ppc/xive: Add support for PQ state bits offload

The trigger message coming from a HW source contains a special bit
informing the XIVE interrupt controller that the PQ bits have been
checked at the source or not. Depending on the value, the IC can
perform the check and the state transition locally using its own PQ
state bits.

The following changes add new accessors to the XiveRouter required to
query and update the PQ state bits. This only applies to the PowerNV
machine. sPAPR accessors are provided but the pSeries machine should
not be concerned by such complex configuration for the moment.

Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

1 files changed, 25 insertions, 0 deletions

diff --git a/hw/intc/spapr_xive.c b/hw/intc/spapr_xive.c
index eae95c716f..dc641cc604 100644
--- a/hw/intc/spapr_xive.c
+++ b/hw/intc/spapr_xive.c
@@ -480,6 +480,29 @@ static uint8_t spapr_xive_get_block_id(XiveRouter *xrtr)
     return SPAPR_XIVE_BLOCK_ID;
 }
 
+static int spapr_xive_get_pq(XiveRouter *xrtr, uint8_t blk, uint32_t idx,
+                             uint8_t *pq)
+{
+    SpaprXive *xive = SPAPR_XIVE(xrtr);
+
+    assert(SPAPR_XIVE_BLOCK_ID == blk);
+
+    *pq = xive_source_esb_get(&xive->source, idx);
+    return 0;
+}
+
+static int spapr_xive_set_pq(XiveRouter *xrtr, uint8_t blk, uint32_t idx,
+                             uint8_t *pq)
+{
+    SpaprXive *xive = SPAPR_XIVE(xrtr);
+
+    assert(SPAPR_XIVE_BLOCK_ID == blk);
+
+    *pq = xive_source_esb_set(&xive->source, idx, *pq);
+    return 0;
+}
+
+
 static const VMStateDescription vmstate_spapr_xive_end = {
     .name = TYPE_SPAPR_XIVE "/end",
     .version_id = 1,
@@ -788,6 +811,8 @@ static void spapr_xive_class_init(ObjectClass *klass, void *data)
     dc->vmsd    = &vmstate_spapr_xive;
 
     xrc->get_eas = spapr_xive_get_eas;
+    xrc->get_pq  = spapr_xive_get_pq;
+    xrc->set_pq  = spapr_xive_set_pq;
     xrc->get_end = spapr_xive_get_end;
     xrc->write_end = spapr_xive_write_end;
     xrc->get_nvt = spapr_xive_get_nvt;