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Subject[PATCH net-next 02/11] net: ethernet: ti: cpts: separate hw counter read from timecounter
Date
Separate hw counter read from timecounter code:
- add CPTS context field to store current HW counter value
- move HW timestamp request and FIFO read code out of timecounter code
- convert cyc2time on event reception in cpts_fifo_read()
- call timecounter_read() in cpts_fifo_read() to update tk->cycle_last

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
---
drivers/net/ethernet/ti/cpts.c | 53 +++++++++++++++++-----------------
drivers/net/ethernet/ti/cpts.h | 2 ++
2 files changed, 29 insertions(+), 26 deletions(-)

diff --git a/drivers/net/ethernet/ti/cpts.c b/drivers/net/ethernet/ti/cpts.c
index f07b40504e5b..6a1844cd23ff 100644
--- a/drivers/net/ethernet/ti/cpts.c
+++ b/drivers/net/ethernet/ti/cpts.c
@@ -112,10 +112,8 @@ static bool cpts_match_tx_ts(struct cpts *cpts, struct cpts_event *event)
(struct cpts_skb_cb_data *)skb->cb;

if (cpts_match(skb, class, seqid, mtype)) {
- u64 ns = timecounter_cyc2time(&cpts->tc, event->low);
-
memset(&ssh, 0, sizeof(ssh));
- ssh.hwtstamp = ns_to_ktime(ns);
+ ssh.hwtstamp = ns_to_ktime(event->timestamp);
skb_tstamp_tx(skb, &ssh);
found = true;
__skb_unlink(skb, &cpts->txq);
@@ -158,8 +156,16 @@ static int cpts_fifo_read(struct cpts *cpts, int match)
event->tmo = jiffies + 2;
event->high = hi;
event->low = lo;
+ event->timestamp = timecounter_cyc2time(&cpts->tc, event->low);
type = event_type(event);
+
+ dev_dbg(cpts->dev, "CPTS_EV: %d high:%08X low:%08x\n",
+ type, event->high, event->low);
switch (type) {
+ case CPTS_EV_PUSH:
+ WRITE_ONCE(cpts->cur_timestamp, lo);
+ timecounter_read(&cpts->tc);
+ break;
case CPTS_EV_TX:
if (cpts_match_tx_ts(cpts, event)) {
/* if the new event matches an existing skb,
@@ -168,7 +174,6 @@ static int cpts_fifo_read(struct cpts *cpts, int match)
break;
}
/* fall through */
- case CPTS_EV_PUSH:
case CPTS_EV_RX:
list_del_init(&event->list);
list_add_tail(&event->list, &cpts->events);
@@ -189,26 +194,17 @@ static int cpts_fifo_read(struct cpts *cpts, int match)

static u64 cpts_systim_read(const struct cyclecounter *cc)
{
- u64 val = 0;
- struct cpts_event *event;
- struct list_head *this, *next;
struct cpts *cpts = container_of(cc, struct cpts, cc);

- cpts_write32(cpts, TS_PUSH, ts_push);
- if (cpts_fifo_read(cpts, CPTS_EV_PUSH))
- dev_err(cpts->dev, "cpts: unable to obtain a time stamp\n");
+ return READ_ONCE(cpts->cur_timestamp);
+}

- list_for_each_safe(this, next, &cpts->events) {
- event = list_entry(this, struct cpts_event, list);
- if (event_type(event) == CPTS_EV_PUSH) {
- list_del_init(&event->list);
- list_add(&event->list, &cpts->pool);
- val = event->low;
- break;
- }
- }
+static void cpts_update_cur_time(struct cpts *cpts, int match)
+{
+ cpts_write32(cpts, TS_PUSH, ts_push);

- return val;
+ if (cpts_fifo_read(cpts, match) && match != -1)
+ dev_err(cpts->dev, "cpts: unable to obtain a time stamp\n");
}

/* PTP clock operations */
@@ -232,7 +228,7 @@ static int cpts_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)

spin_lock_irqsave(&cpts->lock, flags);

- timecounter_read(&cpts->tc);
+ cpts_update_cur_time(cpts, CPTS_EV_PUSH);

cpts->cc.mult = neg_adj ? mult - diff : mult + diff;

@@ -260,6 +256,9 @@ static int cpts_ptp_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts)
struct cpts *cpts = container_of(ptp, struct cpts, info);

spin_lock_irqsave(&cpts->lock, flags);
+
+ cpts_update_cur_time(cpts, CPTS_EV_PUSH);
+
ns = timecounter_read(&cpts->tc);
spin_unlock_irqrestore(&cpts->lock, flags);

@@ -294,11 +293,14 @@ static long cpts_overflow_check(struct ptp_clock_info *ptp)
{
struct cpts *cpts = container_of(ptp, struct cpts, info);
unsigned long delay = cpts->ov_check_period;
- struct timespec64 ts;
unsigned long flags;
+ u64 ns;

spin_lock_irqsave(&cpts->lock, flags);
- ts = ns_to_timespec64(timecounter_read(&cpts->tc));
+
+ cpts_update_cur_time(cpts, -1);
+
+ ns = timecounter_read(&cpts->tc);

if (!skb_queue_empty(&cpts->txq)) {
cpts_purge_txq(cpts);
@@ -307,8 +309,7 @@ static long cpts_overflow_check(struct ptp_clock_info *ptp)
}
spin_unlock_irqrestore(&cpts->lock, flags);

- dev_dbg(cpts->dev, "cpts overflow check at %lld.%09ld\n",
- (long long)ts.tv_sec, ts.tv_nsec);
+ dev_dbg(cpts->dev, "cpts overflow check at %lld\n", ns);
return (long)delay;
}

@@ -390,7 +391,7 @@ static u64 cpts_find_ts(struct cpts *cpts, struct sk_buff *skb, int ev_type)
seqid = (event->high >> SEQUENCE_ID_SHIFT) & SEQUENCE_ID_MASK;
if (ev_type == event_type(event) &&
cpts_match(skb, class, seqid, mtype)) {
- ns = timecounter_cyc2time(&cpts->tc, event->low);
+ ns = event->timestamp;
list_del_init(&event->list);
list_add(&event->list, &cpts->pool);
break;
diff --git a/drivers/net/ethernet/ti/cpts.h b/drivers/net/ethernet/ti/cpts.h
index bb997c11ee15..32ecd1ce4d3b 100644
--- a/drivers/net/ethernet/ti/cpts.h
+++ b/drivers/net/ethernet/ti/cpts.h
@@ -94,6 +94,7 @@ struct cpts_event {
unsigned long tmo;
u32 high;
u32 low;
+ u64 timestamp;
};

struct cpts {
@@ -114,6 +115,7 @@ struct cpts {
struct cpts_event pool_data[CPTS_MAX_EVENTS];
unsigned long ov_check_period;
struct sk_buff_head txq;
+ u64 cur_timestamp;
};

void cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb);
--
2.17.1
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