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Message-ID: <8a7bf59a-0f58-21ba-8b82-78e6ba873065@tronnes.org>
Date: Wed, 9 Aug 2017 21:14:48 +0200
From: Noralf Trønnes <noralf@...nnes.org>
To: Joe Kniss <djmk@...omium.org>, dri-devel@...ts.freedesktop.org
Cc: alexander.deucher@....com, airlied@...ux.ie, linux@...linux.org.uk,
daniel.vetter@...el.com, jani.nikula@...ux.intel.com,
seanpaul@...omium.org, inki.dae@...sung.com,
jy0922.shim@...sung.com, sw0312.kim@...sung.com,
kyungmin.park@...sung.com, kgene@...nel.org, krzk@...nel.org,
patrik.r.jakobsson@...il.com, ck.hu@...iatek.com,
p.zabel@...gutronix.de, matthias.bgg@...il.com,
robdclark@...il.com, bskeggs@...hat.com, tomi.valkeinen@...com,
airlied@...hat.com, kraxel@...hat.com, mark.yao@...k-chips.com,
heiko@...ech.de, thierry.reding@...il.com, jonathanh@...dia.com,
Monk.Liu@....com, David1.Zhou@....com, tom.stdenis@....com,
ray.huang@....com, Ken.Wang@....com, Jerry.Zhang@....com,
michel.daenzer@....com, harry.wentland@....com,
Andrey.Grodzovsky@....com, AlexBin.Xie@....com,
funfunctor@...klore1984.net, Rex.Zhu@....com, Pixel.Ding@....com,
laurent.pinchart@...asonboard.com, contact@...fanchrist.eu,
Emily.Deng@....com, mario.kleiner.de@...il.com, eric@...estrom.ch,
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alexandre.f.demers@...il.com, yamada.masahiro@...ionext.com,
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Joe Kniss <djmk@...gle.com>
Subject: Re: [PATCH libdrm] drm: Remove create_handle() drm_framebuffer
"virtual".
Den 09.08.2017 01.42, skrev Joe Kniss:
> Because all drivers currently use gem objects for framebuffer planes,
> the virtual create_handle() is not required. This change adds a
> struct drm_gem_object *gems[4] field to drm_framebuffer and removes
> create_handle() function pointer from drm_framebuffer_funcs. The
> corresponding *_create_handle() function is removed from each driver.
>
> In many cases this change eliminates a struct *_framebuffer object,
> as the only need for the derived struct is the addition of the gem
> object pointer.
>
> TESTED: compiled: allyesconfig ARCH=x86,arm platforms:i915, rockchip
>
> Signed-off-by: Joe Kniss <djmk@...gle.com>
> ---
Hi Joe,
I'm also looking into adding gem objs to drm_framebuffer in this patch:
[PATCH v2 01/22] drm: Add GEM backed framebuffer library
https://lists.freedesktop.org/archives/dri-devel/2017-August/149782.html
[...]
> diff --git a/drivers/gpu/drm/drm_fb_cma_helper.c b/drivers/gpu/drm/drm_fb_cma_helper.c
> index ade319d10e70..f5f011b910b1 100644
> --- a/drivers/gpu/drm/drm_fb_cma_helper.c
> +++ b/drivers/gpu/drm/drm_fb_cma_helper.c
> @@ -31,14 +31,9 @@
>
> #define DEFAULT_FBDEFIO_DELAY_MS 50
>
> -struct drm_fb_cma {
> - struct drm_framebuffer fb;
> - struct drm_gem_cma_object *obj[4];
> -};
> -
> struct drm_fbdev_cma {
> struct drm_fb_helper fb_helper;
> - struct drm_fb_cma *fb;
> + struct drm_framebuffer *fb;
This fb pointer isn't necessary, since fb_helper already has one.
Noralf.
> const struct drm_framebuffer_funcs *fb_funcs;
> };
>
> @@ -72,7 +67,6 @@ struct drm_fbdev_cma {
> *
> * static struct drm_framebuffer_funcs driver_fb_funcs = {
> * .destroy = drm_fb_cma_destroy,
> - * .create_handle = drm_fb_cma_create_handle,
> * .dirty = driver_fb_dirty,
> * };
> *
> @@ -90,67 +84,50 @@ static inline struct drm_fbdev_cma *to_fbdev_cma(struct drm_fb_helper *helper)
> return container_of(helper, struct drm_fbdev_cma, fb_helper);
> }
>
> -static inline struct drm_fb_cma *to_fb_cma(struct drm_framebuffer *fb)
> -{
> - return container_of(fb, struct drm_fb_cma, fb);
> -}
> -
> void drm_fb_cma_destroy(struct drm_framebuffer *fb)
> {
> - struct drm_fb_cma *fb_cma = to_fb_cma(fb);
> int i;
>
> for (i = 0; i < 4; i++) {
> - if (fb_cma->obj[i])
> - drm_gem_object_put_unlocked(&fb_cma->obj[i]->base);
> + if (fb->gem_objs[i])
> + drm_gem_object_put_unlocked(fb->gem_objs[i]);
> }
>
> drm_framebuffer_cleanup(fb);
> - kfree(fb_cma);
> + kfree(fb);
> }
> EXPORT_SYMBOL(drm_fb_cma_destroy);
>
> -int drm_fb_cma_create_handle(struct drm_framebuffer *fb,
> - struct drm_file *file_priv, unsigned int *handle)
> -{
> - struct drm_fb_cma *fb_cma = to_fb_cma(fb);
> -
> - return drm_gem_handle_create(file_priv,
> - &fb_cma->obj[0]->base, handle);
> -}
> -EXPORT_SYMBOL(drm_fb_cma_create_handle);
> -
> static struct drm_framebuffer_funcs drm_fb_cma_funcs = {
> .destroy = drm_fb_cma_destroy,
> - .create_handle = drm_fb_cma_create_handle,
> };
>
> -static struct drm_fb_cma *drm_fb_cma_alloc(struct drm_device *dev,
> +static struct drm_framebuffer *drm_fb_cma_alloc(struct drm_device *dev,
> const struct drm_mode_fb_cmd2 *mode_cmd,
> struct drm_gem_cma_object **obj,
> unsigned int num_planes, const struct drm_framebuffer_funcs *funcs)
> {
> - struct drm_fb_cma *fb_cma;
> + struct drm_framebuffer *fb;
> int ret;
> int i;
>
> - fb_cma = kzalloc(sizeof(*fb_cma), GFP_KERNEL);
> - if (!fb_cma)
> + fb = kzalloc(sizeof(*fb), GFP_KERNEL);
> + if (!fb)
> return ERR_PTR(-ENOMEM);
>
> - drm_helper_mode_fill_fb_struct(dev, &fb_cma->fb, mode_cmd);
> + drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
>
> for (i = 0; i < num_planes; i++)
> - fb_cma->obj[i] = obj[i];
> + fb->gem_objs[i] = &obj[i]->base;
>
> - ret = drm_framebuffer_init(dev, &fb_cma->fb, funcs);
> + ret = drm_framebuffer_init(dev, fb, funcs);
> if (ret) {
> dev_err(dev->dev, "Failed to initialize framebuffer: %d\n", ret);
> - kfree(fb_cma);
> + kfree(fb);
> return ERR_PTR(ret);
> }
>
> - return fb_cma;
> + return fb;
> }
>
> /**
> @@ -171,7 +148,7 @@ struct drm_framebuffer *drm_fb_cma_create_with_funcs(struct drm_device *dev,
> const struct drm_framebuffer_funcs *funcs)
> {
> const struct drm_format_info *info;
> - struct drm_fb_cma *fb_cma;
> + struct drm_framebuffer *fb;
> struct drm_gem_cma_object *objs[4];
> struct drm_gem_object *obj;
> int ret;
> @@ -205,13 +182,13 @@ struct drm_framebuffer *drm_fb_cma_create_with_funcs(struct drm_device *dev,
> objs[i] = to_drm_gem_cma_obj(obj);
> }
>
> - fb_cma = drm_fb_cma_alloc(dev, mode_cmd, objs, i, funcs);
> - if (IS_ERR(fb_cma)) {
> - ret = PTR_ERR(fb_cma);
> + fb = drm_fb_cma_alloc(dev, mode_cmd, objs, i, funcs);
> + if (IS_ERR(fb)) {
> + ret = PTR_ERR(fb);
> goto err_gem_object_put;
> }
>
> - return &fb_cma->fb;
> + return fb;
>
> err_gem_object_put:
> for (i--; i >= 0; i--)
> @@ -250,12 +227,10 @@ EXPORT_SYMBOL_GPL(drm_fb_cma_create);
> struct drm_gem_cma_object *drm_fb_cma_get_gem_obj(struct drm_framebuffer *fb,
> unsigned int plane)
> {
> - struct drm_fb_cma *fb_cma = to_fb_cma(fb);
> -
> if (plane >= 4)
> return NULL;
>
> - return fb_cma->obj[plane];
> + return to_drm_gem_cma_obj(fb->gem_objs[plane]);
> }
> EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_obj);
>
> @@ -272,13 +247,13 @@ dma_addr_t drm_fb_cma_get_gem_addr(struct drm_framebuffer *fb,
> struct drm_plane_state *state,
> unsigned int plane)
> {
> - struct drm_fb_cma *fb_cma = to_fb_cma(fb);
> + struct drm_gem_cma_object *cma_bo = drm_fb_cma_get_gem_obj(fb, plane);
> dma_addr_t paddr;
>
> - if (plane >= 4)
> + if (!cma_bo)
> return 0;
>
> - paddr = fb_cma->obj[plane]->paddr + fb->offsets[plane];
> + paddr = cma_bo->paddr + fb->offsets[plane];
> paddr += fb->format->cpp[plane] * (state->src_x >> 16);
> paddr += fb->pitches[plane] * (state->src_y >> 16);
>
> @@ -321,7 +296,6 @@ EXPORT_SYMBOL_GPL(drm_fb_cma_prepare_fb);
> #ifdef CONFIG_DEBUG_FS
> static void drm_fb_cma_describe(struct drm_framebuffer *fb, struct seq_file *m)
> {
> - struct drm_fb_cma *fb_cma = to_fb_cma(fb);
> int i;
>
> seq_printf(m, "fb: %dx%d@...4s\n", fb->width, fb->height,
> @@ -330,7 +304,7 @@ static void drm_fb_cma_describe(struct drm_framebuffer *fb, struct seq_file *m)
> for (i = 0; i < fb->format->num_planes; i++) {
> seq_printf(m, " %d: offset=%d pitch=%d, obj: ",
> i, fb->offsets[i], fb->pitches[i]);
> - drm_gem_cma_describe(fb_cma->obj[i], m);
> + drm_gem_cma_describe(drm_fb_cma_get_gem_obj(fb, i), m);
> }
> }
>
> @@ -472,7 +446,7 @@ drm_fbdev_cma_create(struct drm_fb_helper *helper,
> goto err_fb_info_destroy;
> }
>
> - fb = &fbdev_cma->fb->fb;
> + fb = fbdev_cma->fb;
> helper->fb = fb;
>
> fbi->par = helper;
> @@ -500,7 +474,7 @@ drm_fbdev_cma_create(struct drm_fb_helper *helper,
> return 0;
>
> err_cma_destroy:
> - drm_framebuffer_remove(&fbdev_cma->fb->fb);
> + drm_framebuffer_remove(fbdev_cma->fb);
> err_fb_info_destroy:
> drm_fb_helper_fini(helper);
> err_gem_free_object:
> @@ -598,7 +572,7 @@ void drm_fbdev_cma_fini(struct drm_fbdev_cma *fbdev_cma)
> drm_fbdev_cma_defio_fini(fbdev_cma->fb_helper.fbdev);
>
> if (fbdev_cma->fb)
> - drm_framebuffer_remove(&fbdev_cma->fb->fb);
> + drm_framebuffer_remove(fbdev_cma->fb);
>
> drm_fb_helper_fini(&fbdev_cma->fb_helper);
> kfree(fbdev_cma);
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