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be79a2c60f
We must check MagicValue not just Version before anything else, and then we must check DeviceID and immediately abort if zero (and this must not be an error). Do all this when probing rather than at the start of attaching as that's where this belongs, and provides a clear boundary between the device detection and device initialisation parts of the specified driver initialisation process. This also means we don't create empty device instances for placeholder devices, reducing clutter on systems that pre-allocate a large number, such as QEMU's AArch64 virt machine (which provides 32). Reviewed by: bryanv Differential Revision: https://reviews.freebsd.org/D28070
85 lines
2.8 KiB
C
85 lines
2.8 KiB
C
/*-
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* Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
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* Copyright (c) 2014 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by SRI International and the University of
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* Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
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* ("CTSRD"), as part of the DARPA CRASH research programme.
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*
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* Portions of this software were developed by Andrew Turner
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* under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* VirtIO MMIO interface.
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* This driver is heavily based on VirtIO PCI interface driver.
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*/
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#include "opt_acpi.h"
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <contrib/dev/acpica/include/acpi.h>
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#include <dev/acpica/acpivar.h>
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#include <dev/virtio/mmio/virtio_mmio.h>
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static int vtmmio_acpi_probe(device_t);
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static device_method_t vtmmio_acpi_methods[] = {
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/* Device interface. */
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DEVMETHOD(device_probe, vtmmio_acpi_probe),
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DEVMETHOD_END
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};
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DEFINE_CLASS_1(virtio_mmio, vtmmio_acpi_driver, vtmmio_acpi_methods,
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sizeof(struct vtmmio_softc), vtmmio_driver);
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static devclass_t vtmmio_acpi_devclass;
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DRIVER_MODULE(virtio_mmio, acpi, vtmmio_acpi_driver, vtmmio_acpi_devclass, 0,0);
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MODULE_DEPEND(virtio_mmio, acpi, 1, 1, 1);
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static int
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vtmmio_acpi_probe(device_t dev)
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{
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ACPI_HANDLE h;
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if ((h = acpi_get_handle(dev)) == NULL)
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return (ENXIO);
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if (!acpi_MatchHid(h, "LNRO0005"))
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return (ENXIO);
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return (vtmmio_probe(dev));
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}
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