+void
+brw_enable_obj_preemption(struct brw_context *brw, bool enable)
+{
+ ASSERTED const struct gen_device_info *devinfo = &brw->screen->devinfo;
+ assert(devinfo->gen >= 9);
+
+ if (enable == brw->object_preemption)
+ return;
+
+ /* A fixed function pipe flush is required before modifying this field */
+ brw_emit_end_of_pipe_sync(brw, PIPE_CONTROL_RENDER_TARGET_FLUSH);
+
+ bool replay_mode = enable ?
+ GEN9_REPLAY_MODE_MIDOBJECT : GEN9_REPLAY_MODE_MIDBUFFER;
+
+ /* enable object level preemption */
+ brw_load_register_imm32(brw, CS_CHICKEN1,
+ replay_mode | GEN9_REPLAY_MODE_MASK);
+
+ brw->object_preemption = enable;
+}
+
+static void
+brw_upload_gen11_slice_hashing_state(struct brw_context *brw)
+{
+ const struct gen_device_info *devinfo = &brw->screen->devinfo;
+ int subslices_delta =
+ devinfo->ppipe_subslices[0] - devinfo->ppipe_subslices[1];
+ if (subslices_delta == 0)
+ return;
+
+ unsigned size = GEN11_SLICE_HASH_TABLE_length * 4;
+ uint32_t hash_address;
+
+ uint32_t *map = brw_state_batch(brw, size, 64, &hash_address);
+
+ unsigned idx = 0;
+
+ unsigned sl_small = 0;
+ unsigned sl_big = 1;
+ if (subslices_delta > 0) {
+ sl_small = 1;
+ sl_big = 0;
+ }
+
+ /**
+ * Create a 16x16 slice hashing table like the following one:
+ *
+ * [ 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1 ]
+ * [ 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1 ]
+ * [ 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0 ]
+ * [ 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1 ]
+ * [ 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1 ]
+ * [ 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0 ]
+ * [ 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1 ]
+ * [ 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1 ]
+ * [ 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0 ]
+ * [ 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1 ]
+ * [ 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1 ]
+ * [ 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0 ]
+ * [ 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1 ]
+ * [ 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1 ]
+ * [ 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0 ]
+ * [ 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1 ]
+ *
+ * The table above is used when the pixel pipe 0 has less subslices than
+ * pixel pipe 1. When pixel pipe 0 has more subslices, then a similar table
+ * with 0's and 1's inverted is used.
+ */
+ for (int i = 0; i < GEN11_SLICE_HASH_TABLE_length; i++) {
+ uint32_t dw = 0;
+
+ for (int j = 0; j < 8; j++) {
+ unsigned slice = idx++ % 3 ? sl_big : sl_small;
+ dw |= slice << (j * 4);
+ }
+ map[i] = dw;
+ }
+
+ BEGIN_BATCH(2);
+ OUT_BATCH(_3DSTATE_SLICE_TABLE_STATE_POINTERS << 16 | (2 - 2));
+ OUT_RELOC(brw->batch.state.bo, 0, hash_address | 1);
+ ADVANCE_BATCH();
+
+ /* From gen10/gen11 workaround table in h/w specs:
+ *
+ * "On 3DSTATE_3D_MODE, driver must always program bits 31:16 of DW1
+ * a value of 0xFFFF"
+ *
+ * This means that whenever we update a field with this instruction, we need
+ * to update all the others.
+ *
+ * Since this is the first time we emit this
+ * instruction, we are only setting the fSLICE_HASHING_TABLE_ENABLE flag,
+ * and leaving everything else at their default state (0).
+ */
+ BEGIN_BATCH(2);
+ OUT_BATCH(_3DSTATE_3D_MODE << 16 | (2 - 2));
+ OUT_BATCH(0xffff | SLICE_HASHING_TABLE_ENABLE);
+ ADVANCE_BATCH();
+}
+