From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: 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=-9.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 D5A2EC43603 for ; Wed, 18 Dec 2019 21:39:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8DB64227BF for ; Wed, 18 Dec 2019 21:39:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=wdc.com header.i=@wdc.com header.b="jILLUdBm" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726769AbfLRVjo (ORCPT ); Wed, 18 Dec 2019 16:39:44 -0500 Received: from esa6.hgst.iphmx.com ([216.71.154.45]:31480 "EHLO esa6.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726712AbfLRVji (ORCPT ); Wed, 18 Dec 2019 16:39:38 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1576705178; x=1608241178; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=/SKTmCngGSbKcgoc6IIR2Cw0ASAwEr57JoEQ2MV5rw8=; b=jILLUdBm0x2NKQsJfjm7gyr/WX1GLWgnENjPKVzAUnKEf2msAQqQAOkl +KJFXTKrsfzN4dqpHA6MtWlZbTN/qV7CHoqfA86yxa6Ppvsy+X/Wkdk9K sA+A6jCyrRsW/ZvinYMoxwf0/S3onmzSzv3XU1sIwlzeVQEmohST17F8p Pu8nWb4HPRsKWSmXuGgZsPqia+0pVMa8Brh5P5524LWKuDFjZUd0thSvL a4HjVd1Ew+te1ia/yU6G7nyGELOXJyK88SX4H2v5/N1vNMbcKgiW/jj30 VXAz///9+HZoZl0RUwujO4sXCRyEdRWLqByffksv7EUYQc7lY8MCvgdUp w==; IronPort-SDR: Jjxx2OY1rIoqPM3O0hnBGlwltkgZWZFgdTKgCc/76oA26cpW9Umr+/1AbHbhQCruMGSv5DpVjT vIvzKP68GZHjJTz38A8JYqPmy5O21ZfTW64k9MjhtC4rp/8/vDOGKuZP3IPka/3JSRL3DKR1YZ WEeCUlFqfHEo/m6vKasgy9x34Ja4iAW6WKQp3rHmFxFpm9AQF41G8FW5q00LZDM7pigPuyY7ND xzIOnWCYhdwelcUFFhWrrEy510MJHXXRHKpNO1kXfFHJWS3beQa2k6XUI0qHCC5zXIQO9e+Qvs /b0= X-IronPort-AV: E=Sophos;i="5.69,330,1571673600"; d="scan'208";a="127281470" Received: from h199-255-45-15.hgst.com (HELO uls-op-cesaep02.wdc.com) ([199.255.45.15]) by ob1.hgst.iphmx.com with ESMTP; 19 Dec 2019 05:39:38 +0800 IronPort-SDR: 9NK9xFfMHPTTuMDsnklUR+Iny+LnUUYbgoiTei+6uDs37JFYWz7l8r6pTA2APW4RA5oiObLx2T BriLCXNuWDwqO5aGz4dP+XmfPxad25HKd4BmMlzgAJ4RPvE+ckcHC6Nb45oGzPA8PXsAZS3Qnw fnyUXaZvk7/vktlPz3dZ7J8UOG+lZFQ4Ws8GyLy92zbnLnbJmFkO/1LZ/MkSIwpjHJvvXYnfV+ WN3j59esqYvOtpOhXLB2DKnWL1MBWPUA5Gay4bHgi+NF1eYqSnoeE+2OAfxfzAMlGzAJXf7HnP UFQ5Ftx/g4Dn/mXlT6dK+Jay Received: from uls-op-cesaip02.wdc.com ([10.248.3.37]) by uls-op-cesaep02.wdc.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Dec 2019 13:33:39 -0800 IronPort-SDR: 8vxEFPBWp5UIiI7MsIla4TjGpdGHBc6RwIYyTF9jBFvy9uCQoPGyNBSF0f53vun2llDu25RZvB SfNJ4G6PfQ6nDITY4PLjp+lQPCcey+swpvgcmgwmQ0Coij4XERk2tdp1nE2ebfWSLA4JDmuM83 f0/cbPwJiO8wBfWEHRBXrA2AMpdxQvJlgoF0+RYn9i45Wu43lhVB/oVH+m/uIC8Dt5vwUaqpK5 0CF6v+AOWUGUs5qh7Z13hY+XbGCDtcyRW1Rt/PKBiT3yPeQ99Ol6ukt8UkUtVNvA0U7wXVGiGo 8pE= WDCIronportException: Internal Received: from jedi-01.sdcorp.global.sandisk.com (HELO jedi-01.int.fusionio.com) ([10.11.143.218]) by uls-op-cesaip02.wdc.com with ESMTP; 18 Dec 2019 13:39:38 -0800 From: Atish Patra To: linux-kernel@vger.kernel.org Cc: Atish Patra , Anup Patel , Albert Ou , linux-riscv@lists.infradead.org, Mike Rapoport , Palmer Dabbelt , Paul Walmsley , Thomas Gleixner , Atish Patra , Palmer Dabbelt Subject: [PATCH v6 4/5] RISC-V: Introduce a new config for SBI v0.1 Date: Wed, 18 Dec 2019 13:39:17 -0800 Message-Id: <20191218213918.16676-5-atish.patra@wdc.com> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191218213918.16676-1-atish.patra@wdc.com> References: <20191218213918.16676-1-atish.patra@wdc.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We now have SBI v0.2 which is more scalable and extendable to handle future needs for RISC-V supervisor interfaces. Introduce a new config and move all SBI v0.1 code under that config. This allows to implement the new replacement SBI extensions cleanly and remove v0.1 extensions easily in future. Currently, the config is enabled by default. Once all M-mode software, with v0.1, is no longer in use, this config option and all relevant code can be easily removed. Signed-off-by: Atish Patra Reviewed-by: Anup Patel --- arch/riscv/Kconfig | 6 ++ arch/riscv/include/asm/sbi.h | 2 + arch/riscv/kernel/sbi.c | 137 +++++++++++++++++++++++++++++------ 3 files changed, 121 insertions(+), 24 deletions(-) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 759ffb00267c..14b6726bef50 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -305,6 +305,12 @@ config SECCOMP and the task is only allowed to execute a few safe syscalls defined by each seccomp mode. +config RISCV_SBI_V01 + bool "SBI v0.1 support" + default y + help + This config allows kernel to use SBI v0.1 APIs. This will be + deprecated in future once legacy M-mode software are no longer in use. endmenu menu "Boot options" diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h index 9612133213ba..89a25a049d12 100644 --- a/arch/riscv/include/asm/sbi.h +++ b/arch/riscv/include/asm/sbi.h @@ -11,6 +11,7 @@ #ifdef CONFIG_RISCV_SBI enum sbi_ext_id { +#ifdef CONFIG_RISCV_SBI_V01 SBI_EXT_0_1_SET_TIMER = 0x0, SBI_EXT_0_1_CONSOLE_PUTCHAR = 0x1, SBI_EXT_0_1_CONSOLE_GETCHAR = 0x2, @@ -20,6 +21,7 @@ enum sbi_ext_id { SBI_EXT_0_1_REMOTE_SFENCE_VMA = 0x6, SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID = 0x7, SBI_EXT_0_1_SHUTDOWN = 0x8, +#endif SBI_EXT_BASE = 0x10, SBI_EXT_TIME = 0x54494D45, SBI_EXT_IPI = 0x735049, diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c index 33632e7f91da..265637cb5eb0 100644 --- a/arch/riscv/kernel/sbi.c +++ b/arch/riscv/kernel/sbi.c @@ -13,6 +13,13 @@ unsigned long sbi_spec_version = SBI_SPEC_VERSION_DEFAULT; EXPORT_SYMBOL(sbi_spec_version); +static void (*__sbi_set_timer)(uint64_t stime); +static int (*__sbi_send_ipi)(const unsigned long *hart_mask); +static int (*__sbi_rfence)(int fid, const unsigned long *hart_mask, + unsigned long hbase, unsigned long start, + unsigned long size, unsigned long arg4, + unsigned long arg5); + struct sbiret sbi_ecall(int ext, int fid, unsigned long arg0, unsigned long arg1, unsigned long arg2, unsigned long arg3, unsigned long arg4, @@ -57,6 +64,7 @@ static int sbi_err_map_linux_errno(int err) }; } +#ifdef CONFIG_RISCV_SBI_V01 /** * sbi_console_putchar() - Writes given character to the console device. * @ch: The data to be written to the console. @@ -85,41 +93,115 @@ int sbi_console_getchar(void) EXPORT_SYMBOL(sbi_console_getchar); /** - * sbi_set_timer() - Program the timer for next timer event. - * @stime_value: The value after which next timer event should fire. + * sbi_shutdown() - Remove all the harts from executing supervisor code. * * Return: None */ -void sbi_set_timer(uint64_t stime_value) +void sbi_shutdown(void) { -#if __riscv_xlen == 32 - sbi_ecall(SBI_EXT_0_1_SET_TIMER, 0, stime_value, - stime_value >> 32, 0, 0, 0, 0); -#else - sbi_ecall(SBI_EXT_0_1_SET_TIMER, 0, stime_value, 0, 0, 0, 0, 0); -#endif + sbi_ecall(SBI_EXT_0_1_SHUTDOWN, 0, 0, 0, 0, 0, 0, 0); } EXPORT_SYMBOL(sbi_set_timer); /** - * sbi_shutdown() - Remove all the harts from executing supervisor code. + * sbi_clear_ipi() - Clear any pending IPIs for the calling hart. * * Return: None */ -void sbi_shutdown(void) +void sbi_clear_ipi(void) { - sbi_ecall(SBI_EXT_0_1_SHUTDOWN, 0, 0, 0, 0, 0, 0, 0); + sbi_ecall(SBI_EXT_0_1_CLEAR_IPI, 0, 0, 0, 0, 0, 0, 0); } EXPORT_SYMBOL(sbi_shutdown); /** - * sbi_clear_ipi() - Clear any pending IPIs for the calling hart. + * sbi_set_timer_v01() - Program the timer for next timer event. + * @stime_value: The value after which next timer event should fire. * * Return: None */ -void sbi_clear_ipi(void) +static void __sbi_set_timer_v01(uint64_t stime_value) { - sbi_ecall(SBI_EXT_0_1_CLEAR_IPI, 0, 0, 0, 0, 0, 0, 0); +#if __riscv_xlen == 32 + sbi_ecall(SBI_EXT_0_1_SET_TIMER, 0, stime_value, + stime_value >> 32, 0, 0, 0, 0); +#else + sbi_ecall(SBI_EXT_0_1_SET_TIMER, 0, stime_value, 0, 0, 0, 0, 0); +#endif +} + +static int __sbi_send_ipi_v01(const unsigned long *hart_mask) +{ + sbi_ecall(SBI_EXT_0_1_SEND_IPI, 0, (unsigned long)hart_mask, + 0, 0, 0, 0, 0); + return 0; +} + +static int __sbi_rfence_v01(int fid, const unsigned long *hart_mask, + unsigned long hbase, unsigned long start, + unsigned long size, unsigned long arg4, + unsigned long arg5) +{ + int result = 0; + + /* v0.2 function IDs are equivalent to v0.1 extension IDs */ + switch (fid) { + case SBI_EXT_RFENCE_REMOTE_FENCE_I: + sbi_ecall(SBI_EXT_0_1_REMOTE_FENCE_I, 0, + (unsigned long)hart_mask, 0, 0, 0, 0, 0); + break; + case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA: + sbi_ecall(SBI_EXT_0_1_REMOTE_SFENCE_VMA, 0, + (unsigned long)hart_mask, start, size, + 0, 0, 0); + break; + case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID: + sbi_ecall(SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID, 0, + (unsigned long)hart_mask, start, size, + arg4, 0, 0); + break; + default: + pr_err("SBI call [%d]not supported in SBI v0.1\n", fid); + result = -EINVAL; + } + + return result; +} +#else +static void __sbi_set_timer_v01(uint64_t stime_value) +{ + pr_warn("Timer extension is not available in SBI v%lu.%lu\n", + sbi_major_version(), sbi_minor_version()); +} +static int __sbi_send_ipi_v01(const unsigned long *hart_mask) +{ + pr_warn("IPI extension is not available in SBI v%lu.%lu\n", + sbi_major_version(), sbi_minor_version()); + + return 0; +} +static int __sbi_rfence_v01(int fid, + const unsigned long *hart_mask, + unsigned long hbase, unsigned long start, + unsigned long size, unsigned long arg4, + unsigned long arg5) +{ + pr_warn("remote fence extension is not available in SBI v%lu.%lu\n", + sbi_major_version(), sbi_minor_version()); + + return 0; +} +#endif /* CONFIG_RISCV_SBI_V01 */ + +/** + * sbi_set_timer() - Program the timer for next timer event. + * @stime_value: The value after which next timer event should fire. + * + * Return: None + */ +void sbi_set_timer(uint64_t stime_value) +{ + __sbi_set_timer(stime_value); } /** @@ -130,11 +212,11 @@ void sbi_clear_ipi(void) */ void sbi_send_ipi(const unsigned long *hart_mask) { - sbi_ecall(SBI_EXT_0_1_SEND_IPI, 0, (unsigned long)hart_mask, - 0, 0, 0, 0, 0); + __sbi_send_ipi(hart_mask); } EXPORT_SYMBOL(sbi_send_ipi); + /** * sbi_remote_fence_i() - Execute FENCE.I instruction on given remote harts. * @hart_mask: A cpu mask containing all the target harts. @@ -143,8 +225,8 @@ EXPORT_SYMBOL(sbi_send_ipi); */ void sbi_remote_fence_i(const unsigned long *hart_mask) { - sbi_ecall(SBI_EXT_0_1_REMOTE_FENCE_I, 0, (unsigned long)hart_mask, - 0, 0, 0, 0, 0); + __sbi_rfence(SBI_EXT_RFENCE_REMOTE_FENCE_I, + hart_mask, 0, 0, 0, 0, 0); } EXPORT_SYMBOL(sbi_remote_fence_i); @@ -161,8 +243,8 @@ void sbi_remote_sfence_vma(const unsigned long *hart_mask, unsigned long start, unsigned long size) { - sbi_ecall(SBI_EXT_0_1_REMOTE_SFENCE_VMA, 0, - (unsigned long)hart_mask, start, size, 0, 0, 0); + __sbi_rfence(SBI_EXT_RFENCE_REMOTE_SFENCE_VMA, + hart_mask, 0, start, size, 0, 0); } EXPORT_SYMBOL(sbi_remote_sfence_vma); @@ -182,8 +264,8 @@ void sbi_remote_sfence_vma_asid(const unsigned long *hart_mask, unsigned long size, unsigned long asid) { - sbi_ecall(SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID, 0, - (unsigned long)hart_mask, start, size, asid, 0, 0); + __sbi_rfence(SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID, + hart_mask, 0, start, size, asid, 0); } EXPORT_SYMBOL(sbi_remote_sfence_vma_asid); @@ -249,8 +331,15 @@ int __init sbi_init(void) pr_info("SBI specification v%lu.%lu detected\n", sbi_major_version(), sbi_minor_version()); - if (!sbi_spec_is_0_1()) + + if (!sbi_spec_is_0_1()) { pr_info("SBI implementation ID=0x%lx Version=0x%lx\n", sbi_get_firmware_id(), sbi_get_firmware_version()); + } + + __sbi_set_timer = __sbi_set_timer_v01; + __sbi_send_ipi = __sbi_send_ipi_v01; + __sbi_rfence = __sbi_rfence_v01; + return 0; } -- 2.24.0