linux-kernel - [PATCH v3 7/7] PCI: Skip Enhanced Allocation (EA) initialization for VF device

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Date:   Thu, 20 Jun 2019 13:38:48 -0700
From:   sathyanarayanan.kuppuswamy@...ux.intel.com
To:     bhelgaas@...gle.com
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        ashok.raj@...el.com, keith.busch@...el.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com
Subject: [PATCH v3 7/7] PCI: Skip Enhanced Allocation (EA) initialization for VF device

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

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)
-- 
2.21.0