diff options
Diffstat (limited to 'sys/dev/hyperv/stordisengage/hv_ata_pci_disengage.c')
| -rw-r--r-- | sys/dev/hyperv/stordisengage/hv_ata_pci_disengage.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/sys/dev/hyperv/stordisengage/hv_ata_pci_disengage.c b/sys/dev/hyperv/stordisengage/hv_ata_pci_disengage.c new file mode 100644 index 0000000..2fdf9d4 --- /dev/null +++ b/sys/dev/hyperv/stordisengage/hv_ata_pci_disengage.c @@ -0,0 +1,194 @@ +/*- + * 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); + + |
