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82d2c16b35
Thresholding, a performance monitoring unit feature, can be
used to identify marked instructions which take more than
expected cycles between start event and end event.
Threshold compare (thresh_cmp) bits are programmed in MMCRA
register. In Power9, thresh_cmp bits were part of the
event code. But in case of P10, thresh_cmp are not part of
event code due to inclusion of MMCR3 bits.
Patch here adds an option to use attr.config1 variable
to be used to pass thresh_cmp value to be programmed in
MMCRA register. A new ppmu flag called PPMU_HAS_ATTR_CONFIG1
has been added and this flag is used to notify the use of
attr.config1 variable.
Patch has extended the parameter list of 'compute_mmcr',
to include power_pmu's 'flags' element and parameter list of
get_constraint to include attr.config1 value. It also extend
parameter list of power_check_constraints inorder to pass
perf_event list.
As stated by commit ef0e3b650f ("powerpc/perf: Fix Threshold
Event Counter Multiplier width for P10"), constraint bits for
thresh_cmp is also needed to be increased to 11 bits, which is
handled as part of this patch. We added bit number 53 as part
of constraint bits of thresh_cmp for power10 to make it an
11 bit field.
Updated layout for p10:
/*
* Layout of constraint bits:
*
* 60 56 52 48 44 40 36 32
* | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - |
* [ fab_match ] [ thresh_cmp ] [ thresh_ctl ] [ ]
* | |
* [ thresh_cmp bits for p10] thresh_sel -*
*
* 28 24 20 16 12 8 4 0
* | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - |
* [ ] | [ ] | [ sample ] [ ] [6] [5] [4] [3] [2] [1]
* | | | | |
* BHRB IFM -* | | |*radix_scope | Count of events for each PMC.
* EBB -* | | p1, p2, p3, p4, p5, p6.
* L1 I/D qualifier -* |
* nc - number of counters -*
*
* The PMC fields P1..P6, and NC, are adder fields. As we accumulate constraints
* we want the low bit of each field to be added to any existing value.
*
* Everything else is a value field.
*/
Result:
command#: cat /sys/devices/cpu/format/thresh_cmp
config1:0-17
ex. usage:
command#: perf record -I --weight -d -e
cpu/event=0x67340101EC,thresh_cmp=500/ ./ebizzy -S 2 -t 1 -s 4096
1826636 records/s
real 2.00 s
user 2.00 s
sys 0.00 s
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.038 MB perf.data (61 samples) ]
Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210209095234.837356-1-kjain@linux.ibm.com
428 lines
10 KiB
C
428 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Performance counter support for MPC7450-family processors.
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*
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* Copyright 2008-2009 Paul Mackerras, IBM Corporation.
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*/
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#include <linux/string.h>
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#include <linux/perf_event.h>
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#include <asm/reg.h>
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#include <asm/cputable.h>
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#define N_COUNTER 6 /* Number of hardware counters */
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#define MAX_ALT 3 /* Maximum number of event alternative codes */
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/*
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* Bits in event code for MPC7450 family
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*/
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#define PM_THRMULT_MSKS 0x40000
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#define PM_THRESH_SH 12
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#define PM_THRESH_MSK 0x3f
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#define PM_PMC_SH 8
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#define PM_PMC_MSK 7
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#define PM_PMCSEL_MSK 0x7f
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/*
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* Classify events according to how specific their PMC requirements are.
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* Result is:
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* 0: can go on any PMC
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* 1: can go on PMCs 1-4
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* 2: can go on PMCs 1,2,4
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* 3: can go on PMCs 1 or 2
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* 4: can only go on one PMC
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* -1: event code is invalid
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*/
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#define N_CLASSES 5
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static int mpc7450_classify_event(u32 event)
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{
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int pmc;
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pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
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if (pmc) {
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if (pmc > N_COUNTER)
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return -1;
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return 4;
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}
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event &= PM_PMCSEL_MSK;
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if (event <= 1)
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return 0;
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if (event <= 7)
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return 1;
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if (event <= 13)
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return 2;
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if (event <= 22)
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return 3;
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return -1;
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}
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/*
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* Events using threshold and possible threshold scale:
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* code scale? name
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* 11e N PM_INSTQ_EXCEED_CYC
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* 11f N PM_ALTV_IQ_EXCEED_CYC
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* 128 Y PM_DTLB_SEARCH_EXCEED_CYC
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* 12b Y PM_LD_MISS_EXCEED_L1_CYC
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* 220 N PM_CQ_EXCEED_CYC
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* 30c N PM_GPR_RB_EXCEED_CYC
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* 30d ? PM_FPR_IQ_EXCEED_CYC ?
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* 311 Y PM_ITLB_SEARCH_EXCEED
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* 410 N PM_GPR_IQ_EXCEED_CYC
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*/
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/*
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* Return use of threshold and threshold scale bits:
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* 0 = uses neither, 1 = uses threshold, 2 = uses both
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*/
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static int mpc7450_threshold_use(u32 event)
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{
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int pmc, sel;
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pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
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sel = event & PM_PMCSEL_MSK;
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switch (pmc) {
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case 1:
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if (sel == 0x1e || sel == 0x1f)
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return 1;
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if (sel == 0x28 || sel == 0x2b)
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return 2;
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break;
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case 2:
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if (sel == 0x20)
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return 1;
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break;
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case 3:
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if (sel == 0xc || sel == 0xd)
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return 1;
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if (sel == 0x11)
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return 2;
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break;
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case 4:
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if (sel == 0x10)
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return 1;
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break;
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}
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return 0;
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}
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/*
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* Layout of constraint bits:
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* 33222222222211111111110000000000
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* 10987654321098765432109876543210
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* |< >< > < > < ><><><><><><>
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* TS TV G4 G3 G2P6P5P4P3P2P1
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*
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* P1 - P6
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* 0 - 11: Count of events needing PMC1 .. PMC6
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*
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* G2
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* 12 - 14: Count of events needing PMC1 or PMC2
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*
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* G3
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* 16 - 18: Count of events needing PMC1, PMC2 or PMC4
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*
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* G4
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* 20 - 23: Count of events needing PMC1, PMC2, PMC3 or PMC4
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*
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* TV
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* 24 - 29: Threshold value requested
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*
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* TS
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* 30: Threshold scale value requested
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*/
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static u32 pmcbits[N_COUNTER][2] = {
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{ 0x00844002, 0x00111001 }, /* PMC1 mask, value: P1,G2,G3,G4 */
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{ 0x00844008, 0x00111004 }, /* PMC2: P2,G2,G3,G4 */
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{ 0x00800020, 0x00100010 }, /* PMC3: P3,G4 */
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{ 0x00840080, 0x00110040 }, /* PMC4: P4,G3,G4 */
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{ 0x00000200, 0x00000100 }, /* PMC5: P5 */
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{ 0x00000800, 0x00000400 } /* PMC6: P6 */
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};
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static u32 classbits[N_CLASSES - 1][2] = {
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{ 0x00000000, 0x00000000 }, /* class 0: no constraint */
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{ 0x00800000, 0x00100000 }, /* class 1: G4 */
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{ 0x00040000, 0x00010000 }, /* class 2: G3 */
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{ 0x00004000, 0x00001000 }, /* class 3: G2 */
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};
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static int mpc7450_get_constraint(u64 event, unsigned long *maskp,
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unsigned long *valp, u64 event_config1 __maybe_unused)
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{
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int pmc, class;
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u32 mask, value;
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int thresh, tuse;
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class = mpc7450_classify_event(event);
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if (class < 0)
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return -1;
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if (class == 4) {
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pmc = ((unsigned int)event >> PM_PMC_SH) & PM_PMC_MSK;
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mask = pmcbits[pmc - 1][0];
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value = pmcbits[pmc - 1][1];
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} else {
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mask = classbits[class][0];
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value = classbits[class][1];
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}
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tuse = mpc7450_threshold_use(event);
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if (tuse) {
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thresh = ((unsigned int)event >> PM_THRESH_SH) & PM_THRESH_MSK;
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mask |= 0x3f << 24;
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value |= thresh << 24;
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if (tuse == 2) {
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mask |= 0x40000000;
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if ((unsigned int)event & PM_THRMULT_MSKS)
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value |= 0x40000000;
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}
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}
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*maskp = mask;
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*valp = value;
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return 0;
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}
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static const unsigned int event_alternatives[][MAX_ALT] = {
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{ 0x217, 0x317 }, /* PM_L1_DCACHE_MISS */
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{ 0x418, 0x50f, 0x60f }, /* PM_SNOOP_RETRY */
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{ 0x502, 0x602 }, /* PM_L2_HIT */
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{ 0x503, 0x603 }, /* PM_L3_HIT */
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{ 0x504, 0x604 }, /* PM_L2_ICACHE_MISS */
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{ 0x505, 0x605 }, /* PM_L3_ICACHE_MISS */
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{ 0x506, 0x606 }, /* PM_L2_DCACHE_MISS */
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{ 0x507, 0x607 }, /* PM_L3_DCACHE_MISS */
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{ 0x50a, 0x623 }, /* PM_LD_HIT_L3 */
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{ 0x50b, 0x624 }, /* PM_ST_HIT_L3 */
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{ 0x50d, 0x60d }, /* PM_L2_TOUCH_HIT */
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{ 0x50e, 0x60e }, /* PM_L3_TOUCH_HIT */
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{ 0x512, 0x612 }, /* PM_INT_LOCAL */
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{ 0x513, 0x61d }, /* PM_L2_MISS */
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{ 0x514, 0x61e }, /* PM_L3_MISS */
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};
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/*
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* Scan the alternatives table for a match and return the
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* index into the alternatives table if found, else -1.
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*/
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static int find_alternative(u32 event)
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{
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int i, j;
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for (i = 0; i < ARRAY_SIZE(event_alternatives); ++i) {
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if (event < event_alternatives[i][0])
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break;
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for (j = 0; j < MAX_ALT && event_alternatives[i][j]; ++j)
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if (event == event_alternatives[i][j])
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return i;
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}
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return -1;
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}
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static int mpc7450_get_alternatives(u64 event, unsigned int flags, u64 alt[])
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{
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int i, j, nalt = 1;
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u32 ae;
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alt[0] = event;
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nalt = 1;
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i = find_alternative((u32)event);
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if (i >= 0) {
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for (j = 0; j < MAX_ALT; ++j) {
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ae = event_alternatives[i][j];
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if (ae && ae != (u32)event)
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alt[nalt++] = ae;
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}
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}
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return nalt;
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}
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/*
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* Bitmaps of which PMCs each class can use for classes 0 - 3.
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* Bit i is set if PMC i+1 is usable.
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*/
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static const u8 classmap[N_CLASSES] = {
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0x3f, 0x0f, 0x0b, 0x03, 0
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};
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/* Bit position and width of each PMCSEL field */
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static const int pmcsel_shift[N_COUNTER] = {
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6, 0, 27, 22, 17, 11
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};
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static const u32 pmcsel_mask[N_COUNTER] = {
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0x7f, 0x3f, 0x1f, 0x1f, 0x1f, 0x3f
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};
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/*
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* Compute MMCR0/1/2 values for a set of events.
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*/
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static int mpc7450_compute_mmcr(u64 event[], int n_ev, unsigned int hwc[],
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struct mmcr_regs *mmcr,
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struct perf_event *pevents[],
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u32 flags __maybe_unused)
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{
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u8 event_index[N_CLASSES][N_COUNTER];
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int n_classevent[N_CLASSES];
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int i, j, class, tuse;
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u32 pmc_inuse = 0, pmc_avail;
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u32 mmcr0 = 0, mmcr1 = 0, mmcr2 = 0;
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u32 ev, pmc, thresh;
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if (n_ev > N_COUNTER)
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return -1;
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/* First pass: count usage in each class */
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for (i = 0; i < N_CLASSES; ++i)
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n_classevent[i] = 0;
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for (i = 0; i < n_ev; ++i) {
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class = mpc7450_classify_event(event[i]);
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if (class < 0)
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return -1;
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j = n_classevent[class]++;
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event_index[class][j] = i;
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}
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/* Second pass: allocate PMCs from most specific event to least */
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for (class = N_CLASSES - 1; class >= 0; --class) {
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for (i = 0; i < n_classevent[class]; ++i) {
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ev = event[event_index[class][i]];
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if (class == 4) {
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pmc = (ev >> PM_PMC_SH) & PM_PMC_MSK;
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if (pmc_inuse & (1 << (pmc - 1)))
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return -1;
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} else {
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/* Find a suitable PMC */
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pmc_avail = classmap[class] & ~pmc_inuse;
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if (!pmc_avail)
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return -1;
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pmc = ffs(pmc_avail);
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}
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pmc_inuse |= 1 << (pmc - 1);
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tuse = mpc7450_threshold_use(ev);
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if (tuse) {
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thresh = (ev >> PM_THRESH_SH) & PM_THRESH_MSK;
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mmcr0 |= thresh << 16;
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if (tuse == 2 && (ev & PM_THRMULT_MSKS))
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mmcr2 = 0x80000000;
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}
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ev &= pmcsel_mask[pmc - 1];
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ev <<= pmcsel_shift[pmc - 1];
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if (pmc <= 2)
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mmcr0 |= ev;
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else
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mmcr1 |= ev;
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hwc[event_index[class][i]] = pmc - 1;
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}
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}
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if (pmc_inuse & 1)
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mmcr0 |= MMCR0_PMC1CE;
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if (pmc_inuse & 0x3e)
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mmcr0 |= MMCR0_PMCnCE;
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/* Return MMCRx values */
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mmcr->mmcr0 = mmcr0;
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mmcr->mmcr1 = mmcr1;
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mmcr->mmcr2 = mmcr2;
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/*
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* 32-bit doesn't have an MMCRA and uses SPRN_MMCR2 to define
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* SPRN_MMCRA. So assign mmcra of cpu_hw_events with `mmcr2`
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* value to ensure that any write to this SPRN_MMCRA will
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* use mmcr2 value.
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*/
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mmcr->mmcra = mmcr2;
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return 0;
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}
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/*
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* Disable counting by a PMC.
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* Note that the pmc argument is 0-based here, not 1-based.
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*/
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static void mpc7450_disable_pmc(unsigned int pmc, struct mmcr_regs *mmcr)
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{
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if (pmc <= 1)
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mmcr->mmcr0 &= ~(pmcsel_mask[pmc] << pmcsel_shift[pmc]);
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else
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mmcr->mmcr1 &= ~(pmcsel_mask[pmc] << pmcsel_shift[pmc]);
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}
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static int mpc7450_generic_events[] = {
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[PERF_COUNT_HW_CPU_CYCLES] = 1,
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[PERF_COUNT_HW_INSTRUCTIONS] = 2,
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[PERF_COUNT_HW_CACHE_MISSES] = 0x217, /* PM_L1_DCACHE_MISS */
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[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x122, /* PM_BR_CMPL */
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[PERF_COUNT_HW_BRANCH_MISSES] = 0x41c, /* PM_BR_MPRED */
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};
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#define C(x) PERF_COUNT_HW_CACHE_##x
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/*
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* Table of generalized cache-related events.
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* 0 means not supported, -1 means nonsensical, other values
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* are event codes.
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*/
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static u64 mpc7450_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
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[C(L1D)] = { /* RESULT_ACCESS RESULT_MISS */
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[C(OP_READ)] = { 0, 0x225 },
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[C(OP_WRITE)] = { 0, 0x227 },
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[C(OP_PREFETCH)] = { 0, 0 },
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},
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[C(L1I)] = { /* RESULT_ACCESS RESULT_MISS */
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[C(OP_READ)] = { 0x129, 0x115 },
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[C(OP_WRITE)] = { -1, -1 },
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[C(OP_PREFETCH)] = { 0x634, 0 },
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},
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[C(LL)] = { /* RESULT_ACCESS RESULT_MISS */
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[C(OP_READ)] = { 0, 0 },
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[C(OP_WRITE)] = { 0, 0 },
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[C(OP_PREFETCH)] = { 0, 0 },
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},
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[C(DTLB)] = { /* RESULT_ACCESS RESULT_MISS */
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[C(OP_READ)] = { 0, 0x312 },
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[C(OP_WRITE)] = { -1, -1 },
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[C(OP_PREFETCH)] = { -1, -1 },
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},
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[C(ITLB)] = { /* RESULT_ACCESS RESULT_MISS */
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[C(OP_READ)] = { 0, 0x223 },
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[C(OP_WRITE)] = { -1, -1 },
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[C(OP_PREFETCH)] = { -1, -1 },
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},
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[C(BPU)] = { /* RESULT_ACCESS RESULT_MISS */
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[C(OP_READ)] = { 0x122, 0x41c },
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[C(OP_WRITE)] = { -1, -1 },
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[C(OP_PREFETCH)] = { -1, -1 },
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},
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[C(NODE)] = { /* RESULT_ACCESS RESULT_MISS */
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[C(OP_READ)] = { -1, -1 },
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[C(OP_WRITE)] = { -1, -1 },
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[C(OP_PREFETCH)] = { -1, -1 },
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},
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};
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struct power_pmu mpc7450_pmu = {
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.name = "MPC7450 family",
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.n_counter = N_COUNTER,
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.max_alternatives = MAX_ALT,
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.add_fields = 0x00111555ul,
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.test_adder = 0x00301000ul,
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.compute_mmcr = mpc7450_compute_mmcr,
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.get_constraint = mpc7450_get_constraint,
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.get_alternatives = mpc7450_get_alternatives,
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.disable_pmc = mpc7450_disable_pmc,
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.n_generic = ARRAY_SIZE(mpc7450_generic_events),
|
|
.generic_events = mpc7450_generic_events,
|
|
.cache_events = &mpc7450_cache_events,
|
|
};
|
|
|
|
static int __init init_mpc7450_pmu(void)
|
|
{
|
|
if (!cur_cpu_spec->oprofile_cpu_type ||
|
|
strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc/7450"))
|
|
return -ENODEV;
|
|
|
|
return register_power_pmu(&mpc7450_pmu);
|
|
}
|
|
|
|
early_initcall(init_mpc7450_pmu);
|