iommu/io-pgtable-dart: use page allocation function provided by iommu-pages.h

Convert iommu/io-pgtable-dart.c to use the new page allocation functions
provided in iommu-pages.h., and remove unnecessary struct io_pgtable_cfg
argument from __dart_alloc_pages().

Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Janne Grunau <j@jannau.net>
Acked-by: David Rientjes <rientjes@google.com>
Tested-by: Bagas Sanjaya <bagasdotme@gmail.com>
Link: https://lore.kernel.org/r/20240413002522.1101315-6-pasha.tatashin@soleen.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

Author: soleen

drivers/iommu/io-pgtable-dart.c

@@ -23,6 +23,7 @@
 #include <linux/types.h>
 
 #include <asm/barrier.h>
+#include "iommu-pages.h"
 
 #define DART1_MAX_ADDR_BITS	36
 
@@ -106,18 +107,12 @@ static phys_addr_t iopte_to_paddr(dart_iopte pte,
 	return paddr;
 }
 
-static void *__dart_alloc_pages(size_t size, gfp_t gfp,
-				    struct io_pgtable_cfg *cfg)
+static void *__dart_alloc_pages(size_t size, gfp_t gfp)
 {
 	int order = get_order(size);
-	struct page *p;
 
 	VM_BUG_ON((gfp & __GFP_HIGHMEM));
-	p = alloc_pages(gfp | __GFP_ZERO, order);
-	if (!p)
-		return NULL;
-
-	return page_address(p);
+	return iommu_alloc_pages(gfp, order);
 }
 
 static int dart_init_pte(struct dart_io_pgtable *data,
@@ -262,13 +257,13 @@ static int dart_map_pages(struct io_pgtable_ops *ops, unsigned long iova,
 
 	/* no L2 table present */
 	if (!pte) {
-		cptep = __dart_alloc_pages(tblsz, gfp, cfg);
+		cptep = __dart_alloc_pages(tblsz, gfp);
 		if (!cptep)
 			return -ENOMEM;
 
 		pte = dart_install_table(cptep, ptep, 0, data);
 		if (pte)
-			free_pages((unsigned long)cptep, get_order(tblsz));
+			iommu_free_pages(cptep, get_order(tblsz));
 
 		/* L2 table is present (now) */
 		pte = READ_ONCE(*ptep);
@@ -419,8 +414,7 @@ apple_dart_alloc_pgtable(struct io_pgtable_cfg *cfg, void *cookie)
 	cfg->apple_dart_cfg.n_ttbrs = 1 << data->tbl_bits;
 
 	for (i = 0; i < cfg->apple_dart_cfg.n_ttbrs; ++i) {
-		data->pgd[i] = __dart_alloc_pages(DART_GRANULE(data), GFP_KERNEL,
-					   cfg);
+		data->pgd[i] = __dart_alloc_pages(DART_GRANULE(data), GFP_KERNEL);
 		if (!data->pgd[i])
 			goto out_free_data;
 		cfg->apple_dart_cfg.ttbr[i] = virt_to_phys(data->pgd[i]);
@@ -429,16 +423,18 @@ apple_dart_alloc_pgtable(struct io_pgtable_cfg *cfg, void *cookie)
 	return &data->iop;
 
 out_free_data:
-	while (--i >= 0)
-		free_pages((unsigned long)data->pgd[i],
-			   get_order(DART_GRANULE(data)));
+	while (--i >= 0) {
+		iommu_free_pages(data->pgd[i],
+				 get_order(DART_GRANULE(data)));
+	}
 	kfree(data);
 	return NULL;
 }
 
 static void apple_dart_free_pgtable(struct io_pgtable *iop)
 {
 	struct dart_io_pgtable *data = io_pgtable_to_data(iop);
+	int order = get_order(DART_GRANULE(data));
 	dart_iopte *ptep, *end;
 	int i;
 
@@ -449,15 +445,10 @@ static void apple_dart_free_pgtable(struct io_pgtable *iop)
 		while (ptep != end) {
 			dart_iopte pte = *ptep++;
 
-			if (pte) {
-				unsigned long page =
-					(unsigned long)iopte_deref(pte, data);
-
-				free_pages(page, get_order(DART_GRANULE(data)));
-			}
+			if (pte)
+				iommu_free_pages(iopte_deref(pte, data), order);
 		}
-		free_pages((unsigned long)data->pgd[i],
-			   get_order(DART_GRANULE(data)));
+		iommu_free_pages(data->pgd[i], order);
 	}
 
 	kfree(data);