// SPDX-License-Identifier: GPL-2.0-only /* * Copyright 2017, Nicholas Piggin, IBM Corporation */ #define pr_fmt(fmt) "dt-cpu-ftrs: " fmt #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* Device-tree visible constants follow */ #define ISA_V2_07B 2070 #define ISA_V3_0B 3000 #define USABLE_PR (1U << 0) #define USABLE_OS (1U << 1) #define USABLE_HV (1U << 2) #define HV_SUPPORT_HFSCR (1U << 0) #define OS_SUPPORT_FSCR (1U << 0) /* For parsing, we define all bits set as "NONE" case */ #define HV_SUPPORT_NONE 0xffffffffU #define OS_SUPPORT_NONE 0xffffffffU struct dt_cpu_feature { const char *name; uint32_t isa; uint32_t usable_privilege; uint32_t hv_support; uint32_t os_support; uint32_t hfscr_bit_nr; uint32_t fscr_bit_nr; uint32_t hwcap_bit_nr; /* fdt parsing */ unsigned long node; int enabled; int disabled; }; #define MMU_FTRS_HASH_BASE (MMU_FTRS_POWER8) #define COMMON_USER_BASE (PPC_FEATURE_32 | PPC_FEATURE_64 | \ PPC_FEATURE_ARCH_2_06 |\ PPC_FEATURE_ICACHE_SNOOP) #define COMMON_USER2_BASE (PPC_FEATURE2_ARCH_2_07 | \ PPC_FEATURE2_ISEL) /* * Set up the base CPU */ extern long __machine_check_early_realmode_p8(struct pt_regs *regs); extern long __machine_check_early_realmode_p9(struct pt_regs *regs); static int hv_mode; static struct { u64 lpcr; u64 lpcr_clear; u64 hfscr; u64 fscr; } system_registers; static void (*init_pmu_registers)(void); static void __restore_cpu_cpufeatures(void) { u64 lpcr; /* * LPCR is restored by the power on engine already. It can be changed * after early init e.g., by radix enable, and we have no unified API * for saving and restoring such SPRs. * * This ->restore hook should really be removed from idle and register * restore moved directly into the idle restore code, because this code * doesn't know how idle is implemented or what it needs restored here. * * The best we can do to accommodate secondary boot and idle restore * for now is "or" LPCR with existing. */ lpcr = mfspr(SPRN_LPCR); lpcr |= system_registers.lpcr; lpcr &= ~system_registers.lpcr_clear; mtspr(SPRN_LPCR, lpcr); if (hv_mode) { mtspr(SPRN_LPID, 0); mtspr(SPRN_HFSCR, system_registers.hfscr); mtspr(SPRN_PCR, 0); } mtspr(SPRN_FSCR, system_registers.fscr); if (init_pmu_registers) init_pmu_registers(); } static char dt_cpu_name[64]; static struct cpu_spec __initdata base_cpu_spec = { .cpu_name = NULL, .cpu_features = CPU_FTRS_DT_CPU_BASE, .cpu_user_features = COMMON_USER_BASE, .cpu_user_features2 = COMMON_USER2_BASE, .mmu_features = 0, .icache_bsize = 32, /* minimum block size, fixed by */ .dcache_bsize = 32, /* cache info init. */ .num_pmcs = 0, .pmc_type = PPC_PMC_DEFAULT, .oprofile_cpu_type = NULL, .oprofile_type = PPC_OPROFILE_INVALID, .cpu_setup = NULL, .cpu_restore = __restore_cpu_cpufeatures, .machine_check_early = NULL, .platform = NULL, }; static void __init cpufeatures_setup_cpu(void) { set_cur_cpu_spec(&base_cpu_spec); cur_cpu_spec->pvr_mask = -1; cur_cpu_spec->pvr_value = mfspr(SPRN_PVR); /* Initialize the base environment -- clear FSCR/HFSCR. */ hv_mode = !!(mfmsr() & MSR_HV); if (hv_mode) { /* CPU_FTR_HVMODE is used early in PACA setup */ cur_cpu_spec->cpu_features |= CPU_FTR_HVMODE; mtspr(SPRN_HFSCR, 0); } mtspr(SPRN_FSCR, 0); /* * LPCR does not get cleared, to match behaviour with secondaries * in __restore_cpu_cpufeatures. Once the idle code is fixed, this * could clear LPCR too. */ } static int __init feat_try_enable_unknown(struct dt_cpu_feature *f) { if (f->hv_support == HV_SUPPORT_NONE) { } else if (f->hv_support & HV_SUPPORT_HFSCR) { u64 hfscr = mfspr(SPRN_HFSCR); hfscr |= 1UL << f->hfscr_bit_nr; mtspr(SPRN_HFSCR, hfscr); } else { /* Does not have a known recipe */ return 0; } if (f->os_support == OS_SUPPORT_NONE) { } else if (f->os_support & OS_SUPPORT_FSCR) { u64 fscr = mfspr(SPRN_FSCR); fscr |= 1UL << f->fscr_bit_nr; mtspr(SPRN_FSCR, fscr); } else { /* Does not have a known recipe */ return 0; } if ((f->usable_privilege & USABLE_PR) && (f->hwcap_bit_nr != -1)) { uint32_t word = f->hwcap_bit_nr / 32; uint32_t bit = f->hwcap_bit_nr % 32; if (word == 0) cur_cpu_spec->cpu_user_features |= 1U << bit; else if (word == 1) cur_cpu_spec->cpu_user_features2 |= 1U << bit; else pr_err("%s could not advertise to user (no hwcap bits)\n", f->name); } return 1; } static int __init feat_enable(struct dt_cpu_feature *f) { if (f->hv_support != HV_SUPPORT_NONE) { if (f->hfscr_bit_nr != -1) { u64 hfscr = mfspr(SPRN_HFSCR); hfscr |= 1UL << f->hfscr_bit_nr; mtspr(SPRN_HFSCR, hfscr); } } if (f->os_support != OS_SUPPORT_NONE) { if (f->fscr_bit_nr != -1) { u64 fscr = mfspr(SPRN_FSCR); fscr |= 1UL << f->fscr_bit_nr; mtspr(SPRN_FSCR, fscr); } } if ((f->usable_privilege & USABLE_PR) && (f->hwcap_bit_nr != -1)) { uint32_t word = f->hwcap_bit_nr / 32; uint32_t bit = f->hwcap_bit_nr % 32; if (word == 0) cur_cpu_spec->cpu_user_features |= 1U << bit; else if (word == 1) cur_cpu_spec->cpu_user_features2 |= 1U << bit; else pr_err("CPU feature: %s could not advertise to user (no hwcap bits)\n", f->name); } return 1; } static int __init feat_disable(struct dt_cpu_feature *f) { return 0; } static int __init feat_enable_hv(struct dt_cpu_feature *f) { u64 lpcr; if (!hv_mode) { pr_err("CPU feature hypervisor present in device tree but HV mode not enabled in the CPU. Ignoring.\n"); return 0; } mtspr(SPRN_LPID, 0); lpcr = mfspr(SPRN_LPCR); lpcr &= ~LPCR_LPES0; /* HV external interrupts */ mtspr(SPRN_LPCR, lpcr); cur_cpu_spec->cpu_features |= CPU_FTR_HVMODE; return 1; } static int __init feat_enable_le(struct dt_cpu_feature *f) { cur_cpu_spec->cpu_user_features |= PPC_FEATURE_TRUE_LE; return 1; } static int __init feat_enable_smt(struct dt_cpu_feature *f) { cur_cpu_spec->cpu_features |= CPU_FTR_SMT; cur_cpu_spec->cpu_user_features |= PPC_FEATURE_SMT; return 1; } static int __init feat_enable_idle_nap(struct dt_cpu_feature *f) { u64 lpcr; /* Set PECE wakeup modes for ISA 207 */ lpcr = mfspr(SPRN_LPCR); lpcr |= LPCR_PECE0; lpcr |= LPCR_PECE1; lpcr |= LPCR_PECE2; mtspr(SPRN_LPCR, lpcr); return 1; } static int __init feat_enable_align_dsisr(struct dt_cpu_feature *f) { cur_cpu_spec->cpu_features &= ~CPU_FTR_NODSISRALIGN; return 1; } static int __init feat_enable_idle_stop(struct dt_cpu_feature *f) { u64 lpcr; /* Set PECE wakeup modes for ISAv3.0B */ lpcr = mfspr(SPRN_LPCR); lpcr |= LPCR_PECE0; lpcr |= LPCR_PECE1; lpcr |= LPCR_PECE2; mtspr(SPRN_LPCR, lpcr); return 1; } static int __init feat_enable_mmu_hash(struct dt_cpu_feature *f) { u64 lpcr; lpcr = mfspr(SPRN_LPCR); lpcr &= ~LPCR_ISL; /* VRMASD */ lpcr |= LPCR_VPM0; lpcr &= ~LPCR_VPM1; lpcr |= 0x10UL << LPCR_VRMASD_SH; /* L=1 LP=00 */ mtspr(SPRN_LPCR, lpcr); cur_cpu_spec->mmu_features |= MMU_FTRS_HASH_BASE; cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_MMU; return 1; } static int __init feat_enable_mmu_hash_v3(struct dt_cpu_feature *f) { u64 lpcr; system_registers.lpcr_clear |= (LPCR_ISL | LPCR_UPRT | LPCR_HR); lpcr = mfspr(SPRN_LPCR); lpcr &= ~(LPCR_ISL | LPCR_UPRT | LPCR_HR); mtspr(SPRN_LPCR, lpcr); cur_cpu_spec->mmu_features |= MMU_FTRS_HASH_BASE; cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_MMU; return 1; } static int __init feat_enable_mmu_radix(struct dt_cpu_feature *f) { #ifdef CONFIG_PPC_RADIX_MMU cur_cpu_spec->mmu_features |= MMU_FTR_TYPE_RADIX; cur_cpu_spec->mmu_features |= MMU_FTRS_HASH_BASE; cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_MMU; return 1; #endif return 0; } static int __init feat_enable_dscr(struct dt_cpu_feature *f) { u64 lpcr; feat_enable(f); lpcr = mfspr(SPRN_LPCR); lpcr &= ~LPCR_DPFD; lpcr |= (4UL << LPCR_DPFD_SH); mtspr(SPRN_LPCR, lpcr); return 1; } static void hfscr_pmu_enable(void) { u64 hfscr = mfspr(SPRN_HFSCR); hfscr |= PPC_BIT(60); mtspr(SPRN_HFSCR, hfscr); } static void init_pmu_power8(void) { if (hv_mode) { mtspr(SPRN_MMCRC, 0); mtspr(SPRN_MMCRH, 0); } mtspr(SPRN_MMCRA, 0); mtspr(SPRN_MMCR0, 0); mtspr(SPRN_MMCR1, 0); mtspr(SPRN_MMCR2, 0); mtspr(SPRN_MMCRS, 0); } static int __init feat_enable_mce_power8(struct dt_cpu_feature *f) { cur_cpu_spec->platform = "power8"; cur_cpu_spec->machine_check_early = __machine_check_early_realmode_p8; return 1; } static int __init feat_enable_pmu_power8(struct dt_cpu_feature *f) { hfscr_pmu_enable(); init_pmu_power8(); init_pmu_registers = init_pmu_power8; cur_cpu_spec->cpu_features |= CPU_FTR_MMCRA; cur_cpu_spec->cpu_user_features |= PPC_FEATURE_PSERIES_PERFMON_COMPAT; if (pvr_version_is(PVR_POWER8E)) cur_cpu_spec->cpu_features |= CPU_FTR_PMAO_BUG; cur_cpu_spec->num_pmcs = 6; cur_cpu_spec->pmc_type = PPC_PMC_IBM; cur_cpu_spec->oprofile_cpu_type = "ppc64/power8"; return 1; } static void init_pmu_power9(void) { if (hv_mode) mtspr(SPRN_MMCRC, 0); mtspr(SPRN_MMCRA, 0); mtspr(SPRN_MMCR0, 0); mtspr(SPRN_MMCR1, 0); mtspr(SPRN_MMCR2, 0); } static int __init feat_enable_mce_power9(struct dt_cpu_feature *f) { cur_cpu_spec->platform = "power9"; cur_cpu_spec->machine_check_early = __machine_check_early_realmode_p9; return 1; } static int __init feat_enable_pmu_power9(struct dt_cpu_feature *f) { hfscr_pmu_enable(); init_pmu_power9(); init_pmu_registers = init_pmu_power9; 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/power9"; return 1; } static int __init feat_enable_tm(struct dt_cpu_feature *f) { #ifdef CONFIG_PPC_TRANSACTIONAL_MEM feat_enable(f); cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_HTM_NOSC; return 1; #endif return 0; } static int __init feat_enable_fp(struct dt_cpu_feature *f) { feat_enable(f); cur_cpu_spec->cpu_features &= ~CPU_FTR_FPU_UNAVAILABLE; return 1; } static int __init feat_enable_vector(struct dt_cpu_feature *f) { #ifdef CONFIG_ALTIVEC feat_enable(f); cur_cpu_spec->cpu_features |= CPU_FTR_ALTIVEC; cur_cpu_spec->cpu_features |= CPU_FTR_VMX_COPY; cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC; return 1; #endif return 0; } static int __init feat_enable_vsx(struct dt_cpu_feature *f) { #ifdef CONFIG_VSX feat_enable(f); cur_cpu_spec->cpu_features |= CPU_FTR_VSX; cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_VSX; return 1; #endif return 0; } static int __init feat_enable_purr(struct dt_cpu_feature *f) { cur_cpu_spec->cpu_features |= CPU_FTR_PURR | CPU_FTR_SPURR; return 1; } static int __init feat_enable_ebb(struct dt_cpu_feature *f) { /* * PPC_FEATURE2_EBB is enabled in PMU init code because it has * historically been related to the PMU facility. This may have * to be decoupled if EBB becomes more generic. For now, follow * existing convention. */ f->hwcap_bit_nr = -1; feat_enable(f); return 1; } static int __init feat_enable_dbell(struct dt_cpu_feature *f) { u64 lpcr; /* P9 has an HFSCR for privileged state */ feat_enable(f); cur_cpu_spec->cpu_features |= CPU_FTR_DBELL; lpcr = mfspr(SPRN_LPCR); lpcr |= LPCR_PECEDH; /* hyp doorbell wakeup */ mtspr(SPRN_LPCR, lpcr); return 1; } static int __init feat_enable_hvi(struct dt_cpu_feature *f) { u64 lpcr; /* * POWER9 XIVE interrupts including in OPAL XICS compatibility * are always delivered as hypervisor virtualization interrupts (HVI) * rather than EE. * * However LPES0 is not set here, in the chance that an EE does get * delivered to the host somehow, the EE handler would not expect it * to be delivered in LPES0 mode (e.g., using SRR[01]). This could * happen if there is a bug in interrupt controller code, or IC is * misconfigured in systemsim. */ lpcr = mfspr(SPRN_LPCR); lpcr |= LPCR_HVICE; /* enable hvi interrupts */ lpcr |= LPCR_HEIC; /* disable ee interrupts when MSR_HV */ lpcr |= LPCR_PECE_HVEE; /* hvi can wake from stop */ mtspr(SPRN_LPCR, lpcr); return 1; } static int __init feat_enable_large_ci(struct dt_cpu_feature *f) { cur_cpu_spec->mmu_features |= MMU_FTR_CI_LARGE_PAGE; return 1; } struct dt_cpu_feature_match { const char *name; int (*enable)(struct dt_cpu_feature *f); u64 cpu_ftr_bit_mask; }; static struct dt_cpu_feature_match __initdata dt_cpu_feature_match_table[] = { {"hypervisor", feat_enable_hv, 0}, {"big-endian", feat_enable, 0}, {"little-endian", feat_enable_le, CPU_FTR_REAL_LE}, {"smt", feat_enable_smt, 0}, {"interrupt-facilities", feat_enable, 0}, {"timer-facilities", feat_enable, 0}, {"timer-facilities-v3", feat_enable, 0}, {"debug-facilities", feat_enable, 0}, {"come-from-address-register", feat_enable, CPU_FTR_CFAR}, {"branch-tracing", feat_enable, 0}, {"floating-point", feat_enable_fp, 0}, {"vector", feat_enable_vector, 0}, {"vector-scalar", feat_enable_vsx, 0}, {"vector-scalar-v3", feat_enable, 0}, {"decimal-floating-point", feat_enable, 0}, {"decimal-integer", feat_enable, 0}, {"quadword-load-store", feat_enable, 0}, {"vector-crypto", feat_enable, 0}, {"mmu-hash", feat_enable_mmu_hash, 0}, {"mmu-radix", feat_enable_mmu_radix, 0}, {"mmu-hash-v3", feat_enable_mmu_hash_v3, 0}, {"virtual-page-class-key-protection", feat_enable, 0}, {"transactional-memory", feat_enable_tm, CPU_FTR_TM}, {"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}, {"alignment-interrupt-dsisr", feat_enable_align_dsisr, 0}, {"idle-stop", feat_enable_idle_stop, 0}, {"machine-check-power8", feat_enable_mce_power8, 0}, {"performance-monitor-power8", feat_enable_pmu_power8, 0}, {"data-stream-control-register", feat_enable_dscr, CPU_FTR_DSCR}, {"event-based-branch", feat_enable_ebb, 0}, {"target-address-register", feat_enable, 0}, {"branch-history-rolling-buffer", feat_enable, 0}, {"control-register", feat_enable, CPU_FTR_CTRL}, {"processor-control-facility", feat_enable_dbell, CPU_FTR_DBELL}, {"processor-control-facility-v3", feat_enable_dbell, CPU_FTR_DBELL}, {"processor-utilization-of-resources-register", feat_enable_purr, 0}, {"no-execute", feat_enable, 0}, {"strong-access-ordering", feat_enable, CPU_FTR_SAO}, {"cache-inhibited-large-page", feat_enable_large_ci, 0}, {"coprocessor-icswx", feat_enable, 0}, {"hypervisor-virtualization-interrupt", feat_enable_hvi, 0}, {"program-priority-register", feat_enable, CPU_FTR_HAS_PPR}, {"wait", feat_enable, 0}, {"atomic-memory-operations", feat_enable, 0}, {"branch-v3", feat_enable, 0}, {"copy-paste", feat_enable, 0}, {"decimal-floating-point-v3", feat_enable, 0}, {"decimal-integer-v3", feat_enable, 0}, {"fixed-point-v3", feat_enable, 0}, {"floating-point-v3", feat_enable, 0}, {"group-start-register", feat_enable, 0}, {"pc-relative-addressing", feat_enable, 0}, {"machine-check-power9", feat_enable_mce_power9, 0}, {"performance-monitor-power9", feat_enable_pmu_power9, 0}, {"event-based-branch-v3", feat_enable, 0}, {"random-number-generator", feat_enable, 0}, {"system-call-vectored", feat_disable, 0}, {"trace-interrupt-v3", feat_enable, 0}, {"vector-v3", feat_enable, 0}, {"vector-binary128", feat_enable, 0}, {"vector-binary16", feat_enable, 0}, {"wait-v3", feat_enable, 0}, }; static bool __initdata using_dt_cpu_ftrs; static bool __initdata enable_unknown = true; static int __init dt_cpu_ftrs_parse(char *str) { if (!str) return 0; if (!strcmp(str, "off")) using_dt_cpu_ftrs = false; else if (!strcmp(str, "known")) enable_unknown = false; else return 1; return 0; } early_param("dt_cpu_ftrs", dt_cpu_ftrs_parse); static void __init cpufeatures_setup_start(u32 isa) { pr_info("setup for ISA %d\n", isa); if (isa >= 3000) { cur_cpu_spec->cpu_features |= CPU_FTR_ARCH_300; cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_ARCH_3_00; } } static bool __init cpufeatures_process_feature(struct dt_cpu_feature *f) { const struct dt_cpu_feature_match *m; bool known = false; int i; for (i = 0; i < ARRAY_SIZE(dt_cpu_feature_match_table); i++) { m = &dt_cpu_feature_match_table[i]; if (!strcmp(f->name, m->name)) { known = true; if (m->enable(f)) { cur_cpu_spec->cpu_features |= m->cpu_ftr_bit_mask; break; } pr_info("not enabling: %s (disabled or unsupported by kernel)\n", f->name); return false; } } if (!known && (!enable_unknown || !feat_try_enable_unknown(f))) { pr_info("not enabling: %s (unknown and unsupported by kernel)\n", f->name); return false; } if (known) pr_debug("enabling: %s\n", f->name); else pr_debug("enabling: %s (unknown)\n", f->name); return true; } static __init void cpufeatures_cpu_quirks(void) { int version = mfspr(SPRN_PVR); /* * Not all quirks can be derived from the cpufeatures device tree. */ if ((version & 0xffffefff) == 0x004e0200) ; /* DD2.0 has no feature flag */ else if ((version & 0xffffefff) == 0x004e0201) 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; cur_cpu_spec->cpu_features |= CPU_FTR_P9_TM_XER_SO_BUG; cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1; } else if ((version & 0xffff0000) == 0x004e0000) /* DD2.1 and up have DD2_1 */ cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1; if ((version & 0xffff0000) == 0x004e0000) { cur_cpu_spec->cpu_features &= ~(CPU_FTR_DAWR); cur_cpu_spec->cpu_features |= CPU_FTR_P9_TLBIE_BUG; cur_cpu_spec->cpu_features |= CPU_FTR_P9_TIDR; } /* * PKEY was not in the initial base or feature node * specification, but it should become optional in the next * cpu feature version sequence. */ cur_cpu_spec->cpu_features |= CPU_FTR_PKEY; } static void __init cpufeatures_setup_finished(void) { cpufeatures_cpu_quirks(); if (hv_mode && !(cur_cpu_spec->cpu_features & CPU_FTR_HVMODE)) { pr_err("hypervisor not present in device tree but HV mode is enabled in the CPU. Enabling.\n"); cur_cpu_spec->cpu_features |= CPU_FTR_HVMODE; } /* Make sure powerpc_base_platform is non-NULL */ powerpc_base_platform = cur_cpu_spec->platform; system_registers.lpcr = mfspr(SPRN_LPCR); system_registers.hfscr = mfspr(SPRN_HFSCR); system_registers.fscr = mfspr(SPRN_FSCR); pr_info("final cpu/mmu features = 0x%016lx 0x%08x\n", cur_cpu_spec->cpu_features, cur_cpu_spec->mmu_features); } static int __init disabled_on_cmdline(void) { unsigned long root, chosen; const char *p; root = of_get_flat_dt_root(); chosen = of_get_flat_dt_subnode_by_name(root, "chosen"); if (chosen == -FDT_ERR_NOTFOUND) return false; p = of_get_flat_dt_prop(chosen, "bootargs", NULL); if (!p) return false; if (strstr(p, "dt_cpu_ftrs=off")) return true; return false; } static int __init fdt_find_cpu_features(unsigned long node, const char *uname, int depth, void *data) { if (of_flat_dt_is_compatible(node, "ibm,powerpc-cpu-features") && of_get_flat_dt_prop(node, "isa", NULL)) return 1; return 0; } bool __init dt_cpu_ftrs_in_use(void) { return using_dt_cpu_ftrs; } bool __init dt_cpu_ftrs_init(void *fdt) { using_dt_cpu_ftrs = false; /* Setup and verify the FDT, if it fails we just bail */ if (!early_init_dt_verify(fdt)) return false; if (!of_scan_flat_dt(fdt_find_cpu_features, NULL)) return false; if (disabled_on_cmdline()) return false; cpufeatures_setup_cpu(); using_dt_cpu_ftrs = true; return true; } static int nr_dt_cpu_features; static struct dt_cpu_feature *dt_cpu_features; static int __init process_cpufeatures_node(unsigned long node, const char *uname, int i) { const __be32 *prop; struct dt_cpu_feature *f; int len; f = &dt_cpu_features[i]; f->node = node; f->name = uname; prop = of_get_flat_dt_prop(node, "isa", &len); if (!prop) { pr_warn("%s: missing isa property\n", uname); return 0; } f->isa = be32_to_cpup(prop); prop = of_get_flat_dt_prop(node, "usable-privilege", &len); if (!prop) { pr_warn("%s: missing usable-privilege property", uname); return 0; } f->usable_privilege = be32_to_cpup(prop); prop = of_get_flat_dt_prop(node, "hv-support", &len); if (prop) f->hv_support = be32_to_cpup(prop); else f->hv_support = HV_SUPPORT_NONE; prop = of_get_flat_dt_prop(node, "os-support", &len); if (prop) f->os_support = be32_to_cpup(prop); else f->os_support = OS_SUPPORT_NONE; prop = of_get_flat_dt_prop(node, "hfscr-bit-nr", &len); if (prop) f->hfscr_bit_nr = be32_to_cpup(prop); else f->hfscr_bit_nr = -1; prop = of_get_flat_dt_prop(node, "fscr-bit-nr", &len); if (prop) f->fscr_bit_nr = be32_to_cpup(prop); else f->fscr_bit_nr = -1; prop = of_get_flat_dt_prop(node, "hwcap-bit-nr", &len); if (prop) f->hwcap_bit_nr = be32_to_cpup(prop); else f->hwcap_bit_nr = -1; if (f->usable_privilege & USABLE_HV) { if (!(mfmsr() & MSR_HV)) { pr_warn("%s: HV feature passed to guest\n", uname); return 0; } if (f->hv_support == HV_SUPPORT_NONE && f->hfscr_bit_nr != -1) { pr_warn("%s: unwanted hfscr_bit_nr\n", uname); return 0; } if (f->hv_support == HV_SUPPORT_HFSCR) { if (f->hfscr_bit_nr == -1) { pr_warn("%s: missing hfscr_bit_nr\n", uname); return 0; } } } else { if (f->hv_support != HV_SUPPORT_NONE || f->hfscr_bit_nr != -1) { pr_warn("%s: unwanted hv_support/hfscr_bit_nr\n", uname); return 0; } } if (f->usable_privilege & USABLE_OS) { if (f->os_support == OS_SUPPORT_NONE && f->fscr_bit_nr != -1) { pr_warn("%s: unwanted fscr_bit_nr\n", uname); return 0; } if (f->os_support == OS_SUPPORT_FSCR) { if (f->fscr_bit_nr == -1) { pr_warn("%s: missing fscr_bit_nr\n", uname); return 0; } } } else { if (f->os_support != OS_SUPPORT_NONE || f->fscr_bit_nr != -1) { pr_warn("%s: unwanted os_support/fscr_bit_nr\n", uname); return 0; } } if (!(f->usable_privilege & USABLE_PR)) { if (f->hwcap_bit_nr != -1) { pr_warn("%s: unwanted hwcap_bit_nr\n", uname); return 0; } } /* Do all the independent features in the first pass */ if (!of_get_flat_dt_prop(node, "dependencies", &len)) { if (cpufeatures_process_feature(f)) f->enabled = 1; else f->disabled = 1; } return 0; } static void __init cpufeatures_deps_enable(struct dt_cpu_feature *f) { const __be32 *prop; int len; int nr_deps; int i; if (f->enabled || f->disabled) return; prop = of_get_flat_dt_prop(f->node, "dependencies", &len); if (!prop) { pr_warn("%s: missing dependencies property", f->name); return; } nr_deps = len / sizeof(int); for (i = 0; i < nr_deps; i++) { unsigned long phandle = be32_to_cpu(prop[i]); int j; for (j = 0; j < nr_dt_cpu_features; j++) { struct dt_cpu_feature *d = &dt_cpu_features[j]; if (of_get_flat_dt_phandle(d->node) == phandle) { cpufeatures_deps_enable(d); if (d->disabled) { f->disabled = 1; return; } } } } if (cpufeatures_process_feature(f)) f->enabled = 1; else f->disabled = 1; } static int __init scan_cpufeatures_subnodes(unsigned long node, const char *uname, void *data) { int *count = data; process_cpufeatures_node(node, uname, *count); (*count)++; return 0; } static int __init count_cpufeatures_subnodes(unsigned long node, const char *uname, void *data) { int *count = data; (*count)++; return 0; } static int __init dt_cpu_ftrs_scan_callback(unsigned long node, const char *uname, int depth, void *data) { const __be32 *prop; int count, i; u32 isa; /* We are scanning "ibm,powerpc-cpu-features" nodes only */ if (!of_flat_dt_is_compatible(node, "ibm,powerpc-cpu-features")) return 0; prop = of_get_flat_dt_prop(node, "isa", NULL); if (!prop) /* We checked before, "can't happen" */ return 0; isa = be32_to_cpup(prop); /* Count and allocate space for cpu features */ of_scan_flat_dt_subnodes(node, count_cpufeatures_subnodes, &nr_dt_cpu_features); dt_cpu_features = memblock_alloc(sizeof(struct dt_cpu_feature) * nr_dt_cpu_features, PAGE_SIZE); if (!dt_cpu_features) panic("%s: Failed to allocate %zu bytes align=0x%lx\n", __func__, sizeof(struct dt_cpu_feature) * nr_dt_cpu_features, PAGE_SIZE); cpufeatures_setup_start(isa); /* Scan nodes into dt_cpu_features and enable those without deps */ count = 0; of_scan_flat_dt_subnodes(node, scan_cpufeatures_subnodes, &count); /* Recursive enable remaining features with dependencies */ for (i = 0; i < nr_dt_cpu_features; i++) { struct dt_cpu_feature *f = &dt_cpu_features[i]; cpufeatures_deps_enable(f); } prop = of_get_flat_dt_prop(node, "display-name", NULL); if (prop && strlen((char *)prop) != 0) { strlcpy(dt_cpu_name, (char *)prop, sizeof(dt_cpu_name)); cur_cpu_spec->cpu_name = dt_cpu_name; } cpufeatures_setup_finished(); memblock_free(__pa(dt_cpu_features), sizeof(struct dt_cpu_feature)*nr_dt_cpu_features); return 0; } void __init dt_cpu_ftrs_scan(void) { if (!using_dt_cpu_ftrs) return; of_scan_flat_dt(dt_cpu_ftrs_scan_callback, NULL); }