[PATCH 10/11] drm/amdgpu: add support for new GFX shadow size query

[Alex Deucher <alexander.deucher@amd.com>]

Use the new callback to fetch the data.  Return an error if
not supported.  UMDs should use this query to check whether
shadow buffers are supported and if so what size they
should be.

v2: return an error rather than a zerod structure.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 26 +++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index 9e85eedb57d8..8a6764756dcf 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -1139,6 +1139,32 @@ int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
 		kfree(caps);
 		return r;
 	}
+	case AMDGPU_INFO_CP_GFX_SHADOW_SIZE: {
+		struct amdgpu_gfx_shadow_info shadow_info;
+		struct drm_amdgpu_info_cp_gfx_shadow_size drm_shadow_size;
+		int r;
+
+		memset(&shadow_info, 0, sizeof(struct amdgpu_gfx_shadow_info));
+		if (adev->gfx.funcs->get_gfx_shadow_info) {
+			r = amdgpu_gfx_get_gfx_shadow_info(adev, &shadow_info);
+			if (r)
+				return r;
+			drm_shadow_size.shadow_size = shadow_info.shadow_size;
+			drm_shadow_size.shadow_alignment = shadow_info.shadow_alignment;
+			drm_shadow_size.csa_size = shadow_info.csa_size;
+			drm_shadow_size.csa_alignment = shadow_info.csa_alignment;
+			drm_shadow_size.gds_size = shadow_info.gds_size;
+			drm_shadow_size.gds_alignment = shadow_info.gds_alignment;
+		} else {
+			return -ENOTSUPP;
+		}
+		r = copy_to_user(out, &drm_shadow_size,
+				 min((size_t)size,
+				     sizeof(struct drm_amdgpu_info_cp_gfx_shadow_size))) ?
+			-EFAULT : 0;
+		return r;
+
+	}
 	default:
 		DRM_DEBUG_KMS("Invalid request %d\n", info->query);
 		return -EINVAL;
-- 
2.39.2