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|
// 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 */
};
static 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 perf_event_attr *attr = &event->attr;
struct cpu_cf_events *cpuhw;
enum cpumf_ctr_set i;
int err = 0;
debug_sprintf_event(cf_diag_dbg, 5, "%s event %p cpu %d\n", __func__,
event, event->cpu);
event->hw.config = attr->config;
event->hw.config_base = 0;
/* Add all authorized counter sets to config_base. The
* the hardware init function is either called per-cpu or just once
* for all CPUS (event->cpu == -1). This depends on the whether
* counting is started for all CPUs or on a per workload base where
* the perf event moves from one CPU to another CPU.
* Checking the authorization on any CPU is fine as the hardware
* applies the same authorization settings to all CPUs.
*/
cpuhw = &get_cpu_var(cpu_cf_events);
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];
put_cpu_var(cpu_cf_events);
/* 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:
if (info->csvn >= 1 && info->csvn <= 5)
ctrset_size = 16;
else if (info->csvn == 6)
ctrset_size = 20;
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 && info->csvn <= 5)
ctrset_size = 128;
else if (info->csvn == 6)
ctrset_size = 160;
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);
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