xive/p9: remove XIVE_INT_SAFETY_GAP

It was used by bringup code only.

Using HW interrupt numbers in a high range was a way to check that HW
interrupt numbers (OPAL) and logical interrupt numbers (Linux) were
not getting mixed in the event queues.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>

hw/xive.c

@@ -36,15 +36,13 @@
 #define XIVE_EXTRA_CHECK_INIT_CACHE
 #undef XIVE_CHECK_MISROUTED_IPI
 #define XIVE_CHECK_LOCKS
-#define XIVE_INT_SAFETY_GAP 0x1000
 #else
 #undef  XIVE_DEBUG_DUPLICATES
 #undef  XIVE_PERCPU_LOG
 #undef  XIVE_DEBUG_INIT_CACHE_UPDATES
 #undef  XIVE_EXTRA_CHECK_INIT_CACHE
 #undef  XIVE_CHECK_MISROUTED_IPI
 #undef  XIVE_CHECK_LOCKS
-#define XIVE_INT_SAFETY_GAP 0x10
 #endif
 
 /*
@@ -151,6 +149,12 @@
  */
 #define MAX_INT_ENTRIES		(1 * 1024 * 1024)
 
+/*
+ * First interrupt number, also the first logical interrupt number
+ * allocated by Linux
+ */
+#define XIVE_INT_FIRST		0x10
+
 /* Corresponding direct table sizes */
 #define SBE_SIZE	(MAX_INT_ENTRIES / 4)
 #define IVT_SIZE	(MAX_INT_ENTRIES * 8)
@@ -2590,8 +2594,8 @@ static struct xive *init_one_xive(struct dt_node *np)
 	/* Make sure we never hand out "2" as it's reserved for XICS emulation
 	 * IPI returns. Generally start handing out at 0x10
 	 */
-	if (x->int_ipi_top < XIVE_INT_SAFETY_GAP)
-		x->int_ipi_top = XIVE_INT_SAFETY_GAP;
+	if (x->int_ipi_top < XIVE_INT_FIRST)
+		x->int_ipi_top = XIVE_INT_FIRST;
 
 	/* Allocate a few bitmaps */
 	x->eq_map = zalloc(BITMAP_BYTES(MAX_EQ_COUNT >> 3));
@@ -3490,7 +3494,7 @@ static int64_t opal_xive_get_xirr(uint32_t *out_xirr, bool just_poll)
 		/* XXX Use "p" to select queue */
 		val = xive_read_eq(xs, just_poll);
 
-		if (val && val < XIVE_INT_SAFETY_GAP)
+		if (val && val < XIVE_INT_FIRST)
 			xive_cpu_err(c, "Bogus interrupt 0x%x received !\n", val);
 
 		/* Convert to magic IPI if needed */