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ptp: track available ptp vclocks information

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Track available ptp vclocks information. Record index values
of available ptp vclocks during registering and unregistering.

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 16:11:54 +08:00 committed by David S. Miller
parent 73f37068d5
commit 44c494c8e3
3 changed files with 40 additions and 4 deletions
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15
drivers/ptp/ptp_clock.c
View File

@ -196,6 +196,7 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
{
struct ptp_clock *ptp;
int err = 0, index, major = MAJOR(ptp_devt);
size_t size;
if (info->n_alarm > PTP_MAX_ALARMS)
return ERR_PTR(-EINVAL);
@ -238,9 +239,17 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
strcmp(parent->class->name, "ptp") == 0)
ptp->is_virtual_clock = true;
if (!ptp->is_virtual_clock)
if (!ptp->is_virtual_clock) {
ptp->max_vclocks = PTP_DEFAULT_MAX_VCLOCKS;
size = sizeof(int) * ptp->max_vclocks;
ptp->vclock_index = kzalloc(size, GFP_KERNEL);
if (!ptp->vclock_index) {
err = -ENOMEM;
goto no_mem_for_vclocks;
}
}
err = ptp_populate_pin_groups(ptp);
if (err)
goto no_pin_groups;
@ -285,6 +294,8 @@ no_clock:
no_pps:
ptp_cleanup_pin_groups(ptp);
no_pin_groups:
kfree(ptp->vclock_index);
no_mem_for_vclocks:
if (ptp->kworker)
kthread_destroy_worker(ptp->kworker);
kworker_err:
@ -309,6 +320,8 @@ int ptp_clock_unregister(struct ptp_clock *ptp)
ptp->defunct = 1;
wake_up_interruptible(&ptp->tsev_wq);
kfree(ptp->vclock_index);
if (ptp->kworker) {
kthread_cancel_delayed_work_sync(&ptp->aux_work);
kthread_destroy_worker(ptp->kworker);

1
drivers/ptp/ptp_private.h
View File

@ -49,6 +49,7 @@ struct ptp_clock {
struct kthread_delayed_work aux_work;
unsigned int max_vclocks;
unsigned int n_vclocks;
int *vclock_index;
struct mutex n_vclocks_mux; /* protect concurrent n_vclocks access */
bool is_virtual_clock;
};

28
drivers/ptp/ptp_sysfs.c
View File

@ -213,6 +213,9 @@ static ssize_t n_vclocks_store(struct device *dev,
if (!vclock)
goto out;
*(ptp->vclock_index + ptp->n_vclocks + i) =
vclock->clock->index;
dev_info(dev, "new virtual clock ptp%d\n",
vclock->clock->index);
}
@ -223,6 +226,9 @@ static ssize_t n_vclocks_store(struct device *dev,
i = ptp->n_vclocks - num;
device_for_each_child_reverse(dev, &i,
unregister_vclock);
for (i = 1; i <= ptp->n_vclocks - num; i++)
*(ptp->vclock_index + ptp->n_vclocks - i) = -1;
}
if (num == 0)
@ -256,6 +262,9 @@ static ssize_t max_vclocks_store(struct device *dev,
const char *buf, size_t count)
{
struct ptp_clock *ptp = dev_get_drvdata(dev);
unsigned int *vclock_index;
int err = -EINVAL;
size_t size;
u32 max;
if (kstrtou32(buf, 0, &max) || max == 0)
@ -267,16 +276,29 @@ static ssize_t max_vclocks_store(struct device *dev,
if (mutex_lock_interruptible(&ptp->n_vclocks_mux))
return -ERESTARTSYS;
if (max < ptp->n_vclocks) {
mutex_unlock(&ptp->n_vclocks_mux);
return -EINVAL;
if (max < ptp->n_vclocks)
goto out;
size = sizeof(int) * max;
vclock_index = kzalloc(size, GFP_KERNEL);
if (!vclock_index) {
err = -ENOMEM;
goto out;
}
size = sizeof(int) * ptp->n_vclocks;
memcpy(vclock_index, ptp->vclock_index, size);
kfree(ptp->vclock_index);
ptp->vclock_index = vclock_index;
ptp->max_vclocks = max;
mutex_unlock(&ptp->n_vclocks_mux);
return count;
out:
mutex_unlock(&ptp->n_vclocks_mux);
return err;
}
static DEVICE_ATTR_RW(max_vclocks);