[PATCH v1 05/14] drm/amdkfd: ref count init for device pages
Felix Kuehling
felix.kuehling at amd.com
Wed Aug 25 14:34:20 UTC 2021
Am 2021-08-24 um 11:48 p.m. schrieb Alex Sierra:
> Ref counter from device pages is init to zero during memmap init zone.
> The first time a new device page is allocated to migrate data into it,
> its ref counter needs to be initialized to one.
>
> Signed-off-by: Alex Sierra <alex.sierra at amd.com>
> ---
> drivers/gpu/drm/amd/amdkfd/kfd_migrate.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
> index dab290a4d19d..47ee9a895cd2 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
> @@ -220,7 +220,7 @@ svm_migrate_get_vram_page(struct svm_range *prange, unsigned long pfn)
> page = pfn_to_page(pfn);
> svm_range_bo_ref(prange->svm_bo);
> page->zone_device_data = prange->svm_bo;
> - get_page(page);
There is an assumption here that the page refcount is 0 because the page
should be unused. I'd add a VM_BUG_ON_PAGE(page_ref_count(page), page)
here to check that assumption.
Regards,
Felix
> + init_page_count(page);
> lock_page(page);
> }
>
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