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 8CAB2FF8855 for ; Tue, 5 May 2026 20:13:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: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=hwJ6qCmLnOy8BolwqQ60SGBJBSzqjRVBqGa9Z20Q2GQ=; b=t/rwPY2cjNNtDDOavNAlHIkXvo LiHTxb0R4ULmsN1NvjTvJO3yG3kbGM6pHJJZzdFzrS957LQafECqcQkkhDxxEGkmH4stGTBR+Qj3C Yzr8CKcqLSEhi+2DXArpWRspkLdIOpU2SC72pTY1CqIgaQ4CQ0MDUZiciaI2MPvq5Rk11bxEP37Ll zbdPlaxFiR9QyEL1dyigjE1BI5zgOmeG6dEUfpcqNva54ofvyYVRJM2iJIwv9RCknESgHibUg8Qy9 6iVI8IDVwwv4ej3bmu815gQKHHBbCGHyPLzDVT/95Xd3zZ/HxbV/XiN3LZ/4VFT3Zlq00PvLqY/tF cHD9+DGQ==; 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charset=us-ascii Content-Disposition: inline In-Reply-To: <20260428090922.346069-7-philip.radford@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260505_131347_173359_2A859623 X-CRM114-Status: GOOD ( 23.01 ) 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 Tue, Apr 28, 2026 at 10:09:15AM +0100, Philip Radford wrote: > Extend scmi_powercap_meas_changed_report to include MAI change > notifications. > Hi > Signed-off-by: Philip Radford > --- > drivers/firmware/arm_scmi/powercap.c | 20 ++++++++++++-------- > include/linux/scmi_protocol.h | 1 + > 2 files changed, 13 insertions(+), 8 deletions(-) > > diff --git a/drivers/firmware/arm_scmi/powercap.c b/drivers/firmware/arm_scmi/powercap.c > index 1d1188e98d49..b9d50f4e8ae5 100644 > --- a/drivers/firmware/arm_scmi/powercap.c > +++ b/drivers/firmware/arm_scmi/powercap.c > @@ -11,6 +11,7 @@ > #include > #include > #include > +#include > > #include > > @@ -164,6 +165,7 @@ struct scmi_powercap_meas_changed_notify_payld { > __le32 agent_id; > __le32 domain_id; > __le32 power; > + __le32 mai; > }; > > struct scmi_msg_powercap_cpc { > @@ -1212,13 +1214,6 @@ static int scmi_powercap_notify(const struct scmi_protocol_handle *ph, > if (ret) > return ret; > > - if (enable && !low && !high) { > - dev_err(ph->dev, > - "Invalid Measurements Notify thresholds: %u/%u\n", > - low, high); > - return -EINVAL; > - } > - Ok so you removed this check because now that a notification can be emitted even only to notify a MAI change, it is possible that the thresholds are zero and the notification will be emitted anyway due to a MAI change....BUT you have to review or completely remove the comment block that precedes this that says: /* * Note that we have to pick the most recently configured * thresholds to build a proper POWERCAP_MEASUREMENTS_NOTIFY * enable request and we fail, complaining, if no thresholds * were ever set, since this is an indication the API has been * used wrongly. */ ...becasue NOW is no more true and misleading, since you just removed the fail and complain part... It would be good to shortly explain in a comment the new possible scenarios in which notification can be enabled... > ret = ph->xops->xfer_get_init(ph, message_id, > sizeof(*notify), 0, &t); > if (ret) > @@ -1333,14 +1328,23 @@ scmi_powercap_fill_custom_report(const struct scmi_protocol_handle *ph, > { > const struct scmi_powercap_meas_changed_notify_payld *p = payld; > struct scmi_powercap_meas_changed_report *r = report; > + const size_t sz_v2 = offsetofend(struct scmi_powercap_meas_changed_notify_payld, > + power); > + const size_t sz_v3 = sizeof(*p); While this is a valid and nice construct, I think is overkill here since these offsets/sizes will never change at runtime.... ...you can just define above a couples of DEFINE that hardcodes the sizes of the v2 and v3 by using the #define SZ_V2 (sizeof(struct scmi_powercap_meas_changed_notify_payld)) and #define SZ_V3 (SZ_V2 - sizeof(__le32)) > > - if (sizeof(*p) != payld_sz) > + if (payld_sz != sz_v2 && payld_sz != sz_v3) > break; > > r->timestamp = timestamp; > r->agent_id = le32_to_cpu(p->agent_id); > r->domain_id = le32_to_cpu(p->domain_id); > r->power = le32_to_cpu(p->power); maybe more clear to simply: r->mai = 0; if (payld_sz == SZ_V3 && PROTOCOL_REV_MAJOR(ph->version) >= 0x3) r->mai = le32_to_cpu(p->mai); > + > + if (payld_sz == sz_v3 && PROTOCOL_REV_MAJOR(ph->version) >= 0x3) > + r->mai = le32_to_cpu(p->mai); > + else > + r->mai = 0; > + > *src_id = r->domain_id; Thanks, Cristian