linux-kernel - Re: [PATCH V3 2/2] riscv: Use use_asid

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Date:   Wed, 26 May 2021 07:23:08 +0200
From:   Christoph Hellwig <hch@....de>
To:     Guo Ren <guoren@...nel.org>
Cc:     Christoph Hellwig <hch@....de>, Anup Patel <anup.patel@....com>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>,
        Arnd Bergmann <arnd@...db.de>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        linux-sunxi@...ts.linux.dev, Guo Ren <guoren@...ux.alibaba.com>
Subject: Re: [PATCH V3 2/2] riscv: Use use_asid_allocator flush TLB

On Wed, May 26, 2021 at 11:12:40AM +0800, Guo Ren wrote:
> > static inline void local_flush_tlb_range_asid(unsigned long start,
> >                 unsigned long size, unsigned long asid)
> >
> > > +{
> > > +     unsigned long tmp = start & PAGE_MASK;
> > > +     unsigned long end = ALIGN(start + size, PAGE_SIZE);
> > > +
> > > +     if (size == -1) {
> > > +             __asm__ __volatile__ ("sfence.vma x0, %0" : : "r" (asid) : "memory");
> > > +             return;
> >
> > Please split the global (size == -1) case into separate helpers.
> Do you mean:

No.  Basically a

static inline void local_flush_tlb_ll_asid(unsigned long asid)
{
	__asm__ __volatile__ ("sfence.vma x0, %0"
				:
				: "r" (asid)
				: "memory");
}

and

static inline void local_flush_tlb_range_asid(unsigned long start,
		unsigned long size, unsigned long asid)

{
	unsigned long end = ALIGN(start + size, PAGE_SIZE), tmp;

	for (tmp = start & PAGE_MASK; tmp < end; tmp += PAGE_SIZE) {
		__asm__ __volatile__ ("sfence.vma %0, %1"
					:
					: "r" (tmp), "r" (asid)
					: "memory");
	}
}