[PATCH 33/66] drm/i915: Add some selftests for sg_table manipulation
Chris Wilson
chris at chris-wilson.co.uk
Sun Jan 1 16:18:15 UTC 2017
Start exercising the scattergather lists, especially looking at
iteration after coalescing.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
drivers/gpu/drm/i915/i915_gem.c | 11 +-
.../gpu/drm/i915/selftests/i915_mock_selftests.h | 1 +
drivers/gpu/drm/i915/selftests/scatterlist.c | 255 +++++++++++++++++++++
3 files changed, 264 insertions(+), 3 deletions(-)
create mode 100644 drivers/gpu/drm/i915/selftests/scatterlist.c
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index cf826b001563..f094914c6642 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2303,17 +2303,17 @@ static unsigned int swiotlb_max_size(void)
#endif
}
-static void i915_sg_trim(struct sg_table *orig_st)
+static bool i915_sg_trim(struct sg_table *orig_st)
{
struct sg_table new_st;
struct scatterlist *sg, *new_sg;
unsigned int i;
if (orig_st->nents == orig_st->orig_nents)
- return;
+ return false;
if (sg_alloc_table(&new_st, orig_st->nents, GFP_KERNEL | __GFP_NOWARN))
- return;
+ return false;
new_sg = new_st.sgl;
for_each_sg(orig_st->sgl, sg, orig_st->nents, i) {
@@ -2326,6 +2326,7 @@ static void i915_sg_trim(struct sg_table *orig_st)
sg_free_table(orig_st);
*orig_st = new_st;
+ return true;
}
static struct sg_table *
@@ -4953,3 +4954,7 @@ i915_gem_object_get_dma_address(struct drm_i915_gem_object *obj,
sg = i915_gem_object_get_sg(obj, n, &offset);
return sg_dma_address(sg) + (offset << PAGE_SHIFT);
}
+
+#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
+#include "selftests/scatterlist.c"
+#endif
diff --git a/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h b/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h
index 69e97a2ba4a6..5f0bdda42ed8 100644
--- a/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h
+++ b/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h
@@ -9,3 +9,4 @@
* Tests are executed in order by igt/drv_selftest
*/
selftest(sanitycheck, i915_mock_sanitycheck) /* keep first (igt selfcheck) */
+selftest(scatterlist, scatterlist_mock_selftests)
diff --git a/drivers/gpu/drm/i915/selftests/scatterlist.c b/drivers/gpu/drm/i915/selftests/scatterlist.c
new file mode 100644
index 000000000000..1573be8961bf
--- /dev/null
+++ b/drivers/gpu/drm/i915/selftests/scatterlist.c
@@ -0,0 +1,255 @@
+/*
+ * Copyright © 2016 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <linux/prime_numbers.h>
+
+#include "i915_selftest.h"
+
+#define PFN_BIAS (1 << 10)
+
+struct pfn_table {
+ struct sg_table st;
+ unsigned long start, end;
+};
+
+static noinline int expect_pfn_sg(struct pfn_table *pt, const char *who)
+{
+ struct scatterlist *sg;
+ unsigned long pfn, n;
+
+ pfn = pt->start;
+ for_each_sg(pt->st.sgl, sg, pt->st.nents, n) {
+ struct page *page = sg_page(sg);
+
+ if (page_to_pfn(page) != pfn) {
+ pr_err("%s left pages out of order, expected pfn %lu, found pfn %lu (using for_each_sg)\n",
+ who, pfn, page_to_pfn(page));
+ return -EINVAL;
+ }
+
+ if (sg->length != (n + 1) * PAGE_SIZE) {
+ pr_err("%s: %s copied wrong sg length, expected size %lu, found %u (using for_each_sg)\n",
+ __func__, who, (n + 1) * PAGE_SIZE, sg->length);
+ return -EINVAL;
+ }
+
+ cond_resched();
+ if (signal_pending(current))
+ return -EINTR;
+
+ pfn += n + 1;
+ }
+ if (pfn != pt->end) {
+ pr_err("%s: %s finished on wrong pfn, expected %lu, found %lu\n",
+ __func__, who, pt->end, pfn);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static noinline int expect_pfn_sg_page_iter(struct pfn_table *pt, const char *who)
+{
+ struct sg_page_iter sgiter;
+ unsigned long pfn;
+
+ pfn = pt->start;
+ for_each_sg_page(pt->st.sgl, &sgiter, pt->st.nents, 0) {
+ struct page *page = sg_page_iter_page(&sgiter);
+
+ if (page != pfn_to_page(pfn)) {
+ pr_err("%s: %s left pages out of order, expected pfn %lu, found pfn %lu (using for_each_sg_page)\n",
+ __func__, who, pfn, page_to_pfn(page));
+ return -EINVAL;
+ }
+
+ cond_resched();
+ if (signal_pending(current))
+ return -EINTR;
+
+ pfn++;
+ }
+ if (pfn != pt->end) {
+ pr_err("%s: %s finished on wrong pfn, expected %lu, found %lu\n",
+ __func__, who, pt->end, pfn);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static noinline int expect_pfn_sgtiter(struct pfn_table *pt, const char *who)
+{
+ struct sgt_iter sgt;
+ struct page *page;
+ unsigned long pfn;
+
+ pfn = pt->start;
+ for_each_sgt_page(page, sgt, &pt->st) {
+ if (page != pfn_to_page(pfn)) {
+ pr_err("%s: %s left pages out of order, expected pfn %lu, found pfn %lu (using for_each_sgt_page)\n",
+ __func__, who, pfn, page_to_pfn(page));
+ return -EINVAL;
+ }
+
+ cond_resched();
+ if (signal_pending(current))
+ return -EINTR;
+
+ pfn++;
+ }
+ if (pfn != pt->end) {
+ pr_err("%s: %s finished on wrong pfn, expected %lu, found %lu\n",
+ __func__, who, pt->end, pfn);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int expect_pfn_sgtable(struct pfn_table *pt, const char *who)
+{
+ int err;
+
+ err = expect_pfn_sg(pt, who);
+ if (err)
+ return err;
+
+ err = expect_pfn_sg_page_iter(pt, who);
+ if (err)
+ return err;
+
+ err = expect_pfn_sgtiter(pt, who);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+static bool alloc_table(struct pfn_table *pt,
+ unsigned long count,
+ unsigned long max)
+{
+ struct scatterlist *sg;
+ unsigned long n, pfn;
+
+ if (sg_alloc_table(&pt->st, max,
+ GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN))
+ return false;
+
+ pt->start = PFN_BIAS;
+ pfn = pt->start;
+ sg = pt->st.sgl;
+ for (n = 0; n < count; n++) {
+ if (n)
+ sg = sg_next(sg);
+ sg_set_page(sg, pfn_to_page(pfn), (n + 1)*PAGE_SIZE, 0);
+ pfn += n + 1;
+ }
+ sg_mark_end(sg);
+ pt->st.nents = n;
+ pt->end = pfn;
+
+ return true;
+}
+
+static int igt_sg_alloc(void *ignored)
+{
+ I915_SELFTEST_TIMEOUT(end_time);
+ const unsigned long max_order = 20; /* approximating a 4GiB object */
+ unsigned long prime;
+
+ for_each_prime_number(prime, max_order) {
+ unsigned long size = BIT(prime);
+ int offset;
+
+ for (offset = -1; offset <= 1; offset++) {
+ struct pfn_table pt;
+ int err;
+
+ if (!alloc_table(&pt, size + offset, size + offset))
+ return 0; /* out of memory, give up */
+
+ err = expect_pfn_sgtable(&pt, "sg_alloc_table");
+ sg_free_table(&pt.st);
+ if (err)
+ return err;
+
+ if (time_after(jiffies, end_time)) {
+ pr_warn("%s timed out: last table size %lu\n",
+ __func__, size + offset);
+ return 0;
+ }
+ }
+ }
+
+ return 0;
+}
+
+static int igt_sg_trim(void *ignored)
+{
+ I915_SELFTEST_TIMEOUT(end_time);
+ const unsigned long max = PAGE_SIZE; /* not prime! */
+ struct pfn_table pt;
+ unsigned long prime;
+
+ for_each_prime_number(prime, max) {
+ int err;
+
+ if (!alloc_table(&pt, prime, max))
+ return 0; /* out of memory, give up */
+
+ err = 0;
+ if (i915_sg_trim(&pt.st)) {
+ if (pt.st.orig_nents != prime ||
+ pt.st.nents != prime) {
+ pr_err("i915_sg_trim failed (nents %u, orig_nents %u), expected %lu\n",
+ pt.st.nents, pt.st.orig_nents, prime);
+ err = -EINVAL;
+ } else {
+ err = expect_pfn_sgtable(&pt, "i915_sg_trim");
+ }
+ }
+ sg_free_table(&pt.st);
+ if (err)
+ return err;
+
+ if (time_after(jiffies, end_time)) {
+ pr_warn("%s timed out: last trim size %lu/%lu\n",
+ __func__, prime, max);
+ return 0;
+ }
+ }
+
+ return 0;
+}
+
+int scatterlist_mock_selftests(void)
+{
+ static const struct i915_subtest tests[] = {
+ SUBTEST(igt_sg_alloc),
+ SUBTEST(igt_sg_trim),
+ };
+
+ return i915_subtests(tests, NULL);
+}
--
2.11.0
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