diff options
Diffstat (limited to 'arch/powerpc/mm/nohash/8xx.c')
| -rw-r--r-- | arch/powerpc/mm/nohash/8xx.c | 65 |
1 files changed, 56 insertions, 9 deletions
diff --git a/arch/powerpc/mm/nohash/8xx.c b/arch/powerpc/mm/nohash/8xx.c index 4a06cb342da2..3189308dece4 100644 --- a/arch/powerpc/mm/nohash/8xx.c +++ b/arch/powerpc/mm/nohash/8xx.c @@ -21,33 +21,34 @@ extern int __map_without_ltlbs; static unsigned long block_mapped_ram; /* - * Return PA for this VA if it is in an area mapped with LTLBs. + * Return PA for this VA if it is in an area mapped with LTLBs or fixmap. * Otherwise, returns 0 */ phys_addr_t v_block_mapped(unsigned long va) { unsigned long p = PHYS_IMMR_BASE; - if (__map_without_ltlbs) - return 0; if (va >= VIRT_IMMR_BASE && va < VIRT_IMMR_BASE + IMMR_SIZE) return p + va - VIRT_IMMR_BASE; + if (__map_without_ltlbs) + return 0; if (va >= PAGE_OFFSET && va < PAGE_OFFSET + block_mapped_ram) return __pa(va); return 0; } /* - * Return VA for a given PA mapped with LTLBs or 0 if not mapped + * Return VA for a given PA mapped with LTLBs or fixmap + * Return 0 if not mapped */ unsigned long p_block_mapped(phys_addr_t pa) { unsigned long p = PHYS_IMMR_BASE; - if (__map_without_ltlbs) - return 0; if (pa >= p && pa < p + IMMR_SIZE) return VIRT_IMMR_BASE + pa - p; + if (__map_without_ltlbs) + return 0; if (pa < block_mapped_ram) return (unsigned long)__va(pa); return 0; @@ -103,6 +104,19 @@ static void mmu_patch_addis(s32 *site, long simm) patch_instruction_site(site, instr); } +static void mmu_mapin_ram_chunk(unsigned long offset, unsigned long top, pgprot_t prot) +{ + unsigned long s = offset; + unsigned long v = PAGE_OFFSET + s; + phys_addr_t p = memstart_addr + s; + + for (; s < top; s += PAGE_SIZE) { + map_kernel_page(v, p, prot); + v += PAGE_SIZE; + p += PAGE_SIZE; + } +} + unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top) { unsigned long mapped; @@ -115,10 +129,20 @@ unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top) if (!IS_ENABLED(CONFIG_PIN_TLB_TEXT)) mmu_patch_cmp_limit(&patch__itlbmiss_linmem_top, 0); } else { + unsigned long einittext8 = ALIGN(__pa(_einittext), SZ_8M); + mapped = top & ~(LARGE_PAGE_SIZE_8M - 1); if (!IS_ENABLED(CONFIG_PIN_TLB_TEXT)) - mmu_patch_cmp_limit(&patch__itlbmiss_linmem_top, - _ALIGN(__pa(_einittext), 8 << 20)); + mmu_patch_cmp_limit(&patch__itlbmiss_linmem_top, einittext8); + + /* + * Populate page tables to: + * - have them appear in /sys/kernel/debug/kernel_page_tables + * - allow the BDI to find the pages when they are not PINNED + */ + mmu_mapin_ram_chunk(0, einittext8, PAGE_KERNEL_X); + mmu_mapin_ram_chunk(einittext8, mapped, PAGE_KERNEL); + mmu_mapin_immr(); } mmu_patch_cmp_limit(&patch__dtlbmiss_linmem_top, mapped); @@ -144,18 +168,41 @@ void mmu_mark_initmem_nx(void) if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX) && CONFIG_ETEXT_SHIFT < 23) mmu_patch_addis(&patch__itlbmiss_linmem_top8, -((long)_etext & ~(LARGE_PAGE_SIZE_8M - 1))); - if (!IS_ENABLED(CONFIG_PIN_TLB_TEXT)) + if (!IS_ENABLED(CONFIG_PIN_TLB_TEXT)) { + unsigned long einittext8 = ALIGN(__pa(_einittext), SZ_8M); + unsigned long etext8 = ALIGN(__pa(_etext), SZ_8M); + unsigned long etext = __pa(_etext); + mmu_patch_cmp_limit(&patch__itlbmiss_linmem_top, __pa(_etext)); + + /* Update page tables for PTDUMP and BDI */ + mmu_mapin_ram_chunk(0, einittext8, __pgprot(0)); + if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)) { + mmu_mapin_ram_chunk(0, etext, PAGE_KERNEL_TEXT); + mmu_mapin_ram_chunk(etext, einittext8, PAGE_KERNEL); + } else { + mmu_mapin_ram_chunk(0, etext8, PAGE_KERNEL_TEXT); + mmu_mapin_ram_chunk(etext8, einittext8, PAGE_KERNEL); + } + } } #ifdef CONFIG_STRICT_KERNEL_RWX void mmu_mark_rodata_ro(void) { + unsigned long sinittext = __pa(_sinittext); + unsigned long etext = __pa(_etext); + if (CONFIG_DATA_SHIFT < 23) mmu_patch_addis(&patch__dtlbmiss_romem_top8, -__pa(((unsigned long)_sinittext) & ~(LARGE_PAGE_SIZE_8M - 1))); mmu_patch_addis(&patch__dtlbmiss_romem_top, -__pa(_sinittext)); + + /* Update page tables for PTDUMP and BDI */ + mmu_mapin_ram_chunk(0, sinittext, __pgprot(0)); + mmu_mapin_ram_chunk(0, etext, PAGE_KERNEL_ROX); + mmu_mapin_ram_chunk(etext, sinittext, PAGE_KERNEL_RO); } #endif |
