From 995df527f3990d91fe8f3d7d1917a7adc3938320 Mon Sep 17 00:00:00 2001 From: Wei Yang Date: Wed, 25 Mar 2015 16:23:49 +0800 Subject: [PATCH] PCI: Add pcibios_sriov_enable() and pcibios_sriov_disable() 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 Acked-by: Bjorn Helgaas Signed-off-by: Benjamin Herrenschmidt --- drivers/pci/iov.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index 5643a1011e23..64c46925c62d 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 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn) 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);