Commit b5af4f27 authored by Paul Mackerras's avatar Paul Mackerras Committed by Michael Ellerman

powerpc: Add CPU feature bits for TM bug workarounds on POWER9 v2.2

This adds a CPU feature bit which is set for POWER9 "Nimbus" DD2.2
processors which will be used to enable the hypervisor to assist
hardware with the handling of checkpointed register values while the
CPU is in suspend state, in order to work around hardware bugs.  The
hardware assistance for these workarounds introduced a new hardware
bug relating to the XER[SO] bit.  We add a separate feature bit for
this bug in case future chips fix it while still requiring the
hypervisor assistance with suspend state.

When the dt_cpu_ftrs subsystem is in use, the software assistance can
be enabled using a "tm-suspend-hypervisor-assist" node in the device
tree, and a "tm-suspend-xer-so-bug" node enables the workarounds for
the XER[SO] bug.  In the absence of such nodes, a quirk enables both
for POWER9 "Nimbus" DD2.2 processors.
Signed-off-by: default avatarPaul Mackerras <paulus@ozlabs.org>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 9bbf0b57
...@@ -213,6 +213,8 @@ static inline void cpu_feature_keys_init(void) { } ...@@ -213,6 +213,8 @@ static inline void cpu_feature_keys_init(void) { }
#define CPU_FTR_PMAO_BUG LONG_ASM_CONST(0x0000020000000000) #define CPU_FTR_PMAO_BUG LONG_ASM_CONST(0x0000020000000000)
#define CPU_FTR_POWER9_DD1 LONG_ASM_CONST(0x0000040000000000) #define CPU_FTR_POWER9_DD1 LONG_ASM_CONST(0x0000040000000000)
#define CPU_FTR_POWER9_DD2_1 LONG_ASM_CONST(0x0000080000000000) #define CPU_FTR_POWER9_DD2_1 LONG_ASM_CONST(0x0000080000000000)
#define CPU_FTR_P9_TM_HV_ASSIST LONG_ASM_CONST(0x0000100000000000)
#define CPU_FTR_P9_TM_XER_SO_BUG LONG_ASM_CONST(0x0000200000000000)
#ifndef __ASSEMBLY__ #ifndef __ASSEMBLY__
...@@ -469,6 +471,8 @@ static inline void cpu_feature_keys_init(void) { } ...@@ -469,6 +471,8 @@ static inline void cpu_feature_keys_init(void) { }
(~CPU_FTR_SAO)) (~CPU_FTR_SAO))
#define CPU_FTRS_POWER9_DD2_0 CPU_FTRS_POWER9 #define CPU_FTRS_POWER9_DD2_0 CPU_FTRS_POWER9
#define CPU_FTRS_POWER9_DD2_1 (CPU_FTRS_POWER9 | CPU_FTR_POWER9_DD2_1) #define CPU_FTRS_POWER9_DD2_1 (CPU_FTRS_POWER9 | CPU_FTR_POWER9_DD2_1)
#define CPU_FTRS_POWER9_DD2_2 (CPU_FTRS_POWER9 | CPU_FTR_P9_TM_HV_ASSIST | \
CPU_FTR_P9_TM_XER_SO_BUG)
#define CPU_FTRS_CELL (CPU_FTR_LWSYNC | \ #define CPU_FTRS_CELL (CPU_FTR_LWSYNC | \
CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | \ CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | \
CPU_FTR_ALTIVEC_COMP | CPU_FTR_MMCRA | CPU_FTR_SMT | \ CPU_FTR_ALTIVEC_COMP | CPU_FTR_MMCRA | CPU_FTR_SMT | \
...@@ -488,7 +492,8 @@ static inline void cpu_feature_keys_init(void) { } ...@@ -488,7 +492,8 @@ static inline void cpu_feature_keys_init(void) { }
CPU_FTRS_POWER6 | CPU_FTRS_POWER7 | CPU_FTRS_POWER8E | \ CPU_FTRS_POWER6 | CPU_FTRS_POWER7 | CPU_FTRS_POWER8E | \
CPU_FTRS_POWER8 | CPU_FTRS_POWER8_DD1 | CPU_FTRS_CELL | \ CPU_FTRS_POWER8 | CPU_FTRS_POWER8_DD1 | CPU_FTRS_CELL | \
CPU_FTRS_PA6T | CPU_FTR_VSX | CPU_FTRS_POWER9 | \ CPU_FTRS_PA6T | CPU_FTR_VSX | CPU_FTRS_POWER9 | \
CPU_FTRS_POWER9_DD1 | CPU_FTRS_POWER9_DD2_1) CPU_FTRS_POWER9_DD1 | CPU_FTRS_POWER9_DD2_1 | \
CPU_FTRS_POWER9_DD2_2)
#endif #endif
#else #else
enum { enum {
......
...@@ -553,11 +553,31 @@ static struct cpu_spec __initdata cpu_specs[] = { ...@@ -553,11 +553,31 @@ static struct cpu_spec __initdata cpu_specs[] = {
.machine_check_early = __machine_check_early_realmode_p9, .machine_check_early = __machine_check_early_realmode_p9,
.platform = "power9", .platform = "power9",
}, },
{ /* Power9 DD 2.1 or later (see DD2.0 above) */ { /* Power9 DD 2.1 */
.pvr_mask = 0xffffefff,
.pvr_value = 0x004e0201,
.cpu_name = "POWER9 (raw)",
.cpu_features = CPU_FTRS_POWER9_DD2_1,
.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",
.oprofile_type = PPC_OPROFILE_INVALID,
.cpu_setup = __setup_cpu_power9,
.cpu_restore = __restore_cpu_power9,
.flush_tlb = __flush_tlb_power9,
.machine_check_early = __machine_check_early_realmode_p9,
.platform = "power9",
},
{ /* Power9 DD2.2 or later */
.pvr_mask = 0xffff0000, .pvr_mask = 0xffff0000,
.pvr_value = 0x004e0000, .pvr_value = 0x004e0000,
.cpu_name = "POWER9 (raw)", .cpu_name = "POWER9 (raw)",
.cpu_features = CPU_FTRS_POWER9_DD2_1, .cpu_features = CPU_FTRS_POWER9_DD2_2,
.cpu_user_features = COMMON_USER_POWER9, .cpu_user_features = COMMON_USER_POWER9,
.cpu_user_features2 = COMMON_USER2_POWER9, .cpu_user_features2 = COMMON_USER2_POWER9,
.mmu_features = MMU_FTRS_POWER9, .mmu_features = MMU_FTRS_POWER9,
......
...@@ -589,6 +589,8 @@ static struct dt_cpu_feature_match __initdata ...@@ -589,6 +589,8 @@ static struct dt_cpu_feature_match __initdata
{"virtual-page-class-key-protection", feat_enable, 0}, {"virtual-page-class-key-protection", feat_enable, 0},
{"transactional-memory", feat_enable_tm, CPU_FTR_TM}, {"transactional-memory", feat_enable_tm, CPU_FTR_TM},
{"transactional-memory-v3", feat_enable_tm, 0}, {"transactional-memory-v3", feat_enable_tm, 0},
{"tm-suspend-hypervisor-assist", feat_enable, CPU_FTR_P9_TM_HV_ASSIST},
{"tm-suspend-xer-so-bug", feat_enable, CPU_FTR_P9_TM_XER_SO_BUG},
{"idle-nap", feat_enable_idle_nap, 0}, {"idle-nap", feat_enable_idle_nap, 0},
{"alignment-interrupt-dsisr", feat_enable_align_dsisr, 0}, {"alignment-interrupt-dsisr", feat_enable_align_dsisr, 0},
{"idle-stop", feat_enable_idle_stop, 0}, {"idle-stop", feat_enable_idle_stop, 0},
...@@ -708,6 +710,9 @@ static __init void cpufeatures_cpu_quirks(void) ...@@ -708,6 +710,9 @@ static __init void cpufeatures_cpu_quirks(void)
cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD1; cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD1;
else if ((version & 0xffffefff) == 0x004e0201) else if ((version & 0xffffefff) == 0x004e0201)
cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1; cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1;
else if ((version & 0xffffefff) == 0x004e0202)
cur_cpu_spec->cpu_features |= CPU_FTR_P9_TM_HV_ASSIST |
CPU_FTR_P9_TM_XER_SO_BUG;
} }
static void __init cpufeatures_setup_finished(void) static void __init cpufeatures_setup_finished(void)
......
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