--- /dev/null
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2023 Intel Corporation
+ */
+
+#include <drm/drm_drv.h>
+#include <drm/drm_managed.h>
+#include <drm/xe_drm.h>
+
+#include "regs/xe_gt_regs.h"
+#include "xe_device.h"
+#include "xe_gt_clock.h"
+#include "xe_mmio.h"
+
+static cpumask_t xe_pmu_cpumask;
+static unsigned int xe_pmu_target_cpu = -1;
+
+static unsigned int config_gt_id(const u64 config)
+{
+ return config >> __XE_PMU_GT_SHIFT;
+}
+
+static u64 config_counter(const u64 config)
+{
+ return config & ~(~0ULL << __XE_PMU_GT_SHIFT);
+}
+
+static void xe_pmu_event_destroy(struct perf_event *event)
+{
+ struct xe_device *xe =
+ container_of(event->pmu, typeof(*xe), pmu.base);
+
+ drm_WARN_ON(&xe->drm, event->parent);
+
+ drm_dev_put(&xe->drm);
+}
+
+static u64 __engine_group_busyness_read(struct xe_gt *gt, int sample_type)
+{
+ u64 val;
+
+ switch (sample_type) {
+ case __XE_SAMPLE_RENDER_GROUP_BUSY:
+ val = xe_mmio_read32(gt, XE_OAG_RENDER_BUSY_FREE);
+ break;
+ case __XE_SAMPLE_COPY_GROUP_BUSY:
+ val = xe_mmio_read32(gt, XE_OAG_BLT_BUSY_FREE);
+ break;
+ case __XE_SAMPLE_MEDIA_GROUP_BUSY:
+ val = xe_mmio_read32(gt, XE_OAG_ANY_MEDIA_FF_BUSY_FREE);
+ break;
+ case __XE_SAMPLE_ANY_ENGINE_GROUP_BUSY:
+ val = xe_mmio_read32(gt, XE_OAG_RC0_ANY_ENGINE_BUSY_FREE);
+ break;
+ default:
+ drm_warn(>->tile->xe->drm, "unknown pmu event\n");
+ }
+
+ return xe_gt_clock_cycles_to_ns(gt, val * 16);
+}
+
+static u64 engine_group_busyness_read(struct xe_gt *gt, u64 config)
+{
+ int sample_type = config_counter(config) - 1;
+ const unsigned int gt_id = gt->info.id;
+ struct xe_device *xe = gt->tile->xe;
+ struct xe_pmu *pmu = &xe->pmu;
+ unsigned long flags;
+ bool device_awake;
+ u64 val;
+
+ device_awake = xe_device_mem_access_get_if_ongoing(xe);
+ if (device_awake) {
+ XE_WARN_ON(xe_force_wake_get(gt_to_fw(gt), XE_FW_GT));
+ val = __engine_group_busyness_read(gt, sample_type);
+ XE_WARN_ON(xe_force_wake_put(gt_to_fw(gt), XE_FW_GT));
+ xe_device_mem_access_put(xe);
+ }
+
+ spin_lock_irqsave(&pmu->lock, flags);
+
+ if (device_awake)
+ pmu->sample[gt_id][sample_type] = val;
+ else
+ val = pmu->sample[gt_id][sample_type];
+
+ spin_unlock_irqrestore(&pmu->lock, flags);
+
+ return val;
+}
+
+static void engine_group_busyness_store(struct xe_gt *gt)
+{
+ struct xe_pmu *pmu = >->tile->xe->pmu;
+ unsigned int gt_id = gt->info.id;
+ unsigned long flags;
+ int i;
+
+ spin_lock_irqsave(&pmu->lock, flags);
+
+ for (i = __XE_SAMPLE_RENDER_GROUP_BUSY; i <= __XE_SAMPLE_ANY_ENGINE_GROUP_BUSY; i++)
+ pmu->sample[gt_id][i] = __engine_group_busyness_read(gt, i);
+
+ spin_unlock_irqrestore(&pmu->lock, flags);
+}
+
+static int
+config_status(struct xe_device *xe, u64 config)
+{
+ unsigned int gt_id = config_gt_id(config);
+ struct xe_gt *gt = xe_device_get_gt(xe, gt_id);
+
+ if (gt_id >= XE_PMU_MAX_GT)
+ return -ENOENT;
+
+ switch (config_counter(config)) {
+ case XE_PMU_INTERRUPTS(0):
+ if (gt_id)
+ return -ENOENT;
+ break;
+ case XE_PMU_RENDER_GROUP_BUSY(0):
+ case XE_PMU_COPY_GROUP_BUSY(0):
+ case XE_PMU_ANY_ENGINE_GROUP_BUSY(0):
+ if (gt->info.type == XE_GT_TYPE_MEDIA)
+ return -ENOENT;
+ break;
+ case XE_PMU_MEDIA_GROUP_BUSY(0):
+ if (!(gt->info.engine_mask & (BIT(XE_HW_ENGINE_VCS0) | BIT(XE_HW_ENGINE_VECS0))))
+ return -ENOENT;
+ break;
+ default:
+ return -ENOENT;
+ }
+
+ return 0;
+}
+
+static int xe_pmu_event_init(struct perf_event *event)
+{
+ struct xe_device *xe =
+ container_of(event->pmu, typeof(*xe), pmu.base);
+ struct xe_pmu *pmu = &xe->pmu;
+ int ret;
+
+ if (pmu->closed)
+ return -ENODEV;
+
+ if (event->attr.type != event->pmu->type)
+ return -ENOENT;
+
+ /* unsupported modes and filters */
+ if (event->attr.sample_period) /* no sampling */
+ return -EINVAL;
+
+ if (has_branch_stack(event))
+ return -EOPNOTSUPP;
+
+ if (event->cpu < 0)
+ return -EINVAL;
+
+ /* only allow running on one cpu at a time */
+ if (!cpumask_test_cpu(event->cpu, &xe_pmu_cpumask))
+ return -EINVAL;
+
+ ret = config_status(xe, event->attr.config);
+ if (ret)
+ return ret;
+
+ if (!event->parent) {
+ drm_dev_get(&xe->drm);
+ event->destroy = xe_pmu_event_destroy;
+ }
+
+ return 0;
+}
+
+static u64 __xe_pmu_event_read(struct perf_event *event)
+{
+ struct xe_device *xe =
+ container_of(event->pmu, typeof(*xe), pmu.base);
+ const unsigned int gt_id = config_gt_id(event->attr.config);
+ const u64 config = event->attr.config;
+ struct xe_gt *gt = xe_device_get_gt(xe, gt_id);
+ struct xe_pmu *pmu = &xe->pmu;
+ u64 val;
+
+ switch (config_counter(config)) {
+ case XE_PMU_INTERRUPTS(0):
+ val = READ_ONCE(pmu->irq_count);
+ break;
+ case XE_PMU_RENDER_GROUP_BUSY(0):
+ case XE_PMU_COPY_GROUP_BUSY(0):
+ case XE_PMU_ANY_ENGINE_GROUP_BUSY(0):
+ case XE_PMU_MEDIA_GROUP_BUSY(0):
+ val = engine_group_busyness_read(gt, config);
+ break;
+ default:
+ drm_warn(>->tile->xe->drm, "unknown pmu event\n");
+ }
+
+ return val;
+}
+
+static void xe_pmu_event_read(struct perf_event *event)
+{
+ struct xe_device *xe =
+ container_of(event->pmu, typeof(*xe), pmu.base);
+ struct hw_perf_event *hwc = &event->hw;
+ struct xe_pmu *pmu = &xe->pmu;
+ u64 prev, new;
+
+ if (pmu->closed) {
+ event->hw.state = PERF_HES_STOPPED;
+ return;
+ }
+again:
+ prev = local64_read(&hwc->prev_count);
+ new = __xe_pmu_event_read(event);
+
+ if (local64_cmpxchg(&hwc->prev_count, prev, new) != prev)
+ goto again;
+
+ local64_add(new - prev, &event->count);
+}
+
+static void xe_pmu_enable(struct perf_event *event)
+{
+ /*
+ * Store the current counter value so we can report the correct delta
+ * for all listeners. Even when the event was already enabled and has
+ * an existing non-zero value.
+ */
+ local64_set(&event->hw.prev_count, __xe_pmu_event_read(event));
+}
+
+static void xe_pmu_event_start(struct perf_event *event, int flags)
+{
+ struct xe_device *xe =
+ container_of(event->pmu, typeof(*xe), pmu.base);
+ struct xe_pmu *pmu = &xe->pmu;
+
+ if (pmu->closed)
+ return;
+
+ xe_pmu_enable(event);
+ event->hw.state = 0;
+}
+
+static void xe_pmu_event_stop(struct perf_event *event, int flags)
+{
+ if (flags & PERF_EF_UPDATE)
+ xe_pmu_event_read(event);
+
+ event->hw.state = PERF_HES_STOPPED;
+}
+
+static int xe_pmu_event_add(struct perf_event *event, int flags)
+{
+ struct xe_device *xe =
+ container_of(event->pmu, typeof(*xe), pmu.base);
+ struct xe_pmu *pmu = &xe->pmu;
+
+ if (pmu->closed)
+ return -ENODEV;
+
+ if (flags & PERF_EF_START)
+ xe_pmu_event_start(event, flags);
+
+ return 0;
+}
+
+static void xe_pmu_event_del(struct perf_event *event, int flags)
+{
+ xe_pmu_event_stop(event, PERF_EF_UPDATE);
+}
+
+static int xe_pmu_event_event_idx(struct perf_event *event)
+{
+ return 0;
+}
+
+struct xe_ext_attribute {
+ struct device_attribute attr;
+ unsigned long val;
+};
+
+static ssize_t xe_pmu_event_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct xe_ext_attribute *eattr;
+
+ eattr = container_of(attr, struct xe_ext_attribute, attr);
+ return sprintf(buf, "config=0x%lx\n", eattr->val);
+}
+
+static ssize_t cpumask_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return cpumap_print_to_pagebuf(true, buf, &xe_pmu_cpumask);
+}
+
+static DEVICE_ATTR_RO(cpumask);
+
+static struct attribute *xe_cpumask_attrs[] = {
+ &dev_attr_cpumask.attr,
+ NULL,
+};
+
+static const struct attribute_group xe_pmu_cpumask_attr_group = {
+ .attrs = xe_cpumask_attrs,
+};
+
+#define __event(__counter, __name, __unit) \
+{ \
+ .counter = (__counter), \
+ .name = (__name), \
+ .unit = (__unit), \
+ .global = false, \
+}
+
+#define __global_event(__counter, __name, __unit) \
+{ \
+ .counter = (__counter), \
+ .name = (__name), \
+ .unit = (__unit), \
+ .global = true, \
+}
+
+static struct xe_ext_attribute *
+add_xe_attr(struct xe_ext_attribute *attr, const char *name, u64 config)
+{
+ sysfs_attr_init(&attr->attr.attr);
+ attr->attr.attr.name = name;
+ attr->attr.attr.mode = 0444;
+ attr->attr.show = xe_pmu_event_show;
+ attr->val = config;
+
+ return ++attr;
+}
+
+static struct perf_pmu_events_attr *
+add_pmu_attr(struct perf_pmu_events_attr *attr, const char *name,
+ const char *str)
+{
+ sysfs_attr_init(&attr->attr.attr);
+ attr->attr.attr.name = name;
+ attr->attr.attr.mode = 0444;
+ attr->attr.show = perf_event_sysfs_show;
+ attr->event_str = str;
+
+ return ++attr;
+}
+
+static struct attribute **
+create_event_attributes(struct xe_pmu *pmu)
+{
+ struct xe_device *xe = container_of(pmu, typeof(*xe), pmu);
+ static const struct {
+ unsigned int counter;
+ const char *name;
+ const char *unit;
+ bool global;
+ } events[] = {
+ __global_event(0, "interrupts", NULL),
+ __event(1, "render-group-busy", "ns"),
+ __event(2, "copy-group-busy", "ns"),
+ __event(3, "media-group-busy", "ns"),
+ __event(4, "any-engine-group-busy", "ns"),
+ };
+
+ struct perf_pmu_events_attr *pmu_attr = NULL, *pmu_iter;
+ struct xe_ext_attribute *xe_attr = NULL, *xe_iter;
+ struct attribute **attr = NULL, **attr_iter;
+ unsigned int count = 0;
+ unsigned int i, j;
+ struct xe_gt *gt;
+
+ /* Count how many counters we will be exposing. */
+ for_each_gt(gt, xe, j) {
+ for (i = 0; i < ARRAY_SIZE(events); i++) {
+ u64 config = ___XE_PMU_OTHER(j, events[i].counter);
+
+ if (!config_status(xe, config))
+ count++;
+ }
+ }
+
+ /* Allocate attribute objects and table. */
+ xe_attr = kcalloc(count, sizeof(*xe_attr), GFP_KERNEL);
+ if (!xe_attr)
+ goto err_alloc;
+
+ pmu_attr = kcalloc(count, sizeof(*pmu_attr), GFP_KERNEL);
+ if (!pmu_attr)
+ goto err_alloc;
+
+ /* Max one pointer of each attribute type plus a termination entry. */
+ attr = kcalloc(count * 2 + 1, sizeof(*attr), GFP_KERNEL);
+ if (!attr)
+ goto err_alloc;
+
+ xe_iter = xe_attr;
+ pmu_iter = pmu_attr;
+ attr_iter = attr;
+
+ for_each_gt(gt, xe, j) {
+ for (i = 0; i < ARRAY_SIZE(events); i++) {
+ u64 config = ___XE_PMU_OTHER(j, events[i].counter);
+ char *str;
+
+ if (config_status(xe, config))
+ continue;
+
+ if (events[i].global)
+ str = kstrdup(events[i].name, GFP_KERNEL);
+ else
+ str = kasprintf(GFP_KERNEL, "%s-gt%u",
+ events[i].name, j);
+ if (!str)
+ goto err;
+
+ *attr_iter++ = &xe_iter->attr.attr;
+ xe_iter = add_xe_attr(xe_iter, str, config);
+
+ if (events[i].unit) {
+ if (events[i].global)
+ str = kasprintf(GFP_KERNEL, "%s.unit",
+ events[i].name);
+ else
+ str = kasprintf(GFP_KERNEL, "%s-gt%u.unit",
+ events[i].name, j);
+ if (!str)
+ goto err;
+
+ *attr_iter++ = &pmu_iter->attr.attr;
+ pmu_iter = add_pmu_attr(pmu_iter, str,
+ events[i].unit);
+ }
+ }
+ }
+
+ pmu->xe_attr = xe_attr;
+ pmu->pmu_attr = pmu_attr;
+
+ return attr;
+
+err:
+ for (attr_iter = attr; *attr_iter; attr_iter++)
+ kfree((*attr_iter)->name);
+
+err_alloc:
+ kfree(attr);
+ kfree(xe_attr);
+ kfree(pmu_attr);
+
+ return NULL;
+}
+
+static void free_event_attributes(struct xe_pmu *pmu)
+{
+ struct attribute **attr_iter = pmu->events_attr_group.attrs;
+
+ for (; *attr_iter; attr_iter++)
+ kfree((*attr_iter)->name);
+
+ kfree(pmu->events_attr_group.attrs);
+ kfree(pmu->xe_attr);
+ kfree(pmu->pmu_attr);
+
+ pmu->events_attr_group.attrs = NULL;
+ pmu->xe_attr = NULL;
+ pmu->pmu_attr = NULL;
+}
+
+static int xe_pmu_cpu_online(unsigned int cpu, struct hlist_node *node)
+{
+ struct xe_pmu *pmu = hlist_entry_safe(node, typeof(*pmu), cpuhp.node);
+
+ /* Select the first online CPU as a designated reader. */
+ if (cpumask_empty(&xe_pmu_cpumask))
+ cpumask_set_cpu(cpu, &xe_pmu_cpumask);
+
+ return 0;
+}
+
+static int xe_pmu_cpu_offline(unsigned int cpu, struct hlist_node *node)
+{
+ struct xe_pmu *pmu = hlist_entry_safe(node, typeof(*pmu), cpuhp.node);
+ unsigned int target = xe_pmu_target_cpu;
+
+ /*
+ * Unregistering an instance generates a CPU offline event which we must
+ * ignore to avoid incorrectly modifying the shared xe_pmu_cpumask.
+ */
+ if (pmu->closed)
+ return 0;
+
+ if (cpumask_test_and_clear_cpu(cpu, &xe_pmu_cpumask)) {
+ target = cpumask_any_but(topology_sibling_cpumask(cpu), cpu);
+
+ /* Migrate events if there is a valid target */
+ if (target < nr_cpu_ids) {
+ cpumask_set_cpu(target, &xe_pmu_cpumask);
+ xe_pmu_target_cpu = target;
+ }
+ }
+
+ if (target < nr_cpu_ids && target != pmu->cpuhp.cpu) {
+ perf_pmu_migrate_context(&pmu->base, cpu, target);
+ pmu->cpuhp.cpu = target;
+ }
+
+ return 0;
+}
+
+static enum cpuhp_state cpuhp_slot = CPUHP_INVALID;
+
+int xe_pmu_init(void)
+{
+ int ret;
+
+ ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN,
+ "perf/x86/intel/xe:online",
+ xe_pmu_cpu_online,
+ xe_pmu_cpu_offline);
+ if (ret < 0)
+ pr_notice("Failed to setup cpuhp state for xe PMU! (%d)\n",
+ ret);
+ else
+ cpuhp_slot = ret;
+
+ return 0;
+}
+
+void xe_pmu_exit(void)
+{
+ if (cpuhp_slot != CPUHP_INVALID)
+ cpuhp_remove_multi_state(cpuhp_slot);
+}
+
+static int xe_pmu_register_cpuhp_state(struct xe_pmu *pmu)
+{
+ if (cpuhp_slot == CPUHP_INVALID)
+ return -EINVAL;
+
+ return cpuhp_state_add_instance(cpuhp_slot, &pmu->cpuhp.node);
+}
+
+static void xe_pmu_unregister_cpuhp_state(struct xe_pmu *pmu)
+{
+ cpuhp_state_remove_instance(cpuhp_slot, &pmu->cpuhp.node);
+}
+
+void xe_pmu_suspend(struct xe_gt *gt)
+{
+ engine_group_busyness_store(gt);
+}
+
+static void xe_pmu_unregister(struct drm_device *device, void *arg)
+{
+ struct xe_pmu *pmu = arg;
+
+ if (!pmu->base.event_init)
+ return;
+
+ /*
+ * "Disconnect" the PMU callbacks - since all are atomic synchronize_rcu
+ * ensures all currently executing ones will have exited before we
+ * proceed with unregistration.
+ */
+ pmu->closed = true;
+ synchronize_rcu();
+
+ xe_pmu_unregister_cpuhp_state(pmu);
+
+ perf_pmu_unregister(&pmu->base);
+ pmu->base.event_init = NULL;
+ kfree(pmu->base.attr_groups);
+ kfree(pmu->name);
+ free_event_attributes(pmu);
+}
+
+void xe_pmu_register(struct xe_pmu *pmu)
+{
+ struct xe_device *xe = container_of(pmu, typeof(*xe), pmu);
+ const struct attribute_group *attr_groups[] = {
+ &pmu->events_attr_group,
+ &xe_pmu_cpumask_attr_group,
+ NULL
+ };
+
+ int ret = -ENOMEM;
+
+ spin_lock_init(&pmu->lock);
+ pmu->cpuhp.cpu = -1;
+
+ pmu->name = kasprintf(GFP_KERNEL,
+ "xe_%s",
+ dev_name(xe->drm.dev));
+ if (pmu->name)
+ /* tools/perf reserves colons as special. */
+ strreplace((char *)pmu->name, ':', '_');
+
+ if (!pmu->name)
+ goto err;
+
+ pmu->events_attr_group.name = "events";
+ pmu->events_attr_group.attrs = create_event_attributes(pmu);
+ if (!pmu->events_attr_group.attrs)
+ goto err_name;
+
+ pmu->base.attr_groups = kmemdup(attr_groups, sizeof(attr_groups),
+ GFP_KERNEL);
+ if (!pmu->base.attr_groups)
+ goto err_attr;
+
+ pmu->base.module = THIS_MODULE;
+ pmu->base.task_ctx_nr = perf_invalid_context;
+ pmu->base.event_init = xe_pmu_event_init;
+ pmu->base.add = xe_pmu_event_add;
+ pmu->base.del = xe_pmu_event_del;
+ pmu->base.start = xe_pmu_event_start;
+ pmu->base.stop = xe_pmu_event_stop;
+ pmu->base.read = xe_pmu_event_read;
+ pmu->base.event_idx = xe_pmu_event_event_idx;
+
+ ret = perf_pmu_register(&pmu->base, pmu->name, -1);
+ if (ret)
+ goto err_groups;
+
+ ret = xe_pmu_register_cpuhp_state(pmu);
+ if (ret)
+ goto err_unreg;
+
+ ret = drmm_add_action_or_reset(&xe->drm, xe_pmu_unregister, pmu);
+ if (ret)
+ goto err_cpuhp;
+
+ return;
+
+err_cpuhp:
+ xe_pmu_unregister_cpuhp_state(pmu);
+err_unreg:
+ perf_pmu_unregister(&pmu->base);
+err_groups:
+ kfree(pmu->base.attr_groups);
+err_attr:
+ pmu->base.event_init = NULL;
+ free_event_attributes(pmu);
+err_name:
+ kfree(pmu->name);
+err:
+ drm_notice(&xe->drm, "Failed to register PMU!\n");
+}
projects / linux-2.6-microblaze.git / commitdiff