drm/amdgpu: add new AMDGPU_INFO subquery for userq objects

This patch adds a new subquery (AMDGPU_INFO_UQ_FW_AREAS) in
AMDGPU_INFO_IOCTL to get the size and alignment of shadow
and csa objects from the FW setup. This information is
required for the userqueue consumers.

V2: Added Alex's suggestions and addressed review comments:
- make this query IP specific (GFX/SDMA etc)
- give a better title (AMDGPU_INFO_UQ_METADATA)
- restructured the code as per sample code shared by Alex

V3: Split the UAPI patch from shadow_size_fn modifications
V4: Addressed review comments from UAPI review (Marek/Pierre-Eric)
    - Change the query name to AMDGPU_INFO_UQ_FW_AREAS
    - remove unused inpur parameter for AMDGPU_HW_IP*

UAPI link: https://gitlab.freedesktop.org/mesa/drm/-/merge_requests/400/

Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian Koenig <christian.koenig@amd.com>
Cc: Arvind Yadav <arvind.yadav@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Shashank Sharma <shashank.sharma@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

2 files changed, 76 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index 1fcf0ef06315..2e07776dd408 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -371,6 +371,26 @@ static int amdgpu_firmware_info(struct drm_amdgpu_info_firmware *fw_info,
 	return 0;
 }
 
+static int amdgpu_userq_metadata_info_gfx(struct amdgpu_device *adev,
+					  struct drm_amdgpu_info *info,
+					  struct drm_amdgpu_info_uq_metadata_gfx *meta)
+{
+	int ret = -EOPNOTSUPP;
+
+	if (adev->gfx.funcs->get_gfx_shadow_info) {
+		struct amdgpu_gfx_shadow_info shadow = {};
+
+		adev->gfx.funcs->get_gfx_shadow_info(adev, &shadow, true);
+		meta->shadow_size = shadow.shadow_size;
+		meta->shadow_alignment = shadow.shadow_alignment;
+		meta->csa_size = shadow.csa_size;
+		meta->csa_alignment = shadow.csa_alignment;
+		ret = 0;
+	}
+
+	return ret;
+}
+
 static int amdgpu_hw_ip_info(struct amdgpu_device *adev,
 			     struct drm_amdgpu_info *info,
 			     struct drm_amdgpu_info_hw_ip *result)
@@ -1294,6 +1314,22 @@ out:
 		return copy_to_user(out, &gpuvm_fault,
 				    min((size_t)size, sizeof(gpuvm_fault))) ? -EFAULT : 0;
 	}
+	case AMDGPU_INFO_UQ_FW_AREAS: {
+		struct drm_amdgpu_info_uq_metadata meta_info = {};
+
+		switch (info->query_hw_ip.type) {
+		case AMDGPU_HW_IP_GFX:
+			ret = amdgpu_userq_metadata_info_gfx(adev, info, &meta_info.gfx);
+			if (ret)
+				return ret;
+
+			ret = copy_to_user(out, &meta_info,
+						min((size_t)size, sizeof(meta_info))) ? -EFAULT : 0;
+			return 0;
+		default:
+			return -EINVAL;
+		}
+	}
 	default:
 		DRM_DEBUG_KMS("Invalid request %d\n", info->query);
 		return -EINVAL;
diff --git a/include/uapi/drm/amdgpu_drm.h b/include/uapi/drm/amdgpu_drm.h
index 72dc16dbca7f..5dbd9037afe7 100644
--- a/include/uapi/drm/amdgpu_drm.h
+++ b/include/uapi/drm/amdgpu_drm.h
@@ -1193,6 +1193,8 @@ struct drm_amdgpu_cs_chunk_cp_gfx_shadow {
 #define AMDGPU_INFO_MAX_IBS			0x22
 /* query last page fault info */
 #define AMDGPU_INFO_GPUVM_FAULT			0x23
+/* query FW object size and alignment */
+#define AMDGPU_INFO_UQ_FW_AREAS			0x24
 
 #define AMDGPU_INFO_MMR_SE_INDEX_SHIFT	0
 #define AMDGPU_INFO_MMR_SE_INDEX_MASK	0xff
@@ -1469,6 +1471,27 @@ struct drm_amdgpu_info_hw_ip {
 	__u32  ip_discovery_version;
 };
 
+/* GFX metadata BO sizes and alignment info (in bytes) */
+struct drm_amdgpu_info_uq_fw_areas_gfx {
+	/* shadow area size */
+	__u32 shadow_size;
+	/* shadow area base virtual mem alignment */
+	__u32 shadow_alignment;
+	/* context save area size */
+	__u32 csa_size;
+	/* context save area base virtual mem alignment */
+	__u32 csa_alignment;
+};
+
+/* IP specific fw related information used in the
+ * subquery AMDGPU_INFO_UQ_FW_AREAS
+ */
+struct drm_amdgpu_info_uq_fw_areas {
+	union {
+		struct drm_amdgpu_info_uq_fw_areas_gfx gfx;
+	};
+};
+
 struct drm_amdgpu_info_num_handles {
 	/** Max handles as supported by firmware for UVD */
 	__u32  uvd_max_handles;
@@ -1532,6 +1555,23 @@ struct drm_amdgpu_info_gpuvm_fault {
 	__u32 vmhub;
 };
 
+struct drm_amdgpu_info_uq_metadata_gfx {
+	/* shadow area size for gfx11 */
+	__u32 shadow_size;
+	/* shadow area base virtual alignment for gfx11 */
+	__u32 shadow_alignment;
+	/* context save area size for gfx11 */
+	__u32 csa_size;
+	/* context save area base virtual alignment for gfx11 */
+	__u32 csa_alignment;
+};
+
+struct drm_amdgpu_info_uq_metadata {
+	union {
+		struct drm_amdgpu_info_uq_metadata_gfx gfx;
+	};
+};
+
 /*
  * Supported GPU families
  */