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, 34 insertions, 3 deletions

diff --git a/hw/intc/pnv_xive2.c b/hw/intc/pnv_xive2.c
index 35a7f7ae4d..1fa89c7792 100644
--- a/hw/intc/pnv_xive2.c
+++ b/hw/intc/pnv_xive2.c
@@ -285,6 +285,34 @@ static int pnv_xive2_vst_write(PnvXive2 *xive, uint32_t type, uint8_t blk,
     return 0;
 }
 
+static int pnv_xive2_get_pq(Xive2Router *xrtr, uint8_t blk, uint32_t idx,
+                             uint8_t *pq)
+{
+    PnvXive2 *xive = PNV_XIVE2(xrtr);
+
+    if (pnv_xive2_block_id(xive) != blk) {
+        xive2_error(xive, "VST: EAS %x is remote !?", XIVE_EAS(blk, idx));
+        return -1;
+    }
+
+    *pq = xive_source_esb_get(&xive->ipi_source, idx);
+    return 0;
+}
+
+static int pnv_xive2_set_pq(Xive2Router *xrtr, uint8_t blk, uint32_t idx,
+                             uint8_t *pq)
+{
+    PnvXive2 *xive = PNV_XIVE2(xrtr);
+
+    if (pnv_xive2_block_id(xive) != blk) {
+        xive2_error(xive, "VST: EAS %x is remote !?", XIVE_EAS(blk, idx));
+        return -1;
+    }
+
+    *pq = xive_source_esb_set(&xive->ipi_source, idx, *pq);
+    return 0;
+}
+
 static int pnv_xive2_get_end(Xive2Router *xrtr, uint8_t blk, uint32_t idx,
                              Xive2End *end)
 {
@@ -487,12 +515,12 @@ static PnvXive2 *pnv_xive2_tm_get_xive(PowerPCCPU *cpu)
  * source interrupt number before forwarding the source event
  * notification to the Router. This is required on a multichip system.
  */
-static void pnv_xive2_notify(XiveNotifier *xn, uint32_t srcno)
+static void pnv_xive2_notify(XiveNotifier *xn, uint32_t srcno, bool pq_checked)
 {
     PnvXive2 *xive = PNV_XIVE2(xn);
     uint8_t blk = pnv_xive2_block_id(xive);
 
-    xive2_router_notify(xn, XIVE_EAS(blk, srcno));
+    xive2_router_notify(xn, XIVE_EAS(blk, srcno), pq_checked);
 }
 
 /*
@@ -1381,7 +1409,8 @@ static void pnv_xive2_ic_hw_trigger(PnvXive2 *xive, hwaddr addr,
     blk = XIVE_EAS_BLOCK(val);
     idx = XIVE_EAS_INDEX(val);
 
-    xive2_router_notify(XIVE_NOTIFIER(xive), XIVE_EAS(blk, idx));
+    xive2_router_notify(XIVE_NOTIFIER(xive), XIVE_EAS(blk, idx),
+                         !!(val & XIVE_TRIGGER_PQ));
 }
 
 static void pnv_xive2_ic_notify_write(void *opaque, hwaddr offset,
@@ -1880,6 +1909,8 @@ static void pnv_xive2_class_init(ObjectClass *klass, void *data)
     device_class_set_props(dc, pnv_xive2_properties);
 
     xrc->get_eas   = pnv_xive2_get_eas;
+    xrc->get_pq    = pnv_xive2_get_pq;
+    xrc->set_pq    = pnv_xive2_set_pq;
     xrc->get_end   = pnv_xive2_get_end;
     xrc->write_end = pnv_xive2_write_end;
     xrc->get_nvp   = pnv_xive2_get_nvp;