[PATCH 2/3] powerpc/pcidn: Make VF pci_dn management CONFIG_PCI_IOV specific

[Sam Bobroff]

On Wed, Aug 21, 2019 at 04:26:54PM +1000, Oliver O'Halloran wrote:
> The powerpc PCI code requires that a pci_dn structure exists for all
> devices in the system. This is fine for real devices since at boot a pci_dn
> is created for each PCI device in the DT and it's fine for hotplugged devices
> since the hotplug slot driver will manage the pci_dn's devices in hotplug
> slots. For SR-IOV, we need the platform / pcibios to manage the pci_dn for
> virtual functions since firmware is unaware of VFs, and they aren't
> "hot plugged" in the traditional sense.
> 
> Management of the pci_dn is handled by the, poorly named, functions:
> add_pci_dev_data() and remove_pci_dev_data(). The entire body of these
> functions is #ifdef`ed around CONFIG_PCI_IOV and they cannot be used
> in any other context, so make them only available when CONFIG_PCI_IOV
> is selected, and rename them to reflect their actual usage rather than
> having them masquerade as generic code.
> 
> Signed-off-by: Oliver O'Halloran <oohall at gmail.com>

Nice cleanup,

Reviewed-by: Sam Bobroff <sbobroff at linux.ibm.com>

> ---
>  arch/powerpc/include/asm/pci-bridge.h     |  7 +++++--
>  arch/powerpc/kernel/pci_dn.c              | 15 +++++----------
>  arch/powerpc/platforms/powernv/pci-ioda.c |  4 ++--
>  arch/powerpc/platforms/pseries/pci.c      |  4 ++--
>  4 files changed, 14 insertions(+), 16 deletions(-)
> 
> diff --git a/arch/powerpc/include/asm/pci-bridge.h b/arch/powerpc/include/asm/pci-bridge.h
> index ea6ec65..69f4cb3 100644
> --- a/arch/powerpc/include/asm/pci-bridge.h
> +++ b/arch/powerpc/include/asm/pci-bridge.h
> @@ -223,12 +223,15 @@ struct pci_dn {
>  extern struct pci_dn *pci_get_pdn_by_devfn(struct pci_bus *bus,
>  					   int devfn);
>  extern struct pci_dn *pci_get_pdn(struct pci_dev *pdev);
> -extern struct pci_dn *add_dev_pci_data(struct pci_dev *pdev);
> -extern void remove_dev_pci_data(struct pci_dev *pdev);
>  extern struct pci_dn *pci_add_device_node_info(struct pci_controller *hose,
>  					       struct device_node *dn);
>  extern void pci_remove_device_node_info(struct device_node *dn);
>  
> +#ifdef CONFIG_PCI_IOV
> +struct pci_dn *add_sriov_vf_pdns(struct pci_dev *pdev);
> +void remove_sriov_vf_pdns(struct pci_dev *pdev);
> +#endif
> +
>  static inline int pci_device_from_OF_node(struct device_node *np,
>  					  u8 *bus, u8 *devfn)
>  {
> diff --git a/arch/powerpc/kernel/pci_dn.c b/arch/powerpc/kernel/pci_dn.c
> index 795c4e3..24da1d8 100644
> --- a/arch/powerpc/kernel/pci_dn.c
> +++ b/arch/powerpc/kernel/pci_dn.c
> @@ -125,7 +125,7 @@ struct pci_dn *pci_get_pdn(struct pci_dev *pdev)
>  }
>  
>  #ifdef CONFIG_PCI_IOV
> -static struct pci_dn *add_one_dev_pci_data(struct pci_dn *parent,
> +static struct pci_dn *add_one_sriov_vf_pdn(struct pci_dn *parent,
>  					   int vf_index,
>  					   int busno, int devfn)
>  {
> @@ -151,11 +151,9 @@ static struct pci_dn *add_one_dev_pci_data(struct pci_dn *parent,
>  
>  	return pdn;
>  }
> -#endif
>  
> -struct pci_dn *add_dev_pci_data(struct pci_dev *pdev)
> +struct pci_dn *add_sriov_vf_pdns(struct pci_dev *pdev)
>  {
> -#ifdef CONFIG_PCI_IOV
>  	struct pci_dn *parent, *pdn;
>  	int i;
>  
> @@ -176,7 +174,7 @@ struct pci_dn *add_dev_pci_data(struct pci_dev *pdev)
>  	for (i = 0; i < pci_sriov_get_totalvfs(pdev); i++) {
>  		struct eeh_dev *edev __maybe_unused;
>  
> -		pdn = add_one_dev_pci_data(parent, i,
> +		pdn = add_one_sriov_vf_pdn(parent, i,
>  					   pci_iov_virtfn_bus(pdev, i),
>  					   pci_iov_virtfn_devfn(pdev, i));
>  		if (!pdn) {
> @@ -192,14 +190,11 @@ struct pci_dn *add_dev_pci_data(struct pci_dev *pdev)
>  		edev->physfn = pdev;
>  #endif /* CONFIG_EEH */
>  	}
> -#endif /* CONFIG_PCI_IOV */
> -
>  	return pci_get_pdn(pdev);
>  }
>  
> -void remove_dev_pci_data(struct pci_dev *pdev)
> +void remove_sriov_vf_pdns(struct pci_dev *pdev)
>  {
> -#ifdef CONFIG_PCI_IOV
>  	struct pci_dn *parent;
>  	struct pci_dn *pdn, *tmp;
>  	int i;
> @@ -271,8 +266,8 @@ void remove_dev_pci_data(struct pci_dev *pdev)
>  			kfree(pdn);
>  		}
>  	}
> -#endif /* CONFIG_PCI_IOV */
>  }
> +#endif /* CONFIG_PCI_IOV */
>  
>  struct pci_dn *pci_add_device_node_info(struct pci_controller *hose,
>  					struct device_node *dn)
> diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
> index d8080558d0..f1fa489 100644
> --- a/arch/powerpc/platforms/powernv/pci-ioda.c
> +++ b/arch/powerpc/platforms/powernv/pci-ioda.c
> @@ -1719,14 +1719,14 @@ int pnv_pcibios_sriov_disable(struct pci_dev *pdev)
>  	pnv_pci_sriov_disable(pdev);
>  
>  	/* Release PCI data */
> -	remove_dev_pci_data(pdev);
> +	remove_sriov_vf_pdns(pdev);
>  	return 0;
>  }
>  
>  int pnv_pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
>  {
>  	/* Allocate PCI data */
> -	add_dev_pci_data(pdev);
> +	add_sriov_vf_pdns(pdev);
>  
>  	return pnv_pci_sriov_enable(pdev, num_vfs);
>  }
> diff --git a/arch/powerpc/platforms/pseries/pci.c b/arch/powerpc/platforms/pseries/pci.c
> index 7228309..911534b 100644
> --- a/arch/powerpc/platforms/pseries/pci.c
> +++ b/arch/powerpc/platforms/pseries/pci.c
> @@ -192,7 +192,7 @@ int pseries_pci_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
>  int pseries_pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
>  {
>  	/* Allocate PCI data */
> -	add_dev_pci_data(pdev);
> +	add_sriov_vf_pdns(pdev);
>  	return pseries_pci_sriov_enable(pdev, num_vfs);
>  }
>  
> @@ -204,7 +204,7 @@ int pseries_pcibios_sriov_disable(struct pci_dev *pdev)
>  	/* Releasing pe_num_map */
>  	kfree(pdn->pe_num_map);
>  	/* Release PCI data */
> -	remove_dev_pci_data(pdev);
> +	remove_sriov_vf_pdns(pdev);
>  	pci_vf_drivers_autoprobe(pdev, true);
>  	return 0;
>  }
> -- 
> 2.9.5
> 
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