freebsd-dev/sys/arm64/coresight/coresight_etm4x.c
2020-09-01 21:18:06 +00:00

267 lines
6.8 KiB
C

/*-
* Copyright (c) 2018-2020 Ruslan Bukin <br@bsdpad.com>
* All rights reserved.
*
* This software was developed by BAE Systems, the University of Cambridge
* Computer Laboratory, and Memorial University under DARPA/AFRL contract
* FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent Computing
* (TC) research program.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <machine/bus.h>
#include <arm64/coresight/coresight.h>
#include <arm64/coresight/coresight_etm4x.h>
#include "coresight_if.h"
#define ETM_DEBUG
#undef ETM_DEBUG
#ifdef ETM_DEBUG
#define dprintf(fmt, ...) printf(fmt, ##__VA_ARGS__)
#else
#define dprintf(fmt, ...)
#endif
/*
* Typical trace flow:
*
* CPU0 -> ETM0 -> funnel1 -> funnel0 -> ETF -> replicator -> ETR -> DRAM
* CPU1 -> ETM1 -> funnel1 -^
* CPU2 -> ETM2 -> funnel1 -^
* CPU3 -> ETM3 -> funnel1 -^
*/
static struct resource_spec etm_spec[] = {
{ SYS_RES_MEMORY, 0, RF_ACTIVE },
{ -1, 0 }
};
static int
etm_prepare(device_t dev, struct coresight_event *event)
{
struct etm_softc *sc;
uint32_t reg;
int i;
sc = device_get_softc(dev);
/* Configure ETM */
/*
* Enable the return stack, global timestamping,
* Context ID, and Virtual context identifier tracing.
*/
reg = TRCCONFIGR_RS | TRCCONFIGR_TS;
reg |= TRCCONFIGR_CID | TRCCONFIGR_VMID;
reg |= TRCCONFIGR_INSTP0_LDRSTR;
reg |= TRCCONFIGR_COND_ALL;
bus_write_4(sc->res, TRCCONFIGR, reg);
/* Disable all event tracing. */
bus_write_4(sc->res, TRCEVENTCTL0R, 0);
bus_write_4(sc->res, TRCEVENTCTL1R, 0);
/* Disable stalling, if implemented. */
bus_write_4(sc->res, TRCSTALLCTLR, 0);
/* Enable trace synchronization every 4096 bytes of trace. */
bus_write_4(sc->res, TRCSYNCPR, TRCSYNCPR_4K);
/* Set a value for the trace ID */
bus_write_4(sc->res, TRCTRACEIDR, event->etm.trace_id);
/*
* Disable the timestamp event. The trace unit still generates
* timestamps due to other reasons such as trace synchronization.
*/
bus_write_4(sc->res, TRCTSCTLR, 0);
/*
* Enable ViewInst to trace everything, with the start/stop
* logic started.
*/
reg = TRCVICTLR_SSSTATUS;
/* The number of the single resource used to activate the event. */
reg |= (1 << EVENT_SEL_S);
if (event->excp_level > 2)
return (-1);
reg |= TRCVICTLR_EXLEVEL_NS_M;
reg &= ~TRCVICTLR_EXLEVEL_NS(event->excp_level);
reg |= TRCVICTLR_EXLEVEL_S_M;
reg &= ~TRCVICTLR_EXLEVEL_S(event->excp_level);
bus_write_4(sc->res, TRCVICTLR, reg);
for (i = 0; i < event->naddr * 2; i++) {
dprintf("configure range %d, address %lx\n",
i, event->addr[i]);
bus_write_8(sc->res, TRCACVR(i), event->addr[i]);
reg = 0;
/* Secure state */
reg |= TRCACATR_EXLEVEL_S_M;
reg &= ~TRCACATR_EXLEVEL_S(event->excp_level);
/* Non-secure state */
reg |= TRCACATR_EXLEVEL_NS_M;
reg &= ~TRCACATR_EXLEVEL_NS(event->excp_level);
bus_write_4(sc->res, TRCACATR(i), reg);
/* Address range is included */
reg = bus_read_4(sc->res, TRCVIIECTLR);
reg |= (1 << (TRCVIIECTLR_INCLUDE_S + i / 2));
bus_write_4(sc->res, TRCVIIECTLR, reg);
}
/* No address filtering for ViewData. */
bus_write_4(sc->res, TRCVDARCCTLR, 0);
/* Clear the STATUS bit to zero */
bus_write_4(sc->res, TRCSSCSR(0), 0);
if (event->naddr == 0) {
/* No address range filtering for ViewInst. */
bus_write_4(sc->res, TRCVIIECTLR, 0);
}
/* No start or stop points for ViewInst. */
bus_write_4(sc->res, TRCVISSCTLR, 0);
/* Disable ViewData */
bus_write_4(sc->res, TRCVDCTLR, 0);
/* No address filtering for ViewData. */
bus_write_4(sc->res, TRCVDSACCTLR, 0);
return (0);
}
static int
etm_init(device_t dev)
{
struct etm_softc *sc;
uint32_t reg;
sc = device_get_softc(dev);
/* Unlocking Coresight */
bus_write_4(sc->res, CORESIGHT_LAR, CORESIGHT_UNLOCK);
/* Unlocking ETM */
bus_write_4(sc->res, TRCOSLAR, 0);
reg = bus_read_4(sc->res, TRCIDR(1));
dprintf("ETM Version: %d.%d\n",
(reg & TRCIDR1_TRCARCHMAJ_M) >> TRCIDR1_TRCARCHMAJ_S,
(reg & TRCIDR1_TRCARCHMIN_M) >> TRCIDR1_TRCARCHMIN_S);
return (0);
}
static int
etm_enable(device_t dev, struct endpoint *endp,
struct coresight_event *event)
{
struct etm_softc *sc;
uint32_t reg;
sc = device_get_softc(dev);
etm_prepare(dev, event);
/* Enable the trace unit */
bus_write_4(sc->res, TRCPRGCTLR, TRCPRGCTLR_EN);
/* Wait for an IDLE bit to be LOW */
do {
reg = bus_read_4(sc->res, TRCSTATR);
} while ((reg & TRCSTATR_IDLE) == 1);
if ((bus_read_4(sc->res, TRCPRGCTLR) & TRCPRGCTLR_EN) == 0)
panic("etm is not enabled\n");
return (0);
}
static void
etm_disable(device_t dev, struct endpoint *endp,
struct coresight_event *event)
{
struct etm_softc *sc;
uint32_t reg;
sc = device_get_softc(dev);
/* Disable the trace unit */
bus_write_4(sc->res, TRCPRGCTLR, 0);
/* Wait for an IDLE bit */
do {
reg = bus_read_4(sc->res, TRCSTATR);
} while ((reg & TRCSTATR_IDLE) == 0);
}
int
etm_attach(device_t dev)
{
struct coresight_desc desc;
struct etm_softc *sc;
sc = device_get_softc(dev);
if (bus_alloc_resources(dev, etm_spec, &sc->res) != 0) {
device_printf(dev, "cannot allocate resources for device\n");
return (ENXIO);
}
desc.pdata = sc->pdata;
desc.dev = dev;
desc.dev_type = CORESIGHT_ETMV4;
coresight_register(&desc);
return (0);
}
static device_method_t etm_methods[] = {
/* Coresight interface */
DEVMETHOD(coresight_init, etm_init),
DEVMETHOD(coresight_enable, etm_enable),
DEVMETHOD(coresight_disable, etm_disable),
DEVMETHOD_END
};
DEFINE_CLASS_0(etm, etm_driver, etm_methods, sizeof(struct etm_softc));