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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/types.h>
#include <sys/sysmacros.h>
#include <sys/cmn_err.h>
#include <sys/errno.h>
#include <sys/kmem.h>
#include <sys/ksynch.h>
#include <sys/stream.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/vio_util.h>
/*
* Create a pool of mblks from which future vio_allocb() requests
* will be serviced.
*
* NOTE: num_mblks has to non-zero and a power-of-2
*
* Returns 0 on success or EINVAL if num_mblks is zero or not
* a power of 2.
*/
int
vio_create_mblks(uint64_t num_mblks, size_t mblk_size, vio_mblk_pool_t **poolp)
{
vio_mblk_pool_t *vmplp;
vio_mblk_t *vmp;
uint8_t *datap;
int i;
if (!(num_mblks) || (!ISP2(num_mblks))) {
*poolp = 0;
return (EINVAL);
}
vmplp = kmem_zalloc(sizeof (*vmplp), KM_SLEEP);
vmplp->quelen = num_mblks;
vmplp->quemask = num_mblks - 1; /* expects quelen is power-of-2 */
vmplp->mblk_size = mblk_size;
mutex_init(&vmplp->hlock, NULL, MUTEX_DRIVER,
DDI_INTR_PRI(DDI_INTR_SOFTPRI_DEFAULT));
mutex_init(&vmplp->tlock, NULL, MUTEX_DRIVER,
DDI_INTR_PRI(DDI_INTR_SOFTPRI_DEFAULT));
vmplp->basep = kmem_zalloc(num_mblks * sizeof (vio_mblk_t), KM_SLEEP);
vmplp->datap = kmem_zalloc(num_mblks * mblk_size, KM_SLEEP);
vmplp->nextp = NULL;
/* create a queue of pointers to free vio_mblk_t's */
vmplp->quep = kmem_zalloc(vmplp->quelen * sizeof (vio_mblk_t *),
KM_SLEEP);
vmplp->head = 0;
vmplp->tail = 0;
for (i = 0, datap = vmplp->datap; i < num_mblks; i++) {
vmp = &(vmplp->basep[i]);
vmp->vmplp = vmplp;
vmp->datap = datap;
vmp->reclaim.free_func = vio_freeb;
vmp->reclaim.free_arg = (caddr_t)vmp;
vmp->mp = desballoc(vmp->datap, mblk_size, BPRI_MED,
&vmp->reclaim);
if (vmp->mp == NULL)
continue;
/* put this vmp on the free stack */
vmplp->quep[vmplp->tail] = vmp;
vmplp->tail = (vmplp->tail + 1) & vmplp->quemask;
datap += mblk_size;
}
*poolp = vmplp;
return (0);
}
/*
* Destroy the pool of mblks. This can only succeed when
* all allocated mblks have been returned to the pool.
*
* It is up to the caller to ensure that no further mblks are
* requested from the pool after destroy has been invoked.
*
* Returns 0 on success, EINVAL if handle is invalid, or
* EBUSY if not all mblks reclaimed yet.
*/
int
vio_destroy_mblks(vio_mblk_pool_t *vmplp)
{
if (vmplp == NULL)
return (EINVAL);
/*
* We can only destroy the pool once all the mblks have
* been reclaimed.
*/
if (vmplp->head != vmplp->tail) {
/* some mblks still in use */
return (EBUSY);
}
kmem_free(vmplp->basep, vmplp->quelen * sizeof (vio_mblk_t));
kmem_free(vmplp->datap, vmplp->quelen * vmplp->mblk_size);
kmem_free(vmplp->quep, vmplp->quelen * sizeof (vio_mblk_t *));
mutex_destroy(&vmplp->hlock);
mutex_destroy(&vmplp->tlock);
kmem_free(vmplp, sizeof (*vmplp));
return (0);
}
/*
* Allocate a mblk from the free pool if one is available.
* Otherwise returns NULL.
*/
mblk_t *
vio_allocb(vio_mblk_pool_t *vmplp)
{
vio_mblk_t *vmp = NULL;
mblk_t *mp = NULL;
uint32_t head;
mutex_enter(&vmplp->hlock);
head = (vmplp->head + 1) & vmplp->quemask;
if (head != vmplp->tail) {
/* we have free mblks */
vmp = vmplp->quep[vmplp->head];
mp = vmp->mp;
vmplp->head = head;
}
mutex_exit(&vmplp->hlock);
return (mp);
}
/*
* Return a mblk to the free pool. Invoked when the upper IP
* layers do freemsg() etc on the mblk they were passed.
*/
void
vio_freeb(void *arg)
{
vio_mblk_t *vmp = (vio_mblk_t *)arg;
vio_mblk_pool_t *vmplp = vmp->vmplp;
vmp->mp = desballoc(vmp->datap, vmplp->mblk_size,
BPRI_MED, &vmp->reclaim);
mutex_enter(&vmplp->tlock);
vmplp->quep[vmplp->tail] = vmp;
vmplp->tail = (vmplp->tail + 1) & vmplp->quemask;
mutex_exit(&vmplp->tlock);
}
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