blob: 5fcfa7f9e9ef7d4530e94ec79d2328d6349e95d9 [file] [log] [blame]
Jan Glauber779e6e12008-07-17 17:16:48 +02001/*
2 * linux/drivers/s390/cio/qdio_main.c
3 *
4 * Linux for s390 qdio support, buffer handling, qdio API and module support.
5 *
6 * Copyright 2000,2008 IBM Corp.
7 * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
8 * Jan Glauber <jang@linux.vnet.ibm.com>
9 * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
10 */
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/timer.h>
15#include <linux/delay.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090016#include <linux/gfp.h>
Jan Glauber779e6e12008-07-17 17:16:48 +020017#include <asm/atomic.h>
18#include <asm/debug.h>
19#include <asm/qdio.h>
20
21#include "cio.h"
22#include "css.h"
23#include "device.h"
24#include "qdio.h"
25#include "qdio_debug.h"
Jan Glauber779e6e12008-07-17 17:16:48 +020026
27MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
28 "Jan Glauber <jang@linux.vnet.ibm.com>");
29MODULE_DESCRIPTION("QDIO base support");
30MODULE_LICENSE("GPL");
31
32static inline int do_siga_sync(struct subchannel_id schid,
33 unsigned int out_mask, unsigned int in_mask)
34{
35 register unsigned long __fc asm ("0") = 2;
36 register struct subchannel_id __schid asm ("1") = schid;
37 register unsigned long out asm ("2") = out_mask;
38 register unsigned long in asm ("3") = in_mask;
39 int cc;
40
41 asm volatile(
42 " siga 0\n"
43 " ipm %0\n"
44 " srl %0,28\n"
45 : "=d" (cc)
46 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
47 return cc;
48}
49
50static inline int do_siga_input(struct subchannel_id schid, unsigned int mask)
51{
52 register unsigned long __fc asm ("0") = 1;
53 register struct subchannel_id __schid asm ("1") = schid;
54 register unsigned long __mask asm ("2") = mask;
55 int cc;
56
57 asm volatile(
58 " siga 0\n"
59 " ipm %0\n"
60 " srl %0,28\n"
61 : "=d" (cc)
62 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory");
63 return cc;
64}
65
66/**
67 * do_siga_output - perform SIGA-w/wt function
68 * @schid: subchannel id or in case of QEBSM the subchannel token
69 * @mask: which output queues to process
70 * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
71 * @fc: function code to perform
72 *
73 * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION.
74 * Note: For IQDC unicast queues only the highest priority queue is processed.
75 */
76static inline int do_siga_output(unsigned long schid, unsigned long mask,
Jan Glauber7a0b4cb2008-12-25 13:38:48 +010077 unsigned int *bb, unsigned int fc)
Jan Glauber779e6e12008-07-17 17:16:48 +020078{
79 register unsigned long __fc asm("0") = fc;
80 register unsigned long __schid asm("1") = schid;
81 register unsigned long __mask asm("2") = mask;
82 int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION;
83
84 asm volatile(
85 " siga 0\n"
86 "0: ipm %0\n"
87 " srl %0,28\n"
88 "1:\n"
89 EX_TABLE(0b, 1b)
90 : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask)
91 : : "cc", "memory");
92 *bb = ((unsigned int) __fc) >> 31;
93 return cc;
94}
95
96static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
97{
Jan Glauber779e6e12008-07-17 17:16:48 +020098 /* all done or next buffer state different */
99 if (ccq == 0 || ccq == 32)
100 return 0;
101 /* not all buffers processed */
102 if (ccq == 96 || ccq == 97)
103 return 1;
104 /* notify devices immediately */
Jan Glauber22f99342008-12-25 13:38:46 +0100105 DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
Jan Glauber779e6e12008-07-17 17:16:48 +0200106 return -EIO;
107}
108
109/**
110 * qdio_do_eqbs - extract buffer states for QEBSM
111 * @q: queue to manipulate
112 * @state: state of the extracted buffers
113 * @start: buffer number to start at
114 * @count: count of buffers to examine
Jan Glauber50f769d2008-12-25 13:38:47 +0100115 * @auto_ack: automatically acknowledge buffers
Jan Glauber779e6e12008-07-17 17:16:48 +0200116 *
Coly Li73ac36e2009-01-07 18:09:16 -0800117 * Returns the number of successfully extracted equal buffer states.
Jan Glauber779e6e12008-07-17 17:16:48 +0200118 * Stops processing if a state is different from the last buffers state.
119 */
120static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
Jan Glauber50f769d2008-12-25 13:38:47 +0100121 int start, int count, int auto_ack)
Jan Glauber779e6e12008-07-17 17:16:48 +0200122{
123 unsigned int ccq = 0;
124 int tmp_count = count, tmp_start = start;
125 int nr = q->nr;
126 int rc;
Jan Glauber779e6e12008-07-17 17:16:48 +0200127
128 BUG_ON(!q->irq_ptr->sch_token);
Jan Glauber6486cda2010-01-04 09:05:42 +0100129 qperf_inc(q, eqbs);
Jan Glauber779e6e12008-07-17 17:16:48 +0200130
131 if (!q->is_input_q)
132 nr += q->irq_ptr->nr_input_qs;
133again:
Jan Glauber50f769d2008-12-25 13:38:47 +0100134 ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
135 auto_ack);
Jan Glauber779e6e12008-07-17 17:16:48 +0200136 rc = qdio_check_ccq(q, ccq);
137
138 /* At least one buffer was processed, return and extract the remaining
139 * buffers later.
140 */
Jan Glauber23589d02008-12-25 13:38:44 +0100141 if ((ccq == 96) && (count != tmp_count)) {
Jan Glauber6486cda2010-01-04 09:05:42 +0100142 qperf_inc(q, eqbs_partial);
Jan Glauber779e6e12008-07-17 17:16:48 +0200143 return (count - tmp_count);
Jan Glauber23589d02008-12-25 13:38:44 +0100144 }
Jan Glauber22f99342008-12-25 13:38:46 +0100145
Jan Glauber779e6e12008-07-17 17:16:48 +0200146 if (rc == 1) {
Jan Glauber22f99342008-12-25 13:38:46 +0100147 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
Jan Glauber779e6e12008-07-17 17:16:48 +0200148 goto again;
149 }
150
151 if (rc < 0) {
Jan Glauber22f99342008-12-25 13:38:46 +0100152 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
153 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
Jan Glauber779e6e12008-07-17 17:16:48 +0200154 q->handler(q->irq_ptr->cdev,
155 QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
156 0, -1, -1, q->irq_ptr->int_parm);
157 return 0;
158 }
159 return count - tmp_count;
160}
161
162/**
163 * qdio_do_sqbs - set buffer states for QEBSM
164 * @q: queue to manipulate
165 * @state: new state of the buffers
166 * @start: first buffer number to change
167 * @count: how many buffers to change
168 *
169 * Returns the number of successfully changed buffers.
170 * Does retrying until the specified count of buffer states is set or an
171 * error occurs.
172 */
173static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
174 int count)
175{
176 unsigned int ccq = 0;
177 int tmp_count = count, tmp_start = start;
178 int nr = q->nr;
179 int rc;
Jan Glauber779e6e12008-07-17 17:16:48 +0200180
Jan Glauber50f769d2008-12-25 13:38:47 +0100181 if (!count)
182 return 0;
183
Jan Glauber779e6e12008-07-17 17:16:48 +0200184 BUG_ON(!q->irq_ptr->sch_token);
Jan Glauber6486cda2010-01-04 09:05:42 +0100185 qperf_inc(q, sqbs);
Jan Glauber779e6e12008-07-17 17:16:48 +0200186
187 if (!q->is_input_q)
188 nr += q->irq_ptr->nr_input_qs;
189again:
190 ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
191 rc = qdio_check_ccq(q, ccq);
192 if (rc == 1) {
Jan Glauber22f99342008-12-25 13:38:46 +0100193 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
Jan Glauber6486cda2010-01-04 09:05:42 +0100194 qperf_inc(q, sqbs_partial);
Jan Glauber779e6e12008-07-17 17:16:48 +0200195 goto again;
196 }
197 if (rc < 0) {
Jan Glauber22f99342008-12-25 13:38:46 +0100198 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
199 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
Jan Glauber779e6e12008-07-17 17:16:48 +0200200 q->handler(q->irq_ptr->cdev,
201 QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
202 0, -1, -1, q->irq_ptr->int_parm);
203 return 0;
204 }
205 WARN_ON(tmp_count);
206 return count - tmp_count;
207}
208
209/* returns number of examined buffers and their common state in *state */
210static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
Jan Glauber50f769d2008-12-25 13:38:47 +0100211 unsigned char *state, unsigned int count,
212 int auto_ack)
Jan Glauber779e6e12008-07-17 17:16:48 +0200213{
214 unsigned char __state = 0;
215 int i;
216
217 BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
218 BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
219
220 if (is_qebsm(q))
Jan Glauber50f769d2008-12-25 13:38:47 +0100221 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
Jan Glauber779e6e12008-07-17 17:16:48 +0200222
223 for (i = 0; i < count; i++) {
224 if (!__state)
225 __state = q->slsb.val[bufnr];
226 else if (q->slsb.val[bufnr] != __state)
227 break;
228 bufnr = next_buf(bufnr);
229 }
230 *state = __state;
231 return i;
232}
233
Jan Glauber60b5df22009-06-22 12:08:10 +0200234static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
235 unsigned char *state, int auto_ack)
Jan Glauber779e6e12008-07-17 17:16:48 +0200236{
Jan Glauber50f769d2008-12-25 13:38:47 +0100237 return get_buf_states(q, bufnr, state, 1, auto_ack);
Jan Glauber779e6e12008-07-17 17:16:48 +0200238}
239
240/* wrap-around safe setting of slsb states, returns number of changed buffers */
241static inline int set_buf_states(struct qdio_q *q, int bufnr,
242 unsigned char state, int count)
243{
244 int i;
245
246 BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
247 BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
248
249 if (is_qebsm(q))
250 return qdio_do_sqbs(q, state, bufnr, count);
251
252 for (i = 0; i < count; i++) {
253 xchg(&q->slsb.val[bufnr], state);
254 bufnr = next_buf(bufnr);
255 }
256 return count;
257}
258
259static inline int set_buf_state(struct qdio_q *q, int bufnr,
260 unsigned char state)
261{
262 return set_buf_states(q, bufnr, state, 1);
263}
264
265/* set slsb states to initial state */
266void qdio_init_buf_states(struct qdio_irq *irq_ptr)
267{
268 struct qdio_q *q;
269 int i;
270
271 for_each_input_queue(irq_ptr, q, i)
272 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
273 QDIO_MAX_BUFFERS_PER_Q);
274 for_each_output_queue(irq_ptr, q, i)
275 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
276 QDIO_MAX_BUFFERS_PER_Q);
277}
278
Jan Glauber60b5df22009-06-22 12:08:10 +0200279static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
Jan Glauber779e6e12008-07-17 17:16:48 +0200280 unsigned int input)
281{
282 int cc;
283
284 if (!need_siga_sync(q))
285 return 0;
286
Jan Glauber7a0b4cb2008-12-25 13:38:48 +0100287 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
Jan Glauber6486cda2010-01-04 09:05:42 +0100288 qperf_inc(q, siga_sync);
Jan Glauber779e6e12008-07-17 17:16:48 +0200289
290 cc = do_siga_sync(q->irq_ptr->schid, output, input);
Jan Glauber22f99342008-12-25 13:38:46 +0100291 if (cc)
292 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
Jan Glauber779e6e12008-07-17 17:16:48 +0200293 return cc;
294}
295
Jan Glauber60b5df22009-06-22 12:08:10 +0200296static inline int qdio_siga_sync_q(struct qdio_q *q)
Jan Glauber779e6e12008-07-17 17:16:48 +0200297{
298 if (q->is_input_q)
299 return qdio_siga_sync(q, 0, q->mask);
300 else
301 return qdio_siga_sync(q, q->mask, 0);
302}
303
304static inline int qdio_siga_sync_out(struct qdio_q *q)
305{
306 return qdio_siga_sync(q, ~0U, 0);
307}
308
309static inline int qdio_siga_sync_all(struct qdio_q *q)
310{
311 return qdio_siga_sync(q, ~0U, ~0U);
312}
313
Jan Glauber7a0b4cb2008-12-25 13:38:48 +0100314static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit)
Jan Glauber779e6e12008-07-17 17:16:48 +0200315{
Jan Glauber779e6e12008-07-17 17:16:48 +0200316 unsigned long schid;
Jan Glauber7a0b4cb2008-12-25 13:38:48 +0100317 unsigned int fc = 0;
318 u64 start_time = 0;
319 int cc;
Jan Glauber779e6e12008-07-17 17:16:48 +0200320
Jan Glauber7a0b4cb2008-12-25 13:38:48 +0100321 if (q->u.out.use_enh_siga)
Klaus-Dieter Wacker7a0f4752008-10-10 21:33:18 +0200322 fc = 3;
Jan Glauber7a0b4cb2008-12-25 13:38:48 +0100323
324 if (is_qebsm(q)) {
Jan Glauber779e6e12008-07-17 17:16:48 +0200325 schid = q->irq_ptr->sch_token;
326 fc |= 0x80;
327 }
Jan Glauber7a0b4cb2008-12-25 13:38:48 +0100328 else
329 schid = *((u32 *)&q->irq_ptr->schid);
Jan Glauber779e6e12008-07-17 17:16:48 +0200330
Jan Glauber779e6e12008-07-17 17:16:48 +0200331again:
Jan Glauber7a0b4cb2008-12-25 13:38:48 +0100332 cc = do_siga_output(schid, q->mask, busy_bit, fc);
Jan Glauber58eb27c2008-08-21 19:46:34 +0200333
Jan Glauber7a0b4cb2008-12-25 13:38:48 +0100334 /* hipersocket busy condition */
335 if (*busy_bit) {
336 WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2);
337
338 if (!start_time) {
Jan Glauber3a601bf2010-05-17 10:00:17 +0200339 start_time = get_clock();
Jan Glauber7a0b4cb2008-12-25 13:38:48 +0100340 goto again;
341 }
Jan Glauber3a601bf2010-05-17 10:00:17 +0200342 if ((get_clock() - start_time) < QDIO_BUSY_BIT_PATIENCE)
Jan Glauber779e6e12008-07-17 17:16:48 +0200343 goto again;
344 }
Jan Glauber779e6e12008-07-17 17:16:48 +0200345 return cc;
346}
347
348static inline int qdio_siga_input(struct qdio_q *q)
349{
350 int cc;
351
Jan Glauber22f99342008-12-25 13:38:46 +0100352 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
Jan Glauber6486cda2010-01-04 09:05:42 +0100353 qperf_inc(q, siga_read);
Jan Glauber779e6e12008-07-17 17:16:48 +0200354
355 cc = do_siga_input(q->irq_ptr->schid, q->mask);
356 if (cc)
Jan Glauber22f99342008-12-25 13:38:46 +0100357 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
Jan Glauber779e6e12008-07-17 17:16:48 +0200358 return cc;
359}
360
Jan Glauber60b5df22009-06-22 12:08:10 +0200361static inline void qdio_sync_after_thinint(struct qdio_q *q)
Jan Glauber779e6e12008-07-17 17:16:48 +0200362{
363 if (pci_out_supported(q)) {
364 if (need_siga_sync_thinint(q))
365 qdio_siga_sync_all(q);
366 else if (need_siga_sync_out_thinint(q))
367 qdio_siga_sync_out(q);
368 } else
369 qdio_siga_sync_q(q);
370}
371
Jan Glauber60b5df22009-06-22 12:08:10 +0200372int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
373 unsigned char *state)
374{
375 qdio_siga_sync_q(q);
376 return get_buf_states(q, bufnr, state, 1, 0);
377}
378
379static inline void qdio_stop_polling(struct qdio_q *q)
Jan Glauber779e6e12008-07-17 17:16:48 +0200380{
Jan Glauber50f769d2008-12-25 13:38:47 +0100381 if (!q->u.in.polling)
Jan Glauber779e6e12008-07-17 17:16:48 +0200382 return;
Jan Glauber50f769d2008-12-25 13:38:47 +0100383
Jan Glauber779e6e12008-07-17 17:16:48 +0200384 q->u.in.polling = 0;
Jan Glauber6486cda2010-01-04 09:05:42 +0100385 qperf_inc(q, stop_polling);
Jan Glauber779e6e12008-07-17 17:16:48 +0200386
387 /* show the card that we are not polling anymore */
Jan Glauber50f769d2008-12-25 13:38:47 +0100388 if (is_qebsm(q)) {
Jan Glaubere85dea02009-03-26 15:24:29 +0100389 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
Jan Glauber50f769d2008-12-25 13:38:47 +0100390 q->u.in.ack_count);
391 q->u.in.ack_count = 0;
392 } else
Jan Glaubere85dea02009-03-26 15:24:29 +0100393 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
Jan Glauber779e6e12008-07-17 17:16:48 +0200394}
395
Jan Glauberd3072972010-02-26 22:37:36 +0100396static inline void account_sbals(struct qdio_q *q, int count)
397{
398 int pos = 0;
399
400 q->q_stats.nr_sbal_total += count;
401 if (count == QDIO_MAX_BUFFERS_MASK) {
402 q->q_stats.nr_sbals[7]++;
403 return;
404 }
405 while (count >>= 1)
406 pos++;
407 q->q_stats.nr_sbals[pos]++;
408}
409
Jan Glauber50f769d2008-12-25 13:38:47 +0100410static void announce_buffer_error(struct qdio_q *q, int count)
Jan Glauber779e6e12008-07-17 17:16:48 +0200411{
Jan Glauber7a0b4cb2008-12-25 13:38:48 +0100412 q->qdio_error |= QDIO_ERROR_SLSB_STATE;
Jan Glauber50f769d2008-12-25 13:38:47 +0100413
414 /* special handling for no target buffer empty */
415 if ((!q->is_input_q &&
416 (q->sbal[q->first_to_check]->element[15].flags & 0xff) == 0x10)) {
Jan Glauber6486cda2010-01-04 09:05:42 +0100417 qperf_inc(q, target_full);
Jan Glauber1d7e1502009-09-22 22:58:39 +0200418 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
Jan Glauber50f769d2008-12-25 13:38:47 +0100419 q->first_to_check);
420 return;
421 }
422
Jan Glauber22f99342008-12-25 13:38:46 +0100423 DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
424 DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
Jan Glauber50f769d2008-12-25 13:38:47 +0100425 DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
Jan Glauber22f99342008-12-25 13:38:46 +0100426 DBF_ERROR("F14:%2x F15:%2x",
427 q->sbal[q->first_to_check]->element[14].flags & 0xff,
428 q->sbal[q->first_to_check]->element[15].flags & 0xff);
Jan Glauber50f769d2008-12-25 13:38:47 +0100429}
Jan Glauber779e6e12008-07-17 17:16:48 +0200430
Jan Glauber50f769d2008-12-25 13:38:47 +0100431static inline void inbound_primed(struct qdio_q *q, int count)
432{
433 int new;
434
Jan Glauber1d7e1502009-09-22 22:58:39 +0200435 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count);
Jan Glauber50f769d2008-12-25 13:38:47 +0100436
437 /* for QEBSM the ACK was already set by EQBS */
438 if (is_qebsm(q)) {
439 if (!q->u.in.polling) {
440 q->u.in.polling = 1;
441 q->u.in.ack_count = count;
Jan Glaubere85dea02009-03-26 15:24:29 +0100442 q->u.in.ack_start = q->first_to_check;
Jan Glauber50f769d2008-12-25 13:38:47 +0100443 return;
444 }
445
446 /* delete the previous ACK's */
Jan Glaubere85dea02009-03-26 15:24:29 +0100447 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
Jan Glauber50f769d2008-12-25 13:38:47 +0100448 q->u.in.ack_count);
449 q->u.in.ack_count = count;
Jan Glaubere85dea02009-03-26 15:24:29 +0100450 q->u.in.ack_start = q->first_to_check;
Jan Glauber50f769d2008-12-25 13:38:47 +0100451 return;
452 }
453
454 /*
455 * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
456 * or by the next inbound run.
457 */
458 new = add_buf(q->first_to_check, count - 1);
459 if (q->u.in.polling) {
460 /* reset the previous ACK but first set the new one */
461 set_buf_state(q, new, SLSB_P_INPUT_ACK);
Jan Glaubere85dea02009-03-26 15:24:29 +0100462 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
Jan Glauber3fdf1e12009-03-26 15:24:28 +0100463 } else {
Jan Glauber50f769d2008-12-25 13:38:47 +0100464 q->u.in.polling = 1;
Jan Glauber3fdf1e12009-03-26 15:24:28 +0100465 set_buf_state(q, new, SLSB_P_INPUT_ACK);
Jan Glauber50f769d2008-12-25 13:38:47 +0100466 }
467
Jan Glaubere85dea02009-03-26 15:24:29 +0100468 q->u.in.ack_start = new;
Jan Glauber50f769d2008-12-25 13:38:47 +0100469 count--;
470 if (!count)
471 return;
Jan Glauber6541f7b2009-09-22 22:58:40 +0200472 /* need to change ALL buffers to get more interrupts */
473 set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
Jan Glauber779e6e12008-07-17 17:16:48 +0200474}
475
476static int get_inbound_buffer_frontier(struct qdio_q *q)
477{
478 int count, stop;
479 unsigned char state;
480
481 /*
Jan Glauber779e6e12008-07-17 17:16:48 +0200482 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
483 * would return 0.
484 */
485 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
486 stop = add_buf(q->first_to_check, count);
487
Jan Glauber779e6e12008-07-17 17:16:48 +0200488 if (q->first_to_check == stop)
489 goto out;
490
Jan Glauber36e3e722009-06-22 12:08:12 +0200491 /*
492 * No siga sync here, as a PCI or we after a thin interrupt
493 * already sync'ed the queues.
494 */
Jan Glauber50f769d2008-12-25 13:38:47 +0100495 count = get_buf_states(q, q->first_to_check, &state, count, 1);
Jan Glauber779e6e12008-07-17 17:16:48 +0200496 if (!count)
497 goto out;
498
499 switch (state) {
500 case SLSB_P_INPUT_PRIMED:
Jan Glauber50f769d2008-12-25 13:38:47 +0100501 inbound_primed(q, count);
Jan Glauber779e6e12008-07-17 17:16:48 +0200502 q->first_to_check = add_buf(q->first_to_check, count);
Jan Glauber8bcd9b02009-12-18 17:43:26 +0100503 if (atomic_sub(count, &q->nr_buf_used) == 0)
Jan Glauber6486cda2010-01-04 09:05:42 +0100504 qperf_inc(q, inbound_queue_full);
Jan Glauberd3072972010-02-26 22:37:36 +0100505 if (q->irq_ptr->perf_stat_enabled)
506 account_sbals(q, count);
Jan Glauber36e3e722009-06-22 12:08:12 +0200507 break;
Jan Glauber779e6e12008-07-17 17:16:48 +0200508 case SLSB_P_INPUT_ERROR:
Jan Glauber50f769d2008-12-25 13:38:47 +0100509 announce_buffer_error(q, count);
Jan Glauber779e6e12008-07-17 17:16:48 +0200510 /* process the buffer, the upper layer will take care of it */
511 q->first_to_check = add_buf(q->first_to_check, count);
512 atomic_sub(count, &q->nr_buf_used);
Jan Glauberd3072972010-02-26 22:37:36 +0100513 if (q->irq_ptr->perf_stat_enabled)
514 account_sbals_error(q, count);
Jan Glauber779e6e12008-07-17 17:16:48 +0200515 break;
516 case SLSB_CU_INPUT_EMPTY:
517 case SLSB_P_INPUT_NOT_INIT:
518 case SLSB_P_INPUT_ACK:
Jan Glauberd3072972010-02-26 22:37:36 +0100519 if (q->irq_ptr->perf_stat_enabled)
520 q->q_stats.nr_sbal_nop++;
Jan Glauber22f99342008-12-25 13:38:46 +0100521 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
Jan Glauber779e6e12008-07-17 17:16:48 +0200522 break;
523 default:
524 BUG();
525 }
526out:
Jan Glauber779e6e12008-07-17 17:16:48 +0200527 return q->first_to_check;
528}
529
Jan Glauber60b5df22009-06-22 12:08:10 +0200530static int qdio_inbound_q_moved(struct qdio_q *q)
Jan Glauber779e6e12008-07-17 17:16:48 +0200531{
532 int bufnr;
533
534 bufnr = get_inbound_buffer_frontier(q);
535
Jan Glaubere85dea02009-03-26 15:24:29 +0100536 if ((bufnr != q->last_move) || q->qdio_error) {
537 q->last_move = bufnr;
Martin Schwidefsky27d71602010-02-26 22:37:38 +0100538 if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
Jan Glauber3a601bf2010-05-17 10:00:17 +0200539 q->u.in.timestamp = get_clock();
Jan Glauber779e6e12008-07-17 17:16:48 +0200540 return 1;
541 } else
542 return 0;
543}
544
Jan Glauber9a2c1602009-06-22 12:08:11 +0200545static inline int qdio_inbound_q_done(struct qdio_q *q)
Jan Glauber60b5df22009-06-22 12:08:10 +0200546{
547 unsigned char state = 0;
548
549 if (!atomic_read(&q->nr_buf_used))
550 return 1;
551
552 qdio_siga_sync_q(q);
553 get_buf_state(q, q->first_to_check, &state, 0);
554
Ursula Braun4c522282010-02-09 09:46:07 +0100555 if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
Jan Glauber60b5df22009-06-22 12:08:10 +0200556 /* more work coming */
557 return 0;
Jan Glauber9a2c1602009-06-22 12:08:11 +0200558
559 if (is_thinint_irq(q->irq_ptr))
560 return 1;
561
562 /* don't poll under z/VM */
563 if (MACHINE_IS_VM)
564 return 1;
565
566 /*
567 * At this point we know, that inbound first_to_check
568 * has (probably) not moved (see qdio_inbound_processing).
569 */
Jan Glauber3a601bf2010-05-17 10:00:17 +0200570 if (get_clock() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
Jan Glauber1d7e1502009-09-22 22:58:39 +0200571 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
Jan Glauber9a2c1602009-06-22 12:08:11 +0200572 q->first_to_check);
573 return 1;
574 } else
575 return 0;
Jan Glauber60b5df22009-06-22 12:08:10 +0200576}
577
578static void qdio_kick_handler(struct qdio_q *q)
Jan Glauber779e6e12008-07-17 17:16:48 +0200579{
Jan Glauber9c8a08d2009-03-26 15:24:32 +0100580 int start = q->first_to_kick;
581 int end = q->first_to_check;
582 int count;
Jan Glauber779e6e12008-07-17 17:16:48 +0200583
584 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
585 return;
586
Jan Glauber9c8a08d2009-03-26 15:24:32 +0100587 count = sub_buf(end, start);
588
589 if (q->is_input_q) {
Jan Glauber6486cda2010-01-04 09:05:42 +0100590 qperf_inc(q, inbound_handler);
Jan Glauber1d7e1502009-09-22 22:58:39 +0200591 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
Ursula Braunbd6e8a12010-03-08 12:25:18 +0100592 } else {
Jan Glauber6486cda2010-01-04 09:05:42 +0100593 qperf_inc(q, outbound_handler);
Jan Glauber1d7e1502009-09-22 22:58:39 +0200594 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
595 start, count);
Ursula Braunbd6e8a12010-03-08 12:25:18 +0100596 }
Jan Glauber9c8a08d2009-03-26 15:24:32 +0100597
598 q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
599 q->irq_ptr->int_parm);
Jan Glauber779e6e12008-07-17 17:16:48 +0200600
601 /* for the next time */
Jan Glauber9c8a08d2009-03-26 15:24:32 +0100602 q->first_to_kick = end;
Jan Glauber779e6e12008-07-17 17:16:48 +0200603 q->qdio_error = 0;
604}
605
606static void __qdio_inbound_processing(struct qdio_q *q)
607{
Jan Glauber6486cda2010-01-04 09:05:42 +0100608 qperf_inc(q, tasklet_inbound);
Jan Glauberf3eb20f2010-05-17 10:00:15 +0200609
Jan Glauber779e6e12008-07-17 17:16:48 +0200610 if (!qdio_inbound_q_moved(q))
611 return;
612
Jan Glauber9c8a08d2009-03-26 15:24:32 +0100613 qdio_kick_handler(q);
Jan Glauber779e6e12008-07-17 17:16:48 +0200614
Jan Glauber6486cda2010-01-04 09:05:42 +0100615 if (!qdio_inbound_q_done(q)) {
Jan Glauber779e6e12008-07-17 17:16:48 +0200616 /* means poll time is not yet over */
Jan Glauber6486cda2010-01-04 09:05:42 +0100617 qperf_inc(q, tasklet_inbound_resched);
Jan Glauberf3eb20f2010-05-17 10:00:15 +0200618 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
619 tasklet_schedule(&q->tasklet);
620 return;
621 }
Jan Glauber6486cda2010-01-04 09:05:42 +0100622 }
Jan Glauber779e6e12008-07-17 17:16:48 +0200623
624 qdio_stop_polling(q);
625 /*
626 * We need to check again to not lose initiative after
627 * resetting the ACK state.
628 */
Jan Glauber6486cda2010-01-04 09:05:42 +0100629 if (!qdio_inbound_q_done(q)) {
630 qperf_inc(q, tasklet_inbound_resched2);
Jan Glauberf3eb20f2010-05-17 10:00:15 +0200631 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
632 tasklet_schedule(&q->tasklet);
Jan Glauber6486cda2010-01-04 09:05:42 +0100633 }
Jan Glauber779e6e12008-07-17 17:16:48 +0200634}
635
Jan Glauber779e6e12008-07-17 17:16:48 +0200636void qdio_inbound_processing(unsigned long data)
637{
638 struct qdio_q *q = (struct qdio_q *)data;
639 __qdio_inbound_processing(q);
640}
641
642static int get_outbound_buffer_frontier(struct qdio_q *q)
643{
644 int count, stop;
645 unsigned char state;
646
647 if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) ||
648 (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q)))
649 qdio_siga_sync_q(q);
650
651 /*
652 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
653 * would return 0.
654 */
655 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
656 stop = add_buf(q->first_to_check, count);
657
Jan Glauber779e6e12008-07-17 17:16:48 +0200658 if (q->first_to_check == stop)
659 return q->first_to_check;
660
Jan Glauber50f769d2008-12-25 13:38:47 +0100661 count = get_buf_states(q, q->first_to_check, &state, count, 0);
Jan Glauber779e6e12008-07-17 17:16:48 +0200662 if (!count)
663 return q->first_to_check;
664
665 switch (state) {
666 case SLSB_P_OUTPUT_EMPTY:
667 /* the adapter got it */
Jan Glauber1d7e1502009-09-22 22:58:39 +0200668 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %02x", q->nr, count);
Jan Glauber779e6e12008-07-17 17:16:48 +0200669
670 atomic_sub(count, &q->nr_buf_used);
671 q->first_to_check = add_buf(q->first_to_check, count);
Jan Glauberd3072972010-02-26 22:37:36 +0100672 if (q->irq_ptr->perf_stat_enabled)
673 account_sbals(q, count);
Jan Glauber36e3e722009-06-22 12:08:12 +0200674 break;
Jan Glauber779e6e12008-07-17 17:16:48 +0200675 case SLSB_P_OUTPUT_ERROR:
Jan Glauber50f769d2008-12-25 13:38:47 +0100676 announce_buffer_error(q, count);
Jan Glauber779e6e12008-07-17 17:16:48 +0200677 /* process the buffer, the upper layer will take care of it */
678 q->first_to_check = add_buf(q->first_to_check, count);
679 atomic_sub(count, &q->nr_buf_used);
Jan Glauberd3072972010-02-26 22:37:36 +0100680 if (q->irq_ptr->perf_stat_enabled)
681 account_sbals_error(q, count);
Jan Glauber779e6e12008-07-17 17:16:48 +0200682 break;
683 case SLSB_CU_OUTPUT_PRIMED:
684 /* the adapter has not fetched the output yet */
Jan Glauberd3072972010-02-26 22:37:36 +0100685 if (q->irq_ptr->perf_stat_enabled)
686 q->q_stats.nr_sbal_nop++;
Jan Glauber22f99342008-12-25 13:38:46 +0100687 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr);
Jan Glauber779e6e12008-07-17 17:16:48 +0200688 break;
689 case SLSB_P_OUTPUT_NOT_INIT:
690 case SLSB_P_OUTPUT_HALTED:
691 break;
692 default:
693 BUG();
694 }
695 return q->first_to_check;
696}
697
698/* all buffers processed? */
699static inline int qdio_outbound_q_done(struct qdio_q *q)
700{
701 return atomic_read(&q->nr_buf_used) == 0;
702}
703
704static inline int qdio_outbound_q_moved(struct qdio_q *q)
705{
706 int bufnr;
707
708 bufnr = get_outbound_buffer_frontier(q);
709
Jan Glaubere85dea02009-03-26 15:24:29 +0100710 if ((bufnr != q->last_move) || q->qdio_error) {
711 q->last_move = bufnr;
Jan Glauber22f99342008-12-25 13:38:46 +0100712 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
Jan Glauber779e6e12008-07-17 17:16:48 +0200713 return 1;
714 } else
715 return 0;
716}
717
Jan Glauberd303b6f2009-03-26 15:24:31 +0100718static int qdio_kick_outbound_q(struct qdio_q *q)
Jan Glauber779e6e12008-07-17 17:16:48 +0200719{
Jan Glauber7a0b4cb2008-12-25 13:38:48 +0100720 unsigned int busy_bit;
721 int cc;
Jan Glauber779e6e12008-07-17 17:16:48 +0200722
723 if (!need_siga_out(q))
Jan Glauberd303b6f2009-03-26 15:24:31 +0100724 return 0;
Jan Glauber779e6e12008-07-17 17:16:48 +0200725
Jan Glauber7a0b4cb2008-12-25 13:38:48 +0100726 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
Jan Glauber6486cda2010-01-04 09:05:42 +0100727 qperf_inc(q, siga_write);
Jan Glauber7a0b4cb2008-12-25 13:38:48 +0100728
729 cc = qdio_siga_output(q, &busy_bit);
730 switch (cc) {
Jan Glauber779e6e12008-07-17 17:16:48 +0200731 case 0:
Jan Glauber779e6e12008-07-17 17:16:48 +0200732 break;
Jan Glauber7a0b4cb2008-12-25 13:38:48 +0100733 case 2:
734 if (busy_bit) {
735 DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr);
Jan Glauberd303b6f2009-03-26 15:24:31 +0100736 cc |= QDIO_ERROR_SIGA_BUSY;
737 } else
738 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
Jan Glauber7a0b4cb2008-12-25 13:38:48 +0100739 break;
740 case 1:
741 case 3:
742 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
Jan Glauber7a0b4cb2008-12-25 13:38:48 +0100743 break;
Jan Glauber779e6e12008-07-17 17:16:48 +0200744 }
Jan Glauberd303b6f2009-03-26 15:24:31 +0100745 return cc;
Jan Glauber779e6e12008-07-17 17:16:48 +0200746}
747
Jan Glauber779e6e12008-07-17 17:16:48 +0200748static void __qdio_outbound_processing(struct qdio_q *q)
749{
Jan Glauber6486cda2010-01-04 09:05:42 +0100750 qperf_inc(q, tasklet_outbound);
Jan Glauber779e6e12008-07-17 17:16:48 +0200751 BUG_ON(atomic_read(&q->nr_buf_used) < 0);
752
753 if (qdio_outbound_q_moved(q))
Jan Glauber9c8a08d2009-03-26 15:24:32 +0100754 qdio_kick_handler(q);
Jan Glauber779e6e12008-07-17 17:16:48 +0200755
Jan Glauberc38f9602009-03-26 15:24:26 +0100756 if (queue_type(q) == QDIO_ZFCP_QFMT)
Jan Glauber779e6e12008-07-17 17:16:48 +0200757 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
Jan Glauberc38f9602009-03-26 15:24:26 +0100758 goto sched;
Jan Glauber779e6e12008-07-17 17:16:48 +0200759
760 /* bail out for HiperSockets unicast queues */
761 if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
762 return;
763
Ursula Braun4bcb3a32008-10-10 21:33:04 +0200764 if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
Jan Glauberc38f9602009-03-26 15:24:26 +0100765 (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL)
766 goto sched;
Ursula Braun4bcb3a32008-10-10 21:33:04 +0200767
Jan Glauber779e6e12008-07-17 17:16:48 +0200768 if (q->u.out.pci_out_enabled)
769 return;
770
771 /*
772 * Now we know that queue type is either qeth without pci enabled
773 * or HiperSockets multicast. Make sure buffer switch from PRIMED to
774 * EMPTY is noticed and outbound_handler is called after some time.
775 */
776 if (qdio_outbound_q_done(q))
777 del_timer(&q->u.out.timer);
Jan Glauber6486cda2010-01-04 09:05:42 +0100778 else
779 if (!timer_pending(&q->u.out.timer))
Jan Glauber779e6e12008-07-17 17:16:48 +0200780 mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
Jan Glauberc38f9602009-03-26 15:24:26 +0100781 return;
782
783sched:
784 if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
785 return;
786 tasklet_schedule(&q->tasklet);
Jan Glauber779e6e12008-07-17 17:16:48 +0200787}
788
789/* outbound tasklet */
790void qdio_outbound_processing(unsigned long data)
791{
792 struct qdio_q *q = (struct qdio_q *)data;
793 __qdio_outbound_processing(q);
794}
795
796void qdio_outbound_timer(unsigned long data)
797{
798 struct qdio_q *q = (struct qdio_q *)data;
Jan Glauberc38f9602009-03-26 15:24:26 +0100799
800 if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
801 return;
Jan Glauber779e6e12008-07-17 17:16:48 +0200802 tasklet_schedule(&q->tasklet);
803}
804
Jan Glauber60b5df22009-06-22 12:08:10 +0200805static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
Jan Glauber779e6e12008-07-17 17:16:48 +0200806{
807 struct qdio_q *out;
808 int i;
809
810 if (!pci_out_supported(q))
811 return;
812
813 for_each_output_queue(q->irq_ptr, out, i)
814 if (!qdio_outbound_q_done(out))
815 tasklet_schedule(&out->tasklet);
816}
817
Jan Glauber60b5df22009-06-22 12:08:10 +0200818static void __tiqdio_inbound_processing(struct qdio_q *q)
819{
Jan Glauber6486cda2010-01-04 09:05:42 +0100820 qperf_inc(q, tasklet_inbound);
Jan Glauber60b5df22009-06-22 12:08:10 +0200821 qdio_sync_after_thinint(q);
822
823 /*
824 * The interrupt could be caused by a PCI request. Check the
825 * PCI capable outbound queues.
826 */
827 qdio_check_outbound_after_thinint(q);
828
829 if (!qdio_inbound_q_moved(q))
830 return;
831
832 qdio_kick_handler(q);
833
Jan Glauber9a2c1602009-06-22 12:08:11 +0200834 if (!qdio_inbound_q_done(q)) {
Jan Glauber6486cda2010-01-04 09:05:42 +0100835 qperf_inc(q, tasklet_inbound_resched);
Jan Glaubere2910bc2009-09-11 10:28:19 +0200836 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
Jan Glauber60b5df22009-06-22 12:08:10 +0200837 tasklet_schedule(&q->tasklet);
Jan Glaubere2910bc2009-09-11 10:28:19 +0200838 return;
839 }
Jan Glauber60b5df22009-06-22 12:08:10 +0200840 }
841
842 qdio_stop_polling(q);
843 /*
844 * We need to check again to not lose initiative after
845 * resetting the ACK state.
846 */
Jan Glauber9a2c1602009-06-22 12:08:11 +0200847 if (!qdio_inbound_q_done(q)) {
Jan Glauber6486cda2010-01-04 09:05:42 +0100848 qperf_inc(q, tasklet_inbound_resched2);
Jan Glauber60b5df22009-06-22 12:08:10 +0200849 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
850 tasklet_schedule(&q->tasklet);
851 }
852}
853
854void tiqdio_inbound_processing(unsigned long data)
855{
856 struct qdio_q *q = (struct qdio_q *)data;
857 __tiqdio_inbound_processing(q);
858}
859
Jan Glauber779e6e12008-07-17 17:16:48 +0200860static inline void qdio_set_state(struct qdio_irq *irq_ptr,
861 enum qdio_irq_states state)
862{
Jan Glauber22f99342008-12-25 13:38:46 +0100863 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
Jan Glauber779e6e12008-07-17 17:16:48 +0200864
865 irq_ptr->state = state;
866 mb();
867}
868
Jan Glauber22f99342008-12-25 13:38:46 +0100869static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
Jan Glauber779e6e12008-07-17 17:16:48 +0200870{
Jan Glauber779e6e12008-07-17 17:16:48 +0200871 if (irb->esw.esw0.erw.cons) {
Jan Glauber22f99342008-12-25 13:38:46 +0100872 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
873 DBF_ERROR_HEX(irb, 64);
874 DBF_ERROR_HEX(irb->ecw, 64);
Jan Glauber779e6e12008-07-17 17:16:48 +0200875 }
876}
877
878/* PCI interrupt handler */
879static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
880{
881 int i;
882 struct qdio_q *q;
883
Jan Glauberc38f9602009-03-26 15:24:26 +0100884 if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
885 return;
886
Jan Glauberd36deae2010-09-07 21:14:39 +0000887 for_each_input_queue(irq_ptr, q, i) {
888 if (q->u.in.queue_start_poll) {
889 /* skip if polling is enabled or already in work */
890 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
891 &q->u.in.queue_irq_state)) {
892 qperf_inc(q, int_discarded);
893 continue;
894 }
895 q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
896 q->irq_ptr->int_parm);
897 } else
898 tasklet_schedule(&q->tasklet);
899 }
Jan Glauber779e6e12008-07-17 17:16:48 +0200900
901 if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
902 return;
903
904 for_each_output_queue(irq_ptr, q, i) {
905 if (qdio_outbound_q_done(q))
906 continue;
907
908 if (!siga_syncs_out_pci(q))
909 qdio_siga_sync_q(q);
910
911 tasklet_schedule(&q->tasklet);
912 }
913}
914
915static void qdio_handle_activate_check(struct ccw_device *cdev,
916 unsigned long intparm, int cstat, int dstat)
917{
918 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
919 struct qdio_q *q;
Jan Glauber779e6e12008-07-17 17:16:48 +0200920
Jan Glauber22f99342008-12-25 13:38:46 +0100921 DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
922 DBF_ERROR("intp :%lx", intparm);
923 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
Jan Glauber779e6e12008-07-17 17:16:48 +0200924
925 if (irq_ptr->nr_input_qs) {
926 q = irq_ptr->input_qs[0];
927 } else if (irq_ptr->nr_output_qs) {
928 q = irq_ptr->output_qs[0];
929 } else {
930 dump_stack();
931 goto no_handler;
932 }
933 q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
934 0, -1, -1, irq_ptr->int_parm);
935no_handler:
936 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
937}
938
Jan Glauber779e6e12008-07-17 17:16:48 +0200939static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
940 int dstat)
941{
942 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
Jan Glauber779e6e12008-07-17 17:16:48 +0200943
Jan Glauber22f99342008-12-25 13:38:46 +0100944 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
Jan Glauber4c575422009-06-12 10:26:28 +0200945
946 if (cstat)
947 goto error;
948 if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
949 goto error;
950 if (!(dstat & DEV_STAT_DEV_END))
951 goto error;
952 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
953 return;
954
955error:
956 DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
957 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
958 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
Jan Glauber779e6e12008-07-17 17:16:48 +0200959}
960
961/* qdio interrupt handler */
962void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
963 struct irb *irb)
964{
965 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
966 int cstat, dstat;
Jan Glauber779e6e12008-07-17 17:16:48 +0200967
Jan Glauber779e6e12008-07-17 17:16:48 +0200968 if (!intparm || !irq_ptr) {
Jan Glauber22f99342008-12-25 13:38:46 +0100969 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
Jan Glauber779e6e12008-07-17 17:16:48 +0200970 return;
971 }
972
Jan Glauber09a308f2010-05-17 10:00:14 +0200973 if (irq_ptr->perf_stat_enabled)
974 irq_ptr->perf_stat.qdio_int++;
975
Jan Glauber779e6e12008-07-17 17:16:48 +0200976 if (IS_ERR(irb)) {
977 switch (PTR_ERR(irb)) {
978 case -EIO:
Jan Glauber22f99342008-12-25 13:38:46 +0100979 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
Jan Glauber75cb71f2009-04-14 15:36:22 +0200980 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
981 wake_up(&cdev->private->wait_q);
Jan Glauber779e6e12008-07-17 17:16:48 +0200982 return;
983 default:
984 WARN_ON(1);
985 return;
986 }
987 }
Jan Glauber22f99342008-12-25 13:38:46 +0100988 qdio_irq_check_sense(irq_ptr, irb);
Jan Glauber779e6e12008-07-17 17:16:48 +0200989 cstat = irb->scsw.cmd.cstat;
990 dstat = irb->scsw.cmd.dstat;
991
992 switch (irq_ptr->state) {
993 case QDIO_IRQ_STATE_INACTIVE:
994 qdio_establish_handle_irq(cdev, cstat, dstat);
995 break;
Jan Glauber779e6e12008-07-17 17:16:48 +0200996 case QDIO_IRQ_STATE_CLEANUP:
997 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
998 break;
Jan Glauber779e6e12008-07-17 17:16:48 +0200999 case QDIO_IRQ_STATE_ESTABLISHED:
1000 case QDIO_IRQ_STATE_ACTIVE:
1001 if (cstat & SCHN_STAT_PCI) {
1002 qdio_int_handler_pci(irq_ptr);
Jan Glauber779e6e12008-07-17 17:16:48 +02001003 return;
1004 }
Jan Glauber4c575422009-06-12 10:26:28 +02001005 if (cstat || dstat)
Jan Glauber779e6e12008-07-17 17:16:48 +02001006 qdio_handle_activate_check(cdev, intparm, cstat,
1007 dstat);
Jan Glauber4c575422009-06-12 10:26:28 +02001008 break;
Jan Glauber959153d2010-02-09 09:46:08 +01001009 case QDIO_IRQ_STATE_STOPPED:
1010 break;
Jan Glauber779e6e12008-07-17 17:16:48 +02001011 default:
1012 WARN_ON(1);
1013 }
1014 wake_up(&cdev->private->wait_q);
1015}
1016
1017/**
1018 * qdio_get_ssqd_desc - get qdio subchannel description
1019 * @cdev: ccw device to get description for
Jan Glauberbbd50e12008-12-25 13:38:43 +01001020 * @data: where to store the ssqd
Jan Glauber779e6e12008-07-17 17:16:48 +02001021 *
Jan Glauberbbd50e12008-12-25 13:38:43 +01001022 * Returns 0 or an error code. The results of the chsc are stored in the
1023 * specified structure.
Jan Glauber779e6e12008-07-17 17:16:48 +02001024 */
Jan Glauberbbd50e12008-12-25 13:38:43 +01001025int qdio_get_ssqd_desc(struct ccw_device *cdev,
1026 struct qdio_ssqd_desc *data)
Jan Glauber779e6e12008-07-17 17:16:48 +02001027{
Jan Glauber779e6e12008-07-17 17:16:48 +02001028
Jan Glauberbbd50e12008-12-25 13:38:43 +01001029 if (!cdev || !cdev->private)
1030 return -EINVAL;
1031
Jan Glauber22f99342008-12-25 13:38:46 +01001032 DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
Jan Glauberbbd50e12008-12-25 13:38:43 +01001033 return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
Jan Glauber779e6e12008-07-17 17:16:48 +02001034}
1035EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1036
Jan Glauber779e6e12008-07-17 17:16:48 +02001037static void qdio_shutdown_queues(struct ccw_device *cdev)
1038{
1039 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1040 struct qdio_q *q;
1041 int i;
1042
1043 for_each_input_queue(irq_ptr, q, i)
Jan Glauberc38f9602009-03-26 15:24:26 +01001044 tasklet_kill(&q->tasklet);
Jan Glauber779e6e12008-07-17 17:16:48 +02001045
1046 for_each_output_queue(irq_ptr, q, i) {
Jan Glauber779e6e12008-07-17 17:16:48 +02001047 del_timer(&q->u.out.timer);
Jan Glauberc38f9602009-03-26 15:24:26 +01001048 tasklet_kill(&q->tasklet);
Jan Glauber779e6e12008-07-17 17:16:48 +02001049 }
1050}
1051
1052/**
1053 * qdio_shutdown - shut down a qdio subchannel
1054 * @cdev: associated ccw device
1055 * @how: use halt or clear to shutdown
1056 */
1057int qdio_shutdown(struct ccw_device *cdev, int how)
1058{
Jan Glauber22f99342008-12-25 13:38:46 +01001059 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
Jan Glauber779e6e12008-07-17 17:16:48 +02001060 int rc;
1061 unsigned long flags;
Jan Glauber779e6e12008-07-17 17:16:48 +02001062
Jan Glauber779e6e12008-07-17 17:16:48 +02001063 if (!irq_ptr)
1064 return -ENODEV;
1065
Jan Glauberb4547402009-03-26 15:24:24 +01001066 BUG_ON(irqs_disabled());
Jan Glauber22f99342008-12-25 13:38:46 +01001067 DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1068
Jan Glauber779e6e12008-07-17 17:16:48 +02001069 mutex_lock(&irq_ptr->setup_mutex);
1070 /*
1071 * Subchannel was already shot down. We cannot prevent being called
1072 * twice since cio may trigger a shutdown asynchronously.
1073 */
1074 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1075 mutex_unlock(&irq_ptr->setup_mutex);
1076 return 0;
1077 }
1078
Jan Glauberc38f9602009-03-26 15:24:26 +01001079 /*
1080 * Indicate that the device is going down. Scheduling the queue
1081 * tasklets is forbidden from here on.
1082 */
1083 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1084
Jan Glauber779e6e12008-07-17 17:16:48 +02001085 tiqdio_remove_input_queues(irq_ptr);
1086 qdio_shutdown_queues(cdev);
1087 qdio_shutdown_debug_entries(irq_ptr, cdev);
1088
1089 /* cleanup subchannel */
1090 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1091
1092 if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1093 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1094 else
1095 /* default behaviour is halt */
1096 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1097 if (rc) {
Jan Glauber22f99342008-12-25 13:38:46 +01001098 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1099 DBF_ERROR("rc:%4d", rc);
Jan Glauber779e6e12008-07-17 17:16:48 +02001100 goto no_cleanup;
1101 }
1102
1103 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1104 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1105 wait_event_interruptible_timeout(cdev->private->wait_q,
1106 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1107 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1108 10 * HZ);
1109 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1110
1111no_cleanup:
1112 qdio_shutdown_thinint(irq_ptr);
1113
1114 /* restore interrupt handler */
1115 if ((void *)cdev->handler == (void *)qdio_int_handler)
1116 cdev->handler = irq_ptr->orig_handler;
1117 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1118
1119 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1120 mutex_unlock(&irq_ptr->setup_mutex);
Jan Glauber779e6e12008-07-17 17:16:48 +02001121 if (rc)
1122 return rc;
1123 return 0;
1124}
1125EXPORT_SYMBOL_GPL(qdio_shutdown);
1126
1127/**
1128 * qdio_free - free data structures for a qdio subchannel
1129 * @cdev: associated ccw device
1130 */
1131int qdio_free(struct ccw_device *cdev)
1132{
Jan Glauber22f99342008-12-25 13:38:46 +01001133 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
Jan Glauber779e6e12008-07-17 17:16:48 +02001134
Jan Glauber779e6e12008-07-17 17:16:48 +02001135 if (!irq_ptr)
1136 return -ENODEV;
1137
Jan Glauber22f99342008-12-25 13:38:46 +01001138 DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
Jan Glauber779e6e12008-07-17 17:16:48 +02001139 mutex_lock(&irq_ptr->setup_mutex);
Jan Glauber22f99342008-12-25 13:38:46 +01001140
1141 if (irq_ptr->debug_area != NULL) {
1142 debug_unregister(irq_ptr->debug_area);
1143 irq_ptr->debug_area = NULL;
1144 }
Jan Glauber779e6e12008-07-17 17:16:48 +02001145 cdev->private->qdio_data = NULL;
1146 mutex_unlock(&irq_ptr->setup_mutex);
1147
1148 qdio_release_memory(irq_ptr);
1149 return 0;
1150}
1151EXPORT_SYMBOL_GPL(qdio_free);
1152
1153/**
Jan Glauber779e6e12008-07-17 17:16:48 +02001154 * qdio_allocate - allocate qdio queues and associated data
1155 * @init_data: initialization data
1156 */
1157int qdio_allocate(struct qdio_initialize *init_data)
1158{
1159 struct qdio_irq *irq_ptr;
Jan Glauber779e6e12008-07-17 17:16:48 +02001160
Jan Glauber22f99342008-12-25 13:38:46 +01001161 DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
Jan Glauber779e6e12008-07-17 17:16:48 +02001162
1163 if ((init_data->no_input_qs && !init_data->input_handler) ||
1164 (init_data->no_output_qs && !init_data->output_handler))
1165 return -EINVAL;
1166
1167 if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1168 (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1169 return -EINVAL;
1170
1171 if ((!init_data->input_sbal_addr_array) ||
1172 (!init_data->output_sbal_addr_array))
1173 return -EINVAL;
1174
Jan Glauber779e6e12008-07-17 17:16:48 +02001175 /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1176 irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1177 if (!irq_ptr)
1178 goto out_err;
Jan Glauber779e6e12008-07-17 17:16:48 +02001179
1180 mutex_init(&irq_ptr->setup_mutex);
Jan Glauber22f99342008-12-25 13:38:46 +01001181 qdio_allocate_dbf(init_data, irq_ptr);
Jan Glauber779e6e12008-07-17 17:16:48 +02001182
1183 /*
1184 * Allocate a page for the chsc calls in qdio_establish.
1185 * Must be pre-allocated since a zfcp recovery will call
1186 * qdio_establish. In case of low memory and swap on a zfcp disk
1187 * we may not be able to allocate memory otherwise.
1188 */
1189 irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1190 if (!irq_ptr->chsc_page)
1191 goto out_rel;
1192
1193 /* qdr is used in ccw1.cda which is u32 */
Jan Glauber3b8e3002008-08-01 16:39:17 +02001194 irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
Jan Glauber779e6e12008-07-17 17:16:48 +02001195 if (!irq_ptr->qdr)
1196 goto out_rel;
1197 WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1198
Jan Glauber779e6e12008-07-17 17:16:48 +02001199 if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1200 init_data->no_output_qs))
1201 goto out_rel;
1202
1203 init_data->cdev->private->qdio_data = irq_ptr;
1204 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1205 return 0;
1206out_rel:
1207 qdio_release_memory(irq_ptr);
1208out_err:
1209 return -ENOMEM;
1210}
1211EXPORT_SYMBOL_GPL(qdio_allocate);
1212
1213/**
1214 * qdio_establish - establish queues on a qdio subchannel
1215 * @init_data: initialization data
1216 */
1217int qdio_establish(struct qdio_initialize *init_data)
1218{
Jan Glauber779e6e12008-07-17 17:16:48 +02001219 struct qdio_irq *irq_ptr;
1220 struct ccw_device *cdev = init_data->cdev;
1221 unsigned long saveflags;
1222 int rc;
1223
Jan Glauber22f99342008-12-25 13:38:46 +01001224 DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
Jan Glauber58eb27c2008-08-21 19:46:34 +02001225
Jan Glauber779e6e12008-07-17 17:16:48 +02001226 irq_ptr = cdev->private->qdio_data;
1227 if (!irq_ptr)
1228 return -ENODEV;
1229
1230 if (cdev->private->state != DEV_STATE_ONLINE)
1231 return -EINVAL;
1232
Jan Glauber779e6e12008-07-17 17:16:48 +02001233 mutex_lock(&irq_ptr->setup_mutex);
1234 qdio_setup_irq(init_data);
1235
1236 rc = qdio_establish_thinint(irq_ptr);
1237 if (rc) {
1238 mutex_unlock(&irq_ptr->setup_mutex);
1239 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1240 return rc;
1241 }
1242
1243 /* establish q */
1244 irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1245 irq_ptr->ccw.flags = CCW_FLAG_SLI;
1246 irq_ptr->ccw.count = irq_ptr->equeue.count;
1247 irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1248
1249 spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1250 ccw_device_set_options_mask(cdev, 0);
1251
1252 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1253 if (rc) {
Jan Glauber22f99342008-12-25 13:38:46 +01001254 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1255 DBF_ERROR("rc:%4x", rc);
Jan Glauber779e6e12008-07-17 17:16:48 +02001256 }
1257 spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1258
1259 if (rc) {
1260 mutex_unlock(&irq_ptr->setup_mutex);
1261 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1262 return rc;
1263 }
1264
1265 wait_event_interruptible_timeout(cdev->private->wait_q,
1266 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1267 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1268
1269 if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1270 mutex_unlock(&irq_ptr->setup_mutex);
1271 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1272 return -EIO;
1273 }
1274
1275 qdio_setup_ssqd_info(irq_ptr);
Jan Glauber22f99342008-12-25 13:38:46 +01001276 DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc);
1277 DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac);
Jan Glauber779e6e12008-07-17 17:16:48 +02001278
1279 /* qebsm is now setup if available, initialize buffer states */
1280 qdio_init_buf_states(irq_ptr);
1281
1282 mutex_unlock(&irq_ptr->setup_mutex);
1283 qdio_print_subchannel_info(irq_ptr, cdev);
1284 qdio_setup_debug_entries(irq_ptr, cdev);
1285 return 0;
1286}
1287EXPORT_SYMBOL_GPL(qdio_establish);
1288
1289/**
1290 * qdio_activate - activate queues on a qdio subchannel
1291 * @cdev: associated cdev
1292 */
1293int qdio_activate(struct ccw_device *cdev)
1294{
1295 struct qdio_irq *irq_ptr;
1296 int rc;
1297 unsigned long saveflags;
Jan Glauber779e6e12008-07-17 17:16:48 +02001298
Jan Glauber22f99342008-12-25 13:38:46 +01001299 DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
Jan Glauber58eb27c2008-08-21 19:46:34 +02001300
Jan Glauber779e6e12008-07-17 17:16:48 +02001301 irq_ptr = cdev->private->qdio_data;
1302 if (!irq_ptr)
1303 return -ENODEV;
1304
1305 if (cdev->private->state != DEV_STATE_ONLINE)
1306 return -EINVAL;
1307
1308 mutex_lock(&irq_ptr->setup_mutex);
1309 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1310 rc = -EBUSY;
1311 goto out;
1312 }
1313
Jan Glauber779e6e12008-07-17 17:16:48 +02001314 irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1315 irq_ptr->ccw.flags = CCW_FLAG_SLI;
1316 irq_ptr->ccw.count = irq_ptr->aqueue.count;
1317 irq_ptr->ccw.cda = 0;
1318
1319 spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1320 ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1321
1322 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1323 0, DOIO_DENY_PREFETCH);
1324 if (rc) {
Jan Glauber22f99342008-12-25 13:38:46 +01001325 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1326 DBF_ERROR("rc:%4x", rc);
Jan Glauber779e6e12008-07-17 17:16:48 +02001327 }
1328 spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1329
1330 if (rc)
1331 goto out;
1332
1333 if (is_thinint_irq(irq_ptr))
1334 tiqdio_add_input_queues(irq_ptr);
1335
1336 /* wait for subchannel to become active */
1337 msleep(5);
1338
1339 switch (irq_ptr->state) {
1340 case QDIO_IRQ_STATE_STOPPED:
1341 case QDIO_IRQ_STATE_ERR:
Jan Glaubere4c14e22009-03-26 15:24:25 +01001342 rc = -EIO;
1343 break;
Jan Glauber779e6e12008-07-17 17:16:48 +02001344 default:
1345 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1346 rc = 0;
1347 }
1348out:
1349 mutex_unlock(&irq_ptr->setup_mutex);
1350 return rc;
1351}
1352EXPORT_SYMBOL_GPL(qdio_activate);
1353
1354static inline int buf_in_between(int bufnr, int start, int count)
1355{
1356 int end = add_buf(start, count);
1357
1358 if (end > start) {
1359 if (bufnr >= start && bufnr < end)
1360 return 1;
1361 else
1362 return 0;
1363 }
1364
1365 /* wrap-around case */
1366 if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1367 (bufnr < end))
1368 return 1;
1369 else
1370 return 0;
1371}
1372
1373/**
1374 * handle_inbound - reset processed input buffers
1375 * @q: queue containing the buffers
1376 * @callflags: flags
1377 * @bufnr: first buffer to process
1378 * @count: how many buffers are emptied
1379 */
Jan Glauberd303b6f2009-03-26 15:24:31 +01001380static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1381 int bufnr, int count)
Jan Glauber779e6e12008-07-17 17:16:48 +02001382{
Jan Glauberd303b6f2009-03-26 15:24:31 +01001383 int used, diff;
Jan Glauber779e6e12008-07-17 17:16:48 +02001384
Jan Glauber6486cda2010-01-04 09:05:42 +01001385 qperf_inc(q, inbound_call);
1386
Jan Glauber50f769d2008-12-25 13:38:47 +01001387 if (!q->u.in.polling)
1388 goto set;
1389
1390 /* protect against stop polling setting an ACK for an emptied slsb */
1391 if (count == QDIO_MAX_BUFFERS_PER_Q) {
1392 /* overwriting everything, just delete polling status */
1393 q->u.in.polling = 0;
1394 q->u.in.ack_count = 0;
1395 goto set;
Jan Glaubere85dea02009-03-26 15:24:29 +01001396 } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
Jan Glauber50f769d2008-12-25 13:38:47 +01001397 if (is_qebsm(q)) {
Jan Glaubere85dea02009-03-26 15:24:29 +01001398 /* partial overwrite, just update ack_start */
Jan Glauber50f769d2008-12-25 13:38:47 +01001399 diff = add_buf(bufnr, count);
Jan Glaubere85dea02009-03-26 15:24:29 +01001400 diff = sub_buf(diff, q->u.in.ack_start);
Jan Glauber50f769d2008-12-25 13:38:47 +01001401 q->u.in.ack_count -= diff;
1402 if (q->u.in.ack_count <= 0) {
1403 q->u.in.polling = 0;
1404 q->u.in.ack_count = 0;
Jan Glauber50f769d2008-12-25 13:38:47 +01001405 goto set;
1406 }
Jan Glaubere85dea02009-03-26 15:24:29 +01001407 q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
Jan Glauber50f769d2008-12-25 13:38:47 +01001408 }
1409 else
1410 /* the only ACK will be deleted, so stop polling */
Jan Glauber779e6e12008-07-17 17:16:48 +02001411 q->u.in.polling = 0;
Jan Glauber50f769d2008-12-25 13:38:47 +01001412 }
Jan Glauber779e6e12008-07-17 17:16:48 +02001413
Jan Glauber50f769d2008-12-25 13:38:47 +01001414set:
Jan Glauber779e6e12008-07-17 17:16:48 +02001415 count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
Jan Glauber779e6e12008-07-17 17:16:48 +02001416
1417 used = atomic_add_return(count, &q->nr_buf_used) - count;
1418 BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1419
1420 /* no need to signal as long as the adapter had free buffers */
1421 if (used)
Jan Glauberd303b6f2009-03-26 15:24:31 +01001422 return 0;
Jan Glauber779e6e12008-07-17 17:16:48 +02001423
Jan Glauberd303b6f2009-03-26 15:24:31 +01001424 if (need_siga_in(q))
1425 return qdio_siga_input(q);
1426 return 0;
Jan Glauber779e6e12008-07-17 17:16:48 +02001427}
1428
1429/**
1430 * handle_outbound - process filled outbound buffers
1431 * @q: queue containing the buffers
1432 * @callflags: flags
1433 * @bufnr: first buffer to process
1434 * @count: how many buffers are filled
1435 */
Jan Glauberd303b6f2009-03-26 15:24:31 +01001436static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1437 int bufnr, int count)
Jan Glauber779e6e12008-07-17 17:16:48 +02001438{
1439 unsigned char state;
Jan Glauberd303b6f2009-03-26 15:24:31 +01001440 int used, rc = 0;
Jan Glauber779e6e12008-07-17 17:16:48 +02001441
Jan Glauber6486cda2010-01-04 09:05:42 +01001442 qperf_inc(q, outbound_call);
Jan Glauber779e6e12008-07-17 17:16:48 +02001443
1444 count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1445 used = atomic_add_return(count, &q->nr_buf_used);
1446 BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1447
Jan Glauber6486cda2010-01-04 09:05:42 +01001448 if (callflags & QDIO_FLAG_PCI_OUT) {
Jan Glauber779e6e12008-07-17 17:16:48 +02001449 q->u.out.pci_out_enabled = 1;
Jan Glauber6486cda2010-01-04 09:05:42 +01001450 qperf_inc(q, pci_request_int);
1451 }
Jan Glauber779e6e12008-07-17 17:16:48 +02001452 else
1453 q->u.out.pci_out_enabled = 0;
1454
1455 if (queue_type(q) == QDIO_IQDIO_QFMT) {
1456 if (multicast_outbound(q))
Jan Glauberd303b6f2009-03-26 15:24:31 +01001457 rc = qdio_kick_outbound_q(q);
Jan Glauber779e6e12008-07-17 17:16:48 +02001458 else
Klaus-Dieter Wacker7a0f4752008-10-10 21:33:18 +02001459 if ((q->irq_ptr->ssqd_desc.mmwc > 1) &&
1460 (count > 1) &&
1461 (count <= q->irq_ptr->ssqd_desc.mmwc)) {
1462 /* exploit enhanced SIGA */
1463 q->u.out.use_enh_siga = 1;
Jan Glauberd303b6f2009-03-26 15:24:31 +01001464 rc = qdio_kick_outbound_q(q);
Klaus-Dieter Wacker7a0f4752008-10-10 21:33:18 +02001465 } else {
1466 /*
1467 * One siga-w per buffer required for unicast
1468 * HiperSockets.
1469 */
1470 q->u.out.use_enh_siga = 0;
Jan Glauberd303b6f2009-03-26 15:24:31 +01001471 while (count--) {
1472 rc = qdio_kick_outbound_q(q);
1473 if (rc)
1474 goto out;
1475 }
Klaus-Dieter Wacker7a0f4752008-10-10 21:33:18 +02001476 }
Jan Glauber779e6e12008-07-17 17:16:48 +02001477 goto out;
1478 }
1479
1480 if (need_siga_sync(q)) {
1481 qdio_siga_sync_q(q);
1482 goto out;
1483 }
1484
1485 /* try to fast requeue buffers */
Jan Glauber50f769d2008-12-25 13:38:47 +01001486 get_buf_state(q, prev_buf(bufnr), &state, 0);
Jan Glauber779e6e12008-07-17 17:16:48 +02001487 if (state != SLSB_CU_OUTPUT_PRIMED)
Jan Glauberd303b6f2009-03-26 15:24:31 +01001488 rc = qdio_kick_outbound_q(q);
Jan Glauber1d7e1502009-09-22 22:58:39 +02001489 else
Jan Glauber6486cda2010-01-04 09:05:42 +01001490 qperf_inc(q, fast_requeue);
Jan Glauber1d7e1502009-09-22 22:58:39 +02001491
Jan Glauber779e6e12008-07-17 17:16:48 +02001492out:
Jan Glauber779e6e12008-07-17 17:16:48 +02001493 tasklet_schedule(&q->tasklet);
Jan Glauberd303b6f2009-03-26 15:24:31 +01001494 return rc;
Jan Glauber779e6e12008-07-17 17:16:48 +02001495}
1496
1497/**
1498 * do_QDIO - process input or output buffers
1499 * @cdev: associated ccw_device for the qdio subchannel
1500 * @callflags: input or output and special flags from the program
1501 * @q_nr: queue number
1502 * @bufnr: buffer number
1503 * @count: how many buffers to process
1504 */
1505int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
Jan Glauber66182412009-06-22 12:08:15 +02001506 int q_nr, unsigned int bufnr, unsigned int count)
Jan Glauber779e6e12008-07-17 17:16:48 +02001507{
1508 struct qdio_irq *irq_ptr;
Jan Glauber779e6e12008-07-17 17:16:48 +02001509
Jan Glauber66182412009-06-22 12:08:15 +02001510 if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
Jan Glauber779e6e12008-07-17 17:16:48 +02001511 return -EINVAL;
1512
Jan Glauber779e6e12008-07-17 17:16:48 +02001513 irq_ptr = cdev->private->qdio_data;
1514 if (!irq_ptr)
1515 return -ENODEV;
1516
Jan Glauber1d7e1502009-09-22 22:58:39 +02001517 DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1518 "do%02x b:%02x c:%02x", callflags, bufnr, count);
Jan Glauber779e6e12008-07-17 17:16:48 +02001519
1520 if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1521 return -EBUSY;
1522
1523 if (callflags & QDIO_FLAG_SYNC_INPUT)
Jan Glauberd303b6f2009-03-26 15:24:31 +01001524 return handle_inbound(irq_ptr->input_qs[q_nr],
1525 callflags, bufnr, count);
Jan Glauber779e6e12008-07-17 17:16:48 +02001526 else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
Jan Glauberd303b6f2009-03-26 15:24:31 +01001527 return handle_outbound(irq_ptr->output_qs[q_nr],
1528 callflags, bufnr, count);
1529 return -EINVAL;
Jan Glauber779e6e12008-07-17 17:16:48 +02001530}
1531EXPORT_SYMBOL_GPL(do_QDIO);
1532
Jan Glauberd36deae2010-09-07 21:14:39 +00001533/**
1534 * qdio_start_irq - process input buffers
1535 * @cdev: associated ccw_device for the qdio subchannel
1536 * @nr: input queue number
1537 *
1538 * Return codes
1539 * 0 - success
1540 * 1 - irqs not started since new data is available
1541 */
1542int qdio_start_irq(struct ccw_device *cdev, int nr)
1543{
1544 struct qdio_q *q;
1545 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1546
1547 if (!irq_ptr)
1548 return -ENODEV;
1549 q = irq_ptr->input_qs[nr];
1550
1551 WARN_ON(queue_irqs_enabled(q));
1552
1553 if (!shared_ind(q->irq_ptr))
1554 xchg(q->irq_ptr->dsci, 0);
1555
1556 qdio_stop_polling(q);
1557 clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1558
1559 /*
1560 * We need to check again to not lose initiative after
1561 * resetting the ACK state.
1562 */
1563 if (!shared_ind(q->irq_ptr) && *q->irq_ptr->dsci)
1564 goto rescan;
1565 if (!qdio_inbound_q_done(q))
1566 goto rescan;
1567 return 0;
1568
1569rescan:
1570 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1571 &q->u.in.queue_irq_state))
1572 return 0;
1573 else
1574 return 1;
1575
1576}
1577EXPORT_SYMBOL(qdio_start_irq);
1578
1579/**
1580 * qdio_get_next_buffers - process input buffers
1581 * @cdev: associated ccw_device for the qdio subchannel
1582 * @nr: input queue number
1583 * @bufnr: first filled buffer number
1584 * @error: buffers are in error state
1585 *
1586 * Return codes
1587 * < 0 - error
1588 * = 0 - no new buffers found
1589 * > 0 - number of processed buffers
1590 */
1591int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1592 int *error)
1593{
1594 struct qdio_q *q;
1595 int start, end;
1596 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1597
1598 if (!irq_ptr)
1599 return -ENODEV;
1600 q = irq_ptr->input_qs[nr];
1601 WARN_ON(queue_irqs_enabled(q));
1602
1603 qdio_sync_after_thinint(q);
1604
1605 /*
1606 * The interrupt could be caused by a PCI request. Check the
1607 * PCI capable outbound queues.
1608 */
1609 qdio_check_outbound_after_thinint(q);
1610
1611 if (!qdio_inbound_q_moved(q))
1612 return 0;
1613
1614 /* Note: upper-layer MUST stop processing immediately here ... */
1615 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1616 return -EIO;
1617
1618 start = q->first_to_kick;
1619 end = q->first_to_check;
1620 *bufnr = start;
1621 *error = q->qdio_error;
1622
1623 /* for the next time */
1624 q->first_to_kick = end;
1625 q->qdio_error = 0;
1626 return sub_buf(end, start);
1627}
1628EXPORT_SYMBOL(qdio_get_next_buffers);
1629
1630/**
1631 * qdio_stop_irq - disable interrupt processing for the device
1632 * @cdev: associated ccw_device for the qdio subchannel
1633 * @nr: input queue number
1634 *
1635 * Return codes
1636 * 0 - interrupts were already disabled
1637 * 1 - interrupts successfully disabled
1638 */
1639int qdio_stop_irq(struct ccw_device *cdev, int nr)
1640{
1641 struct qdio_q *q;
1642 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1643
1644 if (!irq_ptr)
1645 return -ENODEV;
1646 q = irq_ptr->input_qs[nr];
1647
1648 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1649 &q->u.in.queue_irq_state))
1650 return 0;
1651 else
1652 return 1;
1653}
1654EXPORT_SYMBOL(qdio_stop_irq);
1655
Jan Glauber779e6e12008-07-17 17:16:48 +02001656static int __init init_QDIO(void)
1657{
1658 int rc;
1659
1660 rc = qdio_setup_init();
1661 if (rc)
1662 return rc;
1663 rc = tiqdio_allocate_memory();
1664 if (rc)
1665 goto out_cache;
1666 rc = qdio_debug_init();
1667 if (rc)
1668 goto out_ti;
Jan Glauber779e6e12008-07-17 17:16:48 +02001669 rc = tiqdio_register_thinints();
1670 if (rc)
Jan Glauber6486cda2010-01-04 09:05:42 +01001671 goto out_debug;
Jan Glauber779e6e12008-07-17 17:16:48 +02001672 return 0;
1673
Jan Glauber779e6e12008-07-17 17:16:48 +02001674out_debug:
1675 qdio_debug_exit();
1676out_ti:
1677 tiqdio_free_memory();
1678out_cache:
1679 qdio_setup_exit();
1680 return rc;
1681}
1682
1683static void __exit exit_QDIO(void)
1684{
1685 tiqdio_unregister_thinints();
1686 tiqdio_free_memory();
Jan Glauber779e6e12008-07-17 17:16:48 +02001687 qdio_debug_exit();
1688 qdio_setup_exit();
1689}
1690
1691module_init(init_QDIO);
1692module_exit(exit_QDIO);