| /* |
| * Copyright © 2009 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. |
| * |
| * Authors: |
| * Eric Anholt <eric@anholt.net> |
| * |
| */ |
| |
| #include "main/macros.h" |
| #include "intel_batchbuffer.h" |
| #include "brw_context.h" |
| #include "brw_state.h" |
| #include "brw_defines.h" |
| |
| /** |
| * When the GS is not in use, we assign the entire URB space to the VS. When |
| * the GS is in use, we split the URB space evenly between the VS and the GS. |
| * This is not ideal, but it's simple. |
| * |
| * URB size / 2 URB size / 2 |
| * _____________-______________ _____________-______________ |
| * / \ / \ |
| * +-------------------------------------------------------------+ |
| * | Vertex Shader Entries | Geometry Shader Entries | |
| * +-------------------------------------------------------------+ |
| * |
| * Sandybridge GT1 has 32kB of URB space, while GT2 has 64kB. |
| * (See the Sandybridge PRM, Volume 2, Part 1, Section 1.4.7: 3DSTATE_URB.) |
| */ |
| void |
| gen6_upload_urb(struct brw_context *brw, unsigned vs_size, |
| bool gs_present, unsigned gs_size) |
| { |
| int nr_vs_entries, nr_gs_entries; |
| int total_urb_size = brw->urb.size * 1024; /* in bytes */ |
| const struct gen_device_info *devinfo = &brw->screen->devinfo; |
| |
| /* Calculate how many entries fit in each stage's section of the URB */ |
| if (gs_present) { |
| nr_vs_entries = (total_urb_size/2) / (vs_size * 128); |
| nr_gs_entries = (total_urb_size/2) / (gs_size * 128); |
| } else { |
| nr_vs_entries = total_urb_size / (vs_size * 128); |
| nr_gs_entries = 0; |
| } |
| |
| /* Then clamp to the maximum allowed by the hardware */ |
| if (nr_vs_entries > devinfo->urb.max_entries[MESA_SHADER_VERTEX]) |
| nr_vs_entries = devinfo->urb.max_entries[MESA_SHADER_VERTEX]; |
| |
| if (nr_gs_entries > devinfo->urb.max_entries[MESA_SHADER_GEOMETRY]) |
| nr_gs_entries = devinfo->urb.max_entries[MESA_SHADER_GEOMETRY]; |
| |
| /* Finally, both must be a multiple of 4 (see 3DSTATE_URB in the PRM). */ |
| brw->urb.nr_vs_entries = ROUND_DOWN_TO(nr_vs_entries, 4); |
| brw->urb.nr_gs_entries = ROUND_DOWN_TO(nr_gs_entries, 4); |
| |
| assert(brw->urb.nr_vs_entries >= |
| devinfo->urb.min_entries[MESA_SHADER_VERTEX]); |
| assert(brw->urb.nr_vs_entries % 4 == 0); |
| assert(brw->urb.nr_gs_entries % 4 == 0); |
| assert(vs_size <= 5); |
| assert(gs_size <= 5); |
| |
| BEGIN_BATCH(3); |
| OUT_BATCH(_3DSTATE_URB << 16 | (3 - 2)); |
| OUT_BATCH(((vs_size - 1) << GEN6_URB_VS_SIZE_SHIFT) | |
| ((brw->urb.nr_vs_entries) << GEN6_URB_VS_ENTRIES_SHIFT)); |
| OUT_BATCH(((gs_size - 1) << GEN6_URB_GS_SIZE_SHIFT) | |
| ((brw->urb.nr_gs_entries) << GEN6_URB_GS_ENTRIES_SHIFT)); |
| ADVANCE_BATCH(); |
| |
| /* From the PRM Volume 2 part 1, section 1.4.7: |
| * |
| * Because of a urb corruption caused by allocating a previous gsunit’s |
| * urb entry to vsunit software is required to send a "GS NULL |
| * Fence"(Send URB fence with VS URB size == 1 and GS URB size == 0) plus |
| * a dummy DRAW call before any case where VS will be taking over GS URB |
| * space. |
| * |
| * It is not clear exactly what this means ("URB fence" is a command that |
| * doesn't exist on Gen6). So for now we just do a full pipeline flush as |
| * a workaround. |
| */ |
| if (brw->urb.gs_present && !gs_present) |
| brw_emit_mi_flush(brw); |
| brw->urb.gs_present = gs_present; |
| } |
| |
| 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_GEOMETRY_PROGRAM, BRW_NEW_GS_PROG_DATA */ |
| const bool gs_present = brw->ff_gs.prog_active || brw->geometry_program; |
| |
| /* Whe using GS to do transform feedback only we use the same VUE layout for |
| * VS outputs and GS outputs (as it's what the SF and Clipper expect), so we |
| * can simply make the GS URB entry size the same as for the VS. This may |
| * technically be too large in cases where we have few vertex attributes and |
| * a lot of varyings, since the VS size is determined by the larger of the |
| * two. For now, it's safe. |
| * |
| * For user-provided GS the assumption above does not hold since the GS |
| * outputs can be different from the VS outputs. |
| */ |
| unsigned gs_size = vs_size; |
| if (brw->geometry_program) { |
| const struct brw_vue_prog_data *gs_vue_prog_data = |
| brw_vue_prog_data(brw->gs.base.prog_data); |
| gs_size = gs_vue_prog_data->urb_entry_size; |
| assert(gs_size >= 1); |
| } |
| |
| gen6_upload_urb(brw, vs_size, gs_present, gs_size); |
| } |
| |
| const struct brw_tracked_state gen6_urb = { |
| .dirty = { |
| .mesa = 0, |
| .brw = BRW_NEW_BLORP | |
| BRW_NEW_CONTEXT | |
| BRW_NEW_FF_GS_PROG_DATA | |
| BRW_NEW_GEOMETRY_PROGRAM | |
| BRW_NEW_GS_PROG_DATA | |
| BRW_NEW_VS_PROG_DATA, |
| }, |
| .emit = upload_urb, |
| }; |
