diff options
| -rw-r--r-- | arch/mips/Kconfig | 13 | ||||
| -rw-r--r-- | arch/mips/include/asm/pgalloc.h | 26 | ||||
| -rw-r--r-- | arch/mips/include/asm/pgtable-64.h | 88 | ||||
| -rw-r--r-- | arch/mips/mm/init.c | 3 | ||||
| -rw-r--r-- | arch/mips/mm/pgtable-64.c | 33 | ||||
| -rw-r--r-- | arch/mips/mm/tlbex.c | 22 |
6 files changed, 172 insertions, 13 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 68af16b..f4dd2c3 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -2121,10 +2121,13 @@ config MIPS_VA_BITS_48 bool "48 bits virtual memory" depends on 64BIT help - Support a maximum at least 48 bits of application virtual memory. - Default is 40 bits or less, depending on the CPU. - This option result in a small memory overhead for page tables. - This option is only supported with 16k and 64k page sizes. + Support a maximum at least 48 bits of application virtual + memory. Default is 40 bits or less, depending on the CPU. + For page sizes 16k and above, this option results in a small + memory overhead for page tables. For 4k page size, a fourth + level of page tables is added which imposes both a memory + overhead as well as slower TLB fault handling. + If unsure, say N. choice @@ -2134,7 +2137,6 @@ choice config PAGE_SIZE_4KB bool "4kB" depends on !CPU_LOONGSON2 && !CPU_LOONGSON3 - depends on !MIPS_VA_BITS_48 help This option select the standard 4kB Linux page size. On some R3000-family processors this is the only available page size. Using @@ -2983,6 +2985,7 @@ config HAVE_LATENCYTOP_SUPPORT config PGTABLE_LEVELS int + default 4 if PAGE_SIZE_4KB && MIPS_VA_BITS_48 default 3 if 64BIT && !PAGE_SIZE_64KB default 2 diff --git a/arch/mips/include/asm/pgalloc.h b/arch/mips/include/asm/pgalloc.h index a8705f6..a1bdb1e 100644 --- a/arch/mips/include/asm/pgalloc.h +++ b/arch/mips/include/asm/pgalloc.h @@ -110,6 +110,32 @@ static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) #endif +#ifndef __PAGETABLE_PUD_FOLDED + +static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address) +{ + pud_t *pud; + + pud = (pud_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT, PUD_ORDER); + if (pud) + pud_init((unsigned long)pud, (unsigned long)invalid_pmd_table); + return pud; +} + +static inline void pud_free(struct mm_struct *mm, pud_t *pud) +{ + free_pages((unsigned long)pud, PUD_ORDER); +} + +static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud) +{ + set_pgd(pgd, __pgd((unsigned long)pud)); +} + +#define __pud_free_tlb(tlb, x, addr) pud_free((tlb)->mm, x) + +#endif /* __PAGETABLE_PUD_FOLDED */ + #define check_pgt_cache() do { } while (0) extern void pagetable_init(void); diff --git a/arch/mips/include/asm/pgtable-64.h b/arch/mips/include/asm/pgtable-64.h index 130a2a6..67fe6dc 100644 --- a/arch/mips/include/asm/pgtable-64.h +++ b/arch/mips/include/asm/pgtable-64.h @@ -20,7 +20,7 @@ #define __ARCH_USE_5LEVEL_HACK #if defined(CONFIG_PAGE_SIZE_64KB) && !defined(CONFIG_MIPS_VA_BITS_48) #include <asm-generic/pgtable-nopmd.h> -#else +#elif !(defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_MIPS_VA_BITS_48)) #include <asm-generic/pgtable-nopud.h> #endif @@ -54,9 +54,18 @@ #define PMD_SIZE (1UL << PMD_SHIFT) #define PMD_MASK (~(PMD_SIZE-1)) +# ifdef __PAGETABLE_PUD_FOLDED +# define PGDIR_SHIFT (PMD_SHIFT + (PAGE_SHIFT + PMD_ORDER - 3)) +# endif +#endif -#define PGDIR_SHIFT (PMD_SHIFT + (PAGE_SHIFT + PMD_ORDER - 3)) +#ifndef __PAGETABLE_PUD_FOLDED +#define PUD_SHIFT (PMD_SHIFT + (PAGE_SHIFT + PMD_ORDER - 3)) +#define PUD_SIZE (1UL << PUD_SHIFT) +#define PUD_MASK (~(PUD_SIZE-1)) +#define PGDIR_SHIFT (PUD_SHIFT + (PAGE_SHIFT + PUD_ORDER - 3)) #endif + #define PGDIR_SIZE (1UL << PGDIR_SHIFT) #define PGDIR_MASK (~(PGDIR_SIZE-1)) @@ -79,8 +88,13 @@ * of virtual address space. */ #ifdef CONFIG_PAGE_SIZE_4KB -#define PGD_ORDER 1 -#define PUD_ORDER aieeee_attempt_to_allocate_pud +# ifdef CONFIG_MIPS_VA_BITS_48 +# define PGD_ORDER 0 +# define PUD_ORDER 0 +# else +# define PGD_ORDER 1 +# define PUD_ORDER aieeee_attempt_to_allocate_pud +# endif #define PMD_ORDER 0 #define PTE_ORDER 0 #endif @@ -118,6 +132,9 @@ #endif #define PTRS_PER_PGD ((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t)) +#ifndef __PAGETABLE_PUD_FOLDED +#define PTRS_PER_PUD ((PAGE_SIZE << PUD_ORDER) / sizeof(pud_t)) +#endif #ifndef __PAGETABLE_PMD_FOLDED #define PTRS_PER_PMD ((PAGE_SIZE << PMD_ORDER) / sizeof(pmd_t)) #endif @@ -134,7 +151,7 @@ #define VMALLOC_START (MAP_BASE + (2 * PAGE_SIZE)) #define VMALLOC_END \ (MAP_BASE + \ - min(PTRS_PER_PGD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, \ + min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, \ (1UL << cpu_vmbits)) - (1UL << 32)) #if defined(CONFIG_MODULES) && defined(KBUILD_64BIT_SYM32) && \ @@ -150,12 +167,72 @@ #define pmd_ERROR(e) \ printk("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e)) #endif +#ifndef __PAGETABLE_PUD_FOLDED +#define pud_ERROR(e) \ + printk("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e)) +#endif #define pgd_ERROR(e) \ printk("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e)) extern pte_t invalid_pte_table[PTRS_PER_PTE]; extern pte_t empty_bad_page_table[PTRS_PER_PTE]; +#ifndef __PAGETABLE_PUD_FOLDED +/* + * For 4-level pagetables we defines these ourselves, for 3-level the + * definitions are below, for 2-level the + * definitions are supplied by <asm-generic/pgtable-nopmd.h>. + */ +typedef struct { unsigned long pud; } pud_t; +#define pud_val(x) ((x).pud) +#define __pud(x) ((pud_t) { (x) }) + +extern pud_t invalid_pud_table[PTRS_PER_PUD]; + +/* + * Empty pgd entries point to the invalid_pud_table. + */ +static inline int pgd_none(pgd_t pgd) +{ + return pgd_val(pgd) == (unsigned long)invalid_pud_table; +} + +static inline int pgd_bad(pgd_t pgd) +{ + if (unlikely(pgd_val(pgd) & ~PAGE_MASK)) + return 1; + + return 0; +} + +static inline int pgd_present(pgd_t pgd) +{ + return pgd_val(pgd) != (unsigned long)invalid_pud_table; +} + +static inline void pgd_clear(pgd_t *pgdp) +{ + pgd_val(*pgdp) = (unsigned long)invalid_pud_table; +} + +#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)) + +static inline unsigned long pgd_page_vaddr(pgd_t pgd) +{ + return pgd_val(pgd); +} + +static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address) +{ + return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address); +} + +static inline void set_pgd(pgd_t *pgd, pgd_t pgdval) +{ + *pgd = pgdval; +} + +#endif #ifndef __PAGETABLE_PMD_FOLDED /* @@ -281,6 +358,7 @@ static inline pmd_t *pmd_offset(pud_t * pud, unsigned long address) * Initialize a new pgd / pmd table with invalid pointers. */ extern void pgd_init(unsigned long page); +extern void pud_init(unsigned long page, unsigned long pagetable); extern void pmd_init(unsigned long page, unsigned long pagetable); /* diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c index aa75849..37aa931 100644 --- a/arch/mips/mm/init.c +++ b/arch/mips/mm/init.c @@ -537,6 +537,9 @@ unsigned long pgd_current[NR_CPUS]; * it in the linker script. */ pgd_t swapper_pg_dir[_PTRS_PER_PGD] __section(.bss..swapper_pg_dir); +#ifndef __PAGETABLE_PUD_FOLDED +pud_t invalid_pud_table[PTRS_PER_PUD] __page_aligned_bss; +#endif #ifndef __PAGETABLE_PMD_FOLDED pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss; EXPORT_SYMBOL_GPL(invalid_pmd_table); diff --git a/arch/mips/mm/pgtable-64.c b/arch/mips/mm/pgtable-64.c index 0ae7b28..6fd6e96 100644 --- a/arch/mips/mm/pgtable-64.c +++ b/arch/mips/mm/pgtable-64.c @@ -19,10 +19,12 @@ void pgd_init(unsigned long page) unsigned long *p, *end; unsigned long entry; -#ifdef __PAGETABLE_PMD_FOLDED - entry = (unsigned long)invalid_pte_table; -#else +#if !defined(__PAGETABLE_PUD_FOLDED) + entry = (unsigned long)invalid_pud_table; +#elif !defined(__PAGETABLE_PMD_FOLDED) entry = (unsigned long)invalid_pmd_table; +#else + entry = (unsigned long)invalid_pte_table; #endif p = (unsigned long *) page; @@ -64,6 +66,28 @@ void pmd_init(unsigned long addr, unsigned long pagetable) EXPORT_SYMBOL_GPL(pmd_init); #endif +#ifndef __PAGETABLE_PUD_FOLDED +void pud_init(unsigned long addr, unsigned long pagetable) +{ + unsigned long *p, *end; + + p = (unsigned long *)addr; + end = p + PTRS_PER_PUD; + + do { + p[0] = pagetable; + p[1] = pagetable; + p[2] = pagetable; + p[3] = pagetable; + p[4] = pagetable; + p += 8; + p[-3] = pagetable; + p[-2] = pagetable; + p[-1] = pagetable; + } while (p != end); +} +#endif + pmd_t mk_pmd(struct page *page, pgprot_t prot) { pmd_t pmd; @@ -87,6 +111,9 @@ void __init pagetable_init(void) /* Initialize the entire pgd. */ pgd_init((unsigned long)swapper_pg_dir); +#ifndef __PAGETABLE_PUD_FOLDED + pud_init((unsigned long)invalid_pud_table, (unsigned long)invalid_pmd_table); +#endif #ifndef __PAGETABLE_PMD_FOLDED pmd_init((unsigned long)invalid_pmd_table, (unsigned long)invalid_pte_table); #endif diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c index 4f642e0..ed1c529 100644 --- a/arch/mips/mm/tlbex.c +++ b/arch/mips/mm/tlbex.c @@ -865,6 +865,13 @@ void build_get_pmde64(u32 **p, struct uasm_label **l, struct uasm_reloc **r, uasm_i_andi(p, tmp, tmp, (PTRS_PER_PGD - 1)<<3); uasm_i_daddu(p, ptr, ptr, tmp); /* add in pgd offset */ +#ifndef __PAGETABLE_PUD_FOLDED + uasm_i_dmfc0(p, tmp, C0_BADVADDR); /* get faulting address */ + uasm_i_ld(p, ptr, 0, ptr); /* get pud pointer */ + uasm_i_dsrl_safe(p, tmp, tmp, PUD_SHIFT - 3); /* get pud offset in bytes */ + uasm_i_andi(p, tmp, tmp, (PTRS_PER_PUD - 1) << 3); + uasm_i_daddu(p, ptr, ptr, tmp); /* add in pud offset */ +#endif #ifndef __PAGETABLE_PMD_FOLDED uasm_i_dmfc0(p, tmp, C0_BADVADDR); /* get faulting address */ uasm_i_ld(p, ptr, 0, ptr); /* get pmd pointer */ @@ -1184,6 +1191,21 @@ build_fast_tlb_refill_handler (u32 **p, struct uasm_label **l, uasm_i_ld(p, LOC_PTEP, 0, ptr); /* get pmd pointer */ } +#ifndef __PAGETABLE_PUD_FOLDED + /* get pud offset in bytes */ + uasm_i_dsrl_safe(p, scratch, tmp, PUD_SHIFT - 3); + uasm_i_andi(p, scratch, scratch, (PTRS_PER_PUD - 1) << 3); + + if (use_lwx_insns()) { + UASM_i_LWX(p, ptr, scratch, ptr); + } else { + uasm_i_daddu(p, ptr, ptr, scratch); /* add in pmd offset */ + UASM_i_LW(p, ptr, 0, ptr); + } + /* ptr contains a pointer to PMD entry */ + /* tmp contains the address */ +#endif + #ifndef __PAGETABLE_PMD_FOLDED /* get pmd offset in bytes */ uasm_i_dsrl_safe(p, scratch, tmp, PMD_SHIFT - 3); 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