FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powernv/opal_hmi.c

     /*-
      * Copyright (c) 2019 Justin Hibbits
      *
      * 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.
     * 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/types.h>
    #include <sys/eventhandler.h>
    #include <sys/kernel.h>
    #include <sys/systm.h>
    #include <sys/endian.h>
    
    #include <vm/vm.h>
    #include <vm/pmap.h>
    
    #include <machine/spr.h>
    #include <machine/trap.h>
    #include "opal.h"
    
    struct opal_hmi_event {
            uint8_t         version;
            uint8_t         severity;
            uint8_t         type;
            uint8_t         disposition;
            uint8_t         rsvd_1[4];
            uint64_t        hmer;
            uint64_t        tfmr;
            union {
                    struct {
                            uint8_t         xstop_type;
                            uint8_t         rsvd_2[3];
                            uint32_t        xstop_reason;
                            union {
                                    uint32_t        pir;
                                    uint32_t        chip_id;
                            };
                    };
            };
    };
    
    #define HMI_DISP_RECOVERED      0
    #define HMI_DISP_NOT_RECOVERED  1
    
    static void
    opal_hmi_event_handler(void *unused, struct opal_msg *msg)
    {
            struct opal_hmi_event   evt;
    
            memcpy(&evt, &msg->params, sizeof(evt));
            printf("Hypervisor Maintenance Event received"
                "(Severity %d, type %d, HMER: %016lx).\n",
                evt.severity, evt.type, evt.hmer);
    
            if (evt.disposition == HMI_DISP_NOT_RECOVERED)
                    panic("Unrecoverable hypervisor maintenance exception on CPU %d",
                        evt.pir);
    
            return;
    }
    
    static int
    opal_hmi_handler2(struct trapframe *frame)
    {
            /*
             * Use DMAP preallocated pcpu memory to handle
             * the phys flags pointer.
             */
            uint64_t *flags = PCPU_PTR(aim.opal_hmi_flags);
            int err;
    
            *flags = 0;
            err = opal_call(OPAL_HANDLE_HMI2, DMAP_TO_PHYS((vm_offset_t)flags));
    
            if (be64toh(*flags) & OPAL_HMI_FLAGS_TOD_TB_FAIL)
                    panic("TOD/TB recovery failure");
    
           if (err == OPAL_SUCCESS)
                   return (0);
   
           printf("HMI handler failed!  OPAL error code: %d\n", err);
   
           return (-1);
   }
   
   static int
   opal_hmi_handler(struct trapframe *frame)
   {
           int err;
   
           err = opal_call(OPAL_HANDLE_HMI);
   
           if (err == OPAL_SUCCESS)
                   return (0);
   
           printf("HMI handler failed!  OPAL error code: %d\n", err);
   
           return (-1);
   }
   
   static void
   opal_setup_hmi(void *data)
   {
           /* This only works for OPAL, so first make sure we have it. */
           if (opal_check() != 0)
                   return;
   
           if (opal_call(OPAL_CHECK_TOKEN, OPAL_HANDLE_HMI2) == OPAL_TOKEN_PRESENT)
                   hmi_handler = opal_hmi_handler2;
           else if (opal_call(OPAL_CHECK_TOKEN, OPAL_HANDLE_HMI) == OPAL_TOKEN_PRESENT)
                   hmi_handler = opal_hmi_handler;
           else {
                   printf("Warning: No OPAL HMI handler found.\n");
                   return;
           }
   
           EVENTHANDLER_REGISTER(OPAL_HMI_EVT, opal_hmi_event_handler, NULL,
               EVENTHANDLER_PRI_ANY);
   
           if (bootverbose)
                   printf("Installed OPAL HMI handler.\n");
   }
   
   SYSINIT(opal_setup_hmi, SI_SUB_CPU, SI_ORDER_ANY, opal_setup_hmi, NULL);

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