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x86: PAT use reserve free memtype in pci_mmap_page_range 

Add reserve_memtype and free_memtype wrapper for pci_mmap_page_range. Free
is called on unmap, but identity map continues to be mapped as per
pci_mmap_page_range request, until next request for the same region calls
ioremap_change_attr(), which will go through without conflict. This way of
mapping is identical to one used in ioremap/iounmap.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
venkatesh.pallipadi@intel.com 2008-03-18 17:00:19 -07:00 committed by Ingo Molnar
parent 1219333dfd
commit 03d72aa18f
1 changed files with 60 additions and 8 deletions
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68
arch/x86/pci/i386.c
View File

@ -30,6 +30,9 @@
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/errno.h>
#include <linux/bootmem.h>
#include <asm/pat.h>
#include "pci.h"
@ -297,10 +300,34 @@ void pcibios_set_master(struct pci_dev *dev)
pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
}
static void pci_unmap_page_range(struct vm_area_struct *vma)
{
u64 addr = (u64)vma->vm_pgoff << PAGE_SHIFT;
free_memtype(addr, addr + vma->vm_end - vma->vm_start);
}
static void pci_track_mmap_page_range(struct vm_area_struct *vma)
{
u64 addr = (u64)vma->vm_pgoff << PAGE_SHIFT;
unsigned long flags = pgprot_val(vma->vm_page_prot)
& _PAGE_CACHE_MASK;
reserve_memtype(addr, addr + vma->vm_end - vma->vm_start, flags, NULL);
}
static struct vm_operations_struct pci_mmap_ops = {
.open = pci_track_mmap_page_range,
.close = pci_unmap_page_range,
};
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;
u64 addr = vma->vm_pgoff << PAGE_SHIFT;
unsigned long len = vma->vm_end - vma->vm_start;
unsigned long flags;
unsigned long new_flags;
/* I/O space cannot be accessed via normal processor loads and
* stores on this platform.
@ -308,21 +335,46 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
if (mmap_state == pci_mmap_io)
return -EINVAL;
/* Leave vm_pgoff as-is, the PCI space address is the physical
* address on this platform.
*/
prot = pgprot_val(vma->vm_page_prot);
if (boot_cpu_data.x86 > 3)
prot |= _PAGE_PCD | _PAGE_PWT;
if (pat_wc_enabled && write_combine)
prot |= _PAGE_CACHE_WC;
else if (boot_cpu_data.x86 > 3)
prot |= _PAGE_CACHE_UC;
vma->vm_page_prot = __pgprot(prot);
/* Write-combine setting is ignored, it is changed via the mtrr
* interfaces on this platform.
*/
flags = pgprot_val(vma->vm_page_prot) & _PAGE_CACHE_MASK;
if (reserve_memtype(addr, addr + len, flags, &new_flags)) {
/*
* Do not fallback to certain memory types with certain
* requested type:
* - request is uncached, return cannot be write-back
* - request is uncached, return cannot be write-combine
* - request is write-combine, return cannot be write-back
*/
if ((flags == _PAGE_CACHE_UC &&
(new_flags == _PAGE_CACHE_WB ||
new_flags == _PAGE_CACHE_WC)) ||
(flags == _PAGE_CACHE_WC &&
new_flags == _PAGE_CACHE_WB)) {
free_memtype(addr, addr+len);
return -EINVAL;
}
flags = new_flags;
}
if (vma->vm_pgoff <= max_pfn_mapped &&
ioremap_change_attr((unsigned long)__va(addr), len, flags)) {
free_memtype(addr, addr + len);
return -EINVAL;
}
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;
}