[Intel-gfx] [PATCH 03/11] drm/i915: Create a global list of vms

[Ben Widawsky]

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 at bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_dma.c | 5 +++++
 drivers/gpu/drm/i915/i915_drv.h | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 3ac9dcc..d13e21f 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1497,6 +1497,10 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
 
 	i915_dump_device_info(dev_priv);
 
+	INIT_LIST_HEAD(&dev_priv->vm_list);
+	INIT_LIST_HEAD(&dev_priv->gtt.base.global_link);
+	list_add(&dev_priv->gtt.base.global_link, &dev_priv->vm_list);
+
 	if (i915_get_bridge_dev(dev)) {
 		ret = -EIO;
 		goto free_priv;
@@ -1754,6 +1758,7 @@ int i915_driver_unload(struct drm_device *dev)
 			i915_free_hws(dev);
 	}
 
+	list_del(&dev_priv->vm_list);
 	drm_mm_takedown(&dev_priv->gtt.base.mm);
 	if (dev_priv->regs != NULL)
 		pci_iounmap(dev->pdev, dev_priv->regs);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 1296565..997c9a5 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -449,6 +449,7 @@ 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) */
 
@@ -1120,6 +1121,7 @@ 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;
-- 
1.8.3.2