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Diffstat (limited to 'include/asm-generic/tlb.h')
| -rw-r--r-- | include/asm-generic/tlb.h | 854 |
1 files changed, 854 insertions, 0 deletions
diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h new file mode 100644 index 000000000..bdcc2778a --- /dev/null +++ b/include/asm-generic/tlb.h @@ -0,0 +1,854 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* include/asm-generic/tlb.h + * + * Generic TLB shootdown code + * + * Copyright 2001 Red Hat, Inc. + * Based on code from mm/memory.c Copyright Linus Torvalds and others. + * + * Copyright 2011 Red Hat, Inc., Peter Zijlstra + */ +#ifndef _ASM_GENERIC__TLB_H +#define _ASM_GENERIC__TLB_H + +#include <linux/mmu_notifier.h> +#include <linux/swap.h> +#include <linux/hugetlb_inline.h> +#include <asm/tlbflush.h> +#include <asm/cacheflush.h> + +/* + * Blindly accessing user memory from NMI context can be dangerous + * if we're in the middle of switching the current user task or switching + * the loaded mm. + */ +#ifndef nmi_uaccess_okay +# define nmi_uaccess_okay() true +#endif + +#ifdef CONFIG_MMU + +/* + * Generic MMU-gather implementation. + * + * The mmu_gather data structure is used by the mm code to implement the + * correct and efficient ordering of freeing pages and TLB invalidations. + * + * This correct ordering is: + * + * 1) unhook page + * 2) TLB invalidate page + * 3) free page + * + * That is, we must never free a page before we have ensured there are no live + * translations left to it. Otherwise it might be possible to observe (or + * worse, change) the page content after it has been reused. + * + * The mmu_gather API consists of: + * + * - tlb_gather_mmu() / tlb_gather_mmu_fullmm() / tlb_gather_mmu_vma() / + * tlb_finish_mmu() + * + * start and finish a mmu_gather + * + * Finish in particular will issue a (final) TLB invalidate and free + * all (remaining) queued pages. + * + * - tlb_start_vma() / tlb_end_vma(); marks the start / end of a VMA + * + * Defaults to flushing at tlb_end_vma() to reset the range; helps when + * there's large holes between the VMAs. + * + * - tlb_free_vmas() + * + * tlb_free_vmas() marks the start of unlinking of one or more vmas + * and freeing page-tables. + * + * - tlb_remove_table() + * + * tlb_remove_table() is the basic primitive to free page-table directories + * (__p*_free_tlb()). In it's most primitive form it is an alias for + * tlb_remove_page() below, for when page directories are pages and have no + * additional constraints. + * + * See also MMU_GATHER_TABLE_FREE and MMU_GATHER_RCU_TABLE_FREE. + * + * - tlb_remove_page() / tlb_remove_page_size() + * - __tlb_remove_folio_pages() / __tlb_remove_page_size() + * - __tlb_remove_folio_pages_size() + * + * __tlb_remove_folio_pages_size() is the basic primitive that queues pages + * for freeing. It will return a boolean indicating if the queue is (now) + * full and a call to tlb_flush_mmu() is required. + * + * tlb_remove_page() and tlb_remove_page_size() imply the call to + * tlb_flush_mmu() when required and has no return value. + * + * __tlb_remove_folio_pages() is similar to __tlb_remove_page_size(), + * however, instead of removing a single page, assume PAGE_SIZE and remove + * the given number of consecutive pages that are all part of the + * same (large) folio. + * + * - tlb_change_page_size() + * + * call before __tlb_remove_page*() to set the current page-size; implies a + * possible tlb_flush_mmu() call. + * + * - tlb_flush_mmu() / tlb_flush_mmu_tlbonly() + * + * tlb_flush_mmu_tlbonly() - does the TLB invalidate (and resets + * related state, like the range) + * + * tlb_flush_mmu() - in addition to the above TLB invalidate, also frees + * whatever pages are still batched. + * + * - mmu_gather::fullmm + * + * A flag set by tlb_gather_mmu_fullmm() to indicate we're going to free + * the entire mm; this allows a number of optimizations. + * + * - We can ignore tlb_{start,end}_vma(); because we don't + * care about ranges. Everything will be shot down. + * + * - (RISC) architectures that use ASIDs can cycle to a new ASID + * and delay the invalidation until ASID space runs out. + * + * - mmu_gather::need_flush_all + * + * A flag that can be set by the arch code if it wants to force + * flush the entire TLB irrespective of the range. For instance + * x86-PAE needs this when changing top-level entries. + * + * And allows the architecture to provide and implement tlb_flush(): + * + * tlb_flush() may, in addition to the above mentioned mmu_gather fields, make + * use of: + * + * - mmu_gather::start / mmu_gather::end + * + * which provides the range that needs to be flushed to cover the pages to + * be freed. + * + * - mmu_gather::freed_tables + * + * set when we freed page table pages + * + * - tlb_get_unmap_shift() / tlb_get_unmap_size() + * + * returns the smallest TLB entry size unmapped in this range. + * + * If an architecture does not provide tlb_flush() a default implementation + * based on flush_tlb_range() will be used, unless MMU_GATHER_NO_RANGE is + * specified, in which case we'll default to flush_tlb_mm(). + * + * Additionally there are a few opt-in features: + * + * MMU_GATHER_PAGE_SIZE + * + * This ensures we call tlb_flush() every time tlb_change_page_size() actually + * changes the size and provides mmu_gather::page_size to tlb_flush(). + * + * This might be useful if your architecture has size specific TLB + * invalidation instructions. + * + * MMU_GATHER_TABLE_FREE + * + * This provides tlb_remove_table(), to be used instead of tlb_remove_page() + * for page directores (__p*_free_tlb()). + * + * Useful if your architecture has non-page page directories. + * + * When used, an architecture is expected to provide __tlb_remove_table() or + * use the generic __tlb_remove_table(), which does the actual freeing of these + * pages. + * + * MMU_GATHER_RCU_TABLE_FREE + * + * Like MMU_GATHER_TABLE_FREE, and adds semi-RCU semantics to the free (see + * comment below). + * + * Useful if your architecture doesn't use IPIs for remote TLB invalidates + * and therefore doesn't naturally serialize with software page-table walkers. + * + * MMU_GATHER_NO_FLUSH_CACHE + * + * Indicates the architecture has flush_cache_range() but it needs *NOT* be called + * before unmapping a VMA. + * + * NOTE: strictly speaking we shouldn't have this knob and instead rely on + * flush_cache_range() being a NOP, except Sparc64 seems to be + * different here. + * + * MMU_GATHER_MERGE_VMAS + * + * Indicates the architecture wants to merge ranges over VMAs; typical when + * multiple range invalidates are more expensive than a full invalidate. + * + * MMU_GATHER_NO_RANGE + * + * Use this if your architecture lacks an efficient flush_tlb_range(). This + * option implies MMU_GATHER_MERGE_VMAS above. + * + * MMU_GATHER_NO_GATHER + * + * If the option is set the mmu_gather will not track individual pages for + * delayed page free anymore. A platform that enables the option needs to + * provide its own implementation of the __tlb_remove_page_size() function to + * free pages. + * + * This is useful if your architecture already flushes TLB entries in the + * various ptep_get_and_clear() functions. + */ + +#ifdef CONFIG_MMU_GATHER_TABLE_FREE + +struct mmu_table_batch { +#ifdef CONFIG_MMU_GATHER_RCU_TABLE_FREE + struct rcu_head rcu; +#endif + unsigned int nr; + void *tables[]; +}; + +#define MAX_TABLE_BATCH \ + ((PAGE_SIZE - sizeof(struct mmu_table_batch)) / sizeof(void *)) + +#ifndef CONFIG_HAVE_ARCH_TLB_REMOVE_TABLE +static inline void __tlb_remove_table(void *table) +{ + struct ptdesc *ptdesc = (struct ptdesc *)table; + + pagetable_dtor_free(ptdesc); +} +#endif + +extern void tlb_remove_table(struct mmu_gather *tlb, void *table); + +#else /* !CONFIG_MMU_GATHER_TABLE_FREE */ + +static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page); +/* + * Without MMU_GATHER_TABLE_FREE the architecture is assumed to have page based + * page directories and we can use the normal page batching to free them. + */ +static inline void tlb_remove_table(struct mmu_gather *tlb, void *table) +{ + struct ptdesc *ptdesc = (struct ptdesc *)table; + + pagetable_dtor(ptdesc); + tlb_remove_page(tlb, ptdesc_page(ptdesc)); +} +#endif /* CONFIG_MMU_GATHER_TABLE_FREE */ + +#ifdef CONFIG_MMU_GATHER_RCU_TABLE_FREE +/* + * This allows an architecture that does not use the linux page-tables for + * hardware to skip the TLBI when freeing page tables. + */ +#ifndef tlb_needs_table_invalidate +#define tlb_needs_table_invalidate() (true) +#endif + +void tlb_remove_table_sync_one(void); + +void tlb_remove_table_sync_rcu(void); + +#else + +#ifdef tlb_needs_table_invalidate +#error tlb_needs_table_invalidate() requires MMU_GATHER_RCU_TABLE_FREE +#endif + +static inline void tlb_remove_table_sync_one(void) { } + +static inline void tlb_remove_table_sync_rcu(void) { } + +#endif /* CONFIG_MMU_GATHER_RCU_TABLE_FREE */ + + +#ifndef CONFIG_MMU_GATHER_NO_GATHER +/* + * If we can't allocate a page to make a big batch of page pointers + * to work on, then just handle a few from the on-stack structure. + */ +#define MMU_GATHER_BUNDLE 8 + +struct mmu_gather_batch { + struct mmu_gather_batch *next; + unsigned int nr; + unsigned int max; + struct encoded_page *encoded_pages[]; +}; + +#define MAX_GATHER_BATCH \ + ((PAGE_SIZE - sizeof(struct mmu_gather_batch)) / sizeof(void *)) + +/* + * Limit the maximum number of mmu_gather batches to reduce a risk of soft + * lockups for non-preemptible kernels on huge machines when a lot of memory + * is zapped during unmapping. + * 10K pages freed at once should be safe even without a preemption point. + */ +#define MAX_GATHER_BATCH_COUNT (10000UL/MAX_GATHER_BATCH) + +extern bool __tlb_remove_page_size(struct mmu_gather *tlb, struct page *page, int page_size); +bool __tlb_remove_folio_pages(struct mmu_gather *tlb, struct page *page, + unsigned int nr_pages, bool delay_rmap); + +#ifdef CONFIG_SMP +/* + * This both sets 'delayed_rmap', and returns true. It would be an inline + * function, except we define it before the 'struct mmu_gather'. + */ +#define tlb_delay_rmap(tlb) (((tlb)->delayed_rmap = 1), true) +extern void tlb_flush_rmaps(struct mmu_gather *tlb, struct vm_area_struct *vma); +#endif + +#endif + +/* + * We have a no-op version of the rmap removal that doesn't + * delay anything. That is used on S390, which flushes remote + * TLBs synchronously, and on UP, which doesn't have any + * remote TLBs to flush and is not preemptible due to this + * all happening under the page table lock. + */ +#ifndef tlb_delay_rmap +#define tlb_delay_rmap(tlb) (false) +static inline void tlb_flush_rmaps(struct mmu_gather *tlb, struct vm_area_struct *vma) { } +#endif + +/* + * struct mmu_gather is an opaque type used by the mm code for passing around + * any data needed by arch specific code for tlb_remove_page. + */ +struct mmu_gather { + struct mm_struct *mm; + +#ifdef CONFIG_MMU_GATHER_TABLE_FREE + struct mmu_table_batch *batch; +#endif + + unsigned long start; + unsigned long end; + /* + * we are in the middle of an operation to clear + * a full mm and can make some optimizations + */ + unsigned int fullmm : 1; + + /* + * we have performed an operation which + * requires a complete flush of the tlb + */ + unsigned int need_flush_all : 1; + + /* + * we have removed page directories + */ + unsigned int freed_tables : 1; + + /* + * Do we have pending delayed rmap removals? + */ + unsigned int delayed_rmap : 1; + + /* + * at which levels have we cleared entries? + */ + unsigned int cleared_ptes : 1; + unsigned int cleared_pmds : 1; + unsigned int cleared_puds : 1; + unsigned int cleared_p4ds : 1; + + /* + * tracks VM_EXEC | VM_HUGETLB in tlb_start_vma + */ + unsigned int vma_exec : 1; + unsigned int vma_huge : 1; + unsigned int vma_pfn : 1; + + /* + * Did we unshare (unmap) any shared page tables? For now only + * used for hugetlb PMD table sharing. + */ + unsigned int unshared_tables : 1; + + /* + * Did we unshare any page tables such that they are now exclusive + * and could get reused+modified by the new owner? When setting this + * flag, "unshared_tables" will be set as well. For now only used + * for hugetlb PMD table sharing. + */ + unsigned int fully_unshared_tables : 1; + + unsigned int batch_count; + +#ifndef CONFIG_MMU_GATHER_NO_GATHER + struct mmu_gather_batch *active; + struct mmu_gather_batch local; + struct page *__pages[MMU_GATHER_BUNDLE]; + +#ifdef CONFIG_MMU_GATHER_PAGE_SIZE + unsigned int page_size; +#endif +#endif +}; + +void tlb_flush_mmu(struct mmu_gather *tlb); + +static inline void __tlb_adjust_range(struct mmu_gather *tlb, + unsigned long address, + unsigned int range_size) +{ + tlb->start = min(tlb->start, address); + tlb->end = max(tlb->end, address + range_size); +} + +static inline void __tlb_reset_range(struct mmu_gather *tlb) +{ + if (tlb->fullmm) { + tlb->start = tlb->end = ~0; + } else { + tlb->start = TASK_SIZE; + tlb->end = 0; + } + tlb->freed_tables = 0; + tlb->cleared_ptes = 0; + tlb->cleared_pmds = 0; + tlb->cleared_puds = 0; + tlb->cleared_p4ds = 0; + tlb->unshared_tables = 0; + /* + * Do not reset mmu_gather::vma_* fields here, we do not + * call into tlb_start_vma() again to set them if there is an + * intermediate flush. + */ +} + +#ifdef CONFIG_MMU_GATHER_NO_RANGE + +#if defined(tlb_flush) +#error MMU_GATHER_NO_RANGE relies on default tlb_flush() +#endif + +/* + * When an architecture does not have efficient means of range flushing TLBs + * there is no point in doing intermediate flushes on tlb_end_vma() to keep the + * range small. We equally don't have to worry about page granularity or other + * things. + * + * All we need to do is issue a full flush for any !0 range. + */ +static inline void tlb_flush(struct mmu_gather *tlb) +{ + if (tlb->end) + flush_tlb_mm(tlb->mm); +} + +#else /* CONFIG_MMU_GATHER_NO_RANGE */ + +#ifndef tlb_flush +/* + * When an architecture does not provide its own tlb_flush() implementation + * but does have a reasonably efficient flush_vma_range() implementation + * use that. + */ +static inline void tlb_flush(struct mmu_gather *tlb) +{ + if (tlb->fullmm || tlb->need_flush_all) { + flush_tlb_mm(tlb->mm); + } else if (tlb->end) { + struct vm_area_struct vma = { + .vm_mm = tlb->mm, + .vm_flags = (tlb->vma_exec ? VM_EXEC : 0) | + (tlb->vma_huge ? VM_HUGETLB : 0), + }; + + flush_tlb_range(&vma, tlb->start, tlb->end); + } +} +#endif + +#endif /* CONFIG_MMU_GATHER_NO_RANGE */ + +static inline void +tlb_update_vma_flags(struct mmu_gather *tlb, struct vm_area_struct *vma) +{ + /* + * flush_tlb_range() implementations that look at VM_HUGETLB (tile, + * mips-4k) flush only large pages. + * + * flush_tlb_range() implementations that flush I-TLB also flush D-TLB + * (tile, xtensa, arm), so it's ok to just add VM_EXEC to an existing + * range. + * + * We rely on tlb_end_vma() to issue a flush, such that when we reset + * these values the batch is empty. + */ + tlb->vma_huge = is_vm_hugetlb_page(vma); + tlb->vma_exec = !!(vma->vm_flags & VM_EXEC); + + /* + * Track if there's at least one VM_PFNMAP/VM_MIXEDMAP vma + * in the tracked range, see tlb_free_vmas(). + */ + tlb->vma_pfn |= !!(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP)); +} + +static inline void tlb_flush_mmu_tlbonly(struct mmu_gather *tlb) +{ + /* + * Anything calling __tlb_adjust_range() also sets at least one of + * these bits. + */ + if (!(tlb->freed_tables || tlb->cleared_ptes || tlb->cleared_pmds || + tlb->cleared_puds || tlb->cleared_p4ds || tlb->unshared_tables)) + return; + + tlb_flush(tlb); + __tlb_reset_range(tlb); +} + +static inline void tlb_remove_page_size(struct mmu_gather *tlb, + struct page *page, int page_size) +{ + if (__tlb_remove_page_size(tlb, page, page_size)) + tlb_flush_mmu(tlb); +} + +static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page) +{ + return tlb_remove_page_size(tlb, page, PAGE_SIZE); +} + +static inline void tlb_remove_ptdesc(struct mmu_gather *tlb, struct ptdesc *pt) +{ + tlb_remove_table(tlb, pt); +} + +static inline void tlb_change_page_size(struct mmu_gather *tlb, + unsigned int page_size) +{ +#ifdef CONFIG_MMU_GATHER_PAGE_SIZE + if (tlb->page_size && tlb->page_size != page_size) { + if (!tlb->fullmm && !tlb->need_flush_all) + tlb_flush_mmu(tlb); + } + + tlb->page_size = page_size; +#endif +} + +static inline unsigned long tlb_get_unmap_shift(struct mmu_gather *tlb) +{ + if (tlb->cleared_ptes) + return PAGE_SHIFT; + if (tlb->cleared_pmds) + return PMD_SHIFT; + if (tlb->cleared_puds) + return PUD_SHIFT; + if (tlb->cleared_p4ds) + return P4D_SHIFT; + + return PAGE_SHIFT; +} + +static inline unsigned long tlb_get_unmap_size(struct mmu_gather *tlb) +{ + return 1UL << tlb_get_unmap_shift(tlb); +} + +/* + * In the case of tlb vma handling, we can optimise these away in the + * case where we're doing a full MM flush. When we're doing a munmap, + * the vmas are adjusted to only cover the region to be torn down. + */ +static inline void tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma) +{ + if (tlb->fullmm) + return; + + tlb_update_vma_flags(tlb, vma); +#ifndef CONFIG_MMU_GATHER_NO_FLUSH_CACHE + flush_cache_range(vma, vma->vm_start, vma->vm_end); +#endif +} + +static inline void tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma) +{ + if (tlb->fullmm || IS_ENABLED(CONFIG_MMU_GATHER_MERGE_VMAS)) + return; + + /* + * Do a TLB flush and reset the range at VMA boundaries; this avoids + * the ranges growing with the unused space between consecutive VMAs, + * but also the mmu_gather::vma_* flags from tlb_start_vma() rely on + * this. + */ + tlb_flush_mmu_tlbonly(tlb); +} + +static inline void tlb_free_vmas(struct mmu_gather *tlb) +{ + if (tlb->fullmm) + return; + + /* + * VM_PFNMAP is more fragile because the core mm will not track the + * page mapcount -- there might not be page-frames for these PFNs + * after all. + * + * Specifically() there is a race between munmap() and + * unmap_mapping_range(), where munmap() will unlink the VMA, such + * that unmap_mapping_range() will no longer observe the VMA and + * no-op, without observing the TLBI, returning prematurely. + * + * So if we're about to unlink such a VMA, and we have pending + * TLBI for such a vma, flush things now. + */ + if (tlb->vma_pfn) + tlb_flush_mmu_tlbonly(tlb); +} + +/* + * tlb_flush_{pte|pmd|pud|p4d}_range() adjust the tlb->start and tlb->end, + * and set corresponding cleared_*. + */ +static inline void tlb_flush_pte_range(struct mmu_gather *tlb, + unsigned long address, unsigned long size) +{ + __tlb_adjust_range(tlb, address, size); + tlb->cleared_ptes = 1; +} + +static inline void tlb_flush_pmd_range(struct mmu_gather *tlb, + unsigned long address, unsigned long size) +{ + __tlb_adjust_range(tlb, address, size); + tlb->cleared_pmds = 1; +} + +static inline void tlb_flush_pud_range(struct mmu_gather *tlb, + unsigned long address, unsigned long size) +{ + __tlb_adjust_range(tlb, address, size); + tlb->cleared_puds = 1; +} + +static inline void tlb_flush_p4d_range(struct mmu_gather *tlb, + unsigned long address, unsigned long size) +{ + __tlb_adjust_range(tlb, address, size); + tlb->cleared_p4ds = 1; +} + +#ifndef __tlb_remove_tlb_entry +static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long address) +{ +} +#endif + +/** + * tlb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation. + * + * Record the fact that pte's were really unmapped by updating the range, + * so we can later optimise away the tlb invalidate. This helps when + * userspace is unmapping already-unmapped pages, which happens quite a lot. + */ +#define tlb_remove_tlb_entry(tlb, ptep, address) \ + do { \ + tlb_flush_pte_range(tlb, address, PAGE_SIZE); \ + __tlb_remove_tlb_entry(tlb, ptep, address); \ + } while (0) + +/** + * tlb_remove_tlb_entries - remember unmapping of multiple consecutive ptes for + * later tlb invalidation. + * + * Similar to tlb_remove_tlb_entry(), but remember unmapping of multiple + * consecutive ptes instead of only a single one. + */ +static inline void tlb_remove_tlb_entries(struct mmu_gather *tlb, + pte_t *ptep, unsigned int nr, unsigned long address) +{ + tlb_flush_pte_range(tlb, address, PAGE_SIZE * nr); + for (;;) { + __tlb_remove_tlb_entry(tlb, ptep, address); + if (--nr == 0) + break; + ptep++; + address += PAGE_SIZE; + } +} + +#define tlb_remove_huge_tlb_entry(h, tlb, ptep, address) \ + do { \ + unsigned long _sz = huge_page_size(h); \ + if (_sz >= P4D_SIZE) \ + tlb_flush_p4d_range(tlb, address, _sz); \ + else if (_sz >= PUD_SIZE) \ + tlb_flush_pud_range(tlb, address, _sz); \ + else if (_sz >= PMD_SIZE) \ + tlb_flush_pmd_range(tlb, address, _sz); \ + else \ + tlb_flush_pte_range(tlb, address, _sz); \ + __tlb_remove_tlb_entry(tlb, ptep, address); \ + } while (0) + +/** + * tlb_remove_pmd_tlb_entry - remember a pmd mapping for later tlb invalidation + * This is a nop so far, because only x86 needs it. + */ +#ifndef __tlb_remove_pmd_tlb_entry +#define __tlb_remove_pmd_tlb_entry(tlb, pmdp, address) do {} while (0) +#endif + +#define tlb_remove_pmd_tlb_entry(tlb, pmdp, address) \ + do { \ + tlb_flush_pmd_range(tlb, address, HPAGE_PMD_SIZE); \ + __tlb_remove_pmd_tlb_entry(tlb, pmdp, address); \ + } while (0) + +/** + * tlb_remove_pud_tlb_entry - remember a pud mapping for later tlb + * invalidation. This is a nop so far, because only x86 needs it. + */ +#ifndef __tlb_remove_pud_tlb_entry +#define __tlb_remove_pud_tlb_entry(tlb, pudp, address) do {} while (0) +#endif + +#define tlb_remove_pud_tlb_entry(tlb, pudp, address) \ + do { \ + tlb_flush_pud_range(tlb, address, HPAGE_PUD_SIZE); \ + __tlb_remove_pud_tlb_entry(tlb, pudp, address); \ + } while (0) + +/* + * For things like page tables caches (ie caching addresses "inside" the + * page tables, like x86 does), for legacy reasons, flushing an + * individual page had better flush the page table caches behind it. This + * is definitely how x86 works, for example. And if you have an + * architected non-legacy page table cache (which I'm not aware of + * anybody actually doing), you're going to have some architecturally + * explicit flushing for that, likely *separate* from a regular TLB entry + * flush, and thus you'd need more than just some range expansion.. + * + * So if we ever find an architecture + * that would want something that odd, I think it is up to that + * architecture to do its own odd thing, not cause pain for others + * http://lkml.kernel.org/r/CA+55aFzBggoXtNXQeng5d_mRoDnaMBE5Y+URs+PHR67nUpMtaw@mail.gmail.com + * + * For now w.r.t page table cache, mark the range_size as PAGE_SIZE + */ + +#ifndef pte_free_tlb +#define pte_free_tlb(tlb, ptep, address) \ + do { \ + tlb_flush_pmd_range(tlb, address, PAGE_SIZE); \ + tlb->freed_tables = 1; \ + __pte_free_tlb(tlb, ptep, address); \ + } while (0) +#endif + +#ifndef pmd_free_tlb +#define pmd_free_tlb(tlb, pmdp, address) \ + do { \ + tlb_flush_pud_range(tlb, address, PAGE_SIZE); \ + tlb->freed_tables = 1; \ + __pmd_free_tlb(tlb, pmdp, address); \ + } while (0) +#endif + +#ifndef pud_free_tlb +#define pud_free_tlb(tlb, pudp, address) \ + do { \ + tlb_flush_p4d_range(tlb, address, PAGE_SIZE); \ + tlb->freed_tables = 1; \ + __pud_free_tlb(tlb, pudp, address); \ + } while (0) +#endif + +#ifndef p4d_free_tlb +#define p4d_free_tlb(tlb, pudp, address) \ + do { \ + __tlb_adjust_range(tlb, address, PAGE_SIZE); \ + tlb->freed_tables = 1; \ + __p4d_free_tlb(tlb, pudp, address); \ + } while (0) +#endif + +#ifndef pte_needs_flush +static inline bool pte_needs_flush(pte_t oldpte, pte_t newpte) +{ + return true; +} +#endif + +#ifndef huge_pmd_needs_flush +static inline bool huge_pmd_needs_flush(pmd_t oldpmd, pmd_t newpmd) +{ + return true; +} +#endif + +#ifdef CONFIG_HUGETLB_PMD_PAGE_TABLE_SHARING +static inline void tlb_unshare_pmd_ptdesc(struct mmu_gather *tlb, struct ptdesc *pt, + unsigned long addr) +{ + /* + * The caller must make sure that concurrent unsharing + exclusive + * reuse is impossible until tlb_flush_unshared_tables() was called. + */ + VM_WARN_ON_ONCE(!ptdesc_pmd_is_shared(pt)); + ptdesc_pmd_pts_dec(pt); + + /* Clearing a PUD pointing at a PMD table with PMD leaves. */ + tlb_flush_pmd_range(tlb, addr & PUD_MASK, PUD_SIZE); + + /* + * If the page table is now exclusively owned, we fully unshared + * a page table. + */ + if (!ptdesc_pmd_is_shared(pt)) + tlb->fully_unshared_tables = true; + tlb->unshared_tables = true; +} + +static inline void tlb_flush_unshared_tables(struct mmu_gather *tlb) +{ + /* + * As soon as the caller drops locks to allow for reuse of + * previously-shared tables, these tables could get modified and + * even reused outside of hugetlb context, so we have to make sure that + * any page table walkers (incl. TLB, GUP-fast) are aware of that + * change. + * + * Even if we are not fully unsharing a PMD table, we must + * flush the TLB for the unsharer now. + */ + if (tlb->unshared_tables) + tlb_flush_mmu_tlbonly(tlb); + + /* + * Similarly, we must make sure that concurrent GUP-fast will not + * walk previously-shared page tables that are getting modified+reused + * elsewhere. So broadcast an IPI to wait for any concurrent GUP-fast. + * + * We only perform this when we are the last sharer of a page table, + * as the IPI will reach all CPUs: any GUP-fast. + * + * Note that on configs where tlb_remove_table_sync_one() is a NOP, + * the expectation is that the tlb_flush_mmu_tlbonly() would have issued + * required IPIs already for us. + */ + if (tlb->fully_unshared_tables) { + tlb_remove_table_sync_one(); + tlb->fully_unshared_tables = false; + } +} +#endif /* CONFIG_HUGETLB_PMD_PAGE_TABLE_SHARING */ + +#endif /* CONFIG_MMU */ + +#endif /* _ASM_GENERIC__TLB_H */ |