From patchwork Mon Nov 30 23:23:38 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jerry Snitselaar X-Patchwork-Id: 11941505 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3ABE8C63777 for ; Mon, 30 Nov 2020 23:25:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A69702076C for ; Mon, 30 Nov 2020 23:25:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="ZxoBinYr" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730591AbgK3XZO (ORCPT ); Mon, 30 Nov 2020 18:25:14 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:38066 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726158AbgK3XZN (ORCPT ); Mon, 30 Nov 2020 18:25:13 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1606778627; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=2tm0ts6hF/lDJ0xq+K4NQnQ/+pAecSXKtAVp+dAxXA0=; b=ZxoBinYr6dh6UjzpkqoIPcrvP4CNDkulhuN0IAVWJ9aK1xC5mCXzRxC0DQKYyMVQ8IXiB/ +CYUopMorLqV2hdIRaelocmcszV1p6yTgg7uCN6gl6mpl6l06L9xlmytvK7ipqJFbQ18zi JqyLwC3MhofdqG4jUO0zB+NPsPxDnT0= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-213-sckWWLILP0yqObZECNOSjQ-1; Mon, 30 Nov 2020 18:23:43 -0500 X-MC-Unique: sckWWLILP0yqObZECNOSjQ-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 8861E1842146; Mon, 30 Nov 2020 23:23:41 +0000 (UTC) Received: from cantor.redhat.com (ovpn-115-84.phx2.redhat.com [10.3.115.84]) by smtp.corp.redhat.com (Postfix) with ESMTP id 134AC5D9C0; Mon, 30 Nov 2020 23:23:41 +0000 (UTC) From: Jerry Snitselaar To: linux-kernel@vger.kernel.org, linux-integrity@vger.kernel.org Cc: Jarkko Sakkinen , Jason Gunthorpe , Peter Huewe , James Bottomley , Matthew Garrett , Hans de Goede Subject: [PATCH] tpm_tis: Disable interrupts if interrupt storm detected Date: Mon, 30 Nov 2020 16:23:38 -0700 Message-Id: <20201130232338.106892-1-jsnitsel@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org When enabling the interrupt code for the tpm_tis driver we have noticed some systems have a bios issue causing an interrupt storm to occur. The issue isn't limited to a single tpm or system vendor so keeping a denylist of systems with the issue isn't optimal. Instead try to detect the problem occurring, disable interrupts, and revert to polling when it happens. Cc: Jarkko Sakkinen Cc: Jason Gunthorpe Cc: Peter Huewe Cc: James Bottomley Cc: Matthew Garrett Cc: Hans de Goede Signed-off-by: Jerry Snitselaar --- drivers/char/tpm/tpm_tis_core.c | 34 +++++++++++++++++++++++++++++++++ drivers/char/tpm/tpm_tis_core.h | 2 ++ 2 files changed, 36 insertions(+) diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c index 92c51c6cfd1b..19115a628f25 100644 --- a/drivers/char/tpm/tpm_tis_core.c +++ b/drivers/char/tpm/tpm_tis_core.c @@ -24,6 +24,8 @@ #include #include #include +#include +#include #include "tpm.h" #include "tpm_tis_core.h" @@ -711,13 +713,30 @@ static bool tpm_tis_req_canceled(struct tpm_chip *chip, u8 status) } } +static struct workqueue_struct *tpm_tis_wq; +static DEFINE_MUTEX(tpm_tis_wq_lock); + static irqreturn_t tis_int_handler(int dummy, void *dev_id) { struct tpm_chip *chip = dev_id; struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); + static bool check_storm = true; + static unsigned int check_start; u32 interrupt; int i, rc; + if (unlikely(check_storm)) { + if (!check_start) { + check_start = jiffies_to_msecs(jiffies); + } else if ((kstat_irqs(priv->irq) > 1000) && + (jiffies_to_msecs(jiffies) - check_start < 500)) { + check_storm = false; + queue_work(tpm_tis_wq, &priv->storm_work); + } else if (jiffies_to_msecs(jiffies) - check_start >= 500) { + check_storm = false; + } + } + rc = tpm_tis_read32(priv, TPM_INT_STATUS(priv->locality), &interrupt); if (rc < 0) return IRQ_NONE; @@ -943,6 +962,14 @@ static const struct tpm_class_ops tpm_tis = { .clk_enable = tpm_tis_clkrun_enable, }; +static void tpm_tis_storm_work(struct work_struct *work) +{ + struct tpm_tis_data *priv = container_of(work, struct tpm_tis_data, storm_work); + + disable_interrupts(priv->chip); + dev_warn(&priv->chip->dev, "Interrupt storm detected, using polling.\n"); +} + int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq, const struct tpm_tis_phy_ops *phy_ops, acpi_handle acpi_dev_handle) @@ -959,6 +986,13 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq, if (IS_ERR(chip)) return PTR_ERR(chip); + priv->chip = chip; + tpm_tis_wq = alloc_workqueue("tpm_tis_wq", WQ_MEM_RECLAIM, 0); + if (!tpm_tis_wq) + return -ENOMEM; + + INIT_WORK(&priv->storm_work, tpm_tis_storm_work); + #ifdef CONFIG_ACPI chip->acpi_dev_handle = acpi_dev_handle; #endif diff --git a/drivers/char/tpm/tpm_tis_core.h b/drivers/char/tpm/tpm_tis_core.h index 9b2d32a59f67..973297ee2e16 100644 --- a/drivers/char/tpm/tpm_tis_core.h +++ b/drivers/char/tpm/tpm_tis_core.h @@ -95,6 +95,8 @@ struct tpm_tis_data { u16 clkrun_enabled; wait_queue_head_t int_queue; wait_queue_head_t read_queue; + struct work_struct storm_work; + struct tpm_chip *chip; const struct tpm_tis_phy_ops *phy_ops; unsigned short rng_quality; };