptr) |
1090 | return -ENODEV; | |
1091 | ||
b4547402 | 1092 | BUG_ON(irqs_disabled()); |
22f99347 JG |
1093 | DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no); |
1094 | ||
779e6e1c JG |
1095 | mutex_lock(&irq_ptr->setup_mutex); |
1096 | /* | |
1097 | * Subchannel was already shot down. We cannot prevent being called | |
1098 | * twice since cio may trigger a shutdown asynchronously. | |
1099 | */ | |
1100 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { | |
1101 | mutex_unlock(&irq_ptr->setup_mutex); | |
1102 | return 0; | |
1103 | } | |
1104 | ||
c38f9608 JG |
1105 | /* |
1106 | * Indicate that the device is going down. Scheduling the queue | |
1107 | * tasklets is forbidden from here on. | |
1108 | */ | |
1109 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); | |
1110 | ||
779e6e1c JG |
1111 | tiqdio_remove_input_queues(irq_ptr); |
1112 | qdio_shutdown_queues(cdev); | |
1113 | qdio_shutdown_debug_entries(irq_ptr, cdev); | |
1114 | ||
1115 | /* cleanup subchannel */ | |
1116 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1117 | ||
1118 | if (how & QDIO_FLAG_CLEANUP_USING_CLEAR) | |
1119 | rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP); | |
1120 | else | |
1121 | /* default behaviour is halt */ | |
1122 | rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP); | |
1123 | if (rc) { | |
22f99347 JG |
1124 | DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no); |
1125 | DBF_ERROR("rc:%4d", rc); | |
779e6e1c JG |
1126 | goto no_cleanup; |
1127 | } | |
1128 | ||
1129 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP); | |
1130 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1131 | wait_event_interruptible_timeout(cdev->private->wait_q, | |
1132 | irq_ptr->state == QDIO_IRQ_STATE_INACTIVE || | |
1133 | irq_ptr->state == QDIO_IRQ_STATE_ERR, | |
1134 | 10 * HZ); | |
1135 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1136 | ||
1137 | no_cleanup: | |
1138 | qdio_shutdown_thinint(irq_ptr); | |
1139 | ||
1140 | /* restore interrupt handler */ | |
1141 | if ((void *)cdev->handler == (void *)qdio_int_handler) | |
1142 | cdev->handler = irq_ptr->orig_handler; | |
1143 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1144 | ||
1145 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1146 | mutex_unlock(&irq_ptr->setup_mutex); | |
779e6e1c JG |
1147 | if (rc) |
1148 | return rc; | |
1149 | return 0; | |
1150 | } | |
1151 | EXPORT_SYMBOL_GPL(qdio_shutdown); | |
1152 | ||
1153 | /** | |
1154 | * qdio_free - free data structures for a qdio subchannel | |
1155 | * @cdev: associated ccw device | |
1156 | */ | |
1157 | int qdio_free(struct ccw_device *cdev) | |
1158 | { | |
22f99347 | 1159 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
58eb27cd | 1160 | |
779e6e1c JG |
1161 | if (!irq_ptr) |
1162 | return -ENODEV; | |
1163 | ||
22f99347 | 1164 | DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no); |
779e6e1c | 1165 | mutex_lock(&irq_ptr->setup_mutex); |
22f99347 JG |
1166 | |
1167 | if (irq_ptr->debug_area != NULL) { | |
1168 | debug_unregister(irq_ptr->debug_area); | |
1169 | irq_ptr->debug_area = NULL; | |
1170 | } | |
779e6e1c JG |
1171 | cdev->private->qdio_data = NULL; |
1172 | mutex_unlock(&irq_ptr->setup_mutex); | |
1173 | ||
1174 | qdio_release_memory(irq_ptr); | |
1175 | return 0; | |
1176 | } | |
1177 | EXPORT_SYMBOL_GPL(qdio_free); | |
1178 | ||
779e6e1c JG |
1179 | /** |
1180 | * qdio_allocate - allocate qdio queues and associated data | |
1181 | * @init_data: initialization data | |
1182 | */ | |
1183 | int qdio_allocate(struct qdio_initialize *init_data) | |
1184 | { | |
1185 | struct qdio_irq *irq_ptr; | |
779e6e1c | 1186 | |
22f99347 | 1187 | DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no); |
779e6e1c JG |
1188 | |
1189 | if ((init_data->no_input_qs && !init_data->input_handler) || | |
1190 | (init_data->no_output_qs && !init_data->output_handler)) | |
1191 | return -EINVAL; | |
1192 | ||
1193 | if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) || | |
1194 | (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)) | |
1195 | return -EINVAL; | |
1196 | ||
1197 | if ((!init_data->input_sbal_addr_array) || | |
1198 | (!init_data->output_sbal_addr_array)) | |
1199 | return -EINVAL; | |
1200 | ||
779e6e1c JG |
1201 | /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */ |
1202 | irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
1203 | if (!irq_ptr) | |
1204 | goto out_err; | |
779e6e1c JG |
1205 | |
1206 | mutex_init(&irq_ptr->setup_mutex); | |
22f99347 | 1207 | qdio_allocate_dbf(init_data, irq_ptr); |
779e6e1c JG |
1208 | |
1209 | /* | |
1210 | * Allocate a page for the chsc calls in qdio_establish. | |
1211 | * Must be pre-allocated since a zfcp recovery will call | |
1212 | * qdio_establish. In case of low memory and swap on a zfcp disk | |
1213 | * we may not be able to allocate memory otherwise. | |
1214 | */ | |
1215 | irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL); | |
1216 | if (!irq_ptr->chsc_page) | |
1217 | goto out_rel; | |
1218 | ||
1219 | /* qdr is used in ccw1.cda which is u32 */ | |
3b8e3004 | 1220 | irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
779e6e1c JG |
1221 | if (!irq_ptr->qdr) |
1222 | goto out_rel; | |
1223 | WARN_ON((unsigned long)irq_ptr->qdr & 0xfff); | |
1224 | ||
779e6e1c JG |
1225 | if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs, |
1226 | init_data->no_output_qs)) | |
1227 | goto out_rel; | |
1228 | ||
1229 | init_data->cdev->private->qdio_data = irq_ptr; | |
1230 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1231 | return 0; | |
1232 | out_rel: | |
1233 | qdio_release_memory(irq_ptr); | |
1234 | out_err: | |
1235 | return -ENOMEM; | |
1236 | } | |
1237 | EXPORT_SYMBOL_GPL(qdio_allocate); | |
1238 | ||
1239 | /** | |
1240 | * qdio_establish - establish queues on a qdio subchannel | |
1241 | * @init_data: initialization data | |
1242 | */ | |
1243 | int qdio_establish(struct qdio_initialize *init_data) | |
1244 | { | |
779e6e1c JG |
1245 | struct qdio_irq *irq_ptr; |
1246 | struct ccw_device *cdev = init_data->cdev; | |
1247 | unsigned long saveflags; | |
1248 | int rc; | |
1249 | ||
22f99347 | 1250 | DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no); |
58eb27cd | 1251 | |
779e6e1c JG |
1252 | irq_ptr = cdev->private->qdio_data; |
1253 | if (!irq_ptr) | |
1254 | return -ENODEV; | |
1255 | ||
1256 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1257 | return -EINVAL; | |
1258 | ||
779e6e1c JG |
1259 | mutex_lock(&irq_ptr->setup_mutex); |
1260 | qdio_setup_irq(init_data); | |
1261 | ||
1262 | rc = qdio_establish_thinint(irq_ptr); | |
1263 | if (rc) { | |
1264 | mutex_unlock(&irq_ptr->setup_mutex); | |
1265 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1266 | return rc; | |
1267 | } | |
1268 | ||
1269 | /* establish q */ | |
1270 | irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd; | |
1271 | irq_ptr->ccw.flags = CCW_FLAG_SLI; | |
1272 | irq_ptr->ccw.count = irq_ptr->equeue.count; | |
1273 | irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr); | |
1274 | ||
1275 | spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); | |
1276 | ccw_device_set_options_mask(cdev, 0); | |
1277 | ||
1278 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0); | |
1279 | if (rc) { | |
22f99347 JG |
1280 | DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no); |
1281 | DBF_ERROR("rc:%4x", rc); | |
779e6e1c JG |
1282 | } |
1283 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); | |
1284 | ||
1285 | if (rc) { | |
1286 | mutex_unlock(&irq_ptr->setup_mutex); | |
1287 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1288 | return rc; | |
1289 | } | |
1290 | ||
1291 | wait_event_interruptible_timeout(cdev->private->wait_q, | |
1292 | irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED || | |
1293 | irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ); | |
1294 | ||
1295 | if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) { | |
1296 | mutex_unlock(&irq_ptr->setup_mutex); | |
1297 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1298 | return -EIO; | |
1299 | } | |
1300 | ||
1301 | qdio_setup_ssqd_info(irq_ptr); | |
22f99347 | 1302 | DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac); |
779e6e1c JG |
1303 | |
1304 | /* qebsm is now setup if available, initialize buffer states */ | |
1305 | qdio_init_buf_states(irq_ptr); | |
1306 | ||
1307 | mutex_unlock(&irq_ptr->setup_mutex); | |
1308 | qdio_print_subchannel_info(irq_ptr, cdev); | |
1309 | qdio_setup_debug_entries(irq_ptr, cdev); | |
1310 | return 0; | |
1311 | } | |
1312 | EXPORT_SYMBOL_GPL(qdio_establish); | |
1313 | ||
1314 | /** | |
1315 | * qdio_activate - activate queues on a qdio subchannel | |
1316 | * @cdev: associated cdev | |
1317 | */ | |
1318 | int qdio_activate(struct ccw_device *cdev) | |
1319 | { | |
1320 | struct qdio_irq *irq_ptr; | |
1321 | int rc; | |
1322 | unsigned long saveflags; | |
779e6e1c | 1323 | |
22f99347 | 1324 | DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no); |
58eb27cd | 1325 | |
779e6e1c JG |
1326 | irq_ptr = cdev->private->qdio_data; |
1327 | if (!irq_ptr) | |
1328 | return -ENODEV; | |
1329 | ||
1330 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1331 | return -EINVAL; | |
1332 | ||
1333 | mutex_lock(&irq_ptr->setup_mutex); | |
1334 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { | |
1335 | rc = -EBUSY; | |
1336 | goto out; | |
1337 | } | |
1338 | ||
779e6e1c JG |
1339 | irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd; |
1340 | irq_ptr->ccw.flags = CCW_FLAG_SLI; | |
1341 | irq_ptr->ccw.count = irq_ptr->aqueue.count; | |
1342 | irq_ptr->ccw.cda = 0; | |
1343 | ||
1344 | spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); | |
1345 | ccw_device_set_options(cdev, CCWDEV_REPORT_ALL); | |
1346 | ||
1347 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE, | |
1348 | 0, DOIO_DENY_PREFETCH); | |
1349 | if (rc) { | |
22f99347 JG |
1350 | DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no); |
1351 | DBF_ERROR("rc:%4x", rc); | |
779e6e1c JG |
1352 | } |
1353 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); | |
1354 | ||
1355 | if (rc) | |
1356 | goto out; | |
1357 | ||
1358 | if (is_thinint_irq(irq_ptr)) | |
1359 | tiqdio_add_input_queues(irq_ptr); | |
1360 | ||
1361 | /* wait for subchannel to become active */ | |
1362 | msleep(5); | |
1363 | ||
1364 | switch (irq_ptr->state) { | |
1365 | case QDIO_IRQ_STATE_STOPPED: | |
1366 | case QDIO_IRQ_STATE_ERR: | |
e4c14e20 JG |
1367 | rc = -EIO; |
1368 | break; | |
779e6e1c JG |
1369 | default: |
1370 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE); | |
1371 | rc = 0; | |
1372 | } | |
1373 | out: | |
1374 | mutex_unlock(&irq_ptr->setup_mutex); | |
1375 | return rc; | |
1376 | } | |
1377 | EXPORT_SYMBOL_GPL(qdio_activate); | |
1378 | ||
1379 | static inline int buf_in_between(int bufnr, int start, int count) | |
1380 | { | |
1381 | int end = add_buf(start, count); | |
1382 | ||
1383 | if (end > start) { | |
1384 | if (bufnr >= start && bufnr < end) | |
1385 | return 1; | |
1386 | else | |
1387 | return 0; | |
1388 | } | |
1389 | ||
1390 | /* wrap-around case */ | |
1391 | if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) || | |
1392 | (bufnr < end)) | |
1393 | return 1; | |
1394 | else | |
1395 | return 0; | |
1396 | } | |
1397 | ||
1398 | /** | |
1399 | * handle_inbound - reset processed input buffers | |
1400 | * @q: queue containing the buffers | |
1401 | * @callflags: flags | |
1402 | * @bufnr: first buffer to process | |
1403 | * @count: how many buffers are emptied | |
1404 | */ | |
d303b6fd JG |
1405 | static int handle_inbound(struct qdio_q *q, unsigned int callflags, |
1406 | int bufnr, int count) | |
779e6e1c | 1407 | { |
d303b6fd | 1408 | int used, diff; |
779e6e1c | 1409 | |
6486cda6 JG |
1410 | qperf_inc(q, inbound_call); |
1411 | ||
50f769df JG |
1412 | if (!q->u.in.polling) |
1413 | goto set; | |
1414 | ||
1415 | /* protect against stop polling setting an ACK for an emptied slsb */ | |
1416 | if (count == QDIO_MAX_BUFFERS_PER_Q) { | |
1417 | /* overwriting everything, just delete polling status */ | |
1418 | q->u.in.polling = 0; | |
1419 | q->u.in.ack_count = 0; | |
1420 | goto set; | |
e85dea0e | 1421 | } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) { |
50f769df | 1422 | if (is_qebsm(q)) { |
e85dea0e | 1423 | /* partial overwrite, just update ack_start */ |
50f769df | 1424 | diff = add_buf(bufnr, count); |
e85dea0e | 1425 | diff = sub_buf(diff, q->u.in.ack_start); |
50f769df JG |
1426 | q->u.in.ack_count -= diff; |
1427 | if (q->u.in.ack_count <= 0) { | |
1428 | q->u.in.polling = 0; | |
1429 | q->u.in.ack_count = 0; | |
50f769df JG |
1430 | goto set; |
1431 | } | |
e85dea0e | 1432 | q->u.in.ack_start = add_buf(q->u.in.ack_start, diff); |
50f769df JG |
1433 | } |
1434 | else | |
1435 | /* the only ACK will be deleted, so stop polling */ | |
779e6e1c | 1436 | q->u.in.polling = 0; |
50f769df | 1437 | } |
779e6e1c | 1438 | |
50f769df | 1439 | set: |
779e6e1c | 1440 | count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count); |
779e6e1c JG |
1441 | |
1442 | used = atomic_add_return(count, &q->nr_buf_used) - count; | |
1443 | BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q); | |
1444 | ||
1445 | /* no need to signal as long as the adapter had free buffers */ | |
1446 | if (used) | |
d303b6fd | 1447 | return 0; |
779e6e1c | 1448 | |
d303b6fd JG |
1449 | if (need_siga_in(q)) |
1450 | return qdio_siga_input(q); | |
1451 | return 0; | |
779e6e1c JG |
1452 | } |
1453 | ||
1454 | /** | |
1455 | * handle_outbound - process filled outbound buffers | |
1456 | * @q: queue containing the buffers | |
1457 | * @callflags: flags | |
1458 | * @bufnr: first buffer to process | |
1459 | * @count: how many buffers are filled | |
1460 | */ | |
d303b6fd JG |
1461 | static int handle_outbound(struct qdio_q *q, unsigned int callflags, |
1462 | int bufnr, int count) | |
779e6e1c | 1463 | { |
c26001d4 | 1464 | unsigned char state = 0; |
d303b6fd | 1465 | int used, rc = 0; |
779e6e1c | 1466 | |
6486cda6 | 1467 | qperf_inc(q, outbound_call); |
779e6e1c JG |
1468 | |
1469 | count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count); | |
1470 | used = atomic_add_return(count, &q->nr_buf_used); | |
1471 | BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q); | |
1472 | ||
0195843b JG |
1473 | if (used == QDIO_MAX_BUFFERS_PER_Q) |
1474 | qperf_inc(q, outbound_queue_full); | |
1475 | ||
6486cda6 | 1476 | if (callflags & QDIO_FLAG_PCI_OUT) { |
779e6e1c | 1477 | q->u.out.pci_out_enabled = 1; |
6486cda6 | 1478 | qperf_inc(q, pci_request_int); |
110da317 | 1479 | } else |
779e6e1c JG |
1480 | q->u.out.pci_out_enabled = 0; |
1481 | ||
1482 | if (queue_type(q) == QDIO_IQDIO_QFMT) { | |
110da317 JG |
1483 | /* One SIGA-W per buffer required for unicast HiperSockets. */ |
1484 | WARN_ON_ONCE(count > 1 && !multicast_outbound(q)); | |
1485 | ||
1486 | rc = qdio_kick_outbound_q(q); | |
90adac58 | 1487 | } else if (need_siga_sync(q)) { |
110da317 JG |
1488 | rc = qdio_siga_sync_q(q); |
1489 | } else { | |
1490 | /* try to fast requeue buffers */ | |
1491 | get_buf_state(q, prev_buf(bufnr), &state, 0); | |
1492 | if (state != SLSB_CU_OUTPUT_PRIMED) | |
d303b6fd | 1493 | rc = qdio_kick_outbound_q(q); |
779e6e1c | 1494 | else |
110da317 | 1495 | qperf_inc(q, fast_requeue); |
779e6e1c JG |
1496 | } |
1497 | ||
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; | |
9a26513e JG |
1533 | if (!count) |
1534 | return 0; | |
779e6e1c | 1535 | if (callflags & QDIO_FLAG_SYNC_INPUT) |
d303b6fd JG |
1536 | return handle_inbound(irq_ptr->input_qs[q_nr], |
1537 | callflags, bufnr, count); | |
779e6e1c | 1538 | else if (callflags & QDIO_FLAG_SYNC_OUTPUT) |
d303b6fd JG |
1539 | return handle_outbound(irq_ptr->output_qs[q_nr], |
1540 | callflags, bufnr, count); | |
1541 | return -EINVAL; | |
779e6e1c JG |
1542 | } |
1543 | EXPORT_SYMBOL_GPL(do_QDIO); | |
1544 | ||
d36deae7 JG |
1545 | /** |
1546 | * qdio_start_irq - process input buffers | |
1547 | * @cdev: associated ccw_device for the qdio subchannel | |
1548 | * @nr: input queue number | |
1549 | * | |
1550 | * Return codes | |
1551 | * 0 - success | |
1552 | * 1 - irqs not started since new data is available | |
1553 | */ | |
1554 | int qdio_start_irq(struct ccw_device *cdev, int nr) | |
1555 | { | |
1556 | struct qdio_q *q; | |
1557 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1558 | ||
1559 | if (!irq_ptr) | |
1560 | return -ENODEV; | |
1561 | q = irq_ptr->input_qs[nr]; | |
1562 | ||
1563 | WARN_ON(queue_irqs_enabled(q)); | |
1564 | ||
4f325184 | 1565 | if (!shared_ind(q->irq_ptr->dsci)) |
d36deae7 JG |
1566 | xchg(q->irq_ptr->dsci, 0); |
1567 | ||
1568 | qdio_stop_polling(q); | |
1569 | clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state); | |
1570 | ||
1571 | /* | |
1572 | * We need to check again to not lose initiative after | |
1573 | * resetting the ACK state. | |
1574 | */ | |
4f325184 | 1575 | if (!shared_ind(q->irq_ptr->dsci) && *q->irq_ptr->dsci) |
d36deae7 JG |
1576 | goto rescan; |
1577 | if (!qdio_inbound_q_done(q)) | |
1578 | goto rescan; | |
1579 | return 0; | |
1580 | ||
1581 | rescan: | |
1582 | if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, | |
1583 | &q->u.in.queue_irq_state)) | |
1584 | return 0; | |
1585 | else | |
1586 | return 1; | |
1587 | ||
1588 | } | |
1589 | EXPORT_SYMBOL(qdio_start_irq); | |
1590 | ||
1591 | /** | |
1592 | * qdio_get_next_buffers - process input buffers | |
1593 | * @cdev: associated ccw_device for the qdio subchannel | |
1594 | * @nr: input queue number | |
1595 | * @bufnr: first filled buffer number | |
1596 | * @error: buffers are in error state | |
1597 | * | |
1598 | * Return codes | |
1599 | * < 0 - error | |
1600 | * = 0 - no new buffers found | |
1601 | * > 0 - number of processed buffers | |
1602 | */ | |
1603 | int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr, | |
1604 | int *error) | |
1605 | { | |
1606 | struct qdio_q *q; | |
1607 | int start, end; | |
1608 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1609 | ||
1610 | if (!irq_ptr) | |
1611 | return -ENODEV; | |
1612 | q = irq_ptr->input_qs[nr]; | |
1613 | WARN_ON(queue_irqs_enabled(q)); | |
1614 | ||
d36deae7 | 1615 | /* |
90adac58 JG |
1616 | * Cannot rely on automatic sync after interrupt since queues may |
1617 | * also be examined without interrupt. | |
d36deae7 | 1618 | */ |
90adac58 JG |
1619 | if (need_siga_sync(q)) |
1620 | qdio_sync_queues(q); | |
1621 | ||
1622 | /* check the PCI capable outbound queues. */ | |
d36deae7 JG |
1623 | qdio_check_outbound_after_thinint(q); |
1624 | ||
1625 | if (!qdio_inbound_q_moved(q)) | |
1626 | return 0; | |
1627 | ||
1628 | /* Note: upper-layer MUST stop processing immediately here ... */ | |
1629 | if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) | |
1630 | return -EIO; | |
1631 | ||
1632 | start = q->first_to_kick; | |
1633 | end = q->first_to_check; | |
1634 | *bufnr = start; | |
1635 | *error = q->qdio_error; | |
1636 | ||
1637 | /* for the next time */ | |
1638 | q->first_to_kick = end; | |
1639 | q->qdio_error = 0; | |
1640 | return sub_buf(end, start); | |
1641 | } | |
1642 | EXPORT_SYMBOL(qdio_get_next_buffers); | |
1643 | ||
1644 | /** | |
1645 | * qdio_stop_irq - disable interrupt processing for the device | |
1646 | * @cdev: associated ccw_device for the qdio subchannel | |
1647 | * @nr: input queue number | |
1648 | * | |
1649 | * Return codes | |
1650 | * 0 - interrupts were already disabled | |
1651 | * 1 - interrupts successfully disabled | |
1652 | */ | |
1653 | int qdio_stop_irq(struct ccw_device *cdev, int nr) | |
1654 | { | |
1655 | struct qdio_q *q; | |
1656 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1657 | ||
1658 | if (!irq_ptr) | |
1659 | return -ENODEV; | |
1660 | q = irq_ptr->input_qs[nr]; | |
1661 | ||
1662 | if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, | |
1663 | &q->u.in.queue_irq_state)) | |
1664 | return 0; | |
1665 | else | |
1666 | return 1; | |
1667 | } | |
1668 | EXPORT_SYMBOL(qdio_stop_irq); | |
1669 | ||
779e6e1c JG |
1670 | static int __init init_QDIO(void) |
1671 | { | |
1672 | int rc; | |
1673 | ||
aa5c8df3 | 1674 | rc = qdio_debug_init(); |
779e6e1c JG |
1675 | if (rc) |
1676 | return rc; | |
aa5c8df3 SO |
1677 | rc = qdio_setup_init(); |
1678 | if (rc) | |
1679 | goto out_debug; | |
779e6e1c JG |
1680 | rc = tiqdio_allocate_memory(); |
1681 | if (rc) | |
1682 | goto out_cache; | |
779e6e1c JG |
1683 | rc = tiqdio_register_thinints(); |
1684 | if (rc) | |
aa5c8df3 | 1685 | goto out_ti; |
779e6e1c JG |
1686 | return 0; |
1687 | ||
779e6e1c JG |
1688 | out_ti: |
1689 | tiqdio_free_memory(); | |
1690 | out_cache: | |
1691 | qdio_setup_exit(); | |
aa5c8df3 SO |
1692 | out_debug: |
1693 | qdio_debug_exit(); | |
779e6e1c JG |
1694 | return rc; |
1695 | } | |
1696 | ||
1697 | static void __exit exit_QDIO(void) | |
1698 | { | |
1699 | tiqdio_unregister_thinints(); | |
1700 | tiqdio_free_memory(); | |
779e6e1c | 1701 | qdio_setup_exit(); |
aa5c8df3 | 1702 | qdio_debug_exit(); |
779e6e1c JG |
1703 | } |
1704 | ||
1705 | module_init(init_QDIO); | |
1706 | module_exit(exit_QDIO); |