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arm64: Clear OSDLR_EL1 on CPU boot

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commit 6fda41bf12615ee7c3ddac88155099b1a8cf8d00 upstream.

Some firmwares may reboot CPUs with OS Double Lock set. Make sure that
it is unlocked, in order to use debug exceptions.

Cc: <stable@vger.kernel.org>
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jean-Philippe Brucker 2019-04-08 18:17:18 +01:00 • committed by Greg Kroah-Hartman
parent 26e7d2ad97
commit f273cd1655
1 changed files with 1 additions and 0 deletions

1
arch/arm64/kernel/debug-monitors.c
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@ -135,6 +135,7 @@ NOKPROBE_SYMBOL(disable_debug_monitors);
*/
static int clear_os_lock(unsigned int cpu)
{
write_sysreg(0, osdlr_el1);
write_sysreg(0, oslar_el1);
isb();
return 0;