[PATCH V9 8/8] PCI/IOV: Enable 10-Bit Tag support for PCIe VF devices
From: Dongdong Liu <hidden>
Date: 2021-09-22 13:40:27
Also in:
linux-pci, netdev
Subsystem:
pci subsystem, the rest · Maintainers:
Bjorn Helgaas, Linus Torvalds
Enable 10-Bit Tag Requester for the VF devices below the Root Port that support 10-Bit Tag Completer. Signed-off-by: Dongdong Liu <redacted> --- drivers/pci/iov.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index 4fd1fca69457..28dd6875e2cb 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c@@ -690,6 +690,15 @@ 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);
@@ -706,6 +715,7 @@ 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);
@@ -738,6 +748,7 @@ 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);
--
2.22.0