[PATCH v3 09/12] drm/xe: Abstract read/write functions for GGTT PTEs

[Matthew Brost]

On Thu, Oct 03, 2024 at 05:44:18PM +0200, Maarten Lankhorst wrote:
> Instead of writing directly, use GGTT functions. This allows us to
> hide away more GGTT details.
> 
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>

Reviewed-by: Matthew Brost <matthew.brost at intel.com>

> ---
>  drivers/gpu/drm/xe/display/xe_fb_pin.c        |  4 +--
>  drivers/gpu/drm/xe/display/xe_plane_initial.c |  6 +----
>  drivers/gpu/drm/xe/xe_ggtt.c                  | 25 +++++++++++++++++++
>  drivers/gpu/drm/xe/xe_ggtt.h                  |  3 +++
>  4 files changed, 31 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/xe/display/xe_fb_pin.c b/drivers/gpu/drm/xe/display/xe_fb_pin.c
> index 79dbbbe03c7f6..bddd526b33297 100644
> --- a/drivers/gpu/drm/xe/display/xe_fb_pin.c
> +++ b/drivers/gpu/drm/xe/display/xe_fb_pin.c
> @@ -172,7 +172,7 @@ write_ggtt_rotated(struct xe_bo *bo, struct xe_ggtt *ggtt, u32 *ggtt_ofs, u32 bo
>  			u64 pte = ggtt->pt_ops->pte_encode_bo(bo, src_idx * XE_PAGE_SIZE,
>  							      xe->pat.idx[XE_CACHE_NONE]);
>  
> -			ggtt->pt_ops->ggtt_set_pte(ggtt, *ggtt_ofs, pte);
> +			xe_ggtt_write_pte(ggtt, *ggtt_ofs, pte);
>  			*ggtt_ofs += XE_PAGE_SIZE;
>  			src_idx -= src_stride;
>  		}
> @@ -226,7 +226,7 @@ static int __xe_pin_fb_vma_ggtt(const struct intel_framebuffer *fb,
>  			u64 pte = ggtt->pt_ops->pte_encode_bo(bo, x,
>  							      xe->pat.idx[XE_CACHE_NONE]);
>  
> -			ggtt->pt_ops->ggtt_set_pte(ggtt, vma->node->base.start + x, pte);
> +			xe_ggtt_write_pte(ggtt, vma->node->base.start + x, pte);
>  		}
>  	} else {
>  		u32 i, ggtt_ofs;
> diff --git a/drivers/gpu/drm/xe/display/xe_plane_initial.c b/drivers/gpu/drm/xe/display/xe_plane_initial.c
> index ddbd964dc20f5..7cbe7fcf8b600 100644
> --- a/drivers/gpu/drm/xe/display/xe_plane_initial.c
> +++ b/drivers/gpu/drm/xe/display/xe_plane_initial.c
> @@ -70,12 +70,8 @@ initial_plane_bo(struct xe_device *xe,
>  
>  	base = round_down(plane_config->base, page_size);
>  	if (IS_DGFX(xe) || GRAPHICS_VERx100(xe) >= 1270) {
> -		u64 __iomem *gte = tile0->mem.ggtt->gsm;
> -		u64 pte;
> +		u64 pte = xe_ggtt_read_pte(tile0->mem.ggtt, base);
>  
> -		gte += base / XE_PAGE_SIZE;
> -
> -		pte = ioread64(gte);
>  		if (!(pte & XE_GGTT_PTE_DM)) {
>  			drm_err(&xe->drm,
>  				"Initial plane programming missing DM bit\n");
> diff --git a/drivers/gpu/drm/xe/xe_ggtt.c b/drivers/gpu/drm/xe/xe_ggtt.c
> index 4866e9b252ad9..6945fbfc555ce 100644
> --- a/drivers/gpu/drm/xe/xe_ggtt.c
> +++ b/drivers/gpu/drm/xe/xe_ggtt.c
> @@ -855,3 +855,28 @@ u64 xe_ggtt_print_holes(struct xe_ggtt *ggtt, u64 alignment, struct drm_printer
>  
>  	return total;
>  }
> +
> +/**
> + * xe_ggtt_read_pte - Read a PTE from the GGTT
> + * @ggtt: &xe_ggtt
> + * @offset: the offset for which the mapping should be read.
> + *
> + * Used by display for inheriting a bios set FB.
> + */
> +u64 xe_ggtt_read_pte(struct xe_ggtt *ggtt, u64 offset)
> +{
> +	return ioread64(ggtt->gsm + (offset / XE_PAGE_SIZE));
> +}
> +
> +/**
> + * xe_ggtt_write_pte - Write a PTE to the GGTT
> + * @ggtt: &xe_ggtt
> + * @offset: the offset for which the mapping should be written.
> + * @pte: The page table entry to write
> + *
> + * Used by display for writing normal and rotated GGTT entries for temporary pinned FB's.
> + */
> +void xe_ggtt_write_pte(struct xe_ggtt *ggtt, u64 offset, u64 pte)
> +{
> +	return ggtt->pt_ops->ggtt_set_pte(ggtt, offset, pte);
> +}
> diff --git a/drivers/gpu/drm/xe/xe_ggtt.h b/drivers/gpu/drm/xe/xe_ggtt.h
> index 0bab1fd7cc817..f83e5af0400e9 100644
> --- a/drivers/gpu/drm/xe/xe_ggtt.h
> +++ b/drivers/gpu/drm/xe/xe_ggtt.h
> @@ -47,4 +47,7 @@ static inline void xe_ggtt_might_lock(struct xe_ggtt *ggtt)
>  void xe_ggtt_might_lock(struct xe_ggtt *ggtt);
>  #endif
>  
> +u64 xe_ggtt_read_pte(struct xe_ggtt *ggtt, u64 offset);
> +void xe_ggtt_write_pte(struct xe_ggtt *ggtt, u64 offset, u64 pte);
> +
>  #endif
> -- 
> 2.45.2
>