[PATCH 07/12] drm/i915: Track all user contexts per client
Chris Wilson
chris at chris-wilson.co.uk
Thu Nov 19 10:02:55 UTC 2020
From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
We soon want to start answering questions like how much GPU time is the
context belonging to a client which exited still using.
To enable this we start tracking all context belonging to a client on a
separate list.
v2:
* Keep adding to gem.contexts.list as last. (Lucas)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
drivers/gpu/drm/i915/gem/i915_gem_context.c | 12 ++
.../gpu/drm/i915/gem/i915_gem_context_types.h | 3 +
drivers/gpu/drm/i915/i915_drm_client.c | 106 +++++++++++++++++-
drivers/gpu/drm/i915/i915_drm_client.h | 15 +++
4 files changed, 135 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index e03ca56efd5b..e798ad8cc773 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -598,6 +598,7 @@ static void set_closed_name(struct i915_gem_context *ctx)
static void context_close(struct i915_gem_context *ctx)
{
struct i915_address_space *vm;
+ struct i915_drm_client *client;
/* Flush any concurrent set_engines() */
mutex_lock(&ctx->engines_mutex);
@@ -626,6 +627,13 @@ static void context_close(struct i915_gem_context *ctx)
list_del(&ctx->link);
spin_unlock(&ctx->i915->gem.contexts.lock);
+ client = ctx->client;
+ if (client) {
+ spin_lock(&client->ctx_lock);
+ list_del_rcu(&ctx->client_link);
+ spin_unlock(&client->ctx_lock);
+ }
+
mutex_unlock(&ctx->mutex);
/*
@@ -929,6 +937,10 @@ static int gem_context_register(struct i915_gem_context *ctx,
ctx->client = client;
+ spin_lock(&client->ctx_lock);
+ list_add_tail_rcu(&ctx->client_link, &client->ctx_list);
+ spin_unlock(&client->ctx_lock);
+
spin_lock(&i915->gem.contexts.lock);
list_add_tail(&ctx->link, &i915->gem.contexts.list);
spin_unlock(&i915->gem.contexts.lock);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
index c47bb45d2110..085f6a3735e8 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
@@ -102,6 +102,9 @@ struct i915_gem_context {
/** client: struct i915_drm_client */
struct i915_drm_client *client;
+ /** link: &drm_client.context_list */
+ struct list_head client_link;
+
/**
* @ref: reference count
*
diff --git a/drivers/gpu/drm/i915/i915_drm_client.c b/drivers/gpu/drm/i915/i915_drm_client.c
index 3ace17556194..65dd049b1f7d 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 +60,97 @@ show_client_pid(struct device *kdev, struct device_attribute *attr, char *buf)
return ret;
}
+static u64 pphwsp_busy_add(struct i915_gem_context *ctx, unsigned int class)
+{
+ struct i915_gem_engines *engines = rcu_dereference(ctx->engines);
+ struct i915_gem_engines_iter it;
+ struct intel_context *ce;
+ u64 total = 0;
+
+ for_each_gem_engine(ce, engines, it) {
+ if (ce->engine->uabi_class == class)
+ total += ce->runtime.total;
+ }
+
+ return total;
+}
+
+static ssize_t
+show_client_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;
+ struct i915_drm_client *client = i915_attr->client;
+ u64 total = atomic64_read(&client->past_runtime[class]);
+ struct list_head *list = &client->ctx_list;
+ struct i915_gem_context *ctx;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(ctx, list, client_link)
+ total += pphwsp_busy_add(ctx, class);
+ rcu_read_unlock();
+
+ total *= RUNTIME_INFO(client->clients->i915)->cs_timestamp_period_ns;
+
+ return snprintf(buf, PAGE_SIZE, "%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 (!HAS_LOGICAL_RING_CONTEXTS(clients->i915))
+ 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_client_busy;
+
+ ret = sysfs_create_file(client->busy_root,
+ (struct attribute *)attr);
+ if (ret)
+ goto err;
+ }
+
+ return 0;
+
+err:
+ 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 +186,12 @@ static int __client_register_sysfs(struct i915_drm_client *client)
ret = sysfs_create_file(client->root, (struct attribute *)attr);
if (ret)
- break;
+ goto out;
}
+ ret = __client_register_sysfs_busy(client);
+
+out:
if (ret)
kobject_put(client->root);
@@ -101,6 +200,8 @@ 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));
}
@@ -196,6 +297,9 @@ i915_drm_client_add(struct i915_drm_clients *clients, struct task_struct *task)
kref_init(&client->kref);
mutex_init(&client->update_lock);
+ spin_lock_init(&client->ctx_lock);
+ INIT_LIST_HEAD(&client->ctx_list);
+
client->clients = clients;
INIT_RCU_WORK(&client->rcu, __rcu_i915_drm_client_free);
diff --git a/drivers/gpu/drm/i915/i915_drm_client.h b/drivers/gpu/drm/i915/i915_drm_client.h
index c2ca28335c15..6365723d89e0 100644
--- a/drivers/gpu/drm/i915/i915_drm_client.h
+++ b/drivers/gpu/drm/i915/i915_drm_client.h
@@ -9,10 +9,12 @@
#include <linux/device.h>
#include <linux/kobject.h>
#include <linux/kref.h>
+#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/pid.h>
#include <linux/rcupdate.h>
#include <linux/sched.h>
+#include <linux/spinlock.h>
#include <linux/xarray.h>
#include "gt/intel_engine_types.h"
@@ -28,6 +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;
@@ -46,12 +56,17 @@ struct i915_drm_client {
struct i915_drm_client_name __rcu *name;
bool closed;
+ spinlock_t ctx_lock; /* For add/remove from ctx_list. */
+ struct list_head ctx_list; /* List of contexts belonging to 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;
/**
--
2.20.1
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