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| author | Danilo Krummrich <dakr@redhat.com> | 2023-10-02 15:46:48 +0200 |
|---|---|---|
| committer | Danilo Krummrich <dakr@redhat.com> | 2023-10-04 00:10:18 +0200 |
| commit | d59e75eef52d89201aaf5342a3ac23ddf3e9b112 (patch) | |
| tree | 1afbf0272f482863b77a80163c1cc628ab6d7365 /drivers/gpu/drm/nouveau/nouveau_dma.h | |
| parent | bbe08a0e11ae76fc466c11b9fa6dd6eb52544a46 (diff) | |
| download | lwn-d59e75eef52d89201aaf5342a3ac23ddf3e9b112.tar.gz lwn-d59e75eef52d89201aaf5342a3ac23ddf3e9b112.zip | |
drm/nouveau: exec: report max pushs through getparam
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
Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_dma.h')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_dma.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_dma.h b/drivers/gpu/drm/nouveau/nouveau_dma.h index 1744d95b233e..c52cda82353e 100644 --- a/drivers/gpu/drm/nouveau/nouveau_dma.h +++ b/drivers/gpu/drm/nouveau/nouveau_dma.h @@ -49,6 +49,9 @@ void nv50_dma_push(struct nouveau_channel *, u64 addr, u32 length, /* Maximum push buffer size. */ #define NV50_DMA_PUSH_MAX_LENGTH 0x7fffff +/* Maximum IBs per ring. */ +#define NV50_DMA_IB_MAX ((0x02000 / 8) - 1) + /* Object handles - for stuff that's doesn't use handle == oclass. */ enum { NvDmaFB = 0x80000002, |