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Diffstat (limited to 'arch/x86_64/kernel/pci-dma.c')
-rw-r--r--arch/x86_64/kernel/pci-dma.c269
1 files changed, 0 insertions, 269 deletions
diff --git a/arch/x86_64/kernel/pci-dma.c b/arch/x86_64/kernel/pci-dma.c
deleted file mode 100644
index 4ed391edd47..00000000000
--- a/arch/x86_64/kernel/pci-dma.c
+++ /dev/null
@@ -1,269 +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/proto.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);
-
-int iommu_sac_force __read_mostly = 0;
-EXPORT_SYMBOL(iommu_sac_force);
-
-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
-
-/* 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 = 0xffffffff,
- .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;
- if (dev->bus == &pci_bus_type)
- node = pcibus_to_node(to_pci_dev(dev)->bus);
- else
- node = numa_node_id();
- 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 = 0xffffffff;
-
- /* 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 <= 0xffffffff)
- 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 < 0xffffffff && !(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);
-
-int dma_supported(struct device *dev, u64 mask)
-{
- 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 < 0x00ffffff)
- 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 >= 0xffffffffffULL)) {
- 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);
-
-/* iommu=[size][,noagp][,off][,force][,noforce][,leak][,memaper[=order]][,merge]
- [,forcesac][,fullflush][,nomerge][,biomerge]
- size set size of iommu (in bytes)
- noagp don't initialize the AGP driver and use full aperture.
- off don't use the IOMMU
- leak turn on simple iommu leak tracing (only when CONFIG_IOMMU_LEAK is on)
- memaper[=order] allocate an own aperture over RAM with size 32MB^order.
- noforce don't force IOMMU usage. Default.
- force Force IOMMU.
- merge Do lazy merging. This may improve performance on some block devices.
- Implies force (experimental)
- biomerge Do merging at the BIO layer. This is more efficient than merge,
- but should be only done with very big IOMMUs. Implies merge,force.
- nomerge Don't do SG merging.
- forcesac For SAC mode for masks <40bits (experimental)
- fullflush Flush IOMMU on each allocation (default)
- nofullflush Don't use IOMMU fullflush
- allowed overwrite iommu off workarounds for specific chipsets.
- soft Use software bounce buffering (default for Intel machines)
- noaperture Don't touch the aperture for AGP.
-*/
-__init int iommu_setup(char *p)
-{
- iommu_merge = 1;
-
- 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;
-
-#ifdef CONFIG_SWIOTLB
- if (!strncmp(p, "soft",4))
- swiotlb = 1;
-#endif
-
-#ifdef CONFIG_GART_IOMMU
- gart_parse_options(p);
-#endif
-
- p += strcspn(p, ",");
- if (*p == ',')
- ++p;
- }
- return 1;
-}
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