[PATCH V16 08/20] PCI: Add pcibios_sriov_enable() and pcibios_sriov_disable()
From: Wei Yang <hidden>
Date: 2015-03-25 08:27:54
Also in:
linux-pci
Subsystem:
pci subsystem, the rest · Maintainers:
Bjorn Helgaas, Linus Torvalds
VFs are dynamically created when a driver enables them. On some platforms, like PowerNV, special resources are necessary to enable VFs. Add platform hooks for enabling and disabling VFs. Signed-off-by: Wei Yang <redacted> Acked-by: Bjorn Helgaas <bhelgaas@google.com> --- drivers/pci/iov.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index 5643a10..64c4692 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c@@ -220,6 +220,11 @@ static void virtfn_remove(struct pci_dev *dev, int id, int reset) pci_dev_put(dev); } +int __weak pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs) +{ + return 0; +} + static int sriov_enable(struct pci_dev *dev, int nr_virtfn) { int rc;
@@ -231,6 +236,7 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn) struct pci_sriov *iov = dev->sriov; int bars = 0; int bus; + int retval; if (!nr_virtfn) return 0;
@@ -307,6 +313,12 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn) if (nr_virtfn < initial) initial = nr_virtfn; + if ((retval = pcibios_sriov_enable(dev, initial))) { + dev_err(&dev->dev, "failure %d from pcibios_sriov_enable()\n", + retval); + return retval; + } + for (i = 0; i < initial; i++) { rc = virtfn_add(dev, i, 0); if (rc)
@@ -335,6 +347,11 @@ failed: return rc; } +int __weak pcibios_sriov_disable(struct pci_dev *pdev) +{ + return 0; +} + static void sriov_disable(struct pci_dev *dev) { int i;
@@ -346,6 +363,8 @@ static void sriov_disable(struct pci_dev *dev) for (i = 0; i < iov->num_VFs; i++) virtfn_remove(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);
--
1.7.9.5