/*
 * Copyright (C) 2017 Rob Clark <robclark@freedesktop.org>
 *
 * 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.
 *
 * Authors:
 *    Rob Clark <robclark@freedesktop.org>
 */

#include "util/u_inlines.h"
#include "util/u_memory.h"

#include "freedreno_context.h"
#include "freedreno_query_acc.h"
#include "freedreno_resource.h"
#include "freedreno_util.h"

static void
fd_acc_destroy_query(struct fd_context *ctx, struct fd_query *q) assert_dt
{
   struct fd_acc_query *aq = fd_acc_query(q);

   DBG("%p", q);

   pipe_resource_reference(&aq->prsc, NULL);
   list_del(&aq->node);

   free(aq->query_data);
   free(aq);
}

static void
realloc_query_bo(struct fd_context *ctx, struct fd_acc_query *aq)
{
   struct fd_resource *rsc;
   void *map;

   pipe_resource_reference(&aq->prsc, NULL);

   aq->prsc =
      pipe_buffer_create(&ctx->screen->base, PIPE_BIND_QUERY_BUFFER, 0, 0x1000);

   /* don't assume the buffer is zero-initialized: */
   rsc = fd_resource(aq->prsc);

   fd_bo_cpu_prep(rsc->bo, ctx->pipe, FD_BO_PREP_WRITE);

   map = fd_bo_map(rsc->bo);
   memset(map, 0, aq->size);
   fd_bo_cpu_fini(rsc->bo);
}

static void
fd_acc_query_pause(struct fd_acc_query *aq) assert_dt
{
   const struct fd_acc_sample_provider *p = aq->provider;

   if (!aq->batch)
      return;

   fd_batch_needs_flush(aq->batch);
   p->pause(aq, aq->batch);
   aq->batch = NULL;
}

static void
fd_acc_query_resume(struct fd_acc_query *aq, struct fd_batch *batch) assert_dt
{
   const struct fd_acc_sample_provider *p = aq->provider;

   aq->batch = batch;
   fd_batch_needs_flush(aq->batch);
   p->resume(aq, aq->batch);

   fd_screen_lock(batch->ctx->screen);
   fd_batch_resource_write(batch, fd_resource(aq->prsc));
   fd_screen_unlock(batch->ctx->screen);
}

static void
fd_acc_begin_query(struct fd_context *ctx, struct fd_query *q) assert_dt
{
   struct fd_acc_query *aq = fd_acc_query(q);

   DBG("%p", q);

   /* ->begin_query() discards previous results, so realloc bo: */
   realloc_query_bo(ctx, aq);

   /* Signal that we need to update the active queries on the next draw */
   ctx->update_active_queries = true;

   /* add to active list: */
   assert(list_is_empty(&aq->node));
   list_addtail(&aq->node, &ctx->acc_active_queries);

   /* TIMESTAMP/GPU_FINISHED and don't do normal bracketing at draw time, we
    * need to just emit the capture at this moment.
    */
   if (skip_begin_query(q->type)) {
      struct fd_batch *batch = fd_context_batch_locked(ctx);
      fd_acc_query_resume(aq, batch);
      fd_batch_unlock_submit(batch);
      fd_batch_reference(&batch, NULL);
   }
}

static void
fd_acc_end_query(struct fd_context *ctx, struct fd_query *q) assert_dt
{
   struct fd_acc_query *aq = fd_acc_query(q);

   DBG("%p", q);

   fd_acc_query_pause(aq);

   /* remove from active list: */
   list_delinit(&aq->node);
}

static bool
fd_acc_get_query_result(struct fd_context *ctx, struct fd_query *q, bool wait,
                        union pipe_query_result *result)
{
   struct fd_acc_query *aq = fd_acc_query(q);
   const struct fd_acc_sample_provider *p = aq->provider;
   struct fd_resource *rsc = fd_resource(aq->prsc);

   DBG("%p: wait=%d", q, wait);

   assert(list_is_empty(&aq->node));

   /* ARB_occlusion_query says:
    *
    *     "Querying the state for a given occlusion query forces that
    *      occlusion query to complete within a finite amount of time."
    *
    * So, regardless of whether we are supposed to wait or not, we do need to
    * flush now.
    */
   if (fd_get_query_result_in_driver_thread(q)) {
      tc_assert_driver_thread(ctx->tc);
      fd_context_access_begin(ctx);
      fd_bc_flush_writer(ctx, rsc);
      fd_context_access_end(ctx);
   }

   if (!wait) {
      int ret = fd_resource_wait(
         ctx, rsc, FD_BO_PREP_READ | FD_BO_PREP_NOSYNC | FD_BO_PREP_FLUSH);
      if (ret)
         return false;
   } else {
      fd_resource_wait(ctx, rsc, FD_BO_PREP_READ);
   }

   void *ptr = fd_bo_map(rsc->bo);
   p->result(aq, ptr, result);
   fd_bo_cpu_fini(rsc->bo);

   return true;
}

static const struct fd_query_funcs acc_query_funcs = {
   .destroy_query = fd_acc_destroy_query,
   .begin_query = fd_acc_begin_query,
   .end_query = fd_acc_end_query,
   .get_query_result = fd_acc_get_query_result,
};

struct fd_query *
fd_acc_create_query2(struct fd_context *ctx, unsigned query_type,
                     unsigned index,
                     const struct fd_acc_sample_provider *provider)
{
   struct fd_acc_query *aq;
   struct fd_query *q;

   aq = CALLOC_STRUCT(fd_acc_query);
   if (!aq)
      return NULL;

   DBG("%p: query_type=%u", aq, query_type);

   aq->provider = provider;
   aq->size = provider->size;

   list_inithead(&aq->node);

   q = &aq->base;
   q->funcs = &acc_query_funcs;
   q->type = query_type;
   q->index = index;

   return q;
}

struct fd_query *
fd_acc_create_query(struct fd_context *ctx, unsigned query_type, unsigned index)
{
   int idx = pidx(query_type);

   if ((idx < 0) || !ctx->acc_sample_providers[idx])
      return NULL;

   return fd_acc_create_query2(ctx, query_type, index,
                               ctx->acc_sample_providers[idx]);
}

/* Called at clear/draw/blit time to enable/disable the appropriate queries in
 * the batch (and transfer active querying between batches in the case of
 * batch reordering).
 */
void
fd_acc_query_update_batch(struct fd_batch *batch, bool disable_all)
{
   struct fd_context *ctx = batch->ctx;

   if (disable_all || ctx->update_active_queries) {
      struct fd_acc_query *aq;
      LIST_FOR_EACH_ENTRY (aq, &ctx->acc_active_queries, node) {
         bool batch_change = aq->batch != batch;
         bool was_active = aq->batch != NULL;
         bool now_active =
            !disable_all && (ctx->active_queries || aq->provider->always);

         if (was_active && (!now_active || batch_change))
            fd_acc_query_pause(aq);
         if (now_active && (!was_active || batch_change))
            fd_acc_query_resume(aq, batch);
      }
   }

   ctx->update_active_queries = false;
}

void
fd_acc_query_register_provider(struct pipe_context *pctx,
                               const struct fd_acc_sample_provider *provider)
{
   struct fd_context *ctx = fd_context(pctx);
   int idx = pidx(provider->query_type);

   assert((0 <= idx) && (idx < MAX_HW_SAMPLE_PROVIDERS));
   assert(!ctx->acc_sample_providers[idx]);

   ctx->acc_sample_providers[idx] = provider;
}
