From 8f361453d8e9a67c85b2cf9b93c642c2d8fe0462 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Thu, 13 Dec 2007 06:13:38 -0800 Subject: [PATCH] [SPARC64]: Fix two kernel linear mapping setup bugs. This was caught and identified by Greg Onufer. Since we setup the 256M/4M bitmap table after taking over the trap table, it's possible for some 4M mapping to get loaded in the TLB beforhand which later will be 256M mappings. This can cause illegal TLB multiple-match conditions. Fix this by setting up the bitmap before we take over the trap table. Next, __flush_tlb_all() was not doing anything on hypervisor platforms. Fix by adding sun4v_mmu_demap_all() and calling it. Signed-off-by: David S. Miller --- arch/sparc64/kernel/entry.S | 12 ++++++++++++ arch/sparc64/mm/init.c | 29 ++++++++++++++++++++--------- include/asm-sparc64/hypervisor.h | 4 ++++ 3 files changed, 36 insertions(+), 9 deletions(-) diff --git a/arch/sparc64/kernel/entry.S b/arch/sparc64/kernel/entry.S index c9b0d7af64..ea257e8283 100644 --- a/arch/sparc64/kernel/entry.S +++ b/arch/sparc64/kernel/entry.S @@ -2593,3 +2593,15 @@ sun4v_mmustat_info: retl nop .size sun4v_mmustat_info, .-sun4v_mmustat_info + + .globl sun4v_mmu_demap_all + .type sun4v_mmu_demap_all,#function +sun4v_mmu_demap_all: + clr %o0 + clr %o1 + mov HV_MMU_ALL, %o2 + mov HV_FAST_MMU_DEMAP_ALL, %o5 + ta HV_FAST_TRAP + retl + nop + .size sun4v_mmu_demap_all, .-sun4v_mmu_demap_all diff --git a/arch/sparc64/mm/init.c b/arch/sparc64/mm/init.c index e18ccf8522..fbeb55d71e 100644 --- a/arch/sparc64/mm/init.c +++ b/arch/sparc64/mm/init.c @@ -1133,14 +1133,9 @@ static void __init mark_kpte_bitmap(unsigned long start, unsigned long end) } } -static void __init kernel_physical_mapping_init(void) +static void __init init_kpte_bitmap(void) { unsigned long i; -#ifdef CONFIG_DEBUG_PAGEALLOC - unsigned long mem_alloced = 0UL; -#endif - - read_obp_memory("reg", &pall[0], &pall_ents); for (i = 0; i < pall_ents; i++) { unsigned long phys_start, phys_end; @@ -1149,14 +1144,24 @@ static void __init kernel_physical_mapping_init(void) phys_end = phys_start + pall[i].reg_size; mark_kpte_bitmap(phys_start, phys_end); + } +} +static void __init kernel_physical_mapping_init(void) +{ #ifdef CONFIG_DEBUG_PAGEALLOC + unsigned long i, mem_alloced = 0UL; + + for (i = 0; i < pall_ents; i++) { + unsigned long phys_start, phys_end; + + phys_start = pall[i].phys_addr; + phys_end = phys_start + pall[i].reg_size; + mem_alloced += kernel_map_range(phys_start, phys_end, PAGE_KERNEL); -#endif } -#ifdef CONFIG_DEBUG_PAGEALLOC printk("Allocated %ld bytes for kernel page tables.\n", mem_alloced); @@ -1398,6 +1403,10 @@ void __init paging_init(void) inherit_prom_mappings(); + read_obp_memory("reg", &pall[0], &pall_ents); + + init_kpte_bitmap(); + /* Ok, we can use our TLB miss and window trap handlers safely. */ setup_tba(); @@ -1904,7 +1913,9 @@ void __flush_tlb_all(void) "wrpr %0, %1, %%pstate" : "=r" (pstate) : "i" (PSTATE_IE)); - if (tlb_type == spitfire) { + if (tlb_type == hypervisor) { + sun4v_mmu_demap_all(); + } else if (tlb_type == spitfire) { for (i = 0; i < 64; i++) { /* Spitfire Errata #32 workaround */ /* NOTE: Always runs on spitfire, so no diff --git a/include/asm-sparc64/hypervisor.h b/include/asm-sparc64/hypervisor.h index 524d49835d..3ad45dff52 100644 --- a/include/asm-sparc64/hypervisor.h +++ b/include/asm-sparc64/hypervisor.h @@ -709,6 +709,10 @@ extern unsigned long sun4v_mmu_tsb_ctx0(unsigned long num_descriptions, */ #define HV_FAST_MMU_DEMAP_ALL 0x24 +#ifndef __ASSEMBLY__ +extern void sun4v_mmu_demap_all(void); +#endif + /* mmu_map_perm_addr() * TRAP: HV_FAST_TRAP * FUNCTION: HV_FAST_MMU_MAP_PERM_ADDR -- 2.39.5