]>
Commit | Line | Data |
---|---|---|
78f16996 AC |
1 | #include <linux/dmi.h> |
2 | ||
3 | #include <acpi/acpi_drivers.h> | |
4 | #include <acpi/processor.h> | |
5 | ||
6 | #include "internal.h" | |
7 | ||
8 | #define PREFIX "ACPI: " | |
9 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT | |
10 | ACPI_MODULE_NAME("processor_pdc"); | |
11 | ||
12 | static int set_no_mwait(const struct dmi_system_id *id) | |
13 | { | |
14 | printk(KERN_NOTICE PREFIX "%s detected - " | |
15 | "disabling mwait for CPU C-states\n", id->ident); | |
16 | idle_nomwait = 1; | |
17 | return 0; | |
18 | } | |
19 | ||
20 | static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = { | |
21 | { | |
22 | set_no_mwait, "IFL91 board", { | |
23 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
24 | DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"), | |
25 | DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"), | |
26 | DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL}, | |
27 | { | |
28 | set_no_mwait, "Extensa 5220", { | |
29 | DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
30 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), | |
31 | DMI_MATCH(DMI_PRODUCT_VERSION, "0100"), | |
32 | DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL}, | |
33 | {}, | |
34 | }; | |
35 | ||
36 | /* | |
37 | * _PDC is required for a BIOS-OS handshake for most of the newer | |
38 | * ACPI processor features. | |
39 | */ | |
40 | static int acpi_processor_eval_pdc(struct acpi_processor *pr) | |
41 | { | |
42 | struct acpi_object_list *pdc_in = pr->pdc; | |
43 | acpi_status status = AE_OK; | |
44 | ||
45 | if (!pdc_in) | |
46 | return status; | |
47 | if (idle_nomwait) { | |
48 | /* | |
49 | * If mwait is disabled for CPU C-states, the C2C3_FFH access | |
50 | * mode will be disabled in the parameter of _PDC object. | |
51 | * Of course C1_FFH access mode will also be disabled. | |
52 | */ | |
53 | union acpi_object *obj; | |
54 | u32 *buffer = NULL; | |
55 | ||
56 | obj = pdc_in->pointer; | |
57 | buffer = (u32 *)(obj->buffer.pointer); | |
58 | buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH); | |
59 | ||
60 | } | |
61 | status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL); | |
62 | ||
63 | if (ACPI_FAILURE(status)) | |
64 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
65 | "Could not evaluate _PDC, using legacy perf. control.\n")); | |
66 | ||
67 | return status; | |
68 | } | |
69 | ||
70 | void acpi_processor_set_pdc(struct acpi_processor *pr) | |
71 | { | |
1d9cb470 AC |
72 | if (arch_has_acpi_pdc() == false) |
73 | return; | |
74 | ||
78f16996 AC |
75 | arch_acpi_processor_init_pdc(pr); |
76 | acpi_processor_eval_pdc(pr); | |
77 | arch_acpi_processor_cleanup_pdc(pr); | |
78 | } | |
79 | EXPORT_SYMBOL_GPL(acpi_processor_set_pdc); | |
80 | ||
81 | static acpi_status | |
82 | early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv) | |
83 | { | |
84 | struct acpi_processor pr; | |
85 | ||
86 | pr.handle = handle; | |
87 | ||
88 | /* x86 implementation looks at pr.id to determine some | |
89 | * CPU capabilites. We can just hard code to 0 since we're | |
90 | * assuming the CPUs in the system are homogenous and all | |
91 | * have the same capabilities. | |
92 | */ | |
93 | pr.id = 0; | |
94 | ||
95 | acpi_processor_set_pdc(&pr); | |
96 | ||
97 | return AE_OK; | |
98 | } | |
99 | ||
100 | void acpi_early_processor_set_pdc(void) | |
101 | { | |
102 | /* | |
103 | * Check whether the system is DMI table. If yes, OSPM | |
104 | * should not use mwait for CPU-states. | |
105 | */ | |
106 | dmi_check_system(processor_idle_dmi_table); | |
107 | ||
108 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, | |
109 | ACPI_UINT32_MAX, | |
110 | early_init_pdc, NULL, NULL, NULL); | |
111 | } |