diff options
author | Xabier Marquiegui <reibax@gmail.com> | 2023-10-12 01:39:57 +0300 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2023-10-15 22:07:52 +0300 |
commit | 403376ddb4221be9db5326ae334773807df71ffe (patch) | |
tree | 027d7c1055733aecd925d4941b8a7d90296e57f6 /drivers/ptp/ptp_chardev.c | |
parent | c5a445b1e9347b14752b01f1a304bd7a2f260acc (diff) | |
download | linux-403376ddb4221be9db5326ae334773807df71ffe.tar.xz |
ptp: add debugfs interface to see applied channel masks
Use debugfs to be able to view channel mask applied to every timestamp
event queue.
Every time the device is opened, a new entry is created in
`$DEBUGFS_MOUNTPOINT/ptpN/$INSTANCE_ADDRESS/mask`.
The mask value can be viewed grouped in 32bit decimal values using cat,
or converted to hexadecimal with the included `ptpchmaskfmt.sh` script.
32 bit values are listed from least significant to most significant.
Signed-off-by: Xabier Marquiegui <reibax@gmail.com>
Suggested-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/ptp/ptp_chardev.c')
-rw-r--r-- | drivers/ptp/ptp_chardev.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c index ac2f2b5ea0b7..282cd7d24077 100644 --- a/drivers/ptp/ptp_chardev.c +++ b/drivers/ptp/ptp_chardev.c @@ -10,6 +10,7 @@ #include <linux/sched.h> #include <linux/slab.h> #include <linux/timekeeping.h> +#include <linux/debugfs.h> #include <linux/nospec.h> @@ -106,6 +107,7 @@ int ptp_open(struct posix_clock_context *pccontext, fmode_t fmode) struct ptp_clock *ptp = container_of(pccontext->clk, struct ptp_clock, clock); struct timestamp_event_queue *queue; + char debugfsname[32]; queue = kzalloc(sizeof(*queue), GFP_KERNEL); if (!queue) @@ -119,6 +121,17 @@ int ptp_open(struct posix_clock_context *pccontext, fmode_t fmode) spin_lock_init(&queue->lock); list_add_tail(&queue->qlist, &ptp->tsevqs); pccontext->private_clkdata = queue; + + /* Debugfs contents */ + sprintf(debugfsname, "0x%p", queue); + queue->debugfs_instance = + debugfs_create_dir(debugfsname, ptp->debugfs_root); + queue->dfs_bitmap.array = (u32 *)queue->mask; + queue->dfs_bitmap.n_elements = + DIV_ROUND_UP(PTP_MAX_CHANNELS, BITS_PER_BYTE * sizeof(u32)); + debugfs_create_u32_array("mask", 0444, queue->debugfs_instance, + &queue->dfs_bitmap); + return 0; } @@ -128,6 +141,7 @@ int ptp_release(struct posix_clock_context *pccontext) unsigned long flags; if (queue) { + debugfs_remove(queue->debugfs_instance); pccontext->private_clkdata = NULL; spin_lock_irqsave(&queue->lock, flags); list_del(&queue->qlist); |