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[2620:137:e000::1:20]) by mx.google.com with ESMTP id a1-20020a170906244100b008dd84b08a23si392403ejb.272.2023.02.28.13.59.10; Tue, 28 Feb 2023 13:59:33 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=sntech.de Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229896AbjB1VzF (ORCPT + 99 others); Tue, 28 Feb 2023 16:55:05 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45894 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229437AbjB1VzD (ORCPT ); Tue, 28 Feb 2023 16:55:03 -0500 Received: from gloria.sntech.de (gloria.sntech.de [185.11.138.130]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DF5F532E61 for ; Tue, 28 Feb 2023 13:54:54 -0800 (PST) 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 1pX7vm-0005hs-FY; Tue, 28 Feb 2023 22:54:42 +0100 From: Heiko Stuebner To: palmer@dabbelt.com Cc: linux-riscv@lists.infradead.org, samuel@sholland.org, guoren@kernel.org, christoph.muellner@vrull.eu, heiko@sntech.de, conor.dooley@microchip.com, linux-kernel@vger.kernel.org, Heiko Stuebner Subject: [PATCH RFC 0/2] RISC-V: T-Head vector handling Date: Tue, 28 Feb 2023 22:54:33 +0100 Message-Id: <20230228215435.3366914-1-heiko@sntech.de> X-Mailer: git-send-email 2.39.0 MIME-Version: 1.0 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,SPF_PASS, T_SPF_HELO_TEMPERROR autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1759113719018892435?= X-GMAIL-MSGID: =?utf-8?q?1759113719018892435?= From: Heiko Stuebner As is widely known the T-Head C9xx cores used for example in the Allwinner D1 implement an older non-ratified variant of the vector spec. While userspace will probably have a lot more problems implementing support for both, on the kernel side the needed changes are actually somewhat small'ish and can be handled via alternatives somewhat nicely. With this patchset I could run the same userspace program (picked from some riscv-vector-test repository) that does some vector additions on both qemu and a d1-nezha board. On both platforms it ran sucessfully and even produced the same results. As can be seen in the todo list, there are 2 places where the changed SR_VS location still needs to be handled in the next revision (assembly + ALTERNATIVES + constants + probably stringify resulted in some grey hair so far already) ToDo: - follow along with the base vector patchset - handle SR_VS access in _save_context and _secondary_start_sbi Heiko Stuebner (2): RISC-V: define the elements of the VCSR vector CSR RISC-V: add T-Head vector errata handling arch/riscv/Kconfig.erratas | 13 +++ arch/riscv/errata/thead/errata.c | 32 ++++++ arch/riscv/include/asm/csr.h | 31 +++++- arch/riscv/include/asm/errata_list.h | 62 +++++++++++- arch/riscv/include/asm/vector.h | 139 +++++++++++++++++++++++++-- 5 files changed, 261 insertions(+), 16 deletions(-)