powerpc/powernv/pci: Add helper to check if a PE has a single vendor
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 <ruscur@russell.cc>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 96d0156..a642412 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -1718,6 +1718,31 @@
*/
}
+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);