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| author | Peter Zijlstra <peterz@infradead.org> | 2020-02-04 02:36:49 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-02-04 04:05:26 +0100 |
| commit | 0ed1325967ab5f7a4549a2641c6ebe115f76e228 (patch) | |
| tree | d8374c4245c4aa0faff50b5e9fae4ec55bcfce13 /arch | |
| parent | powerpc/mmu_gather: enable RCU_TABLE_FREE even for !SMP case (diff) | |
| download | linux-0ed1325967ab5f7a4549a2641c6ebe115f76e228.tar.xz linux-0ed1325967ab5f7a4549a2641c6ebe115f76e228.zip | |
mm/mmu_gather: invalidate TLB correctly on batch allocation failure and flush
Architectures for which we have hardware walkers of Linux page table
should flush TLB on mmu gather batch allocation failures and batch flush.
Some architectures like POWER supports multiple translation modes (hash
and radix) and in the case of POWER only radix translation mode needs the
above TLBI. This is because for hash translation mode kernel wants to
avoid this extra flush since there are no hardware walkers of linux page
table. With radix translation, the hardware also walks linux page table
and with that, kernel needs to make sure to TLB invalidate page walk cache
before page table pages are freed.
More details in commit d86564a2f085 ("mm/tlb, x86/mm: Support invalidating
TLB caches for RCU_TABLE_FREE")
The changes to sparc are to make sure we keep the old behavior since we
are now removing HAVE_RCU_TABLE_NO_INVALIDATE. The default value for
tlb_needs_table_invalidate is to always force an invalidate and sparc can
avoid the table invalidate. Hence we define tlb_needs_table_invalidate to
false for sparc architecture.
Link: http://lkml.kernel.org/r/20200116064531.483522-3-aneesh.kumar@linux.ibm.com
Fixes: a46cc7a90fd8 ("powerpc/mm/radix: Improve TLB/PWC flushes")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> [powerpc]
Cc: <stable@vger.kernel.org> [4.14+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/Kconfig | 3 | ||||
| -rw-r--r-- | arch/powerpc/Kconfig | 1 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/tlb.h | 11 | ||||
| -rw-r--r-- | arch/sparc/Kconfig | 1 | ||||
| -rw-r--r-- | arch/sparc/include/asm/tlb_64.h | 9 |
5 files changed, 20 insertions, 5 deletions
diff --git a/arch/Kconfig b/arch/Kconfig index 48b5e103bdb0..208aad121630 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -396,9 +396,6 @@ config HAVE_ARCH_JUMP_LABEL_RELATIVE config HAVE_RCU_TABLE_FREE bool -config HAVE_RCU_TABLE_NO_INVALIDATE - bool - config HAVE_MMU_GATHER_PAGE_SIZE bool diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 54b7f2af7cb1..c22ed1fe275d 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -223,7 +223,6 @@ config PPC select HAVE_PERF_REGS select HAVE_PERF_USER_STACK_DUMP select HAVE_RCU_TABLE_FREE - select HAVE_RCU_TABLE_NO_INVALIDATE if HAVE_RCU_TABLE_FREE select HAVE_MMU_GATHER_PAGE_SIZE select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN diff --git a/arch/powerpc/include/asm/tlb.h b/arch/powerpc/include/asm/tlb.h index b2c0be93929d..7f3a8b902325 100644 --- a/arch/powerpc/include/asm/tlb.h +++ b/arch/powerpc/include/asm/tlb.h @@ -26,6 +26,17 @@ #define tlb_flush tlb_flush extern void tlb_flush(struct mmu_gather *tlb); +/* + * book3s: + * Hash does not use the linux page-tables, so we can avoid + * the TLB invalidate for page-table freeing, Radix otoh does use the + * page-tables and needs the TLBI. + * + * nohash: + * We still do TLB invalidate in the __pte_free_tlb routine before we + * add the page table pages to mmu gather table batch. + */ +#define tlb_needs_table_invalidate() radix_enabled() /* Get the generic bits... */ #include <asm-generic/tlb.h> diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig index e8c3ea01c12f..7b9b3a954a76 100644 --- a/arch/sparc/Kconfig +++ b/arch/sparc/Kconfig @@ -65,7 +65,6 @@ config SPARC64 select HAVE_KRETPROBES select HAVE_KPROBES select HAVE_RCU_TABLE_FREE if SMP - select HAVE_RCU_TABLE_NO_INVALIDATE if HAVE_RCU_TABLE_FREE select HAVE_MEMBLOCK_NODE_MAP select HAVE_ARCH_TRANSPARENT_HUGEPAGE select HAVE_DYNAMIC_FTRACE diff --git a/arch/sparc/include/asm/tlb_64.h b/arch/sparc/include/asm/tlb_64.h index a2f3fa61ee36..8cb8f3833239 100644 --- a/arch/sparc/include/asm/tlb_64.h +++ b/arch/sparc/include/asm/tlb_64.h @@ -28,6 +28,15 @@ void flush_tlb_pending(void); #define __tlb_remove_tlb_entry(tlb, ptep, address) do { } while (0) #define tlb_flush(tlb) flush_tlb_pending() +/* + * SPARC64's hardware TLB fill does not use the Linux page-tables + * and therefore we don't need a TLBI when freeing page-table pages. + */ + +#ifdef CONFIG_HAVE_RCU_TABLE_FREE +#define tlb_needs_table_invalidate() (false) +#endif + #include <asm-generic/tlb.h> #endif /* _SPARC64_TLB_H */ |