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 3BB1ED216A4 for ; Thu, 4 Dec 2025 16:16:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=WbzZf3YagGxv+DbpTYzrEt4hvyHJGJ46u9+M7nM8myQ=; b=ahV0t+7np3i1vc1QTDvEX5r3IR N/e7VAZWxDSaDUmRzV1C/oahXOU/jVsR9bzwlAMMoNeqqyP9bgvhFyYjgL2XMgBGW2vCN60PnFehJ A+twqnn1cisK8PiCi5BrYm0NK4u7ew/9nRKw8oDpujcrEHcZufbRxul86HQYvoRJf75ArtOFa2ozh eD3DT7Z1qK7CCVgutrIQ2dJ3hm3n4fnHRQ7a2Id3agJtit6r1TfE+I3157Cznz3YGSoAFx2P3ESzT wlHXpUQwOfzekTfqut0Ytj3buujBcYFWBmJzEBfA9Gw953jtOWWjnZeTTmZzg/AmbovfRwKzO2Cil ro5jRsAA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vRC0M-00000008Gv4-0a9j; Thu, 04 Dec 2025 16:16:30 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vRC0J-00000008Guh-1klc for linux-arm-kernel@lists.infradead.org; Thu, 04 Dec 2025 16:16:28 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 82233339; Thu, 4 Dec 2025 08:16:18 -0800 (PST) Received: from bogus (e133711.arm.com [10.1.196.55]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id AE72C3F66E; Thu, 4 Dec 2025 08:16:24 -0800 (PST) Date: Thu, 4 Dec 2025 16:16:21 +0000 From: Sudeep Holla To: Artem Shimko Cc: cristian.marussi@arm.com, arm-scmi@vger.kernel.org, Artem Shimko , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v4] firmware: arm_scmi: refactor reset domain handling Message-ID: <20251204-slick-granite-chameleon-58ebc2@sudeepholla> References: <20251123163557.230530-1-a.shimko.dev@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251123163557.230530-1-a.shimko.dev@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251204_081627_609943_018FFBB8 X-CRM114-Status: GOOD ( 24.56 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Sun, Nov 23, 2025 at 07:35:57PM +0300, Artem Shimko wrote: > Improve the SCMI reset protocol implementation by centralizing domain > validation and enhancing error handling. > > Add scmi_reset_domain_lookup() helper function to validate > domain ids and return appropriate error codes. Refactor all > domain-specific functions to use this helper, ensuring consistent > error handling throughout the reset protocol. > > Suggested-by: Cristian Marussi > Signed-off-by: Artem Shimko > --- > > Hi Cristian, > > Thank you for suggesting! If it works for you I'll try to improve the others protocols. > > It was tested on my board in QEMU and on real hardware. > The functionality didn't break, and peripherals that are reseted via SCMI work correctly. > > As an example, I can provide DMA test results (as one of the processor units dependent on SCMI reset). > > [ 2.559040] dw_axi_dmac_platform 1000nda0.nda_dma_0: DesignWare AXI DMA Controller, nda channels > [ 2.569265] dw_axi_dmac_platform 1000nda0.nda_dma_1: DesignWare AXI DMA Controller, nda channels > [ 2.580601] dw_axi_dmac_platform 1000nda0.nda_dma_2: DesignWare AXI DMA Controller, nda channels > > # echo 2000 > /sys/module/dmatest/parameters/timeout > # echo 1000 > /sys/module/dmatest/parameters/iterations > # echo dma0chan0 > /sys/module/dmatest/parameters/channel > [ 95.917504] dmatest: Added 1 threads using dma0chan0 > # echo 1 > /sys/module/dmatest/parameters/run > [ 101.931372] dmatest: Started 1 threads using dma0chan0 > [ 102.731009] dmatest: dma0chan0-copy0: summary 1000 tests, 0 failures 2508.42 iops 19706 KB/s (0) > > And vice versa: > > 1. Confirmed that the DMA module is non-functional without a proper reset via SCMI. > Disabling the reset logic causes a system crash on first access to its registers. > > 2. Requesting a non-existent reset domain: > > [ 2.463400] dw_axi_dmac_platform 1000nda0.nda_dma_0: error -EINVAL: Failed to deassert resets > [ 2.472091] dw_axi_dmac_platform 1000nda0.nda_dma_0: probe with driver dw_axi_dmac_platform failed with error -22 > [ 2.482911] dw_axi_dmac_platform 1000nda0.nda_dma_1: error -EINVAL: Failed to deassert resets > [ 2.491553] dw_axi_dmac_platform 1000nda0.nda_dma_1: probe with driver dw_axi_dmac_platform failed with error -22 > [ 2.502256] dw_axi_dmac_platform 1000nda0.nda_dma_2: error -EINVAL: Failed to deassert resets > [ 2.510735] dw_axi_dmac_platform 1000nda0.nda_dma_2: probe with driver dw_axi_dmac_platform failed with error -22 > > -- > Regards, > Artem > > --- > ChangeLog: > v4: Add Suggested-by tag > > drivers/firmware/arm_scmi/reset.c | 59 ++++++++++++++++++++----------- > 1 file changed, 39 insertions(+), 20 deletions(-) > > diff --git a/drivers/firmware/arm_scmi/reset.c b/drivers/firmware/arm_scmi/reset.c > index 0aa82b96f41b..9854a3016d13 100644 > --- a/drivers/firmware/arm_scmi/reset.c > +++ b/drivers/firmware/arm_scmi/reset.c > @@ -100,6 +100,7 @@ static int scmi_reset_attributes_get(const struct scmi_protocol_handle *ph, > > static int > scmi_reset_domain_attributes_get(const struct scmi_protocol_handle *ph, > + struct reset_dom_info *dom_info, Instead of changing this, ... > struct scmi_reset_info *pinfo, > u32 domain, u32 version) > { > @@ -107,7 +108,6 @@ scmi_reset_domain_attributes_get(const struct scmi_protocol_handle *ph, > u32 attributes; > struct scmi_xfer *t; > struct scmi_msg_resp_reset_domain_attributes *attr; > - struct reset_dom_info *dom_info = pinfo->dom_info + domain; > ... You can just follow the pattern you have done everywhere else in this change like: struct reset_dom_info *dom_info; dom_info = scmi_reset_domain_lookup(ph, domain); if (IS_ERR(dom_info)) return PTR_ERR(dom_info); Any particular reason for not doing that ? -- Regards, Sudeep