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powerpc/powernv/pci: Add helper to check if a PE has a single vendor

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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>
This commit is contained in:
Russell Currey 2017-06-21 17:18:03 +10:00 committed by Michael Ellerman
parent a4b48ba904
commit a0f98629f1
1 changed files with 25 additions and 0 deletions
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25
arch/powerpc/platforms/powernv/pci-ioda.c
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@ -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);