firmware: xilinx: Release all peripheral devices from firmware

Browse source

During a kexec restart, only the kernel is reloaded while devices
allocated in firmware persist, causing state mismatches between the
kernel and firmware.

Introduce PM_DEV_ALL_PERIPH node ID (0x18224FFFU) to release all
peripheral devices during kexec. On graceful restarts, this happens in
zynqmp_firmware_shutdown(). On crash kernel restarts, it happens in
zynqmp_firmware_probe() of the reloaded kernel.

Releasing all peripherals depends on firmware support for the
PM_DEV_ALL_PERIPH node ID. On firmware that does not implement it (the
feature check reports a version below PM_API_VERSION_3) the release is
skipped and a warning such as "Bulk device release is not supported by
firmware" is logged, e.g. on Versal NET firmware that predates this API.

Signed-off-by: Jay Buddhabhatti <jay.buddhabhatti@amd.com>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Reviewed-by: Prasanna Kumar T S M <ptsm@linux.microsoft.com>
Link: https://patch.msgid.link/20260729122522.3732875-3-jay.buddhabhatti@amd.com
Signed-off-by: Michal Simek <michal.simek@amd.com>

...

This commit is contained in:

Jay Buddhabhatti 2026-07-29 05:25:21 -07:00 • committed by Michal Simek

parent 00bee072c8

commit 84dbfa5519

2 changed files with 18 additions and 1 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

15

drivers/firmware/xilinx/zynqmp.c

View file

4

include/linux/firmware/xlnx-zynqmp.h

View file