summaryrefslogtreecommitdiff
path: root/src/gallium/drivers/i965/brw_urb.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/gallium/drivers/i965/brw_urb.c')
-rw-r--r--src/gallium/drivers/i965/brw_urb.c263
1 files changed, 263 insertions, 0 deletions
diff --git a/src/gallium/drivers/i965/brw_urb.c b/src/gallium/drivers/i965/brw_urb.c
new file mode 100644
index 00000000000..907ec56c6ca
--- /dev/null
+++ b/src/gallium/drivers/i965/brw_urb.c
@@ -0,0 +1,263 @@
+/*
+ Copyright (C) Intel Corp. 2006. All Rights Reserved.
+ Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
+ develop this 3D driver.
+
+ 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 COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS 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:
+ * Keith Whitwell <keith@tungstengraphics.com>
+ */
+
+
+
+#include "brw_batchbuffer.h"
+#include "brw_context.h"
+#include "brw_state.h"
+#include "brw_defines.h"
+#include "brw_debug.h"
+
+#define VS 0
+#define GS 1
+#define CLP 2
+#define SF 3
+#define CS 4
+
+/** @file brw_urb.c
+ *
+ * Manages the division of the URB space between the various fixed-function
+ * units.
+ *
+ * See the Thread Initiation Management section of the GEN4 B-Spec, and
+ * the individual *_STATE structures for restrictions on numbers of
+ * entries and threads.
+ */
+
+/*
+ * Generally, a unit requires a min_nr_entries based on how many entries
+ * it produces before the downstream unit gets unblocked and can use and
+ * dereference some of its handles.
+ *
+ * The SF unit preallocates a PUE at the start of thread dispatch, and only
+ * uses that one. So it requires one entry per thread.
+ *
+ * For CLIP, the SF unit will hold the previous primitive while the
+ * next is getting assembled, meaning that linestrips require 3 CLIP VUEs
+ * (vertices) to ensure continued processing, trifans require 4, and tristrips
+ * require 5. There can be 1 or 2 threads, and each has the same requirement.
+ *
+ * GS has the same requirement as CLIP, but it never handles tristrips,
+ * so we can lower the minimum to 4 for the POLYGONs (trifans) it produces.
+ * We only run it single-threaded.
+ *
+ * For VS, the number of entries may be 8, 12, 16, or 32 (or 64 on G4X).
+ * Each thread processes 2 preallocated VUEs (vertices) at a time, and they
+ * get streamed down as soon as threads processing earlier vertices get
+ * theirs accepted.
+ *
+ * Each unit will take the number of URB entries we give it (based on the
+ * entry size calculated in brw_vs_emit.c for VUEs, brw_sf_emit.c for PUEs,
+ * and brw_curbe.c for the CURBEs) and decide its maximum number of
+ * threads it can support based on that. in brw_*_state.c.
+ *
+ * XXX: Are the min_entry_size numbers useful?
+ * XXX: Verify min_nr_entries, esp for VS.
+ * XXX: Verify SF min_entry_size.
+ */
+static const struct urb_limits {
+ GLuint min_nr_entries;
+ GLuint preferred_nr_entries;
+ GLuint min_entry_size;
+ GLuint max_entry_size;
+} limits[CS+1] = {
+ { 16, 32, 1, 5 }, /* vs */
+ { 4, 8, 1, 5 }, /* gs */
+ { 5, 10, 1, 5 }, /* clp */
+ { 1, 8, 1, 12 }, /* sf */
+ { 1, 4, 1, 32 } /* cs */
+};
+
+
+static GLboolean check_urb_layout( struct brw_context *brw )
+{
+ brw->urb.vs_start = 0;
+ brw->urb.gs_start = brw->urb.nr_vs_entries * brw->urb.vsize;
+ brw->urb.clip_start = brw->urb.gs_start + brw->urb.nr_gs_entries * brw->urb.vsize;
+ brw->urb.sf_start = brw->urb.clip_start + brw->urb.nr_clip_entries * brw->urb.vsize;
+ brw->urb.cs_start = brw->urb.sf_start + brw->urb.nr_sf_entries * brw->urb.sfsize;
+
+ return brw->urb.cs_start + brw->urb.nr_cs_entries * brw->urb.csize <= URB_SIZES(brw);
+}
+
+/* Most minimal update, forces re-emit of URB fence packet after GS
+ * unit turned on/off.
+ */
+static int recalculate_urb_fence( struct brw_context *brw )
+{
+ GLuint csize = brw->curbe.total_size;
+ GLuint vsize = brw->vs.prog_data->urb_entry_size;
+ GLuint sfsize = brw->sf.prog_data->urb_entry_size;
+
+ if (csize < limits[CS].min_entry_size)
+ csize = limits[CS].min_entry_size;
+
+ if (vsize < limits[VS].min_entry_size)
+ vsize = limits[VS].min_entry_size;
+
+ if (sfsize < limits[SF].min_entry_size)
+ sfsize = limits[SF].min_entry_size;
+
+ if (brw->urb.vsize < vsize ||
+ brw->urb.sfsize < sfsize ||
+ brw->urb.csize < csize ||
+ (brw->urb.constrained && (brw->urb.vsize > vsize ||
+ brw->urb.sfsize > sfsize ||
+ brw->urb.csize > csize))) {
+
+
+ brw->urb.csize = csize;
+ brw->urb.sfsize = sfsize;
+ brw->urb.vsize = vsize;
+
+ brw->urb.nr_vs_entries = limits[VS].preferred_nr_entries;
+ brw->urb.nr_gs_entries = limits[GS].preferred_nr_entries;
+ brw->urb.nr_clip_entries = limits[CLP].preferred_nr_entries;
+ brw->urb.nr_sf_entries = limits[SF].preferred_nr_entries;
+ brw->urb.nr_cs_entries = limits[CS].preferred_nr_entries;
+
+ brw->urb.constrained = 0;
+
+ if (BRW_IS_IGDNG(brw)) {
+ brw->urb.nr_vs_entries = 128;
+ brw->urb.nr_sf_entries = 48;
+ if (check_urb_layout(brw)) {
+ goto done;
+ } else {
+ brw->urb.constrained = 1;
+ brw->urb.nr_vs_entries = limits[VS].preferred_nr_entries;
+ brw->urb.nr_sf_entries = limits[SF].preferred_nr_entries;
+ }
+ } else if (BRW_IS_G4X(brw)) {
+ brw->urb.nr_vs_entries = 64;
+ if (check_urb_layout(brw)) {
+ goto done;
+ } else {
+ brw->urb.constrained = 1;
+ brw->urb.nr_vs_entries = limits[VS].preferred_nr_entries;
+ }
+ }
+
+ if (BRW_DEBUG & DEBUG_MIN_URB) {
+ brw->urb.nr_vs_entries = limits[VS].min_nr_entries;
+ brw->urb.nr_gs_entries = limits[GS].min_nr_entries;
+ brw->urb.nr_clip_entries = limits[CLP].min_nr_entries;
+ brw->urb.nr_sf_entries = limits[SF].min_nr_entries;
+ brw->urb.nr_cs_entries = limits[CS].min_nr_entries;
+ brw->urb.constrained = 1;
+ }
+
+ if (!check_urb_layout(brw)) {
+ brw->urb.nr_vs_entries = limits[VS].min_nr_entries;
+ brw->urb.nr_gs_entries = limits[GS].min_nr_entries;
+ brw->urb.nr_clip_entries = limits[CLP].min_nr_entries;
+ brw->urb.nr_sf_entries = limits[SF].min_nr_entries;
+ brw->urb.nr_cs_entries = limits[CS].min_nr_entries;
+
+ /* Mark us as operating with constrained nr_entries, so that next
+ * time we recalculate we'll resize the fences in the hope of
+ * escaping constrained mode and getting back to normal performance.
+ */
+ brw->urb.constrained = 1;
+
+ if (!check_urb_layout(brw)) {
+ /* This is impossible, given the maximal sizes of urb
+ * entries and the values for minimum nr of entries
+ * provided above.
+ */
+ debug_printf("couldn't calculate URB layout!\n");
+ exit(1);
+ }
+
+ if (BRW_DEBUG & (DEBUG_URB|DEBUG_FALLBACKS))
+ debug_printf("URB CONSTRAINED\n");
+ }
+
+done:
+ if (BRW_DEBUG & DEBUG_URB)
+ debug_printf("URB fence: %d ..VS.. %d ..GS.. %d ..CLP.. %d ..SF.. %d ..CS.. %d\n",
+ brw->urb.vs_start,
+ brw->urb.gs_start,
+ brw->urb.clip_start,
+ brw->urb.sf_start,
+ brw->urb.cs_start,
+ URB_SIZES(brw));
+
+ brw->state.dirty.brw |= BRW_NEW_URB_FENCE;
+ }
+
+ return 0;
+}
+
+
+const struct brw_tracked_state brw_recalculate_urb_fence = {
+ .dirty = {
+ .mesa = 0,
+ .brw = BRW_NEW_CURBE_OFFSETS,
+ .cache = (CACHE_NEW_VS_PROG |
+ CACHE_NEW_SF_PROG)
+ },
+ .prepare = recalculate_urb_fence
+};
+
+
+
+
+
+int brw_upload_urb_fence(struct brw_context *brw)
+{
+ struct brw_urb_fence uf;
+ memset(&uf, 0, sizeof(uf));
+
+ uf.header.opcode = CMD_URB_FENCE;
+ uf.header.length = sizeof(uf)/4-2;
+ uf.header.vs_realloc = 1;
+ uf.header.gs_realloc = 1;
+ uf.header.clp_realloc = 1;
+ uf.header.sf_realloc = 1;
+ uf.header.vfe_realloc = 1;
+ uf.header.cs_realloc = 1;
+
+ /* The ordering below is correct, not the layout in the
+ * instruction.
+ *
+ * There are 256/384 urb reg pairs in total.
+ */
+ uf.bits0.vs_fence = brw->urb.gs_start;
+ uf.bits0.gs_fence = brw->urb.clip_start;
+ uf.bits0.clp_fence = brw->urb.sf_start;
+ uf.bits1.sf_fence = brw->urb.cs_start;
+ uf.bits1.cs_fence = URB_SIZES(brw);
+
+ BRW_BATCH_STRUCT(brw, &uf);
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-24 15:03:08 +0000