diff mbox series

[V11,8/8] PCI/IOV: Enable 10-Bit Tag support for PCIe VF devices

Message ID 20211030135348.61364-9-liudongdong3@huawei.com (mailing list archive)
State Not Applicable
Delegated to: Bjorn Helgaas
Headers show
Series PCI: Enable 10-Bit tag support for PCIe devices | expand

Commit Message

Dongdong Liu Oct. 30, 2021, 1:53 p.m. UTC 
Enable 10-Bit Tag Requester for the VF devices below the
Root Port that support 10-Bit Tag Completer.

Signed-off-by: Dongdong Liu <liudongdong3@huawei.com>
---
 drivers/pci/iov.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
diff mbox series

Patch

diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index 0f8203ccc701..4dd50996204e 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -707,6 +707,15 @@  static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
 
 	pci_iov_set_numvfs(dev, nr_virtfn);
 	iov->ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE;
+
+	if ((pcie_tag_config == PCIE_TAG_DEFAULT) &&
+	    (iov->cap & PCI_SRIOV_CAP_VF_10BIT_TAG_REQ) &&
+	    pcie_rp_10bit_tag_cmp_supported(dev))
+		iov->ctrl |= PCI_SRIOV_CTRL_VF_10BIT_TAG_REQ_EN;
+
+	if (pcie_tag_config == PCIE_TAG_PEER2PEER)
+		iov->ctrl &= ~PCI_SRIOV_CTRL_VF_10BIT_TAG_REQ_EN;
+
 	pci_cfg_access_lock(dev);
 	pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
 	msleep(100);
@@ -723,6 +732,7 @@  static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
 
 err_pcibios:
 	iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
+	iov->ctrl &= ~PCI_SRIOV_CTRL_VF_10BIT_TAG_REQ_EN;
 	pci_cfg_access_lock(dev);
 	pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
 	ssleep(1);
@@ -755,6 +765,7 @@  static void sriov_disable(struct pci_dev *dev)
 
 	sriov_del_vfs(dev);
 	iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
+	iov->ctrl &= ~PCI_SRIOV_CTRL_VF_10BIT_TAG_REQ_EN;
 	pci_cfg_access_lock(dev);
 	pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
 	ssleep(1);