From: "Naveen N Rao (AMD)" <naveen@kernel.org>
To: <x86@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>, <linux-kernel@vger.kernel.org>,
Nikunj A Dadhania <nikunj@amd.com>,
Manali Shukla <manali.shukla@amd.com>,
Bharata B Rao <bharata@amd.com>
Subject: [PATCH 3/5] perf/amd/ibs: Limit the max EILVT register count for AMD family 0x10
Date: Wed, 1 Apr 2026 10:26:34 +0530 [thread overview]
Message-ID: <2086bdb889d265e5da5b48b61580fe4b7db340ee.1775019269.git.naveen@kernel.org> (raw)
In-Reply-To: <cover.1775019269.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 e0bd5051db2a..61d14cbdda49 100644
--- a/arch/x86/events/amd/ibs.c
+++ b/arch/x86/events/amd/ibs.c
@@ -1838,13 +1838,13 @@ 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;
}
--
2.53.0
next prev parent reply other threads:[~2026-04-01 4:57 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-01 4:56 [PATCH 0/5] Support additional AMD EILVT registers Naveen N Rao (AMD)
2026-04-01 4:56 ` [PATCH 1/5] x86/apic: Drop AMD Extended Interrupt LVT macros Naveen N Rao (AMD)
2026-04-03 23:06 ` [tip: x86/cleanups] " tip-bot2 for Naveen N Rao (AMD)
2026-04-01 4:56 ` [PATCH 2/5] x86/apic: Drop unused AMD EILVT macros Naveen N Rao (AMD)
2026-04-01 4:56 ` Naveen N Rao (AMD) [this message]
2026-04-01 4:56 ` [PATCH 4/5] x86/apic: Introduce a variable to track the number of EILVT registers Naveen N Rao (AMD)
2026-04-08 10:24 ` Naveen N Rao
2026-04-01 4:56 ` [PATCH 5/5] x86/apic: Drop APIC_EILVT_NR_MAX and switch to using apic_eilvt_count Naveen N Rao (AMD)
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