[PATCH 00/24] drm_framebuffer boilerplate removal

[PATCH 00/24] drm_framebuffer boilerplate removal

[Daniel Stone]

Hi,
I've been working on a getfb2[0] ioctl, which amongst other things
supports multi-planar framebuffers as well as modifiers. getfb
currently calls the framebuffer's handle_create hook, which doesn't
support multiple planes.

Thanks to Noralf's recent work, drivers can just store GEM objects
directly in drm_framebuffer. I use this directly in getfb2: we need
direct access to the GEM objects and not a vfunc in order to not hand
out duplicate GEM names for the same object.

This series converts all drivers except for nouveau, which was a
little too non-trivial for my comfort, to storing GEM objects directly
in drm_framebuffer. For those drivers whose driver_framebuffer struct
was nothing but drm_framebuffer + BO, it deletes the driver-specific
struct. It also makes use of Noralf's generic framebuffer helpers for
create_handle and destroy where possible.

I don't have the hardware for most of these drivers, so have had to
settle for just staring really hard at the diff.

I intend to remove create_handle when all drivers are converted over
to placing BOs directly inside drm_framebuffer. For most drivers
there's a relatively easy conversion to using the helpers for
basically all framebuffer handling and fbdev emulation as well, though
that's a bit further than I was willing to go without hardware to test
on ...

Cheers,
Daniel

[0]: https://lists.freedesktop.org/archives/dri-devel/2018-March/170512.html
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[PATCH 11/24] drm/tegra: Remove duplicate framebuffer num_planes

[Daniel Stone]

drm_framebuffer already stores num_planes for us.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: linux-tegra@vger.kernel.org
---
 drivers/gpu/drm/tegra/drm.h | 1 -
 drivers/gpu/drm/tegra/fb.c  | 6 ++----
 2 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/tegra/drm.h b/drivers/gpu/drm/tegra/drm.h
index 4f41aaec8530..79340fb1de43 100644
--- a/drivers/gpu/drm/tegra/drm.h
+++ b/drivers/gpu/drm/tegra/drm.h
@@ -32,7 +32,6 @@ struct reset_control;
 struct tegra_fb {
 	struct drm_framebuffer base;
 	struct tegra_bo **planes;
-	unsigned int num_planes;
 };
 
 #ifdef CONFIG_DRM_FBDEV_EMULATION
diff --git a/drivers/gpu/drm/tegra/fb.c b/drivers/gpu/drm/tegra/fb.c
index e69434909a42..75badf371721 100644
--- a/drivers/gpu/drm/tegra/fb.c
+++ b/drivers/gpu/drm/tegra/fb.c
@@ -107,7 +107,7 @@ static void tegra_fb_destroy(struct drm_framebuffer *framebuffer)
 	struct tegra_fb *fb = to_tegra_fb(framebuffer);
 	unsigned int i;
 
-	for (i = 0; i < fb->num_planes; i++) {
+	for (i = 0; i < framebuffer->format->num_planes; i++) {
 		struct tegra_bo *bo = fb->planes[i];
 
 		if (bo) {
@@ -155,11 +155,9 @@ static struct tegra_fb *tegra_fb_alloc(struct drm_device *drm,
 		return ERR_PTR(-ENOMEM);
 	}
 
-	fb->num_planes = num_planes;
-
 	drm_helper_mode_fill_fb_struct(drm, &fb->base, mode_cmd);
 
-	for (i = 0; i < fb->num_planes; i++)
+	for (i = 0; i < fb->base.format->num_planes; i++)
 		fb->planes[i] = planes[i];
 
 	err = drm_framebuffer_init(drm, &fb->base, &tegra_fb_funcs);
-- 
2.16.2

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[PATCH 12/24] drm/tegra: Move GEM BOs to drm_framebuffer

[Daniel Stone]

Since drm_framebuffer can now store GEM objects directly, place them
there rather than in our own subclass. As this makes the framebuffer
create_handle function the same as the GEM framebuffer helper, we
can reuse that.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: linux-tegra@vger.kernel.org
---
 drivers/gpu/drm/tegra/drm.h |  1 -
 drivers/gpu/drm/tegra/fb.c  | 37 ++++++++-----------------------------
 2 files changed, 8 insertions(+), 30 deletions(-)

diff --git a/drivers/gpu/drm/tegra/drm.h b/drivers/gpu/drm/tegra/drm.h
index 79340fb1de43..025e011d74af 100644
--- a/drivers/gpu/drm/tegra/drm.h
+++ b/drivers/gpu/drm/tegra/drm.h
@@ -31,7 +31,6 @@ struct reset_control;
 
 struct tegra_fb {
 	struct drm_framebuffer base;
-	struct tegra_bo **planes;
 };
 
 #ifdef CONFIG_DRM_FBDEV_EMULATION
diff --git a/drivers/gpu/drm/tegra/fb.c b/drivers/gpu/drm/tegra/fb.c
index 75badf371721..5bc8f968284c 100644
--- a/drivers/gpu/drm/tegra/fb.c
+++ b/drivers/gpu/drm/tegra/fb.c
@@ -14,6 +14,7 @@
 
 #include "drm.h"
 #include "gem.h"
+#include <drm/drm_gem_framebuffer_helper.h>
 
 static inline struct tegra_fb *to_tegra_fb(struct drm_framebuffer *fb)
 {
@@ -30,19 +31,14 @@ static inline struct tegra_fbdev *to_tegra_fbdev(struct drm_fb_helper *helper)
 struct tegra_bo *tegra_fb_get_plane(struct drm_framebuffer *framebuffer,
 				    unsigned int index)
 {
-	struct tegra_fb *fb = to_tegra_fb(framebuffer);
-
-	if (index >= framebuffer->format->num_planes)
-		return NULL;
-
-	return fb->planes[index];
+	return to_tegra_bo(drm_gem_fb_get_obj(framebuffer, index));
 }
 
 bool tegra_fb_is_bottom_up(struct drm_framebuffer *framebuffer)
 {
-	struct tegra_fb *fb = to_tegra_fb(framebuffer);
+	struct tegra_bo *bo = tegra_fb_get_plane(framebuffer, 0);
 
-	if (fb->planes[0]->flags & TEGRA_BO_BOTTOM_UP)
+	if (bo->flags & TEGRA_BO_BOTTOM_UP)
 		return true;
 
 	return false;
@@ -51,8 +47,7 @@ bool tegra_fb_is_bottom_up(struct drm_framebuffer *framebuffer)
 int tegra_fb_get_tiling(struct drm_framebuffer *framebuffer,
 			struct tegra_bo_tiling *tiling)
 {
-	struct tegra_fb *fb = to_tegra_fb(framebuffer);
-	uint64_t modifier = fb->base.modifier;
+	uint64_t modifier = framebuffer->modifier;
 
 	switch (modifier) {
 	case DRM_FORMAT_MOD_LINEAR:
@@ -108,7 +103,7 @@ static void tegra_fb_destroy(struct drm_framebuffer *framebuffer)
 	unsigned int i;
 
 	for (i = 0; i < framebuffer->format->num_planes; i++) {
-		struct tegra_bo *bo = fb->planes[i];
+		struct tegra_bo *bo = tegra_fb_get_plane(framebuffer, i);
 
 		if (bo) {
 			if (bo->pages)
@@ -119,21 +114,12 @@ static void tegra_fb_destroy(struct drm_framebuffer *framebuffer)
 	}
 
 	drm_framebuffer_cleanup(framebuffer);
-	kfree(fb->planes);
 	kfree(fb);
 }
 
-static int tegra_fb_create_handle(struct drm_framebuffer *framebuffer,
-				  struct drm_file *file, unsigned int *handle)
-{
-	struct tegra_fb *fb = to_tegra_fb(framebuffer);
-
-	return drm_gem_handle_create(file, &fb->planes[0]->gem, handle);
-}
-
 static const struct drm_framebuffer_funcs tegra_fb_funcs = {
 	.destroy = tegra_fb_destroy,
-	.create_handle = tegra_fb_create_handle,
+	.create_handle = drm_gem_fb_create_handle,
 };
 
 static struct tegra_fb *tegra_fb_alloc(struct drm_device *drm,
@@ -149,22 +135,15 @@ static struct tegra_fb *tegra_fb_alloc(struct drm_device *drm,
 	if (!fb)
 		return ERR_PTR(-ENOMEM);
 
-	fb->planes = kzalloc(num_planes * sizeof(*planes), GFP_KERNEL);
-	if (!fb->planes) {
-		kfree(fb);
-		return ERR_PTR(-ENOMEM);
-	}
-
 	drm_helper_mode_fill_fb_struct(drm, &fb->base, mode_cmd);
 
 	for (i = 0; i < fb->base.format->num_planes; i++)
-		fb->planes[i] = planes[i];
+		fb->base.obj[i] = &planes[i]->gem;
 
 	err = drm_framebuffer_init(drm, &fb->base, &tegra_fb_funcs);
 	if (err < 0) {
 		dev_err(drm->dev, "failed to initialize framebuffer: %d\n",
 			err);
-		kfree(fb->planes);
 		kfree(fb);
 		return ERR_PTR(err);
 	}
-- 
2.16.2

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[PATCH 13/24] drm/tegra: tegra_fb -> drm_framebuffer

[Daniel Stone]

Since tegra_fb is now the same as drm_framebuffer, we can just replace
the type completely.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: linux-tegra@vger.kernel.org
---
 drivers/gpu/drm/tegra/drm.h |  6 +-----
 drivers/gpu/drm/tegra/fb.c  | 34 ++++++++++++++--------------------
 2 files changed, 15 insertions(+), 25 deletions(-)

diff --git a/drivers/gpu/drm/tegra/drm.h b/drivers/gpu/drm/tegra/drm.h
index 025e011d74af..f1fc2cfc8f02 100644
--- a/drivers/gpu/drm/tegra/drm.h
+++ b/drivers/gpu/drm/tegra/drm.h
@@ -29,14 +29,10 @@
 
 struct reset_control;
 
-struct tegra_fb {
-	struct drm_framebuffer base;
-};
-
 #ifdef CONFIG_DRM_FBDEV_EMULATION
 struct tegra_fbdev {
 	struct drm_fb_helper base;
-	struct tegra_fb *fb;
+	struct drm_framebuffer *fb;
 };
 #endif
 
diff --git a/drivers/gpu/drm/tegra/fb.c b/drivers/gpu/drm/tegra/fb.c
index 5bc8f968284c..57da9683a713 100644
--- a/drivers/gpu/drm/tegra/fb.c
+++ b/drivers/gpu/drm/tegra/fb.c
@@ -16,11 +16,6 @@
 #include "gem.h"
 #include <drm/drm_gem_framebuffer_helper.h>
 
-static inline struct tegra_fb *to_tegra_fb(struct drm_framebuffer *fb)
-{
-	return container_of(fb, struct tegra_fb, base);
-}
-
 #ifdef CONFIG_DRM_FBDEV_EMULATION
 static inline struct tegra_fbdev *to_tegra_fbdev(struct drm_fb_helper *helper)
 {
@@ -99,7 +94,6 @@ int tegra_fb_get_tiling(struct drm_framebuffer *framebuffer,
 
 static void tegra_fb_destroy(struct drm_framebuffer *framebuffer)
 {
-	struct tegra_fb *fb = to_tegra_fb(framebuffer);
 	unsigned int i;
 
 	for (i = 0; i < framebuffer->format->num_planes; i++) {
@@ -114,7 +108,7 @@ static void tegra_fb_destroy(struct drm_framebuffer *framebuffer)
 	}
 
 	drm_framebuffer_cleanup(framebuffer);
-	kfree(fb);
+	kfree(framebuffer);
 }
 
 static const struct drm_framebuffer_funcs tegra_fb_funcs = {
@@ -122,12 +116,12 @@ static const struct drm_framebuffer_funcs tegra_fb_funcs = {
 	.create_handle = drm_gem_fb_create_handle,
 };
 
-static struct tegra_fb *tegra_fb_alloc(struct drm_device *drm,
-				       const struct drm_mode_fb_cmd2 *mode_cmd,
-				       struct tegra_bo **planes,
-				       unsigned int num_planes)
+static struct drm_framebuffer *tegra_fb_alloc(struct drm_device *drm,
+					      const struct drm_mode_fb_cmd2 *mode_cmd,
+					      struct tegra_bo **planes,
+					      unsigned int num_planes)
 {
-	struct tegra_fb *fb;
+	struct drm_framebuffer *fb;
 	unsigned int i;
 	int err;
 
@@ -135,12 +129,12 @@ static struct tegra_fb *tegra_fb_alloc(struct drm_device *drm,
 	if (!fb)
 		return ERR_PTR(-ENOMEM);
 
-	drm_helper_mode_fill_fb_struct(drm, &fb->base, mode_cmd);
+	drm_helper_mode_fill_fb_struct(drm, fb, mode_cmd);
 
-	for (i = 0; i < fb->base.format->num_planes; i++)
-		fb->base.obj[i] = &planes[i]->gem;
+	for (i = 0; i < fb->format->num_planes; i++)
+		fb->obj[i] = &planes[i]->gem;
 
-	err = drm_framebuffer_init(drm, &fb->base, &tegra_fb_funcs);
+	err = drm_framebuffer_init(drm, fb, &tegra_fb_funcs);
 	if (err < 0) {
 		dev_err(drm->dev, "failed to initialize framebuffer: %d\n",
 			err);
@@ -158,7 +152,7 @@ struct drm_framebuffer *tegra_fb_create(struct drm_device *drm,
 	unsigned int hsub, vsub, i;
 	struct tegra_bo *planes[4];
 	struct drm_gem_object *gem;
-	struct tegra_fb *fb;
+	struct drm_framebuffer *fb;
 	int err;
 
 	hsub = drm_format_horz_chroma_subsampling(cmd->pixel_format);
@@ -194,7 +188,7 @@ struct drm_framebuffer *tegra_fb_create(struct drm_device *drm,
 		goto unreference;
 	}
 
-	return &fb->base;
+	return fb;
 
 unreference:
 	while (i--)
@@ -275,7 +269,7 @@ static int tegra_fbdev_probe(struct drm_fb_helper *helper,
 		return PTR_ERR(fbdev->fb);
 	}
 
-	fb = &fbdev->fb->base;
+	fb = fbdev->fb;
 	helper->fb = fb;
 	helper->fbdev = info;
 
@@ -376,7 +370,7 @@ static void tegra_fbdev_exit(struct tegra_fbdev *fbdev)
 	drm_fb_helper_unregister_fbi(&fbdev->base);
 
 	if (fbdev->fb)
-		drm_framebuffer_remove(&fbdev->fb->base);
+		drm_framebuffer_remove(fbdev->fb);
 
 	drm_fb_helper_fini(&fbdev->base);
 	tegra_fbdev_free(fbdev);
-- 
2.16.2

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[PATCH 14/24] drm/tegra: Move fbdev unmap special case

[Daniel Stone]

User framebuffers are created with either bo->pages or bo->vaddr set,
depending on whether or not an IOMMU is present. On the other hand, the
framebuffer created for fbdev emulation has a vaddr mapping made if
bo->pages is set after creation. This is set up in fbdev probe.

Remove the special case unmapping from the general-purpose framebuffer
destroy, and move it to fbdev teardown.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: linux-tegra@vger.kernel.org
---
 drivers/gpu/drm/tegra/fb.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/tegra/fb.c b/drivers/gpu/drm/tegra/fb.c
index 57da9683a713..709aa6ef171a 100644
--- a/drivers/gpu/drm/tegra/fb.c
+++ b/drivers/gpu/drm/tegra/fb.c
@@ -99,12 +99,8 @@ static void tegra_fb_destroy(struct drm_framebuffer *framebuffer)
 	for (i = 0; i < framebuffer->format->num_planes; i++) {
 		struct tegra_bo *bo = tegra_fb_get_plane(framebuffer, i);
 
-		if (bo) {
-			if (bo->pages)
-				vunmap(bo->vaddr);
-
+		if (bo)
 			drm_gem_object_put_unlocked(&bo->gem);
-		}
 	}
 
 	drm_framebuffer_cleanup(framebuffer);
@@ -369,8 +365,17 @@ static void tegra_fbdev_exit(struct tegra_fbdev *fbdev)
 {
 	drm_fb_helper_unregister_fbi(&fbdev->base);
 
-	if (fbdev->fb)
+	if (fbdev->fb) {
+		struct tegra_bo *bo = tegra_fb_get_plane(fbdev->fb, 0);
+
+		/* Undo the special mapping we made in fbdev probe. */
+		if (bo && bo->pages) {
+			vunmap(bo->vaddr);
+			bo->vaddr = 0;
+		}
+
 		drm_framebuffer_remove(fbdev->fb);
+	}
 
 	drm_fb_helper_fini(&fbdev->base);
 	tegra_fbdev_free(fbdev);
-- 
2.16.2

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[PATCH 15/24] drm/tegra: Use drm_gem_fb_destroy

[Daniel Stone]

Now that our destroy function is the same as the helper, use that
directly.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: linux-tegra@vger.kernel.org
---
 drivers/gpu/drm/tegra/fb.c | 17 +----------------
 1 file changed, 1 insertion(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/tegra/fb.c b/drivers/gpu/drm/tegra/fb.c
index 709aa6ef171a..4c22cdded3c2 100644
--- a/drivers/gpu/drm/tegra/fb.c
+++ b/drivers/gpu/drm/tegra/fb.c
@@ -92,23 +92,8 @@ int tegra_fb_get_tiling(struct drm_framebuffer *framebuffer,
 	return 0;
 }
 
-static void tegra_fb_destroy(struct drm_framebuffer *framebuffer)
-{
-	unsigned int i;
-
-	for (i = 0; i < framebuffer->format->num_planes; i++) {
-		struct tegra_bo *bo = tegra_fb_get_plane(framebuffer, i);
-
-		if (bo)
-			drm_gem_object_put_unlocked(&bo->gem);
-	}
-
-	drm_framebuffer_cleanup(framebuffer);
-	kfree(framebuffer);
-}
-
 static const struct drm_framebuffer_funcs tegra_fb_funcs = {
-	.destroy = tegra_fb_destroy,
+	.destroy = drm_gem_fb_destroy,
 	.create_handle = drm_gem_fb_create_handle,
 };
 
-- 
2.16.2

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Re: [PATCH 00/24] drm_framebuffer boilerplate removal

[Alex Deucher]

On Fri, Mar 30, 2018 at 10:11 AM, Daniel Stone <daniels@collabora.com> wrote:
> Hi,
> I've been working on a getfb2[0] ioctl, which amongst other things
> supports multi-planar framebuffers as well as modifiers. getfb
> currently calls the framebuffer's handle_create hook, which doesn't
> support multiple planes.
>
> Thanks to Noralf's recent work, drivers can just store GEM objects
> directly in drm_framebuffer. I use this directly in getfb2: we need
> direct access to the GEM objects and not a vfunc in order to not hand
> out duplicate GEM names for the same object.
>
> This series converts all drivers except for nouveau, which was a
> little too non-trivial for my comfort, to storing GEM objects directly
> in drm_framebuffer. For those drivers whose driver_framebuffer struct
> was nothing but drm_framebuffer + BO, it deletes the driver-specific
> struct. It also makes use of Noralf's generic framebuffer helpers for
> create_handle and destroy where possible.
>
> I don't have the hardware for most of these drivers, so have had to
> settle for just staring really hard at the diff.
>
> I intend to remove create_handle when all drivers are converted over
> to placing BOs directly inside drm_framebuffer. For most drivers
> there's a relatively easy conversion to using the helpers for
> basically all framebuffer handling and fbdev emulation as well, though
> that's a bit further than I was willing to go without hardware to test
> on ...

Series is:
Acked-by: Alex Deucher <alexander.deucher@amd.com>

>
> Cheers,
> Daniel
>
> [0]: https://lists.freedesktop.org/archives/dri-devel/2018-March/170512.html
> _______________________________________________
> amd-gfx mailing list
> amd-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/amd-gfx
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Re: [PATCH 13/24] drm/tegra: tegra_fb -> drm_framebuffer

[Daniel Stone]

Hi Thierry,

On 30 March 2018 at 15:11, Daniel Stone <daniels@collabora.com> wrote:
> Since tegra_fb is now the same as drm_framebuffer, we can just replace
> the type completely.
>
> Signed-off-by: Daniel Stone <daniels@collabora.com>
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Cc: linux-tegra@vger.kernel.org

Did this still need some more testing, or is it OK to apply?

Cheers,
Daniel
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Re: [PATCH 13/24] drm/tegra: tegra_fb -> drm_framebuffer

[Thierry Reding]

[-- Attachment #1.1: Type: text/plain, Size: 632 bytes --]

On Thu, May 17, 2018 at 02:11:16PM +0100, Daniel Stone wrote:
> Hi Thierry,
> 
> On 30 March 2018 at 15:11, Daniel Stone <daniels@collabora.com> wrote:
> > Since tegra_fb is now the same as drm_framebuffer, we can just replace
> > the type completely.
> >
> > Signed-off-by: Daniel Stone <daniels@collabora.com>
> > Cc: Thierry Reding <thierry.reding@gmail.com>
> > Cc: linux-tegra@vger.kernel.org
> 
> Did this still need some more testing, or is it OK to apply?

Sorry, this completely fell off the table. I've tested patches 11-15 and
they work fine. Applied all of them to drm/tegra/for-next.

Thanks,
Thierry

[-- Attachment #1.2: signature.asc --]
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[-- Attachment #2: Type: text/plain, Size: 160 bytes --]

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