add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/x86/kernel/pci-dma.c
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@@ -1,9 +1,10 @@
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 // SPDX-License-Identifier: GPL-2.0
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+#include <linux/dma-map-ops.h>
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 #include <linux/dma-direct.h>
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-#include <linux/dma-debug.h>
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+#include <linux/iommu.h>
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 #include <linux/dmar.h>
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 #include <linux/export.h>
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-#include <linux/bootmem.h>
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+#include <linux/memblock.h>
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 #include <linux/gfp.h>
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 #include <linux/pci.h>
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@@ -11,13 +12,12 @@
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 #include <asm/dma.h>
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 #include <asm/iommu.h>
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 #include <asm/gart.h>
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-#include <asm/calgary.h>
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 #include <asm/x86_init.h>
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 #include <asm/iommu_table.h>
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 static bool disable_dac_quirk __read_mostly;
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-const struct dma_map_ops *dma_ops = &dma_direct_ops;
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+const struct dma_map_ops *dma_ops;
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 EXPORT_SYMBOL(dma_ops);
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 #ifdef CONFIG_IOMMU_DEBUG
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@@ -34,30 +34,7 @@
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 /* Set this to 1 if there is a HW IOMMU in the system */
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 int iommu_detected __read_mostly = 0;
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-/*
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- * This variable becomes 1 if iommu=pt is passed on the kernel command line.
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- * If this variable is 1, IOMMU implementations do no DMA translation for
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- * devices and allow every device to access to whole physical memory. This is
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- * useful if a user wants to use an IOMMU only for KVM device assignment to
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- * guests and not for driver dma translation.
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- * It is also possible to disable by default in kernel config, and enable with
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- * iommu=nopt at boot time.
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- */
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-#ifdef CONFIG_IOMMU_DEFAULT_PASSTHROUGH
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-int iommu_pass_through __read_mostly = 1;
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-#else
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-int iommu_pass_through __read_mostly;
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-#endif
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-
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 extern struct iommu_table_entry __iommu_table[], __iommu_table_end[];
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-
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-/* Dummy device used for NULL arguments (normally ISA). */
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-struct device x86_dma_fallback_dev = {
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-	.init_name = "fallback device",
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-	.coherent_dma_mask = ISA_DMA_BIT_MASK,
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-	.dma_mask = &x86_dma_fallback_dev.coherent_dma_mask,
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-};
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-EXPORT_SYMBOL(x86_dma_fallback_dev);
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 void __init pci_iommu_alloc(void)
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 {
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@@ -77,20 +54,8 @@
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 	}
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 }
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-bool arch_dma_alloc_attrs(struct device **dev)
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-{
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-	if (!*dev)
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-		*dev = &x86_dma_fallback_dev;
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-
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-	if (!is_device_dma_capable(*dev))
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-		return false;
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-	return true;
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-
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-}
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-EXPORT_SYMBOL(arch_dma_alloc_attrs);
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-
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 /*
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- * See <Documentation/x86/x86_64/boot-options.txt> for the iommu kernel
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+ * See <Documentation/x86/x86_64/boot-options.rst> for the iommu kernel
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  * parameter documentation.
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  */
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 static __init int iommu_setup(char *p)
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@@ -140,16 +105,11 @@
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 			swiotlb = 1;
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 #endif
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 		if (!strncmp(p, "pt", 2))
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-			iommu_pass_through = 1;
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+			iommu_set_default_passthrough(true);
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 		if (!strncmp(p, "nopt", 4))
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-			iommu_pass_through = 0;
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+			iommu_set_default_translated(true);
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 		gart_parse_options(p);
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-
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-#ifdef CONFIG_CALGARY_IOMMU
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-		if (!strncmp(p, "calgary", 7))
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-			use_calgary = 1;
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-#endif /* CONFIG_CALGARY_IOMMU */
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 		p += strcspn(p, ",");
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 		if (*p == ',')
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@@ -180,7 +140,7 @@
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 static int via_no_dac_cb(struct pci_dev *pdev, void *data)
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 {
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-	pdev->dev.bus_dma_mask = DMA_BIT_MASK(32);
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+	pdev->dev.bus_dma_limit = DMA_BIT_MASK(32);
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 	return 0;
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 }
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