From: William Breathitt Gray <vilhelm.gray@gmail.com> To: jic23@kernel.org Cc: linux-stm32@st-md-mailman.stormreply.com, kernel@pengutronix.de, a.fatoum@pengutronix.de, kamel.bouhara@bootlin.com, gwendal@chromium.org, alexandre.belloni@bootlin.com, david@lechnology.com, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, syednwaris@gmail.com, patrick.havelange@essensium.com, fabrice.gasnier@st.com, mcoquelin.stm32@gmail.com, alexandre.torgue@st.com, o.rempel@pengutronix.de, jarkko.nikula@linux.intel.com, William Breathitt Gray <vilhelm.gray@gmail.com> Subject: [PATCH v17 7/9] counter: Implement events_queue_size sysfs attribute Date: Wed, 29 Sep 2021 12:16:04 +0900 [thread overview] Message-ID: <c914b2db2ea0a2637633bcc3e86ded3c94783f2e.1632884256.git.vilhelm.gray@gmail.com> (raw) In-Reply-To: <cover.1632884256.git.vilhelm.gray@gmail.com> The events_queue_size sysfs attribute provides a way for users to dynamically configure the Counter events queue size for the Counter character device interface. The size is in number of struct counter_event data structures. The number of elements will be rounded-up to a power of 2 due to a requirement of the kfifo_alloc function called during reallocation of the queue. Cc: Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> --- Documentation/ABI/testing/sysfs-bus-counter | 8 ++++ drivers/counter/counter-sysfs.c | 45 +++++++++++++++++++++ 2 files changed, 53 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-counter b/Documentation/ABI/testing/sysfs-bus-counter index 0ce16669157e..06c2b3e27e0b 100644 --- a/Documentation/ABI/testing/sysfs-bus-counter +++ b/Documentation/ABI/testing/sysfs-bus-counter @@ -233,6 +233,14 @@ Description: shorter or equal to configured value are ignored. Value 0 means filter is disabled. +What: /sys/bus/counter/devices/counterX/events_queue_size +KernelVersion: 5.16 +Contact: linux-iio@vger.kernel.org +Description: + Size of the Counter events queue in number of struct + counter_event data structures. The number of elements will be + rounded-up to a power of 2. + What: /sys/bus/counter/devices/counterX/name KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org diff --git a/drivers/counter/counter-sysfs.c b/drivers/counter/counter-sysfs.c index 97d8d7c2a2b6..1ccd771da25f 100644 --- a/drivers/counter/counter-sysfs.c +++ b/drivers/counter/counter-sysfs.c @@ -3,11 +3,13 @@ * Generic Counter sysfs interface * Copyright (C) 2020 William Breathitt Gray */ +#include <linux/atomic.h> #include <linux/counter.h> #include <linux/device.h> #include <linux/err.h> #include <linux/gfp.h> #include <linux/kernel.h> +#include <linux/kfifo.h> #include <linux/kstrtox.h> #include <linux/list.h> #include <linux/string.h> @@ -783,12 +785,49 @@ static int counter_num_counts_read(struct counter_device *counter, u8 *val) return 0; } +static int counter_events_queue_size_read(struct counter_device *counter, + u64 *val) +{ + *val = kfifo_size(&counter->events); + return 0; +} + +static int counter_events_queue_size_write(struct counter_device *counter, + u64 val) +{ + DECLARE_KFIFO_PTR(events, struct counter_event); + int err = 0; + + /* Ensure chrdev is not opened more than 1 at a time */ + if (!atomic_add_unless(&counter->chrdev_lock, 1, 1)) + return -EBUSY; + + /* Allocate new events queue */ + err = kfifo_alloc(&events, val, GFP_KERNEL); + if (err) + goto exit_early; + + /* Swap in new events queue */ + kfifo_free(&counter->events); + counter->events.kfifo = events.kfifo; + +exit_early: + atomic_dec(&counter->chrdev_lock); + + return err; +} + static struct counter_comp counter_num_signals_comp = COUNTER_COMP_DEVICE_U8("num_signals", counter_num_signals_read, NULL); static struct counter_comp counter_num_counts_comp = COUNTER_COMP_DEVICE_U8("num_counts", counter_num_counts_read, NULL); +static struct counter_comp counter_events_queue_size_comp = + COUNTER_COMP_DEVICE_U64("events_queue_size", + counter_events_queue_size_read, + counter_events_queue_size_write); + static int counter_sysfs_attr_add(struct counter_device *const counter, struct counter_attribute_group *cattr_group) { @@ -827,6 +866,12 @@ static int counter_sysfs_attr_add(struct counter_device *const counter, if (err < 0) return err; + /* Create events_queue_size attribute */ + err = counter_attr_create(dev, cattr_group, + &counter_events_queue_size_comp, scope, NULL); + if (err < 0) + return err; + /* Create an attribute for each extension */ for (i = 0; i < counter->num_ext; i++) { ext = &counter->ext[i]; -- 2.33.0
WARNING: multiple messages have this Message-ID (diff)
From: William Breathitt Gray <vilhelm.gray@gmail.com> To: jic23@kernel.org Cc: linux-stm32@st-md-mailman.stormreply.com, kernel@pengutronix.de, a.fatoum@pengutronix.de, kamel.bouhara@bootlin.com, gwendal@chromium.org, alexandre.belloni@bootlin.com, david@lechnology.com, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, syednwaris@gmail.com, patrick.havelange@essensium.com, fabrice.gasnier@st.com, mcoquelin.stm32@gmail.com, alexandre.torgue@st.com, o.rempel@pengutronix.de, jarkko.nikula@linux.intel.com, William Breathitt Gray <vilhelm.gray@gmail.com> Subject: [PATCH v17 7/9] counter: Implement events_queue_size sysfs attribute Date: Wed, 29 Sep 2021 12:16:04 +0900 [thread overview] Message-ID: <c914b2db2ea0a2637633bcc3e86ded3c94783f2e.1632884256.git.vilhelm.gray@gmail.com> (raw) In-Reply-To: <cover.1632884256.git.vilhelm.gray@gmail.com> The events_queue_size sysfs attribute provides a way for users to dynamically configure the Counter events queue size for the Counter character device interface. The size is in number of struct counter_event data structures. The number of elements will be rounded-up to a power of 2 due to a requirement of the kfifo_alloc function called during reallocation of the queue. Cc: Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> --- Documentation/ABI/testing/sysfs-bus-counter | 8 ++++ drivers/counter/counter-sysfs.c | 45 +++++++++++++++++++++ 2 files changed, 53 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-counter b/Documentation/ABI/testing/sysfs-bus-counter index 0ce16669157e..06c2b3e27e0b 100644 --- a/Documentation/ABI/testing/sysfs-bus-counter +++ b/Documentation/ABI/testing/sysfs-bus-counter @@ -233,6 +233,14 @@ Description: shorter or equal to configured value are ignored. Value 0 means filter is disabled. +What: /sys/bus/counter/devices/counterX/events_queue_size +KernelVersion: 5.16 +Contact: linux-iio@vger.kernel.org +Description: + Size of the Counter events queue in number of struct + counter_event data structures. The number of elements will be + rounded-up to a power of 2. + What: /sys/bus/counter/devices/counterX/name KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org diff --git a/drivers/counter/counter-sysfs.c b/drivers/counter/counter-sysfs.c index 97d8d7c2a2b6..1ccd771da25f 100644 --- a/drivers/counter/counter-sysfs.c +++ b/drivers/counter/counter-sysfs.c @@ -3,11 +3,13 @@ * Generic Counter sysfs interface * Copyright (C) 2020 William Breathitt Gray */ +#include <linux/atomic.h> #include <linux/counter.h> #include <linux/device.h> #include <linux/err.h> #include <linux/gfp.h> #include <linux/kernel.h> +#include <linux/kfifo.h> #include <linux/kstrtox.h> #include <linux/list.h> #include <linux/string.h> @@ -783,12 +785,49 @@ static int counter_num_counts_read(struct counter_device *counter, u8 *val) return 0; } +static int counter_events_queue_size_read(struct counter_device *counter, + u64 *val) +{ + *val = kfifo_size(&counter->events); + return 0; +} + +static int counter_events_queue_size_write(struct counter_device *counter, + u64 val) +{ + DECLARE_KFIFO_PTR(events, struct counter_event); + int err = 0; + + /* Ensure chrdev is not opened more than 1 at a time */ + if (!atomic_add_unless(&counter->chrdev_lock, 1, 1)) + return -EBUSY; + + /* Allocate new events queue */ + err = kfifo_alloc(&events, val, GFP_KERNEL); + if (err) + goto exit_early; + + /* Swap in new events queue */ + kfifo_free(&counter->events); + counter->events.kfifo = events.kfifo; + +exit_early: + atomic_dec(&counter->chrdev_lock); + + return err; +} + static struct counter_comp counter_num_signals_comp = COUNTER_COMP_DEVICE_U8("num_signals", counter_num_signals_read, NULL); static struct counter_comp counter_num_counts_comp = COUNTER_COMP_DEVICE_U8("num_counts", counter_num_counts_read, NULL); +static struct counter_comp counter_events_queue_size_comp = + COUNTER_COMP_DEVICE_U64("events_queue_size", + counter_events_queue_size_read, + counter_events_queue_size_write); + static int counter_sysfs_attr_add(struct counter_device *const counter, struct counter_attribute_group *cattr_group) { @@ -827,6 +866,12 @@ static int counter_sysfs_attr_add(struct counter_device *const counter, if (err < 0) return err; + /* Create events_queue_size attribute */ + err = counter_attr_create(dev, cattr_group, + &counter_events_queue_size_comp, scope, NULL); + if (err < 0) + return err; + /* Create an attribute for each extension */ for (i = 0; i < counter->num_ext; i++) { ext = &counter->ext[i]; -- 2.33.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-09-29 3:17 UTC|newest] Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-09-29 3:15 [PATCH v17 0/9] Introduce the Counter character device interface William Breathitt Gray 2021-09-29 3:15 ` William Breathitt Gray 2021-09-29 3:15 ` [PATCH v17 1/9] counter: Move counter enums to uapi header William Breathitt Gray 2021-09-29 3:15 ` William Breathitt Gray 2021-09-29 3:15 ` [PATCH v17 2/9] counter: Add character device interface William Breathitt Gray 2021-09-29 3:15 ` William Breathitt Gray 2021-10-17 13:50 ` Greg KH 2021-10-17 13:50 ` Greg KH 2021-10-17 14:02 ` Alexandre Belloni 2021-10-17 14:02 ` Alexandre Belloni 2021-10-17 14:40 ` Greg KH 2021-10-17 14:40 ` Greg KH 2021-10-17 15:35 ` Alexandre Belloni 2021-10-17 15:35 ` Alexandre Belloni 2021-09-29 3:16 ` [PATCH v17 3/9] docs: counter: Document " William Breathitt Gray 2021-09-29 3:16 ` William Breathitt Gray 2021-09-29 3:16 ` [PATCH v17 4/9] tools/counter: Create Counter tools William Breathitt Gray 2021-09-29 3:16 ` William Breathitt Gray 2021-09-29 3:16 ` [PATCH v17 5/9] counter: Implement signalZ_action_component_id sysfs attribute William Breathitt Gray 2021-09-29 3:16 ` William Breathitt Gray 2021-10-17 13:51 ` Greg KH 2021-10-17 13:51 ` Greg KH 2021-09-29 3:16 ` [PATCH v17 6/9] counter: Implement *_component_id sysfs attributes William Breathitt Gray 2021-09-29 3:16 ` William Breathitt Gray 2021-09-29 3:16 ` William Breathitt Gray [this message] 2021-09-29 3:16 ` [PATCH v17 7/9] counter: Implement events_queue_size sysfs attribute William Breathitt Gray 2021-09-29 3:16 ` [PATCH v17 8/9] counter: 104-quad-8: Replace mutex with spinlock William Breathitt Gray 2021-09-29 3:16 ` William Breathitt Gray 2021-09-29 3:16 ` [PATCH v17 9/9] counter: 104-quad-8: Add IRQ support for the ACCES 104-QUAD-8 William Breathitt Gray 2021-09-29 3:16 ` William Breathitt Gray 2021-09-30 17:21 ` [PATCH v17 0/9] Introduce the Counter character device interface Jonathan Cameron 2021-09-30 17:21 ` Jonathan Cameron
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