target/ppc: Add POWER9 external interrupt model

Adds support for the Hypervisor directed interrupts in addition to the
OS ones.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
[clg: - modified the icp_realize() and xive_tctx_realize() to take
        into account explicitely the POWER9 interrupt model
      - introduced a specific power9_set_irq for POWER9 ]
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20190215161648.9600-10-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 42 insertions, 0 deletions

diff --git a/hw/ppc/ppc.c b/hw/ppc/ppc.c
index 12439db..d1e3d4c 100644
--- a/hw/ppc/ppc.c
+++ b/hw/ppc/ppc.c
@@ -306,6 +306,48 @@ void ppcPOWER7_irq_init(PowerPCCPU *cpu)
     env->irq_inputs = (void **)qemu_allocate_irqs(&power7_set_irq, cpu,
                                                   POWER7_INPUT_NB);
 }
+
+/* POWER9 internal IRQ controller */
+static void power9_set_irq(void *opaque, int pin, int level)
+{
+    PowerPCCPU *cpu = opaque;
+    CPUPPCState *env = &cpu->env;
+
+    LOG_IRQ("%s: env %p pin %d level %d\n", __func__,
+                env, pin, level);
+
+    switch (pin) {
+    case POWER9_INPUT_INT:
+        /* Level sensitive - active high */
+        LOG_IRQ("%s: set the external IRQ state to %d\n",
+                __func__, level);
+        ppc_set_irq(cpu, PPC_INTERRUPT_EXT, level);
+        break;
+    case POWER9_INPUT_HINT:
+        /* Level sensitive - active high */
+        LOG_IRQ("%s: set the external IRQ state to %d\n",
+                __func__, level);
+        ppc_set_irq(cpu, PPC_INTERRUPT_HVIRT, level);
+        break;
+    default:
+        /* Unknown pin - do nothing */
+        LOG_IRQ("%s: unknown IRQ pin %d\n", __func__, pin);
+        return;
+    }
+    if (level) {
+        env->irq_input_state |= 1 << pin;
+    } else {
+        env->irq_input_state &= ~(1 << pin);
+    }
+}
+
+void ppcPOWER9_irq_init(PowerPCCPU *cpu)
+{
+    CPUPPCState *env = &cpu->env;
+
+    env->irq_inputs = (void **)qemu_allocate_irqs(&power9_set_irq, cpu,
+                                                  POWER9_INPUT_NB);
+}
 #endif /* defined(TARGET_PPC64) */
 
 void ppc40x_core_reset(PowerPCCPU *cpu)