[PATCH V7 08/10] powerpc/powernv: Support PCI config restore for VFs
Bjorn Helgaas
bhelgaas at google.com
Tue Jun 2 10:01:36 AEST 2015
On Tue, May 19, 2015 at 06:50:10PM +0800, Wei Yang wrote:
> After PE reset, OPAL API opal_pci_reinit() is called on all devices
> contained in the PE to reinitialize them. However, VFs can't be seen
> from skiboot firmware. We have to implement the functions, similar
> those in skiboot firmware, to reinitialize VFs after reset on PE
> for VFs.
>
> [gwshan: changelog and code refactoring]
> Signed-off-by: Wei Yang <weiyang at linux.vnet.ibm.com>
> Acked-by: Gavin Shan <gwshan at linux.vnet.ibm.com>
> ---
> arch/powerpc/include/asm/pci-bridge.h | 1 +
> arch/powerpc/platforms/powernv/eeh-powernv.c | 70 +++++++++++++++++++++++++-
> arch/powerpc/platforms/powernv/pci.c | 18 +++++++
> 3 files changed, 88 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/include/asm/pci-bridge.h b/arch/powerpc/include/asm/pci-bridge.h
> index c324882..ad60263 100644
> --- a/arch/powerpc/include/asm/pci-bridge.h
> +++ b/arch/powerpc/include/asm/pci-bridge.h
> @@ -206,6 +206,7 @@ struct pci_dn {
> #define IODA_INVALID_M64 (-1)
> int m64_wins[PCI_SRIOV_NUM_BARS][M64_PER_IOV];
> #endif /* CONFIG_PCI_IOV */
> + int mps;
> #endif
> struct list_head child_list;
> struct list_head list;
> diff --git a/arch/powerpc/platforms/powernv/eeh-powernv.c b/arch/powerpc/platforms/powernv/eeh-powernv.c
> index 7af3c1e..33deb78 100644
> --- a/arch/powerpc/platforms/powernv/eeh-powernv.c
> +++ b/arch/powerpc/platforms/powernv/eeh-powernv.c
> @@ -1612,6 +1612,67 @@ static int pnv_eeh_next_error(struct eeh_pe **pe)
> return ret;
> }
>
> +static int pnv_eeh_restore_vf_config(struct pci_dn *pdn)
> +{
> + struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
> + u32 devctl, cmd, cap2, aer_capctl;
> + int old_mps;
> +
> + /* Restore MPS */
> + if (edev->pcie_cap) {
> + old_mps = (ffs(pdn->mps) - 8) << 5;
> + eeh_ops->read_config(pdn, edev->pcie_cap + PCI_EXP_DEVCTL,
> + 2, &devctl);
> + devctl &= ~PCI_EXP_DEVCTL_PAYLOAD;
> + devctl |= old_mps;
> + eeh_ops->write_config(pdn, edev->pcie_cap + PCI_EXP_DEVCTL,
> + 2, devctl);
> + }
> +
> + /* Disable Completion Timeout */
> + if (edev->pcie_cap) {
> + eeh_ops->read_config(pdn, edev->pcie_cap + PCI_EXP_DEVCAP2,
> + 4, &cap2);
> + if (cap2 & 0x10) {
> + eeh_ops->read_config(pdn,
> + edev->pcie_cap + PCI_EXP_DEVCTL2,
> + 4, &cap2);
> + cap2 |= 0x10;
> + eeh_ops->write_config(pdn,
> + edev->pcie_cap + PCI_EXP_DEVCTL2,
> + 4, cap2);
> + }
> + }
> +
> + /* Enable SERR and parity checking */
> + eeh_ops->read_config(pdn, PCI_COMMAND, 2, &cmd);
> + cmd |= (PCI_COMMAND_PARITY | PCI_COMMAND_SERR);
> + eeh_ops->write_config(pdn, PCI_COMMAND, 2, cmd);
> +
> + /* Enable report various errors */
> + if (edev->pcie_cap) {
> + eeh_ops->read_config(pdn, edev->pcie_cap + PCI_EXP_DEVCTL,
> + 2, &devctl);
> + devctl &= ~PCI_EXP_DEVCTL_CERE;
> + devctl |= (PCI_EXP_DEVCTL_NFERE |
> + PCI_EXP_DEVCTL_FERE |
> + PCI_EXP_DEVCTL_URRE);
> + eeh_ops->write_config(pdn, edev->pcie_cap + PCI_EXP_DEVCTL,
> + 2, devctl);
> + }
> +
> + /* Enable ECRC generation and check */
> + if (edev->pcie_cap && edev->aer_cap) {
> + eeh_ops->read_config(pdn, edev->aer_cap + PCI_ERR_CAP,
> + 4, &aer_capctl);
> + aer_capctl |= (PCI_ERR_CAP_ECRC_GENE | PCI_ERR_CAP_ECRC_CHKE);
> + eeh_ops->write_config(pdn, edev->aer_cap + PCI_ERR_CAP,
> + 4, aer_capctl);
> + }
Where is all this stuff set up the first time? It'd be nice if we could
use the same path that did it the first time.
Are we setting up a PF or a VF here? The function is called
pnv_eeh_restore_vf_config(), but it's called when "edev->physfn", so it's a
little confusing.
> +
> + return 0;
> +}
> +
> static int pnv_eeh_restore_config(struct pci_dn *pdn)
> {
> struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
> @@ -1622,7 +1683,14 @@ static int pnv_eeh_restore_config(struct pci_dn *pdn)
> return -EEXIST;
>
> phb = edev->phb->private_data;
> - ret = opal_pci_reinit(phb->opal_id,
> + /*
> + * We have to restore the PCI config space after reset since the
> + * firmware can't see SRIOV VFs.
> + */
> + if (edev->physfn)
> + ret = pnv_eeh_restore_vf_config(pdn);
> + else
> + ret = opal_pci_reinit(phb->opal_id,
> OPAL_REINIT_PCI_DEV, edev->config_addr);
> if (ret) {
> pr_warn("%s: Can't reinit PCI dev 0x%x (%lld)\n",
> diff --git a/arch/powerpc/platforms/powernv/pci.c b/arch/powerpc/platforms/powernv/pci.c
> index bca2aeb..10bc8c3 100644
> --- a/arch/powerpc/platforms/powernv/pci.c
> +++ b/arch/powerpc/platforms/powernv/pci.c
> @@ -729,6 +729,24 @@ static void pnv_p7ioc_rc_quirk(struct pci_dev *dev)
> }
> DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_IBM, 0x3b9, pnv_p7ioc_rc_quirk);
>
> +#ifdef CONFIG_PCI_IOV
> +static void pnv_pci_fixup_vf_mps(struct pci_dev *pdev)
> +{
> + struct pci_dn *pdn = pci_get_pdn(pdev);
> + int parent_mps;
> +
> + if (!pdev->is_virtfn)
> + return;
> +
> + /* Synchronize MPS for VF and PF */
> + parent_mps = pcie_get_mps(pdev->physfn);
> + if ((128 << pdev->pcie_mpss) >= parent_mps)
> + pcie_set_mps(pdev, parent_mps);
> + pdn->mps = pcie_get_mps(pdev);
> +}
> +DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pnv_pci_fixup_vf_mps);
Same comment as before -- I don't like this usage of fixups. Would it work
to do this in pcibios_add_device()?
I assume you need this to happen when you hot-remove and hot-add a VF
during EEH recovery? Where does this happen in the normal hotplug path,
e.g., pciehp, and can you do it in a corresponding place for EEH hotplug?
> +#endif /* CONFIG_PCI_IOV */
> +
> void __init pnv_pci_init(void)
> {
> struct device_node *np;
> --
> 1.7.9.5
>
> --
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