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target/arm: Send interrupts on PMU counter overflow

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Whenever we notice that a counter overflow has occurred, send an
interrupt. This is made more reliable with the addition of a timer in a
follow-on commit.

Signed-off-by: Aaron Lindsay <aaron@os.amperecomputing.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20190124162401.5111-2-aaron@os.amperecomputing.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Aaron Lindsay OS 2019-02-01 14:55:45 +00:00 committed by Peter Maydell
parent eaefb97a8b
commit f4efb4b2a1
1 changed files with 51 additions and 10 deletions
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61
target/arm/helper.c
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@ -977,6 +977,7 @@ static const ARMCPRegInfo v6_cp_reginfo[] = {
/* Definitions for the PMU registers */
#define PMCRN_MASK 0xf800
#define PMCRN_SHIFT 11
#define PMCRLC 0x40
#define PMCRDP 0x10
#define PMCRD 0x8
#define PMCRC 0x4
@ -1293,6 +1294,13 @@ static bool pmu_counter_enabled(CPUARMState *env, uint8_t counter)
return enabled && !prohibited && !filtered;
}
static void pmu_update_irq(CPUARMState *env)
{
ARMCPU *cpu = arm_env_get_cpu(env);
qemu_set_irq(cpu->pmu_interrupt, (env->cp15.c9_pmcr & PMCRE) &&
(env->cp15.c9_pminten & env->cp15.c9_pmovsr));
}
/*
* Ensure c15_ccnt is the guest-visible count so that operations such as
* enabling/disabling the counter or filtering, modifying the count itself,
@ -1310,7 +1318,16 @@ void pmccntr_op_start(CPUARMState *env)
eff_cycles /= 64;
}
env->cp15.c15_ccnt = eff_cycles - env->cp15.c15_ccnt_delta;
uint64_t new_pmccntr = eff_cycles - env->cp15.c15_ccnt_delta;
uint64_t overflow_mask = env->cp15.c9_pmcr & PMCRLC ? \
1ull << 63 : 1ull << 31;
if (env->cp15.c15_ccnt & ~new_pmccntr & overflow_mask) {
env->cp15.c9_pmovsr |= (1 << 31);
pmu_update_irq(env);
}
env->cp15.c15_ccnt = new_pmccntr;
}
env->cp15.c15_ccnt_delta = cycles;
}
@ -1345,8 +1362,13 @@ static void pmevcntr_op_start(CPUARMState *env, uint8_t counter)
}
if (pmu_counter_enabled(env, counter)) {
env->cp15.c14_pmevcntr[counter] =
count - env->cp15.c14_pmevcntr_delta[counter];
uint32_t new_pmevcntr = count - env->cp15.c14_pmevcntr_delta[counter];
if (env->cp15.c14_pmevcntr[counter] & ~new_pmevcntr & INT32_MIN) {
env->cp15.c9_pmovsr |= (1 << counter);
pmu_update_irq(env);
}
env->cp15.c14_pmevcntr[counter] = new_pmevcntr;
}
env->cp15.c14_pmevcntr_delta[counter] = count;
}
@ -1423,7 +1445,20 @@ static void pmswinc_write(CPUARMState *env, const ARMCPRegInfo *ri,
/* counter is SW_INCR */
(env->cp15.c14_pmevtyper[i] & PMXEVTYPER_EVTCOUNT) == 0x0) {
pmevcntr_op_start(env, i);
env->cp15.c14_pmevcntr[i]++;
/*
* Detect if this write causes an overflow since we can't predict
* PMSWINC overflows like we can for other events
*/
uint32_t new_pmswinc = env->cp15.c14_pmevcntr[i] + 1;
if (env->cp15.c14_pmevcntr[i] & ~new_pmswinc & INT32_MIN) {
env->cp15.c9_pmovsr |= (1 << i);
pmu_update_irq(env);
}
env->cp15.c14_pmevcntr[i] = new_pmswinc;
pmevcntr_op_finish(env, i);
}
}
@ -1508,6 +1543,7 @@ static void pmovsr_write(CPUARMState *env, const ARMCPRegInfo *ri,
{
value &= pmu_counter_mask(env);
env->cp15.c9_pmovsr &= ~value;
pmu_update_irq(env);
}
static void pmovsset_write(CPUARMState *env, const ARMCPRegInfo *ri,
@ -1515,6 +1551,7 @@ static void pmovsset_write(CPUARMState *env, const ARMCPRegInfo *ri,
{
value &= pmu_counter_mask(env);
env->cp15.c9_pmovsr |= value;
pmu_update_irq(env);
}
static void pmevtyper_write(CPUARMState *env, const ARMCPRegInfo *ri,
@ -1701,6 +1738,7 @@ static void pmintenset_write(CPUARMState *env, const ARMCPRegInfo *ri,
/* We have no event counters so only the C bit can be changed */
value &= pmu_counter_mask(env);
env->cp15.c9_pminten |= value;
pmu_update_irq(env);
}
static void pmintenclr_write(CPUARMState *env, const ARMCPRegInfo *ri,
@ -1708,6 +1746,7 @@ static void pmintenclr_write(CPUARMState *env, const ARMCPRegInfo *ri,
{
value &= pmu_counter_mask(env);
env->cp15.c9_pminten &= ~value;
pmu_update_irq(env);
}
static void vbar_write(CPUARMState *env, const ARMCPRegInfo *ri,
@ -1846,7 +1885,7 @@ static const ARMCPRegInfo v7_cp_reginfo[] = {
.fieldoffset = offsetof(CPUARMState, cp15.c9_pmcnten),
.writefn = pmcntenclr_write },
{ .name = "PMOVSR", .cp = 15, .crn = 9, .crm = 12, .opc1 = 0, .opc2 = 3,
.access = PL0_RW,
.access = PL0_RW, .type = ARM_CP_IO,
.fieldoffset = offsetoflow32(CPUARMState, cp15.c9_pmovsr),
.accessfn = pmreg_access,
.writefn = pmovsr_write,
@ -1854,16 +1893,18 @@ static const ARMCPRegInfo v7_cp_reginfo[] = {
{ .name = "PMOVSCLR_EL0", .state = ARM_CP_STATE_AA64,
.opc0 = 3, .opc1 = 3, .crn = 9, .crm = 12, .opc2 = 3,
.access = PL0_RW, .accessfn = pmreg_access,
.type = ARM_CP_ALIAS,
.type = ARM_CP_ALIAS | ARM_CP_IO,
.fieldoffset = offsetof(CPUARMState, cp15.c9_pmovsr),
.writefn = pmovsr_write,
.raw_writefn = raw_write },
{ .name = "PMSWINC", .cp = 15, .crn = 9, .crm = 12, .opc1 = 0, .opc2 = 4,
.access = PL0_W, .accessfn = pmreg_access_swinc, .type = ARM_CP_NO_RAW,
.access = PL0_W, .accessfn = pmreg_access_swinc,
.type = ARM_CP_NO_RAW | ARM_CP_IO,
.writefn = pmswinc_write },
{ .name = "PMSWINC_EL0", .state = ARM_CP_STATE_AA64,
.opc0 = 3, .opc1 = 3, .crn = 9, .crm = 12, .opc2 = 4,
.access = PL0_W, .accessfn = pmreg_access_swinc, .type = ARM_CP_NO_RAW,
.access = PL0_W, .accessfn = pmreg_access_swinc,
.type = ARM_CP_NO_RAW | ARM_CP_IO,
.writefn = pmswinc_write },
{ .name = "PMSELR", .cp = 15, .crn = 9, .crm = 12, .opc1 = 0, .opc2 = 5,
.access = PL0_RW, .type = ARM_CP_ALIAS,
@ -2050,14 +2091,14 @@ static const ARMCPRegInfo pmovsset_cp_reginfo[] = {
/* PMOVSSET is not implemented in v7 before v7ve */
{ .name = "PMOVSSET", .cp = 15, .opc1 = 0, .crn = 9, .crm = 14, .opc2 = 3,
.access = PL0_RW, .accessfn = pmreg_access,
.type = ARM_CP_ALIAS,
.type = ARM_CP_ALIAS | ARM_CP_IO,
.fieldoffset = offsetoflow32(CPUARMState, cp15.c9_pmovsr),
.writefn = pmovsset_write,
.raw_writefn = raw_write },
{ .name = "PMOVSSET_EL0", .state = ARM_CP_STATE_AA64,
.opc0 = 3, .opc1 = 3, .crn = 9, .crm = 14, .opc2 = 3,
.access = PL0_RW, .accessfn = pmreg_access,
.type = ARM_CP_ALIAS,
.type = ARM_CP_ALIAS | ARM_CP_IO,
.fieldoffset = offsetof(CPUARMState, cp15.c9_pmovsr),
.writefn = pmovsset_write,
.raw_writefn = raw_write },