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Date: Thu, 16 May 2013 09:39:54 +0300
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Yinghai Lu <yinghai@...nel.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>,
Gu Zheng <guz.fnst@...fujitsu.com>, linux-pci@...r.kernel.org,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 6/7] PCI: Make sure VF's driver get attached after PF's
On Mon, May 13, 2013 at 07:28:25PM -0700, Yinghai Lu wrote:
> Found kernel try to load mlx4 drivers for VFs before
> PF's is really loaded when the drivers are built-in, and kernel
> command line include probe_vfs=63, num_vfs=63.
>
> It turns that it also happen for hotadd path even drivers are
> compiled as modules and if they loaded. Esp some VF share the
> same driver with PF.
>
> calling path:
> device driver probe
> ==> pci_enable_sriov
> ==> virtfn_add
> ==> pci_dev_add
> ==> pci_bus_device_add
> when pci_bus_device_add is called, the VF's driver will be attached.
> and at that time PF's driver does not finish yet.
Okay but why is this a problem?
> Need to move out pci_bus_device_add from virtfn_add and call it
> later. Fix the problem for two path,
> 1. hotadd path: use device_schedule_callback.
> 2. for booting path, use initcall to call that for all VF's.
>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> Cc: netdev@...r.kernel.org
>
> ---
> drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c | 7 +
> drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c | 4 -
> drivers/net/ethernet/cisco/enic/enic_main.c | 2
> drivers/net/ethernet/emulex/benet/be_main.c | 4 +
> drivers/net/ethernet/intel/igb/igb_main.c | 11 ++
> drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 2
> drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c | 9 +-
> drivers/net/ethernet/mellanox/mlx4/main.c | 2
> drivers/net/ethernet/neterion/vxge/vxge-main.c | 3
> drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c | 5 +
> drivers/net/ethernet/sfc/efx.c | 1
> drivers/pci/iov.c | 73 +++++++++++++++++--
> drivers/scsi/lpfc/lpfc_init.c | 2
> include/linux/pci.h | 4 +
> 14 files changed, 115 insertions(+), 14 deletions(-)
>
> Index: linux-2.6/drivers/net/ethernet/mellanox/mlx4/main.c
> ===================================================================
> --- linux-2.6.orig/drivers/net/ethernet/mellanox/mlx4/main.c
> +++ linux-2.6/drivers/net/ethernet/mellanox/mlx4/main.c
> @@ -2308,6 +2308,8 @@ slave_start:
> priv->pci_dev_data = pci_dev_data;
> pci_set_drvdata(pdev, dev);
>
> + pci_bus_add_device_vfs(pdev);
> +
> return 0;
>
> err_port:
> Index: linux-2.6/drivers/pci/iov.c
> ===================================================================
> --- linux-2.6.orig/drivers/pci/iov.c
> +++ linux-2.6/drivers/pci/iov.c
> @@ -66,7 +66,8 @@ static void virtfn_remove_bus(struct pci
> pci_remove_bus(child);
> }
>
> -static int virtfn_add(struct pci_dev *dev, int id, int reset)
> +static int virtfn_add(struct pci_dev *dev, int id, int reset,
> + struct pci_dev **ret)
> {
> int i;
> int rc;
> @@ -116,7 +117,6 @@ static int virtfn_add(struct pci_dev *de
> pci_device_add(virtfn, virtfn->bus);
> mutex_unlock(&iov->dev->sriov->lock);
>
> - rc = pci_bus_add_device(virtfn);
> sprintf(buf, "virtfn%u", id);
> rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf);
> if (rc)
> @@ -127,6 +127,8 @@ static int virtfn_add(struct pci_dev *de
>
> kobject_uevent(&virtfn->dev.kobj, KOBJ_CHANGE);
>
> + if (ret)
> + *ret = virtfn;
> return 0;
>
> failed2:
> @@ -141,6 +143,55 @@ failed1:
> return rc;
> }
>
> +static void pci_bus_add_vf(struct pci_dev *dev)
> +{
> + int rc;
> +
> + if (!dev || !dev->is_virtfn || dev->is_added)
> + return;
> +
> + rc = pci_bus_add_device(dev);
> +}
> +
> +static void bus_add_vfs(struct device *device)
> +{
> + struct pci_dev *dev = to_pci_dev(device);
> + int i, num_vfs = pci_num_vf(dev);
> +
> + for (i = 0; i < num_vfs; i++) {
> + struct pci_bus *bus;
> + struct pci_dev *virtfn;
> +
> + bus = pci_find_bus(pci_domain_nr(dev->bus), virtfn_bus(dev, i));
> + if (!bus)
> + continue;
> +
> + virtfn = pci_get_slot(bus, virtfn_devfn(dev, i));
> + pci_bus_add_vf(virtfn);
> + pci_dev_put(virtfn);
> + }
> +}
> +void pci_bus_add_device_vfs(struct pci_dev *pdev)
> +{
> + if (system_state == SYSTEM_BOOTING)
> + return;
> +
> + device_schedule_callback(&pdev->dev, bus_add_vfs);
> +}
> +EXPORT_SYMBOL_GPL(pci_bus_add_device_vfs);
> +
> +/* Make sure all VFs get added before pci_sysfs_init */
> +static int __init pci_bus_add_device_vfs_booting(void)
> +{
> + struct pci_dev *dev = NULL;
> +
> + for_each_pci_dev(dev)
> + pci_bus_add_vf(dev);
> +
> + return 0;
> +}
> +device_initcall_sync(pci_bus_add_device_vfs_booting);
> +
> static void virtfn_remove(struct pci_dev *dev, int id, int reset)
> {
> char buf[VIRTFN_ID_LEN];
> @@ -213,14 +264,22 @@ static void sriov_migration_task(struct
> 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);
> + if (state == PCI_SRIOV_VFM_AV) {
> + struct pci_dev *virtfn = NULL;
> +
> + virtfn_add(iov->self, i, 1, &virtfn);
> + pci_bus_add_vf(virtfn);
> + }
> } 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);
> + if (state == PCI_SRIOV_VFM_AV) {
> + struct pci_dev *virtfn = NULL;
> +
> + virtfn_add(iov->self, i, 0, &virtfn);
> + pci_bus_add_vf(virtfn);
> + }
> }
> }
>
> @@ -356,7 +415,7 @@ static int sriov_enable(struct pci_dev *
> initial = nr_virtfn;
>
> for (i = 0; i < initial; i++) {
> - rc = virtfn_add(dev, i, 0);
> + rc = virtfn_add(dev, i, 0, NULL);
> if (rc)
> goto failed;
> }
> Index: linux-2.6/include/linux/pci.h
> ===================================================================
> --- linux-2.6.orig/include/linux/pci.h
> +++ linux-2.6/include/linux/pci.h
> @@ -1659,6 +1659,7 @@ void __iomem *pci_ioremap_bar(struct pci
>
> #ifdef CONFIG_PCI_IOV
> int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn);
> +void pci_bus_add_device_vfs(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);
> @@ -1670,6 +1671,9 @@ static inline int pci_enable_sriov(struc
> {
> return -ENODEV;
> }
> +static inline void pci_bus_add_device_vfs(struct pci_dev *dev)
> +{
> +}
> static inline void pci_disable_sriov(struct pci_dev *dev)
> {
> }
> Index: linux-2.6/drivers/net/ethernet/intel/igb/igb_main.c
> ===================================================================
> --- linux-2.6.orig/drivers/net/ethernet/intel/igb/igb_main.c
> +++ linux-2.6/drivers/net/ethernet/intel/igb/igb_main.c
> @@ -2366,6 +2366,9 @@ static int igb_probe(struct pci_dev *pde
> }
>
> pm_runtime_put_noidle(&pdev->dev);
> +
> + pci_bus_add_device_vfs(pdev);
> +
> return 0;
>
> err_register:
> @@ -7278,8 +7281,12 @@ static int igb_pci_sriov_configure(struc
> #ifdef CONFIG_PCI_IOV
> if (num_vfs == 0)
> return igb_pci_disable_sriov(dev);
> - else
> - return igb_pci_enable_sriov(dev, num_vfs);
> + else {
> + int ret = igb_pci_enable_sriov(dev, num_vfs);
> + if (ret > 0)
> + pci_bus_add_device_vfs(dev);
> + return ret;
> + }
> #endif
> return 0;
> }
> Index: linux-2.6/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
> ===================================================================
> --- linux-2.6.orig/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
> +++ linux-2.6/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
> @@ -346,8 +346,13 @@ int ixgbe_pci_sriov_configure(struct pci
> {
> if (num_vfs == 0)
> return ixgbe_pci_sriov_disable(dev);
> - else
> - return ixgbe_pci_sriov_enable(dev, num_vfs);
> + else {
> + int ret = ixgbe_pci_sriov_enable(dev, num_vfs);
> +
> + if (ret > 0)
> + pci_bus_add_device_vfs(dev);
> + return ret;
> + }
> }
>
> static int ixgbe_set_vf_multicasts(struct ixgbe_adapter *adapter,
> Index: linux-2.6/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> ===================================================================
> --- linux-2.6.orig/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> +++ linux-2.6/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> @@ -7658,6 +7658,8 @@ skip_sriov:
> IXGBE_LINK_SPEED_10GB_FULL | IXGBE_LINK_SPEED_1GB_FULL,
> true);
>
> + pci_bus_add_device_vfs(pdev);
> +
> return 0;
>
> err_register:
> Index: linux-2.6/drivers/scsi/lpfc/lpfc_init.c
> ===================================================================
> --- linux-2.6.orig/drivers/scsi/lpfc/lpfc_init.c
> +++ linux-2.6/drivers/scsi/lpfc/lpfc_init.c
> @@ -10582,6 +10582,8 @@ lpfc_pci_probe_one(struct pci_dev *pdev,
> else
> rc = lpfc_pci_probe_one_s3(pdev, pid);
>
> + pci_bus_add_device_vfs(pdev);
> +
> return rc;
> }
>
> Index: linux-2.6/drivers/net/ethernet/emulex/benet/be_main.c
> ===================================================================
> --- linux-2.6.orig/drivers/net/ethernet/emulex/benet/be_main.c
> +++ linux-2.6/drivers/net/ethernet/emulex/benet/be_main.c
> @@ -4119,6 +4119,7 @@ static int lancer_recover_func(struct be
> if (status)
> goto err;
>
> + pci_bus_add_device_vfs(adapter->pdev);
> if (netif_running(adapter->netdev)) {
> status = be_open(adapter->netdev);
> if (status)
> @@ -4335,6 +4336,8 @@ static int be_probe(struct pci_dev *pdev
> dev_info(&pdev->dev, "%s: %s %s port %c\n", nic_name(pdev),
> func_name(adapter), mc_name(adapter), port_name);
>
> + pci_bus_add_device_vfs(pdev);
> +
> return 0;
>
> unsetup:
> @@ -4406,6 +4409,7 @@ static int be_resume(struct pci_dev *pde
> rtnl_unlock();
> }
>
> + pci_bus_add_device_vfs(adapter->pdev);
> schedule_delayed_work(&adapter->func_recovery_work,
> msecs_to_jiffies(1000));
> netif_device_attach(netdev);
> Index: linux-2.6/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c
> ===================================================================
> --- linux-2.6.orig/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c
> +++ linux-2.6/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c
> @@ -568,8 +568,11 @@ int qlcnic_pci_sriov_configure(struct pc
>
> if (num_vfs == 0)
> err = qlcnic_pci_sriov_disable(adapter);
> - else
> + else {
> err = qlcnic_pci_sriov_enable(adapter, num_vfs);
> + if (err > 0)
> + pci_bus_add_device_vfs(dev);
> + }
>
> clear_bit(__QLCNIC_RESETTING, &adapter->state);
> return err;
> Index: linux-2.6/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c
> ===================================================================
> --- linux-2.6.orig/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c
> +++ linux-2.6/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c
> @@ -3048,7 +3048,12 @@ int bnx2x_sriov_configure(struct pci_dev
> pci_disable_sriov(dev);
> return 0;
> } else {
> - return bnx2x_enable_sriov(bp);
> + int ret = bnx2x_enable_sriov(bp);
> +
> + if (ret > 0)
> + pci_bus_add_device_vfs(dev);
> +
> + return 0;
> }
> }
>
> Index: linux-2.6/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
> ===================================================================
> --- linux-2.6.orig/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
> +++ linux-2.6/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
> @@ -5749,10 +5749,12 @@ static int init_one(struct pci_dev *pdev
> sriov:
> #ifdef CONFIG_PCI_IOV
> if (func < ARRAY_SIZE(num_vf) && num_vf[func] > 0)
> - if (pci_enable_sriov(pdev, num_vf[func]) == 0)
> + if (pci_enable_sriov(pdev, num_vf[func]) == 0) {
> dev_info(&pdev->dev,
> "instantiated %u virtual functions\n",
> num_vf[func]);
> + pci_bus_add_device_vfs(pdev);
> + }
> #endif
> return 0;
>
> Index: linux-2.6/drivers/net/ethernet/cisco/enic/enic_main.c
> ===================================================================
> --- linux-2.6.orig/drivers/net/ethernet/cisco/enic/enic_main.c
> +++ linux-2.6/drivers/net/ethernet/cisco/enic/enic_main.c
> @@ -2524,6 +2524,8 @@ static int enic_probe(struct pci_dev *pd
> goto err_out_dev_deinit;
> }
>
> + pci_bus_add_device_vfs(pdev);
> +
> return 0;
>
> err_out_dev_deinit:
> Index: linux-2.6/drivers/net/ethernet/neterion/vxge/vxge-main.c
> ===================================================================
> --- linux-2.6.orig/drivers/net/ethernet/neterion/vxge/vxge-main.c
> +++ linux-2.6/drivers/net/ethernet/neterion/vxge/vxge-main.c
> @@ -4731,6 +4731,9 @@ vxge_probe(struct pci_dev *pdev, const s
> vxge_hw_device_trace_level_get(hldev));
>
> kfree(ll_config);
> +
> + pci_bus_add_device_vfs(pdev);
> +
> return 0;
>
> _exit6:
> Index: linux-2.6/drivers/net/ethernet/sfc/efx.c
> ===================================================================
> --- linux-2.6.orig/drivers/net/ethernet/sfc/efx.c
> +++ linux-2.6/drivers/net/ethernet/sfc/efx.c
> @@ -2822,6 +2822,7 @@ static int efx_pci_probe(struct pci_dev
> netif_warn(efx, probe, efx->net_dev,
> "pci_enable_pcie_error_reporting failed (%d)\n", rc);
>
> + pci_bus_add_device_vfs(pci_dev);
> return 0;
>
> fail4:
> --
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