processor_core.c revision 78ed8bd2944b6400f742306e5fe9d1b9b6bf18ba 
1/*
2 * Copyright (C) 2005 Intel Corporation
3 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
4 *
5 *	Alex Chiang <achiang@hp.com>
6 *	- Unified x86/ia64 implementations
7 *	Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
8 *	- Added _PDC for platforms with Intel CPUs
9 */
10#include <linux/dmi.h>
11
12#include <acpi/acpi_drivers.h>
13#include <acpi/processor.h>
14
15#include "internal.h"
16
17#define PREFIX			"ACPI: "
18#define _COMPONENT		ACPI_PROCESSOR_COMPONENT
19ACPI_MODULE_NAME("processor_core");
20
21static int set_no_mwait(const struct dmi_system_id *id)
22{
23	printk(KERN_NOTICE PREFIX "%s detected - "
24		"disabling mwait for CPU C-states\n", id->ident);
25	idle_nomwait = 1;
26	return 0;
27}
28
29static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
30	{
31	set_no_mwait, "IFL91 board", {
32	DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
33	DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
34	DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
35	DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
36	{
37	set_no_mwait, "Extensa 5220", {
38	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
39	DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
40	DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
41	DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
42	{},
43};
44
45#ifdef CONFIG_SMP
46static struct acpi_table_madt *madt;
47
48static int map_lapic_id(struct acpi_subtable_header *entry,
49		 u32 acpi_id, int *apic_id)
50{
51	struct acpi_madt_local_apic *lapic =
52		(struct acpi_madt_local_apic *)entry;
53	if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
54	    lapic->processor_id == acpi_id) {
55		*apic_id = lapic->id;
56		return 1;
57	}
58	return 0;
59}
60
61static int map_x2apic_id(struct acpi_subtable_header *entry,
62			 int device_declaration, u32 acpi_id, int *apic_id)
63{
64	struct acpi_madt_local_x2apic *apic =
65		(struct acpi_madt_local_x2apic *)entry;
66	u32 tmp = apic->local_apic_id;
67
68	/* Only check enabled APICs*/
69	if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
70		return 0;
71
72	/* Device statement declaration type */
73	if (device_declaration) {
74		if (apic->uid == acpi_id)
75			goto found;
76	}
77
78	return 0;
79found:
80	*apic_id = tmp;
81	return 1;
82}
83
84static int map_lsapic_id(struct acpi_subtable_header *entry,
85		int device_declaration, u32 acpi_id, int *apic_id)
86{
87	struct acpi_madt_local_sapic *lsapic =
88		(struct acpi_madt_local_sapic *)entry;
89	u32 tmp = (lsapic->id << 8) | lsapic->eid;
90
91	/* Only check enabled APICs*/
92	if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
93		return 0;
94
95	/* Device statement declaration type */
96	if (device_declaration) {
97		if (entry->length < 16)
98			printk(KERN_ERR PREFIX
99			    "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
100			    tmp);
101		else if (lsapic->uid == acpi_id)
102			goto found;
103	/* Processor statement declaration type */
104	} else if (lsapic->processor_id == acpi_id)
105		goto found;
106
107	return 0;
108found:
109	*apic_id = tmp;
110	return 1;
111}
112
113static int map_madt_entry(int type, u32 acpi_id)
114{
115	unsigned long madt_end, entry;
116	int apic_id = -1;
117
118	if (!madt)
119		return apic_id;
120
121	entry = (unsigned long)madt;
122	madt_end = entry + madt->header.length;
123
124	/* Parse all entries looking for a match. */
125
126	entry += sizeof(struct acpi_table_madt);
127	while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
128		struct acpi_subtable_header *header =
129			(struct acpi_subtable_header *)entry;
130		if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
131			if (map_lapic_id(header, acpi_id, &apic_id))
132				break;
133		} else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
134			if (map_x2apic_id(header, type, acpi_id, &apic_id))
135				break;
136		} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
137			if (map_lsapic_id(header, type, acpi_id, &apic_id))
138				break;
139		}
140		entry += header->length;
141	}
142	return apic_id;
143}
144
145static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
146{
147	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
148	union acpi_object *obj;
149	struct acpi_subtable_header *header;
150	int apic_id = -1;
151
152	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
153		goto exit;
154
155	if (!buffer.length || !buffer.pointer)
156		goto exit;
157
158	obj = buffer.pointer;
159	if (obj->type != ACPI_TYPE_BUFFER ||
160	    obj->buffer.length < sizeof(struct acpi_subtable_header)) {
161		goto exit;
162	}
163
164	header = (struct acpi_subtable_header *)obj->buffer.pointer;
165	if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
166		map_lapic_id(header, acpi_id, &apic_id);
167	} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
168		map_lsapic_id(header, type, acpi_id, &apic_id);
169	}
170
171exit:
172	if (buffer.pointer)
173		kfree(buffer.pointer);
174	return apic_id;
175}
176
177int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
178{
179	int i;
180	int apic_id = -1;
181
182	apic_id = map_mat_entry(handle, type, acpi_id);
183	if (apic_id == -1)
184		apic_id = map_madt_entry(type, acpi_id);
185	if (apic_id == -1)
186		return apic_id;
187
188	for_each_possible_cpu(i) {
189		if (cpu_physical_id(i) == apic_id)
190			return i;
191	}
192	return -1;
193}
194EXPORT_SYMBOL_GPL(acpi_get_cpuid);
195#endif
196
197
198static void acpi_set_pdc_bits(u32 *buf)
199{
200	buf[0] = ACPI_PDC_REVISION_ID;
201	buf[1] = 1;
202
203	/* Enable coordination with firmware's _TSD info */
204	buf[2] = ACPI_PDC_SMP_T_SWCOORD;
205
206	/* Twiddle arch-specific bits needed for _PDC */
207	arch_acpi_set_pdc_bits(buf);
208}
209
210static struct acpi_object_list *acpi_processor_alloc_pdc(void)
211{
212	struct acpi_object_list *obj_list;
213	union acpi_object *obj;
214	u32 *buf;
215
216	/* allocate and initialize pdc. It will be used later. */
217	obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
218	if (!obj_list) {
219		printk(KERN_ERR "Memory allocation error\n");
220		return NULL;
221	}
222
223	obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
224	if (!obj) {
225		printk(KERN_ERR "Memory allocation error\n");
226		kfree(obj_list);
227		return NULL;
228	}
229
230	buf = kmalloc(12, GFP_KERNEL);
231	if (!buf) {
232		printk(KERN_ERR "Memory allocation error\n");
233		kfree(obj);
234		kfree(obj_list);
235		return NULL;
236	}
237
238	acpi_set_pdc_bits(buf);
239
240	obj->type = ACPI_TYPE_BUFFER;
241	obj->buffer.length = 12;
242	obj->buffer.pointer = (u8 *) buf;
243	obj_list->count = 1;
244	obj_list->pointer = obj;
245
246	return obj_list;
247}
248
249/*
250 * _PDC is required for a BIOS-OS handshake for most of the newer
251 * ACPI processor features.
252 */
253static int
254acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
255{
256	acpi_status status = AE_OK;
257
258	if (idle_nomwait) {
259		/*
260		 * If mwait is disabled for CPU C-states, the C2C3_FFH access
261		 * mode will be disabled in the parameter of _PDC object.
262		 * Of course C1_FFH access mode will also be disabled.
263		 */
264		union acpi_object *obj;
265		u32 *buffer = NULL;
266
267		obj = pdc_in->pointer;
268		buffer = (u32 *)(obj->buffer.pointer);
269		buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
270
271	}
272	status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
273
274	if (ACPI_FAILURE(status))
275		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
276		    "Could not evaluate _PDC, using legacy perf. control.\n"));
277
278	return status;
279}
280
281static int early_pdc_done;
282
283void acpi_processor_set_pdc(acpi_handle handle)
284{
285	struct acpi_object_list *obj_list;
286
287	if (arch_has_acpi_pdc() == false)
288		return;
289
290	if (early_pdc_done)
291		return;
292
293	obj_list = acpi_processor_alloc_pdc();
294	if (!obj_list)
295		return;
296
297	acpi_processor_eval_pdc(handle, obj_list);
298
299	kfree(obj_list->pointer->buffer.pointer);
300	kfree(obj_list->pointer);
301	kfree(obj_list);
302}
303EXPORT_SYMBOL_GPL(acpi_processor_set_pdc);
304
305static int early_pdc_optin;
306static int set_early_pdc_optin(const struct dmi_system_id *id)
307{
308	early_pdc_optin = 1;
309	return 0;
310}
311
312static int param_early_pdc_optin(char *s)
313{
314	early_pdc_optin = 1;
315	return 1;
316}
317__setup("acpi_early_pdc_eval", param_early_pdc_optin);
318
319static struct dmi_system_id __cpuinitdata early_pdc_optin_table[] = {
320	{
321	set_early_pdc_optin, "HP Envy", {
322	DMI_MATCH(DMI_BIOS_VENDOR, "Hewlett-Packard"),
323	DMI_MATCH(DMI_PRODUCT_NAME, "HP Envy") }, NULL},
324	{
325	set_early_pdc_optin, "HP Pavilion dv6", {
326	DMI_MATCH(DMI_BIOS_VENDOR, "Hewlett-Packard"),
327	DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dv6") }, NULL},
328	{
329	set_early_pdc_optin, "HP Pavilion dv7", {
330	DMI_MATCH(DMI_BIOS_VENDOR, "Hewlett-Packard"),
331	DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dv7") }, NULL},
332	{},
333};
334
335static acpi_status
336early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
337{
338	acpi_processor_set_pdc(handle);
339	return AE_OK;
340}
341
342void __init acpi_early_processor_set_pdc(void)
343{
344
345#ifdef CONFIG_SMP
346	if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
347				(struct acpi_table_header **)&madt)))
348		madt = NULL;
349#endif
350
351	/*
352	 * Check whether the system is DMI table. If yes, OSPM
353	 * should not use mwait for CPU-states.
354	 */
355	dmi_check_system(processor_idle_dmi_table);
356
357	/*
358	 * Allow systems to opt-in to early _PDC evaluation.
359	 */
360	dmi_check_system(early_pdc_optin_table);
361	if (!early_pdc_optin)
362		return;
363
364	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
365			    ACPI_UINT32_MAX,
366			    early_init_pdc, NULL, NULL, NULL);
367
368	early_pdc_done = 1;
369}
370