a39f841a5b
In the current driver for Coresight components, two features of PTM components are missing: 1. Branch Broadcasting (present also in ETM but called Branch Output) 2. Return Stack (only present in PTM v1.0 and PTMv1.1) These features can be added simply to the code using `mode` field of `etm_config` struct. 1. **Branch Broadcast** : The branch broadcast feature is present in ETM components as well and is called Branch output. It allows to retrieve addresses for direct branch addresses alongside the indirect branch addresses. For example, it could be useful in cases when tracing without source code. 2. **Return Stack** : The return stack option allows to retrieve the return addresses of function calls. It can be useful to avoid CRA (Code Reuse Attacks) by keeping a shadowstack. Signed-off-by: Muhammad Abdul Wahab <muhammadabdul.wahab@centralesupelec.fr> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
302 lines
9.4 KiB
C
302 lines
9.4 KiB
C
/* Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _CORESIGHT_CORESIGHT_ETM_H
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#define _CORESIGHT_CORESIGHT_ETM_H
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#include <asm/local.h>
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#include <linux/spinlock.h>
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#include "coresight-priv.h"
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/*
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* Device registers:
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* 0x000 - 0x2FC: Trace registers
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* 0x300 - 0x314: Management registers
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* 0x318 - 0xEFC: Trace registers
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*
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* Coresight registers
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* 0xF00 - 0xF9C: Management registers
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* 0xFA0 - 0xFA4: Management registers in PFTv1.0
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* Trace registers in PFTv1.1
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* 0xFA8 - 0xFFC: Management registers
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*/
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/* Trace registers (0x000-0x2FC) */
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#define ETMCR 0x000
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#define ETMCCR 0x004
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#define ETMTRIGGER 0x008
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#define ETMSR 0x010
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#define ETMSCR 0x014
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#define ETMTSSCR 0x018
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#define ETMTECR2 0x01c
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#define ETMTEEVR 0x020
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#define ETMTECR1 0x024
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#define ETMFFLR 0x02c
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#define ETMACVRn(n) (0x040 + (n * 4))
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#define ETMACTRn(n) (0x080 + (n * 4))
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#define ETMCNTRLDVRn(n) (0x140 + (n * 4))
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#define ETMCNTENRn(n) (0x150 + (n * 4))
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#define ETMCNTRLDEVRn(n) (0x160 + (n * 4))
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#define ETMCNTVRn(n) (0x170 + (n * 4))
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#define ETMSQ12EVR 0x180
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#define ETMSQ21EVR 0x184
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#define ETMSQ23EVR 0x188
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#define ETMSQ31EVR 0x18c
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#define ETMSQ32EVR 0x190
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#define ETMSQ13EVR 0x194
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#define ETMSQR 0x19c
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#define ETMEXTOUTEVRn(n) (0x1a0 + (n * 4))
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#define ETMCIDCVRn(n) (0x1b0 + (n * 4))
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#define ETMCIDCMR 0x1bc
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#define ETMIMPSPEC0 0x1c0
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#define ETMIMPSPEC1 0x1c4
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#define ETMIMPSPEC2 0x1c8
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#define ETMIMPSPEC3 0x1cc
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#define ETMIMPSPEC4 0x1d0
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#define ETMIMPSPEC5 0x1d4
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#define ETMIMPSPEC6 0x1d8
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#define ETMIMPSPEC7 0x1dc
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#define ETMSYNCFR 0x1e0
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#define ETMIDR 0x1e4
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#define ETMCCER 0x1e8
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#define ETMEXTINSELR 0x1ec
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#define ETMTESSEICR 0x1f0
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#define ETMEIBCR 0x1f4
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#define ETMTSEVR 0x1f8
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#define ETMAUXCR 0x1fc
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#define ETMTRACEIDR 0x200
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#define ETMVMIDCVR 0x240
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/* Management registers (0x300-0x314) */
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#define ETMOSLAR 0x300
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#define ETMOSLSR 0x304
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#define ETMOSSRR 0x308
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#define ETMPDCR 0x310
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#define ETMPDSR 0x314
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#define ETM_MAX_ADDR_CMP 16
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#define ETM_MAX_CNTR 4
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#define ETM_MAX_CTXID_CMP 3
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/* Register definition */
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/* ETMCR - 0x00 */
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#define ETMCR_PWD_DWN BIT(0)
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#define ETMCR_STALL_MODE BIT(7)
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#define ETMCR_BRANCH_BROADCAST BIT(8)
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#define ETMCR_ETM_PRG BIT(10)
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#define ETMCR_ETM_EN BIT(11)
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#define ETMCR_CYC_ACC BIT(12)
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#define ETMCR_CTXID_SIZE (BIT(14)|BIT(15))
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#define ETMCR_TIMESTAMP_EN BIT(28)
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#define ETMCR_RETURN_STACK BIT(29)
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/* ETMCCR - 0x04 */
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#define ETMCCR_FIFOFULL BIT(23)
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/* ETMPDCR - 0x310 */
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#define ETMPDCR_PWD_UP BIT(3)
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/* ETMTECR1 - 0x024 */
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#define ETMTECR1_ADDR_COMP_1 BIT(0)
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#define ETMTECR1_INC_EXC BIT(24)
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#define ETMTECR1_START_STOP BIT(25)
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/* ETMCCER - 0x1E8 */
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#define ETMCCER_TIMESTAMP BIT(22)
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#define ETM_MODE_EXCLUDE BIT(0)
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#define ETM_MODE_CYCACC BIT(1)
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#define ETM_MODE_STALL BIT(2)
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#define ETM_MODE_TIMESTAMP BIT(3)
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#define ETM_MODE_CTXID BIT(4)
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#define ETM_MODE_BBROAD BIT(5)
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#define ETM_MODE_RET_STACK BIT(6)
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#define ETM_MODE_ALL (ETM_MODE_EXCLUDE | ETM_MODE_CYCACC | \
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ETM_MODE_STALL | ETM_MODE_TIMESTAMP | \
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ETM_MODE_BBROAD | ETM_MODE_RET_STACK | \
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ETM_MODE_CTXID | ETM_MODE_EXCL_KERN | \
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ETM_MODE_EXCL_USER)
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#define ETM_SQR_MASK 0x3
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#define ETM_TRACEID_MASK 0x3f
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#define ETM_EVENT_MASK 0x1ffff
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#define ETM_SYNC_MASK 0xfff
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#define ETM_ALL_MASK 0xffffffff
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#define ETMSR_PROG_BIT 1
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#define ETM_SEQ_STATE_MAX_VAL (0x2)
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#define PORT_SIZE_MASK (GENMASK(21, 21) | GENMASK(6, 4))
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#define ETM_HARD_WIRE_RES_A /* Hard wired, always true */ \
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((0x0f << 0) | \
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/* Resource index A */ \
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(0x06 << 4))
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#define ETM_ADD_COMP_0 /* Single addr comparator 1 */ \
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((0x00 << 7) | \
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/* Resource index B */ \
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(0x00 << 11))
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#define ETM_EVENT_NOT_A BIT(14) /* NOT(A) */
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#define ETM_DEFAULT_EVENT_VAL (ETM_HARD_WIRE_RES_A | \
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ETM_ADD_COMP_0 | \
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ETM_EVENT_NOT_A)
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/**
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* struct etm_config - configuration information related to an ETM
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* @mode: controls various modes supported by this ETM/PTM.
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* @ctrl: used in conjunction with @mode.
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* @trigger_event: setting for register ETMTRIGGER.
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* @startstop_ctrl: setting for register ETMTSSCR.
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* @enable_event: setting for register ETMTEEVR.
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* @enable_ctrl1: setting for register ETMTECR1.
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* @enable_ctrl2: setting for register ETMTECR2.
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* @fifofull_level: setting for register ETMFFLR.
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* @addr_idx: index for the address comparator selection.
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* @addr_val: value for address comparator register.
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* @addr_acctype: access type for address comparator register.
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* @addr_type: current status of the comparator register.
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* @cntr_idx: index for the counter register selection.
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* @cntr_rld_val: reload value of a counter register.
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* @cntr_event: control for counter enable register.
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* @cntr_rld_event: value for counter reload event register.
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* @cntr_val: counter value register.
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* @seq_12_event: event causing the transition from 1 to 2.
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* @seq_21_event: event causing the transition from 2 to 1.
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* @seq_23_event: event causing the transition from 2 to 3.
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* @seq_31_event: event causing the transition from 3 to 1.
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* @seq_32_event: event causing the transition from 3 to 2.
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* @seq_13_event: event causing the transition from 1 to 3.
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* @seq_curr_state: current value of the sequencer register.
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* @ctxid_idx: index for the context ID registers.
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* @ctxid_pid: value for the context ID to trigger on.
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* @ctxid_vpid: Virtual PID seen by users if PID namespace is enabled, otherwise
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* the same value of ctxid_pid.
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* @ctxid_mask: mask applicable to all the context IDs.
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* @sync_freq: Synchronisation frequency.
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* @timestamp_event: Defines an event that requests the insertion
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* of a timestamp into the trace stream.
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*/
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struct etm_config {
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u32 mode;
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u32 ctrl;
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u32 trigger_event;
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u32 startstop_ctrl;
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u32 enable_event;
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u32 enable_ctrl1;
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u32 enable_ctrl2;
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u32 fifofull_level;
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u8 addr_idx;
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u32 addr_val[ETM_MAX_ADDR_CMP];
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u32 addr_acctype[ETM_MAX_ADDR_CMP];
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u32 addr_type[ETM_MAX_ADDR_CMP];
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u8 cntr_idx;
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u32 cntr_rld_val[ETM_MAX_CNTR];
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u32 cntr_event[ETM_MAX_CNTR];
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u32 cntr_rld_event[ETM_MAX_CNTR];
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u32 cntr_val[ETM_MAX_CNTR];
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u32 seq_12_event;
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u32 seq_21_event;
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u32 seq_23_event;
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u32 seq_31_event;
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u32 seq_32_event;
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u32 seq_13_event;
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u32 seq_curr_state;
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u8 ctxid_idx;
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u32 ctxid_pid[ETM_MAX_CTXID_CMP];
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u32 ctxid_vpid[ETM_MAX_CTXID_CMP];
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u32 ctxid_mask;
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u32 sync_freq;
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u32 timestamp_event;
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};
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/**
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* struct etm_drvdata - specifics associated to an ETM component
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* @base: memory mapped base address for this component.
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* @dev: the device entity associated to this component.
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* @atclk: optional clock for the core parts of the ETM.
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* @csdev: component vitals needed by the framework.
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* @spinlock: only one at a time pls.
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* @cpu: the cpu this component is affined to.
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* @port_size: port size as reported by ETMCR bit 4-6 and 21.
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* @arch: ETM/PTM version number.
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* @use_cpu14: true if management registers need to be accessed via CP14.
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* @mode: this tracer's mode, i.e sysFS, Perf or disabled.
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* @sticky_enable: true if ETM base configuration has been done.
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* @boot_enable:true if we should start tracing at boot time.
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* @os_unlock: true if access to management registers is allowed.
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* @nr_addr_cmp:Number of pairs of address comparators as found in ETMCCR.
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* @nr_cntr: Number of counters as found in ETMCCR bit 13-15.
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* @nr_ext_inp: Number of external input as found in ETMCCR bit 17-19.
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* @nr_ext_out: Number of external output as found in ETMCCR bit 20-22.
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* @nr_ctxid_cmp: Number of contextID comparators as found in ETMCCR bit 24-25.
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* @etmccr: value of register ETMCCR.
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* @etmccer: value of register ETMCCER.
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* @traceid: value of the current ID for this component.
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* @config: structure holding configuration parameters.
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*/
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struct etm_drvdata {
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void __iomem *base;
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struct device *dev;
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struct clk *atclk;
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struct coresight_device *csdev;
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spinlock_t spinlock;
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int cpu;
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int port_size;
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u8 arch;
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bool use_cp14;
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local_t mode;
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bool sticky_enable;
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bool boot_enable;
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bool os_unlock;
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u8 nr_addr_cmp;
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u8 nr_cntr;
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u8 nr_ext_inp;
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u8 nr_ext_out;
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u8 nr_ctxid_cmp;
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u32 etmccr;
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u32 etmccer;
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u32 traceid;
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struct etm_config config;
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};
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static inline void etm_writel(struct etm_drvdata *drvdata,
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u32 val, u32 off)
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{
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if (drvdata->use_cp14) {
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if (etm_writel_cp14(off, val)) {
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dev_err(drvdata->dev,
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"invalid CP14 access to ETM reg: %#x", off);
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}
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} else {
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writel_relaxed(val, drvdata->base + off);
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}
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}
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static inline unsigned int etm_readl(struct etm_drvdata *drvdata, u32 off)
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{
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u32 val;
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if (drvdata->use_cp14) {
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if (etm_readl_cp14(off, &val)) {
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dev_err(drvdata->dev,
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"invalid CP14 access to ETM reg: %#x", off);
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}
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} else {
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val = readl_relaxed(drvdata->base + off);
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}
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return val;
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}
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extern const struct attribute_group *coresight_etm_groups[];
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int etm_get_trace_id(struct etm_drvdata *drvdata);
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void etm_set_default(struct etm_config *config);
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void etm_config_trace_mode(struct etm_config *config);
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struct etm_config *get_etm_config(struct etm_drvdata *drvdata);
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#endif
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