/*
 * Copyright © 2016 Red Hat.
 * Copyright © 2016 Bas Nieuwenhuizen
 * based on amdgpu winsys.
 * Copyright © 2011 Marek Olšák <maraeo@gmail.com>
 * Copyright © 2015 Advanced Micro Devices, Inc.
 *
 * 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 "radv_amdgpu_winsys.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "drm-uapi/amdgpu_drm.h"
#include "ac_surface.h"
#include "radv_amdgpu_bo.h"
#include "radv_amdgpu_cs.h"
#include "radv_amdgpu_surface.h"
#include "radv_amdgpu_winsys_public.h"
#include "radv_debug.h"
#include "xf86drm.h"

static bool
do_winsys_init(struct radv_amdgpu_winsys *ws, int fd)
{
   if (!ac_query_gpu_info(fd, ws->dev, &ws->info, &ws->amdinfo))
      return false;

   if (ws->info.drm_minor < 23) {
      fprintf(stderr, "radv: DRM 3.23+ is required (Linux kernel 4.15+)\n");
      return false;
   }

   ws->addrlib = ac_addrlib_create(&ws->info, &ws->info.max_alignment);
   if (!ws->addrlib) {
      fprintf(stderr, "amdgpu: Cannot create addrlib.\n");
      return false;
   }

   ws->info.num_rings[RING_DMA] = MIN2(ws->info.num_rings[RING_DMA], MAX_RINGS_PER_TYPE);
   ws->info.num_rings[RING_COMPUTE] = MIN2(ws->info.num_rings[RING_COMPUTE], MAX_RINGS_PER_TYPE);

   ws->use_ib_bos = ws->info.chip_class >= GFX7;
   return true;
}

static void
radv_amdgpu_winsys_query_info(struct radeon_winsys *rws, struct radeon_info *info)
{
   *info = ((struct radv_amdgpu_winsys *)rws)->info;
}

static uint64_t
radv_amdgpu_winsys_query_value(struct radeon_winsys *rws, enum radeon_value_id value)
{
   struct radv_amdgpu_winsys *ws = (struct radv_amdgpu_winsys *)rws;
   struct amdgpu_heap_info heap;
   uint64_t retval = 0;

   switch (value) {
   case RADEON_ALLOCATED_VRAM:
      return ws->allocated_vram;
   case RADEON_ALLOCATED_VRAM_VIS:
      return ws->allocated_vram_vis;
   case RADEON_ALLOCATED_GTT:
      return ws->allocated_gtt;
   case RADEON_TIMESTAMP:
      amdgpu_query_info(ws->dev, AMDGPU_INFO_TIMESTAMP, 8, &retval);
      return retval;
   case RADEON_NUM_BYTES_MOVED:
      amdgpu_query_info(ws->dev, AMDGPU_INFO_NUM_BYTES_MOVED, 8, &retval);
      return retval;
   case RADEON_NUM_EVICTIONS:
      amdgpu_query_info(ws->dev, AMDGPU_INFO_NUM_EVICTIONS, 8, &retval);
      return retval;
   case RADEON_NUM_VRAM_CPU_PAGE_FAULTS:
      amdgpu_query_info(ws->dev, AMDGPU_INFO_NUM_VRAM_CPU_PAGE_FAULTS, 8, &retval);
      return retval;
   case RADEON_VRAM_USAGE:
      amdgpu_query_heap_info(ws->dev, AMDGPU_GEM_DOMAIN_VRAM, 0, &heap);
      return heap.heap_usage;
   case RADEON_VRAM_VIS_USAGE:
      amdgpu_query_heap_info(ws->dev, AMDGPU_GEM_DOMAIN_VRAM, AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED,
                             &heap);
      return heap.heap_usage;
   case RADEON_GTT_USAGE:
      amdgpu_query_heap_info(ws->dev, AMDGPU_GEM_DOMAIN_GTT, 0, &heap);
      return heap.heap_usage;
   case RADEON_GPU_TEMPERATURE:
      amdgpu_query_sensor_info(ws->dev, AMDGPU_INFO_SENSOR_GPU_TEMP, 4, &retval);
      return retval;
   case RADEON_CURRENT_SCLK:
      amdgpu_query_sensor_info(ws->dev, AMDGPU_INFO_SENSOR_GFX_SCLK, 4, &retval);
      return retval;
   case RADEON_CURRENT_MCLK:
      amdgpu_query_sensor_info(ws->dev, AMDGPU_INFO_SENSOR_GFX_MCLK, 4, &retval);
      return retval;
   default:
      unreachable("invalid query value");
   }

   return 0;
}

static bool
radv_amdgpu_winsys_read_registers(struct radeon_winsys *rws, unsigned reg_offset,
                                  unsigned num_registers, uint32_t *out)
{
   struct radv_amdgpu_winsys *ws = (struct radv_amdgpu_winsys *)rws;

   return amdgpu_read_mm_registers(ws->dev, reg_offset / 4, num_registers, 0xffffffff, 0, out) == 0;
}

static const char *
radv_amdgpu_winsys_get_chip_name(struct radeon_winsys *rws)
{
   amdgpu_device_handle dev = ((struct radv_amdgpu_winsys *)rws)->dev;

   return amdgpu_get_marketing_name(dev);
}

static simple_mtx_t winsys_creation_mutex = _SIMPLE_MTX_INITIALIZER_NP;
static struct hash_table *winsyses = NULL;

static void
radv_amdgpu_winsys_destroy(struct radeon_winsys *rws)
{
   struct radv_amdgpu_winsys *ws = (struct radv_amdgpu_winsys *)rws;
   bool destroy = false;

   simple_mtx_lock(&winsys_creation_mutex);
   if (!--ws->refcount) {
      _mesa_hash_table_remove_key(winsyses, ws->dev);

      /* Clean the hashtable up if empty, though there is no
       * empty function. */
      if (_mesa_hash_table_num_entries(winsyses) == 0) {
         _mesa_hash_table_destroy(winsyses, NULL);
         winsyses = NULL;
      }

      destroy = true;
   }
   simple_mtx_unlock(&winsys_creation_mutex);
   if (!destroy)
      return;

   for (unsigned i = 0; i < ws->syncobj_count; ++i)
      amdgpu_cs_destroy_syncobj(ws->dev, ws->syncobj[i]);
   free(ws->syncobj);

   u_rwlock_destroy(&ws->global_bo_list.lock);
   free(ws->global_bo_list.bos);

   if (ws->reserve_vmid)
      amdgpu_vm_unreserve_vmid(ws->dev, 0);

   pthread_mutex_destroy(&ws->syncobj_lock);
   u_rwlock_destroy(&ws->log_bo_list_lock);
   ac_addrlib_destroy(ws->addrlib);
   amdgpu_device_deinitialize(ws->dev);
   FREE(rws);
}

struct radeon_winsys *
radv_amdgpu_winsys_create(int fd, uint64_t debug_flags, uint64_t perftest_flags, bool reserve_vmid)
{
   uint32_t drm_major, drm_minor, r;
   amdgpu_device_handle dev;
   struct radv_amdgpu_winsys *ws = NULL;

   r = amdgpu_device_initialize(fd, &drm_major, &drm_minor, &dev);
   if (r)
      return NULL;

   /* We have to keep this lock till insertion. */
   simple_mtx_lock(&winsys_creation_mutex);
   if (!winsyses)
      winsyses = _mesa_pointer_hash_table_create(NULL);
   if (!winsyses)
      goto fail;

   struct hash_entry *entry = _mesa_hash_table_search(winsyses, dev);
   if (entry) {
      ws = (struct radv_amdgpu_winsys *)entry->data;
      ++ws->refcount;
   }

   if (ws) {
      simple_mtx_unlock(&winsys_creation_mutex);
      amdgpu_device_deinitialize(dev);

      /* Check that options don't differ from the existing winsys. */
      if (((debug_flags & RADV_DEBUG_ALL_BOS) && !ws->debug_all_bos) ||
          ((debug_flags & RADV_DEBUG_HANG) && !ws->debug_log_bos) ||
          ((debug_flags & RADV_DEBUG_NO_IBS) && ws->use_ib_bos) ||
          (perftest_flags != ws->perftest)) {
         fprintf(stderr, "amdgpu: Found options that differ from the existing winsys.\n");
         return NULL;
      }

      /* RADV_DEBUG_ZERO_VRAM is the only option that is allowed to be set again. */
      if (debug_flags & RADV_DEBUG_ZERO_VRAM)
         ws->zero_all_vram_allocs = true;

      return &ws->base;
   }

   ws = calloc(1, sizeof(struct radv_amdgpu_winsys));
   if (!ws)
      goto fail;

   ws->refcount = 1;
   ws->dev = dev;
   ws->info.drm_major = drm_major;
   ws->info.drm_minor = drm_minor;
   if (!do_winsys_init(ws, fd))
      goto winsys_fail;

   ws->debug_all_bos = !!(debug_flags & RADV_DEBUG_ALL_BOS);
   ws->debug_log_bos = debug_flags & RADV_DEBUG_HANG;
   if (debug_flags & RADV_DEBUG_NO_IBS)
      ws->use_ib_bos = false;

   ws->reserve_vmid = reserve_vmid;
   if (ws->reserve_vmid) {
      r = amdgpu_vm_reserve_vmid(dev, 0);
      if (r)
         goto vmid_fail;
   }

   ws->perftest = perftest_flags;
   ws->zero_all_vram_allocs = debug_flags & RADV_DEBUG_ZERO_VRAM;
   u_rwlock_init(&ws->global_bo_list.lock);
   list_inithead(&ws->log_bo_list);
   u_rwlock_init(&ws->log_bo_list_lock);
   pthread_mutex_init(&ws->syncobj_lock, NULL);
   ws->base.query_info = radv_amdgpu_winsys_query_info;
   ws->base.query_value = radv_amdgpu_winsys_query_value;
   ws->base.read_registers = radv_amdgpu_winsys_read_registers;
   ws->base.get_chip_name = radv_amdgpu_winsys_get_chip_name;
   ws->base.destroy = radv_amdgpu_winsys_destroy;
   radv_amdgpu_bo_init_functions(ws);
   radv_amdgpu_cs_init_functions(ws);
   radv_amdgpu_surface_init_functions(ws);

   _mesa_hash_table_insert(winsyses, dev, ws);
   simple_mtx_unlock(&winsys_creation_mutex);

   return &ws->base;

vmid_fail:
   ac_addrlib_destroy(ws->addrlib);
winsys_fail:
   free(ws);
fail:
   if (winsyses && _mesa_hash_table_num_entries(winsyses) == 0) {
      _mesa_hash_table_destroy(winsyses, NULL);
      winsyses = NULL;
   }
   simple_mtx_unlock(&winsys_creation_mutex);
   amdgpu_device_deinitialize(dev);
   return NULL;
}