[igt-dev] [PATCH i-g-t v9 11/16] Verify execbuf fails with stale PXP buffer after teardown

[Rodrigo Vivi]

On Thu, Sep 02, 2021 at 10:30:38AM -0700, Alan Previn wrote:
> Add a check to verify that reusing a stale protected buffer
> in a gem_execbuff (with a protected context) after a teardown
> event fails with -ENOEXEC error. Trigger the teardown via the
> pxp invalidation debugfs that simulates a HW teardown IRQ.
> 
> NOTE: The end-to-end architecture requirement includes that
> any break in the links of the PXP sessions needs to trigger a
> full teardown and the application needs to be made aware of that
> allowing it to re-establish the end-to-end pipeline of buffers,
> contexts and renders again if it chooses to. This stricter
> behavior targets only contexts created with PXP enabled.
> 
> Signed-off-by: Alan Previn <alan.previn.teres.alexis at intel.com>
> ---
>  tests/i915/gem_pxp.c | 35 +++++++++++++++++++++++++++++++++++
>  1 file changed, 35 insertions(+)
> 
> diff --git a/tests/i915/gem_pxp.c b/tests/i915/gem_pxp.c
> index 6884e0d7..fab8e28d 100644
> --- a/tests/i915/gem_pxp.c
> +++ b/tests/i915/gem_pxp.c
> @@ -794,6 +794,39 @@ static void test_pxp_stale_ctx_execution(int i915)
>  	free_exec_assets(i915, &data);
>  }
>  
> +static void test_pxp_stale_buf_execution(int i915)
> +{
> +	int ret;
> +	struct simple_exec_assets data = {0};
> +	uint32_t ctx2;
> +	struct intel_bb *ibb2;
> +
> +	/* Use pxp buffers with pxp context for testing for invalidation of protected buffers. */
> +	prepare_exec_assets(i915, &data, true, true);
> +	ret = gem_execbuf_flush_store_dw(i915, data.ibb, data.ctx, data.fencebuf);
> +	igt_assert(ret == 0);
> +
> +	trigger_pxp_debugfs_forced_teardown(i915);
> +
> +	/*
> +	 * After teardown, use a new pxp context but reuse the stale bo to ensure
> +	 * the kernel is catching the invalidated bo (not context)
> +	 */
> +	ret = create_ctx_with_params(i915, true, true, true, false, &ctx2);
> +	igt_assert_eq(ret, 0);
> +	igt_assert_eq(get_ctx_protected_param(i915, ctx2), 1);
> +	ibb2 = intel_bb_create_with_context(i915, ctx2, 4096);
> +	igt_assert(ibb2);
> +	intel_bb_remove_intel_buf(data.ibb, data.fencebuf);
> +	intel_bb_add_intel_buf(ibb2, data.fencebuf, true);
> +	ret = gem_execbuf_flush_store_dw(i915, ibb2, ctx2, data.fencebuf);
> +	igt_assert_f((ret == -ENOEXEC), "Executing stale pxp buffer didn't fail with -ENOEXEC\n");

I believe this is opposite as well...
Or I am getting confused...

other than this, everything looks good

> +
> +	intel_bb_destroy(ibb2);
> +	gem_context_destroy(i915, ctx2);
> +	free_exec_assets(i915, &data);
> +}
> +
>  igt_main
>  {
>  	int i915 = -1;
> @@ -885,6 +918,8 @@ igt_main
>  			test_pxp_pwrcycle_teardown_keychange(i915, &pm);
>  		igt_subtest("verify-pxp-stale-ctx-execution")
>  			test_pxp_stale_ctx_execution(i915);
> +		igt_subtest("verify-pxp-stale-buf-execution")
> +			test_pxp_stale_buf_execution(i915);
>  	}
>  
>  	igt_fixture {
> -- 
> 2.25.1
>