[RFC 2/8] drm/i915: Make GEM contexts track DRM clients

[Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>]

From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

Make GEM contexts keep a reference to i915_drm_client for the whole of
of their lifetime which will come handy in following patches.

v2: Don't bother supporting selftests contexts from debugfs. (Chris)
v3 (Lucas): Finish constructing ctx before adding it to the list
v4 (Ram): Rebase.
v5: Trivial rebase for proto ctx changes.
v6: Rebase after clients no longer track name and pid.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> # v5
Reviewed-by: Aravind Iddamsetty <aravind.iddamsetty@intel.com> # v5
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gem/i915_gem_context.c       | 5 +++++
 drivers/gpu/drm/i915/gem/i915_gem_context_types.h | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index fd169cf2f75a..667b5f3e9616 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -993,6 +993,9 @@ void i915_gem_context_release(struct kref *ref)
 	trace_i915_context_free(ctx);
 	GEM_BUG_ON(!i915_gem_context_is_closed(ctx));
 
+	if (ctx->client)
+		i915_drm_client_put(ctx->client);
+
 	mutex_destroy(&ctx->engines_mutex);
 	mutex_destroy(&ctx->lut_mutex);
 
@@ -1398,6 +1401,8 @@ static void gem_context_register(struct i915_gem_context *ctx,
 	ctx->file_priv = fpriv;
 
 	ctx->pid = get_task_pid(current, PIDTYPE_PID);
+	ctx->client = i915_drm_client_get(fpriv->client);
+
 	snprintf(ctx->name, sizeof(ctx->name), "%s[%d]",
 		 current->comm, pid_nr(ctx->pid));
 
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 94c03a97cb77..e1bca913818e 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
@@ -277,6 +277,9 @@ struct i915_gem_context {
 	/** @link: place with &drm_i915_private.context_list */
 	struct list_head link;
 
+	/** @client: struct i915_drm_client */
+	struct i915_drm_client *client;
+
 	/**
 	 * @ref: reference count
 	 *
-- 
2.30.2