drm/amdgpu: fix fundamental suspend/resume issue

Reinitializing the VM manager during suspend/resume is a very very bad
idea since all the VMs are still active and kicking.

This can lead to random VM faults after resume when new processes
become the same client ID assigned.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

6 files changed, 30 insertions, 54 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 07ff3b1514f1..1bf36c3542c1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -672,6 +672,7 @@ void amdgpu_vm_reset_id(struct amdgpu_device *adev, unsigned vmhub,
 	struct amdgpu_vm_id_manager *id_mgr = &adev->vm_manager.id_mgr[vmhub];
 	struct amdgpu_vm_id *id = &id_mgr->ids[vmid];
 
+	atomic64_set(&id->owner, 0);
 	id->gds_base = 0;
 	id->gds_size = 0;
 	id->gws_base = 0;
@@ -681,6 +682,26 @@ void amdgpu_vm_reset_id(struct amdgpu_device *adev, unsigned vmhub,
 }
 
 /**
+ * amdgpu_vm_reset_all_id - reset VMID to zero
+ *
+ * @adev: amdgpu device structure
+ *
+ * Reset VMID to force flush on next use
+ */
+void amdgpu_vm_reset_all_ids(struct amdgpu_device *adev)
+{
+	unsigned i, j;
+
+	for (i = 0; i < AMDGPU_MAX_VMHUBS; ++i) {
+		struct amdgpu_vm_id_manager *id_mgr =
+			&adev->vm_manager.id_mgr[i];
+
+		for (j = 1; j < id_mgr->num_ids; ++j)
+			amdgpu_vm_reset_id(adev, i, j);
+	}
+}
+
+/**
  * amdgpu_vm_bo_find - find the bo_va for a specific vm & bo
  *
  * @vm: requested vm
@@ -2270,7 +2291,6 @@ void amdgpu_vm_manager_init(struct amdgpu_device *adev)
 	for (i = 0; i < AMDGPU_MAX_RINGS; ++i)
 		adev->vm_manager.seqno[i] = 0;
 
-
 	atomic_set(&adev->vm_manager.vm_pte_next_ring, 0);
 	atomic64_set(&adev->vm_manager.client_counter, 0);
 	spin_lock_init(&adev->vm_manager.prt_lock);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
index d97e28b4bdc4..e1d951ece433 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
@@ -204,6 +204,7 @@ int amdgpu_vm_grab_id(struct amdgpu_vm *vm, struct amdgpu_ring *ring,
 int amdgpu_vm_flush(struct amdgpu_ring *ring, struct amdgpu_job *job);
 void amdgpu_vm_reset_id(struct amdgpu_device *adev, unsigned vmhub,
 			unsigned vmid);
+void amdgpu_vm_reset_all_ids(struct amdgpu_device *adev);
 int amdgpu_vm_update_directories(struct amdgpu_device *adev,
 				 struct amdgpu_vm *vm);
 int amdgpu_vm_clear_freed(struct amdgpu_device *adev,
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
index a572979f186c..d860939152df 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
@@ -950,10 +950,6 @@ static int gmc_v6_0_suspend(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 
-	if (adev->vm_manager.enabled) {
-		gmc_v6_0_vm_fini(adev);
-		adev->vm_manager.enabled = false;
-	}
 	gmc_v6_0_hw_fini(adev);
 
 	return 0;
@@ -968,16 +964,9 @@ static int gmc_v6_0_resume(void *handle)
 	if (r)
 		return r;
 
-	if (!adev->vm_manager.enabled) {
-		r = gmc_v6_0_vm_init(adev);
-		if (r) {
-			dev_err(adev->dev, "vm manager initialization failed (%d).\n", r);
-			return r;
-		}
-		adev->vm_manager.enabled = true;
-	}
+	amdgpu_vm_reset_all_ids(adev);
 
-	return r;
+	return 0;
 }
 
 static bool gmc_v6_0_is_idle(void *handle)
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
index a9083a16a250..2750e5c23813 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
@@ -1117,10 +1117,6 @@ static int gmc_v7_0_suspend(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 
-	if (adev->vm_manager.enabled) {
-		gmc_v7_0_vm_fini(adev);
-		adev->vm_manager.enabled = false;
-	}
 	gmc_v7_0_hw_fini(adev);
 
 	return 0;
@@ -1135,16 +1131,9 @@ static int gmc_v7_0_resume(void *handle)
 	if (r)
 		return r;
 
-	if (!adev->vm_manager.enabled) {
-		r = gmc_v7_0_vm_init(adev);
-		if (r) {
-			dev_err(adev->dev, "vm manager initialization failed (%d).\n", r);
-			return r;
-		}
-		adev->vm_manager.enabled = true;
-	}
+	amdgpu_vm_reset_all_ids(adev);
 
-	return r;
+	return 0;
 }
 
 static bool gmc_v7_0_is_idle(void *handle)
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
index 4ac99784160a..f56b4089ee9f 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
@@ -1209,10 +1209,6 @@ static int gmc_v8_0_suspend(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 
-	if (adev->vm_manager.enabled) {
-		gmc_v8_0_vm_fini(adev);
-		adev->vm_manager.enabled = false;
-	}
 	gmc_v8_0_hw_fini(adev);
 
 	return 0;
@@ -1227,16 +1223,9 @@ static int gmc_v8_0_resume(void *handle)
 	if (r)
 		return r;
 
-	if (!adev->vm_manager.enabled) {
-		r = gmc_v8_0_vm_init(adev);
-		if (r) {
-			dev_err(adev->dev, "vm manager initialization failed (%d).\n", r);
-			return r;
-		}
-		adev->vm_manager.enabled = true;
-	}
+	amdgpu_vm_reset_all_ids(adev);
 
-	return r;
+	return 0;
 }
 
 static bool gmc_v8_0_is_idle(void *handle)
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index dc1e1c1d6b24..f936332a069d 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -791,10 +791,6 @@ static int gmc_v9_0_suspend(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 
-	if (adev->vm_manager.enabled) {
-		gmc_v9_0_vm_fini(adev);
-		adev->vm_manager.enabled = false;
-	}
 	gmc_v9_0_hw_fini(adev);
 
 	return 0;
@@ -809,17 +805,9 @@ static int gmc_v9_0_resume(void *handle)
 	if (r)
 		return r;
 
-	if (!adev->vm_manager.enabled) {
-		r = gmc_v9_0_vm_init(adev);
-		if (r) {
-			dev_err(adev->dev,
-				"vm manager initialization failed (%d).\n", r);
-			return r;
-		}
-		adev->vm_manager.enabled = true;
-	}
+	amdgpu_vm_reset_all_ids(adev);
 
-	return r;
+	return 0;
 }
 
 static bool gmc_v9_0_is_idle(void *handle)