i965: Attempt to un-muddle Gen6 data port message target defines.

These are documented on page 245 of IHD_OS_Vol4_Part2.pdf (the public
Sandybridge documentation/SEND instruction description).

Somebody had the bright idea to reuse gen4/5 defines labelled READ/WRITE
which just happened to be the same values as Render Cache/Sampler Cache.
It turns out that this field has nothing to do with READ/WRITE on
Sandybridge, but rather represents which data port to direct it to.

This was especially confusing in brw_set_dp_read_message, which
used "BRW_MESSAGE_TARGET_DATAPORT_WRITE."  In a read function.

Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>

2 files changed, 9 insertions, 6 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_defines.h b/src/mesa/drivers/dri/i965/brw_defines.h
index 3b4b8135976..fd5227d2c55 100644
--- a/src/mesa/drivers/dri/i965/brw_defines.h
+++ b/src/mesa/drivers/dri/i965/brw_defines.h
@@ -663,11 +663,14 @@
 #define BRW_MESSAGE_TARGET_MATH               1 /* reserved on GEN6 */
 #define BRW_MESSAGE_TARGET_SAMPLER            2
 #define BRW_MESSAGE_TARGET_GATEWAY            3
-#define BRW_MESSAGE_TARGET_DATAPORT_READ      4 /* sampler cache on GEN6 */
-#define BRW_MESSAGE_TARGET_DATAPORT_WRITE     5 /* render cache on Gen6 */
+#define BRW_MESSAGE_TARGET_DATAPORT_READ      4
+#define BRW_MESSAGE_TARGET_DATAPORT_WRITE     5
 #define BRW_MESSAGE_TARGET_URB                6
 #define BRW_MESSAGE_TARGET_THREAD_SPAWNER     7
-#define BRW_MESSAGE_TARGET_CONST_CACHE	      9 /* GEN6 */
+
+#define GEN6_MESSAGE_TARGET_DP_SAMPLER_CACHE  4
+#define GEN6_MESSAGE_TARGET_DP_RENDER_CACHE   5
+#define GEN6_MESSAGE_TARGET_DP_CONST_CACHE    9
 
 #define BRW_SAMPLER_RETURN_FORMAT_FLOAT32     0
 #define BRW_SAMPLER_RETURN_FORMAT_UINT32      2
diff --git a/src/mesa/drivers/dri/i965/brw_eu_emit.c b/src/mesa/drivers/dri/i965/brw_eu_emit.c
index 859068ec4eb..82b71374343 100644
--- a/src/mesa/drivers/dri/i965/brw_eu_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_eu_emit.c
@@ -498,7 +498,7 @@ static void brw_set_dp_write_message( struct brw_context *brw,
        insn->bits3.dp_render_cache.end_of_thread = end_of_thread;
 
        /* We always use the render cache for write messages */
-       insn->header.destreg__conditionalmod = BRW_MESSAGE_TARGET_DATAPORT_WRITE;
+       insn->header.destreg__conditionalmod = GEN6_MESSAGE_TARGET_DP_RENDER_CACHE;
    } else if (intel->gen == 5) {
        insn->bits3.dp_write_gen5.binding_table_index = binding_table_index;
        insn->bits3.dp_write_gen5.msg_control = msg_control;
@@ -541,9 +541,9 @@ brw_set_dp_read_message(struct brw_context *brw,
        uint32_t target_function;
 
        if (target_cache == BRW_DATAPORT_READ_TARGET_DATA_CACHE)
-	  target_function = BRW_MESSAGE_TARGET_DATAPORT_READ; /* data cache */
+	  target_function = GEN6_MESSAGE_TARGET_DP_SAMPLER_CACHE;
        else
-	  target_function = BRW_MESSAGE_TARGET_DATAPORT_WRITE; /* render cache */
+	  target_function = GEN6_MESSAGE_TARGET_DP_RENDER_CACHE;
 
        insn->bits3.dp_render_cache.binding_table_index = binding_table_index;
        insn->bits3.dp_render_cache.msg_control = msg_control;