Subject: [PATCH 1/2] powerpc/64s: POWER9 DD2.3 CPU feature flag fixes

From: Nicholas Piggin <[email-masked]>
Date: Mon, 26 Jul 2021 13:17:29 +1000

DD2.3 missed out on getting its feature flag bits.

This meant when booting with dt-cpu-ftrs, CPU_FTR_P9_TM_HV_ASSIST is
missing (unless the firmware contains it, which mine does not seem to).
And when booting without, CPU_FTR_P9_TM_XER_SO_BUG is set.

In practice this doesn't make any difference to pseries guests, only
powernv.

Signed-off-by: Nicholas Piggin <[email-masked]>
---
 arch/powerpc/include/asm/cputable.h |  2 ++
 arch/powerpc/kernel/cputable.c      | 22 ++++++++++++++++++++--
 arch/powerpc/kernel/dt_cpu_ftrs.c   | 14 +++++---------
 3 files changed, 27 insertions(+), 11 deletions(-)

diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h
index e85c849214a2..46bae9624784 100644
--- a/arch/powerpc/include/asm/cputable.h
+++ b/arch/powerpc/include/asm/cputable.h
@@ -440,6 +440,8 @@ static inline void cpu_feature_keys_init(void) { }
 #define CPU_FTRS_POWER9_DD2_2 (CPU_FTRS_POWER9 | CPU_FTR_POWER9_DD2_1 | \
 			       CPU_FTR_P9_TM_HV_ASSIST | \
 			       CPU_FTR_P9_TM_XER_SO_BUG)
+#define CPU_FTRS_POWER9_DD2_3 (CPU_FTRS_POWER9 | CPU_FTR_POWER9_DD2_1 | \
+			       CPU_FTR_P9_TM_HV_ASSIST)
 #define CPU_FTRS_POWER10 (CPU_FTR_LWSYNC | \
 	    CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | CPU_FTR_ARCH_206 |\
 	    CPU_FTR_MMCRA | CPU_FTR_SMT | \
diff --git a/arch/powerpc/kernel/cputable.c b/arch/powerpc/kernel/cputable.c
index ae0fdef0ac11..9ab97d1fd5a2 100644
--- a/arch/powerpc/kernel/cputable.c
+++ b/arch/powerpc/kernel/cputable.c
@@ -487,11 +487,29 @@ static struct cpu_spec __initdata cpu_specs[] = {
 		.machine_check_early	= __machine_check_early_realmode_p9,
 		.platform		= "power9",
 	},
-	{	/* Power9 DD2.2 or later */
+	{	/* Power9 DD 2.2 */
+		.pvr_mask		= 0xffffefff,
+		.pvr_value		= 0x004e0202,
+		.cpu_name		= "POWER9 (raw)",
+		.cpu_features		= CPU_FTRS_POWER9_DD2_2,
+		.cpu_user_features	= COMMON_USER_POWER9,
+		.cpu_user_features2	= COMMON_USER2_POWER9,
+		.mmu_features		= MMU_FTRS_POWER9,
+		.icache_bsize		= 128,
+		.dcache_bsize		= 128,
+		.num_pmcs		= 6,
+		.pmc_type		= PPC_PMC_IBM,
+		.oprofile_cpu_type	= "ppc64/power9",
+		.cpu_setup		= __setup_cpu_power9,
+		.cpu_restore		= __restore_cpu_power9,
+		.machine_check_early	= __machine_check_early_realmode_p9,
+		.platform		= "power9",
+	},
+	{	/* Power9 DD 2.3 or later */
 		.pvr_mask		= 0xffff0000,
 		.pvr_value		= 0x004e0000,
 		.cpu_name		= "POWER9 (raw)",
-		.cpu_features		= CPU_FTRS_POWER9_DD2_2,
+		.cpu_features		= CPU_FTRS_POWER9_DD2_3,
 		.cpu_user_features	= COMMON_USER_POWER9,
 		.cpu_user_features2	= COMMON_USER2_POWER9,
 		.mmu_features		= MMU_FTRS_POWER9,
diff --git a/arch/powerpc/kernel/dt_cpu_ftrs.c b/arch/powerpc/kernel/dt_cpu_ftrs.c
index 358aee7c2d79..af95f337e54b 100644
--- a/arch/powerpc/kernel/dt_cpu_ftrs.c
+++ b/arch/powerpc/kernel/dt_cpu_ftrs.c
@@ -764,18 +764,14 @@ static __init void cpufeatures_cpu_quirks(void)
 	 * Not all quirks can be derived from the cpufeatures device tree.
 	 */
 	if ((version & 0xffffefff) == 0x004e0200) {
-		/* DD2.0 has no feature flag */
-		cur_cpu_spec->cpu_features |= CPU_FTR_P9_RADIX_PREFETCH_BUG;
+		cur_cpu_spec->cpu_features |= CPU_FTRS_POWER9_DD2_0;
 	} else if ((version & 0xffffefff) == 0x004e0201) {
-		cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1;
-		cur_cpu_spec->cpu_features |= CPU_FTR_P9_RADIX_PREFETCH_BUG;
+		cur_cpu_spec->cpu_features |= CPU_FTRS_POWER9_DD2_1;
 	} else if ((version & 0xffffefff) == 0x004e0202) {
-		cur_cpu_spec->cpu_features |= CPU_FTR_P9_TM_HV_ASSIST;
-		cur_cpu_spec->cpu_features |= CPU_FTR_P9_TM_XER_SO_BUG;
-		cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1;
+		cur_cpu_spec->cpu_features |= CPU_FTRS_POWER9_DD2_2;
 	} else if ((version & 0xffff0000) == 0x004e0000) {
-		/* DD2.1 and up have DD2_1 */
-		cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1;
+		/* DD2.3 and up */
+		cur_cpu_spec->cpu_features |= CPU_FTRS_POWER9_DD2_3;
 	}
 
 	if ((version & 0xffff0000) == 0x004e0000) {
-- 
2.23.0