On Wed, Oct 03, 2012 at 10:51:34AM -0700, Yinghai Lu wrote: > only pci device that support sriov will have max_vfs show up in /sys ^-Only ^-devices ^-SRIOV
> > when user set value in /sys, driver ops set_max_vfs will be called to enable > VF there. Huh? What value? What are they enabling? Your comment makes it sound as if setting any value (say '0xdeadbeef') will be called to enable a VF. I don't think that is what the code does. Can you explain what the proper values are to be submitted to the SysFS value 'max_vfs' and what the kernel ought to be doing? Perhaps include a little snippet from the kernel log so if somebody has a bug they can look at see what you got and can compare? Thank you. > > Signed-off-by: Yinghai Lu <[email protected]> > --- > drivers/pci/pci-sysfs.c | 51 > +++++++++++++++++++++++++++++++++++++++++++++++ > include/linux/pci.h | 1 + > 2 files changed, 52 insertions(+), 0 deletions(-) > > diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c > index fbbb97f..9b6f409 100644 > --- a/drivers/pci/pci-sysfs.c > +++ b/drivers/pci/pci-sysfs.c > @@ -458,6 +458,52 @@ boot_vga_show(struct device *dev, struct > device_attribute *attr, char *buf) > } > struct device_attribute vga_attr = __ATTR_RO(boot_vga); > > +static ssize_t > +max_vfs_show(struct device *dev, struct device_attribute *attr, char *buf) > +{ > + struct pci_dev *pdev = to_pci_dev(dev); > + > + return sprintf(buf, "%u\n", pdev->max_vfs); > +} > + > +static void max_vfs_callback(struct device *dev) > +{ > + struct pci_dev *pdev = to_pci_dev(dev); > + > + mutex_lock(&pci_remove_rescan_mutex); > + if (pdev->is_added && dev->driver) { > + struct pci_driver *pdrv; > + > + pdrv = to_pci_driver(dev->driver); > + if (pdrv->set_max_vfs) > + pdrv->set_max_vfs(pdev); > + > + } > + mutex_unlock(&pci_remove_rescan_mutex); > +} > +static ssize_t > +max_vfs_store(struct device *dev, struct device_attribute *attr, > + const char *buf, size_t count) > +{ > + unsigned long val; > + int err; > + struct pci_dev *pdev = to_pci_dev(dev); > + > + if (kstrtoul(buf, 0, &val) < 0) > + return -EINVAL; > + > + pdev->max_vfs = val; > + > + err = device_schedule_callback(dev, max_vfs_callback); > + > + if (err) > + return err; > + > + return count; > +} > +struct device_attribute max_vfs_attr = > + __ATTR(max_vfs, 0644, max_vfs_show, max_vfs_store); > + > static void > pci_config_pm_runtime_get(struct pci_dev *pdev) > { > @@ -1405,6 +1451,7 @@ late_initcall(pci_sysfs_init); > > static struct attribute *pci_dev_dev_attrs[] = { > &vga_attr.attr, > + &max_vfs_attr.attr, > NULL, > }; > > @@ -1418,6 +1465,10 @@ static umode_t pci_dev_attrs_are_visible(struct > kobject *kobj, > if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA) > return 0; > > + if (a == &max_vfs_attr.attr) > + if (!pdev->is_physfn) > + return 0; > + > return a->mode; > } > > diff --git a/include/linux/pci.h b/include/linux/pci.h > index 7d70a5e..f7423d4 100644 > --- a/include/linux/pci.h > +++ b/include/linux/pci.h > @@ -335,6 +335,7 @@ struct pci_dev { > unsigned int broken_intx_masking:1; > unsigned int io_window_1k:1; /* Intel P2P bridge 1K I/O windows */ > pci_dev_flags_t dev_flags; > + unsigned int max_vfs; > atomic_t enable_cnt; /* pci_enable_device has been called */ > > u32 saved_config_space[16]; /* config space saved at > suspend time */ > -- > 1.7.7 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to [email protected] > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
