Re: [PATCH v13 02/21] drm/i915/guc: Sanitize module parameter guc_log_level

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On Wed, 11 Oct 2017 10:53:57 +0200, Sagar Arun Kamble <sagar.a.kamble@xxxxxxxxx> wrote:

Parameter guc_log_level needs to be sanitized based on GuC support and
enable_guc_loading parameter since it depends on them like
enable_guc_submission. This will make GuC logging paths independent of
enable_guc_submission parameter in further patches.

Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@xxxxxxxxx>
Cc: Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>
Cc: Michał Winiarski <michal.winiarski@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/intel_uc.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
index b33d469..3cf3cbd 100644
--- a/drivers/gpu/drm/i915/intel_uc.c
+++ b/drivers/gpu/drm/i915/intel_uc.c
@@ -56,6 +56,7 @@ void intel_uc_sanitize_options(struct drm_i915_private *dev_priv)

Btw, I think the message "Ignoring GuC options, no hardware\n" is also
applicable when user specified guc_log_level>=0. Please update condition
that controls that message.

		i915_modparams.enable_guc_loading = 0;
 		i915_modparams.enable_guc_submission = 0;
+		i915_modparams.guc_log_level = -1;
 		return;
 	}
@@ -72,9 +73,11 @@ void intel_uc_sanitize_options(struct drm_i915_private *dev_priv)
 			i915_modparams.enable_guc_loading = 0;
 	}
-	/* Can't enable guc submission without guc loaded */
-	if (!i915_modparams.enable_guc_loading)
+	/* Can't enable guc submission and logging without guc loaded */
+	if (!i915_modparams.enable_guc_loading) {
 		i915_modparams.enable_guc_submission = 0;
+		i915_modparams.guc_log_level = -1;
+	}
	/* A negative value means "use platform default" */
 	if (i915_modparams.enable_guc_submission < 0)

Looks good, but please also update condition in i915_guc_log_register()
as we may now rely only on sanitized guc_log_level:

void i915_guc_log_register(struct drm_i915_private *dev_priv)
{
	if (!i915_modparams.enable_guc_submission ||
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
	    (i915_modparams.guc_log_level < 0))
		return;

Also, maybe it is worth to update DOC in intel_guc_log.c and param
description in i915_params.c to indicate (obvious) dependency on guc.

Michal
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