[v3 07/15] powerpc/perf: Add power10_feat to dt_cpu_ftrs

[Athira Rajeev <atrajeev@linux.vnet.ibm.com>]

From: Madhavan Srinivasan <maddy@linux.ibm.com>

Add power10 feature function to dt_cpu_ftrs.c along
with a power10 specific init() to initialize pmu sprs,
sets the oprofile_cpu_type and cpu_features. This will
enable performance monitoring unit(PMU) for Power10
in CPU features with "performance-monitor-power10".

For PowerISA v3.1, BHRB disable is controlled via Monitor Mode
Control Register A (MMCRA) bit, namely "BHRB Recording Disable
(BHRBRD)". This patch initializes MMCRA BHRBRD to disable BHRB
feature at boot for power10.

Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
---
 arch/powerpc/include/asm/reg.h        |  3 +++
 arch/powerpc/kernel/cpu_setup_power.S |  8 ++++++++
 arch/powerpc/kernel/dt_cpu_ftrs.c     | 26 ++++++++++++++++++++++++++
 3 files changed, 37 insertions(+)

diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index 21a1b2d..900ada1 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -1068,6 +1068,9 @@
 #define MMCR0_PMC2_LOADMISSTIME	0x5
 #endif
 
+/* BHRB disable bit for PowerISA v3.10 */
+#define MMCRA_BHRB_DISABLE	0x0000002000000000
+
 /*
  * SPRG usage:
  *
diff --git a/arch/powerpc/kernel/cpu_setup_power.S b/arch/powerpc/kernel/cpu_setup_power.S
index efdcfa7..b8e0d1e 100644
--- a/arch/powerpc/kernel/cpu_setup_power.S
+++ b/arch/powerpc/kernel/cpu_setup_power.S
@@ -94,6 +94,7 @@ _GLOBAL(__restore_cpu_power8)
 _GLOBAL(__setup_cpu_power10)
 	mflr	r11
 	bl	__init_FSCR_power10
+	bl	__init_PMU_ISA31
 	b	1f
 
 _GLOBAL(__setup_cpu_power9)
@@ -233,3 +234,10 @@ __init_PMU_ISA207:
 	li	r5,0
 	mtspr	SPRN_MMCRS,r5
 	blr
+
+__init_PMU_ISA31:
+	li	r5,0
+	mtspr	SPRN_MMCR3,r5
+	LOAD_REG_IMMEDIATE(r5, MMCRA_BHRB_DISABLE)
+	mtspr	SPRN_MMCRA,r5
+	blr
diff --git a/arch/powerpc/kernel/dt_cpu_ftrs.c b/arch/powerpc/kernel/dt_cpu_ftrs.c
index 3a40951..f482286 100644
--- a/arch/powerpc/kernel/dt_cpu_ftrs.c
+++ b/arch/powerpc/kernel/dt_cpu_ftrs.c
@@ -450,6 +450,31 @@ static int __init feat_enable_pmu_power9(struct dt_cpu_feature *f)
 	return 1;
 }
 
+static void init_pmu_power10(void)
+{
+	init_pmu_power9();
+
+	mtspr(SPRN_MMCR3, 0);
+	mtspr(SPRN_MMCRA, MMCRA_BHRB_DISABLE);
+}
+
+static int __init feat_enable_pmu_power10(struct dt_cpu_feature *f)
+{
+	hfscr_pmu_enable();
+
+	init_pmu_power10();
+	init_pmu_registers = init_pmu_power10;
+
+	cur_cpu_spec->cpu_features |= CPU_FTR_MMCRA;
+	cur_cpu_spec->cpu_user_features |= PPC_FEATURE_PSERIES_PERFMON_COMPAT;
+
+	cur_cpu_spec->num_pmcs          = 6;
+	cur_cpu_spec->pmc_type          = PPC_PMC_IBM;
+	cur_cpu_spec->oprofile_cpu_type = "ppc64/power10";
+
+	return 1;
+}
+
 static int __init feat_enable_tm(struct dt_cpu_feature *f)
 {
 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
@@ -639,6 +664,7 @@ struct dt_cpu_feature_match {
 	{"pc-relative-addressing", feat_enable, 0},
 	{"machine-check-power9", feat_enable_mce_power9, 0},
 	{"performance-monitor-power9", feat_enable_pmu_power9, 0},
+	{"performance-monitor-power10", feat_enable_pmu_power10, 0},
 	{"event-based-branch-v3", feat_enable, 0},
 	{"random-number-generator", feat_enable, 0},
 	{"system-call-vectored", feat_disable, 0},
-- 
1.8.3.1