Messages in this thread Patch in this message | | | From | Ravi Bangoria <> | Subject | [PATCH v2 4/8] powerpc/watchpoint: Set CPU_FTR_DAWR1 based on pa-features bit | Date | Thu, 4 Jun 2020 09:04:39 +0530 |
| |
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@linux.ibm.com> --- 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
| |