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]
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Tvrtko Ursulin
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3 changed files with 234 additions and 0 deletions
30
tools/testing/scatterlist/Makefile
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30
tools/testing/scatterlist/Makefile
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CFLAGS += -I. -I../../include -g -O2 -Wall -fsanitize=address
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LDFLAGS += -fsanitize=address -fsanitize=undefined
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TARGETS = main
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OFILES = main.o scatterlist.o
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ifeq ($(BUILD), 32)
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CFLAGS += -m32
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LDFLAGS += -m32
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endif
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targets: include $(TARGETS)
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main: $(OFILES)
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clean:
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$(RM) $(TARGETS) $(OFILES) scatterlist.c linux/scatterlist.h linux/highmem.h linux/kmemleak.h asm/io.h
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@rmdir asm
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scatterlist.c: ../../../lib/scatterlist.c
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@sed -e 's/^static //' -e 's/__always_inline //' -e 's/inline //' < $< > $@
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.PHONY: include
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include: ../../../include/linux/scatterlist.h
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@mkdir -p linux
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@mkdir -p asm
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@touch asm/io.h
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@touch linux/highmem.h
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@touch linux/kmemleak.h
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@cp $< linux/scatterlist.h
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125
tools/testing/scatterlist/linux/mm.h
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125
tools/testing/scatterlist/linux/mm.h
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#ifndef _LINUX_MM_H
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#define _LINUX_MM_H
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#include <assert.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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typedef unsigned long dma_addr_t;
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#define unlikely
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#define BUG_ON(x) assert(!(x))
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#define WARN_ON(condition) ({ \
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int __ret_warn_on = !!(condition); \
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unlikely(__ret_warn_on); \
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})
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#define WARN_ON_ONCE(condition) ({ \
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int __ret_warn_on = !!(condition); \
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if (unlikely(__ret_warn_on)) \
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assert(0); \
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unlikely(__ret_warn_on); \
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})
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#define PAGE_SIZE (4096)
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#define PAGE_SHIFT (12)
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#define PAGE_MASK (~(PAGE_SIZE-1))
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#define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1)
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#define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask))
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#define ALIGN(x, a) __ALIGN_KERNEL((x), (a))
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#define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
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#define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
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#define virt_to_page(x) ((void *)x)
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#define page_address(x) ((void *)x)
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static inline unsigned long page_to_phys(struct page *page)
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{
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assert(0);
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return 0;
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}
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#define page_to_pfn(page) ((unsigned long)(page) / PAGE_SIZE)
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#define pfn_to_page(pfn) (void *)((pfn) * PAGE_SIZE)
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#define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
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#define __min(t1, t2, min1, min2, x, y) ({ \
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t1 min1 = (x); \
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t2 min2 = (y); \
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(void) (&min1 == &min2); \
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min1 < min2 ? min1 : min2; })
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#define ___PASTE(a,b) a##b
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#define __PASTE(a,b) ___PASTE(a,b)
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#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
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#define min(x, y) \
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__min(typeof(x), typeof(y), \
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__UNIQUE_ID(min1_), __UNIQUE_ID(min2_), \
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x, y)
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#define min_t(type, x, y) \
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__min(type, type, \
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__UNIQUE_ID(min1_), __UNIQUE_ID(min2_), \
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x, y)
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#define preemptible() (1)
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static inline void *kmap(struct page *page)
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{
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assert(0);
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return NULL;
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}
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static inline void *kmap_atomic(struct page *page)
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{
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assert(0);
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return NULL;
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}
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static inline void kunmap(void *addr)
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{
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assert(0);
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}
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static inline void kunmap_atomic(void *addr)
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{
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assert(0);
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}
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static inline unsigned long __get_free_page(unsigned int flags)
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{
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return (unsigned long)malloc(PAGE_SIZE);
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}
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static inline void free_page(unsigned long page)
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{
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free((void *)page);
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}
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static inline void *kmalloc(unsigned int size, unsigned int flags)
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{
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return malloc(size);
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}
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#define kfree(x) free(x)
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#define kmemleak_alloc(a, b, c, d)
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#define kmemleak_free(a)
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#define PageSlab(p) (0)
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#define flush_kernel_dcache_page(p)
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#endif
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79
tools/testing/scatterlist/main.c
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79
tools/testing/scatterlist/main.c
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#include <stdio.h>
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#include <assert.h>
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#include <linux/scatterlist.h>
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#define MAX_PAGES (64)
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static void set_pages(struct page **pages, const unsigned *array, unsigned num)
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{
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unsigned int i;
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assert(num < MAX_PAGES);
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for (i = 0; i < num; i++)
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pages[i] = (struct page *)(unsigned long)
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((1 + array[i]) * PAGE_SIZE);
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}
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#define pfn(...) (unsigned []){ __VA_ARGS__ }
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int main(void)
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{
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const unsigned int sgmax = SCATTERLIST_MAX_SEGMENT;
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struct test {
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int alloc_ret;
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unsigned num_pages;
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unsigned *pfn;
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unsigned size;
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unsigned int max_seg;
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unsigned int expected_segments;
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} *test, tests[] = {
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{ -EINVAL, 1, pfn(0), PAGE_SIZE, PAGE_SIZE + 1, 1 },
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{ -EINVAL, 1, pfn(0), PAGE_SIZE, 0, 1 },
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{ -EINVAL, 1, pfn(0), PAGE_SIZE, sgmax + 1, 1 },
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{ 0, 1, pfn(0), PAGE_SIZE, sgmax, 1 },
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{ 0, 1, pfn(0), 1, sgmax, 1 },
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{ 0, 2, pfn(0, 1), 2 * PAGE_SIZE, sgmax, 1 },
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{ 0, 2, pfn(1, 0), 2 * PAGE_SIZE, sgmax, 2 },
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{ 0, 3, pfn(0, 1, 2), 3 * PAGE_SIZE, sgmax, 1 },
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{ 0, 3, pfn(0, 2, 1), 3 * PAGE_SIZE, sgmax, 3 },
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{ 0, 3, pfn(0, 1, 3), 3 * PAGE_SIZE, sgmax, 2 },
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{ 0, 3, pfn(1, 2, 4), 3 * PAGE_SIZE, sgmax, 2 },
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{ 0, 3, pfn(1, 3, 4), 3 * PAGE_SIZE, sgmax, 2 },
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{ 0, 4, pfn(0, 1, 3, 4), 4 * PAGE_SIZE, sgmax, 2 },
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{ 0, 5, pfn(0, 1, 3, 4, 5), 5 * PAGE_SIZE, sgmax, 2 },
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{ 0, 5, pfn(0, 1, 3, 4, 6), 5 * PAGE_SIZE, sgmax, 3 },
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{ 0, 5, pfn(0, 1, 2, 3, 4), 5 * PAGE_SIZE, sgmax, 1 },
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{ 0, 5, pfn(0, 1, 2, 3, 4), 5 * PAGE_SIZE, 2 * PAGE_SIZE, 3 },
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{ 0, 6, pfn(0, 1, 2, 3, 4, 5), 6 * PAGE_SIZE, 2 * PAGE_SIZE, 3 },
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{ 0, 6, pfn(0, 2, 3, 4, 5, 6), 6 * PAGE_SIZE, 2 * PAGE_SIZE, 4 },
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{ 0, 6, pfn(0, 1, 3, 4, 5, 6), 6 * PAGE_SIZE, 2 * PAGE_SIZE, 3 },
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{ 0, 0, NULL, 0, 0, 0 },
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};
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unsigned int i;
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for (i = 0, test = tests; test->expected_segments; test++, i++) {
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struct page *pages[MAX_PAGES];
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struct sg_table st;
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int ret;
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set_pages(pages, test->pfn, test->num_pages);
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ret = __sg_alloc_table_from_pages(&st, pages, test->num_pages,
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0, test->size, test->max_seg,
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GFP_KERNEL);
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assert(ret == test->alloc_ret);
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if (test->alloc_ret)
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continue;
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assert(st.nents == test->expected_segments);
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assert(st.orig_nents == test->expected_segments);
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sg_free_table(&st);
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}
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assert(i == (sizeof(tests) / sizeof(tests[0])) - 1);
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return 0;
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}
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