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24 #include <linux/prime_numbers.h>
25 #include <linux/random.h>
27 #include "../i915_selftest.h"
29 #define PFN_BIAS (1 << 10)
33 unsigned long start, end;
36 typedef unsigned int (*npages_fn_t)(unsigned long n,
38 struct rnd_state *rnd);
40 static noinline int expect_pfn_sg(struct pfn_table *pt,
41 npages_fn_t npages_fn,
42 struct rnd_state *rnd,
44 unsigned long timeout)
46 struct scatterlist *sg;
50 for_each_sg(pt->st.sgl, sg, pt->st.nents, n) {
51 struct page *page = sg_page(sg);
52 unsigned int npages = npages_fn(n, pt->st.nents, rnd);
54 if (page_to_pfn(page) != pfn) {
55 pr_err("%s: %s left pages out of order, expected pfn %lu, found pfn %lu (using for_each_sg)\n",
56 __func__, who, pfn, page_to_pfn(page));
60 if (sg->length != npages * PAGE_SIZE) {
61 pr_err("%s: %s copied wrong sg length, expected size %lu, found %u (using for_each_sg)\n",
62 __func__, who, npages * PAGE_SIZE, sg->length);
66 if (igt_timeout(timeout, "%s timed out\n", who))
72 pr_err("%s: %s finished on wrong pfn, expected %lu, found %lu\n",
73 __func__, who, pt->end, pfn);
80 static noinline int expect_pfn_sg_page_iter(struct pfn_table *pt,
82 unsigned long timeout)
84 struct sg_page_iter sgiter;
88 for_each_sg_page(pt->st.sgl, &sgiter, pt->st.nents, 0) {
89 struct page *page = sg_page_iter_page(&sgiter);
91 if (page != pfn_to_page(pfn)) {
92 pr_err("%s: %s left pages out of order, expected pfn %lu, found pfn %lu (using for_each_sg_page)\n",
93 __func__, who, pfn, page_to_pfn(page));
97 if (igt_timeout(timeout, "%s timed out\n", who))
102 if (pfn != pt->end) {
103 pr_err("%s: %s finished on wrong pfn, expected %lu, found %lu\n",
104 __func__, who, pt->end, pfn);
111 static noinline int expect_pfn_sgtiter(struct pfn_table *pt,
113 unsigned long timeout)
120 for_each_sgt_page(page, sgt, &pt->st) {
121 if (page != pfn_to_page(pfn)) {
122 pr_err("%s: %s left pages out of order, expected pfn %lu, found pfn %lu (using for_each_sgt_page)\n",
123 __func__, who, pfn, page_to_pfn(page));
127 if (igt_timeout(timeout, "%s timed out\n", who))
132 if (pfn != pt->end) {
133 pr_err("%s: %s finished on wrong pfn, expected %lu, found %lu\n",
134 __func__, who, pt->end, pfn);
141 static int expect_pfn_sgtable(struct pfn_table *pt,
142 npages_fn_t npages_fn,
143 struct rnd_state *rnd,
145 unsigned long timeout)
149 err = expect_pfn_sg(pt, npages_fn, rnd, who, timeout);
153 err = expect_pfn_sg_page_iter(pt, who, timeout);
157 err = expect_pfn_sgtiter(pt, who, timeout);
164 static unsigned int one(unsigned long n,
166 struct rnd_state *rnd)
171 static unsigned int grow(unsigned long n,
173 struct rnd_state *rnd)
178 static unsigned int shrink(unsigned long n,
180 struct rnd_state *rnd)
185 static unsigned int random(unsigned long n,
187 struct rnd_state *rnd)
189 return 1 + (prandom_u32_state(rnd) % 1024);
192 static unsigned int random_page_size_pages(unsigned long n,
194 struct rnd_state *rnd)
197 static unsigned int page_count[] = {
198 BIT(12) >> PAGE_SHIFT,
199 BIT(16) >> PAGE_SHIFT,
200 BIT(21) >> PAGE_SHIFT,
203 return page_count[(prandom_u32_state(rnd) % 3)];
206 static inline bool page_contiguous(struct page *first,
208 unsigned long npages)
210 return first + npages == last;
213 static int alloc_table(struct pfn_table *pt,
214 unsigned long count, unsigned long max,
215 npages_fn_t npages_fn,
216 struct rnd_state *rnd,
219 struct scatterlist *sg;
220 unsigned long n, pfn;
222 if (sg_alloc_table(&pt->st, max,
223 GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN))
226 /* count should be less than 20 to prevent overflowing sg->length */
227 GEM_BUG_ON(overflows_type(count * PAGE_SIZE, sg->length));
229 /* Construct a table where each scatterlist contains different number
230 * of entries. The idea is to check that we can iterate the individual
231 * pages from inside the coalesced lists.
233 pt->start = PFN_BIAS;
236 for (n = 0; n < count; n++) {
237 unsigned long npages = npages_fn(n, count, rnd);
239 /* Nobody expects the Sparse Memmap! */
240 if (!page_contiguous(pfn_to_page(pfn),
241 pfn_to_page(pfn + npages),
243 sg_free_table(&pt->st);
249 sg_set_page(sg, pfn_to_page(pfn), npages * PAGE_SIZE, 0);
251 GEM_BUG_ON(page_to_pfn(sg_page(sg)) != pfn);
252 GEM_BUG_ON(sg->length != npages * PAGE_SIZE);
253 GEM_BUG_ON(sg->offset != 0);
264 static const npages_fn_t npages_funcs[] = {
269 random_page_size_pages,
273 static int igt_sg_alloc(void *ignored)
275 IGT_TIMEOUT(end_time);
276 const unsigned long max_order = 20; /* approximating a 4GiB object */
277 struct rnd_state prng;
279 int alloc_error = -ENOMEM;
281 for_each_prime_number(prime, max_order) {
282 unsigned long size = BIT(prime);
285 for (offset = -1; offset <= 1; offset++) {
286 unsigned long sz = size + offset;
287 const npages_fn_t *npages;
291 for (npages = npages_funcs; *npages; npages++) {
292 prandom_seed_state(&prng,
293 i915_selftest.random_seed);
294 err = alloc_table(&pt, sz, sz, *npages, &prng,
301 prandom_seed_state(&prng,
302 i915_selftest.random_seed);
303 err = expect_pfn_sgtable(&pt, *npages, &prng,
306 sg_free_table(&pt.st);
312 /* Test at least one continuation before accepting oom */
313 if (size > SG_MAX_SINGLE_ALLOC)
314 alloc_error = -ENOSPC;
320 static int igt_sg_trim(void *ignored)
322 IGT_TIMEOUT(end_time);
323 const unsigned long max = PAGE_SIZE; /* not prime! */
326 int alloc_error = -ENOMEM;
328 for_each_prime_number(prime, max) {
329 const npages_fn_t *npages;
332 for (npages = npages_funcs; *npages; npages++) {
333 struct rnd_state prng;
335 prandom_seed_state(&prng, i915_selftest.random_seed);
336 err = alloc_table(&pt, prime, max, *npages, &prng,
343 if (i915_sg_trim(&pt.st)) {
344 if (pt.st.orig_nents != prime ||
345 pt.st.nents != prime) {
346 pr_err("i915_sg_trim failed (nents %u, orig_nents %u), expected %lu\n",
347 pt.st.nents, pt.st.orig_nents, prime);
350 prandom_seed_state(&prng,
351 i915_selftest.random_seed);
352 err = expect_pfn_sgtable(&pt,
358 sg_free_table(&pt.st);
363 /* Test at least one continuation before accepting oom */
364 if (prime > SG_MAX_SINGLE_ALLOC)
365 alloc_error = -ENOSPC;
371 int scatterlist_mock_selftests(void)
373 static const struct i915_subtest tests[] = {
374 SUBTEST(igt_sg_alloc),
375 SUBTEST(igt_sg_trim),
378 return i915_subtests(tests, NULL);