memblock tests: Add skeleton of the memblock simulator

Add basic project files, together with local stubs of required headers.
Update tools/include/slab.h to include definitions used by memblock.

Signed-off-by: Karolina Drobnik <[email protected]>
Signed-off-by: Mike Rapoport <[email protected]>
Link: https://lore.kernel.org/r/d296fceb023a04b316a31fbff9acf1e76ac684e4.1643796665.git.karolinadrobnik@gmail.com

Author: drobnik

MAINTAINERS

@@ -12423,6 +12423,7 @@ S:	Maintained
 F:	Documentation/core-api/boot-time-mm.rst
 F:	include/linux/memblock.h
 F:	mm/memblock.c
+F:	tools/testing/memblock/
 
 MEMORY CONTROLLER DRIVERS
 M:	Krzysztof Kozlowski <[email protected]>

tools/include/linux/slab.h

@@ -13,6 +13,16 @@
 void *kmalloc(size_t size, gfp_t gfp);
 void kfree(void *p);
 
+bool slab_is_available(void);
+
+enum slab_state {
+	DOWN,
+	PARTIAL,
+	PARTIAL_NODE,
+	UP,
+	FULL
+};
+
 static inline void *kzalloc(size_t size, gfp_t gfp)
 {
 	return kmalloc(size, gfp | __GFP_ZERO);

tools/testing/memblock/.gitignore

@@ -0,0 +1,4 @@
+main
+memblock.c
+linux/memblock.h
+asm/cmpxchg.h

tools/testing/memblock/Makefile

@@ -0,0 +1,52 @@
+# SPDX-License-Identifier: GPL-2.0
+
+# Memblock simulator requires AddressSanitizer (libasan) and liburcu development
+# packages installed
+CFLAGS += -I. -I../../include -Wall -O2 -fsanitize=address \
+	  -fsanitize=undefined -D CONFIG_PHYS_ADDR_T_64BIT
+LDFLAGS += -fsanitize=address -fsanitize=undefined
+TARGETS = main
+OFILES = main.o memblock.o lib/slab.o mmzone.o slab.o
+EXTR_SRC = ../../../mm/memblock.c
+
+ifeq ($(BUILD), 32)
+	CFLAGS += -m32
+	LDFLAGS += -m32
+endif
+
+# Process user parameters
+include scripts/Makefile.include
+
+main: $(OFILES)
+
+$(OFILES): include
+
+include: ../../../include/linux/memblock.h ../../include/linux/*.h \
+	../../include/asm/*.h
+
+	@mkdir -p linux
+	test -L linux/memblock.h || ln -s ../../../../include/linux/memblock.h linux/memblock.h
+	test -L asm/cmpxchg.h || ln -s ../../../arch/x86/include/asm/cmpxchg.h asm/cmpxchg.h
+
+memblock.c: $(EXTR_SRC)
+	test -L memblock.c || ln -s $(EXTR_SRC) memblock.c
+
+clean:
+	$(RM) $(TARGETS) $(OFILES) linux/memblock.h memblock.c asm/cmpxchg.h
+
+help:
+	@echo  'Memblock simulator'
+	@echo  ''
+	@echo  'Available targets:'
+	@echo  '  main		  - Build the memblock simulator'
+	@echo  '  clean		  - Remove generated files and symlinks in the directory'
+	@echo  ''
+	@echo  'Configuration:'
+	@echo  '  make NUMA=1               - simulate enabled NUMA'
+	@echo  '  make MOVABLE_NODE=1       - override `movable_node_is_enabled`'
+	@echo  '                              definition to simulate movable NUMA nodes'
+	@echo  '  make 32BIT_PHYS_ADDR_T=1  - Use 32 bit physical addresses'
+
+vpath %.c ../../lib
+
+.PHONY: clean include help

tools/testing/memblock/asm/dma.h

@@ -0,0 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _TOOLS_DMA_H
+#define _TOOLS_DMA_H
+
+#endif

tools/testing/memblock/internal.h

@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef _MM_INTERNAL_H
+#define _MM_INTERNAL_H
+
+struct page {};
+
+void memblock_free_pages(struct page *page, unsigned long pfn,
+			 unsigned int order)
+{
+}
+
+#endif

tools/testing/memblock/lib/slab.c

@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/slab.h>
+
+enum slab_state slab_state;
+
+bool slab_is_available(void)
+{
+	return slab_state >= UP;
+}

tools/testing/memblock/linux/init.h

@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_INIT_H
+#define _LINUX_INIT_H
+
+#include <linux/compiler.h>
+#include <asm/export.h>
+#include <linux/memory_hotplug.h>
+
+#define __section(section)              __attribute__((__section__(section)))
+
+#define __initconst
+#define __meminit
+#define __meminitdata
+#define __refdata
+#define __initdata
+
+struct obs_kernel_param {
+	const char *str;
+	int (*setup_func)(char *st);
+	int early;
+};
+
+#define __setup_param(str, unique_id, fn, early)			\
+	static const char __setup_str_##unique_id[] __initconst		\
+		__aligned(1) = str;					\
+	static struct obs_kernel_param __setup_##unique_id		\
+		__used __section(".init.setup")				\
+		__aligned(__alignof__(struct obs_kernel_param)) =	\
+		{ __setup_str_##unique_id, fn, early }
+
+#define early_param(str, fn)						\
+	__setup_param(str, fn, fn, 1)
+
+#endif

tools/testing/memblock/linux/kernel.h

@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef _MEMBLOCK_LINUX_KERNEL_H
+#define _MEMBLOCK_LINUX_KERNEL_H
+
+#include <../../include/linux/kernel.h>
+#include <linux/errno.h>
+#include <string.h>
+#include <linux/printk.h>
+#include <linux/linkage.h>
+#include <linux/kconfig.h>
+
+#endif

tools/testing/memblock/linux/kmemleak.h

@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef _KMEMLEAK_H
+#define _KMEMLEAK_H
+
+static inline void kmemleak_free_part_phys(phys_addr_t phys, size_t size)
+{
+}
+
+static inline void kmemleak_alloc_phys(phys_addr_t phys, size_t size,
+				       int min_count, gfp_t gfp)
+{
+}
+
+static inline void dump_stack(void)
+{
+}
+
+#endif