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/param.h>
27 #include <sys/types.h>
28 #include <sys/eventhandler.h>
29 #include <sys/kernel.h>
30 #include <sys/systm.h>
31 #include <sys/endian.h>
32
33 #include <vm/vm.h>
34 #include <vm/pmap.h>
35
36 #include <machine/spr.h>
37 #include <machine/trap.h>
38 #include "opal.h"
39
40 struct opal_hmi_event {
41 uint8_t version;
42 uint8_t severity;
43 uint8_t type;
44 uint8_t disposition;
45 uint8_t rsvd_1[4];
46 uint64_t hmer;
47 uint64_t tfmr;
48 union {
49 struct {
50 uint8_t xstop_type;
51 uint8_t rsvd_2[3];
52 uint32_t xstop_reason;
53 union {
54 uint32_t pir;
55 uint32_t chip_id;
56 };
57 };
58 };
59 };
60
61 #define HMI_DISP_RECOVERED 0
62 #define HMI_DISP_NOT_RECOVERED 1
63
64 static void
opal_hmi_event_handler(void * unused,struct opal_msg * msg)65 opal_hmi_event_handler(void *unused, struct opal_msg *msg)
66 {
67 struct opal_hmi_event evt;
68
69 memcpy(&evt, &msg->params, sizeof(evt));
70 printf("Hypervisor Maintenance Event received"
71 "(Severity %d, type %d, HMER: %016lx).\n",
72 evt.severity, evt.type, evt.hmer);
73
74 if (evt.disposition == HMI_DISP_NOT_RECOVERED)
75 panic("Unrecoverable hypervisor maintenance exception on CPU %d",
76 evt.pir);
77
78 return;
79 }
80
81 static int
opal_hmi_handler2(struct trapframe * frame)82 opal_hmi_handler2(struct trapframe *frame)
83 {
84 /*
85 * Use DMAP preallocated pcpu memory to handle
86 * the phys flags pointer.
87 */
88 uint64_t *flags = PCPU_PTR(aim.opal_hmi_flags);
89 int err;
90
91 *flags = 0;
92 err = opal_call(OPAL_HANDLE_HMI2, DMAP_TO_PHYS((vm_offset_t)flags));
93
94 if (be64toh(*flags) & OPAL_HMI_FLAGS_TOD_TB_FAIL)
95 panic("TOD/TB recovery failure");
96
97 if (err == OPAL_SUCCESS)
98 return (0);
99
100 printf("HMI handler failed! OPAL error code: %d\n", err);
101
102 return (-1);
103 }
104
105 static int
opal_hmi_handler(struct trapframe * frame)106 opal_hmi_handler(struct trapframe *frame)
107 {
108 int err;
109
110 err = opal_call(OPAL_HANDLE_HMI);
111
112 if (err == OPAL_SUCCESS)
113 return (0);
114
115 printf("HMI handler failed! OPAL error code: %d\n", err);
116
117 return (-1);
118 }
119
120 static void
opal_setup_hmi(void * data)121 opal_setup_hmi(void *data)
122 {
123 /* This only works for OPAL, so first make sure we have it. */
124 if (opal_check() != 0)
125 return;
126
127 if (opal_call(OPAL_CHECK_TOKEN, OPAL_HANDLE_HMI2) == OPAL_TOKEN_PRESENT)
128 hmi_handler = opal_hmi_handler2;
129 else if (opal_call(OPAL_CHECK_TOKEN, OPAL_HANDLE_HMI) == OPAL_TOKEN_PRESENT)
130 hmi_handler = opal_hmi_handler;
131 else {
132 printf("Warning: No OPAL HMI handler found.\n");
133 return;
134 }
135
136 EVENTHANDLER_REGISTER(OPAL_HMI_EVT, opal_hmi_event_handler, NULL,
137 EVENTHANDLER_PRI_ANY);
138
139 if (bootverbose)
140 printf("Installed OPAL HMI handler.\n");
141 }
142
143 SYSINIT(opal_setup_hmi, SI_SUB_CPU, SI_ORDER_ANY, opal_setup_hmi, NULL);
144