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" | |
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, | |
7a0b4cbc | 77 | unsigned int *bb, unsigned int fc) |
779e6e1c JG |
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 | 116 | * |
73ac36ea | 117 | * Returns the number of successfully extracted equal buffer states. |
779e6e1c JG |
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 | ||
60b5df2f JG |
234 | static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr, |
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 | ||
60b5df2f | 279 | static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output, |
779e6e1c JG |
280 | unsigned int input) |
281 | { | |
282 | int cc; | |
283 | ||
284 | if (!need_siga_sync(q)) | |
285 | return 0; | |
286 | ||
7a0b4cbc | 287 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr); |
779e6e1c JG |
288 | qdio_perf_stat_inc(&perf_stats.siga_sync); |
289 | ||
290 | cc = do_siga_sync(q->irq_ptr->schid, output, input); | |
22f99347 JG |
291 | if (cc) |
292 | DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc); | |
779e6e1c JG |
293 | return cc; |
294 | } | |
295 | ||
60b5df2f | 296 | static inline int qdio_siga_sync_q(struct qdio_q *q) |
779e6e1c JG |
297 | { |
298 | if (q->is_input_q) | |
299 | return qdio_siga_sync(q, 0, q->mask); | |
300 | else | |
301 | return qdio_siga_sync(q, q->mask, 0); | |
302 | } | |
303 | ||
304 | static inline int qdio_siga_sync_out(struct qdio_q *q) | |
305 | { | |
306 | return qdio_siga_sync(q, ~0U, 0); | |
307 | } | |
308 | ||
309 | static inline int qdio_siga_sync_all(struct qdio_q *q) | |
310 | { | |
311 | return qdio_siga_sync(q, ~0U, ~0U); | |
312 | } | |
313 | ||
7a0b4cbc | 314 | static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit) |
779e6e1c | 315 | { |
779e6e1c | 316 | unsigned long schid; |
7a0b4cbc JG |
317 | unsigned int fc = 0; |
318 | u64 start_time = 0; | |
319 | int cc; | |
779e6e1c | 320 | |
7a0b4cbc | 321 | if (q->u.out.use_enh_siga) |
7a0f4755 | 322 | fc = 3; |
7a0b4cbc JG |
323 | |
324 | if (is_qebsm(q)) { | |
779e6e1c JG |
325 | schid = q->irq_ptr->sch_token; |
326 | fc |= 0x80; | |
327 | } | |
7a0b4cbc JG |
328 | else |
329 | schid = *((u32 *)&q->irq_ptr->schid); | |
779e6e1c | 330 | |
779e6e1c | 331 | again: |
7a0b4cbc JG |
332 | cc = do_siga_output(schid, q->mask, busy_bit, fc); |
333 | ||
334 | /* hipersocket busy condition */ | |
335 | if (*busy_bit) { | |
336 | WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2); | |
58eb27cd | 337 | |
7a0b4cbc | 338 | if (!start_time) { |
779e6e1c | 339 | start_time = get_usecs(); |
7a0b4cbc JG |
340 | goto again; |
341 | } | |
342 | if ((get_usecs() - start_time) < QDIO_BUSY_BIT_PATIENCE) | |
779e6e1c JG |
343 | goto again; |
344 | } | |
779e6e1c JG |
345 | return cc; |
346 | } | |
347 | ||
348 | static inline int qdio_siga_input(struct qdio_q *q) | |
349 | { | |
350 | int cc; | |
351 | ||
22f99347 | 352 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr); |
779e6e1c JG |
353 | qdio_perf_stat_inc(&perf_stats.siga_in); |
354 | ||
355 | cc = do_siga_input(q->irq_ptr->schid, q->mask); | |
356 | if (cc) | |
22f99347 | 357 | DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc); |
779e6e1c JG |
358 | return cc; |
359 | } | |
360 | ||
60b5df2f | 361 | static inline void qdio_sync_after_thinint(struct qdio_q *q) |
779e6e1c JG |
362 | { |
363 | if (pci_out_supported(q)) { | |
364 | if (need_siga_sync_thinint(q)) | |
365 | qdio_siga_sync_all(q); | |
366 | else if (need_siga_sync_out_thinint(q)) | |
367 | qdio_siga_sync_out(q); | |
368 | } else | |
369 | qdio_siga_sync_q(q); | |
370 | } | |
371 | ||
60b5df2f JG |
372 | int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr, |
373 | unsigned char *state) | |
374 | { | |
375 | qdio_siga_sync_q(q); | |
376 | return get_buf_states(q, bufnr, state, 1, 0); | |
377 | } | |
378 | ||
379 | static inline void qdio_stop_polling(struct qdio_q *q) | |
779e6e1c | 380 | { |
50f769df | 381 | if (!q->u.in.polling) |
779e6e1c | 382 | return; |
50f769df | 383 | |
779e6e1c JG |
384 | q->u.in.polling = 0; |
385 | qdio_perf_stat_inc(&perf_stats.debug_stop_polling); | |
386 | ||
387 | /* show the card that we are not polling anymore */ | |
50f769df | 388 | if (is_qebsm(q)) { |
e85dea0e | 389 | set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, |
50f769df JG |
390 | q->u.in.ack_count); |
391 | q->u.in.ack_count = 0; | |
392 | } else | |
e85dea0e | 393 | set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); |
779e6e1c JG |
394 | } |
395 | ||
50f769df | 396 | static void announce_buffer_error(struct qdio_q *q, int count) |
779e6e1c | 397 | { |
7a0b4cbc | 398 | q->qdio_error |= QDIO_ERROR_SLSB_STATE; |
50f769df JG |
399 | |
400 | /* special handling for no target buffer empty */ | |
401 | if ((!q->is_input_q && | |
402 | (q->sbal[q->first_to_check]->element[15].flags & 0xff) == 0x10)) { | |
403 | qdio_perf_stat_inc(&perf_stats.outbound_target_full); | |
1d7e1500 | 404 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", |
50f769df JG |
405 | q->first_to_check); |
406 | return; | |
407 | } | |
408 | ||
22f99347 JG |
409 | DBF_ERROR("%4x BUF ERROR", SCH_NO(q)); |
410 | DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr); | |
50f769df | 411 | DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count); |
22f99347 JG |
412 | DBF_ERROR("F14:%2x F15:%2x", |
413 | q->sbal[q->first_to_check]->element[14].flags & 0xff, | |
414 | q->sbal[q->first_to_check]->element[15].flags & 0xff); | |
50f769df | 415 | } |
779e6e1c | 416 | |
50f769df JG |
417 | static inline void inbound_primed(struct qdio_q *q, int count) |
418 | { | |
419 | int new; | |
420 | ||
1d7e1500 | 421 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count); |
50f769df JG |
422 | |
423 | /* for QEBSM the ACK was already set by EQBS */ | |
424 | if (is_qebsm(q)) { | |
425 | if (!q->u.in.polling) { | |
426 | q->u.in.polling = 1; | |
427 | q->u.in.ack_count = count; | |
e85dea0e | 428 | q->u.in.ack_start = q->first_to_check; |
50f769df JG |
429 | return; |
430 | } | |
431 | ||
432 | /* delete the previous ACK's */ | |
e85dea0e | 433 | set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, |
50f769df JG |
434 | q->u.in.ack_count); |
435 | q->u.in.ack_count = count; | |
e85dea0e | 436 | q->u.in.ack_start = q->first_to_check; |
50f769df JG |
437 | return; |
438 | } | |
439 | ||
440 | /* | |
441 | * ACK the newest buffer. The ACK will be removed in qdio_stop_polling | |
442 | * or by the next inbound run. | |
443 | */ | |
444 | new = add_buf(q->first_to_check, count - 1); | |
445 | if (q->u.in.polling) { | |
446 | /* reset the previous ACK but first set the new one */ | |
447 | set_buf_state(q, new, SLSB_P_INPUT_ACK); | |
e85dea0e | 448 | set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); |
3fdf1e18 | 449 | } else { |
50f769df | 450 | q->u.in.polling = 1; |
3fdf1e18 | 451 | set_buf_state(q, new, SLSB_P_INPUT_ACK); |
50f769df JG |
452 | } |
453 | ||
e85dea0e | 454 | q->u.in.ack_start = new; |
50f769df JG |
455 | count--; |
456 | if (!count) | |
457 | return; | |
6541f7b6 JG |
458 | /* need to change ALL buffers to get more interrupts */ |
459 | set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count); | |
779e6e1c JG |
460 | } |
461 | ||
462 | static int get_inbound_buffer_frontier(struct qdio_q *q) | |
463 | { | |
464 | int count, stop; | |
465 | unsigned char state; | |
466 | ||
779e6e1c JG |
467 | /* |
468 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved | |
469 | * would return 0. | |
470 | */ | |
471 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); | |
472 | stop = add_buf(q->first_to_check, count); | |
473 | ||
779e6e1c JG |
474 | if (q->first_to_check == stop) |
475 | goto out; | |
476 | ||
36e3e721 JG |
477 | /* |
478 | * No siga sync here, as a PCI or we after a thin interrupt | |
479 | * already sync'ed the queues. | |
480 | */ | |
50f769df | 481 | count = get_buf_states(q, q->first_to_check, &state, count, 1); |
779e6e1c JG |
482 | if (!count) |
483 | goto out; | |
484 | ||
485 | switch (state) { | |
486 | case SLSB_P_INPUT_PRIMED: | |
50f769df | 487 | inbound_primed(q, count); |
779e6e1c JG |
488 | q->first_to_check = add_buf(q->first_to_check, count); |
489 | atomic_sub(count, &q->nr_buf_used); | |
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) { | |
569 | qdio_perf_stat_inc(&perf_stats.inbound_handler); | |
1d7e1500 JG |
570 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count); |
571 | } else | |
572 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x", | |
573 | start, count); | |
9c8a08d7 JG |
574 | |
575 | q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count, | |
576 | q->irq_ptr->int_parm); | |
779e6e1c JG |
577 | |
578 | /* for the next time */ | |
9c8a08d7 | 579 | q->first_to_kick = end; |
779e6e1c JG |
580 | q->qdio_error = 0; |
581 | } | |
582 | ||
583 | static void __qdio_inbound_processing(struct qdio_q *q) | |
584 | { | |
585 | qdio_perf_stat_inc(&perf_stats.tasklet_inbound); | |
586 | again: | |
587 | if (!qdio_inbound_q_moved(q)) | |
588 | return; | |
589 | ||
9c8a08d7 | 590 | qdio_kick_handler(q); |
779e6e1c JG |
591 | |
592 | if (!qdio_inbound_q_done(q)) | |
593 | /* means poll time is not yet over */ | |
594 | goto again; | |
595 | ||
596 | qdio_stop_polling(q); | |
597 | /* | |
598 | * We need to check again to not lose initiative after | |
599 | * resetting the ACK state. | |
600 | */ | |
601 | if (!qdio_inbound_q_done(q)) | |
602 | goto again; | |
603 | } | |
604 | ||
779e6e1c JG |
605 | void qdio_inbound_processing(unsigned long data) |
606 | { | |
607 | struct qdio_q *q = (struct qdio_q *)data; | |
608 | __qdio_inbound_processing(q); | |
609 | } | |
610 | ||
611 | static int get_outbound_buffer_frontier(struct qdio_q *q) | |
612 | { | |
613 | int count, stop; | |
614 | unsigned char state; | |
615 | ||
616 | if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) || | |
617 | (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q))) | |
618 | qdio_siga_sync_q(q); | |
619 | ||
620 | /* | |
621 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved | |
622 | * would return 0. | |
623 | */ | |
624 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); | |
625 | stop = add_buf(q->first_to_check, count); | |
626 | ||
779e6e1c JG |
627 | if (q->first_to_check == stop) |
628 | return q->first_to_check; | |
629 | ||
50f769df | 630 | count = get_buf_states(q, q->first_to_check, &state, count, 0); |
779e6e1c JG |
631 | if (!count) |
632 | return q->first_to_check; | |
633 | ||
634 | switch (state) { | |
635 | case SLSB_P_OUTPUT_EMPTY: | |
636 | /* the adapter got it */ | |
1d7e1500 | 637 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %02x", q->nr, count); |
779e6e1c JG |
638 | |
639 | atomic_sub(count, &q->nr_buf_used); | |
640 | q->first_to_check = add_buf(q->first_to_check, count); | |
36e3e721 | 641 | break; |
779e6e1c | 642 | case SLSB_P_OUTPUT_ERROR: |
50f769df | 643 | announce_buffer_error(q, count); |
779e6e1c JG |
644 | /* process the buffer, the upper layer will take care of it */ |
645 | q->first_to_check = add_buf(q->first_to_check, count); | |
646 | atomic_sub(count, &q->nr_buf_used); | |
647 | break; | |
648 | case SLSB_CU_OUTPUT_PRIMED: | |
649 | /* the adapter has not fetched the output yet */ | |
22f99347 | 650 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr); |
779e6e1c JG |
651 | break; |
652 | case SLSB_P_OUTPUT_NOT_INIT: | |
653 | case SLSB_P_OUTPUT_HALTED: | |
654 | break; | |
655 | default: | |
656 | BUG(); | |
657 | } | |
658 | return q->first_to_check; | |
659 | } | |
660 | ||
661 | /* all buffers processed? */ | |
662 | static inline int qdio_outbound_q_done(struct qdio_q *q) | |
663 | { | |
664 | return atomic_read(&q->nr_buf_used) == 0; | |
665 | } | |
666 | ||
667 | static inline int qdio_outbound_q_moved(struct qdio_q *q) | |
668 | { | |
669 | int bufnr; | |
670 | ||
671 | bufnr = get_outbound_buffer_frontier(q); | |
672 | ||
e85dea0e JG |
673 | if ((bufnr != q->last_move) || q->qdio_error) { |
674 | q->last_move = bufnr; | |
22f99347 | 675 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr); |
779e6e1c JG |
676 | return 1; |
677 | } else | |
678 | return 0; | |
679 | } | |
680 | ||
d303b6fd | 681 | static int qdio_kick_outbound_q(struct qdio_q *q) |
779e6e1c | 682 | { |
7a0b4cbc JG |
683 | unsigned int busy_bit; |
684 | int cc; | |
779e6e1c JG |
685 | |
686 | if (!need_siga_out(q)) | |
d303b6fd | 687 | return 0; |
779e6e1c | 688 | |
7a0b4cbc JG |
689 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr); |
690 | qdio_perf_stat_inc(&perf_stats.siga_out); | |
691 | ||
692 | cc = qdio_siga_output(q, &busy_bit); | |
693 | switch (cc) { | |
779e6e1c | 694 | case 0: |
779e6e1c | 695 | break; |
7a0b4cbc JG |
696 | case 2: |
697 | if (busy_bit) { | |
698 | DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr); | |
d303b6fd JG |
699 | cc |= QDIO_ERROR_SIGA_BUSY; |
700 | } else | |
701 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr); | |
7a0b4cbc JG |
702 | break; |
703 | case 1: | |
704 | case 3: | |
705 | DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc); | |
7a0b4cbc | 706 | break; |
779e6e1c | 707 | } |
d303b6fd | 708 | return cc; |
779e6e1c JG |
709 | } |
710 | ||
779e6e1c JG |
711 | static void __qdio_outbound_processing(struct qdio_q *q) |
712 | { | |
779e6e1c | 713 | qdio_perf_stat_inc(&perf_stats.tasklet_outbound); |
779e6e1c JG |
714 | BUG_ON(atomic_read(&q->nr_buf_used) < 0); |
715 | ||
716 | if (qdio_outbound_q_moved(q)) | |
9c8a08d7 | 717 | qdio_kick_handler(q); |
779e6e1c | 718 | |
c38f9608 | 719 | if (queue_type(q) == QDIO_ZFCP_QFMT) |
779e6e1c | 720 | if (!pci_out_supported(q) && !qdio_outbound_q_done(q)) |
c38f9608 | 721 | goto sched; |
779e6e1c JG |
722 | |
723 | /* bail out for HiperSockets unicast queues */ | |
724 | if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q)) | |
725 | return; | |
726 | ||
4bcb3a37 | 727 | if ((queue_type(q) == QDIO_IQDIO_QFMT) && |
c38f9608 JG |
728 | (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL) |
729 | goto sched; | |
4bcb3a37 | 730 | |
779e6e1c JG |
731 | if (q->u.out.pci_out_enabled) |
732 | return; | |
733 | ||
734 | /* | |
735 | * Now we know that queue type is either qeth without pci enabled | |
736 | * or HiperSockets multicast. Make sure buffer switch from PRIMED to | |
737 | * EMPTY is noticed and outbound_handler is called after some time. | |
738 | */ | |
739 | if (qdio_outbound_q_done(q)) | |
740 | del_timer(&q->u.out.timer); | |
741 | else { | |
742 | if (!timer_pending(&q->u.out.timer)) { | |
743 | mod_timer(&q->u.out.timer, jiffies + 10 * HZ); | |
744 | qdio_perf_stat_inc(&perf_stats.debug_tl_out_timer); | |
745 | } | |
746 | } | |
c38f9608 JG |
747 | return; |
748 | ||
749 | sched: | |
750 | if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) | |
751 | return; | |
752 | tasklet_schedule(&q->tasklet); | |
779e6e1c JG |
753 | } |
754 | ||
755 | /* outbound tasklet */ | |
756 | void qdio_outbound_processing(unsigned long data) | |
757 | { | |
758 | struct qdio_q *q = (struct qdio_q *)data; | |
759 | __qdio_outbound_processing(q); | |
760 | } | |
761 | ||
762 | void qdio_outbound_timer(unsigned long data) | |
763 | { | |
764 | struct qdio_q *q = (struct qdio_q *)data; | |
c38f9608 JG |
765 | |
766 | if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) | |
767 | return; | |
779e6e1c JG |
768 | tasklet_schedule(&q->tasklet); |
769 | } | |
770 | ||
60b5df2f | 771 | static inline void qdio_check_outbound_after_thinint(struct qdio_q *q) |
779e6e1c JG |
772 | { |
773 | struct qdio_q *out; | |
774 | int i; | |
775 | ||
776 | if (!pci_out_supported(q)) | |
777 | return; | |
778 | ||
779 | for_each_output_queue(q->irq_ptr, out, i) | |
780 | if (!qdio_outbound_q_done(out)) | |
781 | tasklet_schedule(&out->tasklet); | |
782 | } | |
783 | ||
60b5df2f JG |
784 | static void __tiqdio_inbound_processing(struct qdio_q *q) |
785 | { | |
786 | qdio_perf_stat_inc(&perf_stats.thinint_inbound); | |
787 | qdio_sync_after_thinint(q); | |
788 | ||
789 | /* | |
790 | * The interrupt could be caused by a PCI request. Check the | |
791 | * PCI capable outbound queues. | |
792 | */ | |
793 | qdio_check_outbound_after_thinint(q); | |
794 | ||
795 | if (!qdio_inbound_q_moved(q)) | |
796 | return; | |
797 | ||
798 | qdio_kick_handler(q); | |
799 | ||
9a2c160a | 800 | if (!qdio_inbound_q_done(q)) { |
60b5df2f | 801 | qdio_perf_stat_inc(&perf_stats.thinint_inbound_loop); |
e2910bcf | 802 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) { |
60b5df2f | 803 | tasklet_schedule(&q->tasklet); |
e2910bcf JG |
804 | return; |
805 | } | |
60b5df2f JG |
806 | } |
807 | ||
808 | qdio_stop_polling(q); | |
809 | /* | |
810 | * We need to check again to not lose initiative after | |
811 | * resetting the ACK state. | |
812 | */ | |
9a2c160a | 813 | if (!qdio_inbound_q_done(q)) { |
60b5df2f JG |
814 | qdio_perf_stat_inc(&perf_stats.thinint_inbound_loop2); |
815 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) | |
816 | tasklet_schedule(&q->tasklet); | |
817 | } | |
818 | } | |
819 | ||
820 | void tiqdio_inbound_processing(unsigned long data) | |
821 | { | |
822 | struct qdio_q *q = (struct qdio_q *)data; | |
823 | __tiqdio_inbound_processing(q); | |
824 | } | |
825 | ||
779e6e1c JG |
826 | static inline void qdio_set_state(struct qdio_irq *irq_ptr, |
827 | enum qdio_irq_states state) | |
828 | { | |
22f99347 | 829 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state); |
779e6e1c JG |
830 | |
831 | irq_ptr->state = state; | |
832 | mb(); | |
833 | } | |
834 | ||
22f99347 | 835 | static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb) |
779e6e1c | 836 | { |
779e6e1c | 837 | if (irb->esw.esw0.erw.cons) { |
22f99347 JG |
838 | DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no); |
839 | DBF_ERROR_HEX(irb, 64); | |
840 | DBF_ERROR_HEX(irb->ecw, 64); | |
779e6e1c JG |
841 | } |
842 | } | |
843 | ||
844 | /* PCI interrupt handler */ | |
845 | static void qdio_int_handler_pci(struct qdio_irq *irq_ptr) | |
846 | { | |
847 | int i; | |
848 | struct qdio_q *q; | |
849 | ||
c38f9608 JG |
850 | if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) |
851 | return; | |
852 | ||
779e6e1c JG |
853 | qdio_perf_stat_inc(&perf_stats.pci_int); |
854 | ||
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 JG |
924 | |
925 | qdio_perf_stat_inc(&perf_stats.qdio_int); | |
926 | ||
927 | if (!intparm || !irq_ptr) { | |
22f99347 | 928 | DBF_ERROR("qint:%4x", cdev->private->schid.sch_no); |
779e6e1c JG |
929 | return; |
930 | } | |
931 | ||
932 | if (IS_ERR(irb)) { | |
933 | switch (PTR_ERR(irb)) { | |
934 | case -EIO: | |
22f99347 | 935 | DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no); |
75cb71f3 JG |
936 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); |
937 | wake_up(&cdev->private->wait_q); | |
779e6e1c JG |
938 | return; |
939 | default: | |
940 | WARN_ON(1); | |
941 | return; | |
942 | } | |
943 | } | |
22f99347 | 944 | qdio_irq_check_sense(irq_ptr, irb); |
779e6e1c JG |
945 | cstat = irb->scsw.cmd.cstat; |
946 | dstat = irb->scsw.cmd.dstat; | |
947 | ||
948 | switch (irq_ptr->state) { | |
949 | case QDIO_IRQ_STATE_INACTIVE: | |
950 | qdio_establish_handle_irq(cdev, cstat, dstat); | |
951 | break; | |
779e6e1c JG |
952 | case QDIO_IRQ_STATE_CLEANUP: |
953 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
954 | break; | |
779e6e1c JG |
955 | case QDIO_IRQ_STATE_ESTABLISHED: |
956 | case QDIO_IRQ_STATE_ACTIVE: | |
957 | if (cstat & SCHN_STAT_PCI) { | |
958 | qdio_int_handler_pci(irq_ptr); | |
779e6e1c JG |
959 | return; |
960 | } | |
4c575423 | 961 | if (cstat || dstat) |
779e6e1c JG |
962 | qdio_handle_activate_check(cdev, intparm, cstat, |
963 | dstat); | |
4c575423 | 964 | break; |
779e6e1c JG |
965 | default: |
966 | WARN_ON(1); | |
967 | } | |
968 | wake_up(&cdev->private->wait_q); | |
969 | } | |
970 | ||
971 | /** | |
972 | * qdio_get_ssqd_desc - get qdio subchannel description | |
973 | * @cdev: ccw device to get description for | |
bbd50e17 | 974 | * @data: where to store the ssqd |
779e6e1c | 975 | * |
bbd50e17 JG |
976 | * Returns 0 or an error code. The results of the chsc are stored in the |
977 | * specified structure. | |
779e6e1c | 978 | */ |
bbd50e17 JG |
979 | int qdio_get_ssqd_desc(struct ccw_device *cdev, |
980 | struct qdio_ssqd_desc *data) | |
779e6e1c | 981 | { |
779e6e1c | 982 | |
bbd50e17 JG |
983 | if (!cdev || !cdev->private) |
984 | return -EINVAL; | |
985 | ||
22f99347 | 986 | DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no); |
bbd50e17 | 987 | return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data); |
779e6e1c JG |
988 | } |
989 | EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc); | |
990 | ||
991 | /** | |
992 | * qdio_cleanup - shutdown queues and free data structures | |
993 | * @cdev: associated ccw device | |
994 | * @how: use halt or clear to shutdown | |
995 | * | |
700e982f JG |
996 | * This function calls qdio_shutdown() for @cdev with method @how. |
997 | * and qdio_free(). The qdio_free() return value is ignored since | |
998 | * !irq_ptr is already checked. | |
779e6e1c JG |
999 | */ |
1000 | int qdio_cleanup(struct ccw_device *cdev, int how) | |
1001 | { | |
22f99347 | 1002 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
779e6e1c JG |
1003 | int rc; |
1004 | ||
779e6e1c JG |
1005 | if (!irq_ptr) |
1006 | return -ENODEV; | |
1007 | ||
779e6e1c | 1008 | rc = qdio_shutdown(cdev, how); |
700e982f JG |
1009 | |
1010 | qdio_free(cdev); | |
779e6e1c JG |
1011 | return rc; |
1012 | } | |
1013 | EXPORT_SYMBOL_GPL(qdio_cleanup); | |
1014 | ||
1015 | static void qdio_shutdown_queues(struct ccw_device *cdev) | |
1016 | { | |
1017 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1018 | struct qdio_q *q; | |
1019 | int i; | |
1020 | ||
1021 | for_each_input_queue(irq_ptr, q, i) | |
c38f9608 | 1022 | tasklet_kill(&q->tasklet); |
779e6e1c JG |
1023 | |
1024 | for_each_output_queue(irq_ptr, q, i) { | |
779e6e1c | 1025 | del_timer(&q->u.out.timer); |
c38f9608 | 1026 | tasklet_kill(&q->tasklet); |
779e6e1c JG |
1027 | } |
1028 | } | |
1029 | ||
1030 | /** | |
1031 | * qdio_shutdown - shut down a qdio subchannel | |
1032 | * @cdev: associated ccw device | |
1033 | * @how: use halt or clear to shutdown | |
1034 | */ | |
1035 | int qdio_shutdown(struct ccw_device *cdev, int how) | |
1036 | { | |
22f99347 | 1037 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
779e6e1c JG |
1038 | int rc; |
1039 | unsigned long flags; | |
779e6e1c | 1040 | |
779e6e1c JG |
1041 | if (!irq_ptr) |
1042 | return -ENODEV; | |
1043 | ||
b4547402 | 1044 | BUG_ON(irqs_disabled()); |
22f99347 JG |
1045 | DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no); |
1046 | ||
779e6e1c JG |
1047 | mutex_lock(&irq_ptr->setup_mutex); |
1048 | /* | |
1049 | * Subchannel was already shot down. We cannot prevent being called | |
1050 | * twice since cio may trigger a shutdown asynchronously. | |
1051 | */ | |
1052 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { | |
1053 | mutex_unlock(&irq_ptr->setup_mutex); | |
1054 | return 0; | |
1055 | } | |
1056 | ||
c38f9608 JG |
1057 | /* |
1058 | * Indicate that the device is going down. Scheduling the queue | |
1059 | * tasklets is forbidden from here on. | |
1060 | */ | |
1061 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); | |
1062 | ||
779e6e1c JG |
1063 | tiqdio_remove_input_queues(irq_ptr); |
1064 | qdio_shutdown_queues(cdev); | |
1065 | qdio_shutdown_debug_entries(irq_ptr, cdev); | |
1066 | ||
1067 | /* cleanup subchannel */ | |
1068 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1069 | ||
1070 | if (how & QDIO_FLAG_CLEANUP_USING_CLEAR) | |
1071 | rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP); | |
1072 | else | |
1073 | /* default behaviour is halt */ | |
1074 | rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP); | |
1075 | if (rc) { | |
22f99347 JG |
1076 | DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no); |
1077 | DBF_ERROR("rc:%4d", rc); | |
779e6e1c JG |
1078 | goto no_cleanup; |
1079 | } | |
1080 | ||
1081 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP); | |
1082 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1083 | wait_event_interruptible_timeout(cdev->private->wait_q, | |
1084 | irq_ptr->state == QDIO_IRQ_STATE_INACTIVE || | |
1085 | irq_ptr->state == QDIO_IRQ_STATE_ERR, | |
1086 | 10 * HZ); | |
1087 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1088 | ||
1089 | no_cleanup: | |
1090 | qdio_shutdown_thinint(irq_ptr); | |
1091 | ||
1092 | /* restore interrupt handler */ | |
1093 | if ((void *)cdev->handler == (void *)qdio_int_handler) | |
1094 | cdev->handler = irq_ptr->orig_handler; | |
1095 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1096 | ||
1097 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1098 | mutex_unlock(&irq_ptr->setup_mutex); | |
779e6e1c JG |
1099 | if (rc) |
1100 | return rc; | |
1101 | return 0; | |
1102 | } | |
1103 | EXPORT_SYMBOL_GPL(qdio_shutdown); | |
1104 | ||
1105 | /** | |
1106 | * qdio_free - free data structures for a qdio subchannel | |
1107 | * @cdev: associated ccw device | |
1108 | */ | |
1109 | int qdio_free(struct ccw_device *cdev) | |
1110 | { | |
22f99347 | 1111 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
58eb27cd | 1112 | |
779e6e1c JG |
1113 | if (!irq_ptr) |
1114 | return -ENODEV; | |
1115 | ||
22f99347 | 1116 | DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no); |
779e6e1c | 1117 | mutex_lock(&irq_ptr->setup_mutex); |
22f99347 JG |
1118 | |
1119 | if (irq_ptr->debug_area != NULL) { | |
1120 | debug_unregister(irq_ptr->debug_area); | |
1121 | irq_ptr->debug_area = NULL; | |
1122 | } | |
779e6e1c JG |
1123 | cdev->private->qdio_data = NULL; |
1124 | mutex_unlock(&irq_ptr->setup_mutex); | |
1125 | ||
1126 | qdio_release_memory(irq_ptr); | |
1127 | return 0; | |
1128 | } | |
1129 | EXPORT_SYMBOL_GPL(qdio_free); | |
1130 | ||
1131 | /** | |
1132 | * qdio_initialize - allocate and establish queues for a qdio subchannel | |
1133 | * @init_data: initialization data | |
1134 | * | |
1135 | * This function first allocates queues via qdio_allocate() and on success | |
1136 | * establishes them via qdio_establish(). | |
1137 | */ | |
1138 | int qdio_initialize(struct qdio_initialize *init_data) | |
1139 | { | |
1140 | int rc; | |
779e6e1c JG |
1141 | |
1142 | rc = qdio_allocate(init_data); | |
1143 | if (rc) | |
1144 | return rc; | |
1145 | ||
1146 | rc = qdio_establish(init_data); | |
1147 | if (rc) | |
1148 | qdio_free(init_data->cdev); | |
1149 | return rc; | |
1150 | } | |
1151 | EXPORT_SYMBOL_GPL(qdio_initialize); | |
1152 | ||
1153 | /** | |
1154 | * qdio_allocate - allocate qdio queues and associated data | |
1155 | * @init_data: initialization data | |
1156 | */ | |
1157 | int qdio_allocate(struct qdio_initialize *init_data) | |
1158 | { | |
1159 | struct qdio_irq *irq_ptr; | |
779e6e1c | 1160 | |
22f99347 | 1161 | DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no); |
779e6e1c JG |
1162 | |
1163 | if ((init_data->no_input_qs && !init_data->input_handler) || | |
1164 | (init_data->no_output_qs && !init_data->output_handler)) | |
1165 | return -EINVAL; | |
1166 | ||
1167 | if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) || | |
1168 | (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)) | |
1169 | return -EINVAL; | |
1170 | ||
1171 | if ((!init_data->input_sbal_addr_array) || | |
1172 | (!init_data->output_sbal_addr_array)) | |
1173 | return -EINVAL; | |
1174 | ||
779e6e1c JG |
1175 | /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */ |
1176 | irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
1177 | if (!irq_ptr) | |
1178 | goto out_err; | |
779e6e1c JG |
1179 | |
1180 | mutex_init(&irq_ptr->setup_mutex); | |
22f99347 | 1181 | qdio_allocate_dbf(init_data, irq_ptr); |
779e6e1c JG |
1182 | |
1183 | /* | |
1184 | * Allocate a page for the chsc calls in qdio_establish. | |
1185 | * Must be pre-allocated since a zfcp recovery will call | |
1186 | * qdio_establish. In case of low memory and swap on a zfcp disk | |
1187 | * we may not be able to allocate memory otherwise. | |
1188 | */ | |
1189 | irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL); | |
1190 | if (!irq_ptr->chsc_page) | |
1191 | goto out_rel; | |
1192 | ||
1193 | /* qdr is used in ccw1.cda which is u32 */ | |
3b8e3004 | 1194 | irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
779e6e1c JG |
1195 | if (!irq_ptr->qdr) |
1196 | goto out_rel; | |
1197 | WARN_ON((unsigned long)irq_ptr->qdr & 0xfff); | |
1198 | ||
779e6e1c JG |
1199 | if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs, |
1200 | init_data->no_output_qs)) | |
1201 | goto out_rel; | |
1202 | ||
1203 | init_data->cdev->private->qdio_data = irq_ptr; | |
1204 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1205 | return 0; | |
1206 | out_rel: | |
1207 | qdio_release_memory(irq_ptr); | |
1208 | out_err: | |
1209 | return -ENOMEM; | |
1210 | } | |
1211 | EXPORT_SYMBOL_GPL(qdio_allocate); | |
1212 | ||
1213 | /** | |
1214 | * qdio_establish - establish queues on a qdio subchannel | |
1215 | * @init_data: initialization data | |
1216 | */ | |
1217 | int qdio_establish(struct qdio_initialize *init_data) | |
1218 | { | |
779e6e1c JG |
1219 | struct qdio_irq *irq_ptr; |
1220 | struct ccw_device *cdev = init_data->cdev; | |
1221 | unsigned long saveflags; | |
1222 | int rc; | |
1223 | ||
22f99347 | 1224 | DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no); |
58eb27cd | 1225 | |
779e6e1c JG |
1226 | irq_ptr = cdev->private->qdio_data; |
1227 | if (!irq_ptr) | |
1228 | return -ENODEV; | |
1229 | ||
1230 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1231 | return -EINVAL; | |
1232 | ||
779e6e1c JG |
1233 | mutex_lock(&irq_ptr->setup_mutex); |
1234 | qdio_setup_irq(init_data); | |
1235 | ||
1236 | rc = qdio_establish_thinint(irq_ptr); | |
1237 | if (rc) { | |
1238 | mutex_unlock(&irq_ptr->setup_mutex); | |
1239 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1240 | return rc; | |
1241 | } | |
1242 | ||
1243 | /* establish q */ | |
1244 | irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd; | |
1245 | irq_ptr->ccw.flags = CCW_FLAG_SLI; | |
1246 | irq_ptr->ccw.count = irq_ptr->equeue.count; | |
1247 | irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr); | |
1248 | ||
1249 | spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); | |
1250 | ccw_device_set_options_mask(cdev, 0); | |
1251 | ||
1252 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0); | |
1253 | if (rc) { | |
22f99347 JG |
1254 | DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no); |
1255 | DBF_ERROR("rc:%4x", rc); | |
779e6e1c JG |
1256 | } |
1257 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); | |
1258 | ||
1259 | if (rc) { | |
1260 | mutex_unlock(&irq_ptr->setup_mutex); | |
1261 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1262 | return rc; | |
1263 | } | |
1264 | ||
1265 | wait_event_interruptible_timeout(cdev->private->wait_q, | |
1266 | irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED || | |
1267 | irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ); | |
1268 | ||
1269 | if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) { | |
1270 | mutex_unlock(&irq_ptr->setup_mutex); | |
1271 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1272 | return -EIO; | |
1273 | } | |
1274 | ||
1275 | qdio_setup_ssqd_info(irq_ptr); | |
22f99347 JG |
1276 | DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc); |
1277 | DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac); | |
779e6e1c JG |
1278 | |
1279 | /* qebsm is now setup if available, initialize buffer states */ | |
1280 | qdio_init_buf_states(irq_ptr); | |
1281 | ||
1282 | mutex_unlock(&irq_ptr->setup_mutex); | |
1283 | qdio_print_subchannel_info(irq_ptr, cdev); | |
1284 | qdio_setup_debug_entries(irq_ptr, cdev); | |
1285 | return 0; | |
1286 | } | |
1287 | EXPORT_SYMBOL_GPL(qdio_establish); | |
1288 | ||
1289 | /** | |
1290 | * qdio_activate - activate queues on a qdio subchannel | |
1291 | * @cdev: associated cdev | |
1292 | */ | |
1293 | int qdio_activate(struct ccw_device *cdev) | |
1294 | { | |
1295 | struct qdio_irq *irq_ptr; | |
1296 | int rc; | |
1297 | unsigned long saveflags; | |
779e6e1c | 1298 | |
22f99347 | 1299 | DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no); |
58eb27cd | 1300 | |
779e6e1c JG |
1301 | irq_ptr = cdev->private->qdio_data; |
1302 | if (!irq_ptr) | |
1303 | return -ENODEV; | |
1304 | ||
1305 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1306 | return -EINVAL; | |
1307 | ||
1308 | mutex_lock(&irq_ptr->setup_mutex); | |
1309 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { | |
1310 | rc = -EBUSY; | |
1311 | goto out; | |
1312 | } | |
1313 | ||
779e6e1c JG |
1314 | irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd; |
1315 | irq_ptr->ccw.flags = CCW_FLAG_SLI; | |
1316 | irq_ptr->ccw.count = irq_ptr->aqueue.count; | |
1317 | irq_ptr->ccw.cda = 0; | |
1318 | ||
1319 | spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); | |
1320 | ccw_device_set_options(cdev, CCWDEV_REPORT_ALL); | |
1321 | ||
1322 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE, | |
1323 | 0, DOIO_DENY_PREFETCH); | |
1324 | if (rc) { | |
22f99347 JG |
1325 | DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no); |
1326 | DBF_ERROR("rc:%4x", rc); | |
779e6e1c JG |
1327 | } |
1328 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); | |
1329 | ||
1330 | if (rc) | |
1331 | goto out; | |
1332 | ||
1333 | if (is_thinint_irq(irq_ptr)) | |
1334 | tiqdio_add_input_queues(irq_ptr); | |
1335 | ||
1336 | /* wait for subchannel to become active */ | |
1337 | msleep(5); | |
1338 | ||
1339 | switch (irq_ptr->state) { | |
1340 | case QDIO_IRQ_STATE_STOPPED: | |
1341 | case QDIO_IRQ_STATE_ERR: | |
e4c14e20 JG |
1342 | rc = -EIO; |
1343 | break; | |
779e6e1c JG |
1344 | default: |
1345 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE); | |
1346 | rc = 0; | |
1347 | } | |
1348 | out: | |
1349 | mutex_unlock(&irq_ptr->setup_mutex); | |
1350 | return rc; | |
1351 | } | |
1352 | EXPORT_SYMBOL_GPL(qdio_activate); | |
1353 | ||
1354 | static inline int buf_in_between(int bufnr, int start, int count) | |
1355 | { | |
1356 | int end = add_buf(start, count); | |
1357 | ||
1358 | if (end > start) { | |
1359 | if (bufnr >= start && bufnr < end) | |
1360 | return 1; | |
1361 | else | |
1362 | return 0; | |
1363 | } | |
1364 | ||
1365 | /* wrap-around case */ | |
1366 | if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) || | |
1367 | (bufnr < end)) | |
1368 | return 1; | |
1369 | else | |
1370 | return 0; | |
1371 | } | |
1372 | ||
1373 | /** | |
1374 | * handle_inbound - reset processed input buffers | |
1375 | * @q: queue containing the buffers | |
1376 | * @callflags: flags | |
1377 | * @bufnr: first buffer to process | |
1378 | * @count: how many buffers are emptied | |
1379 | */ | |
d303b6fd JG |
1380 | static int handle_inbound(struct qdio_q *q, unsigned int callflags, |
1381 | int bufnr, int count) | |
779e6e1c | 1382 | { |
d303b6fd | 1383 | int used, diff; |
779e6e1c | 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 JG |
1439 | |
1440 | qdio_perf_stat_inc(&perf_stats.outbound_handler); | |
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 | ||
1446 | if (callflags & QDIO_FLAG_PCI_OUT) | |
1447 | q->u.out.pci_out_enabled = 1; | |
1448 | else | |
1449 | q->u.out.pci_out_enabled = 0; | |
1450 | ||
1451 | if (queue_type(q) == QDIO_IQDIO_QFMT) { | |
1452 | if (multicast_outbound(q)) | |
d303b6fd | 1453 | rc = qdio_kick_outbound_q(q); |
779e6e1c | 1454 | else |
7a0f4755 KDW |
1455 | if ((q->irq_ptr->ssqd_desc.mmwc > 1) && |
1456 | (count > 1) && | |
1457 | (count <= q->irq_ptr->ssqd_desc.mmwc)) { | |
1458 | /* exploit enhanced SIGA */ | |
1459 | q->u.out.use_enh_siga = 1; | |
d303b6fd | 1460 | rc = qdio_kick_outbound_q(q); |
7a0f4755 KDW |
1461 | } else { |
1462 | /* | |
1463 | * One siga-w per buffer required for unicast | |
1464 | * HiperSockets. | |
1465 | */ | |
1466 | q->u.out.use_enh_siga = 0; | |
d303b6fd JG |
1467 | while (count--) { |
1468 | rc = qdio_kick_outbound_q(q); | |
1469 | if (rc) | |
1470 | goto out; | |
1471 | } | |
7a0f4755 | 1472 | } |
779e6e1c JG |
1473 | goto out; |
1474 | } | |
1475 | ||
1476 | if (need_siga_sync(q)) { | |
1477 | qdio_siga_sync_q(q); | |
1478 | goto out; | |
1479 | } | |
1480 | ||
1481 | /* try to fast requeue buffers */ | |
50f769df | 1482 | get_buf_state(q, prev_buf(bufnr), &state, 0); |
779e6e1c | 1483 | if (state != SLSB_CU_OUTPUT_PRIMED) |
d303b6fd | 1484 | rc = qdio_kick_outbound_q(q); |
1d7e1500 | 1485 | else |
779e6e1c | 1486 | qdio_perf_stat_inc(&perf_stats.fast_requeue); |
1d7e1500 | 1487 | |
779e6e1c | 1488 | out: |
779e6e1c | 1489 | tasklet_schedule(&q->tasklet); |
d303b6fd | 1490 | return rc; |
779e6e1c JG |
1491 | } |
1492 | ||
1493 | /** | |
1494 | * do_QDIO - process input or output buffers | |
1495 | * @cdev: associated ccw_device for the qdio subchannel | |
1496 | * @callflags: input or output and special flags from the program | |
1497 | * @q_nr: queue number | |
1498 | * @bufnr: buffer number | |
1499 | * @count: how many buffers to process | |
1500 | */ | |
1501 | int do_QDIO(struct ccw_device *cdev, unsigned int callflags, | |
6618241b | 1502 | int q_nr, unsigned int bufnr, unsigned int count) |
779e6e1c JG |
1503 | { |
1504 | struct qdio_irq *irq_ptr; | |
779e6e1c | 1505 | |
6618241b | 1506 | if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q) |
779e6e1c JG |
1507 | return -EINVAL; |
1508 | ||
779e6e1c JG |
1509 | irq_ptr = cdev->private->qdio_data; |
1510 | if (!irq_ptr) | |
1511 | return -ENODEV; | |
1512 | ||
1d7e1500 JG |
1513 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, |
1514 | "do%02x b:%02x c:%02x", callflags, bufnr, count); | |
779e6e1c JG |
1515 | |
1516 | if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE) | |
1517 | return -EBUSY; | |
1518 | ||
1519 | if (callflags & QDIO_FLAG_SYNC_INPUT) | |
d303b6fd JG |
1520 | return handle_inbound(irq_ptr->input_qs[q_nr], |
1521 | callflags, bufnr, count); | |
779e6e1c | 1522 | else if (callflags & QDIO_FLAG_SYNC_OUTPUT) |
d303b6fd JG |
1523 | return handle_outbound(irq_ptr->output_qs[q_nr], |
1524 | callflags, bufnr, count); | |
1525 | return -EINVAL; | |
779e6e1c JG |
1526 | } |
1527 | EXPORT_SYMBOL_GPL(do_QDIO); | |
1528 | ||
1529 | static int __init init_QDIO(void) | |
1530 | { | |
1531 | int rc; | |
1532 | ||
1533 | rc = qdio_setup_init(); | |
1534 | if (rc) | |
1535 | return rc; | |
1536 | rc = tiqdio_allocate_memory(); | |
1537 | if (rc) | |
1538 | goto out_cache; | |
1539 | rc = qdio_debug_init(); | |
1540 | if (rc) | |
1541 | goto out_ti; | |
1542 | rc = qdio_setup_perf_stats(); | |
1543 | if (rc) | |
1544 | goto out_debug; | |
1545 | rc = tiqdio_register_thinints(); | |
1546 | if (rc) | |
1547 | goto out_perf; | |
1548 | return 0; | |
1549 | ||
1550 | out_perf: | |
1551 | qdio_remove_perf_stats(); | |
1552 | out_debug: | |
1553 | qdio_debug_exit(); | |
1554 | out_ti: | |
1555 | tiqdio_free_memory(); | |
1556 | out_cache: | |
1557 | qdio_setup_exit(); | |
1558 | return rc; | |
1559 | } | |
1560 | ||
1561 | static void __exit exit_QDIO(void) | |
1562 | { | |
1563 | tiqdio_unregister_thinints(); | |
1564 | tiqdio_free_memory(); | |
1565 | qdio_remove_perf_stats(); | |
1566 | qdio_debug_exit(); | |
1567 | qdio_setup_exit(); | |
1568 | } | |
1569 | ||
1570 | module_init(init_QDIO); | |
1571 | module_exit(exit_QDIO); |