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drm/i915: Add debug module option for VTd validation 

VTd has a few too many "outright disable the damn thing" workarounds
accumulated and for validation we want a simple knob to make sure we
disable them all.

Since this is for bdw+ validation and atm we don't have any
workarounds for bdw this option currently does nothing. So currently
this is just a placeholder to make sure reality will match with the
documented process for our validation people.

v2: Fix up param description (Jani).

v3: Actually git add ...

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2014-04-01 09:33:47 +02:00
parent 4b28a1f3ef
commit 7a10dfa638
2 changed files with 5 additions and 0 deletions
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1
drivers/gpu/drm/i915/i915_drv.h
View File

@ -1923,6 +1923,7 @@ struct i915_params {
bool prefault_disable;
bool reset;
bool disable_display;
bool disable_vtd_wa;
};
extern struct i915_params i915 __read_mostly;

4
drivers/gpu/drm/i915/i915_params.c
View File

@ -47,6 +47,7 @@ struct i915_params i915 __read_mostly = {
.invert_brightness = 0,
.disable_display = 0,
.enable_cmd_parser = 1,
.disable_vtd_wa = 0,
};
module_param_named(modeset, i915.modeset, int, 0400);
@ -149,6 +150,9 @@ MODULE_PARM_DESC(invert_brightness,
module_param_named(disable_display, i915.disable_display, bool, 0600);
MODULE_PARM_DESC(disable_display, "Disable display (default: false)");
module_param_named(disable_vtd_wa, i915.disable_vtd_wa, bool, 0600);
MODULE_PARM_DESC(disable_vtd_wa, "Disable all VT-d workarounds (default: false)");
module_param_named(enable_cmd_parser, i915.enable_cmd_parser, int, 0600);
MODULE_PARM_DESC(enable_cmd_parser,
"Enable command parsing (1=enabled [default], 0=disabled)");