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authorStefan Roscher <ossrosch@linux.vnet.ibm.com>2008-07-14 23:48:47 -0700
committerRoland Dreier <rolandd@cisco.com>2008-07-14 23:48:47 -0700
commit6f7bc01a7382641c61ec036d68ff3a9140b48a1c (patch)
treedebf518649e7af08c42465f6683bc66322ba1554
parent3e255eac561672cbc92844b9f16cae9304c2a783 (diff)
IB/ehca: In case of lost interrupts, trigger EOI to reenable interrupts
During corner case testing, we noticed that some versions of ehca do not properly transition to interrupt done in special load situations. This can be resolved by periodically triggering EOI through H_EOI, if EQEs are pending. Signed-off-by: Stefan Roscher <stefan.roscher@de.ibm.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Roland Dreier <rolandd@cisco.com>
-rw-r--r--drivers/infiniband/hw/ehca/ehca_irq.c9
-rw-r--r--drivers/infiniband/hw/ehca/hcp_if.c10
-rw-r--r--drivers/infiniband/hw/ehca/hcp_if.h1
3 files changed, 18 insertions, 2 deletions
diff --git a/drivers/infiniband/hw/ehca/ehca_irq.c b/drivers/infiniband/hw/ehca/ehca_irq.c
index ce1ab0571be..0792d930c48 100644
--- a/drivers/infiniband/hw/ehca/ehca_irq.c
+++ b/drivers/infiniband/hw/ehca/ehca_irq.c
@@ -531,7 +531,7 @@ void ehca_process_eq(struct ehca_shca *shca, int is_irq)
{
struct ehca_eq *eq = &shca->eq;
struct ehca_eqe_cache_entry *eqe_cache = eq->eqe_cache;
- u64 eqe_value;
+ u64 eqe_value, ret;
unsigned long flags;
int eqe_cnt, i;
int eq_empty = 0;
@@ -583,8 +583,13 @@ void ehca_process_eq(struct ehca_shca *shca, int is_irq)
ehca_dbg(&shca->ib_device,
"No eqe found for irq event");
goto unlock_irq_spinlock;
- } else if (!is_irq)
+ } else if (!is_irq) {
+ ret = hipz_h_eoi(eq->ist);
+ if (ret != H_SUCCESS)
+ ehca_err(&shca->ib_device,
+ "bad return code EOI -rc = %ld\n", ret);
ehca_dbg(&shca->ib_device, "deadman found %x eqe", eqe_cnt);
+ }
if (unlikely(eqe_cnt == EHCA_EQE_CACHE_SIZE))
ehca_dbg(&shca->ib_device, "too many eqes for one irq event");
/* enable irq for new packets */
diff --git a/drivers/infiniband/hw/ehca/hcp_if.c b/drivers/infiniband/hw/ehca/hcp_if.c
index 5245e13c3a3..415d3a465de 100644
--- a/drivers/infiniband/hw/ehca/hcp_if.c
+++ b/drivers/infiniband/hw/ehca/hcp_if.c
@@ -933,3 +933,13 @@ u64 hipz_h_error_data(const struct ipz_adapter_handle adapter_handle,
r_cb,
0, 0, 0, 0);
}
+
+u64 hipz_h_eoi(int irq)
+{
+ unsigned long xirr;
+
+ iosync();
+ xirr = (0xffULL << 24) | irq;
+
+ return plpar_hcall_norets(H_EOI, xirr);
+}
diff --git a/drivers/infiniband/hw/ehca/hcp_if.h b/drivers/infiniband/hw/ehca/hcp_if.h
index 60ce02b7066..2c3c6e0ea5c 100644
--- a/drivers/infiniband/hw/ehca/hcp_if.h
+++ b/drivers/infiniband/hw/ehca/hcp_if.h
@@ -260,5 +260,6 @@ u64 hipz_h_error_data(const struct ipz_adapter_handle adapter_handle,
const u64 ressource_handle,
void *rblock,
unsigned long *byte_count);
+u64 hipz_h_eoi(int irq);
#endif /* __HCP_IF_H__ */