From nobody Mon Nov 08 19:34:57 2021 X-Original-To: dev-commits-src-all@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 5E8B91833B3C; Mon, 8 Nov 2021 19:34:57 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Hp1Xd2GZjz4XVn; Mon, 8 Nov 2021 19:34:57 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 2D827176CF; Mon, 8 Nov 2021 19:34:57 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 1A8JYvcf002876; Mon, 8 Nov 2021 19:34:57 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 1A8JYvHF002875; Mon, 8 Nov 2021 19:34:57 GMT (envelope-from git) Date: Mon, 8 Nov 2021 19:34:57 GMT Message-Id: <202111081934.1A8JYvHF002875@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Mitchell Horne Subject: git: b826cc3caf6a - main - hwpmc: initialize arm64 counter/interrupt state List-Id: Commit messages for all branches of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-all List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-dev-commits-src-all@freebsd.org X-BeenThere: dev-commits-src-all@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: mhorne X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: b826cc3caf6abc6a5d1926bd478b464938d45697 Auto-Submitted: auto-generated X-ThisMailContainsUnwantedMimeParts: N The branch main has been updated by mhorne: URL: https://cgit.FreeBSD.org/src/commit/?id=b826cc3caf6abc6a5d1926bd478b464938d45697 commit b826cc3caf6abc6a5d1926bd478b464938d45697 Author: Mitchell Horne AuthorDate: 2021-11-08 19:33:25 +0000 Commit: Mitchell Horne CommitDate: 2021-11-08 19:33:25 +0000 hwpmc: initialize arm64 counter/interrupt state Performance counters and overflow interrupts are assumed to be disabled by default, but this is not guaranteed. Ensure we disable both during per-cpu initialization, before enabling the PMU. Otherwise, some systems (such as the Ampere eMAG) would experience an interrupt storm upon loading the hwpmc module. Reviewed by: br MFC after: 5 days Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D32854 --- sys/dev/hwpmc/hwpmc_arm64.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/sys/dev/hwpmc/hwpmc_arm64.c b/sys/dev/hwpmc/hwpmc_arm64.c index 14283b22644d..14c176894c6a 100644 --- a/sys/dev/hwpmc/hwpmc_arm64.c +++ b/sys/dev/hwpmc/hwpmc_arm64.c @@ -483,6 +483,16 @@ arm64_pcpu_init(struct pmc_mdep *md, int cpu) pc->pc_hwpmcs[i + first_ri] = phw; } + /* + * Disable all counters and overflow interrupts. Upon reset they are in + * an undefined state. + * + * Don't issue an isb here, just wait for the one in arm64_pmcr_write() + * to make the writes visible. + */ + WRITE_SPECIALREG(pmcntenclr_el0, 0xffffffff); + WRITE_SPECIALREG(pmintenclr_el1, 0xffffffff); + /* Enable unit */ pmcr = arm64_pmcr_read(); pmcr |= PMCR_E;