Example #1
0
static struct pipe_context *r600_create_context(struct pipe_screen *screen, void *priv)
{
	struct r600_context *rctx = CALLOC_STRUCT(r600_context);
	struct r600_screen* rscreen = (struct r600_screen *)screen;
	struct radeon_winsys *ws = rscreen->b.ws;

	if (rctx == NULL)
		return NULL;

	rctx->b.b.screen = screen;
	rctx->b.b.priv = priv;
	rctx->b.b.destroy = r600_destroy_context;

	if (!r600_common_context_init(&rctx->b, &rscreen->b))
		goto fail;

	rctx->screen = rscreen;
	rctx->keep_tiling_flags = rscreen->b.info.drm_minor >= 12;

	r600_init_blit_functions(rctx);

	if (rscreen->b.info.has_uvd) {
		rctx->b.b.create_video_codec = r600_uvd_create_decoder;
		rctx->b.b.create_video_buffer = r600_video_buffer_create;
	} else {
		rctx->b.b.create_video_codec = vl_create_decoder;
		rctx->b.b.create_video_buffer = vl_video_buffer_create;
	}

	r600_init_common_state_functions(rctx);

	switch (rctx->b.chip_class) {
	case R600:
	case R700:
		r600_init_state_functions(rctx);
		r600_init_atom_start_cs(rctx);
		rctx->custom_dsa_flush = r600_create_db_flush_dsa(rctx);
		rctx->custom_blend_resolve = rctx->b.chip_class == R700 ? r700_create_resolve_blend(rctx)
								      : r600_create_resolve_blend(rctx);
		rctx->custom_blend_decompress = r600_create_decompress_blend(rctx);
		rctx->has_vertex_cache = !(rctx->b.family == CHIP_RV610 ||
					   rctx->b.family == CHIP_RV620 ||
					   rctx->b.family == CHIP_RS780 ||
					   rctx->b.family == CHIP_RS880 ||
					   rctx->b.family == CHIP_RV710);
		break;
	case EVERGREEN:
	case CAYMAN:
		evergreen_init_state_functions(rctx);
		evergreen_init_atom_start_cs(rctx);
		evergreen_init_atom_start_compute_cs(rctx);
		rctx->custom_dsa_flush = evergreen_create_db_flush_dsa(rctx);
		rctx->custom_blend_resolve = evergreen_create_resolve_blend(rctx);
		rctx->custom_blend_decompress = evergreen_create_decompress_blend(rctx);
		rctx->custom_blend_fastclear = evergreen_create_fastclear_blend(rctx);
		rctx->has_vertex_cache = !(rctx->b.family == CHIP_CEDAR ||
					   rctx->b.family == CHIP_PALM ||
					   rctx->b.family == CHIP_SUMO ||
					   rctx->b.family == CHIP_SUMO2 ||
					   rctx->b.family == CHIP_CAICOS ||
					   rctx->b.family == CHIP_CAYMAN ||
					   rctx->b.family == CHIP_ARUBA);
		break;
	default:
		R600_ERR("Unsupported chip class %d.\n", rctx->b.chip_class);
		goto fail;
	}

	rctx->b.rings.gfx.cs = ws->cs_create(ws, RING_GFX,
					     r600_context_gfx_flush, rctx,
					     rscreen->b.trace_bo ?
						     rscreen->b.trace_bo->cs_buf : NULL);
	rctx->b.rings.gfx.flush = r600_context_gfx_flush;

	rctx->allocator_fetch_shader = u_suballocator_create(&rctx->b.b, 64 * 1024, 256,
							     0, PIPE_USAGE_DEFAULT, FALSE);
	if (!rctx->allocator_fetch_shader)
		goto fail;

	rctx->isa = calloc(1, sizeof(struct r600_isa));
	if (!rctx->isa || r600_isa_init(rctx, rctx->isa))
		goto fail;

	rctx->blitter = util_blitter_create(&rctx->b.b);
	if (rctx->blitter == NULL)
		goto fail;
	util_blitter_set_texture_multisample(rctx->blitter, rscreen->has_msaa);
	rctx->blitter->draw_rectangle = r600_draw_rectangle;

	r600_begin_new_cs(rctx);
	r600_query_init_backend_mask(&rctx->b); /* this emits commands and must be last */

	rctx->dummy_pixel_shader =
		util_make_fragment_cloneinput_shader(&rctx->b.b, 0,
						     TGSI_SEMANTIC_GENERIC,
						     TGSI_INTERPOLATE_CONSTANT);
	rctx->b.b.bind_fs_state(&rctx->b.b, rctx->dummy_pixel_shader);

	return &rctx->b.b;

fail:
	r600_destroy_context(&rctx->b.b);
	return NULL;
}
Example #2
0
static struct pipe_context *si_create_context(struct pipe_screen *screen, void *priv)
{
	struct si_context *sctx = CALLOC_STRUCT(si_context);
	struct si_screen* sscreen = (struct si_screen *)screen;
	struct radeon_winsys *ws = sscreen->b.ws;
	int shader, i;

	if (sctx == NULL)
		return NULL;

	sctx->b.b.screen = screen; /* this must be set first */
	sctx->b.b.priv = priv;
	sctx->b.b.destroy = si_destroy_context;
	sctx->screen = sscreen; /* Easy accessing of screen/winsys. */

	if (!r600_common_context_init(&sctx->b, &sscreen->b))
		goto fail;

	si_init_blit_functions(sctx);
	si_init_compute_functions(sctx);

	if (sscreen->b.info.has_uvd) {
		sctx->b.b.create_video_codec = si_uvd_create_decoder;
		sctx->b.b.create_video_buffer = si_video_buffer_create;
	} else {
		sctx->b.b.create_video_codec = vl_create_decoder;
		sctx->b.b.create_video_buffer = vl_video_buffer_create;
	}

	sctx->b.rings.gfx.cs = ws->cs_create(ws, RING_GFX, si_context_gfx_flush,
					     sctx, NULL);
	sctx->b.rings.gfx.flush = si_context_gfx_flush;

	si_init_all_descriptors(sctx);

	/* Initialize cache_flush. */
	sctx->cache_flush = si_atom_cache_flush;
	sctx->atoms.s.cache_flush = &sctx->cache_flush;

	sctx->msaa_config = si_atom_msaa_config;
	sctx->atoms.s.msaa_config = &sctx->msaa_config;

	sctx->atoms.s.streamout_begin = &sctx->b.streamout.begin_atom;
	sctx->atoms.s.streamout_enable = &sctx->b.streamout.enable_atom;

	switch (sctx->b.chip_class) {
	case SI:
	case CIK:
		si_init_state_functions(sctx);
		si_init_config(sctx);
		break;
	default:
		R600_ERR("Unsupported chip class %d.\n", sctx->b.chip_class);
		goto fail;
	}

	sctx->blitter = util_blitter_create(&sctx->b.b);
	if (sctx->blitter == NULL)
		goto fail;
	sctx->blitter->draw_rectangle = r600_draw_rectangle;

	sctx->dummy_pixel_shader =
		util_make_fragment_cloneinput_shader(&sctx->b.b, 0,
						     TGSI_SEMANTIC_GENERIC,
						     TGSI_INTERPOLATE_CONSTANT);
	sctx->b.b.bind_fs_state(&sctx->b.b, sctx->dummy_pixel_shader);

	/* these must be last */
	si_begin_new_cs(sctx);
	r600_query_init_backend_mask(&sctx->b); /* this emits commands and must be last */

	/* CIK cannot unbind a constant buffer (S_BUFFER_LOAD is buggy
	 * with a NULL buffer). We need to use a dummy buffer instead. */
	if (sctx->b.chip_class == CIK) {
		sctx->null_const_buf.buffer = pipe_buffer_create(screen, PIPE_BIND_CONSTANT_BUFFER,
								 PIPE_USAGE_DEFAULT, 16);
		sctx->null_const_buf.buffer_size = sctx->null_const_buf.buffer->width0;

		for (shader = 0; shader < SI_NUM_SHADERS; shader++) {
			for (i = 0; i < SI_NUM_CONST_BUFFERS; i++) {
				sctx->b.b.set_constant_buffer(&sctx->b.b, shader, i,
							      &sctx->null_const_buf);
			}
		}

		/* Clear the NULL constant buffer, because loads should return zeros. */
		sctx->b.clear_buffer(&sctx->b.b, sctx->null_const_buf.buffer, 0,
				     sctx->null_const_buf.buffer->width0, 0);
	}

	return &sctx->b.b;
fail:
	si_destroy_context(&sctx->b.b);
	return NULL;
}
Example #3
0
static struct pipe_context *si_create_context(struct pipe_screen *screen,
                                              void *priv, unsigned flags)
{
	struct si_context *sctx = CALLOC_STRUCT(si_context);
	struct si_screen* sscreen = (struct si_screen *)screen;
	struct radeon_winsys *ws = sscreen->b.ws;
	int shader, i;

	if (!sctx)
		return NULL;

	if (sscreen->b.debug_flags & DBG_CHECK_VM)
		flags |= PIPE_CONTEXT_DEBUG;

	if (flags & PIPE_CONTEXT_DEBUG)
		sscreen->record_llvm_ir = true; /* racy but not critical */

	sctx->b.b.screen = screen; /* this must be set first */
	sctx->b.b.priv = priv;
	sctx->b.b.destroy = si_destroy_context;
	sctx->b.b.emit_string_marker = si_emit_string_marker;
	sctx->b.set_atom_dirty = (void *)si_set_atom_dirty;
	sctx->screen = sscreen; /* Easy accessing of screen/winsys. */
	sctx->is_debug = (flags & PIPE_CONTEXT_DEBUG) != 0;

	if (!r600_common_context_init(&sctx->b, &sscreen->b))
		goto fail;

	if (sscreen->b.info.drm_major == 3)
		sctx->b.b.get_device_reset_status = si_amdgpu_get_reset_status;

	si_init_blit_functions(sctx);
	si_init_compute_functions(sctx);
	si_init_cp_dma_functions(sctx);
	si_init_debug_functions(sctx);

	if (sscreen->b.info.has_uvd) {
		sctx->b.b.create_video_codec = si_uvd_create_decoder;
		sctx->b.b.create_video_buffer = si_video_buffer_create;
	} else {
		sctx->b.b.create_video_codec = vl_create_decoder;
		sctx->b.b.create_video_buffer = vl_video_buffer_create;
	}

	sctx->b.gfx.cs = ws->cs_create(sctx->b.ctx, RING_GFX,
				       si_context_gfx_flush, sctx);

	if (!(sscreen->b.debug_flags & DBG_NO_CE) && ws->cs_add_const_ib) {
		sctx->ce_ib = ws->cs_add_const_ib(sctx->b.gfx.cs);
		if (!sctx->ce_ib)
			goto fail;

		if (ws->cs_add_const_preamble_ib) {
			sctx->ce_preamble_ib =
			           ws->cs_add_const_preamble_ib(sctx->b.gfx.cs);

			if (!sctx->ce_preamble_ib)
				goto fail;
		}

		sctx->ce_suballocator =
				u_suballocator_create(&sctx->b.b, 1024 * 1024,
						      PIPE_BIND_CUSTOM,
						      PIPE_USAGE_DEFAULT, false);
		if (!sctx->ce_suballocator)
			goto fail;
	}

	sctx->b.gfx.flush = si_context_gfx_flush;

	/* Border colors. */
	sctx->border_color_table = malloc(SI_MAX_BORDER_COLORS *
					  sizeof(*sctx->border_color_table));
	if (!sctx->border_color_table)
		goto fail;

	sctx->border_color_buffer = (struct r600_resource*)
		pipe_buffer_create(screen, PIPE_BIND_CUSTOM, PIPE_USAGE_DEFAULT,
				   SI_MAX_BORDER_COLORS *
				   sizeof(*sctx->border_color_table));
	if (!sctx->border_color_buffer)
		goto fail;

	sctx->border_color_map =
		ws->buffer_map(sctx->border_color_buffer->buf,
			       NULL, PIPE_TRANSFER_WRITE);
	if (!sctx->border_color_map)
		goto fail;

	si_init_all_descriptors(sctx);
	si_init_state_functions(sctx);
	si_init_shader_functions(sctx);

	if (sctx->b.chip_class >= CIK)
		cik_init_sdma_functions(sctx);
	else
		si_init_dma_functions(sctx);

	if (sscreen->b.debug_flags & DBG_FORCE_DMA)
		sctx->b.b.resource_copy_region = sctx->b.dma_copy;

	sctx->blitter = util_blitter_create(&sctx->b.b);
	if (sctx->blitter == NULL)
		goto fail;
	sctx->blitter->draw_rectangle = r600_draw_rectangle;

	sctx->sample_mask.sample_mask = 0xffff;

	/* these must be last */
	si_begin_new_cs(sctx);
	r600_query_init_backend_mask(&sctx->b); /* this emits commands and must be last */

	/* CIK cannot unbind a constant buffer (S_BUFFER_LOAD is buggy
	 * with a NULL buffer). We need to use a dummy buffer instead. */
	if (sctx->b.chip_class == CIK) {
		sctx->null_const_buf.buffer = pipe_buffer_create(screen, PIPE_BIND_CONSTANT_BUFFER,
								 PIPE_USAGE_DEFAULT, 16);
		if (!sctx->null_const_buf.buffer)
			goto fail;
		sctx->null_const_buf.buffer_size = sctx->null_const_buf.buffer->width0;

		for (shader = 0; shader < SI_NUM_SHADERS; shader++) {
			for (i = 0; i < SI_NUM_CONST_BUFFERS; i++) {
				sctx->b.b.set_constant_buffer(&sctx->b.b, shader, i,
							      &sctx->null_const_buf);
			}
		}

		/* Clear the NULL constant buffer, because loads should return zeros. */
		sctx->b.clear_buffer(&sctx->b.b, sctx->null_const_buf.buffer, 0,
				     sctx->null_const_buf.buffer->width0, 0,
				     R600_COHERENCY_SHADER);
	}

	uint64_t max_threads_per_block;
	screen->get_compute_param(screen, PIPE_SHADER_IR_TGSI,
				  PIPE_COMPUTE_CAP_MAX_THREADS_PER_BLOCK,
				  &max_threads_per_block);

	/* The maximum number of scratch waves. Scratch space isn't divided
	 * evenly between CUs. The number is only a function of the number of CUs.
	 * We can decrease the constant to decrease the scratch buffer size.
	 *
	 * sctx->scratch_waves must be >= the maximum posible size of
	 * 1 threadgroup, so that the hw doesn't hang from being unable
	 * to start any.
	 *
	 * The recommended value is 4 per CU at most. Higher numbers don't
	 * bring much benefit, but they still occupy chip resources (think
	 * async compute). I've seen ~2% performance difference between 4 and 32.
	 */
	sctx->scratch_waves = MAX2(32 * sscreen->b.info.num_good_compute_units,
				   max_threads_per_block / 64);

	sctx->tm = si_create_llvm_target_machine(sscreen);

	return &sctx->b.b;
fail:
	fprintf(stderr, "radeonsi: Failed to create a context.\n");
	si_destroy_context(&sctx->b.b);
	return NULL;
}
Example #4
0
static struct pipe_context *si_create_context(struct pipe_screen *screen,
                                              void *priv, unsigned flags)
{
	struct si_context *sctx = CALLOC_STRUCT(si_context);
	struct si_screen* sscreen = (struct si_screen *)screen;
	struct radeon_winsys *ws = sscreen->b.ws;
	LLVMTargetRef r600_target;
	const char *triple = "amdgcn--";
	int shader, i;

	if (!sctx)
		return NULL;

	if (sscreen->b.debug_flags & DBG_CHECK_VM)
		flags |= PIPE_CONTEXT_DEBUG;

	sctx->b.b.screen = screen; /* this must be set first */
	sctx->b.b.priv = priv;
	sctx->b.b.destroy = si_destroy_context;
	sctx->b.set_atom_dirty = (void *)si_set_atom_dirty;
	sctx->screen = sscreen; /* Easy accessing of screen/winsys. */
	sctx->is_debug = (flags & PIPE_CONTEXT_DEBUG) != 0;

	if (!r600_common_context_init(&sctx->b, &sscreen->b))
		goto fail;

	if (sscreen->b.info.drm_major == 3)
		sctx->b.b.get_device_reset_status = si_amdgpu_get_reset_status;

	si_init_blit_functions(sctx);
	si_init_compute_functions(sctx);
	si_init_cp_dma_functions(sctx);
	si_init_debug_functions(sctx);

	if (sscreen->b.info.has_uvd) {
		sctx->b.b.create_video_codec = si_uvd_create_decoder;
		sctx->b.b.create_video_buffer = si_video_buffer_create;
	} else {
		sctx->b.b.create_video_codec = vl_create_decoder;
		sctx->b.b.create_video_buffer = vl_video_buffer_create;
	}

	sctx->b.gfx.cs = ws->cs_create(sctx->b.ctx, RING_GFX,
				       si_context_gfx_flush, sctx);

	if (!(sscreen->b.debug_flags & DBG_NO_CE) && ws->cs_add_const_ib) {
		sctx->ce_ib = ws->cs_add_const_ib(sctx->b.gfx.cs);
		if (!sctx->ce_ib)
			goto fail;

		if (ws->cs_add_const_preamble_ib) {
			sctx->ce_preamble_ib =
			           ws->cs_add_const_preamble_ib(sctx->b.gfx.cs);

			if (!sctx->ce_preamble_ib)
				goto fail;
		}

		sctx->ce_suballocator =
				u_suballocator_create(&sctx->b.b, 1024 * 1024,
						      64, PIPE_BIND_CUSTOM,
						      PIPE_USAGE_DEFAULT, FALSE);
		if (!sctx->ce_suballocator)
			goto fail;
	}

	sctx->b.gfx.flush = si_context_gfx_flush;

	/* Border colors. */
	sctx->border_color_table = malloc(SI_MAX_BORDER_COLORS *
					  sizeof(*sctx->border_color_table));
	if (!sctx->border_color_table)
		goto fail;

	sctx->border_color_buffer = (struct r600_resource*)
		pipe_buffer_create(screen, PIPE_BIND_CUSTOM, PIPE_USAGE_DEFAULT,
				   SI_MAX_BORDER_COLORS *
				   sizeof(*sctx->border_color_table));
	if (!sctx->border_color_buffer)
		goto fail;

	sctx->border_color_map =
		ws->buffer_map(sctx->border_color_buffer->buf,
			       NULL, PIPE_TRANSFER_WRITE);
	if (!sctx->border_color_map)
		goto fail;

	si_init_all_descriptors(sctx);
	si_init_state_functions(sctx);
	si_init_shader_functions(sctx);

	if (sctx->b.chip_class >= CIK)
		cik_init_sdma_functions(sctx);
	else
		si_init_dma_functions(sctx);

	if (sscreen->b.debug_flags & DBG_FORCE_DMA)
		sctx->b.b.resource_copy_region = sctx->b.dma_copy;

	sctx->blitter = util_blitter_create(&sctx->b.b);
	if (sctx->blitter == NULL)
		goto fail;
	sctx->blitter->draw_rectangle = r600_draw_rectangle;

	sctx->sample_mask.sample_mask = 0xffff;

	/* these must be last */
	si_begin_new_cs(sctx);
	r600_query_init_backend_mask(&sctx->b); /* this emits commands and must be last */

	/* CIK cannot unbind a constant buffer (S_BUFFER_LOAD is buggy
	 * with a NULL buffer). We need to use a dummy buffer instead. */
	if (sctx->b.chip_class == CIK) {
		sctx->null_const_buf.buffer = pipe_buffer_create(screen, PIPE_BIND_CONSTANT_BUFFER,
								 PIPE_USAGE_DEFAULT, 16);
		if (!sctx->null_const_buf.buffer)
			goto fail;
		sctx->null_const_buf.buffer_size = sctx->null_const_buf.buffer->width0;

		for (shader = 0; shader < SI_NUM_SHADERS; shader++) {
			for (i = 0; i < SI_NUM_CONST_BUFFERS; i++) {
				sctx->b.b.set_constant_buffer(&sctx->b.b, shader, i,
							      &sctx->null_const_buf);
			}
		}

		/* Clear the NULL constant buffer, because loads should return zeros. */
		sctx->b.clear_buffer(&sctx->b.b, sctx->null_const_buf.buffer, 0,
				     sctx->null_const_buf.buffer->width0, 0,
				     R600_COHERENCY_SHADER);
	}

	/* XXX: This is the maximum value allowed.  I'm not sure how to compute
	 * this for non-cs shaders.  Using the wrong value here can result in
	 * GPU lockups, but the maximum value seems to always work.
	 */
	sctx->scratch_waves = 32 * sscreen->b.info.num_good_compute_units;

	/* Initialize LLVM TargetMachine */
	r600_target = radeon_llvm_get_r600_target(triple);
	sctx->tm = LLVMCreateTargetMachine(r600_target, triple,
					   r600_get_llvm_processor_name(sscreen->b.family),
#if HAVE_LLVM >= 0x0308
					   sscreen->b.debug_flags & DBG_SI_SCHED ?
					   	"+DumpCode,+vgpr-spilling,+si-scheduler" :
#endif
					   	"+DumpCode,+vgpr-spilling",
					   LLVMCodeGenLevelDefault,
					   LLVMRelocDefault,
					   LLVMCodeModelDefault);

	return &sctx->b.b;
fail:
	fprintf(stderr, "radeonsi: Failed to create a context.\n");
	si_destroy_context(&sctx->b.b);
	return NULL;
}
Example #5
0
static struct pipe_context *si_create_context(struct pipe_screen *screen, void *priv)
{
	struct si_context *sctx = CALLOC_STRUCT(si_context);
	struct si_screen* sscreen = (struct si_screen *)screen;
	struct radeon_winsys *ws = sscreen->b.ws;
	LLVMTargetRef r600_target;
#if HAVE_LLVM >= 0x0306
	const char *triple = "amdgcn--";
#endif
	int shader, i;

	if (sctx == NULL)
		return NULL;

	sctx->b.b.screen = screen; /* this must be set first */
	sctx->b.b.priv = priv;
	sctx->b.b.destroy = si_destroy_context;
	sctx->b.set_atom_dirty = (void *)si_set_atom_dirty;
	sctx->screen = sscreen; /* Easy accessing of screen/winsys. */

	if (!r600_common_context_init(&sctx->b, &sscreen->b))
		goto fail;

	if (sscreen->b.info.drm_major == 3)
		sctx->b.b.get_device_reset_status = si_amdgpu_get_reset_status;

	si_init_blit_functions(sctx);
	si_init_compute_functions(sctx);
	si_init_cp_dma_functions(sctx);

	if (sscreen->b.info.has_uvd) {
		sctx->b.b.create_video_codec = si_uvd_create_decoder;
		sctx->b.b.create_video_buffer = si_video_buffer_create;
	} else {
		sctx->b.b.create_video_codec = vl_create_decoder;
		sctx->b.b.create_video_buffer = vl_video_buffer_create;
	}

	sctx->b.rings.gfx.cs = ws->cs_create(sctx->b.ctx, RING_GFX, si_context_gfx_flush,
					     sctx, sscreen->b.trace_bo ?
						sscreen->b.trace_bo->cs_buf : NULL);
	sctx->b.rings.gfx.flush = si_context_gfx_flush;

	si_init_all_descriptors(sctx);

	/* Initialize cache_flush. */
	sctx->cache_flush = si_atom_cache_flush;
	sctx->atoms.s.cache_flush = &sctx->cache_flush;

	sctx->msaa_sample_locs = si_atom_msaa_sample_locs;
	sctx->atoms.s.msaa_sample_locs = &sctx->msaa_sample_locs;

	sctx->msaa_config = si_atom_msaa_config;
	sctx->atoms.s.msaa_config = &sctx->msaa_config;

	sctx->atoms.s.streamout_begin = &sctx->b.streamout.begin_atom;
	sctx->atoms.s.streamout_enable = &sctx->b.streamout.enable_atom;

	si_init_state_functions(sctx);
	si_init_shader_functions(sctx);

	if (sscreen->b.debug_flags & DBG_FORCE_DMA)
		sctx->b.b.resource_copy_region = sctx->b.dma_copy;

	sctx->blitter = util_blitter_create(&sctx->b.b);
	if (sctx->blitter == NULL)
		goto fail;
	sctx->blitter->draw_rectangle = r600_draw_rectangle;

	/* these must be last */
	si_begin_new_cs(sctx);
	r600_query_init_backend_mask(&sctx->b); /* this emits commands and must be last */

	/* CIK cannot unbind a constant buffer (S_BUFFER_LOAD is buggy
	 * with a NULL buffer). We need to use a dummy buffer instead. */
	if (sctx->b.chip_class == CIK) {
		sctx->null_const_buf.buffer = pipe_buffer_create(screen, PIPE_BIND_CONSTANT_BUFFER,
								 PIPE_USAGE_DEFAULT, 16);
		if (!sctx->null_const_buf.buffer)
			goto fail;
		sctx->null_const_buf.buffer_size = sctx->null_const_buf.buffer->width0;

		for (shader = 0; shader < SI_NUM_SHADERS; shader++) {
			for (i = 0; i < SI_NUM_CONST_BUFFERS; i++) {
				sctx->b.b.set_constant_buffer(&sctx->b.b, shader, i,
							      &sctx->null_const_buf);
			}
		}

		/* Clear the NULL constant buffer, because loads should return zeros. */
		sctx->b.clear_buffer(&sctx->b.b, sctx->null_const_buf.buffer, 0,
				     sctx->null_const_buf.buffer->width0, 0, false);
	}

	/* XXX: This is the maximum value allowed.  I'm not sure how to compute
	 * this for non-cs shaders.  Using the wrong value here can result in
	 * GPU lockups, but the maximum value seems to always work.
	 */
	sctx->scratch_waves = 32 * sscreen->b.info.max_compute_units;

#if HAVE_LLVM >= 0x0306
	/* Initialize LLVM TargetMachine */
	r600_target = radeon_llvm_get_r600_target(triple);
	sctx->tm = LLVMCreateTargetMachine(r600_target, triple,
					   r600_get_llvm_processor_name(sscreen->b.family),
					   "+DumpCode,+vgpr-spilling",
					   LLVMCodeGenLevelDefault,
					   LLVMRelocDefault,
					   LLVMCodeModelDefault);
#endif

	return &sctx->b.b;
fail:
	si_destroy_context(&sctx->b.b);
	return NULL;
}