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Merge branch 'core-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull unified TLB flushing from Ingo Molnar:
 "This contains the generic mmu_gather feature from Peter Zijlstra,
  which is an all-arch unification of TLB flushing APIs, via the
  following (broad) steps:

   - enhance the <asm-generic/tlb.h> APIs to cover more arch details

   - convert most TLB flushing arch implementations to the generic
     <asm-generic/tlb.h> APIs.

   - remove leftovers of per arch implementations

  After this series every single architecture makes use of the unified
  TLB flushing APIs"

* 'core-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  mm/resource: Use resource_overlaps() to simplify region_intersects()
  ia64/tlb: Eradicate tlb_migrate_finish() callback
  asm-generic/tlb: Remove tlb_table_flush()
  asm-generic/tlb: Remove tlb_flush_mmu_free()
  asm-generic/tlb: Remove CONFIG_HAVE_GENERIC_MMU_GATHER
  asm-generic/tlb: Remove arch_tlb*_mmu()
  s390/tlb: Convert to generic mmu_gather
  asm-generic/tlb: Introduce CONFIG_HAVE_MMU_GATHER_NO_GATHER=y
  arch/tlb: Clean up simple architectures
  um/tlb: Convert to generic mmu_gather
  sh/tlb: Convert SH to generic mmu_gather
  ia64/tlb: Convert to generic mmu_gather
  arm/tlb: Convert to generic mmu_gather
  asm-generic/tlb, arch: Invert CONFIG_HAVE_RCU_TABLE_INVALIDATE
  asm-generic/tlb, ia64: Conditionally provide tlb_migrate_finish()
  asm-generic/tlb: Provide generic tlb_flush() based on flush_tlb_mm()
  asm-generic/tlb, arch: Provide generic tlb_flush() based on flush_tlb_range()
  asm-generic/tlb, arch: Provide generic VIPT cache flush
  asm-generic/tlb, arch: Provide CONFIG_HAVE_MMU_GATHER_PAGE_SIZE
  asm-generic/tlb: Provide a comment
This commit is contained in:
Linus Torvalds
2019-05-06 11:36:58 -07:00
parent 423ea32554 f6c6010a07
commit 171c2bcbcb
55 changed files with 483 additions and 1297 deletions
Download Patch File Download Diff File Expand all files Collapse all files

158
arch/um/include/asm/tlb.h
View File

@@ -2,162 +2,8 @@
#ifndef __UM_TLB_H
#define __UM_TLB_H
#include <linux/pagemap.h>
#include <linux/swap.h>
#include <asm/percpu.h>
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
#define tlb_start_vma(tlb, vma) do { } while (0)
#define tlb_end_vma(tlb, vma) do { } while (0)
#define tlb_flush(tlb) flush_tlb_mm((tlb)->mm)
/* 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;
unsigned int need_flush; /* Really unmapped some ptes? */
unsigned long start;
unsigned long end;
unsigned int fullmm; /* non-zero means full mm flush */
};
static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep,
unsigned long address)
{
if (tlb->start > address)
tlb->start = address;
if (tlb->end < address + PAGE_SIZE)
tlb->end = address + PAGE_SIZE;
}
static inline void init_tlb_gather(struct mmu_gather *tlb)
{
tlb->need_flush = 0;
tlb->start = TASK_SIZE;
tlb->end = 0;
if (tlb->fullmm) {
tlb->start = 0;
tlb->end = TASK_SIZE;
}
}
static inline void
arch_tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm,
unsigned long start, unsigned long end)
{
tlb->mm = mm;
tlb->start = start;
tlb->end = end;
tlb->fullmm = !(start | (end+1));
init_tlb_gather(tlb);
}
extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
unsigned long end);
static inline void
tlb_flush_mmu_tlbonly(struct mmu_gather *tlb)
{
flush_tlb_mm_range(tlb->mm, tlb->start, tlb->end);
}
static inline void
tlb_flush_mmu_free(struct mmu_gather *tlb)
{
init_tlb_gather(tlb);
}
static inline void
tlb_flush_mmu(struct mmu_gather *tlb)
{
if (!tlb->need_flush)
return;
tlb_flush_mmu_tlbonly(tlb);
tlb_flush_mmu_free(tlb);
}
/* arch_tlb_finish_mmu
* Called at the end of the shootdown operation to free up any resources
* that were required.
*/
static inline void
arch_tlb_finish_mmu(struct mmu_gather *tlb,
unsigned long start, unsigned long end, bool force)
{
if (force) {
tlb->start = start;
tlb->end = end;
tlb->need_flush = 1;
}
tlb_flush_mmu(tlb);
/* keep the page table cache within bounds */
check_pgt_cache();
}
/* tlb_remove_page
* Must perform the equivalent to __free_pte(pte_get_and_clear(ptep)),
* while handling the additional races in SMP caused by other CPUs
* caching valid mappings in their TLBs.
*/
static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
{
tlb->need_flush = 1;
free_page_and_swap_cache(page);
return false; /* avoid calling tlb_flush_mmu */
}
static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
{
__tlb_remove_page(tlb, page);
}
static inline bool __tlb_remove_page_size(struct mmu_gather *tlb,
struct page *page, int page_size)
{
return __tlb_remove_page(tlb, page);
}
static inline void tlb_remove_page_size(struct mmu_gather *tlb,
struct page *page, int page_size)
{
return tlb_remove_page(tlb, page);
}
/**
* tlb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation.
*
* Record the fact that pte's were really umapped in ->need_flush, 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->need_flush = 1; \
__tlb_remove_tlb_entry(tlb, ptep, address); \
} while (0)
#define tlb_remove_huge_tlb_entry(h, tlb, ptep, address) \
tlb_remove_tlb_entry(tlb, ptep, address)
#define tlb_remove_check_page_size_change tlb_remove_check_page_size_change
static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb,
unsigned int page_size)
{
}
#define pte_free_tlb(tlb, ptep, addr) __pte_free_tlb(tlb, ptep, addr)
#define pud_free_tlb(tlb, pudp, addr) __pud_free_tlb(tlb, pudp, addr)
#define pmd_free_tlb(tlb, pmdp, addr) __pmd_free_tlb(tlb, pmdp, addr)
#define tlb_migrate_finish(mm) do {} while (0)
#include <asm-generic/cacheflush.h>
#include <asm-generic/tlb.h>
#endif