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Subject[PATCH 18 of 38] x86: unify pci iommu setup and allow swiotlb to compile for 32 bit
Date
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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>
---
arch/x86/include/asm/dma-mapping.h | 6 +-----
arch/x86/include/asm/pci.h | 2 ++
arch/x86/include/asm/pci_64.h | 1 -
arch/x86/kernel/Makefile | 3 ++-
arch/x86/kernel/pci-dma.c | 6 ++++--
arch/x86/kernel/pci-swiotlb_64.c | 2 ++
arch/x86/mm/init_32.c | 3 +++
7 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h
@@ -66,21 +66,17 @@
return dma_ops;
else
return dev->archdata.dma_ops;
-#endif /* _ASM_X86_DMA_MAPPING_H */
+#endif
}

/* Make sure we keep the same behaviour */
static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
-#ifdef CONFIG_X86_32
- return 0;
-#else
struct dma_mapping_ops *ops = get_dma_ops(dev);
if (ops->mapping_error)
return ops->mapping_error(dev, dma_addr);

return (dma_addr == bad_dma_address);
-#endif
}

#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
--- a/arch/x86/include/asm/pci.h
+++ b/arch/x86/include/asm/pci.h
@@ -84,6 +84,8 @@
static inline void early_quirks(void) { }
#endif

+extern void pci_iommu_alloc(void);
+
#endif /* __KERNEL__ */

#ifdef CONFIG_X86_32
diff --git a/arch/x86/include/asm/pci_64.h b/arch/x86/include/asm/pci_64.h
--- a/arch/x86/include/asm/pci_64.h
+++ b/arch/x86/include/asm/pci_64.h
@@ -23,7 +23,6 @@
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
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -115,6 +115,8 @@

obj-$(CONFIG_X86_CHECK_BIOS_CORRUPTION) += check.o

+obj-$(CONFIG_SWIOTLB) += pci-swiotlb_64.o # NB rename without _64
+
###
# 64 bit specific files
ifeq ($(CONFIG_X86_64),y)
@@ -128,7 +130,6 @@
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
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -105,11 +105,15 @@
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 @@
pci_swiotlb_init();
}

-#endif
-
void *dma_generic_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_addr, gfp_t flag)
{
diff --git a/arch/x86/kernel/pci-swiotlb_64.c b/arch/x86/kernel/pci-swiotlb_64.c
--- a/arch/x86/kernel/pci-swiotlb_64.c
+++ b/arch/x86/kernel/pci-swiotlb_64.c
@@ -62,8 +62,10 @@
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) {
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -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 @@
int codesize, reservedpages, datasize, initsize;
int tmp;

+ pci_iommu_alloc();
+
#ifdef CONFIG_FLATMEM
BUG_ON(!mem_map);
#endif



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