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arm/xen: Introduce xen_setup_dma_ops()

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This patch introduces new helper and places it in new header.
The helper's purpose is to assign any Xen specific DMA ops in
a single place. For now, we deal with xen-swiotlb DMA ops only.
The one of the subsequent commits in current series will add
xen-grant DMA ops case.

Also re-use the xen_swiotlb_detect() check on Arm32.

Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
[For arm64]
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/1654197833-25362-2-git-send-email-olekstysh@gmail.com
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Oleksandr Tyshchenko 2022-06-02 22:23:46 +03:00 committed by Juergen Gross
parent 3f9dfbebdc
commit 9bf22421dc
5 changed files with 23 additions and 10 deletions
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2
arch/arm/include/asm/xen/xen-ops.h Normal file
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@ -0,0 +1,2 @@
/* SPDX-License-Identifier: GPL-2.0 */
#include <xen/arm/xen-ops.h>

7
arch/arm/mm/dma-mapping.c
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@ -33,7 +33,7 @@
#include <asm/dma-iommu.h>
#include <asm/mach/map.h>
#include <asm/system_info.h>
#include <xen/swiotlb-xen.h>
#include <asm/xen/xen-ops.h>
#include "dma.h"
#include "mm.h"
@ -2287,10 +2287,7 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
set_dma_ops(dev, dma_ops);
#ifdef CONFIG_XEN
if (xen_initial_domain())
dev->dma_ops = &xen_swiotlb_dma_ops;
#endif
xen_setup_dma_ops(dev);
dev->archdata.dma_ops_setup = true;
}

2
arch/arm64/include/asm/xen/xen-ops.h Normal file
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@ -0,0 +1,2 @@
/* SPDX-License-Identifier: GPL-2.0 */
#include <xen/arm/xen-ops.h>

7
arch/arm64/mm/dma-mapping.c
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@ -9,9 +9,9 @@
#include <linux/dma-map-ops.h>
#include <linux/dma-iommu.h>
#include <xen/xen.h>
#include <xen/swiotlb-xen.h>
#include <asm/cacheflush.h>
#include <asm/xen/xen-ops.h>
void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
enum dma_data_direction dir)
@ -52,8 +52,5 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
if (iommu)
iommu_setup_dma_ops(dev, dma_base, dma_base + size - 1);
#ifdef CONFIG_XEN
if (xen_swiotlb_detect())
dev->dma_ops = &xen_swiotlb_dma_ops;
#endif
xen_setup_dma_ops(dev);
}

15
include/xen/arm/xen-ops.h Normal file
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@ -0,0 +1,15 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_ARM_XEN_OPS_H
#define _ASM_ARM_XEN_OPS_H
#include <xen/swiotlb-xen.h>
static inline void xen_setup_dma_ops(struct device *dev)
{
#ifdef CONFIG_XEN
if (xen_swiotlb_detect())
dev->dma_ops = &xen_swiotlb_dma_ops;
#endif
}
#endif /* _ASM_ARM_XEN_OPS_H */