From patchwork Wed Jul 22 11:01:38 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Georgi Djakov X-Patchwork-Id: 11678223 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 683EB913 for ; Wed, 22 Jul 2020 11:01:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4D99A206F5 for ; Wed, 22 Jul 2020 11:01:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="N60bJeq9" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730061AbgGVLBo (ORCPT ); Wed, 22 Jul 2020 07:01:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47704 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729037AbgGVLBn (ORCPT ); Wed, 22 Jul 2020 07:01:43 -0400 Received: from mail-wr1-x443.google.com (mail-wr1-x443.google.com [IPv6:2a00:1450:4864:20::443]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BEAFDC0619DF for ; Wed, 22 Jul 2020 04:01:42 -0700 (PDT) Received: by mail-wr1-x443.google.com with SMTP id s10so1445903wrw.12 for ; Wed, 22 Jul 2020 04:01:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=Mb4TDwngKstdYsXu7RUzjZ9eyxkXyxQaDZSnxs4t1+Y=; b=N60bJeq90gF41M58w7DHRMQvF6qMoRnkCpkk5WCEHbDJW0aHQ6I4402GfkkTroitnv DxGEB6UcyEovmUTMewJhlshvkGdmcaqwzbcqdfA9nxgw8Spu298DxnjSikpWRXypTvC8 dQSOOG0oVp3kRk+4vQZBFRagUdUm0V8zL5nCuMACDngI5NldIASAtY9m3s+pDNjYVNEZ Ga8vzcgGqEaScwPGpp2H60wF2eh+4Q9q9UsO3QEH84g81YpAwV7+Ti9bty7qsYWIdfSA uYRKddOBJ/AArr/opFW0AMFu8JnJf8jQZLjQoYGrQLEdLYE7a2pVrXYOpPbKi3sQdRLd RSNA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=Mb4TDwngKstdYsXu7RUzjZ9eyxkXyxQaDZSnxs4t1+Y=; b=rmgaS3Pt8Wx1rtQNpkVmXxjAeyHlOxE68ijPPdWaiuIDR2bMY8ewz4O3da/zDJY3vu cfwJnXO97kn+hMdCpHsN6D++ujRDVYXdWCIgaFL6xUHtDurEesl8LurBWp0EgUNvinzM kql8188abYbQ8X+K6RkshtsY5yp9CZf69xJgqHe08VHMl29RY62I0D1uRCqHNy7EamXb b7CAZwaaDoibj3VVmL+QaybKhuk/layhtelLnMIMpO3daDFjp98w61UM0eNr5S0TBsGY pB9EzoRBC6yN8u8ShtGK+nQAlSMxEAsVGaFeYfKdaxm4hHLHFEtOzyFFGylWsOZNzzcX H5Jg== X-Gm-Message-State: AOAM531NdetsTyO3TfYXeGlr0x6mcFQWNfng1eYa0avZN5Zanbo1XzR2 j6Lq4tlptpm7KAv7PMGYGv5/+JXEBso= X-Google-Smtp-Source: ABdhPJyVFEACUDVgyJ7BwW37Wm8jOezlYQOmluktE5flWxq8GlmeRLwB1J95+gBWQAjMSub6hpTORA== X-Received: by 2002:adf:cd8b:: with SMTP id q11mr22330993wrj.98.1595415701114; Wed, 22 Jul 2020 04:01:41 -0700 (PDT) Received: from localhost.localdomain ([212.45.67.2]) by smtp.googlemail.com with ESMTPSA id y6sm41256164wrr.74.2020.07.22.04.01.39 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 22 Jul 2020 04:01:40 -0700 (PDT) From: Georgi Djakov To: linux-pm@vger.kernel.org Cc: saravanak@google.com, mdtipton@codeaurora.org, okukatla@codeaurora.org, bjorn.andersson@linaro.org, vincent.guittot@linaro.org, georgi.djakov@linaro.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/2] interconnect: Add sync state support Date: Wed, 22 Jul 2020 14:01:38 +0300 Message-Id: <20200722110139.24778-2-georgi.djakov@linaro.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200722110139.24778-1-georgi.djakov@linaro.org> References: <20200722110139.24778-1-georgi.djakov@linaro.org> MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org The bootloaders often do some initial configuration of the interconnects in the system and we want to keep this configuration until all consumers have probed and expressed their bandwidth needs. This is because we don't want to change the configuration by starting to disable unused paths until every user had a chance to request the amount of bandwidth it needs. To accomplish this we will implement an interconnect specific sync_state callback which will synchronize (aggregate and set) the current bandwidth settings when all consumers have been probed. Signed-off-by: Georgi Djakov --- drivers/interconnect/core.c | 61 +++++++++++++++++++++++++++ include/linux/interconnect-provider.h | 5 +++ 2 files changed, 66 insertions(+) diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c index e5f998744501..0c4e38d9f1fa 100644 --- a/drivers/interconnect/core.c +++ b/drivers/interconnect/core.c @@ -26,6 +26,8 @@ static DEFINE_IDR(icc_idr); static LIST_HEAD(icc_providers); +static int providers_count; +static bool synced_state; static DEFINE_MUTEX(icc_lock); static struct dentry *icc_debugfs_dir; @@ -255,6 +257,12 @@ static int aggregate_requests(struct icc_node *node) continue; p->aggregate(node, r->tag, r->avg_bw, r->peak_bw, &node->avg_bw, &node->peak_bw); + + /* during boot use the initial bandwidth as a floor value */ + if (!synced_state) { + node->avg_bw = max(node->avg_bw, node->init_avg); + node->peak_bw = max(node->peak_bw, node->init_peak); + } } return 0; @@ -919,6 +927,13 @@ void icc_node_add(struct icc_node *node, struct icc_provider *provider) node->provider = provider; list_add_tail(&node->node_list, &provider->nodes); + /* get the initial bandwidth values and sync them with hardware */ + if ((node->init_avg || node->init_peak) && provider->set) { + node->avg_bw = node->init_avg; + node->peak_bw = node->init_peak; + provider->set(node, node); + } + mutex_unlock(&icc_lock); } EXPORT_SYMBOL_GPL(icc_node_add); @@ -1014,8 +1029,54 @@ int icc_provider_del(struct icc_provider *provider) } EXPORT_SYMBOL_GPL(icc_provider_del); +static int of_count_icc_providers(struct device_node *np) +{ + struct device_node *child; + int count = 0; + + for_each_available_child_of_node(np, child) { + if (of_property_read_bool(child, "#interconnect-cells")) + count++; + count += of_count_icc_providers(child); + } + of_node_put(np); + + return count; +} + +void icc_sync_state(struct device *dev) +{ + struct icc_provider *p; + struct icc_node *n; + static int count; + + count++; + + if (count < providers_count) + return; + + mutex_lock(&icc_lock); + synced_state = true; + list_for_each_entry(p, &icc_providers, provider_list) { + dev_dbg(p->dev, "interconnect provider is in synced state\n"); + list_for_each_entry(n, &p->nodes, node_list) { + if (n->init_avg || n->init_peak) { + aggregate_requests(n); + p->set(n, n); + } + } + } + mutex_unlock(&icc_lock); +} +EXPORT_SYMBOL_GPL(icc_sync_state); + static int __init icc_init(void) { + struct device_node *root = of_find_node_by_path("/"); + + providers_count = of_count_icc_providers(root); + of_node_put(root); + icc_debugfs_dir = debugfs_create_dir("interconnect", NULL); debugfs_create_file("interconnect_summary", 0444, icc_debugfs_dir, NULL, &icc_summary_fops); diff --git a/include/linux/interconnect-provider.h b/include/linux/interconnect-provider.h index 0c494534b4d3..aa85b96296c4 100644 --- a/include/linux/interconnect-provider.h +++ b/include/linux/interconnect-provider.h @@ -71,6 +71,8 @@ struct icc_provider { * @req_list: a list of QoS constraint requests associated with this node * @avg_bw: aggregated value of average bandwidth requests from all consumers * @peak_bw: aggregated value of peak bandwidth requests from all consumers + * @init_avg: average bandwidth value that is read from the hardware during init + * @init_peak: peak bandwidth value that is read from the hardware during init * @data: pointer to private data */ struct icc_node { @@ -87,6 +89,8 @@ struct icc_node { struct hlist_head req_list; u32 avg_bw; u32 peak_bw; + u32 init_avg; + u32 init_peak; void *data; }; @@ -103,6 +107,7 @@ void icc_node_del(struct icc_node *node); int icc_nodes_remove(struct icc_provider *provider); int icc_provider_add(struct icc_provider *provider); int icc_provider_del(struct icc_provider *provider); +void icc_sync_state(struct device *dev); #else