drm: kselftest for drm_mm and range restricted eviction

Check that we add arbitrary blocks to a restrited eviction scanner in
order to find the first minimal hole that matches our request.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20161222083641.2691-16-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/selftests/drm_mm_selftests.h b/drivers/gpu/drm/selftests/drm_mm_selftests.h
index a31b445..965aca6 100644 (file)
--- a/drivers/gpu/drm/selftests/drm_mm_selftests.h
+++ b/drivers/gpu/drm/selftests/drm_mm_selftests.h
@@ -16,3 +16,4 @@ selftest(align, igt_align)
 selftest(align32, igt_align32)
 selftest(align64, igt_align64)
 selftest(evict, igt_evict)
+selftest(evict_range, igt_evict_range)

diff --git a/drivers/gpu/drm/selftests/test-drm_mm.c b/drivers/gpu/drm/selftests/test-drm_mm.c
index 065e2c7..d491151 100644 (file)
--- a/drivers/gpu/drm/selftests/test-drm_mm.c
+++ b/drivers/gpu/drm/selftests/test-drm_mm.c
@@ -1279,6 +1279,7 @@ static bool evict_everything(struct drm_mm *mm,
 }
 
 static int evict_something(struct drm_mm *mm,
+                          u64 range_start, u64 range_end,
                           struct evict_node *nodes,
                           unsigned int *order,
                           unsigned int count,
@@ -1291,7 +1292,9 @@ static int evict_something(struct drm_mm *mm,
        struct drm_mm_node tmp;
        int err;
 
-       drm_mm_init_scan(mm, size, alignment, 0);
+       drm_mm_init_scan_with_range(mm,
+                                   size, alignment, 0,
+                                   range_start, range_end);
        if (!evict_nodes(mm,
                         nodes, order, count,
                         &evict_list))
@@ -1309,6 +1312,12 @@ static int evict_something(struct drm_mm *mm,
                return err;
        }
 
+       if (tmp.start < range_start || tmp.start + tmp.size > range_end) {
+               pr_err("Inserted [address=%llu + %llu] did not fit into the request range [%llu, %llu]\n",
+                      tmp.start, tmp.size, range_start, range_end);
+               err = -EINVAL;
+       }
+
        if (!assert_node(&tmp, mm, size, alignment, 0) || tmp.hole_follows) {
                pr_err("Inserted did not fill the eviction hole: size=%lld [%d], align=%d [rem=%lld], start=%llx, hole-follows?=%d\n",
                       tmp.size, size,
@@ -1390,7 +1399,7 @@ static int igt_evict(void *ignored)
        for (mode = evict_modes; mode->name; mode++) {
                for (n = 1; n <= size; n <<= 1) {
                        drm_random_reorder(order, size, &prng);
-                       err = evict_something(&mm,
+                       err = evict_something(&mm, 0, U64_MAX,
                                              nodes, order, size,
                                              n, 1,
                                              mode);
@@ -1404,7 +1413,7 @@ static int igt_evict(void *ignored)
 
                for (n = 1; n < size; n <<= 1) {
                        drm_random_reorder(order, size, &prng);
-                       err = evict_something(&mm,
+                       err = evict_something(&mm, 0, U64_MAX,
                                              nodes, order, size,
                                              size/2, n,
                                              mode);
@@ -1422,7 +1431,7 @@ static int igt_evict(void *ignored)
                        DRM_MM_BUG_ON(!nsize);
 
                        drm_random_reorder(order, size, &prng);
-                       err = evict_something(&mm,
+                       err = evict_something(&mm, 0, U64_MAX,
                                              nodes, order, size,
                                              nsize, n,
                                              mode);
@@ -1447,6 +1456,102 @@ err:
        return ret;
 }
 
+static int igt_evict_range(void *ignored)
+{
+       DRM_RND_STATE(prng, random_seed);
+       const unsigned int size = 8192;
+       const unsigned int range_size = size / 2;
+       const unsigned int range_start = size / 4;
+       const unsigned int range_end = range_start + range_size;
+       const struct insert_mode *mode;
+       struct drm_mm mm;
+       struct evict_node *nodes;
+       struct drm_mm_node *node, *next;
+       unsigned int *order, n;
+       int ret, err;
+
+       /* Like igt_evict() but now we are limiting the search to a
+        * small portion of the full drm_mm.
+        */
+
+       ret = -ENOMEM;
+       nodes = vzalloc(size * sizeof(*nodes));
+       if (!nodes)
+               goto err;
+
+       order = drm_random_order(size, &prng);
+       if (!order)
+               goto err_nodes;
+
+       ret = -EINVAL;
+       drm_mm_init(&mm, 0, size);
+       for (n = 0; n < size; n++) {
+               err = drm_mm_insert_node(&mm, &nodes[n].node, 1, 0,
+                                        DRM_MM_SEARCH_DEFAULT);
+               if (err) {
+                       pr_err("insert failed, step %d\n", n);
+                       ret = err;
+                       goto out;
+               }
+       }
+
+       for (mode = evict_modes; mode->name; mode++) {
+               for (n = 1; n <= range_size; n <<= 1) {
+                       drm_random_reorder(order, size, &prng);
+                       err = evict_something(&mm, range_start, range_end,
+                                             nodes, order, size,
+                                             n, 1,
+                                             mode);
+                       if (err) {
+                               pr_err("%s evict_something(size=%u) failed with range [%u, %u]\n",
+                                      mode->name, n, range_start, range_end);
+                               goto out;
+                       }
+               }
+
+               for (n = 1; n <= range_size; n <<= 1) {
+                       drm_random_reorder(order, size, &prng);
+                       err = evict_something(&mm, range_start, range_end,
+                                             nodes, order, size,
+                                             range_size/2, n,
+                                             mode);
+                       if (err) {
+                               pr_err("%s evict_something(size=%u, alignment=%u) failed with range [%u, %u]\n",
+                                      mode->name, range_size/2, n, range_start, range_end);
+                               goto out;
+                       }
+               }
+
+               for_each_prime_number_from(n, 1, min(range_size, max_prime)) {
+                       unsigned int nsize = (range_size - n + 1) / 2;
+
+                       DRM_MM_BUG_ON(!nsize);
+
+                       drm_random_reorder(order, size, &prng);
+                       err = evict_something(&mm, range_start, range_end,
+                                             nodes, order, size,
+                                             nsize, n,
+                                             mode);
+                       if (err) {
+                               pr_err("%s evict_something(size=%u, alignment=%u) failed with range [%u, %u]\n",
+                                      mode->name, nsize, n, range_start, range_end);
+                               goto out;
+                       }
+               }
+       }
+
+       ret = 0;
+out:
+       drm_mm_for_each_node_safe(node, next, &mm)
+               drm_mm_remove_node(node);
+       drm_mm_takedown(&mm);
+       kfree(order);
+err_nodes:
+       vfree(nodes);
+err:
+       return ret;
+}
+
 #include "drm_selftest.c"
 
 static int __init test_drm_mm_init(void)