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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-09-11 04:34:46 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-09-11 04:34:46 -0300
commit863981e96738983919de841ec669e157e6bdaeb0 (patch)
treed6d89a12e7eb8017837c057935a2271290907f76 /drivers/misc/sgi-gru/grukservices.c
parent8dec7c70575785729a6a9e6719a955e9c545bcab (diff)
Linux-libre 4.7.1-gnupck-4.7.1-gnu
Diffstat (limited to 'drivers/misc/sgi-gru/grukservices.c')
-rw-r--r--drivers/misc/sgi-gru/grukservices.c38
1 files changed, 22 insertions, 16 deletions
diff --git a/drivers/misc/sgi-gru/grukservices.c b/drivers/misc/sgi-gru/grukservices.c
index 967b9dd24..030769018 100644
--- a/drivers/misc/sgi-gru/grukservices.c
+++ b/drivers/misc/sgi-gru/grukservices.c
@@ -718,8 +718,8 @@ cberr:
static int send_message_put_nacked(void *cb, struct gru_message_queue_desc *mqd,
void *mesg, int lines)
{
- unsigned long m, *val = mesg, gpa, save;
- int ret;
+ unsigned long m;
+ int ret, loops = 200; /* experimentally determined */
m = mqd->mq_gpa + (gru_get_amo_value_head(cb) << 6);
if (lines == 2) {
@@ -735,22 +735,28 @@ static int send_message_put_nacked(void *cb, struct gru_message_queue_desc *mqd,
return MQE_OK;
/*
- * Send a cross-partition interrupt to the SSI that contains the target
- * message queue. Normally, the interrupt is automatically delivered by
- * hardware but some error conditions require explicit delivery.
- * Use the GRU to deliver the interrupt. Otherwise partition failures
+ * Send a noop message in order to deliver a cross-partition interrupt
+ * to the SSI that contains the target message queue. Normally, the
+ * interrupt is automatically delivered by hardware following mesq
+ * operations, but some error conditions require explicit delivery.
+ * The noop message will trigger delivery. Otherwise partition failures
* could cause unrecovered errors.
*/
- gpa = uv_global_gru_mmr_address(mqd->interrupt_pnode, UVH_IPI_INT);
- save = *val;
- *val = uv_hub_ipi_value(mqd->interrupt_apicid, mqd->interrupt_vector,
- dest_Fixed);
- gru_vstore_phys(cb, gpa, gru_get_tri(mesg), IAA_REGISTER, IMA);
- ret = gru_wait(cb);
- *val = save;
- if (ret != CBS_IDLE)
- return MQE_UNEXPECTED_CB_ERR;
- return MQE_OK;
+ do {
+ ret = send_noop_message(cb, mqd, mesg);
+ } while ((ret == MQIE_AGAIN || ret == MQE_CONGESTION) && (loops-- > 0));
+
+ if (ret == MQIE_AGAIN || ret == MQE_CONGESTION) {
+ /*
+ * Don't indicate to the app to resend the message, as it's
+ * already been successfully sent. We simply send an OK
+ * (rather than fail the send with MQE_UNEXPECTED_CB_ERR),
+ * assuming that the other side is receiving enough
+ * interrupts to get this message processed anyway.
+ */
+ ret = MQE_OK;
+ }
+ return ret;
}
/*