pnv/xive: Add property on xive sources to define PQ state on reset

The PQ state of a xive interrupt is always initialized to Q=1, which
means the interrupt is disabled. Since a xive source can be embedded
in many objects, this patch adds a property to allow that behavior to
be refined if needed.

Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20230703081215.55252-2-fbarrat@linux.ibm.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

hw/intc/xive.c

@@ -1232,8 +1232,7 @@ static void xive_source_reset(void *dev)
 
     /* Do not clear the LSI bitmap */
 
-    /* PQs are initialized to 0b01 (Q=1) which corresponds to "ints off" */
-    memset(xsrc->status, XIVE_ESB_OFF, xsrc->nr_irqs);
+    memset(xsrc->status, xsrc->reset_pq, xsrc->nr_irqs);
 }
 
 static void xive_source_realize(DeviceState *dev, Error **errp)
@@ -1287,6 +1286,11 @@ static Property xive_source_properties[] = {
     DEFINE_PROP_UINT64("flags", XiveSource, esb_flags, 0),
     DEFINE_PROP_UINT32("nr-irqs", XiveSource, nr_irqs, 0),
     DEFINE_PROP_UINT32("shift", XiveSource, esb_shift, XIVE_ESB_64K_2PAGE),
+    /*
+     * By default, PQs are initialized to 0b01 (Q=1) which corresponds
+     * to "ints off"
+     */
+    DEFINE_PROP_UINT8("reset-pq", XiveSource, reset_pq, XIVE_ESB_OFF),
     DEFINE_PROP_LINK("xive", XiveSource, xive, TYPE_XIVE_NOTIFIER,
                      XiveNotifier *),
     DEFINE_PROP_END_OF_LIST(),

include/hw/ppc/xive.h

@@ -187,6 +187,7 @@ struct XiveSource {
 
     /* PQ bits and LSI assertion bit */
     uint8_t         *status;
+    uint8_t         reset_pq; /* PQ state on reset */
 
     /* ESB memory region */
     uint64_t        esb_flags;