[Intel-gfx] [PATCH 07/19] drm/i915/fbdev: Use lmem physical addresses for fb_mmap() on discrete

[Daniel Vetter]

On Mon, Apr 12, 2021 at 10:05:14AM +0100, Matthew Auld wrote:
> From: Mohammed Khajapasha <mohammed.khajapasha at intel.com>
> 
> use local memory io BAR address for fbdev's fb_mmap() operation on
> discrete, fbdev uses the physical address of our framebuffer for its
> fb_mmap() fn.
> 
> Signed-off-by: Mohammed Khajapasha <mohammed.khajapasha at intel.com>

Sob missing (I didn't check all previous patches), but also I think we
should aim more to reuse drm fbdev helpers and retire our owns here.
Eventually, long-term, and all that.
-Daniel

> ---
>  drivers/gpu/drm/i915/display/intel_fbdev.c | 29 +++++++++++++++++-----
>  1 file changed, 23 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
> index ccd00e65a5fe..2b37959da747 100644
> --- a/drivers/gpu/drm/i915/display/intel_fbdev.c
> +++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
> @@ -41,6 +41,8 @@
>  #include <drm/drm_fb_helper.h>
>  #include <drm/drm_fourcc.h>
>  
> +#include "gem/i915_gem_lmem.h"
> +
>  #include "i915_drv.h"
>  #include "intel_display_types.h"
>  #include "intel_fbdev.h"
> @@ -178,6 +180,7 @@ static int intelfb_create(struct drm_fb_helper *helper,
>  	unsigned long flags = 0;
>  	bool prealloc = false;
>  	void __iomem *vaddr;
> +	struct drm_i915_gem_object *obj;
>  	int ret;
>  
>  	if (intel_fb &&
> @@ -232,13 +235,27 @@ static int intelfb_create(struct drm_fb_helper *helper,
>  	info->fbops = &intelfb_ops;
>  
>  	/* setup aperture base/size for vesafb takeover */
> -	info->apertures->ranges[0].base = ggtt->gmadr.start;
> -	info->apertures->ranges[0].size = ggtt->mappable_end;
> +	obj = intel_fb_obj(&intel_fb->base);
> +	if (i915_gem_object_is_lmem(obj)) {
> +		struct intel_memory_region *mem = obj->mm.region;
> +
> +		info->apertures->ranges[0].base = mem->io_start;
> +		info->apertures->ranges[0].size = mem->total;
> +
> +		/* Use fbdev's framebuffer from lmem for discrete */
> +		info->fix.smem_start =
> +			(unsigned long)(mem->io_start +
> +					i915_gem_object_get_dma_address(obj, 0));
> +		info->fix.smem_len = obj->base.size;
> +	} else {
> +		info->apertures->ranges[0].base = ggtt->gmadr.start;
> +		info->apertures->ranges[0].size = ggtt->mappable_end;
>  
> -	/* Our framebuffer is the entirety of fbdev's system memory */
> -	info->fix.smem_start =
> -		(unsigned long)(ggtt->gmadr.start + vma->node.start);
> -	info->fix.smem_len = vma->node.size;
> +		/* Our framebuffer is the entirety of fbdev's system memory */
> +		info->fix.smem_start =
> +			(unsigned long)(ggtt->gmadr.start + vma->node.start);
> +		info->fix.smem_len = vma->node.size;
> +	}
>  
>  	vaddr = i915_vma_pin_iomap(vma);
>  	if (IS_ERR(vaddr)) {
> -- 
> 2.26.3
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch