Re: [PATCH] drm/amdkfd: enable heavy-weight TLB flush on Arcturus

[Felix Kuehling <felix.kuehling@amd.com>]

Am 2022-01-18 um 5:45 p.m. schrieb Eric Huang:
> SDMA FW fixes the hang issue for adding heavy-weight TLB
> flush on Arcturus, so we can enable it.
>
> Signed-off-by: Eric Huang <jinhuieric.huang@amd.com>

Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>


> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c |  6 ------
>  drivers/gpu/drm/amd/amdkfd/kfd_chardev.c         | 10 ++++++++--
>  2 files changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> index a64cbbd943ba..acb4fd973e60 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> @@ -1892,12 +1892,6 @@ int amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
>  				true);
>  	ret = unreserve_bo_and_vms(&ctx, false, false);
>  
> -	/* Only apply no TLB flush on Aldebaran to
> -	 * workaround regressions on other Asics.
> -	 */
> -	if (table_freed && (adev->asic_type != CHIP_ALDEBARAN))
> -		*table_freed = true;
> -
>  	goto out;
>  
>  out_unreserve:
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> index b570c0454ce9..485d4c52c7de 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> @@ -1596,6 +1596,12 @@ static int kfd_ioctl_free_memory_of_gpu(struct file *filep,
>  	return ret;
>  }
>  
> +static bool kfd_flush_tlb_after_unmap(struct kfd_dev *dev) {
> +	return KFD_GC_VERSION(dev) == IP_VERSION(9, 4, 2) ||
> +	       (KFD_GC_VERSION(dev) == IP_VERSION(9, 4, 1) &&
> +	        dev->adev->sdma.instance[0].fw_version >= 18);
> +}
> +
>  static int kfd_ioctl_map_memory_to_gpu(struct file *filep,
>  					struct kfd_process *p, void *data)
>  {
> @@ -1692,7 +1698,7 @@ static int kfd_ioctl_map_memory_to_gpu(struct file *filep,
>  	}
>  
>  	/* Flush TLBs after waiting for the page table updates to complete */
> -	if (table_freed) {
> +	if (table_freed || !kfd_flush_tlb_after_unmap(dev)) {
>  		for (i = 0; i < args->n_devices; i++) {
>  			peer = kfd_device_by_id(devices_arr[i]);
>  			if (WARN_ON_ONCE(!peer))
> @@ -1806,7 +1812,7 @@ static int kfd_ioctl_unmap_memory_from_gpu(struct file *filep,
>  	}
>  	mutex_unlock(&p->mutex);
>  
> -	if (KFD_GC_VERSION(dev) == IP_VERSION(9, 4, 2)) {
> +	if (kfd_flush_tlb_after_unmap(dev)) {
>  		err = amdgpu_amdkfd_gpuvm_sync_memory(dev->adev,
>  				(struct kgd_mem *) mem, true);
>  		if (err) {