From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Expose per-client and per-engine busyness under the previously added sysfs
client root.
The new files are one per-engine instance and located under the 'busy'
directory. Each contains a monotonically increasing nano-second resolution
times each client's jobs were executing on the GPU.
This enables userspace to create a top-like tool for GPU utilization:
==========================================================================
intel-gpu-top - 935/ 935 MHz; 0% RC6; 14.73 Watts; 1097 irqs/s
IMC reads: 1401 MiB/s
IMC writes: 4 MiB/s
ENGINE BUSY MI_SEMA MI_WAIT
Render/3D/0 63.73% |███████████████████ | 3% 0%
Blitter/0 9.53% |██▊ | 6% 0%
Video/0 39.32% |███████████▊ | 16% 0%
Video/1 15.62% |████▋ | 0% 0%
VideoEnhance/0 0.00% | | 0% 0%
PID NAME RCS BCS VCS VECS
4084 gem_wsim |█████▌ ||█ || || |
4086 gem_wsim |█▌ || ||███ || |
==========================================================================
v2: Use intel_context_engine_get_busy_time.
v3: New directory structure.
v4: Rebase.
v5: sysfs_attr_init.
v6: Small tidy in i915_gem_add_client.
v7: Rebase to be engine class based.
v8:
* Always enable stats.
* Walk all client contexts.
v9:
* Skip unsupported engine classes. (Chris)
* Use scheduler caps. (Chris)
v10:
* Use pphwsp runtime only.
Link: https://patchwork.freedesktop.org/series/71182/ # intel_gpu_top
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Reviewed-by: Aravind Iddamsetty <aravind.iddamsetty@xxxxxxxxx>
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20210123153733.18139-8-chris@xxxxxxxxxxxxxxxxxx
Link: https://patchwork.freedesktop.org/patch/msgid/20210124153136.19124-8-chris@xxxxxxxxxxxxxxxxxx
---
drivers/gpu/drm/i915/i915_drm_client.c | 101 ++++++++++++++++++++++++-
drivers/gpu/drm/i915/i915_drm_client.h | 10 +++
2 files changed, 110 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_drm_client.c b/drivers/gpu/drm/i915/i915_drm_client.c
index 0ca81a750895..1f8b08a413d4 100644
--- a/drivers/gpu/drm/i915/i915_drm_client.c
+++ b/drivers/gpu/drm/i915/i915_drm_client.c
@@ -9,6 +9,11 @@
#include <drm/drm_print.h>
+#include <uapi/drm/i915_drm.h>
+
+#include "gem/i915_gem_context.h"
+#include "gt/intel_engine_user.h"
+
#include "i915_drm_client.h"
#include "i915_drv.h"
#include "i915_gem.h"
@@ -55,6 +60,95 @@ show_client_pid(struct device *kdev, struct device_attribute *attr, char *buf)
return ret;
}
+static u64 busy_add(struct i915_gem_context *ctx, unsigned int class)
+{
+ struct i915_gem_engines_iter it;
+ struct intel_context *ce;
+ u64 total = 0;
+
+ for_each_gem_engine(ce, rcu_dereference(ctx->engines), it) {
+ if (ce->engine->uabi_class != class)
+ continue;
+
+ total += intel_context_get_total_runtime_ns(ce);
+ }
+
+ return total;
+}
+
+static ssize_t
+show_busy(struct device *kdev, struct device_attribute *attr, char *buf)
+{
+ struct i915_engine_busy_attribute *i915_attr =
+ container_of(attr, typeof(*i915_attr), attr);
+ unsigned int class = i915_attr->engine_class;
+ const struct i915_drm_client *client = i915_attr->client;
+ const struct list_head *list = &client->ctx_list;
+ u64 total = atomic64_read(&client->past_runtime[class]);
+ struct i915_gem_context *ctx;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(ctx, list, client_link)
+ total += busy_add(ctx, class);
+ rcu_read_unlock();
+
+ return sysfs_emit(buf, "%llu\n", total);
+}
+
+static const char * const uabi_class_names[] = {
+ [I915_ENGINE_CLASS_RENDER] = "0",
+ [I915_ENGINE_CLASS_COPY] = "1",
+ [I915_ENGINE_CLASS_VIDEO] = "2",
+ [I915_ENGINE_CLASS_VIDEO_ENHANCE] = "3",
+};
+
+static int __client_register_sysfs_busy(struct i915_drm_client *client)
+{
+ struct i915_drm_clients *clients = client->clients;
+ unsigned int i;
+ int ret = 0;
+
+ if (!(clients->i915->caps.scheduler & I915_SCHEDULER_CAP_ENGINE_BUSY_STATS))
+ return 0;
+
+ client->busy_root = kobject_create_and_add("busy", client->root);
+ if (!client->busy_root)
+ return -ENOMEM;
+
+ for (i = 0; i < ARRAY_SIZE(uabi_class_names); i++) {
+ struct i915_engine_busy_attribute *i915_attr =
+ &client->attr.busy[i];
+ struct device_attribute *attr = &i915_attr->attr;
+
+ if (!intel_engine_lookup_user(clients->i915, i, 0))
+ continue;
+
+ i915_attr->client = client;
+ i915_attr->engine_class = i;
+
+ sysfs_attr_init(&attr->attr);
+
+ attr->attr.name = uabi_class_names[i];
+ attr->attr.mode = 0444;
+ attr->show = show_busy;
+
+ ret = sysfs_create_file(client->busy_root, &attr->attr);
+ if (ret)
+ goto out;
+ }
+
+out:
+ if (ret)
+ kobject_put(client->busy_root);
+
+ return ret;
+}
+
+static void __client_unregister_sysfs_busy(struct i915_drm_client *client)
+{
+ kobject_put(fetch_and_zero(&client->busy_root));
+}
+
static int __client_register_sysfs(struct i915_drm_client *client)
{
const struct {
@@ -90,9 +184,12 @@ static int __client_register_sysfs(struct i915_drm_client *client)
ret = sysfs_create_file(client->root, &attr->attr);
if (ret)
- break;
+ goto out;
}
+ ret = __client_register_sysfs_busy(client);
+
+out:
if (ret)
kobject_put(client->root);
@@ -101,6 +198,8 @@ static int __client_register_sysfs(struct i915_drm_client *client)
static void __client_unregister_sysfs(struct i915_drm_client *client)
{
+ __client_unregister_sysfs_busy(client);
+
kobject_put(fetch_and_zero(&client->root));
}
diff --git a/drivers/gpu/drm/i915/i915_drm_client.h b/drivers/gpu/drm/i915/i915_drm_client.h
index 13f92142e474..83660fa9d2d7 100644
--- a/drivers/gpu/drm/i915/i915_drm_client.h
+++ b/drivers/gpu/drm/i915/i915_drm_client.h
@@ -30,6 +30,14 @@ struct i915_drm_clients {
struct kobject *root;
};
+struct i915_drm_client;
+
+struct i915_engine_busy_attribute {
+ struct device_attribute attr;
+ struct i915_drm_client *client;
+ unsigned int engine_class;
+};
+
struct i915_drm_client_name {
struct rcu_head rcu;
struct i915_drm_client *client;
@@ -54,9 +62,11 @@ struct i915_drm_client {
struct i915_drm_clients *clients;
struct kobject *root;
+ struct kobject *busy_root;
struct {
struct device_attribute pid;
struct device_attribute name;
+ struct i915_engine_busy_attribute busy[MAX_ENGINE_CLASS + 1];
} attr;
/**
--
2.30.2
