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cxl: Add ability to reset the card

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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>
This commit is contained in:
Ryan Grimm 2015-01-19 11:52:51 -06:00 • committed by Michael Ellerman
parent 1212aa1c8c
commit 62fa19d4b4
4 changed files with 63 additions and 0 deletions
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7
Documentation/ABI/testing/sysfs-class-cxl
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@ -146,3 +146,10 @@ Description: read/write
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.