linux-kernel - [PATCH 5.4 35/43] drm/nouveau/tegra: Stop using iommu

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Message-Id: <20220516193615.754563112@linuxfoundation.org>
Date:   Mon, 16 May 2022 21:36:46 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Robin Murphy <robin.murphy@....com>,
        Lyude Paul <lyude@...hat.com>
Subject: [PATCH 5.4 35/43] drm/nouveau/tegra: Stop using iommu_present()

From: Robin Murphy <robin.murphy@....com>

commit 87fd2b091fb33871a7f812658a0971e8e26f903f upstream.

Even if some IOMMU has registered itself on the platform "bus", that
doesn't necessarily mean it provides translation for the device we
care about. Replace iommu_present() with a more appropriate check.

Signed-off-by: Robin Murphy <robin.murphy@....com>
Reviewed-by: Lyude Paul <lyude@...hat.com>
[added cc for stable]
Signed-off-by: Lyude Paul <lyude@...hat.com>
Cc: stable@...r.kernel.org # v5.0+
Link: https://patchwork.freedesktop.org/patch/msgid/70d40ea441da3663c2824d54102b471e9a621f8a.1649168494.git.robin.murphy@arm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
@@ -123,7 +123,7 @@ nvkm_device_tegra_probe_iommu(struct nvk
 
 	mutex_init(&tdev->iommu.mutex);
 
-	if (iommu_present(&platform_bus_type)) {
+	if (device_iommu_mapped(dev)) {
 		tdev->iommu.domain = iommu_domain_alloc(&platform_bus_type);
 		if (!tdev->iommu.domain)
 			goto error;