On Thu, Feb 25, 2016 at 10:32:11AM +0000, daniele.ceraolospu...@intel.com wrote:
> +/* This test covers the case where we end up in an uninitialised area of the
> + * ppgtt at an offset greater than the one where the last buffer is mapped.
> This
> + * is particularly relevant if 48b ppgtt is enabled because the ppgtt is
> + * massively bigger compared to the 32b case and it takes a lot more time to
> + * wrap, so the acthd can potentially keep increasing for a long time
> + */
> +#define NSEC_PER_SEC 1000000000L
> +static void ppgtt_walking(void)
> +{
> + int fd;
> + int64_t timeout_ns = 100 * NSEC_PER_SEC; /* 100 seconds */
This needs a note that this has to be greater than ~5*hangcheck.
> + struct drm_i915_gem_execbuffer2 execbuf;
> + struct drm_i915_gem_exec_object2 gem_exec;
> + uint32_t handle;
> + uint32_t batch[4];
> +
> + fd = drm_open_driver(DRIVER_INTEL);
> + igt_require(gem_gtt_type(fd) > 2);
Nope, just full-ppgtt is required (and provides a sensible hangcheck
test if !48bit as well).
Note this does require that the hangcheck is enabled, so igt_require().
> +
> + /* the batch will be mapped to an offset < 4GB because the flag to allow
> + * 48b offsets is not specified, so jump to address 0x00000001 00000000
> + */
> + batch[0] = MI_BATCH_BUFFER_START | 1;
> + batch[1] = 0;
> + batch[2] = 1;
> + batch[3] = MI_BATCH_BUFFER_END;
The vm is entirely empty. Just submit an unterminated (empty) batch, and
it will walk from 0 to 1<<48bit and around and around and around and
around...
> +
> + handle = gem_create(fd, 4096);
> + gem_write(fd, handle, 0, batch, sizeof(batch));
> +
> + memset(&gem_exec, 0, sizeof(gem_exec));
> + gem_exec.handle = handle;
> +
> + memset(&execbuf, 0, sizeof(execbuf));
> + execbuf.buffers_ptr = (uintptr_t)&gem_exec;
> + execbuf.buffer_count = 1;
> + execbuf.batch_len = 16;
> +
> + gem_execbuf(fd, &execbuf);
> +
> + igt_assert(gem_wait(fd, handle, &timeout_ns) == 0);
igt_assert_eq(gem_wait(), 0); so you get the information about the
failure.
> + igt_assert(timeout_ns > 0);
Redundant. gem_wait() returns ETIME if we wait for timeout_ns without
completion.
> +
> + gem_close(fd, handle);
Irrelevant, it will be closed with close(fd).
> + close(fd);
> +}
> +
> igt_main
> {
> const struct intel_execution_engine *e;
> @@ -314,4 +361,7 @@ igt_main
> test_error_state_capture(e->exec_id | e->flags,
> e->full_name);
> }
> +
> + igt_subtest("ppgtt-walking")
> + ppgtt_walking();
This is a hangcheck test, "hangcheck-unterminated"
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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