Hi Benjamin,
Thank you for the patch.
On Wednesday 07 Dec 2016 11:06:49 Benjamin Gaignard wrote:
> Allow generic frame-buffer to provide a default
> get_fb_unmapped_area function if specific devices need it.
>
> Usually this function is defined in architecture directories but
> define it here may limit code duplication especially for all ARM
> platforms without MMU.
I still would like to see an explanation why an architecture-specific version
is sometimes needed, and why this implementation is a reasonable default.
Furthermore, it looks very similar to the blackfin implementation, so if you
can't unify the two I'd like to know why.
> version 4:
> - introdude a configuration flag to be independent of architecture
>
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@xxxxxxxxxx>
> ---
> drivers/video/fbdev/Kconfig | 8 ++++++++
> drivers/video/fbdev/core/fbmem.c | 15 +++++++++++++++
> 2 files changed, 23 insertions(+)
>
> diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
> index 5d3b0db..922e4ea 100644
> --- a/drivers/video/fbdev/Kconfig
> +++ b/drivers/video/fbdev/Kconfig
> @@ -138,6 +138,14 @@ config FB_SYS_IMAGEBLIT
> blitting. This is used by drivers that don't provide their own
> (accelerated) version and the framebuffer is in system RAM.
>
> +config FB_PROVIDE_GET_FB_UNMAPPED_AREA
> + bool
> + depends on FB
> + default n
> + ---help---
> + Allow generic frame-buffer to provide get_fb_unmapped_area
> + function.
> +
> menuconfig FB_FOREIGN_ENDIAN
> bool "Framebuffer foreign endianness support"
> depends on FB
> diff --git a/drivers/video/fbdev/core/fbmem.c
> b/drivers/video/fbdev/core/fbmem.c index 76c1ad9..22321a2 100644
> --- a/drivers/video/fbdev/core/fbmem.c
> +++ b/drivers/video/fbdev/core/fbmem.c
> @@ -1492,6 +1492,21 @@ static long fb_compat_ioctl(struct file *file,
> unsigned int cmd, return 0;
> }
>
> +#ifdef CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA
> +unsigned long get_fb_unmapped_area(struct file *filp,
> + unsigned long addr, unsigned long len,
> + unsigned long pgoff, unsigned long flags)
> +{
> + struct fb_info * const info = filp->private_data;
> + unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);
> +
> + if (pgoff > fb_size || len > fb_size - pgoff)
> + return -EINVAL;
> +
> + return (unsigned long)info->screen_base + pgoff;
> +}
> +#endif
> +
> static const struct file_operations fb_fops = {
> .owner = THIS_MODULE,
> .read = fb_read,
--
Regards,
Laurent Pinchart
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