1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * vivid-kthread-out.h - video/vbi output thread support functions.
4 *
5 * Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
6 */
7
8 #include <linux/module.h>
9 #include <linux/errno.h>
10 #include <linux/kernel.h>
11 #include <linux/init.h>
12 #include <linux/sched.h>
13 #include <linux/slab.h>
14 #include <linux/font.h>
15 #include <linux/mutex.h>
16 #include <linux/videodev2.h>
17 #include <linux/kthread.h>
18 #include <linux/freezer.h>
19 #include <linux/random.h>
20 #include <linux/v4l2-dv-timings.h>
21 #include <linux/jiffies.h>
22 #include <asm/div64.h>
23 #include <media/videobuf2-vmalloc.h>
24 #include <media/v4l2-dv-timings.h>
25 #include <media/v4l2-ioctl.h>
26 #include <media/v4l2-fh.h>
27 #include <media/v4l2-event.h>
28
29 #include "vivid-core.h"
30 #include "vivid-vid-common.h"
31 #include "vivid-vid-cap.h"
32 #include "vivid-vid-out.h"
33 #include "vivid-radio-common.h"
34 #include "vivid-radio-rx.h"
35 #include "vivid-radio-tx.h"
36 #include "vivid-sdr-cap.h"
37 #include "vivid-vbi-cap.h"
38 #include "vivid-vbi-out.h"
39 #include "vivid-osd.h"
40 #include "vivid-ctrls.h"
41 #include "vivid-kthread-out.h"
42 #include "vivid-meta-out.h"
43
vivid_thread_vid_out_tick(struct vivid_dev * dev)44 static void vivid_thread_vid_out_tick(struct vivid_dev *dev)
45 {
46 struct vivid_buffer *vid_out_buf = NULL;
47 struct vivid_buffer *vbi_out_buf = NULL;
48 struct vivid_buffer *meta_out_buf = NULL;
49
50 dprintk(dev, 1, "Video Output Thread Tick\n");
51
52 /* Drop a certain percentage of buffers. */
53 if (dev->perc_dropped_buffers &&
54 prandom_u32_max(100) < dev->perc_dropped_buffers)
55 return;
56
57 spin_lock(&dev->slock);
58 /*
59 * Only dequeue buffer if there is at least one more pending.
60 * This makes video loopback possible.
61 */
62 if (!list_empty(&dev->vid_out_active) &&
63 !list_is_singular(&dev->vid_out_active)) {
64 vid_out_buf = list_entry(dev->vid_out_active.next,
65 struct vivid_buffer, list);
66 list_del(&vid_out_buf->list);
67 }
68 if (!list_empty(&dev->vbi_out_active) &&
69 (dev->field_out != V4L2_FIELD_ALTERNATE ||
70 (dev->vbi_out_seq_count & 1))) {
71 vbi_out_buf = list_entry(dev->vbi_out_active.next,
72 struct vivid_buffer, list);
73 list_del(&vbi_out_buf->list);
74 }
75 if (!list_empty(&dev->meta_out_active)) {
76 meta_out_buf = list_entry(dev->meta_out_active.next,
77 struct vivid_buffer, list);
78 list_del(&meta_out_buf->list);
79 }
80 spin_unlock(&dev->slock);
81
82 if (!vid_out_buf && !vbi_out_buf && !meta_out_buf)
83 return;
84
85 if (vid_out_buf) {
86 v4l2_ctrl_request_setup(vid_out_buf->vb.vb2_buf.req_obj.req,
87 &dev->ctrl_hdl_vid_out);
88 v4l2_ctrl_request_complete(vid_out_buf->vb.vb2_buf.req_obj.req,
89 &dev->ctrl_hdl_vid_out);
90 vid_out_buf->vb.sequence = dev->vid_out_seq_count;
91 if (dev->field_out == V4L2_FIELD_ALTERNATE) {
92 /*
93 * The sequence counter counts frames, not fields.
94 * So divide by two.
95 */
96 vid_out_buf->vb.sequence /= 2;
97 }
98 vid_out_buf->vb.vb2_buf.timestamp =
99 ktime_get_ns() + dev->time_wrap_offset;
100 vb2_buffer_done(&vid_out_buf->vb.vb2_buf, dev->dqbuf_error ?
101 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
102 dprintk(dev, 2, "vid_out buffer %d done\n",
103 vid_out_buf->vb.vb2_buf.index);
104 }
105
106 if (vbi_out_buf) {
107 v4l2_ctrl_request_setup(vbi_out_buf->vb.vb2_buf.req_obj.req,
108 &dev->ctrl_hdl_vbi_out);
109 v4l2_ctrl_request_complete(vbi_out_buf->vb.vb2_buf.req_obj.req,
110 &dev->ctrl_hdl_vbi_out);
111 if (dev->stream_sliced_vbi_out)
112 vivid_sliced_vbi_out_process(dev, vbi_out_buf);
113
114 vbi_out_buf->vb.sequence = dev->vbi_out_seq_count;
115 vbi_out_buf->vb.vb2_buf.timestamp =
116 ktime_get_ns() + dev->time_wrap_offset;
117 vb2_buffer_done(&vbi_out_buf->vb.vb2_buf, dev->dqbuf_error ?
118 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
119 dprintk(dev, 2, "vbi_out buffer %d done\n",
120 vbi_out_buf->vb.vb2_buf.index);
121 }
122 if (meta_out_buf) {
123 v4l2_ctrl_request_setup(meta_out_buf->vb.vb2_buf.req_obj.req,
124 &dev->ctrl_hdl_meta_out);
125 v4l2_ctrl_request_complete(meta_out_buf->vb.vb2_buf.req_obj.req,
126 &dev->ctrl_hdl_meta_out);
127 vivid_meta_out_process(dev, meta_out_buf);
128 meta_out_buf->vb.sequence = dev->meta_out_seq_count;
129 meta_out_buf->vb.vb2_buf.timestamp =
130 ktime_get_ns() + dev->time_wrap_offset;
131 vb2_buffer_done(&meta_out_buf->vb.vb2_buf, dev->dqbuf_error ?
132 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
133 dprintk(dev, 2, "meta_out buffer %d done\n",
134 meta_out_buf->vb.vb2_buf.index);
135 }
136
137 dev->dqbuf_error = false;
138 }
139
vivid_thread_vid_out(void * data)140 static int vivid_thread_vid_out(void *data)
141 {
142 struct vivid_dev *dev = data;
143 u64 numerators_since_start;
144 u64 buffers_since_start;
145 u64 next_jiffies_since_start;
146 unsigned long jiffies_since_start;
147 unsigned long cur_jiffies;
148 unsigned wait_jiffies;
149 unsigned numerator;
150 unsigned denominator;
151
152 dprintk(dev, 1, "Video Output Thread Start\n");
153
154 set_freezable();
155
156 /* Resets frame counters */
157 dev->out_seq_offset = 0;
158 dev->out_seq_count = 0;
159 dev->jiffies_vid_out = jiffies;
160 dev->out_seq_resync = false;
161 if (dev->time_wrap)
162 dev->time_wrap_offset = dev->time_wrap - ktime_get_ns();
163 else
164 dev->time_wrap_offset = 0;
165
166 for (;;) {
167 try_to_freeze();
168 if (kthread_should_stop())
169 break;
170
171 if (!mutex_trylock(&dev->mutex)) {
172 schedule();
173 continue;
174 }
175
176 cur_jiffies = jiffies;
177 if (dev->out_seq_resync) {
178 dev->jiffies_vid_out = cur_jiffies;
179 dev->out_seq_offset = dev->out_seq_count + 1;
180 dev->out_seq_count = 0;
181 dev->out_seq_resync = false;
182 }
183 numerator = dev->timeperframe_vid_out.numerator;
184 denominator = dev->timeperframe_vid_out.denominator;
185
186 if (dev->field_out == V4L2_FIELD_ALTERNATE)
187 denominator *= 2;
188
189 /* Calculate the number of jiffies since we started streaming */
190 jiffies_since_start = cur_jiffies - dev->jiffies_vid_out;
191 /* Get the number of buffers streamed since the start */
192 buffers_since_start = (u64)jiffies_since_start * denominator +
193 (HZ * numerator) / 2;
194 do_div(buffers_since_start, HZ * numerator);
195
196 /*
197 * After more than 0xf0000000 (rounded down to a multiple of
198 * 'jiffies-per-day' to ease jiffies_to_msecs calculation)
199 * jiffies have passed since we started streaming reset the
200 * counters and keep track of the sequence offset.
201 */
202 if (jiffies_since_start > JIFFIES_RESYNC) {
203 dev->jiffies_vid_out = cur_jiffies;
204 dev->out_seq_offset = buffers_since_start;
205 buffers_since_start = 0;
206 }
207 dev->out_seq_count = buffers_since_start + dev->out_seq_offset;
208 dev->vid_out_seq_count = dev->out_seq_count - dev->vid_out_seq_start;
209 dev->vbi_out_seq_count = dev->out_seq_count - dev->vbi_out_seq_start;
210 dev->meta_out_seq_count = dev->out_seq_count - dev->meta_out_seq_start;
211
212 vivid_thread_vid_out_tick(dev);
213 mutex_unlock(&dev->mutex);
214
215 /*
216 * Calculate the number of 'numerators' streamed since we started,
217 * not including the current buffer.
218 */
219 numerators_since_start = buffers_since_start * numerator;
220
221 /* And the number of jiffies since we started */
222 jiffies_since_start = jiffies - dev->jiffies_vid_out;
223
224 /* Increase by the 'numerator' of one buffer */
225 numerators_since_start += numerator;
226 /*
227 * Calculate when that next buffer is supposed to start
228 * in jiffies since we started streaming.
229 */
230 next_jiffies_since_start = numerators_since_start * HZ +
231 denominator / 2;
232 do_div(next_jiffies_since_start, denominator);
233 /* If it is in the past, then just schedule asap */
234 if (next_jiffies_since_start < jiffies_since_start)
235 next_jiffies_since_start = jiffies_since_start;
236
237 wait_jiffies = next_jiffies_since_start - jiffies_since_start;
238 while (time_is_after_jiffies(cur_jiffies + wait_jiffies) &&
239 !kthread_should_stop())
240 schedule();
241 }
242 dprintk(dev, 1, "Video Output Thread End\n");
243 return 0;
244 }
245
vivid_grab_controls(struct vivid_dev * dev,bool grab)246 static void vivid_grab_controls(struct vivid_dev *dev, bool grab)
247 {
248 v4l2_ctrl_grab(dev->ctrl_has_crop_out, grab);
249 v4l2_ctrl_grab(dev->ctrl_has_compose_out, grab);
250 v4l2_ctrl_grab(dev->ctrl_has_scaler_out, grab);
251 v4l2_ctrl_grab(dev->ctrl_tx_mode, grab);
252 v4l2_ctrl_grab(dev->ctrl_tx_rgb_range, grab);
253 }
254
vivid_start_generating_vid_out(struct vivid_dev * dev,bool * pstreaming)255 int vivid_start_generating_vid_out(struct vivid_dev *dev, bool *pstreaming)
256 {
257 dprintk(dev, 1, "%s\n", __func__);
258
259 if (dev->kthread_vid_out) {
260 u32 seq_count = dev->out_seq_count + dev->seq_wrap * 128;
261
262 if (pstreaming == &dev->vid_out_streaming)
263 dev->vid_out_seq_start = seq_count;
264 else if (pstreaming == &dev->vbi_out_streaming)
265 dev->vbi_out_seq_start = seq_count;
266 else
267 dev->meta_out_seq_start = seq_count;
268 *pstreaming = true;
269 return 0;
270 }
271
272 /* Resets frame counters */
273 dev->jiffies_vid_out = jiffies;
274 dev->vid_out_seq_start = dev->seq_wrap * 128;
275 dev->vbi_out_seq_start = dev->seq_wrap * 128;
276 dev->meta_out_seq_start = dev->seq_wrap * 128;
277
278 dev->kthread_vid_out = kthread_run(vivid_thread_vid_out, dev,
279 "%s-vid-out", dev->v4l2_dev.name);
280
281 if (IS_ERR(dev->kthread_vid_out)) {
282 int err = PTR_ERR(dev->kthread_vid_out);
283
284 dev->kthread_vid_out = NULL;
285 v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
286 return err;
287 }
288 *pstreaming = true;
289 vivid_grab_controls(dev, true);
290
291 dprintk(dev, 1, "returning from %s\n", __func__);
292 return 0;
293 }
294
vivid_stop_generating_vid_out(struct vivid_dev * dev,bool * pstreaming)295 void vivid_stop_generating_vid_out(struct vivid_dev *dev, bool *pstreaming)
296 {
297 dprintk(dev, 1, "%s\n", __func__);
298
299 if (dev->kthread_vid_out == NULL)
300 return;
301
302 *pstreaming = false;
303 if (pstreaming == &dev->vid_out_streaming) {
304 /* Release all active buffers */
305 while (!list_empty(&dev->vid_out_active)) {
306 struct vivid_buffer *buf;
307
308 buf = list_entry(dev->vid_out_active.next,
309 struct vivid_buffer, list);
310 list_del(&buf->list);
311 v4l2_ctrl_request_complete(buf->vb.vb2_buf.req_obj.req,
312 &dev->ctrl_hdl_vid_out);
313 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
314 dprintk(dev, 2, "vid_out buffer %d done\n",
315 buf->vb.vb2_buf.index);
316 }
317 }
318
319 if (pstreaming == &dev->vbi_out_streaming) {
320 while (!list_empty(&dev->vbi_out_active)) {
321 struct vivid_buffer *buf;
322
323 buf = list_entry(dev->vbi_out_active.next,
324 struct vivid_buffer, list);
325 list_del(&buf->list);
326 v4l2_ctrl_request_complete(buf->vb.vb2_buf.req_obj.req,
327 &dev->ctrl_hdl_vbi_out);
328 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
329 dprintk(dev, 2, "vbi_out buffer %d done\n",
330 buf->vb.vb2_buf.index);
331 }
332 }
333
334 if (pstreaming == &dev->meta_out_streaming) {
335 while (!list_empty(&dev->meta_out_active)) {
336 struct vivid_buffer *buf;
337
338 buf = list_entry(dev->meta_out_active.next,
339 struct vivid_buffer, list);
340 list_del(&buf->list);
341 v4l2_ctrl_request_complete(buf->vb.vb2_buf.req_obj.req,
342 &dev->ctrl_hdl_meta_out);
343 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
344 dprintk(dev, 2, "meta_out buffer %d done\n",
345 buf->vb.vb2_buf.index);
346 }
347 }
348
349 if (dev->vid_out_streaming || dev->vbi_out_streaming ||
350 dev->meta_out_streaming)
351 return;
352
353 /* shutdown control thread */
354 vivid_grab_controls(dev, false);
355 kthread_stop(dev->kthread_vid_out);
356 dev->kthread_vid_out = NULL;
357 }
358