[PATCH] drm/amdgpu: Add mutex locking to VMID Manager Initialization for Process Isolation

[Srinivasan Shanmugam]

This commit adds mutex locking to the `amdgpu_vmid_mgr_init` function.
By acquiring and releasing the `enforce_isolation_mutex`, so that it now
safely allocates reserved VMIDs, which is important for enforcing
isolation between different GPU processes.

Mutex ensures that the process of allocating VMIDs is done
correctly and without interference

Fixes: 96595204195d ("drm/amdgpu: Make enforce_isolation setting per GPU")
Cc: Christian König <christian.koenig at amd.com>
Cc: Alex Deucher <alexander.deucher at amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c
index 8e712a11aba5..6ae835a7f031 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c
@@ -602,10 +602,12 @@ void amdgpu_vmid_mgr_init(struct amdgpu_device *adev)
 		}
 	}
 	/* alloc a default reserved vmid to enforce isolation */
+	mutex_lock(&adev->enforce_isolation_mutex);
 	for (i = 0; i < (adev->xcp_mgr ? adev->xcp_mgr->num_xcps : 1); i++) {
 		if (adev->enforce_isolation[i])
 			amdgpu_vmid_alloc_reserved(adev, AMDGPU_GFXHUB(i));
 	}
+	mutex_unlock(&adev->enforce_isolation_mutex);
 }
 
 /**
-- 
2.34.1