Re: [Qemu-devel] [PATCH v4 6/6] hw/arm/virt: add dynamic sysbus device support

[Alexander Graf <agraf@suse.de>]

On 31.10.14 14:53, Eric Auger wrote:
> Allows sysbus devices to be instantiated from command line by
> using -device option. Machvirt creates a platform bus at init.
> The dynamic sysbus devices are attached to a platform bus device.
> 
> The platform bus device registers a machine init done notifier
> whose role will be to bind the dynamic sysbus devices. Indeed
> dynamic sysbus devices are created after machine init.
> 
> machvirt also registers a notifier that will start the VFIO
> dynamic device IRQ handling.
> 
> Signed-off-by: Alexander Graf <agraf@suse.de>
> Signed-off-by: Eric Auger <eric.auger@linaro.org>
> 
> ---
> v3 -> v4:
> - use platform bus object, instantiated in create_platform_bus
> - device tree generation for platform bus and children dynamic
>   sysbus devices is no more handled at reset but in a
>   machine_init_done_notifier (due to the change in implementaion
>   of ARM load dtb using rom_add_blob_fixed).
> - device tree enhancement now takes into account the case of
>   user provided dtb. Before the user dtb was overwritten which
>   was wrong. However in case the dtb is provided by the user,
>   dynamic sysbus nodes are not added there.
> - renaming of MACHVIRT_PLATFORM defines
> - MACHVIRT_PLATFORM_PAGE_SHIFT and SIZE_PAGES not needed anymore,
>   hence removed.
> - DynSysbusParams struct renamed into ARMPlatformBusSystemParams
>   and above params removed.
> - separation of dt creation and QEMU binding is not mandated anymore
>   since the device tree is not created from scratch anymore. Instead
>   the modify_dtb function is used.
> - create_platform_bus registers another machine init done notifier
>   to start VFIO IRQ handling. This latter executes after the
>   dynamic sysbus device binding.
> 
> v2 -> v3:
> - renaming of arm_platform_bus_create_devtree and arm_load_dtb
> - add copyright in hw/arm/dyn_sysbus_devtree.c
> 
> v1 -> v2:
> - remove useless vfio-platform.h include file
> - s/MACHVIRT_PLATFORM_HOLE/MACHVIRT_PLATFORM_SIZE
> - use dyn_sysbus_binding and dyn_sysbus_devtree
> - dynamic sysbus platform buse size shrinked to 4MB and
>   moved between RTC and MMIO
> 
> v1:
> 
> Inspired from what Alex Graf did in ppc e500
> https://lists.gnu.org/archive/html/qemu-ppc/2014-07/msg00012.html
> 
> Conflicts:
> 	hw/arm/sysbus-fdt.c
> ---
>  hw/arm/virt.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 59 insertions(+)
> 
> diff --git a/hw/arm/virt.c b/hw/arm/virt.c
> index 78f618d..3a09d58 100644
> --- a/hw/arm/virt.c
> +++ b/hw/arm/virt.c
> @@ -42,6 +42,8 @@
>  #include "exec/address-spaces.h"
>  #include "qemu/bitops.h"
>  #include "qemu/error-report.h"
> +#include "hw/arm/sysbus-fdt.h"
> +#include "hw/platform-bus.h"
>  
>  #define NUM_VIRTIO_TRANSPORTS 32
>  
> @@ -59,6 +61,11 @@
>  #define GIC_FDT_IRQ_PPI_CPU_START 8
>  #define GIC_FDT_IRQ_PPI_CPU_WIDTH 8
>  
> +#define PLATFORM_BUS_BASE         0x9400000
> +#define PLATFORM_BUS_SIZE         (4ULL * 1024 * 1024)
> +#define PLATFORM_BUS_FIRST_IRQ    48
> +#define PLATFORM_BUS_NUM_IRQS     20
> +
>  enum {
>      VIRT_FLASH,
>      VIRT_MEM,
> @@ -68,6 +75,7 @@ enum {
>      VIRT_UART,
>      VIRT_MMIO,
>      VIRT_RTC,
> +    VIRT_PLATFORM_BUS,
>  };
>  
>  typedef struct MemMapEntry {
> @@ -107,6 +115,7 @@ static const MemMapEntry a15memmap[] = {
>      [VIRT_GIC_CPU] =    { 0x08010000, 0x00010000 },
>      [VIRT_UART] =       { 0x09000000, 0x00001000 },
>      [VIRT_RTC] =        { 0x09010000, 0x00001000 },
> +    [VIRT_PLATFORM_BUS] = {PLATFORM_BUS_BASE , PLATFORM_BUS_SIZE},
>      [VIRT_MMIO] =       { 0x0a000000, 0x00000200 },
>      /* ...repeating for a total of NUM_VIRTIO_TRANSPORTS, each of that size */
>      /* 0x10000000 .. 0x40000000 reserved for PCI */
> @@ -117,6 +126,14 @@ static const int a15irqmap[] = {
>      [VIRT_UART] = 1,
>      [VIRT_RTC] = 2,
>      [VIRT_MMIO] = 16, /* ...to 16 + NUM_VIRTIO_TRANSPORTS - 1 */
> +    [VIRT_PLATFORM_BUS] = PLATFORM_BUS_FIRST_IRQ,
> +};
> +
> +ARMPlatformBusSystemParams platform_bus_params = {

static const?


Alex