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[PATCH v8 1/3] drm/fence: add in-fences support

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  [PATCH v8 1/3] drm/fence: add in-fences support Gustavo Padovan <gustavo@padovan.org> - 2016-11-11 06:20 +0100
    Re: [PATCH v8 1/3] drm/fence: add in-fences support Brian Starkey <brian.starkey@arm.com> - 2016-11-11 11:50 +0100

#1519574 — [PATCH v8 1/3] drm/fence: add in-fences support

From: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

There is now a new property called IN_FENCE_FD attached to every plane
state that receives sync_file fds from userspace via the atomic commit
IOCTL.

The fd is then translated to a fence (that may be a fence_array
subclass or just a normal fence) and then used by DRM to fence_wait() for
all fences in the sync_file to signal. So it only commits when all
framebuffers are ready to scanout.

v2: Comments by Daniel Vetter:
	- remove set state->fence = NULL in destroy phase
	- accept fence -1 as valid and just return 0
	- do not call fence_get() - sync_file_fences_get() already calls it
	- fence_put() if state->fence is already set, in case userspace
	set the property more than once.

v3: WARN_ON if fence is set but state has no FB

v4: Comment from Maarten Lankhorst
	- allow set fence with no related fb

v5: rename FENCE_FD to IN_FENCE_FD

v6: Comments by Daniel Vetter:
	- rename plane_state->in_fence back to "fence"
	- re-introduce WARN_ON if fence set but no fb

     - rebase after fence -> dma_fence rename

v7: Comments by Brian Starkey
	- set state->fence to NULL when duplicating the state
	- fail if IN_FENCE_FD was already set

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
---
 drivers/gpu/drm/Kconfig             |  1 +
 drivers/gpu/drm/drm_atomic.c        | 14 ++++++++++++++
 drivers/gpu/drm/drm_atomic_helper.c |  5 +++++
 drivers/gpu/drm/drm_crtc.c          |  6 ++++++
 drivers/gpu/drm/drm_plane.c         |  1 +
 include/drm/drm_crtc.h              |  5 +++++
 6 files changed, 32 insertions(+)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 25e8e37..360cb92 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -12,6 +12,7 @@ menuconfig DRM
 	select I2C
 	select I2C_ALGOBIT
 	select DMA_SHARED_BUFFER
+	select SYNC_FILE
 	help
 	  Kernel-level support for the Direct Rendering Infrastructure (DRI)
 	  introduced in XFree86 4.0. If you say Y here, you need to select
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index b096c16..8e26ad1 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -31,6 +31,7 @@
 #include <drm/drm_mode.h>
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_print.h>
+#include <linux/sync_file.h>
 
 #include "drm_crtc_internal.h"
 
@@ -709,6 +710,17 @@ int drm_atomic_plane_set_property(struct drm_plane *plane,
 		drm_atomic_set_fb_for_plane(state, fb);
 		if (fb)
 			drm_framebuffer_unreference(fb);
+	} else if (property == config->prop_in_fence_fd) {
+		if (state->fence)
+			return -EINVAL;
+
+		if (U642I64(val) == -1)
+			return 0;
+
+		state->fence = sync_file_get_fence(val);
+		if (!state->fence)
+			return -EINVAL;
+
 	} else if (property == config->prop_crtc_id) {
 		struct drm_crtc *crtc = drm_crtc_find(dev, val);
 		return drm_atomic_set_crtc_for_plane(state, crtc);
@@ -770,6 +782,8 @@ drm_atomic_plane_get_property(struct drm_plane *plane,
 
 	if (property == config->prop_fb_id) {
 		*val = (state->fb) ? state->fb->base.id : 0;
+	} else if (property == config->prop_in_fence_fd) {
+		*val = -1;
 	} else if (property == config->prop_crtc_id) {
 		*val = (state->crtc) ? state->crtc->base.id : 0;
 	} else if (property == config->prop_crtc_x) {
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 75ad01d..caed870 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -3076,6 +3076,8 @@ void __drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane,
 
 	if (state->fb)
 		drm_framebuffer_reference(state->fb);
+
+	state->fence = NULL;
 }
 EXPORT_SYMBOL(__drm_atomic_helper_plane_duplicate_state);
 
@@ -3114,6 +3116,9 @@ void __drm_atomic_helper_plane_destroy_state(struct drm_plane_state *state)
 {
 	if (state->fb)
 		drm_framebuffer_unreference(state->fb);
+
+	if (state->fence)
+		dma_fence_put(state->fence);
 }
 EXPORT_SYMBOL(__drm_atomic_helper_plane_destroy_state);
 
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index ce274ed..154e040 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -397,6 +397,12 @@ static int drm_mode_create_standard_properties(struct drm_device *dev)
 		return -ENOMEM;
 	dev->mode_config.prop_fb_id = prop;
 
+	prop = drm_property_create_signed_range(dev, DRM_MODE_PROP_ATOMIC,
+			"IN_FENCE_FD", -1, INT_MAX);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.prop_in_fence_fd = prop;
+
 	prop = drm_property_create_object(dev, DRM_MODE_PROP_ATOMIC,
 			"CRTC_ID", DRM_MODE_OBJECT_CRTC);
 	if (!prop)
diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index 249c0ae..3957ef8 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -137,6 +137,7 @@ int drm_universal_plane_init(struct drm_device *dev, struct drm_plane *plane,
 
 	if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
 		drm_object_attach_property(&plane->base, config->prop_fb_id, 0);
+		drm_object_attach_property(&plane->base, config->prop_in_fence_fd, -1);
 		drm_object_attach_property(&plane->base, config->prop_crtc_id, 0);
 		drm_object_attach_property(&plane->base, config->prop_crtc_x, 0);
 		drm_object_attach_property(&plane->base, config->prop_crtc_y, 0);
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 8cca2a8..11780a9 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -1214,6 +1214,11 @@ struct drm_mode_config {
 	 */
 	struct drm_property *prop_fb_id;
 	/**
+	 * @prop_in_fence_fd: Sync File fd representing the incoming fences
+	 * for a Plane.
+	 */
+	struct drm_property *prop_in_fence_fd;
+	/**
 	 * @prop_crtc_id: Default atomic plane property to specify the
 	 * &drm_crtc.
 	 */
-- 
2.5.5

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#1519684

Hi Gustavo,

On Fri, Nov 11, 2016 at 02:16:07PM +0900, Gustavo Padovan wrote:
>From: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
>
>There is now a new property called IN_FENCE_FD attached to every plane
>state that receives sync_file fds from userspace via the atomic commit
>IOCTL.
>
>The fd is then translated to a fence (that may be a fence_array
>subclass or just a normal fence) and then used by DRM to fence_wait() for
>all fences in the sync_file to signal. So it only commits when all
>framebuffers are ready to scanout.
>
>v2: Comments by Daniel Vetter:
>	- remove set state->fence = NULL in destroy phase
>	- accept fence -1 as valid and just return 0
>	- do not call fence_get() - sync_file_fences_get() already calls it
>	- fence_put() if state->fence is already set, in case userspace
>	set the property more than once.
>
>v3: WARN_ON if fence is set but state has no FB
>
>v4: Comment from Maarten Lankhorst
>	- allow set fence with no related fb
>
>v5: rename FENCE_FD to IN_FENCE_FD
>
>v6: Comments by Daniel Vetter:
>	- rename plane_state->in_fence back to "fence"
>	- re-introduce WARN_ON if fence set but no fb
>
>     - rebase after fence -> dma_fence rename
>
>v7: Comments by Brian Starkey
>	- set state->fence to NULL when duplicating the state
>	- fail if IN_FENCE_FD was already set
>
>Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

lgtm,

Reviewed-by: Brian Starkey <brian.starkey@arm.com>

>---
> drivers/gpu/drm/Kconfig             |  1 +
> drivers/gpu/drm/drm_atomic.c        | 14 ++++++++++++++
> drivers/gpu/drm/drm_atomic_helper.c |  5 +++++
> drivers/gpu/drm/drm_crtc.c          |  6 ++++++
> drivers/gpu/drm/drm_plane.c         |  1 +
> include/drm/drm_crtc.h              |  5 +++++
> 6 files changed, 32 insertions(+)
>
>diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
>index 25e8e37..360cb92 100644
>--- a/drivers/gpu/drm/Kconfig
>+++ b/drivers/gpu/drm/Kconfig
>@@ -12,6 +12,7 @@ menuconfig DRM
> 	select I2C
> 	select I2C_ALGOBIT
> 	select DMA_SHARED_BUFFER
>+	select SYNC_FILE
> 	help
> 	  Kernel-level support for the Direct Rendering Infrastructure (DRI)
> 	  introduced in XFree86 4.0. If you say Y here, you need to select
>diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
>index b096c16..8e26ad1 100644
>--- a/drivers/gpu/drm/drm_atomic.c
>+++ b/drivers/gpu/drm/drm_atomic.c
>@@ -31,6 +31,7 @@
> #include <drm/drm_mode.h>
> #include <drm/drm_plane_helper.h>
> #include <drm/drm_print.h>
>+#include <linux/sync_file.h>
>
> #include "drm_crtc_internal.h"
>
>@@ -709,6 +710,17 @@ int drm_atomic_plane_set_property(struct drm_plane *plane,
> 		drm_atomic_set_fb_for_plane(state, fb);
> 		if (fb)
> 			drm_framebuffer_unreference(fb);
>+	} else if (property == config->prop_in_fence_fd) {
>+		if (state->fence)
>+			return -EINVAL;
>+
>+		if (U642I64(val) == -1)
>+			return 0;
>+
>+		state->fence = sync_file_get_fence(val);
>+		if (!state->fence)
>+			return -EINVAL;
>+
> 	} else if (property == config->prop_crtc_id) {
> 		struct drm_crtc *crtc = drm_crtc_find(dev, val);
> 		return drm_atomic_set_crtc_for_plane(state, crtc);
>@@ -770,6 +782,8 @@ drm_atomic_plane_get_property(struct drm_plane *plane,
>
> 	if (property == config->prop_fb_id) {
> 		*val = (state->fb) ? state->fb->base.id : 0;
>+	} else if (property == config->prop_in_fence_fd) {
>+		*val = -1;
> 	} else if (property == config->prop_crtc_id) {
> 		*val = (state->crtc) ? state->crtc->base.id : 0;
> 	} else if (property == config->prop_crtc_x) {
>diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
>index 75ad01d..caed870 100644
>--- a/drivers/gpu/drm/drm_atomic_helper.c
>+++ b/drivers/gpu/drm/drm_atomic_helper.c
>@@ -3076,6 +3076,8 @@ void __drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane,
>
> 	if (state->fb)
> 		drm_framebuffer_reference(state->fb);
>+
>+	state->fence = NULL;
> }
> EXPORT_SYMBOL(__drm_atomic_helper_plane_duplicate_state);
>
>@@ -3114,6 +3116,9 @@ void __drm_atomic_helper_plane_destroy_state(struct drm_plane_state *state)
> {
> 	if (state->fb)
> 		drm_framebuffer_unreference(state->fb);
>+
>+	if (state->fence)
>+		dma_fence_put(state->fence);
> }
> EXPORT_SYMBOL(__drm_atomic_helper_plane_destroy_state);
>
>diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
>index ce274ed..154e040 100644
>--- a/drivers/gpu/drm/drm_crtc.c
>+++ b/drivers/gpu/drm/drm_crtc.c
>@@ -397,6 +397,12 @@ static int drm_mode_create_standard_properties(struct drm_device *dev)
> 		return -ENOMEM;
> 	dev->mode_config.prop_fb_id = prop;
>
>+	prop = drm_property_create_signed_range(dev, DRM_MODE_PROP_ATOMIC,
>+			"IN_FENCE_FD", -1, INT_MAX);
>+	if (!prop)
>+		return -ENOMEM;
>+	dev->mode_config.prop_in_fence_fd = prop;
>+
> 	prop = drm_property_create_object(dev, DRM_MODE_PROP_ATOMIC,
> 			"CRTC_ID", DRM_MODE_OBJECT_CRTC);
> 	if (!prop)
>diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
>index 249c0ae..3957ef8 100644
>--- a/drivers/gpu/drm/drm_plane.c
>+++ b/drivers/gpu/drm/drm_plane.c
>@@ -137,6 +137,7 @@ int drm_universal_plane_init(struct drm_device *dev, struct drm_plane *plane,
>
> 	if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
> 		drm_object_attach_property(&plane->base, config->prop_fb_id, 0);
>+		drm_object_attach_property(&plane->base, config->prop_in_fence_fd, -1);
> 		drm_object_attach_property(&plane->base, config->prop_crtc_id, 0);
> 		drm_object_attach_property(&plane->base, config->prop_crtc_x, 0);
> 		drm_object_attach_property(&plane->base, config->prop_crtc_y, 0);
>diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
>index 8cca2a8..11780a9 100644
>--- a/include/drm/drm_crtc.h
>+++ b/include/drm/drm_crtc.h
>@@ -1214,6 +1214,11 @@ struct drm_mode_config {
> 	 */
> 	struct drm_property *prop_fb_id;
> 	/**
>+	 * @prop_in_fence_fd: Sync File fd representing the incoming fences
>+	 * for a Plane.
>+	 */
>+	struct drm_property *prop_in_fence_fd;
>+	/**
> 	 * @prop_crtc_id: Default atomic plane property to specify the
> 	 * &drm_crtc.
> 	 */
>-- 
>2.5.5
>

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