| Message ID | 20180420162814.46077.11939.stgit@ahduyck-green-test.jf.intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 4/20/2018 9:28 AM, Alexander Duyck wrote: > This patch adds a common configuration function called > pci_sriov_configure_simple that will allow for managing VFs on devices > where the PF is not capable of managing VF resources. > > Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> > Tested-by: Mark Rustad <mark.d.rustad@intel.com> > --- > > v5: New patch replacing pci_sriov_configure_unmanaged with > pci_sriov_configure_simple > Dropped bits related to autoprobe changes > v6: Defined pci_sriov_configure_simple as NULL if IOV is disabled > v7: Updated pci_sriov_configure_simple to drop need for err value > Fixed comment explaining why pci_sriov_configure_simple is NULL > > drivers/pci/iov.c | 31 +++++++++++++++++++++++++++++++ > include/linux/pci.h | 3 +++ > 2 files changed, 34 insertions(+) > > diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c > index 677924a..3e0a7fd 100644 > --- a/drivers/pci/iov.c > +++ b/drivers/pci/iov.c > @@ -807,3 +807,34 @@ int pci_sriov_get_totalvfs(struct pci_dev *dev) > return dev->sriov->total_VFs; > } > EXPORT_SYMBOL_GPL(pci_sriov_get_totalvfs); > + > +/** > + * pci_sriov_configure_simple - helper to configure unmanaged SR-IOV > + * @dev: the PCI device > + * @nr_virtfn: number of virtual functions to enable, 0 to disable > + * > + * Used to provide generic enable/disable SR-IOV option for devices > + * that do not manage the VFs generated by their driver. Return value > + * is negative on error, or number of VFs allocated on success. > + */ > +int pci_sriov_configure_simple(struct pci_dev *dev, int nr_virtfn) > +{ > + might_sleep(); > + > + if (!dev->is_physfn) > + return -ENODEV; > + > + if (pci_vfs_assigned(dev)) { > + pci_warn(dev, > + "Cannot modify SR-IOV while VFs are assigned\n"); > + return -EPERM; > + } > + > + if (!nr_virtfn) { > + sriov_disable(dev); > + return 0; > + } > + > + return sriov_enable(dev, nr_virtfn) ? : nr_virtfn; > +} > +EXPORT_SYMBOL_GPL(pci_sriov_configure_simple); > diff --git a/include/linux/pci.h b/include/linux/pci.h > index ae42289..7d36e39 100644 > --- a/include/linux/pci.h > +++ b/include/linux/pci.h > @@ -1955,6 +1955,7 @@ static inline void pci_mmcfg_late_init(void) { } > int pci_vfs_assigned(struct pci_dev *dev); > int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs); > int pci_sriov_get_totalvfs(struct pci_dev *dev); > +int pci_sriov_configure_simple(struct pci_dev *dev, int nr_virtfn); > resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno); > void pci_vf_drivers_autoprobe(struct pci_dev *dev, bool probe); > #else > @@ -1982,6 +1983,8 @@ static inline int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs) > { return 0; } > static inline int pci_sriov_get_totalvfs(struct pci_dev *dev) > { return 0; } > +/* this is expected to be used as a function pointer, just define as NULL */ > +#define pci_sriov_configure_simple NULL > static inline resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno) > { return 0; } > static inline void pci_vf_drivers_autoprobe(struct pci_dev *dev, bool probe) { } > Thanks Alex! Reviewed-by: Greg Rose <gvrose8192@gmail.com>
Looks good,
Reviewed-by: Christoph Hellwig <hch@lst.de>
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index 677924a..3e0a7fd 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -807,3 +807,34 @@ int pci_sriov_get_totalvfs(struct pci_dev *dev) return dev->sriov->total_VFs; } EXPORT_SYMBOL_GPL(pci_sriov_get_totalvfs); + +/** + * pci_sriov_configure_simple - helper to configure unmanaged SR-IOV + * @dev: the PCI device + * @nr_virtfn: number of virtual functions to enable, 0 to disable + * + * Used to provide generic enable/disable SR-IOV option for devices + * that do not manage the VFs generated by their driver. Return value + * is negative on error, or number of VFs allocated on success. + */ +int pci_sriov_configure_simple(struct pci_dev *dev, int nr_virtfn) +{ + might_sleep(); + + if (!dev->is_physfn) + return -ENODEV; + + if (pci_vfs_assigned(dev)) { + pci_warn(dev, + "Cannot modify SR-IOV while VFs are assigned\n"); + return -EPERM; + } + + if (!nr_virtfn) { + sriov_disable(dev); + return 0; + } + + return sriov_enable(dev, nr_virtfn) ? : nr_virtfn; +} +EXPORT_SYMBOL_GPL(pci_sriov_configure_simple); diff --git a/include/linux/pci.h b/include/linux/pci.h index ae42289..7d36e39 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1955,6 +1955,7 @@ static inline void pci_mmcfg_late_init(void) { } int pci_vfs_assigned(struct pci_dev *dev); int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs); int pci_sriov_get_totalvfs(struct pci_dev *dev); +int pci_sriov_configure_simple(struct pci_dev *dev, int nr_virtfn); resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno); void pci_vf_drivers_autoprobe(struct pci_dev *dev, bool probe); #else @@ -1982,6 +1983,8 @@ static inline int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs) { return 0; } static inline int pci_sriov_get_totalvfs(struct pci_dev *dev) { return 0; } +/* this is expected to be used as a function pointer, just define as NULL */ +#define pci_sriov_configure_simple NULL static inline resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno) { return 0; } static inline void pci_vf_drivers_autoprobe(struct pci_dev *dev, bool probe) { }