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Diffstat (limited to 'drivers/ata/ata_piix.c')
-rw-r--r--drivers/ata/ata_piix.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index 7857e8f..3c809bf 100644
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -1554,6 +1554,39 @@ static bool piix_broken_system_poweroff(struct pci_dev *pdev)
return false;
}
+static int prefer_ms_hyperv = 1;
+module_param(prefer_ms_hyperv, int, 0);
+
+static void piix_ignore_devices_quirk(struct ata_host *host)
+{
+#if IS_ENABLED(CONFIG_HYPERV_STORAGE)
+ static const struct dmi_system_id ignore_hyperv[] = {
+ {
+ /* On Hyper-V hypervisors the disks are exposed on
+ * both the emulated SATA controller and on the
+ * paravirtualised drivers. The CD/DVD devices
+ * are only exposed on the emulated controller.
+ * Request we ignore ATA devices on this host.
+ */
+ .ident = "Hyper-V Virtual Machine",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR,
+ "Microsoft Corporation"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Virtual Machine"),
+ },
+ },
+ { } /* terminate list */
+ };
+ const struct dmi_system_id *dmi = dmi_first_match(ignore_hyperv);
+
+ if (dmi && prefer_ms_hyperv) {
+ host->flags |= ATA_HOST_IGNORE_ATA;
+ dev_info(host->dev, "%s detected, ATA device ignore set\n",
+ dmi->ident);
+ }
+#endif
+}
+
/**
* piix_init_one - Register PIIX ATA PCI device with kernel services
* @pdev: PCI device to register
@@ -1669,6 +1702,9 @@ static int __devinit piix_init_one(struct pci_dev *pdev,
}
host->flags |= ATA_HOST_PARALLEL_SCAN;
+ /* Allow hosts to specify device types to ignore when scanning. */
+ piix_ignore_devices_quirk(host);
+
pci_set_master(pdev);
return ata_pci_sff_activate_host(host, ata_bmdma_interrupt, sht);
}