drm/amd/amdgpu: add info about vram and gtt max allocation size

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

1 files changed, 18 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index 67b6274e25c8..09b94901faec 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -421,6 +421,24 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
                                     min((size_t)size, sizeof(vram_gtt_total)))
                                     ? -EFAULT : 0;
         }
+        case AMDGPU_INFO_VRAM_GTT_MAX: {
+                struct drm_amdgpu_info_vram_gtt_max vram_gtt_max;
+                u64 max_size;
+
+                max_size = adev->mc.real_vram_size - adev->vram_pin_size;
+                vram_gtt_max.vram_max_size = max_size * 3 / 4;
+
+                max_size = adev->mc.visible_vram_size - (adev->vram_pin_size -
+                                adev->invisible_pin_size);
+                vram_gtt_max.vram_cpu_accessible_max_size = max_size * 3 / 4;
+
+                max_size = adev->mc.gtt_size - adev->gart_pin_size;
+                vram_gtt_max.gtt_max_size = max_size * 3 / 4;
+
+                return copy_to_user(out, &vram_gtt_max,
+                                    min((size_t)size, sizeof(vram_gtt_max)))
+                                    ? -EFAULT : 0;
+        }
         case AMDGPU_INFO_READ_MMR_REG: {
                 unsigned n, alloc_size;
                 uint32_t *regs;