drm/amdgpu: change vm->task_info handling

This patch changes the handling and lifecycle of vm->task_info object.
The major changes are:
- vm->task_info is a dynamically allocated ptr now, and its uasge is
  reference counted.
- introducing two new helper funcs for task_info lifecycle management
    - amdgpu_vm_get_task_info: reference counts up task_info before
      returning this info
    - amdgpu_vm_put_task_info: reference counts down task_info
- last put to task_info() frees task_info from the vm.

This patch also does logistical changes required for existing usage
of vm->task_info.

V2: Do not block all the prints when task_info not found (Felix)

V3: Fixed review comments from Felix
   - Fix wrong indentation
   - No debug message for -ENOMEM
   - Add NULL check for task_info
   - Do not duplicate the debug messages (ti vs no ti)
   - Get first reference of task_info in vm_init(), put last
     in vm_fini()

V4: Fixed review comments from Felix
   - fix double reference increment in create_task_info
   - change amdgpu_vm_get_task_info_pasid
   - additional changes in amdgpu_gem.c while porting

Cc: Christian Koenig <christian.koenig@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Shashank Sharma <shashank.sharma@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 13 insertions, 9 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c b/drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c
index fec5a3d1c4bc..eaa4f5f49949 100644
--- a/drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c
+++ b/drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c
@@ -1644,7 +1644,7 @@ static int sdma_v4_4_2_print_iv_entry(struct amdgpu_device *adev,
 					      struct amdgpu_iv_entry *entry)
 {
 	int instance;
-	struct amdgpu_task_info task_info;
+	struct amdgpu_task_info *task_info;
 	u64 addr;
 
 	instance = sdma_v4_4_2_irq_id_to_seq(entry->client_id);
@@ -1656,15 +1656,19 @@ static int sdma_v4_4_2_print_iv_entry(struct amdgpu_device *adev,
 	addr = (u64)entry->src_data[0] << 12;
 	addr |= ((u64)entry->src_data[1] & 0xf) << 44;
 
-	memset(&task_info, 0, sizeof(struct amdgpu_task_info));
-	amdgpu_vm_get_task_info(adev, entry->pasid, &task_info);
-
 	dev_dbg_ratelimited(adev->dev,
-		   "[sdma%d] address:0x%016llx src_id:%u ring:%u vmid:%u "
-		   "pasid:%u, for process %s pid %d thread %s pid %d\n",
-		   instance, addr, entry->src_id, entry->ring_id, entry->vmid,
-		   entry->pasid, task_info.process_name, task_info.tgid,
-		   task_info.task_name, task_info.pid);
+			    "[sdma%d] address:0x%016llx src_id:%u ring:%u vmid:%u pasid:%u\n",
+			    instance, addr, entry->src_id, entry->ring_id, entry->vmid,
+			    entry->pasid);
+
+	task_info = amdgpu_vm_get_task_info_pasid(adev, entry->pasid);
+	if (task_info) {
+		dev_dbg_ratelimited(adev->dev, " for process %s pid %d thread %s pid %d\n",
+				    task_info->process_name, task_info->tgid,
+				    task_info->task_name, task_info->pid);
+		amdgpu_vm_put_task_info(task_info);
+	}
+
 	return 0;
 }