forked from mirrors/linux
035e3a4321
This is needed to avoid having to parse the same device-tree several times for a given device. For this to work we need to install the xen_virtio_restricted_mem_acc callback in Arm's xen_guest_init() which is same callback as x86's PV and HVM modes already use and remove the manual assignment in xen_setup_dma_ops(). Also we need to split the code to initialize backend_domid into a separate function. Prior to current patch we parsed the device-tree three times: 1. xen_setup_dma_ops()->...->xen_is_dt_grant_dma_device() 2. xen_setup_dma_ops()->...->xen_dt_grant_init_backend_domid() 3. xen_virtio_mem_acc()->...->xen_is_dt_grant_dma_device() With current patch we parse the device-tree only once in xen_virtio_restricted_mem_acc()->...->xen_dt_grant_init_backend_domid() Other benefits are: - Not diverge from x86 when setting up Xen grant DMA ops - Drop several global functions Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> Reviewed-by: Xenia Ragiadakou <burzalodowa@gmail.com> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> Link: https://lore.kernel.org/r/20221025162004.8501-2-olekstysh@gmail.com Signed-off-by: Juergen Gross <jgross@suse.com>
16 lines
334 B
C
16 lines
334 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_ARM_XEN_OPS_H
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#define _ASM_ARM_XEN_OPS_H
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#include <xen/swiotlb-xen.h>
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#include <xen/xen-ops.h>
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static inline void xen_setup_dma_ops(struct device *dev)
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{
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#ifdef CONFIG_XEN
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if (xen_swiotlb_detect())
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dev->dma_ops = &xen_swiotlb_dma_ops;
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#endif
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}
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#endif /* _ASM_ARM_XEN_OPS_H */
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