From mboxrd@z Thu Jan 1 00:00:00 1970 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=-10.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 E45FDC4741F for ; Fri, 6 Nov 2020 15:32:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 926DE22228 for ; Fri, 6 Nov 2020 15:32:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604676731; bh=0guWgWOhBJjpKxcFuluFRrOG+EVHnYpp2ICD8G5pDTc=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=wTnauzozkOwE84Ldu8v+llLTxV7owWYKbqUVuIl0w+8nHkgrQMclNTutIW49qeAKu 8vfqBXuxXOdwa/KjJZyD73fCMLJiNAbPbq/B3U3I12zJLGPHwwNYdoop7D8xDQer0/ MEh1DHsdjtr/a3i2dXV0fS7AUxDE+pKM+i0QKh9k= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727182AbgKFPcL (ORCPT ); Fri, 6 Nov 2020 10:32:11 -0500 Received: from mail.kernel.org ([198.145.29.99]:51486 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726812AbgKFPcK (ORCPT ); Fri, 6 Nov 2020 10:32:10 -0500 Received: from kernel.org (83-245-197-237.elisa-laajakaista.fi [83.245.197.237]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id DE657208C7; Fri, 6 Nov 2020 15:32:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604676730; bh=0guWgWOhBJjpKxcFuluFRrOG+EVHnYpp2ICD8G5pDTc=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=ZWv59sVO0fwIONWpTG7lJFAqEet+s0rWnLK2cn8AtmnQ3GPvkDiDBuGi+W6QbVI4C OtwhsiVAWSIkIafyAU9qo6vmLER0Me+wDycl8suBoCZKUvJ3gw8F+tOwC8Mz3kmhVL l7s+IzP8c0gECvy6s/8jDwS9ku2MpG+wrECMLdnE= Date: Fri, 6 Nov 2020 17:32:04 +0200 From: Jarkko Sakkinen To: Jerry Snitselaar Cc: James Bottomley , linux-integrity@vger.kernel.org, Jason Gunthorpe , Jarkko Sakkinen , Peter Huewe Subject: Re: [PATCH v2 4/5] tpm_tis: fix IRQ probing Message-ID: <20201106153204.GA13531@kernel.org> References: <20201001180925.13808-1-James.Bottomley@HansenPartnership.com> <20201001180925.13808-5-James.Bottomley@HansenPartnership.com> <87zh4hg4wg.fsf@redhat.com> <20201024121718.GC32960@kernel.org> <20201030124335.GD522355@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201030124335.GD522355@kernel.org> Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org On Fri, Oct 30, 2020 at 02:43:35PM +0200, Jarkko Sakkinen wrote: > On Sat, Oct 24, 2020 at 03:17:18PM +0300, Jarkko Sakkinen wrote: > > On Mon, Oct 19, 2020 at 04:41:35PM -0700, Jerry Snitselaar wrote: > > > > > > James Bottomley @ 2020-10-01 11:09 MST: > > > > > > > There are two problems with our current interrupt probing: firstly the > > > > TPM_CHIP_FLAG_IRQ never gets set initially, so a check for interrupts > > > > is never done. Fix this by setting the flag before we generate and > > > > interrupt for probing. Secondly our IRQ setup may be ineffective on a > > > > TPM without legacy access cycles becuase according to the TPM > > > > Interface Specification the interrupt registers are only writeable in > > > > the current locality, so issue a request_locality before setting up > > > > the interrupts. > > > > > > > > Signed-off-by: James Bottomley > > > > > > > > --- > > > > > > > > v2: improved description > > > > --- > > > > drivers/char/tpm/tpm_tis_core.c | 14 ++++++++++++++ > > > > 1 file changed, 14 insertions(+) > > > > > > > > diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c > > > > index 0c07da8cd680..12b657ed3a39 100644 > > > > --- a/drivers/char/tpm/tpm_tis_core.c > > > > +++ b/drivers/char/tpm/tpm_tis_core.c > > > > @@ -809,6 +809,19 @@ static int tpm_tis_probe_irq_single(struct tpm_chip *chip, > > > > } > > > > priv->irq = irq; > > > > > > > > + /* > > > > + * note writes to the interrupt registers are only effective > > > > + * when the TPM is in the active locality, so we have to > > > > + * request the locality here to get the interrupt set up. > > > > + * This request has no corresponding release, because the > > > > + * locality will be relinquished at the end of the tpm command > > > > + * that probes the interrupts > > > > + */ > > > > + if (request_locality(chip, 0) != 0) { > > > > + dev_err(&chip->dev, "failed to gain locality for irq probe\n"); > > > > + return -EBUSY; > > > > + } > > > > Appreciate the comment a lot, but s/note/Note/ > > I tested this with: > > - https://ark.intel.com/content/www/us/en/ark/products/84861/intel-nuc-kit-nuc5i5myhe.html > dTPM 1.2 > - https://ark.intel.com/content/www/us/en/ark/products/74483/intel-nuc-kit-dc53427hye.html > dTPM 2.0 > > I did not get "TPM interrupt not working, polling instead" to klog. > But I neither see tpm0 in /proc/interrupts. What I'm doing wrong? With dTPM2 NUC, I ended up get this when I just pass 'irq=0' to tpm_tis_core_init(): [ 0.584421] tpm_tis MSFT0101:00: 2.0 TPM (device-id 0x1A, rev-id 16) [ 0.680417] genirq: Flags mismatch irq 7. 00000008 (tpm0) vs. 00040088 (INT3432:00) [ 0.680448] tpm tpm0: Unable to request irq: 7 for probe [ 0.704416] genirq: Flags mismatch irq 9. 00000000 (tpm0) vs. 00000080 (acpi) [ 0.704444] tpm tpm0: Unable to request irq: 9 for probe /Jarkko