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x86: PAT use reserve free memtype in mmap of /dev/mem

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Use reserve_memtype and free_memtype wrappers for /dev/mem mmaps. The memtype
is slightly complicated here, given that we have to support existing X mappings.
We fallback on UC_MINUS for that.

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 17:00:21 -07:00
committed by Ingo Molnar
parent f0970c13b6
commit e7f260a276
2 changed files with 152 additions and 11 deletions
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35
drivers/char/mem.c
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@@ -300,6 +300,35 @@ static inline int private_mapping_ok(struct vm_area_struct *vma)
}
#endif
void __attribute__((weak))
map_devmem(unsigned long pfn, unsigned long len, pgprot_t prot)
{
/* nothing. architectures can override. */
}
void __attribute__((weak))
unmap_devmem(unsigned long pfn, unsigned long len, pgprot_t prot)
{
/* nothing. architectures can override. */
}
static void mmap_mem_open(struct vm_area_struct *vma)
{
map_devmem(vma->vm_pgoff, vma->vm_end - vma->vm_start,
vma->vm_page_prot);
}
static void mmap_mem_close(struct vm_area_struct *vma)
{
unmap_devmem(vma->vm_pgoff, vma->vm_end - vma->vm_start,
vma->vm_page_prot);
}
static struct vm_operations_struct mmap_mem_ops = {
.open = mmap_mem_open,
.close = mmap_mem_close
};
static int mmap_mem(struct file * file, struct vm_area_struct * vma)
{
size_t size = vma->vm_end - vma->vm_start;
@@ -321,13 +350,17 @@ static int mmap_mem(struct file * file, struct vm_area_struct * vma)
size,
vma->vm_page_prot);
vma->vm_ops = &mmap_mem_ops;
/* Remap-pfn-range will mark the range VM_IO and VM_RESERVED */
if (remap_pfn_range(vma,
vma->vm_start,
vma->vm_pgoff,
size,
vma->vm_page_prot))
vma->vm_page_prot)) {
unmap_devmem(vma->vm_pgoff, size, vma->vm_page_prot);
return -EAGAIN;
}
return 0;
}