New subject: [PATCH 2/2] drm/i915: Build DRM range manager selftests for CI

27 Nov 2016

A set of test cases to capture some annoying bugs and to ensure that
correct behaviour does not regress whilst fixing those!
Signed-off-by: Chris Wilson chris@chris-wilson.co.uk
---
 drivers/gpu/drm/Kconfig               |  13 +
 drivers/gpu/drm/Makefile              |   2 +
 drivers/gpu/drm/test-drm_mm.c         | 829 ++++++++++++++++++++++++++++++++++
 tools/testing/selftests/Makefile      |   1 +
 tools/testing/selftests/drm/drm_mm.sh |  11 +
 5 files changed, 856 insertions(+)
 create mode 100644 drivers/gpu/drm/test-drm_mm.c
 create mode 100644 tools/testing/selftests/drm/drm_mm.sh

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 95fc0410e129..22b0f28c0137 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -48,6 +48,19 @@ config DRM_DEBUG_MM
If in doubt, say "N".
+config DRM_DEBUG_MM_SELFTEST
+	tristate "kselftests for DRM range manager (struct drm_mm)"
+	depends on DRM
+	depends on DEBUG_KERNEL
+	default n
+	help
+	  This option provides a kernel module that can be used to test
+	  the DRM range manager (drm_mm) and its API. This option is not
+	  useful for distributions or general kernels, but only for kernel
+	  developers working on DRM and associated drivers.
+
+	  Say N if you are unsure
+
 config DRM_KMS_HELPER
    tristate
    depends on DRM
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 883f3e75cfbc..57818abdb5b8 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -18,6 +18,8 @@ drm-y       :=	drm_auth.o drm_bufs.o drm_cache.o \
    	drm_plane.o drm_color_mgmt.o drm_print.o \
    	drm_dumb_buffers.o drm_mode_config.o
+obj-$(CONFIG_DRM_DEBUG_MM_SELFTEST) += test-drm_mm.o
+
 drm-$(CONFIG_COMPAT) += drm_ioc32.o
 drm-$(CONFIG_DRM_GEM_CMA_HELPER) += drm_gem_cma_helper.o
 drm-$(CONFIG_PCI) += ati_pcigart.o
diff --git a/drivers/gpu/drm/test-drm_mm.c b/drivers/gpu/drm/test-drm_mm.c
new file mode 100644
index 000000000000..c2ffb6a0f344
--- /dev/null
+++ b/drivers/gpu/drm/test-drm_mm.c
@@ -0,0 +1,829 @@
+/*
+ * Test cases for the drm_mm range manager
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/vmalloc.h>
+
+#include <drm/drm_mm.h>
+
+static unsigned long *primes;
+static unsigned long prime_last, prime_sz;
+
+static unsigned long slow_next_prime_number(unsigned long x)
+{
+	for (;;) {
+		unsigned long y = int_sqrt(++x) + 1;
+		while (y > 1) {
+			if ((x % y) == 0)
+				break;
+			y--;
+		}
+		if (y == 1)
+			return x;
+	}
+}
+
+static unsigned long mark_multiples(unsigned long x,
+				    unsigned long *p,
+				    unsigned long start,
+				    unsigned long end)
+{
+	unsigned long m;
+
+	m = 2*x;
+	if (m < start)
+		m = (start / x + 1) * x;
+
+	while (m < end) {
+		__clear_bit(m, p);
+		m += x;
+	}
+
+	return x;
+}
+
+static unsigned long next_prime_number(unsigned long x)
+{
+	if (x == 1)
+		return 2;
+
+	if (x >= prime_last) {
+		unsigned long sz, y;
+		unsigned long *nprimes;
+
+		sz = x*x;
+		if (sz < x)
+			return slow_next_prime_number(x);
+
+		sz = round_up(sz, BITS_PER_LONG);
+		nprimes = krealloc(primes, sz / sizeof(long), GFP_KERNEL);
+		if (!nprimes)
+			return slow_next_prime_number(x);
+
+		/* Where memory permits, track the primes using the
+		 * Sieve of Eratosthenes.
+		 */
+		memset(nprimes + prime_sz / BITS_PER_LONG,
+		       0xff, (sz - prime_sz) / sizeof(long));
+		for (y = 2UL; y < sz; y = find_next_bit(nprimes, sz, y + 1))
+			prime_last = mark_multiples(y, nprimes, prime_sz, sz);
+
+		primes = nprimes;
+		prime_sz = sz;
+	}
+
+	return find_next_bit(primes, prime_last, x + 1);
+}
+
+#define for_each_prime(prime, max) \
+	for (prime = 1;	prime < (max); prime = next_prime_number(prime))
+
+enum test {
+	SUBTEST_INIT,
+	SUBTEST_RESERVE,
+	SUBTEST_INSERT,
+	SUBTEST_ALIGN32,
+	SUBTEST_ALIGN64,
+	SUBTEST_EVICT,
+	SUBTEST_TOPDOWN,
+};
+
+static int subtest_init(void)
+{
+	struct drm_mm mm;
+	struct drm_mm_node *hole;
+	u64 start, end;
+	int ret = -EINVAL;
+
+	drm_mm_init(&mm, 0, 4096);
+	if (!drm_mm_clean(&mm)) {
+		pr_err("mm not empty on creation\n");
+		goto out;
+	}
+
+	drm_mm_for_each_hole(hole, &mm, start, end) {
+		if (start != 0 || end != 4096) {
+			pr_err("empty mm has incorrect hole, found (%llx, %llx), expect (%llx, %llx)\n",
+			       start, end,
+			       0ull, 4096ull);
+			goto out;
+		}
+	}
+
+	ret = 0;
+out:
+	if (ret)
+		drm_mm_debug_table(&mm, __func__);
+	drm_mm_takedown(&mm);
+	return ret;
+}
+
+static int *random_order(int count)
+{
+	int *order;
+	int n;
+
+	order = kmalloc_array(count, sizeof(*order), GFP_TEMPORARY);
+	if (!order)
+		return order;
+
+	for (n = 0; n < count; n++)
+		order[n] = n;
+
+	for (n = count-1; n > 1; n--) {
+		int r = get_random_int() % (n + 1);
+		if (r != n) {
+			int tmp = order[n];
+			order[n] = order[r];
+			order[r] = tmp;
+		}
+	}
+
+	return order;
+}
+
+static int __subtest_reserve(int count, u64 size)
+{
+	struct drm_mm mm;
+	struct drm_mm_node *node, *next;
+	int *order, n;
+	int ret;
+
+	/* Fill a range with lots of nodes, check it doesn't fail too early */
+
+	ret = -ENOMEM;
+	order = random_order(count);
+	if (!order)
+		goto err;
+
+	ret = -EINVAL;
+	drm_mm_init(&mm, 0, count * size);
+	if (!drm_mm_clean(&mm)) {
+		pr_err("mm not empty on creation\n");
+		goto out;
+	}
+
+	for (n = 0; n < count; n++) {
+		int err;
+
+		node = kzalloc(sizeof(*node), GFP_KERNEL);
+		if (!node) {
+			ret = -ENOMEM;
+			goto out;
+		}
+
+		node->start = order[n] * size;
+		node->size = size;
+
+		err = drm_mm_reserve_node(&mm, node);
+		if (err) {
+			pr_err("reserve failed, step %d, start %llu\n",
+			       n, node->start);
+			ret = err;
+			goto out;
+		}
+	}
+
+	/* Repeated use should then fail */
+	for (n = 0; n < count; n++) {
+		struct drm_mm_node tmp = {
+			.start = order[n] * size,
+			.size = 1
+		};
+
+		if (!drm_mm_reserve_node(&mm, &tmp)) {
+			drm_mm_remove_node(&tmp);
+			pr_err("impossible reserve succeed, step %d, start %llu\n",
+			       n, tmp.start);
+			goto out;
+		}
+	}
+
+	ret = 0;
+out:
+	list_for_each_entry_safe(node, next,
+				 &mm.head_node.node_list, node_list) {
+		drm_mm_remove_node(node);
+		kfree(node);
+	}
+	drm_mm_takedown(&mm);
+	kfree(order);
+err:
+	return ret;
+}
+
+static int subtest_reserve(void)
+{
+	int n, ret;
+
+	for (n = 1; n < 50; n++) {
+		ret = __subtest_reserve(8192, (1ull << n) - 1);
+		if (ret)
+			return ret;
+
+		ret = __subtest_reserve(8192, 1ull << n);
+		if (ret)
+			return ret;
+
+		ret = __subtest_reserve(8192, (1ull << n) + 1);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int __subtest_insert(int count, u64 size)
+{
+	struct drm_mm mm;
+	struct drm_mm_node *nodes, *node, *next;
+	int *order, n, o = 0;
+	int ret;
+
+	/* Fill a range with lots of nodes, check it doesn't fail too early */
+
+	ret = -ENOMEM;
+	nodes = vzalloc(count * sizeof(*nodes));
+	if (!nodes)
+		goto err;
+
+	order = random_order(count);
+	if (!order)
+		goto err_nodes;
+
+	ret = -EINVAL;
+	drm_mm_init(&mm, 0, count * size);
+	if (!drm_mm_clean(&mm)) {
+		pr_err("mm not empty on creation\n");
+		goto out;
+	}
+
+	for (n = 0; n < count; n++) {
+		int err;
+
+		err = drm_mm_insert_node(&mm, &nodes[n], size, 0,
+					 DRM_MM_SEARCH_DEFAULT);
+		if (err) {
+			pr_err("insert failed, step %d, start %llu\n",
+			       n, nodes[n].start);
+			ret = err;
+			goto out;
+		}
+	}
+
+	/* Repeated use should then fail */
+	if (1) {
+		struct drm_mm_node tmp;
+
+		memset(&tmp, 0, sizeof(tmp));
+		if (!drm_mm_insert_node(&mm, &tmp, size, 0,
+					DRM_MM_SEARCH_DEFAULT)) {
+			drm_mm_remove_node(&tmp);
+			pr_err("impossible insert succeed, step %d, start %llu\n",
+			       n, tmp.start);
+			goto out;
+		}
+	}
+
+	n = 0;
+	drm_mm_for_each_node(node, &mm) {
+		if (node->start != n * size) {
+			pr_err("node %d out of order, expected start %llx, found %llx\n",
+			       n, n * size, node->start);
+			goto out;
+		}
+
+		if (node->size != size) {
+			pr_err("node %d has wrong size, expected size %llx, found %llx\n",
+			       n, size, node->size);
+			goto out;
+		}
+
+		if (node->hole_follows) {
+			pr_err("node %d is followed by a hole!\n", n);
+			goto out;
+		}
+
+		n++;
+	}
+
+	for (n = 0; n < count; n++) {
+		drm_mm_for_each_node_in_range(node, &mm, n * size, (n + 1) * size) {
+			if (node->start != n * size) {
+				pr_err("lookup node %d out of order, expected start %llx, found %llx\n",
+				       n, n * size, node->start);
+				goto out;
+			}
+		}
+	}
+
+	/* Remove one and reinsert, as the only hole it should refill itself */
+	for (n = 0; n < count; n++) {
+		int err;
+
+		drm_mm_remove_node(&nodes[n]);
+		err = drm_mm_insert_node(&mm, &nodes[n], size, 0,
+					 DRM_MM_SEARCH_DEFAULT);
+		if (err) {
+			pr_err("reinsert failed, step %d\n", n);
+			ret = err;
+			goto out;
+		}
+
+		if (nodes[n].start != n * size) {
+			pr_err("reinsert node moved, step %d, expected %llx, found %llx\n",
+			       n, n * size, nodes[n].start);
+			goto out;
+		}
+	}
+
+	/* Remove several, reinsert, check full */
+	for_each_prime(n, count) {
+		int m;
+
+		for (m = 0; m < n; m++) {
+			node = &nodes[order[(o + m) % count]];
+			drm_mm_remove_node(node);
+		}
+
+		for (m = 0; m < n; m++) {
+			int err;
+
+			node = &nodes[order[(o + m) % count]];
+			err = drm_mm_insert_node(&mm, node, size, 0,
+						 DRM_MM_SEARCH_DEFAULT);
+			if (err) {
+				pr_err("insert failed, step %d, start %llu\n",
+				       n, node->start);
+				ret = err;
+				goto out;
+			}
+		}
+
+		o += n;
+
+		if (1) {
+			struct drm_mm_node tmp;
+
+			memset(&tmp, 0, sizeof(tmp));
+			if (!drm_mm_insert_node(&mm, &tmp, size, 0,
+						DRM_MM_SEARCH_DEFAULT)) {
+				drm_mm_remove_node(&tmp);
+				pr_err("impossible insert succeed, start %llu\n",
+				       tmp.start);
+				goto out;
+			}
+		}
+
+		m = 0;
+		drm_mm_for_each_node(node, &mm) {
+			if (node->start != m * size) {
+				pr_err("node %d out of order, expected start %llx, found %llx\n",
+				       m, m * size, node->start);
+				goto out;
+			}
+
+			if (node->size != size) {
+				pr_err("node %d has wrong size, expected size %llx, found %llx\n",
+				       m, size, node->size);
+				goto out;
+			}
+
+			if (node->hole_follows) {
+				pr_err("node %d is followed by a hole!\n", m);
+				goto out;
+			}
+
+			m++;
+		}
+	}
+
+	ret = 0;
+out:
+	list_for_each_entry_safe(node, next, &mm.head_node.node_list, node_list)
+		drm_mm_remove_node(node);
+	drm_mm_takedown(&mm);
+	kfree(order);
+err_nodes:
+	vfree(nodes);
+err:
+	return ret;
+}
+
+static int subtest_insert(void)
+{
+	int n, ret;
+
+	for (n = 1; n < 50; n++) {
+		ret = __subtest_insert(8192, (1ull << n) - 1);
+		if (ret)
+			return ret;
+
+		ret = __subtest_insert(8192, 1ull << n);
+		if (ret)
+			return ret;
+
+		ret = __subtest_insert(8192, (1ull << n) + 1);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int subtest_align_pot(int max)
+{
+	struct drm_mm mm;
+	struct drm_mm_node *node, *next;
+	int bit;
+	int ret = -EINVAL;
+
+	drm_mm_init(&mm, 1, -2);
+	if (!drm_mm_clean(&mm)) {
+		pr_err("mm not empty on creation\n");
+		goto out;
+	}
+
+	for (bit = max - 1; bit; bit--) {
+		int err;
+
+		node = kzalloc(sizeof(*node), GFP_KERNEL);
+		if (!node) {
+			ret = -ENOMEM;
+			goto out;
+		}
+
+		err = drm_mm_insert_node_generic(&mm, node, 1,
+						 BIT_ULL(bit), bit,
+						 DRM_MM_SEARCH_DEFAULT,
+						 DRM_MM_CREATE_DEFAULT);
+		if (err) {
+			pr_err("insert failed with alignment=%llx [%d]",
+			       BIT_ULL(bit), bit);
+			ret = err;
+			goto out;
+		}
+
+		if (node->start & (BIT_ULL(bit) - 1)) {
+			pr_err("node inserted into wrong location %llx, expected alignment to %llx [%d]\n",
+			       node->start, BIT_ULL(bit), bit);
+			goto out;
+		}
+	}
+
+	ret = 0;
+out:
+	list_for_each_entry_safe(node, next,
+				 &mm.head_node.node_list, node_list) {
+		drm_mm_remove_node(node);
+		kfree(node);
+	}
+	drm_mm_takedown(&mm);
+	return ret;
+}
+
+static int subtest_align32(void)
+{
+	return subtest_align_pot(32);
+}
+
+static int subtest_align64(void)
+{
+	return subtest_align_pot(64);
+}
+
+static int subtest_evict(void)
+{
+	const int size = 8192;
+	struct drm_mm mm;
+	struct evict_node {
+		struct drm_mm_node node;
+		struct list_head link;
+	} *nodes;
+	struct drm_mm_node *node, *next;
+	int *order, n, m;
+	int ret;
+
+	ret = -ENOMEM;
+	nodes = vzalloc(size * sizeof(*nodes));
+	if (!nodes)
+		goto err;
+
+	order = random_order(size);
+	if (!order)
+		goto err_nodes;
+
+	ret = -EINVAL;
+	drm_mm_init(&mm, 0, size);
+	for (n = 0; n < size; n++) {
+		int err;
+
+		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 (n = 1; n < size; n <<= 1) {
+		const int nsize = size / 2;
+		LIST_HEAD(evict_list);
+		struct evict_node *e, *en;
+		struct drm_mm_node tmp;
+		bool found = false;
+		int err;
+
+		drm_mm_init_scan(&mm, nsize, n, 0);
+		for (m = 0; m < size; m++) {
+			e = &nodes[order[m]];
+			list_add(&e->link, &evict_list);
+			if (drm_mm_scan_add_block(&e->node)) {
+				found = true;
+				break;
+			}
+		}
+		if (!found) {
+			pr_err("Failed to fail eviction: size=%d, align=%d\n",
+			       nsize, n);
+			goto out;
+		}
+
+		list_for_each_entry_safe(e, en, &evict_list, link) {
+			if (!drm_mm_scan_remove_block(&e->node))
+				list_del(&e->link);
+		}
+
+		list_for_each_entry(e, &evict_list, link)
+			drm_mm_remove_node(&e->node);
+
+		memset(&tmp, 0, sizeof(tmp));
+		err = drm_mm_insert_node(&mm, &tmp, nsize, n,
+					 DRM_MM_SEARCH_DEFAULT);
+		if (err) {
+			pr_err("Failed to insert into eviction hole: size=%d, alignt=%d\n",
+			       nsize, n);
+			goto out;
+		}
+
+		if (tmp.start % n || tmp.size != nsize || tmp.hole_follows) {
+			pr_err("Inserted did not align to eviction hole: size=%lld [%d], align=%d, start=%llx, hole-follows?=%d\n",
+			       tmp.size, nsize, n, tmp.start, tmp.hole_follows);
+
+			drm_mm_remove_node(&tmp);
+			goto out;
+		}
+
+		drm_mm_remove_node(&tmp);
+		list_for_each_entry(e, &evict_list, link) {
+			err = drm_mm_reserve_node(&mm, &e->node);
+			if (err) {
+				pr_err("Failed to reinsert node after eviction: start=%llx\n",
+				       e->node.start);
+				ret = err;
+				goto out;
+			}
+		}
+	}
+
+	for_each_prime(n, size) {
+		LIST_HEAD(evict_list);
+		struct evict_node *e, *en;
+		struct drm_mm_node tmp;
+		int nsize = (size - n - 1) / 2;
+		bool found = false;
+		int err;
+
+		drm_mm_init_scan(&mm, nsize, n, 0);
+		for (m = 0; m < size; m++) {
+			e = &nodes[order[m]];
+			list_add(&e->link, &evict_list);
+			if (drm_mm_scan_add_block(&e->node)) {
+				found = true;
+				break;
+			}
+		}
+		if (!found) {
+			pr_err("Failed to fail eviction: size=%d, align=%d\n",
+			       nsize, n);
+			goto out;
+		}
+
+		list_for_each_entry_safe(e, en, &evict_list, link) {
+			if (!drm_mm_scan_remove_block(&e->node))
+				list_del(&e->link);
+		}
+
+		list_for_each_entry(e, &evict_list, link)
+			drm_mm_remove_node(&e->node);
+
+		memset(&tmp, 0, sizeof(tmp));
+		err = drm_mm_insert_node(&mm, &tmp, nsize, n,
+					 DRM_MM_SEARCH_DEFAULT);
+		if (err) {
+			pr_err("Failed to insert into eviction hole: size=%d, alignt=%d\n",
+			       nsize, n);
+			goto out;
+		}
+
+		if (tmp.start % n || tmp.size != nsize || tmp.hole_follows) {
+			pr_err("Inserted did not align to eviction hole: size=%lld [%d], align=%d, start=%llx, hole-follows?=%d\n",
+			       tmp.size, nsize, n, tmp.start, tmp.hole_follows);
+
+			drm_mm_remove_node(&tmp);
+			goto out;
+		}
+
+		drm_mm_remove_node(&tmp);
+		list_for_each_entry(e, &evict_list, link) {
+			err = drm_mm_reserve_node(&mm, &e->node);
+			if (err) {
+				pr_err("Failed to reinsert node after eviction: start=%llx\n",
+				       e->node.start);
+				ret = err;
+				goto out;
+			}
+		}
+	}
+
+	ret = 0;
+out:
+	list_for_each_entry_safe(node, next, &mm.head_node.node_list, node_list)
+		drm_mm_remove_node(node);
+	drm_mm_takedown(&mm);
+	kfree(order);
+err_nodes:
+	vfree(nodes);
+err:
+	return ret;
+}
+
+static int subtest_topdown(void)
+{
+	const int size = 8192;
+	unsigned long *bitmap;
+	struct drm_mm mm;
+	struct drm_mm_node *nodes, *node, *next;
+	int *order, n, m, o = 0;
+	int ret;
+
+	ret = -ENOMEM;
+	nodes = vzalloc(size * sizeof(*nodes));
+	if (!nodes)
+		goto err;
+
+	bitmap = kzalloc(size / BITS_PER_LONG * sizeof(unsigned long),
+			 GFP_TEMPORARY);
+	if (!bitmap)
+		goto err_nodes;
+
+	order = random_order(size);
+	if (!order)
+		goto err_bitmap;
+
+	ret = -EINVAL;
+	drm_mm_init(&mm, 0, size);
+	for (n = 0; n < size; n++) {
+		int err;
+
+		err = drm_mm_insert_node_generic(&mm, &nodes[n], 1, 0, 0,
+						 DRM_MM_SEARCH_BELOW,
+						 DRM_MM_CREATE_TOP);
+		if (err) {
+			pr_err("insert failed, step %d\n", n);
+			ret = err;
+			goto out;
+		}
+
+		if (nodes[n].hole_follows) {
+			pr_err("hole after topdown insert %d, start=%llx\n",
+			       n, nodes[n].start);
+			goto out;
+		}
+	}
+
+	for_each_prime(n, size) {
+		for (m = 0; m < n; m++) {
+			node = &nodes[order[(o + m) % size]];
+			drm_mm_remove_node(node);
+			__set_bit(node->start, bitmap);
+		}
+
+		for (m = 0; m < n; m++) {
+			int err, last;
+
+			node = &nodes[order[(o + m) % size]];
+			err = drm_mm_insert_node_generic(&mm, node, 1, 0, 0,
+							 DRM_MM_SEARCH_BELOW,
+							 DRM_MM_CREATE_TOP);
+			if (err) {
+				pr_err("insert failed, step %d/%d\n", m, n);
+				ret = err;
+				goto out;
+			}
+
+			if (node->hole_follows) {
+				pr_err("hole after topdown insert %d/%d, start=%llx\n",
+				       m, n, node->start);
+				goto out;
+			}
+
+			last = find_last_bit(bitmap, size);
+			if (node->start != last) {
+				pr_err("node %d/%d not inserted into upmost hole, expected %d, found %lld\n",
+				       m, n, last, node->start);
+				goto out;
+			}
+			__clear_bit(last, bitmap);
+		}
+
+		o += n;
+	}
+
+	ret = 0;
+out:
+	list_for_each_entry_safe(node, next, &mm.head_node.node_list, node_list)
+		drm_mm_remove_node(node);
+	drm_mm_takedown(&mm);
+	kfree(order);
+err_bitmap:
+	kfree(bitmap);
+err_nodes:
+	vfree(nodes);
+err:
+	return ret;
+}
+
+struct subtest {
+	const char *name;
+	int (*func)(void);
+	bool enabled;
+} subtests[] = {
+	[SUBTEST_INIT] = { "init", subtest_init },
+	[SUBTEST_RESERVE] = { "reserve", subtest_reserve },
+	[SUBTEST_INSERT] = { "insert", subtest_insert },
+	[SUBTEST_ALIGN32] = { "align32", subtest_align32 },
+	[SUBTEST_ALIGN64] = { "align64", subtest_align64 },
+	[SUBTEST_EVICT] = { "evict", subtest_evict },
+	[SUBTEST_TOPDOWN] = { "topdown", subtest_topdown },
+};
+
+/* Tests executed in reverse order (last in list goes first) */
+module_param_named(subtest__topdown, subtests[SUBTEST_TOPDOWN].enabled, bool, 0400);
+module_param_named(subtest__evict, subtests[SUBTEST_EVICT].enabled, bool, 0400);
+module_param_named(subtest__align64, subtests[SUBTEST_ALIGN64].enabled, bool, 0400);
+module_param_named(subtest__align32, subtests[SUBTEST_ALIGN32].enabled, bool, 0400);
+module_param_named(subtest__insert, subtests[SUBTEST_INSERT].enabled, bool, 0400);
+module_param_named(subtest__reserve, subtests[SUBTEST_RESERVE].enabled, bool, 0400);
+module_param_named(subtest__init, subtests[SUBTEST_INIT].enabled, bool, 0400);
+
+static void set_default_test_all(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(subtests); i++)
+		if (subtests[i].enabled)
+			return;
+
+	for (i = 0; i < ARRAY_SIZE(subtests); i++)
+		subtests[i].enabled = true;
+}
+
+static int __init test_drm_mm_init(void)
+{
+	int i;
+
+	pr_info("Testing DRM range manger (struct drm_mm)\n");
+	set_default_test_all();
+
+	for (i = 0; i < ARRAY_SIZE(subtests); i++) {
+		int err;
+
+		if (!subtests[i].enabled)
+			continue;
+
+		pr_debug("Running %s\n", subtests[i].name);
+		err = subtests[i].func();
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+static void __exit test_drm_mm_exit(void)
+{
+	kfree(primes);
+}
+
+module_init(test_drm_mm_init);
+module_exit(test_drm_mm_exit);
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL");
diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index f770dba2a6f6..f48229197fa8 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -1,6 +1,7 @@
 TARGETS = breakpoints
 TARGETS += capabilities
 TARGETS += cpu-hotplug
+TARGETS += drm
 TARGETS += efivarfs
 TARGETS += exec
 TARGETS += firmware
diff --git a/tools/testing/selftests/drm/drm_mm.sh b/tools/testing/selftests/drm/drm_mm.sh
new file mode 100644
index 000000000000..59c20ce50b10
--- /dev/null
+++ b/tools/testing/selftests/drm/drm_mm.sh
@@ -0,0 +1,11 @@
+#!/bin/sh
+# Runs API tests for struct drm_mm (DRM range manager)
+
+if /sbin/modprobe -q test-drm_mm; then
+       /sbin/modprobe -q -r test-drm_mm
+       echo "drm/drm_mm: ok"
+else
+       echo "drm/drm_mm: [FAIL]"
+       exit 1
+fi
+
-- 
2.10.2


    

[PATCH 1/2] drm: Add some kselftests for the DRM range manager (struct drm_mm)