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authorBjorn Helgaas <bhelgaas@google.com>2017-04-28 10:34:34 -0500
committerBjorn Helgaas <bhelgaas@google.com>2017-04-28 10:34:34 -0500
commit889e4dd916a1f4dc7f9e6220fed26d811e39ca71 (patch)
treeec3905e25ae15a064a51ec74c00443a5474f223f
parent78f098383a7abb1eb9dfd45346773fe80a65f05a (diff)
parentd9c102de2caa733c3e718e1b032cd154a9994326 (diff)
Merge branch 'pci/resource-mmap' into next
* pci/resource-mmap: ia64: Use generic pci_mmap_resource_range() ia64: Remove redundant checks for WC in pci_mmap_page_range() ia64: Remove redundant valid_mmap_phys_addr_range() from pci_mmap_page_range() PCI: Add I/O BAR support to generic pci_mmap_resource_range() x86/PCI: Use generic pci_mmap_resource_range() unicore32/PCI: Use generic pci_mmap_resource_range() sh/PCI: Use generic pci_mmap_resource_range() parisc: Use generic pci_mmap_resource_range() mn10300/PCI: Use generic pci_mmap_resource_range() MIPS: PCI: Use generic pci_mmap_resource_range() cris/PCI: Use generic pci_mmap_resource_range() ARM/PCI: Use generic pci_mmap_resource_range() PCI: Add pci_mmap_resource_range() and use it for ARM64 PCI: Add BAR index argument to pci_mmap_page_range() PCI: Use BAR index in sysfs attr->private instead of resource pointer PCI: Add arch_can_pci_mmap_io() on architectures which can mmap() I/O space PCI: Move multiple declarations of pci_mmap_page_range() to <linux/pci.h> PCI: Add arch_can_pci_mmap_wc() macro xtensa/PCI: Do not mmap PCI BARs to userspace as write-through PCI: Only allow WC mmap on prefetchable resources PCI: Fix another sanity check bug in /proc/pci mmap PCI: Fix pci_mmap_fits() for HAVE_PCI_RESOURCE_TO_USER platforms
-rw-r--r--Documentation/filesystems/sysfs-pci.txt15
-rw-r--r--arch/arm/include/asm/pci.h3
-rw-r--r--arch/arm/kernel/bios32.c19
-rw-r--r--arch/arm64/include/asm/pci.h2
-rw-r--r--arch/cris/arch-v32/drivers/pci/bios.c22
-rw-r--r--arch/cris/include/asm/pci.h4
-rw-r--r--arch/ia64/include/asm/pci.h5
-rw-r--r--arch/ia64/pci/pci.c46
-rw-r--r--arch/microblaze/include/asm/pci.h6
-rw-r--r--arch/microblaze/pci/pci-common.c2
-rw-r--r--arch/mips/include/asm/pci.h5
-rw-r--r--arch/mips/pci/pci.c24
-rw-r--r--arch/mn10300/include/asm/pci.h4
-rw-r--r--arch/mn10300/unit-asb2305/pci-asb2305.c23
-rw-r--r--arch/parisc/include/asm/pci.h4
-rw-r--r--arch/parisc/kernel/pci.c28
-rw-r--r--arch/powerpc/include/asm/pci.h9
-rw-r--r--arch/powerpc/kernel/pci-common.c3
-rw-r--r--arch/sh/drivers/pci/pci.c21
-rw-r--r--arch/sh/include/asm/pci.h4
-rw-r--r--arch/sparc/include/asm/pci_64.h5
-rw-r--r--arch/sparc/kernel/pci.c6
-rw-r--r--arch/unicore32/include/asm/pci.h3
-rw-r--r--arch/unicore32/kernel/pci.c23
-rw-r--r--arch/x86/include/asm/pci.h7
-rw-r--r--arch/x86/pci/i386.c47
-rw-r--r--arch/xtensa/include/asm/pci.h7
-rw-r--r--arch/xtensa/kernel/pci.c24
-rw-r--r--drivers/pci/Makefile2
-rw-r--r--drivers/pci/mmap.c99
-rw-r--r--drivers/pci/pci-sysfs.c76
-rw-r--r--drivers/pci/pci.h4
-rw-r--r--drivers/pci/proc.c41
-rw-r--r--include/linux/pci.h30
34 files changed, 238 insertions, 385 deletions
diff --git a/Documentation/filesystems/sysfs-pci.txt b/Documentation/filesystems/sysfs-pci.txt
index 6ea1ceda6f52..06f1d64c6f70 100644
--- a/Documentation/filesystems/sysfs-pci.txt
+++ b/Documentation/filesystems/sysfs-pci.txt
@@ -113,9 +113,18 @@ Supporting PCI access on new platforms
--------------------------------------
In order to support PCI resource mapping as described above, Linux platform
-code must define HAVE_PCI_MMAP and provide a pci_mmap_page_range function.
-Platforms are free to only support subsets of the mmap functionality, but
-useful return codes should be provided.
+code should ideally define ARCH_GENERIC_PCI_MMAP_RESOURCE and use the generic
+implementation of that functionality. To support the historical interface of
+mmap() through files in /proc/bus/pci, platforms may also set HAVE_PCI_MMAP.
+
+Alternatively, platforms which set HAVE_PCI_MMAP may provide their own
+implementation of pci_mmap_page_range() instead of defining
+ARCH_GENERIC_PCI_MMAP_RESOURCE.
+
+Platforms which support write-combining maps of PCI resources must define
+arch_can_pci_mmap_wc() which shall evaluate to non-zero at runtime when
+write-combining is permitted. Platforms which support maps of I/O resources
+define arch_can_pci_mmap_io() similarly.
Legacy resources are protected by the HAVE_PCI_LEGACY define. Platforms
wishing to support legacy functionality should define it and provide
diff --git a/arch/arm/include/asm/pci.h b/arch/arm/include/asm/pci.h
index 057d381f4e57..396c92bcc0cf 100644
--- a/arch/arm/include/asm/pci.h
+++ b/arch/arm/include/asm/pci.h
@@ -29,8 +29,7 @@ static inline int pci_proc_domain(struct pci_bus *bus)
#define PCI_DMA_BUS_IS_PHYS (1)
#define HAVE_PCI_MMAP
-extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state, int write_combine);
+#define ARCH_GENERIC_PCI_MMAP_RESOURCE
static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
{
diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c
index 2f0e07735d1d..b259956365a0 100644
--- a/arch/arm/kernel/bios32.c
+++ b/arch/arm/kernel/bios32.c
@@ -597,25 +597,6 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
return start;
}
-int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state, int write_combine)
-{
- if (mmap_state == pci_mmap_io)
- return -EINVAL;
-
- /*
- * Mark this as IO
- */
- vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
-
- if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
- vma->vm_end - vma->vm_start,
- vma->vm_page_prot))
- return -EAGAIN;
-
- return 0;
-}
-
void __init pci_map_io_early(unsigned long pfn)
{
struct map_desc pci_io_desc = {
diff --git a/arch/arm64/include/asm/pci.h b/arch/arm64/include/asm/pci.h
index b9a7ba9ca44c..1fc19744ffe9 100644
--- a/arch/arm64/include/asm/pci.h
+++ b/arch/arm64/include/asm/pci.h
@@ -22,6 +22,8 @@
*/
#define PCI_DMA_BUS_IS_PHYS (0)
+#define ARCH_GENERIC_PCI_MMAP_RESOURCE 1
+
extern int isa_dma_bridge_buggy;
#ifdef CONFIG_PCI
diff --git a/arch/cris/arch-v32/drivers/pci/bios.c b/arch/cris/arch-v32/drivers/pci/bios.c
index 212266a2c5d9..394c2a73d5e2 100644
--- a/arch/cris/arch-v32/drivers/pci/bios.c
+++ b/arch/cris/arch-v32/drivers/pci/bios.c
@@ -14,28 +14,6 @@ void pcibios_set_master(struct pci_dev *dev)
pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
}
-int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state, int write_combine)
-{
- unsigned long prot;
-
- /* Leave vm_pgoff as-is, the PCI space address is the physical
- * address on this platform.
- */
- prot = pgprot_val(vma->vm_page_prot);
- vma->vm_page_prot = __pgprot(prot);
-
- /* Write-combine setting is ignored, it is changed via the mtrr
- * interfaces on this platform.
- */
- if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
- vma->vm_end - vma->vm_start,
- vma->vm_page_prot))
- return -EAGAIN;
-
- return 0;
-}
-
resource_size_t
pcibios_align_resource(void *data, const struct resource *res,
resource_size_t size, resource_size_t align)
diff --git a/arch/cris/include/asm/pci.h b/arch/cris/include/asm/pci.h
index b1b289df04c7..6e505332b3e3 100644
--- a/arch/cris/include/asm/pci.h
+++ b/arch/cris/include/asm/pci.h
@@ -42,9 +42,7 @@ struct pci_dev;
#define PCI_DMA_BUS_IS_PHYS (1)
#define HAVE_PCI_MMAP
-extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state, int write_combine);
-
+#define ARCH_GENERIC_PCI_MMAP_RESOURCE
#endif /* __KERNEL__ */
diff --git a/arch/ia64/include/asm/pci.h b/arch/ia64/include/asm/pci.h
index c0835b0dc722..6459f2d46200 100644
--- a/arch/ia64/include/asm/pci.h
+++ b/arch/ia64/include/asm/pci.h
@@ -51,8 +51,9 @@ extern unsigned long ia64_max_iommu_merge_mask;
#define PCI_DMA_BUS_IS_PHYS (ia64_max_iommu_merge_mask == ~0UL)
#define HAVE_PCI_MMAP
-extern int pci_mmap_page_range (struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state, int write_combine);
+#define ARCH_GENERIC_PCI_MMAP_RESOURCE
+#define arch_can_pci_mmap_wc() 1
+
#define HAVE_PCI_LEGACY
extern int pci_mmap_legacy_page_range(struct pci_bus *bus,
struct vm_area_struct *vma,
diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
index 8f6ac2f8ae4c..4068bde623dc 100644
--- a/arch/ia64/pci/pci.c
+++ b/arch/ia64/pci/pci.c
@@ -418,52 +418,6 @@ pcibios_align_resource (void *data, const struct resource *res,
return res->start;
}
-int
-pci_mmap_page_range (struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state, int write_combine)
-{
- unsigned long size = vma->vm_end - vma->vm_start;
- pgprot_t prot;
-
- /*
- * I/O space cannot be accessed via normal processor loads and
- * stores on this platform.
- */
- if (mmap_state == pci_mmap_io)
- /*
- * XXX we could relax this for I/O spaces for which ACPI
- * indicates that the space is 1-to-1 mapped. But at the
- * moment, we don't support multiple PCI address spaces and
- * the legacy I/O space is not 1-to-1 mapped, so this is moot.
- */
- return -EINVAL;
-
- if (!valid_mmap_phys_addr_range(vma->vm_pgoff, size))
- return -EINVAL;
-
- prot = phys_mem_access_prot(NULL, vma->vm_pgoff, size,
- vma->vm_page_prot);
-
- /*
- * If the user requested WC, the kernel uses UC or WC for this region,
- * and the chipset supports WC, we can use WC. Otherwise, we have to
- * use the same attribute the kernel uses.
- */
- if (write_combine &&
- ((pgprot_val(prot) & _PAGE_MA_MASK) == _PAGE_MA_UC ||
- (pgprot_val(prot) & _PAGE_MA_MASK) == _PAGE_MA_WC) &&
- efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
- vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
- else
- vma->vm_page_prot = prot;
-
- if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
- vma->vm_end - vma->vm_start, vma->vm_page_prot))
- return -EAGAIN;
-
- return 0;
-}
-
/**
* ia64_pci_get_legacy_mem - generic legacy mem routine
* @bus: bus to get legacy memory base address for
diff --git a/arch/microblaze/include/asm/pci.h b/arch/microblaze/include/asm/pci.h
index 2a120bb70e54..efd4983cb697 100644
--- a/arch/microblaze/include/asm/pci.h
+++ b/arch/microblaze/include/asm/pci.h
@@ -46,12 +46,10 @@ extern int pci_domain_nr(struct pci_bus *bus);
extern int pci_proc_domain(struct pci_bus *bus);
struct vm_area_struct;
-/* Map a range of PCI memory or I/O space for a device into user space */
-int pci_mmap_page_range(struct pci_dev *pdev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state, int write_combine);
/* Tell drivers/pci/proc.c that we have pci_mmap_page_range() */
-#define HAVE_PCI_MMAP 1
+#define HAVE_PCI_MMAP 1
+#define arch_can_pci_mmap_io() 1
extern int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val,
size_t count);
diff --git a/arch/microblaze/pci/pci-common.c b/arch/microblaze/pci/pci-common.c
index 13bc93242c0c..404fb38d06b7 100644
--- a/arch/microblaze/pci/pci-common.c
+++ b/arch/microblaze/pci/pci-common.c
@@ -278,7 +278,7 @@ pgprot_t pci_phys_mem_access_prot(struct file *file,
*
* Returns a negative error code on failure, zero on success.
*/
-int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
+int pci_mmap_page_range(struct pci_dev *dev, int bar, struct vm_area_struct *vma,
enum pci_mmap_state mmap_state, int write_combine)
{
resource_size_t offset =
diff --git a/arch/mips/include/asm/pci.h b/arch/mips/include/asm/pci.h
index 30d1129d8624..1000c1b4c875 100644
--- a/arch/mips/include/asm/pci.h
+++ b/arch/mips/include/asm/pci.h
@@ -110,10 +110,7 @@ extern unsigned long PCIBIOS_MIN_MEM;
extern void pcibios_set_master(struct pci_dev *dev);
#define HAVE_PCI_MMAP
-
-extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state, int write_combine);
-
+#define ARCH_GENERIC_PCI_MMAP_RESOURCE
#define HAVE_ARCH_PCI_RESOURCE_TO_USER
/*
diff --git a/arch/mips/pci/pci.c b/arch/mips/pci/pci.c
index f6325fa657fb..bd67ac74fe2d 100644
--- a/arch/mips/pci/pci.c
+++ b/arch/mips/pci/pci.c
@@ -57,27 +57,3 @@ void pci_resource_to_user(const struct pci_dev *dev, int bar,
*start = fixup_bigphys_addr(rsrc->start, size);
*end = rsrc->start + size;
}
-
-int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state, int write_combine)
-{
- unsigned long prot;
-
- /*
- * I/O space can be accessed via normal processor loads and stores on
- * this platform but for now we elect not to do this and portable
- * drivers should not do this anyway.
- */
- if (mmap_state == pci_mmap_io)
- return -EINVAL;
-
- /*
- * Ignore write-combine; for now only return uncached mappings.
- */
- prot = pgprot_val(vma->vm_page_prot);
- prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
- vma->vm_page_prot = __pgprot(prot);
-
- return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
- vma->vm_end - vma->vm_start, vma->vm_page_prot);
-}
diff --git a/arch/mn10300/include/asm/pci.h b/arch/mn10300/include/asm/pci.h
index 51159fff025a..d27654902f28 100644
--- a/arch/mn10300/include/asm/pci.h
+++ b/arch/mn10300/include/asm/pci.h
@@ -74,9 +74,7 @@ static inline int pci_controller_num(struct pci_dev *dev)
}
#define HAVE_PCI_MMAP
-extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state,
- int write_combine);
+#define ARCH_GENERIC_PCI_MMAP_RESOURCE
#endif /* __KERNEL__ */
diff --git a/arch/mn10300/unit-asb2305/pci-asb2305.c b/arch/mn10300/unit-asb2305/pci-asb2305.c
index b7ab8378964c..e0f4617c0c7a 100644
--- a/arch/mn10300/unit-asb2305/pci-asb2305.c
+++ b/arch/mn10300/unit-asb2305/pci-asb2305.c
@@ -210,26 +210,3 @@ void __init pcibios_resource_survey(void)
pcibios_allocate_resources(0);
pcibios_allocate_resources(1);
}
-
-int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state, int write_combine)
-{
- unsigned long prot;
-
- /* Leave vm_pgoff as-is, the PCI space address is the physical
- * address on this platform.
- */
- vma->vm_flags |= VM_LOCKED;
-
- prot = pgprot_val(vma->vm_page_prot);
- prot &= ~_PAGE_CACHE;
- vma->vm_page_prot = __pgprot(prot);
-
- /* Write-combine setting is ignored */
- if (io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
- vma->vm_end - vma->vm_start,
- vma->vm_page_prot))
- return -EAGAIN;
-
- return 0;
-}
diff --git a/arch/parisc/include/asm/pci.h b/arch/parisc/include/asm/pci.h
index defebd956585..1de1a3f412ec 100644
--- a/arch/parisc/include/asm/pci.h
+++ b/arch/parisc/include/asm/pci.h
@@ -200,8 +200,6 @@ static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
}
#define HAVE_PCI_MMAP
-
-extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state, int write_combine);
+#define ARCH_GENERIC_PCI_MMAP_RESOURCE
#endif /* __ASM_PARISC_PCI_H */
diff --git a/arch/parisc/kernel/pci.c b/arch/parisc/kernel/pci.c
index 0903c6abd7a4..13ee3569959a 100644
--- a/arch/parisc/kernel/pci.c
+++ b/arch/parisc/kernel/pci.c
@@ -227,34 +227,6 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
return start;
}
-
-int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state, int write_combine)
-{
- unsigned long prot;
-
- /*
- * I/O space can be accessed via normal processor loads and stores on
- * this platform but for now we elect not to do this and portable
- * drivers should not do this anyway.
- */
- if (mmap_state == pci_mmap_io)
- return -EINVAL;
-
- if (write_combine)
- return -EINVAL;
-
- /*
- * Ignore write-combine; for now only return uncached mappings.
- */
- prot = pgprot_val(vma->vm_page_prot);
- prot |= _PAGE_NO_CACHE;
- vma->vm_page_prot = __pgprot(prot);
-
- return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
- vma->vm_end - vma->vm_start, vma->vm_page_prot);
-}
-
/*
* A driver is enabling the device. We make sure that all the appropriate
* bits are set to allow the device to operate as the driver is expecting.
diff --git a/arch/powerpc/include/asm/pci.h b/arch/powerpc/include/asm/pci.h
index 93eded8d3843..c8975dac535f 100644
--- a/arch/powerpc/include/asm/pci.h
+++ b/arch/powerpc/include/asm/pci.h
@@ -77,12 +77,11 @@ extern int pci_domain_nr(struct pci_bus *bus);
extern int pci_proc_domain(struct pci_bus *bus);
struct vm_area_struct;
-/* Map a range of PCI memory or I/O space for a device into user space */
-int pci_mmap_page_range(struct pci_dev *pdev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state, int write_combine);
-/* Tell drivers/pci/proc.c that we have pci_mmap_page_range() */
-#define HAVE_PCI_MMAP 1
+/* Tell drivers/pci/proc.c that we have pci_mmap_page_range() and it does WC */
+#define HAVE_PCI_MMAP 1
+#define arch_can_pci_mmap_io() 1
+#define arch_can_pci_mmap_wc() 1
extern int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val,
size_t count);
diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index 03a7c9f58126..341a7469cab8 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -521,7 +521,8 @@ pgprot_t pci_phys_mem_access_prot(struct file *file,
*
* Returns a negative error code on failure, zero on success.
*/
-int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
+int pci_mmap_page_range(struct pci_dev *dev, int bar,
+ struct vm_area_struct *vma,
enum pci_mmap_state mmap_state, int write_combine)
{
resource_size_t offset =
diff --git a/arch/sh/drivers/pci/pci.c b/arch/sh/drivers/pci/pci.c
index 84563e39a5b8..c99ee286b69f 100644
--- a/arch/sh/drivers/pci/pci.c
+++ b/arch/sh/drivers/pci/pci.c
@@ -269,27 +269,6 @@ void __ref pcibios_report_status(unsigned int status_mask, int warn)
}
}
-int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state, int write_combine)
-{
- /*
- * I/O space can be accessed via normal processor loads and stores on
- * this platform but for now we elect not to do this and portable
- * drivers should not do this anyway.
- */
- if (mmap_state == pci_mmap_io)
- return -EINVAL;
-
- /*
- * Ignore write-combine; for now only return uncached mappings.
- */
- vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
-
- return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
- vma->vm_end - vma->vm_start,
- vma->vm_page_prot);
-}
-
#ifndef CONFIG_GENERIC_IOMAP
void __iomem *__pci_ioport_map(struct pci_dev *dev,
diff --git a/arch/sh/include/asm/pci.h b/arch/sh/include/asm/pci.h
index 644314f2b1ef..17fa69bc814d 100644
--- a/arch/sh/include/asm/pci.h
+++ b/arch/sh/include/asm/pci.h
@@ -66,8 +66,8 @@ extern unsigned long PCIBIOS_MIN_IO, PCIBIOS_MIN_MEM;
struct pci_dev;
#define HAVE_PCI_MMAP
-extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state, int write_combine);
+#define ARCH_GENERIC_PCI_MMAP_RESOURCE
+
extern void pcibios_set_master(struct pci_dev *dev);
/* Dynamic DMA mapping stuff.
diff --git a/arch/sparc/include/asm/pci_64.h b/arch/sparc/include/asm/pci_64.h
index 2303635158f5..b957ca5527a3 100644
--- a/arch/sparc/include/asm/pci_64.h
+++ b/arch/sparc/include/asm/pci_64.h
@@ -42,13 +42,10 @@ static inline int pci_proc_domain(struct pci_bus *bus)
/* Platform support for /proc/bus/pci/X/Y mmap()s. */
#define HAVE_PCI_MMAP
+#define arch_can_pci_mmap_io() 1
#define HAVE_ARCH_PCI_GET_UNMAPPED_AREA
#define get_pci_unmapped_area get_fb_unmapped_area
-int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state,
- int write_combine);
-
static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
{
return PCI_IRQ_NONE;
diff --git a/arch/sparc/kernel/pci.c b/arch/sparc/kernel/pci.c
index 015e55a7495d..7eceaa10836f 100644
--- a/arch/sparc/kernel/pci.c
+++ b/arch/sparc/kernel/pci.c
@@ -862,9 +862,9 @@ static void __pci_mmap_set_pgprot(struct pci_dev *dev, struct vm_area_struct *vm
*
* Returns a negative error code on failure, zero on success.
*/
-int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state,
- int write_combine)
+int pci_mmap_page_range(struct pci_dev *dev, int bar,
+ struct vm_area_struct *vma,
+ enum pci_mmap_state mmap_state, int write_combine)
{
int ret;
diff --git a/arch/unicore32/include/asm/pci.h b/arch/unicore32/include/asm/pci.h
index 37e55d018de5..ac5acdf4c4d0 100644
--- a/arch/unicore32/include/asm/pci.h
+++ b/arch/unicore32/include/asm/pci.h
@@ -17,8 +17,7 @@
#include <mach/hardware.h> /* for PCIBIOS_MIN_* */
#define HAVE_PCI_MMAP
-extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state, int write_combine);
+#define ARCH_GENERIC_PCI_MMAP_RESOURCE
#endif /* __KERNEL__ */
#endif
diff --git a/arch/unicore32/kernel/pci.c b/arch/unicore32/kernel/pci.c
index 62137d13c6f9..1053bca1f8aa 100644
--- a/arch/unicore32/kernel/pci.c
+++ b/arch/unicore32/kernel/pci.c
@@ -356,26 +356,3 @@ int pcibios_enable_device(struct pci_dev *dev, int mask)
}
return 0;
}
-
-int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state, int write_combine)
-{
- unsigned long phys;
-
- if (mmap_state == pci_mmap_io)
- return -EINVAL;
-
- phys = vma->vm_pgoff;
-
- /*
- * Mark this as IO
- */
- vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
-
- if (remap_pfn_range(vma, vma->vm_start, phys,
- vma->vm_end - vma->vm_start,
- vma->vm_page_prot))
- return -EAGAIN;
-
- return 0;
-}
diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
index 1411dbed5e5e..f513cc231151 100644
--- a/arch/x86/include/asm/pci.h
+++ b/arch/x86/include/asm/pci.h
@@ -7,6 +7,7 @@
#include <linux/string.h>
#include <linux/scatterlist.h>
#include <asm/io.h>
+#include <asm/pat.h>
#include <asm/x86_init.h>
#ifdef __KERNEL__
@@ -102,10 +103,8 @@ int pcibios_set_irq_routing(struct pci_dev *dev, int pin, int irq);
#define HAVE_PCI_MMAP
-extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state,
- int write_combine);
-
+#define arch_can_pci_mmap_wc() pat_enabled()
+#define ARCH_GENERIC_PCI_MMAP_RESOURCE
#ifdef CONFIG_PCI
extern void early_quirks(void);
diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
index 0a9f2caf358f..68499cf82ccf 100644
--- a/arch/x86/pci/i386.c
+++ b/arch/x86/pci/i386.c
@@ -406,50 +406,3 @@ void __init pcibios_resource_survey(void)
*/
ioapic_insert_resources();
}
-
-static const struct vm_operations_struct pci_mmap_ops = {
- .access = generic_access_phys,
-};
-
-int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state, int write_combine)
-{
- unsigned long prot;
-
- /* I/O space cannot be accessed via normal processor loads and
- * stores on this platform.
- */
- if (mmap_state == pci_mmap_io)
- return -EINVAL;
-
- prot = pgprot_val(vma->vm_page_prot);
-
- /*
- * Return error if pat is not enabled and write_combine is requested.
- * Caller can followup with UC MINUS request and add a WC mtrr if there
- * is a free mtrr slot.
- */
- if (!pat_enabled() && write_combine)
- return -EINVAL;
-
- if (pat_enabled() && write_combine)
- prot |= cachemode2protval(_PAGE_CACHE_MODE_WC);
- else if (pat_enabled() || boot_cpu_data.x86 > 3)
- /*
- * ioremap() and ioremap_nocache() defaults to UC MINUS for now.
- * To avoid attribute conflicts, request UC MINUS here
- * as well.
- */
- prot |= cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS);
-
- vma->vm_page_prot = __pgprot(prot);
-
- if (io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
- vma->vm_end - vma->vm_start,
- vma->vm_page_prot))
- return -EAGAIN;
-
- vma->vm_ops = &pci_mmap_ops;
-
- return 0;
-}
diff --git a/arch/xtensa/include/asm/pci.h b/arch/xtensa/include/asm/pci.h
index 5d6bd932ba4e..e4f366a488d3 100644
--- a/arch/xtensa/include/asm/pci.h
+++ b/arch/xtensa/include/asm/pci.h
@@ -46,12 +46,9 @@ struct pci_dev;
#define PCI_DMA_BUS_IS_PHYS (1)
-/* Map a range of PCI memory or I/O space for a device into user space */
-int pci_mmap_page_range(struct pci_dev *pdev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state, int write_combine);
-
/* Tell drivers/pci/proc.c that we have pci_mmap_page_range() */
-#define HAVE_PCI_MMAP 1
+#define HAVE_PCI_MMAP 1
+#define arch_can_pci_mmap_io() 1
#endif /* __KERNEL__ */
diff --git a/arch/xtensa/kernel/pci.c b/arch/xtensa/kernel/pci.c
index b848cc3dc913..903963ee495d 100644
--- a/arch/xtensa/kernel/pci.c
+++ b/arch/xtensa/kernel/pci.c
@@ -334,25 +334,6 @@ __pci_mmap_make_offset(struct pci_dev *dev, struct vm_area_struct *vma,
}
/*
- * Set vm_page_prot of VMA, as appropriate for this architecture, for a pci
- * device mapping.
- */
-static __inline__ void
-__pci_mmap_set_pgprot(struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state, int write_combine)
-{
- int prot = pgprot_val(vma->vm_page_prot);
-
- /* Set to write-through */
- prot = (prot & _PAGE_CA_MASK) | _PAGE_CA_WT;
-#if 0
- if (!write_combine)
- prot |= _PAGE_WRITETHRU;
-#endif
- vma->vm_page_prot = __pgprot(prot);
-}
-
-/*
* Perform the actual remap of the pages for a PCI device mapping, as
* appropriate for this architecture. The region in the process to map
* is described by vm_start and vm_end members of VMA, the base physical
@@ -362,7 +343,8 @@ __pci_mmap_set_pgprot(struct pci_dev *dev, struct vm_area_struct *vma,
*
* Returns a negative error code on failure, zero on success.
*/
-int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
+int pci_mmap_page_range(struct pci_dev *dev, int bar,
+ struct vm_area_struct *vma,
enum pci_mmap_state mmap_state,
int write_combine)
{
@@ -372,7 +354,7 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
if (ret < 0)
return ret;
- __pci_mmap_set_pgprot(dev, vma, mmap_state, write_combine);
+ vma->vm_page_prot = pgprot_device(vma->vm_page_prot);
ret = io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
vma->vm_end - vma->vm_start,vma->vm_page_prot);
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index 15b46dd5074b..462c1f5f5546 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -4,7 +4,7 @@
obj-y += access.o bus.o probe.o host-bridge.o remove.o pci.o \
pci-driver.o search.o pci-sysfs.o rom.o setup-res.o \
- irq.o vpd.o setup-bus.o vc.o
+ irq.o vpd.o setup-bus.o vc.o mmap.o
obj-$(CONFIG_PROC_FS) += proc.o
obj-$(CONFIG_SYSFS) += slot.o
diff --git a/drivers/pci/mmap.c b/drivers/pci/mmap.c
new file mode 100644
index 000000000000..9a5e5a9055eb
--- /dev/null
+++ b/drivers/pci/mmap.c
@@ -0,0 +1,99 @@
+/*
+ * mmap.c — generic PCI resource mmap helper
+ *
+ * Copyright © 2017 Amazon.com, Inc. or its affiliates.
+ *
+ * Author: David Woodhouse <dwmw2@infradead.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/pci.h>
+
+#ifdef ARCH_GENERIC_PCI_MMAP_RESOURCE
+
+/*
+ * Modern setup: generic pci_mmap_resource_range(), and implement the legacy
+ * pci_mmap_page_range() (if needed) as a wrapper round it.
+ */
+
+#ifdef HAVE_PCI_MMAP
+int pci_mmap_page_range(struct pci_dev *pdev, int bar,
+ struct vm_area_struct *vma,
+ enum pci_mmap_state mmap_state, int write_combine)
+{
+ resource_size_t start, end;
+
+ pci_resource_to_user(pdev, bar, &pdev->resource[bar], &start, &end);
+
+ /* Adjust vm_pgoff to be the offset within the resource */
+ vma->vm_pgoff -= start >> PAGE_SHIFT;
+ return pci_mmap_resource_range(pdev, bar, vma, mmap_state,
+ write_combine);
+}
+#endif
+
+static const struct vm_operations_struct pci_phys_vm_ops = {
+#ifdef CONFIG_HAVE_IOREMAP_PROT
+ .access = generic_access_phys,
+#endif
+};
+
+int pci_mmap_resource_range(struct pci_dev *pdev, int bar,
+ struct vm_area_struct *vma,
+ enum pci_mmap_state mmap_state, int write_combine)
+{
+ unsigned long size;
+ int ret;
+
+ size = ((pci_resource_len(pdev, bar) - 1) >> PAGE_SHIFT) + 1;
+ if (vma->vm_pgoff + vma_pages(vma) > size)
+ return -EINVAL;
+
+ if (write_combine)
+ vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
+ else
+ vma->vm_page_prot = pgprot_device(vma->vm_page_prot);
+
+ if (mmap_state == pci_mmap_io) {
+ ret = pci_iobar_pfn(pdev, bar, vma);
+ if (ret)
+ return ret;
+ } else
+ vma->vm_pgoff += (pci_resource_start(pdev, bar) >> PAGE_SHIFT);
+
+ vma->vm_ops = &pci_phys_vm_ops;
+
+ return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
+ vma->vm_end - vma->vm_start,
+ vma->vm_page_prot);
+}
+
+#elif defined(HAVE_PCI_MMAP) /* && !ARCH_GENERIC_PCI_MMAP_RESOURCE */
+
+/*
+ * Legacy setup: Impement pci_mmap_resource_range() as a wrapper around
+ * the architecture's pci_mmap_page_range(), converting to "user visible"
+ * addresses as necessary.
+ */
+
+int pci_mmap_resource_range(struct pci_dev *pdev, int bar,
+ struct vm_area_struct *vma,
+ enum pci_mmap_state mmap_state, int write_combine)
+{
+ resource_size_t start, end;
+
+ /*
+ * pci_mmap_page_range() expects the same kind of entry as coming
+ * from /proc/bus/pci/ which is a "user visible" value. If this is
+ * different from the resource itself, arch will do necessary fixup.
+ */
+ pci_resource_to_user(pdev, bar, &pdev->resource[bar], &start, &end);
+ vma->vm_pgoff += start >> PAGE_SHIFT;
+ return pci_mmap_page_range(pdev, bar, vma, mmap_state, write_combine);
+}
+#endif
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 25d010d449a3..10feb98a2b1d 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -980,20 +980,24 @@ void pci_remove_legacy_files(struct pci_bus *b)
}
#endif /* HAVE_PCI_LEGACY */
-#ifdef HAVE_PCI_MMAP
+#if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
enum pci_mmap_api mmap_api)
{
- unsigned long nr, start, size, pci_start;
+ unsigned long nr, start, size;
+ resource_size_t pci_start = 0, pci_end;
if (pci_resource_len(pdev, resno) == 0)
return 0;
nr = vma_pages(vma);
start = vma->vm_pgoff;
size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
- pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
- pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
+ if (mmap_api == PCI_MMAP_PROCFS) {
+ pci_resource_to_user(pdev, resno, &pdev->resource[resno],
+ &pci_start, &pci_end);
+ pci_start >>= PAGE_SHIFT;
+ }
if (start >= pci_start && start < pci_start + size &&
start + nr <= pci_start + size)
return 1;
@@ -1013,37 +1017,24 @@ static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
struct vm_area_struct *vma, int write_combine)
{
struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
- struct resource *res = attr->private;
+ int bar = (unsigned long)attr->private;
enum pci_mmap_state mmap_type;
- resource_size_t start, end;
- int i;
-
- for (i = 0; i < PCI_ROM_RESOURCE; i++)
- if (res == &pdev->resource[i])
- break;
- if (i >= PCI_ROM_RESOURCE)
- return -ENODEV;
+ struct resource *res = &pdev->resource[bar];
if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
return -EINVAL;
- if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
+ if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS)) {
WARN(1, "process \"%s\" tried to map 0x%08lx bytes at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
- pci_name(pdev), i,
- (u64)pci_resource_start(pdev, i),
- (u64)pci_resource_len(pdev, i));
+ pci_name(pdev), bar,
+ (u64)pci_resource_start(pdev, bar),
+ (u64)pci_resource_len(pdev, bar));
return -EINVAL;
}
-
- /* pci_mmap_page_range() expects the same kind of entry as coming
- * from /proc/bus/pci/ which is a "user visible" value. If this is
- * different from the resource itself, arch will do necessary fixup.
- */
- pci_resource_to_user(pdev, i, res, &start, &end);
- vma->vm_pgoff += start >> PAGE_SHIFT;
mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
- return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
+
+ return pci_mmap_resource_range(pdev, bar, vma, mmap_type, write_combine);
}
static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
@@ -1065,22 +1056,18 @@ static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
loff_t off, size_t count, bool write)
{
struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
- struct resource *res = attr->private;
+ int bar = (unsigned long)attr->private;
+ struct resource *res;
unsigned long port = off;
- int i;
- for (i = 0; i < PCI_ROM_RESOURCE; i++)
- if (res == &pdev->resource[i])
- break;
- if (i >= PCI_ROM_RESOURCE)
- return -ENODEV;
+ res = &pdev->resource[bar];
- port += pci_resource_start(pdev, i);
+ port += pci_resource_start(pdev, bar);
- if (port > pci_resource_end(pdev, i))
+ if (port > pci_resource_end(pdev, bar))
return 0;
- if (port + count - 1 > pci_resource_end(pdev, i))
+ if (port + count - 1 > pci_resource_end(pdev, bar))
return -EINVAL;
switch (count) {
@@ -1170,16 +1157,19 @@ static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
} else {
pdev->res_attr[num] = res_attr;
sprintf(res_attr_name, "resource%d", num);
- res_attr->mmap = pci_mmap_resource_uc;
- }
- if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
- res_attr->read = pci_read_resource_io;
- res_attr->write = pci_write_resource_io;
+ if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
+ res_attr->read = pci_read_resource_io;
+ res_attr->write = pci_write_resource_io;
+ if (arch_can_pci_mmap_io())
+ res_attr->mmap = pci_mmap_resource_uc;
+ } else {
+ res_attr->mmap = pci_mmap_resource_uc;
+ }
}
res_attr->attr.name = res_attr_name;
res_attr->attr.mode = S_IRUSR | S_IWUSR;
res_attr->size = pci_resource_len(pdev, num);
- res_attr->private = &pdev->resource[num];
+ res_attr->private = (void *)(unsigned long)num;
retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
if (retval)
kfree(res_attr);
@@ -1207,9 +1197,9 @@ static int pci_create_resource_files(struct pci_dev *pdev)
retval = pci_create_attr(pdev, i, 0);
/* for prefetchable resources, create a WC mappable file */
- if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
+ if (!retval && arch_can_pci_mmap_wc() &&
+ pdev->resource[i].flags & IORESOURCE_PREFETCH)
retval = pci_create_attr(pdev, i, 1);
-
if (retval) {
pci_remove_resource_files(pdev);
return retval;
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 245719c3e409..71fa82359b5b 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -21,14 +21,14 @@ void pci_create_firmware_label_files(struct pci_dev *pdev);
void pci_remove_firmware_label_files(struct pci_dev *pdev);
#endif
void pci_cleanup_rom(struct pci_dev *dev);
-#ifdef HAVE_PCI_MMAP
+
enum pci_mmap_api {
PCI_MMAP_SYSFS, /* mmap on /sys/bus/pci/devices/<BDF>/resource<N> */
PCI_MMAP_PROCFS /* mmap on /proc/bus/pci/<BDF> */
};
int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vmai,
enum pci_mmap_api mmap_api);
-#endif
+
int pci_probe_reset_function(struct pci_dev *dev);
/**
diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c
index f82710a8694d..098360d7ff81 100644
--- a/drivers/pci/proc.c
+++ b/drivers/pci/proc.c
@@ -202,6 +202,8 @@ static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
#ifdef HAVE_PCI_MMAP
case PCIIOC_MMAP_IS_IO:
+ if (!arch_can_pci_mmap_io())
+ return -EINVAL;
fpriv->mmap_state = pci_mmap_io;
break;
@@ -210,14 +212,15 @@ static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
break;
case PCIIOC_WRITE_COMBINE:
- if (arg)
- fpriv->write_combine = 1;
- else
- fpriv->write_combine = 0;
- break;
-
+ if (arch_can_pci_mmap_wc()) {
+ if (arg)
+ fpriv->write_combine = 1;
+ else
+ fpriv->write_combine = 0;
+ break;
+ }
+ /* If arch decided it can't, fall through... */
#endif /* HAVE_PCI_MMAP */
-
default:
ret = -EINVAL;
break;
@@ -231,25 +234,35 @@ static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
{
struct pci_dev *dev = PDE_DATA(file_inode(file));
struct pci_filp_private *fpriv = file->private_data;
- int i, ret, write_combine;
+ int i, ret, write_combine = 0, res_bit = IORESOURCE_MEM;
if (!capable(CAP_SYS_RAWIO))
return -EPERM;
+ if (fpriv->mmap_state == pci_mmap_io) {
+ if (!arch_can_pci_mmap_io())
+ return -EINVAL;
+ res_bit = IORESOURCE_IO;
+ }
+
/* Make sure the caller is mapping a real resource for this device */
for (i = 0; i < PCI_ROM_RESOURCE; i++) {
- if (pci_mmap_fits(dev, i, vma, PCI_MMAP_PROCFS))
+ if (dev->resource[i].flags & res_bit &&
+ pci_mmap_fits(dev, i, vma, PCI_MMAP_PROCFS))
break;
}
if (i >= PCI_ROM_RESOURCE)
return -ENODEV;
- if (fpriv->mmap_state == pci_mmap_mem)
- write_combine = fpriv->write_combine;
- else
- write_combine = 0;
- ret = pci_mmap_page_range(dev, vma,
+ if (fpriv->mmap_state == pci_mmap_mem &&
+ fpriv->write_combine) {
+ if (dev->resource[i].flags & IORESOURCE_PREFETCH)
+ write_combine = 1;
+ else
+ return -EINVAL;
+ }
+ ret = pci_mmap_page_range(dev, i, vma,
fpriv->mmap_state, write_combine);
if (ret < 0)
return ret;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index d8ffed9cb1a5..bbd17d49c947 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1617,6 +1617,36 @@ static inline int pci_get_new_domain_nr(void) { return -ENOSYS; }
#include <asm/pci.h>
+/* These two functions provide almost identical functionality. Depennding
+ * on the architecture, one will be implemented as a wrapper around the
+ * other (in drivers/pci/mmap.c).
+ *
+ * pci_mmap_resource_range() maps a specific BAR, and vm->vm_pgoff
+ * is expected to be an offset within that region.
+ *
+ * pci_mmap_page_range() is the legacy architecture-specific interface,
+ * which accepts a "user visible" resource address converted by
+ * pci_resource_to_user(), as used in the legacy mmap() interface in
+ * /proc/bus/pci/.
+ */
+int pci_mmap_resource_range(struct pci_dev *dev, int bar,
+ struct vm_area_struct *vma,
+ enum pci_mmap_state mmap_state, int write_combine);
+int pci_mmap_page_range(struct pci_dev *pdev, int bar,
+ struct vm_area_struct *vma,
+ enum pci_mmap_state mmap_state, int write_combine);
+
+#ifndef arch_can_pci_mmap_wc
+#define arch_can_pci_mmap_wc() 0
+#endif
+
+#ifndef arch_can_pci_mmap_io
+#define arch_can_pci_mmap_io() 0
+#define pci_iobar_pfn(pdev, bar, vma) (-EINVAL)
+#else
+int pci_iobar_pfn(struct pci_dev *pdev, int bar, struct vm_area_struct *vma);
+#endif
+
#ifndef pci_root_bus_fwnode
#define pci_root_bus_fwnode(bus) NULL
#endif