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| author | Yongji Xie <elohimes@gmail.com> | 2017-04-10 13:58:13 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2017-04-19 19:51:26 +0200 |
| commit | 382746376993cfa6d6c4e546c67384201c0f3a82 (patch) | |
| tree | f51dc2c2c9130559dd400eeed5c08304c0c371dc | |
| parent | PCI: Add pcibios_default_alignment() for arch-specific alignment control (diff) | |
| download | linux-382746376993cfa6d6c4e546c67384201c0f3a82.tar.xz linux-382746376993cfa6d6c4e546c67384201c0f3a82.zip | |
powerpc/powernv: Override pcibios_default_alignment() to force PCI devices to be page aligned
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>
| -rw-r--r-- | arch/powerpc/include/asm/machdep.h | 2 | ||||
| -rw-r--r-- | arch/powerpc/kernel/pci-common.c | 8 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/pci-ioda.c | 7 |
3 files changed, 17 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/machdep.h b/arch/powerpc/include/asm/machdep.h index 5011b69107a7..f90b22c722e1 100644 --- a/arch/powerpc/include/asm/machdep.h +++ b/arch/powerpc/include/asm/machdep.h @@ -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); diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c index ffda24a38dda..03a7c9f58126 100644 --- a/arch/powerpc/kernel/pci-common.c +++ b/arch/powerpc/kernel/pci-common.c @@ -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) { diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c index 6901a06da2f9..0529d5630afd 100644 --- a/arch/powerpc/platforms/powernv/pci-ioda.c +++ b/arch/powerpc/platforms/powernv/pci-ioda.c @@ -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; |