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sparc64: Move to 64-bit PGDs and PMDs. 

To make the page tables compact, we were using 32-bit PGDs and PMDs.
We only had to support <= 43 bits of physical addresses so this was
quite feasible.

In order to support larger physical addresses we have to move to
64-bit PGDs and PMDs.

Most of the changes are straight-forward:

1) {pgd,pmd}_t --> unsigned long

2) Anything that tries to use plain "unsigned int" types with pgd/pmd
   values needs to be adjusted.  In particular things like "0U" become
   "0UL".

3) {PGDIR,PMD}_BITS decrease by one.

4) In the assembler page table walkers, use "ldxa" instead of "lduwa"
   and adjust the low bit masks to clear out the low 3 bits instead of
   just the low 2 bits during pgd/pmd address formation.

Also, use PTRS_PER_PGD and PTRS_PER_PMD in the sizing of the
swapper_{pg_dir,low_pmd_dir} arrays.

This patch does not try to take advantage of having 64-bits in the
PMDs to simplify the hugepage code, that will come in a subsequent
change.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2013-09-25 14:33:16 -07:00
parent 37b3a8ff3e
commit 2b77933c28
4 changed files with 34 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
arch/sparc/include/asm/page_64.h
View File

@ -56,8 +56,8 @@ extern void copy_user_page(void *to, void *from, unsigned long vaddr, struct pag
/* These are used to make use of C type-checking.. */
typedef struct { unsigned long pte; } pte_t;
typedef struct { unsigned long iopte; } iopte_t;
typedef struct { unsigned int pmd; } pmd_t;
typedef struct { unsigned int pgd; } pgd_t;
typedef struct { unsigned long pmd; } pmd_t;
typedef struct { unsigned long pgd; } pgd_t;
typedef struct { unsigned long pgprot; } pgprot_t;
#define pte_val(x) ((x).pte)
@ -76,8 +76,8 @@ typedef struct { unsigned long pgprot; } pgprot_t;
/* .. while these make it easier on the compiler */
typedef unsigned long pte_t;
typedef unsigned long iopte_t;
typedef unsigned int pmd_t;
typedef unsigned int pgd_t;
typedef unsigned long pmd_t;
typedef unsigned long pgd_t;
typedef unsigned long pgprot_t;
#define pte_val(x) (x)
@ -97,15 +97,18 @@ typedef unsigned long pgprot_t;
typedef pte_t *pgtable_t;
/* These two values define the virtual address space range in which we
* must forbid 64-bit user processes from making mappings. It
* represents the virtual address space hole present in most early
* sparc64 chips including UltraSPARC-I. The next two defines specify
* the actual exclusion region we enforce, wherein we use a 4GB red
* zone on each side of the VA hole.
* must forbid 64-bit user processes from making mappings. It used to
* represent precisely the virtual address space hole present in most
* early sparc64 chips including UltraSPARC-I. But now it also is
* further constrained by the limits of our page tables, which is
* 43-bits of virtual address.
*/
#define SPARC64_VA_HOLE_TOP _AC(0xfffff80000000000,UL)
#define SPARC64_VA_HOLE_BOTTOM _AC(0x0000080000000000,UL)
#define SPARC64_VA_HOLE_TOP _AC(0xfffffc0000000000,UL)
#define SPARC64_VA_HOLE_BOTTOM _AC(0x0000040000000000,UL)
/* The next two defines specify the actual exclusion region we
* enforce, wherein we use a 4GB red zone on each side of the VA hole.
*/
#define VA_EXCLUDE_START (SPARC64_VA_HOLE_BOTTOM - (1UL << 32UL))
#define VA_EXCLUDE_END (SPARC64_VA_HOLE_TOP + (1UL << 32UL))

22
arch/sparc/include/asm/pgtable_64.h
View File

@ -51,15 +51,15 @@
#define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT-3))
#define PMD_SIZE (_AC(1,UL) << PMD_SHIFT)
#define PMD_MASK (~(PMD_SIZE-1))
#define PMD_BITS (PAGE_SHIFT - 2)
#define PMD_BITS (PAGE_SHIFT - 3)
/* PGDIR_SHIFT determines what a third-level page table entry can map */
#define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT-3) + PMD_BITS)
#define PGDIR_SIZE (_AC(1,UL) << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE-1))
#define PGDIR_BITS (PAGE_SHIFT - 2)
#define PGDIR_BITS (PAGE_SHIFT - 3)
#if (PGDIR_SHIFT + PGDIR_BITS) != 45
#if (PGDIR_SHIFT + PGDIR_BITS) != 43
#error Page table parameters do not cover virtual address space properly.
#endif
@ -714,7 +714,7 @@ extern pgprot_t pmd_pgprot(pmd_t entry);
static inline int pmd_present(pmd_t pmd)
{
return pmd_val(pmd) != 0U;
return pmd_val(pmd) != 0UL;
}
#define pmd_none(pmd) (!pmd_val(pmd))
@ -741,7 +741,7 @@ static inline void pmd_set(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
(pud_val(*(pudp)) = (__pa((unsigned long) (pmdp)) >> PGD_PADDR_SHIFT))
static inline unsigned long __pmd_page(pmd_t pmd)
{
unsigned long paddr = (unsigned long) pmd_val(pmd);
unsigned long paddr = pmd_val(pmd);
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
if (pmd_val(pmd) & PMD_ISHUGE)
paddr &= PMD_HUGE_PADDR;
@ -751,14 +751,14 @@ static inline unsigned long __pmd_page(pmd_t pmd)
}
#define pmd_page(pmd) virt_to_page((void *)__pmd_page(pmd))
#define pud_page_vaddr(pud) \
((unsigned long) __va((((unsigned long)pud_val(pud))<<PGD_PADDR_SHIFT)))
((unsigned long) __va((pud_val(pud)<<PGD_PADDR_SHIFT)))
#define pud_page(pud) virt_to_page((void *)pud_page_vaddr(pud))
#define pmd_bad(pmd) (0)
#define pmd_clear(pmdp) (pmd_val(*(pmdp)) = 0U)
#define pmd_clear(pmdp) (pmd_val(*(pmdp)) = 0UL)
#define pud_none(pud) (!pud_val(pud))
#define pud_bad(pud) (0)
#define pud_present(pud) (pud_val(pud) != 0U)
#define pud_clear(pudp) (pud_val(*(pudp)) = 0U)
#define pud_clear(pudp) (pud_val(*(pudp)) = 0UL)
/* Same in both SUN4V and SUN4U. */
#define pte_none(pte) (!pte_val(pte))
@ -793,7 +793,7 @@ static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm,
pmd_t *pmdp)
{
pmd_t pmd = *pmdp;
set_pmd_at(mm, addr, pmdp, __pmd(0U));
set_pmd_at(mm, addr, pmdp, __pmd(0UL));
return pmd;
}
@ -841,8 +841,8 @@ static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr,
})
#endif
extern pgd_t swapper_pg_dir[2048];
extern pmd_t swapper_low_pmd_dir[2048];
extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
extern pmd_t swapper_low_pmd_dir[PTRS_PER_PMD];
extern void paging_init(void);
extern unsigned long find_ecache_flush_span(unsigned long size);

16
arch/sparc/include/asm/tsb.h
View File

@ -142,14 +142,14 @@ extern struct tsb_phys_patch_entry __tsb_phys_patch, __tsb_phys_patch_end;
or REG1, %lo(swapper_pg_dir), REG1; \
sllx VADDR, 64 - (PGDIR_SHIFT + PGDIR_BITS), REG2; \
srlx REG2, 64 - PAGE_SHIFT, REG2; \
andn REG2, 0x3, REG2; \
lduw [REG1 + REG2], REG1; \
andn REG2, 0x7, REG2; \
ldx [REG1 + REG2], REG1; \
brz,pn REG1, FAIL_LABEL; \
sllx VADDR, 64 - (PMD_SHIFT + PMD_BITS), REG2; \
srlx REG2, 64 - PAGE_SHIFT, REG2; \
sllx REG1, PGD_PADDR_SHIFT, REG1; \
andn REG2, 0x3, REG2; \
lduwa [REG1 + REG2] ASI_PHYS_USE_EC, REG1; \
andn REG2, 0x7, REG2; \
ldxa [REG1 + REG2] ASI_PHYS_USE_EC, REG1; \
brz,pn REG1, FAIL_LABEL; \
sllx VADDR, 64 - PMD_SHIFT, REG2; \
srlx REG2, 64 - PAGE_SHIFT, REG2; \
@ -260,14 +260,14 @@ extern struct tsb_phys_patch_entry __tsb_phys_patch, __tsb_phys_patch_end;
#define USER_PGTABLE_WALK_TL1(VADDR, PHYS_PGD, REG1, REG2, FAIL_LABEL) \
sllx VADDR, 64 - (PGDIR_SHIFT + PGDIR_BITS), REG2; \
srlx REG2, 64 - PAGE_SHIFT, REG2; \
andn REG2, 0x3, REG2; \
lduwa [PHYS_PGD + REG2] ASI_PHYS_USE_EC, REG1; \
andn REG2, 0x7, REG2; \
ldxa [PHYS_PGD + REG2] ASI_PHYS_USE_EC, REG1; \
brz,pn REG1, FAIL_LABEL; \
sllx VADDR, 64 - (PMD_SHIFT + PMD_BITS), REG2; \
srlx REG2, 64 - PAGE_SHIFT, REG2; \
sllx REG1, PGD_PADDR_SHIFT, REG1; \
andn REG2, 0x3, REG2; \
lduwa [REG1 + REG2] ASI_PHYS_USE_EC, REG1; \
andn REG2, 0x7, REG2; \
ldxa [REG1 + REG2] ASI_PHYS_USE_EC, REG1; \
USER_PGTABLE_CHECK_PMD_HUGE(VADDR, REG1, REG2, FAIL_LABEL, 800f) \
sllx VADDR, 64 - PMD_SHIFT, REG2; \
srlx REG2, 64 - PAGE_SHIFT, REG2; \

2
arch/sparc/mm/init_64.c
View File

@ -1842,7 +1842,7 @@ static void __init sun4v_linear_pte_xor_finalize(void)
/* paging_init() sets up the page tables */
static unsigned long last_valid_pfn;
pgd_t swapper_pg_dir[2048];
pgd_t swapper_pg_dir[PTRS_PER_PGD];
static void sun4u_pgprot_init(void);
static void sun4v_pgprot_init(void);