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Diffstat (limited to 'drivers/infiniband/hw/qib/qib_tx.c')
-rw-r--r--drivers/infiniband/hw/qib/qib_tx.c25
1 files changed, 17 insertions, 8 deletions
diff --git a/drivers/infiniband/hw/qib/qib_tx.c b/drivers/infiniband/hw/qib/qib_tx.c
index 1bf626c40172..31d3561400a4 100644
--- a/drivers/infiniband/hw/qib/qib_tx.c
+++ b/drivers/infiniband/hw/qib/qib_tx.c
@@ -295,6 +295,7 @@ u32 __iomem *qib_getsendbuf_range(struct qib_devdata *dd, u32 *pbufnum,
nbufs = last - first + 1; /* number in range to check */
if (dd->upd_pio_shadow) {
+update_shadow:
/*
* Minor optimization. If we had no buffers on last call,
* start out by doing the update; continue and do scan even
@@ -304,37 +305,39 @@ u32 __iomem *qib_getsendbuf_range(struct qib_devdata *dd, u32 *pbufnum,
updated++;
}
i = first;
-rescan:
/*
* While test_and_set_bit() is atomic, we do that and then the
* change_bit(), and the pair is not. See if this is the cause
* of the remaining armlaunch errors.
*/
spin_lock_irqsave(&dd->pioavail_lock, flags);
+ if (dd->last_pio >= first && dd->last_pio <= last)
+ i = dd->last_pio + 1;
+ if (!first)
+ /* adjust to min possible */
+ nbufs = last - dd->min_kernel_pio + 1;
for (j = 0; j < nbufs; j++, i++) {
if (i > last)
- i = first;
+ i = !first ? dd->min_kernel_pio : first;
if (__test_and_set_bit((2 * i) + 1, shadow))
continue;
/* flip generation bit */
__change_bit(2 * i, shadow);
/* remember that the buffer can be written to now */
__set_bit(i, dd->pio_writing);
+ if (!first && first != last) /* first == last on VL15, avoid */
+ dd->last_pio = i;
break;
}
spin_unlock_irqrestore(&dd->pioavail_lock, flags);
if (j == nbufs) {
- if (!updated) {
+ if (!updated)
/*
* First time through; shadow exhausted, but may be
* buffers available, try an update and then rescan.
*/
- update_send_bufs(dd);
- updated++;
- i = first;
- goto rescan;
- }
+ goto update_shadow;
no_send_bufs(dd);
buf = NULL;
} else {
@@ -422,14 +425,20 @@ void qib_chg_pioavailkernel(struct qib_devdata *dd, unsigned start,
__clear_bit(QLOGIC_IB_SENDPIOAVAIL_CHECK_SHIFT
+ start, dd->pioavailshadow);
__set_bit(start, dd->pioavailkernel);
+ if ((start >> 1) < dd->min_kernel_pio)
+ dd->min_kernel_pio = start >> 1;
} else {
__set_bit(start + QLOGIC_IB_SENDPIOAVAIL_BUSY_SHIFT,
dd->pioavailshadow);
__clear_bit(start, dd->pioavailkernel);
+ if ((start >> 1) > dd->min_kernel_pio)
+ dd->min_kernel_pio = start >> 1;
}
start += 2;
}
+ if (dd->min_kernel_pio > 0 && dd->last_pio < dd->min_kernel_pio - 1)
+ dd->last_pio = dd->min_kernel_pio - 1;
spin_unlock_irqrestore(&dd->pioavail_lock, flags);
dd->f_txchk_change(dd, ostart, len, avail, rcd);