From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 26106C6FD1D for ; Wed, 15 Mar 2023 10:11:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232317AbjCOKLa (ORCPT ); Wed, 15 Mar 2023 06:11:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40312 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231674AbjCOKLA (ORCPT ); Wed, 15 Mar 2023 06:11:00 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 522157D9A; Wed, 15 Mar 2023 03:10:24 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id C8D0E61CCE; Wed, 15 Mar 2023 10:10:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 88760C433D2; Wed, 15 Mar 2023 10:10:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1678875023; bh=t6+L9+5TgsgHD5i71rZ4I1fBe7Dw8QjjaTgllTsJASg=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=FTfI9Axm5wAnGiuKp4LdSxj2zUd4+mexU7PMy/4ZvlZVAgRtgmuiSsKsrmAW/5JQ3 Nx1+DYd12ijh+vY+2MMUj8nuQgQ5OedPPjhU8pNWewdow+wptVBXcwkFw4Bp4lSpet 2soyzjifgj7cmNt/GzZpy1UpdUFQVMDzDg++8igWTouxWPqD+LEpYiFyE2Xgb2LCBW K42eDy6enK3rwqfFgLk8LIX18zMm2M8KEEACm/dcfJeoqEkQSISLHqOj6ibsLibzP4 k+UaGeEDysFGEkPgfLQLqMgjLo3PqOdrUooNDmr87ylEWSdVmuLT3ijf8vnE5TGh2S CVUBTV2pOGODQ== Date: Wed, 15 Mar 2023 12:10:09 +0200 From: Mike Rapoport To: "Matthew Wilcox (Oracle)" Cc: linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Alexandre Ghiti , Paul Walmsley , Palmer Dabbelt , Albert Ou , linux-riscv@lists.infradead.org Subject: Re: [PATCH v4 21/36] riscv: Implement the new page table range API Message-ID: References: <20230315051444.3229621-1-willy@infradead.org> <20230315051444.3229621-22-willy@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230315051444.3229621-22-willy@infradead.org> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Mar 15, 2023 at 05:14:29AM +0000, Matthew Wilcox (Oracle) wrote: > Add set_ptes(), update_mmu_cache_range() and flush_dcache_folio(). > Change the PG_dcache_clean flag from being per-page to per-folio. > > Signed-off-by: Matthew Wilcox (Oracle) > Reviewed-by: Alexandre Ghiti > Cc: Paul Walmsley > Cc: Palmer Dabbelt > Cc: Albert Ou > Cc: linux-riscv@lists.infradead.org Acked-by: Mike Rapoport (IBM) > --- > arch/riscv/include/asm/cacheflush.h | 19 +++++++++---------- > arch/riscv/include/asm/pgtable.h | 26 +++++++++++++++++++------- > arch/riscv/mm/cacheflush.c | 11 ++--------- > 3 files changed, 30 insertions(+), 26 deletions(-) > > diff --git a/arch/riscv/include/asm/cacheflush.h b/arch/riscv/include/asm/cacheflush.h > index 03e3b95ae6da..10e5e96f09b5 100644 > --- a/arch/riscv/include/asm/cacheflush.h > +++ b/arch/riscv/include/asm/cacheflush.h > @@ -15,20 +15,19 @@ static inline void local_flush_icache_all(void) > > #define PG_dcache_clean PG_arch_1 > > -static inline void flush_dcache_page(struct page *page) > +static inline void flush_dcache_folio(struct folio *folio) > { > - /* > - * HugeTLB pages are always fully mapped and only head page will be > - * set PG_dcache_clean (see comments in flush_icache_pte()). > - */ > - if (PageHuge(page)) > - page = compound_head(page); > - > - if (test_bit(PG_dcache_clean, &page->flags)) > - clear_bit(PG_dcache_clean, &page->flags); > + if (test_bit(PG_dcache_clean, &folio->flags)) > + clear_bit(PG_dcache_clean, &folio->flags); > } > +#define flush_dcache_folio flush_dcache_folio > #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1 > > +static inline void flush_dcache_page(struct page *page) > +{ > + flush_dcache_folio(page_folio(page)); > +} > + > /* > * RISC-V doesn't have an instruction to flush parts of the instruction cache, > * so instead we just flush the whole thing. > diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h > index b516f3b59616..b077bc8c498c 100644 > --- a/arch/riscv/include/asm/pgtable.h > +++ b/arch/riscv/include/asm/pgtable.h > @@ -405,8 +405,8 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) > > > /* Commit new configuration to MMU hardware */ > -static inline void update_mmu_cache(struct vm_area_struct *vma, > - unsigned long address, pte_t *ptep) > +static inline void update_mmu_cache_range(struct vm_area_struct *vma, > + unsigned long address, pte_t *ptep, unsigned int nr) > { > /* > * The kernel assumes that TLBs don't cache invalid entries, but > @@ -415,8 +415,11 @@ static inline void update_mmu_cache(struct vm_area_struct *vma, > * Relying on flush_tlb_fix_spurious_fault would suffice, but > * the extra traps reduce performance. So, eagerly SFENCE.VMA. > */ > - local_flush_tlb_page(address); > + while (nr--) > + local_flush_tlb_page(address + nr * PAGE_SIZE); > } > +#define update_mmu_cache(vma, addr, ptep) \ > + update_mmu_cache_range(vma, addr, ptep, 1) > > #define __HAVE_ARCH_UPDATE_MMU_TLB > #define update_mmu_tlb update_mmu_cache > @@ -456,12 +459,21 @@ static inline void __set_pte_at(struct mm_struct *mm, > set_pte(ptep, pteval); > } > > -static inline void set_pte_at(struct mm_struct *mm, > - unsigned long addr, pte_t *ptep, pte_t pteval) > +static inline void set_ptes(struct mm_struct *mm, unsigned long addr, > + pte_t *ptep, pte_t pteval, unsigned int nr) > { > - page_table_check_ptes_set(mm, addr, ptep, pteval, 1); > - __set_pte_at(mm, addr, ptep, pteval); > + page_table_check_ptes_set(mm, addr, ptep, pteval, nr); > + > + for (;;) { > + __set_pte_at(mm, addr, ptep, pteval); > + if (--nr == 0) > + break; > + ptep++; > + addr += PAGE_SIZE; > + pte_val(pteval) += 1 << _PAGE_PFN_SHIFT; > + } > } > +#define set_ptes set_ptes > > static inline void pte_clear(struct mm_struct *mm, > unsigned long addr, pte_t *ptep) > diff --git a/arch/riscv/mm/cacheflush.c b/arch/riscv/mm/cacheflush.c > index fcd6145fbead..e36a851e5788 100644 > --- a/arch/riscv/mm/cacheflush.c > +++ b/arch/riscv/mm/cacheflush.c > @@ -81,16 +81,9 @@ void flush_icache_mm(struct mm_struct *mm, bool local) > #ifdef CONFIG_MMU > void flush_icache_pte(pte_t pte) > { > - struct page *page = pte_page(pte); > + struct folio *folio = page_folio(pte_page(pte)); > > - /* > - * HugeTLB pages are always fully mapped, so only setting head page's > - * PG_dcache_clean flag is enough. > - */ > - if (PageHuge(page)) > - page = compound_head(page); > - > - if (!test_bit(PG_dcache_clean, &page->flags)) { > + if (!test_bit(PG_dcache_clean, &folio->flags)) { > flush_icache_all(); > set_bit(PG_dcache_clean, &page->flags); > } > -- > 2.39.2 > > > _______________________________________________ > linux-riscv mailing list > linux-riscv@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-riscv -- Sincerely yours, Mike.