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mm/mmu_gather: add tlb_remove_tlb_entries() 

Let's add a helper that lets us batch-process multiple consecutive PTEs.

Note that the loop will get optimized out on all architectures except on
powerpc.  We have to add an early define of __tlb_remove_tlb_entry() on
ppc to make the compiler happy (and avoid making tlb_remove_tlb_entries()
a macro).

[arnd@kernel.org: change __tlb_remove_tlb_entry() to an inline function]
  Link: https://lkml.kernel.org/r/20240221154549.2026073-1-arnd@kernel.org
Link: https://lkml.kernel.org/r/20240214204435.167852-8-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@suse.com>
Cc: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yin Fengwei <fengwei.yin@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
David Hildenbrand 2024-02-14 21:44:32 +01:00 committed by Andrew Morton
parent da510964c0
commit 4d5bf0b618
2 changed files with 25 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/include/asm/tlb.h
View File

@ -19,6 +19,8 @@
#include <linux/pagemap.h>
static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep,
unsigned long address);
#define __tlb_remove_tlb_entry __tlb_remove_tlb_entry
#define tlb_flush tlb_flush

24
include/asm-generic/tlb.h
View File

@ -592,7 +592,9 @@ static inline void tlb_flush_p4d_range(struct mmu_gather *tlb,
}
#ifndef __tlb_remove_tlb_entry
#define __tlb_remove_tlb_entry(tlb, ptep, address) do { } while (0)
static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long address)
{
}
#endif
/**
@ -608,6 +610,26 @@ static inline void tlb_flush_p4d_range(struct mmu_gather *tlb,
__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); \