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ptp: add kernel API ptp_get_vclocks_index() 

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>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yangbo Lu 2021-06-30 16:11:55 +08:00 committed by David S. Miller
parent 44c494c8e3
commit acb288e804
4 changed files with 53 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/ptp/ptp_clock.c
View File

@ -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);

2
drivers/ptp/ptp_private.h
View File

@ -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
*/

35
drivers/ptp/ptp_vclock.c
View File

@ -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);

14
include/linux/ptp_clock_kernel.h
View File

@ -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