Merge tag 'drm-intel-next-2018-09-06-2' of git://anongit.freedesktop.org/drm/drm...

[thirdparty/linux.git] / drivers / gpu / drm / i915 / gvt / handlers.c

diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
index ff4435432dc96ff897134fbab3d631388f35cd94..d26258786e3ff90ed959ca7aab253b7939594a08 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/handlers.c
+++ b/drivers/gpu/drm/i915/gvt/handlers.c
@@ -3376,6 +3376,30 @@ int intel_vgpu_default_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
        return 0;
 }
 
+/**
+ * intel_vgpu_mask_mmio_write - write mask register
+ * @vgpu: a vGPU
+ * @offset: access offset
+ * @p_data: write data buffer
+ * @bytes: access data length
+ *
+ * Returns:
+ * Zero on success, negative error code if failed.
+ */
+int intel_vgpu_mask_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
+               void *p_data, unsigned int bytes)
+{
+       u32 mask, old_vreg;
+
+       old_vreg = vgpu_vreg(vgpu, offset);
+       write_vreg(vgpu, offset, p_data, bytes);
+       mask = vgpu_vreg(vgpu, offset) >> 16;
+       vgpu_vreg(vgpu, offset) = (old_vreg & ~mask) |
+                               (vgpu_vreg(vgpu, offset) & mask);
+
+       return 0;
+}
+
 /**
  * intel_gvt_in_force_nonpriv_whitelist - if a mmio is in whitelist to be
  * force-nopriv register