cxl: Add ability to reset the card
Adds reset to sysfs which will PERST the card. If load_image_on_perst is set
to "user" or "factory", the PERST will cause that image to be loaded.
load_image_on_perst is set to "user" for production.
"none" could be used for debugging. The PSL trace arrays are preserved which
then can be read through debugfs.
PERST also triggers CAPP recovery. An HMI comes in, which is handled by EEH.
EEH unbinds the driver, calls into Sapphire to reinitialize the PHB, then
rebinds the driver.
Signed-off-by: Ryan Grimm <grimm@linux.vnet.ibm.com>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
diff --git a/Documentation/ABI/testing/sysfs-class-cxl b/Documentation/ABI/testing/sysfs-class-cxl
index 5941ff3..9ea0106 100644
--- a/Documentation/ABI/testing/sysfs-class-cxl
+++ b/Documentation/ABI/testing/sysfs-class-cxl
@@ -146,3 +146,10 @@
user or factory image to be loaded.
Default is to reload on PERST whichever image the card has
loaded.
+
+What: /sys/class/cxl/<card>/reset
+Date: October 2014
+Contact: linuxppc-dev@lists.ozlabs.org
+Description: write only
+ Writing 1 will issue a PERST to card which may cause the card
+ to reload the FPGA depending on load_image_on_perst.