Back to home page

OSCL-LXR
 
 

     

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Memory-to-memory device framework for Video for Linux 2 and videobuf.
0004  *
0005  * Helper functions for devices that use videobuf buffers for both their
0006  * source and destination.
0007  *
0008  * Copyright (c) 2009-2010 Samsung Electronics Co., Ltd.
0009  * Pawel Osciak, <pawel@osciak.com>
0010  * Marek Szyprowski, <m.szyprowski@samsung.com>
0011  */
0012 #include <linux/module.h>
0013 #include <linux/sched.h>
0014 #include <linux/slab.h>
0015 
0016 #include <media/media-device.h>
0017 #include <media/videobuf2-v4l2.h>
0018 #include <media/v4l2-mem2mem.h>
0019 #include <media/v4l2-dev.h>
0020 #include <media/v4l2-device.h>
0021 #include <media/v4l2-fh.h>
0022 #include <media/v4l2-event.h>
0023 
0024 MODULE_DESCRIPTION("Mem to mem device framework for videobuf");
0025 MODULE_AUTHOR("Pawel Osciak, <pawel@osciak.com>");
0026 MODULE_LICENSE("GPL");
0027 
0028 static bool debug;
0029 module_param(debug, bool, 0644);
0030 
0031 #define dprintk(fmt, arg...)                        \
0032     do {                                \
0033         if (debug)                      \
0034             printk(KERN_DEBUG "%s: " fmt, __func__, ## arg);\
0035     } while (0)
0036 
0037 
0038 /* Instance is already queued on the job_queue */
0039 #define TRANS_QUEUED        (1 << 0)
0040 /* Instance is currently running in hardware */
0041 #define TRANS_RUNNING       (1 << 1)
0042 /* Instance is currently aborting */
0043 #define TRANS_ABORT     (1 << 2)
0044 
0045 
0046 /* The job queue is not running new jobs */
0047 #define QUEUE_PAUSED        (1 << 0)
0048 
0049 
0050 /* Offset base for buffers on the destination queue - used to distinguish
0051  * between source and destination buffers when mmapping - they receive the same
0052  * offsets but for different queues */
0053 #define DST_QUEUE_OFF_BASE  (1 << 30)
0054 
0055 enum v4l2_m2m_entity_type {
0056     MEM2MEM_ENT_TYPE_SOURCE,
0057     MEM2MEM_ENT_TYPE_SINK,
0058     MEM2MEM_ENT_TYPE_PROC
0059 };
0060 
0061 static const char * const m2m_entity_name[] = {
0062     "source",
0063     "sink",
0064     "proc"
0065 };
0066 
0067 /**
0068  * struct v4l2_m2m_dev - per-device context
0069  * @source:     &struct media_entity pointer with the source entity
0070  *          Used only when the M2M device is registered via
0071  *          v4l2_m2m_register_media_controller().
0072  * @source_pad:     &struct media_pad with the source pad.
0073  *          Used only when the M2M device is registered via
0074  *          v4l2_m2m_register_media_controller().
0075  * @sink:       &struct media_entity pointer with the sink entity
0076  *          Used only when the M2M device is registered via
0077  *          v4l2_m2m_register_media_controller().
0078  * @sink_pad:       &struct media_pad with the sink pad.
0079  *          Used only when the M2M device is registered via
0080  *          v4l2_m2m_register_media_controller().
0081  * @proc:       &struct media_entity pointer with the M2M device itself.
0082  * @proc_pads:      &struct media_pad with the @proc pads.
0083  *          Used only when the M2M device is registered via
0084  *          v4l2_m2m_unregister_media_controller().
0085  * @intf_devnode:   &struct media_intf devnode pointer with the interface
0086  *          with controls the M2M device.
0087  * @curr_ctx:       currently running instance
0088  * @job_queue:      instances queued to run
0089  * @job_spinlock:   protects job_queue
0090  * @job_work:       worker to run queued jobs.
0091  * @job_queue_flags:    flags of the queue status, %QUEUE_PAUSED.
0092  * @m2m_ops:        driver callbacks
0093  */
0094 struct v4l2_m2m_dev {
0095     struct v4l2_m2m_ctx *curr_ctx;
0096 #ifdef CONFIG_MEDIA_CONTROLLER
0097     struct media_entity *source;
0098     struct media_pad    source_pad;
0099     struct media_entity sink;
0100     struct media_pad    sink_pad;
0101     struct media_entity proc;
0102     struct media_pad    proc_pads[2];
0103     struct media_intf_devnode *intf_devnode;
0104 #endif
0105 
0106     struct list_head    job_queue;
0107     spinlock_t      job_spinlock;
0108     struct work_struct  job_work;
0109     unsigned long       job_queue_flags;
0110 
0111     const struct v4l2_m2m_ops *m2m_ops;
0112 };
0113 
0114 static struct v4l2_m2m_queue_ctx *get_queue_ctx(struct v4l2_m2m_ctx *m2m_ctx,
0115                         enum v4l2_buf_type type)
0116 {
0117     if (V4L2_TYPE_IS_OUTPUT(type))
0118         return &m2m_ctx->out_q_ctx;
0119     else
0120         return &m2m_ctx->cap_q_ctx;
0121 }
0122 
0123 struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx,
0124                        enum v4l2_buf_type type)
0125 {
0126     struct v4l2_m2m_queue_ctx *q_ctx;
0127 
0128     q_ctx = get_queue_ctx(m2m_ctx, type);
0129     if (!q_ctx)
0130         return NULL;
0131 
0132     return &q_ctx->q;
0133 }
0134 EXPORT_SYMBOL(v4l2_m2m_get_vq);
0135 
0136 struct vb2_v4l2_buffer *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx)
0137 {
0138     struct v4l2_m2m_buffer *b;
0139     unsigned long flags;
0140 
0141     spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
0142 
0143     if (list_empty(&q_ctx->rdy_queue)) {
0144         spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
0145         return NULL;
0146     }
0147 
0148     b = list_first_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list);
0149     spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
0150     return &b->vb;
0151 }
0152 EXPORT_SYMBOL_GPL(v4l2_m2m_next_buf);
0153 
0154 struct vb2_v4l2_buffer *v4l2_m2m_last_buf(struct v4l2_m2m_queue_ctx *q_ctx)
0155 {
0156     struct v4l2_m2m_buffer *b;
0157     unsigned long flags;
0158 
0159     spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
0160 
0161     if (list_empty(&q_ctx->rdy_queue)) {
0162         spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
0163         return NULL;
0164     }
0165 
0166     b = list_last_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list);
0167     spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
0168     return &b->vb;
0169 }
0170 EXPORT_SYMBOL_GPL(v4l2_m2m_last_buf);
0171 
0172 struct vb2_v4l2_buffer *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx)
0173 {
0174     struct v4l2_m2m_buffer *b;
0175     unsigned long flags;
0176 
0177     spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
0178     if (list_empty(&q_ctx->rdy_queue)) {
0179         spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
0180         return NULL;
0181     }
0182     b = list_first_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list);
0183     list_del(&b->list);
0184     q_ctx->num_rdy--;
0185     spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
0186 
0187     return &b->vb;
0188 }
0189 EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove);
0190 
0191 void v4l2_m2m_buf_remove_by_buf(struct v4l2_m2m_queue_ctx *q_ctx,
0192                 struct vb2_v4l2_buffer *vbuf)
0193 {
0194     struct v4l2_m2m_buffer *b;
0195     unsigned long flags;
0196 
0197     spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
0198     b = container_of(vbuf, struct v4l2_m2m_buffer, vb);
0199     list_del(&b->list);
0200     q_ctx->num_rdy--;
0201     spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
0202 }
0203 EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove_by_buf);
0204 
0205 struct vb2_v4l2_buffer *
0206 v4l2_m2m_buf_remove_by_idx(struct v4l2_m2m_queue_ctx *q_ctx, unsigned int idx)
0207 
0208 {
0209     struct v4l2_m2m_buffer *b, *tmp;
0210     struct vb2_v4l2_buffer *ret = NULL;
0211     unsigned long flags;
0212 
0213     spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
0214     list_for_each_entry_safe(b, tmp, &q_ctx->rdy_queue, list) {
0215         if (b->vb.vb2_buf.index == idx) {
0216             list_del(&b->list);
0217             q_ctx->num_rdy--;
0218             ret = &b->vb;
0219             break;
0220         }
0221     }
0222     spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
0223 
0224     return ret;
0225 }
0226 EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove_by_idx);
0227 
0228 /*
0229  * Scheduling handlers
0230  */
0231 
0232 void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev)
0233 {
0234     unsigned long flags;
0235     void *ret = NULL;
0236 
0237     spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
0238     if (m2m_dev->curr_ctx)
0239         ret = m2m_dev->curr_ctx->priv;
0240     spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
0241 
0242     return ret;
0243 }
0244 EXPORT_SYMBOL(v4l2_m2m_get_curr_priv);
0245 
0246 /**
0247  * v4l2_m2m_try_run() - select next job to perform and run it if possible
0248  * @m2m_dev: per-device context
0249  *
0250  * Get next transaction (if present) from the waiting jobs list and run it.
0251  *
0252  * Note that this function can run on a given v4l2_m2m_ctx context,
0253  * but call .device_run for another context.
0254  */
0255 static void v4l2_m2m_try_run(struct v4l2_m2m_dev *m2m_dev)
0256 {
0257     unsigned long flags;
0258 
0259     spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
0260     if (NULL != m2m_dev->curr_ctx) {
0261         spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
0262         dprintk("Another instance is running, won't run now\n");
0263         return;
0264     }
0265 
0266     if (list_empty(&m2m_dev->job_queue)) {
0267         spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
0268         dprintk("No job pending\n");
0269         return;
0270     }
0271 
0272     if (m2m_dev->job_queue_flags & QUEUE_PAUSED) {
0273         spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
0274         dprintk("Running new jobs is paused\n");
0275         return;
0276     }
0277 
0278     m2m_dev->curr_ctx = list_first_entry(&m2m_dev->job_queue,
0279                    struct v4l2_m2m_ctx, queue);
0280     m2m_dev->curr_ctx->job_flags |= TRANS_RUNNING;
0281     spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
0282 
0283     dprintk("Running job on m2m_ctx: %p\n", m2m_dev->curr_ctx);
0284     m2m_dev->m2m_ops->device_run(m2m_dev->curr_ctx->priv);
0285 }
0286 
0287 /*
0288  * __v4l2_m2m_try_queue() - queue a job
0289  * @m2m_dev: m2m device
0290  * @m2m_ctx: m2m context
0291  *
0292  * Check if this context is ready to queue a job.
0293  *
0294  * This function can run in interrupt context.
0295  */
0296 static void __v4l2_m2m_try_queue(struct v4l2_m2m_dev *m2m_dev,
0297                  struct v4l2_m2m_ctx *m2m_ctx)
0298 {
0299     unsigned long flags_job;
0300     struct vb2_v4l2_buffer *dst, *src;
0301 
0302     dprintk("Trying to schedule a job for m2m_ctx: %p\n", m2m_ctx);
0303 
0304     if (!m2m_ctx->out_q_ctx.q.streaming
0305         || !m2m_ctx->cap_q_ctx.q.streaming) {
0306         dprintk("Streaming needs to be on for both queues\n");
0307         return;
0308     }
0309 
0310     spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job);
0311 
0312     /* If the context is aborted then don't schedule it */
0313     if (m2m_ctx->job_flags & TRANS_ABORT) {
0314         dprintk("Aborted context\n");
0315         goto job_unlock;
0316     }
0317 
0318     if (m2m_ctx->job_flags & TRANS_QUEUED) {
0319         dprintk("On job queue already\n");
0320         goto job_unlock;
0321     }
0322 
0323     src = v4l2_m2m_next_src_buf(m2m_ctx);
0324     dst = v4l2_m2m_next_dst_buf(m2m_ctx);
0325     if (!src && !m2m_ctx->out_q_ctx.buffered) {
0326         dprintk("No input buffers available\n");
0327         goto job_unlock;
0328     }
0329     if (!dst && !m2m_ctx->cap_q_ctx.buffered) {
0330         dprintk("No output buffers available\n");
0331         goto job_unlock;
0332     }
0333 
0334     m2m_ctx->new_frame = true;
0335 
0336     if (src && dst && dst->is_held &&
0337         dst->vb2_buf.copied_timestamp &&
0338         dst->vb2_buf.timestamp != src->vb2_buf.timestamp) {
0339         dprintk("Timestamp mismatch, returning held capture buffer\n");
0340         dst->is_held = false;
0341         v4l2_m2m_dst_buf_remove(m2m_ctx);
0342         v4l2_m2m_buf_done(dst, VB2_BUF_STATE_DONE);
0343         dst = v4l2_m2m_next_dst_buf(m2m_ctx);
0344 
0345         if (!dst && !m2m_ctx->cap_q_ctx.buffered) {
0346             dprintk("No output buffers available after returning held buffer\n");
0347             goto job_unlock;
0348         }
0349     }
0350 
0351     if (src && dst && (m2m_ctx->out_q_ctx.q.subsystem_flags &
0352                VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF))
0353         m2m_ctx->new_frame = !dst->vb2_buf.copied_timestamp ||
0354             dst->vb2_buf.timestamp != src->vb2_buf.timestamp;
0355 
0356     if (m2m_ctx->has_stopped) {
0357         dprintk("Device has stopped\n");
0358         goto job_unlock;
0359     }
0360 
0361     if (m2m_dev->m2m_ops->job_ready
0362         && (!m2m_dev->m2m_ops->job_ready(m2m_ctx->priv))) {
0363         dprintk("Driver not ready\n");
0364         goto job_unlock;
0365     }
0366 
0367     list_add_tail(&m2m_ctx->queue, &m2m_dev->job_queue);
0368     m2m_ctx->job_flags |= TRANS_QUEUED;
0369 
0370 job_unlock:
0371     spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
0372 }
0373 
0374 /**
0375  * v4l2_m2m_try_schedule() - schedule and possibly run a job for any context
0376  * @m2m_ctx: m2m context
0377  *
0378  * Check if this context is ready to queue a job. If suitable,
0379  * run the next queued job on the mem2mem device.
0380  *
0381  * This function shouldn't run in interrupt context.
0382  *
0383  * Note that v4l2_m2m_try_schedule() can schedule one job for this context,
0384  * and then run another job for another context.
0385  */
0386 void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx)
0387 {
0388     struct v4l2_m2m_dev *m2m_dev = m2m_ctx->m2m_dev;
0389 
0390     __v4l2_m2m_try_queue(m2m_dev, m2m_ctx);
0391     v4l2_m2m_try_run(m2m_dev);
0392 }
0393 EXPORT_SYMBOL_GPL(v4l2_m2m_try_schedule);
0394 
0395 /**
0396  * v4l2_m2m_device_run_work() - run pending jobs for the context
0397  * @work: Work structure used for scheduling the execution of this function.
0398  */
0399 static void v4l2_m2m_device_run_work(struct work_struct *work)
0400 {
0401     struct v4l2_m2m_dev *m2m_dev =
0402         container_of(work, struct v4l2_m2m_dev, job_work);
0403 
0404     v4l2_m2m_try_run(m2m_dev);
0405 }
0406 
0407 /**
0408  * v4l2_m2m_cancel_job() - cancel pending jobs for the context
0409  * @m2m_ctx: m2m context with jobs to be canceled
0410  *
0411  * In case of streamoff or release called on any context,
0412  * 1] If the context is currently running, then abort job will be called
0413  * 2] If the context is queued, then the context will be removed from
0414  *    the job_queue
0415  */
0416 static void v4l2_m2m_cancel_job(struct v4l2_m2m_ctx *m2m_ctx)
0417 {
0418     struct v4l2_m2m_dev *m2m_dev;
0419     unsigned long flags;
0420 
0421     m2m_dev = m2m_ctx->m2m_dev;
0422     spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
0423 
0424     m2m_ctx->job_flags |= TRANS_ABORT;
0425     if (m2m_ctx->job_flags & TRANS_RUNNING) {
0426         spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
0427         if (m2m_dev->m2m_ops->job_abort)
0428             m2m_dev->m2m_ops->job_abort(m2m_ctx->priv);
0429         dprintk("m2m_ctx %p running, will wait to complete\n", m2m_ctx);
0430         wait_event(m2m_ctx->finished,
0431                 !(m2m_ctx->job_flags & TRANS_RUNNING));
0432     } else if (m2m_ctx->job_flags & TRANS_QUEUED) {
0433         list_del(&m2m_ctx->queue);
0434         m2m_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING);
0435         spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
0436         dprintk("m2m_ctx: %p had been on queue and was removed\n",
0437             m2m_ctx);
0438     } else {
0439         /* Do nothing, was not on queue/running */
0440         spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
0441     }
0442 }
0443 
0444 /*
0445  * Schedule the next job, called from v4l2_m2m_job_finish() or
0446  * v4l2_m2m_buf_done_and_job_finish().
0447  */
0448 static void v4l2_m2m_schedule_next_job(struct v4l2_m2m_dev *m2m_dev,
0449                        struct v4l2_m2m_ctx *m2m_ctx)
0450 {
0451     /*
0452      * This instance might have more buffers ready, but since we do not
0453      * allow more than one job on the job_queue per instance, each has
0454      * to be scheduled separately after the previous one finishes.
0455      */
0456     __v4l2_m2m_try_queue(m2m_dev, m2m_ctx);
0457 
0458     /*
0459      * We might be running in atomic context,
0460      * but the job must be run in non-atomic context.
0461      */
0462     schedule_work(&m2m_dev->job_work);
0463 }
0464 
0465 /*
0466  * Assumes job_spinlock is held, called from v4l2_m2m_job_finish() or
0467  * v4l2_m2m_buf_done_and_job_finish().
0468  */
0469 static bool _v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
0470                  struct v4l2_m2m_ctx *m2m_ctx)
0471 {
0472     if (!m2m_dev->curr_ctx || m2m_dev->curr_ctx != m2m_ctx) {
0473         dprintk("Called by an instance not currently running\n");
0474         return false;
0475     }
0476 
0477     list_del(&m2m_dev->curr_ctx->queue);
0478     m2m_dev->curr_ctx->job_flags &= ~(TRANS_QUEUED | TRANS_RUNNING);
0479     wake_up(&m2m_dev->curr_ctx->finished);
0480     m2m_dev->curr_ctx = NULL;
0481     return true;
0482 }
0483 
0484 void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
0485              struct v4l2_m2m_ctx *m2m_ctx)
0486 {
0487     unsigned long flags;
0488     bool schedule_next;
0489 
0490     /*
0491      * This function should not be used for drivers that support
0492      * holding capture buffers. Those should use
0493      * v4l2_m2m_buf_done_and_job_finish() instead.
0494      */
0495     WARN_ON(m2m_ctx->out_q_ctx.q.subsystem_flags &
0496         VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF);
0497     spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
0498     schedule_next = _v4l2_m2m_job_finish(m2m_dev, m2m_ctx);
0499     spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
0500 
0501     if (schedule_next)
0502         v4l2_m2m_schedule_next_job(m2m_dev, m2m_ctx);
0503 }
0504 EXPORT_SYMBOL(v4l2_m2m_job_finish);
0505 
0506 void v4l2_m2m_buf_done_and_job_finish(struct v4l2_m2m_dev *m2m_dev,
0507                       struct v4l2_m2m_ctx *m2m_ctx,
0508                       enum vb2_buffer_state state)
0509 {
0510     struct vb2_v4l2_buffer *src_buf, *dst_buf;
0511     bool schedule_next = false;
0512     unsigned long flags;
0513 
0514     spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
0515     src_buf = v4l2_m2m_src_buf_remove(m2m_ctx);
0516     dst_buf = v4l2_m2m_next_dst_buf(m2m_ctx);
0517 
0518     if (WARN_ON(!src_buf || !dst_buf))
0519         goto unlock;
0520     dst_buf->is_held = src_buf->flags & V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF;
0521     if (!dst_buf->is_held) {
0522         v4l2_m2m_dst_buf_remove(m2m_ctx);
0523         v4l2_m2m_buf_done(dst_buf, state);
0524     }
0525     /*
0526      * If the request API is being used, returning the OUTPUT
0527      * (src) buffer will wake-up any process waiting on the
0528      * request file descriptor.
0529      *
0530      * Therefore, return the CAPTURE (dst) buffer first,
0531      * to avoid signalling the request file descriptor
0532      * before the CAPTURE buffer is done.
0533      */
0534     v4l2_m2m_buf_done(src_buf, state);
0535     schedule_next = _v4l2_m2m_job_finish(m2m_dev, m2m_ctx);
0536 unlock:
0537     spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
0538 
0539     if (schedule_next)
0540         v4l2_m2m_schedule_next_job(m2m_dev, m2m_ctx);
0541 }
0542 EXPORT_SYMBOL(v4l2_m2m_buf_done_and_job_finish);
0543 
0544 void v4l2_m2m_suspend(struct v4l2_m2m_dev *m2m_dev)
0545 {
0546     unsigned long flags;
0547     struct v4l2_m2m_ctx *curr_ctx;
0548 
0549     spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
0550     m2m_dev->job_queue_flags |= QUEUE_PAUSED;
0551     curr_ctx = m2m_dev->curr_ctx;
0552     spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
0553 
0554     if (curr_ctx)
0555         wait_event(curr_ctx->finished,
0556                !(curr_ctx->job_flags & TRANS_RUNNING));
0557 }
0558 EXPORT_SYMBOL(v4l2_m2m_suspend);
0559 
0560 void v4l2_m2m_resume(struct v4l2_m2m_dev *m2m_dev)
0561 {
0562     unsigned long flags;
0563 
0564     spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
0565     m2m_dev->job_queue_flags &= ~QUEUE_PAUSED;
0566     spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
0567 
0568     v4l2_m2m_try_run(m2m_dev);
0569 }
0570 EXPORT_SYMBOL(v4l2_m2m_resume);
0571 
0572 int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
0573              struct v4l2_requestbuffers *reqbufs)
0574 {
0575     struct vb2_queue *vq;
0576     int ret;
0577 
0578     vq = v4l2_m2m_get_vq(m2m_ctx, reqbufs->type);
0579     ret = vb2_reqbufs(vq, reqbufs);
0580     /* If count == 0, then the owner has released all buffers and he
0581        is no longer owner of the queue. Otherwise we have an owner. */
0582     if (ret == 0)
0583         vq->owner = reqbufs->count ? file->private_data : NULL;
0584 
0585     return ret;
0586 }
0587 EXPORT_SYMBOL_GPL(v4l2_m2m_reqbufs);
0588 
0589 static void v4l2_m2m_adjust_mem_offset(struct vb2_queue *vq,
0590                        struct v4l2_buffer *buf)
0591 {
0592     /* Adjust MMAP memory offsets for the CAPTURE queue */
0593     if (buf->memory == V4L2_MEMORY_MMAP && V4L2_TYPE_IS_CAPTURE(vq->type)) {
0594         if (V4L2_TYPE_IS_MULTIPLANAR(vq->type)) {
0595             unsigned int i;
0596 
0597             for (i = 0; i < buf->length; ++i)
0598                 buf->m.planes[i].m.mem_offset
0599                     += DST_QUEUE_OFF_BASE;
0600         } else {
0601             buf->m.offset += DST_QUEUE_OFF_BASE;
0602         }
0603     }
0604 }
0605 
0606 int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
0607               struct v4l2_buffer *buf)
0608 {
0609     struct vb2_queue *vq;
0610     int ret;
0611 
0612     vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
0613     ret = vb2_querybuf(vq, buf);
0614     if (ret)
0615         return ret;
0616 
0617     /* Adjust MMAP memory offsets for the CAPTURE queue */
0618     v4l2_m2m_adjust_mem_offset(vq, buf);
0619 
0620     return 0;
0621 }
0622 EXPORT_SYMBOL_GPL(v4l2_m2m_querybuf);
0623 
0624 /*
0625  * This will add the LAST flag and mark the buffer management
0626  * state as stopped.
0627  * This is called when the last capture buffer must be flagged as LAST
0628  * in draining mode from the encoder/decoder driver buf_queue() callback
0629  * or from v4l2_update_last_buf_state() when a capture buffer is available.
0630  */
0631 void v4l2_m2m_last_buffer_done(struct v4l2_m2m_ctx *m2m_ctx,
0632                    struct vb2_v4l2_buffer *vbuf)
0633 {
0634     vbuf->flags |= V4L2_BUF_FLAG_LAST;
0635     vb2_buffer_done(&vbuf->vb2_buf, VB2_BUF_STATE_DONE);
0636 
0637     v4l2_m2m_mark_stopped(m2m_ctx);
0638 }
0639 EXPORT_SYMBOL_GPL(v4l2_m2m_last_buffer_done);
0640 
0641 /* When stop command is issued, update buffer management state */
0642 static int v4l2_update_last_buf_state(struct v4l2_m2m_ctx *m2m_ctx)
0643 {
0644     struct vb2_v4l2_buffer *next_dst_buf;
0645 
0646     if (m2m_ctx->is_draining)
0647         return -EBUSY;
0648 
0649     if (m2m_ctx->has_stopped)
0650         return 0;
0651 
0652     m2m_ctx->last_src_buf = v4l2_m2m_last_src_buf(m2m_ctx);
0653     m2m_ctx->is_draining = true;
0654 
0655     /*
0656      * The processing of the last output buffer queued before
0657      * the STOP command is expected to mark the buffer management
0658      * state as stopped with v4l2_m2m_mark_stopped().
0659      */
0660     if (m2m_ctx->last_src_buf)
0661         return 0;
0662 
0663     /*
0664      * In case the output queue is empty, try to mark the last capture
0665      * buffer as LAST.
0666      */
0667     next_dst_buf = v4l2_m2m_dst_buf_remove(m2m_ctx);
0668     if (!next_dst_buf) {
0669         /*
0670          * Wait for the next queued one in encoder/decoder driver
0671          * buf_queue() callback using the v4l2_m2m_dst_buf_is_last()
0672          * helper or in v4l2_m2m_qbuf() if encoder/decoder is not yet
0673          * streaming.
0674          */
0675         m2m_ctx->next_buf_last = true;
0676         return 0;
0677     }
0678 
0679     v4l2_m2m_last_buffer_done(m2m_ctx, next_dst_buf);
0680 
0681     return 0;
0682 }
0683 
0684 /*
0685  * Updates the encoding/decoding buffer management state, should
0686  * be called from encoder/decoder drivers start_streaming()
0687  */
0688 void v4l2_m2m_update_start_streaming_state(struct v4l2_m2m_ctx *m2m_ctx,
0689                        struct vb2_queue *q)
0690 {
0691     /* If start streaming again, untag the last output buffer */
0692     if (V4L2_TYPE_IS_OUTPUT(q->type))
0693         m2m_ctx->last_src_buf = NULL;
0694 }
0695 EXPORT_SYMBOL_GPL(v4l2_m2m_update_start_streaming_state);
0696 
0697 /*
0698  * Updates the encoding/decoding buffer management state, should
0699  * be called from encoder/decoder driver stop_streaming()
0700  */
0701 void v4l2_m2m_update_stop_streaming_state(struct v4l2_m2m_ctx *m2m_ctx,
0702                       struct vb2_queue *q)
0703 {
0704     if (V4L2_TYPE_IS_OUTPUT(q->type)) {
0705         /*
0706          * If in draining state, either mark next dst buffer as
0707          * done or flag next one to be marked as done either
0708          * in encoder/decoder driver buf_queue() callback using
0709          * the v4l2_m2m_dst_buf_is_last() helper or in v4l2_m2m_qbuf()
0710          * if encoder/decoder is not yet streaming
0711          */
0712         if (m2m_ctx->is_draining) {
0713             struct vb2_v4l2_buffer *next_dst_buf;
0714 
0715             m2m_ctx->last_src_buf = NULL;
0716             next_dst_buf = v4l2_m2m_dst_buf_remove(m2m_ctx);
0717             if (!next_dst_buf)
0718                 m2m_ctx->next_buf_last = true;
0719             else
0720                 v4l2_m2m_last_buffer_done(m2m_ctx,
0721                               next_dst_buf);
0722         }
0723     } else {
0724         v4l2_m2m_clear_state(m2m_ctx);
0725     }
0726 }
0727 EXPORT_SYMBOL_GPL(v4l2_m2m_update_stop_streaming_state);
0728 
0729 static void v4l2_m2m_force_last_buf_done(struct v4l2_m2m_ctx *m2m_ctx,
0730                      struct vb2_queue *q)
0731 {
0732     struct vb2_buffer *vb;
0733     struct vb2_v4l2_buffer *vbuf;
0734     unsigned int i;
0735 
0736     if (WARN_ON(q->is_output))
0737         return;
0738     if (list_empty(&q->queued_list))
0739         return;
0740 
0741     vb = list_first_entry(&q->queued_list, struct vb2_buffer, queued_entry);
0742     for (i = 0; i < vb->num_planes; i++)
0743         vb2_set_plane_payload(vb, i, 0);
0744 
0745     /*
0746      * Since the buffer hasn't been queued to the ready queue,
0747      * mark is active and owned before marking it LAST and DONE
0748      */
0749     vb->state = VB2_BUF_STATE_ACTIVE;
0750     atomic_inc(&q->owned_by_drv_count);
0751 
0752     vbuf = to_vb2_v4l2_buffer(vb);
0753     vbuf->field = V4L2_FIELD_NONE;
0754 
0755     v4l2_m2m_last_buffer_done(m2m_ctx, vbuf);
0756 }
0757 
0758 int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
0759           struct v4l2_buffer *buf)
0760 {
0761     struct video_device *vdev = video_devdata(file);
0762     struct vb2_queue *vq;
0763     int ret;
0764 
0765     vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
0766     if (V4L2_TYPE_IS_CAPTURE(vq->type) &&
0767         (buf->flags & V4L2_BUF_FLAG_REQUEST_FD)) {
0768         dprintk("%s: requests cannot be used with capture buffers\n",
0769             __func__);
0770         return -EPERM;
0771     }
0772 
0773     ret = vb2_qbuf(vq, vdev->v4l2_dev->mdev, buf);
0774     if (ret)
0775         return ret;
0776 
0777     /* Adjust MMAP memory offsets for the CAPTURE queue */
0778     v4l2_m2m_adjust_mem_offset(vq, buf);
0779 
0780     /*
0781      * If the capture queue is streaming, but streaming hasn't started
0782      * on the device, but was asked to stop, mark the previously queued
0783      * buffer as DONE with LAST flag since it won't be queued on the
0784      * device.
0785      */
0786     if (V4L2_TYPE_IS_CAPTURE(vq->type) &&
0787         vb2_is_streaming(vq) && !vb2_start_streaming_called(vq) &&
0788        (v4l2_m2m_has_stopped(m2m_ctx) || v4l2_m2m_dst_buf_is_last(m2m_ctx)))
0789         v4l2_m2m_force_last_buf_done(m2m_ctx, vq);
0790     else if (!(buf->flags & V4L2_BUF_FLAG_IN_REQUEST))
0791         v4l2_m2m_try_schedule(m2m_ctx);
0792 
0793     return 0;
0794 }
0795 EXPORT_SYMBOL_GPL(v4l2_m2m_qbuf);
0796 
0797 int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
0798            struct v4l2_buffer *buf)
0799 {
0800     struct vb2_queue *vq;
0801     int ret;
0802 
0803     vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
0804     ret = vb2_dqbuf(vq, buf, file->f_flags & O_NONBLOCK);
0805     if (ret)
0806         return ret;
0807 
0808     /* Adjust MMAP memory offsets for the CAPTURE queue */
0809     v4l2_m2m_adjust_mem_offset(vq, buf);
0810 
0811     return 0;
0812 }
0813 EXPORT_SYMBOL_GPL(v4l2_m2m_dqbuf);
0814 
0815 int v4l2_m2m_prepare_buf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
0816              struct v4l2_buffer *buf)
0817 {
0818     struct video_device *vdev = video_devdata(file);
0819     struct vb2_queue *vq;
0820     int ret;
0821 
0822     vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
0823     ret = vb2_prepare_buf(vq, vdev->v4l2_dev->mdev, buf);
0824     if (ret)
0825         return ret;
0826 
0827     /* Adjust MMAP memory offsets for the CAPTURE queue */
0828     v4l2_m2m_adjust_mem_offset(vq, buf);
0829 
0830     return 0;
0831 }
0832 EXPORT_SYMBOL_GPL(v4l2_m2m_prepare_buf);
0833 
0834 int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
0835              struct v4l2_create_buffers *create)
0836 {
0837     struct vb2_queue *vq;
0838 
0839     vq = v4l2_m2m_get_vq(m2m_ctx, create->format.type);
0840     return vb2_create_bufs(vq, create);
0841 }
0842 EXPORT_SYMBOL_GPL(v4l2_m2m_create_bufs);
0843 
0844 int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
0845           struct v4l2_exportbuffer *eb)
0846 {
0847     struct vb2_queue *vq;
0848 
0849     vq = v4l2_m2m_get_vq(m2m_ctx, eb->type);
0850     return vb2_expbuf(vq, eb);
0851 }
0852 EXPORT_SYMBOL_GPL(v4l2_m2m_expbuf);
0853 
0854 int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
0855               enum v4l2_buf_type type)
0856 {
0857     struct vb2_queue *vq;
0858     int ret;
0859 
0860     vq = v4l2_m2m_get_vq(m2m_ctx, type);
0861     ret = vb2_streamon(vq, type);
0862     if (!ret)
0863         v4l2_m2m_try_schedule(m2m_ctx);
0864 
0865     return ret;
0866 }
0867 EXPORT_SYMBOL_GPL(v4l2_m2m_streamon);
0868 
0869 int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
0870                enum v4l2_buf_type type)
0871 {
0872     struct v4l2_m2m_dev *m2m_dev;
0873     struct v4l2_m2m_queue_ctx *q_ctx;
0874     unsigned long flags_job, flags;
0875     int ret;
0876 
0877     /* wait until the current context is dequeued from job_queue */
0878     v4l2_m2m_cancel_job(m2m_ctx);
0879 
0880     q_ctx = get_queue_ctx(m2m_ctx, type);
0881     ret = vb2_streamoff(&q_ctx->q, type);
0882     if (ret)
0883         return ret;
0884 
0885     m2m_dev = m2m_ctx->m2m_dev;
0886     spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job);
0887     /* We should not be scheduled anymore, since we're dropping a queue. */
0888     if (m2m_ctx->job_flags & TRANS_QUEUED)
0889         list_del(&m2m_ctx->queue);
0890     m2m_ctx->job_flags = 0;
0891 
0892     spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
0893     /* Drop queue, since streamoff returns device to the same state as after
0894      * calling reqbufs. */
0895     INIT_LIST_HEAD(&q_ctx->rdy_queue);
0896     q_ctx->num_rdy = 0;
0897     spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
0898 
0899     if (m2m_dev->curr_ctx == m2m_ctx) {
0900         m2m_dev->curr_ctx = NULL;
0901         wake_up(&m2m_ctx->finished);
0902     }
0903     spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
0904 
0905     return 0;
0906 }
0907 EXPORT_SYMBOL_GPL(v4l2_m2m_streamoff);
0908 
0909 static __poll_t v4l2_m2m_poll_for_data(struct file *file,
0910                        struct v4l2_m2m_ctx *m2m_ctx,
0911                        struct poll_table_struct *wait)
0912 {
0913     struct vb2_queue *src_q, *dst_q;
0914     __poll_t rc = 0;
0915     unsigned long flags;
0916 
0917     src_q = v4l2_m2m_get_src_vq(m2m_ctx);
0918     dst_q = v4l2_m2m_get_dst_vq(m2m_ctx);
0919 
0920     /*
0921      * There has to be at least one buffer queued on each queued_list, which
0922      * means either in driver already or waiting for driver to claim it
0923      * and start processing.
0924      */
0925     if ((!src_q->streaming || src_q->error ||
0926          list_empty(&src_q->queued_list)) &&
0927         (!dst_q->streaming || dst_q->error ||
0928          (list_empty(&dst_q->queued_list) && !dst_q->last_buffer_dequeued)))
0929         return EPOLLERR;
0930 
0931     spin_lock_irqsave(&src_q->done_lock, flags);
0932     if (!list_empty(&src_q->done_list))
0933         rc |= EPOLLOUT | EPOLLWRNORM;
0934     spin_unlock_irqrestore(&src_q->done_lock, flags);
0935 
0936     spin_lock_irqsave(&dst_q->done_lock, flags);
0937     /*
0938      * If the last buffer was dequeued from the capture queue, signal
0939      * userspace. DQBUF(CAPTURE) will return -EPIPE.
0940      */
0941     if (!list_empty(&dst_q->done_list) || dst_q->last_buffer_dequeued)
0942         rc |= EPOLLIN | EPOLLRDNORM;
0943     spin_unlock_irqrestore(&dst_q->done_lock, flags);
0944 
0945     return rc;
0946 }
0947 
0948 __poll_t v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
0949                struct poll_table_struct *wait)
0950 {
0951     struct video_device *vfd = video_devdata(file);
0952     struct vb2_queue *src_q = v4l2_m2m_get_src_vq(m2m_ctx);
0953     struct vb2_queue *dst_q = v4l2_m2m_get_dst_vq(m2m_ctx);
0954     __poll_t req_events = poll_requested_events(wait);
0955     __poll_t rc = 0;
0956 
0957     /*
0958      * poll_wait() MUST be called on the first invocation on all the
0959      * potential queues of interest, even if we are not interested in their
0960      * events during this first call. Failure to do so will result in
0961      * queue's events to be ignored because the poll_table won't be capable
0962      * of adding new wait queues thereafter.
0963      */
0964     poll_wait(file, &src_q->done_wq, wait);
0965     poll_wait(file, &dst_q->done_wq, wait);
0966 
0967     if (req_events & (EPOLLOUT | EPOLLWRNORM | EPOLLIN | EPOLLRDNORM))
0968         rc = v4l2_m2m_poll_for_data(file, m2m_ctx, wait);
0969 
0970     if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) {
0971         struct v4l2_fh *fh = file->private_data;
0972 
0973         poll_wait(file, &fh->wait, wait);
0974         if (v4l2_event_pending(fh))
0975             rc |= EPOLLPRI;
0976     }
0977 
0978     return rc;
0979 }
0980 EXPORT_SYMBOL_GPL(v4l2_m2m_poll);
0981 
0982 int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
0983              struct vm_area_struct *vma)
0984 {
0985     unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
0986     struct vb2_queue *vq;
0987 
0988     if (offset < DST_QUEUE_OFF_BASE) {
0989         vq = v4l2_m2m_get_src_vq(m2m_ctx);
0990     } else {
0991         vq = v4l2_m2m_get_dst_vq(m2m_ctx);
0992         vma->vm_pgoff -= (DST_QUEUE_OFF_BASE >> PAGE_SHIFT);
0993     }
0994 
0995     return vb2_mmap(vq, vma);
0996 }
0997 EXPORT_SYMBOL(v4l2_m2m_mmap);
0998 
0999 #ifndef CONFIG_MMU
1000 unsigned long v4l2_m2m_get_unmapped_area(struct file *file, unsigned long addr,
1001                      unsigned long len, unsigned long pgoff,
1002                      unsigned long flags)
1003 {
1004     struct v4l2_fh *fh = file->private_data;
1005     unsigned long offset = pgoff << PAGE_SHIFT;
1006     struct vb2_queue *vq;
1007 
1008     if (offset < DST_QUEUE_OFF_BASE) {
1009         vq = v4l2_m2m_get_src_vq(fh->m2m_ctx);
1010     } else {
1011         vq = v4l2_m2m_get_dst_vq(fh->m2m_ctx);
1012         pgoff -= (DST_QUEUE_OFF_BASE >> PAGE_SHIFT);
1013     }
1014 
1015     return vb2_get_unmapped_area(vq, addr, len, pgoff, flags);
1016 }
1017 EXPORT_SYMBOL_GPL(v4l2_m2m_get_unmapped_area);
1018 #endif
1019 
1020 #if defined(CONFIG_MEDIA_CONTROLLER)
1021 void v4l2_m2m_unregister_media_controller(struct v4l2_m2m_dev *m2m_dev)
1022 {
1023     media_remove_intf_links(&m2m_dev->intf_devnode->intf);
1024     media_devnode_remove(m2m_dev->intf_devnode);
1025 
1026     media_entity_remove_links(m2m_dev->source);
1027     media_entity_remove_links(&m2m_dev->sink);
1028     media_entity_remove_links(&m2m_dev->proc);
1029     media_device_unregister_entity(m2m_dev->source);
1030     media_device_unregister_entity(&m2m_dev->sink);
1031     media_device_unregister_entity(&m2m_dev->proc);
1032     kfree(m2m_dev->source->name);
1033     kfree(m2m_dev->sink.name);
1034     kfree(m2m_dev->proc.name);
1035 }
1036 EXPORT_SYMBOL_GPL(v4l2_m2m_unregister_media_controller);
1037 
1038 static int v4l2_m2m_register_entity(struct media_device *mdev,
1039     struct v4l2_m2m_dev *m2m_dev, enum v4l2_m2m_entity_type type,
1040     struct video_device *vdev, int function)
1041 {
1042     struct media_entity *entity;
1043     struct media_pad *pads;
1044     char *name;
1045     unsigned int len;
1046     int num_pads;
1047     int ret;
1048 
1049     switch (type) {
1050     case MEM2MEM_ENT_TYPE_SOURCE:
1051         entity = m2m_dev->source;
1052         pads = &m2m_dev->source_pad;
1053         pads[0].flags = MEDIA_PAD_FL_SOURCE;
1054         num_pads = 1;
1055         break;
1056     case MEM2MEM_ENT_TYPE_SINK:
1057         entity = &m2m_dev->sink;
1058         pads = &m2m_dev->sink_pad;
1059         pads[0].flags = MEDIA_PAD_FL_SINK;
1060         num_pads = 1;
1061         break;
1062     case MEM2MEM_ENT_TYPE_PROC:
1063         entity = &m2m_dev->proc;
1064         pads = m2m_dev->proc_pads;
1065         pads[0].flags = MEDIA_PAD_FL_SINK;
1066         pads[1].flags = MEDIA_PAD_FL_SOURCE;
1067         num_pads = 2;
1068         break;
1069     default:
1070         return -EINVAL;
1071     }
1072 
1073     entity->obj_type = MEDIA_ENTITY_TYPE_BASE;
1074     if (type != MEM2MEM_ENT_TYPE_PROC) {
1075         entity->info.dev.major = VIDEO_MAJOR;
1076         entity->info.dev.minor = vdev->minor;
1077     }
1078     len = strlen(vdev->name) + 2 + strlen(m2m_entity_name[type]);
1079     name = kmalloc(len, GFP_KERNEL);
1080     if (!name)
1081         return -ENOMEM;
1082     snprintf(name, len, "%s-%s", vdev->name, m2m_entity_name[type]);
1083     entity->name = name;
1084     entity->function = function;
1085 
1086     ret = media_entity_pads_init(entity, num_pads, pads);
1087     if (ret)
1088         return ret;
1089     ret = media_device_register_entity(mdev, entity);
1090     if (ret)
1091         return ret;
1092 
1093     return 0;
1094 }
1095 
1096 int v4l2_m2m_register_media_controller(struct v4l2_m2m_dev *m2m_dev,
1097         struct video_device *vdev, int function)
1098 {
1099     struct media_device *mdev = vdev->v4l2_dev->mdev;
1100     struct media_link *link;
1101     int ret;
1102 
1103     if (!mdev)
1104         return 0;
1105 
1106     /* A memory-to-memory device consists in two
1107      * DMA engine and one video processing entities.
1108      * The DMA engine entities are linked to a V4L interface
1109      */
1110 
1111     /* Create the three entities with their pads */
1112     m2m_dev->source = &vdev->entity;
1113     ret = v4l2_m2m_register_entity(mdev, m2m_dev,
1114             MEM2MEM_ENT_TYPE_SOURCE, vdev, MEDIA_ENT_F_IO_V4L);
1115     if (ret)
1116         return ret;
1117     ret = v4l2_m2m_register_entity(mdev, m2m_dev,
1118             MEM2MEM_ENT_TYPE_PROC, vdev, function);
1119     if (ret)
1120         goto err_rel_entity0;
1121     ret = v4l2_m2m_register_entity(mdev, m2m_dev,
1122             MEM2MEM_ENT_TYPE_SINK, vdev, MEDIA_ENT_F_IO_V4L);
1123     if (ret)
1124         goto err_rel_entity1;
1125 
1126     /* Connect the three entities */
1127     ret = media_create_pad_link(m2m_dev->source, 0, &m2m_dev->proc, 0,
1128             MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
1129     if (ret)
1130         goto err_rel_entity2;
1131 
1132     ret = media_create_pad_link(&m2m_dev->proc, 1, &m2m_dev->sink, 0,
1133             MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
1134     if (ret)
1135         goto err_rm_links0;
1136 
1137     /* Create video interface */
1138     m2m_dev->intf_devnode = media_devnode_create(mdev,
1139             MEDIA_INTF_T_V4L_VIDEO, 0,
1140             VIDEO_MAJOR, vdev->minor);
1141     if (!m2m_dev->intf_devnode) {
1142         ret = -ENOMEM;
1143         goto err_rm_links1;
1144     }
1145 
1146     /* Connect the two DMA engines to the interface */
1147     link = media_create_intf_link(m2m_dev->source,
1148             &m2m_dev->intf_devnode->intf,
1149             MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
1150     if (!link) {
1151         ret = -ENOMEM;
1152         goto err_rm_devnode;
1153     }
1154 
1155     link = media_create_intf_link(&m2m_dev->sink,
1156             &m2m_dev->intf_devnode->intf,
1157             MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
1158     if (!link) {
1159         ret = -ENOMEM;
1160         goto err_rm_intf_link;
1161     }
1162     return 0;
1163 
1164 err_rm_intf_link:
1165     media_remove_intf_links(&m2m_dev->intf_devnode->intf);
1166 err_rm_devnode:
1167     media_devnode_remove(m2m_dev->intf_devnode);
1168 err_rm_links1:
1169     media_entity_remove_links(&m2m_dev->sink);
1170 err_rm_links0:
1171     media_entity_remove_links(&m2m_dev->proc);
1172     media_entity_remove_links(m2m_dev->source);
1173 err_rel_entity2:
1174     media_device_unregister_entity(&m2m_dev->proc);
1175     kfree(m2m_dev->proc.name);
1176 err_rel_entity1:
1177     media_device_unregister_entity(&m2m_dev->sink);
1178     kfree(m2m_dev->sink.name);
1179 err_rel_entity0:
1180     media_device_unregister_entity(m2m_dev->source);
1181     kfree(m2m_dev->source->name);
1182     return ret;
1183     return 0;
1184 }
1185 EXPORT_SYMBOL_GPL(v4l2_m2m_register_media_controller);
1186 #endif
1187 
1188 struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops)
1189 {
1190     struct v4l2_m2m_dev *m2m_dev;
1191 
1192     if (!m2m_ops || WARN_ON(!m2m_ops->device_run))
1193         return ERR_PTR(-EINVAL);
1194 
1195     m2m_dev = kzalloc(sizeof *m2m_dev, GFP_KERNEL);
1196     if (!m2m_dev)
1197         return ERR_PTR(-ENOMEM);
1198 
1199     m2m_dev->curr_ctx = NULL;
1200     m2m_dev->m2m_ops = m2m_ops;
1201     INIT_LIST_HEAD(&m2m_dev->job_queue);
1202     spin_lock_init(&m2m_dev->job_spinlock);
1203     INIT_WORK(&m2m_dev->job_work, v4l2_m2m_device_run_work);
1204 
1205     return m2m_dev;
1206 }
1207 EXPORT_SYMBOL_GPL(v4l2_m2m_init);
1208 
1209 void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev)
1210 {
1211     kfree(m2m_dev);
1212 }
1213 EXPORT_SYMBOL_GPL(v4l2_m2m_release);
1214 
1215 struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev,
1216         void *drv_priv,
1217         int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq))
1218 {
1219     struct v4l2_m2m_ctx *m2m_ctx;
1220     struct v4l2_m2m_queue_ctx *out_q_ctx, *cap_q_ctx;
1221     int ret;
1222 
1223     m2m_ctx = kzalloc(sizeof *m2m_ctx, GFP_KERNEL);
1224     if (!m2m_ctx)
1225         return ERR_PTR(-ENOMEM);
1226 
1227     m2m_ctx->priv = drv_priv;
1228     m2m_ctx->m2m_dev = m2m_dev;
1229     init_waitqueue_head(&m2m_ctx->finished);
1230 
1231     out_q_ctx = &m2m_ctx->out_q_ctx;
1232     cap_q_ctx = &m2m_ctx->cap_q_ctx;
1233 
1234     INIT_LIST_HEAD(&out_q_ctx->rdy_queue);
1235     INIT_LIST_HEAD(&cap_q_ctx->rdy_queue);
1236     spin_lock_init(&out_q_ctx->rdy_spinlock);
1237     spin_lock_init(&cap_q_ctx->rdy_spinlock);
1238 
1239     INIT_LIST_HEAD(&m2m_ctx->queue);
1240 
1241     ret = queue_init(drv_priv, &out_q_ctx->q, &cap_q_ctx->q);
1242 
1243     if (ret)
1244         goto err;
1245     /*
1246      * Both queues should use same the mutex to lock the m2m context.
1247      * This lock is used in some v4l2_m2m_* helpers.
1248      */
1249     if (WARN_ON(out_q_ctx->q.lock != cap_q_ctx->q.lock)) {
1250         ret = -EINVAL;
1251         goto err;
1252     }
1253     m2m_ctx->q_lock = out_q_ctx->q.lock;
1254 
1255     return m2m_ctx;
1256 err:
1257     kfree(m2m_ctx);
1258     return ERR_PTR(ret);
1259 }
1260 EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_init);
1261 
1262 void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx)
1263 {
1264     /* wait until the current context is dequeued from job_queue */
1265     v4l2_m2m_cancel_job(m2m_ctx);
1266 
1267     vb2_queue_release(&m2m_ctx->cap_q_ctx.q);
1268     vb2_queue_release(&m2m_ctx->out_q_ctx.q);
1269 
1270     kfree(m2m_ctx);
1271 }
1272 EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_release);
1273 
1274 void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx,
1275         struct vb2_v4l2_buffer *vbuf)
1276 {
1277     struct v4l2_m2m_buffer *b = container_of(vbuf,
1278                 struct v4l2_m2m_buffer, vb);
1279     struct v4l2_m2m_queue_ctx *q_ctx;
1280     unsigned long flags;
1281 
1282     q_ctx = get_queue_ctx(m2m_ctx, vbuf->vb2_buf.vb2_queue->type);
1283     if (!q_ctx)
1284         return;
1285 
1286     spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
1287     list_add_tail(&b->list, &q_ctx->rdy_queue);
1288     q_ctx->num_rdy++;
1289     spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
1290 }
1291 EXPORT_SYMBOL_GPL(v4l2_m2m_buf_queue);
1292 
1293 void v4l2_m2m_buf_copy_metadata(const struct vb2_v4l2_buffer *out_vb,
1294                 struct vb2_v4l2_buffer *cap_vb,
1295                 bool copy_frame_flags)
1296 {
1297     u32 mask = V4L2_BUF_FLAG_TIMECODE | V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
1298 
1299     if (copy_frame_flags)
1300         mask |= V4L2_BUF_FLAG_KEYFRAME | V4L2_BUF_FLAG_PFRAME |
1301             V4L2_BUF_FLAG_BFRAME;
1302 
1303     cap_vb->vb2_buf.timestamp = out_vb->vb2_buf.timestamp;
1304 
1305     if (out_vb->flags & V4L2_BUF_FLAG_TIMECODE)
1306         cap_vb->timecode = out_vb->timecode;
1307     cap_vb->field = out_vb->field;
1308     cap_vb->flags &= ~mask;
1309     cap_vb->flags |= out_vb->flags & mask;
1310     cap_vb->vb2_buf.copied_timestamp = 1;
1311 }
1312 EXPORT_SYMBOL_GPL(v4l2_m2m_buf_copy_metadata);
1313 
1314 void v4l2_m2m_request_queue(struct media_request *req)
1315 {
1316     struct media_request_object *obj, *obj_safe;
1317     struct v4l2_m2m_ctx *m2m_ctx = NULL;
1318 
1319     /*
1320      * Queue all objects. Note that buffer objects are at the end of the
1321      * objects list, after all other object types. Once buffer objects
1322      * are queued, the driver might delete them immediately (if the driver
1323      * processes the buffer at once), so we have to use
1324      * list_for_each_entry_safe() to handle the case where the object we
1325      * queue is deleted.
1326      */
1327     list_for_each_entry_safe(obj, obj_safe, &req->objects, list) {
1328         struct v4l2_m2m_ctx *m2m_ctx_obj;
1329         struct vb2_buffer *vb;
1330 
1331         if (!obj->ops->queue)
1332             continue;
1333 
1334         if (vb2_request_object_is_buffer(obj)) {
1335             /* Sanity checks */
1336             vb = container_of(obj, struct vb2_buffer, req_obj);
1337             WARN_ON(!V4L2_TYPE_IS_OUTPUT(vb->vb2_queue->type));
1338             m2m_ctx_obj = container_of(vb->vb2_queue,
1339                            struct v4l2_m2m_ctx,
1340                            out_q_ctx.q);
1341             WARN_ON(m2m_ctx && m2m_ctx_obj != m2m_ctx);
1342             m2m_ctx = m2m_ctx_obj;
1343         }
1344 
1345         /*
1346          * The buffer we queue here can in theory be immediately
1347          * unbound, hence the use of list_for_each_entry_safe()
1348          * above and why we call the queue op last.
1349          */
1350         obj->ops->queue(obj);
1351     }
1352 
1353     WARN_ON(!m2m_ctx);
1354 
1355     if (m2m_ctx)
1356         v4l2_m2m_try_schedule(m2m_ctx);
1357 }
1358 EXPORT_SYMBOL_GPL(v4l2_m2m_request_queue);
1359 
1360 /* Videobuf2 ioctl helpers */
1361 
1362 int v4l2_m2m_ioctl_reqbufs(struct file *file, void *priv,
1363                 struct v4l2_requestbuffers *rb)
1364 {
1365     struct v4l2_fh *fh = file->private_data;
1366 
1367     return v4l2_m2m_reqbufs(file, fh->m2m_ctx, rb);
1368 }
1369 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_reqbufs);
1370 
1371 int v4l2_m2m_ioctl_create_bufs(struct file *file, void *priv,
1372                 struct v4l2_create_buffers *create)
1373 {
1374     struct v4l2_fh *fh = file->private_data;
1375 
1376     return v4l2_m2m_create_bufs(file, fh->m2m_ctx, create);
1377 }
1378 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_create_bufs);
1379 
1380 int v4l2_m2m_ioctl_querybuf(struct file *file, void *priv,
1381                 struct v4l2_buffer *buf)
1382 {
1383     struct v4l2_fh *fh = file->private_data;
1384 
1385     return v4l2_m2m_querybuf(file, fh->m2m_ctx, buf);
1386 }
1387 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_querybuf);
1388 
1389 int v4l2_m2m_ioctl_qbuf(struct file *file, void *priv,
1390                 struct v4l2_buffer *buf)
1391 {
1392     struct v4l2_fh *fh = file->private_data;
1393 
1394     return v4l2_m2m_qbuf(file, fh->m2m_ctx, buf);
1395 }
1396 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_qbuf);
1397 
1398 int v4l2_m2m_ioctl_dqbuf(struct file *file, void *priv,
1399                 struct v4l2_buffer *buf)
1400 {
1401     struct v4l2_fh *fh = file->private_data;
1402 
1403     return v4l2_m2m_dqbuf(file, fh->m2m_ctx, buf);
1404 }
1405 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_dqbuf);
1406 
1407 int v4l2_m2m_ioctl_prepare_buf(struct file *file, void *priv,
1408                    struct v4l2_buffer *buf)
1409 {
1410     struct v4l2_fh *fh = file->private_data;
1411 
1412     return v4l2_m2m_prepare_buf(file, fh->m2m_ctx, buf);
1413 }
1414 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_prepare_buf);
1415 
1416 int v4l2_m2m_ioctl_expbuf(struct file *file, void *priv,
1417                 struct v4l2_exportbuffer *eb)
1418 {
1419     struct v4l2_fh *fh = file->private_data;
1420 
1421     return v4l2_m2m_expbuf(file, fh->m2m_ctx, eb);
1422 }
1423 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_expbuf);
1424 
1425 int v4l2_m2m_ioctl_streamon(struct file *file, void *priv,
1426                 enum v4l2_buf_type type)
1427 {
1428     struct v4l2_fh *fh = file->private_data;
1429 
1430     return v4l2_m2m_streamon(file, fh->m2m_ctx, type);
1431 }
1432 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_streamon);
1433 
1434 int v4l2_m2m_ioctl_streamoff(struct file *file, void *priv,
1435                 enum v4l2_buf_type type)
1436 {
1437     struct v4l2_fh *fh = file->private_data;
1438 
1439     return v4l2_m2m_streamoff(file, fh->m2m_ctx, type);
1440 }
1441 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_streamoff);
1442 
1443 int v4l2_m2m_ioctl_try_encoder_cmd(struct file *file, void *fh,
1444                    struct v4l2_encoder_cmd *ec)
1445 {
1446     if (ec->cmd != V4L2_ENC_CMD_STOP && ec->cmd != V4L2_ENC_CMD_START)
1447         return -EINVAL;
1448 
1449     ec->flags = 0;
1450     return 0;
1451 }
1452 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_try_encoder_cmd);
1453 
1454 int v4l2_m2m_ioctl_try_decoder_cmd(struct file *file, void *fh,
1455                    struct v4l2_decoder_cmd *dc)
1456 {
1457     if (dc->cmd != V4L2_DEC_CMD_STOP && dc->cmd != V4L2_DEC_CMD_START)
1458         return -EINVAL;
1459 
1460     dc->flags = 0;
1461 
1462     if (dc->cmd == V4L2_DEC_CMD_STOP) {
1463         dc->stop.pts = 0;
1464     } else if (dc->cmd == V4L2_DEC_CMD_START) {
1465         dc->start.speed = 0;
1466         dc->start.format = V4L2_DEC_START_FMT_NONE;
1467     }
1468     return 0;
1469 }
1470 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_try_decoder_cmd);
1471 
1472 /*
1473  * Updates the encoding state on ENC_CMD_STOP/ENC_CMD_START
1474  * Should be called from the encoder driver encoder_cmd() callback
1475  */
1476 int v4l2_m2m_encoder_cmd(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
1477              struct v4l2_encoder_cmd *ec)
1478 {
1479     if (ec->cmd != V4L2_ENC_CMD_STOP && ec->cmd != V4L2_ENC_CMD_START)
1480         return -EINVAL;
1481 
1482     if (ec->cmd == V4L2_ENC_CMD_STOP)
1483         return v4l2_update_last_buf_state(m2m_ctx);
1484 
1485     if (m2m_ctx->is_draining)
1486         return -EBUSY;
1487 
1488     if (m2m_ctx->has_stopped)
1489         m2m_ctx->has_stopped = false;
1490 
1491     return 0;
1492 }
1493 EXPORT_SYMBOL_GPL(v4l2_m2m_encoder_cmd);
1494 
1495 /*
1496  * Updates the decoding state on DEC_CMD_STOP/DEC_CMD_START
1497  * Should be called from the decoder driver decoder_cmd() callback
1498  */
1499 int v4l2_m2m_decoder_cmd(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
1500              struct v4l2_decoder_cmd *dc)
1501 {
1502     if (dc->cmd != V4L2_DEC_CMD_STOP && dc->cmd != V4L2_DEC_CMD_START)
1503         return -EINVAL;
1504 
1505     if (dc->cmd == V4L2_DEC_CMD_STOP)
1506         return v4l2_update_last_buf_state(m2m_ctx);
1507 
1508     if (m2m_ctx->is_draining)
1509         return -EBUSY;
1510 
1511     if (m2m_ctx->has_stopped)
1512         m2m_ctx->has_stopped = false;
1513 
1514     return 0;
1515 }
1516 EXPORT_SYMBOL_GPL(v4l2_m2m_decoder_cmd);
1517 
1518 int v4l2_m2m_ioctl_encoder_cmd(struct file *file, void *priv,
1519                    struct v4l2_encoder_cmd *ec)
1520 {
1521     struct v4l2_fh *fh = file->private_data;
1522 
1523     return v4l2_m2m_encoder_cmd(file, fh->m2m_ctx, ec);
1524 }
1525 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_encoder_cmd);
1526 
1527 int v4l2_m2m_ioctl_decoder_cmd(struct file *file, void *priv,
1528                    struct v4l2_decoder_cmd *dc)
1529 {
1530     struct v4l2_fh *fh = file->private_data;
1531 
1532     return v4l2_m2m_decoder_cmd(file, fh->m2m_ctx, dc);
1533 }
1534 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_decoder_cmd);
1535 
1536 int v4l2_m2m_ioctl_stateless_try_decoder_cmd(struct file *file, void *fh,
1537                          struct v4l2_decoder_cmd *dc)
1538 {
1539     if (dc->cmd != V4L2_DEC_CMD_FLUSH)
1540         return -EINVAL;
1541 
1542     dc->flags = 0;
1543 
1544     return 0;
1545 }
1546 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_stateless_try_decoder_cmd);
1547 
1548 int v4l2_m2m_ioctl_stateless_decoder_cmd(struct file *file, void *priv,
1549                      struct v4l2_decoder_cmd *dc)
1550 {
1551     struct v4l2_fh *fh = file->private_data;
1552     struct vb2_v4l2_buffer *out_vb, *cap_vb;
1553     struct v4l2_m2m_dev *m2m_dev = fh->m2m_ctx->m2m_dev;
1554     unsigned long flags;
1555     int ret;
1556 
1557     ret = v4l2_m2m_ioctl_stateless_try_decoder_cmd(file, priv, dc);
1558     if (ret < 0)
1559         return ret;
1560 
1561     spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
1562     out_vb = v4l2_m2m_last_src_buf(fh->m2m_ctx);
1563     cap_vb = v4l2_m2m_last_dst_buf(fh->m2m_ctx);
1564 
1565     /*
1566      * If there is an out buffer pending, then clear any HOLD flag.
1567      *
1568      * By clearing this flag we ensure that when this output
1569      * buffer is processed any held capture buffer will be released.
1570      */
1571     if (out_vb) {
1572         out_vb->flags &= ~V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF;
1573     } else if (cap_vb && cap_vb->is_held) {
1574         /*
1575          * If there were no output buffers, but there is a
1576          * capture buffer that is held, then release that
1577          * buffer.
1578          */
1579         cap_vb->is_held = false;
1580         v4l2_m2m_dst_buf_remove(fh->m2m_ctx);
1581         v4l2_m2m_buf_done(cap_vb, VB2_BUF_STATE_DONE);
1582     }
1583     spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
1584 
1585     return 0;
1586 }
1587 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_stateless_decoder_cmd);
1588 
1589 /*
1590  * v4l2_file_operations helpers. It is assumed here same lock is used
1591  * for the output and the capture buffer queue.
1592  */
1593 
1594 int v4l2_m2m_fop_mmap(struct file *file, struct vm_area_struct *vma)
1595 {
1596     struct v4l2_fh *fh = file->private_data;
1597 
1598     return v4l2_m2m_mmap(file, fh->m2m_ctx, vma);
1599 }
1600 EXPORT_SYMBOL_GPL(v4l2_m2m_fop_mmap);
1601 
1602 __poll_t v4l2_m2m_fop_poll(struct file *file, poll_table *wait)
1603 {
1604     struct v4l2_fh *fh = file->private_data;
1605     struct v4l2_m2m_ctx *m2m_ctx = fh->m2m_ctx;
1606     __poll_t ret;
1607 
1608     if (m2m_ctx->q_lock)
1609         mutex_lock(m2m_ctx->q_lock);
1610 
1611     ret = v4l2_m2m_poll(file, m2m_ctx, wait);
1612 
1613     if (m2m_ctx->q_lock)
1614         mutex_unlock(m2m_ctx->q_lock);
1615 
1616     return ret;
1617 }
1618 EXPORT_SYMBOL_GPL(v4l2_m2m_fop_poll);
1619
[ Source navigation ] [ Diff markup ] [ Identifier search ] [ general search ]

This page was automatically generated by the 2.1.0 LXR engine.

The LXR team
Valid CSS 2.1! Valid HTML 4.01!