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target-arm: Add support for AArch64 PMU register PMXEVTYPER_EL0

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In order to support Linux perf, which uses PMXEVTYPER register,
this patch adds read/write access support for PMXEVTYPER. The access
is CONSTRAINED UNPREDICTABLE when PMSELR is not 0x1f. Additionally
this patch adds support for PMXEVTYPER_EL0.

Signed-off-by: Wei Huang <wei@redhat.com>
Message-id: 1486504171-26807-3-git-send-email-wei@redhat.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Wei Huang 2017-02-10 17:40:28 +00:00 committed by Peter Maydell
parent 6b0407805d
commit fdb8665672
2 changed files with 25 additions and 6 deletions
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1
target/arm/cpu.h
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@ -307,7 +307,6 @@ typedef struct CPUARMState {
uint64_t c9_pmcr; /* performance monitor control register */
uint64_t c9_pmcnten; /* perf monitor counter enables */
uint32_t c9_pmovsr; /* perf monitor overflow status */
uint32_t c9_pmxevtyper; /* perf monitor event type */
uint32_t c9_pmuserenr; /* perf monitor user enable */
uint64_t c9_pmselr; /* perf monitor counter selection register */
uint32_t c9_pminten; /* perf monitor interrupt enables */

30
target/arm/helper.c
View File

@ -1054,7 +1054,25 @@ static void pmovsr_write(CPUARMState *env, const ARMCPRegInfo *ri,
static void pmxevtyper_write(CPUARMState *env, const ARMCPRegInfo *ri,
uint64_t value)
{
env->cp15.c9_pmxevtyper = value & 0xff;
/* Attempts to access PMXEVTYPER are CONSTRAINED UNPREDICTABLE when
* PMSELR value is equal to or greater than the number of implemented
* counters, but not equal to 0x1f. We opt to behave as a RAZ/WI.
*/
if (env->cp15.c9_pmselr == 0x1f) {
pmccfiltr_write(env, ri, value);
}
}
static uint64_t pmxevtyper_read(CPUARMState *env, const ARMCPRegInfo *ri)
{
/* We opt to behave as a RAZ/WI when attempts to access PMXEVTYPER
* are CONSTRAINED UNPREDICTABLE. See comments in pmxevtyper_write().
*/
if (env->cp15.c9_pmselr == 0x1f) {
return env->cp15.pmccfiltr_el0;
} else {
return 0;
}
}
static void pmuserenr_write(CPUARMState *env, const ARMCPRegInfo *ri,
@ -1234,10 +1252,12 @@ static const ARMCPRegInfo v7_cp_reginfo[] = {
.fieldoffset = offsetof(CPUARMState, cp15.pmccfiltr_el0),
.resetvalue = 0, },
{ .name = "PMXEVTYPER", .cp = 15, .crn = 9, .crm = 13, .opc1 = 0, .opc2 = 1,
.access = PL0_RW,
.fieldoffset = offsetof(CPUARMState, cp15.c9_pmxevtyper),
.accessfn = pmreg_access, .writefn = pmxevtyper_write,
.raw_writefn = raw_write },
.access = PL0_RW, .type = ARM_CP_NO_RAW, .accessfn = pmreg_access,
.writefn = pmxevtyper_write, .readfn = pmxevtyper_read },
{ .name = "PMXEVTYPER_EL0", .state = ARM_CP_STATE_AA64,
.opc0 = 3, .opc1 = 3, .crn = 9, .crm = 13, .opc2 = 1,
.access = PL0_RW, .type = ARM_CP_NO_RAW, .accessfn = pmreg_access,
.writefn = pmxevtyper_write, .readfn = pmxevtyper_read },
/* Unimplemented, RAZ/WI. */
{ .name = "PMXEVCNTR", .cp = 15, .crn = 9, .crm = 13, .opc1 = 0, .opc2 = 2,
.access = PL0_RW, .type = ARM_CP_CONST, .resetvalue = 0,