powerpc/mm: Use _PAGE_READ to indicate Read access

This splits the _PAGE_RW bit into _PAGE_READ and _PAGE_WRITE. It also
removes the dependency on _PAGE_USER for implying read only. Few things
to note here is that, we have read implied with write and execute
permission. Hence we should always find _PAGE_READ set on hash pte
fault.

We still can't switch PROT_NONE to !(_PAGE_RWX). Auto numa depends on
marking a prot none pte _PAGE_WRITE. (For more details look at
b191f9b106ea "mm: numa: preserve PTE write permissions across a NUMA
hinting fault")

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Jeremy Kerr <jk@ozlabs.org>
Cc: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/include/asm/book3s/64/hash-64k.h b/arch/powerpc/include/asm/book3s/64/hash-64k.h
index f4949f1..f465050 100644 (file)
--- a/arch/powerpc/include/asm/book3s/64/hash-64k.h
+++ b/arch/powerpc/include/asm/book3s/64/hash-64k.h
@@ -291,10 +291,10 @@ static inline void pmdp_set_wrprotect(struct mm_struct *mm, unsigned long addr,
                                      pmd_t *pmdp)
 {
 
-       if ((pmd_val(*pmdp) & _PAGE_RW) == 0)
+       if ((pmd_val(*pmdp) & _PAGE_WRITE) == 0)
                return;
 
-       pmd_hugepage_update(mm, addr, pmdp, _PAGE_RW, 0);
+       pmd_hugepage_update(mm, addr, pmdp, _PAGE_WRITE, 0);
 }
 
 #endif /*  CONFIG_TRANSPARENT_HUGEPAGE */

diff --git a/arch/powerpc/include/asm/book3s/64/hash.h b/arch/powerpc/include/asm/book3s/64/hash.h
index 22064bd..fb76f9c 100644 (file)
--- a/arch/powerpc/include/asm/book3s/64/hash.h
+++ b/arch/powerpc/include/asm/book3s/64/hash.h
@@ -16,8 +16,10 @@
 #define _PAGE_BIT_SWAP_TYPE    0
 
 #define _PAGE_EXEC             0x00001 /* execute permission */
-#define _PAGE_RW               0x00002 /* read & write access allowed */
+#define _PAGE_WRITE            0x00002 /* write access allowed */
 #define _PAGE_READ             0x00004 /* read access allowed */
+#define _PAGE_RW               (_PAGE_READ | _PAGE_WRITE)
+#define _PAGE_RWX              (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC)
 #define _PAGE_USER             0x00008 /* page may be accessed by userspace */
 #define _PAGE_GUARDED          0x00010 /* G: guarded (side-effect) page */
 /* M (memory coherence) is always set in the HPTE, so we don't need it here */
@@ -145,8 +147,8 @@
  */
 #define PAGE_PROT_BITS (_PAGE_GUARDED | _PAGE_COHERENT | _PAGE_NO_CACHE | \
                         _PAGE_WRITETHRU | _PAGE_4K_PFN | \
-                        _PAGE_USER | _PAGE_ACCESSED |  \
-                        _PAGE_RW |  _PAGE_DIRTY | _PAGE_EXEC | \
+                        _PAGE_USER | _PAGE_ACCESSED |  _PAGE_READ |\
+                        _PAGE_WRITE |  _PAGE_DIRTY | _PAGE_EXEC | \
                         _PAGE_SOFT_DIRTY)
 /*
  * We define 2 sets of base prot bits, one for basic pages (ie,
@@ -171,10 +173,12 @@
 #define PAGE_SHARED    __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW)
 #define PAGE_SHARED_X  __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | \
                                 _PAGE_EXEC)
-#define PAGE_COPY      __pgprot(_PAGE_BASE | _PAGE_USER )
-#define PAGE_COPY_X    __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
-#define PAGE_READONLY  __pgprot(_PAGE_BASE | _PAGE_USER )
-#define PAGE_READONLY_X        __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
+#define PAGE_COPY      __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_READ)
+#define PAGE_COPY_X    __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_READ| \
+                                _PAGE_EXEC)
+#define PAGE_READONLY  __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_READ)
+#define PAGE_READONLY_X        __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_READ| \
+                                _PAGE_EXEC)
 
 #define __P000 PAGE_NONE
 #define __P001 PAGE_READONLY
@@ -296,19 +300,19 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
                                      pte_t *ptep)
 {
 
-       if ((pte_val(*ptep) & _PAGE_RW) == 0)
+       if ((pte_val(*ptep) & _PAGE_WRITE) == 0)
                return;
 
-       pte_update(mm, addr, ptep, _PAGE_RW, 0, 0);
+       pte_update(mm, addr, ptep, _PAGE_WRITE, 0, 0);
 }
 
 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
                                           unsigned long addr, pte_t *ptep)
 {
-       if ((pte_val(*ptep) & _PAGE_RW) == 0)
+       if ((pte_val(*ptep) & _PAGE_WRITE) == 0)
                return;
 
-       pte_update(mm, addr, ptep, _PAGE_RW, 0, 1);
+       pte_update(mm, addr, ptep, _PAGE_WRITE, 0, 1);
 }
 
 /*
@@ -349,7 +353,7 @@ static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry)
 {
        __be64 old, tmp, val, mask;
 
-       mask = cpu_to_be64(_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW |
+       mask = cpu_to_be64(_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_READ | _PAGE_WRITE |
                           _PAGE_EXEC | _PAGE_SOFT_DIRTY);
 
        val = pte_raw(entry) & mask;
@@ -384,7 +388,7 @@ static inline unsigned long pgd_page_vaddr(pgd_t pgd)
 
 
 /* Generic accessors to PTE bits */
-static inline int pte_write(pte_t pte)         { return !!(pte_val(pte) & _PAGE_RW);}
+static inline int pte_write(pte_t pte)         { return !!(pte_val(pte) & _PAGE_WRITE);}
 static inline int pte_dirty(pte_t pte)         { return !!(pte_val(pte) & _PAGE_DIRTY); }
 static inline int pte_young(pte_t pte)         { return !!(pte_val(pte) & _PAGE_ACCESSED); }
 static inline int pte_special(pte_t pte)       { return !!(pte_val(pte) & _PAGE_SPECIAL); }
@@ -445,7 +449,7 @@ static inline unsigned long pte_pfn(pte_t pte)
 /* Generic modifiers for PTE bits */
 static inline pte_t pte_wrprotect(pte_t pte)
 {
-       return __pte(pte_val(pte) & ~_PAGE_RW);
+       return __pte(pte_val(pte) & ~_PAGE_WRITE);
 }
 
 static inline pte_t pte_mkclean(pte_t pte)
@@ -460,6 +464,9 @@ static inline pte_t pte_mkold(pte_t pte)
 
 static inline pte_t pte_mkwrite(pte_t pte)
 {
+       /*
+        * write implies read, hence set both
+        */
        return __pte(pte_val(pte) | _PAGE_RW);
 }
 

diff --git a/arch/powerpc/include/asm/pte-common.h b/arch/powerpc/include/asm/pte-common.h
index 1ec67b0..9f5dea5 100644 (file)
--- a/arch/powerpc/include/asm/pte-common.h
+++ b/arch/powerpc/include/asm/pte-common.h
@@ -198,3 +198,8 @@ extern unsigned long bad_call_to_PMD_PAGE_SIZE(void);
 /* Advertise support for _PAGE_SPECIAL */
 #define __HAVE_ARCH_PTE_SPECIAL
 
+#ifndef _PAGE_READ
+/* if not defined, we should not find _PAGE_WRITE too */
+#define _PAGE_READ 0
+#define _PAGE_WRITE _PAGE_RW
+#endif

diff --git a/arch/powerpc/mm/hash64_4k.c b/arch/powerpc/mm/hash64_4k.c
index dbd3133..491b7d1 100644 (file)
--- a/arch/powerpc/mm/hash64_4k.c
+++ b/arch/powerpc/mm/hash64_4k.c
@@ -45,7 +45,7 @@ int __hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid,
                 * also add _PAGE_COMBO
                 */
                new_pte = old_pte | _PAGE_BUSY | _PAGE_ACCESSED;
-               if (access & _PAGE_RW)
+               if (access & _PAGE_WRITE)
                        new_pte |= _PAGE_DIRTY;
        } while (!pte_xchg(ptep, __pte(old_pte), __pte(new_pte)));
 

diff --git a/arch/powerpc/mm/hash64_64k.c b/arch/powerpc/mm/hash64_64k.c
index 292f407..2d34721 100644 (file)
--- a/arch/powerpc/mm/hash64_64k.c
+++ b/arch/powerpc/mm/hash64_64k.c
@@ -77,7 +77,7 @@ int __hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid,
                 * also add _PAGE_COMBO
                 */
                new_pte = old_pte | _PAGE_BUSY | _PAGE_ACCESSED | _PAGE_COMBO;
-               if (access & _PAGE_RW)
+               if (access & _PAGE_WRITE)
                        new_pte |= _PAGE_DIRTY;
        } while (!pte_xchg(ptep, __pte(old_pte), __pte(new_pte)));
 
@@ -251,7 +251,7 @@ int __hash_page_64K(unsigned long ea, unsigned long access,
                 * a write access.
                 */
                new_pte = old_pte | _PAGE_BUSY | _PAGE_ACCESSED;
-               if (access & _PAGE_RW)
+               if (access & _PAGE_WRITE)
                        new_pte |= _PAGE_DIRTY;
        } while (!pte_xchg(ptep, __pte(old_pte), __pte(new_pte)));
 

diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index 7635b1c..ed190e4 100644 (file)
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -175,8 +175,9 @@ unsigned long htab_convert_pte_flags(unsigned long pteflags)
         * or PP=0x3 for read-only (including writeable but clean pages).
         */
        if (pteflags & _PAGE_USER) {
-               rflags |= 0x2;
-               if (!((pteflags & _PAGE_RW) && (pteflags & _PAGE_DIRTY)))
+               if (pteflags & _PAGE_RWX)
+                       rflags |= 0x2;
+               if (!((pteflags & _PAGE_WRITE) && (pteflags & _PAGE_DIRTY)))
                        rflags |= 0x1;
        }
        /*
@@ -1209,7 +1210,7 @@ EXPORT_SYMBOL_GPL(hash_page);
 int __hash_page(unsigned long ea, unsigned long msr, unsigned long trap,
                unsigned long dsisr)
 {
-       unsigned long access = _PAGE_PRESENT;
+       unsigned long access = _PAGE_PRESENT | _PAGE_READ;
        unsigned long flags = 0;
        struct mm_struct *mm = current->mm;
 
@@ -1220,7 +1221,7 @@ int __hash_page(unsigned long ea, unsigned long msr, unsigned long trap,
                flags |= HPTE_NOHPTE_UPDATE;
 
        if (dsisr & DSISR_ISSTORE)
-               access |= _PAGE_RW;
+               access |= _PAGE_WRITE;
        /*
         * We need to set the _PAGE_USER bit if MSR_PR is set or if we are
         * accessing a userspace segment (even from the kernel). We assume

diff --git a/arch/powerpc/mm/hugepage-hash64.c b/arch/powerpc/mm/hugepage-hash64.c
index 92c3c18..b4b6668 100644 (file)
--- a/arch/powerpc/mm/hugepage-hash64.c
+++ b/arch/powerpc/mm/hugepage-hash64.c
@@ -47,7 +47,7 @@ int __hash_page_thp(unsigned long ea, unsigned long access, unsigned long vsid,
                 * a write access
                 */
                new_pmd = old_pmd | _PAGE_BUSY | _PAGE_ACCESSED;
-               if (access & _PAGE_RW)
+               if (access & _PAGE_WRITE)
                        new_pmd |= _PAGE_DIRTY;
        } while (!pmd_xchg(pmdp, __pmd(old_pmd), __pmd(new_pmd)));
 

diff --git a/arch/powerpc/mm/hugetlbpage-hash64.c b/arch/powerpc/mm/hugetlbpage-hash64.c
index 9c05187..cdca743 100644 (file)
--- a/arch/powerpc/mm/hugetlbpage-hash64.c
+++ b/arch/powerpc/mm/hugetlbpage-hash64.c
@@ -55,7 +55,7 @@ int __hash_page_huge(unsigned long ea, unsigned long access, unsigned long vsid,
                /* Try to lock the PTE, add ACCESSED and DIRTY if it was
                 * a write access */
                new_pte = old_pte | _PAGE_BUSY | _PAGE_ACCESSED;
-               if (access & _PAGE_RW)
+               if (access & _PAGE_WRITE)
                        new_pte |= _PAGE_DIRTY;
        } while(!pte_xchg(ptep, __pte(old_pte), __pte(new_pte)));
 

diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index d991b9e..0bf269b 100644 (file)
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -1003,9 +1003,9 @@ int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr,
                end = pte_end;
 
        pte = READ_ONCE(*ptep);
-       mask = _PAGE_PRESENT | _PAGE_USER;
+       mask = _PAGE_PRESENT | _PAGE_USER | _PAGE_READ;
        if (write)
-               mask |= _PAGE_RW;
+               mask |= _PAGE_WRITE;
 
        if ((pte_val(pte) & mask) != mask)
                return 0;

diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c
index de37ff4..ef7b922 100644 (file)
--- a/arch/powerpc/mm/pgtable.c
+++ b/arch/powerpc/mm/pgtable.c
@@ -177,8 +177,8 @@ void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
         * _PAGE_PRESENT, but we can be sure that it is not in hpte.
         * Hence we can use set_pte_at for them.
         */
-       VM_WARN_ON((pte_val(*ptep) & (_PAGE_PRESENT | _PAGE_USER)) ==
-               (_PAGE_PRESENT | _PAGE_USER));
+       VM_WARN_ON(pte_present(*ptep) && !pte_protnone(*ptep));
+
        /*
         * Add the pte bit when tryint set a pte
         */

diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index 494fc11..16bc751 100644 (file)
--- a/arch/powerpc/mm/pgtable_64.c
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -277,7 +277,7 @@ void __iomem * ioremap_prot(phys_addr_t addr, unsigned long size,
        void *caller = __builtin_return_address(0);
 
        /* writeable implies dirty for kernel addresses */
-       if (flags & _PAGE_RW)
+       if (flags & _PAGE_WRITE)
                flags |= _PAGE_DIRTY;
 
        /* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */
@@ -676,8 +676,7 @@ void set_pmd_at(struct mm_struct *mm, unsigned long addr,
                pmd_t *pmdp, pmd_t pmd)
 {
 #ifdef CONFIG_DEBUG_VM
-       WARN_ON((pmd_val(*pmdp) & (_PAGE_PRESENT | _PAGE_USER)) ==
-               (_PAGE_PRESENT | _PAGE_USER));
+       WARN_ON(pte_present(pmd_pte(*pmdp)) && !pte_protnone(pmd_pte(*pmdp)));
        assert_spin_locked(&mm->page_table_lock);
        WARN_ON(!pmd_trans_huge(pmd));
 #endif

diff --git a/arch/powerpc/platforms/cell/spu_base.c b/arch/powerpc/platforms/cell/spu_base.c
index 3ede04f..3cbe38f 100644 (file)
--- a/arch/powerpc/platforms/cell/spu_base.c
+++ b/arch/powerpc/platforms/cell/spu_base.c
@@ -197,7 +197,7 @@ static int __spu_trap_data_map(struct spu *spu, unsigned long ea, u64 dsisr)
            (REGION_ID(ea) != USER_REGION_ID)) {
 
                spin_unlock(&spu->register_lock);
-               ret = hash_page(ea, _PAGE_PRESENT, 0x300, dsisr);
+               ret = hash_page(ea, _PAGE_PRESENT | _PAGE_READ, 0x300, dsisr);
                spin_lock(&spu->register_lock);
 
                if (!ret) {

diff --git a/arch/powerpc/platforms/cell/spufs/fault.c b/arch/powerpc/platforms/cell/spufs/fault.c
index d98f845..c3a3bf1 100644 (file)
--- a/arch/powerpc/platforms/cell/spufs/fault.c
+++ b/arch/powerpc/platforms/cell/spufs/fault.c
@@ -141,8 +141,8 @@ int spufs_handle_class1(struct spu_context *ctx)
        /* we must not hold the lock when entering copro_handle_mm_fault */
        spu_release(ctx);
 
-       access = (_PAGE_PRESENT | _PAGE_USER);
-       access |= (dsisr & MFC_DSISR_ACCESS_PUT) ? _PAGE_RW : 0UL;
+       access = (_PAGE_PRESENT | _PAGE_READ | _PAGE_USER);
+       access |= (dsisr & MFC_DSISR_ACCESS_PUT) ? _PAGE_WRITE : 0UL;
        local_irq_save(flags);
        ret = hash_page(ea, access, 0x300, dsisr);
        local_irq_restore(flags);

diff --git a/drivers/misc/cxl/fault.c b/drivers/misc/cxl/fault.c
index 9a23654..0feeace 100644 (file)
--- a/drivers/misc/cxl/fault.c
+++ b/drivers/misc/cxl/fault.c
@@ -149,9 +149,9 @@ static void cxl_handle_page_fault(struct cxl_context *ctx,
         * update_mmu_cache() will not have loaded the hash since current->trap
         * is not a 0x400 or 0x300, so just call hash_page_mm() here.
         */
-       access = _PAGE_PRESENT;
+       access = _PAGE_PRESENT | _PAGE_READ;
        if (dsisr & CXL_PSL_DSISR_An_S)
-               access |= _PAGE_RW;
+               access |= _PAGE_WRITE;
        if ((!ctx->kernel) || (REGION_ID(dar) == USER_REGION_ID))
                access |= _PAGE_USER;