Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965455Ab2JCRwJ (ORCPT ); Wed, 3 Oct 2012 13:52:09 -0400 Received: from acsinet15.oracle.com ([141.146.126.227]:34371 "EHLO acsinet15.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965423Ab2JCRwH (ORCPT ); Wed, 3 Oct 2012 13:52:07 -0400 From: Yinghai Lu To: Bjorn Helgaas , Greg Kroah-Hartman Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Don Dutile , yuvalmin@broadcom.com, bhutchings@solarflare.com, gregory.v.rose@intel.com, davem@davemloft.net--no-chain-reply-to, Yinghai Lu Subject: [PATCH 4/5] PCI: Add max_vfs in sysfs per pci device where supports Date: Wed, 3 Oct 2012 10:51:34 -0700 Message-Id: <1349286695-26713-5-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.7.7 In-Reply-To: <1349286695-26713-1-git-send-email-yinghai@kernel.org> References: <506C3B11.9010009@redhat.com> <1349286695-26713-1-git-send-email-yinghai@kernel.org> X-Source-IP: acsinet22.oracle.com [141.146.126.238] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2905 Lines: 107 only pci device that support sriov will have max_vfs show up in /sys when user set value in /sys, driver ops set_max_vfs will be called to enable VF there. Signed-off-by: Yinghai Lu --- 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 majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/