On Tue, Feb 24, 2015 at 02:35:04AM -0600, Bjorn Helgaas wrote:
> From: Wei Yang <weiy...@linux.vnet.ibm.com>
>
> M64 aperture size is limited on PHB3. When the IOV BAR is too big, this
> will exceed the limitation and failed to be assigned.
>
> Introduce a different mechanism based on the IOV BAR size:
>
> - if IOV BAR size is smaller than 64MB, expand to total_pe
> - if IOV BAR size is bigger than 64MB, roundup power2
>
> [bhelgaas: make dev_printk() output more consistent, use PCI_SRIOV_NUM_BARS]
> Signed-off-by: Wei Yang <weiy...@linux.vnet.ibm.com>
> Signed-off-by: Bjorn Helgaas <bhelg...@google.com>
> ---
> arch/powerpc/include/asm/pci-bridge.h | 2 ++
> arch/powerpc/platforms/powernv/pci-ioda.c | 33
> ++++++++++++++++++++++++++---
> 2 files changed, 32 insertions(+), 3 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/pci-bridge.h
> b/arch/powerpc/include/asm/pci-bridge.h
> index 011340df8583..d824bb184ab8 100644
> --- a/arch/powerpc/include/asm/pci-bridge.h
> +++ b/arch/powerpc/include/asm/pci-bridge.h
> @@ -179,6 +179,8 @@ struct pci_dn {
> u16 max_vfs; /* number of VFs IOV BAR expended */
> u16 vf_pes; /* VF PE# under this PF */
> int offset; /* PE# for the first VF PE */
> +#define M64_PER_IOV 4
> + int m64_per_iov;
> #define IODA_INVALID_M64 (-1)
> int m64_wins[PCI_SRIOV_NUM_BARS];
> #endif /* CONFIG_PCI_IOV */
> diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c
> b/arch/powerpc/platforms/powernv/pci-ioda.c
> index a3c2fbe35fc8..30b7c3909746 100644
> --- a/arch/powerpc/platforms/powernv/pci-ioda.c
> +++ b/arch/powerpc/platforms/powernv/pci-ioda.c
> @@ -2242,6 +2242,7 @@ static void pnv_pci_ioda_fixup_iov_resources(struct
> pci_dev *pdev)
> int i;
> resource_size_t size;
> struct pci_dn *pdn;
> + int mul, total_vfs;
>
> if (!pdev->is_physfn || pdev->is_added)
> return;
> @@ -2252,6 +2253,32 @@ static void pnv_pci_ioda_fixup_iov_resources(struct
> pci_dev *pdev)
> pdn = pci_get_pdn(pdev);
> pdn->max_vfs = 0;
>
> + total_vfs = pci_sriov_get_totalvfs(pdev);
> + pdn->m64_per_iov = 1;
> + mul = phb->ioda.total_pe;
> +
> + for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
> + res = &pdev->resource[i + PCI_IOV_RESOURCES];
> + if (!res->flags || res->parent)
> + continue;
> + if (!pnv_pci_is_mem_pref_64(res->flags)) {
> + dev_warn(&pdev->dev, " non M64 VF BAR%d: %pR\n",
> + i, res);
Why is this a dev_warn()? Can the user do anything about it? Do you want
bug reports if users see this message? There are several other instances
of this in the other patches, too.
> + continue;
> + }
> +
> + size = pci_iov_resource_size(pdev, i + PCI_IOV_RESOURCES);
> +
> + /* bigger than 64M */
> + if (size > (1 << 26)) {
> + dev_info(&pdev->dev, "PowerNV: VF BAR%d: %pR IOV size
> is bigger than 64M, roundup power2\n",
> + i, res);
> + pdn->m64_per_iov = M64_PER_IOV;
> + mul = __roundup_pow_of_two(total_vfs);
Why is this __roundup_pow_of_two() instead of roundup_pow_of_two()?
I *think* __roundup_pow_of_two() is basically a helper function for
implementing roundup_pow_of_two() and not intended to be used by itself.
I think there are other patches that use __roundup_pow_of_two(), too.
> + break;
> + }
> + }
> +
> for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
> res = &pdev->resource[i + PCI_IOV_RESOURCES];
> if (!res->flags || res->parent)
> @@ -2264,12 +2291,12 @@ static void pnv_pci_ioda_fixup_iov_resources(struct
> pci_dev *pdev)
>
> dev_dbg(&pdev->dev, " Fixing VF BAR%d: %pR to\n", i, res);
> size = pci_iov_resource_size(pdev, i + PCI_IOV_RESOURCES);
> - res->end = res->start + size * phb->ioda.total_pe - 1;
> + res->end = res->start + size * mul - 1;
> dev_dbg(&pdev->dev, " %pR\n", res);
> dev_info(&pdev->dev, "VF BAR%d: %pR (expanded to %d VFs for PE
> alignment)",
> - i, res, phb->ioda.total_pe);
> + i, res, mul);
> }
> - pdn->max_vfs = phb->ioda.total_pe;
> + pdn->max_vfs = mul;
> }
>
> static void pnv_pci_ioda_fixup_sriov(struct pci_bus *bus)
>
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