On Mon, Jul 13, 2015 at 12:07:59PM +0530, Archit Taneja wrote:
> Some drm drivers populate their fb_ops with fb_sys_read/write fb sysfs
> ops.
>
> Create a drm_fb_helper function that wraps around these calls.
>
> This is part of an effort to prevent drm drivers from calling fbdev
> functions directly, in order to make fbdev emulation a top level drm
> option.
>
> Signed-off-by: Archit Taneja <arch...@codeaurora.org>
> ---
> drivers/gpu/drm/Kconfig | 1 +
> drivers/gpu/drm/drm_fb_helper.c | 20 ++++++++++++++++++++
> include/drm/drm_fb_helper.h | 5 +++++
> 3 files changed, 26 insertions(+)
>
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index a66ac44..b284cdc 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -37,6 +37,7 @@ config DRM_KMS_FB_HELPER
> select FB
> select FRAMEBUFFER_CONSOLE if !EXPERT
> select FRAMEBUFFER_CONSOLE_DETECT_PRIMARY if FRAMEBUFFER_CONSOLE
> + select FB_SYS_FOPS
> help
> FBDEV helpers for KMS drivers.
>
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index 742377d..795547e 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -744,6 +744,26 @@ void drm_fb_helper_unlink_fbi(struct drm_fb_helper
> *fb_helper)
> }
> EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
>
> +ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
> + size_t count, loff_t *ppos)
> +{
> + if (info)
I think this check here can never fail (if there's no fbdev you can't call
this function), I don't think we need it. Even for drivers which call this
themselves (like qxl/udl) they only call it from fbdev code.
-Daniel
> + return fb_sys_read(info, buf, count, ppos);
> +
> + return -ENODEV;
> +}
> +EXPORT_SYMBOL(drm_fb_helper_sys_read);
> +
> +ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
> + size_t count, loff_t *ppos)
> +{
> + if (info)
> + return fb_sys_write(info, buf, count, ppos);
> +
> + return -ENODEV;
> +}
> +EXPORT_SYMBOL(drm_fb_helper_sys_write);
> +
> static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
> u16 blue, u16 regno, struct fb_info *info)
> {
> diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
> index 4c90837..f74e59e 100644
> --- a/include/drm/drm_fb_helper.h
> +++ b/include/drm/drm_fb_helper.h
> @@ -147,6 +147,11 @@ void drm_fb_helper_fill_fix(struct fb_info *info,
> uint32_t pitch,
>
> void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper);
>
> +ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
> + size_t count, loff_t *ppos);
> +ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
> + size_t count, loff_t *ppos);
> +
> int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info);
>
> int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper);
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> hosted by The Linux Foundation
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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