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microblaze: reset: Provide a power off handler through an unaligned PC

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microblaze is missing a generic architecture-wide power off mechanism.

To enable KUnit for microblaze it is necessary for KUnit to shut down
the machine in a way that QEMU will recognize. The machines emulated by
QEMU do not provide machine-specific power off functionality which could
be used.
However at least the petalogix-s3adsp1800 machine will abort if an
unaligned instruction is executed. An ugly message will be printed but
that is not an issue for KUnit.

Make use of this to provide a power off handler.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Tested-by: David Gow <david@davidgow.net>
Link: https://patch.msgid.link/20260914-kunit-microblaze-v2-4-7d5756e858f8@weissschuh.net
Signed-off-by: Michal Simek <michal.simek@amd.com>
This commit is contained in:
Thomas Weißschuh 2026-09-14 01:50:11 +02:00 committed by Michal Simek
parent 4ebcbacb0b
commit 7d376ea6a7
2 changed files with 30 additions and 0 deletions
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9
arch/microblaze/Kconfig
View File

@ -216,3 +216,12 @@ config MB_MANAGER
Say N here unless you know what you are doing.
endmenu
config MB_POWER_OFF_THROUGH_UNALIGNED_PC
bool "Power off through unaligned PC"
help
This options adds a power off handler which executes an unaligned PC
so the machine resets in a generic way. This works for the
petalogix-s3adsp1800 QEMU machine.
Say N here unless you know what you are doing.

21
arch/microblaze/kernel/reset.c
View File

@ -41,3 +41,24 @@ void machine_restart(char *cmd)
pr_emerg("Reboot failed -- System halted\n");
while (1);
}
#ifdef CONFIG_MB_POWER_OFF_THROUGH_UNALIGNED_PC
static int unaligned_pc_sys_off(struct sys_off_data *data)
{
__asm__(
"bri 1\n"
);
return NOTIFY_DONE;
}
static int __init register_unaligned_pc_sys_off(void)
{
struct sys_off_handler *sys_off;
sys_off = register_sys_off_handler(SYS_OFF_MODE_POWER_OFF, SYS_OFF_PRIO_LOW,
unaligned_pc_sys_off, NULL);
return PTR_ERR_OR_ZERO(sys_off);
}
device_initcall(register_unaligned_pc_sys_off);
#endif /* CONFIG_MB_POWER_OFF_THROUGH_UNALIGNED_PC */