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/*
* Copyright © 2021 Raspberry Pi Ltd
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "v3d_util.h"
#include "util/macros.h"
/* Choose a number of workgroups per supergroup that maximizes
* lane occupancy. We can pack up to 16 workgroups into a supergroup.
*/
uint32_t
v3d_csd_choose_workgroups_per_supergroup(struct v3d_device_info *devinfo,
bool has_subgroups,
bool has_tsy_barrier,
uint32_t threads,
uint32_t num_wgs,
uint32_t wg_size)
{
/* FIXME: subgroups may restrict supergroup packing. For now, we disable it
* completely if the shader uses subgroups.
*/
if (has_subgroups)
return 1;
/* Compute maximum number of batches in a supergroup for this workgroup size.
* Each batch is 16 elements, and we can have up to 16 work groups in a
* supergroup:
*
* max_batches_per_sg = (wg_size * max_wgs_per_sg) / elements_per_batch
* since max_wgs_per_sg = 16 and elements_per_batch = 16, we get:
* max_batches_per_sg = wg_size
*/
uint32_t max_batches_per_sg = wg_size;
/* QPU threads will stall at TSY barriers until the entire supergroup
* reaches the barrier. Limit the supergroup size to half the QPU threads
* available, so we can have at least 2 supergroups executing in parallel
* and we don't stall all our QPU threads when a supergroup hits a barrier.
*/
if (has_tsy_barrier) {
uint32_t max_qpu_threads = devinfo->qpu_count * threads;
max_batches_per_sg = MIN2(max_batches_per_sg, max_qpu_threads / 2);
}
uint32_t max_wgs_per_sg = max_batches_per_sg * 16 / wg_size;
uint32_t best_wgs_per_sg = 1;
uint32_t best_unused_lanes = 16;
for (uint32_t wgs_per_sg = 1; wgs_per_sg <= max_wgs_per_sg; wgs_per_sg++) {
/* Don't try to pack more workgroups per supergroup than the total amount
* of workgroups dispatched.
*/
if (wgs_per_sg > num_wgs)
return best_wgs_per_sg;
/* Compute wasted lines for this configuration and keep track of the
* config with less waste.
*/
uint32_t unused_lanes = (16 - ((wgs_per_sg * wg_size) % 16)) & 0x0f;
if (unused_lanes == 0)
return wgs_per_sg;
if (unused_lanes < best_unused_lanes) {
best_wgs_per_sg = wgs_per_sg;
best_unused_lanes = unused_lanes;
}
}
return best_wgs_per_sg;
}
void
v3d_choose_tile_size(uint32_t color_attachment_count, uint32_t max_color_bpp,
bool msaa, bool double_buffer,
uint32_t *width, uint32_t *height)
{
static const uint8_t tile_sizes[] = {
64, 64,
64, 32,
32, 32,
32, 16,
16, 16,
16, 8,
8, 8
};
uint32_t idx = 0;
if (color_attachment_count > 2)
idx += 2;
else if (color_attachment_count > 1)
idx += 1;
/* MSAA and double-buffer are mutually exclusive */
assert(!msaa || !double_buffer);
if (msaa)
idx += 2;
else if (double_buffer)
idx += 1;
idx += max_color_bpp;
assert(idx < ARRAY_SIZE(tile_sizes) / 2);
*width = tile_sizes[idx * 2];
*height = tile_sizes[idx * 2 + 1];
}
/* Translates a pipe swizzle to the swizzle values used in the
* TEXTURE_SHADER_STATE packet.
*/
uint32_t
v3d_translate_pipe_swizzle(enum pipe_swizzle swizzle)
{
switch (swizzle) {
case PIPE_SWIZZLE_0:
return 0;
case PIPE_SWIZZLE_1:
return 1;
case PIPE_SWIZZLE_X:
case PIPE_SWIZZLE_Y:
case PIPE_SWIZZLE_Z:
case PIPE_SWIZZLE_W:
return 2 + swizzle;
default:
unreachable("unknown swizzle");
}
}
/* Translates a pipe primitive type to a hw value we can use in the various
* draw packets.
*/
uint32_t
v3d_hw_prim_type(enum pipe_prim_type prim_type)
{
switch (prim_type) {
case PIPE_PRIM_POINTS:
case PIPE_PRIM_LINES:
case PIPE_PRIM_LINE_LOOP:
case PIPE_PRIM_LINE_STRIP:
case PIPE_PRIM_TRIANGLES:
case PIPE_PRIM_TRIANGLE_STRIP:
case PIPE_PRIM_TRIANGLE_FAN:
return prim_type;
case PIPE_PRIM_LINES_ADJACENCY:
case PIPE_PRIM_LINE_STRIP_ADJACENCY:
case PIPE_PRIM_TRIANGLES_ADJACENCY:
case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
return 8 + (prim_type - PIPE_PRIM_LINES_ADJACENCY);
default:
unreachable("Unsupported primitive type");
}
}
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