src/mesa/drivers/dri/i965/brw_program.c

/*
 Copyright (C) Intel Corp.  2006.  All Rights Reserved.
 Intel funded Tungsten Graphics 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 <keithw@vmware.com>
  */

#include <pthread.h>
#include "main/imports.h"
#include "program/prog_parameter.h"
#include "program/prog_print.h"
#include "program/prog_to_nir.h"
#include "program/program.h"
#include "program/programopt.h"
#include "tnl/tnl.h"
#include "util/ralloc.h"
#include "compiler/glsl/ir.h"
#include "compiler/glsl/glsl_to_nir.h"

#include "brw_program.h"
#include "brw_context.h"
#include "brw_shader.h"
#include "brw_nir.h"
#include "intel_batchbuffer.h"

static void
brw_nir_lower_uniforms(nir_shader *nir, bool is_scalar)
{
   if (is_scalar) {
      nir_assign_var_locations(&nir->uniforms, &nir->num_uniforms,
                               type_size_scalar_bytes);
      nir_lower_io(nir, nir_var_uniform, type_size_scalar_bytes, 0);
   } else {
      nir_assign_var_locations(&nir->uniforms, &nir->num_uniforms,
                               type_size_vec4_bytes);
      nir_lower_io(nir, nir_var_uniform, type_size_vec4_bytes, 0);
   }
}

nir_shader *
brw_create_nir(struct brw_context *brw,
               const struct gl_shader_program *shader_prog,
               struct gl_program *prog,
               gl_shader_stage stage,
               bool is_scalar)
{
   struct gl_context *ctx = &brw->ctx;
   const nir_shader_compiler_options *options =
      ctx->Const.ShaderCompilerOptions[stage].NirOptions;
   bool progress;
   nir_shader *nir;

   /* First, lower the GLSL IR or Mesa IR to NIR */
   if (shader_prog) {
      nir = glsl_to_nir(shader_prog, stage, options);
      nir_remove_dead_variables(nir, nir_var_shader_in | nir_var_shader_out);
      nir_lower_returns(nir);
      nir_validate_shader(nir);
      NIR_PASS_V(nir, nir_lower_io_to_temporaries,
                 nir_shader_get_entrypoint(nir), true, false);
   } else {
      nir = prog_to_nir(prog, options);
      NIR_PASS_V(nir, nir_convert_to_ssa); /* turn registers into SSA */
   }
   nir_validate_shader(nir);

   (void)progress;

   nir = brw_preprocess_nir(brw->screen->compiler, nir);

   if (stage == MESA_SHADER_FRAGMENT) {
      static const struct nir_lower_wpos_ytransform_options wpos_options = {
         .state_tokens = {STATE_INTERNAL, STATE_FB_WPOS_Y_TRANSFORM, 0, 0, 0},
         .fs_coord_pixel_center_integer = 1,
         .fs_coord_origin_upper_left = 1,
      };
      _mesa_add_state_reference(prog->Parameters,
                                (gl_state_index *) wpos_options.state_tokens);

      NIR_PASS(progress, nir, nir_lower_wpos_ytransform, &wpos_options);
   }

   NIR_PASS(progress, nir, nir_lower_system_values);
   NIR_PASS_V(nir, brw_nir_lower_uniforms, is_scalar);

   nir_shader_gather_info(nir, nir_shader_get_entrypoint(nir));

   /* nir_shader may have been cloned so make sure shader_info is in sync */
   if (nir->info != &prog->info) {
      const char *name = prog->info.name;
      const char *label = prog->info.label;
      prog->info = *nir->info;
      prog->info.name = name;
      prog->info.label = label;
   }

   if (shader_prog) {
      NIR_PASS_V(nir, nir_lower_samplers, shader_prog);
      NIR_PASS_V(nir, nir_lower_atomics, shader_prog);
   }

   return nir;
}

static unsigned
get_new_program_id(struct intel_screen *screen)
{
   static pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
   pthread_mutex_lock(&m);
   unsigned id = screen->program_id++;
   pthread_mutex_unlock(&m);
   return id;
}

static struct gl_program *brwNewProgram( struct gl_context *ctx,
				      GLenum target,
				      GLuint id )
{
   struct brw_context *brw = brw_context(ctx);

   switch (target) {
   case GL_VERTEX_PROGRAM_ARB:
   case GL_TESS_CONTROL_PROGRAM_NV:
   case GL_TESS_EVALUATION_PROGRAM_NV:
   case GL_GEOMETRY_PROGRAM_NV:
   case GL_COMPUTE_PROGRAM_NV: {
      struct brw_program *prog = rzalloc(NULL, struct brw_program);
      if (prog) {
	 prog->id = get_new_program_id(brw->screen);

	 return _mesa_init_gl_program(&prog->program, target, id);
      }
      else
	 return NULL;
   }

   case GL_FRAGMENT_PROGRAM_ARB: {
      struct brw_program *prog;
      if (brw->gen < 6) {
         struct gen4_fragment_program *g4_prog =
            rzalloc(NULL, struct gen4_fragment_program);
         prog = &g4_prog->base;
      } else {
         prog = rzalloc(NULL, struct brw_program);
      }

      if (prog) {
	 prog->id = get_new_program_id(brw->screen);

	 return _mesa_init_gl_program(&prog->program, target, id);
      }
      else
	 return NULL;
   }

   default:
      unreachable("Unsupported target in brwNewProgram()");
   }
}

static void brwDeleteProgram( struct gl_context *ctx,
			      struct gl_program *prog )
{
   _mesa_delete_program( ctx, prog );
}


static GLboolean
brwProgramStringNotify(struct gl_context *ctx,
		       GLenum target,
		       struct gl_program *prog)
{
   assert(target == GL_VERTEX_PROGRAM_ARB || !prog->arb.IsPositionInvariant);

   struct brw_context *brw = brw_context(ctx);
   const struct brw_compiler *compiler = brw->screen->compiler;

   switch (target) {
   case GL_FRAGMENT_PROGRAM_ARB: {
      struct brw_program *newFP = brw_program(prog);
      const struct brw_program *curFP =
         brw_program_const(brw->fragment_program);

      if (newFP == curFP)
	 brw->ctx.NewDriverState |= BRW_NEW_FRAGMENT_PROGRAM;
      newFP->id = get_new_program_id(brw->screen);

      brw_add_texrect_params(prog);

      prog->nir = brw_create_nir(brw, NULL, prog, MESA_SHADER_FRAGMENT, true);

      brw_fs_precompile(ctx, NULL, prog);
      break;
   }
   case GL_VERTEX_PROGRAM_ARB: {
      struct brw_program *newVP = brw_program(prog);
      const struct brw_program *curVP =
         brw_program_const(brw->vertex_program);

      if (newVP == curVP)
	 brw->ctx.NewDriverState |= BRW_NEW_VERTEX_PROGRAM;
      if (newVP->program.arb.IsPositionInvariant) {
	 _mesa_insert_mvp_code(ctx, &newVP->program);
      }
      newVP->id = get_new_program_id(brw->screen);

      /* Also tell tnl about it:
       */
      _tnl_program_string(ctx, target, prog);

      brw_add_texrect_params(prog);

      prog->nir = brw_create_nir(brw, NULL, prog, MESA_SHADER_VERTEX,
                                 compiler->scalar_stage[MESA_SHADER_VERTEX]);

      brw_vs_precompile(ctx, NULL, prog);
      break;
   }
   default:
      /*
       * driver->ProgramStringNotify is only called for ARB programs, fixed
       * function vertex programs, and ir_to_mesa (which isn't used by the
       * i965 back-end).  Therefore, even after geometry shaders are added,
       * this function should only ever be called with a target of
       * GL_VERTEX_PROGRAM_ARB or GL_FRAGMENT_PROGRAM_ARB.
       */
      unreachable("Unexpected target in brwProgramStringNotify");
   }

   return true;
}

static void
brw_memory_barrier(struct gl_context *ctx, GLbitfield barriers)
{
   struct brw_context *brw = brw_context(ctx);
   unsigned bits = (PIPE_CONTROL_DATA_CACHE_FLUSH |
                    PIPE_CONTROL_NO_WRITE |
                    PIPE_CONTROL_CS_STALL);
   assert(brw->gen >= 7 && brw->gen <= 9);

   if (barriers & (GL_VERTEX_ATTRIB_ARRAY_BARRIER_BIT |
                   GL_ELEMENT_ARRAY_BARRIER_BIT |
                   GL_COMMAND_BARRIER_BIT))
      bits |= PIPE_CONTROL_VF_CACHE_INVALIDATE;

   if (barriers & GL_UNIFORM_BARRIER_BIT)
      bits |= (PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE |
               PIPE_CONTROL_CONST_CACHE_INVALIDATE);

   if (barriers & GL_TEXTURE_FETCH_BARRIER_BIT)
      bits |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;

   if (barriers & GL_TEXTURE_UPDATE_BARRIER_BIT)
      bits |= PIPE_CONTROL_RENDER_TARGET_FLUSH;

   if (barriers & GL_FRAMEBUFFER_BARRIER_BIT)
      bits |= (PIPE_CONTROL_DEPTH_CACHE_FLUSH |
               PIPE_CONTROL_RENDER_TARGET_FLUSH);

   /* Typed surface messages are handled by the render cache on IVB, so we
    * need to flush it too.
    */
   if (brw->gen == 7 && !brw->is_haswell)
      bits |= PIPE_CONTROL_RENDER_TARGET_FLUSH;

   brw_emit_pipe_control_flush(brw, bits);
}

static void
brw_blend_barrier(struct gl_context *ctx)
{
   struct brw_context *brw = brw_context(ctx);

   if (!ctx->Extensions.MESA_shader_framebuffer_fetch) {
      if (brw->gen >= 6) {
         brw_emit_pipe_control_flush(brw,
                                     PIPE_CONTROL_RENDER_TARGET_FLUSH |
                                     PIPE_CONTROL_CS_STALL);
         brw_emit_pipe_control_flush(brw,
                                     PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE);
      } else {
         brw_emit_pipe_control_flush(brw,
                                     PIPE_CONTROL_RENDER_TARGET_FLUSH);
      }
   }
}

void
brw_add_texrect_params(struct gl_program *prog)
{
   for (int texunit = 0; texunit < BRW_MAX_TEX_UNIT; texunit++) {
      if (!(prog->TexturesUsed[texunit] & (1 << TEXTURE_RECT_INDEX)))
         continue;

      int tokens[STATE_LENGTH] = {
         STATE_INTERNAL,
         STATE_TEXRECT_SCALE,
         texunit,
         0,
         0
      };

      _mesa_add_state_reference(prog->Parameters, (gl_state_index *)tokens);
   }
}

void
brw_get_scratch_bo(struct brw_context *brw,
		   drm_intel_bo **scratch_bo, int size)
{
   drm_intel_bo *old_bo = *scratch_bo;

   if (old_bo && old_bo->size < size) {
      drm_intel_bo_unreference(old_bo);
      old_bo = NULL;
   }

   if (!old_bo) {
      *scratch_bo = drm_intel_bo_alloc(brw->bufmgr, "scratch bo", size, 4096);
   }
}

/**
 * Reserve enough scratch space for the given stage to hold \p per_thread_size
 * bytes times the given \p thread_count.
 */
void
brw_alloc_stage_scratch(struct brw_context *brw,
                        struct brw_stage_state *stage_state,
                        unsigned per_thread_size,
                        unsigned thread_count)
{
   if (stage_state->per_thread_scratch < per_thread_size) {
      stage_state->per_thread_scratch = per_thread_size;

      if (stage_state->scratch_bo)
         drm_intel_bo_unreference(stage_state->scratch_bo);

      stage_state->scratch_bo =
         drm_intel_bo_alloc(brw->bufmgr, "shader scratch space",
                            per_thread_size * thread_count, 4096);
   }
}

void brwInitFragProgFuncs( struct dd_function_table *functions )
{
   assert(functions->ProgramStringNotify == _tnl_program_string);

   functions->NewProgram = brwNewProgram;
   functions->DeleteProgram = brwDeleteProgram;
   functions->ProgramStringNotify = brwProgramStringNotify;

   functions->NewShader = brw_new_shader;
   functions->LinkShader = brw_link_shader;

   functions->MemoryBarrier = brw_memory_barrier;
   functions->BlendBarrier = brw_blend_barrier;
}

struct shader_times {
   uint64_t time;
   uint64_t written;
   uint64_t reset;
};

void
brw_init_shader_time(struct brw_context *brw)
{
   const int max_entries = 2048;
   brw->shader_time.bo =
      drm_intel_bo_alloc(brw->bufmgr, "shader time",
                         max_entries * SHADER_TIME_STRIDE * 3, 4096);
   brw->shader_time.names = rzalloc_array(brw, const char *, max_entries);
   brw->shader_time.ids = rzalloc_array(brw, int, max_entries);
   brw->shader_time.types = rzalloc_array(brw, enum shader_time_shader_type,
                                          max_entries);
   brw->shader_time.cumulative = rzalloc_array(brw, struct shader_times,
                                               max_entries);
   brw->shader_time.max_entries = max_entries;
}

static int
compare_time(const void *a, const void *b)
{
   uint64_t * const *a_val = a;
   uint64_t * const *b_val = b;

   /* We don't just subtract because we're turning the value to an int. */
   if (**a_val < **b_val)
      return -1;
   else if (**a_val == **b_val)
      return 0;
   else
      return 1;
}

static void
print_shader_time_line(const char *stage, const char *name,
                       int shader_num, uint64_t time, uint64_t total)
{
   fprintf(stderr, "%-6s%-18s", stage, name);

   if (shader_num != 0)
      fprintf(stderr, "%4d: ", shader_num);
   else
      fprintf(stderr, "    : ");

   fprintf(stderr, "%16lld (%7.2f Gcycles)      %4.1f%%\n",
           (long long)time,
           (double)time / 1000000000.0,
           (double)time / total * 100.0);
}

static void
brw_report_shader_time(struct brw_context *brw)
{
   if (!brw->shader_time.bo || !brw->shader_time.num_entries)
      return;

   uint64_t scaled[brw->shader_time.num_entries];
   uint64_t *sorted[brw->shader_time.num_entries];
   uint64_t total_by_type[ST_CS + 1];
   memset(total_by_type, 0, sizeof(total_by_type));
   double total = 0;
   for (int i = 0; i < brw->shader_time.num_entries; i++) {
      uint64_t written = 0, reset = 0;
      enum shader_time_shader_type type = brw->shader_time.types[i];

      sorted[i] = &scaled[i];

      switch (type) {
      case ST_VS:
      case ST_TCS:
      case ST_TES:
      case ST_GS:
      case ST_FS8:
      case ST_FS16:
      case ST_CS:
         written = brw->shader_time.cumulative[i].written;
         reset = brw->shader_time.cumulative[i].reset;
         break;

      default:
         /* I sometimes want to print things that aren't the 3 shader times.
          * Just print the sum in that case.
          */
         written = 1;
         reset = 0;
         break;
      }

      uint64_t time = brw->shader_time.cumulative[i].time;
      if (written) {
         scaled[i] = time / written * (written + reset);
      } else {
         scaled[i] = time;
      }

      switch (type) {
      case ST_VS:
      case ST_TCS:
      case ST_TES:
      case ST_GS:
      case ST_FS8:
      case ST_FS16:
      case ST_CS:
         total_by_type[type] += scaled[i];
         break;
      default:
         break;
      }

      total += scaled[i];
   }

   if (total == 0) {
      fprintf(stderr, "No shader time collected yet\n");
      return;
   }

   qsort(sorted, brw->shader_time.num_entries, sizeof(sorted[0]), compare_time);

   fprintf(stderr, "\n");
   fprintf(stderr, "type          ID                  cycles spent                   %% of total\n");
   for (int s = 0; s < brw->shader_time.num_entries; s++) {
      const char *stage;
      /* Work back from the sorted pointers times to a time to print. */
      int i = sorted[s] - scaled;

      if (scaled[i] == 0)
         continue;

      int shader_num = brw->shader_time.ids[i];
      const char *shader_name = brw->shader_time.names[i];

      switch (brw->shader_time.types[i]) {
      case ST_VS:
         stage = "vs";
         break;
      case ST_TCS:
         stage = "tcs";
         break;
      case ST_TES:
         stage = "tes";
         break;
      case ST_GS:
         stage = "gs";
         break;
      case ST_FS8:
         stage = "fs8";
         break;
      case ST_FS16:
         stage = "fs16";
         break;
      case ST_CS:
         stage = "cs";
         break;
      default:
         stage = "other";
         break;
      }

      print_shader_time_line(stage, shader_name, shader_num,
                             scaled[i], total);
   }

   fprintf(stderr, "\n");
   print_shader_time_line("total", "vs", 0, total_by_type[ST_VS], total);
   print_shader_time_line("total", "tcs", 0, total_by_type[ST_TCS], total);
   print_shader_time_line("total", "tes", 0, total_by_type[ST_TES], total);
   print_shader_time_line("total", "gs", 0, total_by_type[ST_GS], total);
   print_shader_time_line("total", "fs8", 0, total_by_type[ST_FS8], total);
   print_shader_time_line("total", "fs16", 0, total_by_type[ST_FS16], total);
   print_shader_time_line("total", "cs", 0, total_by_type[ST_CS], total);
}

static void
brw_collect_shader_time(struct brw_context *brw)
{
   if (!brw->shader_time.bo)
      return;

   /* This probably stalls on the last rendering.  We could fix that by
    * delaying reading the reports, but it doesn't look like it's a big
    * overhead compared to the cost of tracking the time in the first place.
    */
   drm_intel_bo_map(brw->shader_time.bo, true);
   void *bo_map = brw->shader_time.bo->virtual;

   for (int i = 0; i < brw->shader_time.num_entries; i++) {
      uint32_t *times = bo_map + i * 3 * SHADER_TIME_STRIDE;

      brw->shader_time.cumulative[i].time += times[SHADER_TIME_STRIDE * 0 / 4];
      brw->shader_time.cumulative[i].written += times[SHADER_TIME_STRIDE * 1 / 4];
      brw->shader_time.cumulative[i].reset += times[SHADER_TIME_STRIDE * 2 / 4];
   }

   /* Zero the BO out to clear it out for our next collection.
    */
   memset(bo_map, 0, brw->shader_time.bo->size);
   drm_intel_bo_unmap(brw->shader_time.bo);
}

void
brw_collect_and_report_shader_time(struct brw_context *brw)
{
   brw_collect_shader_time(brw);

   if (brw->shader_time.report_time == 0 ||
       get_time() - brw->shader_time.report_time >= 1.0) {
      brw_report_shader_time(brw);
      brw->shader_time.report_time = get_time();
   }
}

/**
 * Chooses an index in the shader_time buffer and sets up tracking information
 * for our printouts.
 *
 * Note that this holds on to references to the underlying programs, which may
 * change their lifetimes compared to normal operation.
 */
int
brw_get_shader_time_index(struct brw_context *brw,
                          struct gl_shader_program *shader_prog,
                          struct gl_program *prog,
                          enum shader_time_shader_type type)
{
   int shader_time_index = brw->shader_time.num_entries++;
   assert(shader_time_index < brw->shader_time.max_entries);
   brw->shader_time.types[shader_time_index] = type;

   int id = shader_prog ? shader_prog->Name : prog->Id;
   const char *name;
   if (id == 0) {
      name = "ff";
   } else if (!shader_prog) {
      name = "prog";
   } else if (shader_prog->Label) {
      name = ralloc_strdup(brw->shader_time.names, shader_prog->Label);
   } else {
      name = "glsl";
   }

   brw->shader_time.names[shader_time_index] = name;
   brw->shader_time.ids[shader_time_index] = id;

   return shader_time_index;
}

void
brw_destroy_shader_time(struct brw_context *brw)
{
   drm_intel_bo_unreference(brw->shader_time.bo);
   brw->shader_time.bo = NULL;
}

void
brw_stage_prog_data_free(const void *p)
{
   struct brw_stage_prog_data *prog_data = (struct brw_stage_prog_data *)p;

   ralloc_free(prog_data->param);
   ralloc_free(prog_data->pull_param);
   ralloc_free(prog_data->image_param);
}

void
brw_dump_arb_asm(const char *stage, struct gl_program *prog)
{
   fprintf(stderr, "ARB_%s_program %d ir for native %s shader\n",
           stage, prog->Id, stage);
   _mesa_print_program(prog);
}

void
brw_setup_tex_for_precompile(struct brw_context *brw,
                             struct brw_sampler_prog_key_data *tex,
                             struct gl_program *prog)
{
   const bool has_shader_channel_select = brw->is_haswell || brw->gen >= 8;
   unsigned sampler_count = util_last_bit(prog->SamplersUsed);
   for (unsigned i = 0; i < sampler_count; i++) {
      if (!has_shader_channel_select && (prog->ShadowSamplers & (1 << i))) {
         /* Assume DEPTH_TEXTURE_MODE is the default: X, X, X, 1 */
         tex->swizzles[i] =
            MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_X, SWIZZLE_X, SWIZZLE_ONE);
      } else {
         /* Color sampler: assume no swizzling. */
         tex->swizzles[i] = SWIZZLE_XYZW;
      }
   }
}