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[209.132.180.67]) by mx.google.com with ESMTP id p83si30774322pfj.121.2016.02.06.03.06.32; Sat, 06 Feb 2016 03:06:32 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dkim=pass header.i=@linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752418AbcBFLG1 (ORCPT + 30 others); Sat, 6 Feb 2016 06:06:27 -0500 Received: from mail-pa0-f51.google.com ([209.85.220.51]:36863 "EHLO mail-pa0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752353AbcBFLGX (ORCPT ); Sat, 6 Feb 2016 06:06:23 -0500 Received: by mail-pa0-f51.google.com with SMTP id yy13so47874692pab.3 for ; Sat, 06 Feb 2016 03:06:22 -0800 (PST) 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; bh=9Kb5VfUYqO/Uhj7XVlraNyCbbWdMtqEiI+FTyvuJnIE=; b=A97Z0RZHMzx7DS6BSiM3rWh0yS6wFXiKUruRnx9tPoHzm+Pj+wZDO23aEuX9YW0Q26 lpAZvSR2r/GJiNcxRQsjOcYUX/bq+aWxIeBRjYHmFLcyDbG9DUjlV40qTw49/TJEYMKk VTx/zsqXE++xPMCGQQytOay4uCkZ4EzLiegYg= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=9Kb5VfUYqO/Uhj7XVlraNyCbbWdMtqEiI+FTyvuJnIE=; b=Y92x99VBRaEjvFvjyqwIiSdEuqWbt2eQ6uwb63AykotuolIABldtfUocggvO3UxKsC qSpH9pO1/H4XMKC9m4GMPL2sBRKix8qEBxHA69eUfH2FuA/9iLpNpLDFAOncVj3n19d4 NBPrOZpz/WXBdzJFFGauJXl2JoUz+yidntxwsN+2FwSVCATni3u5yzFoEOScXo/yHWLP jBjIKP/dSN6bpL7QMxE6jmjWzUdu5NtO+vP3KHieoXqYRyhvtgzdCZ1F7kNso6EL7gwq mgVP7feye9U7pgif//ZJipBRpKWT/PZVzl0k0UNlS/CoxMCIC8/fIBsxJUnz49J55tSj K9mQ== X-Gm-Message-State: AG10YOQykLxwdG/ORSsPZ6sVMDcFXuFtYTDxpMHlqt7iC651D4SMCKyAuUvmzZrmwfGwnyuF X-Received: by 10.66.193.195 with SMTP id hq3mr27077058pac.38.1454756782637; Sat, 06 Feb 2016 03:06:22 -0800 (PST) Received: from zcy-ubuntu.spreadtrum.com ([175.111.195.49]) by smtp.gmail.com with ESMTPSA id p21sm30500690pfj.67.2016.02.06.03.06.16 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Sat, 06 Feb 2016 03:06:21 -0800 (PST) From: Chunyan Zhang To: mathieu.poirier@linaro.org, alexander.shishkin@linux.intel.com Cc: mike.leach@arm.com, Michael.Williams@arm.com, al.grant@arm.com, tor@ti.com, nicolas.guion@st.com, broonie@kernel.org, robh@kernel.org, pratikp@codeaurora.org, corbet@lwn.net, mark.rutland@arm.com, zhang.lyra@gmail.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-api@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH V3 3/6] stm class: provision for statically assigned masterIDs Date: Sat, 6 Feb 2016 19:04:29 +0800 Message-Id: <1454756672-12790-4-git-send-email-zhang.chunyan@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1454756672-12790-1-git-send-email-zhang.chunyan@linaro.org> References: <1454756672-12790-1-git-send-email-zhang.chunyan@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mathieu Poirier Some architecture like ARM assign masterIDs statically at the HW design phase, making masterID manipulation in the generic STM core irrelevant. This patch adds a new 'mstatic' flag to struct stm_data that tells the core that this specific STM device doesn't need explicit masterID management. In the core sw_start/end of masterID are set to '1', i.e there is only one masterID to deal with. Also this patch depends on [1], so that the number of masterID is '1' too. Finally the lower and upper bound for masterIDs as presented in ($SYSFS)/class/stm/XYZ.stm/masters and ($SYSFS)/../stp-policy/XYZ.stm.my_policy/some_device/masters are set to '-1'. That way users can't confuse them with architecture where masterID management is required (where any other value would be valid). [1] https://lkml.org/lkml/2015/12/22/348 Signed-off-by: Mathieu Poirier Signed-off-by: Chunyan Zhang --- drivers/hwtracing/stm/core.c | 18 ++++++++++++++++-- drivers/hwtracing/stm/policy.c | 18 ++++++++++++++++-- include/linux/stm.h | 8 ++++++++ 3 files changed, 40 insertions(+), 4 deletions(-) -- 1.9.1 diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c index 854a16d..d344ae7 100644 --- a/drivers/hwtracing/stm/core.c +++ b/drivers/hwtracing/stm/core.c @@ -44,9 +44,15 @@ static ssize_t masters_show(struct device *dev, char *buf) { struct stm_device *stm = to_stm_device(dev); - int ret; + int ret, sw_start, sw_end; + + sw_start = stm->data->sw_start; + sw_end = stm->data->sw_end; - ret = sprintf(buf, "%u %u\n", stm->data->sw_start, stm->data->sw_end); + if (stm->data->mstatic) + sw_start = sw_end = STM_STATIC_MASTERID; + + ret = sprintf(buf, "%d %d\n", sw_start, sw_end); return ret; } @@ -630,7 +636,15 @@ int stm_register_device(struct device *parent, struct stm_data *stm_data, if (!stm_data->packet || !stm_data->sw_nchannels) return -EINVAL; + /* + * MasterIDs are statically set in HW. As such the core is + * using a single master for interaction with this device. + */ + if (stm_data->mstatic) + stm_data->sw_start = stm_data->sw_end = 1; + nmasters = stm_data->sw_end - stm_data->sw_start; + stm = kzalloc(sizeof(*stm) + nmasters * sizeof(void *), GFP_KERNEL); if (!stm) return -ENOMEM; diff --git a/drivers/hwtracing/stm/policy.c b/drivers/hwtracing/stm/policy.c index 17a1416..c874dea 100644 --- a/drivers/hwtracing/stm/policy.c +++ b/drivers/hwtracing/stm/policy.c @@ -80,10 +80,17 @@ static ssize_t stp_policy_node_masters_show(struct config_item *item, char *page) { struct stp_policy_node *policy_node = to_stp_policy_node(item); + struct stm_device *stm = policy_node->policy->stm; + int first_master, last_master; ssize_t count; - count = sprintf(page, "%u %u\n", policy_node->first_master, - policy_node->last_master); + first_master = policy_node->first_master; + last_master = policy_node->last_master; + + if (stm && stm->data->mstatic) + first_master = last_master = STM_STATIC_MASTERID; + + count = sprintf(page, "%d %d\n", first_master, last_master); return count; } @@ -106,6 +113,13 @@ stp_policy_node_masters_store(struct config_item *item, const char *page, if (!stm) goto unlock; + /* + * masterIDs are statically allocated in HW, no point in trying to + * change their values. + */ + if (stm->data->mstatic) + goto unlock; + /* must be within [sw_start..sw_end], which is an inclusive range */ if (first > INT_MAX || last > INT_MAX || first > last || first < stm->data->sw_start || diff --git a/include/linux/stm.h b/include/linux/stm.h index f351d62..c9712a7 100644 --- a/include/linux/stm.h +++ b/include/linux/stm.h @@ -18,6 +18,11 @@ #include /** + * The masterIDs are statically set in hardware and can't be queried + */ +#define STM_STATIC_MASTERID -1 + +/** * enum stp_packet_type - STP packets that an STM driver sends */ enum stp_packet_type { @@ -46,6 +51,8 @@ struct stm_device; * struct stm_data - STM device description and callbacks * @name: device name * @stm: internal structure, only used by stm class code + * @mstatic: true if masterIDs are assigned in HW. If so @sw_start + * and @sw_end are set to '1' by the core. * @sw_start: first STP master available to software * @sw_end: last STP master available to software * @sw_nchannels: number of STP channels per master @@ -71,6 +78,7 @@ struct stm_device; struct stm_data { const char *name; struct stm_device *stm; + bool mstatic; unsigned int sw_start; unsigned int sw_end; unsigned int sw_nchannels;