[igt-dev] [PATCH i-g-t v9 09/16] Verify PXP teardown occurred through suspend-resume

[Teres Alexis, Alan Previn]

On Fri, 2021-09-03 at 12:47 -0400, Rodrigo Vivi wrote:
> On Thu, Sep 02, 2021 at 10:30:36AM -0700, Alan Previn wrote:
> > During a suspend-resume cycle, the driver shall ensure the
> > PXP session and keys are torn down and re-established.
> > Verify that key change did occur by repeating the 3d
> > rendercopy operation before and after the suspend-resume
> > cycle and ensuring the encrypted output is different.
> 
> Is this aligned with the latest series from Daniele?
> In the latest version we are blocking the runtime_pm if
> there's active protected context. So we might do only
> system-suspend tests?
> 
> Anyway, I have a feeling that those changes might impact this case.

when you say "might impact this case", do u mean this specific subtest - i.e. teardown-check-after-
suspend-resume? if so, I dont beleive its impacted because this subtest does pxp rendering operation
before the explicit system level suspend-resume cycle and then does a second rendering operation after
resuming, thus it should observe the encrypted content changed. Danielle and I tested on a couple of hw
with pxp support.

> 
> > Signed-off-by: Alan Previn <alan.previn.teres.alexis at intel.com>
> > Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
> > ---
> >  tests/i915/gem_pxp.c | 66 +++++++++++++++++++++++++++++++++++++++++++-
> >  1 file changed, 65 insertions(+), 1 deletion(-)
> > 
> > diff --git a/tests/i915/gem_pxp.c b/tests/i915/gem_pxp.c
> > index af40e893..b997b058 100644
> > --- a/tests/i915/gem_pxp.c
> > +++ b/tests/i915/gem_pxp.c
> > @@ -9,6 +9,12 @@
> >  IGT_TEST_DESCRIPTION("Test PXP that manages protected content through arbitrated HW-PXP-session");
> >  /* Note: PXP = "Protected Xe Path" */
> >  
> > +/* Struct and definitions for power management. */
> > +struct powermgt_data {
> > +	int debugfsdir;
> > +	bool has_runtime_pm;
> > +};
> > +
> >  static int create_bo_ext(int i915, uint32_t size, bool protected_is_true, uint32_t *bo_out)
> >  {
> >  	int ret;
> > @@ -465,7 +471,7 @@ static void test_render_baseline(int i915)
> >  	buf_ops_destroy(bops);
> >  }
> >  
> > -static void test_render_pxp_src_to_protdest(int i915)
> > +static void __test_render_pxp_src_to_protdest(int i915, uint32_t *outpixels, int outsize)
> >  {
> >  	uint32_t ctx, srcbo, dstbo;
> >  	struct intel_buf *srcbuf, *dstbuf;
> > @@ -507,6 +513,10 @@ static void test_render_pxp_src_to_protdest(int i915)
> >  	assert_bo_content_check(i915, dstbo, COMPARE_COLOR_UNREADIBLE,
> >  				TSTSURF_SIZE, TSTSURF_FILLCOLOR2, NULL, 0);
> >  
> > +	if (outpixels)
> > +		assert_bo_content_check(i915, dstbo, COPY_BUFFER,
> > +					TSTSURF_SIZE, 0, outpixels, outsize);
> > +
> >  	intel_bb_destroy(ibb);
> >  	intel_buf_destroy(srcbuf);
> >  	gem_close(i915, srcbo);
> > @@ -516,6 +526,11 @@ static void test_render_pxp_src_to_protdest(int i915)
> >  	buf_ops_destroy(bops);
> >  }
> >  
> > +static void test_render_pxp_src_to_protdest(int i915)
> > +{
> > +	__test_render_pxp_src_to_protdest(i915, NULL, 0);
> > +}
> > +
> >  static void test_render_pxp_protsrc_to_protdest(int i915)
> >  {
> >  	uint32_t ctx, srcbo, dstbo, dstbo2;
> > @@ -595,10 +610,46 @@ static void test_render_pxp_protsrc_to_protdest(int i915)
> >  	buf_ops_destroy(bops);
> >  }
> >  
> > +static void init_powermgt_resources(int i915, struct powermgt_data *pm)
> > +{
> > +	pm->debugfsdir = igt_debugfs_dir(i915);
> > +	igt_require(pm->debugfsdir != -1);
> > +	pm->has_runtime_pm = igt_setup_runtime_pm(i915);
> > +	igt_require(pm->has_runtime_pm);
> > +}
> > +
> > +static void trigger_powermgt_suspend_cycle(int i915,
> > +	struct powermgt_data *pm)
> > +{
> > +	igt_pm_enable_sata_link_power_management();
> > +	igt_system_suspend_autoresume(SUSPEND_STATE_MEM, SUSPEND_TEST_DEVICES);
> > +}
> > +
> > +static void test_pxp_pwrcycle_teardown_keychange(int i915, struct powermgt_data *pm)
> > +{
> > +	uint32_t encrypted_pixels_b4[TSTSURF_SIZE/TSTSURF_BYTESPP];
> > +	uint32_t encrypted_pixels_aft[TSTSURF_SIZE/TSTSURF_BYTESPP];
> > +	int matched_after_keychange = 0, loop = 0;
> > +
> > +	__test_render_pxp_src_to_protdest(i915, encrypted_pixels_b4, TSTSURF_SIZE);
> > +
> > +	trigger_powermgt_suspend_cycle(i915, pm);
> > +
> > +	__test_render_pxp_src_to_protdest(i915, encrypted_pixels_aft, TSTSURF_SIZE);
> > +
> > +	while (loop < (TSTSURF_SIZE/TSTSURF_BYTESPP)) {
> > +		if (encrypted_pixels_b4[loop] == encrypted_pixels_aft[loop])
> > +			++matched_after_keychange;
> > +		++loop;
> > +	}
> > +	igt_assert_eq(matched_after_keychange, 0);
> > +}
> > +
> >  igt_main
> >  {
> >  	int i915 = -1;
> >  	bool pxp_supported = false;
> > +	struct powermgt_data pm = {0};
> >  	igt_render_copyfunc_t rendercopy = NULL;
> >  	uint32_t devid = 0;
> >  
> > @@ -671,6 +722,19 @@ igt_main
> >  		igt_subtest("protected-encrypted-src-copy-not-readible")
> >  			test_render_pxp_protsrc_to_protdest(i915);
> >  	}
> > +	igt_subtest_group {
> > +		igt_fixture {
> > +			igt_require(pxp_supported);
> > +			devid = intel_get_drm_devid(i915);
> > +			igt_assert(devid);
> > +			rendercopy = igt_get_render_copyfunc(devid);
> > +			igt_require(rendercopy);
> > +			init_powermgt_resources(i915, &pm);
> > +		}
> > +		igt_describe("Verify suspend-resume teardown management:");
> > +		igt_subtest("verify-pxp-key-change-after-suspend-resume")
> > +			test_pxp_pwrcycle_teardown_keychange(i915, &pm);
> > +	}
> >  
> >  	igt_fixture {
> >  		close(i915);
> > -- 
> > 2.25.1
> >