aboutsummaryrefslogtreecommitdiffstats
path: root/sys/dev/hyperv/stordisengage/hv_ata_pci_disengage.c
diff options
context:
space:
mode:
Diffstat (limited to 'sys/dev/hyperv/stordisengage/hv_ata_pci_disengage.c')
-rw-r--r--sys/dev/hyperv/stordisengage/hv_ata_pci_disengage.c194
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 000000000000..2fdf9d49d29e
--- /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", &regs[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);
+
+