diff options
| author | James Clark <james.clark@linaro.org> | 2025-09-01 13:40:35 +0100 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2025-09-18 14:17:02 +0100 |
| commit | 00d7a1af5ab58d89c2f0af27485b2d710c862dfc (patch) | |
| tree | 4e16db1e1f19b9a0bcc49a5553c9962d38abe4ed /arch/arm64/include/asm/el2_setup.h | |
| parent | 510a8fa49dc1d18b120e2d3992fa2aff7fc5c46b (diff) | |
arm64/boot: Enable EL2 requirements for SPE_FEAT_FDS
SPE data source filtering (optional from Armv8.8) requires that traps to
the filter register PMSDSFR be disabled. Document the requirements and
disable the traps if the feature is present.
Tested-by: Leo Yan <leo.yan@arm.com>
Reviewed-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: James Clark <james.clark@linaro.org>
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/include/asm/el2_setup.h')
| -rw-r--r-- | arch/arm64/include/asm/el2_setup.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/el2_setup.h b/arch/arm64/include/asm/el2_setup.h index a305386eb2e3..b37da3ee8529 100644 --- a/arch/arm64/include/asm/el2_setup.h +++ b/arch/arm64/include/asm/el2_setup.h @@ -392,6 +392,17 @@ orr x0, x0, #HDFGRTR2_EL2_nPMICFILTR_EL0 orr x0, x0, #HDFGRTR2_EL2_nPMUACR_EL1 .Lskip_pmuv3p9_\@: + /* If SPE is implemented, */ + __spe_vers_imp .Lskip_spefds_\@, ID_AA64DFR0_EL1_PMSVer_IMP, x1 + /* we can read PMSIDR and */ + mrs_s x1, SYS_PMSIDR_EL1 + and x1, x1, #PMSIDR_EL1_FDS + /* if FEAT_SPE_FDS is implemented, */ + cbz x1, .Lskip_spefds_\@ + /* disable traps of PMSDSFR to EL2. */ + orr x0, x0, #HDFGRTR2_EL2_nPMSDSFR_EL1 + +.Lskip_spefds_\@: msr_s SYS_HDFGRTR2_EL2, x0 msr_s SYS_HDFGWTR2_EL2, x0 msr_s SYS_HFGRTR2_EL2, xzr |