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drivers: gpu: Fix IOMMU support for Linux v6.13

Browse Source 
In Linux v6.13, commit f6440fcc9c7b ("iommu: Remove
iommu_domain_alloc()") removed iommu_domain_alloc() and was replaced by
iommu_paging_domain_alloc(). Use conftest to detect if the function
iommu_paging_domain_alloc() is supported by the kernel and update the
Tegra DRM and Host1x drivers accordingly.

Bug 4991705

Change-Id: I86221d96232396fdb6bdccf40c412e029881c513
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3261695
(cherry picked from commit e374ac996dceee884296c9f1e53fdd0f281b3e0c)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3499750
Reviewed-by: Brad Griffis <bgriffis@nvidia.com>
Tested-by: Brad Griffis <bgriffis@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
This commit is contained in:
Jon Hunter
2024-12-04 10:40:41 +00:00
committed by mobile promotions
parent 0980dbb86e
commit 0a8d8b47c7
4 changed files with 33 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/gpu/drm/tegra/drm.c
View File

@@ -1182,6 +1182,9 @@ static bool host1x_drm_wants_iommu(struct host1x_device *dev)
static int host1x_drm_probe(struct host1x_device *dev)
{
#if defined(NV_IOMMU_PAGING_DOMAIN_ALLOC_PRESENT) /* Linux v6.11 */
struct device *dma_dev = dev->dev.parent;
#endif
struct tegra_drm *tegra;
struct drm_device *drm;
int err;
@@ -1196,8 +1199,13 @@ static int host1x_drm_probe(struct host1x_device *dev)
goto put;
}
#if defined(NV_IOMMU_PAGING_DOMAIN_ALLOC_PRESENT) /* Linux v6.11 */
if (host1x_drm_wants_iommu(dev) && device_iommu_mapped(dma_dev)) {
tegra->domain = iommu_paging_domain_alloc(dma_dev);
#else
if (host1x_drm_wants_iommu(dev) && iommu_present(&platform_bus_type)) {
tegra->domain = iommu_domain_alloc(&platform_bus_type);
#endif
if (!tegra->domain) {
err = -ENOMEM;
goto free;

7
drivers/gpu/host1x/dev.c
View File

@@ -620,9 +620,16 @@ static struct iommu_domain *host1x_iommu_attach(struct host1x *host)
if (err < 0)
goto put_group;
#if defined(NV_IOMMU_PAGING_DOMAIN_ALLOC_PRESENT) /* Linux v6.11 */
host->domain = iommu_paging_domain_alloc(host->dev);
if (IS_ERR(host->domain)) {
err = PTR_ERR(host->domain);
host->domain = NULL;
#else
host->domain = iommu_domain_alloc(&platform_bus_type);
if (!host->domain) {
err = -ENOMEM;
#endif
goto put_cache;
}

1
scripts/conftest/Makefile
View File

@@ -140,6 +140,7 @@ NV_CONFTEST_FUNCTION_COMPILE_TESTS += i2c_driver_struct_remove_return_type_int
NV_CONFTEST_FUNCTION_COMPILE_TESTS += i2c_mux_add_adapter_has_no_class_argument
NV_CONFTEST_FUNCTION_COMPILE_TESTS += iio_dev_opaque_has_mlock
NV_CONFTEST_FUNCTION_COMPILE_TESTS += iommu_map_has_gfp_arg
NV_CONFTEST_FUNCTION_COMPILE_TESTS += iommu_paging_domain_alloc
NV_CONFTEST_FUNCTION_COMPILE_TESTS += irq_get_nr_irqs
NV_CONFTEST_FUNCTION_COMPILE_TESTS += kthread_complete_and_exit
NV_CONFTEST_FUNCTION_COMPILE_TESTS += media_entity_remote_pad

17
scripts/conftest/conftest.sh
View File

@@ -7437,6 +7437,23 @@ compile_test() {
compile_check_conftest "$CODE" "NV_NETIF_NAPI_ADD_WEIGHT_PRESENT" "" "functions"
;;
iommu_paging_domain_alloc)
#
# Determine if iommu_paging_domain_alloc() function is present
#
# Added by commit a27bf2743cb8 ("iommu: Add iommu_paging_domain_alloc()
# interface") in Linux v6.11.
#
CODE="
#include <linux/iommu.h>
void conftest_iommu_paging_domain_alloc(void)
{
iommu_paging_domain_alloc();
}
"
compile_check_conftest "$CODE" "NV_IOMMU_PAGING_DOMAIN_ALLOC_PRESENT" "" "functions"
;;
iommu_map_has_gfp_arg)
#
# Determine if iommu_map() has 'gfp' argument.