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Subject[PATCH 12/16 v6] PCI: support the SR-IOV capability
Support Single Root I/O Virtualization (SR-IOV) capability.

Cc: Alex Chiang <achiang@hp.com>
Cc: Grant Grundler <grundler@parisc-linux.org>
Cc: Greg KH <greg@kroah.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Matthew Wilcox <matthew@wil.cx>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Roland Dreier <rdreier@cisco.com>
Signed-off-by: Yu Zhao <yu.zhao@intel.com>

---
drivers/pci/Kconfig | 12 +
drivers/pci/Makefile | 2 +
drivers/pci/iov.c | 592 ++++++++++++++++++++++++++++++++++++++++++++++
drivers/pci/pci-sysfs.c | 4 +
drivers/pci/pci.c | 14 +
drivers/pci/pci.h | 48 ++++
drivers/pci/probe.c | 4 +
include/linux/pci.h | 39 +++
include/linux/pci_regs.h | 21 ++
9 files changed, 736 insertions(+), 0 deletions(-)
create mode 100644 drivers/pci/iov.c

diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index e1ca425..e7c0836 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -50,3 +50,15 @@ config HT_IRQ
This allows native hypertransport devices to use interrupts.

If unsure say Y.
+
+config PCI_IOV
+ bool "PCI SR-IOV support"
+ depends on PCI
+ select PCI_MSI
+ default n
+ help
+ This option allows device drivers to enable Single Root I/O
+ Virtualization. Each Virtual Function's PCI configuration
+ space can be accessed using its own Bus, Device and Function
+ Number (Routing ID). Each Virtual Function also has PCI Memory
+ Space, which is used to map its own register set.
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index 4b47f4e..abbfcfa 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -55,3 +55,5 @@ obj-$(CONFIG_PCI_SYSCALL) += syscall.o
ifeq ($(CONFIG_PCI_DEBUG),y)
EXTRA_CFLAGS += -DDEBUG
endif
+
+obj-$(CONFIG_PCI_IOV) += iov.o
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
new file mode 100644
index 0000000..dd299aa
--- /dev/null
+++ b/drivers/pci/iov.c
@@ -0,0 +1,592 @@
+/*
+ * drivers/pci/iov.c
+ *
+ * Copyright (C) 2008 Intel Corporation
+ *
+ * PCI Express Single Root I/O Virtualization capability support.
+ */
+
+#include <linux/ctype.h>
+#include <linux/string.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <asm/page.h>
+#include "pci.h"
+
+
+#define iov_config_attr(field) \
+static ssize_t 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); \
+}
+
+iov_config_attr(status);
+iov_config_attr(totalvfs);
+iov_config_attr(initialvfs);
+iov_config_attr(numvfs);
+
+static inline void vf_rid(struct pci_dev *dev, int vfn, u8 *busnr, u8 *devfn)
+{
+ u16 rid;
+
+ rid = (dev->bus->number << 8) + dev->devfn +
+ dev->iov->offset + dev->iov->stride * vfn;
+ *busnr = rid >> 8;
+ *devfn = rid & 0xff;
+}
+
+static int vf_add(struct pci_dev *dev, int vfn)
+{
+ int i;
+ int rc;
+ u8 busnr, devfn;
+ struct pci_dev *vf;
+ struct pci_bus *bus;
+ struct resource *res;
+ resource_size_t size;
+
+ vf_rid(dev, vfn, &busnr, &devfn);
+
+ vf = alloc_pci_dev();
+ if (!vf)
+ return -ENOMEM;
+
+ if (dev->bus->number == busnr)
+ vf->bus = bus = dev->bus;
+ else {
+ list_for_each_entry(bus, &dev->bus->children, node)
+ if (bus->number == busnr) {
+ vf->bus = bus;
+ break;
+ }
+ BUG_ON(!vf->bus);
+ }
+
+ vf->sysdata = bus->sysdata;
+ vf->dev.parent = dev->dev.parent;
+ vf->dev.bus = dev->dev.bus;
+ vf->devfn = devfn;
+ vf->hdr_type = PCI_HEADER_TYPE_NORMAL;
+ vf->multifunction = 0;
+ vf->vendor = dev->vendor;
+ pci_read_config_word(dev, dev->iov->cap + PCI_IOV_VF_DID, &vf->device);
+ vf->cfg_size = PCI_CFG_SPACE_EXP_SIZE;
+ vf->error_state = pci_channel_io_normal;
+ vf->is_pcie = 1;
+ vf->pcie_type = PCI_EXP_TYPE_ENDPOINT;
+ vf->dma_mask = 0xffffffff;
+
+ dev_set_name(&vf->dev, "%04x:%02x:%02x.%d", pci_domain_nr(bus),
+ busnr, PCI_SLOT(devfn), PCI_FUNC(devfn));
+
+ pci_read_config_byte(vf, PCI_REVISION_ID, &vf->revision);
+ vf->class = dev->class;
+ vf->current_state = PCI_UNKNOWN;
+ vf->irq = 0;
+
+ for (i = 0; i < PCI_IOV_NUM_BAR; i++) {
+ res = dev->resource + PCI_IOV_RESOURCES + i;
+ if (!res->parent)
+ continue;
+ vf->resource[i].name = pci_name(vf);
+ vf->resource[i].flags = res->flags;
+ size = resource_size(res);
+ do_div(size, dev->iov->totalvfs);
+ vf->resource[i].start = res->start + size * vfn;
+ vf->resource[i].end = vf->resource[i].start + size - 1;
+ rc = request_resource(res, &vf->resource[i]);
+ BUG_ON(rc);
+ }
+
+ vf->subsystem_vendor = dev->subsystem_vendor;
+ pci_read_config_word(vf, PCI_SUBSYSTEM_ID, &vf->subsystem_device);
+
+ pci_device_add(vf, bus);
+ return pci_bus_add_device(vf);
+}
+
+static void vf_remove(struct pci_dev *dev, int vfn)
+{
+ u8 busnr, devfn;
+ struct pci_dev *vf;
+
+ vf_rid(dev, vfn, &busnr, &devfn);
+
+ vf = pci_get_bus_and_slot(busnr, devfn);
+ if (!vf)
+ return;
+
+ pci_dev_put(vf);
+ pci_remove_bus_device(vf);
+}
+
+static int iov_enable(struct pci_dev *dev)
+{
+ int rc;
+ int i, j;
+ u16 ctrl;
+ struct pci_iov *iov = dev->iov;
+
+ if (!iov->callback)
+ return -ENODEV;
+
+ if (!iov->numvfs)
+ return -EINVAL;
+
+ if (iov->status)
+ return 0;
+
+ rc = iov->callback(dev, PCI_IOV_ENABLE);
+ if (rc)
+ return rc;
+
+ pci_read_config_word(dev, iov->cap + PCI_IOV_CTRL, &ctrl);
+ ctrl |= (PCI_IOV_CTRL_VFE | PCI_IOV_CTRL_MSE);
+ pci_write_config_word(dev, iov->cap + PCI_IOV_CTRL, ctrl);
+ ssleep(1);
+
+ for (i = 0; i < iov->numvfs; i++) {
+ rc = vf_add(dev, i);
+ if (rc)
+ goto failed;
+ }
+
+ iov->status = 1;
+ return 0;
+
+failed:
+ for (j = 0; j < i; j++)
+ vf_remove(dev, j);
+
+ pci_read_config_word(dev, iov->cap + PCI_IOV_CTRL, &ctrl);
+ ctrl &= ~(PCI_IOV_CTRL_VFE | PCI_IOV_CTRL_MSE);
+ pci_write_config_word(dev, iov->cap + PCI_IOV_CTRL, ctrl);
+ ssleep(1);
+
+ return rc;
+}
+
+static int iov_disable(struct pci_dev *dev)
+{
+ int i;
+ int rc;
+ u16 ctrl;
+ struct pci_iov *iov = dev->iov;
+
+ if (!iov->callback)
+ return -ENODEV;
+
+ if (!iov->status)
+ return 0;
+
+ rc = iov->callback(dev, PCI_IOV_DISABLE);
+ if (rc)
+ return rc;
+
+ for (i = 0; i < iov->numvfs; i++)
+ vf_remove(dev, i);
+
+ pci_read_config_word(dev, iov->cap + PCI_IOV_CTRL, &ctrl);
+ ctrl &= ~(PCI_IOV_CTRL_VFE | PCI_IOV_CTRL_MSE);
+ pci_write_config_word(dev, iov->cap + PCI_IOV_CTRL, ctrl);
+ ssleep(1);
+
+ iov->status = 0;
+ return 0;
+}
+
+static int iov_set_numvfs(struct pci_dev *dev, int numvfs)
+{
+ int rc;
+ u16 offset, stride;
+ struct pci_iov *iov = dev->iov;
+
+ if (!iov->callback)
+ return -ENODEV;
+
+ if (numvfs < 0 || numvfs > iov->initialvfs || iov->status)
+ return -EINVAL;
+
+ if (numvfs == iov->numvfs)
+ return 0;
+
+ rc = iov->callback(dev, PCI_IOV_NUMVFS | iov->numvfs);
+ if (rc)
+ return rc;
+
+ pci_write_config_word(dev, iov->cap + PCI_IOV_NUM_VF, numvfs);
+ pci_read_config_word(dev, iov->cap + PCI_IOV_VF_OFFSET, &offset);
+ pci_read_config_word(dev, iov->cap + PCI_IOV_VF_STRIDE, &stride);
+ if ((numvfs && !offset) || (numvfs > 1 && !stride))
+ return -EIO;
+
+ iov->offset = offset;
+ iov->stride = stride;
+ iov->numvfs = numvfs;
+ return 0;
+}
+
+static ssize_t status_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int rc;
+ long enable;
+ struct pci_dev *pdev = to_pci_dev(dev);
+
+ rc = strict_strtol(buf, 0, &enable);
+ if (rc)
+ return rc;
+
+ mutex_lock(&pdev->iov->ops_lock);
+ switch (enable) {
+ case 0:
+ rc = iov_disable(pdev);
+ break;
+ case 1:
+ rc = iov_enable(pdev);
+ break;
+ default:
+ rc = -EINVAL;
+ }
+ mutex_unlock(&pdev->iov->ops_lock);
+
+ return rc ? rc : count;
+}
+
+static ssize_t numvfs_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int rc;
+ long numvfs;
+ struct pci_dev *pdev = to_pci_dev(dev);
+
+ rc = strict_strtol(buf, 0, &numvfs);
+ if (rc)
+ return rc;
+
+ mutex_lock(&pdev->iov->ops_lock);
+ rc = iov_set_numvfs(pdev, numvfs);
+ mutex_unlock(&pdev->iov->ops_lock);
+
+ return rc ? rc : count;
+}
+
+static DEVICE_ATTR(totalvfs, S_IRUGO, totalvfs_show, NULL);
+static DEVICE_ATTR(initialvfs, S_IRUGO, initialvfs_show, NULL);
+static DEVICE_ATTR(numvfs, S_IWUSR | S_IRUGO, numvfs_show, numvfs_store);
+static DEVICE_ATTR(enable, S_IWUSR | S_IRUGO, status_show, status_store);
+
+static struct attribute *iov_attrs[] = {
+ &dev_attr_totalvfs.attr,
+ &dev_attr_initialvfs.attr,
+ &dev_attr_numvfs.attr,
+ &dev_attr_enable.attr,
+ NULL
+};
+
+static struct attribute_group iov_attr_group = {
+ .attrs = iov_attrs,
+ .name = "iov",
+};
+
+static int iov_alloc_bus(struct pci_bus *bus, int busnr)
+{
+ int i;
+ int rc;
+ struct pci_dev *dev;
+ struct pci_bus *child;
+
+ list_for_each_entry(dev, &bus->devices, bus_list)
+ if (dev->iov)
+ break;
+
+ BUG_ON(!dev->iov);
+ pci_dev_get(dev);
+ mutex_lock(&dev->iov->bus_lock);
+
+ for (i = bus->number + 1; i <= busnr; i++) {
+ list_for_each_entry(child, &bus->children, node)
+ if (child->number == i)
+ break;
+ if (child->number == i)
+ 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;
+ }
+
+ mutex_unlock(&dev->iov->bus_lock);
+
+ return 0;
+}
+
+static void iov_release_bus(struct pci_bus *bus)
+{
+ struct pci_dev *dev, *tmp;
+ struct pci_bus *child, *next;
+
+ list_for_each_entry(dev, &bus->devices, bus_list)
+ if (dev->iov)
+ break;
+
+ BUG_ON(!dev->iov);
+ mutex_lock(&dev->iov->bus_lock);
+
+ list_for_each_entry(tmp, &bus->devices, bus_list)
+ if (tmp->iov && tmp->iov->callback)
+ goto done;
+
+ list_for_each_entry_safe(child, next, &bus->children, node)
+ if (!child->bridge)
+ pci_remove_bus(child);
+done:
+ mutex_unlock(&dev->iov->bus_lock);
+ pci_dev_put(dev);
+}
+
+/**
+ * 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;
+
+ if (!dev->is_pcie || (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;
+
+ ctrl = pci_ari_enabled(dev) ? PCI_IOV_CTRL_ARI : 0;
+ pci_write_config_word(dev, pos + PCI_IOV_CTRL, ctrl);
+ ssleep(1);
+
+ 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->totalvfs = total;
+ iov->initialvfs = initial;
+ iov->offset = offset;
+ iov->stride = stride;
+ iov->align = pgsz << 12;
+
+ 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->flags &= ~IORESOURCE_SIZEALIGN;
+ res->end = res->start + resource_size(res) * total - 1;
+ }
+
+ mutex_init(&iov->ops_lock);
+ mutex_init(&iov->bus_lock);
+
+ dev->iov = iov;
+
+ return 0;
+}
+
+/**
+ * pci_iov_release - release resources used by SR-IOV capability
+ * @dev: the PCI device
+ */
+void pci_iov_release(struct pci_dev *dev)
+{
+ if (!dev->iov)
+ return;
+
+ mutex_destroy(&dev->iov->ops_lock);
+ mutex_destroy(&dev->iov->bus_lock);
+ kfree(dev->iov);
+ dev->iov = NULL;
+}
+
+/**
+ * pci_iov_create_sysfs - create sysfs for SR-IOV capability
+ * @dev: the PCI device
+ */
+void pci_iov_create_sysfs(struct pci_dev *dev)
+{
+ if (!dev->iov)
+ return;
+
+ sysfs_create_group(&dev->dev.kobj, &iov_attr_group);
+}
+
+/**
+ * pci_iov_remove_sysfs - remove sysfs of SR-IOV capability
+ * @dev: the PCI device
+ */
+void pci_iov_remove_sysfs(struct pci_dev *dev)
+{
+ if (!dev->iov)
+ return;
+
+ sysfs_remove_group(&dev->dev.kobj, &iov_attr_group);
+}
+
+int pci_iov_resource_align(struct pci_dev *dev, int resno)
+{
+ if (resno < PCI_IOV_RESOURCES || resno > PCI_IOV_RESOURCES_END)
+ return 0;
+
+ BUG_ON(!dev->iov);
+
+ return dev->iov->align;
+}
+
+int pci_iov_resource_bar(struct pci_dev *dev, int resno,
+ enum pci_bar_type *type)
+{
+ if (resno < PCI_IOV_RESOURCES || resno > PCI_IOV_RESOURCES_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_iov_register - register SR-IOV service
+ * @dev: the PCI device
+ * @callback: callback function for SR-IOV events
+ *
+ * Returns 0 on success, or negative on failure.
+ */
+int pci_iov_register(struct pci_dev *dev,
+ int (*callback)(struct pci_dev *, u32))
+{
+ u8 busnr, devfn;
+ struct pci_iov *iov = dev->iov;
+
+ if (!iov)
+ return -ENODEV;
+
+ if (!callback || iov->callback)
+ return -EINVAL;
+
+ vf_rid(dev, iov->totalvfs - 1, &busnr, &devfn);
+ if (busnr > dev->bus->subordinate)
+ return -EIO;
+
+ iov->callback = callback;
+ return iov_alloc_bus(dev->bus, busnr);
+}
+EXPORT_SYMBOL_GPL(pci_iov_register);
+
+/**
+ * pci_iov_unregister - unregister SR-IOV service
+ * @dev: the PCI device
+ */
+void pci_iov_unregister(struct pci_dev *dev)
+{
+ struct pci_iov *iov = dev->iov;
+
+ if (!iov || !iov->callback)
+ return;
+
+ iov->callback = NULL;
+ iov_release_bus(dev->bus);
+}
+EXPORT_SYMBOL_GPL(pci_iov_unregister);
+
+/**
+ * pci_iov_enable - enable SR-IOV capability
+ * @dev: the PCI device
+ * @numvfs: number of VFs to be available
+ *
+ * Returns 0 on success, or negative on failure.
+ */
+int pci_iov_enable(struct pci_dev *dev, int numvfs)
+{
+ int rc;
+ struct pci_iov *iov = dev->iov;
+
+ if (!iov)
+ return -ENODEV;
+
+ if (!iov->callback)
+ return -EINVAL;
+
+ mutex_lock(&iov->ops_lock);
+ rc = iov_set_numvfs(dev, numvfs);
+ if (rc)
+ goto done;
+ rc = iov_enable(dev);
+done:
+ mutex_unlock(&iov->ops_lock);
+
+ return rc;
+}
+EXPORT_SYMBOL_GPL(pci_iov_enable);
+
+/**
+ * pci_iov_disable - disable SR-IOV capability
+ * @dev: the PCI device
+ *
+ * Should be called upon Physical Function driver removal, and power
+ * state change. All previous allocated Virtual Functions are reclaimed.
+ */
+void pci_iov_disable(struct pci_dev *dev)
+{
+ struct pci_iov *iov = dev->iov;
+
+ if (!iov || !iov->callback)
+ return;
+
+ mutex_lock(&iov->ops_lock);
+ iov_disable(dev);
+ mutex_unlock(&iov->ops_lock);
+}
+EXPORT_SYMBOL_GPL(pci_iov_disable);
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 5c456ab..18881f2 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -847,6 +847,9 @@ static int pci_create_capabilities_sysfs(struct pci_dev *dev)
/* Active State Power Management */
pcie_aspm_create_sysfs_dev_files(dev);

+ /* Single Root I/O Virtualization */
+ pci_iov_create_sysfs(dev);
+
return 0;
}

@@ -932,6 +935,7 @@ static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
}

pcie_aspm_remove_sysfs_dev_files(dev);
+ pci_iov_remove_sysfs(dev);
}

/**
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 11ecd6f..10a43b2 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1936,6 +1936,13 @@ int pci_resource_alignment(struct pci_dev *dev, int resno)
if (align)
return align > bios_align ? align : bios_align;

+ if (resno > PCI_ROM_RESOURCE && resno < PCI_BRIDGE_RESOURCES) {
+ /* device specific resource */
+ align = pci_iov_resource_align(dev, resno);
+ if (align)
+ return align > bios_align ? align : bios_align;
+ }
+
dev_err(&dev->dev, "alignment: invalid resource #%d\n", resno);
return 0;
}
@@ -1950,12 +1957,19 @@ int pci_resource_alignment(struct pci_dev *dev, int resno)
*/
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 d707477..7735d92 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -181,4 +181,52 @@ static inline int pci_ari_enabled(struct pci_dev *dev)
return dev->ari_enabled;
}

+/* Single Root I/O Virtualization */
+struct pci_iov {
+ int cap; /* capability position */
+ int align; /* page size used to map memory space */
+ int status; /* status of SR-IOV */
+ u16 totalvfs; /* total VFs associated with the PF */
+ u16 initialvfs; /* initial VFs associated with the PF */
+ u16 numvfs; /* number of VFs available */
+ u16 offset; /* first VF Routing ID offset */
+ u16 stride; /* following VF stride */
+ struct mutex ops_lock; /* lock for SR-IOV operations */
+ struct mutex bus_lock; /* lock for VF bus */
+ int (*callback)(struct pci_dev *, u32); /* event callback function */
+};
+
+#ifdef CONFIG_PCI_IOV
+extern int pci_iov_init(struct pci_dev *dev);
+extern void pci_iov_release(struct pci_dev *dev);
+void pci_iov_create_sysfs(struct pci_dev *dev);
+void pci_iov_remove_sysfs(struct pci_dev *dev);
+extern int pci_iov_resource_align(struct pci_dev *dev, int resno);
+extern int pci_iov_resource_bar(struct pci_dev *dev, int resno,
+ enum pci_bar_type *type);
+#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 void pci_iov_create_sysfs(struct pci_dev *dev)
+{
+}
+static inline void pci_iov_remove_sysfs(struct pci_dev *dev)
+{
+}
+static inline int pci_iov_resource_align(struct pci_dev *dev, int resno)
+{
+ return 0;
+}
+static inline int pci_iov_resource_bar(struct pci_dev *dev, int resno,
+ enum pci_bar_type *type)
+{
+ return 0;
+}
+#endif /* CONFIG_PCI_IOV */
+
#endif /* DRIVERS_PCI_H */
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 4b12b58..18ce9c0 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -779,6 +779,7 @@ 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);
}

/**
@@ -962,6 +963,9 @@ 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 80d88f8..77af7e0 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -87,6 +87,12 @@ enum {
/* #6: expansion ROM */
PCI_ROM_RESOURCE,

+ /* device specific resources */
+#ifdef CONFIG_PCI_IOV
+ PCI_IOV_RESOURCES,
+ PCI_IOV_RESOURCES_END = PCI_IOV_RESOURCES + PCI_IOV_NUM_BAR - 1,
+#endif
+
/* address space assigned to buses behind the bridge */
#ifndef PCI_BRIDGE_RES_NUM
#define PCI_BRIDGE_RES_NUM 4
@@ -165,6 +171,7 @@ 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.
@@ -253,6 +260,7 @@ 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);
@@ -1147,5 +1155,36 @@ static inline void * pci_ioremap_bar(struct pci_dev *pdev, int bar)
}
#endif

+/* SR-IOV events masks */
+#define PCI_IOV_NUM_VIRTFN 0x0000FFFFU /* NumVFs to be set */
+/* SR-IOV events values */
+#define PCI_IOV_ENABLE 0x00010000U /* SR-IOV enable request */
+#define PCI_IOV_DISABLE 0x00020000U /* SR-IOV disable request */
+#define PCI_IOV_NUMVFS 0x00040000U /* SR-IOV disable request */
+
+#ifdef CONFIG_PCI_IOV
+extern int pci_iov_enable(struct pci_dev *dev, int numvfs);
+extern void pci_iov_disable(struct pci_dev *dev);
+extern int pci_iov_register(struct pci_dev *dev,
+ int (*callback)(struct pci_dev *dev, u32 event));
+extern void pci_iov_unregister(struct pci_dev *dev);
+#else
+static inline int pci_iov_enable(struct pci_dev *dev, int numvfs)
+{
+ return -EIO;
+}
+static inline void pci_iov_disable(struct pci_dev *dev)
+{
+}
+static inline int pci_iov_register(struct pci_dev *dev,
+ int (*callback)(struct pci_dev *dev, u32 event))
+{
+ return -EIO;
+}
+static inline void pci_iov_unregister(struct pci_dev *dev)
+{
+}
+#endif /* CONFIG_PCI_IOV */
+
#endif /* __KERNEL__ */
#endif /* LINUX_PCI_H */
diff --git a/include/linux/pci_regs.h b/include/linux/pci_regs.h
index eb6686b..1b28b3f 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 */
@@ -434,6 +435,7 @@
#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 */
@@ -551,4 +553,23 @@
#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


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