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       1                 :            : /* SPDX-License-Identifier: GPL-2.0 */
       2                 :            : #ifndef _LINUX_DMA_DIRECT_H
       3                 :            : #define _LINUX_DMA_DIRECT_H 1
       4                 :            : 
       5                 :            : #include <linux/dma-mapping.h>
       6                 :            : #include <linux/memblock.h> /* for min_low_pfn */
       7                 :            : #include <linux/mem_encrypt.h>
       8                 :            : 
       9                 :            : extern unsigned int zone_dma_bits;
      10                 :            : 
      11                 :            : #ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
      12                 :            : #include <asm/dma-direct.h>
      13                 :            : #else
      14                 :            : static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
      15                 :            : {
      16                 :            :         dma_addr_t dev_addr = (dma_addr_t)paddr;
      17                 :            : 
      18                 :            :         return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
      19                 :            : }
      20                 :            : 
      21                 :            : static inline phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dev_addr)
      22                 :            : {
      23                 :            :         phys_addr_t paddr = (phys_addr_t)dev_addr;
      24                 :            : 
      25                 :            :         return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
      26                 :            : }
      27                 :            : #endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
      28                 :            : 
      29                 :            : #ifdef CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED
      30                 :            : bool force_dma_unencrypted(struct device *dev);
      31                 :            : #else
      32                 :            : static inline bool force_dma_unencrypted(struct device *dev)
      33                 :            : {
      34                 :            :         return false;
      35                 :            : }
      36                 :            : #endif /* CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED */
      37                 :            : 
      38                 :            : /*
      39                 :            :  * If memory encryption is supported, phys_to_dma will set the memory encryption
      40                 :            :  * bit in the DMA address, and dma_to_phys will clear it.  The raw __phys_to_dma
      41                 :            :  * and __dma_to_phys versions should only be used on non-encrypted memory for
      42                 :            :  * special occasions like DMA coherent buffers.
      43                 :            :  */
      44                 :            : static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
      45                 :            : {
      46                 :            :         return __sme_set(__phys_to_dma(dev, paddr));
      47                 :            : }
      48                 :            : 
      49                 :            : static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
      50                 :            : {
      51                 :            :         return __sme_clr(__dma_to_phys(dev, daddr));
      52                 :            : }
      53                 :            : 
      54                 :          0 : static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size,
      55                 :            :                 bool is_ram)
      56                 :            : {
      57                 :          0 :         dma_addr_t end = addr + size - 1;
      58                 :            : 
      59                 :          0 :         if (!dev->dma_mask)
      60                 :            :                 return false;
      61                 :            : 
      62                 :          0 :         if (is_ram && !IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT) &&
      63                 :          0 :             min(addr, end) < phys_to_dma(dev, PFN_PHYS(min_low_pfn)))
      64                 :            :                 return false;
      65                 :            : 
      66                 :          0 :         return end <= min_not_zero(*dev->dma_mask, dev->bus_dma_limit);
      67                 :            : }
      68                 :            : 
      69                 :            : u64 dma_direct_get_required_mask(struct device *dev);
      70                 :            : void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
      71                 :            :                 gfp_t gfp, unsigned long attrs);
      72                 :            : void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
      73                 :            :                 dma_addr_t dma_addr, unsigned long attrs);
      74                 :            : void *dma_direct_alloc_pages(struct device *dev, size_t size,
      75                 :            :                 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs);
      76                 :            : void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
      77                 :            :                 dma_addr_t dma_addr, unsigned long attrs);
      78                 :            : struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
      79                 :            :                 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs);
      80                 :            : void __dma_direct_free_pages(struct device *dev, size_t size, struct page *page);
      81                 :            : int dma_direct_supported(struct device *dev, u64 mask);
      82                 :            : #endif /* _LINUX_DMA_DIRECT_H */