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From: Daniel Vetter <daniel.vetter@ffwll.ch>
To: DRI Development <dri-devel@lists.freedesktop.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>,
	Liviu Dudau <liviu.dudau@arm.com>,
	Mihail Atanassov <mihail.atanassov@arm.com>,
	James Qian Wang <james.qian.wang@arm.com>,
	Daniel Vetter <daniel.vetter@intel.com>
Subject: [PATCH 04/11] drm/komeda: Annotate dma-fence critical section in commit path
Date: Thu, 21 Jan 2021 16:29:52 +0100
Message-ID: <20210121152959.1725404-5-daniel.vetter@ffwll.ch> (raw)
In-Reply-To: <20210121152959.1725404-1-daniel.vetter@ffwll.ch>

Like the helpers, nothing special. Well except not, because we the
critical section extends until after hw_done(), since that's the last
thing which could hold up a subsequent atomic commit. That means the
wait_for_flip_done is included, but that's not a problem, we're
allowed to call dma_fence_wait() from signalling critical sections.
Even on our own fence (which this does), it's just a bit confusing.
But in a way those last 2 function calls are already part of the fence
signalling critical section for the next atomic commit.

Reading this I'm wondering why komeda waits for flip_done() before
calling hw_done(), which is a bit backwards (but hey hw can be
special). Might be good to throw a comment in there that explains why,
because the original commit that added this just doesn't.

v2: Small rebase

Reviewed-by: James Qian Wang <james.qian.wang@arm.com> (v1)
Cc: "James (Qian) Wang" <james.qian.wang@arm.com>
Cc: Liviu Dudau <liviu.dudau@arm.com>
Cc: Mihail Atanassov <mihail.atanassov@arm.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 drivers/gpu/drm/arm/display/komeda/komeda_kms.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
index 034ee08482e0..aeda4e5ec4f4 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
@@ -73,6 +73,7 @@ static const struct drm_driver komeda_kms_driver = {
 static void komeda_kms_commit_tail(struct drm_atomic_state *old_state)
 {
 	struct drm_device *dev = old_state->dev;
+	bool fence_cookie = dma_fence_begin_signalling();
 
 	drm_atomic_helper_commit_modeset_disables(dev, old_state);
 
@@ -85,6 +86,8 @@ static void komeda_kms_commit_tail(struct drm_atomic_state *old_state)
 
 	drm_atomic_helper_wait_for_flip_done(dev, old_state);
 
+	dma_fence_end_signalling(fence_cookie);
+
 	drm_atomic_helper_cleanup_planes(dev, old_state);
 }
 
-- 
2.30.0

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  parent reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-21 15:29 [PATCH 00/11] dma_fence critical sections annotations for atomic Daniel Vetter
2021-01-21 15:29 ` [PATCH 01/11] drm/atomic-helper: Add dma-fence annotations Daniel Vetter
2021-01-21 15:29 ` [PATCH 02/11] drm/vkms: Annotate vblank timer Daniel Vetter
2021-01-21 15:29 ` [PATCH 03/11] drm/vblank: Annotate with dma-fence signalling section Daniel Vetter
2021-01-21 15:29 ` Daniel Vetter [this message]
2021-01-21 15:29 ` [PATCH 05/11] drm/malidp: Annotate dma-fence critical section in commit path Daniel Vetter
2021-01-21 15:29 ` [PATCH 06/11] drm/atmel: Use drm_atomic_helper_commit Daniel Vetter
2021-01-21 15:29 ` [PATCH 07/11] drm/imx: Annotate dma-fence critical section in commit path Daniel Vetter
2021-01-21 15:29 ` [PATCH 08/11] drm/omapdrm: " Daniel Vetter
2021-01-21 15:29 ` [PATCH 09/11] drm/rcar-du: " Daniel Vetter
2021-01-21 15:29 ` [PATCH 10/11] drm/tegra: " Daniel Vetter
2021-02-05 18:09   ` Thierry Reding
2021-01-21 15:29 ` [PATCH 11/11] drm/tidss: " Daniel Vetter
2021-02-23 11:54 ` [PATCH 00/11] dma_fence critical sections annotations for atomic Daniel Vetter

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