drm/i915: Keep a list of all contexts

I have implemented this patch before without creating a separate list
(I'm having trouble finding the links, but the messages ids are:
<1364942743-6041-2-git-send-email-ben@bwidawsk.net>
<1365118914-15753-9-git-send-email-ben@bwidawsk.net>)

However, the code is much simpler to just use a list and it makes the
code from the next patch a lot more pretty.

As you'll see in the next patch, the reason for this is to be able to
specify when a context needs to get L3 remapping. More details there.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

4 files changed, 16 insertions, 6 deletions

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 1d776243bf55..ada095023dad 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1442,6 +1442,7 @@ static int i915_context_status(struct seq_file *m, void *unused)
         struct drm_device *dev = node->minor->dev;
         drm_i915_private_t *dev_priv = dev->dev_private;
         struct intel_ring_buffer *ring;
+        struct i915_hw_context *ctx;
         int ret, i;
 
         ret = mutex_lock_interruptible(&dev->mode_config.mutex);
@@ -1460,12 +1461,14 @@ static int i915_context_status(struct seq_file *m, void *unused)
                 seq_putc(m, '\n');
         }
 
-        for_each_ring(ring, dev_priv, i) {
-                if (ring->default_context) {
-                        seq_printf(m, "HW default context %s ", ring->name);
-                        describe_obj(m, ring->default_context->obj);
-                        seq_putc(m, '\n');
-                }
+        list_for_each_entry(ctx, &dev_priv->context_list, link) {
+                seq_puts(m, "HW context ");
+                for_each_ring(ring, dev_priv, i)
+                        if (ring->default_context == ctx)
+                                seq_printf(m, "(default context %s) ", ring->name);
+
+                describe_obj(m, ctx->obj);
+                seq_putc(m, '\n');
         }
 
         mutex_unlock(&dev->mode_config.mutex);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 0c39805b881e..179592762537 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -605,6 +605,8 @@ struct i915_hw_context {
         struct intel_ring_buffer *ring;
         struct drm_i915_gem_object *obj;
         struct i915_ctx_hang_stats hang_stats;
+
+        struct list_head link;
 };
 
 struct i915_fbc {
@@ -1343,6 +1345,7 @@ typedef struct drm_i915_private {
 
         bool hw_contexts_disabled;
         uint32_t hw_context_size;
+        struct list_head context_list;
 
         u32 fdi_rx_config;
 
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index e4f17e594703..83464aae909f 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4541,6 +4541,7 @@ i915_gem_load(struct drm_device *dev)
         INIT_LIST_HEAD(&dev_priv->vm_list);
         i915_init_vm(dev_priv, &dev_priv->gtt.base);
 
+        INIT_LIST_HEAD(&dev_priv->context_list);
         INIT_LIST_HEAD(&dev_priv->mm.unbound_list);
         INIT_LIST_HEAD(&dev_priv->mm.bound_list);
         INIT_LIST_HEAD(&dev_priv->mm.fence_list);
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 26c3fccc9599..2bbdce821ac3 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -129,6 +129,7 @@ void i915_gem_context_free(struct kref *ctx_ref)
         struct i915_hw_context *ctx = container_of(ctx_ref,
                                                    typeof(*ctx), ref);
 
+        list_del(&ctx->link);
         drm_gem_object_unreference(&ctx->obj->base);
         kfree(ctx);
 }
@@ -147,6 +148,7 @@ create_hw_context(struct drm_device *dev,
 
         kref_init(&ctx->ref);
         ctx->obj = i915_gem_alloc_object(dev, dev_priv->hw_context_size);
+        INIT_LIST_HEAD(&ctx->link);
         if (ctx->obj == NULL) {
                 kfree(ctx);
                 DRM_DEBUG_DRIVER("Context object allocated failed\n");
@@ -166,6 +168,7 @@ create_hw_context(struct drm_device *dev,
          * assertion in the context switch code.
          */
         ctx->ring = &dev_priv->ring[RCS];
+        list_add_tail(&ctx->link, &dev_priv->context_list);
 
         /* Default context will never have a file_priv */
         if (file_priv == NULL)