/*
 * Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
 *                         University Research and Technology
 *                         Corporation.  All rights reserved.
 * Copyright (c) 2004-2005 The University of Tennessee and The University
 *                         of Tennessee Research Foundation.  All rights
 *                         reserved.
 * Copyright (c) 2004-2005 High Performance Computing Center Stuttgart, 
 *                         University of Stuttgart.  All rights reserved.
 * Copyright (c) 2004-2005 The Regents of the University of California.
 *                         All rights reserved.
 * $COPYRIGHT$
 * 
 * Additional copyrights may follow
 * 
 * $HEADER$
 */


/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/

#include "ompi_config.h"
#include "ompi/constants.h"
#include "orte/util/proc_info.h"
#include "ompi/mca/pml/pml.h"
#include "ompi/mca/btl/btl.h"
#include "ompi/mca/bml/bml.h"
#include "orte/mca/ns/ns_types.h"
#include "ompi/mca/mpool/mpool.h" 
#include "pml_ob1.h"
#include "pml_ob1_rdma.h"

/*
 * Check to see if memory is registered or can be registered. Build a 
 * set of registrations on the request.
 */

size_t mca_pml_ob1_rdma_btls(
    mca_bml_base_endpoint_t* bml_endpoint,
    unsigned char* base,
    size_t size,
    mca_pml_ob1_rdma_btl_t* rdma_btls)
{
    size_t num_btls = mca_bml_base_btl_array_get_size(&bml_endpoint->btl_rdma);
    ompi_pointer_array_t regs;
    size_t num_btls_used = 0;
    size_t n;
    int rc;

    /* shortcut when there are no rdma capable btls */
    if(num_btls == 0) {
        return 0;
    }

    /* check to see if memory is registered */        
    OBJ_CONSTRUCT(&regs, ompi_pointer_array_t);
    for(n = 0; n < num_btls && num_btls_used < MCA_PML_OB1_MAX_RDMA_PER_REQUEST; n++) {

        mca_bml_base_btl_t* bml_btl = mca_bml_base_btl_array_get_index(&bml_endpoint->btl_rdma, n); 
        mca_mpool_base_registration_t* fit = NULL;
        mca_mpool_base_module_t* btl_mpool = bml_btl->btl_mpool;
        uint32_t reg_cnt;
        size_t r;
 
        /* btl is rdma capable and registration is not required */
        if(NULL == btl_mpool) {
            rdma_btls[num_btls_used].bml_btl = bml_btl;
            rdma_btls[num_btls_used].btl_reg = NULL;
            num_btls_used++;
            continue;
        }
 
        /* look through existing registrations */
        ompi_pointer_array_remove_all(&regs);
        btl_mpool->mpool_find(btl_mpool, 
                              base,
                              size,
                              &regs, 
                              &reg_cnt); 
       
        /*
         * find the best fit when there are multiple registrations
         */
        for(r = 0; r < reg_cnt; r++) { 
            mca_mpool_base_registration_t* reg  = ompi_pointer_array_get_item(&regs, r); 
            size_t reg_len = reg->bound - base + 1;

            if(reg->flags & MCA_MPOOL_FLAGS_CACHE) { 
                assert(reg->ref_count >= 3); 
            }
            if(reg->base <= base && reg_len >= size) {
                fit = reg;
            } else if(mca_pml_ob1.leave_pinned){ 
                btl_mpool->mpool_deregister(btl_mpool, reg);
            } else { 
                btl_mpool->mpool_release(btl_mpool, reg); 
            }
            
        }
        
        
        /* if the leave pinned option is set - and there is not an existing
         * registration that satisfies this request, create one.
         */
        if(NULL == fit && mca_pml_ob1.leave_pinned) {
            /* register the memory */ 
            rc = btl_mpool->mpool_register(
                                           btl_mpool, 
                                           base,
                                           size, 
                                           MCA_MPOOL_FLAGS_CACHE,
                                           &fit); 
            if(ORTE_SUCCESS != rc || NULL == fit) {
                opal_output(0, "[%s:%d] mpool_register(%p,%lu) failed, \n", __FILE__, __LINE__, base, size);
                continue;
            }
            assert(fit->ref_count == 3); 
        }

        
        if(NULL != fit) {
            rdma_btls[num_btls_used].bml_btl = bml_btl;
            rdma_btls[num_btls_used].btl_reg = fit;
            num_btls_used++;
        }
    }
    return num_btls_used;
}


/*
 * For a given btl - find the best fit registration or
 * optionally create one for leave pinned.
 */

mca_mpool_base_registration_t* mca_pml_ob1_rdma_registration(
    mca_bml_base_btl_t* bml_btl,
    unsigned char* base,
    size_t size)
{
    ompi_pointer_array_t regs;
    mca_mpool_base_registration_t* fit = NULL;
    mca_mpool_base_module_t* btl_mpool = bml_btl->btl_mpool;
    uint32_t reg_cnt;
    size_t r;
    int rc;

    /* btl is rdma capable and registration is not required */
    if(NULL == btl_mpool) {
        return NULL;
    }

    /* check to see if memory is registered */        
    OBJ_CONSTRUCT(&regs, ompi_pointer_array_t);
    ompi_pointer_array_remove_all(&regs);

    /* look through existing registrations */
    btl_mpool->mpool_find(btl_mpool, 
        base,
        size,
        &regs, 
        &reg_cnt); 

 
    /*
     * find the best fit when there are multiple registrations
     */
    for(r = 0; r < reg_cnt; r++) { 
        mca_mpool_base_registration_t* reg  = ompi_pointer_array_get_item(&regs, r); 
        size_t reg_len = reg->bound - base + 1;
        
        if(reg->flags & MCA_MPOOL_FLAGS_CACHE) { 
            assert(reg->ref_count >= 3); 
        }
        if(reg->base <= base && reg_len >= size) {
            fit = reg;
        } else if(mca_pml_ob1.leave_pinned){ 
            btl_mpool->mpool_deregister(btl_mpool, reg);
        } else { 
            btl_mpool->mpool_release(btl_mpool, reg);
        }
    }
    
        
    /* if the leave pinned option is set - and there is not an existing
     * registration that satisfies this request, create one.
     */
    if(NULL == fit && mca_pml_ob1.leave_pinned) {
        /* register the memory */ 
        rc = btl_mpool->mpool_register(
                                       btl_mpool, 
                                       base,
                                       size, 
                                       MCA_MPOOL_FLAGS_CACHE,
                                       &fit); 
        if(ORTE_SUCCESS != rc || NULL == fit) {
            opal_output(0, "[%s:%d] mpool_register(%p,%lu) failed, \n", __FILE__, __LINE__, base, size);
            return NULL;
        }
        assert(fit->ref_count == 3); 
    }
      
    OBJ_DESTRUCT(&regs);
    return fit;
}



/*
 * For a given btl - find the best fit registration or
 * optionally create one for leave pinned.
 */

mca_mpool_base_registration_t* mca_pml_ob1_rdma_register(
    mca_bml_base_btl_t* bml_btl,
    unsigned char* base,
    size_t size)
{
    ompi_pointer_array_t regs;
    mca_mpool_base_registration_t* fit = NULL;
    mca_mpool_base_module_t* btl_mpool = bml_btl->btl_mpool;
    uint32_t reg_cnt;
    size_t r;
    int rc;

    /* btl is rdma capable and registration is not required */
    if(NULL == btl_mpool) {
        return NULL;
    }

    /* check to see if memory is registered */        
    OBJ_CONSTRUCT(&regs, ompi_pointer_array_t);
    ompi_pointer_array_remove_all(&regs);

    /* look through existing registrations */
    btl_mpool->mpool_find(btl_mpool, 
        base,
        size,
        &regs, 
        &reg_cnt); 

 
    /*
     * find the best fit when there are multiple registrations
     */
    for(r = 0; r < reg_cnt; r++) { 
        mca_mpool_base_registration_t* reg  = ompi_pointer_array_get_item(&regs, r); 
        size_t reg_len = reg->bound - base + 1;
        if(reg->base <= base && reg_len >= size) {
            fit = reg;
        } else {
            btl_mpool->mpool_deregister(btl_mpool, reg);
        }
    }
    
        
    /* if the leave pinned option is set - and there is not an existing
     * registration that satisfies this request, create one.
     */
    if(NULL == fit) {
        /* register the memory */ 
        rc = btl_mpool->mpool_register(
                                       btl_mpool, 
                                       base,
                                       size, 
                                       MCA_MPOOL_FLAGS_CACHE,
                                       &fit); 
        if(ORTE_SUCCESS != rc || NULL == fit) {
            opal_output(0, "[%s:%d] mpool_register(%p,%lu) failed, \n", __FILE__, __LINE__, base, size);
            return NULL;
        }
    }
    OBJ_DESTRUCT(&regs);
    return fit;
}