Messages in this thread | | | Date | Tue, 20 Mar 2012 22:34:11 +0200 | From | "Michael S. Tsirkin" <> | Subject | Re: uio_pci_generic driver |
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On Tue, Mar 20, 2012 at 09:17:00PM +0100, Hans J. Koch wrote: > On Tue, Mar 20, 2012 at 10:48:25PM +0400, tochansky@tochlab.net wrote: > > > On Tue, Mar 20, 2012 at 09:56:03PM +0400, tochansky@tochlab.net wrote: > > >> Hello! > > >> I have a question about uio_pci_generic driver. I'm trying to use it in > > >> my > > >> project, but have no luck. > > >> There are very little information on the subject. If you have a few > > >> minutes, I would like to ask a few questions. > > >> I need to mmap() memory of my board to work with it. I did > > >> # modprobe uio_pci_generic > > >> # echo "xxxx xxxx" > /sys/bus/pci/drivers/uio_pci_generic/new_id > > >> > > >> Files in /sys/class/uio/uio0 appears, but there no directory named > > >> /sys/class/uio/uio0/maps/. > > >> Anyway I tryed to mmap with code: > > >> > > >> #include <sys/types.h> > > >> #include <sys/stat.h> > > >> #include <fcntl.h> > > >> > > >> #include <sys/mman.h> > > >> #include <stdio.h> > > >> > > >> int main() > > >> { > > >> int fd = open("/dev/uio0", O_RDWR | O_SYNC); > > >> printf("fd = %d\n", fd); > > >> void *addr = mmap(NULL, 1024, PROT_READ, MAP_SHARED, fd, 0); > > >> printf("addr = %p\n", addr); > > >> } > > >> > > >> Ofcourse, mmap() failes with error "Invalid argument". Nothing criminal > > >> in > > >> dmesg and any other hints of error. > > >> > > >> -- > > >> Dmitriy > > > > > > > > > Map memory through /sys/bus/pci/devices/...... > > > > > > Also copy questions to mailing lists please. > > > > > Thanks, it works now. > > > > #include <sys/types.h> > > #include <sys/stat.h> > > #include <fcntl.h> > > > > #include <sys/mman.h> > > #include <stdio.h> > > > > int main() { > > int fd = > > open("/sys/class/pci_bus/0000:03/device/0000:03:00.0/resource5", > > O_RDWR | O_SYNC); > > printf("fd = %d\n", fd); > > void *addr = mmap(NULL, 512, PROT_READ, MAP_SHARED, fd, 0); > > if(addr == MAP_FAILED) { > > perror("mmap"); > > } > > else { > > printf("addr = %p\n", addr); > > } > > } > > > > May be its time to add some hints in documentation? :-) > > Good idea. Michael, are you in the mood to hack something up for > Documentation/DocBook/uio-howto.tmpl ? > > Thanks, > Hans
I'll see what can be done.
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