i965: Maximum allowed size of SEND messages is 15 (4 bits)

Until now we only used MRFs 1..15 for regular SEND messages, so the
message length could not possibly exceed the maximum size. Soon we'll
allow to use MRF registers 1..23 in gen6, so we need to be careful
not to build messages that can go beyond the limit. That could occur,
specifically, when building URB write messages, which we may need to
split in chunks due to their size. Previously we would simply go and
create a new message when we reached MRF 13 (since 13..15 were
reserved for spilling), now we also want to check the size of the
message explicitly.

Besides adding that condition to split URB write messages properly,
this patch also adds asserts in the generator. Notice that
brw_inst_set_mlen already asserts for this, but asserting in the
generators is easy and can make debugging easier in some cases.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/mesa/drivers/dri/i965/brw_fs_generator.cpp

@@ -1558,6 +1558,8 @@ fs_generator::generate_code(const cfg_t *cfg, int dispatch_width)
       brw_set_default_acc_write_control(p, inst->writes_accumulator);
       brw_set_default_exec_size(p, cvt(inst->exec_size) - 1);
 
+      assert(inst->mlen <= BRW_MAX_MSG_LENGTH);
+
       switch (inst->exec_size) {
       case 1:
       case 2:

src/mesa/drivers/dri/i965/brw_inst.h

@@ -39,6 +39,9 @@
 extern "C" {
 #endif
 
+/** Maximum SEND message length */
+#define BRW_MAX_MSG_LENGTH 15
+
 /* brw_context.h has a forward declaration of brw_inst, so name the struct. */
 typedef struct brw_inst {
    uint64_t data[2];

src/mesa/drivers/dri/i965/brw_vec4_generator.cpp

@@ -1134,6 +1134,8 @@ vec4_generator::generate_code(const cfg_t *cfg)
       brw_set_default_mask_control(p, inst->force_writemask_all);
       brw_set_default_acc_write_control(p, inst->writes_accumulator);
 
+      assert(inst->mlen <= BRW_MAX_MSG_LENGTH);
+
       unsigned pre_emit_nr_insn = p->nr_insn;
 
       if (dst.width == BRW_WIDTH_4) {

src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp

@@ -3318,9 +3318,10 @@ vec4_visitor::emit_vertex()
                        prog_data->vue_map.slot_to_varying[slot]);
 
          /* If this was max_usable_mrf, we can't fit anything more into this
-          * URB WRITE.
+          * URB WRITE. Same thing if we reached the maximum length available.
           */
-         if (mrf > max_usable_mrf) {
+         if (mrf > max_usable_mrf ||
+             align_interleaved_urb_mlen(devinfo, mrf - base_mrf + 1) > BRW_MAX_MSG_LENGTH) {
             slot++;
             break;
          }