arch/powerpc/perf/power8-pmu.c

Source file repositories/reference/linux-study-clean/arch/powerpc/perf/power8-pmu.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/perf/power8-pmu.c
Extension
.c
Size
11831 bytes
Lines
412
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Performance counter support for POWER8 processors.
 *
 * Copyright 2009 Paul Mackerras, IBM Corporation.
 * Copyright 2013 Michael Ellerman, IBM Corporation.
 */

#define pr_fmt(fmt)	"power8-pmu: " fmt

#include "isa207-common.h"

/*
 * Some power8 event codes.
 */
#define EVENT(_name, _code)	_name = _code,

enum {
#include "power8-events-list.h"
};

#undef EVENT

/* MMCRA IFM bits - POWER8 */
#define	POWER8_MMCRA_IFM1		0x0000000040000000UL
#define	POWER8_MMCRA_IFM2		0x0000000080000000UL
#define	POWER8_MMCRA_IFM3		0x00000000C0000000UL
#define	POWER8_MMCRA_BHRB_MASK		0x00000000C0000000UL

/*
 * Raw event encoding for PowerISA v2.07 (Power8):
 *
 *        60        56        52        48        44        40        36        32
 * | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - |
 *   | | [ ]                           [      thresh_cmp     ]   [  thresh_ctl   ]
 *   | |  |                                                              |
 *   | |  *- IFM (Linux)                 thresh start/stop OR FAB match -*
 *   | *- BHRB (Linux)
 *   *- EBB (Linux)
 *
 *        28        24        20        16        12         8         4         0
 * | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - |
 *   [   ] [  sample ]   [cache]   [ pmc ]   [unit ]   c     m   [    pmcxsel    ]
 *     |        |           |                          |     |
 *     |        |           |                          |     *- mark
 *     |        |           *- L1/L2/L3 cache_sel      |
 *     |        |                                      |
 *     |        *- sampling mode for marked events     *- combine
 *     |
 *     *- thresh_sel
 *
 * Below uses IBM bit numbering.
 *
 * MMCR1[x:y] = unit    (PMCxUNIT)
 * MMCR1[x]   = combine (PMCxCOMB)
 *
 * if pmc == 3 and unit == 0 and pmcxsel[0:6] == 0b0101011
 *	# PM_MRK_FAB_RSP_MATCH
 *	MMCR1[20:27] = thresh_ctl   (FAB_CRESP_MATCH / FAB_TYPE_MATCH)
 * else if pmc == 4 and unit == 0xf and pmcxsel[0:6] == 0b0101001
 *	# PM_MRK_FAB_RSP_MATCH_CYC
 *	MMCR1[20:27] = thresh_ctl   (FAB_CRESP_MATCH / FAB_TYPE_MATCH)
 * else
 *	MMCRA[48:55] = thresh_ctl   (THRESH START/END)
 *
 * if thresh_sel:
 *	MMCRA[45:47] = thresh_sel
 *
 * if thresh_cmp:
 *	MMCRA[22:24] = thresh_cmp[0:2]
 *	MMCRA[25:31] = thresh_cmp[3:9]
 *
 * if unit == 6 or unit == 7
 *	MMCRC[53:55] = cache_sel[1:3]      (L2EVENT_SEL)
 * else if unit == 8 or unit == 9:
 *	if cache_sel[0] == 0: # L3 bank
 *		MMCRC[47:49] = cache_sel[1:3]  (L3EVENT_SEL0)
 *	else if cache_sel[0] == 1:
 *		MMCRC[50:51] = cache_sel[2:3]  (L3EVENT_SEL1)
 * else if cache_sel[1]: # L1 event
 *	MMCR1[16] = cache_sel[2]
 *	MMCR1[17] = cache_sel[3]
 *
 * if mark:
 *	MMCRA[63]    = 1		(SAMPLE_ENABLE)
 *	MMCRA[57:59] = sample[0:2]	(RAND_SAMP_ELIG)
 *	MMCRA[61:62] = sample[3:4]	(RAND_SAMP_MODE)
 *
 * if EBB and BHRB:
 *	MMCRA[32:33] = IFM

Annotation

Implementation Notes