[PATCH 3/4] powerpc: Add Power12 architected mode

[Mahesh Salgaonkar <mahesh@linux.ibm.com>]

From: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>

PVR value of 0x0f000008 means we are arch v3.2 compliant (i.e.
Power12). This is used by phyp and kvm when booting as a pseries guest
to detect the presence of new Power12 features and to enable the
appropriate hwcap and facility bits.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Mahesh Salgaonkar <mahesh@linux.ibm.com>
---
 arch/powerpc/include/asm/prom.h           |  1 +
 arch/powerpc/include/uapi/asm/cputable.h  |  1 +
 arch/powerpc/kernel/cpu_specs_book3s_64.h | 14 ++++++++++++++
 arch/powerpc/kernel/prom_init.c           | 12 ++++++++++--
 4 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/prom.h b/arch/powerpc/include/asm/prom.h
index f4991d10d89e..cd025c7225ee 100644
--- a/arch/powerpc/include/asm/prom.h
+++ b/arch/powerpc/include/asm/prom.h
@@ -118,6 +118,7 @@ extern unsigned int boot_cpu_node_count;
 
 #define OV1_PPC_3_00		0x80	/* set if we support PowerPC 3.00 */
 #define OV1_PPC_3_1			0x40	/* set if we support PowerPC 3.1 */
+#define OV1_PPC_3_2			0x20	/* set if we support PowerPC 3.2 */
 
 /* Option vector 2: Open Firmware options supported */
 #define OV2_REAL_MODE		0x20	/* set if we want OF in real mode */
diff --git a/arch/powerpc/include/uapi/asm/cputable.h b/arch/powerpc/include/uapi/asm/cputable.h
index bc9bd225f587..68215b7ce67e 100644
--- a/arch/powerpc/include/uapi/asm/cputable.h
+++ b/arch/powerpc/include/uapi/asm/cputable.h
@@ -53,6 +53,7 @@
 #define PPC_FEATURE2_ARCH_3_1		0x00040000 /* ISA 3.1 */
 #define PPC_FEATURE2_MMA		0x00020000 /* Matrix Multiply Assist */
 #define PPC_FEATURE2_ARCH_3_2		0x00010000 /* ISA 3.2 */
+#define PPC_FEATURE2_DMF		0x00008000 /* Dense Math Facility */
 
 /*
  * IMPORTANT!
diff --git a/arch/powerpc/kernel/cpu_specs_book3s_64.h b/arch/powerpc/kernel/cpu_specs_book3s_64.h
index 7619dd157646..26fa40aa34db 100644
--- a/arch/powerpc/kernel/cpu_specs_book3s_64.h
+++ b/arch/powerpc/kernel/cpu_specs_book3s_64.h
@@ -303,6 +303,20 @@ static struct cpu_spec cpu_specs[] __initdata = {
 		.cpu_restore		= __restore_cpu_power10,
 		.platform		= "power11",
 	},
+	{	/* 3.2-compliant processor, i.e. Power12 "architected" mode */
+		.pvr_mask		= 0xffffffff,
+		.pvr_value		= 0x0f000008,
+		.cpu_name		= "Power12 (architected)",
+		.cpu_features		= CPU_FTRS_POWER12,
+		.cpu_user_features	= COMMON_USER_POWER12,
+		.cpu_user_features2	= COMMON_USER2_POWER12,
+		.mmu_features		= MMU_FTRS_POWER12,
+		.icache_bsize		= 128,
+		.dcache_bsize		= 128,
+		.cpu_setup		= __setup_cpu_power12,
+		.cpu_restore		= __restore_cpu_power12,
+		.platform		= "power12",
+	},
 	{	/* Power7 */
 		.pvr_mask		= 0xffff0000,
 		.pvr_value		= 0x003f0000,
diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index f4f92cdaaa6b..0d54718b0929 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -947,7 +947,7 @@ struct option_vector7 {
 } __packed;
 
 struct ibm_arch_vec {
-	struct { __be32 mask, val; } pvrs[16];
+	struct { __be32 mask, val; } pvrs[18];
 
 	u8 num_vectors;
 
@@ -1015,6 +1015,14 @@ static const struct ibm_arch_vec ibm_architecture_vec_template __initconst = {
 			.mask = cpu_to_be32(0xffff0000), /* POWER11 */
 			.val  = cpu_to_be32(0x00820000),
 		},
+		{
+			.mask = cpu_to_be32(0xffff0000), /* POWER12 */
+			.val  = cpu_to_be32(0x00830000),
+		},
+		{
+			.mask = cpu_to_be32(0xffffffff), /* all 3.2-compliant */
+			.val  = cpu_to_be32(0x0f000008),
+		},
 		{
 			.mask = cpu_to_be32(0xffffffff), /* P11 compliant */
 			.val  = cpu_to_be32(0x0f000007),
@@ -1048,7 +1056,7 @@ static const struct ibm_arch_vec ibm_architecture_vec_template __initconst = {
 		.byte1 = 0,
 		.arch_versions = OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
 				 OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06 | OV1_PPC_2_07,
-		.arch_versions3 = OV1_PPC_3_00 | OV1_PPC_3_1,
+		.arch_versions3 = OV1_PPC_3_00 | OV1_PPC_3_1 | OV1_PPC_3_2,
 	},
 
 	.vec2_len = VECTOR_LENGTH(sizeof(struct option_vector2)),
-- 
2.55.0