summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/platforms/cell/pmu.c
blob: 66ca4b5a1dbc6cab284962aec94ac9a38f2da189 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
/*
 * Cell Broadband Engine Performance Monitor
 *
 * (C) Copyright IBM Corporation 2001,2006
 *
 * Author:
 *    David Erb (djerb@us.ibm.com)
 *    Kevin Corry (kevcorry@us.ibm.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/interrupt.h>
#include <linux/types.h>
#include <asm/io.h>
#include <asm/irq_regs.h>
#include <asm/machdep.h>
#include <asm/pmc.h>
#include <asm/reg.h>
#include <asm/spu.h>

#include "cbe_regs.h"
#include "interrupt.h"

/*
 * When writing to write-only mmio addresses, save a shadow copy. All of the
 * registers are 32-bit, but stored in the upper-half of a 64-bit field in
 * pmd_regs.
 */

#define WRITE_WO_MMIO(reg, x)					\
	do {							\
		u32 _x = (x);					\
		struct cbe_pmd_regs __iomem *pmd_regs;		\
		struct cbe_pmd_shadow_regs *shadow_regs;	\
		pmd_regs = cbe_get_cpu_pmd_regs(cpu);		\
		shadow_regs = cbe_get_cpu_pmd_shadow_regs(cpu);	\
		out_be64(&(pmd_regs->reg), (((u64)_x) << 32));	\
		shadow_regs->reg = _x;				\
	} while (0)

#define READ_SHADOW_REG(val, reg)				\
	do {							\
		struct cbe_pmd_shadow_regs *shadow_regs;	\
		shadow_regs = cbe_get_cpu_pmd_shadow_regs(cpu);	\
		(val) = shadow_regs->reg;			\
	} while (0)

#define READ_MMIO_UPPER32(val, reg)				\
	do {							\
		struct cbe_pmd_regs __iomem *pmd_regs;		\
		pmd_regs = cbe_get_cpu_pmd_regs(cpu);		\
		(val) = (u32)(in_be64(&pmd_regs->reg) >> 32);	\
	} while (0)

/*
 * Physical counter registers.
 * Each physical counter can act as one 32-bit counter or two 16-bit counters.
 */

u32 cbe_read_phys_ctr(u32 cpu, u32 phys_ctr)
{
	u32 val_in_latch, val = 0;

	if (phys_ctr < NR_PHYS_CTRS) {
		READ_SHADOW_REG(val_in_latch, counter_value_in_latch);

		/* Read the latch or the actual counter, whichever is newer. */
		if (val_in_latch & (1 << phys_ctr)) {
			READ_SHADOW_REG(val, pm_ctr[phys_ctr]);
		} else {
			READ_MMIO_UPPER32(val, pm_ctr[phys_ctr]);
		}
	}

	return val;
}
EXPORT_SYMBOL_GPL(cbe_read_phys_ctr);

void cbe_write_phys_ctr(u32 cpu, u32 phys_ctr, u32 val)
{
	struct cbe_pmd_shadow_regs *shadow_regs;
	u32 pm_ctrl;

	if (phys_ctr < NR_PHYS_CTRS) {
		/* Writing to a counter only writes to a hardware latch.
		 * The new value is not propagated to the actual counter
		 * until the performance monitor is enabled.
		 */
		WRITE_WO_MMIO(pm_ctr[phys_ctr], val);

		pm_ctrl = cbe_read_pm(cpu, pm_control);
		if (pm_ctrl & CBE_PM_ENABLE_PERF_MON) {
			/* The counters are already active, so we need to
			 * rewrite the pm_control register to "re-enable"
			 * the PMU.
			 */
			cbe_write_pm(cpu, pm_control, pm_ctrl);
		} else {
			shadow_regs = cbe_get_cpu_pmd_shadow_regs(cpu);
			shadow_regs->counter_value_in_latch |= (1 << phys_ctr);
		}
	}
}
EXPORT_SYMBOL_GPL(cbe_write_phys_ctr);

/*
 * "Logical" counter registers.
 * These will read/write 16-bits or 32-bits depending on the
 * current size of the counter. Counters 4 - 7 are always 16-bit.
 */

u32 cbe_read_ctr(u32 cpu, u32 ctr)
{
	u32 val;
	u32 phys_ctr = ctr & (NR_PHYS_CTRS - 1);

	val = cbe_read_phys_ctr(cpu, phys_ctr);

	if (cbe_get_ctr_size(cpu, phys_ctr) == 16)
		val = (ctr < NR_PHYS_CTRS) ? (val >> 16) : (val & 0xffff);

	return val;
}
EXPORT_SYMBOL_GPL(cbe_read_ctr);

void cbe_write_ctr(u32 cpu, u32 ctr, u32 val)
{
	u32 phys_ctr;
	u32 phys_val;

	phys_ctr = ctr & (NR_PHYS_CTRS - 1);

	if (cbe_get_ctr_size(cpu, phys_ctr) == 16) {
		phys_val = cbe_read_phys_ctr(cpu, phys_ctr);

		if (ctr < NR_PHYS_CTRS)
			val = (val << 16) | (phys_val & 0xffff);
		else
			val = (val & 0xffff) | (phys_val & 0xffff0000);
	}

	cbe_write_phys_ctr(cpu, phys_ctr, val);
}
EXPORT_SYMBOL_GPL(cbe_write_ctr);

/*
 * Counter-control registers.
 * Each "logical" counter has a corresponding control register.
 */

u32 cbe_read_pm07_control(u32 cpu, u32 ctr)
{
	u32 pm07_control = 0;

	if (ctr < NR_CTRS)
		READ_SHADOW_REG(pm07_control, pm07_control[ctr]);

	return pm07_control;
}
EXPORT_SYMBOL_GPL(cbe_read_pm07_control);

void cbe_write_pm07_control(u32 cpu, u32 ctr, u32 val)
{
	if (ctr < NR_CTRS)
		WRITE_WO_MMIO(pm07_control[ctr], val);
}
EXPORT_SYMBOL_GPL(cbe_write_pm07_control);

/*
 * Other PMU control registers. Most of these are write-only.
 */

u32 cbe_read_pm(u32 cpu, enum pm_reg_name reg)
{
	u32 val = 0;

	switch (reg) {
	case group_control:
		READ_SHADOW_REG(val, group_control);
		break;

	case debug_bus_control:
		READ_SHADOW_REG(val, debug_bus_control);
		break;

	case trace_address:
		READ_MMIO_UPPER32(val, trace_address);
		break;

	case ext_tr_timer:
		READ_SHADOW_REG(val, ext_tr_timer);
		break;

	case pm_status:
		READ_MMIO_UPPER32(val, pm_status);
		break;

	case pm_control:
		READ_SHADOW_REG(val, pm_control);
		break;

	case pm_interval:
		READ_SHADOW_REG(val, pm_interval);
		break;

	case pm_start_stop:
		READ_SHADOW_REG(val, pm_start_stop);
		break;
	}

	return val;
}
EXPORT_SYMBOL_GPL(cbe_read_pm);

void cbe_write_pm(u32 cpu, enum pm_reg_name reg, u32 val)
{
	switch (reg) {
	case group_control:
		WRITE_WO_MMIO(group_control, val);
		break;

	case debug_bus_control:
		WRITE_WO_MMIO(debug_bus_control, val);
		break;

	case trace_address:
		WRITE_WO_MMIO(trace_address, val);
		break;

	case ext_tr_timer:
		WRITE_WO_MMIO(ext_tr_timer, val);
		break;

	case pm_status:
		WRITE_WO_MMIO(pm_status, val);
		break;

	case pm_control:
		WRITE_WO_MMIO(pm_control, val);
		break;

	case pm_interval:
		WRITE_WO_MMIO(pm_interval, val);
		break;

	case pm_start_stop:
		WRITE_WO_MMIO(pm_start_stop, val);
		break;
	}
}
EXPORT_SYMBOL_GPL(cbe_write_pm);

/*
 * Get/set the size of a physical counter to either 16 or 32 bits.
 */

u32 cbe_get_ctr_size(u32 cpu, u32 phys_ctr)
{
	u32 pm_ctrl, size = 0;

	if (phys_ctr < NR_PHYS_CTRS) {
		pm_ctrl = cbe_read_pm(cpu, pm_control);
		size = (pm_ctrl & CBE_PM_16BIT_CTR(phys_ctr)) ? 16 : 32;
	}

	return size;
}
EXPORT_SYMBOL_GPL(cbe_get_ctr_size);

void cbe_set_ctr_size(u32 cpu, u32 phys_ctr, u32 ctr_size)
{
	u32 pm_ctrl;

	if (phys_ctr < NR_PHYS_CTRS) {
		pm_ctrl = cbe_read_pm(cpu, pm_control);
		switch (ctr_size) {
		case 16:
			pm_ctrl |= CBE_PM_16BIT_CTR(phys_ctr);
			break;

		case 32:
			pm_ctrl &= ~CBE_PM_16BIT_CTR(phys_ctr);
			break;
		}
		cbe_write_pm(cpu, pm_control, pm_ctrl);
	}
}
EXPORT_SYMBOL_GPL(cbe_set_ctr_size);

/*
 * Enable/disable the entire performance monitoring unit.
 * When we enable the PMU, all pending writes to counters get committed.
 */

void cbe_enable_pm(u32 cpu)
{
	struct cbe_pmd_shadow_regs *shadow_regs;
	u32 pm_ctrl;

	shadow_regs = cbe_get_cpu_pmd_shadow_regs(cpu);
	shadow_regs->counter_value_in_latch = 0;

	pm_ctrl = cbe_read_pm(cpu, pm_control) | CBE_PM_ENABLE_PERF_MON;
	cbe_write_pm(cpu, pm_control, pm_ctrl);
}
EXPORT_SYMBOL_GPL(cbe_enable_pm);

void cbe_disable_pm(u32 cpu)
{
	u32 pm_ctrl;
	pm_ctrl = cbe_read_pm(cpu, pm_control) & ~CBE_PM_ENABLE_PERF_MON;
	cbe_write_pm(cpu, pm_control, pm_ctrl);
}
EXPORT_SYMBOL_GPL(cbe_disable_pm);

/*
 * Reading from the trace_buffer.
 * The trace buffer is two 64-bit registers. Reading from
 * the second half automatically increments the trace_address.
 */

void cbe_read_trace_buffer(u32 cpu, u64 *buf)
{
	struct cbe_pmd_regs __iomem *pmd_regs = cbe_get_cpu_pmd_regs(cpu);

	*buf++ = in_be64(&pmd_regs->trace_buffer_0_63);
	*buf++ = in_be64(&pmd_regs->trace_buffer_64_127);
}
EXPORT_SYMBOL_GPL(cbe_read_trace_buffer);

/*
 * Enabling/disabling interrupts for the entire performance monitoring unit.
 */

u32 cbe_get_and_clear_pm_interrupts(u32 cpu)
{
	/* Reading pm_status clears the interrupt bits. */
	return cbe_read_pm(cpu, pm_status);
}
EXPORT_SYMBOL_GPL(cbe_get_and_clear_pm_interrupts);

void cbe_enable_pm_interrupts(u32 cpu, u32 thread, u32 mask)
{
	/* Set which node and thread will handle the next interrupt. */
	iic_set_interrupt_routing(cpu, thread, 0);

	/* Enable the interrupt bits in the pm_status register. */
	if (mask)
		cbe_write_pm(cpu, pm_status, mask);
}
EXPORT_SYMBOL_GPL(cbe_enable_pm_interrupts);

void cbe_disable_pm_interrupts(u32 cpu)
{
	cbe_get_and_clear_pm_interrupts(cpu);
	cbe_write_pm(cpu, pm_status, 0);
}
EXPORT_SYMBOL_GPL(cbe_disable_pm_interrupts);

static irqreturn_t cbe_pm_irq(int irq, void *dev_id)
{
	perf_irq(get_irq_regs());
	return IRQ_HANDLED;
}

static int __init cbe_init_pm_irq(void)
{
	unsigned int irq;
	int rc, node;

	if (!machine_is(cell))
		return 0;

	for_each_node(node) {
		irq = irq_create_mapping(NULL, IIC_IRQ_IOEX_PMI |
					       (node << IIC_IRQ_NODE_SHIFT));
		if (irq == NO_IRQ) {
			printk("ERROR: Unable to allocate irq for node %d\n",
			       node);
			return -EINVAL;
		}

		rc = request_irq(irq, cbe_pm_irq,
				 IRQF_DISABLED, "cbe-pmu-0", NULL);
		if (rc) {
			printk("ERROR: Request for irq on node %d failed\n",
			       node);
			return rc;
		}
	}

	return 0;
}
arch_initcall(cbe_init_pm_irq);

void cbe_sync_irq(int node)
{
	unsigned int irq;

	irq = irq_find_mapping(NULL,
			       IIC_IRQ_IOEX_PMI
			       | (node << IIC_IRQ_NODE_SHIFT));

	if (irq == NO_IRQ) {
		printk(KERN_WARNING "ERROR, unable to get existing irq %d " \
		"for node %d\n", irq, node);
		return;
	}

	synchronize_irq(irq);
}
EXPORT_SYMBOL_GPL(cbe_sync_irq);