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Fri, 3 Jul 2020 09:56:57 +0000 (GMT) From: Chanwoo Choi To: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: leonard.crestez@nxp.com, lukasz.luba@arm.com, enric.balletbo@collabora.com, hl@rock-chips.com, digetx@gmail.com, thierry.reding@gmail.com, jonathanh@nvidia.com, abel.vesa@nxp.com, cw00.choi@samsung.com, chanwoo@kernel.org, myungjoo.ham@samsung.com, kyungmin.park@samsung.com Subject: [PATCH 1/2] PM / devfreq: Clean up the devfreq instance name in sysfs attr Date: Fri, 3 Jul 2020 19:08:09 +0900 Message-Id: <20200703100810.12304-2-cw00.choi@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200703100810.12304-1-cw00.choi@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprMJsWRmVeSWpSXmKPExsWy7bCmnu4rhv9xBt9e8lksu3SU0WLijSss Fte/PGe1WP3xMaPFmtuHGC1+bDjFbNEyaxGLxdmmN+wWK+5+ZLW4vGsOm8Xn3iOMFgubWtgt bjeuYLP4uWseiwOfx5p5axg9dtxdwuixc9Zddo9NqzrZPHqb37F5bHy3g8nj76z9LB59W1Yx enzeJBfAGZVtk5GamJJapJCal5yfkpmXbqvkHRzvHG9qZmCoa2hpYa6kkJeYm2qr5OIToOuW mQN0vZJCWWJOKVAoILG4WEnfzqYov7QkVSEjv7jEVim1ICWnwLJArzgxt7g0L10vOT/XytDA wMgUqDAhO2P70jMsBT36Fd93X2ZsYJyj1sXIwSEhYCLx8kpcFyMXh5DADkaJlW9mskE4n4Cc g3+ZIJxvjBIn7nxk7GLkBOu4032PFSKxF6hqzXyoli+MEsv6tjGDVLEJaEnsf3GDDcQWEbCS OP2/gxmkiFlgHpPE4tNXWUCWCwuESrxapA5SwyKgKvFi5Td2EJsXqH7joyPsENvkJVZvOAA2 k1PAWmLL5smMIHMkBOZySDxrWcIMUeQicfrYESYIW1ji1fEtUM1SEp/f7WWDsKslVp48wgbR 3MEosWX/BVaIhLHE/qWTmUAOYhbQlFi/Sx8irCix8/dcsJeZBfgk3n3tYYUEGK9ER5sQRImy xOUHd6HWSkosbu9kgyjxkPi5NwQSJn2MEj/3XGOewCg3C2HBAkbGVYxiqQXFuempxYYFpsgx tokRnDq1LHcwTn/7Qe8QIxMH4yFGCQ5mJRHeBNV/cUK8KYmVValF+fFFpTmpxYcYTYGBN5FZ SjQ5H5i880riDU2NjI2NLUwMzUwNDZXEeZ2sL8QJCaQnlqRmp6YWpBbB9DFxcEo1MBXMOT99 Ptfmnw9YKoXCD2prFjfbbY2+lCYj0jChpDZB6oltv3PhmecTl/jzPz0/qSbwn791YPHh1uV7 z0v1/ii7e3DplblXYw7bfJ1m5nfs0SstEb1V4kcX+3o8SfOI3+mt15YswHqyfPkLpqNLvofJ hZRc+un4eG36tCWJ3DqfFwXU3Fpk2/lr6d/qwqB/S5ykJ6vOsL3Fd8ve3PL1AbuimOQPcafP cdQsla/93nh36USpMI8pb6US9039eM3qjMHpwq0zp8rmsEopCp3sPz+xTCLD5fxPWc0Tmg3v 1StO/bgtosean+/gzvt3/Qaplnph421Lg7y/qTZMeTFTwfTQinV1IiaCyTLzr17ZuEKJpTgj 0VCLuag4EQAoc309JgQAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrHLMWRmVeSWpSXmKPExsWy7bCSnO5Lhv9xBrcOqFssu3SU0WLijSss Fte/PGe1WP3xMaPFmtuHGC1+bDjFbNEyaxGLxdmmN+wWK+5+ZLW4vGsOm8Xn3iOMFgubWtgt bjeuYLP4uWseiwOfx5p5axg9dtxdwuixc9Zddo9NqzrZPHqb37F5bHy3g8nj76z9LB59W1Yx enzeJBfAGcVlk5Kak1mWWqRvl8CVsX3pGZaCHv2K77svMzYwzlHrYuTkkBAwkbjTfY+1i5GL Q0hgN6PEy51HmCESkhLTLh4FsjmAbGGJw4eLIWo+MUrsb73FClLDJqAlsf/FDTYQW0TARuLu 4mssIEXMAmuYJN5tP8QEkhAWCJb4t2oCWBGLgKrEi5Xf2EFsXgEriY2PjrBDLJOXWL3hANhi TgFriS2bJzOC2EJANR/O7GWewMi3gJFhFaNkakFxbnpusWGBYV5quV5xYm5xaV66XnJ+7iZG cJBrae5g3L7qg94hRiYOxkOMEhzMSiK8Car/4oR4UxIrq1KL8uOLSnNSiw8xSnOwKInz3ihc GCckkJ5YkpqdmlqQWgSTZeLglGpgUvavTU3s3OL3zLPejU/61Vv+/SFmF2a6HC/aNzP+ef7E cH+1tq0Kk9r99rz+FNnVfH5rearnF/0v9aynzfKOFvikrb++rPEy5165kP++M3ZkcM3syr/7 dP3R7VEbm1Y+aXh35NR5zQ9FHJ8tiqrm3biY0VHsenv9s8y5z4Jydvrp//uotFA7qzOjQcNz gv2WT78X9PWeEOO/EjSFtclUX4f5SPn+3GMx964vSaj/EqY0I8vK9NLtG/6GNyeu37fbUfLe y8Zd6Snrs54ai5apyu3cfH2r4tfZilYyd+1uznZI0ucr/eTecnSOYOYbocJ0j00XprSfEXvH brQmqz6kvMJ6ik+w2d/gH/y/txkHKrEUZyQaajEXFScCADGnQrXhAgAA X-CMS-MailID: 20200703095657epcas1p15695a8d0d48e5bf0b195cc5f893a0e72 X-Msg-Generator: CA X-Sendblock-Type: SVC_REQ_APPROVE CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20200703095657epcas1p15695a8d0d48e5bf0b195cc5f893a0e72 References: <20200703100810.12304-1-cw00.choi@samsung.com> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org The sysfs attr interface used eithere 'df' or 'devfreq' for devfreq instance name. In order to keep the consistency and to improve the readabilty, unify the instance name as 'df'. Signed-off-by: Chanwoo Choi --- drivers/devfreq/devfreq.c | 73 +++++++++++++++++++++------------------ 1 file changed, 40 insertions(+), 33 deletions(-) diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 2a4aa8742520..41729a4173ca 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -1280,18 +1280,20 @@ EXPORT_SYMBOL(devfreq_remove_governor); static ssize_t name_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct devfreq *devfreq = to_devfreq(dev); - return sprintf(buf, "%s\n", dev_name(devfreq->dev.parent)); + struct devfreq *df = to_devfreq(dev); + return sprintf(buf, "%s\n", dev_name(df->dev.parent)); } static DEVICE_ATTR_RO(name); static ssize_t governor_show(struct device *dev, struct device_attribute *attr, char *buf) { - if (!to_devfreq(dev)->governor) + struct devfreq *df = to_devfreq(dev); + + if (!df->governor) return -EINVAL; - return sprintf(buf, "%s\n", to_devfreq(dev)->governor->name); + return sprintf(buf, "%s\n", df->governor->name); } static ssize_t governor_store(struct device *dev, struct device_attribute *attr, @@ -1302,6 +1304,9 @@ static ssize_t governor_store(struct device *dev, struct device_attribute *attr, char str_governor[DEVFREQ_NAME_LEN + 1]; const struct devfreq_governor *governor, *prev_governor; + if (!df->governor) + return -EINVAL; + ret = sscanf(buf, "%" __stringify(DEVFREQ_NAME_LEN) "s", str_governor); if (ret != 1) return -EINVAL; @@ -1315,20 +1320,18 @@ static ssize_t governor_store(struct device *dev, struct device_attribute *attr, if (df->governor == governor) { ret = 0; goto out; - } else if ((df->governor && df->governor->immutable) || - governor->immutable) { + } else if (df->governor->immutable || governor->immutable) { ret = -EINVAL; goto out; } - if (df->governor) { - ret = df->governor->event_handler(df, DEVFREQ_GOV_STOP, NULL); - if (ret) { - dev_warn(dev, "%s: Governor %s not stopped(%d)\n", - __func__, df->governor->name, ret); - goto out; - } + ret = df->governor->event_handler(df, DEVFREQ_GOV_STOP, NULL); + if (ret) { + dev_warn(dev, "%s: Governor %s not stopped(%d)\n", + __func__, df->governor->name, ret); + goto out; } + prev_governor = df->governor; df->governor = governor; strncpy(df->governor_name, governor->name, DEVFREQ_NAME_LEN); @@ -1403,27 +1406,31 @@ static ssize_t cur_freq_show(struct device *dev, struct device_attribute *attr, char *buf) { unsigned long freq; - struct devfreq *devfreq = to_devfreq(dev); + struct devfreq *df = to_devfreq(dev); - if (devfreq->profile->get_cur_freq && - !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq)) + if (df->profile->get_cur_freq && + !df->profile->get_cur_freq(df->dev.parent, &freq)) return sprintf(buf, "%lu\n", freq); - return sprintf(buf, "%lu\n", devfreq->previous_freq); + return sprintf(buf, "%lu\n", df->previous_freq); } static DEVICE_ATTR_RO(cur_freq); static ssize_t target_freq_show(struct device *dev, struct device_attribute *attr, char *buf) { - return sprintf(buf, "%lu\n", to_devfreq(dev)->previous_freq); + struct devfreq *df = to_devfreq(dev); + + return sprintf(buf, "%lu\n", df->previous_freq); } static DEVICE_ATTR_RO(target_freq); static ssize_t polling_interval_show(struct device *dev, struct device_attribute *attr, char *buf) { - return sprintf(buf, "%d\n", to_devfreq(dev)->profile->polling_ms); + struct devfreq *df = to_devfreq(dev); + + return sprintf(buf, "%d\n", df->profile->polling_ms); } static ssize_t polling_interval_store(struct device *dev, @@ -1571,49 +1578,49 @@ static DEVICE_ATTR_RO(available_frequencies); static ssize_t trans_stat_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct devfreq *devfreq = to_devfreq(dev); + struct devfreq *df = to_devfreq(dev); ssize_t len; int i, j; - unsigned int max_state = devfreq->profile->max_state; + unsigned int max_state = df->profile->max_state; if (max_state == 0) return sprintf(buf, "Not Supported.\n"); - mutex_lock(&devfreq->lock); - if (!devfreq->stop_polling && - devfreq_update_status(devfreq, devfreq->previous_freq)) { - mutex_unlock(&devfreq->lock); + mutex_lock(&df->lock); + if (!df->stop_polling && + devfreq_update_status(df, df->previous_freq)) { + mutex_unlock(&df->lock); return 0; } - mutex_unlock(&devfreq->lock); + mutex_unlock(&df->lock); len = sprintf(buf, " From : To\n"); len += sprintf(buf + len, " :"); for (i = 0; i < max_state; i++) len += sprintf(buf + len, "%10lu", - devfreq->profile->freq_table[i]); + df->profile->freq_table[i]); len += sprintf(buf + len, " time(ms)\n"); for (i = 0; i < max_state; i++) { - if (devfreq->profile->freq_table[i] - == devfreq->previous_freq) { + if (df->profile->freq_table[i] + == df->previous_freq) { len += sprintf(buf + len, "*"); } else { len += sprintf(buf + len, " "); } len += sprintf(buf + len, "%10lu:", - devfreq->profile->freq_table[i]); + df->profile->freq_table[i]); for (j = 0; j < max_state; j++) len += sprintf(buf + len, "%10u", - devfreq->stats.trans_table[(i * max_state) + j]); + df->stats.trans_table[(i * max_state) + j]); len += sprintf(buf + len, "%10llu\n", (u64) - jiffies64_to_msecs(devfreq->stats.time_in_state[i])); + jiffies64_to_msecs(df->stats.time_in_state[i])); } len += sprintf(buf + len, "Total transition : %u\n", - devfreq->stats.total_trans); + df->stats.total_trans); return len; } From patchwork Fri Jul 3 10:08:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chanwoo Choi X-Patchwork-Id: 11641619 X-Patchwork-Delegate: cw00.choi@samsung.com 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 358FF13BD for ; Fri, 3 Jul 2020 09:57:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 09C3720885 for ; Fri, 3 Jul 2020 09:57:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b="k8TWXgHT" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726169AbgGCJ5O (ORCPT ); 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Fri, 3 Jul 2020 18:56:57 +0900 (KST) Received: from localhost.localdomain (unknown [10.113.221.102]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20200703095657epsmtip1a5ab9363905b791cb37a3065f62020be~eNZGaLtxw0151101511epsmtip1g; Fri, 3 Jul 2020 09:56:57 +0000 (GMT) From: Chanwoo Choi To: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: leonard.crestez@nxp.com, lukasz.luba@arm.com, enric.balletbo@collabora.com, hl@rock-chips.com, digetx@gmail.com, thierry.reding@gmail.com, jonathanh@nvidia.com, abel.vesa@nxp.com, cw00.choi@samsung.com, chanwoo@kernel.org, myungjoo.ham@samsung.com, kyungmin.park@samsung.com Subject: [PATCH 2/2] PM / devfreq: Add governor flags to clarify the features Date: Fri, 3 Jul 2020 19:08:10 +0900 Message-Id: <20200703100810.12304-3-cw00.choi@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200703100810.12304-1-cw00.choi@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprMJsWRmVeSWpSXmKPExsWy7bCmru4rhv9xBmc3mlgsu3SU0WLijSss Fte/PGe1WP3xMaPFmtuHGC1+bDjFbNEyaxGLxdmmN+wWK+5+ZLW4vGsOm8Xn3iOMFgubWtgt bjeuYLP4uWseiwOfx5p5axg9dtxdwuixc9Zddo9NqzrZPHqb37F5bHy3g8nj76z9LB59W1Yx enzeJBfAGZVtk5GamJJapJCal5yfkpmXbqvkHRzvHG9qZmCoa2hpYa6kkJeYm2qr5OIToOuW mQN0vZJCWWJOKVAoILG4WEnfzqYov7QkVSEjv7jEVim1ICWnwLJArzgxt7g0L10vOT/XytDA wMgUqDAhO+PPB4mCbZMZKxZ1PGBqYPxa1sXIySEhYCLx6Ndd5i5GLg4hgR2MEpeuPGeHcD4x SmzfswvK+cYosXVJNztMy6lXZ9hAbCGBvYwSCycLQBR9YZRYs7WTBSTBJqAlsf/FDbAiEQEr idP/O8B2MAvMY5JYfPoqWJGwgL/E5kuPgIo4OFgEVCXO/qwCCfMC1Xc/2MoGsUxeYvWGA8wg NqeAtcSWzZMZIeJzOSRWn8+FsF0kWlfuY4WwhSVeHd8CdaiUxMv+Nii7WmLlySNsIDdICHQw SmzZfwGqwVhi/9LJTCA3MAtoSqzfpQ8RVpTY+Xsu2C5mAT6Jd197WEFKJAR4JTrahCBKlCUu P7jLBGFLSixu74Q62UNi9aoPbJAw6WOUuHrzAMsERrlZCBsWMDKuYhRLLSjOTU8tNiwwRY6x TYzg1KlluYNx+tsPeocYmTgYDzFKcDArifAmqP6LE+JNSaysSi3Kjy8qzUktPsRoCgy7icxS osn5wOSdVxJvaGpkbGxsYWJoZmpoqCTO62R9IU5IID2xJDU7NbUgtQimj4mDU6qBKXGnY+a1 gw+PeC4Uk/e7b53Dz/rwoOB2yROxW4XurKz+NOPNlf8mG4IUnuSybv7w8+r6mxfT9sytzGy5 Zt7dL6wc19a1meFIese5h8d0z3dLuf+/vetEWXjXKZl7y88ln0xq82Mzqjt6Qvn9p3+17351 bVzKE9py7MX8d8V3f4tcWnk05u7yRdKScXbX/wYfuHBX455Vae39tiCPYPZVPcVmZYc/H41W 9F8Ze0ONzUlGcO2J5/OSGbs+3qhLUZlpJql+tubgjTfvfO5Ev2ZY/aLx8PEHNTeq+mp7ygxu RP2tzfvEcNNH2WVby4NU0fK3TNPTihOnrO7bJi2ge/3XDdMJrfcXvrd7+sHRzyrWQEOJpTgj 0VCLuag4EQBh6E4kJgQAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrLLMWRmVeSWpSXmKPExsWy7bCSnO5Lhv9xBmu2Glksu3SU0WLijSss Fte/PGe1WP3xMaPFmtuHGC1+bDjFbNEyaxGLxdmmN+wWK+5+ZLW4vGsOm8Xn3iOMFgubWtgt bjeuYLP4uWseiwOfx5p5axg9dtxdwuixc9Zddo9NqzrZPHqb37F5bHy3g8nj76z9LB59W1Yx enzeJBfAGcVlk5Kak1mWWqRvl8CV8eeDRMG2yYwVizoeMDUwfi3rYuTkkBAwkTj16gxbFyMX h5DAbkaJpQs+sUIkJCWmXTzK3MXIAWQLSxw+XAxR84lR4ujmlYwgNWwCWhL7X9xgA7FFBGwk 7i6+xgJSxCywhkni3fZDTCAJYQFfib1/WsEGsQioSpz9WQUS5hWwkuh+sJUNYpe8xOoNB5hB bE4Ba4ktmyeDzRcCqvlwZi/zBEa+BYwMqxglUwuKc9Nziw0LDPNSy/WKE3OLS/PS9ZLzczcx gkNcS3MH4/ZVH/QOMTJxMB5ilOBgVhLhTVD9FyfEm5JYWZValB9fVJqTWnyIUZqDRUmc90bh wjghgfTEktTs1NSC1CKYLBMHp1QD0+xGGy73+NWbL69PFF5t+2rjfreX3N6ZGhN3CDcLHnSQ Pj2344BjpFXxZePg88cdtJSFXP6JnY0NtG5r310172fSNNFtE5eweaaflMlwbxapyt299sKv +C9uiqxqes1/yp3yuQwtLUuDb96v33xq6cpNFV833T6m4PRoh8pLlcmTyqOyZwkeOyu5qeXS kqSU8HTn6J0L9jB48yeKPeab9+QiS+/0ySbnRK5ZFS2p+H/i2TmR71Ypm5VvTzmX9Tdd4GPU 7LNpSw9I7HG+FVF57DCra/vqtxf+FS0NjY+ezamVt+xC3mbma79KDgd4HHxgK24iubQ422CH KOvuQL+Hbo/l5mdUcWoc+fntRZfraSWW4oxEQy3mouJEAIO7zG/gAgAA X-CMS-MailID: 20200703095657epcas1p187b7f90a4a33da7791a83a78760f3a91 X-Msg-Generator: CA X-Sendblock-Type: SVC_REQ_APPROVE CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20200703095657epcas1p187b7f90a4a33da7791a83a78760f3a91 References: <20200703100810.12304-1-cw00.choi@samsung.com> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org DEVFREQ supports the default governors like performance, powersave and also allows the devfreq driver to add their own governor like tegra30-devfreq.c according to their requirement. In result, some sysfs attributes are useful or not useful. Prior to that the user can access all sysfs attributes regardless of availability. So, clarify the access permission of sysfs attributes according to governor. When adding the devfreq governor, can specify the available attribute information by using DEVFREQ_GOV_ATTR_* constant variable. The user can read or write the sysfs attributes in accordance to the specified attributes. /* Devfreq governor flags for attribtures and features */ [Definition for sysfs attributes] - DEVFREQ_GOV_ATTR_GOVERNOR - DEVFREQ_GOV_ATTR_AVAIL_GOVERNORS - DEVFREQ_GOV_ATTR_AVAIL_FREQUENCIES - DEVFREQ_GOV_ATTR_CUR_FREQ - DEVFREQ_GOV_ATTR_TARGET_FREQ - DEVFREQ_GOV_ATTR_MIN_FREQ - DEVFREQ_GOV_ATTR_MAX_FREQ - DEVFREQ_GOV_ATTR_TRANS_STAT - DEVFREQ_GOV_ATTR_POLLING_INTERVAL - DEVFREQ_GOV_ATTR_TIMER Also, the devfreq governor is able to have the specific flag as follows in order to implement the specific feature. For example, Devfreq allows user to change the governors on runtime via sysfs interface. But, if devfreq device uses 'passive' governor, don't allow user to change the governor. For this case, define the DEVFREQ_GOV_FLAT_IMMUTABLE and set it to flag of passive governor. [Definition for governor flag] - DEVFREQ_GOV_FLAG_IMMUTABLE : If immutable flag is set, governor is never changeable to other governors. - DEVFREQ_GOV_FLAG_IRQ_DRIVEN : Devfreq core won't schedule polling work for this governor if value is set. [Table of governor flag for devfreq governors] ------------------------------------------------------------------------------ | simple | perfor | power | user | passive | tegra30 | ondemand | mance | save | space| | ------------------------------------------------------------------------------ governor | O | O | O | O | O | O available_governors | O | O | O | O | O | O available_frequencies | O | O | O | O | O | O cur_freq | O | O | O | O | O | O target_freq | O | O | O | O | O | O min_freq | O | O | O | O | O | O max_freq | O | O | O | O | O | O trans_stat | O | O | O | O | O | O -------------------------------------------------------- polling_interval | O | X | X | X | X | O timer | O | X | X | X | X | X ------------------------------------------------------------------------------ immutable | X | X | X | X | O | O interrupt_driven | X(polling)| X | X | X | X | O (irq) ------------------------------------------------------------------------------ Signed-off-by: Chanwoo Choi --- drivers/devfreq/devfreq.c | 117 +++++++++++++++++++--- drivers/devfreq/governor.h | 45 +++++++-- drivers/devfreq/governor_passive.c | 3 +- drivers/devfreq/governor_performance.c | 1 + drivers/devfreq/governor_powersave.c | 1 + drivers/devfreq/governor_simpleondemand.c | 3 + drivers/devfreq/governor_userspace.c | 1 + drivers/devfreq/tegra30-devfreq.c | 6 +- 8 files changed, 156 insertions(+), 21 deletions(-) diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 41729a4173ca..2ad638f2ed2b 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -456,7 +456,7 @@ static void devfreq_monitor(struct work_struct *work) */ void devfreq_monitor_start(struct devfreq *devfreq) { - if (devfreq->governor->interrupt_driven) + if (DEVFREQ_GOV_FLAG_IRQ_DRIVEN & devfreq->governor->flag) return; switch (devfreq->profile->timer) { @@ -486,7 +486,7 @@ EXPORT_SYMBOL(devfreq_monitor_start); */ void devfreq_monitor_stop(struct devfreq *devfreq) { - if (devfreq->governor->interrupt_driven) + if (DEVFREQ_GOV_FLAG_IRQ_DRIVEN & devfreq->governor->flag) return; cancel_delayed_work_sync(&devfreq->work); @@ -517,7 +517,7 @@ void devfreq_monitor_suspend(struct devfreq *devfreq) devfreq->stop_polling = true; mutex_unlock(&devfreq->lock); - if (devfreq->governor->interrupt_driven) + if (DEVFREQ_GOV_FLAG_IRQ_DRIVEN & devfreq->governor->flag) return; cancel_delayed_work_sync(&devfreq->work); @@ -537,12 +537,13 @@ void devfreq_monitor_resume(struct devfreq *devfreq) unsigned long freq; mutex_lock(&devfreq->lock); - if (!devfreq->stop_polling) - goto out; - if (devfreq->governor->interrupt_driven) + if (DEVFREQ_GOV_FLAG_IRQ_DRIVEN & devfreq->governor->flag) goto out_update; + if (!devfreq->stop_polling) + goto out; + if (!delayed_work_pending(&devfreq->work) && devfreq->profile->polling_ms) queue_delayed_work(devfreq_wq, &devfreq->work, @@ -577,10 +578,10 @@ void devfreq_update_interval(struct devfreq *devfreq, unsigned int *delay) mutex_lock(&devfreq->lock); devfreq->profile->polling_ms = new_delay; - if (devfreq->stop_polling) - goto out; + if (DEVFREQ_GOV_FLAG_IRQ_DRIVEN & devfreq->governor->flag) + return; - if (devfreq->governor->interrupt_driven) + if (devfreq->stop_polling) goto out; /* if new delay is zero, stop polling */ @@ -1281,6 +1282,13 @@ static ssize_t name_show(struct device *dev, struct device_attribute *attr, char *buf) { struct devfreq *df = to_devfreq(dev); + + if (!df->governor) + return -EINVAL; + + if (!(DEVFREQ_GOV_ATTR_NAME & df->governor->attr)) + return -EACCES; + return sprintf(buf, "%s\n", dev_name(df->dev.parent)); } static DEVICE_ATTR_RO(name); @@ -1293,6 +1301,9 @@ static ssize_t governor_show(struct device *dev, if (!df->governor) return -EINVAL; + if (!(DEVFREQ_GOV_ATTR_GOVERNOR & df->governor->attr)) + return -EACCES; + return sprintf(buf, "%s\n", df->governor->name); } @@ -1307,6 +1318,9 @@ static ssize_t governor_store(struct device *dev, struct device_attribute *attr, if (!df->governor) return -EINVAL; + if (!(DEVFREQ_GOV_ATTR_GOVERNOR & df->governor->attr)) + return -EACCES; + ret = sscanf(buf, "%" __stringify(DEVFREQ_NAME_LEN) "s", str_governor); if (ret != 1) return -EINVAL; @@ -1320,7 +1334,8 @@ static ssize_t governor_store(struct device *dev, struct device_attribute *attr, if (df->governor == governor) { ret = 0; goto out; - } else if (df->governor->immutable || governor->immutable) { + } else if ((DEVFREQ_GOV_FLAG_IMMUTABLE & df->governor->flag) + || (DEVFREQ_GOV_FLAG_IMMUTABLE & governor->flag)) { ret = -EINVAL; goto out; } @@ -1366,13 +1381,19 @@ static ssize_t available_governors_show(struct device *d, struct devfreq *df = to_devfreq(d); ssize_t count = 0; + if (!df->governor) + return -EINVAL; + + if (!(DEVFREQ_GOV_ATTR_AVAIL_GOVERNORS & df->governor->attr)) + return -EACCES; + mutex_lock(&devfreq_list_lock); /* * The devfreq with immutable governor (e.g., passive) shows * only own governor. */ - if (df->governor && df->governor->immutable) { + if (DEVFREQ_GOV_FLAG_IMMUTABLE & df->governor->flag) { count = scnprintf(&buf[count], DEVFREQ_NAME_LEN, "%s ", df->governor_name); /* @@ -1383,7 +1404,7 @@ static ssize_t available_governors_show(struct device *d, struct devfreq_governor *governor; list_for_each_entry(governor, &devfreq_governor_list, node) { - if (governor->immutable) + if (DEVFREQ_GOV_FLAG_IMMUTABLE & governor->flag) continue; count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), "%s ", governor->name); @@ -1408,6 +1429,12 @@ static ssize_t cur_freq_show(struct device *dev, struct device_attribute *attr, unsigned long freq; struct devfreq *df = to_devfreq(dev); + if (!df->governor) + return -EINVAL; + + if (!(DEVFREQ_GOV_ATTR_CUR_FREQ & df->governor->attr)) + return -EACCES; + if (df->profile->get_cur_freq && !df->profile->get_cur_freq(df->dev.parent, &freq)) return sprintf(buf, "%lu\n", freq); @@ -1421,6 +1448,12 @@ static ssize_t target_freq_show(struct device *dev, { struct devfreq *df = to_devfreq(dev); + if (!df->governor) + return -EINVAL; + + if (!(DEVFREQ_GOV_ATTR_TARGET_FREQ & df->governor->attr)) + return -EACCES; + return sprintf(buf, "%lu\n", df->previous_freq); } static DEVICE_ATTR_RO(target_freq); @@ -1430,6 +1463,12 @@ static ssize_t polling_interval_show(struct device *dev, { struct devfreq *df = to_devfreq(dev); + if (!df->governor) + return -EINVAL; + + if (!(DEVFREQ_GOV_ATTR_POLLING_INTERVAL & df->governor->attr)) + return -EACCES; + return sprintf(buf, "%d\n", df->profile->polling_ms); } @@ -1444,6 +1483,9 @@ static ssize_t polling_interval_store(struct device *dev, if (!df->governor) return -EINVAL; + if (!(DEVFREQ_GOV_ATTR_POLLING_INTERVAL & df->governor->attr)) + return -EACCES; + ret = sscanf(buf, "%u", &value); if (ret != 1) return -EINVAL; @@ -1462,6 +1504,12 @@ static ssize_t min_freq_store(struct device *dev, struct device_attribute *attr, unsigned long value; int ret; + if (!df->governor) + return -EINVAL; + + if (!(DEVFREQ_GOV_ATTR_MIN_FREQ & df->governor->attr)) + return -EACCES; + /* * Protect against theoretical sysfs writes between * device_add and dev_pm_qos_add_request @@ -1488,6 +1536,12 @@ static ssize_t min_freq_show(struct device *dev, struct device_attribute *attr, struct devfreq *df = to_devfreq(dev); unsigned long min_freq, max_freq; + if (!df->governor) + return -EINVAL; + + if (!(DEVFREQ_GOV_ATTR_MIN_FREQ & df->governor->attr)) + return -EACCES; + mutex_lock(&df->lock); get_freq_range(df, &min_freq, &max_freq); mutex_unlock(&df->lock); @@ -1503,6 +1557,12 @@ static ssize_t max_freq_store(struct device *dev, struct device_attribute *attr, unsigned long value; int ret; + if (!df->governor) + return -EINVAL; + + if (!(DEVFREQ_GOV_ATTR_MAX_FREQ & df->governor->attr)) + return -EACCES; + /* * Protect against theoretical sysfs writes between * device_add and dev_pm_qos_add_request @@ -1542,6 +1602,12 @@ static ssize_t max_freq_show(struct device *dev, struct device_attribute *attr, struct devfreq *df = to_devfreq(dev); unsigned long min_freq, max_freq; + if (!df->governor) + return -EINVAL; + + if (!(DEVFREQ_GOV_ATTR_MAX_FREQ & df->governor->attr)) + return -EACCES; + mutex_lock(&df->lock); get_freq_range(df, &min_freq, &max_freq); mutex_unlock(&df->lock); @@ -1558,6 +1624,12 @@ static ssize_t available_frequencies_show(struct device *d, ssize_t count = 0; int i; + if (!df->governor) + return -EINVAL; + + if (!(DEVFREQ_GOV_ATTR_AVAIL_FREQUENCIES & df->governor->attr)) + return -EACCES; + mutex_lock(&df->lock); for (i = 0; i < df->profile->max_state; i++) @@ -1583,6 +1655,12 @@ static ssize_t trans_stat_show(struct device *dev, int i, j; unsigned int max_state = df->profile->max_state; + if (!df->governor) + return -EINVAL; + + if (!(DEVFREQ_GOV_ATTR_TRANS_STAT & df->governor->attr)) + return -EACCES; + if (max_state == 0) return sprintf(buf, "Not Supported.\n"); @@ -1631,6 +1709,12 @@ static ssize_t trans_stat_store(struct device *dev, struct devfreq *df = to_devfreq(dev); int err, value; + if (!df->governor) + return -EINVAL; + + if (!(DEVFREQ_GOV_ATTR_TRANS_STAT & df->governor->attr)) + return -EACCES; + if (df->profile->max_state == 0) return count; @@ -1660,6 +1744,9 @@ static ssize_t timer_show(struct device *dev, if (!df->governor) return -EINVAL; + if (!(DEVFREQ_GOV_ATTR_TIMER & df->governor->attr)) + return -EACCES; + return sprintf(buf, "%s\n", timer_name[df->profile->timer]); } @@ -1671,6 +1758,12 @@ static ssize_t timer_store(struct device *dev, struct device_attribute *attr, int timer = -1; int ret = 0, i; + if (!df->governor) + return -EINVAL; + + if (!(DEVFREQ_GOV_ATTR_TIMER & df->governor->attr)) + return -EACCES; + ret = sscanf(buf, "%16s", str_timer); if (ret != 1) return -EINVAL; diff --git a/drivers/devfreq/governor.h b/drivers/devfreq/governor.h index ae4d0cc18359..7385989580a0 100644 --- a/drivers/devfreq/governor.h +++ b/drivers/devfreq/governor.h @@ -25,14 +25,47 @@ #define DEVFREQ_MIN_FREQ 0 #define DEVFREQ_MAX_FREQ ULONG_MAX +/* Devfreq governor flags for attribtures and features */ +#define DEVFREQ_GOV_ATTR_NAME BIT(0) +#define DEVFREQ_GOV_ATTR_GOVERNOR BIT(1) +#define DEVFREQ_GOV_ATTR_AVAIL_GOVERNORS BIT(2) +#define DEVFREQ_GOV_ATTR_AVAIL_FREQUENCIES BIT(3) +#define DEVFREQ_GOV_ATTR_CUR_FREQ BIT(4) +#define DEVFREQ_GOV_ATTR_TARGET_FREQ BIT(5) +#define DEVFREQ_GOV_ATTR_MIN_FREQ BIT(6) +#define DEVFREQ_GOV_ATTR_MAX_FREQ BIT(7) +#define DEVFREQ_GOV_ATTR_TRANS_STAT BIT(8) +#define DEVFREQ_GOV_ATTR_POLLING_INTERVAL BIT(9) +#define DEVFREQ_GOV_ATTR_TIMER BIT(10) + +#define DEVFREQ_GOV_ATTR_COMMON (DEVFREQ_GOV_ATTR_NAME \ + | DEVFREQ_GOV_ATTR_GOVERNOR \ + | DEVFREQ_GOV_ATTR_AVAIL_GOVERNORS \ + | DEVFREQ_GOV_ATTR_AVAIL_FREQUENCIES \ + | DEVFREQ_GOV_ATTR_CUR_FREQ \ + | DEVFREQ_GOV_ATTR_TARGET_FREQ \ + | DEVFREQ_GOV_ATTR_MIN_FREQ \ + | DEVFREQ_GOV_ATTR_MAX_FREQ \ + | DEVFREQ_GOV_ATTR_TRANS_STAT ) + +/* + * If immutable flag is set, this governor is never changeable + * to other governors. + */ +#define DEVFREQ_GOV_FLAG_IMMUTABLE BIT(0) + +/* + * Devfreq core won't schedule polling work for this + * governor if value is set to 1. + */ +#define DEVFREQ_GOV_FLAG_IRQ_DRIVEN BIT(1) + /** * struct devfreq_governor - Devfreq policy governor * @node: list node - contains registered devfreq governors * @name: Governor's name - * @immutable: Immutable flag for governor. If the value is 1, - * this governor is never changeable to other governor. - * @interrupt_driven: Devfreq core won't schedule polling work for this - * governor if value is set to 1. + * @attr: Governor's attribute flag + * @flag: Governor's flag * @get_target_freq: Returns desired operating frequency for the device. * Basically, get_target_freq will run * devfreq_dev_profile.get_dev_status() to get the @@ -50,8 +83,8 @@ struct devfreq_governor { struct list_head node; const char name[DEVFREQ_NAME_LEN]; - const unsigned int immutable; - const unsigned int interrupt_driven; + const unsigned long attr; + const unsigned long flag; int (*get_target_freq)(struct devfreq *this, unsigned long *freq); int (*event_handler)(struct devfreq *devfreq, unsigned int event, void *data); diff --git a/drivers/devfreq/governor_passive.c b/drivers/devfreq/governor_passive.c index be6eeab9c814..671a5f8f774e 100644 --- a/drivers/devfreq/governor_passive.c +++ b/drivers/devfreq/governor_passive.c @@ -180,7 +180,8 @@ static int devfreq_passive_event_handler(struct devfreq *devfreq, static struct devfreq_governor devfreq_passive = { .name = DEVFREQ_GOV_PASSIVE, - .immutable = 1, + .attr = DEVFREQ_GOV_ATTR_COMMON, + .flag = DEVFREQ_GOV_FLAG_IMMUTABLE, .get_target_freq = devfreq_passive_get_target_freq, .event_handler = devfreq_passive_event_handler, }; diff --git a/drivers/devfreq/governor_performance.c b/drivers/devfreq/governor_performance.c index 5dbc1e56ec08..7ae9829775b8 100644 --- a/drivers/devfreq/governor_performance.c +++ b/drivers/devfreq/governor_performance.c @@ -37,6 +37,7 @@ static int devfreq_performance_handler(struct devfreq *devfreq, static struct devfreq_governor devfreq_performance = { .name = DEVFREQ_GOV_PERFORMANCE, + .attr = DEVFREQ_GOV_ATTR_COMMON, .get_target_freq = devfreq_performance_func, .event_handler = devfreq_performance_handler, }; diff --git a/drivers/devfreq/governor_powersave.c b/drivers/devfreq/governor_powersave.c index 4746af2435b0..8761cc400f8a 100644 --- a/drivers/devfreq/governor_powersave.c +++ b/drivers/devfreq/governor_powersave.c @@ -37,6 +37,7 @@ static int devfreq_powersave_handler(struct devfreq *devfreq, static struct devfreq_governor devfreq_powersave = { .name = DEVFREQ_GOV_POWERSAVE, + .attr = DEVFREQ_GOV_ATTR_COMMON, .get_target_freq = devfreq_powersave_func, .event_handler = devfreq_powersave_handler, }; diff --git a/drivers/devfreq/governor_simpleondemand.c b/drivers/devfreq/governor_simpleondemand.c index 1b314e1df028..57083b83a094 100644 --- a/drivers/devfreq/governor_simpleondemand.c +++ b/drivers/devfreq/governor_simpleondemand.c @@ -117,6 +117,9 @@ static int devfreq_simple_ondemand_handler(struct devfreq *devfreq, static struct devfreq_governor devfreq_simple_ondemand = { .name = DEVFREQ_GOV_SIMPLE_ONDEMAND, + .attr = DEVFREQ_GOV_ATTR_COMMON + | DEVFREQ_GOV_ATTR_POLLING_INTERVAL + | DEVFREQ_GOV_ATTR_TIMER, .get_target_freq = devfreq_simple_ondemand_func, .event_handler = devfreq_simple_ondemand_handler, }; diff --git a/drivers/devfreq/governor_userspace.c b/drivers/devfreq/governor_userspace.c index 0fd6c4851071..a32bdea49fa3 100644 --- a/drivers/devfreq/governor_userspace.c +++ b/drivers/devfreq/governor_userspace.c @@ -132,6 +132,7 @@ static int devfreq_userspace_handler(struct devfreq *devfreq, static struct devfreq_governor devfreq_userspace = { .name = DEVFREQ_GOV_USERSPACE, + .attr = DEVFREQ_GOV_ATTR_COMMON, .get_target_freq = devfreq_userspace_func, .event_handler = devfreq_userspace_handler, }; diff --git a/drivers/devfreq/tegra30-devfreq.c b/drivers/devfreq/tegra30-devfreq.c index e94a27804c20..620ecd250d7c 100644 --- a/drivers/devfreq/tegra30-devfreq.c +++ b/drivers/devfreq/tegra30-devfreq.c @@ -765,10 +765,12 @@ static int tegra_governor_event_handler(struct devfreq *devfreq, static struct devfreq_governor tegra_devfreq_governor = { .name = "tegra_actmon", + .flag = DEVFREQ_GOV_FLAG_ATTR_COMMON + | DEVFREQ_GOV_FLAG_ATTR_POLLING_INTERVAL, + .flag = DEVFREQ_GOV_FLAG_FLAG_IMMUTABLE, + | DEVFREQ_GOV_FLAG_FLAG_IRQ_DRIVEN, .get_target_freq = tegra_governor_get_target, .event_handler = tegra_governor_event_handler, - .immutable = true, - .interrupt_driven = true, }; static int tegra_devfreq_probe(struct platform_device *pdev)