drm/amdgpu: Placement of gart and vram in sysvm aperture

If use GART for FB translation, place both vram and gart to sysvm
aperture. AGP aperture is not set up in this case because it
is not used

Signed-off-by: Oak Zeng <Oak.Zeng@amd.com>
Reviewed-by: Christian Konig <christian.koenig@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 33 insertions, 1 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
index 2a8588762c1d..2c3477627679 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
@@ -158,6 +158,39 @@ void amdgpu_gmc_vram_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc,
 			mc->vram_end, mc->real_vram_size >> 20);
 }
 
+/** amdgpu_gmc_sysvm_location - place vram and gart in sysvm aperture
+ *
+ * @adev: amdgpu device structure holding all necessary information
+ * @mc: memory controller structure holding memory information
+ *
+ * This function is only used if use GART for FB translation. In such
+ * case, we use sysvm aperture (vmid0 page tables) for both vram
+ * and gart (aka system memory) access.
+ *
+ * GPUVM (and our organization of vmid0 page tables) require sysvm
+ * aperture to be placed at a location aligned with 8 times of native
+ * page size. For example, if vm_context0_cntl.page_table_block_size
+ * is 12, then native page size is 8G (2M*2^12), sysvm should start
+ * with a 64G aligned address. For simplicity, we just put sysvm at
+ * address 0. So vram start at address 0 and gart is right after vram.
+ */
+void amdgpu_gmc_sysvm_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc)
+{
+	u64 hive_vram_start = 0;
+	u64 hive_vram_end = mc->xgmi.node_segment_size * mc->xgmi.num_physical_nodes - 1;
+	mc->vram_start = mc->xgmi.node_segment_size * mc->xgmi.physical_node_id;
+	mc->vram_end = mc->vram_start + mc->xgmi.node_segment_size - 1;
+	mc->gart_start = hive_vram_end + 1;
+	mc->gart_end = mc->gart_start + mc->gart_size - 1;
+	mc->fb_start = hive_vram_start;
+	mc->fb_end = hive_vram_end;
+	dev_info(adev->dev, "VRAM: %lluM 0x%016llX - 0x%016llX (%lluM used)\n",
+			mc->mc_vram_size >> 20, mc->vram_start,
+			mc->vram_end, mc->real_vram_size >> 20);
+	dev_info(adev->dev, "GART: %lluM 0x%016llX - 0x%016llX\n",
+			mc->gart_size >> 20, mc->gart_start, mc->gart_end);
+}
+
 /**
  * amdgpu_gmc_gart_location - try to find GART location
  *
@@ -165,7 +198,6 @@ void amdgpu_gmc_vram_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc,
  * @mc: memory controller structure holding memory information
  *
  * Function will place try to place GART before or after VRAM.
- *
  * If GART size is bigger than space left then we ajust GART size.
  * Thus function will never fails.
  */