Re: [Qemu-devel] [RFC PATCH v2 1/4] pci: refactor pci_find_capapibilty to get bdf as the first argument instead of the whole pci_device

[Marcel Apfelbaum <marcel@redhat.com>]

Hi Alexandr,

On 23/07/2017 1:11, Aleksandr Bezzubikov wrote:
> Refactor pci_find_capability function to get bdf instead of
> a whole pci_device* as the only necessary field for this function
> is still bdf.
> It greatly helps when we have bdf but not pci_device.

You can drop the last sentence. Other than that:


Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>


Thanks,
Marcel

> 
> Signed-off-by: Aleksandr Bezzubikov <zuban32s@gmail.com>
> ---
>   src/fw/pciinit.c    |  4 ++--
>   src/hw/pcidevice.c  | 12 ++++++------
>   src/hw/pcidevice.h  |  2 +-
>   src/hw/virtio-pci.c |  4 ++--
>   4 files changed, 11 insertions(+), 11 deletions(-)
> 
> diff --git a/src/fw/pciinit.c b/src/fw/pciinit.c
> index 08221e6..864954f 100644
> --- a/src/fw/pciinit.c
> +++ b/src/fw/pciinit.c
> @@ -762,7 +762,7 @@ static int pci_bus_hotplug_support(struct pci_bus *bus, u8 pcie_cap)
>           return downstream_port && slot_implemented;
>       }
>   
> -    shpc_cap = pci_find_capability(bus->bus_dev, PCI_CAP_ID_SHPC, 0);
> +    shpc_cap = pci_find_capability(bus->bus_dev->bdf, PCI_CAP_ID_SHPC, 0);
>       return !!shpc_cap;
>   }
>   
> @@ -844,7 +844,7 @@ static int pci_bios_check_devices(struct pci_bus *busses)
>                */
>               parent = &busses[0];
>           int type;
> -        u8 pcie_cap = pci_find_capability(s->bus_dev, PCI_CAP_ID_EXP, 0);
> +        u8 pcie_cap = pci_find_capability(s->bus_dev->bdf, PCI_CAP_ID_EXP, 0);
>           int hotplug_support = pci_bus_hotplug_support(s, pcie_cap);
>           for (type = 0; type < PCI_REGION_TYPE_COUNT; type++) {
>               u64 align = (type == PCI_REGION_TYPE_IO) ?
> diff --git a/src/hw/pcidevice.c b/src/hw/pcidevice.c
> index cfebf66..d01e27b 100644
> --- a/src/hw/pcidevice.c
> +++ b/src/hw/pcidevice.c
> @@ -134,25 +134,25 @@ pci_find_init_device(const struct pci_device_id *ids, void *arg)
>       return NULL;
>   }
>   
> -u8 pci_find_capability(struct pci_device *pci, u8 cap_id, u8 cap)
> +u8 pci_find_capability(u16 bdf, u8 cap_id, u8 cap)
>   {
>       int i;
> -    u16 status = pci_config_readw(pci->bdf, PCI_STATUS);
> +    u16 status = pci_config_readw(bdf, PCI_STATUS);
>   
>       if (!(status & PCI_STATUS_CAP_LIST))
>           return 0;
>   
>       if (cap == 0) {
>           /* find first */
> -        cap = pci_config_readb(pci->bdf, PCI_CAPABILITY_LIST);
> +        cap = pci_config_readb(bdf, PCI_CAPABILITY_LIST);
>       } else {
>           /* find next */
> -        cap = pci_config_readb(pci->bdf, cap + PCI_CAP_LIST_NEXT);
> +        cap = pci_config_readb(bdf, cap + PCI_CAP_LIST_NEXT);
>       }
>       for (i = 0; cap && i <= 0xff; i++) {
> -        if (pci_config_readb(pci->bdf, cap + PCI_CAP_LIST_ID) == cap_id)
> +        if (pci_config_readb(bdf, cap + PCI_CAP_LIST_ID) == cap_id)
>               return cap;
> -        cap = pci_config_readb(pci->bdf, cap + PCI_CAP_LIST_NEXT);
> +        cap = pci_config_readb(bdf, cap + PCI_CAP_LIST_NEXT);
>       }
>   
>       return 0;
> diff --git a/src/hw/pcidevice.h b/src/hw/pcidevice.h
> index 354b549..adcc75a 100644
> --- a/src/hw/pcidevice.h
> +++ b/src/hw/pcidevice.h
> @@ -69,7 +69,7 @@ int pci_init_device(const struct pci_device_id *ids
>                       , struct pci_device *pci, void *arg);
>   struct pci_device *pci_find_init_device(const struct pci_device_id *ids
>                                           , void *arg);
> -u8 pci_find_capability(struct pci_device *pci, u8 cap_id, u8 cap);
> +u8 pci_find_capability(u16 bdf, u8 cap_id, u8 cap);
>   void pci_enable_busmaster(struct pci_device *pci);
>   u16 pci_enable_iobar(struct pci_device *pci, u32 addr);
>   void *pci_enable_membar(struct pci_device *pci, u32 addr);
> diff --git a/src/hw/virtio-pci.c b/src/hw/virtio-pci.c
> index e5c2c33..4e33033 100644
> --- a/src/hw/virtio-pci.c
> +++ b/src/hw/virtio-pci.c
> @@ -381,7 +381,7 @@ fail:
>   
>   void vp_init_simple(struct vp_device *vp, struct pci_device *pci)
>   {
> -    u8 cap = pci_find_capability(pci, PCI_CAP_ID_VNDR, 0);
> +    u8 cap = pci_find_capability(pci->bdf, PCI_CAP_ID_VNDR, 0);
>       struct vp_cap *vp_cap;
>       const char *mode;
>       u32 offset, base, mul;
> @@ -479,7 +479,7 @@ void vp_init_simple(struct vp_device *vp, struct pci_device *pci)
>                       vp_cap->cap, type, vp_cap->bar, addr, offset, mode);
>           }
>   
> -        cap = pci_find_capability(pci, PCI_CAP_ID_VNDR, cap);
> +        cap = pci_find_capability(pci->bdf, PCI_CAP_ID_VNDR, cap);
>       }
>   
>       if (vp->common.cap && vp->notify.cap && vp->isr.cap && vp->device.cap) {
>