From: Russell Currey <ruscur@russell.cc>
To: linuxppc-dev@lists.ozlabs.org
Cc: alistair@popple.id.au, benh@kernel.crashing.org,
Russell Currey <ruscur@russell.cc>
Subject: [PATCH 1/2] powerpc/powernv/pci: Add helper to check if a PE has a single vendor
Date: Wed, 21 Jun 2017 17:18:03 +1000 [thread overview]
Message-ID: <20170621071804.11660-1-ruscur@russell.cc> (raw)
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>
---
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
next reply other threads:[~2017-06-21 7:25 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-21 7:18 Russell Currey [this message]
2017-06-21 7:18 ` [PATCH 2/2] powerpc/powernv/pci: Enable 64-bit devices to access >4GB DMA space Russell Currey
2017-06-23 16:15 ` [PATCH 1/2] powerpc/powernv/pci: Add helper to check if a PE has a single vendor kbuild test robot
2017-06-26 4:48 ` Alistair Popple
2017-06-29 12:21 ` [1/2] " Michael Ellerman
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