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Date: Fri, 11 Jul 2014 07:13:27 -0600
From: Alex Williamson <alex.williamson@...hat.com>
To: Ethan Zhao <ethan.zhao@...cle.com>
Cc: bhelgaas@...gle.com, konrad.wilk@...cle.com,
boris.ostrovsky@...cle.com, david.vrabel@...rix.com,
gleb@...nel.org, pbonzini@...hat.com, jeffrey.t.kirsher@...el.com,
jesse.brandeburg@...el.com, bruce.w.allan@...el.com,
carolyn.wyborny@...el.com, donald.c.skidmore@...el.com,
gregory.v.rose@...el.com, alexander.h.duyck@...el.com,
john.ronciak@...el.com, mitch.a.williams@...el.com,
linux-pci@...r.kernel.org, kvm@...r.kernel.org,
linux.nics@...el.com, e1000-devel@...ts.sourceforge.net,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
ethan.kernel@...il.com, vaughan.cao@...cle.com
Subject: Re: [PATCH 1/2 V3] PCI: introduce device assignment interface and
refactory related code
On Fri, 2014-07-11 at 20:30 +0800, Ethan Zhao wrote:
> This patch introduces two new device assignment functions
>
> pci_iov_assign_device(),
> pci_iov_deassign_device()
>
> along with the existed one
>
> pci_vfs_assigned()
>
> They construct the VFs assignment management interface, used to assign/
> deassign device to VM and query the VFs reference counter. instead of
> direct manipulation of device flag.
>
> This patch refashioned the related code and make them atomic.
>
> v3: change the naming of device assignment helpers, because they work
> for all kind of PCI device, not only SR-IOV (david.vrabel@...rix.com)
>
> v2: reorder the patchset and make it bisectable and atomic, steps clear
> between interface defination and implemenation according to the
> suggestion from alex.williamson@...hat.com
>
> Signed-off-by: Ethan Zhao <ethan.zhao@...cle.com>
> ---
- Use a cover patch to describe the series
- Version information goes here, below the "---", not above it
- I stand by the patch breakdown I suggested originally, there are too
many logical changes here in patch 1. There are easily 3 separate
patches here.
- Renaming s/sriov/iov/ doesn't address the problem David raised. The
name is still synonymous with SR-IOV and it's defined on
drivers/pci/iov.c, which is only built with CONFIG_PCI_IOV.
- PCI_DEV_FLAGS_ASSIGNED should be unused after this series, why is it
not removed?
> drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c | 17 ++---------------
> drivers/pci/iov.c | 20 ++++++++++++++++++++
> drivers/xen/xen-pciback/pci_stub.c | 4 ++--
> include/linux/pci.h | 4 ++++
> virt/kvm/assigned-dev.c | 2 +-
> virt/kvm/iommu.c | 4 ++--
- This patch touch 4 separate logical code areas, who do you expect to
ack and commit it? Split it up.
> 6 files changed, 31 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> index 02c11a7..781040e 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> @@ -693,22 +693,9 @@ complete_reset:
> static bool i40e_vfs_are_assigned(struct i40e_pf *pf)
> {
> struct pci_dev *pdev = pf->pdev;
> - struct pci_dev *vfdev;
> -
> - /* loop through all the VFs to see if we own any that are assigned */
> - vfdev = pci_get_device(PCI_VENDOR_ID_INTEL, I40E_DEV_ID_VF , NULL);
> - while (vfdev) {
> - /* if we don't own it we don't care */
> - if (vfdev->is_virtfn && pci_physfn(vfdev) == pdev) {
> - /* if it is assigned we cannot release it */
> - if (vfdev->dev_flags & PCI_DEV_FLAGS_ASSIGNED)
> - return true;
> - }
>
> - vfdev = pci_get_device(PCI_VENDOR_ID_INTEL,
> - I40E_DEV_ID_VF,
> - vfdev);
> - }
> + if (pci_vfs_assigned(pdev))
> + return true;
>
> return false;
> }
> diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
> index de7a747..090f827 100644
> --- a/drivers/pci/iov.c
> +++ b/drivers/pci/iov.c
> @@ -644,6 +644,26 @@ int pci_vfs_assigned(struct pci_dev *dev)
> EXPORT_SYMBOL_GPL(pci_vfs_assigned);
>
> /**
> + * pci_iov_assign_device - assign device to VM
> + * @pdev: the device to be assigned.
> + */
> +void pci_iov_assign_device(struct pci_dev *pdev)
> +{
> + pdev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED;
> +}
> +EXPORT_SYMBOL_GPL(pci_iov_assign_device);
> +
> +/**
> + * pci_iov_deassign_device - deasign device from VM
> + * @pdev: the device to be deassigned.
> + */
> +void pci_iov_deassign_device(struct pci_dev *pdev)
> +{
> + pdev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
> +}
> +EXPORT_SYMBOL_GPL(pci_iov_deassign_device);
> +
> +/**
> * pci_sriov_set_totalvfs -- reduce the TotalVFs available
> * @dev: the PCI PF device
> * @numvfs: number that should be used for TotalVFs supported
> diff --git a/drivers/xen/xen-pciback/pci_stub.c b/drivers/xen/xen-pciback/pci_stub.c
> index 62fcd48..27e00d1 100644
> --- a/drivers/xen/xen-pciback/pci_stub.c
> +++ b/drivers/xen/xen-pciback/pci_stub.c
> @@ -133,7 +133,7 @@ static void pcistub_device_release(struct kref *kref)
> xen_pcibk_config_free_dyn_fields(dev);
> xen_pcibk_config_free_dev(dev);
>
> - dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
> + pci_iov_deassign_device(dev);
> pci_dev_put(dev);
>
> kfree(psdev);
> @@ -404,7 +404,7 @@ static int pcistub_init_device(struct pci_dev *dev)
> dev_dbg(&dev->dev, "reset device\n");
> xen_pcibk_reset_device(dev);
>
> - dev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED;
> + pci_iov_assign_device(dev);
> return 0;
>
> config_release:
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index aab57b4..5ece6d6 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -1603,6 +1603,8 @@ int pci_num_vf(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_get_totalvfs(struct pci_dev *dev);
> +void pci_iov_assign_device(struct pci_dev *dev);
> +void pci_iov_deassign_device(struct pci_dev *dev);
> #else
> static inline int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
> { return -ENODEV; }
> @@ -1614,6 +1616,8 @@ static inline int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs)
> { return 0; }
> static inline int pci_sriov_get_totalvfs(struct pci_dev *dev)
> { return 0; }
> +static inline void pci_iov_assign_device(struct pci_dev *dev) { }
> +static inline void pci_iov_deassign_device(struct pci_dev *dev) { }
> #endif
>
> #if defined(CONFIG_HOTPLUG_PCI) || defined(CONFIG_HOTPLUG_PCI_MODULE)
> diff --git a/virt/kvm/assigned-dev.c b/virt/kvm/assigned-dev.c
> index bf06577..7fac58d 100644
> --- a/virt/kvm/assigned-dev.c
> +++ b/virt/kvm/assigned-dev.c
> @@ -302,7 +302,7 @@ static void kvm_free_assigned_device(struct kvm *kvm,
> else
> pci_restore_state(assigned_dev->dev);
>
> - assigned_dev->dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
> + pci_iov_deassign_device(assigned_dev->dev);
>
> pci_release_regions(assigned_dev->dev);
> pci_disable_device(assigned_dev->dev);
> diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c
> index 0df7d4b..641ee73 100644
> --- a/virt/kvm/iommu.c
> +++ b/virt/kvm/iommu.c
> @@ -194,7 +194,7 @@ int kvm_assign_device(struct kvm *kvm,
> goto out_unmap;
> }
>
> - pdev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED;
> + pci_iov_assign_device(pdev);
>
> dev_info(&pdev->dev, "kvm assign device\n");
>
> @@ -220,7 +220,7 @@ int kvm_deassign_device(struct kvm *kvm,
>
> iommu_detach_device(domain, &pdev->dev);
>
> - pdev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
> + pci_iov_deassign_device(pdev);
>
> dev_info(&pdev->dev, "kvm deassign device\n");
>
--
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