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

[Russell, Kent]

One question inline


KENT RUSSELL
Sr. Software Engineer | Linux Compute Kernel
1 Commerce Valley Drive East
Markham, ON L3T 7X6
O +(1) 289-695-2122 | Ext 72122

________________________________
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Felix Kuehling <felix.kuehling at amd.com>
Sent: Tuesday, January 18, 2022 6:36 PM
To: Huang, JinHuiEric <JinHuiEric.Huang at amd.com>; amd-gfx at lists.freedesktop.org <amd-gfx at lists.freedesktop.org>
Subject: Re: [PATCH] drm/amdkfd: enable heavy-weight TLB flush on Arcturus

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 at amd.com>

Reviewed-by: Felix Kuehling <Felix.Kuehling at 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)

Do we need to add a check for sdma ver >=8 here?

||
> +            (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) {
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