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authorRam Pai <linuxram@us.ibm.com>2011-11-06 02:33:57 (GMT)
committerJesse Barnes <jbarnes@virtuousgeek.org>2012-01-06 20:10:49 (GMT)
commitafd24ece5c76af87f6fc477f2747b83a764f161c (patch)
treede109314a682a9ed78a61c4838663b9645f7b0c5 /drivers/pci
parent79cc9601c3e42b4f0650fe7e69132ebce7ab48f9 (diff)
downloadlinux-afd24ece5c76af87f6fc477f2747b83a764f161c.tar.xz
PCI: delay configuration of SRIOV capability
The SRIOV capability, namely page size and total_vfs of a device are configured during enumeration phase of the device. This can potentially interfere with the PCI operations of the platform, if the IOV capability of the device is not enabled. The following patch postpones the configuration of the IOV capability of the device to a later point, when the IOV capability is explicitly enabled by the device driver. The patch is tested on x86 and power platform. Tested-by: Donald Dutile <ddutile@redhat.com> Signed-off-by: Ram Pai <linuxram@us.ibm.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/iov.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index 6a4d703..0321fa3 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -347,6 +347,8 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
return rc;
}
+ pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz);
+
iov->ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE;
pci_cfg_access_lock(dev);
pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
@@ -452,7 +454,6 @@ static int sriov_init(struct pci_dev *dev, int pos)
found:
pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, ctrl);
- pci_write_config_word(dev, pos + PCI_SRIOV_NUM_VF, total);
pci_read_config_word(dev, pos + PCI_SRIOV_VF_OFFSET, &offset);
pci_read_config_word(dev, pos + PCI_SRIOV_VF_STRIDE, &stride);
if (!offset || (total > 1 && !stride))
@@ -465,7 +466,6 @@ found:
return -EIO;
pgsz &= ~(pgsz - 1);
- pci_write_config_dword(dev, pos + PCI_SRIOV_SYS_PGSIZE, pgsz);
nres = 0;
for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {