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

Convert iommu/rockchip-iommu.c to use the new page allocation functions
provided in iommu-pages.h.
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Acked-by: David Rientjes <rientjes@google.com>
Tested-by: Bagas Sanjaya <bagasdotme@gmail.com>
Link: https://lore.kernel.org/r/20240413002522.1101315-8-pasha.tatashin@soleen.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/rockchip-iommu.c

@@ -26,6 +26,8 @@
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 
+#include "iommu-pages.h"
+
 /** MMU register offsets */
 #define RK_MMU_DTE_ADDR		0x00	/* Directory table address */
 #define RK_MMU_STATUS		0x04
@@ -727,14 +729,14 @@ static u32 *rk_dte_get_page_table(struct rk_iommu_domain *rk_domain,
 	if (rk_dte_is_pt_valid(dte))
 		goto done;
 
-	page_table = (u32 *)get_zeroed_page(GFP_ATOMIC | rk_ops->gfp_flags);
+	page_table = iommu_alloc_page(GFP_ATOMIC | rk_ops->gfp_flags);
 	if (!page_table)
 		return ERR_PTR(-ENOMEM);
 
 	pt_dma = dma_map_single(dma_dev, page_table, SPAGE_SIZE, DMA_TO_DEVICE);
 	if (dma_mapping_error(dma_dev, pt_dma)) {
 		dev_err(dma_dev, "DMA mapping error while allocating page table\n");
-		free_page((unsigned long)page_table);
+		iommu_free_page(page_table);
 		return ERR_PTR(-ENOMEM);
 	}
 
@@ -1061,7 +1063,7 @@ static struct iommu_domain *rk_iommu_domain_alloc_paging(struct device *dev)
 	 * Each level1 (dt) and level2 (pt) table has 1024 4-byte entries.
 	 * Allocate one 4 KiB page for each table.
 	 */
-	rk_domain->dt = (u32 *)get_zeroed_page(GFP_KERNEL | rk_ops->gfp_flags);
+	rk_domain->dt = iommu_alloc_page(GFP_KERNEL | rk_ops->gfp_flags);
 	if (!rk_domain->dt)
 		goto err_free_domain;
 
@@ -1083,7 +1085,7 @@ static struct iommu_domain *rk_iommu_domain_alloc_paging(struct device *dev)
 	return &rk_domain->domain;
 
 err_free_dt:
-	free_page((unsigned long)rk_domain->dt);
+	iommu_free_page(rk_domain->dt);
 err_free_domain:
 	kfree(rk_domain);
 
@@ -1104,13 +1106,13 @@ static void rk_iommu_domain_free(struct iommu_domain *domain)
 			u32 *page_table = phys_to_virt(pt_phys);
 			dma_unmap_single(dma_dev, pt_phys,
 					 SPAGE_SIZE, DMA_TO_DEVICE);
-			free_page((unsigned long)page_table);
+			iommu_free_page(page_table);
 		}
 	}
 
 	dma_unmap_single(dma_dev, rk_domain->dt_dma,
 			 SPAGE_SIZE, DMA_TO_DEVICE);
-	free_page((unsigned long)rk_domain->dt);
+	iommu_free_page(rk_domain->dt);
 
 	kfree(rk_domain);
 }