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/*

 * Copyright © 2011 Intel Corporation

 *

 * 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 AUTHORS OR COPYRIGHT HOLDERS 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 "main/macros.h"

#include "intel_batchbuffer.h"

#include "brw_context.h"

#include "brw_state.h"

#include "brw_defines.h"

/**

 * The following diagram shows how we partition the URB:

 *

 *        16kB or 32kB               Rest of the URB space

 *   __________-__________   _________________-_________________

 *  /                     \ /                                   \

 * +-------------------------------------------------------------+

 * |     VS/FS/GS Push     |              VS/GS URB              |

 * |       Constants       |               Entries               |

 * +-------------------------------------------------------------+

 *

 * Notably, push constants must be stored at the beginning of the URB

 * space, while entries can be stored anywhere.  Ivybridge and Haswell

 * GT1/GT2 have a maximum constant buffer size of 16kB, while Haswell GT3

 * doubles this (32kB).

 *

 * Ivybridge and Haswell GT1/GT2 allow push constants to be located (and

 * sized) in increments of 1kB.  Haswell GT3 requires them to be located and

 * sized in increments of 2kB.

 *

 * Currently we split the constant buffer space evenly among whatever stages

 * are active.  This is probably not ideal, but simple.

 *

 * Ivybridge GT1 and Haswell GT1 have 128kB of URB space.

 * Ivybridge GT2 and Haswell GT2 have 256kB of URB space.

 * Haswell GT3 has 512kB of URB space.

 *

 * See "Volume 2a: 3D Pipeline," section 1.8, "Volume 1b: Configurations",

 * and the documentation for 3DSTATE_PUSH_CONSTANT_ALLOC_xS.

 */

static void

gen7_allocate_push_constants(struct brw_context *brw)

{

   unsigned avail_size = 16;

   unsigned multiplier =

      (brw->gen >= 8 || (brw->is_haswell && brw->gt == 3)) ? 2 : 1;

   /* BRW_NEW_GEOMETRY_PROGRAM */

   bool gs_present = brw->geometry_program;

   unsigned vs_size, gs_size;

   if (gs_present) {

      vs_size = avail_size / 3;

      avail_size -= vs_size;

      gs_size = avail_size / 2;

      avail_size -= gs_size;

   } else {

      vs_size = avail_size / 2;

      avail_size -= vs_size;

      gs_size = 0;

   }

   unsigned fs_size = avail_size;

   gen7_emit_push_constant_state(brw, multiplier * vs_size,

                                 multiplier * gs_size, multiplier * fs_size);

   /* From p115 of the Ivy Bridge PRM (3.2.1.4 3DSTATE_PUSH_CONSTANT_ALLOC_VS):

    *

    *     Programming Restriction:

    *

    *     The 3DSTATE_CONSTANT_VS must be reprogrammed prior to the next

    *     3DPRIMITIVE command after programming the

    *     3DSTATE_PUSH_CONSTANT_ALLOC_VS.

    *

    * Similar text exists for the other 3DSTATE_PUSH_CONSTANT_ALLOC_*

    * commands.

    */

   brw->ctx.NewDriverState |= BRW_NEW_PUSH_CONSTANT_ALLOCATION;

}

void

gen7_emit_push_constant_state(struct brw_context *brw, unsigned vs_size,

                              unsigned gs_size, unsigned fs_size)

{

   unsigned offset = 0;

   BEGIN_BATCH(6);

   OUT_BATCH(_3DSTATE_PUSH_CONSTANT_ALLOC_VS << 16 | (2 - 2));

   OUT_BATCH(vs_size | offset << GEN7_PUSH_CONSTANT_BUFFER_OFFSET_SHIFT);

   offset += vs_size;

   OUT_BATCH(_3DSTATE_PUSH_CONSTANT_ALLOC_GS << 16 | (2 - 2));

   OUT_BATCH(gs_size | offset << GEN7_PUSH_CONSTANT_BUFFER_OFFSET_SHIFT);

   offset += gs_size;

   OUT_BATCH(_3DSTATE_PUSH_CONSTANT_ALLOC_PS << 16 | (2 - 2));

   OUT_BATCH(fs_size | offset << GEN7_PUSH_CONSTANT_BUFFER_OFFSET_SHIFT);

   ADVANCE_BATCH();

   /* From p292 of the Ivy Bridge PRM (11.2.4 3DSTATE_PUSH_CONSTANT_ALLOC_PS):

    *

    *     A PIPE_CONTOL command with the CS Stall bit set must be programmed

    *     in the ring after this instruction.

    *

    * No such restriction exists for Haswell or Baytrail.

    */

   if (brw->gen < 8 && !brw->is_haswell && !brw->is_baytrail)

      gen7_emit_cs_stall_flush(brw);

}

const struct brw_tracked_state gen7_push_constant_space = {

   .dirty = {

      .mesa = 0,

      .brw = BRW_NEW_CONTEXT | BRW_NEW_GEOMETRY_PROGRAM,

   },

   .emit = gen7_allocate_push_constants,

};

static void

gen7_upload_urb(struct brw_context *brw)

{

   const int push_size_kB =

      (brw->gen >= 8 || (brw->is_haswell && brw->gt == 3)) ? 32 : 16;

   /* BRW_NEW_VS_PROG_DATA */

   unsigned vs_size = MAX2(brw->vs.prog_data->base.urb_entry_size, 1);

   unsigned vs_entry_size_bytes = vs_size * 64;

   /* BRW_NEW_GEOMETRY_PROGRAM, BRW_NEW_GS_PROG_DATA */

   bool gs_present = brw->geometry_program;

   unsigned gs_size = gs_present ? brw->gs.prog_data->base.urb_entry_size : 1;

   unsigned gs_entry_size_bytes = gs_size * 64;

   /* If we're just switching between programs with the same URB requirements,

    * skip the rest of the logic.

    */

   if (!(brw->ctx.NewDriverState & BRW_NEW_CONTEXT) &&

       brw->urb.vsize == vs_size &&

       brw->urb.gs_present == gs_present &&

       brw->urb.gsize == gs_size) {

      return;

   }

   brw->urb.vsize = vs_size;

   brw->urb.gs_present = gs_present;

   brw->urb.gsize = gs_size;

   /* From p35 of the Ivy Bridge PRM (section 1.7.1: 3DSTATE_URB_GS):

    *

    *     VS Number of URB Entries must be divisible by 8 if the VS URB Entry

    *     Allocation Size is less than 9 512-bit URB entries.

    *

    * Similar text exists for GS.

    */

   unsigned vs_granularity = (vs_size < 9) ? 8 : 1;

   unsigned gs_granularity = (gs_size < 9) ? 8 : 1;

   /* URB allocations must be done in 8k chunks. */

   unsigned chunk_size_bytes = 8192;

   /* Determine the size of the URB in chunks.

    */

   unsigned urb_chunks = brw->urb.size * 1024 / chunk_size_bytes;

   /* Reserve space for push constants */

   unsigned push_constant_bytes = 1024 * push_size_kB;

   unsigned push_constant_chunks =

      push_constant_bytes / chunk_size_bytes;

   /* Initially, assign each stage the minimum amount of URB space it needs,

    * and make a note of how much additional space it "wants" (the amount of

    * additional space it could actually make use of).

    */

   /* VS has a lower limit on the number of URB entries */

   unsigned vs_chunks =

      ALIGN(brw->urb.min_vs_entries * vs_entry_size_bytes, chunk_size_bytes) /

      chunk_size_bytes;

   unsigned vs_wants =

      ALIGN(brw->urb.max_vs_entries * vs_entry_size_bytes,

            chunk_size_bytes) / chunk_size_bytes - vs_chunks;

   unsigned gs_chunks = 0;

   unsigned gs_wants = 0;

   if (gs_present) {

      /* There are two constraints on the minimum amount of URB space we can

       * allocate:

       *

       * (1) We need room for at least 2 URB entries, since we always operate

       * the GS in DUAL_OBJECT mode.

       *

       * (2) We can't allocate less than nr_gs_entries_granularity.

       */

      gs_chunks = ALIGN(MAX2(gs_granularity, 2) * gs_entry_size_bytes,

                        chunk_size_bytes) / chunk_size_bytes;

      gs_wants =

         ALIGN(brw->urb.max_gs_entries * gs_entry_size_bytes,

               chunk_size_bytes) / chunk_size_bytes - gs_chunks;

   }

   /* There should always be enough URB space to satisfy the minimum

    * requirements of each stage.

    */

   unsigned total_needs = push_constant_chunks + vs_chunks + gs_chunks;

   assert(total_needs <= urb_chunks);

   /* Mete out remaining space (if any) in proportion to "wants". */

   unsigned total_wants = vs_wants + gs_wants;

   unsigned remaining_space = urb_chunks - total_needs;

   if (remaining_space > total_wants)

      remaining_space = total_wants;

   if (remaining_space > 0) {

      unsigned vs_additional = (unsigned)

         round(vs_wants * (((double) remaining_space) / total_wants));

      vs_chunks += vs_additional;

      remaining_space -= vs_additional;

      gs_chunks += remaining_space;

   }

   /* Sanity check that we haven't over-allocated. */

   assert(push_constant_chunks + vs_chunks + gs_chunks <= urb_chunks);

   /* Finally, compute the number of entries that can fit in the space

    * allocated to each stage.

    */

   unsigned nr_vs_entries = vs_chunks * chunk_size_bytes / vs_entry_size_bytes;

   unsigned nr_gs_entries = gs_chunks * chunk_size_bytes / gs_entry_size_bytes;

   /* Since we rounded up when computing *_wants, this may be slightly more

    * than the maximum allowed amount, so correct for that.

    */

   nr_vs_entries = MIN2(nr_vs_entries, brw->urb.max_vs_entries);

   nr_gs_entries = MIN2(nr_gs_entries, brw->urb.max_gs_entries);

   /* Ensure that we program a multiple of the granularity. */

   nr_vs_entries = ROUND_DOWN_TO(nr_vs_entries, vs_granularity);

   nr_gs_entries = ROUND_DOWN_TO(nr_gs_entries, gs_granularity);

   /* Finally, sanity check to make sure we have at least the minimum number

    * of entries needed for each stage.

    */

   assert(nr_vs_entries >= brw->urb.min_vs_entries);

   if (gs_present)

      assert(nr_gs_entries >= 2);

   /* Gen7 doesn't actually use brw->urb.nr_{vs,gs}_entries, but it seems

    * better to put reasonable data in there rather than leave them

    * uninitialized.

    */

   brw->urb.nr_vs_entries = nr_vs_entries;

   brw->urb.nr_gs_entries = nr_gs_entries;

   /* Lay out the URB in the following order:

    * - push constants

    * - VS

    * - GS

    */

   brw->urb.vs_start = push_constant_chunks;

   brw->urb.gs_start = push_constant_chunks + vs_chunks;

   if (brw->gen == 7 && !brw->is_haswell && !brw->is_baytrail)

      gen7_emit_vs_workaround_flush(brw);

   gen7_emit_urb_state(brw,

                       brw->urb.nr_vs_entries, vs_size, brw->urb.vs_start,

                       brw->urb.nr_gs_entries, gs_size, brw->urb.gs_start);

}

void

gen7_emit_urb_state(struct brw_context *brw,

                    unsigned nr_vs_entries, unsigned vs_size,

                    unsigned vs_start, unsigned nr_gs_entries,

                    unsigned gs_size, unsigned gs_start)

{

   BEGIN_BATCH(8);

   OUT_BATCH(_3DSTATE_URB_VS << 16 | (2 - 2));

   OUT_BATCH(nr_vs_entries |

             ((vs_size - 1) << GEN7_URB_ENTRY_SIZE_SHIFT) |

             (vs_start << GEN7_URB_STARTING_ADDRESS_SHIFT));

   OUT_BATCH(_3DSTATE_URB_GS << 16 | (2 - 2));

   OUT_BATCH(nr_gs_entries |

             ((gs_size - 1) << GEN7_URB_ENTRY_SIZE_SHIFT) |

             (gs_start << GEN7_URB_STARTING_ADDRESS_SHIFT));

   /* Allocate the HS and DS zero space - we don't use them. */

   OUT_BATCH(_3DSTATE_URB_HS << 16 | (2 - 2));

   OUT_BATCH((0 << GEN7_URB_ENTRY_SIZE_SHIFT) |

             (vs_start << GEN7_URB_STARTING_ADDRESS_SHIFT));

   OUT_BATCH(_3DSTATE_URB_DS << 16 | (2 - 2));

   OUT_BATCH((0 << GEN7_URB_ENTRY_SIZE_SHIFT) |

             (vs_start << GEN7_URB_STARTING_ADDRESS_SHIFT));

   ADVANCE_BATCH();

}

const struct brw_tracked_state gen7_urb = {

   .dirty = {

      .mesa = 0,

      .brw = BRW_NEW_CONTEXT |

             BRW_NEW_GEOMETRY_PROGRAM |

             BRW_NEW_GS_PROG_DATA |

             BRW_NEW_VS_PROG_DATA,

   },

   .emit = gen7_upload_urb,

};