/************************************************************************** * * Copyright 2006 Tungsten Graphics, Inc., Cedar Park, Texas. * All Rights Reserved. * * 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, sub license, 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 NON-INFRINGEMENT. * IN NO EVENT SHALL TUNGSTEN GRAPHICS 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. * **************************************************************************/ #include "intel_batchbuffer.h" #include "intel_buffer_objects.h" #include "intel_reg.h" #include "intel_bufmgr.h" #include "intel_buffers.h" #include "brw_context.h" static void intel_batchbuffer_reset(struct brw_context *brw); struct cached_batch_item { struct cached_batch_item *next; uint16_t header; uint16_t size; }; void intel_batchbuffer_clear_cache(struct brw_context *brw) { struct cached_batch_item *item = brw->batch.cached_items; while (item) { struct cached_batch_item *next = item->next; free(item); item = next; } brw->batch.cached_items = NULL; } void intel_batchbuffer_init(struct brw_context *brw) { intel_batchbuffer_reset(brw); if (brw->gen >= 6) { /* We can't just use brw_state_batch to get a chunk of space for * the gen6 workaround because it involves actually writing to * the buffer, and the kernel doesn't let us write to the batch. */ brw->batch.workaround_bo = drm_intel_bo_alloc(brw->bufmgr, "pipe_control workaround", 4096, 4096); } brw->batch.need_workaround_flush = true; if (!brw->has_llc) { brw->batch.cpu_map = malloc(BATCH_SZ); brw->batch.map = brw->batch.cpu_map; } } static void intel_batchbuffer_reset(struct brw_context *brw) { if (brw->batch.last_bo != NULL) { drm_intel_bo_unreference(brw->batch.last_bo); brw->batch.last_bo = NULL; } brw->batch.last_bo = brw->batch.bo; intel_batchbuffer_clear_cache(brw); brw->batch.bo = drm_intel_bo_alloc(brw->bufmgr, "batchbuffer", BATCH_SZ, 4096); if (brw->has_llc) { drm_intel_bo_map(brw->batch.bo, true); brw->batch.map = brw->batch.bo->virtual; } brw->batch.reserved_space = BATCH_RESERVED; brw->batch.state_batch_offset = brw->batch.bo->size; brw->batch.used = 0; brw->batch.needs_sol_reset = false; } void intel_batchbuffer_save_state(struct brw_context *brw) { brw->batch.saved.used = brw->batch.used; brw->batch.saved.reloc_count = drm_intel_gem_bo_get_reloc_count(brw->batch.bo); } void intel_batchbuffer_reset_to_saved(struct brw_context *brw) { drm_intel_gem_bo_clear_relocs(brw->batch.bo, brw->batch.saved.reloc_count); brw->batch.used = brw->batch.saved.used; /* Cached batch state is dead, since we just cleared some unknown part of the * batchbuffer. Assume that the caller resets any other state necessary. */ intel_batchbuffer_clear_cache(brw); } void intel_batchbuffer_free(struct brw_context *brw) { free(brw->batch.cpu_map); drm_intel_bo_unreference(brw->batch.last_bo); drm_intel_bo_unreference(brw->batch.bo); drm_intel_bo_unreference(brw->batch.workaround_bo); intel_batchbuffer_clear_cache(brw); } static void do_batch_dump(struct brw_context *brw) { struct drm_intel_decode *decode; struct intel_batchbuffer *batch = &brw->batch; int ret; decode = drm_intel_decode_context_alloc(brw->intelScreen->deviceID); if (!decode) return; ret = drm_intel_bo_map(batch->bo, false); if (ret == 0) { drm_intel_decode_set_batch_pointer(decode, batch->bo->virtual, batch->bo->offset, batch->used); } else { fprintf(stderr, "WARNING: failed to map batchbuffer (%s), " "dumping uploaded data instead.\n", strerror(ret)); drm_intel_decode_set_batch_pointer(decode, batch->map, batch->bo->offset, batch->used); } drm_intel_decode(decode); drm_intel_decode_context_free(decode); if (ret == 0) { drm_intel_bo_unmap(batch->bo); brw_debug_batch(brw); } } /** * Called when starting a new batch buffer. */ static void brw_new_batch(struct brw_context *brw) { /* If the kernel supports hardware contexts, then most hardware state is * preserved between batches; we only need to re-emit state that is required * to be in every batch. Otherwise we need to re-emit all the state that * would otherwise be stored in the context (which for all intents and * purposes means everything). */ if (brw->hw_ctx == NULL) brw->state.dirty.brw |= BRW_NEW_CONTEXT; brw->state.dirty.brw |= BRW_NEW_BATCH; /* Assume that the last command before the start of our batch was a * primitive, for safety. */ brw->batch.need_workaround_flush = true; brw->state_batch_count = 0; brw->ib.type = -1; /* Mark that the current program cache BO has been used by the GPU. * It will be reallocated if we need to put new programs in for the * next batch. */ brw->cache.bo_used_by_gpu = true; /* We need to periodically reap the shader time results, because rollover * happens every few seconds. We also want to see results every once in a * while, because many programs won't cleanly destroy our context, so the * end-of-run printout may not happen. */ if (INTEL_DEBUG & DEBUG_SHADER_TIME) brw_collect_and_report_shader_time(brw); } /** * Called from intel_batchbuffer_flush before emitting MI_BATCHBUFFER_END and * sending it off. * * This function can emit state (say, to preserve registers that aren't saved * between batches). All of this state MUST fit in the reserved space at the * end of the batchbuffer. If you add more GPU state, increase the reserved * space by updating the BATCH_RESERVED macro. */ static void brw_finish_batch(struct brw_context *brw) { brw_emit_query_end(brw); if (brw->curbe.curbe_bo) { drm_intel_gem_bo_unmap_gtt(brw->curbe.curbe_bo); drm_intel_bo_unreference(brw->curbe.curbe_bo); brw->curbe.curbe_bo = NULL; } } /* TODO: Push this whole function into bufmgr. */ static int do_flush_locked(struct brw_context *brw) { struct intel_batchbuffer *batch = &brw->batch; int ret = 0; if (brw->has_llc) { drm_intel_bo_unmap(batch->bo); } else { ret = drm_intel_bo_subdata(batch->bo, 0, 4*batch->used, batch->map); if (ret == 0 && batch->state_batch_offset != batch->bo->size) { ret = drm_intel_bo_subdata(batch->bo, batch->state_batch_offset, batch->bo->size - batch->state_batch_offset, (char *)batch->map + batch->state_batch_offset); } } if (!brw->intelScreen->no_hw) { int flags; if (brw->gen < 6 || !batch->is_blit) { flags = I915_EXEC_RENDER; } else { flags = I915_EXEC_BLT; } if (batch->needs_sol_reset) flags |= I915_EXEC_GEN7_SOL_RESET; if (ret == 0) { if (unlikely(INTEL_DEBUG & DEBUG_AUB)) brw_annotate_aub(brw); if (brw->hw_ctx == NULL || batch->is_blit) { ret = drm_intel_bo_mrb_exec(batch->bo, 4 * batch->used, NULL, 0, 0, flags); } else { ret = drm_intel_gem_bo_context_exec(batch->bo, brw->hw_ctx, 4 * batch->used, flags); } } } if (unlikely(INTEL_DEBUG & DEBUG_BATCH)) do_batch_dump(brw); if (ret != 0) { fprintf(stderr, "intel_do_flush_locked failed: %s\n", strerror(-ret)); exit(1); } brw_new_batch(brw); return ret; } int _intel_batchbuffer_flush(struct brw_context *brw, const char *file, int line) { int ret; if (brw->batch.used == 0) return 0; if (brw->first_post_swapbuffers_batch == NULL) { brw->first_post_swapbuffers_batch = brw->batch.bo; drm_intel_bo_reference(brw->first_post_swapbuffers_batch); } if (unlikely(INTEL_DEBUG & DEBUG_BATCH)) { int bytes_for_commands = 4 * brw->batch.used; int bytes_for_state = brw->batch.bo->size - brw->batch.state_batch_offset; int total_bytes = bytes_for_commands + bytes_for_state; fprintf(stderr, "%s:%d: Batchbuffer flush with %4db (pkt) + " "%4db (state) = %4db (%0.1f%%)\n", file, line, bytes_for_commands, bytes_for_state, total_bytes, 100.0f * total_bytes / BATCH_SZ); } brw->batch.reserved_space = 0; brw_finish_batch(brw); /* Mark the end of the buffer. */ intel_batchbuffer_emit_dword(brw, MI_BATCH_BUFFER_END); if (brw->batch.used & 1) { /* Round batchbuffer usage to 2 DWORDs. */ intel_batchbuffer_emit_dword(brw, MI_NOOP); } intel_upload_finish(brw); /* Check that we didn't just wrap our batchbuffer at a bad time. */ assert(!brw->no_batch_wrap); ret = do_flush_locked(brw); if (unlikely(INTEL_DEBUG & DEBUG_SYNC)) { fprintf(stderr, "waiting for idle\n"); drm_intel_bo_wait_rendering(brw->batch.bo); } /* Reset the buffer: */ intel_batchbuffer_reset(brw); return ret; } /* This is the only way buffers get added to the validate list. */ bool intel_batchbuffer_emit_reloc(struct brw_context *brw, drm_intel_bo *buffer, uint32_t read_domains, uint32_t write_domain, uint32_t delta) { int ret; ret = drm_intel_bo_emit_reloc(brw->batch.bo, 4*brw->batch.used, buffer, delta, read_domains, write_domain); assert(ret == 0); (void)ret; /* * Using the old buffer offset, write in what the right data would be, in case * the buffer doesn't move and we can short-circuit the relocation processing * in the kernel */ intel_batchbuffer_emit_dword(brw, buffer->offset + delta); return true; } bool intel_batchbuffer_emit_reloc_fenced(struct brw_context *brw, drm_intel_bo *buffer, uint32_t read_domains, uint32_t write_domain, uint32_t delta) { int ret; ret = drm_intel_bo_emit_reloc_fence(brw->batch.bo, 4*brw->batch.used, buffer, delta, read_domains, write_domain); assert(ret == 0); (void)ret; /* * Using the old buffer offset, write in what the right data would * be, in case the buffer doesn't move and we can short-circuit the * relocation processing in the kernel */ intel_batchbuffer_emit_dword(brw, buffer->offset + delta); return true; } void intel_batchbuffer_data(struct brw_context *brw, const void *data, GLuint bytes, bool is_blit) { assert((bytes & 3) == 0); intel_batchbuffer_require_space(brw, bytes, is_blit); __memcpy(brw->batch.map + brw->batch.used, data, bytes); brw->batch.used += bytes >> 2; } void intel_batchbuffer_cached_advance(struct brw_context *brw) { struct cached_batch_item **prev = &brw->batch.cached_items, *item; uint32_t sz = (brw->batch.used - brw->batch.emit) * sizeof(uint32_t); uint32_t *start = brw->batch.map + brw->batch.emit; uint16_t op = *start >> 16; while (*prev) { uint32_t *old; item = *prev; old = brw->batch.map + item->header; if (op == *old >> 16) { if (item->size == sz && memcmp(old, start, sz) == 0) { if (prev != &brw->batch.cached_items) { *prev = item->next; item->next = brw->batch.cached_items; brw->batch.cached_items = item; } brw->batch.used = brw->batch.emit; return; } goto emit; } prev = &item->next; } item = malloc(sizeof(struct cached_batch_item)); if (item == NULL) return; item->next = brw->batch.cached_items; brw->batch.cached_items = item; emit: item->size = sz; item->header = brw->batch.emit; } /** * Restriction [DevSNB, DevIVB]: * * Prior to changing Depth/Stencil Buffer state (i.e. any combination of * 3DSTATE_DEPTH_BUFFER, 3DSTATE_CLEAR_PARAMS, 3DSTATE_STENCIL_BUFFER, * 3DSTATE_HIER_DEPTH_BUFFER) SW must first issue a pipelined depth stall * (PIPE_CONTROL with Depth Stall bit set), followed by a pipelined depth * cache flush (PIPE_CONTROL with Depth Flush Bit set), followed by * another pipelined depth stall (PIPE_CONTROL with Depth Stall bit set), * unless SW can otherwise guarantee that the pipeline from WM onwards is * already flushed (e.g., via a preceding MI_FLUSH). */ void intel_emit_depth_stall_flushes(struct brw_context *brw) { assert(brw->gen >= 6 && brw->gen <= 7); BEGIN_BATCH(4); OUT_BATCH(_3DSTATE_PIPE_CONTROL | (4 - 2)); OUT_BATCH(PIPE_CONTROL_DEPTH_STALL); OUT_BATCH(0); /* address */ OUT_BATCH(0); /* write data */ ADVANCE_BATCH() BEGIN_BATCH(4); OUT_BATCH(_3DSTATE_PIPE_CONTROL | (4 - 2)); OUT_BATCH(PIPE_CONTROL_DEPTH_CACHE_FLUSH); OUT_BATCH(0); /* address */ OUT_BATCH(0); /* write data */ ADVANCE_BATCH(); BEGIN_BATCH(4); OUT_BATCH(_3DSTATE_PIPE_CONTROL | (4 - 2)); OUT_BATCH(PIPE_CONTROL_DEPTH_STALL); OUT_BATCH(0); /* address */ OUT_BATCH(0); /* write data */ ADVANCE_BATCH(); } /** * From the Ivybridge PRM, Volume 2 Part 1, Section 3.2 (VS Stage Input): * "A PIPE_CONTROL with Post-Sync Operation set to 1h and a depth * stall needs to be sent just prior to any 3DSTATE_VS, 3DSTATE_URB_VS, * 3DSTATE_CONSTANT_VS, 3DSTATE_BINDING_TABLE_POINTER_VS, * 3DSTATE_SAMPLER_STATE_POINTER_VS command. Only one PIPE_CONTROL needs * to be sent before any combination of VS associated 3DSTATE." */ void gen7_emit_vs_workaround_flush(struct brw_context *brw) { assert(brw->gen == 7); BEGIN_BATCH(4); OUT_BATCH(_3DSTATE_PIPE_CONTROL | (4 - 2)); OUT_BATCH(PIPE_CONTROL_DEPTH_STALL | PIPE_CONTROL_WRITE_IMMEDIATE); OUT_RELOC(brw->batch.workaround_bo, I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION, 0); OUT_BATCH(0); /* write data */ ADVANCE_BATCH(); } /** * Emits a PIPE_CONTROL with a non-zero post-sync operation, for * implementing two workarounds on gen6. From section 1.4.7.1 * "PIPE_CONTROL" of the Sandy Bridge PRM volume 2 part 1: * * [DevSNB-C+{W/A}] Before any depth stall flush (including those * produced by non-pipelined state commands), software needs to first * send a PIPE_CONTROL with no bits set except Post-Sync Operation != * 0. * * [Dev-SNB{W/A}]: Before a PIPE_CONTROL with Write Cache Flush Enable * =1, a PIPE_CONTROL with any non-zero post-sync-op is required. * * And the workaround for these two requires this workaround first: * * [Dev-SNB{W/A}]: Pipe-control with CS-stall bit set must be sent * BEFORE the pipe-control with a post-sync op and no write-cache * flushes. * * And this last workaround is tricky because of the requirements on * that bit. From section 1.4.7.2.3 "Stall" of the Sandy Bridge PRM * volume 2 part 1: * * "1 of the following must also be set: * - Render Target Cache Flush Enable ([12] of DW1) * - Depth Cache Flush Enable ([0] of DW1) * - Stall at Pixel Scoreboard ([1] of DW1) * - Depth Stall ([13] of DW1) * - Post-Sync Operation ([13] of DW1) * - Notify Enable ([8] of DW1)" * * The cache flushes require the workaround flush that triggered this * one, so we can't use it. Depth stall would trigger the same. * Post-sync nonzero is what triggered this second workaround, so we * can't use that one either. Notify enable is IRQs, which aren't * really our business. That leaves only stall at scoreboard. */ void intel_emit_post_sync_nonzero_flush(struct brw_context *brw) { if (!brw->batch.need_workaround_flush) return; BEGIN_BATCH(4); OUT_BATCH(_3DSTATE_PIPE_CONTROL | (4 - 2)); OUT_BATCH(PIPE_CONTROL_CS_STALL | PIPE_CONTROL_STALL_AT_SCOREBOARD); OUT_BATCH(0); /* address */ OUT_BATCH(0); /* write data */ ADVANCE_BATCH(); BEGIN_BATCH(4); OUT_BATCH(_3DSTATE_PIPE_CONTROL | (4 - 2)); OUT_BATCH(PIPE_CONTROL_WRITE_IMMEDIATE); OUT_RELOC(brw->batch.workaround_bo, I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION, 0); OUT_BATCH(0); /* write data */ ADVANCE_BATCH(); brw->batch.need_workaround_flush = false; } /* Emit a pipelined flush to either flush render and texture cache for * reading from a FBO-drawn texture, or flush so that frontbuffer * render appears on the screen in DRI1. * * This is also used for the always_flush_cache driconf debug option. */ void intel_batchbuffer_emit_mi_flush(struct brw_context *brw) { if (brw->gen >= 6) { if (brw->batch.is_blit) { BEGIN_BATCH_BLT(4); OUT_BATCH(MI_FLUSH_DW); OUT_BATCH(0); OUT_BATCH(0); OUT_BATCH(0); ADVANCE_BATCH(); } else { if (brw->gen == 6) { /* Hardware workaround: SNB B-Spec says: * * [Dev-SNB{W/A}]: Before a PIPE_CONTROL with Write Cache * Flush Enable =1, a PIPE_CONTROL with any non-zero * post-sync-op is required. */ intel_emit_post_sync_nonzero_flush(brw); } BEGIN_BATCH(4); OUT_BATCH(_3DSTATE_PIPE_CONTROL | (4 - 2)); OUT_BATCH(PIPE_CONTROL_INSTRUCTION_FLUSH | PIPE_CONTROL_WRITE_FLUSH | PIPE_CONTROL_DEPTH_CACHE_FLUSH | PIPE_CONTROL_VF_CACHE_INVALIDATE | PIPE_CONTROL_TC_FLUSH | PIPE_CONTROL_NO_WRITE | PIPE_CONTROL_CS_STALL); OUT_BATCH(0); /* write address */ OUT_BATCH(0); /* write data */ ADVANCE_BATCH(); } } else { BEGIN_BATCH(4); OUT_BATCH(_3DSTATE_PIPE_CONTROL | (4 - 2) | PIPE_CONTROL_WRITE_FLUSH | PIPE_CONTROL_NO_WRITE); OUT_BATCH(0); /* write address */ OUT_BATCH(0); /* write data */ OUT_BATCH(0); /* write data */ ADVANCE_BATCH(); } }