From: Hendrik Brueckner Date: Fri, 13 Dec 2013 10:42:44 +0000 (+0100) Subject: s390/cpum_sf: Add raw data sampling to support the diagnostic-sampling function X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=7e75fc3ff4cffd90684816d69838f8730ac3e072;p=linux-beck.git s390/cpum_sf: Add raw data sampling to support the diagnostic-sampling function Also support the diagnostic-sampling function in addition to the basic-sampling function. Diagnostic-sampling data entries contain hardware model specific sampling data and additional programs are required to analyze the data. To deliver diagnostic-sampling, as well, as basis-sampling data entries to user space, introduce support for sampling "raw data". If this particular perf sampling type (PERF_SAMPLE_RAW) is used, sampling data entries are copied to user space. External programs can then analyze these data. Signed-off-by: Hendrik Brueckner Signed-off-by: Martin Schwidefsky --- diff --git a/arch/s390/include/asm/cpu_mf.h b/arch/s390/include/asm/cpu_mf.h index 09dc5facc0bc..cb700d54bd83 100644 --- a/arch/s390/include/asm/cpu_mf.h +++ b/arch/s390/include/asm/cpu_mf.h @@ -59,13 +59,15 @@ struct cpumf_ctr_info { /* QUERY SAMPLING INFORMATION block */ struct hws_qsi_info_block { /* Bit(s) */ unsigned int b0_13:14; /* 0-13: zeros */ - unsigned int as:1; /* 14: sampling authorisation control*/ - unsigned int b15_21:7; /* 15-21: zeros */ - unsigned int es:1; /* 22: sampling enable control */ - unsigned int b23_29:7; /* 23-29: zeros */ - unsigned int cs:1; /* 30: sampling activation control */ - unsigned int:1; /* 31: reserved */ - unsigned int bsdes:16; /* 4-5: size of basic sampling entry */ + unsigned int as:1; /* 14: basic-sampling authorization */ + unsigned int ad:1; /* 15: diag-sampling authorization */ + unsigned int b16_21:6; /* 16-21: zeros */ + unsigned int es:1; /* 22: basic-sampling enable control */ + unsigned int ed:1; /* 23: diag-sampling enable control */ + unsigned int b24_29:6; /* 24-29: zeros */ + unsigned int cs:1; /* 30: basic-sampling activation control */ + unsigned int cd:1; /* 31: diag-sampling activation control */ + unsigned int bsdes:16; /* 4-5: size of basic sampling entry */ unsigned int dsdes:16; /* 6-7: size of diagnostic sampling entry */ unsigned long min_sampl_rate; /* 8-15: minimum sampling interval */ unsigned long max_sampl_rate; /* 16-23: maximum sampling interval*/ @@ -82,10 +84,11 @@ struct hws_lsctl_request_block { unsigned int s:1; /* 0: maximum buffer indicator */ unsigned int h:1; /* 1: part. level reserved for VM use*/ unsigned long long b2_53:52;/* 2-53: zeros */ - unsigned int es:1; /* 54: sampling enable control */ - unsigned int b55_61:7; /* 55-61: - zeros */ - unsigned int cs:1; /* 62: sampling activation control */ - unsigned int b63:1; /* 63: zero */ + unsigned int es:1; /* 54: basic-sampling enable control */ + unsigned int ed:1; /* 55: diag-sampling enable control */ + unsigned int b56_61:6; /* 56-61: - zeros */ + unsigned int cs:1; /* 62: basic-sampling activation control */ + unsigned int cd:1; /* 63: diag-sampling activation control */ unsigned long interval; /* 8-15: sampling interval */ unsigned long tear; /* 16-23: TEAR contents */ unsigned long dear; /* 24-31: DEAR contents */ @@ -96,8 +99,7 @@ struct hws_lsctl_request_block { unsigned long rsvrd4; /* reserved */ } __packed; - -struct hws_data_entry { +struct hws_basic_entry { unsigned int def:16; /* 0-15 Data Entry Format */ unsigned int R:4; /* 16-19 reserved */ unsigned int U:4; /* 20-23 Number of unique instruct. */ @@ -114,6 +116,18 @@ struct hws_data_entry { unsigned long long hpp; /* Host Program Parameter */ } __packed; +struct hws_diag_entry { + unsigned int def:16; /* 0-15 Data Entry Format */ + unsigned int R:14; /* 16-19 and 20-30 reserved */ + unsigned int I:1; /* 31 entry valid or invalid */ + u8 data[]; /* Machine-dependent sample data */ +} __packed; + +struct hws_combined_entry { + struct hws_basic_entry basic; /* Basic-sampling data entry */ + struct hws_diag_entry diag; /* Diagnostic-sampling data entry */ +} __packed; + struct hws_trailer_entry { union { struct { diff --git a/arch/s390/include/asm/perf_event.h b/arch/s390/include/asm/perf_event.h index 7667bde37dcb..bd4573f1d65c 100644 --- a/arch/s390/include/asm/perf_event.h +++ b/arch/s390/include/asm/perf_event.h @@ -52,15 +52,39 @@ struct perf_sf_sde_regs { #define PERF_CPUM_CF_MAX_CTR 256 /* Perf PMU definitions for the sampling facility */ -#define PERF_CPUM_SF_MAX_CTR 1 -#define PERF_EVENT_CPUM_SF 0xB0000UL /* Raw event ID */ +#define PERF_CPUM_SF_MAX_CTR 2 +#define PERF_EVENT_CPUM_SF 0xB0000UL /* Event: Basic-sampling */ +#define PERF_EVENT_CPUM_SF_DIAG 0xBD000UL /* Event: Combined-sampling */ +#define PERF_CPUM_SF_BASIC_MODE 0x0001 /* Basic-sampling flag */ +#define PERF_CPUM_SF_DIAG_MODE 0x0002 /* Diagnostic-sampling flag */ +#define PERF_CPUM_SF_MODE_MASK (PERF_CPUM_SF_BASIC_MODE| \ + PERF_CPUM_SF_DIAG_MODE) #define REG_NONE 0 #define REG_OVERFLOW 1 #define OVERFLOW_REG(hwc) ((hwc)->extra_reg.config) #define SFB_ALLOC_REG(hwc) ((hwc)->extra_reg.alloc) +#define RAWSAMPLE_REG(hwc) ((hwc)->config) #define TEAR_REG(hwc) ((hwc)->last_tag) #define SAMPL_RATE(hwc) ((hwc)->event_base) +#define SAMPL_FLAGS(hwc) ((hwc)->config_base) +#define SAMPL_DIAG_MODE(hwc) (SAMPL_FLAGS(hwc) & PERF_CPUM_SF_DIAG_MODE) + +/* Structure for sampling data entries to be passed as perf raw sample data + * to user space. Note that raw sample data must be aligned and, thus, might + * be padded with zeros. + */ +struct sf_raw_sample { +#define SF_RAW_SAMPLE_BASIC PERF_CPUM_SF_BASIC_MODE +#define SF_RAW_SAMPLE_DIAG PERF_CPUM_SF_DIAG_MODE + u64 format; + u32 size; /* Size of sf_raw_sample */ + u16 bsdes; /* Basic-sampling data entry size */ + u16 dsdes; /* Diagnostic-sampling data entry size */ + struct hws_basic_entry basic; /* Basic-sampling data entry */ + struct hws_diag_entry diag; /* Diagnostic-sampling data entry */ + u8 padding[]; /* Padding to next multiple of 8 */ +} __packed; /* Perf hardware reserve and release functions */ int perf_reserve_sampling(void); diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c index 28fa2f235158..b4ec058c4f10 100644 --- a/arch/s390/kernel/perf_cpum_sf.c +++ b/arch/s390/kernel/perf_cpum_sf.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include #include @@ -31,8 +32,8 @@ #define CPUM_SF_MIN_SDBT 1 /* Number of sample-data-blocks per sample-data-block-table (SDBT): - * The table contains SDB origin (8 bytes) and one SDBT origin that - * points to the next table. + * A table contains SDB pointers (8 bytes) and one table-link entry + * that points to the origin of the next SDBT. */ #define CPUM_SF_SDB_PER_TABLE ((PAGE_SIZE - 8) / 8) @@ -48,8 +49,11 @@ static inline int require_table_link(const void *sdbt) /* Minimum and maximum sampling buffer sizes: * - * This number represents the maximum size of the sampling buffer - * taking the number of sample-data-block-tables into account. + * This number represents the maximum size of the sampling buffer taking + * the number of sample-data-block-tables into account. Note that these + * numbers apply to the basic-sampling function only. + * The maximum number of SDBs is increased by CPUM_SF_SDB_DIAG_FACTOR if + * the diagnostic-sampling function is active. * * Sampling buffer size Buffer characteristics * --------------------------------------------------- @@ -63,6 +67,7 @@ static inline int require_table_link(const void *sdbt) */ static unsigned long __read_mostly CPUM_SF_MIN_SDB = 15; static unsigned long __read_mostly CPUM_SF_MAX_SDB = 8176; +static unsigned long __read_mostly CPUM_SF_SDB_DIAG_FACTOR = 1; struct sf_buffer { unsigned long *sdbt; /* Sample-data-block-table origin */ @@ -290,8 +295,20 @@ static int alloc_sampling_buffer(struct sf_buffer *sfb, unsigned long num_sdb) static void sfb_set_limits(unsigned long min, unsigned long max) { + struct hws_qsi_info_block si; + CPUM_SF_MIN_SDB = min; CPUM_SF_MAX_SDB = max; + + memset(&si, 0, sizeof(si)); + if (!qsi(&si)) + CPUM_SF_SDB_DIAG_FACTOR = DIV_ROUND_UP(si.dsdes, si.bsdes); +} + +static unsigned long sfb_max_limit(struct hw_perf_event *hwc) +{ + return SAMPL_DIAG_MODE(hwc) ? CPUM_SF_MAX_SDB * CPUM_SF_SDB_DIAG_FACTOR + : CPUM_SF_MAX_SDB; } static unsigned long sfb_pending_allocs(struct sf_buffer *sfb, @@ -312,8 +329,8 @@ static int sfb_has_pending_allocs(struct sf_buffer *sfb, static void sfb_account_allocs(unsigned long num, struct hw_perf_event *hwc) { - /* Limit the number SDBs to not exceed the maximum */ - num = min_t(unsigned long, num, CPUM_SF_MAX_SDB - SFB_ALLOC_REG(hwc)); + /* Limit the number of SDBs to not exceed the maximum */ + num = min_t(unsigned long, num, sfb_max_limit(hwc) - SFB_ALLOC_REG(hwc)); if (num) SFB_ALLOC_REG(hwc) += num; } @@ -324,32 +341,89 @@ static void sfb_init_allocs(unsigned long num, struct hw_perf_event *hwc) sfb_account_allocs(num, hwc); } -static int allocate_sdbt(struct cpu_hw_sf *cpuhw, struct hw_perf_event *hwc) +static size_t event_sample_size(struct hw_perf_event *hwc) +{ + struct sf_raw_sample *sfr = (struct sf_raw_sample *) RAWSAMPLE_REG(hwc); + size_t sample_size; + + /* The sample size depends on the sampling function: The basic-sampling + * function must be always enabled, diagnostic-sampling function is + * optional. + */ + sample_size = sfr->bsdes; + if (SAMPL_DIAG_MODE(hwc)) + sample_size += sfr->dsdes; + + return sample_size; +} + +static void deallocate_buffers(struct cpu_hw_sf *cpuhw) +{ + if (cpuhw->sfb.sdbt) + free_sampling_buffer(&cpuhw->sfb); +} + +static int allocate_buffers(struct cpu_hw_sf *cpuhw, struct hw_perf_event *hwc) { - unsigned long n_sdb, freq; - unsigned long factor; + unsigned long n_sdb, freq, factor; + size_t sfr_size, sample_size; + struct sf_raw_sample *sfr; + + /* Allocate raw sample buffer + * + * The raw sample buffer is used to temporarily store sampling data + * entries for perf raw sample processing. The buffer size mainly + * depends on the size of diagnostic-sampling data entries which is + * machine-specific. The exact size calculation includes: + * 1. The first 4 bytes of diagnostic-sampling data entries are + * already reflected in the sf_raw_sample structure. Subtract + * these bytes. + * 2. The perf raw sample data must be 8-byte aligned (u64) and + * perf's internal data size must be considered too. So add + * an additional u32 for correct alignment and subtract before + * allocating the buffer. + * 3. Store the raw sample buffer pointer in the perf event + * hardware structure. + */ + sfr_size = ALIGN((sizeof(*sfr) - sizeof(sfr->diag) + cpuhw->qsi.dsdes) + + sizeof(u32), sizeof(u64)); + sfr_size -= sizeof(u32); + sfr = kzalloc(sfr_size, GFP_KERNEL); + if (!sfr) + return -ENOMEM; + sfr->size = sfr_size; + sfr->bsdes = cpuhw->qsi.bsdes; + sfr->dsdes = cpuhw->qsi.dsdes; + RAWSAMPLE_REG(hwc) = (unsigned long) sfr; /* Calculate sampling buffers using 4K pages * - * 1. Use frequency as input. The samping buffer is designed for - * a complete second. This can be adjusted through the "factor" - * variable. + * 1. Determine the sample data size which depends on the used + * sampling functions, for example, basic-sampling or + * basic-sampling with diagnostic-sampling. + * + * 2. Use the sampling frequency as input. The sampling buffer is + * designed for almost one second. This can be adjusted through + * the "factor" variable. * In any case, alloc_sampling_buffer() sets the Alert Request - * Control indicator to trigger measurement-alert to harvest + * Control indicator to trigger a measurement-alert to harvest * sample-data-blocks (sdb). * - * 2. Compute the number of sample-data-blocks and ensure a minimum + * 3. Compute the number of sample-data-blocks and ensure a minimum * of CPUM_SF_MIN_SDB. Also ensure the upper limit does not - * exceed CPUM_SF_MAX_SDB. See also the remarks for these - * symbolic constants. + * exceed a "calculated" maximum. The symbolic maximum is + * designed for basic-sampling only and needs to be increased if + * diagnostic-sampling is active. + * See also the remarks for these symbolic constants. * - * 3. Compute number of pages used for the sample-data-block-table - * and ensure a minimum of CPUM_SF_MIN_SDBT (at minimum one table - * to manage up to 511 sample-data-blocks). + * 4. Compute the number of sample-data-block-tables (SDBT) and + * ensure a minimum of CPUM_SF_MIN_SDBT (one table can manage up + * to 511 SDBs). */ + sample_size = event_sample_size(hwc); freq = sample_rate_to_freq(&cpuhw->qsi, SAMPL_RATE(hwc)); factor = 1; - n_sdb = DIV_ROUND_UP(freq, factor * ((PAGE_SIZE-64) / cpuhw->qsi.bsdes)); + n_sdb = DIV_ROUND_UP(freq, factor * ((PAGE_SIZE-64) / sample_size)); if (n_sdb < CPUM_SF_MIN_SDB) n_sdb = CPUM_SF_MIN_SDB; @@ -366,8 +440,10 @@ static int allocate_sdbt(struct cpu_hw_sf *cpuhw, struct hw_perf_event *hwc) return 0; debug_sprintf_event(sfdbg, 3, - "allocate_sdbt: rate=%lu f=%lu sdb=%lu/%lu cpuhw=%p\n", - SAMPL_RATE(hwc), freq, n_sdb, CPUM_SF_MAX_SDB, cpuhw); + "allocate_buffers: rate=%lu f=%lu sdb=%lu/%lu" + " sample_size=%lu cpuhw=%p\n", + SAMPL_RATE(hwc), freq, n_sdb, sfb_max_limit(hwc), + sample_size, cpuhw); return alloc_sampling_buffer(&cpuhw->sfb, sfb_pending_allocs(&cpuhw->sfb, hwc)); @@ -509,10 +585,8 @@ static void setup_pmc_cpu(void *flags) if (err) { pr_err("Switching off the sampling facility failed " "with rc=%i\n", err); - } else { - if (cpusf->sfb.sdbt) - free_sampling_buffer(&cpusf->sfb); - } + } else + deallocate_buffers(cpusf); debug_sprintf_event(sfdbg, 5, "setup_pmc_cpu: released: cpuhw=%p\n", cpusf); break; @@ -550,6 +624,10 @@ static int reserve_pmc_hardware(void) static void hw_perf_event_destroy(struct perf_event *event) { + /* Free raw sample buffer */ + if (RAWSAMPLE_REG(&event->hw)) + kfree((void *) RAWSAMPLE_REG(&event->hw)); + /* Release PMC if this is the last perf event */ if (!atomic_add_unless(&num_events, -1, 1)) { mutex_lock(&pmc_reserve_mutex); @@ -569,8 +647,15 @@ static void hw_init_period(struct hw_perf_event *hwc, u64 period) static void hw_reset_registers(struct hw_perf_event *hwc, unsigned long *sdbt_origin) { + struct sf_raw_sample *sfr; + /* (Re)set to first sample-data-block-table */ TEAR_REG(hwc) = (unsigned long) sdbt_origin; + + /* (Re)set raw sampling buffer register */ + sfr = (struct sf_raw_sample *) RAWSAMPLE_REG(hwc); + memset(&sfr->basic, 0, sizeof(sfr->basic)); + memset(&sfr->diag, 0, sfr->dsdes); } static unsigned long hw_limit_rate(const struct hws_qsi_info_block *si, @@ -634,6 +719,20 @@ static int __hw_perf_event_init(struct perf_event *event) goto out; } + /* Always enable basic sampling */ + SAMPL_FLAGS(hwc) = PERF_CPUM_SF_BASIC_MODE; + + /* Check if diagnostic sampling is requested. Deny if the required + * sampling authorization is missing. + */ + if (attr->config == PERF_EVENT_CPUM_SF_DIAG) { + if (!si.ad) { + err = -EPERM; + goto out; + } + SAMPL_FLAGS(hwc) |= PERF_CPUM_SF_DIAG_MODE; + } + /* The sampling information (si) contains information about the * min/max sampling intervals and the CPU speed. So calculate the * correct sampling interval and avoid the whole period adjust @@ -679,14 +778,14 @@ static int __hw_perf_event_init(struct perf_event *event) */ if (cpuhw) /* Event is pinned to a particular CPU */ - err = allocate_sdbt(cpuhw, hwc); + err = allocate_buffers(cpuhw, hwc); else { /* Event is not pinned, allocate sampling buffer on * each online CPU */ for_each_online_cpu(cpu) { cpuhw = &per_cpu(cpu_hw_sf, cpu); - err = allocate_sdbt(cpuhw, hwc); + err = allocate_buffers(cpuhw, hwc); if (err) break; } @@ -705,7 +804,8 @@ static int cpumsf_pmu_event_init(struct perf_event *event) switch (event->attr.type) { case PERF_TYPE_RAW: - if (event->attr.config != PERF_EVENT_CPUM_SF) + if ((event->attr.config != PERF_EVENT_CPUM_SF) && + (event->attr.config != PERF_EVENT_CPUM_SF_DIAG)) return -ENOENT; break; case PERF_TYPE_HARDWARE: @@ -786,8 +886,9 @@ static void cpumsf_pmu_enable(struct pmu *pmu) return; } - debug_sprintf_event(sfdbg, 6, "pmu_enable: es=%i cs=%i tear=%p dear=%p\n", - cpuhw->lsctl.es, cpuhw->lsctl.cs, + debug_sprintf_event(sfdbg, 6, "pmu_enable: es=%i cs=%i ed=%i cd=%i " + "tear=%p dear=%p\n", cpuhw->lsctl.es, cpuhw->lsctl.cs, + cpuhw->lsctl.ed, cpuhw->lsctl.cd, (void *) cpuhw->lsctl.tear, (void *) cpuhw->lsctl.dear); } @@ -807,6 +908,7 @@ static void cpumsf_pmu_disable(struct pmu *pmu) /* Switch off sampling activation control */ inactive = cpuhw->lsctl; inactive.cs = 0; + inactive.cd = 0; err = lsctl(&inactive); if (err) { @@ -867,21 +969,19 @@ static int perf_exclude_event(struct perf_event *event, struct pt_regs *regs, * * Return non-zero if an event overflow occurred. */ -static int perf_push_sample(struct perf_event *event, - struct hws_data_entry *sample) +static int perf_push_sample(struct perf_event *event, struct sf_raw_sample *sfr) { int overflow; struct pt_regs regs; struct perf_sf_sde_regs *sde_regs; struct perf_sample_data data; + struct perf_raw_record raw; - /* Skip samples that are invalid or for which the instruction address - * is not predictable. For the latter, the wait-state bit is set. - */ - if (sample->I || sample->W) - return 0; - + /* Setup perf sample */ perf_sample_data_init(&data, 0, event->hw.last_period); + raw.size = sfr->size; + raw.data = sfr; + data.raw = &raw; /* Setup pt_regs to look like an CPU-measurement external interrupt * using the Program Request Alert code. The regs.int_parm_long @@ -893,14 +993,14 @@ static int perf_push_sample(struct perf_event *event, regs.int_parm = CPU_MF_INT_SF_PRA; sde_regs = (struct perf_sf_sde_regs *) ®s.int_parm_long; - regs.psw.addr = sample->ia; - if (sample->T) + regs.psw.addr = sfr->basic.ia; + if (sfr->basic.T) regs.psw.mask |= PSW_MASK_DAT; - if (sample->W) + if (sfr->basic.W) regs.psw.mask |= PSW_MASK_WAIT; - if (sample->P) + if (sfr->basic.P) regs.psw.mask |= PSW_MASK_PSTATE; - switch (sample->AS) { + switch (sfr->basic.AS) { case 0x0: regs.psw.mask |= PSW_ASC_PRIMARY; break; @@ -922,7 +1022,7 @@ static int perf_push_sample(struct perf_event *event, * purposes too. * For now, simply use a non-zero value as guest indicator. */ - if (sample->hpp) + if (sfr->basic.hpp) sde_regs->in_guest = 1; overflow = 0; @@ -942,51 +1042,155 @@ static void perf_event_count_update(struct perf_event *event, u64 count) local64_add(count, &event->count); } +static int sample_format_is_valid(struct hws_combined_entry *sample, + unsigned int flags) +{ + if (likely(flags & PERF_CPUM_SF_BASIC_MODE)) + /* Only basic-sampling data entries with data-entry-format + * version of 0x0001 can be processed. + */ + if (sample->basic.def != 0x0001) + return 0; + if (flags & PERF_CPUM_SF_DIAG_MODE) + /* The data-entry-format number of diagnostic-sampling data + * entries can vary. Because diagnostic data is just passed + * through, do only a sanity check on the DEF. + */ + if (sample->diag.def < 0x8001) + return 0; + return 1; +} + +static int sample_is_consistent(struct hws_combined_entry *sample, + unsigned long flags) +{ + /* This check applies only to basic-sampling data entries of potentially + * combined-sampling data entries. Invalid entries cannot be processed + * by the PMU and, thus, do not deliver an associated + * diagnostic-sampling data entry. + */ + if (unlikely(!(flags & PERF_CPUM_SF_BASIC_MODE))) + return 0; + /* + * Samples are skipped, if they are invalid or for which the + * instruction address is not predictable, i.e., the wait-state bit is + * set. + */ + if (sample->basic.I || sample->basic.W) + return 0; + return 1; +} + +static void reset_sample_slot(struct hws_combined_entry *sample, + unsigned long flags) +{ + if (likely(flags & PERF_CPUM_SF_BASIC_MODE)) + sample->basic.def = 0; + if (flags & PERF_CPUM_SF_DIAG_MODE) + sample->diag.def = 0; +} + +static void sfr_store_sample(struct sf_raw_sample *sfr, + struct hws_combined_entry *sample) +{ + if (likely(sfr->format & PERF_CPUM_SF_BASIC_MODE)) + sfr->basic = sample->basic; + if (sfr->format & PERF_CPUM_SF_DIAG_MODE) + memcpy(&sfr->diag, &sample->diag, sfr->dsdes); +} + +static void debug_sample_entry(struct hws_combined_entry *sample, + struct hws_trailer_entry *te, + unsigned long flags) +{ + debug_sprintf_event(sfdbg, 4, "hw_collect_samples: Found unknown " + "sampling data entry: te->f=%i basic.def=%04x (%p)" + " diag.def=%04x (%p)\n", te->f, + sample->basic.def, &sample->basic, + (flags & PERF_CPUM_SF_DIAG_MODE) + ? sample->diag.def : 0xFFFF, + (flags & PERF_CPUM_SF_DIAG_MODE) + ? &sample->diag : NULL); +} + /* hw_collect_samples() - Walk through a sample-data-block and collect samples * @event: The perf event * @sdbt: Sample-data-block table * @overflow: Event overflow counter * - * Walks through a sample-data-block and collects hardware sample-data that is - * pushed to the perf event subsystem. The overflow reports the number of - * samples that has been discarded due to an event overflow. + * Walks through a sample-data-block and collects sampling data entries that are + * then pushed to the perf event subsystem. Depending on the sampling function, + * there can be either basic-sampling or combined-sampling data entries. A + * combined-sampling data entry consists of a basic- and a diagnostic-sampling + * data entry. The sampling function is determined by the flags in the perf + * event hardware structure. The function always works with a combined-sampling + * data entry but ignores the the diagnostic portion if it is not available. + * + * Note that the implementation focuses on basic-sampling data entries and, if + * such an entry is not valid, the entire combined-sampling data entry is + * ignored. + * + * The overflow variables counts the number of samples that has been discarded + * due to a perf event overflow. */ static void hw_collect_samples(struct perf_event *event, unsigned long *sdbt, unsigned long long *overflow) { - struct hws_data_entry *sample; - unsigned long *trailer; + unsigned long flags = SAMPL_FLAGS(&event->hw); + struct hws_combined_entry *sample; + struct hws_trailer_entry *te; + struct sf_raw_sample *sfr; + size_t sample_size; + + /* Prepare and initialize raw sample data */ + sfr = (struct sf_raw_sample *) RAWSAMPLE_REG(&event->hw); + sfr->format = flags & PERF_CPUM_SF_MODE_MASK; - trailer = trailer_entry_ptr(*sdbt); - sample = (struct hws_data_entry *) *sdbt; - while ((unsigned long *) sample < trailer) { + sample_size = event_sample_size(&event->hw); + te = (struct hws_trailer_entry *) trailer_entry_ptr(*sdbt); + sample = (struct hws_combined_entry *) *sdbt; + while ((unsigned long *) sample < (unsigned long *) te) { /* Check for an empty sample */ - if (!sample->def) + if (!sample->basic.def) break; /* Update perf event period */ perf_event_count_update(event, SAMPL_RATE(&event->hw)); - /* Check for basic sampling mode */ - if (sample->def == 0x0001) { + /* Check sampling data entry */ + if (sample_format_is_valid(sample, flags)) { /* If an event overflow occurred, the PMU is stopped to * throttle event delivery. Remaining sample data is * discarded. */ - if (!*overflow) - *overflow = perf_push_sample(event, sample); - else + if (!*overflow) { + if (sample_is_consistent(sample, flags)) { + /* Deliver sample data to perf */ + sfr_store_sample(sfr, sample); + *overflow = perf_push_sample(event, sfr); + } + } else /* Count discarded samples */ *overflow += 1; - } else - /* Sample slot is not yet written or other record */ - debug_sprintf_event(sfdbg, 5, "hw_collect_samples: " - "Unknown sample data entry format:" - " %i\n", sample->def); + } else { + debug_sample_entry(sample, te, flags); + /* Sample slot is not yet written or other record. + * + * This condition can occur if the buffer was reused + * from a combined basic- and diagnostic-sampling. + * If only basic-sampling is then active, entries are + * written into the larger diagnostic entries. + * This is typically the case for sample-data-blocks + * that are not full. Stop processing if the first + * invalid format was detected. + */ + if (!te->f) + break; + } /* Reset sample slot and advance to next sample */ - sample->def = 0; - sample++; + reset_sample_slot(sample, flags); + sample += sample_size; } } @@ -1104,6 +1308,8 @@ static void cpumsf_pmu_start(struct perf_event *event, int flags) perf_pmu_disable(event->pmu); event->hw.state = 0; cpuhw->lsctl.cs = 1; + if (SAMPL_DIAG_MODE(&event->hw)) + cpuhw->lsctl.cd = 1; perf_pmu_enable(event->pmu); } @@ -1119,6 +1325,7 @@ static void cpumsf_pmu_stop(struct perf_event *event, int flags) perf_pmu_disable(event->pmu); cpuhw->lsctl.cs = 0; + cpuhw->lsctl.cd = 0; event->hw.state |= PERF_HES_STOPPED; if ((flags & PERF_EF_UPDATE) && !(event->hw.state & PERF_HES_UPTODATE)) { @@ -1158,11 +1365,13 @@ static int cpumsf_pmu_add(struct perf_event *event, int flags) /* Ensure sampling functions are in the disabled state. If disabled, * switch on sampling enable control. */ - if (WARN_ON_ONCE(cpuhw->lsctl.es == 1)) { + if (WARN_ON_ONCE(cpuhw->lsctl.es == 1 || cpuhw->lsctl.ed == 1)) { err = -EAGAIN; goto out; } cpuhw->lsctl.es = 1; + if (SAMPL_DIAG_MODE(&event->hw)) + cpuhw->lsctl.ed = 1; /* Set in_use flag and store event */ event->hw.idx = 0; /* only one sampling event per CPU supported */ @@ -1185,6 +1394,7 @@ static void cpumsf_pmu_del(struct perf_event *event, int flags) cpumsf_pmu_stop(event, PERF_EF_UPDATE); cpuhw->lsctl.es = 0; + cpuhw->lsctl.ed = 0; cpuhw->flags &= ~PMU_F_IN_USE; cpuhw->event = NULL; @@ -1198,9 +1408,11 @@ static int cpumsf_pmu_event_idx(struct perf_event *event) } CPUMF_EVENT_ATTR(SF, SF_CYCLES_BASIC, PERF_EVENT_CPUM_SF); +CPUMF_EVENT_ATTR(SF, SF_CYCLES_BASIC_DIAG, PERF_EVENT_CPUM_SF_DIAG); static struct attribute *cpumsf_pmu_events_attr[] = { CPUMF_EVENT_PTR(SF, SF_CYCLES_BASIC), + CPUMF_EVENT_PTR(SF, SF_CYCLES_BASIC_DIAG), NULL, }; @@ -1351,8 +1563,9 @@ static int param_set_sfb_size(const char *val, const struct kernel_param *kp) return rc; sfb_set_limits(min, max); - pr_info("Changed sampling buffer settings: min=%lu max=%lu\n", - CPUM_SF_MIN_SDB, CPUM_SF_MAX_SDB); + pr_info("The sampling buffer limits have changed to: " + "min=%lu max=%lu (diag=x%lu)\n", + CPUM_SF_MIN_SDB, CPUM_SF_MAX_SDB, CPUM_SF_SDB_DIAG_FACTOR); return 0; } @@ -1362,13 +1575,38 @@ static struct kernel_param_ops param_ops_sfb_size = { .get = param_get_sfb_size, }; +#define RS_INIT_FAILURE_QSI 0x0001 +#define RS_INIT_FAILURE_BSDES 0x0002 +#define RS_INIT_FAILURE_ALRT 0x0003 +#define RS_INIT_FAILURE_PERF 0x0004 +static void __init pr_cpumsf_err(unsigned int reason) +{ + pr_err("Sampling facility support for perf is not available: " + "reason=%04x\n", reason); +} + static int __init init_cpum_sampling_pmu(void) { + struct hws_qsi_info_block si; int err; if (!cpum_sf_avail()) return -ENODEV; + memset(&si, 0, sizeof(si)); + if (qsi(&si)) { + pr_cpumsf_err(RS_INIT_FAILURE_QSI); + return -ENODEV; + } + + if (si.bsdes != sizeof(struct hws_basic_entry)) { + pr_cpumsf_err(RS_INIT_FAILURE_BSDES); + return -EINVAL; + } + + if (si.ad) + sfb_set_limits(CPUM_SF_MIN_SDB, CPUM_SF_MAX_SDB); + sfdbg = debug_register(KMSG_COMPONENT, 2, 1, 80); if (!sfdbg) pr_err("Registering for s390dbf failed\n"); @@ -1376,13 +1614,13 @@ static int __init init_cpum_sampling_pmu(void) err = register_external_interrupt(0x1407, cpumf_measurement_alert); if (err) { - pr_err("Failed to register for CPU-measurement alerts\n"); + pr_cpumsf_err(RS_INIT_FAILURE_ALRT); goto out; } err = perf_pmu_register(&cpumf_sampling, "cpum_sf", PERF_TYPE_RAW); if (err) { - pr_err("Failed to register cpum_sf pmu\n"); + pr_cpumsf_err(RS_INIT_FAILURE_PERF); unregister_external_interrupt(0x1407, cpumf_measurement_alert); goto out; } diff --git a/arch/s390/kernel/perf_event.c b/arch/s390/kernel/perf_event.c index 60a68261d091..91aa215f947f 100644 --- a/arch/s390/kernel/perf_event.c +++ b/arch/s390/kernel/perf_event.c @@ -139,16 +139,21 @@ static void print_debug_sf(void) int cpu = smp_processor_id(); memset(&si, 0, sizeof(si)); - if (qsi(&si)) { - pr_err("CPU[%i]: CPM_SF: qsi failed\n"); + if (qsi(&si)) return; - } - pr_info("CPU[%i]: CPM_SF: as=%i es=%i cs=%i bsdes=%i dsdes=%i" - " min=%i max=%i cpu_speed=%i tear=%p dear=%p\n", - cpu, si.as, si.es, si.cs, si.bsdes, si.dsdes, - si.min_sampl_rate, si.max_sampl_rate, si.cpu_speed, - si.tear, si.dear); + pr_info("CPU[%i] CPUM_SF: basic=%i diag=%i min=%i max=%i cpu_speed=%i\n", + cpu, si.as, si.ad, si.min_sampl_rate, si.max_sampl_rate, + si.cpu_speed); + + if (si.as) + pr_info("CPU[%i] CPUM_SF: Basic-sampling: a=%i e=%i c=%i" + " bsdes=%i tear=%p dear=%p\n", cpu, + si.as, si.es, si.cs, si.bsdes, si.tear, si.dear); + if (si.ad) + pr_info("CPU[%i] CPUM_SF: Diagnostic-sampling: a=%i e=%i c=%i" + " dsdes=%i tear=%p dear=%p\n", cpu, + si.ad, si.ed, si.cd, si.dsdes, si.tear, si.dear); } void perf_event_print_debug(void) diff --git a/arch/s390/oprofile/hwsampler.c b/arch/s390/oprofile/hwsampler.c index eb095874540d..a32c96761eab 100644 --- a/arch/s390/oprofile/hwsampler.c +++ b/arch/s390/oprofile/hwsampler.c @@ -799,7 +799,7 @@ static void worker_on_interrupt(unsigned int cpu) static void add_samples_to_oprofile(unsigned int cpu, unsigned long *sdbt, unsigned long *dear) { - struct hws_data_entry *sample_data_ptr; + struct hws_basic_entry *sample_data_ptr; unsigned long *trailer; trailer = trailer_entry_ptr(*sdbt); @@ -809,7 +809,7 @@ static void add_samples_to_oprofile(unsigned int cpu, unsigned long *sdbt, trailer = dear; } - sample_data_ptr = (struct hws_data_entry *)(*sdbt); + sample_data_ptr = (struct hws_basic_entry *)(*sdbt); while ((unsigned long *)sample_data_ptr < trailer) { struct pt_regs *regs = NULL;