[v6,32/33] hw/isa/piix: Consolidate IRQ triggering

Commit Message

Bernhard Beschow Jan. 9, 2023, 5:23 p.m. UTC

Speeds up PIIX4 which resolves an old TODO.

Signed-off-by: Bernhard Beschow <[e-mail]>
Reviewed-by: Michael S. Tsirkin <[e-mail]>
Message-Id: <[e-mail]>
---
 hw/isa/piix.c | 26 +++-----------------------
 1 file changed, 3 insertions(+), 23 deletions(-)

Patch

diff --git a/hw/isa/piix.c b/hw/isa/piix.c
index 33ea5275ec..f125a6175f 100644
--- a/hw/isa/piix.c
+++ b/hw/isa/piix.c
@@ -83,27 +83,6 @@  static void piix_set_irq(void *opaque, int pirq, int level)
     piix_set_irq_level(piix, pirq, level);
 }
 
-static void piix4_set_irq(void *opaque, int irq_num, int level)
-{
-    int i, pic_irq, pic_level;
-    PIIXState *s = opaque;
-    PCIBus *bus = pci_get_bus(&s->dev);
-
-    /* now we change the pic irq level according to the piix irq mappings */
-    /* XXX: optimize */
-    pic_irq = s->dev.config[PIIX_PIRQCA + irq_num];
-    if (pic_irq < ISA_NUM_IRQS) {
-        /* The pic level is the logical OR of all the PCI irqs mapped to it. */
-        pic_level = 0;
-        for (i = 0; i < PIIX_NUM_PIRQS; i++) {
-            if (pic_irq == s->dev.config[PIIX_PIRQCA + i]) {
-                pic_level |= pci_bus_get_irq_level(bus, i);
-            }
-        }
-        qemu_set_irq(s->pic.in_irqs[pic_irq], pic_level);
-    }
-}
-
 static PCIINTxRoute piix3_route_intx_pin_to_irq(void *opaque, int pin)
 {
     PIIXState *piix3 = opaque;
@@ -239,7 +218,7 @@  static int piix4_post_load(void *opaque, int version_id)
         s->rcr = 0;
     }
 
-    return 0;
+    return piix3_post_load(opaque, version_id);
 }
 
 static int piix3_pre_save(void *opaque)
@@ -554,7 +533,7 @@  static void piix4_realize(PCIDevice *dev, Error **errp)
     /* RTC */
     s->rtc.irq = qdev_get_gpio_in(DEVICE(&s->pic), s->rtc.isairq);
 
-    pci_bus_irqs(pci_bus, piix4_set_irq, s, PIIX_NUM_PIRQS);
+    pci_bus_irqs(pci_bus, piix_set_irq, s, PIIX_NUM_PIRQS);
 }
 
 static void piix4_init(Object *obj)
@@ -571,6 +550,7 @@  static void piix4_class_init(ObjectClass *klass, void *data)
     DeviceClass *dc = DEVICE_CLASS(klass);
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 
+    k->config_write = piix_write_config;
     k->realize = piix4_realize;
     k->vendor_id = PCI_VENDOR_ID_INTEL;
     k->device_id = PCI_DEVICE_ID_INTEL_82371AB_0;