Commit | Line | Data |
---|---|---|
779e6e1c JG |
1 | /* |
2 | * linux/drivers/s390/cio/qdio_main.c | |
3 | * | |
4 | * Linux for s390 qdio support, buffer handling, qdio API and module support. | |
5 | * | |
6 | * Copyright 2000,2008 IBM Corp. | |
7 | * Author(s): Utz Bacher <utz.bacher@de.ibm.com> | |
8 | * Jan Glauber <jang@linux.vnet.ibm.com> | |
9 | * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com> | |
10 | */ | |
11 | #include <linux/module.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/timer.h> | |
15 | #include <linux/delay.h> | |
16 | #include <asm/atomic.h> | |
17 | #include <asm/debug.h> | |
18 | #include <asm/qdio.h> | |
19 | ||
20 | #include "cio.h" | |
21 | #include "css.h" | |
22 | #include "device.h" | |
23 | #include "qdio.h" | |
24 | #include "qdio_debug.h" | |
25 | #include "qdio_perf.h" | |
26 | ||
27 | MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\ | |
28 | "Jan Glauber <jang@linux.vnet.ibm.com>"); | |
29 | MODULE_DESCRIPTION("QDIO base support"); | |
30 | MODULE_LICENSE("GPL"); | |
31 | ||
32 | static inline int do_siga_sync(struct subchannel_id schid, | |
33 | unsigned int out_mask, unsigned int in_mask) | |
34 | { | |
35 | register unsigned long __fc asm ("0") = 2; | |
36 | register struct subchannel_id __schid asm ("1") = schid; | |
37 | register unsigned long out asm ("2") = out_mask; | |
38 | register unsigned long in asm ("3") = in_mask; | |
39 | int cc; | |
40 | ||
41 | asm volatile( | |
42 | " siga 0\n" | |
43 | " ipm %0\n" | |
44 | " srl %0,28\n" | |
45 | : "=d" (cc) | |
46 | : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc"); | |
47 | return cc; | |
48 | } | |
49 | ||
50 | static inline int do_siga_input(struct subchannel_id schid, unsigned int mask) | |
51 | { | |
52 | register unsigned long __fc asm ("0") = 1; | |
53 | register struct subchannel_id __schid asm ("1") = schid; | |
54 | register unsigned long __mask asm ("2") = mask; | |
55 | int cc; | |
56 | ||
57 | asm volatile( | |
58 | " siga 0\n" | |
59 | " ipm %0\n" | |
60 | " srl %0,28\n" | |
61 | : "=d" (cc) | |
62 | : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory"); | |
63 | return cc; | |
64 | } | |
65 | ||
66 | /** | |
67 | * do_siga_output - perform SIGA-w/wt function | |
68 | * @schid: subchannel id or in case of QEBSM the subchannel token | |
69 | * @mask: which output queues to process | |
70 | * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer | |
71 | * @fc: function code to perform | |
72 | * | |
73 | * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION. | |
74 | * Note: For IQDC unicast queues only the highest priority queue is processed. | |
75 | */ | |
76 | static inline int do_siga_output(unsigned long schid, unsigned long mask, | |
77 | u32 *bb, unsigned int fc) | |
78 | { | |
79 | register unsigned long __fc asm("0") = fc; | |
80 | register unsigned long __schid asm("1") = schid; | |
81 | register unsigned long __mask asm("2") = mask; | |
82 | int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION; | |
83 | ||
84 | asm volatile( | |
85 | " siga 0\n" | |
86 | "0: ipm %0\n" | |
87 | " srl %0,28\n" | |
88 | "1:\n" | |
89 | EX_TABLE(0b, 1b) | |
90 | : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask) | |
91 | : : "cc", "memory"); | |
92 | *bb = ((unsigned int) __fc) >> 31; | |
93 | return cc; | |
94 | } | |
95 | ||
96 | static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq) | |
97 | { | |
779e6e1c JG |
98 | /* all done or next buffer state different */ |
99 | if (ccq == 0 || ccq == 32) | |
100 | return 0; | |
101 | /* not all buffers processed */ | |
102 | if (ccq == 96 || ccq == 97) | |
103 | return 1; | |
104 | /* notify devices immediately */ | |
22f99347 | 105 | DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq); |
779e6e1c JG |
106 | return -EIO; |
107 | } | |
108 | ||
109 | /** | |
110 | * qdio_do_eqbs - extract buffer states for QEBSM | |
111 | * @q: queue to manipulate | |
112 | * @state: state of the extracted buffers | |
113 | * @start: buffer number to start at | |
114 | * @count: count of buffers to examine | |
50f769df | 115 | * @auto_ack: automatically acknowledge buffers |
779e6e1c JG |
116 | * |
117 | * Returns the number of successfull extracted equal buffer states. | |
118 | * Stops processing if a state is different from the last buffers state. | |
119 | */ | |
120 | static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state, | |
50f769df | 121 | int start, int count, int auto_ack) |
779e6e1c JG |
122 | { |
123 | unsigned int ccq = 0; | |
124 | int tmp_count = count, tmp_start = start; | |
125 | int nr = q->nr; | |
126 | int rc; | |
779e6e1c JG |
127 | |
128 | BUG_ON(!q->irq_ptr->sch_token); | |
23589d05 | 129 | qdio_perf_stat_inc(&perf_stats.debug_eqbs_all); |
779e6e1c JG |
130 | |
131 | if (!q->is_input_q) | |
132 | nr += q->irq_ptr->nr_input_qs; | |
133 | again: | |
50f769df JG |
134 | ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count, |
135 | auto_ack); | |
779e6e1c JG |
136 | rc = qdio_check_ccq(q, ccq); |
137 | ||
138 | /* At least one buffer was processed, return and extract the remaining | |
139 | * buffers later. | |
140 | */ | |
23589d05 JG |
141 | if ((ccq == 96) && (count != tmp_count)) { |
142 | qdio_perf_stat_inc(&perf_stats.debug_eqbs_incomplete); | |
779e6e1c | 143 | return (count - tmp_count); |
23589d05 | 144 | } |
22f99347 | 145 | |
779e6e1c | 146 | if (rc == 1) { |
22f99347 | 147 | DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq); |
779e6e1c JG |
148 | goto again; |
149 | } | |
150 | ||
151 | if (rc < 0) { | |
22f99347 JG |
152 | DBF_ERROR("%4x EQBS ERROR", SCH_NO(q)); |
153 | DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); | |
779e6e1c JG |
154 | q->handler(q->irq_ptr->cdev, |
155 | QDIO_ERROR_ACTIVATE_CHECK_CONDITION, | |
156 | 0, -1, -1, q->irq_ptr->int_parm); | |
157 | return 0; | |
158 | } | |
159 | return count - tmp_count; | |
160 | } | |
161 | ||
162 | /** | |
163 | * qdio_do_sqbs - set buffer states for QEBSM | |
164 | * @q: queue to manipulate | |
165 | * @state: new state of the buffers | |
166 | * @start: first buffer number to change | |
167 | * @count: how many buffers to change | |
168 | * | |
169 | * Returns the number of successfully changed buffers. | |
170 | * Does retrying until the specified count of buffer states is set or an | |
171 | * error occurs. | |
172 | */ | |
173 | static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start, | |
174 | int count) | |
175 | { | |
176 | unsigned int ccq = 0; | |
177 | int tmp_count = count, tmp_start = start; | |
178 | int nr = q->nr; | |
179 | int rc; | |
779e6e1c | 180 | |
50f769df JG |
181 | if (!count) |
182 | return 0; | |
183 | ||
779e6e1c | 184 | BUG_ON(!q->irq_ptr->sch_token); |
23589d05 | 185 | qdio_perf_stat_inc(&perf_stats.debug_sqbs_all); |
779e6e1c JG |
186 | |
187 | if (!q->is_input_q) | |
188 | nr += q->irq_ptr->nr_input_qs; | |
189 | again: | |
190 | ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count); | |
191 | rc = qdio_check_ccq(q, ccq); | |
192 | if (rc == 1) { | |
22f99347 | 193 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq); |
23589d05 | 194 | qdio_perf_stat_inc(&perf_stats.debug_sqbs_incomplete); |
779e6e1c JG |
195 | goto again; |
196 | } | |
197 | if (rc < 0) { | |
22f99347 JG |
198 | DBF_ERROR("%4x SQBS ERROR", SCH_NO(q)); |
199 | DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); | |
779e6e1c JG |
200 | q->handler(q->irq_ptr->cdev, |
201 | QDIO_ERROR_ACTIVATE_CHECK_CONDITION, | |
202 | 0, -1, -1, q->irq_ptr->int_parm); | |
203 | return 0; | |
204 | } | |
205 | WARN_ON(tmp_count); | |
206 | return count - tmp_count; | |
207 | } | |
208 | ||
209 | /* returns number of examined buffers and their common state in *state */ | |
210 | static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr, | |
50f769df JG |
211 | unsigned char *state, unsigned int count, |
212 | int auto_ack) | |
779e6e1c JG |
213 | { |
214 | unsigned char __state = 0; | |
215 | int i; | |
216 | ||
217 | BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK); | |
218 | BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q); | |
219 | ||
220 | if (is_qebsm(q)) | |
50f769df | 221 | return qdio_do_eqbs(q, state, bufnr, count, auto_ack); |
779e6e1c JG |
222 | |
223 | for (i = 0; i < count; i++) { | |
224 | if (!__state) | |
225 | __state = q->slsb.val[bufnr]; | |
226 | else if (q->slsb.val[bufnr] != __state) | |
227 | break; | |
228 | bufnr = next_buf(bufnr); | |
229 | } | |
230 | *state = __state; | |
231 | return i; | |
232 | } | |
233 | ||
234 | inline int get_buf_state(struct qdio_q *q, unsigned int bufnr, | |
50f769df | 235 | unsigned char *state, int auto_ack) |
779e6e1c | 236 | { |
50f769df | 237 | return get_buf_states(q, bufnr, state, 1, auto_ack); |
779e6e1c JG |
238 | } |
239 | ||
240 | /* wrap-around safe setting of slsb states, returns number of changed buffers */ | |
241 | static inline int set_buf_states(struct qdio_q *q, int bufnr, | |
242 | unsigned char state, int count) | |
243 | { | |
244 | int i; | |
245 | ||
246 | BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK); | |
247 | BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q); | |
248 | ||
249 | if (is_qebsm(q)) | |
250 | return qdio_do_sqbs(q, state, bufnr, count); | |
251 | ||
252 | for (i = 0; i < count; i++) { | |
253 | xchg(&q->slsb.val[bufnr], state); | |
254 | bufnr = next_buf(bufnr); | |
255 | } | |
256 | return count; | |
257 | } | |
258 | ||
259 | static inline int set_buf_state(struct qdio_q *q, int bufnr, | |
260 | unsigned char state) | |
261 | { | |
262 | return set_buf_states(q, bufnr, state, 1); | |
263 | } | |
264 | ||
265 | /* set slsb states to initial state */ | |
266 | void qdio_init_buf_states(struct qdio_irq *irq_ptr) | |
267 | { | |
268 | struct qdio_q *q; | |
269 | int i; | |
270 | ||
271 | for_each_input_queue(irq_ptr, q, i) | |
272 | set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT, | |
273 | QDIO_MAX_BUFFERS_PER_Q); | |
274 | for_each_output_queue(irq_ptr, q, i) | |
275 | set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT, | |
276 | QDIO_MAX_BUFFERS_PER_Q); | |
277 | } | |
278 | ||
279 | static int qdio_siga_sync(struct qdio_q *q, unsigned int output, | |
280 | unsigned int input) | |
281 | { | |
282 | int cc; | |
283 | ||
284 | if (!need_siga_sync(q)) | |
285 | return 0; | |
286 | ||
22f99347 JG |
287 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:"); |
288 | DBF_DEV_HEX(DBF_INFO, q->irq_ptr, q, sizeof(void *)); | |
779e6e1c JG |
289 | qdio_perf_stat_inc(&perf_stats.siga_sync); |
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 | ||
297 | inline int qdio_siga_sync_q(struct qdio_q *q) | |
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 | ||
315 | static inline int qdio_do_siga_output(struct qdio_q *q, unsigned int *busy_bit) | |
316 | { | |
317 | unsigned int fc = 0; | |
318 | unsigned long schid; | |
319 | ||
7a0f4755 KDW |
320 | if (q->u.out.use_enh_siga) { |
321 | fc = 3; | |
322 | } | |
779e6e1c JG |
323 | if (!is_qebsm(q)) |
324 | schid = *((u32 *)&q->irq_ptr->schid); | |
325 | else { | |
326 | schid = q->irq_ptr->sch_token; | |
327 | fc |= 0x80; | |
328 | } | |
329 | return do_siga_output(schid, q->mask, busy_bit, fc); | |
330 | } | |
331 | ||
332 | static int qdio_siga_output(struct qdio_q *q) | |
333 | { | |
334 | int cc; | |
335 | u32 busy_bit; | |
336 | u64 start_time = 0; | |
779e6e1c | 337 | |
22f99347 | 338 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr); |
779e6e1c JG |
339 | qdio_perf_stat_inc(&perf_stats.siga_out); |
340 | again: | |
341 | cc = qdio_do_siga_output(q, &busy_bit); | |
342 | if (queue_type(q) == QDIO_IQDIO_QFMT && cc == 2 && busy_bit) { | |
22f99347 | 343 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w bb:%2d", q->nr); |
58eb27cd | 344 | |
779e6e1c JG |
345 | if (!start_time) |
346 | start_time = get_usecs(); | |
347 | else if ((get_usecs() - start_time) < QDIO_BUSY_BIT_PATIENCE) | |
348 | goto again; | |
349 | } | |
350 | ||
351 | if (cc == 2 && busy_bit) | |
352 | cc |= QDIO_ERROR_SIGA_BUSY; | |
353 | if (cc) | |
22f99347 | 354 | DBF_ERROR("%4x SIGA-W:%2d", SCH_NO(q), cc); |
779e6e1c JG |
355 | return cc; |
356 | } | |
357 | ||
358 | static inline int qdio_siga_input(struct qdio_q *q) | |
359 | { | |
360 | int cc; | |
361 | ||
22f99347 | 362 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr); |
779e6e1c JG |
363 | qdio_perf_stat_inc(&perf_stats.siga_in); |
364 | ||
365 | cc = do_siga_input(q->irq_ptr->schid, q->mask); | |
366 | if (cc) | |
22f99347 | 367 | DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc); |
779e6e1c JG |
368 | return cc; |
369 | } | |
370 | ||
371 | /* called from thinint inbound handler */ | |
372 | void qdio_sync_after_thinint(struct qdio_q *q) | |
373 | { | |
374 | if (pci_out_supported(q)) { | |
375 | if (need_siga_sync_thinint(q)) | |
376 | qdio_siga_sync_all(q); | |
377 | else if (need_siga_sync_out_thinint(q)) | |
378 | qdio_siga_sync_out(q); | |
379 | } else | |
380 | qdio_siga_sync_q(q); | |
381 | } | |
382 | ||
383 | inline void qdio_stop_polling(struct qdio_q *q) | |
384 | { | |
50f769df | 385 | if (!q->u.in.polling) |
779e6e1c | 386 | return; |
50f769df | 387 | |
779e6e1c JG |
388 | q->u.in.polling = 0; |
389 | qdio_perf_stat_inc(&perf_stats.debug_stop_polling); | |
390 | ||
391 | /* show the card that we are not polling anymore */ | |
50f769df JG |
392 | if (is_qebsm(q)) { |
393 | set_buf_states(q, q->last_move_ftc, SLSB_P_INPUT_NOT_INIT, | |
394 | q->u.in.ack_count); | |
395 | q->u.in.ack_count = 0; | |
396 | } else | |
397 | set_buf_state(q, q->last_move_ftc, SLSB_P_INPUT_NOT_INIT); | |
779e6e1c JG |
398 | } |
399 | ||
50f769df | 400 | static void announce_buffer_error(struct qdio_q *q, int count) |
779e6e1c | 401 | { |
50f769df JG |
402 | q->qdio_error = QDIO_ERROR_SLSB_STATE; |
403 | ||
404 | /* special handling for no target buffer empty */ | |
405 | if ((!q->is_input_q && | |
406 | (q->sbal[q->first_to_check]->element[15].flags & 0xff) == 0x10)) { | |
407 | qdio_perf_stat_inc(&perf_stats.outbound_target_full); | |
408 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%3d", | |
409 | q->first_to_check); | |
410 | return; | |
411 | } | |
412 | ||
22f99347 JG |
413 | DBF_ERROR("%4x BUF ERROR", SCH_NO(q)); |
414 | DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr); | |
50f769df | 415 | DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count); |
22f99347 JG |
416 | DBF_ERROR("F14:%2x F15:%2x", |
417 | q->sbal[q->first_to_check]->element[14].flags & 0xff, | |
418 | q->sbal[q->first_to_check]->element[15].flags & 0xff); | |
50f769df | 419 | } |
779e6e1c | 420 | |
50f769df JG |
421 | static inline void inbound_primed(struct qdio_q *q, int count) |
422 | { | |
423 | int new; | |
424 | ||
425 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %3d", count); | |
426 | ||
427 | /* for QEBSM the ACK was already set by EQBS */ | |
428 | if (is_qebsm(q)) { | |
429 | if (!q->u.in.polling) { | |
430 | q->u.in.polling = 1; | |
431 | q->u.in.ack_count = count; | |
432 | q->last_move_ftc = q->first_to_check; | |
433 | return; | |
434 | } | |
435 | ||
436 | /* delete the previous ACK's */ | |
437 | set_buf_states(q, q->last_move_ftc, SLSB_P_INPUT_NOT_INIT, | |
438 | q->u.in.ack_count); | |
439 | q->u.in.ack_count = count; | |
440 | q->last_move_ftc = q->first_to_check; | |
441 | return; | |
442 | } | |
443 | ||
444 | /* | |
445 | * ACK the newest buffer. The ACK will be removed in qdio_stop_polling | |
446 | * or by the next inbound run. | |
447 | */ | |
448 | new = add_buf(q->first_to_check, count - 1); | |
449 | if (q->u.in.polling) { | |
450 | /* reset the previous ACK but first set the new one */ | |
451 | set_buf_state(q, new, SLSB_P_INPUT_ACK); | |
452 | set_buf_state(q, q->last_move_ftc, SLSB_P_INPUT_NOT_INIT); | |
453 | } | |
454 | else { | |
455 | q->u.in.polling = 1; | |
456 | set_buf_state(q, q->first_to_check, SLSB_P_INPUT_ACK); | |
457 | } | |
458 | ||
459 | q->last_move_ftc = new; | |
460 | count--; | |
461 | if (!count) | |
462 | return; | |
463 | ||
464 | /* | |
465 | * Need to change all PRIMED buffers to NOT_INIT, otherwise | |
466 | * we're loosing initiative in the thinint code. | |
467 | */ | |
468 | set_buf_states(q, next_buf(q->first_to_check), SLSB_P_INPUT_NOT_INIT, | |
469 | count); | |
779e6e1c JG |
470 | } |
471 | ||
472 | static int get_inbound_buffer_frontier(struct qdio_q *q) | |
473 | { | |
474 | int count, stop; | |
475 | unsigned char state; | |
476 | ||
779e6e1c JG |
477 | /* |
478 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved | |
479 | * would return 0. | |
480 | */ | |
481 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); | |
482 | stop = add_buf(q->first_to_check, count); | |
483 | ||
484 | /* | |
485 | * No siga sync here, as a PCI or we after a thin interrupt | |
486 | * will sync the queues. | |
487 | */ | |
488 | ||
489 | /* need to set count to 1 for non-qebsm */ | |
490 | if (!is_qebsm(q)) | |
491 | count = 1; | |
492 | ||
493 | check_next: | |
494 | if (q->first_to_check == stop) | |
495 | goto out; | |
496 | ||
50f769df | 497 | count = get_buf_states(q, q->first_to_check, &state, count, 1); |
779e6e1c JG |
498 | if (!count) |
499 | goto out; | |
500 | ||
501 | switch (state) { | |
502 | case SLSB_P_INPUT_PRIMED: | |
50f769df | 503 | inbound_primed(q, count); |
779e6e1c JG |
504 | /* |
505 | * No siga-sync needed for non-qebsm here, as the inbound queue | |
506 | * will be synced on the next siga-r, resp. | |
507 | * tiqdio_is_inbound_q_done will do the siga-sync. | |
508 | */ | |
509 | q->first_to_check = add_buf(q->first_to_check, count); | |
510 | atomic_sub(count, &q->nr_buf_used); | |
511 | goto check_next; | |
512 | case SLSB_P_INPUT_ERROR: | |
50f769df | 513 | announce_buffer_error(q, count); |
779e6e1c JG |
514 | /* process the buffer, the upper layer will take care of it */ |
515 | q->first_to_check = add_buf(q->first_to_check, count); | |
516 | atomic_sub(count, &q->nr_buf_used); | |
517 | break; | |
518 | case SLSB_CU_INPUT_EMPTY: | |
519 | case SLSB_P_INPUT_NOT_INIT: | |
520 | case SLSB_P_INPUT_ACK: | |
22f99347 | 521 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop"); |
779e6e1c JG |
522 | break; |
523 | default: | |
524 | BUG(); | |
525 | } | |
526 | out: | |
779e6e1c JG |
527 | return q->first_to_check; |
528 | } | |
529 | ||
530 | int qdio_inbound_q_moved(struct qdio_q *q) | |
531 | { | |
532 | int bufnr; | |
533 | ||
534 | bufnr = get_inbound_buffer_frontier(q); | |
535 | ||
536 | if ((bufnr != q->last_move_ftc) || q->qdio_error) { | |
537 | if (!need_siga_sync(q) && !pci_out_supported(q)) | |
538 | q->u.in.timestamp = get_usecs(); | |
539 | ||
22f99347 | 540 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in moved"); |
779e6e1c JG |
541 | return 1; |
542 | } else | |
543 | return 0; | |
544 | } | |
545 | ||
546 | static int qdio_inbound_q_done(struct qdio_q *q) | |
547 | { | |
9a1ce28a | 548 | unsigned char state = 0; |
779e6e1c JG |
549 | |
550 | if (!atomic_read(&q->nr_buf_used)) | |
551 | return 1; | |
552 | ||
553 | /* | |
554 | * We need that one for synchronization with the adapter, as it | |
555 | * does a kind of PCI avoidance. | |
556 | */ | |
557 | qdio_siga_sync_q(q); | |
558 | ||
50f769df | 559 | get_buf_state(q, q->first_to_check, &state, 0); |
779e6e1c JG |
560 | if (state == SLSB_P_INPUT_PRIMED) |
561 | /* we got something to do */ | |
562 | return 0; | |
563 | ||
564 | /* on VM, we don't poll, so the q is always done here */ | |
565 | if (need_siga_sync(q) || pci_out_supported(q)) | |
566 | return 1; | |
567 | ||
568 | /* | |
569 | * At this point we know, that inbound first_to_check | |
570 | * has (probably) not moved (see qdio_inbound_processing). | |
571 | */ | |
572 | if (get_usecs() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) { | |
22f99347 JG |
573 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%3d", |
574 | q->first_to_check); | |
779e6e1c JG |
575 | return 1; |
576 | } else { | |
22f99347 JG |
577 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in notd:%3d", |
578 | q->first_to_check); | |
779e6e1c JG |
579 | return 0; |
580 | } | |
581 | } | |
582 | ||
583 | void qdio_kick_inbound_handler(struct qdio_q *q) | |
584 | { | |
585 | int count, start, end; | |
779e6e1c JG |
586 | |
587 | qdio_perf_stat_inc(&perf_stats.inbound_handler); | |
588 | ||
589 | start = q->first_to_kick; | |
590 | end = q->first_to_check; | |
591 | if (end >= start) | |
592 | count = end - start; | |
593 | else | |
594 | count = end + QDIO_MAX_BUFFERS_PER_Q - start; | |
595 | ||
22f99347 | 596 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%3d c:%3d", start, count); |
779e6e1c JG |
597 | |
598 | if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) | |
599 | return; | |
600 | ||
601 | q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, | |
602 | start, count, q->irq_ptr->int_parm); | |
603 | ||
604 | /* for the next time */ | |
605 | q->first_to_kick = q->first_to_check; | |
606 | q->qdio_error = 0; | |
607 | } | |
608 | ||
609 | static void __qdio_inbound_processing(struct qdio_q *q) | |
610 | { | |
611 | qdio_perf_stat_inc(&perf_stats.tasklet_inbound); | |
612 | again: | |
613 | if (!qdio_inbound_q_moved(q)) | |
614 | return; | |
615 | ||
616 | qdio_kick_inbound_handler(q); | |
617 | ||
618 | if (!qdio_inbound_q_done(q)) | |
619 | /* means poll time is not yet over */ | |
620 | goto again; | |
621 | ||
622 | qdio_stop_polling(q); | |
623 | /* | |
624 | * We need to check again to not lose initiative after | |
625 | * resetting the ACK state. | |
626 | */ | |
627 | if (!qdio_inbound_q_done(q)) | |
628 | goto again; | |
629 | } | |
630 | ||
631 | /* inbound tasklet */ | |
632 | void qdio_inbound_processing(unsigned long data) | |
633 | { | |
634 | struct qdio_q *q = (struct qdio_q *)data; | |
635 | __qdio_inbound_processing(q); | |
636 | } | |
637 | ||
638 | static int get_outbound_buffer_frontier(struct qdio_q *q) | |
639 | { | |
640 | int count, stop; | |
641 | unsigned char state; | |
642 | ||
643 | if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) || | |
644 | (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q))) | |
645 | qdio_siga_sync_q(q); | |
646 | ||
647 | /* | |
648 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved | |
649 | * would return 0. | |
650 | */ | |
651 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); | |
652 | stop = add_buf(q->first_to_check, count); | |
653 | ||
654 | /* need to set count to 1 for non-qebsm */ | |
655 | if (!is_qebsm(q)) | |
656 | count = 1; | |
657 | ||
658 | check_next: | |
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 */ | |
22f99347 | 669 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %3d", 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); | |
673 | /* | |
674 | * We fetch all buffer states at once. get_buf_states may | |
675 | * return count < stop. For QEBSM we do not loop. | |
676 | */ | |
677 | if (is_qebsm(q)) | |
678 | break; | |
679 | goto check_next; | |
680 | case SLSB_P_OUTPUT_ERROR: | |
50f769df | 681 | announce_buffer_error(q, count); |
779e6e1c JG |
682 | /* process the buffer, the upper layer will take care of it */ |
683 | q->first_to_check = add_buf(q->first_to_check, count); | |
684 | atomic_sub(count, &q->nr_buf_used); | |
685 | break; | |
686 | case SLSB_CU_OUTPUT_PRIMED: | |
687 | /* the adapter has not fetched the output yet */ | |
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 | ||
711 | if ((bufnr != q->last_move_ftc) || q->qdio_error) { | |
712 | q->last_move_ftc = 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 | ||
719 | /* | |
720 | * VM could present us cc=2 and busy bit set on SIGA-write | |
721 | * during reconfiguration of their Guest LAN (only in iqdio mode, | |
722 | * otherwise qdio is asynchronous and cc=2 and busy bit there will take | |
723 | * the queues down immediately). | |
724 | * | |
725 | * Therefore qdio_siga_output will try for a short time constantly, | |
726 | * if such a condition occurs. If it doesn't change, it will | |
727 | * increase the busy_siga_counter and save the timestamp, and | |
728 | * schedule the queue for later processing. qdio_outbound_processing | |
729 | * will check out the counter. If non-zero, it will call qdio_kick_outbound_q | |
730 | * as often as the value of the counter. This will attempt further SIGA | |
731 | * instructions. For each successful SIGA, the counter is | |
732 | * decreased, for failing SIGAs the counter remains the same, after | |
733 | * all. After some time of no movement, qdio_kick_outbound_q will | |
734 | * finally fail and reflect corresponding error codes to call | |
735 | * the upper layer module and have it take the queues down. | |
736 | * | |
737 | * Note that this is a change from the original HiperSockets design | |
738 | * (saying cc=2 and busy bit means take the queues down), but in | |
739 | * these days Guest LAN didn't exist... excessive cc=2 with busy bit | |
740 | * conditions will still take the queues down, but the threshold is | |
741 | * higher due to the Guest LAN environment. | |
742 | * | |
743 | * Called from outbound tasklet and do_QDIO handler. | |
744 | */ | |
745 | static void qdio_kick_outbound_q(struct qdio_q *q) | |
746 | { | |
747 | int rc; | |
779e6e1c | 748 | |
22f99347 | 749 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kickoutq:%1d", q->nr); |
779e6e1c JG |
750 | |
751 | if (!need_siga_out(q)) | |
752 | return; | |
753 | ||
754 | rc = qdio_siga_output(q); | |
755 | switch (rc) { | |
756 | case 0: | |
779e6e1c | 757 | /* TODO: improve error handling for CC=0 case */ |
22f99347 JG |
758 | if (q->u.out.timestamp) |
759 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "cc2 rslv:%4x", | |
760 | atomic_read(&q->u.out.busy_siga_counter)); | |
58eb27cd JG |
761 | /* went smooth this time, reset timestamp */ |
762 | q->u.out.timestamp = 0; | |
779e6e1c JG |
763 | break; |
764 | /* cc=2 and busy bit */ | |
765 | case (2 | QDIO_ERROR_SIGA_BUSY): | |
766 | atomic_inc(&q->u.out.busy_siga_counter); | |
767 | ||
768 | /* if the last siga was successful, save timestamp here */ | |
769 | if (!q->u.out.timestamp) | |
770 | q->u.out.timestamp = get_usecs(); | |
771 | ||
772 | /* if we're in time, don't touch qdio_error */ | |
773 | if (get_usecs() - q->u.out.timestamp < QDIO_BUSY_BIT_GIVE_UP) { | |
774 | tasklet_schedule(&q->tasklet); | |
775 | break; | |
776 | } | |
22f99347 | 777 | DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr); |
779e6e1c JG |
778 | default: |
779 | /* for plain cc=1, 2 or 3 */ | |
780 | q->qdio_error = rc; | |
781 | } | |
782 | } | |
783 | ||
784 | static void qdio_kick_outbound_handler(struct qdio_q *q) | |
785 | { | |
786 | int start, end, count; | |
779e6e1c JG |
787 | |
788 | start = q->first_to_kick; | |
789 | end = q->last_move_ftc; | |
790 | if (end >= start) | |
791 | count = end - start; | |
792 | else | |
793 | count = end + QDIO_MAX_BUFFERS_PER_Q - start; | |
794 | ||
22f99347 JG |
795 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kickouth: %1d", q->nr); |
796 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "s:%3d c:%3d", start, count); | |
779e6e1c JG |
797 | |
798 | if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) | |
799 | return; | |
800 | ||
801 | q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count, | |
802 | q->irq_ptr->int_parm); | |
803 | ||
804 | /* for the next time: */ | |
805 | q->first_to_kick = q->last_move_ftc; | |
806 | q->qdio_error = 0; | |
807 | } | |
808 | ||
809 | static void __qdio_outbound_processing(struct qdio_q *q) | |
810 | { | |
811 | int siga_attempts; | |
812 | ||
813 | qdio_perf_stat_inc(&perf_stats.tasklet_outbound); | |
814 | ||
815 | /* see comment in qdio_kick_outbound_q */ | |
816 | siga_attempts = atomic_read(&q->u.out.busy_siga_counter); | |
817 | while (siga_attempts--) { | |
818 | atomic_dec(&q->u.out.busy_siga_counter); | |
819 | qdio_kick_outbound_q(q); | |
820 | } | |
821 | ||
822 | BUG_ON(atomic_read(&q->nr_buf_used) < 0); | |
823 | ||
824 | if (qdio_outbound_q_moved(q)) | |
825 | qdio_kick_outbound_handler(q); | |
826 | ||
827 | if (queue_type(q) == QDIO_ZFCP_QFMT) { | |
828 | if (!pci_out_supported(q) && !qdio_outbound_q_done(q)) | |
829 | tasklet_schedule(&q->tasklet); | |
830 | return; | |
831 | } | |
832 | ||
833 | /* bail out for HiperSockets unicast queues */ | |
834 | if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q)) | |
835 | return; | |
836 | ||
4bcb3a37 UB |
837 | if ((queue_type(q) == QDIO_IQDIO_QFMT) && |
838 | (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL) { | |
839 | tasklet_schedule(&q->tasklet); | |
840 | return; | |
841 | } | |
842 | ||
779e6e1c JG |
843 | if (q->u.out.pci_out_enabled) |
844 | return; | |
845 | ||
846 | /* | |
847 | * Now we know that queue type is either qeth without pci enabled | |
848 | * or HiperSockets multicast. Make sure buffer switch from PRIMED to | |
849 | * EMPTY is noticed and outbound_handler is called after some time. | |
850 | */ | |
851 | if (qdio_outbound_q_done(q)) | |
852 | del_timer(&q->u.out.timer); | |
853 | else { | |
854 | if (!timer_pending(&q->u.out.timer)) { | |
855 | mod_timer(&q->u.out.timer, jiffies + 10 * HZ); | |
856 | qdio_perf_stat_inc(&perf_stats.debug_tl_out_timer); | |
857 | } | |
858 | } | |
859 | } | |
860 | ||
861 | /* outbound tasklet */ | |
862 | void qdio_outbound_processing(unsigned long data) | |
863 | { | |
864 | struct qdio_q *q = (struct qdio_q *)data; | |
865 | __qdio_outbound_processing(q); | |
866 | } | |
867 | ||
868 | void qdio_outbound_timer(unsigned long data) | |
869 | { | |
870 | struct qdio_q *q = (struct qdio_q *)data; | |
871 | tasklet_schedule(&q->tasklet); | |
872 | } | |
873 | ||
874 | /* called from thinint inbound tasklet */ | |
875 | void qdio_check_outbound_after_thinint(struct qdio_q *q) | |
876 | { | |
877 | struct qdio_q *out; | |
878 | int i; | |
879 | ||
880 | if (!pci_out_supported(q)) | |
881 | return; | |
882 | ||
883 | for_each_output_queue(q->irq_ptr, out, i) | |
884 | if (!qdio_outbound_q_done(out)) | |
885 | tasklet_schedule(&out->tasklet); | |
886 | } | |
887 | ||
888 | static inline void qdio_set_state(struct qdio_irq *irq_ptr, | |
889 | enum qdio_irq_states state) | |
890 | { | |
22f99347 | 891 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state); |
779e6e1c JG |
892 | |
893 | irq_ptr->state = state; | |
894 | mb(); | |
895 | } | |
896 | ||
22f99347 | 897 | static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb) |
779e6e1c | 898 | { |
779e6e1c | 899 | if (irb->esw.esw0.erw.cons) { |
22f99347 JG |
900 | DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no); |
901 | DBF_ERROR_HEX(irb, 64); | |
902 | DBF_ERROR_HEX(irb->ecw, 64); | |
779e6e1c JG |
903 | } |
904 | } | |
905 | ||
906 | /* PCI interrupt handler */ | |
907 | static void qdio_int_handler_pci(struct qdio_irq *irq_ptr) | |
908 | { | |
909 | int i; | |
910 | struct qdio_q *q; | |
911 | ||
912 | qdio_perf_stat_inc(&perf_stats.pci_int); | |
913 | ||
914 | for_each_input_queue(irq_ptr, q, i) | |
915 | tasklet_schedule(&q->tasklet); | |
916 | ||
917 | if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED)) | |
918 | return; | |
919 | ||
920 | for_each_output_queue(irq_ptr, q, i) { | |
921 | if (qdio_outbound_q_done(q)) | |
922 | continue; | |
923 | ||
924 | if (!siga_syncs_out_pci(q)) | |
925 | qdio_siga_sync_q(q); | |
926 | ||
927 | tasklet_schedule(&q->tasklet); | |
928 | } | |
929 | } | |
930 | ||
931 | static void qdio_handle_activate_check(struct ccw_device *cdev, | |
932 | unsigned long intparm, int cstat, int dstat) | |
933 | { | |
934 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
935 | struct qdio_q *q; | |
779e6e1c | 936 | |
22f99347 JG |
937 | DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no); |
938 | DBF_ERROR("intp :%lx", intparm); | |
939 | DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); | |
779e6e1c JG |
940 | |
941 | if (irq_ptr->nr_input_qs) { | |
942 | q = irq_ptr->input_qs[0]; | |
943 | } else if (irq_ptr->nr_output_qs) { | |
944 | q = irq_ptr->output_qs[0]; | |
945 | } else { | |
946 | dump_stack(); | |
947 | goto no_handler; | |
948 | } | |
949 | q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION, | |
950 | 0, -1, -1, irq_ptr->int_parm); | |
951 | no_handler: | |
952 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); | |
953 | } | |
954 | ||
955 | static void qdio_call_shutdown(struct work_struct *work) | |
956 | { | |
957 | struct ccw_device_private *priv; | |
958 | struct ccw_device *cdev; | |
959 | ||
960 | priv = container_of(work, struct ccw_device_private, kick_work); | |
961 | cdev = priv->cdev; | |
962 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
963 | put_device(&cdev->dev); | |
964 | } | |
965 | ||
966 | static void qdio_int_error(struct ccw_device *cdev) | |
967 | { | |
968 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
969 | ||
970 | switch (irq_ptr->state) { | |
971 | case QDIO_IRQ_STATE_INACTIVE: | |
972 | case QDIO_IRQ_STATE_CLEANUP: | |
973 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); | |
974 | break; | |
975 | case QDIO_IRQ_STATE_ESTABLISHED: | |
976 | case QDIO_IRQ_STATE_ACTIVE: | |
977 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); | |
978 | if (get_device(&cdev->dev)) { | |
979 | /* Can't call shutdown from interrupt context. */ | |
980 | PREPARE_WORK(&cdev->private->kick_work, | |
981 | qdio_call_shutdown); | |
982 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
983 | } | |
984 | break; | |
985 | default: | |
986 | WARN_ON(1); | |
987 | } | |
988 | wake_up(&cdev->private->wait_q); | |
989 | } | |
990 | ||
991 | static int qdio_establish_check_errors(struct ccw_device *cdev, int cstat, | |
22f99347 | 992 | int dstat) |
779e6e1c JG |
993 | { |
994 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
995 | ||
996 | if (cstat || (dstat & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))) { | |
22f99347 | 997 | DBF_ERROR("EQ:ck con"); |
779e6e1c JG |
998 | goto error; |
999 | } | |
1000 | ||
1001 | if (!(dstat & DEV_STAT_DEV_END)) { | |
22f99347 | 1002 | DBF_ERROR("EQ:no dev"); |
779e6e1c JG |
1003 | goto error; |
1004 | } | |
1005 | ||
1006 | if (dstat & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) { | |
22f99347 | 1007 | DBF_ERROR("EQ: bad io"); |
779e6e1c JG |
1008 | goto error; |
1009 | } | |
1010 | return 0; | |
1011 | error: | |
22f99347 JG |
1012 | DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no); |
1013 | DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); | |
1014 | ||
779e6e1c JG |
1015 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); |
1016 | return 1; | |
1017 | } | |
1018 | ||
1019 | static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat, | |
1020 | int dstat) | |
1021 | { | |
1022 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
779e6e1c | 1023 | |
22f99347 | 1024 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq"); |
779e6e1c JG |
1025 | if (!qdio_establish_check_errors(cdev, cstat, dstat)) |
1026 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED); | |
1027 | } | |
1028 | ||
1029 | /* qdio interrupt handler */ | |
1030 | void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm, | |
1031 | struct irb *irb) | |
1032 | { | |
1033 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1034 | int cstat, dstat; | |
779e6e1c JG |
1035 | |
1036 | qdio_perf_stat_inc(&perf_stats.qdio_int); | |
1037 | ||
1038 | if (!intparm || !irq_ptr) { | |
22f99347 | 1039 | DBF_ERROR("qint:%4x", cdev->private->schid.sch_no); |
779e6e1c JG |
1040 | return; |
1041 | } | |
1042 | ||
1043 | if (IS_ERR(irb)) { | |
1044 | switch (PTR_ERR(irb)) { | |
1045 | case -EIO: | |
22f99347 | 1046 | DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no); |
779e6e1c JG |
1047 | return; |
1048 | case -ETIMEDOUT: | |
22f99347 | 1049 | DBF_ERROR("%4x IO timeout", irq_ptr->schid.sch_no); |
779e6e1c JG |
1050 | qdio_int_error(cdev); |
1051 | return; | |
1052 | default: | |
1053 | WARN_ON(1); | |
1054 | return; | |
1055 | } | |
1056 | } | |
22f99347 | 1057 | qdio_irq_check_sense(irq_ptr, irb); |
779e6e1c JG |
1058 | |
1059 | cstat = irb->scsw.cmd.cstat; | |
1060 | dstat = irb->scsw.cmd.dstat; | |
1061 | ||
1062 | switch (irq_ptr->state) { | |
1063 | case QDIO_IRQ_STATE_INACTIVE: | |
1064 | qdio_establish_handle_irq(cdev, cstat, dstat); | |
1065 | break; | |
1066 | ||
1067 | case QDIO_IRQ_STATE_CLEANUP: | |
1068 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1069 | break; | |
1070 | ||
1071 | case QDIO_IRQ_STATE_ESTABLISHED: | |
1072 | case QDIO_IRQ_STATE_ACTIVE: | |
1073 | if (cstat & SCHN_STAT_PCI) { | |
1074 | qdio_int_handler_pci(irq_ptr); | |
1075 | /* no state change so no need to wake up wait_q */ | |
1076 | return; | |
1077 | } | |
1078 | if ((cstat & ~SCHN_STAT_PCI) || dstat) { | |
1079 | qdio_handle_activate_check(cdev, intparm, cstat, | |
1080 | dstat); | |
1081 | break; | |
1082 | } | |
1083 | default: | |
1084 | WARN_ON(1); | |
1085 | } | |
1086 | wake_up(&cdev->private->wait_q); | |
1087 | } | |
1088 | ||
1089 | /** | |
1090 | * qdio_get_ssqd_desc - get qdio subchannel description | |
1091 | * @cdev: ccw device to get description for | |
bbd50e17 | 1092 | * @data: where to store the ssqd |
779e6e1c | 1093 | * |
bbd50e17 JG |
1094 | * Returns 0 or an error code. The results of the chsc are stored in the |
1095 | * specified structure. | |
779e6e1c | 1096 | */ |
bbd50e17 JG |
1097 | int qdio_get_ssqd_desc(struct ccw_device *cdev, |
1098 | struct qdio_ssqd_desc *data) | |
779e6e1c | 1099 | { |
779e6e1c | 1100 | |
bbd50e17 JG |
1101 | if (!cdev || !cdev->private) |
1102 | return -EINVAL; | |
1103 | ||
22f99347 | 1104 | DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no); |
bbd50e17 | 1105 | return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data); |
779e6e1c JG |
1106 | } |
1107 | EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc); | |
1108 | ||
1109 | /** | |
1110 | * qdio_cleanup - shutdown queues and free data structures | |
1111 | * @cdev: associated ccw device | |
1112 | * @how: use halt or clear to shutdown | |
1113 | * | |
1114 | * This function calls qdio_shutdown() for @cdev with method @how | |
1115 | * and on success qdio_free() for @cdev. | |
1116 | */ | |
1117 | int qdio_cleanup(struct ccw_device *cdev, int how) | |
1118 | { | |
22f99347 | 1119 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
779e6e1c JG |
1120 | int rc; |
1121 | ||
779e6e1c JG |
1122 | if (!irq_ptr) |
1123 | return -ENODEV; | |
1124 | ||
779e6e1c JG |
1125 | rc = qdio_shutdown(cdev, how); |
1126 | if (rc == 0) | |
1127 | rc = qdio_free(cdev); | |
1128 | return rc; | |
1129 | } | |
1130 | EXPORT_SYMBOL_GPL(qdio_cleanup); | |
1131 | ||
1132 | static void qdio_shutdown_queues(struct ccw_device *cdev) | |
1133 | { | |
1134 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1135 | struct qdio_q *q; | |
1136 | int i; | |
1137 | ||
1138 | for_each_input_queue(irq_ptr, q, i) | |
1139 | tasklet_disable(&q->tasklet); | |
1140 | ||
1141 | for_each_output_queue(irq_ptr, q, i) { | |
1142 | tasklet_disable(&q->tasklet); | |
1143 | del_timer(&q->u.out.timer); | |
1144 | } | |
1145 | } | |
1146 | ||
1147 | /** | |
1148 | * qdio_shutdown - shut down a qdio subchannel | |
1149 | * @cdev: associated ccw device | |
1150 | * @how: use halt or clear to shutdown | |
1151 | */ | |
1152 | int qdio_shutdown(struct ccw_device *cdev, int how) | |
1153 | { | |
22f99347 | 1154 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
779e6e1c JG |
1155 | int rc; |
1156 | unsigned long flags; | |
779e6e1c | 1157 | |
779e6e1c JG |
1158 | if (!irq_ptr) |
1159 | return -ENODEV; | |
1160 | ||
22f99347 JG |
1161 | DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no); |
1162 | ||
779e6e1c JG |
1163 | mutex_lock(&irq_ptr->setup_mutex); |
1164 | /* | |
1165 | * Subchannel was already shot down. We cannot prevent being called | |
1166 | * twice since cio may trigger a shutdown asynchronously. | |
1167 | */ | |
1168 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { | |
1169 | mutex_unlock(&irq_ptr->setup_mutex); | |
1170 | return 0; | |
1171 | } | |
1172 | ||
779e6e1c JG |
1173 | tiqdio_remove_input_queues(irq_ptr); |
1174 | qdio_shutdown_queues(cdev); | |
1175 | qdio_shutdown_debug_entries(irq_ptr, cdev); | |
1176 | ||
1177 | /* cleanup subchannel */ | |
1178 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1179 | ||
1180 | if (how & QDIO_FLAG_CLEANUP_USING_CLEAR) | |
1181 | rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP); | |
1182 | else | |
1183 | /* default behaviour is halt */ | |
1184 | rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP); | |
1185 | if (rc) { | |
22f99347 JG |
1186 | DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no); |
1187 | DBF_ERROR("rc:%4d", rc); | |
779e6e1c JG |
1188 | goto no_cleanup; |
1189 | } | |
1190 | ||
1191 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP); | |
1192 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1193 | wait_event_interruptible_timeout(cdev->private->wait_q, | |
1194 | irq_ptr->state == QDIO_IRQ_STATE_INACTIVE || | |
1195 | irq_ptr->state == QDIO_IRQ_STATE_ERR, | |
1196 | 10 * HZ); | |
1197 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1198 | ||
1199 | no_cleanup: | |
1200 | qdio_shutdown_thinint(irq_ptr); | |
1201 | ||
1202 | /* restore interrupt handler */ | |
1203 | if ((void *)cdev->handler == (void *)qdio_int_handler) | |
1204 | cdev->handler = irq_ptr->orig_handler; | |
1205 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1206 | ||
1207 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1208 | mutex_unlock(&irq_ptr->setup_mutex); | |
779e6e1c JG |
1209 | if (rc) |
1210 | return rc; | |
1211 | return 0; | |
1212 | } | |
1213 | EXPORT_SYMBOL_GPL(qdio_shutdown); | |
1214 | ||
1215 | /** | |
1216 | * qdio_free - free data structures for a qdio subchannel | |
1217 | * @cdev: associated ccw device | |
1218 | */ | |
1219 | int qdio_free(struct ccw_device *cdev) | |
1220 | { | |
22f99347 | 1221 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
58eb27cd | 1222 | |
779e6e1c JG |
1223 | if (!irq_ptr) |
1224 | return -ENODEV; | |
1225 | ||
22f99347 | 1226 | DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no); |
779e6e1c | 1227 | mutex_lock(&irq_ptr->setup_mutex); |
22f99347 JG |
1228 | |
1229 | if (irq_ptr->debug_area != NULL) { | |
1230 | debug_unregister(irq_ptr->debug_area); | |
1231 | irq_ptr->debug_area = NULL; | |
1232 | } | |
779e6e1c JG |
1233 | cdev->private->qdio_data = NULL; |
1234 | mutex_unlock(&irq_ptr->setup_mutex); | |
1235 | ||
1236 | qdio_release_memory(irq_ptr); | |
1237 | return 0; | |
1238 | } | |
1239 | EXPORT_SYMBOL_GPL(qdio_free); | |
1240 | ||
1241 | /** | |
1242 | * qdio_initialize - allocate and establish queues for a qdio subchannel | |
1243 | * @init_data: initialization data | |
1244 | * | |
1245 | * This function first allocates queues via qdio_allocate() and on success | |
1246 | * establishes them via qdio_establish(). | |
1247 | */ | |
1248 | int qdio_initialize(struct qdio_initialize *init_data) | |
1249 | { | |
1250 | int rc; | |
779e6e1c JG |
1251 | |
1252 | rc = qdio_allocate(init_data); | |
1253 | if (rc) | |
1254 | return rc; | |
1255 | ||
1256 | rc = qdio_establish(init_data); | |
1257 | if (rc) | |
1258 | qdio_free(init_data->cdev); | |
1259 | return rc; | |
1260 | } | |
1261 | EXPORT_SYMBOL_GPL(qdio_initialize); | |
1262 | ||
1263 | /** | |
1264 | * qdio_allocate - allocate qdio queues and associated data | |
1265 | * @init_data: initialization data | |
1266 | */ | |
1267 | int qdio_allocate(struct qdio_initialize *init_data) | |
1268 | { | |
1269 | struct qdio_irq *irq_ptr; | |
779e6e1c | 1270 | |
22f99347 | 1271 | DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no); |
779e6e1c JG |
1272 | |
1273 | if ((init_data->no_input_qs && !init_data->input_handler) || | |
1274 | (init_data->no_output_qs && !init_data->output_handler)) | |
1275 | return -EINVAL; | |
1276 | ||
1277 | if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) || | |
1278 | (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)) | |
1279 | return -EINVAL; | |
1280 | ||
1281 | if ((!init_data->input_sbal_addr_array) || | |
1282 | (!init_data->output_sbal_addr_array)) | |
1283 | return -EINVAL; | |
1284 | ||
779e6e1c JG |
1285 | /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */ |
1286 | irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
1287 | if (!irq_ptr) | |
1288 | goto out_err; | |
779e6e1c JG |
1289 | |
1290 | mutex_init(&irq_ptr->setup_mutex); | |
22f99347 | 1291 | qdio_allocate_dbf(init_data, irq_ptr); |
779e6e1c JG |
1292 | |
1293 | /* | |
1294 | * Allocate a page for the chsc calls in qdio_establish. | |
1295 | * Must be pre-allocated since a zfcp recovery will call | |
1296 | * qdio_establish. In case of low memory and swap on a zfcp disk | |
1297 | * we may not be able to allocate memory otherwise. | |
1298 | */ | |
1299 | irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL); | |
1300 | if (!irq_ptr->chsc_page) | |
1301 | goto out_rel; | |
1302 | ||
1303 | /* qdr is used in ccw1.cda which is u32 */ | |
3b8e3004 | 1304 | irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
779e6e1c JG |
1305 | if (!irq_ptr->qdr) |
1306 | goto out_rel; | |
1307 | WARN_ON((unsigned long)irq_ptr->qdr & 0xfff); | |
1308 | ||
779e6e1c JG |
1309 | if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs, |
1310 | init_data->no_output_qs)) | |
1311 | goto out_rel; | |
1312 | ||
1313 | init_data->cdev->private->qdio_data = irq_ptr; | |
1314 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1315 | return 0; | |
1316 | out_rel: | |
1317 | qdio_release_memory(irq_ptr); | |
1318 | out_err: | |
1319 | return -ENOMEM; | |
1320 | } | |
1321 | EXPORT_SYMBOL_GPL(qdio_allocate); | |
1322 | ||
1323 | /** | |
1324 | * qdio_establish - establish queues on a qdio subchannel | |
1325 | * @init_data: initialization data | |
1326 | */ | |
1327 | int qdio_establish(struct qdio_initialize *init_data) | |
1328 | { | |
779e6e1c JG |
1329 | struct qdio_irq *irq_ptr; |
1330 | struct ccw_device *cdev = init_data->cdev; | |
1331 | unsigned long saveflags; | |
1332 | int rc; | |
1333 | ||
22f99347 | 1334 | DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no); |
58eb27cd | 1335 | |
779e6e1c JG |
1336 | irq_ptr = cdev->private->qdio_data; |
1337 | if (!irq_ptr) | |
1338 | return -ENODEV; | |
1339 | ||
1340 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1341 | return -EINVAL; | |
1342 | ||
779e6e1c JG |
1343 | mutex_lock(&irq_ptr->setup_mutex); |
1344 | qdio_setup_irq(init_data); | |
1345 | ||
1346 | rc = qdio_establish_thinint(irq_ptr); | |
1347 | if (rc) { | |
1348 | mutex_unlock(&irq_ptr->setup_mutex); | |
1349 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1350 | return rc; | |
1351 | } | |
1352 | ||
1353 | /* establish q */ | |
1354 | irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd; | |
1355 | irq_ptr->ccw.flags = CCW_FLAG_SLI; | |
1356 | irq_ptr->ccw.count = irq_ptr->equeue.count; | |
1357 | irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr); | |
1358 | ||
1359 | spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); | |
1360 | ccw_device_set_options_mask(cdev, 0); | |
1361 | ||
1362 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0); | |
1363 | if (rc) { | |
22f99347 JG |
1364 | DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no); |
1365 | DBF_ERROR("rc:%4x", rc); | |
779e6e1c JG |
1366 | } |
1367 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); | |
1368 | ||
1369 | if (rc) { | |
1370 | mutex_unlock(&irq_ptr->setup_mutex); | |
1371 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1372 | return rc; | |
1373 | } | |
1374 | ||
1375 | wait_event_interruptible_timeout(cdev->private->wait_q, | |
1376 | irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED || | |
1377 | irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ); | |
1378 | ||
1379 | if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) { | |
1380 | mutex_unlock(&irq_ptr->setup_mutex); | |
1381 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1382 | return -EIO; | |
1383 | } | |
1384 | ||
1385 | qdio_setup_ssqd_info(irq_ptr); | |
22f99347 JG |
1386 | DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc); |
1387 | DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac); | |
779e6e1c JG |
1388 | |
1389 | /* qebsm is now setup if available, initialize buffer states */ | |
1390 | qdio_init_buf_states(irq_ptr); | |
1391 | ||
1392 | mutex_unlock(&irq_ptr->setup_mutex); | |
1393 | qdio_print_subchannel_info(irq_ptr, cdev); | |
1394 | qdio_setup_debug_entries(irq_ptr, cdev); | |
1395 | return 0; | |
1396 | } | |
1397 | EXPORT_SYMBOL_GPL(qdio_establish); | |
1398 | ||
1399 | /** | |
1400 | * qdio_activate - activate queues on a qdio subchannel | |
1401 | * @cdev: associated cdev | |
1402 | */ | |
1403 | int qdio_activate(struct ccw_device *cdev) | |
1404 | { | |
1405 | struct qdio_irq *irq_ptr; | |
1406 | int rc; | |
1407 | unsigned long saveflags; | |
779e6e1c | 1408 | |
22f99347 | 1409 | DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no); |
58eb27cd | 1410 | |
779e6e1c JG |
1411 | irq_ptr = cdev->private->qdio_data; |
1412 | if (!irq_ptr) | |
1413 | return -ENODEV; | |
1414 | ||
1415 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1416 | return -EINVAL; | |
1417 | ||
1418 | mutex_lock(&irq_ptr->setup_mutex); | |
1419 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { | |
1420 | rc = -EBUSY; | |
1421 | goto out; | |
1422 | } | |
1423 | ||
779e6e1c JG |
1424 | irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd; |
1425 | irq_ptr->ccw.flags = CCW_FLAG_SLI; | |
1426 | irq_ptr->ccw.count = irq_ptr->aqueue.count; | |
1427 | irq_ptr->ccw.cda = 0; | |
1428 | ||
1429 | spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); | |
1430 | ccw_device_set_options(cdev, CCWDEV_REPORT_ALL); | |
1431 | ||
1432 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE, | |
1433 | 0, DOIO_DENY_PREFETCH); | |
1434 | if (rc) { | |
22f99347 JG |
1435 | DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no); |
1436 | DBF_ERROR("rc:%4x", rc); | |
779e6e1c JG |
1437 | } |
1438 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); | |
1439 | ||
1440 | if (rc) | |
1441 | goto out; | |
1442 | ||
1443 | if (is_thinint_irq(irq_ptr)) | |
1444 | tiqdio_add_input_queues(irq_ptr); | |
1445 | ||
1446 | /* wait for subchannel to become active */ | |
1447 | msleep(5); | |
1448 | ||
1449 | switch (irq_ptr->state) { | |
1450 | case QDIO_IRQ_STATE_STOPPED: | |
1451 | case QDIO_IRQ_STATE_ERR: | |
1452 | mutex_unlock(&irq_ptr->setup_mutex); | |
1453 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1454 | return -EIO; | |
1455 | default: | |
1456 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE); | |
1457 | rc = 0; | |
1458 | } | |
1459 | out: | |
1460 | mutex_unlock(&irq_ptr->setup_mutex); | |
1461 | return rc; | |
1462 | } | |
1463 | EXPORT_SYMBOL_GPL(qdio_activate); | |
1464 | ||
1465 | static inline int buf_in_between(int bufnr, int start, int count) | |
1466 | { | |
1467 | int end = add_buf(start, count); | |
1468 | ||
1469 | if (end > start) { | |
1470 | if (bufnr >= start && bufnr < end) | |
1471 | return 1; | |
1472 | else | |
1473 | return 0; | |
1474 | } | |
1475 | ||
1476 | /* wrap-around case */ | |
1477 | if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) || | |
1478 | (bufnr < end)) | |
1479 | return 1; | |
1480 | else | |
1481 | return 0; | |
1482 | } | |
1483 | ||
1484 | /** | |
1485 | * handle_inbound - reset processed input buffers | |
1486 | * @q: queue containing the buffers | |
1487 | * @callflags: flags | |
1488 | * @bufnr: first buffer to process | |
1489 | * @count: how many buffers are emptied | |
1490 | */ | |
1491 | static void handle_inbound(struct qdio_q *q, unsigned int callflags, | |
1492 | int bufnr, int count) | |
1493 | { | |
50f769df | 1494 | int used, rc, diff; |
779e6e1c | 1495 | |
50f769df JG |
1496 | if (!q->u.in.polling) |
1497 | goto set; | |
1498 | ||
1499 | /* protect against stop polling setting an ACK for an emptied slsb */ | |
1500 | if (count == QDIO_MAX_BUFFERS_PER_Q) { | |
1501 | /* overwriting everything, just delete polling status */ | |
1502 | q->u.in.polling = 0; | |
1503 | q->u.in.ack_count = 0; | |
1504 | goto set; | |
1505 | } else if (buf_in_between(q->last_move_ftc, bufnr, count)) { | |
1506 | if (is_qebsm(q)) { | |
1507 | /* partial overwrite, just update last_move_ftc */ | |
1508 | diff = add_buf(bufnr, count); | |
1509 | diff = sub_buf(diff, q->last_move_ftc); | |
1510 | q->u.in.ack_count -= diff; | |
1511 | if (q->u.in.ack_count <= 0) { | |
1512 | q->u.in.polling = 0; | |
1513 | q->u.in.ack_count = 0; | |
1514 | /* TODO: must we set last_move_ftc to something meaningful? */ | |
1515 | goto set; | |
1516 | } | |
1517 | q->last_move_ftc = add_buf(q->last_move_ftc, diff); | |
1518 | } | |
1519 | else | |
1520 | /* the only ACK will be deleted, so stop polling */ | |
779e6e1c | 1521 | q->u.in.polling = 0; |
50f769df | 1522 | } |
779e6e1c | 1523 | |
50f769df | 1524 | set: |
779e6e1c | 1525 | count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count); |
779e6e1c JG |
1526 | |
1527 | used = atomic_add_return(count, &q->nr_buf_used) - count; | |
1528 | BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q); | |
1529 | ||
1530 | /* no need to signal as long as the adapter had free buffers */ | |
1531 | if (used) | |
1532 | return; | |
1533 | ||
1534 | if (need_siga_in(q)) { | |
1535 | rc = qdio_siga_input(q); | |
1536 | if (rc) | |
1537 | q->qdio_error = rc; | |
1538 | } | |
1539 | } | |
1540 | ||
1541 | /** | |
1542 | * handle_outbound - process filled outbound buffers | |
1543 | * @q: queue containing the buffers | |
1544 | * @callflags: flags | |
1545 | * @bufnr: first buffer to process | |
1546 | * @count: how many buffers are filled | |
1547 | */ | |
1548 | static void handle_outbound(struct qdio_q *q, unsigned int callflags, | |
1549 | int bufnr, int count) | |
1550 | { | |
1551 | unsigned char state; | |
1552 | int used; | |
1553 | ||
1554 | qdio_perf_stat_inc(&perf_stats.outbound_handler); | |
1555 | ||
1556 | count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count); | |
1557 | used = atomic_add_return(count, &q->nr_buf_used); | |
1558 | BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q); | |
1559 | ||
1560 | if (callflags & QDIO_FLAG_PCI_OUT) | |
1561 | q->u.out.pci_out_enabled = 1; | |
1562 | else | |
1563 | q->u.out.pci_out_enabled = 0; | |
1564 | ||
1565 | if (queue_type(q) == QDIO_IQDIO_QFMT) { | |
1566 | if (multicast_outbound(q)) | |
1567 | qdio_kick_outbound_q(q); | |
1568 | else | |
7a0f4755 KDW |
1569 | if ((q->irq_ptr->ssqd_desc.mmwc > 1) && |
1570 | (count > 1) && | |
1571 | (count <= q->irq_ptr->ssqd_desc.mmwc)) { | |
1572 | /* exploit enhanced SIGA */ | |
1573 | q->u.out.use_enh_siga = 1; | |
779e6e1c | 1574 | qdio_kick_outbound_q(q); |
7a0f4755 KDW |
1575 | } else { |
1576 | /* | |
1577 | * One siga-w per buffer required for unicast | |
1578 | * HiperSockets. | |
1579 | */ | |
1580 | q->u.out.use_enh_siga = 0; | |
1581 | while (count--) | |
1582 | qdio_kick_outbound_q(q); | |
1583 | } | |
779e6e1c JG |
1584 | goto out; |
1585 | } | |
1586 | ||
1587 | if (need_siga_sync(q)) { | |
1588 | qdio_siga_sync_q(q); | |
1589 | goto out; | |
1590 | } | |
1591 | ||
1592 | /* try to fast requeue buffers */ | |
50f769df | 1593 | get_buf_state(q, prev_buf(bufnr), &state, 0); |
779e6e1c JG |
1594 | if (state != SLSB_CU_OUTPUT_PRIMED) |
1595 | qdio_kick_outbound_q(q); | |
1596 | else { | |
22f99347 | 1597 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "fast-req"); |
779e6e1c JG |
1598 | qdio_perf_stat_inc(&perf_stats.fast_requeue); |
1599 | } | |
1600 | out: | |
1601 | /* Fixme: could wait forever if called from process context */ | |
1602 | tasklet_schedule(&q->tasklet); | |
1603 | } | |
1604 | ||
1605 | /** | |
1606 | * do_QDIO - process input or output buffers | |
1607 | * @cdev: associated ccw_device for the qdio subchannel | |
1608 | * @callflags: input or output and special flags from the program | |
1609 | * @q_nr: queue number | |
1610 | * @bufnr: buffer number | |
1611 | * @count: how many buffers to process | |
1612 | */ | |
1613 | int do_QDIO(struct ccw_device *cdev, unsigned int callflags, | |
1614 | int q_nr, int bufnr, int count) | |
1615 | { | |
1616 | struct qdio_irq *irq_ptr; | |
779e6e1c JG |
1617 | |
1618 | if ((bufnr > QDIO_MAX_BUFFERS_PER_Q) || | |
1619 | (count > QDIO_MAX_BUFFERS_PER_Q) || | |
1620 | (q_nr > QDIO_MAX_QUEUES_PER_IRQ)) | |
1621 | return -EINVAL; | |
1622 | ||
1623 | if (!count) | |
1624 | return 0; | |
1625 | ||
1626 | irq_ptr = cdev->private->qdio_data; | |
1627 | if (!irq_ptr) | |
1628 | return -ENODEV; | |
1629 | ||
779e6e1c | 1630 | if (callflags & QDIO_FLAG_SYNC_INPUT) |
22f99347 | 1631 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "doQDIO input"); |
779e6e1c | 1632 | else |
22f99347 JG |
1633 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "doQDIO output"); |
1634 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "q:%1d flag:%4x", q_nr, callflags); | |
1635 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "buf:%2d cnt:%3d", bufnr, count); | |
779e6e1c JG |
1636 | |
1637 | if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE) | |
1638 | return -EBUSY; | |
1639 | ||
1640 | if (callflags & QDIO_FLAG_SYNC_INPUT) | |
22f99347 JG |
1641 | handle_inbound(irq_ptr->input_qs[q_nr], callflags, bufnr, |
1642 | count); | |
779e6e1c | 1643 | else if (callflags & QDIO_FLAG_SYNC_OUTPUT) |
22f99347 JG |
1644 | handle_outbound(irq_ptr->output_qs[q_nr], callflags, bufnr, |
1645 | count); | |
1646 | else | |
779e6e1c | 1647 | return -EINVAL; |
779e6e1c JG |
1648 | return 0; |
1649 | } | |
1650 | EXPORT_SYMBOL_GPL(do_QDIO); | |
1651 | ||
1652 | static int __init init_QDIO(void) | |
1653 | { | |
1654 | int rc; | |
1655 | ||
1656 | rc = qdio_setup_init(); | |
1657 | if (rc) | |
1658 | return rc; | |
1659 | rc = tiqdio_allocate_memory(); | |
1660 | if (rc) | |
1661 | goto out_cache; | |
1662 | rc = qdio_debug_init(); | |
1663 | if (rc) | |
1664 | goto out_ti; | |
1665 | rc = qdio_setup_perf_stats(); | |
1666 | if (rc) | |
1667 | goto out_debug; | |
1668 | rc = tiqdio_register_thinints(); | |
1669 | if (rc) | |
1670 | goto out_perf; | |
1671 | return 0; | |
1672 | ||
1673 | out_perf: | |
1674 | qdio_remove_perf_stats(); | |
1675 | out_debug: | |
1676 | qdio_debug_exit(); | |
1677 | out_ti: | |
1678 | tiqdio_free_memory(); | |
1679 | out_cache: | |
1680 | qdio_setup_exit(); | |
1681 | return rc; | |
1682 | } | |
1683 | ||
1684 | static void __exit exit_QDIO(void) | |
1685 | { | |
1686 | tiqdio_unregister_thinints(); | |
1687 | tiqdio_free_memory(); | |
1688 | qdio_remove_perf_stats(); | |
1689 | qdio_debug_exit(); | |
1690 | qdio_setup_exit(); | |
1691 | } | |
1692 | ||
1693 | module_init(init_QDIO); | |
1694 | module_exit(exit_QDIO); |