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 X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 09811C43381 for ; Thu, 14 Feb 2019 07:47:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D83B2222A4 for ; Thu, 14 Feb 2019 07:46:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2437345AbfBNHq6 (ORCPT ); Thu, 14 Feb 2019 02:46:58 -0500 Received: from szxga06-in.huawei.com ([45.249.212.32]:44878 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2437330AbfBNHq5 (ORCPT ); Thu, 14 Feb 2019 02:46:57 -0500 Received: from DGGEMS406-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id 459F262CF30613A63F0B; Thu, 14 Feb 2019 15:46:54 +0800 (CST) Received: from linux-ibm.site (10.175.102.37) by DGGEMS406-HUB.china.huawei.com (10.3.19.206) with Microsoft SMTP Server id 14.3.408.0; Thu, 14 Feb 2019 15:46:45 +0800 From: Xiongfeng Wang To: , , , , , CC: , , , , Subject: [PATCH v2 1/2] ACPI / CPPC: Add a helper to get desired performance Date: Thu, 14 Feb 2019 15:46:07 +0800 Message-ID: <1550130368-60513-2-git-send-email-wangxiongfeng2@huawei.com> X-Mailer: git-send-email 1.7.12.4 In-Reply-To: <1550130368-60513-1-git-send-email-wangxiongfeng2@huawei.com> References: <1550130368-60513-1-git-send-email-wangxiongfeng2@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.175.102.37] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch add a helper to get the value of desired performance register. Signed-off-by: Xiongfeng Wang --- drivers/acpi/cppc_acpi.c | 38 ++++++++++++++++++++++++++++++++++++++ include/acpi/cppc_acpi.h | 1 + 2 files changed, 39 insertions(+) diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c index 217a782..93588c5 100644 --- a/drivers/acpi/cppc_acpi.c +++ b/drivers/acpi/cppc_acpi.c @@ -1051,6 +1051,44 @@ 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; + int regs_in_pcc = 0; + + desired_reg = &cpc_desc->cpc_regs[DESIRED_PERF]; + + if (CPC_IN_PCC(desired_reg)) { + if (pcc_ss_id < 0) + return -EIO; + pcc_ss_data = pcc_data[pcc_ss_id]; + down_write(&pcc_ss_data->pcc_lock); + regs_in_pcc = 1; + if (send_pcc_cmd(pcc_ss_id, CMD_READ) < 0) { + up_write(&pcc_ss_data->pcc_lock); + return -EIO; + } + } + + cpc_read(cpunum, desired_reg, desired_perf); + + if (regs_in_pcc) + up_write(&pcc_ss_data->pcc_lock); + + 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); -- 1.7.12.4