WDF Dma Transaction Issue
in [Device Drivers]
|
Prev: Mystery Msft_Kernel file left in drivers directory
Next: Why the disk driver (disk.sys) can not receive a PDO(physical device object) that is created by a class(disk) low filter driver?
From: Murugesan on 2 Nov 2009 16:03 Hi all, I need to perform DMA for 8 bytes for which i've failed. I've followed the following sequence. pMem = MmAllocateContiguousMemory(8, HighAddress) if((pMem == NULL) || FdoData == NULL) { TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, "pcial_dma_transfer() FAILED pMem || FdoData = NULL\n"); return !STATUS_SUCCESS; } pMdl = IoAllocateMdl(pMem , 8, FALSE, TRUE, NULL); if (pMdl == NULL) { TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, "IoAllocateMdl FAILED\n"); return !STATUS_SUCCESS; } DmaDirection = (rw == DMARW_CNL_TO_HOST) ? WdfDmaDirectionReadFromDevice: WdfDmaDirectionWriteToDevice; status = WdfDmaTransactionCreate( FdoData->WdfDmaEnabler, WDF_NO_OBJECT_ATTRIBUTES, &dmaTransaction ); if(status == STATUS_SUCCESS) TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, "WdfDmaTransactionCreate SUCCESS\n"); else TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, "WdfDmaTransactionCreate ERROR\n"); status = WdfDmaTransactionInitialize( dmaTransaction, ProgramDmaFunction, DmaDirection, pMdl, pMem, length); if(status == STATUS_SUCCESS) TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, "WdfDmaTransactionInitialize SUCCESS\n"); else { TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, "WdfDmaTransactionInitialize ERROR status=0x%x\n",status); return status; } status = WdfDmaTransactionExecute( dmaTransaction, NULL); if(status == STATUS_SUCCESS) { TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, "WdfDmaTransactionExecute SUCCESS\n"); } else TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, "WdfDmaTransactionExecute ERROR\n"); Where in the ProgramDmaFunction(), i've initiated h/w DMA operations by fetching the physical address from the input scatter gather list element, poll for DMA completion interrupt bit & complete the DMA with wdfdmacompletedfinal & released the dmatransaction. After this sequence, when i checked the value of pMem, it remains unchanged as zero which is not my expected value. I have the following questions related with it. 1. Can we perform DMA for 8 bytes using dmatransaction ?( I have no other option of PIO since my h/w design is in such a way, that supports only DMA) 2. What is wrong in the above mentioned sequence ? 3. Is it mandatory to call WdfDmaTransactionDmaCompleted in DPC handler ? [ Right now, i've some problem with the interrupt, so only polling mode is used) 4. I won't initiate DMA on the context of a wdfrequest, so i can't use WdfDmaTransactionInitializeUsingRequest(), will it be an issue ? [ This is because all the sample drivers provided by microsoft has used WdfDmaTransactionInitializeUsingRequest() and DMA has been initiated from EvtIoQueue dispatched by any WdfRequest. Thanks in advance, Murugesan.S
From: eagersh on 5 Nov 2009 21:57 On Nov 2, 2:03 pm, Murugesan <Muruge...(a)discussions.microsoft.com> wrote: > Hi all, > > I need to perform DMA for 8 bytes for which i've failed. > I've followed the following sequence. > > pMem = MmAllocateContiguousMemory(8, HighAddress) > if((pMem == NULL) || FdoData == NULL) > { > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > "pcial_dma_transfer() FAILED pMem || FdoData = NULL\n"); > return !STATUS_SUCCESS; > } > > pMdl = IoAllocateMdl(pMem , 8, FALSE, TRUE, NULL); > > if (pMdl == NULL) > { > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > "IoAllocateMdl FAILED\n"); > return !STATUS_SUCCESS; > } > > DmaDirection = (rw == DMARW_CNL_TO_HOST) ? > WdfDmaDirectionReadFromDevice: > WdfDmaDirectionWriteToDevice; > > status = WdfDmaTransactionCreate( FdoData->WdfDmaEnabler, > WDF_NO_OBJECT_ATTRIBUTES, > &dmaTransaction ); > if(status == STATUS_SUCCESS) > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > "WdfDmaTransactionCreate SUCCESS\n"); > else > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > "WdfDmaTransactionCreate ERROR\n"); > > status = WdfDmaTransactionInitialize( > dmaTransaction, > ProgramDmaFunction, > DmaDirection, > pMdl, > pMem, > length); > > if(status == STATUS_SUCCESS) > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > "WdfDmaTransactionInitialize SUCCESS\n"); > else > { > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > "WdfDmaTransactionInitialize ERROR status=0x%x\n",status); > return status; > } > > status = WdfDmaTransactionExecute( dmaTransaction, NULL); > > if(status == STATUS_SUCCESS) > { > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > "WdfDmaTransactionExecute SUCCESS\n"); > } > else > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > "WdfDmaTransactionExecute ERROR\n"); > > Where in the ProgramDmaFunction(), i've initiated h/w DMA operations by > fetching the physical address from the input > scatter gather list element, poll for DMA completion interrupt bit & > complete the DMA with wdfdmacompletedfinal & released > the dmatransaction. > > After this sequence, when i checked the value of pMem, it remains unchanged > as zero which is not my expected value. > > I have the following questions related with it. > > 1. Can we perform DMA for 8 bytes using dmatransaction ?( I have no other > option of PIO since my h/w design is in such a way, that supports only DMA) > 2. What is wrong in the above mentioned sequence ? > 3. Is it mandatory to call WdfDmaTransactionDmaCompleted in DPC handler ? [ > Right now, i've some problem with the interrupt, so only polling mode is used) > 4. I won't initiate DMA on the context of a wdfrequest, so i can't use > WdfDmaTransactionInitializeUsingRequest(), will it be an issue ? [ This is > because all the sample drivers provided by microsoft has used > WdfDmaTransactionInitializeUsingRequest() and DMA has been initiated from > EvtIoQueue dispatched by any WdfRequest. > > Thanks in advance, > Murugesan.S You should check in your Hardware Engineer group if DMA engine could support such small transaction. It is very inefficient to use DMA for this amount of data. You should use simple Read/Write PCI operations for such transfer. Igor Sharovar
From: Murugesan on 11 Nov 2009 01:37 Hi Igor, I am pretty sure that my h/w DMA engine supports such small transaction. I have a reference driver in linux which does the same operation. As I mentioned earlier, the h/w has not mapped these buffers into PCI registers. So I cannot do PCI read/write, performing DMA is the only way as per my h/w design. I am wondering whether KMDF DMA methodology supports such small transaction. Also why they haven't provided any sample which performs DMA using the memory allocated in the same layer ? Is any thing incorrect in my sequence of DMA operation other than the number of bytes ? Murugesan "eagersh" wrote: > On Nov 2, 2:03 pm, Murugesan <Muruge...(a)discussions.microsoft.com> > wrote: > > Hi all, > > > > I need to perform DMA for 8 bytes for which i've failed. > > I've followed the following sequence. > > > > pMem = MmAllocateContiguousMemory(8, HighAddress) > > if((pMem == NULL) || FdoData == NULL) > > { > > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > > "pcial_dma_transfer() FAILED pMem || FdoData = NULL\n"); > > return !STATUS_SUCCESS; > > } > > > > pMdl = IoAllocateMdl(pMem , 8, FALSE, TRUE, NULL); > > > > if (pMdl == NULL) > > { > > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > > "IoAllocateMdl FAILED\n"); > > return !STATUS_SUCCESS; > > } > > > > DmaDirection = (rw == DMARW_CNL_TO_HOST) ? > > WdfDmaDirectionReadFromDevice: > > WdfDmaDirectionWriteToDevice; > > > > status = WdfDmaTransactionCreate( FdoData->WdfDmaEnabler, > > WDF_NO_OBJECT_ATTRIBUTES, > > &dmaTransaction ); > > if(status == STATUS_SUCCESS) > > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > > "WdfDmaTransactionCreate SUCCESS\n"); > > else > > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > > "WdfDmaTransactionCreate ERROR\n"); > > > > status = WdfDmaTransactionInitialize( > > dmaTransaction, > > ProgramDmaFunction, > > DmaDirection, > > pMdl, > > pMem, > > length); > > > > if(status == STATUS_SUCCESS) > > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > > "WdfDmaTransactionInitialize SUCCESS\n"); > > else > > { > > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > > "WdfDmaTransactionInitialize ERROR status=0x%x\n",status); > > return status; > > } > > > > status = WdfDmaTransactionExecute( dmaTransaction, NULL); > > > > if(status == STATUS_SUCCESS) > > { > > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > > "WdfDmaTransactionExecute SUCCESS\n"); > > } > > else > > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > > "WdfDmaTransactionExecute ERROR\n"); > > > > Where in the ProgramDmaFunction(), i've initiated h/w DMA operations by > > fetching the physical address from the input > > scatter gather list element, poll for DMA completion interrupt bit & > > complete the DMA with wdfdmacompletedfinal & released > > the dmatransaction. > > > > After this sequence, when i checked the value of pMem, it remains unchanged > > as zero which is not my expected value. > > > > I have the following questions related with it. > > > > 1. Can we perform DMA for 8 bytes using dmatransaction ?( I have no other > > option of PIO since my h/w design is in such a way, that supports only DMA) > > 2. What is wrong in the above mentioned sequence ? > > 3. Is it mandatory to call WdfDmaTransactionDmaCompleted in DPC handler ? [ > > Right now, i've some problem with the interrupt, so only polling mode is used) > > 4. I won't initiate DMA on the context of a wdfrequest, so i can't use > > WdfDmaTransactionInitializeUsingRequest(), will it be an issue ? [ This is > > because all the sample drivers provided by microsoft has used > > WdfDmaTransactionInitializeUsingRequest() and DMA has been initiated from > > EvtIoQueue dispatched by any WdfRequest. > > > > Thanks in advance, > > Murugesan.S > > You should check in your Hardware Engineer group if DMA engine could > support such small transaction. > It is very inefficient to use DMA for this amount of data. You should > use simple Read/Write PCI operations for such transfer. > > Igor Sharovar > > . >
From: eagersh on 11 Nov 2009 14:41 On Nov 10, 11:37 pm, Murugesan <Muruge...(a)discussions.microsoft.com> wrote: > Hi Igor, > > I am pretty sure that my h/w DMA engine supports such small transaction. I > have a reference driver in linux which does the same operation. As I > mentioned earlier, the h/w has not mapped these buffers into PCI registers. > So I cannot do PCI read/write, performing DMA is the only way as per my h/w > design. I am wondering whether KMDF DMA methodology supports such small > transaction. Also why they haven't provided any sample which performs DMA > using the memory allocated in the same layer ? > Is any thing incorrect in my sequence of DMA operation other than the number > of bytes ? > > Murugesan > > "eagersh" wrote: > > On Nov 2, 2:03 pm, Murugesan <Muruge...(a)discussions.microsoft.com> > > wrote: > > > Hi all, > > > > I need to perform DMA for 8 bytes for which i've failed. > > > I've followed the following sequence. > > > > pMem = MmAllocateContiguousMemory(8, HighAddress) > > > if((pMem == NULL) || FdoData == NULL) > > > { > > > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > > > "pcial_dma_transfer() FAILED pMem || FdoData = NULL\n"); > > > return !STATUS_SUCCESS; > > > } > > > > pMdl = IoAllocateMdl(pMem , 8, FALSE, TRUE, NULL); > > > > if (pMdl == NULL) > > > { > > > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > > > "IoAllocateMdl FAILED\n"); > > > return !STATUS_SUCCESS; > > > } > > > > DmaDirection = (rw == DMARW_CNL_TO_HOST) ? > > > WdfDmaDirectionReadFromDevice: > > > WdfDmaDirectionWriteToDevice; > > > > status = WdfDmaTransactionCreate( FdoData->WdfDmaEnabler, > > > WDF_NO_OBJECT_ATTRIBUTES, > > > &dmaTransaction ); > > > if(status == STATUS_SUCCESS) > > > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > > > "WdfDmaTransactionCreate SUCCESS\n"); > > > else > > > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > > > "WdfDmaTransactionCreate ERROR\n"); > > > > status = WdfDmaTransactionInitialize( > > > dmaTransaction, > > > ProgramDmaFunction, > > > DmaDirection, > > > pMdl, > > > pMem, > > > length); > > > > if(status == STATUS_SUCCESS) > > > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > > > "WdfDmaTransactionInitialize SUCCESS\n"); > > > else > > > { > > > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > > > "WdfDmaTransactionInitialize ERROR status=0x%x\n",status); > > > return status; > > > } > > > > status = WdfDmaTransactionExecute( dmaTransaction, NULL); > > > > if(status == STATUS_SUCCESS) > > > { > > > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > > > "WdfDmaTransactionExecute SUCCESS\n"); > > > } > > > else > > > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > > > "WdfDmaTransactionExecute ERROR\n"); > > > > Where in the ProgramDmaFunction(), i've initiated h/w DMA operations by > > > fetching the physical address from the input > > > scatter gather list element, poll for DMA completion interrupt bit & > > > complete the DMA with wdfdmacompletedfinal & released > > > the dmatransaction. > > > > After this sequence, when i checked the value of pMem, it remains unchanged > > > as zero which is not my expected value. > > > > I have the following questions related with it. > > > > 1. Can we perform DMA for 8 bytes using dmatransaction ?( I have no other > > > option of PIO since my h/w design is in such a way, that supports only DMA) > > > 2. What is wrong in the above mentioned sequence ? > > > 3. Is it mandatory to call WdfDmaTransactionDmaCompleted in DPC handler ? [ > > > Right now, i've some problem with the interrupt, so only polling mode is used) > > > 4. I won't initiate DMA on the context of a wdfrequest, so i can't use > > > WdfDmaTransactionInitializeUsingRequest(), will it be an issue ? [ This is > > > because all the sample drivers provided by microsoft has used > > > WdfDmaTransactionInitializeUsingRequest() and DMA has been initiated from > > > EvtIoQueue dispatched by any WdfRequest. > > > > Thanks in advance, > > > Murugesan.S > > > You should check in your Hardware Engineer group if DMA engine could > > support such small transaction. > > It is very inefficient to use DMA for this amount of data. You should > > use simple Read/Write PCI operations for such transfer. > > > Igor Sharovar > > > . If you hardware does not support Read/Write PCI transactions how could you control DMA operation? You need at least access to DMA registers of the device. And you could do it only through PCI Read/Write. Do I miss something? Igor Sharovar
From: Murugesan on 13 Nov 2009 15:04
Sorry Igor, my information might be unclear.I doesn't mean like that. We have a separate core which follows a vendor specific protocol. Some registers are there to control this core which is in a separate memory in the h/w & can be read/write only by using DMA. We have some registers mapped from PCI space separately which includes DMA ADDR registers, DMA Control registers. The registers to control the core are not mapped to PCI space, so slave access to these registers are not possible. Core regiser read/write can only done through DMA. Now my question is does framework supports to perform DMA for such small length? Murugesan agersh" wrote: > On Nov 10, 11:37 pm, Murugesan <Muruge...(a)discussions.microsoft.com> > wrote: > > Hi Igor, > > > > I am pretty sure that my h/w DMA engine supports such small transaction. I > > have a reference driver in linux which does the same operation. As I > > mentioned earlier, the h/w has not mapped these buffers into PCI registers. > > So I cannot do PCI read/write, performing DMA is the only way as per my h/w > > design. I am wondering whether KMDF DMA methodology supports such small > > transaction. Also why they haven't provided any sample which performs DMA > > using the memory allocated in the same layer ? > > Is any thing incorrect in my sequence of DMA operation other than the number > > of bytes ? > > > > Murugesan > > > > "eagersh" wrote: > > > On Nov 2, 2:03 pm, Murugesan <Muruge...(a)discussions.microsoft.com> > > > wrote: > > > > Hi all, > > > > > > I need to perform DMA for 8 bytes for which i've failed. > > > > I've followed the following sequence. > > > > > > pMem = MmAllocateContiguousMemory(8, HighAddress) > > > > if((pMem == NULL) || FdoData == NULL) > > > > { > > > > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > > > > "pcial_dma_transfer() FAILED pMem || FdoData = NULL\n"); > > > > return !STATUS_SUCCESS; > > > > } > > > > > > pMdl = IoAllocateMdl(pMem , 8, FALSE, TRUE, NULL); > > > > > > if (pMdl == NULL) > > > > { > > > > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > > > > "IoAllocateMdl FAILED\n"); > > > > return !STATUS_SUCCESS; > > > > } > > > > > > DmaDirection = (rw == DMARW_CNL_TO_HOST) ? > > > > WdfDmaDirectionReadFromDevice: > > > > WdfDmaDirectionWriteToDevice; > > > > > > status = WdfDmaTransactionCreate( FdoData->WdfDmaEnabler, > > > > WDF_NO_OBJECT_ATTRIBUTES, > > > > &dmaTransaction ); > > > > if(status == STATUS_SUCCESS) > > > > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > > > > "WdfDmaTransactionCreate SUCCESS\n"); > > > > else > > > > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > > > > "WdfDmaTransactionCreate ERROR\n"); > > > > > > status = WdfDmaTransactionInitialize( > > > > dmaTransaction, > > > > ProgramDmaFunction, > > > > DmaDirection, > > > > pMdl, > > > > pMem, > > > > length); > > > > > > if(status == STATUS_SUCCESS) > > > > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > > > > "WdfDmaTransactionInitialize SUCCESS\n"); > > > > else > > > > { > > > > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > > > > "WdfDmaTransactionInitialize ERROR status=0x%x\n",status); > > > > return status; > > > > } > > > > > > status = WdfDmaTransactionExecute( dmaTransaction, NULL); > > > > > > if(status == STATUS_SUCCESS) > > > > { > > > > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > > > > "WdfDmaTransactionExecute SUCCESS\n"); > > > > } > > > > else > > > > TraceEvents(TRACE_LEVEL_INFORMATION, DBG_PNP, > > > > "WdfDmaTransactionExecute ERROR\n"); > > > > > > Where in the ProgramDmaFunction(), i've initiated h/w DMA operations by > > > > fetching the physical address from the input > > > > scatter gather list element, poll for DMA completion interrupt bit & > > > > complete the DMA with wdfdmacompletedfinal & released > > > > the dmatransaction. > > > > > > After this sequence, when i checked the value of pMem, it remains unchanged > > > > as zero which is not my expected value. > > > > > > I have the following questions related with it. > > > > > > 1. Can we perform DMA for 8 bytes using dmatransaction ?( I have no other > > > > option of PIO since my h/w design is in such a way, that supports only DMA) > > > > 2. What is wrong in the above mentioned sequence ? > > > > 3. Is it mandatory to call WdfDmaTransactionDmaCompleted in DPC handler ? [ > > > > Right now, i've some problem with the interrupt, so only polling mode is used) > > > > 4. I won't initiate DMA on the context of a wdfrequest, so i can't use > > > > WdfDmaTransactionInitializeUsingRequest(), will it be an issue ? [ This is > > > > because all the sample drivers provided by microsoft has used > > > > WdfDmaTransactionInitializeUsingRequest() and DMA has been initiated from > > > > EvtIoQueue dispatched by any WdfRequest. > > > > > > Thanks in advance, > > > > Murugesan.S > > > > > You should check in your Hardware Engineer group if DMA engine could > > > support such small transaction. > > > It is very inefficient to use DMA for this amount of data. You should > > > use simple Read/Write PCI operations for such transfer. > > > > > Igor Sharovar > > > > > . > > If you hardware does not support Read/Write PCI transactions how could > you control DMA operation? You need at least access to DMA registers > of the device. And you could do it only through PCI Read/Write. > Do I miss something? > > Igor Sharovar > . > |