i965/fs: Add byte scattered write message and fs support

v2: (Jason Ekstrand)
    - Enable bit_size parameter to scattered messages to enable different
      bitsizes byte/word/dword.
    - Remove use of brw_send_indirect_scattered_message in favor of
      brw_send_indirect_surface_message.
    - Move scattered messages to surface messages namespace.
    - Assert align1 for scattered messages and assume Gen8+.
    - Inline brw_set_dp_byte_scattered_write.
v3: - Remove leftover newline (Topi Pohjolainen)
    - Rename brw_data_size to brw_scattered_data_element and use
      defines instead of an enum (Jason Ekstrand)
    - Assert scattered write for Gen8+ and Haswell (Jason Ekstrand)

Signed-off-by: Jose Maria Casanova Crespo <[email protected]>
Signed-off-by: Alejandro Piñeiro <[email protected]>
Reviewed-by: Jason Ekstrand <[email protected]>

1 files changed, 44 insertions, 0 deletions

diff --git a/src/intel/compiler/brw_eu_emit.c b/src/intel/compiler/brw_eu_emit.c
index ca97ff7325e..bf9d3c945a9 100644
--- a/src/intel/compiler/brw_eu_emit.c
+++ b/src/intel/compiler/brw_eu_emit.c
@@ -2983,6 +2983,50 @@ brw_untyped_surface_write(struct brw_codegen *p,
       p, insn, num_channels);
 }
 
+static unsigned
+brw_byte_scattered_data_element_from_bit_size(unsigned bit_size)
+{
+   switch (bit_size) {
+   case 8:
+      return GEN7_BYTE_SCATTERED_DATA_ELEMENT_BYTE;
+   case 16:
+      return GEN7_BYTE_SCATTERED_DATA_ELEMENT_WORD;
+   case 32:
+      return GEN7_BYTE_SCATTERED_DATA_ELEMENT_DWORD;
+   default:
+      unreachable("Unsupported bit_size for byte scattered messages");
+   }
+}
+
+void
+brw_byte_scattered_write(struct brw_codegen *p,
+                         struct brw_reg payload,
+                         struct brw_reg surface,
+                         unsigned msg_length,
+                         unsigned bit_size)
+{
+   const struct gen_device_info *devinfo = p->devinfo;
+   assert(devinfo->gen > 7 || devinfo->is_haswell);
+   assert(brw_inst_access_mode(devinfo, p->current) == BRW_ALIGN_1);
+   const unsigned sfid = GEN7_SFID_DATAPORT_DATA_CACHE;
+
+   struct brw_inst *insn = brw_send_indirect_surface_message(
+      p, sfid, brw_writemask(brw_null_reg(), WRITEMASK_XYZW),
+      payload, surface, msg_length, 0, true);
+
+   unsigned msg_control =
+      brw_byte_scattered_data_element_from_bit_size(bit_size) << 2;
+
+   if (brw_inst_exec_size(devinfo, p->current) == BRW_EXECUTE_16)
+      msg_control |= 1;
+   else
+      msg_control |= 0;
+
+   brw_inst_set_dp_msg_type(devinfo, insn,
+                            HSW_DATAPORT_DC_PORT0_BYTE_SCATTERED_WRITE);
+   brw_inst_set_dp_msg_control(devinfo, insn, msg_control);
+}
+
 static void
 brw_set_dp_typed_atomic_message(struct brw_codegen *p,
                                 struct brw_inst *insn,