Add a helper that determines if all the devices contained in a given PE are all from the same vendor or not. This can be useful in determining if it's okay to make PE-wide changes that may be suitable for some devices but not for others.
This is used later in the series. Signed-off-by: Russell Currey <rus...@russell.cc> --- arch/powerpc/platforms/powernv/pci-ioda.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c index 283caf1070c9..13835ac30795 100644 --- a/arch/powerpc/platforms/powernv/pci-ioda.c +++ b/arch/powerpc/platforms/powernv/pci-ioda.c @@ -1718,6 +1718,31 @@ static void pnv_pci_ioda_dma_dev_setup(struct pnv_phb *phb, struct pci_dev *pdev */ } +static bool pnv_pci_ioda_pe_single_vendor(struct pnv_ioda_pe *pe) +{ + unsigned short vendor = 0; + struct pci_dev *pdev; + + if (pe->device_count == 1) + return true; + + /* pe->pdev should be set if it's a single device, pe->pbus if not */ + if (!pe->pbus) + return true; + + list_for_each_entry(pdev, &pe->pbus->devices, bus_list) { + if (!vendor) { + vendor = pdev->vendor; + continue; + } + + if (pdev->vendor != vendor) + return false; + } + + return true; +} + static int pnv_pci_ioda_dma_set_mask(struct pci_dev *pdev, u64 dma_mask) { struct pci_controller *hose = pci_bus_to_host(pdev->bus); -- 2.13.1