[PATCH 1/2] drm/i915/guc: Don't enable GuC when vGPU is active

Sagar Arun Kamble
2018-01-11T16:34:54Z

In GVT-g, if GuC is to be used it is to be loaded by Host and not by
VM/vGPU. Currently, GVT-g host is not supported with GuC submission.
Also currently vGPU is to be not supported with GuC submission AFAIK.
CI BAT highlighted GuC init issue on skl-gvtdvm due to lack of movntdqa
needed for logging with below warning:

WARN_ON(!i915_memcpy_from_wc(((void *)0), ((void *)0), 0))
WARNING: CPU: 0 PID: 216 at drivers/gpu/drm/i915/intel_guc_log.c:383

This patch disables GuC when vGPU is active.

Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Changbin Du <changbin.du@intel.com>
---
drivers/gpu/drm/i915/intel_uc.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
index d82ca0f..a836cf8 100644
--- a/drivers/gpu/drm/i915/intel_uc.c
+++ b/drivers/gpu/drm/i915/intel_uc.c
@@ -61,6 +61,8 @@ static int __get_platform_enable_guc(struct drm_i915_private *dev_priv)
enable_guc |= ENABLE_GUC_LOAD_HUC;

/* Any platform specific fine-tuning can be done here */
+ if (intel_vgpu_active(dev_priv))
+ enable_guc = 0;

return enable_guc;
}
--
1.9.1