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perf: arm_brbe: Remove the check for TME transaction states

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When an event samples branch flags, the BRBE driver warns once if a
branch record has BRBINFx_EL1.T or LASTFAILED set, which its comment
calls TME-related information. FEAT_TME has been withdrawn from the
architecture, and both fields are RES0 in DDI0601 2026-09, so the check
tests fields that no longer exist.

Remove the check and its two accessors, which were the only users of
the fields' defines, and mark both fields RES0 in the sysreg file.

Signed-off-by: Fuad Tabba <fuad.tabba@linux.dev>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Fuad Tabba 2026-10-13 14:02:47 +01:00 committed by Catalin Marinas
parent cbaca3920f
commit 4a90fba44e
2 changed files with 1 additions and 22 deletions
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5
arch/arm64/tools/sysreg
View File

@ -1338,10 +1338,7 @@ Res0 63:47
Field 46 CCU
Field 45:40 CC_EXP
Field 39:32 CC_MANT
Res0 31:18
Field 17 LASTFAILED
Field 16 T
Res0 15:14
Res0 31:14
Enum 13:8 TYPE
0b000000 DIRECT_UNCOND
0b000001 INDIRECT

18
drivers/perf/arm_brbe.c
View File

@ -166,21 +166,11 @@ static bool brbe_record_is_target_only(u64 brbinf)
return brbe_record_valid(brbinf) == BRBINFx_EL1_VALID_TARGET;
}
static int brbinf_get_in_tx(u64 brbinf)
{
return FIELD_GET(BRBINFx_EL1_T_MASK, brbinf);
}
static int brbinf_get_mispredict(u64 brbinf)
{
return FIELD_GET(BRBINFx_EL1_MPRED_MASK, brbinf);
}
static int brbinf_get_lastfailed(u64 brbinf)
{
return FIELD_GET(BRBINFx_EL1_LASTFAILED_MASK, brbinf);
}
static u16 brbinf_get_cycles(u64 brbinf)
{
u32 exp, mant, cycles;
@ -627,14 +617,6 @@ static bool perf_entry_from_brbe_regset(int index, struct perf_branch_entry *ent
entry->mispred = brbinf_get_mispredict(brbinf);
entry->predicted = !entry->mispred;
}
/*
* Currently TME feature is neither implemented in any hardware
* nor it is being supported in the kernel. Just warn here once
* if TME related information shows up rather unexpectedly.
*/
if (brbinf_get_lastfailed(brbinf) || brbinf_get_in_tx(brbinf))
pr_warn_once("Unknown transaction states\n");
}
/*