[PATCH 10/13 v7] PCI: support the SR-IOV capability

Yu Zhao
2008-11-21T19:40:12Z

Support Single Root I/O Virtualization (SR-IOV) capability.

Signed-off-by: Yu Zhao <yu.zhao@intel.com>

---
drivers/pci/Kconfig | 13 ++
drivers/pci/Makefile | 3 +
drivers/pci/iov.c | 491 ++++++++++++++++++++++++++++++++++++++++++++++
drivers/pci/pci-driver.c | 12 +-
drivers/pci/pci.c | 8 +
drivers/pci/pci.h | 51 +++++
drivers/pci/probe.c | 4 +
include/linux/pci.h | 9 +
include/linux/pci_regs.h | 21 ++
9 files changed, 610 insertions(+), 2 deletions(-)
create mode 100644 drivers/pci/iov.c

diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index e1ca425..493233e 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -50,3 +50,16 @@ config HT_IRQ
This allows native hypertransport devices to use interrupts.

If unsure say Y.
+
+config PCI_IOV
+ bool "PCI IOV support"
+ depends on PCI
+ select PCI_MSI
+ default n
+ help
+ PCI-SIG I/O Virtualization (IOV) Specifications support.
+ Single Root IOV: allows the Physical Function device driver
+ to enable the hardware capability, so the Virtual Function
+ is accessible via the PCI configuration space using its own
+ Bus, Device and Function Number. Each Virtual Function also
+ has PCI Memory Space to map its own register set.
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index af3bfe2..8c7c12d 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -29,6 +29,9 @@ obj-$(CONFIG_DMAR) += dmar.o iova.o intel-iommu.o

obj-$(CONFIG_INTR_REMAP) += dmar.o intr_remapping.o

+# PCI IOV support
+obj-$(CONFIG_PCI_IOV) += iov.o
+
#
# Some architectures use the generic PCI setup functions
#
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
new file mode 100644
index 0000000..03f62ca
--- /dev/null
+++ b/drivers/pci/iov.c
@@ -0,0 +1,491 @@
+/*
+ * drivers/pci/iov.c
+ *
+ * Copyright (C) 2008 Intel Corporation
+ *
+ * PCI Express I/O Virtualization (IOV) support.
+ * Single Root IOV 1.0
+ */
+
+#include <linux/ctype.h>
+#include <linux/string.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <asm/page.h>
+#include "pci.h"
+
+
+#define pci_iov_attr(field) \
+static ssize_t iov_##field##_show(struct device *dev, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ struct pci_dev *pdev = to_pci_dev(dev); \
+ return sprintf(buf, "%d\n", pdev->iov->field); \
+}
+
+pci_iov_attr(total);
+pci_iov_attr(initial);
+pci_iov_attr(nr_virtfn);
+
+static inline void virtfn_bdf(struct pci_dev *dev, int id, u8 *busnr, u8 *devfn)
+{
+ u16 bdf;
+
+ bdf = (dev->bus->number << 8) + dev->devfn +
+ dev->iov->offset + dev->iov->stride * id;
+ *busnr = bdf >> 8;
+ *devfn = bdf & 0xff;
+}
+
+static int virtfn_add(struct pci_dev *dev, int id)
+{
+ int i;
+ int rc;
+ u8 busnr, devfn;
+ struct pci_dev *virtfn;
+ struct resource *res;
+ resource_size_t size;
+
+ virtfn_bdf(dev, id, &busnr, &devfn);
+
+ virtfn = alloc_pci_dev();
+ if (!virtfn)
+ return -ENOMEM;
+
+ virtfn->bus = pci_find_bus(pci_domain_nr(dev->bus), busnr);
+ BUG_ON(!virtfn->bus);
+ virtfn->sysdata = dev->bus->sysdata;
+ virtfn->dev.parent = dev->dev.parent;
+ virtfn->dev.bus = dev->dev.bus;
+ virtfn->devfn = devfn;
+ virtfn->hdr_type = PCI_HEADER_TYPE_NORMAL;
+ virtfn->multifunction = 0;
+ virtfn->vendor = dev->vendor;
+ pci_read_config_word(dev, dev->iov->cap + PCI_IOV_VF_DID,
+ &virtfn->device);
+ virtfn->cfg_size = PCI_CFG_SPACE_EXP_SIZE;
+ virtfn->error_state = pci_channel_io_normal;
+ virtfn->is_pcie = 1;
+ virtfn->pcie_type = PCI_EXP_TYPE_ENDPOINT;
+ virtfn->dma_mask = 0xffffffff;
+
+ dev_set_name(&virtfn->dev, "%04x:%02x:%02x.%d",
+ pci_domain_nr(virtfn->bus), busnr,
+ PCI_SLOT(devfn), PCI_FUNC(devfn));
+
+ pci_read_config_byte(virtfn, PCI_REVISION_ID, &virtfn->revision);
+ virtfn->class = dev->class;
+ virtfn->current_state = PCI_UNKNOWN;
+ virtfn->irq = 0;
+
+ for (i = 0; i < PCI_IOV_NUM_BAR; i++) {
+ res = dev->resource + PCI_IOV_RESOURCES + i;
+ if (!res->parent)
+ continue;
+ virtfn->resource[i].name = pci_name(virtfn);
+ virtfn->resource[i].flags = res->flags;
+ size = resource_size(res);
+ do_div(size, dev->iov->total);
+ virtfn->resource[i].start = res->start + size * id;
+ virtfn->resource[i].end = virtfn->resource[i].start + size - 1;
+ rc = request_resource(res, &virtfn->resource[i]);
+ BUG_ON(rc);
+ }
+
+ virtfn->subsystem_vendor = dev->subsystem_vendor;
+ pci_read_config_word(virtfn, PCI_SUBSYSTEM_ID,
+ &virtfn->subsystem_device);
+
+ pci_device_add(virtfn, virtfn->bus);
+ rc = pci_bus_add_device(virtfn);
+
+ return rc;
+}
+
+static void virtfn_remove(struct pci_dev *dev, int id)
+{
+ u8 busnr, devfn;
+ struct pci_bus *bus;
+ struct pci_dev *virtfn;
+
+ virtfn_bdf(dev, id, &busnr, &devfn);
+
+ bus = pci_find_bus(pci_domain_nr(dev->bus), busnr);
+ BUG_ON(!bus);
+ virtfn = pci_get_slot(bus, devfn);
+ BUG_ON(!virtfn);
+ pci_dev_put(virtfn);
+ pci_remove_bus_device(virtfn);
+}
+
+static int iov_add_bus(struct pci_bus *bus, int busnr)
+{
+ int i;
+ int rc;
+ struct pci_bus *child;
+
+ for (i = bus->number + 1; i <= busnr; i++) {
+ child = pci_find_bus(pci_domain_nr(bus), i);
+ if (child)
+ continue;
+ child = pci_add_new_bus(bus, NULL, i);
+ if (!child)
+ return -ENOMEM;
+
+ child->subordinate = i;
+ child->dev.parent = bus->bridge;
+ rc = pci_bus_add_child(child);
+ if (rc)
+ return rc;
+ }
+
+ return 0;
+}
+
+static void iov_remove_bus(struct pci_bus *bus, int busnr)
+{
+ int i;
+ struct pci_bus *child;
+
+ for (i = bus->number + 1; i <= busnr; i++) {
+ child = pci_find_bus(pci_domain_nr(bus), i);
+ BUG_ON(!child);
+ if (list_empty(&child->devices))
+ pci_remove_bus(child);
+ }
+}
+
+static int iov_enable(struct pci_dev *dev, int nr_virtfn)
+{
+ int i, j;
+ int rc;
+ u8 busnr, devfn;
+ u16 ctrl, offset, stride;
+
+ pci_write_config_word(dev, dev->iov->cap + PCI_IOV_NUM_VF, nr_virtfn);
+ pci_read_config_word(dev, dev->iov->cap + PCI_IOV_VF_OFFSET, &offset);
+ pci_read_config_word(dev, dev->iov->cap + PCI_IOV_VF_STRIDE, &stride);
+
+ if (!offset || (nr_virtfn > 1 && !stride))
+ return -EIO;
+
+ dev->iov->offset = offset;
+ dev->iov->stride = stride;
+
+ virtfn_bdf(dev, nr_virtfn - 1, &busnr, &devfn);
+ if (busnr > dev->bus->subordinate)
+ return -EIO;
+
+ rc = dev->driver->virtual(dev, nr_virtfn);
+ if (rc)
+ return rc;
+
+ pci_read_config_word(dev, dev->iov->cap + PCI_IOV_CTRL, &ctrl);
+ ctrl |= PCI_IOV_CTRL_VFE | PCI_IOV_CTRL_MSE;
+ pci_write_config_word(dev, dev->iov->cap + PCI_IOV_CTRL, ctrl);
+ ssleep(1);
+
+ iov_add_bus(dev->bus, busnr);
+ for (i = 0; i < nr_virtfn; i++) {
+ rc = virtfn_add(dev, i);
+ if (rc)
+ goto failed;
+ }
+
+ dev->iov->nr_virtfn = nr_virtfn;
+
+ return 0;
+
+failed:
+ for (j = 0; j < i; j++)
+ virtfn_remove(dev, j);
+
+ iov_remove_bus(dev->bus, busnr);
+
+ ctrl &= ~(PCI_IOV_CTRL_VFE | PCI_IOV_CTRL_MSE);
+ pci_write_config_word(dev, dev->iov->cap + PCI_IOV_CTRL, ctrl);
+ ssleep(1);
+
+ return rc;
+}
+
+static void iov_disable(struct pci_dev *dev)
+{
+ int i;
+ int rc;
+ u16 ctrl;
+ u8 busnr, devfn;
+
+ if (!dev->iov->nr_virtfn)
+ return;
+
+ rc = dev->driver->virtual(dev, 0);
+ if (rc)
+ return;
+
+ for (i = 0; i < dev->iov->nr_virtfn; i++)
+ virtfn_remove(dev, i);
+
+ virtfn_bdf(dev, dev->iov->nr_virtfn - 1, &busnr, &devfn);
+ iov_remove_bus(dev->bus, busnr);
+
+ pci_read_config_word(dev, dev->iov->cap + PCI_IOV_CTRL, &ctrl);
+ ctrl &= ~(PCI_IOV_CTRL_VFE | PCI_IOV_CTRL_MSE);
+ pci_write_config_word(dev, dev->iov->cap + PCI_IOV_CTRL, ctrl);
+ ssleep(1);
+
+ dev->iov->nr_virtfn = 0;
+}
+
+static ssize_t iov_set_nr_virtfn(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int rc;
+ long nr_virtfn;
+ struct pci_dev *pdev = to_pci_dev(dev);
+
+ rc = strict_strtol(buf, 0, &nr_virtfn);
+ if (rc)
+ return rc;
+
+ if (nr_virtfn < 0 || nr_virtfn > pdev->iov->initial)
+ return -EINVAL;
+
+ if (nr_virtfn == pdev->iov->nr_virtfn)
+ return count;
+
+ mutex_lock(&pdev->iov->physfn->iov->lock);
+ iov_disable(pdev);
+
+ if (nr_virtfn)
+ rc = iov_enable(pdev, nr_virtfn);
+ mutex_unlock(&pdev->iov->physfn->iov->lock);
+
+ return rc ? rc : count;
+}
+
+static DEVICE_ATTR(total_virtfn, S_IRUGO, iov_total_show, NULL);
+static DEVICE_ATTR(initial_virtfn, S_IRUGO, iov_initial_show, NULL);
+static DEVICE_ATTR(nr_virtfn, S_IWUSR | S_IRUGO,
+ iov_nr_virtfn_show, iov_set_nr_virtfn);
+
+static struct attribute *iov_attrs[] = {
+ &dev_attr_total_virtfn.attr,
+ &dev_attr_initial_virtfn.attr,
+ &dev_attr_nr_virtfn.attr,
+ NULL
+};
+
+static struct attribute_group iov_attr_group = {
+ .attrs = iov_attrs,
+ .name = "iov",
+};
+
+/**
+ * pci_iov_init - initialize device's SR-IOV capability
+ * @dev: the PCI device
+ *
+ * Returns 0 on success, or negative on failure.
+ *
+ * The major differences between Virtual Function and PCI device are:
+ * 1) the device with multiple bus numbers uses internal routing, so
+ * there is no explicit bridge device in this case.
+ * 2) Virtual Function memory spaces are designated by BARs encapsulated
+ * in the capability structure, and the BARs in Virtual Function PCI
+ * configuration space are read-only zero.
+ */
+int pci_iov_init(struct pci_dev *dev)
+{
+ int i;
+ int pos;
+ u32 pgsz;
+ u16 ctrl, total, initial, offset, stride;
+ struct pci_iov *iov;
+ struct resource *res;
+ struct pci_dev *physfn;
+
+ if (!dev->is_pcie)
+ return -ENODEV;
+
+ if (dev->pcie_type != PCI_EXP_TYPE_RC_END &&
+ dev->pcie_type != PCI_EXP_TYPE_ENDPOINT)
+ return -ENODEV;
+
+ pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_IOV);
+ if (!pos)
+ return -ENODEV;
+
+ pci_read_config_word(dev, pos + PCI_IOV_CTRL, &ctrl);
+ if (ctrl & PCI_IOV_CTRL_VFE) {
+ pci_write_config_word(dev, pos + PCI_IOV_CTRL, 0);
+ ssleep(1);
+ }
+
+ physfn = NULL;
+ if (!list_empty(&dev->bus->devices))
+ list_for_each_entry(physfn, &dev->bus->devices, bus_list)
+ if (physfn->iov)
+ break;
+
+ ctrl = 0;
+ if (!(physfn && physfn->iov) && pci_ari_enabled(dev->bus))
+ ctrl |= PCI_IOV_CTRL_ARI;
+
+ pci_write_config_word(dev, pos + PCI_IOV_CTRL, ctrl);
+ pci_read_config_word(dev, pos + PCI_IOV_TOTAL_VF, &total);
+ pci_read_config_word(dev, pos + PCI_IOV_INITIAL_VF, &initial);
+ pci_write_config_word(dev, pos + PCI_IOV_NUM_VF, initial);
+ pci_read_config_word(dev, pos + PCI_IOV_VF_OFFSET, &offset);
+ pci_read_config_word(dev, pos + PCI_IOV_VF_STRIDE, &stride);
+
+ if (!total || initial > total || (initial && !offset) ||
+ (initial > 1 && !stride))
+ return -EIO;
+
+ pci_read_config_dword(dev, pos + PCI_IOV_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_IOV_SYS_PGSIZE, pgsz);
+
+ iov = kzalloc(sizeof(*iov), GFP_KERNEL);
+ if (!iov)
+ return -ENOMEM;
+
+ iov->cap = pos;
+ iov->total = total;
+ iov->initial = initial;
+ iov->offset = offset;
+ iov->stride = stride;
+ iov->pgsz = pgsz;
+
+ for (i = 0; i < PCI_IOV_NUM_BAR; i++) {
+ res = dev->resource + PCI_IOV_RESOURCES + i;
+ pos = iov->cap + PCI_IOV_BAR_0 + i * 4;
+ i += __pci_read_base(dev, pci_bar_unknown, res, pos);
+ if (!res->flags)
+ continue;
+ res->end = res->start + resource_size(res) * total - 1;
+ }
+
+ if (physfn && physfn->iov) {
+ pci_dev_get(physfn);
+ iov->physfn = physfn;
+ } else {
+ mutex_init(&iov->lock);
+ iov->physfn = dev;
+ }
+
+ dev->iov = iov;
+
+ return 0;
+}
+
+/**
+ * pci_iov_release - release resources used by the SR-IOV capability
+ * @dev: the PCI device
+ */
+void pci_iov_release(struct pci_dev *dev)
+{
+ if (!dev->iov)
+ return;
+
+ if (dev == dev->iov->physfn)
+ mutex_destroy(&dev->iov->lock);
+ else
+ pci_dev_put(dev->iov->physfn);
+
+ kfree(dev->iov);
+}
+
+/**
+ * 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->iov);
+
+ *type = pci_bar_unknown;
+ return dev->iov->cap + PCI_IOV_BAR_0 +
+ 4 * (resno - PCI_IOV_RESOURCES);
+}
+
+/**
+ * pci_restore_iov_state - restore the state of the SR-IOV capability
+ * @dev: the PCI device
+ */
+void pci_restore_iov_state(struct pci_dev *dev)
+{
+ u16 ctrl;
+
+ if (!dev->iov)
+ return;
+
+ pci_read_config_word(dev, dev->iov->cap + PCI_IOV_CTRL, &ctrl);
+ if (ctrl & PCI_IOV_CTRL_VFE)
+ return;
+
+ pci_write_config_dword(dev, dev->iov->cap + PCI_IOV_SYS_PGSIZE,
+ dev->iov->pgsz);
+ ctrl = 0;
+ if (dev == dev->iov->physfn && pci_ari_enabled(dev->bus))
+ ctrl |= PCI_IOV_CTRL_ARI;
+ pci_write_config_word(dev, dev->iov->cap + PCI_IOV_CTRL, ctrl);
+
+ if (!dev->iov->nr_virtfn)
+ return;
+
+ pci_write_config_word(dev, dev->iov->cap + PCI_IOV_NUM_VF,
+ dev->iov->nr_virtfn);
+ ctrl |= PCI_IOV_CTRL_VFE | PCI_IOV_CTRL_MSE;
+ pci_write_config_word(dev, dev->iov->cap + PCI_IOV_CTRL, ctrl);
+
+ ssleep(1);
+}
+
+/**
+ * pci_iov_register - register the SR-IOV capability
+ * @dev: the PCI device
+ */
+int pci_iov_register(struct pci_dev *dev)
+{
+ int rc;
+
+ if (!dev->iov)
+ return -ENODEV;
+
+ rc = sysfs_create_group(&dev->dev.kobj, &iov_attr_group);
+ if (rc)
+ return rc;
+
+ rc = kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE);
+
+ return rc;
+}
+
+/**
+ * pci_iov_unregister - unregister the SR-IOV capability
+ * @dev: the PCI device
+ */
+void pci_iov_unregister(struct pci_dev *dev)
+{
+ if (!dev->iov)
+ return;
+
+ sysfs_remove_group(&dev->dev.kobj, &iov_attr_group);
+ iov_disable(dev);
+ kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE);
+}
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index b4cdd69..3d5f3a3 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -234,6 +234,8 @@ __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
error = pci_call_probe(drv, pci_dev, id);
if (error >= 0) {
pci_dev->driver = drv;
+ if (drv->virtual)
+ pci_iov_register(pci_dev);
error = 0;
}
}
@@ -262,6 +264,8 @@ static int pci_device_remove(struct device * dev)
struct pci_driver * drv = pci_dev->driver;

if (drv) {
+ if (drv->virtual)
+ pci_iov_unregister(pci_dev);
if (drv->remove)
drv->remove(pci_dev);
pci_dev->driver = NULL;
@@ -292,8 +296,12 @@ static void pci_device_shutdown(struct device *dev)
struct pci_dev *pci_dev = to_pci_dev(dev);
struct pci_driver *drv = pci_dev->driver;

- if (drv && drv->shutdown)
- drv->shutdown(pci_dev);
+ if (drv) {
+ if (drv->virtual)
+ pci_iov_unregister(pci_dev);
+ if (drv->shutdown)
+ drv->shutdown(pci_dev);
+ }
pci_msi_shutdown(pci_dev);
pci_msix_shutdown(pci_dev);
}
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 9382b5f..ca26e53 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -763,6 +763,7 @@ pci_restore_state(struct pci_dev *dev)
}
pci_restore_pcix_state(dev);
pci_restore_msi_state(dev);
+ pci_restore_iov_state(dev);

return 0;
}
@@ -2017,12 +2018,19 @@ int pci_select_bars(struct pci_dev *dev, unsigned long flags)
*/
int pci_resource_bar(struct pci_dev *dev, int resno, enum pci_bar_type *type)
{
+ int reg;
+
if (resno < PCI_ROM_RESOURCE) {
*type = pci_bar_unknown;
return PCI_BASE_ADDRESS_0 + 4 * resno;
} else if (resno == PCI_ROM_RESOURCE) {
*type = pci_bar_mem32;
return dev->rom_base_reg;
+ } else if (resno < PCI_BRIDGE_RESOURCES) {
+ /* device specific resource */
+ reg = pci_iov_resource_bar(dev, resno, type);
+ if (reg)
+ return reg;
}

dev_err(&dev->dev, "BAR: invalid resource #%d\n", resno);
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 315bbe6..3113d11 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -183,4 +183,55 @@ static inline int pci_ari_enabled(struct pci_bus *bus)
return bus->self && bus->self->ari_enabled;
}

+/* Single Root I/O Virtualization */
+struct pci_iov {
+ int cap; /* capability position */
+ int status; /* status of SR-IOV */
+ u16 total; /* total VFs associated with the PF */
+ u16 initial; /* initial VFs associated with the PF */
+ u16 nr_virtfn; /* number of VFs available */
+ u16 offset; /* first VF Routing ID offset */
+ u16 stride; /* following VF stride */
+ u32 pgsz; /* page size for BAR alignment */
+ struct pci_dev *physfn; /* lowest numbered PF */
+ struct mutex lock; /* lock for VF bus */
+};
+
+#ifdef CONFIG_PCI_IOV
+extern int pci_iov_init(struct pci_dev *dev);
+extern void pci_iov_release(struct pci_dev *dev);
+extern int pci_iov_resource_bar(struct pci_dev *dev, int resno,
+ enum pci_bar_type *type);
+extern int pci_iov_register(struct pci_dev *dev);
+extern void pci_iov_unregister(struct pci_dev *dev);
+extern void pci_restore_iov_state(struct pci_dev *dev);
+#else
+static inline int pci_iov_init(struct pci_dev *dev)
+{
+ return -EIO;
+}
+static inline void pci_iov_release(struct pci_dev *dev)
+
+{
+}
+
+static inline int pci_iov_resource_bar(struct pci_dev *dev, int resno,
+ enum pci_bar_type *type)
+{
+ return 0;
+}
+
+static inline int pci_iov_register(struct pci_dev *dev)
+{
+}
+
+static inline void pci_iov_unregister(struct pci_dev *dev)
+{
+}
+
+static inline void pci_restore_iov_state(struct pci_dev *dev)
+{
+}
+#endif /* CONFIG_PCI_IOV */
+
#endif /* DRIVERS_PCI_H */
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index cd205fd..cb26e64 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -785,6 +785,7 @@ static int pci_setup_device(struct pci_dev * dev)
static void pci_release_capabilities(struct pci_dev *dev)
{
pci_vpd_release(dev);
+ pci_iov_release(dev);
}

/**
@@ -968,6 +969,9 @@ static void pci_init_capabilities(struct pci_dev *dev)

/* Alternative Routing-ID Forwarding */
pci_enable_ari(dev);
+
+ /* Single Root I/O Virtualization */
+ pci_iov_init(dev);
}

void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
diff --git a/include/linux/pci.h b/include/linux/pci.h
index d455ec8..c9046a3 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -93,6 +93,12 @@ enum {
/* #6: expansion ROM resource */
PCI_ROM_RESOURCE,

+ /* device specific resources */
+#ifdef CONFIG_PCI_IOV
+ PCI_IOV_RESOURCES,
+ PCI_IOV_RESOURCE_END = PCI_IOV_RESOURCES + PCI_IOV_NUM_BAR - 1,
+#endif
+
/* resources assigned to buses behind the bridge */
#define PCI_BRIDGE_RESOURCE_NUM 4

@@ -171,6 +177,7 @@ struct pci_cap_saved_state {

struct pcie_link_state;
struct pci_vpd;
+struct pci_iov;

/*
* The pci_dev structure is used to describe PCI devices.
@@ -259,6 +266,7 @@ struct pci_dev {
struct list_head msi_list;
#endif
struct pci_vpd *vpd;
+ struct pci_iov *iov;
};

extern struct pci_dev *alloc_pci_dev(void);
@@ -426,6 +434,7 @@ struct pci_driver {
int (*resume_early) (struct pci_dev *dev);
int (*resume) (struct pci_dev *dev); /* Device woken up */
void (*shutdown) (struct pci_dev *dev);
+ int (*virtual) (struct pci_dev *dev, int nr_virtfn);
struct pm_ext_ops *pm;
struct pci_error_handlers *err_handler;
struct device_driver driver;
diff --git a/include/linux/pci_regs.h b/include/linux/pci_regs.h
index e5effd4..1d1ade2 100644
--- a/include/linux/pci_regs.h
+++ b/include/linux/pci_regs.h
@@ -363,6 +363,7 @@
#define PCI_EXP_TYPE_UPSTREAM 0x5 /* Upstream Port */
#define PCI_EXP_TYPE_DOWNSTREAM 0x6 /* Downstream Port */
#define PCI_EXP_TYPE_PCI_BRIDGE 0x7 /* PCI/PCI-X Bridge */
+#define PCI_EXP_TYPE_RC_END 0x9 /* Root Complex Integrated Endpoint */
#define PCI_EXP_FLAGS_SLOT 0x0100 /* Slot implemented */
#define PCI_EXP_FLAGS_IRQ 0x3e00 /* Interrupt message number */
#define PCI_EXP_DEVCAP 4 /* Device capabilities */
@@ -436,6 +437,7 @@
#define PCI_EXT_CAP_ID_DSN 3
#define PCI_EXT_CAP_ID_PWR 4
#define PCI_EXT_CAP_ID_ARI 14
+#define PCI_EXT_CAP_ID_IOV 16

/* Advanced Error Reporting */
#define PCI_ERR_UNCOR_STATUS 4 /* Uncorrectable Error Status */
@@ -553,4 +555,23 @@
#define PCI_ARI_CTRL_ACS 0x0002 /* ACS Function Groups Enable */
#define PCI_ARI_CTRL_FG(x) (((x) >> 4) & 7) /* Function Group */

+/* Single Root I/O Virtualization */
+#define PCI_IOV_CAP 0x04 /* SR-IOV Capabilities */
+#define PCI_IOV_CTRL 0x08 /* SR-IOV Control */
+#define PCI_IOV_CTRL_VFE 0x01 /* VF Enable */
+#define PCI_IOV_CTRL_MSE 0x08 /* VF Memory Space Enable */
+#define PCI_IOV_CTRL_ARI 0x10 /* ARI Capable Hierarchy */
+#define PCI_IOV_STATUS 0x0a /* SR-IOV Status */
+#define PCI_IOV_INITIAL_VF 0x0c /* Initial VFs */
+#define PCI_IOV_TOTAL_VF 0x0e /* Total VFs */
+#define PCI_IOV_NUM_VF 0x10 /* Number of VFs */
+#define PCI_IOV_FUNC_LINK 0x12 /* Function Dependency Link */
+#define PCI_IOV_VF_OFFSET 0x14 /* First VF Offset */
+#define PCI_IOV_VF_STRIDE 0x16 /* Following VF Stride */
+#define PCI_IOV_VF_DID 0x1a /* VF Device ID */
+#define PCI_IOV_SUP_PGSIZE 0x1c /* Supported Page Sizes */
+#define PCI_IOV_SYS_PGSIZE 0x20 /* System Page Size */
+#define PCI_IOV_BAR_0 0x24 /* VF BAR0 */
+#define PCI_IOV_NUM_BAR 6 /* Number of VF BARs */
+
#endif /* LINUX_PCI_REGS_H */
--
1.5.6.4