[21/21] ppc/pnv: Create a default PCI layout

From: Benjamin Herrenschmidt <benh@kernel.crashing.org>

This creates a legacy PCIe->PCI bridge under the PHB by default to which
a bunch of standard devices are attached. Currently:

  - VGA (as specified by -vga)
  - USB (with keyboard and mouse if graphcis is enabled)
  - AHCI
  - e1000

This gives us something close to a standard OpenPower platform.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
[clg: updated for qemu-2.9
      reworked pnv_create_pci_legacy_bridge() ]
Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 hw/ppc/pnv.c | 111 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)

On Wed, Apr 05, 2017 at 02:41:46PM +0200, Cédric Le Goater wrote:
> From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> 
> This creates a legacy PCIe->PCI bridge under the PHB by default to which
> a bunch of standard devices are attached. Currently:
> 
>   - VGA (as specified by -vga)
>   - USB (with keyboard and mouse if graphcis is enabled)
>   - AHCI
>   - e1000
> 
> This gives us something close to a standard OpenPower platform.
> 
> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> [clg: updated for qemu-2.9
>       reworked pnv_create_pci_legacy_bridge() ]
> Signed-off-by: Cédric Le Goater <clg@kaod.org>

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>

Apart from one nit below.

> ---
>  hw/ppc/pnv.c | 111 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 111 insertions(+)
> 
> diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
> index db6e078edcea..766e6cf4bc12 100644
> --- a/hw/ppc/pnv.c
> +++ b/hw/ppc/pnv.c
> @@ -48,6 +48,10 @@
>  #include "hw/pci/pci_bridge.h"
>  #include "hw/pci/msi.h"
>  #include "hw/pci-host/pnv_phb3.h"
> +#include "hw/usb.h"
> +#include "hw/ide/pci.h"
> +#include "hw/ide/ahci.h"
> +#include "net/net.h"
>  
>  #include <libfdt.h>
>  
> @@ -573,6 +577,87 @@ static ISABus *pnv_isa_create(PnvChip *chip)
>      return isa_bus;
>  }
>  
> +
> +/* Returns whether we want to use VGA or not */
> +static int pnv_vga_init(PCIBus *pci_bus)
> +{
> +    switch (vga_interface_type) {
> +    case VGA_NONE:
> +        return false;
> +    case VGA_DEVICE:
> +        return true;
> +    case VGA_STD:
> +    case VGA_VIRTIO:
> +        return pci_vga_init(pci_bus) != NULL;
> +    default:
> +        fprintf(stderr, "This vga model is not supported,"
> +                "currently it only supports -vga std\n");

This message doesn't appear to be entirely accurate, since virtio-vga
is apparently supported above as well.  Also this should probably be
an error_report().

> +        exit(0);
> +    }
> +}
> +
> +static void pnv_nic_init(PCIBus *pci_bus)
> +{
> +    int i;
> +
> +    for (i = 0; i < nb_nics; i++) {
> +        NICInfo *nd = &nd_table[i];
> +        DeviceState *dev;
> +        PCIDevice *pdev;
> +        Error *err = NULL;
> +
> +        pdev = pci_create(pci_bus, -1, "e1000");
> +        dev = &pdev->qdev;
> +        qdev_set_nic_properties(dev, nd);
> +        object_property_set_bool(OBJECT(dev), true, "realized", &err);
> +        if (err) {
> +            error_report_err(err);
> +            object_unparent(OBJECT(dev));
> +            exit(1);
> +        }
> +    }
> +}
> +
> +#define MAX_SATA_PORTS     6
> +
> +static void pnv_storage_init(PCIBus *pci_bus)
> +{
> +    DriveInfo *hd[MAX_SATA_PORTS];
> +    PCIDevice *ahci;
> +
> +    /* Add an AHCI device. We use an ICH9 since that's all we have
> +     * at hand for PCI AHCI but it shouldn't really matter
> +     */
> +    ahci = pci_create_simple(pci_bus, -1, "ich9-ahci");
> +    g_assert(MAX_SATA_PORTS == ICH_AHCI(ahci)->ahci.ports);
> +    ide_drive_get(hd, ICH_AHCI(ahci)->ahci.ports);
> +    ahci_ide_create_devs(ahci, hd);
> +}
> +
> +static PCIBus *pnv_create_pci_legacy_bridge(PnvPhb3State *phb,
> +                                            uint8_t chassis_nr)
> +{
> +    PCIDevice *dev;
> +    PCIHostState *pcih = PCI_HOST_BRIDGE(phb);
> +    PCIDevice *pdev;
> +    PCIBus *parent;
> +
> +    /* Add root complex */
> +    pdev = pci_create_multifunction(pcih->bus, 0, false, TYPE_PNV_PHB3_RC);
> +    qdev_prop_set_uint8(&pdev->qdev, "chassis", phb->chip_id * 4 + phb->phb_id);
> +    qdev_prop_set_uint16(&pdev->qdev, "slot", 1);
> +    qdev_init_nofail(&pdev->qdev);
> +
> +    /* Setup bus for that chip */
> +    parent = pci_bridge_get_sec_bus(PCI_BRIDGE(pdev));
> +
> +    dev = pci_create_multifunction(parent, 0, false, "pci-bridge");
> +    qdev_prop_set_uint8(&dev->qdev, "chassis_nr", chassis_nr);
> +    dev->qdev.id = "pci";
> +    qdev_init_nofail(&dev->qdev);
> +    return pci_bridge_get_sec_bus(PCI_BRIDGE(dev));
> +}
> +
>  static void ppc_powernv_init(MachineState *machine)
>  {
>      PnvMachineState *pnv = POWERNV_MACHINE(machine);
> @@ -581,6 +666,8 @@ static void ppc_powernv_init(MachineState *machine)
>      long fw_size;
>      int i;
>      char *chip_typename;
> +    PCIBus *pbus;
> +    bool has_gfx = false;
>  
>      /* allocate RAM */
>      if (machine->ram_size < (1 * G_BYTE)) {
> @@ -682,6 +769,30 @@ static void ppc_powernv_init(MachineState *machine)
>       * host to powerdown */
>      pnv->powerdown_notifier.notify = pnv_powerdown_notify;
>      qemu_register_powerdown_notifier(&pnv->powerdown_notifier);
> +
> +    /* Add a PCI switch */
> +    pbus = pnv_create_pci_legacy_bridge(pnv->chips[0]->phbs[0], 128);
> +
> +    /* Graphics & USB */
> +    if (pnv_vga_init(pbus)) {
> +        has_gfx = true;
> +        machine->usb |= defaults_enabled() && !machine->usb_disabled;
> +    }
> +    if (machine->usb) {
> +        pci_create_simple(pbus, -1, "nec-usb-xhci");
> +        if (has_gfx) {
> +            USBBus *usb_bus = usb_bus_find(-1);
> +
> +            usb_create_simple(usb_bus, "usb-kbd");
> +            usb_create_simple(usb_bus, "usb-mouse");
> +        }
> +    }
> +
> +    /* Add NIC */
> +    pnv_nic_init(pbus);
> +
> +    /* Add storage */
> +    pnv_storage_init(pbus);
>  }
>  
>  /*

On Wed, 2017-04-05 at 14:41 +0200, Cédric Le Goater wrote:
> From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> 
> This creates a legacy PCIe->PCI bridge under the PHB by default to which
> a bunch of standard devices are attached. Currently:
> 
>   - VGA (as specified by -vga)
>   - USB (with keyboard and mouse if graphcis is enabled)
>   - AHCI
>   - e1000
> 
> This gives us something close to a standard OpenPower platform.

These bridges and devices are not added when -nodefaults
is in use, right?

-- 
Andrea Bolognani / Red Hat / Virtualization

On 04/11/2017 01:10 PM, Andrea Bolognani wrote:
> On Wed, 2017-04-05 at 14:41 +0200, Cédric Le Goater wrote:
>> From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
>>  
>> This creates a legacy PCIe->PCI bridge under the PHB by default to which
>> a bunch of standard devices are attached. Currently:
>>  
>>    - VGA (as specified by -vga)
>>    - USB (with keyboard and mouse if graphcis is enabled)
>>    - AHCI
>>    - e1000
>>  
>> This gives us something close to a standard OpenPower platform.
> 
> These bridges and devices are not added when -nodefaults
> is in use, right?

I haven't checked that yet but I will.

Thanks,

C.

On Tue, 2017-04-11 at 18:50 +0200, Cédric Le Goater wrote:
> > These bridges and devices are not added when -nodefaults
> > is in use, right?
> 
> I haven't checked that yet but I will.

Thanks. This is very important for libvirt, where we need
to have full control of the guest's hardware.

-- 
Andrea Bolognani / Red Hat / Virtualization

On 04/12/2017 10:02 AM, Andrea Bolognani wrote:
> On Tue, 2017-04-11 at 18:50 +0200, Cédric Le Goater wrote:
>>> These bridges and devices are not added when -nodefaults
>>> is in use, right?
>>  
>> I haven't checked that yet but I will.
> 
> Thanks. This is very important for libvirt, where we need
> to have full control of the guest's hardware.

OK. and so, this is not the case. This patch will need to be
a little more subtle to handle -nodefaults.

Thanks,

C.