/* * Copyright © 2011 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 "main/macros.h" #include "intel_batchbuffer.h" #include "brw_context.h" #include "brw_state.h" #include "brw_defines.h" #include "common/gen_l3_config.h" /** * The following diagram shows how we partition the URB: * * 16kB or 32kB Rest of the URB space * __________-__________ _________________-_________________ * / \ / \ * +-------------------------------------------------------------+ * | VS/HS/DS/GS/FS Push | VS/HS/DS/GS URB | * | Constants | Entries | * +-------------------------------------------------------------+ * * Notably, push constants must be stored at the beginning of the URB * space, while entries can be stored anywhere. Ivybridge and Haswell * GT1/GT2 have a maximum constant buffer size of 16kB, while Haswell GT3 * doubles this (32kB). * * Ivybridge and Haswell GT1/GT2 allow push constants to be located (and * sized) in increments of 1kB. Haswell GT3 requires them to be located and * sized in increments of 2kB. * * Currently we split the constant buffer space evenly among whatever stages * are active. This is probably not ideal, but simple. * * Ivybridge GT1 and Haswell GT1 have 128kB of URB space. * Ivybridge GT2 and Haswell GT2 have 256kB of URB space. * Haswell GT3 has 512kB of URB space. * * See "Volume 2a: 3D Pipeline," section 1.8, "Volume 1b: Configurations", * and the documentation for 3DSTATE_PUSH_CONSTANT_ALLOC_xS. */ static void gen7_allocate_push_constants(struct brw_context *brw) { const struct gen_device_info *devinfo = &brw->screen->devinfo; /* BRW_NEW_GEOMETRY_PROGRAM */ bool gs_present = brw->programs[MESA_SHADER_GEOMETRY]; /* BRW_NEW_TESS_PROGRAMS */ bool tess_present = brw->programs[MESA_SHADER_TESS_EVAL]; unsigned avail_size = 16; unsigned multiplier = (devinfo->gen >= 8 || (devinfo->is_haswell && devinfo->gt == 3)) ? 2 : 1; int stages = 2 + gs_present + 2 * tess_present; /* Divide up the available space equally between stages. Because we * round down (using floor division), there may be some left over * space. We allocate that to the pixel shader stage. */ unsigned size_per_stage = avail_size / stages; unsigned vs_size = size_per_stage; unsigned hs_size = tess_present ? size_per_stage : 0; unsigned ds_size = tess_present ? size_per_stage : 0; unsigned gs_size = gs_present ? size_per_stage : 0; unsigned fs_size = avail_size - size_per_stage * (stages - 1); gen7_emit_push_constant_state(brw, multiplier * vs_size, multiplier * hs_size, multiplier * ds_size, multiplier * gs_size, multiplier * fs_size); /* From p115 of the Ivy Bridge PRM (3.2.1.4 3DSTATE_PUSH_CONSTANT_ALLOC_VS): * * Programming Restriction: * * The 3DSTATE_CONSTANT_VS must be reprogrammed prior to the next * 3DPRIMITIVE command after programming the * 3DSTATE_PUSH_CONSTANT_ALLOC_VS. * * Similar text exists for the other 3DSTATE_PUSH_CONSTANT_ALLOC_* * commands. */ brw->vs.base.push_constants_dirty = true; brw->tcs.base.push_constants_dirty = true; brw->tes.base.push_constants_dirty = true; brw->gs.base.push_constants_dirty = true; brw->wm.base.push_constants_dirty = true; } void gen7_emit_push_constant_state(struct brw_context *brw, unsigned vs_size, unsigned hs_size, unsigned ds_size, unsigned gs_size, unsigned fs_size) { const struct gen_device_info *devinfo = &brw->screen->devinfo; unsigned offset = 0; /* From the SKL PRM, Workarounds section (#878): * * Push constant buffer corruption possible. WA: Insert 2 zero-length * PushConst_PS before every intended PushConst_PS update, issue a * NULLPRIM after each of the zero len PC update to make sure CS commits * them. * * This workaround is attempting to solve a pixel shader push constant * synchronization issue. * * There's an unpublished WA that involves re-emitting * 3DSTATE_PUSH_CONSTANT_ALLOC_PS for every 500-ish 3DSTATE_CONSTANT_PS * packets. Since our counting methods may not be reliable due to * context-switching and pre-emption, we instead choose to approximate this * behavior by re-emitting the packet at the top of the batch. */ if (brw->ctx.NewDriverState == BRW_NEW_BATCH) { /* SKL GT2 and GLK 2x6 have reliably demonstrated this issue thus far. * We've also seen some intermittent failures from SKL GT4 and BXT in * the past. */ if (!devinfo->is_skylake && !devinfo->is_broxton && !devinfo->is_geminilake) return; } BEGIN_BATCH(10); OUT_BATCH(_3DSTATE_PUSH_CONSTANT_ALLOC_VS << 16 | (2 - 2)); OUT_BATCH(vs_size | offset << GEN7_PUSH_CONSTANT_BUFFER_OFFSET_SHIFT); offset += vs_size; OUT_BATCH(_3DSTATE_PUSH_CONSTANT_ALLOC_HS << 16 | (2 - 2)); OUT_BATCH(hs_size | offset << GEN7_PUSH_CONSTANT_BUFFER_OFFSET_SHIFT); offset += hs_size; OUT_BATCH(_3DSTATE_PUSH_CONSTANT_ALLOC_DS << 16 | (2 - 2)); OUT_BATCH(ds_size | offset << GEN7_PUSH_CONSTANT_BUFFER_OFFSET_SHIFT); offset += ds_size; OUT_BATCH(_3DSTATE_PUSH_CONSTANT_ALLOC_GS << 16 | (2 - 2)); OUT_BATCH(gs_size | offset << GEN7_PUSH_CONSTANT_BUFFER_OFFSET_SHIFT); offset += gs_size; OUT_BATCH(_3DSTATE_PUSH_CONSTANT_ALLOC_PS << 16 | (2 - 2)); OUT_BATCH(fs_size | offset << GEN7_PUSH_CONSTANT_BUFFER_OFFSET_SHIFT); ADVANCE_BATCH(); /* From p292 of the Ivy Bridge PRM (11.2.4 3DSTATE_PUSH_CONSTANT_ALLOC_PS): * * A PIPE_CONTROL command with the CS Stall bit set must be programmed * in the ring after this instruction. * * No such restriction exists for Haswell or Baytrail. */ if (devinfo->gen < 8 && !devinfo->is_haswell && !devinfo->is_baytrail) gen7_emit_cs_stall_flush(brw); } const struct brw_tracked_state gen7_push_constant_space = { .dirty = { .mesa = 0, .brw = BRW_NEW_CONTEXT | BRW_NEW_BATCH | /* Push constant workaround */ BRW_NEW_GEOMETRY_PROGRAM | BRW_NEW_TESS_PROGRAMS, }, .emit = gen7_allocate_push_constants, }; static void upload_urb(struct brw_context *brw) { /* BRW_NEW_VS_PROG_DATA */ const struct brw_vue_prog_data *vs_vue_prog_data = brw_vue_prog_data(brw->vs.base.prog_data); const unsigned vs_size = MAX2(vs_vue_prog_data->urb_entry_size, 1); /* BRW_NEW_GS_PROG_DATA */ const bool gs_present = brw->gs.base.prog_data; /* BRW_NEW_TES_PROG_DATA */ const bool tess_present = brw->tes.base.prog_data; gen7_upload_urb(brw, vs_size, gs_present, tess_present); } void gen7_upload_urb(struct brw_context *brw, unsigned vs_size, bool gs_present, bool tess_present) { const struct gen_device_info *devinfo = &brw->screen->devinfo; /* BRW_NEW_{VS,TCS,TES,GS}_PROG_DATA */ struct brw_vue_prog_data *prog_data[4] = { [MESA_SHADER_VERTEX] = brw_vue_prog_data(brw->vs.base.prog_data), [MESA_SHADER_TESS_CTRL] = tess_present ? brw_vue_prog_data(brw->tcs.base.prog_data) : NULL, [MESA_SHADER_TESS_EVAL] = tess_present ? brw_vue_prog_data(brw->tes.base.prog_data) : NULL, [MESA_SHADER_GEOMETRY] = gs_present ? brw_vue_prog_data(brw->gs.base.prog_data) : NULL, }; unsigned entry_size[4]; entry_size[MESA_SHADER_VERTEX] = vs_size; for (int i = MESA_SHADER_TESS_CTRL; i <= MESA_SHADER_GEOMETRY; i++) { entry_size[i] = prog_data[i] ? prog_data[i]->urb_entry_size : 1; } /* If we're just switching between programs with the same URB requirements, * skip the rest of the logic. */ if (brw->urb.vsize == entry_size[MESA_SHADER_VERTEX] && brw->urb.gs_present == gs_present && brw->urb.gsize == entry_size[MESA_SHADER_GEOMETRY] && brw->urb.tess_present == tess_present && brw->urb.hsize == entry_size[MESA_SHADER_TESS_CTRL] && brw->urb.dsize == entry_size[MESA_SHADER_TESS_EVAL]) { return; } brw->urb.vsize = entry_size[MESA_SHADER_VERTEX]; brw->urb.gs_present = gs_present; brw->urb.gsize = entry_size[MESA_SHADER_GEOMETRY]; brw->urb.tess_present = tess_present; brw->urb.hsize = entry_size[MESA_SHADER_TESS_CTRL]; brw->urb.dsize = entry_size[MESA_SHADER_TESS_EVAL]; unsigned entries[4]; unsigned start[4]; gen_get_urb_config(devinfo, brw->l3.config, tess_present, gs_present, entry_size, entries, start, NULL); if (devinfo->gen == 7 && !devinfo->is_haswell && !devinfo->is_baytrail) gen7_emit_vs_workaround_flush(brw); BEGIN_BATCH(8); for (int i = MESA_SHADER_VERTEX; i <= MESA_SHADER_GEOMETRY; i++) { assert(devinfo->gen != 10 || entry_size[i] % 3); OUT_BATCH((_3DSTATE_URB_VS + i) << 16 | (2 - 2)); OUT_BATCH(entries[i] | ((entry_size[i] - 1) << GEN7_URB_ENTRY_SIZE_SHIFT) | (start[i] << GEN7_URB_STARTING_ADDRESS_SHIFT)); } ADVANCE_BATCH(); } const struct brw_tracked_state gen7_urb = { .dirty = { .mesa = 0, .brw = BRW_NEW_BLORP | BRW_NEW_CONTEXT | BRW_NEW_URB_SIZE | BRW_NEW_GS_PROG_DATA | BRW_NEW_TCS_PROG_DATA | BRW_NEW_TES_PROG_DATA | BRW_NEW_VS_PROG_DATA, }, .emit = upload_urb, };