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SubjectRe: [PATCH 2/3] device_isolation: Support isolation on POWER p5ioc2 bridges
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On Wed, 2012-02-01 at 15:46 +1100, David Gibson wrote:
> This patch adds code to the code for the powernv platform to create
> and populate isolation groups on hardware using the p5ioc2 PCI host
> bridge used on some IBM POWER systems.
>
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> ---
> arch/powerpc/platforms/powernv/pci-p5ioc2.c | 14 +++++++++++++-
> arch/powerpc/platforms/powernv/pci.h | 3 +++
> 2 files changed, 16 insertions(+), 1 deletions(-)
>
> diff --git a/arch/powerpc/platforms/powernv/pci-p5ioc2.c b/arch/powerpc/platforms/powernv/pci-p5ioc2.c
> index 2649677..e5bb3a6 100644
> --- a/arch/powerpc/platforms/powernv/pci-p5ioc2.c
> +++ b/arch/powerpc/platforms/powernv/pci-p5ioc2.c
> @@ -20,6 +20,7 @@
> #include <linux/irq.h>
> #include <linux/io.h>
> #include <linux/msi.h>
> +#include <linux/device_isolation.h>
>
> #include <asm/sections.h>
> #include <asm/io.h>
> @@ -88,10 +89,21 @@ static void pnv_pci_init_p5ioc2_msis(struct pnv_phb *phb) { }
> static void __devinit pnv_pci_p5ioc2_dma_dev_setup(struct pnv_phb *phb,
> struct pci_dev *pdev)
> {
> - if (phb->p5ioc2.iommu_table.it_map == NULL)
> + if (phb->p5ioc2.iommu_table.it_map == NULL) {
> iommu_init_table(&phb->p5ioc2.iommu_table, phb->hose->node);
> +#ifdef CONFIG_DEVICE_ISOLATION
> + phb->p5ioc2.di_group = kzalloc(sizeof(*(phb->p5ioc2.di_group)),
> + GFP_KERNEL);
> + BUG_ON(!phb->p5ioc2.di_group ||
> + (device_isolation_group_init(phb->p5ioc2.di_group,
> + "p5ioc2:%llx", phb->opal_id) < 0));
> +#endif

Hmm, it's really unfortunate that this is architected so we need to
surround everything in #ifdefs even though we have stub functions
defined.

> + }
>
> set_iommu_table_base(&pdev->dev, &phb->p5ioc2.iommu_table);
> +#ifdef CONFIG_DEVICE_ISOLATION
> + device_isolation_dev_add(phb->p5ioc2.di_group, &pdev->dev);
> +#endif
> }
>
> static void __init pnv_pci_init_p5ioc2_phb(struct device_node *np,
> diff --git a/arch/powerpc/platforms/powernv/pci.h b/arch/powerpc/platforms/powernv/pci.h
> index 8bc4796..64ede1e 100644
> --- a/arch/powerpc/platforms/powernv/pci.h
> +++ b/arch/powerpc/platforms/powernv/pci.h
> @@ -87,6 +87,9 @@ struct pnv_phb {
> union {
> struct {
> struct iommu_table iommu_table;
> +#ifdef CONFIG_DEVICE_ISOLATION
> + struct device_isolation_group *di_group;
> +#endif
> } p5ioc2;
>
> struct {





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