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powerpc/powernv: Override pcibios_default_alignment() to force PCI devices to be page aligned

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Override pcibios_default_alignment() to set default alignment to PAGE_SIZE
for all PCI devices on PowerNV platform.  Thus sub-page BARs would not
share a page and could be mapped into guest when VFIO passthrough them.

Signed-off-by: Yongji Xie <elohimes@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Yongji Xie 2017-04-10 19:58:13 +08:00 committed by Bjorn Helgaas
parent 0a701aa637
commit 3827463769
3 changed files with 17 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
arch/powerpc/include/asm/machdep.h
View file

@ -173,6 +173,8 @@ struct machdep_calls {
/* Called after scan and before resource survey */
void (*pcibios_fixup_phb)(struct pci_controller *hose);
resource_size_t (*pcibios_default_alignment)(void);
#ifdef CONFIG_PCI_IOV
void (*pcibios_fixup_sriov)(struct pci_dev *pdev);
resource_size_t (*pcibios_iov_resource_alignment)(struct pci_dev *, int resno);

8
arch/powerpc/kernel/pci-common.c
View file

@ -233,6 +233,14 @@ void pcibios_reset_secondary_bus(struct pci_dev *dev)
pci_reset_secondary_bus(dev);
}
resource_size_t pcibios_default_alignment(void)
{
if (ppc_md.pcibios_default_alignment)
return ppc_md.pcibios_default_alignment();
return 0;
}
#ifdef CONFIG_PCI_IOV
resource_size_t pcibios_iov_resource_alignment(struct pci_dev *pdev, int resno)
{

7
arch/powerpc/platforms/powernv/pci-ioda.c
View file

@ -3287,6 +3287,11 @@ static void pnv_pci_setup_bridge(struct pci_bus *bus, unsigned long type)
}
}
static resource_size_t pnv_pci_default_alignment(void)
{
return PAGE_SIZE;
}
#ifdef CONFIG_PCI_IOV
static resource_size_t pnv_pci_iov_resource_alignment(struct pci_dev *pdev,
int resno)
@ -3820,6 +3825,8 @@ static void __init pnv_pci_init_ioda_phb(struct device_node *np,
hose->controller_ops = pnv_pci_ioda_controller_ops;
}
ppc_md.pcibios_default_alignment = pnv_pci_default_alignment;
#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;