From: Leonard Crestez <leonard.crestez@nxp.com> To: MyungJoo Ham <myungjoo.ham@samsung.com>, Kyungmin Park <kyungmin.park@samsung.com>, Matthias Kaehlcke <mka@chromium.org> Cc: "Chanwoo Choi" <cw00.choi@samsung.com>, "Artur Świgoń" <a.swigon@partner.samsung.com>, "Saravana Kannan" <saravanak@google.com>, "Krzysztof Kozlowski" <krzk@kernel.org>, "Alexandre Bailon" <abailon@baylibre.com>, "Georgi Djakov" <georgi.djakov@linaro.org>, "Abel Vesa" <abel.vesa@nxp.com>, "Jacky Bai" <ping.bai@nxp.com>, "Viresh Kumar" <viresh.kumar@linaro.org>, "Lukasz Luba" <l.luba@partner.samsung.com>, "NXP Linux Team" <linux-imx@nxp.com>, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v8 0/6] PM / devfreq: Add dev_pm_qos support Date: Tue, 24 Sep 2019 13:11:24 +0300 [thread overview] Message-ID: <cover.1569319738.git.leonard.crestez@nxp.com> (raw) Add dev_pm_qos notifiers to devfreq core in order to support frequency limits via dev_pm_qos_add_request. Unlike the rest of devfreq the dev_pm_qos frequency is measured in Khz, this is consistent with current dev_pm_qos usage for cpufreq and allows frequencies above 2Ghz (pm_qos expresses limits as s32). Like with cpufreq the handling of min_freq/max_freq is moved to the dev_pm_qos mechanism. Constraints from userspace are no longer clamped on store, instead all values can be written and we only check against OPPs in a new devfreq_get_freq_range function. This is consistent with the design of dev_pm_qos. Notifiers from pm_qos are executed under a single global dev_pm_qos_mtx and need to take devfreq->lock. Notifier registration takes the same dev_pm_qos_mtx so in order to prevent lockdep warnings it must be done outside devfreq->lock. Current devfreq_add_device does all initialization under devfreq->lock and that needs to be relaxed. --- Changes since v7: * Only #define HZ_PER_KHZ in patch where it's used. * Drop devfreq_ prefix for some internal functions. * Improve qos update error message. * Remove some unnecessary comments. * Collect reviews Link to v7: https://patchwork.kernel.org/cover/11157649/ Changes since v6: * Don't return errno from devfreq_qos_notifier_call, return NOTIFY_DONE and print the error. * More spelling and punctuation nits Link to v6: https://patchwork.kernel.org/cover/11157201/ Changes since v5: * Drop patches which are not strictly related to PM QoS. * Add a comment explaining why devfreq_add_device needs two cleanup paths. * Remove {} for single line. * Rename {min,max}_freq_req to user_{min,max}_freq_req * Collect reviews Link to v5: https://patchwork.kernel.org/cover/11149497/ Sorry for forgetting to properly label v5. I know this is inside the merge window but review would still be appreciated. Changes since v4: * Move more devfreq_add_device init ahead of device_register. * Make devfreq_dev_release cleanup devices not yet in devfreq_list. This is simpler than previous attempt to add to devfreq_list sonner. * Take devfreq->lock in trans_stat_show * Register dev_pm_opp notifier on devfreq parent dev (which has OPPs) Link to v4: https://patchwork.kernel.org/cover/11114657/ Changes since v4: * Move more devfreq_add_device init ahead of device_register. * Make devfreq_dev_release cleanup devices not yet in devfreq_list. This is simpler than previous attempt to add to devfreq_list sonner. * Take devfreq->lock in trans_stat_show * Register dev_pm_opp notifier on devfreq parent dev (which has OPPs) Like to v4: https://patchwork.kernel.org/cover/11114657/ Changes since v3: * Cleanup locking and error-handling in devfreq_add_device * Register notifiers after device registration but before governor start * Keep the initialization of min_req/max_req ahead of device_register because it's used for sysfs handling * Use HZ_PER_KHZ instead of 1000 * Add kernel-doc comments * Move OPP notifier to core Link to v3: https://patchwork.kernel.org/cover/11104061/ Changes since v2: * Handle sysfs via dev_pm_qos (in separate patch) * Add locking to {min,max}_freq_show * Fix checkpatch issues (long lines etc) Link to v2: https://patchwork.kernel.org/patch/11084279/ Changes since v1: * Add doxygen comments for min_nb/max_nb * Remove notifiers on error/cleanup paths. Keep gotos simple by relying on dev_pm_qos_remove_notifier ignoring notifiers which were not added. Link to v1: https://patchwork.kernel.org/patch/11078475/ Leonard Crestez (6): PM / devfreq: Don't fail devfreq_dev_release if not in list PM / devfreq: Move more initialization before registration PM / devfreq: Don't take lock in devfreq_add_device PM / devfreq: Introduce get_freq_range helper PM / devfreq: Add PM QoS support PM / devfreq: Use PM QoS for sysfs min/max_freq drivers/devfreq/devfreq.c | 268 +++++++++++++++++++++++++------------- include/linux/devfreq.h | 14 +- 2 files changed, 191 insertions(+), 91 deletions(-) -- 2.17.1
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From: Leonard Crestez <leonard.crestez@nxp.com> To: MyungJoo Ham <myungjoo.ham@samsung.com>, Kyungmin Park <kyungmin.park@samsung.com>, Matthias Kaehlcke <mka@chromium.org> Cc: "Artur Świgoń" <a.swigon@partner.samsung.com>, "Abel Vesa" <abel.vesa@nxp.com>, "Saravana Kannan" <saravanak@google.com>, linux-pm@vger.kernel.org, "Viresh Kumar" <viresh.kumar@linaro.org>, "NXP Linux Team" <linux-imx@nxp.com>, "Krzysztof Kozlowski" <krzk@kernel.org>, "Lukasz Luba" <l.luba@partner.samsung.com>, "Chanwoo Choi" <cw00.choi@samsung.com>, "Alexandre Bailon" <abailon@baylibre.com>, "Georgi Djakov" <georgi.djakov@linaro.org>, linux-arm-kernel@lists.infradead.org, "Jacky Bai" <ping.bai@nxp.com> Subject: [PATCH v8 0/6] PM / devfreq: Add dev_pm_qos support Date: Tue, 24 Sep 2019 13:11:24 +0300 [thread overview] Message-ID: <cover.1569319738.git.leonard.crestez@nxp.com> (raw) Add dev_pm_qos notifiers to devfreq core in order to support frequency limits via dev_pm_qos_add_request. Unlike the rest of devfreq the dev_pm_qos frequency is measured in Khz, this is consistent with current dev_pm_qos usage for cpufreq and allows frequencies above 2Ghz (pm_qos expresses limits as s32). Like with cpufreq the handling of min_freq/max_freq is moved to the dev_pm_qos mechanism. Constraints from userspace are no longer clamped on store, instead all values can be written and we only check against OPPs in a new devfreq_get_freq_range function. This is consistent with the design of dev_pm_qos. Notifiers from pm_qos are executed under a single global dev_pm_qos_mtx and need to take devfreq->lock. Notifier registration takes the same dev_pm_qos_mtx so in order to prevent lockdep warnings it must be done outside devfreq->lock. Current devfreq_add_device does all initialization under devfreq->lock and that needs to be relaxed. --- Changes since v7: * Only #define HZ_PER_KHZ in patch where it's used. * Drop devfreq_ prefix for some internal functions. * Improve qos update error message. * Remove some unnecessary comments. * Collect reviews Link to v7: https://patchwork.kernel.org/cover/11157649/ Changes since v6: * Don't return errno from devfreq_qos_notifier_call, return NOTIFY_DONE and print the error. * More spelling and punctuation nits Link to v6: https://patchwork.kernel.org/cover/11157201/ Changes since v5: * Drop patches which are not strictly related to PM QoS. * Add a comment explaining why devfreq_add_device needs two cleanup paths. * Remove {} for single line. * Rename {min,max}_freq_req to user_{min,max}_freq_req * Collect reviews Link to v5: https://patchwork.kernel.org/cover/11149497/ Sorry for forgetting to properly label v5. I know this is inside the merge window but review would still be appreciated. Changes since v4: * Move more devfreq_add_device init ahead of device_register. * Make devfreq_dev_release cleanup devices not yet in devfreq_list. This is simpler than previous attempt to add to devfreq_list sonner. * Take devfreq->lock in trans_stat_show * Register dev_pm_opp notifier on devfreq parent dev (which has OPPs) Link to v4: https://patchwork.kernel.org/cover/11114657/ Changes since v4: * Move more devfreq_add_device init ahead of device_register. * Make devfreq_dev_release cleanup devices not yet in devfreq_list. This is simpler than previous attempt to add to devfreq_list sonner. * Take devfreq->lock in trans_stat_show * Register dev_pm_opp notifier on devfreq parent dev (which has OPPs) Like to v4: https://patchwork.kernel.org/cover/11114657/ Changes since v3: * Cleanup locking and error-handling in devfreq_add_device * Register notifiers after device registration but before governor start * Keep the initialization of min_req/max_req ahead of device_register because it's used for sysfs handling * Use HZ_PER_KHZ instead of 1000 * Add kernel-doc comments * Move OPP notifier to core Link to v3: https://patchwork.kernel.org/cover/11104061/ Changes since v2: * Handle sysfs via dev_pm_qos (in separate patch) * Add locking to {min,max}_freq_show * Fix checkpatch issues (long lines etc) Link to v2: https://patchwork.kernel.org/patch/11084279/ Changes since v1: * Add doxygen comments for min_nb/max_nb * Remove notifiers on error/cleanup paths. Keep gotos simple by relying on dev_pm_qos_remove_notifier ignoring notifiers which were not added. Link to v1: https://patchwork.kernel.org/patch/11078475/ Leonard Crestez (6): PM / devfreq: Don't fail devfreq_dev_release if not in list PM / devfreq: Move more initialization before registration PM / devfreq: Don't take lock in devfreq_add_device PM / devfreq: Introduce get_freq_range helper PM / devfreq: Add PM QoS support PM / devfreq: Use PM QoS for sysfs min/max_freq drivers/devfreq/devfreq.c | 268 +++++++++++++++++++++++++------------- include/linux/devfreq.h | 14 +- 2 files changed, 191 insertions(+), 91 deletions(-) -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2019-09-24 10:11 UTC|newest] Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <CGME20190924101140epcas1p4abeedf42f223e65f58c88a0ddf1e4e56@epcas1p4.samsung.com> 2019-09-24 10:11 ` Leonard Crestez [this message] 2019-09-24 10:11 ` [PATCH v8 0/6] PM / devfreq: Add dev_pm_qos support Leonard Crestez 2019-09-24 10:11 ` [PATCH v8 1/6] PM / devfreq: Don't fail devfreq_dev_release if not in list Leonard Crestez 2019-09-24 10:11 ` Leonard Crestez 2019-09-24 10:11 ` [PATCH v8 2/6] PM / devfreq: Move more initialization before registration Leonard Crestez 2019-09-24 10:11 ` Leonard Crestez 2019-09-25 1:46 ` Chanwoo Choi 2019-09-25 1:46 ` Chanwoo Choi 2019-09-24 10:11 ` [PATCH v8 3/6] PM / devfreq: Don't take lock in devfreq_add_device Leonard Crestez 2019-09-24 10:11 ` Leonard Crestez 2019-09-24 10:11 ` [PATCH v8 4/6] PM / devfreq: Introduce get_freq_range helper Leonard Crestez 2019-09-24 10:11 ` Leonard Crestez 2019-09-25 1:37 ` Chanwoo Choi 2019-09-25 1:37 ` Chanwoo Choi 2019-09-25 20:55 ` Leonard Crestez 2019-09-25 20:55 ` Leonard Crestez 2019-09-26 1:06 ` Chanwoo Choi 2019-09-26 1:06 ` Chanwoo Choi 2019-09-26 14:03 ` Leonard Crestez 2019-09-26 14:03 ` Leonard Crestez 2019-09-24 10:11 ` [PATCH v8 5/6] PM / devfreq: Add PM QoS support Leonard Crestez 2019-09-24 10:11 ` Leonard Crestez 2019-09-24 19:11 ` Matthias Kaehlcke 2019-09-24 19:11 ` Matthias Kaehlcke 2019-09-24 19:22 ` Leonard Crestez 2019-09-24 19:22 ` Leonard Crestez 2019-09-25 2:17 ` Chanwoo Choi 2019-09-25 2:17 ` Chanwoo Choi 2019-09-25 19:40 ` Leonard Crestez 2019-09-25 19:40 ` Leonard Crestez 2019-09-26 1:08 ` Chanwoo Choi 2019-09-26 1:08 ` Chanwoo Choi 2019-09-25 2:15 ` Chanwoo Choi 2019-09-25 2:15 ` Chanwoo Choi 2019-09-25 16:06 ` Matthias Kaehlcke 2019-09-25 16:06 ` Matthias Kaehlcke 2019-09-25 21:18 ` Leonard Crestez 2019-09-25 21:18 ` Leonard Crestez 2019-09-26 1:12 ` Chanwoo Choi 2019-09-26 1:12 ` Chanwoo Choi 2019-09-26 13:43 ` Leonard Crestez 2019-09-26 13:43 ` Leonard Crestez 2019-09-27 1:49 ` Chanwoo Choi 2019-09-27 1:49 ` Chanwoo Choi 2019-09-30 13:16 ` Leonard Crestez 2019-09-30 13:16 ` Leonard Crestez 2019-09-30 21:42 ` Chanwoo Choi 2019-09-30 21:42 ` Chanwoo Choi 2019-10-01 9:39 ` Leonard Crestez 2019-10-01 9:39 ` Leonard Crestez 2019-10-01 21:55 ` Chanwoo Choi 2019-10-01 21:55 ` Chanwoo Choi 2019-09-26 1:19 ` Chanwoo Choi 2019-09-26 1:19 ` Chanwoo Choi 2019-09-30 12:43 ` Leonard Crestez 2019-09-30 12:43 ` Leonard Crestez 2019-09-30 21:21 ` Chanwoo Choi 2019-09-30 21:21 ` Chanwoo Choi 2019-09-24 10:11 ` [PATCH v8 6/6] PM / devfreq: Use PM QoS for sysfs min/max_freq Leonard Crestez 2019-09-24 10:11 ` Leonard Crestez 2019-09-25 2:41 ` Chanwoo Choi 2019-09-25 2:41 ` Chanwoo Choi 2019-09-25 16:45 ` Matthias Kaehlcke 2019-09-25 16:45 ` Matthias Kaehlcke 2019-09-26 1:25 ` Chanwoo Choi 2019-09-26 1:25 ` Chanwoo Choi 2019-09-26 16:04 ` Matthias Kaehlcke 2019-09-26 16:04 ` Matthias Kaehlcke 2019-09-27 1:58 ` Chanwoo Choi 2019-09-27 1:58 ` Chanwoo Choi 2019-09-25 22:11 ` Leonard Crestez 2019-09-25 22:11 ` Leonard Crestez 2019-09-26 1:26 ` Chanwoo Choi 2019-09-26 1:26 ` Chanwoo Choi 2019-09-25 1:44 ` [PATCH v8 0/6] PM / devfreq: Add dev_pm_qos support Chanwoo Choi 2019-09-25 1:44 ` Chanwoo Choi 2019-09-25 19:37 ` Leonard Crestez 2019-09-25 19:37 ` Leonard Crestez [not found] ` <CGME20190924101139epcas1p4c6799a5de9bdb4e90abb74de1e881388@epcms1p4> 2019-09-25 1:58 ` [PATCH v8 2/6] PM / devfreq: Move more initialization before registration MyungJoo Ham 2019-09-25 1:58 ` MyungJoo Ham 2019-09-25 19:33 ` Leonard Crestez 2019-09-25 19:33 ` Leonard Crestez
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