Re: [PATCH-for-5.1 1/3] hw/ide/ahci: Use qdev gpio rather than qemu_allocate_irqs()

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

[sending again as my previous mail was rejected, sorry if you get this
twice]

On 4/12/20 11:29 PM, Philippe Mathieu-Daudé wrote:
> Switch to using the qdev gpio API which is preferred over
> qemu_allocate_irqs(). One step to eventually deprecate and
> remove qemu_allocate_irqs() one day.
> 
> Patch created mechanically using spatch with this script
> inspired from commit d6ef883d9d7:
> 
>   @@
>   typedef qemu_irq;
>   identifier irqs, handler;
>   expression opaque, count, i;
>   @@
>   -   qemu_irq *irqs;
>       ...
>   -   irqs = qemu_allocate_irqs(handler, opaque, count);
>   +   qdev_init_gpio_in(DEVICE(opaque), handler, count);
>       <+...
>   -   irqs[i]
>   +   qdev_get_gpio_in(DEVICE(opaque), i)
>       ...+>
>   ?-  g_free(irqs);
> 
> Inspired-by: Peter Maydell <peter.maydell@linaro.org>
> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> ---
>  hw/ide/ahci.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
> index 13d91e109a..ef0a0a22ee 100644
> --- a/hw/ide/ahci.c
> +++ b/hw/ide/ahci.c
> @@ -1534,19 +1534,18 @@ void ahci_init(AHCIState *s, DeviceState *qdev)
>  
>  void ahci_realize(AHCIState *s, DeviceState *qdev, AddressSpace *as, int ports)
>  {
> -    qemu_irq *irqs;
>      int i;
>  
>      s->as = as;
>      s->ports = ports;
>      s->dev = g_new0(AHCIDevice, ports);
>      ahci_reg_init(s);
> -    irqs = qemu_allocate_irqs(ahci_irq_set, s, s->ports);
> +    qdev_init_gpio_in(DEVICE(s), ahci_irq_set, s->ports);

This is wrong as AHCIState is not a QOM DEVICE... see commit bb639f829f1:

---
diff --git a/hw/ide/ahci.h b/hw/ide/ahci.h
index c055d6ba6b..c9b3805415 100644
--- a/hw/ide/ahci.h
+++ b/hw/ide/ahci.h
@@ -287,6 +287,8 @@ struct AHCIDevice {
 };

 typedef struct AHCIState {
+    DeviceState *container;
+
     AHCIDevice *dev;
     AHCIControlRegs control_regs;
     MemoryRegion mem;
diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
index 02d85fa0e9..d83efa47a4 100644
--- a/hw/ide/ahci.c
+++ b/hw/ide/ahci.c
@@ -121,9 +121,9 @@ static uint32_t  ahci_port_read(AHCIState *s, int
port, int offset)

 static void ahci_irq_raise(AHCIState *s, AHCIDevice *dev)
 {
-    AHCIPCIState *d = container_of(s, AHCIPCIState, ahci);
-    PCIDevice *pci_dev =
-        (PCIDevice *)object_dynamic_cast(OBJECT(d), TYPE_PCI_DEVICE);
+    DeviceState *dev_state = s->container;
+    PCIDevice *pci_dev = (PCIDevice *)
object_dynamic_cast(OBJECT(dev_state),
+
TYPE_PCI_DEVICE);

     DPRINTF(0, "raise irq\n");

@@ -136,9 +136,9 @@ static void ahci_irq_raise(AHCIState *s, AHCIDevice
*dev)

 static void ahci_irq_lower(AHCIState *s, AHCIDevice *dev)
 {
-    AHCIPCIState *d = container_of(s, AHCIPCIState, ahci);
-    PCIDevice *pci_dev =
-        (PCIDevice *)object_dynamic_cast(OBJECT(d), TYPE_PCI_DEVICE);
+    DeviceState *dev_state = s->container;
+    PCIDevice *pci_dev = (PCIDevice *)
object_dynamic_cast(OBJECT(dev_state),
+
TYPE_PCI_DEVICE);

     DPRINTF(0, "lower irq\n");

@@ -1436,6 +1436,7 @@ void ahci_init(AHCIState *s, DeviceState *qdev,
AddressSpace *as, int ports)
     s->as = as;
     s->ports = ports;
     s->dev = g_new0(AHCIDevice, ports);
+    s->container = qdev;
     ahci_reg_init(s);
     /* XXX BAR size should be 1k, but that breaks, so bump it to 4k for
now */
     memory_region_init_io(&s->mem, OBJECT(qdev), &ahci_mem_ops, s,
---

Using s/DEVICE(s)/qdev/ works although.

>      for (i = 0; i < s->ports; i++) {
>          AHCIDevice *ad = &s->dev[i];
>  
>          ide_bus_new(&ad->port, sizeof(ad->port), qdev, i, 1);
> -        ide_init2(&ad->port, irqs[i]);
> +        ide_init2(&ad->port, qdev_get_gpio_in(DEVICE(s), i));
>  
>          ad->hba = s;
>          ad->port_no = i;
> @@ -1554,7 +1553,6 @@ void ahci_realize(AHCIState *s, DeviceState *qdev, AddressSpace *as, int ports)
>          ad->port.dma->ops = &ahci_dma_ops;
>          ide_register_restart_cb(&ad->port);
>      }
> -    g_free(irqs);
>  }
>  
>  void ahci_uninit(AHCIState *s)
>