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865 lines
19 KiB
865 lines
19 KiB
/*
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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/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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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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int rc;
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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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child->subordinate = busnr;
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child->dev.parent = bus->bridge;
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rc = pci_bus_add_child(child);
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if (rc) {
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pci_remove_bus(child);
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return NULL;
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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 *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;
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child = pci_find_bus(pci_domain_nr(bus), busnr);
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BUG_ON(!child);
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if (list_empty(&child->devices))
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pci_remove_bus(child);
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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;
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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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virtfn = alloc_pci_dev();
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if (!virtfn)
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return -ENOMEM;
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mutex_lock(&iov->dev->sriov->lock);
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virtfn->bus = virtfn_add_bus(dev->bus, virtfn_bus(dev, id));
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if (!virtfn->bus) {
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kfree(virtfn);
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mutex_unlock(&iov->dev->sriov->lock);
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return -ENOMEM;
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}
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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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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);
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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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virtfn->physfn = pci_dev_get(dev);
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virtfn->is_virtfn = 1;
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rc = pci_bus_add_device(virtfn);
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if (rc)
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goto failed1;
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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_remove_bus_device(virtfn);
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virtfn_remove_bus(dev->bus, virtfn_bus(dev, id));
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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_bus *bus;
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struct pci_dev *virtfn;
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struct pci_sriov *iov = dev->sriov;
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bus = pci_find_bus(pci_domain_nr(dev->bus), virtfn_bus(dev, id));
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if (!bus)
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return;
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virtfn = pci_get_slot(bus, virtfn_devfn(dev, id));
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if (!virtfn)
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return;
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pci_dev_put(virtfn);
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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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sysfs_remove_link(&virtfn->dev.kobj, "physfn");
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mutex_lock(&iov->dev->sriov->lock);
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pci_remove_bus_device(virtfn);
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virtfn_remove_bus(dev->bus, virtfn_bus(dev, id));
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mutex_unlock(&iov->dev->sriov->lock);
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pci_dev_put(dev);
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}
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static int sriov_migration(struct pci_dev *dev)
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{
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u16 status;
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struct pci_sriov *iov = dev->sriov;
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if (!iov->nr_virtfn)
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return 0;
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if (!(iov->cap & PCI_SRIOV_CAP_VFM))
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return 0;
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pci_read_config_word(dev, iov->pos + PCI_SRIOV_STATUS, &status);
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if (!(status & PCI_SRIOV_STATUS_VFM))
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return 0;
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schedule_work(&iov->mtask);
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return 1;
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}
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static void sriov_migration_task(struct work_struct *work)
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{
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int i;
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u8 state;
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u16 status;
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struct pci_sriov *iov = container_of(work, struct pci_sriov, mtask);
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for (i = iov->initial; i < iov->nr_virtfn; i++) {
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state = readb(iov->mstate + i);
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if (state == PCI_SRIOV_VFM_MI) {
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writeb(PCI_SRIOV_VFM_AV, iov->mstate + i);
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state = readb(iov->mstate + i);
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if (state == PCI_SRIOV_VFM_AV)
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virtfn_add(iov->self, i, 1);
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} else if (state == PCI_SRIOV_VFM_MO) {
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virtfn_remove(iov->self, i, 1);
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writeb(PCI_SRIOV_VFM_UA, iov->mstate + i);
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state = readb(iov->mstate + i);
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if (state == PCI_SRIOV_VFM_AV)
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virtfn_add(iov->self, i, 0);
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}
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}
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pci_read_config_word(iov->self, iov->pos + PCI_SRIOV_STATUS, &status);
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status &= ~PCI_SRIOV_STATUS_VFM;
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pci_write_config_word(iov->self, iov->pos + PCI_SRIOV_STATUS, status);
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}
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static int sriov_enable_migration(struct pci_dev *dev, int nr_virtfn)
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{
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int bir;
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u32 table;
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resource_size_t pa;
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struct pci_sriov *iov = dev->sriov;
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if (nr_virtfn <= iov->initial)
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return 0;
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pci_read_config_dword(dev, iov->pos + PCI_SRIOV_VFM, &table);
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bir = PCI_SRIOV_VFM_BIR(table);
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if (bir > PCI_STD_RESOURCE_END)
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return -EIO;
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table = PCI_SRIOV_VFM_OFFSET(table);
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if (table + nr_virtfn > pci_resource_len(dev, bir))
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return -EIO;
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pa = pci_resource_start(dev, bir) + table;
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iov->mstate = ioremap(pa, nr_virtfn);
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if (!iov->mstate)
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return -ENOMEM;
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INIT_WORK(&iov->mtask, sriov_migration_task);
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iov->ctrl |= PCI_SRIOV_CTRL_VFM | PCI_SRIOV_CTRL_INTR;
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pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
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return 0;
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}
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static void sriov_disable_migration(struct pci_dev *dev)
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{
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struct pci_sriov *iov = dev->sriov;
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iov->ctrl &= ~(PCI_SRIOV_CTRL_VFM | PCI_SRIOV_CTRL_INTR);
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pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
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cancel_work_sync(&iov->mtask);
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iounmap(iov->mstate);
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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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if (!nr_virtfn)
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return 0;
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if (iov->nr_virtfn)
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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 ||
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(!(iov->cap & PCI_SRIOV_CAP_VFM) && (initial != iov->total)))
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return -EIO;
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if (nr_virtfn < 0 || nr_virtfn > iov->total ||
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(!(iov->cap & PCI_SRIOV_CAP_VFM) && (nr_virtfn > initial)))
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return -EINVAL;
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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, &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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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->subordinate) {
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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 (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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pci_dev_put(pdev);
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if (!pdev->is_physfn)
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return -ENODEV;
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rc = sysfs_create_link(&dev->dev.kobj,
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&pdev->dev.kobj, "dep_link");
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if (rc)
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return rc;
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}
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iov->ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE;
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pci_block_user_cfg_access(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_unblock_user_cfg_access(dev);
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iov->initial = 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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if (iov->cap & PCI_SRIOV_CAP_VFM) {
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rc = sriov_enable_migration(dev, nr_virtfn);
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if (rc)
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goto failed;
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}
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|
|
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kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE);
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iov->nr_virtfn = nr_virtfn;
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|
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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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|
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iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
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pci_block_user_cfg_access(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_unblock_user_cfg_access(dev);
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|
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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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|
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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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|
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if (!iov->nr_virtfn)
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return;
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|
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if (iov->cap & PCI_SRIOV_CAP_VFM)
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sriov_disable_migration(dev);
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|
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for (i = 0; i < iov->nr_virtfn; i++)
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virtfn_remove(dev, i, 0);
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|
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iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
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pci_block_user_cfg_access(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_unblock_user_cfg_access(dev);
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|
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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->nr_virtfn = 0;
|
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}
|
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|
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static int sriov_init(struct pci_dev *dev, int pos)
|
|
{
|
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int i;
|
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int rc;
|
|
int nres;
|
|
u32 pgsz;
|
|
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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|
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if (dev->pcie_type != PCI_EXP_TYPE_RC_END &&
|
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dev->pcie_type != PCI_EXP_TYPE_ENDPOINT)
|
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return -ENODEV;
|
|
|
|
pci_read_config_word(dev, pos + PCI_SRIOV_CTRL, &ctrl);
|
|
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);
|
|
}
|
|
|
|
pci_read_config_word(dev, pos + PCI_SRIOV_TOTAL_VF, &total);
|
|
if (!total)
|
|
return 0;
|
|
|
|
ctrl = 0;
|
|
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;
|
|
if (pci_ari_enabled(dev->bus))
|
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ctrl |= PCI_SRIOV_CTRL_ARI;
|
|
|
|
found:
|
|
pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, ctrl);
|
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pci_write_config_word(dev, pos + PCI_SRIOV_NUM_VF, total);
|
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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;
|
|
|
|
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);
|
|
|
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nres = 0;
|
|
for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
|
|
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);
|
|
if (!res->flags)
|
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continue;
|
|
if (resource_size(res) & (PAGE_SIZE - 1)) {
|
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rc = -EIO;
|
|
goto failed;
|
|
}
|
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res->end = res->start + resource_size(res) * total - 1;
|
|
nres++;
|
|
}
|
|
|
|
iov = kzalloc(sizeof(*iov), GFP_KERNEL);
|
|
if (!iov) {
|
|
rc = -ENOMEM;
|
|
goto failed;
|
|
}
|
|
|
|
iov->pos = pos;
|
|
iov->nres = nres;
|
|
iov->ctrl = ctrl;
|
|
iov->total = total;
|
|
iov->offset = offset;
|
|
iov->stride = stride;
|
|
iov->pgsz = pgsz;
|
|
iov->self = dev;
|
|
pci_read_config_dword(dev, pos + PCI_SRIOV_CAP, &iov->cap);
|
|
pci_read_config_byte(dev, pos + PCI_SRIOV_FUNC_LINK, &iov->link);
|
|
if (dev->pcie_type == 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;
|
|
|
|
mutex_init(&iov->lock);
|
|
|
|
dev->sriov = iov;
|
|
dev->is_physfn = 1;
|
|
|
|
return 0;
|
|
|
|
failed:
|
|
for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
|
|
res = dev->resource + PCI_IOV_RESOURCES + i;
|
|
res->flags = 0;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void sriov_release(struct pci_dev *dev)
|
|
{
|
|
BUG_ON(dev->sriov->nr_virtfn);
|
|
|
|
if (dev != dev->sriov->dev)
|
|
pci_dev_put(dev->sriov->dev);
|
|
|
|
mutex_destroy(&dev->sriov->lock);
|
|
|
|
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;
|
|
|
|
for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++)
|
|
pci_update_resource(dev, i);
|
|
|
|
pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz);
|
|
pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, iov->nr_virtfn);
|
|
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_resource_bar - get position of the SR-IOV BAR
|
|
* @dev: the PCI device
|
|
* @resno: the resource number
|
|
* @type: the BAR type to be filled in
|
|
*
|
|
* Returns position of the BAR encapsulated in the SR-IOV capability.
|
|
*/
|
|
int pci_iov_resource_bar(struct pci_dev *dev, int resno,
|
|
enum pci_bar_type *type)
|
|
{
|
|
if (resno < PCI_IOV_RESOURCES || resno > PCI_IOV_RESOURCE_END)
|
|
return 0;
|
|
|
|
BUG_ON(!dev->is_physfn);
|
|
|
|
*type = pci_bar_unknown;
|
|
|
|
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.
|
|
*/
|
|
int pci_sriov_resource_alignment(struct pci_dev *dev, int resno)
|
|
{
|
|
struct resource tmp;
|
|
enum pci_bar_type type;
|
|
int reg = pci_iov_resource_bar(dev, resno, &type);
|
|
|
|
if (!reg)
|
|
return 0;
|
|
|
|
__pci_read_base(dev, type, &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 - 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 -ENODEV;
|
|
|
|
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_sriov_migration - notify SR-IOV core of Virtual Function Migration
|
|
* @dev: the PCI device
|
|
*
|
|
* Returns IRQ_HANDLED if the IRQ is handled, or IRQ_NONE if not.
|
|
*
|
|
* Physical Function driver is responsible to register IRQ handler using
|
|
* VF Migration Interrupt Message Number, and call this function when the
|
|
* interrupt is generated by the hardware.
|
|
*/
|
|
irqreturn_t pci_sriov_migration(struct pci_dev *dev)
|
|
{
|
|
if (!dev->is_physfn)
|
|
return IRQ_NONE;
|
|
|
|
return sriov_migration(dev) ? IRQ_HANDLED : IRQ_NONE;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_sriov_migration);
|
|
|
|
/**
|
|
* 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 || !dev->is_physfn)
|
|
return 0;
|
|
else
|
|
return dev->sriov->nr_virtfn;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_num_vf);
|
|
|
|
static int ats_alloc_one(struct pci_dev *dev, int ps)
|
|
{
|
|
int pos;
|
|
u16 cap;
|
|
struct pci_ats *ats;
|
|
|
|
pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ATS);
|
|
if (!pos)
|
|
return -ENODEV;
|
|
|
|
ats = kzalloc(sizeof(*ats), GFP_KERNEL);
|
|
if (!ats)
|
|
return -ENOMEM;
|
|
|
|
ats->pos = pos;
|
|
ats->stu = ps;
|
|
pci_read_config_word(dev, pos + PCI_ATS_CAP, &cap);
|
|
ats->qdep = PCI_ATS_CAP_QDEP(cap) ? PCI_ATS_CAP_QDEP(cap) :
|
|
PCI_ATS_MAX_QDEP;
|
|
dev->ats = ats;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ats_free_one(struct pci_dev *dev)
|
|
{
|
|
kfree(dev->ats);
|
|
dev->ats = NULL;
|
|
}
|
|
|
|
/**
|
|
* pci_enable_ats - enable the ATS capability
|
|
* @dev: the PCI device
|
|
* @ps: the IOMMU page shift
|
|
*
|
|
* Returns 0 on success, or negative on failure.
|
|
*/
|
|
int pci_enable_ats(struct pci_dev *dev, int ps)
|
|
{
|
|
int rc;
|
|
u16 ctrl;
|
|
|
|
BUG_ON(dev->ats && dev->ats->is_enabled);
|
|
|
|
if (ps < PCI_ATS_MIN_STU)
|
|
return -EINVAL;
|
|
|
|
if (dev->is_physfn || dev->is_virtfn) {
|
|
struct pci_dev *pdev = dev->is_physfn ? dev : dev->physfn;
|
|
|
|
mutex_lock(&pdev->sriov->lock);
|
|
if (pdev->ats)
|
|
rc = pdev->ats->stu == ps ? 0 : -EINVAL;
|
|
else
|
|
rc = ats_alloc_one(pdev, ps);
|
|
|
|
if (!rc)
|
|
pdev->ats->ref_cnt++;
|
|
mutex_unlock(&pdev->sriov->lock);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
if (!dev->is_physfn) {
|
|
rc = ats_alloc_one(dev, ps);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
ctrl = PCI_ATS_CTRL_ENABLE;
|
|
if (!dev->is_virtfn)
|
|
ctrl |= PCI_ATS_CTRL_STU(ps - PCI_ATS_MIN_STU);
|
|
pci_write_config_word(dev, dev->ats->pos + PCI_ATS_CTRL, ctrl);
|
|
|
|
dev->ats->is_enabled = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_disable_ats - disable the ATS capability
|
|
* @dev: the PCI device
|
|
*/
|
|
void pci_disable_ats(struct pci_dev *dev)
|
|
{
|
|
u16 ctrl;
|
|
|
|
BUG_ON(!dev->ats || !dev->ats->is_enabled);
|
|
|
|
pci_read_config_word(dev, dev->ats->pos + PCI_ATS_CTRL, &ctrl);
|
|
ctrl &= ~PCI_ATS_CTRL_ENABLE;
|
|
pci_write_config_word(dev, dev->ats->pos + PCI_ATS_CTRL, ctrl);
|
|
|
|
dev->ats->is_enabled = 0;
|
|
|
|
if (dev->is_physfn || dev->is_virtfn) {
|
|
struct pci_dev *pdev = dev->is_physfn ? dev : dev->physfn;
|
|
|
|
mutex_lock(&pdev->sriov->lock);
|
|
pdev->ats->ref_cnt--;
|
|
if (!pdev->ats->ref_cnt)
|
|
ats_free_one(pdev);
|
|
mutex_unlock(&pdev->sriov->lock);
|
|
}
|
|
|
|
if (!dev->is_physfn)
|
|
ats_free_one(dev);
|
|
}
|
|
|
|
/**
|
|
* pci_ats_queue_depth - query the ATS Invalidate Queue Depth
|
|
* @dev: the PCI device
|
|
*
|
|
* Returns the queue depth on success, or negative on failure.
|
|
*
|
|
* The ATS spec uses 0 in the Invalidate Queue Depth field to
|
|
* indicate that the function can accept 32 Invalidate Request.
|
|
* But here we use the `real' values (i.e. 1~32) for the Queue
|
|
* Depth; and 0 indicates the function shares the Queue with
|
|
* other functions (doesn't exclusively own a Queue).
|
|
*/
|
|
int pci_ats_queue_depth(struct pci_dev *dev)
|
|
{
|
|
int pos;
|
|
u16 cap;
|
|
|
|
if (dev->is_virtfn)
|
|
return 0;
|
|
|
|
if (dev->ats)
|
|
return dev->ats->qdep;
|
|
|
|
pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ATS);
|
|
if (!pos)
|
|
return -ENODEV;
|
|
|
|
pci_read_config_word(dev, pos + PCI_ATS_CAP, &cap);
|
|
|
|
return PCI_ATS_CAP_QDEP(cap) ? PCI_ATS_CAP_QDEP(cap) :
|
|
PCI_ATS_MAX_QDEP;
|
|
}
|
|
|