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powerpc/mm: use pte helpers in generic code

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Get rid of platform specific _PAGE_XXXX in powerpc common code and
use helpers instead.

mm/dump_linuxpagetables.c will be handled separately

Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy 2018-10-09 13:51:56 +00:00 committed by Michael Ellerman
parent 34eb138ed7
commit 26973fa5ac
7 changed files with 41 additions and 45 deletions
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9
arch/powerpc/include/asm/book3s/32/pgtable.h
View File

@ -331,17 +331,14 @@ static inline bool pte_ci(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 (!pte_present(pte) || !pte_user(pte) || !pte_read(pte))
return false;
if (write)
need_pte_bits |= _PAGE_WRITE;
if ((pteval & need_pte_bits) != need_pte_bits)
if (write && !pte_write(pte))
return false;
return true;

12
arch/powerpc/include/asm/nohash/32/pgtable.h
View File

@ -277,7 +277,10 @@ 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 +294,10 @@ 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);

3
arch/powerpc/include/asm/nohash/pgtable.h
View File

@ -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)

21
arch/powerpc/mm/pgtable.c
View File

@ -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 */
@ -191,10 +184,10 @@ void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
* Make sure hardware valid bit is not set. We don't do
* tlb flush for this update.
*/
VM_WARN_ON(pte_val(*ptep) & _PAGE_PRESENT);
VM_WARN_ON(pte_hw_valid(*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

15
arch/powerpc/mm/pgtable_32.c
View File

@ -112,15 +112,17 @@ EXPORT_SYMBOL(ioremap_coherent);
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, __pgprot(flags), __builtin_return_address(0));
return __ioremap_caller(addr, size, pte_pgprot(pte), __builtin_return_address(0));
}
EXPORT_SYMBOL(ioremap_prot);
@ -235,8 +237,7 @@ int map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot)
/* The PTE should never be already set nor present in the
* hash table
*/
BUG_ON((pte_val(*pg) & (_PAGE_PRESENT | _PAGE_HASHPTE)) &&
pgprot_val(prot));
BUG_ON((pte_present(*pg) | pte_hashpte(*pg)) && pgprot_val(prot));
set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT, prot));
}
smp_wmb();

14
arch/powerpc/mm/pgtable_64.c
View File

@ -230,23 +230,23 @@ void __iomem *ioremap_coherent(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, __pgprot(flags), caller);
return __ioremap_caller(addr, size, __pgprot(flags), caller);
return ppc_md.ioremap(addr, size, pte_pgprot(pte), caller);
return __ioremap_caller(addr, size, pte_pgprot(pte), caller);
}

12
arch/powerpc/xmon/xmon.c
View File

@ -2996,15 +2996,17 @@ 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)