arm64: debug: clear mdscr_el1 instead of taking the OS lock

During boot, we take the debug OS lock before interrupts are enabled.
This is required to prevent clearing of PSTATE.D on the interrupt entry
path, which could result in spurious debug exceptions before we've got
round to resetting things like the hardware breakpoints registers to a
sane state.

A problem with this approach is that taking the OS lock prevents an
external JTAG debugger from debugging the system, which is especially
irritating during boot, where JTAG debugging can be most useful.

This patch clears mdscr_el1 rather than taking the lock, clearing the
MDE and KDE bits and preventing self-hosted hardware debug exceptions
from occurring.

Tested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: stable@vger.kernel.org

2 files changed, 1 insertions, 4 deletions

diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c
index 0c3ba9f51376..f4726dc054b3 100644
--- a/arch/arm64/kernel/debug-monitors.c
+++ b/arch/arm64/kernel/debug-monitors.c
@@ -136,8 +136,6 @@ void disable_debug_monitors(enum debug_el el)
  */
 static void clear_os_lock(void *unused)
 {
-        asm volatile("msr mdscr_el1, %0" : : "r" (0));
-        isb();
         asm volatile("msr oslar_el1, %0" : : "r" (0));
         isb();
 }
diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S
index f1d8b9bbfdad..a82ae8868077 100644
--- a/arch/arm64/mm/proc.S
+++ b/arch/arm64/mm/proc.S
@@ -119,8 +119,7 @@ ENTRY(__cpu_setup)
 
         mov     x0, #3 << 20
         msr     cpacr_el1, x0                   // Enable FP/ASIMD
-        mov     x0, #1
-        msr     oslar_el1, x0                   // Set the debug OS lock
+        msr     mdscr_el1, xzr                  // Reset mdscr_el1
         tlbi    vmalle1is                       // invalidate I + D TLBs
         /*
          * Memory region attributes for LPAE: