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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7D58CC352A8 for ; Tue, 5 Apr 2022 10:08:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350774AbiDEJ7q (ORCPT ); Tue, 5 Apr 2022 05:59:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53312 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240012AbiDEIWM (ORCPT ); Tue, 5 Apr 2022 04:22:12 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 029522BDA; Tue, 5 Apr 2022 01:19:36 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 587D9609D0; Tue, 5 Apr 2022 08:19:36 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 60106C385A1; Tue, 5 Apr 2022 08:19:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1649146775; bh=gLx6LyEARQOPG7EoCVpdTIUT4WgJnC0gWdY0sjo1HKo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xt478UPJIelN95JpjNch9NVNNL7OvIVuVZLQhl56mB7nLdMV0Zj8PPpZri6n0pUTC /88ZQlkFT0VPLvgJLbocr4rVjOcOWgyR3WB5SFcUL/tqwIupZN58+EYtFzi/DC087P 7r6teU6pXOTGZ2skWfOoJf99SPe8ozEz49lBihAU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Srujana Challa , Shijith Thotton , Herbert Xu , Sasha Levin Subject: [PATCH 5.17 0836/1126] crypto: octeontx2 - CN10K CPT to RNM workaround Date: Tue, 5 Apr 2022 09:26:23 +0200 Message-Id: <20220405070432.095684505@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220405070407.513532867@linuxfoundation.org> References: <20220405070407.513532867@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Srujana Challa [ Upstream commit bd9305b0cb69bfe98885a63a9e6231ae92e822e2 ] When software sets CPT_AF_CTL[RNM_REQ_EN]=1 and RNM in not producing entropy(i.e., RNM_ENTROPY_STATUS[NORMAL_CNT] < 0x40), the first cycle of the response may be lost due to a conditional clocking issue. Due to this, the subsequent random number stream will be corrupted. So, this patch adds support to ensure RNM_ENTROPY_STATUS[NORMAL_CNT] = 0x40 before writing CPT_AF_CTL[RNM_REQ_EN] = 1, as a workaround. Signed-off-by: Srujana Challa Signed-off-by: Shijith Thotton Signed-off-by: Herbert Xu Signed-off-by: Sasha Levin --- .../marvell/octeontx2/otx2_cptpf_ucode.c | 43 ++++++++++++++++++- 1 file changed, 42 insertions(+), 1 deletion(-) diff --git a/drivers/crypto/marvell/octeontx2/otx2_cptpf_ucode.c b/drivers/crypto/marvell/octeontx2/otx2_cptpf_ucode.c index 1b4d425bbf0e..7fd4503d9cfc 100644 --- a/drivers/crypto/marvell/octeontx2/otx2_cptpf_ucode.c +++ b/drivers/crypto/marvell/octeontx2/otx2_cptpf_ucode.c @@ -1076,6 +1076,39 @@ static void delete_engine_grps(struct pci_dev *pdev, delete_engine_group(&pdev->dev, &eng_grps->grp[i]); } +#define PCI_DEVID_CN10K_RNM 0xA098 +#define RNM_ENTROPY_STATUS 0x8 + +static void rnm_to_cpt_errata_fixup(struct device *dev) +{ + struct pci_dev *pdev; + void __iomem *base; + int timeout = 5000; + + pdev = pci_get_device(PCI_VENDOR_ID_CAVIUM, PCI_DEVID_CN10K_RNM, NULL); + if (!pdev) + return; + + base = pci_ioremap_bar(pdev, 0); + if (!base) + goto put_pdev; + + while ((readq(base + RNM_ENTROPY_STATUS) & 0x7F) != 0x40) { + cpu_relax(); + udelay(1); + timeout--; + if (!timeout) { + dev_warn(dev, "RNM is not producing entropy\n"); + break; + } + } + + iounmap(base); + +put_pdev: + pci_dev_put(pdev); +} + int otx2_cpt_get_eng_grp(struct otx2_cpt_eng_grps *eng_grps, int eng_type) { @@ -1189,9 +1222,17 @@ int otx2_cpt_create_eng_grps(struct otx2_cptpf_dev *cptpf, if (is_dev_otx2(pdev)) goto unlock; + + /* + * Ensure RNM_ENTROPY_STATUS[NORMAL_CNT] = 0x40 before writing + * CPT_AF_CTL[RNM_REQ_EN] = 1 as a workaround for HW errata. + */ + rnm_to_cpt_errata_fixup(&pdev->dev); + /* * Configure engine group mask to allow context prefetching - * for the groups. + * for the groups and enable random number request, to enable + * CPT to request random numbers from RNM. */ otx2_cpt_write_af_reg(&cptpf->afpf_mbox, pdev, CPT_AF_CTL, OTX2_CPT_ALL_ENG_GRPS_MASK << 3 | BIT_ULL(16), -- 2.34.1