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powerpc/powernv: simplify the calculation of iov resource alignment

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The alignment of IOV BAR on PowerNV platform is the total size of the IOV
BAR. No matter whether the IOV BAR is extended with number of
roundup_pow_of_two(total_vfs) or number of max PE number (256), the total
size could be calculated by (vfs_expanded * VF_BAR_size).

This patch simplifies the pnv_pci_iov_resource_alignment() by removing the
first case.

Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Acked-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Wei Yang 2015-10-22 09:22:15 +08:00 committed by Michael Ellerman
parent b033185419
commit 7fbe7a9374
1 changed files with 12 additions and 8 deletions
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20
arch/powerpc/platforms/powernv/pci-ioda.c
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@ -3129,17 +3129,21 @@ static resource_size_t pnv_pci_iov_resource_alignment(struct pci_dev *pdev,
int resno)
{
struct pci_dn *pdn = pci_get_pdn(pdev);
resource_size_t align, iov_align;
iov_align = resource_size(&pdev->resource[resno]);
if (iov_align)
return iov_align;
resource_size_t align;
/*
* On PowerNV platform, IOV BAR is mapped by M64 BAR to enable the
* SR-IOV. While from hardware perspective, the range mapped by M64
* BAR should be size aligned.
*
* This function returns the total IOV BAR size if M64 BAR is in
* Shared PE mode or just VF BAR size if not.
*/
align = pci_iov_resource_size(pdev, resno);
if (pdn->vfs_expanded)
return pdn->vfs_expanded * align;
if (!pdn->vfs_expanded)
return align;
return align;
return pdn->vfs_expanded * align;
}
#endif /* CONFIG_PCI_IOV */