From 70a423f15d232228f22c14814afd420b0a718fdc Mon Sep 17 00:00:00 2001
From: Dmitry Osipenko <digetx@gmail.com>
Date: Sat, 4 Dec 2021 17:58:49 +0300
Subject: drm/tegra: Add back arm_iommu_detach_device()
Git-commit: d210919dbdc8a82c676cc3e3c370b1802be63124
Patch-mainline: v5.17-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
DMA buffers of 2D/3D engines aren't mapped properly when
CONFIG_ARM_DMA_USE_IOMMU=y. The memory management code of Tegra DRM driver
has a longstanding overhaul overdue and it's not obvious where the problem
is in this case. Hence let's add back the old workaround which we already
had sometime before. It explicitly detaches DRM devices from the offending
implicit IOMMU domain. This fixes a completely broken 2d/3d drivers in
case of ARM32 multiplatform kernel config.
Cc: stable@vger.kernel.org
Fixes: fa6661b7aa0b ("drm/tegra: Optionally attach clients to the IOMMU")
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/tegra/drm.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index dc04ce329be3..e9de91a4e7e8 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -22,6 +22,10 @@
#include <drm/drm_prime.h>
#include <drm/drm_vblank.h>
+#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
+#include <asm/dma-iommu.h>
+#endif
+
#include "dc.h"
#include "drm.h"
#include "gem.h"
@@ -945,6 +949,17 @@ int host1x_client_iommu_attach(struct host1x_client *client)
struct iommu_group *group = NULL;
int err;
+#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);
+
+ domain = iommu_get_domain_for_dev(client->dev);
+ }
+#endif
+
/*
* If the host1x client is already attached to an IOMMU domain that is
* not the shared IOMMU domain, don't try to attach it to a different
--
2.38.1