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Diffstat (limited to '')
| -rw-r--r-- | lib/extensions/amu/aarch64/amu.c | 655 |
1 files changed, 655 insertions, 0 deletions
diff --git a/lib/extensions/amu/aarch64/amu.c b/lib/extensions/amu/aarch64/amu.c new file mode 100644 index 0000000..72566fd --- /dev/null +++ b/lib/extensions/amu/aarch64/amu.c @@ -0,0 +1,655 @@ +/* + * Copyright (c) 2017-2021, ARM Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <assert.h> +#include <cdefs.h> +#include <inttypes.h> +#include <stdbool.h> +#include <stdint.h> + +#include "../amu_private.h" +#include <arch.h> +#include <arch_features.h> +#include <arch_helpers.h> +#include <common/debug.h> +#include <lib/el3_runtime/pubsub_events.h> +#include <lib/extensions/amu.h> + +#include <plat/common/platform.h> + +#if ENABLE_AMU_FCONF +# include <lib/fconf/fconf.h> +# include <lib/fconf/fconf_amu_getter.h> +#endif + +#if ENABLE_MPMM +# include <lib/mpmm/mpmm.h> +#endif + +struct amu_ctx { + uint64_t group0_cnts[AMU_GROUP0_MAX_COUNTERS]; +#if ENABLE_AMU_AUXILIARY_COUNTERS + uint64_t group1_cnts[AMU_GROUP1_MAX_COUNTERS]; +#endif + + /* Architected event counter 1 does not have an offset register */ + uint64_t group0_voffsets[AMU_GROUP0_MAX_COUNTERS - 1U]; +#if ENABLE_AMU_AUXILIARY_COUNTERS + uint64_t group1_voffsets[AMU_GROUP1_MAX_COUNTERS]; +#endif + + uint16_t group0_enable; +#if ENABLE_AMU_AUXILIARY_COUNTERS + uint16_t group1_enable; +#endif +}; + +static struct amu_ctx amu_ctxs_[PLATFORM_CORE_COUNT]; + +CASSERT((sizeof(amu_ctxs_[0].group0_enable) * CHAR_BIT) <= AMU_GROUP0_MAX_COUNTERS, + amu_ctx_group0_enable_cannot_represent_all_group0_counters); + +#if ENABLE_AMU_AUXILIARY_COUNTERS +CASSERT((sizeof(amu_ctxs_[0].group1_enable) * CHAR_BIT) <= AMU_GROUP1_MAX_COUNTERS, + amu_ctx_group1_enable_cannot_represent_all_group1_counters); +#endif + +static inline __unused uint64_t read_id_aa64pfr0_el1_amu(void) +{ + return (read_id_aa64pfr0_el1() >> ID_AA64PFR0_AMU_SHIFT) & + ID_AA64PFR0_AMU_MASK; +} + +static inline __unused uint64_t read_hcr_el2_amvoffen(void) +{ + return (read_hcr_el2() & HCR_AMVOFFEN_BIT) >> + HCR_AMVOFFEN_SHIFT; +} + +static inline __unused void write_cptr_el2_tam(uint64_t value) +{ + write_cptr_el2((read_cptr_el2() & ~CPTR_EL2_TAM_BIT) | + ((value << CPTR_EL2_TAM_SHIFT) & CPTR_EL2_TAM_BIT)); +} + +static inline __unused void ctx_write_cptr_el3_tam(cpu_context_t *ctx, uint64_t tam) +{ + uint64_t value = read_ctx_reg(get_el3state_ctx(ctx), CTX_CPTR_EL3); + + value &= ~TAM_BIT; + value |= (tam << TAM_SHIFT) & TAM_BIT; + + write_ctx_reg(get_el3state_ctx(ctx), CTX_CPTR_EL3, value); +} + +static inline __unused void ctx_write_scr_el3_amvoffen(cpu_context_t *ctx, uint64_t amvoffen) +{ + uint64_t value = read_ctx_reg(get_el3state_ctx(ctx), CTX_SCR_EL3); + + value &= ~SCR_AMVOFFEN_BIT; + value |= (amvoffen << SCR_AMVOFFEN_SHIFT) & SCR_AMVOFFEN_BIT; + + write_ctx_reg(get_el3state_ctx(ctx), CTX_SCR_EL3, value); +} + +static inline __unused void write_hcr_el2_amvoffen(uint64_t value) +{ + write_hcr_el2((read_hcr_el2() & ~HCR_AMVOFFEN_BIT) | + ((value << HCR_AMVOFFEN_SHIFT) & HCR_AMVOFFEN_BIT)); +} + +static inline __unused void write_amcr_el0_cg1rz(uint64_t value) +{ + write_amcr_el0((read_amcr_el0() & ~AMCR_CG1RZ_BIT) | + ((value << AMCR_CG1RZ_SHIFT) & AMCR_CG1RZ_BIT)); +} + +static inline __unused uint64_t read_amcfgr_el0_ncg(void) +{ + return (read_amcfgr_el0() >> AMCFGR_EL0_NCG_SHIFT) & + AMCFGR_EL0_NCG_MASK; +} + +static inline __unused uint64_t read_amcgcr_el0_cg0nc(void) +{ + return (read_amcgcr_el0() >> AMCGCR_EL0_CG0NC_SHIFT) & + AMCGCR_EL0_CG0NC_MASK; +} + +static inline __unused uint64_t read_amcg1idr_el0_voff(void) +{ + return (read_amcg1idr_el0() >> AMCG1IDR_VOFF_SHIFT) & + AMCG1IDR_VOFF_MASK; +} + +static inline __unused uint64_t read_amcgcr_el0_cg1nc(void) +{ + return (read_amcgcr_el0() >> AMCGCR_EL0_CG1NC_SHIFT) & + AMCGCR_EL0_CG1NC_MASK; +} + +static inline __unused uint64_t read_amcntenset0_el0_px(void) +{ + return (read_amcntenset0_el0() >> AMCNTENSET0_EL0_Pn_SHIFT) & + AMCNTENSET0_EL0_Pn_MASK; +} + +static inline __unused uint64_t read_amcntenset1_el0_px(void) +{ + return (read_amcntenset1_el0() >> AMCNTENSET1_EL0_Pn_SHIFT) & + AMCNTENSET1_EL0_Pn_MASK; +} + +static inline __unused void write_amcntenset0_el0_px(uint64_t px) +{ + uint64_t value = read_amcntenset0_el0(); + + value &= ~AMCNTENSET0_EL0_Pn_MASK; + value |= (px << AMCNTENSET0_EL0_Pn_SHIFT) & AMCNTENSET0_EL0_Pn_MASK; + + write_amcntenset0_el0(value); +} + +static inline __unused void write_amcntenset1_el0_px(uint64_t px) +{ + uint64_t value = read_amcntenset1_el0(); + + value &= ~AMCNTENSET1_EL0_Pn_MASK; + value |= (px << AMCNTENSET1_EL0_Pn_SHIFT) & AMCNTENSET1_EL0_Pn_MASK; + + write_amcntenset1_el0(value); +} + +static inline __unused void write_amcntenclr0_el0_px(uint64_t px) +{ + uint64_t value = read_amcntenclr0_el0(); + + value &= ~AMCNTENCLR0_EL0_Pn_MASK; + value |= (px << AMCNTENCLR0_EL0_Pn_SHIFT) & AMCNTENCLR0_EL0_Pn_MASK; + + write_amcntenclr0_el0(value); +} + +static inline __unused void write_amcntenclr1_el0_px(uint64_t px) +{ + uint64_t value = read_amcntenclr1_el0(); + + value &= ~AMCNTENCLR1_EL0_Pn_MASK; + value |= (px << AMCNTENCLR1_EL0_Pn_SHIFT) & AMCNTENCLR1_EL0_Pn_MASK; + + write_amcntenclr1_el0(value); +} + +static __unused bool amu_supported(void) +{ + return read_id_aa64pfr0_el1_amu() >= ID_AA64PFR0_AMU_V1; +} + +static __unused bool amu_v1p1_supported(void) +{ + return read_id_aa64pfr0_el1_amu() >= ID_AA64PFR0_AMU_V1P1; +} + +#if ENABLE_AMU_AUXILIARY_COUNTERS +static __unused bool amu_group1_supported(void) +{ + return read_amcfgr_el0_ncg() > 0U; +} +#endif + +/* + * Enable counters. This function is meant to be invoked by the context + * management library before exiting from EL3. + */ +void amu_enable(bool el2_unused, cpu_context_t *ctx) +{ + uint64_t id_aa64pfr0_el1_amu; /* AMU version */ + + uint64_t amcfgr_el0_ncg; /* Number of counter groups */ + uint64_t amcgcr_el0_cg0nc; /* Number of group 0 counters */ + + uint64_t amcntenset0_el0_px = 0x0; /* Group 0 enable mask */ + uint64_t amcntenset1_el0_px = 0x0; /* Group 1 enable mask */ + + id_aa64pfr0_el1_amu = read_id_aa64pfr0_el1_amu(); + if (id_aa64pfr0_el1_amu == ID_AA64PFR0_AMU_NOT_SUPPORTED) { + /* + * If the AMU is unsupported, nothing needs to be done. + */ + + return; + } + + if (el2_unused) { + /* + * CPTR_EL2.TAM: Set to zero so any accesses to the Activity + * Monitor registers do not trap to EL2. + */ + write_cptr_el2_tam(0U); + } + + /* + * Retrieve and update the CPTR_EL3 value from the context mentioned + * in 'ctx'. Set CPTR_EL3.TAM to zero so that any accesses to + * the Activity Monitor registers do not trap to EL3. + */ + ctx_write_cptr_el3_tam(ctx, 0U); + + /* + * Retrieve the number of architected counters. All of these counters + * are enabled by default. + */ + + amcgcr_el0_cg0nc = read_amcgcr_el0_cg0nc(); + amcntenset0_el0_px = (UINT64_C(1) << (amcgcr_el0_cg0nc)) - 1U; + + assert(amcgcr_el0_cg0nc <= AMU_AMCGCR_CG0NC_MAX); + + /* + * The platform may opt to enable specific auxiliary counters. This can + * be done via the common FCONF getter, or via the platform-implemented + * function. + */ + +#if ENABLE_AMU_AUXILIARY_COUNTERS + const struct amu_topology *topology; + +#if ENABLE_AMU_FCONF + topology = FCONF_GET_PROPERTY(amu, config, topology); +#else + topology = plat_amu_topology(); +#endif /* ENABLE_AMU_FCONF */ + + if (topology != NULL) { + unsigned int core_pos = plat_my_core_pos(); + + amcntenset1_el0_px = topology->cores[core_pos].enable; + } else { + ERROR("AMU: failed to generate AMU topology\n"); + } +#endif /* ENABLE_AMU_AUXILIARY_COUNTERS */ + + /* + * Enable the requested counters. + */ + + write_amcntenset0_el0_px(amcntenset0_el0_px); + + amcfgr_el0_ncg = read_amcfgr_el0_ncg(); + if (amcfgr_el0_ncg > 0U) { + write_amcntenset1_el0_px(amcntenset1_el0_px); + +#if !ENABLE_AMU_AUXILIARY_COUNTERS + VERBOSE("AMU: auxiliary counters detected but support is disabled\n"); +#endif + } + + /* Initialize FEAT_AMUv1p1 features if present. */ + if (id_aa64pfr0_el1_amu >= ID_AA64PFR0_AMU_V1P1) { + if (el2_unused) { + /* + * Make sure virtual offsets are disabled if EL2 not + * used. + */ + write_hcr_el2_amvoffen(0U); + } else { + /* + * Virtual offset registers are only accessible from EL3 + * and EL2, when clear, this bit traps accesses from EL2 + * so we set it to 1 when EL2 is present. + */ + ctx_write_scr_el3_amvoffen(ctx, 1U); + } + +#if AMU_RESTRICT_COUNTERS + /* + * FEAT_AMUv1p1 adds a register field to restrict access to + * group 1 counters at all but the highest implemented EL. This + * is controlled with the `AMU_RESTRICT_COUNTERS` compile time + * flag, when set, system register reads at lower ELs return + * zero. Reads from the memory mapped view are unaffected. + */ + VERBOSE("AMU group 1 counter access restricted.\n"); + write_amcr_el0_cg1rz(1U); +#else + write_amcr_el0_cg1rz(0U); +#endif + } + +#if ENABLE_MPMM + mpmm_enable(); +#endif +} + +/* Read the group 0 counter identified by the given `idx`. */ +static uint64_t amu_group0_cnt_read(unsigned int idx) +{ + assert(amu_supported()); + assert(idx < read_amcgcr_el0_cg0nc()); + + return amu_group0_cnt_read_internal(idx); +} + +/* Write the group 0 counter identified by the given `idx` with `val` */ +static void amu_group0_cnt_write(unsigned int idx, uint64_t val) +{ + assert(amu_supported()); + assert(idx < read_amcgcr_el0_cg0nc()); + + amu_group0_cnt_write_internal(idx, val); + isb(); +} + +/* + * Unlike with auxiliary counters, we cannot detect at runtime whether an + * architected counter supports a virtual offset. These are instead fixed + * according to FEAT_AMUv1p1, but this switch will need to be updated if later + * revisions of FEAT_AMU add additional architected counters. + */ +static bool amu_group0_voffset_supported(uint64_t idx) +{ + switch (idx) { + case 0U: + case 2U: + case 3U: + return true; + + case 1U: + return false; + + default: + ERROR("AMU: can't set up virtual offset for unknown " + "architected counter %" PRIu64 "!\n", idx); + + panic(); + } +} + +/* + * Read the group 0 offset register for a given index. Index must be 0, 2, + * or 3, the register for 1 does not exist. + * + * Using this function requires FEAT_AMUv1p1 support. + */ +static uint64_t amu_group0_voffset_read(unsigned int idx) +{ + assert(amu_v1p1_supported()); + assert(idx < read_amcgcr_el0_cg0nc()); + assert(idx != 1U); + + return amu_group0_voffset_read_internal(idx); +} + +/* + * Write the group 0 offset register for a given index. Index must be 0, 2, or + * 3, the register for 1 does not exist. + * + * Using this function requires FEAT_AMUv1p1 support. + */ +static void amu_group0_voffset_write(unsigned int idx, uint64_t val) +{ + assert(amu_v1p1_supported()); + assert(idx < read_amcgcr_el0_cg0nc()); + assert(idx != 1U); + + amu_group0_voffset_write_internal(idx, val); + isb(); +} + +#if ENABLE_AMU_AUXILIARY_COUNTERS +/* Read the group 1 counter identified by the given `idx` */ +static uint64_t amu_group1_cnt_read(unsigned int idx) +{ + assert(amu_supported()); + assert(amu_group1_supported()); + assert(idx < read_amcgcr_el0_cg1nc()); + + return amu_group1_cnt_read_internal(idx); +} + +/* Write the group 1 counter identified by the given `idx` with `val` */ +static void amu_group1_cnt_write(unsigned int idx, uint64_t val) +{ + assert(amu_supported()); + assert(amu_group1_supported()); + assert(idx < read_amcgcr_el0_cg1nc()); + + amu_group1_cnt_write_internal(idx, val); + isb(); +} + +/* + * Read the group 1 offset register for a given index. + * + * Using this function requires FEAT_AMUv1p1 support. + */ +static uint64_t amu_group1_voffset_read(unsigned int idx) +{ + assert(amu_v1p1_supported()); + assert(amu_group1_supported()); + assert(idx < read_amcgcr_el0_cg1nc()); + assert((read_amcg1idr_el0_voff() & (UINT64_C(1) << idx)) != 0U); + + return amu_group1_voffset_read_internal(idx); +} + +/* + * Write the group 1 offset register for a given index. + * + * Using this function requires FEAT_AMUv1p1 support. + */ +static void amu_group1_voffset_write(unsigned int idx, uint64_t val) +{ + assert(amu_v1p1_supported()); + assert(amu_group1_supported()); + assert(idx < read_amcgcr_el0_cg1nc()); + assert((read_amcg1idr_el0_voff() & (UINT64_C(1) << idx)) != 0U); + + amu_group1_voffset_write_internal(idx, val); + isb(); +} +#endif + +static void *amu_context_save(const void *arg) +{ + uint64_t i, j; + + unsigned int core_pos; + struct amu_ctx *ctx; + + uint64_t id_aa64pfr0_el1_amu; /* AMU version */ + uint64_t hcr_el2_amvoffen; /* AMU virtual offsets enabled */ + uint64_t amcgcr_el0_cg0nc; /* Number of group 0 counters */ + +#if ENABLE_AMU_AUXILIARY_COUNTERS + uint64_t amcg1idr_el0_voff; /* Auxiliary counters with virtual offsets */ + uint64_t amcfgr_el0_ncg; /* Number of counter groups */ + uint64_t amcgcr_el0_cg1nc; /* Number of group 1 counters */ +#endif + + id_aa64pfr0_el1_amu = read_id_aa64pfr0_el1_amu(); + if (id_aa64pfr0_el1_amu == ID_AA64PFR0_AMU_NOT_SUPPORTED) { + return (void *)0; + } + + core_pos = plat_my_core_pos(); + ctx = &amu_ctxs_[core_pos]; + + amcgcr_el0_cg0nc = read_amcgcr_el0_cg0nc(); + hcr_el2_amvoffen = (id_aa64pfr0_el1_amu >= ID_AA64PFR0_AMU_V1P1) ? + read_hcr_el2_amvoffen() : 0U; + +#if ENABLE_AMU_AUXILIARY_COUNTERS + amcfgr_el0_ncg = read_amcfgr_el0_ncg(); + amcgcr_el0_cg1nc = (amcfgr_el0_ncg > 0U) ? read_amcgcr_el0_cg1nc() : 0U; + amcg1idr_el0_voff = (hcr_el2_amvoffen != 0U) ? read_amcg1idr_el0_voff() : 0U; +#endif + + /* + * Disable all AMU counters. + */ + + ctx->group0_enable = read_amcntenset0_el0_px(); + write_amcntenclr0_el0_px(ctx->group0_enable); + +#if ENABLE_AMU_AUXILIARY_COUNTERS + if (amcfgr_el0_ncg > 0U) { + ctx->group1_enable = read_amcntenset1_el0_px(); + write_amcntenclr1_el0_px(ctx->group1_enable); + } +#endif + + /* + * Save the counters to the local context. + */ + + isb(); /* Ensure counters have been stopped */ + + for (i = 0U; i < amcgcr_el0_cg0nc; i++) { + ctx->group0_cnts[i] = amu_group0_cnt_read(i); + } + +#if ENABLE_AMU_AUXILIARY_COUNTERS + for (i = 0U; i < amcgcr_el0_cg1nc; i++) { + ctx->group1_cnts[i] = amu_group1_cnt_read(i); + } +#endif + + /* + * Save virtual offsets for counters that offer them. + */ + + if (hcr_el2_amvoffen != 0U) { + for (i = 0U, j = 0U; i < amcgcr_el0_cg0nc; i++) { + if (!amu_group0_voffset_supported(i)) { + continue; /* No virtual offset */ + } + + ctx->group0_voffsets[j++] = amu_group0_voffset_read(i); + } + +#if ENABLE_AMU_AUXILIARY_COUNTERS + for (i = 0U, j = 0U; i < amcgcr_el0_cg1nc; i++) { + if ((amcg1idr_el0_voff >> i) & 1U) { + continue; /* No virtual offset */ + } + + ctx->group1_voffsets[j++] = amu_group1_voffset_read(i); + } +#endif + } + + return (void *)0; +} + +static void *amu_context_restore(const void *arg) +{ + uint64_t i, j; + + unsigned int core_pos; + struct amu_ctx *ctx; + + uint64_t id_aa64pfr0_el1_amu; /* AMU version */ + + uint64_t hcr_el2_amvoffen; /* AMU virtual offsets enabled */ + + uint64_t amcfgr_el0_ncg; /* Number of counter groups */ + uint64_t amcgcr_el0_cg0nc; /* Number of group 0 counters */ + +#if ENABLE_AMU_AUXILIARY_COUNTERS + uint64_t amcgcr_el0_cg1nc; /* Number of group 1 counters */ + uint64_t amcg1idr_el0_voff; /* Auxiliary counters with virtual offsets */ +#endif + + id_aa64pfr0_el1_amu = read_id_aa64pfr0_el1_amu(); + if (id_aa64pfr0_el1_amu == ID_AA64PFR0_AMU_NOT_SUPPORTED) { + return (void *)0; + } + + core_pos = plat_my_core_pos(); + ctx = &amu_ctxs_[core_pos]; + + amcfgr_el0_ncg = read_amcfgr_el0_ncg(); + amcgcr_el0_cg0nc = read_amcgcr_el0_cg0nc(); + + hcr_el2_amvoffen = (id_aa64pfr0_el1_amu >= ID_AA64PFR0_AMU_V1P1) ? + read_hcr_el2_amvoffen() : 0U; + +#if ENABLE_AMU_AUXILIARY_COUNTERS + amcgcr_el0_cg1nc = (amcfgr_el0_ncg > 0U) ? read_amcgcr_el0_cg1nc() : 0U; + amcg1idr_el0_voff = (hcr_el2_amvoffen != 0U) ? read_amcg1idr_el0_voff() : 0U; +#endif + + /* + * Sanity check that all counters were disabled when the context was + * previously saved. + */ + + assert(read_amcntenset0_el0_px() == 0U); + + if (amcfgr_el0_ncg > 0U) { + assert(read_amcntenset1_el0_px() == 0U); + } + + /* + * Restore the counter values from the local context. + */ + + for (i = 0U; i < amcgcr_el0_cg0nc; i++) { + amu_group0_cnt_write(i, ctx->group0_cnts[i]); + } + +#if ENABLE_AMU_AUXILIARY_COUNTERS + for (i = 0U; i < amcgcr_el0_cg1nc; i++) { + amu_group1_cnt_write(i, ctx->group1_cnts[i]); + } +#endif + + /* + * Restore virtual offsets for counters that offer them. + */ + + if (hcr_el2_amvoffen != 0U) { + for (i = 0U, j = 0U; i < amcgcr_el0_cg0nc; i++) { + if (!amu_group0_voffset_supported(i)) { + continue; /* No virtual offset */ + } + + amu_group0_voffset_write(i, ctx->group0_voffsets[j++]); + } + +#if ENABLE_AMU_AUXILIARY_COUNTERS + for (i = 0U, j = 0U; i < amcgcr_el0_cg1nc; i++) { + if ((amcg1idr_el0_voff >> i) & 1U) { + continue; /* No virtual offset */ + } + + amu_group1_voffset_write(i, ctx->group1_voffsets[j++]); + } +#endif + } + + /* + * Re-enable counters that were disabled during context save. + */ + + write_amcntenset0_el0_px(ctx->group0_enable); + +#if ENABLE_AMU_AUXILIARY_COUNTERS + if (amcfgr_el0_ncg > 0) { + write_amcntenset1_el0_px(ctx->group1_enable); + } +#endif + +#if ENABLE_MPMM + mpmm_enable(); +#endif + + return (void *)0; +} + +SUBSCRIBE_TO_EVENT(psci_suspend_pwrdown_start, amu_context_save); +SUBSCRIBE_TO_EVENT(psci_suspend_pwrdown_finish, amu_context_restore); |