Re: [PATCH v7 7/7] PCI: Skip Enhanced Allocation (EA) initialization for VF device

From: Kuppuswamy Sathyanarayanan
Date: Thu Oct 03 2019 - 13:26:51 EST


Hi Bjorn,

On 8/28/19 3:14 PM, sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx wrote:
From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>

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@xxxxxxxxx>
Cc: Keith Busch <keith.busch@xxxxxxxxx>
Suggested-by: Ashok Raj <ashok.raj@xxxxxxxxx>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
This patch was also dropped in your v8. Is this also intentional?
---
drivers/pci/pci.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 1b27b5af3d55..266600a11769 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -3025,6 +3025,13 @@ 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)

--
Sathyanarayanan Kuppuswamy
Linux kernel developer