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/*-
* Copyright (c) 1998 - 2008 Søren Schmidt <sos@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer,
* without modification, immediately at the beginning of the file.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*-
* Copyright (c) 2009-2013 Microsoft Corp.
* Copyright (c) 2012 NetApp Inc.
* Copyright (c) 2012 Citrix Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/ata.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/malloc.h>
#include <sys/sema.h>
#include <sys/taskqueue.h>
#include <vm/uma.h>
#include <machine/stdarg.h>
#include <machine/resource.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/ata/ata-all.h>
#include <dev/ata/ata-pci.h>
#include <ata_if.h>
#define HV_X64_MSR_GUEST_OS_ID 0x40000000
#define HV_X64_CPUID_MIN 0x40000005
#define HV_X64_CPUID_MAX 0x4000ffff
/* prototypes */
static int hv_ata_pci_probe(device_t dev);
static int hv_ata_pci_attach(device_t dev);
static int hv_ata_pci_detach(device_t dev);
static int hv_check_for_hyper_v(void);
/*
* generic PCI ATA device probe
*/
static int
hv_ata_pci_probe(device_t dev)
{
int ata_disk_enable = 0;
if(bootverbose)
device_printf(dev,
"hv_ata_pci_probe dev_class/subslcass = %d, %d\n",
pci_get_class(dev), pci_get_subclass(dev));
/* is this a storage class device ? */
if (pci_get_class(dev) != PCIC_STORAGE)
return (ENXIO);
/* is this an IDE/ATA type device ? */
if (pci_get_subclass(dev) != PCIS_STORAGE_IDE)
return (ENXIO);
if(bootverbose)
device_printf(dev,
"Hyper-V probe for disabling ATA-PCI, emulated driver\n");
/*
* On Hyper-V the default is to use the enlightened driver for
* IDE disks. However, if the user wishes to use the native
* ATA driver, the environment variable
* hw_ata.disk_enable must be explicitly set to 1.
*/
if (hv_check_for_hyper_v()) {
if (getenv_int("hw.ata.disk_enable", &ata_disk_enable)) {
if(bootverbose)
device_printf(dev,
"hw.ata.disk_enable flag is disabling Hyper-V"
" ATA driver support\n");
return (ENXIO);
}
}
if(bootverbose)
device_printf(dev, "Hyper-V ATA storage driver enabled.\n");
return (BUS_PROBE_VENDOR);
}
static int
hv_ata_pci_attach(device_t dev)
{
return 0;
}
static int
hv_ata_pci_detach(device_t dev)
{
return 0;
}
/**
* Detect Hyper-V and enable fast IDE
* via enlighted storage driver
*/
static int
hv_check_for_hyper_v(void)
{
u_int regs[4];
int hyper_v_detected = 0;
do_cpuid(1, regs);
if (regs[2] & 0x80000000) {
/* if(a hypervisor is detected) */
/* make sure this really is Hyper-V */
/* we look at the CPUID info */
do_cpuid(HV_X64_MSR_GUEST_OS_ID, regs);
hyper_v_detected =
regs[0] >= HV_X64_CPUID_MIN &&
regs[0] <= HV_X64_CPUID_MAX &&
!memcmp("Microsoft Hv", ®s[1], 12);
}
return (hyper_v_detected);
}
static device_method_t hv_ata_pci_methods[] = {
/* device interface */
DEVMETHOD(device_probe, hv_ata_pci_probe),
DEVMETHOD(device_attach, hv_ata_pci_attach),
DEVMETHOD(device_detach, hv_ata_pci_detach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD_END
};
devclass_t hv_ata_pci_devclass;
static driver_t hv_ata_pci_disengage_driver = {
"pciata-disable",
hv_ata_pci_methods,
sizeof(struct ata_pci_controller),
};
DRIVER_MODULE(atapci_dis, pci, hv_ata_pci_disengage_driver,
hv_ata_pci_devclass, NULL, NULL);
MODULE_VERSION(atapci_dis, 1);
MODULE_DEPEND(atapci_dis, ata, 1, 1, 1);
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