Measure the memcpy bw between our CPU accessible regions, trying all
supported mapping combinations(WC, WB) across various sizes.
v2:
use smaller sizes
throw in memcpy32/memcpy64/memcpy_from_wc
Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
.../drm/i915/selftests/i915_perf_selftests.h | 1 +
.../drm/i915/selftests/intel_memory_region.c | 203 ++++++++++++++++++
2 files changed, 204 insertions(+)
diff --git a/drivers/gpu/drm/i915/selftests/i915_perf_selftests.h b/drivers/gpu/drm/i915/selftests/i915_perf_selftests.h
index 5a577a1332f5..3bf7f53e9924 100644
--- a/drivers/gpu/drm/i915/selftests/i915_perf_selftests.h
+++ b/drivers/gpu/drm/i915/selftests/i915_perf_selftests.h
@@ -17,3 +17,4 @@
*/
selftest(engine_cs, intel_engine_cs_perf_selftests)
selftest(blt, i915_gem_object_blt_perf_selftests)
+selftest(region, intel_memory_region_perf_selftests)
diff --git a/drivers/gpu/drm/i915/selftests/intel_memory_region.c b/drivers/gpu/drm/i915/selftests/intel_memory_region.c
index 3ef3620e0da5..2a1d4ba1f9f3 100644
--- a/drivers/gpu/drm/i915/selftests/intel_memory_region.c
+++ b/drivers/gpu/drm/i915/selftests/intel_memory_region.c
@@ -4,6 +4,7 @@
*/
#include <linux/prime_numbers.h>
+#include <linux/sort.h>
#include "../i915_selftest.h"
@@ -19,6 +20,7 @@
#include "gem/selftests/mock_context.h"
#include "gt/intel_engine_user.h"
#include "gt/intel_gt.h"
+#include "i915_memcpy.h"
#include "selftests/igt_flush_test.h"
#include "selftests/i915_random.h"
@@ -572,6 +574,195 @@ static int igt_lmem_write_cpu(void *arg)
return err;
}
+static const char *repr_type(u32 type)
+{
+ switch (type) {
+ case I915_MAP_WB:
+ return "WB";
+ case I915_MAP_WC:
+ return "WC";
+ }
+
+ return "";
+}
+
+static struct drm_i915_gem_object *
+create_region_for_mapping(struct intel_memory_region *mr, u64 size, u32 type,
+ void **out_addr)
+{
+ struct drm_i915_gem_object *obj;
+ void *addr;
+
+ obj = i915_gem_object_create_region(mr, size, 0);
+ if (IS_ERR(obj))
+ return obj;
+
+ addr = i915_gem_object_pin_map(obj, type);
+ if (IS_ERR(addr)) {
+ i915_gem_object_put(obj);
+ if (PTR_ERR(addr) == -ENXIO)
+ return ERR_PTR(-ENODEV);
+ return addr;
+ }
+
+ *out_addr = addr;
+ return obj;
+}
+
+static int wrap_ktime_compare(const void *A, const void *B)
+{
+ const ktime_t *a = A, *b = B;
+
+ return ktime_compare(*a, *b);
+}
+
+static void igt_memcpy_long(void *dst, const void *src, size_t size)
+{
+ unsigned long *tmp = dst;
+ const unsigned long *s = src;
+
+ size = size / sizeof(unsigned long);
+ while (size--)
+ *tmp++ = *s++;
+}
+
+static inline void igt_memcpy(void *dst, const void *src, size_t size)
+{
+ memcpy(dst, src, size);
+}
+
+static inline void igt_memcpy_from_wc(void *dst, const void *src, size_t size)
+{
+ i915_memcpy_from_wc(dst, src, size);
+}
+
+static int _perf_memcpy(struct intel_memory_region *src_mr,
+ struct intel_memory_region *dst_mr,
+ u64 size, u32 src_type, u32 dst_type)
+{
+ struct drm_i915_private *i915 = src_mr->i915;
+ const struct {
+ const char *name;
+ void (*copy)(void *dst, const void *src, size_t size);
+ bool skip;
+ } tests[] = {
+ {
+ "memcpy",
+ igt_memcpy,
+ },
+ {
+ "memcpy_long",
+ igt_memcpy_long,
+ },
+ {
+ "memcpy_from_wc",
+ igt_memcpy_from_wc,
+ !i915_has_memcpy_from_wc(),
+ },
+ };
+ struct drm_i915_gem_object *src, *dst;
+ void *src_addr, *dst_addr;
+ int ret = 0;
+ int i;
+
+ src = create_region_for_mapping(src_mr, size, src_type, &src_addr);
+ if (IS_ERR(src)) {
+ ret = PTR_ERR(src);
+ goto out;
+ }
+
+ dst = create_region_for_mapping(dst_mr, size, dst_type, &dst_addr);
+ if (IS_ERR(dst)) {
+ ret = PTR_ERR(dst);
+ goto out_unpin_src;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(tests); ++i) {
+ ktime_t t[5];
+ int pass;
+
+ if (tests[i].skip)
+ continue;
+
+ for (pass = 0; pass < ARRAY_SIZE(t); pass++) {
+ ktime_t t0, t1;
+
+ t0 = ktime_get();
+
+ tests[i].copy(dst_addr, src_addr, size);
+
+ t1 = ktime_get();
+ t[pass] = ktime_sub(t1, t0);
+ }
+
+ sort(t, ARRAY_SIZE(t), sizeof(*t), wrap_ktime_compare, NULL);
+ pr_info("%s src(%s, %s) -> dst(%s, %s) %14s %4llu KiB copy: %5lld MiB/s\n",
+ __func__,
+ src_mr->name,
+ repr_type(src_type),
+ dst_mr->name,
+ repr_type(dst_type),
+ tests[i].name,
+ size >> 10,
+ div64_u64(mul_u32_u32(4 * size,
+ 1000 * 1000 * 1000),
+ t[1] + 2 * t[2] + t[3]) >> 20);
+
+ cond_resched();
+ }
+
+ i915_gem_object_unpin_map(dst);
+ i915_gem_object_put(dst);
+out_unpin_src:
+ i915_gem_object_unpin_map(src);
+ i915_gem_object_put(src);
+
+ i915_gem_drain_freed_objects(i915);
+out:
+ if (ret == -ENODEV)
+ ret = 0;
+
+ return ret;
+}
+
+static int perf_memcpy(void *arg)
+{
+ struct drm_i915_private *i915 = arg;
+ static const u32 types[] = {
+ I915_MAP_WB,
+ I915_MAP_WC,
+ };
+ static const u32 sizes[] = {
+ SZ_4K,
+ SZ_64K,
+ SZ_4M,
+ };
+ struct intel_memory_region *src_mr, *dst_mr;
+ int src_id, dst_id;
+ int i, j, k;
+ int ret;
+
+ for_each_memory_region(src_mr, i915, src_id) {
+ for_each_memory_region(dst_mr, i915, dst_id) {
+ for (i = 0; i < ARRAY_SIZE(sizes); ++i) {
+ for (j = 0; j < ARRAY_SIZE(types); ++j) {
+ for (k = 0; k < ARRAY_SIZE(types); ++k) {
+ ret = _perf_memcpy(src_mr,
+ dst_mr,
+ sizes[i],
+ types[j],
+ types[k]);
+ if (ret)
+ return ret;
+ }
+ }
+ }
+ }
+ }
+
+ return 0;
+}
+
int intel_memory_region_mock_selftests(void)
{
static const struct i915_subtest tests[] = {
@@ -619,3 +810,15 @@ int intel_memory_region_live_selftests(struct drm_i915_private *i915)
return i915_live_subtests(tests, i915);
}
+
+int intel_memory_region_perf_selftests(struct drm_i915_private *i915)
+{
+ static const struct i915_subtest tests[] = {
+ SUBTEST(perf_memcpy),
+ };
+
+ if (intel_gt_is_wedged(&i915->gt))
+ return 0;
+
+ return i915_live_subtests(tests, i915);
+}
--
2.20.1
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