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gpu/drm, x86, PAT: routine to keep identity map in sync

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Add a function to check and keep identity maps in sync, when changing
any memory type. One of the follow on patches will also use this
routine.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Eric Anholt <eric@anholt.net>
Cc: Keith Packard <keithp@keithp.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Venkatesh Pallipadi 2009-02-24 17:35:13 -08:00 committed by Ingo Molnar
parent 4ab0d47d0a
commit 7880f74645
2 changed files with 32 additions and 17 deletions
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3
arch/x86/include/asm/pat.h
View file

@ -19,4 +19,7 @@ extern int free_memtype(u64 start, u64 end);
extern void pat_disable(char *reason);
extern int kernel_map_sync_memtype(u64 base, unsigned long size,
unsigned long flag);
#endif /* _ASM_X86_PAT_H */

46
arch/x86/mm/pat.c
View file

@ -624,6 +624,33 @@ void unmap_devmem(unsigned long pfn, unsigned long size, pgprot_t vma_prot)
free_memtype(addr, addr + size);
}
/*
* Change the memory type for the physial address range in kernel identity
* mapping space if that range is a part of identity map.
*/
int kernel_map_sync_memtype(u64 base, unsigned long size, unsigned long flags)
{
unsigned long id_sz;
if (!pat_enabled || base >= __pa(high_memory))
return 0;
id_sz = (__pa(high_memory) < base + size) ?
__pa(high_memory) - base :
size;
if (ioremap_change_attr((unsigned long)__va(base), id_sz, flags) < 0) {
printk(KERN_INFO
"%s:%d ioremap_change_attr failed %s "
"for %Lx-%Lx\n",
current->comm, current->pid,
cattr_name(flags),
base, (unsigned long long)(base + size));
return -EINVAL;
}
return 0;
}
/*
* Internal interface to reserve a range of physical memory with prot.
* Reserved non RAM regions only and after successful reserve_memtype,
@ -633,7 +660,7 @@ static int reserve_pfn_range(u64 paddr, unsigned long size, pgprot_t *vma_prot,
int strict_prot)
{
int is_ram = 0;
int id_sz, ret;
int ret;
unsigned long flags;
unsigned long want_flags = (pgprot_val(*vma_prot) & _PAGE_CACHE_MASK);
@ -670,23 +697,8 @@ static int reserve_pfn_range(u64 paddr, unsigned long size, pgprot_t *vma_prot,
flags);
}
/* Need to keep identity mapping in sync */
if (paddr >= __pa(high_memory))
return 0;
id_sz = (__pa(high_memory) < paddr + size) ?
__pa(high_memory) - paddr :
size;
if (ioremap_change_attr((unsigned long)__va(paddr), id_sz, flags) < 0) {
if (kernel_map_sync_memtype(paddr, size, flags) < 0) {
free_memtype(paddr, paddr + size);
printk(KERN_ERR
"%s:%d reserve_pfn_range ioremap_change_attr failed %s "
"for %Lx-%Lx\n",
current->comm, current->pid,
cattr_name(flags),
(unsigned long long)paddr,
(unsigned long long)(paddr + size));
return -EINVAL;
}
return 0;