xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

fpga: dfl: afu: add AFU state related sysfs interfaces

Browse Source 
This patch introduces more sysfs interfaces for Accelerated
Function Unit (AFU). These interfaces allow users to read
current AFU Power State (APx), read / clear AFU Power (APx)
events which are sticky to identify transient APx state,
and manage AFU's LTR (latency tolerance reporting).

Signed-off-by: Ananda Ravuri <ananda.ravuri@intel.com>
Signed-off-by: Xu Yilun <yilun.xu@intel.com>
Signed-off-by: Wu Hao <hao.wu@intel.com>
Acked-by: Alan Tull <atull@kernel.org>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
Link: https://lore.kernel.org/r/1564914022-3710-4-git-send-email-hao.wu@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wu Hao
2019-08-04 18:20:13 +08:00
committed by Greg Kroah-Hartman
parent bdd4f30795
commit d2ad5ac1cd
3 changed files with 180 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

32
Documentation/ABI/testing/sysfs-platform-dfl-port
View File

@@ -14,3 +14,35 @@ Description: Read-only. User can program different PR bitstreams to FPGA
Accelerator Function Unit (AFU) for different functions. It
returns uuid which could be used to identify which PR bitstream
is programmed in this AFU.
What: /sys/bus/platform/devices/dfl-port.0/power_state
Date: August 2019
KernelVersion: 5.4
Contact: Wu Hao <hao.wu@intel.com>
Description: Read-only. It reports the APx (AFU Power) state, different APx
means different throttling level. When reading this file, it
returns "0" - Normal / "1" - AP1 / "2" - AP2 / "6" - AP6.
What: /sys/bus/platform/devices/dfl-port.0/ap1_event
Date: August 2019
KernelVersion: 5.4
Contact: Wu Hao <hao.wu@intel.com>
Description: Read-write. Read this file for AP1 (AFU Power State 1) event.
It's used to indicate transient AP1 state. Write 1 to this
file to clear AP1 event.
What: /sys/bus/platform/devices/dfl-port.0/ap2_event
Date: August 2019
KernelVersion: 5.4
Contact: Wu Hao <hao.wu@intel.com>
Description: Read-write. Read this file for AP2 (AFU Power State 2) event.
It's used to indicate transient AP2 state. Write 1 to this
file to clear AP2 event.
What: /sys/bus/platform/devices/dfl-port.0/ltr
Date: August 2019
KernelVersion: 5.4
Contact: Wu Hao <hao.wu@intel.com>
Description: Read-write. Read or set AFU latency tolerance reporting value.
Set ltr to 1 if the AFU can tolerate latency >= 40us or set it
to 0 if it is latency sensitive.