278 lines
8.3 KiB
C
278 lines
8.3 KiB
C
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/*
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* Copyright (C) 2012 ARM Ltd.
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* Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
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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/types.h>
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#include <linux/vmalloc.h>
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#include <asm-generic/dma-coherent.h>
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#include <asm/dma-iommu.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 dummy_dma_ops;
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extern struct dma_map_ops *dma_ops;
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extern struct dma_map_ops coherent_swiotlb_dma_ops;
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extern struct dma_map_ops noncoherent_swiotlb_dma_ops;
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extern struct dma_map_ops arm_dma_ops;
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#define PG_PROT_KERNEL PAGE_KERNEL
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#define FLUSH_TLB_PAGE(addr) flush_tlb_kernel_range(addr, PAGE_SIZE)
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#define FLUSH_DCACHE_AREA __flush_dcache_area
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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) || !dev->archdata.dma_ops)
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return dma_ops;
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else
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return dev->archdata.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 set_dma_ops(struct device *dev, struct dma_map_ops *ops)
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{
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dev->archdata.dma_ops = ops;
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}
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static inline int set_arch_dma_coherent_ops(struct device *dev)
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{
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#ifdef CONFIG_SWIOTLB
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set_dma_ops(dev, &coherent_swiotlb_dma_ops);
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#else
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BUG();
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#endif
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return 0;
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}
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#define set_arch_dma_coherent_ops set_arch_dma_coherent_ops
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void set_dummy_dma_ops(struct device *dev);
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void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
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const struct iommu_ops *iommu, bool coherent);
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#define arch_setup_dma_ops arch_setup_dma_ops
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#ifdef CONFIG_IOMMU_DMA
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void arch_teardown_dma_ops(struct device *dev);
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#define arch_teardown_dma_ops arch_teardown_dma_ops
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#endif
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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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/* do not use this function in a driver */
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static inline bool is_device_dma_noncontig(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_noncontig;
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}
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/* do not use this function in a driver */
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static inline bool skip_device_cache_sync(struct device *dev, unsigned long attrs)
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{
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if (DMA_ATTR_SKIP_CPU_SYNC & attrs)
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return true;
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return is_device_dma_coherent(dev);
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}
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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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dma_addr_t dev_addr = (dma_addr_t)paddr;
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return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
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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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phys_addr_t paddr = (phys_addr_t)dev_addr;
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return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
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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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/* Override for dma_max_pfn() */
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static inline unsigned long dma_max_pfn(struct device *dev)
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{
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dma_addr_t dma_max = (dma_addr_t)*dev->dma_mask;
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return (ulong)dma_to_phys(dev, dma_max) >> PAGE_SHIFT;
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}
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#define dma_max_pfn(dev) dma_max_pfn(dev)
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#define dma_alloc_at_coherent(d, s, h, f) dma_alloc_at_attrs(d, s, h, f, 0)
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static inline void *dma_alloc_at_attrs(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t flags,
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unsigned long attrs)
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{
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struct dma_map_ops *ops = get_dma_ops(dev);
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void *vaddr;
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vaddr = ops->alloc(dev, size, dma_handle, flags, attrs);
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debug_dma_alloc_coherent(dev, size, *dma_handle, vaddr);
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return vaddr;
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}
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/* FIXME: copied from arch/arm
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*
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* This can be called during boot to increase the size of the consistent
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* DMA region above it's default value of 2MB. It must be called before the
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* memory allocator is initialised, i.e. before any core_initcall.
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*/
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static inline void init_consistent_dma_size(unsigned long size) { }
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int arm_dma_supported(struct device *dev, u64 mask);
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/* FIXME: copied from arch/arm */
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extern int arm_dma_mapping_error(struct device *dev, dma_addr_t dev_addr);
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extern int arm_dma_set_mask(struct device *dev, u64 dma_mask);
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/**
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* arm_dma_alloc - allocate consistent memory for DMA
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* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
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* @size: required memory size
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* @handle: bus-specific DMA address
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* @attrs: optinal attributes that specific mapping properties
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*
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* Allocate some memory for a device for performing DMA. This function
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* allocates pages, and will return the CPU-viewed address, and sets @handle
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* to be the device-viewed address.
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*/
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extern void *arm_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
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gfp_t gfp, unsigned long attrs);
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/**
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* arm_dma_free - free memory allocated by arm_dma_alloc
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* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
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* @size: size of memory originally requested in dma_alloc_coherent
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* @cpu_addr: CPU-view address returned from dma_alloc_coherent
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* @handle: device-view address returned from dma_alloc_coherent
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* @attrs: optinal attributes that specific mapping properties
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*
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* Free (and unmap) a DMA buffer previously allocated by
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* arm_dma_alloc().
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*
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* References to memory and mappings associated with cpu_addr/handle
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* during and after this call executing are illegal.
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*/
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extern void arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
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dma_addr_t handle, unsigned long attrs);
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static inline dma_addr_t
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dma_map_linear_attrs(struct device *dev, phys_addr_t pa, size_t size,
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enum dma_data_direction dir, unsigned long attrs)
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{
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void *va = phys_to_virt(pa);
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struct dma_map_ops *ops = get_dma_ops(dev);
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dma_addr_t addr = DMA_ERROR_CODE;
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if (!ops || !ops->map_at) {
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WARN(1, "map_at is not supported\n");
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return DMA_ERROR_CODE;
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}
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addr = ops->map_at(dev, pa, pa, size, dir, attrs);
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if (addr != DMA_ERROR_CODE) {
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kmemcheck_mark_initialized(va, size);
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debug_dma_map_page(dev, virt_to_page(va),
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(unsigned long)va & ~PAGE_MASK, size,
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dir, addr, true);
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}
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return addr;
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}
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/**
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* arm_dma_mmap - map a coherent DMA allocation into user space
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* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
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* @vma: vm_area_struct describing requested user mapping
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* @cpu_addr: kernel CPU-view address returned from dma_alloc_coherent
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* @handle: device-view address returned from dma_alloc_coherent
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* @size: size of memory originally requested in dma_alloc_coherent
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* @attrs: optinal attributes that specific mapping properties
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*
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* Map a coherent DMA buffer previously allocated by dma_alloc_coherent
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* into user space. The coherent DMA buffer must not be freed by the
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* driver until the user space mapping has been released.
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*/
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extern int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
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void *cpu_addr, dma_addr_t dma_addr, size_t size,
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unsigned long attrs);
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extern int arm_dma_map_sg(struct device *, struct scatterlist *, int,
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enum dma_data_direction, unsigned long attrs);
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extern void arm_dma_unmap_sg(struct device *, struct scatterlist *, int,
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enum dma_data_direction, unsigned long attrs);
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extern void arm_dma_sync_sg_for_cpu(struct device *, struct scatterlist *, int,
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enum dma_data_direction);
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extern void arm_dma_sync_sg_for_device(struct device *, struct scatterlist *,
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int, enum dma_data_direction);
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extern int arm_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
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void *cpu_addr, dma_addr_t dma_addr, size_t size,
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unsigned long attrs);
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#ifdef __arch_page_to_dma
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#error Please update to __arch_pfn_to_dma
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#endif
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#define CONFIG_ARM_DMA_USE_IOMMU
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#ifdef CONFIG_ARM_DMA_USE_IOMMU
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extern bool device_is_iommuable(struct device *dev);
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#else
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static inline bool device_is_iommuable(struct device *dev)
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{
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return false;
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}
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#endif
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#endif /* __KERNEL__ */
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#endif /* __ASM_DMA_MAPPING_H */
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