Dear Qiang Yu,
Am 21.02.22 um 11:12 schrieb Qiang Yu:
Thank you for your patch. Reading the commit message summary, I have no
idea what “check vm ready by evicting” means. Can you please rephrase it?
> Workstation application ANSA/META get this error dmesg:
What version, and how can this be reproduced exactly? Just by starting
the application?
> [drm:amdgpu_gem_va_ioctl [amdgpu]] *ERROR* Couldn't update BO_VA (-16)
>
> This is caused by:
> 1. create a 256MB buffer in invisible VRAM
> 2. CPU map the buffer and access it causes vm_fault and try to move
> it to visible VRAM
> 3. force visible VRAM space and traverse all VRAM bos to check if
> evicting this bo is valuable
> 4. when checking a VM bo (in invisible VRAM), amdgpu_vm_evictable()
> will set amdgpu_vm->evicting, but latter due to not in visible
> VRAM, won't really evict it so not add it to amdgpu_vm->evicted
> 5. before next CS to clear the amdgpu_vm->evicting, user VM ops
> ioctl will pass amdgpu_vm_ready() (check amdgpu_vm->evicted)
> but fail in amdgpu_vm_bo_update_mapping() (check
> amdgpu_vm->evicting) and get this error log
>
> This error won't affect functionality as next CS will finish the
> waiting VM ops. But we'd better clear the error log by check the
s/check/checking/
> evicting flag which really stop VM ops latter.
stop*s*?
Can you please elaborate. Christian’s and your discussions was quite
long, so adding a summary, why this approach works and what possible
regressions there are going to be might be warranted.
Kind regards,
Paul
> Signed-off-by: Qiang Yu <[email protected]>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 9 +++++++--
> 1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> index 37acd8911168..2cd9f1a2e5fa 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> @@ -770,11 +770,16 @@ int amdgpu_vm_validate_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
> * Check if all VM PDs/PTs are ready for updates
> *
> * Returns:
> - * True if eviction list is empty.
> + * True if VM is not evicting.
> */
> bool amdgpu_vm_ready(struct amdgpu_vm *vm)
> {
> - return list_empty(&vm->evicted);
> + bool ret;
> +
> + amdgpu_vm_eviction_lock(vm);
> + ret = !vm->evicting;
> + amdgpu_vm_eviction_unlock(vm);
> + return ret;
> }
>
> /**