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 X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 50078C43331 for ; Wed, 1 Apr 2020 12:20:14 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 226F320714 for ; Wed, 1 Apr 2020 12:20:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="cgnuQjpW" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 226F320714 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=osNTFys2ODmoESEC0sCADr023PcieKEmNxdxKE01WWM=; b=cgnuQjpWUQ55VI uMrFKgVdz1rhuPVLCxxcXKwrZYW+dIP1w6Hb/TvwDithANxMFj7blQP0uPIcTELi5mKu7Acp9GfgX pl0UR+m/4lIXMYom6l/pfoT6CGpIzi7kCKetliD7wVfHaqfw31qPxZ9OUasZG9cLpxXjK0lHt6BZU BJSVG067gGFUoCgJoF5uISeRAQhqxYmQhjGoRxwjBfNI9dii6ICzkCgJhO/nzwqeRlOLkKe3mKeKg 3gyOja3xdCaGQ6mPTgtTRUwcHGIRJBoj1h/3Y7GihZwSE4fhtC4XpfcKVhHxeP6x0fvOROx0Dd+Fc Rr5j2rqgThbEY9O+fcBg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jJcLt-0007Ca-48; Wed, 01 Apr 2020 12:20:13 +0000 Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jJcLn-0005zJ-TY; Wed, 01 Apr 2020 12:20:08 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id B47C2301631; Wed, 1 Apr 2020 14:20:04 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 7FD8929E261CB; Wed, 1 Apr 2020 14:20:04 +0200 (CEST) Date: Wed, 1 Apr 2020 14:20:04 +0200 From: Peter Zijlstra To: Zhenyu Ye Subject: Re: [RFC PATCH v5 4/8] mm: tlb: Pass struct mmu_gather to flush_pmd_tlb_range Message-ID: <20200401122004.GE20713@hirez.programming.kicks-ass.net> References: <20200331142927.1237-1-yezhenyu2@huawei.com> <20200331142927.1237-5-yezhenyu2@huawei.com> <20200331151331.GS20730@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, catalin.marinas@arm.com, linux-mm@kvack.org, guohanjun@huawei.com, will@kernel.org, linux-arch@vger.kernel.org, yuzhao@google.com, corbet@lwn.net, maz@kernel.org, steven.price@arm.com, arm@kernel.org, Dave.Martin@arm.com, arnd@arndb.de, suzuki.poulose@arm.com, npiggin@gmail.com, zhangshaokun@hisilicon.com, broonie@kernel.org, rostedt@goodmis.org, prime.zeng@hisilicon.com, kuhn.chenqun@huawei.com, tglx@linutronix.de, linux-arm-kernel@lists.infradead.org, xiexiangyou@huawei.com, tony.luck@intel.com, vgupta@synopsys.com, linux-kernel@vger.kernel.org, aneesh.kumar@linux.ibm.com, akpm@linux-foundation.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Apr 01, 2020 at 04:51:15PM +0800, Zhenyu Ye wrote: > On 2020/3/31 23:13, Peter Zijlstra wrote: > > Instead of trying to retro-fit flush_*tlb_range() to take an mmu_gather > > parameter, please replace them out-right. > > > > I'm sorry that I'm not sure what "replace them out-right" means. Do you > mean that I should define flush_*_tlb_range like this? > > #define flush_pmd_tlb_range(vma, addr, end) \ > do { \ > struct mmu_gather tlb; \ > tlb_gather_mmu(&tlb, (vma)->vm_mm, addr, end); \ > tlba.cleared_pmds = 1; \ > flush_tlb_range(&tlb, vma, addr, end); \ > tlb_finish_mmu(&tlb, addr, end); \ > } while (0) > I was thinking to remove flush_*tlb_range() entirely (from generic code). And specifically to not use them like the above; instead extend the mmu_gather API. Specifically, if you wanted to express flush_pmd_tlb_range() in mmu gather, you'd write it like: static inline void flush_pmd_tlb_range(struct vm_area_struct *vma, unsigned long addr, unsigned long end) { struct mmu_gather tlb; tlb_gather_mmu(&tlb, vma->vm_mm, addr, end); tlb_start_vma(&tlb, vma); tlb.cleared_pmds = 1; __tlb_adjust_range(addr, end - addr); tlb_end_vma(&tlb, vma); tlb_finish_mmu(&tlb, addr, end); } Except of course, that the code between start_vma and end_vma is not a proper mmu_gather API. So maybe add: tlb_flush_{pte,pmd,pud,p4d}_range() Then we can write: static inline void flush_XXX_tlb_range(struct vm_area_struct *vma, unsigned long addr, unsigned long end) { struct mmu_gather tlb; tlb_gather_mmu(&tlb, vma->vm_mm, addr, end); tlb_start_vma(&tlb, vma); tlb_flush_XXX_range(&tlb, addr, end - addr); tlb_end_vma(&tlb, vma); tlb_finish_mmu(&tlb, addr, end); } But when I look at the output of: git grep flush_.*tlb_range -- :^arch/ I doubt it makes sense to provide wrappers like the above. ( Also, we should probably remove the (addr, end) arguments from tlb_finish_mmu(), Will? ) --- diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h index f391f6b500b4..be5452a8efaa 100644 --- a/include/asm-generic/tlb.h +++ b/include/asm-generic/tlb.h @@ -511,6 +511,34 @@ static inline void tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vm } #endif +static inline void tlb_flush_pte_range(struct mmu_gather *tlb, + unsigned long address, unsigned long size) +{ + __tlb_adjust_range(tlb, address, size); + tlb->cleared_ptes = 1; +} + +static inline void tlb_flush_pmd_range(struct mmu_gather *tlb, + unsigned long address, unsigned long size) +{ + __tlb_adjust_range(tlb, address, size); + tlb->cleared_pmds = 1; +} + +static inline void tlb_flush_pud_range(struct mmu_gather *tlb, + unsigned long address, unsigned long size) +{ + __tlb_adjust_range(tlb, address, size); + tlb->cleared_puds = 1; +} + +static inline void tlb_flush_p4d_range(struct mmu_gather *tlb, + unsigned long address, unsigned long size) +{ + __tlb_adjust_range(tlb, address, size); + tlb->cleared_p4ds = 1; +} + #ifndef __tlb_remove_tlb_entry #define __tlb_remove_tlb_entry(tlb, ptep, address) do { } while (0) #endif @@ -524,8 +552,7 @@ static inline void tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vm */ #define tlb_remove_tlb_entry(tlb, ptep, address) \ do { \ - __tlb_adjust_range(tlb, address, PAGE_SIZE); \ - tlb->cleared_ptes = 1; \ + tlb_flush_pte_range(tlb, address, PAGE_SIZE); \ __tlb_remove_tlb_entry(tlb, ptep, address); \ } while (0) @@ -550,8 +577,7 @@ static inline void tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vm #define tlb_remove_pmd_tlb_entry(tlb, pmdp, address) \ do { \ - __tlb_adjust_range(tlb, address, HPAGE_PMD_SIZE); \ - tlb->cleared_pmds = 1; \ + tlb_flush_pmd_range(tlb, address, HPAGE_PMD_SIZE); \ __tlb_remove_pmd_tlb_entry(tlb, pmdp, address); \ } while (0) @@ -565,8 +591,7 @@ static inline void tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vm #define tlb_remove_pud_tlb_entry(tlb, pudp, address) \ do { \ - __tlb_adjust_range(tlb, address, HPAGE_PUD_SIZE); \ - tlb->cleared_puds = 1; \ + tlb_flush_pud_range(tlb, address, HPAGE_PUD_SIZE); \ __tlb_remove_pud_tlb_entry(tlb, pudp, address); \ } while (0) _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel