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Subject[PATCH v2 07/20] ARM: LPAE: Page table maintenance for the 3-level format
Date
This patch modifies the pgd/pmd/pte manipulation functions to support
the 3-level page table format. Since there is no need for an 'ext'
argument to cpu_set_pte_ext(), this patch conditionally defines a
different prototype for this function when CONFIG_ARM_LPAE.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---
arch/arm/include/asm/cpu-multi32.h | 8 ++++
arch/arm/include/asm/cpu-single.h | 4 ++
arch/arm/include/asm/pgalloc.h | 26 ++++++++++++-
arch/arm/include/asm/pgtable.h | 72 ++++++++++++++++++++++++++++++++++++
arch/arm/include/asm/proc-fns.h | 13 ++++++
arch/arm/mm/ioremap.c | 8 ++-
arch/arm/mm/pgd.c | 18 +++++++--
arch/arm/mm/proc-v7.S | 8 ++++
8 files changed, 149 insertions(+), 8 deletions(-)

diff --git a/arch/arm/include/asm/cpu-multi32.h b/arch/arm/include/asm/cpu-multi32.h
index e2b5b0b..985fcf5 100644
--- a/arch/arm/include/asm/cpu-multi32.h
+++ b/arch/arm/include/asm/cpu-multi32.h
@@ -57,7 +57,11 @@ extern struct processor {
* Set a possibly extended PTE. Non-extended PTEs should
* ignore 'ext'.
*/
+#ifdef CONFIG_ARM_LPAE
+ void (*set_pte_ext)(pte_t *ptep, pte_t pte);
+#else
void (*set_pte_ext)(pte_t *ptep, pte_t pte, unsigned int ext);
+#endif
} processor;

#define cpu_proc_init() processor._proc_init()
@@ -65,5 +69,9 @@ extern struct processor {
#define cpu_reset(addr) processor.reset(addr)
#define cpu_do_idle() processor._do_idle()
#define cpu_dcache_clean_area(addr,sz) processor.dcache_clean_area(addr,sz)
+#ifdef CONFIG_ARM_LPAE
+#define cpu_set_pte_ext(ptep,pte) processor.set_pte_ext(ptep,pte)
+#else
#define cpu_set_pte_ext(ptep,pte,ext) processor.set_pte_ext(ptep,pte,ext)
+#endif
#define cpu_do_switch_mm(pgd,mm) processor.switch_mm(pgd,mm)
diff --git a/arch/arm/include/asm/cpu-single.h b/arch/arm/include/asm/cpu-single.h
index f073a6d..f436df2 100644
--- a/arch/arm/include/asm/cpu-single.h
+++ b/arch/arm/include/asm/cpu-single.h
@@ -40,5 +40,9 @@ extern void cpu_proc_fin(void);
extern int cpu_do_idle(void);
extern void cpu_dcache_clean_area(void *, int);
extern void cpu_do_switch_mm(unsigned long pgd_phys, struct mm_struct *mm);
+#ifdef CONFIG_ARM_LPAE
+extern void cpu_set_pte_ext(pte_t *ptep, pte_t pte);
+#else
extern void cpu_set_pte_ext(pte_t *ptep, pte_t pte, unsigned int ext);
+#endif
extern void cpu_reset(unsigned long addr) __attribute__((noreturn));
diff --git a/arch/arm/include/asm/pgalloc.h b/arch/arm/include/asm/pgalloc.h
index c2a1f64..64a303d 100644
--- a/arch/arm/include/asm/pgalloc.h
+++ b/arch/arm/include/asm/pgalloc.h
@@ -23,6 +23,26 @@
#define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_USER))
#define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_KERNEL))

+#ifdef CONFIG_ARM_LPAE
+
+static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
+{
+ return (pmd_t *)get_zeroed_page(GFP_KERNEL | __GFP_REPEAT);
+}
+
+static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
+{
+ BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
+ free_page((unsigned long)pmd);
+}
+
+static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
+{
+ set_pgd(pgd, __pgd(__pa(pmd) | PMD_TYPE_TABLE));
+}
+
+#else /* !CONFIG_ARM_LPAE */
+
/*
* Since we have only two-level page tables, these are trivial
*/
@@ -30,6 +50,8 @@
#define pmd_free(mm, pmd) do { } while (0)
#define pgd_populate(mm,pmd,pte) BUG()

+#endif /* CONFIG_ARM_LPAE */
+
extern pgd_t *get_pgd_slow(struct mm_struct *mm);
extern void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd);

@@ -106,10 +128,12 @@ static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
__free_page(pte);
}

-static inline void __pmd_populate(pmd_t *pmdp, unsigned long pmdval)
+static inline void __pmd_populate(pmd_t *pmdp, pmd_t pmdval)
{
pmdp[0] = __pmd(pmdval);
+#ifndef CONFIG_ARM_LPAE
pmdp[1] = __pmd(pmdval + 256 * sizeof(pte_t));
+#endif
flush_pmd_entry(pmdp);
}

diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h
index 97a5de3..41236f0 100644
--- a/arch/arm/include/asm/pgtable.h
+++ b/arch/arm/include/asm/pgtable.h
@@ -124,7 +124,12 @@ extern pgprot_t pgprot_kernel;
extern struct page *empty_zero_page;
#define ZERO_PAGE(vaddr) (empty_zero_page)

+#ifdef CONFIG_ARM_LPAE
+#define pte_pfn(pte) ((pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT)
+#else
#define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT)
+#endif
+
#define pfn_pte(pfn,prot) (__pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot)))

#define pte_none(pte) (!pte_val(pte))
@@ -143,7 +148,11 @@ extern struct page *empty_zero_page;
#define __pte_unmap(pte) kunmap_atomic((pte - LINUX_PTE_OFFSET))
#endif

+#ifdef CONFIG_ARM_LPAE
+#define set_pte_ext(ptep,pte,ext) cpu_set_pte_ext(ptep,(pte)|(ext))
+#else
#define set_pte_ext(ptep,pte,ext) cpu_set_pte_ext(ptep,pte,ext)
+#endif

#if __LINUX_ARM_ARCH__ < 6
static inline void __sync_icache_dcache(pte_t pteval)
@@ -226,6 +235,30 @@ extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,

#define pmd_none(pmd) (!pmd_val(pmd))
#define pmd_present(pmd) (pmd_val(pmd))
+
+#ifdef CONFIG_ARM_LPAE
+
+#define pmd_bad(pmd) (!(pmd_val(pmd) & 2))
+
+#define copy_pmd(pmdpd,pmdps) \
+ do { \
+ *pmdpd = *pmdps; \
+ flush_pmd_entry(pmdpd); \
+ } while (0)
+
+#define pmd_clear(pmdp) \
+ do { \
+ *pmdp = __pmd(0); \
+ clean_pmd_entry(pmdp); \
+ } while (0)
+
+static inline pte_t *pmd_page_vaddr(pmd_t pmd)
+{
+ return __va(pmd_val(pmd) & PTE_PFN_MASK);
+}
+
+#else /* !CONFIG_ARM_LPAE */
+
#define pmd_bad(pmd) (pmd_val(pmd) & 2)

#define copy_pmd(pmdpd,pmdps) \
@@ -252,7 +285,13 @@ static inline pte_t *pmd_page_vaddr(pmd_t pmd)
return __va(ptr);
}

+#endif /* CONFIG_ARM_LPAE */
+
+#ifdef CONFIG_ARM_LPAE
+#define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PTE_PFN_MASK))
+#else
#define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd)))
+#endif

/*
* Conversion functions: convert a page and protection to a page entry,
@@ -260,6 +299,31 @@ static inline pte_t *pmd_page_vaddr(pmd_t pmd)
*/
#define mk_pte(page,prot) pfn_pte(page_to_pfn(page),prot)

+#ifdef CONFIG_ARM_LPAE
+
+#define pgd_none(pgd) (!pgd_val(pgd))
+#define pgd_bad(pgd) (!(pgd_val(pgd) & 2))
+#define pgd_present(pgd) (pgd_val(pgd))
+
+#define pgd_clear(pgdp) \
+ do { \
+ *pgdp = __pgd(0); \
+ clean_pmd_entry(pgdp); \
+ } while (0)
+
+#define set_pgd(pgdp, pgd) \
+ do { \
+ *pgdp = pgd; \
+ flush_pmd_entry(pgdp); \
+ } while (0)
+
+static inline pte_t *pgd_page_vaddr(pmd_t pgd)
+{
+ return __va(pgd_val(pgd) & PTE_PFN_MASK);
+}
+
+#else /* !CONFIG_ARM_LPAE */
+
/*
* The "pgd_xxx()" functions here are trivial for a folded two-level
* setup: the pgd is never bad, and a pmd always exists (as it's folded
@@ -271,6 +335,8 @@ static inline pte_t *pmd_page_vaddr(pmd_t pmd)
#define pgd_clear(pgdp) do { } while (0)
#define set_pgd(pgd,pgdp) do { } while (0)

+#endif /* CONFIG_ARM_LPAE */
+
/* to find an entry in a page-table-directory */
#define pgd_index(addr) ((addr) >> PGDIR_SHIFT)

@@ -280,7 +346,13 @@ static inline pte_t *pmd_page_vaddr(pmd_t pmd)
#define pgd_offset_k(addr) pgd_offset(&init_mm, addr)

/* Find an entry in the second-level page table.. */
+#ifdef CONFIG_ARM_LPAE
+#define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
+#define pmd_offset(pgdp, addr) ((pmd_t *)(pgd_page_vaddr(*(pgdp))) + \
+ pmd_index(addr))
+#else
#define pmd_offset(dir, addr) ((pmd_t *)(dir))
+#endif

/* Find an entry in the third-level page table.. */
#define __pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
diff --git a/arch/arm/include/asm/proc-fns.h b/arch/arm/include/asm/proc-fns.h
index 8fdae9b..f00ae99 100644
--- a/arch/arm/include/asm/proc-fns.h
+++ b/arch/arm/include/asm/proc-fns.h
@@ -263,6 +263,18 @@

#define cpu_switch_mm(pgd,mm) cpu_do_switch_mm(virt_to_phys(pgd),mm)

+#ifdef CONFIG_ARM_LPAE
+#define cpu_get_pgd() \
+ ({ \
+ unsigned long pg, pg2; \
+ __asm__("mrrc p15, 0, %0, %1, c2" \
+ : "=r" (pg), "=r" (pg2) \
+ : \
+ : "cc"); \
+ pg &= ~(PTRS_PER_PGD*sizeof(pgd_t)-1); \
+ (pgd_t *)phys_to_virt(pg); \
+ })
+#else
#define cpu_get_pgd() \
({ \
unsigned long pg; \
@@ -271,6 +283,7 @@
pg &= ~0x3fff; \
(pgd_t *)phys_to_virt(pg); \
})
+#endif

#endif

diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c
index 17e7b0b..ccfb2ab 100644
--- a/arch/arm/mm/ioremap.c
+++ b/arch/arm/mm/ioremap.c
@@ -64,7 +64,7 @@ void __check_kvm_seq(struct mm_struct *mm)
} while (seq != init_mm.context.kvm_seq);
}

-#ifndef CONFIG_SMP
+#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
/*
* Section support is unsafe on SMP - If you iounmap and ioremap a region,
* the other CPUs will not see this change until their next context switch.
@@ -195,11 +195,13 @@ void __iomem * __arm_ioremap_pfn_caller(unsigned long pfn,
unsigned long addr;
struct vm_struct * area;

+#ifndef CONFIG_ARM_LPAE
/*
* High mappings must be supersection aligned
*/
if (pfn >= 0x100000 && (__pfn_to_phys(pfn) & ~SUPERSECTION_MASK))
return NULL;
+#endif

/*
* Don't allow RAM to be mapped - this causes problems with ARMv6+
@@ -225,7 +227,7 @@ void __iomem * __arm_ioremap_pfn_caller(unsigned long pfn,
return NULL;
addr = (unsigned long)area->addr;

-#ifndef CONFIG_SMP
+#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
if (DOMAIN_IO == 0 &&
(((cpu_architecture() >= CPU_ARCH_ARMv6) && (get_cr() & CR_XP)) ||
cpu_is_xsc3()) && pfn >= 0x100000 &&
@@ -296,7 +298,7 @@ EXPORT_SYMBOL(__arm_ioremap);
void __iounmap(volatile void __iomem *io_addr)
{
void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr);
-#ifndef CONFIG_SMP
+#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
struct vm_struct **p, *tmp;

/*
diff --git a/arch/arm/mm/pgd.c b/arch/arm/mm/pgd.c
index 69bbfc6..e7c149b 100644
--- a/arch/arm/mm/pgd.c
+++ b/arch/arm/mm/pgd.c
@@ -10,6 +10,7 @@
#include <linux/mm.h>
#include <linux/gfp.h>
#include <linux/highmem.h>
+#include <linux/slab.h>

#include <asm/pgalloc.h>
#include <asm/page.h>
@@ -17,7 +18,15 @@

#include "mm.h"

+#ifdef CONFIG_ARM_LPAE
+#define alloc_pgd() kmalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL)
+#define free_pgd(pgd) kfree(pgd)
+#define FIRST_KERNEL_PGD_NR (PAGE_OFFSET >> PGDIR_SHIFT)
+#else
+#define alloc_pgd() (pgd_t *)__get_free_pages(GFP_KERNEL, 2)
+#define free_pgd(pgd) free_pages((unsigned long)pgd, 2)
#define FIRST_KERNEL_PGD_NR (FIRST_USER_PGD_NR + USER_PTRS_PER_PGD)
+#endif

/*
* need to get a 16k page for level 1
@@ -28,7 +37,7 @@ pgd_t *get_pgd_slow(struct mm_struct *mm)
pmd_t *new_pmd, *init_pmd;
pte_t *new_pte, *init_pte;

- new_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL, 2);
+ new_pgd = alloc_pgd();
if (!new_pgd)
goto no_pgd;

@@ -68,7 +77,7 @@ pgd_t *get_pgd_slow(struct mm_struct *mm)
no_pte:
pmd_free(mm, new_pmd);
no_pmd:
- free_pages((unsigned long)new_pgd, 2);
+ free_pgd(new_pgd);
no_pgd:
return NULL;
}
@@ -81,7 +90,8 @@ void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd)
if (!pgd)
return;

- /* pgd is always present and good */
+ if (pgd_none(*pgd))
+ goto free;
pmd = pmd_off(pgd, 0);
if (pmd_none(*pmd))
goto free;
@@ -96,5 +106,5 @@ void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd)
pte_free(mm, pte);
pmd_free(mm, pmd);
free:
- free_pages((unsigned long) pgd, 2);
+ free_pgd(pgd);
}
diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S
index 2b5b20b..1098a49 100644
--- a/arch/arm/mm/proc-v7.S
+++ b/arch/arm/mm/proc-v7.S
@@ -130,6 +130,13 @@ ENDPROC(cpu_v7_switch_mm)
*/
ENTRY(cpu_v7_set_pte_ext)
#ifdef CONFIG_MMU
+#ifdef CONFIG_ARM_LPAE
+ tst r2, #L_PTE_PRESENT
+ beq 1f
+ tst r3, #1 << (55 - 32) @ L_PTE_DIRTY
+ orreq r2, #L_PTE_NOWRITE
+1: strd r2, r3, [r0]
+#else /* !CONFIG_ARM_LPAE */
ARM( str r1, [r0], #-2048 ) @ linux version
THUMB( str r1, [r0] ) @ linux version
THUMB( sub r0, r0, #2048 )
@@ -162,6 +169,7 @@ ENTRY(cpu_v7_set_pte_ext)
moveq r3, #0

str r3, [r0]
+#endif /* CONFIG_ARM_LPAE */
mcr p15, 0, r0, c7, c10, 1 @ flush_pte
#endif
mov pc, lr

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