From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=217.140.110.172 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793747466; b=S/Pt1ZFPUV3Co8WpMDsvTiXmVRcl83aSdpLmnEmvfJC9EAtjxIde1A0qs4io9E5izDyr woO38NP66F2XH4evh2kQokAR8zYinN9m53XjzODIIC2tKeKaovM5uGferqQkUOsFTbFFV /uws8gVcc0LMSFWOHxlRM8tSueC1ZD27F6N5p7TnqKz+CprUnMBySfrBiVM2cZIxa0P61 wfaj+QK/5znUBxU4HU8Z2MAqL2xGj+nXDcW0kjdc0JUp0BBbHWBrTzb0FFC1l3hamkuZk YoqvffYJaPWwOdEquHIq8t37MTzMQ0LavGbVXOWZ4fso1wugNdLtN0/4BzhVtnSFuiQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793747466; h=DMARC-Filter:Received:Received:DKIM-Signature:From:To:Cc:Subject: Date:Message-Id:X-Mailer:In-Reply-To:References:MIME-Version: Content-Transfer-Encoding; bh=hnRNJDC9zZzpskW7KFxOEfChNL+3CoFVY77+rrtTJUk=; b=oVhpIJ1/62+81Bo6dk1F8RfhT53i94WG5LE/Bo50XjeeXnGRuQmEpzaTO7Ts3K7jFIdG sgBpk+adFEnX676WAzTuxTgFF1WICmmU+xKIU9+H3NzXN4yDeoLh5PUHB6dByY3ZL41aP jqoLvxp5LtQI7dX7MiGjjpZPs5kP6j0cA55n0M/lp6rhluRZ1ND/mjJqh992L1GBnWvPp 4diY6ecE9JKSKtGv2DUY9pIbV57oVNJwQ6qTPHE9bVpg3uZHXE+clpLjBrCs1MK+jZHCy yzTFL5C2jcQZpQkXJ3KPNkp8ljZh5NZYYrBP5ZtvfyHgxIphNRqjcq0DR3klsvIFkbQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass header.d=arm.com header.i=@arm.com header.a=rsa-sha256 header.s=foss header.b=Dm8azli5; arc=none smtp.remote-ip=217.140.110.172 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 0552D606A33D; Tue, 3 Nov 2026 23:10:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 0552D606A33D Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=arm.com header.i=@arm.com header.a=rsa-sha256 header.s=foss header.b=Dm8azli5 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 589581595; Tue, 3 Nov 2026 15:10:55 -0800 (PST) Received: from e121740.manchester.arm.com (e121740.arm.com [10.33.8.69]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C54AD3F673; Tue, 3 Nov 2026 15:10:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1793747458; bh=TheZWpVaLFvYFp0EOHxjK4eXwGVqyf0Ejvl0GkdFhEA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Dm8azli55m6AwuvsF2cZVyMMUpBi5OYK26MKqFtJcVy6AN3Js6kog8ehGs09k/WvA Ll++b88DJLxT2WzTv0oX9aERuA2aQc8uMnUVvrK6ID/CS2WJN8rL7wYvSaDWpK2Ce+ qoR+giYC4iQf1zav2322Sy104Ico+qqkI1N1PqNc= From: Philip Radford To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, arm-scmi@vger.kernel.org, linux-pm@vger.kernel.org Cc: sudeep.holla@arm.com, james.quinlan@broadcom.com, f.fainelli@gmail.com, vincent.guittot@linaro.org, etienne.carriere@st.com, peng.fan@oss.nxp.com, michal.simek@amd.com, quic_sibis@quicinc.com, dan.carpenter@linaro.org, d-gole@ti.com, souvik.chakravarty@arm.com, Philip Radford Subject: [PATCH v10 12/13] powercap: arm_scmi: Add get_power_uw to synthetic node Date: Tue, 3 Nov 2026 23:10:06 +0000 Message-Id: <20261103231007.537082-13-philip.radford@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20261103231007.537082-1-philip.radford@arm.com> References: <20261103231007.537082-1-philip.radford@arm.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Exposes the current power usage from the immediate children of the synthetic (root) powercap node. Iterates over pr->spzones and sums per-zone power. Domains without powercap monitoring are skipped. If none of the children can be measured, return -ENODATA. Signed-off-by: Philip Radford --- V9->V10 - skip immediate child zones that do not support power monitoring - return -ENODATA if none of the synthetic root children can be measured --- drivers/powercap/arm_scmi_powercap.c | 46 ++++++++++++++++++++++++++-- 1 file changed, 44 insertions(+), 2 deletions(-) diff --git a/drivers/powercap/arm_scmi_powercap.c b/drivers/powercap/arm_scmi_powercap.c index 88003564581e..d0255fd42007 100644 --- a/drivers/powercap/arm_scmi_powercap.c +++ b/drivers/powercap/arm_scmi_powercap.c @@ -17,6 +17,9 @@ #define to_scmi_powercap_zone(z) \ container_of(z, struct scmi_powercap_zone, zone) +#define to_scmi_powercap_root(z) \ + container_of(z, struct scmi_powercap_root, instance_root.zone) + static const struct scmi_powercap_proto_ops *powercap_ops; struct scmi_powercap_zone { @@ -431,9 +434,48 @@ static int instance_root_release(struct powercap_zone *pz) return 0; } -static int instance_root_get_power_uw(struct powercap_zone *pz, u64 *v) +static int instance_root_get_power_uw(struct powercap_zone *pz, u64 *power_uw) { - *v = 0; + struct scmi_powercap_root *pr = to_scmi_powercap_root(pz); + struct scmi_powercap_zone *child; + + u64 p, acc = 0; + int i, ret; + bool measured = false; + + if (!pz || !power_uw) + return -EINVAL; + + for (i = 0; i < pr->num_zones; i++) { + child = &pr->spzones[i]; + + if (!child->registered || child->invalid) + continue; + + if (child->info->parent_id != SCMI_POWERCAP_ROOT_ZONE_ID) + continue; + + /* + * The synthetic root reports the sum of measureable immediate children. + * Control-only children do not contribute to the sum. + */ + if (!child->info->powercap_monitoring) + continue; + + ret = scmi_powercap_get_power_uw(&child->zone, &p); + if (ret) { + dev_dbg(child->dev, "Failed to read child power: %d\n", ret); + return ret; + } + + acc += p; + measured = true; + } + + if (!measured) + return -ENODATA; + + *power_uw = acc; return 0; } -- 2.34.1