[mirror_ubuntu-bionic-kernel.git] / arch / x86 / kernel / ds.c

/*
 * Debug Store support
 *
 * This provides a low-level interface to the hardware's Debug Store
 * feature that is used for last branch recording (LBR) and
 * precise-event based sampling (PEBS).
 *
 * Different architectures use a different DS layout/pointer size.
 * The below functions therefore work on a void*.
 *
 *
 * Since there is no user for PEBS, yet, only LBR (or branch
 * trace store, BTS) is supported.
 *
 *
 * Copyright (C) 2007 Intel Corporation.
 * Markus Metzger <markus.t.metzger@intel.com>, Dec 2007
 */

#include <asm/ds.h>

#include <linux/errno.h>
#include <linux/string.h>
#include <linux/slab.h>


/*
 * Debug Store (DS) save area configuration (see Intel64 and IA32
 * Architectures Software Developer's Manual, section 18.5)
 *
 * The DS configuration consists of the following fields; different
 * architetures vary in the size of those fields.
 * - double-word aligned base linear address of the BTS buffer
 * - write pointer into the BTS buffer
 * - end linear address of the BTS buffer (one byte beyond the end of
 *   the buffer)
 * - interrupt pointer into BTS buffer
 *   (interrupt occurs when write pointer passes interrupt pointer)
 * - double-word aligned base linear address of the PEBS buffer
 * - write pointer into the PEBS buffer
 * - end linear address of the PEBS buffer (one byte beyond the end of
 *   the buffer)
 * - interrupt pointer into PEBS buffer
 *   (interrupt occurs when write pointer passes interrupt pointer)
 * - value to which counter is reset following counter overflow
 *
 * On later architectures, the last branch recording hardware uses
 * 64bit pointers even in 32bit mode.
 *
 *
 * Branch Trace Store (BTS) records store information about control
 * flow changes. They at least provide the following information:
 * - source linear address
 * - destination linear address
 *
 * Netburst supported a predicated bit that had been dropped in later
 * architectures. We do not suppor it.
 *
 *
 * In order to abstract from the actual DS and BTS layout, we describe
 * the access to the relevant fields.
 * Thanks to Andi Kleen for proposing this design.
 *
 * The implementation, however, is not as general as it might seem. In
 * order to stay somewhat simple and efficient, we assume an
 * underlying unsigned type (mostly a pointer type) and we expect the
 * field to be at least as big as that type.
 */

/*
 * A special from_ip address to indicate that the BTS record is an
 * info record that needs to be interpreted or skipped.
 */
#define BTS_ESCAPE_ADDRESS (-1)

/*
 * A field access descriptor
 */
struct access_desc {
	unsigned char offset;
	unsigned char size;
};

/*
 * The configuration for a particular DS/BTS hardware implementation.
 */
struct ds_configuration {
	/* the DS configuration */
	unsigned char  sizeof_ds;
	struct access_desc bts_buffer_base;
	struct access_desc bts_index;
	struct access_desc bts_absolute_maximum;
	struct access_desc bts_interrupt_threshold;
	/* the BTS configuration */
	unsigned char  sizeof_bts;
	struct access_desc from_ip;
	struct access_desc to_ip;
	/* BTS variants used to store additional information like
	   timestamps */
	struct access_desc info_type;
	struct access_desc info_data;
	unsigned long debugctl_mask;
};

/*
 * The global configuration used by the below accessor functions
 */
static struct ds_configuration ds_cfg;

/*
 * Accessor functions for some DS and BTS fields using the above
 * global ptrace_bts_cfg.
 */
static inline void *get_bts_buffer_base(char *base)
{
	return *(void **)(base + ds_cfg.bts_buffer_base.offset);
}
static inline void set_bts_buffer_base(char *base, void *value)
{
	(*(void **)(base + ds_cfg.bts_buffer_base.offset)) = value;
}
static inline void *get_bts_index(char *base)
{
	return *(void **)(base + ds_cfg.bts_index.offset);
}
static inline void set_bts_index(char *base, void *value)
{
	(*(void **)(base + ds_cfg.bts_index.offset)) = value;
}
static inline void *get_bts_absolute_maximum(char *base)
{
	return *(void **)(base + ds_cfg.bts_absolute_maximum.offset);
}
static inline void set_bts_absolute_maximum(char *base, void *value)
{
	(*(void **)(base + ds_cfg.bts_absolute_maximum.offset)) = value;
}
static inline void *get_bts_interrupt_threshold(char *base)
{
	return *(void **)(base + ds_cfg.bts_interrupt_threshold.offset);
}
static inline void set_bts_interrupt_threshold(char *base, void *value)
{
	(*(void **)(base + ds_cfg.bts_interrupt_threshold.offset)) = value;
}
static inline long get_from_ip(char *base)
{
	return *(long *)(base + ds_cfg.from_ip.offset);
}
static inline void set_from_ip(char *base, long value)
{
	(*(long *)(base + ds_cfg.from_ip.offset)) = value;
}
static inline long get_to_ip(char *base)
{
	return *(long *)(base + ds_cfg.to_ip.offset);
}
static inline void set_to_ip(char *base, long value)
{
	(*(long *)(base + ds_cfg.to_ip.offset)) = value;
}
static inline unsigned char get_info_type(char *base)
{
	return *(unsigned char *)(base + ds_cfg.info_type.offset);
}
static inline void set_info_type(char *base, unsigned char value)
{
	(*(unsigned char *)(base + ds_cfg.info_type.offset)) = value;
}
/*
 * The info data might overlap with the info type on some architectures.
 * We therefore read and write the exact number of bytes.
 */
static inline unsigned long long get_info_data(char *base)
{
	unsigned long long value = 0;
	memcpy(&value,
	       base + ds_cfg.info_data.offset,
	       ds_cfg.info_data.size);
	return value;
}
static inline void set_info_data(char *base, unsigned long long value)
{
	memcpy(base + ds_cfg.info_data.offset,
	       &value,
	       ds_cfg.info_data.size);
}


int ds_allocate(void **dsp, size_t bts_size_in_records)
{
	size_t bts_size_in_bytes = 0;
	void *bts = 0;
	void *ds = 0;

	if (!ds_cfg.sizeof_ds || !ds_cfg.sizeof_bts)
		return -EOPNOTSUPP;

	if (bts_size_in_records < 0)
		return -EINVAL;

	bts_size_in_bytes =
		bts_size_in_records * ds_cfg.sizeof_bts;

	if (bts_size_in_bytes <= 0)
		return -EINVAL;

	bts = kzalloc(bts_size_in_bytes, GFP_KERNEL);

	if (!bts)
		return -ENOMEM;

	ds = kzalloc(ds_cfg.sizeof_ds, GFP_KERNEL);

	if (!ds) {
		kfree(bts);
		return -ENOMEM;
	}

	set_bts_buffer_base(ds, bts);
	set_bts_index(ds, bts);
	set_bts_absolute_maximum(ds, bts + bts_size_in_bytes);
	set_bts_interrupt_threshold(ds, bts + bts_size_in_bytes + 1);

	*dsp = ds;
	return 0;
}

int ds_free(void **dsp)
{
	if (*dsp)
		kfree(get_bts_buffer_base(*dsp));
	kfree(*dsp);
	*dsp = 0;

	return 0;
}

int ds_get_bts_size(void *ds)
{
	size_t size_in_bytes;

	if (!ds_cfg.sizeof_ds || !ds_cfg.sizeof_bts)
		return -EOPNOTSUPP;

	size_in_bytes =
		get_bts_absolute_maximum(ds) -
		get_bts_buffer_base(ds);

	return size_in_bytes / ds_cfg.sizeof_bts;
}

int ds_get_bts_index(void *ds)
{
	size_t index_offset_in_bytes;

	if (!ds_cfg.sizeof_ds || !ds_cfg.sizeof_bts)
		return -EOPNOTSUPP;

	index_offset_in_bytes =
		get_bts_index(ds) -
		get_bts_buffer_base(ds);

	return index_offset_in_bytes / ds_cfg.sizeof_bts;
}

int ds_read_bts(void *ds, size_t index, struct bts_struct *out)
{
	void *bts;

	if (!ds_cfg.sizeof_ds || !ds_cfg.sizeof_bts)
		return -EOPNOTSUPP;

	if (index < 0)
		return -EINVAL;

	if (index >= ds_get_bts_size(ds))
		return -EINVAL;

	bts = get_bts_buffer_base(ds);
	bts = (char *)bts + (index * ds_cfg.sizeof_bts);

	memset(out, 0, sizeof(*out));
	if (get_from_ip(bts) == BTS_ESCAPE_ADDRESS) {
		out->qualifier         = get_info_type(bts);
		out->variant.timestamp = get_info_data(bts);
	} else {
		out->qualifier = BTS_BRANCH;
		out->variant.lbr.from_ip = get_from_ip(bts);
		out->variant.lbr.to_ip   = get_to_ip(bts);
	}

	return 0;
}

int ds_write_bts(void *ds, const struct bts_struct *in)
{
	void *bts;

	if (!ds_cfg.sizeof_ds || !ds_cfg.sizeof_bts)
		return -EOPNOTSUPP;

	if (ds_get_bts_size(ds) <= 0)
		return -ENXIO;

	bts = get_bts_index(ds);

	memset(bts, 0, ds_cfg.sizeof_bts);
	switch (in->qualifier) {
	case BTS_INVALID:
		break;

	case BTS_BRANCH:
		set_from_ip(bts, in->variant.lbr.from_ip);
		set_to_ip(bts, in->variant.lbr.to_ip);
		break;

	case BTS_TASK_ARRIVES:
	case BTS_TASK_DEPARTS:
		set_from_ip(bts, BTS_ESCAPE_ADDRESS);
		set_info_type(bts, in->qualifier);
		set_info_data(bts, in->variant.timestamp);
		break;

	default:
		return -EINVAL;
	}

	bts = (char *)bts + ds_cfg.sizeof_bts;
	if (bts >= get_bts_absolute_maximum(ds))
		bts = get_bts_buffer_base(ds);
	set_bts_index(ds, bts);

	return 0;
}

unsigned long ds_debugctl_mask(void)
{
	return ds_cfg.debugctl_mask;
}

#ifdef __i386__
static const struct ds_configuration ds_cfg_netburst = {
	.sizeof_ds = 9 * 4,
	.bts_buffer_base = { 0, 4 },
	.bts_index = { 4, 4 },
	.bts_absolute_maximum = { 8, 4 },
	.bts_interrupt_threshold = { 12, 4 },
	.sizeof_bts = 3 * 4,
	.from_ip = { 0, 4 },
	.to_ip = { 4, 4 },
	.info_type = { 4, 1 },
	.info_data = { 5, 7 },
	.debugctl_mask = (1<<2)|(1<<3)
};

static const struct ds_configuration ds_cfg_pentium_m = {
	.sizeof_ds = 9 * 4,
	.bts_buffer_base = { 0, 4 },
	.bts_index = { 4, 4 },
	.bts_absolute_maximum = { 8, 4 },
	.bts_interrupt_threshold = { 12, 4 },
	.sizeof_bts = 3 * 4,
	.from_ip = { 0, 4 },
	.to_ip = { 4, 4 },
	.info_type = { 4, 1 },
	.info_data = { 5, 7 },
	.debugctl_mask = (1<<6)|(1<<7)
};
#endif /* _i386_ */

static const struct ds_configuration ds_cfg_core2 = {
	.sizeof_ds = 9 * 8,
	.bts_buffer_base = { 0, 8 },
	.bts_index = { 8, 8 },
	.bts_absolute_maximum = { 16, 8 },
	.bts_interrupt_threshold = { 24, 8 },
	.sizeof_bts = 3 * 8,
	.from_ip = { 0, 8 },
	.to_ip = { 8, 8 },
	.info_type = { 8, 1 },
	.info_data = { 9, 7 },
	.debugctl_mask = (1<<6)|(1<<7)|(1<<9)
};

static inline void
ds_configure(const struct ds_configuration *cfg)
{
	ds_cfg = *cfg;
}

void __cpuinit ds_init_intel(struct cpuinfo_x86 *c)
{
	switch (c->x86) {
	case 0x6:
		switch (c->x86_model) {
#ifdef __i386__
		case 0xD:
		case 0xE: /* Pentium M */
			ds_configure(&ds_cfg_pentium_m);
			break;
#endif /* _i386_ */
		case 0xF: /* Core2 */
			ds_configure(&ds_cfg_core2);
			break;
		default:
			/* sorry, don't know about them */
			break;
		}
		break;
	case 0xF:
		switch (c->x86_model) {
#ifdef __i386__
		case 0x0:
		case 0x1:
		case 0x2: /* Netburst */
			ds_configure(&ds_cfg_netburst);
			break;
#endif /* _i386_ */
		default:
			/* sorry, don't know about them */
			break;
		}
		break;
	default:
		/* sorry, don't know about them */
		break;
	}
}
Commit	Line	Data
eee3af4a MM	1	/*
	2	* Debug Store support
	3	*
	4	* This provides a low-level interface to the hardware's Debug Store
	5	* feature that is used for last branch recording (LBR) and
	6	* precise-event based sampling (PEBS).
	7	*
	8	* Different architectures use a different DS layout/pointer size.
	9	* The below functions therefore work on a void*.
	10	*
	11	*
	12	* Since there is no user for PEBS, yet, only LBR (or branch
	13	* trace store, BTS) is supported.
	14	*
	15	*
	16	* Copyright (C) 2007 Intel Corporation.
	17	* Markus Metzger <markus.t.metzger@intel.com>, Dec 2007
	18	*/
	19
	20	#include <asm/ds.h>
	21
	22	#include <linux/errno.h>
	23	#include <linux/string.h>
	24	#include <linux/slab.h>
	25
	26
	27	/*
	28	* Debug Store (DS) save area configuration (see Intel64 and IA32
	29	* Architectures Software Developer's Manual, section 18.5)
	30	*
	31	* The DS configuration consists of the following fields; different
	32	* architetures vary in the size of those fields.
	33	* - double-word aligned base linear address of the BTS buffer
	34	* - write pointer into the BTS buffer
	35	* - end linear address of the BTS buffer (one byte beyond the end of
	36	* the buffer)
	37	* - interrupt pointer into BTS buffer
	38	* (interrupt occurs when write pointer passes interrupt pointer)
	39	* - double-word aligned base linear address of the PEBS buffer
	40	* - write pointer into the PEBS buffer
	41	* - end linear address of the PEBS buffer (one byte beyond the end of
	42	* the buffer)
	43	* - interrupt pointer into PEBS buffer
	44	* (interrupt occurs when write pointer passes interrupt pointer)
	45	* - value to which counter is reset following counter overflow
	46	*
	47	* On later architectures, the last branch recording hardware uses
	48	* 64bit pointers even in 32bit mode.
	49	*
	50	*
	51	* Branch Trace Store (BTS) records store information about control
	52	* flow changes. They at least provide the following information:
	53	* - source linear address
	54	* - destination linear address
	55	*
	56	* Netburst supported a predicated bit that had been dropped in later
	57	* architectures. We do not suppor it.
	58	*
	59	*
	60	* In order to abstract from the actual DS and BTS layout, we describe
	61	* the access to the relevant fields.
	62	* Thanks to Andi Kleen for proposing this design.
	63	*
	64	* The implementation, however, is not as general as it might seem. In
65	* order to stay somewhat simple and efficient, we assume an
66	* underlying unsigned type (mostly a pointer type) and we expect the
67	* field to be at least as big as that type.
68	*/
69
70	/*
71	* A special from_ip address to indicate that the BTS record is an
72	* info record that needs to be interpreted or skipped.
73	*/
74	#define BTS_ESCAPE_ADDRESS (-1)
75
76	/*
77	* A field access descriptor
78	*/
79	struct access_desc {
80	unsigned char offset;
81	unsigned char size;
82	};
83
84	/*
85	* The configuration for a particular DS/BTS hardware implementation.
86	*/
87	struct ds_configuration {
88	/* the DS configuration */
89	unsigned char sizeof_ds;
90	struct access_desc bts_buffer_base;
91	struct access_desc bts_index;
92	struct access_desc bts_absolute_maximum;
93	struct access_desc bts_interrupt_threshold;
94	/* the BTS configuration */
95	unsigned char sizeof_bts;
96	struct access_desc from_ip;
97	struct access_desc to_ip;
98	/* BTS variants used to store additional information like
99	timestamps */
100	struct access_desc info_type;
101	struct access_desc info_data;
102	unsigned long debugctl_mask;
103	};
104
105	/*
106	* The global configuration used by the below accessor functions
107	*/
108	static struct ds_configuration ds_cfg;
109
110	/*
111	* Accessor functions for some DS and BTS fields using the above
112	* global ptrace_bts_cfg.
113	*/
114	static inline void get_bts_buffer_base(char base)
115	{
116	return (void *)(base + ds_cfg.bts_buffer_base.offset);
117	}
118	static inline void set_bts_buffer_base(char base, void value)
119	{
120	((void *)(base + ds_cfg.bts_buffer_base.offset)) = value;
121	}
122	static inline void get_bts_index(char base)
123	{
124	return (void *)(base + ds_cfg.bts_index.offset);
125	}
126	static inline void set_bts_index(char base, void value)
127	{
128	((void *)(base + ds_cfg.bts_index.offset)) = value;
129	}
130	static inline void get_bts_absolute_maximum(char base)
131	{
132	return (void *)(base + ds_cfg.bts_absolute_maximum.offset);
133	}
134	static inline void set_bts_absolute_maximum(char base, void value)
135	{
136	((void *)(base + ds_cfg.bts_absolute_maximum.offset)) = value;
137	}
138	static inline void get_bts_interrupt_threshold(char base)
139	{
140	return (void *)(base + ds_cfg.bts_interrupt_threshold.offset);
141	}
142	static inline void set_bts_interrupt_threshold(char base, void value)
143	{
144	((void *)(base + ds_cfg.bts_interrupt_threshold.offset)) = value;
145	}
146	static inline long get_from_ip(char *base)
147	{
148	return (long )(base + ds_cfg.from_ip.offset);
149	}
150	static inline void set_from_ip(char *base, long value)
151	{
152	((long )(base + ds_cfg.from_ip.offset)) = value;
153	}
154	static inline long get_to_ip(char *base)
155	{
156	return (long )(base + ds_cfg.to_ip.offset);
157	}
158	static inline void set_to_ip(char *base, long value)
159	{
160	((long )(base + ds_cfg.to_ip.offset)) = value;
161	}
162	static inline unsigned char get_info_type(char *base)
163	{
164	return (unsigned char )(base + ds_cfg.info_type.offset);
165	}
166	static inline void set_info_type(char *base, unsigned char value)
167	{
168	((unsigned char )(base + ds_cfg.info_type.offset)) = value;
169	}
170	/*
171	* The info data might overlap with the info type on some architectures.
172	* We therefore read and write the exact number of bytes.
173	*/
174	static inline unsigned long long get_info_data(char *base)
175	{
176	unsigned long long value = 0;
177	memcpy(&value,
178	base + ds_cfg.info_data.offset,
179	ds_cfg.info_data.size);
180	return value;
181	}
182	static inline void set_info_data(char *base, unsigned long long value)
183	{
184	memcpy(base + ds_cfg.info_data.offset,
185	&value,
186	ds_cfg.info_data.size);
187	}
188
189
190	int ds_allocate(void **dsp, size_t bts_size_in_records)
191	{
192	size_t bts_size_in_bytes = 0;
193	void *bts = 0;
194	void *ds = 0;
195
196	if (!ds_cfg.sizeof_ds \|\| !ds_cfg.sizeof_bts)
197	return -EOPNOTSUPP;
198
199	if (bts_size_in_records < 0)
200	return -EINVAL;
201
202	bts_size_in_bytes =
203	bts_size_in_records * ds_cfg.sizeof_bts;
204
205	if (bts_size_in_bytes <= 0)
206	return -EINVAL;
207
208	bts = kzalloc(bts_size_in_bytes, GFP_KERNEL);
209
210	if (!bts)
211	return -ENOMEM;
212
213	ds = kzalloc(ds_cfg.sizeof_ds, GFP_KERNEL);
214
215	if (!ds) {
216	kfree(bts);
217	return -ENOMEM;
218	}
219
220	set_bts_buffer_base(ds, bts);
221	set_bts_index(ds, bts);
222	set_bts_absolute_maximum(ds, bts + bts_size_in_bytes);
223	set_bts_interrupt_threshold(ds, bts + bts_size_in_bytes + 1);
224
225	*dsp = ds;
226	return 0;
227	}
228
229	int ds_free(void **dsp)
230	{
231	if (*dsp)
232	kfree(get_bts_buffer_base(*dsp));
233	kfree(*dsp);
234	*dsp = 0;
235
236	return 0;
237	}
238
239	int ds_get_bts_size(void *ds)
240	{
241	size_t size_in_bytes;
242
243	if (!ds_cfg.sizeof_ds \|\| !ds_cfg.sizeof_bts)
244	return -EOPNOTSUPP;
245
246	size_in_bytes =
247	get_bts_absolute_maximum(ds) -
248	get_bts_buffer_base(ds);
249
250	return size_in_bytes / ds_cfg.sizeof_bts;
251	}
252
253	int ds_get_bts_index(void *ds)
254	{
255	size_t index_offset_in_bytes;
256
257	if (!ds_cfg.sizeof_ds \|\| !ds_cfg.sizeof_bts)
258	return -EOPNOTSUPP;
259
260	index_offset_in_bytes =
261	get_bts_index(ds) -
262	get_bts_buffer_base(ds);
263
264	return index_offset_in_bytes / ds_cfg.sizeof_bts;
265	}
266
267	int ds_read_bts(void ds, size_t index, struct bts_struct out)
268	{
269	void *bts;
270
271	if (!ds_cfg.sizeof_ds \|\| !ds_cfg.sizeof_bts)
272	return -EOPNOTSUPP;
273
274	if (index < 0)
275	return -EINVAL;
276
277	if (index >= ds_get_bts_size(ds))
278	return -EINVAL;
279
280	bts = get_bts_buffer_base(ds);
281	bts = (char )bts + (index ds_cfg.sizeof_bts);
282
283	memset(out, 0, sizeof(*out));
284	if (get_from_ip(bts) == BTS_ESCAPE_ADDRESS) {
285	out->qualifier = get_info_type(bts);
286	out->variant.timestamp = get_info_data(bts);
287	} else {
288	out->qualifier = BTS_BRANCH;
289	out->variant.lbr.from_ip = get_from_ip(bts);
290	out->variant.lbr.to_ip = get_to_ip(bts);
291	}
292
293	return 0;
294	}
295
296	int ds_write_bts(void ds, const struct bts_struct in)
297	{
298	void *bts;
299
300	if (!ds_cfg.sizeof_ds \|\| !ds_cfg.sizeof_bts)
301	return -EOPNOTSUPP;
302
303	if (ds_get_bts_size(ds) <= 0)
304	return -ENXIO;
305
306	bts = get_bts_index(ds);
307
308	memset(bts, 0, ds_cfg.sizeof_bts);
309	switch (in->qualifier) {
310	case BTS_INVALID:
311	break;
312
313	case BTS_BRANCH:
314	set_from_ip(bts, in->variant.lbr.from_ip);
315	set_to_ip(bts, in->variant.lbr.to_ip);
316	break;
317
318	case BTS_TASK_ARRIVES:
319	case BTS_TASK_DEPARTS:
320	set_from_ip(bts, BTS_ESCAPE_ADDRESS);
321	set_info_type(bts, in->qualifier);
322	set_info_data(bts, in->variant.timestamp);
323	break;
324
325	default:
326	return -EINVAL;
327	}
328
329	bts = (char *)bts + ds_cfg.sizeof_bts;
330	if (bts >= get_bts_absolute_maximum(ds))
331	bts = get_bts_buffer_base(ds);
332	set_bts_index(ds, bts);
333
334	return 0;
335	}
336
337	unsigned long ds_debugctl_mask(void)
338	{
339	return ds_cfg.debugctl_mask;
340	}
341
342	#ifdef __i386__
343	static const struct ds_configuration ds_cfg_netburst = {
344	.sizeof_ds = 9 * 4,
345	.bts_buffer_base = { 0, 4 },
346	.bts_index = { 4, 4 },
347	.bts_absolute_maximum = { 8, 4 },
348	.bts_interrupt_threshold = { 12, 4 },
349	.sizeof_bts = 3 * 4,
350	.from_ip = { 0, 4 },
351	.to_ip = { 4, 4 },
352	.info_type = { 4, 1 },
353	.info_data = { 5, 7 },
354	.debugctl_mask = (1<<2)\|(1<<3)
355	};
356
357	static const struct ds_configuration ds_cfg_pentium_m = {
358	.sizeof_ds = 9 * 4,
359	.bts_buffer_base = { 0, 4 },
360	.bts_index = { 4, 4 },
361	.bts_absolute_maximum = { 8, 4 },
362	.bts_interrupt_threshold = { 12, 4 },
363	.sizeof_bts = 3 * 4,
364	.from_ip = { 0, 4 },
365	.to_ip = { 4, 4 },
366	.info_type = { 4, 1 },
367	.info_data = { 5, 7 },
368	.debugctl_mask = (1<<6)\|(1<<7)
369	};
370	#endif /* _i386_ */
371
372	static const struct ds_configuration ds_cfg_core2 = {
373	.sizeof_ds = 9 * 8,
374	.bts_buffer_base = { 0, 8 },
375	.bts_index = { 8, 8 },
376	.bts_absolute_maximum = { 16, 8 },
377	.bts_interrupt_threshold = { 24, 8 },
378	.sizeof_bts = 3 * 8,
379	.from_ip = { 0, 8 },
380	.to_ip = { 8, 8 },
381	.info_type = { 8, 1 },
382	.info_data = { 9, 7 },
383	.debugctl_mask = (1<<6)\|(1<<7)\|(1<<9)
384	};
385
386	static inline void
387	ds_configure(const struct ds_configuration *cfg)
388	{
389	ds_cfg = *cfg;
390	}
391
392	void __cpuinit ds_init_intel(struct cpuinfo_x86 *c)
393	{
394	switch (c->x86) {
395	case 0x6:
396	switch (c->x86_model) {
397	#ifdef __i386__
398	case 0xD:
399	case 0xE: /* Pentium M */
400	ds_configure(&ds_cfg_pentium_m);
401	break;
402	#endif /* _i386_ */
403	case 0xF: /* Core2 */
404	ds_configure(&ds_cfg_core2);
405	break;
406	default:
407	/* sorry, don't know about them */
408	break;
409	}
410	break;
411	case 0xF:
412	switch (c->x86_model) {
413	#ifdef __i386__
414	case 0x0:
415	case 0x1:
416	case 0x2: /* Netburst */
417	ds_configure(&ds_cfg_netburst);
418	break;
419	#endif /* _i386_ */
420	default:
421	/* sorry, don't know about them */
422	break;
423	}
424	break;
425	default:
426	/* sorry, don't know about them */
427	break;
428	}
429	}