Add xhci_quiesce to support fast reboot.

*** 9,18 ****
--- 9,19 ----
   * http://www.illumos.org/license/CDDL.
   */
  
  /*
   * Copyright (c) 2017, Joyent, Inc.
+  * Copyright (c) 2018, Western Digital Corporation.
   */
  
  /*
   * Extensible Host Controller Interface (xHCI) USB Driver
   *
*** 1011,1024 ****
  xhci_check_regs_acc(xhci_t *xhcip)
  {
          ddi_fm_error_t de;
  
          /*
!          * Treat the case where we can't check as fine so we can treat the code
           * more simply.
           */
!         if (!DDI_FM_ACC_ERR_CAP(xhcip->xhci_fm_caps))
                  return (DDI_FM_OK);
  
          ddi_fm_acc_err_get(xhcip->xhci_regs_handle, &de, DDI_FME_VERSION);
          ddi_fm_acc_err_clear(xhcip->xhci_regs_handle, DDI_FME_VERSION);
          return (de.fme_status);
--- 1012,1025 ----
  xhci_check_regs_acc(xhci_t *xhcip)
  {
          ddi_fm_error_t de;
  
          /*
!          * Treat cases where we can't check as fine so we can treat the code
           * more simply.
           */
!         if (quiesce_active || !DDI_FM_ACC_ERR_CAP(xhcip->xhci_fm_caps))
                  return (DDI_FM_OK);
  
          ddi_fm_acc_err_get(xhcip->xhci_regs_handle, &de, DDI_FME_VERSION);
          ddi_fm_acc_err_clear(xhcip->xhci_regs_handle, DDI_FME_VERSION);
          return (de.fme_status);
*** 1969,1978 ****
--- 1970,1991 ----
          ddi_soft_state_free(xhci_soft_state, inst);
  
          return (DDI_SUCCESS);
  }
  
+ /* QUIESCE(9E) to support fast reboot */
+ int
+ xhci_quiesce(dev_info_t *dip)
+ {
+         xhci_t *xhcip;
+ 
+         xhcip = ddi_get_soft_state(xhci_soft_state, ddi_get_instance(dip));
+ 
+         return (xhci_controller_stop(xhcip) == 0 &&
+             xhci_controller_reset(xhcip) == 0 ? DDI_SUCCESS : DDI_FAILURE);
+ }
+ 
  static int
  xhci_attach(dev_info_t *dip, ddi_attach_cmd_t cmd)
  {
          int ret, inst, route;
          xhci_t *xhcip;
*** 2181,2191 ****
          xhci_detach,                    /* devo_detach */
          nodev,                          /* devo_reset */
          &xhci_cb_ops,                   /* devo_cb_ops */
          &usba_hubdi_busops,             /* devo_bus_ops */
          usba_hubdi_root_hub_power,      /* devo_power */
!         ddi_quiesce_not_supported       /* devo_quiesce */
  };
  
  static struct modldrv xhci_modldrv = {
          &mod_driverops,
          "USB xHCI Driver",
--- 2194,2204 ----
          xhci_detach,                    /* devo_detach */
          nodev,                          /* devo_reset */
          &xhci_cb_ops,                   /* devo_cb_ops */
          &usba_hubdi_busops,             /* devo_bus_ops */
          usba_hubdi_root_hub_power,      /* devo_power */
!         xhci_quiesce                    /* devo_quiesce */
  };
  
  static struct modldrv xhci_modldrv = {
          &mod_driverops,
          "USB xHCI Driver",