From nobody Wed Dec 17 12:35:41 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3D86BC4167B for ; Mon, 27 Nov 2023 10:00:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232555AbjK0KAN (ORCPT ); Mon, 27 Nov 2023 05:00:13 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38474 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232492AbjK0KAI (ORCPT ); Mon, 27 Nov 2023 05:00:08 -0500 X-Greylist: delayed 344 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Mon, 27 Nov 2023 02:00:14 PST Received: from mta-04.yadro.com (mta-04.yadro.com [89.207.88.248]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0580A101 for ; Mon, 27 Nov 2023 02:00:13 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 mta-04.yadro.com 2DF2FC0005 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=syntacore.com; s=mta-04; t=1701078866; bh=Ae63xGVgAa9+JIzkWIlv6C6QPlVWMSpbmQ3FkALhZs8=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:From; b=VsxZFAd/he9gD5lQmeXPpLoJk1T8Rl1n5iH3PvTRPhJKcL0/LgKxxxlhNoUijs7mf YVomii5R0nigOmK1ncB2PPqJoGGFvnT5SqKGvJ/9SuJfS1LMTjUcEnhMzb2ucnG/f2 Szi5lAbD55CeX68T07pRYJyxSrrF7zKKBU919T9uG4hboabjxG5t92n/PwQzt/W0HF Gm6Cd8gPlQWFa453m39khNoOljOeokmCg5SWV0C6BD0faGre5ugUCkn0PO2iFG5vdR ljz1mh0faZfU/4pdk6Om+Y77IDktIVjwTlvKsJz4V1UXGQFarcLgzAZmEsTOBsIi3M Mj2bDgb4/BEtg== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=syntacore.com; s=mta-03; t=1701078866; bh=Ae63xGVgAa9+JIzkWIlv6C6QPlVWMSpbmQ3FkALhZs8=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:From; b=P31Uj+/YGTH0My6YJ6GFdj2lQmPH7RSynEcnoTcd0+APt+ieTJ1OcF3YDuDQ86FBA RxIej12JKDGpDSSHaqSYSEJJyZ9lYm8ybn7jl9PwqPdHe+QfopjszdhPqVVu8FIyBU RNjK9SuLNhuZN1zMmdH5Gf/IoHSBjIa0kKFp9PmaqbtdFNhBgnbPci/vz+TP/GObYT zVK1hnnvM5qq1m0E+xA7puysJNWchJWL0YlLJmxpx9GYpoH87pU+ys42HvUIBP6L7+ Zn1Q7PCxfyCEkgkUKN2CKgysNUoIPM+5OwvCZ3TWtWK/JgQ6hHX+vXDVPfKJoC+IO8 Ceer8cWnARJyA== From: Vadim Shakirov To: Atish Patra CC: Vadim Shakirov , Anup Patel , Will Deacon , Mark Rutland , Paul Walmsley , "Palmer Dabbelt" , Albert Ou , "Alexandre Ghiti" , Andrew Jones , , Subject: [PATCH] drivers: perf: ctr_get_width function for legacy is not defined Date: Mon, 27 Nov 2023 12:54:03 +0300 Message-ID: <20231127095403.272424-1-vadim.shakirov@syntacore.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: T-EXCH-10.corp.yadro.com (172.17.11.60) To S-Exch-01.corp.yadro.com (10.78.5.241) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" With parameters CONFIG_RISCV_PMU_LEGACY=3Dy and CONFIG_RISCV_PMU_SBI=3Dn linux kernel crashes when you try perf record: $ perf record ls [ 46.749286] Unable to handle kernel NULL pointer dereference at virtual = address 0000000000000000 [ 46.750199] Oops [#1] [ 46.750342] Modules linked in: [ 46.750608] CPU: 0 PID: 107 Comm: perf-exec Not tainted 6.6.0 #2 [ 46.750906] Hardware name: riscv-virtio,qemu (DT) [ 46.751184] epc : 0x0 [ 46.751430] ra : arch_perf_update_userpage+0x54/0x13e [ 46.751680] epc : 0000000000000000 ra : ffffffff8072ee52 sp : ff20000000= 22b8f0 [ 46.751958] gp : ffffffff81505988 tp : ff6000000290d400 t0 : ff20000000= 22b9c0 [ 46.752229] t1 : 0000000000000001 t2 : 0000000000000003 s0 : ff20000000= 22b930 [ 46.752451] s1 : ff600000028fb000 a0 : 0000000000000000 a1 : ff60000002= 8fb000 [ 46.752673] a2 : 0000000ae2751268 a3 : 00000000004fb708 a4 : 0000000000= 000004 [ 46.752895] a5 : 0000000000000000 a6 : 000000000017ffe3 a7 : 0000000000= 0000d2 [ 46.753117] s2 : ff600000028fb000 s3 : 0000000ae2751268 s4 : 0000000000= 000000 [ 46.753338] s5 : ffffffff8153e290 s6 : ff600000863b9000 s7 : ff60000002= 961078 [ 46.753562] s8 : ff60000002961048 s9 : ff60000002961058 s10: 0000000000= 000001 [ 46.753783] s11: 0000000000000018 t3 : ffffffffffffffff t4 : ffffffffff= ffffff [ 46.754005] t5 : ff6000000292270c t6 : ff2000000022bb30 [ 46.754179] status: 0000000200000100 badaddr: 0000000000000000 cause: 00= 0000000000000c [ 46.754653] Code: Unable to access instruction at 0xffffffffffffffec. [ 46.754939] ---[ end trace 0000000000000000 ]--- [ 46.755131] note: perf-exec[107] exited with irqs disabled [ 46.755546] note: perf-exec[107] exited with preempt_count 4 This happens because in the legacy case the ctr_get_width function was not defined, but it is used in arch_perf_update_userpage. Fixes: cc4c07c89aad ("drivers: perf: Implement perf event mmap support in t= he SBI backend") Signed-off-by: Vadim Shakirov --- drivers/perf/riscv_pmu_legacy.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/perf/riscv_pmu_legacy.c b/drivers/perf/riscv_pmu_legac= y.c index 79fdd667922e..a179ed6ac980 100644 --- a/drivers/perf/riscv_pmu_legacy.c +++ b/drivers/perf/riscv_pmu_legacy.c @@ -37,6 +37,12 @@ static int pmu_legacy_event_map(struct perf_event *event= , u64 *config) return pmu_legacy_ctr_get_idx(event); } =20 +/* cycle & instret are always 64 bit, one bit less according to SBI spec */ +static int pmu_legacy_ctr_get_width(int idx) +{ + return 63; +} + static u64 pmu_legacy_read_ctr(struct perf_event *event) { struct hw_perf_event *hwc =3D &event->hw; @@ -111,7 +117,7 @@ static void pmu_legacy_init(struct riscv_pmu *pmu) pmu->ctr_stop =3D NULL; pmu->event_map =3D pmu_legacy_event_map; pmu->ctr_get_idx =3D pmu_legacy_ctr_get_idx; - pmu->ctr_get_width =3D NULL; + pmu->ctr_get_width =3D pmu_legacy_ctr_get_width; pmu->ctr_clear_idx =3D NULL; pmu->ctr_read =3D pmu_legacy_read_ctr; pmu->event_mapped =3D pmu_legacy_event_mapped; --=20 2.34.1