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> | |
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" | |
779e6e1c JG |
25 | |
26 | MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\ | |
27 | "Jan Glauber <jang@linux.vnet.ibm.com>"); | |
28 | MODULE_DESCRIPTION("QDIO base support"); | |
29 | MODULE_LICENSE("GPL"); | |
30 | ||
31 | static inline int do_siga_sync(struct subchannel_id schid, | |
32 | unsigned int out_mask, unsigned int in_mask) | |
33 | { | |
34 | register unsigned long __fc asm ("0") = 2; | |
35 | register struct subchannel_id __schid asm ("1") = schid; | |
36 | register unsigned long out asm ("2") = out_mask; | |
37 | register unsigned long in asm ("3") = in_mask; | |
38 | int cc; | |
39 | ||
40 | asm volatile( | |
41 | " siga 0\n" | |
42 | " ipm %0\n" | |
43 | " srl %0,28\n" | |
44 | : "=d" (cc) | |
45 | : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc"); | |
46 | return cc; | |
47 | } | |
48 | ||
49 | static inline int do_siga_input(struct subchannel_id schid, unsigned int mask) | |
50 | { | |
51 | register unsigned long __fc asm ("0") = 1; | |
52 | register struct subchannel_id __schid asm ("1") = schid; | |
53 | register unsigned long __mask asm ("2") = mask; | |
54 | int cc; | |
55 | ||
56 | asm volatile( | |
57 | " siga 0\n" | |
58 | " ipm %0\n" | |
59 | " srl %0,28\n" | |
60 | : "=d" (cc) | |
61 | : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory"); | |
62 | return cc; | |
63 | } | |
64 | ||
65 | /** | |
66 | * do_siga_output - perform SIGA-w/wt function | |
67 | * @schid: subchannel id or in case of QEBSM the subchannel token | |
68 | * @mask: which output queues to process | |
69 | * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer | |
70 | * @fc: function code to perform | |
71 | * | |
72 | * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION. | |
73 | * Note: For IQDC unicast queues only the highest priority queue is processed. | |
74 | */ | |
75 | static inline int do_siga_output(unsigned long schid, unsigned long mask, | |
7a0b4cbc | 76 | unsigned int *bb, unsigned int fc) |
779e6e1c JG |
77 | { |
78 | register unsigned long __fc asm("0") = fc; | |
79 | register unsigned long __schid asm("1") = schid; | |
80 | register unsigned long __mask asm("2") = mask; | |
81 | int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION; | |
82 | ||
83 | asm volatile( | |
84 | " siga 0\n" | |
85 | "0: ipm %0\n" | |
86 | " srl %0,28\n" | |
87 | "1:\n" | |
88 | EX_TABLE(0b, 1b) | |
89 | : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask) | |
90 | : : "cc", "memory"); | |
91 | *bb = ((unsigned int) __fc) >> 31; | |
92 | return cc; | |
93 | } | |
94 | ||
95 | static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq) | |
96 | { | |
779e6e1c JG |
97 | /* all done or next buffer state different */ |
98 | if (ccq == 0 || ccq == 32) | |
99 | return 0; | |
100 | /* not all buffers processed */ | |
101 | if (ccq == 96 || ccq == 97) | |
102 | return 1; | |
103 | /* notify devices immediately */ | |
22f99347 | 104 | DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq); |
779e6e1c JG |
105 | return -EIO; |
106 | } | |
107 | ||
108 | /** | |
109 | * qdio_do_eqbs - extract buffer states for QEBSM | |
110 | * @q: queue to manipulate | |
111 | * @state: state of the extracted buffers | |
112 | * @start: buffer number to start at | |
113 | * @count: count of buffers to examine | |
50f769df | 114 | * @auto_ack: automatically acknowledge buffers |
779e6e1c | 115 | * |
73ac36ea | 116 | * Returns the number of successfully extracted equal buffer states. |
779e6e1c JG |
117 | * Stops processing if a state is different from the last buffers state. |
118 | */ | |
119 | static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state, | |
50f769df | 120 | int start, int count, int auto_ack) |
779e6e1c JG |
121 | { |
122 | unsigned int ccq = 0; | |
123 | int tmp_count = count, tmp_start = start; | |
124 | int nr = q->nr; | |
125 | int rc; | |
779e6e1c JG |
126 | |
127 | BUG_ON(!q->irq_ptr->sch_token); | |
6486cda6 | 128 | qperf_inc(q, eqbs); |
779e6e1c JG |
129 | |
130 | if (!q->is_input_q) | |
131 | nr += q->irq_ptr->nr_input_qs; | |
132 | again: | |
50f769df JG |
133 | ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count, |
134 | auto_ack); | |
779e6e1c JG |
135 | rc = qdio_check_ccq(q, ccq); |
136 | ||
137 | /* At least one buffer was processed, return and extract the remaining | |
138 | * buffers later. | |
139 | */ | |
23589d05 | 140 | if ((ccq == 96) && (count != tmp_count)) { |
6486cda6 | 141 | qperf_inc(q, eqbs_partial); |
779e6e1c | 142 | return (count - tmp_count); |
23589d05 | 143 | } |
22f99347 | 144 | |
779e6e1c | 145 | if (rc == 1) { |
22f99347 | 146 | DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq); |
779e6e1c JG |
147 | goto again; |
148 | } | |
149 | ||
150 | if (rc < 0) { | |
22f99347 JG |
151 | DBF_ERROR("%4x EQBS ERROR", SCH_NO(q)); |
152 | DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); | |
779e6e1c JG |
153 | q->handler(q->irq_ptr->cdev, |
154 | QDIO_ERROR_ACTIVATE_CHECK_CONDITION, | |
155 | 0, -1, -1, q->irq_ptr->int_parm); | |
156 | return 0; | |
157 | } | |
158 | return count - tmp_count; | |
159 | } | |
160 | ||
161 | /** | |
162 | * qdio_do_sqbs - set buffer states for QEBSM | |
163 | * @q: queue to manipulate | |
164 | * @state: new state of the buffers | |
165 | * @start: first buffer number to change | |
166 | * @count: how many buffers to change | |
167 | * | |
168 | * Returns the number of successfully changed buffers. | |
169 | * Does retrying until the specified count of buffer states is set or an | |
170 | * error occurs. | |
171 | */ | |
172 | static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start, | |
173 | int count) | |
174 | { | |
175 | unsigned int ccq = 0; | |
176 | int tmp_count = count, tmp_start = start; | |
177 | int nr = q->nr; | |
178 | int rc; | |
779e6e1c | 179 | |
50f769df JG |
180 | if (!count) |
181 | return 0; | |
182 | ||
779e6e1c | 183 | BUG_ON(!q->irq_ptr->sch_token); |
6486cda6 | 184 | qperf_inc(q, sqbs); |
779e6e1c JG |
185 | |
186 | if (!q->is_input_q) | |
187 | nr += q->irq_ptr->nr_input_qs; | |
188 | again: | |
189 | ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count); | |
190 | rc = qdio_check_ccq(q, ccq); | |
191 | if (rc == 1) { | |
22f99347 | 192 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq); |
6486cda6 | 193 | qperf_inc(q, sqbs_partial); |
779e6e1c JG |
194 | goto again; |
195 | } | |
196 | if (rc < 0) { | |
22f99347 JG |
197 | DBF_ERROR("%4x SQBS ERROR", SCH_NO(q)); |
198 | DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); | |
779e6e1c JG |
199 | q->handler(q->irq_ptr->cdev, |
200 | QDIO_ERROR_ACTIVATE_CHECK_CONDITION, | |
201 | 0, -1, -1, q->irq_ptr->int_parm); | |
202 | return 0; | |
203 | } | |
204 | WARN_ON(tmp_count); | |
205 | return count - tmp_count; | |
206 | } | |
207 | ||
208 | /* returns number of examined buffers and their common state in *state */ | |
209 | static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr, | |
50f769df JG |
210 | unsigned char *state, unsigned int count, |
211 | int auto_ack) | |
779e6e1c JG |
212 | { |
213 | unsigned char __state = 0; | |
214 | int i; | |
215 | ||
216 | BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK); | |
217 | BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q); | |
218 | ||
219 | if (is_qebsm(q)) | |
50f769df | 220 | return qdio_do_eqbs(q, state, bufnr, count, auto_ack); |
779e6e1c JG |
221 | |
222 | for (i = 0; i < count; i++) { | |
223 | if (!__state) | |
224 | __state = q->slsb.val[bufnr]; | |
225 | else if (q->slsb.val[bufnr] != __state) | |
226 | break; | |
227 | bufnr = next_buf(bufnr); | |
228 | } | |
229 | *state = __state; | |
230 | return i; | |
231 | } | |
232 | ||
60b5df2f JG |
233 | static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr, |
234 | unsigned char *state, int auto_ack) | |
779e6e1c | 235 | { |
50f769df | 236 | return get_buf_states(q, bufnr, state, 1, auto_ack); |
779e6e1c JG |
237 | } |
238 | ||
239 | /* wrap-around safe setting of slsb states, returns number of changed buffers */ | |
240 | static inline int set_buf_states(struct qdio_q *q, int bufnr, | |
241 | unsigned char state, int count) | |
242 | { | |
243 | int i; | |
244 | ||
245 | BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK); | |
246 | BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q); | |
247 | ||
248 | if (is_qebsm(q)) | |
249 | return qdio_do_sqbs(q, state, bufnr, count); | |
250 | ||
251 | for (i = 0; i < count; i++) { | |
252 | xchg(&q->slsb.val[bufnr], state); | |
253 | bufnr = next_buf(bufnr); | |
254 | } | |
255 | return count; | |
256 | } | |
257 | ||
258 | static inline int set_buf_state(struct qdio_q *q, int bufnr, | |
259 | unsigned char state) | |
260 | { | |
261 | return set_buf_states(q, bufnr, state, 1); | |
262 | } | |
263 | ||
264 | /* set slsb states to initial state */ | |
265 | void qdio_init_buf_states(struct qdio_irq *irq_ptr) | |
266 | { | |
267 | struct qdio_q *q; | |
268 | int i; | |
269 | ||
270 | for_each_input_queue(irq_ptr, q, i) | |
271 | set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT, | |
272 | QDIO_MAX_BUFFERS_PER_Q); | |
273 | for_each_output_queue(irq_ptr, q, i) | |
274 | set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT, | |
275 | QDIO_MAX_BUFFERS_PER_Q); | |
276 | } | |
277 | ||
60b5df2f | 278 | static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output, |
779e6e1c JG |
279 | unsigned int input) |
280 | { | |
281 | int cc; | |
282 | ||
283 | if (!need_siga_sync(q)) | |
284 | return 0; | |
285 | ||
7a0b4cbc | 286 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr); |
6486cda6 | 287 | qperf_inc(q, siga_sync); |
779e6e1c JG |
288 | |
289 | cc = do_siga_sync(q->irq_ptr->schid, output, input); | |
22f99347 JG |
290 | if (cc) |
291 | DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc); | |
779e6e1c JG |
292 | return cc; |
293 | } | |
294 | ||
60b5df2f | 295 | static inline int qdio_siga_sync_q(struct qdio_q *q) |
779e6e1c JG |
296 | { |
297 | if (q->is_input_q) | |
298 | return qdio_siga_sync(q, 0, q->mask); | |
299 | else | |
300 | return qdio_siga_sync(q, q->mask, 0); | |
301 | } | |
302 | ||
303 | static inline int qdio_siga_sync_out(struct qdio_q *q) | |
304 | { | |
305 | return qdio_siga_sync(q, ~0U, 0); | |
306 | } | |
307 | ||
308 | static inline int qdio_siga_sync_all(struct qdio_q *q) | |
309 | { | |
310 | return qdio_siga_sync(q, ~0U, ~0U); | |
311 | } | |
312 | ||
7a0b4cbc | 313 | static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit) |
779e6e1c | 314 | { |
779e6e1c | 315 | unsigned long schid; |
7a0b4cbc JG |
316 | unsigned int fc = 0; |
317 | u64 start_time = 0; | |
318 | int cc; | |
779e6e1c | 319 | |
7a0b4cbc | 320 | if (q->u.out.use_enh_siga) |
7a0f4755 | 321 | fc = 3; |
7a0b4cbc JG |
322 | |
323 | if (is_qebsm(q)) { | |
779e6e1c JG |
324 | schid = q->irq_ptr->sch_token; |
325 | fc |= 0x80; | |
326 | } | |
7a0b4cbc JG |
327 | else |
328 | schid = *((u32 *)&q->irq_ptr->schid); | |
779e6e1c | 329 | |
779e6e1c | 330 | again: |
7a0b4cbc JG |
331 | cc = do_siga_output(schid, q->mask, busy_bit, fc); |
332 | ||
333 | /* hipersocket busy condition */ | |
334 | if (*busy_bit) { | |
335 | WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2); | |
58eb27cd | 336 | |
7a0b4cbc | 337 | if (!start_time) { |
779e6e1c | 338 | start_time = get_usecs(); |
7a0b4cbc JG |
339 | goto again; |
340 | } | |
341 | if ((get_usecs() - start_time) < QDIO_BUSY_BIT_PATIENCE) | |
779e6e1c JG |
342 | goto again; |
343 | } | |
779e6e1c JG |
344 | return cc; |
345 | } | |
346 | ||
347 | static inline int qdio_siga_input(struct qdio_q *q) | |
348 | { | |
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 JG |
353 | |
354 | cc = do_siga_input(q->irq_ptr->schid, q->mask); | |
355 | if (cc) | |
22f99347 | 356 | DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc); |
779e6e1c JG |
357 | return cc; |
358 | } | |
359 | ||
60b5df2f | 360 | static inline void qdio_sync_after_thinint(struct qdio_q *q) |
779e6e1c JG |
361 | { |
362 | if (pci_out_supported(q)) { | |
363 | if (need_siga_sync_thinint(q)) | |
364 | qdio_siga_sync_all(q); | |
365 | else if (need_siga_sync_out_thinint(q)) | |
366 | qdio_siga_sync_out(q); | |
367 | } else | |
368 | qdio_siga_sync_q(q); | |
369 | } | |
370 | ||
60b5df2f JG |
371 | int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr, |
372 | unsigned char *state) | |
373 | { | |
374 | qdio_siga_sync_q(q); | |
375 | return get_buf_states(q, bufnr, state, 1, 0); | |
376 | } | |
377 | ||
378 | static inline void qdio_stop_polling(struct qdio_q *q) | |
779e6e1c | 379 | { |
50f769df | 380 | if (!q->u.in.polling) |
779e6e1c | 381 | return; |
50f769df | 382 | |
779e6e1c | 383 | q->u.in.polling = 0; |
6486cda6 | 384 | qperf_inc(q, stop_polling); |
779e6e1c JG |
385 | |
386 | /* show the card that we are not polling anymore */ | |
50f769df | 387 | if (is_qebsm(q)) { |
e85dea0e | 388 | set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, |
50f769df JG |
389 | q->u.in.ack_count); |
390 | q->u.in.ack_count = 0; | |
391 | } else | |
e85dea0e | 392 | set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); |
779e6e1c JG |
393 | } |
394 | ||
50f769df | 395 | static void announce_buffer_error(struct qdio_q *q, int count) |
779e6e1c | 396 | { |
7a0b4cbc | 397 | q->qdio_error |= QDIO_ERROR_SLSB_STATE; |
50f769df JG |
398 | |
399 | /* special handling for no target buffer empty */ | |
400 | if ((!q->is_input_q && | |
401 | (q->sbal[q->first_to_check]->element[15].flags & 0xff) == 0x10)) { | |
6486cda6 | 402 | qperf_inc(q, target_full); |
1d7e1500 | 403 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", |
50f769df JG |
404 | q->first_to_check); |
405 | return; | |
406 | } | |
407 | ||
22f99347 JG |
408 | DBF_ERROR("%4x BUF ERROR", SCH_NO(q)); |
409 | DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr); | |
50f769df | 410 | DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count); |
22f99347 JG |
411 | DBF_ERROR("F14:%2x F15:%2x", |
412 | q->sbal[q->first_to_check]->element[14].flags & 0xff, | |
413 | q->sbal[q->first_to_check]->element[15].flags & 0xff); | |
50f769df | 414 | } |
779e6e1c | 415 | |
50f769df JG |
416 | static inline void inbound_primed(struct qdio_q *q, int count) |
417 | { | |
418 | int new; | |
419 | ||
1d7e1500 | 420 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count); |
50f769df JG |
421 | |
422 | /* for QEBSM the ACK was already set by EQBS */ | |
423 | if (is_qebsm(q)) { | |
424 | if (!q->u.in.polling) { | |
425 | q->u.in.polling = 1; | |
426 | q->u.in.ack_count = count; | |
e85dea0e | 427 | q->u.in.ack_start = q->first_to_check; |
50f769df JG |
428 | return; |
429 | } | |
430 | ||
431 | /* delete the previous ACK's */ | |
e85dea0e | 432 | set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, |
50f769df JG |
433 | q->u.in.ack_count); |
434 | q->u.in.ack_count = count; | |
e85dea0e | 435 | q->u.in.ack_start = q->first_to_check; |
50f769df JG |
436 | return; |
437 | } | |
438 | ||
439 | /* | |
440 | * ACK the newest buffer. The ACK will be removed in qdio_stop_polling | |
441 | * or by the next inbound run. | |
442 | */ | |
443 | new = add_buf(q->first_to_check, count - 1); | |
444 | if (q->u.in.polling) { | |
445 | /* reset the previous ACK but first set the new one */ | |
446 | set_buf_state(q, new, SLSB_P_INPUT_ACK); | |
e85dea0e | 447 | set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); |
3fdf1e18 | 448 | } else { |
50f769df | 449 | q->u.in.polling = 1; |
3fdf1e18 | 450 | set_buf_state(q, new, SLSB_P_INPUT_ACK); |
50f769df JG |
451 | } |
452 | ||
e85dea0e | 453 | q->u.in.ack_start = new; |
50f769df JG |
454 | count--; |
455 | if (!count) | |
456 | return; | |
6541f7b6 JG |
457 | /* need to change ALL buffers to get more interrupts */ |
458 | set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count); | |
779e6e1c JG |
459 | } |
460 | ||
461 | static int get_inbound_buffer_frontier(struct qdio_q *q) | |
462 | { | |
463 | int count, stop; | |
464 | unsigned char state; | |
465 | ||
779e6e1c JG |
466 | /* |
467 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved | |
468 | * would return 0. | |
469 | */ | |
470 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); | |
471 | stop = add_buf(q->first_to_check, count); | |
472 | ||
779e6e1c JG |
473 | if (q->first_to_check == stop) |
474 | goto out; | |
475 | ||
36e3e721 JG |
476 | /* |
477 | * No siga sync here, as a PCI or we after a thin interrupt | |
478 | * already sync'ed the queues. | |
479 | */ | |
50f769df | 480 | count = get_buf_states(q, q->first_to_check, &state, count, 1); |
779e6e1c JG |
481 | if (!count) |
482 | goto out; | |
483 | ||
484 | switch (state) { | |
485 | case SLSB_P_INPUT_PRIMED: | |
50f769df | 486 | inbound_primed(q, count); |
779e6e1c | 487 | q->first_to_check = add_buf(q->first_to_check, count); |
8bcd9b04 | 488 | if (atomic_sub(count, &q->nr_buf_used) == 0) |
6486cda6 | 489 | qperf_inc(q, inbound_queue_full); |
36e3e721 | 490 | break; |
779e6e1c | 491 | case SLSB_P_INPUT_ERROR: |
50f769df | 492 | announce_buffer_error(q, count); |
779e6e1c JG |
493 | /* process the buffer, the upper layer will take care of it */ |
494 | q->first_to_check = add_buf(q->first_to_check, count); | |
495 | atomic_sub(count, &q->nr_buf_used); | |
496 | break; | |
497 | case SLSB_CU_INPUT_EMPTY: | |
498 | case SLSB_P_INPUT_NOT_INIT: | |
499 | case SLSB_P_INPUT_ACK: | |
22f99347 | 500 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop"); |
779e6e1c JG |
501 | break; |
502 | default: | |
503 | BUG(); | |
504 | } | |
505 | out: | |
779e6e1c JG |
506 | return q->first_to_check; |
507 | } | |
508 | ||
60b5df2f | 509 | static int qdio_inbound_q_moved(struct qdio_q *q) |
779e6e1c JG |
510 | { |
511 | int bufnr; | |
512 | ||
513 | bufnr = get_inbound_buffer_frontier(q); | |
514 | ||
e85dea0e JG |
515 | if ((bufnr != q->last_move) || q->qdio_error) { |
516 | q->last_move = bufnr; | |
9a2c160a | 517 | if (!is_thinint_irq(q->irq_ptr) && !MACHINE_IS_VM) |
779e6e1c | 518 | q->u.in.timestamp = get_usecs(); |
779e6e1c JG |
519 | return 1; |
520 | } else | |
521 | return 0; | |
522 | } | |
523 | ||
9a2c160a | 524 | static inline int qdio_inbound_q_done(struct qdio_q *q) |
779e6e1c | 525 | { |
9a1ce28a | 526 | unsigned char state = 0; |
779e6e1c JG |
527 | |
528 | if (!atomic_read(&q->nr_buf_used)) | |
529 | return 1; | |
530 | ||
779e6e1c | 531 | qdio_siga_sync_q(q); |
50f769df | 532 | get_buf_state(q, q->first_to_check, &state, 0); |
9a2c160a | 533 | |
779e6e1c | 534 | if (state == SLSB_P_INPUT_PRIMED) |
9a2c160a | 535 | /* more work coming */ |
779e6e1c JG |
536 | return 0; |
537 | ||
9a2c160a JG |
538 | if (is_thinint_irq(q->irq_ptr)) |
539 | return 1; | |
540 | ||
541 | /* don't poll under z/VM */ | |
542 | if (MACHINE_IS_VM) | |
779e6e1c JG |
543 | return 1; |
544 | ||
545 | /* | |
546 | * At this point we know, that inbound first_to_check | |
547 | * has (probably) not moved (see qdio_inbound_processing). | |
548 | */ | |
549 | if (get_usecs() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) { | |
1d7e1500 | 550 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x", |
22f99347 | 551 | q->first_to_check); |
779e6e1c | 552 | return 1; |
9a2c160a | 553 | } else |
60b5df2f | 554 | return 0; |
60b5df2f JG |
555 | } |
556 | ||
557 | static void qdio_kick_handler(struct qdio_q *q) | |
779e6e1c | 558 | { |
9c8a08d7 JG |
559 | int start = q->first_to_kick; |
560 | int end = q->first_to_check; | |
561 | int count; | |
779e6e1c JG |
562 | |
563 | if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) | |
564 | return; | |
565 | ||
9c8a08d7 JG |
566 | count = sub_buf(end, start); |
567 | ||
568 | if (q->is_input_q) { | |
6486cda6 | 569 | qperf_inc(q, inbound_handler); |
1d7e1500 JG |
570 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count); |
571 | } else | |
6486cda6 | 572 | qperf_inc(q, outbound_handler); |
1d7e1500 JG |
573 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x", |
574 | start, count); | |
9c8a08d7 JG |
575 | |
576 | q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count, | |
577 | q->irq_ptr->int_parm); | |
779e6e1c JG |
578 | |
579 | /* for the next time */ | |
9c8a08d7 | 580 | q->first_to_kick = end; |
779e6e1c JG |
581 | q->qdio_error = 0; |
582 | } | |
583 | ||
584 | static void __qdio_inbound_processing(struct qdio_q *q) | |
585 | { | |
6486cda6 | 586 | qperf_inc(q, tasklet_inbound); |
779e6e1c JG |
587 | again: |
588 | if (!qdio_inbound_q_moved(q)) | |
589 | return; | |
590 | ||
9c8a08d7 | 591 | qdio_kick_handler(q); |
779e6e1c | 592 | |
6486cda6 | 593 | if (!qdio_inbound_q_done(q)) { |
779e6e1c | 594 | /* means poll time is not yet over */ |
6486cda6 | 595 | qperf_inc(q, tasklet_inbound_resched); |
779e6e1c | 596 | goto again; |
6486cda6 | 597 | } |
779e6e1c JG |
598 | |
599 | qdio_stop_polling(q); | |
600 | /* | |
601 | * We need to check again to not lose initiative after | |
602 | * resetting the ACK state. | |
603 | */ | |
6486cda6 JG |
604 | if (!qdio_inbound_q_done(q)) { |
605 | qperf_inc(q, tasklet_inbound_resched2); | |
779e6e1c | 606 | goto again; |
6486cda6 | 607 | } |
779e6e1c JG |
608 | } |
609 | ||
779e6e1c JG |
610 | void qdio_inbound_processing(unsigned long data) |
611 | { | |
612 | struct qdio_q *q = (struct qdio_q *)data; | |
613 | __qdio_inbound_processing(q); | |
614 | } | |
615 | ||
616 | static int get_outbound_buffer_frontier(struct qdio_q *q) | |
617 | { | |
618 | int count, stop; | |
619 | unsigned char state; | |
620 | ||
621 | if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) || | |
622 | (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q))) | |
623 | qdio_siga_sync_q(q); | |
624 | ||
625 | /* | |
626 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved | |
627 | * would return 0. | |
628 | */ | |
629 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); | |
630 | stop = add_buf(q->first_to_check, count); | |
631 | ||
779e6e1c JG |
632 | if (q->first_to_check == stop) |
633 | return q->first_to_check; | |
634 | ||
50f769df | 635 | count = get_buf_states(q, q->first_to_check, &state, count, 0); |
779e6e1c JG |
636 | if (!count) |
637 | return q->first_to_check; | |
638 | ||
639 | switch (state) { | |
640 | case SLSB_P_OUTPUT_EMPTY: | |
641 | /* the adapter got it */ | |
1d7e1500 | 642 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %02x", q->nr, count); |
779e6e1c JG |
643 | |
644 | atomic_sub(count, &q->nr_buf_used); | |
645 | q->first_to_check = add_buf(q->first_to_check, count); | |
36e3e721 | 646 | break; |
779e6e1c | 647 | case SLSB_P_OUTPUT_ERROR: |
50f769df | 648 | announce_buffer_error(q, count); |
779e6e1c JG |
649 | /* process the buffer, the upper layer will take care of it */ |
650 | q->first_to_check = add_buf(q->first_to_check, count); | |
651 | atomic_sub(count, &q->nr_buf_used); | |
652 | break; | |
653 | case SLSB_CU_OUTPUT_PRIMED: | |
654 | /* the adapter has not fetched the output yet */ | |
22f99347 | 655 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr); |
779e6e1c JG |
656 | break; |
657 | case SLSB_P_OUTPUT_NOT_INIT: | |
658 | case SLSB_P_OUTPUT_HALTED: | |
659 | break; | |
660 | default: | |
661 | BUG(); | |
662 | } | |
663 | return q->first_to_check; | |
664 | } | |
665 | ||
666 | /* all buffers processed? */ | |
667 | static inline int qdio_outbound_q_done(struct qdio_q *q) | |
668 | { | |
669 | return atomic_read(&q->nr_buf_used) == 0; | |
670 | } | |
671 | ||
672 | static inline int qdio_outbound_q_moved(struct qdio_q *q) | |
673 | { | |
674 | int bufnr; | |
675 | ||
676 | bufnr = get_outbound_buffer_frontier(q); | |
677 | ||
e85dea0e JG |
678 | if ((bufnr != q->last_move) || q->qdio_error) { |
679 | q->last_move = bufnr; | |
22f99347 | 680 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr); |
779e6e1c JG |
681 | return 1; |
682 | } else | |
683 | return 0; | |
684 | } | |
685 | ||
d303b6fd | 686 | static int qdio_kick_outbound_q(struct qdio_q *q) |
779e6e1c | 687 | { |
7a0b4cbc JG |
688 | unsigned int busy_bit; |
689 | int cc; | |
779e6e1c JG |
690 | |
691 | if (!need_siga_out(q)) | |
d303b6fd | 692 | return 0; |
779e6e1c | 693 | |
7a0b4cbc | 694 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr); |
6486cda6 | 695 | qperf_inc(q, siga_write); |
7a0b4cbc JG |
696 | |
697 | cc = qdio_siga_output(q, &busy_bit); | |
698 | switch (cc) { | |
779e6e1c | 699 | case 0: |
779e6e1c | 700 | break; |
7a0b4cbc JG |
701 | case 2: |
702 | if (busy_bit) { | |
703 | DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr); | |
d303b6fd JG |
704 | cc |= QDIO_ERROR_SIGA_BUSY; |
705 | } else | |
706 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr); | |
7a0b4cbc JG |
707 | break; |
708 | case 1: | |
709 | case 3: | |
710 | DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc); | |
7a0b4cbc | 711 | break; |
779e6e1c | 712 | } |
d303b6fd | 713 | return cc; |
779e6e1c JG |
714 | } |
715 | ||
779e6e1c JG |
716 | static void __qdio_outbound_processing(struct qdio_q *q) |
717 | { | |
6486cda6 | 718 | qperf_inc(q, tasklet_outbound); |
779e6e1c JG |
719 | BUG_ON(atomic_read(&q->nr_buf_used) < 0); |
720 | ||
721 | if (qdio_outbound_q_moved(q)) | |
9c8a08d7 | 722 | qdio_kick_handler(q); |
779e6e1c | 723 | |
c38f9608 | 724 | if (queue_type(q) == QDIO_ZFCP_QFMT) |
779e6e1c | 725 | if (!pci_out_supported(q) && !qdio_outbound_q_done(q)) |
c38f9608 | 726 | goto sched; |
779e6e1c JG |
727 | |
728 | /* bail out for HiperSockets unicast queues */ | |
729 | if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q)) | |
730 | return; | |
731 | ||
4bcb3a37 | 732 | if ((queue_type(q) == QDIO_IQDIO_QFMT) && |
c38f9608 JG |
733 | (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL) |
734 | goto sched; | |
4bcb3a37 | 735 | |
779e6e1c JG |
736 | if (q->u.out.pci_out_enabled) |
737 | return; | |
738 | ||
739 | /* | |
740 | * Now we know that queue type is either qeth without pci enabled | |
741 | * or HiperSockets multicast. Make sure buffer switch from PRIMED to | |
742 | * EMPTY is noticed and outbound_handler is called after some time. | |
743 | */ | |
744 | if (qdio_outbound_q_done(q)) | |
745 | del_timer(&q->u.out.timer); | |
6486cda6 JG |
746 | else |
747 | if (!timer_pending(&q->u.out.timer)) | |
779e6e1c | 748 | mod_timer(&q->u.out.timer, jiffies + 10 * HZ); |
c38f9608 JG |
749 | return; |
750 | ||
751 | sched: | |
752 | if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) | |
753 | return; | |
754 | tasklet_schedule(&q->tasklet); | |
779e6e1c JG |
755 | } |
756 | ||
757 | /* outbound tasklet */ | |
758 | void qdio_outbound_processing(unsigned long data) | |
759 | { | |
760 | struct qdio_q *q = (struct qdio_q *)data; | |
761 | __qdio_outbound_processing(q); | |
762 | } | |
763 | ||
764 | void qdio_outbound_timer(unsigned long data) | |
765 | { | |
766 | struct qdio_q *q = (struct qdio_q *)data; | |
c38f9608 JG |
767 | |
768 | if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) | |
769 | return; | |
779e6e1c JG |
770 | tasklet_schedule(&q->tasklet); |
771 | } | |
772 | ||
60b5df2f | 773 | static inline void qdio_check_outbound_after_thinint(struct qdio_q *q) |
779e6e1c JG |
774 | { |
775 | struct qdio_q *out; | |
776 | int i; | |
777 | ||
778 | if (!pci_out_supported(q)) | |
779 | return; | |
780 | ||
781 | for_each_output_queue(q->irq_ptr, out, i) | |
782 | if (!qdio_outbound_q_done(out)) | |
783 | tasklet_schedule(&out->tasklet); | |
784 | } | |
785 | ||
60b5df2f JG |
786 | static void __tiqdio_inbound_processing(struct qdio_q *q) |
787 | { | |
6486cda6 | 788 | qperf_inc(q, tasklet_inbound); |
60b5df2f JG |
789 | qdio_sync_after_thinint(q); |
790 | ||
791 | /* | |
792 | * The interrupt could be caused by a PCI request. Check the | |
793 | * PCI capable outbound queues. | |
794 | */ | |
795 | qdio_check_outbound_after_thinint(q); | |
796 | ||
797 | if (!qdio_inbound_q_moved(q)) | |
798 | return; | |
799 | ||
800 | qdio_kick_handler(q); | |
801 | ||
9a2c160a | 802 | if (!qdio_inbound_q_done(q)) { |
6486cda6 | 803 | qperf_inc(q, tasklet_inbound_resched); |
e2910bcf | 804 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) { |
60b5df2f | 805 | tasklet_schedule(&q->tasklet); |
e2910bcf JG |
806 | return; |
807 | } | |
60b5df2f JG |
808 | } |
809 | ||
810 | qdio_stop_polling(q); | |
811 | /* | |
812 | * We need to check again to not lose initiative after | |
813 | * resetting the ACK state. | |
814 | */ | |
9a2c160a | 815 | if (!qdio_inbound_q_done(q)) { |
6486cda6 | 816 | qperf_inc(q, tasklet_inbound_resched2); |
60b5df2f JG |
817 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) |
818 | tasklet_schedule(&q->tasklet); | |
819 | } | |
820 | } | |
821 | ||
822 | void tiqdio_inbound_processing(unsigned long data) | |
823 | { | |
824 | struct qdio_q *q = (struct qdio_q *)data; | |
825 | __tiqdio_inbound_processing(q); | |
826 | } | |
827 | ||
779e6e1c JG |
828 | static inline void qdio_set_state(struct qdio_irq *irq_ptr, |
829 | enum qdio_irq_states state) | |
830 | { | |
22f99347 | 831 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state); |
779e6e1c JG |
832 | |
833 | irq_ptr->state = state; | |
834 | mb(); | |
835 | } | |
836 | ||
22f99347 | 837 | static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb) |
779e6e1c | 838 | { |
779e6e1c | 839 | if (irb->esw.esw0.erw.cons) { |
22f99347 JG |
840 | DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no); |
841 | DBF_ERROR_HEX(irb, 64); | |
842 | DBF_ERROR_HEX(irb->ecw, 64); | |
779e6e1c JG |
843 | } |
844 | } | |
845 | ||
846 | /* PCI interrupt handler */ | |
847 | static void qdio_int_handler_pci(struct qdio_irq *irq_ptr) | |
848 | { | |
849 | int i; | |
850 | struct qdio_q *q; | |
851 | ||
c38f9608 JG |
852 | if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) |
853 | return; | |
854 | ||
779e6e1c JG |
855 | for_each_input_queue(irq_ptr, q, i) |
856 | tasklet_schedule(&q->tasklet); | |
857 | ||
858 | if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED)) | |
859 | return; | |
860 | ||
861 | for_each_output_queue(irq_ptr, q, i) { | |
862 | if (qdio_outbound_q_done(q)) | |
863 | continue; | |
864 | ||
865 | if (!siga_syncs_out_pci(q)) | |
866 | qdio_siga_sync_q(q); | |
867 | ||
868 | tasklet_schedule(&q->tasklet); | |
869 | } | |
870 | } | |
871 | ||
872 | static void qdio_handle_activate_check(struct ccw_device *cdev, | |
873 | unsigned long intparm, int cstat, int dstat) | |
874 | { | |
875 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
876 | struct qdio_q *q; | |
779e6e1c | 877 | |
22f99347 JG |
878 | DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no); |
879 | DBF_ERROR("intp :%lx", intparm); | |
880 | DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); | |
779e6e1c JG |
881 | |
882 | if (irq_ptr->nr_input_qs) { | |
883 | q = irq_ptr->input_qs[0]; | |
884 | } else if (irq_ptr->nr_output_qs) { | |
885 | q = irq_ptr->output_qs[0]; | |
886 | } else { | |
887 | dump_stack(); | |
888 | goto no_handler; | |
889 | } | |
890 | q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION, | |
891 | 0, -1, -1, irq_ptr->int_parm); | |
892 | no_handler: | |
893 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); | |
894 | } | |
895 | ||
4c575423 JG |
896 | static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat, |
897 | int dstat) | |
779e6e1c JG |
898 | { |
899 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
900 | ||
4c575423 | 901 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq"); |
779e6e1c | 902 | |
4c575423 | 903 | if (cstat) |
779e6e1c | 904 | goto error; |
4c575423 | 905 | if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END)) |
779e6e1c | 906 | goto error; |
4c575423 JG |
907 | if (!(dstat & DEV_STAT_DEV_END)) |
908 | goto error; | |
909 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED); | |
910 | return; | |
911 | ||
779e6e1c | 912 | error: |
22f99347 JG |
913 | DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no); |
914 | DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); | |
779e6e1c | 915 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); |
779e6e1c JG |
916 | } |
917 | ||
918 | /* qdio interrupt handler */ | |
919 | void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm, | |
920 | struct irb *irb) | |
921 | { | |
922 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
923 | int cstat, dstat; | |
779e6e1c | 924 | |
779e6e1c | 925 | if (!intparm || !irq_ptr) { |
22f99347 | 926 | DBF_ERROR("qint:%4x", cdev->private->schid.sch_no); |
779e6e1c JG |
927 | return; |
928 | } | |
929 | ||
930 | if (IS_ERR(irb)) { | |
931 | switch (PTR_ERR(irb)) { | |
932 | case -EIO: | |
22f99347 | 933 | DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no); |
75cb71f3 JG |
934 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); |
935 | wake_up(&cdev->private->wait_q); | |
779e6e1c JG |
936 | return; |
937 | default: | |
938 | WARN_ON(1); | |
939 | return; | |
940 | } | |
941 | } | |
22f99347 | 942 | qdio_irq_check_sense(irq_ptr, irb); |
779e6e1c JG |
943 | cstat = irb->scsw.cmd.cstat; |
944 | dstat = irb->scsw.cmd.dstat; | |
945 | ||
946 | switch (irq_ptr->state) { | |
947 | case QDIO_IRQ_STATE_INACTIVE: | |
948 | qdio_establish_handle_irq(cdev, cstat, dstat); | |
949 | break; | |
779e6e1c JG |
950 | case QDIO_IRQ_STATE_CLEANUP: |
951 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
952 | break; | |
779e6e1c JG |
953 | case QDIO_IRQ_STATE_ESTABLISHED: |
954 | case QDIO_IRQ_STATE_ACTIVE: | |
955 | if (cstat & SCHN_STAT_PCI) { | |
956 | qdio_int_handler_pci(irq_ptr); | |
779e6e1c JG |
957 | return; |
958 | } | |
4c575423 | 959 | if (cstat || dstat) |
779e6e1c JG |
960 | qdio_handle_activate_check(cdev, intparm, cstat, |
961 | dstat); | |
4c575423 | 962 | break; |
779e6e1c JG |
963 | default: |
964 | WARN_ON(1); | |
965 | } | |
966 | wake_up(&cdev->private->wait_q); | |
967 | } | |
968 | ||
969 | /** | |
970 | * qdio_get_ssqd_desc - get qdio subchannel description | |
971 | * @cdev: ccw device to get description for | |
bbd50e17 | 972 | * @data: where to store the ssqd |
779e6e1c | 973 | * |
bbd50e17 JG |
974 | * Returns 0 or an error code. The results of the chsc are stored in the |
975 | * specified structure. | |
779e6e1c | 976 | */ |
bbd50e17 JG |
977 | int qdio_get_ssqd_desc(struct ccw_device *cdev, |
978 | struct qdio_ssqd_desc *data) | |
779e6e1c | 979 | { |
779e6e1c | 980 | |
bbd50e17 JG |
981 | if (!cdev || !cdev->private) |
982 | return -EINVAL; | |
983 | ||
22f99347 | 984 | DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no); |
bbd50e17 | 985 | return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data); |
779e6e1c JG |
986 | } |
987 | EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc); | |
988 | ||
989 | /** | |
990 | * qdio_cleanup - shutdown queues and free data structures | |
991 | * @cdev: associated ccw device | |
992 | * @how: use halt or clear to shutdown | |
993 | * | |
700e982f JG |
994 | * This function calls qdio_shutdown() for @cdev with method @how. |
995 | * and qdio_free(). The qdio_free() return value is ignored since | |
996 | * !irq_ptr is already checked. | |
779e6e1c JG |
997 | */ |
998 | int qdio_cleanup(struct ccw_device *cdev, int how) | |
999 | { | |
22f99347 | 1000 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
779e6e1c JG |
1001 | int rc; |
1002 | ||
779e6e1c JG |
1003 | if (!irq_ptr) |
1004 | return -ENODEV; | |
1005 | ||
779e6e1c | 1006 | rc = qdio_shutdown(cdev, how); |
700e982f JG |
1007 | |
1008 | qdio_free(cdev); | |
779e6e1c JG |
1009 | return rc; |
1010 | } | |
1011 | EXPORT_SYMBOL_GPL(qdio_cleanup); | |
1012 | ||
1013 | static void qdio_shutdown_queues(struct ccw_device *cdev) | |
1014 | { | |
1015 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1016 | struct qdio_q *q; | |
1017 | int i; | |
1018 | ||
1019 | for_each_input_queue(irq_ptr, q, i) | |
c38f9608 | 1020 | tasklet_kill(&q->tasklet); |
779e6e1c JG |
1021 | |
1022 | for_each_output_queue(irq_ptr, q, i) { | |
779e6e1c | 1023 | del_timer(&q->u.out.timer); |
c38f9608 | 1024 | tasklet_kill(&q->tasklet); |
779e6e1c JG |
1025 | } |
1026 | } | |
1027 | ||
1028 | /** | |
1029 | * qdio_shutdown - shut down a qdio subchannel | |
1030 | * @cdev: associated ccw device | |
1031 | * @how: use halt or clear to shutdown | |
1032 | */ | |
1033 | int qdio_shutdown(struct ccw_device *cdev, int how) | |
1034 | { | |
22f99347 | 1035 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
779e6e1c JG |
1036 | int rc; |
1037 | unsigned long flags; | |
779e6e1c | 1038 | |
779e6e1c JG |
1039 | if (!irq_ptr) |
1040 | return -ENODEV; | |
1041 | ||
b4547402 | 1042 | BUG_ON(irqs_disabled()); |
22f99347 JG |
1043 | DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no); |
1044 | ||
779e6e1c JG |
1045 | mutex_lock(&irq_ptr->setup_mutex); |
1046 | /* | |
1047 | * Subchannel was already shot down. We cannot prevent being called | |
1048 | * twice since cio may trigger a shutdown asynchronously. | |
1049 | */ | |
1050 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { | |
1051 | mutex_unlock(&irq_ptr->setup_mutex); | |
1052 | return 0; | |
1053 | } | |
1054 | ||
c38f9608 JG |
1055 | /* |
1056 | * Indicate that the device is going down. Scheduling the queue | |
1057 | * tasklets is forbidden from here on. | |
1058 | */ | |
1059 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); | |
1060 | ||
779e6e1c JG |
1061 | tiqdio_remove_input_queues(irq_ptr); |
1062 | qdio_shutdown_queues(cdev); | |
1063 | qdio_shutdown_debug_entries(irq_ptr, cdev); | |
1064 | ||
1065 | /* cleanup subchannel */ | |
1066 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1067 | ||
1068 | if (how & QDIO_FLAG_CLEANUP_USING_CLEAR) | |
1069 | rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP); | |
1070 | else | |
1071 | /* default behaviour is halt */ | |
1072 | rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP); | |
1073 | if (rc) { | |
22f99347 JG |
1074 | DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no); |
1075 | DBF_ERROR("rc:%4d", rc); | |
779e6e1c JG |
1076 | goto no_cleanup; |
1077 | } | |
1078 | ||
1079 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP); | |
1080 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1081 | wait_event_interruptible_timeout(cdev->private->wait_q, | |
1082 | irq_ptr->state == QDIO_IRQ_STATE_INACTIVE || | |
1083 | irq_ptr->state == QDIO_IRQ_STATE_ERR, | |
1084 | 10 * HZ); | |
1085 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1086 | ||
1087 | no_cleanup: | |
1088 | qdio_shutdown_thinint(irq_ptr); | |
1089 | ||
1090 | /* restore interrupt handler */ | |
1091 | if ((void *)cdev->handler == (void *)qdio_int_handler) | |
1092 | cdev->handler = irq_ptr->orig_handler; | |
1093 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1094 | ||
1095 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1096 | mutex_unlock(&irq_ptr->setup_mutex); | |
779e6e1c JG |
1097 | if (rc) |
1098 | return rc; | |
1099 | return 0; | |
1100 | } | |
1101 | EXPORT_SYMBOL_GPL(qdio_shutdown); | |
1102 | ||
1103 | /** | |
1104 | * qdio_free - free data structures for a qdio subchannel | |
1105 | * @cdev: associated ccw device | |
1106 | */ | |
1107 | int qdio_free(struct ccw_device *cdev) | |
1108 | { | |
22f99347 | 1109 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
58eb27cd | 1110 | |
779e6e1c JG |
1111 | if (!irq_ptr) |
1112 | return -ENODEV; | |
1113 | ||
22f99347 | 1114 | DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no); |
779e6e1c | 1115 | mutex_lock(&irq_ptr->setup_mutex); |
22f99347 JG |
1116 | |
1117 | if (irq_ptr->debug_area != NULL) { | |
1118 | debug_unregister(irq_ptr->debug_area); | |
1119 | irq_ptr->debug_area = NULL; | |
1120 | } | |
779e6e1c JG |
1121 | cdev->private->qdio_data = NULL; |
1122 | mutex_unlock(&irq_ptr->setup_mutex); | |
1123 | ||
1124 | qdio_release_memory(irq_ptr); | |
1125 | return 0; | |
1126 | } | |
1127 | EXPORT_SYMBOL_GPL(qdio_free); | |
1128 | ||
1129 | /** | |
1130 | * qdio_initialize - allocate and establish queues for a qdio subchannel | |
1131 | * @init_data: initialization data | |
1132 | * | |
1133 | * This function first allocates queues via qdio_allocate() and on success | |
1134 | * establishes them via qdio_establish(). | |
1135 | */ | |
1136 | int qdio_initialize(struct qdio_initialize *init_data) | |
1137 | { | |
1138 | int rc; | |
779e6e1c JG |
1139 | |
1140 | rc = qdio_allocate(init_data); | |
1141 | if (rc) | |
1142 | return rc; | |
1143 | ||
1144 | rc = qdio_establish(init_data); | |
1145 | if (rc) | |
1146 | qdio_free(init_data->cdev); | |
1147 | return rc; | |
1148 | } | |
1149 | EXPORT_SYMBOL_GPL(qdio_initialize); | |
1150 | ||
1151 | /** | |
1152 | * qdio_allocate - allocate qdio queues and associated data | |
1153 | * @init_data: initialization data | |
1154 | */ | |
1155 | int qdio_allocate(struct qdio_initialize *init_data) | |
1156 | { | |
1157 | struct qdio_irq *irq_ptr; | |
779e6e1c | 1158 | |
22f99347 | 1159 | DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no); |
779e6e1c JG |
1160 | |
1161 | if ((init_data->no_input_qs && !init_data->input_handler) || | |
1162 | (init_data->no_output_qs && !init_data->output_handler)) | |
1163 | return -EINVAL; | |
1164 | ||
1165 | if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) || | |
1166 | (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)) | |
1167 | return -EINVAL; | |
1168 | ||
1169 | if ((!init_data->input_sbal_addr_array) || | |
1170 | (!init_data->output_sbal_addr_array)) | |
1171 | return -EINVAL; | |
1172 | ||
779e6e1c JG |
1173 | /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */ |
1174 | irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
1175 | if (!irq_ptr) | |
1176 | goto out_err; | |
779e6e1c JG |
1177 | |
1178 | mutex_init(&irq_ptr->setup_mutex); | |
22f99347 | 1179 | qdio_allocate_dbf(init_data, irq_ptr); |
779e6e1c JG |
1180 | |
1181 | /* | |
1182 | * Allocate a page for the chsc calls in qdio_establish. | |
1183 | * Must be pre-allocated since a zfcp recovery will call | |
1184 | * qdio_establish. In case of low memory and swap on a zfcp disk | |
1185 | * we may not be able to allocate memory otherwise. | |
1186 | */ | |
1187 | irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL); | |
1188 | if (!irq_ptr->chsc_page) | |
1189 | goto out_rel; | |
1190 | ||
1191 | /* qdr is used in ccw1.cda which is u32 */ | |
3b8e3004 | 1192 | irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
779e6e1c JG |
1193 | if (!irq_ptr->qdr) |
1194 | goto out_rel; | |
1195 | WARN_ON((unsigned long)irq_ptr->qdr & 0xfff); | |
1196 | ||
779e6e1c JG |
1197 | if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs, |
1198 | init_data->no_output_qs)) | |
1199 | goto out_rel; | |
1200 | ||
1201 | init_data->cdev->private->qdio_data = irq_ptr; | |
1202 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1203 | return 0; | |
1204 | out_rel: | |
1205 | qdio_release_memory(irq_ptr); | |
1206 | out_err: | |
1207 | return -ENOMEM; | |
1208 | } | |
1209 | EXPORT_SYMBOL_GPL(qdio_allocate); | |
1210 | ||
1211 | /** | |
1212 | * qdio_establish - establish queues on a qdio subchannel | |
1213 | * @init_data: initialization data | |
1214 | */ | |
1215 | int qdio_establish(struct qdio_initialize *init_data) | |
1216 | { | |
779e6e1c JG |
1217 | struct qdio_irq *irq_ptr; |
1218 | struct ccw_device *cdev = init_data->cdev; | |
1219 | unsigned long saveflags; | |
1220 | int rc; | |
1221 | ||
22f99347 | 1222 | DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no); |
58eb27cd | 1223 | |
779e6e1c JG |
1224 | irq_ptr = cdev->private->qdio_data; |
1225 | if (!irq_ptr) | |
1226 | return -ENODEV; | |
1227 | ||
1228 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1229 | return -EINVAL; | |
1230 | ||
779e6e1c JG |
1231 | mutex_lock(&irq_ptr->setup_mutex); |
1232 | qdio_setup_irq(init_data); | |
1233 | ||
1234 | rc = qdio_establish_thinint(irq_ptr); | |
1235 | if (rc) { | |
1236 | mutex_unlock(&irq_ptr->setup_mutex); | |
1237 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1238 | return rc; | |
1239 | } | |
1240 | ||
1241 | /* establish q */ | |
1242 | irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd; | |
1243 | irq_ptr->ccw.flags = CCW_FLAG_SLI; | |
1244 | irq_ptr->ccw.count = irq_ptr->equeue.count; | |
1245 | irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr); | |
1246 | ||
1247 | spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); | |
1248 | ccw_device_set_options_mask(cdev, 0); | |
1249 | ||
1250 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0); | |
1251 | if (rc) { | |
22f99347 JG |
1252 | DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no); |
1253 | DBF_ERROR("rc:%4x", rc); | |
779e6e1c JG |
1254 | } |
1255 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); | |
1256 | ||
1257 | if (rc) { | |
1258 | mutex_unlock(&irq_ptr->setup_mutex); | |
1259 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1260 | return rc; | |
1261 | } | |
1262 | ||
1263 | wait_event_interruptible_timeout(cdev->private->wait_q, | |
1264 | irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED || | |
1265 | irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ); | |
1266 | ||
1267 | if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) { | |
1268 | mutex_unlock(&irq_ptr->setup_mutex); | |
1269 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1270 | return -EIO; | |
1271 | } | |
1272 | ||
1273 | qdio_setup_ssqd_info(irq_ptr); | |
22f99347 JG |
1274 | DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc); |
1275 | DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac); | |
779e6e1c JG |
1276 | |
1277 | /* qebsm is now setup if available, initialize buffer states */ | |
1278 | qdio_init_buf_states(irq_ptr); | |
1279 | ||
1280 | mutex_unlock(&irq_ptr->setup_mutex); | |
1281 | qdio_print_subchannel_info(irq_ptr, cdev); | |
1282 | qdio_setup_debug_entries(irq_ptr, cdev); | |
1283 | return 0; | |
1284 | } | |
1285 | EXPORT_SYMBOL_GPL(qdio_establish); | |
1286 | ||
1287 | /** | |
1288 | * qdio_activate - activate queues on a qdio subchannel | |
1289 | * @cdev: associated cdev | |
1290 | */ | |
1291 | int qdio_activate(struct ccw_device *cdev) | |
1292 | { | |
1293 | struct qdio_irq *irq_ptr; | |
1294 | int rc; | |
1295 | unsigned long saveflags; | |
779e6e1c | 1296 | |
22f99347 | 1297 | DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no); |
58eb27cd | 1298 | |
779e6e1c JG |
1299 | irq_ptr = cdev->private->qdio_data; |
1300 | if (!irq_ptr) | |
1301 | return -ENODEV; | |
1302 | ||
1303 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1304 | return -EINVAL; | |
1305 | ||
1306 | mutex_lock(&irq_ptr->setup_mutex); | |
1307 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { | |
1308 | rc = -EBUSY; | |
1309 | goto out; | |
1310 | } | |
1311 | ||
779e6e1c JG |
1312 | irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd; |
1313 | irq_ptr->ccw.flags = CCW_FLAG_SLI; | |
1314 | irq_ptr->ccw.count = irq_ptr->aqueue.count; | |
1315 | irq_ptr->ccw.cda = 0; | |
1316 | ||
1317 | spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); | |
1318 | ccw_device_set_options(cdev, CCWDEV_REPORT_ALL); | |
1319 | ||
1320 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE, | |
1321 | 0, DOIO_DENY_PREFETCH); | |
1322 | if (rc) { | |
22f99347 JG |
1323 | DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no); |
1324 | DBF_ERROR("rc:%4x", rc); | |
779e6e1c JG |
1325 | } |
1326 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); | |
1327 | ||
1328 | if (rc) | |
1329 | goto out; | |
1330 | ||
1331 | if (is_thinint_irq(irq_ptr)) | |
1332 | tiqdio_add_input_queues(irq_ptr); | |
1333 | ||
1334 | /* wait for subchannel to become active */ | |
1335 | msleep(5); | |
1336 | ||
1337 | switch (irq_ptr->state) { | |
1338 | case QDIO_IRQ_STATE_STOPPED: | |
1339 | case QDIO_IRQ_STATE_ERR: | |
e4c14e20 JG |
1340 | rc = -EIO; |
1341 | break; | |
779e6e1c JG |
1342 | default: |
1343 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE); | |
1344 | rc = 0; | |
1345 | } | |
1346 | out: | |
1347 | mutex_unlock(&irq_ptr->setup_mutex); | |
1348 | return rc; | |
1349 | } | |
1350 | EXPORT_SYMBOL_GPL(qdio_activate); | |
1351 | ||
1352 | static inline int buf_in_between(int bufnr, int start, int count) | |
1353 | { | |
1354 | int end = add_buf(start, count); | |
1355 | ||
1356 | if (end > start) { | |
1357 | if (bufnr >= start && bufnr < end) | |
1358 | return 1; | |
1359 | else | |
1360 | return 0; | |
1361 | } | |
1362 | ||
1363 | /* wrap-around case */ | |
1364 | if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) || | |
1365 | (bufnr < end)) | |
1366 | return 1; | |
1367 | else | |
1368 | return 0; | |
1369 | } | |
1370 | ||
1371 | /** | |
1372 | * handle_inbound - reset processed input buffers | |
1373 | * @q: queue containing the buffers | |
1374 | * @callflags: flags | |
1375 | * @bufnr: first buffer to process | |
1376 | * @count: how many buffers are emptied | |
1377 | */ | |
d303b6fd JG |
1378 | static int handle_inbound(struct qdio_q *q, unsigned int callflags, |
1379 | int bufnr, int count) | |
779e6e1c | 1380 | { |
d303b6fd | 1381 | int used, diff; |
779e6e1c | 1382 | |
6486cda6 JG |
1383 | qperf_inc(q, inbound_call); |
1384 | ||
50f769df JG |
1385 | if (!q->u.in.polling) |
1386 | goto set; | |
1387 | ||
1388 | /* protect against stop polling setting an ACK for an emptied slsb */ | |
1389 | if (count == QDIO_MAX_BUFFERS_PER_Q) { | |
1390 | /* overwriting everything, just delete polling status */ | |
1391 | q->u.in.polling = 0; | |
1392 | q->u.in.ack_count = 0; | |
1393 | goto set; | |
e85dea0e | 1394 | } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) { |
50f769df | 1395 | if (is_qebsm(q)) { |
e85dea0e | 1396 | /* partial overwrite, just update ack_start */ |
50f769df | 1397 | diff = add_buf(bufnr, count); |
e85dea0e | 1398 | diff = sub_buf(diff, q->u.in.ack_start); |
50f769df JG |
1399 | q->u.in.ack_count -= diff; |
1400 | if (q->u.in.ack_count <= 0) { | |
1401 | q->u.in.polling = 0; | |
1402 | q->u.in.ack_count = 0; | |
50f769df JG |
1403 | goto set; |
1404 | } | |
e85dea0e | 1405 | q->u.in.ack_start = add_buf(q->u.in.ack_start, diff); |
50f769df JG |
1406 | } |
1407 | else | |
1408 | /* the only ACK will be deleted, so stop polling */ | |
779e6e1c | 1409 | q->u.in.polling = 0; |
50f769df | 1410 | } |
779e6e1c | 1411 | |
50f769df | 1412 | set: |
779e6e1c | 1413 | count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count); |
779e6e1c JG |
1414 | |
1415 | used = atomic_add_return(count, &q->nr_buf_used) - count; | |
1416 | BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q); | |
1417 | ||
1418 | /* no need to signal as long as the adapter had free buffers */ | |
1419 | if (used) | |
d303b6fd | 1420 | return 0; |
779e6e1c | 1421 | |
d303b6fd JG |
1422 | if (need_siga_in(q)) |
1423 | return qdio_siga_input(q); | |
1424 | return 0; | |
779e6e1c JG |
1425 | } |
1426 | ||
1427 | /** | |
1428 | * handle_outbound - process filled outbound buffers | |
1429 | * @q: queue containing the buffers | |
1430 | * @callflags: flags | |
1431 | * @bufnr: first buffer to process | |
1432 | * @count: how many buffers are filled | |
1433 | */ | |
d303b6fd JG |
1434 | static int handle_outbound(struct qdio_q *q, unsigned int callflags, |
1435 | int bufnr, int count) | |
779e6e1c JG |
1436 | { |
1437 | unsigned char state; | |
d303b6fd | 1438 | int used, rc = 0; |
779e6e1c | 1439 | |
6486cda6 | 1440 | qperf_inc(q, outbound_call); |
779e6e1c JG |
1441 | |
1442 | count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count); | |
1443 | used = atomic_add_return(count, &q->nr_buf_used); | |
1444 | BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q); | |
1445 | ||
6486cda6 | 1446 | if (callflags & QDIO_FLAG_PCI_OUT) { |
779e6e1c | 1447 | q->u.out.pci_out_enabled = 1; |
6486cda6 JG |
1448 | qperf_inc(q, pci_request_int); |
1449 | } | |
779e6e1c JG |
1450 | else |
1451 | q->u.out.pci_out_enabled = 0; | |
1452 | ||
1453 | if (queue_type(q) == QDIO_IQDIO_QFMT) { | |
1454 | if (multicast_outbound(q)) | |
d303b6fd | 1455 | rc = qdio_kick_outbound_q(q); |
779e6e1c | 1456 | else |
7a0f4755 KDW |
1457 | if ((q->irq_ptr->ssqd_desc.mmwc > 1) && |
1458 | (count > 1) && | |
1459 | (count <= q->irq_ptr->ssqd_desc.mmwc)) { | |
1460 | /* exploit enhanced SIGA */ | |
1461 | q->u.out.use_enh_siga = 1; | |
d303b6fd | 1462 | rc = qdio_kick_outbound_q(q); |
7a0f4755 KDW |
1463 | } else { |
1464 | /* | |
1465 | * One siga-w per buffer required for unicast | |
1466 | * HiperSockets. | |
1467 | */ | |
1468 | q->u.out.use_enh_siga = 0; | |
d303b6fd JG |
1469 | while (count--) { |
1470 | rc = qdio_kick_outbound_q(q); | |
1471 | if (rc) | |
1472 | goto out; | |
1473 | } | |
7a0f4755 | 1474 | } |
779e6e1c JG |
1475 | goto out; |
1476 | } | |
1477 | ||
1478 | if (need_siga_sync(q)) { | |
1479 | qdio_siga_sync_q(q); | |
1480 | goto out; | |
1481 | } | |
1482 | ||
1483 | /* try to fast requeue buffers */ | |
50f769df | 1484 | get_buf_state(q, prev_buf(bufnr), &state, 0); |
779e6e1c | 1485 | if (state != SLSB_CU_OUTPUT_PRIMED) |
d303b6fd | 1486 | rc = qdio_kick_outbound_q(q); |
1d7e1500 | 1487 | else |
6486cda6 | 1488 | qperf_inc(q, fast_requeue); |
1d7e1500 | 1489 | |
779e6e1c | 1490 | out: |
779e6e1c | 1491 | tasklet_schedule(&q->tasklet); |
d303b6fd | 1492 | return rc; |
779e6e1c JG |
1493 | } |
1494 | ||
1495 | /** | |
1496 | * do_QDIO - process input or output buffers | |
1497 | * @cdev: associated ccw_device for the qdio subchannel | |
1498 | * @callflags: input or output and special flags from the program | |
1499 | * @q_nr: queue number | |
1500 | * @bufnr: buffer number | |
1501 | * @count: how many buffers to process | |
1502 | */ | |
1503 | int do_QDIO(struct ccw_device *cdev, unsigned int callflags, | |
6618241b | 1504 | int q_nr, unsigned int bufnr, unsigned int count) |
779e6e1c JG |
1505 | { |
1506 | struct qdio_irq *irq_ptr; | |
779e6e1c | 1507 | |
6618241b | 1508 | if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q) |
779e6e1c JG |
1509 | return -EINVAL; |
1510 | ||
779e6e1c JG |
1511 | irq_ptr = cdev->private->qdio_data; |
1512 | if (!irq_ptr) | |
1513 | return -ENODEV; | |
1514 | ||
1d7e1500 JG |
1515 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, |
1516 | "do%02x b:%02x c:%02x", callflags, bufnr, count); | |
779e6e1c JG |
1517 | |
1518 | if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE) | |
1519 | return -EBUSY; | |
1520 | ||
1521 | if (callflags & QDIO_FLAG_SYNC_INPUT) | |
d303b6fd JG |
1522 | return handle_inbound(irq_ptr->input_qs[q_nr], |
1523 | callflags, bufnr, count); | |
779e6e1c | 1524 | else if (callflags & QDIO_FLAG_SYNC_OUTPUT) |
d303b6fd JG |
1525 | return handle_outbound(irq_ptr->output_qs[q_nr], |
1526 | callflags, bufnr, count); | |
1527 | return -EINVAL; | |
779e6e1c JG |
1528 | } |
1529 | EXPORT_SYMBOL_GPL(do_QDIO); | |
1530 | ||
1531 | static int __init init_QDIO(void) | |
1532 | { | |
1533 | int rc; | |
1534 | ||
1535 | rc = qdio_setup_init(); | |
1536 | if (rc) | |
1537 | return rc; | |
1538 | rc = tiqdio_allocate_memory(); | |
1539 | if (rc) | |
1540 | goto out_cache; | |
1541 | rc = qdio_debug_init(); | |
1542 | if (rc) | |
1543 | goto out_ti; | |
779e6e1c JG |
1544 | rc = tiqdio_register_thinints(); |
1545 | if (rc) | |
6486cda6 | 1546 | goto out_debug; |
779e6e1c JG |
1547 | return 0; |
1548 | ||
779e6e1c JG |
1549 | out_debug: |
1550 | qdio_debug_exit(); | |
1551 | out_ti: | |
1552 | tiqdio_free_memory(); | |
1553 | out_cache: | |
1554 | qdio_setup_exit(); | |
1555 | return rc; | |
1556 | } | |
1557 | ||
1558 | static void __exit exit_QDIO(void) | |
1559 | { | |
1560 | tiqdio_unregister_thinints(); | |
1561 | tiqdio_free_memory(); | |
779e6e1c JG |
1562 | qdio_debug_exit(); |
1563 | qdio_setup_exit(); | |
1564 | } | |
1565 | ||
1566 | module_init(init_QDIO); | |
1567 | module_exit(exit_QDIO); |