[Intel-gfx] [RFC 13/22] drm/i915: Enable bit checking for some commands

[bradley.d.volkin at intel.com]

From: Brad Volkin <bradley.d.volkin at intel.com>

These checks prevent userspace from using certain commands to
access registers or generate interrupts.

OTC-Tracker: AXIA-4631
Change-Id: Ic6367ae98272495ba874c22abd4824fbced0abca
Signed-off-by: Brad Volkin <bradley.d.volkin at intel.com>
---
 drivers/gpu/drm/i915/i915_cmd_parser.c | 41 ++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/i915_reg.h        |  3 +++
 2 files changed, 44 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_cmd_parser.c b/drivers/gpu/drm/i915/i915_cmd_parser.c
index df5424b..b881d39 100644
--- a/drivers/gpu/drm/i915/i915_cmd_parser.c
+++ b/drivers/gpu/drm/i915/i915_cmd_parser.c
@@ -49,6 +49,7 @@
 #define S CMD_DESC_SKIP
 #define R CMD_DESC_REJECT
 #define W CMD_DESC_REGISTER
+#define B CMD_DESC_BITMASK
 
 /*            Command                          Mask   Fixed Len   Action
 	      ---------------------------------------------------------- */
@@ -81,9 +82,23 @@ static const struct drm_i915_cmd_descriptor render_cmds[] = {
 	CMD(  MI_CLFLUSH,                       SMI,   !F,  0x3FF,  S  ),
 	CMD(  GFX_OP_3DSTATE_VF_STATISTICS,     S3D,    F,  1,      S  ),
 	CMD(  PIPELINE_SELECT,                  S3D,    F,  1,      S  ),
+	CMD(  MEDIA_VFE_STATE,			S3D,   !F,  0xFFFF, B,
+	      .bits = {{
+			.offset = 2,
+			.mask = MEDIA_VFE_STATE_MMIO_ACCESS_MASK,
+			.expected = 0
+	      }},
+	      .bits_count = 1					       ),
 	CMD(  GPGPU_OBJECT,                     S3D,   !F,  0xFF,   S  ),
 	CMD(  GPGPU_WALKER,                     S3D,   !F,  0xFF,   S  ),
 	CMD(  GFX_OP_3DSTATE_SO_DECL_LIST,      S3D,   !F,  0x1FF,  S  ),
+	CMD(  GFX_OP_PIPE_CONTROL(5),           S3D,   !F,  0xFF,   B,
+	      .bits = {{
+			.offset = 1,
+			.mask = (PIPE_CONTROL_MMIO_WRITE | PIPE_CONTROL_NOTIFY),
+			.expected = 0
+	      }},
+	      .bits_count = 1					       ),
 };
 
 static const struct drm_i915_cmd_descriptor hsw_render_cmds[] = {
@@ -102,11 +117,35 @@ static const struct drm_i915_cmd_descriptor hsw_render_cmds[] = {
 
 static const struct drm_i915_cmd_descriptor video_cmds[] = {
 	CMD(  MI_ARB_ON_OFF,                    SMI,    F,  1,      R  ),
+	CMD(  MI_FLUSH_DW,                      SMI,   !F,  0x3F,   B,
+	      .bits = {{
+			.offset = 0,
+			.mask = MI_FLUSH_DW_NOTIFY,
+			.expected = 0
+	      }},
+	      .bits_count = 1					       ),
 	CMD(  MFX_WAIT,                         SMFX,  !F,  0x3F,   S  ),
 };
 
+static const struct drm_i915_cmd_descriptor vecs_cmds[] = {
+	CMD(  MI_FLUSH_DW,                      SMI,   !F,  0x3F,   B,
+	      .bits = {{
+			.offset = 0,
+			.mask = MI_FLUSH_DW_NOTIFY,
+			.expected = 0
+	      }},
+	      .bits_count = 1					       ),
+};
+
 static const struct drm_i915_cmd_descriptor blt_cmds[] = {
 	CMD(  MI_DISPLAY_FLIP,                  SMI,   !F,  0xFF,   R  ),
+	CMD(  MI_FLUSH_DW,                      SMI,   !F,  0x3F,   B,
+	      .bits = {{
+			.offset = 0,
+			.mask = MI_FLUSH_DW_NOTIFY,
+			.expected = 0
+	      }},
+	      .bits_count = 1					       ),
 	CMD(  COLOR_BLT,                        S2D,   !F,  0x3F,   S  ),
 	CMD(  SRC_COPY_BLT,                     S2D,   !F,  0x3F,   S  ),
 };
@@ -120,6 +159,7 @@ static const struct drm_i915_cmd_descriptor blt_cmds[] = {
 #undef S
 #undef R
 #undef W
+#undef B
 
 static const struct drm_i915_cmd_table gen7_render_cmds[] = {
 	{ common_cmds, ARRAY_SIZE(common_cmds) },
@@ -139,6 +179,7 @@ static const struct drm_i915_cmd_table gen7_video_cmds[] = {
 
 static const struct drm_i915_cmd_table hsw_vebox_cmds[] = {
 	{ common_cmds, ARRAY_SIZE(common_cmds) },
+	{ vecs_cmds, ARRAY_SIZE(vecs_cmds) },
 };
 
 static const struct drm_i915_cmd_table gen7_blt_cmds[] = {
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index aa43624..0e504b9 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -240,6 +240,7 @@
 #define   MI_FLUSH_DW_STORE_INDEX	(1<<21)
 #define   MI_INVALIDATE_TLB		(1<<18)
 #define   MI_FLUSH_DW_OP_STOREDW	(1<<14)
+#define   MI_FLUSH_DW_NOTIFY		(1<<8)
 #define   MI_INVALIDATE_BSD		(1<<7)
 #define   MI_FLUSH_DW_USE_GTT		(1<<2)
 #define   MI_FLUSH_DW_USE_PPGTT		(0<<2)
@@ -318,6 +319,7 @@
 #define   DISPLAY_PLANE_B           (1<<20)
 #define GFX_OP_PIPE_CONTROL(len)	((0x3<<29)|(0x3<<27)|(0x2<<24)|(len-2))
 #define   PIPE_CONTROL_GLOBAL_GTT_IVB			(1<<24) /* gen7+ */
+#define   PIPE_CONTROL_MMIO_WRITE			(1<<23)
 #define   PIPE_CONTROL_CS_STALL				(1<<20)
 #define   PIPE_CONTROL_TLB_INVALIDATE			(1<<18)
 #define   PIPE_CONTROL_QW_WRITE				(1<<14)
@@ -356,6 +358,7 @@
 #define PIPELINE_SELECT                ((0x3<<29)|(0x1<<27)|(0x1<<24)|(0x4<<16))
 #define GFX_OP_3DSTATE_VF_STATISTICS   ((0x3<<29)|(0x1<<27)|(0x0<<24)|(0xB<<16))
 #define MEDIA_VFE_STATE                ((0x3<<29)|(0x2<<27)|(0x0<<24)|(0x0<<16))
+#define  MEDIA_VFE_STATE_MMIO_ACCESS_MASK (0x18)
 #define GPGPU_OBJECT                   ((0x3<<29)|(0x2<<27)|(0x1<<24)|(0x4<<16))
 #define GPGPU_WALKER                   ((0x3<<29)|(0x2<<27)|(0x1<<24)|(0x5<<16))
 #define GFX_OP_3DSTATE_DX9_CONSTANTF_VS \
-- 
1.8.4.4