[igt-dev] [PATCH i-g-t v5 2/4] tests/gem_exec_reloc: Don't filter out invalid addresses

[Janusz Krzysztofik]

Commit a355b2d6eb42 ("igt/gem_exec_reloc: Filter out unavailable
addresses for !ppgtt") introduced filtering of addresses possibly
occupied by other users of shared GTT.  Unfortunately, that filtering
doesn't distinguish between actually occupied addresses and otherwise
invalid softpin offsets.  If incorrect GTT alignment will be assumed
when running on future backends with possibly larger minimum page
sizes, a half of calculated offsets to be tested will be incorrectly
detected as occupied by other users and silently skipped instead of
reported as a problem.  That will significantly distort the intended
test pattern.

Filter out failing addresses only if reported as occupied.

v2: Skip unavailable addresses only when not running on full PPGTT.
v3: Replace the not on full PPGTT requirement for skipping with error
    code checking.
v4: Silently skip only those offsets which have been explicitly
    reported as overlapping with shared GTT reserved space, not simply
    all which raise failures other than -EINVAL (Chris),
  - as an implementation of moving the probe out of line so it's not
    easily confused with the central point of the test (Chris), use
    object validation library helper just introduced.

Signed-off-by: Janusz Krzysztofik <janusz.krzysztofik at linux.intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
---
 tests/i915/gem_exec_reloc.c | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/tests/i915/gem_exec_reloc.c b/tests/i915/gem_exec_reloc.c
index fdd9661d..e46a4df7 100644
--- a/tests/i915/gem_exec_reloc.c
+++ b/tests/i915/gem_exec_reloc.c
@@ -23,6 +23,7 @@
 
 #include "igt.h"
 #include "igt_dummyload.h"
+#include "i915/gem_gtt_topology.c"
 
 IGT_TEST_DESCRIPTION("Basic sanity check of execbuf-ioctl relocations.");
 
@@ -520,7 +521,7 @@ static void basic_range(int fd, unsigned flags)
 	uint64_t gtt_size = gem_aperture_size(fd);
 	const uint32_t bbe = MI_BATCH_BUFFER_END;
 	igt_spin_t *spin = NULL;
-	int count, n;
+	int count, n, err;
 
 	igt_require(gem_has_softpin(fd));
 
@@ -539,11 +540,12 @@ static void basic_range(int fd, unsigned flags)
 		obj[n].offset = (1ull << (i + 12)) - 4096;
 		obj[n].offset = gen8_canonical_address(obj[n].offset);
 		obj[n].flags = EXEC_OBJECT_PINNED | EXEC_OBJECT_SUPPORTS_48B_ADDRESS;
-		gem_write(fd, obj[n].handle, 0, &bbe, sizeof(bbe));
-		execbuf.buffers_ptr = to_user_pointer(&obj[n]);
-		execbuf.buffer_count = 1;
-		if (__gem_execbuf(fd, &execbuf))
+		err = gem_gtt_validate_object(fd, &obj[n]);
+		if (err) {
+			/* Iff using a shared GTT, some of it may be reserved */
+			igt_assert_eq(err, -ENOSPC);
 			continue;
+		}
 
 		igt_debug("obj[%d] handle=%d, address=%llx\n",
 			  n, obj[n].handle, (long long)obj[n].offset);
@@ -559,11 +561,12 @@ static void basic_range(int fd, unsigned flags)
 		obj[n].offset = 1ull << (i + 12);
 		obj[n].offset = gen8_canonical_address(obj[n].offset);
 		obj[n].flags = EXEC_OBJECT_PINNED | EXEC_OBJECT_SUPPORTS_48B_ADDRESS;
-		gem_write(fd, obj[n].handle, 0, &bbe, sizeof(bbe));
-		execbuf.buffers_ptr = to_user_pointer(&obj[n]);
-		execbuf.buffer_count = 1;
-		if (__gem_execbuf(fd, &execbuf))
+		err = gem_gtt_validate_object(fd, &obj[n]);
+		if (err) {
+			/* Iff using a shared GTT, some of it may be reserved */
+			igt_assert_eq(err, -ENOSPC);
 			continue;
+		}
 
 		igt_debug("obj[%d] handle=%d, address=%llx\n",
 			  n, obj[n].handle, (long long)obj[n].offset);
-- 
2.21.0