From: "Naveen N Rao (AMD)" <naveen@kernel.org>
To: Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>
Cc: <linux-kernel@vger.kernel.org>, <x86@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Bharata B Rao <bharata@amd.com>,
Manali Shukla <manali.shukla@amd.com>,
Nikunj A Dadhania <nikunj@amd.com>,
"H. Peter Anvin" <hpa@zytor.com>
Subject: [PATCH RESEND v4 1/3] perf/amd/ibs: Limit the max EILVT register count for AMD family 0x10
Date: Thu, 3 Sep 2026 14:58:39 +0530 [thread overview]
Message-ID: <b98bf368f4c0e2af51ab8f9dbe3acaf11ebfee40.1788425679.git.naveen@kernel.org> (raw)
In-Reply-To: <cover.1788425679.git.naveen@kernel.org>
For AMD family 0x10, EILVT offsets are not assigned by BIOS and is
instead assigned by picking the next available EILVT offset. Use the
maximum EILVT count for family 0x10 (APIC_EILVT_NR_AMD_10H) rather than
an arbitrary maximum EILVT count when looking for the next available
EILVT offset.
Signed-off-by: Naveen N Rao (AMD) <naveen@kernel.org>
Tested-by: Manali Shukla <manali.shukla@amd.com>
---
arch/x86/events/amd/ibs.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/events/amd/ibs.c b/arch/x86/events/amd/ibs.c
index 3531f9c23b8c..555912ac520f 100644
--- a/arch/x86/events/amd/ibs.c
+++ b/arch/x86/events/amd/ibs.c
@@ -1839,13 +1839,13 @@ static void force_ibs_eilvt_setup(void)
preempt_disable();
/* find the next free available EILVT entry, skip offset 0 */
- for (offset = 1; offset < APIC_EILVT_NR_MAX; offset++) {
+ for (offset = 1; offset < APIC_EILVT_NR_AMD_10H; offset++) {
if (get_eilvt(offset))
break;
}
preempt_enable();
- if (offset == APIC_EILVT_NR_MAX) {
+ if (offset == APIC_EILVT_NR_AMD_10H) {
pr_debug("No EILVT entry available\n");
return;
}
--
2.55.0
next prev parent reply other threads:[~2026-09-03 9:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-03 9:28 [PATCH RESEND v4 0/3] x86/apic: Add support for additional AMD EILVT registers Naveen N Rao (AMD)
2026-09-03 9:28 ` Naveen N Rao (AMD) [this message]
2026-09-03 9:28 ` [PATCH RESEND v4 2/3] x86/apic: Introduce a variable to track the number of " Naveen N Rao (AMD)
2026-09-03 9:28 ` [PATCH RESEND v4 3/3] x86/apic: Drop APIC_EILVT_NR_MAX Naveen N Rao (AMD)
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