This is a note to let you know that I've just added the patch titled
gpu: host1x: Add back arm_iommu_detach_device()
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
gpu-host1x-add-back-arm_iommu_detach_device.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d5185965c3b59073c4520bad7dd2adf725b9abba Mon Sep 17 00:00:00 2001
From: Dmitry Osipenko <digetx@xxxxxxxxx>
Date: Sat, 4 Dec 2021 17:58:48 +0300
Subject: gpu: host1x: Add back arm_iommu_detach_device()
From: Dmitry Osipenko <digetx@xxxxxxxxx>
commit d5185965c3b59073c4520bad7dd2adf725b9abba upstream.
Host1x DMA buffer isn't mapped properly when CONFIG_ARM_DMA_USE_IOMMU=y.
The memory management code of Host1x 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 Host1x device from the offending implicit IOMMU
domain. This fixes a completely broken Host1x DMA in case of ARM32
multiplatform kernel config.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: af1cbfb9bf0f ("gpu: host1x: Support DMA mapping of buffers")
Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/host1x/dev.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
--- a/drivers/gpu/host1x/dev.c
+++ b/drivers/gpu/host1x/dev.c
@@ -18,6 +18,10 @@
#include <trace/events/host1x.h>
#undef CREATE_TRACE_POINTS
+#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
+#include <asm/dma-iommu.h>
+#endif
+
#include "bus.h"
#include "channel.h"
#include "debug.h"
@@ -232,6 +236,17 @@ static struct iommu_domain *host1x_iommu
struct iommu_domain *domain = iommu_get_domain_for_dev(host->dev);
int err;
+#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
+ if (host->dev->archdata.mapping) {
+ struct dma_iommu_mapping *mapping =
+ to_dma_iommu_mapping(host->dev);
+ arm_iommu_detach_device(host->dev);
+ arm_iommu_release_mapping(mapping);
+
+ domain = iommu_get_domain_for_dev(host->dev);
+ }
+#endif
+
/*
* We may not always want to enable IOMMU support (for example if the
* host1x firewall is already enabled and we don't support addressing
Patches currently in stable-queue which might be from digetx@xxxxxxxxx are
queue-5.10/gpu-host1x-add-back-arm_iommu_detach_device.patch
