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hwpmc/arm64: Support the kernel booting to VHE

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When booting to VHE we need to handle using the PMU at either EL1 or
EL2. WE already support EL1 so add support for EL2.

Reviewed by:	mhorne
Sponsored by:	Arm Ltd
Differential Revision:	https://reviews.freebsd.org/D45527
This commit is contained in:
Andrew Turner 2024-06-25 09:41:50 +01:00
parent 915161b3d3
commit c36fa8d502
1 changed files with 13 additions and 0 deletions
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13
sys/dev/hwpmc/hwpmc_arm64.c
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@ -34,6 +34,7 @@
#include <machine/pmc_mdep.h>
#include <machine/cpu.h>
#include <machine/machdep.h>
#include "opt_acpi.h"
@ -186,10 +187,18 @@ arm64_allocate_pmc(int cpu, int ri, struct pmc *pm,
switch (a->pm_caps & (PMC_CAP_SYSTEM | PMC_CAP_USER)) {
case PMC_CAP_SYSTEM:
/* Exclude EL0 */
config |= PMEVTYPER_U;
if (in_vhe()) {
/* If in VHE we need to include EL2 and exclude EL1 */
config |= PMEVTYPER_NSH | PMEVTYPER_P;
}
break;
case PMC_CAP_USER:
/* Exclude EL1 */
config |= PMEVTYPER_P;
/* Exclude EL2 */
config &= ~PMEVTYPER_NSH;
break;
default:
/*
@ -197,6 +206,10 @@ arm64_allocate_pmc(int cpu, int ri, struct pmc *pm,
* (default setting) or if both flags are specified
* (user explicitly requested both qualifiers).
*/
if (in_vhe()) {
/* If in VHE we need to include EL2 */
config |= PMEVTYPER_NSH;
}
break;
}