memblock: extend test coverage

* add tests that trigger reallocation of memblock structures from
   memblock itself via memblock_double_array()
 * add tests for memblock_alloc_exact_nid_raw() that verify that requested
   node and memory range constraints are respected.
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Merge tag 'memblock-v6.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock

Pull memblock updates from Mike Rapoport:
 "Extend test coverage:

   - add tests that trigger reallocation of memblock structures from
     memblock itself via memblock_double_array()

   - add tests for memblock_alloc_exact_nid_raw() that verify that
     requested node and memory range constraints are respected"

* tag 'memblock-v6.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock:
  memblock tests: remove completed TODO item
  memblock tests: add generic NUMA tests for memblock_alloc_exact_nid_raw
  memblock tests: add bottom-up NUMA tests for memblock_alloc_exact_nid_raw
  memblock tests: add top-down NUMA tests for memblock_alloc_exact_nid_raw
  memblock tests: introduce range tests for memblock_alloc_exact_nid_raw
  memblock test: Update TODO list
  memblock test: Add test to memblock_reserve() 129th region
  memblock test: Add test to memblock_add() 129th region

tools/testing/memblock/Makefile

@@ -7,7 +7,7 @@ CFLAGS += -I. -I../../include -Wall -O2 -fsanitize=address \
 LDFLAGS += -fsanitize=address -fsanitize=undefined
 TARGETS = main
 TEST_OFILES = tests/alloc_nid_api.o tests/alloc_helpers_api.o tests/alloc_api.o \
-		  tests/basic_api.o tests/common.o
+		  tests/basic_api.o tests/common.o tests/alloc_exact_nid_api.o
 DEP_OFILES = memblock.o lib/slab.o mmzone.o slab.o
 OFILES = main.o $(DEP_OFILES) $(TEST_OFILES)
 EXTR_SRC = ../../../mm/memblock.c

tools/testing/memblock/TODO

@@ -1,17 +1,5 @@
 TODO
 =====
 
-1. Add tests trying to memblock_add() or memblock_reserve() 129th region.
-   This will trigger memblock_double_array(), make sure it succeeds.
-   *Important:* These tests require valid memory ranges, use dummy physical
-                memory block from common.c to implement them. It is also very
-                likely that the current MEM_SIZE won't be enough for these
-                test cases. Use realloc to adjust the size accordingly.
-
-2. Add test cases using this functions (implement them for both directions):
-   + memblock_alloc_raw()
-   + memblock_alloc_exact_nid_raw()
-   + memblock_alloc_try_nid_raw()
-
-3. Add tests for memblock_alloc_node() to check if the correct NUMA node is set
+1. Add tests for memblock_alloc_node() to check if the correct NUMA node is set
    for the new region

tools/testing/memblock/main.c

@@ -3,6 +3,7 @@
 #include "tests/alloc_api.h"
 #include "tests/alloc_helpers_api.h"
 #include "tests/alloc_nid_api.h"
+#include "tests/alloc_exact_nid_api.h"
 #include "tests/common.h"
 
 int main(int argc, char **argv)
@@ -12,6 +13,7 @@ int main(int argc, char **argv)
 	memblock_alloc_checks();
 	memblock_alloc_helpers_checks();
 	memblock_alloc_nid_checks();
+	memblock_alloc_exact_nid_checks();
 
 	return 0;
 }

tools/testing/memblock/tests/alloc_exact_nid_api.h

@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef _MEMBLOCK_ALLOC_EXACT_NID_H
+#define _MEMBLOCK_ALLOC_EXACT_NID_H
+
+#include "common.h"
+
+int memblock_alloc_exact_nid_checks(void);
+int __memblock_alloc_exact_nid_numa_checks(void);
+
+#ifdef CONFIG_NUMA
+static inline int memblock_alloc_exact_nid_numa_checks(void)
+{
+	__memblock_alloc_exact_nid_numa_checks();
+	return 0;
+}
+
+#else
+static inline int memblock_alloc_exact_nid_numa_checks(void)
+{
+	return 0;
+}
+
+#endif /* CONFIG_NUMA */
+
+#endif

tools/testing/memblock/tests/alloc_nid_api.h

@@ -5,6 +5,7 @@
 #include "common.h"
 
 int memblock_alloc_nid_checks(void);
+int memblock_alloc_exact_nid_range_checks(void);
 int __memblock_alloc_nid_numa_checks(void);
 
 #ifdef CONFIG_NUMA

tools/testing/memblock/tests/basic_api.c

@@ -423,6 +423,98 @@ static int memblock_add_near_max_check(void)
 	return 0;
 }
 
+/*
+ * A test that trying to add the 129th memory block.
+ * Expect to trigger memblock_double_array() to double the
+ * memblock.memory.max, find a new valid memory as
+ * memory.regions.
+ */
+static int memblock_add_many_check(void)
+{
+	int i;
+	void *orig_region;
+	struct region r = {
+		.base = SZ_16K,
+		.size = SZ_16K,
+	};
+	phys_addr_t new_memory_regions_size;
+	phys_addr_t base, size = SZ_64;
+	phys_addr_t gap_size = SZ_64;
+
+	PREFIX_PUSH();
+
+	reset_memblock_regions();
+	memblock_allow_resize();
+
+	dummy_physical_memory_init();
+	/*
+	 * We allocated enough memory by using dummy_physical_memory_init(), and
+	 * split it into small block. First we split a large enough memory block
+	 * as the memory region which will be choosed by memblock_double_array().
+	 */
+	base = PAGE_ALIGN(dummy_physical_memory_base());
+	new_memory_regions_size = PAGE_ALIGN(INIT_MEMBLOCK_REGIONS * 2 *
+					     sizeof(struct memblock_region));
+	memblock_add(base, new_memory_regions_size);
+
+	/* This is the base of small memory block. */
+	base += new_memory_regions_size + gap_size;
+
+	orig_region = memblock.memory.regions;
+
+	for (i = 0; i < INIT_MEMBLOCK_REGIONS; i++) {
+		/*
+		 * Add these small block to fulfill the memblock. We keep a
+		 * gap between the nearby memory to avoid being merged.
+		 */
+		memblock_add(base, size);
+		base += size + gap_size;
+
+		ASSERT_EQ(memblock.memory.cnt, i + 2);
+		ASSERT_EQ(memblock.memory.total_size, new_memory_regions_size +
+						      (i + 1) * size);
+	}
+
+	/*
+	 * At there, memblock_double_array() has been succeed, check if it
+	 * update the memory.max.
+	 */
+	ASSERT_EQ(memblock.memory.max, INIT_MEMBLOCK_REGIONS * 2);
+
+	/* memblock_double_array() will reserve the memory it used. Check it. */
+	ASSERT_EQ(memblock.reserved.cnt, 1);
+	ASSERT_EQ(memblock.reserved.total_size, new_memory_regions_size);
+
+	/*
+	 * Now memblock_double_array() works fine. Let's check after the
+	 * double_array(), the memblock_add() still works as normal.
+	 */
+	memblock_add(r.base, r.size);
+	ASSERT_EQ(memblock.memory.regions[0].base, r.base);
+	ASSERT_EQ(memblock.memory.regions[0].size, r.size);
+
+	ASSERT_EQ(memblock.memory.cnt, INIT_MEMBLOCK_REGIONS + 2);
+	ASSERT_EQ(memblock.memory.total_size, INIT_MEMBLOCK_REGIONS * size +
+					      new_memory_regions_size +
+					      r.size);
+	ASSERT_EQ(memblock.memory.max, INIT_MEMBLOCK_REGIONS * 2);
+
+	dummy_physical_memory_cleanup();
+
+	/*
+	 * The current memory.regions is occupying a range of memory that
+	 * allocated from dummy_physical_memory_init(). After free the memory,
+	 * we must not use it. So restore the origin memory region to make sure
+	 * the tests can run as normal and not affected by the double array.
+	 */
+	memblock.memory.regions = orig_region;
+	memblock.memory.cnt = INIT_MEMBLOCK_REGIONS;
+
+	test_pass_pop();
+
+	return 0;
+}
+
 static int memblock_add_checks(void)
 {
 	prefix_reset();
@@ -438,6 +530,7 @@ static int memblock_add_checks(void)
 	memblock_add_twice_check();
 	memblock_add_between_check();
 	memblock_add_near_max_check();
+	memblock_add_many_check();
 
 	prefix_pop();
 
@@ -799,6 +892,96 @@ static int memblock_reserve_near_max_check(void)
 	return 0;
 }
 
+/*
+ * A test that trying to reserve the 129th memory block.
+ * Expect to trigger memblock_double_array() to double the
+ * memblock.memory.max, find a new valid memory as
+ * reserved.regions.
+ */
+static int memblock_reserve_many_check(void)
+{
+	int i;
+	void *orig_region;
+	struct region r = {
+		.base = SZ_16K,
+		.size = SZ_16K,
+	};
+	phys_addr_t memory_base = SZ_128K;
+	phys_addr_t new_reserved_regions_size;
+
+	PREFIX_PUSH();
+
+	reset_memblock_regions();
+	memblock_allow_resize();
+
+	/* Add a valid memory region used by double_array(). */
+	dummy_physical_memory_init();
+	memblock_add(dummy_physical_memory_base(), MEM_SIZE);
+
+	for (i = 0; i < INIT_MEMBLOCK_REGIONS; i++) {
+		/* Reserve some fakes memory region to fulfill the memblock. */
+		memblock_reserve(memory_base, MEM_SIZE);
+
+		ASSERT_EQ(memblock.reserved.cnt, i + 1);
+		ASSERT_EQ(memblock.reserved.total_size, (i + 1) * MEM_SIZE);
+
+		/* Keep the gap so these memory region will not be merged. */
+		memory_base += MEM_SIZE * 2;
+	}
+
+	orig_region = memblock.reserved.regions;
+
+	/* This reserve the 129 memory_region, and makes it double array. */
+	memblock_reserve(memory_base, MEM_SIZE);
+
+	/*
+	 * This is the memory region size used by the doubled reserved.regions,
+	 * and it has been reserved due to it has been used. The size is used to
+	 * calculate the total_size that the memblock.reserved have now.
+	 */
+	new_reserved_regions_size = PAGE_ALIGN((INIT_MEMBLOCK_REGIONS * 2) *
+					sizeof(struct memblock_region));
+	/*
+	 * The double_array() will find a free memory region as the new
+	 * reserved.regions, and the used memory region will be reserved, so
+	 * there will be one more region exist in the reserved memblock. And the
+	 * one more reserved region's size is new_reserved_regions_size.
+	 */
+	ASSERT_EQ(memblock.reserved.cnt, INIT_MEMBLOCK_REGIONS + 2);
+	ASSERT_EQ(memblock.reserved.total_size, (INIT_MEMBLOCK_REGIONS + 1) * MEM_SIZE +
+						new_reserved_regions_size);
+	ASSERT_EQ(memblock.reserved.max, INIT_MEMBLOCK_REGIONS * 2);
+
+	/*
+	 * Now memblock_double_array() works fine. Let's check after the
+	 * double_array(), the memblock_reserve() still works as normal.
+	 */
+	memblock_reserve(r.base, r.size);
+	ASSERT_EQ(memblock.reserved.regions[0].base, r.base);
+	ASSERT_EQ(memblock.reserved.regions[0].size, r.size);
+
+	ASSERT_EQ(memblock.reserved.cnt, INIT_MEMBLOCK_REGIONS + 3);
+	ASSERT_EQ(memblock.reserved.total_size, (INIT_MEMBLOCK_REGIONS + 1) * MEM_SIZE +
+						new_reserved_regions_size +
+						r.size);
+	ASSERT_EQ(memblock.reserved.max, INIT_MEMBLOCK_REGIONS * 2);
+
+	dummy_physical_memory_cleanup();
+
+	/*
+	 * The current reserved.regions is occupying a range of memory that
+	 * allocated from dummy_physical_memory_init(). After free the memory,
+	 * we must not use it. So restore the origin memory region to make sure
+	 * the tests can run as normal and not affected by the double array.
+	 */
+	memblock.reserved.regions = orig_region;
+	memblock.reserved.cnt = INIT_MEMBLOCK_RESERVED_REGIONS;
+
+	test_pass_pop();
+
+	return 0;
+}
+
 static int memblock_reserve_checks(void)
 {
 	prefix_reset();
@@ -813,6 +996,7 @@ static int memblock_reserve_checks(void)
 	memblock_reserve_twice_check();
 	memblock_reserve_between_check();
 	memblock_reserve_near_max_check();
+	memblock_reserve_many_check();
 
 	prefix_pop();
 

tools/testing/memblock/tests/common.c

@@ -5,8 +5,6 @@
 #include <linux/memory_hotplug.h>
 #include <linux/build_bug.h>
 
-#define INIT_MEMBLOCK_REGIONS			128
-#define INIT_MEMBLOCK_RESERVED_REGIONS		INIT_MEMBLOCK_REGIONS
 #define PREFIXES_MAX				15
 #define DELIM					": "
 #define BASIS					10000
@@ -115,6 +113,11 @@ void dummy_physical_memory_cleanup(void)
 	free(memory_block.base);
 }
 
+phys_addr_t dummy_physical_memory_base(void)
+{
+	return (phys_addr_t)memory_block.base;
+}
+
 static void usage(const char *prog)
 {
 	BUILD_BUG_ON(ARRAY_SIZE(help_opts) != ARRAY_SIZE(long_opts) - 1);

tools/testing/memblock/tests/common.h

@@ -10,14 +10,19 @@
 #include <linux/printk.h>
 #include <../selftests/kselftest.h>
 
-#define MEM_SIZE		SZ_16K
+#define MEM_SIZE		SZ_32K
 #define NUMA_NODES		8
 
+#define INIT_MEMBLOCK_REGIONS			128
+#define INIT_MEMBLOCK_RESERVED_REGIONS		INIT_MEMBLOCK_REGIONS
+
 enum test_flags {
 	/* No special request. */
 	TEST_F_NONE = 0x0,
 	/* Perform raw allocations (no zeroing of memory). */
 	TEST_F_RAW = 0x1,
+	/* Perform allocations on the exact node specified. */
+	TEST_F_EXACT = 0x2
 };
 
 /**
@@ -124,6 +129,7 @@ void setup_memblock(void);
 void setup_numa_memblock(const unsigned int node_fracs[]);
 void dummy_physical_memory_init(void);
 void dummy_physical_memory_cleanup(void);
+phys_addr_t dummy_physical_memory_base(void);
 void parse_args(int argc, char **argv);
 
 void test_fail(void);