powerpc: Add the DAWR support to the set_break()
This adds DAWR supoprt to the set_break().
It does both bare metal and PAPR versions of setting the DAWR.
There is still some work we can do to make full use of the watchpoint but that
will come later.
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index c16c1c2..8d56452 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -407,10 +407,33 @@
return __set_dabr(dabr, dabrx);
}
+static inline int set_dawr(struct arch_hw_breakpoint *brk)
+{
+ unsigned long dawr, dawrx;
+
+ dawr = brk->address;
+
+ dawrx = (brk->type & (HW_BRK_TYPE_READ | HW_BRK_TYPE_WRITE)) \
+ << (63 - 58); //* read/write bits */
+ dawrx |= ((brk->type & (HW_BRK_TYPE_TRANSLATE)) >> 2) \
+ << (63 - 59); //* translate */
+ dawrx |= (brk->type & (HW_BRK_TYPE_PRIV_ALL)) \
+ >> 3; //* PRIM bits */
+
+ if (ppc_md.set_dawr)
+ return ppc_md.set_dawr(dawr, dawrx);
+ mtspr(SPRN_DAWR, dawr);
+ mtspr(SPRN_DAWRX, dawrx);
+ return 0;
+}
+
int set_break(struct arch_hw_breakpoint *brk)
{
__get_cpu_var(current_brk) = *brk;
+ if (cpu_has_feature(CPU_FTR_DAWR))
+ return set_dawr(brk);
+
return set_dabr(brk);
}