From nobody Thu Dec 18 18:51:21 2025 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 A8C22C77B78 for ; Fri, 14 Apr 2023 17:29:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230338AbjDNR3k (ORCPT ); Fri, 14 Apr 2023 13:29:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51132 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230304AbjDNR3c (ORCPT ); Fri, 14 Apr 2023 13:29:32 -0400 Received: from mail-io1-xd4a.google.com (mail-io1-xd4a.google.com [IPv6:2607:f8b0:4864:20::d4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EE6D983CF for ; Fri, 14 Apr 2023 10:29:27 -0700 (PDT) Received: by mail-io1-xd4a.google.com with SMTP id t2-20020a6bc302000000b00760c588931aso817315iof.22 for ; Fri, 14 Apr 2023 10:29:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1681493367; x=1684085367; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=m1kZE+I4lCokEPTtuViylzrsjbyFZVriw/+IDTkdUZs=; b=wKAqTp0gCgCpvOk94vxoajpDy1Jwz98+EewdQmmSdhNqE2Jlk4VMvFAu5B8crUN4Dz h96GsoqGDRzHtHUkMg6TRiTh4WIycBwd9t3vPEADx97JkaEUt1YUmkVQjkw+TnbTXKKd AxmO1vjU0CzLrwsCbVvYNXNvP9uvDkbcfKCBKrGd88fzD+2Y2DA2uBNAejUQU8EQbRS5 Ak8gLtAu43PdrBZqXK+3Bt/JY6WS0m7v1Ig9rOXjI0tIgXNOEsAlE+nD3NTxcG+IL6Jr wRbed8j8LkgwlnnhSGHgtvO6fBEooaanIBc8nxPZ6QO8tgEdlEEw1bcTchIOEpnQVHC9 lgcg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1681493367; x=1684085367; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=m1kZE+I4lCokEPTtuViylzrsjbyFZVriw/+IDTkdUZs=; b=SQHJshbQc8Vncfyw40XYpN09Tuocx/JFpObv2niBZGgjdwGAP+magqOlJhTeR2lrCe uuQS4futgV3Y5hXbLhmi6cwY5ZHZPzRBFe6ID/oPNEPKNoS/u3a606B1qmlUc4TRnh7j 2Ao6EocO+Rgn95/yTZguuWsKS4zxM6h2C5dfOBFaiXipuGYmE0vSGHLFddWcziGFFo0r V72LinkfXSw8KNJCsXmIgktBsYCVH8PpmnbLnF0m9L9AW3B8fE9EqFhdjnKGG8x05XVz jFg2YzPH4WIeRI46N1V+77JpXyFwAXTv/rF6nbGuAgMnl5ctjGyygkinvLF87ALJbjaE 61pw== X-Gm-Message-State: AAQBX9fDjSYbEyygkW0NXdzi5tnUoCUjyAW8seu6GIfdZE1XweZm6d3i l2WY7DW4s6vLq1S0S9gFw570ualuvLu9 X-Google-Smtp-Source: AKy350Yddd2lwEeWhxMenGEg3cSJzJsTClfQ0/zSbWeiRrRDBV4gIVJaV1PJNPipYcDx7Jss85J4DCGudYVM X-Received: from rananta-linux.c.googlers.com ([fda3:e722:ac3:cc00:2b:ff92:c0a8:22b5]) (user=rananta job=sendgmr) by 2002:a02:63ca:0:b0:40b:c01e:6d0f with SMTP id j193-20020a0263ca000000b0040bc01e6d0fmr2100031jac.2.1681493367400; Fri, 14 Apr 2023 10:29:27 -0700 (PDT) Date: Fri, 14 Apr 2023 17:29:16 +0000 In-Reply-To: <20230414172922.812640-1-rananta@google.com> Mime-Version: 1.0 References: <20230414172922.812640-1-rananta@google.com> X-Mailer: git-send-email 2.40.0.634.g4ca3ef3211-goog Message-ID: <20230414172922.812640-2-rananta@google.com> Subject: [PATCH v3 1/7] arm64: tlb: Refactor the core flush algorithm of __flush_tlb_range From: Raghavendra Rao Ananta To: Oliver Upton , Marc Zyngier , James Morse , Suzuki K Poulose Cc: Ricardo Koller , Paolo Bonzini , Jing Zhang , Colton Lewis , Raghavendra Rao Anata , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Currently, the core TLB flush functionality of __flush_tlb_range() hardcodes vae1is (and variants) for the flush operation. In the upcoming patches, the KVM code reuses this core algorithm with ipas2e1is for range based TLB invalidations based on the IPA. Hence, extract the core flush functionality of __flush_tlb_range() into its own macro that accepts an 'op' argument to pass any TLBI operation, such that other callers (KVM) can benefit. No functional changes intended. Signed-off-by: Raghavendra Rao Ananta Reviewed-by: Catalin Marinas --- arch/arm64/include/asm/tlbflush.h | 108 +++++++++++++++--------------- 1 file changed, 55 insertions(+), 53 deletions(-) diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlb= flush.h index 412a3b9a3c25d..4775378b6da1b 100644 --- a/arch/arm64/include/asm/tlbflush.h +++ b/arch/arm64/include/asm/tlbflush.h @@ -278,14 +278,61 @@ static inline void flush_tlb_page(struct vm_area_stru= ct *vma, */ #define MAX_TLBI_OPS PTRS_PER_PTE =20 +/* When the CPU does not support TLB range operations, flush the TLB + * entries one by one at the granularity of 'stride'. If the TLB + * range ops are supported, then: + * + * 1. If 'pages' is odd, flush the first page through non-range + * operations; + * + * 2. For remaining pages: the minimum range granularity is decided + * by 'scale', so multiple range TLBI operations may be required. + * Start from scale =3D 0, flush the corresponding number of pages + * ((num+1)*2^(5*scale+1) starting from 'addr'), then increase it + * until no pages left. + * + * Note that certain ranges can be represented by either num =3D 31 and + * scale or num =3D 0 and scale + 1. The loop below favours the latter + * since num is limited to 30 by the __TLBI_RANGE_NUM() macro. + */ +#define __flush_tlb_range_op(op, start, pages, stride, \ + asid, tlb_level, tlbi_user) do { \ + int num =3D 0; \ + int scale =3D 0; \ + unsigned long addr; \ + \ + while (pages > 0) { \ + if (!system_supports_tlb_range() || \ + pages % 2 =3D=3D 1) { \ + addr =3D __TLBI_VADDR(start, asid); \ + __tlbi_level(op, addr, tlb_level); \ + if (tlbi_user) \ + __tlbi_user_level(op, addr, tlb_level); \ + start +=3D stride; \ + pages -=3D stride >> PAGE_SHIFT; \ + continue; \ + } \ + \ + num =3D __TLBI_RANGE_NUM(pages, scale); \ + if (num >=3D 0) { \ + addr =3D __TLBI_VADDR_RANGE(start, asid, scale, \ + num, tlb_level); \ + __tlbi(r##op, addr); \ + if (tlbi_user) \ + __tlbi_user(r##op, addr); \ + start +=3D __TLBI_RANGE_PAGES(num, scale) << PAGE_SHIFT; \ + pages -=3D __TLBI_RANGE_PAGES(num, scale); \ + } \ + scale++; \ + } \ +} while (0) + static inline void __flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end, unsigned long stride, bool last_level, int tlb_level) { - int num =3D 0; - int scale =3D 0; - unsigned long asid, addr, pages; + unsigned long asid, pages; =20 start =3D round_down(start, stride); end =3D round_up(end, stride); @@ -307,56 +354,11 @@ static inline void __flush_tlb_range(struct vm_area_s= truct *vma, dsb(ishst); asid =3D ASID(vma->vm_mm); =20 - /* - * When the CPU does not support TLB range operations, flush the TLB - * entries one by one at the granularity of 'stride'. If the TLB - * range ops are supported, then: - * - * 1. If 'pages' is odd, flush the first page through non-range - * operations; - * - * 2. For remaining pages: the minimum range granularity is decided - * by 'scale', so multiple range TLBI operations may be required. - * Start from scale =3D 0, flush the corresponding number of pages - * ((num+1)*2^(5*scale+1) starting from 'addr'), then increase it - * until no pages left. - * - * Note that certain ranges can be represented by either num =3D 31 and - * scale or num =3D 0 and scale + 1. The loop below favours the latter - * since num is limited to 30 by the __TLBI_RANGE_NUM() macro. - */ - while (pages > 0) { - if (!system_supports_tlb_range() || - pages % 2 =3D=3D 1) { - addr =3D __TLBI_VADDR(start, asid); - if (last_level) { - __tlbi_level(vale1is, addr, tlb_level); - __tlbi_user_level(vale1is, addr, tlb_level); - } else { - __tlbi_level(vae1is, addr, tlb_level); - __tlbi_user_level(vae1is, addr, tlb_level); - } - start +=3D stride; - pages -=3D stride >> PAGE_SHIFT; - continue; - } - - num =3D __TLBI_RANGE_NUM(pages, scale); - if (num >=3D 0) { - addr =3D __TLBI_VADDR_RANGE(start, asid, scale, - num, tlb_level); - if (last_level) { - __tlbi(rvale1is, addr); - __tlbi_user(rvale1is, addr); - } else { - __tlbi(rvae1is, addr); - __tlbi_user(rvae1is, addr); - } - start +=3D __TLBI_RANGE_PAGES(num, scale) << PAGE_SHIFT; - pages -=3D __TLBI_RANGE_PAGES(num, scale); - } - scale++; - } + if (last_level) + __flush_tlb_range_op(vale1is, start, pages, stride, asid, tlb_level, tru= e); + else + __flush_tlb_range_op(vae1is, start, pages, stride, asid, tlb_level, true= ); + dsb(ish); } =20 --=20 2.40.0.634.g4ca3ef3211-goog