kernel/drivers/gpu/host1x/context.c, branch linux-6.2.y

gpu: host1x: Fix memory leak of device names

2023-05-11T14:11:02Z

[ Upstream commit 55879dad0f3ae8468444b42f785ad79eac05fe5b ] The device names allocated by dev_set_name() need be freed before module unloading, but they can not be freed because the kobject's refcount which was set in device_initialize() has not be decreased to 0. As comment of device_add() says, if it fails, use only put_device() drop the refcount, then the name will be freed in kobejct_cleanup(). device_del() and put_device() can be replaced with device_unregister(), so call it to unregister the added successfully devices, and just call put_device() to the not added device. Add a release() function to device to avoid null release() function WARNING in device_release(), it's empty, because the context devices are freed together in host1x_memory_context_list_free(). Fixes: 8aa5bcb61612 ("gpu: host1x: Add context device management code") Signed-off-by: Yang Yingliang Reviewed-by: Mikko Perttunen Signed-off-by: Thierry Reding Signed-off-by: Sasha Levin

gpu: host1x: Fix potential double free if IOMMU is disabled

2023-05-11T14:11:02Z

[ Upstream commit 8466ff24a37a9a18fb935e90dda64f049131ae28 ] If context device has no IOMMU, the 'cdl->devs' is freed in error path, but host1x_memory_context_list_init() doesn't return an error code, so the module can be loaded successfully, when it's unloading, the host1x_memory_context_list_free() is called in host1x_remove(), it will cause double free. Set the 'cdl->devs' to NULL after freeing it to avoid double free. Fixes: 8aa5bcb61612 ("gpu: host1x: Add context device management code") Signed-off-by: Yang Yingliang Reviewed-by: Mikko Perttunen Signed-off-by: Thierry Reding Signed-off-by: Sasha Levin

gpu: host1x: Select context device based on attached IOMMU

2022-11-25T15:14:19Z

On Tegra234, engines that are programmed through Host1x channels can be attached to either the NISO0 or NISO1 SMMU. Because of that, when selecting a context device to use with an engine, we need to select one that is also attached to the same SMMU. Add a parameter to host1x_memory_context_alloc to specify which device we are allocating a context for, and use it to pick an appropriate context device. Signed-off-by: Mikko Perttunen [treding@nvidia.com: update !IOMMU_API stub signature] Signed-off-by: Thierry Reding

gpu: host1x: Add context device management code

2022-07-08T14:27:52Z

Add code to register context devices from device tree, allocate them out and manage their refcounts. Signed-off-by: Mikko Perttunen Signed-off-by: Thierry Reding