[Intel-xe] [PATCH v5 3/3] drm/xe/pmu: Enable PMU interface
Rodrigo Vivi
rodrigo.vivi at intel.com
Wed Aug 30 20:58:29 UTC 2023
On Wed, Aug 30, 2023 at 10:45:44AM +0530, Aravind Iddamsetty wrote:
> There are a set of engine group busyness counters provided by HW which are
> perfect fit to be exposed via PMU perf events.
>
> BSPEC: 46559, 46560, 46722, 46729, 52071, 71028
>
> events can be listed using:
> perf list
> xe_0000_03_00.0/any-engine-group-busy-gt0/ [Kernel PMU event]
> xe_0000_03_00.0/copy-group-busy-gt0/ [Kernel PMU event]
> xe_0000_03_00.0/interrupts/ [Kernel PMU event]
> xe_0000_03_00.0/media-group-busy-gt0/ [Kernel PMU event]
> xe_0000_03_00.0/render-group-busy-gt0/ [Kernel PMU event]
>
> and can be read using:
>
> perf stat -e "xe_0000_8c_00.0/render-group-busy-gt0/" -I 1000
> time counts unit events
> 1.001139062 0 ns xe_0000_8c_00.0/render-group-busy-gt0/
> 2.003294678 0 ns xe_0000_8c_00.0/render-group-busy-gt0/
> 3.005199582 0 ns xe_0000_8c_00.0/render-group-busy-gt0/
> 4.007076497 0 ns xe_0000_8c_00.0/render-group-busy-gt0/
> 5.008553068 0 ns xe_0000_8c_00.0/render-group-busy-gt0/
> 6.010531563 43520 ns xe_0000_8c_00.0/render-group-busy-gt0/
> 7.012468029 44800 ns xe_0000_8c_00.0/render-group-busy-gt0/
> 8.013463515 0 ns xe_0000_8c_00.0/render-group-busy-gt0/
> 9.015300183 0 ns xe_0000_8c_00.0/render-group-busy-gt0/
> 10.017233010 0 ns xe_0000_8c_00.0/render-group-busy-gt0/
> 10.971934120 0 ns xe_0000_8c_00.0/render-group-busy-gt0/
>
> The pmu base implementation is taken from i915.
>
> v2:
> Store last known value when device is awake return that while the GT is
> suspended and then update the driver copy when read during awake.
>
> v3:
> 1. drop init_samples, as storing counters before going to suspend should
> be sufficient.
> 2. ported the "drm/i915/pmu: Make PMU sample array two-dimensional" and
> dropped helpers to store and read samples.
> 3. use xe_device_mem_access_get_if_ongoing to check if device is active
> before reading the OA registers.
> 4. dropped format attr as no longer needed
> 5. introduce xe_pmu_suspend to call engine_group_busyness_store
> 6. few other nits.
>
> v4: minor nits.
>
> v5: take forcewake when accessing the OAG registers
>
> Co-developed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> Co-developed-by: Bommu Krishnaiah <krishnaiah.bommu at intel.com>
> Signed-off-by: Aravind Iddamsetty <aravind.iddamsetty at linux.intel.com>
> ---
> drivers/gpu/drm/xe/Makefile | 2 +
> drivers/gpu/drm/xe/regs/xe_gt_regs.h | 5 +
> drivers/gpu/drm/xe/xe_device.c | 2 +
> drivers/gpu/drm/xe/xe_device_types.h | 4 +
> drivers/gpu/drm/xe/xe_gt.c | 2 +
> drivers/gpu/drm/xe/xe_irq.c | 18 +
> drivers/gpu/drm/xe/xe_module.c | 5 +
> drivers/gpu/drm/xe/xe_pmu.c | 679 +++++++++++++++++++++++++++
> drivers/gpu/drm/xe/xe_pmu.h | 25 +
> drivers/gpu/drm/xe/xe_pmu_types.h | 76 +++
> include/uapi/drm/xe_drm.h | 16 +
> 11 files changed, 834 insertions(+)
> create mode 100644 drivers/gpu/drm/xe/xe_pmu.c
> create mode 100644 drivers/gpu/drm/xe/xe_pmu.h
> create mode 100644 drivers/gpu/drm/xe/xe_pmu_types.h
>
> diff --git a/drivers/gpu/drm/xe/Makefile b/drivers/gpu/drm/xe/Makefile
> index 9d2311f8141f..cc95a46b5e4d 100644
> --- a/drivers/gpu/drm/xe/Makefile
> +++ b/drivers/gpu/drm/xe/Makefile
> @@ -233,6 +233,8 @@ xe-$(CONFIG_DRM_XE_DISPLAY) += \
> i915-display/skl_universal_plane.o \
> i915-display/skl_watermark.o
>
> +xe-$(CONFIG_PERF_EVENTS) += xe_pmu.o
> +
> ifeq ($(CONFIG_ACPI),y)
> xe-$(CONFIG_DRM_XE_DISPLAY) += \
> i915-display/intel_acpi.o \
> diff --git a/drivers/gpu/drm/xe/regs/xe_gt_regs.h b/drivers/gpu/drm/xe/regs/xe_gt_regs.h
> index 271ed0cdbe21..e13fbbdf6929 100644
> --- a/drivers/gpu/drm/xe/regs/xe_gt_regs.h
> +++ b/drivers/gpu/drm/xe/regs/xe_gt_regs.h
> @@ -294,6 +294,11 @@
> #define INVALIDATION_BROADCAST_MODE_DIS REG_BIT(12)
> #define GLOBAL_INVALIDATION_MODE REG_BIT(2)
>
> +#define XE_OAG_RC0_ANY_ENGINE_BUSY_FREE XE_REG(0xdb80)
> +#define XE_OAG_ANY_MEDIA_FF_BUSY_FREE XE_REG(0xdba0)
> +#define XE_OAG_BLT_BUSY_FREE XE_REG(0xdbbc)
> +#define XE_OAG_RENDER_BUSY_FREE XE_REG(0xdbdc)
> +
> #define SAMPLER_MODE XE_REG_MCR(0xe18c, XE_REG_OPTION_MASKED)
> #define ENABLE_SMALLPL REG_BIT(15)
> #define SC_DISABLE_POWER_OPTIMIZATION_EBB REG_BIT(9)
> diff --git a/drivers/gpu/drm/xe/xe_device.c b/drivers/gpu/drm/xe/xe_device.c
> index 766df07de979..e7178460c924 100644
> --- a/drivers/gpu/drm/xe/xe_device.c
> +++ b/drivers/gpu/drm/xe/xe_device.c
> @@ -335,6 +335,8 @@ int xe_device_probe(struct xe_device *xe)
>
> xe_debugfs_register(xe);
>
> + xe_pmu_register(&xe->pmu);
> +
> err = drmm_add_action_or_reset(&xe->drm, xe_device_sanitize, xe);
> if (err)
> return err;
> diff --git a/drivers/gpu/drm/xe/xe_device_types.h b/drivers/gpu/drm/xe/xe_device_types.h
> index 750e1f0d3339..a82f28c6a3a0 100644
> --- a/drivers/gpu/drm/xe/xe_device_types.h
> +++ b/drivers/gpu/drm/xe/xe_device_types.h
> @@ -15,6 +15,7 @@
> #include "xe_devcoredump_types.h"
> #include "xe_gt_types.h"
> #include "xe_platform_types.h"
> +#include "xe_pmu.h"
> #include "xe_step_types.h"
>
> #if IS_ENABLED(CONFIG_DRM_XE_DISPLAY)
> @@ -361,6 +362,9 @@ struct xe_device {
> */
> struct task_struct *pm_callback_task;
>
> + /** @pmu: performance monitoring unit */
> + struct xe_pmu pmu;
> +
> /* private: */
>
> #if IS_ENABLED(CONFIG_DRM_XE_DISPLAY)
> diff --git a/drivers/gpu/drm/xe/xe_gt.c b/drivers/gpu/drm/xe/xe_gt.c
> index 3d6a7c11bac1..ded798f54b41 100644
> --- a/drivers/gpu/drm/xe/xe_gt.c
> +++ b/drivers/gpu/drm/xe/xe_gt.c
> @@ -620,6 +620,8 @@ int xe_gt_suspend(struct xe_gt *gt)
> if (err)
> goto err_msg;
>
> + xe_pmu_suspend(gt);
> +
> err = xe_uc_suspend(>->uc);
> if (err)
> goto err_force_wake;
> diff --git a/drivers/gpu/drm/xe/xe_irq.c b/drivers/gpu/drm/xe/xe_irq.c
> index 1dee3e832eb5..0a307274ba74 100644
> --- a/drivers/gpu/drm/xe/xe_irq.c
> +++ b/drivers/gpu/drm/xe/xe_irq.c
> @@ -27,6 +27,20 @@
> #define IIR(offset) XE_REG(offset + 0x8)
> #define IER(offset) XE_REG(offset + 0xc)
>
> +/*
> + * Interrupt statistic for PMU. Increments the counter only if the
> + * interrupt originated from the GPU so interrupts from a device which
> + * shares the interrupt line are not accounted.
> + */
> +static __always_inline void xe_pmu_irq_stats(struct xe_device *xe)
> +{
> + /*
> + * A clever compiler translates that into INC. A not so clever one
> + * should at least prevent store tearing.
> + */
> + WRITE_ONCE(xe->pmu.irq_count, xe->pmu.irq_count + 1);
> +}
> +
> static void assert_iir_is_zero(struct xe_gt *mmio, struct xe_reg reg)
> {
> u32 val = xe_mmio_read32(mmio, reg);
> @@ -337,6 +351,8 @@ static irqreturn_t xelp_irq_handler(int irq, void *arg)
>
> xe_display_irq_enable(xe, gu_misc_iir);
>
> + xe_pmu_irq_stats(xe);
> +
> return IRQ_HANDLED;
> }
>
> @@ -433,6 +449,8 @@ static irqreturn_t dg1_irq_handler(int irq, void *arg)
> dg1_intr_enable(xe, false);
> xe_display_irq_enable(xe, gu_misc_iir);
>
> + xe_pmu_irq_stats(xe);
> +
> return IRQ_HANDLED;
> }
>
> diff --git a/drivers/gpu/drm/xe/xe_module.c b/drivers/gpu/drm/xe/xe_module.c
> index de85494e2280..86557e8f89a1 100644
> --- a/drivers/gpu/drm/xe/xe_module.c
> +++ b/drivers/gpu/drm/xe/xe_module.c
> @@ -12,6 +12,7 @@
> #include "xe_hw_fence.h"
> #include "xe_module.h"
> #include "xe_pci.h"
> +#include "xe_pmu.h"
> #include "xe_sched_job.h"
>
> bool force_execlist = false;
> @@ -49,6 +50,10 @@ static const struct init_funcs init_funcs[] = {
> .init = xe_sched_job_module_init,
> .exit = xe_sched_job_module_exit,
> },
> + {
> + .init = xe_pmu_init,
> + .exit = xe_pmu_exit,
> + },
> {
> .init = xe_register_pci_driver,
> .exit = xe_unregister_pci_driver,
> diff --git a/drivers/gpu/drm/xe/xe_pmu.c b/drivers/gpu/drm/xe/xe_pmu.c
> new file mode 100644
> index 000000000000..41dd422812ff
> --- /dev/null
> +++ b/drivers/gpu/drm/xe/xe_pmu.c
> @@ -0,0 +1,679 @@
> +// 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 int engine_busyness_sample_type(u64 config)
> +{
> + int type = 0;
> +
> + switch (config) {
> + case XE_PMU_RENDER_GROUP_BUSY(0):
> + type = __XE_SAMPLE_RENDER_GROUP_BUSY;
> + break;
> + case XE_PMU_COPY_GROUP_BUSY(0):
> + type = __XE_SAMPLE_COPY_GROUP_BUSY;
> + break;
> + case XE_PMU_MEDIA_GROUP_BUSY(0):
> + type = __XE_SAMPLE_MEDIA_GROUP_BUSY;
> + break;
> + case XE_PMU_ANY_ENGINE_GROUP_BUSY(0):
> + type = __XE_SAMPLE_ANY_ENGINE_GROUP_BUSY;
> + break;
> + }
> +
> + return type;
> +}
> +
> +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 = 0;
> +
> + 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 = engine_busyness_sample_type(config);
> + 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 max_gt_id = xe->info.gt_count > 1 ? 1 : 0;
> + unsigned int gt_id = config_gt_id(config);
> + struct xe_gt *gt = xe_device_get_gt(xe, gt_id);
> +
> + if (gt_id > max_gt_id)
> + 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 = config_counter(event->attr.config);
> + struct xe_gt *gt = xe_device_get_gt(xe, gt_id);
> + struct xe_pmu *pmu = &xe->pmu;
> + u64 val = 0;
> +
> + switch (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);
> + }
> +
> + 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);
> +
> + BUG_ON(!pmu->base.event_init);
> +
> + /* 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;
> +
> + BUG_ON(!pmu->base.event_init);
> +
> + /*
> + * 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");
> +}
> diff --git a/drivers/gpu/drm/xe/xe_pmu.h b/drivers/gpu/drm/xe/xe_pmu.h
> new file mode 100644
> index 000000000000..a99d4ddd023e
> --- /dev/null
> +++ b/drivers/gpu/drm/xe/xe_pmu.h
> @@ -0,0 +1,25 @@
> +/* SPDX-License-Identifier: MIT */
> +/*
> + * Copyright © 2023 Intel Corporation
> + */
> +
> +#ifndef _XE_PMU_H_
> +#define _XE_PMU_H_
> +
> +#include "xe_gt_types.h"
> +#include "xe_pmu_types.h"
> +
> +#if IS_ENABLED(CONFIG_PERF_EVENTS)
> +int xe_pmu_init(void);
> +void xe_pmu_exit(void);
> +void xe_pmu_register(struct xe_pmu *pmu);
> +void xe_pmu_suspend(struct xe_gt *gt);
> +#else
> +static inline int xe_pmu_init(void) { return 0; }
> +static inline void xe_pmu_exit(void) {}
> +static inline void xe_pmu_register(struct xe_pmu *pmu) {}
> +static inline void xe_pmu_suspend(struct xe_gt *gt) {}
> +#endif
> +
> +#endif
> +
> diff --git a/drivers/gpu/drm/xe/xe_pmu_types.h b/drivers/gpu/drm/xe/xe_pmu_types.h
> new file mode 100644
> index 000000000000..4ccc7e9042f6
> --- /dev/null
> +++ b/drivers/gpu/drm/xe/xe_pmu_types.h
> @@ -0,0 +1,76 @@
> +/* SPDX-License-Identifier: MIT */
> +/*
> + * Copyright © 2023 Intel Corporation
> + */
> +
> +#ifndef _XE_PMU_TYPES_H_
> +#define _XE_PMU_TYPES_H_
> +
> +#include <linux/perf_event.h>
> +#include <linux/spinlock_types.h>
> +#include <uapi/drm/xe_drm.h>
> +
> +enum {
> + __XE_SAMPLE_RENDER_GROUP_BUSY,
> + __XE_SAMPLE_COPY_GROUP_BUSY,
> + __XE_SAMPLE_MEDIA_GROUP_BUSY,
> + __XE_SAMPLE_ANY_ENGINE_GROUP_BUSY,
> + __XE_NUM_PMU_SAMPLERS
> +};
> +
> +#define XE_PMU_MAX_GT 2
> +
> +struct xe_pmu {
> + /**
> + * @cpuhp: Struct used for CPU hotplug handling.
> + */
> + struct {
> + struct hlist_node node;
> + unsigned int cpu;
> + } cpuhp;
> + /**
> + * @base: PMU base.
> + */
> + struct pmu base;
> + /**
> + * @closed: xe is unregistering.
> + */
> + bool closed;
> + /**
> + * @name: Name as registered with perf core.
> + */
> + const char *name;
> + /**
> + * @lock: Lock protecting enable mask and ref count handling.
> + */
> + spinlock_t lock;
> + /**
> + * @sample: Current and previous (raw) counters.
> + *
> + * These counters are updated when the device is awake.
> + *
> + */
> + u64 sample[XE_PMU_MAX_GT][__XE_NUM_PMU_SAMPLERS];
> + /**
> + * @irq_count: Number of interrupts
> + *
> + * Intentionally unsigned long to avoid atomics or heuristics on 32bit.
> + * 4e9 interrupts are a lot and postprocessing can really deal with an
> + * occasional wraparound easily. It's 32bit after all.
> + */
> + unsigned long irq_count;
> + /**
> + * @events_attr_group: Device events attribute group.
> + */
> + struct attribute_group events_attr_group;
> + /**
> + * @xe_attr: Memory block holding device attributes.
> + */
> + void *xe_attr;
> + /**
> + * @pmu_attr: Memory block holding device attributes.
> + */
> + void *pmu_attr;
> +};
> +
> +#endif
> diff --git a/include/uapi/drm/xe_drm.h b/include/uapi/drm/xe_drm.h
> index 86f16d50e9cc..75c9a7fe3490 100644
> --- a/include/uapi/drm/xe_drm.h
> +++ b/include/uapi/drm/xe_drm.h
> @@ -1056,6 +1056,22 @@ struct drm_xe_vm_madvise {
> __u64 reserved[2];
> };
>
> +/* PMU event config IDs */
> +
> +/*
> + * Top bits of every counter are GT id.
> + */
> +#define __XE_PMU_GT_SHIFT (56)
> +
> +#define ___XE_PMU_OTHER(gt, x) \
> + (((__u64)(x)) | ((__u64)(gt) << __XE_PMU_GT_SHIFT))
> +
> +#define XE_PMU_INTERRUPTS(gt) ___XE_PMU_OTHER(gt, 0)
> +#define XE_PMU_RENDER_GROUP_BUSY(gt) ___XE_PMU_OTHER(gt, 1)
> +#define XE_PMU_COPY_GROUP_BUSY(gt) ___XE_PMU_OTHER(gt, 2)
> +#define XE_PMU_MEDIA_GROUP_BUSY(gt) ___XE_PMU_OTHER(gt, 3)
> +#define XE_PMU_ANY_ENGINE_GROUP_BUSY(gt) ___XE_PMU_OTHER(gt, 4)
Could you please add uapi documentation here showing examples on how
this is used and all?
> +
> #if defined(__cplusplus)
> }
> #endif
> --
> 2.25.1
>
More information about the Intel-xe
mailing list