1 /*- 2 * Copyright (c) 2019 Justin Hibbits 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD$"); 28 29 #include <sys/param.h> 30 #include <sys/types.h> 31 #include <sys/eventhandler.h> 32 #include <sys/kernel.h> 33 #include <sys/systm.h> 34 #include <sys/endian.h> 35 36 #include <vm/vm.h> 37 #include <vm/pmap.h> 38 39 #include <machine/spr.h> 40 #include <machine/trap.h> 41 #include "opal.h" 42 43 struct opal_hmi_event { 44 uint8_t version; 45 uint8_t severity; 46 uint8_t type; 47 uint8_t disposition; 48 uint8_t rsvd_1[4]; 49 uint64_t hmer; 50 uint64_t tfmr; 51 union { 52 struct { 53 uint8_t xstop_type; 54 uint8_t rsvd_2[3]; 55 uint32_t xstop_reason; 56 union { 57 uint32_t pir; 58 uint32_t chip_id; 59 }; 60 }; 61 }; 62 }; 63 64 #define HMI_DISP_RECOVERED 0 65 #define HMI_DISP_NOT_RECOVERED 1 66 67 static void 68 opal_hmi_event_handler(void *unused, struct opal_msg *msg) 69 { 70 struct opal_hmi_event evt; 71 72 memcpy(&evt, &msg->params, sizeof(evt)); 73 printf("Hypervisor Maintenance Event received" 74 "(Severity %d, type %d, HMER: %016lx).\n", 75 evt.severity, evt.type, evt.hmer); 76 77 if (evt.disposition == HMI_DISP_NOT_RECOVERED) 78 panic("Unrecoverable hypervisor maintenance exception on CPU %d", 79 evt.pir); 80 81 return; 82 } 83 84 static int 85 opal_hmi_handler(struct trapframe *frame) 86 { 87 int err; 88 89 err = opal_call(OPAL_HANDLE_HMI); 90 91 if (err == OPAL_SUCCESS) { 92 mtspr(SPR_HMER, 0); 93 return (0); 94 } 95 96 printf("HMI handler failed! OPAL error code: %d\n", err); 97 98 return (-1); 99 } 100 101 static void 102 opal_setup_hmi(void *data) 103 { 104 /* This only works for OPAL, so first make sure we have it. */ 105 if (opal_check() != 0) 106 return; 107 108 if (opal_call(OPAL_CHECK_TOKEN, OPAL_HANDLE_HMI) == OPAL_TOKEN_PRESENT) 109 hmi_handler = opal_hmi_handler; 110 else { 111 printf("Warning: No OPAL HMI handler found.\n"); 112 return; 113 } 114 115 EVENTHANDLER_REGISTER(OPAL_HMI_EVT, opal_hmi_event_handler, NULL, 116 EVENTHANDLER_PRI_ANY); 117 118 if (bootverbose) 119 printf("Installed OPAL HMI handler.\n"); 120 } 121 122 SYSINIT(opal_setup_hmi, SI_SUB_CPU, SI_ORDER_ANY, opal_setup_hmi, NULL); 123