On Wed, 2013-05-22 at 14:34 +0000, Sethi Varun-B16395 wrote: > Any idea when would this patch set be integrated? Freescale PAMU > driver depends on this patch. Currently I am using the > pci_find_pcie_upstream_bridge routine in the device group creation > routine. I don't know, Bjorn? The bugzilla referenced in patch 0/3 has several reports from users that this series solves the problem for them. Thanks, Alex > > -----Original Message----- > > From: Alex Williamson [mailto:alex.williamson@xxxxxxxxxx] > > Sent: Monday, May 13, 2013 8:19 PM > > To: Sethi Varun-B16395 > > Cc: bhelgaas@xxxxxxxxxx; stephen@xxxxxxxxxxxxxxxxxx; linux- > > pci@xxxxxxxxxxxxxxx; iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx; > > dwmw2@xxxxxxxxxxxxx > > Subject: Re: [PATCH 1/3] pci: Add PCI walk function and PCIe bridge test > > > > On Mon, 2013-05-13 at 13:51 +0000, Sethi Varun-B16395 wrote: > > > Would these functions be used outside drivers/iommu? We recently added > > pci.h under drivers/iommu, maybe we can add a new file for these > > functions as well. > > > > The intention is to make them generic enough for pci-core, unlike > > pci_find_upstream_pcie_bridge, which was rather specific to iommu usage. > > Thanks, > > > > Alex > > > > > > -----Original Message----- > > > > From: iommu-bounces@xxxxxxxxxxxxxxxxxxxxxxxxxx [mailto:iommu- > > > > bounces@xxxxxxxxxxxxxxxxxxxxxxxxxx] On Behalf Of Alex Williamson > > > > Sent: Saturday, May 11, 2013 2:49 AM > > > > To: bhelgaas@xxxxxxxxxx; stephen@xxxxxxxxxxxxxxxxxx > > > > Cc: linux-pci@xxxxxxxxxxxxxxx; iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx; > > > > dwmw2@xxxxxxxxxxxxx > > > > Subject: [PATCH 1/3] pci: Add PCI walk function and PCIe bridge test > > > > > > > > These will replace pci_find_upstream_pcie_bridge, which is difficult > > > > to use and rather specific to intel-iommu usage. A quirked > > > > pci_is_pcie_bridge function is provided to work around non-compliant > > > > PCIe-to-PCI bridges such as those found in > > > > https://bugzilla.kernel.org/show_bug.cgi?id=44881 > > > > > > > > Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx> > > > > --- > > > > drivers/pci/search.c | 57 > > > > ++++++++++++++++++++++++++++++++++++++++++++++++++ > > > > include/linux/pci.h | 23 ++++++++++++++++++++ > > > > 2 files changed, 80 insertions(+) > > > > > > > > diff --git a/drivers/pci/search.c b/drivers/pci/search.c index > > > > d0627fa..0357f74 100644 > > > > --- a/drivers/pci/search.c > > > > +++ b/drivers/pci/search.c > > > > @@ -17,6 +17,63 @@ > > > > DECLARE_RWSEM(pci_bus_sem); > > > > EXPORT_SYMBOL_GPL(pci_bus_sem); > > > > > > > > +/* Test for PCIe bridges. */ > > > > +bool pci_is_pcie_bridge(struct pci_dev *pdev) { > > > > + if (!pci_is_bridge(pdev)) > > > > + return false; > > > > + > > > > + if (pci_is_pcie(pdev)) > > > > + return true; > > > > + > > > > +#ifdef CONFIG_PCI_QUIRKS > > > > + /* > > > > + * If we're not on the root bus, look one device upstream of the > > > > + * current device. If that device is PCIe and is not a PCIe-to-PCI > > > > + * bridge, then the current device is effectively PCIe as it must > > > > + * be the PCIe-to-PCI bridge. This handles several bridges that > > > > + * violate the PCIe spec by not exposing a PCIe capability: > > > > + * https://bugzilla.kernel.org/show_bug.cgi?id=44881 > > > > + */ > > > > + if (!pci_is_root_bus(pdev->bus)) { > > > > + struct pci_dev *parent = pdev->bus->self; > > > > + > > > > + if (pci_is_pcie(parent) && > > > > + pci_pcie_type(parent) != PCI_EXP_TYPE_PCI_BRIDGE) > > > > + > > > > + return true; > > > > + } > > > > +#endif > > > > + return false; > > > > +} > > > > + > > > > +/* > > > > + * Walk upstream from the given pdev for the first device returning > > > > + * true for the provided match function. If no match is found, > > > > +return > > > > + * NULL. *last records the previous step in the walk. > > > > + */ > > > > +struct pci_dev *pci_walk_up_to_first_match(struct pci_dev *pdev, > > > > + bool (*match)(struct pci_dev *), > > > > + struct pci_dev **last) > > > > +{ > > > > + *last = NULL; > > > > + > > > > + if (match(pdev)) > > > > + return pdev; > > > > + > > > > + *last = pdev; > > > > + > > > > + while (!pci_is_root_bus(pdev->bus)) { > > > > + *last = pdev; > > > > + pdev = pdev->bus->self; > > > > + > > > > + if (match(pdev)) > > > > + return pdev; > > > > + } > > > > + > > > > + return NULL; > > > > +} > > > > + > > > > /* > > > > * find the upstream PCIe-to-PCI bridge of a PCI device > > > > * if the device is PCIE, return NULL diff --git > > > > a/include/linux/pci.h b/include/linux/pci.h index bd8ec30..e87423a > > > > 100644 > > > > --- a/include/linux/pci.h > > > > +++ b/include/linux/pci.h > > > > @@ -1855,6 +1855,29 @@ static inline struct eeh_dev > > > > *pci_dev_to_eeh_dev(struct pci_dev *pdev) #endif > > > > > > > > /** > > > > + * pci_walk_up_to_first_match - Generic upstream search function > > > > + * @pdev: starting PCI device to search > > > > + * @match: match function to call on each device (true = match) > > > > + * @last: last device examined prior to returned device > > > > + * > > > > + * Walk upstream from the given device, calling match() at each > > device. > > > > + * Returns the first device matching match(). If the root bus is > > > > +reached > > > > + * without finding a match, return NULL. last returns the N-1 step > > > > +in > > > > + * the search path. > > > > + */ > > > > +struct pci_dev *pci_walk_up_to_first_match(struct pci_dev *pdev, > > > > + bool (*match)(struct pci_dev *), > > > > + struct pci_dev **last); > > > > + > > > > +/** > > > > + * pci_is_pcie_bridge - Match a PCIe bridge device > > > > + * @pdev: device to test > > > > + * > > > > + * Return true if the given device is a PCIe bridge, false > > otherwise. > > > > + */ > > > > +bool pci_is_pcie_bridge(struct pci_dev *pdev); > > > > + > > > > +/** > > > > * pci_find_upstream_pcie_bridge - find upstream PCIe-to-PCI bridge > > > > of a device > > > > * @pdev: the PCI device > > > > * > > > > > > > > _______________________________________________ > > > > iommu mailing list > > > > iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx > > > > https://lists.linuxfoundation.org/mailman/listinfo/iommu > > > > > > > > > > > > > -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
