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authorGavin Shan <gwshan@linux.vnet.ibm.com>2017-08-11 11:19:33 +0300
committerBjorn Helgaas <bhelgaas@google.com>2017-08-30 01:24:02 +0300
commit0fc690a7c3f7053613dcbab6a7613bb6586d8ee2 (patch)
tree6feba454ea92df74db6a46c1a6cbad340622e6ce /drivers/pci/iov.c
parenta0418aa262dfbe4011df85c8d40993bf21d53cd2 (diff)
downloadlinux-0fc690a7c3f7053613dcbab6a7613bb6586d8ee2.tar.xz
PCI: Disable VF decoding before pcibios_sriov_disable() updates resources
A struct resource represents the address space consumed by a device. We should not modify that resource while the device is actively using the address space. For VFs, pci_iov_update_resource() enforces this by printing a warning and doing nothing if the VFE (VF Enable) and MSE (VF Memory Space Enable) bits are set. Previously, both sriov_enable() and sriov_disable() called the pcibios_sriov_disable() arch hook, which may update the struct resource, while VFE and MSE were enabled. This effectively dropped the resource update pcibios_sriov_disable() intended to do. Disable VF memory decoding before calling pcibios_sriov_disable(). Reported-by: Carol L Soto <clsoto@us.ibm.com> Tested-by: Carol L Soto <clsoto@us.ibm.com> Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> [bhelgaas: changelog] Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Cc: shan.gavin@gmail.com Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'drivers/pci/iov.c')
-rw-r--r--drivers/pci/iov.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index 120485d6f352..ac41c8be9200 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -331,7 +331,6 @@ failed:
while (i--)
pci_iov_remove_virtfn(dev, i, 0);
- pcibios_sriov_disable(dev);
err_pcibios:
iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
pci_cfg_access_lock(dev);
@@ -339,6 +338,8 @@ err_pcibios:
ssleep(1);
pci_cfg_access_unlock(dev);
+ pcibios_sriov_disable(dev);
+
if (iov->link != dev->devfn)
sysfs_remove_link(&dev->dev.kobj, "dep_link");
@@ -357,14 +358,14 @@ static void sriov_disable(struct pci_dev *dev)
for (i = 0; i < iov->num_VFs; i++)
pci_iov_remove_virtfn(dev, i, 0);
- pcibios_sriov_disable(dev);
-
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);
ssleep(1);
pci_cfg_access_unlock(dev);
+ pcibios_sriov_disable(dev);
+
if (iov->link != dev->devfn)
sysfs_remove_link(&dev->dev.kobj, "dep_link");