This is a note to let you know that I've just added the patch titled
ptp: Replace timestamp event queue with linked list
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ptp-replace-timestamp-event-queue-with-linked-list.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit f1a224315c4ce57c28eb4d157062f342bc25250e
Author: Xabier Marquiegui <reibax@xxxxxxxxx>
Date: Thu Oct 12 00:39:54 2023 +0200
ptp: Replace timestamp event queue with linked list
[ Upstream commit d26ab5a35ad9920940a9e07665130d501b2ae1a3 ]
Introduce linked lists to access the timestamp event queue.
Signed-off-by: Xabier Marquiegui <reibax@xxxxxxxxx>
Suggested-by: Richard Cochran <richardcochran@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Stable-dep-of: 19ae40f572a9 ("ptp: Properly handle compat ioctls")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c
index 2776f37713123..82b5a68d1ca34 100644
--- a/drivers/ptp/ptp_chardev.c
+++ b/drivers/ptp/ptp_chardev.c
@@ -437,10 +437,14 @@ __poll_t ptp_poll(struct posix_clock_context *pccontext, struct file *fp,
{
struct ptp_clock *ptp =
container_of(pccontext->clk, 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 */
+ queue = list_first_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))
@@ -450,12 +454,16 @@ ssize_t ptp_read(struct posix_clock_context *pccontext, uint rdflags,
{
struct ptp_clock *ptp =
container_of(pccontext->clk, 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 */
+ 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 25e37c2bc672b..ff40f902f706f 100644
--- a/drivers/ptp/ptp_clock.c
+++ b/drivers/ptp/ptp_clock.c
@@ -170,12 +170,21 @@ static struct posix_clock_operations ptp_clock_ops = {
static void ptp_clock_release(struct device *dev)
{
struct ptp_clock *ptp = container_of(dev, struct ptp_clock, dev);
+ struct timestamp_event_queue *tsevq;
+ unsigned long flags;
ptp_cleanup_pin_groups(ptp);
kfree(ptp->vclock_index);
mutex_destroy(&ptp->tsevq_mux);
mutex_destroy(&ptp->pincfg_mux);
mutex_destroy(&ptp->n_vclocks_mux);
+ /* Delete first entry */
+ tsevq = list_first_entry(&ptp->tsevqs, struct timestamp_event_queue,
+ qlist);
+ spin_lock_irqsave(&tsevq->lock, flags);
+ list_del(&tsevq->qlist);
+ spin_unlock_irqrestore(&tsevq->lock, flags);
+ kfree(tsevq);
ida_free(&ptp_clocks_map, ptp->index);
kfree(ptp);
}
@@ -199,6 +208,7 @@ 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;
@@ -221,7 +231,12 @@ 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);
mutex_init(&ptp->tsevq_mux);
mutex_init(&ptp->pincfg_mux);
mutex_init(&ptp->n_vclocks_mux);
@@ -311,6 +326,9 @@ 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);
+ list_del(&queue->qlist);
+ kfree(queue);
+no_memory_queue:
ida_free(&ptp_clocks_map, index);
no_slot:
kfree(ptp);
@@ -353,6 +371,7 @@ 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) {
@@ -361,7 +380,10 @@ 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 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 ed6bf42fba86d..a469623f22751 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 be58d5257bcb6..2b2caca45a7d7 100644
--- a/drivers/ptp/ptp_sysfs.c
+++ b/drivers/ptp/ptp_sysfs.c
@@ -64,12 +64,16 @@ 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))
