~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/arm/include/asm/dma-mapping.h

Version: ~ [ linux-6.1-rc7 ] ~ [ linux-6.0.10 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.80 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.156 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.225 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.267 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.300 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.334 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef ASMARM_DMA_MAPPING_H
  3 #define ASMARM_DMA_MAPPING_H
  4 
  5 #ifdef __KERNEL__
  6 
  7 #include <linux/mm_types.h>
  8 #include <linux/scatterlist.h>
  9 #include <linux/dma-debug.h>
 10 
 11 #include <asm/memory.h>
 12 
 13 #include <xen/xen.h>
 14 #include <asm/xen/hypervisor.h>
 15 
 16 extern const struct dma_map_ops arm_dma_ops;
 17 extern const struct dma_map_ops arm_coherent_dma_ops;
 18 
 19 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 20 {
 21         return IS_ENABLED(CONFIG_MMU) ? &arm_dma_ops : &dma_noop_ops;
 22 }
 23 
 24 #ifdef __arch_page_to_dma
 25 #error Please update to __arch_pfn_to_dma
 26 #endif
 27 
 28 /*
 29  * dma_to_pfn/pfn_to_dma/dma_to_virt/virt_to_dma are architecture private
 30  * functions used internally by the DMA-mapping API to provide DMA
 31  * addresses. They must not be used by drivers.
 32  */
 33 #ifndef __arch_pfn_to_dma
 34 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
 35 {
 36         if (dev)
 37                 pfn -= dev->dma_pfn_offset;
 38         return (dma_addr_t)__pfn_to_bus(pfn);
 39 }
 40 
 41 static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
 42 {
 43         unsigned long pfn = __bus_to_pfn(addr);
 44 
 45         if (dev)
 46                 pfn += dev->dma_pfn_offset;
 47 
 48         return pfn;
 49 }
 50 
 51 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
 52 {
 53         if (dev) {
 54                 unsigned long pfn = dma_to_pfn(dev, addr);
 55 
 56                 return phys_to_virt(__pfn_to_phys(pfn));
 57         }
 58 
 59         return (void *)__bus_to_virt((unsigned long)addr);
 60 }
 61 
 62 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
 63 {
 64         if (dev)
 65                 return pfn_to_dma(dev, virt_to_pfn(addr));
 66 
 67         return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
 68 }
 69 
 70 #else
 71 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
 72 {
 73         return __arch_pfn_to_dma(dev, pfn);
 74 }
 75 
 76 static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
 77 {
 78         return __arch_dma_to_pfn(dev, addr);
 79 }
 80 
 81 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
 82 {
 83         return __arch_dma_to_virt(dev, addr);
 84 }
 85 
 86 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
 87 {
 88         return __arch_virt_to_dma(dev, addr);
 89 }
 90 #endif
 91 
 92 /* The ARM override for dma_max_pfn() */
 93 static inline unsigned long dma_max_pfn(struct device *dev)
 94 {
 95         return dma_to_pfn(dev, *dev->dma_mask);
 96 }
 97 #define dma_max_pfn(dev) dma_max_pfn(dev)
 98 
 99 #define arch_setup_dma_ops arch_setup_dma_ops
100 extern void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
101                                const struct iommu_ops *iommu, bool coherent);
102 
103 #define arch_teardown_dma_ops arch_teardown_dma_ops
104 extern void arch_teardown_dma_ops(struct device *dev);
105 
106 /* do not use this function in a driver */
107 static inline bool is_device_dma_coherent(struct device *dev)
108 {
109         return dev->archdata.dma_coherent;
110 }
111 
112 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
113 {
114         unsigned int offset = paddr & ~PAGE_MASK;
115         return pfn_to_dma(dev, __phys_to_pfn(paddr)) + offset;
116 }
117 
118 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
119 {
120         unsigned int offset = dev_addr & ~PAGE_MASK;
121         return __pfn_to_phys(dma_to_pfn(dev, dev_addr)) + offset;
122 }
123 
124 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
125 {
126         u64 limit, mask;
127 
128         if (!dev->dma_mask)
129                 return 0;
130 
131         mask = *dev->dma_mask;
132 
133         limit = (mask + 1) & ~mask;
134         if (limit && size > limit)
135                 return 0;
136 
137         if ((addr | (addr + size - 1)) & ~mask)
138                 return 0;
139 
140         return 1;
141 }
142 
143 static inline void dma_mark_clean(void *addr, size_t size) { }
144 
145 /**
146  * arm_dma_alloc - allocate consistent memory for DMA
147  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
148  * @size: required memory size
149  * @handle: bus-specific DMA address
150  * @attrs: optinal attributes that specific mapping properties
151  *
152  * Allocate some memory for a device for performing DMA.  This function
153  * allocates pages, and will return the CPU-viewed address, and sets @handle
154  * to be the device-viewed address.
155  */
156 extern void *arm_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
157                            gfp_t gfp, unsigned long attrs);
158 
159 /**
160  * arm_dma_free - free memory allocated by arm_dma_alloc
161  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
162  * @size: size of memory originally requested in dma_alloc_coherent
163  * @cpu_addr: CPU-view address returned from dma_alloc_coherent
164  * @handle: device-view address returned from dma_alloc_coherent
165  * @attrs: optinal attributes that specific mapping properties
166  *
167  * Free (and unmap) a DMA buffer previously allocated by
168  * arm_dma_alloc().
169  *
170  * References to memory and mappings associated with cpu_addr/handle
171  * during and after this call executing are illegal.
172  */
173 extern void arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
174                          dma_addr_t handle, unsigned long attrs);
175 
176 /**
177  * arm_dma_mmap - map a coherent DMA allocation into user space
178  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
179  * @vma: vm_area_struct describing requested user mapping
180  * @cpu_addr: kernel CPU-view address returned from dma_alloc_coherent
181  * @handle: device-view address returned from dma_alloc_coherent
182  * @size: size of memory originally requested in dma_alloc_coherent
183  * @attrs: optinal attributes that specific mapping properties
184  *
185  * Map a coherent DMA buffer previously allocated by dma_alloc_coherent
186  * into user space.  The coherent DMA buffer must not be freed by the
187  * driver until the user space mapping has been released.
188  */
189 extern int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
190                         void *cpu_addr, dma_addr_t dma_addr, size_t size,
191                         unsigned long attrs);
192 
193 /*
194  * For SA-1111, IXP425, and ADI systems  the dma-mapping functions are "magic"
195  * and utilize bounce buffers as needed to work around limited DMA windows.
196  *
197  * On the SA-1111, a bug limits DMA to only certain regions of RAM.
198  * On the IXP425, the PCI inbound window is 64MB (256MB total RAM)
199  * On some ADI engineering systems, PCI inbound window is 32MB (12MB total RAM)
200  *
201  * The following are helper functions used by the dmabounce subystem
202  *
203  */
204 
205 /**
206  * dmabounce_register_dev
207  *
208  * @dev: valid struct device pointer
209  * @small_buf_size: size of buffers to use with small buffer pool
210  * @large_buf_size: size of buffers to use with large buffer pool (can be 0)
211  * @needs_bounce_fn: called to determine whether buffer needs bouncing
212  *
213  * This function should be called by low-level platform code to register
214  * a device as requireing DMA buffer bouncing. The function will allocate
215  * appropriate DMA pools for the device.
216  */
217 extern int dmabounce_register_dev(struct device *, unsigned long,
218                 unsigned long, int (*)(struct device *, dma_addr_t, size_t));
219 
220 /**
221  * dmabounce_unregister_dev
222  *
223  * @dev: valid struct device pointer
224  *
225  * This function should be called by low-level platform code when device
226  * that was previously registered with dmabounce_register_dev is removed
227  * from the system.
228  *
229  */
230 extern void dmabounce_unregister_dev(struct device *);
231 
232 
233 
234 /*
235  * The scatter list versions of the above methods.
236  */
237 extern int arm_dma_map_sg(struct device *, struct scatterlist *, int,
238                 enum dma_data_direction, unsigned long attrs);
239 extern void arm_dma_unmap_sg(struct device *, struct scatterlist *, int,
240                 enum dma_data_direction, unsigned long attrs);
241 extern void arm_dma_sync_sg_for_cpu(struct device *, struct scatterlist *, int,
242                 enum dma_data_direction);
243 extern void arm_dma_sync_sg_for_device(struct device *, struct scatterlist *, int,
244                 enum dma_data_direction);
245 extern int arm_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
246                 void *cpu_addr, dma_addr_t dma_addr, size_t size,
247                 unsigned long attrs);
248 
249 #endif /* __KERNEL__ */
250 #endif
251 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp