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      1 $NetBSD: pci_calls,v 1.1 2021/09/15 17:26:07 thorpej Exp $
      2 
      3 /*-
      4  * Copyright (c) 2021 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jason R. Thorpe.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Device calls used by the PCI subsystem.
     34  */
     35 
     36 subsystem pci;
     37 
     38 #include <dev/pci/pcivar.h>
     39 
     40 /*
     41  * pci-bus-get-child-devhandle
     42  *
     43  * Retrieve the devhandle for the PCI device represented by 'tag'
     44  * in the PCI segment represented by 'pc'.  The PCI bus's device_t
     45  * is the one that's passed in the call, and the device whose handle
     46  * is being requested must be a direct child of that bus, otherwise
     47  * behavior is undefined.
     48  *
     49  * Call returns 0 if successful, or an error code upon failure:
     50  *
     51  * ENOTSUP	The device handle implementation for the
     52  *		PCI bus does not support this device call.
     53  *
     54  * ENODEV	The PCI device represented by the pcitag_t
     55  *		was not found in a bus-scoped search of the
     56  *		platform device tree.
     57  */
     58 pci-bus-get-child-devhandle {
     59 	pci_chipset_tag_t pc;		/* IN */
     60 	pcitag_t tag;			/* IN */
     61 	devhandle_t devhandle;		/* OUT */
     62 };
     63