[Intel-gfx] [PATCH 3/7] drm/i915: Make object aware that it backs a context

[Ben Widawsky]

It's really simple to keep track of objects which back the context.
Doing so allows will be really helpful in properly refcounting contexts

Daniel: please see the last patch in the series before commenting on
this patch. I'm open to other ideas, but this seems like the simplest
way to do it, and storing the context info in the object has never been
offensive to me.

Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_debugfs.c     | 11 ++++++++++-
 drivers/gpu/drm/i915/i915_drv.h         |  2 ++
 drivers/gpu/drm/i915/i915_gem_context.c |  2 ++
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 7df8351..375c36a 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -90,6 +90,14 @@ static const char *get_tiling_flag(struct drm_i915_gem_object *obj)
 	}
 }
 
+static const char *get_context_flag(struct drm_i915_gem_object *obj)
+{
+	if (obj->ctx)
+		return "c";
+	else
+		return " ";
+}
+
 static const char *cache_level_str(int type)
 {
 	switch (type) {
@@ -103,10 +111,11 @@ static const char *cache_level_str(int type)
 static void
 describe_obj(struct seq_file *m, struct drm_i915_gem_object *obj)
 {
-	seq_printf(m, "%p: %s%s %8zdKiB %02x %02x %d %d %d%s%s%s",
+	seq_printf(m, "%p: %s%s%s %8zdKiB %02x %02x %d %d %d%s%s%s",
 		   &obj->base,
 		   get_pin_flag(obj),
 		   get_tiling_flag(obj),
+		   get_context_flag(obj),
 		   obj->base.size / 1024,
 		   obj->base.read_domains,
 		   obj->base.write_domain,
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 1657d873..da071a0 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1214,6 +1214,8 @@ struct drm_i915_gem_object {
 
 	/** for phy allocated objects */
 	struct drm_i915_gem_phys_object *phys_obj;
+
+	struct i915_hw_context *ctx;
 };
 #define to_gem_object(obj) (&((struct drm_i915_gem_object *)(obj))->base)
 
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 6211637..8e218ad 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -150,6 +150,8 @@ create_hw_context(struct drm_device *dev,
 		return ERR_PTR(-ENOMEM);
 	}
 
+	ctx->obj->ctx = ctx;
+
 	/* The ring associated with the context object is handled by the normal
 	 * object tracking code. We give an initial ring value simple to pass an
 	 * assertion in the context switch code.
-- 
1.8.2