kernel/linux.git/drivers/gpu/host1x/bus.c, branch v7.1-rc5

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

host1x: Convert to bus methods

2026-01-13T11:26:32+00:00

The callbacks .probe(), .remove() and .shutdown() for device_drivers should go away. So migrate to bus methods. There are two differences that need addressing: - The bus remove callback returns void while the driver remove callback returns int (the actual value is ignored by the core). - The bus shutdown callback is also called for unbound devices, so an additional check for dev->driver != NULL is needed. Signed-off-by: Uwe Kleine-König Tested-by: Luca Ceresoli # tegra20 tegra-video Reviewed-by: Luca Ceresoli Signed-off-by: Thierry Reding Link: https://patch.msgid.link/dd55d034c68953268ea416aa5c13e41b158fcbb4.1765355236.git.u.kleine-koenig@baylibre.com

host1x: Make remove callback return void

2026-01-13T11:25:38+00:00

The return value of struct device_driver::remove is ignored by the core (see device_remove() in drivers/base/dd.c). So it doesn't make sense to let the host1x remove callback return an int just to ignore it later. So make the callback return void. All current implementors return 0, so they are easily converted. Signed-off-by: Uwe Kleine-König Tested-by: Luca Ceresoli # tegra20 tegra-video Reviewed-by: Luca Ceresoli Signed-off-by: Thierry Reding Link: https://patch.msgid.link/d364fd4ec043d36ee12e46eaef98c57658884f63.1765355236.git.u.kleine-koenig@baylibre.com

gpu: host1x: Allow loading tegra-drm without enabled engines

2025-09-11T16:56:38+00:00

Add support to register host1x devices without requiring subdevices. This ensures syncpoint functionality remains available even when engine subdevices are not present. Add softdep for tegra-drm to make userspace interface available without module autoloading through device tree entries. Signed-off-by: Vamsee Vardhan Thummala [mperttunen@nvidia.com: some rewording] Signed-off-by: Mikko Perttunen Signed-off-by: Thierry Reding Link: https://lore.kernel.org/r/20250708-host1x-allow-no-subdevs-v1-1-93c66c251f03@nvidia.com

gpu: host1x: Use for_each_available_child_of_node_scoped()

2025-05-07T16:09:30+00:00

Avoids the need for manual cleanup of_node_put() in early exits from the loop. Signed-off-by: Jinjie Ruan Signed-off-by: Thierry Reding Link: https://lore.kernel.org/r/20240830073824.3539690-1-ruanjinjie@huawei.com

driver core: have match() callback in struct bus_type take a const *

2024-07-03T13:16:54+00:00

In the match() callback, the struct device_driver * should not be changed, so change the function callback to be a const *. This is one step of many towards making the driver core safe to have struct device_driver in read-only memory. Because the match() callback is in all busses, all busses are modified to handle this properly. This does entail switching some container_of() calls to container_of_const() to properly handle the constant *. For some busses, like PCI and USB and HV, the const * is cast away in the match callback as those busses do want to modify those structures at this point in time (they have a local lock in the driver structure.) That will have to be changed in the future if they wish to have their struct device * in read-only-memory. Cc: Rafael J. Wysocki Reviewed-by: Alex Elder Acked-by: Sumit Garg Link: https://lore.kernel.org/r/2024070136-wrongdoer-busily-01e8@gregkh Signed-off-by: Greg Kroah-Hartman

gpu: host1x: Do not setup DMA for virtual devices

2024-04-08T14:52:58+00:00

The host1x devices are virtual compound devices and do not perform DMA accesses themselves, so they do not need to be set up for DMA. Ideally we would also not need to set up DMA masks for the virtual devices, but we currently still need those for legacy support on old hardware. Tested-by: Jon Hunter Acked-by: Jon Hunter Signed-off-by: Thierry Reding Link: https://patchwork.freedesktop.org/patch/msgid/20240314154943.2487549-1-thierry.reding@gmail.com

gpu: host1x: bus: make host1x_bus_type const

2024-02-13T18:10:57+00:00

Since commit d492cc2573a0 ("driver core: device.h: make struct bus_type a const *"), the driver core can properly handle constant struct bus_type, move the host1x_bus_type variable to be a constant structure as well, placing it into read-only memory which can not be modified at runtime. Cc: Greg Kroah-Hartman Suggested-by: Greg Kroah-Hartman Signed-off-by: Ricardo B. Marliere Reviewed-by: Greg Kroah-Hartman Signed-off-by: Thierry Reding Link: https://patchwork.freedesktop.org/patch/msgid/20240213-bus_cleanup-host1x-v1-1-54ec51b5d14f@marliere.net

gpu: host1x: Stop open-coding of_device_uevent()

2023-07-21T07:08:15+00:00

There is apparently no reasons to open-code of_device_uevent() besides: - The helper receives a struct device while we want to use the of_node member of the struct device *parent*. - of_device_uevent() could not be called by modules because of a missing EXPORT_SYMBOL*(). In practice, the former point is not very constraining, just calling of_device_uevent(dev->parent, ...) would have made the trick. The latter point is more an observation rather than a real blocking point because nothing prevented of_uevent() (called by the inline function of_device_uevent()) to be exported to modules. In practice, this helper is now exported, so nothing prevent us from using of_device_uevent() anymore. Let's use the core helper directly instead of open-coding it. Cc: Thierry Reding Cc: David Airlie Cc: Daniel Vetter Cc: Mikko Perttunen Cc: Rob Herring Cc: Frank Rowand Signed-off-by: Miquel Raynal Signed-off-by: Thierry Reding Link: https://patchwork.freedesktop.org/patch/msgid/20230622213214.3586530-3-miquel.raynal@bootlin.com