linux-kernel - Re: [PATCH v3 1/5] drm/i915: instantiate ttm ranger manager for stolen memory

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Date:   Thu, 14 Apr 2022 15:23:26 +0200
From:   Thomas Hellström 
        <thomas.hellstrom@...ux.intel.com>
To:     Robert Beckett <bob.beckett@...labora.com>,
        dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     Matthew Auld <matthew.auld@...el.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/5] drm/i915: instantiate ttm ranger manager for
 stolen memory


On 4/12/22 21:38, Robert Beckett wrote:
> prepare for ttm based stolen region by using ttm range manager
> as the resource manager for stolen region.
>
> Signed-off-by: Robert Beckett <bob.beckett@...labora.com>

LGTM.

Reviewed-by: Thomas Hellström <thomas.hellstrom@...ux.intel.com>




> ---
>   drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c |  6 ++--
>   drivers/gpu/drm/i915/intel_region_ttm.c      | 31 +++++++++++++++-----
>   2 files changed, 27 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c
> index a10716f4e717..358f8a1a30ce 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c
> @@ -58,11 +58,13 @@ i915_ttm_region(struct ttm_device *bdev, int ttm_mem_type)
>   	struct drm_i915_private *i915 = container_of(bdev, typeof(*i915), bdev);
>   
>   	/* There's some room for optimization here... */
> -	GEM_BUG_ON(ttm_mem_type != I915_PL_SYSTEM &&
> -		   ttm_mem_type < I915_PL_LMEM0);
> +	GEM_BUG_ON(ttm_mem_type == I915_PL_GGTT);
> +
>   	if (ttm_mem_type == I915_PL_SYSTEM)
>   		return intel_memory_region_lookup(i915, INTEL_MEMORY_SYSTEM,
>   						  0);
> +	if (ttm_mem_type == I915_PL_STOLEN)
> +		return i915->mm.stolen_region;
>   
>   	return intel_memory_region_lookup(i915, INTEL_MEMORY_LOCAL,
>   					  ttm_mem_type - I915_PL_LMEM0);
> diff --git a/drivers/gpu/drm/i915/intel_region_ttm.c b/drivers/gpu/drm/i915/intel_region_ttm.c
> index 62ff77445b01..7d49ea72e33f 100644
> --- a/drivers/gpu/drm/i915/intel_region_ttm.c
> +++ b/drivers/gpu/drm/i915/intel_region_ttm.c
> @@ -49,7 +49,7 @@ void intel_region_ttm_device_fini(struct drm_i915_private *dev_priv)
>   
>   /*
>    * Map the i915 memory regions to TTM memory types. We use the
> - * driver-private types for now, reserving TTM_PL_VRAM for stolen
> + * driver-private types for now, reserving I915_PL_STOLEN for stolen
>    * memory and TTM_PL_TT for GGTT use if decided to implement this.
>    */
>   int intel_region_to_ttm_type(const struct intel_memory_region *mem)
> @@ -58,11 +58,17 @@ int intel_region_to_ttm_type(const struct intel_memory_region *mem)
>   
>   	GEM_BUG_ON(mem->type != INTEL_MEMORY_LOCAL &&
>   		   mem->type != INTEL_MEMORY_MOCK &&
> -		   mem->type != INTEL_MEMORY_SYSTEM);
> +		   mem->type != INTEL_MEMORY_SYSTEM &&
> +		   mem->type != INTEL_MEMORY_STOLEN_SYSTEM &&
> +		   mem->type != INTEL_MEMORY_STOLEN_LOCAL);
>   
>   	if (mem->type == INTEL_MEMORY_SYSTEM)
>   		return TTM_PL_SYSTEM;
>   
> +	if (mem->type == INTEL_MEMORY_STOLEN_SYSTEM ||
> +	    mem->type == INTEL_MEMORY_STOLEN_LOCAL)
> +		return I915_PL_STOLEN;
> +
>   	type = mem->instance + TTM_PL_PRIV;
>   	GEM_BUG_ON(type >= TTM_NUM_MEM_TYPES);
>   
> @@ -86,10 +92,16 @@ int intel_region_ttm_init(struct intel_memory_region *mem)
>   	int mem_type = intel_region_to_ttm_type(mem);
>   	int ret;
>   
> -	ret = i915_ttm_buddy_man_init(bdev, mem_type, false,
> -				      resource_size(&mem->region),
> -				      mem->io_size,
> -				      mem->min_page_size, PAGE_SIZE);
> +	if (mem_type == I915_PL_STOLEN) {
> +		ret = ttm_range_man_init(bdev, mem_type, false,
> +					 resource_size(&mem->region) >> PAGE_SHIFT);
> +		mem->is_range_manager = true;
> +	} else {
> +		ret = i915_ttm_buddy_man_init(bdev, mem_type, false,
> +					      resource_size(&mem->region),
> +					      mem->io_size,
> +					      mem->min_page_size, PAGE_SIZE);
> +	}
>   	if (ret)
>   		return ret;
>   
> @@ -109,6 +121,7 @@ int intel_region_ttm_init(struct intel_memory_region *mem)
>   int intel_region_ttm_fini(struct intel_memory_region *mem)
>   {
>   	struct ttm_resource_manager *man = mem->region_private;
> +	int mem_type = intel_region_to_ttm_type(mem);
>   	int ret = -EBUSY;
>   	int count;
>   
> @@ -139,8 +152,10 @@ int intel_region_ttm_fini(struct intel_memory_region *mem)
>   	if (ret || !man)
>   		return ret;
>   
> -	ret = i915_ttm_buddy_man_fini(&mem->i915->bdev,
> -				      intel_region_to_ttm_type(mem));
> +	if (mem_type == I915_PL_STOLEN)
> +		ret = ttm_range_man_fini(&mem->i915->bdev, mem_type);
> +	else
> +		ret = i915_ttm_buddy_man_fini(&mem->i915->bdev, mem_type);
>   	GEM_WARN_ON(ret);
>   	mem->region_private = NULL;
>