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[v4,7/7] PCI: Skip Enhanced Allocation (EA) initialization for VF device

Message ID defa049210d43fa42bdb1cec93495e4038f00d88.1562172836.git.sathyanarayanan.kuppuswamy@linux.intel.com
State Superseded
Delegated to: Bjorn Helgaas
Headers show
Series Fix PF/VF dependency issue | expand

Commit Message

Kuppuswamy Sathyanarayanan July 3, 2019, 8:46 p.m. UTC 
From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>

As per PCIe r4.0, sec 9.3.6, VF must not implement Enhanced Allocation
Capability. So skip pci_ea_init() for virtual devices.

Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Keith Busch <keith.busch@intel.com>
Suggested-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
 drivers/pci/pci.c | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 8abc843b1615..c299ab470351 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -2986,6 +2986,13 @@  void pci_ea_init(struct pci_dev *dev)
 	int offset;
 	int i;
 
+	/*
+	 * Per PCIe r4.0, sec 9.3.6, VF must not implement Enhanced
+	 * Allocation Capability.
+	 */
+	if (dev->is_virtfn)
+		return;
+
 	/* find PCI EA capability in list */
 	ea = pci_find_capability(dev, PCI_CAP_ID_EA);
 	if (!ea)