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).
Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
Cc: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/i915_params.c | 4 ++++
2 files changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index ff02225d5edd..610ff70f8609 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1925,6 +1925,7 @@ struct i915_params {
bool prefault_disable;
bool reset;
bool disable_display;
+ bool disable_vtd_wa;
};
extern struct i915_params i915 __read_mostly;
diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index e1027cc5f0ee..60bfcfa2f339 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -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_display, "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)");
--
1.8.5.2
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