[PATCH v2 02/22] drm/fb-cma-helper: Use drm_gem_framebuffer_helper
Daniel Vetter
daniel at ffwll.ch
Fri Aug 11 07:49:42 UTC 2017
On Thu, Aug 10, 2017 at 09:04:34PM +0200, Noralf Trønnes wrote:
>
> Den 09.08.2017 22.07, skrev Daniel Vetter:
> > On Wed, Aug 09, 2017 at 12:11:05PM +0200, Noralf Trønnes wrote:
> > > Use the new drm_gem_framebuffer_helper who's code was copied
> > > from this helper.
> > >
> > > Signed-off-by: Noralf Trønnes <noralf at tronnes.org>
> > > ---
> > > drivers/gpu/drm/drm_fb_cma_helper.c | 172 +++++++-----------------------------
> > > 1 file changed, 30 insertions(+), 142 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/drm_fb_cma_helper.c b/drivers/gpu/drm/drm_fb_cma_helper.c
> > > index ade319d..d0c0110 100644
> > > --- a/drivers/gpu/drm/drm_fb_cma_helper.c
> > > +++ b/drivers/gpu/drm/drm_fb_cma_helper.c
> > > @@ -18,27 +18,17 @@
> > > */
> > > #include <drm/drmP.h>
> > > -#include <drm/drm_atomic.h>
> > > -#include <drm/drm_crtc.h>
> > > #include <drm/drm_fb_helper.h>
> > > -#include <drm/drm_crtc_helper.h>
> > > +#include <drm/drm_framebuffer.h>
> > > #include <drm/drm_gem_cma_helper.h>
> > > +#include <drm/drm_gem_framebuffer_helper.h>
> > > #include <drm/drm_fb_cma_helper.h>
> > > -#include <linux/dma-buf.h>
> > > -#include <linux/dma-mapping.h>
> > > #include <linux/module.h>
> > > -#include <linux/reservation.h>
> > > #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;
> > > const struct drm_framebuffer_funcs *fb_funcs;
> > > };
> > > @@ -90,69 +80,19 @@ 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);
> > > - }
> > > -
> > > - drm_framebuffer_cleanup(fb);
> > > - kfree(fb_cma);
> > > + drm_gem_fb_destroy(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);
> > > + return drm_gem_fb_create_handle(fb, file_priv, 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,
> > > - 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;
> > > - int ret;
> > > - int i;
> > > -
> > > - fb_cma = kzalloc(sizeof(*fb_cma), GFP_KERNEL);
> > > - if (!fb_cma)
> > > - return ERR_PTR(-ENOMEM);
> > > -
> > > - drm_helper_mode_fill_fb_struct(dev, &fb_cma->fb, mode_cmd);
> > > -
> > > - for (i = 0; i < num_planes; i++)
> > > - fb_cma->obj[i] = obj[i];
> > > -
> > > - ret = drm_framebuffer_init(dev, &fb_cma->fb, funcs);
> > > - if (ret) {
> > > - dev_err(dev->dev, "Failed to initialize framebuffer: %d\n", ret);
> > > - kfree(fb_cma);
> > > - return ERR_PTR(ret);
> > > - }
> > > -
> > > - return fb_cma;
> > > -}
> > > -
> > > /**
> > > * drm_fb_cma_create_with_funcs() - helper function for the
> > > * &drm_mode_config_funcs.fb_create
> > > @@ -170,53 +110,7 @@ struct drm_framebuffer *drm_fb_cma_create_with_funcs(struct drm_device *dev,
> > > struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd,
> > > const struct drm_framebuffer_funcs *funcs)
> > > {
> > > - const struct drm_format_info *info;
> > > - struct drm_fb_cma *fb_cma;
> > > - struct drm_gem_cma_object *objs[4];
> > > - struct drm_gem_object *obj;
> > > - int ret;
> > > - int i;
> > > -
> > > - info = drm_get_format_info(dev, mode_cmd);
> > > - if (!info)
> > > - return ERR_PTR(-EINVAL);
> > > -
> > > - for (i = 0; i < info->num_planes; i++) {
> > > - unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
> > > - unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
> > > - unsigned int min_size;
> > > -
> > > - obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[i]);
> > > - if (!obj) {
> > > - dev_err(dev->dev, "Failed to lookup GEM object\n");
> > > - ret = -ENOENT;
> > > - goto err_gem_object_put;
> > > - }
> > > -
> > > - min_size = (height - 1) * mode_cmd->pitches[i]
> > > - + width * info->cpp[i]
> > > - + mode_cmd->offsets[i];
> > > -
> > > - if (obj->size < min_size) {
> > > - drm_gem_object_put_unlocked(obj);
> > > - ret = -EINVAL;
> > > - goto err_gem_object_put;
> > > - }
> > > - 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);
> > > - goto err_gem_object_put;
> > > - }
> > > -
> > > - return &fb_cma->fb;
> > > -
> > > -err_gem_object_put:
> > > - for (i--; i >= 0; i--)
> > > - drm_gem_object_put_unlocked(&objs[i]->base);
> > > - return ERR_PTR(ret);
> > > + return drm_gem_fb_create_with_funcs(dev, file_priv, mode_cmd, funcs);
> > > }
> > > EXPORT_SYMBOL_GPL(drm_fb_cma_create_with_funcs);
> > > @@ -233,8 +127,7 @@ EXPORT_SYMBOL_GPL(drm_fb_cma_create_with_funcs);
> > > struct drm_framebuffer *drm_fb_cma_create(struct drm_device *dev,
> > > struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd)
> > > {
> > > - return drm_fb_cma_create_with_funcs(dev, file_priv, mode_cmd,
> > > - &drm_fb_cma_funcs);
> > > + return drm_gem_fb_create(dev, file_priv, mode_cmd);
> > > }
> > > EXPORT_SYMBOL_GPL(drm_fb_cma_create);
> > > @@ -250,12 +143,14 @@ 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);
> > > + struct drm_gem_object *gem;
> > > - if (plane >= 4)
> > > + gem = drm_gem_fb_get_obj(fb, plane);
> > > + if (!gem)
> > > return NULL;
> > > - return fb_cma->obj[plane];
> > > + return to_drm_gem_cma_obj(gem);
> > > +
> > > }
> > > EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_obj);
> > > @@ -272,13 +167,14 @@ 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 *obj;
> > > dma_addr_t paddr;
> > > - if (plane >= 4)
> > > + obj = drm_fb_cma_get_gem_obj(fb, plane);
> > > + if (!obj)
> > > return 0;
> > > - paddr = fb_cma->obj[plane]->paddr + fb->offsets[plane];
> > > + paddr = obj->paddr + fb->offsets[plane];
> > > paddr += fb->format->cpp[plane] * (state->src_x >> 16);
> > > paddr += fb->pitches[plane] * (state->src_y >> 16);
> > > @@ -302,26 +198,13 @@ EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_addr);
> > > int drm_fb_cma_prepare_fb(struct drm_plane *plane,
> > > struct drm_plane_state *state)
> > > {
> > > - struct dma_buf *dma_buf;
> > > - struct dma_fence *fence;
> > > -
> > > - if ((plane->state->fb == state->fb) || !state->fb)
> > > - return 0;
> > > -
> > > - dma_buf = drm_fb_cma_get_gem_obj(state->fb, 0)->base.dma_buf;
> > > - if (dma_buf) {
> > > - fence = reservation_object_get_excl_rcu(dma_buf->resv);
> > > - drm_atomic_set_fence_for_plane(state, fence);
> > > - }
> > > -
> > > - return 0;
> > > + return drm_gem_fb_prepare_fb(plane, state);
> > > }
> > > 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@%4.4s\n", fb->width, fb->height,
> > > @@ -330,7 +213,7 @@ 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);
> > > }
> > > }
> > > @@ -434,6 +317,7 @@ drm_fbdev_cma_create(struct drm_fb_helper *helper,
> > > struct drm_mode_fb_cmd2 mode_cmd = { 0 };
> > > struct drm_device *dev = helper->dev;
> > > struct drm_gem_cma_object *obj;
> > > + struct drm_gem_object *gem;
> > > struct drm_framebuffer *fb;
> > > unsigned int bytes_per_pixel;
> > > unsigned long offset;
> > > @@ -464,15 +348,14 @@ drm_fbdev_cma_create(struct drm_fb_helper *helper,
> > > goto err_gem_free_object;
> > > }
> > > - fbdev_cma->fb = drm_fb_cma_alloc(dev, &mode_cmd, &obj, 1,
> > > - fbdev_cma->fb_funcs);
> > > - if (IS_ERR(fbdev_cma->fb)) {
> > > + gem = &obj->base;
> > > + fb = drm_gem_fb_alloc(dev, &mode_cmd, &gem, 1, fbdev_cma->fb_funcs);
> > > + if (IS_ERR(fb)) {
> > > dev_err(dev->dev, "Failed to allocate DRM framebuffer.\n");
> > > - ret = PTR_ERR(fbdev_cma->fb);
> > > + ret = PTR_ERR(fb);
> > > goto err_fb_info_destroy;
> > > }
> > > - fb = &fbdev_cma->fb->fb;
> > > helper->fb = fb;
> > > fbi->par = helper;
> > > @@ -500,7 +383,7 @@ drm_fbdev_cma_create(struct drm_fb_helper *helper,
> > > return 0;
> > > err_cma_destroy:
> > > - drm_framebuffer_remove(&fbdev_cma->fb->fb);
> > > + drm_framebuffer_remove(fb);
> > > err_fb_info_destroy:
> > > drm_fb_helper_fini(helper);
> > > err_gem_free_object:
> > > @@ -570,6 +453,11 @@ struct drm_fbdev_cma *drm_fbdev_cma_init_with_funcs(struct drm_device *dev,
> > > }
> > > EXPORT_SYMBOL_GPL(drm_fbdev_cma_init_with_funcs);
> > > +static const struct drm_framebuffer_funcs drm_fb_cma_funcs = {
> > > + .destroy = drm_gem_fb_destroy,
> > > + .create_handle = drm_gem_fb_create_handle,
> > > +};
> > I don't see you removing this in the very last patch. It exactly matches
> > the function table the gem fb helper provides, why do we need this dupe
> > here?
>
> It's used by drm_fbdev_cma_init(). To avoid this I either have to export
> the structure from drm_gem_framebuffer_helper and use that, or let the
> funcs argument to drm_gem_fb_create_with_funcs() be optional and through
> that end up with the drm_gem_framebuffer_helper version as a default.
>
> I really hope that we can find a way to give fb_helper a struct drm_file,
> so we don't need to have these special functions for fbdev emulation.
> We could just call .dumb_create and .fb_create.
Not sure we discussed this, but iirc the prep work from David Herrmann to
allow creating a drm_file without a struct file backing it has landed. But
that's definitely long-term plans, I just wanted to know why we need this.
I don't think over-polishing this stuff already makes sense, better to get
your big patch series in first.
-Daniel
>
> Noralf.
>
>
> > -Daniel
> >
> > > +
> > > /**
> > > * drm_fbdev_cma_init() - Allocate and initializes a drm_fbdev_cma struct
> > > * @dev: DRM device
> > > @@ -597,8 +485,8 @@ void drm_fbdev_cma_fini(struct drm_fbdev_cma *fbdev_cma)
> > > if (fbdev_cma->fb_helper.fbdev)
> > > drm_fbdev_cma_defio_fini(fbdev_cma->fb_helper.fbdev);
> > > - if (fbdev_cma->fb)
> > > - drm_framebuffer_remove(&fbdev_cma->fb->fb);
> > > + if (fbdev_cma->fb_helper.fb)
> > > + drm_framebuffer_remove(fbdev_cma->fb_helper.fb);
> > > drm_fb_helper_fini(&fbdev_cma->fb_helper);
> > > kfree(fbdev_cma);
> > > --
> > > 2.7.4
> > >
> > > _______________________________________________
> > > dri-devel mailing list
> > > dri-devel at lists.freedesktop.org
> > > https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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