Commit | Line | Data |
---|---|---|
779e6e1c | 1 | /* |
779e6e1c JG |
2 | * Linux for s390 qdio support, buffer handling, qdio API and module support. |
3 | * | |
a53c8fab | 4 | * Copyright IBM Corp. 2000, 2008 |
779e6e1c JG |
5 | * Author(s): Utz Bacher <utz.bacher@de.ibm.com> |
6 | * Jan Glauber <jang@linux.vnet.ibm.com> | |
7 | * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com> | |
8 | */ | |
9 | #include <linux/module.h> | |
10 | #include <linux/init.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/timer.h> | |
13 | #include <linux/delay.h> | |
5a0e3ad6 | 14 | #include <linux/gfp.h> |
104ea556 | 15 | #include <linux/io.h> |
60063497 | 16 | #include <linux/atomic.h> |
779e6e1c JG |
17 | #include <asm/debug.h> |
18 | #include <asm/qdio.h> | |
3ab121ab | 19 | #include <asm/ipl.h> |
779e6e1c JG |
20 | |
21 | #include "cio.h" | |
22 | #include "css.h" | |
23 | #include "device.h" | |
24 | #include "qdio.h" | |
25 | #include "qdio_debug.h" | |
779e6e1c JG |
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 | ||
958c0ba4 JG |
32 | static inline int do_siga_sync(unsigned long schid, |
33 | unsigned int out_mask, unsigned int in_mask, | |
34 | unsigned int fc) | |
779e6e1c | 35 | { |
958c0ba4 JG |
36 | register unsigned long __fc asm ("0") = fc; |
37 | register unsigned long __schid asm ("1") = schid; | |
779e6e1c JG |
38 | register unsigned long out asm ("2") = out_mask; |
39 | register unsigned long in asm ("3") = in_mask; | |
40 | int cc; | |
41 | ||
42 | asm volatile( | |
43 | " siga 0\n" | |
44 | " ipm %0\n" | |
45 | " srl %0,28\n" | |
46 | : "=d" (cc) | |
47 | : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc"); | |
48 | return cc; | |
49 | } | |
50 | ||
958c0ba4 JG |
51 | static inline int do_siga_input(unsigned long schid, unsigned int mask, |
52 | unsigned int fc) | |
779e6e1c | 53 | { |
958c0ba4 JG |
54 | register unsigned long __fc asm ("0") = fc; |
55 | register unsigned long __schid asm ("1") = schid; | |
779e6e1c JG |
56 | register unsigned long __mask asm ("2") = mask; |
57 | int cc; | |
58 | ||
59 | asm volatile( | |
60 | " siga 0\n" | |
61 | " ipm %0\n" | |
62 | " srl %0,28\n" | |
63 | : "=d" (cc) | |
1549d13f | 64 | : "d" (__fc), "d" (__schid), "d" (__mask) : "cc"); |
779e6e1c JG |
65 | return cc; |
66 | } | |
67 | ||
68 | /** | |
69 | * do_siga_output - perform SIGA-w/wt function | |
70 | * @schid: subchannel id or in case of QEBSM the subchannel token | |
71 | * @mask: which output queues to process | |
72 | * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer | |
73 | * @fc: function code to perform | |
74 | * | |
1549d13f | 75 | * Returns condition code. |
779e6e1c JG |
76 | * Note: For IQDC unicast queues only the highest priority queue is processed. |
77 | */ | |
78 | static inline int do_siga_output(unsigned long schid, unsigned long mask, | |
104ea556 | 79 | unsigned int *bb, unsigned int fc, |
80 | unsigned long aob) | |
779e6e1c JG |
81 | { |
82 | register unsigned long __fc asm("0") = fc; | |
83 | register unsigned long __schid asm("1") = schid; | |
84 | register unsigned long __mask asm("2") = mask; | |
104ea556 | 85 | register unsigned long __aob asm("3") = aob; |
1549d13f | 86 | int cc; |
779e6e1c JG |
87 | |
88 | asm volatile( | |
89 | " siga 0\n" | |
1549d13f | 90 | " ipm %0\n" |
779e6e1c | 91 | " srl %0,28\n" |
1549d13f JG |
92 | : "=d" (cc), "+d" (__fc), "+d" (__aob) |
93 | : "d" (__schid), "d" (__mask) | |
94 | : "cc"); | |
95 | *bb = __fc >> 31; | |
779e6e1c JG |
96 | return cc; |
97 | } | |
98 | ||
99 | static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq) | |
100 | { | |
779e6e1c JG |
101 | /* all done or next buffer state different */ |
102 | if (ccq == 0 || ccq == 32) | |
103 | return 0; | |
25f269f1 JG |
104 | /* no buffer processed */ |
105 | if (ccq == 97) | |
779e6e1c | 106 | return 1; |
25f269f1 JG |
107 | /* not all buffers processed */ |
108 | if (ccq == 96) | |
109 | return 2; | |
779e6e1c | 110 | /* notify devices immediately */ |
22f99347 | 111 | DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq); |
779e6e1c JG |
112 | return -EIO; |
113 | } | |
114 | ||
115 | /** | |
116 | * qdio_do_eqbs - extract buffer states for QEBSM | |
117 | * @q: queue to manipulate | |
118 | * @state: state of the extracted buffers | |
119 | * @start: buffer number to start at | |
120 | * @count: count of buffers to examine | |
50f769df | 121 | * @auto_ack: automatically acknowledge buffers |
779e6e1c | 122 | * |
73ac36ea | 123 | * Returns the number of successfully extracted equal buffer states. |
779e6e1c JG |
124 | * Stops processing if a state is different from the last buffers state. |
125 | */ | |
126 | static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state, | |
50f769df | 127 | int start, int count, int auto_ack) |
779e6e1c | 128 | { |
25f269f1 | 129 | int rc, tmp_count = count, tmp_start = start, nr = q->nr, retried = 0; |
779e6e1c | 130 | unsigned int ccq = 0; |
779e6e1c | 131 | |
6486cda6 | 132 | qperf_inc(q, eqbs); |
779e6e1c JG |
133 | |
134 | if (!q->is_input_q) | |
135 | nr += q->irq_ptr->nr_input_qs; | |
136 | again: | |
50f769df JG |
137 | ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count, |
138 | auto_ack); | |
779e6e1c | 139 | rc = qdio_check_ccq(q, ccq); |
25f269f1 JG |
140 | if (!rc) |
141 | return count - tmp_count; | |
22f99347 | 142 | |
779e6e1c | 143 | if (rc == 1) { |
22f99347 | 144 | DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq); |
779e6e1c JG |
145 | goto again; |
146 | } | |
147 | ||
25f269f1 | 148 | if (rc == 2) { |
25f269f1 JG |
149 | qperf_inc(q, eqbs_partial); |
150 | DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS part:%02x", | |
151 | tmp_count); | |
152 | /* | |
153 | * Retry once, if that fails bail out and process the | |
154 | * extracted buffers before trying again. | |
155 | */ | |
156 | if (!retried++) | |
157 | goto again; | |
158 | else | |
159 | return count - tmp_count; | |
779e6e1c | 160 | } |
25f269f1 JG |
161 | |
162 | DBF_ERROR("%4x EQBS ERROR", SCH_NO(q)); | |
163 | DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); | |
1549d13f | 164 | q->handler(q->irq_ptr->cdev, QDIO_ERROR_GET_BUF_STATE, |
7b3cc67d | 165 | q->nr, q->first_to_kick, count, q->irq_ptr->int_parm); |
25f269f1 | 166 | return 0; |
779e6e1c JG |
167 | } |
168 | ||
169 | /** | |
170 | * qdio_do_sqbs - set buffer states for QEBSM | |
171 | * @q: queue to manipulate | |
172 | * @state: new state of the buffers | |
173 | * @start: first buffer number to change | |
174 | * @count: how many buffers to change | |
175 | * | |
176 | * Returns the number of successfully changed buffers. | |
177 | * Does retrying until the specified count of buffer states is set or an | |
178 | * error occurs. | |
179 | */ | |
180 | static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start, | |
181 | int count) | |
182 | { | |
183 | unsigned int ccq = 0; | |
184 | int tmp_count = count, tmp_start = start; | |
185 | int nr = q->nr; | |
186 | int rc; | |
779e6e1c | 187 | |
50f769df JG |
188 | if (!count) |
189 | return 0; | |
6486cda6 | 190 | qperf_inc(q, sqbs); |
779e6e1c JG |
191 | |
192 | if (!q->is_input_q) | |
193 | nr += q->irq_ptr->nr_input_qs; | |
194 | again: | |
195 | ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count); | |
196 | rc = qdio_check_ccq(q, ccq); | |
25f269f1 | 197 | if (!rc) { |
ce1d8014 | 198 | WARN_ON_ONCE(tmp_count); |
25f269f1 JG |
199 | return count - tmp_count; |
200 | } | |
201 | ||
202 | if (rc == 1 || rc == 2) { | |
22f99347 | 203 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq); |
6486cda6 | 204 | qperf_inc(q, sqbs_partial); |
779e6e1c JG |
205 | goto again; |
206 | } | |
25f269f1 JG |
207 | |
208 | DBF_ERROR("%4x SQBS ERROR", SCH_NO(q)); | |
209 | DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); | |
1549d13f | 210 | q->handler(q->irq_ptr->cdev, QDIO_ERROR_SET_BUF_STATE, |
7b3cc67d | 211 | q->nr, q->first_to_kick, count, q->irq_ptr->int_parm); |
25f269f1 | 212 | return 0; |
779e6e1c JG |
213 | } |
214 | ||
215 | /* returns number of examined buffers and their common state in *state */ | |
216 | static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr, | |
50f769df | 217 | unsigned char *state, unsigned int count, |
104ea556 | 218 | int auto_ack, int merge_pending) |
779e6e1c JG |
219 | { |
220 | unsigned char __state = 0; | |
221 | int i; | |
222 | ||
779e6e1c | 223 | if (is_qebsm(q)) |
50f769df | 224 | return qdio_do_eqbs(q, state, bufnr, count, auto_ack); |
779e6e1c JG |
225 | |
226 | for (i = 0; i < count; i++) { | |
104ea556 | 227 | if (!__state) { |
779e6e1c | 228 | __state = q->slsb.val[bufnr]; |
104ea556 | 229 | if (merge_pending && __state == SLSB_P_OUTPUT_PENDING) |
230 | __state = SLSB_P_OUTPUT_EMPTY; | |
231 | } else if (merge_pending) { | |
232 | if ((q->slsb.val[bufnr] & __state) != __state) | |
233 | break; | |
234 | } else if (q->slsb.val[bufnr] != __state) | |
779e6e1c JG |
235 | break; |
236 | bufnr = next_buf(bufnr); | |
237 | } | |
238 | *state = __state; | |
239 | return i; | |
240 | } | |
241 | ||
60b5df2f JG |
242 | static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr, |
243 | unsigned char *state, int auto_ack) | |
779e6e1c | 244 | { |
104ea556 | 245 | return get_buf_states(q, bufnr, state, 1, auto_ack, 0); |
779e6e1c JG |
246 | } |
247 | ||
248 | /* wrap-around safe setting of slsb states, returns number of changed buffers */ | |
249 | static inline int set_buf_states(struct qdio_q *q, int bufnr, | |
250 | unsigned char state, int count) | |
251 | { | |
252 | int i; | |
253 | ||
779e6e1c JG |
254 | if (is_qebsm(q)) |
255 | return qdio_do_sqbs(q, state, bufnr, count); | |
256 | ||
257 | for (i = 0; i < count; i++) { | |
258 | xchg(&q->slsb.val[bufnr], state); | |
259 | bufnr = next_buf(bufnr); | |
260 | } | |
261 | return count; | |
262 | } | |
263 | ||
264 | static inline int set_buf_state(struct qdio_q *q, int bufnr, | |
265 | unsigned char state) | |
266 | { | |
267 | return set_buf_states(q, bufnr, state, 1); | |
268 | } | |
269 | ||
270 | /* set slsb states to initial state */ | |
c4736d96 | 271 | static void qdio_init_buf_states(struct qdio_irq *irq_ptr) |
779e6e1c JG |
272 | { |
273 | struct qdio_q *q; | |
274 | int i; | |
275 | ||
276 | for_each_input_queue(irq_ptr, q, i) | |
277 | set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT, | |
278 | QDIO_MAX_BUFFERS_PER_Q); | |
279 | for_each_output_queue(irq_ptr, q, i) | |
280 | set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT, | |
281 | QDIO_MAX_BUFFERS_PER_Q); | |
282 | } | |
283 | ||
60b5df2f | 284 | static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output, |
779e6e1c JG |
285 | unsigned int input) |
286 | { | |
958c0ba4 JG |
287 | unsigned long schid = *((u32 *) &q->irq_ptr->schid); |
288 | unsigned int fc = QDIO_SIGA_SYNC; | |
779e6e1c JG |
289 | int cc; |
290 | ||
7a0b4cbc | 291 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr); |
6486cda6 | 292 | qperf_inc(q, siga_sync); |
779e6e1c | 293 | |
958c0ba4 JG |
294 | if (is_qebsm(q)) { |
295 | schid = q->irq_ptr->sch_token; | |
296 | fc |= QDIO_SIGA_QEBSM_FLAG; | |
297 | } | |
298 | ||
299 | cc = do_siga_sync(schid, output, input, fc); | |
110da317 | 300 | if (unlikely(cc)) |
22f99347 | 301 | DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc); |
1549d13f | 302 | return (cc) ? -EIO : 0; |
779e6e1c JG |
303 | } |
304 | ||
60b5df2f | 305 | static inline int qdio_siga_sync_q(struct qdio_q *q) |
779e6e1c JG |
306 | { |
307 | if (q->is_input_q) | |
308 | return qdio_siga_sync(q, 0, q->mask); | |
309 | else | |
310 | return qdio_siga_sync(q, q->mask, 0); | |
311 | } | |
312 | ||
104ea556 | 313 | static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit, |
314 | unsigned long aob) | |
779e6e1c | 315 | { |
958c0ba4 JG |
316 | unsigned long schid = *((u32 *) &q->irq_ptr->schid); |
317 | unsigned int fc = QDIO_SIGA_WRITE; | |
7a0b4cbc | 318 | u64 start_time = 0; |
be8d97a5 | 319 | int retries = 0, cc; |
104ea556 | 320 | unsigned long laob = 0; |
321 | ||
322 | if (q->u.out.use_cq && aob != 0) { | |
323 | fc = QDIO_SIGA_WRITEQ; | |
324 | laob = aob; | |
325 | } | |
779e6e1c | 326 | |
7a0b4cbc | 327 | if (is_qebsm(q)) { |
779e6e1c | 328 | schid = q->irq_ptr->sch_token; |
958c0ba4 | 329 | fc |= QDIO_SIGA_QEBSM_FLAG; |
779e6e1c | 330 | } |
779e6e1c | 331 | again: |
104ea556 | 332 | WARN_ON_ONCE((aob && queue_type(q) != QDIO_IQDIO_QFMT) || |
333 | (aob && fc != QDIO_SIGA_WRITEQ)); | |
334 | cc = do_siga_output(schid, q->mask, busy_bit, fc, laob); | |
7a0b4cbc JG |
335 | |
336 | /* hipersocket busy condition */ | |
110da317 | 337 | if (unlikely(*busy_bit)) { |
be8d97a5 | 338 | retries++; |
58eb27cd | 339 | |
7a0b4cbc | 340 | if (!start_time) { |
8c071b0f | 341 | start_time = get_tod_clock_fast(); |
7a0b4cbc JG |
342 | goto again; |
343 | } | |
8c071b0f | 344 | if (get_tod_clock_fast() - start_time < QDIO_BUSY_BIT_PATIENCE) |
779e6e1c JG |
345 | goto again; |
346 | } | |
be8d97a5 JG |
347 | if (retries) { |
348 | DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, | |
349 | "%4x cc2 BB1:%1d", SCH_NO(q), q->nr); | |
350 | DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries); | |
351 | } | |
779e6e1c JG |
352 | return cc; |
353 | } | |
354 | ||
355 | static inline int qdio_siga_input(struct qdio_q *q) | |
356 | { | |
958c0ba4 JG |
357 | unsigned long schid = *((u32 *) &q->irq_ptr->schid); |
358 | unsigned int fc = QDIO_SIGA_READ; | |
779e6e1c JG |
359 | int cc; |
360 | ||
22f99347 | 361 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr); |
6486cda6 | 362 | qperf_inc(q, siga_read); |
779e6e1c | 363 | |
958c0ba4 JG |
364 | if (is_qebsm(q)) { |
365 | schid = q->irq_ptr->sch_token; | |
366 | fc |= QDIO_SIGA_QEBSM_FLAG; | |
367 | } | |
368 | ||
369 | cc = do_siga_input(schid, q->mask, fc); | |
110da317 | 370 | if (unlikely(cc)) |
22f99347 | 371 | DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc); |
1549d13f | 372 | return (cc) ? -EIO : 0; |
779e6e1c JG |
373 | } |
374 | ||
90adac58 JG |
375 | #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0) |
376 | #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U) | |
377 | ||
378 | static inline void qdio_sync_queues(struct qdio_q *q) | |
779e6e1c | 379 | { |
90adac58 JG |
380 | /* PCI capable outbound queues will also be scanned so sync them too */ |
381 | if (pci_out_supported(q)) | |
382 | qdio_siga_sync_all(q); | |
383 | else | |
779e6e1c JG |
384 | qdio_siga_sync_q(q); |
385 | } | |
386 | ||
60b5df2f JG |
387 | int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr, |
388 | unsigned char *state) | |
389 | { | |
90adac58 JG |
390 | if (need_siga_sync(q)) |
391 | qdio_siga_sync_q(q); | |
104ea556 | 392 | return get_buf_states(q, bufnr, state, 1, 0, 0); |
60b5df2f JG |
393 | } |
394 | ||
395 | static inline void qdio_stop_polling(struct qdio_q *q) | |
779e6e1c | 396 | { |
50f769df | 397 | if (!q->u.in.polling) |
779e6e1c | 398 | return; |
50f769df | 399 | |
779e6e1c | 400 | q->u.in.polling = 0; |
6486cda6 | 401 | qperf_inc(q, stop_polling); |
779e6e1c JG |
402 | |
403 | /* show the card that we are not polling anymore */ | |
50f769df | 404 | if (is_qebsm(q)) { |
e85dea0e | 405 | set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, |
50f769df JG |
406 | q->u.in.ack_count); |
407 | q->u.in.ack_count = 0; | |
408 | } else | |
e85dea0e | 409 | set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); |
779e6e1c JG |
410 | } |
411 | ||
d307297f JG |
412 | static inline void account_sbals(struct qdio_q *q, int count) |
413 | { | |
414 | int pos = 0; | |
415 | ||
416 | q->q_stats.nr_sbal_total += count; | |
417 | if (count == QDIO_MAX_BUFFERS_MASK) { | |
418 | q->q_stats.nr_sbals[7]++; | |
419 | return; | |
420 | } | |
421 | while (count >>= 1) | |
422 | pos++; | |
423 | q->q_stats.nr_sbals[pos]++; | |
424 | } | |
425 | ||
bffbbd2d | 426 | static void process_buffer_error(struct qdio_q *q, int count) |
779e6e1c | 427 | { |
bffbbd2d JG |
428 | unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT : |
429 | SLSB_P_OUTPUT_NOT_INIT; | |
430 | ||
1549d13f | 431 | q->qdio_error = QDIO_ERROR_SLSB_STATE; |
50f769df JG |
432 | |
433 | /* special handling for no target buffer empty */ | |
434 | if ((!q->is_input_q && | |
3ec90878 | 435 | (q->sbal[q->first_to_check]->element[15].sflags) == 0x10)) { |
6486cda6 | 436 | qperf_inc(q, target_full); |
1d7e1500 | 437 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", |
50f769df | 438 | q->first_to_check); |
2768b2de | 439 | goto set; |
50f769df JG |
440 | } |
441 | ||
22f99347 JG |
442 | DBF_ERROR("%4x BUF ERROR", SCH_NO(q)); |
443 | DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr); | |
50f769df | 444 | DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count); |
22f99347 | 445 | DBF_ERROR("F14:%2x F15:%2x", |
3ec90878 JG |
446 | q->sbal[q->first_to_check]->element[14].sflags, |
447 | q->sbal[q->first_to_check]->element[15].sflags); | |
bffbbd2d | 448 | |
2768b2de | 449 | set: |
bffbbd2d JG |
450 | /* |
451 | * Interrupts may be avoided as long as the error is present | |
452 | * so change the buffer state immediately to avoid starvation. | |
453 | */ | |
454 | set_buf_states(q, q->first_to_check, state, count); | |
50f769df | 455 | } |
779e6e1c | 456 | |
50f769df JG |
457 | static inline void inbound_primed(struct qdio_q *q, int count) |
458 | { | |
459 | int new; | |
460 | ||
1d7e1500 | 461 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count); |
50f769df JG |
462 | |
463 | /* for QEBSM the ACK was already set by EQBS */ | |
464 | if (is_qebsm(q)) { | |
465 | if (!q->u.in.polling) { | |
466 | q->u.in.polling = 1; | |
467 | q->u.in.ack_count = count; | |
e85dea0e | 468 | q->u.in.ack_start = q->first_to_check; |
50f769df JG |
469 | return; |
470 | } | |
471 | ||
472 | /* delete the previous ACK's */ | |
e85dea0e | 473 | set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, |
50f769df JG |
474 | q->u.in.ack_count); |
475 | q->u.in.ack_count = count; | |
e85dea0e | 476 | q->u.in.ack_start = q->first_to_check; |
50f769df JG |
477 | return; |
478 | } | |
479 | ||
480 | /* | |
481 | * ACK the newest buffer. The ACK will be removed in qdio_stop_polling | |
482 | * or by the next inbound run. | |
483 | */ | |
484 | new = add_buf(q->first_to_check, count - 1); | |
485 | if (q->u.in.polling) { | |
486 | /* reset the previous ACK but first set the new one */ | |
487 | set_buf_state(q, new, SLSB_P_INPUT_ACK); | |
e85dea0e | 488 | set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); |
3fdf1e18 | 489 | } else { |
50f769df | 490 | q->u.in.polling = 1; |
3fdf1e18 | 491 | set_buf_state(q, new, SLSB_P_INPUT_ACK); |
50f769df JG |
492 | } |
493 | ||
e85dea0e | 494 | q->u.in.ack_start = new; |
50f769df JG |
495 | count--; |
496 | if (!count) | |
497 | return; | |
6541f7b6 JG |
498 | /* need to change ALL buffers to get more interrupts */ |
499 | set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count); | |
779e6e1c JG |
500 | } |
501 | ||
502 | static int get_inbound_buffer_frontier(struct qdio_q *q) | |
503 | { | |
504 | int count, stop; | |
6fa1098a | 505 | unsigned char state = 0; |
779e6e1c | 506 | |
8c071b0f | 507 | q->timestamp = get_tod_clock_fast(); |
a2b86019 | 508 | |
779e6e1c JG |
509 | /* |
510 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved | |
511 | * would return 0. | |
512 | */ | |
513 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); | |
514 | stop = add_buf(q->first_to_check, count); | |
515 | ||
779e6e1c JG |
516 | if (q->first_to_check == stop) |
517 | goto out; | |
518 | ||
36e3e721 JG |
519 | /* |
520 | * No siga sync here, as a PCI or we after a thin interrupt | |
521 | * already sync'ed the queues. | |
522 | */ | |
104ea556 | 523 | count = get_buf_states(q, q->first_to_check, &state, count, 1, 0); |
779e6e1c JG |
524 | if (!count) |
525 | goto out; | |
526 | ||
527 | switch (state) { | |
528 | case SLSB_P_INPUT_PRIMED: | |
50f769df | 529 | inbound_primed(q, count); |
779e6e1c | 530 | q->first_to_check = add_buf(q->first_to_check, count); |
8bcd9b04 | 531 | if (atomic_sub(count, &q->nr_buf_used) == 0) |
6486cda6 | 532 | qperf_inc(q, inbound_queue_full); |
d307297f JG |
533 | if (q->irq_ptr->perf_stat_enabled) |
534 | account_sbals(q, count); | |
36e3e721 | 535 | break; |
779e6e1c | 536 | case SLSB_P_INPUT_ERROR: |
bffbbd2d | 537 | process_buffer_error(q, count); |
779e6e1c JG |
538 | q->first_to_check = add_buf(q->first_to_check, count); |
539 | atomic_sub(count, &q->nr_buf_used); | |
d307297f JG |
540 | if (q->irq_ptr->perf_stat_enabled) |
541 | account_sbals_error(q, count); | |
779e6e1c JG |
542 | break; |
543 | case SLSB_CU_INPUT_EMPTY: | |
544 | case SLSB_P_INPUT_NOT_INIT: | |
545 | case SLSB_P_INPUT_ACK: | |
d307297f JG |
546 | if (q->irq_ptr->perf_stat_enabled) |
547 | q->q_stats.nr_sbal_nop++; | |
22f99347 | 548 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop"); |
779e6e1c JG |
549 | break; |
550 | default: | |
ce1d8014 | 551 | WARN_ON_ONCE(1); |
779e6e1c JG |
552 | } |
553 | out: | |
779e6e1c JG |
554 | return q->first_to_check; |
555 | } | |
556 | ||
60b5df2f | 557 | static int qdio_inbound_q_moved(struct qdio_q *q) |
779e6e1c JG |
558 | { |
559 | int bufnr; | |
560 | ||
561 | bufnr = get_inbound_buffer_frontier(q); | |
562 | ||
1549d13f | 563 | if (bufnr != q->last_move) { |
e85dea0e | 564 | q->last_move = bufnr; |
27d71602 | 565 | if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR) |
1aae0560 | 566 | q->u.in.timestamp = get_tod_clock(); |
779e6e1c JG |
567 | return 1; |
568 | } else | |
569 | return 0; | |
570 | } | |
571 | ||
9a2c160a | 572 | static inline int qdio_inbound_q_done(struct qdio_q *q) |
779e6e1c | 573 | { |
9a1ce28a | 574 | unsigned char state = 0; |
779e6e1c JG |
575 | |
576 | if (!atomic_read(&q->nr_buf_used)) | |
577 | return 1; | |
578 | ||
90adac58 JG |
579 | if (need_siga_sync(q)) |
580 | qdio_siga_sync_q(q); | |
50f769df | 581 | get_buf_state(q, q->first_to_check, &state, 0); |
9a2c160a | 582 | |
4c52228d | 583 | if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR) |
9a2c160a | 584 | /* more work coming */ |
779e6e1c JG |
585 | return 0; |
586 | ||
9a2c160a JG |
587 | if (is_thinint_irq(q->irq_ptr)) |
588 | return 1; | |
589 | ||
590 | /* don't poll under z/VM */ | |
591 | if (MACHINE_IS_VM) | |
779e6e1c JG |
592 | return 1; |
593 | ||
594 | /* | |
595 | * At this point we know, that inbound first_to_check | |
596 | * has (probably) not moved (see qdio_inbound_processing). | |
597 | */ | |
8c071b0f | 598 | if (get_tod_clock_fast() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) { |
1d7e1500 | 599 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x", |
22f99347 | 600 | q->first_to_check); |
779e6e1c | 601 | return 1; |
9a2c160a | 602 | } else |
60b5df2f | 603 | return 0; |
60b5df2f JG |
604 | } |
605 | ||
104ea556 | 606 | static inline int contains_aobs(struct qdio_q *q) |
607 | { | |
608 | return !q->is_input_q && q->u.out.use_cq; | |
609 | } | |
610 | ||
104ea556 | 611 | static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count) |
612 | { | |
613 | unsigned char state = 0; | |
614 | int j, b = start; | |
615 | ||
616 | if (!contains_aobs(q)) | |
617 | return; | |
618 | ||
619 | for (j = 0; j < count; ++j) { | |
620 | get_buf_state(q, b, &state, 0); | |
621 | if (state == SLSB_P_OUTPUT_PENDING) { | |
622 | struct qaob *aob = q->u.out.aobs[b]; | |
623 | if (aob == NULL) | |
624 | continue; | |
625 | ||
104ea556 | 626 | q->u.out.sbal_state[b].flags |= |
627 | QDIO_OUTBUF_STATE_FLAG_PENDING; | |
628 | q->u.out.aobs[b] = NULL; | |
629 | } else if (state == SLSB_P_OUTPUT_EMPTY) { | |
104ea556 | 630 | q->u.out.sbal_state[b].aob = NULL; |
631 | } | |
632 | b = next_buf(b); | |
633 | } | |
634 | } | |
635 | ||
636 | static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q, | |
637 | int bufnr) | |
638 | { | |
639 | unsigned long phys_aob = 0; | |
640 | ||
641 | if (!q->use_cq) | |
642 | goto out; | |
643 | ||
644 | if (!q->aobs[bufnr]) { | |
645 | struct qaob *aob = qdio_allocate_aob(); | |
646 | q->aobs[bufnr] = aob; | |
647 | } | |
648 | if (q->aobs[bufnr]) { | |
104ea556 | 649 | q->sbal_state[bufnr].flags = QDIO_OUTBUF_STATE_FLAG_NONE; |
650 | q->sbal_state[bufnr].aob = q->aobs[bufnr]; | |
651 | q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user; | |
652 | phys_aob = virt_to_phys(q->aobs[bufnr]); | |
ce1d8014 | 653 | WARN_ON_ONCE(phys_aob & 0xFF); |
104ea556 | 654 | } |
655 | ||
656 | out: | |
657 | return phys_aob; | |
658 | } | |
659 | ||
60b5df2f | 660 | static void qdio_kick_handler(struct qdio_q *q) |
779e6e1c | 661 | { |
9c8a08d7 JG |
662 | int start = q->first_to_kick; |
663 | int end = q->first_to_check; | |
664 | int count; | |
779e6e1c JG |
665 | |
666 | if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) | |
667 | return; | |
668 | ||
9c8a08d7 JG |
669 | count = sub_buf(end, start); |
670 | ||
671 | if (q->is_input_q) { | |
6486cda6 | 672 | qperf_inc(q, inbound_handler); |
1d7e1500 | 673 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count); |
bd6e8a16 | 674 | } else { |
6486cda6 | 675 | qperf_inc(q, outbound_handler); |
1d7e1500 JG |
676 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x", |
677 | start, count); | |
bd6e8a16 | 678 | } |
9c8a08d7 | 679 | |
104ea556 | 680 | qdio_handle_aobs(q, start, count); |
681 | ||
9c8a08d7 JG |
682 | q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count, |
683 | q->irq_ptr->int_parm); | |
779e6e1c JG |
684 | |
685 | /* for the next time */ | |
9c8a08d7 | 686 | q->first_to_kick = end; |
779e6e1c JG |
687 | q->qdio_error = 0; |
688 | } | |
689 | ||
690 | static void __qdio_inbound_processing(struct qdio_q *q) | |
691 | { | |
6486cda6 | 692 | qperf_inc(q, tasklet_inbound); |
f3eb20fa | 693 | |
779e6e1c JG |
694 | if (!qdio_inbound_q_moved(q)) |
695 | return; | |
696 | ||
9c8a08d7 | 697 | qdio_kick_handler(q); |
779e6e1c | 698 | |
6486cda6 | 699 | if (!qdio_inbound_q_done(q)) { |
779e6e1c | 700 | /* means poll time is not yet over */ |
6486cda6 | 701 | qperf_inc(q, tasklet_inbound_resched); |
f3eb20fa JG |
702 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) { |
703 | tasklet_schedule(&q->tasklet); | |
704 | return; | |
705 | } | |
6486cda6 | 706 | } |
779e6e1c JG |
707 | |
708 | qdio_stop_polling(q); | |
709 | /* | |
710 | * We need to check again to not lose initiative after | |
711 | * resetting the ACK state. | |
712 | */ | |
6486cda6 JG |
713 | if (!qdio_inbound_q_done(q)) { |
714 | qperf_inc(q, tasklet_inbound_resched2); | |
f3eb20fa JG |
715 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) |
716 | tasklet_schedule(&q->tasklet); | |
6486cda6 | 717 | } |
779e6e1c JG |
718 | } |
719 | ||
779e6e1c JG |
720 | void qdio_inbound_processing(unsigned long data) |
721 | { | |
722 | struct qdio_q *q = (struct qdio_q *)data; | |
723 | __qdio_inbound_processing(q); | |
724 | } | |
725 | ||
726 | static int get_outbound_buffer_frontier(struct qdio_q *q) | |
727 | { | |
728 | int count, stop; | |
6fa1098a | 729 | unsigned char state = 0; |
779e6e1c | 730 | |
8c071b0f | 731 | q->timestamp = get_tod_clock_fast(); |
a2b86019 | 732 | |
90adac58 JG |
733 | if (need_siga_sync(q)) |
734 | if (((queue_type(q) != QDIO_IQDIO_QFMT) && | |
735 | !pci_out_supported(q)) || | |
736 | (queue_type(q) == QDIO_IQDIO_QFMT && | |
737 | multicast_outbound(q))) | |
738 | qdio_siga_sync_q(q); | |
779e6e1c JG |
739 | |
740 | /* | |
741 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved | |
742 | * would return 0. | |
743 | */ | |
744 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); | |
745 | stop = add_buf(q->first_to_check, count); | |
779e6e1c | 746 | if (q->first_to_check == stop) |
104ea556 | 747 | goto out; |
779e6e1c | 748 | |
104ea556 | 749 | count = get_buf_states(q, q->first_to_check, &state, count, 0, 1); |
779e6e1c | 750 | if (!count) |
104ea556 | 751 | goto out; |
779e6e1c JG |
752 | |
753 | switch (state) { | |
754 | case SLSB_P_OUTPUT_EMPTY: | |
755 | /* the adapter got it */ | |
104ea556 | 756 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, |
757 | "out empty:%1d %02x", q->nr, count); | |
779e6e1c JG |
758 | |
759 | atomic_sub(count, &q->nr_buf_used); | |
760 | q->first_to_check = add_buf(q->first_to_check, count); | |
d307297f JG |
761 | if (q->irq_ptr->perf_stat_enabled) |
762 | account_sbals(q, count); | |
104ea556 | 763 | |
36e3e721 | 764 | break; |
779e6e1c | 765 | case SLSB_P_OUTPUT_ERROR: |
bffbbd2d | 766 | process_buffer_error(q, count); |
779e6e1c JG |
767 | q->first_to_check = add_buf(q->first_to_check, count); |
768 | atomic_sub(count, &q->nr_buf_used); | |
d307297f JG |
769 | if (q->irq_ptr->perf_stat_enabled) |
770 | account_sbals_error(q, count); | |
779e6e1c JG |
771 | break; |
772 | case SLSB_CU_OUTPUT_PRIMED: | |
773 | /* the adapter has not fetched the output yet */ | |
d307297f JG |
774 | if (q->irq_ptr->perf_stat_enabled) |
775 | q->q_stats.nr_sbal_nop++; | |
104ea556 | 776 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", |
777 | q->nr); | |
779e6e1c JG |
778 | break; |
779 | case SLSB_P_OUTPUT_NOT_INIT: | |
780 | case SLSB_P_OUTPUT_HALTED: | |
781 | break; | |
782 | default: | |
ce1d8014 | 783 | WARN_ON_ONCE(1); |
779e6e1c | 784 | } |
104ea556 | 785 | |
786 | out: | |
779e6e1c JG |
787 | return q->first_to_check; |
788 | } | |
789 | ||
790 | /* all buffers processed? */ | |
791 | static inline int qdio_outbound_q_done(struct qdio_q *q) | |
792 | { | |
793 | return atomic_read(&q->nr_buf_used) == 0; | |
794 | } | |
795 | ||
796 | static inline int qdio_outbound_q_moved(struct qdio_q *q) | |
797 | { | |
798 | int bufnr; | |
799 | ||
800 | bufnr = get_outbound_buffer_frontier(q); | |
801 | ||
1549d13f | 802 | if (bufnr != q->last_move) { |
e85dea0e | 803 | q->last_move = bufnr; |
22f99347 | 804 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr); |
779e6e1c JG |
805 | return 1; |
806 | } else | |
807 | return 0; | |
808 | } | |
809 | ||
104ea556 | 810 | static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob) |
779e6e1c | 811 | { |
be8d97a5 | 812 | int retries = 0, cc; |
7a0b4cbc | 813 | unsigned int busy_bit; |
779e6e1c JG |
814 | |
815 | if (!need_siga_out(q)) | |
d303b6fd | 816 | return 0; |
779e6e1c | 817 | |
7a0b4cbc | 818 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr); |
be8d97a5 | 819 | retry: |
6486cda6 | 820 | qperf_inc(q, siga_write); |
7a0b4cbc | 821 | |
104ea556 | 822 | cc = qdio_siga_output(q, &busy_bit, aob); |
7a0b4cbc | 823 | switch (cc) { |
779e6e1c | 824 | case 0: |
779e6e1c | 825 | break; |
7a0b4cbc JG |
826 | case 2: |
827 | if (busy_bit) { | |
be8d97a5 JG |
828 | while (++retries < QDIO_BUSY_BIT_RETRIES) { |
829 | mdelay(QDIO_BUSY_BIT_RETRY_DELAY); | |
830 | goto retry; | |
831 | } | |
832 | DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr); | |
1549d13f JG |
833 | cc = -EBUSY; |
834 | } else { | |
d303b6fd | 835 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr); |
1549d13f JG |
836 | cc = -ENOBUFS; |
837 | } | |
7a0b4cbc JG |
838 | break; |
839 | case 1: | |
840 | case 3: | |
841 | DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc); | |
1549d13f | 842 | cc = -EIO; |
7a0b4cbc | 843 | break; |
779e6e1c | 844 | } |
be8d97a5 JG |
845 | if (retries) { |
846 | DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr); | |
847 | DBF_ERROR("count:%u", retries); | |
848 | } | |
d303b6fd | 849 | return cc; |
779e6e1c JG |
850 | } |
851 | ||
779e6e1c JG |
852 | static void __qdio_outbound_processing(struct qdio_q *q) |
853 | { | |
6486cda6 | 854 | qperf_inc(q, tasklet_outbound); |
ce1d8014 | 855 | WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0); |
779e6e1c JG |
856 | |
857 | if (qdio_outbound_q_moved(q)) | |
9c8a08d7 | 858 | qdio_kick_handler(q); |
779e6e1c | 859 | |
c38f9608 | 860 | if (queue_type(q) == QDIO_ZFCP_QFMT) |
779e6e1c | 861 | if (!pci_out_supported(q) && !qdio_outbound_q_done(q)) |
c38f9608 | 862 | goto sched; |
779e6e1c | 863 | |
779e6e1c JG |
864 | if (q->u.out.pci_out_enabled) |
865 | return; | |
866 | ||
867 | /* | |
868 | * Now we know that queue type is either qeth without pci enabled | |
25f269f1 JG |
869 | * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY |
870 | * is noticed and outbound_handler is called after some time. | |
779e6e1c JG |
871 | */ |
872 | if (qdio_outbound_q_done(q)) | |
873 | del_timer(&q->u.out.timer); | |
6486cda6 JG |
874 | else |
875 | if (!timer_pending(&q->u.out.timer)) | |
779e6e1c | 876 | mod_timer(&q->u.out.timer, jiffies + 10 * HZ); |
c38f9608 JG |
877 | return; |
878 | ||
879 | sched: | |
880 | if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) | |
881 | return; | |
882 | tasklet_schedule(&q->tasklet); | |
779e6e1c JG |
883 | } |
884 | ||
885 | /* outbound tasklet */ | |
886 | void qdio_outbound_processing(unsigned long data) | |
887 | { | |
888 | struct qdio_q *q = (struct qdio_q *)data; | |
889 | __qdio_outbound_processing(q); | |
890 | } | |
891 | ||
892 | void qdio_outbound_timer(unsigned long data) | |
893 | { | |
894 | struct qdio_q *q = (struct qdio_q *)data; | |
c38f9608 JG |
895 | |
896 | if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) | |
897 | return; | |
779e6e1c JG |
898 | tasklet_schedule(&q->tasklet); |
899 | } | |
900 | ||
60b5df2f | 901 | static inline void qdio_check_outbound_after_thinint(struct qdio_q *q) |
779e6e1c JG |
902 | { |
903 | struct qdio_q *out; | |
904 | int i; | |
905 | ||
906 | if (!pci_out_supported(q)) | |
907 | return; | |
908 | ||
909 | for_each_output_queue(q->irq_ptr, out, i) | |
910 | if (!qdio_outbound_q_done(out)) | |
911 | tasklet_schedule(&out->tasklet); | |
912 | } | |
913 | ||
60b5df2f JG |
914 | static void __tiqdio_inbound_processing(struct qdio_q *q) |
915 | { | |
6486cda6 | 916 | qperf_inc(q, tasklet_inbound); |
90adac58 JG |
917 | if (need_siga_sync(q) && need_siga_sync_after_ai(q)) |
918 | qdio_sync_queues(q); | |
60b5df2f JG |
919 | |
920 | /* | |
921 | * The interrupt could be caused by a PCI request. Check the | |
922 | * PCI capable outbound queues. | |
923 | */ | |
924 | qdio_check_outbound_after_thinint(q); | |
925 | ||
926 | if (!qdio_inbound_q_moved(q)) | |
927 | return; | |
928 | ||
929 | qdio_kick_handler(q); | |
930 | ||
9a2c160a | 931 | if (!qdio_inbound_q_done(q)) { |
6486cda6 | 932 | qperf_inc(q, tasklet_inbound_resched); |
e2910bcf | 933 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) { |
60b5df2f | 934 | tasklet_schedule(&q->tasklet); |
e2910bcf JG |
935 | return; |
936 | } | |
60b5df2f JG |
937 | } |
938 | ||
939 | qdio_stop_polling(q); | |
940 | /* | |
941 | * We need to check again to not lose initiative after | |
942 | * resetting the ACK state. | |
943 | */ | |
9a2c160a | 944 | if (!qdio_inbound_q_done(q)) { |
6486cda6 | 945 | qperf_inc(q, tasklet_inbound_resched2); |
60b5df2f JG |
946 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) |
947 | tasklet_schedule(&q->tasklet); | |
948 | } | |
949 | } | |
950 | ||
951 | void tiqdio_inbound_processing(unsigned long data) | |
952 | { | |
953 | struct qdio_q *q = (struct qdio_q *)data; | |
954 | __tiqdio_inbound_processing(q); | |
955 | } | |
956 | ||
779e6e1c JG |
957 | static inline void qdio_set_state(struct qdio_irq *irq_ptr, |
958 | enum qdio_irq_states state) | |
959 | { | |
22f99347 | 960 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state); |
779e6e1c JG |
961 | |
962 | irq_ptr->state = state; | |
963 | mb(); | |
964 | } | |
965 | ||
22f99347 | 966 | static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb) |
779e6e1c | 967 | { |
779e6e1c | 968 | if (irb->esw.esw0.erw.cons) { |
22f99347 JG |
969 | DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no); |
970 | DBF_ERROR_HEX(irb, 64); | |
971 | DBF_ERROR_HEX(irb->ecw, 64); | |
779e6e1c JG |
972 | } |
973 | } | |
974 | ||
975 | /* PCI interrupt handler */ | |
976 | static void qdio_int_handler_pci(struct qdio_irq *irq_ptr) | |
977 | { | |
978 | int i; | |
979 | struct qdio_q *q; | |
980 | ||
c38f9608 JG |
981 | if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) |
982 | return; | |
983 | ||
d36deae7 JG |
984 | for_each_input_queue(irq_ptr, q, i) { |
985 | if (q->u.in.queue_start_poll) { | |
986 | /* skip if polling is enabled or already in work */ | |
987 | if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, | |
988 | &q->u.in.queue_irq_state)) { | |
989 | qperf_inc(q, int_discarded); | |
990 | continue; | |
991 | } | |
992 | q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr, | |
993 | q->irq_ptr->int_parm); | |
104ea556 | 994 | } else { |
d36deae7 | 995 | tasklet_schedule(&q->tasklet); |
104ea556 | 996 | } |
d36deae7 | 997 | } |
779e6e1c | 998 | |
90adac58 | 999 | if (!pci_out_supported(q)) |
779e6e1c JG |
1000 | return; |
1001 | ||
1002 | for_each_output_queue(irq_ptr, q, i) { | |
1003 | if (qdio_outbound_q_done(q)) | |
1004 | continue; | |
90adac58 | 1005 | if (need_siga_sync(q) && need_siga_sync_out_after_pci(q)) |
779e6e1c | 1006 | qdio_siga_sync_q(q); |
779e6e1c JG |
1007 | tasklet_schedule(&q->tasklet); |
1008 | } | |
1009 | } | |
1010 | ||
1011 | static void qdio_handle_activate_check(struct ccw_device *cdev, | |
1012 | unsigned long intparm, int cstat, int dstat) | |
1013 | { | |
1014 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1015 | struct qdio_q *q; | |
dfe5bb50 | 1016 | int count; |
779e6e1c | 1017 | |
22f99347 JG |
1018 | DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no); |
1019 | DBF_ERROR("intp :%lx", intparm); | |
1020 | DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); | |
779e6e1c JG |
1021 | |
1022 | if (irq_ptr->nr_input_qs) { | |
1023 | q = irq_ptr->input_qs[0]; | |
1024 | } else if (irq_ptr->nr_output_qs) { | |
1025 | q = irq_ptr->output_qs[0]; | |
1026 | } else { | |
1027 | dump_stack(); | |
1028 | goto no_handler; | |
1029 | } | |
dfe5bb50 SS |
1030 | |
1031 | count = sub_buf(q->first_to_check, q->first_to_kick); | |
1549d13f | 1032 | q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE, |
dfe5bb50 | 1033 | q->nr, q->first_to_kick, count, irq_ptr->int_parm); |
779e6e1c JG |
1034 | no_handler: |
1035 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); | |
3ab121ab MH |
1036 | /* |
1037 | * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen. | |
1038 | * Therefore we call the LGR detection function here. | |
1039 | */ | |
1040 | lgr_info_log(); | |
779e6e1c JG |
1041 | } |
1042 | ||
4c575423 JG |
1043 | static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat, |
1044 | int dstat) | |
779e6e1c JG |
1045 | { |
1046 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1047 | ||
4c575423 | 1048 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq"); |
779e6e1c | 1049 | |
4c575423 | 1050 | if (cstat) |
779e6e1c | 1051 | goto error; |
4c575423 | 1052 | if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END)) |
779e6e1c | 1053 | goto error; |
4c575423 JG |
1054 | if (!(dstat & DEV_STAT_DEV_END)) |
1055 | goto error; | |
1056 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED); | |
1057 | return; | |
1058 | ||
779e6e1c | 1059 | error: |
22f99347 JG |
1060 | DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no); |
1061 | DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); | |
779e6e1c | 1062 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); |
779e6e1c JG |
1063 | } |
1064 | ||
1065 | /* qdio interrupt handler */ | |
1066 | void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm, | |
1067 | struct irb *irb) | |
1068 | { | |
1069 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1070 | int cstat, dstat; | |
779e6e1c | 1071 | |
779e6e1c | 1072 | if (!intparm || !irq_ptr) { |
22f99347 | 1073 | DBF_ERROR("qint:%4x", cdev->private->schid.sch_no); |
779e6e1c JG |
1074 | return; |
1075 | } | |
1076 | ||
09a308f3 JG |
1077 | if (irq_ptr->perf_stat_enabled) |
1078 | irq_ptr->perf_stat.qdio_int++; | |
1079 | ||
779e6e1c | 1080 | if (IS_ERR(irb)) { |
ce1d8014 JG |
1081 | DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no); |
1082 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); | |
1083 | wake_up(&cdev->private->wait_q); | |
1084 | return; | |
779e6e1c | 1085 | } |
22f99347 | 1086 | qdio_irq_check_sense(irq_ptr, irb); |
779e6e1c JG |
1087 | cstat = irb->scsw.cmd.cstat; |
1088 | dstat = irb->scsw.cmd.dstat; | |
1089 | ||
1090 | switch (irq_ptr->state) { | |
1091 | case QDIO_IRQ_STATE_INACTIVE: | |
1092 | qdio_establish_handle_irq(cdev, cstat, dstat); | |
1093 | break; | |
779e6e1c JG |
1094 | case QDIO_IRQ_STATE_CLEANUP: |
1095 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1096 | break; | |
779e6e1c JG |
1097 | case QDIO_IRQ_STATE_ESTABLISHED: |
1098 | case QDIO_IRQ_STATE_ACTIVE: | |
1099 | if (cstat & SCHN_STAT_PCI) { | |
1100 | qdio_int_handler_pci(irq_ptr); | |
779e6e1c JG |
1101 | return; |
1102 | } | |
4c575423 | 1103 | if (cstat || dstat) |
779e6e1c JG |
1104 | qdio_handle_activate_check(cdev, intparm, cstat, |
1105 | dstat); | |
4c575423 | 1106 | break; |
959153d3 JG |
1107 | case QDIO_IRQ_STATE_STOPPED: |
1108 | break; | |
779e6e1c | 1109 | default: |
ce1d8014 | 1110 | WARN_ON_ONCE(1); |
779e6e1c JG |
1111 | } |
1112 | wake_up(&cdev->private->wait_q); | |
1113 | } | |
1114 | ||
1115 | /** | |
1116 | * qdio_get_ssqd_desc - get qdio subchannel description | |
1117 | * @cdev: ccw device to get description for | |
bbd50e17 | 1118 | * @data: where to store the ssqd |
779e6e1c | 1119 | * |
bbd50e17 JG |
1120 | * Returns 0 or an error code. The results of the chsc are stored in the |
1121 | * specified structure. | |
779e6e1c | 1122 | */ |
bbd50e17 JG |
1123 | int qdio_get_ssqd_desc(struct ccw_device *cdev, |
1124 | struct qdio_ssqd_desc *data) | |
779e6e1c | 1125 | { |
779e6e1c | 1126 | |
bbd50e17 JG |
1127 | if (!cdev || !cdev->private) |
1128 | return -EINVAL; | |
1129 | ||
22f99347 | 1130 | DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no); |
bbd50e17 | 1131 | return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data); |
779e6e1c JG |
1132 | } |
1133 | EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc); | |
1134 | ||
779e6e1c JG |
1135 | static void qdio_shutdown_queues(struct ccw_device *cdev) |
1136 | { | |
1137 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1138 | struct qdio_q *q; | |
1139 | int i; | |
1140 | ||
1141 | for_each_input_queue(irq_ptr, q, i) | |
c38f9608 | 1142 | tasklet_kill(&q->tasklet); |
779e6e1c JG |
1143 | |
1144 | for_each_output_queue(irq_ptr, q, i) { | |
779e6e1c | 1145 | del_timer(&q->u.out.timer); |
c38f9608 | 1146 | tasklet_kill(&q->tasklet); |
779e6e1c JG |
1147 | } |
1148 | } | |
1149 | ||
1150 | /** | |
1151 | * qdio_shutdown - shut down a qdio subchannel | |
1152 | * @cdev: associated ccw device | |
1153 | * @how: use halt or clear to shutdown | |
1154 | */ | |
1155 | int qdio_shutdown(struct ccw_device *cdev, int how) | |
1156 | { | |
22f99347 | 1157 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
779e6e1c JG |
1158 | int rc; |
1159 | unsigned long flags; | |
779e6e1c | 1160 | |
779e6e1c JG |
1161 | if (!irq_ptr) |
1162 | return -ENODEV; | |
1163 | ||
ce1d8014 | 1164 | WARN_ON_ONCE(irqs_disabled()); |
22f99347 JG |
1165 | DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no); |
1166 | ||
779e6e1c JG |
1167 | mutex_lock(&irq_ptr->setup_mutex); |
1168 | /* | |
1169 | * Subchannel was already shot down. We cannot prevent being called | |
1170 | * twice since cio may trigger a shutdown asynchronously. | |
1171 | */ | |
1172 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { | |
1173 | mutex_unlock(&irq_ptr->setup_mutex); | |
1174 | return 0; | |
1175 | } | |
1176 | ||
c38f9608 JG |
1177 | /* |
1178 | * Indicate that the device is going down. Scheduling the queue | |
1179 | * tasklets is forbidden from here on. | |
1180 | */ | |
1181 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); | |
1182 | ||
779e6e1c JG |
1183 | tiqdio_remove_input_queues(irq_ptr); |
1184 | qdio_shutdown_queues(cdev); | |
aa2383f8 | 1185 | qdio_shutdown_debug_entries(irq_ptr); |
779e6e1c JG |
1186 | |
1187 | /* cleanup subchannel */ | |
1188 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1189 | ||
1190 | if (how & QDIO_FLAG_CLEANUP_USING_CLEAR) | |
1191 | rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP); | |
1192 | else | |
1193 | /* default behaviour is halt */ | |
1194 | rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP); | |
1195 | if (rc) { | |
22f99347 JG |
1196 | DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no); |
1197 | DBF_ERROR("rc:%4d", rc); | |
779e6e1c JG |
1198 | goto no_cleanup; |
1199 | } | |
1200 | ||
1201 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP); | |
1202 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1203 | wait_event_interruptible_timeout(cdev->private->wait_q, | |
1204 | irq_ptr->state == QDIO_IRQ_STATE_INACTIVE || | |
1205 | irq_ptr->state == QDIO_IRQ_STATE_ERR, | |
1206 | 10 * HZ); | |
1207 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1208 | ||
1209 | no_cleanup: | |
1210 | qdio_shutdown_thinint(irq_ptr); | |
1211 | ||
1212 | /* restore interrupt handler */ | |
1213 | if ((void *)cdev->handler == (void *)qdio_int_handler) | |
1214 | cdev->handler = irq_ptr->orig_handler; | |
1215 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1216 | ||
1217 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1218 | mutex_unlock(&irq_ptr->setup_mutex); | |
779e6e1c JG |
1219 | if (rc) |
1220 | return rc; | |
1221 | return 0; | |
1222 | } | |
1223 | EXPORT_SYMBOL_GPL(qdio_shutdown); | |
1224 | ||
1225 | /** | |
1226 | * qdio_free - free data structures for a qdio subchannel | |
1227 | * @cdev: associated ccw device | |
1228 | */ | |
1229 | int qdio_free(struct ccw_device *cdev) | |
1230 | { | |
22f99347 | 1231 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
58eb27cd | 1232 | |
779e6e1c JG |
1233 | if (!irq_ptr) |
1234 | return -ENODEV; | |
1235 | ||
22f99347 | 1236 | DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no); |
779e6e1c | 1237 | mutex_lock(&irq_ptr->setup_mutex); |
22f99347 JG |
1238 | |
1239 | if (irq_ptr->debug_area != NULL) { | |
1240 | debug_unregister(irq_ptr->debug_area); | |
1241 | irq_ptr->debug_area = NULL; | |
1242 | } | |
779e6e1c JG |
1243 | cdev->private->qdio_data = NULL; |
1244 | mutex_unlock(&irq_ptr->setup_mutex); | |
1245 | ||
1246 | qdio_release_memory(irq_ptr); | |
1247 | return 0; | |
1248 | } | |
1249 | EXPORT_SYMBOL_GPL(qdio_free); | |
1250 | ||
779e6e1c JG |
1251 | /** |
1252 | * qdio_allocate - allocate qdio queues and associated data | |
1253 | * @init_data: initialization data | |
1254 | */ | |
1255 | int qdio_allocate(struct qdio_initialize *init_data) | |
1256 | { | |
1257 | struct qdio_irq *irq_ptr; | |
779e6e1c | 1258 | |
22f99347 | 1259 | DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no); |
779e6e1c JG |
1260 | |
1261 | if ((init_data->no_input_qs && !init_data->input_handler) || | |
1262 | (init_data->no_output_qs && !init_data->output_handler)) | |
1263 | return -EINVAL; | |
1264 | ||
1265 | if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) || | |
1266 | (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)) | |
1267 | return -EINVAL; | |
1268 | ||
1269 | if ((!init_data->input_sbal_addr_array) || | |
1270 | (!init_data->output_sbal_addr_array)) | |
1271 | return -EINVAL; | |
1272 | ||
779e6e1c JG |
1273 | /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */ |
1274 | irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
1275 | if (!irq_ptr) | |
1276 | goto out_err; | |
779e6e1c JG |
1277 | |
1278 | mutex_init(&irq_ptr->setup_mutex); | |
22f99347 | 1279 | qdio_allocate_dbf(init_data, irq_ptr); |
779e6e1c JG |
1280 | |
1281 | /* | |
1282 | * Allocate a page for the chsc calls in qdio_establish. | |
1283 | * Must be pre-allocated since a zfcp recovery will call | |
1284 | * qdio_establish. In case of low memory and swap on a zfcp disk | |
1285 | * we may not be able to allocate memory otherwise. | |
1286 | */ | |
1287 | irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL); | |
1288 | if (!irq_ptr->chsc_page) | |
1289 | goto out_rel; | |
1290 | ||
1291 | /* qdr is used in ccw1.cda which is u32 */ | |
3b8e3004 | 1292 | irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
779e6e1c JG |
1293 | if (!irq_ptr->qdr) |
1294 | goto out_rel; | |
779e6e1c | 1295 | |
779e6e1c JG |
1296 | if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs, |
1297 | init_data->no_output_qs)) | |
1298 | goto out_rel; | |
1299 | ||
1300 | init_data->cdev->private->qdio_data = irq_ptr; | |
1301 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1302 | return 0; | |
1303 | out_rel: | |
1304 | qdio_release_memory(irq_ptr); | |
1305 | out_err: | |
1306 | return -ENOMEM; | |
1307 | } | |
1308 | EXPORT_SYMBOL_GPL(qdio_allocate); | |
1309 | ||
104ea556 | 1310 | static void qdio_detect_hsicq(struct qdio_irq *irq_ptr) |
1311 | { | |
1312 | struct qdio_q *q = irq_ptr->input_qs[0]; | |
1313 | int i, use_cq = 0; | |
1314 | ||
1315 | if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT) | |
1316 | use_cq = 1; | |
1317 | ||
1318 | for_each_output_queue(irq_ptr, q, i) { | |
1319 | if (use_cq) { | |
1320 | if (qdio_enable_async_operation(&q->u.out) < 0) { | |
1321 | use_cq = 0; | |
1322 | continue; | |
1323 | } | |
1324 | } else | |
1325 | qdio_disable_async_operation(&q->u.out); | |
1326 | } | |
1327 | DBF_EVENT("use_cq:%d", use_cq); | |
1328 | } | |
1329 | ||
779e6e1c JG |
1330 | /** |
1331 | * qdio_establish - establish queues on a qdio subchannel | |
1332 | * @init_data: initialization data | |
1333 | */ | |
1334 | int qdio_establish(struct qdio_initialize *init_data) | |
1335 | { | |
779e6e1c JG |
1336 | struct qdio_irq *irq_ptr; |
1337 | struct ccw_device *cdev = init_data->cdev; | |
1338 | unsigned long saveflags; | |
1339 | int rc; | |
1340 | ||
22f99347 | 1341 | DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no); |
58eb27cd | 1342 | |
779e6e1c JG |
1343 | irq_ptr = cdev->private->qdio_data; |
1344 | if (!irq_ptr) | |
1345 | return -ENODEV; | |
1346 | ||
1347 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1348 | return -EINVAL; | |
1349 | ||
779e6e1c JG |
1350 | mutex_lock(&irq_ptr->setup_mutex); |
1351 | qdio_setup_irq(init_data); | |
1352 | ||
1353 | rc = qdio_establish_thinint(irq_ptr); | |
1354 | if (rc) { | |
1355 | mutex_unlock(&irq_ptr->setup_mutex); | |
1356 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1357 | return rc; | |
1358 | } | |
1359 | ||
1360 | /* establish q */ | |
1361 | irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd; | |
1362 | irq_ptr->ccw.flags = CCW_FLAG_SLI; | |
1363 | irq_ptr->ccw.count = irq_ptr->equeue.count; | |
1364 | irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr); | |
1365 | ||
1366 | spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); | |
1367 | ccw_device_set_options_mask(cdev, 0); | |
1368 | ||
1369 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0); | |
1370 | if (rc) { | |
22f99347 JG |
1371 | DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no); |
1372 | DBF_ERROR("rc:%4x", rc); | |
779e6e1c JG |
1373 | } |
1374 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); | |
1375 | ||
1376 | if (rc) { | |
1377 | mutex_unlock(&irq_ptr->setup_mutex); | |
1378 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1379 | return rc; | |
1380 | } | |
1381 | ||
1382 | wait_event_interruptible_timeout(cdev->private->wait_q, | |
1383 | irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED || | |
1384 | irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ); | |
1385 | ||
1386 | if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) { | |
1387 | mutex_unlock(&irq_ptr->setup_mutex); | |
1388 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1389 | return -EIO; | |
1390 | } | |
1391 | ||
1392 | qdio_setup_ssqd_info(irq_ptr); | |
779e6e1c | 1393 | |
104ea556 | 1394 | qdio_detect_hsicq(irq_ptr); |
1395 | ||
779e6e1c JG |
1396 | /* qebsm is now setup if available, initialize buffer states */ |
1397 | qdio_init_buf_states(irq_ptr); | |
1398 | ||
1399 | mutex_unlock(&irq_ptr->setup_mutex); | |
1400 | qdio_print_subchannel_info(irq_ptr, cdev); | |
1401 | qdio_setup_debug_entries(irq_ptr, cdev); | |
1402 | return 0; | |
1403 | } | |
1404 | EXPORT_SYMBOL_GPL(qdio_establish); | |
1405 | ||
1406 | /** | |
1407 | * qdio_activate - activate queues on a qdio subchannel | |
1408 | * @cdev: associated cdev | |
1409 | */ | |
1410 | int qdio_activate(struct ccw_device *cdev) | |
1411 | { | |
1412 | struct qdio_irq *irq_ptr; | |
1413 | int rc; | |
1414 | unsigned long saveflags; | |
779e6e1c | 1415 | |
22f99347 | 1416 | DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no); |
58eb27cd | 1417 | |
779e6e1c JG |
1418 | irq_ptr = cdev->private->qdio_data; |
1419 | if (!irq_ptr) | |
1420 | return -ENODEV; | |
1421 | ||
1422 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1423 | return -EINVAL; | |
1424 | ||
1425 | mutex_lock(&irq_ptr->setup_mutex); | |
1426 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { | |
1427 | rc = -EBUSY; | |
1428 | goto out; | |
1429 | } | |
1430 | ||
779e6e1c JG |
1431 | irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd; |
1432 | irq_ptr->ccw.flags = CCW_FLAG_SLI; | |
1433 | irq_ptr->ccw.count = irq_ptr->aqueue.count; | |
1434 | irq_ptr->ccw.cda = 0; | |
1435 | ||
1436 | spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); | |
1437 | ccw_device_set_options(cdev, CCWDEV_REPORT_ALL); | |
1438 | ||
1439 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE, | |
1440 | 0, DOIO_DENY_PREFETCH); | |
1441 | if (rc) { | |
22f99347 JG |
1442 | DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no); |
1443 | DBF_ERROR("rc:%4x", rc); | |
779e6e1c JG |
1444 | } |
1445 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); | |
1446 | ||
1447 | if (rc) | |
1448 | goto out; | |
1449 | ||
1450 | if (is_thinint_irq(irq_ptr)) | |
1451 | tiqdio_add_input_queues(irq_ptr); | |
1452 | ||
1453 | /* wait for subchannel to become active */ | |
1454 | msleep(5); | |
1455 | ||
1456 | switch (irq_ptr->state) { | |
1457 | case QDIO_IRQ_STATE_STOPPED: | |
1458 | case QDIO_IRQ_STATE_ERR: | |
e4c14e20 JG |
1459 | rc = -EIO; |
1460 | break; | |
779e6e1c JG |
1461 | default: |
1462 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE); | |
1463 | rc = 0; | |
1464 | } | |
1465 | out: | |
1466 | mutex_unlock(&irq_ptr->setup_mutex); | |
1467 | return rc; | |
1468 | } | |
1469 | EXPORT_SYMBOL_GPL(qdio_activate); | |
1470 | ||
1471 | static inline int buf_in_between(int bufnr, int start, int count) | |
1472 | { | |
1473 | int end = add_buf(start, count); | |
1474 | ||
1475 | if (end > start) { | |
1476 | if (bufnr >= start && bufnr < end) | |
1477 | return 1; | |
1478 | else | |
1479 | return 0; | |
1480 | } | |
1481 | ||
1482 | /* wrap-around case */ | |
1483 | if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) || | |
1484 | (bufnr < end)) | |
1485 | return 1; | |
1486 | else | |
1487 | return 0; | |
1488 | } | |
1489 | ||
1490 | /** | |
1491 | * handle_inbound - reset processed input buffers | |
1492 | * @q: queue containing the buffers | |
1493 | * @callflags: flags | |
1494 | * @bufnr: first buffer to process | |
1495 | * @count: how many buffers are emptied | |
1496 | */ | |
d303b6fd JG |
1497 | static int handle_inbound(struct qdio_q *q, unsigned int callflags, |
1498 | int bufnr, int count) | |
779e6e1c | 1499 | { |
dae7fd42 | 1500 | int diff; |
779e6e1c | 1501 | |
6486cda6 JG |
1502 | qperf_inc(q, inbound_call); |
1503 | ||
50f769df JG |
1504 | if (!q->u.in.polling) |
1505 | goto set; | |
1506 | ||
1507 | /* protect against stop polling setting an ACK for an emptied slsb */ | |
1508 | if (count == QDIO_MAX_BUFFERS_PER_Q) { | |
1509 | /* overwriting everything, just delete polling status */ | |
1510 | q->u.in.polling = 0; | |
1511 | q->u.in.ack_count = 0; | |
1512 | goto set; | |
e85dea0e | 1513 | } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) { |
50f769df | 1514 | if (is_qebsm(q)) { |
e85dea0e | 1515 | /* partial overwrite, just update ack_start */ |
50f769df | 1516 | diff = add_buf(bufnr, count); |
e85dea0e | 1517 | diff = sub_buf(diff, q->u.in.ack_start); |
50f769df JG |
1518 | q->u.in.ack_count -= diff; |
1519 | if (q->u.in.ack_count <= 0) { | |
1520 | q->u.in.polling = 0; | |
1521 | q->u.in.ack_count = 0; | |
50f769df JG |
1522 | goto set; |
1523 | } | |
e85dea0e | 1524 | q->u.in.ack_start = add_buf(q->u.in.ack_start, diff); |
50f769df JG |
1525 | } |
1526 | else | |
1527 | /* the only ACK will be deleted, so stop polling */ | |
779e6e1c | 1528 | q->u.in.polling = 0; |
50f769df | 1529 | } |
779e6e1c | 1530 | |
50f769df | 1531 | set: |
779e6e1c | 1532 | count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count); |
dae7fd42 | 1533 | atomic_add(count, &q->nr_buf_used); |
779e6e1c | 1534 | |
d303b6fd JG |
1535 | if (need_siga_in(q)) |
1536 | return qdio_siga_input(q); | |
9cb7284f | 1537 | |
d303b6fd | 1538 | return 0; |
779e6e1c JG |
1539 | } |
1540 | ||
1541 | /** | |
1542 | * handle_outbound - process filled outbound buffers | |
1543 | * @q: queue containing the buffers | |
1544 | * @callflags: flags | |
1545 | * @bufnr: first buffer to process | |
1546 | * @count: how many buffers are filled | |
1547 | */ | |
d303b6fd JG |
1548 | static int handle_outbound(struct qdio_q *q, unsigned int callflags, |
1549 | int bufnr, int count) | |
779e6e1c | 1550 | { |
c26001d4 | 1551 | unsigned char state = 0; |
d303b6fd | 1552 | int used, rc = 0; |
779e6e1c | 1553 | |
6486cda6 | 1554 | qperf_inc(q, outbound_call); |
779e6e1c JG |
1555 | |
1556 | count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count); | |
1557 | used = atomic_add_return(count, &q->nr_buf_used); | |
779e6e1c | 1558 | |
0195843b JG |
1559 | if (used == QDIO_MAX_BUFFERS_PER_Q) |
1560 | qperf_inc(q, outbound_queue_full); | |
1561 | ||
6486cda6 | 1562 | if (callflags & QDIO_FLAG_PCI_OUT) { |
779e6e1c | 1563 | q->u.out.pci_out_enabled = 1; |
6486cda6 | 1564 | qperf_inc(q, pci_request_int); |
110da317 | 1565 | } else |
779e6e1c JG |
1566 | q->u.out.pci_out_enabled = 0; |
1567 | ||
1568 | if (queue_type(q) == QDIO_IQDIO_QFMT) { | |
104ea556 | 1569 | unsigned long phys_aob = 0; |
1570 | ||
1571 | /* One SIGA-W per buffer required for unicast HSI */ | |
110da317 JG |
1572 | WARN_ON_ONCE(count > 1 && !multicast_outbound(q)); |
1573 | ||
104ea556 | 1574 | phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr); |
1575 | ||
1576 | rc = qdio_kick_outbound_q(q, phys_aob); | |
90adac58 | 1577 | } else if (need_siga_sync(q)) { |
110da317 JG |
1578 | rc = qdio_siga_sync_q(q); |
1579 | } else { | |
1580 | /* try to fast requeue buffers */ | |
1581 | get_buf_state(q, prev_buf(bufnr), &state, 0); | |
1582 | if (state != SLSB_CU_OUTPUT_PRIMED) | |
104ea556 | 1583 | rc = qdio_kick_outbound_q(q, 0); |
779e6e1c | 1584 | else |
110da317 | 1585 | qperf_inc(q, fast_requeue); |
779e6e1c JG |
1586 | } |
1587 | ||
3d6c76ff JG |
1588 | /* in case of SIGA errors we must process the error immediately */ |
1589 | if (used >= q->u.out.scan_threshold || rc) | |
1590 | tasklet_schedule(&q->tasklet); | |
1591 | else | |
1592 | /* free the SBALs in case of no further traffic */ | |
1593 | if (!timer_pending(&q->u.out.timer)) | |
1594 | mod_timer(&q->u.out.timer, jiffies + HZ); | |
d303b6fd | 1595 | return rc; |
779e6e1c JG |
1596 | } |
1597 | ||
1598 | /** | |
1599 | * do_QDIO - process input or output buffers | |
1600 | * @cdev: associated ccw_device for the qdio subchannel | |
1601 | * @callflags: input or output and special flags from the program | |
1602 | * @q_nr: queue number | |
1603 | * @bufnr: buffer number | |
1604 | * @count: how many buffers to process | |
1605 | */ | |
1606 | int do_QDIO(struct ccw_device *cdev, unsigned int callflags, | |
6618241b | 1607 | int q_nr, unsigned int bufnr, unsigned int count) |
779e6e1c JG |
1608 | { |
1609 | struct qdio_irq *irq_ptr; | |
779e6e1c | 1610 | |
6618241b | 1611 | if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q) |
779e6e1c JG |
1612 | return -EINVAL; |
1613 | ||
779e6e1c JG |
1614 | irq_ptr = cdev->private->qdio_data; |
1615 | if (!irq_ptr) | |
1616 | return -ENODEV; | |
1617 | ||
1d7e1500 JG |
1618 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, |
1619 | "do%02x b:%02x c:%02x", callflags, bufnr, count); | |
779e6e1c JG |
1620 | |
1621 | if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE) | |
1549d13f | 1622 | return -EIO; |
9a26513e JG |
1623 | if (!count) |
1624 | return 0; | |
779e6e1c | 1625 | if (callflags & QDIO_FLAG_SYNC_INPUT) |
d303b6fd JG |
1626 | return handle_inbound(irq_ptr->input_qs[q_nr], |
1627 | callflags, bufnr, count); | |
779e6e1c | 1628 | else if (callflags & QDIO_FLAG_SYNC_OUTPUT) |
d303b6fd JG |
1629 | return handle_outbound(irq_ptr->output_qs[q_nr], |
1630 | callflags, bufnr, count); | |
1631 | return -EINVAL; | |
779e6e1c JG |
1632 | } |
1633 | EXPORT_SYMBOL_GPL(do_QDIO); | |
1634 | ||
d36deae7 JG |
1635 | /** |
1636 | * qdio_start_irq - process input buffers | |
1637 | * @cdev: associated ccw_device for the qdio subchannel | |
1638 | * @nr: input queue number | |
1639 | * | |
1640 | * Return codes | |
1641 | * 0 - success | |
1642 | * 1 - irqs not started since new data is available | |
1643 | */ | |
1644 | int qdio_start_irq(struct ccw_device *cdev, int nr) | |
1645 | { | |
1646 | struct qdio_q *q; | |
1647 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1648 | ||
1649 | if (!irq_ptr) | |
1650 | return -ENODEV; | |
1651 | q = irq_ptr->input_qs[nr]; | |
1652 | ||
5f4026f8 | 1653 | clear_nonshared_ind(irq_ptr); |
d36deae7 JG |
1654 | qdio_stop_polling(q); |
1655 | clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state); | |
1656 | ||
1657 | /* | |
1658 | * We need to check again to not lose initiative after | |
1659 | * resetting the ACK state. | |
1660 | */ | |
5f4026f8 | 1661 | if (test_nonshared_ind(irq_ptr)) |
d36deae7 JG |
1662 | goto rescan; |
1663 | if (!qdio_inbound_q_done(q)) | |
1664 | goto rescan; | |
1665 | return 0; | |
1666 | ||
1667 | rescan: | |
1668 | if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, | |
1669 | &q->u.in.queue_irq_state)) | |
1670 | return 0; | |
1671 | else | |
1672 | return 1; | |
1673 | ||
1674 | } | |
1675 | EXPORT_SYMBOL(qdio_start_irq); | |
1676 | ||
1677 | /** | |
1678 | * qdio_get_next_buffers - process input buffers | |
1679 | * @cdev: associated ccw_device for the qdio subchannel | |
1680 | * @nr: input queue number | |
1681 | * @bufnr: first filled buffer number | |
1682 | * @error: buffers are in error state | |
1683 | * | |
1684 | * Return codes | |
1685 | * < 0 - error | |
1686 | * = 0 - no new buffers found | |
1687 | * > 0 - number of processed buffers | |
1688 | */ | |
1689 | int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr, | |
1690 | int *error) | |
1691 | { | |
1692 | struct qdio_q *q; | |
1693 | int start, end; | |
1694 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1695 | ||
1696 | if (!irq_ptr) | |
1697 | return -ENODEV; | |
1698 | q = irq_ptr->input_qs[nr]; | |
d36deae7 | 1699 | |
d36deae7 | 1700 | /* |
90adac58 JG |
1701 | * Cannot rely on automatic sync after interrupt since queues may |
1702 | * also be examined without interrupt. | |
d36deae7 | 1703 | */ |
90adac58 JG |
1704 | if (need_siga_sync(q)) |
1705 | qdio_sync_queues(q); | |
1706 | ||
1707 | /* check the PCI capable outbound queues. */ | |
d36deae7 JG |
1708 | qdio_check_outbound_after_thinint(q); |
1709 | ||
1710 | if (!qdio_inbound_q_moved(q)) | |
1711 | return 0; | |
1712 | ||
1713 | /* Note: upper-layer MUST stop processing immediately here ... */ | |
1714 | if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) | |
1715 | return -EIO; | |
1716 | ||
1717 | start = q->first_to_kick; | |
1718 | end = q->first_to_check; | |
1719 | *bufnr = start; | |
1720 | *error = q->qdio_error; | |
1721 | ||
1722 | /* for the next time */ | |
1723 | q->first_to_kick = end; | |
1724 | q->qdio_error = 0; | |
1725 | return sub_buf(end, start); | |
1726 | } | |
1727 | EXPORT_SYMBOL(qdio_get_next_buffers); | |
1728 | ||
1729 | /** | |
1730 | * qdio_stop_irq - disable interrupt processing for the device | |
1731 | * @cdev: associated ccw_device for the qdio subchannel | |
1732 | * @nr: input queue number | |
1733 | * | |
1734 | * Return codes | |
1735 | * 0 - interrupts were already disabled | |
1736 | * 1 - interrupts successfully disabled | |
1737 | */ | |
1738 | int qdio_stop_irq(struct ccw_device *cdev, int nr) | |
1739 | { | |
1740 | struct qdio_q *q; | |
1741 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1742 | ||
1743 | if (!irq_ptr) | |
1744 | return -ENODEV; | |
1745 | q = irq_ptr->input_qs[nr]; | |
1746 | ||
1747 | if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, | |
1748 | &q->u.in.queue_irq_state)) | |
1749 | return 0; | |
1750 | else | |
1751 | return 1; | |
1752 | } | |
1753 | EXPORT_SYMBOL(qdio_stop_irq); | |
1754 | ||
779e6e1c JG |
1755 | static int __init init_QDIO(void) |
1756 | { | |
1757 | int rc; | |
1758 | ||
aa5c8df3 | 1759 | rc = qdio_debug_init(); |
779e6e1c JG |
1760 | if (rc) |
1761 | return rc; | |
aa5c8df3 SO |
1762 | rc = qdio_setup_init(); |
1763 | if (rc) | |
1764 | goto out_debug; | |
779e6e1c JG |
1765 | rc = tiqdio_allocate_memory(); |
1766 | if (rc) | |
1767 | goto out_cache; | |
779e6e1c JG |
1768 | rc = tiqdio_register_thinints(); |
1769 | if (rc) | |
aa5c8df3 | 1770 | goto out_ti; |
779e6e1c JG |
1771 | return 0; |
1772 | ||
779e6e1c JG |
1773 | out_ti: |
1774 | tiqdio_free_memory(); | |
1775 | out_cache: | |
1776 | qdio_setup_exit(); | |
aa5c8df3 SO |
1777 | out_debug: |
1778 | qdio_debug_exit(); | |
779e6e1c JG |
1779 | return rc; |
1780 | } | |
1781 | ||
1782 | static void __exit exit_QDIO(void) | |
1783 | { | |
1784 | tiqdio_unregister_thinints(); | |
1785 | tiqdio_free_memory(); | |
779e6e1c | 1786 | qdio_setup_exit(); |
aa5c8df3 | 1787 | qdio_debug_exit(); |
779e6e1c JG |
1788 | } |
1789 | ||
1790 | module_init(init_QDIO); | |
1791 | module_exit(exit_QDIO); |