powerpc/mm: Add SMP support to no-hash TLB handling
This commit moves the whole no-hash TLB handling out of line into a new tlb_nohash.c file, and implements some basic SMP support using IPIs and/or broadcast tlbivax instructions. Note that I'm using local invalidations for D->I cache coherency. At worst, if another processor is trying to execute the same and has the old entry in its TLB, it will just take a fault and re-do the TLB flush locally (it won't re-do the cache flush in any case). Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Benjamin Herrenschmidt
Paul Mackerras
Родитель
7c03d653cd
Коммит
f048aace29
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@ -85,7 +85,7 @@ static inline void *kmap_atomic_prot(struct page *page, enum km_type type, pgpro
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BUG_ON(!pte_none(*(kmap_pte-idx)));
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#endif
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__set_pte_at(&init_mm, vaddr, kmap_pte-idx, mk_pte(page, prot));
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local_flush_tlb_page(vaddr);
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local_flush_tlb_page(NULL, vaddr);
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return (void*) vaddr;
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}
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@ -113,7 +113,7 @@ static inline void kunmap_atomic(void *kvaddr, enum km_type type)
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* this pte without first remap it
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*/
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pte_clear(&init_mm, vaddr, kmap_pte-idx);
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local_flush_tlb_page(vaddr);
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local_flush_tlb_page(NULL, vaddr);
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#endif
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pagefault_enable();
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}
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@ -30,6 +30,22 @@
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*/
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#define MMU_FTR_BIG_PHYS ASM_CONST(0x00020000)
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/* Enable use of broadcast TLB invalidations. We don't always set it
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* on processors that support it due to other constraints with the
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* use of such invalidations
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*/
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#define MMU_FTR_USE_TLBIVAX_BCAST ASM_CONST(0x00040000)
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/* Enable use of tlbilx invalidate-by-PID variant.
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*/
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#define MMU_FTR_USE_TLBILX_PID ASM_CONST(0x00080000)
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/* This indicates that the processor cannot handle multiple outstanding
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* broadcast tlbivax or tlbsync. This makes the code use a spinlock
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* around such invalidate forms.
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*/
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#define MMU_FTR_LOCK_BCAST_INVAL ASM_CONST(0x00100000)
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#ifndef __ASSEMBLY__
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#include <asm/cputable.h>
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@ -6,7 +6,9 @@
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*
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* - flush_tlb_mm(mm) flushes the specified mm context TLB's
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* - flush_tlb_page(vma, vmaddr) flushes one page
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* - local_flush_tlb_page(vmaddr) flushes one page on the local processor
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* - local_flush_tlb_mm(mm) flushes the specified mm context on
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* the local processor
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* - local_flush_tlb_page(vma, vmaddr) flushes one page on the local processor
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* - flush_tlb_page_nohash(vma, vmaddr) flushes one page if SW loaded TLB
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* - flush_tlb_range(vma, start, end) flushes a range of pages
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* - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
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@ -18,7 +20,7 @@
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*/
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#ifdef __KERNEL__
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#if defined(CONFIG_4xx) || defined(CONFIG_8xx) || defined(CONFIG_FSL_BOOKE)
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#ifdef CONFIG_PPC_MMU_NOHASH
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/*
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* TLB flushing for software loaded TLB chips
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*
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@ -31,10 +33,10 @@
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#define MMU_NO_CONTEXT ((unsigned int)-1)
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extern void _tlbie(unsigned long address, unsigned int pid);
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extern void _tlbil_all(void);
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extern void _tlbil_pid(unsigned int pid);
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extern void _tlbil_va(unsigned long address, unsigned int pid);
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extern void _tlbivax_bcast(unsigned long address, unsigned int pid);
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#if defined(CONFIG_40x) || defined(CONFIG_8xx)
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#define _tlbia() asm volatile ("tlbia; sync" : : : "memory")
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@ -42,48 +44,26 @@ extern void _tlbil_va(unsigned long address, unsigned int pid);
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extern void _tlbia(void);
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#endif
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static inline void local_flush_tlb_mm(struct mm_struct *mm)
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{
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_tlbil_pid(mm->context.id);
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}
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extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long end);
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extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
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static inline void flush_tlb_mm(struct mm_struct *mm)
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{
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_tlbil_pid(mm->context.id);
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}
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extern void local_flush_tlb_mm(struct mm_struct *mm);
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extern void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
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static inline void local_flush_tlb_page(unsigned long vmaddr)
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{
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_tlbil_va(vmaddr, 0);
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}
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#ifdef CONFIG_SMP
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extern void flush_tlb_mm(struct mm_struct *mm);
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extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
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#else
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#define flush_tlb_mm(mm) local_flush_tlb_mm(mm)
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#define flush_tlb_page(vma,addr) local_flush_tlb_page(vma,addr)
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#endif
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#define flush_tlb_page_nohash(vma,addr) flush_tlb_page(vma,addr)
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static inline void flush_tlb_page(struct vm_area_struct *vma,
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unsigned long vmaddr)
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{
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_tlbil_va(vmaddr, vma ? vma->vm_mm->context.id : 0);
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}
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#elif defined(CONFIG_PPC_STD_MMU_32)
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static inline void flush_tlb_page_nohash(struct vm_area_struct *vma,
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unsigned long vmaddr)
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{
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flush_tlb_page(vma, vmaddr);
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}
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static inline void flush_tlb_range(struct vm_area_struct *vma,
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unsigned long start, unsigned long end)
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{
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_tlbil_pid(vma->vm_mm->context.id);
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}
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static inline void flush_tlb_kernel_range(unsigned long start,
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unsigned long end)
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{
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_tlbil_pid(0);
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}
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#elif defined(CONFIG_PPC32)
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/*
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* TLB flushing for "classic" hash-MMMU 32-bit CPUs, 6xx, 7xx, 7xxx
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* TLB flushing for "classic" hash-MMU 32-bit CPUs, 6xx, 7xx, 7xxx
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*/
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extern void _tlbie(unsigned long address);
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extern void _tlbia(void);
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@ -94,14 +74,20 @@ extern void flush_tlb_page_nohash(struct vm_area_struct *vma, unsigned long addr
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extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long end);
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extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
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static inline void local_flush_tlb_page(unsigned long vmaddr)
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static inline void local_flush_tlb_page(struct vm_area_struct *vma,
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unsigned long vmaddr)
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{
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flush_tlb_page(NULL, vmaddr);
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flush_tlb_page(vma, vmaddr);
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}
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static inline void local_flush_tlb_mm(struct mm_struct *mm)
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{
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flush_tlb_mm(mm);
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}
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#else
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#elif defined(CONFIG_PPC_STD_MMU_64)
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/*
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* TLB flushing for 64-bit has-MMU CPUs
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* TLB flushing for 64-bit hash-MMU CPUs
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*/
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#include <linux/percpu.h>
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@ -151,11 +137,16 @@ extern void flush_hash_page(unsigned long va, real_pte_t pte, int psize,
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extern void flush_hash_range(unsigned long number, int local);
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static inline void local_flush_tlb_mm(struct mm_struct *mm)
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{
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}
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static inline void flush_tlb_mm(struct mm_struct *mm)
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{
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}
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static inline void local_flush_tlb_page(unsigned long vmaddr)
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static inline void local_flush_tlb_page(struct vm_area_struct *vma,
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unsigned long vmaddr)
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{
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}
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@ -183,7 +174,8 @@ static inline void flush_tlb_kernel_range(unsigned long start,
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extern void __flush_hash_table_range(struct mm_struct *mm, unsigned long start,
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unsigned long end);
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#else
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#error Unsupported MMU type
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#endif
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#endif /*__KERNEL__ */
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@ -29,6 +29,7 @@
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#include <asm/asm-offsets.h>
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#include <asm/processor.h>
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#include <asm/kexec.h>
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#include <asm/bug.h>
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.text
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@ -496,6 +497,14 @@ _GLOBAL(_tlbil_va)
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blr
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#endif /* CONFIG_FSL_BOOKE */
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/*
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* Nobody implements this yet
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*/
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_GLOBAL(_tlbivax_bcast)
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1: trap
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EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0;
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blr
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/*
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* Flush instruction cache.
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@ -116,12 +116,6 @@ EXPORT_SYMBOL(giveup_spe);
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#ifndef CONFIG_PPC64
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EXPORT_SYMBOL(flush_instruction_cache);
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EXPORT_SYMBOL(flush_tlb_kernel_range);
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EXPORT_SYMBOL(flush_tlb_page);
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EXPORT_SYMBOL(_tlbie);
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#if defined(CONFIG_4xx) || defined(CONFIG_8xx) || defined(CONFIG_FSL_BOOKE)
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EXPORT_SYMBOL(_tlbil_va);
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#endif
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#endif
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EXPORT_SYMBOL(__flush_icache_range);
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EXPORT_SYMBOL(flush_dcache_range);
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@ -9,7 +9,7 @@ endif
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obj-y := fault.o mem.o pgtable.o \
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init_$(CONFIG_WORD_SIZE).o \
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pgtable_$(CONFIG_WORD_SIZE).o
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obj-$(CONFIG_PPC_MMU_NOHASH) += mmu_context_nohash.o
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obj-$(CONFIG_PPC_MMU_NOHASH) += mmu_context_nohash.o tlb_nohash.o
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hash-$(CONFIG_PPC_NATIVE) := hash_native_64.o
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obj-$(CONFIG_PPC64) += hash_utils_64.o \
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slb_low.o slb.o stab.o \
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@ -284,7 +284,7 @@ good_area:
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}
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pte_update(ptep, 0, _PAGE_HWEXEC |
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_PAGE_ACCESSED);
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_tlbie(address, mm->context.id);
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local_flush_tlb_page(vma, address);
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pte_unmap_unlock(ptep, ptl);
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up_read(&mm->mmap_sem);
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return 0;
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@ -488,7 +488,7 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
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* we invalidate the TLB here, thus avoiding dcbst
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* misbehaviour.
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*/
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_tlbie(address, 0 /* 8xx doesn't care about PID */);
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_tlbil_va(address, 0 /* 8xx doesn't care about PID */);
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#endif
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/* The _PAGE_USER test should really be _PAGE_EXEC, but
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* older glibc versions execute some code from no-exec
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@ -137,6 +137,7 @@ void flush_tlb_kernel_range(unsigned long start, unsigned long end)
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flush_range(&init_mm, start, end);
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FINISH_FLUSH;
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}
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EXPORT_SYMBOL(flush_tlb_kernel_range);
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/*
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* Flush all the (user) entries for the address space described by mm.
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@ -160,6 +161,7 @@ void flush_tlb_mm(struct mm_struct *mm)
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flush_range(mp->vm_mm, mp->vm_start, mp->vm_end);
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FINISH_FLUSH;
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}
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EXPORT_SYMBOL(flush_tlb_mm);
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void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
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{
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@ -176,6 +178,7 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
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flush_hash_pages(mm->context.id, vmaddr, pmd_val(*pmd), 1);
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FINISH_FLUSH;
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}
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EXPORT_SYMBOL(flush_tlb_page);
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/*
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* For each address in the range, find the pte for the address
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@ -188,3 +191,4 @@ void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
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flush_range(vma->vm_mm, start, end);
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FINISH_FLUSH;
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}
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EXPORT_SYMBOL(flush_tlb_range);
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|
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@ -0,0 +1,209 @@
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/*
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* This file contains the routines for TLB flushing.
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* On machines where the MMU does not use a hash table to store virtual to
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* physical translations (ie, SW loaded TLBs or Book3E compilant processors,
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* this does -not- include 603 however which shares the implementation with
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* hash based processors)
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*
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* -- BenH
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*
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* Copyright 2008 Ben Herrenschmidt <benh@kernel.crashing.org>
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* IBM Corp.
|
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*
|
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* Derived from arch/ppc/mm/init.c:
|
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
|
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*
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* Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
|
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* and Cort Dougan (PReP) (cort@cs.nmt.edu)
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* Copyright (C) 1996 Paul Mackerras
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*
|
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* Derived from "arch/i386/mm/init.c"
|
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* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
|
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*
|
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* This program is free software; you can redistribute it and/or
|
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* modify it under the terms of the GNU General Public License
|
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* as published by the Free Software Foundation; either version
|
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* 2 of the License, or (at your option) any later version.
|
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*
|
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*/
|
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|
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#include <linux/kernel.h>
|
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#include <linux/mm.h>
|
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#include <linux/init.h>
|
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#include <linux/highmem.h>
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#include <linux/pagemap.h>
|
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#include <linux/preempt.h>
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#include <linux/spinlock.h>
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#include <asm/tlbflush.h>
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#include <asm/tlb.h>
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#include "mmu_decl.h"
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/*
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* Base TLB flushing operations:
|
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*
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* - flush_tlb_mm(mm) flushes the specified mm context TLB's
|
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* - flush_tlb_page(vma, vmaddr) flushes one page
|
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* - flush_tlb_range(vma, start, end) flushes a range of pages
|
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* - flush_tlb_kernel_range(start, end) flushes kernel pages
|
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*
|
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* - local_* variants of page and mm only apply to the current
|
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* processor
|
||||
*/
|
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|
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/*
|
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* These are the base non-SMP variants of page and mm flushing
|
||||
*/
|
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void local_flush_tlb_mm(struct mm_struct *mm)
|
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{
|
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unsigned int pid;
|
||||
|
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preempt_disable();
|
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pid = mm->context.id;
|
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if (pid != MMU_NO_CONTEXT)
|
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_tlbil_pid(pid);
|
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preempt_enable();
|
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}
|
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EXPORT_SYMBOL(local_flush_tlb_mm);
|
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|
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void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
|
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{
|
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unsigned int pid;
|
||||
|
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preempt_disable();
|
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pid = vma ? vma->vm_mm->context.id : 0;
|
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if (pid != MMU_NO_CONTEXT)
|
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_tlbil_va(vmaddr, pid);
|
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preempt_enable();
|
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}
|
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EXPORT_SYMBOL(local_flush_tlb_page);
|
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|
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|
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/*
|
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* And here are the SMP non-local implementations
|
||||
*/
|
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#ifdef CONFIG_SMP
|
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|
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static DEFINE_SPINLOCK(tlbivax_lock);
|
||||
|
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struct tlb_flush_param {
|
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unsigned long addr;
|
||||
unsigned int pid;
|
||||
};
|
||||
|
||||
static void do_flush_tlb_mm_ipi(void *param)
|
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{
|
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struct tlb_flush_param *p = param;
|
||||
|
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_tlbil_pid(p ? p->pid : 0);
|
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}
|
||||
|
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static void do_flush_tlb_page_ipi(void *param)
|
||||
{
|
||||
struct tlb_flush_param *p = param;
|
||||
|
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_tlbil_va(p->addr, p->pid);
|
||||
}
|
||||
|
||||
|
||||
/* Note on invalidations and PID:
|
||||
*
|
||||
* We snapshot the PID with preempt disabled. At this point, it can still
|
||||
* change either because:
|
||||
* - our context is being stolen (PID -> NO_CONTEXT) on another CPU
|
||||
* - we are invaliating some target that isn't currently running here
|
||||
* and is concurrently acquiring a new PID on another CPU
|
||||
* - some other CPU is re-acquiring a lost PID for this mm
|
||||
* etc...
|
||||
*
|
||||
* However, this shouldn't be a problem as we only guarantee
|
||||
* invalidation of TLB entries present prior to this call, so we
|
||||
* don't care about the PID changing, and invalidating a stale PID
|
||||
* is generally harmless.
|
||||
*/
|
||||
|
||||
void flush_tlb_mm(struct mm_struct *mm)
|
||||
{
|
||||
cpumask_t cpu_mask;
|
||||
unsigned int pid;
|
||||
|
||||
preempt_disable();
|
||||
pid = mm->context.id;
|
||||
if (unlikely(pid == MMU_NO_CONTEXT))
|
||||
goto no_context;
|
||||
cpu_mask = mm->cpu_vm_mask;
|
||||
cpu_clear(smp_processor_id(), cpu_mask);
|
||||
if (!cpus_empty(cpu_mask)) {
|
||||
struct tlb_flush_param p = { .pid = pid };
|
||||
smp_call_function_mask(cpu_mask, do_flush_tlb_mm_ipi, &p, 1);
|
||||
}
|
||||
_tlbil_pid(pid);
|
||||
no_context:
|
||||
preempt_enable();
|
||||
}
|
||||
EXPORT_SYMBOL(flush_tlb_mm);
|
||||
|
||||
void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
|
||||
{
|
||||
cpumask_t cpu_mask;
|
||||
unsigned int pid;
|
||||
|
||||
preempt_disable();
|
||||
pid = vma ? vma->vm_mm->context.id : 0;
|
||||
if (unlikely(pid == MMU_NO_CONTEXT))
|
||||
goto bail;
|
||||
cpu_mask = vma->vm_mm->cpu_vm_mask;
|
||||
cpu_clear(smp_processor_id(), cpu_mask);
|
||||
if (!cpus_empty(cpu_mask)) {
|
||||
/* If broadcast tlbivax is supported, use it */
|
||||
if (mmu_has_feature(MMU_FTR_USE_TLBIVAX_BCAST)) {
|
||||
int lock = mmu_has_feature(MMU_FTR_LOCK_BCAST_INVAL);
|
||||
if (lock)
|
||||
spin_lock(&tlbivax_lock);
|
||||
_tlbivax_bcast(vmaddr, pid);
|
||||
if (lock)
|
||||
spin_unlock(&tlbivax_lock);
|
||||
goto bail;
|
||||
} else {
|
||||
struct tlb_flush_param p = { .pid = pid, .addr = vmaddr };
|
||||
smp_call_function_mask(cpu_mask,
|
||||
do_flush_tlb_page_ipi, &p, 1);
|
||||
}
|
||||
}
|
||||
_tlbil_va(vmaddr, pid);
|
||||
bail:
|
||||
preempt_enable();
|
||||
}
|
||||
EXPORT_SYMBOL(flush_tlb_page);
|
||||
|
||||
#endif /* CONFIG_SMP */
|
||||
|
||||
/*
|
||||
* Flush kernel TLB entries in the given range
|
||||
*/
|
||||
void flush_tlb_kernel_range(unsigned long start, unsigned long end)
|
||||
{
|
||||
#ifdef CONFIG_SMP
|
||||
preempt_disable();
|
||||
smp_call_function(do_flush_tlb_mm_ipi, NULL, 1);
|
||||
_tlbil_pid(0);
|
||||
preempt_enable();
|
||||
#endif
|
||||
_tlbil_pid(0);
|
||||
}
|
||||
EXPORT_SYMBOL(flush_tlb_kernel_range);
|
||||
|
||||
/*
|
||||
* Currently, for range flushing, we just do a full mm flush. This should
|
||||
* be optimized based on a threshold on the size of the range, since
|
||||
* some implementation can stack multiple tlbivax before a tlbsync but
|
||||
* for now, we keep it that way
|
||||
*/
|
||||
void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
|
||||
unsigned long end)
|
||||
|
||||
{
|
||||
flush_tlb_mm(vma->vm_mm);
|
||||
}
|
||||
EXPORT_SYMBOL(flush_tlb_range);
|
||||
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