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Date: Tue, 27 Jul 2010 13:00:01 -0400 From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> To: linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org Cc: Jeremy Fitzhardinge <jeremy@...p.org>, alex.williamson@...hat.com, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>, FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>, Albert Herranz <albert_herranz@...oo.es>, Ian Campbell <Ian.Campbell@...rix.com> Subject: [PATCH 8/9] pci-swiotlb-xen: Add glue code to setup dma_ops utilizing xen_swiotlb_* functions. We add the glue code that sets up a dma_ops structure with the xen_swiotlb_* functions. The code turns on xen_swiotlb flag when it detects it is running under Xen and it is either in privileged mode or the iommu=soft flag was passed in. It also disables the bare-metal SWIOTLB if the Xen-SWIOTLB has been enabled. Note: The Xen-SWIOTLB is only built when CONFIG_XEN is enabled. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com> Cc: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> Cc: Albert Herranz <albert_herranz@...oo.es> Cc: Ian Campbell <Ian.Campbell@...rix.com> --- arch/x86/include/asm/xen/swiotlb-xen.h | 14 ++++++++ arch/x86/xen/Makefile | 1 + arch/x86/xen/pci-swiotlb-xen.c | 58 ++++++++++++++++++++++++++++++++ 3 files changed, 73 insertions(+), 0 deletions(-) create mode 100644 arch/x86/include/asm/xen/swiotlb-xen.h create mode 100644 arch/x86/xen/pci-swiotlb-xen.c diff --git a/arch/x86/include/asm/xen/swiotlb-xen.h b/arch/x86/include/asm/xen/swiotlb-xen.h new file mode 100644 index 0000000..1be1ab7 --- /dev/null +++ b/arch/x86/include/asm/xen/swiotlb-xen.h @@ -0,0 +1,14 @@ +#ifndef _ASM_X86_SWIOTLB_XEN_H +#define _ASM_X86_SWIOTLB_XEN_H + +#ifdef CONFIG_SWIOTLB_XEN +extern int xen_swiotlb; +extern int __init pci_xen_swiotlb_detect(void); +extern void __init pci_xen_swiotlb_init(void); +#else +#define xen_swiotlb (0) +static inline int __init pci_xen_swiotlb_detect(void) { return 0; } +static inline void __init pci_xen_swiotlb_init(void) { } +#endif + +#endif /* _ASM_X86_SWIOTLB_XEN_H */ diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile index 3bb4fc2..32af238 100644 --- a/arch/x86/xen/Makefile +++ b/arch/x86/xen/Makefile @@ -18,3 +18,4 @@ obj-$(CONFIG_SMP) += smp.o obj-$(CONFIG_PARAVIRT_SPINLOCKS)+= spinlock.o obj-$(CONFIG_XEN_DEBUG_FS) += debugfs.o +obj-$(CONFIG_SWIOTLB_XEN) += pci-swiotlb-xen.o diff --git a/arch/x86/xen/pci-swiotlb-xen.c b/arch/x86/xen/pci-swiotlb-xen.c new file mode 100644 index 0000000..a013ec9 --- /dev/null +++ b/arch/x86/xen/pci-swiotlb-xen.c @@ -0,0 +1,58 @@ +/* Glue code to lib/swiotlb-xen.c */ + +#include <linux/dma-mapping.h> +#include <xen/swiotlb-xen.h> + +#include <asm/xen/hypervisor.h> +#include <xen/xen.h> + +int xen_swiotlb __read_mostly; + +static struct dma_map_ops xen_swiotlb_dma_ops = { + .mapping_error = xen_swiotlb_dma_mapping_error, + .alloc_coherent = xen_swiotlb_alloc_coherent, + .free_coherent = xen_swiotlb_free_coherent, + .sync_single_for_cpu = xen_swiotlb_sync_single_for_cpu, + .sync_single_for_device = xen_swiotlb_sync_single_for_device, + .sync_sg_for_cpu = xen_swiotlb_sync_sg_for_cpu, + .sync_sg_for_device = xen_swiotlb_sync_sg_for_device, + .map_sg = xen_swiotlb_map_sg_attrs, + .unmap_sg = xen_swiotlb_unmap_sg_attrs, + .map_page = xen_swiotlb_map_page, + .unmap_page = xen_swiotlb_unmap_page, + .dma_supported = xen_swiotlb_dma_supported, +}; + +/* + * pci_xen_swiotlb_detect - set xen_swiotlb to 1 if necessary + * + * This returns non-zero if we are forced to use xen_swiotlb (by the boot + * option). + */ +int __init pci_xen_swiotlb_detect(void) +{ + + /* If running as PV guest, either iommu=soft, or swiotlb=force will + * activate this IOMMU. If running as PV privileged, activate it + * irregardlesss. + */ + if ((xen_initial_domain() || swiotlb || swiotlb_force) && + (xen_pv_domain())) + xen_swiotlb = 1; + + /* If we are running under Xen, we MUST disable the native SWIOTLB. + * Don't worry about swiotlb_force flag activating the native, as + * the 'swiotlb' flag is the only one turning it on. */ + if (xen_pv_domain()) + swiotlb = 0; + + return xen_swiotlb; +} + +void __init pci_xen_swiotlb_init(void) +{ + if (xen_swiotlb) { + xen_swiotlb_init(1); + dma_ops = &xen_swiotlb_dma_ops; + } +} -- 1.7.0.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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