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intel/fs: Implement representation of SWSB cross-pipeline synchronization annotations.

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The execution units of XeHP platforms have multiple asynchronous ALU
pipelines instead of (as far as software is concerned) the single
in-order pipeline that handled most ALU instructions except for
extended math in the original Xe.  It's now the compiler's
responsibility to identify cross-pipeline dependencies and insert
synchronization annotations whenever necessary, which are encoded as
some additional bits of the SWSB instruction field.

This commit represents the cross-pipeline synchronization annotations
as part of the existing tgl_swsb structure used for codegen.  The
existing tgl_swsb_*() helpers used by hand-crafted assembly are
extended to default to TGL_PIPE_ALL big-hammer synchronization in
order to ensure backwards compatibility with the existing assembly.
The following commits will extend the software scoreboard lowering
pass in order to keep track of cross-pipeline dependencies across IR
instructions, and insert more specific pipeline annotations in the
SWSB field.

The disassembler is also extended here to print out any existing
pipeline sync annotations.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10000>
This commit is contained in:
Francisco Jerez
2021-04-06 13:03:45 -07:00
committed by Marge Bot
parent d53fc2240b
commit 12479abded
3 changed files with 55 additions and 11 deletions
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12
src/intel/compiler/brw_disasm.c
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@@ -1642,10 +1642,16 @@ qtr_ctrl(FILE *file, const struct gen_device_info *devinfo, const brw_inst *inst
static int
swsb(FILE *file, const struct gen_device_info *devinfo, const brw_inst *inst)
{
const struct tgl_swsb swsb = tgl_swsb_decode(brw_inst_opcode(devinfo, inst),
brw_inst_swsb(devinfo, inst));
const enum opcode opcode = brw_inst_opcode(devinfo, inst);
const uint8_t x = brw_inst_swsb(devinfo, inst);
const struct tgl_swsb swsb = tgl_swsb_decode(devinfo, opcode, x);
if (swsb.regdist)
format(file, " @%d", swsb.regdist);
format(file, " %s@%d",
(swsb.pipe == TGL_PIPE_FLOAT ? "F" :
swsb.pipe == TGL_PIPE_INT ? "I" :
swsb.pipe == TGL_PIPE_LONG ? "L" :
swsb.pipe == TGL_PIPE_ALL ? "A" : "" ),
swsb.regdist);
if (swsb.mode)
format(file, " $%d%s", swsb.sbid,
(swsb.mode & TGL_SBID_SET ? "" :