diff options
Diffstat (limited to 'target/linux/sifiveu/patches-5.15/0006-riscv-sbi-srst-support.patch')
-rw-r--r-- | target/linux/sifiveu/patches-5.15/0006-riscv-sbi-srst-support.patch | 301 |
1 files changed, 301 insertions, 0 deletions
diff --git a/target/linux/sifiveu/patches-5.15/0006-riscv-sbi-srst-support.patch b/target/linux/sifiveu/patches-5.15/0006-riscv-sbi-srst-support.patch new file mode 100644 index 0000000000..409001bcfa --- /dev/null +++ b/target/linux/sifiveu/patches-5.15/0006-riscv-sbi-srst-support.patch @@ -0,0 +1,301 @@ +From mboxrd@z Thu Jan 1 00:00:00 1970 +Return-Path: <SRS0=S+R5=LD=lists.infradead.org=linux-riscv-bounces+linux-riscv=archiver.kernel.org@kernel.org> +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=-21.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, + DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, + INCLUDES_PATCH,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,MSGID_FROM_MTA_HEADER, + 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 9A34CC48BCD + for <linux-riscv@archiver.kernel.org>; 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Wed, 9 Jun 2021 + 12:13:47 +0000 +From: Anup Patel <anup.patel@wdc.com> +To: Palmer Dabbelt <palmer@dabbelt.com>, + Palmer Dabbelt <palmerdabbelt@google.com>, + Paul Walmsley <paul.walmsley@sifive.com>, Albert Ou <aou@eecs.berkeley.edu> +Cc: Atish Patra <atish.patra@wdc.com>, + Alistair Francis <Alistair.Francis@wdc.com>, + Anup Patel <anup@brainfault.org>, linux-riscv@lists.infradead.org, + linux-kernel@vger.kernel.org, Anup Patel <anup.patel@wdc.com> +Subject: [PATCH v7 1/1] RISC-V: Use SBI SRST extension when available +Date: Wed, 9 Jun 2021 17:43:22 +0530 +Message-Id: <20210609121322.3058-2-anup.patel@wdc.com> +X-Mailer: git-send-email 2.25.1 +In-Reply-To: <20210609121322.3058-1-anup.patel@wdc.com> +References: <20210609121322.3058-1-anup.patel@wdc.com> +X-Originating-IP: [122.172.176.125] +X-ClientProxiedBy: MA1PR0101CA0036.INDPRD01.PROD.OUTLOOK.COM + (2603:1096:a00:22::22) To CO6PR04MB7812.namprd04.prod.outlook.com + (2603:10b6:303:138::6) +MIME-Version: 1.0 +X-MS-Exchange-MessageSentRepresentingType: 1 +Received: from wdc.com (122.172.176.125) by + MA1PR0101CA0036.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a00:22::22) with + Microsoft SMTP Server (version=TLS1_2, + cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4219.21 via Frontend + Transport; 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charset="us-ascii" +Content-Transfer-Encoding: 7bit +Sender: "linux-riscv" <linux-riscv-bounces@lists.infradead.org> +Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org + +The SBI SRST extension provides a standard way to poweroff and +reboot the system irrespective to whether Linux RISC-V S-mode +is running natively (HS-mode) or inside Guest/VM (VS-mode). + +The SBI SRST extension is available in the SBI v0.3 specification. +(Refer, https://github.com/riscv/riscv-sbi-doc/releases/tag/v0.3.0-rc1) + +This patch extends Linux RISC-V SBI implementation to detect +and use SBI SRST extension. + +Signed-off-by: Anup Patel <anup.patel@wdc.com> +Reviewed-by: Atish Patra <atish.patra@wdc.com> +--- + arch/riscv/include/asm/sbi.h | 24 ++++++++++++++++++++++++ + arch/riscv/kernel/sbi.c | 35 +++++++++++++++++++++++++++++++++++ + 2 files changed, 59 insertions(+) + +--- a/arch/riscv/include/asm/sbi.h ++++ b/arch/riscv/include/asm/sbi.h +@@ -27,6 +27,7 @@ enum sbi_ext_id { + SBI_EXT_IPI = 0x735049, + SBI_EXT_RFENCE = 0x52464E43, + SBI_EXT_HSM = 0x48534D, ++ SBI_EXT_SRST = 0x53525354, + }; + + enum sbi_ext_base_fid { +@@ -70,6 +71,21 @@ enum sbi_hsm_hart_status { + SBI_HSM_HART_STATUS_STOP_PENDING, + }; + ++enum sbi_ext_srst_fid { ++ SBI_EXT_SRST_RESET = 0, ++}; ++ ++enum sbi_srst_reset_type { ++ SBI_SRST_RESET_TYPE_SHUTDOWN = 0, ++ SBI_SRST_RESET_TYPE_COLD_REBOOT, ++ SBI_SRST_RESET_TYPE_WARM_REBOOT, ++}; ++ ++enum sbi_srst_reset_reason { ++ SBI_SRST_RESET_REASON_NONE = 0, ++ SBI_SRST_RESET_REASON_SYS_FAILURE, ++}; ++ + #define SBI_SPEC_VERSION_DEFAULT 0x1 + #define SBI_SPEC_VERSION_MAJOR_SHIFT 24 + #define SBI_SPEC_VERSION_MAJOR_MASK 0x7f +@@ -148,6 +164,14 @@ static inline unsigned long sbi_minor_ve + return sbi_spec_version & SBI_SPEC_VERSION_MINOR_MASK; + } + ++/* Make SBI version */ ++static inline unsigned long sbi_mk_version(unsigned long major, ++ unsigned long minor) ++{ ++ return ((major & SBI_SPEC_VERSION_MAJOR_MASK) << ++ SBI_SPEC_VERSION_MAJOR_SHIFT) | minor; ++} ++ + int sbi_err_map_linux_errno(int err); + #else /* CONFIG_RISCV_SBI */ + static inline int sbi_remote_fence_i(const unsigned long *hart_mask) { return -1; } +--- a/arch/riscv/kernel/sbi.c ++++ b/arch/riscv/kernel/sbi.c +@@ -7,6 +7,7 @@ + + #include <linux/init.h> + #include <linux/pm.h> ++#include <linux/reboot.h> + #include <asm/sbi.h> + #include <asm/smp.h> + +@@ -501,6 +502,32 @@ int sbi_remote_hfence_vvma_asid(const un + } + EXPORT_SYMBOL(sbi_remote_hfence_vvma_asid); + ++static void sbi_srst_reset(unsigned long type, unsigned long reason) ++{ ++ sbi_ecall(SBI_EXT_SRST, SBI_EXT_SRST_RESET, type, reason, ++ 0, 0, 0, 0); ++ pr_warn("%s: type=0x%lx reason=0x%lx failed\n", ++ __func__, type, reason); ++} ++ ++static int sbi_srst_reboot(struct notifier_block *this, ++ unsigned long mode, void *cmd) ++{ ++ sbi_srst_reset((mode == REBOOT_WARM || mode == REBOOT_SOFT) ? ++ SBI_SRST_RESET_TYPE_WARM_REBOOT : ++ SBI_SRST_RESET_TYPE_COLD_REBOOT, ++ SBI_SRST_RESET_REASON_NONE); ++ return NOTIFY_DONE; ++} ++ ++static struct notifier_block sbi_srst_reboot_nb; ++ ++static void sbi_srst_power_off(void) ++{ ++ sbi_srst_reset(SBI_SRST_RESET_TYPE_SHUTDOWN, ++ SBI_SRST_RESET_REASON_NONE); ++} ++ + /** + * sbi_probe_extension() - Check if an SBI extension ID is supported or not. + * @extid: The extension ID to be probed. +@@ -608,6 +635,14 @@ void __init sbi_init(void) + } else { + __sbi_rfence = __sbi_rfence_v01; + } ++ if ((sbi_spec_version >= sbi_mk_version(0, 3)) && ++ (sbi_probe_extension(SBI_EXT_SRST) > 0)) { ++ pr_info("SBI SRST extension detected\n"); ++ pm_power_off = sbi_srst_power_off; ++ sbi_srst_reboot_nb.notifier_call = sbi_srst_reboot; ++ sbi_srst_reboot_nb.priority = 192; ++ register_restart_handler(&sbi_srst_reboot_nb); ++ } + } else { + __sbi_set_timer = __sbi_set_timer_v01; + __sbi_send_ipi = __sbi_send_ipi_v01; |