x86_64: prepare shared kernel/pci-dma.c

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 346 deletions

diff --git a/arch/x86_64/kernel/pci-dma.c b/arch/x86_64/kernel/pci-dma.c
deleted file mode 100644
index 29711445c818..000000000000
--- a/arch/x86_64/kernel/pci-dma.c
+++ /dev/null
@@ -1,346 +0,0 @@
-/*
- * Dynamic DMA mapping support.
- */
-
-#include <linux/types.h>
-#include <linux/mm.h>
-#include <linux/string.h>
-#include <linux/pci.h>
-#include <linux/module.h>
-#include <asm/io.h>
-#include <asm/iommu.h>
-#include <asm/calgary.h>
-
-int iommu_merge __read_mostly = 0;
-EXPORT_SYMBOL(iommu_merge);
-
-dma_addr_t bad_dma_address __read_mostly;
-EXPORT_SYMBOL(bad_dma_address);
-
-/* This tells the BIO block layer to assume merging. Default to off
-   because we cannot guarantee merging later. */
-int iommu_bio_merge __read_mostly = 0;
-EXPORT_SYMBOL(iommu_bio_merge);
-
-static int iommu_sac_force __read_mostly = 0;
-
-int no_iommu __read_mostly;
-#ifdef CONFIG_IOMMU_DEBUG
-int panic_on_overflow __read_mostly = 1;
-int force_iommu __read_mostly = 1;
-#else
-int panic_on_overflow __read_mostly = 0;
-int force_iommu __read_mostly= 0;
-#endif
-
-/* Set this to 1 if there is a HW IOMMU in the system */
-int iommu_detected __read_mostly = 0;
-
-/* Dummy device used for NULL arguments (normally ISA). Better would
-   be probably a smaller DMA mask, but this is bug-to-bug compatible
-   to i386. */
-struct device fallback_dev = {
-	.bus_id = "fallback device",
-	.coherent_dma_mask = DMA_32BIT_MASK,
-	.dma_mask = &fallback_dev.coherent_dma_mask,
-};
-
-/* Allocate DMA memory on node near device */
-noinline static void *
-dma_alloc_pages(struct device *dev, gfp_t gfp, unsigned order)
-{
-	struct page *page;
-	int node;
-#ifdef CONFIG_PCI
-	if (dev->bus == &pci_bus_type)
-		node = pcibus_to_node(to_pci_dev(dev)->bus);
-	else
-#endif
-		node = numa_node_id();
-
-	if (node < first_node(node_online_map))
-		node = first_node(node_online_map);
-
-	page = alloc_pages_node(node, gfp, order);
-	return page ? page_address(page) : NULL;
-}
-
-/*
- * Allocate memory for a coherent mapping.
- */
-void *
-dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
-		   gfp_t gfp)
-{
-	void *memory;
-	unsigned long dma_mask = 0;
-	u64 bus;
-
-	if (!dev)
-		dev = &fallback_dev;
-	dma_mask = dev->coherent_dma_mask;
-	if (dma_mask == 0)
-		dma_mask = DMA_32BIT_MASK;
-
-	/* Device not DMA able */
-	if (dev->dma_mask == NULL)
-		return NULL;
-
-	/* Don't invoke OOM killer */
-	gfp |= __GFP_NORETRY;
-
-	/* Kludge to make it bug-to-bug compatible with i386. i386
-	   uses the normal dma_mask for alloc_coherent. */
-	dma_mask &= *dev->dma_mask;
-
-	/* Why <=? Even when the mask is smaller than 4GB it is often
-	   larger than 16MB and in this case we have a chance of
-	   finding fitting memory in the next higher zone first. If
-	   not retry with true GFP_DMA. -AK */
-	if (dma_mask <= DMA_32BIT_MASK)
-		gfp |= GFP_DMA32;
-
- again:
-	memory = dma_alloc_pages(dev, gfp, get_order(size));
-	if (memory == NULL)
-		return NULL;
-
-	{
-		int high, mmu;
-		bus = virt_to_bus(memory);
-	        high = (bus + size) >= dma_mask;
-		mmu = high;
-		if (force_iommu && !(gfp & GFP_DMA))
-			mmu = 1;
-		else if (high) {
-			free_pages((unsigned long)memory,
-				   get_order(size));
-
-			/* Don't use the 16MB ZONE_DMA unless absolutely
-			   needed. It's better to use remapping first. */
-			if (dma_mask < DMA_32BIT_MASK && !(gfp & GFP_DMA)) {
-				gfp = (gfp & ~GFP_DMA32) | GFP_DMA;
-				goto again;
-			}
-
-			/* Let low level make its own zone decisions */
-			gfp &= ~(GFP_DMA32|GFP_DMA);
-
-			if (dma_ops->alloc_coherent)
-				return dma_ops->alloc_coherent(dev, size,
-							   dma_handle, gfp);
-			return NULL;
-		}
-
-		memset(memory, 0, size);
-		if (!mmu) {
-			*dma_handle = virt_to_bus(memory);
-			return memory;
-		}
-	}
-
-	if (dma_ops->alloc_coherent) {
-		free_pages((unsigned long)memory, get_order(size));
-		gfp &= ~(GFP_DMA|GFP_DMA32);
-		return dma_ops->alloc_coherent(dev, size, dma_handle, gfp);
-	}
-
-	if (dma_ops->map_simple) {
-		*dma_handle = dma_ops->map_simple(dev, memory,
-					      size,
-					      PCI_DMA_BIDIRECTIONAL);
-		if (*dma_handle != bad_dma_address)
-			return memory;
-	}
-
-	if (panic_on_overflow)
-		panic("dma_alloc_coherent: IOMMU overflow by %lu bytes\n",size);
-	free_pages((unsigned long)memory, get_order(size));
-	return NULL;
-}
-EXPORT_SYMBOL(dma_alloc_coherent);
-
-/*
- * Unmap coherent memory.
- * The caller must ensure that the device has finished accessing the mapping.
- */
-void dma_free_coherent(struct device *dev, size_t size,
-			 void *vaddr, dma_addr_t bus)
-{
-	if (dma_ops->unmap_single)
-		dma_ops->unmap_single(dev, bus, size, 0);
-	free_pages((unsigned long)vaddr, get_order(size));
-}
-EXPORT_SYMBOL(dma_free_coherent);
-
-static int forbid_dac __read_mostly;
-
-int dma_supported(struct device *dev, u64 mask)
-{
-#ifdef CONFIG_PCI
-	if (mask > 0xffffffff && forbid_dac > 0) {
-
-
-
-		printk(KERN_INFO "PCI: Disallowing DAC for device %s\n", dev->bus_id);
-		return 0;
-	}
-#endif
-
-	if (dma_ops->dma_supported)
-		return dma_ops->dma_supported(dev, mask);
-
-	/* Copied from i386. Doesn't make much sense, because it will
-	   only work for pci_alloc_coherent.
-	   The caller just has to use GFP_DMA in this case. */
-        if (mask < DMA_24BIT_MASK)
-                return 0;
-
-	/* Tell the device to use SAC when IOMMU force is on.  This
-	   allows the driver to use cheaper accesses in some cases.
-
-	   Problem with this is that if we overflow the IOMMU area and
-	   return DAC as fallback address the device may not handle it
-	   correctly.
-
-	   As a special case some controllers have a 39bit address
-	   mode that is as efficient as 32bit (aic79xx). Don't force
-	   SAC for these.  Assume all masks <= 40 bits are of this
-	   type. Normally this doesn't make any difference, but gives
-	   more gentle handling of IOMMU overflow. */
-	if (iommu_sac_force && (mask >= DMA_40BIT_MASK)) {
-		printk(KERN_INFO "%s: Force SAC with mask %Lx\n", dev->bus_id,mask);
-		return 0;
-	}
-
-	return 1;
-}
-EXPORT_SYMBOL(dma_supported);
-
-int dma_set_mask(struct device *dev, u64 mask)
-{
-	if (!dev->dma_mask || !dma_supported(dev, mask))
-		return -EIO;
-	*dev->dma_mask = mask;
-	return 0;
-}
-EXPORT_SYMBOL(dma_set_mask);
-
-/*
- * See <Documentation/x86_64/boot-options.txt> for the iommu kernel parameter
- * documentation.
- */
-__init int iommu_setup(char *p)
-{
-	iommu_merge = 1;
-
-	if (!p)
-		return -EINVAL;
-
-	while (*p) {
-		if (!strncmp(p,"off",3))
-			no_iommu = 1;
-		/* gart_parse_options has more force support */
-		if (!strncmp(p,"force",5))
-			force_iommu = 1;
-		if (!strncmp(p,"noforce",7)) {
-			iommu_merge = 0;
-			force_iommu = 0;
-		}
-
-		if (!strncmp(p, "biomerge",8)) {
-			iommu_bio_merge = 4096;
-			iommu_merge = 1;
-			force_iommu = 1;
-		}
-		if (!strncmp(p, "panic",5))
-			panic_on_overflow = 1;
-		if (!strncmp(p, "nopanic",7))
-			panic_on_overflow = 0;
-		if (!strncmp(p, "merge",5)) {
-			iommu_merge = 1;
-			force_iommu = 1;
-		}
-		if (!strncmp(p, "nomerge",7))
-			iommu_merge = 0;
-		if (!strncmp(p, "forcesac",8))
-			iommu_sac_force = 1;
-		if (!strncmp(p, "allowdac", 8))
-			forbid_dac = 0;
-		if (!strncmp(p, "nodac", 5))
-			forbid_dac = -1;
-
-#ifdef CONFIG_SWIOTLB
-		if (!strncmp(p, "soft",4))
-			swiotlb = 1;
-#endif
-
-#ifdef CONFIG_IOMMU
-		gart_parse_options(p);
-#endif
-
-#ifdef CONFIG_CALGARY_IOMMU
-		if (!strncmp(p, "calgary", 7))
-			use_calgary = 1;
-#endif /* CONFIG_CALGARY_IOMMU */
-
-		p += strcspn(p, ",");
-		if (*p == ',')
-			++p;
-	}
-	return 0;
-}
-early_param("iommu", iommu_setup);
-
-void __init pci_iommu_alloc(void)
-{
-	/*
-	 * The order of these functions is important for
-	 * fall-back/fail-over reasons
-	 */
-#ifdef CONFIG_IOMMU
-	iommu_hole_init();
-#endif
-
-#ifdef CONFIG_CALGARY_IOMMU
-	detect_calgary();
-#endif
-
-#ifdef CONFIG_SWIOTLB
-	pci_swiotlb_init();
-#endif
-}
-
-static int __init pci_iommu_init(void)
-{
-#ifdef CONFIG_CALGARY_IOMMU
-	calgary_iommu_init();
-#endif
-
-#ifdef CONFIG_IOMMU
-	gart_iommu_init();
-#endif
-
-	no_iommu_init();
-	return 0;
-}
-
-void pci_iommu_shutdown(void)
-{
-	gart_iommu_shutdown();
-}
-
-#ifdef CONFIG_PCI
-/* Many VIA bridges seem to corrupt data for DAC. Disable it here */
-
-static __devinit void via_no_dac(struct pci_dev *dev)
-{
-	if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI && forbid_dac == 0) {
-		printk(KERN_INFO "PCI: VIA PCI bridge detected. Disabling DAC.\n");
-		forbid_dac = 1;
-	}
-}
-DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_ANY_ID, via_no_dac);
-#endif
-/* Must execute after PCI subsystem */
-fs_initcall(pci_iommu_init);