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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Tegra host1x Interrupt Management
4 *
5 * Copyright (c) 2010-2021, NVIDIA Corporation.
6 */
7
8#include <linux/clk.h>
9#include <linux/interrupt.h>
10#include "dev.h"
11#include "fence.h"
12#include "intr.h"
13
14static void host1x_intr_add_fence_to_list(struct host1x_fence_list *list,
15 struct host1x_syncpt_fence *fence)
16{
17 struct host1x_syncpt_fence *fence_in_list;
18
19 list_for_each_entry_reverse(fence_in_list, &list->list, list) {
20 if ((s32)(fence_in_list->threshold - fence->threshold) <= 0) {
21 /* Fence in list is before us, we can insert here */
22 list_add(&fence->list, &fence_in_list->list);
23 return;
24 }
25 }
26
27 /* Add as first in list */
28 list_add(&fence->list, &list->list);
29}
30
31static void host1x_intr_update_hw_state(struct host1x *host, struct host1x_syncpt *sp)
32{
33 struct host1x_syncpt_fence *fence;
34
35 if (!list_empty(&sp->fences.list)) {
36 fence = list_first_entry(&sp->fences.list, struct host1x_syncpt_fence, list);
37
38 host1x_hw_intr_set_syncpt_threshold(host, sp->id, fence->threshold);
39 host1x_hw_intr_enable_syncpt_intr(host, sp->id);
40 } else {
41 host1x_hw_intr_disable_syncpt_intr(host, sp->id);
42 }
43}
44
45void host1x_intr_add_fence_locked(struct host1x *host, struct host1x_syncpt_fence *fence)
46{
47 struct host1x_fence_list *fence_list = &fence->sp->fences;
48
49 INIT_LIST_HEAD(&fence->list);
50
51 host1x_intr_add_fence_to_list(fence_list, fence);
52 host1x_intr_update_hw_state(host, fence->sp);
53}
54
55bool host1x_intr_remove_fence(struct host1x *host, struct host1x_syncpt_fence *fence)
56{
57 struct host1x_fence_list *fence_list = &fence->sp->fences;
58 unsigned long irqflags;
59
60 spin_lock_irqsave(&fence_list->lock, irqflags);
61
62 if (list_empty(&fence->list)) {
63 spin_unlock_irqrestore(&fence_list->lock, irqflags);
64 return false;
65 }
66
67 list_del_init(&fence->list);
68 host1x_intr_update_hw_state(host, fence->sp);
69
70 spin_unlock_irqrestore(&fence_list->lock, irqflags);
71
72 return true;
73}
74
75void host1x_intr_handle_interrupt(struct host1x *host, unsigned int id)
76{
77 struct host1x_syncpt *sp = &host->syncpt[id];
78 struct host1x_syncpt_fence *fence, *tmp;
79 unsigned int value;
80
81 value = host1x_syncpt_load(sp);
82
83 spin_lock(&sp->fences.lock);
84
85 list_for_each_entry_safe(fence, tmp, &sp->fences.list, list) {
86 if (((value - fence->threshold) & 0x80000000U) != 0U) {
87 /* Fence is not yet expired, we are done */
88 break;
89 }
90
91 list_del_init(&fence->list);
92 host1x_fence_signal(fence);
93 }
94
95 /* Re-enable interrupt if necessary */
96 host1x_intr_update_hw_state(host, sp);
97
98 spin_unlock(&sp->fences.lock);
99}
100
101int host1x_intr_init(struct host1x *host)
102{
103 struct host1x_intr_irq_data *irq_data;
104 unsigned int id;
105 int i, err;
106
107 for (id = 0; id < host1x_syncpt_nb_pts(host); ++id) {
108 struct host1x_syncpt *syncpt = &host->syncpt[id];
109
110 spin_lock_init(&syncpt->fences.lock);
111 INIT_LIST_HEAD(&syncpt->fences.list);
112 }
113
114 irq_data = devm_kcalloc(host->dev, host->num_syncpt_irqs, sizeof(irq_data[0]), GFP_KERNEL);
115 if (!irq_data)
116 return -ENOMEM;
117
118 host1x_hw_intr_disable_all_syncpt_intrs(host);
119
120 for (i = 0; i < host->num_syncpt_irqs; i++) {
121 irq_data[i].host = host;
122 irq_data[i].offset = i;
123
124 err = devm_request_irq(host->dev, host->syncpt_irqs[i],
125 host->intr_op->isr, IRQF_SHARED,
126 "host1x_syncpt", &irq_data[i]);
127 if (err < 0)
128 return err;
129 }
130
131 return 0;
132}
133
134void host1x_intr_deinit(struct host1x *host)
135{
136}
137
138void host1x_intr_start(struct host1x *host)
139{
140 u32 hz = clk_get_rate(host->clk);
141 int err;
142
143 mutex_lock(&host->intr_mutex);
144 err = host1x_hw_intr_init_host_sync(host, DIV_ROUND_UP(hz, 1000000));
145 if (err) {
146 mutex_unlock(&host->intr_mutex);
147 return;
148 }
149 mutex_unlock(&host->intr_mutex);
150}
151
152void host1x_intr_stop(struct host1x *host)
153{
154 host1x_hw_intr_disable_all_syncpt_intrs(host);
155}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Tegra host1x Interrupt Management
4 *
5 * Copyright (c) 2010-2013, NVIDIA Corporation.
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/* Wait list management */
19
20enum waitlist_state {
21 WLS_PENDING,
22 WLS_REMOVED,
23 WLS_CANCELLED,
24 WLS_HANDLED
25};
26
27static void waiter_release(struct kref *kref)
28{
29 kfree(container_of(kref, struct host1x_waitlist, refcount));
30}
31
32/*
33 * add a waiter to a waiter queue, sorted by threshold
34 * returns true if it was added at the head of the queue
35 */
36static 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 * run through a waiter queue for a single sync point ID
54 * and gather all completed waiters into lists by actions
55 */
56static 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 /* consolidate submit cleanups */
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 /* PENDING->REMOVED or CANCELLED->HANDLED */
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
88static 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
99static 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 /* Add nr_completed to trace */
106 trace_host1x_channel_submit_complete(dev_name(channel->dev),
107 waiter->count, waiter->thresh);
108}
109
110static void action_wakeup(struct host1x_waitlist *waiter)
111{
112 wait_queue_head_t *wq = waiter->data;
113
114 wake_up(wq);
115}
116
117static void action_wakeup_interruptible(struct host1x_waitlist *waiter)
118{
119 wait_queue_head_t *wq = waiter->data;
120
121 wake_up_interruptible(wq);
122}
123
124typedef void (*action_handler)(struct host1x_waitlist *waiter);
125
126static const action_handler action_handlers[HOST1X_INTR_ACTION_COUNT] = {
127 action_submit_complete,
128 action_wakeup,
129 action_wakeup_interruptible,
130};
131
132static void run_handlers(struct list_head completed[HOST1X_INTR_ACTION_COUNT])
133{
134 struct list_head *head = completed;
135 unsigned int i;
136
137 for (i = 0; i < HOST1X_INTR_ACTION_COUNT; ++i, ++head) {
138 action_handler handler = action_handlers[i];
139 struct host1x_waitlist *waiter, *next;
140
141 list_for_each_entry_safe(waiter, next, head, list) {
142 list_del(&waiter->list);
143 handler(waiter);
144 WARN_ON(atomic_xchg(&waiter->state, WLS_HANDLED) !=
145 WLS_REMOVED);
146 kref_put(&waiter->refcount, waiter_release);
147 }
148 }
149}
150
151/*
152 * Remove & handle all waiters that have completed for the given syncpt
153 */
154static int process_wait_list(struct host1x *host,
155 struct host1x_syncpt *syncpt,
156 u32 threshold)
157{
158 struct list_head completed[HOST1X_INTR_ACTION_COUNT];
159 unsigned int i;
160 int empty;
161
162 for (i = 0; i < HOST1X_INTR_ACTION_COUNT; ++i)
163 INIT_LIST_HEAD(completed + i);
164
165 spin_lock(&syncpt->intr.lock);
166
167 remove_completed_waiters(&syncpt->intr.wait_head, threshold,
168 completed);
169
170 empty = list_empty(&syncpt->intr.wait_head);
171 if (empty)
172 host1x_hw_intr_disable_syncpt_intr(host, syncpt->id);
173 else
174 reset_threshold_interrupt(host, &syncpt->intr.wait_head,
175 syncpt->id);
176
177 spin_unlock(&syncpt->intr.lock);
178
179 run_handlers(completed);
180
181 return empty;
182}
183
184/*
185 * Sync point threshold interrupt service thread function
186 * Handles sync point threshold triggers, in thread context
187 */
188
189static void syncpt_thresh_work(struct work_struct *work)
190{
191 struct host1x_syncpt_intr *syncpt_intr =
192 container_of(work, struct host1x_syncpt_intr, work);
193 struct host1x_syncpt *syncpt =
194 container_of(syncpt_intr, struct host1x_syncpt, intr);
195 unsigned int id = syncpt->id;
196 struct host1x *host = syncpt->host;
197
198 (void)process_wait_list(host, syncpt,
199 host1x_syncpt_load(host->syncpt + id));
200}
201
202int host1x_intr_add_action(struct host1x *host, struct host1x_syncpt *syncpt,
203 u32 thresh, enum host1x_intr_action action,
204 void *data, struct host1x_waitlist *waiter,
205 void **ref)
206{
207 int queue_was_empty;
208
209 if (waiter == NULL) {
210 pr_warn("%s: NULL waiter\n", __func__);
211 return -EINVAL;
212 }
213
214 /* initialize a new waiter */
215 INIT_LIST_HEAD(&waiter->list);
216 kref_init(&waiter->refcount);
217 if (ref)
218 kref_get(&waiter->refcount);
219 waiter->thresh = thresh;
220 waiter->action = action;
221 atomic_set(&waiter->state, WLS_PENDING);
222 waiter->data = data;
223 waiter->count = 1;
224
225 spin_lock(&syncpt->intr.lock);
226
227 queue_was_empty = list_empty(&syncpt->intr.wait_head);
228
229 if (add_waiter_to_queue(waiter, &syncpt->intr.wait_head)) {
230 /* added at head of list - new threshold value */
231 host1x_hw_intr_set_syncpt_threshold(host, syncpt->id, thresh);
232
233 /* added as first waiter - enable interrupt */
234 if (queue_was_empty)
235 host1x_hw_intr_enable_syncpt_intr(host, syncpt->id);
236 }
237
238 spin_unlock(&syncpt->intr.lock);
239
240 if (ref)
241 *ref = waiter;
242 return 0;
243}
244
245void host1x_intr_put_ref(struct host1x *host, unsigned int id, void *ref)
246{
247 struct host1x_waitlist *waiter = ref;
248 struct host1x_syncpt *syncpt;
249
250 while (atomic_cmpxchg(&waiter->state, WLS_PENDING, WLS_CANCELLED) ==
251 WLS_REMOVED)
252 schedule();
253
254 syncpt = host->syncpt + id;
255 (void)process_wait_list(host, syncpt,
256 host1x_syncpt_load(host->syncpt + id));
257
258 kref_put(&waiter->refcount, waiter_release);
259}
260
261int host1x_intr_init(struct host1x *host, unsigned int irq_sync)
262{
263 unsigned int id;
264 u32 nb_pts = host1x_syncpt_nb_pts(host);
265
266 mutex_init(&host->intr_mutex);
267 host->intr_syncpt_irq = irq_sync;
268
269 for (id = 0; id < nb_pts; ++id) {
270 struct host1x_syncpt *syncpt = host->syncpt + id;
271
272 spin_lock_init(&syncpt->intr.lock);
273 INIT_LIST_HEAD(&syncpt->intr.wait_head);
274 snprintf(syncpt->intr.thresh_irq_name,
275 sizeof(syncpt->intr.thresh_irq_name),
276 "host1x_sp_%02u", id);
277 }
278
279 host1x_intr_start(host);
280
281 return 0;
282}
283
284void host1x_intr_deinit(struct host1x *host)
285{
286 host1x_intr_stop(host);
287}
288
289void host1x_intr_start(struct host1x *host)
290{
291 u32 hz = clk_get_rate(host->clk);
292 int err;
293
294 mutex_lock(&host->intr_mutex);
295 err = host1x_hw_intr_init_host_sync(host, DIV_ROUND_UP(hz, 1000000),
296 syncpt_thresh_work);
297 if (err) {
298 mutex_unlock(&host->intr_mutex);
299 return;
300 }
301 mutex_unlock(&host->intr_mutex);
302}
303
304void host1x_intr_stop(struct host1x *host)
305{
306 unsigned int id;
307 struct host1x_syncpt *syncpt = host->syncpt;
308 u32 nb_pts = host1x_syncpt_nb_pts(host);
309
310 mutex_lock(&host->intr_mutex);
311
312 host1x_hw_intr_disable_all_syncpt_intrs(host);
313
314 for (id = 0; id < nb_pts; ++id) {
315 struct host1x_waitlist *waiter, *next;
316
317 list_for_each_entry_safe(waiter, next,
318 &syncpt[id].intr.wait_head, list) {
319 if (atomic_cmpxchg(&waiter->state,
320 WLS_CANCELLED, WLS_HANDLED) == WLS_CANCELLED) {
321 list_del(&waiter->list);
322 kref_put(&waiter->refcount, waiter_release);
323 }
324 }
325
326 if (!list_empty(&syncpt[id].intr.wait_head)) {
327 /* output diagnostics */
328 mutex_unlock(&host->intr_mutex);
329 pr_warn("%s cannot stop syncpt intr id=%u\n",
330 __func__, id);
331 return;
332 }
333 }
334
335 host1x_hw_intr_free_syncpt_irq(host);
336
337 mutex_unlock(&host->intr_mutex);
338}