From mboxrd@z Thu Jan 1 00:00:00 1970 From: Prashanth Prakash Subject: [PATCH V2 1/2] ACPI / CPPC: Read lowest non linear perf in cppc_get_perf_caps Date: Wed, 29 Mar 2017 13:49:59 -0600 Message-ID: <1490817000-13876-2-git-send-email-pprakash@codeaurora.org> References: <1490817000-13876-1-git-send-email-pprakash@codeaurora.org> Return-path: Received: from smtp.codeaurora.org ([198.145.29.96]:46780 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753160AbdC2TuU (ORCPT ); Wed, 29 Mar 2017 15:50:20 -0400 In-Reply-To: <1490817000-13876-1-git-send-email-pprakash@codeaurora.org> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: linux-acpi@vger.kernel.org Cc: rjw@rjwysocki.net, hotran@apm.com, ahs3@redhat.com, Prashanth Prakash Read lowest non linear perf in cppc_get_perf_caps so that it can be exposed via sysfs to the usespace. Lowest non linear perf is the lowest performance level at which nonlinear power savings are achieved. Signed-off-by: Prashanth Prakash --- drivers/acpi/cppc_acpi.c | 19 +++++++++++-------- include/acpi/cppc_acpi.h | 1 + 2 files changed, 12 insertions(+), 8 deletions(-) diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c index 3ca0729..f5f3c29 100644 --- a/drivers/acpi/cppc_acpi.c +++ b/drivers/acpi/cppc_acpi.c @@ -972,9 +972,9 @@ static int cpc_write(int cpu, struct cpc_register_resource *reg_res, u64 val) int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps) { struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpunum); - struct cpc_register_resource *highest_reg, *lowest_reg, *ref_perf, - *nom_perf; - u64 high, low, nom; + struct cpc_register_resource *highest_reg, *lowest_reg, + *lowest_non_linear_reg, *nominal_reg; + u64 high, low, nom, low_non_linear; int ret = 0, regs_in_pcc = 0; if (!cpc_desc) { @@ -984,12 +984,12 @@ int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps) highest_reg = &cpc_desc->cpc_regs[HIGHEST_PERF]; lowest_reg = &cpc_desc->cpc_regs[LOWEST_PERF]; - ref_perf = &cpc_desc->cpc_regs[REFERENCE_PERF]; - nom_perf = &cpc_desc->cpc_regs[NOMINAL_PERF]; + lowest_non_linear_reg = &cpc_desc->cpc_regs[LOW_NON_LINEAR_PERF]; + nominal_reg = &cpc_desc->cpc_regs[NOMINAL_PERF]; /* Are any of the regs PCC ?*/ if (CPC_IN_PCC(highest_reg) || CPC_IN_PCC(lowest_reg) || - CPC_IN_PCC(ref_perf) || CPC_IN_PCC(nom_perf)) { + CPC_IN_PCC(lowest_non_linear_reg) || CPC_IN_PCC(nominal_reg)) { regs_in_pcc = 1; down_write(&pcc_data.pcc_lock); /* Ring doorbell once to update PCC subspace */ @@ -1005,10 +1005,13 @@ int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps) cpc_read(cpunum, lowest_reg, &low); perf_caps->lowest_perf = low; - cpc_read(cpunum, nom_perf, &nom); + cpc_read(cpunum, nominal_reg, &nom); perf_caps->nominal_perf = nom; - if (!high || !low || !nom) + cpc_read(cpunum, lowest_non_linear_reg, &low_non_linear); + perf_caps->lowest_non_linear_perf = low_non_linear; + + if (!high || !low || !nom || !low_non_linear) ret = -EFAULT; out_err: diff --git a/include/acpi/cppc_acpi.h b/include/acpi/cppc_acpi.h index 427a7c3..3f64660 100644 --- a/include/acpi/cppc_acpi.h +++ b/include/acpi/cppc_acpi.h @@ -103,6 +103,7 @@ struct cppc_perf_caps { u32 highest_perf; u32 nominal_perf; u32 lowest_perf; + u32 lowest_non_linear_perf; }; struct cppc_perf_ctrls { -- Qualcomm Datacenter Technologies on behalf of Qualcomm Technologies, Inc. Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.