Hi Keir,
There are some native kernel SR-IOV patches that would be accepted by
the maintainer soon, and I planed to backport them to Xen/Dom0 then.
However, it looks they can't be in the native kernel tree before the
code freeze. I attached the backported patches, if it's possible, can
you please take them for 3.4?
Thanks,
Yu
Keir Fraser wrote:
Folks,
My plan is to take no further large feature patchsets into xen-unstable until 3.4 is
branched, the only exception possibly being Dan’s tmem patches. Furthermore, after
Friday I’m away for a week and when I get back I intend to shake the trees into better
shape and accept bug-fix patches only.
-- Keir
# HG changeset patch
# User Yu Zhao <yu.zhao@xxxxxxxxx>
# Date 1237366099 14400
# Node ID cdf29bb6c74d5e075099855e9ddffb27e633079a
# Parent 9fc957e63f8dc0fdb2400eb424da4c1122b7ac65
Xen: use proper device ID to search VT-d unit for ARI and SR-IOV device
PCIe Alternative Routing-ID Interpretation (ARI) ECN defines the Extended
Function -- a function whose function number is greater than 7 within an
ARI Device. Intel VT-d spec 1.2 section 8.3.2 specifies that the Extended
Function is under the scope of the same remapping unit as the traditional
function. The hypervisor needs to know if a function is Extended Function
so it can find proper DMAR for it.
And section 8.3.3 specifies that the SR-IOV Virtual Function is under the
scope of the same remapping unit as the Physical Function. The hypervisor
also needs to know if a function is the Virtual Function and which Physical
Function it's associated with for same reason.
diff -r 9fc957e63f8d -r cdf29bb6c74d xen/arch/ia64/xen/hypercall.c
--- a/xen/arch/ia64/xen/hypercall.c Tue Mar 17 15:40:25 2009 +0000
+++ b/xen/arch/ia64/xen/hypercall.c Wed Mar 18 04:48:19 2009 -0400
@@ -650,6 +650,7 @@
case PHYSDEVOP_manage_pci_add: {
struct physdev_manage_pci manage_pci;
+ struct pci_dev dev;
ret = -EPERM;
if ( !IS_PRIV(current->domain) )
break;
@@ -657,7 +658,13 @@
if ( copy_from_guest(&manage_pci, arg, 1) != 0 )
break;
- ret = pci_add_device(manage_pci.bus, manage_pci.devfn);
+ dev.bus = manage_pci.bus;
+ dev.devfn = manage_pci.devfn;
+ dev.is_extfn = manage_pci.is_extfn;
+ dev.is_virtfn = manage_pci.is_virtfn;
+ dev.physfn.bus = manage_pci.physfn.bus;
+ dev.physfn.devfn = manage_pci.physfn.devfn;
+ ret = pci_add_device(&dev);
break;
}
diff -r 9fc957e63f8d -r cdf29bb6c74d xen/arch/x86/physdev.c
--- a/xen/arch/x86/physdev.c Tue Mar 17 15:40:25 2009 +0000
+++ b/xen/arch/x86/physdev.c Wed Mar 18 04:48:19 2009 -0400
@@ -397,6 +397,7 @@
case PHYSDEVOP_manage_pci_add: {
struct physdev_manage_pci manage_pci;
+ struct pci_dev dev;
ret = -EPERM;
if ( !IS_PRIV(v->domain) )
break;
@@ -404,7 +405,13 @@
if ( copy_from_guest(&manage_pci, arg, 1) != 0 )
break;
- ret = pci_add_device(manage_pci.bus, manage_pci.devfn);
+ dev.bus = manage_pci.bus;
+ dev.devfn = manage_pci.devfn;
+ dev.is_extfn = manage_pci.is_extfn;
+ dev.is_virtfn = manage_pci.is_virtfn;
+ dev.physfn.bus = manage_pci.physfn.bus;
+ dev.physfn.devfn = manage_pci.physfn.devfn;
+ ret = pci_add_device(&dev);
break;
}
diff -r 9fc957e63f8d -r cdf29bb6c74d xen/drivers/passthrough/pci.c
--- a/xen/drivers/passthrough/pci.c Tue Mar 17 15:40:25 2009 +0000
+++ b/xen/drivers/passthrough/pci.c Wed Mar 18 04:48:19 2009 -0400
@@ -43,8 +43,8 @@
return NULL;
memset(pdev, 0, sizeof(struct pci_dev));
- *((u8*) &pdev->bus) = bus;
- *((u8*) &pdev->devfn) = devfn;
+ pdev->bus = bus;
+ pdev->devfn = devfn;
pdev->domain = NULL;
INIT_LIST_HEAD(&pdev->msi_list);
list_add(&pdev->alldevs_list, &alldevs_list);
@@ -92,15 +92,20 @@
return NULL;
}
-int pci_add_device(u8 bus, u8 devfn)
+int pci_add_device(struct pci_dev *dev)
{
struct pci_dev *pdev;
int ret = -ENOMEM;
spin_lock(&pcidevs_lock);
- pdev = alloc_pdev(bus, devfn);
+ pdev = alloc_pdev(dev->bus, dev->devfn);
if ( !pdev )
goto out;
+
+ pdev->is_extfn = dev->is_extfn;
+ pdev->is_virtfn = dev->is_virtfn;
+ pdev->physfn.bus = dev->physfn.bus;
+ pdev->physfn.devfn = dev->physfn.devfn;
ret = 0;
if ( !pdev->domain )
@@ -115,8 +120,8 @@
out:
spin_unlock(&pcidevs_lock);
- printk(XENLOG_DEBUG "PCI add device %02x:%02x.%x\n", bus,
- PCI_SLOT(devfn), PCI_FUNC(devfn));
+ printk(XENLOG_DEBUG "PCI add device %02x:%02x.%x\n", dev->bus,
+ PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
return ret;
}
diff -r 9fc957e63f8d -r cdf29bb6c74d xen/drivers/passthrough/vtd/dmar.c
--- a/xen/drivers/passthrough/vtd/dmar.c Tue Mar 17 15:40:25 2009 +0000
+++ b/xen/drivers/passthrough/vtd/dmar.c Wed Mar 18 04:48:19 2009 -0400
@@ -157,6 +157,17 @@
struct acpi_drhd_unit *drhd;
struct acpi_drhd_unit *found = NULL, *include_all = NULL;
int i;
+ struct pci_dev *dev;
+
+ dev = pci_get_pdev(bus, devfn);
+ BUG_ON(!dev);
+
+ if (dev->is_extfn) {
+ devfn = 0;
+ } else if (dev->is_virtfn) {
+ bus = dev->physfn.bus;
+ devfn = PCI_SLOT(dev->physfn.devfn) ? 0 : dev->physfn.devfn;
+ }
list_for_each_entry ( drhd, &acpi_drhd_units, list )
{
diff -r 9fc957e63f8d -r cdf29bb6c74d xen/include/public/physdev.h
--- a/xen/include/public/physdev.h Tue Mar 17 15:40:25 2009 +0000
+++ b/xen/include/public/physdev.h Wed Mar 18 04:48:19 2009 -0400
@@ -178,6 +178,12 @@
/* IN */
uint8_t bus;
uint8_t devfn;
+ unsigned is_extfn:1;
+ unsigned is_virtfn:1;
+ struct {
+ uint8_t bus;
+ uint8_t devfn;
+ } physfn;
};
typedef struct physdev_manage_pci physdev_manage_pci_t;
diff -r 9fc957e63f8d -r cdf29bb6c74d xen/include/xen/pci.h
--- a/xen/include/xen/pci.h Tue Mar 17 15:40:25 2009 +0000
+++ b/xen/include/xen/pci.h Wed Mar 18 04:48:19 2009 -0400
@@ -41,8 +41,14 @@
spinlock_t msix_table_lock;
struct domain *domain;
- const u8 bus;
- const u8 devfn;
+ u8 bus;
+ u8 devfn;
+ unsigned is_extfn:1;
+ unsigned is_virtfn:1;
+ struct {
+ u8 bus;
+ u8 devfn;
+ } physfn;
};
#define for_each_pdev(domain, pdev) \
@@ -62,7 +68,7 @@
struct pci_dev *pci_lock_domain_pdev(struct domain *d, int bus, int devfn);
void pci_release_devices(struct domain *d);
-int pci_add_device(u8 bus, u8 devfn);
+int pci_add_device(struct pci_dev *dev);
int pci_remove_device(u8 bus, u8 devfn);
struct pci_dev *pci_get_pdev(int bus, int devfn);
struct pci_dev *pci_get_pdev_by_domain(struct domain *d, int bus, int devfn);
# HG changeset patch
# User Yu Zhao <yu.zhao@xxxxxxxxx>
# Date 1237268585 14400
# Node ID 92730fa710446b2502809faa72bb29fda95ba878
# Parent e8a9f8910a3f113759906e493eaa211e2c43cd85
PCI: initialize and release SR-IOV capability
If a device has the SR-IOV capability, initialize it (set the ARI
Capable Hierarchy in the lowest numbered PF if necessary; calculate
the System Page Size for the VF MMIO, probe the VF Offset, Stride
and BARs). A lock for the VF bus allocation is also initialized if
a PF is the lowest numbered PF.
Signed-off-by: Yu Zhao <yu.zhao@xxxxxxxxx>
diff -r e8a9f8910a3f -r 92730fa71044 drivers/pci/Kconfig
--- a/drivers/pci/Kconfig Fri Mar 13 10:08:22 2009 +0000
+++ b/drivers/pci/Kconfig Tue Mar 17 01:43:05 2009 -0400
@@ -37,3 +37,12 @@
help
Say Y here if you want to reserve PCI device for passthrough.
+config PCI_IOV
+ bool "PCI IOV support"
+ depends on PCI
+ help
+ PCI-SIG I/O Virtualization (IOV) Specifications support.
+ Single Root IOV: allows the creation of virtual PCI devices
+ that share the physical resources from a real device.
+
+ When in doubt, say N.
diff -r e8a9f8910a3f -r 92730fa71044 drivers/pci/Makefile
--- a/drivers/pci/Makefile Fri Mar 13 10:08:22 2009 +0000
+++ b/drivers/pci/Makefile Tue Mar 17 01:43:05 2009 -0400
@@ -15,6 +15,8 @@
# Build the PCI Hotplug drivers if we were asked to
obj-$(CONFIG_HOTPLUG_PCI) += hotplug/
+
+obj-$(CONFIG_PCI_IOV) += iov.o
#
# Some architectures use the generic PCI setup functions
diff -r e8a9f8910a3f -r 92730fa71044 drivers/pci/iov.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/drivers/pci/iov.c Tue Mar 17 01:43:05 2009 -0400
@@ -0,0 +1,175 @@
+/*
+ * drivers/pci/iov.c
+ *
+ * Copyright (C) 2009 Intel Corporation, Yu Zhao <yu.zhao@xxxxxxxxx>
+ *
+ * PCI Express I/O Virtualization (IOV) support.
+ * Single Root IOV 1.0
+ */
+
+#include <linux/pci.h>
+#include <linux/mutex.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include "pci.h"
+
+
+static int sriov_init(struct pci_dev *dev, int pos)
+{
+ int i;
+ int rc;
+ int nres;
+ u32 pgsz;
+ u16 ctrl, total, offset, stride;
+ struct pci_sriov *iov;
+ struct resource *res;
+ struct pci_dev *pdev;
+
+ pci_read_config_word(dev, pos + PCI_SRIOV_CTRL, &ctrl);
+ if (ctrl & PCI_SRIOV_CTRL_VFE) {
+ pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, 0);
+ ssleep(1);
+ }
+
+ pci_read_config_word(dev, pos + PCI_SRIOV_TOTAL_VF, &total);
+ if (!total)
+ return 0;
+
+ list_for_each_entry(pdev, &dev->bus->devices, bus_list)
+ if (pdev->is_physfn)
+ break;
+ if (list_empty(&dev->bus->devices) || !pdev->is_physfn)
+ pdev = NULL;
+
+ ctrl = 0;
+ if (!pdev && pci_ari_enabled(dev->bus))
+ ctrl |= PCI_SRIOV_CTRL_ARI;
+
+ pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, ctrl);
+ pci_write_config_word(dev, pos + PCI_SRIOV_NUM_VF, total);
+ pci_read_config_word(dev, pos + PCI_SRIOV_VF_OFFSET, &offset);
+ pci_read_config_word(dev, pos + PCI_SRIOV_VF_STRIDE, &stride);
+ if (!offset || (total > 1 && !stride))
+ 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);
+
+ nres = 0;
+ for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
+ res = dev->resource + PCI_IOV_RESOURCES + i;
+ i += __pci_read_base(dev, pci_bar_unknown, res,
+ pos + PCI_SRIOV_BAR + i * 4);
+ if (!res->flags)
+ continue;
+ if ((res->end - res->start + 1) & (PAGE_SIZE - 1)) {
+ rc = -EIO;
+ goto failed;
+ }
+ res->end = res->start + (res->end - res->start + 1) * 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 (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)
+{
+ if (dev == dev->sriov->dev)
+ mutex_destroy(&dev->sriov->lock);
+ else
+ pci_dev_put(dev->sriov->dev);
+
+ kfree(dev->sriov);
+ dev->sriov = NULL;
+}
+
+/**
+ * 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;
+
+ 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);
+}
diff -r e8a9f8910a3f -r 92730fa71044 drivers/pci/pci.c
--- a/drivers/pci/pci.c Fri Mar 13 10:08:22 2009 +0000
+++ b/drivers/pci/pci.c Tue Mar 17 01:43:05 2009 -0400
@@ -1048,12 +1048,19 @@
*/
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 -r e8a9f8910a3f -r 92730fa71044 drivers/pci/pci.h
--- a/drivers/pci/pci.h Fri Mar 13 10:08:22 2009 +0000
+++ b/drivers/pci/pci.h Tue Mar 17 01:43:05 2009 -0400
@@ -132,3 +132,40 @@
{
return bus->self && bus->self->ari_enabled;
}
+
+/* Single Root I/O Virtualization */
+struct pci_sriov {
+ int pos; /* capability position */
+ int nres; /* number of resources */
+ u32 cap; /* SR-IOV Capabilities */
+ u16 ctrl; /* SR-IOV Control */
+ u16 total; /* total VFs associated with the PF */
+ u16 offset; /* first VF Routing ID offset */
+ u16 stride; /* following VF stride */
+ u32 pgsz; /* page size for BAR alignment */
+ u8 link; /* Function Dependency Link */
+ struct pci_dev *dev; /* lowest numbered PF */
+ struct pci_dev *self; /* this 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);
+#else
+static inline int pci_iov_init(struct pci_dev *dev)
+{
+ return -ENODEV;
+}
+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;
+}
+#endif /* CONFIG_PCI_IOV */
diff -r e8a9f8910a3f -r 92730fa71044 drivers/pci/probe.c
--- a/drivers/pci/probe.c Fri Mar 13 10:08:22 2009 +0000
+++ b/drivers/pci/probe.c Tue Mar 17 01:43:05 2009 -0400
@@ -765,6 +765,9 @@
struct pci_dev *pci_dev;
pci_dev = to_pci_dev(dev);
+
+ pci_iov_release(pci_dev);
+
kfree(pci_dev);
}
@@ -891,6 +894,9 @@
/* Alternative Routing-ID Forwarding */
pci_enable_ari(dev);
+
+ /* Single Root I/O Virtualization */
+ pci_iov_init(dev);
/*
* Add the device to our list of discovered devices
diff -r e8a9f8910a3f -r 92730fa71044 include/linux/pci.h
--- a/include/linux/pci.h Fri Mar 13 10:08:22 2009 +0000
+++ b/include/linux/pci.h Tue Mar 17 01:43:05 2009 -0400
@@ -77,6 +77,12 @@
/* #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_SRIOV_NUM_BARS - 1,
+#endif
+
/* resources assigned to buses behind the bridge */
#define PCI_BRIDGE_RESOURCE_NUM 4
@@ -127,6 +133,8 @@
char cap_nr;
u32 data[0];
};
+
+struct pci_sriov;
/*
* The pci_dev structure is used to describe PCI devices.
@@ -189,13 +197,17 @@
unsigned int broken_parity_status:1; /* Device generates false
positive parity */
unsigned int msi_enabled:1;
unsigned int msix_enabled:1;
+ unsigned int ari_enabled:1; /* ARI forwarding */
+ unsigned int is_physfn:1;
u32 saved_config_space[16]; /* config space saved at
suspend time */
struct hlist_head saved_cap_space;
struct bin_attribute *rom_attr; /* attribute descriptor for sysfs ROM
entry */
int rom_attr_enabled; /* has display of the rom attribute
been enabled? */
struct bin_attribute *res_attr[DEVICE_COUNT_RESOURCE]; /* sysfs file
for resources */
- unsigned int ari_enabled:1; /* ARI forwarding */
+#ifdef CONFIG_PCI_IOV
+ struct pci_sriov *sriov; /* SR-IOV capability related */
+#endif
};
#define pci_dev_g(n) list_entry(n, struct pci_dev, global_list)
diff -r e8a9f8910a3f -r 92730fa71044 include/linux/pci_regs.h
--- a/include/linux/pci_regs.h Fri Mar 13 10:08:22 2009 +0000
+++ b/include/linux/pci_regs.h Tue Mar 17 01:43:05 2009 -0400
@@ -332,6 +332,7 @@
#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 */
@@ -393,6 +394,7 @@
#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_SRIOV 16
/* Advanced Error Reporting */
#define PCI_ERR_UNCOR_STATUS 4 /* Uncorrectable Error Status */
@@ -478,4 +480,35 @@
#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_SRIOV_CAP 0x04 /* SR-IOV Capabilities */
+#define PCI_SRIOV_CAP_VFM 0x01 /* VF Migration Capable */
+#define PCI_SRIOV_CAP_INTR(x) ((x) >> 21) /* Interrupt Message Number */
+#define PCI_SRIOV_CTRL 0x08 /* SR-IOV Control */
+#define PCI_SRIOV_CTRL_VFE 0x01 /* VF Enable */
+#define PCI_SRIOV_CTRL_VFM 0x02 /* VF Migration Enable */
+#define PCI_SRIOV_CTRL_INTR 0x04 /* VF Migration Interrupt Enable */
+#define PCI_SRIOV_CTRL_MSE 0x08 /* VF Memory Space Enable */
+#define PCI_SRIOV_CTRL_ARI 0x10 /* ARI Capable Hierarchy */
+#define PCI_SRIOV_STATUS 0x0a /* SR-IOV Status */
+#define PCI_SRIOV_STATUS_VFM 0x01 /* VF Migration Status */
+#define PCI_SRIOV_INITIAL_VF 0x0c /* Initial VFs */
+#define PCI_SRIOV_TOTAL_VF 0x0e /* Total VFs */
+#define PCI_SRIOV_NUM_VF 0x10 /* Number of VFs */
+#define PCI_SRIOV_FUNC_LINK 0x12 /* Function Dependency Link */
+#define PCI_SRIOV_VF_OFFSET 0x14 /* First VF Offset */
+#define PCI_SRIOV_VF_STRIDE 0x16 /* Following VF Stride */
+#define PCI_SRIOV_VF_DID 0x1a /* VF Device ID */
+#define PCI_SRIOV_SUP_PGSIZE 0x1c /* Supported Page Sizes */
+#define PCI_SRIOV_SYS_PGSIZE 0x20 /* System Page Size */
+#define PCI_SRIOV_BAR 0x24 /* VF BAR0 */
+#define PCI_SRIOV_NUM_BARS 6 /* Number of VF BARs */
+#define PCI_SRIOV_VFM 0x3c /* VF Migration State Array Offset*/
+#define PCI_SRIOV_VFM_BIR(x) ((x) & 7) /* State BIR */
+#define PCI_SRIOV_VFM_OFFSET(x) ((x) & ~7) /* State Offset */
+#define PCI_SRIOV_VFM_UA 0x0 /* Inactive.Unavailable */
+#define PCI_SRIOV_VFM_MI 0x1 /* Dormant.MigrateIn */
+#define PCI_SRIOV_VFM_MO 0x2 /* Active.MigrateOut */
+#define PCI_SRIOV_VFM_AV 0x3 /* Active.Available */
+
#endif /* LINUX_PCI_REGS_H */
# HG changeset patch
# User Yu Zhao <yu.zhao@xxxxxxxxx>
# Date 1237268742 14400
# Node ID 2629935bf356bb7118f8691a46e90daed77c3b48
# Parent 92730fa710446b2502809faa72bb29fda95ba878
PCI: restore saved SR-IOV state
Restore the volatile registers in the SR-IOV capability after the
D3->D0 transition.
Signed-off-by: Yu Zhao <yu.zhao@xxxxxxxxx>
diff -r 92730fa71044 -r 2629935bf356 drivers/pci/iov.c
--- a/drivers/pci/iov.c Tue Mar 17 01:43:05 2009 -0400
+++ b/drivers/pci/iov.c Tue Mar 17 01:45:42 2009 -0400
@@ -125,6 +125,25 @@
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_CTRL, iov->ctrl);
+ if (iov->ctrl & PCI_SRIOV_CTRL_VFE)
+ msleep(100);
+}
+
/**
* pci_iov_init - initialize the IOV capability
* @dev: the PCI device
@@ -173,3 +192,13 @@
return dev->sriov->pos + PCI_SRIOV_BAR +
4 * (resno - PCI_IOV_RESOURCES);
}
+
+/**
+ * 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);
+}
diff -r 92730fa71044 -r 2629935bf356 drivers/pci/pci.c
--- a/drivers/pci/pci.c Tue Mar 17 01:43:05 2009 -0400
+++ b/drivers/pci/pci.c Tue Mar 17 01:45:42 2009 -0400
@@ -562,6 +562,8 @@
pci_restore_pcix_state(dev);
pci_restore_msi_state(dev);
pci_restore_msix_state(dev);
+ pci_restore_iov_state(dev);
+
return 0;
}
diff -r 92730fa71044 -r 2629935bf356 drivers/pci/pci.h
--- a/drivers/pci/pci.h Tue Mar 17 01:43:05 2009 -0400
+++ b/drivers/pci/pci.h Tue Mar 17 01:45:42 2009 -0400
@@ -154,6 +154,7 @@
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 void pci_restore_iov_state(struct pci_dev *dev);
#else
static inline int pci_iov_init(struct pci_dev *dev)
{
@@ -168,4 +169,7 @@
{
return 0;
}
+static inline void pci_restore_iov_state(struct pci_dev *dev)
+{
+}
#endif /* CONFIG_PCI_IOV */
# HG changeset patch
# User Yu Zhao <yu.zhao@xxxxxxxxx>
# Date 1237268873 14400
# Node ID 6b776c705e444562dda66dc0b33fd80eaceb1bfb
# Parent 2629935bf356bb7118f8691a46e90daed77c3b48
PCI: reserve bus range for SR-IOV device
Reserve the bus number range used by the Virtual Function when
pcibios_assign_all_busses() returns true.
Signed-off-by: Yu Zhao <yu.zhao@xxxxxxxxx>
diff -r 2629935bf356 -r 6b776c705e44 drivers/pci/iov.c
--- a/drivers/pci/iov.c Tue Mar 17 01:45:42 2009 -0400
+++ b/drivers/pci/iov.c Tue Mar 17 01:47:53 2009 -0400
@@ -13,6 +13,18 @@
#include <linux/delay.h>
#include "pci.h"
+
+static inline u8 virtfn_bus(struct pci_dev *dev, int id)
+{
+ return dev->bus->number + ((dev->devfn + dev->sriov->offset +
+ dev->sriov->stride * id) >> 8);
+}
+
+static inline u8 virtfn_devfn(struct pci_dev *dev, int id)
+{
+ return (dev->devfn + dev->sriov->offset +
+ dev->sriov->stride * id) & 0xff;
+}
static int sriov_init(struct pci_dev *dev, int pos)
{
@@ -202,3 +214,27 @@
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;
+}
diff -r 2629935bf356 -r 6b776c705e44 drivers/pci/pci.h
--- a/drivers/pci/pci.h Tue Mar 17 01:45:42 2009 -0400
+++ b/drivers/pci/pci.h Tue Mar 17 01:47:53 2009 -0400
@@ -155,6 +155,7 @@
extern int pci_iov_resource_bar(struct pci_dev *dev, int resno,
enum pci_bar_type *type);
extern void pci_restore_iov_state(struct pci_dev *dev);
+extern int pci_iov_bus_range(struct pci_bus *bus);
#else
static inline int pci_iov_init(struct pci_dev *dev)
{
@@ -172,4 +173,8 @@
static inline void pci_restore_iov_state(struct pci_dev *dev)
{
}
+static inline int pci_iov_bus_range(struct pci_bus *bus)
+{
+ return 0;
+}
#endif /* CONFIG_PCI_IOV */
diff -r 2629935bf356 -r 6b776c705e44 drivers/pci/probe.c
--- a/drivers/pci/probe.c Tue Mar 17 01:45:42 2009 -0400
+++ b/drivers/pci/probe.c Tue Mar 17 01:47:53 2009 -0400
@@ -976,6 +976,9 @@
for (devfn = 0; devfn < 0x100; devfn += 8)
pci_scan_slot(bus, devfn);
+ /* Reserve buses for SR-IOV capability. */
+ max += pci_iov_bus_range(bus);
+
/*
* After performing arch-dependent fixup of the bus, look behind
* all PCI-to-PCI bridges on this bus.
# HG changeset patch
# User Yu Zhao <yu.zhao@xxxxxxxxx>
# Date 1237270918 14400
# Node ID 3a2d0f486f533f0ef21267b9a1682997e0caf463
# Parent 6b776c705e444562dda66dc0b33fd80eaceb1bfb
PCI: centralize device setup code
Move the device setup stuff into pci_setup_device() which will be used
to setup the Virtual Function later.
Signed-off-by: Yu Zhao <yu.zhao@xxxxxxxxx>
diff -r 6b776c705e44 -r 3a2d0f486f53 drivers/pci/pci.h
--- a/drivers/pci/pci.h Tue Mar 17 01:47:53 2009 -0400
+++ b/drivers/pci/pci.h Tue Mar 17 02:21:58 2009 -0400
@@ -117,6 +117,7 @@
pci_bar_mem64, /* A 64-bit memory BAR */
};
+extern int pci_setup_device(struct pci_dev *dev);
extern int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
struct resource *res, unsigned int reg);
extern int pci_resource_bar(struct pci_dev *dev, int resno,
diff -r 6b776c705e44 -r 3a2d0f486f53 drivers/pci/probe.c
--- a/drivers/pci/probe.c Tue Mar 17 01:47:53 2009 -0400
+++ b/drivers/pci/probe.c Tue Mar 17 02:21:58 2009 -0400
@@ -683,13 +683,28 @@
* Initialize the device structure with information about the device's
* vendor,class,memory and IO-space addresses,IRQ lines etc.
* Called at initialisation of the PCI subsystem and by CardBus services.
- * Returns 0 on success and -1 if unknown type of device (not normal, bridge
- * or CardBus).
+ * Returns 0 on success and negative if unknown type of device (not normal,
+ * bridge or CardBus).
*/
-static int pci_setup_device(struct pci_dev * dev)
+int pci_setup_device(struct pci_dev *dev)
{
u32 class;
+ u8 hdr_type;
+ if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type))
+ return -EIO;
+
+ dev->sysdata = dev->bus->sysdata;
+ dev->dev.parent = dev->bus->bridge;
+ dev->dev.bus = &pci_bus_type;
+ dev->hdr_type = hdr_type & 0x7f;
+ dev->multifunction = !!(hdr_type & 0x80);
+ dev->cfg_size = pci_cfg_space_size(dev);
+ dev->error_state = pci_channel_io_normal;
+
+ /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
+ set this higher, assuming the system even supports it. */
+ dev->dma_mask = 0xffffffff;
sprintf(pci_name(dev), "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
@@ -706,7 +721,6 @@
/* Early fixups, before probing the BARs */
pci_fixup_device(pci_fixup_early, dev);
- class = dev->class >> 8;
switch (dev->hdr_type) { /* header type */
case PCI_HEADER_TYPE_NORMAL: /* standard header */
@@ -741,7 +755,7 @@
default: /* unknown header */
printk(KERN_ERR "PCI: device %s has unknown header type %02x,
ignoring.\n",
pci_name(dev), dev->hdr_type);
- return -1;
+ return -EIO;
bad:
printk(KERN_ERR "PCI: %s: class %x doesn't match header type
%02x. Ignoring class.\n",
@@ -823,7 +837,6 @@
{
struct pci_dev *dev;
u32 l;
- u8 hdr_type;
int delay = 1;
if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
@@ -850,29 +863,16 @@
}
}
- if (pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type))
- return NULL;
-
dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
if (!dev)
return NULL;
dev->bus = bus;
- dev->sysdata = bus->sysdata;
- dev->dev.parent = bus->bridge;
- dev->dev.bus = &pci_bus_type;
dev->devfn = devfn;
- dev->hdr_type = hdr_type & 0x7f;
- dev->multifunction = !!(hdr_type & 0x80);
dev->vendor = l & 0xffff;
dev->device = (l >> 16) & 0xffff;
- dev->cfg_size = pci_cfg_space_size(dev);
- dev->error_state = pci_channel_io_normal;
- /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
- set this higher, assuming the system even supports it. */
- dev->dma_mask = 0xffffffff;
- if (pci_setup_device(dev) < 0) {
+ if (pci_setup_device(dev)) {
kfree(dev);
return NULL;
}
# HG changeset patch
# User Yu Zhao <yu.zhao@xxxxxxxxx>
# Date 1237270982 14400
# Node ID 577169901110eb89ff36f1460e152a5c96297bde
# Parent 3a2d0f486f533f0ef21267b9a1682997e0caf463
PCI: add SR-IOV API for Physical Function driver
Add or remove the Virtual Function when the SR-IOV is enabled or
disabled by the device driver. This can happen anytime rather than
only at the device probe stage.
Signed-off-by: Yu Zhao <yu.zhao@xxxxxxxxx>
diff -r 3a2d0f486f53 -r 577169901110 drivers/pci/iov.c
--- a/drivers/pci/iov.c Tue Mar 17 02:21:58 2009 -0400
+++ b/drivers/pci/iov.c Tue Mar 17 02:23:02 2009 -0400
@@ -13,6 +13,7 @@
#include <linux/delay.h>
#include "pci.h"
+#define VIRTFN_ID_LEN 16
static inline u8 virtfn_bus(struct pci_dev *dev, int id)
{
@@ -24,6 +25,267 @@
{
return (dev->devfn + dev->sriov->offset +
dev->sriov->stride * id) & 0xff;
+}
+
+static struct pci_bus *virtfn_add_bus(struct pci_bus *bus, int busnr)
+{
+ struct pci_bus *child;
+
+ if (bus->number == busnr)
+ return bus;
+
+ child = pci_find_bus(pci_domain_nr(bus), busnr);
+ if (child)
+ return child;
+
+ child = pci_add_new_bus(bus, NULL, busnr);
+ if (!child)
+ return NULL;
+
+ child->subordinate = busnr;
+
+ return child;
+}
+
+static void virtfn_remove_bus(struct pci_bus *bus, int busnr)
+{
+ struct pci_bus *child;
+
+ if (bus->number == busnr)
+ return;
+
+ child = pci_find_bus(pci_domain_nr(bus), busnr);
+ BUG_ON(!child);
+
+ if (list_empty(&child->devices))
+ pci_remove_bus(child);
+}
+
+static int virtfn_add(struct pci_dev *dev, int id)
+{
+ int i;
+ int rc;
+ u64 size;
+ char buf[VIRTFN_ID_LEN];
+ struct pci_dev *virtfn;
+ struct resource *res;
+ struct pci_sriov *iov = dev->sriov;
+
+ virtfn = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
+ if (!virtfn)
+ return -ENOMEM;
+
+ mutex_lock(&iov->dev->sriov->lock);
+ virtfn->bus = virtfn_add_bus(dev->bus, virtfn_bus(dev, id));
+ if (!virtfn->bus) {
+ kfree(virtfn);
+ mutex_unlock(&iov->dev->sriov->lock);
+ return -ENOMEM;
+ }
+ virtfn->devfn = virtfn_devfn(dev, id);
+ virtfn->vendor = dev->vendor;
+ pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_DID, &virtfn->device);
+ pci_setup_device(virtfn);
+ virtfn->dev.parent = dev->dev.parent;
+
+ for (i = 0; i < PCI_SRIOV_NUM_BARS; 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 = res->end - res->start + 1;
+ do_div(size, 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);
+ }
+
+ pci_device_add(virtfn, virtfn->bus);
+ mutex_unlock(&iov->dev->sriov->lock);
+
+ virtfn->physfn = pci_dev_get(dev);
+ virtfn->is_virtfn = 1;
+
+ pci_bus_add_device(virtfn);
+ sprintf(buf, "virtfn%u", id);
+ rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf);
+ if (rc)
+ goto failed1;
+ rc = sysfs_create_link(&virtfn->dev.kobj, &dev->dev.kobj, "physfn");
+ if (rc)
+ goto failed2;
+
+ kobject_uevent(&virtfn->dev.kobj, KOBJ_CHANGE);
+
+ return 0;
+
+failed2:
+ sysfs_remove_link(&dev->dev.kobj, buf);
+failed1:
+ pci_dev_put(dev);
+ mutex_lock(&iov->dev->sriov->lock);
+ pci_remove_bus_device(virtfn);
+ virtfn_remove_bus(dev->bus, virtfn_bus(dev, id));
+ mutex_unlock(&iov->dev->sriov->lock);
+
+ return rc;
+}
+
+static void virtfn_remove(struct pci_dev *dev, int id)
+{
+ char buf[VIRTFN_ID_LEN];
+ struct pci_bus *bus;
+ struct pci_dev *virtfn;
+ struct pci_sriov *iov = dev->sriov;
+
+ bus = pci_find_bus(pci_domain_nr(dev->bus), virtfn_bus(dev, id));
+ if (!bus)
+ return;
+
+ virtfn = pci_get_slot(bus, virtfn_devfn(dev, id));
+ if (!virtfn)
+ return;
+
+ pci_dev_put(virtfn);
+
+ sprintf(buf, "virtfn%u", id);
+ sysfs_remove_link(&dev->dev.kobj, buf);
+ sysfs_remove_link(&virtfn->dev.kobj, "physfn");
+
+ mutex_lock(&iov->dev->sriov->lock);
+ pci_remove_bus_device(virtfn);
+ virtfn_remove_bus(dev->bus, virtfn_bus(dev, id));
+ mutex_unlock(&iov->dev->sriov->lock);
+
+ pci_dev_put(dev);
+}
+
+static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
+{
+ int rc;
+ int i, j;
+ int nres;
+ u16 offset, stride, initial;
+ struct resource *res;
+ struct pci_dev *pdev;
+ struct pci_sriov *iov = dev->sriov;
+
+ if (!nr_virtfn)
+ return 0;
+
+ if (iov->nr_virtfn)
+ return -EINVAL;
+
+ pci_read_config_word(dev, iov->pos + PCI_SRIOV_INITIAL_VF, &initial);
+ if (initial > iov->total ||
+ (!(iov->cap & PCI_SRIOV_CAP_VFM) && (initial != iov->total)))
+ return -EIO;
+
+ if (nr_virtfn < 0 || nr_virtfn > iov->total ||
+ (!(iov->cap & PCI_SRIOV_CAP_VFM) && (nr_virtfn > initial)))
+ return -EINVAL;
+
+ pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, nr_virtfn);
+ pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_OFFSET, &offset);
+ pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_STRIDE, &stride);
+ if (!offset || (nr_virtfn > 1 && !stride))
+ return -EIO;
+
+ nres = 0;
+ for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
+ res = dev->resource + PCI_IOV_RESOURCES + i;
+ if (res->parent)
+ nres++;
+ }
+ if (nres != iov->nres) {
+ dev_err(&dev->dev, "not enough MMIO resources for SR-IOV\n");
+ return -ENOMEM;
+ }
+
+ iov->offset = offset;
+ iov->stride = stride;
+
+ if (virtfn_bus(dev, nr_virtfn - 1) > dev->bus->subordinate) {
+ dev_err(&dev->dev, "SR-IOV: bus number out of range\n");
+ return -ENOMEM;
+ }
+
+ if (iov->link != dev->devfn) {
+ pdev = pci_get_slot(dev->bus, iov->link);
+ if (!pdev)
+ return -ENODEV;
+
+ pci_dev_put(pdev);
+
+ if (!pdev->is_physfn)
+ return -ENODEV;
+
+ rc = sysfs_create_link(&dev->dev.kobj,
+ &pdev->dev.kobj, "dep_link");
+ if (rc)
+ return rc;
+ }
+
+ iov->ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE;
+ pci_block_user_cfg_access(dev);
+ pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
+ msleep(100);
+ pci_unblock_user_cfg_access(dev);
+
+ iov->initial = initial;
+ if (nr_virtfn < initial)
+ initial = nr_virtfn;
+
+ for (i = 0; i < initial; i++) {
+ rc = virtfn_add(dev, i);
+ if (rc)
+ goto failed;
+ }
+
+ kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE);
+ iov->nr_virtfn = nr_virtfn;
+
+ return 0;
+
+failed:
+ for (j = 0; j < i; j++)
+ virtfn_remove(dev, j);
+
+ iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
+ pci_block_user_cfg_access(dev);
+ pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
+ ssleep(1);
+ pci_unblock_user_cfg_access(dev);
+
+ if (iov->link != dev->devfn)
+ sysfs_remove_link(&dev->dev.kobj, "dep_link");
+
+ return rc;
+}
+
+static void sriov_disable(struct pci_dev *dev)
+{
+ int i;
+ struct pci_sriov *iov = dev->sriov;
+
+ if (!iov->nr_virtfn)
+ return;
+
+ for (i = 0; i < iov->nr_virtfn; i++)
+ virtfn_remove(dev, i);
+
+ iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
+ pci_block_user_cfg_access(dev);
+ pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
+ ssleep(1);
+ pci_unblock_user_cfg_access(dev);
+
+ if (iov->link != dev->devfn)
+ sysfs_remove_link(&dev->dev.kobj, "dep_link");
+
+ iov->nr_virtfn = 0;
}
static int sriov_init(struct pci_dev *dev, int pos)
@@ -128,6 +390,8 @@
static void sriov_release(struct pci_dev *dev)
{
+ BUG_ON(dev->sriov->nr_virtfn);
+
if (dev == dev->sriov->dev)
mutex_destroy(&dev->sriov->lock);
else
@@ -151,6 +415,7 @@
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);
@@ -238,3 +503,35 @@
return max ? max - bus->number : 0;
}
+
+/**
+ * pci_enable_sriov - enable the SR-IOV capability
+ * @dev: the PCI device
+ *
+ * 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);
diff -r 3a2d0f486f53 -r 577169901110 drivers/pci/pci.h
--- a/drivers/pci/pci.h Tue Mar 17 02:21:58 2009 -0400
+++ b/drivers/pci/pci.h Tue Mar 17 02:23:02 2009 -0400
@@ -141,6 +141,8 @@
u32 cap; /* SR-IOV Capabilities */
u16 ctrl; /* SR-IOV Control */
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 */
diff -r 3a2d0f486f53 -r 577169901110 include/linux/pci.h
--- a/include/linux/pci.h Tue Mar 17 02:21:58 2009 -0400
+++ b/include/linux/pci.h Tue Mar 17 02:23:02 2009 -0400
@@ -199,6 +199,7 @@
unsigned int msix_enabled:1;
unsigned int ari_enabled:1; /* ARI forwarding */
unsigned int is_physfn:1;
+ unsigned int is_virtfn:1;
u32 saved_config_space[16]; /* config space saved at
suspend time */
struct hlist_head saved_cap_space;
@@ -206,7 +207,10 @@
int rom_attr_enabled; /* has display of the rom attribute
been enabled? */
struct bin_attribute *res_attr[DEVICE_COUNT_RESOURCE]; /* sysfs file
for resources */
#ifdef CONFIG_PCI_IOV
- struct pci_sriov *sriov; /* SR-IOV capability related */
+ union {
+ struct pci_sriov *sriov; /* SR-IOV capability related */
+ struct pci_dev *physfn; /* the PF this VF is associated with */
+ };
#endif
};
@@ -829,5 +833,18 @@
int pci_is_guestdev(struct pci_dev *dev);
#endif /* CONFIG_PCI_GUESTDEV */
+#ifdef CONFIG_PCI_IOV
+extern int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn);
+extern void pci_disable_sriov(struct pci_dev *dev);
+#else
+static inline int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
+{
+ return -ENODEV;
+}
+static inline void pci_disable_sriov(struct pci_dev *dev)
+{
+}
+#endif
+
#endif /* __KERNEL__ */
#endif /* LINUX_PCI_H */
# HG changeset patch
# User Yu Zhao <yu.zhao@xxxxxxxxx>
# Date 1237353055 14400
# Node ID 582ec8e86ffff64834e8c77ef6790774352ddc7a
# Parent 577169901110eb89ff36f1460e152a5c96297bde
PCI: pass ARI and SR-IOV device information to the hypervisor
PCIe Alternative Routing-ID Interpretation (ARI) ECN defines the Extended
Function -- a function whose function number is greater than 7 within an
ARI Device. Intel VT-d spec 1.2 section 8.3.2 specifies that the Extended
Function is under the scope of the same remapping unit as the traditional
function. The hypervisor needs to know if a function is Extended Function
so it can find proper DMAR for it.
And section 8.3.3 specifies that the SR-IOV Virtual Function is under the
scope of the same remapping unit as the Physical Function. The hypervisor
also needs to know if a function is the Virtual Function and which Physical
Function it's associated with for same reason.
diff -r 577169901110 -r 582ec8e86fff drivers/xen/core/pci.c
--- a/drivers/xen/core/pci.c Tue Mar 17 02:23:02 2009 -0400
+++ b/drivers/xen/core/pci.c Wed Mar 18 01:10:55 2009 -0400
@@ -6,6 +6,7 @@
#include <linux/init.h>
#include <linux/pci.h>
#include <xen/interface/physdev.h>
+#include "../../pci/pci.h"
static int (*pci_bus_probe)(struct device *dev);
static int (*pci_bus_remove)(struct device *dev);
@@ -15,8 +16,16 @@
int r;
struct pci_dev *pci_dev = to_pci_dev(dev);
struct physdev_manage_pci manage_pci;
+
+ memset(&manage_pci, 0, sizeof(manage_pci));
manage_pci.bus = pci_dev->bus->number;
manage_pci.devfn = pci_dev->devfn;
+ if (pci_dev->is_virtfn) {
+ manage_pci.is_virtfn = 1;
+ manage_pci.physfn.bus = pci_dev->physfn->bus->number;
+ manage_pci.physfn.devfn = pci_dev->physfn->devfn;
+ } else if (pci_ari_enabled(pci_dev->bus) && PCI_SLOT(pci_dev->devfn))
+ manage_pci.is_extfn = 1;
r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_add, &manage_pci);
if (r && r != -ENOSYS)
diff -r 577169901110 -r 582ec8e86fff include/xen/interface/physdev.h
--- a/include/xen/interface/physdev.h Tue Mar 17 02:23:02 2009 -0400
+++ b/include/xen/interface/physdev.h Wed Mar 18 01:10:55 2009 -0400
@@ -178,6 +178,12 @@
/* IN */
uint8_t bus;
uint8_t devfn;
+ unsigned is_extfn:1;
+ unsigned is_virtfn:1;
+ struct {
+ uint8_t bus;
+ uint8_t devfn;
+ } physfn;
};
typedef struct physdev_manage_pci physdev_manage_pci_t;
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel
|
Home