From patchwork Mon Feb 1 07:58:46 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chunyan Zhang X-Patchwork-Id: 60867 Delivered-To: patch@linaro.org Received: by 10.112.130.2 with SMTP id oa2csp2868322lbb; Mon, 1 Feb 2016 00:00:18 -0800 (PST) X-Received: by 10.66.149.7 with SMTP id tw7mr36513977pab.72.1454313618775; Mon, 01 Feb 2016 00:00:18 -0800 (PST) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id ly9si22653930pab.115.2016.02.01.00.00.18; Mon, 01 Feb 2016 00:00:18 -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 S1751647AbcBAIAN (ORCPT + 30 others); Mon, 1 Feb 2016 03:00:13 -0500 Received: from mail-pa0-f50.google.com ([209.85.220.50]:34178 "EHLO mail-pa0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751587AbcBAIAI (ORCPT ); Mon, 1 Feb 2016 03:00:08 -0500 Received: by mail-pa0-f50.google.com with SMTP id uo6so79227766pac.1 for ; Mon, 01 Feb 2016 00:00:08 -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=RVkTCnZ688QUfxFMdFD0F41mCMymwYIkGyivKScYM+k=; b=U+R+dKkWOj83Ix15mS//IvS9gD1MtaEL3jsNaSRDDbJGGNque207HYdOcGAEfhJtWZ qtBPru9/fQKkrIKYBCFNgKTAPUbC1tjG4dBkv9zJSlizBwJkPms2PTXtQBoswMNkpwIt FaP4BLbvQjlYL7lw2Ts10daqw9L+2vbFrxLdU= 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=RVkTCnZ688QUfxFMdFD0F41mCMymwYIkGyivKScYM+k=; b=J5bFcJeQnURHfIXAKa01g4qjpb4hKGqXWDcmMQ6WAurBg6N0tVRN4S+QBnn9Y+ma0+ uM7HmP6w6alqnDq5Qk/xxixyAHbBMnEnahOxkTX/ylwQZVn5JQJfaqEdY8K9Gyyn+HKH ySPWSNMYftmOx5fLhmmr0icnnbH+2sKWzojNz3eukZ0jJ3pBu3c11SzIIfnOqm5r3Xi7 qX3R9eXh2mzgPmqh5qMGSwmRe36RupSWpKTE9xJdhaSOu8ou/HYvl6pIZ+PPX/NgHD9Y 1RyYuTrkS7M2DUrByPyJzwy/wFVjzG3oajlwrn3RemEREENf5CYGNq2zJsNEzkFJrwEu C1cg== X-Gm-Message-State: AG10YOTpetezkRNJMNuiaHqBZ5kRl5ykhy48r7MFojFyIIT0GPbzyCbxfM7pKK7MQPC2Ersn X-Received: by 10.66.236.129 with SMTP id uu1mr36174855pac.158.1454313607754; Mon, 01 Feb 2016 00:00:07 -0800 (PST) Received: from zcy-ubuntu.spreadtrum.com ([175.111.195.49]) by smtp.gmail.com with ESMTPSA id o4sm40799282pfa.85.2016.02.01.00.00.02 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 01 Feb 2016 00:00:06 -0800 (PST) From: Chunyan Zhang To: mathieu.poirier@linaro.org, alexander.shishkin@linux.intel.com Cc: robh@kernel.org, broonie@kernel.org, pratikp@codeaurora.org, nicolas.guion@st.com, 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.orgi, linux-doc@vger.kernel.org Subject: [PATCH 3/6] stm class: provision for statically assigned masterIDs Date: Mon, 1 Feb 2016 15:58:46 +0800 Message-Id: <1454313529-8860-4-git-send-email-zhang.chunyan@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1454313529-8860-1-git-send-email-zhang.chunyan@linaro.org> References: <1454313529-8860-1-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 | 19 +++++++++++++++++-- include/linux/stm.h | 8 ++++++++ 3 files changed, 41 insertions(+), 4 deletions(-) -- 1.9.1 diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c index 86bb4e3..cd3dc19 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; } @@ -629,7 +635,15 @@ 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 691686e..7e70ca2 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 || @@ -325,6 +339,7 @@ stp_policies_make(struct config_group *group, const char *name) * number of dot(s) are found in the , the * first matched STM device name would be extracted. */ + for (p = devname; ; p++) { p = strchr(p, '.'); if (!p) { 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;