drm/i915/gvt: let force_to_nonpriv cmd handler only valid for LRI cmd

the cmd_reg_handler() is called by cmds LRM, PIPE_CTRL, SRM...
for LRM, SRM, we cannot get write data in a simple way.
On other side,  the force_to_nonpriv reigsters will only be written in LRI
in current drivers. so we don't want to bother the handler to handle those
memory access cmds, just leave a print message here.

Signed-off-by: Zhao Yan <yan.y.zhao@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

1 files changed, 11 insertions, 3 deletions

diff --git a/drivers/gpu/drm/i915/gvt/cmd_parser.c b/drivers/gpu/drm/i915/gvt/cmd_parser.c
index 536cb691a543..36c6180e5769 100644
--- a/drivers/gpu/drm/i915/gvt/cmd_parser.c
+++ b/drivers/gpu/drm/i915/gvt/cmd_parser.c
@@ -813,14 +813,22 @@ static inline bool is_force_nonpriv_mmio(unsigned int offset)
 }
 
 static int force_nonpriv_reg_handler(struct parser_exec_state *s,
-                                     unsigned int offset, unsigned int index)
+                unsigned int offset, unsigned int index, char *cmd)
 {
         struct intel_gvt *gvt = s->vgpu->gvt;
-        unsigned int data = cmd_val(s, index + 1);
+        unsigned int data;
         u32 ring_base;
         u32 nopid;
         struct drm_i915_private *dev_priv = s->vgpu->gvt->dev_priv;
 
+        if (!strcmp(cmd, "lri"))
+                data = cmd_val(s, index + 1);
+        else {
+                gvt_err("Unexpected forcenonpriv 0x%x write from cmd %s\n",
+                        offset, cmd);
+                return -EINVAL;
+        }
+
         ring_base = dev_priv->engine[s->ring_id]->mmio_base;
         nopid = i915_mmio_reg_offset(RING_NOPID(ring_base));
 
@@ -877,7 +885,7 @@ static int cmd_reg_handler(struct parser_exec_state *s,
                 return -EINVAL;
 
         if (is_force_nonpriv_mmio(offset) &&
-                force_nonpriv_reg_handler(s, offset, index))
+                force_nonpriv_reg_handler(s, offset, index, cmd))
                 return -EPERM;
 
         if (offset == i915_mmio_reg_offset(DERRMR) ||