diff options
Diffstat (limited to 'drivers/infiniband/hw/ipath/ipath_driver.c')
| -rw-r--r-- | drivers/infiniband/hw/ipath/ipath_driver.c | 25 |
1 files changed, 22 insertions, 3 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_driver.c b/drivers/infiniband/hw/ipath/ipath_driver.c index e2b0bc8ebaf..66b41ecf898 100644 --- a/drivers/infiniband/hw/ipath/ipath_driver.c +++ b/drivers/infiniband/hw/ipath/ipath_driver.c @@ -870,7 +870,7 @@ void ipath_kreceive(struct ipath_devdata *dd) const u32 maxcnt = dd->ipath_rcvhdrcnt * rsize; /* words */ u32 etail = -1, l, hdrqtail; struct ips_message_header *hdr; - u32 eflags, i, etype, tlen, pkttot = 0, updegr=0; + u32 eflags, i, etype, tlen, pkttot = 0, updegr=0, reloop=0; static u64 totcalls; /* stats, may eventually remove */ char emsg[128]; @@ -885,9 +885,11 @@ void ipath_kreceive(struct ipath_devdata *dd) goto bail; l = dd->ipath_port0head; - if (l == (u32)le64_to_cpu(*dd->ipath_hdrqtailptr)) + hdrqtail = (u32) le64_to_cpu(*dd->ipath_hdrqtailptr); + if (l == hdrqtail) goto done; +reloop: /* read only once at start for performance */ hdrqtail = (u32)le64_to_cpu(*dd->ipath_hdrqtailptr); @@ -1011,7 +1013,7 @@ void ipath_kreceive(struct ipath_devdata *dd) */ if (l == hdrqtail || (i && !(i&0xf))) { u64 lval; - if (l == hdrqtail) /* want interrupt only on last */ + if (l == hdrqtail) /* PE-800 interrupt only on last */ lval = dd->ipath_rhdrhead_intr_off | l; else lval = l; @@ -1024,6 +1026,23 @@ void ipath_kreceive(struct ipath_devdata *dd) } } + if (!dd->ipath_rhdrhead_intr_off && !reloop) { + /* HT-400 workaround; we can have a race clearing chip + * interrupt with another interrupt about to be delivered, + * and can clear it before it is delivered on the GPIO + * workaround. By doing the extra check here for the + * in-memory tail register updating while we were doing + * earlier packets, we "almost" guarantee we have covered + * that case. + */ + u32 hqtail = (u32)le64_to_cpu(*dd->ipath_hdrqtailptr); + if (hqtail != hdrqtail) { + hdrqtail = hqtail; + reloop = 1; /* loop 1 extra time at most */ + goto reloop; + } + } + pkttot += i; dd->ipath_port0head = l; |