kernel/linux.git/drivers/gpu/drm/tegra/submit.c, branch v7.2-rc1

gpu: host1x: Allow entries in BO caches to be freed

2026-05-28T15:19:28+00:00

When a buffer object is pinned via host1x_bo_pin() with a cache, the resulting mapping is kept in the cache so it can be reused on subsequent pins. Each mapping held a reference to the underlying host1x_bo (taken in tegra_bo_pin / gather_bo_pin), so as long as a mapping was cached, the bo itself could not be freed. However, the only way to remove the cached mapping was through the free path of the buffer object. This meant that if a bo got cached, it could never get freed again. Resolve the circularity by holding a weak reference to the bo from the cache side. This is done by having the .pin callbacks not bump the bo's refcount -- instead the common Host1x bo code does so, except for the cache reference. Also move the remove-cache-mapping-on-free code into a common function inside Host1x code. This is only called from the TegraDRM GEM buffers since those are the only ones that can be cached at the moment. Reported-by: Aaron Kling Fixes: 1f39b1dfa53c ("drm/tegra: Implement buffer object cache") Signed-off-by: Mikko Perttunen Tested-by: Aaron Kling Signed-off-by: Thierry Reding Link: https://patch.msgid.link/20260515-host1x-bocache-leak-v1-1-a0375f68aeab@nvidia.com

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51+00:00

This was done entirely with mindless brute force, using git grep -l '\

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

drm/tegra: Use tegra_dev_iommu_get_stream_id()

2023-01-27T16:49:43+00:00

Use the newly implemented tegra_dev_iommu_get_stream_id() helper to encapsulate and centralize the IOMMU stream ID access. Signed-off-by: Thierry Reding

drm/tegra: Remove redundant null checks before kfree

2023-01-26T14:55:39+00:00

Fix the following coccicheck warning: ./drivers/gpu/drm/tegra/submit.c:689:2-7: WARNING: NULL check before some freeing functions is not needed. Signed-off-by: Yushan Zhou Signed-off-by: Thierry Reding

gpu: host1x: External timeout/cancellation for fences

2023-01-26T14:55:38+00:00

Currently all fences have a 30 second timeout to ensure they are cleaned up if the fence never completes otherwise. However, this one size fits all solution doesn't actually fit in every case, such as syncpoint waiting where we want to be able to have timeouts longer than 30 seconds. As such, we want to be able to give control over fence cancellation to the caller (and maybe eventually get rid of the internal timeout altogether). Here we add this cancellation mechanism by essentially adding a function for entering the timeout path by function call, and changing the syncpoint wait function to use it. Signed-off-by: Mikko Perttunen Signed-off-by: Thierry Reding

drm/tegra: Make gather_bo_ops static

2022-11-25T15:14:59+00:00

The symbol is not used outside of the file, so mark it static. Fixes the following warning: ./drivers/gpu/drm/tegra/submit.c:136:28: warning: symbol 'gather_bo_ops' was not declared. Should it be static? Signed-off-by: ruanjinjie Signed-off-by: Thierry Reding

drm/tegra: Switch over to vmemdup_user()

2022-11-25T15:14:58+00:00

This patch fixes the following Coccinelle warning: drivers/gpu/drm/tegra/submit.c:173: WARNING opportunity for vmemdup_user Use vmemdup_user() rather than duplicating its implementation. This is a little bit restricted to reduce false positives. Signed-off-by: Qing Wang Signed-off-by: Thierry Reding

drm/tegra: Support context isolation

2022-07-08T14:27:52+00:00

For engines that support context isolation, allocate a context when opening a channel, and set up stream ID offset and context fields when submitting a job. As of this commit, the stream ID offset and fallback stream ID are not used when context isolation is disabled. However, with upcoming patches that enable a full featured job opcode sequence, these will be necessary. Signed-off-by: Mikko Perttunen Signed-off-by: Thierry Reding

drm/tegra: submit: Remove pm_runtime_enabled() checks

2021-12-16T13:07:08+00:00

Runtime PM is now universally available, make it mandatory by removing the pm_runtime_enabled() checks. Reviewed-by: Ulf Hansson Signed-off-by: Dmitry Osipenko Signed-off-by: Thierry Reding