iommu/amd: Allocate the page table root using GFP_KERNEL

Domain allocation is always done under a sleepable context, the v1 path
and other drivers use GFP_KERNEL already. Fix the v2 path to also use
GFP_KERNEL.

Fixes: 0d571dc ("iommu/amd: Allocate page table using numa locality info")
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/2-v2-831cdc4d00f3+1a315-amd_iopgtbl_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

Author: jgunthorpe

drivers/iommu/amd/io_pgtable_v2.c

@@ -362,7 +362,7 @@ static struct io_pgtable *v2_alloc_pgtable(struct io_pgtable_cfg *cfg, void *coo
 	struct protection_domain *pdom = (struct protection_domain *)cookie;
 	int ias = IOMMU_IN_ADDR_BIT_SIZE;
 
-	pgtable->pgd = iommu_alloc_page_node(pdom->nid, GFP_ATOMIC);
+	pgtable->pgd = iommu_alloc_page_node(pdom->nid, GFP_KERNEL);
 	if (!pgtable->pgd)
 		return NULL;