ppc/pnv: Add support for PQ offload on PHB5

The PQ_disable configuration bit disables the check done on the PQ
state bits when processing new MSI interrupts. When bit 9 is enabled,
the PHB forwards any MSI trigger to the XIVE interrupt controller
without checking the PQ state bits. The XIVE IC knows from the trigger
message that the PQ bits have not been checked and performs the check
locally.

This configuration bit only applies to MSIs and LSIs are still checked
on the PHB to handle the assertion level.

PQ_disable enablement is a requirement for StoreEOI.

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

include/hw/pci-host/pnv_phb4_regs.h

@@ -225,6 +225,7 @@
 /* Fundamental register set B */
 #define PHB_VERSION                     0x800
 #define PHB_CTRLR                       0x810
+#define   PHB_CTRLR_IRQ_PQ_DISABLE      PPC_BIT(9)   /* P10 */
 #define   PHB_CTRLR_IRQ_PGSZ_64K        PPC_BIT(11)
 #define   PHB_CTRLR_IRQ_STORE_EOI       PPC_BIT(12)
 #define   PHB_CTRLR_MMIO_RD_STRICT      PPC_BIT(13)

include/hw/ppc/xive.h

@@ -176,6 +176,7 @@ OBJECT_DECLARE_SIMPLE_TYPE(XiveSource, XIVE_SOURCE)
  */
 #define XIVE_SRC_H_INT_ESB     0x1 /* ESB managed with hcall H_INT_ESB */
 #define XIVE_SRC_STORE_EOI     0x2 /* Store EOI supported */
+#define XIVE_SRC_PQ_DISABLE    0x4 /* Disable check on the PQ state bits */
 
 struct XiveSource {
     DeviceState parent;