drm/i915: Create a global list of vms

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.

v2: Delete the global link instead of the list head. While this in and
of itself shouldn't be really be a problem, doing this allows us to WARN
on an non-empty list, which is a problem. (Daniel)

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 5dd4fa5..fd52de7 100644 (file)
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1492,6 +1492,10 @@ 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;
@@ -1758,6 +1762,8 @@ int i915_driver_unload(struct drm_device *dev)
                        i915_free_hws(dev);
        }
 
+       list_del(&dev_priv->gtt.base.global_link);
+       WARN_ON(!list_empty(&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 7839b3a..1e1664e 100644 (file)
--- 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;