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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id CE910C3ABCB for ; Mon, 12 May 2025 18:12:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:From:References:Cc:To:Subject: MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=AgNVUCunSRN1htjqRtyWJtKPgRDjo94rK6p+iPKsOyM=; b=B86jIoxAEcyD0P R6EXQCc0gzC5c3+Zrp0JHHWj9i2bUCF3/9P437V2mALzeaY9733vbyc2iQBGGtSZW9lBa3OPuGLN5 kFXQE/5+uRCBp3yb/CEsGsP/K0wcNrwFX4/bGegULx0gpDUTvEF4BXpn8N8is8440SYq4Dq+gy4Pb Q/UPnFhv4/GxG28lRQ2UdY5b67LvKyL999sV7bngKo0CgDVRaowZ4CtWem9Sn+6yCZM7ougKj+DcZ 29Tj+DEqIbO1CnHMh2P+Xt9b6zGQoJZPACkGhnHpomGYnHwH1Wy74RvdpczZEeccSonz4jYgPkoLh Q+GFKT3k6kmd1/HE4Ncw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uEXdw-0000000AJh4-1utg; Mon, 12 May 2025 18:12:48 +0000 Received: from out-179.mta0.migadu.com ([2001:41d0:1004:224b::b3]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uEXS4-0000000AGuU-0V3H for kvm-riscv@lists.infradead.org; Mon, 12 May 2025 18:00:34 +0000 Message-ID: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1747072827; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ma5n1WWRt3IZMb/J5uvgHDAZKLn3T38CaI/Jo/Q76W4=; b=hGlf2DxK/ll+4zVXxruxyenHniDCnXz8vzRbFapb8hUS/itdZEy/TPz0teFHV4TatUnnP5 BZv20ibsOKJy8hV5P8G/DZG5leGxmgDJH5uq+u9fW1PbSJFjurDRqz8BLE1IErge+GiHcI Rumre5V3Jb6JPbLB6RELqbbucJ4f7ug= Date: Mon, 12 May 2025 11:00:21 -0700 MIME-Version: 1.0 Subject: Re: [PATCH v6 04/14] riscv: sbi: add FWFT extension interface To: =?UTF-8?B?Q2zDqW1lbnQgTMOpZ2Vy?= , Paul Walmsley , Palmer Dabbelt , Anup Patel , Atish Patra , Shuah Khan , Jonathan Corbet , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-kselftest@vger.kernel.org Cc: Samuel Holland , Andrew Jones , Deepak Gupta References: <20250424173204.1948385-1-cleger@rivosinc.com> <20250424173204.1948385-5-cleger@rivosinc.com> <1c385a47-0a01-4be4-a34b-51a2f168e62d@linux.dev> Content-Language: en-US X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Atish Patra In-Reply-To: X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250512_110032_709201_0D3385BA X-CRM114-Status: GOOD ( 14.57 ) X-BeenThere: kvm-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: "kvm-riscv" Errors-To: kvm-riscv-bounces+kvm-riscv=archiver.kernel.org@lists.infradead.org Ck9uIDUvMTIvMjUgMToxNCBBTSwgQ2zDqW1lbnQgTMOpZ2VyIHdyb3RlOgo+Cj4gT24gMDkvMDUv MjAyNSAwMjoxOCwgQXRpc2ggUGF0cmEgd3JvdGU6Cj4+IE9uIDQvMjQvMjUgMTA6MzEgQU0sIENs w4PCqW1lbnQgTMODwqlnZXIgd3JvdGU6Cj4+PiBUaGlzIFNCSSBleHRlbnNpb25zIGVuYWJsZXMg c3VwZXJ2aXNvciBtb2RlIHRvIGNvbnRyb2wgZmVhdHVyZSB0aGF0IGFyZQo+Pj4gdW5kZXIgTS1t b2RlIGNvbnRyb2wgKEZvciBpbnN0YW5jZSwgU3ZhZHUgbWVudmNmZyBBRFVFIGJpdCwgU3NkYmx0 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content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ma5n1WWRt3IZMb/J5uvgHDAZKLn3T38CaI/Jo/Q76W4=; b=hGlf2DxK/ll+4zVXxruxyenHniDCnXz8vzRbFapb8hUS/itdZEy/TPz0teFHV4TatUnnP5 BZv20ibsOKJy8hV5P8G/DZG5leGxmgDJH5uq+u9fW1PbSJFjurDRqz8BLE1IErge+GiHcI Rumre5V3Jb6JPbLB6RELqbbucJ4f7ug= Date: Mon, 12 May 2025 11:00:21 -0700 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Subject: Re: [PATCH v6 04/14] riscv: sbi: add FWFT extension interface To: =?UTF-8?B?Q2zDqW1lbnQgTMOpZ2Vy?= , Paul Walmsley , Palmer Dabbelt , Anup Patel , Atish Patra , Shuah Khan , Jonathan Corbet , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-kselftest@vger.kernel.org Cc: Samuel Holland , Andrew Jones , Deepak Gupta References: <20250424173204.1948385-1-cleger@rivosinc.com> <20250424173204.1948385-5-cleger@rivosinc.com> <1c385a47-0a01-4be4-a34b-51a2f168e62d@linux.dev> Content-Language: en-US X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Atish Patra In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT On 5/12/25 1:14 AM, Clément Léger wrote: > > On 09/05/2025 02:18, Atish Patra wrote: >> On 4/24/25 10:31 AM, Clément Léger wrote: >>> This SBI extensions enables supervisor mode to control feature that are >>> under M-mode control (For instance, Svadu menvcfg ADUE bit, Ssdbltrp >>> DTE, etc). Add an interface to set local features for a specific cpu >>> mask as well as for the online cpu mask. >>> >>> Signed-off-by: Clément Léger >>> Reviewed-by: Andrew Jones >>> --- >>>   arch/riscv/include/asm/sbi.h | 17 +++++++++++ >>>   arch/riscv/kernel/sbi.c      | 57 ++++++++++++++++++++++++++++++++++++ >>>   2 files changed, 74 insertions(+) >>> >>> diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h >>> index 7ec249fea880..3bbef56bcefc 100644 >>> --- a/arch/riscv/include/asm/sbi.h >>> +++ b/arch/riscv/include/asm/sbi.h >>> @@ -503,6 +503,23 @@ int sbi_remote_hfence_vvma_asid(const struct >>> cpumask *cpu_mask, >>>                   unsigned long asid); >>>   long sbi_probe_extension(int ext); >>>   +int sbi_fwft_set(u32 feature, unsigned long value, unsigned long >>> flags); >>> +int sbi_fwft_set_cpumask(const cpumask_t *mask, u32 feature, >>> +             unsigned long value, unsigned long flags); >>> +/** >>> + * sbi_fwft_set_online_cpus() - Set a feature on all online cpus >>> + * @feature: The feature to be set >>> + * @value: The feature value to be set >>> + * @flags: FWFT feature set flags >>> + * >>> + * Return: 0 on success, appropriate linux error code otherwise. >>> + */ >>> +static inline int sbi_fwft_set_online_cpus(u32 feature, unsigned long >>> value, >>> +                       unsigned long flags) >>> +{ >>> +    return sbi_fwft_set_cpumask(cpu_online_mask, feature, value, flags); >>> +} >>> + >>>   /* Check if current SBI specification version is 0.1 or not */ >>>   static inline int sbi_spec_is_0_1(void) >>>   { >>> diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c >>> index 1d44c35305a9..d57e4dae7dac 100644 >>> --- a/arch/riscv/kernel/sbi.c >>> +++ b/arch/riscv/kernel/sbi.c >>> @@ -299,6 +299,63 @@ static int __sbi_rfence_v02(int fid, const struct >>> cpumask *cpu_mask, >>>       return 0; >>>   } >>>   +/** >>> + * sbi_fwft_set() - Set a feature on the local hart >>> + * @feature: The feature ID to be set >>> + * @value: The feature value to be set >>> + * @flags: FWFT feature set flags >>> + * >>> + * Return: 0 on success, appropriate linux error code otherwise. >>> + */ >>> +int sbi_fwft_set(u32 feature, unsigned long value, unsigned long flags) >>> +{ >>> +    return -EOPNOTSUPP; >>> +} >>> + >>> +struct fwft_set_req { >>> +    u32 feature; >>> +    unsigned long value; >>> +    unsigned long flags; >>> +    atomic_t error; >>> +}; >>> + >>> +static void cpu_sbi_fwft_set(void *arg) >>> +{ >>> +    struct fwft_set_req *req = arg; >>> +    int ret; >>> + >>> +    ret = sbi_fwft_set(req->feature, req->value, req->flags); >>> +    if (ret) >>> +        atomic_set(&req->error, ret); >> What happens when cpuX executed first reported an error but cpuY >> executed this function later and report success. >> >> The error will be masked in that case. > We actually only set the bit if an error happened (consider it as a > sticky error bit). So if CPUy reports success, it won't clear the bit. Ahh yes. I missed that. > Thanks, > > Clément > >>> +} >>> + >>> +/** >>> + * sbi_fwft_set_cpumask() - Set a feature for the specified cpumask >>> + * @mask: CPU mask of cpus that need the feature to be set >>> + * @feature: The feature ID to be set >>> + * @value: The feature value to be set >>> + * @flags: FWFT feature set flags >>> + * >>> + * Return: 0 on success, appropriate linux error code otherwise. >>> + */ >>> +int sbi_fwft_set_cpumask(const cpumask_t *mask, u32 feature, >>> +                   unsigned long value, unsigned long flags) >>> +{ >>> +    struct fwft_set_req req = { >>> +        .feature = feature, >>> +        .value = value, >>> +        .flags = flags, >>> +        .error = ATOMIC_INIT(0), >>> +    }; >>> + >>> +    if (feature & SBI_FWFT_GLOBAL_FEATURE_BIT) >>> +        return -EINVAL; >>> + >>> +    on_each_cpu_mask(mask, cpu_sbi_fwft_set, &req, 1); >>> + >>> +    return atomic_read(&req.error); >>> +} >>> + >>>   /** >>>    * sbi_set_timer() - Program the timer for next timer event. >>>    * @stime_value: The value after which next timer event should fire. 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id F1F97C3ABCB for ; Mon, 12 May 2025 18:12:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:From:References:Cc:To:Subject: MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=5tAFf0kQyHUNteyJPdI6PT9F/7aPsgIm2y9Idhz97gI=; b=JoaP9yMI1XSRrV 9S8iYOXa+4ElaADkCZ0DL7f6UYeUZs/FmCqMXDKaDrqBymb60dnvwMPQFNYrJdankYosi5kw6iUYK Qx4S+tg6LLK5TkHj0mBYcCziLQ8+swKkGd2if1MoziEIPDAfmdYpGzNwip5xZ9xbkLZGUgOcC0ngG Don1q+0Q1it35AvXoWMdlCqIlLz74PFk4cjBh0MpN9i1iCrnD25Tc02w3xaCy7oudUHkZdLPmSF4X iKs5oxKA5YYNmQR3ZBDuhZYwQMXht0AASQKc7irVmiMLSP8qXy9bDz7mDNxBLB2PTM7L7NeN41FZX IOf9RJIxm40Pa0WPY5QA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uEXdw-0000000AJhJ-3HVx; Mon, 12 May 2025 18:12:48 +0000 Received: from out-174.mta0.migadu.com ([91.218.175.174]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uEXSC-0000000AGvI-0T1X for linux-riscv@lists.infradead.org; Mon, 12 May 2025 18:00:41 +0000 Message-ID: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1747072827; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ma5n1WWRt3IZMb/J5uvgHDAZKLn3T38CaI/Jo/Q76W4=; b=hGlf2DxK/ll+4zVXxruxyenHniDCnXz8vzRbFapb8hUS/itdZEy/TPz0teFHV4TatUnnP5 BZv20ibsOKJy8hV5P8G/DZG5leGxmgDJH5uq+u9fW1PbSJFjurDRqz8BLE1IErge+GiHcI Rumre5V3Jb6JPbLB6RELqbbucJ4f7ug= Date: Mon, 12 May 2025 11:00:21 -0700 MIME-Version: 1.0 Subject: Re: [PATCH v6 04/14] riscv: sbi: add FWFT extension interface To: =?UTF-8?B?Q2zDqW1lbnQgTMOpZ2Vy?= , Paul Walmsley , Palmer Dabbelt , Anup Patel , Atish Patra , Shuah Khan , Jonathan Corbet , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-kselftest@vger.kernel.org Cc: Samuel Holland , Andrew Jones , Deepak Gupta References: <20250424173204.1948385-1-cleger@rivosinc.com> <20250424173204.1948385-5-cleger@rivosinc.com> <1c385a47-0a01-4be4-a34b-51a2f168e62d@linux.dev> Content-Language: en-US X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Atish Patra In-Reply-To: X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250512_110040_442831_62B5AC17 X-CRM114-Status: GOOD ( 14.57 ) 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 Ck9uIDUvMTIvMjUgMToxNCBBTSwgQ2zDqW1lbnQgTMOpZ2VyIHdyb3RlOgo+Cj4gT24gMDkvMDUv MjAyNSAwMjoxOCwgQXRpc2ggUGF0cmEgd3JvdGU6Cj4+IE9uIDQvMjQvMjUgMTA6MzEgQU0sIENs w4PCqW1lbnQgTMODwqlnZXIgd3JvdGU6Cj4+PiBUaGlzIFNCSSBleHRlbnNpb25zIGVuYWJsZXMg c3VwZXJ2aXNvciBtb2RlIHRvIGNvbnRyb2wgZmVhdHVyZSB0aGF0IGFyZQo+Pj4gdW5kZXIgTS1t b2RlIGNvbnRyb2wgKEZvciBpbnN0YW5jZSwgU3ZhZHUgbWVudmNmZyBBRFVFIGJpdCwgU3NkYmx0 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