Question regarding driver developement
Hi I am very sorry for disturbing the kernel development with this question which I suspect might be off topic. If I am totally off topic please tell me where to find help in your flame mails. I am developing a device driver (will be GPL) for a PCI board hosting two Digital Signal Processors (DSPs). The software running on the DSPs needs disk access (~10Mb/s). The board has DMA engines built in to it's PCI bridges which are capable of bus mastering. The Software running on the DSPs requires soft realtime response from the disk access. What I want to do is to stream data directly to a file on the hard drive if possible. The only way I have found so far is to write have two FIFO buffers in the driver (in and out) and use a daemon running in user space to manage the disk access. This is quite inefficient however since it requires at least 5 memcopy operations before the data reaches the hard drive. I could dedicate one complete SCSI bus for the disk I/O. Is it possible to write to a file from within a device driver? If it is it would save 3 memcopy operations (if I am correct :). Is it advisable? I am not subscribed to this list so please reply to me personally. Thank you very much for your help. Best Regards, //Anders __ Anders JohanssonRoom 314,113 Australian Telecommunications .-_|\ Visiting Research Associate Research Institute (ATRI)/ \ telephone: +61 8 9266 3268 Curtin Uni of Technology P_.-._/ e-mail: [EMAIL PROTECTED]Bentley WA, 6102. o __ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
Question regarding driver developement
Hi I am very sorry for disturbing the kernel development with this question which I suspect might be off topic. If I am totally off topic please tell me where to find help in your flame mails. I am developing a device driver (will be GPL) for a PCI board hosting two Digital Signal Processors (DSPs). The software running on the DSPs needs disk access (~10Mb/s). The board has DMA engines built in to it's PCI bridges which are capable of bus mastering. The Software running on the DSPs requires soft realtime response from the disk access. What I want to do is to stream data directly to a file on the hard drive if possible. The only way I have found so far is to write have two FIFO buffers in the driver (in and out) and use a daemon running in user space to manage the disk access. This is quite inefficient however since it requires at least 5 memcopy operations before the data reaches the hard drive. I could dedicate one complete SCSI bus for the disk I/O. Is it possible to write to a file from within a device driver? If it is it would save 3 memcopy operations (if I am correct :). Is it advisable? I am not subscribed to this list so please reply to me personally. Thank you very much for your help. Best Regards, //Anders __ Anders JohanssonRoom 314,113 Australian Telecommunications .-_|\ Visiting Research Associate Research Institute (ATRI)/ \ telephone: +61 8 9266 3268 Curtin Uni of Technology P_.-._/ e-mail: [EMAIL PROTECTED]Bentley WA, 6102. o __ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
