diff options
Diffstat (limited to 'dma.h')
| -rw-r--r-- | dma.h | 108 |
1 files changed, 87 insertions, 21 deletions
@@ -31,28 +31,74 @@ struct QEMUSGList { }; #if defined(TARGET_PHYS_ADDR_BITS) -typedef target_phys_addr_t dma_addr_t; -#define DMA_ADDR_BITS TARGET_PHYS_ADDR_BITS -#define DMA_ADDR_FMT TARGET_FMT_plx +/* + * When an IOMMU is present, bus addresses become distinct from + * CPU/memory physical addresses and may be a different size. Because + * the IOVA size depends more on the bus than on the platform, we more + * or less have to treat these as 64-bit always to cover all (or at + * least most) cases. + */ +typedef uint64_t dma_addr_t; + +#define DMA_ADDR_BITS 64 +#define DMA_ADDR_FMT "%" PRIx64 + +typedef int DMATranslateFunc(DMAContext *dma, + dma_addr_t addr, + target_phys_addr_t *paddr, + target_phys_addr_t *len, + DMADirection dir); +typedef void* DMAMapFunc(DMAContext *dma, + dma_addr_t addr, + dma_addr_t *len, + DMADirection dir); +typedef void DMAUnmapFunc(DMAContext *dma, + void *buffer, + dma_addr_t len, + DMADirection dir, + dma_addr_t access_len); + +struct DMAContext { + DMATranslateFunc *translate; + DMAMapFunc *map; + DMAUnmapFunc *unmap; +}; + +static inline bool dma_has_iommu(DMAContext *dma) +{ + return !!dma; +} /* Checks that the given range of addresses is valid for DMA. This is * useful for certain cases, but usually you should just use * dma_memory_{read,write}() and check for errors */ -static inline bool dma_memory_valid(DMAContext *dma, dma_addr_t addr, - dma_addr_t len, DMADirection dir) +bool iommu_dma_memory_valid(DMAContext *dma, dma_addr_t addr, dma_addr_t len, + DMADirection dir); +static inline bool dma_memory_valid(DMAContext *dma, + dma_addr_t addr, dma_addr_t len, + DMADirection dir) { - /* Stub version, with no iommu we assume all bus addresses are valid */ - return true; + if (!dma_has_iommu(dma)) { + return true; + } else { + return iommu_dma_memory_valid(dma, addr, len, dir); + } } +int iommu_dma_memory_rw(DMAContext *dma, dma_addr_t addr, + void *buf, dma_addr_t len, DMADirection dir); static inline int dma_memory_rw(DMAContext *dma, dma_addr_t addr, void *buf, dma_addr_t len, DMADirection dir) { - /* Stub version when we have no iommu support */ - cpu_physical_memory_rw(addr, buf, (target_phys_addr_t)len, - dir == DMA_DIRECTION_FROM_DEVICE); - return 0; + if (!dma_has_iommu(dma)) { + /* Fast-path for no IOMMU */ + cpu_physical_memory_rw(addr, buf, len, + dir == DMA_DIRECTION_FROM_DEVICE); + return 0; + } else { + return iommu_dma_memory_rw(dma, addr, buf, len, dir); + } } static inline int dma_memory_read(DMAContext *dma, dma_addr_t addr, @@ -68,28 +114,45 @@ static inline int dma_memory_write(DMAContext *dma, dma_addr_t addr, DMA_DIRECTION_FROM_DEVICE); } +int iommu_dma_memory_set(DMAContext *dma, dma_addr_t addr, uint8_t c, + dma_addr_t len); + int dma_memory_set(DMAContext *dma, dma_addr_t addr, uint8_t c, dma_addr_t len); +void *iommu_dma_memory_map(DMAContext *dma, + dma_addr_t addr, dma_addr_t *len, + DMADirection dir); static inline void *dma_memory_map(DMAContext *dma, dma_addr_t addr, dma_addr_t *len, DMADirection dir) { - target_phys_addr_t xlen = *len; - void *p; - - p = cpu_physical_memory_map(addr, &xlen, - dir == DMA_DIRECTION_FROM_DEVICE); - *len = xlen; - return p; + if (!dma_has_iommu(dma)) { + target_phys_addr_t xlen = *len; + void *p; + + p = cpu_physical_memory_map(addr, &xlen, + dir == DMA_DIRECTION_FROM_DEVICE); + *len = xlen; + return p; + } else { + return iommu_dma_memory_map(dma, addr, len, dir); + } } +void iommu_dma_memory_unmap(DMAContext *dma, + void *buffer, dma_addr_t len, + DMADirection dir, dma_addr_t access_len); static inline void dma_memory_unmap(DMAContext *dma, void *buffer, dma_addr_t len, DMADirection dir, dma_addr_t access_len) { - return cpu_physical_memory_unmap(buffer, (target_phys_addr_t)len, - dir == DMA_DIRECTION_FROM_DEVICE, - access_len); + if (!dma_has_iommu(dma)) { + return cpu_physical_memory_unmap(buffer, (target_phys_addr_t)len, + dir == DMA_DIRECTION_FROM_DEVICE, + access_len); + } else { + iommu_dma_memory_unmap(dma, buffer, len, dir, access_len); + } } #define DEFINE_LDST_DMA(_lname, _sname, _bits, _end) \ @@ -130,6 +193,9 @@ DEFINE_LDST_DMA(q, q, 64, be); #undef DEFINE_LDST_DMA +void dma_context_init(DMAContext *dma, DMATranslateFunc translate, + DMAMapFunc map, DMAUnmapFunc unmap); + struct ScatterGatherEntry { dma_addr_t base; dma_addr_t len; |