[igt-dev] [PATCH i-g-t] benchmarks/gem_wsim: introduce bb_size field

[Marcin Bernatowicz]

In certain scenarios (ATS-M when using LMEM), PAGE_SIZE=4096
is insufficient for Xe, necessitating alignment considerations.
This change ensures that 'bb_size' aligns properly,
preventing VM BIND failures in cases where the size is not aligned
to the minimum page size of the region.

Additionally, 'alloc_bo' for i915 has been updated to
accommodate page-aligned allocated size.

v2: Reverted to intel_allocator_alloc_with_strategy as not related
    to the change and for clarity due to its origin in a library
    rather than local definition. (Tvrtko)

Signed-off-by: Marcin Bernatowicz <marcin.bernatowicz at intel.com>
---
 benchmarks/gem_wsim.c | 39 +++++++++++++++++++++++++--------------
 1 file changed, 25 insertions(+), 14 deletions(-)

diff --git a/benchmarks/gem_wsim.c b/benchmarks/gem_wsim.c
index 28b809520..58e0ff6e8 100644
--- a/benchmarks/gem_wsim.c
+++ b/benchmarks/gem_wsim.c
@@ -201,6 +201,7 @@ struct w_step {
 			struct drm_xe_sync *syncs;
 		} xe;
 	};
+	unsigned long bb_size;
 	uint32_t bb_handle;
 };
 
@@ -1503,7 +1504,7 @@ static unsigned int create_bb(struct w_step *w, int self)
 	gem_set_domain(fd, w->bb_handle,
 		       I915_GEM_DOMAIN_WC, I915_GEM_DOMAIN_WC);
 
-	cs = ptr = gem_mmap__wc(fd, w->bb_handle, 0, 4096, PROT_WRITE);
+	cs = ptr = gem_mmap__wc(fd, w->bb_handle, 0, w->bb_size, PROT_WRITE);
 
 	/* Store initial 64b timestamp: start */
 	*cs++ = MI_LOAD_REGISTER_IMM(1) | MI_CS_MMIO_DST;
@@ -1653,9 +1654,16 @@ xe_get_vm(struct workload *wrk, const struct w_step *w)
 	return wrk->xe.vm_list;
 }
 
-static uint32_t alloc_bo(int i915, unsigned long size)
+static uint32_t alloc_bo(int i915, unsigned long *size)
 {
-	return gem_create(i915, size);
+	uint32_t handle;
+	uint64_t sz = *size;
+
+	igt_assert_eq(__gem_create(i915, &sz, &handle), 0);
+	igt_assert(sz <= ULONG_MAX);
+	*size = sz;
+
+	return handle;
 }
 
 static void
@@ -1669,7 +1677,8 @@ alloc_step_batch(struct workload *wrk, struct w_step *w)
 	w->i915.obj = calloc(nr_obj, sizeof(*w->i915.obj));
 	igt_assert(w->i915.obj);
 
-	w->i915.obj[j].handle = alloc_bo(fd, 4096);
+	w->bb_size = PAGE_SIZE;
+	w->i915.obj[j].handle = alloc_bo(fd, &w->bb_size);
 	w->i915.obj[j].flags = EXEC_OBJECT_WRITE;
 	j++;
 	igt_assert(j < nr_obj);
@@ -1706,7 +1715,7 @@ alloc_step_batch(struct workload *wrk, struct w_step *w)
 		igt_assert(j < nr_obj);
 	}
 
-	w->bb_handle = w->i915.obj[j].handle = gem_create(fd, 4096);
+	w->bb_handle = w->i915.obj[j].handle = alloc_bo(fd, &w->bb_size);
 	w->i915.obj[j].relocation_count = create_bb(w, j);
 	igt_assert(w->i915.obj[j].relocation_count <= ARRAY_SIZE(w->i915.reloc));
 	w->i915.obj[j].relocs_ptr = to_user_pointer(&w->i915.reloc);
@@ -1734,13 +1743,15 @@ xe_alloc_step_batch(struct workload *wrk, struct w_step *w)
 	struct dep_entry *dep;
 	int i;
 
-	w->bb_handle = xe_bo_create_flags(fd, vm->id, PAGE_SIZE,
+	w->bb_size = ALIGN(PAGE_SIZE + xe_cs_prefetch_size(fd),
+			   xe_get_default_alignment(fd));
+	w->bb_handle = xe_bo_create_flags(fd, vm->id, w->bb_size,
 				visible_vram_if_possible(fd, eq->hwe_list[0].gt_id));
-	w->xe.data = xe_bo_map(fd, w->bb_handle, PAGE_SIZE);
+	w->xe.data = xe_bo_map(fd, w->bb_handle, w->bb_size);
 	w->xe.exec.address =
-		intel_allocator_alloc_with_strategy(vm->ahnd, w->bb_handle, PAGE_SIZE,
+		intel_allocator_alloc_with_strategy(vm->ahnd, w->bb_handle, w->bb_size,
 						    0, ALLOC_STRATEGY_LOW_TO_HIGH);
-	xe_vm_bind_sync(fd, vm->id, w->bb_handle, 0, w->xe.exec.address, PAGE_SIZE);
+	xe_vm_bind_sync(fd, vm->id, w->bb_handle, 0, w->xe.exec.address, w->bb_size);
 	xe_spin_init_opts(&w->xe.data->spin, .addr = w->xe.exec.address,
 				   .preempt = (w->preempt_us > 0),
 				   .ctx_ticks = duration_to_ctx_ticks(fd, eq->hwe_list[0].gt_id,
@@ -1936,7 +1947,7 @@ allocate_working_set(struct workload *wrk, struct working_set *set)
 
 	for (i = 0; i < set->nr; i++) {
 		set->sizes[i].size = get_buffer_size(wrk, &set->sizes[i]);
-		set->handles[i] = alloc_bo(fd, set->sizes[i].size);
+		set->handles[i] = alloc_bo(fd, &set->sizes[i].size);
 		total += set->sizes[i].size;
 	}
 
@@ -1971,7 +1982,7 @@ static void measure_active_set(struct workload *wrk)
 		if (w->type != BATCH)
 			continue;
 
-		batch_sizes += 4096;
+		batch_sizes += w->bb_size;
 
 		if (is_xe)
 			continue;
@@ -1990,7 +2001,7 @@ static void measure_active_set(struct workload *wrk)
 
 			if (!find_dep(deps, nr, _dep)) {
 				if (dep->working_set == -1) {
-					total += 4096;
+					total += w->bb_size;
 				} else {
 					struct working_set *set;
 
@@ -2834,8 +2845,8 @@ static void *run_workload(void *data)
 				syncobj_destroy(fd, w->xe.syncs[0].handle);
 				free(w->xe.syncs);
 				xe_vm_unbind_sync(fd, xe_get_vm(wrk, w)->id, 0, w->xe.exec.address,
-						  PAGE_SIZE);
-				gem_munmap(w->xe.data, PAGE_SIZE);
+						  w->bb_size);
+				gem_munmap(w->xe.data, w->bb_size);
 				gem_close(fd, w->bb_handle);
 			} else if (w->type == SW_FENCE) {
 				syncobj_destroy(fd, w->xe.syncs[0].handle);
-- 
2.31.1