On Tue, May 19, 2015 at 06:50:08PM +0800, Wei Yang wrote:
> Current EEH recovery code works with the assumption: the PE has primary
> bus. Unfortunately, that's not true to VF PEs, which generally contains
> one or multiple VFs (for VF group case). The patch creates PEs for VFs
> at PCI final fixup time. Those PEs for VFs are indentified with newly
> introduced flag EEH_PE_VF so that we handle them differently during
> EEH recovery.
>
> [gwshan: changelog and code refactoring]
> Signed-off-by: Wei Yang <weiyang@xxxxxxxxxxxxxxxxxx>
> Acked-by: Gavin Shan <gwshan@xxxxxxxxxxxxxxxxxx>
> ---
> arch/powerpc/include/asm/eeh.h | 1 +
> arch/powerpc/kernel/eeh_pe.c | 10 ++++++++--
> arch/powerpc/platforms/powernv/eeh-powernv.c | 17 +++++++++++++++++
> 3 files changed, 26 insertions(+), 2 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/eeh.h b/arch/powerpc/include/asm/eeh.h
> index 1b3614d..c1fde48 100644
> --- a/arch/powerpc/include/asm/eeh.h
> +++ b/arch/powerpc/include/asm/eeh.h
> @@ -70,6 +70,7 @@ struct pci_dn;
> #define EEH_PE_PHB (1 << 1) /* PHB PE */
> #define EEH_PE_DEVICE (1 << 2) /* Device PE */
> #define EEH_PE_BUS (1 << 3) /* Bus PE */
> +#define EEH_PE_VF (1 << 4) /* VF PE */
>
> #define EEH_PE_ISOLATED (1 << 0) /* Isolated PE */
> #define EEH_PE_RECOVERING (1 << 1) /* Recovering PE */
> diff --git a/arch/powerpc/kernel/eeh_pe.c b/arch/powerpc/kernel/eeh_pe.c
> index 35f0b62..260a701 100644
> --- a/arch/powerpc/kernel/eeh_pe.c
> +++ b/arch/powerpc/kernel/eeh_pe.c
> @@ -299,7 +299,10 @@ static struct eeh_pe *eeh_pe_get_parent(struct eeh_dev *edev)
> * EEH device already having associated PE, but
> * the direct parent EEH device doesn't have yet.
> */
> - pdn = pdn ? pdn->parent : NULL;
> + if (edev->physfn)
> + pdn = pci_get_pdn(edev->physfn);
> + else
> + pdn = pdn ? pdn->parent : NULL;
> while (pdn) {
> /* We're poking out of PCI territory */
> parent = pdn_to_eeh_dev(pdn);
> @@ -382,7 +385,10 @@ int eeh_add_to_parent_pe(struct eeh_dev *edev)
> }
>
> /* Create a new EEH PE */
> - pe = eeh_pe_alloc(edev->phb, EEH_PE_DEVICE);
> + if (edev->physfn)
> + pe = eeh_pe_alloc(edev->phb, EEH_PE_VF);
> + else
> + pe = eeh_pe_alloc(edev->phb, EEH_PE_DEVICE);
> if (!pe) {
> pr_err("%s: out of memory!\n", __func__);
> return -ENOMEM;
> diff --git a/arch/powerpc/platforms/powernv/eeh-powernv.c b/arch/powerpc/platforms/powernv/eeh-powernv.c
> index ce738ab..c505036 100644
> --- a/arch/powerpc/platforms/powernv/eeh-powernv.c
> +++ b/arch/powerpc/platforms/powernv/eeh-powernv.c
> @@ -1520,6 +1520,23 @@ static struct eeh_ops pnv_eeh_ops = {
> .restore_config = pnv_eeh_restore_config
> };
>
> +static void pnv_eeh_vf_final_fixup(struct pci_dev *pdev)
> +{
> + struct pci_dn *pdn = pci_get_pdn(pdev);
> +
> + if (!pdev->is_virtfn)
> + return;
> +
> + /*
> + * The following operations will fail if VF's sysfs files
> + * aren't created or its resources aren't finalized.
> + */
I don't understand this comment. "The following operations" seems to refer
to eeh_add_device_early() and eeh_add_device_late(), and
"VF's sysfs files being created" seems to refer to eeh_sysfs_add_device().
So the comment suggests that eeh_add_device_early() and
eeh_add_device_late() will fail because they're called before
eeh_sysfs_add_device(). So I think you must be talking about some other
"following operations," not eeh_add_device_early() and
eeh_add_device_late().
> + eeh_add_device_early(pdn);
> + eeh_add_device_late(pdev);
> + eeh_sysfs_add_device(pdev);
> +}
> +DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, pnv_eeh_vf_final_fixup);
Ugh. This is powerpc code, but I don't like using fixups as a hook like
this. There is a pcibios_add_device() -- could this be done there?
If not, what happens after pcibios_add_device() that is required for this
code? Maybe we need a pcibios_bus_add_device() hook?
> +
> /**
> * eeh_powernv_init - Register platform dependent EEH operations
> *
> --
> 1.7.9.5
>
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