Re: [PATCH v10] drm/i915: Squash repeated awaits on the same fence

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On 28/04/2017 08:41, Chris Wilson wrote:

[snip]

+static int igt_sync(void *arg)
+{
+	const struct {
+		const char *name;
+		u32 seqno;
+		bool expected;
+		bool set;
+	} pass[] = {
+		{ "unset", 0, false, false },
+		{ "new", 0, false, true },
+		{ "0a", 0, true, true },
+		{ "1a", 1, false, true },
+		{ "1b", 1, true, true },
+		{ "0b", 0, true, false },
+		{ "2a", 2, false, true },
+		{ "4", 4, false, true },
+		{ "INT_MAX", INT_MAX, false, true },
+		{ "INT_MAX-1", INT_MAX-1, true, false },
+		{ "INT_MAX+1", (u32)INT_MAX+1, false, true },
+		{ "INT_MAX", INT_MAX, true, false },
+		{ "UINT_MAX", UINT_MAX, false, true },
+		{ "wrap", 0, false, true },
+		{ "unwrap", UINT_MAX, true, false },
+		{},
+	}, *p;
+	struct intel_timeline *tl;
+	int order, offset;
+	int ret;
+
+	tl = mock_timeline(0);
+	if (!tl)
+		return -ENOMEM;
+
+	for (p = pass; p->name; p++) {
+		for (order = 1; order < 64; order++) {
+			for (offset = -1; offset <= (order > 1); offset++) {
+				u64 ctx = BIT_ULL(order) + offset;
+
+				if (__intel_timeline_sync_is_later
+				    (tl, ctx, p->seqno) != p->expected) {
+					pr_err("1: %s(ctx=%llu, seqno=%u) expected passed %s but failed\n",
+					       p->name, ctx, p->seqno, yesno(p->expected));
+					ret = -EINVAL;
+					goto out;
+				}
+
+				if (p->set) {
+					ret = __intel_timeline_sync_set(tl, ctx, p->seqno);
+					if (ret)
+						goto out;
+				}
+			}
+		}
+	}

I think verification that the tree height matches the expectation, and also total number of nodes, is required.

If too complicated in the current structure you could add a simpler iteration over another table of steps, which would include the ctx id and seqno in it, and expected height/total nodes after each step.

Regards,

Tvrtko

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