From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Expose a list of clients with open file handles in sysfs.
This will be a basis for a top-like utility showing per-client and per-
engine GPU load.
Currently we only expose each client's pid and name under opaque numbered
directories in /sys/class/drm/card0/clients/.
For instance:
/sys/class/drm/card0/clients/3/name: Xorg
/sys/class/drm/card0/clients/3/pid: 5664
v2:
Chris Wilson:
* Enclose new members into dedicated structs.
* Protect against failed sysfs registration.
v3:
* sysfs_attr_init.
v4:
* Fix for internal clients.
v5:
* Use cyclic ida for client id. (Chris)
* Do not leak pid reference. (Chris)
* Tidy code with some locals.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 21 +++++
drivers/gpu/drm/i915/i915_gem.c | 148 ++++++++++++++++++++++++++++--
drivers/gpu/drm/i915/i915_sysfs.c | 8 ++
3 files changed, 167 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 0781b6326b8c..9fcbcb6d6f76 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -224,6 +224,20 @@ struct drm_i915_file_private {
/** ban_score: Accumulated score of all ctx bans and fast hangs. */
atomic_t ban_score;
unsigned long hang_timestamp;
+
+ struct i915_drm_client {
+ unsigned int id;
+
+ struct pid *pid;
+ char *name;
+
+ struct kobject *root;
+
+ struct {
+ struct device_attribute pid;
+ struct device_attribute name;
+ } attr;
+ } client;
};
/* Interface history:
@@ -1278,6 +1292,13 @@ struct drm_i915_private {
struct i915_pmu pmu;
+ struct i915_drm_clients {
+ spinlock_t idr_lock;
+ struct idr idr;
+
+ struct kobject *root;
+ } clients;
+
struct i915_hdcp_comp_master *hdcp_master;
bool hdcp_comp_added;
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 5eeef1ef7448..a65cd7e1ce7b 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1457,11 +1457,14 @@ static void i915_gem_init__mm(struct drm_i915_private *i915)
i915_gem_init__objects(i915);
}
-void i915_gem_init_early(struct drm_i915_private *dev_priv)
+void i915_gem_init_early(struct drm_i915_private *i915)
{
- i915_gem_init__mm(dev_priv);
+ i915_gem_init__mm(i915);
- spin_lock_init(&dev_priv->fb_tracking.lock);
+ spin_lock_init(&i915->fb_tracking.lock);
+
+ spin_lock_init(&i915->clients.idr_lock);
+ idr_init(&i915->clients.idr);
}
void i915_gem_cleanup_early(struct drm_i915_private *dev_priv)
@@ -1518,6 +1521,106 @@ int i915_gem_freeze_late(struct drm_i915_private *i915)
return 0;
}
+static ssize_t
+show_client_name(struct device *kdev, struct device_attribute *attr, char *buf)
+{
+ struct drm_i915_file_private *file_priv =
+ container_of(attr, struct drm_i915_file_private,
+ client.attr.name);
+
+ return snprintf(buf, PAGE_SIZE, "%s", file_priv->client.name);
+}
+
+static ssize_t
+show_client_pid(struct device *kdev, struct device_attribute *attr, char *buf)
+{
+ struct drm_i915_file_private *file_priv =
+ container_of(attr, struct drm_i915_file_private,
+ client.attr.pid);
+
+ return snprintf(buf, PAGE_SIZE, "%u", pid_nr(file_priv->client.pid));
+}
+
+static int
+i915_gem_add_client(struct drm_i915_private *i915,
+ struct drm_i915_file_private *file_priv,
+ struct task_struct *task,
+ unsigned int serial)
+{
+ struct i915_drm_client *client = &file_priv->client;
+ struct i915_drm_clients *clients = &i915->clients;
+ struct device_attribute *attr;
+ int ret = -ENOMEM;
+ char id[32];
+
+ if (!clients->root)
+ return 0; /* intel_fbdev_init registers a client before sysfs */
+
+ client->name = kstrdup(task->comm, GFP_KERNEL);
+ if (!client->name)
+ goto err_name;
+
+ snprintf(id, sizeof(id), "%u", serial);
+ client->root = kobject_create_and_add(id, clients->root);
+ if (!client->root)
+ goto err_client;
+
+ attr = &client->attr.name;
+ sysfs_attr_init(&attr->attr);
+ attr->attr.name = "name";
+ attr->attr.mode = 0444;
+ attr->show = show_client_name;
+
+ ret = sysfs_create_file(client->root, (struct attribute *)attr);
+ if (ret)
+ goto err_attr_name;
+
+ attr = &client->attr.pid;
+ sysfs_attr_init(&attr->attr);
+ attr->attr.name = "pid";
+ attr->attr.mode = 0444;
+ attr->show = show_client_pid;
+
+ ret = sysfs_create_file(client->root, (struct attribute *)attr);
+ if (ret)
+ goto err_attr_pid;
+
+ client->id = serial;
+ client->pid = get_task_pid(task, PIDTYPE_PID);
+
+ return 0;
+
+err_attr_pid:
+ sysfs_remove_file(client->root, (struct attribute *)&client->attr.name);
+err_attr_name:
+ kobject_put(client->root);
+err_client:
+ kfree(client->name);
+err_name:
+ return ret;
+}
+
+static void i915_gem_remove_client(struct drm_i915_file_private *file_priv)
+{
+ struct i915_drm_clients *clients = &file_priv->dev_priv->clients;
+ struct i915_drm_client *client = &file_priv->client;
+
+ if (!client->name)
+ return; /* intel_fbdev_init registers a client before sysfs */
+
+ sysfs_remove_file(client->root, (struct attribute *)&client->attr.pid);
+ sysfs_remove_file(client->root, (struct attribute *)&client->attr.name);
+ kobject_put(client->root);
+
+ spin_lock(&clients->idr_lock);
+ idr_remove(&clients->idr, client->id);
+ spin_unlock(&clients->idr_lock);
+
+ put_pid(client->pid);
+
+ kfree(client->name);
+}
+
void i915_gem_release(struct drm_device *dev, struct drm_file *file)
{
struct drm_i915_file_private *file_priv = file->driver_priv;
@@ -1531,33 +1634,58 @@ void i915_gem_release(struct drm_device *dev, struct drm_file *file)
list_for_each_entry(request, &file_priv->mm.request_list, client_link)
request->file_priv = NULL;
spin_unlock(&file_priv->mm.lock);
+
+ i915_gem_remove_client(file_priv);
}
int i915_gem_open(struct drm_i915_private *i915, struct drm_file *file)
{
+ struct i915_drm_clients *clients = &i915->clients;
struct drm_i915_file_private *file_priv;
- int ret;
+ int ret = -ENOMEM;
+ int id;
DRM_DEBUG("\n");
file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL);
if (!file_priv)
- return -ENOMEM;
+ goto err_alloc;
+
+ spin_lock(&clients->idr_lock);
+ id = idr_alloc_cyclic(&clients->idr, file_priv, 0, -1, GFP_KERNEL);
+ spin_unlock(&clients->idr_lock);
+ if (id < 0)
+ goto err_alloc;
+
+ ret = i915_gem_add_client(i915, file_priv, current, id);
+ if (ret)
+ goto err_client;
file->driver_priv = file_priv;
+ ret = i915_gem_context_open(i915, file);
+ if (ret)
+ goto err_context;
+
file_priv->dev_priv = i915;
file_priv->file = file;
+ file_priv->bsd_engine = -1;
+ file_priv->hang_timestamp = jiffies;
spin_lock_init(&file_priv->mm.lock);
INIT_LIST_HEAD(&file_priv->mm.request_list);
- file_priv->bsd_engine = -1;
- file_priv->hang_timestamp = jiffies;
+ return 0;
- ret = i915_gem_context_open(i915, file);
- if (ret)
- kfree(file_priv);
+err_context:
+ i915_gem_remove_client(file_priv);
+
+err_client:
+ spin_lock(&clients->idr_lock);
+ idr_remove(&clients->idr, id);
+ spin_unlock(&clients->idr_lock);
+ kfree(file_priv);
+err_alloc:
return ret;
}
diff --git a/drivers/gpu/drm/i915/i915_sysfs.c b/drivers/gpu/drm/i915/i915_sysfs.c
index ad2b1b833d7b..3ab50e29fddf 100644
--- a/drivers/gpu/drm/i915/i915_sysfs.c
+++ b/drivers/gpu/drm/i915/i915_sysfs.c
@@ -559,6 +559,11 @@ void i915_setup_sysfs(struct drm_i915_private *dev_priv)
struct device *kdev = dev_priv->drm.primary->kdev;
int ret;
+ dev_priv->clients.root =
+ kobject_create_and_add("clients", &kdev->kobj);
+ if (!dev_priv->clients.root)
+ DRM_ERROR("Per-client sysfs setup failed\n");
+
#ifdef CONFIG_PM
if (HAS_RC6(dev_priv)) {
ret = sysfs_merge_group(&kdev->kobj,
@@ -619,4 +624,7 @@ void i915_teardown_sysfs(struct drm_i915_private *dev_priv)
sysfs_unmerge_group(&kdev->kobj, &rc6_attr_group);
sysfs_unmerge_group(&kdev->kobj, &rc6p_attr_group);
#endif
+
+ if (dev_priv->clients.root)
+ kobject_put(dev_priv->clients.root);
}
--
2.20.1
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