This source file includes following definitions.
- waiter_release
- add_waiter_to_queue
- remove_completed_waiters
- reset_threshold_interrupt
- action_submit_complete
- action_wakeup
- action_wakeup_interruptible
- run_handlers
- process_wait_list
- syncpt_thresh_work
- host1x_intr_add_action
- host1x_intr_put_ref
- host1x_intr_init
- host1x_intr_deinit
- host1x_intr_start
- host1x_intr_stop
1
2
3
4
5
6
7
8 #include <linux/clk.h>
9 #include <linux/interrupt.h>
10 #include <linux/slab.h>
11 #include <linux/irq.h>
12
13 #include <trace/events/host1x.h>
14 #include "channel.h"
15 #include "dev.h"
16 #include "intr.h"
17
18
19
20 enum waitlist_state {
21 WLS_PENDING,
22 WLS_REMOVED,
23 WLS_CANCELLED,
24 WLS_HANDLED
25 };
26
27 static void waiter_release(struct kref *kref)
28 {
29 kfree(container_of(kref, struct host1x_waitlist, refcount));
30 }
31
32
33
34
35
36 static bool add_waiter_to_queue(struct host1x_waitlist *waiter,
37 struct list_head *queue)
38 {
39 struct host1x_waitlist *pos;
40 u32 thresh = waiter->thresh;
41
42 list_for_each_entry_reverse(pos, queue, list)
43 if ((s32)(pos->thresh - thresh) <= 0) {
44 list_add(&waiter->list, &pos->list);
45 return false;
46 }
47
48 list_add(&waiter->list, queue);
49 return true;
50 }
51
52
53
54
55
56 static void remove_completed_waiters(struct list_head *head, u32 sync,
57 struct list_head completed[HOST1X_INTR_ACTION_COUNT])
58 {
59 struct list_head *dest;
60 struct host1x_waitlist *waiter, *next, *prev;
61
62 list_for_each_entry_safe(waiter, next, head, list) {
63 if ((s32)(waiter->thresh - sync) > 0)
64 break;
65
66 dest = completed + waiter->action;
67
68
69 if (waiter->action == HOST1X_INTR_ACTION_SUBMIT_COMPLETE &&
70 !list_empty(dest)) {
71 prev = list_entry(dest->prev,
72 struct host1x_waitlist, list);
73 if (prev->data == waiter->data) {
74 prev->count++;
75 dest = NULL;
76 }
77 }
78
79
80 if (atomic_inc_return(&waiter->state) == WLS_HANDLED || !dest) {
81 list_del(&waiter->list);
82 kref_put(&waiter->refcount, waiter_release);
83 } else
84 list_move_tail(&waiter->list, dest);
85 }
86 }
87
88 static void reset_threshold_interrupt(struct host1x *host,
89 struct list_head *head,
90 unsigned int id)
91 {
92 u32 thresh =
93 list_first_entry(head, struct host1x_waitlist, list)->thresh;
94
95 host1x_hw_intr_set_syncpt_threshold(host, id, thresh);
96 host1x_hw_intr_enable_syncpt_intr(host, id);
97 }
98
99 static void action_submit_complete(struct host1x_waitlist *waiter)
100 {
101 struct host1x_channel *channel = waiter->data;
102
103 host1x_cdma_update(&channel->cdma);
104
105
106 trace_host1x_channel_submit_complete(dev_name(channel->dev),
107 waiter->count, waiter->thresh);
108
109 }
110
111 static void action_wakeup(struct host1x_waitlist *waiter)
112 {
113 wait_queue_head_t *wq = waiter->data;
114
115 wake_up(wq);
116 }
117
118 static void action_wakeup_interruptible(struct host1x_waitlist *waiter)
119 {
120 wait_queue_head_t *wq = waiter->data;
121
122 wake_up_interruptible(wq);
123 }
124
125 typedef void (*action_handler)(struct host1x_waitlist *waiter);
126
127 static const action_handler action_handlers[HOST1X_INTR_ACTION_COUNT] = {
128 action_submit_complete,
129 action_wakeup,
130 action_wakeup_interruptible,
131 };
132
133 static void run_handlers(struct list_head completed[HOST1X_INTR_ACTION_COUNT])
134 {
135 struct list_head *head = completed;
136 unsigned int i;
137
138 for (i = 0; i < HOST1X_INTR_ACTION_COUNT; ++i, ++head) {
139 action_handler handler = action_handlers[i];
140 struct host1x_waitlist *waiter, *next;
141
142 list_for_each_entry_safe(waiter, next, head, list) {
143 list_del(&waiter->list);
144 handler(waiter);
145 WARN_ON(atomic_xchg(&waiter->state, WLS_HANDLED) !=
146 WLS_REMOVED);
147 kref_put(&waiter->refcount, waiter_release);
148 }
149 }
150 }
151
152
153
154
155 static int process_wait_list(struct host1x *host,
156 struct host1x_syncpt *syncpt,
157 u32 threshold)
158 {
159 struct list_head completed[HOST1X_INTR_ACTION_COUNT];
160 unsigned int i;
161 int empty;
162
163 for (i = 0; i < HOST1X_INTR_ACTION_COUNT; ++i)
164 INIT_LIST_HEAD(completed + i);
165
166 spin_lock(&syncpt->intr.lock);
167
168 remove_completed_waiters(&syncpt->intr.wait_head, threshold,
169 completed);
170
171 empty = list_empty(&syncpt->intr.wait_head);
172 if (empty)
173 host1x_hw_intr_disable_syncpt_intr(host, syncpt->id);
174 else
175 reset_threshold_interrupt(host, &syncpt->intr.wait_head,
176 syncpt->id);
177
178 spin_unlock(&syncpt->intr.lock);
179
180 run_handlers(completed);
181
182 return empty;
183 }
184
185
186
187
188
189
190 static void syncpt_thresh_work(struct work_struct *work)
191 {
192 struct host1x_syncpt_intr *syncpt_intr =
193 container_of(work, struct host1x_syncpt_intr, work);
194 struct host1x_syncpt *syncpt =
195 container_of(syncpt_intr, struct host1x_syncpt, intr);
196 unsigned int id = syncpt->id;
197 struct host1x *host = syncpt->host;
198
199 (void)process_wait_list(host, syncpt,
200 host1x_syncpt_load(host->syncpt + id));
201 }
202
203 int host1x_intr_add_action(struct host1x *host, struct host1x_syncpt *syncpt,
204 u32 thresh, enum host1x_intr_action action,
205 void *data, struct host1x_waitlist *waiter,
206 void **ref)
207 {
208 int queue_was_empty;
209
210 if (waiter == NULL) {
211 pr_warn("%s: NULL waiter\n", __func__);
212 return -EINVAL;
213 }
214
215
216 INIT_LIST_HEAD(&waiter->list);
217 kref_init(&waiter->refcount);
218 if (ref)
219 kref_get(&waiter->refcount);
220 waiter->thresh = thresh;
221 waiter->action = action;
222 atomic_set(&waiter->state, WLS_PENDING);
223 waiter->data = data;
224 waiter->count = 1;
225
226 spin_lock(&syncpt->intr.lock);
227
228 queue_was_empty = list_empty(&syncpt->intr.wait_head);
229
230 if (add_waiter_to_queue(waiter, &syncpt->intr.wait_head)) {
231
232 host1x_hw_intr_set_syncpt_threshold(host, syncpt->id, thresh);
233
234
235 if (queue_was_empty)
236 host1x_hw_intr_enable_syncpt_intr(host, syncpt->id);
237 }
238
239 spin_unlock(&syncpt->intr.lock);
240
241 if (ref)
242 *ref = waiter;
243 return 0;
244 }
245
246 void host1x_intr_put_ref(struct host1x *host, unsigned int id, void *ref)
247 {
248 struct host1x_waitlist *waiter = ref;
249 struct host1x_syncpt *syncpt;
250
251 while (atomic_cmpxchg(&waiter->state, WLS_PENDING, WLS_CANCELLED) ==
252 WLS_REMOVED)
253 schedule();
254
255 syncpt = host->syncpt + id;
256 (void)process_wait_list(host, syncpt,
257 host1x_syncpt_load(host->syncpt + id));
258
259 kref_put(&waiter->refcount, waiter_release);
260 }
261
262 int host1x_intr_init(struct host1x *host, unsigned int irq_sync)
263 {
264 unsigned int id;
265 u32 nb_pts = host1x_syncpt_nb_pts(host);
266
267 mutex_init(&host->intr_mutex);
268 host->intr_syncpt_irq = irq_sync;
269
270 for (id = 0; id < nb_pts; ++id) {
271 struct host1x_syncpt *syncpt = host->syncpt + id;
272
273 spin_lock_init(&syncpt->intr.lock);
274 INIT_LIST_HEAD(&syncpt->intr.wait_head);
275 snprintf(syncpt->intr.thresh_irq_name,
276 sizeof(syncpt->intr.thresh_irq_name),
277 "host1x_sp_%02u", id);
278 }
279
280 host1x_intr_start(host);
281
282 return 0;
283 }
284
285 void host1x_intr_deinit(struct host1x *host)
286 {
287 host1x_intr_stop(host);
288 }
289
290 void host1x_intr_start(struct host1x *host)
291 {
292 u32 hz = clk_get_rate(host->clk);
293 int err;
294
295 mutex_lock(&host->intr_mutex);
296 err = host1x_hw_intr_init_host_sync(host, DIV_ROUND_UP(hz, 1000000),
297 syncpt_thresh_work);
298 if (err) {
299 mutex_unlock(&host->intr_mutex);
300 return;
301 }
302 mutex_unlock(&host->intr_mutex);
303 }
304
305 void host1x_intr_stop(struct host1x *host)
306 {
307 unsigned int id;
308 struct host1x_syncpt *syncpt = host->syncpt;
309 u32 nb_pts = host1x_syncpt_nb_pts(host);
310
311 mutex_lock(&host->intr_mutex);
312
313 host1x_hw_intr_disable_all_syncpt_intrs(host);
314
315 for (id = 0; id < nb_pts; ++id) {
316 struct host1x_waitlist *waiter, *next;
317
318 list_for_each_entry_safe(waiter, next,
319 &syncpt[id].intr.wait_head, list) {
320 if (atomic_cmpxchg(&waiter->state,
321 WLS_CANCELLED, WLS_HANDLED) == WLS_CANCELLED) {
322 list_del(&waiter->list);
323 kref_put(&waiter->refcount, waiter_release);
324 }
325 }
326
327 if (!list_empty(&syncpt[id].intr.wait_head)) {
328
329 mutex_unlock(&host->intr_mutex);
330 pr_warn("%s cannot stop syncpt intr id=%u\n",
331 __func__, id);
332 return;
333 }
334 }
335
336 host1x_hw_intr_free_syncpt_irq(host);
337
338 mutex_unlock(&host->intr_mutex);
339 }