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Jan Glauber779e6e12008-07-17 17:16:48 +02001/*
2 * linux/drivers/s390/cio/thinint_qdio.c
3 *
Jan Glauber6486cda2010-01-04 09:05:42 +01004 * Copyright 2000,2009 IBM Corp.
Jan Glauber779e6e12008-07-17 17:16:48 +02005 * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
6 * Cornelia Huck <cornelia.huck@de.ibm.com>
7 * Jan Glauber <jang@linux.vnet.ibm.com>
8 */
9#include <linux/io.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090010#include <linux/slab.h>
Jan Glauber779e6e12008-07-17 17:16:48 +020011#include <asm/atomic.h>
12#include <asm/debug.h>
13#include <asm/qdio.h>
14#include <asm/airq.h>
15#include <asm/isc.h>
16
17#include "cio.h"
18#include "ioasm.h"
19#include "qdio.h"
20#include "qdio_debug.h"
Jan Glauber779e6e12008-07-17 17:16:48 +020021
22/*
23 * Restriction: only 63 iqdio subchannels would have its own indicator,
24 * after that, subsequent subchannels share one indicator
25 */
26#define TIQDIO_NR_NONSHARED_IND 63
27#define TIQDIO_NR_INDICATORS (TIQDIO_NR_NONSHARED_IND + 1)
Jan Glauber779e6e12008-07-17 17:16:48 +020028
29/* list of thin interrupt input queues */
30static LIST_HEAD(tiq_list);
Jan Glauberb4547402009-03-26 15:24:24 +010031DEFINE_MUTEX(tiq_list_lock);
Jan Glauber779e6e12008-07-17 17:16:48 +020032
33/* adapter local summary indicator */
Jan Glauberd36deae2010-09-07 21:14:39 +000034static u8 *tiqdio_alsi;
Jan Glauber779e6e12008-07-17 17:16:48 +020035
Jan Glauberd36deae2010-09-07 21:14:39 +000036struct indicator_t *q_indicators;
Jan Glauber779e6e12008-07-17 17:16:48 +020037
Jan Glauber779e6e12008-07-17 17:16:48 +020038static int css_qdio_omit_svs;
39
Jan Glauberd36deae2010-09-07 21:14:39 +000040static u64 last_ai_time;
41
Jan Glauber779e6e12008-07-17 17:16:48 +020042static inline unsigned long do_clear_global_summary(void)
43{
44 register unsigned long __fn asm("1") = 3;
45 register unsigned long __tmp asm("2");
46 register unsigned long __time asm("3");
47
48 asm volatile(
49 " .insn rre,0xb2650000,2,0"
50 : "+d" (__fn), "=d" (__tmp), "=d" (__time));
51 return __time;
52}
53
54/* returns addr for the device state change indicator */
55static u32 *get_indicator(void)
56{
57 int i;
58
59 for (i = 0; i < TIQDIO_NR_NONSHARED_IND; i++)
60 if (!atomic_read(&q_indicators[i].count)) {
61 atomic_set(&q_indicators[i].count, 1);
62 return &q_indicators[i].ind;
63 }
64
65 /* use the shared indicator */
66 atomic_inc(&q_indicators[TIQDIO_SHARED_IND].count);
67 return &q_indicators[TIQDIO_SHARED_IND].ind;
68}
69
70static void put_indicator(u32 *addr)
71{
72 int i;
73
74 if (!addr)
75 return;
76 i = ((unsigned long)addr - (unsigned long)q_indicators) /
77 sizeof(struct indicator_t);
78 atomic_dec(&q_indicators[i].count);
79}
80
81void tiqdio_add_input_queues(struct qdio_irq *irq_ptr)
82{
83 struct qdio_q *q;
84 int i;
85
86 /* No TDD facility? If we must use SIGA-s we can also omit SVS. */
87 if (!css_qdio_omit_svs && irq_ptr->siga_flag.sync)
88 css_qdio_omit_svs = 1;
89
Jan Glauberb4547402009-03-26 15:24:24 +010090 mutex_lock(&tiq_list_lock);
91 for_each_input_queue(irq_ptr, q, i)
Jan Glauber779e6e12008-07-17 17:16:48 +020092 list_add_rcu(&q->entry, &tiq_list);
Jan Glauberb4547402009-03-26 15:24:24 +010093 mutex_unlock(&tiq_list_lock);
Jan Glauberd0c9d4a2010-05-17 10:00:18 +020094 xchg(irq_ptr->dsci, 1 << 7);
Jan Glauber779e6e12008-07-17 17:16:48 +020095}
96
Jan Glauber779e6e12008-07-17 17:16:48 +020097void tiqdio_remove_input_queues(struct qdio_irq *irq_ptr)
98{
99 struct qdio_q *q;
100 int i;
101
Jan Glauber53b41ba2008-08-21 19:46:33 +0200102 for (i = 0; i < irq_ptr->nr_input_qs; i++) {
103 q = irq_ptr->input_qs[i];
104 /* if establish triggered an error */
105 if (!q || !q->entry.prev || !q->entry.next)
106 continue;
Jan Glauberb4547402009-03-26 15:24:24 +0100107
108 mutex_lock(&tiq_list_lock);
Jan Glauber779e6e12008-07-17 17:16:48 +0200109 list_del_rcu(&q->entry);
Jan Glauberb4547402009-03-26 15:24:24 +0100110 mutex_unlock(&tiq_list_lock);
Jan Glauber779e6e12008-07-17 17:16:48 +0200111 synchronize_rcu();
112 }
113}
114
Jan Glauberd36deae2010-09-07 21:14:39 +0000115static inline int shared_ind_used(void)
Jan Glauber779e6e12008-07-17 17:16:48 +0200116{
Jan Glauberd36deae2010-09-07 21:14:39 +0000117 return atomic_read(&q_indicators[TIQDIO_SHARED_IND].count);
Jan Glauber779e6e12008-07-17 17:16:48 +0200118}
119
Jan Glaubercf9a0312009-06-22 12:08:13 +0200120/**
121 * tiqdio_thinint_handler - thin interrupt handler for qdio
Jan Glauberd36deae2010-09-07 21:14:39 +0000122 * @alsi: pointer to adapter local summary indicator
123 * @data: NULL
Jan Glaubercf9a0312009-06-22 12:08:13 +0200124 */
Jan Glauberd36deae2010-09-07 21:14:39 +0000125static void tiqdio_thinint_handler(void *alsi, void *data)
Jan Glauber779e6e12008-07-17 17:16:48 +0200126{
127 struct qdio_q *q;
128
Jan Glauberd36deae2010-09-07 21:14:39 +0000129 last_ai_time = S390_lowcore.int_clock;
130
Jan Glaubercf9a0312009-06-22 12:08:13 +0200131 /*
132 * SVS only when needed: issue SVS to benefit from iqdio interrupt
Jan Glauberd36deae2010-09-07 21:14:39 +0000133 * avoidance (SVS clears adapter interrupt suppression overwrite).
Jan Glaubercf9a0312009-06-22 12:08:13 +0200134 */
135 if (!css_qdio_omit_svs)
136 do_clear_global_summary();
137
Jan Glauberd36deae2010-09-07 21:14:39 +0000138 /* reset local summary indicator */
139 if (shared_ind_used())
140 xchg(tiqdio_alsi, 0);
Jan Glauber779e6e12008-07-17 17:16:48 +0200141
142 /* protect tiq_list entries, only changed in activate or shutdown */
143 rcu_read_lock();
144
Jan Glaubercf9a0312009-06-22 12:08:13 +0200145 /* check for work on all inbound thinint queues */
Jan Glauberd36deae2010-09-07 21:14:39 +0000146 list_for_each_entry_rcu(q, &tiq_list, entry) {
Jan Glauber779e6e12008-07-17 17:16:48 +0200147
Jan Glauberd36deae2010-09-07 21:14:39 +0000148 /* only process queues from changed sets */
149 if (!*q->irq_ptr->dsci)
150 continue;
151
152 if (q->u.in.queue_start_poll) {
153 /* skip if polling is enabled or already in work */
154 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
155 &q->u.in.queue_irq_state)) {
156 qperf_inc(q, int_discarded);
157 continue;
158 }
159
160 /* avoid dsci clear here, done after processing */
161 q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
162 q->irq_ptr->int_parm);
163 } else {
Jan Glauber779e6e12008-07-17 17:16:48 +0200164 /* only clear it if the indicator is non-shared */
165 if (!shared_ind(q->irq_ptr))
166 xchg(q->irq_ptr->dsci, 0);
167 /*
Jan Glauberd36deae2010-09-07 21:14:39 +0000168 * Call inbound processing but not directly
169 * since that could starve other thinint queues.
Jan Glauber779e6e12008-07-17 17:16:48 +0200170 */
171 tasklet_schedule(&q->tasklet);
172 }
Jan Glauberd36deae2010-09-07 21:14:39 +0000173 qperf_inc(q, adapter_int);
174 }
Jan Glauber779e6e12008-07-17 17:16:48 +0200175 rcu_read_unlock();
176
177 /*
Jan Glauberd36deae2010-09-07 21:14:39 +0000178 * If the shared indicator was used clear it now after all queues
179 * were processed.
Jan Glauber779e6e12008-07-17 17:16:48 +0200180 */
Jan Glauberd36deae2010-09-07 21:14:39 +0000181 if (shared_ind_used()) {
Jan Glauber779e6e12008-07-17 17:16:48 +0200182 xchg(&q_indicators[TIQDIO_SHARED_IND].ind, 0);
183
184 /* prevent racing */
185 if (*tiqdio_alsi)
Jan Glauberd0c9d4a2010-05-17 10:00:18 +0200186 xchg(&q_indicators[TIQDIO_SHARED_IND].ind, 1 << 7);
Jan Glauber779e6e12008-07-17 17:16:48 +0200187 }
Jan Glauber779e6e12008-07-17 17:16:48 +0200188}
189
190static int set_subchannel_ind(struct qdio_irq *irq_ptr, int reset)
191{
192 struct scssc_area *scssc_area;
Jan Glauber779e6e12008-07-17 17:16:48 +0200193 int rc;
194
195 scssc_area = (struct scssc_area *)irq_ptr->chsc_page;
196 memset(scssc_area, 0, PAGE_SIZE);
197
198 if (reset) {
199 scssc_area->summary_indicator_addr = 0;
200 scssc_area->subchannel_indicator_addr = 0;
201 } else {
202 scssc_area->summary_indicator_addr = virt_to_phys(tiqdio_alsi);
203 scssc_area->subchannel_indicator_addr =
204 virt_to_phys(irq_ptr->dsci);
205 }
206
207 scssc_area->request = (struct chsc_header) {
208 .length = 0x0fe0,
209 .code = 0x0021,
210 };
211 scssc_area->operation_code = 0;
Heiko Carstensd1bf8592010-02-26 22:37:30 +0100212 scssc_area->ks = PAGE_DEFAULT_KEY >> 4;
213 scssc_area->kc = PAGE_DEFAULT_KEY >> 4;
Jan Glauber779e6e12008-07-17 17:16:48 +0200214 scssc_area->isc = QDIO_AIRQ_ISC;
215 scssc_area->schid = irq_ptr->schid;
216
217 /* enable the time delay disablement facility */
218 if (css_general_characteristics.aif_tdd)
219 scssc_area->word_with_d_bit = 0x10000000;
220
221 rc = chsc(scssc_area);
222 if (rc)
223 return -EIO;
224
225 rc = chsc_error_from_response(scssc_area->response.code);
226 if (rc) {
Jan Glauber22f99342008-12-25 13:38:46 +0100227 DBF_ERROR("%4x SSI r:%4x", irq_ptr->schid.sch_no,
228 scssc_area->response.code);
229 DBF_ERROR_HEX(&scssc_area->response, sizeof(void *));
Jan Glauber779e6e12008-07-17 17:16:48 +0200230 return rc;
231 }
232
Jan Glauber22f99342008-12-25 13:38:46 +0100233 DBF_EVENT("setscind");
234 DBF_HEX(&scssc_area->summary_indicator_addr, sizeof(unsigned long));
235 DBF_HEX(&scssc_area->subchannel_indicator_addr, sizeof(unsigned long));
Jan Glauber779e6e12008-07-17 17:16:48 +0200236 return 0;
237}
238
239/* allocate non-shared indicators and shared indicator */
240int __init tiqdio_allocate_memory(void)
241{
242 q_indicators = kzalloc(sizeof(struct indicator_t) * TIQDIO_NR_INDICATORS,
243 GFP_KERNEL);
244 if (!q_indicators)
245 return -ENOMEM;
246 return 0;
247}
248
249void tiqdio_free_memory(void)
250{
251 kfree(q_indicators);
252}
253
254int __init tiqdio_register_thinints(void)
255{
Jan Glauber779e6e12008-07-17 17:16:48 +0200256 isc_register(QDIO_AIRQ_ISC);
257 tiqdio_alsi = s390_register_adapter_interrupt(&tiqdio_thinint_handler,
258 NULL, QDIO_AIRQ_ISC);
259 if (IS_ERR(tiqdio_alsi)) {
Jan Glauber22f99342008-12-25 13:38:46 +0100260 DBF_EVENT("RTI:%lx", PTR_ERR(tiqdio_alsi));
Jan Glauber779e6e12008-07-17 17:16:48 +0200261 tiqdio_alsi = NULL;
262 isc_unregister(QDIO_AIRQ_ISC);
263 return -ENOMEM;
264 }
265 return 0;
266}
267
268int qdio_establish_thinint(struct qdio_irq *irq_ptr)
269{
270 if (!is_thinint_irq(irq_ptr))
271 return 0;
272
273 /* Check for aif time delay disablement. If installed,
274 * omit SVS even under LPAR
275 */
276 if (css_general_characteristics.aif_tdd)
277 css_qdio_omit_svs = 1;
278 return set_subchannel_ind(irq_ptr, 0);
279}
280
281void qdio_setup_thinint(struct qdio_irq *irq_ptr)
282{
283 if (!is_thinint_irq(irq_ptr))
284 return;
285 irq_ptr->dsci = get_indicator();
Jan Glauber22f99342008-12-25 13:38:46 +0100286 DBF_HEX(&irq_ptr->dsci, sizeof(void *));
Jan Glauber779e6e12008-07-17 17:16:48 +0200287}
288
289void qdio_shutdown_thinint(struct qdio_irq *irq_ptr)
290{
291 if (!is_thinint_irq(irq_ptr))
292 return;
293
294 /* reset adapter interrupt indicators */
Jan Glauber779e6e12008-07-17 17:16:48 +0200295 set_subchannel_ind(irq_ptr, 1);
Jan Glauber4814a2b2010-11-25 09:52:46 +0100296 put_indicator(irq_ptr->dsci);
Jan Glauber779e6e12008-07-17 17:16:48 +0200297}
298
299void __exit tiqdio_unregister_thinints(void)
300{
Jan Glauber9e890ad2009-03-26 15:24:30 +0100301 WARN_ON(!list_empty(&tiq_list));
Jan Glauber779e6e12008-07-17 17:16:48 +0200302
303 if (tiqdio_alsi) {
304 s390_unregister_adapter_interrupt(tiqdio_alsi, QDIO_AIRQ_ISC);
305 isc_unregister(QDIO_AIRQ_ISC);
306 }
Jan Glauber779e6e12008-07-17 17:16:48 +0200307}