[Intel-gfx] [RFC PATCH 1/2] tests/core_hotunplug: Add perf health check

[Janusz Krzysztofik]

Sorry for double submission, I had to resend due to a typo in igt-dev list 
address.

Janusz

On czwartek, 8 kwietnia 2021 10:30:08 CEST Janusz Krzysztofik wrote:
> Sometimes CI reports skips of perf subtests when run subsequently after
> core_hotunplug.  That may be an indication of issues with restoring
> device perf features on driver (hot)rebind.
> 
> Detect device perf support at test start and check if still available
> after driver rebind.  If that fails, a post-subtest device recovery
> step restores the device perf support so no subsequently executed tests
> are affected.
> 
> Signed-off-by: Janusz Krzysztofik <janusz.krzysztofik at linux.intel.com>
> ---
>  tests/core_hotunplug.c | 22 ++++++++++++++++++++++
>  tests/meson.build      |  8 +++++++-
>  2 files changed, 29 insertions(+), 1 deletion(-)
> 
> diff --git a/tests/core_hotunplug.c b/tests/core_hotunplug.c
> index 56a88fefd..06f15d845 100644
> --- a/tests/core_hotunplug.c
> +++ b/tests/core_hotunplug.c
> @@ -31,6 +31,7 @@
>  #include <unistd.h>
>  
>  #include "i915/gem.h"
> +#include "i915/perf.h"
>  #include "igt.h"
>  #include "igt_device_scan.h"
>  #include "igt_kmod.h"
> @@ -50,6 +51,7 @@ struct hotunplug {
>  	const char *dev_bus_addr;
>  	const char *failure;
>  	bool need_healthcheck;
> +	bool has_intel_perf;
>  };
>  
>  /* Helpers */
> @@ -319,6 +321,16 @@ static int local_i915_recover(int i915)
>  	return local_i915_healthcheck(i915, "post-");
>  }
>  
> +static bool local_i915_perf_healthcheck(int i915)
> +{
> +	struct intel_perf *intel_perf;
> +
> +	intel_perf = intel_perf_for_fd(i915);
> +	if (intel_perf)
> +		intel_perf_free(intel_perf);
> +	return intel_perf;
> +}
> +
>  #define FLAG_RENDER	(1 << 0)
>  #define FLAG_RECOVER	(1 << 1)
>  static void node_healthcheck(struct hotunplug *priv, unsigned flags)
> @@ -360,6 +372,13 @@ static void node_healthcheck(struct hotunplug *priv, unsigned flags)
>  		}
>  	}
>  
> +	if (!priv->failure && priv->has_intel_perf) {
> +		local_debug("%s\n", "running i915 device perf healthcheck");
> +		priv->failure = "Device perf healthckeck failure!";
> +		if (local_i915_perf_healthcheck(fd_drm))
> +			priv->failure = NULL;
> +	}
> +
>  	fd_drm = close_device(fd_drm, "", "health checked ");
>  	if (closed || fd_drm < -1)	/* update status for post_healthcheck */
>  		priv->fd.drm_hc = fd_drm;
> @@ -553,6 +572,7 @@ igt_main
>  		.fd		= { .drm = -1, .drm_hc = -1, .sysfs_dev = -1, },
>  		.failure	= NULL,
>  		.need_healthcheck = true,
> +		.has_intel_perf = false,
>  	};
>  
>  	igt_fixture {
> @@ -567,6 +587,8 @@ igt_main
>  			gem_quiescent_gpu(fd_drm);
>  			igt_require_gem(fd_drm);
>  
> +			priv.has_intel_perf = local_i915_perf_healthcheck(fd_drm);
> +
>  			/**
>  			 * FIXME: Unbinding the i915 driver on some Haswell
>  			 * platforms with Azalia audio results in a kernel WARN
> diff --git a/tests/meson.build b/tests/meson.build
> index 3e3db7d5b..3f6dc4fe3 100644
> --- a/tests/meson.build
> +++ b/tests/meson.build
> @@ -3,7 +3,6 @@ test_progs = [
>  	'core_getclient',
>  	'core_getstats',
>  	'core_getversion',
> -	'core_hotunplug',
>  	'core_setmaster',
>  	'core_setmaster_vs_auth',
>  	'debugfs_test',
> @@ -361,6 +360,13 @@ test_executables += executable('perf',
>  	   install : true)
>  test_list += 'perf'
>  
> +test_executables += executable('core_hotunplug', 'core_hotunplug.c',
> +	   dependencies : test_deps + [ lib_igt_i915_perf ],
> +	   install_dir : libexecdir,
> +	   install_rpath : libexecdir_rpathdir,
> +	   install : true)
> +test_list += 'core_hotunplug'
> +
>  executable('testdisplay', ['testdisplay.c', 'testdisplay_hotplug.c'],
>  	   dependencies : test_deps,
>  	   install_dir : libexecdir,
>