drm/i915: Extend debugfs/i915_drop_caches to call i915_gem_shrink_all()

Sometimes we want to explicitly page out all available objects from igt,
i.e. call i915_gem_shrink_all() and check that subsequent operations
succeed. This adds DROP_SHRINK_ALL [0x8] to the set of flags for
debugfs/i915_drop_caches for that purpose.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170308144622.23194-1-chris@chris-wilson.co.uk
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 115433d..56674df 100644 (file)
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -4231,11 +4231,13 @@ DEFINE_SIMPLE_ATTRIBUTE(i915_ring_test_irq_fops,
 #define DROP_RETIRE 0x4
 #define DROP_ACTIVE 0x8
 #define DROP_FREED 0x10
+#define DROP_SHRINK_ALL 0x20
 #define DROP_ALL (DROP_UNBOUND | \
                  DROP_BOUND    | \
                  DROP_RETIRE   | \
                  DROP_ACTIVE   | \
-                 DROP_FREED)
+                 DROP_FREED    | \
+                 DROP_SHRINK_ALL)
 static int
 i915_drop_caches_get(void *data, u64 *val)
 {
@@ -4276,6 +4278,9 @@ i915_drop_caches_set(void *data, u64 val)
        if (val & DROP_UNBOUND)
                i915_gem_shrink(dev_priv, LONG_MAX, I915_SHRINK_UNBOUND);
 
+       if (val & DROP_SHRINK_ALL)
+               i915_gem_shrink_all(dev_priv);
+
 unlock:
        mutex_unlock(&dev->struct_mutex);