195 строки
6.5 KiB
C
195 строки
6.5 KiB
C
/* 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-noncoherent.h>
|
|
#include <linux/memblock.h> /* for min_low_pfn */
|
|
#include <linux/mem_encrypt.h>
|
|
#include <linux/swiotlb.h>
|
|
|
|
extern unsigned int zone_dma_bits;
|
|
|
|
#ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
|
|
#include <asm/dma-direct.h>
|
|
#else
|
|
static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
|
|
{
|
|
dma_addr_t dev_addr = (dma_addr_t)paddr;
|
|
|
|
return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
|
|
}
|
|
|
|
static inline phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dev_addr)
|
|
{
|
|
phys_addr_t paddr = (phys_addr_t)dev_addr;
|
|
|
|
return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
|
|
}
|
|
#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 */
|
|
|
|
/*
|
|
* 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. The raw __phys_to_dma
|
|
* and __dma_to_phys versions should only be used on non-encrypted memory for
|
|
* special occasions like DMA coherent buffers.
|
|
*/
|
|
static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
|
|
{
|
|
return __sme_set(__phys_to_dma(dev, paddr));
|
|
}
|
|
|
|
static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
|
|
{
|
|
return __sme_clr(__dma_to_phys(dev, daddr));
|
|
}
|
|
|
|
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 (!dev->dma_mask)
|
|
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);
|
|
gfp_t dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask,
|
|
u64 *phys_mask);
|
|
bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size);
|
|
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);
|
|
void *dma_direct_alloc_pages(struct device *dev, size_t size,
|
|
dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs);
|
|
void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
|
|
dma_addr_t dma_addr, unsigned long attrs);
|
|
int dma_direct_get_sgtable(struct device *dev, struct sg_table *sgt,
|
|
void *cpu_addr, dma_addr_t dma_addr, size_t size,
|
|
unsigned long attrs);
|
|
bool dma_direct_can_mmap(struct device *dev);
|
|
int dma_direct_mmap(struct device *dev, struct vm_area_struct *vma,
|
|
void *cpu_addr, dma_addr_t dma_addr, size_t size,
|
|
unsigned long attrs);
|
|
int dma_direct_supported(struct device *dev, u64 mask);
|
|
bool dma_direct_need_sync(struct device *dev, dma_addr_t dma_addr);
|
|
int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
|
|
enum dma_data_direction dir, unsigned long attrs);
|
|
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);
|
|
size_t dma_direct_max_mapping_size(struct device *dev);
|
|
|
|
#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
|
|
defined(CONFIG_SWIOTLB)
|
|
void dma_direct_sync_sg_for_device(struct device *dev, struct scatterlist *sgl,
|
|
int nents, enum dma_data_direction dir);
|
|
#else
|
|
static inline void dma_direct_sync_sg_for_device(struct device *dev,
|
|
struct scatterlist *sgl, int nents, enum dma_data_direction dir)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
|
|
defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL) || \
|
|
defined(CONFIG_SWIOTLB)
|
|
void dma_direct_unmap_sg(struct device *dev, struct scatterlist *sgl,
|
|
int nents, enum dma_data_direction dir, unsigned long attrs);
|
|
void dma_direct_sync_sg_for_cpu(struct device *dev,
|
|
struct scatterlist *sgl, int nents, enum dma_data_direction dir);
|
|
#else
|
|
static inline void dma_direct_unmap_sg(struct device *dev,
|
|
struct scatterlist *sgl, int nents, enum dma_data_direction dir,
|
|
unsigned long attrs)
|
|
{
|
|
}
|
|
static inline void dma_direct_sync_sg_for_cpu(struct device *dev,
|
|
struct scatterlist *sgl, int nents, enum dma_data_direction dir)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static inline void dma_direct_sync_single_for_device(struct device *dev,
|
|
dma_addr_t addr, size_t size, enum dma_data_direction dir)
|
|
{
|
|
phys_addr_t paddr = dma_to_phys(dev, addr);
|
|
|
|
if (unlikely(is_swiotlb_buffer(paddr)))
|
|
swiotlb_tbl_sync_single(dev, paddr, size, dir, SYNC_FOR_DEVICE);
|
|
|
|
if (!dev_is_dma_coherent(dev))
|
|
arch_sync_dma_for_device(paddr, size, dir);
|
|
}
|
|
|
|
static inline void dma_direct_sync_single_for_cpu(struct device *dev,
|
|
dma_addr_t addr, size_t size, enum dma_data_direction dir)
|
|
{
|
|
phys_addr_t paddr = dma_to_phys(dev, addr);
|
|
|
|
if (!dev_is_dma_coherent(dev)) {
|
|
arch_sync_dma_for_cpu(paddr, size, dir);
|
|
arch_sync_dma_for_cpu_all();
|
|
}
|
|
|
|
if (unlikely(is_swiotlb_buffer(paddr)))
|
|
swiotlb_tbl_sync_single(dev, paddr, size, dir, SYNC_FOR_CPU);
|
|
}
|
|
|
|
static inline dma_addr_t dma_direct_map_page(struct device *dev,
|
|
struct page *page, unsigned long offset, size_t size,
|
|
enum dma_data_direction dir, unsigned long attrs)
|
|
{
|
|
phys_addr_t phys = page_to_phys(page) + offset;
|
|
dma_addr_t dma_addr = phys_to_dma(dev, phys);
|
|
|
|
if (unlikely(swiotlb_force == SWIOTLB_FORCE))
|
|
return swiotlb_map(dev, phys, size, dir, attrs);
|
|
|
|
if (unlikely(!dma_capable(dev, dma_addr, size, true))) {
|
|
if (swiotlb_force != SWIOTLB_NO_FORCE)
|
|
return swiotlb_map(dev, phys, size, dir, attrs);
|
|
|
|
dev_WARN_ONCE(dev, 1,
|
|
"DMA addr %pad+%zu overflow (mask %llx, bus limit %llx).\n",
|
|
&dma_addr, size, *dev->dma_mask, dev->bus_dma_limit);
|
|
return DMA_MAPPING_ERROR;
|
|
}
|
|
|
|
if (!dev_is_dma_coherent(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
|
|
arch_sync_dma_for_device(phys, size, dir);
|
|
return dma_addr;
|
|
}
|
|
|
|
static inline void dma_direct_unmap_page(struct device *dev, dma_addr_t addr,
|
|
size_t size, enum dma_data_direction dir, unsigned long attrs)
|
|
{
|
|
phys_addr_t phys = dma_to_phys(dev, addr);
|
|
|
|
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
|
|
dma_direct_sync_single_for_cpu(dev, addr, size, dir);
|
|
|
|
if (unlikely(is_swiotlb_buffer(phys)))
|
|
swiotlb_tbl_unmap_single(dev, phys, size, size, dir, attrs);
|
|
}
|
|
#endif /* _LINUX_DMA_DIRECT_H */
|