/* * Copyright © 2019 Intel Corporation * * 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 "anv_nir.h" #include "nir_builder.h" #include "compiler/elk/elk_nir.h" #include "util/mesa-sha1.h" #define sizeof_field(type, field) sizeof(((type *)0)->field) void anv_nir_compute_push_layout(nir_shader *nir, const struct anv_physical_device *pdevice, enum elk_robustness_flags robust_flags, struct elk_stage_prog_data *prog_data, struct anv_pipeline_bind_map *map, void *mem_ctx) { const struct elk_compiler *compiler = pdevice->compiler; memset(map->push_ranges, 0, sizeof(map->push_ranges)); bool has_const_ubo = false; unsigned push_start = UINT_MAX, push_end = 0; nir_foreach_function_impl(impl, nir) { nir_foreach_block(block, impl) { nir_foreach_instr(instr, block) { if (instr->type != nir_instr_type_intrinsic) continue; nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr); switch (intrin->intrinsic) { case nir_intrinsic_load_ubo: if (nir_src_is_const(intrin->src[0]) && nir_src_is_const(intrin->src[1])) has_const_ubo = true; break; case nir_intrinsic_load_push_constant: { unsigned base = nir_intrinsic_base(intrin); unsigned range = nir_intrinsic_range(intrin); push_start = MIN2(push_start, base); push_end = MAX2(push_end, base + range); break; } default: break; } } } } const bool has_push_intrinsic = push_start <= push_end; const bool push_ubo_ranges = pdevice->info.verx10 >= 75 && has_const_ubo && nir->info.stage != MESA_SHADER_COMPUTE; if (push_ubo_ranges && (robust_flags & ELK_ROBUSTNESS_UBO)) { /* We can't on-the-fly adjust our push ranges because doing so would * mess up the layout in the shader. When robustBufferAccess is * enabled, we push a mask into the shader indicating which pushed * registers are valid and we zero out the invalid ones at the top of * the shader. */ const uint32_t push_reg_mask_start = offsetof(struct anv_push_constants, push_reg_mask[nir->info.stage]); const uint32_t push_reg_mask_end = push_reg_mask_start + sizeof(uint64_t); push_start = MIN2(push_start, push_reg_mask_start); push_end = MAX2(push_end, push_reg_mask_end); } if (nir->info.stage == MESA_SHADER_COMPUTE) { /* For compute shaders, we always have to have the subgroup ID. The * back-end compiler will "helpfully" add it for us in the last push * constant slot. Yes, there is an off-by-one error here but that's * because the back-end will add it so we want to claim the number of * push constants one dword less than the full amount including * gl_SubgroupId. */ assert(push_end <= offsetof(struct anv_push_constants, cs.subgroup_id)); push_end = offsetof(struct anv_push_constants, cs.subgroup_id); } /* Align push_start down to a 32B boundary and make it no larger than * push_end (no push constants is indicated by push_start = UINT_MAX). */ push_start = MIN2(push_start, push_end); push_start = ROUND_DOWN_TO(push_start, 32); /* For vec4 our push data size needs to be aligned to a vec4 and for * scalar, it needs to be aligned to a DWORD. */ const unsigned alignment = compiler->scalar_stage[nir->info.stage] ? 4 : 16; nir->num_uniforms = ALIGN(push_end - push_start, alignment); prog_data->nr_params = nir->num_uniforms / 4; prog_data->param = rzalloc_array(mem_ctx, uint32_t, prog_data->nr_params); struct anv_push_range push_constant_range = { .set = ANV_DESCRIPTOR_SET_PUSH_CONSTANTS, .start = push_start / 32, .length = DIV_ROUND_UP(push_end - push_start, 32), }; if (has_push_intrinsic) { nir_foreach_function_impl(impl, nir) { nir_foreach_block(block, impl) { nir_foreach_instr_safe(instr, block) { if (instr->type != nir_instr_type_intrinsic) continue; nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr); switch (intrin->intrinsic) { case nir_intrinsic_load_push_constant: { /* With bindless shaders we load uniforms with SEND * messages. All the push constants are located after the * RT_DISPATCH_GLOBALS. We just need to add the offset to * the address right after RT_DISPATCH_GLOBALS (see * elk_nir_lower_rt_intrinsics.c). */ unsigned base_offset = push_start; intrin->intrinsic = nir_intrinsic_load_uniform; nir_intrinsic_set_base(intrin, nir_intrinsic_base(intrin) - base_offset); break; } default: break; } } } } } if (push_ubo_ranges) { elk_nir_analyze_ubo_ranges(compiler, nir, prog_data->ubo_ranges); /* The vec4 back-end pushes at most 32 regs while the scalar back-end * pushes up to 64. This is primarily because the scalar back-end has a * massively more competent register allocator and so the risk of * spilling due to UBO pushing isn't nearly as high. */ const unsigned max_push_regs = compiler->scalar_stage[nir->info.stage] ? 64 : 32; unsigned total_push_regs = push_constant_range.length; for (unsigned i = 0; i < 4; i++) { if (total_push_regs + prog_data->ubo_ranges[i].length > max_push_regs) prog_data->ubo_ranges[i].length = max_push_regs - total_push_regs; total_push_regs += prog_data->ubo_ranges[i].length; } assert(total_push_regs <= max_push_regs); int n = 0; if (push_constant_range.length > 0) map->push_ranges[n++] = push_constant_range; if (robust_flags & ELK_ROBUSTNESS_UBO) { const uint32_t push_reg_mask_offset = offsetof(struct anv_push_constants, push_reg_mask[nir->info.stage]); assert(push_reg_mask_offset >= push_start); prog_data->push_reg_mask_param = (push_reg_mask_offset - push_start) / 4; } unsigned range_start_reg = push_constant_range.length; for (int i = 0; i < 4; i++) { struct elk_ubo_range *ubo_range = &prog_data->ubo_ranges[i]; if (ubo_range->length == 0) continue; if (n >= 4 || (n == 3 && compiler->constant_buffer_0_is_relative)) { memset(ubo_range, 0, sizeof(*ubo_range)); continue; } const struct anv_pipeline_binding *binding = &map->surface_to_descriptor[ubo_range->block]; map->push_ranges[n++] = (struct anv_push_range) { .set = binding->set, .index = binding->index, .dynamic_offset_index = binding->dynamic_offset_index, .start = ubo_range->start, .length = ubo_range->length, }; /* We only bother to shader-zero pushed client UBOs */ if (binding->set < MAX_SETS && (robust_flags & ELK_ROBUSTNESS_UBO)) { prog_data->zero_push_reg |= BITFIELD64_RANGE(range_start_reg, ubo_range->length); } range_start_reg += ubo_range->length; } } else { /* For Ivy Bridge, the push constants packets have a different * rule that would require us to iterate in the other direction * and possibly mess around with dynamic state base address. * Don't bother; just emit regular push constants at n = 0. * * In the compute case, we don't have multiple push ranges so it's * better to just provide one in push_ranges[0]. */ map->push_ranges[0] = push_constant_range; } /* Now that we're done computing the push constant portion of the * bind map, hash it. This lets us quickly determine if the actual * mapping has changed and not just a no-op pipeline change. */ _mesa_sha1_compute(map->push_ranges, sizeof(map->push_ranges), map->push_sha1); } void anv_nir_validate_push_layout(struct elk_stage_prog_data *prog_data, struct anv_pipeline_bind_map *map) { #ifndef NDEBUG unsigned prog_data_push_size = DIV_ROUND_UP(prog_data->nr_params, 8); for (unsigned i = 0; i < 4; i++) prog_data_push_size += prog_data->ubo_ranges[i].length; unsigned bind_map_push_size = 0; for (unsigned i = 0; i < 4; i++) bind_map_push_size += map->push_ranges[i].length; /* We could go through everything again but it should be enough to assert * that they push the same number of registers. This should alert us if * the back-end compiler decides to re-arrange stuff or shrink a range. */ assert(prog_data_push_size == bind_map_push_size); #endif }