Messages in this thread |  | | Date | Mon, 20 Apr 2020 14:10:55 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH v1 6/6] arm64: tlb: Set the TTL field in flush_tlb_range |
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On Fri, Apr 03, 2020 at 05:00:48PM +0800, Zhenyu Ye wrote: > This patch uses the cleared_* in struct mmu_gather to set the > TTL field in flush_tlb_range(). > > Signed-off-by: Zhenyu Ye <yezhenyu2@huawei.com> > --- > arch/arm64/include/asm/tlb.h | 26 +++++++++++++++++++++++++- > arch/arm64/include/asm/tlbflush.h | 14 ++++++++------ > 2 files changed, 33 insertions(+), 7 deletions(-) > > diff --git a/arch/arm64/include/asm/tlb.h b/arch/arm64/include/asm/tlb.h > index b76df828e6b7..d5ab72eccff4 100644 > --- a/arch/arm64/include/asm/tlb.h > +++ b/arch/arm64/include/asm/tlb.h > @@ -21,11 +21,34 @@ static void tlb_flush(struct mmu_gather *tlb); > > #include <asm-generic/tlb.h> > > +/* > + * get the tlbi levels in arm64. Default value is 0 if more than one > + * of cleared_* is set or neither is set. > + * Arm64 doesn't support p4ds now. > + */ > +static inline int tlb_get_level(struct mmu_gather *tlb) > +{ > + int sum = tlb->cleared_ptes + tlb->cleared_pmds + > + tlb->cleared_puds + tlb->cleared_p4ds; > + > + if (sum != 1) > + return 0; > + else if (tlb->cleared_ptes) > + return 3; > + else if (tlb->cleared_pmds) > + return 2; > + else if (tlb->cleared_puds) > + return 1; > + > + return 0; > +}
That's some mighty wonky code. Please look at the generated asm.
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