[Intel-gfx] [RFC 01/12] drm/i915: Expose list of clients in sysfs
Tvrtko Ursulin
tvrtko.ursulin at linux.intel.com
Mon Mar 9 18:31:18 UTC 2020
From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
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.
v6:
* Use xa_alloc_cyclic to simplify locking. (Chris)
* No need to unregister individial sysfs files. (Chris)
* Rebase on top of fpriv kref.
* Track client closed status and reflect in sysfs.
v7:
* Make drm_client more standalone concept.
v8:
* Simplify sysfs show. (Chris)
* Always track name and pid.
v9:
* Fix cyclic id assignment.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
drivers/gpu/drm/i915/Makefile | 3 +-
drivers/gpu/drm/i915/i915_drm_client.c | 155 +++++++++++++++++++++++++
drivers/gpu/drm/i915/i915_drm_client.h | 64 ++++++++++
drivers/gpu/drm/i915/i915_drv.h | 5 +
drivers/gpu/drm/i915/i915_gem.c | 37 ++++--
drivers/gpu/drm/i915/i915_sysfs.c | 8 ++
6 files changed, 264 insertions(+), 8 deletions(-)
create mode 100644 drivers/gpu/drm/i915/i915_drm_client.c
create mode 100644 drivers/gpu/drm/i915/i915_drm_client.h
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 9f887a86e555..c6fc0f258ce3 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -36,7 +36,8 @@ subdir-ccflags-y += -I$(srctree)/$(src)
# Please keep these build lists sorted!
# core driver code
-i915-y += i915_drv.o \
+i915-y += i915_drm_client.o \
+ i915_drv.o \
i915_irq.o \
i915_getparam.o \
i915_params.o \
diff --git a/drivers/gpu/drm/i915/i915_drm_client.c b/drivers/gpu/drm/i915/i915_drm_client.c
new file mode 100644
index 000000000000..fbba9667aa7e
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_drm_client.c
@@ -0,0 +1,155 @@
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright © 2020 Intel Corporation
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#include "i915_drm_client.h"
+#include "i915_gem.h"
+#include "i915_utils.h"
+
+static ssize_t
+show_client_name(struct device *kdev, struct device_attribute *attr, char *buf)
+{
+ struct i915_drm_client *client =
+ container_of(attr, typeof(*client), attr.name);
+
+ return snprintf(buf, PAGE_SIZE,
+ client->closed ? "<%s>" : "%s",
+ client->name);
+}
+
+static ssize_t
+show_client_pid(struct device *kdev, struct device_attribute *attr, char *buf)
+{
+ struct i915_drm_client *client =
+ container_of(attr, typeof(*client), attr.pid);
+
+ return snprintf(buf, PAGE_SIZE,
+ client->closed ? "<%u>" : "%u",
+ pid_nr(client->pid));
+}
+
+static int
+__i915_drm_client_register(struct i915_drm_client *client,
+ struct task_struct *task)
+{
+ struct i915_drm_clients *clients = client->clients;
+ struct device_attribute *attr;
+ int ret = -ENOMEM;
+ char idstr[32];
+
+ client->pid = get_task_pid(task, PIDTYPE_PID);
+
+ client->name = kstrdup(task->comm, GFP_KERNEL);
+ if (!client->name)
+ goto err_name;
+
+ if (!clients->root)
+ return 0; /* intel_fbdev_init registers a client before sysfs */
+
+ snprintf(idstr, sizeof(idstr), "%u", client->id);
+ client->root = kobject_create_and_add(idstr, 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;
+
+ 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;
+
+ return 0;
+
+err_attr:
+ kobject_put(client->root);
+err_client:
+ kfree(client->name);
+err_name:
+ put_pid(client->pid);
+
+ return ret;
+}
+
+static void
+__i915_drm_client_unregister(struct i915_drm_client *client)
+{
+ put_pid(fetch_and_zero(&client->pid));
+ kfree(fetch_and_zero(&client->name));
+
+ if (!client->root)
+ return; /* fbdev client or error during drm open */
+
+ kobject_put(fetch_and_zero(&client->root));
+}
+
+struct i915_drm_client *
+i915_drm_client_add(struct i915_drm_clients *clients, struct task_struct *task)
+{
+ struct i915_drm_client *client;
+ int ret;
+
+ client = kzalloc(sizeof(*client), GFP_KERNEL);
+ if (!client)
+ return ERR_PTR(-ENOMEM);
+
+ kref_init(&client->kref);
+ client->clients = clients;
+
+ ret = mutex_lock_interruptible(&clients->lock);
+ if (ret)
+ goto err_id;
+ ret = xa_alloc_cyclic(&clients->xarray, &client->id, client,
+ xa_limit_32b, &clients->next_id, GFP_KERNEL);
+ mutex_unlock(&clients->lock);
+ if (ret)
+ goto err_id;
+
+ ret = __i915_drm_client_register(client, task);
+ if (ret)
+ goto err_register;
+
+ return client;
+
+err_register:
+ xa_erase(&clients->xarray, client->id);
+err_id:
+ kfree(client);
+
+ return ERR_PTR(ret);
+}
+
+void __i915_drm_client_free(struct kref *kref)
+{
+ struct i915_drm_client *client =
+ container_of(kref, typeof(*client), kref);
+
+ __i915_drm_client_unregister(client);
+ xa_erase(&client->clients->xarray, client->id);
+ kfree_rcu(client, rcu);
+}
+
+void i915_drm_client_close(struct i915_drm_client *client)
+{
+ GEM_BUG_ON(client->closed);
+ client->closed = true;
+ i915_drm_client_put(client);
+}
diff --git a/drivers/gpu/drm/i915/i915_drm_client.h b/drivers/gpu/drm/i915/i915_drm_client.h
new file mode 100644
index 000000000000..fb5979ec92d7
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_drm_client.h
@@ -0,0 +1,64 @@
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright © 2020 Intel Corporation
+ */
+
+#ifndef __I915_DRM_CLIENT_H__
+#define __I915_DRM_CLIENT_H__
+
+#include <linux/device.h>
+#include <linux/kobject.h>
+#include <linux/kref.h>
+#include <linux/pid.h>
+#include <linux/rcupdate.h>
+#include <linux/sched.h>
+#include <linux/xarray.h>
+
+struct i915_drm_clients {
+ struct mutex lock;
+ struct xarray xarray;
+ u32 next_id;
+
+ struct kobject *root;
+};
+
+struct i915_drm_client {
+ struct kref kref;
+
+ struct rcu_head rcu;
+
+ unsigned int id;
+ struct pid *pid;
+ char *name;
+ bool closed;
+
+ struct i915_drm_clients *clients;
+
+ struct kobject *root;
+ struct {
+ struct device_attribute pid;
+ struct device_attribute name;
+ } attr;
+};
+
+static inline struct i915_drm_client *
+i915_drm_client_get(struct i915_drm_client *client)
+{
+ kref_get(&client->kref);
+ return client;
+}
+
+void __i915_drm_client_free(struct kref *kref);
+
+static inline void i915_drm_client_put(struct i915_drm_client *client)
+{
+ kref_put(&client->kref, __i915_drm_client_free);
+}
+
+void i915_drm_client_close(struct i915_drm_client *client);
+
+struct i915_drm_client *i915_drm_client_add(struct i915_drm_clients *clients,
+ struct task_struct *task);
+
+#endif /* !__I915_DRM_CLIENT_H__ */
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index c081f4ec87df..2eda21d730eb 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -91,6 +91,7 @@
#include "intel_wakeref.h"
#include "intel_wopcm.h"
+#include "i915_drm_client.h"
#include "i915_gem.h"
#include "i915_gem_fence_reg.h"
#include "i915_gem_gtt.h"
@@ -220,6 +221,8 @@ 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 *client;
};
/* Interface history:
@@ -1193,6 +1196,8 @@ struct drm_i915_private {
struct i915_pmu pmu;
+ struct i915_drm_clients 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 ca5420012a22..ec8734eb54eb 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1218,12 +1218,16 @@ 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__contexts(dev_priv);
+ i915_gem_init__mm(i915);
+ i915_gem_init__contexts(i915);
- spin_lock_init(&dev_priv->fb_tracking.lock);
+ spin_lock_init(&i915->fb_tracking.lock);
+
+ mutex_init(&i915->clients.lock);
+ i915->clients.next_id = 0;
+ xa_init_flags(&i915->clients.xarray, XA_FLAGS_ALLOC);
}
void i915_gem_cleanup_early(struct drm_i915_private *dev_priv)
@@ -1232,6 +1236,8 @@ void i915_gem_cleanup_early(struct drm_i915_private *dev_priv)
GEM_BUG_ON(!llist_empty(&dev_priv->mm.free_list));
GEM_BUG_ON(atomic_read(&dev_priv->mm.free_count));
drm_WARN_ON(&dev_priv->drm, dev_priv->mm.shrink_count);
+ drm_WARN_ON(&dev_priv->drm, !xa_empty(&dev_priv->clients.xarray));
+ xa_destroy(&dev_priv->clients.xarray);
}
int i915_gem_freeze(struct drm_i915_private *dev_priv)
@@ -1286,6 +1292,8 @@ void i915_gem_release(struct drm_device *dev, struct drm_file *file)
struct drm_i915_file_private *file_priv = file->driver_priv;
struct i915_request *request;
+ i915_drm_client_close(file_priv->client);
+
/* Clean up our request list when the client is going away, so that
* later retire_requests won't dereference our soon-to-be-gone
* file_priv.
@@ -1299,17 +1307,25 @@ void i915_gem_release(struct drm_device *dev, struct drm_file *file)
int i915_gem_open(struct drm_i915_private *i915, struct drm_file *file)
{
struct drm_i915_file_private *file_priv;
- int ret;
+ struct i915_drm_client *client;
+ int ret = -ENOMEM;
DRM_DEBUG("\n");
file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL);
if (!file_priv)
- return -ENOMEM;
+ goto err_alloc;
+
+ client = i915_drm_client_add(&i915->clients, current);
+ if (IS_ERR(client)) {
+ ret = PTR_ERR(client);
+ goto err_client;
+ }
file->driver_priv = file_priv;
file_priv->dev_priv = i915;
file_priv->file = file;
+ file_priv->client = client;
spin_lock_init(&file_priv->mm.lock);
INIT_LIST_HEAD(&file_priv->mm.request_list);
@@ -1319,8 +1335,15 @@ int i915_gem_open(struct drm_i915_private *i915, struct drm_file *file)
ret = i915_gem_context_open(i915, file);
if (ret)
- kfree(file_priv);
+ goto err_context;
+
+ return 0;
+err_context:
+ i915_drm_client_close(client);
+err_client:
+ 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 45d32ef42787..b7d4a6d2dd5c 100644
--- a/drivers/gpu/drm/i915/i915_sysfs.c
+++ b/drivers/gpu/drm/i915/i915_sysfs.c
@@ -560,6 +560,11 @@ 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,
@@ -627,4 +632,7 @@ 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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