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powerpc/pcidn: Make VF pci_dn management CONFIG_PCI_IOV specific 

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@gmail.com>
Reviewed-by: Sam Bobroff <sbobroff@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190821062655.19735-2-oohall@gmail.com
This commit is contained in:
Oliver O'Halloran 2019-08-21 16:26:54 +10:00 committed by Michael Ellerman
parent 1fb4124ca9
commit 8cd6aacc64
4 changed files with 14 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/powerpc/include/asm/pci-bridge.h
View File

@ -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)
{

15
arch/powerpc/kernel/pci_dn.c
View File

@ -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)

4
arch/powerpc/platforms/powernv/pci-ioda.c
View File

@ -1747,14 +1747,14 @@ 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);
}

4
arch/powerpc/platforms/pseries/pci.c
View File

@ -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;
}