sys/pci/pci_axq.h

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 (c) 2001 by Sun Microsystems, Inc.
 * All rights reserved.
 */

#ifndef _SYS_PCI_AXQ_H
#define _SYS_PCI_AXQ_H

#include <sys/types.h>
#include <sys/atomic.h>

#ifdef  __cplusplus
extern "C" {
#endif

#define PIO_LIMIT_ENTER(p)  { \
                int n;\
                for (;;) {\
                    do {\
                        n = p->pbm_pio_counter;\
                    } while (n <= 0);\
                    if (atomic_dec_32_nv(\
                        (uint_t *)&p->pbm_pio_counter)\
                        == (n - 1))\
                        break;\
                    atomic_inc_32(\
                        (uint_t *)&p->pbm_pio_counter);\
                }\
                }


#define PIO_LIMIT_EXIT(p)   atomic_inc_32((uint_t *)&p->pbm_pio_counter);

extern void pci_axq_setup(ddi_map_req_t *mp, pbm_t *pbm_p);
extern void pci_axq_pio_limit(pbm_t *pbm_p);

#ifdef  __cplusplus
}
#endif

#endif  /* _SYS_PCI_AXQ_H */