From patchwork Sun May 30 16:49:25 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guo Ren X-Patchwork-Id: 12288385 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=-17.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 031B7C47093 for ; Sun, 30 May 2021 16:50:43 +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 BA97F61108 for ; Sun, 30 May 2021 16:50:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BA97F61108 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-riscv-bounces+linux-riscv=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.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:List-Subscribe:List-Help: List-Post:List-Archive:List-Unsubscribe:List-Id:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=7Q37iF7PmHCpK8gNqbPvaKLdmi1fmkE99gcVqtMYfUY=; b=wlVYDmrVaqhRLE q3jDMlp65k2rCg5jVbVcOO2gw9EeF7BT4H2GcSJ9QS6d4WoJoZa87AxCXIsFE/LQGnYAFMbcMEZ7t SJw5wcAADEj/hIYF3XmefxPLv9WvBbiEt9WH9MRbaII3OY1XfZZUTAWUJJiD/z96GDvOPRzRiwVuf v2SihcJnlsWf9b/57dy9Y3XirIi6WK73wn5yjmnR7oRFy0upX/sQyCdAnOAbh3q7hwepBo/MHAp7r vVngrhKRHGHOchTLtsUO4E3aPyA65WwDxUn12gTXMjvRXGoYTdVVeGcVtRZQ6PTbaCF07lYiD6rF3 snAAS3PYbLklzaIT5dsA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1lnOdo-009tq6-Rq; Sun, 30 May 2021 16:50:20 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1lnOdm-009tpB-Dx for linux-riscv@lists.infradead.org; Sun, 30 May 2021 16:50:19 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 3E32561205; Sun, 30 May 2021 16:50:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1622393418; bh=h/LBInXkQe0GJZ3kZE09CPKLl4b0IH8I2tgS72te2ac=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JAuuZoeVs4jTmxdGUOrcYjzwzvZ2r9C3y/+H1ktgb5hWNFC4K2bNPhLpJVB7cTmge uYk3KlAxWk5EGU3aCAh6u0up/cchUbQMlqi4uQ6dzC+gEkzqBS7494ofgJDXMh8Hsv +zlhlvbZ3uSr0jtUaMy1Fj/HVxiUbIdGiibE3DrOPwqH2QpJb13X3uPGAI21I6ZUhe QEU8qRpKB8VkobaDR28nFjsQbJ6OPBCnt4yS+cOAmPlxFy6aghfuX/zuHbSbgr+Aiv 1xZIOcc7moaPsBte0MbYS78hCp91642uneZiJvtXYPFT045sN4cRlZDQRmX+z244OO eTvB/598AJl6A== From: guoren@kernel.org To: guoren@kernel.org, anup.patel@wdc.com, palmerdabbelt@google.com, arnd@arndb.de, hch@lst.de Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, Guo Ren Subject: [PATCH V5 2/3] riscv: Add ASID-based tlbflushing methods Date: Sun, 30 May 2021 16:49:25 +0000 Message-Id: <1622393366-46079-3-git-send-email-guoren@kernel.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1622393366-46079-1-git-send-email-guoren@kernel.org> References: <1622393366-46079-1-git-send-email-guoren@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210530_095018_542385_C446C368 X-CRM114-Status: GOOD ( 14.69 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org From: Guo Ren Implement optimized version of the tlb flushing routines for systems using ASIDs. These are behind the use_asid_allocator static branch to not affect existing systems not using ASIDs. Signed-off-by: Guo Ren Reviewed-by: Anup Patel Cc: Palmer Dabbelt Cc: Christoph Hellwig --- arch/riscv/include/asm/mmu_context.h | 2 ++ arch/riscv/include/asm/tlbflush.h | 22 +++++++++++++++++ arch/riscv/mm/context.c | 2 +- arch/riscv/mm/tlbflush.c | 46 +++++++++++++++++++++++++++++++++--- 4 files changed, 68 insertions(+), 4 deletions(-) diff --git a/arch/riscv/include/asm/mmu_context.h b/arch/riscv/include/asm/mmu_context.h index b065941..7030837 100644 --- a/arch/riscv/include/asm/mmu_context.h +++ b/arch/riscv/include/asm/mmu_context.h @@ -33,6 +33,8 @@ static inline int init_new_context(struct task_struct *tsk, return 0; } +DECLARE_STATIC_KEY_FALSE(use_asid_allocator); + #include #endif /* _ASM_RISCV_MMU_CONTEXT_H */ diff --git a/arch/riscv/include/asm/tlbflush.h b/arch/riscv/include/asm/tlbflush.h index c84218a..894cf75 100644 --- a/arch/riscv/include/asm/tlbflush.h +++ b/arch/riscv/include/asm/tlbflush.h @@ -22,9 +22,31 @@ static inline void local_flush_tlb_page(unsigned long addr) { ALT_FLUSH_TLB_PAGE(__asm__ __volatile__ ("sfence.vma %0" : : "r" (addr) : "memory")); } + +static inline void local_flush_tlb_all_asid(unsigned long asid) +{ + __asm__ __volatile__ ("sfence.vma x0, %0" + : + : "r" (asid) + : "memory"); +} + +static inline void local_flush_tlb_range_asid(unsigned long start, + unsigned long size, unsigned long asid) +{ + unsigned long tmp, end = ALIGN(start + size, PAGE_SIZE); + + for (tmp = start & PAGE_MASK; tmp < end; tmp += PAGE_SIZE) { + __asm__ __volatile__ ("sfence.vma %0, %1" + : + : "r" (tmp), "r" (asid) + : "memory"); + } +} #else /* CONFIG_MMU */ #define local_flush_tlb_all() do { } while (0) #define local_flush_tlb_page(addr) do { } while (0) +#define local_flush_tlb_range_asid(addr) do { } while (0) #endif /* CONFIG_MMU */ #if defined(CONFIG_SMP) && defined(CONFIG_MMU) diff --git a/arch/riscv/mm/context.c b/arch/riscv/mm/context.c index 68aa312..45c1b04 100644 --- a/arch/riscv/mm/context.c +++ b/arch/riscv/mm/context.c @@ -18,7 +18,7 @@ #ifdef CONFIG_MMU -static DEFINE_STATIC_KEY_FALSE(use_asid_allocator); +DEFINE_STATIC_KEY_FALSE(use_asid_allocator); static unsigned long asid_bits; static unsigned long num_asids; diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c index 720b443..87b4e52 100644 --- a/arch/riscv/mm/tlbflush.c +++ b/arch/riscv/mm/tlbflush.c @@ -4,6 +4,7 @@ #include #include #include +#include void flush_tlb_all(void) { @@ -39,18 +40,57 @@ static void __sbi_tlb_flush_range(struct cpumask *cmask, unsigned long start, put_cpu(); } +static void __sbi_tlb_flush_range_asid(struct cpumask *cmask, + unsigned long start, + unsigned long size, + unsigned long asid) +{ + struct cpumask hmask; + unsigned int cpuid; + + if (cpumask_empty(cmask)) + return; + + cpuid = get_cpu(); + + if (cpumask_any_but(cmask, cpuid) >= nr_cpu_ids) { + if (size == -1) + local_flush_tlb_all_asid(asid); + else + local_flush_tlb_range_asid(start, size, asid); + } else { + riscv_cpuid_to_hartid_mask(cmask, &hmask); + sbi_remote_sfence_vma_asid(cpumask_bits(&hmask), + start, size, asid); + } + + put_cpu(); +} + void flush_tlb_mm(struct mm_struct *mm) { - __sbi_tlb_flush_range(mm_cpumask(mm), 0, -1); + if (static_branch_unlikely(&use_asid_allocator)) + __sbi_tlb_flush_range_asid(mm_cpumask(mm), 0, -1, + atomic_long_read(&mm->context.id)); + else + __sbi_tlb_flush_range(mm_cpumask(mm), 0, -1); } void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr) { - __sbi_tlb_flush_range(mm_cpumask(vma->vm_mm), addr, PAGE_SIZE); + if (static_branch_unlikely(&use_asid_allocator)) + __sbi_tlb_flush_range_asid(mm_cpumask(vma->vm_mm), addr, PAGE_SIZE, + atomic_long_read(&vma->vm_mm->context.id)); + else + __sbi_tlb_flush_range(mm_cpumask(vma->vm_mm), addr, PAGE_SIZE); } void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) { - __sbi_tlb_flush_range(mm_cpumask(vma->vm_mm), start, end - start); + if (static_branch_unlikely(&use_asid_allocator)) + __sbi_tlb_flush_range_asid(mm_cpumask(vma->vm_mm), start, end - start, + atomic_long_read(&vma->vm_mm->context.id)); + else + __sbi_tlb_flush_range(mm_cpumask(vma->vm_mm), start, end - start); }