drm/amdgpu: enable AGP aperture on gmc10.x (v2)

Just a small optimization for accessing system pages directly.
Was missed for gmc v10 since the feature landed for older gmcs
while we were still on the emulator or gmc10 and we use the AGP
aperture for zfb on the emulator.

v2: fix up the system aperture as well

Reviewed-and-tested-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

5 files changed, 20 insertions, 19 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/gfxhub_v2_0.c b/drivers/gpu/drm/amd/amdgpu/gfxhub_v2_0.c
index 456360bf58fa..2aecc6a243e8 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfxhub_v2_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfxhub_v2_0.c
@@ -153,16 +153,16 @@ static void gfxhub_v2_0_init_system_aperture_regs(struct amdgpu_device *adev)
 	uint64_t value;
 
 	if (!amdgpu_sriov_vf(adev)) {
-		/* Disable AGP. */
+		/* Program the AGP BAR */
 		WREG32_SOC15(GC, 0, mmGCMC_VM_AGP_BASE, 0);
-		WREG32_SOC15(GC, 0, mmGCMC_VM_AGP_TOP, 0);
-		WREG32_SOC15(GC, 0, mmGCMC_VM_AGP_BOT, 0x00FFFFFF);
+		WREG32_SOC15(GC, 0, mmGCMC_VM_AGP_BOT, adev->gmc.agp_start >> 24);
+		WREG32_SOC15(GC, 0, mmGCMC_VM_AGP_TOP, adev->gmc.agp_end >> 24);
 
 		/* Program the system aperture low logical page number. */
 		WREG32_SOC15(GC, 0, mmGCMC_VM_SYSTEM_APERTURE_LOW_ADDR,
-			     adev->gmc.vram_start >> 18);
+			     min(adev->gmc.fb_start, adev->gmc.agp_start) >> 18);
 		WREG32_SOC15(GC, 0, mmGCMC_VM_SYSTEM_APERTURE_HIGH_ADDR,
-			     adev->gmc.vram_end >> 18);
+			     max(adev->gmc.fb_end, adev->gmc.agp_end) >> 18);
 
 		/* Set default page address. */
 		value = adev->vram_scratch.gpu_addr - adev->gmc.vram_start
diff --git a/drivers/gpu/drm/amd/amdgpu/gfxhub_v2_1.c b/drivers/gpu/drm/amd/amdgpu/gfxhub_v2_1.c
index 724bb29e9bb4..410fd3a1a388 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfxhub_v2_1.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfxhub_v2_1.c
@@ -152,16 +152,16 @@ static void gfxhub_v2_1_init_system_aperture_regs(struct amdgpu_device *adev)
 {
 	uint64_t value;
 
-	/* Disable AGP. */
+	/* Program the AGP BAR */
 	WREG32_SOC15(GC, 0, mmGCMC_VM_AGP_BASE, 0);
-	WREG32_SOC15(GC, 0, mmGCMC_VM_AGP_TOP, 0);
-	WREG32_SOC15(GC, 0, mmGCMC_VM_AGP_BOT, 0x00FFFFFF);
+	WREG32_SOC15(GC, 0, mmGCMC_VM_AGP_BOT, adev->gmc.agp_start >> 24);
+	WREG32_SOC15(GC, 0, mmGCMC_VM_AGP_TOP, adev->gmc.agp_end >> 24);
 
 	/* Program the system aperture low logical page number. */
 	WREG32_SOC15(GC, 0, mmGCMC_VM_SYSTEM_APERTURE_LOW_ADDR,
-		     adev->gmc.vram_start >> 18);
+		     min(adev->gmc.fb_start, adev->gmc.agp_start) >> 18);
 	WREG32_SOC15(GC, 0, mmGCMC_VM_SYSTEM_APERTURE_HIGH_ADDR,
-		     adev->gmc.vram_end >> 18);
+		     max(adev->gmc.fb_end, adev->gmc.agp_end) >> 18);
 
 	/* Set default page address. */
 	value = adev->vram_scratch.gpu_addr - adev->gmc.vram_start
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
index 4f6e44e21691..518233d71e6d 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
@@ -738,6 +738,7 @@ static void gmc_v10_0_vram_gtt_location(struct amdgpu_device *adev,
 
 	amdgpu_gmc_vram_location(adev, &adev->gmc, base);
 	amdgpu_gmc_gart_location(adev, mc);
+	amdgpu_gmc_agp_location(adev, mc);
 
 	/* base offset of vram pages */
 	adev->vm_manager.vram_base_offset = adev->gfxhub.funcs->get_mc_fb_offset(adev);
diff --git a/drivers/gpu/drm/amd/amdgpu/mmhub_v2_0.c b/drivers/gpu/drm/amd/amdgpu/mmhub_v2_0.c
index 4ac8ac0c56c8..57d5f8ffb764 100644
--- a/drivers/gpu/drm/amd/amdgpu/mmhub_v2_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/mmhub_v2_0.c
@@ -195,17 +195,17 @@ static void mmhub_v2_0_init_system_aperture_regs(struct amdgpu_device *adev)
 	uint64_t value;
 	uint32_t tmp;
 
-	/* Disable AGP. */
+	/* Program the AGP BAR */
 	WREG32_SOC15(MMHUB, 0, mmMMMC_VM_AGP_BASE, 0);
-	WREG32_SOC15(MMHUB, 0, mmMMMC_VM_AGP_TOP, 0);
-	WREG32_SOC15(MMHUB, 0, mmMMMC_VM_AGP_BOT, 0x00FFFFFF);
+	WREG32_SOC15(MMHUB, 0, mmMMMC_VM_AGP_BOT, adev->gmc.agp_start >> 24);
+	WREG32_SOC15(MMHUB, 0, mmMMMC_VM_AGP_TOP, adev->gmc.agp_end >> 24);
 
 	if (!amdgpu_sriov_vf(adev)) {
 		/* Program the system aperture low logical page number. */
 		WREG32_SOC15(MMHUB, 0, mmMMMC_VM_SYSTEM_APERTURE_LOW_ADDR,
-			     adev->gmc.vram_start >> 18);
+			     min(adev->gmc.fb_start, adev->gmc.agp_start) >> 18);
 		WREG32_SOC15(MMHUB, 0, mmMMMC_VM_SYSTEM_APERTURE_HIGH_ADDR,
-			     adev->gmc.vram_end >> 18);
+			     max(adev->gmc.fb_end, adev->gmc.agp_end) >> 18);
 	}
 
 	/* Set default page address. */
diff --git a/drivers/gpu/drm/amd/amdgpu/mmhub_v2_3.c b/drivers/gpu/drm/amd/amdgpu/mmhub_v2_3.c
index 3a248c8cd0b9..fa77eae6cf47 100644
--- a/drivers/gpu/drm/amd/amdgpu/mmhub_v2_3.c
+++ b/drivers/gpu/drm/amd/amdgpu/mmhub_v2_3.c
@@ -152,14 +152,14 @@ static void mmhub_v2_3_init_system_aperture_regs(struct amdgpu_device *adev)
 
 	/* Disable AGP. */
 	WREG32_SOC15(MMHUB, 0, mmMMMC_VM_AGP_BASE, 0);
-	WREG32_SOC15(MMHUB, 0, mmMMMC_VM_AGP_TOP, 0);
-	WREG32_SOC15(MMHUB, 0, mmMMMC_VM_AGP_BOT, 0x00FFFFFF);
+	WREG32_SOC15(MMHUB, 0, mmMMMC_VM_AGP_BOT, adev->gmc.agp_start >> 24);
+	WREG32_SOC15(MMHUB, 0, mmMMMC_VM_AGP_TOP, adev->gmc.agp_end >> 24);
 
 	/* Program the system aperture low logical page number. */
 	WREG32_SOC15(MMHUB, 0, mmMMMC_VM_SYSTEM_APERTURE_LOW_ADDR,
-		     adev->gmc.vram_start >> 18);
+		     min(adev->gmc.fb_start, adev->gmc.agp_start) >> 18);
 	WREG32_SOC15(MMHUB, 0, mmMMMC_VM_SYSTEM_APERTURE_HIGH_ADDR,
-		     adev->gmc.vram_end >> 18);
+		     max(adev->gmc.fb_end, adev->gmc.agp_end) >> 18);
 
 	/* Set default page address. */
 	value = adev->vram_scratch.gpu_addr - adev->gmc.vram_start +