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Date: Mon, 9 Oct 2023 00:49:20 +0200
From: Xabier Marquiegui <reibax@...il.com>
To: netdev@...r.kernel.org
Cc: richardcochran@...il.com,
tglx@...utronix.de,
jstultz@...gle.com,
horms@...nel.org,
chrony-dev@...ony.tuxfamily.org,
mlichvar@...hat.com,
reibax@...il.com,
ntp-lists@...tcorallo.com,
vinicius.gomes@...el.com,
davem@...emloft.net,
rrameshbabu@...dia.com,
shuah@...nel.org
Subject: [PATCH net-next v5 5/6] 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@...il.com>
Suggested-by: Vinicius Costa Gomes <vinicius.gomes@...el.com>
---
v1: https://lore.kernel.org/netdev/27d47d720dfa7a0b5a59b32626ed6d02745b6ee0.1696511486.git.reibax@gmail.com/
- First version
---
drivers/ptp/ptp_chardev.c | 14 ++++++++++++++
drivers/ptp/ptp_clock.c | 7 +++++++
drivers/ptp/ptp_private.h | 4 ++++
tools/testing/selftests/ptp/ptpchmaskfmt.sh | 14 ++++++++++++++
4 files changed, 39 insertions(+)
create mode 100644 tools/testing/selftests/ptp/ptpchmaskfmt.sh
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);
diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c
index ed16d9787ce9..2e801cd33220 100644
--- a/drivers/ptp/ptp_clock.c
+++ b/drivers/ptp/ptp_clock.c
@@ -15,6 +15,7 @@
#include <linux/slab.h>
#include <linux/syscalls.h>
#include <linux/uaccess.h>
+#include <linux/debugfs.h>
#include <uapi/linux/sched/types.h>
#include "ptp_private.h"
@@ -185,6 +186,7 @@ static void ptp_clock_release(struct device *dev)
spin_unlock_irqrestore(&tsevq->lock, flags);
bitmap_free(tsevq->mask);
kfree(tsevq);
+ debugfs_remove(ptp->debugfs_root);
ida_free(&ptp_clocks_map, ptp->index);
kfree(ptp);
}
@@ -218,6 +220,7 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
struct ptp_clock *ptp;
struct timestamp_event_queue *queue = NULL;
int err = 0, index, major = MAJOR(ptp_devt);
+ char debugfsname[8];
size_t size;
if (info->n_alarm > PTP_MAX_ALARMS)
@@ -339,6 +342,10 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
return ERR_PTR(err);
}
+ /* Debugfs initialization */
+ sprintf(debugfsname, "ptp%d", ptp->index);
+ ptp->debugfs_root = debugfs_create_dir(debugfsname, NULL);
+
return ptp;
no_pps:
diff --git a/drivers/ptp/ptp_private.h b/drivers/ptp/ptp_private.h
index ad4ce1b25c86..52f87e394aa6 100644
--- a/drivers/ptp/ptp_private.h
+++ b/drivers/ptp/ptp_private.h
@@ -17,6 +17,7 @@
#include <linux/time.h>
#include <linux/list.h>
#include <linux/bitmap.h>
+#include <linux/debugfs.h>
#define PTP_MAX_TIMESTAMPS 128
#define PTP_BUF_TIMESTAMPS 30
@@ -30,6 +31,8 @@ struct timestamp_event_queue {
spinlock_t lock;
struct list_head qlist;
unsigned long *mask;
+ struct dentry *debugfs_instance;
+ struct debugfs_u32_array dfs_bitmap;
};
struct ptp_clock {
@@ -57,6 +60,7 @@ struct ptp_clock {
struct mutex n_vclocks_mux; /* protect concurrent n_vclocks access */
bool is_virtual_clock;
bool has_cycles;
+ struct dentry *debugfs_root;
};
#define info_to_vclock(d) container_of((d), struct ptp_vclock, info)
diff --git a/tools/testing/selftests/ptp/ptpchmaskfmt.sh b/tools/testing/selftests/ptp/ptpchmaskfmt.sh
new file mode 100644
index 000000000000..0a06ba8af300
--- /dev/null
+++ b/tools/testing/selftests/ptp/ptpchmaskfmt.sh
@@ -0,0 +1,14 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+# Simple helper script to transform ptp debugfs timestamp event queue filtering
+# masks from decimal values to hexadecimal values
+
+# Only takes the debugfs mask file path as an argument
+DEBUGFS_MASKFILE="${1}"
+
+#shellcheck disable=SC2013,SC2086
+for int in $(cat "$DEBUGFS_MASKFILE") ; do
+ printf '0x%08X ' "$int"
+done
+echo
--
2.30.2
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