On Thu, Jan 15, 2015 at 10:28:02AM +0800, Wei Yang wrote:
> On PHB3, PF IOV BAR will be covered by M64 BAR to have better PE isolation.
> Mostly the total_pe number is different from the total_VFs, which will lead
> to a conflict between MMIO space and the PE number.
>
> For example, total_VFs is 128 and total_pe is 256, then the second half of
> M64 BAR space will be part of other PCI device, which may already belongs
> to other PEs.
>
> This patch reserve additional space for the PF IOV BAR, which is total_pe
> number of VF's BAR size. By doing so, it prevents the conflict.
>
> Signed-off-by: Wei Yang <weiyang@xxxxxxxxxxxxxxxxxx>
> ---
> arch/powerpc/include/asm/machdep.h | 4 ++
> arch/powerpc/include/asm/pci-bridge.h | 3 ++
> arch/powerpc/kernel/pci-common.c | 5 +++
> arch/powerpc/platforms/powernv/pci-ioda.c | 59 +++++++++++++++++++++++++++++
> 4 files changed, 71 insertions(+)
>
> diff --git a/arch/powerpc/include/asm/machdep.h b/arch/powerpc/include/asm/machdep.h
> index c8175a3..965547c 100644
> --- a/arch/powerpc/include/asm/machdep.h
> +++ b/arch/powerpc/include/asm/machdep.h
> @@ -250,6 +250,10 @@ struct machdep_calls {
> /* Reset the secondary bus of bridge */
> void (*pcibios_reset_secondary_bus)(struct pci_dev *dev);
>
> +#ifdef CONFIG_PCI_IOV
> + void (*pcibios_fixup_sriov)(struct pci_bus *bus);
> +#endif /* CONFIG_PCI_IOV */
> +
> /* Called to shutdown machine specific hardware not already controlled
> * by other drivers.
> */
> diff --git a/arch/powerpc/include/asm/pci-bridge.h b/arch/powerpc/include/asm/pci-bridge.h
> index 334e745..b857ec4 100644
> --- a/arch/powerpc/include/asm/pci-bridge.h
> +++ b/arch/powerpc/include/asm/pci-bridge.h
> @@ -170,6 +170,9 @@ struct pci_dn {
> #define IODA_INVALID_PE (-1)
> #ifdef CONFIG_PPC_POWERNV
> int pe_number;
> +#ifdef CONFIG_PCI_IOV
> + u16 max_vfs; /* number of VFs IOV BAR expended */
> +#endif /* CONFIG_PCI_IOV */
> #endif
> struct list_head child_list;
> struct list_head list;
> diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
> index 889f743..832b7e1 100644
> --- a/arch/powerpc/kernel/pci-common.c
> +++ b/arch/powerpc/kernel/pci-common.c
> @@ -1636,6 +1636,11 @@ void pcibios_scan_phb(struct pci_controller *hose)
> if (ppc_md.pcibios_fixup_phb)
> ppc_md.pcibios_fixup_phb(hose);
>
> +#ifdef CONFIG_PCI_IOV
> + if (ppc_md.pcibios_fixup_sriov)
> + ppc_md.pcibios_fixup_sriov(bus);
> +#endif /* CONFIG_PCI_IOV */
> +
> /* Configure PCI Express settings */
> if (bus && !pci_has_flag(PCI_PROBE_ONLY)) {
> struct pci_bus *child;
> diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
> index 31335a7..6704fdf 100644
> --- a/arch/powerpc/platforms/powernv/pci-ioda.c
> +++ b/arch/powerpc/platforms/powernv/pci-ioda.c
> @@ -1721,6 +1721,62 @@ static void pnv_pci_init_ioda_msis(struct pnv_phb *phb)
> static void pnv_pci_init_ioda_msis(struct pnv_phb *phb) { }
> #endif /* CONFIG_PCI_MSI */
>
> +#ifdef CONFIG_PCI_IOV
> +static void pnv_pci_ioda_fixup_iov_resources(struct pci_dev *pdev)
> +{
> + struct pci_controller *hose;
> + struct pnv_phb *phb;
> + struct resource *res;
> + int i;
> + resource_size_t size;
> + struct pci_dn *pdn;
> +
> + if (!pdev->is_physfn || pdev->is_added)
> + return;
> +
> + hose = pci_bus_to_host(pdev->bus);
> + phb = hose->private_data;
> +
> + pdn = pci_get_pdn(pdev);
> + pdn->max_vfs = 0;
^^^ point A
> +
> + for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) {
> + res = &pdev->resource[i];
> + if (!res->flags || res->parent)
> + continue;
> + if (!pnv_pci_is_mem_pref_64(res->flags)) {
> + dev_warn(&pdev->dev, " Skipping expanding IOV BAR %pR on %s\n",
> + res, pci_name(pdev));
> + continue;
> + }
> +
> + dev_dbg(&pdev->dev, " Fixing VF BAR[%d] %pR to\n", i, res);
> + size = pci_iov_resource_size(pdev, i);
> + res->end = res->start + size * phb->ioda.total_pe - 1;
> + dev_dbg(&pdev->dev, " %pR\n", res);
> + dev_info(&pdev->dev, "VF BAR%d: %pR (expanded to %d VFs for PE alignment)",
> + i - PCI_IOV_RESOURCES,
> + res, phb->ioda.total_pe);
> + }
> + pdn->max_vfs = phb->ioda.total_pe;
I don't think you change phb->ioda.total_pe between point A (above) and
here. Does that mean "max_vfs == 0" is some kind of flag, maybe related to
the three cases in pnv_pci_iov_resource_alignment()? Ewww!
If it doesn't change, just set "pdn->max_vfs = phb->ioda.total_pe" at
point A and be done with it.
But hopefully you can just remove this fixup path altogether.
> +}
> +
> +static void pnv_pci_ioda_fixup_sriov(struct pci_bus *bus)
> +{
> + struct pci_dev *pdev;
> + struct pci_bus *b;
> +
> + list_for_each_entry(pdev, &bus->devices, bus_list) {
> + b = pdev->subordinate;
> +
> + if (b)
> + pnv_pci_ioda_fixup_sriov(b);
> +
> + pnv_pci_ioda_fixup_iov_resources(pdev);
> + }
> +}
> +#endif /* CONFIG_PCI_IOV */
> +
> /*
> * This function is supposed to be called on basis of PE from top
> * to bottom style. So the the I/O or MMIO segment assigned to
> @@ -2097,6 +2153,9 @@ static void __init pnv_pci_init_ioda_phb(struct device_node *np,
> ppc_md.pcibios_enable_device_hook = pnv_pci_enable_device_hook;
> ppc_md.pcibios_window_alignment = pnv_pci_window_alignment;
> ppc_md.pcibios_reset_secondary_bus = pnv_pci_reset_secondary_bus;
> +#ifdef CONFIG_PCI_IOV
> + ppc_md.pcibios_fixup_sriov = pnv_pci_ioda_fixup_sriov;
> +#endif /* CONFIG_PCI_IOV */
> pci_add_flags(PCI_REASSIGN_ALL_RSRC);
>
> /* Reset IODA tables to a clean state */
> --
> 1.7.9.5
>
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