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18f2190d MJ |
1 | /* |
2 | * Cell Broadband Engine OProfile Support | |
3 | * | |
4 | * (C) Copyright IBM Corporation 2006 | |
5 | * | |
6 | * Author: David Erb (djerb@us.ibm.com) | |
7 | * Modifications: | |
1474855d BN |
8 | * Carl Love <carll@us.ibm.com> |
9 | * Maynard Johnson <maynardj@us.ibm.com> | |
18f2190d MJ |
10 | * |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License | |
13 | * as published by the Free Software Foundation; either version | |
14 | * 2 of the License, or (at your option) any later version. | |
15 | */ | |
16 | ||
17 | #include <linux/cpufreq.h> | |
18 | #include <linux/delay.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/jiffies.h> | |
21 | #include <linux/kthread.h> | |
22 | #include <linux/oprofile.h> | |
23 | #include <linux/percpu.h> | |
24 | #include <linux/smp.h> | |
25 | #include <linux/spinlock.h> | |
26 | #include <linux/timer.h> | |
27 | #include <asm/cell-pmu.h> | |
28 | #include <asm/cputable.h> | |
29 | #include <asm/firmware.h> | |
30 | #include <asm/io.h> | |
31 | #include <asm/oprofile_impl.h> | |
32 | #include <asm/processor.h> | |
33 | #include <asm/prom.h> | |
34 | #include <asm/ptrace.h> | |
35 | #include <asm/reg.h> | |
36 | #include <asm/rtas.h> | |
37 | #include <asm/system.h> | |
eef686a0 | 38 | #include <asm/cell-regs.h> |
18f2190d MJ |
39 | |
40 | #include "../platforms/cell/interrupt.h" | |
1474855d BN |
41 | #include "cell/pr_util.h" |
42 | ||
43 | static void cell_global_stop_spu(void); | |
44 | ||
45 | /* | |
46 | * spu_cycle_reset is the number of cycles between samples. | |
47 | * This variable is used for SPU profiling and should ONLY be set | |
48 | * at the beginning of cell_reg_setup; otherwise, it's read-only. | |
49 | */ | |
50 | static unsigned int spu_cycle_reset; | |
51 | ||
52 | #define NUM_SPUS_PER_NODE 8 | |
53 | #define SPU_CYCLES_EVENT_NUM 2 /* event number for SPU_CYCLES */ | |
18f2190d MJ |
54 | |
55 | #define PPU_CYCLES_EVENT_NUM 1 /* event number for CYCLES */ | |
1474855d BN |
56 | #define PPU_CYCLES_GRP_NUM 1 /* special group number for identifying |
57 | * PPU_CYCLES event | |
58 | */ | |
59 | #define CBE_COUNT_ALL_CYCLES 0x42800000 /* PPU cycle event specifier */ | |
18f2190d | 60 | |
bcb63e25 CL |
61 | #define NUM_THREADS 2 /* number of physical threads in |
62 | * physical processor | |
63 | */ | |
a1ef4849 | 64 | #define NUM_DEBUG_BUS_WORDS 4 |
bcb63e25 CL |
65 | #define NUM_INPUT_BUS_WORDS 2 |
66 | ||
1474855d | 67 | #define MAX_SPU_COUNT 0xFFFFFF /* maximum 24 bit LFSR value */ |
18f2190d MJ |
68 | |
69 | struct pmc_cntrl_data { | |
70 | unsigned long vcntr; | |
71 | unsigned long evnts; | |
72 | unsigned long masks; | |
73 | unsigned long enabled; | |
74 | }; | |
75 | ||
76 | /* | |
77 | * ibm,cbe-perftools rtas parameters | |
78 | */ | |
18f2190d MJ |
79 | struct pm_signal { |
80 | u16 cpu; /* Processor to modify */ | |
1474855d BN |
81 | u16 sub_unit; /* hw subunit this applies to (if applicable)*/ |
82 | short int signal_group; /* Signal Group to Enable/Disable */ | |
18f2190d MJ |
83 | u8 bus_word; /* Enable/Disable on this Trace/Trigger/Event |
84 | * Bus Word(s) (bitmask) | |
85 | */ | |
86 | u8 bit; /* Trigger/Event bit (if applicable) */ | |
87 | }; | |
88 | ||
89 | /* | |
90 | * rtas call arguments | |
91 | */ | |
92 | enum { | |
93 | SUBFUNC_RESET = 1, | |
94 | SUBFUNC_ACTIVATE = 2, | |
95 | SUBFUNC_DEACTIVATE = 3, | |
96 | ||
97 | PASSTHRU_IGNORE = 0, | |
98 | PASSTHRU_ENABLE = 1, | |
99 | PASSTHRU_DISABLE = 2, | |
100 | }; | |
101 | ||
102 | struct pm_cntrl { | |
103 | u16 enable; | |
104 | u16 stop_at_max; | |
105 | u16 trace_mode; | |
106 | u16 freeze; | |
107 | u16 count_mode; | |
108 | }; | |
109 | ||
110 | static struct { | |
111 | u32 group_control; | |
112 | u32 debug_bus_control; | |
113 | struct pm_cntrl pm_cntrl; | |
114 | u32 pm07_cntrl[NR_PHYS_CTRS]; | |
115 | } pm_regs; | |
116 | ||
18f2190d MJ |
117 | #define GET_SUB_UNIT(x) ((x & 0x0000f000) >> 12) |
118 | #define GET_BUS_WORD(x) ((x & 0x000000f0) >> 4) | |
119 | #define GET_BUS_TYPE(x) ((x & 0x00000300) >> 8) | |
120 | #define GET_POLARITY(x) ((x & 0x00000002) >> 1) | |
121 | #define GET_COUNT_CYCLES(x) (x & 0x00000001) | |
122 | #define GET_INPUT_CONTROL(x) ((x & 0x00000004) >> 2) | |
123 | ||
18f2190d MJ |
124 | static DEFINE_PER_CPU(unsigned long[NR_PHYS_CTRS], pmc_values); |
125 | ||
126 | static struct pmc_cntrl_data pmc_cntrl[NUM_THREADS][NR_PHYS_CTRS]; | |
127 | ||
1474855d BN |
128 | /* |
129 | * The CELL profiling code makes rtas calls to setup the debug bus to | |
130 | * route the performance signals. Additionally, SPU profiling requires | |
131 | * a second rtas call to setup the hardware to capture the SPU PCs. | |
132 | * The EIO error value is returned if the token lookups or the rtas | |
133 | * call fail. The EIO error number is the best choice of the existing | |
134 | * error numbers. The probability of rtas related error is very low. But | |
135 | * by returning EIO and printing additional information to dmsg the user | |
136 | * will know that OProfile did not start and dmesg will tell them why. | |
137 | * OProfile does not support returning errors on Stop. Not a huge issue | |
138 | * since failure to reset the debug bus or stop the SPU PC collection is | |
139 | * not a fatel issue. Chances are if the Stop failed, Start doesn't work | |
140 | * either. | |
141 | */ | |
142 | ||
143 | /* | |
144 | * Interpetation of hdw_thread: | |
18f2190d MJ |
145 | * 0 - even virtual cpus 0, 2, 4,... |
146 | * 1 - odd virtual cpus 1, 3, 5, ... | |
1474855d BN |
147 | * |
148 | * FIXME: this is strictly wrong, we need to clean this up in a number | |
149 | * of places. It works for now. -arnd | |
18f2190d MJ |
150 | */ |
151 | static u32 hdw_thread; | |
152 | ||
153 | static u32 virt_cntr_inter_mask; | |
154 | static struct timer_list timer_virt_cntr; | |
155 | ||
1474855d BN |
156 | /* |
157 | * pm_signal needs to be global since it is initialized in | |
18f2190d MJ |
158 | * cell_reg_setup at the time when the necessary information |
159 | * is available. | |
160 | */ | |
161 | static struct pm_signal pm_signal[NR_PHYS_CTRS]; | |
1474855d BN |
162 | static int pm_rtas_token; /* token for debug bus setup call */ |
163 | static int spu_rtas_token; /* token for SPU cycle profiling */ | |
18f2190d MJ |
164 | |
165 | static u32 reset_value[NR_PHYS_CTRS]; | |
166 | static int num_counters; | |
167 | static int oprofile_running; | |
057b184a | 168 | static DEFINE_SPINLOCK(virt_cntr_lock); |
18f2190d MJ |
169 | |
170 | static u32 ctr_enabled; | |
171 | ||
bcb63e25 | 172 | static unsigned char input_bus[NUM_INPUT_BUS_WORDS]; |
18f2190d MJ |
173 | |
174 | /* | |
175 | * Firmware interface functions | |
176 | */ | |
177 | static int | |
178 | rtas_ibm_cbe_perftools(int subfunc, int passthru, | |
179 | void *address, unsigned long length) | |
180 | { | |
181 | u64 paddr = __pa(address); | |
182 | ||
1474855d BN |
183 | return rtas_call(pm_rtas_token, 5, 1, NULL, subfunc, |
184 | passthru, paddr >> 32, paddr & 0xffffffff, length); | |
18f2190d MJ |
185 | } |
186 | ||
187 | static void pm_rtas_reset_signals(u32 node) | |
188 | { | |
189 | int ret; | |
190 | struct pm_signal pm_signal_local; | |
191 | ||
1474855d BN |
192 | /* |
193 | * The debug bus is being set to the passthru disable state. | |
194 | * However, the FW still expects atleast one legal signal routing | |
195 | * entry or it will return an error on the arguments. If we don't | |
196 | * supply a valid entry, we must ignore all return values. Ignoring | |
197 | * all return values means we might miss an error we should be | |
198 | * concerned about. | |
18f2190d MJ |
199 | */ |
200 | ||
201 | /* fw expects physical cpu #. */ | |
202 | pm_signal_local.cpu = node; | |
203 | pm_signal_local.signal_group = 21; | |
204 | pm_signal_local.bus_word = 1; | |
205 | pm_signal_local.sub_unit = 0; | |
206 | pm_signal_local.bit = 0; | |
207 | ||
208 | ret = rtas_ibm_cbe_perftools(SUBFUNC_RESET, PASSTHRU_DISABLE, | |
209 | &pm_signal_local, | |
210 | sizeof(struct pm_signal)); | |
211 | ||
1474855d BN |
212 | if (unlikely(ret)) |
213 | /* | |
214 | * Not a fatal error. For Oprofile stop, the oprofile | |
215 | * functions do not support returning an error for | |
216 | * failure to stop OProfile. | |
217 | */ | |
18f2190d | 218 | printk(KERN_WARNING "%s: rtas returned: %d\n", |
e48b1b45 | 219 | __func__, ret); |
18f2190d MJ |
220 | } |
221 | ||
1474855d | 222 | static int pm_rtas_activate_signals(u32 node, u32 count) |
18f2190d MJ |
223 | { |
224 | int ret; | |
c7eb7347 | 225 | int i, j; |
18f2190d MJ |
226 | struct pm_signal pm_signal_local[NR_PHYS_CTRS]; |
227 | ||
1474855d BN |
228 | /* |
229 | * There is no debug setup required for the cycles event. | |
c7eb7347 MJ |
230 | * Note that only events in the same group can be used. |
231 | * Otherwise, there will be conflicts in correctly routing | |
232 | * the signals on the debug bus. It is the responsiblity | |
233 | * of the OProfile user tool to check the events are in | |
234 | * the same group. | |
235 | */ | |
236 | i = 0; | |
18f2190d | 237 | for (j = 0; j < count; j++) { |
c7eb7347 MJ |
238 | if (pm_signal[j].signal_group != PPU_CYCLES_GRP_NUM) { |
239 | ||
240 | /* fw expects physical cpu # */ | |
241 | pm_signal_local[i].cpu = node; | |
242 | pm_signal_local[i].signal_group | |
243 | = pm_signal[j].signal_group; | |
244 | pm_signal_local[i].bus_word = pm_signal[j].bus_word; | |
245 | pm_signal_local[i].sub_unit = pm_signal[j].sub_unit; | |
246 | pm_signal_local[i].bit = pm_signal[j].bit; | |
247 | i++; | |
248 | } | |
18f2190d MJ |
249 | } |
250 | ||
c7eb7347 MJ |
251 | if (i != 0) { |
252 | ret = rtas_ibm_cbe_perftools(SUBFUNC_ACTIVATE, PASSTHRU_ENABLE, | |
253 | pm_signal_local, | |
254 | i * sizeof(struct pm_signal)); | |
18f2190d | 255 | |
1474855d | 256 | if (unlikely(ret)) { |
c7eb7347 | 257 | printk(KERN_WARNING "%s: rtas returned: %d\n", |
e48b1b45 | 258 | __func__, ret); |
1474855d BN |
259 | return -EIO; |
260 | } | |
c7eb7347 | 261 | } |
1474855d BN |
262 | |
263 | return 0; | |
18f2190d MJ |
264 | } |
265 | ||
266 | /* | |
267 | * PM Signal functions | |
268 | */ | |
269 | static void set_pm_event(u32 ctr, int event, u32 unit_mask) | |
270 | { | |
271 | struct pm_signal *p; | |
272 | u32 signal_bit; | |
273 | u32 bus_word, bus_type, count_cycles, polarity, input_control; | |
274 | int j, i; | |
275 | ||
276 | if (event == PPU_CYCLES_EVENT_NUM) { | |
277 | /* Special Event: Count all cpu cycles */ | |
278 | pm_regs.pm07_cntrl[ctr] = CBE_COUNT_ALL_CYCLES; | |
279 | p = &(pm_signal[ctr]); | |
c7eb7347 | 280 | p->signal_group = PPU_CYCLES_GRP_NUM; |
18f2190d MJ |
281 | p->bus_word = 1; |
282 | p->sub_unit = 0; | |
283 | p->bit = 0; | |
284 | goto out; | |
285 | } else { | |
286 | pm_regs.pm07_cntrl[ctr] = 0; | |
287 | } | |
288 | ||
289 | bus_word = GET_BUS_WORD(unit_mask); | |
290 | bus_type = GET_BUS_TYPE(unit_mask); | |
291 | count_cycles = GET_COUNT_CYCLES(unit_mask); | |
292 | polarity = GET_POLARITY(unit_mask); | |
293 | input_control = GET_INPUT_CONTROL(unit_mask); | |
294 | signal_bit = (event % 100); | |
295 | ||
296 | p = &(pm_signal[ctr]); | |
297 | ||
298 | p->signal_group = event / 100; | |
299 | p->bus_word = bus_word; | |
a1ef4849 | 300 | p->sub_unit = GET_SUB_UNIT(unit_mask); |
18f2190d MJ |
301 | |
302 | pm_regs.pm07_cntrl[ctr] = 0; | |
303 | pm_regs.pm07_cntrl[ctr] |= PM07_CTR_COUNT_CYCLES(count_cycles); | |
304 | pm_regs.pm07_cntrl[ctr] |= PM07_CTR_POLARITY(polarity); | |
305 | pm_regs.pm07_cntrl[ctr] |= PM07_CTR_INPUT_CONTROL(input_control); | |
306 | ||
1474855d BN |
307 | /* |
308 | * Some of the islands signal selection is based on 64 bit words. | |
bcb63e25 CL |
309 | * The debug bus words are 32 bits, the input words to the performance |
310 | * counters are defined as 32 bits. Need to convert the 64 bit island | |
311 | * specification to the appropriate 32 input bit and bus word for the | |
1474855d | 312 | * performance counter event selection. See the CELL Performance |
bcb63e25 CL |
313 | * monitoring signals manual and the Perf cntr hardware descriptions |
314 | * for the details. | |
315 | */ | |
18f2190d MJ |
316 | if (input_control == 0) { |
317 | if (signal_bit > 31) { | |
318 | signal_bit -= 32; | |
319 | if (bus_word == 0x3) | |
320 | bus_word = 0x2; | |
321 | else if (bus_word == 0xc) | |
322 | bus_word = 0x8; | |
323 | } | |
324 | ||
325 | if ((bus_type == 0) && p->signal_group >= 60) | |
326 | bus_type = 2; | |
327 | if ((bus_type == 1) && p->signal_group >= 50) | |
328 | bus_type = 0; | |
329 | ||
330 | pm_regs.pm07_cntrl[ctr] |= PM07_CTR_INPUT_MUX(signal_bit); | |
331 | } else { | |
332 | pm_regs.pm07_cntrl[ctr] = 0; | |
333 | p->bit = signal_bit; | |
334 | } | |
335 | ||
a1ef4849 | 336 | for (i = 0; i < NUM_DEBUG_BUS_WORDS; i++) { |
18f2190d MJ |
337 | if (bus_word & (1 << i)) { |
338 | pm_regs.debug_bus_control |= | |
a1ef4849 | 339 | (bus_type << (30 - (2 * i))); |
18f2190d | 340 | |
bcb63e25 | 341 | for (j = 0; j < NUM_INPUT_BUS_WORDS; j++) { |
18f2190d MJ |
342 | if (input_bus[j] == 0xff) { |
343 | input_bus[j] = i; | |
344 | pm_regs.group_control |= | |
a1ef4849 | 345 | (i << (30 - (2 * j))); |
1474855d | 346 | |
18f2190d MJ |
347 | break; |
348 | } | |
349 | } | |
350 | } | |
351 | } | |
352 | out: | |
353 | ; | |
354 | } | |
355 | ||
bcb63e25 | 356 | static void write_pm_cntrl(int cpu) |
18f2190d | 357 | { |
1474855d BN |
358 | /* |
359 | * Oprofile will use 32 bit counters, set bits 7:10 to 0 | |
bcb63e25 CL |
360 | * pmregs.pm_cntrl is a global |
361 | */ | |
362 | ||
18f2190d | 363 | u32 val = 0; |
bcb63e25 | 364 | if (pm_regs.pm_cntrl.enable == 1) |
18f2190d MJ |
365 | val |= CBE_PM_ENABLE_PERF_MON; |
366 | ||
bcb63e25 | 367 | if (pm_regs.pm_cntrl.stop_at_max == 1) |
18f2190d MJ |
368 | val |= CBE_PM_STOP_AT_MAX; |
369 | ||
bcb63e25 CL |
370 | if (pm_regs.pm_cntrl.trace_mode == 1) |
371 | val |= CBE_PM_TRACE_MODE_SET(pm_regs.pm_cntrl.trace_mode); | |
18f2190d | 372 | |
bcb63e25 | 373 | if (pm_regs.pm_cntrl.freeze == 1) |
18f2190d MJ |
374 | val |= CBE_PM_FREEZE_ALL_CTRS; |
375 | ||
1474855d BN |
376 | /* |
377 | * Routine set_count_mode must be called previously to set | |
18f2190d MJ |
378 | * the count mode based on the user selection of user and kernel. |
379 | */ | |
bcb63e25 | 380 | val |= CBE_PM_COUNT_MODE_SET(pm_regs.pm_cntrl.count_mode); |
18f2190d MJ |
381 | cbe_write_pm(cpu, pm_control, val); |
382 | } | |
383 | ||
384 | static inline void | |
bcb63e25 | 385 | set_count_mode(u32 kernel, u32 user) |
18f2190d | 386 | { |
1474855d BN |
387 | /* |
388 | * The user must specify user and kernel if they want them. If | |
bcb63e25 CL |
389 | * neither is specified, OProfile will count in hypervisor mode. |
390 | * pm_regs.pm_cntrl is a global | |
18f2190d MJ |
391 | */ |
392 | if (kernel) { | |
393 | if (user) | |
bcb63e25 | 394 | pm_regs.pm_cntrl.count_mode = CBE_COUNT_ALL_MODES; |
18f2190d | 395 | else |
bcb63e25 CL |
396 | pm_regs.pm_cntrl.count_mode = |
397 | CBE_COUNT_SUPERVISOR_MODE; | |
18f2190d MJ |
398 | } else { |
399 | if (user) | |
bcb63e25 | 400 | pm_regs.pm_cntrl.count_mode = CBE_COUNT_PROBLEM_MODE; |
18f2190d | 401 | else |
bcb63e25 CL |
402 | pm_regs.pm_cntrl.count_mode = |
403 | CBE_COUNT_HYPERVISOR_MODE; | |
18f2190d MJ |
404 | } |
405 | } | |
406 | ||
25ad2913 | 407 | static inline void enable_ctr(u32 cpu, u32 ctr, u32 *pm07_cntrl) |
18f2190d MJ |
408 | { |
409 | ||
bcb63e25 | 410 | pm07_cntrl[ctr] |= CBE_PM_CTR_ENABLE; |
18f2190d MJ |
411 | cbe_write_pm07_control(cpu, ctr, pm07_cntrl[ctr]); |
412 | } | |
413 | ||
414 | /* | |
415 | * Oprofile is expected to collect data on all CPUs simultaneously. | |
1474855d | 416 | * However, there is one set of performance counters per node. There are |
18f2190d MJ |
417 | * two hardware threads or virtual CPUs on each node. Hence, OProfile must |
418 | * multiplex in time the performance counter collection on the two virtual | |
419 | * CPUs. The multiplexing of the performance counters is done by this | |
420 | * virtual counter routine. | |
421 | * | |
422 | * The pmc_values used below is defined as 'per-cpu' but its use is | |
423 | * more akin to 'per-node'. We need to store two sets of counter | |
424 | * values per node -- one for the previous run and one for the next. | |
425 | * The per-cpu[NR_PHYS_CTRS] gives us the storage we need. Each odd/even | |
426 | * pair of per-cpu arrays is used for storing the previous and next | |
427 | * pmc values for a given node. | |
428 | * NOTE: We use the per-cpu variable to improve cache performance. | |
1474855d BN |
429 | * |
430 | * This routine will alternate loading the virtual counters for | |
431 | * virtual CPUs | |
18f2190d MJ |
432 | */ |
433 | static void cell_virtual_cntr(unsigned long data) | |
434 | { | |
18f2190d MJ |
435 | int i, prev_hdw_thread, next_hdw_thread; |
436 | u32 cpu; | |
437 | unsigned long flags; | |
438 | ||
1474855d BN |
439 | /* |
440 | * Make sure that the interrupt_hander and the virt counter are | |
441 | * not both playing with the counters on the same node. | |
18f2190d MJ |
442 | */ |
443 | ||
444 | spin_lock_irqsave(&virt_cntr_lock, flags); | |
445 | ||
446 | prev_hdw_thread = hdw_thread; | |
447 | ||
448 | /* switch the cpu handling the interrupts */ | |
449 | hdw_thread = 1 ^ hdw_thread; | |
450 | next_hdw_thread = hdw_thread; | |
451 | ||
a1ef4849 BN |
452 | pm_regs.group_control = 0; |
453 | pm_regs.debug_bus_control = 0; | |
454 | ||
455 | for (i = 0; i < NUM_INPUT_BUS_WORDS; i++) | |
456 | input_bus[i] = 0xff; | |
457 | ||
1474855d BN |
458 | /* |
459 | * There are some per thread events. Must do the | |
bcb63e25 CL |
460 | * set event, for the thread that is being started |
461 | */ | |
1474855d | 462 | for (i = 0; i < num_counters; i++) |
bcb63e25 CL |
463 | set_pm_event(i, |
464 | pmc_cntrl[next_hdw_thread][i].evnts, | |
465 | pmc_cntrl[next_hdw_thread][i].masks); | |
466 | ||
1474855d BN |
467 | /* |
468 | * The following is done only once per each node, but | |
18f2190d MJ |
469 | * we need cpu #, not node #, to pass to the cbe_xxx functions. |
470 | */ | |
471 | for_each_online_cpu(cpu) { | |
472 | if (cbe_get_hw_thread_id(cpu)) | |
473 | continue; | |
474 | ||
1474855d BN |
475 | /* |
476 | * stop counters, save counter values, restore counts | |
18f2190d MJ |
477 | * for previous thread |
478 | */ | |
479 | cbe_disable_pm(cpu); | |
480 | cbe_disable_pm_interrupts(cpu); | |
481 | for (i = 0; i < num_counters; i++) { | |
482 | per_cpu(pmc_values, cpu + prev_hdw_thread)[i] | |
483 | = cbe_read_ctr(cpu, i); | |
484 | ||
485 | if (per_cpu(pmc_values, cpu + next_hdw_thread)[i] | |
486 | == 0xFFFFFFFF) | |
487 | /* If the cntr value is 0xffffffff, we must | |
488 | * reset that to 0xfffffff0 when the current | |
1474855d | 489 | * thread is restarted. This will generate a |
bcb63e25 CL |
490 | * new interrupt and make sure that we never |
491 | * restore the counters to the max value. If | |
492 | * the counters were restored to the max value, | |
493 | * they do not increment and no interrupts are | |
494 | * generated. Hence no more samples will be | |
495 | * collected on that cpu. | |
18f2190d MJ |
496 | */ |
497 | cbe_write_ctr(cpu, i, 0xFFFFFFF0); | |
498 | else | |
499 | cbe_write_ctr(cpu, i, | |
500 | per_cpu(pmc_values, | |
501 | cpu + | |
502 | next_hdw_thread)[i]); | |
503 | } | |
504 | ||
1474855d BN |
505 | /* |
506 | * Switch to the other thread. Change the interrupt | |
18f2190d MJ |
507 | * and control regs to be scheduled on the CPU |
508 | * corresponding to the thread to execute. | |
509 | */ | |
510 | for (i = 0; i < num_counters; i++) { | |
511 | if (pmc_cntrl[next_hdw_thread][i].enabled) { | |
1474855d BN |
512 | /* |
513 | * There are some per thread events. | |
18f2190d MJ |
514 | * Must do the set event, enable_cntr |
515 | * for each cpu. | |
516 | */ | |
18f2190d MJ |
517 | enable_ctr(cpu, i, |
518 | pm_regs.pm07_cntrl); | |
519 | } else { | |
520 | cbe_write_pm07_control(cpu, i, 0); | |
521 | } | |
522 | } | |
523 | ||
524 | /* Enable interrupts on the CPU thread that is starting */ | |
525 | cbe_enable_pm_interrupts(cpu, next_hdw_thread, | |
526 | virt_cntr_inter_mask); | |
527 | cbe_enable_pm(cpu); | |
528 | } | |
529 | ||
530 | spin_unlock_irqrestore(&virt_cntr_lock, flags); | |
531 | ||
532 | mod_timer(&timer_virt_cntr, jiffies + HZ / 10); | |
533 | } | |
534 | ||
535 | static void start_virt_cntrs(void) | |
536 | { | |
537 | init_timer(&timer_virt_cntr); | |
538 | timer_virt_cntr.function = cell_virtual_cntr; | |
539 | timer_virt_cntr.data = 0UL; | |
540 | timer_virt_cntr.expires = jiffies + HZ / 10; | |
541 | add_timer(&timer_virt_cntr); | |
542 | } | |
543 | ||
544 | /* This function is called once for all cpus combined */ | |
1474855d BN |
545 | static int cell_reg_setup(struct op_counter_config *ctr, |
546 | struct op_system_config *sys, int num_ctrs) | |
18f2190d MJ |
547 | { |
548 | int i, j, cpu; | |
1474855d BN |
549 | spu_cycle_reset = 0; |
550 | ||
551 | if (ctr[0].event == SPU_CYCLES_EVENT_NUM) { | |
552 | spu_cycle_reset = ctr[0].count; | |
553 | ||
554 | /* | |
555 | * Each node will need to make the rtas call to start | |
556 | * and stop SPU profiling. Get the token once and store it. | |
557 | */ | |
558 | spu_rtas_token = rtas_token("ibm,cbe-spu-perftools"); | |
559 | ||
560 | if (unlikely(spu_rtas_token == RTAS_UNKNOWN_SERVICE)) { | |
561 | printk(KERN_ERR | |
562 | "%s: rtas token ibm,cbe-spu-perftools unknown\n", | |
e48b1b45 | 563 | __func__); |
1474855d BN |
564 | return -EIO; |
565 | } | |
566 | } | |
18f2190d MJ |
567 | |
568 | pm_rtas_token = rtas_token("ibm,cbe-perftools"); | |
1474855d BN |
569 | |
570 | /* | |
571 | * For all events excetp PPU CYCLEs, each node will need to make | |
572 | * the rtas cbe-perftools call to setup and reset the debug bus. | |
573 | * Make the token lookup call once and store it in the global | |
574 | * variable pm_rtas_token. | |
575 | */ | |
576 | if (unlikely(pm_rtas_token == RTAS_UNKNOWN_SERVICE)) { | |
577 | printk(KERN_ERR | |
578 | "%s: rtas token ibm,cbe-perftools unknown\n", | |
e48b1b45 | 579 | __func__); |
1474855d | 580 | return -EIO; |
18f2190d MJ |
581 | } |
582 | ||
583 | num_counters = num_ctrs; | |
584 | ||
210434d7 CL |
585 | if (unlikely(num_ctrs > NR_PHYS_CTRS)) { |
586 | printk(KERN_ERR | |
587 | "%s: Oprofile, number of specified events " \ | |
588 | "exceeds number of physical counters\n", | |
589 | __func__); | |
590 | return -EIO; | |
591 | } | |
18f2190d MJ |
592 | pm_regs.group_control = 0; |
593 | pm_regs.debug_bus_control = 0; | |
594 | ||
595 | /* setup the pm_control register */ | |
596 | memset(&pm_regs.pm_cntrl, 0, sizeof(struct pm_cntrl)); | |
597 | pm_regs.pm_cntrl.stop_at_max = 1; | |
598 | pm_regs.pm_cntrl.trace_mode = 0; | |
599 | pm_regs.pm_cntrl.freeze = 1; | |
600 | ||
bcb63e25 | 601 | set_count_mode(sys->enable_kernel, sys->enable_user); |
18f2190d MJ |
602 | |
603 | /* Setup the thread 0 events */ | |
604 | for (i = 0; i < num_ctrs; ++i) { | |
605 | ||
606 | pmc_cntrl[0][i].evnts = ctr[i].event; | |
607 | pmc_cntrl[0][i].masks = ctr[i].unit_mask; | |
608 | pmc_cntrl[0][i].enabled = ctr[i].enabled; | |
609 | pmc_cntrl[0][i].vcntr = i; | |
610 | ||
611 | for_each_possible_cpu(j) | |
612 | per_cpu(pmc_values, j)[i] = 0; | |
613 | } | |
614 | ||
1474855d BN |
615 | /* |
616 | * Setup the thread 1 events, map the thread 0 event to the | |
18f2190d MJ |
617 | * equivalent thread 1 event. |
618 | */ | |
619 | for (i = 0; i < num_ctrs; ++i) { | |
620 | if ((ctr[i].event >= 2100) && (ctr[i].event <= 2111)) | |
621 | pmc_cntrl[1][i].evnts = ctr[i].event + 19; | |
622 | else if (ctr[i].event == 2203) | |
623 | pmc_cntrl[1][i].evnts = ctr[i].event; | |
624 | else if ((ctr[i].event >= 2200) && (ctr[i].event <= 2215)) | |
625 | pmc_cntrl[1][i].evnts = ctr[i].event + 16; | |
626 | else | |
627 | pmc_cntrl[1][i].evnts = ctr[i].event; | |
628 | ||
629 | pmc_cntrl[1][i].masks = ctr[i].unit_mask; | |
630 | pmc_cntrl[1][i].enabled = ctr[i].enabled; | |
631 | pmc_cntrl[1][i].vcntr = i; | |
632 | } | |
633 | ||
bcb63e25 | 634 | for (i = 0; i < NUM_INPUT_BUS_WORDS; i++) |
18f2190d MJ |
635 | input_bus[i] = 0xff; |
636 | ||
1474855d BN |
637 | /* |
638 | * Our counters count up, and "count" refers to | |
18f2190d | 639 | * how much before the next interrupt, and we interrupt |
1474855d | 640 | * on overflow. So we calculate the starting value |
18f2190d MJ |
641 | * which will give us "count" until overflow. |
642 | * Then we set the events on the enabled counters. | |
643 | */ | |
644 | for (i = 0; i < num_counters; ++i) { | |
645 | /* start with virtual counter set 0 */ | |
646 | if (pmc_cntrl[0][i].enabled) { | |
647 | /* Using 32bit counters, reset max - count */ | |
648 | reset_value[i] = 0xFFFFFFFF - ctr[i].count; | |
649 | set_pm_event(i, | |
650 | pmc_cntrl[0][i].evnts, | |
651 | pmc_cntrl[0][i].masks); | |
652 | ||
653 | /* global, used by cell_cpu_setup */ | |
654 | ctr_enabled |= (1 << i); | |
655 | } | |
656 | } | |
657 | ||
658 | /* initialize the previous counts for the virtual cntrs */ | |
659 | for_each_online_cpu(cpu) | |
660 | for (i = 0; i < num_counters; ++i) { | |
661 | per_cpu(pmc_values, cpu)[i] = reset_value[i]; | |
662 | } | |
1474855d BN |
663 | |
664 | return 0; | |
18f2190d MJ |
665 | } |
666 | ||
1474855d BN |
667 | |
668 | ||
18f2190d | 669 | /* This function is called once for each cpu */ |
1474855d | 670 | static int cell_cpu_setup(struct op_counter_config *cntr) |
18f2190d MJ |
671 | { |
672 | u32 cpu = smp_processor_id(); | |
673 | u32 num_enabled = 0; | |
674 | int i; | |
675 | ||
1474855d BN |
676 | if (spu_cycle_reset) |
677 | return 0; | |
678 | ||
18f2190d MJ |
679 | /* There is one performance monitor per processor chip (i.e. node), |
680 | * so we only need to perform this function once per node. | |
681 | */ | |
682 | if (cbe_get_hw_thread_id(cpu)) | |
1474855d | 683 | return 0; |
18f2190d MJ |
684 | |
685 | /* Stop all counters */ | |
686 | cbe_disable_pm(cpu); | |
687 | cbe_disable_pm_interrupts(cpu); | |
688 | ||
689 | cbe_write_pm(cpu, pm_interval, 0); | |
690 | cbe_write_pm(cpu, pm_start_stop, 0); | |
691 | cbe_write_pm(cpu, group_control, pm_regs.group_control); | |
692 | cbe_write_pm(cpu, debug_bus_control, pm_regs.debug_bus_control); | |
bcb63e25 | 693 | write_pm_cntrl(cpu); |
18f2190d MJ |
694 | |
695 | for (i = 0; i < num_counters; ++i) { | |
696 | if (ctr_enabled & (1 << i)) { | |
697 | pm_signal[num_enabled].cpu = cbe_cpu_to_node(cpu); | |
698 | num_enabled++; | |
699 | } | |
700 | } | |
701 | ||
1474855d BN |
702 | /* |
703 | * The pm_rtas_activate_signals will return -EIO if the FW | |
704 | * call failed. | |
705 | */ | |
706 | return pm_rtas_activate_signals(cbe_cpu_to_node(cpu), num_enabled); | |
707 | } | |
708 | ||
709 | #define ENTRIES 303 | |
710 | #define MAXLFSR 0xFFFFFF | |
711 | ||
712 | /* precomputed table of 24 bit LFSR values */ | |
713 | static int initial_lfsr[] = { | |
714 | 8221349, 12579195, 5379618, 10097839, 7512963, 7519310, 3955098, 10753424, | |
715 | 15507573, 7458917, 285419, 2641121, 9780088, 3915503, 6668768, 1548716, | |
716 | 4885000, 8774424, 9650099, 2044357, 2304411, 9326253, 10332526, 4421547, | |
717 | 3440748, 10179459, 13332843, 10375561, 1313462, 8375100, 5198480, 6071392, | |
718 | 9341783, 1526887, 3985002, 1439429, 13923762, 7010104, 11969769, 4547026, | |
719 | 2040072, 4025602, 3437678, 7939992, 11444177, 4496094, 9803157, 10745556, | |
720 | 3671780, 4257846, 5662259, 13196905, 3237343, 12077182, 16222879, 7587769, | |
721 | 14706824, 2184640, 12591135, 10420257, 7406075, 3648978, 11042541, 15906893, | |
722 | 11914928, 4732944, 10695697, 12928164, 11980531, 4430912, 11939291, 2917017, | |
723 | 6119256, 4172004, 9373765, 8410071, 14788383, 5047459, 5474428, 1737756, | |
724 | 15967514, 13351758, 6691285, 8034329, 2856544, 14394753, 11310160, 12149558, | |
725 | 7487528, 7542781, 15668898, 12525138, 12790975, 3707933, 9106617, 1965401, | |
726 | 16219109, 12801644, 2443203, 4909502, 8762329, 3120803, 6360315, 9309720, | |
727 | 15164599, 10844842, 4456529, 6667610, 14924259, 884312, 6234963, 3326042, | |
728 | 15973422, 13919464, 5272099, 6414643, 3909029, 2764324, 5237926, 4774955, | |
729 | 10445906, 4955302, 5203726, 10798229, 11443419, 2303395, 333836, 9646934, | |
730 | 3464726, 4159182, 568492, 995747, 10318756, 13299332, 4836017, 8237783, | |
731 | 3878992, 2581665, 11394667, 5672745, 14412947, 3159169, 9094251, 16467278, | |
732 | 8671392, 15230076, 4843545, 7009238, 15504095, 1494895, 9627886, 14485051, | |
733 | 8304291, 252817, 12421642, 16085736, 4774072, 2456177, 4160695, 15409741, | |
734 | 4902868, 5793091, 13162925, 16039714, 782255, 11347835, 14884586, 366972, | |
735 | 16308990, 11913488, 13390465, 2958444, 10340278, 1177858, 1319431, 10426302, | |
736 | 2868597, 126119, 5784857, 5245324, 10903900, 16436004, 3389013, 1742384, | |
737 | 14674502, 10279218, 8536112, 10364279, 6877778, 14051163, 1025130, 6072469, | |
738 | 1988305, 8354440, 8216060, 16342977, 13112639, 3976679, 5913576, 8816697, | |
739 | 6879995, 14043764, 3339515, 9364420, 15808858, 12261651, 2141560, 5636398, | |
740 | 10345425, 10414756, 781725, 6155650, 4746914, 5078683, 7469001, 6799140, | |
741 | 10156444, 9667150, 10116470, 4133858, 2121972, 1124204, 1003577, 1611214, | |
742 | 14304602, 16221850, 13878465, 13577744, 3629235, 8772583, 10881308, 2410386, | |
743 | 7300044, 5378855, 9301235, 12755149, 4977682, 8083074, 10327581, 6395087, | |
744 | 9155434, 15501696, 7514362, 14520507, 15808945, 3244584, 4741962, 9658130, | |
745 | 14336147, 8654727, 7969093, 15759799, 14029445, 5038459, 9894848, 8659300, | |
746 | 13699287, 8834306, 10712885, 14753895, 10410465, 3373251, 309501, 9561475, | |
747 | 5526688, 14647426, 14209836, 5339224, 207299, 14069911, 8722990, 2290950, | |
748 | 3258216, 12505185, 6007317, 9218111, 14661019, 10537428, 11731949, 9027003, | |
749 | 6641507, 9490160, 200241, 9720425, 16277895, 10816638, 1554761, 10431375, | |
750 | 7467528, 6790302, 3429078, 14633753, 14428997, 11463204, 3576212, 2003426, | |
751 | 6123687, 820520, 9992513, 15784513, 5778891, 6428165, 8388607 | |
752 | }; | |
753 | ||
754 | /* | |
755 | * The hardware uses an LFSR counting sequence to determine when to capture | |
756 | * the SPU PCs. An LFSR sequence is like a puesdo random number sequence | |
757 | * where each number occurs once in the sequence but the sequence is not in | |
758 | * numerical order. The SPU PC capture is done when the LFSR sequence reaches | |
759 | * the last value in the sequence. Hence the user specified value N | |
760 | * corresponds to the LFSR number that is N from the end of the sequence. | |
761 | * | |
762 | * To avoid the time to compute the LFSR, a lookup table is used. The 24 bit | |
763 | * LFSR sequence is broken into four ranges. The spacing of the precomputed | |
764 | * values is adjusted in each range so the error between the user specifed | |
765 | * number (N) of events between samples and the actual number of events based | |
766 | * on the precomputed value will be les then about 6.2%. Note, if the user | |
767 | * specifies N < 2^16, the LFSR value that is 2^16 from the end will be used. | |
768 | * This is to prevent the loss of samples because the trace buffer is full. | |
769 | * | |
770 | * User specified N Step between Index in | |
771 | * precomputed values precomputed | |
772 | * table | |
773 | * 0 to 2^16-1 ---- 0 | |
774 | * 2^16 to 2^16+2^19-1 2^12 1 to 128 | |
775 | * 2^16+2^19 to 2^16+2^19+2^22-1 2^15 129 to 256 | |
776 | * 2^16+2^19+2^22 to 2^24-1 2^18 257 to 302 | |
777 | * | |
778 | * | |
779 | * For example, the LFSR values in the second range are computed for 2^16, | |
780 | * 2^16+2^12, ... , 2^19-2^16, 2^19 and stored in the table at indicies | |
781 | * 1, 2,..., 127, 128. | |
782 | * | |
783 | * The 24 bit LFSR value for the nth number in the sequence can be | |
784 | * calculated using the following code: | |
785 | * | |
786 | * #define size 24 | |
787 | * int calculate_lfsr(int n) | |
788 | * { | |
789 | * int i; | |
790 | * unsigned int newlfsr0; | |
791 | * unsigned int lfsr = 0xFFFFFF; | |
792 | * unsigned int howmany = n; | |
793 | * | |
794 | * for (i = 2; i < howmany + 2; i++) { | |
795 | * newlfsr0 = (((lfsr >> (size - 1 - 0)) & 1) ^ | |
796 | * ((lfsr >> (size - 1 - 1)) & 1) ^ | |
797 | * (((lfsr >> (size - 1 - 6)) & 1) ^ | |
798 | * ((lfsr >> (size - 1 - 23)) & 1))); | |
799 | * | |
800 | * lfsr >>= 1; | |
801 | * lfsr = lfsr | (newlfsr0 << (size - 1)); | |
802 | * } | |
803 | * return lfsr; | |
804 | * } | |
805 | */ | |
806 | ||
807 | #define V2_16 (0x1 << 16) | |
808 | #define V2_19 (0x1 << 19) | |
809 | #define V2_22 (0x1 << 22) | |
810 | ||
811 | static int calculate_lfsr(int n) | |
812 | { | |
813 | /* | |
814 | * The ranges and steps are in powers of 2 so the calculations | |
815 | * can be done using shifts rather then divide. | |
816 | */ | |
817 | int index; | |
818 | ||
819 | if ((n >> 16) == 0) | |
820 | index = 0; | |
821 | else if (((n - V2_16) >> 19) == 0) | |
822 | index = ((n - V2_16) >> 12) + 1; | |
823 | else if (((n - V2_16 - V2_19) >> 22) == 0) | |
824 | index = ((n - V2_16 - V2_19) >> 15 ) + 1 + 128; | |
825 | else if (((n - V2_16 - V2_19 - V2_22) >> 24) == 0) | |
826 | index = ((n - V2_16 - V2_19 - V2_22) >> 18 ) + 1 + 256; | |
827 | else | |
828 | index = ENTRIES-1; | |
829 | ||
830 | /* make sure index is valid */ | |
831 | if ((index > ENTRIES) || (index < 0)) | |
832 | index = ENTRIES-1; | |
833 | ||
834 | return initial_lfsr[index]; | |
835 | } | |
836 | ||
837 | static int pm_rtas_activate_spu_profiling(u32 node) | |
838 | { | |
839 | int ret, i; | |
210434d7 | 840 | struct pm_signal pm_signal_local[NUM_SPUS_PER_NODE]; |
1474855d BN |
841 | |
842 | /* | |
843 | * Set up the rtas call to configure the debug bus to | |
844 | * route the SPU PCs. Setup the pm_signal for each SPU | |
845 | */ | |
210434d7 | 846 | for (i = 0; i < ARRAY_SIZE(pm_signal_local); i++) { |
1474855d BN |
847 | pm_signal_local[i].cpu = node; |
848 | pm_signal_local[i].signal_group = 41; | |
849 | /* spu i on word (i/2) */ | |
850 | pm_signal_local[i].bus_word = 1 << i / 2; | |
851 | /* spu i */ | |
852 | pm_signal_local[i].sub_unit = i; | |
853 | pm_signal_local[i].bit = 63; | |
854 | } | |
855 | ||
856 | ret = rtas_ibm_cbe_perftools(SUBFUNC_ACTIVATE, | |
857 | PASSTHRU_ENABLE, pm_signal_local, | |
210434d7 | 858 | (ARRAY_SIZE(pm_signal_local) |
1474855d BN |
859 | * sizeof(struct pm_signal))); |
860 | ||
861 | if (unlikely(ret)) { | |
862 | printk(KERN_WARNING "%s: rtas returned: %d\n", | |
e48b1b45 | 863 | __func__, ret); |
1474855d BN |
864 | return -EIO; |
865 | } | |
866 | ||
867 | return 0; | |
868 | } | |
869 | ||
870 | #ifdef CONFIG_CPU_FREQ | |
871 | static int | |
872 | oprof_cpufreq_notify(struct notifier_block *nb, unsigned long val, void *data) | |
873 | { | |
874 | int ret = 0; | |
875 | struct cpufreq_freqs *frq = data; | |
876 | if ((val == CPUFREQ_PRECHANGE && frq->old < frq->new) || | |
877 | (val == CPUFREQ_POSTCHANGE && frq->old > frq->new) || | |
878 | (val == CPUFREQ_RESUMECHANGE || val == CPUFREQ_SUSPENDCHANGE)) | |
879 | set_spu_profiling_frequency(frq->new, spu_cycle_reset); | |
880 | return ret; | |
881 | } | |
882 | ||
883 | static struct notifier_block cpu_freq_notifier_block = { | |
884 | .notifier_call = oprof_cpufreq_notify | |
885 | }; | |
886 | #endif | |
887 | ||
888 | static int cell_global_start_spu(struct op_counter_config *ctr) | |
889 | { | |
890 | int subfunc; | |
891 | unsigned int lfsr_value; | |
892 | int cpu; | |
893 | int ret; | |
894 | int rtas_error; | |
895 | unsigned int cpu_khzfreq = 0; | |
896 | ||
897 | /* The SPU profiling uses time-based profiling based on | |
898 | * cpu frequency, so if configured with the CPU_FREQ | |
899 | * option, we should detect frequency changes and react | |
900 | * accordingly. | |
901 | */ | |
902 | #ifdef CONFIG_CPU_FREQ | |
903 | ret = cpufreq_register_notifier(&cpu_freq_notifier_block, | |
904 | CPUFREQ_TRANSITION_NOTIFIER); | |
905 | if (ret < 0) | |
906 | /* this is not a fatal error */ | |
907 | printk(KERN_ERR "CPU freq change registration failed: %d\n", | |
908 | ret); | |
909 | ||
910 | else | |
911 | cpu_khzfreq = cpufreq_quick_get(smp_processor_id()); | |
912 | #endif | |
913 | ||
914 | set_spu_profiling_frequency(cpu_khzfreq, spu_cycle_reset); | |
915 | ||
916 | for_each_online_cpu(cpu) { | |
917 | if (cbe_get_hw_thread_id(cpu)) | |
918 | continue; | |
919 | ||
920 | /* | |
921 | * Setup SPU cycle-based profiling. | |
922 | * Set perf_mon_control bit 0 to a zero before | |
923 | * enabling spu collection hardware. | |
924 | */ | |
925 | cbe_write_pm(cpu, pm_control, 0); | |
926 | ||
927 | if (spu_cycle_reset > MAX_SPU_COUNT) | |
928 | /* use largest possible value */ | |
929 | lfsr_value = calculate_lfsr(MAX_SPU_COUNT-1); | |
930 | else | |
931 | lfsr_value = calculate_lfsr(spu_cycle_reset); | |
932 | ||
933 | /* must use a non zero value. Zero disables data collection. */ | |
934 | if (lfsr_value == 0) | |
935 | lfsr_value = calculate_lfsr(1); | |
936 | ||
937 | lfsr_value = lfsr_value << 8; /* shift lfsr to correct | |
938 | * register location | |
939 | */ | |
940 | ||
941 | /* debug bus setup */ | |
942 | ret = pm_rtas_activate_spu_profiling(cbe_cpu_to_node(cpu)); | |
943 | ||
944 | if (unlikely(ret)) { | |
945 | rtas_error = ret; | |
946 | goto out; | |
947 | } | |
948 | ||
949 | ||
950 | subfunc = 2; /* 2 - activate SPU tracing, 3 - deactivate */ | |
951 | ||
952 | /* start profiling */ | |
953 | ret = rtas_call(spu_rtas_token, 3, 1, NULL, subfunc, | |
954 | cbe_cpu_to_node(cpu), lfsr_value); | |
955 | ||
956 | if (unlikely(ret != 0)) { | |
957 | printk(KERN_ERR | |
958 | "%s: rtas call ibm,cbe-spu-perftools failed, return = %d\n", | |
e48b1b45 | 959 | __func__, ret); |
1474855d BN |
960 | rtas_error = -EIO; |
961 | goto out; | |
962 | } | |
963 | } | |
964 | ||
965 | rtas_error = start_spu_profiling(spu_cycle_reset); | |
966 | if (rtas_error) | |
967 | goto out_stop; | |
968 | ||
969 | oprofile_running = 1; | |
970 | return 0; | |
971 | ||
972 | out_stop: | |
973 | cell_global_stop_spu(); /* clean up the PMU/debug bus */ | |
18f2190d | 974 | out: |
1474855d | 975 | return rtas_error; |
18f2190d MJ |
976 | } |
977 | ||
1474855d | 978 | static int cell_global_start_ppu(struct op_counter_config *ctr) |
18f2190d | 979 | { |
1474855d | 980 | u32 cpu, i; |
18f2190d | 981 | u32 interrupt_mask = 0; |
18f2190d MJ |
982 | |
983 | /* This routine gets called once for the system. | |
984 | * There is one performance monitor per node, so we | |
985 | * only need to perform this function once per node. | |
986 | */ | |
987 | for_each_online_cpu(cpu) { | |
988 | if (cbe_get_hw_thread_id(cpu)) | |
989 | continue; | |
990 | ||
991 | interrupt_mask = 0; | |
992 | ||
993 | for (i = 0; i < num_counters; ++i) { | |
994 | if (ctr_enabled & (1 << i)) { | |
995 | cbe_write_ctr(cpu, i, reset_value[i]); | |
996 | enable_ctr(cpu, i, pm_regs.pm07_cntrl); | |
997 | interrupt_mask |= | |
998 | CBE_PM_CTR_OVERFLOW_INTR(i); | |
999 | } else { | |
1000 | /* Disable counter */ | |
1001 | cbe_write_pm07_control(cpu, i, 0); | |
1002 | } | |
1003 | } | |
1004 | ||
bcb63e25 | 1005 | cbe_get_and_clear_pm_interrupts(cpu); |
18f2190d MJ |
1006 | cbe_enable_pm_interrupts(cpu, hdw_thread, interrupt_mask); |
1007 | cbe_enable_pm(cpu); | |
1008 | } | |
1009 | ||
1010 | virt_cntr_inter_mask = interrupt_mask; | |
1011 | oprofile_running = 1; | |
1012 | smp_wmb(); | |
1013 | ||
1474855d BN |
1014 | /* |
1015 | * NOTE: start_virt_cntrs will result in cell_virtual_cntr() being | |
1016 | * executed which manipulates the PMU. We start the "virtual counter" | |
18f2190d MJ |
1017 | * here so that we do not need to synchronize access to the PMU in |
1018 | * the above for-loop. | |
1019 | */ | |
1020 | start_virt_cntrs(); | |
1474855d BN |
1021 | |
1022 | return 0; | |
18f2190d MJ |
1023 | } |
1024 | ||
1474855d BN |
1025 | static int cell_global_start(struct op_counter_config *ctr) |
1026 | { | |
1027 | if (spu_cycle_reset) | |
1028 | return cell_global_start_spu(ctr); | |
1029 | else | |
1030 | return cell_global_start_ppu(ctr); | |
1031 | } | |
1032 | ||
1033 | /* | |
1034 | * Note the generic OProfile stop calls do not support returning | |
1035 | * an error on stop. Hence, will not return an error if the FW | |
1036 | * calls fail on stop. Failure to reset the debug bus is not an issue. | |
1037 | * Failure to disable the SPU profiling is not an issue. The FW calls | |
1038 | * to enable the performance counters and debug bus will work even if | |
1039 | * the hardware was not cleanly reset. | |
1040 | */ | |
1041 | static void cell_global_stop_spu(void) | |
1042 | { | |
1043 | int subfunc, rtn_value; | |
1044 | unsigned int lfsr_value; | |
1045 | int cpu; | |
1046 | ||
1047 | oprofile_running = 0; | |
1048 | ||
1049 | #ifdef CONFIG_CPU_FREQ | |
1050 | cpufreq_unregister_notifier(&cpu_freq_notifier_block, | |
1051 | CPUFREQ_TRANSITION_NOTIFIER); | |
1052 | #endif | |
1053 | ||
1054 | for_each_online_cpu(cpu) { | |
1055 | if (cbe_get_hw_thread_id(cpu)) | |
1056 | continue; | |
1057 | ||
1058 | subfunc = 3; /* | |
1059 | * 2 - activate SPU tracing, | |
1060 | * 3 - deactivate | |
1061 | */ | |
1062 | lfsr_value = 0x8f100000; | |
1063 | ||
1064 | rtn_value = rtas_call(spu_rtas_token, 3, 1, NULL, | |
1065 | subfunc, cbe_cpu_to_node(cpu), | |
1066 | lfsr_value); | |
1067 | ||
1068 | if (unlikely(rtn_value != 0)) { | |
1069 | printk(KERN_ERR | |
1070 | "%s: rtas call ibm,cbe-spu-perftools failed, return = %d\n", | |
e48b1b45 | 1071 | __func__, rtn_value); |
1474855d BN |
1072 | } |
1073 | ||
1074 | /* Deactivate the signals */ | |
1075 | pm_rtas_reset_signals(cbe_cpu_to_node(cpu)); | |
1076 | } | |
1077 | ||
1078 | stop_spu_profiling(); | |
1079 | } | |
1080 | ||
1081 | static void cell_global_stop_ppu(void) | |
18f2190d MJ |
1082 | { |
1083 | int cpu; | |
1084 | ||
1474855d BN |
1085 | /* |
1086 | * This routine will be called once for the system. | |
18f2190d MJ |
1087 | * There is one performance monitor per node, so we |
1088 | * only need to perform this function once per node. | |
1089 | */ | |
1090 | del_timer_sync(&timer_virt_cntr); | |
1091 | oprofile_running = 0; | |
1092 | smp_wmb(); | |
1093 | ||
1094 | for_each_online_cpu(cpu) { | |
1095 | if (cbe_get_hw_thread_id(cpu)) | |
1096 | continue; | |
1097 | ||
1098 | cbe_sync_irq(cbe_cpu_to_node(cpu)); | |
1099 | /* Stop the counters */ | |
1100 | cbe_disable_pm(cpu); | |
1101 | ||
1102 | /* Deactivate the signals */ | |
1103 | pm_rtas_reset_signals(cbe_cpu_to_node(cpu)); | |
1104 | ||
1105 | /* Deactivate interrupts */ | |
1106 | cbe_disable_pm_interrupts(cpu); | |
1107 | } | |
1108 | } | |
1109 | ||
1474855d BN |
1110 | static void cell_global_stop(void) |
1111 | { | |
1112 | if (spu_cycle_reset) | |
1113 | cell_global_stop_spu(); | |
1114 | else | |
1115 | cell_global_stop_ppu(); | |
1116 | } | |
1117 | ||
1118 | static void cell_handle_interrupt(struct pt_regs *regs, | |
1119 | struct op_counter_config *ctr) | |
18f2190d MJ |
1120 | { |
1121 | u32 cpu; | |
1122 | u64 pc; | |
1123 | int is_kernel; | |
1124 | unsigned long flags = 0; | |
1125 | u32 interrupt_mask; | |
1126 | int i; | |
1127 | ||
1128 | cpu = smp_processor_id(); | |
1129 | ||
1474855d BN |
1130 | /* |
1131 | * Need to make sure the interrupt handler and the virt counter | |
18f2190d MJ |
1132 | * routine are not running at the same time. See the |
1133 | * cell_virtual_cntr() routine for additional comments. | |
1134 | */ | |
1135 | spin_lock_irqsave(&virt_cntr_lock, flags); | |
1136 | ||
1474855d BN |
1137 | /* |
1138 | * Need to disable and reenable the performance counters | |
18f2190d MJ |
1139 | * to get the desired behavior from the hardware. This |
1140 | * is hardware specific. | |
1141 | */ | |
1142 | ||
1143 | cbe_disable_pm(cpu); | |
1144 | ||
bcb63e25 | 1145 | interrupt_mask = cbe_get_and_clear_pm_interrupts(cpu); |
18f2190d | 1146 | |
1474855d BN |
1147 | /* |
1148 | * If the interrupt mask has been cleared, then the virt cntr | |
18f2190d MJ |
1149 | * has cleared the interrupt. When the thread that generated |
1150 | * the interrupt is restored, the data count will be restored to | |
1151 | * 0xffffff0 to cause the interrupt to be regenerated. | |
1152 | */ | |
1153 | ||
1154 | if ((oprofile_running == 1) && (interrupt_mask != 0)) { | |
1155 | pc = regs->nip; | |
1156 | is_kernel = is_kernel_addr(pc); | |
1157 | ||
1158 | for (i = 0; i < num_counters; ++i) { | |
1159 | if ((interrupt_mask & CBE_PM_CTR_OVERFLOW_INTR(i)) | |
1160 | && ctr[i].enabled) { | |
101fd46a | 1161 | oprofile_add_ext_sample(pc, regs, i, is_kernel); |
18f2190d MJ |
1162 | cbe_write_ctr(cpu, i, reset_value[i]); |
1163 | } | |
1164 | } | |
1165 | ||
1474855d BN |
1166 | /* |
1167 | * The counters were frozen by the interrupt. | |
18f2190d MJ |
1168 | * Reenable the interrupt and restart the counters. |
1169 | * If there was a race between the interrupt handler and | |
1474855d | 1170 | * the virtual counter routine. The virutal counter |
18f2190d MJ |
1171 | * routine may have cleared the interrupts. Hence must |
1172 | * use the virt_cntr_inter_mask to re-enable the interrupts. | |
1173 | */ | |
1174 | cbe_enable_pm_interrupts(cpu, hdw_thread, | |
1175 | virt_cntr_inter_mask); | |
1176 | ||
1474855d BN |
1177 | /* |
1178 | * The writes to the various performance counters only writes | |
1179 | * to a latch. The new values (interrupt setting bits, reset | |
18f2190d MJ |
1180 | * counter value etc.) are not copied to the actual registers |
1181 | * until the performance monitor is enabled. In order to get | |
1182 | * this to work as desired, the permormance monitor needs to | |
beb7dd86 | 1183 | * be disabled while writing to the latches. This is a |
18f2190d MJ |
1184 | * HW design issue. |
1185 | */ | |
1186 | cbe_enable_pm(cpu); | |
1187 | } | |
1188 | spin_unlock_irqrestore(&virt_cntr_lock, flags); | |
1189 | } | |
1190 | ||
1474855d BN |
1191 | /* |
1192 | * This function is called from the generic OProfile | |
1193 | * driver. When profiling PPUs, we need to do the | |
1194 | * generic sync start; otherwise, do spu_sync_start. | |
1195 | */ | |
1196 | static int cell_sync_start(void) | |
1197 | { | |
1198 | if (spu_cycle_reset) | |
1199 | return spu_sync_start(); | |
1200 | else | |
1201 | return DO_GENERIC_SYNC; | |
1202 | } | |
1203 | ||
1204 | static int cell_sync_stop(void) | |
1205 | { | |
1206 | if (spu_cycle_reset) | |
1207 | return spu_sync_stop(); | |
1208 | else | |
1209 | return 1; | |
1210 | } | |
1211 | ||
18f2190d MJ |
1212 | struct op_powerpc_model op_model_cell = { |
1213 | .reg_setup = cell_reg_setup, | |
1214 | .cpu_setup = cell_cpu_setup, | |
1215 | .global_start = cell_global_start, | |
1216 | .global_stop = cell_global_stop, | |
1474855d BN |
1217 | .sync_start = cell_sync_start, |
1218 | .sync_stop = cell_sync_stop, | |
18f2190d MJ |
1219 | .handle_interrupt = cell_handle_interrupt, |
1220 | }; |