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.
-Varun > -----Original Message----- > From: Alex Williamson [mailto:alex.william...@redhat.com] > Sent: Monday, May 13, 2013 8:19 PM > To: Sethi Varun-B16395 > Cc: bhelg...@google.com; step...@networkplumber.org; linux- > p...@vger.kernel.org; iommu@lists.linux-foundation.org; > dw...@infradead.org > 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-boun...@lists.linux-foundation.org [mailto:iommu- > > > boun...@lists.linux-foundation.org] On Behalf Of Alex Williamson > > > Sent: Saturday, May 11, 2013 2:49 AM > > > To: bhelg...@google.com; step...@networkplumber.org > > > Cc: linux-...@vger.kernel.org; iommu@lists.linux-foundation.org; > > > dw...@infradead.org > > > 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.william...@redhat.com> > > > --- > > > 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@lists.linux-foundation.org > > > https://lists.linuxfoundation.org/mailman/listinfo/iommu > > > > > > > _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
