074c2eae3e
We now have pmd entries covering 16MB range and the PMD table double its original size. We use the second half of the PMD table to deposit the pgtable (PTE page). The depoisted PTE page is further used to track the HPTE information. The information include [ secondary group | 3 bit hidx | valid ]. We use one byte per each HPTE entry. With 16MB hugepage and 64K HPTE we need 256 entries and with 4K HPTE we need 4096 entries. Both will fit in a 4K PTE page. On hugepage invalidate we need to walk the PTE page and invalidate all valid HPTEs. This patch implements necessary arch specific functions for THP support and also hugepage invalidate logic. These PMD related functions are intentionally kept similar to their PTE counter-part. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
176 lines
4.9 KiB
C
176 lines
4.9 KiB
C
#ifndef _ASM_POWERPC_TLBFLUSH_H
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#define _ASM_POWERPC_TLBFLUSH_H
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/*
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* TLB flushing:
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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_mm(mm, full) 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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*
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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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#ifdef __KERNEL__
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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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* TODO: (CONFIG_FSL_BOOKE) determine if flush_tlb_range &
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* flush_tlb_kernel_range are best implemented as tlbia vs
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* specific tlbie's
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*/
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struct vm_area_struct;
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struct mm_struct;
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#define MMU_NO_CONTEXT ((unsigned int)-1)
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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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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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extern void __local_flush_tlb_page(struct mm_struct *mm, unsigned long vmaddr,
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int tsize, int ind);
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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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extern void __flush_tlb_page(struct mm_struct *mm, unsigned long vmaddr,
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int tsize, int ind);
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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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#define __flush_tlb_page(mm,addr,p,i) __local_flush_tlb_page(mm,addr,p,i)
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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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#elif defined(CONFIG_PPC_STD_MMU_32)
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/*
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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 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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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(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 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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#elif defined(CONFIG_PPC_STD_MMU_64)
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#define MMU_NO_CONTEXT 0
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/*
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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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#include <asm/page.h>
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#define PPC64_TLB_BATCH_NR 192
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struct ppc64_tlb_batch {
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int active;
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unsigned long index;
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struct mm_struct *mm;
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real_pte_t pte[PPC64_TLB_BATCH_NR];
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unsigned long vpn[PPC64_TLB_BATCH_NR];
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unsigned int psize;
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int ssize;
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};
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DECLARE_PER_CPU(struct ppc64_tlb_batch, ppc64_tlb_batch);
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extern void __flush_tlb_pending(struct ppc64_tlb_batch *batch);
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#define __HAVE_ARCH_ENTER_LAZY_MMU_MODE
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static inline void arch_enter_lazy_mmu_mode(void)
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{
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struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
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batch->active = 1;
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}
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static inline void arch_leave_lazy_mmu_mode(void)
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{
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struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
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if (batch->index)
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__flush_tlb_pending(batch);
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batch->active = 0;
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}
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#define arch_flush_lazy_mmu_mode() do {} while (0)
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extern void flush_hash_page(unsigned long vpn, real_pte_t pte, int psize,
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int ssize, int local);
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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(struct vm_area_struct *vma,
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unsigned long vmaddr)
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{
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}
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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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}
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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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}
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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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}
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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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}
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/* Private function for use by PCI IO mapping code */
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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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extern void flush_tlb_pmd_range(struct mm_struct *mm, pmd_t *pmd,
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unsigned long addr);
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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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#endif /* _ASM_POWERPC_TLBFLUSH_H */
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