source: trunk/kernel/arch/tsar/arch-dqdt.c @ 272

/*
 * arch-dqdt.c - build the Distributed Quaternary Decision Tree
 * (see kern/dqdt.h)
 *
 * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless
 * Copyright (c) 2011,2012 UPMC Sorbonne Universites
 *
 * This file is part of ALMOS-kernel.
 *
 * ALMOS-kernel is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2.0 of the License.
 *
 * ALMOS-kernel is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with ALMOS-kernel; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <errno.h>
#include <types.h>
#include <cpu.h>
#include <bits.h>
#include <thread.h>
#include <system.h>
#include <kmem.h>
#include <arch-bib.h>
#include <boot-info.h>
#include <cluster.h>
#include <kdmsg.h>
#include <dqdt.h>

#if 0
uint_t arch_dqdt_distance(struct dqdt_cluster_s *c1, struct dqdt_cluster_s *c2, struct dqdt_attr_s *attr)
{
        register sint_t x1,y1,x2,y2,d;
  
        switch(attr->d_attr)
        {
        case DQDT_DIST_DEFAULT:
                x1 = c1->home->x_coord;
                y1 = c1->home->y_coord;
                x2 = c2->home->x_coord;
                y2 = c2->home->y_coord;
                d = ABS((x1 - x2)) + ABS((y1 - y2));
                break;

        case DQDT_DIST_RANDOM:
                //srand(cpu_time_stamp());
                d = rand() % 0xFFF;
                break;

        default:
                d = 1;
                break;
        }

        return d;
}

static uint_t __cluster_index(uint_t x, uint_t y, uint_t ymax)
{
        return x*ymax + y;
}

error_t arch_dqdt_chip_init(struct dqdt_cluster_s ***chip,
                            struct cluster_entry_s *clusters_tbl, 
                            uint_t xmax, 
                            uint_t ymax)
{
        struct dqdt_cluster_s *ptr;
        kmem_req_t req;
        uint_t chip_xmax;
        uint_t chip_ymax;
        uint_t x;
        uint_t y;
        uint_t cid;

        dqdt_dmsg(1, "%s: real (%d x %d)\n", __FUNCTION__, xmax, ymax);

        req.type  = KMEM_GENERIC;
        req.size  = sizeof(*ptr);
        chip_xmax = CONFIG_MAX_CLUSTER_ROOT;
        chip_ymax = chip_xmax;

        for(x = 0; x < chip_xmax; x++)
                for(y = 0; y < chip_ymax; y++)
                        chip[x][y] = NULL;

        req.flags = AF_BOOT | AF_REMOTE | AF_ZERO;

        for(x = 0; x < xmax; x++)
        {
                for(y = 0; y < ymax; y++)
                {
                        cid = __cluster_index(x, y, ymax);
      
                        if(clusters_tbl[cid].cluster == NULL)
                                continue;

                        req.ptr = clusters_tbl[cid].cluster;
                        ptr     = kmem_alloc(&req);

                        if(ptr == NULL) 
                                return ENOMEM;

                        ptr->cores_nr            = clusters_tbl[cid].cluster->onln_cpu_nr;
                        ptr->flags               = DQDT_CLUSTER_UP;
                        ptr->home                = clusters_tbl[cid].cluster;
                        ptr->home->levels_tbl[0] = ptr;
                        ptr->home->x_coord       = x;
                        ptr->home->y_coord       = y;
                        ptr->home->z_coord       = 0;
                        ptr->home->chip_id       = 0;
                        chip[x][y]               = ptr;

                        dqdt_dmsg(1, "%s: found cid %d, x %d, y %d, ptr %x\n", 
                                  __FUNCTION__, 
                                  cid, 
                                  x, 
                                  y, 
                                  ptr);
                }
        }

        req.flags = AF_BOOT | AF_ZERO;

        for(x = 0; x < chip_xmax; x++)
        {
                for(y = 0; y < chip_ymax; y++)
                {
                        if(chip[x][y] != NULL)
                                continue;
      
                        ptr = kmem_alloc(&req);
      
                        if(ptr == NULL) 
                                return ENOMEM;

                        chip[x][y] = ptr;
                }
        }

        return 0;
}

static struct dqdt_cluster_s *** arch_dqdt_alloc_matrix(uint_t xmax, uint_t ymax)
{
        uint_t x;
        kmem_req_t req;
        struct dqdt_cluster_s ***matrix;

        dqdt_dmsg(1, "%s: %d x %d\n", __FUNCTION__, xmax, ymax);
  
        req.type  = KMEM_GENERIC;
        req.size  = xmax * sizeof(*matrix);
        req.flags = AF_BOOT;
  
        matrix = kmem_alloc(&req);

        if(matrix == NULL)
                return NULL;
  
        for(x = 0; x < xmax; x++)
        {
                req.size  = ymax * sizeof(**matrix);
                matrix[x] = kmem_alloc(&req);

                if(matrix[x] == NULL)
                        return NULL;
        }
  
        dqdt_dmsg(1, "%s: %d x %d, done\n", __FUNCTION__, xmax, ymax);
        return matrix;
}

void arch_dqdt_free_matrix(struct dqdt_cluster_s ***matrix, uint_t xmax, uint_t ymax)
{
        uint_t x;
        kmem_req_t req;
  
        req.type = KMEM_GENERIC;
    
        for(x = 0; x < xmax; x++)
        {
                req.ptr = matrix[x];
                kmem_free(&req);
        }
  
        req.ptr = matrix;
        kmem_free(&req);
}

struct dqdt_cluster_s * arch_dqdt_make_cluster(struct dqdt_cluster_s ***matrix,
                                               uint_t level,
                                               uint_t x, 
                                               uint_t y)
{
        kmem_req_t req;
        struct cluster_s *cluster;
        struct dqdt_cluster_s *ptr;
        struct dqdt_cluster_s *child0;
        struct dqdt_cluster_s *child1;
        struct dqdt_cluster_s *child2;
        struct dqdt_cluster_s *child3;
        uint_t clstr_x;
        uint_t clstr_y;
        uint_t childs_nr;
        uint_t cores_nr;

        childs_nr = 0;
        cores_nr  = 0;  
        child0    = NULL;
        child1    = NULL;
        child2    = NULL;
        child3    = NULL;
        cluster   = NULL;
        clstr_x   = x;
        clstr_y   = y;

        dqdt_dmsg(1, "%s: level %d, x %d, y %d\n", __FUNCTION__, level, x, y);

        if(matrix[x][y]->flags & DQDT_CLUSTER_UP)
        {
                child0  = matrix[x][y];
                cluster = matrix[x][y]->home;
                clstr_x = x;
                clstr_y = y;
                childs_nr ++;
                cores_nr += child0->cores_nr;
        }

        if(matrix[x+1][y]->flags & DQDT_CLUSTER_UP) 
        {
                child1  = matrix[x+1][y];
                cluster = matrix[x+1][y]->home;
                clstr_x = x+1;
                clstr_y = y;
                childs_nr ++;
                cores_nr += child1->cores_nr;
        }
   
        if(matrix[x][y+1]->flags & DQDT_CLUSTER_UP) 
        {
                child2  = matrix[x][y+1];
                cluster = matrix[x][y+1]->home;
                clstr_x = x;
                clstr_y = y+1;
                childs_nr ++;
                cores_nr += child2->cores_nr;
        }
  
        if(matrix[x+1][y+1]->flags & DQDT_CLUSTER_UP)
        {
                child3  = matrix[x+1][y+1];
                cluster = matrix[x+1][y+1]->home;
                clstr_x = x+1;
                clstr_y = y+1;
                childs_nr ++;
                cores_nr += child3->cores_nr;
        }
  
        req.type  = KMEM_GENERIC;
        req.size  = sizeof(*ptr);
        req.flags = AF_BOOT | AF_REMOTE | AF_ZERO;
        req.ptr   = (cluster == NULL) ? current_cluster : cluster;

        ptr = kmem_alloc(&req);
  
        if(ptr == NULL) 
                return NULL;

        ptr->level = level;
        ptr->home  = matrix[clstr_x][clstr_y]->home;
        ptr->flags = matrix[clstr_x][clstr_y]->flags;

        if(cluster != NULL)
        {
                cluster->levels_tbl[level] = ptr;

                ptr->children[0] = child0;
                ptr->children[1] = child1;
                ptr->children[2] = child2;
                ptr->children[3] = child3;

                matrix[x][y]->index     = 0;
                matrix[x+1][y]->index   = 1;
                matrix[x][y+1]->index   = 2;
                matrix[x+1][y+1]->index = 3;
        }

        if(child0 == NULL)
        {
                req.ptr = matrix[x][y];
                kmem_free(&req);
        }
        else
                child0->parent = ptr;
  
        if(child1 == NULL)
        {
                req.ptr = matrix[x+1][y];
                kmem_free(&req);
        }
        else
                child1->parent = ptr;

        if(child2 == NULL)
        {
                req.ptr = matrix[x][y+1];
                kmem_free(&req);
        }
        else
                child2->parent = ptr;

        if(child3 == NULL)
        {
                req.ptr = matrix[x+1][y+1];
                kmem_free(&req);
        }
        else
                child3->parent = ptr;

        ptr->cores_nr  = cores_nr;
        ptr->childs_nr = childs_nr;
        
        dqdt_dmsg(1, "%s: level %d, x %d, y %d, childs_nr %d, cores_nr %d, isUp %s, done\n", 
                  __FUNCTION__, 
                  level, 
                  x, 
                  y,
                  cores_nr,
                  childs_nr,
                  (cluster == NULL) ? "No" : "Yes");

        return ptr;
}

error_t arch_dqdt_build(struct boot_info_s *info)
{
        struct arch_bib_header_s *header;
        struct dqdt_cluster_s ***current;
        struct dqdt_cluster_s ***next;
        uint_t xmax;
        uint_t ymax;
        uint_t level;
        uint_t x;
        uint_t y;
        error_t err;

        header = (struct arch_bib_header_s*) info->arch_info;
        xmax   = CONFIG_MAX_CLUSTER_ROOT;
        ymax   = xmax;
        level  = 1;
  
        current = arch_dqdt_alloc_matrix(xmax, ymax);

        if(current == NULL)
                return -1;
  
        err = arch_dqdt_chip_init(current, 
                                  &clusters_tbl[0], 
                                  header->x_max, 
                                  header->y_max);
  
        if(err) return err;
  
        while(xmax > 2)
        {
                dqdt_dmsg(1, "%s: current level %d, current xmax %d\n", 
                          __FUNCTION__, 
                          level, 
                          xmax);

                next = arch_dqdt_alloc_matrix(xmax/2, ymax/2);
    
                if(next == NULL)
                        return -xmax;
    
                for(x = 0; x < xmax; x += 2)
                {
                        for(y = 0; y < ymax; y += 2)
                        {
                                next[x/2][y/2] = arch_dqdt_make_cluster(current, level, x, y);

                                if(next[x/2][y/2] == NULL)
                                        return -xmax;
                        }
                }

                level ++;
                arch_dqdt_free_matrix(current, xmax, ymax);
                current = next;
                xmax = xmax/2;
                ymax = ymax/2;
        }

        dqdt_dmsg(1, "%s: making dqdt_root, level %d\n", __FUNCTION__, level);

        dqdt_root = arch_dqdt_make_cluster(current, level, 0, 0);
        arch_dqdt_free_matrix(current, xmax, ymax);
 
        return 0;
}

#endif