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 <[email protected]>
Cc: Alex Deucher <[email protected]>
Cc: Felix Kuehling <[email protected]>
Reviewed-by: Felix Kuehling <[email protected]>
Signed-off-by: Shashank Sharma <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

1 files changed, 10 insertions, 2 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c
index 4baa300121d8..a59364e9b6ed 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c
@@ -230,8 +230,16 @@ void amdgpu_coredump(struct amdgpu_device *adev, bool vram_lost,
 
 	coredump->reset_vram_lost = vram_lost;
 
-	if (reset_context->job && reset_context->job->vm)
-		coredump->reset_task_info = reset_context->job->vm->task_info;
+	if (reset_context->job && reset_context->job->vm) {
+		struct amdgpu_task_info *ti;
+		struct amdgpu_vm *vm = reset_context->job->vm;
+
+		ti = amdgpu_vm_get_task_info_vm(vm);
+		if (ti) {
+			coredump->reset_task_info = *ti;
+			amdgpu_vm_put_task_info(ti);
+		}
+	}
 
 	coredump->adev = adev;