linux-kernel - [PATCH 5.10 215/575] drm/amdkfd: fix resume error when iommu disabled in Picasso

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Date:   Mon, 15 Nov 2021 17:59:00 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, youling <youling257@...il.com>,
        Yifan Zhang <yifan1.zhang@....com>,
        James Zhu <James.Zhu@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 215/575] drm/amdkfd: fix resume error when iommu disabled in Picasso

From: Yifan Zhang <yifan1.zhang@....com>

[ Upstream commit 6f4b590aae217da16cfa44039a2abcfb209137ab ]

When IOMMU disabled in sbios and kfd in iommuv2 path,
IOMMU resume failure blocks system resume. Don't allow kfd to
use iommu v2 when iommu is disabled.

Reported-by: youling <youling257@...il.com>
Tested-by: youling <youling257@...il.com>
Signed-off-by: Yifan Zhang <yifan1.zhang@....com>
Reviewed-by: James Zhu <James.Zhu@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/amdkfd/kfd_device.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device.c b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
index 903170e59342c..5751bddc9cadd 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
@@ -744,6 +744,7 @@ bool kgd2kfd_device_init(struct kfd_dev *kfd,
 	kfd_double_confirm_iommu_support(kfd);
 
 	if (kfd_iommu_device_init(kfd)) {
+		kfd->use_iommu_v2 = false;
 		dev_err(kfd_device, "Error initializing iommuv2\n");
 		goto device_iommu_error;
 	}
-- 
2.33.0