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drm/tegra: Add syncpoint memory export interface

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Add a userspace interface for providing access to the memory syncpoint
shim through dma-buf file descriptors. Applications can pass references
to syncpoints to other devices that only support memory semaphores to
facilitate synchronization with syncpoints.

Only syncpoints allocated through the DRM file descriptor ("owned" by
the application) can be exported read-write. All syncpoints can be
exported read-only.

Jira HOSTX-5722
Bug 4919132

Change-Id: I4f5c007b7f9ba65780c418b4e22c5f59a11ef84d
Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3252026
Reviewed-by: Santosh BS <santoshb@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Mikko Perttunen
2024-11-19 07:07:34 +00:00
committed by Jon Hunter
parent af2a177038
commit 5f7d8f89c6
4 changed files with 230 additions and 0 deletions
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2
drivers/gpu/drm/tegra/uapi.h
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@@ -51,6 +51,8 @@ int tegra_drm_ioctl_syncpoint_free(struct drm_device *drm, void *data,
struct drm_file *file);
int tegra_drm_ioctl_syncpoint_wait(struct drm_device *drm, void *data,
struct drm_file *file);
int tegra_drm_ioctl_syncpoint_export_memory(struct drm_device *drm, void *data,
struct drm_file *file);
void tegra_drm_uapi_close_file(struct tegra_drm_file *file);
void tegra_drm_mapping_put(struct tegra_drm_mapping *mapping);