Commit b4672c8a authored by Alex Sierra's avatar Alex Sierra Committed by Alex Deucher

amd/amdgpu: force to trigger a no-retry-fault after a retry-fault

Only for the debugger use case.

[why]
Avoid endless translation retries, after an invalid address access has
been issued to the GPU. Instead, the trap handler is forced to enter by
generating a no-retry-fault.
A s_trap instruction is inserted in the debugger case to let the wave to
enter trap handler to save context.

[how]
Intentionally using an invalid flag combination (F and P set at the same
time) to trigger a no-retry-fault, after a retry-fault happens. This is
only valid under compute context.
Signed-off-by: default avatarAlex Sierra <alex.sierra@amd.com>
Reviewed-by: default avatarFelix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent f43ef951
......@@ -3197,11 +3197,20 @@ bool amdgpu_vm_handle_fault(struct amdgpu_device *adev, unsigned int pasid,
flags = AMDGPU_PTE_VALID | AMDGPU_PTE_SNOOPED |
AMDGPU_PTE_SYSTEM;
if (amdgpu_vm_fault_stop == AMDGPU_VM_FAULT_STOP_NEVER) {
if (vm->is_compute_context) {
/* Intentionally setting invalid PTE flag
* combination to force a no-retry-fault
*/
flags = AMDGPU_PTE_EXECUTABLE | AMDGPU_PDE_PTE |
AMDGPU_PTE_TF;
value = 0;
} else if (amdgpu_vm_fault_stop == AMDGPU_VM_FAULT_STOP_NEVER) {
/* Redirect the access to the dummy page */
value = adev->dummy_page_addr;
flags |= AMDGPU_PTE_EXECUTABLE | AMDGPU_PTE_READABLE |
AMDGPU_PTE_WRITEABLE;
} else {
/* Let the hw retry silently on the PTE */
value = 0;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment