qemu: pci hotplug GPE support (Marcelo Tosatti)

Enable the corresponding bit on the PCIST region and trigger the SCI
and handle the _EJ0 notifications.
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6608 c046a42c-6fe2-441c-8c8c-71466251a162

hw/acpi.c

@@ -563,13 +563,21 @@ void qemu_system_powerdown(void)
 #endif
 
 #define GPE_BASE 0xafe0
+#define PCI_BASE 0xae00
+#define PCI_EJ_BASE 0xae08
 
 struct gpe_regs {
     uint16_t sts; /* status */
     uint16_t en;  /* enabled */
 };
 
+struct pci_status {
+    uint32_t up;
+    uint32_t down;
+};
+
 static struct gpe_regs gpe;
+static struct pci_status pci0_status;
 
 static uint32_t gpe_readb(void *opaque, uint32_t addr)
 {
@@ -623,9 +631,95 @@ static void gpe_writeb(void *opaque, uint32_t addr, uint32_t val)
 #endif
 }
 
+static uint32_t pcihotplug_read(void *opaque, uint32_t addr)
+{
+    uint32_t val = 0;
+    struct pci_status *g = opaque;
+    switch (addr) {
+        case PCI_BASE:
+            val = g->up;
+            break;
+        case PCI_BASE + 4:
+            val = g->down;
+            break;
+        default:
+            break;
+    }
+
+#if defined(DEBUG)
+    printf("pcihotplug read %lx == %lx\n", addr, val);
+#endif
+    return val;
+}
+
+static void pcihotplug_write(void *opaque, uint32_t addr, uint32_t val)
+{
+    struct pci_status *g = opaque;
+    switch (addr) {
+        case PCI_BASE:
+            g->up = val;
+            break;
+        case PCI_BASE + 4:
+            g->down = val;
+            break;
+   }
+
+#if defined(DEBUG)
+    printf("pcihotplug write %lx <== %d\n", addr, val);
+#endif
+}
+
+static uint32_t pciej_read(void *opaque, uint32_t addr)
+{
+#if defined(DEBUG)
+    printf("pciej read %lx == %lx\n", addr, val);
+#endif
+    return 0;
+}
+
+static void pciej_write(void *opaque, uint32_t addr, uint32_t val)
+{
+    int slot = ffs(val) - 1;
+
+#if defined(DEBUG)
+    printf("pciej write %lx <== %d\n", addr, val);
+#endif
+}
+
 void qemu_system_hot_add_init(void)
 {
     register_ioport_write(GPE_BASE, 4, 1, gpe_writeb, &gpe);
     register_ioport_read(GPE_BASE, 4, 1,  gpe_readb, &gpe);
 
+    register_ioport_write(PCI_BASE, 8, 4, pcihotplug_write, &pci0_status);
+    register_ioport_read(PCI_BASE, 8, 4,  pcihotplug_read, &pci0_status);
+
+    register_ioport_write(PCI_EJ_BASE, 4, 4, pciej_write, NULL);
+    register_ioport_read(PCI_EJ_BASE, 4, 4,  pciej_read, NULL);
+}
+
+static void enable_device(struct pci_status *p, struct gpe_regs *g, int slot)
+{
+    g->sts |= 2;
+    g->en |= 2;
+    p->up |= (1 << slot);
+}
+
+static void disable_device(struct pci_status *p, struct gpe_regs *g, int slot)
+{
+    g->sts |= 2;
+    g->en |= 2;
+    p->down |= (1 << slot);
+}
+
+void qemu_system_device_hot_add(int bus, int slot, int state)
+{
+    qemu_set_irq(pm_state->irq, 1);
+    pci0_status.up = 0;
+    pci0_status.down = 0;
+    if (state)
+        enable_device(&pci0_status, &gpe, slot);
+    else
+        disable_device(&pci0_status, &gpe, slot);
+    qemu_set_irq(pm_state->irq, 0);
 }

sysemu.h

@@ -168,6 +168,7 @@ extern int drive_init(struct drive_opt *arg, int snapshot, void *machine);
 
 /* acpi */
 void qemu_system_hot_add_init(void);
+void qemu_system_device_hot_add(int pcibus, int slot, int state);
 
 /* serial ports */