/*
 * Copyright 2013 Nouveau Project
 *
 * 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 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.
 *
 * Authors: Christoph Bumiller, Samuel Pitoiset
 */

#include "nvc0/nvc0_context.h"

#include "nvc0/nvc0_compute.xml.h"

int
nvc0_screen_compute_setup(struct nvc0_screen *screen,
                          struct nouveau_pushbuf *push)
{
   struct nouveau_object *chan = screen->base.channel;
   struct nouveau_device *dev = screen->base.device;
   uint32_t obj_class;
   int ret;
   int i;

   switch (dev->chipset & ~0xf) {
   case 0xc0:
   case 0xd0:
      /* In theory, GF110+ should also support NVC8_COMPUTE_CLASS but,
       * in practice, a ILLEGAL_CLASS dmesg fail appears when using it. */
      obj_class = NVC0_COMPUTE_CLASS;
      break;
   default:
      NOUVEAU_ERR("unsupported chipset: NV%02x\n", dev->chipset);
      return -1;
   }

   ret = nouveau_object_new(chan, 0xbeef90c0, obj_class, NULL, 0,
                            &screen->compute);
   if (ret) {
      NOUVEAU_ERR("Failed to allocate compute object: %d\n", ret);
      return ret;
   }

   BEGIN_NVC0(push, SUBC_CP(NV01_SUBCHAN_OBJECT), 1);
   PUSH_DATA (push, screen->compute->oclass);

   /* hardware limit */
   BEGIN_NVC0(push, NVC0_CP(MP_LIMIT), 1);
   PUSH_DATA (push, screen->mp_count);
   BEGIN_NVC0(push, NVC0_CP(CALL_LIMIT_LOG), 1);
   PUSH_DATA (push, 0xf);

   BEGIN_NVC0(push, SUBC_CP(0x02a0), 1);
   PUSH_DATA (push, 0x8000);

   /* global memory setup */
   BEGIN_NVC0(push, SUBC_CP(0x02c4), 1);
   PUSH_DATA (push, 0);
   BEGIN_NIC0(push, NVC0_CP(GLOBAL_BASE), 0x100);
   for (i = 0; i <= 0xff; i++)
      PUSH_DATA (push, (0xc << 28) | (i << 16) | i);
   BEGIN_NVC0(push, SUBC_CP(0x02c4), 1);
   PUSH_DATA (push, 1);

   /* local memory and cstack setup */
   BEGIN_NVC0(push, NVC0_CP(TEMP_ADDRESS_HIGH), 2);
   PUSH_DATAh(push, screen->tls->offset);
   PUSH_DATA (push, screen->tls->offset);
   BEGIN_NVC0(push, NVC0_CP(TEMP_SIZE_HIGH), 2);
   PUSH_DATAh(push, screen->tls->size);
   PUSH_DATA (push, screen->tls->size);
   BEGIN_NVC0(push, NVC0_CP(WARP_TEMP_ALLOC), 1);
   PUSH_DATA (push, 0);
   BEGIN_NVC0(push, NVC0_CP(LOCAL_BASE), 1);
   PUSH_DATA (push, 0xff << 24);

   /* shared memory setup */
   BEGIN_NVC0(push, NVC0_CP(CACHE_SPLIT), 1);
   PUSH_DATA (push, NVC0_COMPUTE_CACHE_SPLIT_48K_SHARED_16K_L1);
   BEGIN_NVC0(push, NVC0_CP(SHARED_BASE), 1);
   PUSH_DATA (push, 0xfe << 24);
   BEGIN_NVC0(push, NVC0_CP(SHARED_SIZE), 1);
   PUSH_DATA (push, 0);

   /* code segment setup */
   BEGIN_NVC0(push, NVC0_CP(CODE_ADDRESS_HIGH), 2);
   PUSH_DATAh(push, screen->text->offset);
   PUSH_DATA (push, screen->text->offset);

   /* textures */
   BEGIN_NVC0(push, NVC0_CP(TIC_ADDRESS_HIGH), 3);
   PUSH_DATAh(push, screen->txc->offset);
   PUSH_DATA (push, screen->txc->offset);
   PUSH_DATA (push, NVC0_TIC_MAX_ENTRIES - 1);

   /* samplers */
   BEGIN_NVC0(push, NVC0_CP(TSC_ADDRESS_HIGH), 3);
   PUSH_DATAh(push, screen->txc->offset + 65536);
   PUSH_DATA (push, screen->txc->offset + 65536);
   PUSH_DATA (push, NVC0_TSC_MAX_ENTRIES - 1);

   /* MS sample coordinate offsets */
   BEGIN_NVC0(push, NVC0_CP(CB_SIZE), 3);
   PUSH_DATA (push, NVC0_CB_AUX_SIZE);
   PUSH_DATAh(push, screen->uniform_bo->offset + NVC0_CB_AUX_INFO(5));
   PUSH_DATA (push, screen->uniform_bo->offset + NVC0_CB_AUX_INFO(5));
   BEGIN_1IC0(push, NVC0_CP(CB_POS), 1 + 2 * 8);
   PUSH_DATA (push, NVC0_CB_AUX_MS_INFO);
   PUSH_DATA (push, 0); /* 0 */
   PUSH_DATA (push, 0);
   PUSH_DATA (push, 1); /* 1 */
   PUSH_DATA (push, 0);
   PUSH_DATA (push, 0); /* 2 */
   PUSH_DATA (push, 1);
   PUSH_DATA (push, 1); /* 3 */
   PUSH_DATA (push, 1);
   PUSH_DATA (push, 2); /* 4 */
   PUSH_DATA (push, 0);
   PUSH_DATA (push, 3); /* 5 */
   PUSH_DATA (push, 0);
   PUSH_DATA (push, 2); /* 6 */
   PUSH_DATA (push, 1);
   PUSH_DATA (push, 3); /* 7 */
   PUSH_DATA (push, 1);

   return 0;
}

static void
nvc0_compute_validate_samplers(struct nvc0_context *nvc0)
{
   bool need_flush = nvc0_validate_tsc(nvc0, 5);
   if (need_flush) {
      BEGIN_NVC0(nvc0->base.pushbuf, NVC0_CP(TSC_FLUSH), 1);
      PUSH_DATA (nvc0->base.pushbuf, 0);
   }

   /* Invalidate all 3D samplers because they are aliased. */
   for (int s = 0; s < 5; s++)
      nvc0->samplers_dirty[s] = ~0;
   nvc0->dirty_3d |= NVC0_NEW_3D_SAMPLERS;
}

static void
nvc0_compute_validate_textures(struct nvc0_context *nvc0)
{
   bool need_flush = nvc0_validate_tic(nvc0, 5);
   if (need_flush) {
      BEGIN_NVC0(nvc0->base.pushbuf, NVC0_CP(TIC_FLUSH), 1);
      PUSH_DATA (nvc0->base.pushbuf, 0);
   }

   /* Invalidate all 3D textures because they are aliased. */
   for (int s = 0; s < 5; s++) {
      for (int i = 0; i < nvc0->num_textures[s]; i++)
         nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_TEX(s, i));
      nvc0->textures_dirty[s] = ~0;
   }
   nvc0->dirty_3d |= NVC0_NEW_3D_TEXTURES;
}

static inline void
nvc0_compute_invalidate_constbufs(struct nvc0_context *nvc0)
{
   int s;

   /* Invalidate all 3D constbufs because they are aliased with COMPUTE. */
   for (s = 0; s < 5; s++) {
      nvc0->constbuf_dirty[s] |= nvc0->constbuf_valid[s];
      nvc0->state.uniform_buffer_bound[s] = 0;
   }
   nvc0->dirty_3d |= NVC0_NEW_3D_CONSTBUF;
}

static void
nvc0_compute_validate_constbufs(struct nvc0_context *nvc0)
{
   struct nouveau_pushbuf *push = nvc0->base.pushbuf;
   const int s = 5;

   while (nvc0->constbuf_dirty[s]) {
      int i = ffs(nvc0->constbuf_dirty[s]) - 1;
      nvc0->constbuf_dirty[s] &= ~(1 << i);

      if (nvc0->constbuf[s][i].user) {
         struct nouveau_bo *bo = nvc0->screen->uniform_bo;
         const unsigned base = NVC0_CB_USR_INFO(s);
         const unsigned size = nvc0->constbuf[s][0].size;
         assert(i == 0); /* we really only want OpenGL uniforms here */
         assert(nvc0->constbuf[s][0].u.data);

         if (nvc0->state.uniform_buffer_bound[s] < size) {
            nvc0->state.uniform_buffer_bound[s] = align(size, 0x100);

            BEGIN_NVC0(push, NVC0_CP(CB_SIZE), 3);
            PUSH_DATA (push, nvc0->state.uniform_buffer_bound[s]);
            PUSH_DATAh(push, bo->offset + base);
            PUSH_DATA (push, bo->offset + base);
            BEGIN_NVC0(push, NVC0_CP(CB_BIND), 1);
            PUSH_DATA (push, (0 << 8) | 1);
         }
         nvc0_cb_bo_push(&nvc0->base, bo, NV_VRAM_DOMAIN(&nvc0->screen->base),
                         base, nvc0->state.uniform_buffer_bound[s],
                         0, (size + 3) / 4,
                         nvc0->constbuf[s][0].u.data);
      } else {
         struct nv04_resource *res =
            nv04_resource(nvc0->constbuf[s][i].u.buf);
         if (res) {
            BEGIN_NVC0(push, NVC0_CP(CB_SIZE), 3);
            PUSH_DATA (push, nvc0->constbuf[s][i].size);
            PUSH_DATAh(push, res->address + nvc0->constbuf[s][i].offset);
            PUSH_DATA (push, res->address + nvc0->constbuf[s][i].offset);
            BEGIN_NVC0(push, NVC0_CP(CB_BIND), 1);
            PUSH_DATA (push, (i << 8) | 1);

            BCTX_REFN(nvc0->bufctx_cp, CP_CB(i), res, RD);

            res->cb_bindings[s] |= 1 << i;
         } else {
            BEGIN_NVC0(push, NVC0_CP(CB_BIND), 1);
            PUSH_DATA (push, (i << 8) | 0);
         }
         if (i == 0)
            nvc0->state.uniform_buffer_bound[s] = 0;
      }
   }

   nvc0_compute_invalidate_constbufs(nvc0);

   BEGIN_NVC0(push, NVC0_CP(FLUSH), 1);
   PUSH_DATA (push, NVC0_COMPUTE_FLUSH_CB);
}

static void
nvc0_compute_validate_driverconst(struct nvc0_context *nvc0)
{
   struct nouveau_pushbuf *push = nvc0->base.pushbuf;
   struct nvc0_screen *screen = nvc0->screen;

   BEGIN_NVC0(push, NVC0_CP(CB_SIZE), 3);
   PUSH_DATA (push, NVC0_CB_AUX_SIZE);
   PUSH_DATAh(push, screen->uniform_bo->offset + NVC0_CB_AUX_INFO(5));
   PUSH_DATA (push, screen->uniform_bo->offset + NVC0_CB_AUX_INFO(5));
   BEGIN_NVC0(push, NVC0_CP(CB_BIND), 1);
   PUSH_DATA (push, (15 << 8) | 1);

   nvc0->dirty_3d |= NVC0_NEW_3D_DRIVERCONST;
}

static void
nvc0_compute_validate_buffers(struct nvc0_context *nvc0)
{
   struct nouveau_pushbuf *push = nvc0->base.pushbuf;
   struct nvc0_screen *screen = nvc0->screen;
   const int s = 5;
   int i;

   BEGIN_NVC0(push, NVC0_CP(CB_SIZE), 3);
   PUSH_DATA (push, NVC0_CB_AUX_SIZE);
   PUSH_DATAh(push, screen->uniform_bo->offset + NVC0_CB_AUX_INFO(s));
   PUSH_DATA (push, screen->uniform_bo->offset + NVC0_CB_AUX_INFO(s));
   BEGIN_1IC0(push, NVC0_CP(CB_POS), 1 + 4 * NVC0_MAX_BUFFERS);
   PUSH_DATA (push, NVC0_CB_AUX_BUF_INFO(0));

   for (i = 0; i < NVC0_MAX_BUFFERS; i++) {
      if (nvc0->buffers[s][i].buffer) {
         struct nv04_resource *res =
            nv04_resource(nvc0->buffers[s][i].buffer);
         PUSH_DATA (push, res->address + nvc0->buffers[s][i].buffer_offset);
         PUSH_DATAh(push, res->address + nvc0->buffers[s][i].buffer_offset);
         PUSH_DATA (push, nvc0->buffers[s][i].buffer_size);
         PUSH_DATA (push, 0);
         BCTX_REFN(nvc0->bufctx_cp, CP_BUF, res, RDWR);
         util_range_add(&res->valid_buffer_range,
                        nvc0->buffers[s][i].buffer_offset,
                        nvc0->buffers[s][i].buffer_offset +
                        nvc0->buffers[s][i].buffer_size);
      } else {
         PUSH_DATA (push, 0);
         PUSH_DATA (push, 0);
         PUSH_DATA (push, 0);
         PUSH_DATA (push, 0);
      }
   }
}

void
nvc0_compute_validate_globals(struct nvc0_context *nvc0)
{
   unsigned i;

   for (i = 0; i < nvc0->global_residents.size / sizeof(struct pipe_resource *);
        ++i) {
      struct pipe_resource *res = *util_dynarray_element(
         &nvc0->global_residents, struct pipe_resource *, i);
      if (res)
         nvc0_add_resident(nvc0->bufctx_cp, NVC0_BIND_CP_GLOBAL,
                           nv04_resource(res), NOUVEAU_BO_RDWR);
   }
}

static inline void
nvc0_compute_invalidate_surfaces(struct nvc0_context *nvc0, const int s)
{
   struct nouveau_pushbuf *push = nvc0->base.pushbuf;
   int i;

   for (i = 0; i < NVC0_MAX_IMAGES; ++i) {
      if (s == 5)
         BEGIN_NVC0(push, NVC0_CP(IMAGE(i)), 6);
      else
         BEGIN_NVC0(push, NVC0_3D(IMAGE(i)), 6);
      PUSH_DATA(push, 0);
      PUSH_DATA(push, 0);
      PUSH_DATA(push, 0);
      PUSH_DATA(push, 0);
      PUSH_DATA(push, 0x14000);
      PUSH_DATA(push, 0);
   }
}

static void
nvc0_compute_validate_surfaces(struct nvc0_context *nvc0)
{
   /* TODO: Invalidating both 3D and CP surfaces before validating surfaces for
    * compute is probably not really necessary, but we didn't find any better
    * solutions for now. This fixes some invalidation issues when compute and
    * fragment shaders are used inside the same context. Anyway, we definitely
    * have invalidation issues between 3D and CP for other resources like SSBO
    * and atomic counters. */
   nvc0_compute_invalidate_surfaces(nvc0, 4);
   nvc0_compute_invalidate_surfaces(nvc0, 5);

   nvc0_validate_suf(nvc0, 5);

   /* Invalidate all FRAGMENT images because they are aliased with COMPUTE. */
   nouveau_bufctx_reset(nvc0->bufctx_3d, NVC0_BIND_3D_SUF);
   nvc0->dirty_3d |= NVC0_NEW_3D_SURFACES;
   nvc0->images_dirty[4] |= nvc0->images_valid[4];
}

static struct nvc0_state_validate
validate_list_cp[] = {
   { nvc0_compprog_validate,              NVC0_NEW_CP_PROGRAM     },
   { nvc0_compute_validate_constbufs,     NVC0_NEW_CP_CONSTBUF    },
   { nvc0_compute_validate_driverconst,   NVC0_NEW_CP_DRIVERCONST },
   { nvc0_compute_validate_buffers,       NVC0_NEW_CP_BUFFERS     },
   { nvc0_compute_validate_textures,      NVC0_NEW_CP_TEXTURES    },
   { nvc0_compute_validate_samplers,      NVC0_NEW_CP_SAMPLERS    },
   { nvc0_compute_validate_globals,       NVC0_NEW_CP_GLOBALS     },
   { nvc0_compute_validate_surfaces,      NVC0_NEW_CP_SURFACES    },
};

static bool
nvc0_state_validate_cp(struct nvc0_context *nvc0, uint32_t mask)
{
   bool ret;

   ret = nvc0_state_validate(nvc0, mask, validate_list_cp,
                             ARRAY_SIZE(validate_list_cp), &nvc0->dirty_cp,
                             nvc0->bufctx_cp);

   if (unlikely(nvc0->state.flushed))
      nvc0_bufctx_fence(nvc0, nvc0->bufctx_cp, true);
   return ret;
}

static void
nvc0_compute_upload_input(struct nvc0_context *nvc0,
                          const struct pipe_grid_info *info)
{
   struct nouveau_pushbuf *push = nvc0->base.pushbuf;
   struct nvc0_screen *screen = nvc0->screen;
   struct nvc0_program *cp = nvc0->compprog;

   if (cp->parm_size) {
      struct nouveau_bo *bo = screen->uniform_bo;
      const unsigned base = NVC0_CB_USR_INFO(5);

      BEGIN_NVC0(push, NVC0_CP(CB_SIZE), 3);
      PUSH_DATA (push, align(cp->parm_size, 0x100));
      PUSH_DATAh(push, bo->offset + base);
      PUSH_DATA (push, bo->offset + base);
      BEGIN_NVC0(push, NVC0_CP(CB_BIND), 1);
      PUSH_DATA (push, (0 << 8) | 1);
      /* NOTE: size is limited to 4 KiB, which is < NV04_PFIFO_MAX_PACKET_LEN */
      BEGIN_1IC0(push, NVC0_CP(CB_POS), 1 + cp->parm_size / 4);
      PUSH_DATA (push, 0);
      PUSH_DATAp(push, info->input, cp->parm_size / 4);

      nvc0_compute_invalidate_constbufs(nvc0);
   }

   BEGIN_NVC0(push, NVC0_CP(CB_SIZE), 3);
   PUSH_DATA (push, NVC0_CB_AUX_SIZE);
   PUSH_DATAh(push, screen->uniform_bo->offset + NVC0_CB_AUX_INFO(5));
   PUSH_DATA (push, screen->uniform_bo->offset + NVC0_CB_AUX_INFO(5));

   BEGIN_1IC0(push, NVC0_CP(CB_POS), 1 + 1);
   /* (7) as we only upload work_dim on nvc0, the rest uses special regs */
   PUSH_DATA (push, NVC0_CB_AUX_GRID_INFO(7));
   PUSH_DATA (push, info->work_dim);

   BEGIN_NVC0(push, NVC0_CP(FLUSH), 1);
   PUSH_DATA (push, NVC0_COMPUTE_FLUSH_CB);
}

void
nvc0_launch_grid(struct pipe_context *pipe, const struct pipe_grid_info *info)
{
   struct nvc0_context *nvc0 = nvc0_context(pipe);
   struct nvc0_screen *screen = nvc0->screen;
   struct nouveau_pushbuf *push = nvc0->base.pushbuf;
   struct nvc0_program *cp = nvc0->compprog;
   int ret;

   pipe_mutex_lock(screen->base.push_mutex);

   ret = !nvc0_state_validate_cp(nvc0, ~0);
   if (ret) {
      NOUVEAU_ERR("Failed to launch grid !\n");
      pipe_mutex_unlock(screen->base.push_mutex);
      return;
   }

   nvc0_compute_upload_input(nvc0, info);

   BEGIN_NVC0(push, NVC0_CP(CP_START_ID), 1);
   PUSH_DATA (push, nvc0_program_symbol_offset(cp, info->pc));

   BEGIN_NVC0(push, NVC0_CP(LOCAL_POS_ALLOC), 3);
   PUSH_DATA (push, (cp->hdr[1] & 0xfffff0) + align(cp->cp.lmem_size, 0x10));
   PUSH_DATA (push, 0);
   PUSH_DATA (push, 0x800); /* WARP_CSTACK_SIZE */

   BEGIN_NVC0(push, NVC0_CP(SHARED_SIZE), 3);
   PUSH_DATA (push, align(cp->cp.smem_size, 0x100));
   PUSH_DATA (push, info->block[0] * info->block[1] * info->block[2]);
   PUSH_DATA (push, cp->num_barriers);
   BEGIN_NVC0(push, NVC0_CP(CP_GPR_ALLOC), 1);
   PUSH_DATA (push, cp->num_gprs);

   /* launch preliminary setup */
   BEGIN_NVC0(push, NVC0_CP(GRIDID), 1);
   PUSH_DATA (push, 0x1);
   BEGIN_NVC0(push, SUBC_CP(0x036c), 1);
   PUSH_DATA (push, 0);
   BEGIN_NVC0(push, NVC0_CP(FLUSH), 1);
   PUSH_DATA (push, NVC0_COMPUTE_FLUSH_GLOBAL | NVC0_COMPUTE_FLUSH_UNK8);

   /* block setup */
   BEGIN_NVC0(push, NVC0_CP(BLOCKDIM_YX), 2);
   PUSH_DATA (push, (info->block[1] << 16) | info->block[0]);
   PUSH_DATA (push, info->block[2]);

   if (unlikely(info->indirect)) {
      struct nv04_resource *res = nv04_resource(info->indirect);
      uint32_t offset = res->offset + info->indirect_offset;
      unsigned macro = NVC0_CP_MACRO_LAUNCH_GRID_INDIRECT;

      nouveau_pushbuf_space(push, 16, 0, 1);
      PUSH_REFN(push, res->bo, NOUVEAU_BO_RD | res->domain);
      PUSH_DATA(push, NVC0_FIFO_PKHDR_1I(1, macro, 3));
      nouveau_pushbuf_data(push, res->bo, offset,
                           NVC0_IB_ENTRY_1_NO_PREFETCH | 3 * 4);
   } else {
      /* grid setup */
      BEGIN_NVC0(push, NVC0_CP(GRIDDIM_YX), 2);
      PUSH_DATA (push, (info->grid[1] << 16) | info->grid[0]);
      PUSH_DATA (push, info->grid[2]);

      /* kernel launching */
      BEGIN_NVC0(push, NVC0_CP(COMPUTE_BEGIN), 1);
      PUSH_DATA (push, 0);
      BEGIN_NVC0(push, SUBC_CP(0x0a08), 1);
      PUSH_DATA (push, 0);
      BEGIN_NVC0(push, NVC0_CP(LAUNCH), 1);
      PUSH_DATA (push, 0x1000);
      BEGIN_NVC0(push, NVC0_CP(COMPUTE_END), 1);
      PUSH_DATA (push, 0);
      BEGIN_NVC0(push, SUBC_CP(0x0360), 1);
      PUSH_DATA (push, 0x1);
   }

   /* TODO: Not sure if this is really necessary. */
   nvc0_compute_invalidate_surfaces(nvc0, 5);
   nouveau_bufctx_reset(nvc0->bufctx_cp, NVC0_BIND_CP_SUF);
   nvc0->dirty_cp |= NVC0_NEW_CP_SURFACES;
   nvc0->images_dirty[5] |= nvc0->images_valid[5];

   pipe_mutex_unlock(screen->base.push_mutex);
}