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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DC4ADC433EF for ; Tue, 16 Nov 2021 00:03:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BA67D63212 for ; Tue, 16 Nov 2021 00:03:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348983AbhKPAGa (ORCPT ); Mon, 15 Nov 2021 19:06:30 -0500 Received: from mail.kernel.org ([198.145.29.99]:45126 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345091AbhKOT0T (ORCPT ); Mon, 15 Nov 2021 14:26:19 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 313006124B; Mon, 15 Nov 2021 19:10:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1637003412; bh=SEH46agP6ZMS85HjcoMU4AlhgQX8KdSJvWw7MBgZVyI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UWx7dXbq5muyN/hlq91Gx+FwoycbGZxfg/4T2AfL1krY65gnfRzzkkDRSOcHwjnYG vBd7MVS5YYEqInjhyHdrjDMsutgiQsq35pC53Lr2Ej//ZbEj1ItEgGso7u5CWNcemM igDRfyTV+Z4IZIVvp6xU5t373HQvrlPB/ITPpzpA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Giovanni Cabiddu , Marco Chiappero , Herbert Xu , Sasha Levin Subject: [PATCH 5.4 213/355] crypto: qat - detect PFVF collision after ACK Date: Mon, 15 Nov 2021 18:02:17 +0100 Message-Id: <20211115165320.655792348@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211115165313.549179499@linuxfoundation.org> References: <20211115165313.549179499@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: Giovanni Cabiddu [ Upstream commit 9b768e8a3909ac1ab39ed44a3933716da7761a6f ] Detect a PFVF collision between the local and the remote function by checking if the message on the PFVF CSR has been overwritten. This is done after the remote function confirms that the message has been received, by clearing the interrupt bit, or the maximum number of attempts (ADF_IOV_MSG_ACK_MAX_RETRY) to check the CSR has been exceeded. Fixes: ed8ccaef52fa ("crypto: qat - Add support for SRIOV") Signed-off-by: Giovanni Cabiddu Co-developed-by: Marco Chiappero Signed-off-by: Marco Chiappero Signed-off-by: Herbert Xu Signed-off-by: Sasha Levin --- drivers/crypto/qat/qat_common/adf_pf2vf_msg.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/crypto/qat/qat_common/adf_pf2vf_msg.c b/drivers/crypto/qat/qat_common/adf_pf2vf_msg.c index c64481160b711..72fd2bbbe704e 100644 --- a/drivers/crypto/qat/qat_common/adf_pf2vf_msg.c +++ b/drivers/crypto/qat/qat_common/adf_pf2vf_msg.c @@ -195,6 +195,13 @@ static int __adf_iov_putmsg(struct adf_accel_dev *accel_dev, u32 msg, u8 vf_nr) val = ADF_CSR_RD(pmisc_bar_addr, pf2vf_offset); } while ((val & int_bit) && (count++ < ADF_IOV_MSG_ACK_MAX_RETRY)); + if (val != msg) { + dev_dbg(&GET_DEV(accel_dev), + "Collision - PFVF CSR overwritten by remote function\n"); + ret = -EIO; + goto out; + } + if (val & int_bit) { dev_dbg(&GET_DEV(accel_dev), "ACK not received from remote\n"); val &= ~int_bit; -- 2.33.0