Glad you think it's worth it.
Thanks,
Sebastien
________________________________________
From: Philippe Mathieu-Daudé [philmd@redhat.com]
Sent: Monday, October 29, 2018 2:02 PM
To: Samuel Ortiz; qemu-devel@nongnu.org
Cc: Michael S. Tsirkin; Jing Liu; Boeuf, Sebastien; Paolo Bonzini; Igor Mammedov
Subject: Re: [Qemu-devel] [PATCH v3 16/19] hw: acpi: Retrieve the PCI bus from AcpiPciHpState
On 29/10/18 18:01, Samuel Ortiz wrote:
> From: Sebastien Boeuf <sebastien.boeuf@intel.com>
>
> Instead of using the machine type specific method find_i440fx() to
> retrieve the PCI bus, this commit aims to rely on the fact that the
> PCI bus is known by the structure AcpiPciHpState.
>
> When the structure is initialized through acpi_pcihp_init() call,
> it saves the PCI bus, which means there is no need to invoke a
> special function later on.
>
> Based on the fact that find_i440fx() was only used there, this
> patch also removes the function find_i440fx() itself from the
> entire codebase.
Nice :)
>
> Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
> Signed-off-by: Jing Liu <jing2.liu@linux.intel.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
> hw/acpi/pcihp.c | 10 ++++------
> hw/pci-host/piix.c | 8 --------
> include/hw/i386/pc.h | 1 -
> stubs/Makefile.objs | 1 -
> stubs/pci-host-piix.c | 6 ------
> 5 files changed, 4 insertions(+), 22 deletions(-)
> delete mode 100644 stubs/pci-host-piix.c
>
> diff --git a/hw/acpi/pcihp.c b/hw/acpi/pcihp.c
> index 80d42e12ff..254b2e50ab 100644
> --- a/hw/acpi/pcihp.c
> +++ b/hw/acpi/pcihp.c
> @@ -93,10 +93,9 @@ static void *acpi_set_bsel(PCIBus *bus, void *opaque)
> return bsel_alloc;
> }
>
> -static void acpi_set_pci_info(void)
> +static void acpi_set_pci_info(AcpiPciHpState *s)
> {
> static bool bsel_is_set;
> - PCIBus *bus;
> unsigned bsel_alloc = ACPI_PCIHP_BSEL_DEFAULT;
>
> if (bsel_is_set) {
> @@ -104,10 +103,9 @@ static void acpi_set_pci_info(void)
> }
> bsel_is_set = true;
>
> - bus = find_i440fx(); /* TODO: Q35 support */
> - if (bus) {
> + if (s->root) {
> /* Scan all PCI buses. Set property to enable acpi based hotplug. */
> - pci_for_each_bus_depth_first(bus, acpi_set_bsel, NULL, &bsel_alloc);
> + pci_for_each_bus_depth_first(s->root, acpi_set_bsel, NULL, &bsel_alloc);
> }
> }
>
> @@ -213,7 +211,7 @@ static void acpi_pcihp_update(AcpiPciHpState *s)
>
> void acpi_pcihp_reset(AcpiPciHpState *s)
> {
> - acpi_set_pci_info();
> + acpi_set_pci_info(s);
> acpi_pcihp_update(s);
> }
>
> diff --git a/hw/pci-host/piix.c b/hw/pci-host/piix.c
> index da73743fa2..4940f59c9b 100644
> --- a/hw/pci-host/piix.c
> +++ b/hw/pci-host/piix.c
> @@ -445,14 +445,6 @@ PCIBus *i440fx_init(const char *host_type, const char *pci_type,
> return b;
> }
>
> -PCIBus *find_i440fx(void)
> -{
> - PCIHostState *s = OBJECT_CHECK(PCIHostState,
> - object_resolve_path("/machine/i440fx", NULL),
> - TYPE_PCI_HOST_BRIDGE);
> - return s ? s->bus : NULL;
> -}
> -
> /* PIIX3 PCI to ISA bridge */
> static void piix3_set_irq_pic(PIIX3State *piix3, int pic_irq)
> {
> diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
> index 7d177cd207..f6b2649cf8 100644
> --- a/include/hw/i386/pc.h
> +++ b/include/hw/i386/pc.h
> @@ -260,7 +260,6 @@ PCIBus *i440fx_init(const char *host_type, const char *pci_type,
> MemoryRegion *pci_memory,
> MemoryRegion *ram_memory);
>
> -PCIBus *find_i440fx(void);
> /* piix4.c */
> extern PCIDevice *piix4_dev;
> int piix4_init(PCIBus *bus, ISABus **isa_bus, int devfn);
> diff --git a/stubs/Makefile.objs b/stubs/Makefile.objs
> index 5dd0aeeec6..725f78bedc 100644
> --- a/stubs/Makefile.objs
> +++ b/stubs/Makefile.objs
> @@ -41,6 +41,5 @@ stub-obj-y += pc_madt_cpu_entry.o
> stub-obj-y += vmgenid.o
> stub-obj-y += xen-common.o
> stub-obj-y += xen-hvm.o
> -stub-obj-y += pci-host-piix.o
> stub-obj-y += ram-block.o
> stub-obj-y += ramfb.o
> diff --git a/stubs/pci-host-piix.c b/stubs/pci-host-piix.c
> deleted file mode 100644
> index 6ed81b1f21..0000000000
> --- a/stubs/pci-host-piix.c
> +++ /dev/null
> @@ -1,6 +0,0 @@
> -#include "qemu/osdep.h"
> -#include "hw/i386/pc.h"
> -PCIBus *find_i440fx(void)
> -{
> - return NULL;
> -}
>