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=-28.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL 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 E0BE1C07E96 for ; Sun, 11 Jul 2021 18:59:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B1E4E61078 for ; Sun, 11 Jul 2021 18:59:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229934AbhGKTCY (ORCPT ); Sun, 11 Jul 2021 15:02:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45166 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229660AbhGKTCX (ORCPT ); Sun, 11 Jul 2021 15:02:23 -0400 Received: from mail-pf1-x42c.google.com (mail-pf1-x42c.google.com [IPv6:2607:f8b0:4864:20::42c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 53837C0613DD for ; Sun, 11 Jul 2021 11:59:35 -0700 (PDT) Received: by mail-pf1-x42c.google.com with SMTP id 21so14137273pfp.3 for ; Sun, 11 Jul 2021 11:59:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:subject:in-reply-to:cc:from:to:message-id:mime-version :content-transfer-encoding; bh=lWmybwGMDbSIrQTaOsACpTlaJm7TqJFPonmW1qBTdkA=; b=PQ7T7q2iwbm3mG0WTtd8RI0WP4CBv7GvWfdxx5ktW7O17H+DqMhvIqgxj4nQ7yUN5Q kbBxNOoxK0KKGRG8UzBVze4le3iuxIga2Nm2tRxkNPT/qL5MRZWrwr6slWvlmD5uCCvL 10Js+Mc4t3g2G7q3EBMVsSPO5G+vaQ/SBVI5ezB5LdQFUKdF0YK4XvSkAHVMR6hSjlCk bIkPZQwRBZi/SPgVPx6H3OSPMS8bzgaamKvvbUnyyyQjW99Pyv+93lU+x9fssVw+0yQO OQhypYYIPqgp5XoBqMx5VVLrPglQQnvrDpi2pXCxqiO6YTA2ixmkabu52fRAHHSwD9Zq eqCw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:subject:in-reply-to:cc:from:to:message-id :mime-version:content-transfer-encoding; bh=lWmybwGMDbSIrQTaOsACpTlaJm7TqJFPonmW1qBTdkA=; b=mdv7kjwoxdjexdosFnUMQNooEtWzsdlK+pA2wvaQvhx0zX0bJ0o75LJ7lJBVeUozcm n3HXokKdymO9je8rLqqxK11AmJ/O9HJaCGTFdmPLwtphv6xL29Yf0Kz4iO+Ijop9b/z5 LDUj+68Ea5RU7Hl+HJqRcze9RgBt+eYoY8jdh2yPLdHlRT4nTnVtDLNPBT9GgLXrug1Q fVkJBVpkHjM98+6bt2Fjb0e80ayk+UAUGp+Y7rcEarKAlssDTzAIU+RzktUqjsPktZ9E XlwIgpSRLK58g9RiqMRwq0j0OvZT2F33ZCpb+1j6E2bq5s1nNp86caCyayMPI0TNtf7k GWcg== X-Gm-Message-State: AOAM5310m/cnb9fLTk3dJx/NnP6a0PIS16FP1+smFFisw/Tr4P9UIhxS bPO8gQjSmzPixIp81qZgjuPrqA== X-Google-Smtp-Source: ABdhPJyE+Ph3vbpgW8OJLduZyju3Q6+wPToXqipCjihCKu97dlqKdBTrGZ076E3i76h2eNFxKEkjaQ== X-Received: by 2002:a63:1a4f:: with SMTP id a15mr48982258pgm.313.1626029974413; Sun, 11 Jul 2021 11:59:34 -0700 (PDT) Received: from localhost (76-210-143-223.lightspeed.sntcca.sbcglobal.net. [76.210.143.223]) by smtp.gmail.com with ESMTPSA id y15sm2590951pfn.63.2021.07.11.11.59.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 11 Jul 2021 11:59:33 -0700 (PDT) Date: Sun, 11 Jul 2021 11:59:33 -0700 (PDT) X-Google-Original-Date: Sun, 11 Jul 2021 11:59:31 PDT (-0700) Subject: Re: [PATCH v7 1/1] RISC-V: Use SBI SRST extension when available In-Reply-To: <9ED386A8-60BD-44AE-A3D1-843D3CFDDF8A@wdc.com> CC: anup@brainfault.org, Paul Walmsley , aou@eecs.berkeley.edu, Atish Patra , Alistair Francis , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org From: Palmer Dabbelt To: Anup Patel Message-ID: Mime-Version: 1.0 (MHng) Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 09 Jul 2021 22:01:02 PDT (-0700), Anup Patel wrote: > > > On 08/07/21, 9:22 AM, "Anup Patel" wrote: > > On Wed, Jul 7, 2021 at 1:57 AM Palmer Dabbelt wrote: > > > > On Mon, 21 Jun 2021 21:46:46 PDT (-0700), anup@brainfault.org wrote: > > > Hi Palmer, > > > > > > On Wed, Jun 9, 2021 at 5:43 PM Anup Patel wrote: > > >> > > >> 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) > > > > > > Can you please consider this patch for Linux-5.14-rc1 ? > > > > > > The SBI v0.3 spec is already frozen and this patch has been > > > floating on LKML for quite a few months now. > > > > I didn't realize that SBI-0.3 had been frozed. That link is to a RC, > > the cooresponding v0.3.0 tag isn't in that repo. Can you give me a > > pointer to the frozen spec? > > Here's the link to SBI v0.3.0 tag: > https://github.com/riscv/riscv-sbi-doc/releases/tag/v0.3.0 > > We treat RC tags as frozen in SBI spec because no functional > changes are done in SBI spec after it is tagged as RC. We only > do typo fixes and clarifications on SBI spec RC release. Treating the 0.3.0-rc1 as frozen as soon as it's released is a terrifying policy: some of the fixes I sent in after I saw rc1 released change the actual meaning of the text, even if they were meant to change them to what I thought the intended meaning was supposed to be. That means the actual text of 0.3.0-rc1 and 0.3.0 conflict with each other. Given that frozen comes with a guarntee of backwards compatibility, does that mean that the behavior allowed by 0.3.0-rc1 is compliant with the SBI, even if it was likely just allowed by a wording mistake? If you're going to freeze things at rc1 then you really need to be quite explicit about that, as generally the point of RCs is to elicit review/testing. Looks like I was the only person to have provided any review, so I guess I was the only one who assumed "We don't expect any significant functional changes. We will wait for any further feedback and release the official v0.3 in a month or so." actually meant "this is frozen". > Can you take this patch for Linux-5.14 ?? No, sorry, it's way too late for that. Please be specific about when you freeze specifications in the future, so we can all stay on the same page. > > Regards, > Anup > > Regards, > Anup > > > > > > > > > Regards, > > > Anup > > > > > >> > > >> This patch extends Linux RISC-V SBI implementation to detect > > >> and use SBI SRST extension. > > >> > > >> Signed-off-by: Anup Patel > > >> Reviewed-by: Atish Patra > > >> --- > > >> arch/riscv/include/asm/sbi.h | 24 ++++++++++++++++++++++++ > > >> arch/riscv/kernel/sbi.c | 35 +++++++++++++++++++++++++++++++++++ > > >> 2 files changed, 59 insertions(+) > > >> > > >> diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h > > >> index 0d42693cb65e..289621da4a2a 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 +71,21 @@ 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_version(void) > > >> 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; } > > >> diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c > > >> index 7402a417f38e..9a84f0cb5175 100644 > > >> --- a/arch/riscv/kernel/sbi.c > > >> +++ b/arch/riscv/kernel/sbi.c > > >> @@ -7,6 +7,7 @@ > > >> > > >> #include > > >> #include > > >> +#include > > >> #include > > >> #include > > >> > > >> @@ -501,6 +502,32 @@ int sbi_remote_hfence_vvma_asid(const unsigned long *hart_mask, > > >> } > > >> 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; > > >> -- > > >> 2.25.1 > > >> > 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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS 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 853F9C07E96 for ; Sun, 11 Jul 2021 18:59:55 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 024D46108E for ; Sun, 11 Jul 2021 18:59:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 024D46108E Authentication-Results: mail.kernel.org; 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[76.210.143.223]) by smtp.gmail.com with ESMTPSA id y15sm2590951pfn.63.2021.07.11.11.59.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 11 Jul 2021 11:59:33 -0700 (PDT) Date: Sun, 11 Jul 2021 11:59:33 -0700 (PDT) X-Google-Original-Date: Sun, 11 Jul 2021 11:59:31 PDT (-0700) Subject: Re: [PATCH v7 1/1] RISC-V: Use SBI SRST extension when available In-Reply-To: <9ED386A8-60BD-44AE-A3D1-843D3CFDDF8A@wdc.com> CC: anup@brainfault.org, Paul Walmsley , aou@eecs.berkeley.edu, Atish Patra , Alistair Francis , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org From: Palmer Dabbelt To: Anup Patel Message-ID: Mime-Version: 1.0 (MHng) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210711_115938_718901_67A6D3E7 X-CRM114-Status: GOOD ( 40.51 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org T24gRnJpLCAwOSBKdWwgMjAyMSAyMjowMTowMiBQRFQgKC0wNzAwKSwgQW51cCBQYXRlbCB3cm90 ZToKPiAKPiAKPiDvu79PbiAwOC8wNy8yMSwgOToyMiBBTSwgIkFudXAgUGF0ZWwiIDxhbnVwQGJy YWluZmF1bHQub3JnPiB3cm90ZToKPiAKPiAgICAgT24gV2VkLCBKdWwgNywgMjAyMSBhdCAxOjU3 IEFNIFBhbG1lciBEYWJiZWx0IDxwYWxtZXJkYWJiZWx0QGdvb2dsZS5jb20+IHdyb3RlOgo+ICAg ICA+Cj4gICAgID4gT24gTW9uLCAyMSBKdW4gMjAyMSAyMTo0Njo0NiBQRFQgKC0wNzAwKSwgYW51 cEBicmFpbmZhdWx0Lm9yZyB3cm90ZToKPiAgICAgPiA+IEhpIFBhbG1lciwKPiAgICAgPiA+Cj4g ICAgID4gPiBPbiBXZWQsIEp1biA5LCAyMDIxIGF0IDU6NDMgUE0gQW51cCBQYXRlbCA8YW51cC5w YXRlbEB3ZGMuY29tPiB3cm90ZToKPiAgICAgPiA+Pgo+ICAgICA+ID4+IFRoZSBTQkkgU1JTVCBl eHRlbnNpb24gcHJvdmlkZXMgYSBzdGFuZGFyZCB3YXkgdG8gcG93ZXJvZmYgYW5kCj4gICAgID4g Pj4gcmVib290IHRoZSBzeXN0ZW0gaXJyZXNwZWN0aXZlIHRvIHdoZXRoZXIgTGludXggUklTQy1W 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