drm/amd/amdgpu: get maximum and used UVD handles (v4)

Change History
--------------

v4: Changes suggested by Emil, Christian
- return -ENODATA for asics with unlimited sessions

v3: changes suggested by Christian
- Add a check for UVD IP block using AMDGPU_HW_IP_UVD
  query type.
- Add a check for asic_type to be less than
  CHIP_POLARIS10 since starting Polaris, we support
  unlimited UVD instances.
- Add kerneldoc style comment for
  amdgpu_uvd_used_handles().

v2: as suggested by Christian
- Add a new query AMDGPU_INFO_NUM_HANDLES
- Create a helper function to return the number
  of currently used UVD handles.
- Modify the logic to count the number of used
  UVD handles since handles can be freed in
  non-linear fashion.

v1:
- User might want to query the maximum number of UVD
  instances supported by firmware. In addition to that,
  if there are multiple applications using UVD handles
  at the same time, he might also want to query the
  currently used number of handles.

  For this we add two variables max_handles and
  used_handles inside drm_amdgpu_info_hw_ip. So now
  an application (or libdrm) can use AMDGPU_INFO IOCTL
  with AMDGPU_INFO_HW_IP_INFO query type to get these
  values.

Signed-off-by: Arindam Nath <arindam.nath@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/uapi/drm/amdgpu_drm.h b/include/uapi/drm/amdgpu_drm.h
index 396183628f3c..5797283c2d79 100644
--- a/include/uapi/drm/amdgpu_drm.h
+++ b/include/uapi/drm/amdgpu_drm.h
@@ -528,6 +528,8 @@ struct drm_amdgpu_cs_chunk_data {
 	#define AMDGPU_INFO_VBIOS_SIZE		0x1
 	/* Subquery id: Query vbios image */
 	#define AMDGPU_INFO_VBIOS_IMAGE		0x2
+/* Query UVD handles */
+#define AMDGPU_INFO_NUM_HANDLES			0x1C
 
 #define AMDGPU_INFO_MMR_SE_INDEX_SHIFT	0
 #define AMDGPU_INFO_MMR_SE_INDEX_MASK	0xff
@@ -719,6 +721,13 @@ struct drm_amdgpu_info_hw_ip {
 	__u32  _pad;
 };
 
+struct drm_amdgpu_info_num_handles {
+	/** Max handles as supported by firmware for UVD */
+	__u32  uvd_max_handles;
+	/** Handles currently in use for UVD */
+	__u32  uvd_used_handles;
+};
+
 #define AMDGPU_VCE_CLOCK_TABLE_ENTRIES		6
 
 struct drm_amdgpu_info_vce_clock_table_entry {