[RFC 3/8] drm/i915: Make GEM contexts track DRM clients

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursu...@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.ursu...@intel.com>
Reviewed-by: Chris Wilson <ch...@chris-wilson.co.uk> # v5
Reviewed-by: Aravind Iddamsetty <aravind.iddamse...@intel.com> # v5
Signed-off-by: Chris Wilson <ch...@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 8208fd5b72c3..9296d69681d7 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -956,6 +956,9 @@ static void i915_gem_context_release_work(struct 
work_struct *work)
        if (vm)
                i915_vm_put(vm);
 
+       if (ctx->client)
+               i915_drm_client_put(ctx->client);
+
        mutex_destroy(&ctx->engines_mutex);
        mutex_destroy(&ctx->lut_mutex);
 
@@ -1373,6 +1376,8 @@ 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 c4617e4d9fa9..598c57ac5cdf 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