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Re: [Qemu-devel] [RFC PATCH v2 05/13] spapr_pci: Introduce a liobn numbe
From: |
Alexander Graf |
Subject: |
Re: [Qemu-devel] [RFC PATCH v2 05/13] spapr_pci: Introduce a liobn number generating macros |
Date: |
Wed, 27 Aug 2014 11:29:34 +0200 |
User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:31.0) Gecko/20100101 Thunderbird/31.0 |
On 15.08.14 12:12, Alexey Kardashevskiy wrote:
> We are going to have multiple DMA windows per PHB and we want them to
> migrate so we need a predictable way of assigning LIOBNs.
>
> This introduces a macro which makes up a LIOBN from fixed prefix,
> PHB index (unique PHB id) and window number.
>
> This introduces a SPAPR_PCI_DMA_WINDOW_NUM() to know the window number
> from LIOBN, will be used in next patch(es) to distinguish the default
> 32bit windows from dynamic windows.
>
> Signed-off-by: Alexey Kardashevskiy <address@hidden>
> ---
> hw/ppc/spapr_pci.c | 2 +-
> include/hw/ppc/spapr.h | 3 ++-
> 2 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
> index 5c46c0d..17eb0d8 100644
> --- a/hw/ppc/spapr_pci.c
> +++ b/hw/ppc/spapr_pci.c
> @@ -529,7 +529,7 @@ static void spapr_phb_realize(DeviceState *dev, Error
> **errp)
> }
>
> sphb->buid = SPAPR_PCI_BASE_BUID + sphb->index;
> - sphb->dma_liobn = SPAPR_PCI_BASE_LIOBN + sphb->index;
> + sphb->dma_liobn = SPAPR_PCI_LIOBN(sphb->index, 0);
>
> windows_base = SPAPR_PCI_WINDOW_BASE
> + sphb->index * SPAPR_PCI_WINDOW_SPACING;
> diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
> index c9d6c6c..782519a 100644
> --- a/include/hw/ppc/spapr.h
> +++ b/include/hw/ppc/spapr.h
> @@ -443,7 +443,8 @@ int spapr_rtas_device_tree_setup(void *fdt, hwaddr
> rtas_addr,
> #define SPAPR_TCE_PAGE_MASK (SPAPR_TCE_PAGE_SIZE - 1)
>
> #define SPAPR_VIO_BASE_LIOBN 0x00000000
> -#define SPAPR_PCI_BASE_LIOBN 0x80000000
> +#define SPAPR_PCI_LIOBN(i, n) (0x80000000 | ((i) << 8) | (n))
> +#define SPAPR_PCI_DMA_WINDOW_NUM(liobn) ((liobn) & 0xff)
Good idea. Mind to convert VIO as well to make them consistent?
Alex
- [Qemu-devel] [RFC PATCH v2 11/13] spapr_pci_vfio: Enable DDW, (continued)
- [Qemu-devel] [RFC PATCH v2 08/13] spapr_pci: Enable DDW, Alexey Kardashevskiy, 2014/08/15
- [Qemu-devel] [RFC PATCH v2 03/13] spapr_pci: Make find_phb()/find_dev() public, Alexey Kardashevskiy, 2014/08/15
- [Qemu-devel] [RFC PATCH v2 05/13] spapr_pci: Introduce a liobn number generating macros, Alexey Kardashevskiy, 2014/08/15
- [Qemu-devel] [RFC PATCH v2 04/13] spapr_iommu: Make spapr_tce_find_by_liobn() public, Alexey Kardashevskiy, 2014/08/15
- [Qemu-devel] [RFC PATCH v2 02/13] spapr_iommu: Disable in-kernel IOMMU tables for >4GB windows, Alexey Kardashevskiy, 2014/08/15
- [Qemu-devel] [RFC PATCH v2 10/13] linux headers update for DDW, Alexey Kardashevskiy, 2014/08/15