From: Zhao Yan <yan.y.zhao@intel.com>
Date: Tue, 8 May 2018 06:52:50 +0000 (+0800)
Subject: drm/i915/gvt: let force_to_nonpriv cmd handler only valid for LRI cmd
X-Git-Tag: v4.18-rc1~128^2~13^2~3^2~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cb8ba171ae6c1e4f5fa027162c06d50fc2b43055;p=thirdparty%2Fkernel%2Flinux.git

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>
---

diff --git a/drivers/gpu/drm/i915/gvt/cmd_parser.c b/drivers/gpu/drm/i915/gvt/cmd_parser.c
index 536cb691a543b..36c6180e57693 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) ||