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Merge branch 'x86-pat-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 

* 'x86-pat-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86 PAT: remove CPA WARN_ON for zero pte
  x86 PAT: return compatible mapping to remap_pfn_range callers
  x86 PAT: change track_pfn_vma_new to take pgprot_t pointer param
  x86 PAT: consolidate old memtype new memtype check into a function
  x86 PAT: remove PFNMAP type on track_pfn_vma_new() error
This commit is contained in:
Linus Torvalds 2009-01-13 14:53:16 -08:00
parent b9a0d06a35 58dab916df
commit a6525042bf
6 changed files with 100 additions and 50 deletions
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19
arch/x86/include/asm/pgtable.h
View File

@ -341,6 +341,25 @@ static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
#define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask)
static inline int is_new_memtype_allowed(unsigned long flags,
unsigned long new_flags)
{
/*
* Certain new memtypes are not allowed with certain
* requested memtype:
* - request is uncached, return cannot be write-back
* - request is write-combine, return cannot be write-back
*/
if ((flags == _PAGE_CACHE_UC_MINUS &&
new_flags == _PAGE_CACHE_WB) ||
(flags == _PAGE_CACHE_WC &&
new_flags == _PAGE_CACHE_WB)) {
return 0;
}
return 1;
}
#ifndef __ASSEMBLY__
/* Indicate that x86 has its own track and untrack pfn vma functions */
#define __HAVE_PFNMAP_TRACKING

10
arch/x86/mm/pageattr.c
View File

@ -555,10 +555,12 @@ static int __change_page_attr(struct cpa_data *cpa, int primary)
if (!pte_val(old_pte)) {
if (!primary)
return 0;
WARN(1, KERN_WARNING "CPA: called for zero pte. "
"vaddr = %lx cpa->vaddr = %lx\n", address,
*cpa->vaddr);
return -EINVAL;
/*
* Special error value returned, indicating that the mapping
* did not exist at this address.
*/
return -EFAULT;
}
if (level == PG_LEVEL_4K) {

90
arch/x86/mm/pat.c
View File

@ -505,6 +505,35 @@ static inline int range_is_allowed(unsigned long pfn, unsigned long size)
}
#endif /* CONFIG_STRICT_DEVMEM */
/*
* Change the memory type for the physial address range in kernel identity
* mapping space if that range is a part of identity map.
*/
static int kernel_map_sync_memtype(u64 base, unsigned long size,
unsigned long flags)
{
unsigned long id_sz;
int ret;
if (!pat_enabled || base >= __pa(high_memory))
return 0;
id_sz = (__pa(high_memory) < base + size) ?
__pa(high_memory) - base :
size;
ret = ioremap_change_attr((unsigned long)__va(base), id_sz, flags);
/*
* -EFAULT return means that the addr was not valid and did not have
* any identity mapping. That case is a success for
* kernel_map_sync_memtype.
*/
if (ret == -EFAULT)
ret = 0;
return ret;
}
int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
unsigned long size, pgprot_t *vma_prot)
{
@ -555,9 +584,7 @@ int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
if (retval < 0)
return 0;
if (((pfn < max_low_pfn_mapped) ||
(pfn >= (1UL<<(32 - PAGE_SHIFT)) && pfn < max_pfn_mapped)) &&
ioremap_change_attr((unsigned long)__va(offset), size, flags) < 0) {
if (kernel_map_sync_memtype(offset, size, flags)) {
free_memtype(offset, offset + size);
printk(KERN_INFO
"%s:%d /dev/mem ioremap_change_attr failed %s for %Lx-%Lx\n",
@ -601,12 +628,13 @@ void unmap_devmem(unsigned long pfn, unsigned long size, pgprot_t vma_prot)
* Reserved non RAM regions only and after successful reserve_memtype,
* this func also keeps identity mapping (if any) in sync with this new prot.
*/
static int reserve_pfn_range(u64 paddr, unsigned long size, pgprot_t vma_prot)
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);
unsigned long want_flags = (pgprot_val(*vma_prot) & _PAGE_CACHE_MASK);
is_ram = pagerange_is_ram(paddr, paddr + size);
@ -625,26 +653,27 @@ static int reserve_pfn_range(u64 paddr, unsigned long size, pgprot_t vma_prot)
return ret;
if (flags != want_flags) {
free_memtype(paddr, paddr + size);
printk(KERN_ERR
"%s:%d map pfn expected mapping type %s for %Lx-%Lx, got %s\n",
current->comm, current->pid,
cattr_name(want_flags),
(unsigned long long)paddr,
(unsigned long long)(paddr + size),
cattr_name(flags));
return -EINVAL;
if (strict_prot || !is_new_memtype_allowed(want_flags, flags)) {
free_memtype(paddr, paddr + size);
printk(KERN_ERR "%s:%d map pfn expected mapping type %s"
" for %Lx-%Lx, got %s\n",
current->comm, current->pid,
cattr_name(want_flags),
(unsigned long long)paddr,
(unsigned long long)(paddr + size),
cattr_name(flags));
return -EINVAL;
}
/*
* We allow returning different type than the one requested in
* non strict case.
*/
*vma_prot = __pgprot((pgprot_val(*vma_prot) &
(~_PAGE_CACHE_MASK)) |
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)) {
free_memtype(paddr, paddr + size);
printk(KERN_ERR
"%s:%d reserve_pfn_range ioremap_change_attr failed %s "
@ -689,6 +718,7 @@ int track_pfn_vma_copy(struct vm_area_struct *vma)
unsigned long vma_start = vma->vm_start;
unsigned long vma_end = vma->vm_end;
unsigned long vma_size = vma_end - vma_start;
pgprot_t pgprot;
if (!pat_enabled)
return 0;
@ -702,7 +732,8 @@ int track_pfn_vma_copy(struct vm_area_struct *vma)
WARN_ON_ONCE(1);
return -EINVAL;
}
return reserve_pfn_range(paddr, vma_size, __pgprot(prot));
pgprot = __pgprot(prot);
return reserve_pfn_range(paddr, vma_size, &pgprot, 1);
}
/* reserve entire vma page by page, using pfn and prot from pte */
@ -710,7 +741,8 @@ int track_pfn_vma_copy(struct vm_area_struct *vma)
if (follow_phys(vma, vma_start + i, 0, &prot, &paddr))
continue;
retval = reserve_pfn_range(paddr, PAGE_SIZE, __pgprot(prot));
pgprot = __pgprot(prot);
retval = reserve_pfn_range(paddr, PAGE_SIZE, &pgprot, 1);
if (retval)
goto cleanup_ret;
}
@ -741,7 +773,7 @@ int track_pfn_vma_copy(struct vm_area_struct *vma)
* Note that this function can be called with caller trying to map only a
* subrange/page inside the vma.
*/
int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t prot,
int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t *prot,
unsigned long pfn, unsigned long size)
{
int retval = 0;
@ -758,14 +790,14 @@ int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t prot,
if (is_linear_pfn_mapping(vma)) {
/* reserve the whole chunk starting from vm_pgoff */
paddr = (resource_size_t)vma->vm_pgoff << PAGE_SHIFT;
return reserve_pfn_range(paddr, vma_size, prot);
return reserve_pfn_range(paddr, vma_size, prot, 0);
}
/* reserve page by page using pfn and size */
base_paddr = (resource_size_t)pfn << PAGE_SHIFT;
for (i = 0; i < size; i += PAGE_SIZE) {
paddr = base_paddr + i;
retval = reserve_pfn_range(paddr, PAGE_SIZE, prot);
retval = reserve_pfn_range(paddr, PAGE_SIZE, prot, 0);
if (retval)
goto cleanup_ret;
}

12
arch/x86/pci/i386.c
View File

@ -314,17 +314,7 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
return retval;
if (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_MINUS &&
(new_flags == _PAGE_CACHE_WB)) ||
(flags == _PAGE_CACHE_WC &&
new_flags == _PAGE_CACHE_WB)) {
if (!is_new_memtype_allowed(flags, new_flags)) {
free_memtype(addr, addr+len);
return -EINVAL;
}

4
include/asm-generic/pgtable.h
View File

@ -301,7 +301,7 @@ static inline void ptep_modify_prot_commit(struct mm_struct *mm,
* track_pfn_vma_new is called when a _new_ pfn mapping is being established
* for physical range indicated by pfn and size.
*/
static inline int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t prot,
static inline int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t *prot,
unsigned long pfn, unsigned long size)
{
return 0;
@ -332,7 +332,7 @@ static inline void untrack_pfn_vma(struct vm_area_struct *vma,
{
}
#else
extern int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t prot,
extern int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t *prot,
unsigned long pfn, unsigned long size);
extern int track_pfn_vma_copy(struct vm_area_struct *vma);
extern void untrack_pfn_vma(struct vm_area_struct *vma, unsigned long pfn,

15
mm/memory.c
View File

@ -1511,6 +1511,7 @@ int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
unsigned long pfn)
{
int ret;
pgprot_t pgprot = vma->vm_page_prot;
/*
* Technically, architectures with pte_special can avoid all these
* restrictions (same for remap_pfn_range). However we would like
@ -1525,10 +1526,10 @@ int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
if (addr < vma->vm_start || addr >= vma->vm_end)
return -EFAULT;
if (track_pfn_vma_new(vma, vma->vm_page_prot, pfn, PAGE_SIZE))
if (track_pfn_vma_new(vma, &pgprot, pfn, PAGE_SIZE))
return -EINVAL;
ret = insert_pfn(vma, addr, pfn, vma->vm_page_prot);
ret = insert_pfn(vma, addr, pfn, pgprot);
if (ret)
untrack_pfn_vma(vma, pfn, PAGE_SIZE);
@ -1671,9 +1672,15 @@ int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr,
vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP;
err = track_pfn_vma_new(vma, prot, pfn, PAGE_ALIGN(size));
if (err)
err = track_pfn_vma_new(vma, &prot, pfn, PAGE_ALIGN(size));
if (err) {
/*
* To indicate that track_pfn related cleanup is not
* needed from higher level routine calling unmap_vmas
*/
vma->vm_flags &= ~(VM_IO | VM_RESERVED | VM_PFNMAP);
return -EINVAL;
}
BUG_ON(addr >= end);
pfn -= addr >> PAGE_SHIFT;