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PCI: Add ability to mmap legacy_io on some platforms

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This adds the ability to mmap legacy IO space to the legacy_io files
in sysfs on platforms that support it. This will allow to clean up
X to use this instead of /dev/mem for legacy IO accesses such as
those performed by Int10.

While at it I moved pci_create/remove_legacy_files() to pci-sysfs.c
where I think they belong, thus making more things statis in there
and cleaned up some spurrious prototypes in the ia64 pci.h file

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Benjamin Herrenschmidt
2008-10-03 19:49:32 +10:00
committed by Jesse Barnes
parent f393d9b130
commit f19aeb1f36
5 changed files with 102 additions and 82 deletions
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12
arch/ia64/include/asm/pci.h
View File

@@ -95,16 +95,8 @@ 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 HAVE_PCI_LEGACY
extern int pci_mmap_legacy_page_range(struct pci_bus *bus,
struct vm_area_struct *vma);
extern ssize_t pci_read_legacy_io(struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t off, size_t count);
extern ssize_t pci_write_legacy_io(struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t off, size_t count);
extern int pci_mmap_legacy_mem(struct kobject *kobj,
struct bin_attribute *attr,
struct vm_area_struct *vma);
struct vm_area_struct *vma,
enum pci_mmap_state mmap_state);
#define pci_get_legacy_mem platform_pci_get_legacy_mem
#define pci_legacy_read platform_pci_legacy_read

7
arch/ia64/pci/pci.c
View File

@@ -614,12 +614,17 @@ char *ia64_pci_get_legacy_mem(struct pci_bus *bus)
* vector to get the base address.
*/
int
pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma)
pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma,
enum pci_mmap_state mmap_state)
{
unsigned long size = vma->vm_end - vma->vm_start;
pgprot_t prot;
char *addr;
/* We only support mmap'ing of legacy memory space */
if (mmap_state != pci_mmap_mem)
return -ENOSYS;
/*
* Avoid attribute aliasing. See Documentation/ia64/aliasing.txt
* for more details.