IB/hfi1: Insure int mask for in-kernel receive contexts is clear

The only use for the urg interrupt is for priority PSM packets.

There is no reason for this interrupt to be enabled for kernel
contexts.

Reviewed-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/hfi1/chip.c

@@ -12935,6 +12935,32 @@ int hfi1_tempsense_rd(struct hfi1_devdata *dd, struct hfi1_temp *temp)
 	return ret;
 }
 
+/**
+ * get_int_mask - get 64 bit int mask
+ * @dd - the devdata
+ * @i - the csr (relative to CCE_INT_MASK)
+ *
+ * Returns the mask with the urgent interrupt mask
+ * bit clear for kernel receive contexts.
+ */
+static u64 get_int_mask(struct hfi1_devdata *dd, u32 i)
+{
+	u64 mask = U64_MAX; /* default to no change */
+
+	if (i >= (IS_RCVURGENT_START / 64) && i < (IS_RCVURGENT_END / 64)) {
+		int j = (i - (IS_RCVURGENT_START / 64)) * 64;
+		int k = !j ? IS_RCVURGENT_START % 64 : 0;
+
+		if (j)
+			j -= IS_RCVURGENT_START % 64;
+		/* j = 0..dd->first_dyn_alloc_ctxt - 1,k = 0..63 */
+		for (; j < dd->first_dyn_alloc_ctxt && k < 64; j++, k++)
+			/* convert to bit in mask and clear */
+			mask &= ~BIT_ULL(k);
+	}
+	return mask;
+}
+
 /* ========================================================================= */
 
 /*
@@ -12948,9 +12974,12 @@ void set_intr_state(struct hfi1_devdata *dd, u32 enable)
 	 * In HFI, the mask needs to be 1 to allow interrupts.
 	 */
 	if (enable) {
-		/* enable all interrupts */
-		for (i = 0; i < CCE_NUM_INT_CSRS; i++)
-			write_csr(dd, CCE_INT_MASK + (8 * i), ~(u64)0);
+		/* enable all interrupts but urgent on kernel contexts */
+		for (i = 0; i < CCE_NUM_INT_CSRS; i++) {
+			u64 mask = get_int_mask(dd, i);
+
+			write_csr(dd, CCE_INT_MASK + (8 * i), mask);
+		}
 
 		init_qsfp_int(dd);
 	} else {