diff options
Diffstat (limited to 'src/freedreno/ir3/ir3_a6xx.c')
| -rw-r--r-- | src/freedreno/ir3/ir3_a6xx.c | 441 |
1 files changed, 441 insertions, 0 deletions
diff --git a/src/freedreno/ir3/ir3_a6xx.c b/src/freedreno/ir3/ir3_a6xx.c new file mode 100644 index 00000000000..7330acc7063 --- /dev/null +++ b/src/freedreno/ir3/ir3_a6xx.c @@ -0,0 +1,441 @@ +/* + * Copyright (C) 2017-2018 Rob Clark <[email protected]> + * + * 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. + * + * Authors: + * Rob Clark <[email protected]> + */ + +#define GPU 600 + +#include "ir3_context.h" +#include "ir3_image.h" + +/* + * Handlers for instructions changed/added in a6xx: + * + * Starting with a6xx, isam and stbi is used for SSBOs as well; stbi and the + * atomic instructions (used for both SSBO and image) use a new instruction + * encoding compared to a4xx/a5xx. + */ + + +static struct ir3_instruction * +ssbo_offset(struct ir3_block *b, struct ir3_instruction *byte_offset) +{ + /* TODO hardware wants offset in terms of elements, not bytes. Which + * is kinda nice but opposite of what nir does. It would be nice if + * we had a way to request the units of the offset to avoid the extra + * shift instructions.. + */ + return ir3_SHR_B(b, byte_offset, 0, create_immed(b, 2), 0); +} + +/* src[] = { buffer_index, offset }. No const_index */ +static void +emit_intrinsic_load_ssbo(struct ir3_context *ctx, nir_intrinsic_instr *intr, + struct ir3_instruction **dst) +{ + struct ir3_block *b = ctx->block; + struct ir3_instruction *offset; + struct ir3_instruction *sam; + nir_const_value *buffer_index; + + /* can this be non-const buffer_index? how do we handle that? */ + buffer_index = nir_src_as_const_value(intr->src[0]); + compile_assert(ctx, buffer_index); + + int tex_idx = ir3_ssbo_to_tex(&ctx->so->image_mapping, buffer_index->u32[0]); + + offset = ssbo_offset(b, ir3_get_src(ctx, &intr->src[1])[0]); + + /* Because texture state for SSBO read is setup as a single component + * format (ie. R32_UINT, etc), we can't read more than the .x component + * in one shot. Maybe there is some way we could mangle the state to + * read more than one component at a shot, which would result is some- + * what less register usage (given how we have to stick in the dummy + * .y coord) and less alu instructions to calc offsets. But this is + * also what blob does, so meh? + */ + for (unsigned i; i < intr->num_components; i++) { + struct ir3_instruction *coords[2]; + + coords[0] = (i == 0) ? offset : + ir3_ADD_U(b, offset, 0, create_immed(b, i), 0); + coords[1] = create_immed(b, 0); + + sam = ir3_SAM(b, OPC_ISAM, TYPE_U32, 0b1, 0, + tex_idx, tex_idx, ir3_create_collect(ctx, coords, 2), NULL); + + sam->barrier_class = IR3_BARRIER_IMAGE_R; + sam->barrier_conflict = IR3_BARRIER_IMAGE_W; + + dst[i] = sam; + } +} + +/* src[] = { value, block_index, offset }. const_index[] = { write_mask } */ +static void +emit_intrinsic_store_ssbo(struct ir3_context *ctx, nir_intrinsic_instr *intr) +{ + struct ir3_block *b = ctx->block; + struct ir3_instruction *stib, *val, *offset; + nir_const_value *buffer_index; + /* TODO handle wrmask properly, see _store_shared().. but I think + * it is more a PITA than that, since blob ends up loading the + * masked components and writing them back out. + */ + unsigned wrmask = intr->const_index[0]; + unsigned ncomp = ffs(~wrmask) - 1; + + /* can this be non-const buffer_index? how do we handle that? */ + buffer_index = nir_src_as_const_value(intr->src[1]); + compile_assert(ctx, buffer_index); + + int ibo_idx = ir3_ssbo_to_ibo(&ctx->so->image_mapping, buffer_index->u32[0]); + + /* src0 is offset, src1 is value: + */ + val = ir3_create_collect(ctx, ir3_get_src(ctx, &intr->src[0]), ncomp); + offset = ssbo_offset(b, ir3_get_src(ctx, &intr->src[2])[0]); + + stib = ir3_STIB(b, create_immed(b, ibo_idx), 0, offset, 0, val, 0); + stib->cat6.iim_val = ncomp; + stib->cat6.d = 1; + stib->cat6.type = TYPE_U32; + stib->barrier_class = IR3_BARRIER_BUFFER_W; + stib->barrier_conflict = IR3_BARRIER_BUFFER_R | IR3_BARRIER_BUFFER_W; + + array_insert(b, b->keeps, stib); +} + +/* + * SSBO atomic intrinsics + * + * All of the SSBO atomic memory operations read a value from memory, + * compute a new value using one of the operations below, write the new + * value to memory, and return the original value read. + * + * All operations take 3 sources except CompSwap that takes 4. These + * sources represent: + * + * 0: The SSBO buffer index. + * 1: The offset into the SSBO buffer of the variable that the atomic + * operation will operate on. + * 2: The data parameter to the atomic function (i.e. the value to add + * in ssbo_atomic_add, etc). + * 3: For CompSwap only: the second data parameter. + */ +static struct ir3_instruction * +emit_intrinsic_atomic_ssbo(struct ir3_context *ctx, nir_intrinsic_instr *intr) +{ + struct ir3_block *b = ctx->block; + struct ir3_instruction *atomic, *ibo, *src0, *src1, *offset, *data, *dummy; + nir_const_value *buffer_index; + type_t type = TYPE_U32; + + /* can this be non-const buffer_index? how do we handle that? */ + buffer_index = nir_src_as_const_value(intr->src[0]); + compile_assert(ctx, buffer_index); + + int ibo_idx = ir3_ssbo_to_ibo(&ctx->so->image_mapping, buffer_index->u32[0]); + ibo = create_immed(b, ibo_idx); + + offset = ir3_get_src(ctx, &intr->src[1])[0]; + data = ir3_get_src(ctx, &intr->src[2])[0]; + + /* So this gets a bit creative: + * + * src0 - vecN offset/coords + * src1.x - is actually destination register + * src1.y - is 'data' except for cmpxchg where src2.y is 'compare' + * src1.z - is 'data' for cmpxchg + * + * The combining src and dest kinda doesn't work out so well with how + * scheduling and RA work. So for now we create a dummy src2.x, and + * then in a later fixup path, insert an extra MOV out of src1.x. + * See ir3_a6xx_fixup_atomic_dests(). + * + * Note that nir already multiplies the offset by four + */ + dummy = create_immed(b, 0); + src0 = ssbo_offset(b, offset); + + if (intr->intrinsic == nir_intrinsic_ssbo_atomic_comp_swap) { + struct ir3_instruction *compare = ir3_get_src(ctx, &intr->src[3])[0]; + src1 = ir3_create_collect(ctx, (struct ir3_instruction*[]){ + dummy, compare, data + }, 3); + } else { + src1 = ir3_create_collect(ctx, (struct ir3_instruction*[]){ + dummy, data + }, 2); + } + + switch (intr->intrinsic) { + case nir_intrinsic_ssbo_atomic_add: + atomic = ir3_ATOMIC_ADD_G(b, ibo, 0, src0, 0, src1, 0); + break; + case nir_intrinsic_ssbo_atomic_imin: + atomic = ir3_ATOMIC_MIN_G(b, ibo, 0, src0, 0, src1, 0); + type = TYPE_S32; + break; + case nir_intrinsic_ssbo_atomic_umin: + atomic = ir3_ATOMIC_MIN_G(b, ibo, 0, src0, 0, src1, 0); + break; + case nir_intrinsic_ssbo_atomic_imax: + atomic = ir3_ATOMIC_MAX_G(b, ibo, 0, src0, 0, src1, 0); + type = TYPE_S32; + break; + case nir_intrinsic_ssbo_atomic_umax: + atomic = ir3_ATOMIC_MAX_G(b, ibo, 0, src0, 0, src1, 0); + break; + case nir_intrinsic_ssbo_atomic_and: + atomic = ir3_ATOMIC_AND_G(b, ibo, 0, src0, 0, src1, 0); + break; + case nir_intrinsic_ssbo_atomic_or: + atomic = ir3_ATOMIC_OR_G(b, ibo, 0, src0, 0, src1, 0); + break; + case nir_intrinsic_ssbo_atomic_xor: + atomic = ir3_ATOMIC_XOR_G(b, ibo, 0, src0, 0, src1, 0); + break; + case nir_intrinsic_ssbo_atomic_exchange: + atomic = ir3_ATOMIC_XCHG_G(b, ibo, 0, src0, 0, src1, 0); + break; + case nir_intrinsic_ssbo_atomic_comp_swap: + atomic = ir3_ATOMIC_CMPXCHG_G(b, ibo, 0, src0, 0, src1, 0); + break; + default: + unreachable("boo"); + } + + atomic->cat6.iim_val = 1; + atomic->cat6.d = 1; + atomic->cat6.type = type; + atomic->barrier_class = IR3_BARRIER_BUFFER_W; + atomic->barrier_conflict = IR3_BARRIER_BUFFER_R | IR3_BARRIER_BUFFER_W; + + /* even if nothing consume the result, we can't DCE the instruction: */ + array_insert(b, b->keeps, atomic); + + return atomic; +} + +/* src[] = { deref, coord, sample_index, value }. const_index[] = {} */ +static void +emit_intrinsic_store_image(struct ir3_context *ctx, nir_intrinsic_instr *intr) +{ + struct ir3_block *b = ctx->block; + const nir_variable *var = nir_intrinsic_get_var(intr, 0); + struct ir3_instruction *stib; + struct ir3_instruction * const *value = ir3_get_src(ctx, &intr->src[3]); + struct ir3_instruction * const *coords = ir3_get_src(ctx, &intr->src[1]); + unsigned ncoords = ir3_get_image_coords(var, NULL); + unsigned slot = ir3_get_image_slot(nir_src_as_deref(intr->src[0])); + unsigned ibo_idx = ir3_image_to_ibo(&ctx->so->image_mapping, slot); + unsigned ncomp = ir3_get_num_components_for_glformat(var->data.image.format); + + /* src0 is offset, src1 is value: + */ + stib = ir3_STIB(b, create_immed(b, ibo_idx), 0, + ir3_create_collect(ctx, coords, ncoords), 0, + ir3_create_collect(ctx, value, ncomp), 0); + stib->cat6.iim_val = ncomp; + stib->cat6.d = ncoords; + stib->cat6.type = ir3_get_image_type(var); + stib->cat6.typed = true; + stib->barrier_class = IR3_BARRIER_IMAGE_W; + stib->barrier_conflict = IR3_BARRIER_IMAGE_R | IR3_BARRIER_IMAGE_W; + + array_insert(b, b->keeps, stib); +} + +/* src[] = { deref, coord, sample_index, value, compare }. const_index[] = {} */ +static struct ir3_instruction * +emit_intrinsic_atomic_image(struct ir3_context *ctx, nir_intrinsic_instr *intr) +{ + struct ir3_block *b = ctx->block; + const nir_variable *var = nir_intrinsic_get_var(intr, 0); + struct ir3_instruction *atomic, *ibo, *src0, *src1, *dummy; + struct ir3_instruction * const *coords = ir3_get_src(ctx, &intr->src[1]); + struct ir3_instruction *value = ir3_get_src(ctx, &intr->src[3])[0]; + unsigned ncoords = ir3_get_image_coords(var, NULL); + unsigned slot = ir3_get_image_slot(nir_src_as_deref(intr->src[0])); + unsigned ibo_idx = ir3_image_to_ibo(&ctx->so->image_mapping, slot); + + ibo = create_immed(b, ibo_idx); + + /* So this gets a bit creative: + * + * src0 - vecN offset/coords + * src1.x - is actually destination register + * src1.y - is 'value' except for cmpxchg where src2.y is 'compare' + * src1.z - is 'value' for cmpxchg + * + * The combining src and dest kinda doesn't work out so well with how + * scheduling and RA work. So for now we create a dummy src2.x, and + * then in a later fixup path, insert an extra MOV out of src1.x. + * See ir3_a6xx_fixup_atomic_dests(). + */ + dummy = create_immed(b, 0); + src0 = ir3_create_collect(ctx, coords, ncoords); + + if (intr->intrinsic == nir_intrinsic_image_deref_atomic_comp_swap) { + struct ir3_instruction *compare = ir3_get_src(ctx, &intr->src[4])[0]; + src1 = ir3_create_collect(ctx, (struct ir3_instruction*[]){ + dummy, compare, value + }, 3); + } else { + src1 = ir3_create_collect(ctx, (struct ir3_instruction*[]){ + dummy, value + }, 2); + } + + switch (intr->intrinsic) { + case nir_intrinsic_image_deref_atomic_add: + atomic = ir3_ATOMIC_ADD_G(b, ibo, 0, src0, 0, src1, 0); + break; + case nir_intrinsic_image_deref_atomic_min: + atomic = ir3_ATOMIC_MIN_G(b, ibo, 0, src0, 0, src1, 0); + break; + case nir_intrinsic_image_deref_atomic_max: + atomic = ir3_ATOMIC_MAX_G(b, ibo, 0, src0, 0, src1, 0); + break; + case nir_intrinsic_image_deref_atomic_and: + atomic = ir3_ATOMIC_AND_G(b, ibo, 0, src0, 0, src1, 0); + break; + case nir_intrinsic_image_deref_atomic_or: + atomic = ir3_ATOMIC_OR_G(b, ibo, 0, src0, 0, src1, 0); + break; + case nir_intrinsic_image_deref_atomic_xor: + atomic = ir3_ATOMIC_XOR_G(b, ibo, 0, src0, 0, src1, 0); + break; + case nir_intrinsic_image_deref_atomic_exchange: + atomic = ir3_ATOMIC_XCHG_G(b, ibo, 0, src0, 0, src1, 0); + break; + case nir_intrinsic_image_deref_atomic_comp_swap: + atomic = ir3_ATOMIC_CMPXCHG_G(b, ibo, 0, src0, 0, src1, 0); + break; + default: + unreachable("boo"); + } + + atomic->cat6.iim_val = 1; + atomic->cat6.d = ncoords; + atomic->cat6.type = ir3_get_image_type(var); + atomic->cat6.typed = true; + atomic->barrier_class = IR3_BARRIER_IMAGE_W; + atomic->barrier_conflict = IR3_BARRIER_IMAGE_R | IR3_BARRIER_IMAGE_W; + + /* even if nothing consume the result, we can't DCE the instruction: */ + array_insert(b, b->keeps, atomic); + + return atomic; +} + +const struct ir3_context_funcs ir3_a6xx_funcs = { + .emit_intrinsic_load_ssbo = emit_intrinsic_load_ssbo, + .emit_intrinsic_store_ssbo = emit_intrinsic_store_ssbo, + .emit_intrinsic_atomic_ssbo = emit_intrinsic_atomic_ssbo, + .emit_intrinsic_store_image = emit_intrinsic_store_image, + .emit_intrinsic_atomic_image = emit_intrinsic_atomic_image, +}; + +/* + * Special pass to run after instruction scheduling to insert an + * extra mov from src1.x to dst. This way the other compiler passes + * can ignore this quirk of the new instruction encoding. + * + * This might cause extra complication in the future when we support + * spilling, as I think we'd want to re-run the scheduling pass. One + * possible alternative might be to do this in the RA pass after + * ra_allocate() but before destroying the SSA links. (Ie. we do + * want to know if anything consumes the result of the atomic instr, + * if there is no consumer then inserting the extra mov is pointless. + */ + +static struct ir3_instruction * +get_atomic_dest_mov(struct ir3_instruction *atomic) +{ + /* if we've already created the mov-out, then re-use it: */ + if (atomic->data) + return atomic->data; + + /* extract back out the 'dummy' which serves as stand-in for dest: */ + struct ir3_instruction *src = ssa(atomic->regs[3]); + debug_assert(src->opc == OPC_META_FI); + struct ir3_instruction *dummy = ssa(src->regs[1]); + + struct ir3_instruction *mov = ir3_MOV(atomic->block, dummy, TYPE_U32); + + mov->flags |= IR3_INSTR_SY; + + /* it will have already been appended to the end of the block, which + * isn't where we want it, so fix-up the location: + */ + list_delinit(&mov->node); + list_add(&mov->node, &atomic->node); + + /* And because this is after instruction scheduling, we don't really + * have a good way to know if extra delay slots are needed. For + * example, if the result is consumed by an stib (storeImage()) there + * would be no extra delay slots in place already, but 5 are needed. + * Just plan for the worst and hope nobody looks at the resulting + * code that is generated :-( + */ + struct ir3_instruction *nop = ir3_NOP(atomic->block); + nop->repeat = 5; + + list_delinit(&nop->node); + list_add(&nop->node, &mov->node); + + return atomic->data = mov; +} + +void +ir3_a6xx_fixup_atomic_dests(struct ir3 *ir, struct ir3_shader_variant *so) +{ + if (so->image_mapping.num_ibo == 0) + return; + + list_for_each_entry (struct ir3_block, block, &ir->block_list, node) { + list_for_each_entry (struct ir3_instruction, instr, &block->instr_list, node) { + instr->data = NULL; + } + } + + list_for_each_entry (struct ir3_block, block, &ir->block_list, node) { + list_for_each_entry_safe (struct ir3_instruction, instr, &block->instr_list, node) { + struct ir3_register *reg; + + foreach_src(reg, instr) { + struct ir3_instruction *src = ssa(reg); + + if (!src) + continue; + + if (is_atomic(src->opc) && (src->flags & IR3_INSTR_G)) + reg->instr = get_atomic_dest_mov(src); + } + } + } + +} |