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3ce249e65e
We want to use this in GL too. Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10541>
81 lines
3.3 KiB
C
81 lines
3.3 KiB
C
/*
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* Copyright © 2021 Raspberry Pi
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include "v3d_util.h"
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#include "util/macros.h"
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/* Choose a number of workgroups per supergroup that maximizes
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* lane occupancy. We can pack up to 16 workgroups into a supergroup.
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*/
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uint32_t
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v3d_csd_choose_workgroups_per_supergroup(struct v3d_device_info *devinfo,
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bool has_tsy_barrier,
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uint32_t threads,
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uint32_t num_wgs,
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uint32_t wg_size)
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{
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/* Compute maximum number of batches in a supergroup for this workgroup size.
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* Each batch is 16 elements, and we can have up to 16 work groups in a
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* supergroup:
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*
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* max_batches_per_sg = (wg_size * max_wgs_per_sg) / elements_per_batch
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* since max_wgs_per_sg = 16 and elements_per_batch = 16, we get:
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* max_batches_per_sg = wg_size
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*/
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uint32_t max_batches_per_sg = wg_size;
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/* QPU threads will stall at TSY barriers until the entire supergroup
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* reaches the barrier. Limit the supergroup size to half the QPU threads
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* available, so we can have at least 2 supergroups executing in parallel
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* and we don't stall all our QPU threads when a supergroup hits a barrier.
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*/
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if (has_tsy_barrier) {
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uint32_t max_qpu_threads = devinfo->qpu_count * threads;
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max_batches_per_sg = MIN2(max_batches_per_sg, max_qpu_threads / 2);
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}
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uint32_t max_wgs_per_sg = max_batches_per_sg * 16 / wg_size;
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uint32_t best_wgs_per_sg = 1;
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uint32_t best_unused_lanes = 16;
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for (uint32_t wgs_per_sg = 1; wgs_per_sg <= max_wgs_per_sg; wgs_per_sg++) {
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/* Don't try to pack more workgroups per supergroup than the total amount
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* of workgroups dispatched.
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*/
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if (wgs_per_sg > num_wgs)
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return best_wgs_per_sg;
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/* Compute wasted lines for this configuration and keep track of the
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* config with less waste.
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*/
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uint32_t unused_lanes = (16 - ((wgs_per_sg * wg_size) % 16)) & 0x0f;
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if (unused_lanes == 0)
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return wgs_per_sg;
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if (unused_lanes < best_unused_lanes) {
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best_wgs_per_sg = wgs_per_sg;
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best_unused_lanes = unused_lanes;
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}
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}
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return best_wgs_per_sg;
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}
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