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drm/nouveau: exec: report max pushs through getparam

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Report the maximum number of IBs that can be pushed with a single
DRM_IOCTL_NOUVEAU_EXEC through DRM_IOCTL_NOUVEAU_GETPARAM.

While the maximum number of IBs per ring might vary between chipsets,
the kernel will make sure that userspace can only push a fraction of the
maximum number of IBs per ring per job, such that we avoid a situation
where there's only a single job occupying the ring, which could
potentially lead to the ring run dry.

Using DRM_IOCTL_NOUVEAU_GETPARAM to report the maximum number of IBs
that can be pushed with a single DRM_IOCTL_NOUVEAU_EXEC implies that
all channels of a given device have the same ring size.

Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Signed-off-by: Danilo Krummrich <dakr@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231002135008.10651-3-dakr@redhat.com
This commit is contained in:
Danilo Krummrich
2023-10-02 15:46:48 +02:00
parent bbe08a0e11
commit d59e75eef5
6 changed files with 49 additions and 4 deletions
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10
include/uapi/drm/nouveau_drm.h
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@@ -44,6 +44,16 @@ extern "C" {
#define NOUVEAU_GETPARAM_PTIMER_TIME 14
#define NOUVEAU_GETPARAM_HAS_BO_USAGE 15
#define NOUVEAU_GETPARAM_HAS_PAGEFLIP 16
/**
* @NOUVEAU_GETPARAM_EXEC_PUSH_MAX
*
* Query the maximum amount of IBs that can be pushed through a single
* &drm_nouveau_exec structure and hence a single &DRM_IOCTL_NOUVEAU_EXEC
* ioctl().
*/
#define NOUVEAU_GETPARAM_EXEC_PUSH_MAX 17
struct drm_nouveau_getparam {
__u64 param;
__u64 value;