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ice: retry acquiring hardware semaphore during cross-timestamp request

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The hardware for performing a cross-timestamp on E822 uses a hardware
semaphore which we must acquire before initiating the cross-timestamp
operation.

The current implementation only attempts to acquire the semaphore once, and
assumes that it will succeed. If the semaphore is busy for any reason, the
cross-timestamp operation fails with -EFAULT.

Instead of immediately failing, try the acquire the lock a few times with a
small sleep between attempts. This ensures that most requests will go
through without issue.

Additionally, return -EBUSY instead of -EFAULT if the operation can't
continue due to the semaphore being busy.

Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
This commit is contained in:
Karol Kolacinski 2023-07-25 14:50:47 -07:00 committed by Tony Nguyen
parent 40326b2b42
commit 097c317afe
1 changed files with 15 additions and 7 deletions
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18
drivers/net/ethernet/intel/ice/ice_ptp.c
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@ -1976,11 +1976,21 @@ ice_ptp_get_syncdevicetime(ktime_t *device,
u32 hh_lock, hh_art_ctl;
int i;
#define MAX_HH_HW_LOCK_TRIES 5
#define MAX_HH_CTL_LOCK_TRIES 100
for (i = 0; i < MAX_HH_HW_LOCK_TRIES; i++) {
/* Get the HW lock */
hh_lock = rd32(hw, PFHH_SEM + (PFTSYN_SEM_BYTES * hw->pf_id));
if (hh_lock & PFHH_SEM_BUSY_M) {
usleep_range(10000, 15000);
continue;
}
break;
}
if (hh_lock & PFHH_SEM_BUSY_M) {
dev_err(ice_pf_to_dev(pf), "PTP failed to get hh lock\n");
return -EFAULT;
return -EBUSY;
}
/* Start the ART and device clock sync sequence */
@ -1988,9 +1998,7 @@ ice_ptp_get_syncdevicetime(ktime_t *device,
hh_art_ctl = hh_art_ctl | GLHH_ART_CTL_ACTIVE_M;
wr32(hw, GLHH_ART_CTL, hh_art_ctl);
#define MAX_HH_LOCK_TRIES 100
for (i = 0; i < MAX_HH_LOCK_TRIES; i++) {
for (i = 0; i < MAX_HH_CTL_LOCK_TRIES; i++) {
/* Wait for sync to complete */
hh_art_ctl = rd32(hw, GLHH_ART_CTL);
if (hh_art_ctl & GLHH_ART_CTL_ACTIVE_M) {
@ -2019,7 +2027,7 @@ ice_ptp_get_syncdevicetime(ktime_t *device,
hh_lock = hh_lock & ~PFHH_SEM_BUSY_M;
wr32(hw, PFHH_SEM + (PFTSYN_SEM_BYTES * hw->pf_id), hh_lock);
if (i == MAX_HH_LOCK_TRIES)
if (i == MAX_HH_CTL_LOCK_TRIES)
return -ETIMEDOUT;
return 0;