[PATCH v2 02/22] drm/cma-helper: Add drm_fb_cma_fbdev_init/fini()
Daniel Vetter
daniel at ffwll.ch
Thu Dec 7 14:55:20 UTC 2017
On Thu, Dec 07, 2017 at 02:09:40PM +0100, Noralf Trønnes wrote:
> Daniel,
>
> There's no response from Laurent, can I go ahead and start applying?
He's usually fairly responsive to a ping on irc, but yeah I think this is
plenty time, and it's a simple change. Imo good to go.
-Daniel
>
> Noralf.
>
>
> Den 30.11.2017 18.38, skrev Noralf Trønnes:
> > Laurent,
> >
> > Can you please have a look at this and see if it's ok with you?
> >
> > Noralf.
> >
> >
> > Den 15.11.2017 15.19, skrev Noralf Trønnes:
> > > Add functions drm_fb_cma_fbdev_init(), drm_fb_cma_fbdev_fini() and
> > > drm_fb_cma_fbdev_init_with_funcs(). These functions relies on the fact
> > > that the drm_fb_helper struct is stored in dev->drm_fb_helper_private
> > > so drivers don't need to store it.
> > >
> > > Cc: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> > > Signed-off-by: Noralf Trønnes <noralf at tronnes.org>
> > > Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> > > ---
> > >
> > > Changes since version 1:
> > > - Fix NULL pointer dereference in drm_fbdev_cma_create() (Benjamin)
> > >
> > > drivers/gpu/drm/drm_fb_cma_helper.c | 119
> > > +++++++++++++++++++++++++++++++++++-
> > > include/drm/drm_fb_cma_helper.h | 7 +++
> > > 2 files changed, 123 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/drm_fb_cma_helper.c
> > > b/drivers/gpu/drm/drm_fb_cma_helper.c
> > > index 35b56dfba929..186d00adfb5f 100644
> > > --- a/drivers/gpu/drm/drm_fb_cma_helper.c
> > > +++ b/drivers/gpu/drm/drm_fb_cma_helper.c
> > > @@ -23,6 +23,7 @@
> > > #include <drm/drm_gem_cma_helper.h>
> > > #include <drm/drm_gem_framebuffer_helper.h>
> > > #include <drm/drm_fb_cma_helper.h>
> > > +#include <drm/drm_print.h>
> > > #include <linux/module.h>
> > > #define DEFAULT_FBDEFIO_DELAY_MS 50
> > > @@ -42,7 +43,7 @@ struct drm_fbdev_cma {
> > > * callback function to create a cma backed framebuffer.
> > > *
> > > * An fbdev framebuffer backed by cma is also available by calling
> > > - * drm_fbdev_cma_init(). drm_fbdev_cma_fini() tears it down.
> > > + * drm_fb_cma_fbdev_init(). drm_fb_cma_fbdev_fini() tears it down.
> > > * If the &drm_framebuffer_funcs.dirty callback is set,
> > > fb_deferred_io will be
> > > * set up automatically. &drm_framebuffer_funcs.dirty is called by
> > > * drm_fb_helper_deferred_io() in process context (&struct
> > > delayed_work).
> > > @@ -68,7 +69,7 @@ struct drm_fbdev_cma {
> > > *
> > > * Initialize::
> > > *
> > > - * fbdev = drm_fbdev_cma_init_with_funcs(dev, 16,
> > > + * fbdev = drm_fb_cma_fbdev_init_with_funcs(dev, 16,
> > > * dev->mode_config.num_crtc,
> > > * dev->mode_config.num_connector,
> > > * &driver_fb_funcs);
> > > @@ -256,7 +257,7 @@ drm_fbdev_cma_create(struct drm_fb_helper *helper,
> > > fbi->screen_size = size;
> > > fbi->fix.smem_len = size;
> > > - if (fbdev_cma->fb_funcs->dirty) {
> > > + if (fb->funcs->dirty) {
> > > ret = drm_fbdev_cma_defio_init(fbi, obj);
> > > if (ret)
> > > goto err_cma_destroy;
> > > @@ -277,6 +278,118 @@ static const struct drm_fb_helper_funcs
> > > drm_fb_cma_helper_funcs = {
> > > .fb_probe = drm_fbdev_cma_create,
> > > };
> > > +/**
> > > + * drm_fb_cma_fbdev_init_with_funcs() - Allocate and initialize
> > > fbdev emulation
> > > + * @dev: DRM device
> > > + * @preferred_bpp: Preferred bits per pixel for the device.
> > > + * @dev->mode_config.preferred_depth is used if
> > > this is zero.
> > > + * @max_conn_count: Maximum number of connectors.
> > > + * @dev->mode_config.num_connector is used if this
> > > is zero.
> > > + * @funcs: Framebuffer functions, in particular a custom dirty()
> > > callback.
> > > + * Can be NULL.
> > > + *
> > > + * Returns:
> > > + * Zero on success or negative error code on failure.
> > > + */
> > > +int drm_fb_cma_fbdev_init_with_funcs(struct drm_device *dev,
> > > + unsigned int preferred_bpp, unsigned int max_conn_count,
> > > + const struct drm_framebuffer_funcs *funcs)
> > > +{
> > > + struct drm_fbdev_cma *fbdev_cma;
> > > + struct drm_fb_helper *fb_helper;
> > > + int ret;
> > > +
> > > + if (!preferred_bpp)
> > > + preferred_bpp = dev->mode_config.preferred_depth;
> > > + if (!preferred_bpp)
> > > + preferred_bpp = 32;
> > > +
> > > + if (!max_conn_count)
> > > + max_conn_count = dev->mode_config.num_connector;
> > > +
> > > + fbdev_cma = kzalloc(sizeof(*fbdev_cma), GFP_KERNEL);
> > > + if (!fbdev_cma)
> > > + return -ENOMEM;
> > > +
> > > + fbdev_cma->fb_funcs = funcs;
> > > + fb_helper = &fbdev_cma->fb_helper;
> > > +
> > > + drm_fb_helper_prepare(dev, fb_helper, &drm_fb_cma_helper_funcs);
> > > +
> > > + ret = drm_fb_helper_init(dev, fb_helper, max_conn_count);
> > > + if (ret < 0) {
> > > + DRM_DEV_ERROR(dev->dev, "Failed to initialize fbdev
> > > helper.\n");
> > > + goto err_free;
> > > + }
> > > +
> > > + ret = drm_fb_helper_single_add_all_connectors(fb_helper);
> > > + if (ret < 0) {
> > > + DRM_DEV_ERROR(dev->dev, "Failed to add connectors.\n");
> > > + goto err_drm_fb_helper_fini;
> > > + }
> > > +
> > > + ret = drm_fb_helper_initial_config(fb_helper, preferred_bpp);
> > > + if (ret < 0) {
> > > + DRM_DEV_ERROR(dev->dev, "Failed to set fbdev
> > > configuration.\n");
> > > + goto err_drm_fb_helper_fini;
> > > + }
> > > +
> > > + return 0;
> > > +
> > > +err_drm_fb_helper_fini:
> > > + drm_fb_helper_fini(fb_helper);
> > > +err_free:
> > > + kfree(fbdev_cma);
> > > +
> > > + return ret;
> > > +}
> > > +EXPORT_SYMBOL_GPL(drm_fb_cma_fbdev_init_with_funcs);
> > > +
> > > +/**
> > > + * drm_fb_cma_fbdev_init() - Allocate and initialize fbdev emulation
> > > + * @dev: DRM device
> > > + * @preferred_bpp: Preferred bits per pixel for the device.
> > > + * @dev->mode_config.preferred_depth is used if
> > > this is zero.
> > > + * @max_conn_count: Maximum number of connectors.
> > > + * @dev->mode_config.num_connector is used if this
> > > is zero.
> > > + *
> > > + * Returns:
> > > + * Zero on success or negative error code on failure.
> > > + */
> > > +int drm_fb_cma_fbdev_init(struct drm_device *dev, unsigned int
> > > preferred_bpp,
> > > + unsigned int max_conn_count)
> > > +{
> > > + return drm_fb_cma_fbdev_init_with_funcs(dev, preferred_bpp,
> > > + max_conn_count, NULL);
> > > +}
> > > +EXPORT_SYMBOL_GPL(drm_fb_cma_fbdev_init);
> > > +
> > > +/**
> > > + * drm_fb_cma_fbdev_fini() - Teardown fbdev emulation
> > > + * @dev: DRM device
> > > + */
> > > +void drm_fb_cma_fbdev_fini(struct drm_device *dev)
> > > +{
> > > + struct drm_fb_helper *fb_helper = dev->fb_helper;
> > > +
> > > + if (!fb_helper)
> > > + return;
> > > +
> > > + /* Unregister if it hasn't been done already */
> > > + if (fb_helper->fbdev && fb_helper->fbdev->dev)
> > > + drm_fb_helper_unregister_fbi(fb_helper);
> > > +
> > > + if (fb_helper->fbdev)
> > > + drm_fbdev_cma_defio_fini(fb_helper->fbdev);
> > > +
> > > + if (fb_helper->fb)
> > > + drm_framebuffer_remove(fb_helper->fb);
> > > +
> > > + drm_fb_helper_fini(fb_helper);
> > > + kfree(to_fbdev_cma(fb_helper));
> > > +}
> > > +EXPORT_SYMBOL_GPL(drm_fb_cma_fbdev_fini);
> > > +
> > > /**
> > > * drm_fbdev_cma_init_with_funcs() - Allocate and initializes a
> > > drm_fbdev_cma struct
> > > * @dev: DRM device
> > > diff --git a/include/drm/drm_fb_cma_helper.h
> > > b/include/drm/drm_fb_cma_helper.h
> > > index a613ff022e6c..4fb2d5563420 100644
> > > --- a/include/drm/drm_fb_cma_helper.h
> > > +++ b/include/drm/drm_fb_cma_helper.h
> > > @@ -15,6 +15,13 @@ struct drm_mode_fb_cmd2;
> > > struct drm_plane;
> > > struct drm_plane_state;
> > > +int drm_fb_cma_fbdev_init_with_funcs(struct drm_device *dev,
> > > + unsigned int preferred_bpp, unsigned int max_conn_count,
> > > + const struct drm_framebuffer_funcs *funcs);
> > > +int drm_fb_cma_fbdev_init(struct drm_device *dev, unsigned int
> > > preferred_bpp,
> > > + unsigned int max_conn_count);
> > > +void drm_fb_cma_fbdev_fini(struct drm_device *dev);
> > > +
> > > struct drm_fbdev_cma *drm_fbdev_cma_init_with_funcs(struct
> > > drm_device *dev,
> > > unsigned int preferred_bpp, unsigned int max_conn_count,
> > > const struct drm_framebuffer_funcs *funcs);
> >
> > _______________________________________________
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> > 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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