* Re: uio_pci_generic driver
[not found] ` <20120320180030.GB808@redhat.com>
@ 2012-03-20 18:48 ` tochansky
2012-03-20 20:17 ` Hans J. Koch
0 siblings, 1 reply; 3+ messages in thread
From: tochansky @ 2012-03-20 18:48 UTC (permalink / raw)
To: Michael S. Tsirkin; +Cc: linux-kernel
> 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? :-)
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: uio_pci_generic driver
2012-03-20 18:48 ` uio_pci_generic driver tochansky
@ 2012-03-20 20:17 ` Hans J. Koch
2012-03-20 20:34 ` Michael S. Tsirkin
0 siblings, 1 reply; 3+ messages in thread
From: Hans J. Koch @ 2012-03-20 20:17 UTC (permalink / raw)
To: tochansky; +Cc: Michael S. Tsirkin, linux-kernel
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
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: uio_pci_generic driver
2012-03-20 20:17 ` Hans J. Koch
@ 2012-03-20 20:34 ` Michael S. Tsirkin
0 siblings, 0 replies; 3+ messages in thread
From: Michael S. Tsirkin @ 2012-03-20 20:34 UTC (permalink / raw)
To: Hans J. Koch; +Cc: tochansky, linux-kernel
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.
^ permalink raw reply [flat|nested] 3+ messages in thread
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[not found] ` <20120320180030.GB808@redhat.com>
2012-03-20 18:48 ` uio_pci_generic driver tochansky
2012-03-20 20:17 ` Hans J. Koch
2012-03-20 20:34 ` Michael S. Tsirkin
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