From 63ef91f24f9bfc70b6446319f6cabfd094481372 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Tue, 30 Jun 2020 11:05:46 +0100 Subject: PM / devfreq: rk3399_dmc: Fix kernel oops when rockchip,pmu is absent Booting a recent kernel on a rk3399-based system (nanopc-t4), equipped with a recent u-boot and ATF results in an Oops due to a NULL pointer dereference. This turns out to be due to the rk3399-dmc driver looking for an *undocumented* property (rockchip,pmu), and happily using a NULL pointer when the property isn't there. Instead, make most of what was brought in with 9173c5ceb035 ("PM / devfreq: rk3399_dmc: Pass ODT and auto power down parameters to TF-A.") conditioned on finding this property in the device-tree, preventing the driver from exploding. Cc: stable@vger.kernel.org Fixes: 9173c5ceb035 ("PM / devfreq: rk3399_dmc: Pass ODT and auto power down parameters to TF-A.") Signed-off-by: Marc Zyngier Signed-off-by: Chanwoo Choi --- drivers/devfreq/rk3399_dmc.c | 42 +++++++++++++++++++++++------------------- 1 file changed, 23 insertions(+), 19 deletions(-) diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c index 24f04f78285b..027769e39f9b 100644 --- a/drivers/devfreq/rk3399_dmc.c +++ b/drivers/devfreq/rk3399_dmc.c @@ -95,18 +95,20 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq, mutex_lock(&dmcfreq->lock); - if (target_rate >= dmcfreq->odt_dis_freq) - odt_enable = true; - - /* - * This makes a SMC call to the TF-A to set the DDR PD (power-down) - * timings and to enable or disable the ODT (on-die termination) - * resistors. - */ - arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, dmcfreq->odt_pd_arg0, - dmcfreq->odt_pd_arg1, - ROCKCHIP_SIP_CONFIG_DRAM_SET_ODT_PD, - odt_enable, 0, 0, 0, &res); + if (dmcfreq->regmap_pmu) { + if (target_rate >= dmcfreq->odt_dis_freq) + odt_enable = true; + + /* + * This makes a SMC call to the TF-A to set the DDR PD + * (power-down) timings and to enable or disable the + * ODT (on-die termination) resistors. + */ + arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, dmcfreq->odt_pd_arg0, + dmcfreq->odt_pd_arg1, + ROCKCHIP_SIP_CONFIG_DRAM_SET_ODT_PD, + odt_enable, 0, 0, 0, &res); + } /* * If frequency scaling from low to high, adjust voltage first. @@ -371,13 +373,14 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev) } node = of_parse_phandle(np, "rockchip,pmu", 0); - if (node) { - data->regmap_pmu = syscon_node_to_regmap(node); - of_node_put(node); - if (IS_ERR(data->regmap_pmu)) { - ret = PTR_ERR(data->regmap_pmu); - goto err_edev; - } + if (!node) + goto no_pmu; + + data->regmap_pmu = syscon_node_to_regmap(node); + of_node_put(node); + if (IS_ERR(data->regmap_pmu)) { + ret = PTR_ERR(data->regmap_pmu); + goto err_edev; } regmap_read(data->regmap_pmu, RK3399_PMUGRF_OS_REG2, &val); @@ -399,6 +402,7 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev) goto err_edev; }; +no_pmu: arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, 0, 0, ROCKCHIP_SIP_CONFIG_DRAM_INIT, 0, 0, 0, 0, &res); -- cgit From ada795966a9ff7da2d5b4cd66dd5e1e17edd28a5 Mon Sep 17 00:00:00 2001 From: Kieran Bingham Date: Tue, 9 Jun 2020 13:46:05 +0100 Subject: PM / devfreq: event: Fix trivial spelling The word 'descriptor' is misspelled throughout the tree. Fix it up accordingly: decriptors -> descriptors Signed-off-by: Kieran Bingham Signed-off-by: Chanwoo Choi --- drivers/devfreq/devfreq-event.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/devfreq/devfreq-event.c b/drivers/devfreq/devfreq-event.c index 8c31b0f2e28f..56efbeb7851e 100644 --- a/drivers/devfreq/devfreq-event.c +++ b/drivers/devfreq/devfreq-event.c @@ -293,7 +293,7 @@ static void devfreq_event_release_edev(struct device *dev) /** * devfreq_event_add_edev() - Add new devfreq-event device. * @dev : the device owning the devfreq-event device being created - * @desc : the devfreq-event device's decriptor which include essential + * @desc : the devfreq-event device's descriptor which include essential * data for devfreq-event device. * * Note that this function add new devfreq-event device to devfreq-event class @@ -385,7 +385,7 @@ static void devm_devfreq_event_release(struct device *dev, void *res) /** * devm_devfreq_event_add_edev() - Resource-managed devfreq_event_add_edev() * @dev : the device owning the devfreq-event device being created - * @desc : the devfreq-event device's decriptor which include essential + * @desc : the devfreq-event device's descriptor which include essential * data for devfreq-event device. * * Note that this function manages automatically the memory of devfreq-event -- cgit From 24948479be8b99b97996afd96c0d48e3263d9693 Mon Sep 17 00:00:00 2001 From: Dmitry Osipenko Date: Fri, 3 Jul 2020 09:43:06 +0900 Subject: PM / devfreq: tegra: Add Dmitry as a maintainer I was contributing to the NVIDIA Tegra20+ devfreq drivers recently and want to help keep them working and evolving in the future. Acked-by: Chanwoo Choi Signed-off-by: Dmitry Osipenko Signed-off-by: Chanwoo Choi --- MAINTAINERS | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index f0569cf304ca..85d7fb9f04c8 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -11097,6 +11097,15 @@ F: Documentation/core-api/boot-time-mm.rst F: include/linux/memblock.h F: mm/memblock.c +MEMORY FREQUENCY SCALING DRIVERS FOR NVIDIA TEGRA +M: Dmitry Osipenko +L: linux-pm@vger.kernel.org +L: linux-tegra@vger.kernel.org +T: git git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux.git +S: Maintained +F: drivers/devfreq/tegra20-devfreq.c +F: drivers/devfreq/tegra30-devfreq.c + MEMORY MANAGEMENT M: Andrew Morton L: linux-mm@kvack.org -- cgit From ed279529754d0c94115de5317e369d25468547c9 Mon Sep 17 00:00:00 2001 From: Enric Balletbo i Serra Date: Thu, 9 Jul 2020 11:05:29 +0200 Subject: dt-bindings: devfreq: rk3399_dmc: Add rockchip,pmu phandle MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The Rockchip DMC (Dynamic Memory Interface) needs to access to the PMU general register files to know the DRAM type, so add a phandle to the syscon that manages these registers. Signed-off-by: Enric Balletbo i Serra Reviewed-by: Chanwoo Choi Acked-by: Rob Herring Signed-off-by: Gaël PORTAY Acked-by: MyungJoo Ham Signed-off-by: Chanwoo Choi --- Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt index 0ec68141f85a..a10d1f6d85c6 100644 --- a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt +++ b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt @@ -18,6 +18,8 @@ Optional properties: format depends on the interrupt controller. It should be a DCF interrupt. When DDR DVFS finishes a DCF interrupt is triggered. +- rockchip,pmu: Phandle to the syscon managing the "PMU general register + files". Following properties relate to DDR timing: -- cgit From 4dc3bab8687f1ea11322611de6d4138b43eccdcd Mon Sep 17 00:00:00 2001 From: Chanwoo Choi Date: Thu, 2 Jul 2020 20:41:28 +0900 Subject: PM / devfreq: Add support delayed timer for polling mode Until now, the devfreq driver using polling mode like simple_ondemand governor have used only deferrable timer for reducing the redundant power consumption. It reduces the CPU wake-up from idle due to polling mode which check the status of Non-CPU device. But, it has a problem for Non-CPU device like DMC device with DMA operation. Some Non-CPU device need to do monitor continuously regardless of CPU state in order to decide the proper next status of Non-CPU device. So, add support the delayed timer for polling mode to support the repetitive monitoring. The devfreq driver and user can select the kind of timer on either deferrable and delayed timer. For example, change the timer type of DMC device based on Exynos5422-based Odroid-XU3 as following: - If want to use deferrable timer as following: echo deferrable > /sys/class/devfreq/10c20000.memory-controller/timer - If want to use delayed timer as following: echo delayed > /sys/class/devfreq/10c20000.memory-controller/timer Reviewed-by: Bartlomiej Zolnierkiewicz Reviewed-by: Lukasz Luba Signed-off-by: Chanwoo Choi --- Documentation/ABI/testing/sysfs-class-devfreq | 12 ++++ drivers/devfreq/devfreq.c | 86 ++++++++++++++++++++++++++- include/linux/devfreq.h | 9 +++ 3 files changed, 106 insertions(+), 1 deletion(-) diff --git a/Documentation/ABI/testing/sysfs-class-devfreq b/Documentation/ABI/testing/sysfs-class-devfreq index 9758eb85ade3..deefffb3bbe4 100644 --- a/Documentation/ABI/testing/sysfs-class-devfreq +++ b/Documentation/ABI/testing/sysfs-class-devfreq @@ -108,3 +108,15 @@ Description: frequency requested by governors and min_freq. The max_freq overrides min_freq because max_freq may be used to throttle devices to avoid overheating. + +What: /sys/class/devfreq/.../timer +Date: July 2020 +Contact: Chanwoo Choi +Description: + This ABI shows and stores the kind of work timer by users. + This work timer is used by devfreq workqueue in order to + monitor the device status such as utilization. The user + can change the work timer on runtime according to their demand + as following: + echo deferrable > /sys/class/devfreq/.../timer + echo delayed > /sys/class/devfreq/.../timer diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 52b9c3e141f3..5320c3b37f35 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -49,6 +49,11 @@ static LIST_HEAD(devfreq_governor_list); static LIST_HEAD(devfreq_list); static DEFINE_MUTEX(devfreq_list_lock); +static const char timer_name[][DEVFREQ_NAME_LEN] = { + [DEVFREQ_TIMER_DEFERRABLE] = { "deferrable" }, + [DEVFREQ_TIMER_DELAYED] = { "delayed" }, +}; + /** * find_device_devfreq() - find devfreq struct using device pointer * @dev: device pointer used to lookup device devfreq. @@ -454,7 +459,17 @@ void devfreq_monitor_start(struct devfreq *devfreq) if (devfreq->governor->interrupt_driven) return; - INIT_DEFERRABLE_WORK(&devfreq->work, devfreq_monitor); + switch (devfreq->profile->timer) { + case DEVFREQ_TIMER_DEFERRABLE: + INIT_DEFERRABLE_WORK(&devfreq->work, devfreq_monitor); + break; + case DEVFREQ_TIMER_DELAYED: + INIT_DELAYED_WORK(&devfreq->work, devfreq_monitor); + break; + default: + return; + } + if (devfreq->profile->polling_ms) queue_delayed_work(devfreq_wq, &devfreq->work, msecs_to_jiffies(devfreq->profile->polling_ms)); @@ -771,6 +786,11 @@ struct devfreq *devfreq_add_device(struct device *dev, devfreq->data = data; devfreq->nb.notifier_call = devfreq_notifier_call; + if (devfreq->profile->timer < 0 + || devfreq->profile->timer >= DEVFREQ_TIMER_NUM) { + goto err_out; + } + if (!devfreq->profile->max_state && !devfreq->profile->freq_table) { mutex_unlock(&devfreq->lock); err = set_freq_table(devfreq); @@ -1625,6 +1645,69 @@ static ssize_t trans_stat_store(struct device *dev, } static DEVICE_ATTR_RW(trans_stat); +static ssize_t timer_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct devfreq *df = to_devfreq(dev); + + if (!df->profile) + return -EINVAL; + + return sprintf(buf, "%s\n", timer_name[df->profile->timer]); +} + +static ssize_t timer_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct devfreq *df = to_devfreq(dev); + char str_timer[DEVFREQ_NAME_LEN + 1]; + int timer = -1; + int ret = 0, i; + + if (!df->governor || !df->profile) + return -EINVAL; + + ret = sscanf(buf, "%16s", str_timer); + if (ret != 1) + return -EINVAL; + + for (i = 0; i < DEVFREQ_TIMER_NUM; i++) { + if (!strncmp(timer_name[i], str_timer, DEVFREQ_NAME_LEN)) { + timer = i; + break; + } + } + + if (timer < 0) { + ret = -EINVAL; + goto out; + } + + if (df->profile->timer == timer) { + ret = 0; + goto out; + } + + mutex_lock(&df->lock); + df->profile->timer = timer; + mutex_unlock(&df->lock); + + 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_START, NULL); + if (ret) + dev_warn(dev, "%s: Governor %s not started(%d)\n", + __func__, df->governor->name, ret); +out: + return ret ? ret : count; +} +static DEVICE_ATTR_RW(timer); + static struct attribute *devfreq_attrs[] = { &dev_attr_name.attr, &dev_attr_governor.attr, @@ -1636,6 +1719,7 @@ static struct attribute *devfreq_attrs[] = { &dev_attr_min_freq.attr, &dev_attr_max_freq.attr, &dev_attr_trans_stat.attr, + &dev_attr_timer.attr, NULL, }; ATTRIBUTE_GROUPS(devfreq); diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h index 57e871a559a9..12782fbb4c25 100644 --- a/include/linux/devfreq.h +++ b/include/linux/devfreq.h @@ -31,6 +31,13 @@ #define DEVFREQ_PRECHANGE (0) #define DEVFREQ_POSTCHANGE (1) +/* DEVFREQ work timers */ +enum devfreq_timer { + DEVFREQ_TIMER_DEFERRABLE = 0, + DEVFREQ_TIMER_DELAYED, + DEVFREQ_TIMER_NUM, +}; + struct devfreq; struct devfreq_governor; @@ -70,6 +77,7 @@ struct devfreq_dev_status { * @initial_freq: The operating frequency when devfreq_add_device() is * called. * @polling_ms: The polling interval in ms. 0 disables polling. + * @timer: Timer type is either deferrable or delayed timer. * @target: The device should set its operating frequency at * freq or lowest-upper-than-freq value. If freq is * higher than any operable frequency, set maximum. @@ -96,6 +104,7 @@ struct devfreq_dev_status { struct devfreq_dev_profile { unsigned long initial_freq; unsigned int polling_ms; + enum devfreq_timer timer; int (*target)(struct device *dev, unsigned long *freq, u32 flags); int (*get_dev_status)(struct device *dev, -- cgit From ae8eb8ba521c8e72e9e5504765929e55c038ee3a Mon Sep 17 00:00:00 2001 From: Chanwoo Choi Date: Fri, 3 Jul 2020 15:04:50 +0900 Subject: memory: samsung: exynos5422-dmc: Use delayed timer as default Use delayed timer as default instead of deferrable timer in order to monitor the DMC status regardless of CPU idle. Reviewed-by: Krzysztof Kozlowski Reviewed-by: Lukasz Luba Signed-off-by: Chanwoo Choi --- drivers/memory/samsung/exynos5422-dmc.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/memory/samsung/exynos5422-dmc.c b/drivers/memory/samsung/exynos5422-dmc.c index 25196d6268e2..93e9c2429c0d 100644 --- a/drivers/memory/samsung/exynos5422-dmc.c +++ b/drivers/memory/samsung/exynos5422-dmc.c @@ -945,6 +945,7 @@ static int exynos5_dmc_get_cur_freq(struct device *dev, unsigned long *freq) * It provides to the devfreq framework needed functions and polling period. */ static struct devfreq_dev_profile exynos5_dmc_df_profile = { + .timer = DEVFREQ_TIMER_DELAYED, .target = exynos5_dmc_target, .get_dev_status = exynos5_dmc_get_status, .get_cur_freq = exynos5_dmc_get_cur_freq, -- cgit From 74ca9e46107879551e2625bfbfbfd71da1881b82 Mon Sep 17 00:00:00 2001 From: Lukasz Luba Date: Fri, 10 Jul 2020 20:11:21 +0100 Subject: memory: samsung: exynos5422-dmc: Adjust polling interval and uptreshold In order to react faster and make better decisions under some workloads, benchmarking the memory subsystem behavior, adjust the polling interval and upthreshold value used by the simple_ondemand governor. Reported-by: Willy Wolff Reviewed-by: Chanwoo Choi Reviewed-by: Krzysztof Kozlowski Signed-off-by: Lukasz Luba Signed-off-by: Chanwoo Choi --- drivers/memory/samsung/exynos5422-dmc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/memory/samsung/exynos5422-dmc.c b/drivers/memory/samsung/exynos5422-dmc.c index 93e9c2429c0d..e03ee35f0ab5 100644 --- a/drivers/memory/samsung/exynos5422-dmc.c +++ b/drivers/memory/samsung/exynos5422-dmc.c @@ -1466,10 +1466,10 @@ static int exynos5_dmc_probe(struct platform_device *pdev) * Setup default thresholds for the devfreq governor. * The values are chosen based on experiments. */ - dmc->gov_data.upthreshold = 30; + dmc->gov_data.upthreshold = 10; dmc->gov_data.downdifferential = 5; - exynos5_dmc_df_profile.polling_ms = 500; + exynos5_dmc_df_profile.polling_ms = 100; } -- cgit From 4fc9a0470d2dc370289e9d883feb41e5dd2c6303 Mon Sep 17 00:00:00 2001 From: Lukasz Luba Date: Fri, 10 Jul 2020 20:11:22 +0100 Subject: memory: samsung: exynos5422-dmc: Add module param to control IRQ mode The driver can operate in two modes relaying on devfreq monitoring mechanism which periodically checks the device status or it can use interrupts when they are provided by loaded Device Tree. The newly introduced module parameter can be used to choose between devfreq monitoring and internal interrupts without modifying the Device Tree. It also sets devfreq monitoring as default when the parameter is not set (also the case for default when the driver is not built as a module). Reported-by: Willy Wolff Reviewed-by: Krzysztof Kozlowski Signed-off-by: Lukasz Luba Signed-off-by: Chanwoo Choi --- drivers/memory/samsung/exynos5422-dmc.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/memory/samsung/exynos5422-dmc.c b/drivers/memory/samsung/exynos5422-dmc.c index e03ee35f0ab5..53bfe6b7b703 100644 --- a/drivers/memory/samsung/exynos5422-dmc.c +++ b/drivers/memory/samsung/exynos5422-dmc.c @@ -12,6 +12,7 @@ #include #include #include +#include #include #include #include @@ -21,6 +22,10 @@ #include "../jedec_ddr.h" #include "../of_memory.h" +static int irqmode; +module_param(irqmode, int, 0644); +MODULE_PARM_DESC(irqmode, "Enable IRQ mode (0=off [default], 1=on)"); + #define EXYNOS5_DREXI_TIMINGAREF (0x0030) #define EXYNOS5_DREXI_TIMINGROW0 (0x0034) #define EXYNOS5_DREXI_TIMINGDATA0 (0x0038) @@ -1428,7 +1433,7 @@ static int exynos5_dmc_probe(struct platform_device *pdev) /* There is two modes in which the driver works: polling or IRQ */ irq[0] = platform_get_irq_byname(pdev, "drex_0"); irq[1] = platform_get_irq_byname(pdev, "drex_1"); - if (irq[0] > 0 && irq[1] > 0) { + if (irq[0] > 0 && irq[1] > 0 && irqmode) { ret = devm_request_threaded_irq(dev, irq[0], NULL, dmc_irq_thread, IRQF_ONESHOT, dev_name(dev), dmc); @@ -1485,7 +1490,7 @@ static int exynos5_dmc_probe(struct platform_device *pdev) if (dmc->in_irq_mode) exynos5_dmc_start_perf_events(dmc, PERF_COUNTER_START_VALUE); - dev_info(dev, "DMC initialized\n"); + dev_info(dev, "DMC initialized, in irq mode: %d\n", dmc->in_irq_mode); return 0; -- cgit From 483d557ee9a3df5f21db4e4485705b17ed1a9e1e Mon Sep 17 00:00:00 2001 From: Chanwoo Choi Date: Mon, 13 Jul 2020 17:31:12 +0900 Subject: PM / devfreq: Clean up the devfreq instance name in sysfs attr 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'. Add add the missing conditional statement to prevent the fault. Signed-off-by: Chanwoo Choi --- drivers/devfreq/devfreq.c | 94 ++++++++++++++++++++++++++++++----------------- 1 file changed, 60 insertions(+), 34 deletions(-) diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 5320c3b37f35..286957f760f1 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); @@ -1363,13 +1366,16 @@ static ssize_t available_governors_show(struct device *d, struct devfreq *df = to_devfreq(d); ssize_t count = 0; + if (!df->governor) + return -EINVAL; + mutex_lock(&devfreq_list_lock); /* * The devfreq with immutable governor (e.g., passive) shows * only own governor. */ - if (df->governor && df->governor->immutable) { + if (df->governor->immutable) { count = scnprintf(&buf[count], DEVFREQ_NAME_LEN, "%s ", df->governor_name); /* @@ -1403,27 +1409,37 @@ 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) + return -EINVAL; + + 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); + + if (!df->profile) + return -EINVAL; + + return sprintf(buf, "%d\n", df->profile->polling_ms); } static ssize_t polling_interval_store(struct device *dev, @@ -1551,6 +1567,9 @@ static ssize_t available_frequencies_show(struct device *d, ssize_t count = 0; int i; + if (!df->profile) + return -EINVAL; + mutex_lock(&df->lock); for (i = 0; i < df->profile->max_state; i++) @@ -1571,49 +1590,53 @@ 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; + + if (!df->profile) + return -EINVAL; + 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; } @@ -1624,6 +1647,9 @@ static ssize_t trans_stat_store(struct device *dev, struct devfreq *df = to_devfreq(dev); int err, value; + if (!df->profile) + return -EINVAL; + if (df->profile->max_state == 0) return count; -- cgit From 0aae11bcdefb4894b6100656ad24cbd85ff34b52 Mon Sep 17 00:00:00 2001 From: Chanwoo Choi Date: Thu, 9 Jul 2020 15:51:34 +0900 Subject: PM / devfreq: Fix indentaion of devfreq_summary debugfs node The commit 66d0e797bf09 ("Revert "PM / devfreq: Modify the device name as devfreq(X) for sysfs"") roll back the device name from 'devfreqX' to device name explained in DT. After applied commit 66d0e797bf09, the indentation of devfreq_summary debugfs node was broken. So, fix indentaion of devfreq_summary debugfs node as following: For example on Exynos5422-based Odroid-XU3 board, $ cat /sys/kernel/debug/devfreq/devfreq_summary dev parent_dev governor polling_ms cur_freq_Hz min_freq_Hz max_freq_Hz ------------------------------ ------------------------------ --------------- ---------- ------------ ------------ ------------ 10c20000.memory-controller null simple_ondemand 0 413000000 165000000 825000000 soc:bus_wcore null simple_ondemand 50 88700000 88700000 532000000 soc:bus_noc soc:bus_wcore passive 0 66600000 66600000 111000000 soc:bus_fsys_apb soc:bus_wcore passive 0 111000000 111000000 222000000 soc:bus_fsys soc:bus_wcore passive 0 75000000 75000000 200000000 soc:bus_fsys2 soc:bus_wcore passive 0 75000000 75000000 200000000 soc:bus_mfc soc:bus_wcore passive 0 83250000 83250000 333000000 soc:bus_gen soc:bus_wcore passive 0 88700000 88700000 266000000 soc:bus_peri soc:bus_wcore passive 0 66600000 66600000 66600000 soc:bus_g2d soc:bus_wcore passive 0 83250000 83250000 333000000 soc:bus_g2d_acp soc:bus_wcore passive 0 0 66500000 266000000 soc:bus_jpeg soc:bus_wcore passive 0 0 75000000 300000000 soc:bus_jpeg_apb soc:bus_wcore passive 0 0 83250000 166500000 soc:bus_disp1_fimd soc:bus_wcore passive 0 0 120000000 200000000 soc:bus_disp1 soc:bus_wcore passive 0 0 120000000 300000000 soc:bus_gscl_scaler soc:bus_wcore passive 0 0 150000000 300000000 soc:bus_mscl soc:bus_wcore passive 0 0 84000000 666000000 Cc: stable@vger.kernel.org Fixes: 66d0e797bf09 ("Revert "PM / devfreq: Modify the device name as devfreq(X) for sysfs"") Signed-off-by: Chanwoo Choi --- drivers/devfreq/devfreq.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 286957f760f1..9d324ff87ee6 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -1767,8 +1767,7 @@ static int devfreq_summary_show(struct seq_file *s, void *data) unsigned long cur_freq, min_freq, max_freq; unsigned int polling_ms; - seq_printf(s, "%-30s %-10s %-10s %-15s %10s %12s %12s %12s\n", - "dev_name", + seq_printf(s, "%-30s %-30s %-15s %10s %12s %12s %12s\n", "dev", "parent_dev", "governor", @@ -1776,10 +1775,9 @@ static int devfreq_summary_show(struct seq_file *s, void *data) "cur_freq_Hz", "min_freq_Hz", "max_freq_Hz"); - seq_printf(s, "%30s %10s %10s %15s %10s %12s %12s %12s\n", + seq_printf(s, "%30s %30s %15s %10s %12s %12s %12s\n", + "------------------------------", "------------------------------", - "----------", - "----------", "---------------", "----------", "------------", @@ -1808,8 +1806,7 @@ static int devfreq_summary_show(struct seq_file *s, void *data) mutex_unlock(&devfreq->lock); seq_printf(s, - "%-30s %-10s %-10s %-15s %10d %12ld %12ld %12ld\n", - dev_name(devfreq->dev.parent), + "%-30s %-30s %-15s %10d %12ld %12ld %12ld\n", dev_name(&devfreq->dev), p_devfreq ? dev_name(&p_devfreq->dev) : "null", devfreq->governor_name, -- cgit From 27a69714450f5c9288cec2b20f1ae4f7ad34dacf Mon Sep 17 00:00:00 2001 From: Chanwoo Choi Date: Mon, 27 Jul 2020 11:32:31 +0900 Subject: PM / devfreq: Fix the wrong end with semicolon Fix the wrong grammar at the end of code line by using semicolon. Cc: stable vger.kernel.org Fixes: 490a421bc575 ("PM / devfreq: Add debugfs support with devfreq_summary file") Signed-off-by: Chanwoo Choi --- drivers/devfreq/devfreq.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 9d324ff87ee6..561d91b2d3bf 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -1800,9 +1800,9 @@ static int devfreq_summary_show(struct seq_file *s, void *data) #endif mutex_lock(&devfreq->lock); - cur_freq = devfreq->previous_freq, + cur_freq = devfreq->previous_freq; get_freq_range(devfreq, &min_freq, &max_freq); - polling_ms = devfreq->profile->polling_ms, + polling_ms = devfreq->profile->polling_ms; mutex_unlock(&devfreq->lock); seq_printf(s, -- cgit