[PATCH 1/8] PCI: Add pcibios_stop_dev()

[Bjorn Helgaas]

On Thu, Jul 4, 2013 at 8:57 PM, Gavin Shan <shangw at linux.vnet.ibm.com> wrote:
> When stopping and removing one specific PCI device, the platform
> might need take some actions. One example is that EEH already had
> eeh cache and eeh device attached to the PCI device, and we need
> release eeh cache and device during the time. The patch introduces
> hook pcibios_stop_dev() for the purpose.
>
> Cc: Bjorn Helgaas <bhelgaas at google.com>
> Cc: linux-pci at vger.kernel.org
> Signed-off-by: Gavin Shan <shangw at linux.vnet.ibm.com>
> ---
>  drivers/pci/probe.c  |    4 ++++
>  drivers/pci/remove.c |    2 ++
>  include/linux/pci.h  |    1 +
>  3 files changed, 7 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 70f10fa..7167dc4 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -1669,6 +1669,10 @@ void __weak pcibios_remove_bus(struct pci_bus *bus)
>  {
>  }
>
> +void __weak pcibios_stop_dev(struct pci_dev *dev)
> +{
> +}
> +
>  struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
>                 struct pci_ops *ops, void *sysdata, struct list_head *resources)
>  {
> diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
> index 8fc54b7..e329efc 100644
> --- a/drivers/pci/remove.c
> +++ b/drivers/pci/remove.c
> @@ -21,6 +21,8 @@ static void pci_stop_dev(struct pci_dev *dev)
>  {
>         pci_pme_active(dev, false);
>
> +       pcibios_stop_dev(dev);

We already have pcibios_release_device() (just merged for v3.11).
Would that work for you?  I haven't seen your whole series, so I can't
tell whether you need something different.

>         if (dev->is_added) {
>                 pci_proc_detach_device(dev);
>                 pci_remove_sysfs_dev_files(dev);
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 3a24e4f..40df783 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -696,6 +696,7 @@ int no_pci_devices(void);
>  void pcibios_resource_survey_bus(struct pci_bus *bus);
>  void pcibios_add_bus(struct pci_bus *bus);
>  void pcibios_remove_bus(struct pci_bus *bus);
> +void pcibios_stop_dev(struct pci_dev *dev);
>  void pcibios_fixup_bus(struct pci_bus *);
>  int __must_check pcibios_enable_device(struct pci_dev *, int mask);
>  /* Architecture specific versions may override this (weak) */
> --
> 1.7.5.4
>