6894258eda
Since 2009 we have a nice asm-generic header implementing lots of DMA API functions for architectures using struct dma_map_ops, but unfortunately it's still missing a lot of APIs that all architectures still have to duplicate. This series consolidates the remaining functions, although we still need arch opt outs for two of them as a few architectures have very non-standard implementations. This patch (of 5): The coherent DMA allocator works the same over all architectures supporting dma_map operations. This patch consolidates them and converges the minor differences: - the debug_dma helpers are now called from all architectures, including those that were previously missing them - dma_alloc_from_coherent and dma_release_from_coherent are now always called from the generic alloc/free routines instead of the ops dma-mapping-common.h always includes dma-coherent.h to get the defintions for them, or the stubs if the architecture doesn't support this feature - checks for ->alloc / ->free presence are removed. There is only one magic instead of dma_map_ops without them (mic_dma_ops) and that one is x86 only anyway. Besides that only x86 needs special treatment to replace a default devices if none is passed and tweak the gfp_flags. An optional arch hook is provided for that. [linux@roeck-us.net: fix build] [jcmvbkbc@gmail.com: fix xtensa] Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Russell King <linux@arm.linux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Michal Simek <monstr@monstr.eu> Cc: Jonas Bonn <jonas@southpole.se> Cc: Chris Metcalf <cmetcalf@ezchip.com> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
137 lines
3.3 KiB
C
137 lines
3.3 KiB
C
/*
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_DMA_MAPPING_H
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#define __ASM_DMA_MAPPING_H
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#ifdef __KERNEL__
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#include <linux/acpi.h>
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#include <linux/types.h>
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#include <linux/vmalloc.h>
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#include <xen/xen.h>
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#include <asm/xen/hypervisor.h>
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#define DMA_ERROR_CODE (~(dma_addr_t)0)
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extern struct dma_map_ops *dma_ops;
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extern struct dma_map_ops dummy_dma_ops;
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static inline struct dma_map_ops *__generic_dma_ops(struct device *dev)
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{
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if (unlikely(!dev))
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return dma_ops;
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else if (dev->archdata.dma_ops)
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return dev->archdata.dma_ops;
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else if (acpi_disabled)
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return dma_ops;
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/*
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* When ACPI is enabled, if arch_set_dma_ops is not called,
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* we will disable device DMA capability by setting it
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* to dummy_dma_ops.
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*/
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return &dummy_dma_ops;
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}
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static inline struct dma_map_ops *get_dma_ops(struct device *dev)
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{
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if (xen_initial_domain())
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return xen_dma_ops;
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else
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return __generic_dma_ops(dev);
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}
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static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
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struct iommu_ops *iommu, bool coherent)
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{
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if (!acpi_disabled && !dev->archdata.dma_ops)
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dev->archdata.dma_ops = dma_ops;
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dev->archdata.dma_coherent = coherent;
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}
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#define arch_setup_dma_ops arch_setup_dma_ops
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/* do not use this function in a driver */
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static inline bool is_device_dma_coherent(struct device *dev)
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{
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if (!dev)
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return false;
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return dev->archdata.dma_coherent;
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}
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#include <asm-generic/dma-mapping-common.h>
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static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
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{
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return (dma_addr_t)paddr;
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}
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static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
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{
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return (phys_addr_t)dev_addr;
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}
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static inline int dma_mapping_error(struct device *dev, dma_addr_t dev_addr)
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{
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struct dma_map_ops *ops = get_dma_ops(dev);
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debug_dma_mapping_error(dev, dev_addr);
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return ops->mapping_error(dev, dev_addr);
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}
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static inline int dma_supported(struct device *dev, u64 mask)
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{
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struct dma_map_ops *ops = get_dma_ops(dev);
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return ops->dma_supported(dev, mask);
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}
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static inline int dma_set_mask(struct device *dev, u64 mask)
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{
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if (!dev->dma_mask || !dma_supported(dev, mask))
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return -EIO;
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*dev->dma_mask = mask;
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return 0;
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}
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static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
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{
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if (!dev->dma_mask)
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return false;
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return addr + size - 1 <= *dev->dma_mask;
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}
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static inline void dma_mark_clean(void *addr, size_t size)
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{
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}
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/*
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* There is no dma_cache_sync() implementation, so just return NULL here.
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*/
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static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
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dma_addr_t *handle, gfp_t flags)
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{
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return NULL;
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}
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static inline void dma_free_noncoherent(struct device *dev, size_t size,
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void *cpu_addr, dma_addr_t handle)
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{
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}
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#endif /* __KERNEL__ */
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#endif /* __ASM_DMA_MAPPING_H */
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