From patchwork Sat Feb 6 11:04:29 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chunyan Zhang X-Patchwork-Id: 8242401 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id AA56E9F38B for ; Sat, 6 Feb 2016 11:08:35 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id A3BC320260 for ; Sat, 6 Feb 2016 11:08:34 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 3778E2022D for ; Sat, 6 Feb 2016 11:08:33 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1aS0hd-0007ep-3F; Sat, 06 Feb 2016 11:06:57 +0000 Received: from mail-pa0-x235.google.com ([2607:f8b0:400e:c03::235]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1aS0hP-0007RY-LV for linux-arm-kernel@lists.infradead.org; Sat, 06 Feb 2016 11:06:46 +0000 Received: by mail-pa0-x235.google.com with SMTP id cy9so48038834pac.0 for ; Sat, 06 Feb 2016 03:06:23 -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=PQ1iw+prIeRtvWKJYutwr6GQ3xxlzHZwZ7r7R8fqefBuFi81s3EilD4BWX4ahyMkJK 1VeHfzb+1jjwPdKHslncYdNhHi050lX1BEhgxD3ELh5lo76369YvSr202iL2lbLmWqb9 VJ3pEXeNu45yIRnoHMRHo+PNjt7Hi7jFiir7iz9wKY3rwIAJ1NUPo0za0cXEHqrhSToR Ri9yCK2sBxCJ3bwErfz8AmQZopxMBpVUQkp4G6IlHGWNm0NCeSFo+V+nbV6FP0Bex079 DDuyqu7qNU1sBfjMnaVdgWouJAmd8QZigo+TLovnFBuOoX29r+ktISUArkvadNH4xJGf 7Igg== X-Gm-Message-State: AG10YORiznvXI9nWIqxByeXL3cz2N53ic/oFqqgCu4OQWp/zIAf2Buvt1O5/HI9avnKjJOXM 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 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> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160206_030643_951224_CF947453 X-CRM114-Status: GOOD ( 16.94 ) X-Spam-Score: -2.7 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, al.grant@arm.com, Michael.Williams@arm.com, corbet@lwn.net, zhang.lyra@gmail.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, tor@ti.com, broonie@kernel.org, mike.leach@arm.com, linux-api@vger.kernel.org, pratikp@codeaurora.org, nicolas.guion@st.com, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.5 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED,RP_MATCHES_RCVD,T_DKIM_INVALID,UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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(-) 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;