From patchwork Sun Feb 17 03:54:14 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xiongfeng Wang X-Patchwork-Id: 10816777 X-Patchwork-Delegate: rjw@sisk.pl Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 42F6C14E1 for ; Sun, 17 Feb 2019 03:55:22 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 220252922E for ; Sun, 17 Feb 2019 03:55:22 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0CEA32AB66; Sun, 17 Feb 2019 03:55:22 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C8C572922E for ; Sun, 17 Feb 2019 03:55:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727814AbfBQDzS (ORCPT ); Sat, 16 Feb 2019 22:55:18 -0500 Received: from szxga05-in.huawei.com ([45.249.212.191]:3752 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725794AbfBQDzS (ORCPT ); Sat, 16 Feb 2019 22:55:18 -0500 Received: from DGGEMS408-HUB.china.huawei.com (unknown [172.30.72.59]) by Forcepoint Email with ESMTP id 88BBEA1ECEB5ABB27A92; Sun, 17 Feb 2019 11:55:15 +0800 (CST) Received: from linux-ibm.site (10.175.102.37) by DGGEMS408-HUB.china.huawei.com (10.3.19.208) with Microsoft SMTP Server id 14.3.408.0; Sun, 17 Feb 2019 11:55:07 +0800 From: Xiongfeng Wang To: , , , , , CC: , , , , Subject: [PATCH v3 1/2] ACPI / CPPC: Add a helper to get desired performance Date: Sun, 17 Feb 2019 11:54:14 +0800 Message-ID: <1550375655-58007-2-git-send-email-wangxiongfeng2@huawei.com> X-Mailer: git-send-email 1.7.12.4 In-Reply-To: <1550375655-58007-1-git-send-email-wangxiongfeng2@huawei.com> References: <1550375655-58007-1-git-send-email-wangxiongfeng2@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.102.37] X-CFilter-Loop: Reflected Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch add a helper to get the value of desired performance register. Signed-off-by: Xiongfeng Wang --- drivers/acpi/cppc_acpi.c | 39 +++++++++++++++++++++++++++++++++++++++ include/acpi/cppc_acpi.h | 1 + 2 files changed, 40 insertions(+) diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c index 217a782..231d447 100644 --- a/drivers/acpi/cppc_acpi.c +++ b/drivers/acpi/cppc_acpi.c @@ -1051,6 +1051,45 @@ static int cpc_write(int cpu, struct cpc_register_resource *reg_res, u64 val) } /** + * cppc_get_desired_perf - Get the value of desired performance register. + * @cpunum: CPU from which to get desired performance. + * @desired_perf: address of a variable to store the returned desired performance + * + * Return: 0 for success, -EIO otherwise. + */ +int cppc_get_desired_perf(int cpunum, u64 *desired_perf) +{ + struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpunum); + int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpunum); + struct cpc_register_resource *desired_reg; + struct cppc_pcc_data *pcc_ss_data = NULL; + + desired_reg = &cpc_desc->cpc_regs[DESIRED_PERF]; + + if (CPC_IN_PCC(desired_reg)) { + int ret = 0; + + if (pcc_ss_id < 0) + return -EIO; + pcc_ss_data = pcc_data[pcc_ss_id]; + + down_write(&pcc_ss_data->pcc_lock); + if (send_pcc_cmd(pcc_ss_id, CMD_READ) >= 0) + cpc_read(cpunum, desired_reg, desired_perf); + else + ret = -EIO; + up_write(&pcc_ss_data->pcc_lock); + + return ret; + } + + cpc_read(cpunum, desired_reg, desired_perf); + + return 0; +} +EXPORT_SYMBOL_GPL(cppc_get_desired_perf); + +/** * cppc_get_perf_caps - Get a CPUs performance capabilities. * @cpunum: CPU from which to get capabilities info. * @perf_caps: ptr to cppc_perf_caps. See cppc_acpi.h diff --git a/include/acpi/cppc_acpi.h b/include/acpi/cppc_acpi.h index 4f34734..ba6fd72 100644 --- a/include/acpi/cppc_acpi.h +++ b/include/acpi/cppc_acpi.h @@ -137,6 +137,7 @@ struct cppc_cpudata { cpumask_var_t shared_cpu_map; }; +extern int cppc_get_desired_perf(int cpunum, u64 *desired_perf); extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs); extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls); extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps);