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Commit a0f98629 authored by Russell Currey's avatar Russell Currey Committed by Michael Ellerman
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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: default avatarRussell Currey <ruscur@russell.cc>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent a4b48ba9

arch/powerpc/platforms/powernv/pci-ioda.c

+25 −0
Original line number Diff line number Diff line
@@ -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);