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linux_dsm_epyc7002/arch/arm64/include/asm/dma-mapping.h

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 503 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Enrico Weigelt <info@metux.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190602204653.811534538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-03 12:44:50 +07:00
/* SPDX-License-Identifier: GPL-2.0-only */
arm64: DMA mapping API This patch adds support for the DMA mapping API. It uses dma_map_ops for flexibility and it currently supports swiotlb. This patch could be simplified further if the DMA accesses are coherent (not mandated by the architecture) or if corresponding hooks are placed in the generic swiotlb code to deal with cache maintenance. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2012-03-05 18:49:30 +07:00
/*
* Copyright (C) 2012 ARM Ltd.
*/
#ifndef __ASM_DMA_MAPPING_H
#define __ASM_DMA_MAPPING_H
#ifdef __KERNEL__
#include <linux/types.h>
#include <linux/vmalloc.h>
arm64/xen: get_dma_ops: return xen_dma_ops if we are running as xen_initial_domain We can't simply override arm_dma_ops with xen_dma_ops because devices are allowed to have their own dma_ops and they take precedence over arm_dma_ops. When running on Xen as initial domain, we always want xen_dma_ops to be the one in use. We introduce __generic_dma_ops to allow xen_dma_ops functions to call back to the native implementation. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> CC: will.deacon@arm.com Changes in v7: - return xen_dma_ops only if we are the initial domain; - rename __get_dma_ops to __generic_dma_ops.
2013-10-18 23:01:32 +07:00
#include <xen/xen.h>
#include <asm/xen/hypervisor.h>
xen/arm,arm64: fix xen_dma_ops after 815dd18 "Consolidate get_dma_ops..." The following commit: commit 815dd18788fe0d41899f51b91d0560279cf16b0d Author: Bart Van Assche <bart.vanassche@sandisk.com> Date: Fri Jan 20 13:04:04 2017 -0800 treewide: Consolidate get_dma_ops() implementations rearranges get_dma_ops in a way that xen_dma_ops are not returned when running on Xen anymore, dev->dma_ops is returned instead (see arch/arm/include/asm/dma-mapping.h:get_arch_dma_ops and include/linux/dma-mapping.h:get_dma_ops). Fix the problem by storing dev->dma_ops in dev_archdata, and setting dev->dma_ops to xen_dma_ops. This way, xen_dma_ops is returned naturally by get_dma_ops. The Xen code can retrieve the original dev->dma_ops from dev_archdata when needed. It also allows us to remove __generic_dma_ops from common headers. Signed-off-by: Stefano Stabellini <sstabellini@kernel.org> Tested-by: Julien Grall <julien.grall@arm.com> Suggested-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Cc: <stable@vger.kernel.org> [4.11+] CC: linux@armlinux.org.uk CC: catalin.marinas@arm.com CC: will.deacon@arm.com CC: boris.ostrovsky@oracle.com CC: jgross@suse.com CC: Julien Grall <julien.grall@arm.com>
2017-04-14 04:04:21 +07:00
static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
arm64: DMA mapping API This patch adds support for the DMA mapping API. It uses dma_map_ops for flexibility and it currently supports swiotlb. This patch could be simplified further if the DMA accesses are coherent (not mandated by the architecture) or if corresponding hooks are placed in the generic swiotlb code to deal with cache maintenance. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2012-03-05 18:49:30 +07:00
{
arm64: default to the direct mapping in get_arch_dma_ops 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>
2018-12-14 21:18:08 +07:00
return NULL;
arm64: DMA mapping API This patch adds support for the DMA mapping API. It uses dma_map_ops for flexibility and it currently supports swiotlb. This patch could be simplified further if the DMA accesses are coherent (not mandated by the architecture) or if corresponding hooks are placed in the generic swiotlb code to deal with cache maintenance. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2012-03-05 18:49:30 +07:00
}
arm64: use the generic swiotlb_dma_ops Now that the generic swiotlb code supports non-coherent DMA we can switch to it for arm64. For that we need to refactor the existing alloc/free/mmap/pgprot helpers to be used as the architecture hooks, and implement the standard arch_sync_dma_for_{device,cpu} hooks for cache maintaincance in the streaming dma hooks, which also implies using the generic dma_coherent flag in struct device. Note that we need to keep the old is_device_dma_coherent function around for now, so that the shared arm/arm64 Xen code keeps working. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2018-10-08 14:12:01 +07:00
/*
* 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.
*/
arm64: introduce is_device_dma_coherent Introduce a boolean flag and an accessor function to check whether a device is dma_coherent. Set the flag from set_arch_dma_coherent_ops. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
2014-11-20 17:41:35 +07:00
static inline bool is_device_dma_coherent(struct device *dev)
{
arm64: use the generic swiotlb_dma_ops Now that the generic swiotlb code supports non-coherent DMA we can switch to it for arm64. For that we need to refactor the existing alloc/free/mmap/pgprot helpers to be used as the architecture hooks, and implement the standard arch_sync_dma_for_{device,cpu} hooks for cache maintaincance in the streaming dma hooks, which also implies using the generic dma_coherent flag in struct device. Note that we need to keep the old is_device_dma_coherent function around for now, so that the shared arm/arm64 Xen code keeps working. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2018-10-08 14:12:01 +07:00
return dev->dma_coherent;
arm64: introduce is_device_dma_coherent Introduce a boolean flag and an accessor function to check whether a device is dma_coherent. Set the flag from set_arch_dma_coherent_ops. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
2014-11-20 17:41:35 +07:00
}
arm64: DMA mapping API This patch adds support for the DMA mapping API. It uses dma_map_ops for flexibility and it currently supports swiotlb. This patch could be simplified further if the DMA accesses are coherent (not mandated by the architecture) or if corresponding hooks are placed in the generic swiotlb code to deal with cache maintenance. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2012-03-05 18:49:30 +07:00
#endif /* __KERNEL__ */
#endif /* __ASM_DMA_MAPPING_H */
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