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- /* SPDX-License-Identifier: GPL-2.0 */
- /*
- * Internals of the DMA direct mapping implementation. Only for use by the
- * DMA mapping code and IOMMU drivers.
- */
- #ifndef _LINUX_DMA_DIRECT_H
- #define _LINUX_DMA_DIRECT_H 1
- #include <linux/dma-mapping.h>
- #include <linux/dma-map-ops.h>
- #include <linux/memblock.h> /* for min_low_pfn */
- #include <linux/mem_encrypt.h>
- #include <linux/swiotlb.h>
- extern unsigned int zone_dma_bits;
- /*
- * Record the mapping of CPU physical to DMA addresses for a given region.
- */
- struct bus_dma_region {
- phys_addr_t cpu_start;
- dma_addr_t dma_start;
- u64 size;
- u64 offset;
- };
- static inline bool zone_dma32_is_empty(int node)
- {
- #ifdef CONFIG_ZONE_DMA32
- pg_data_t *pgdat = NODE_DATA(node);
- return zone_is_empty(&pgdat->node_zones[ZONE_DMA32]);
- #else
- return true;
- #endif
- }
- static inline bool zone_dma32_are_empty(void)
- {
- #ifdef CONFIG_NUMA
- int node;
- for_each_node(node)
- if (!zone_dma32_is_empty(node))
- return false;
- #else
- if (!zone_dma32_is_empty(numa_node_id()))
- return false;
- #endif
- return true;
- }
- static inline dma_addr_t translate_phys_to_dma(struct device *dev,
- phys_addr_t paddr)
- {
- const struct bus_dma_region *m;
- for (m = dev->dma_range_map; m->size; m++)
- if (paddr >= m->cpu_start && paddr - m->cpu_start < m->size)
- return (dma_addr_t)paddr - m->offset;
- /* make sure dma_capable fails when no translation is available */
- return DMA_MAPPING_ERROR;
- }
- static inline phys_addr_t translate_dma_to_phys(struct device *dev,
- dma_addr_t dma_addr)
- {
- const struct bus_dma_region *m;
- for (m = dev->dma_range_map; m->size; m++)
- if (dma_addr >= m->dma_start && dma_addr - m->dma_start < m->size)
- return (phys_addr_t)dma_addr + m->offset;
- return (phys_addr_t)-1;
- }
- #ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
- #include <asm/dma-direct.h>
- #ifndef phys_to_dma_unencrypted
- #define phys_to_dma_unencrypted phys_to_dma
- #endif
- #else
- static inline dma_addr_t phys_to_dma_unencrypted(struct device *dev,
- phys_addr_t paddr)
- {
- if (dev->dma_range_map)
- return translate_phys_to_dma(dev, paddr);
- return paddr;
- }
- /*
- * If memory encryption is supported, phys_to_dma will set the memory encryption
- * bit in the DMA address, and dma_to_phys will clear it.
- * phys_to_dma_unencrypted is for use on special unencrypted memory like swiotlb
- * buffers.
- */
- static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
- {
- return __sme_set(phys_to_dma_unencrypted(dev, paddr));
- }
- static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dma_addr)
- {
- phys_addr_t paddr;
- if (dev->dma_range_map)
- paddr = translate_dma_to_phys(dev, dma_addr);
- else
- paddr = dma_addr;
- return __sme_clr(paddr);
- }
- #endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
- #ifdef CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED
- bool force_dma_unencrypted(struct device *dev);
- #else
- static inline bool force_dma_unencrypted(struct device *dev)
- {
- return false;
- }
- #endif /* CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED */
- static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size,
- bool is_ram)
- {
- dma_addr_t end = addr + size - 1;
- if (addr == DMA_MAPPING_ERROR)
- return false;
- if (is_ram && !IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT) &&
- min(addr, end) < phys_to_dma(dev, PFN_PHYS(min_low_pfn)))
- return false;
- return end <= min_not_zero(*dev->dma_mask, dev->bus_dma_limit);
- }
- u64 dma_direct_get_required_mask(struct device *dev);
- void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
- gfp_t gfp, unsigned long attrs);
- void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
- dma_addr_t dma_addr, unsigned long attrs);
- struct page *dma_direct_alloc_pages(struct device *dev, size_t size,
- dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp);
- void dma_direct_free_pages(struct device *dev, size_t size,
- struct page *page, dma_addr_t dma_addr,
- enum dma_data_direction dir);
- int dma_direct_supported(struct device *dev, u64 mask);
- dma_addr_t dma_direct_map_resource(struct device *dev, phys_addr_t paddr,
- size_t size, enum dma_data_direction dir, unsigned long attrs);
- #endif /* _LINUX_DMA_DIRECT_H */
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