+++ /dev/null
-/*
- * Copyright © 2020 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 "compiler/v3d_compiler.h"
-#include "compiler/nir/nir_builder.h"
-
-/* Vulkan's robustBufferAccess feature is only concerned with buffers that are
- * bound through descriptor sets, so shared memory is not included, but it may
- * be useful to enable this for debugging.
- */
-const bool robust_shared_enabled = false;
-
-static void
-rewrite_offset(nir_builder *b,
- nir_intrinsic_instr *instr,
- uint32_t type_sz,
- uint32_t buffer_idx,
- uint32_t offset_src,
- nir_intrinsic_op buffer_size_op)
-{
- b->cursor = nir_before_instr(&instr->instr);
-
- /* Get size of the buffer */
- nir_intrinsic_instr *size =
- nir_intrinsic_instr_create(b->shader, buffer_size_op);
- size->src[0] = nir_src_for_ssa(nir_imm_int(b, buffer_idx));
- nir_ssa_dest_init(&size->instr, &size->dest, 1, 32);
- nir_builder_instr_insert(b, &size->instr);
-
- /* Compute the maximum offset being accessed and if it is
- * out of bounds rewrite it to 0 to ensure the access is
- * within bounds.
- */
- const uint32_t access_size = instr->num_components * type_sz;
- nir_ssa_def *max_access_offset =
- nir_iadd(b, instr->src[offset_src].ssa,
- nir_imm_int(b, access_size - 1));
- nir_ssa_def *offset =
- nir_bcsel(b, nir_uge(b, max_access_offset, &size->dest.ssa),
- nir_imm_int(b, 0),
- instr->src[offset_src].ssa);
-
- /* Rewrite offset */
- nir_instr_rewrite_src(&instr->instr, &instr->src[offset_src],
- nir_src_for_ssa(offset));
-}
-
-static void
-lower_buffer_load(struct v3d_compile *c,
- nir_builder *b,
- nir_intrinsic_instr *instr)
-{
- uint32_t type_sz = nir_dest_bit_size(instr->dest) / 8;
- uint32_t index = nir_src_comp_as_uint(instr->src[0], 0);
-
- nir_intrinsic_op op;
- if (instr->intrinsic == nir_intrinsic_load_ubo) {
- op = nir_intrinsic_get_ubo_size;
- if (c->key->environment == V3D_ENVIRONMENT_VULKAN)
- index--;
- } else {
- op = nir_intrinsic_get_ssbo_size;
- }
-
- rewrite_offset(b, instr, type_sz, index, 1, op);
-}
-
-static void
-lower_buffer_store(struct v3d_compile *c,
- nir_builder *b,
- nir_intrinsic_instr *instr)
-{
- uint32_t type_sz = nir_src_bit_size(instr->src[0]) / 8;
- uint32_t index = nir_src_comp_as_uint(instr->src[1], 0);
- rewrite_offset(b, instr, type_sz, index, 2, nir_intrinsic_get_ssbo_size);
-}
-
-static void
-lower_buffer_atomic(struct v3d_compile *c,
- nir_builder *b,
- nir_intrinsic_instr *instr)
-{
- uint32_t index = nir_src_comp_as_uint(instr->src[0], 0);
- rewrite_offset(b, instr, 4, index, 1, nir_intrinsic_get_ssbo_size);
-}
-
-static void
-lower_buffer_shared(struct v3d_compile *c,
- nir_builder *b,
- nir_intrinsic_instr *instr)
-{
- uint32_t type_sz, offset_src;
- if (instr->intrinsic == nir_intrinsic_load_shared) {
- offset_src = 0;
- type_sz = nir_dest_bit_size(instr->dest) / 8;
- } else if (instr->intrinsic == nir_intrinsic_store_shared) {
- offset_src = 1;
- type_sz = nir_src_bit_size(instr->src[0]) / 8;
- } else {
- /* atomic */
- offset_src = 0;
- type_sz = 4;
- }
-
- b->cursor = nir_before_instr(&instr->instr);
- const uint32_t access_size = instr->num_components * type_sz;
- nir_ssa_def *max_access_offset =
- nir_iadd(b, instr->src[offset_src].ssa,
- nir_imm_int(b, access_size - 1));
- nir_ssa_def *offset =
- nir_bcsel(b, nir_uge(b, max_access_offset,
- nir_imm_int(b, c->s->info.shared_size)),
- nir_imm_int(b, 0),
- instr->src[offset_src].ssa);
-
- nir_instr_rewrite_src(&instr->instr, &instr->src[offset_src],
- nir_src_for_ssa(offset));
-}
-
-static bool
-lower_buffer_instr(nir_builder *b, nir_instr *instr, void *_state)
-{
- struct v3d_compile *c = _state;
-
- if (instr->type != nir_instr_type_intrinsic)
- return false;
- nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
-
- switch (intr->intrinsic) {
- case nir_intrinsic_load_ubo:
- if (c->key->robust_uniform_access) {
- lower_buffer_load(c, b, intr);
- return true;
- }
- return false;
- case nir_intrinsic_load_ssbo:
- if (c->key->robust_storage_access) {
- lower_buffer_load(c, b, intr);
- return true;
- }
- return false;
- case nir_intrinsic_store_ssbo:
- if (c->key->robust_storage_access) {
- lower_buffer_store(c, b, intr);
- return true;
- }
- return false;
- case nir_intrinsic_ssbo_atomic:
- if (c->key->robust_storage_access) {
- lower_buffer_atomic(c, b, intr);
- return true;
- }
- return false;
- case nir_intrinsic_store_shared:
- case nir_intrinsic_load_shared:
- case nir_intrinsic_shared_atomic:
- case nir_intrinsic_shared_atomic_swap:
- if (robust_shared_enabled) {
- lower_buffer_shared(c, b, intr);
- return true;
- }
- return false;
- default:
- return false;
- }
-}
-
-static void
-lower_image(struct v3d_compile *c,
- nir_builder *b,
- nir_intrinsic_instr *instr)
-{
- b->cursor = nir_before_instr(&instr->instr);
-
- uint32_t num_coords = nir_image_intrinsic_coord_components(instr);
- bool is_array = nir_intrinsic_image_array(instr);
- uint32_t image_idx = nir_src_as_uint(instr->src[0]);
- nir_ssa_def *coord = instr->src[1].ssa;
-
- /* Get image size */
- nir_intrinsic_instr *size_inst =
- nir_intrinsic_instr_create(c->s, nir_intrinsic_image_size);
- size_inst->src[0] = nir_src_for_ssa(nir_imm_int(b, image_idx));
- size_inst->src[1] = nir_src_for_ssa(nir_imm_int(b, 0));
- nir_intrinsic_set_image_array(size_inst, is_array);
- size_inst->num_components = num_coords;
- nir_ssa_dest_init(&size_inst->instr, &size_inst->dest, num_coords, 32);
- nir_ssa_def *size = &size_inst->dest.ssa;
- nir_builder_instr_insert(b, &size_inst->instr);
-
- /* Emit condition for out-of-bounds access */
- nir_ssa_def *x = nir_channel(b, coord, 0);
- nir_ssa_def *w = nir_channel(b, size, 0);
- nir_ssa_def *oob_cond = nir_uge(b, x, w);
-
- if (num_coords > 1) {
- nir_ssa_def *y = nir_channel(b, coord, 1);
- nir_ssa_def *h = nir_channel(b, size, 1);
- oob_cond = nir_ior(b, oob_cond, nir_uge(b, y, h));
- }
-
- if (num_coords > 2) {
- nir_ssa_def *z = nir_channel(b, coord, 2);
- nir_ssa_def *d = nir_channel(b, size, 2);
- if (nir_intrinsic_image_dim(instr) == GLSL_SAMPLER_DIM_CUBE)
- d = nir_imul_imm(b, d, 6);
- oob_cond = nir_ior(b, oob_cond, nir_uge(b, z, d));
- }
-
- if (instr->intrinsic != nir_intrinsic_image_store) {
- /* For out of bounds loads/atomics we want to return a zero
- * result. Loads may happen on integer or float images, but
- * because a zero vector has the same bit representation for
- * both we don't need to know the image format to return a
- * valid vector.
- *
- * Notice we can't use bcsel for this since we need to prevent
- * execution of the original instruction in case of OOB access.
- */
- nir_ssa_def *res1, *res2;
- nir_push_if(b, oob_cond);
- if (instr->intrinsic == nir_intrinsic_image_load)
- res1 = nir_imm_vec4(b, 0, 0, 0, 0);
- else
- res1 = nir_imm_int(b, 0);
- nir_push_else(b, NULL);
- nir_instr *orig =
- nir_instr_clone(b->shader, &instr->instr);
- nir_builder_instr_insert(b, orig);
- res2 = &nir_instr_as_intrinsic(orig)->dest.ssa;
- nir_pop_if(b, NULL);
- nir_ssa_def *res = nir_if_phi(b, res1, res2);
- nir_ssa_def_rewrite_uses(&instr->dest.ssa, res);
- } else {
- /* Drop OOB stores */
- assert(instr->intrinsic == nir_intrinsic_image_store);
- nir_push_if(b, nir_inot(b, oob_cond));
- nir_instr *orig =
- nir_instr_clone(b->shader, &instr->instr);
- nir_builder_instr_insert(b, orig);
- nir_pop_if(b, NULL);
- }
-
- /* Drop original instruction */
- nir_instr_remove(&instr->instr);
-}
-
-static bool
-lower_image_instr(nir_builder *b, nir_instr *instr, void *_state)
-{
- struct v3d_compile *c = _state;
-
- if (instr->type != nir_instr_type_intrinsic)
- return false;
- nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
-
- switch (intr->intrinsic) {
- case nir_intrinsic_image_load:
- case nir_intrinsic_image_store:
- case nir_intrinsic_image_atomic:
- case nir_intrinsic_image_atomic_swap:
- lower_image(c, b, intr);
- return true;
- default:
- return false;
- }
-}
-
-bool
-v3d_nir_lower_robust_buffer_access(nir_shader *s, struct v3d_compile *c)
-{
- return nir_shader_instructions_pass(s, lower_buffer_instr,
- nir_metadata_block_index |
- nir_metadata_dominance, c);
-}
-
-bool
-v3d_nir_lower_robust_image_access(nir_shader *s, struct v3d_compile *c)
-{
- return nir_shader_instructions_pass(s, lower_image_instr,
- nir_metadata_block_index |
- nir_metadata_dominance, c);
-}
projects / platform / upstream / mesa.git / commitdiff