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IB/qib: Add percpu counter replacing qib_devdata int_counter

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This patch replaces the dd->int_counter with a percpu counter.

The maintanance of qib_stats.sps_ints and int_counter are
combined into the new counter.

There are two new functions added to read the counter:
- qib_int_counter (for a particular qib_devdata)
- qib_sps_ints (for all HCAs)

A z_int_counter is added to allow the interrupt detection logic
to determine if interrupts have occured since z_int_counter
was "reset".

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Mike Marciniszyn
2014-03-07 08:40:49 -05:00
committed by Roland Dreier
parent f8b6c47a44
commit 1ed88dd7d0
6 changed files with 59 additions and 34 deletions
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7
drivers/infiniband/hw/qib/qib_iba6120.c
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@@ -1634,9 +1634,7 @@ static irqreturn_t qib_6120intr(int irq, void *data)
goto bail;
}
qib_stats.sps_ints++;
if (dd->int_counter != (u32) -1)
dd->int_counter++;
this_cpu_inc(*dd->int_counter);
if (unlikely(istat & (~QLOGIC_IB_I_BITSEXTANT |
QLOGIC_IB_I_GPIO | QLOGIC_IB_I_ERROR)))
@@ -1808,7 +1806,8 @@ static int qib_6120_setup_reset(struct qib_devdata *dd)
* isn't set.
*/
dd->flags &= ~(QIB_INITTED | QIB_PRESENT);
dd->int_counter = 0; /* so we check interrupts work again */
/* so we check interrupts work again */
dd->z_int_counter = qib_int_counter(dd);
val = dd->control | QLOGIC_IB_C_RESET;
writeq(val, &dd->kregbase[kr_control]);
mb(); /* prevent compiler re-ordering around actual reset */