From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Exercise the new __sg_alloc_table_from_pages API (and through
it also the old sg_alloc_table_from_pages), checking that the
created table has the expected number of segments depending on
the sequence of input pages and other conditions.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
tools/testing/scatterlist/Makefile | 30 +++++++++
tools/testing/scatterlist/linux/mm.h | 125 +++++++++++++++++++++++++++++++++++
tools/testing/scatterlist/main.c | 112 +++++++++++++++++++++++++++++++
3 files changed, 267 insertions(+)
create mode 100644 tools/testing/scatterlist/Makefile
create mode 100644 tools/testing/scatterlist/linux/mm.h
create mode 100644 tools/testing/scatterlist/main.c
diff --git a/tools/testing/scatterlist/Makefile b/tools/testing/scatterlist/Makefile
new file mode 100644
index 000000000000..0867e0ef32d6
--- /dev/null
+++ b/tools/testing/scatterlist/Makefile
@@ -0,0 +1,30 @@
+CFLAGS += -I. -I../../include -g -O2 -Wall -fsanitize=address
+LDFLAGS += -fsanitize=address
+TARGETS = main
+OFILES = main.o scatterlist.o
+
+ifeq ($(BUILD), 32)
+ CFLAGS += -m32
+ LDFLAGS += -m32
+endif
+
+targets: include $(TARGETS)
+
+main: $(OFILES)
+
+clean:
+ $(RM) $(TARGETS) $(OFILES) scatterlist.c linux/scatterlist.h linux/highmem.h linux/kmemleak.h asm/io.h
+ @rmdir asm
+
+scatterlist.c: ../../../lib/scatterlist.c
+ @sed -e 's/^static //' -e 's/__always_inline //' -e 's/inline //' < $< > $@
+
+.PHONY: include
+
+include: ../../../include/linux/scatterlist.h
+ @mkdir -p linux
+ @mkdir -p asm
+ @touch asm/io.h
+ @touch linux/highmem.h
+ @touch linux/kmemleak.h
+ @cp $< linux/scatterlist.h
diff --git a/tools/testing/scatterlist/linux/mm.h b/tools/testing/scatterlist/linux/mm.h
new file mode 100644
index 000000000000..ccbb248ebdc1
--- /dev/null
+++ b/tools/testing/scatterlist/linux/mm.h
@@ -0,0 +1,125 @@
+#ifndef _LINUX_MM_H
+#define _LINUX_MM_H
+
+#include <assert.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+
+typedef unsigned long dma_addr_t;
+
+#define unlikely
+
+#define BUG_ON(x) assert(!(x))
+
+#define WARN_ON(condition) ({ \
+ int __ret_warn_on = !!(condition); \
+ unlikely(__ret_warn_on); \
+})
+
+#define WARN_ON_ONCE(condition) ({ \
+ int __ret_warn_on = !!(condition); \
+ if (unlikely(__ret_warn_on)) \
+ assert(0); \
+ unlikely(__ret_warn_on); \
+})
+
+#define PAGE_SIZE (4096)
+#define PAGE_SHIFT (12)
+#define PAGE_MASK (~(PAGE_SIZE-1))
+
+#define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1)
+#define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask))
+#define ALIGN(x, a) __ALIGN_KERNEL((x), (a))
+
+#define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
+
+#define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
+
+#define virt_to_page(x) ((void *)x)
+#define page_address(x) ((void *)x)
+
+static inline unsigned long page_to_phys(struct page *page)
+{
+ assert(0);
+
+ return 0;
+}
+
+#define page_to_pfn(page) ((unsigned long)(page) / PAGE_SIZE)
+#define pfn_to_page(pfn) (void *)((pfn) * PAGE_SIZE)
+#define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
+
+#define __min(t1, t2, min1, min2, x, y) ({ \
+ t1 min1 = (x); \
+ t2 min2 = (y); \
+ (void) (&min1 == &min2); \
+ min1 < min2 ? min1 : min2; })
+
+#define ___PASTE(a,b) a##b
+#define __PASTE(a,b) ___PASTE(a,b)
+
+#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
+
+#define min(x, y) \
+ __min(typeof(x), typeof(y), \
+ __UNIQUE_ID(min1_), __UNIQUE_ID(min2_), \
+ x, y)
+
+#define min_t(type, x, y) \
+ __min(type, type, \
+ __UNIQUE_ID(min1_), __UNIQUE_ID(min2_), \
+ x, y)
+
+#define preemptible() (1)
+
+static inline void *kmap(struct page *page)
+{
+ assert(0);
+
+ return NULL;
+}
+
+static inline void *kmap_atomic(struct page *page)
+{
+ assert(0);
+
+ return NULL;
+}
+
+static inline void kunmap(void *addr)
+{
+ assert(0);
+}
+
+static inline void kunmap_atomic(void *addr)
+{
+ assert(0);
+}
+
+static inline unsigned long __get_free_page(unsigned int flags)
+{
+ return (unsigned long)malloc(PAGE_SIZE);
+}
+
+static inline void free_page(unsigned long page)
+{
+ free((void *)page);
+}
+
+static inline void *kmalloc(unsigned int size, unsigned int flags)
+{
+ return malloc(size);
+}
+
+#define kfree(x) free(x)
+
+#define kmemleak_alloc(a, b, c, d)
+#define kmemleak_free(a)
+
+#define PageSlab(p) (0)
+#define flush_kernel_dcache_page(p)
+
+#endif
diff --git a/tools/testing/scatterlist/main.c b/tools/testing/scatterlist/main.c
new file mode 100644
index 000000000000..edf9b2960734
--- /dev/null
+++ b/tools/testing/scatterlist/main.c
@@ -0,0 +1,112 @@
+#include <stdio.h>
+#include <assert.h>
+
+#include <linux/scatterlist.h>
+
+#define MAX_PAGES (64)
+
+static unsigned
+_set_pages(struct page **pages, const unsigned *array, unsigned num)
+{
+ unsigned int i;
+
+ assert(num < MAX_PAGES);
+
+ for (i = 0; i < num; i++)
+ pages[i] = (struct page *)(unsigned long)
+ ((1 + array[i]) * PAGE_SIZE);
+
+ return num;
+}
+
+#define set_pages(p, a) _set_pages((p), (a), sizeof(a) / sizeof(a[0]))
+
+#define check_and_free(_st, _ret, _nents) \
+{ \
+ assert((_ret) == 0); \
+ assert((_st)->nents == _nents); \
+ assert((_st)->orig_nents == _nents); \
+ sg_free_table(_st); \
+}
+
+static int
+alloc_tbl(struct sg_table *st, struct page **pages, unsigned nr_pages,
+ unsigned offset, unsigned size, unsigned max)
+{
+ return __sg_alloc_table_from_pages(st, pages, nr_pages, offset, size,
+ max, GFP_KERNEL);
+}
+
+int main(void)
+{
+ const unsigned int sgmax = SCATTERLIST_MAX_SEGMENT;
+ struct page *pages[MAX_PAGES];
+ struct sg_table st;
+ int ret;
+
+ ret = set_pages(pages, ((unsigned []){ 0 }));
+ ret = alloc_tbl(&st, pages, ret, 0, ret * PAGE_SIZE, PAGE_SIZE + 1);
+ assert(ret == -EINVAL);
+
+ ret = set_pages(pages, ((unsigned []){ 0 }));
+ ret = alloc_tbl(&st, pages, ret, 0, ret * PAGE_SIZE, 0);
+ assert(ret == -EINVAL);
+
+ ret = set_pages(pages, ((unsigned []){ 0 }));
+ ret = alloc_tbl(&st, pages, ret, 0, ret * PAGE_SIZE, sgmax);
+ check_and_free(&st, ret, 1);
+
+ ret = set_pages(pages, ((unsigned []){ 0 }));
+ ret = alloc_tbl(&st, pages, ret, 0, ret, sgmax);
+ check_and_free(&st, ret, 1);
+
+ ret = set_pages(pages, ((unsigned []){ 0, 1 }));
+ ret = alloc_tbl(&st, pages, ret, 0, ret * PAGE_SIZE, sgmax);
+ check_and_free(&st, ret, 1);
+
+ ret = set_pages(pages, ((unsigned []){ 0, 2 }));
+ ret = alloc_tbl(&st, pages, ret, 0, ret * PAGE_SIZE, sgmax);
+ check_and_free(&st, ret, 2);
+
+ ret = set_pages(pages, ((unsigned []){ 0, 1, 3 }));
+ ret = alloc_tbl(&st, pages, ret, 0, ret * PAGE_SIZE, sgmax);
+ check_and_free(&st, ret, 2);
+
+ ret = set_pages(pages, ((unsigned []){ 0, 1, 3, 4 }));
+ ret = alloc_tbl(&st, pages, ret, 0, ret * PAGE_SIZE, sgmax);
+ check_and_free(&st, ret, 2);
+
+ ret = set_pages(pages, ((unsigned []){ 0, 1, 3, 4, 5 }));
+ ret = alloc_tbl(&st, pages, ret, 0, ret * PAGE_SIZE, sgmax);
+ check_and_free(&st, ret, 2);
+
+ ret = set_pages(pages, ((unsigned []){ 0, 1, 3, 4, 6 }));
+ ret = alloc_tbl(&st, pages, ret, 0, ret * PAGE_SIZE, sgmax);
+ check_and_free(&st, ret, 3);
+
+ ret = set_pages(pages, ((unsigned []){ 0, 2, 4, 6, 8 }));
+ ret = alloc_tbl(&st, pages, ret, 0, ret * PAGE_SIZE, sgmax);
+ check_and_free(&st, ret, 5);
+
+ ret = set_pages(pages, ((unsigned []){ 0, 1, 2, 3, 4 }));
+ ret = alloc_tbl(&st, pages, ret, 0, ret * PAGE_SIZE, sgmax);
+ check_and_free(&st, ret, 1);
+
+ ret = set_pages(pages, ((unsigned []){ 0, 1, 2, 3, 4 }));
+ ret = alloc_tbl(&st, pages, ret, 0, ret * PAGE_SIZE, 2 * PAGE_SIZE);
+ check_and_free(&st, ret, 3);
+
+ ret = set_pages(pages, ((unsigned []){ 0, 1, 2, 3, 4, 5}));
+ ret = alloc_tbl(&st, pages, ret, 0, ret * PAGE_SIZE, 2 * PAGE_SIZE);
+ check_and_free(&st, ret, 3);
+
+ ret = set_pages(pages, ((unsigned []){ 0, 2, 3, 4, 5, 6}));
+ ret = alloc_tbl(&st, pages, ret, 0, ret * PAGE_SIZE, 2 * PAGE_SIZE);
+ check_and_free(&st, ret, 4);
+
+ ret = set_pages(pages, ((unsigned []){ 0, 1, 3, 4, 5, 6}));
+ ret = alloc_tbl(&st, pages, ret, 0, ret * PAGE_SIZE, 2 * PAGE_SIZE);
+ check_and_free(&st, ret, 3);
+
+ return 0;
+}
--
2.9.4
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