drm/i915: Exercise filling and removing random ranges from the live GTT

Test the low-level i915_address_space interfaces to sanity check the
live insertion/removal of address ranges.

v2: Split out the low-level operations to a new test

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170213171558.20942-31-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
index 7384540..c4ed0fd 100644 (file)
--- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
@@ -26,6 +26,7 @@
 #include <linux/prime_numbers.h>
 
 #include "../i915_selftest.h"
+#include "i915_random.h"
 
 #include "mock_drm.h"
 
@@ -490,6 +491,106 @@ err:
        return 0;
 }
 
+static int drunk_hole(struct drm_i915_private *i915,
+                     struct i915_address_space *vm,
+                     u64 hole_start, u64 hole_end,
+                     unsigned long end_time)
+{
+       I915_RND_STATE(prng);
+       unsigned int size;
+       unsigned long flags;
+
+       flags = PIN_OFFSET_FIXED | PIN_USER;
+       if (i915_is_ggtt(vm))
+               flags |= PIN_GLOBAL;
+
+       /* Keep creating larger objects until one cannot fit into the hole */
+       for (size = 12; (hole_end - hole_start) >> size; size++) {
+               struct drm_i915_gem_object *obj;
+               unsigned int *order, count, n;
+               struct i915_vma *vma;
+               u64 hole_size;
+               int err;
+
+               hole_size = (hole_end - hole_start) >> size;
+               if (hole_size > KMALLOC_MAX_SIZE / sizeof(u32))
+                       hole_size = KMALLOC_MAX_SIZE / sizeof(u32);
+               count = hole_size;
+               do {
+                       count >>= 1;
+                       order = i915_random_order(count, &prng);
+               } while (!order && count);
+               if (!order)
+                       break;
+
+               /* Ignore allocation failures (i.e. don't report them as
+                * a test failure) as we are purposefully allocating very
+                * large objects without checking that we have sufficient
+                * memory. We expect to hit -ENOMEM.
+                */
+
+               obj = fake_dma_object(i915, BIT_ULL(size));
+               if (IS_ERR(obj)) {
+                       kfree(order);
+                       break;
+               }
+
+               vma = i915_vma_instance(obj, vm, NULL);
+               if (IS_ERR(vma)) {
+                       err = PTR_ERR(vma);
+                       goto err_obj;
+               }
+
+               GEM_BUG_ON(vma->size != BIT_ULL(size));
+
+               for (n = 0; n < count; n++) {
+                       u64 addr = hole_start + order[n] * BIT_ULL(size);
+
+                       err = i915_vma_pin(vma, 0, 0, addr | flags);
+                       if (err) {
+                               pr_err("%s failed to pin object at %llx + %llx in hole [%llx - %llx], with err=%d\n",
+                                      __func__,
+                                      addr, BIT_ULL(size),
+                                      hole_start, hole_end,
+                                      err);
+                               goto err;
+                       }
+
+                       if (!drm_mm_node_allocated(&vma->node) ||
+                           i915_vma_misplaced(vma, 0, 0, addr | flags)) {
+                               pr_err("%s incorrect at %llx + %llx\n",
+                                      __func__, addr, BIT_ULL(size));
+                               i915_vma_unpin(vma);
+                               err = i915_vma_unbind(vma);
+                               err = -EINVAL;
+                               goto err;
+                       }
+
+                       i915_vma_unpin(vma);
+                       err = i915_vma_unbind(vma);
+                       GEM_BUG_ON(err);
+
+                       if (igt_timeout(end_time,
+                                       "%s timed out after %d/%d\n",
+                                       __func__, n, count)) {
+                               err = -EINTR;
+                               goto err;
+                       }
+               }
+
+err:
+               if (!i915_vma_is_ggtt(vma))
+                       i915_vma_close(vma);
+err_obj:
+               i915_gem_object_put(obj);
+               kfree(order);
+               if (err)
+                       return err;
+       }
+
+       return 0;
+}
+
 static int exercise_ppgtt(struct drm_i915_private *dev_priv,
                          int (*func)(struct drm_i915_private *i915,
                                      struct i915_address_space *vm,
@@ -538,6 +639,11 @@ static int igt_ppgtt_walk(void *arg)
        return exercise_ppgtt(arg, walk_hole);
 }
 
+static int igt_ppgtt_drunk(void *arg)
+{
+       return exercise_ppgtt(arg, drunk_hole);
+}
+
 static int sort_holes(void *priv, struct list_head *A, struct list_head *B)
 {
        struct drm_mm_node *a = list_entry(A, typeof(*a), hole_stack);
@@ -597,12 +703,19 @@ static int igt_ggtt_walk(void *arg)
        return exercise_ggtt(arg, walk_hole);
 }
 
+static int igt_ggtt_drunk(void *arg)
+{
+       return exercise_ggtt(arg, drunk_hole);
+}
+
 int i915_gem_gtt_live_selftests(struct drm_i915_private *i915)
 {
        static const struct i915_subtest tests[] = {
                SUBTEST(igt_ppgtt_alloc),
+               SUBTEST(igt_ppgtt_drunk),
                SUBTEST(igt_ppgtt_walk),
                SUBTEST(igt_ppgtt_fill),
+               SUBTEST(igt_ggtt_drunk),
                SUBTEST(igt_ggtt_walk),
                SUBTEST(igt_ggtt_fill),
        };