From patchwork Sun Jun 19 20:32:08 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Heiko Stuebner X-Patchwork-Id: 12886821 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 22FE8C43334 for ; Sun, 19 Jun 2022 20:32:48 +0000 (UTC) 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:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version: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:In-Reply-To:References: List-Owner; bh=r1qfV4LVuJUVwXpsrSLV8jg9T3pD2lDduCHaahIpOig=; b=g5emZuyQE4/uvy ynZw0BRORpoxcQzuRTMxeRfA4CCH8226IOEOftLW8msndvgX2CAy6MkoXQwlhXHOUpkV4iEZxE6UF XIKxZrJNuafukFvdiPOWBYuchCm9hbHIl+GAmlxAPVbt4zWrtOSH9UYlq8MzO3z2zZAgYosxLKq1d 90qcnQ7fFP/OV+Z/AKr0PfQFIqTRVoIu1WMH/hOzL/sjQCVuBTh6mXPkvfiCP+trNjh/JhRIheIDX wC6isgX17QbF0hZkUWqkfzlLHgJdIb9vuxjtImiDkm3W7fkl9kDEuHLCX+2UsTrbaag+0pnFDLUCP iIFkqMAgSRiF+pYPINCg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1o31ay-00F7wr-0x; Sun, 19 Jun 2022 20:32:32 +0000 Received: from gloria.sntech.de ([185.11.138.130]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1o31at-00F7tv-Ko for linux-riscv@lists.infradead.org; Sun, 19 Jun 2022 20:32:29 +0000 Received: from ip5b412258.dynamic.kabel-deutschland.de ([91.65.34.88] helo=phil.lan) by gloria.sntech.de with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1o31am-0000EW-MI; Sun, 19 Jun 2022 22:32:20 +0200 From: Heiko Stuebner To: palmer@dabbelt.com, paul.walmsley@sifive.com Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, wefu@redhat.com, guoren@kernel.org, cmuellner@linux.com, philipp.tomsich@vrull.eu, hch@lst.de, samuel@sholland.org, atishp@atishpatra.org, anup@brainfault.org, mick@ics.forth.gr, robh+dt@kernel.org, krzk+dt@kernel.org, devicetree@vger.kernel.org, drew@beagleboard.org, rdunlap@infradead.org, Heiko Stuebner Subject: [PATCH v4 0/4] riscv: implement Zicbom-based CMO instructions + the t-head variant Date: Sun, 19 Jun 2022 22:32:08 +0200 Message-Id: <20220619203212.3604485-1-heiko@sntech.de> X-Mailer: git-send-email 2.35.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220619_133227_751639_13FD275C X-CRM114-Status: GOOD ( 17.70 ) 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: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org This series is based on the alternatives changes done in my svpbmt series and thus also depends on Atish's isa-extension parsing series. It implements using the cache-management instructions from the Zicbom- extension to handle cache flush, etc actions on platforms needing them. SoCs using cpu cores from T-Head like the Allwinne D1 implement a different set of cache instructions. But while they are different, instructions they provide the same functionality, so a variant can easly hook into the existing alternatives mechanism on those. An ongoing discussion is about the currently used pre-coded instructions. Palmer's current thinking is that we should wait until the relevant instructions have landed in binutils. The main Zicbom instructions are in toolchains now and at least Debian also carries a binutils snapshot with it, but the T-Head variant still uses pre-coded instructions for now. The series sits on top of my svpbmt fixup series, which for example includes the conversion away from function pointers for the check-functions. And also uses my nops-series. Hopefully I caught all the review-comments from v3. changes in v4: - modify of_dma_is_coherent() also handle coherent system with maybe noncoherent devices - move Zicbom to use real instructions - split off the actual dma-noncoherent code from the Zicbom extension - Don't assumes devices are non-coherent, instead default to coherent and require the non-coherent ones to be marked - CPUFEATURE_ZICBOM instead of CPUFEATURE_CMO - fix used cache addresses - drop some unused headers from dma-noncoherent.c - move unsigned long cast when calling ALT_CMO_OP - remove unneeded memset-0 - define ARCH_DMA_MINALIGN - use flush instead of inval in arch_sync_dma_for_cpu() - depend on !XIP_KERNEL - trim some line lengths - improve Kconfig description changes in v3: - rebase onto 5.19-rc1 + svpbmt-fixup-series - adapt wording for block-size binding - include asm/cacheflush.h into dma-noncoherent to fix the no-prototype error clang seems to generate - use __nops macro for readability - add some received tags - add a0 to the clobber list changes in v2: - cbom-block-size is hardware-specific and comes from firmware - update Kconfig name to use the ISA extension name - select the ALTERNATIVES symbol when enabled - shorten the line lengths of the errata-assembly Heiko Stuebner (4): of: also handle dma-noncoherent in of_dma_is_coherent() dt-bindings: riscv: document cbom-block-size riscv: Implement Zicbom-based cache management operations riscv: implement cache-management errata for T-Head SoCs .../devicetree/bindings/riscv/cpus.yaml | 5 + arch/riscv/Kconfig | 31 ++++++ arch/riscv/Kconfig.erratas | 11 +++ arch/riscv/Makefile | 4 + arch/riscv/errata/thead/errata.c | 15 +++ arch/riscv/include/asm/cache.h | 4 + arch/riscv/include/asm/cacheflush.h | 6 ++ arch/riscv/include/asm/errata_list.h | 59 +++++++++++- arch/riscv/include/asm/hwcap.h | 1 + arch/riscv/kernel/cpu.c | 1 + arch/riscv/kernel/cpufeature.c | 18 ++++ arch/riscv/kernel/setup.c | 2 + arch/riscv/mm/Makefile | 1 + arch/riscv/mm/dma-noncoherent.c | 96 +++++++++++++++++++ drivers/of/address.c | 16 +++- 15 files changed, 263 insertions(+), 7 deletions(-) create mode 100644 arch/riscv/mm/dma-noncoherent.c