From patchwork Mon Dec 20 15:14:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ricardo Neri X-Patchwork-Id: 527342 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0BEA3C433EF for ; Mon, 20 Dec 2021 15:24:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230004AbhLTPYV (ORCPT ); Mon, 20 Dec 2021 10:24:21 -0500 Received: from mga11.intel.com ([192.55.52.93]:58159 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235977AbhLTPXF (ORCPT ); Mon, 20 Dec 2021 10:23:05 -0500 X-IronPort-AV: E=McAfee;i="6200,9189,10203"; a="237732829" X-IronPort-AV: E=Sophos;i="5.88,220,1635231600"; d="scan'208";a="237732829" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Dec 2021 07:16:07 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.88,220,1635231600"; d="scan'208";a="484086910" Received: from ranerica-svr.sc.intel.com ([172.25.110.23]) by orsmga002.jf.intel.com with ESMTP; 20 Dec 2021 07:16:06 -0800 From: Ricardo Neri To: "Rafael J. Wysocki" , Daniel Lezcano , linux-pm@vger.kernel.org Cc: x86@kernel.org, linux-doc@vger.kernel.org, Len Brown , Srinivas Pandruvada , Aubrey Li , Amit Kucheria , Andi Kleen , Tim Chen , Lukasz Luba , "Ravi V. Shankar" , Ricardo Neri , linux-kernel@vger.kernel.org Subject: [PATCH v2 6/7] thermal: netlink: Add a new event to notify CPU capabilities change Date: Mon, 20 Dec 2021 07:14:37 -0800 Message-Id: <20211220151438.1196-7-ricardo.neri-calderon@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20211220151438.1196-1-ricardo.neri-calderon@linux.intel.com> References: <20211220151438.1196-1-ricardo.neri-calderon@linux.intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: Srinivas Pandruvada Add a new netlink event to notify change in CPU capabilities in terms of performance and efficiency. Firmware may change CPU capabilities as a result of thermal events in the system or to account for changes in the TDP (thermal design power) level. This notification type will allow user space to avoid running workloads on certain CPUs or proactively adjust power limits to avoid future events. The netlink message consists of a nested attribute (THERMAL_GENL_ATTR_CPU_CAPABILITY) with three attributes: * THERMAL_GENL_ATTR_CPU_CAPABILITY_ID (type u32): -- logical CPU number * THERMAL_GENL_ATTR_CPU_CAPABILITY_PERFORMANCE (type u32): -- Scaled performance from 0-1023 * THERMAL_GENL_ATTR_CPU_CAPABILITY_EFFICIENCY (type u32): -- Scaled efficiency from 0-1023 Cc: Andi Kleen Cc: Aubrey Li Cc: Lukasz Luba Cc: Tim Chen Cc: "Ravi V. Shankar" Reviewed-by: Len Brown Signed-off-by: Srinivas Pandruvada --- Changes since v1: * Reworded commit message. * Reworded the members of struct cpu_capacity for clarity. (Lukasz) * Defined the CPU capability attributes to be scaled in the [0, 1023] interval. (Lukasz) --- drivers/thermal/thermal_netlink.c | 55 +++++++++++++++++++++++++++++++ drivers/thermal/thermal_netlink.h | 13 ++++++++ include/uapi/linux/thermal.h | 6 +++- 3 files changed, 73 insertions(+), 1 deletion(-) diff --git a/drivers/thermal/thermal_netlink.c b/drivers/thermal/thermal_netlink.c index a16dd4d5d710..38e6c20f460c 100644 --- a/drivers/thermal/thermal_netlink.c +++ b/drivers/thermal/thermal_netlink.c @@ -43,6 +43,11 @@ static const struct nla_policy thermal_genl_policy[THERMAL_GENL_ATTR_MAX + 1] = [THERMAL_GENL_ATTR_CDEV_MAX_STATE] = { .type = NLA_U32 }, [THERMAL_GENL_ATTR_CDEV_NAME] = { .type = NLA_STRING, .len = THERMAL_NAME_LENGTH }, + /* CPU capabilities */ + [THERMAL_GENL_ATTR_CPU_CAPABILITY] = { .type = NLA_NESTED }, + [THERMAL_GENL_ATTR_CPU_CAPABILITY_ID] = { .type = NLA_U32 }, + [THERMAL_GENL_ATTR_CPU_CAPABILITY_PERFORMANCE] = { .type = NLA_U32 }, + [THERMAL_GENL_ATTR_CPU_CAPABILITY_EFFICIENCY] = { .type = NLA_U32 }, }; struct param { @@ -58,6 +63,8 @@ struct param { int temp; int cdev_state; int cdev_max_state; + struct cpu_capability *cpu_capabilities; + int cpu_capabilities_count; }; typedef int (*cb_t)(struct param *); @@ -190,6 +197,45 @@ static int thermal_genl_event_gov_change(struct param *p) return 0; } +static int thermal_genl_event_cpu_capability_change(struct param *p) +{ + struct cpu_capability *cpu_cap = p->cpu_capabilities; + struct sk_buff *msg = p->msg; + struct nlattr *start_cap; + int i, ret; + + start_cap = nla_nest_start(msg, THERMAL_GENL_ATTR_CPU_CAPABILITY); + if (!start_cap) + return -EMSGSIZE; + + for (i = 0; i < p->cpu_capabilities_count; ++i) { + if (nla_put_u32(msg, THERMAL_GENL_ATTR_CPU_CAPABILITY_ID, + cpu_cap->cpu)) { + ret = -EMSGSIZE; + goto out_cancel_nest; + } + if (nla_put_u32(msg, THERMAL_GENL_ATTR_CPU_CAPABILITY_PERFORMANCE, + cpu_cap->performance)) { + ret = -EMSGSIZE; + goto out_cancel_nest; + } + if (nla_put_u32(msg, THERMAL_GENL_ATTR_CPU_CAPABILITY_EFFICIENCY, + cpu_cap->efficiency)) { + ret = -EMSGSIZE; + goto out_cancel_nest; + } + ++cpu_cap; + } + + nla_nest_end(msg, start_cap); + + return 0; +out_cancel_nest: + nla_nest_cancel(msg, start_cap); + + return ret; +} + int thermal_genl_event_tz_delete(struct param *p) __attribute__((alias("thermal_genl_event_tz"))); @@ -219,6 +265,7 @@ static cb_t event_cb[] = { [THERMAL_GENL_EVENT_CDEV_DELETE] = thermal_genl_event_cdev_delete, [THERMAL_GENL_EVENT_CDEV_STATE_UPDATE] = thermal_genl_event_cdev_state_update, [THERMAL_GENL_EVENT_TZ_GOV_CHANGE] = thermal_genl_event_gov_change, + [THERMAL_GENL_EVENT_CPU_CAPABILITY_CHANGE] = thermal_genl_event_cpu_capability_change, }; /* @@ -356,6 +403,14 @@ int thermal_notify_tz_gov_change(int tz_id, const char *name) return thermal_genl_send_event(THERMAL_GENL_EVENT_TZ_GOV_CHANGE, &p); } +int thermal_genl_cpu_capability_event(int count, struct cpu_capability *caps) +{ + struct param p = { .cpu_capabilities_count = count, .cpu_capabilities = caps }; + + return thermal_genl_send_event(THERMAL_GENL_EVENT_CPU_CAPABILITY_CHANGE, &p); +} +EXPORT_SYMBOL_GPL(thermal_genl_cpu_capability_event); + /*************************** Command encoding ********************************/ static int __thermal_genl_cmd_tz_get_id(struct thermal_zone_device *tz, diff --git a/drivers/thermal/thermal_netlink.h b/drivers/thermal/thermal_netlink.h index e554f76291f4..44bc3dec5568 100644 --- a/drivers/thermal/thermal_netlink.h +++ b/drivers/thermal/thermal_netlink.h @@ -4,6 +4,12 @@ * Author: Daniel Lezcano */ +struct cpu_capability { + int cpu; + int performance; + int efficiency; +}; + /* Netlink notification function */ #ifdef CONFIG_THERMAL_NETLINK int __init thermal_netlink_init(void); @@ -23,6 +29,7 @@ int thermal_notify_cdev_add(int cdev_id, const char *name, int max_state); int thermal_notify_cdev_delete(int cdev_id); int thermal_notify_tz_gov_change(int tz_id, const char *name); int thermal_genl_sampling_temp(int id, int temp); +int thermal_genl_cpu_capability_event(int count, struct cpu_capability *caps); #else static inline int thermal_netlink_init(void) { @@ -101,4 +108,10 @@ static inline int thermal_genl_sampling_temp(int id, int temp) { return 0; } + +static inline int thermal_genl_cpu_capability_event(int count, struct cpu_capability *caps) +{ + return 0; +} + #endif /* CONFIG_THERMAL_NETLINK */ diff --git a/include/uapi/linux/thermal.h b/include/uapi/linux/thermal.h index 9aa2fedfa309..fc78bf3aead7 100644 --- a/include/uapi/linux/thermal.h +++ b/include/uapi/linux/thermal.h @@ -44,7 +44,10 @@ enum thermal_genl_attr { THERMAL_GENL_ATTR_CDEV_MAX_STATE, THERMAL_GENL_ATTR_CDEV_NAME, THERMAL_GENL_ATTR_GOV_NAME, - + THERMAL_GENL_ATTR_CPU_CAPABILITY, + THERMAL_GENL_ATTR_CPU_CAPABILITY_ID, + THERMAL_GENL_ATTR_CPU_CAPABILITY_PERFORMANCE, + THERMAL_GENL_ATTR_CPU_CAPABILITY_EFFICIENCY, __THERMAL_GENL_ATTR_MAX, }; #define THERMAL_GENL_ATTR_MAX (__THERMAL_GENL_ATTR_MAX - 1) @@ -71,6 +74,7 @@ enum thermal_genl_event { THERMAL_GENL_EVENT_CDEV_DELETE, /* Cdev unbound */ THERMAL_GENL_EVENT_CDEV_STATE_UPDATE, /* Cdev state updated */ THERMAL_GENL_EVENT_TZ_GOV_CHANGE, /* Governor policy changed */ + THERMAL_GENL_EVENT_CPU_CAPABILITY_CHANGE, /* CPU capability changed */ __THERMAL_GENL_EVENT_MAX, }; #define THERMAL_GENL_EVENT_MAX (__THERMAL_GENL_EVENT_MAX - 1)