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Subject[net-next, v5, 04/11] ptp: add kernel API ptp_get_vclocks_index()
Date
Add kernel API ptp_get_vclocks_index() to get all ptp
vclocks index on pclock.

This is preparation for supporting ptp vclocks info query
through ethtool.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
---
Changes for v3:
- Added this patch.
Changes for v4:
- Dynamically allocated memory for vclock index getting.
Changes for v5:
- None.
---
drivers/ptp/ptp_clock.c | 3 ++-
drivers/ptp/ptp_private.h | 2 ++
drivers/ptp/ptp_vclock.c | 35 ++++++++++++++++++++++++++++++++
include/linux/ptp_clock_kernel.h | 14 +++++++++++++
4 files changed, 53 insertions(+), 1 deletion(-)

diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c
index 9205a9362a9d..f012fa581cf4 100644
--- a/drivers/ptp/ptp_clock.c
+++ b/drivers/ptp/ptp_clock.c
@@ -24,10 +24,11 @@
#define PTP_PPS_EVENT PPS_CAPTUREASSERT
#define PTP_PPS_MODE (PTP_PPS_DEFAULTS | PPS_CANWAIT | PPS_TSFMT_TSPEC)

+struct class *ptp_class;
+
/* private globals */

static dev_t ptp_devt;
-static struct class *ptp_class;

static DEFINE_IDA(ptp_clocks_map);

diff --git a/drivers/ptp/ptp_private.h b/drivers/ptp/ptp_private.h
index f75fadd9b244..dba6be477067 100644
--- a/drivers/ptp/ptp_private.h
+++ b/drivers/ptp/ptp_private.h
@@ -96,6 +96,8 @@ static inline bool ptp_vclock_in_use(struct ptp_clock *ptp)
return in_use;
}

+extern struct class *ptp_class;
+
/*
* see ptp_chardev.c
*/
diff --git a/drivers/ptp/ptp_vclock.c b/drivers/ptp/ptp_vclock.c
index fc9205cc504d..cefab29a0592 100644
--- a/drivers/ptp/ptp_vclock.c
+++ b/drivers/ptp/ptp_vclock.c
@@ -148,3 +148,38 @@ void ptp_vclock_unregister(struct ptp_vclock *vclock)
ptp_clock_unregister(vclock->clock);
kfree(vclock);
}
+
+int ptp_get_vclocks_index(int pclock_index, int **vclock_index)
+{
+ char name[PTP_CLOCK_NAME_LEN] = "";
+ struct ptp_clock *ptp;
+ struct device *dev;
+ int num = 0;
+
+ if (pclock_index < 0)
+ return num;
+
+ snprintf(name, PTP_CLOCK_NAME_LEN, "ptp%d", pclock_index);
+ dev = class_find_device_by_name(ptp_class, name);
+ if (!dev)
+ return num;
+
+ ptp = dev_get_drvdata(dev);
+
+ if (mutex_lock_interruptible(&ptp->n_vclocks_mux)) {
+ put_device(dev);
+ return num;
+ }
+
+ *vclock_index = kzalloc(sizeof(int) * ptp->n_vclocks, GFP_KERNEL);
+ if (!(*vclock_index))
+ goto out;
+
+ memcpy(*vclock_index, ptp->vclock_index, sizeof(int) * ptp->n_vclocks);
+ num = ptp->n_vclocks;
+out:
+ mutex_unlock(&ptp->n_vclocks_mux);
+ put_device(dev);
+ return num;
+}
+EXPORT_SYMBOL(ptp_get_vclocks_index);
diff --git a/include/linux/ptp_clock_kernel.h b/include/linux/ptp_clock_kernel.h
index b6fb771ee524..300a984fec87 100644
--- a/include/linux/ptp_clock_kernel.h
+++ b/include/linux/ptp_clock_kernel.h
@@ -306,6 +306,18 @@ int ptp_schedule_worker(struct ptp_clock *ptp, unsigned long delay);
*/
void ptp_cancel_worker_sync(struct ptp_clock *ptp);

+/**
+ * ptp_get_vclocks_index() - get all vclocks index on pclock, and
+ * caller is responsible to free memory
+ * of vclock_index
+ *
+ * @pclock_index: phc index of ptp pclock.
+ * @vclock_index: pointer to pointer of vclock index.
+ *
+ * return number of vclocks.
+ */
+int ptp_get_vclocks_index(int pclock_index, int **vclock_index);
+
#else
static inline struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
struct device *parent)
@@ -325,6 +337,8 @@ static inline int ptp_schedule_worker(struct ptp_clock *ptp,
{ return -EOPNOTSUPP; }
static inline void ptp_cancel_worker_sync(struct ptp_clock *ptp)
{ }
+static inline int ptp_get_vclocks_index(int pclock_index, int **vclock_index)
+{ return 0; }

#endif

--
2.25.1
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