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Fri, 25 Sep 2020 11:31:24 +0000 From: Anup Patel To: Palmer Dabbelt , Palmer Dabbelt , Paul Walmsley , Albert Ou Subject: [RFC PATCH] RISC-V: Use SBI SRST extension when available Date: Fri, 25 Sep 2020 17:00:57 +0530 Message-Id: <20200925113057.725911-1-anup.patel@wdc.com> X-Mailer: git-send-email 2.25.1 X-ClientProxiedBy: MA1PR0101CA0063.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a00:20::25) To DM6PR04MB6201.namprd04.prod.outlook.com (2603:10b6:5:127::32) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from wdc.com (122.179.69.106) by MA1PR0101CA0063.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a00:20::25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3412.20 via Frontend Transport; Fri, 25 Sep 2020 11:31:20 +0000 X-Mailer: git-send-email 2.25.1 X-Originating-IP: [122.179.69.106] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: de43d0f2-8251-4b81-9026-08d861468894 X-MS-TrafficTypeDiagnostic: DM6PR04MB6778: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: WDCIPOUTBOUND: EOP-TRUE X-MS-Oob-TLC-OOBClassifiers: OLM:3513; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" 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 draft specification of SBI SRST extension is available in srbt_v1 branch of: https://github.com/avpatel/riscv-sbi-doc. This patch extends Linux RISC-V SBI implementation to detect and use SBI SRST extension. Signed-off-by: Anup Patel --- arch/riscv/include/asm/sbi.h | 7 +++++++ arch/riscv/kernel/sbi.c | 25 +++++++++++++++++++++++++ 2 files changed, 32 insertions(+) diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h index 653edb25d495..2fcecec7dd0c 100644 --- 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 +71,12 @@ enum sbi_hsm_hart_status { SBI_HSM_HART_STATUS_STOP_PENDING, }; +enum sbi_ext_srst_fid { + SBI_EXT_SRST_SHUTDOWN = 0, + SBI_EXT_SRST_COLD_REBOOT, + SBI_EXT_SRST_WARM_REBOOT +}; + #define SBI_SPEC_VERSION_DEFAULT 0x1 #define SBI_SPEC_VERSION_MAJOR_SHIFT 24 #define SBI_SPEC_VERSION_MAJOR_MASK 0x7f diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c index 226ccce0f9e0..865e028a9a4b 100644 --- a/arch/riscv/kernel/sbi.c +++ b/arch/riscv/kernel/sbi.c @@ -7,6 +7,7 @@ #include #include +#include #include #include @@ -501,6 +502,23 @@ int sbi_remote_hfence_vvma_asid(const unsigned long *hart_mask, } EXPORT_SYMBOL(sbi_remote_hfence_vvma_asid); +static int sbi_srst_reboot(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + sbi_ecall(SBI_EXT_SRST, (mode == REBOOT_WARM || mode == REBOOT_SOFT) ? + SBI_EXT_SRST_WARM_REBOOT : SBI_EXT_SRST_COLD_REBOOT, + 0, 0, 0, 0, 0, 0); + + return NOTIFY_DONE; +} + +static struct notifier_block sbi_srst_reboot_nb; + +static void sbi_srst_power_off(void) +{ + sbi_ecall(SBI_EXT_SRST, SBI_EXT_SRST_SHUTDOWN, 0, 0, 0, 0, 0, 0); +} + /** * sbi_probe_extension() - Check if an SBI extension ID is supported or not. * @extid: The extension ID to be probed. @@ -593,6 +611,13 @@ int __init sbi_init(void) } else { __sbi_rfence = __sbi_rfence_v01; } + if (sbi_probe_extension(SBI_EXT_SRST) > 0) { + pr_info("SBI v0.2 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; -- 2.25.1 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv