On Thu, 2015-06-11 at 15:09 +0530, Shubham Kumar wrote: > Dear Andy, > Try to avoid top posting. And keep this in the mailing list. Next time I will ignore private mails from you. > > We looked into what you said ,and compiled all the necessary drivers > statically, the screenshot of which I have attached. But still We are > not able to see any channel in /sys/class/dma.. May be you can be more > specific regarding the particular DMA driver you are referring to. You should know better your hardware. What do you want to achieve? What do you try to do? > We are running all this on an Intel Pentium dualcore CPU.. Unfortunately it tells me nothing. > On Wed, Jun 10, 2015 at 7:50 PM, Andy Shevchenko > <andriy.shevchenko@xxxxxxxxxxxxxxx> wrote: > [+Cc mailing list] > > Please, keep discussion public. > > On Wed, 2015-06-10 at 18:37 +0530, Shubham Kumar wrote: > > Dear Andy, > > > > We have been trying to test the dmatest driver provided in > the Kernel > > Source tree on an Ubuntu 14.04 x86 based 64-bit machine. For > the > > documentations and help , We have referred to your > dmatest.txt file > > present inside the Documentations directory in the Kernel > Source tree. > > We have built the dmatest file as a module on kernel version > 4.0.4 . > > Then We also followed your steps on loading the module > prescribed in > > your Documentation file dmatest.txt. On doing > > > > > > modprobe dmatest channel=dma0chan0 timeout=2000 iterations=1 > run=1 > > > > and seeing the logs in the dmesg, We are getting the > following error > > logs which says that the channel allocation has failed- > > > > dmaengine: __dma_request_channel: fail ((null)) > > > > > > We have attached the screenshot with this mail. > > > > On checking the available channel list from ls > -l /sys/class/dma/ > > , no channel is being shown. The same has been shown in the > > screenshot. We also checked the /proc/dma entry, No entry is > present > > there. > > > > Some help in this direction ,for fixing this issue, would be > appreciable. > > > The main problem you have no channels to test. It would be > caused by > absence of DMA driver, misbehaving driver, or bugs in the > driver's code. > > Until you have that folder (/sys/class/dma) empty you may not > try > dmatest, since it will do nothing. > > -- > Andy Shevchenko <andriy.shevchenko@xxxxxxxxx> > Intel Finland Oy > > > -- Andy Shevchenko <andriy.shevchenko@xxxxxxxxx> Intel Finland Oy -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
