diff options
| author | Alex Sierra <alex.sierra@amd.com> | 2019-11-19 00:33:07 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2019-11-22 22:20:23 +0300 |
| commit | b4672c8a84beba6d04dc564b02e439590b5c93f7 (patch) | |
| tree | 1b958dcbbc370510e3997b7304ea14f44565fa97 | |
| parent | f43ef951f6c0ddd71787b28de4e5d96b40c832ca (diff) | |
| download | linux-b4672c8a84beba6d04dc564b02e439590b5c93f7.tar.xz | |
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: Alex Sierra <alex.sierra@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c index 63f6e46bd642..f20b572d2438 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c @@ -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; |