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powerpc/powernv: Implement pcibios_iov_resource_alignment() on powernv 

Implement pcibios_iov_resource_alignment() on powernv platform.

On PowerNV platform, there are 3 cases for the IOV BAR:
1. initial state, the IOV BAR size is multiple times of VF BAR size
2. after expanded, the IOV BAR size is expanded to meet the M64 segment size
3. sizing stage, the IOV BAR is truncated to 0

pnv_pci_iov_resource_alignment() handle these three cases respectively.

[bhelgaas: adjust to drop "align" parameter, return pci_iov_resource_size()
if no ppc_md machdep_call version]
Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Wei Yang 2015-03-25 16:23:56 +08:00 committed by Benjamin Herrenschmidt
parent 6e628c7d33
commit 5350ab3fd7
3 changed files with 31 additions and 0 deletions
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1
arch/powerpc/include/asm/machdep.h
View File

@ -252,6 +252,7 @@ struct machdep_calls {
#ifdef CONFIG_PCI_IOV
void (*pcibios_fixup_sriov)(struct pci_dev *pdev);
resource_size_t (*pcibios_iov_resource_alignment)(struct pci_dev *, int resno);
#endif /* CONFIG_PCI_IOV */
/* Called to shutdown machine specific hardware not already controlled

10
arch/powerpc/kernel/pci-common.c
View File

@ -130,6 +130,16 @@ void pcibios_reset_secondary_bus(struct pci_dev *dev)
pci_reset_secondary_bus(dev);
}
#ifdef CONFIG_PCI_IOV
resource_size_t pcibios_iov_resource_alignment(struct pci_dev *pdev, int resno)
{
if (ppc_md.pcibios_iov_resource_alignment)
return ppc_md.pcibios_iov_resource_alignment(pdev, resno);
return pci_iov_resource_size(pdev, resno);
}
#endif /* CONFIG_PCI_IOV */
static resource_size_t pcibios_io_size(const struct pci_controller *hose)
{
#ifdef CONFIG_PPC64

20
arch/powerpc/platforms/powernv/pci-ioda.c
View File

@ -1965,6 +1965,25 @@ static resource_size_t pnv_pci_window_alignment(struct pci_bus *bus,
return phb->ioda.io_segsize;
}
#ifdef CONFIG_PCI_IOV
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;
align = pci_iov_resource_size(pdev, resno);
if (pdn->vfs_expanded)
return pdn->vfs_expanded * align;
return align;
}
#endif /* CONFIG_PCI_IOV */
/* Prevent enabling devices for which we couldn't properly
* assign a PE
*/
@ -2164,6 +2183,7 @@ static void __init pnv_pci_init_ioda_phb(struct device_node *np,
ppc_md.pcibios_reset_secondary_bus = pnv_pci_reset_secondary_bus;
#ifdef CONFIG_PCI_IOV
ppc_md.pcibios_fixup_sriov = pnv_pci_ioda_fixup_iov_resources;
ppc_md.pcibios_iov_resource_alignment = pnv_pci_iov_resource_alignment;
#endif /* CONFIG_PCI_IOV */
pci_add_flags(PCI_REASSIGN_ALL_RSRC);