diff options
Diffstat (limited to 'arch/x86/kernel/cpu/perf_event_intel_bts.c')
| -rw-r--r-- | arch/x86/kernel/cpu/perf_event_intel_bts.c | 525 |
1 files changed, 525 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/perf_event_intel_bts.c b/arch/x86/kernel/cpu/perf_event_intel_bts.c new file mode 100644 index 000000000000..ac1f0c55f379 --- /dev/null +++ b/arch/x86/kernel/cpu/perf_event_intel_bts.c @@ -0,0 +1,525 @@ +/* + * BTS PMU driver for perf + * Copyright (c) 2013-2014, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#undef DEBUG + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/bitops.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/debugfs.h> +#include <linux/device.h> +#include <linux/coredump.h> + +#include <asm-generic/sizes.h> +#include <asm/perf_event.h> + +#include "perf_event.h" + +struct bts_ctx { + struct perf_output_handle handle; + struct debug_store ds_back; + int started; +}; + +static DEFINE_PER_CPU(struct bts_ctx, bts_ctx); + +#define BTS_RECORD_SIZE 24 +#define BTS_SAFETY_MARGIN 4080 + +struct bts_phys { + struct page *page; + unsigned long size; + unsigned long offset; + unsigned long displacement; +}; + +struct bts_buffer { + size_t real_size; /* multiple of BTS_RECORD_SIZE */ + unsigned int nr_pages; + unsigned int nr_bufs; + unsigned int cur_buf; + bool snapshot; + local_t data_size; + local_t lost; + local_t head; + unsigned long end; + void **data_pages; + struct bts_phys buf[0]; +}; + +struct pmu bts_pmu; + +void intel_pmu_enable_bts(u64 config); +void intel_pmu_disable_bts(void); + +static size_t buf_size(struct page *page) +{ + return 1 << (PAGE_SHIFT + page_private(page)); +} + +static void * +bts_buffer_setup_aux(int cpu, void **pages, int nr_pages, bool overwrite) +{ + struct bts_buffer *buf; + struct page *page; + int node = (cpu == -1) ? cpu : cpu_to_node(cpu); + unsigned long offset; + size_t size = nr_pages << PAGE_SHIFT; + int pg, nbuf, pad; + + /* count all the high order buffers */ + for (pg = 0, nbuf = 0; pg < nr_pages;) { + page = virt_to_page(pages[pg]); + if (WARN_ON_ONCE(!PagePrivate(page) && nr_pages > 1)) + return NULL; + pg += 1 << page_private(page); + nbuf++; + } + + /* + * to avoid interrupts in overwrite mode, only allow one physical + */ + if (overwrite && nbuf > 1) + return NULL; + + buf = kzalloc_node(offsetof(struct bts_buffer, buf[nbuf]), GFP_KERNEL, node); + if (!buf) + return NULL; + + buf->nr_pages = nr_pages; + buf->nr_bufs = nbuf; + buf->snapshot = overwrite; + buf->data_pages = pages; + buf->real_size = size - size % BTS_RECORD_SIZE; + + for (pg = 0, nbuf = 0, offset = 0, pad = 0; nbuf < buf->nr_bufs; nbuf++) { + unsigned int __nr_pages; + + page = virt_to_page(pages[pg]); + __nr_pages = PagePrivate(page) ? 1 << page_private(page) : 1; + buf->buf[nbuf].page = page; + buf->buf[nbuf].offset = offset; + buf->buf[nbuf].displacement = (pad ? BTS_RECORD_SIZE - pad : 0); + buf->buf[nbuf].size = buf_size(page) - buf->buf[nbuf].displacement; + pad = buf->buf[nbuf].size % BTS_RECORD_SIZE; + buf->buf[nbuf].size -= pad; + + pg += __nr_pages; + offset += __nr_pages << PAGE_SHIFT; + } + + return buf; +} + +static void bts_buffer_free_aux(void *data) +{ + kfree(data); +} + +static unsigned long bts_buffer_offset(struct bts_buffer *buf, unsigned int idx) +{ + return buf->buf[idx].offset + buf->buf[idx].displacement; +} + +static void +bts_config_buffer(struct bts_buffer *buf) +{ + int cpu = raw_smp_processor_id(); + struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds; + struct bts_phys *phys = &buf->buf[buf->cur_buf]; + unsigned long index, thresh = 0, end = phys->size; + struct page *page = phys->page; + + index = local_read(&buf->head); + + if (!buf->snapshot) { + if (buf->end < phys->offset + buf_size(page)) + end = buf->end - phys->offset - phys->displacement; + + index -= phys->offset + phys->displacement; + + if (end - index > BTS_SAFETY_MARGIN) + thresh = end - BTS_SAFETY_MARGIN; + else if (end - index > BTS_RECORD_SIZE) + thresh = end - BTS_RECORD_SIZE; + else + thresh = end; + } + + ds->bts_buffer_base = (u64)(long)page_address(page) + phys->displacement; + ds->bts_index = ds->bts_buffer_base + index; + ds->bts_absolute_maximum = ds->bts_buffer_base + end; + ds->bts_interrupt_threshold = !buf->snapshot + ? ds->bts_buffer_base + thresh + : ds->bts_absolute_maximum + BTS_RECORD_SIZE; +} + +static void bts_buffer_pad_out(struct bts_phys *phys, unsigned long head) +{ + unsigned long index = head - phys->offset; + + memset(page_address(phys->page) + index, 0, phys->size - index); +} + +static bool bts_buffer_is_full(struct bts_buffer *buf, struct bts_ctx *bts) +{ + if (buf->snapshot) + return false; + + if (local_read(&buf->data_size) >= bts->handle.size || + bts->handle.size - local_read(&buf->data_size) < BTS_RECORD_SIZE) + return true; + + return false; +} + +static void bts_update(struct bts_ctx *bts) +{ + int cpu = raw_smp_processor_id(); + struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds; + struct bts_buffer *buf = perf_get_aux(&bts->handle); + unsigned long index = ds->bts_index - ds->bts_buffer_base, old, head; + + if (!buf) + return; + + head = index + bts_buffer_offset(buf, buf->cur_buf); + old = local_xchg(&buf->head, head); + + if (!buf->snapshot) { + if (old == head) + return; + + if (ds->bts_index >= ds->bts_absolute_maximum) + local_inc(&buf->lost); + + /* + * old and head are always in the same physical buffer, so we + * can subtract them to get the data size. + */ + local_add(head - old, &buf->data_size); + } else { + local_set(&buf->data_size, head); + } +} + +static void __bts_event_start(struct perf_event *event) +{ + struct bts_ctx *bts = this_cpu_ptr(&bts_ctx); + struct bts_buffer *buf = perf_get_aux(&bts->handle); + u64 config = 0; + + if (!buf || bts_buffer_is_full(buf, bts)) + return; + + event->hw.state = 0; + + if (!buf->snapshot) + config |= ARCH_PERFMON_EVENTSEL_INT; + if (!event->attr.exclude_kernel) + config |= ARCH_PERFMON_EVENTSEL_OS; + if (!event->attr.exclude_user) + config |= ARCH_PERFMON_EVENTSEL_USR; + + bts_config_buffer(buf); + + /* + * local barrier to make sure that ds configuration made it + * before we enable BTS + */ + wmb(); + + intel_pmu_enable_bts(config); +} + +static void bts_event_start(struct perf_event *event, int flags) +{ + struct bts_ctx *bts = this_cpu_ptr(&bts_ctx); + + __bts_event_start(event); + + /* PMI handler: this counter is running and likely generating PMIs */ + ACCESS_ONCE(bts->started) = 1; +} + +static void __bts_event_stop(struct perf_event *event) +{ + /* + * No extra synchronization is mandated by the documentation to have + * BTS data stores globally visible. + */ + intel_pmu_disable_bts(); + + if (event->hw.state & PERF_HES_STOPPED) + return; + + ACCESS_ONCE(event->hw.state) |= PERF_HES_STOPPED; +} + +static void bts_event_stop(struct perf_event *event, int flags) +{ + struct bts_ctx *bts = this_cpu_ptr(&bts_ctx); + + /* PMI handler: don't restart this counter */ + ACCESS_ONCE(bts->started) = 0; + + __bts_event_stop(event); + + if (flags & PERF_EF_UPDATE) + bts_update(bts); +} + +void intel_bts_enable_local(void) +{ + struct bts_ctx *bts = this_cpu_ptr(&bts_ctx); + + if (bts->handle.event && bts->started) + __bts_event_start(bts->handle.event); +} + +void intel_bts_disable_local(void) +{ + struct bts_ctx *bts = this_cpu_ptr(&bts_ctx); + + if (bts->handle.event) + __bts_event_stop(bts->handle.event); +} + +static int +bts_buffer_reset(struct bts_buffer *buf, struct perf_output_handle *handle) +{ + unsigned long head, space, next_space, pad, gap, skip, wakeup; + unsigned int next_buf; + struct bts_phys *phys, *next_phys; + int ret; + + if (buf->snapshot) + return 0; + + head = handle->head & ((buf->nr_pages << PAGE_SHIFT) - 1); + if (WARN_ON_ONCE(head != local_read(&buf->head))) + return -EINVAL; + + phys = &buf->buf[buf->cur_buf]; + space = phys->offset + phys->displacement + phys->size - head; + pad = space; + if (space > handle->size) { + space = handle->size; + space -= space % BTS_RECORD_SIZE; + } + if (space <= BTS_SAFETY_MARGIN) { + /* See if next phys buffer has more space */ + next_buf = buf->cur_buf + 1; + if (next_buf >= buf->nr_bufs) + next_buf = 0; + next_phys = &buf->buf[next_buf]; + gap = buf_size(phys->page) - phys->displacement - phys->size + + next_phys->displacement; + skip = pad + gap; + if (handle->size >= skip) { + next_space = next_phys->size; + if (next_space + skip > handle->size) { + next_space = handle->size - skip; + next_space -= next_space % BTS_RECORD_SIZE; + } + if (next_space > space || !space) { + if (pad) + bts_buffer_pad_out(phys, head); + ret = perf_aux_output_skip(handle, skip); + if (ret) + return ret; + /* Advance to next phys buffer */ + phys = next_phys; + space = next_space; + head = phys->offset + phys->displacement; + /* + * After this, cur_buf and head won't match ds + * anymore, so we must not be racing with + * bts_update(). + */ + buf->cur_buf = next_buf; + local_set(&buf->head, head); + } + } + } + + /* Don't go far beyond wakeup watermark */ + wakeup = BTS_SAFETY_MARGIN + BTS_RECORD_SIZE + handle->wakeup - + handle->head; + if (space > wakeup) { + space = wakeup; + space -= space % BTS_RECORD_SIZE; + } + + buf->end = head + space; + + /* + * If we have no space, the lost notification would have been sent when + * we hit absolute_maximum - see bts_update() + */ + if (!space) + return -ENOSPC; + + return 0; +} + +int intel_bts_interrupt(void) +{ + struct bts_ctx *bts = this_cpu_ptr(&bts_ctx); + struct perf_event *event = bts->handle.event; + struct bts_buffer *buf; + s64 old_head; + int err; + + if (!event || !bts->started) + return 0; + + buf = perf_get_aux(&bts->handle); + /* + * Skip snapshot counters: they don't use the interrupt, but + * there's no other way of telling, because the pointer will + * keep moving + */ + if (!buf || buf->snapshot) + return 0; + + old_head = local_read(&buf->head); + bts_update(bts); + + /* no new data */ + if (old_head == local_read(&buf->head)) + return 0; + + perf_aux_output_end(&bts->handle, local_xchg(&buf->data_size, 0), + !!local_xchg(&buf->lost, 0)); + + buf = perf_aux_output_begin(&bts->handle, event); + if (!buf) + return 1; + + err = bts_buffer_reset(buf, &bts->handle); + if (err) + perf_aux_output_end(&bts->handle, 0, false); + + return 1; +} + +static void bts_event_del(struct perf_event *event, int mode) +{ + struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); + struct bts_ctx *bts = this_cpu_ptr(&bts_ctx); + struct bts_buffer *buf = perf_get_aux(&bts->handle); + + bts_event_stop(event, PERF_EF_UPDATE); + + if (buf) { + if (buf->snapshot) + bts->handle.head = + local_xchg(&buf->data_size, + buf->nr_pages << PAGE_SHIFT); + perf_aux_output_end(&bts->handle, local_xchg(&buf->data_size, 0), + !!local_xchg(&buf->lost, 0)); + } + + cpuc->ds->bts_index = bts->ds_back.bts_buffer_base; + cpuc->ds->bts_buffer_base = bts->ds_back.bts_buffer_base; + cpuc->ds->bts_absolute_maximum = bts->ds_back.bts_absolute_maximum; + cpuc->ds->bts_interrupt_threshold = bts->ds_back.bts_interrupt_threshold; +} + +static int bts_event_add(struct perf_event *event, int mode) +{ + struct bts_buffer *buf; + struct bts_ctx *bts = this_cpu_ptr(&bts_ctx); + struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); + struct hw_perf_event *hwc = &event->hw; + int ret = -EBUSY; + + event->hw.state = PERF_HES_STOPPED; + + if (test_bit(INTEL_PMC_IDX_FIXED_BTS, cpuc->active_mask)) + return -EBUSY; + + if (bts->handle.event) + return -EBUSY; + + buf = perf_aux_output_begin(&bts->handle, event); + if (!buf) + return -EINVAL; + + ret = bts_buffer_reset(buf, &bts->handle); + if (ret) { + perf_aux_output_end(&bts->handle, 0, false); + return ret; + } + + bts->ds_back.bts_buffer_base = cpuc->ds->bts_buffer_base; + bts->ds_back.bts_absolute_maximum = cpuc->ds->bts_absolute_maximum; + bts->ds_back.bts_interrupt_threshold = cpuc->ds->bts_interrupt_threshold; + + if (mode & PERF_EF_START) { + bts_event_start(event, 0); + if (hwc->state & PERF_HES_STOPPED) { + bts_event_del(event, 0); + return -EBUSY; + } + } + + return 0; +} + +static void bts_event_destroy(struct perf_event *event) +{ + x86_del_exclusive(x86_lbr_exclusive_bts); +} + +static int bts_event_init(struct perf_event *event) +{ + if (event->attr.type != bts_pmu.type) + return -ENOENT; + + if (x86_add_exclusive(x86_lbr_exclusive_bts)) + return -EBUSY; + + event->destroy = bts_event_destroy; + + return 0; +} + +static void bts_event_read(struct perf_event *event) +{ +} + +static __init int bts_init(void) +{ + if (!boot_cpu_has(X86_FEATURE_DTES64) || !x86_pmu.bts) + return -ENODEV; + + bts_pmu.capabilities = PERF_PMU_CAP_AUX_NO_SG | PERF_PMU_CAP_ITRACE; + bts_pmu.task_ctx_nr = perf_sw_context; + bts_pmu.event_init = bts_event_init; + bts_pmu.add = bts_event_add; + bts_pmu.del = bts_event_del; + bts_pmu.start = bts_event_start; + bts_pmu.stop = bts_event_stop; + bts_pmu.read = bts_event_read; + bts_pmu.setup_aux = bts_buffer_setup_aux; + bts_pmu.free_aux = bts_buffer_free_aux; + + return perf_pmu_register(&bts_pmu, "intel_bts", -1); +} + +module_init(bts_init); |