powerpc: Don't write to DABR on >= Power8 if DAWR is disabled

flush_thread() calls __set_breakpoint() via set_debug_reg_defaults()
without checking ppc_breakpoint_available(). On Power8 or later CPUs
which have the DAWR feature disabled that will cause a write to the
DABR which is incorrect as those CPUs don't have a DABR.

Fix it two ways, by checking ppc_breakpoint_available() in
set_debug_reg_defaults(), and also by reworking __set_breakpoint() to
only write to DABR on Power7 or earlier.

Fixes: 9654153158d3 ("powerpc: Disable DAWR in the base POWER9 CPU features")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Rework the logic in __set_breakpoint()]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 8 insertions, 2 deletions

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 24a591b4dbe9..1237f13fed51 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -718,7 +718,8 @@ static void set_debug_reg_defaults(struct thread_struct *thread)
 {
         thread->hw_brk.address = 0;
         thread->hw_brk.type = 0;
-        set_breakpoint(&thread->hw_brk);
+        if (ppc_breakpoint_available())
+                set_breakpoint(&thread->hw_brk);
 }
 #endif /* !CONFIG_HAVE_HW_BREAKPOINT */
 #endif  /* CONFIG_PPC_ADV_DEBUG_REGS */
@@ -815,9 +816,14 @@ void __set_breakpoint(struct arch_hw_breakpoint *brk)
         memcpy(this_cpu_ptr(&current_brk), brk, sizeof(*brk));
 
         if (cpu_has_feature(CPU_FTR_DAWR))
+                // Power8 or later
                 set_dawr(brk);
-        else
+        else if (!cpu_has_feature(CPU_FTR_ARCH_207S))
+                // Power7 or earlier
                 set_dabr(brk);
+        else
+                // Shouldn't happen due to higher level checks
+                WARN_ON_ONCE(1);
 }
 
 void set_breakpoint(struct arch_hw_breakpoint *brk)