Commit d76364fc authored by Christian König's avatar Christian König Committed by Alex Deucher
Browse files

drm/amdgpu: add amdgpu_gmc_agp_location v3 



Helper to figure out the location of the AGP BAR.

v2: fix a couple of bugs
v3: correctly add one to vram_end

Signed-off-by: default avatarChristian König <christian.koenig@amd.com>
Reviewed-by: default avatarJunwei Zhang <Jerry.Zhang@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent ad9a5b78

drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c

+43 −0
Original line number Diff line number Diff line
@@ -143,3 +143,46 @@ void amdgpu_gmc_gart_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc) 
	dev_info(adev->dev, "GART: %lluM 0x%016llX - 0x%016llX\n",

			mc->gart_size >> 20, mc->gart_start, mc->gart_end);

}



/**

 * amdgpu_gmc_agp_location - try to find AGP location

 * @adev: amdgpu device structure holding all necessary informations

 * @mc: memory controller structure holding memory informations

 *

 * Function will place try to find a place for the AGP BAR in the MC address

 * space.

 *

 * AGP BAR will be assigned the largest available hole in the address space.

 * Should be called after VRAM and GART locations are setup.

 */

void amdgpu_gmc_agp_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc)

{

	const uint64_t sixteen_gb = 1ULL << 34;

	const uint64_t sixteen_gb_mask = ~(sixteen_gb - 1);

	u64 size_af, size_bf;



	if (mc->vram_start > mc->gart_start) {

		size_bf = (mc->vram_start & sixteen_gb_mask) -

			ALIGN(mc->gart_end + 1, sixteen_gb);

		size_af = mc->mc_mask + 1 - ALIGN(mc->vram_end + 1, sixteen_gb);

	} else {

		size_bf = mc->vram_start & sixteen_gb_mask;

		size_af = (mc->gart_start & sixteen_gb_mask) -

			ALIGN(mc->vram_end + 1, sixteen_gb);

	}



	if (size_bf > size_af) {

		mc->agp_start = mc->vram_start > mc->gart_start ?

			mc->gart_end + 1 : 0;

		mc->agp_size = size_bf;

	} else {

		mc->agp_start = (mc->vram_start > mc->gart_start ?

			mc->vram_end : mc->gart_end) + 1,

		mc->agp_size = size_af;

	}



	mc->agp_start = ALIGN(mc->agp_start, sixteen_gb);

	mc->agp_end = mc->agp_start + mc->agp_size - 1;

	dev_info(adev->dev, "AGP: %lluM 0x%016llX - 0x%016llX\n",

			mc->agp_size >> 20, mc->agp_start, mc->agp_end);

}

drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h

+5 −0
Original line number Diff line number Diff line
@@ -94,6 +94,9 @@ struct amdgpu_gmc { 
	 * about vram size near mc fb location */

	u64			mc_vram_size;

	u64			visible_vram_size;

	u64			agp_size;

	u64			agp_start;

	u64			agp_end;

	u64			gart_size;

	u64			gart_start;

	u64			gart_end;
@@ -166,5 +169,7 @@ void amdgpu_gmc_vram_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc, 
			      u64 base);

void amdgpu_gmc_gart_location(struct amdgpu_device *adev,

			      struct amdgpu_gmc *mc);

void amdgpu_gmc_agp_location(struct amdgpu_device *adev,

			     struct amdgpu_gmc *mc);



#endif

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