Commit 194cbc49 authored by Peter Maydell's avatar Peter Maydell

target-arm: Add trace events for the generic timers

Add some useful trace events for the ARM generic timers (notably
the various register writes and the resulting IRQ line state).
Signed-off-by: 's avatarPeter Maydell <peter.maydell@linaro.org>
Reviewed-by: 's avatarEdgar E. Iglesias <edgar.iglesias@xilinx.com>
Message-id: 1476294876-12340-3-git-send-email-peter.maydell@linaro.org
parent 5dbdc434
......@@ -155,6 +155,7 @@ trace-events-y += hw/alpha/trace-events
trace-events-y += ui/trace-events
trace-events-y += audio/trace-events
trace-events-y += net/trace-events
trace-events-y += target-arm/trace-events
trace-events-y += target-i386/trace-events
trace-events-y += target-sparc/trace-events
trace-events-y += target-s390x/trace-events
......
#include "qemu/osdep.h"
#include "trace.h"
#include "cpu.h"
#include "internals.h"
#include "exec/gdbstub.h"
......@@ -1560,10 +1561,13 @@ static void gt_recalc_timer(ARMCPU *cpu, int timeridx)
/* Note that this must be unsigned 64 bit arithmetic: */
int istatus = count - offset >= gt->cval;
uint64_t nexttick;
int irqstate;
gt->ctl = deposit32(gt->ctl, 2, 1, istatus);
qemu_set_irq(cpu->gt_timer_outputs[timeridx],
(istatus && !(gt->ctl & 2)));
irqstate = (istatus && !(gt->ctl & 2));
qemu_set_irq(cpu->gt_timer_outputs[timeridx], irqstate);
if (istatus) {
/* Next transition is when count rolls back over to zero */
nexttick = UINT64_MAX;
......@@ -1580,11 +1584,13 @@ static void gt_recalc_timer(ARMCPU *cpu, int timeridx)
nexttick = INT64_MAX / GTIMER_SCALE;
}
timer_mod(cpu->gt_timer[timeridx], nexttick);
trace_arm_gt_recalc(timeridx, irqstate, nexttick);
} else {
/* Timer disabled: ISTATUS and timer output always clear */
gt->ctl &= ~4;
qemu_set_irq(cpu->gt_timer_outputs[timeridx], 0);
timer_del(cpu->gt_timer[timeridx]);
trace_arm_gt_recalc_disabled(timeridx);
}
}
......@@ -1610,6 +1616,7 @@ static void gt_cval_write(CPUARMState *env, const ARMCPRegInfo *ri,
int timeridx,
uint64_t value)
{
trace_arm_gt_cval_write(timeridx, value);
env->cp15.c14_timer[timeridx].cval = value;
gt_recalc_timer(arm_env_get_cpu(env), timeridx);
}
......@@ -1629,6 +1636,7 @@ static void gt_tval_write(CPUARMState *env, const ARMCPRegInfo *ri,
{
uint64_t offset = timeridx == GTIMER_VIRT ? env->cp15.cntvoff_el2 : 0;
trace_arm_gt_tval_write(timeridx, value);
env->cp15.c14_timer[timeridx].cval = gt_get_countervalue(env) - offset +
sextract64(value, 0, 32);
gt_recalc_timer(arm_env_get_cpu(env), timeridx);
......@@ -1641,6 +1649,7 @@ static void gt_ctl_write(CPUARMState *env, const ARMCPRegInfo *ri,
ARMCPU *cpu = arm_env_get_cpu(env);
uint32_t oldval = env->cp15.c14_timer[timeridx].ctl;
trace_arm_gt_ctl_write(timeridx, value);
env->cp15.c14_timer[timeridx].ctl = deposit64(oldval, 0, 2, value);
if ((oldval ^ value) & 1) {
/* Enable toggled */
......@@ -1649,8 +1658,10 @@ static void gt_ctl_write(CPUARMState *env, const ARMCPRegInfo *ri,
/* IMASK toggled: don't need to recalculate,
* just set the interrupt line based on ISTATUS
*/
qemu_set_irq(cpu->gt_timer_outputs[timeridx],
(oldval & 4) && !(value & 2));
int irqstate = (oldval & 4) && !(value & 2);
trace_arm_gt_imask_toggle(timeridx, irqstate);
qemu_set_irq(cpu->gt_timer_outputs[timeridx], irqstate);
}
}
......@@ -1715,6 +1726,7 @@ static void gt_cntvoff_write(CPUARMState *env, const ARMCPRegInfo *ri,
{
ARMCPU *cpu = arm_env_get_cpu(env);
trace_arm_gt_cntvoff_write(value);
raw_write(env, ri, value);
gt_recalc_timer(cpu, GTIMER_VIRT);
}
......
# See docs/tracing.txt for syntax documentation.
# target-arm/helper.c
arm_gt_recalc(int timer, int irqstate, uint64_t nexttick) "gt recalc: timer %d irqstate %d next tick %" PRIx64
arm_gt_recalc_disabled(int timer) "gt recalc: timer %d irqstate 0 timer disabled"
arm_gt_cval_write(int timer, uint64_t value) "gt_cval_write: timer %d value %" PRIx64
arm_gt_tval_write(int timer, uint64_t value) "gt_tval_write: timer %d value %" PRIx64
arm_gt_ctl_write(int timer, uint64_t value) "gt_ctl_write: timer %d value %" PRIx64
arm_gt_imask_toggle(int timer, int irqstate) "gt_ctl_write: timer %d IMASK toggle, new irqstate %d"
arm_gt_cntvoff_write(uint64_t value) "gt_cntvoff_write: value %" PRIx64
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