[PATCH 27/34] drm/i915: Create a global list of vms

[Ben Widawsky <ben@bwidawsk.net>]

After we plumb our code to support multiple address spaces (VMs), there
are a few situations where we want to be able to traverse the list of
all address spaces in the system. Cases like eviction, or error state
collection are obvious example.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_drv.h | 2 ++
 drivers/gpu/drm/i915/i915_gem.c | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index ccdf80d..31bd475 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -403,6 +403,7 @@ typedef uint32_t gen6_gtt_pte_t;
 struct i915_address_space {
 	struct drm_mm mm;
 	struct drm_device *dev;
+	struct list_head global_link;
 	unsigned long start;		/* Start offset always 0 for dri2 */
 	size_t total;		/* size addr space maps (ex. 2GB for ggtt) */
 
@@ -1045,6 +1046,7 @@ typedef struct drm_i915_private {
 	enum modeset_restore modeset_restore;
 	struct mutex modeset_restore_lock;
 
+	struct list_head vm_list; /* Global list of all address spaces */
 	struct i915_gtt gtt; /* VMA representing the global address space */
 
 	struct i915_gem_mm mm;
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index eed2ef6..572b386 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4196,6 +4196,10 @@ i915_gem_load(struct drm_device *dev)
 				  SLAB_HWCACHE_ALIGN,
 				  NULL);
 
+	INIT_LIST_HEAD(&dev_priv->vm_list);
+	INIT_LIST_HEAD(&i915_gtt_vm->global_link);
+	list_add(&i915_gtt_vm->global_link, &dev_priv->vm_list);
+
 	INIT_LIST_HEAD(&i915_gtt_vm->active_list);
 	INIT_LIST_HEAD(&i915_gtt_vm->inactive_list);
 	INIT_LIST_HEAD(&dev_priv->mm.unbound_list);
-- 
1.8.2.3