tools/testing/scatterlist: Test new __sg_alloc_table_from_pages

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.

v2: Move to data driven for readability.
v3: Add some more testcases and -fsanitize=undefined. (Chris Wilson)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20170906145506.14952-1-tvrtko.ursulin@linux.intel.com
[tursulin: whitespace fixup]

diff --git a/tools/testing/scatterlist/Makefile b/tools/testing/scatterlist/Makefile
new file mode 100644 (file)
index 0000000..933c3a6
--- /dev/null
+++ b/tools/testing/scatterlist/Makefile
@@ -0,0 +1,30 @@
+CFLAGS += -I. -I../../include -g -O2 -Wall -fsanitize=address
+LDFLAGS += -fsanitize=address -fsanitize=undefined
+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 (file)
index 0000000..6f9ac14
--- /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 (file)
index 0000000..0a14641
--- /dev/null
+++ b/tools/testing/scatterlist/main.c
@@ -0,0 +1,79 @@
+#include <stdio.h>
+#include <assert.h>
+
+#include <linux/scatterlist.h>
+
+#define MAX_PAGES (64)
+
+static void 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);
+}
+
+#define pfn(...) (unsigned []){ __VA_ARGS__ }
+
+int main(void)
+{
+       const unsigned int sgmax = SCATTERLIST_MAX_SEGMENT;
+       struct test {
+               int alloc_ret;
+               unsigned num_pages;
+               unsigned *pfn;
+               unsigned size;
+               unsigned int max_seg;
+               unsigned int expected_segments;
+       } *test, tests[] = {
+               { -EINVAL, 1, pfn(0), PAGE_SIZE, PAGE_SIZE + 1, 1 },
+               { -EINVAL, 1, pfn(0), PAGE_SIZE, 0, 1 },
+               { -EINVAL, 1, pfn(0), PAGE_SIZE, sgmax + 1, 1 },
+               { 0, 1, pfn(0), PAGE_SIZE, sgmax, 1 },
+               { 0, 1, pfn(0), 1, sgmax, 1 },
+               { 0, 2, pfn(0, 1), 2 * PAGE_SIZE, sgmax, 1 },
+               { 0, 2, pfn(1, 0), 2 * PAGE_SIZE, sgmax, 2 },
+               { 0, 3, pfn(0, 1, 2), 3 * PAGE_SIZE, sgmax, 1 },
+               { 0, 3, pfn(0, 2, 1), 3 * PAGE_SIZE, sgmax, 3 },
+               { 0, 3, pfn(0, 1, 3), 3 * PAGE_SIZE, sgmax, 2 },
+               { 0, 3, pfn(1, 2, 4), 3 * PAGE_SIZE, sgmax, 2 },
+               { 0, 3, pfn(1, 3, 4), 3 * PAGE_SIZE, sgmax, 2 },
+               { 0, 4, pfn(0, 1, 3, 4), 4 * PAGE_SIZE, sgmax, 2 },
+               { 0, 5, pfn(0, 1, 3, 4, 5), 5 * PAGE_SIZE, sgmax, 2 },
+               { 0, 5, pfn(0, 1, 3, 4, 6), 5 * PAGE_SIZE, sgmax, 3 },
+               { 0, 5, pfn(0, 1, 2, 3, 4), 5 * PAGE_SIZE, sgmax, 1 },
+               { 0, 5, pfn(0, 1, 2, 3, 4), 5 * PAGE_SIZE, 2 * PAGE_SIZE, 3 },
+               { 0, 6, pfn(0, 1, 2, 3, 4, 5), 6 * PAGE_SIZE, 2 * PAGE_SIZE, 3 },
+               { 0, 6, pfn(0, 2, 3, 4, 5, 6), 6 * PAGE_SIZE, 2 * PAGE_SIZE, 4 },
+               { 0, 6, pfn(0, 1, 3, 4, 5, 6), 6 * PAGE_SIZE, 2 * PAGE_SIZE, 3 },
+               { 0, 0, NULL, 0, 0, 0 },
+       };
+       unsigned int i;
+
+       for (i = 0, test = tests; test->expected_segments; test++, i++) {
+               struct page *pages[MAX_PAGES];
+               struct sg_table st;
+               int ret;
+
+               set_pages(pages, test->pfn, test->num_pages);
+
+               ret = __sg_alloc_table_from_pages(&st, pages, test->num_pages,
+                                                 0, test->size, test->max_seg,
+                                                 GFP_KERNEL);
+               assert(ret == test->alloc_ret);
+
+               if (test->alloc_ret)
+                       continue;
+
+               assert(st.nents == test->expected_segments);
+               assert(st.orig_nents == test->expected_segments);
+
+               sg_free_table(&st);
+       }
+
+       assert(i == (sizeof(tests) / sizeof(tests[0])) - 1);
+
+       return 0;
+}