[PATCH] drm/ttm: ioremap buffer according to TTM mem caching setting
Bhardwaj, Rajneesh
rajneesh.bhardwaj at amd.com
Thu Mar 4 17:01:55 UTC 2021
I was wondering if a managed version of such API exists but looks like
none. We only have devm_ioremap_wc but that is valid only for
PAGE_CACHE_MODE_WC whereas ioremap_cache uses _WB. One more small
comment below.
Acked-by: Rajneesh Bhardwaj <rajneesh.bhardwaj at amd.com>
On 3/4/2021 11:04 AM, Oak Zeng wrote:
> If tbo.mem.bus.caching is cached, buffer is intended to be mapped
> as cached from CPU. Map it with ioremap_cache.
>
> This wasn't necessary before as device memory was never mapped
> as cached from CPU side. It becomes necessary for aldebaran as
> device memory is mapped cached from CPU.
>
> Signed-off-by: Oak Zeng <Oak.Zeng at amd.com>
> Reviewed-by: Christian Konig <Christian.Koenig at amd.com>
> ---
> drivers/gpu/drm/ttm/ttm_bo_util.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
> index 031e581..7429464 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo_util.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
> @@ -91,6 +91,10 @@ static int ttm_resource_ioremap(struct ttm_device *bdev,
>
> if (mem->bus.caching == ttm_write_combined)
> addr = ioremap_wc(mem->bus.offset, bus_size);
> +#ifdef CONFIG_X86
Please use #if defined (CONFIG_X86)
> + else if (mem->bus.caching == ttm_cached)
> + addr = ioremap_cache(mem->bus.offset, bus_size);
> +#endif
> else
> addr = ioremap(mem->bus.offset, bus_size);
> if (!addr) {
> @@ -372,6 +376,11 @@ static int ttm_bo_ioremap(struct ttm_buffer_object *bo,
> if (mem->bus.caching == ttm_write_combined)
> map->virtual = ioremap_wc(bo->mem.bus.offset + offset,
> size);
> +#ifdef CONFIG_X86
> + else if (mem->bus.caching == ttm_cached)
> + map->virtual = ioremap_cache(bo->mem.bus.offset + offset,
> + size);
> +#endif
> else
> map->virtual = ioremap(bo->mem.bus.offset + offset,
> size);
> @@ -490,6 +499,11 @@ int ttm_bo_vmap(struct ttm_buffer_object *bo, struct dma_buf_map *map)
> else if (mem->bus.caching == ttm_write_combined)
> vaddr_iomem = ioremap_wc(mem->bus.offset,
> bo->base.size);
> + else if (mem->bus.caching == ttm_cached)
> +#ifdef CONFIG_X86
> + vaddr_iomem = ioremap_cache(mem->bus.offset,
> + bo->base.size);
> +#endif
> else
> vaddr_iomem = ioremap(mem->bus.offset, bo->base.size);
>
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