processor_core.c revision 11130736c99c37e253f45b2d3fd30b07313f83c6 
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
54	if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
55		return 0;
56
57	if (lapic->processor_id != acpi_id)
58		return 0;
59
60	*apic_id = lapic->id;
61	return 1;
62}
63
64static int map_x2apic_id(struct acpi_subtable_header *entry,
65			 int device_declaration, u32 acpi_id, int *apic_id)
66{
67	struct acpi_madt_local_x2apic *apic =
68		(struct acpi_madt_local_x2apic *)entry;
69	u32 tmp = apic->local_apic_id;
70
71	/* Only check enabled APICs*/
72	if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
73		return 0;
74
75	/* Device statement declaration type */
76	if (device_declaration) {
77		if (apic->uid == acpi_id)
78			goto found;
79	}
80
81	return 0;
82found:
83	*apic_id = tmp;
84	return 1;
85}
86
87static int map_lsapic_id(struct acpi_subtable_header *entry,
88		int device_declaration, u32 acpi_id, int *apic_id)
89{
90	struct acpi_madt_local_sapic *lsapic =
91		(struct acpi_madt_local_sapic *)entry;
92	u32 tmp = (lsapic->id << 8) | lsapic->eid;
93
94	/* Only check enabled APICs*/
95	if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
96		return 0;
97
98	/* Device statement declaration type */
99	if (device_declaration) {
100		if (entry->length < 16)
101			printk(KERN_ERR PREFIX
102			    "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
103			    tmp);
104		else if (lsapic->uid == acpi_id)
105			goto found;
106	/* Processor statement declaration type */
107	} else if (lsapic->processor_id == acpi_id)
108		goto found;
109
110	return 0;
111found:
112	*apic_id = tmp;
113	return 1;
114}
115
116static int map_madt_entry(int type, u32 acpi_id)
117{
118	unsigned long madt_end, entry;
119	int apic_id = -1;
120
121	if (!madt)
122		return apic_id;
123
124	entry = (unsigned long)madt;
125	madt_end = entry + madt->header.length;
126
127	/* Parse all entries looking for a match. */
128
129	entry += sizeof(struct acpi_table_madt);
130	while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
131		struct acpi_subtable_header *header =
132			(struct acpi_subtable_header *)entry;
133		if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
134			if (map_lapic_id(header, acpi_id, &apic_id))
135				break;
136		} else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
137			if (map_x2apic_id(header, type, acpi_id, &apic_id))
138				break;
139		} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
140			if (map_lsapic_id(header, type, acpi_id, &apic_id))
141				break;
142		}
143		entry += header->length;
144	}
145	return apic_id;
146}
147
148static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
149{
150	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
151	union acpi_object *obj;
152	struct acpi_subtable_header *header;
153	int apic_id = -1;
154
155	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
156		goto exit;
157
158	if (!buffer.length || !buffer.pointer)
159		goto exit;
160
161	obj = buffer.pointer;
162	if (obj->type != ACPI_TYPE_BUFFER ||
163	    obj->buffer.length < sizeof(struct acpi_subtable_header)) {
164		goto exit;
165	}
166
167	header = (struct acpi_subtable_header *)obj->buffer.pointer;
168	if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
169		map_lapic_id(header, acpi_id, &apic_id);
170	} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
171		map_lsapic_id(header, type, acpi_id, &apic_id);
172	}
173
174exit:
175	if (buffer.pointer)
176		kfree(buffer.pointer);
177	return apic_id;
178}
179
180int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
181{
182	int i;
183	int apic_id = -1;
184
185	apic_id = map_mat_entry(handle, type, acpi_id);
186	if (apic_id == -1)
187		apic_id = map_madt_entry(type, acpi_id);
188	if (apic_id == -1)
189		return apic_id;
190
191	for_each_possible_cpu(i) {
192		if (cpu_physical_id(i) == apic_id)
193			return i;
194	}
195	return -1;
196}
197EXPORT_SYMBOL_GPL(acpi_get_cpuid);
198#endif
199
200static bool processor_physically_present(acpi_handle handle)
201{
202	int cpuid, type;
203	u32 acpi_id;
204	acpi_status status;
205	acpi_object_type acpi_type;
206	unsigned long long tmp;
207	union acpi_object object = { 0 };
208	struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
209
210	status = acpi_get_type(handle, &acpi_type);
211	if (ACPI_FAILURE(status))
212		return false;
213
214	switch (acpi_type) {
215	case ACPI_TYPE_PROCESSOR:
216		status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
217		if (ACPI_FAILURE(status))
218			return false;
219		acpi_id = object.processor.proc_id;
220		break;
221	case ACPI_TYPE_DEVICE:
222		status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
223		if (ACPI_FAILURE(status))
224			return false;
225		acpi_id = tmp;
226		break;
227	default:
228		return false;
229	}
230
231	type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
232	cpuid = acpi_get_cpuid(handle, type, acpi_id);
233
234	if (cpuid == -1)
235		return false;
236
237	return true;
238}
239
240static void acpi_set_pdc_bits(u32 *buf)
241{
242	buf[0] = ACPI_PDC_REVISION_ID;
243	buf[1] = 1;
244
245	/* Enable coordination with firmware's _TSD info */
246	buf[2] = ACPI_PDC_SMP_T_SWCOORD;
247
248	/* Twiddle arch-specific bits needed for _PDC */
249	arch_acpi_set_pdc_bits(buf);
250}
251
252static struct acpi_object_list *acpi_processor_alloc_pdc(void)
253{
254	struct acpi_object_list *obj_list;
255	union acpi_object *obj;
256	u32 *buf;
257
258	/* allocate and initialize pdc. It will be used later. */
259	obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
260	if (!obj_list) {
261		printk(KERN_ERR "Memory allocation error\n");
262		return NULL;
263	}
264
265	obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
266	if (!obj) {
267		printk(KERN_ERR "Memory allocation error\n");
268		kfree(obj_list);
269		return NULL;
270	}
271
272	buf = kmalloc(12, GFP_KERNEL);
273	if (!buf) {
274		printk(KERN_ERR "Memory allocation error\n");
275		kfree(obj);
276		kfree(obj_list);
277		return NULL;
278	}
279
280	acpi_set_pdc_bits(buf);
281
282	obj->type = ACPI_TYPE_BUFFER;
283	obj->buffer.length = 12;
284	obj->buffer.pointer = (u8 *) buf;
285	obj_list->count = 1;
286	obj_list->pointer = obj;
287
288	return obj_list;
289}
290
291/*
292 * _PDC is required for a BIOS-OS handshake for most of the newer
293 * ACPI processor features.
294 */
295static int
296acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
297{
298	acpi_status status = AE_OK;
299
300	if (idle_nomwait) {
301		/*
302		 * If mwait is disabled for CPU C-states, the C2C3_FFH access
303		 * mode will be disabled in the parameter of _PDC object.
304		 * Of course C1_FFH access mode will also be disabled.
305		 */
306		union acpi_object *obj;
307		u32 *buffer = NULL;
308
309		obj = pdc_in->pointer;
310		buffer = (u32 *)(obj->buffer.pointer);
311		buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
312
313	}
314	status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
315
316	if (ACPI_FAILURE(status))
317		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
318		    "Could not evaluate _PDC, using legacy perf. control.\n"));
319
320	return status;
321}
322
323void acpi_processor_set_pdc(acpi_handle handle)
324{
325	struct acpi_object_list *obj_list;
326
327	if (arch_has_acpi_pdc() == false)
328		return;
329
330	obj_list = acpi_processor_alloc_pdc();
331	if (!obj_list)
332		return;
333
334	acpi_processor_eval_pdc(handle, obj_list);
335
336	kfree(obj_list->pointer->buffer.pointer);
337	kfree(obj_list->pointer);
338	kfree(obj_list);
339}
340EXPORT_SYMBOL_GPL(acpi_processor_set_pdc);
341
342static acpi_status
343early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
344{
345	if (processor_physically_present(handle) == false)
346		return AE_OK;
347
348	acpi_processor_set_pdc(handle);
349	return AE_OK;
350}
351
352void __init acpi_early_processor_set_pdc(void)
353{
354
355#ifdef CONFIG_SMP
356	if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
357				(struct acpi_table_header **)&madt)))
358		madt = NULL;
359#endif
360
361	/*
362	 * Check whether the system is DMI table. If yes, OSPM
363	 * should not use mwait for CPU-states.
364	 */
365	dmi_check_system(processor_idle_dmi_table);
366
367	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
368			    ACPI_UINT32_MAX,
369			    early_init_pdc, NULL, NULL, NULL);
370}
371