[PATCH libdrm 06/25] tegra: Add PRIME support helpers
Thierry Reding
thierry.reding at gmail.com
Fri Aug 27 13:22:46 UTC 2021
From: Thierry Reding <treding at nvidia.com>
These helpers facilitate exporting and importing buffer objects to and
from PRIME file descriptors.
Signed-off-by: Thierry Reding <treding at nvidia.com>
---
Changes in v3:
- add drm_public annotations
---
tegra/tegra-symbols.txt | 2 ++
tegra/tegra.c | 61 +++++++++++++++++++++++++++++++++++++++++
tegra/tegra.h | 4 +++
3 files changed, 67 insertions(+)
diff --git a/tegra/tegra-symbols.txt b/tegra/tegra-symbols.txt
index 630e075fa5d7..f8811bcd26f4 100644
--- a/tegra/tegra-symbols.txt
+++ b/tegra/tegra-symbols.txt
@@ -1,5 +1,7 @@
+drm_tegra_bo_export
drm_tegra_bo_get_handle
drm_tegra_bo_get_name
+drm_tegra_bo_import
drm_tegra_bo_map
drm_tegra_bo_new
drm_tegra_bo_open
diff --git a/tegra/tegra.c b/tegra/tegra.c
index 5eb8518104ef..240600c3c496 100644
--- a/tegra/tegra.c
+++ b/tegra/tegra.c
@@ -294,3 +294,64 @@ free:
free(bo);
return err;
}
+
+drm_public int drm_tegra_bo_export(struct drm_tegra_bo *bo, uint32_t flags)
+{
+ int fd, err;
+
+ flags |= DRM_CLOEXEC;
+
+ err = drmPrimeHandleToFD(bo->drm->fd, bo->handle, flags, &fd);
+ if (err < 0)
+ return err;
+
+ return fd;
+}
+
+static ssize_t fd_get_size(int fd)
+{
+ ssize_t size, offset;
+ int err;
+
+ offset = lseek(fd, 0, SEEK_CUR);
+ if (offset < 0)
+ return -errno;
+
+ size = lseek(fd, 0, SEEK_END);
+ if (size < 0)
+ return -errno;
+
+ err = lseek(fd, offset, SEEK_SET);
+ if (err < 0)
+ return -errno;
+
+ return size;
+}
+
+drm_public int
+drm_tegra_bo_import(struct drm_tegra *drm, int fd, struct drm_tegra_bo **bop)
+{
+ struct drm_tegra_bo *bo;
+ ssize_t size;
+ int err;
+
+ size = fd_get_size(fd);
+ if (size < 0)
+ return size;
+
+ bo = drm_tegra_bo_alloc(drm, 0, 0, size);
+ if (!bo)
+ return -ENOMEM;
+
+ err = drmPrimeFDToHandle(drm->fd, fd, &bo->handle);
+ if (err < 0)
+ goto free;
+
+ *bop = bo;
+
+ return 0;
+
+free:
+ free(bo);
+ return err;
+}
diff --git a/tegra/tegra.h b/tegra/tegra.h
index 333690f23118..aaaf455fbc8e 100644
--- a/tegra/tegra.h
+++ b/tegra/tegra.h
@@ -48,4 +48,8 @@ int drm_tegra_bo_get_name(struct drm_tegra_bo *bo, uint32_t *name);
int drm_tegra_bo_open(struct drm_tegra *drm, uint32_t name, uint32_t flags,
struct drm_tegra_bo **bop);
+int drm_tegra_bo_export(struct drm_tegra_bo *bo, uint32_t flags);
+int drm_tegra_bo_import(struct drm_tegra *drm, int fd,
+ struct drm_tegra_bo **bop);
+
#endif /* __DRM_TEGRA_H__ */
--
2.32.0
More information about the dri-devel
mailing list