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Message-Id: <20230928133544.3642650-2-reibax@gmail.com>
Date: Thu, 28 Sep 2023 15:35:42 +0200
From: Xabier Marquiegui <reibax@...il.com>
To: netdev@...r.kernel.org
Cc: richardcochran@...il.com,
horms@...nel.org,
chrony-dev@...ony.tuxfamily.org,
mlichvar@...hat.com,
reibax@...il.com,
ntp-lists@...tcorallo.com,
vinicius.gomes@...el.com,
alex.maftei@....com,
davem@...emloft.net,
rrameshbabu@...dia.com,
shuah@...nel.org
Subject: [PATCH net-next v3 1/3] ptp: Replace timestamp event queue with linked list
Introduce linked lists to access the timestamp event queue.
Signed-off-by: Xabier Marquiegui <reibax@...il.com>
Suggested-by: Richard Cochran <richardcochran@...il.com>
---
v3:
- fix use of safe and non safe linked lists for loops
v2: https://lore.kernel.org/netdev/20230912220217.2008895-1-reibax@gmail.com/
- Style changes to comform to checkpatch strict suggestions
v1: https://lore.kernel.org/netdev/20230906104754.1324412-2-reibax@gmail.com/
drivers/ptp/ptp_chardev.c | 16 ++++++++++++++--
drivers/ptp/ptp_clock.c | 30 ++++++++++++++++++++++++++++--
drivers/ptp/ptp_private.h | 4 +++-
drivers/ptp/ptp_sysfs.c | 6 +++++-
4 files changed, 50 insertions(+), 6 deletions(-)
diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c
index 362bf756e6b7..197edf1179f1 100644
--- a/drivers/ptp/ptp_chardev.c
+++ b/drivers/ptp/ptp_chardev.c
@@ -435,10 +435,16 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
__poll_t ptp_poll(struct posix_clock *pc, struct file *fp, poll_table *wait)
{
struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
+ struct timestamp_event_queue *queue;
poll_wait(fp, &ptp->tsev_wq, wait);
- return queue_cnt(&ptp->tsevq) ? EPOLLIN : 0;
+ /* Extract only the first element in the queue list
+ * TODO: Identify the relevant queue
+ */
+ queue = list_entry(&ptp->tsevqs, struct timestamp_event_queue, qlist);
+
+ return queue_cnt(queue) ? EPOLLIN : 0;
}
#define EXTTS_BUFSIZE (PTP_BUF_TIMESTAMPS * sizeof(struct ptp_extts_event))
@@ -447,12 +453,18 @@ ssize_t ptp_read(struct posix_clock *pc,
uint rdflags, char __user *buf, size_t cnt)
{
struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
- struct timestamp_event_queue *queue = &ptp->tsevq;
+ struct timestamp_event_queue *queue;
struct ptp_extts_event *event;
unsigned long flags;
size_t qcnt, i;
int result;
+ /* Extract only the first element in the queue list
+ * TODO: Identify the relevant queue
+ */
+ queue = list_first_entry(&ptp->tsevqs, struct timestamp_event_queue,
+ qlist);
+
if (cnt % sizeof(struct ptp_extts_event) != 0)
return -EINVAL;
diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c
index 80f74e38c2da..8996ff500392 100644
--- a/drivers/ptp/ptp_clock.c
+++ b/drivers/ptp/ptp_clock.c
@@ -166,6 +166,18 @@ static struct posix_clock_operations ptp_clock_ops = {
.read = ptp_read,
};
+static void ptp_clean_queue_list(struct ptp_clock *ptp)
+{
+ struct timestamp_event_queue *element;
+ struct list_head *pos, *next;
+
+ list_for_each_safe(pos, next, &ptp->tsevqs) {
+ element = list_entry(pos, struct timestamp_event_queue, qlist);
+ list_del(pos);
+ kfree(element);
+ }
+}
+
static void ptp_clock_release(struct device *dev)
{
struct ptp_clock *ptp = container_of(dev, struct ptp_clock, dev);
@@ -175,6 +187,7 @@ static void ptp_clock_release(struct device *dev)
mutex_destroy(&ptp->tsevq_mux);
mutex_destroy(&ptp->pincfg_mux);
mutex_destroy(&ptp->n_vclocks_mux);
+ ptp_clean_queue_list(ptp);
ida_free(&ptp_clocks_map, ptp->index);
kfree(ptp);
}
@@ -206,6 +219,7 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
struct device *parent)
{
struct ptp_clock *ptp;
+ struct timestamp_event_queue *queue = NULL;
int err = 0, index, major = MAJOR(ptp_devt);
size_t size;
@@ -228,7 +242,13 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
ptp->info = info;
ptp->devid = MKDEV(major, index);
ptp->index = index;
- spin_lock_init(&ptp->tsevq.lock);
+ INIT_LIST_HEAD(&ptp->tsevqs);
+ queue = kzalloc(sizeof(*queue), GFP_KERNEL);
+ if (!queue)
+ goto no_memory_queue;
+ spin_lock_init(&queue->lock);
+ list_add_tail(&queue->qlist, &ptp->tsevqs);
+ /* TODO - Transform or delete this mutex */
mutex_init(&ptp->tsevq_mux);
mutex_init(&ptp->pincfg_mux);
mutex_init(&ptp->n_vclocks_mux);
@@ -333,6 +353,8 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
mutex_destroy(&ptp->tsevq_mux);
mutex_destroy(&ptp->pincfg_mux);
mutex_destroy(&ptp->n_vclocks_mux);
+ ptp_clean_queue_list(ptp);
+no_memory_queue:
ida_free(&ptp_clocks_map, index);
no_slot:
kfree(ptp);
@@ -375,6 +397,7 @@ EXPORT_SYMBOL(ptp_clock_unregister);
void ptp_clock_event(struct ptp_clock *ptp, struct ptp_clock_event *event)
{
+ struct timestamp_event_queue *tsevq;
struct pps_event_time evt;
switch (event->type) {
@@ -383,7 +406,10 @@ void ptp_clock_event(struct ptp_clock *ptp, struct ptp_clock_event *event)
break;
case PTP_CLOCK_EXTTS:
- enqueue_external_timestamp(&ptp->tsevq, event);
+ /* Enqueue timestamp on all other queues */
+ list_for_each_entry(tsevq, &ptp->tsevqs, qlist) {
+ enqueue_external_timestamp(tsevq, event);
+ }
wake_up_interruptible(&ptp->tsev_wq);
break;
diff --git a/drivers/ptp/ptp_private.h b/drivers/ptp/ptp_private.h
index 75f58fc468a7..314c21c39f6a 100644
--- a/drivers/ptp/ptp_private.h
+++ b/drivers/ptp/ptp_private.h
@@ -15,6 +15,7 @@
#include <linux/ptp_clock.h>
#include <linux/ptp_clock_kernel.h>
#include <linux/time.h>
+#include <linux/list.h>
#define PTP_MAX_TIMESTAMPS 128
#define PTP_BUF_TIMESTAMPS 30
@@ -25,6 +26,7 @@ struct timestamp_event_queue {
int head;
int tail;
spinlock_t lock;
+ struct list_head qlist;
};
struct ptp_clock {
@@ -35,7 +37,7 @@ struct ptp_clock {
int index; /* index into clocks.map */
struct pps_device *pps_source;
long dialed_frequency; /* remembers the frequency adjustment */
- struct timestamp_event_queue tsevq; /* simple fifo for time stamps */
+ struct list_head tsevqs; /* timestamp fifo list */
struct mutex tsevq_mux; /* one process at a time reading the fifo */
struct mutex pincfg_mux; /* protect concurrent info->pin_config access */
wait_queue_head_t tsev_wq;
diff --git a/drivers/ptp/ptp_sysfs.c b/drivers/ptp/ptp_sysfs.c
index 6e4d5456a885..2675f383cd0a 100644
--- a/drivers/ptp/ptp_sysfs.c
+++ b/drivers/ptp/ptp_sysfs.c
@@ -75,12 +75,16 @@ static ssize_t extts_fifo_show(struct device *dev,
struct device_attribute *attr, char *page)
{
struct ptp_clock *ptp = dev_get_drvdata(dev);
- struct timestamp_event_queue *queue = &ptp->tsevq;
+ struct timestamp_event_queue *queue;
struct ptp_extts_event event;
unsigned long flags;
size_t qcnt;
int cnt = 0;
+ /* The sysfs fifo will always draw from the fist queue */
+ queue = list_first_entry(&ptp->tsevqs, struct timestamp_event_queue,
+ qlist);
+
memset(&event, 0, sizeof(event));
if (mutex_lock_interruptible(&ptp->tsevq_mux))
--
2.34.1
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