linux-kernel - [PATCH AUTOSEL 6.10 12/34] drm/amdgpu: Add lock around VF RLCG interface

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240728154230.2046786-12-sashal@kernel.org>
Date: Sun, 28 Jul 2024 11:40:36 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Victor Skvortsov <victor.skvortsov@....com>,
	Zhigang Luo <zhigang.luo@....com>,
	Alex Deucher <alexander.deucher@....com>,
	Sasha Levin <sashal@...nel.org>,
	christian.koenig@....com,
	Xinhui.Pan@....com,
	airlied@...il.com,
	daniel@...ll.ch,
	Hawking.Zhang@....com,
	mario.limonciello@....com,
	lijo.lazar@....com,
	Jun.Ma2@....com,
	candice.li@....com,
	victorchengchi.lu@....com,
	andrealmeid@...lia.com,
	hamza.mahfooz@....com,
	Zhigang.Luo@....com,
	surbhi.kakarya@....com,
	sunran001@...suo.com,
	chongli2@....com,
	danijel.slivka@....com,
	Jingwen.Chen2@....com,
	YiPeng.Chai@....com,
	bokun.zhang@....com,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.10 12/34] drm/amdgpu: Add lock around VF RLCG interface

From: Victor Skvortsov <victor.skvortsov@....com>

[ Upstream commit e864180ee49b4d30e640fd1e1d852b86411420c9 ]

flush_gpu_tlb may be called from another thread while
device_gpu_recover is running.

Both of these threads access registers through the VF
RLCG interface during VF Full Access. Add a lock around this interface
to prevent race conditions between these threads.

Signed-off-by: Victor Skvortsov <victor.skvortsov@....com>
Reviewed-by: Zhigang Luo <zhigang.luo@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c   | 6 ++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h   | 2 ++
 3 files changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 33f791d92ddf3..eb4a1f4318333 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -4048,6 +4048,7 @@ int amdgpu_device_init(struct amdgpu_device *adev,
 	mutex_init(&adev->grbm_idx_mutex);
 	mutex_init(&adev->mn_lock);
 	mutex_init(&adev->virt.vf_errors.lock);
+	mutex_init(&adev->virt.rlcg_reg_lock);
 	hash_init(adev->mn_hash);
 	mutex_init(&adev->psp.mutex);
 	mutex_init(&adev->notifier_lock);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
index 54ab51a4ada77..972a58f0f4924 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
@@ -980,6 +980,9 @@ u32 amdgpu_virt_rlcg_reg_rw(struct amdgpu_device *adev, u32 offset, u32 v, u32 f
 	scratch_reg1 = (void __iomem *)adev->rmmio + 4 * reg_access_ctrl->scratch_reg1;
 	scratch_reg2 = (void __iomem *)adev->rmmio + 4 * reg_access_ctrl->scratch_reg2;
 	scratch_reg3 = (void __iomem *)adev->rmmio + 4 * reg_access_ctrl->scratch_reg3;
+
+	mutex_lock(&adev->virt.rlcg_reg_lock);
+
 	if (reg_access_ctrl->spare_int)
 		spare_int = (void __iomem *)adev->rmmio + 4 * reg_access_ctrl->spare_int;
 
@@ -1036,6 +1039,9 @@ u32 amdgpu_virt_rlcg_reg_rw(struct amdgpu_device *adev, u32 offset, u32 v, u32 f
 	}
 
 	ret = readl(scratch_reg0);
+
+	mutex_unlock(&adev->virt.rlcg_reg_lock);
+
 	return ret;
 }
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
index 642f1fd287d83..0ec246c74570c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
@@ -272,6 +272,8 @@ struct amdgpu_virt {
 
 	/* the ucode id to signal the autoload */
 	uint32_t autoload_ucode_id;
+
+	struct mutex rlcg_reg_lock;
 };
 
 struct amdgpu_video_codec_info;
-- 
2.43.0