From patchwork Tue Jan 3 21:03:55 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Conor Dooley X-Patchwork-Id: 13088033 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 smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 B0BEFC3DA7D for ; Tue, 3 Jan 2023 21:04:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) id 97AD4C433F0; Tue, 3 Jan 2023 21:04:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4F9F7C4339B; Tue, 3 Jan 2023 21:04:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1672779874; bh=Dprtt2wF+NQ6SFZu7LTN8Uj8OXvpK3xyWL0QoGrvAoA=; h=From:To:List-Id:Cc:Subject:Date:In-Reply-To:References:From; b=oFgdGWiLzkHWlvMjV80WzM61DUgIBEyOssLRzqjVpdgrVPratzuquppyS3iPHjiTj L1v/1cNQg8ioGIEEhtQrs+UyTDl7iHjmZax/+N0RD397I5kTsUssLJESJJX/RAqgJr ITtf4JHnfnMkJPyQzO5Qmq0Z5f8882pf7hA81Hrep1Db2TvAskKh6YEWpMP61XqUBC 2HnUS+gGNNkZkbL5nT3C4q7OaPSS6qTEIiytUu37kXkeKPP4bKc351Aq+uVb4ts4Gq /sGZh5ub00hYneBh50DUoTK2Awh92M40bhthQnPSjAnGUg8hRGUMqsEqMi91aoaw+b qZ3AIVa/W31fA== From: Conor Dooley To: conor@kernel.org, arnd@arndb.de, palmer@dabbelt.com, prabhakar.csengg@gmail.com List-Id: Cc: Conor Dooley , ajones@ventanamicro.com, aou@eecs.berkeley.edu, apatel@ventanamicro.com, atishp@rivosinc.com, biju.das.jz@bp.renesas.com, devicetree@vger.kernel.org, geert@linux-m68k.org, guoren@kernel.org, hch@infradead.org, heiko@sntech.de, jszhang@kernel.org, krzysztof.kozlowski+dt@linaro.org, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-riscv@lists.infradead.org, magnus.damm@gmail.com, nathan@kernel.org, paul.walmsley@sifive.com, philipp.tomsich@vrull.eu, prabhakar.mahadev-lad.rj@bp.renesas.com, robh+dt@kernel.org, samuel@sholland.org, soc@kernel.org Subject: [RFC v5.1 3/9] riscv: errata: Add Andes alternative ports Date: Tue, 3 Jan 2023 21:03:55 +0000 Message-Id: <20230103210400.3500626-4-conor@kernel.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: References: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=7075; i=conor.dooley@microchip.com; h=from:subject; bh=00UtI+q6z/vXb7iVXyA4KCXaUC3/5LYAlPRoaCVv1lk=; b=owGbwMvMwCFWscWwfUFT0iXG02pJDMlbZljo5gX2i5jl/jPZcS35vcjC0xHtLQHlesdMuk+t/Oj9 V0+oo5SFQYyDQVZMkSXxdl+L1Po/Ljuce97CzGFlAhnCwMUpABO5eonhf25+BPuXvd+Of5katHr9zq pgToWa6Ydq4pa9FrPaNFF/fgvD/9KjDvtOJJSnznni2Hrud4/U31VNZc91tlr3LulZa9HWxwAA X-Developer-Key: i=conor.dooley@microchip.com; a=openpgp; fpr=F9ECA03CF54F12CD01F1655722E2C55B37CF380C From: Lad Prabhakar Add required ports of the Alternative scheme for Andes CPU cores. I/O Coherence Port (IOCP) provides an AXI interface for connecting external non-caching masters, such as DMA controllers. IOCP is a specification option and is disabled on the Renesas RZ/Five SoC due to this reason cache management needs a software workaround. Signed-off-by: Lad Prabhakar Signed-off-by: Conor Dooley --- arch/riscv/Kconfig.erratas | 22 +++++++ arch/riscv/errata/Makefile | 1 + arch/riscv/errata/andes/Makefile | 1 + arch/riscv/errata/andes/errata.c | 93 ++++++++++++++++++++++++++++ arch/riscv/include/asm/alternative.h | 3 + arch/riscv/include/asm/errata_list.h | 5 ++ arch/riscv/kernel/alternative.c | 5 ++ 7 files changed, 130 insertions(+) create mode 100644 arch/riscv/errata/andes/Makefile create mode 100644 arch/riscv/errata/andes/errata.c diff --git a/arch/riscv/Kconfig.erratas b/arch/riscv/Kconfig.erratas index 69621ae6d647..f0f0c1abd52b 100644 --- a/arch/riscv/Kconfig.erratas +++ b/arch/riscv/Kconfig.erratas @@ -1,5 +1,27 @@ menu "CPU errata selection" +config ERRATA_ANDES + bool "Andes AX45MP errata" + depends on !XIP_KERNEL + select RISCV_ALTERNATIVE + help + All Andes errata Kconfig depend on this Kconfig. Disabling + this Kconfig will disable all Andes errata. Please say "Y" + here if your platform uses Andes CPU cores. + + Otherwise, please say "N" here to avoid unnecessary overhead. + +config ERRATA_ANDES_CMO + bool "Apply Andes cache management errata" + depends on ERRATA_ANDES && MMU && ARCH_R9A07G043 + select RISCV_DMA_NONCOHERENT + default y + help + This will apply the cache management errata to handle the + non-standard handling on non-coherent operations on Andes cores. + + If you don't know what to do here, say "Y". + config ERRATA_SIFIVE bool "SiFive errata" depends on !XIP_KERNEL diff --git a/arch/riscv/errata/Makefile b/arch/riscv/errata/Makefile index a1055965fbee..6f1c693af92d 100644 --- a/arch/riscv/errata/Makefile +++ b/arch/riscv/errata/Makefile @@ -1,2 +1,3 @@ +obj-$(CONFIG_ERRATA_ANDES) += andes/ obj-$(CONFIG_ERRATA_SIFIVE) += sifive/ obj-$(CONFIG_ERRATA_THEAD) += thead/ diff --git a/arch/riscv/errata/andes/Makefile b/arch/riscv/errata/andes/Makefile new file mode 100644 index 000000000000..2d644e19caef --- /dev/null +++ b/arch/riscv/errata/andes/Makefile @@ -0,0 +1 @@ +obj-y += errata.o diff --git a/arch/riscv/errata/andes/errata.c b/arch/riscv/errata/andes/errata.c new file mode 100644 index 000000000000..3d04f15df8d5 --- /dev/null +++ b/arch/riscv/errata/andes/errata.c @@ -0,0 +1,93 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Erratas to be applied for Andes CPU cores + * + * Copyright (C) 2022 Renesas Electronics Corporation. + * + * Author: Lad Prabhakar + */ + +#include +#include + +#include +#include +#include +#include +#include +#include + +#define ANDESTECH_AX45MP_MARCHID 0x8000000000008a45UL +#define ANDESTECH_AX45MP_MIMPID 0x500UL +#define ANDESTECH_SBI_EXT_ANDES 0x0900031E + +#define RZFIVE_SBI_EXT_IOCP_SW_WORKAROUND 0 + +static long ax45mp_iocp_sw_workaround(void) +{ + struct sbiret ret; + + ret = sbi_ecall(ANDESTECH_SBI_EXT_ANDES, RZFIVE_SBI_EXT_IOCP_SW_WORKAROUND, + 0, 0, 0, 0, 0, 0); + + return ret.error ? 0 : ret.value; +} + +static bool errata_probe_iocp(unsigned int stage, unsigned long arch_id, unsigned long impid) +{ + if (!IS_ENABLED(CONFIG_ERRATA_ANDES_CMO)) + return false; + + if (arch_id != ANDESTECH_AX45MP_MARCHID || impid != ANDESTECH_AX45MP_MIMPID) + return false; + + if (!ax45mp_iocp_sw_workaround()) + return false; + + /* Set this just to make core cbo code happy */ + riscv_cbom_block_size = 1; + riscv_noncoherent_supported(); + + return true; +} + +static u32 andes_errata_probe(unsigned int stage, unsigned long archid, unsigned long impid) +{ + u32 cpu_req_errata = 0; + + /* + * In the absence of the I/O Coherency Port, access to certain peripherals + * requires vendor specific DMA handling. + */ + if (errata_probe_iocp(stage, archid, impid)) + cpu_req_errata |= BIT(ERRATA_ANDESTECH_NO_IOCP); + + return cpu_req_errata; +} + +void __init_or_module andes_errata_patch_func(struct alt_entry *begin, struct alt_entry *end, + unsigned long archid, unsigned long impid, + unsigned int stage) +{ + u32 cpu_req_errata = andes_errata_probe(stage, archid, impid); + struct alt_entry *alt; + u32 tmp; + + if (stage == RISCV_ALTERNATIVES_EARLY_BOOT) + return; + + for (alt = begin; alt < end; alt++) { + if (alt->vendor_id != ANDESTECH_VENDOR_ID) + continue; + if (alt->errata_id >= ERRATA_ANDESTECH_NUMBER) + continue; + + tmp = BIT(alt->errata_id); + if (cpu_req_errata & tmp) { + patch_text_nosync(alt->old_ptr, alt->alt_ptr, alt->alt_len); + + riscv_alternative_fix_offsets(alt->old_ptr, alt->alt_len, + alt->old_ptr - alt->alt_ptr); + } + } +} diff --git a/arch/riscv/include/asm/alternative.h b/arch/riscv/include/asm/alternative.h index 1bd4027d34ca..e3a8e603eb5a 100644 --- a/arch/riscv/include/asm/alternative.h +++ b/arch/riscv/include/asm/alternative.h @@ -43,6 +43,9 @@ struct errata_checkfunc_id { bool (*func)(struct alt_entry *alt); }; +void andes_errata_patch_func(struct alt_entry *begin, struct alt_entry *end, + unsigned long archid, unsigned long impid, + unsigned int stage); void sifive_errata_patch_func(struct alt_entry *begin, struct alt_entry *end, unsigned long archid, unsigned long impid, unsigned int stage); diff --git a/arch/riscv/include/asm/errata_list.h b/arch/riscv/include/asm/errata_list.h index 4180312d2a70..2ba7e6e74540 100644 --- a/arch/riscv/include/asm/errata_list.h +++ b/arch/riscv/include/asm/errata_list.h @@ -9,6 +9,11 @@ #include #include +#ifdef CONFIG_ERRATA_ANDES +#define ERRATA_ANDESTECH_NO_IOCP 0 +#define ERRATA_ANDESTECH_NUMBER 1 +#endif + #ifdef CONFIG_ERRATA_SIFIVE #define ERRATA_SIFIVE_CIP_453 0 #define ERRATA_SIFIVE_CIP_1200 1 diff --git a/arch/riscv/kernel/alternative.c b/arch/riscv/kernel/alternative.c index 6212ea0eed72..d7027a977ee6 100644 --- a/arch/riscv/kernel/alternative.c +++ b/arch/riscv/kernel/alternative.c @@ -40,6 +40,11 @@ static void __init_or_module riscv_fill_cpu_mfr_info(struct cpu_manufacturer_inf #endif switch (cpu_mfr_info->vendor_id) { +#ifdef CONFIG_ERRATA_ANDES + case ANDESTECH_VENDOR_ID: + cpu_mfr_info->patch_func = andes_errata_patch_func; + break; +#endif #ifdef CONFIG_ERRATA_SIFIVE case SIFIVE_VENDOR_ID: cpu_mfr_info->patch_func = sifive_errata_patch_func;