DMA API to get physical address when SMMU is enabled
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Our vendor's custom driver uses dma_alloc_coherent() to get both virtual address and bus address followed by virt_to_phys() to fetch the physical address.
This works fine when the driver and application are executed on PC but fails when SMMU is enabled on our board.
Memory allocation, mapping and data transfer in the application are performed as follows.
status = AllocMemory( hDrv, local.memSize, &local.memPhysAdrs, &local.memBusAdrs );
printf("1. Physical Memory[DATA] : %llx [%llx] (0x%x)n",local.memPhysAdrs,local.memBusAdrs,local.memSize);
// Map a physical memory block to virtual space
status = MapMemory( hDrv, local.memPhysAdrs, local.memSize, (PVOID*)&local.hSharedMemory, MM_NONCACHED );
printf("Virtual Address[DATA] : %llxn",local.hSharedMemory);
status = MemDmaWriteRaw(hDrv,DMA_WAIT_COMPLETION,partner.devId,Channel,
local.memBusSrc,partner.memBusAdrs,local.memSize,0);
Can anybody help me with a DMA API to get the physical address?
Currently, the bus address is assigned to the physical address, but DMA operations failed.
Thanks in advance !!!
c dma
edited Nov 19 at 10:09
AS Mackay
1,7613816
asked Nov 19 at 9:18
PBang
11
add a comment |
up vote
0
down vote
favorite
Our vendor's custom driver uses dma_alloc_coherent() to get both virtual address and bus address followed by virt_to_phys() to fetch the physical address.
This works fine when the driver and application are executed on PC but fails when SMMU is enabled on our board.
Memory allocation, mapping and data transfer in the application are performed as follows.
status = AllocMemory( hDrv, local.memSize, &local.memPhysAdrs, &local.memBusAdrs );
printf("1. Physical Memory[DATA] : %llx [%llx] (0x%x)n",local.memPhysAdrs,local.memBusAdrs,local.memSize);
// Map a physical memory block to virtual space
status = MapMemory( hDrv, local.memPhysAdrs, local.memSize, (PVOID*)&local.hSharedMemory, MM_NONCACHED );
printf("Virtual Address[DATA] : %llxn",local.hSharedMemory);
status = MemDmaWriteRaw(hDrv,DMA_WAIT_COMPLETION,partner.devId,Channel,
local.memBusSrc,partner.memBusAdrs,local.memSize,0);
Can anybody help me with a DMA API to get the physical address?
Currently, the bus address is assigned to the physical address, but DMA operations failed.
Thanks in advance !!!
c dma
edited Nov 19 at 10:09
AS Mackay
1,7613816
asked Nov 19 at 9:18
PBang
11
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
Our vendor's custom driver uses dma_alloc_coherent() to get both virtual address and bus address followed by virt_to_phys() to fetch the physical address.
This works fine when the driver and application are executed on PC but fails when SMMU is enabled on our board.
Memory allocation, mapping and data transfer in the application are performed as follows.
status = AllocMemory( hDrv, local.memSize, &local.memPhysAdrs, &local.memBusAdrs );
printf("1. Physical Memory[DATA] : %llx [%llx] (0x%x)n",local.memPhysAdrs,local.memBusAdrs,local.memSize);
// Map a physical memory block to virtual space
status = MapMemory( hDrv, local.memPhysAdrs, local.memSize, (PVOID*)&local.hSharedMemory, MM_NONCACHED );
printf("Virtual Address[DATA] : %llxn",local.hSharedMemory);
status = MemDmaWriteRaw(hDrv,DMA_WAIT_COMPLETION,partner.devId,Channel,
local.memBusSrc,partner.memBusAdrs,local.memSize,0);
Can anybody help me with a DMA API to get the physical address?
Currently, the bus address is assigned to the physical address, but DMA operations failed.
Thanks in advance !!!
c dma
edited Nov 19 at 10:09
AS Mackay
1,7613816
asked Nov 19 at 9:18
PBang
11
Our vendor's custom driver uses dma_alloc_coherent() to get both virtual address and bus address followed by virt_to_phys() to fetch the physical address.
This works fine when the driver and application are executed on PC but fails when SMMU is enabled on our board.
Memory allocation, mapping and data transfer in the application are performed as follows.
status = AllocMemory( hDrv, local.memSize, &local.memPhysAdrs, &local.memBusAdrs );
printf("1. Physical Memory[DATA] : %llx [%llx] (0x%x)n",local.memPhysAdrs,local.memBusAdrs,local.memSize);
// Map a physical memory block to virtual space
status = MapMemory( hDrv, local.memPhysAdrs, local.memSize, (PVOID*)&local.hSharedMemory, MM_NONCACHED );
printf("Virtual Address[DATA] : %llxn",local.hSharedMemory);
status = MemDmaWriteRaw(hDrv,DMA_WAIT_COMPLETION,partner.devId,Channel,
local.memBusSrc,partner.memBusAdrs,local.memSize,0);
Can anybody help me with a DMA API to get the physical address?
Currently, the bus address is assigned to the physical address, but DMA operations failed.
Thanks in advance !!!
c dma
c dma
edited Nov 19 at 10:09
AS Mackay
1,7613816
asked Nov 19 at 9:18
PBang
11
edited Nov 19 at 10:09
AS Mackay
1,7613816
asked Nov 19 at 9:18
PBang
11
edited Nov 19 at 10:09
AS Mackay
1,7613816
edited Nov 19 at 10:09
AS Mackay
1,7613816
edited Nov 19 at 10:09
AS Mackay
1,7613816
1,7613816
asked Nov 19 at 9:18
PBang
11
asked Nov 19 at 9:18
PBang
11
asked Nov 19 at 9:18
PBang
11
11
add a comment |
add a comment |
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