44#include <machine/md_var.h>
45#include <machine/specialreg.h>
46
47/*
48 * PENTIUM 4 SUPPORT
49 *
50 * The P4 has 18 PMCs, divided into 4 groups with 4,4,4 and 6 PMCs
51 * respectively. Each PMC comprises of two model specific registers:
52 * a counter configuration control register (CCCR) and a counter
53 * register that holds the actual event counts.
54 *
55 * Configuring an event requires the use of one of 45 event selection
56 * control registers (ESCR). Events are associated with specific
57 * ESCRs. Each PMC group has a set of ESCRs it can use.
58 *
59 * - The BPU counter group (4 PMCs) can use the 16 ESCRs:
60 * BPU_ESCR{0,1}, IS_ESCR{0,1}, MOB_ESCR{0,1}, ITLB_ESCR{0,1},
61 * PMH_ESCR{0,1}, IX_ESCR{0,1}, FSB_ESCR{0,}, BSU_ESCR{0,1}.
62 *
63 * - The MS counter group (4 PMCs) can use the 6 ESCRs: MS_ESCR{0,1},
64 * TC_ESCR{0,1}, TBPU_ESCR{0,1}.
65 *
66 * - The FLAME counter group (4 PMCs) can use the 10 ESCRs:
67 * FLAME_ESCR{0,1}, FIRM_ESCR{0,1}, SAAT_ESCR{0,1}, U2L_ESCR{0,1},
68 * DAC_ESCR{0,1}.
69 *
70 * - The IQ counter group (6 PMCs) can use the 13 ESCRs: IQ_ESCR{0,1},
71 * ALF_ESCR{0,1}, RAT_ESCR{0,1}, SSU_ESCR0, CRU_ESCR{0,1,2,3,4,5}.
72 *
73 * Even-numbered ESCRs can be used with counters 0, 1 and 4 (if
74 * present) of a counter group. Odd-numbers ESCRs can be used with
75 * counters 2, 3 and 5 (if present) of a counter group. The
76 * 'p4_escrs[]' table describes these restrictions in a form that
77 * function 'p4_allocate()' uses for making allocation decisions.
78 *
79 * SYSTEM-MODE AND THREAD-MODE ALLOCATION
80 *
81 * In addition to remembering the state of PMC rows
82 * ('FREE','STANDALONE', or 'THREAD'), we similar need to track the
83 * state of ESCR rows. If an ESCR is allocated to a system-mode PMC
84 * on a CPU we cannot allocate this to a thread-mode PMC. On a
85 * multi-cpu (multiple physical CPUs) system, ESCR allocation on each
86 * CPU is tracked by the pc_escrs[] array.
87 *
88 * Each system-mode PMC that is using an ESCR records its row-index in
89 * the appropriate entry and system-mode allocation attempts check
90 * that an ESCR is available using this array. Process-mode PMCs do
91 * not use the pc_escrs[] array, since ESCR row itself would have been
92 * marked as in 'THREAD' mode.
93 *
94 * HYPERTHREADING SUPPORT
95 *
96 * When HTT is enabled, the FreeBSD kernel treats the two 'logical'
97 * cpus as independent CPUs and can schedule kernel threads on them
98 * independently. However, the two logical CPUs share the same set of
99 * PMC resources. We need to ensure that:
100 * - PMCs that use the PMC_F_DESCENDANTS semantics are handled correctly,
101 * and,
102 * - Threads of multi-threaded processes that get scheduled on the same
103 * physical CPU are handled correctly.
104 *
105 * HTT Detection
106 *
107 * Not all HTT capable systems will have HTT enabled. We detect the
108 * presence of HTT by detecting if 'p4_init()' was called for a secondary
109 * CPU in a HTT pair.
110 *
111 * Note that hwpmc(4) cannot currently deal with a change in HTT status once
112 * loaded.
113 *
114 * Handling HTT READ / WRITE / START / STOP
115 *
116 * PMC resources are shared across the CPUs in an HTT pair. We
117 * designate the lower numbered CPU in a HTT pair as the 'primary'
118 * CPU. In each primary CPU's state we keep track of a 'runcount'
119 * which reflects the number of PMC-using processes that have been
120 * scheduled on its secondary CPU. Process-mode PMC operations will
121 * actually 'start' or 'stop' hardware only if these are the first or
122 * last processes respectively to use the hardware. PMC values
123 * written by a 'write' operation are saved and are transferred to
124 * hardware at PMC 'start' time if the runcount is 0. If the runcount
125 * is greater than 0 at the time of a 'start' operation, we keep track
126 * of the actual hardware value at the time of the 'start' operation
127 * and use this to adjust the final readings at PMC 'stop' or 'read'
128 * time.
129 *
130 * Execution sequences:
131 *
132 * Case 1: CPUx +...- (no overlap)
133 * CPUy +...-
134 * RC 0 1 0 1 0
135 *
136 * Case 2: CPUx +........- (partial overlap)
137 * CPUy +........-
138 * RC 0 1 2 1 0
139 *
140 * Case 3: CPUx +..............- (fully overlapped)
141 * CPUy +.....-
142 * RC 0 1 2 1 0
143 *
144 * Key:
145 * 'CPU[xy]' : one of the two logical processors on a HTT CPU.
146 * 'RC' : run count (#threads per physical core).
147 * '+' : point in time when a thread is put on a CPU.
148 * '-' : point in time where a thread is taken off a CPU.
149 *
150 * Handling HTT CONFIG
151 *
152 * Different processes attached to the same PMC may get scheduled on
153 * the two logical processors in the package. We keep track of config
154 * and de-config operations using the CFGFLAGS fields of the per-physical
155 * cpu state.
156 */
157
158#define P4_PMCS() \
159 P4_PMC(BPU_COUNTER0) \
160 P4_PMC(BPU_COUNTER1) \
161 P4_PMC(BPU_COUNTER2) \
162 P4_PMC(BPU_COUNTER3) \
163 P4_PMC(MS_COUNTER0) \
164 P4_PMC(MS_COUNTER1) \
165 P4_PMC(MS_COUNTER2) \
166 P4_PMC(MS_COUNTER3) \
167 P4_PMC(FLAME_COUNTER0) \
168 P4_PMC(FLAME_COUNTER1) \
169 P4_PMC(FLAME_COUNTER2) \
170 P4_PMC(FLAME_COUNTER3) \
171 P4_PMC(IQ_COUNTER0) \
172 P4_PMC(IQ_COUNTER1) \
173 P4_PMC(IQ_COUNTER2) \
174 P4_PMC(IQ_COUNTER3) \
175 P4_PMC(IQ_COUNTER4) \
176 P4_PMC(IQ_COUNTER5) \
177 P4_PMC(NONE)
178
179enum pmc_p4pmc {
180#undef P4_PMC
181#define P4_PMC(N) P4_PMC_##N ,
182 P4_PMCS()
183};
184
185/*
186 * P4 ESCR descriptors
187 */
188
189#define P4_ESCRS() \
190 P4_ESCR(BSU_ESCR0, 0x3A0, BPU_COUNTER0, BPU_COUNTER1, NONE) \
191 P4_ESCR(BSU_ESCR1, 0x3A1, BPU_COUNTER2, BPU_COUNTER3, NONE) \
192 P4_ESCR(FSB_ESCR0, 0x3A2, BPU_COUNTER0, BPU_COUNTER1, NONE) \
193 P4_ESCR(FSB_ESCR1, 0x3A3, BPU_COUNTER2, BPU_COUNTER3, NONE) \
194 P4_ESCR(FIRM_ESCR0, 0x3A4, FLAME_COUNTER0, FLAME_COUNTER1, NONE) \
195 P4_ESCR(FIRM_ESCR1, 0x3A5, FLAME_COUNTER2, FLAME_COUNTER3, NONE) \
196 P4_ESCR(FLAME_ESCR0, 0x3A6, FLAME_COUNTER0, FLAME_COUNTER1, NONE) \
197 P4_ESCR(FLAME_ESCR1, 0x3A7, FLAME_COUNTER2, FLAME_COUNTER3, NONE) \
198 P4_ESCR(DAC_ESCR0, 0x3A8, FLAME_COUNTER0, FLAME_COUNTER1, NONE) \
199 P4_ESCR(DAC_ESCR1, 0x3A9, FLAME_COUNTER2, FLAME_COUNTER3, NONE) \
200 P4_ESCR(MOB_ESCR0, 0x3AA, BPU_COUNTER0, BPU_COUNTER1, NONE) \
201 P4_ESCR(MOB_ESCR1, 0x3AB, BPU_COUNTER2, BPU_COUNTER3, NONE) \
202 P4_ESCR(PMH_ESCR0, 0x3AC, BPU_COUNTER0, BPU_COUNTER1, NONE) \
203 P4_ESCR(PMH_ESCR1, 0x3AD, BPU_COUNTER2, BPU_COUNTER3, NONE) \
204 P4_ESCR(SAAT_ESCR0, 0x3AE, FLAME_COUNTER0, FLAME_COUNTER1, NONE) \
205 P4_ESCR(SAAT_ESCR1, 0x3AF, FLAME_COUNTER2, FLAME_COUNTER3, NONE) \
206 P4_ESCR(U2L_ESCR0, 0x3B0, FLAME_COUNTER0, FLAME_COUNTER1, NONE) \
207 P4_ESCR(U2L_ESCR1, 0x3B1, FLAME_COUNTER2, FLAME_COUNTER3, NONE) \
208 P4_ESCR(BPU_ESCR0, 0x3B2, BPU_COUNTER0, BPU_COUNTER1, NONE) \
209 P4_ESCR(BPU_ESCR1, 0x3B3, BPU_COUNTER2, BPU_COUNTER3, NONE) \
210 P4_ESCR(IS_ESCR0, 0x3B4, BPU_COUNTER0, BPU_COUNTER1, NONE) \
211 P4_ESCR(IS_ESCR1, 0x3B5, BPU_COUNTER2, BPU_COUNTER3, NONE) \
212 P4_ESCR(ITLB_ESCR0, 0x3B6, BPU_COUNTER0, BPU_COUNTER1, NONE) \
213 P4_ESCR(ITLB_ESCR1, 0x3B7, BPU_COUNTER2, BPU_COUNTER3, NONE) \
214 P4_ESCR(CRU_ESCR0, 0x3B8, IQ_COUNTER0, IQ_COUNTER1, IQ_COUNTER4) \
215 P4_ESCR(CRU_ESCR1, 0x3B9, IQ_COUNTER2, IQ_COUNTER3, IQ_COUNTER5) \
216 P4_ESCR(IQ_ESCR0, 0x3BA, IQ_COUNTER0, IQ_COUNTER1, IQ_COUNTER4) \
217 P4_ESCR(IQ_ESCR1, 0x3BB, IQ_COUNTER1, IQ_COUNTER3, IQ_COUNTER5) \
218 P4_ESCR(RAT_ESCR0, 0x3BC, IQ_COUNTER0, IQ_COUNTER1, IQ_COUNTER4) \
219 P4_ESCR(RAT_ESCR1, 0x3BD, IQ_COUNTER2, IQ_COUNTER3, IQ_COUNTER5) \
220 P4_ESCR(SSU_ESCR0, 0x3BE, IQ_COUNTER0, IQ_COUNTER2, IQ_COUNTER4) \
221 P4_ESCR(MS_ESCR0, 0x3C0, MS_COUNTER0, MS_COUNTER1, NONE) \
222 P4_ESCR(MS_ESCR1, 0x3C1, MS_COUNTER2, MS_COUNTER3, NONE) \
223 P4_ESCR(TBPU_ESCR0, 0x3C2, MS_COUNTER0, MS_COUNTER1, NONE) \
224 P4_ESCR(TBPU_ESCR1, 0x3C3, MS_COUNTER2, MS_COUNTER3, NONE) \
225 P4_ESCR(TC_ESCR0, 0x3C4, MS_COUNTER0, MS_COUNTER1, NONE) \
226 P4_ESCR(TC_ESCR1, 0x3C5, MS_COUNTER2, MS_COUNTER3, NONE) \
227 P4_ESCR(IX_ESCR0, 0x3C8, BPU_COUNTER0, BPU_COUNTER1, NONE) \
228 P4_ESCR(IX_ESCR1, 0x3C9, BPU_COUNTER2, BPU_COUNTER3, NONE) \
229 P4_ESCR(ALF_ESCR0, 0x3CA, IQ_COUNTER0, IQ_COUNTER1, IQ_COUNTER4) \
230 P4_ESCR(ALF_ESCR1, 0x3CB, IQ_COUNTER2, IQ_COUNTER3, IQ_COUNTER5) \
231 P4_ESCR(CRU_ESCR2, 0x3CC, IQ_COUNTER0, IQ_COUNTER1, IQ_COUNTER4) \
232 P4_ESCR(CRU_ESCR3, 0x3CD, IQ_COUNTER2, IQ_COUNTER3, IQ_COUNTER5) \
233 P4_ESCR(CRU_ESCR4, 0x3E0, IQ_COUNTER0, IQ_COUNTER1, IQ_COUNTER4) \
234 P4_ESCR(CRU_ESCR5, 0x3E1, IQ_COUNTER2, IQ_COUNTER3, IQ_COUNTER5) \
235 P4_ESCR(NONE, ~0, NONE, NONE, NONE)
236
237enum pmc_p4escr {
238#define P4_ESCR(N, MSR, P1, P2, P3) P4_ESCR_##N ,
239 P4_ESCRS()
240#undef P4_ESCR
241};
242
243struct pmc_p4escr_descr {
244 const char pm_escrname[PMC_NAME_MAX];
245 u_short pm_escr_msr;
246 const enum pmc_p4pmc pm_pmcs[P4_MAX_PMC_PER_ESCR];
247};
248
249static struct pmc_p4escr_descr p4_escrs[] =
250{
251#define P4_ESCR(N, MSR, P1, P2, P3) \
252 { \
253 .pm_escrname = #N, \
254 .pm_escr_msr = (MSR), \
255 .pm_pmcs = \
256 { \
257 P4_PMC_##P1, \
258 P4_PMC_##P2, \
259 P4_PMC_##P3 \
260 } \
261 } ,
262
263 P4_ESCRS()
264
265#undef P4_ESCR
266};
267
268/*
269 * P4 Event descriptor
270 */
271
272struct p4_event_descr {
273 const enum pmc_event pm_event;
274 const uint32_t pm_escr_eventselect;
275 const uint32_t pm_cccr_select;
276 const char pm_is_ti_event;
277 enum pmc_p4escr pm_escrs[P4_MAX_ESCR_PER_EVENT];
278};
279
280static struct p4_event_descr p4_events[] = {
281
282#define P4_EVDESCR(NAME, ESCREVENTSEL, CCCRSEL, TI_EVENT, ESCR0, ESCR1) \
283 { \
284 .pm_event = PMC_EV_P4_##NAME, \
285 .pm_escr_eventselect = (ESCREVENTSEL), \
286 .pm_cccr_select = (CCCRSEL), \
287 .pm_is_ti_event = (TI_EVENT), \
288 .pm_escrs = \
289 { \
290 P4_ESCR_##ESCR0, \
291 P4_ESCR_##ESCR1 \
292 } \
293 }
294
295P4_EVDESCR(TC_DELIVER_MODE, 0x01, 0x01, TRUE, TC_ESCR0, TC_ESCR1),
296P4_EVDESCR(BPU_FETCH_REQUEST, 0x03, 0x00, FALSE, BPU_ESCR0, BPU_ESCR1),
297P4_EVDESCR(ITLB_REFERENCE, 0x18, 0x03, FALSE, ITLB_ESCR0, ITLB_ESCR1),
298P4_EVDESCR(MEMORY_CANCEL, 0x02, 0x05, FALSE, DAC_ESCR0, DAC_ESCR1),
299P4_EVDESCR(MEMORY_COMPLETE, 0x08, 0x02, FALSE, SAAT_ESCR0, SAAT_ESCR1),
300P4_EVDESCR(LOAD_PORT_REPLAY, 0x04, 0x02, FALSE, SAAT_ESCR0, SAAT_ESCR1),
301P4_EVDESCR(STORE_PORT_REPLAY, 0x05, 0x02, FALSE, SAAT_ESCR0, SAAT_ESCR1),
302P4_EVDESCR(MOB_LOAD_REPLAY, 0x03, 0x02, FALSE, MOB_ESCR0, MOB_ESCR1),
303P4_EVDESCR(PAGE_WALK_TYPE, 0x01, 0x04, TRUE, PMH_ESCR0, PMH_ESCR1),
304P4_EVDESCR(BSQ_CACHE_REFERENCE, 0x0C, 0x07, FALSE, BSU_ESCR0, BSU_ESCR1),
305P4_EVDESCR(IOQ_ALLOCATION, 0x03, 0x06, FALSE, FSB_ESCR0, FSB_ESCR1),
306P4_EVDESCR(IOQ_ACTIVE_ENTRIES, 0x1A, 0x06, FALSE, FSB_ESCR1, NONE),
307P4_EVDESCR(FSB_DATA_ACTIVITY, 0x17, 0x06, TRUE, FSB_ESCR0, FSB_ESCR1),
308P4_EVDESCR(BSQ_ALLOCATION, 0x05, 0x07, FALSE, BSU_ESCR0, NONE),
309P4_EVDESCR(BSQ_ACTIVE_ENTRIES, 0x06, 0x07, FALSE, BSU_ESCR1, NONE),
310 /* BSQ_ACTIVE_ENTRIES inherits CPU specificity from BSQ_ALLOCATION */
311P4_EVDESCR(SSE_INPUT_ASSIST, 0x34, 0x01, TRUE, FIRM_ESCR0, FIRM_ESCR1),
312P4_EVDESCR(PACKED_SP_UOP, 0x08, 0x01, TRUE, FIRM_ESCR0, FIRM_ESCR1),
313P4_EVDESCR(PACKED_DP_UOP, 0x0C, 0x01, TRUE, FIRM_ESCR0, FIRM_ESCR1),
314P4_EVDESCR(SCALAR_SP_UOP, 0x0A, 0x01, TRUE, FIRM_ESCR0, FIRM_ESCR1),
315P4_EVDESCR(SCALAR_DP_UOP, 0x0E, 0x01, TRUE, FIRM_ESCR0, FIRM_ESCR1),
316P4_EVDESCR(64BIT_MMX_UOP, 0x02, 0x01, TRUE, FIRM_ESCR0, FIRM_ESCR1),
317P4_EVDESCR(128BIT_MMX_UOP, 0x1A, 0x01, TRUE, FIRM_ESCR0, FIRM_ESCR1),
318P4_EVDESCR(X87_FP_UOP, 0x04, 0x01, TRUE, FIRM_ESCR0, FIRM_ESCR1),
319P4_EVDESCR(X87_SIMD_MOVES_UOP, 0x2E, 0x01, TRUE, FIRM_ESCR0, FIRM_ESCR1),
320P4_EVDESCR(GLOBAL_POWER_EVENTS, 0x13, 0x06, FALSE, FSB_ESCR0, FSB_ESCR1),
321P4_EVDESCR(TC_MS_XFER, 0x05, 0x00, FALSE, MS_ESCR0, MS_ESCR1),
322P4_EVDESCR(UOP_QUEUE_WRITES, 0x09, 0x00, FALSE, MS_ESCR0, MS_ESCR1),
323P4_EVDESCR(RETIRED_MISPRED_BRANCH_TYPE,
324 0x05, 0x02, FALSE, TBPU_ESCR0, TBPU_ESCR1),
325P4_EVDESCR(RETIRED_BRANCH_TYPE, 0x04, 0x02, FALSE, TBPU_ESCR0, TBPU_ESCR1),
326P4_EVDESCR(RESOURCE_STALL, 0x01, 0x01, FALSE, ALF_ESCR0, ALF_ESCR1),
327P4_EVDESCR(WC_BUFFER, 0x05, 0x05, TRUE, DAC_ESCR0, DAC_ESCR1),
328P4_EVDESCR(B2B_CYCLES, 0x16, 0x03, TRUE, FSB_ESCR0, FSB_ESCR1),
329P4_EVDESCR(BNR, 0x08, 0x03, TRUE, FSB_ESCR0, FSB_ESCR1),
330P4_EVDESCR(SNOOP, 0x06, 0x03, TRUE, FSB_ESCR0, FSB_ESCR1),
331P4_EVDESCR(RESPONSE, 0x04, 0x03, TRUE, FSB_ESCR0, FSB_ESCR1),
332P4_EVDESCR(FRONT_END_EVENT, 0x08, 0x05, FALSE, CRU_ESCR2, CRU_ESCR3),
333P4_EVDESCR(EXECUTION_EVENT, 0x0C, 0x05, FALSE, CRU_ESCR2, CRU_ESCR3),
334P4_EVDESCR(REPLAY_EVENT, 0x09, 0x05, FALSE, CRU_ESCR2, CRU_ESCR3),
335P4_EVDESCR(INSTR_RETIRED, 0x02, 0x04, FALSE, CRU_ESCR0, CRU_ESCR1),
336P4_EVDESCR(UOPS_RETIRED, 0x01, 0x04, FALSE, CRU_ESCR0, CRU_ESCR1),
337P4_EVDESCR(UOP_TYPE, 0x02, 0x02, FALSE, RAT_ESCR0, RAT_ESCR1),
338P4_EVDESCR(BRANCH_RETIRED, 0x06, 0x05, FALSE, CRU_ESCR2, CRU_ESCR3),
339P4_EVDESCR(MISPRED_BRANCH_RETIRED, 0x03, 0x04, FALSE, CRU_ESCR0, CRU_ESCR1),
340P4_EVDESCR(X87_ASSIST, 0x03, 0x05, FALSE, CRU_ESCR2, CRU_ESCR3),
341P4_EVDESCR(MACHINE_CLEAR, 0x02, 0x05, FALSE, CRU_ESCR2, CRU_ESCR3)
342
343#undef P4_EVDESCR
344};
345
346#define P4_EVENT_IS_TI(E) ((E)->pm_is_ti_event == TRUE)
347
348#define P4_NEVENTS (PMC_EV_P4_LAST - PMC_EV_P4_FIRST + 1)
349
350/*
351 * P4 PMC descriptors
352 */
353
354struct p4pmc_descr {
355 struct pmc_descr pm_descr; /* common information */
356 enum pmc_p4pmc pm_pmcnum; /* PMC number */
357 uint32_t pm_pmc_msr; /* PERFCTR MSR address */
358 uint32_t pm_cccr_msr; /* CCCR MSR address */
359};
360
361static struct p4pmc_descr p4_pmcdesc[P4_NPMCS] = {
362#define P4_PMC_CAPS (PMC_CAP_INTERRUPT | PMC_CAP_USER | PMC_CAP_SYSTEM | \
363 PMC_CAP_EDGE | PMC_CAP_THRESHOLD | PMC_CAP_READ | PMC_CAP_WRITE | \
364 PMC_CAP_INVERT | PMC_CAP_QUALIFIER | PMC_CAP_PRECISE | \
365 PMC_CAP_TAGGING | PMC_CAP_CASCADE)
366
367#define P4_PMCDESCR(N, PMC, CCCR) \
368 { \
369 .pm_descr = \
370 { \
371 .pd_name = #N, \
372 .pd_class = PMC_CLASS_P4, \
373 .pd_caps = P4_PMC_CAPS, \
374 .pd_width = 40 \
375 }, \
376 .pm_pmcnum = P4_PMC_##N, \
377 .pm_cccr_msr = (CCCR), \
378 .pm_pmc_msr = (PMC) \
379 }
380
381 P4_PMCDESCR(BPU_COUNTER0, 0x300, 0x360),
382 P4_PMCDESCR(BPU_COUNTER1, 0x301, 0x361),
383 P4_PMCDESCR(BPU_COUNTER2, 0x302, 0x362),
384 P4_PMCDESCR(BPU_COUNTER3, 0x303, 0x363),
385 P4_PMCDESCR(MS_COUNTER0, 0x304, 0x364),
386 P4_PMCDESCR(MS_COUNTER1, 0x305, 0x365),
387 P4_PMCDESCR(MS_COUNTER2, 0x306, 0x366),
388 P4_PMCDESCR(MS_COUNTER3, 0x307, 0x367),
389 P4_PMCDESCR(FLAME_COUNTER0, 0x308, 0x368),
390 P4_PMCDESCR(FLAME_COUNTER1, 0x309, 0x369),
391 P4_PMCDESCR(FLAME_COUNTER2, 0x30A, 0x36A),
392 P4_PMCDESCR(FLAME_COUNTER3, 0x30B, 0x36B),
393 P4_PMCDESCR(IQ_COUNTER0, 0x30C, 0x36C),
394 P4_PMCDESCR(IQ_COUNTER1, 0x30D, 0x36D),
395 P4_PMCDESCR(IQ_COUNTER2, 0x30E, 0x36E),
396 P4_PMCDESCR(IQ_COUNTER3, 0x30F, 0x36F),
397 P4_PMCDESCR(IQ_COUNTER4, 0x310, 0x370),
398 P4_PMCDESCR(IQ_COUNTER5, 0x311, 0x371),
399
400#undef P4_PMCDESCR
401};
402
403/* HTT support */
404#define P4_NHTT 2 /* logical processors/chip */
405
406static int p4_system_has_htt;
407
408/*
409 * Per-CPU data structure for P4 class CPUs
410 *
411 * [19 struct pmc_hw structures]
412 * [45 ESCRs status bytes]
413 * [per-cpu spin mutex]
414 * [19 flag fields for holding config flags and a runcount]
415 * [19*2 hw value fields] (Thread mode PMC support)
416 * or
417 * [19*2 EIP values] (Sampling mode PMCs)
418 * [19*2 pmc value fields] (Thread mode PMC support))
419 */
420
421struct p4_cpu {
422 struct pmc_hw pc_p4pmcs[P4_NPMCS];
423 char pc_escrs[P4_NESCR];
424 struct mtx pc_mtx; /* spin lock */
425 uint32_t pc_intrflag; /* NMI handler flags */
426 unsigned int pc_intrlock; /* NMI handler spin lock */
427 unsigned char pc_flags[P4_NPMCS]; /* 4 bits each: {cfg,run}count */
428 union {
429 pmc_value_t pc_hw[P4_NPMCS * P4_NHTT];
430 uintptr_t pc_ip[P4_NPMCS * P4_NHTT];
431 } pc_si;
432 pmc_value_t pc_pmc_values[P4_NPMCS * P4_NHTT];
433};
434
435static struct p4_cpu **p4_pcpu;
436
437#define P4_PCPU_PMC_VALUE(PC,RI,CPU) (PC)->pc_pmc_values[(RI)*((CPU) & 1)]
438#define P4_PCPU_HW_VALUE(PC,RI,CPU) (PC)->pc_si.pc_hw[(RI)*((CPU) & 1)]
439#define P4_PCPU_SAVED_IP(PC,RI,CPU) (PC)->pc_si.pc_ip[(RI)*((CPU) & 1)]
440
441#define P4_PCPU_GET_FLAGS(PC,RI,MASK) ((PC)->pc_flags[(RI)] & (MASK))
442#define P4_PCPU_SET_FLAGS(PC,RI,MASK,VAL) do { \
443 char _tmp; \
444 _tmp = (PC)->pc_flags[(RI)]; \
445 _tmp &= ~(MASK); \
446 _tmp |= (VAL) & (MASK); \
447 (PC)->pc_flags[(RI)] = _tmp; \
448} while (0)
449
450#define P4_PCPU_GET_RUNCOUNT(PC,RI) P4_PCPU_GET_FLAGS(PC,RI,0x0F)
451#define P4_PCPU_SET_RUNCOUNT(PC,RI,V) P4_PCPU_SET_FLAGS(PC,RI,0x0F,V)
452
453#define P4_PCPU_GET_CFGFLAGS(PC,RI) (P4_PCPU_GET_FLAGS(PC,RI,0xF0) >> 4)
454#define P4_PCPU_SET_CFGFLAGS(PC,RI,C) P4_PCPU_SET_FLAGS(PC,RI,0xF0,((C) <<4))
455
456#define P4_CPU_TO_FLAG(C) (P4_CPU_IS_HTT_SECONDARY(cpu) ? 0x2 : 0x1)
457
458#define P4_PCPU_GET_INTRFLAG(PC,I) ((PC)->pc_intrflag & (1 << (I)))
459#define P4_PCPU_SET_INTRFLAG(PC,I,V) do { \
460 uint32_t __mask; \
461 __mask = 1 << (I); \
462 if ((V)) \
463 (PC)->pc_intrflag |= __mask; \
464 else \
465 (PC)->pc_intrflag &= ~__mask; \
466 } while (0)
467
468/*
469 * A minimal spin lock implementation for use inside the NMI handler.
470 *
471 * We don't want to use a regular spin lock here, because curthread
472 * may not be consistent at the time the handler is invoked.
473 */
474#define P4_PCPU_ACQ_INTR_SPINLOCK(PC) do { \
475 while (!atomic_cmpset_acq_int(&pc->pc_intrlock, 0, 1)) \
476 ia32_pause(); \
477 } while (0)
478#define P4_PCPU_REL_INTR_SPINLOCK(PC) \
479 atomic_store_rel_int(&pc->pc_intrlock, 0);
480
481/* ESCR row disposition */
482static int p4_escrdisp[P4_NESCR];
483
484#define P4_ESCR_ROW_DISP_IS_THREAD(E) (p4_escrdisp[(E)] > 0)
485#define P4_ESCR_ROW_DISP_IS_STANDALONE(E) (p4_escrdisp[(E)] < 0)
486#define P4_ESCR_ROW_DISP_IS_FREE(E) (p4_escrdisp[(E)] == 0)
487
488#define P4_ESCR_MARK_ROW_STANDALONE(E) do { \
489 KASSERT(p4_escrdisp[(E)] <= 0, ("[p4,%d] row disposition error",\
490 __LINE__)); \
491 atomic_add_int(&p4_escrdisp[(E)], -1); \
492 KASSERT(p4_escrdisp[(E)] >= (-pmc_cpu_max_active()), \
493 ("[p4,%d] row disposition error", __LINE__)); \
494} while (0)
495
496#define P4_ESCR_UNMARK_ROW_STANDALONE(E) do { \
497 atomic_add_int(&p4_escrdisp[(E)], 1); \
498 KASSERT(p4_escrdisp[(E)] <= 0, ("[p4,%d] row disposition error",\
499 __LINE__)); \
500} while (0)
501
502#define P4_ESCR_MARK_ROW_THREAD(E) do { \
503 KASSERT(p4_escrdisp[(E)] >= 0, ("[p4,%d] row disposition error", \
504 __LINE__)); \
505 atomic_add_int(&p4_escrdisp[(E)], 1); \
506} while (0)
507
508#define P4_ESCR_UNMARK_ROW_THREAD(E) do { \
509 atomic_add_int(&p4_escrdisp[(E)], -1); \
510 KASSERT(p4_escrdisp[(E)] >= 0, ("[p4,%d] row disposition error", \
511 __LINE__)); \
512} while (0)
513
514#define P4_PMC_IS_STOPPED(cccr) ((rdmsr(cccr) & P4_CCCR_ENABLE) == 0)
515
516#define P4_CPU_IS_HTT_SECONDARY(cpu) \
517 (p4_system_has_htt ? ((cpu) & 1) : 0)
518#define P4_TO_HTT_PRIMARY(cpu) \
519 (p4_system_has_htt ? ((cpu) & ~1) : (cpu))
520
521#define P4_CCCR_Tx_MASK (~(P4_CCCR_OVF_PMI_T0|P4_CCCR_OVF_PMI_T1| \
522 P4_CCCR_ENABLE|P4_CCCR_OVF))
523#define P4_ESCR_Tx_MASK (~(P4_ESCR_T0_OS|P4_ESCR_T0_USR|P4_ESCR_T1_OS| \
524 P4_ESCR_T1_USR))
525
526/*
527 * support routines
528 */
529
530static struct p4_event_descr *
531p4_find_event(enum pmc_event ev)
532{
533 int n;
534
535 for (n = 0; n < P4_NEVENTS; n++)
536 if (p4_events[n].pm_event == ev)
537 break;
538 if (n == P4_NEVENTS)
539 return (NULL);
540 return (&p4_events[n]);
541}
542
543/*
544 * Initialize per-cpu state
545 */
546
547static int
548p4_pcpu_init(struct pmc_mdep *md, int cpu)
549{
550 char *pescr;
551 int n, first_ri, phycpu;
552 struct pmc_hw *phw;
553 struct p4_cpu *p4c;
554 struct pmc_cpu *pc, *plc;
555
556 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
557 ("[p4,%d] insane cpu number %d", __LINE__, cpu));
558
559 PMCDBG(MDP,INI,0, "p4-init cpu=%d is-primary=%d", cpu,
560 pmc_cpu_is_primary(cpu) != 0);
561
562 first_ri = md->pmd_classdep[PMC_MDEP_CLASS_INDEX_P4].pcd_ri;
563
564 /*
565 * The two CPUs in an HT pair share their per-cpu state.
566 *
567 * For HT capable CPUs, we assume that the two logical
568 * processors in the HT pair get two consecutive CPU ids
569 * starting with an even id #.
570 *
571 * The primary CPU (the even numbered CPU of the pair) would
572 * have been initialized prior to the initialization for the
573 * secondary.
574 */
575
576 if (!pmc_cpu_is_primary(cpu) && (cpu & 1)) {
577
578 p4_system_has_htt = 1;
579
580 phycpu = P4_TO_HTT_PRIMARY(cpu);
581 pc = pmc_pcpu[phycpu];
582 plc = pmc_pcpu[cpu];
583
584 KASSERT(plc != pc, ("[p4,%d] per-cpu config error", __LINE__));
585
586 PMCDBG(MDP,INI,1, "p4-init cpu=%d phycpu=%d pc=%p", cpu,
587 phycpu, pc);
588 KASSERT(pc, ("[p4,%d] Null Per-Cpu state cpu=%d phycpu=%d",
589 __LINE__, cpu, phycpu));
590
591 /* PMCs are shared with the physical CPU. */
592 for (n = 0; n < P4_NPMCS; n++)
593 plc->pc_hwpmcs[n + first_ri] =
594 pc->pc_hwpmcs[n + first_ri];
595
596 return (0);
597 }
598
599 p4c = malloc(sizeof(struct p4_cpu), M_PMC, M_WAITOK|M_ZERO);
600
601 if (p4c == NULL)
602 return (ENOMEM);
603
604 pc = pmc_pcpu[cpu];
605
606 KASSERT(pc != NULL, ("[p4,%d] cpu %d null per-cpu", __LINE__, cpu));
607
608 p4_pcpu[cpu] = p4c;
609 phw = p4c->pc_p4pmcs;
610
611 for (n = 0; n < P4_NPMCS; n++, phw++) {
612 phw->phw_state = PMC_PHW_FLAG_IS_ENABLED |
613 PMC_PHW_CPU_TO_STATE(cpu) | PMC_PHW_INDEX_TO_STATE(n);
614 phw->phw_pmc = NULL;
615 pc->pc_hwpmcs[n + first_ri] = phw;
616 }
617
618 pescr = p4c->pc_escrs;
619 for (n = 0; n < P4_NESCR; n++)
620 *pescr++ = P4_INVALID_PMC_INDEX;
621
622 mtx_init(&p4c->pc_mtx, "p4-pcpu", "pmc-leaf", MTX_SPIN);
623
624 return (0);
625}
626
627/*
628 * Destroy per-cpu state.
629 */
630
631static int
632p4_pcpu_fini(struct pmc_mdep *md, int cpu)
633{
634 int first_ri, i;
635 struct p4_cpu *p4c;
636 struct pmc_cpu *pc;
637
638 PMCDBG(MDP,INI,0, "p4-cleanup cpu=%d", cpu);
639
640 pc = pmc_pcpu[cpu];
641 first_ri = md->pmd_classdep[PMC_MDEP_CLASS_INDEX_P4].pcd_ri;
642
643 for (i = 0; i < P4_NPMCS; i++)
644 pc->pc_hwpmcs[i + first_ri] = NULL;
645
646 if (!pmc_cpu_is_primary(cpu) && (cpu & 1))
647 return (0);
648
649 p4c = p4_pcpu[cpu];
650
651 KASSERT(p4c != NULL, ("[p4,%d] NULL pcpu", __LINE__));
652
653 /* Turn off all PMCs on this CPU */
654 for (i = 0; i < P4_NPMCS - 1; i++)
655 wrmsr(P4_CCCR_MSR_FIRST + i,
656 rdmsr(P4_CCCR_MSR_FIRST + i) & ~P4_CCCR_ENABLE);
657
658 mtx_destroy(&p4c->pc_mtx);
659
660 free(p4c, M_PMC);
661
662 p4_pcpu[cpu] = NULL;
663
664 return (0);
665}
666
667/*
668 * Read a PMC
669 */
670
671static int
672p4_read_pmc(int cpu, int ri, pmc_value_t *v)
673{
674 struct pmc *pm;
675 pmc_value_t tmp;
676 struct p4_cpu *pc;
677 enum pmc_mode mode;
678 struct p4pmc_descr *pd;
679
680 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
681 ("[p4,%d] illegal CPU value %d", __LINE__, cpu));
682 KASSERT(ri >= 0 && ri < P4_NPMCS,
683 ("[p4,%d] illegal row-index %d", __LINE__, ri));
684
685 pc = p4_pcpu[P4_TO_HTT_PRIMARY(cpu)];
686 pm = pc->pc_p4pmcs[ri].phw_pmc;
687 pd = &p4_pmcdesc[ri];
688
689 KASSERT(pm != NULL,
690 ("[p4,%d] No owner for HWPMC [cpu%d,pmc%d]", __LINE__, cpu, ri));
691
692 KASSERT(pd->pm_descr.pd_class == PMC_TO_CLASS(pm),
693 ("[p4,%d] class mismatch pd %d != id class %d", __LINE__,
694 pd->pm_descr.pd_class, PMC_TO_CLASS(pm)));
695
696 mode = PMC_TO_MODE(pm);
697
698 PMCDBG(MDP,REA,1, "p4-read cpu=%d ri=%d mode=%d", cpu, ri, mode);
699
700 KASSERT(pd->pm_descr.pd_class == PMC_CLASS_P4,
701 ("[p4,%d] unknown PMC class %d", __LINE__, pd->pm_descr.pd_class));
702
703 tmp = rdmsr(p4_pmcdesc[ri].pm_pmc_msr);
704
705 if (PMC_IS_VIRTUAL_MODE(mode)) {
706 if (tmp < P4_PCPU_HW_VALUE(pc,ri,cpu)) /* 40 bit overflow */
707 tmp += (P4_PERFCTR_MASK + 1) -
708 P4_PCPU_HW_VALUE(pc,ri,cpu);
709 else
710 tmp -= P4_PCPU_HW_VALUE(pc,ri,cpu);
711 tmp += P4_PCPU_PMC_VALUE(pc,ri,cpu);
712 }
713
714 if (PMC_IS_SAMPLING_MODE(mode)) /* undo transformation */
715 *v = P4_PERFCTR_VALUE_TO_RELOAD_COUNT(tmp);
716 else
717 *v = tmp;
718
719 PMCDBG(MDP,REA,2, "p4-read -> %jx", *v);
720
721 return (0);
722}
723
724/*
725 * Write a PMC
726 */
727
728static int
729p4_write_pmc(int cpu, int ri, pmc_value_t v)
730{
731 enum pmc_mode mode;
732 struct pmc *pm;
733 struct p4_cpu *pc;
734 const struct pmc_hw *phw;
735 const struct p4pmc_descr *pd;
736
737 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
738 ("[amd,%d] illegal CPU value %d", __LINE__, cpu));
739 KASSERT(ri >= 0 && ri < P4_NPMCS,
740 ("[amd,%d] illegal row-index %d", __LINE__, ri));
741
742 pc = p4_pcpu[P4_TO_HTT_PRIMARY(cpu)];
743 phw = &pc->pc_p4pmcs[ri];
744 pm = phw->phw_pmc;
745 pd = &p4_pmcdesc[ri];
746
747 KASSERT(pm != NULL,
748 ("[p4,%d] No owner for HWPMC [cpu%d,pmc%d]", __LINE__,
749 cpu, ri));
750
751 mode = PMC_TO_MODE(pm);
752
753 PMCDBG(MDP,WRI,1, "p4-write cpu=%d ri=%d mode=%d v=%jx", cpu, ri,
754 mode, v);
755
756 /*
757 * write the PMC value to the register/saved value: for
758 * sampling mode PMCs, the value to be programmed into the PMC
759 * counter is -(C+1) where 'C' is the requested sample rate.
760 */
761 if (PMC_IS_SAMPLING_MODE(mode))
762 v = P4_RELOAD_COUNT_TO_PERFCTR_VALUE(v);
763
764 if (PMC_IS_SYSTEM_MODE(mode))
765 wrmsr(pd->pm_pmc_msr, v);
766 else
767 P4_PCPU_PMC_VALUE(pc,ri,cpu) = v;
768
769 return (0);
770}
771
772/*
773 * Configure a PMC 'pm' on the given CPU and row-index.
774 *
775 * 'pm' may be NULL to indicate de-configuration.
776 *
777 * On HTT systems, a PMC may get configured twice, once for each
778 * "logical" CPU. We track this using the CFGFLAGS field of the
779 * per-cpu state; this field is a bit mask with one bit each for
780 * logical CPUs 0 & 1.
781 */
782
783static int
784p4_config_pmc(int cpu, int ri, struct pmc *pm)
785{
786 struct pmc_hw *phw;
787 struct p4_cpu *pc;
788 int cfgflags, cpuflag;
789
790 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
791 ("[p4,%d] illegal CPU %d", __LINE__, cpu));
792
793 KASSERT(ri >= 0 && ri < P4_NPMCS,
794 ("[p4,%d] illegal row-index %d", __LINE__, ri));
795
796 PMCDBG(MDP,CFG,1, "cpu=%d ri=%d pm=%p", cpu, ri, pm);
797
798 pc = p4_pcpu[P4_TO_HTT_PRIMARY(cpu)];
799 phw = &pc->pc_p4pmcs[ri];
800
801 KASSERT(pm == NULL || phw->phw_pmc == NULL ||
802 (p4_system_has_htt && phw->phw_pmc == pm),
803 ("[p4,%d] hwpmc not unconfigured before re-config", __LINE__));
804
805 mtx_lock_spin(&pc->pc_mtx);
806 cfgflags = P4_PCPU_GET_CFGFLAGS(pc,ri);
807
808 KASSERT(cfgflags >= 0 || cfgflags <= 3,
809 ("[p4,%d] illegal cfgflags cfg=%d on cpu=%d ri=%d", __LINE__,
810 cfgflags, cpu, ri));
811
812 KASSERT(cfgflags == 0 || phw->phw_pmc,
813 ("[p4,%d] cpu=%d ri=%d pmc configured with zero cfg count",
814 __LINE__, cpu, ri));
815
816 cpuflag = P4_CPU_TO_FLAG(cpu);
817
818 if (pm) { /* config */
819 if (cfgflags == 0)
820 phw->phw_pmc = pm;
821
822 KASSERT(phw->phw_pmc == pm,
823 ("[p4,%d] cpu=%d ri=%d config %p != hw %p",
824 __LINE__, cpu, ri, pm, phw->phw_pmc));
825
826 cfgflags |= cpuflag;
827 } else { /* unconfig */
828 cfgflags &= ~cpuflag;
829
830 if (cfgflags == 0)
831 phw->phw_pmc = NULL;
832 }
833
834 KASSERT(cfgflags >= 0 || cfgflags <= 3,
835 ("[p4,%d] illegal runcount cfg=%d on cpu=%d ri=%d", __LINE__,
836 cfgflags, cpu, ri));
837
838 P4_PCPU_SET_CFGFLAGS(pc,ri,cfgflags);
839
840 mtx_unlock_spin(&pc->pc_mtx);
841
842 return (0);
843}
844
845/*
846 * Retrieve a configured PMC pointer from hardware state.
847 */
848
849static int
850p4_get_config(int cpu, int ri, struct pmc **ppm)
851{
852 int cfgflags;
853 struct p4_cpu *pc;
854
855 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
856 ("[p4,%d] illegal CPU %d", __LINE__, cpu));
857 KASSERT(ri >= 0 && ri < P4_NPMCS,
858 ("[p4,%d] illegal row-index %d", __LINE__, ri));
859
860 pc = p4_pcpu[P4_TO_HTT_PRIMARY(cpu)];
861
862 mtx_lock_spin(&pc->pc_mtx);
863 cfgflags = P4_PCPU_GET_CFGFLAGS(pc,ri);
864 mtx_unlock_spin(&pc->pc_mtx);
865
866 if (cfgflags & P4_CPU_TO_FLAG(cpu))
867 *ppm = pc->pc_p4pmcs[ri].phw_pmc; /* PMC config'ed on this CPU */
868 else
869 *ppm = NULL;
870
871 return 0;
872}
873
874/*
875 * Allocate a PMC.
876 *
877 * The allocation strategy differs between HTT and non-HTT systems.
878 *
879 * The non-HTT case:
880 * - Given the desired event and the PMC row-index, lookup the
881 * list of valid ESCRs for the event.
882 * - For each valid ESCR:
883 * - Check if the ESCR is free and the ESCR row is in a compatible
884 * mode (i.e., system or process))
885 * - Check if the ESCR is usable with a P4 PMC at the desired row-index.
886 * If everything matches, we determine the appropriate bit values for the
887 * ESCR and CCCR registers.
888 *
889 * The HTT case:
890 *
891 * - Process mode PMCs require special care. The FreeBSD scheduler could
892 * schedule any two processes on the same physical CPU. We need to ensure
893 * that a given PMC row-index is never allocated to two different
894 * PMCs owned by different user-processes.
895 * This is ensured by always allocating a PMC from a 'FREE' PMC row
896 * if the system has HTT active.
897 * - A similar check needs to be done for ESCRs; we do not want two PMCs
898 * using the same ESCR to be scheduled at the same time. Thus ESCR
899 * allocation is also restricted to FREE rows if the system has HTT
900 * enabled.
901 * - Thirdly, some events are 'thread-independent' terminology, i.e.,
902 * the PMC hardware cannot distinguish between events caused by
903 * different logical CPUs. This makes it impossible to assign events
904 * to a given thread of execution. If the system has HTT enabled,
905 * these events are not allowed for process-mode PMCs.
906 */
907
908static int
909p4_allocate_pmc(int cpu, int ri, struct pmc *pm,
910 const struct pmc_op_pmcallocate *a)
911{
912 int found, n, m;
913 uint32_t caps, cccrvalue, escrvalue, tflags;
914 enum pmc_p4escr escr;
915 struct p4_cpu *pc;
916 struct p4_event_descr *pevent;
917 const struct p4pmc_descr *pd;
918
919 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
920 ("[p4,%d] illegal CPU %d", __LINE__, cpu));
921 KASSERT(ri >= 0 && ri < P4_NPMCS,
922 ("[p4,%d] illegal row-index value %d", __LINE__, ri));
923
924 pd = &p4_pmcdesc[ri];
925
926 PMCDBG(MDP,ALL,1, "p4-allocate ri=%d class=%d pmccaps=0x%x "
927 "reqcaps=0x%x", ri, pd->pm_descr.pd_class, pd->pm_descr.pd_caps,
928 pm->pm_caps);
929
930 /* check class */
931 if (pd->pm_descr.pd_class != a->pm_class)
932 return (EINVAL);
933
934 /* check requested capabilities */
935 caps = a->pm_caps;
936 if ((pd->pm_descr.pd_caps & caps) != caps)
937 return (EPERM);
938
939 /*
940 * If the system has HTT enabled, and the desired allocation
941 * mode is process-private, and the PMC row disposition is not
942 * FREE (0), decline the allocation.
943 */
944
945 if (p4_system_has_htt &&
946 PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)) &&
947 pmc_getrowdisp(ri) != 0)
948 return (EBUSY);
949
950 KASSERT(pd->pm_descr.pd_class == PMC_CLASS_P4,
951 ("[p4,%d] unknown PMC class %d", __LINE__,
952 pd->pm_descr.pd_class));
953
954 if (pm->pm_event < PMC_EV_P4_FIRST ||
955 pm->pm_event > PMC_EV_P4_LAST)
956 return (EINVAL);
957
958 if ((pevent = p4_find_event(pm->pm_event)) == NULL)
959 return (ESRCH);
960
961 PMCDBG(MDP,ALL,2, "pevent={ev=%d,escrsel=0x%x,cccrsel=0x%x,isti=%d}",
962 pevent->pm_event, pevent->pm_escr_eventselect,
963 pevent->pm_cccr_select, pevent->pm_is_ti_event);
964
965 /*
966 * Some PMC events are 'thread independent'and therefore
967 * cannot be used for process-private modes if HTT is being
968 * used.
969 */
970
971 if (P4_EVENT_IS_TI(pevent) &&
972 PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)) &&
973 p4_system_has_htt)
974 return (EINVAL);
975
976 pc = p4_pcpu[P4_TO_HTT_PRIMARY(cpu)];
977
978 found = 0;
979
980 /* look for a suitable ESCR for this event */
981 for (n = 0; n < P4_MAX_ESCR_PER_EVENT && !found; n++) {
982 if ((escr = pevent->pm_escrs[n]) == P4_ESCR_NONE)
983 break; /* out of ESCRs */
984 /*
985 * Check ESCR row disposition.
986 *
987 * If the request is for a system-mode PMC, then the
988 * ESCR row should not be in process-virtual mode, and
989 * should also be free on the current CPU.
990 */
991
992 if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) {
993 if (P4_ESCR_ROW_DISP_IS_THREAD(escr) ||
994 pc->pc_escrs[escr] != P4_INVALID_PMC_INDEX)
995 continue;
996 }
997
998 /*
999 * If the request is for a process-virtual PMC, and if
1000 * HTT is not enabled, we can use an ESCR row that is
1001 * either FREE or already in process mode.
1002 *
1003 * If HTT is enabled, then we need to ensure that a
1004 * given ESCR is never allocated to two PMCS that
1005 * could run simultaneously on the two logical CPUs of
1006 * a CPU package. We ensure this be only allocating
1007 * ESCRs from rows marked as 'FREE'.
1008 */
1009
1010 if (PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) {
1011 if (p4_system_has_htt) {
1012 if (!P4_ESCR_ROW_DISP_IS_FREE(escr))
1013 continue;
1014 } else
1015 if (P4_ESCR_ROW_DISP_IS_STANDALONE(escr))
1016 continue;
1017 }
1018
1019 /*
1020 * We found a suitable ESCR for this event. Now check if
1021 * this escr can work with the PMC at row-index 'ri'.
1022 */
1023
1024 for (m = 0; m < P4_MAX_PMC_PER_ESCR; m++)
1025 if (p4_escrs[escr].pm_pmcs[m] == pd->pm_pmcnum) {
1026 found = 1;
1027 break;
1028 }
1029 }
1030
1031 if (found == 0)
1032 return (ESRCH);
1033
1034 KASSERT((int) escr >= 0 && escr < P4_NESCR,
1035 ("[p4,%d] illegal ESCR value %d", __LINE__, escr));
1036
1037 /* mark ESCR row mode */
1038 if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) {
1039 pc->pc_escrs[escr] = ri; /* mark ESCR as in use on this cpu */
1040 P4_ESCR_MARK_ROW_STANDALONE(escr);
1041 } else {
1042 KASSERT(pc->pc_escrs[escr] == P4_INVALID_PMC_INDEX,
1043 ("[p4,%d] escr[%d] already in use", __LINE__, escr));
1044 P4_ESCR_MARK_ROW_THREAD(escr);
1045 }
1046
1047 pm->pm_md.pm_p4.pm_p4_escrmsr = p4_escrs[escr].pm_escr_msr;
1048 pm->pm_md.pm_p4.pm_p4_escr = escr;
1049
1050 cccrvalue = P4_CCCR_TO_ESCR_SELECT(pevent->pm_cccr_select);
1051 escrvalue = P4_ESCR_TO_EVENT_SELECT(pevent->pm_escr_eventselect);
1052
1053 /* CCCR fields */
1054 if (caps & PMC_CAP_THRESHOLD)
1055 cccrvalue |= (a->pm_md.pm_p4.pm_p4_cccrconfig &
1056 P4_CCCR_THRESHOLD_MASK) | P4_CCCR_COMPARE;
1057
1058 if (caps & PMC_CAP_EDGE)
1059 cccrvalue |= P4_CCCR_EDGE;
1060
1061 if (caps & PMC_CAP_INVERT)
1062 cccrvalue |= P4_CCCR_COMPLEMENT;
1063
1064 if (p4_system_has_htt)
1065 cccrvalue |= a->pm_md.pm_p4.pm_p4_cccrconfig &
1066 P4_CCCR_ACTIVE_THREAD_MASK;
1067 else /* no HTT; thread field should be '11b' */
1068 cccrvalue |= P4_CCCR_TO_ACTIVE_THREAD(0x3);
1069
1070 if (caps & PMC_CAP_CASCADE)
1071 cccrvalue |= P4_CCCR_CASCADE;
1072
1073 /* On HTT systems the PMI T0 field may get moved to T1 at pmc start */
1074 if (caps & PMC_CAP_INTERRUPT)
1075 cccrvalue |= P4_CCCR_OVF_PMI_T0;
1076
1077 /* ESCR fields */
1078 if (caps & PMC_CAP_QUALIFIER)
1079 escrvalue |= a->pm_md.pm_p4.pm_p4_escrconfig &
1080 P4_ESCR_EVENT_MASK_MASK;
1081 if (caps & PMC_CAP_TAGGING)
1082 escrvalue |= (a->pm_md.pm_p4.pm_p4_escrconfig &
1083 P4_ESCR_TAG_VALUE_MASK) | P4_ESCR_TAG_ENABLE;
1084 if (caps & PMC_CAP_QUALIFIER)
1085 escrvalue |= (a->pm_md.pm_p4.pm_p4_escrconfig &
1086 P4_ESCR_EVENT_MASK_MASK);
1087
1088 /* HTT: T0_{OS,USR} bits may get moved to T1 at pmc start */
1089 tflags = 0;
1090 if (caps & PMC_CAP_SYSTEM)
1091 tflags |= P4_ESCR_T0_OS;
1092 if (caps & PMC_CAP_USER)
1093 tflags |= P4_ESCR_T0_USR;
1094 if (tflags == 0)
1095 tflags = (P4_ESCR_T0_OS|P4_ESCR_T0_USR);
1096 escrvalue |= tflags;
1097
1098 pm->pm_md.pm_p4.pm_p4_cccrvalue = cccrvalue;
1099 pm->pm_md.pm_p4.pm_p4_escrvalue = escrvalue;
1100
1101 PMCDBG(MDP,ALL,2, "p4-allocate cccrsel=0x%x cccrval=0x%x "
1102 "escr=%d escrmsr=0x%x escrval=0x%x", pevent->pm_cccr_select,
1103 cccrvalue, escr, pm->pm_md.pm_p4.pm_p4_escrmsr, escrvalue);
1104
1105 return (0);
1106}
1107
1108/*
1109 * release a PMC.
1110 */
1111
1112static int
1113p4_release_pmc(int cpu, int ri, struct pmc *pm)
1114{
1115 enum pmc_p4escr escr;
1116 struct p4_cpu *pc;
1117
1118 KASSERT(ri >= 0 && ri < P4_NPMCS,
1119 ("[p4,%d] illegal row-index %d", __LINE__, ri));
1120
1121 escr = pm->pm_md.pm_p4.pm_p4_escr;
1122
1123 PMCDBG(MDP,REL,1, "p4-release cpu=%d ri=%d escr=%d", cpu, ri, escr);
1124
1125 if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) {
1126 pc = p4_pcpu[P4_TO_HTT_PRIMARY(cpu)];
1127
1128 KASSERT(pc->pc_p4pmcs[ri].phw_pmc == NULL,
1129 ("[p4,%d] releasing configured PMC ri=%d", __LINE__, ri));
1130
1131 P4_ESCR_UNMARK_ROW_STANDALONE(escr);
1132 KASSERT(pc->pc_escrs[escr] == ri,
1133 ("[p4,%d] escr[%d] not allocated to ri %d", __LINE__,
1134 escr, ri));
1135 pc->pc_escrs[escr] = P4_INVALID_PMC_INDEX; /* mark as free */
1136 } else
1137 P4_ESCR_UNMARK_ROW_THREAD(escr);
1138
1139 return (0);
1140}
1141
1142/*
1143 * Start a PMC
1144 */
1145
1146static int
1147p4_start_pmc(int cpu, int ri)
1148{
1149 int rc;
1150 struct pmc *pm;
1151 struct p4_cpu *pc;
1152 struct p4pmc_descr *pd;
1153 uint32_t cccrvalue, cccrtbits, escrvalue, escrmsr, escrtbits;
1154
1155 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
1156 ("[p4,%d] illegal CPU value %d", __LINE__, cpu));
1157 KASSERT(ri >= 0 && ri < P4_NPMCS,
1158 ("[p4,%d] illegal row-index %d", __LINE__, ri));
1159
1160 pc = p4_pcpu[P4_TO_HTT_PRIMARY(cpu)];
1161 pm = pc->pc_p4pmcs[ri].phw_pmc;
1162 pd = &p4_pmcdesc[ri];
1163
1164 KASSERT(pm != NULL,
1165 ("[p4,%d] starting cpu%d,pmc%d with null pmc", __LINE__, cpu, ri));
1166
1167 PMCDBG(MDP,STA,1, "p4-start cpu=%d ri=%d", cpu, ri);
1168
1169 KASSERT(pd->pm_descr.pd_class == PMC_CLASS_P4,
1170 ("[p4,%d] wrong PMC class %d", __LINE__,
1171 pd->pm_descr.pd_class));
1172
1173 /* retrieve the desired CCCR/ESCR values from the PMC */
1174 cccrvalue = pm->pm_md.pm_p4.pm_p4_cccrvalue;
1175 escrvalue = pm->pm_md.pm_p4.pm_p4_escrvalue;
1176 escrmsr = pm->pm_md.pm_p4.pm_p4_escrmsr;
1177
1178 /* extract and zero the logical processor selection bits */
1179 cccrtbits = cccrvalue & P4_CCCR_OVF_PMI_T0;
1180 escrtbits = escrvalue & (P4_ESCR_T0_OS|P4_ESCR_T0_USR);
1181 cccrvalue &= ~P4_CCCR_OVF_PMI_T0;
1182 escrvalue &= ~(P4_ESCR_T0_OS|P4_ESCR_T0_USR);
1183
1184 if (P4_CPU_IS_HTT_SECONDARY(cpu)) { /* shift T0 bits to T1 position */
1185 cccrtbits <<= 1;
1186 escrtbits >>= 2;
1187 }
1188
1189 /* start system mode PMCs directly */
1190 if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) {
1191 wrmsr(escrmsr, escrvalue | escrtbits);
1192 wrmsr(pd->pm_cccr_msr, cccrvalue | cccrtbits | P4_CCCR_ENABLE);
1193 return 0;
1194 }
1195
1196 /*
1197 * Thread mode PMCs
1198 *
1199 * On HTT machines, the same PMC could be scheduled on the
1200 * same physical CPU twice (once for each logical CPU), for
1201 * example, if two threads of a multi-threaded process get
1202 * scheduled on the same CPU.
1203 *
1204 */
1205
1206 mtx_lock_spin(&pc->pc_mtx);
1207
1208 rc = P4_PCPU_GET_RUNCOUNT(pc,ri);
1209 KASSERT(rc == 0 || rc == 1,
1210 ("[p4,%d] illegal runcount cpu=%d ri=%d rc=%d", __LINE__, cpu, ri,
1211 rc));
1212
1213 if (rc == 0) { /* 1st CPU and the non-HTT case */
1214
1215 KASSERT(P4_PMC_IS_STOPPED(pd->pm_cccr_msr),
1216 ("[p4,%d] cpu=%d ri=%d cccr=0x%x not stopped", __LINE__,
1217 cpu, ri, pd->pm_cccr_msr));
1218
1219 /* write out the low 40 bits of the saved value to hardware */
1220 wrmsr(pd->pm_pmc_msr,
1221 P4_PCPU_PMC_VALUE(pc,ri,cpu) & P4_PERFCTR_MASK);
1222
1223 } else if (rc == 1) { /* 2nd CPU */
1224
1225 /*
1226 * Stop the PMC and retrieve the CCCR and ESCR values
1227 * from their MSRs, and turn on the additional T[0/1]
1228 * bits for the 2nd CPU.
1229 */
1230
1231 cccrvalue = rdmsr(pd->pm_cccr_msr);
1232 wrmsr(pd->pm_cccr_msr, cccrvalue & ~P4_CCCR_ENABLE);
1233
1234 /* check that the configuration bits read back match the PMC */
1235 KASSERT((cccrvalue & P4_CCCR_Tx_MASK) ==
1236 (pm->pm_md.pm_p4.pm_p4_cccrvalue & P4_CCCR_Tx_MASK),
1237 ("[p4,%d] Extra CCCR bits cpu=%d rc=%d ri=%d "
1238 "cccr=0x%x PMC=0x%x", __LINE__, cpu, rc, ri,
1239 cccrvalue & P4_CCCR_Tx_MASK,
1240 pm->pm_md.pm_p4.pm_p4_cccrvalue & P4_CCCR_Tx_MASK));
1241 KASSERT(cccrvalue & P4_CCCR_ENABLE,
1242 ("[p4,%d] 2nd cpu rc=%d cpu=%d ri=%d not running",
1243 __LINE__, rc, cpu, ri));
1244 KASSERT((cccrvalue & cccrtbits) == 0,
1245 ("[p4,%d] CCCR T0/T1 mismatch rc=%d cpu=%d ri=%d"
1246 "cccrvalue=0x%x tbits=0x%x", __LINE__, rc, cpu, ri,
1247 cccrvalue, cccrtbits));
1248
1249 escrvalue = rdmsr(escrmsr);
1250
1251 KASSERT((escrvalue & P4_ESCR_Tx_MASK) ==
1252 (pm->pm_md.pm_p4.pm_p4_escrvalue & P4_ESCR_Tx_MASK),
1253 ("[p4,%d] Extra ESCR bits cpu=%d rc=%d ri=%d "
1254 "escr=0x%x pm=0x%x", __LINE__, cpu, rc, ri,
1255 escrvalue & P4_ESCR_Tx_MASK,
1256 pm->pm_md.pm_p4.pm_p4_escrvalue & P4_ESCR_Tx_MASK));
1257 KASSERT((escrvalue & escrtbits) == 0,
1258 ("[p4,%d] ESCR T0/T1 mismatch rc=%d cpu=%d ri=%d "
1259 "escrmsr=0x%x escrvalue=0x%x tbits=0x%x", __LINE__,
1260 rc, cpu, ri, escrmsr, escrvalue, escrtbits));
1261 }
1262
1263 /* Enable the correct bits for this CPU. */
1264 escrvalue |= escrtbits;
1265 cccrvalue |= cccrtbits | P4_CCCR_ENABLE;
1266
1267 /* Save HW value at the time of starting hardware */
1268 P4_PCPU_HW_VALUE(pc,ri,cpu) = rdmsr(pd->pm_pmc_msr);
1269
1270 /* Program the ESCR and CCCR and start the PMC */
1271 wrmsr(escrmsr, escrvalue);
1272 wrmsr(pd->pm_cccr_msr, cccrvalue);
1273
1274 ++rc;
1275 P4_PCPU_SET_RUNCOUNT(pc,ri,rc);
1276
1277 mtx_unlock_spin(&pc->pc_mtx);
1278
1279 PMCDBG(MDP,STA,2,"p4-start cpu=%d rc=%d ri=%d escr=%d "
1280 "escrmsr=0x%x escrvalue=0x%x cccr_config=0x%x v=%jx", cpu, rc,
1281 ri, pm->pm_md.pm_p4.pm_p4_escr, escrmsr, escrvalue,
1282 cccrvalue, P4_PCPU_HW_VALUE(pc,ri,cpu));
1283
1284 return (0);
1285}
1286
1287/*
1288 * Stop a PMC.
1289 */
1290
1291static int
1292p4_stop_pmc(int cpu, int ri)
1293{
1294 int rc;
1295 uint32_t cccrvalue, cccrtbits, escrvalue, escrmsr, escrtbits;
1296 struct pmc *pm;
1297 struct p4_cpu *pc;
1298 struct p4pmc_descr *pd;
1299 pmc_value_t tmp;
1300
1301 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
1302 ("[p4,%d] illegal CPU value %d", __LINE__, cpu));
1303 KASSERT(ri >= 0 && ri < P4_NPMCS,
1304 ("[p4,%d] illegal row index %d", __LINE__, ri));
1305
1306 pd = &p4_pmcdesc[ri];
1307 pc = p4_pcpu[P4_TO_HTT_PRIMARY(cpu)];
1308 pm = pc->pc_p4pmcs[ri].phw_pmc;
1309
1310 KASSERT(pm != NULL,
1311 ("[p4,%d] null pmc for cpu%d, ri%d", __LINE__, cpu, ri));
1312
1313 PMCDBG(MDP,STO,1, "p4-stop cpu=%d ri=%d", cpu, ri);
1314
1315 if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) {
1316 wrmsr(pd->pm_cccr_msr,
1317 pm->pm_md.pm_p4.pm_p4_cccrvalue & ~P4_CCCR_ENABLE);
1318 return (0);
1319 }
1320
1321 /*
1322 * Thread mode PMCs.
1323 *
1324 * On HTT machines, this PMC may be in use by two threads
1325 * running on two logical CPUS. Thus we look at the
1326 * 'runcount' field and only turn off the appropriate TO/T1
1327 * bits (and keep the PMC running) if two logical CPUs were
1328 * using the PMC.
1329 *
1330 */
1331
1332 /* bits to mask */
1333 cccrtbits = P4_CCCR_OVF_PMI_T0;
1334 escrtbits = P4_ESCR_T0_OS | P4_ESCR_T0_USR;
1335 if (P4_CPU_IS_HTT_SECONDARY(cpu)) {
1336 cccrtbits <<= 1;
1337 escrtbits >>= 2;
1338 }
1339
1340 mtx_lock_spin(&pc->pc_mtx);
1341
1342 rc = P4_PCPU_GET_RUNCOUNT(pc,ri);
1343
1344 KASSERT(rc == 2 || rc == 1,
1345 ("[p4,%d] illegal runcount cpu=%d ri=%d rc=%d", __LINE__, cpu, ri,
1346 rc));
1347
1348 --rc;
1349
1350 P4_PCPU_SET_RUNCOUNT(pc,ri,rc);
1351
1352 /* Stop this PMC */
1353 cccrvalue = rdmsr(pd->pm_cccr_msr);
1354 wrmsr(pd->pm_cccr_msr, cccrvalue & ~P4_CCCR_ENABLE);
1355
1356 escrmsr = pm->pm_md.pm_p4.pm_p4_escrmsr;
1357 escrvalue = rdmsr(escrmsr);
1358
1359 /* The current CPU should be running on this PMC */
1360 KASSERT(escrvalue & escrtbits,
1361 ("[p4,%d] ESCR T0/T1 mismatch cpu=%d rc=%d ri=%d escrmsr=0x%x "
1362 "escrvalue=0x%x tbits=0x%x", __LINE__, cpu, rc, ri, escrmsr,
1363 escrvalue, escrtbits));
1364 KASSERT(PMC_IS_COUNTING_MODE(PMC_TO_MODE(pm)) ||
1365 (cccrvalue & cccrtbits),
1366 ("[p4,%d] CCCR T0/T1 mismatch cpu=%d ri=%d cccrvalue=0x%x "
1367 "tbits=0x%x", __LINE__, cpu, ri, cccrvalue, cccrtbits));
1368
1369 /* get the current hardware reading */
1370 tmp = rdmsr(pd->pm_pmc_msr);
1371
1372 if (rc == 1) { /* need to keep the PMC running */
1373 escrvalue &= ~escrtbits;
1374 cccrvalue &= ~cccrtbits;
1375 wrmsr(escrmsr, escrvalue);
1376 wrmsr(pd->pm_cccr_msr, cccrvalue);
1377 }
1378
1379 mtx_unlock_spin(&pc->pc_mtx);
1380
1381 PMCDBG(MDP,STO,2, "p4-stop cpu=%d rc=%d ri=%d escrmsr=0x%x "
1382 "escrval=0x%x cccrval=0x%x v=%jx", cpu, rc, ri, escrmsr,
1383 escrvalue, cccrvalue, tmp);
1384
1385 if (tmp < P4_PCPU_HW_VALUE(pc,ri,cpu)) /* 40 bit counter overflow */
1386 tmp += (P4_PERFCTR_MASK + 1) - P4_PCPU_HW_VALUE(pc,ri,cpu);
1387 else
1388 tmp -= P4_PCPU_HW_VALUE(pc,ri,cpu);
1389
1390 P4_PCPU_PMC_VALUE(pc,ri,cpu) += tmp;
1391
1392 return 0;
1393}
1394
1395/*
1396 * Handle an interrupt.
1397 *
1398 * The hardware sets the CCCR_OVF whenever a counter overflow occurs,
1399 * so the handler examines all the 18 CCCR registers, processing the
1400 * counters that have overflowed.
1401 *
1402 * On HTT machines, the CCCR register is shared and will interrupt
1403 * both logical processors if so configured. Thus multiple logical
1404 * CPUs could enter the NMI service routine at the same time. These
1405 * will get serialized using a per-cpu spinlock dedicated for use in
1406 * the NMI handler.
1407 */
1408
1409static int
1410p4_intr(int cpu, struct trapframe *tf)
1411{
1412 uint32_t cccrval, ovf_mask, ovf_partner;
1413 int did_interrupt, error, ri;
1414 struct p4_cpu *pc;
1415 struct pmc *pm;
1416 pmc_value_t v;
1417
1418 PMCDBG(MDP,INT, 1, "cpu=%d tf=0x%p um=%d", cpu, (void *) tf,
1419 TRAPF_USERMODE(tf));
1420
1421 pc = p4_pcpu[P4_TO_HTT_PRIMARY(cpu)];
1422
1423 ovf_mask = P4_CPU_IS_HTT_SECONDARY(cpu) ?
1424 P4_CCCR_OVF_PMI_T1 : P4_CCCR_OVF_PMI_T0;
1425 ovf_mask |= P4_CCCR_OVF;
1426 if (p4_system_has_htt)
1427 ovf_partner = P4_CPU_IS_HTT_SECONDARY(cpu) ?
1428 P4_CCCR_OVF_PMI_T0 : P4_CCCR_OVF_PMI_T1;
1429 else
1430 ovf_partner = 0;
1431 did_interrupt = 0;
1432
1433 if (p4_system_has_htt)
1434 P4_PCPU_ACQ_INTR_SPINLOCK(pc);
1435
1436 /*
1437 * Loop through all CCCRs, looking for ones that have
1438 * interrupted this CPU.
1439 */
1440 for (ri = 0; ri < P4_NPMCS; ri++) {
1441
1442 /*
1443 * Check if our partner logical CPU has already marked
1444 * this PMC has having interrupted it. If so, reset
1445 * the flag and process the interrupt, but leave the
1446 * hardware alone.
1447 */
1448 if (p4_system_has_htt && P4_PCPU_GET_INTRFLAG(pc,ri)) {
1449 P4_PCPU_SET_INTRFLAG(pc,ri,0);
1450 did_interrupt = 1;
1451
1452 /*
1453 * Ignore de-configured or stopped PMCs.
1454 * Ignore PMCs not in sampling mode.
1455 */
1456 pm = pc->pc_p4pmcs[ri].phw_pmc;
1457 if (pm == NULL ||
1458 pm->pm_state != PMC_STATE_RUNNING ||
1459 !PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) {
1460 continue;
1461 }
1462 (void) pmc_process_interrupt(cpu, pm, tf,
1463 TRAPF_USERMODE(tf));
1464 continue;
1465 }
1466
1467 /*
1468 * Fresh interrupt. Look for the CCCR_OVF bit
1469 * and the OVF_Tx bit for this logical
1470 * processor being set.
1471 */
1472 cccrval = rdmsr(P4_CCCR_MSR_FIRST + ri);
1473
1474 if ((cccrval & ovf_mask) != ovf_mask)
1475 continue;
1476
1477 /*
1478 * If the other logical CPU would also have been
1479 * interrupted due to the PMC being shared, record
1480 * this fact in the per-cpu saved interrupt flag
1481 * bitmask.
1482 */
1483 if (p4_system_has_htt && (cccrval & ovf_partner))
1484 P4_PCPU_SET_INTRFLAG(pc, ri, 1);
1485
1486 v = rdmsr(P4_PERFCTR_MSR_FIRST + ri);
1487
1488 PMCDBG(MDP,INT, 2, "ri=%d v=%jx", ri, v);
1489
1490 /* Stop the counter, and reset the overflow bit */
1491 cccrval &= ~(P4_CCCR_OVF | P4_CCCR_ENABLE);
1492 wrmsr(P4_CCCR_MSR_FIRST + ri, cccrval);
1493
1494 did_interrupt = 1;
1495
1496 /*
1497 * Ignore de-configured or stopped PMCs. Ignore PMCs
1498 * not in sampling mode.
1499 */
1500 pm = pc->pc_p4pmcs[ri].phw_pmc;
1501
1502 if (pm == NULL ||
1503 pm->pm_state != PMC_STATE_RUNNING ||
1504 !PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) {
1505 continue;
1506 }
1507
1508 /*
1509 * Process the interrupt. Re-enable the PMC if
1510 * processing was successful.
1511 */
1512 error = pmc_process_interrupt(cpu, pm, tf,
1513 TRAPF_USERMODE(tf));
1514
1515 /*
1516 * Only the first processor executing the NMI handler
1517 * in a HTT pair will restart a PMC, and that too
1518 * only if there were no errors.
1519 */
1520 v = P4_RELOAD_COUNT_TO_PERFCTR_VALUE(
1521 pm->pm_sc.pm_reloadcount);
1522 wrmsr(P4_PERFCTR_MSR_FIRST + ri, v);
1523 if (error == 0)
1524 wrmsr(P4_CCCR_MSR_FIRST + ri,
1525 cccrval | P4_CCCR_ENABLE);
1526 }
1527
1528 /* allow the other CPU to proceed */
1529 if (p4_system_has_htt)
1530 P4_PCPU_REL_INTR_SPINLOCK(pc);
1531
1532 /*
1533 * On Intel P4 CPUs, the PMC 'pcint' entry in the LAPIC gets
1534 * masked when a PMC interrupts the CPU. We need to unmask
1535 * the interrupt source explicitly.
1536 */
1537
1538 if (did_interrupt)
1539 pmc_x86_lapic_enable_pmc_interrupt();
1540
1541 atomic_add_int(did_interrupt ? &pmc_stats.pm_intr_processed :
1542 &pmc_stats.pm_intr_ignored, 1);
1543
1544 return (did_interrupt);
1545}
1546
1547/*
1548 * Describe a CPU's PMC state.
1549 */
1550
1551static int
1552p4_describe(int cpu, int ri, struct pmc_info *pi,
1553 struct pmc **ppmc)
1554{
1555 int error;
1556 size_t copied;
1557 const struct p4pmc_descr *pd;
1558
1559 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
1560 ("[p4,%d] illegal CPU %d", __LINE__, cpu));
1561 KASSERT(ri >= 0 && ri < P4_NPMCS,
1562 ("[p4,%d] row-index %d out of range", __LINE__, ri));
1563
1564 PMCDBG(MDP,OPS,1,"p4-describe cpu=%d ri=%d", cpu, ri);
1565
1566 if (P4_CPU_IS_HTT_SECONDARY(cpu))
1567 return (EINVAL);
1568
1569 pd = &p4_pmcdesc[ri];
1570
1571 if ((error = copystr(pd->pm_descr.pd_name, pi->pm_name,
1572 PMC_NAME_MAX, &copied)) != 0)
1573 return (error);
1574
1575 pi->pm_class = pd->pm_descr.pd_class;
1576
1577 if (p4_pcpu[cpu]->pc_p4pmcs[ri].phw_state & PMC_PHW_FLAG_IS_ENABLED) {
1578 pi->pm_enabled = TRUE;
1579 *ppmc = p4_pcpu[cpu]->pc_p4pmcs[ri].phw_pmc;
1580 } else {
1581 pi->pm_enabled = FALSE;
1582 *ppmc = NULL;
1583 }
1584
1585 return (0);
1586}
1587
1588/*
1589 * Get MSR# for use with RDPMC.
1590 */
1591
1592static int
1593p4_get_msr(int ri, uint32_t *msr)
1594{
1595 KASSERT(ri >= 0 && ri < P4_NPMCS,
1596 ("[p4,%d] ri %d out of range", __LINE__, ri));
1597
1598 *msr = p4_pmcdesc[ri].pm_pmc_msr - P4_PERFCTR_MSR_FIRST;
1599
1600 PMCDBG(MDP,OPS, 1, "ri=%d getmsr=0x%x", ri, *msr);
1601
1602 return 0;
1603}
1604
1605
1606int
1607pmc_p4_initialize(struct pmc_mdep *md, int ncpus)
1608{
1609 struct pmc_classdep *pcd;
1610 struct p4_event_descr *pe;
1611
1612 KASSERT(md != NULL, ("[p4,%d] md is NULL", __LINE__));
| 45#include <machine/md_var.h>
46#include <machine/specialreg.h>
47
48/*
49 * PENTIUM 4 SUPPORT
50 *
51 * The P4 has 18 PMCs, divided into 4 groups with 4,4,4 and 6 PMCs
52 * respectively. Each PMC comprises of two model specific registers:
53 * a counter configuration control register (CCCR) and a counter
54 * register that holds the actual event counts.
55 *
56 * Configuring an event requires the use of one of 45 event selection
57 * control registers (ESCR). Events are associated with specific
58 * ESCRs. Each PMC group has a set of ESCRs it can use.
59 *
60 * - The BPU counter group (4 PMCs) can use the 16 ESCRs:
61 * BPU_ESCR{0,1}, IS_ESCR{0,1}, MOB_ESCR{0,1}, ITLB_ESCR{0,1},
62 * PMH_ESCR{0,1}, IX_ESCR{0,1}, FSB_ESCR{0,}, BSU_ESCR{0,1}.
63 *
64 * - The MS counter group (4 PMCs) can use the 6 ESCRs: MS_ESCR{0,1},
65 * TC_ESCR{0,1}, TBPU_ESCR{0,1}.
66 *
67 * - The FLAME counter group (4 PMCs) can use the 10 ESCRs:
68 * FLAME_ESCR{0,1}, FIRM_ESCR{0,1}, SAAT_ESCR{0,1}, U2L_ESCR{0,1},
69 * DAC_ESCR{0,1}.
70 *
71 * - The IQ counter group (6 PMCs) can use the 13 ESCRs: IQ_ESCR{0,1},
72 * ALF_ESCR{0,1}, RAT_ESCR{0,1}, SSU_ESCR0, CRU_ESCR{0,1,2,3,4,5}.
73 *
74 * Even-numbered ESCRs can be used with counters 0, 1 and 4 (if
75 * present) of a counter group. Odd-numbers ESCRs can be used with
76 * counters 2, 3 and 5 (if present) of a counter group. The
77 * 'p4_escrs[]' table describes these restrictions in a form that
78 * function 'p4_allocate()' uses for making allocation decisions.
79 *
80 * SYSTEM-MODE AND THREAD-MODE ALLOCATION
81 *
82 * In addition to remembering the state of PMC rows
83 * ('FREE','STANDALONE', or 'THREAD'), we similar need to track the
84 * state of ESCR rows. If an ESCR is allocated to a system-mode PMC
85 * on a CPU we cannot allocate this to a thread-mode PMC. On a
86 * multi-cpu (multiple physical CPUs) system, ESCR allocation on each
87 * CPU is tracked by the pc_escrs[] array.
88 *
89 * Each system-mode PMC that is using an ESCR records its row-index in
90 * the appropriate entry and system-mode allocation attempts check
91 * that an ESCR is available using this array. Process-mode PMCs do
92 * not use the pc_escrs[] array, since ESCR row itself would have been
93 * marked as in 'THREAD' mode.
94 *
95 * HYPERTHREADING SUPPORT
96 *
97 * When HTT is enabled, the FreeBSD kernel treats the two 'logical'
98 * cpus as independent CPUs and can schedule kernel threads on them
99 * independently. However, the two logical CPUs share the same set of
100 * PMC resources. We need to ensure that:
101 * - PMCs that use the PMC_F_DESCENDANTS semantics are handled correctly,
102 * and,
103 * - Threads of multi-threaded processes that get scheduled on the same
104 * physical CPU are handled correctly.
105 *
106 * HTT Detection
107 *
108 * Not all HTT capable systems will have HTT enabled. We detect the
109 * presence of HTT by detecting if 'p4_init()' was called for a secondary
110 * CPU in a HTT pair.
111 *
112 * Note that hwpmc(4) cannot currently deal with a change in HTT status once
113 * loaded.
114 *
115 * Handling HTT READ / WRITE / START / STOP
116 *
117 * PMC resources are shared across the CPUs in an HTT pair. We
118 * designate the lower numbered CPU in a HTT pair as the 'primary'
119 * CPU. In each primary CPU's state we keep track of a 'runcount'
120 * which reflects the number of PMC-using processes that have been
121 * scheduled on its secondary CPU. Process-mode PMC operations will
122 * actually 'start' or 'stop' hardware only if these are the first or
123 * last processes respectively to use the hardware. PMC values
124 * written by a 'write' operation are saved and are transferred to
125 * hardware at PMC 'start' time if the runcount is 0. If the runcount
126 * is greater than 0 at the time of a 'start' operation, we keep track
127 * of the actual hardware value at the time of the 'start' operation
128 * and use this to adjust the final readings at PMC 'stop' or 'read'
129 * time.
130 *
131 * Execution sequences:
132 *
133 * Case 1: CPUx +...- (no overlap)
134 * CPUy +...-
135 * RC 0 1 0 1 0
136 *
137 * Case 2: CPUx +........- (partial overlap)
138 * CPUy +........-
139 * RC 0 1 2 1 0
140 *
141 * Case 3: CPUx +..............- (fully overlapped)
142 * CPUy +.....-
143 * RC 0 1 2 1 0
144 *
145 * Key:
146 * 'CPU[xy]' : one of the two logical processors on a HTT CPU.
147 * 'RC' : run count (#threads per physical core).
148 * '+' : point in time when a thread is put on a CPU.
149 * '-' : point in time where a thread is taken off a CPU.
150 *
151 * Handling HTT CONFIG
152 *
153 * Different processes attached to the same PMC may get scheduled on
154 * the two logical processors in the package. We keep track of config
155 * and de-config operations using the CFGFLAGS fields of the per-physical
156 * cpu state.
157 */
158
159#define P4_PMCS() \
160 P4_PMC(BPU_COUNTER0) \
161 P4_PMC(BPU_COUNTER1) \
162 P4_PMC(BPU_COUNTER2) \
163 P4_PMC(BPU_COUNTER3) \
164 P4_PMC(MS_COUNTER0) \
165 P4_PMC(MS_COUNTER1) \
166 P4_PMC(MS_COUNTER2) \
167 P4_PMC(MS_COUNTER3) \
168 P4_PMC(FLAME_COUNTER0) \
169 P4_PMC(FLAME_COUNTER1) \
170 P4_PMC(FLAME_COUNTER2) \
171 P4_PMC(FLAME_COUNTER3) \
172 P4_PMC(IQ_COUNTER0) \
173 P4_PMC(IQ_COUNTER1) \
174 P4_PMC(IQ_COUNTER2) \
175 P4_PMC(IQ_COUNTER3) \
176 P4_PMC(IQ_COUNTER4) \
177 P4_PMC(IQ_COUNTER5) \
178 P4_PMC(NONE)
179
180enum pmc_p4pmc {
181#undef P4_PMC
182#define P4_PMC(N) P4_PMC_##N ,
183 P4_PMCS()
184};
185
186/*
187 * P4 ESCR descriptors
188 */
189
190#define P4_ESCRS() \
191 P4_ESCR(BSU_ESCR0, 0x3A0, BPU_COUNTER0, BPU_COUNTER1, NONE) \
192 P4_ESCR(BSU_ESCR1, 0x3A1, BPU_COUNTER2, BPU_COUNTER3, NONE) \
193 P4_ESCR(FSB_ESCR0, 0x3A2, BPU_COUNTER0, BPU_COUNTER1, NONE) \
194 P4_ESCR(FSB_ESCR1, 0x3A3, BPU_COUNTER2, BPU_COUNTER3, NONE) \
195 P4_ESCR(FIRM_ESCR0, 0x3A4, FLAME_COUNTER0, FLAME_COUNTER1, NONE) \
196 P4_ESCR(FIRM_ESCR1, 0x3A5, FLAME_COUNTER2, FLAME_COUNTER3, NONE) \
197 P4_ESCR(FLAME_ESCR0, 0x3A6, FLAME_COUNTER0, FLAME_COUNTER1, NONE) \
198 P4_ESCR(FLAME_ESCR1, 0x3A7, FLAME_COUNTER2, FLAME_COUNTER3, NONE) \
199 P4_ESCR(DAC_ESCR0, 0x3A8, FLAME_COUNTER0, FLAME_COUNTER1, NONE) \
200 P4_ESCR(DAC_ESCR1, 0x3A9, FLAME_COUNTER2, FLAME_COUNTER3, NONE) \
201 P4_ESCR(MOB_ESCR0, 0x3AA, BPU_COUNTER0, BPU_COUNTER1, NONE) \
202 P4_ESCR(MOB_ESCR1, 0x3AB, BPU_COUNTER2, BPU_COUNTER3, NONE) \
203 P4_ESCR(PMH_ESCR0, 0x3AC, BPU_COUNTER0, BPU_COUNTER1, NONE) \
204 P4_ESCR(PMH_ESCR1, 0x3AD, BPU_COUNTER2, BPU_COUNTER3, NONE) \
205 P4_ESCR(SAAT_ESCR0, 0x3AE, FLAME_COUNTER0, FLAME_COUNTER1, NONE) \
206 P4_ESCR(SAAT_ESCR1, 0x3AF, FLAME_COUNTER2, FLAME_COUNTER3, NONE) \
207 P4_ESCR(U2L_ESCR0, 0x3B0, FLAME_COUNTER0, FLAME_COUNTER1, NONE) \
208 P4_ESCR(U2L_ESCR1, 0x3B1, FLAME_COUNTER2, FLAME_COUNTER3, NONE) \
209 P4_ESCR(BPU_ESCR0, 0x3B2, BPU_COUNTER0, BPU_COUNTER1, NONE) \
210 P4_ESCR(BPU_ESCR1, 0x3B3, BPU_COUNTER2, BPU_COUNTER3, NONE) \
211 P4_ESCR(IS_ESCR0, 0x3B4, BPU_COUNTER0, BPU_COUNTER1, NONE) \
212 P4_ESCR(IS_ESCR1, 0x3B5, BPU_COUNTER2, BPU_COUNTER3, NONE) \
213 P4_ESCR(ITLB_ESCR0, 0x3B6, BPU_COUNTER0, BPU_COUNTER1, NONE) \
214 P4_ESCR(ITLB_ESCR1, 0x3B7, BPU_COUNTER2, BPU_COUNTER3, NONE) \
215 P4_ESCR(CRU_ESCR0, 0x3B8, IQ_COUNTER0, IQ_COUNTER1, IQ_COUNTER4) \
216 P4_ESCR(CRU_ESCR1, 0x3B9, IQ_COUNTER2, IQ_COUNTER3, IQ_COUNTER5) \
217 P4_ESCR(IQ_ESCR0, 0x3BA, IQ_COUNTER0, IQ_COUNTER1, IQ_COUNTER4) \
218 P4_ESCR(IQ_ESCR1, 0x3BB, IQ_COUNTER1, IQ_COUNTER3, IQ_COUNTER5) \
219 P4_ESCR(RAT_ESCR0, 0x3BC, IQ_COUNTER0, IQ_COUNTER1, IQ_COUNTER4) \
220 P4_ESCR(RAT_ESCR1, 0x3BD, IQ_COUNTER2, IQ_COUNTER3, IQ_COUNTER5) \
221 P4_ESCR(SSU_ESCR0, 0x3BE, IQ_COUNTER0, IQ_COUNTER2, IQ_COUNTER4) \
222 P4_ESCR(MS_ESCR0, 0x3C0, MS_COUNTER0, MS_COUNTER1, NONE) \
223 P4_ESCR(MS_ESCR1, 0x3C1, MS_COUNTER2, MS_COUNTER3, NONE) \
224 P4_ESCR(TBPU_ESCR0, 0x3C2, MS_COUNTER0, MS_COUNTER1, NONE) \
225 P4_ESCR(TBPU_ESCR1, 0x3C3, MS_COUNTER2, MS_COUNTER3, NONE) \
226 P4_ESCR(TC_ESCR0, 0x3C4, MS_COUNTER0, MS_COUNTER1, NONE) \
227 P4_ESCR(TC_ESCR1, 0x3C5, MS_COUNTER2, MS_COUNTER3, NONE) \
228 P4_ESCR(IX_ESCR0, 0x3C8, BPU_COUNTER0, BPU_COUNTER1, NONE) \
229 P4_ESCR(IX_ESCR1, 0x3C9, BPU_COUNTER2, BPU_COUNTER3, NONE) \
230 P4_ESCR(ALF_ESCR0, 0x3CA, IQ_COUNTER0, IQ_COUNTER1, IQ_COUNTER4) \
231 P4_ESCR(ALF_ESCR1, 0x3CB, IQ_COUNTER2, IQ_COUNTER3, IQ_COUNTER5) \
232 P4_ESCR(CRU_ESCR2, 0x3CC, IQ_COUNTER0, IQ_COUNTER1, IQ_COUNTER4) \
233 P4_ESCR(CRU_ESCR3, 0x3CD, IQ_COUNTER2, IQ_COUNTER3, IQ_COUNTER5) \
234 P4_ESCR(CRU_ESCR4, 0x3E0, IQ_COUNTER0, IQ_COUNTER1, IQ_COUNTER4) \
235 P4_ESCR(CRU_ESCR5, 0x3E1, IQ_COUNTER2, IQ_COUNTER3, IQ_COUNTER5) \
236 P4_ESCR(NONE, ~0, NONE, NONE, NONE)
237
238enum pmc_p4escr {
239#define P4_ESCR(N, MSR, P1, P2, P3) P4_ESCR_##N ,
240 P4_ESCRS()
241#undef P4_ESCR
242};
243
244struct pmc_p4escr_descr {
245 const char pm_escrname[PMC_NAME_MAX];
246 u_short pm_escr_msr;
247 const enum pmc_p4pmc pm_pmcs[P4_MAX_PMC_PER_ESCR];
248};
249
250static struct pmc_p4escr_descr p4_escrs[] =
251{
252#define P4_ESCR(N, MSR, P1, P2, P3) \
253 { \
254 .pm_escrname = #N, \
255 .pm_escr_msr = (MSR), \
256 .pm_pmcs = \
257 { \
258 P4_PMC_##P1, \
259 P4_PMC_##P2, \
260 P4_PMC_##P3 \
261 } \
262 } ,
263
264 P4_ESCRS()
265
266#undef P4_ESCR
267};
268
269/*
270 * P4 Event descriptor
271 */
272
273struct p4_event_descr {
274 const enum pmc_event pm_event;
275 const uint32_t pm_escr_eventselect;
276 const uint32_t pm_cccr_select;
277 const char pm_is_ti_event;
278 enum pmc_p4escr pm_escrs[P4_MAX_ESCR_PER_EVENT];
279};
280
281static struct p4_event_descr p4_events[] = {
282
283#define P4_EVDESCR(NAME, ESCREVENTSEL, CCCRSEL, TI_EVENT, ESCR0, ESCR1) \
284 { \
285 .pm_event = PMC_EV_P4_##NAME, \
286 .pm_escr_eventselect = (ESCREVENTSEL), \
287 .pm_cccr_select = (CCCRSEL), \
288 .pm_is_ti_event = (TI_EVENT), \
289 .pm_escrs = \
290 { \
291 P4_ESCR_##ESCR0, \
292 P4_ESCR_##ESCR1 \
293 } \
294 }
295
296P4_EVDESCR(TC_DELIVER_MODE, 0x01, 0x01, TRUE, TC_ESCR0, TC_ESCR1),
297P4_EVDESCR(BPU_FETCH_REQUEST, 0x03, 0x00, FALSE, BPU_ESCR0, BPU_ESCR1),
298P4_EVDESCR(ITLB_REFERENCE, 0x18, 0x03, FALSE, ITLB_ESCR0, ITLB_ESCR1),
299P4_EVDESCR(MEMORY_CANCEL, 0x02, 0x05, FALSE, DAC_ESCR0, DAC_ESCR1),
300P4_EVDESCR(MEMORY_COMPLETE, 0x08, 0x02, FALSE, SAAT_ESCR0, SAAT_ESCR1),
301P4_EVDESCR(LOAD_PORT_REPLAY, 0x04, 0x02, FALSE, SAAT_ESCR0, SAAT_ESCR1),
302P4_EVDESCR(STORE_PORT_REPLAY, 0x05, 0x02, FALSE, SAAT_ESCR0, SAAT_ESCR1),
303P4_EVDESCR(MOB_LOAD_REPLAY, 0x03, 0x02, FALSE, MOB_ESCR0, MOB_ESCR1),
304P4_EVDESCR(PAGE_WALK_TYPE, 0x01, 0x04, TRUE, PMH_ESCR0, PMH_ESCR1),
305P4_EVDESCR(BSQ_CACHE_REFERENCE, 0x0C, 0x07, FALSE, BSU_ESCR0, BSU_ESCR1),
306P4_EVDESCR(IOQ_ALLOCATION, 0x03, 0x06, FALSE, FSB_ESCR0, FSB_ESCR1),
307P4_EVDESCR(IOQ_ACTIVE_ENTRIES, 0x1A, 0x06, FALSE, FSB_ESCR1, NONE),
308P4_EVDESCR(FSB_DATA_ACTIVITY, 0x17, 0x06, TRUE, FSB_ESCR0, FSB_ESCR1),
309P4_EVDESCR(BSQ_ALLOCATION, 0x05, 0x07, FALSE, BSU_ESCR0, NONE),
310P4_EVDESCR(BSQ_ACTIVE_ENTRIES, 0x06, 0x07, FALSE, BSU_ESCR1, NONE),
311 /* BSQ_ACTIVE_ENTRIES inherits CPU specificity from BSQ_ALLOCATION */
312P4_EVDESCR(SSE_INPUT_ASSIST, 0x34, 0x01, TRUE, FIRM_ESCR0, FIRM_ESCR1),
313P4_EVDESCR(PACKED_SP_UOP, 0x08, 0x01, TRUE, FIRM_ESCR0, FIRM_ESCR1),
314P4_EVDESCR(PACKED_DP_UOP, 0x0C, 0x01, TRUE, FIRM_ESCR0, FIRM_ESCR1),
315P4_EVDESCR(SCALAR_SP_UOP, 0x0A, 0x01, TRUE, FIRM_ESCR0, FIRM_ESCR1),
316P4_EVDESCR(SCALAR_DP_UOP, 0x0E, 0x01, TRUE, FIRM_ESCR0, FIRM_ESCR1),
317P4_EVDESCR(64BIT_MMX_UOP, 0x02, 0x01, TRUE, FIRM_ESCR0, FIRM_ESCR1),
318P4_EVDESCR(128BIT_MMX_UOP, 0x1A, 0x01, TRUE, FIRM_ESCR0, FIRM_ESCR1),
319P4_EVDESCR(X87_FP_UOP, 0x04, 0x01, TRUE, FIRM_ESCR0, FIRM_ESCR1),
320P4_EVDESCR(X87_SIMD_MOVES_UOP, 0x2E, 0x01, TRUE, FIRM_ESCR0, FIRM_ESCR1),
321P4_EVDESCR(GLOBAL_POWER_EVENTS, 0x13, 0x06, FALSE, FSB_ESCR0, FSB_ESCR1),
322P4_EVDESCR(TC_MS_XFER, 0x05, 0x00, FALSE, MS_ESCR0, MS_ESCR1),
323P4_EVDESCR(UOP_QUEUE_WRITES, 0x09, 0x00, FALSE, MS_ESCR0, MS_ESCR1),
324P4_EVDESCR(RETIRED_MISPRED_BRANCH_TYPE,
325 0x05, 0x02, FALSE, TBPU_ESCR0, TBPU_ESCR1),
326P4_EVDESCR(RETIRED_BRANCH_TYPE, 0x04, 0x02, FALSE, TBPU_ESCR0, TBPU_ESCR1),
327P4_EVDESCR(RESOURCE_STALL, 0x01, 0x01, FALSE, ALF_ESCR0, ALF_ESCR1),
328P4_EVDESCR(WC_BUFFER, 0x05, 0x05, TRUE, DAC_ESCR0, DAC_ESCR1),
329P4_EVDESCR(B2B_CYCLES, 0x16, 0x03, TRUE, FSB_ESCR0, FSB_ESCR1),
330P4_EVDESCR(BNR, 0x08, 0x03, TRUE, FSB_ESCR0, FSB_ESCR1),
331P4_EVDESCR(SNOOP, 0x06, 0x03, TRUE, FSB_ESCR0, FSB_ESCR1),
332P4_EVDESCR(RESPONSE, 0x04, 0x03, TRUE, FSB_ESCR0, FSB_ESCR1),
333P4_EVDESCR(FRONT_END_EVENT, 0x08, 0x05, FALSE, CRU_ESCR2, CRU_ESCR3),
334P4_EVDESCR(EXECUTION_EVENT, 0x0C, 0x05, FALSE, CRU_ESCR2, CRU_ESCR3),
335P4_EVDESCR(REPLAY_EVENT, 0x09, 0x05, FALSE, CRU_ESCR2, CRU_ESCR3),
336P4_EVDESCR(INSTR_RETIRED, 0x02, 0x04, FALSE, CRU_ESCR0, CRU_ESCR1),
337P4_EVDESCR(UOPS_RETIRED, 0x01, 0x04, FALSE, CRU_ESCR0, CRU_ESCR1),
338P4_EVDESCR(UOP_TYPE, 0x02, 0x02, FALSE, RAT_ESCR0, RAT_ESCR1),
339P4_EVDESCR(BRANCH_RETIRED, 0x06, 0x05, FALSE, CRU_ESCR2, CRU_ESCR3),
340P4_EVDESCR(MISPRED_BRANCH_RETIRED, 0x03, 0x04, FALSE, CRU_ESCR0, CRU_ESCR1),
341P4_EVDESCR(X87_ASSIST, 0x03, 0x05, FALSE, CRU_ESCR2, CRU_ESCR3),
342P4_EVDESCR(MACHINE_CLEAR, 0x02, 0x05, FALSE, CRU_ESCR2, CRU_ESCR3)
343
344#undef P4_EVDESCR
345};
346
347#define P4_EVENT_IS_TI(E) ((E)->pm_is_ti_event == TRUE)
348
349#define P4_NEVENTS (PMC_EV_P4_LAST - PMC_EV_P4_FIRST + 1)
350
351/*
352 * P4 PMC descriptors
353 */
354
355struct p4pmc_descr {
356 struct pmc_descr pm_descr; /* common information */
357 enum pmc_p4pmc pm_pmcnum; /* PMC number */
358 uint32_t pm_pmc_msr; /* PERFCTR MSR address */
359 uint32_t pm_cccr_msr; /* CCCR MSR address */
360};
361
362static struct p4pmc_descr p4_pmcdesc[P4_NPMCS] = {
363#define P4_PMC_CAPS (PMC_CAP_INTERRUPT | PMC_CAP_USER | PMC_CAP_SYSTEM | \
364 PMC_CAP_EDGE | PMC_CAP_THRESHOLD | PMC_CAP_READ | PMC_CAP_WRITE | \
365 PMC_CAP_INVERT | PMC_CAP_QUALIFIER | PMC_CAP_PRECISE | \
366 PMC_CAP_TAGGING | PMC_CAP_CASCADE)
367
368#define P4_PMCDESCR(N, PMC, CCCR) \
369 { \
370 .pm_descr = \
371 { \
372 .pd_name = #N, \
373 .pd_class = PMC_CLASS_P4, \
374 .pd_caps = P4_PMC_CAPS, \
375 .pd_width = 40 \
376 }, \
377 .pm_pmcnum = P4_PMC_##N, \
378 .pm_cccr_msr = (CCCR), \
379 .pm_pmc_msr = (PMC) \
380 }
381
382 P4_PMCDESCR(BPU_COUNTER0, 0x300, 0x360),
383 P4_PMCDESCR(BPU_COUNTER1, 0x301, 0x361),
384 P4_PMCDESCR(BPU_COUNTER2, 0x302, 0x362),
385 P4_PMCDESCR(BPU_COUNTER3, 0x303, 0x363),
386 P4_PMCDESCR(MS_COUNTER0, 0x304, 0x364),
387 P4_PMCDESCR(MS_COUNTER1, 0x305, 0x365),
388 P4_PMCDESCR(MS_COUNTER2, 0x306, 0x366),
389 P4_PMCDESCR(MS_COUNTER3, 0x307, 0x367),
390 P4_PMCDESCR(FLAME_COUNTER0, 0x308, 0x368),
391 P4_PMCDESCR(FLAME_COUNTER1, 0x309, 0x369),
392 P4_PMCDESCR(FLAME_COUNTER2, 0x30A, 0x36A),
393 P4_PMCDESCR(FLAME_COUNTER3, 0x30B, 0x36B),
394 P4_PMCDESCR(IQ_COUNTER0, 0x30C, 0x36C),
395 P4_PMCDESCR(IQ_COUNTER1, 0x30D, 0x36D),
396 P4_PMCDESCR(IQ_COUNTER2, 0x30E, 0x36E),
397 P4_PMCDESCR(IQ_COUNTER3, 0x30F, 0x36F),
398 P4_PMCDESCR(IQ_COUNTER4, 0x310, 0x370),
399 P4_PMCDESCR(IQ_COUNTER5, 0x311, 0x371),
400
401#undef P4_PMCDESCR
402};
403
404/* HTT support */
405#define P4_NHTT 2 /* logical processors/chip */
406
407static int p4_system_has_htt;
408
409/*
410 * Per-CPU data structure for P4 class CPUs
411 *
412 * [19 struct pmc_hw structures]
413 * [45 ESCRs status bytes]
414 * [per-cpu spin mutex]
415 * [19 flag fields for holding config flags and a runcount]
416 * [19*2 hw value fields] (Thread mode PMC support)
417 * or
418 * [19*2 EIP values] (Sampling mode PMCs)
419 * [19*2 pmc value fields] (Thread mode PMC support))
420 */
421
422struct p4_cpu {
423 struct pmc_hw pc_p4pmcs[P4_NPMCS];
424 char pc_escrs[P4_NESCR];
425 struct mtx pc_mtx; /* spin lock */
426 uint32_t pc_intrflag; /* NMI handler flags */
427 unsigned int pc_intrlock; /* NMI handler spin lock */
428 unsigned char pc_flags[P4_NPMCS]; /* 4 bits each: {cfg,run}count */
429 union {
430 pmc_value_t pc_hw[P4_NPMCS * P4_NHTT];
431 uintptr_t pc_ip[P4_NPMCS * P4_NHTT];
432 } pc_si;
433 pmc_value_t pc_pmc_values[P4_NPMCS * P4_NHTT];
434};
435
436static struct p4_cpu **p4_pcpu;
437
438#define P4_PCPU_PMC_VALUE(PC,RI,CPU) (PC)->pc_pmc_values[(RI)*((CPU) & 1)]
439#define P4_PCPU_HW_VALUE(PC,RI,CPU) (PC)->pc_si.pc_hw[(RI)*((CPU) & 1)]
440#define P4_PCPU_SAVED_IP(PC,RI,CPU) (PC)->pc_si.pc_ip[(RI)*((CPU) & 1)]
441
442#define P4_PCPU_GET_FLAGS(PC,RI,MASK) ((PC)->pc_flags[(RI)] & (MASK))
443#define P4_PCPU_SET_FLAGS(PC,RI,MASK,VAL) do { \
444 char _tmp; \
445 _tmp = (PC)->pc_flags[(RI)]; \
446 _tmp &= ~(MASK); \
447 _tmp |= (VAL) & (MASK); \
448 (PC)->pc_flags[(RI)] = _tmp; \
449} while (0)
450
451#define P4_PCPU_GET_RUNCOUNT(PC,RI) P4_PCPU_GET_FLAGS(PC,RI,0x0F)
452#define P4_PCPU_SET_RUNCOUNT(PC,RI,V) P4_PCPU_SET_FLAGS(PC,RI,0x0F,V)
453
454#define P4_PCPU_GET_CFGFLAGS(PC,RI) (P4_PCPU_GET_FLAGS(PC,RI,0xF0) >> 4)
455#define P4_PCPU_SET_CFGFLAGS(PC,RI,C) P4_PCPU_SET_FLAGS(PC,RI,0xF0,((C) <<4))
456
457#define P4_CPU_TO_FLAG(C) (P4_CPU_IS_HTT_SECONDARY(cpu) ? 0x2 : 0x1)
458
459#define P4_PCPU_GET_INTRFLAG(PC,I) ((PC)->pc_intrflag & (1 << (I)))
460#define P4_PCPU_SET_INTRFLAG(PC,I,V) do { \
461 uint32_t __mask; \
462 __mask = 1 << (I); \
463 if ((V)) \
464 (PC)->pc_intrflag |= __mask; \
465 else \
466 (PC)->pc_intrflag &= ~__mask; \
467 } while (0)
468
469/*
470 * A minimal spin lock implementation for use inside the NMI handler.
471 *
472 * We don't want to use a regular spin lock here, because curthread
473 * may not be consistent at the time the handler is invoked.
474 */
475#define P4_PCPU_ACQ_INTR_SPINLOCK(PC) do { \
476 while (!atomic_cmpset_acq_int(&pc->pc_intrlock, 0, 1)) \
477 ia32_pause(); \
478 } while (0)
479#define P4_PCPU_REL_INTR_SPINLOCK(PC) \
480 atomic_store_rel_int(&pc->pc_intrlock, 0);
481
482/* ESCR row disposition */
483static int p4_escrdisp[P4_NESCR];
484
485#define P4_ESCR_ROW_DISP_IS_THREAD(E) (p4_escrdisp[(E)] > 0)
486#define P4_ESCR_ROW_DISP_IS_STANDALONE(E) (p4_escrdisp[(E)] < 0)
487#define P4_ESCR_ROW_DISP_IS_FREE(E) (p4_escrdisp[(E)] == 0)
488
489#define P4_ESCR_MARK_ROW_STANDALONE(E) do { \
490 KASSERT(p4_escrdisp[(E)] <= 0, ("[p4,%d] row disposition error",\
491 __LINE__)); \
492 atomic_add_int(&p4_escrdisp[(E)], -1); \
493 KASSERT(p4_escrdisp[(E)] >= (-pmc_cpu_max_active()), \
494 ("[p4,%d] row disposition error", __LINE__)); \
495} while (0)
496
497#define P4_ESCR_UNMARK_ROW_STANDALONE(E) do { \
498 atomic_add_int(&p4_escrdisp[(E)], 1); \
499 KASSERT(p4_escrdisp[(E)] <= 0, ("[p4,%d] row disposition error",\
500 __LINE__)); \
501} while (0)
502
503#define P4_ESCR_MARK_ROW_THREAD(E) do { \
504 KASSERT(p4_escrdisp[(E)] >= 0, ("[p4,%d] row disposition error", \
505 __LINE__)); \
506 atomic_add_int(&p4_escrdisp[(E)], 1); \
507} while (0)
508
509#define P4_ESCR_UNMARK_ROW_THREAD(E) do { \
510 atomic_add_int(&p4_escrdisp[(E)], -1); \
511 KASSERT(p4_escrdisp[(E)] >= 0, ("[p4,%d] row disposition error", \
512 __LINE__)); \
513} while (0)
514
515#define P4_PMC_IS_STOPPED(cccr) ((rdmsr(cccr) & P4_CCCR_ENABLE) == 0)
516
517#define P4_CPU_IS_HTT_SECONDARY(cpu) \
518 (p4_system_has_htt ? ((cpu) & 1) : 0)
519#define P4_TO_HTT_PRIMARY(cpu) \
520 (p4_system_has_htt ? ((cpu) & ~1) : (cpu))
521
522#define P4_CCCR_Tx_MASK (~(P4_CCCR_OVF_PMI_T0|P4_CCCR_OVF_PMI_T1| \
523 P4_CCCR_ENABLE|P4_CCCR_OVF))
524#define P4_ESCR_Tx_MASK (~(P4_ESCR_T0_OS|P4_ESCR_T0_USR|P4_ESCR_T1_OS| \
525 P4_ESCR_T1_USR))
526
527/*
528 * support routines
529 */
530
531static struct p4_event_descr *
532p4_find_event(enum pmc_event ev)
533{
534 int n;
535
536 for (n = 0; n < P4_NEVENTS; n++)
537 if (p4_events[n].pm_event == ev)
538 break;
539 if (n == P4_NEVENTS)
540 return (NULL);
541 return (&p4_events[n]);
542}
543
544/*
545 * Initialize per-cpu state
546 */
547
548static int
549p4_pcpu_init(struct pmc_mdep *md, int cpu)
550{
551 char *pescr;
552 int n, first_ri, phycpu;
553 struct pmc_hw *phw;
554 struct p4_cpu *p4c;
555 struct pmc_cpu *pc, *plc;
556
557 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
558 ("[p4,%d] insane cpu number %d", __LINE__, cpu));
559
560 PMCDBG(MDP,INI,0, "p4-init cpu=%d is-primary=%d", cpu,
561 pmc_cpu_is_primary(cpu) != 0);
562
563 first_ri = md->pmd_classdep[PMC_MDEP_CLASS_INDEX_P4].pcd_ri;
564
565 /*
566 * The two CPUs in an HT pair share their per-cpu state.
567 *
568 * For HT capable CPUs, we assume that the two logical
569 * processors in the HT pair get two consecutive CPU ids
570 * starting with an even id #.
571 *
572 * The primary CPU (the even numbered CPU of the pair) would
573 * have been initialized prior to the initialization for the
574 * secondary.
575 */
576
577 if (!pmc_cpu_is_primary(cpu) && (cpu & 1)) {
578
579 p4_system_has_htt = 1;
580
581 phycpu = P4_TO_HTT_PRIMARY(cpu);
582 pc = pmc_pcpu[phycpu];
583 plc = pmc_pcpu[cpu];
584
585 KASSERT(plc != pc, ("[p4,%d] per-cpu config error", __LINE__));
586
587 PMCDBG(MDP,INI,1, "p4-init cpu=%d phycpu=%d pc=%p", cpu,
588 phycpu, pc);
589 KASSERT(pc, ("[p4,%d] Null Per-Cpu state cpu=%d phycpu=%d",
590 __LINE__, cpu, phycpu));
591
592 /* PMCs are shared with the physical CPU. */
593 for (n = 0; n < P4_NPMCS; n++)
594 plc->pc_hwpmcs[n + first_ri] =
595 pc->pc_hwpmcs[n + first_ri];
596
597 return (0);
598 }
599
600 p4c = malloc(sizeof(struct p4_cpu), M_PMC, M_WAITOK|M_ZERO);
601
602 if (p4c == NULL)
603 return (ENOMEM);
604
605 pc = pmc_pcpu[cpu];
606
607 KASSERT(pc != NULL, ("[p4,%d] cpu %d null per-cpu", __LINE__, cpu));
608
609 p4_pcpu[cpu] = p4c;
610 phw = p4c->pc_p4pmcs;
611
612 for (n = 0; n < P4_NPMCS; n++, phw++) {
613 phw->phw_state = PMC_PHW_FLAG_IS_ENABLED |
614 PMC_PHW_CPU_TO_STATE(cpu) | PMC_PHW_INDEX_TO_STATE(n);
615 phw->phw_pmc = NULL;
616 pc->pc_hwpmcs[n + first_ri] = phw;
617 }
618
619 pescr = p4c->pc_escrs;
620 for (n = 0; n < P4_NESCR; n++)
621 *pescr++ = P4_INVALID_PMC_INDEX;
622
623 mtx_init(&p4c->pc_mtx, "p4-pcpu", "pmc-leaf", MTX_SPIN);
624
625 return (0);
626}
627
628/*
629 * Destroy per-cpu state.
630 */
631
632static int
633p4_pcpu_fini(struct pmc_mdep *md, int cpu)
634{
635 int first_ri, i;
636 struct p4_cpu *p4c;
637 struct pmc_cpu *pc;
638
639 PMCDBG(MDP,INI,0, "p4-cleanup cpu=%d", cpu);
640
641 pc = pmc_pcpu[cpu];
642 first_ri = md->pmd_classdep[PMC_MDEP_CLASS_INDEX_P4].pcd_ri;
643
644 for (i = 0; i < P4_NPMCS; i++)
645 pc->pc_hwpmcs[i + first_ri] = NULL;
646
647 if (!pmc_cpu_is_primary(cpu) && (cpu & 1))
648 return (0);
649
650 p4c = p4_pcpu[cpu];
651
652 KASSERT(p4c != NULL, ("[p4,%d] NULL pcpu", __LINE__));
653
654 /* Turn off all PMCs on this CPU */
655 for (i = 0; i < P4_NPMCS - 1; i++)
656 wrmsr(P4_CCCR_MSR_FIRST + i,
657 rdmsr(P4_CCCR_MSR_FIRST + i) & ~P4_CCCR_ENABLE);
658
659 mtx_destroy(&p4c->pc_mtx);
660
661 free(p4c, M_PMC);
662
663 p4_pcpu[cpu] = NULL;
664
665 return (0);
666}
667
668/*
669 * Read a PMC
670 */
671
672static int
673p4_read_pmc(int cpu, int ri, pmc_value_t *v)
674{
675 struct pmc *pm;
676 pmc_value_t tmp;
677 struct p4_cpu *pc;
678 enum pmc_mode mode;
679 struct p4pmc_descr *pd;
680
681 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
682 ("[p4,%d] illegal CPU value %d", __LINE__, cpu));
683 KASSERT(ri >= 0 && ri < P4_NPMCS,
684 ("[p4,%d] illegal row-index %d", __LINE__, ri));
685
686 pc = p4_pcpu[P4_TO_HTT_PRIMARY(cpu)];
687 pm = pc->pc_p4pmcs[ri].phw_pmc;
688 pd = &p4_pmcdesc[ri];
689
690 KASSERT(pm != NULL,
691 ("[p4,%d] No owner for HWPMC [cpu%d,pmc%d]", __LINE__, cpu, ri));
692
693 KASSERT(pd->pm_descr.pd_class == PMC_TO_CLASS(pm),
694 ("[p4,%d] class mismatch pd %d != id class %d", __LINE__,
695 pd->pm_descr.pd_class, PMC_TO_CLASS(pm)));
696
697 mode = PMC_TO_MODE(pm);
698
699 PMCDBG(MDP,REA,1, "p4-read cpu=%d ri=%d mode=%d", cpu, ri, mode);
700
701 KASSERT(pd->pm_descr.pd_class == PMC_CLASS_P4,
702 ("[p4,%d] unknown PMC class %d", __LINE__, pd->pm_descr.pd_class));
703
704 tmp = rdmsr(p4_pmcdesc[ri].pm_pmc_msr);
705
706 if (PMC_IS_VIRTUAL_MODE(mode)) {
707 if (tmp < P4_PCPU_HW_VALUE(pc,ri,cpu)) /* 40 bit overflow */
708 tmp += (P4_PERFCTR_MASK + 1) -
709 P4_PCPU_HW_VALUE(pc,ri,cpu);
710 else
711 tmp -= P4_PCPU_HW_VALUE(pc,ri,cpu);
712 tmp += P4_PCPU_PMC_VALUE(pc,ri,cpu);
713 }
714
715 if (PMC_IS_SAMPLING_MODE(mode)) /* undo transformation */
716 *v = P4_PERFCTR_VALUE_TO_RELOAD_COUNT(tmp);
717 else
718 *v = tmp;
719
720 PMCDBG(MDP,REA,2, "p4-read -> %jx", *v);
721
722 return (0);
723}
724
725/*
726 * Write a PMC
727 */
728
729static int
730p4_write_pmc(int cpu, int ri, pmc_value_t v)
731{
732 enum pmc_mode mode;
733 struct pmc *pm;
734 struct p4_cpu *pc;
735 const struct pmc_hw *phw;
736 const struct p4pmc_descr *pd;
737
738 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
739 ("[amd,%d] illegal CPU value %d", __LINE__, cpu));
740 KASSERT(ri >= 0 && ri < P4_NPMCS,
741 ("[amd,%d] illegal row-index %d", __LINE__, ri));
742
743 pc = p4_pcpu[P4_TO_HTT_PRIMARY(cpu)];
744 phw = &pc->pc_p4pmcs[ri];
745 pm = phw->phw_pmc;
746 pd = &p4_pmcdesc[ri];
747
748 KASSERT(pm != NULL,
749 ("[p4,%d] No owner for HWPMC [cpu%d,pmc%d]", __LINE__,
750 cpu, ri));
751
752 mode = PMC_TO_MODE(pm);
753
754 PMCDBG(MDP,WRI,1, "p4-write cpu=%d ri=%d mode=%d v=%jx", cpu, ri,
755 mode, v);
756
757 /*
758 * write the PMC value to the register/saved value: for
759 * sampling mode PMCs, the value to be programmed into the PMC
760 * counter is -(C+1) where 'C' is the requested sample rate.
761 */
762 if (PMC_IS_SAMPLING_MODE(mode))
763 v = P4_RELOAD_COUNT_TO_PERFCTR_VALUE(v);
764
765 if (PMC_IS_SYSTEM_MODE(mode))
766 wrmsr(pd->pm_pmc_msr, v);
767 else
768 P4_PCPU_PMC_VALUE(pc,ri,cpu) = v;
769
770 return (0);
771}
772
773/*
774 * Configure a PMC 'pm' on the given CPU and row-index.
775 *
776 * 'pm' may be NULL to indicate de-configuration.
777 *
778 * On HTT systems, a PMC may get configured twice, once for each
779 * "logical" CPU. We track this using the CFGFLAGS field of the
780 * per-cpu state; this field is a bit mask with one bit each for
781 * logical CPUs 0 & 1.
782 */
783
784static int
785p4_config_pmc(int cpu, int ri, struct pmc *pm)
786{
787 struct pmc_hw *phw;
788 struct p4_cpu *pc;
789 int cfgflags, cpuflag;
790
791 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
792 ("[p4,%d] illegal CPU %d", __LINE__, cpu));
793
794 KASSERT(ri >= 0 && ri < P4_NPMCS,
795 ("[p4,%d] illegal row-index %d", __LINE__, ri));
796
797 PMCDBG(MDP,CFG,1, "cpu=%d ri=%d pm=%p", cpu, ri, pm);
798
799 pc = p4_pcpu[P4_TO_HTT_PRIMARY(cpu)];
800 phw = &pc->pc_p4pmcs[ri];
801
802 KASSERT(pm == NULL || phw->phw_pmc == NULL ||
803 (p4_system_has_htt && phw->phw_pmc == pm),
804 ("[p4,%d] hwpmc not unconfigured before re-config", __LINE__));
805
806 mtx_lock_spin(&pc->pc_mtx);
807 cfgflags = P4_PCPU_GET_CFGFLAGS(pc,ri);
808
809 KASSERT(cfgflags >= 0 || cfgflags <= 3,
810 ("[p4,%d] illegal cfgflags cfg=%d on cpu=%d ri=%d", __LINE__,
811 cfgflags, cpu, ri));
812
813 KASSERT(cfgflags == 0 || phw->phw_pmc,
814 ("[p4,%d] cpu=%d ri=%d pmc configured with zero cfg count",
815 __LINE__, cpu, ri));
816
817 cpuflag = P4_CPU_TO_FLAG(cpu);
818
819 if (pm) { /* config */
820 if (cfgflags == 0)
821 phw->phw_pmc = pm;
822
823 KASSERT(phw->phw_pmc == pm,
824 ("[p4,%d] cpu=%d ri=%d config %p != hw %p",
825 __LINE__, cpu, ri, pm, phw->phw_pmc));
826
827 cfgflags |= cpuflag;
828 } else { /* unconfig */
829 cfgflags &= ~cpuflag;
830
831 if (cfgflags == 0)
832 phw->phw_pmc = NULL;
833 }
834
835 KASSERT(cfgflags >= 0 || cfgflags <= 3,
836 ("[p4,%d] illegal runcount cfg=%d on cpu=%d ri=%d", __LINE__,
837 cfgflags, cpu, ri));
838
839 P4_PCPU_SET_CFGFLAGS(pc,ri,cfgflags);
840
841 mtx_unlock_spin(&pc->pc_mtx);
842
843 return (0);
844}
845
846/*
847 * Retrieve a configured PMC pointer from hardware state.
848 */
849
850static int
851p4_get_config(int cpu, int ri, struct pmc **ppm)
852{
853 int cfgflags;
854 struct p4_cpu *pc;
855
856 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
857 ("[p4,%d] illegal CPU %d", __LINE__, cpu));
858 KASSERT(ri >= 0 && ri < P4_NPMCS,
859 ("[p4,%d] illegal row-index %d", __LINE__, ri));
860
861 pc = p4_pcpu[P4_TO_HTT_PRIMARY(cpu)];
862
863 mtx_lock_spin(&pc->pc_mtx);
864 cfgflags = P4_PCPU_GET_CFGFLAGS(pc,ri);
865 mtx_unlock_spin(&pc->pc_mtx);
866
867 if (cfgflags & P4_CPU_TO_FLAG(cpu))
868 *ppm = pc->pc_p4pmcs[ri].phw_pmc; /* PMC config'ed on this CPU */
869 else
870 *ppm = NULL;
871
872 return 0;
873}
874
875/*
876 * Allocate a PMC.
877 *
878 * The allocation strategy differs between HTT and non-HTT systems.
879 *
880 * The non-HTT case:
881 * - Given the desired event and the PMC row-index, lookup the
882 * list of valid ESCRs for the event.
883 * - For each valid ESCR:
884 * - Check if the ESCR is free and the ESCR row is in a compatible
885 * mode (i.e., system or process))
886 * - Check if the ESCR is usable with a P4 PMC at the desired row-index.
887 * If everything matches, we determine the appropriate bit values for the
888 * ESCR and CCCR registers.
889 *
890 * The HTT case:
891 *
892 * - Process mode PMCs require special care. The FreeBSD scheduler could
893 * schedule any two processes on the same physical CPU. We need to ensure
894 * that a given PMC row-index is never allocated to two different
895 * PMCs owned by different user-processes.
896 * This is ensured by always allocating a PMC from a 'FREE' PMC row
897 * if the system has HTT active.
898 * - A similar check needs to be done for ESCRs; we do not want two PMCs
899 * using the same ESCR to be scheduled at the same time. Thus ESCR
900 * allocation is also restricted to FREE rows if the system has HTT
901 * enabled.
902 * - Thirdly, some events are 'thread-independent' terminology, i.e.,
903 * the PMC hardware cannot distinguish between events caused by
904 * different logical CPUs. This makes it impossible to assign events
905 * to a given thread of execution. If the system has HTT enabled,
906 * these events are not allowed for process-mode PMCs.
907 */
908
909static int
910p4_allocate_pmc(int cpu, int ri, struct pmc *pm,
911 const struct pmc_op_pmcallocate *a)
912{
913 int found, n, m;
914 uint32_t caps, cccrvalue, escrvalue, tflags;
915 enum pmc_p4escr escr;
916 struct p4_cpu *pc;
917 struct p4_event_descr *pevent;
918 const struct p4pmc_descr *pd;
919
920 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
921 ("[p4,%d] illegal CPU %d", __LINE__, cpu));
922 KASSERT(ri >= 0 && ri < P4_NPMCS,
923 ("[p4,%d] illegal row-index value %d", __LINE__, ri));
924
925 pd = &p4_pmcdesc[ri];
926
927 PMCDBG(MDP,ALL,1, "p4-allocate ri=%d class=%d pmccaps=0x%x "
928 "reqcaps=0x%x", ri, pd->pm_descr.pd_class, pd->pm_descr.pd_caps,
929 pm->pm_caps);
930
931 /* check class */
932 if (pd->pm_descr.pd_class != a->pm_class)
933 return (EINVAL);
934
935 /* check requested capabilities */
936 caps = a->pm_caps;
937 if ((pd->pm_descr.pd_caps & caps) != caps)
938 return (EPERM);
939
940 /*
941 * If the system has HTT enabled, and the desired allocation
942 * mode is process-private, and the PMC row disposition is not
943 * FREE (0), decline the allocation.
944 */
945
946 if (p4_system_has_htt &&
947 PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)) &&
948 pmc_getrowdisp(ri) != 0)
949 return (EBUSY);
950
951 KASSERT(pd->pm_descr.pd_class == PMC_CLASS_P4,
952 ("[p4,%d] unknown PMC class %d", __LINE__,
953 pd->pm_descr.pd_class));
954
955 if (pm->pm_event < PMC_EV_P4_FIRST ||
956 pm->pm_event > PMC_EV_P4_LAST)
957 return (EINVAL);
958
959 if ((pevent = p4_find_event(pm->pm_event)) == NULL)
960 return (ESRCH);
961
962 PMCDBG(MDP,ALL,2, "pevent={ev=%d,escrsel=0x%x,cccrsel=0x%x,isti=%d}",
963 pevent->pm_event, pevent->pm_escr_eventselect,
964 pevent->pm_cccr_select, pevent->pm_is_ti_event);
965
966 /*
967 * Some PMC events are 'thread independent'and therefore
968 * cannot be used for process-private modes if HTT is being
969 * used.
970 */
971
972 if (P4_EVENT_IS_TI(pevent) &&
973 PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)) &&
974 p4_system_has_htt)
975 return (EINVAL);
976
977 pc = p4_pcpu[P4_TO_HTT_PRIMARY(cpu)];
978
979 found = 0;
980
981 /* look for a suitable ESCR for this event */
982 for (n = 0; n < P4_MAX_ESCR_PER_EVENT && !found; n++) {
983 if ((escr = pevent->pm_escrs[n]) == P4_ESCR_NONE)
984 break; /* out of ESCRs */
985 /*
986 * Check ESCR row disposition.
987 *
988 * If the request is for a system-mode PMC, then the
989 * ESCR row should not be in process-virtual mode, and
990 * should also be free on the current CPU.
991 */
992
993 if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) {
994 if (P4_ESCR_ROW_DISP_IS_THREAD(escr) ||
995 pc->pc_escrs[escr] != P4_INVALID_PMC_INDEX)
996 continue;
997 }
998
999 /*
1000 * If the request is for a process-virtual PMC, and if
1001 * HTT is not enabled, we can use an ESCR row that is
1002 * either FREE or already in process mode.
1003 *
1004 * If HTT is enabled, then we need to ensure that a
1005 * given ESCR is never allocated to two PMCS that
1006 * could run simultaneously on the two logical CPUs of
1007 * a CPU package. We ensure this be only allocating
1008 * ESCRs from rows marked as 'FREE'.
1009 */
1010
1011 if (PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) {
1012 if (p4_system_has_htt) {
1013 if (!P4_ESCR_ROW_DISP_IS_FREE(escr))
1014 continue;
1015 } else
1016 if (P4_ESCR_ROW_DISP_IS_STANDALONE(escr))
1017 continue;
1018 }
1019
1020 /*
1021 * We found a suitable ESCR for this event. Now check if
1022 * this escr can work with the PMC at row-index 'ri'.
1023 */
1024
1025 for (m = 0; m < P4_MAX_PMC_PER_ESCR; m++)
1026 if (p4_escrs[escr].pm_pmcs[m] == pd->pm_pmcnum) {
1027 found = 1;
1028 break;
1029 }
1030 }
1031
1032 if (found == 0)
1033 return (ESRCH);
1034
1035 KASSERT((int) escr >= 0 && escr < P4_NESCR,
1036 ("[p4,%d] illegal ESCR value %d", __LINE__, escr));
1037
1038 /* mark ESCR row mode */
1039 if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) {
1040 pc->pc_escrs[escr] = ri; /* mark ESCR as in use on this cpu */
1041 P4_ESCR_MARK_ROW_STANDALONE(escr);
1042 } else {
1043 KASSERT(pc->pc_escrs[escr] == P4_INVALID_PMC_INDEX,
1044 ("[p4,%d] escr[%d] already in use", __LINE__, escr));
1045 P4_ESCR_MARK_ROW_THREAD(escr);
1046 }
1047
1048 pm->pm_md.pm_p4.pm_p4_escrmsr = p4_escrs[escr].pm_escr_msr;
1049 pm->pm_md.pm_p4.pm_p4_escr = escr;
1050
1051 cccrvalue = P4_CCCR_TO_ESCR_SELECT(pevent->pm_cccr_select);
1052 escrvalue = P4_ESCR_TO_EVENT_SELECT(pevent->pm_escr_eventselect);
1053
1054 /* CCCR fields */
1055 if (caps & PMC_CAP_THRESHOLD)
1056 cccrvalue |= (a->pm_md.pm_p4.pm_p4_cccrconfig &
1057 P4_CCCR_THRESHOLD_MASK) | P4_CCCR_COMPARE;
1058
1059 if (caps & PMC_CAP_EDGE)
1060 cccrvalue |= P4_CCCR_EDGE;
1061
1062 if (caps & PMC_CAP_INVERT)
1063 cccrvalue |= P4_CCCR_COMPLEMENT;
1064
1065 if (p4_system_has_htt)
1066 cccrvalue |= a->pm_md.pm_p4.pm_p4_cccrconfig &
1067 P4_CCCR_ACTIVE_THREAD_MASK;
1068 else /* no HTT; thread field should be '11b' */
1069 cccrvalue |= P4_CCCR_TO_ACTIVE_THREAD(0x3);
1070
1071 if (caps & PMC_CAP_CASCADE)
1072 cccrvalue |= P4_CCCR_CASCADE;
1073
1074 /* On HTT systems the PMI T0 field may get moved to T1 at pmc start */
1075 if (caps & PMC_CAP_INTERRUPT)
1076 cccrvalue |= P4_CCCR_OVF_PMI_T0;
1077
1078 /* ESCR fields */
1079 if (caps & PMC_CAP_QUALIFIER)
1080 escrvalue |= a->pm_md.pm_p4.pm_p4_escrconfig &
1081 P4_ESCR_EVENT_MASK_MASK;
1082 if (caps & PMC_CAP_TAGGING)
1083 escrvalue |= (a->pm_md.pm_p4.pm_p4_escrconfig &
1084 P4_ESCR_TAG_VALUE_MASK) | P4_ESCR_TAG_ENABLE;
1085 if (caps & PMC_CAP_QUALIFIER)
1086 escrvalue |= (a->pm_md.pm_p4.pm_p4_escrconfig &
1087 P4_ESCR_EVENT_MASK_MASK);
1088
1089 /* HTT: T0_{OS,USR} bits may get moved to T1 at pmc start */
1090 tflags = 0;
1091 if (caps & PMC_CAP_SYSTEM)
1092 tflags |= P4_ESCR_T0_OS;
1093 if (caps & PMC_CAP_USER)
1094 tflags |= P4_ESCR_T0_USR;
1095 if (tflags == 0)
1096 tflags = (P4_ESCR_T0_OS|P4_ESCR_T0_USR);
1097 escrvalue |= tflags;
1098
1099 pm->pm_md.pm_p4.pm_p4_cccrvalue = cccrvalue;
1100 pm->pm_md.pm_p4.pm_p4_escrvalue = escrvalue;
1101
1102 PMCDBG(MDP,ALL,2, "p4-allocate cccrsel=0x%x cccrval=0x%x "
1103 "escr=%d escrmsr=0x%x escrval=0x%x", pevent->pm_cccr_select,
1104 cccrvalue, escr, pm->pm_md.pm_p4.pm_p4_escrmsr, escrvalue);
1105
1106 return (0);
1107}
1108
1109/*
1110 * release a PMC.
1111 */
1112
1113static int
1114p4_release_pmc(int cpu, int ri, struct pmc *pm)
1115{
1116 enum pmc_p4escr escr;
1117 struct p4_cpu *pc;
1118
1119 KASSERT(ri >= 0 && ri < P4_NPMCS,
1120 ("[p4,%d] illegal row-index %d", __LINE__, ri));
1121
1122 escr = pm->pm_md.pm_p4.pm_p4_escr;
1123
1124 PMCDBG(MDP,REL,1, "p4-release cpu=%d ri=%d escr=%d", cpu, ri, escr);
1125
1126 if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) {
1127 pc = p4_pcpu[P4_TO_HTT_PRIMARY(cpu)];
1128
1129 KASSERT(pc->pc_p4pmcs[ri].phw_pmc == NULL,
1130 ("[p4,%d] releasing configured PMC ri=%d", __LINE__, ri));
1131
1132 P4_ESCR_UNMARK_ROW_STANDALONE(escr);
1133 KASSERT(pc->pc_escrs[escr] == ri,
1134 ("[p4,%d] escr[%d] not allocated to ri %d", __LINE__,
1135 escr, ri));
1136 pc->pc_escrs[escr] = P4_INVALID_PMC_INDEX; /* mark as free */
1137 } else
1138 P4_ESCR_UNMARK_ROW_THREAD(escr);
1139
1140 return (0);
1141}
1142
1143/*
1144 * Start a PMC
1145 */
1146
1147static int
1148p4_start_pmc(int cpu, int ri)
1149{
1150 int rc;
1151 struct pmc *pm;
1152 struct p4_cpu *pc;
1153 struct p4pmc_descr *pd;
1154 uint32_t cccrvalue, cccrtbits, escrvalue, escrmsr, escrtbits;
1155
1156 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
1157 ("[p4,%d] illegal CPU value %d", __LINE__, cpu));
1158 KASSERT(ri >= 0 && ri < P4_NPMCS,
1159 ("[p4,%d] illegal row-index %d", __LINE__, ri));
1160
1161 pc = p4_pcpu[P4_TO_HTT_PRIMARY(cpu)];
1162 pm = pc->pc_p4pmcs[ri].phw_pmc;
1163 pd = &p4_pmcdesc[ri];
1164
1165 KASSERT(pm != NULL,
1166 ("[p4,%d] starting cpu%d,pmc%d with null pmc", __LINE__, cpu, ri));
1167
1168 PMCDBG(MDP,STA,1, "p4-start cpu=%d ri=%d", cpu, ri);
1169
1170 KASSERT(pd->pm_descr.pd_class == PMC_CLASS_P4,
1171 ("[p4,%d] wrong PMC class %d", __LINE__,
1172 pd->pm_descr.pd_class));
1173
1174 /* retrieve the desired CCCR/ESCR values from the PMC */
1175 cccrvalue = pm->pm_md.pm_p4.pm_p4_cccrvalue;
1176 escrvalue = pm->pm_md.pm_p4.pm_p4_escrvalue;
1177 escrmsr = pm->pm_md.pm_p4.pm_p4_escrmsr;
1178
1179 /* extract and zero the logical processor selection bits */
1180 cccrtbits = cccrvalue & P4_CCCR_OVF_PMI_T0;
1181 escrtbits = escrvalue & (P4_ESCR_T0_OS|P4_ESCR_T0_USR);
1182 cccrvalue &= ~P4_CCCR_OVF_PMI_T0;
1183 escrvalue &= ~(P4_ESCR_T0_OS|P4_ESCR_T0_USR);
1184
1185 if (P4_CPU_IS_HTT_SECONDARY(cpu)) { /* shift T0 bits to T1 position */
1186 cccrtbits <<= 1;
1187 escrtbits >>= 2;
1188 }
1189
1190 /* start system mode PMCs directly */
1191 if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) {
1192 wrmsr(escrmsr, escrvalue | escrtbits);
1193 wrmsr(pd->pm_cccr_msr, cccrvalue | cccrtbits | P4_CCCR_ENABLE);
1194 return 0;
1195 }
1196
1197 /*
1198 * Thread mode PMCs
1199 *
1200 * On HTT machines, the same PMC could be scheduled on the
1201 * same physical CPU twice (once for each logical CPU), for
1202 * example, if two threads of a multi-threaded process get
1203 * scheduled on the same CPU.
1204 *
1205 */
1206
1207 mtx_lock_spin(&pc->pc_mtx);
1208
1209 rc = P4_PCPU_GET_RUNCOUNT(pc,ri);
1210 KASSERT(rc == 0 || rc == 1,
1211 ("[p4,%d] illegal runcount cpu=%d ri=%d rc=%d", __LINE__, cpu, ri,
1212 rc));
1213
1214 if (rc == 0) { /* 1st CPU and the non-HTT case */
1215
1216 KASSERT(P4_PMC_IS_STOPPED(pd->pm_cccr_msr),
1217 ("[p4,%d] cpu=%d ri=%d cccr=0x%x not stopped", __LINE__,
1218 cpu, ri, pd->pm_cccr_msr));
1219
1220 /* write out the low 40 bits of the saved value to hardware */
1221 wrmsr(pd->pm_pmc_msr,
1222 P4_PCPU_PMC_VALUE(pc,ri,cpu) & P4_PERFCTR_MASK);
1223
1224 } else if (rc == 1) { /* 2nd CPU */
1225
1226 /*
1227 * Stop the PMC and retrieve the CCCR and ESCR values
1228 * from their MSRs, and turn on the additional T[0/1]
1229 * bits for the 2nd CPU.
1230 */
1231
1232 cccrvalue = rdmsr(pd->pm_cccr_msr);
1233 wrmsr(pd->pm_cccr_msr, cccrvalue & ~P4_CCCR_ENABLE);
1234
1235 /* check that the configuration bits read back match the PMC */
1236 KASSERT((cccrvalue & P4_CCCR_Tx_MASK) ==
1237 (pm->pm_md.pm_p4.pm_p4_cccrvalue & P4_CCCR_Tx_MASK),
1238 ("[p4,%d] Extra CCCR bits cpu=%d rc=%d ri=%d "
1239 "cccr=0x%x PMC=0x%x", __LINE__, cpu, rc, ri,
1240 cccrvalue & P4_CCCR_Tx_MASK,
1241 pm->pm_md.pm_p4.pm_p4_cccrvalue & P4_CCCR_Tx_MASK));
1242 KASSERT(cccrvalue & P4_CCCR_ENABLE,
1243 ("[p4,%d] 2nd cpu rc=%d cpu=%d ri=%d not running",
1244 __LINE__, rc, cpu, ri));
1245 KASSERT((cccrvalue & cccrtbits) == 0,
1246 ("[p4,%d] CCCR T0/T1 mismatch rc=%d cpu=%d ri=%d"
1247 "cccrvalue=0x%x tbits=0x%x", __LINE__, rc, cpu, ri,
1248 cccrvalue, cccrtbits));
1249
1250 escrvalue = rdmsr(escrmsr);
1251
1252 KASSERT((escrvalue & P4_ESCR_Tx_MASK) ==
1253 (pm->pm_md.pm_p4.pm_p4_escrvalue & P4_ESCR_Tx_MASK),
1254 ("[p4,%d] Extra ESCR bits cpu=%d rc=%d ri=%d "
1255 "escr=0x%x pm=0x%x", __LINE__, cpu, rc, ri,
1256 escrvalue & P4_ESCR_Tx_MASK,
1257 pm->pm_md.pm_p4.pm_p4_escrvalue & P4_ESCR_Tx_MASK));
1258 KASSERT((escrvalue & escrtbits) == 0,
1259 ("[p4,%d] ESCR T0/T1 mismatch rc=%d cpu=%d ri=%d "
1260 "escrmsr=0x%x escrvalue=0x%x tbits=0x%x", __LINE__,
1261 rc, cpu, ri, escrmsr, escrvalue, escrtbits));
1262 }
1263
1264 /* Enable the correct bits for this CPU. */
1265 escrvalue |= escrtbits;
1266 cccrvalue |= cccrtbits | P4_CCCR_ENABLE;
1267
1268 /* Save HW value at the time of starting hardware */
1269 P4_PCPU_HW_VALUE(pc,ri,cpu) = rdmsr(pd->pm_pmc_msr);
1270
1271 /* Program the ESCR and CCCR and start the PMC */
1272 wrmsr(escrmsr, escrvalue);
1273 wrmsr(pd->pm_cccr_msr, cccrvalue);
1274
1275 ++rc;
1276 P4_PCPU_SET_RUNCOUNT(pc,ri,rc);
1277
1278 mtx_unlock_spin(&pc->pc_mtx);
1279
1280 PMCDBG(MDP,STA,2,"p4-start cpu=%d rc=%d ri=%d escr=%d "
1281 "escrmsr=0x%x escrvalue=0x%x cccr_config=0x%x v=%jx", cpu, rc,
1282 ri, pm->pm_md.pm_p4.pm_p4_escr, escrmsr, escrvalue,
1283 cccrvalue, P4_PCPU_HW_VALUE(pc,ri,cpu));
1284
1285 return (0);
1286}
1287
1288/*
1289 * Stop a PMC.
1290 */
1291
1292static int
1293p4_stop_pmc(int cpu, int ri)
1294{
1295 int rc;
1296 uint32_t cccrvalue, cccrtbits, escrvalue, escrmsr, escrtbits;
1297 struct pmc *pm;
1298 struct p4_cpu *pc;
1299 struct p4pmc_descr *pd;
1300 pmc_value_t tmp;
1301
1302 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
1303 ("[p4,%d] illegal CPU value %d", __LINE__, cpu));
1304 KASSERT(ri >= 0 && ri < P4_NPMCS,
1305 ("[p4,%d] illegal row index %d", __LINE__, ri));
1306
1307 pd = &p4_pmcdesc[ri];
1308 pc = p4_pcpu[P4_TO_HTT_PRIMARY(cpu)];
1309 pm = pc->pc_p4pmcs[ri].phw_pmc;
1310
1311 KASSERT(pm != NULL,
1312 ("[p4,%d] null pmc for cpu%d, ri%d", __LINE__, cpu, ri));
1313
1314 PMCDBG(MDP,STO,1, "p4-stop cpu=%d ri=%d", cpu, ri);
1315
1316 if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) {
1317 wrmsr(pd->pm_cccr_msr,
1318 pm->pm_md.pm_p4.pm_p4_cccrvalue & ~P4_CCCR_ENABLE);
1319 return (0);
1320 }
1321
1322 /*
1323 * Thread mode PMCs.
1324 *
1325 * On HTT machines, this PMC may be in use by two threads
1326 * running on two logical CPUS. Thus we look at the
1327 * 'runcount' field and only turn off the appropriate TO/T1
1328 * bits (and keep the PMC running) if two logical CPUs were
1329 * using the PMC.
1330 *
1331 */
1332
1333 /* bits to mask */
1334 cccrtbits = P4_CCCR_OVF_PMI_T0;
1335 escrtbits = P4_ESCR_T0_OS | P4_ESCR_T0_USR;
1336 if (P4_CPU_IS_HTT_SECONDARY(cpu)) {
1337 cccrtbits <<= 1;
1338 escrtbits >>= 2;
1339 }
1340
1341 mtx_lock_spin(&pc->pc_mtx);
1342
1343 rc = P4_PCPU_GET_RUNCOUNT(pc,ri);
1344
1345 KASSERT(rc == 2 || rc == 1,
1346 ("[p4,%d] illegal runcount cpu=%d ri=%d rc=%d", __LINE__, cpu, ri,
1347 rc));
1348
1349 --rc;
1350
1351 P4_PCPU_SET_RUNCOUNT(pc,ri,rc);
1352
1353 /* Stop this PMC */
1354 cccrvalue = rdmsr(pd->pm_cccr_msr);
1355 wrmsr(pd->pm_cccr_msr, cccrvalue & ~P4_CCCR_ENABLE);
1356
1357 escrmsr = pm->pm_md.pm_p4.pm_p4_escrmsr;
1358 escrvalue = rdmsr(escrmsr);
1359
1360 /* The current CPU should be running on this PMC */
1361 KASSERT(escrvalue & escrtbits,
1362 ("[p4,%d] ESCR T0/T1 mismatch cpu=%d rc=%d ri=%d escrmsr=0x%x "
1363 "escrvalue=0x%x tbits=0x%x", __LINE__, cpu, rc, ri, escrmsr,
1364 escrvalue, escrtbits));
1365 KASSERT(PMC_IS_COUNTING_MODE(PMC_TO_MODE(pm)) ||
1366 (cccrvalue & cccrtbits),
1367 ("[p4,%d] CCCR T0/T1 mismatch cpu=%d ri=%d cccrvalue=0x%x "
1368 "tbits=0x%x", __LINE__, cpu, ri, cccrvalue, cccrtbits));
1369
1370 /* get the current hardware reading */
1371 tmp = rdmsr(pd->pm_pmc_msr);
1372
1373 if (rc == 1) { /* need to keep the PMC running */
1374 escrvalue &= ~escrtbits;
1375 cccrvalue &= ~cccrtbits;
1376 wrmsr(escrmsr, escrvalue);
1377 wrmsr(pd->pm_cccr_msr, cccrvalue);
1378 }
1379
1380 mtx_unlock_spin(&pc->pc_mtx);
1381
1382 PMCDBG(MDP,STO,2, "p4-stop cpu=%d rc=%d ri=%d escrmsr=0x%x "
1383 "escrval=0x%x cccrval=0x%x v=%jx", cpu, rc, ri, escrmsr,
1384 escrvalue, cccrvalue, tmp);
1385
1386 if (tmp < P4_PCPU_HW_VALUE(pc,ri,cpu)) /* 40 bit counter overflow */
1387 tmp += (P4_PERFCTR_MASK + 1) - P4_PCPU_HW_VALUE(pc,ri,cpu);
1388 else
1389 tmp -= P4_PCPU_HW_VALUE(pc,ri,cpu);
1390
1391 P4_PCPU_PMC_VALUE(pc,ri,cpu) += tmp;
1392
1393 return 0;
1394}
1395
1396/*
1397 * Handle an interrupt.
1398 *
1399 * The hardware sets the CCCR_OVF whenever a counter overflow occurs,
1400 * so the handler examines all the 18 CCCR registers, processing the
1401 * counters that have overflowed.
1402 *
1403 * On HTT machines, the CCCR register is shared and will interrupt
1404 * both logical processors if so configured. Thus multiple logical
1405 * CPUs could enter the NMI service routine at the same time. These
1406 * will get serialized using a per-cpu spinlock dedicated for use in
1407 * the NMI handler.
1408 */
1409
1410static int
1411p4_intr(int cpu, struct trapframe *tf)
1412{
1413 uint32_t cccrval, ovf_mask, ovf_partner;
1414 int did_interrupt, error, ri;
1415 struct p4_cpu *pc;
1416 struct pmc *pm;
1417 pmc_value_t v;
1418
1419 PMCDBG(MDP,INT, 1, "cpu=%d tf=0x%p um=%d", cpu, (void *) tf,
1420 TRAPF_USERMODE(tf));
1421
1422 pc = p4_pcpu[P4_TO_HTT_PRIMARY(cpu)];
1423
1424 ovf_mask = P4_CPU_IS_HTT_SECONDARY(cpu) ?
1425 P4_CCCR_OVF_PMI_T1 : P4_CCCR_OVF_PMI_T0;
1426 ovf_mask |= P4_CCCR_OVF;
1427 if (p4_system_has_htt)
1428 ovf_partner = P4_CPU_IS_HTT_SECONDARY(cpu) ?
1429 P4_CCCR_OVF_PMI_T0 : P4_CCCR_OVF_PMI_T1;
1430 else
1431 ovf_partner = 0;
1432 did_interrupt = 0;
1433
1434 if (p4_system_has_htt)
1435 P4_PCPU_ACQ_INTR_SPINLOCK(pc);
1436
1437 /*
1438 * Loop through all CCCRs, looking for ones that have
1439 * interrupted this CPU.
1440 */
1441 for (ri = 0; ri < P4_NPMCS; ri++) {
1442
1443 /*
1444 * Check if our partner logical CPU has already marked
1445 * this PMC has having interrupted it. If so, reset
1446 * the flag and process the interrupt, but leave the
1447 * hardware alone.
1448 */
1449 if (p4_system_has_htt && P4_PCPU_GET_INTRFLAG(pc,ri)) {
1450 P4_PCPU_SET_INTRFLAG(pc,ri,0);
1451 did_interrupt = 1;
1452
1453 /*
1454 * Ignore de-configured or stopped PMCs.
1455 * Ignore PMCs not in sampling mode.
1456 */
1457 pm = pc->pc_p4pmcs[ri].phw_pmc;
1458 if (pm == NULL ||
1459 pm->pm_state != PMC_STATE_RUNNING ||
1460 !PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) {
1461 continue;
1462 }
1463 (void) pmc_process_interrupt(cpu, pm, tf,
1464 TRAPF_USERMODE(tf));
1465 continue;
1466 }
1467
1468 /*
1469 * Fresh interrupt. Look for the CCCR_OVF bit
1470 * and the OVF_Tx bit for this logical
1471 * processor being set.
1472 */
1473 cccrval = rdmsr(P4_CCCR_MSR_FIRST + ri);
1474
1475 if ((cccrval & ovf_mask) != ovf_mask)
1476 continue;
1477
1478 /*
1479 * If the other logical CPU would also have been
1480 * interrupted due to the PMC being shared, record
1481 * this fact in the per-cpu saved interrupt flag
1482 * bitmask.
1483 */
1484 if (p4_system_has_htt && (cccrval & ovf_partner))
1485 P4_PCPU_SET_INTRFLAG(pc, ri, 1);
1486
1487 v = rdmsr(P4_PERFCTR_MSR_FIRST + ri);
1488
1489 PMCDBG(MDP,INT, 2, "ri=%d v=%jx", ri, v);
1490
1491 /* Stop the counter, and reset the overflow bit */
1492 cccrval &= ~(P4_CCCR_OVF | P4_CCCR_ENABLE);
1493 wrmsr(P4_CCCR_MSR_FIRST + ri, cccrval);
1494
1495 did_interrupt = 1;
1496
1497 /*
1498 * Ignore de-configured or stopped PMCs. Ignore PMCs
1499 * not in sampling mode.
1500 */
1501 pm = pc->pc_p4pmcs[ri].phw_pmc;
1502
1503 if (pm == NULL ||
1504 pm->pm_state != PMC_STATE_RUNNING ||
1505 !PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) {
1506 continue;
1507 }
1508
1509 /*
1510 * Process the interrupt. Re-enable the PMC if
1511 * processing was successful.
1512 */
1513 error = pmc_process_interrupt(cpu, pm, tf,
1514 TRAPF_USERMODE(tf));
1515
1516 /*
1517 * Only the first processor executing the NMI handler
1518 * in a HTT pair will restart a PMC, and that too
1519 * only if there were no errors.
1520 */
1521 v = P4_RELOAD_COUNT_TO_PERFCTR_VALUE(
1522 pm->pm_sc.pm_reloadcount);
1523 wrmsr(P4_PERFCTR_MSR_FIRST + ri, v);
1524 if (error == 0)
1525 wrmsr(P4_CCCR_MSR_FIRST + ri,
1526 cccrval | P4_CCCR_ENABLE);
1527 }
1528
1529 /* allow the other CPU to proceed */
1530 if (p4_system_has_htt)
1531 P4_PCPU_REL_INTR_SPINLOCK(pc);
1532
1533 /*
1534 * On Intel P4 CPUs, the PMC 'pcint' entry in the LAPIC gets
1535 * masked when a PMC interrupts the CPU. We need to unmask
1536 * the interrupt source explicitly.
1537 */
1538
1539 if (did_interrupt)
1540 pmc_x86_lapic_enable_pmc_interrupt();
1541
1542 atomic_add_int(did_interrupt ? &pmc_stats.pm_intr_processed :
1543 &pmc_stats.pm_intr_ignored, 1);
1544
1545 return (did_interrupt);
1546}
1547
1548/*
1549 * Describe a CPU's PMC state.
1550 */
1551
1552static int
1553p4_describe(int cpu, int ri, struct pmc_info *pi,
1554 struct pmc **ppmc)
1555{
1556 int error;
1557 size_t copied;
1558 const struct p4pmc_descr *pd;
1559
1560 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
1561 ("[p4,%d] illegal CPU %d", __LINE__, cpu));
1562 KASSERT(ri >= 0 && ri < P4_NPMCS,
1563 ("[p4,%d] row-index %d out of range", __LINE__, ri));
1564
1565 PMCDBG(MDP,OPS,1,"p4-describe cpu=%d ri=%d", cpu, ri);
1566
1567 if (P4_CPU_IS_HTT_SECONDARY(cpu))
1568 return (EINVAL);
1569
1570 pd = &p4_pmcdesc[ri];
1571
1572 if ((error = copystr(pd->pm_descr.pd_name, pi->pm_name,
1573 PMC_NAME_MAX, &copied)) != 0)
1574 return (error);
1575
1576 pi->pm_class = pd->pm_descr.pd_class;
1577
1578 if (p4_pcpu[cpu]->pc_p4pmcs[ri].phw_state & PMC_PHW_FLAG_IS_ENABLED) {
1579 pi->pm_enabled = TRUE;
1580 *ppmc = p4_pcpu[cpu]->pc_p4pmcs[ri].phw_pmc;
1581 } else {
1582 pi->pm_enabled = FALSE;
1583 *ppmc = NULL;
1584 }
1585
1586 return (0);
1587}
1588
1589/*
1590 * Get MSR# for use with RDPMC.
1591 */
1592
1593static int
1594p4_get_msr(int ri, uint32_t *msr)
1595{
1596 KASSERT(ri >= 0 && ri < P4_NPMCS,
1597 ("[p4,%d] ri %d out of range", __LINE__, ri));
1598
1599 *msr = p4_pmcdesc[ri].pm_pmc_msr - P4_PERFCTR_MSR_FIRST;
1600
1601 PMCDBG(MDP,OPS, 1, "ri=%d getmsr=0x%x", ri, *msr);
1602
1603 return 0;
1604}
1605
1606
1607int
1608pmc_p4_initialize(struct pmc_mdep *md, int ncpus)
1609{
1610 struct pmc_classdep *pcd;
1611 struct p4_event_descr *pe;
1612
1613 KASSERT(md != NULL, ("[p4,%d] md is NULL", __LINE__));
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