| Message ID | 20161026180122.23495.26258.stgit@gimli.home (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On Wed, Oct 26, 2016 at 12:01:22PM -0600, Alex Williamson wrote: > Signed-off-by: Alex Williamson <alex.williamson@redhat.com> > --- > drivers/pci/pci.c | 26 ++++++++++++++++++++------ > include/linux/pci.h | 2 ++ > 2 files changed, 22 insertions(+), 6 deletions(-) > > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > index b901ee7..6d6cf89 100644 > --- a/drivers/pci/pci.c > +++ b/drivers/pci/pci.c > @@ -4729,6 +4729,25 @@ int pcie_set_mps(struct pci_dev *dev, int mps) > } > EXPORT_SYMBOL(pcie_set_mps); > > +int pcie_get_link(struct pci_dev *dev, enum pci_bus_speed *speed, > + enum pcie_link_width *width) Seems like "pcie_get_link" is missing a word. I know pcie_get_minimum_link() exists already and is similar. pcie_get_link_speed(), maybe? I know it also gets the width, so maybe there's a more inclusive term that would be better. > +{ > + int ret; > + u16 lnksta; > + > + ret = pcie_capability_read_word(dev, PCI_EXP_LNKSTA, &lnksta); > + if (ret) > + return ret; > + > + if (speed) > + *speed = pcie_link_speed[lnksta & PCI_EXP_LNKSTA_CLS]; > + if (width) > + *width = (lnksta & PCI_EXP_LNKSTA_NLW) >> > + PCI_EXP_LNKSTA_NLW_SHIFT; > + > + return 0; > +} > + > /** > * pcie_get_minimum_link - determine minimum link settings of a PCI device > * @dev: PCI device to query > @@ -4747,18 +4766,13 @@ int pcie_get_minimum_link(struct pci_dev *dev, enum pci_bus_speed *speed, > *width = PCIE_LNK_WIDTH_UNKNOWN; > > while (dev) { > - u16 lnksta; > enum pci_bus_speed next_speed; > enum pcie_link_width next_width; > > - ret = pcie_capability_read_word(dev, PCI_EXP_LNKSTA, &lnksta); > + ret = pcie_get_link(dev, &next_speed, &next_width); > if (ret) > return ret; > > - next_speed = pcie_link_speed[lnksta & PCI_EXP_LNKSTA_CLS]; > - next_width = (lnksta & PCI_EXP_LNKSTA_NLW) >> > - PCI_EXP_LNKSTA_NLW_SHIFT; > - > if (next_speed < *speed) > *speed = next_speed; > > diff --git a/include/linux/pci.h b/include/linux/pci.h > index c3248d5..fbfbb40 100644 > --- a/include/linux/pci.h > +++ b/include/linux/pci.h > @@ -1026,6 +1026,8 @@ static inline int pci_is_managed(struct pci_dev *pdev) > int pcie_set_mps(struct pci_dev *dev, int mps); > int pcie_get_minimum_link(struct pci_dev *dev, enum pci_bus_speed *speed, > enum pcie_link_width *width); > +int pcie_get_link(struct pci_dev *dev, enum pci_bus_speed *speed, > + enum pcie_link_width *width); > int __pci_reset_function(struct pci_dev *dev); > int __pci_reset_function_locked(struct pci_dev *dev); > int pci_reset_function(struct pci_dev *dev); > > -- > To unsubscribe from this list: send the line "unsubscribe linux-pci" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index b901ee7..6d6cf89 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -4729,6 +4729,25 @@ int pcie_set_mps(struct pci_dev *dev, int mps) } EXPORT_SYMBOL(pcie_set_mps); +int pcie_get_link(struct pci_dev *dev, enum pci_bus_speed *speed, + enum pcie_link_width *width) +{ + int ret; + u16 lnksta; + + ret = pcie_capability_read_word(dev, PCI_EXP_LNKSTA, &lnksta); + if (ret) + return ret; + + if (speed) + *speed = pcie_link_speed[lnksta & PCI_EXP_LNKSTA_CLS]; + if (width) + *width = (lnksta & PCI_EXP_LNKSTA_NLW) >> + PCI_EXP_LNKSTA_NLW_SHIFT; + + return 0; +} + /** * pcie_get_minimum_link - determine minimum link settings of a PCI device * @dev: PCI device to query @@ -4747,18 +4766,13 @@ int pcie_get_minimum_link(struct pci_dev *dev, enum pci_bus_speed *speed, *width = PCIE_LNK_WIDTH_UNKNOWN; while (dev) { - u16 lnksta; enum pci_bus_speed next_speed; enum pcie_link_width next_width; - ret = pcie_capability_read_word(dev, PCI_EXP_LNKSTA, &lnksta); + ret = pcie_get_link(dev, &next_speed, &next_width); if (ret) return ret; - next_speed = pcie_link_speed[lnksta & PCI_EXP_LNKSTA_CLS]; - next_width = (lnksta & PCI_EXP_LNKSTA_NLW) >> - PCI_EXP_LNKSTA_NLW_SHIFT; - if (next_speed < *speed) *speed = next_speed; diff --git a/include/linux/pci.h b/include/linux/pci.h index c3248d5..fbfbb40 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1026,6 +1026,8 @@ static inline int pci_is_managed(struct pci_dev *pdev) int pcie_set_mps(struct pci_dev *dev, int mps); int pcie_get_minimum_link(struct pci_dev *dev, enum pci_bus_speed *speed, enum pcie_link_width *width); +int pcie_get_link(struct pci_dev *dev, enum pci_bus_speed *speed, + enum pcie_link_width *width); int __pci_reset_function(struct pci_dev *dev); int __pci_reset_function_locked(struct pci_dev *dev); int pci_reset_function(struct pci_dev *dev);
Signed-off-by: Alex Williamson <alex.williamson@redhat.com> --- drivers/pci/pci.c | 26 ++++++++++++++++++++------ include/linux/pci.h | 2 ++ 2 files changed, 22 insertions(+), 6 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html