diff options
Diffstat (limited to 'arch/x86/events/amd/ibs.c')
| -rw-r--r-- | arch/x86/events/amd/ibs.c | 141 |
1 files changed, 120 insertions, 21 deletions
diff --git a/arch/x86/events/amd/ibs.c b/arch/x86/events/amd/ibs.c index 6911c5399d02..e36c9c63c97c 100644 --- a/arch/x86/events/amd/ibs.c +++ b/arch/x86/events/amd/ibs.c @@ -31,6 +31,8 @@ static u32 ibs_caps; #define IBS_FETCH_CONFIG_MASK (IBS_FETCH_RAND_EN | IBS_FETCH_MAX_CNT) #define IBS_OP_CONFIG_MASK IBS_OP_MAX_CNT +/* attr.config2 */ +#define IBS_SW_FILTER_MASK 1 /* * IBS states: @@ -287,6 +289,19 @@ static int perf_ibs_init(struct perf_event *event) if (config & ~perf_ibs->config_mask) return -EINVAL; + if (has_branch_stack(event)) + return -EOPNOTSUPP; + + /* handle exclude_{user,kernel} in the IRQ handler */ + if (event->attr.exclude_host || event->attr.exclude_guest || + event->attr.exclude_idle) + return -EINVAL; + + if (!(event->attr.config2 & IBS_SW_FILTER_MASK) && + (event->attr.exclude_kernel || event->attr.exclude_user || + event->attr.exclude_hv)) + return -EINVAL; + ret = validate_group(event); if (ret) return ret; @@ -547,24 +562,14 @@ 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_FORMAT_ATTR(swfilt, "config2:0"); 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"); @@ -575,8 +580,9 @@ zen4_ibs_extensions_is_visible(struct kobject *kobj, struct attribute *attr, int return ibs_caps & IBS_CAPS_ZEN4 ? attr->mode : 0; } -static struct attribute *rand_en_attrs[] = { +static struct attribute *fetch_attrs[] = { &format_attr_rand_en.attr, + &format_attr_swfilt.attr, NULL, }; @@ -590,9 +596,9 @@ static struct attribute *zen4_ibs_extensions_attrs[] = { NULL, }; -static struct attribute_group group_rand_en = { +static struct attribute_group group_fetch_formats = { .name = "format", - .attrs = rand_en_attrs, + .attrs = fetch_attrs, }; static struct attribute_group group_fetch_l3missonly = { @@ -608,7 +614,7 @@ static struct attribute_group group_zen4_ibs_extensions = { }; static const struct attribute_group *fetch_attr_groups[] = { - &group_rand_en, + &group_fetch_formats, &empty_caps_group, NULL, }; @@ -625,6 +631,11 @@ cnt_ctl_is_visible(struct kobject *kobj, struct attribute *attr, int i) return ibs_caps & IBS_CAPS_OPCNT ? attr->mode : 0; } +static struct attribute *op_attrs[] = { + &format_attr_swfilt.attr, + NULL, +}; + static struct attribute *cnt_ctl_attrs[] = { &format_attr_cnt_ctl.attr, NULL, @@ -635,6 +646,11 @@ static struct attribute *op_l3missonly_attrs[] = { NULL, }; +static struct attribute_group group_op_formats = { + .name = "format", + .attrs = op_attrs, +}; + static struct attribute_group group_cnt_ctl = { .name = "format", .attrs = cnt_ctl_attrs, @@ -647,6 +663,12 @@ static struct attribute_group group_op_l3missonly = { .is_visible = zen4_ibs_extensions_is_visible, }; +static const struct attribute_group *op_attr_groups[] = { + &group_op_formats, + &empty_caps_group, + NULL, +}; + static const struct attribute_group *op_attr_update[] = { &group_cnt_ctl, &group_op_l3missonly, @@ -664,7 +686,6 @@ static struct perf_ibs perf_ibs_fetch = { .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, @@ -688,7 +709,6 @@ static struct perf_ibs perf_ibs_op = { .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, @@ -921,6 +941,8 @@ static void perf_ibs_get_mem_lock(union ibs_op_data3 *op_data3, data_src->mem_lock = PERF_MEM_LOCK_LOCKED; } +/* Be careful. Works only for contiguous MSRs. */ +#define ibs_fetch_msr_idx(msr) (msr - MSR_AMD64_IBSFETCHCTL) #define ibs_op_msr_idx(msr) (msr - MSR_AMD64_IBSOPCTL) static void perf_ibs_get_data_src(struct perf_ibs_data *ibs_data, @@ -1016,6 +1038,67 @@ static int perf_ibs_get_offset_max(struct perf_ibs *perf_ibs, u64 sample_type, return 1; } +static bool perf_ibs_is_kernel_data_addr(struct perf_event *event, + struct perf_ibs_data *ibs_data) +{ + u64 sample_type_mask = PERF_SAMPLE_ADDR | PERF_SAMPLE_RAW; + union ibs_op_data3 op_data3; + u64 dc_lin_addr; + + op_data3.val = ibs_data->regs[ibs_op_msr_idx(MSR_AMD64_IBSOPDATA3)]; + dc_lin_addr = ibs_data->regs[ibs_op_msr_idx(MSR_AMD64_IBSDCLINAD)]; + + return unlikely((event->attr.sample_type & sample_type_mask) && + op_data3.dc_lin_addr_valid && kernel_ip(dc_lin_addr)); +} + +static bool perf_ibs_is_kernel_br_target(struct perf_event *event, + struct perf_ibs_data *ibs_data, + int br_target_idx) +{ + union ibs_op_data op_data; + u64 br_target; + + op_data.val = ibs_data->regs[ibs_op_msr_idx(MSR_AMD64_IBSOPDATA)]; + br_target = ibs_data->regs[br_target_idx]; + + return unlikely((event->attr.sample_type & PERF_SAMPLE_RAW) && + op_data.op_brn_ret && kernel_ip(br_target)); +} + +static bool perf_ibs_swfilt_discard(struct perf_ibs *perf_ibs, struct perf_event *event, + struct pt_regs *regs, struct perf_ibs_data *ibs_data, + int br_target_idx) +{ + if (perf_exclude_event(event, regs)) + return true; + + if (perf_ibs != &perf_ibs_op || !event->attr.exclude_kernel) + return false; + + if (perf_ibs_is_kernel_data_addr(event, ibs_data)) + return true; + + if (br_target_idx != -1 && + perf_ibs_is_kernel_br_target(event, ibs_data, br_target_idx)) + return true; + + return false; +} + +static void perf_ibs_phyaddr_clear(struct perf_ibs *perf_ibs, + struct perf_ibs_data *ibs_data) +{ + if (perf_ibs == &perf_ibs_op) { + ibs_data->regs[ibs_op_msr_idx(MSR_AMD64_IBSOPDATA3)] &= ~(1ULL << 18); + ibs_data->regs[ibs_op_msr_idx(MSR_AMD64_IBSDCPHYSAD)] = 0; + return; + } + + ibs_data->regs[ibs_fetch_msr_idx(MSR_AMD64_IBSFETCHCTL)] &= ~(1ULL << 52); + ibs_data->regs[ibs_fetch_msr_idx(MSR_AMD64_IBSFETCHPHYSAD)] = 0; +} + 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); @@ -1028,6 +1111,7 @@ static int perf_ibs_handle_irq(struct perf_ibs *perf_ibs, struct pt_regs *iregs) int offset, size, check_rip, offset_max, throttle = 0; unsigned int msr; u64 *buf, *config, period, new_config = 0; + int br_target_idx = -1; if (!test_bit(IBS_STARTED, pcpu->state)) { fail: @@ -1082,6 +1166,7 @@ fail: if (perf_ibs == &perf_ibs_op) { if (ibs_caps & IBS_CAPS_BRNTRGT) { rdmsrl(MSR_AMD64_IBSBRTARGET, *buf++); + br_target_idx = size; size++; } if (ibs_caps & IBS_CAPS_OPDATA4) { @@ -1108,6 +1193,21 @@ fail: regs.flags |= PERF_EFLAGS_EXACT; } + if ((event->attr.config2 & IBS_SW_FILTER_MASK) && + perf_ibs_swfilt_discard(perf_ibs, event, ®s, &ibs_data, br_target_idx)) { + throttle = perf_event_account_interrupt(event); + goto out; + } + /* + * Prevent leaking physical addresses to unprivileged users. Skip + * PERF_SAMPLE_PHYS_ADDR check since generic code prevents it for + * unprivileged users. + */ + if ((event->attr.sample_type & PERF_SAMPLE_RAW) && + perf_allow_kernel(&event->attr)) { + perf_ibs_phyaddr_clear(perf_ibs, &ibs_data); + } + if (event->attr.sample_type & PERF_SAMPLE_RAW) { raw = (struct perf_raw_record){ .frag = { @@ -1115,7 +1215,7 @@ fail: .data = ibs_data.data, }, }; - perf_sample_save_raw_data(&data, &raw); + perf_sample_save_raw_data(&data, event, &raw); } if (perf_ibs == &perf_ibs_op) @@ -1126,8 +1226,7 @@ fail: * 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); + perf_sample_save_callchain(&data, event, iregs); throttle = perf_event_overflow(event, &data, ®s); out: @@ -1225,7 +1324,7 @@ static __init int perf_ibs_op_init(void) 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_groups = op_attr_groups; perf_ibs_op.pmu.attr_update = op_attr_update; return perf_ibs_pmu_init(&perf_ibs_op, "ibs_op"); |