linux-dev - Linux kernel development work

Age	Commit message (Collapse)	Author	Files	Lines
2019-03-18	drivers: Defer probe if firmware is not ready	Rajan Vaja	1	-3/+0
	Driver needs ZynqMP firmware interface to call EEMI APIs. In case firmware is not ready, dependent drivers should wait until the firmware is ready. Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com> Signed-off-by: Jolly Shah <jollys@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2019-03-18	firmware: xilinx: fix debugfs write handler	Jann Horn	1	-11/+4
	- Userspace wants to write a string with `len` bytes, not counting the terminating NULL, so we should allocate `len+1` bytes. It looks like the current code relied on having a nullbyte directly behind `kern_buff`, which happens to work reliably as long as `len` isn't one of the kmalloc size classes. - strncpy_from_user() is completely wrong here; userspace is giving us a (not necessarily null-terminated) buffer and its length. strncpy_from_user() is for cases in which we don't know the length. - Don't let broken userspace allocate arbitrarily big kmalloc allocations. Just use memdup_user_nul(), which is designed precisely for things like this. Signed-off-by: Jann Horn <jannh@google.com> Acked-by: Jolly Shah <jolly.shah@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2018-09-26	firmware: xilinx: Add debugfs for query data API	Rajan Vaja	1	-0/+28
	Add debugfs file to query platform specific data from firmware using debugfs interface. Signed-off-by: Rajan Vaja <rajanv@xilinx.com> Signed-off-by: Jolly Shah <jollys@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2018-09-26	firmware: xilinx: Add debugfs interface	Rajan Vaja	1	-0/+222
	Firmware-debug provides debugfs interface to all APIs. Debugfs can be used to call firmware APIs with required parameters. Usage: * Calling firmware API through debugfs: # echo "<api-name> <arg1> .. <argn>" > /sys/.../zynqmp-firmware/pm * Read output of last called firmware API: # cat /sys/.../zynqmp-firmware/pm Refer ug1200 for more information on these APIs: * https://www.xilinx.com/support/documentation/user_guides/ug1200-eemi-api.pdf Add basic debugfs file to get API version. Signed-off-by: Rajan Vaja <rajanv@xilinx.com> Signed-off-by: Jolly Shah <jollys@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com>