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x86: unify pci iommu setup and allow swiotlb to compile for 32 bit

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swiotlb on 32 bit will be used by Xen domain 0 support.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge 2008-12-16 12:17:36 -08:00 committed by Ingo Molnar
parent 8ce7996009
commit cfb80c9eae
7 changed files with 14 additions and 5 deletions
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2
arch/x86/include/asm/dma-mapping.h
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@ -65,7 +65,7 @@ static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
return dma_ops;
else
return dev->archdata.dma_ops;
#endif /* _ASM_X86_DMA_MAPPING_H */
#endif
}
/* Make sure we keep the same behaviour */

2
arch/x86/include/asm/pci.h
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@ -82,6 +82,8 @@ static inline void pci_dma_burst_advice(struct pci_dev *pdev,
static inline void early_quirks(void) { }
#endif
extern void pci_iommu_alloc(void);
#endif /* __KERNEL__ */
#ifdef CONFIG_X86_32

1
arch/x86/include/asm/pci_64.h
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@ -23,7 +23,6 @@ extern int (*pci_config_write)(int seg, int bus, int dev, int fn,
int reg, int len, u32 value);
extern void dma32_reserve_bootmem(void);
extern void pci_iommu_alloc(void);
/* The PCI address space does equal the physical memory
* address space. The networking and block device layers use

3
arch/x86/kernel/Makefile
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@ -105,6 +105,8 @@ microcode-$(CONFIG_MICROCODE_INTEL) += microcode_intel.o
microcode-$(CONFIG_MICROCODE_AMD) += microcode_amd.o
obj-$(CONFIG_MICROCODE) += microcode.o
obj-$(CONFIG_SWIOTLB) += pci-swiotlb_64.o # NB rename without _64
###
# 64 bit specific files
ifeq ($(CONFIG_X86_64),y)
@ -118,7 +120,6 @@ ifeq ($(CONFIG_X86_64),y)
obj-$(CONFIG_GART_IOMMU) += pci-gart_64.o aperture_64.o
obj-$(CONFIG_CALGARY_IOMMU) += pci-calgary_64.o tce_64.o
obj-$(CONFIG_AMD_IOMMU) += amd_iommu_init.o amd_iommu.o
obj-$(CONFIG_SWIOTLB) += pci-swiotlb_64.o
obj-$(CONFIG_PCI_MMCONFIG) += mmconf-fam10h_64.o
endif

6
arch/x86/kernel/pci-dma.c
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@ -105,11 +105,15 @@ static void __init dma32_free_bootmem(void)
dma32_bootmem_ptr = NULL;
dma32_bootmem_size = 0;
}
#endif
void __init pci_iommu_alloc(void)
{
#ifdef CONFIG_X86_64
/* free the range so iommu could get some range less than 4G */
dma32_free_bootmem();
#endif
/*
* The order of these functions is important for
* fall-back/fail-over reasons
@ -125,8 +129,6 @@ void __init pci_iommu_alloc(void)
pci_swiotlb_init();
}
#endif
void *dma_generic_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_addr, gfp_t flag)
{

2
arch/x86/kernel/pci-swiotlb_64.c
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@ -62,8 +62,10 @@ struct dma_mapping_ops swiotlb_dma_ops = {
void __init pci_swiotlb_init(void)
{
/* don't initialize swiotlb if iommu=off (no_iommu=1) */
#ifdef CONFIG_X86_64
if (!iommu_detected && !no_iommu && max_pfn > MAX_DMA32_PFN)
swiotlb = 1;
#endif
if (swiotlb_force)
swiotlb = 1;
if (swiotlb) {

3
arch/x86/mm/init_32.c
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@ -21,6 +21,7 @@
#include <linux/init.h>
#include <linux/highmem.h>
#include <linux/pagemap.h>
#include <linux/pci.h>
#include <linux/pfn.h>
#include <linux/poison.h>
#include <linux/bootmem.h>
@ -971,6 +972,8 @@ void __init mem_init(void)
start_periodic_check_for_corruption();
pci_iommu_alloc();
#ifdef CONFIG_FLATMEM
BUG_ON(!mem_map);
#endif