korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-12-23 02:54:32 +08:00
Code Issues Packages Projects Releases Wiki Activity

drm/tegra: Detach devices from IOMMU DMA domain on arm32

Browse Source 
All Tegra DRM devices are getting attached to an implicit IOMMU DMA
domain if CONFIG_ARM_DMA_USE_IOMMU=y. Since Tegra DRM driver manages IOMMU
by itself, the devices must be detached from the implicit domain using
arch-specific IOMMU-API. Note that this works only for arm32 and not for
arm64, which will remain broken if CONFIG_IOMMU_DMA is enabled.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Dmitry Osipenko 2018-08-19 17:24:20 +03:00 committed by Thierry Reding
parent e31c8ea5af
commit 5ac93f8109
1 changed files with 12 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/gpu/drm/tegra/drm.c
View File

@ -15,6 +15,10 @@
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
#include <asm/dma-iommu.h>
#endif
#include "drm.h"
#include "gem.h"
@ -1068,6 +1072,14 @@ struct iommu_group *host1x_client_iommu_attach(struct host1x_client *client,
}
if (!shared || (shared && (group != tegra->group))) {
#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
if (client->dev->archdata.mapping) {
struct dma_iommu_mapping *mapping =
to_dma_iommu_mapping(client->dev);
arm_iommu_detach_device(client->dev);
arm_iommu_release_mapping(mapping);
}
#endif
err = iommu_attach_group(tegra->domain, group);
if (err < 0) {
iommu_group_put(group);