1 /*
2 * This file and its contents are supplied under the terms of the
3 * Common Development and Distribution License ("CDDL"), version 1.0.
4 * You may only use this file in accordance with the terms of version
5 * 1.0 of the CDDL.
6 *
7 * A full copy of the text of the CDDL should have accompanied this
8 * source. A copy of the CDDL is also available via the Internet at
9 * http://www.illumos.org/license/CDDL.
10 */
11
12 /*
13 * Copyright 2020 Oxide Computer Company
14 */
15
16 #include <mlxcx.h>
17 #include <sys/sensors.h>
18
19 /*
20 * The PRM indicates that the temperature is measured in 1/8th degrees.
21 */
22 #define MLXCX_TEMP_GRAN 8
23
24 /*
25 * Read a single temperature sensor entry. The ksensor framework guarantees that
26 * it will only call this once for a given sensor at any time, though multiple
27 * sensors can be in parallel.
28 */
29 static int
mlxcx_temperature_read(void * arg,sensor_ioctl_scalar_t * scalar)30 mlxcx_temperature_read(void *arg, sensor_ioctl_scalar_t *scalar)
31 {
32 boolean_t ok;
33 uint16_t tmp;
34 mlxcx_register_data_t data;
35 mlxcx_temp_sensor_t *sensor = arg;
36 mlxcx_t *mlxp = sensor->mlts_mlx;
37
38 bzero(&data, sizeof (data));
39 data.mlrd_mtmp.mlrd_mtmp_sensor_index = to_be16(sensor->mlts_index);
40 ok = mlxcx_cmd_access_register(mlxp, MLXCX_CMD_ACCESS_REGISTER_READ,
41 MLXCX_REG_MTMP, &data);
42 if (!ok) {
43 return (EIO);
44 }
45
46 tmp = from_be16(data.mlrd_mtmp.mlrd_mtmp_temperature);
47 sensor->mlts_value = (int16_t)tmp;
48 tmp = from_be16(data.mlrd_mtmp.mlrd_mtmp_max_temperature);
49 sensor->mlts_max_value = (int16_t)tmp;
50 bcopy(data.mlrd_mtmp.mlrd_mtmp_name, sensor->mlts_name,
51 sizeof (sensor->mlts_name));
52
53 scalar->sis_unit = SENSOR_UNIT_CELSIUS;
54 scalar->sis_gran = MLXCX_TEMP_GRAN;
55 scalar->sis_prec = 0;
56 scalar->sis_value = (int64_t)sensor->mlts_value;
57
58 return (0);
59 }
60
61 static const ksensor_ops_t mlxcx_temp_ops = {
62 .kso_kind = ksensor_kind_temperature,
63 .kso_scalar = mlxcx_temperature_read
64 };
65
66 void
mlxcx_teardown_sensors(mlxcx_t * mlxp)67 mlxcx_teardown_sensors(mlxcx_t *mlxp)
68 {
69 if (mlxp->mlx_temp_nsensors == 0)
70 return;
71 (void) ksensor_remove(mlxp->mlx_dip, KSENSOR_ALL_IDS);
72 kmem_free(mlxp->mlx_temp_sensors, sizeof (mlxcx_temp_sensor_t) *
73 mlxp->mlx_temp_nsensors);
74 }
75
76 boolean_t
mlxcx_setup_sensors(mlxcx_t * mlxp)77 mlxcx_setup_sensors(mlxcx_t *mlxp)
78 {
79 mlxcx_register_data_t data;
80 boolean_t ok;
81
82 mlxp->mlx_temp_nsensors = 0;
83 bzero(&data, sizeof (data));
84 ok = mlxcx_cmd_access_register(mlxp, MLXCX_CMD_ACCESS_REGISTER_READ,
85 MLXCX_REG_MTCAP, &data);
86 if (!ok) {
87 return (B_FALSE);
88 }
89
90 if (data.mlrd_mtcap.mlrd_mtcap_sensor_count == 0) {
91 return (B_TRUE);
92 }
93
94 mlxp->mlx_temp_nsensors = data.mlrd_mtcap.mlrd_mtcap_sensor_count;
95 mlxp->mlx_temp_sensors = kmem_zalloc(sizeof (mlxcx_temp_sensor_t) *
96 mlxp->mlx_temp_nsensors, KM_SLEEP);
97
98 for (uint8_t i = 0; i < mlxp->mlx_temp_nsensors; i++) {
99 char buf[32];
100 int ret;
101
102 if (snprintf(buf, sizeof (buf), "temp%u", i) >= sizeof (buf)) {
103 mlxcx_warn(mlxp, "sensor name %u would overflow "
104 "internal buffer");
105 goto err;
106 }
107
108 mlxp->mlx_temp_sensors[i].mlts_mlx = mlxp;
109 mlxp->mlx_temp_sensors[i].mlts_index = i;
110
111 ret = ksensor_create_scalar_pcidev(mlxp->mlx_dip,
112 SENSOR_KIND_TEMPERATURE, &mlxcx_temp_ops,
113 &mlxp->mlx_temp_sensors[i], buf,
114 &mlxp->mlx_temp_sensors[i].mlts_ksensor);
115 if (ret != 0) {
116 mlxcx_warn(mlxp, "failed to create temp sensor %s: %d",
117 buf, ret);
118 goto err;
119 }
120 }
121
122 return (B_TRUE);
123 err:
124 mlxcx_teardown_sensors(mlxp);
125 return (B_FALSE);
126 }
127