@@ -43,7 +43,7 @@
#define PMD_SECT_BUFFERABLE (_AT(pmdval_t, 1) << 2)
#define PMD_SECT_CACHEABLE (_AT(pmdval_t, 1) << 3)
#define PMD_SECT_USER (_AT(pmdval_t, 1) << 6) /* AP[1] */
-#define PMD_SECT_RDONLY (_AT(pmdval_t, 1) << 7) /* AP[2] */
+#define PMD_SECT_AP2 (_AT(pmdval_t, 1) << 7) /* read only */
#define PMD_SECT_S (_AT(pmdval_t, 3) << 8)
#define PMD_SECT_AF (_AT(pmdval_t, 1) << 10)
#define PMD_SECT_nG (_AT(pmdval_t, 1) << 11)
@@ -72,6 +72,7 @@
#define PTE_TABLE_BIT (_AT(pteval_t, 1) << 1)
#define PTE_BUFFERABLE (_AT(pteval_t, 1) << 2) /* AttrIndx[0] */
#define PTE_CACHEABLE (_AT(pteval_t, 1) << 3) /* AttrIndx[1] */
+#define PTE_AP2 (_AT(pteval_t, 1) << 7) /* AP[2] */
#define PTE_EXT_SHARED (_AT(pteval_t, 3) << 8) /* SH[1:0], inner shareable */
#define PTE_EXT_AF (_AT(pteval_t, 1) << 10) /* Access Flag */
#define PTE_EXT_NG (_AT(pteval_t, 1) << 11) /* nG */
@@ -79,18 +79,19 @@
#define L_PTE_PRESENT (_AT(pteval_t, 3) << 0) /* Present */
#define L_PTE_FILE (_AT(pteval_t, 1) << 2) /* only when !PRESENT */
#define L_PTE_USER (_AT(pteval_t, 1) << 6) /* AP[1] */
-#define L_PTE_RDONLY (_AT(pteval_t, 1) << 7) /* AP[2] */
#define L_PTE_SHARED (_AT(pteval_t, 3) << 8) /* SH[1:0], inner shareable */
#define L_PTE_YOUNG (_AT(pteval_t, 1) << 10) /* AF */
#define L_PTE_XN (_AT(pteval_t, 1) << 54) /* XN */
-#define L_PTE_DIRTY (_AT(pteval_t, 1) << 55) /* unused */
-#define L_PTE_SPECIAL (_AT(pteval_t, 1) << 56) /* unused */
+#define L_PTE_DIRTY (_AT(pteval_t, 1) << 55)
+#define L_PTE_SPECIAL (_AT(pteval_t, 1) << 56)
#define L_PTE_NONE (_AT(pteval_t, 1) << 57) /* PROT_NONE */
+#define L_PTE_RDONLY (_AT(pteval_t, 1) << 58) /* READ ONLY */
-#define PMD_SECT_VALID (_AT(pmdval_t, 1) << 0)
-#define PMD_SECT_DIRTY (_AT(pmdval_t, 1) << 55)
-#define PMD_SECT_SPLITTING (_AT(pmdval_t, 1) << 56)
-#define PMD_SECT_NONE (_AT(pmdval_t, 1) << 57)
+#define L_PMD_SECT_VALID (_AT(pmdval_t, 1) << 0)
+#define L_PMD_SECT_DIRTY (_AT(pmdval_t, 1) << 55)
+#define L_PMD_SECT_SPLITTING (_AT(pmdval_t, 1) << 56)
+#define L_PMD_SECT_NONE (_AT(pmdval_t, 1) << 57)
+#define L_PMD_SECT_RDONLY (_AT(pteval_t, 1) << 58)
/*
* To be used in assembly code with the upper page attributes.
@@ -214,24 +215,25 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
#define pmd_young(pmd) (pmd_isset((pmd), PMD_SECT_AF))
#define __HAVE_ARCH_PMD_WRITE
-#define pmd_write(pmd) (pmd_isclear((pmd), PMD_SECT_RDONLY))
+#define pmd_write(pmd) (pmd_isclear((pmd), L_PMD_SECT_RDONLY))
+#define pmd_dirty(pmd) (pmd_isset((pmd), L_PMD_SECT_DIRTY))
#define pmd_hugewillfault(pmd) (!pmd_young(pmd) || !pmd_write(pmd))
#define pmd_thp_or_huge(pmd) (pmd_huge(pmd) || pmd_trans_huge(pmd))
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
#define pmd_trans_huge(pmd) (pmd_val(pmd) && !pmd_table(pmd))
-#define pmd_trans_splitting(pmd) (pmd_isset((pmd), PMD_SECT_SPLITTING))
+#define pmd_trans_splitting(pmd) (pmd_isset((pmd), L_PMD_SECT_SPLITTING))
#endif
#define PMD_BIT_FUNC(fn,op) \
static inline pmd_t pmd_##fn(pmd_t pmd) { pmd_val(pmd) op; return pmd; }
-PMD_BIT_FUNC(wrprotect, |= PMD_SECT_RDONLY);
+PMD_BIT_FUNC(wrprotect, |= L_PMD_SECT_RDONLY);
PMD_BIT_FUNC(mkold, &= ~PMD_SECT_AF);
-PMD_BIT_FUNC(mksplitting, |= PMD_SECT_SPLITTING);
-PMD_BIT_FUNC(mkwrite, &= ~PMD_SECT_RDONLY);
-PMD_BIT_FUNC(mkdirty, |= PMD_SECT_DIRTY);
+PMD_BIT_FUNC(mksplitting, |= L_PMD_SECT_SPLITTING);
+PMD_BIT_FUNC(mkwrite, &= ~L_PMD_SECT_RDONLY);
+PMD_BIT_FUNC(mkdirty, |= L_PMD_SECT_DIRTY);
PMD_BIT_FUNC(mkyoung, |= PMD_SECT_AF);
#define pmd_mkhuge(pmd) (__pmd(pmd_val(pmd) & ~PMD_TABLE_BIT))
@@ -245,8 +247,8 @@ PMD_BIT_FUNC(mkyoung, |= PMD_SECT_AF);
static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
{
- const pmdval_t mask = PMD_SECT_USER | PMD_SECT_XN | PMD_SECT_RDONLY |
- PMD_SECT_VALID | PMD_SECT_NONE;
+ const pmdval_t mask = PMD_SECT_USER | PMD_SECT_XN | L_PMD_SECT_RDONLY |
+ L_PMD_SECT_VALID | L_PMD_SECT_NONE;
pmd_val(pmd) = (pmd_val(pmd) & ~mask) | (pgprot_val(newprot) & mask);
return pmd;
}
@@ -257,8 +259,13 @@ static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
BUG_ON(addr >= TASK_SIZE);
/* create a faulting entry if PROT_NONE protected */
- if (pmd_val(pmd) & PMD_SECT_NONE)
- pmd_val(pmd) &= ~PMD_SECT_VALID;
+ if (pmd_val(pmd) & L_PMD_SECT_NONE)
+ pmd_val(pmd) &= ~L_PMD_SECT_VALID;
+
+ if (pmd_write(pmd) && pmd_dirty(pmd))
+ pmd_val(pmd) &= ~PMD_SECT_AP2;
+ else
+ pmd_val(pmd) |= PMD_SECT_AP2;
*pmdp = __pmd(pmd_val(pmd) | PMD_SECT_nG);
flush_pmd_entry(pmdp);
@@ -126,8 +126,8 @@ static const struct prot_bits section_bits[] = {
.val = PMD_SECT_USER,
.set = "USR",
}, {
- .mask = PMD_SECT_RDONLY,
- .val = PMD_SECT_RDONLY,
+ .mask = PMD_SECT_AP2,
+ .val = PMD_SECT_AP2,
.set = "ro",
.clear = "RW",
#elif __LINUX_ARM_ARCH__ >= 6
@@ -86,8 +86,13 @@ ENTRY(cpu_v7_set_pte_ext)
tst rh, #1 << (57 - 32) @ L_PTE_NONE
bicne rl, #L_PTE_VALID
bne 1f
- tst rh, #1 << (55 - 32) @ L_PTE_DIRTY
- orreq rl, #L_PTE_RDONLY
+
+ eor ip, rh, #1 << (55 - 32) @ toggle L_PTE_DIRTY in temp reg to
+ @ test for !L_PTE_DIRTY || L_PTE_RDONLY
+ tst ip, #1 << (55 - 32) | 1 << (58 - 32)
+ orrne rl, #PTE_AP2
+ biceq rl, #PTE_AP2
+
1: strd r2, r3, [r0]
ALT_SMP(W(nop))
ALT_UP (mcr p15, 0, r0, c7, c10, 1) @ flush_pte
For LPAE, we have the following means for encoding writable or dirty ptes: L_PTE_DIRTY L_PTE_RDONLY !pte_dirty && !pte_write 0 1 !pte_dirty && pte_write 0 1 pte_dirty && !pte_write 1 1 pte_dirty && pte_write 1 0 So we can't distinguish between writeable clean ptes and read only ptes. This can cause problems with ptes being incorrectly flagged as read only when they are writeable but not dirty. This patch renumbers L_PTE_RDONLY from AP[2] to a software bit #58, and adds additional logic to set AP[2] whenever the pte is read only or not dirty. That way we can distinguish between clean writeable ptes and read only ptes. HugeTLB pages will use this new logic automatically. We need to add some logic to Transparent HugePages to ensure that they correctly interpret the revised pgprot permissions (L_PTE_RDONLY has moved and no longer matches PMD_SECT_AP2). In the process of revising THP, the names of the PMD software bits have been prefixed with L_ to make them easier to distinguish from their hardware bit counterparts. Signed-off-by: Steve Capper <steve.capper@linaro.org> --- arch/arm/include/asm/pgtable-3level-hwdef.h | 3 ++- arch/arm/include/asm/pgtable-3level.h | 41 +++++++++++++++++------------ arch/arm/mm/dump.c | 4 +-- arch/arm/mm/proc-v7-3level.S | 9 +++++-- 4 files changed, 35 insertions(+), 22 deletions(-)