diff options
Diffstat (limited to 'include/asm-powerpc')
| -rw-r--r-- | include/asm-powerpc/mmu-hash64.h | 3 | ||||
| -rw-r--r-- | include/asm-powerpc/pgalloc-64.h | 5 | ||||
| -rw-r--r-- | include/asm-powerpc/pgtable-64k.h | 39 | ||||
| -rw-r--r-- | include/asm-powerpc/systbl.h | 1 | ||||
| -rw-r--r-- | include/asm-powerpc/unistd.h | 3 |
5 files changed, 48 insertions, 3 deletions
diff --git a/include/asm-powerpc/mmu-hash64.h b/include/asm-powerpc/mmu-hash64.h index 2a1b4040e20..2864fa3989e 100644 --- a/include/asm-powerpc/mmu-hash64.h +++ b/include/asm-powerpc/mmu-hash64.h @@ -265,7 +265,7 @@ static inline unsigned long hpt_hash(unsigned long va, unsigned int shift, extern int __hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid, pte_t *ptep, unsigned long trap, - unsigned int local, int ssize); + unsigned int local, int ssize, int subpage_prot); extern int __hash_page_64K(unsigned long ea, unsigned long access, unsigned long vsid, pte_t *ptep, unsigned long trap, unsigned int local, int ssize); @@ -279,6 +279,7 @@ extern int htab_bolt_mapping(unsigned long vstart, unsigned long vend, unsigned long pstart, unsigned long mode, int psize, int ssize); extern void set_huge_psize(int psize); +extern void demote_segment_4k(struct mm_struct *mm, unsigned long addr); extern void htab_initialize(void); extern void htab_initialize_secondary(void); diff --git a/include/asm-powerpc/pgalloc-64.h b/include/asm-powerpc/pgalloc-64.h index 94d0294341d..43214c8085b 100644 --- a/include/asm-powerpc/pgalloc-64.h +++ b/include/asm-powerpc/pgalloc-64.h @@ -12,6 +12,10 @@ #include <linux/cpumask.h> #include <linux/percpu.h> +#ifndef CONFIG_PPC_SUBPAGE_PROT +static inline void subpage_prot_free(pgd_t *pgd) {} +#endif + extern struct kmem_cache *pgtable_cache[]; #define PGD_CACHE_NUM 0 @@ -27,6 +31,7 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm) static inline void pgd_free(pgd_t *pgd) { + subpage_prot_free(pgd); kmem_cache_free(pgtable_cache[PGD_CACHE_NUM], pgd); } diff --git a/include/asm-powerpc/pgtable-64k.h b/include/asm-powerpc/pgtable-64k.h index bd54b772fbc..1cbd6b377ee 100644 --- a/include/asm-powerpc/pgtable-64k.h +++ b/include/asm-powerpc/pgtable-64k.h @@ -13,12 +13,49 @@ #define PTE_TABLE_SIZE (sizeof(real_pte_t) << PTE_INDEX_SIZE) #define PMD_TABLE_SIZE (sizeof(pmd_t) << PMD_INDEX_SIZE) #define PGD_TABLE_SIZE (sizeof(pgd_t) << PGD_INDEX_SIZE) -#endif /* __ASSEMBLY__ */ #define PTRS_PER_PTE (1 << PTE_INDEX_SIZE) #define PTRS_PER_PMD (1 << PMD_INDEX_SIZE) #define PTRS_PER_PGD (1 << PGD_INDEX_SIZE) +#ifdef CONFIG_PPC_SUBPAGE_PROT +/* + * For the sub-page protection option, we extend the PGD with one of + * these. Basically we have a 3-level tree, with the top level being + * the protptrs array. To optimize speed and memory consumption when + * only addresses < 4GB are being protected, pointers to the first + * four pages of sub-page protection words are stored in the low_prot + * array. + * Each page of sub-page protection words protects 1GB (4 bytes + * protects 64k). For the 3-level tree, each page of pointers then + * protects 8TB. + */ +struct subpage_prot_table { + unsigned long maxaddr; /* only addresses < this are protected */ + unsigned int **protptrs[2]; + unsigned int *low_prot[4]; +}; + +#undef PGD_TABLE_SIZE +#define PGD_TABLE_SIZE ((sizeof(pgd_t) << PGD_INDEX_SIZE) + \ + sizeof(struct subpage_prot_table)) + +#define SBP_L1_BITS (PAGE_SHIFT - 2) +#define SBP_L2_BITS (PAGE_SHIFT - 3) +#define SBP_L1_COUNT (1 << SBP_L1_BITS) +#define SBP_L2_COUNT (1 << SBP_L2_BITS) +#define SBP_L2_SHIFT (PAGE_SHIFT + SBP_L1_BITS) +#define SBP_L3_SHIFT (SBP_L2_SHIFT + SBP_L2_BITS) + +extern void subpage_prot_free(pgd_t *pgd); + +static inline struct subpage_prot_table *pgd_subpage_prot(pgd_t *pgd) +{ + return (struct subpage_prot_table *)(pgd + PTRS_PER_PGD); +} +#endif /* CONFIG_PPC_SUBPAGE_PROT */ +#endif /* __ASSEMBLY__ */ + /* With 4k base page size, hugepage PTEs go at the PMD level */ #define MIN_HUGEPTE_SHIFT PAGE_SHIFT diff --git a/include/asm-powerpc/systbl.h b/include/asm-powerpc/systbl.h index 11d5383b2f0..0c8b0d67913 100644 --- a/include/asm-powerpc/systbl.h +++ b/include/asm-powerpc/systbl.h @@ -313,3 +313,4 @@ COMPAT_SYS_SPU(timerfd) SYSCALL_SPU(eventfd) COMPAT_SYS_SPU(sync_file_range2) COMPAT_SYS(fallocate) +SYSCALL(subpage_prot) diff --git a/include/asm-powerpc/unistd.h b/include/asm-powerpc/unistd.h index 97d82b6a940..fedc4b8e49e 100644 --- a/include/asm-powerpc/unistd.h +++ b/include/asm-powerpc/unistd.h @@ -332,10 +332,11 @@ #define __NR_eventfd 307 #define __NR_sync_file_range2 308 #define __NR_fallocate 309 +#define __NR_subpage_prot 310 #ifdef __KERNEL__ -#define __NR_syscalls 310 +#define __NR_syscalls 311 #define __NR__exit __NR_exit #define NR_syscalls __NR_syscalls |