diff --git a/drivers/gpu/drm/i915/i915_gem_fence_reg.c b/drivers/gpu/drm/i915/i915_gem_fence_reg.c index 5fe2cd8c8f288..181786d803861 100644 --- a/drivers/gpu/drm/i915/i915_gem_fence_reg.c +++ b/drivers/gpu/drm/i915/i915_gem_fence_reg.c @@ -63,6 +63,7 @@ static void i965_write_fence_reg(struct drm_i915_fence_reg *fence, i915_reg_t fence_reg_lo, fence_reg_hi; int fence_pitch_shift; u64 val; + struct drm_i915_private *dev_priv = fence->i915; if (INTEL_INFO(fence->i915)->gen >= 6) { fence_reg_lo = FENCE_REG_GEN6_LO(fence->id); @@ -92,9 +93,17 @@ static void i965_write_fence_reg(struct drm_i915_fence_reg *fence, val |= I965_FENCE_REG_VALID; } - if (!pipelined) { - struct drm_i915_private *dev_priv = fence->i915; - + if (intel_vgpu_active(dev_priv)) { + /* Use the 64-bit RW to write fence reg on VGPU mode. + * The GVT-g can trap the written val of VGPU to program the + * fence reg. And the fence write in gvt-g follows the + * sequence of off/read/double-write/read. This assures that + * the fence reg is configured as expected. + * At the same time the 64-bit op can help to reduce the num + * of VGPU trap for the fence reg. + */ + I915_WRITE64_FW(fence_reg_lo, val); + } else if (!pipelined) { /* To w/a incoherency with non-atomic 64-bit register updates, * we split the 64-bit update into two 32-bit writes. In order * for a partial fence not to be evaluated between writes, we