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![Leon Romanovsky](/assets/img/avatar_default.png)
A typical cloud provider SR-IOV use case is to create many VFs for use by guest VMs. The VFs may not be assigned to a VM until a customer requests a VM of a certain size, e.g., number of CPUs. A VF may need MSI-X vectors proportional to the number of CPUs in the VM, but there is no standard way to change the number of MSI-X vectors supported by a VF. Some Mellanox ConnectX devices support dynamic assignment of MSI-X vectors to SR-IOV VFs. This can be done by the PF driver after VFs are enabled, and it can be done without affecting VFs that are already in use. The hardware supports a limited pool of MSI-X vectors that can be assigned to the PF or to individual VFs. This is device-specific behavior that requires support in the PF driver. Add a read-only "sriov_vf_total_msix" sysfs file for the PF and a writable "sriov_vf_msix_count" file for each VF. Management software may use these to learn how many MSI-X vectors are available and to dynamically assign them to VFs before the VFs are passed through to a VM. If the PF driver implements the ->sriov_get_vf_total_msix() callback, "sriov_vf_total_msix" contains the total number of MSI-X vectors available for distribution among VFs. If no driver is bound to the VF, writing "N" to "sriov_vf_msix_count" uses the PF driver ->sriov_set_msix_vec_count() callback to assign "N" MSI-X vectors to the VF. When a VF driver subsequently reads the MSI-X Message Control register, it will see the new Table Size "N". Link: https://lore.kernel.org/linux-pci/20210314124256.70253-2-leon@kernel.org Acked-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
1181 lines
27 KiB
C
1181 lines
27 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* PCI Express I/O Virtualization (IOV) support
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* Single Root IOV 1.0
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* Address Translation Service 1.0
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*
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* Copyright (C) 2009 Intel Corporation, Yu Zhao <yu.zhao@intel.com>
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*/
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <linux/string.h>
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#include <linux/delay.h>
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#include "pci.h"
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#define VIRTFN_ID_LEN 16
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int pci_iov_virtfn_bus(struct pci_dev *dev, int vf_id)
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{
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if (!dev->is_physfn)
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return -EINVAL;
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return dev->bus->number + ((dev->devfn + dev->sriov->offset +
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dev->sriov->stride * vf_id) >> 8);
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}
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int pci_iov_virtfn_devfn(struct pci_dev *dev, int vf_id)
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{
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if (!dev->is_physfn)
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return -EINVAL;
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return (dev->devfn + dev->sriov->offset +
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dev->sriov->stride * vf_id) & 0xff;
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}
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EXPORT_SYMBOL_GPL(pci_iov_virtfn_devfn);
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/*
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* Per SR-IOV spec sec 3.3.10 and 3.3.11, First VF Offset and VF Stride may
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* change when NumVFs changes.
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*
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* Update iov->offset and iov->stride when NumVFs is written.
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*/
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static inline void pci_iov_set_numvfs(struct pci_dev *dev, int nr_virtfn)
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{
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struct pci_sriov *iov = dev->sriov;
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pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, nr_virtfn);
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pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_OFFSET, &iov->offset);
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pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_STRIDE, &iov->stride);
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}
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/*
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* The PF consumes one bus number. NumVFs, First VF Offset, and VF Stride
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* determine how many additional bus numbers will be consumed by VFs.
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*
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* Iterate over all valid NumVFs, validate offset and stride, and calculate
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* the maximum number of bus numbers that could ever be required.
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*/
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static int compute_max_vf_buses(struct pci_dev *dev)
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{
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struct pci_sriov *iov = dev->sriov;
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int nr_virtfn, busnr, rc = 0;
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for (nr_virtfn = iov->total_VFs; nr_virtfn; nr_virtfn--) {
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pci_iov_set_numvfs(dev, nr_virtfn);
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if (!iov->offset || (nr_virtfn > 1 && !iov->stride)) {
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rc = -EIO;
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goto out;
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}
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busnr = pci_iov_virtfn_bus(dev, nr_virtfn - 1);
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if (busnr > iov->max_VF_buses)
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iov->max_VF_buses = busnr;
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}
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out:
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pci_iov_set_numvfs(dev, 0);
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return rc;
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}
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static struct pci_bus *virtfn_add_bus(struct pci_bus *bus, int busnr)
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{
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struct pci_bus *child;
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if (bus->number == busnr)
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return bus;
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child = pci_find_bus(pci_domain_nr(bus), busnr);
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if (child)
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return child;
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child = pci_add_new_bus(bus, NULL, busnr);
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if (!child)
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return NULL;
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pci_bus_insert_busn_res(child, busnr, busnr);
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return child;
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}
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static void virtfn_remove_bus(struct pci_bus *physbus, struct pci_bus *virtbus)
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{
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if (physbus != virtbus && list_empty(&virtbus->devices))
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pci_remove_bus(virtbus);
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}
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resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno)
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{
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if (!dev->is_physfn)
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return 0;
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return dev->sriov->barsz[resno - PCI_IOV_RESOURCES];
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}
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static void pci_read_vf_config_common(struct pci_dev *virtfn)
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{
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struct pci_dev *physfn = virtfn->physfn;
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/*
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* Some config registers are the same across all associated VFs.
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* Read them once from VF0 so we can skip reading them from the
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* other VFs.
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*
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* PCIe r4.0, sec 9.3.4.1, technically doesn't require all VFs to
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* have the same Revision ID and Subsystem ID, but we assume they
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* do.
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*/
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pci_read_config_dword(virtfn, PCI_CLASS_REVISION,
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&physfn->sriov->class);
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pci_read_config_byte(virtfn, PCI_HEADER_TYPE,
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&physfn->sriov->hdr_type);
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pci_read_config_word(virtfn, PCI_SUBSYSTEM_VENDOR_ID,
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&physfn->sriov->subsystem_vendor);
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pci_read_config_word(virtfn, PCI_SUBSYSTEM_ID,
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&physfn->sriov->subsystem_device);
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}
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int pci_iov_sysfs_link(struct pci_dev *dev,
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struct pci_dev *virtfn, int id)
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{
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char buf[VIRTFN_ID_LEN];
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int rc;
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sprintf(buf, "virtfn%u", id);
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rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf);
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if (rc)
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goto failed;
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rc = sysfs_create_link(&virtfn->dev.kobj, &dev->dev.kobj, "physfn");
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if (rc)
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goto failed1;
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kobject_uevent(&virtfn->dev.kobj, KOBJ_CHANGE);
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return 0;
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failed1:
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sysfs_remove_link(&dev->dev.kobj, buf);
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failed:
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return rc;
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}
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#ifdef CONFIG_PCI_MSI
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static ssize_t sriov_vf_total_msix_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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u32 vf_total_msix = 0;
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device_lock(dev);
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if (!pdev->driver || !pdev->driver->sriov_get_vf_total_msix)
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goto unlock;
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vf_total_msix = pdev->driver->sriov_get_vf_total_msix(pdev);
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unlock:
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device_unlock(dev);
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return sysfs_emit(buf, "%u\n", vf_total_msix);
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}
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static DEVICE_ATTR_RO(sriov_vf_total_msix);
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static ssize_t sriov_vf_msix_count_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct pci_dev *vf_dev = to_pci_dev(dev);
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struct pci_dev *pdev = pci_physfn(vf_dev);
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int val, ret;
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ret = kstrtoint(buf, 0, &val);
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if (ret)
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return ret;
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if (val < 0)
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return -EINVAL;
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device_lock(&pdev->dev);
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if (!pdev->driver || !pdev->driver->sriov_set_msix_vec_count) {
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ret = -EOPNOTSUPP;
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goto err_pdev;
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}
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device_lock(&vf_dev->dev);
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if (vf_dev->driver) {
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/*
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* A driver is already attached to this VF and has configured
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* itself based on the current MSI-X vector count. Changing
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* the vector size could mess up the driver, so block it.
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*/
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ret = -EBUSY;
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goto err_dev;
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}
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ret = pdev->driver->sriov_set_msix_vec_count(vf_dev, val);
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err_dev:
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device_unlock(&vf_dev->dev);
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err_pdev:
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device_unlock(&pdev->dev);
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return ret ? : count;
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}
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static DEVICE_ATTR_WO(sriov_vf_msix_count);
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#endif
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static struct attribute *sriov_vf_dev_attrs[] = {
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#ifdef CONFIG_PCI_MSI
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&dev_attr_sriov_vf_msix_count.attr,
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#endif
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NULL,
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};
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static umode_t sriov_vf_attrs_are_visible(struct kobject *kobj,
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struct attribute *a, int n)
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{
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struct device *dev = kobj_to_dev(kobj);
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struct pci_dev *pdev = to_pci_dev(dev);
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if (!pdev->is_virtfn)
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return 0;
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return a->mode;
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}
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const struct attribute_group sriov_vf_dev_attr_group = {
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.attrs = sriov_vf_dev_attrs,
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.is_visible = sriov_vf_attrs_are_visible,
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};
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int pci_iov_add_virtfn(struct pci_dev *dev, int id)
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{
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int i;
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int rc = -ENOMEM;
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u64 size;
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struct pci_dev *virtfn;
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struct resource *res;
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struct pci_sriov *iov = dev->sriov;
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struct pci_bus *bus;
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bus = virtfn_add_bus(dev->bus, pci_iov_virtfn_bus(dev, id));
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if (!bus)
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goto failed;
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virtfn = pci_alloc_dev(bus);
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if (!virtfn)
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goto failed0;
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virtfn->devfn = pci_iov_virtfn_devfn(dev, id);
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virtfn->vendor = dev->vendor;
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virtfn->device = iov->vf_device;
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virtfn->is_virtfn = 1;
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virtfn->physfn = pci_dev_get(dev);
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virtfn->no_command_memory = 1;
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if (id == 0)
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pci_read_vf_config_common(virtfn);
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rc = pci_setup_device(virtfn);
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if (rc)
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goto failed1;
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virtfn->dev.parent = dev->dev.parent;
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virtfn->multifunction = 0;
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for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
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res = &dev->resource[i + PCI_IOV_RESOURCES];
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if (!res->parent)
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continue;
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virtfn->resource[i].name = pci_name(virtfn);
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virtfn->resource[i].flags = res->flags;
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size = pci_iov_resource_size(dev, i + PCI_IOV_RESOURCES);
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virtfn->resource[i].start = res->start + size * id;
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virtfn->resource[i].end = virtfn->resource[i].start + size - 1;
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rc = request_resource(res, &virtfn->resource[i]);
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BUG_ON(rc);
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}
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pci_device_add(virtfn, virtfn->bus);
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rc = pci_iov_sysfs_link(dev, virtfn, id);
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if (rc)
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goto failed1;
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pci_bus_add_device(virtfn);
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return 0;
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failed1:
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pci_stop_and_remove_bus_device(virtfn);
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pci_dev_put(dev);
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failed0:
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virtfn_remove_bus(dev->bus, bus);
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failed:
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return rc;
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}
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void pci_iov_remove_virtfn(struct pci_dev *dev, int id)
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{
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char buf[VIRTFN_ID_LEN];
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struct pci_dev *virtfn;
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virtfn = pci_get_domain_bus_and_slot(pci_domain_nr(dev->bus),
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pci_iov_virtfn_bus(dev, id),
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pci_iov_virtfn_devfn(dev, id));
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if (!virtfn)
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return;
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sprintf(buf, "virtfn%u", id);
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sysfs_remove_link(&dev->dev.kobj, buf);
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/*
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* pci_stop_dev() could have been called for this virtfn already,
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* so the directory for the virtfn may have been removed before.
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* Double check to avoid spurious sysfs warnings.
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*/
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if (virtfn->dev.kobj.sd)
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sysfs_remove_link(&virtfn->dev.kobj, "physfn");
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pci_stop_and_remove_bus_device(virtfn);
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virtfn_remove_bus(dev->bus, virtfn->bus);
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/* balance pci_get_domain_bus_and_slot() */
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pci_dev_put(virtfn);
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pci_dev_put(dev);
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}
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|
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static ssize_t sriov_totalvfs_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
|
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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|
|
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return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
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}
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static ssize_t sriov_numvfs_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
|
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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u16 num_vfs;
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/* Serialize vs sriov_numvfs_store() so readers see valid num_VFs */
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device_lock(&pdev->dev);
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num_vfs = pdev->sriov->num_VFs;
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device_unlock(&pdev->dev);
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return sprintf(buf, "%u\n", num_vfs);
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}
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/*
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* num_vfs > 0; number of VFs to enable
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* num_vfs = 0; disable all VFs
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*
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* Note: SRIOV spec does not allow partial VF
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* disable, so it's all or none.
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*/
|
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static ssize_t sriov_numvfs_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
|
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{
|
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struct pci_dev *pdev = to_pci_dev(dev);
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int ret;
|
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u16 num_vfs;
|
|
|
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ret = kstrtou16(buf, 0, &num_vfs);
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if (ret < 0)
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return ret;
|
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|
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if (num_vfs > pci_sriov_get_totalvfs(pdev))
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return -ERANGE;
|
|
|
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device_lock(&pdev->dev);
|
|
|
|
if (num_vfs == pdev->sriov->num_VFs)
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|
goto exit;
|
|
|
|
/* is PF driver loaded w/callback */
|
|
if (!pdev->driver || !pdev->driver->sriov_configure) {
|
|
pci_info(pdev, "Driver does not support SRIOV configuration via sysfs\n");
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ret = -ENOENT;
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|
goto exit;
|
|
}
|
|
|
|
if (num_vfs == 0) {
|
|
/* disable VFs */
|
|
ret = pdev->driver->sriov_configure(pdev, 0);
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|
goto exit;
|
|
}
|
|
|
|
/* enable VFs */
|
|
if (pdev->sriov->num_VFs) {
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|
pci_warn(pdev, "%d VFs already enabled. Disable before enabling %d VFs\n",
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pdev->sriov->num_VFs, num_vfs);
|
|
ret = -EBUSY;
|
|
goto exit;
|
|
}
|
|
|
|
ret = pdev->driver->sriov_configure(pdev, num_vfs);
|
|
if (ret < 0)
|
|
goto exit;
|
|
|
|
if (ret != num_vfs)
|
|
pci_warn(pdev, "%d VFs requested; only %d enabled\n",
|
|
num_vfs, ret);
|
|
|
|
exit:
|
|
device_unlock(&pdev->dev);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t sriov_offset_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
|
|
return sprintf(buf, "%u\n", pdev->sriov->offset);
|
|
}
|
|
|
|
static ssize_t sriov_stride_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
|
|
return sprintf(buf, "%u\n", pdev->sriov->stride);
|
|
}
|
|
|
|
static ssize_t sriov_vf_device_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
|
|
return sprintf(buf, "%x\n", pdev->sriov->vf_device);
|
|
}
|
|
|
|
static ssize_t sriov_drivers_autoprobe_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
|
|
return sprintf(buf, "%u\n", pdev->sriov->drivers_autoprobe);
|
|
}
|
|
|
|
static ssize_t sriov_drivers_autoprobe_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
bool drivers_autoprobe;
|
|
|
|
if (kstrtobool(buf, &drivers_autoprobe) < 0)
|
|
return -EINVAL;
|
|
|
|
pdev->sriov->drivers_autoprobe = drivers_autoprobe;
|
|
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR_RO(sriov_totalvfs);
|
|
static DEVICE_ATTR_RW(sriov_numvfs);
|
|
static DEVICE_ATTR_RO(sriov_offset);
|
|
static DEVICE_ATTR_RO(sriov_stride);
|
|
static DEVICE_ATTR_RO(sriov_vf_device);
|
|
static DEVICE_ATTR_RW(sriov_drivers_autoprobe);
|
|
|
|
static struct attribute *sriov_pf_dev_attrs[] = {
|
|
&dev_attr_sriov_totalvfs.attr,
|
|
&dev_attr_sriov_numvfs.attr,
|
|
&dev_attr_sriov_offset.attr,
|
|
&dev_attr_sriov_stride.attr,
|
|
&dev_attr_sriov_vf_device.attr,
|
|
&dev_attr_sriov_drivers_autoprobe.attr,
|
|
#ifdef CONFIG_PCI_MSI
|
|
&dev_attr_sriov_vf_total_msix.attr,
|
|
#endif
|
|
NULL,
|
|
};
|
|
|
|
static umode_t sriov_pf_attrs_are_visible(struct kobject *kobj,
|
|
struct attribute *a, int n)
|
|
{
|
|
struct device *dev = kobj_to_dev(kobj);
|
|
|
|
if (!dev_is_pf(dev))
|
|
return 0;
|
|
|
|
return a->mode;
|
|
}
|
|
|
|
const struct attribute_group sriov_pf_dev_attr_group = {
|
|
.attrs = sriov_pf_dev_attrs,
|
|
.is_visible = sriov_pf_attrs_are_visible,
|
|
};
|
|
|
|
int __weak pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int __weak pcibios_sriov_disable(struct pci_dev *pdev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int sriov_add_vfs(struct pci_dev *dev, u16 num_vfs)
|
|
{
|
|
unsigned int i;
|
|
int rc;
|
|
|
|
if (dev->no_vf_scan)
|
|
return 0;
|
|
|
|
for (i = 0; i < num_vfs; i++) {
|
|
rc = pci_iov_add_virtfn(dev, i);
|
|
if (rc)
|
|
goto failed;
|
|
}
|
|
return 0;
|
|
failed:
|
|
while (i--)
|
|
pci_iov_remove_virtfn(dev, i);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
|
|
{
|
|
int rc;
|
|
int i;
|
|
int nres;
|
|
u16 initial;
|
|
struct resource *res;
|
|
struct pci_dev *pdev;
|
|
struct pci_sriov *iov = dev->sriov;
|
|
int bars = 0;
|
|
int bus;
|
|
|
|
if (!nr_virtfn)
|
|
return 0;
|
|
|
|
if (iov->num_VFs)
|
|
return -EINVAL;
|
|
|
|
pci_read_config_word(dev, iov->pos + PCI_SRIOV_INITIAL_VF, &initial);
|
|
if (initial > iov->total_VFs ||
|
|
(!(iov->cap & PCI_SRIOV_CAP_VFM) && (initial != iov->total_VFs)))
|
|
return -EIO;
|
|
|
|
if (nr_virtfn < 0 || nr_virtfn > iov->total_VFs ||
|
|
(!(iov->cap & PCI_SRIOV_CAP_VFM) && (nr_virtfn > initial)))
|
|
return -EINVAL;
|
|
|
|
nres = 0;
|
|
for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
|
|
bars |= (1 << (i + PCI_IOV_RESOURCES));
|
|
res = &dev->resource[i + PCI_IOV_RESOURCES];
|
|
if (res->parent)
|
|
nres++;
|
|
}
|
|
if (nres != iov->nres) {
|
|
pci_err(dev, "not enough MMIO resources for SR-IOV\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
bus = pci_iov_virtfn_bus(dev, nr_virtfn - 1);
|
|
if (bus > dev->bus->busn_res.end) {
|
|
pci_err(dev, "can't enable %d VFs (bus %02x out of range of %pR)\n",
|
|
nr_virtfn, bus, &dev->bus->busn_res);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (pci_enable_resources(dev, bars)) {
|
|
pci_err(dev, "SR-IOV: IOV BARS not allocated\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (iov->link != dev->devfn) {
|
|
pdev = pci_get_slot(dev->bus, iov->link);
|
|
if (!pdev)
|
|
return -ENODEV;
|
|
|
|
if (!pdev->is_physfn) {
|
|
pci_dev_put(pdev);
|
|
return -ENOSYS;
|
|
}
|
|
|
|
rc = sysfs_create_link(&dev->dev.kobj,
|
|
&pdev->dev.kobj, "dep_link");
|
|
pci_dev_put(pdev);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
iov->initial_VFs = initial;
|
|
if (nr_virtfn < initial)
|
|
initial = nr_virtfn;
|
|
|
|
rc = pcibios_sriov_enable(dev, initial);
|
|
if (rc) {
|
|
pci_err(dev, "failure %d from pcibios_sriov_enable()\n", rc);
|
|
goto err_pcibios;
|
|
}
|
|
|
|
pci_iov_set_numvfs(dev, nr_virtfn);
|
|
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);
|
|
msleep(100);
|
|
pci_cfg_access_unlock(dev);
|
|
|
|
rc = sriov_add_vfs(dev, initial);
|
|
if (rc)
|
|
goto err_pcibios;
|
|
|
|
kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE);
|
|
iov->num_VFs = nr_virtfn;
|
|
|
|
return 0;
|
|
|
|
err_pcibios:
|
|
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");
|
|
|
|
pci_iov_set_numvfs(dev, 0);
|
|
return rc;
|
|
}
|
|
|
|
static void sriov_del_vfs(struct pci_dev *dev)
|
|
{
|
|
struct pci_sriov *iov = dev->sriov;
|
|
int i;
|
|
|
|
for (i = 0; i < iov->num_VFs; i++)
|
|
pci_iov_remove_virtfn(dev, i);
|
|
}
|
|
|
|
static void sriov_disable(struct pci_dev *dev)
|
|
{
|
|
struct pci_sriov *iov = dev->sriov;
|
|
|
|
if (!iov->num_VFs)
|
|
return;
|
|
|
|
sriov_del_vfs(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");
|
|
|
|
iov->num_VFs = 0;
|
|
pci_iov_set_numvfs(dev, 0);
|
|
}
|
|
|
|
static int sriov_init(struct pci_dev *dev, int pos)
|
|
{
|
|
int i, bar64;
|
|
int rc;
|
|
int nres;
|
|
u32 pgsz;
|
|
u16 ctrl, total;
|
|
struct pci_sriov *iov;
|
|
struct resource *res;
|
|
struct pci_dev *pdev;
|
|
|
|
pci_read_config_word(dev, pos + PCI_SRIOV_CTRL, &ctrl);
|
|
if (ctrl & PCI_SRIOV_CTRL_VFE) {
|
|
pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, 0);
|
|
ssleep(1);
|
|
}
|
|
|
|
ctrl = 0;
|
|
list_for_each_entry(pdev, &dev->bus->devices, bus_list)
|
|
if (pdev->is_physfn)
|
|
goto found;
|
|
|
|
pdev = NULL;
|
|
if (pci_ari_enabled(dev->bus))
|
|
ctrl |= PCI_SRIOV_CTRL_ARI;
|
|
|
|
found:
|
|
pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, ctrl);
|
|
|
|
pci_read_config_word(dev, pos + PCI_SRIOV_TOTAL_VF, &total);
|
|
if (!total)
|
|
return 0;
|
|
|
|
pci_read_config_dword(dev, pos + PCI_SRIOV_SUP_PGSIZE, &pgsz);
|
|
i = PAGE_SHIFT > 12 ? PAGE_SHIFT - 12 : 0;
|
|
pgsz &= ~((1 << i) - 1);
|
|
if (!pgsz)
|
|
return -EIO;
|
|
|
|
pgsz &= ~(pgsz - 1);
|
|
pci_write_config_dword(dev, pos + PCI_SRIOV_SYS_PGSIZE, pgsz);
|
|
|
|
iov = kzalloc(sizeof(*iov), GFP_KERNEL);
|
|
if (!iov)
|
|
return -ENOMEM;
|
|
|
|
nres = 0;
|
|
for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
|
|
res = &dev->resource[i + PCI_IOV_RESOURCES];
|
|
/*
|
|
* If it is already FIXED, don't change it, something
|
|
* (perhaps EA or header fixups) wants it this way.
|
|
*/
|
|
if (res->flags & IORESOURCE_PCI_FIXED)
|
|
bar64 = (res->flags & IORESOURCE_MEM_64) ? 1 : 0;
|
|
else
|
|
bar64 = __pci_read_base(dev, pci_bar_unknown, res,
|
|
pos + PCI_SRIOV_BAR + i * 4);
|
|
if (!res->flags)
|
|
continue;
|
|
if (resource_size(res) & (PAGE_SIZE - 1)) {
|
|
rc = -EIO;
|
|
goto failed;
|
|
}
|
|
iov->barsz[i] = resource_size(res);
|
|
res->end = res->start + resource_size(res) * total - 1;
|
|
pci_info(dev, "VF(n) BAR%d space: %pR (contains BAR%d for %d VFs)\n",
|
|
i, res, i, total);
|
|
i += bar64;
|
|
nres++;
|
|
}
|
|
|
|
iov->pos = pos;
|
|
iov->nres = nres;
|
|
iov->ctrl = ctrl;
|
|
iov->total_VFs = total;
|
|
iov->driver_max_VFs = total;
|
|
pci_read_config_word(dev, pos + PCI_SRIOV_VF_DID, &iov->vf_device);
|
|
iov->pgsz = pgsz;
|
|
iov->self = dev;
|
|
iov->drivers_autoprobe = true;
|
|
pci_read_config_dword(dev, pos + PCI_SRIOV_CAP, &iov->cap);
|
|
pci_read_config_byte(dev, pos + PCI_SRIOV_FUNC_LINK, &iov->link);
|
|
if (pci_pcie_type(dev) == PCI_EXP_TYPE_RC_END)
|
|
iov->link = PCI_DEVFN(PCI_SLOT(dev->devfn), iov->link);
|
|
|
|
if (pdev)
|
|
iov->dev = pci_dev_get(pdev);
|
|
else
|
|
iov->dev = dev;
|
|
|
|
dev->sriov = iov;
|
|
dev->is_physfn = 1;
|
|
rc = compute_max_vf_buses(dev);
|
|
if (rc)
|
|
goto fail_max_buses;
|
|
|
|
return 0;
|
|
|
|
fail_max_buses:
|
|
dev->sriov = NULL;
|
|
dev->is_physfn = 0;
|
|
failed:
|
|
for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
|
|
res = &dev->resource[i + PCI_IOV_RESOURCES];
|
|
res->flags = 0;
|
|
}
|
|
|
|
kfree(iov);
|
|
return rc;
|
|
}
|
|
|
|
static void sriov_release(struct pci_dev *dev)
|
|
{
|
|
BUG_ON(dev->sriov->num_VFs);
|
|
|
|
if (dev != dev->sriov->dev)
|
|
pci_dev_put(dev->sriov->dev);
|
|
|
|
kfree(dev->sriov);
|
|
dev->sriov = NULL;
|
|
}
|
|
|
|
static void sriov_restore_state(struct pci_dev *dev)
|
|
{
|
|
int i;
|
|
u16 ctrl;
|
|
struct pci_sriov *iov = dev->sriov;
|
|
|
|
pci_read_config_word(dev, iov->pos + PCI_SRIOV_CTRL, &ctrl);
|
|
if (ctrl & PCI_SRIOV_CTRL_VFE)
|
|
return;
|
|
|
|
/*
|
|
* Restore PCI_SRIOV_CTRL_ARI before pci_iov_set_numvfs() because
|
|
* it reads offset & stride, which depend on PCI_SRIOV_CTRL_ARI.
|
|
*/
|
|
ctrl &= ~PCI_SRIOV_CTRL_ARI;
|
|
ctrl |= iov->ctrl & PCI_SRIOV_CTRL_ARI;
|
|
pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, ctrl);
|
|
|
|
for (i = 0; i < PCI_SRIOV_NUM_BARS; i++)
|
|
pci_update_resource(dev, i + PCI_IOV_RESOURCES);
|
|
|
|
pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz);
|
|
pci_iov_set_numvfs(dev, iov->num_VFs);
|
|
pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
|
|
if (iov->ctrl & PCI_SRIOV_CTRL_VFE)
|
|
msleep(100);
|
|
}
|
|
|
|
/**
|
|
* pci_iov_init - initialize the IOV capability
|
|
* @dev: the PCI device
|
|
*
|
|
* Returns 0 on success, or negative on failure.
|
|
*/
|
|
int pci_iov_init(struct pci_dev *dev)
|
|
{
|
|
int pos;
|
|
|
|
if (!pci_is_pcie(dev))
|
|
return -ENODEV;
|
|
|
|
pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV);
|
|
if (pos)
|
|
return sriov_init(dev, pos);
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
/**
|
|
* pci_iov_release - release resources used by the IOV capability
|
|
* @dev: the PCI device
|
|
*/
|
|
void pci_iov_release(struct pci_dev *dev)
|
|
{
|
|
if (dev->is_physfn)
|
|
sriov_release(dev);
|
|
}
|
|
|
|
/**
|
|
* pci_iov_remove - clean up SR-IOV state after PF driver is detached
|
|
* @dev: the PCI device
|
|
*/
|
|
void pci_iov_remove(struct pci_dev *dev)
|
|
{
|
|
struct pci_sriov *iov = dev->sriov;
|
|
|
|
if (!dev->is_physfn)
|
|
return;
|
|
|
|
iov->driver_max_VFs = iov->total_VFs;
|
|
if (iov->num_VFs)
|
|
pci_warn(dev, "driver left SR-IOV enabled after remove\n");
|
|
}
|
|
|
|
/**
|
|
* pci_iov_update_resource - update a VF BAR
|
|
* @dev: the PCI device
|
|
* @resno: the resource number
|
|
*
|
|
* Update a VF BAR in the SR-IOV capability of a PF.
|
|
*/
|
|
void pci_iov_update_resource(struct pci_dev *dev, int resno)
|
|
{
|
|
struct pci_sriov *iov = dev->is_physfn ? dev->sriov : NULL;
|
|
struct resource *res = dev->resource + resno;
|
|
int vf_bar = resno - PCI_IOV_RESOURCES;
|
|
struct pci_bus_region region;
|
|
u16 cmd;
|
|
u32 new;
|
|
int reg;
|
|
|
|
/*
|
|
* The generic pci_restore_bars() path calls this for all devices,
|
|
* including VFs and non-SR-IOV devices. If this is not a PF, we
|
|
* have nothing to do.
|
|
*/
|
|
if (!iov)
|
|
return;
|
|
|
|
pci_read_config_word(dev, iov->pos + PCI_SRIOV_CTRL, &cmd);
|
|
if ((cmd & PCI_SRIOV_CTRL_VFE) && (cmd & PCI_SRIOV_CTRL_MSE)) {
|
|
dev_WARN(&dev->dev, "can't update enabled VF BAR%d %pR\n",
|
|
vf_bar, res);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Ignore unimplemented BARs, unused resource slots for 64-bit
|
|
* BARs, and non-movable resources, e.g., those described via
|
|
* Enhanced Allocation.
|
|
*/
|
|
if (!res->flags)
|
|
return;
|
|
|
|
if (res->flags & IORESOURCE_UNSET)
|
|
return;
|
|
|
|
if (res->flags & IORESOURCE_PCI_FIXED)
|
|
return;
|
|
|
|
pcibios_resource_to_bus(dev->bus, ®ion, res);
|
|
new = region.start;
|
|
new |= res->flags & ~PCI_BASE_ADDRESS_MEM_MASK;
|
|
|
|
reg = iov->pos + PCI_SRIOV_BAR + 4 * vf_bar;
|
|
pci_write_config_dword(dev, reg, new);
|
|
if (res->flags & IORESOURCE_MEM_64) {
|
|
new = region.start >> 16 >> 16;
|
|
pci_write_config_dword(dev, reg + 4, new);
|
|
}
|
|
}
|
|
|
|
resource_size_t __weak pcibios_iov_resource_alignment(struct pci_dev *dev,
|
|
int resno)
|
|
{
|
|
return pci_iov_resource_size(dev, resno);
|
|
}
|
|
|
|
/**
|
|
* pci_sriov_resource_alignment - get resource alignment for VF BAR
|
|
* @dev: the PCI device
|
|
* @resno: the resource number
|
|
*
|
|
* Returns the alignment of the VF BAR found in the SR-IOV capability.
|
|
* This is not the same as the resource size which is defined as
|
|
* the VF BAR size multiplied by the number of VFs. The alignment
|
|
* is just the VF BAR size.
|
|
*/
|
|
resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno)
|
|
{
|
|
return pcibios_iov_resource_alignment(dev, resno);
|
|
}
|
|
|
|
/**
|
|
* pci_restore_iov_state - restore the state of the IOV capability
|
|
* @dev: the PCI device
|
|
*/
|
|
void pci_restore_iov_state(struct pci_dev *dev)
|
|
{
|
|
if (dev->is_physfn)
|
|
sriov_restore_state(dev);
|
|
}
|
|
|
|
/**
|
|
* pci_vf_drivers_autoprobe - set PF property drivers_autoprobe for VFs
|
|
* @dev: the PCI device
|
|
* @auto_probe: set VF drivers auto probe flag
|
|
*/
|
|
void pci_vf_drivers_autoprobe(struct pci_dev *dev, bool auto_probe)
|
|
{
|
|
if (dev->is_physfn)
|
|
dev->sriov->drivers_autoprobe = auto_probe;
|
|
}
|
|
|
|
/**
|
|
* pci_iov_bus_range - find bus range used by Virtual Function
|
|
* @bus: the PCI bus
|
|
*
|
|
* Returns max number of buses (exclude current one) used by Virtual
|
|
* Functions.
|
|
*/
|
|
int pci_iov_bus_range(struct pci_bus *bus)
|
|
{
|
|
int max = 0;
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
if (!dev->is_physfn)
|
|
continue;
|
|
if (dev->sriov->max_VF_buses > max)
|
|
max = dev->sriov->max_VF_buses;
|
|
}
|
|
|
|
return max ? max - bus->number : 0;
|
|
}
|
|
|
|
/**
|
|
* pci_enable_sriov - enable the SR-IOV capability
|
|
* @dev: the PCI device
|
|
* @nr_virtfn: number of virtual functions to enable
|
|
*
|
|
* Returns 0 on success, or negative on failure.
|
|
*/
|
|
int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
|
|
{
|
|
might_sleep();
|
|
|
|
if (!dev->is_physfn)
|
|
return -ENOSYS;
|
|
|
|
return sriov_enable(dev, nr_virtfn);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_enable_sriov);
|
|
|
|
/**
|
|
* pci_disable_sriov - disable the SR-IOV capability
|
|
* @dev: the PCI device
|
|
*/
|
|
void pci_disable_sriov(struct pci_dev *dev)
|
|
{
|
|
might_sleep();
|
|
|
|
if (!dev->is_physfn)
|
|
return;
|
|
|
|
sriov_disable(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_disable_sriov);
|
|
|
|
/**
|
|
* pci_num_vf - return number of VFs associated with a PF device_release_driver
|
|
* @dev: the PCI device
|
|
*
|
|
* Returns number of VFs, or 0 if SR-IOV is not enabled.
|
|
*/
|
|
int pci_num_vf(struct pci_dev *dev)
|
|
{
|
|
if (!dev->is_physfn)
|
|
return 0;
|
|
|
|
return dev->sriov->num_VFs;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_num_vf);
|
|
|
|
/**
|
|
* pci_vfs_assigned - returns number of VFs are assigned to a guest
|
|
* @dev: the PCI device
|
|
*
|
|
* Returns number of VFs belonging to this device that are assigned to a guest.
|
|
* If device is not a physical function returns 0.
|
|
*/
|
|
int pci_vfs_assigned(struct pci_dev *dev)
|
|
{
|
|
struct pci_dev *vfdev;
|
|
unsigned int vfs_assigned = 0;
|
|
unsigned short dev_id;
|
|
|
|
/* only search if we are a PF */
|
|
if (!dev->is_physfn)
|
|
return 0;
|
|
|
|
/*
|
|
* determine the device ID for the VFs, the vendor ID will be the
|
|
* same as the PF so there is no need to check for that one
|
|
*/
|
|
dev_id = dev->sriov->vf_device;
|
|
|
|
/* loop through all the VFs to see if we own any that are assigned */
|
|
vfdev = pci_get_device(dev->vendor, dev_id, NULL);
|
|
while (vfdev) {
|
|
/*
|
|
* It is considered assigned if it is a virtual function with
|
|
* our dev as the physical function and the assigned bit is set
|
|
*/
|
|
if (vfdev->is_virtfn && (vfdev->physfn == dev) &&
|
|
pci_is_dev_assigned(vfdev))
|
|
vfs_assigned++;
|
|
|
|
vfdev = pci_get_device(dev->vendor, dev_id, vfdev);
|
|
}
|
|
|
|
return vfs_assigned;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_vfs_assigned);
|
|
|
|
/**
|
|
* pci_sriov_set_totalvfs -- reduce the TotalVFs available
|
|
* @dev: the PCI PF device
|
|
* @numvfs: number that should be used for TotalVFs supported
|
|
*
|
|
* Should be called from PF driver's probe routine with
|
|
* device's mutex held.
|
|
*
|
|
* Returns 0 if PF is an SRIOV-capable device and
|
|
* value of numvfs valid. If not a PF return -ENOSYS;
|
|
* if numvfs is invalid return -EINVAL;
|
|
* if VFs already enabled, return -EBUSY.
|
|
*/
|
|
int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs)
|
|
{
|
|
if (!dev->is_physfn)
|
|
return -ENOSYS;
|
|
|
|
if (numvfs > dev->sriov->total_VFs)
|
|
return -EINVAL;
|
|
|
|
/* Shouldn't change if VFs already enabled */
|
|
if (dev->sriov->ctrl & PCI_SRIOV_CTRL_VFE)
|
|
return -EBUSY;
|
|
|
|
dev->sriov->driver_max_VFs = numvfs;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_sriov_set_totalvfs);
|
|
|
|
/**
|
|
* pci_sriov_get_totalvfs -- get total VFs supported on this device
|
|
* @dev: the PCI PF device
|
|
*
|
|
* For a PCIe device with SRIOV support, return the PCIe
|
|
* SRIOV capability value of TotalVFs or the value of driver_max_VFs
|
|
* if the driver reduced it. Otherwise 0.
|
|
*/
|
|
int pci_sriov_get_totalvfs(struct pci_dev *dev)
|
|
{
|
|
if (!dev->is_physfn)
|
|
return 0;
|
|
|
|
return dev->sriov->driver_max_VFs;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_sriov_get_totalvfs);
|
|
|
|
/**
|
|
* pci_sriov_configure_simple - helper to configure SR-IOV
|
|
* @dev: the PCI device
|
|
* @nr_virtfn: number of virtual functions to enable, 0 to disable
|
|
*
|
|
* Enable or disable SR-IOV for devices that don't require any PF setup
|
|
* before enabling SR-IOV. Return value is negative on error, or number of
|
|
* VFs allocated on success.
|
|
*/
|
|
int pci_sriov_configure_simple(struct pci_dev *dev, int nr_virtfn)
|
|
{
|
|
int rc;
|
|
|
|
might_sleep();
|
|
|
|
if (!dev->is_physfn)
|
|
return -ENODEV;
|
|
|
|
if (pci_vfs_assigned(dev)) {
|
|
pci_warn(dev, "Cannot modify SR-IOV while VFs are assigned\n");
|
|
return -EPERM;
|
|
}
|
|
|
|
if (nr_virtfn == 0) {
|
|
sriov_disable(dev);
|
|
return 0;
|
|
}
|
|
|
|
rc = sriov_enable(dev, nr_virtfn);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
return nr_virtfn;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_sriov_configure_simple);
|