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95 lines
2.7 KiB
Diff
95 lines
2.7 KiB
Diff
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From bac03c02a20186f93180c824ea58647e81455976 Mon Sep 17 00:00:00 2001
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From: Ezequiel Garcia <ezequiel@collabora.com>
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Date: Sun, 21 Mar 2021 16:38:54 -0300
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Subject: [PATCH] RFC: media: Add media_request_{pin,unpin} API
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This is probably not the API we will want to add, but it
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should show what semantics are needed by drivers.
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The goal is to allow the OUTPUT (aka source) buffer and the
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controls associated to a request to be released from the request,
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and in particular return the OUTPUT buffer back to userspace,
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without signalling the media request fd.
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This is useful for devices that are able to pre-process
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the OUTPUT buffer, therefore able to release it before
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the decoding is finished. These drivers should signal
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the media request fd only after the CAPTURE buffer is done.
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Tested-by: John Cox <jc@kynesim.co.uk>
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Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
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---
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drivers/media/mc/mc-request.c | 35 +++++++++++++++++++++++++++++++++++
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include/media/media-request.h | 12 ++++++++++++
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2 files changed, 47 insertions(+)
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--- a/drivers/media/mc/mc-request.c
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+++ b/drivers/media/mc/mc-request.c
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@@ -505,3 +505,38 @@ unlock:
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media_request_put(req);
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}
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EXPORT_SYMBOL_GPL(media_request_object_complete);
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+
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+void media_request_pin(struct media_request *req)
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+{
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+ unsigned long flags;
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+
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+ spin_lock_irqsave(&req->lock, flags);
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+ if (WARN_ON(req->state != MEDIA_REQUEST_STATE_QUEUED))
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+ goto unlock;
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+ req->num_incomplete_objects++;
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+unlock:
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+ spin_unlock_irqrestore(&req->lock, flags);
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+}
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+EXPORT_SYMBOL_GPL(media_request_pin);
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+
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+void media_request_unpin(struct media_request *req)
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+{
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+ unsigned long flags;
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+ bool completed = false;
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+
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+ spin_lock_irqsave(&req->lock, flags);
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+ if (WARN_ON(!req->num_incomplete_objects) ||
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+ WARN_ON(req->state != MEDIA_REQUEST_STATE_QUEUED))
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+ goto unlock;
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+
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+ if (!--req->num_incomplete_objects) {
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+ req->state = MEDIA_REQUEST_STATE_COMPLETE;
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+ wake_up_interruptible_all(&req->poll_wait);
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+ completed = true;
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+ }
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+unlock:
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+ spin_unlock_irqrestore(&req->lock, flags);
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+ if (completed)
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+ media_request_put(req);
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+}
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+EXPORT_SYMBOL_GPL(media_request_unpin);
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--- a/include/media/media-request.h
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+++ b/include/media/media-request.h
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@@ -189,6 +189,10 @@ static inline void media_request_get(str
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*/
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void media_request_put(struct media_request *req);
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+void media_request_pin(struct media_request *req);
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+
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+void media_request_unpin(struct media_request *req);
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+
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/**
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* media_request_get_by_fd - Get a media request by fd
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*
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@@ -228,6 +232,14 @@ static inline void media_request_put(str
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{
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}
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+static inline void media_request_pin(struct media_request *req)
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+{
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+}
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+
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+static inline void media_request_unpin(struct media_request *req)
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+{
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+}
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+
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static inline struct media_request *
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media_request_get_by_fd(struct media_device *mdev, int request_fd)
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{
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