From ae4de14cd36b6a899d83df9595be3971ac0802d4 Mon Sep 17 00:00:00 2001 From: Alexey Kardashevskiy Date: Mon, 4 Jul 2016 13:33:07 +1000 Subject: spapr_pci/spapr_pci_vfio: Support Dynamic DMA Windows (DDW) This adds support for Dynamic DMA Windows (DDW) option defined by the SPAPR specification which allows to have additional DMA window(s) The "ddw" property is enabled by default on a PHB but for compatibility the pseries-2.6 machine and older disable it. This also creates a single DMA window for the older machines to maintain backward migration. This implements DDW for PHB with emulated and VFIO devices. The host kernel support is required. The advertised IOMMU page sizes are 4K and 64K; 16M pages are supported but not advertised by default, in order to enable them, the user has to specify "pgsz" property for PHB and enable huge pages for RAM. The existing linux guests try creating one additional huge DMA window with 64K or 16MB pages and map the entire guest RAM to. If succeeded, the guest switches to dma_direct_ops and never calls TCE hypercalls (H_PUT_TCE,...) again. This enables VFIO devices to use the entire RAM and not waste time on map/unmap later. This adds a "dma64_win_addr" property which is a bus address for the 64bit window and by default set to 0x800.0000.0000.0000 as this is what the modern POWER8 hardware uses and this allows having emulated and VFIO devices on the same bus. This adds 4 RTAS handlers: * ibm,query-pe-dma-window * ibm,create-pe-dma-window * ibm,remove-pe-dma-window * ibm,reset-pe-dma-window These are registered from type_init() callback. These RTAS handlers are implemented in a separate file to avoid polluting spapr_iommu.c with PCI. This changes sPAPRPHBState::dma_liobn to an array to allow 2 LIOBNs and updates all references to dma_liobn. However this does not add 64bit LIOBN to the migration stream as in fact even 32bit LIOBN is rather pointless there (as it is a PHB property and the management software can/should pass LIOBNs via CLI) but we keep it for the backward migration support. Signed-off-by: Alexey Kardashevskiy Signed-off-by: David Gibson --- include/hw/ppc/spapr.h | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) (limited to 'include/hw/ppc/spapr.h') diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h index 49325555d3..2e2dd14c30 100644 --- a/include/hw/ppc/spapr.h +++ b/include/hw/ppc/spapr.h @@ -416,6 +416,16 @@ int spapr_allocate_irq_block(int num, bool lsi, bool msi); #define RTAS_OUT_NOT_AUTHORIZED -9002 #define RTAS_OUT_SYSPARM_PARAM_ERROR -9999 +/* DDW pagesize mask values from ibm,query-pe-dma-window */ +#define RTAS_DDW_PGSIZE_4K 0x01 +#define RTAS_DDW_PGSIZE_64K 0x02 +#define RTAS_DDW_PGSIZE_16M 0x04 +#define RTAS_DDW_PGSIZE_32M 0x08 +#define RTAS_DDW_PGSIZE_64M 0x10 +#define RTAS_DDW_PGSIZE_128M 0x20 +#define RTAS_DDW_PGSIZE_256M 0x40 +#define RTAS_DDW_PGSIZE_16G 0x80 + /* RTAS tokens */ #define RTAS_TOKEN_BASE 0x2000 @@ -457,8 +467,12 @@ int spapr_allocate_irq_block(int num, bool lsi, bool msi); #define RTAS_IBM_SET_SLOT_RESET (RTAS_TOKEN_BASE + 0x23) #define RTAS_IBM_CONFIGURE_PE (RTAS_TOKEN_BASE + 0x24) #define RTAS_IBM_SLOT_ERROR_DETAIL (RTAS_TOKEN_BASE + 0x25) +#define RTAS_IBM_QUERY_PE_DMA_WINDOW (RTAS_TOKEN_BASE + 0x26) +#define RTAS_IBM_CREATE_PE_DMA_WINDOW (RTAS_TOKEN_BASE + 0x27) +#define RTAS_IBM_REMOVE_PE_DMA_WINDOW (RTAS_TOKEN_BASE + 0x28) +#define RTAS_IBM_RESET_PE_DMA_WINDOW (RTAS_TOKEN_BASE + 0x29) -#define RTAS_TOKEN_MAX (RTAS_TOKEN_BASE + 0x26) +#define RTAS_TOKEN_MAX (RTAS_TOKEN_BASE + 0x2A) /* RTAS ibm,get-system-parameter token values */ #define RTAS_SYSPARM_SPLPAR_CHARACTERISTICS 20 -- cgit v1.2.3-55-g7522