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1188 lines
27 KiB
1188 lines
27 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
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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 <[email protected]> |
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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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|
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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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|
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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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|
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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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|
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pci_bus_insert_busn_res(child, busnr, busnr); |
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|
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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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|
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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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|
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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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/* |
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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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|
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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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|
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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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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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int pci_iov_add_virtfn(struct pci_dev *dev, int id) |
|
{ |
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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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|
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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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|
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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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|
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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; |
|
|
|
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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|
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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); |
|
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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static ssize_t sriov_totalvfs_show(struct device *dev, |
|
struct device_attribute *attr, |
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char *buf) |
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{ |
|
struct pci_dev *pdev = to_pci_dev(dev); |
|
|
|
return sysfs_emit(buf, "%u\n", pci_sriov_get_totalvfs(pdev)); |
|
} |
|
|
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static ssize_t sriov_numvfs_show(struct device *dev, |
|
struct device_attribute *attr, |
|
char *buf) |
|
{ |
|
struct pci_dev *pdev = to_pci_dev(dev); |
|
u16 num_vfs; |
|
|
|
/* Serialize vs sriov_numvfs_store() so readers see valid num_VFs */ |
|
device_lock(&pdev->dev); |
|
num_vfs = pdev->sriov->num_VFs; |
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device_unlock(&pdev->dev); |
|
|
|
return sysfs_emit(buf, "%u\n", num_vfs); |
|
} |
|
|
|
/* |
|
* num_vfs > 0; number of VFs to enable |
|
* num_vfs = 0; disable all VFs |
|
* |
|
* Note: SRIOV spec does not allow partial VF |
|
* disable, so it's all or none. |
|
*/ |
|
static ssize_t sriov_numvfs_store(struct device *dev, |
|
struct device_attribute *attr, |
|
const char *buf, size_t count) |
|
{ |
|
struct pci_dev *pdev = to_pci_dev(dev); |
|
int ret; |
|
u16 num_vfs; |
|
|
|
ret = kstrtou16(buf, 0, &num_vfs); |
|
if (ret < 0) |
|
return ret; |
|
|
|
if (num_vfs > pci_sriov_get_totalvfs(pdev)) |
|
return -ERANGE; |
|
|
|
device_lock(&pdev->dev); |
|
|
|
if (num_vfs == pdev->sriov->num_VFs) |
|
goto exit; |
|
|
|
/* is PF driver loaded */ |
|
if (!pdev->driver) { |
|
pci_info(pdev, "no driver bound to device; cannot configure SR-IOV\n"); |
|
ret = -ENOENT; |
|
goto exit; |
|
} |
|
|
|
/* is PF driver loaded w/callback */ |
|
if (!pdev->driver->sriov_configure) { |
|
pci_info(pdev, "driver does not support SR-IOV configuration via sysfs\n"); |
|
ret = -ENOENT; |
|
goto exit; |
|
} |
|
|
|
if (num_vfs == 0) { |
|
/* disable VFs */ |
|
ret = pdev->driver->sriov_configure(pdev, 0); |
|
goto exit; |
|
} |
|
|
|
/* enable VFs */ |
|
if (pdev->sriov->num_VFs) { |
|
pci_warn(pdev, "%d VFs already enabled. Disable before enabling %d VFs\n", |
|
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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 |
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* @dev: the PCI PF device |
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* |
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* For a PCIe device with SRIOV support, return the PCIe |
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* SRIOV capability value of TotalVFs or the value of driver_max_VFs |
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* if the driver reduced it. Otherwise 0. |
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*/ |
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int pci_sriov_get_totalvfs(struct pci_dev *dev) |
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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->driver_max_VFs; |
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} |
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EXPORT_SYMBOL_GPL(pci_sriov_get_totalvfs); |
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/** |
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* pci_sriov_configure_simple - helper to configure SR-IOV |
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* @dev: the PCI device |
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* @nr_virtfn: number of virtual functions to enable, 0 to disable |
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* |
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* Enable or disable SR-IOV for devices that don't require any PF setup |
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* before enabling SR-IOV. Return value is negative on error, or number of |
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* VFs allocated on success. |
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*/ |
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int pci_sriov_configure_simple(struct pci_dev *dev, int nr_virtfn) |
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{ |
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int rc; |
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might_sleep(); |
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if (!dev->is_physfn) |
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return -ENODEV; |
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if (pci_vfs_assigned(dev)) { |
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pci_warn(dev, "Cannot modify SR-IOV while VFs are assigned\n"); |
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return -EPERM; |
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} |
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if (nr_virtfn == 0) { |
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sriov_disable(dev); |
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return 0; |
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} |
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rc = sriov_enable(dev, nr_virtfn); |
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if (rc < 0) |
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return rc; |
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return nr_virtfn; |
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} |
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EXPORT_SYMBOL_GPL(pci_sriov_configure_simple);
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