add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/s390/pci/pci_dma.c
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@@ -10,12 +10,10 @@
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 #include <linux/slab.h>
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 #include <linux/export.h>
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 #include <linux/iommu-helper.h>
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-#include <linux/dma-mapping.h>
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+#include <linux/dma-map-ops.h>
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 #include <linux/vmalloc.h>
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 #include <linux/pci.h>
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 #include <asm/pci_dma.h>
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-
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-#define S390_MAPPING_ERROR		(~(dma_addr_t) 0x0)
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 static struct kmem_cache *dma_region_table_cache;
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 static struct kmem_cache *dma_page_table_cache;
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@@ -263,13 +261,11 @@
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 				       unsigned long start, int size)
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 {
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 	struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
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-	unsigned long boundary_size;
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-	boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
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-			      PAGE_SIZE) >> PAGE_SHIFT;
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 	return iommu_area_alloc(zdev->iommu_bitmap, zdev->iommu_pages,
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 				start, size, zdev->start_dma >> PAGE_SHIFT,
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-				boundary_size, 0);
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+				dma_get_seg_boundary_nr_pages(dev, PAGE_SHIFT),
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+				0);
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 }
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 static dma_addr_t dma_alloc_address(struct device *dev, int size)
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@@ -301,7 +297,7 @@
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 out_error:
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 	spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, flags);
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-	return S390_MAPPING_ERROR;
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+	return DMA_MAPPING_ERROR;
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 }
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 static void dma_free_address(struct device *dev, dma_addr_t dma_addr, int size)
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@@ -349,7 +345,7 @@
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 	/* This rounds up number of pages based on size and offset */
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 	nr_pages = iommu_num_pages(pa, size, PAGE_SIZE);
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 	dma_addr = dma_alloc_address(dev, nr_pages);
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-	if (dma_addr == S390_MAPPING_ERROR) {
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+	if (dma_addr == DMA_MAPPING_ERROR) {
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 		ret = -ENOSPC;
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 		goto out_err;
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 	}
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@@ -372,7 +368,7 @@
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 out_err:
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 	zpci_err("map error:\n");
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 	zpci_err_dma(ret, pa);
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-	return S390_MAPPING_ERROR;
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+	return DMA_MAPPING_ERROR;
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 }
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 static void s390_dma_unmap_pages(struct device *dev, dma_addr_t dma_addr,
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@@ -406,7 +402,7 @@
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 	dma_addr_t map;
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 	size = PAGE_ALIGN(size);
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-	page = alloc_pages(flag, get_order(size));
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+	page = alloc_pages(flag | __GFP_ZERO, get_order(size));
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 	if (!page)
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 		return NULL;
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@@ -449,7 +445,7 @@
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 	int ret;
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 	dma_addr_base = dma_alloc_address(dev, nr_pages);
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-	if (dma_addr_base == S390_MAPPING_ERROR)
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+	if (dma_addr_base == DMA_MAPPING_ERROR)
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 		return -ENOMEM;
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 	dma_addr = dma_addr_base;
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@@ -496,7 +492,7 @@
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 	for (i = 1; i < nr_elements; i++) {
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 		s = sg_next(s);
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-		s->dma_address = S390_MAPPING_ERROR;
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+		s->dma_address = DMA_MAPPING_ERROR;
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 		s->dma_length = 0;
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 		if (s->offset || (size & ~PAGE_MASK) ||
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@@ -546,11 +542,6 @@
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 	}
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 }
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-static int s390_mapping_error(struct device *dev, dma_addr_t dma_addr)
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-{
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-	return dma_addr == S390_MAPPING_ERROR;
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-}
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-
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 int zpci_dma_init_device(struct zpci_dev *zdev)
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 {
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 	int rc;
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@@ -675,16 +666,19 @@
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 	.unmap_sg	= s390_dma_unmap_sg,
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 	.map_page	= s390_dma_map_pages,
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 	.unmap_page	= s390_dma_unmap_pages,
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-	.mapping_error	= s390_mapping_error,
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+	.mmap		= dma_common_mmap,
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+	.get_sgtable	= dma_common_get_sgtable,
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+	.alloc_pages	= dma_common_alloc_pages,
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+	.free_pages	= dma_common_free_pages,
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 	/* dma_supported is unconditionally true without a callback */
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 };
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 EXPORT_SYMBOL_GPL(s390_pci_dma_ops);
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 static int __init s390_iommu_setup(char *str)
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 {
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-	if (!strncmp(str, "strict", 6))
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+	if (!strcmp(str, "strict"))
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 		s390_iommu_strict = 1;
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-	return 0;
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+	return 1;
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 }
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 __setup("s390_iommu=", s390_iommu_setup);