Mark, On 1/15/2016 11:01 AM, Sinan Kaya wrote: >> I'm concerned with how this is safe, and with the userspace interface. >> > e.g. if the user wants to up the QoS for a VM, how to they find the >> > right channel in sysfs to alter? > The HW supports changing the QoS values on the flight. In order to locate the > object, I'm exporting a > > I tried to address your concern on v10 last series. Here is brief summary. > > Each channel device has a sysfs entry named chid. > What: /sys/devices/platform/hidma-*/chid > + /sys/devices/platform/QCOM8061:*/chid > > > Each management object has one priority and weight file per channel. > +What: /sys/devices/platform/hidma-mgmt*/chanops/chan*/priority > + /sys/devices/platform/QCOM8060:*/chanops/chan*/priority > > Suppose you want to change the priority of a channel you assigned to guess, > the userspace application goes and reads the chid value of the channel. > > Then goes to chanops/chan<chid>/ directory and can change priority and weight > parameters here. > > Here is how the directory looks like. QCOM8060:00 is a management object. > QCOM8061:0x are the channel objects. > > /sys/devices/platform/QCOM8060:00# ls > QCOM8061:00 > QCOM8061:01 > QCOM8061:02 > QCOM8061:03 > QCOM8061:04 > QCOM8061:05 > chanops > <other common attributes> > > > > Did this answer your question? I'm capturing all the questions and answers as FAQ into the cover letter as I keep repeating myself for every single reviewer. Besides from the "lack of documentation", is there any code related change you'd like to discuss in the series. -- Sinan Kaya Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project -- 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
