From: Cody Yao-oc <CodyYao-oc@zhaoxin.com>
To: <peterz@infradead.org>, <mingo@redhat.com>, <acme@kernel.org>,
<mark.rutland@arm.com>, <alexander.shishkin@linux.intel.com>,
<jolsa@redhat.com>, <namhyung@kernel.org>, <tglx@linutronix.de>,
<bp@alien8.de>, <hpa@zytor.com>, <x86@kernel.org>
Cc: <linux-perf-users@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <shyaololo@163.com>,
CodyYao-oc <CodyYao-oc@zhaoxin.com>
Subject: [PATCH] x86/perf: Fixed kernel panic during boot on Nano processor.
Date: Mon, 7 Jun 2021 09:31:09 +0800 [thread overview]
Message-ID: <20210607013109.7870-1-CodyYao-oc@zhaoxin.com> (raw)
From: CodyYao-oc <CodyYao-oc@zhaoxin.com>
Nano processor may not fully support rdpmc instruction, it works well
for reading general pmc counter, but will lead to GP(general protection)
when accessing fixed pmc counter. Futhermore, family/model information
is same between Nano processor and ZX-C processor, it leads to zhaoxin
pmu driver is wrongly loaded for Nano processor, which resulting boot
kernal fail.
To solve this problem, stepping information will be checked to distinguish
between Nano processor and ZX-C processor.
[https://bugzilla.kernel.org/show_bug.cgi?id=212389]
Reported-by: Arjan <8vvbbqzo567a@nospam.xutrox.com>
Signed-off-by: CodyYao-oc <CodyYao-oc@zhaoxin.com>
---
arch/x86/events/zhaoxin/core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/x86/events/zhaoxin/core.c b/arch/x86/events/zhaoxin/core.c
index 949d845c922b..cef1de251613 100644
--- a/arch/x86/events/zhaoxin/core.c
+++ b/arch/x86/events/zhaoxin/core.c
@@ -541,7 +541,8 @@ __init int zhaoxin_pmu_init(void)
switch (boot_cpu_data.x86) {
case 0x06:
- if (boot_cpu_data.x86_model == 0x0f || boot_cpu_data.x86_model == 0x19) {
+ if ((boot_cpu_data.x86_model == 0x0f && boot_cpu_data.x86_stepping >= 0x0e) ||
+ boot_cpu_data.x86_model == 0x19) {
x86_pmu.max_period = x86_pmu.cntval_mask >> 1;
--
2.17.1
next reply other threads:[~2021-06-07 1:32 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-07 1:31 Cody Yao-oc [this message]
2021-06-30 4:38 ` [PATCH] x86/perf: Fixed kernel panic during boot on Nano processor Codyyao-oc
2022-10-13 13:49 ` Thorsten Leemhuis
2022-10-13 13:59 ` Peter Zijlstra
2022-10-13 15:07 ` Peter Zijlstra
2022-10-16 9:53 ` Arjan
2022-10-16 9:59 ` Peter Zijlstra
2022-10-16 10:56 ` 8vvbbqzo567a
2022-11-03 3:23 silviazhao-oc
2022-11-03 10:07 ` Borislav Petkov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210607013109.7870-1-CodyYao-oc@zhaoxin.com \
--to=codyyao-oc@zhaoxin.com \
--cc=acme@kernel.org \
--cc=alexander.shishkin@linux.intel.com \
--cc=bp@alien8.de \
--cc=hpa@zytor.com \
--cc=jolsa@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-perf-users@vger.kernel.org \
--cc=mark.rutland@arm.com \
--cc=mingo@redhat.com \
--cc=namhyung@kernel.org \
--cc=peterz@infradead.org \
--cc=shyaololo@163.com \
--cc=tglx@linutronix.de \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).