From: Sebastian Ott <sebott@linux.ibm.com>
Date: Fri, 21 Dec 2018 15:14:19 +0100
Subject: PCI/IOV: Add flag so platforms can skip VF scanning
Git-commit: aff68a5a621e2569d126b817d0d42f658df524bf
Patch-mainline: v5.0-rc1
References: jsc#SLE-5803 FATE#327056
Provide a flag to skip scanning for new VFs after SR-IOV enablement. This
can be set by implementations for which the VFs are already reported by
other means.
Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/pci/iov.c | 6 ++++++
include/linux/pci.h | 1 +
2 files changed, 7 insertions(+)
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -229,6 +229,9 @@ static int sriov_add_vfs(struct pci_dev
unsigned int i;
int rc;
+ if (dev->no_vf_scan)
+ return 0;
+
for (i = 0; i < num_vfs; i++) {
rc = pci_iov_add_virtfn(dev, i);
if (rc)
@@ -357,6 +360,9 @@ static void sriov_del_vfs(struct pci_dev
struct pci_sriov *iov = dev->sriov;
int i;
+ if (dev->no_vf_scan)
+ return;
+
for (i = 0; i < iov->num_VFs; i++)
pci_iov_remove_virtfn(dev, i);
}
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -404,6 +404,7 @@ struct pci_dev {
unsigned int irq_managed:1;
unsigned int has_secondary_link:1;
unsigned int non_compliant_bars:1; /* broken BARs; ignore them */
+ unsigned int no_vf_scan:1; /* Don't scan for VFs after IOV enablement */
pci_dev_flags_t dev_flags;
atomic_t enable_cnt; /* pci_enable_device has been called */