193 строки
5.7 KiB
C
193 строки
5.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_SWIOTLB_H
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#define __LINUX_SWIOTLB_H
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#include <linux/device.h>
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#include <linux/dma-direction.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/limits.h>
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#include <linux/spinlock.h>
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struct device;
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struct page;
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struct scatterlist;
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#define SWIOTLB_VERBOSE (1 << 0) /* verbose initialization */
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#define SWIOTLB_FORCE (1 << 1) /* force bounce buffering */
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#define SWIOTLB_ANY (1 << 2) /* allow any memory for the buffer */
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/*
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* Maximum allowable number of contiguous slabs to map,
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* must be a power of 2. What is the appropriate value ?
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* The complexity of {map,unmap}_single is linearly dependent on this value.
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*/
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#define IO_TLB_SEGSIZE 128
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/*
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* log of the size of each IO TLB slab. The number of slabs is command line
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* controllable.
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*/
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#define IO_TLB_SHIFT 11
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#define IO_TLB_SIZE (1 << IO_TLB_SHIFT)
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/* default to 64MB */
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#define IO_TLB_DEFAULT_SIZE (64UL<<20)
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unsigned long swiotlb_size_or_default(void);
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void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
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int (*remap)(void *tlb, unsigned long nslabs));
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int swiotlb_init_late(size_t size, gfp_t gfp_mask,
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int (*remap)(void *tlb, unsigned long nslabs));
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extern void __init swiotlb_update_mem_attributes(void);
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phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t phys,
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size_t mapping_size, size_t alloc_size,
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unsigned int alloc_aligned_mask, enum dma_data_direction dir,
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unsigned long attrs);
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extern void swiotlb_tbl_unmap_single(struct device *hwdev,
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phys_addr_t tlb_addr,
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size_t mapping_size,
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enum dma_data_direction dir,
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unsigned long attrs);
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void swiotlb_sync_single_for_device(struct device *dev, phys_addr_t tlb_addr,
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size_t size, enum dma_data_direction dir);
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void swiotlb_sync_single_for_cpu(struct device *dev, phys_addr_t tlb_addr,
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size_t size, enum dma_data_direction dir);
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dma_addr_t swiotlb_map(struct device *dev, phys_addr_t phys,
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size_t size, enum dma_data_direction dir, unsigned long attrs);
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#ifdef CONFIG_SWIOTLB
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/**
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* struct io_tlb_mem - IO TLB Memory Pool Descriptor
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*
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* @start: The start address of the swiotlb memory pool. Used to do a quick
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* range check to see if the memory was in fact allocated by this
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* API.
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* @end: The end address of the swiotlb memory pool. Used to do a quick
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* range check to see if the memory was in fact allocated by this
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* API.
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* @vaddr: The vaddr of the swiotlb memory pool. The swiotlb memory pool
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* may be remapped in the memory encrypted case and store virtual
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* address for bounce buffer operation.
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* @nslabs: The number of IO TLB blocks (in groups of 64) between @start and
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* @end. For default swiotlb, this is command line adjustable via
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* setup_io_tlb_npages.
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* @used: The number of used IO TLB block.
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* @list: The free list describing the number of free entries available
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* from each index.
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* @orig_addr: The original address corresponding to a mapped entry.
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* @alloc_size: Size of the allocated buffer.
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* @debugfs: The dentry to debugfs.
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* @late_alloc: %true if allocated using the page allocator
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* @force_bounce: %true if swiotlb bouncing is forced
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* @for_alloc: %true if the pool is used for memory allocation
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* @nareas: The area number in the pool.
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* @area_nslabs: The slot number in the area.
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* @total_used: The total number of slots in the pool that are currently used
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* across all areas. Used only for calculating used_hiwater in
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* debugfs.
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* @used_hiwater: The high water mark for total_used. Used only for reporting
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* in debugfs.
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*/
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struct io_tlb_mem {
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phys_addr_t start;
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phys_addr_t end;
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void *vaddr;
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unsigned long nslabs;
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unsigned long used;
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struct dentry *debugfs;
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bool late_alloc;
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bool force_bounce;
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bool for_alloc;
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unsigned int nareas;
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unsigned int area_nslabs;
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struct io_tlb_area *areas;
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struct io_tlb_slot *slots;
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#ifdef CONFIG_DEBUG_FS
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atomic_long_t total_used;
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atomic_long_t used_hiwater;
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#endif
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};
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extern struct io_tlb_mem io_tlb_default_mem;
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static inline bool is_swiotlb_buffer(struct device *dev, phys_addr_t paddr)
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{
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struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
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return mem && paddr >= mem->start && paddr < mem->end;
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}
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static inline bool is_swiotlb_force_bounce(struct device *dev)
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{
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struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
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return mem && mem->force_bounce;
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}
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void swiotlb_init(bool addressing_limited, unsigned int flags);
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void __init swiotlb_exit(void);
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size_t swiotlb_max_mapping_size(struct device *dev);
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bool is_swiotlb_active(struct device *dev);
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void __init swiotlb_adjust_size(unsigned long size);
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#else
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static inline void swiotlb_init(bool addressing_limited, unsigned int flags)
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{
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}
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static inline bool is_swiotlb_buffer(struct device *dev, phys_addr_t paddr)
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{
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return false;
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}
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static inline bool is_swiotlb_force_bounce(struct device *dev)
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{
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return false;
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}
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static inline void swiotlb_exit(void)
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{
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}
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static inline size_t swiotlb_max_mapping_size(struct device *dev)
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{
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return SIZE_MAX;
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}
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static inline bool is_swiotlb_active(struct device *dev)
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{
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return false;
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}
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static inline void swiotlb_adjust_size(unsigned long size)
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{
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}
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#endif /* CONFIG_SWIOTLB */
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extern void swiotlb_print_info(void);
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#ifdef CONFIG_DMA_RESTRICTED_POOL
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struct page *swiotlb_alloc(struct device *dev, size_t size);
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bool swiotlb_free(struct device *dev, struct page *page, size_t size);
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static inline bool is_swiotlb_for_alloc(struct device *dev)
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{
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return dev->dma_io_tlb_mem->for_alloc;
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}
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#else
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static inline struct page *swiotlb_alloc(struct device *dev, size_t size)
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{
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return NULL;
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}
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static inline bool swiotlb_free(struct device *dev, struct page *page,
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size_t size)
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{
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return false;
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}
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static inline bool is_swiotlb_for_alloc(struct device *dev)
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{
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return false;
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}
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#endif /* CONFIG_DMA_RESTRICTED_POOL */
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#endif /* __LINUX_SWIOTLB_H */
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