[Qemu-devel] [PATCH 11/15] piix3: introduce register_set_irq and register_map_irq

[stefano.stabellini@eu.citrix.com]

From: Anthony PERARD <anthony.perard@citrix.com>

This patch introduces a generic function registration mechanism for
set_irq and map_irq in piix3, so that the two calls can be
overridden with platform specific functions whenever needed.
The patch also implements and registers the Xen specific version of the
functions.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 hw/pc.h             |    3 +++
 hw/piix_pci.c       |   17 ++++++++++++++++-
 hw/xen_machine_fv.c |   14 ++++++++++++++
 3 files changed, 33 insertions(+), 1 deletions(-)

diff --git a/hw/pc.h b/hw/pc.h
index 63b0249..ee562cd 100644
--- a/hw/pc.h
+++ b/hw/pc.h
@@ -5,6 +5,7 @@
 #include "ioport.h"
 #include "isa.h"
 #include "fdc.h"
+#include "pci.h"
 
 /* PC-style peripherals (also used by other machines).  */
 
@@ -138,6 +139,8 @@ int pcspk_audio_init(qemu_irq *pic);
 struct PCII440FXState;
 typedef struct PCII440FXState PCII440FXState;
 
+void piix3_register_set_irq(pci_set_irq_fn set_irq);
+void piix3_register_map_irq(pci_map_irq_fn map_irq);
 PCIBus *i440fx_init(PCII440FXState **pi440fx_state, int *piix_devfn, qemu_irq *pic, ram_addr_t ram_size);
 void i440fx_init_memory_mappings(PCII440FXState *d);
 
diff --git a/hw/piix_pci.c b/hw/piix_pci.c
index f152a0f..56e3f61 100644
--- a/hw/piix_pci.c
+++ b/hw/piix_pci.c
@@ -55,6 +55,21 @@ struct PCII440FXState {
 #define I440FX_SMRAM    0x72
 
 static void piix3_set_irq(void *opaque, int irq_num, int level);
+static int pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num);
+
+static pci_set_irq_fn piix3_set_irq_handler = piix3_set_irq;
+static pci_map_irq_fn piix3_map_irq_handler = pci_slot_get_pirq;
+
+/* Must be called before call i440fx_init() */
+void piix3_register_set_irq(pci_set_irq_fn set_irq)
+{
+    piix3_set_irq_handler = set_irq;
+}
+
+void piix3_register_map_irq(pci_map_irq_fn map_irq)
+{
+    piix3_map_irq_handler = map_irq;
+}
 
 /* return the global irq number corresponding to a given device irq
    pin. We could also use the bus number to have a more precise
@@ -235,7 +250,7 @@ PCIBus *i440fx_init(PCII440FXState **pi440fx_state, int *piix3_devfn, qemu_irq *
     piix3 = DO_UPCAST(PIIX3State, dev,
                       pci_create_simple_multifunction(b, -1, true, "PIIX3"));
     piix3->pic = pic;
-    pci_bus_irqs(b, piix3_set_irq, pci_slot_get_pirq, piix3, 4);
+    pci_bus_irqs(b, piix3_set_irq_handler, piix3_map_irq_handler, piix3, 4);
     (*pi440fx_state)->piix3 = piix3;
 
     *piix3_devfn = piix3->dev.devfn;
diff --git a/hw/xen_machine_fv.c b/hw/xen_machine_fv.c
index 58237d6..5d553b6 100644
--- a/hw/xen_machine_fv.c
+++ b/hw/xen_machine_fv.c
@@ -50,6 +50,18 @@ static void xen_vm_change_state_handler(void *opaque, int running, int reason)
         xen_main_loop_prepare();
 }
 
+static int xen_piix3_map_irq(PCIDevice *pci_dev, int irq_num)
+{
+    return irq_num + ((pci_dev->devfn >> 3) << 2);
+}
+
+static void xen_piix3_set_irq(void *opaque, int irq_num, int level)
+{
+    xc_hvm_set_pci_intx_level(xen_xc, xen_domid, 0, 0, irq_num >> 2,
+            irq_num & 3, level);
+}
+
+
 static void xen_init_fv(ram_addr_t ram_size,
                         const char *boot_device,
                         const char *kernel_filename,
@@ -126,6 +138,8 @@ static void xen_init_fv(ram_addr_t ram_size,
 
     isa_irq = qemu_allocate_irqs(isa_irq_handler, isa_irq_state, 24);
 
+    piix3_register_set_irq(xen_piix3_set_irq);
+    piix3_register_map_irq(xen_piix3_map_irq);
     pci_bus = i440fx_init(&i440fx_state, &piix3_devfn, isa_irq, ram_size);
     isa_bus_irqs(isa_irq);
 
-- 
1.7.0.4