diff options
Diffstat (limited to 'arch/s390/kernel/perf_cpum_cf_diag.c')
| -rw-r--r-- | arch/s390/kernel/perf_cpum_cf_diag.c | 693 |
1 files changed, 693 insertions, 0 deletions
diff --git a/arch/s390/kernel/perf_cpum_cf_diag.c b/arch/s390/kernel/perf_cpum_cf_diag.c new file mode 100644 index 000000000000..c6fad208c2fa --- /dev/null +++ b/arch/s390/kernel/perf_cpum_cf_diag.c @@ -0,0 +1,693 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Performance event support for s390x - CPU-measurement Counter Sets + * + * Copyright IBM Corp. 2019 + * Author(s): Hendrik Brueckner <brueckner@linux.ibm.com> + * Thomas Richer <tmricht@linux.ibm.com> + */ +#define KMSG_COMPONENT "cpum_cf_diag" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include <linux/kernel.h> +#include <linux/kernel_stat.h> +#include <linux/percpu.h> +#include <linux/notifier.h> +#include <linux/init.h> +#include <linux/export.h> +#include <linux/slab.h> +#include <linux/processor.h> + +#include <asm/ctl_reg.h> +#include <asm/irq.h> +#include <asm/cpu_mcf.h> +#include <asm/timex.h> +#include <asm/debug.h> + +#define CF_DIAG_CTRSET_DEF 0xfeef /* Counter set header mark */ + +static unsigned int cf_diag_cpu_speed; +static debug_info_t *cf_diag_dbg; + +struct cf_diag_csd { /* Counter set data per CPU */ + size_t used; /* Bytes used in data/start */ + unsigned char start[PAGE_SIZE]; /* Counter set at event start */ + unsigned char data[PAGE_SIZE]; /* Counter set at event delete */ +}; +DEFINE_PER_CPU(struct cf_diag_csd, cf_diag_csd); + +/* Counter sets are stored as data stream in a page sized memory buffer and + * exported to user space via raw data attached to the event sample data. + * Each counter set starts with an eight byte header consisting of: + * - a two byte eye catcher (0xfeef) + * - a one byte counter set number + * - a two byte counter set size (indicates the number of counters in this set) + * - a three byte reserved value (must be zero) to make the header the same + * size as a counter value. + * All counter values are eight byte in size. + * + * All counter sets are followed by a 64 byte trailer. + * The trailer consists of a: + * - flag field indicating valid fields when corresponding bit set + * - the counter facility first and second version number + * - the CPU speed if nonzero + * - the time stamp the counter sets have been collected + * - the time of day (TOD) base value + * - the machine type. + * + * The counter sets are saved when the process is prepared to be executed on a + * CPU and saved again when the process is going to be removed from a CPU. + * The difference of both counter sets are calculated and stored in the event + * sample data area. + */ + +struct cf_ctrset_entry { /* CPU-M CF counter set entry (8 byte) */ + unsigned int def:16; /* 0-15 Data Entry Format */ + unsigned int set:16; /* 16-31 Counter set identifier */ + unsigned int ctr:16; /* 32-47 Number of stored counters */ + unsigned int res1:16; /* 48-63 Reserved */ +}; + +struct cf_trailer_entry { /* CPU-M CF_DIAG trailer (64 byte) */ + /* 0 - 7 */ + union { + struct { + unsigned int clock_base:1; /* TOD clock base set */ + unsigned int speed:1; /* CPU speed set */ + /* Measurement alerts */ + unsigned int mtda:1; /* Loss of MT ctr. data alert */ + unsigned int caca:1; /* Counter auth. change alert */ + unsigned int lcda:1; /* Loss of counter data alert */ + }; + unsigned long flags; /* 0-63 All indicators */ + }; + /* 8 - 15 */ + unsigned int cfvn:16; /* 64-79 Ctr First Version */ + unsigned int csvn:16; /* 80-95 Ctr Second Version */ + unsigned int cpu_speed:32; /* 96-127 CPU speed */ + /* 16 - 23 */ + unsigned long timestamp; /* 128-191 Timestamp (TOD) */ + /* 24 - 55 */ + union { + struct { + unsigned long progusage1; + unsigned long progusage2; + unsigned long progusage3; + unsigned long tod_base; + }; + unsigned long progusage[4]; + }; + /* 56 - 63 */ + unsigned int mach_type:16; /* Machine type */ + unsigned int res1:16; /* Reserved */ + unsigned int res2:32; /* Reserved */ +}; + +/* Create the trailer data at the end of a page. */ +static void cf_diag_trailer(struct cf_trailer_entry *te) +{ + struct cpu_cf_events *cpuhw = this_cpu_ptr(&cpu_cf_events); + struct cpuid cpuid; + + te->cfvn = cpuhw->info.cfvn; /* Counter version numbers */ + te->csvn = cpuhw->info.csvn; + + get_cpu_id(&cpuid); /* Machine type */ + te->mach_type = cpuid.machine; + te->cpu_speed = cf_diag_cpu_speed; + if (te->cpu_speed) + te->speed = 1; + te->clock_base = 1; /* Save clock base */ + memcpy(&te->tod_base, &tod_clock_base[1], 8); + store_tod_clock((__u64 *)&te->timestamp); +} + +/* + * Change the CPUMF state to active. + * Enable and activate the CPU-counter sets according + * to the per-cpu control state. + */ +static void cf_diag_enable(struct pmu *pmu) +{ + struct cpu_cf_events *cpuhw = this_cpu_ptr(&cpu_cf_events); + int err; + + debug_sprintf_event(cf_diag_dbg, 5, + "%s pmu %p cpu %d flags %#x state %#llx\n", + __func__, pmu, smp_processor_id(), cpuhw->flags, + cpuhw->state); + if (cpuhw->flags & PMU_F_ENABLED) + return; + + err = lcctl(cpuhw->state); + if (err) { + pr_err("Enabling the performance measuring unit " + "failed with rc=%x\n", err); + return; + } + cpuhw->flags |= PMU_F_ENABLED; +} + +/* + * Change the CPUMF state to inactive. + * Disable and enable (inactive) the CPU-counter sets according + * to the per-cpu control state. + */ +static void cf_diag_disable(struct pmu *pmu) +{ + struct cpu_cf_events *cpuhw = this_cpu_ptr(&cpu_cf_events); + u64 inactive; + int err; + + debug_sprintf_event(cf_diag_dbg, 5, + "%s pmu %p cpu %d flags %#x state %#llx\n", + __func__, pmu, smp_processor_id(), cpuhw->flags, + cpuhw->state); + if (!(cpuhw->flags & PMU_F_ENABLED)) + return; + + inactive = cpuhw->state & ~((1 << CPUMF_LCCTL_ENABLE_SHIFT) - 1); + err = lcctl(inactive); + if (err) { + pr_err("Disabling the performance measuring unit " + "failed with rc=%x\n", err); + return; + } + cpuhw->flags &= ~PMU_F_ENABLED; +} + +/* Number of perf events counting hardware events */ +static atomic_t cf_diag_events = ATOMIC_INIT(0); + +/* Release the PMU if event is the last perf event */ +static void cf_diag_perf_event_destroy(struct perf_event *event) +{ + debug_sprintf_event(cf_diag_dbg, 5, + "%s event %p cpu %d cf_diag_events %d\n", + __func__, event, event->cpu, + atomic_read(&cf_diag_events)); + if (atomic_dec_return(&cf_diag_events) == 0) + __kernel_cpumcf_end(); +} + +/* Setup the event. Test for authorized counter sets and only include counter + * sets which are authorized at the time of the setup. Including unauthorized + * counter sets result in specification exception (and panic). + */ +static int __hw_perf_event_init(struct perf_event *event) +{ + struct cpu_cf_events *cpuhw = this_cpu_ptr(&cpu_cf_events); + struct perf_event_attr *attr = &event->attr; + enum cpumf_ctr_set i; + int err = 0; + + debug_sprintf_event(cf_diag_dbg, 5, + "%s event %p cpu %d authorized %#x\n", __func__, + event, event->cpu, cpuhw->info.auth_ctl); + + event->hw.config = attr->config; + event->hw.config_base = 0; + local64_set(&event->count, 0); + + /* Add all authorized counter sets to config_base */ + for (i = CPUMF_CTR_SET_BASIC; i < CPUMF_CTR_SET_MAX; ++i) + if (cpuhw->info.auth_ctl & cpumf_ctr_ctl[i]) + event->hw.config_base |= cpumf_ctr_ctl[i]; + + /* No authorized counter sets, nothing to count/sample */ + if (!event->hw.config_base) { + err = -EINVAL; + goto out; + } + + /* Set sample_period to indicate sampling */ + event->hw.sample_period = attr->sample_period; + local64_set(&event->hw.period_left, event->hw.sample_period); + event->hw.last_period = event->hw.sample_period; +out: + debug_sprintf_event(cf_diag_dbg, 5, "%s err %d config_base %#lx\n", + __func__, err, event->hw.config_base); + return err; +} + +static int cf_diag_event_init(struct perf_event *event) +{ + struct perf_event_attr *attr = &event->attr; + int err = -ENOENT; + + debug_sprintf_event(cf_diag_dbg, 5, + "%s event %p cpu %d config %#llx " + "sample_type %#llx cf_diag_events %d\n", __func__, + event, event->cpu, attr->config, attr->sample_type, + atomic_read(&cf_diag_events)); + + if (event->attr.config != PERF_EVENT_CPUM_CF_DIAG || + event->attr.type != PERF_TYPE_RAW) + goto out; + + /* Raw events are used to access counters directly, + * hence do not permit excludes. + * This event is usesless without PERF_SAMPLE_RAW to return counter set + * values as raw data. + */ + if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv || + !(attr->sample_type & (PERF_SAMPLE_CPU | PERF_SAMPLE_RAW))) { + err = -EOPNOTSUPP; + goto out; + } + + /* Initialize for using the CPU-measurement counter facility */ + if (atomic_inc_return(&cf_diag_events) == 1) { + if (__kernel_cpumcf_begin()) { + atomic_dec(&cf_diag_events); + err = -EBUSY; + goto out; + } + } + event->destroy = cf_diag_perf_event_destroy; + + err = __hw_perf_event_init(event); + if (unlikely(err)) + event->destroy(event); +out: + debug_sprintf_event(cf_diag_dbg, 5, "%s err %d\n", __func__, err); + return err; +} + +static void cf_diag_read(struct perf_event *event) +{ + debug_sprintf_event(cf_diag_dbg, 5, "%s event %p\n", __func__, event); +} + +/* Return the maximum possible counter set size (in number of 8 byte counters) + * depending on type and model number. + */ +static size_t cf_diag_ctrset_size(enum cpumf_ctr_set ctrset, + struct cpumf_ctr_info *info) +{ + size_t ctrset_size = 0; + + switch (ctrset) { + case CPUMF_CTR_SET_BASIC: + if (info->cfvn >= 1) + ctrset_size = 6; + break; + case CPUMF_CTR_SET_USER: + if (info->cfvn == 1) + ctrset_size = 6; + else if (info->cfvn >= 3) + ctrset_size = 2; + break; + case CPUMF_CTR_SET_CRYPTO: + ctrset_size = 16; + break; + case CPUMF_CTR_SET_EXT: + if (info->csvn == 1) + ctrset_size = 32; + else if (info->csvn == 2) + ctrset_size = 48; + else if (info->csvn >= 3) + ctrset_size = 128; + break; + case CPUMF_CTR_SET_MT_DIAG: + if (info->csvn > 3) + ctrset_size = 48; + break; + case CPUMF_CTR_SET_MAX: + break; + } + + return ctrset_size; +} + +/* Calculate memory needed to store all counter sets together with header and + * trailer data. This is independend of the counter set authorization which + * can vary depending on the configuration. + */ +static size_t cf_diag_ctrset_maxsize(struct cpumf_ctr_info *info) +{ + size_t max_size = sizeof(struct cf_trailer_entry); + enum cpumf_ctr_set i; + + for (i = CPUMF_CTR_SET_BASIC; i < CPUMF_CTR_SET_MAX; ++i) { + size_t size = cf_diag_ctrset_size(i, info); + + if (size) + max_size += size * sizeof(u64) + + sizeof(struct cf_ctrset_entry); + } + debug_sprintf_event(cf_diag_dbg, 5, "%s max_size %zu\n", __func__, + max_size); + + return max_size; +} + +/* Read a counter set. The counter set number determines which counter set and + * the CPUM-CF first and second version number determine the number of + * available counters in this counter set. + * Each counter set starts with header containing the counter set number and + * the number of 8 byte counters. + * + * The functions returns the number of bytes occupied by this counter set + * including the header. + * If there is no counter in the counter set, this counter set is useless and + * zero is returned on this case. + */ +static size_t cf_diag_getctrset(struct cf_ctrset_entry *ctrdata, int ctrset, + size_t room) +{ + struct cpu_cf_events *cpuhw = this_cpu_ptr(&cpu_cf_events); + size_t ctrset_size, need = 0; + int rc = 3; /* Assume write failure */ + + ctrdata->def = CF_DIAG_CTRSET_DEF; + ctrdata->set = ctrset; + ctrdata->res1 = 0; + ctrset_size = cf_diag_ctrset_size(ctrset, &cpuhw->info); + + if (ctrset_size) { /* Save data */ + need = ctrset_size * sizeof(u64) + sizeof(*ctrdata); + if (need <= room) + rc = ctr_stcctm(ctrset, ctrset_size, + (u64 *)(ctrdata + 1)); + if (rc != 3) + ctrdata->ctr = ctrset_size; + else + need = 0; + } + + debug_sprintf_event(cf_diag_dbg, 6, + "%s ctrset %d ctrset_size %zu cfvn %d csvn %d" + " need %zd rc:%d\n", + __func__, ctrset, ctrset_size, cpuhw->info.cfvn, + cpuhw->info.csvn, need, rc); + return need; +} + +/* Read out all counter sets and save them in the provided data buffer. + * The last 64 byte host an artificial trailer entry. + */ +static size_t cf_diag_getctr(void *data, size_t sz, unsigned long auth) +{ + struct cf_trailer_entry *trailer; + size_t offset = 0, done; + int i; + + memset(data, 0, sz); + sz -= sizeof(*trailer); /* Always room for trailer */ + for (i = CPUMF_CTR_SET_BASIC; i < CPUMF_CTR_SET_MAX; ++i) { + struct cf_ctrset_entry *ctrdata = data + offset; + + if (!(auth & cpumf_ctr_ctl[i])) + continue; /* Counter set not authorized */ + + done = cf_diag_getctrset(ctrdata, i, sz - offset); + offset += done; + debug_sprintf_event(cf_diag_dbg, 6, + "%s ctrset %d offset %zu done %zu\n", + __func__, i, offset, done); + } + trailer = data + offset; + cf_diag_trailer(trailer); + return offset + sizeof(*trailer); +} + +/* Calculate the difference for each counter in a counter set. */ +static void cf_diag_diffctrset(u64 *pstart, u64 *pstop, int counters) +{ + for (; --counters >= 0; ++pstart, ++pstop) + if (*pstop >= *pstart) + *pstop -= *pstart; + else + *pstop = *pstart - *pstop; +} + +/* Scan the counter sets and calculate the difference of each counter + * in each set. The result is the increment of each counter during the + * period the counter set has been activated. + * + * Return true on success. + */ +static int cf_diag_diffctr(struct cf_diag_csd *csd, unsigned long auth) +{ + struct cf_trailer_entry *trailer_start, *trailer_stop; + struct cf_ctrset_entry *ctrstart, *ctrstop; + size_t offset = 0; + + auth &= (1 << CPUMF_LCCTL_ENABLE_SHIFT) - 1; + do { + ctrstart = (struct cf_ctrset_entry *)(csd->start + offset); + ctrstop = (struct cf_ctrset_entry *)(csd->data + offset); + + if (memcmp(ctrstop, ctrstart, sizeof(*ctrstop))) { + pr_err("cpum_cf_diag counter set compare error " + "in set %i\n", ctrstart->set); + return 0; + } + auth &= ~cpumf_ctr_ctl[ctrstart->set]; + if (ctrstart->def == CF_DIAG_CTRSET_DEF) { + cf_diag_diffctrset((u64 *)(ctrstart + 1), + (u64 *)(ctrstop + 1), ctrstart->ctr); + offset += ctrstart->ctr * sizeof(u64) + + sizeof(*ctrstart); + } + debug_sprintf_event(cf_diag_dbg, 6, + "%s set %d ctr %d offset %zu auth %lx\n", + __func__, ctrstart->set, ctrstart->ctr, + offset, auth); + } while (ctrstart->def && auth); + + /* Save time_stamp from start of event in stop's trailer */ + trailer_start = (struct cf_trailer_entry *)(csd->start + offset); + trailer_stop = (struct cf_trailer_entry *)(csd->data + offset); + trailer_stop->progusage[0] = trailer_start->timestamp; + + return 1; +} + +/* Create perf event sample with the counter sets as raw data. The sample + * is then pushed to the event subsystem and the function checks for + * possible event overflows. If an event overflow occurs, the PMU is + * stopped. + * + * Return non-zero if an event overflow occurred. + */ +static int cf_diag_push_sample(struct perf_event *event, + struct cf_diag_csd *csd) +{ + struct perf_sample_data data; + struct perf_raw_record raw; + struct pt_regs regs; + int overflow; + + /* Setup perf sample */ + perf_sample_data_init(&data, 0, event->hw.last_period); + memset(®s, 0, sizeof(regs)); + memset(&raw, 0, sizeof(raw)); + + if (event->attr.sample_type & PERF_SAMPLE_CPU) + data.cpu_entry.cpu = event->cpu; + if (event->attr.sample_type & PERF_SAMPLE_RAW) { + raw.frag.size = csd->used; + raw.frag.data = csd->data; + raw.size = csd->used; + data.raw = &raw; + } + + overflow = perf_event_overflow(event, &data, ®s); + debug_sprintf_event(cf_diag_dbg, 6, + "%s event %p cpu %d sample_type %#llx raw %d " + "ov %d\n", __func__, event, event->cpu, + event->attr.sample_type, raw.size, overflow); + if (overflow) + event->pmu->stop(event, 0); + + perf_event_update_userpage(event); + return overflow; +} + +static void cf_diag_start(struct perf_event *event, int flags) +{ + struct cpu_cf_events *cpuhw = this_cpu_ptr(&cpu_cf_events); + struct cf_diag_csd *csd = this_cpu_ptr(&cf_diag_csd); + struct hw_perf_event *hwc = &event->hw; + + debug_sprintf_event(cf_diag_dbg, 5, + "%s event %p cpu %d flags %#x hwc-state %#x\n", + __func__, event, event->cpu, flags, hwc->state); + if (WARN_ON_ONCE(!(hwc->state & PERF_HES_STOPPED))) + return; + + /* (Re-)enable and activate all counter sets */ + lcctl(0); /* Reset counter sets */ + hwc->state = 0; + ctr_set_multiple_enable(&cpuhw->state, hwc->config_base); + lcctl(cpuhw->state); /* Enable counter sets */ + csd->used = cf_diag_getctr(csd->start, sizeof(csd->start), + event->hw.config_base); + ctr_set_multiple_start(&cpuhw->state, hwc->config_base); + /* Function cf_diag_enable() starts the counter sets. */ +} + +static void cf_diag_stop(struct perf_event *event, int flags) +{ + struct cpu_cf_events *cpuhw = this_cpu_ptr(&cpu_cf_events); + struct cf_diag_csd *csd = this_cpu_ptr(&cf_diag_csd); + struct hw_perf_event *hwc = &event->hw; + + debug_sprintf_event(cf_diag_dbg, 5, + "%s event %p cpu %d flags %#x hwc-state %#x\n", + __func__, event, event->cpu, flags, hwc->state); + + /* Deactivate all counter sets */ + ctr_set_multiple_stop(&cpuhw->state, hwc->config_base); + local64_inc(&event->count); + csd->used = cf_diag_getctr(csd->data, sizeof(csd->data), + event->hw.config_base); + if (cf_diag_diffctr(csd, event->hw.config_base)) + cf_diag_push_sample(event, csd); + hwc->state |= PERF_HES_STOPPED; +} + +static int cf_diag_add(struct perf_event *event, int flags) +{ + struct cpu_cf_events *cpuhw = this_cpu_ptr(&cpu_cf_events); + int err = 0; + + debug_sprintf_event(cf_diag_dbg, 5, + "%s event %p cpu %d flags %#x cpuhw:%p\n", + __func__, event, event->cpu, flags, cpuhw); + + if (cpuhw->flags & PMU_F_IN_USE) { + err = -EAGAIN; + goto out; + } + + event->hw.state = PERF_HES_UPTODATE | PERF_HES_STOPPED; + + cpuhw->flags |= PMU_F_IN_USE; + if (flags & PERF_EF_START) + cf_diag_start(event, PERF_EF_RELOAD); +out: + debug_sprintf_event(cf_diag_dbg, 5, "%s err %d\n", __func__, err); + return err; +} + +static void cf_diag_del(struct perf_event *event, int flags) +{ + struct cpu_cf_events *cpuhw = this_cpu_ptr(&cpu_cf_events); + + debug_sprintf_event(cf_diag_dbg, 5, + "%s event %p cpu %d flags %#x\n", + __func__, event, event->cpu, flags); + + cf_diag_stop(event, PERF_EF_UPDATE); + ctr_set_multiple_stop(&cpuhw->state, event->hw.config_base); + ctr_set_multiple_disable(&cpuhw->state, event->hw.config_base); + cpuhw->flags &= ~PMU_F_IN_USE; +} + +CPUMF_EVENT_ATTR(CF_DIAG, CF_DIAG, PERF_EVENT_CPUM_CF_DIAG); + +static struct attribute *cf_diag_events_attr[] = { + CPUMF_EVENT_PTR(CF_DIAG, CF_DIAG), + NULL, +}; + +PMU_FORMAT_ATTR(event, "config:0-63"); + +static struct attribute *cf_diag_format_attr[] = { + &format_attr_event.attr, + NULL, +}; + +static struct attribute_group cf_diag_events_group = { + .name = "events", + .attrs = cf_diag_events_attr, +}; +static struct attribute_group cf_diag_format_group = { + .name = "format", + .attrs = cf_diag_format_attr, +}; +static const struct attribute_group *cf_diag_attr_groups[] = { + &cf_diag_events_group, + &cf_diag_format_group, + NULL, +}; + +/* Performance monitoring unit for s390x */ +static struct pmu cf_diag = { + .task_ctx_nr = perf_sw_context, + .pmu_enable = cf_diag_enable, + .pmu_disable = cf_diag_disable, + .event_init = cf_diag_event_init, + .add = cf_diag_add, + .del = cf_diag_del, + .start = cf_diag_start, + .stop = cf_diag_stop, + .read = cf_diag_read, + + .attr_groups = cf_diag_attr_groups +}; + +/* Get the CPU speed, try sampling facility first and CPU attributes second. */ +static void cf_diag_get_cpu_speed(void) +{ + if (cpum_sf_avail()) { /* Sampling facility first */ + struct hws_qsi_info_block si; + + memset(&si, 0, sizeof(si)); + if (!qsi(&si)) { + cf_diag_cpu_speed = si.cpu_speed; + return; + } + } + + if (test_facility(34)) { /* CPU speed extract static part */ + unsigned long mhz = __ecag(ECAG_CPU_ATTRIBUTE, 0); + + if (mhz != -1UL) + cf_diag_cpu_speed = mhz & 0xffffffff; + } +} + +/* Initialize the counter set PMU to generate complete counter set data as + * event raw data. This relies on the CPU Measurement Counter Facility device + * already being loaded and initialized. + */ +static int __init cf_diag_init(void) +{ + struct cpumf_ctr_info info; + size_t need; + int rc; + + if (!kernel_cpumcf_avail() || !stccm_avail() || qctri(&info)) + return -ENODEV; + cf_diag_get_cpu_speed(); + + /* Make sure the counter set data fits into predefined buffer. */ + need = cf_diag_ctrset_maxsize(&info); + if (need > sizeof(((struct cf_diag_csd *)0)->start)) { + pr_err("Insufficient memory for PMU(cpum_cf_diag) need=%zu\n", + need); + return -ENOMEM; + } + + /* Setup s390dbf facility */ + cf_diag_dbg = debug_register(KMSG_COMPONENT, 2, 1, 128); + if (!cf_diag_dbg) { + pr_err("Registration of s390dbf(cpum_cf_diag) failed\n"); + return -ENOMEM; + } + debug_register_view(cf_diag_dbg, &debug_sprintf_view); + + rc = perf_pmu_register(&cf_diag, "cpum_cf_diag", PERF_TYPE_RAW); + if (rc) { + debug_unregister_view(cf_diag_dbg, &debug_sprintf_view); + debug_unregister(cf_diag_dbg); + pr_err("Registration of PMU(cpum_cf_diag) failed with rc=%i\n", + rc); + } + return rc; +} +arch_initcall(cf_diag_init); |