IB/qib: Don't mark VL15 bufs as WC to avoid a rare 7322 chip problem
Don't set write combining via PAT on the VL15 buffers to avoid a rare
problem with unaligned writes from interrupt-flushed store buffers.
Signed-off-by: Dave Olson <dave.olson@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/hw/qib/qib_diag.c b/drivers/infiniband/hw/qib/qib_diag.c
index ca98dd5..05dcf0d 100644
--- a/drivers/infiniband/hw/qib/qib_diag.c
+++ b/drivers/infiniband/hw/qib/qib_diag.c
@@ -233,6 +233,7 @@
u32 __iomem *krb32 = (u32 __iomem *)dd->kregbase;
u32 __iomem *map = NULL;
u32 cnt = 0;
+ u32 tot4k, offs4k;
/* First, simplest case, offset is within the first map. */
kreglen = (dd->kregend - dd->kregbase) * sizeof(u64);
@@ -250,7 +251,8 @@
if (dd->userbase) {
/* If user regs mapped, they are after send, so set limit. */
u32 ulim = (dd->cfgctxts * dd->ureg_align) + dd->uregbase;
- snd_lim = dd->uregbase;
+ if (!dd->piovl15base)
+ snd_lim = dd->uregbase;
krb32 = (u32 __iomem *)dd->userbase;
if (offset >= dd->uregbase && offset < ulim) {
map = krb32 + (offset - dd->uregbase) / sizeof(u32);
@@ -277,14 +279,14 @@
/* If 4k buffers exist, account for them by bumping
* appropriate limit.
*/
+ tot4k = dd->piobcnt4k * dd->align4k;
+ offs4k = dd->piobufbase >> 32;
if (dd->piobcnt4k) {
- u32 tot4k = dd->piobcnt4k * dd->align4k;
- u32 offs4k = dd->piobufbase >> 32;
if (snd_bottom > offs4k)
snd_bottom = offs4k;
else {
/* 4k above 2k. Bump snd_lim, if needed*/
- if (!dd->userbase)
+ if (!dd->userbase || dd->piovl15base)
snd_lim = offs4k + tot4k;
}
}
@@ -298,6 +300,15 @@
cnt = snd_lim - offset;
}
+ if (!map && offs4k && dd->piovl15base) {
+ snd_lim = offs4k + tot4k + 2 * dd->align4k;
+ if (offset >= (offs4k + tot4k) && offset < snd_lim) {
+ map = (u32 __iomem *)dd->piovl15base +
+ ((offset - (offs4k + tot4k)) / sizeof(u32));
+ cnt = snd_lim - offset;
+ }
+ }
+
mapped:
if (cntp)
*cntp = cnt;