[PATCH 3/4] powerpc: Add Power12 architected mode
From: Mahesh Salgaonkar <mahesh@linux.ibm.com>
Date: 2026-07-29 14:54:38
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
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