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PCI: Remove unused SR-IOV VF Migration support 

This reverts commit 74bb1bcc7d ("PCI: handle SR-IOV Virtual Function
Migration"), removing this exported interface:

  pci_sriov_migration()

Since pci_sriov_migration() is unused, it is impossible to schedule
sriov_migration_task() or use any of the other migration infrastructure.

This is based on Stephen Hemminger's patch (see link below), but goes a bit
further.

Link: http://lkml.kernel.org/r/20131227132710.7190647c@nehalam.linuxnetplumber.net
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: Stephen Hemminger <stephen@networkplumber.org>
This commit is contained in:
Bjorn Helgaas 2014-01-30 11:28:15 -07:00
parent 4b180d97b1
commit 46cb7b1bd8
4 changed files with 0 additions and 131 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/PCI/pci-iov-howto.txt
View File

@ -68,10 +68,6 @@ To disable SR-IOV capability:
echo 0 > \ echo 0 > \
/sys/bus/pci/devices/<DOMAIN:BUS:DEVICE.FUNCTION>/sriov_numvfs /sys/bus/pci/devices/<DOMAIN:BUS:DEVICE.FUNCTION>/sriov_numvfs
To notify SR-IOV core of Virtual Function Migration:
(a) In the driver:
irqreturn_t pci_sriov_migration(struct pci_dev *dev);
3.2 Usage example 3.2 Usage example
Following piece of code illustrates the usage of the SR-IOV API. Following piece of code illustrates the usage of the SR-IOV API.

119
drivers/pci/iov.c
View File

@ -170,97 +170,6 @@ static void virtfn_remove(struct pci_dev *dev, int id, int reset)
pci_dev_put(dev); pci_dev_put(dev);
} }
static int sriov_migration(struct pci_dev *dev)
{
u16 status;
struct pci_sriov *iov = dev->sriov;
if (!iov->num_VFs)
return 0;
if (!(iov->cap & PCI_SRIOV_CAP_VFM))
return 0;
pci_read_config_word(dev, iov->pos + PCI_SRIOV_STATUS, &status);
if (!(status & PCI_SRIOV_STATUS_VFM))
return 0;
schedule_work(&iov->mtask);
return 1;
}
static void sriov_migration_task(struct work_struct *work)
{
int i;
u8 state;
u16 status;
struct pci_sriov *iov = container_of(work, struct pci_sriov, mtask);
for (i = iov->initial_VFs; i < iov->num_VFs; i++) {
state = readb(iov->mstate + i);
if (state == PCI_SRIOV_VFM_MI) {
writeb(PCI_SRIOV_VFM_AV, iov->mstate + i);
state = readb(iov->mstate + i);
if (state == PCI_SRIOV_VFM_AV)
virtfn_add(iov->self, i, 1);
} else if (state == PCI_SRIOV_VFM_MO) {
virtfn_remove(iov->self, i, 1);
writeb(PCI_SRIOV_VFM_UA, iov->mstate + i);
state = readb(iov->mstate + i);
if (state == PCI_SRIOV_VFM_AV)
virtfn_add(iov->self, i, 0);
}
}
pci_read_config_word(iov->self, iov->pos + PCI_SRIOV_STATUS, &status);
status &= ~PCI_SRIOV_STATUS_VFM;
pci_write_config_word(iov->self, iov->pos + PCI_SRIOV_STATUS, status);
}
static int sriov_enable_migration(struct pci_dev *dev, int nr_virtfn)
{
int bir;
u32 table;
resource_size_t pa;
struct pci_sriov *iov = dev->sriov;
if (nr_virtfn <= iov->initial_VFs)
return 0;
pci_read_config_dword(dev, iov->pos + PCI_SRIOV_VFM, &table);
bir = PCI_SRIOV_VFM_BIR(table);
if (bir > PCI_STD_RESOURCE_END)
return -EIO;
table = PCI_SRIOV_VFM_OFFSET(table);
if (table + nr_virtfn > pci_resource_len(dev, bir))
return -EIO;
pa = pci_resource_start(dev, bir) + table;
iov->mstate = ioremap(pa, nr_virtfn);
if (!iov->mstate)
return -ENOMEM;
INIT_WORK(&iov->mtask, sriov_migration_task);
iov->ctrl |= PCI_SRIOV_CTRL_VFM | PCI_SRIOV_CTRL_INTR;
pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
return 0;
}
static void sriov_disable_migration(struct pci_dev *dev)
{
struct pci_sriov *iov = dev->sriov;
iov->ctrl &= ~(PCI_SRIOV_CTRL_VFM | PCI_SRIOV_CTRL_INTR);
pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
cancel_work_sync(&iov->mtask);
iounmap(iov->mstate);
}
static int sriov_enable(struct pci_dev *dev, int nr_virtfn) static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
{ {
int rc; int rc;
@ -351,12 +260,6 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
goto failed; goto failed;
} }
if (iov->cap & PCI_SRIOV_CAP_VFM) {
rc = sriov_enable_migration(dev, nr_virtfn);
if (rc)
goto failed;
}
kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE); kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE);
iov->num_VFs = nr_virtfn; iov->num_VFs = nr_virtfn;
@ -387,9 +290,6 @@ static void sriov_disable(struct pci_dev *dev)
if (!iov->num_VFs) if (!iov->num_VFs)
return; return;
if (iov->cap & PCI_SRIOV_CAP_VFM)
sriov_disable_migration(dev);
for (i = 0; i < iov->num_VFs; i++) for (i = 0; i < iov->num_VFs; i++)
virtfn_remove(dev, i, 0); virtfn_remove(dev, i, 0);
@ -687,25 +587,6 @@ void pci_disable_sriov(struct pci_dev *dev)
} }
EXPORT_SYMBOL_GPL(pci_disable_sriov); 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 * pci_num_vf - return number of VFs associated with a PF device_release_driver
* @dev: the PCI device * @dev: the PCI device

4
drivers/pci/pci.h
View File

@ -1,8 +1,6 @@
#ifndef DRIVERS_PCI_H #ifndef DRIVERS_PCI_H
#define DRIVERS_PCI_H #define DRIVERS_PCI_H
#include <linux/workqueue.h>
#define PCI_CFG_SPACE_SIZE 256 #define PCI_CFG_SPACE_SIZE 256
#define PCI_CFG_SPACE_EXP_SIZE 4096 #define PCI_CFG_SPACE_EXP_SIZE 4096
@ -240,8 +238,6 @@ struct pci_sriov {
struct pci_dev *dev; /* lowest numbered PF */ struct pci_dev *dev; /* lowest numbered PF */
struct pci_dev *self; /* this PF */ struct pci_dev *self; /* this PF */
struct mutex lock; /* lock for VF bus */ struct mutex lock; /* lock for VF bus */
struct work_struct mtask; /* VF Migration task */
u8 __iomem *mstate; /* VF Migration State Array */
}; };
#ifdef CONFIG_PCI_ATS #ifdef CONFIG_PCI_ATS

4
include/linux/pci.h
View File

@ -29,7 +29,6 @@
#include <linux/atomic.h> #include <linux/atomic.h>
#include <linux/device.h> #include <linux/device.h>
#include <linux/io.h> #include <linux/io.h>
#include <linux/irqreturn.h>
#include <uapi/linux/pci.h> #include <uapi/linux/pci.h>
#include <linux/pci_ids.h> #include <linux/pci_ids.h>
@ -1577,7 +1576,6 @@ void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar);
#ifdef CONFIG_PCI_IOV #ifdef CONFIG_PCI_IOV
int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn); int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn);
void pci_disable_sriov(struct pci_dev *dev); void pci_disable_sriov(struct pci_dev *dev);
irqreturn_t pci_sriov_migration(struct pci_dev *dev);
int pci_num_vf(struct pci_dev *dev); int pci_num_vf(struct pci_dev *dev);
int pci_vfs_assigned(struct pci_dev *dev); int pci_vfs_assigned(struct pci_dev *dev);
int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs); int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs);
@ -1586,8 +1584,6 @@ int pci_sriov_get_totalvfs(struct pci_dev *dev);
static inline int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn) static inline int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
{ return -ENODEV; } { return -ENODEV; }
static inline void pci_disable_sriov(struct pci_dev *dev) { } static inline void pci_disable_sriov(struct pci_dev *dev) { }
static inline irqreturn_t pci_sriov_migration(struct pci_dev *dev)
{ return IRQ_NONE; }
static inline int pci_num_vf(struct pci_dev *dev) { return 0; } static inline int pci_num_vf(struct pci_dev *dev) { return 0; }
static inline int pci_vfs_assigned(struct pci_dev *dev) static inline int pci_vfs_assigned(struct pci_dev *dev)
{ return 0; } { return 0; }