iommu/exynos: use page allocation function provided by iommu-pages.h

Convert iommu/exynos-iommu.c to use the new page allocation functions
provided in iommu-pages.h.

Signed-off-by: Pasha Tatashin <[e-mail]>
Acked-by: David Rientjes <[e-mail]>
Acked-by: Marek Szyprowski <[e-mail]>
Tested-by: Bagas Sanjaya <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Joerg Roedel <[e-mail]>

drivers/iommu/exynos-iommu.c

···
 #include <linux/pm_runtime.h>
 #include <linux/slab.h>
 
+#include "iommu-pages.h"
+
 typedef u32 sysmmu_iova_t;
 typedef u32 sysmmu_pte_t;
 static struct iommu_domain exynos_identity_domain;
···
 	if (!domain)
 		return NULL;
 
-	domain->pgtable = (sysmmu_pte_t *)__get_free_pages(GFP_KERNEL, 2);
+	domain->pgtable = iommu_alloc_pages(GFP_KERNEL, 2);
 	if (!domain->pgtable)
 		goto err_pgtable;
 
-	domain->lv2entcnt = (short *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 1);
+	domain->lv2entcnt = iommu_alloc_pages(GFP_KERNEL, 1);
 	if (!domain->lv2entcnt)
 		goto err_counter;
 
···
 	return &domain->domain;
 
 err_lv2ent:
-	free_pages((unsigned long)domain->lv2entcnt, 1);
+	iommu_free_pages(domain->lv2entcnt, 1);
 err_counter:
-	free_pages((unsigned long)domain->pgtable, 2);
+	iommu_free_pages(domain->pgtable, 2);
 err_pgtable:
 	kfree(domain);
 	return NULL;
···
 					phys_to_virt(base));
 		}
 
-	free_pages((unsigned long)domain->pgtable, 2);
-	free_pages((unsigned long)domain->lv2entcnt, 1);
+	iommu_free_pages(domain->pgtable, 2);
+	iommu_free_pages(domain->lv2entcnt, 1);
 	kfree(domain);
 }