diff options
Diffstat (limited to 'arch/x86/events/amd/ibs.c')
| -rw-r--r-- | arch/x86/events/amd/ibs.c | 1544 |
1 files changed, 1544 insertions, 0 deletions
diff --git a/arch/x86/events/amd/ibs.c b/arch/x86/events/amd/ibs.c new file mode 100644 index 0000000000..6911c5399d --- /dev/null +++ b/arch/x86/events/amd/ibs.c @@ -0,0 +1,1544 @@ +/* + * Performance events - AMD IBS + * + * Copyright (C) 2011 Advanced Micro Devices, Inc., Robert Richter + * + * For licencing details see kernel-base/COPYING + */ + +#include <linux/perf_event.h> +#include <linux/init.h> +#include <linux/export.h> +#include <linux/pci.h> +#include <linux/ptrace.h> +#include <linux/syscore_ops.h> +#include <linux/sched/clock.h> + +#include <asm/apic.h> + +#include "../perf_event.h" + +static u32 ibs_caps; + +#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_AMD) + +#include <linux/kprobes.h> +#include <linux/hardirq.h> + +#include <asm/nmi.h> +#include <asm/amd-ibs.h> + +#define IBS_FETCH_CONFIG_MASK (IBS_FETCH_RAND_EN | IBS_FETCH_MAX_CNT) +#define IBS_OP_CONFIG_MASK IBS_OP_MAX_CNT + + +/* + * IBS states: + * + * ENABLED; tracks the pmu::add(), pmu::del() state, when set the counter is taken + * and any further add()s must fail. + * + * STARTED/STOPPING/STOPPED; deal with pmu::start(), pmu::stop() state but are + * complicated by the fact that the IBS hardware can send late NMIs (ie. after + * we've cleared the EN bit). + * + * In order to consume these late NMIs we have the STOPPED state, any NMI that + * happens after we've cleared the EN state will clear this bit and report the + * NMI handled (this is fundamentally racy in the face or multiple NMI sources, + * someone else can consume our BIT and our NMI will go unhandled). + * + * And since we cannot set/clear this separate bit together with the EN bit, + * there are races; if we cleared STARTED early, an NMI could land in + * between clearing STARTED and clearing the EN bit (in fact multiple NMIs + * could happen if the period is small enough), and consume our STOPPED bit + * and trigger streams of unhandled NMIs. + * + * If, however, we clear STARTED late, an NMI can hit between clearing the + * EN bit and clearing STARTED, still see STARTED set and process the event. + * If this event will have the VALID bit clear, we bail properly, but this + * is not a given. With VALID set we can end up calling pmu::stop() again + * (the throttle logic) and trigger the WARNs in there. + * + * So what we do is set STOPPING before clearing EN to avoid the pmu::stop() + * nesting, and clear STARTED late, so that we have a well defined state over + * the clearing of the EN bit. + * + * XXX: we could probably be using !atomic bitops for all this. + */ + +enum ibs_states { + IBS_ENABLED = 0, + IBS_STARTED = 1, + IBS_STOPPING = 2, + IBS_STOPPED = 3, + + IBS_MAX_STATES, +}; + +struct cpu_perf_ibs { + struct perf_event *event; + unsigned long state[BITS_TO_LONGS(IBS_MAX_STATES)]; +}; + +struct perf_ibs { + struct pmu pmu; + unsigned int msr; + u64 config_mask; + u64 cnt_mask; + u64 enable_mask; + u64 valid_mask; + u64 max_period; + unsigned long offset_mask[1]; + int offset_max; + unsigned int fetch_count_reset_broken : 1; + unsigned int fetch_ignore_if_zero_rip : 1; + struct cpu_perf_ibs __percpu *pcpu; + + u64 (*get_count)(u64 config); +}; + +static int +perf_event_set_period(struct hw_perf_event *hwc, u64 min, u64 max, u64 *hw_period) +{ + s64 left = local64_read(&hwc->period_left); + s64 period = hwc->sample_period; + int overflow = 0; + + /* + * If we are way outside a reasonable range then just skip forward: + */ + if (unlikely(left <= -period)) { + left = period; + local64_set(&hwc->period_left, left); + hwc->last_period = period; + overflow = 1; + } + + if (unlikely(left < (s64)min)) { + left += period; + local64_set(&hwc->period_left, left); + hwc->last_period = period; + overflow = 1; + } + + /* + * If the hw period that triggers the sw overflow is too short + * we might hit the irq handler. This biases the results. + * Thus we shorten the next-to-last period and set the last + * period to the max period. + */ + if (left > max) { + left -= max; + if (left > max) + left = max; + else if (left < min) + left = min; + } + + *hw_period = (u64)left; + + return overflow; +} + +static int +perf_event_try_update(struct perf_event *event, u64 new_raw_count, int width) +{ + struct hw_perf_event *hwc = &event->hw; + int shift = 64 - width; + u64 prev_raw_count; + u64 delta; + + /* + * Careful: an NMI might modify the previous event value. + * + * Our tactic to handle this is to first atomically read and + * exchange a new raw count - then add that new-prev delta + * count to the generic event atomically: + */ + prev_raw_count = local64_read(&hwc->prev_count); + if (!local64_try_cmpxchg(&hwc->prev_count, + &prev_raw_count, new_raw_count)) + return 0; + + /* + * Now we have the new raw value and have updated the prev + * timestamp already. We can now calculate the elapsed delta + * (event-)time and add that to the generic event. + * + * Careful, not all hw sign-extends above the physical width + * of the count. + */ + delta = (new_raw_count << shift) - (prev_raw_count << shift); + delta >>= shift; + + local64_add(delta, &event->count); + local64_sub(delta, &hwc->period_left); + + return 1; +} + +static struct perf_ibs perf_ibs_fetch; +static struct perf_ibs perf_ibs_op; + +static struct perf_ibs *get_ibs_pmu(int type) +{ + if (perf_ibs_fetch.pmu.type == type) + return &perf_ibs_fetch; + if (perf_ibs_op.pmu.type == type) + return &perf_ibs_op; + return NULL; +} + +/* + * core pmu config -> IBS config + * + * perf record -a -e cpu-cycles:p ... # use ibs op counting cycle count + * perf record -a -e r076:p ... # same as -e cpu-cycles:p + * perf record -a -e r0C1:p ... # use ibs op counting micro-ops + * + * IbsOpCntCtl (bit 19) of IBS Execution Control Register (IbsOpCtl, + * MSRC001_1033) is used to select either cycle or micro-ops counting + * mode. + */ +static int core_pmu_ibs_config(struct perf_event *event, u64 *config) +{ + switch (event->attr.type) { + case PERF_TYPE_HARDWARE: + switch (event->attr.config) { + case PERF_COUNT_HW_CPU_CYCLES: + *config = 0; + return 0; + } + break; + case PERF_TYPE_RAW: + switch (event->attr.config) { + case 0x0076: + *config = 0; + return 0; + case 0x00C1: + *config = IBS_OP_CNT_CTL; + return 0; + } + break; + default: + return -ENOENT; + } + + return -EOPNOTSUPP; +} + +/* + * The rip of IBS samples has skid 0. Thus, IBS supports precise + * levels 1 and 2 and the PERF_EFLAGS_EXACT is set. In rare cases the + * rip is invalid when IBS was not able to record the rip correctly. + * We clear PERF_EFLAGS_EXACT and take the rip from pt_regs then. + */ +int forward_event_to_ibs(struct perf_event *event) +{ + u64 config = 0; + + if (!event->attr.precise_ip || event->attr.precise_ip > 2) + return -EOPNOTSUPP; + + if (!core_pmu_ibs_config(event, &config)) { + event->attr.type = perf_ibs_op.pmu.type; + event->attr.config = config; + } + return -ENOENT; +} + +/* + * Grouping of IBS events is not possible since IBS can have only + * one event active at any point in time. + */ +static int validate_group(struct perf_event *event) +{ + struct perf_event *sibling; + + if (event->group_leader == event) + return 0; + + if (event->group_leader->pmu == event->pmu) + return -EINVAL; + + for_each_sibling_event(sibling, event->group_leader) { + if (sibling->pmu == event->pmu) + return -EINVAL; + } + return 0; +} + +static int perf_ibs_init(struct perf_event *event) +{ + struct hw_perf_event *hwc = &event->hw; + struct perf_ibs *perf_ibs; + u64 max_cnt, config; + int ret; + + perf_ibs = get_ibs_pmu(event->attr.type); + if (!perf_ibs) + return -ENOENT; + + config = event->attr.config; + + if (event->pmu != &perf_ibs->pmu) + return -ENOENT; + + if (config & ~perf_ibs->config_mask) + return -EINVAL; + + ret = validate_group(event); + if (ret) + return ret; + + if (hwc->sample_period) { + if (config & perf_ibs->cnt_mask) + /* raw max_cnt may not be set */ + return -EINVAL; + if (!event->attr.sample_freq && hwc->sample_period & 0x0f) + /* + * lower 4 bits can not be set in ibs max cnt, + * but allowing it in case we adjust the + * sample period to set a frequency. + */ + return -EINVAL; + hwc->sample_period &= ~0x0FULL; + if (!hwc->sample_period) + hwc->sample_period = 0x10; + } else { + max_cnt = config & perf_ibs->cnt_mask; + config &= ~perf_ibs->cnt_mask; + event->attr.sample_period = max_cnt << 4; + hwc->sample_period = event->attr.sample_period; + } + + if (!hwc->sample_period) + return -EINVAL; + + /* + * If we modify hwc->sample_period, we also need to update + * hwc->last_period and hwc->period_left. + */ + hwc->last_period = hwc->sample_period; + local64_set(&hwc->period_left, hwc->sample_period); + + hwc->config_base = perf_ibs->msr; + hwc->config = config; + + return 0; +} + +static int perf_ibs_set_period(struct perf_ibs *perf_ibs, + struct hw_perf_event *hwc, u64 *period) +{ + int overflow; + + /* ignore lower 4 bits in min count: */ + overflow = perf_event_set_period(hwc, 1<<4, perf_ibs->max_period, period); + local64_set(&hwc->prev_count, 0); + + return overflow; +} + +static u64 get_ibs_fetch_count(u64 config) +{ + union ibs_fetch_ctl fetch_ctl = (union ibs_fetch_ctl)config; + + return fetch_ctl.fetch_cnt << 4; +} + +static u64 get_ibs_op_count(u64 config) +{ + union ibs_op_ctl op_ctl = (union ibs_op_ctl)config; + u64 count = 0; + + /* + * If the internal 27-bit counter rolled over, the count is MaxCnt + * and the lower 7 bits of CurCnt are randomized. + * Otherwise CurCnt has the full 27-bit current counter value. + */ + if (op_ctl.op_val) { + count = op_ctl.opmaxcnt << 4; + if (ibs_caps & IBS_CAPS_OPCNTEXT) + count += op_ctl.opmaxcnt_ext << 20; + } else if (ibs_caps & IBS_CAPS_RDWROPCNT) { + count = op_ctl.opcurcnt; + } + + return count; +} + +static void +perf_ibs_event_update(struct perf_ibs *perf_ibs, struct perf_event *event, + u64 *config) +{ + u64 count = perf_ibs->get_count(*config); + + /* + * Set width to 64 since we do not overflow on max width but + * instead on max count. In perf_ibs_set_period() we clear + * prev count manually on overflow. + */ + while (!perf_event_try_update(event, count, 64)) { + rdmsrl(event->hw.config_base, *config); + count = perf_ibs->get_count(*config); + } +} + +static inline void perf_ibs_enable_event(struct perf_ibs *perf_ibs, + struct hw_perf_event *hwc, u64 config) +{ + u64 tmp = hwc->config | config; + + if (perf_ibs->fetch_count_reset_broken) + wrmsrl(hwc->config_base, tmp & ~perf_ibs->enable_mask); + + wrmsrl(hwc->config_base, tmp | perf_ibs->enable_mask); +} + +/* + * Erratum #420 Instruction-Based Sampling Engine May Generate + * Interrupt that Cannot Be Cleared: + * + * Must clear counter mask first, then clear the enable bit. See + * Revision Guide for AMD Family 10h Processors, Publication #41322. + */ +static inline void perf_ibs_disable_event(struct perf_ibs *perf_ibs, + struct hw_perf_event *hwc, u64 config) +{ + config &= ~perf_ibs->cnt_mask; + if (boot_cpu_data.x86 == 0x10) + wrmsrl(hwc->config_base, config); + config &= ~perf_ibs->enable_mask; + wrmsrl(hwc->config_base, config); +} + +/* + * We cannot restore the ibs pmu state, so we always needs to update + * the event while stopping it and then reset the state when starting + * again. Thus, ignoring PERF_EF_RELOAD and PERF_EF_UPDATE flags in + * perf_ibs_start()/perf_ibs_stop() and instead always do it. + */ +static void perf_ibs_start(struct perf_event *event, int flags) +{ + struct hw_perf_event *hwc = &event->hw; + struct perf_ibs *perf_ibs = container_of(event->pmu, struct perf_ibs, pmu); + struct cpu_perf_ibs *pcpu = this_cpu_ptr(perf_ibs->pcpu); + u64 period, config = 0; + + if (WARN_ON_ONCE(!(hwc->state & PERF_HES_STOPPED))) + return; + + WARN_ON_ONCE(!(hwc->state & PERF_HES_UPTODATE)); + hwc->state = 0; + + perf_ibs_set_period(perf_ibs, hwc, &period); + if (perf_ibs == &perf_ibs_op && (ibs_caps & IBS_CAPS_OPCNTEXT)) { + config |= period & IBS_OP_MAX_CNT_EXT_MASK; + period &= ~IBS_OP_MAX_CNT_EXT_MASK; + } + config |= period >> 4; + + /* + * Set STARTED before enabling the hardware, such that a subsequent NMI + * must observe it. + */ + set_bit(IBS_STARTED, pcpu->state); + clear_bit(IBS_STOPPING, pcpu->state); + perf_ibs_enable_event(perf_ibs, hwc, config); + + perf_event_update_userpage(event); +} + +static void perf_ibs_stop(struct perf_event *event, int flags) +{ + struct hw_perf_event *hwc = &event->hw; + struct perf_ibs *perf_ibs = container_of(event->pmu, struct perf_ibs, pmu); + struct cpu_perf_ibs *pcpu = this_cpu_ptr(perf_ibs->pcpu); + u64 config; + int stopping; + + if (test_and_set_bit(IBS_STOPPING, pcpu->state)) + return; + + stopping = test_bit(IBS_STARTED, pcpu->state); + + if (!stopping && (hwc->state & PERF_HES_UPTODATE)) + return; + + rdmsrl(hwc->config_base, config); + + if (stopping) { + /* + * Set STOPPED before disabling the hardware, such that it + * must be visible to NMIs the moment we clear the EN bit, + * at which point we can generate an !VALID sample which + * we need to consume. + */ + set_bit(IBS_STOPPED, pcpu->state); + perf_ibs_disable_event(perf_ibs, hwc, config); + /* + * Clear STARTED after disabling the hardware; if it were + * cleared before an NMI hitting after the clear but before + * clearing the EN bit might think it a spurious NMI and not + * handle it. + * + * Clearing it after, however, creates the problem of the NMI + * handler seeing STARTED but not having a valid sample. + */ + clear_bit(IBS_STARTED, pcpu->state); + WARN_ON_ONCE(hwc->state & PERF_HES_STOPPED); + hwc->state |= PERF_HES_STOPPED; + } + + if (hwc->state & PERF_HES_UPTODATE) + return; + + /* + * Clear valid bit to not count rollovers on update, rollovers + * are only updated in the irq handler. + */ + config &= ~perf_ibs->valid_mask; + + perf_ibs_event_update(perf_ibs, event, &config); + hwc->state |= PERF_HES_UPTODATE; +} + +static int perf_ibs_add(struct perf_event *event, int flags) +{ + struct perf_ibs *perf_ibs = container_of(event->pmu, struct perf_ibs, pmu); + struct cpu_perf_ibs *pcpu = this_cpu_ptr(perf_ibs->pcpu); + + if (test_and_set_bit(IBS_ENABLED, pcpu->state)) + return -ENOSPC; + + event->hw.state = PERF_HES_UPTODATE | PERF_HES_STOPPED; + + pcpu->event = event; + + if (flags & PERF_EF_START) + perf_ibs_start(event, PERF_EF_RELOAD); + + return 0; +} + +static void perf_ibs_del(struct perf_event *event, int flags) +{ + struct perf_ibs *perf_ibs = container_of(event->pmu, struct perf_ibs, pmu); + struct cpu_perf_ibs *pcpu = this_cpu_ptr(perf_ibs->pcpu); + + if (!test_and_clear_bit(IBS_ENABLED, pcpu->state)) + return; + + perf_ibs_stop(event, PERF_EF_UPDATE); + + pcpu->event = NULL; + + perf_event_update_userpage(event); +} + +static void perf_ibs_read(struct perf_event *event) { } + +/* + * We need to initialize with empty group if all attributes in the + * group are dynamic. + */ +static struct attribute *attrs_empty[] = { + NULL, +}; + +static struct attribute_group empty_format_group = { + .name = "format", + .attrs = attrs_empty, +}; + +static struct attribute_group empty_caps_group = { + .name = "caps", + .attrs = attrs_empty, +}; + +static const struct attribute_group *empty_attr_groups[] = { + &empty_format_group, + &empty_caps_group, + NULL, +}; + +PMU_FORMAT_ATTR(rand_en, "config:57"); +PMU_FORMAT_ATTR(cnt_ctl, "config:19"); +PMU_EVENT_ATTR_STRING(l3missonly, fetch_l3missonly, "config:59"); +PMU_EVENT_ATTR_STRING(l3missonly, op_l3missonly, "config:16"); +PMU_EVENT_ATTR_STRING(zen4_ibs_extensions, zen4_ibs_extensions, "1"); + +static umode_t +zen4_ibs_extensions_is_visible(struct kobject *kobj, struct attribute *attr, int i) +{ + return ibs_caps & IBS_CAPS_ZEN4 ? attr->mode : 0; +} + +static struct attribute *rand_en_attrs[] = { + &format_attr_rand_en.attr, + NULL, +}; + +static struct attribute *fetch_l3missonly_attrs[] = { + &fetch_l3missonly.attr.attr, + NULL, +}; + +static struct attribute *zen4_ibs_extensions_attrs[] = { + &zen4_ibs_extensions.attr.attr, + NULL, +}; + +static struct attribute_group group_rand_en = { + .name = "format", + .attrs = rand_en_attrs, +}; + +static struct attribute_group group_fetch_l3missonly = { + .name = "format", + .attrs = fetch_l3missonly_attrs, + .is_visible = zen4_ibs_extensions_is_visible, +}; + +static struct attribute_group group_zen4_ibs_extensions = { + .name = "caps", + .attrs = zen4_ibs_extensions_attrs, + .is_visible = zen4_ibs_extensions_is_visible, +}; + +static const struct attribute_group *fetch_attr_groups[] = { + &group_rand_en, + &empty_caps_group, + NULL, +}; + +static const struct attribute_group *fetch_attr_update[] = { + &group_fetch_l3missonly, + &group_zen4_ibs_extensions, + NULL, +}; + +static umode_t +cnt_ctl_is_visible(struct kobject *kobj, struct attribute *attr, int i) +{ + return ibs_caps & IBS_CAPS_OPCNT ? attr->mode : 0; +} + +static struct attribute *cnt_ctl_attrs[] = { + &format_attr_cnt_ctl.attr, + NULL, +}; + +static struct attribute *op_l3missonly_attrs[] = { + &op_l3missonly.attr.attr, + NULL, +}; + +static struct attribute_group group_cnt_ctl = { + .name = "format", + .attrs = cnt_ctl_attrs, + .is_visible = cnt_ctl_is_visible, +}; + +static struct attribute_group group_op_l3missonly = { + .name = "format", + .attrs = op_l3missonly_attrs, + .is_visible = zen4_ibs_extensions_is_visible, +}; + +static const struct attribute_group *op_attr_update[] = { + &group_cnt_ctl, + &group_op_l3missonly, + &group_zen4_ibs_extensions, + NULL, +}; + +static struct perf_ibs perf_ibs_fetch = { + .pmu = { + .task_ctx_nr = perf_hw_context, + + .event_init = perf_ibs_init, + .add = perf_ibs_add, + .del = perf_ibs_del, + .start = perf_ibs_start, + .stop = perf_ibs_stop, + .read = perf_ibs_read, + .capabilities = PERF_PMU_CAP_NO_EXCLUDE, + }, + .msr = MSR_AMD64_IBSFETCHCTL, + .config_mask = IBS_FETCH_CONFIG_MASK, + .cnt_mask = IBS_FETCH_MAX_CNT, + .enable_mask = IBS_FETCH_ENABLE, + .valid_mask = IBS_FETCH_VAL, + .max_period = IBS_FETCH_MAX_CNT << 4, + .offset_mask = { MSR_AMD64_IBSFETCH_REG_MASK }, + .offset_max = MSR_AMD64_IBSFETCH_REG_COUNT, + + .get_count = get_ibs_fetch_count, +}; + +static struct perf_ibs perf_ibs_op = { + .pmu = { + .task_ctx_nr = perf_hw_context, + + .event_init = perf_ibs_init, + .add = perf_ibs_add, + .del = perf_ibs_del, + .start = perf_ibs_start, + .stop = perf_ibs_stop, + .read = perf_ibs_read, + .capabilities = PERF_PMU_CAP_NO_EXCLUDE, + }, + .msr = MSR_AMD64_IBSOPCTL, + .config_mask = IBS_OP_CONFIG_MASK, + .cnt_mask = IBS_OP_MAX_CNT | IBS_OP_CUR_CNT | + IBS_OP_CUR_CNT_RAND, + .enable_mask = IBS_OP_ENABLE, + .valid_mask = IBS_OP_VAL, + .max_period = IBS_OP_MAX_CNT << 4, + .offset_mask = { MSR_AMD64_IBSOP_REG_MASK }, + .offset_max = MSR_AMD64_IBSOP_REG_COUNT, + + .get_count = get_ibs_op_count, +}; + +static void perf_ibs_get_mem_op(union ibs_op_data3 *op_data3, + struct perf_sample_data *data) +{ + union perf_mem_data_src *data_src = &data->data_src; + + data_src->mem_op = PERF_MEM_OP_NA; + + if (op_data3->ld_op) + data_src->mem_op = PERF_MEM_OP_LOAD; + else if (op_data3->st_op) + data_src->mem_op = PERF_MEM_OP_STORE; +} + +/* + * Processors having CPUID_Fn8000001B_EAX[11] aka IBS_CAPS_ZEN4 has + * more fine granular DataSrc encodings. Others have coarse. + */ +static u8 perf_ibs_data_src(union ibs_op_data2 *op_data2) +{ + if (ibs_caps & IBS_CAPS_ZEN4) + return (op_data2->data_src_hi << 3) | op_data2->data_src_lo; + + return op_data2->data_src_lo; +} + +#define L(x) (PERF_MEM_S(LVL, x) | PERF_MEM_S(LVL, HIT)) +#define LN(x) PERF_MEM_S(LVLNUM, x) +#define REM PERF_MEM_S(REMOTE, REMOTE) +#define HOPS(x) PERF_MEM_S(HOPS, x) + +static u64 g_data_src[8] = { + [IBS_DATA_SRC_LOC_CACHE] = L(L3) | L(REM_CCE1) | LN(ANY_CACHE) | HOPS(0), + [IBS_DATA_SRC_DRAM] = L(LOC_RAM) | LN(RAM), + [IBS_DATA_SRC_REM_CACHE] = L(REM_CCE2) | LN(ANY_CACHE) | REM | HOPS(1), + [IBS_DATA_SRC_IO] = L(IO) | LN(IO), +}; + +#define RMT_NODE_BITS (1 << IBS_DATA_SRC_DRAM) +#define RMT_NODE_APPLICABLE(x) (RMT_NODE_BITS & (1 << x)) + +static u64 g_zen4_data_src[32] = { + [IBS_DATA_SRC_EXT_LOC_CACHE] = L(L3) | LN(L3), + [IBS_DATA_SRC_EXT_NEAR_CCX_CACHE] = L(REM_CCE1) | LN(ANY_CACHE) | REM | HOPS(0), + [IBS_DATA_SRC_EXT_DRAM] = L(LOC_RAM) | LN(RAM), + [IBS_DATA_SRC_EXT_FAR_CCX_CACHE] = L(REM_CCE2) | LN(ANY_CACHE) | REM | HOPS(1), + [IBS_DATA_SRC_EXT_PMEM] = LN(PMEM), + [IBS_DATA_SRC_EXT_IO] = L(IO) | LN(IO), + [IBS_DATA_SRC_EXT_EXT_MEM] = LN(CXL), +}; + +#define ZEN4_RMT_NODE_BITS ((1 << IBS_DATA_SRC_EXT_DRAM) | \ + (1 << IBS_DATA_SRC_EXT_PMEM) | \ + (1 << IBS_DATA_SRC_EXT_EXT_MEM)) +#define ZEN4_RMT_NODE_APPLICABLE(x) (ZEN4_RMT_NODE_BITS & (1 << x)) + +static __u64 perf_ibs_get_mem_lvl(union ibs_op_data2 *op_data2, + union ibs_op_data3 *op_data3, + struct perf_sample_data *data) +{ + union perf_mem_data_src *data_src = &data->data_src; + u8 ibs_data_src = perf_ibs_data_src(op_data2); + + data_src->mem_lvl = 0; + data_src->mem_lvl_num = 0; + + /* + * DcMiss, L2Miss, DataSrc, DcMissLat etc. are all invalid for Uncached + * memory accesses. So, check DcUcMemAcc bit early. + */ + if (op_data3->dc_uc_mem_acc && ibs_data_src != IBS_DATA_SRC_EXT_IO) + return L(UNC) | LN(UNC); + + /* L1 Hit */ + if (op_data3->dc_miss == 0) + return L(L1) | LN(L1); + + /* L2 Hit */ + if (op_data3->l2_miss == 0) { + /* Erratum #1293 */ + if (boot_cpu_data.x86 != 0x19 || boot_cpu_data.x86_model > 0xF || + !(op_data3->sw_pf || op_data3->dc_miss_no_mab_alloc)) + return L(L2) | LN(L2); + } + + /* + * OP_DATA2 is valid only for load ops. Skip all checks which + * uses OP_DATA2[DataSrc]. + */ + if (data_src->mem_op != PERF_MEM_OP_LOAD) + goto check_mab; + + if (ibs_caps & IBS_CAPS_ZEN4) { + u64 val = g_zen4_data_src[ibs_data_src]; + + if (!val) + goto check_mab; + + /* HOPS_1 because IBS doesn't provide remote socket detail */ + if (op_data2->rmt_node && ZEN4_RMT_NODE_APPLICABLE(ibs_data_src)) { + if (ibs_data_src == IBS_DATA_SRC_EXT_DRAM) + val = L(REM_RAM1) | LN(RAM) | REM | HOPS(1); + else + val |= REM | HOPS(1); + } + + return val; + } else { + u64 val = g_data_src[ibs_data_src]; + + if (!val) + goto check_mab; + + /* HOPS_1 because IBS doesn't provide remote socket detail */ + if (op_data2->rmt_node && RMT_NODE_APPLICABLE(ibs_data_src)) { + if (ibs_data_src == IBS_DATA_SRC_DRAM) + val = L(REM_RAM1) | LN(RAM) | REM | HOPS(1); + else + val |= REM | HOPS(1); + } + + return val; + } + +check_mab: + /* + * MAB (Miss Address Buffer) Hit. MAB keeps track of outstanding + * DC misses. However, such data may come from any level in mem + * hierarchy. IBS provides detail about both MAB as well as actual + * DataSrc simultaneously. Prioritize DataSrc over MAB, i.e. set + * MAB only when IBS fails to provide DataSrc. + */ + if (op_data3->dc_miss_no_mab_alloc) + return L(LFB) | LN(LFB); + + /* Don't set HIT with NA */ + return PERF_MEM_S(LVL, NA) | LN(NA); +} + +static bool perf_ibs_cache_hit_st_valid(void) +{ + /* 0: Uninitialized, 1: Valid, -1: Invalid */ + static int cache_hit_st_valid; + + if (unlikely(!cache_hit_st_valid)) { + if (boot_cpu_data.x86 == 0x19 && + (boot_cpu_data.x86_model <= 0xF || + (boot_cpu_data.x86_model >= 0x20 && + boot_cpu_data.x86_model <= 0x5F))) { + cache_hit_st_valid = -1; + } else { + cache_hit_st_valid = 1; + } + } + + return cache_hit_st_valid == 1; +} + +static void perf_ibs_get_mem_snoop(union ibs_op_data2 *op_data2, + struct perf_sample_data *data) +{ + union perf_mem_data_src *data_src = &data->data_src; + u8 ibs_data_src; + + data_src->mem_snoop = PERF_MEM_SNOOP_NA; + + if (!perf_ibs_cache_hit_st_valid() || + data_src->mem_op != PERF_MEM_OP_LOAD || + data_src->mem_lvl & PERF_MEM_LVL_L1 || + data_src->mem_lvl & PERF_MEM_LVL_L2 || + op_data2->cache_hit_st) + return; + + ibs_data_src = perf_ibs_data_src(op_data2); + + if (ibs_caps & IBS_CAPS_ZEN4) { + if (ibs_data_src == IBS_DATA_SRC_EXT_LOC_CACHE || + ibs_data_src == IBS_DATA_SRC_EXT_NEAR_CCX_CACHE || + ibs_data_src == IBS_DATA_SRC_EXT_FAR_CCX_CACHE) + data_src->mem_snoop = PERF_MEM_SNOOP_HITM; + } else if (ibs_data_src == IBS_DATA_SRC_LOC_CACHE) { + data_src->mem_snoop = PERF_MEM_SNOOP_HITM; + } +} + +static void perf_ibs_get_tlb_lvl(union ibs_op_data3 *op_data3, + struct perf_sample_data *data) +{ + union perf_mem_data_src *data_src = &data->data_src; + + data_src->mem_dtlb = PERF_MEM_TLB_NA; + + if (!op_data3->dc_lin_addr_valid) + return; + + if (!op_data3->dc_l1tlb_miss) { + data_src->mem_dtlb = PERF_MEM_TLB_L1 | PERF_MEM_TLB_HIT; + return; + } + + if (!op_data3->dc_l2tlb_miss) { + data_src->mem_dtlb = PERF_MEM_TLB_L2 | PERF_MEM_TLB_HIT; + return; + } + + data_src->mem_dtlb = PERF_MEM_TLB_L2 | PERF_MEM_TLB_MISS; +} + +static void perf_ibs_get_mem_lock(union ibs_op_data3 *op_data3, + struct perf_sample_data *data) +{ + union perf_mem_data_src *data_src = &data->data_src; + + data_src->mem_lock = PERF_MEM_LOCK_NA; + + if (op_data3->dc_locked_op) + data_src->mem_lock = PERF_MEM_LOCK_LOCKED; +} + +#define ibs_op_msr_idx(msr) (msr - MSR_AMD64_IBSOPCTL) + +static void perf_ibs_get_data_src(struct perf_ibs_data *ibs_data, + struct perf_sample_data *data, + union ibs_op_data2 *op_data2, + union ibs_op_data3 *op_data3) +{ + union perf_mem_data_src *data_src = &data->data_src; + + data_src->val |= perf_ibs_get_mem_lvl(op_data2, op_data3, data); + perf_ibs_get_mem_snoop(op_data2, data); + perf_ibs_get_tlb_lvl(op_data3, data); + perf_ibs_get_mem_lock(op_data3, data); +} + +static __u64 perf_ibs_get_op_data2(struct perf_ibs_data *ibs_data, + union ibs_op_data3 *op_data3) +{ + __u64 val = ibs_data->regs[ibs_op_msr_idx(MSR_AMD64_IBSOPDATA2)]; + + /* Erratum #1293 */ + if (boot_cpu_data.x86 == 0x19 && boot_cpu_data.x86_model <= 0xF && + (op_data3->sw_pf || op_data3->dc_miss_no_mab_alloc)) { + /* + * OP_DATA2 has only two fields on Zen3: DataSrc and RmtNode. + * DataSrc=0 is 'No valid status' and RmtNode is invalid when + * DataSrc=0. + */ + val = 0; + } + return val; +} + +static void perf_ibs_parse_ld_st_data(__u64 sample_type, + struct perf_ibs_data *ibs_data, + struct perf_sample_data *data) +{ + union ibs_op_data3 op_data3; + union ibs_op_data2 op_data2; + union ibs_op_data op_data; + + data->data_src.val = PERF_MEM_NA; + op_data3.val = ibs_data->regs[ibs_op_msr_idx(MSR_AMD64_IBSOPDATA3)]; + + perf_ibs_get_mem_op(&op_data3, data); + if (data->data_src.mem_op != PERF_MEM_OP_LOAD && + data->data_src.mem_op != PERF_MEM_OP_STORE) + return; + + op_data2.val = perf_ibs_get_op_data2(ibs_data, &op_data3); + + if (sample_type & PERF_SAMPLE_DATA_SRC) { + perf_ibs_get_data_src(ibs_data, data, &op_data2, &op_data3); + data->sample_flags |= PERF_SAMPLE_DATA_SRC; + } + + if (sample_type & PERF_SAMPLE_WEIGHT_TYPE && op_data3.dc_miss && + data->data_src.mem_op == PERF_MEM_OP_LOAD) { + op_data.val = ibs_data->regs[ibs_op_msr_idx(MSR_AMD64_IBSOPDATA)]; + + if (sample_type & PERF_SAMPLE_WEIGHT_STRUCT) { + data->weight.var1_dw = op_data3.dc_miss_lat; + data->weight.var2_w = op_data.tag_to_ret_ctr; + } else if (sample_type & PERF_SAMPLE_WEIGHT) { + data->weight.full = op_data3.dc_miss_lat; + } + data->sample_flags |= PERF_SAMPLE_WEIGHT_TYPE; + } + + if (sample_type & PERF_SAMPLE_ADDR && op_data3.dc_lin_addr_valid) { + data->addr = ibs_data->regs[ibs_op_msr_idx(MSR_AMD64_IBSDCLINAD)]; + data->sample_flags |= PERF_SAMPLE_ADDR; + } + + if (sample_type & PERF_SAMPLE_PHYS_ADDR && op_data3.dc_phy_addr_valid) { + data->phys_addr = ibs_data->regs[ibs_op_msr_idx(MSR_AMD64_IBSDCPHYSAD)]; + data->sample_flags |= PERF_SAMPLE_PHYS_ADDR; + } +} + +static int perf_ibs_get_offset_max(struct perf_ibs *perf_ibs, u64 sample_type, + int check_rip) +{ + if (sample_type & PERF_SAMPLE_RAW || + (perf_ibs == &perf_ibs_op && + (sample_type & PERF_SAMPLE_DATA_SRC || + sample_type & PERF_SAMPLE_WEIGHT_TYPE || + sample_type & PERF_SAMPLE_ADDR || + sample_type & PERF_SAMPLE_PHYS_ADDR))) + return perf_ibs->offset_max; + else if (check_rip) + return 3; + return 1; +} + +static int perf_ibs_handle_irq(struct perf_ibs *perf_ibs, struct pt_regs *iregs) +{ + struct cpu_perf_ibs *pcpu = this_cpu_ptr(perf_ibs->pcpu); + struct perf_event *event = pcpu->event; + struct hw_perf_event *hwc; + struct perf_sample_data data; + struct perf_raw_record raw; + struct pt_regs regs; + struct perf_ibs_data ibs_data; + int offset, size, check_rip, offset_max, throttle = 0; + unsigned int msr; + u64 *buf, *config, period, new_config = 0; + + if (!test_bit(IBS_STARTED, pcpu->state)) { +fail: + /* + * Catch spurious interrupts after stopping IBS: After + * disabling IBS there could be still incoming NMIs + * with samples that even have the valid bit cleared. + * Mark all this NMIs as handled. + */ + if (test_and_clear_bit(IBS_STOPPED, pcpu->state)) + return 1; + + return 0; + } + + if (WARN_ON_ONCE(!event)) + goto fail; + + hwc = &event->hw; + msr = hwc->config_base; + buf = ibs_data.regs; + rdmsrl(msr, *buf); + if (!(*buf++ & perf_ibs->valid_mask)) + goto fail; + + config = &ibs_data.regs[0]; + perf_ibs_event_update(perf_ibs, event, config); + perf_sample_data_init(&data, 0, hwc->last_period); + if (!perf_ibs_set_period(perf_ibs, hwc, &period)) + goto out; /* no sw counter overflow */ + + ibs_data.caps = ibs_caps; + size = 1; + offset = 1; + check_rip = (perf_ibs == &perf_ibs_op && (ibs_caps & IBS_CAPS_RIPINVALIDCHK)); + + offset_max = perf_ibs_get_offset_max(perf_ibs, event->attr.sample_type, check_rip); + + do { + rdmsrl(msr + offset, *buf++); + size++; + offset = find_next_bit(perf_ibs->offset_mask, + perf_ibs->offset_max, + offset + 1); + } while (offset < offset_max); + /* + * Read IbsBrTarget, IbsOpData4, and IbsExtdCtl separately + * depending on their availability. + * Can't add to offset_max as they are staggered + */ + if (event->attr.sample_type & PERF_SAMPLE_RAW) { + if (perf_ibs == &perf_ibs_op) { + if (ibs_caps & IBS_CAPS_BRNTRGT) { + rdmsrl(MSR_AMD64_IBSBRTARGET, *buf++); + size++; + } + if (ibs_caps & IBS_CAPS_OPDATA4) { + rdmsrl(MSR_AMD64_IBSOPDATA4, *buf++); + size++; + } + } + if (perf_ibs == &perf_ibs_fetch && (ibs_caps & IBS_CAPS_FETCHCTLEXTD)) { + rdmsrl(MSR_AMD64_ICIBSEXTDCTL, *buf++); + size++; + } + } + ibs_data.size = sizeof(u64) * size; + + regs = *iregs; + if (check_rip && (ibs_data.regs[2] & IBS_RIP_INVALID)) { + regs.flags &= ~PERF_EFLAGS_EXACT; + } else { + /* Workaround for erratum #1197 */ + if (perf_ibs->fetch_ignore_if_zero_rip && !(ibs_data.regs[1])) + goto out; + + set_linear_ip(®s, ibs_data.regs[1]); + regs.flags |= PERF_EFLAGS_EXACT; + } + + if (event->attr.sample_type & PERF_SAMPLE_RAW) { + raw = (struct perf_raw_record){ + .frag = { + .size = sizeof(u32) + ibs_data.size, + .data = ibs_data.data, + }, + }; + perf_sample_save_raw_data(&data, &raw); + } + + if (perf_ibs == &perf_ibs_op) + perf_ibs_parse_ld_st_data(event->attr.sample_type, &ibs_data, &data); + + /* + * rip recorded by IbsOpRip will not be consistent with rsp and rbp + * recorded as part of interrupt regs. Thus we need to use rip from + * interrupt regs while unwinding call stack. + */ + if (event->attr.sample_type & PERF_SAMPLE_CALLCHAIN) + perf_sample_save_callchain(&data, event, iregs); + + throttle = perf_event_overflow(event, &data, ®s); +out: + if (throttle) { + perf_ibs_stop(event, 0); + } else { + if (perf_ibs == &perf_ibs_op) { + if (ibs_caps & IBS_CAPS_OPCNTEXT) { + new_config = period & IBS_OP_MAX_CNT_EXT_MASK; + period &= ~IBS_OP_MAX_CNT_EXT_MASK; + } + if ((ibs_caps & IBS_CAPS_RDWROPCNT) && (*config & IBS_OP_CNT_CTL)) + new_config |= *config & IBS_OP_CUR_CNT_RAND; + } + new_config |= period >> 4; + + perf_ibs_enable_event(perf_ibs, hwc, new_config); + } + + perf_event_update_userpage(event); + + return 1; +} + +static int +perf_ibs_nmi_handler(unsigned int cmd, struct pt_regs *regs) +{ + u64 stamp = sched_clock(); + int handled = 0; + + handled += perf_ibs_handle_irq(&perf_ibs_fetch, regs); + handled += perf_ibs_handle_irq(&perf_ibs_op, regs); + + if (handled) + inc_irq_stat(apic_perf_irqs); + + perf_sample_event_took(sched_clock() - stamp); + + return handled; +} +NOKPROBE_SYMBOL(perf_ibs_nmi_handler); + +static __init int perf_ibs_pmu_init(struct perf_ibs *perf_ibs, char *name) +{ + struct cpu_perf_ibs __percpu *pcpu; + int ret; + + pcpu = alloc_percpu(struct cpu_perf_ibs); + if (!pcpu) + return -ENOMEM; + + perf_ibs->pcpu = pcpu; + + ret = perf_pmu_register(&perf_ibs->pmu, name, -1); + if (ret) { + perf_ibs->pcpu = NULL; + free_percpu(pcpu); + } + + return ret; +} + +static __init int perf_ibs_fetch_init(void) +{ + /* + * Some chips fail to reset the fetch count when it is written; instead + * they need a 0-1 transition of IbsFetchEn. + */ + if (boot_cpu_data.x86 >= 0x16 && boot_cpu_data.x86 <= 0x18) + perf_ibs_fetch.fetch_count_reset_broken = 1; + + if (boot_cpu_data.x86 == 0x19 && boot_cpu_data.x86_model < 0x10) + perf_ibs_fetch.fetch_ignore_if_zero_rip = 1; + + if (ibs_caps & IBS_CAPS_ZEN4) + perf_ibs_fetch.config_mask |= IBS_FETCH_L3MISSONLY; + + perf_ibs_fetch.pmu.attr_groups = fetch_attr_groups; + perf_ibs_fetch.pmu.attr_update = fetch_attr_update; + + return perf_ibs_pmu_init(&perf_ibs_fetch, "ibs_fetch"); +} + +static __init int perf_ibs_op_init(void) +{ + if (ibs_caps & IBS_CAPS_OPCNT) + perf_ibs_op.config_mask |= IBS_OP_CNT_CTL; + + if (ibs_caps & IBS_CAPS_OPCNTEXT) { + perf_ibs_op.max_period |= IBS_OP_MAX_CNT_EXT_MASK; + perf_ibs_op.config_mask |= IBS_OP_MAX_CNT_EXT_MASK; + perf_ibs_op.cnt_mask |= IBS_OP_MAX_CNT_EXT_MASK; + } + + if (ibs_caps & IBS_CAPS_ZEN4) + perf_ibs_op.config_mask |= IBS_OP_L3MISSONLY; + + perf_ibs_op.pmu.attr_groups = empty_attr_groups; + perf_ibs_op.pmu.attr_update = op_attr_update; + + return perf_ibs_pmu_init(&perf_ibs_op, "ibs_op"); +} + +static __init int perf_event_ibs_init(void) +{ + int ret; + + ret = perf_ibs_fetch_init(); + if (ret) + return ret; + + ret = perf_ibs_op_init(); + if (ret) + goto err_op; + + ret = register_nmi_handler(NMI_LOCAL, perf_ibs_nmi_handler, 0, "perf_ibs"); + if (ret) + goto err_nmi; + + pr_info("perf: AMD IBS detected (0x%08x)\n", ibs_caps); + return 0; + +err_nmi: + perf_pmu_unregister(&perf_ibs_op.pmu); + free_percpu(perf_ibs_op.pcpu); + perf_ibs_op.pcpu = NULL; +err_op: + perf_pmu_unregister(&perf_ibs_fetch.pmu); + free_percpu(perf_ibs_fetch.pcpu); + perf_ibs_fetch.pcpu = NULL; + + return ret; +} + +#else /* defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_AMD) */ + +static __init int perf_event_ibs_init(void) +{ + return 0; +} + +#endif + +/* IBS - apic initialization, for perf and oprofile */ + +static __init u32 __get_ibs_caps(void) +{ + u32 caps; + unsigned int max_level; + + if (!boot_cpu_has(X86_FEATURE_IBS)) + return 0; + + /* check IBS cpuid feature flags */ + max_level = cpuid_eax(0x80000000); + if (max_level < IBS_CPUID_FEATURES) + return IBS_CAPS_DEFAULT; + + caps = cpuid_eax(IBS_CPUID_FEATURES); + if (!(caps & IBS_CAPS_AVAIL)) + /* cpuid flags not valid */ + return IBS_CAPS_DEFAULT; + + return caps; +} + +u32 get_ibs_caps(void) +{ + return ibs_caps; +} + +EXPORT_SYMBOL(get_ibs_caps); + +static inline int get_eilvt(int offset) +{ + return !setup_APIC_eilvt(offset, 0, APIC_EILVT_MSG_NMI, 1); +} + +static inline int put_eilvt(int offset) +{ + return !setup_APIC_eilvt(offset, 0, 0, 1); +} + +/* + * Check and reserve APIC extended interrupt LVT offset for IBS if available. + */ +static inline int ibs_eilvt_valid(void) +{ + int offset; + u64 val; + int valid = 0; + + preempt_disable(); + + rdmsrl(MSR_AMD64_IBSCTL, val); + offset = val & IBSCTL_LVT_OFFSET_MASK; + + if (!(val & IBSCTL_LVT_OFFSET_VALID)) { + pr_err(FW_BUG "cpu %d, invalid IBS interrupt offset %d (MSR%08X=0x%016llx)\n", + smp_processor_id(), offset, MSR_AMD64_IBSCTL, val); + goto out; + } + + if (!get_eilvt(offset)) { + pr_err(FW_BUG "cpu %d, IBS interrupt offset %d not available (MSR%08X=0x%016llx)\n", + smp_processor_id(), offset, MSR_AMD64_IBSCTL, val); + goto out; + } + + valid = 1; +out: + preempt_enable(); + + return valid; +} + +static int setup_ibs_ctl(int ibs_eilvt_off) +{ + struct pci_dev *cpu_cfg; + int nodes; + u32 value = 0; + + nodes = 0; + cpu_cfg = NULL; + do { + cpu_cfg = pci_get_device(PCI_VENDOR_ID_AMD, + PCI_DEVICE_ID_AMD_10H_NB_MISC, + cpu_cfg); + if (!cpu_cfg) + break; + ++nodes; + pci_write_config_dword(cpu_cfg, IBSCTL, ibs_eilvt_off + | IBSCTL_LVT_OFFSET_VALID); + pci_read_config_dword(cpu_cfg, IBSCTL, &value); + if (value != (ibs_eilvt_off | IBSCTL_LVT_OFFSET_VALID)) { + pci_dev_put(cpu_cfg); + pr_debug("Failed to setup IBS LVT offset, IBSCTL = 0x%08x\n", + value); + return -EINVAL; + } + } while (1); + + if (!nodes) { + pr_debug("No CPU node configured for IBS\n"); + return -ENODEV; + } + + return 0; +} + +/* + * This runs only on the current cpu. We try to find an LVT offset and + * setup the local APIC. For this we must disable preemption. On + * success we initialize all nodes with this offset. This updates then + * the offset in the IBS_CTL per-node msr. The per-core APIC setup of + * the IBS interrupt vector is handled by perf_ibs_cpu_notifier that + * is using the new offset. + */ +static void force_ibs_eilvt_setup(void) +{ + int offset; + int ret; + + preempt_disable(); + /* find the next free available EILVT entry, skip offset 0 */ + for (offset = 1; offset < APIC_EILVT_NR_MAX; offset++) { + if (get_eilvt(offset)) + break; + } + preempt_enable(); + + if (offset == APIC_EILVT_NR_MAX) { + pr_debug("No EILVT entry available\n"); + return; + } + + ret = setup_ibs_ctl(offset); + if (ret) + goto out; + + if (!ibs_eilvt_valid()) + goto out; + + pr_info("LVT offset %d assigned\n", offset); + + return; +out: + preempt_disable(); + put_eilvt(offset); + preempt_enable(); + return; +} + +static void ibs_eilvt_setup(void) +{ + /* + * Force LVT offset assignment for family 10h: The offsets are + * not assigned by the BIOS for this family, so the OS is + * responsible for doing it. If the OS assignment fails, fall + * back to BIOS settings and try to setup this. + */ + if (boot_cpu_data.x86 == 0x10) + force_ibs_eilvt_setup(); +} + +static inline int get_ibs_lvt_offset(void) +{ + u64 val; + + rdmsrl(MSR_AMD64_IBSCTL, val); + if (!(val & IBSCTL_LVT_OFFSET_VALID)) + return -EINVAL; + + return val & IBSCTL_LVT_OFFSET_MASK; +} + +static void setup_APIC_ibs(void) +{ + int offset; + + offset = get_ibs_lvt_offset(); + if (offset < 0) + goto failed; + + if (!setup_APIC_eilvt(offset, 0, APIC_EILVT_MSG_NMI, 0)) + return; +failed: + pr_warn("perf: IBS APIC setup failed on cpu #%d\n", + smp_processor_id()); +} + +static void clear_APIC_ibs(void) +{ + int offset; + + offset = get_ibs_lvt_offset(); + if (offset >= 0) + setup_APIC_eilvt(offset, 0, APIC_EILVT_MSG_FIX, 1); +} + +static int x86_pmu_amd_ibs_starting_cpu(unsigned int cpu) +{ + setup_APIC_ibs(); + return 0; +} + +#ifdef CONFIG_PM + +static int perf_ibs_suspend(void) +{ + clear_APIC_ibs(); + return 0; +} + +static void perf_ibs_resume(void) +{ + ibs_eilvt_setup(); + setup_APIC_ibs(); +} + +static struct syscore_ops perf_ibs_syscore_ops = { + .resume = perf_ibs_resume, + .suspend = perf_ibs_suspend, +}; + +static void perf_ibs_pm_init(void) +{ + register_syscore_ops(&perf_ibs_syscore_ops); +} + +#else + +static inline void perf_ibs_pm_init(void) { } + +#endif + +static int x86_pmu_amd_ibs_dying_cpu(unsigned int cpu) +{ + clear_APIC_ibs(); + return 0; +} + +static __init int amd_ibs_init(void) +{ + u32 caps; + + caps = __get_ibs_caps(); + if (!caps) + return -ENODEV; /* ibs not supported by the cpu */ + + ibs_eilvt_setup(); + + if (!ibs_eilvt_valid()) + return -EINVAL; + + perf_ibs_pm_init(); + + ibs_caps = caps; + /* make ibs_caps visible to other cpus: */ + smp_mb(); + /* + * x86_pmu_amd_ibs_starting_cpu will be called from core on + * all online cpus. + */ + cpuhp_setup_state(CPUHP_AP_PERF_X86_AMD_IBS_STARTING, + "perf/x86/amd/ibs:starting", + x86_pmu_amd_ibs_starting_cpu, + x86_pmu_amd_ibs_dying_cpu); + + return perf_event_ibs_init(); +} + +/* Since we need the pci subsystem to init ibs we can't do this earlier: */ +device_initcall(amd_ibs_init); |