[Intel-gfx] [RFC 07/10] drm/i915: Track all user contexts per client

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursu...@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.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursu...@intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_context.c       | 8 ++++++++
 drivers/gpu/drm/i915/gem/i915_gem_context_types.h | 3 +++
 drivers/gpu/drm/i915/i915_drm_client.c            | 3 +++
 drivers/gpu/drm/i915/i915_drm_client.h            | 5 +++++
 4 files changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c 
b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index 36dc577a23c4..f29ca3583ca9 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -319,6 +319,10 @@ static void i915_gem_context_free(struct i915_gem_context 
*ctx)
        if (client) {
                unsigned int i;
 
+               spin_lock(&client->ctx_lock);
+               list_del_rcu(&ctx->client_link);
+               spin_unlock(&client->ctx_lock);
+
                /* Transfer accumulated runtime to the parent drm client. */
                BUILD_BUG_ON(ARRAY_SIZE(client->past_runtime) !=
                             ARRAY_SIZE(ctx->past_runtime));
@@ -952,6 +956,10 @@ 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);
+
        return 0;
 
 err:
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 f0d7441aafc8..255fcc469d9b 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
@@ -103,6 +103,9 @@ 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 418fe2c8b605..95738b8533cc 100644
--- a/drivers/gpu/drm/i915/i915_drm_client.c
+++ b/drivers/gpu/drm/i915/i915_drm_client.c
@@ -156,6 +156,9 @@ 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;
 
        ret = xa_alloc_cyclic(&clients->xarray, &client->id, client,
diff --git a/drivers/gpu/drm/i915/i915_drm_client.h 
b/drivers/gpu/drm/i915/i915_drm_client.h
index 72e66027e0f1..3c3ecc2d1f87 100644
--- a/drivers/gpu/drm/i915/i915_drm_client.h
+++ b/drivers/gpu/drm/i915/i915_drm_client.h
@@ -10,10 +10,12 @@
 #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"
@@ -37,6 +39,9 @@ struct i915_drm_client {
        char __rcu *name;
        bool closed;
 
+       spinlock_t ctx_lock;
+       struct list_head ctx_list;
+
        struct i915_drm_clients *clients;
 
        struct kobject *root;
-- 
2.20.1

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