No, you can just check if it fails or not (i.e., the ioctl will return
-EINVAL if the query is not supported).
Alex
On Fri, Oct 7, 2016 at 2:33 PM, StDenis, Tom <Tom.StDenis at amd.com> wrote:
> Shouldn't there be a version bump if you're adding a new command to the
> ioctl?
>
>
> Tom
>
>
> ------------------------------
> *From:* amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Alex
> Deucher <alexdeucher at gmail.com>
> *Sent:* Friday, October 7, 2016 14:28
> *To:* amd-gfx at lists.freedesktop.org; Fang, Peter; Zhang, Boyuan
> *Cc:* Deucher, Alexander
> *Subject:* [PATCH 2/6] drm/amdgpu: add info ioctl query for vce clock info
>
> This is needed to set up the vce clock table in userspace
> for proper VCE DPM.
>
> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
> ---
> include/uapi/drm/amdgpu_drm.h | 18 ++++++++++++++++++
> 1 file changed, 18 insertions(+)
>
> diff --git a/include/uapi/drm/amdgpu_drm.h b/include/uapi/drm/amdgpu_drm.h
> index b6a04d4..7cb71f8 100644
> --- a/include/uapi/drm/amdgpu_drm.h
> +++ b/include/uapi/drm/amdgpu_drm.h
> @@ -491,6 +491,8 @@ struct drm_amdgpu_cs_chunk_data {
> #define AMDGPU_INFO_NUM_EVICTIONS 0x18
> /* Query memory about VRAM and GTT domains */
> #define AMDGPU_INFO_MEMORY 0x19
> +/* Query memory about VRAM and GTT domains */
> +#define AMDGPU_INFO_VCE_CLOCK_TABLE 0x1A
>
> #define AMDGPU_INFO_MMR_SE_INDEX_SHIFT 0
> #define AMDGPU_INFO_MMR_SE_INDEX_MASK 0xff
> @@ -677,6 +679,22 @@ struct drm_amdgpu_info_hw_ip {
> __u32 _pad;
> };
>
> +#define AMDGPU_VCE_CLOCK_TABLE_ENTRIES 6
> +
> +struct drm_amdgpu_info_vce_clock_table_entry {
> + /** System clock */
> + __u32 sclk;
> + /** Memory clock */
> + __u32 mclk;
> + /** VCE clock */
> + __u32 eclk;
> + __u32 pad;
> +};
> +
> +struct drm_amdgpu_info_vce_clock_table {
> + struct drm_amdgpu_info_vce_clock_table_entry
> entries[AMDGPU_VCE_CLOCK_TABLE_ENTRIES];
> +};
> +
> /*
> * Supported GPU families
> */
> --
> 2.5.5
>
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