drm/i915: Remove defunct i915->vm_list

No longer used and can be removed. One less global that currently
demands struct_mutex protection.

References: e9e7dc4144cd ("drm/i915/gtt: Make gen6 page directories evictable")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180705065653.20449-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_drv.h

@@ -1744,7 +1744,6 @@ struct drm_i915_private {
 	struct drm_atomic_state *modeset_restore_state;
 	struct drm_modeset_acquire_ctx reset_ctx;
 
-	struct list_head vm_list; /* Global list of all address spaces */
 	struct i915_ggtt ggtt; /* VM representing the global address space */
 
 	struct i915_gem_mm mm;

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -540,8 +540,6 @@ static void i915_address_space_init(struct i915_address_space *vm,
 	INIT_LIST_HEAD(&vm->active_list);
 	INIT_LIST_HEAD(&vm->inactive_list);
 	INIT_LIST_HEAD(&vm->unbound_list);
-
-	list_add_tail(&vm->global_link, &dev_priv->vm_list);
 }
 
 static void i915_address_space_fini(struct i915_address_space *vm)
@@ -553,7 +551,6 @@ static void i915_address_space_fini(struct i915_address_space *vm)
 	spin_unlock(&vm->free_pages.lock);
 
 	drm_mm_takedown(&vm->mm);
-	list_del(&vm->global_link);
 }
 
 static int __setup_page_dma(struct i915_address_space *vm,
@@ -3572,8 +3569,6 @@ int i915_ggtt_init_hw(struct drm_i915_private *dev_priv)
 
 	stash_init(&dev_priv->mm.wc_stash);
 
-	INIT_LIST_HEAD(&dev_priv->vm_list);
-
 	/* Note that we use page colouring to enforce a guard page at the
 	 * end of the address space. This is required as the CS may prefetch
 	 * beyond the end of the batch buffer, across the page boundary,

drivers/gpu/drm/i915/i915_gem_gtt.h

@@ -288,7 +288,6 @@ struct i915_address_space {
 	 * assign blame.
 	 */
 	struct drm_i915_file_private *file;
-	struct list_head global_link;
 	u64 total;		/* size addr space maps (ex. 2GB for ggtt) */
 	u64 reserved;		/* size addr space reserved */
 

drivers/gpu/drm/i915/selftests/mock_gtt.c

@@ -74,7 +74,6 @@ mock_ppgtt(struct drm_i915_private *i915,
 	INIT_LIST_HEAD(&ppgtt->vm.inactive_list);
 	INIT_LIST_HEAD(&ppgtt->vm.unbound_list);
 
-	INIT_LIST_HEAD(&ppgtt->vm.global_link);
 	drm_mm_init(&ppgtt->vm.mm, 0, ppgtt->vm.total);
 
 	ppgtt->vm.clear_range = nop_clear_range;
@@ -106,8 +105,6 @@ void mock_init_ggtt(struct drm_i915_private *i915)
 {
 	struct i915_ggtt *ggtt = &i915->ggtt;
 
-	INIT_LIST_HEAD(&i915->vm_list);
-
 	ggtt->vm.i915 = i915;
 
 	ggtt->gmadr = (struct resource) DEFINE_RES_MEM(0, 2048 * PAGE_SIZE);