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drm/panthor: Flush shmem writes before mapping buffers CPU-uncached (#422)

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Mecid 2026-01-16 12:40:29 +01:00 • committed by GitHub
parent b908c7339f
commit 3bfbb94a2a
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1 changed files with 18 additions and 0 deletions
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18
drivers/gpu/drm/panthor/panthor_gem.c
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@ -291,6 +291,23 @@ panthor_gem_create_with_handle(struct drm_file *file,
panthor_gem_debugfs_set_usage_flags(bo, 0);
/* If this is a write-combine mapping, we query the sgt to force a CPU
* cache flush (dma_map_sgtable() is called when the sgt is created).
* This ensures the zero-ing is visible to any uncached mapping created
* by vmap/mmap.
* FIXME: Ideally this should be done when pages are allocated, not at
* BO creation time.
*/
if (shmem->map_wc) {
struct sg_table *sgt;
sgt = drm_gem_shmem_get_pages_sgt(shmem);
if (IS_ERR(sgt)) {
ret = PTR_ERR(sgt);
goto out_put_gem;
}
}
/*
* Allocate an id of idr table where the obj is registered
* and handle has the id what user can see.
@ -299,6 +316,7 @@ panthor_gem_create_with_handle(struct drm_file *file,
if (!ret)
*size = bo->base.base.size;
out_put_gem:
/* drop reference from allocate - handle holds it now. */
drm_gem_object_put(&shmem->base);