drm/amdgpu: remove VRAM size reduction v2

Remove some outdated comments and all code which tries to reduce the VRAM size
mapped into the MC.

This is superfluous and misleading since we never actually program the size.

v2: handle gmc_v6_0.c as well

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -578,41 +578,13 @@ void amdgpu_wb_free(struct amdgpu_device *adev, u32 wb)
  * @base: base address at which to put VRAM
  *
  * Function will try to place VRAM at base address provided
- * as parameter (which is so far either PCI aperture address or
- * for IGP TOM base address).
- *
- * If there is not enough space to fit the unvisible VRAM in the 32bits
- * address space then we limit the VRAM size to the aperture.
- *
- * Note: We don't explicitly enforce VRAM start to be aligned on VRAM size,
- * this shouldn't be a problem as we are using the PCI aperture as a reference.
- * Otherwise this would be needed for rv280, all r3xx, and all r4xx, but
- * not IGP.
- *
- * Note: we use mc_vram_size as on some board we need to program the mc to
- * cover the whole aperture even if VRAM size is inferior to aperture size
- * Novell bug 204882 + along with lots of ubuntu ones
- *
- * Note: when limiting vram it's safe to overwritte real_vram_size because
- * we are not in case where real_vram_size is inferior to mc_vram_size (ie
- * note afected by bogus hw of Novell bug 204882 + along with lots of ubuntu
- * ones)
- *
- * Note: IGP TOM addr should be the same as the aperture addr, we don't
- * explicitly check for that though.
- *
- * FIXME: when reducing VRAM size align new size on power of 2.
+ * as parameter.
  */
 void amdgpu_vram_location(struct amdgpu_device *adev, struct amdgpu_mc *mc, u64 base)
 {
 	uint64_t limit = (uint64_t)amdgpu_vram_limit << 20;
 
 	mc->vram_start = base;
-	if (mc->mc_vram_size > (adev->mc.mc_mask - base + 1)) {
-		dev_warn(adev->dev, "limiting VRAM to PCI aperture size\n");
-		mc->real_vram_size = mc->aper_size;
-		mc->mc_vram_size = mc->aper_size;
-	}
 	mc->vram_end = mc->vram_start + mc->mc_vram_size - 1;
 	if (limit && limit < mc->real_vram_size)
 		mc->real_vram_size = limit;

drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c

@@ -222,11 +222,6 @@ static void gmc_v6_0_vram_gtt_location(struct amdgpu_device *adev,
 	u64 base = RREG32(mmMC_VM_FB_LOCATION) & 0xFFFF;
 	base <<= 24;
 
-	if (mc->mc_vram_size > 0xFFC0000000ULL) {
-		dev_warn(adev->dev, "limiting VRAM\n");
-		mc->real_vram_size = 0xFFC0000000ULL;
-		mc->mc_vram_size = 0xFFC0000000ULL;
-	}
 	amdgpu_vram_location(adev, &adev->mc, base);
 	amdgpu_gart_location(adev, mc);
 }

drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c

@@ -240,12 +240,6 @@ static void gmc_v7_0_vram_gtt_location(struct amdgpu_device *adev,
 	u64 base = RREG32(mmMC_VM_FB_LOCATION) & 0xFFFF;
 	base <<= 24;
 
-	if (mc->mc_vram_size > 0xFFC0000000ULL) {
-		/* leave room for at least 1024M GTT */
-		dev_warn(adev->dev, "limiting VRAM\n");
-		mc->real_vram_size = 0xFFC0000000ULL;
-		mc->mc_vram_size = 0xFFC0000000ULL;
-	}
 	amdgpu_vram_location(adev, &adev->mc, base);
 	amdgpu_gart_location(adev, mc);
 }

drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c

@@ -405,12 +405,6 @@ static void gmc_v8_0_vram_gtt_location(struct amdgpu_device *adev,
 		base = RREG32(mmMC_VM_FB_LOCATION) & 0xFFFF;
 	base <<= 24;
 
-	if (mc->mc_vram_size > 0xFFC0000000ULL) {
-		/* leave room for at least 1024M GTT */
-		dev_warn(adev->dev, "limiting VRAM\n");
-		mc->real_vram_size = 0xFFC0000000ULL;
-		mc->mc_vram_size = 0xFFC0000000ULL;
-	}
 	amdgpu_vram_location(adev, &adev->mc, base);
 	amdgpu_gart_location(adev, mc);
 }