[PATCH v2 4/8] powerpc/watchpoint: Set CPU_FTR_DAWR1 based on pa-features bit

From: Ravi Bangoria
Date: Wed Jun 03 2020 - 23:35:54 EST


As per the PAPR, bit 0 of byte 64 in pa-features property indicates
availability of 2nd DAWR registers. i.e. If this bit is set, 2nd
DAWR is present, otherwise not. Host generally uses "cpu-features",
which masks "pa-features". But "cpu-features" are still not used for
guests and thus this change is mostly applicable for guests only.

Signed-off-by: Ravi Bangoria <ravi.bangoria@xxxxxxxxxxxxx>
---
arch/powerpc/kernel/prom.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 6a3bac357e24..34272cef8ae6 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -175,6 +175,8 @@ static struct ibm_pa_feature {
*/
{ .pabyte = 22, .pabit = 0, .cpu_features = CPU_FTR_TM_COMP,
.cpu_user_ftrs2 = PPC_FEATURE2_HTM_COMP | PPC_FEATURE2_HTM_NOSC_COMP },
+
+ { .pabyte = 64, .pabit = 0, .cpu_features = CPU_FTR_DAWR1 },
};

static void __init scan_features(unsigned long node, const unsigned char *ftrs,
--
2.26.2