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Commit | Line | Data |
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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 | ||
ec6674c6 EC |
322 | WARN_ON_ONCE(aob && ((queue_type(q) != QDIO_IQDIO_QFMT) || |
323 | !q->u.out.use_cq)); | |
104ea556 | 324 | if (q->u.out.use_cq && aob != 0) { |
325 | fc = QDIO_SIGA_WRITEQ; | |
326 | laob = aob; | |
327 | } | |
779e6e1c | 328 | |
7a0b4cbc | 329 | if (is_qebsm(q)) { |
779e6e1c | 330 | schid = q->irq_ptr->sch_token; |
958c0ba4 | 331 | fc |= QDIO_SIGA_QEBSM_FLAG; |
779e6e1c | 332 | } |
779e6e1c | 333 | again: |
104ea556 | 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 | ||
92bdae5d | 412 | static inline void account_sbals(struct qdio_q *q, unsigned int count) |
d307297f | 413 | { |
92bdae5d | 414 | int pos; |
d307297f JG |
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 | } | |
92bdae5d | 421 | pos = ilog2(count); |
d307297f JG |
422 | q->q_stats.nr_sbals[pos]++; |
423 | } | |
424 | ||
bffbbd2d | 425 | static void process_buffer_error(struct qdio_q *q, int count) |
779e6e1c | 426 | { |
bffbbd2d JG |
427 | unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT : |
428 | SLSB_P_OUTPUT_NOT_INIT; | |
429 | ||
1549d13f | 430 | q->qdio_error = QDIO_ERROR_SLSB_STATE; |
50f769df JG |
431 | |
432 | /* special handling for no target buffer empty */ | |
433 | if ((!q->is_input_q && | |
3ec90878 | 434 | (q->sbal[q->first_to_check]->element[15].sflags) == 0x10)) { |
6486cda6 | 435 | qperf_inc(q, target_full); |
1d7e1500 | 436 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", |
50f769df | 437 | q->first_to_check); |
2768b2de | 438 | goto set; |
50f769df JG |
439 | } |
440 | ||
22f99347 JG |
441 | DBF_ERROR("%4x BUF ERROR", SCH_NO(q)); |
442 | DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr); | |
50f769df | 443 | DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count); |
22f99347 | 444 | DBF_ERROR("F14:%2x F15:%2x", |
3ec90878 JG |
445 | q->sbal[q->first_to_check]->element[14].sflags, |
446 | q->sbal[q->first_to_check]->element[15].sflags); | |
bffbbd2d | 447 | |
2768b2de | 448 | set: |
bffbbd2d JG |
449 | /* |
450 | * Interrupts may be avoided as long as the error is present | |
451 | * so change the buffer state immediately to avoid starvation. | |
452 | */ | |
453 | set_buf_states(q, q->first_to_check, state, count); | |
50f769df | 454 | } |
779e6e1c | 455 | |
50f769df JG |
456 | static inline void inbound_primed(struct qdio_q *q, int count) |
457 | { | |
458 | int new; | |
459 | ||
1d7e1500 | 460 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count); |
50f769df JG |
461 | |
462 | /* for QEBSM the ACK was already set by EQBS */ | |
463 | if (is_qebsm(q)) { | |
464 | if (!q->u.in.polling) { | |
465 | q->u.in.polling = 1; | |
466 | q->u.in.ack_count = count; | |
e85dea0e | 467 | q->u.in.ack_start = q->first_to_check; |
50f769df JG |
468 | return; |
469 | } | |
470 | ||
471 | /* delete the previous ACK's */ | |
e85dea0e | 472 | set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, |
50f769df JG |
473 | q->u.in.ack_count); |
474 | q->u.in.ack_count = count; | |
e85dea0e | 475 | q->u.in.ack_start = q->first_to_check; |
50f769df JG |
476 | return; |
477 | } | |
478 | ||
479 | /* | |
480 | * ACK the newest buffer. The ACK will be removed in qdio_stop_polling | |
481 | * or by the next inbound run. | |
482 | */ | |
483 | new = add_buf(q->first_to_check, count - 1); | |
484 | if (q->u.in.polling) { | |
485 | /* reset the previous ACK but first set the new one */ | |
486 | set_buf_state(q, new, SLSB_P_INPUT_ACK); | |
e85dea0e | 487 | set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); |
3fdf1e18 | 488 | } else { |
50f769df | 489 | q->u.in.polling = 1; |
3fdf1e18 | 490 | set_buf_state(q, new, SLSB_P_INPUT_ACK); |
50f769df JG |
491 | } |
492 | ||
e85dea0e | 493 | q->u.in.ack_start = new; |
50f769df JG |
494 | count--; |
495 | if (!count) | |
496 | return; | |
6541f7b6 JG |
497 | /* need to change ALL buffers to get more interrupts */ |
498 | set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count); | |
779e6e1c JG |
499 | } |
500 | ||
501 | static int get_inbound_buffer_frontier(struct qdio_q *q) | |
502 | { | |
503 | int count, stop; | |
6fa1098a | 504 | unsigned char state = 0; |
779e6e1c | 505 | |
8c071b0f | 506 | q->timestamp = get_tod_clock_fast(); |
a2b86019 | 507 | |
779e6e1c JG |
508 | /* |
509 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved | |
510 | * would return 0. | |
511 | */ | |
512 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); | |
513 | stop = add_buf(q->first_to_check, count); | |
514 | ||
779e6e1c JG |
515 | if (q->first_to_check == stop) |
516 | goto out; | |
517 | ||
36e3e721 JG |
518 | /* |
519 | * No siga sync here, as a PCI or we after a thin interrupt | |
520 | * already sync'ed the queues. | |
521 | */ | |
104ea556 | 522 | count = get_buf_states(q, q->first_to_check, &state, count, 1, 0); |
779e6e1c JG |
523 | if (!count) |
524 | goto out; | |
525 | ||
526 | switch (state) { | |
527 | case SLSB_P_INPUT_PRIMED: | |
50f769df | 528 | inbound_primed(q, count); |
779e6e1c | 529 | q->first_to_check = add_buf(q->first_to_check, count); |
eddf0d5b | 530 | if (atomic_sub_return(count, &q->nr_buf_used) == 0) |
6486cda6 | 531 | qperf_inc(q, inbound_queue_full); |
d307297f JG |
532 | if (q->irq_ptr->perf_stat_enabled) |
533 | account_sbals(q, count); | |
36e3e721 | 534 | break; |
779e6e1c | 535 | case SLSB_P_INPUT_ERROR: |
bffbbd2d | 536 | process_buffer_error(q, count); |
779e6e1c JG |
537 | q->first_to_check = add_buf(q->first_to_check, count); |
538 | atomic_sub(count, &q->nr_buf_used); | |
d307297f JG |
539 | if (q->irq_ptr->perf_stat_enabled) |
540 | account_sbals_error(q, count); | |
779e6e1c JG |
541 | break; |
542 | case SLSB_CU_INPUT_EMPTY: | |
543 | case SLSB_P_INPUT_NOT_INIT: | |
544 | case SLSB_P_INPUT_ACK: | |
d307297f JG |
545 | if (q->irq_ptr->perf_stat_enabled) |
546 | q->q_stats.nr_sbal_nop++; | |
22f99347 | 547 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop"); |
779e6e1c JG |
548 | break; |
549 | default: | |
ce1d8014 | 550 | WARN_ON_ONCE(1); |
779e6e1c JG |
551 | } |
552 | out: | |
779e6e1c JG |
553 | return q->first_to_check; |
554 | } | |
555 | ||
60b5df2f | 556 | static int qdio_inbound_q_moved(struct qdio_q *q) |
779e6e1c JG |
557 | { |
558 | int bufnr; | |
559 | ||
560 | bufnr = get_inbound_buffer_frontier(q); | |
561 | ||
1549d13f | 562 | if (bufnr != q->last_move) { |
e85dea0e | 563 | q->last_move = bufnr; |
27d71602 | 564 | if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR) |
1aae0560 | 565 | q->u.in.timestamp = get_tod_clock(); |
779e6e1c JG |
566 | return 1; |
567 | } else | |
568 | return 0; | |
569 | } | |
570 | ||
9a2c160a | 571 | static inline int qdio_inbound_q_done(struct qdio_q *q) |
779e6e1c | 572 | { |
9a1ce28a | 573 | unsigned char state = 0; |
779e6e1c JG |
574 | |
575 | if (!atomic_read(&q->nr_buf_used)) | |
576 | return 1; | |
577 | ||
90adac58 JG |
578 | if (need_siga_sync(q)) |
579 | qdio_siga_sync_q(q); | |
50f769df | 580 | get_buf_state(q, q->first_to_check, &state, 0); |
9a2c160a | 581 | |
4c52228d | 582 | if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR) |
9a2c160a | 583 | /* more work coming */ |
779e6e1c JG |
584 | return 0; |
585 | ||
9a2c160a JG |
586 | if (is_thinint_irq(q->irq_ptr)) |
587 | return 1; | |
588 | ||
589 | /* don't poll under z/VM */ | |
590 | if (MACHINE_IS_VM) | |
779e6e1c JG |
591 | return 1; |
592 | ||
593 | /* | |
594 | * At this point we know, that inbound first_to_check | |
595 | * has (probably) not moved (see qdio_inbound_processing). | |
596 | */ | |
8c071b0f | 597 | if (get_tod_clock_fast() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) { |
1d7e1500 | 598 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x", |
22f99347 | 599 | q->first_to_check); |
779e6e1c | 600 | return 1; |
9a2c160a | 601 | } else |
60b5df2f | 602 | return 0; |
60b5df2f JG |
603 | } |
604 | ||
104ea556 | 605 | static inline int contains_aobs(struct qdio_q *q) |
606 | { | |
607 | return !q->is_input_q && q->u.out.use_cq; | |
608 | } | |
609 | ||
104ea556 | 610 | static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count) |
611 | { | |
612 | unsigned char state = 0; | |
613 | int j, b = start; | |
614 | ||
615 | if (!contains_aobs(q)) | |
616 | return; | |
617 | ||
618 | for (j = 0; j < count; ++j) { | |
619 | get_buf_state(q, b, &state, 0); | |
620 | if (state == SLSB_P_OUTPUT_PENDING) { | |
621 | struct qaob *aob = q->u.out.aobs[b]; | |
622 | if (aob == NULL) | |
623 | continue; | |
624 | ||
104ea556 | 625 | q->u.out.sbal_state[b].flags |= |
626 | QDIO_OUTBUF_STATE_FLAG_PENDING; | |
627 | q->u.out.aobs[b] = NULL; | |
628 | } else if (state == SLSB_P_OUTPUT_EMPTY) { | |
104ea556 | 629 | q->u.out.sbal_state[b].aob = NULL; |
630 | } | |
631 | b = next_buf(b); | |
632 | } | |
633 | } | |
634 | ||
635 | static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q, | |
636 | int bufnr) | |
637 | { | |
638 | unsigned long phys_aob = 0; | |
639 | ||
640 | if (!q->use_cq) | |
641 | goto out; | |
642 | ||
643 | if (!q->aobs[bufnr]) { | |
644 | struct qaob *aob = qdio_allocate_aob(); | |
645 | q->aobs[bufnr] = aob; | |
646 | } | |
647 | if (q->aobs[bufnr]) { | |
104ea556 | 648 | q->sbal_state[bufnr].flags = QDIO_OUTBUF_STATE_FLAG_NONE; |
649 | q->sbal_state[bufnr].aob = q->aobs[bufnr]; | |
650 | q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user; | |
651 | phys_aob = virt_to_phys(q->aobs[bufnr]); | |
ce1d8014 | 652 | WARN_ON_ONCE(phys_aob & 0xFF); |
104ea556 | 653 | } |
654 | ||
655 | out: | |
656 | return phys_aob; | |
657 | } | |
658 | ||
60b5df2f | 659 | static void qdio_kick_handler(struct qdio_q *q) |
779e6e1c | 660 | { |
9c8a08d7 JG |
661 | int start = q->first_to_kick; |
662 | int end = q->first_to_check; | |
663 | int count; | |
779e6e1c JG |
664 | |
665 | if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) | |
666 | return; | |
667 | ||
9c8a08d7 JG |
668 | count = sub_buf(end, start); |
669 | ||
670 | if (q->is_input_q) { | |
6486cda6 | 671 | qperf_inc(q, inbound_handler); |
1d7e1500 | 672 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count); |
bd6e8a16 | 673 | } else { |
6486cda6 | 674 | qperf_inc(q, outbound_handler); |
1d7e1500 JG |
675 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x", |
676 | start, count); | |
bd6e8a16 | 677 | } |
9c8a08d7 | 678 | |
104ea556 | 679 | qdio_handle_aobs(q, start, count); |
680 | ||
9c8a08d7 JG |
681 | q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count, |
682 | q->irq_ptr->int_parm); | |
779e6e1c JG |
683 | |
684 | /* for the next time */ | |
9c8a08d7 | 685 | q->first_to_kick = end; |
779e6e1c JG |
686 | q->qdio_error = 0; |
687 | } | |
688 | ||
9bce8b2c UB |
689 | static inline int qdio_tasklet_schedule(struct qdio_q *q) |
690 | { | |
691 | if (likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) { | |
692 | tasklet_schedule(&q->tasklet); | |
693 | return 0; | |
694 | } | |
695 | return -EPERM; | |
696 | } | |
697 | ||
779e6e1c JG |
698 | static void __qdio_inbound_processing(struct qdio_q *q) |
699 | { | |
6486cda6 | 700 | qperf_inc(q, tasklet_inbound); |
f3eb20fa | 701 | |
779e6e1c JG |
702 | if (!qdio_inbound_q_moved(q)) |
703 | return; | |
704 | ||
9c8a08d7 | 705 | qdio_kick_handler(q); |
779e6e1c | 706 | |
6486cda6 | 707 | if (!qdio_inbound_q_done(q)) { |
779e6e1c | 708 | /* means poll time is not yet over */ |
6486cda6 | 709 | qperf_inc(q, tasklet_inbound_resched); |
9bce8b2c | 710 | if (!qdio_tasklet_schedule(q)) |
f3eb20fa | 711 | return; |
6486cda6 | 712 | } |
779e6e1c JG |
713 | |
714 | qdio_stop_polling(q); | |
715 | /* | |
716 | * We need to check again to not lose initiative after | |
717 | * resetting the ACK state. | |
718 | */ | |
6486cda6 JG |
719 | if (!qdio_inbound_q_done(q)) { |
720 | qperf_inc(q, tasklet_inbound_resched2); | |
9bce8b2c | 721 | qdio_tasklet_schedule(q); |
6486cda6 | 722 | } |
779e6e1c JG |
723 | } |
724 | ||
779e6e1c JG |
725 | void qdio_inbound_processing(unsigned long data) |
726 | { | |
727 | struct qdio_q *q = (struct qdio_q *)data; | |
728 | __qdio_inbound_processing(q); | |
729 | } | |
730 | ||
731 | static int get_outbound_buffer_frontier(struct qdio_q *q) | |
732 | { | |
733 | int count, stop; | |
6fa1098a | 734 | unsigned char state = 0; |
779e6e1c | 735 | |
8c071b0f | 736 | q->timestamp = get_tod_clock_fast(); |
a2b86019 | 737 | |
90adac58 JG |
738 | if (need_siga_sync(q)) |
739 | if (((queue_type(q) != QDIO_IQDIO_QFMT) && | |
740 | !pci_out_supported(q)) || | |
741 | (queue_type(q) == QDIO_IQDIO_QFMT && | |
742 | multicast_outbound(q))) | |
743 | qdio_siga_sync_q(q); | |
779e6e1c JG |
744 | |
745 | /* | |
746 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved | |
747 | * would return 0. | |
748 | */ | |
749 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); | |
750 | stop = add_buf(q->first_to_check, count); | |
779e6e1c | 751 | if (q->first_to_check == stop) |
104ea556 | 752 | goto out; |
779e6e1c | 753 | |
104ea556 | 754 | count = get_buf_states(q, q->first_to_check, &state, count, 0, 1); |
779e6e1c | 755 | if (!count) |
104ea556 | 756 | goto out; |
779e6e1c JG |
757 | |
758 | switch (state) { | |
759 | case SLSB_P_OUTPUT_EMPTY: | |
760 | /* the adapter got it */ | |
104ea556 | 761 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, |
762 | "out empty:%1d %02x", q->nr, count); | |
779e6e1c JG |
763 | |
764 | atomic_sub(count, &q->nr_buf_used); | |
765 | q->first_to_check = add_buf(q->first_to_check, count); | |
d307297f JG |
766 | if (q->irq_ptr->perf_stat_enabled) |
767 | account_sbals(q, count); | |
104ea556 | 768 | |
36e3e721 | 769 | break; |
779e6e1c | 770 | case SLSB_P_OUTPUT_ERROR: |
bffbbd2d | 771 | process_buffer_error(q, count); |
779e6e1c JG |
772 | q->first_to_check = add_buf(q->first_to_check, count); |
773 | atomic_sub(count, &q->nr_buf_used); | |
d307297f JG |
774 | if (q->irq_ptr->perf_stat_enabled) |
775 | account_sbals_error(q, count); | |
779e6e1c JG |
776 | break; |
777 | case SLSB_CU_OUTPUT_PRIMED: | |
778 | /* the adapter has not fetched the output yet */ | |
d307297f JG |
779 | if (q->irq_ptr->perf_stat_enabled) |
780 | q->q_stats.nr_sbal_nop++; | |
104ea556 | 781 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", |
782 | q->nr); | |
779e6e1c JG |
783 | break; |
784 | case SLSB_P_OUTPUT_NOT_INIT: | |
785 | case SLSB_P_OUTPUT_HALTED: | |
786 | break; | |
787 | default: | |
ce1d8014 | 788 | WARN_ON_ONCE(1); |
779e6e1c | 789 | } |
104ea556 | 790 | |
791 | out: | |
779e6e1c JG |
792 | return q->first_to_check; |
793 | } | |
794 | ||
795 | /* all buffers processed? */ | |
796 | static inline int qdio_outbound_q_done(struct qdio_q *q) | |
797 | { | |
798 | return atomic_read(&q->nr_buf_used) == 0; | |
799 | } | |
800 | ||
801 | static inline int qdio_outbound_q_moved(struct qdio_q *q) | |
802 | { | |
803 | int bufnr; | |
804 | ||
805 | bufnr = get_outbound_buffer_frontier(q); | |
806 | ||
1549d13f | 807 | if (bufnr != q->last_move) { |
e85dea0e | 808 | q->last_move = bufnr; |
22f99347 | 809 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr); |
779e6e1c JG |
810 | return 1; |
811 | } else | |
812 | return 0; | |
813 | } | |
814 | ||
104ea556 | 815 | static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob) |
779e6e1c | 816 | { |
be8d97a5 | 817 | int retries = 0, cc; |
7a0b4cbc | 818 | unsigned int busy_bit; |
779e6e1c JG |
819 | |
820 | if (!need_siga_out(q)) | |
d303b6fd | 821 | return 0; |
779e6e1c | 822 | |
7a0b4cbc | 823 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr); |
be8d97a5 | 824 | retry: |
6486cda6 | 825 | qperf_inc(q, siga_write); |
7a0b4cbc | 826 | |
104ea556 | 827 | cc = qdio_siga_output(q, &busy_bit, aob); |
7a0b4cbc | 828 | switch (cc) { |
779e6e1c | 829 | case 0: |
779e6e1c | 830 | break; |
7a0b4cbc JG |
831 | case 2: |
832 | if (busy_bit) { | |
be8d97a5 JG |
833 | while (++retries < QDIO_BUSY_BIT_RETRIES) { |
834 | mdelay(QDIO_BUSY_BIT_RETRY_DELAY); | |
835 | goto retry; | |
836 | } | |
837 | DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr); | |
1549d13f JG |
838 | cc = -EBUSY; |
839 | } else { | |
d303b6fd | 840 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr); |
1549d13f JG |
841 | cc = -ENOBUFS; |
842 | } | |
7a0b4cbc JG |
843 | break; |
844 | case 1: | |
845 | case 3: | |
846 | DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc); | |
1549d13f | 847 | cc = -EIO; |
7a0b4cbc | 848 | break; |
779e6e1c | 849 | } |
be8d97a5 JG |
850 | if (retries) { |
851 | DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr); | |
852 | DBF_ERROR("count:%u", retries); | |
853 | } | |
d303b6fd | 854 | return cc; |
779e6e1c JG |
855 | } |
856 | ||
779e6e1c JG |
857 | static void __qdio_outbound_processing(struct qdio_q *q) |
858 | { | |
6486cda6 | 859 | qperf_inc(q, tasklet_outbound); |
ce1d8014 | 860 | WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0); |
779e6e1c JG |
861 | |
862 | if (qdio_outbound_q_moved(q)) | |
9c8a08d7 | 863 | qdio_kick_handler(q); |
779e6e1c | 864 | |
c38f9608 | 865 | if (queue_type(q) == QDIO_ZFCP_QFMT) |
779e6e1c | 866 | if (!pci_out_supported(q) && !qdio_outbound_q_done(q)) |
c38f9608 | 867 | goto sched; |
779e6e1c | 868 | |
779e6e1c JG |
869 | if (q->u.out.pci_out_enabled) |
870 | return; | |
871 | ||
872 | /* | |
873 | * Now we know that queue type is either qeth without pci enabled | |
25f269f1 JG |
874 | * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY |
875 | * is noticed and outbound_handler is called after some time. | |
779e6e1c JG |
876 | */ |
877 | if (qdio_outbound_q_done(q)) | |
9bce8b2c | 878 | del_timer_sync(&q->u.out.timer); |
6486cda6 | 879 | else |
9bce8b2c UB |
880 | if (!timer_pending(&q->u.out.timer) && |
881 | likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) | |
779e6e1c | 882 | mod_timer(&q->u.out.timer, jiffies + 10 * HZ); |
c38f9608 JG |
883 | return; |
884 | ||
885 | sched: | |
9bce8b2c | 886 | qdio_tasklet_schedule(q); |
779e6e1c JG |
887 | } |
888 | ||
889 | /* outbound tasklet */ | |
890 | void qdio_outbound_processing(unsigned long data) | |
891 | { | |
892 | struct qdio_q *q = (struct qdio_q *)data; | |
893 | __qdio_outbound_processing(q); | |
894 | } | |
895 | ||
896 | void qdio_outbound_timer(unsigned long data) | |
897 | { | |
898 | struct qdio_q *q = (struct qdio_q *)data; | |
c38f9608 | 899 | |
9bce8b2c | 900 | qdio_tasklet_schedule(q); |
779e6e1c JG |
901 | } |
902 | ||
60b5df2f | 903 | static inline void qdio_check_outbound_after_thinint(struct qdio_q *q) |
779e6e1c JG |
904 | { |
905 | struct qdio_q *out; | |
906 | int i; | |
907 | ||
908 | if (!pci_out_supported(q)) | |
909 | return; | |
910 | ||
911 | for_each_output_queue(q->irq_ptr, out, i) | |
912 | if (!qdio_outbound_q_done(out)) | |
9bce8b2c | 913 | qdio_tasklet_schedule(out); |
779e6e1c JG |
914 | } |
915 | ||
60b5df2f JG |
916 | static void __tiqdio_inbound_processing(struct qdio_q *q) |
917 | { | |
6486cda6 | 918 | qperf_inc(q, tasklet_inbound); |
90adac58 JG |
919 | if (need_siga_sync(q) && need_siga_sync_after_ai(q)) |
920 | qdio_sync_queues(q); | |
60b5df2f JG |
921 | |
922 | /* | |
923 | * The interrupt could be caused by a PCI request. Check the | |
924 | * PCI capable outbound queues. | |
925 | */ | |
926 | qdio_check_outbound_after_thinint(q); | |
927 | ||
928 | if (!qdio_inbound_q_moved(q)) | |
929 | return; | |
930 | ||
931 | qdio_kick_handler(q); | |
932 | ||
9a2c160a | 933 | if (!qdio_inbound_q_done(q)) { |
6486cda6 | 934 | qperf_inc(q, tasklet_inbound_resched); |
9bce8b2c | 935 | if (!qdio_tasklet_schedule(q)) |
e2910bcf | 936 | return; |
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); |
9bce8b2c | 946 | qdio_tasklet_schedule(q); |
60b5df2f JG |
947 | } |
948 | } | |
949 | ||
950 | void tiqdio_inbound_processing(unsigned long data) | |
951 | { | |
952 | struct qdio_q *q = (struct qdio_q *)data; | |
953 | __tiqdio_inbound_processing(q); | |
954 | } | |
955 | ||
779e6e1c JG |
956 | static inline void qdio_set_state(struct qdio_irq *irq_ptr, |
957 | enum qdio_irq_states state) | |
958 | { | |
22f99347 | 959 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state); |
779e6e1c JG |
960 | |
961 | irq_ptr->state = state; | |
962 | mb(); | |
963 | } | |
964 | ||
22f99347 | 965 | static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb) |
779e6e1c | 966 | { |
779e6e1c | 967 | if (irb->esw.esw0.erw.cons) { |
22f99347 JG |
968 | DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no); |
969 | DBF_ERROR_HEX(irb, 64); | |
970 | DBF_ERROR_HEX(irb->ecw, 64); | |
779e6e1c JG |
971 | } |
972 | } | |
973 | ||
974 | /* PCI interrupt handler */ | |
975 | static void qdio_int_handler_pci(struct qdio_irq *irq_ptr) | |
976 | { | |
977 | int i; | |
978 | struct qdio_q *q; | |
979 | ||
9bce8b2c | 980 | if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) |
c38f9608 JG |
981 | return; |
982 | ||
d36deae7 JG |
983 | for_each_input_queue(irq_ptr, q, i) { |
984 | if (q->u.in.queue_start_poll) { | |
985 | /* skip if polling is enabled or already in work */ | |
986 | if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, | |
987 | &q->u.in.queue_irq_state)) { | |
988 | qperf_inc(q, int_discarded); | |
989 | continue; | |
990 | } | |
991 | q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr, | |
992 | q->irq_ptr->int_parm); | |
104ea556 | 993 | } else { |
d36deae7 | 994 | tasklet_schedule(&q->tasklet); |
104ea556 | 995 | } |
d36deae7 | 996 | } |
779e6e1c | 997 | |
0f308f4f | 998 | if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED)) |
779e6e1c JG |
999 | return; |
1000 | ||
1001 | for_each_output_queue(irq_ptr, q, i) { | |
1002 | if (qdio_outbound_q_done(q)) | |
1003 | continue; | |
90adac58 | 1004 | if (need_siga_sync(q) && need_siga_sync_out_after_pci(q)) |
779e6e1c | 1005 | qdio_siga_sync_q(q); |
9bce8b2c | 1006 | qdio_tasklet_schedule(q); |
779e6e1c JG |
1007 | } |
1008 | } | |
1009 | ||
1010 | static void qdio_handle_activate_check(struct ccw_device *cdev, | |
1011 | unsigned long intparm, int cstat, int dstat) | |
1012 | { | |
1013 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1014 | struct qdio_q *q; | |
dfe5bb50 | 1015 | int count; |
779e6e1c | 1016 | |
22f99347 JG |
1017 | DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no); |
1018 | DBF_ERROR("intp :%lx", intparm); | |
1019 | DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); | |
779e6e1c JG |
1020 | |
1021 | if (irq_ptr->nr_input_qs) { | |
1022 | q = irq_ptr->input_qs[0]; | |
1023 | } else if (irq_ptr->nr_output_qs) { | |
1024 | q = irq_ptr->output_qs[0]; | |
1025 | } else { | |
1026 | dump_stack(); | |
1027 | goto no_handler; | |
1028 | } | |
dfe5bb50 SS |
1029 | |
1030 | count = sub_buf(q->first_to_check, q->first_to_kick); | |
1549d13f | 1031 | q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE, |
dfe5bb50 | 1032 | q->nr, q->first_to_kick, count, irq_ptr->int_parm); |
779e6e1c JG |
1033 | no_handler: |
1034 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); | |
3ab121ab MH |
1035 | /* |
1036 | * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen. | |
1037 | * Therefore we call the LGR detection function here. | |
1038 | */ | |
1039 | lgr_info_log(); | |
779e6e1c JG |
1040 | } |
1041 | ||
4c575423 JG |
1042 | static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat, |
1043 | int dstat) | |
779e6e1c JG |
1044 | { |
1045 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1046 | ||
4c575423 | 1047 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq"); |
779e6e1c | 1048 | |
4c575423 | 1049 | if (cstat) |
779e6e1c | 1050 | goto error; |
4c575423 | 1051 | if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END)) |
779e6e1c | 1052 | goto error; |
4c575423 JG |
1053 | if (!(dstat & DEV_STAT_DEV_END)) |
1054 | goto error; | |
1055 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED); | |
1056 | return; | |
1057 | ||
779e6e1c | 1058 | error: |
22f99347 JG |
1059 | DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no); |
1060 | DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); | |
779e6e1c | 1061 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); |
779e6e1c JG |
1062 | } |
1063 | ||
1064 | /* qdio interrupt handler */ | |
1065 | void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm, | |
1066 | struct irb *irb) | |
1067 | { | |
1068 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
9080c924 | 1069 | struct subchannel_id schid; |
779e6e1c | 1070 | int cstat, dstat; |
779e6e1c | 1071 | |
779e6e1c | 1072 | if (!intparm || !irq_ptr) { |
9080c924 SO |
1073 | ccw_device_get_schid(cdev, &schid); |
1074 | DBF_ERROR("qint:%4x", schid.sch_no); | |
779e6e1c JG |
1075 | return; |
1076 | } | |
1077 | ||
09a308f3 JG |
1078 | if (irq_ptr->perf_stat_enabled) |
1079 | irq_ptr->perf_stat.qdio_int++; | |
1080 | ||
779e6e1c | 1081 | if (IS_ERR(irb)) { |
ce1d8014 JG |
1082 | DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no); |
1083 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); | |
1084 | wake_up(&cdev->private->wait_q); | |
1085 | return; | |
779e6e1c | 1086 | } |
22f99347 | 1087 | qdio_irq_check_sense(irq_ptr, irb); |
779e6e1c JG |
1088 | cstat = irb->scsw.cmd.cstat; |
1089 | dstat = irb->scsw.cmd.dstat; | |
1090 | ||
1091 | switch (irq_ptr->state) { | |
1092 | case QDIO_IRQ_STATE_INACTIVE: | |
1093 | qdio_establish_handle_irq(cdev, cstat, dstat); | |
1094 | break; | |
779e6e1c JG |
1095 | case QDIO_IRQ_STATE_CLEANUP: |
1096 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1097 | break; | |
779e6e1c JG |
1098 | case QDIO_IRQ_STATE_ESTABLISHED: |
1099 | case QDIO_IRQ_STATE_ACTIVE: | |
1100 | if (cstat & SCHN_STAT_PCI) { | |
1101 | qdio_int_handler_pci(irq_ptr); | |
779e6e1c JG |
1102 | return; |
1103 | } | |
4c575423 | 1104 | if (cstat || dstat) |
779e6e1c JG |
1105 | qdio_handle_activate_check(cdev, intparm, cstat, |
1106 | dstat); | |
4c575423 | 1107 | break; |
959153d3 JG |
1108 | case QDIO_IRQ_STATE_STOPPED: |
1109 | break; | |
779e6e1c | 1110 | default: |
ce1d8014 | 1111 | WARN_ON_ONCE(1); |
779e6e1c JG |
1112 | } |
1113 | wake_up(&cdev->private->wait_q); | |
1114 | } | |
1115 | ||
1116 | /** | |
1117 | * qdio_get_ssqd_desc - get qdio subchannel description | |
1118 | * @cdev: ccw device to get description for | |
bbd50e17 | 1119 | * @data: where to store the ssqd |
779e6e1c | 1120 | * |
bbd50e17 JG |
1121 | * Returns 0 or an error code. The results of the chsc are stored in the |
1122 | * specified structure. | |
779e6e1c | 1123 | */ |
bbd50e17 JG |
1124 | int qdio_get_ssqd_desc(struct ccw_device *cdev, |
1125 | struct qdio_ssqd_desc *data) | |
779e6e1c | 1126 | { |
9080c924 | 1127 | struct subchannel_id schid; |
779e6e1c | 1128 | |
bbd50e17 JG |
1129 | if (!cdev || !cdev->private) |
1130 | return -EINVAL; | |
1131 | ||
9080c924 SO |
1132 | ccw_device_get_schid(cdev, &schid); |
1133 | DBF_EVENT("get ssqd:%4x", schid.sch_no); | |
1134 | return qdio_setup_get_ssqd(NULL, &schid, data); | |
779e6e1c JG |
1135 | } |
1136 | EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc); | |
1137 | ||
779e6e1c JG |
1138 | static void qdio_shutdown_queues(struct ccw_device *cdev) |
1139 | { | |
1140 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1141 | struct qdio_q *q; | |
1142 | int i; | |
1143 | ||
1144 | for_each_input_queue(irq_ptr, q, i) | |
c38f9608 | 1145 | tasklet_kill(&q->tasklet); |
779e6e1c JG |
1146 | |
1147 | for_each_output_queue(irq_ptr, q, i) { | |
9bce8b2c | 1148 | del_timer_sync(&q->u.out.timer); |
c38f9608 | 1149 | tasklet_kill(&q->tasklet); |
779e6e1c JG |
1150 | } |
1151 | } | |
1152 | ||
1153 | /** | |
1154 | * qdio_shutdown - shut down a qdio subchannel | |
1155 | * @cdev: associated ccw device | |
1156 | * @how: use halt or clear to shutdown | |
1157 | */ | |
1158 | int qdio_shutdown(struct ccw_device *cdev, int how) | |
1159 | { | |
22f99347 | 1160 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
9080c924 | 1161 | struct subchannel_id schid; |
779e6e1c | 1162 | int rc; |
779e6e1c | 1163 | |
779e6e1c JG |
1164 | if (!irq_ptr) |
1165 | return -ENODEV; | |
1166 | ||
ce1d8014 | 1167 | WARN_ON_ONCE(irqs_disabled()); |
9080c924 SO |
1168 | ccw_device_get_schid(cdev, &schid); |
1169 | DBF_EVENT("qshutdown:%4x", schid.sch_no); | |
22f99347 | 1170 | |
779e6e1c JG |
1171 | mutex_lock(&irq_ptr->setup_mutex); |
1172 | /* | |
1173 | * Subchannel was already shot down. We cannot prevent being called | |
1174 | * twice since cio may trigger a shutdown asynchronously. | |
1175 | */ | |
1176 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { | |
1177 | mutex_unlock(&irq_ptr->setup_mutex); | |
1178 | return 0; | |
1179 | } | |
1180 | ||
c38f9608 JG |
1181 | /* |
1182 | * Indicate that the device is going down. Scheduling the queue | |
1183 | * tasklets is forbidden from here on. | |
1184 | */ | |
1185 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); | |
1186 | ||
779e6e1c JG |
1187 | tiqdio_remove_input_queues(irq_ptr); |
1188 | qdio_shutdown_queues(cdev); | |
aa2383f8 | 1189 | qdio_shutdown_debug_entries(irq_ptr); |
779e6e1c JG |
1190 | |
1191 | /* cleanup subchannel */ | |
a48ed867 | 1192 | spin_lock_irq(get_ccwdev_lock(cdev)); |
779e6e1c JG |
1193 | |
1194 | if (how & QDIO_FLAG_CLEANUP_USING_CLEAR) | |
1195 | rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP); | |
1196 | else | |
1197 | /* default behaviour is halt */ | |
1198 | rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP); | |
1199 | if (rc) { | |
22f99347 JG |
1200 | DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no); |
1201 | DBF_ERROR("rc:%4d", rc); | |
779e6e1c JG |
1202 | goto no_cleanup; |
1203 | } | |
1204 | ||
1205 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP); | |
a48ed867 | 1206 | spin_unlock_irq(get_ccwdev_lock(cdev)); |
779e6e1c JG |
1207 | wait_event_interruptible_timeout(cdev->private->wait_q, |
1208 | irq_ptr->state == QDIO_IRQ_STATE_INACTIVE || | |
1209 | irq_ptr->state == QDIO_IRQ_STATE_ERR, | |
1210 | 10 * HZ); | |
a48ed867 | 1211 | spin_lock_irq(get_ccwdev_lock(cdev)); |
779e6e1c JG |
1212 | |
1213 | no_cleanup: | |
1214 | qdio_shutdown_thinint(irq_ptr); | |
1215 | ||
1216 | /* restore interrupt handler */ | |
1217 | if ((void *)cdev->handler == (void *)qdio_int_handler) | |
1218 | cdev->handler = irq_ptr->orig_handler; | |
a48ed867 | 1219 | spin_unlock_irq(get_ccwdev_lock(cdev)); |
779e6e1c JG |
1220 | |
1221 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1222 | mutex_unlock(&irq_ptr->setup_mutex); | |
779e6e1c JG |
1223 | if (rc) |
1224 | return rc; | |
1225 | return 0; | |
1226 | } | |
1227 | EXPORT_SYMBOL_GPL(qdio_shutdown); | |
1228 | ||
1229 | /** | |
1230 | * qdio_free - free data structures for a qdio subchannel | |
1231 | * @cdev: associated ccw device | |
1232 | */ | |
1233 | int qdio_free(struct ccw_device *cdev) | |
1234 | { | |
22f99347 | 1235 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
9080c924 | 1236 | struct subchannel_id schid; |
58eb27cd | 1237 | |
779e6e1c JG |
1238 | if (!irq_ptr) |
1239 | return -ENODEV; | |
1240 | ||
9080c924 SO |
1241 | ccw_device_get_schid(cdev, &schid); |
1242 | DBF_EVENT("qfree:%4x", schid.sch_no); | |
613c4e04 | 1243 | DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned"); |
779e6e1c | 1244 | mutex_lock(&irq_ptr->setup_mutex); |
22f99347 | 1245 | |
613c4e04 | 1246 | irq_ptr->debug_area = NULL; |
779e6e1c JG |
1247 | cdev->private->qdio_data = NULL; |
1248 | mutex_unlock(&irq_ptr->setup_mutex); | |
1249 | ||
1250 | qdio_release_memory(irq_ptr); | |
1251 | return 0; | |
1252 | } | |
1253 | EXPORT_SYMBOL_GPL(qdio_free); | |
1254 | ||
779e6e1c JG |
1255 | /** |
1256 | * qdio_allocate - allocate qdio queues and associated data | |
1257 | * @init_data: initialization data | |
1258 | */ | |
1259 | int qdio_allocate(struct qdio_initialize *init_data) | |
1260 | { | |
9080c924 | 1261 | struct subchannel_id schid; |
779e6e1c | 1262 | struct qdio_irq *irq_ptr; |
779e6e1c | 1263 | |
9080c924 SO |
1264 | ccw_device_get_schid(init_data->cdev, &schid); |
1265 | DBF_EVENT("qallocate:%4x", schid.sch_no); | |
779e6e1c JG |
1266 | |
1267 | if ((init_data->no_input_qs && !init_data->input_handler) || | |
1268 | (init_data->no_output_qs && !init_data->output_handler)) | |
1269 | return -EINVAL; | |
1270 | ||
1271 | if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) || | |
1272 | (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)) | |
1273 | return -EINVAL; | |
1274 | ||
1275 | if ((!init_data->input_sbal_addr_array) || | |
1276 | (!init_data->output_sbal_addr_array)) | |
1277 | return -EINVAL; | |
1278 | ||
779e6e1c JG |
1279 | /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */ |
1280 | irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
1281 | if (!irq_ptr) | |
1282 | goto out_err; | |
779e6e1c JG |
1283 | |
1284 | mutex_init(&irq_ptr->setup_mutex); | |
613c4e04 SR |
1285 | if (qdio_allocate_dbf(init_data, irq_ptr)) |
1286 | goto out_rel; | |
779e6e1c JG |
1287 | |
1288 | /* | |
1289 | * Allocate a page for the chsc calls in qdio_establish. | |
1290 | * Must be pre-allocated since a zfcp recovery will call | |
1291 | * qdio_establish. In case of low memory and swap on a zfcp disk | |
1292 | * we may not be able to allocate memory otherwise. | |
1293 | */ | |
1294 | irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL); | |
1295 | if (!irq_ptr->chsc_page) | |
1296 | goto out_rel; | |
1297 | ||
1298 | /* qdr is used in ccw1.cda which is u32 */ | |
3b8e3004 | 1299 | irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
779e6e1c JG |
1300 | if (!irq_ptr->qdr) |
1301 | goto out_rel; | |
779e6e1c | 1302 | |
779e6e1c JG |
1303 | if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs, |
1304 | init_data->no_output_qs)) | |
1305 | goto out_rel; | |
1306 | ||
1307 | init_data->cdev->private->qdio_data = irq_ptr; | |
1308 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); | |
1309 | return 0; | |
1310 | out_rel: | |
1311 | qdio_release_memory(irq_ptr); | |
1312 | out_err: | |
1313 | return -ENOMEM; | |
1314 | } | |
1315 | EXPORT_SYMBOL_GPL(qdio_allocate); | |
1316 | ||
104ea556 | 1317 | static void qdio_detect_hsicq(struct qdio_irq *irq_ptr) |
1318 | { | |
1319 | struct qdio_q *q = irq_ptr->input_qs[0]; | |
1320 | int i, use_cq = 0; | |
1321 | ||
1322 | if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT) | |
1323 | use_cq = 1; | |
1324 | ||
1325 | for_each_output_queue(irq_ptr, q, i) { | |
1326 | if (use_cq) { | |
1327 | if (qdio_enable_async_operation(&q->u.out) < 0) { | |
1328 | use_cq = 0; | |
1329 | continue; | |
1330 | } | |
1331 | } else | |
1332 | qdio_disable_async_operation(&q->u.out); | |
1333 | } | |
1334 | DBF_EVENT("use_cq:%d", use_cq); | |
1335 | } | |
1336 | ||
779e6e1c JG |
1337 | /** |
1338 | * qdio_establish - establish queues on a qdio subchannel | |
1339 | * @init_data: initialization data | |
1340 | */ | |
1341 | int qdio_establish(struct qdio_initialize *init_data) | |
1342 | { | |
779e6e1c | 1343 | struct ccw_device *cdev = init_data->cdev; |
9080c924 SO |
1344 | struct subchannel_id schid; |
1345 | struct qdio_irq *irq_ptr; | |
779e6e1c JG |
1346 | int rc; |
1347 | ||
9080c924 SO |
1348 | ccw_device_get_schid(cdev, &schid); |
1349 | DBF_EVENT("qestablish:%4x", schid.sch_no); | |
58eb27cd | 1350 | |
779e6e1c JG |
1351 | irq_ptr = cdev->private->qdio_data; |
1352 | if (!irq_ptr) | |
1353 | return -ENODEV; | |
1354 | ||
779e6e1c JG |
1355 | mutex_lock(&irq_ptr->setup_mutex); |
1356 | qdio_setup_irq(init_data); | |
1357 | ||
1358 | rc = qdio_establish_thinint(irq_ptr); | |
1359 | if (rc) { | |
1360 | mutex_unlock(&irq_ptr->setup_mutex); | |
1361 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1362 | return rc; | |
1363 | } | |
1364 | ||
1365 | /* establish q */ | |
1366 | irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd; | |
1367 | irq_ptr->ccw.flags = CCW_FLAG_SLI; | |
1368 | irq_ptr->ccw.count = irq_ptr->equeue.count; | |
1369 | irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr); | |
1370 | ||
a48ed867 | 1371 | spin_lock_irq(get_ccwdev_lock(cdev)); |
779e6e1c JG |
1372 | ccw_device_set_options_mask(cdev, 0); |
1373 | ||
1374 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0); | |
ddebf661 | 1375 | spin_unlock_irq(get_ccwdev_lock(cdev)); |
779e6e1c | 1376 | if (rc) { |
22f99347 JG |
1377 | DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no); |
1378 | DBF_ERROR("rc:%4x", rc); | |
779e6e1c JG |
1379 | mutex_unlock(&irq_ptr->setup_mutex); |
1380 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1381 | return rc; | |
1382 | } | |
1383 | ||
1384 | wait_event_interruptible_timeout(cdev->private->wait_q, | |
1385 | irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED || | |
1386 | irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ); | |
1387 | ||
1388 | if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) { | |
1389 | mutex_unlock(&irq_ptr->setup_mutex); | |
1390 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); | |
1391 | return -EIO; | |
1392 | } | |
1393 | ||
1394 | qdio_setup_ssqd_info(irq_ptr); | |
779e6e1c | 1395 | |
104ea556 | 1396 | qdio_detect_hsicq(irq_ptr); |
1397 | ||
779e6e1c JG |
1398 | /* qebsm is now setup if available, initialize buffer states */ |
1399 | qdio_init_buf_states(irq_ptr); | |
1400 | ||
1401 | mutex_unlock(&irq_ptr->setup_mutex); | |
1402 | qdio_print_subchannel_info(irq_ptr, cdev); | |
1403 | qdio_setup_debug_entries(irq_ptr, cdev); | |
1404 | return 0; | |
1405 | } | |
1406 | EXPORT_SYMBOL_GPL(qdio_establish); | |
1407 | ||
1408 | /** | |
1409 | * qdio_activate - activate queues on a qdio subchannel | |
1410 | * @cdev: associated cdev | |
1411 | */ | |
1412 | int qdio_activate(struct ccw_device *cdev) | |
1413 | { | |
9080c924 | 1414 | struct subchannel_id schid; |
779e6e1c JG |
1415 | struct qdio_irq *irq_ptr; |
1416 | int rc; | |
779e6e1c | 1417 | |
9080c924 SO |
1418 | ccw_device_get_schid(cdev, &schid); |
1419 | DBF_EVENT("qactivate:%4x", schid.sch_no); | |
58eb27cd | 1420 | |
779e6e1c JG |
1421 | irq_ptr = cdev->private->qdio_data; |
1422 | if (!irq_ptr) | |
1423 | return -ENODEV; | |
1424 | ||
779e6e1c JG |
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 | ||
a48ed867 | 1436 | spin_lock_irq(get_ccwdev_lock(cdev)); |
779e6e1c JG |
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); | |
ddebf661 | 1441 | spin_unlock_irq(get_ccwdev_lock(cdev)); |
779e6e1c | 1442 | if (rc) { |
22f99347 JG |
1443 | DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no); |
1444 | DBF_ERROR("rc:%4x", rc); | |
779e6e1c | 1445 | goto out; |
ddebf661 | 1446 | } |
779e6e1c JG |
1447 | |
1448 | if (is_thinint_irq(irq_ptr)) | |
1449 | tiqdio_add_input_queues(irq_ptr); | |
1450 | ||
1451 | /* wait for subchannel to become active */ | |
1452 | msleep(5); | |
1453 | ||
1454 | switch (irq_ptr->state) { | |
1455 | case QDIO_IRQ_STATE_STOPPED: | |
1456 | case QDIO_IRQ_STATE_ERR: | |
e4c14e20 JG |
1457 | rc = -EIO; |
1458 | break; | |
779e6e1c JG |
1459 | default: |
1460 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE); | |
1461 | rc = 0; | |
1462 | } | |
1463 | out: | |
1464 | mutex_unlock(&irq_ptr->setup_mutex); | |
1465 | return rc; | |
1466 | } | |
1467 | EXPORT_SYMBOL_GPL(qdio_activate); | |
1468 | ||
1469 | static inline int buf_in_between(int bufnr, int start, int count) | |
1470 | { | |
1471 | int end = add_buf(start, count); | |
1472 | ||
1473 | if (end > start) { | |
1474 | if (bufnr >= start && bufnr < end) | |
1475 | return 1; | |
1476 | else | |
1477 | return 0; | |
1478 | } | |
1479 | ||
1480 | /* wrap-around case */ | |
1481 | if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) || | |
1482 | (bufnr < end)) | |
1483 | return 1; | |
1484 | else | |
1485 | return 0; | |
1486 | } | |
1487 | ||
1488 | /** | |
1489 | * handle_inbound - reset processed input buffers | |
1490 | * @q: queue containing the buffers | |
1491 | * @callflags: flags | |
1492 | * @bufnr: first buffer to process | |
1493 | * @count: how many buffers are emptied | |
1494 | */ | |
d303b6fd JG |
1495 | static int handle_inbound(struct qdio_q *q, unsigned int callflags, |
1496 | int bufnr, int count) | |
779e6e1c | 1497 | { |
dae7fd42 | 1498 | int diff; |
779e6e1c | 1499 | |
6486cda6 JG |
1500 | qperf_inc(q, inbound_call); |
1501 | ||
50f769df JG |
1502 | if (!q->u.in.polling) |
1503 | goto set; | |
1504 | ||
1505 | /* protect against stop polling setting an ACK for an emptied slsb */ | |
1506 | if (count == QDIO_MAX_BUFFERS_PER_Q) { | |
1507 | /* overwriting everything, just delete polling status */ | |
1508 | q->u.in.polling = 0; | |
1509 | q->u.in.ack_count = 0; | |
1510 | goto set; | |
e85dea0e | 1511 | } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) { |
50f769df | 1512 | if (is_qebsm(q)) { |
e85dea0e | 1513 | /* partial overwrite, just update ack_start */ |
50f769df | 1514 | diff = add_buf(bufnr, count); |
e85dea0e | 1515 | diff = sub_buf(diff, q->u.in.ack_start); |
50f769df JG |
1516 | q->u.in.ack_count -= diff; |
1517 | if (q->u.in.ack_count <= 0) { | |
1518 | q->u.in.polling = 0; | |
1519 | q->u.in.ack_count = 0; | |
50f769df JG |
1520 | goto set; |
1521 | } | |
e85dea0e | 1522 | q->u.in.ack_start = add_buf(q->u.in.ack_start, diff); |
50f769df JG |
1523 | } |
1524 | else | |
1525 | /* the only ACK will be deleted, so stop polling */ | |
779e6e1c | 1526 | q->u.in.polling = 0; |
50f769df | 1527 | } |
779e6e1c | 1528 | |
50f769df | 1529 | set: |
779e6e1c | 1530 | count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count); |
dae7fd42 | 1531 | atomic_add(count, &q->nr_buf_used); |
779e6e1c | 1532 | |
d303b6fd JG |
1533 | if (need_siga_in(q)) |
1534 | return qdio_siga_input(q); | |
9cb7284f | 1535 | |
d303b6fd | 1536 | return 0; |
779e6e1c JG |
1537 | } |
1538 | ||
1539 | /** | |
1540 | * handle_outbound - process filled outbound buffers | |
1541 | * @q: queue containing the buffers | |
1542 | * @callflags: flags | |
1543 | * @bufnr: first buffer to process | |
1544 | * @count: how many buffers are filled | |
1545 | */ | |
d303b6fd JG |
1546 | static int handle_outbound(struct qdio_q *q, unsigned int callflags, |
1547 | int bufnr, int count) | |
779e6e1c | 1548 | { |
c26001d4 | 1549 | unsigned char state = 0; |
d303b6fd | 1550 | int used, rc = 0; |
779e6e1c | 1551 | |
6486cda6 | 1552 | qperf_inc(q, outbound_call); |
779e6e1c JG |
1553 | |
1554 | count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count); | |
1555 | used = atomic_add_return(count, &q->nr_buf_used); | |
779e6e1c | 1556 | |
0195843b JG |
1557 | if (used == QDIO_MAX_BUFFERS_PER_Q) |
1558 | qperf_inc(q, outbound_queue_full); | |
1559 | ||
6486cda6 | 1560 | if (callflags & QDIO_FLAG_PCI_OUT) { |
779e6e1c | 1561 | q->u.out.pci_out_enabled = 1; |
6486cda6 | 1562 | qperf_inc(q, pci_request_int); |
110da317 | 1563 | } else |
779e6e1c JG |
1564 | q->u.out.pci_out_enabled = 0; |
1565 | ||
1566 | if (queue_type(q) == QDIO_IQDIO_QFMT) { | |
104ea556 | 1567 | unsigned long phys_aob = 0; |
1568 | ||
1569 | /* One SIGA-W per buffer required for unicast HSI */ | |
110da317 JG |
1570 | WARN_ON_ONCE(count > 1 && !multicast_outbound(q)); |
1571 | ||
104ea556 | 1572 | phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr); |
1573 | ||
1574 | rc = qdio_kick_outbound_q(q, phys_aob); | |
90adac58 | 1575 | } else if (need_siga_sync(q)) { |
110da317 JG |
1576 | rc = qdio_siga_sync_q(q); |
1577 | } else { | |
1578 | /* try to fast requeue buffers */ | |
1579 | get_buf_state(q, prev_buf(bufnr), &state, 0); | |
1580 | if (state != SLSB_CU_OUTPUT_PRIMED) | |
104ea556 | 1581 | rc = qdio_kick_outbound_q(q, 0); |
779e6e1c | 1582 | else |
110da317 | 1583 | qperf_inc(q, fast_requeue); |
779e6e1c JG |
1584 | } |
1585 | ||
3d6c76ff JG |
1586 | /* in case of SIGA errors we must process the error immediately */ |
1587 | if (used >= q->u.out.scan_threshold || rc) | |
9bce8b2c | 1588 | qdio_tasklet_schedule(q); |
3d6c76ff JG |
1589 | else |
1590 | /* free the SBALs in case of no further traffic */ | |
9bce8b2c UB |
1591 | if (!timer_pending(&q->u.out.timer) && |
1592 | likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) | |
3d6c76ff | 1593 | mod_timer(&q->u.out.timer, jiffies + HZ); |
d303b6fd | 1594 | return rc; |
779e6e1c JG |
1595 | } |
1596 | ||
1597 | /** | |
1598 | * do_QDIO - process input or output buffers | |
1599 | * @cdev: associated ccw_device for the qdio subchannel | |
1600 | * @callflags: input or output and special flags from the program | |
1601 | * @q_nr: queue number | |
1602 | * @bufnr: buffer number | |
1603 | * @count: how many buffers to process | |
1604 | */ | |
1605 | int do_QDIO(struct ccw_device *cdev, unsigned int callflags, | |
6618241b | 1606 | int q_nr, unsigned int bufnr, unsigned int count) |
779e6e1c JG |
1607 | { |
1608 | struct qdio_irq *irq_ptr; | |
779e6e1c | 1609 | |
6618241b | 1610 | if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q) |
779e6e1c JG |
1611 | return -EINVAL; |
1612 | ||
779e6e1c JG |
1613 | irq_ptr = cdev->private->qdio_data; |
1614 | if (!irq_ptr) | |
1615 | return -ENODEV; | |
1616 | ||
1d7e1500 JG |
1617 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, |
1618 | "do%02x b:%02x c:%02x", callflags, bufnr, count); | |
779e6e1c JG |
1619 | |
1620 | if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE) | |
1549d13f | 1621 | return -EIO; |
9a26513e JG |
1622 | if (!count) |
1623 | return 0; | |
779e6e1c | 1624 | if (callflags & QDIO_FLAG_SYNC_INPUT) |
d303b6fd JG |
1625 | return handle_inbound(irq_ptr->input_qs[q_nr], |
1626 | callflags, bufnr, count); | |
779e6e1c | 1627 | else if (callflags & QDIO_FLAG_SYNC_OUTPUT) |
d303b6fd JG |
1628 | return handle_outbound(irq_ptr->output_qs[q_nr], |
1629 | callflags, bufnr, count); | |
1630 | return -EINVAL; | |
779e6e1c JG |
1631 | } |
1632 | EXPORT_SYMBOL_GPL(do_QDIO); | |
1633 | ||
d36deae7 JG |
1634 | /** |
1635 | * qdio_start_irq - process input buffers | |
1636 | * @cdev: associated ccw_device for the qdio subchannel | |
1637 | * @nr: input queue number | |
1638 | * | |
1639 | * Return codes | |
1640 | * 0 - success | |
1641 | * 1 - irqs not started since new data is available | |
1642 | */ | |
1643 | int qdio_start_irq(struct ccw_device *cdev, int nr) | |
1644 | { | |
1645 | struct qdio_q *q; | |
1646 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1647 | ||
1648 | if (!irq_ptr) | |
1649 | return -ENODEV; | |
1650 | q = irq_ptr->input_qs[nr]; | |
1651 | ||
5f4026f8 | 1652 | clear_nonshared_ind(irq_ptr); |
d36deae7 JG |
1653 | qdio_stop_polling(q); |
1654 | clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state); | |
1655 | ||
1656 | /* | |
1657 | * We need to check again to not lose initiative after | |
1658 | * resetting the ACK state. | |
1659 | */ | |
5f4026f8 | 1660 | if (test_nonshared_ind(irq_ptr)) |
d36deae7 JG |
1661 | goto rescan; |
1662 | if (!qdio_inbound_q_done(q)) | |
1663 | goto rescan; | |
1664 | return 0; | |
1665 | ||
1666 | rescan: | |
1667 | if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, | |
1668 | &q->u.in.queue_irq_state)) | |
1669 | return 0; | |
1670 | else | |
1671 | return 1; | |
1672 | ||
1673 | } | |
1674 | EXPORT_SYMBOL(qdio_start_irq); | |
1675 | ||
1676 | /** | |
1677 | * qdio_get_next_buffers - process input buffers | |
1678 | * @cdev: associated ccw_device for the qdio subchannel | |
1679 | * @nr: input queue number | |
1680 | * @bufnr: first filled buffer number | |
1681 | * @error: buffers are in error state | |
1682 | * | |
1683 | * Return codes | |
1684 | * < 0 - error | |
1685 | * = 0 - no new buffers found | |
1686 | * > 0 - number of processed buffers | |
1687 | */ | |
1688 | int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr, | |
1689 | int *error) | |
1690 | { | |
1691 | struct qdio_q *q; | |
1692 | int start, end; | |
1693 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1694 | ||
1695 | if (!irq_ptr) | |
1696 | return -ENODEV; | |
1697 | q = irq_ptr->input_qs[nr]; | |
d36deae7 | 1698 | |
d36deae7 | 1699 | /* |
90adac58 JG |
1700 | * Cannot rely on automatic sync after interrupt since queues may |
1701 | * also be examined without interrupt. | |
d36deae7 | 1702 | */ |
90adac58 JG |
1703 | if (need_siga_sync(q)) |
1704 | qdio_sync_queues(q); | |
1705 | ||
1706 | /* check the PCI capable outbound queues. */ | |
d36deae7 JG |
1707 | qdio_check_outbound_after_thinint(q); |
1708 | ||
1709 | if (!qdio_inbound_q_moved(q)) | |
1710 | return 0; | |
1711 | ||
1712 | /* Note: upper-layer MUST stop processing immediately here ... */ | |
1713 | if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) | |
1714 | return -EIO; | |
1715 | ||
1716 | start = q->first_to_kick; | |
1717 | end = q->first_to_check; | |
1718 | *bufnr = start; | |
1719 | *error = q->qdio_error; | |
1720 | ||
1721 | /* for the next time */ | |
1722 | q->first_to_kick = end; | |
1723 | q->qdio_error = 0; | |
1724 | return sub_buf(end, start); | |
1725 | } | |
1726 | EXPORT_SYMBOL(qdio_get_next_buffers); | |
1727 | ||
1728 | /** | |
1729 | * qdio_stop_irq - disable interrupt processing for the device | |
1730 | * @cdev: associated ccw_device for the qdio subchannel | |
1731 | * @nr: input queue number | |
1732 | * | |
1733 | * Return codes | |
1734 | * 0 - interrupts were already disabled | |
1735 | * 1 - interrupts successfully disabled | |
1736 | */ | |
1737 | int qdio_stop_irq(struct ccw_device *cdev, int nr) | |
1738 | { | |
1739 | struct qdio_q *q; | |
1740 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; | |
1741 | ||
1742 | if (!irq_ptr) | |
1743 | return -ENODEV; | |
1744 | q = irq_ptr->input_qs[nr]; | |
1745 | ||
1746 | if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, | |
1747 | &q->u.in.queue_irq_state)) | |
1748 | return 0; | |
1749 | else | |
1750 | return 1; | |
1751 | } | |
1752 | EXPORT_SYMBOL(qdio_stop_irq); | |
1753 | ||
1c59a861 EC |
1754 | /** |
1755 | * qdio_pnso_brinfo() - perform network subchannel op #0 - bridge info. | |
1756 | * @schid: Subchannel ID. | |
1757 | * @cnc: Boolean Change-Notification Control | |
1758 | * @response: Response code will be stored at this address | |
1759 | * @cb: Callback function will be executed for each element | |
1760 | * of the address list | |
1761 | * @priv: Pointer passed from the caller to qdio_pnso_brinfo() | |
1762 | * @type: Type of the address entry passed to the callback | |
1763 | * @entry: Entry containg the address of the specified type | |
1764 | * @priv: Pointer to pass to the callback function. | |
1765 | * | |
1766 | * Performs "Store-network-bridging-information list" operation and calls | |
1767 | * the callback function for every entry in the list. If "change- | |
1768 | * notification-control" is set, further changes in the address list | |
1769 | * will be reported via the IPA command. | |
1770 | */ | |
1771 | int qdio_pnso_brinfo(struct subchannel_id schid, | |
1772 | int cnc, u16 *response, | |
1773 | void (*cb)(void *priv, enum qdio_brinfo_entry_type type, | |
1774 | void *entry), | |
1775 | void *priv) | |
1776 | { | |
1777 | struct chsc_pnso_area *rr; | |
1778 | int rc; | |
1779 | u32 prev_instance = 0; | |
1780 | int isfirstblock = 1; | |
1781 | int i, size, elems; | |
1782 | ||
1783 | rr = (struct chsc_pnso_area *)get_zeroed_page(GFP_KERNEL); | |
1784 | if (rr == NULL) | |
1785 | return -ENOMEM; | |
1786 | do { | |
1787 | /* on the first iteration, naihdr.resume_token will be zero */ | |
1788 | rc = chsc_pnso_brinfo(schid, rr, rr->naihdr.resume_token, cnc); | |
1789 | if (rc != 0 && rc != -EBUSY) | |
1790 | goto out; | |
1791 | if (rr->response.code != 1) { | |
1792 | rc = -EIO; | |
1793 | continue; | |
1794 | } else | |
1795 | rc = 0; | |
1796 | ||
1797 | if (cb == NULL) | |
1798 | continue; | |
1799 | ||
1800 | size = rr->naihdr.naids; | |
1801 | elems = (rr->response.length - | |
1802 | sizeof(struct chsc_header) - | |
1803 | sizeof(struct chsc_brinfo_naihdr)) / | |
1804 | size; | |
1805 | ||
1806 | if (!isfirstblock && (rr->naihdr.instance != prev_instance)) { | |
1807 | /* Inform the caller that they need to scrap */ | |
1808 | /* the data that was already reported via cb */ | |
1809 | rc = -EAGAIN; | |
1810 | break; | |
1811 | } | |
1812 | isfirstblock = 0; | |
1813 | prev_instance = rr->naihdr.instance; | |
1814 | for (i = 0; i < elems; i++) | |
1815 | switch (size) { | |
1816 | case sizeof(struct qdio_brinfo_entry_l3_ipv6): | |
1817 | (*cb)(priv, l3_ipv6_addr, | |
1818 | &rr->entries.l3_ipv6[i]); | |
1819 | break; | |
1820 | case sizeof(struct qdio_brinfo_entry_l3_ipv4): | |
1821 | (*cb)(priv, l3_ipv4_addr, | |
1822 | &rr->entries.l3_ipv4[i]); | |
1823 | break; | |
1824 | case sizeof(struct qdio_brinfo_entry_l2): | |
1825 | (*cb)(priv, l2_addr_lnid, | |
1826 | &rr->entries.l2[i]); | |
1827 | break; | |
1828 | default: | |
1829 | WARN_ON_ONCE(1); | |
1830 | rc = -EIO; | |
1831 | goto out; | |
1832 | } | |
1833 | } while (rr->response.code == 0x0107 || /* channel busy */ | |
1834 | (rr->response.code == 1 && /* list stored */ | |
1835 | /* resume token is non-zero => list incomplete */ | |
1836 | (rr->naihdr.resume_token.t1 || rr->naihdr.resume_token.t2))); | |
1837 | (*response) = rr->response.code; | |
1838 | ||
1839 | out: | |
1840 | free_page((unsigned long)rr); | |
1841 | return rc; | |
1842 | } | |
1843 | EXPORT_SYMBOL_GPL(qdio_pnso_brinfo); | |
1844 | ||
779e6e1c JG |
1845 | static int __init init_QDIO(void) |
1846 | { | |
1847 | int rc; | |
1848 | ||
aa5c8df3 | 1849 | rc = qdio_debug_init(); |
779e6e1c JG |
1850 | if (rc) |
1851 | return rc; | |
aa5c8df3 SO |
1852 | rc = qdio_setup_init(); |
1853 | if (rc) | |
1854 | goto out_debug; | |
779e6e1c JG |
1855 | rc = tiqdio_allocate_memory(); |
1856 | if (rc) | |
1857 | goto out_cache; | |
779e6e1c JG |
1858 | rc = tiqdio_register_thinints(); |
1859 | if (rc) | |
aa5c8df3 | 1860 | goto out_ti; |
779e6e1c JG |
1861 | return 0; |
1862 | ||
779e6e1c JG |
1863 | out_ti: |
1864 | tiqdio_free_memory(); | |
1865 | out_cache: | |
1866 | qdio_setup_exit(); | |
aa5c8df3 SO |
1867 | out_debug: |
1868 | qdio_debug_exit(); | |
779e6e1c JG |
1869 | return rc; |
1870 | } | |
1871 | ||
1872 | static void __exit exit_QDIO(void) | |
1873 | { | |
1874 | tiqdio_unregister_thinints(); | |
1875 | tiqdio_free_memory(); | |
779e6e1c | 1876 | qdio_setup_exit(); |
aa5c8df3 | 1877 | qdio_debug_exit(); |
779e6e1c JG |
1878 | } |
1879 | ||
1880 | module_init(init_QDIO); | |
1881 | module_exit(exit_QDIO); |