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Subject[RFC PATCH v1 06/17] powerpc/mm: use pte helpers in generic code
Date
Get rid of platform specific _PAGE_XXXX in powerpc code code and
use helpers instead.

mm/dump_linuxpagetables.c will be handled separately

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/include/asm/book3s/32/pgtable.h | 9 +++------
arch/powerpc/include/asm/nohash/32/pgtable.h | 13 +++++++++----
arch/powerpc/include/asm/nohash/pgtable.h | 3 +--
arch/powerpc/mm/mem.c | 2 +-
arch/powerpc/mm/pgtable.c | 19 ++++++-------------
arch/powerpc/mm/pgtable_32.c | 26 ++++++++++++++------------
arch/powerpc/mm/pgtable_64.c | 21 +++++++++++----------
arch/powerpc/xmon/xmon.c | 12 +++++++-----
8 files changed, 52 insertions(+), 53 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/32/pgtable.h b/arch/powerpc/include/asm/book3s/32/pgtable.h
index daebb4cde626..90991dce63e9 100644
--- a/arch/powerpc/include/asm/book3s/32/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/32/pgtable.h
@@ -318,17 +318,14 @@ static inline int pte_present(pte_t pte)
#define pte_access_permitted pte_access_permitted
static inline bool pte_access_permitted(pte_t pte, bool write)
{
- unsigned long pteval = pte_val(pte);
/*
* A read-only access is controlled by _PAGE_USER bit.
* We have _PAGE_READ set for WRITE and EXECUTE
*/
- unsigned long need_pte_bits = _PAGE_PRESENT | _PAGE_USER;
-
- if (write)
- need_pte_bits |= _PAGE_WRITE;
+ if (!pte_present(pte) || !pte_user(pte) || !pte_read(pte))
+ return false;

- if ((pteval & need_pte_bits) != need_pte_bits)
+ if (write && !pte_write(pte))
return false;

return true;
diff --git a/arch/powerpc/include/asm/nohash/32/pgtable.h b/arch/powerpc/include/asm/nohash/32/pgtable.h
index 3be2109719ed..4fab3a7d764b 100644
--- a/arch/powerpc/include/asm/nohash/32/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/32/pgtable.h
@@ -277,8 +277,12 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
pte_t *ptep)
{
- pte_update(ptep, (_PAGE_RW | _PAGE_HWWRITE), _PAGE_RO);
+ unsigned long clr = ~pte_val(pte_wrprotect(__pte(~0)));
+ unsigned long set = pte_val(pte_wrprotect(__pte(0)));
+
+ pte_update(ptep, clr, set);
}
+
static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
unsigned long addr, pte_t *ptep)
{
@@ -291,9 +295,10 @@ static inline void __ptep_set_access_flags(struct vm_area_struct *vma,
unsigned long address,
int psize)
{
- unsigned long set = pte_val(entry) &
- (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC);
- unsigned long clr = ~pte_val(entry) & (_PAGE_RO | _PAGE_NA);
+ pte_t pte_set = pte_mkyoung(pte_mkdirty(pte_mkwrite(pte_mkexec(__pte(0)))));
+ pte_t pte_clr = pte_mkyoung(pte_mkdirty(pte_mkwrite(pte_mkexec(__pte(~0)))));
+ unsigned long set = pte_val(entry) & pte_val(pte_set);
+ unsigned long clr = ~pte_val(entry) & ~pte_val(pte_clr);

pte_update(ptep, clr, set);

diff --git a/arch/powerpc/include/asm/nohash/pgtable.h b/arch/powerpc/include/asm/nohash/pgtable.h
index 49417b8b49e9..0c63d10b8631 100644
--- a/arch/powerpc/include/asm/nohash/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/pgtable.h
@@ -32,8 +32,7 @@ static inline pgprot_t pte_pgprot(pte_t pte) { return __pgprot(pte_val(pte) & PA
*/
static inline int pte_protnone(pte_t pte)
{
- return (pte_val(pte) &
- (_PAGE_PRESENT | _PAGE_USER)) == _PAGE_PRESENT;
+ return pte_present(pte) && !pte_user(pte);
}

static inline int pmd_protnone(pmd_t pmd)
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 5c8530d0c611..24b2ddba0d4d 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -532,7 +532,7 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
access = 0UL;
break;
case 0x400:
- access = _PAGE_EXEC;
+ access = pte_val(pte_mkexec(__pte(0)));
break;
default:
return;
diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c
index 4f788f3762a9..8558f01ed5c8 100644
--- a/arch/powerpc/mm/pgtable.c
+++ b/arch/powerpc/mm/pgtable.c
@@ -44,20 +44,13 @@ static inline int is_exec_fault(void)
static inline int pte_looks_normal(pte_t pte)
{

-#if defined(CONFIG_PPC_BOOK3S_64)
- if ((pte_val(pte) & (_PAGE_PRESENT | _PAGE_SPECIAL)) == _PAGE_PRESENT) {
+ if (pte_present(pte) && !pte_special(pte)) {
if (pte_ci(pte))
return 0;
if (pte_user(pte))
return 1;
}
return 0;
-#else
- return (pte_val(pte) &
- (_PAGE_PRESENT | _PAGE_SPECIAL | _PAGE_NO_CACHE | _PAGE_USER |
- _PAGE_PRIVILEGED)) ==
- (_PAGE_PRESENT | _PAGE_USER);
-#endif
}

static struct page *maybe_pte_to_page(pte_t pte)
@@ -117,7 +110,7 @@ static pte_t set_pte_filter(pte_t pte)
struct page *pg;

/* No exec permission in the first place, move on */
- if (!(pte_val(pte) & _PAGE_EXEC) || !pte_looks_normal(pte))
+ if (!pte_exec(pte) || !pte_looks_normal(pte))
return pte;

/* If you set _PAGE_EXEC on weird pages you're on your own */
@@ -137,7 +130,7 @@ static pte_t set_pte_filter(pte_t pte)
}

/* Else, we filter out _PAGE_EXEC */
- return __pte(pte_val(pte) & ~_PAGE_EXEC);
+ return pte_exprotect(pte);
}

static pte_t set_access_flags_filter(pte_t pte, struct vm_area_struct *vma,
@@ -150,7 +143,7 @@ static pte_t set_access_flags_filter(pte_t pte, struct vm_area_struct *vma,
* if necessary. Also if _PAGE_EXEC is already set, same deal,
* we just bail out
*/
- if (dirty || (pte_val(pte) & _PAGE_EXEC) || !is_exec_fault())
+ if (dirty || pte_exec(pte) || !is_exec_fault())
return pte;

#ifdef CONFIG_DEBUG_VM
@@ -176,7 +169,7 @@ static pte_t set_access_flags_filter(pte_t pte, struct vm_area_struct *vma,
set_bit(PG_arch_1, &pg->flags);

bail:
- return __pte(pte_val(pte) | _PAGE_EXEC);
+ return pte_mkexec(pte);
}

#endif /* CONFIG_PPC_BOOK3S */
@@ -195,7 +188,7 @@ void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
VM_WARN_ON(pte_present(*ptep) && !pte_protnone(*ptep));

/* Add the pte bit when trying to set a pte */
- pte = __pte(pte_val(pte) | _PAGE_PTE);
+ pte = pte_mkpte(pte);

/* Note: mm->context.id might not yet have been assigned as
* this context might not have been activated yet when this
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index f983ffa24aa0..4ed4c663f77a 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -103,15 +103,17 @@ EXPORT_SYMBOL(ioremap_wt);
void __iomem *
ioremap_prot(phys_addr_t addr, unsigned long size, unsigned long flags)
{
+ pte_t pte = __pte(flags);
+
/* writeable implies dirty for kernel addresses */
- if ((flags & (_PAGE_RW | _PAGE_RO)) != _PAGE_RO)
- flags |= _PAGE_DIRTY | _PAGE_HWWRITE;
+ if (pte_write(pte))
+ pte = pte_mkdirty(pte);

/* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */
- flags &= ~(_PAGE_USER | _PAGE_EXEC);
- flags |= _PAGE_PRIVILEGED;
+ pte = pte_exprotect(pte);
+ pte = pte_mkprivileged(pte);

- return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
+ return __ioremap_caller(addr, size, pte_val(pte), __builtin_return_address(0));
}
EXPORT_SYMBOL(ioremap_prot);

@@ -128,14 +130,15 @@ __ioremap_caller(phys_addr_t addr, unsigned long size, unsigned long flags,
unsigned long v, i;
phys_addr_t p;
int err;
+ pte_t pte = __pte(flags);

/* Make sure we have the base flags */
- if ((flags & _PAGE_PRESENT) == 0)
- flags |= pgprot_val(PAGE_KERNEL);
+ if (!pte_present(pte))
+ pte = __pte(pte_val(pte) | pgprot_val(PAGE_KERNEL));

/* Non-cacheable page cannot be coherent */
- if (flags & _PAGE_NO_CACHE)
- flags &= ~_PAGE_COHERENT;
+ if (pte_ci(pte))
+ pte = pte_mknoncoherent(pte);

/*
* Choose an address to map it to.
@@ -194,7 +197,7 @@ __ioremap_caller(phys_addr_t addr, unsigned long size, unsigned long flags,

err = 0;
for (i = 0; i < size && err == 0; i += PAGE_SIZE)
- err = map_kernel_page(v+i, p+i, flags);
+ err = map_kernel_page(v + i, p + i, pte_val(pte));
if (err) {
if (slab_is_available())
vunmap((void *)v);
@@ -235,8 +238,7 @@ int map_kernel_page(unsigned long va, phys_addr_t pa, int flags)
/* The PTE should never be already set nor present in the
* hash table
*/
- BUG_ON((pte_val(*pg) & (_PAGE_PRESENT | _PAGE_HASHPTE)) &&
- flags);
+ BUG_ON((pte_present(*pg) | pte_hashpte(*pg)) && flags);
set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT,
__pgprot(flags)));
}
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index 53e9eeecd5d4..3fff1c21b65d 100644
--- a/arch/powerpc/mm/pgtable_64.c
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -117,10 +117,11 @@ void __iomem * __ioremap_at(phys_addr_t pa, void *ea, unsigned long size,
unsigned long flags)
{
unsigned long i;
+ pte_t pte = __pte(flags);

/* Make sure we have the base flags */
- if ((flags & _PAGE_PRESENT) == 0)
- flags |= pgprot_val(PAGE_KERNEL);
+ if (!pte_present(pte))
+ pte = __pte(pte_val(pte) | pgprot_val(PAGE_KERNEL));

/* We don't support the 4K PFN hack with ioremap */
if (flags & H_PAGE_4K_PFN)
@@ -131,7 +132,7 @@ void __iomem * __ioremap_at(phys_addr_t pa, void *ea, unsigned long size,
WARN_ON(size & ~PAGE_MASK);

for (i = 0; i < size; i += PAGE_SIZE)
- if (map_kernel_page((unsigned long)ea+i, pa+i, flags))
+ if (map_kernel_page((unsigned long)ea + i, pa + i, pte_val(pte)))
return NULL;

return (void __iomem *)ea;
@@ -225,23 +226,23 @@ void __iomem * ioremap_wc(phys_addr_t addr, unsigned long size)
void __iomem * ioremap_prot(phys_addr_t addr, unsigned long size,
unsigned long flags)
{
+ pte_t pte = __pte(flags);
void *caller = __builtin_return_address(0);

/* writeable implies dirty for kernel addresses */
- if (flags & _PAGE_WRITE)
- flags |= _PAGE_DIRTY;
+ if (pte_write(pte))
+ pte = pte_mkdirty(pte);

/* we don't want to let _PAGE_EXEC leak out */
- flags &= ~_PAGE_EXEC;
+ pte = pte_exprotect(pte);
/*
* Force kernel mapping.
*/
- flags &= ~_PAGE_USER;
- flags |= _PAGE_PRIVILEGED;
+ pte = pte_mkprivileged(pte);

if (ppc_md.ioremap)
- return ppc_md.ioremap(addr, size, flags, caller);
- return __ioremap_caller(addr, size, flags, caller);
+ return ppc_md.ioremap(addr, size, pte_val(pte), caller);
+ return __ioremap_caller(addr, size, pte_val(pte), caller);
}


diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 4264aedc7775..f65f2f38c441 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -2988,15 +2988,17 @@ static void show_task(struct task_struct *tsk)
#ifdef CONFIG_PPC_BOOK3S_64
void format_pte(void *ptep, unsigned long pte)
{
+ pte_t entry = __pte(pte);
+
printf("ptep @ 0x%016lx = 0x%016lx\n", (unsigned long)ptep, pte);
printf("Maps physical address = 0x%016lx\n", pte & PTE_RPN_MASK);

printf("Flags = %s%s%s%s%s\n",
- (pte & _PAGE_ACCESSED) ? "Accessed " : "",
- (pte & _PAGE_DIRTY) ? "Dirty " : "",
- (pte & _PAGE_READ) ? "Read " : "",
- (pte & _PAGE_WRITE) ? "Write " : "",
- (pte & _PAGE_EXEC) ? "Exec " : "");
+ pte_young(entry) ? "Accessed " : "",
+ pte_dirty(entry) ? "Dirty " : "",
+ pte_read(entry) ? "Read " : "",
+ pte_write(entry) ? "Write " : "",
+ pte_exec(entry) ? "Exec " : "");
}

static void show_pte(unsigned long addr)
--
2.13.3
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