mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-09 17:36:39 +07:00
26ff46c6f2
pci_iov_resource_bar() always sets its 'pci_bar_type' parameter to 'pci_bar_unknown'. Drop the parameter and just use 'pci_bar_unknown' directly in the callers. No functional change intended. Signed-off-by: Myron Stowe <myron.stowe@redhat.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: Chris Wright <chrisw@sous-sol.org> CC: Yu Zhao <yuzhao@google.com>
690 lines
16 KiB
C
690 lines
16 KiB
C
/*
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* drivers/pci/iov.c
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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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* 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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#include <linux/pci.h>
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#include <linux/slab.h>
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#include <linux/mutex.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 <linux/pci-ats.h>
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#include "pci.h"
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#define VIRTFN_ID_LEN 16
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static inline u8 virtfn_bus(struct pci_dev *dev, int id)
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{
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return dev->bus->number + ((dev->devfn + dev->sriov->offset +
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dev->sriov->stride * id) >> 8);
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}
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static inline u8 virtfn_devfn(struct pci_dev *dev, int id)
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{
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return (dev->devfn + dev->sriov->offset +
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dev->sriov->stride * id) & 0xff;
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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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static int virtfn_add(struct pci_dev *dev, int id, int reset)
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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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char buf[VIRTFN_ID_LEN];
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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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mutex_lock(&iov->dev->sriov->lock);
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bus = virtfn_add_bus(dev->bus, 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 = virtfn_devfn(dev, id);
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virtfn->vendor = dev->vendor;
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pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_DID, &virtfn->device);
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pci_setup_device(virtfn);
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virtfn->dev.parent = dev->dev.parent;
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virtfn->physfn = pci_dev_get(dev);
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virtfn->is_virtfn = 1;
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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 + PCI_IOV_RESOURCES + i;
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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 = resource_size(res);
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do_div(size, iov->total_VFs);
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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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if (reset)
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__pci_reset_function(virtfn);
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pci_device_add(virtfn, virtfn->bus);
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mutex_unlock(&iov->dev->sriov->lock);
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pci_bus_add_device(virtfn);
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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 failed1;
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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 failed2;
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kobject_uevent(&virtfn->dev.kobj, KOBJ_CHANGE);
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return 0;
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failed2:
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sysfs_remove_link(&dev->dev.kobj, buf);
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failed1:
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pci_dev_put(dev);
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mutex_lock(&iov->dev->sriov->lock);
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pci_stop_and_remove_bus_device(virtfn);
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failed0:
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virtfn_remove_bus(dev->bus, bus);
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failed:
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mutex_unlock(&iov->dev->sriov->lock);
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return rc;
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}
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static void virtfn_remove(struct pci_dev *dev, int id, int reset)
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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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struct pci_sriov *iov = dev->sriov;
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virtfn = pci_get_domain_bus_and_slot(pci_domain_nr(dev->bus),
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virtfn_bus(dev, id),
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virtfn_devfn(dev, id));
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if (!virtfn)
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return;
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if (reset) {
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device_release_driver(&virtfn->dev);
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__pci_reset_function(virtfn);
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}
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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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mutex_lock(&iov->dev->sriov->lock);
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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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mutex_unlock(&iov->dev->sriov->lock);
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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 int sriov_enable(struct pci_dev *dev, int nr_virtfn)
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{
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int rc;
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int i, j;
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int nres;
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u16 offset, stride, initial;
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struct resource *res;
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struct pci_dev *pdev;
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struct pci_sriov *iov = dev->sriov;
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int bars = 0;
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if (!nr_virtfn)
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return 0;
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if (iov->num_VFs)
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return -EINVAL;
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pci_read_config_word(dev, iov->pos + PCI_SRIOV_INITIAL_VF, &initial);
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if (initial > iov->total_VFs ||
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(!(iov->cap & PCI_SRIOV_CAP_VFM) && (initial != iov->total_VFs)))
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return -EIO;
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if (nr_virtfn < 0 || nr_virtfn > iov->total_VFs ||
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(!(iov->cap & PCI_SRIOV_CAP_VFM) && (nr_virtfn > initial)))
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return -EINVAL;
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pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_OFFSET, &offset);
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pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_STRIDE, &stride);
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if (!offset || (nr_virtfn > 1 && !stride))
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return -EIO;
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nres = 0;
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for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
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bars |= (1 << (i + PCI_IOV_RESOURCES));
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res = dev->resource + PCI_IOV_RESOURCES + i;
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if (res->parent)
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nres++;
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}
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if (nres != iov->nres) {
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dev_err(&dev->dev, "not enough MMIO resources for SR-IOV\n");
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return -ENOMEM;
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}
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iov->offset = offset;
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iov->stride = stride;
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if (virtfn_bus(dev, nr_virtfn - 1) > dev->bus->busn_res.end) {
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dev_err(&dev->dev, "SR-IOV: bus number out of range\n");
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return -ENOMEM;
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}
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if (pci_enable_resources(dev, bars)) {
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dev_err(&dev->dev, "SR-IOV: IOV BARS not allocated\n");
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return -ENOMEM;
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}
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if (iov->link != dev->devfn) {
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pdev = pci_get_slot(dev->bus, iov->link);
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if (!pdev)
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return -ENODEV;
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if (!pdev->is_physfn) {
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pci_dev_put(pdev);
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return -ENOSYS;
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}
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rc = sysfs_create_link(&dev->dev.kobj,
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&pdev->dev.kobj, "dep_link");
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pci_dev_put(pdev);
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if (rc)
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return rc;
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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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iov->ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE;
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pci_cfg_access_lock(dev);
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pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
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msleep(100);
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pci_cfg_access_unlock(dev);
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iov->initial_VFs = initial;
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if (nr_virtfn < initial)
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initial = nr_virtfn;
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for (i = 0; i < initial; i++) {
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rc = virtfn_add(dev, i, 0);
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if (rc)
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goto failed;
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}
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kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE);
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iov->num_VFs = nr_virtfn;
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return 0;
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failed:
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for (j = 0; j < i; j++)
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virtfn_remove(dev, j, 0);
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iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
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pci_cfg_access_lock(dev);
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pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
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pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, 0);
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ssleep(1);
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pci_cfg_access_unlock(dev);
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if (iov->link != dev->devfn)
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sysfs_remove_link(&dev->dev.kobj, "dep_link");
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return rc;
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}
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static void sriov_disable(struct pci_dev *dev)
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{
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int i;
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struct pci_sriov *iov = dev->sriov;
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if (!iov->num_VFs)
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return;
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for (i = 0; i < iov->num_VFs; i++)
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virtfn_remove(dev, i, 0);
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iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
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pci_cfg_access_lock(dev);
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pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
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ssleep(1);
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pci_cfg_access_unlock(dev);
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if (iov->link != dev->devfn)
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sysfs_remove_link(&dev->dev.kobj, "dep_link");
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iov->num_VFs = 0;
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pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, 0);
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}
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static int sriov_init(struct pci_dev *dev, int pos)
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{
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int i;
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int rc;
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int nres;
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u32 pgsz;
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u16 ctrl, total, offset, stride;
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struct pci_sriov *iov;
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struct resource *res;
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struct pci_dev *pdev;
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if (pci_pcie_type(dev) != PCI_EXP_TYPE_RC_END &&
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pci_pcie_type(dev) != PCI_EXP_TYPE_ENDPOINT)
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return -ENODEV;
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pci_read_config_word(dev, pos + PCI_SRIOV_CTRL, &ctrl);
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if (ctrl & PCI_SRIOV_CTRL_VFE) {
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pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, 0);
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ssleep(1);
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}
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pci_read_config_word(dev, pos + PCI_SRIOV_TOTAL_VF, &total);
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if (!total)
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return 0;
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ctrl = 0;
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list_for_each_entry(pdev, &dev->bus->devices, bus_list)
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if (pdev->is_physfn)
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goto found;
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pdev = NULL;
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if (pci_ari_enabled(dev->bus))
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ctrl |= PCI_SRIOV_CTRL_ARI;
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found:
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pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, ctrl);
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pci_write_config_word(dev, pos + PCI_SRIOV_NUM_VF, 0);
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pci_read_config_word(dev, pos + PCI_SRIOV_VF_OFFSET, &offset);
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pci_read_config_word(dev, pos + PCI_SRIOV_VF_STRIDE, &stride);
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if (!offset || (total > 1 && !stride))
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return -EIO;
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pci_read_config_dword(dev, pos + PCI_SRIOV_SUP_PGSIZE, &pgsz);
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i = PAGE_SHIFT > 12 ? PAGE_SHIFT - 12 : 0;
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pgsz &= ~((1 << i) - 1);
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if (!pgsz)
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return -EIO;
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pgsz &= ~(pgsz - 1);
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pci_write_config_dword(dev, pos + PCI_SRIOV_SYS_PGSIZE, pgsz);
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nres = 0;
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for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
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res = dev->resource + PCI_IOV_RESOURCES + i;
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i += __pci_read_base(dev, pci_bar_unknown, res,
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pos + PCI_SRIOV_BAR + i * 4);
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if (!res->flags)
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continue;
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if (resource_size(res) & (PAGE_SIZE - 1)) {
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rc = -EIO;
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goto failed;
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}
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res->end = res->start + resource_size(res) * total - 1;
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nres++;
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}
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iov = kzalloc(sizeof(*iov), GFP_KERNEL);
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if (!iov) {
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rc = -ENOMEM;
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goto failed;
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}
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iov->pos = pos;
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iov->nres = nres;
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iov->ctrl = ctrl;
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iov->total_VFs = total;
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iov->offset = offset;
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iov->stride = stride;
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iov->pgsz = pgsz;
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iov->self = dev;
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pci_read_config_dword(dev, pos + PCI_SRIOV_CAP, &iov->cap);
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pci_read_config_byte(dev, pos + PCI_SRIOV_FUNC_LINK, &iov->link);
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if (pci_pcie_type(dev) == PCI_EXP_TYPE_RC_END)
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iov->link = PCI_DEVFN(PCI_SLOT(dev->devfn), iov->link);
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if (pdev)
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iov->dev = pci_dev_get(pdev);
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else
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iov->dev = dev;
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mutex_init(&iov->lock);
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dev->sriov = iov;
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dev->is_physfn = 1;
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return 0;
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failed:
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for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
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res = dev->resource + PCI_IOV_RESOURCES + i;
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res->flags = 0;
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}
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return rc;
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}
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static void sriov_release(struct pci_dev *dev)
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{
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BUG_ON(dev->sriov->num_VFs);
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if (dev != dev->sriov->dev)
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pci_dev_put(dev->sriov->dev);
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mutex_destroy(&dev->sriov->lock);
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kfree(dev->sriov);
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dev->sriov = NULL;
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}
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static void sriov_restore_state(struct pci_dev *dev)
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{
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int i;
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u16 ctrl;
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struct pci_sriov *iov = dev->sriov;
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pci_read_config_word(dev, iov->pos + PCI_SRIOV_CTRL, &ctrl);
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if (ctrl & PCI_SRIOV_CTRL_VFE)
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return;
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for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++)
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pci_update_resource(dev, i);
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pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz);
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pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, iov->num_VFs);
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pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
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if (iov->ctrl & PCI_SRIOV_CTRL_VFE)
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msleep(100);
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}
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/**
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* pci_iov_init - initialize the IOV capability
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* @dev: the PCI device
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*
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* Returns 0 on success, or negative on failure.
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*/
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int pci_iov_init(struct pci_dev *dev)
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{
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int pos;
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if (!pci_is_pcie(dev))
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return -ENODEV;
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pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV);
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if (pos)
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return sriov_init(dev, pos);
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return -ENODEV;
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}
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/**
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* pci_iov_release - release resources used by the IOV capability
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* @dev: the PCI device
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*/
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void pci_iov_release(struct pci_dev *dev)
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{
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if (dev->is_physfn)
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sriov_release(dev);
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}
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/**
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* pci_iov_resource_bar - get position of the SR-IOV BAR
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* @dev: the PCI device
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* @resno: the resource number
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*
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* Returns position of the BAR encapsulated in the SR-IOV capability.
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*/
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int pci_iov_resource_bar(struct pci_dev *dev, int resno)
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{
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if (resno < PCI_IOV_RESOURCES || resno > PCI_IOV_RESOURCE_END)
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return 0;
|
|
|
|
BUG_ON(!dev->is_physfn);
|
|
|
|
return dev->sriov->pos + PCI_SRIOV_BAR +
|
|
4 * (resno - PCI_IOV_RESOURCES);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
struct resource tmp;
|
|
int reg = pci_iov_resource_bar(dev, resno);
|
|
|
|
if (!reg)
|
|
return 0;
|
|
|
|
__pci_read_base(dev, pci_bar_unknown, &tmp, reg);
|
|
return resource_alignment(&tmp);
|
|
}
|
|
|
|
/**
|
|
* 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_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;
|
|
u8 busnr;
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
if (!dev->is_physfn)
|
|
continue;
|
|
busnr = virtfn_bus(dev, dev->sriov->total_VFs - 1);
|
|
if (busnr > max)
|
|
max = busnr;
|
|
}
|
|
|
|
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
|
|
*/
|
|
pci_read_config_word(dev, dev->sriov->pos + PCI_SRIOV_VF_DID, &dev_id);
|
|
|
|
/* 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;
|
|
else
|
|
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;
|
|
|
|
if (dev->sriov->driver_max_VFs)
|
|
return dev->sriov->driver_max_VFs;
|
|
|
|
return dev->sriov->total_VFs;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_sriov_get_totalvfs);
|