mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 03:05:21 +07:00
9ab91e7c5c
Otherwise the direct mapping won't work at all given that a NULL
dev->dma_ops causes a fallback. Note that we already explicitly set
dev->dma_ops to dma_dummy_ops for dma-incapable devices, so this
fallback should not be needed anyway.
Fixes: 356da6d0cd ("dma-mapping: bypass indirect calls for dma-direct")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
/*
|
|
* Copyright (C) 2012 ARM Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#ifndef __ASM_DMA_MAPPING_H
|
|
#define __ASM_DMA_MAPPING_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/vmalloc.h>
|
|
|
|
#include <xen/xen.h>
|
|
#include <asm/xen/hypervisor.h>
|
|
|
|
static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
|
|
const struct iommu_ops *iommu, bool coherent);
|
|
#define arch_setup_dma_ops arch_setup_dma_ops
|
|
|
|
#ifdef CONFIG_IOMMU_DMA
|
|
void arch_teardown_dma_ops(struct device *dev);
|
|
#define arch_teardown_dma_ops arch_teardown_dma_ops
|
|
#endif
|
|
|
|
/*
|
|
* Do not use this function in a driver, it is only provided for
|
|
* arch/arm/mm/xen.c, which is used by arm64 as well.
|
|
*/
|
|
static inline bool is_device_dma_coherent(struct device *dev)
|
|
{
|
|
return dev->dma_coherent;
|
|
}
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* __ASM_DMA_MAPPING_H */
|