1 /* $NetBSD: acpi_pdc.c,v 1.2 2011/06/20 15:39:54 jruoho Exp $ */
2
3 /*-
4 * Copyright (c) 2010, 2011 Jukka Ruohonen <jruohonen@iki.fi>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: acpi_pdc.c,v 1.2 2011/06/20 15:39:54 jruoho Exp $");
31
32 #include <sys/param.h>
33
34 #include <x86/cpu.h>
35 #include <x86/cputypes.h>
36 #include <x86/cpuvar.h>
37
38 #include <dev/acpi/acpireg.h>
39 #include <dev/acpi/acpivar.h>
40 #include <dev/acpi/acpi_cpu.h>
41
42 #include <machine/acpi_machdep.h>
43
44 #define _COMPONENT ACPI_BUS_COMPONENT
45 ACPI_MODULE_NAME ("acpi_pdc")
46
47 static uint32_t flags = 0;
48
49 static ACPI_STATUS acpi_md_pdc_walk(ACPI_HANDLE, uint32_t,void *,void **);
50 static void acpi_md_pdc_set(ACPI_HANDLE, uint32_t);
51
52 uint32_t
acpi_md_pdc(void)53 acpi_md_pdc(void)
54 {
55 struct cpu_info *ci = curcpu();
56 uint32_t regs[4];
57
58 if (flags != 0)
59 return flags;
60
61 if (cpu_vendor != CPUVENDOR_IDT &&
62 cpu_vendor != CPUVENDOR_INTEL)
63 return 0;
64
65 /*
66 * Basic SMP C-states (required for e.g. _CST).
67 */
68 flags |= ACPICPU_PDC_C_C1PT | ACPICPU_PDC_C_C2C3;
69
70 /*
71 * Claim to support dependency coordination.
72 */
73 flags |= ACPICPU_PDC_P_SW | ACPICPU_PDC_C_SW | ACPICPU_PDC_T_SW;
74
75 /*
76 * If MONITOR/MWAIT is available, announce
77 * support for native instructions in all C-states.
78 */
79 if ((ci->ci_feat_val[1] & CPUID2_MONITOR) != 0)
80 flags |= ACPICPU_PDC_C_C1_FFH | ACPICPU_PDC_C_C2C3_FFH;
81
82 /*
83 * Set native P- and T-states, if available.
84 */
85 if ((ci->ci_feat_val[1] & CPUID2_EST) != 0)
86 flags |= ACPICPU_PDC_P_FFH;
87
88 if ((ci->ci_feat_val[0] & CPUID_ACPI) != 0)
89 flags |= ACPICPU_PDC_T_FFH;
90
91 /*
92 * Declare support for APERF and MPERF.
93 */
94 if (cpuid_level >= 0x06) {
95
96 x86_cpuid(0x00000006, regs);
97
98 if ((regs[2] & CPUID_DSPM_HWF) != 0)
99 flags |= ACPICPU_PDC_P_HWF;
100 }
101
102 /*
103 * As the _PDC must be evaluated before the internal namespace
104 * is built, we have no option but to walk with the interpreter.
105 */
106 (void)AcpiWalkNamespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
107 UINT32_MAX, acpi_md_pdc_walk, NULL, NULL, NULL);
108
109 return flags;
110 }
111
112 static ACPI_STATUS
acpi_md_pdc_walk(ACPI_HANDLE hdl,uint32_t level,void * aux,void ** sta)113 acpi_md_pdc_walk(ACPI_HANDLE hdl, uint32_t level, void *aux, void **sta)
114 {
115 struct cpu_info *ci;
116
117 ci = acpi_match_cpu_handle(hdl);
118
119 if (ci != NULL)
120 acpi_md_pdc_set(hdl, flags);
121
122 return AE_OK;
123 }
124
125 static void
acpi_md_pdc_set(ACPI_HANDLE hdl,uint32_t val)126 acpi_md_pdc_set(ACPI_HANDLE hdl, uint32_t val)
127 {
128 ACPI_OBJECT_LIST arg;
129 ACPI_OBJECT obj;
130 uint32_t cap[3];
131
132 arg.Count = 1;
133 arg.Pointer = &obj;
134
135 cap[0] = ACPICPU_PDC_REVID;
136 cap[1] = 1;
137 cap[2] = val;
138
139 obj.Type = ACPI_TYPE_BUFFER;
140 obj.Buffer.Length = sizeof(cap);
141 obj.Buffer.Pointer = (void *)cap;
142
143 (void)AcpiEvaluateObject(hdl, "_PDC", &arg, NULL);
144 }
145