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=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT 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 722AEC433EC for ; Wed, 15 Jul 2020 19:46:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4232320657 for ; Wed, 15 Jul 2020 19:46:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="QUIDlGGm" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727858AbgGOTq6 (ORCPT ); Wed, 15 Jul 2020 15:46:58 -0400 Received: from smtp-fw-2101.amazon.com ([72.21.196.25]:25127 "EHLO smtp-fw-2101.amazon.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726852AbgGOTq5 (ORCPT ); Wed, 15 Jul 2020 15:46:57 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1594842416; x=1626378416; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=jBFz3JyD+ktSHGjIufQ6SCKpoNFYh1Mny1rhW34gR2k=; b=QUIDlGGm4NzyOgbFMwrdId9tk3WTln/F9GsPbGcZD3U4roAezW7x66sc wvPUKBPq+4zefFkaQp30OmRe6JVORa0dhK4p2q7uR1lPdjUtvT68qsw7r mAJtrx9xqggxKtnCt87JxX5ScBi9yl9RqciooKKeogS2L+OjGtD3MA1cK c=; IronPort-SDR: Dqe7VBTO+p4kEv4xuChF8KoAd8rNyBTbGSD2mECUsIot6x0D7vcJTL3tLPsCqY2AK52NT2gCAB 9V4N5TVXXorw== X-IronPort-AV: E=Sophos;i="5.75,356,1589241600"; d="scan'208";a="42071558" Received: from iad12-co-svc-p1-lb1-vlan2.amazon.com (HELO email-inbound-relay-2c-c6afef2e.us-west-2.amazon.com) ([10.43.8.2]) by smtp-border-fw-out-2101.iad2.amazon.com with ESMTP; 15 Jul 2020 19:46:54 +0000 Received: from EX13MTAUEA002.ant.amazon.com (pdx4-ws-svc-p6-lb7-vlan2.pdx.amazon.com [10.170.41.162]) by email-inbound-relay-2c-c6afef2e.us-west-2.amazon.com (Postfix) with ESMTPS id 25267A262D; Wed, 15 Jul 2020 19:46:52 +0000 (UTC) Received: from EX13D16EUB001.ant.amazon.com (10.43.166.28) by EX13MTAUEA002.ant.amazon.com (10.43.61.77) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 15 Jul 2020 19:46:51 +0000 Received: from 38f9d34ed3b1.ant.amazon.com (10.43.161.214) by EX13D16EUB001.ant.amazon.com (10.43.166.28) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 15 Jul 2020 19:46:41 +0000 From: Andra Paraschiv To: CC: Anthony Liguori , Benjamin Herrenschmidt , Colm MacCarthaigh , "David Duncan" , Bjoern Doebel , "David Woodhouse" , Frank van der Linden , Alexander Graf , Greg KH , "Karen Noel" , Martin Pohlack , Matt Wilson , Paolo Bonzini , Balbir Singh , Stefano Garzarella , "Stefan Hajnoczi" , Stewart Smith , "Uwe Dannowski" , Vitaly Kuznetsov , , , Andra Paraschiv , kbuild test robot Subject: [PATCH v5 05/18] nitro_enclaves: Handle PCI device command requests Date: Wed, 15 Jul 2020 22:45:27 +0300 Message-ID: <20200715194540.45532-6-andraprs@amazon.com> X-Mailer: git-send-email 2.20.1 (Apple Git-117) In-Reply-To: <20200715194540.45532-1-andraprs@amazon.com> References: <20200715194540.45532-1-andraprs@amazon.com> MIME-Version: 1.0 X-Originating-IP: [10.43.161.214] X-ClientProxiedBy: EX13D46UWB001.ant.amazon.com (10.43.161.16) To EX13D16EUB001.ant.amazon.com (10.43.166.28) Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The Nitro Enclaves PCI device exposes a MMIO space that this driver uses to submit command requests and to receive command replies e.g. for enclave creation / termination or setting enclave resources. Add logic for handling PCI device command requests based on the given command type. Register an MSI-X interrupt vector for command reply notifications to handle this type of communication events. Signed-off-by: Alexandru-Catalin Vasile Signed-off-by: Andra Paraschiv Fix issue reported in: https://lore.kernel.org/lkml/202004231644.xTmN4Z1z%25lkp@intel.com/ Reported-by: kbuild test robot Signed-off-by: Andra Paraschiv --- Changelog v4 -> v5 * Remove sanity checks for situations that shouldn't happen, only if buggy system or broken logic at all. v3 -> v4 * Use dev_err instead of custom NE log pattern. * Return IRQ_NONE when interrupts are not handled. v2 -> v3 * Remove the WARN_ON calls. * Update static calls sanity checks. * Remove "ratelimited" from the logs that are not in the ioctl call paths. v1 -> v2 * Add log pattern for NE. * Remove the BUG_ON calls. * Update goto labels to match their purpose. * Add fix for kbuild report. --- drivers/virt/nitro_enclaves/ne_pci_dev.c | 202 +++++++++++++++++++++++ 1 file changed, 202 insertions(+) diff --git a/drivers/virt/nitro_enclaves/ne_pci_dev.c b/drivers/virt/nitro_enclaves/ne_pci_dev.c index dd23caecd57d..738b8f4d8faf 100644 --- a/drivers/virt/nitro_enclaves/ne_pci_dev.c +++ b/drivers/virt/nitro_enclaves/ne_pci_dev.c @@ -27,6 +27,185 @@ static const struct pci_device_id ne_pci_ids[] = { MODULE_DEVICE_TABLE(pci, ne_pci_ids); +/** + * ne_submit_request - Submit command request to the PCI device based on the + * command type. + * + * This function gets called with the ne_pci_dev mutex held. + * + * @pdev: PCI device to send the command to. + * @cmd_type: command type of the request sent to the PCI device. + * @cmd_request: command request payload. + * @cmd_request_size: size of the command request payload. + * + * @returns: 0 on success, negative return value on failure. + */ +static int ne_submit_request(struct pci_dev *pdev, enum ne_pci_dev_cmd_type cmd_type, + void *cmd_request, size_t cmd_request_size) +{ + struct ne_pci_dev *ne_pci_dev = pci_get_drvdata(pdev); + + memcpy_toio(ne_pci_dev->iomem_base + NE_SEND_DATA, cmd_request, cmd_request_size); + + iowrite32(cmd_type, ne_pci_dev->iomem_base + NE_COMMAND); + + return 0; +} + +/** + * ne_retrieve_reply - Retrieve reply from the PCI device. + * + * This function gets called with the ne_pci_dev mutex held. + * + * @pdev: PCI device to receive the reply from. + * @cmd_reply: command reply payload. + * @cmd_reply_size: size of the command reply payload. + * + * @returns: 0 on success, negative return value on failure. + */ +static int ne_retrieve_reply(struct pci_dev *pdev, struct ne_pci_dev_cmd_reply *cmd_reply, + size_t cmd_reply_size) +{ + struct ne_pci_dev *ne_pci_dev = pci_get_drvdata(pdev); + + memcpy_fromio(cmd_reply, ne_pci_dev->iomem_base + NE_RECV_DATA, cmd_reply_size); + + return 0; +} + +/** + * ne_wait_for_reply - Wait for a reply of a PCI command. + * + * This function gets called with the ne_pci_dev mutex held. + * + * @pdev: PCI device for which a reply is waited. + * + * @returns: 0 on success, negative return value on failure. + */ +static int ne_wait_for_reply(struct pci_dev *pdev) +{ + struct ne_pci_dev *ne_pci_dev = pci_get_drvdata(pdev); + int rc = -EINVAL; + + /* + * TODO: Update to _interruptible and handle interrupted wait event + * e.g. -ERESTARTSYS, incoming signals + add / update timeout. + */ + rc = wait_event_timeout(ne_pci_dev->cmd_reply_wait_q, + atomic_read(&ne_pci_dev->cmd_reply_avail) != 0, + msecs_to_jiffies(NE_DEFAULT_TIMEOUT_MSECS)); + if (!rc) + return -ETIMEDOUT; + + return 0; +} + +int ne_do_request(struct pci_dev *pdev, enum ne_pci_dev_cmd_type cmd_type, + void *cmd_request, size_t cmd_request_size, + struct ne_pci_dev_cmd_reply *cmd_reply, size_t cmd_reply_size) +{ + struct ne_pci_dev *ne_pci_dev = pci_get_drvdata(pdev); + int rc = -EINVAL; + + if (cmd_type <= INVALID_CMD || cmd_type >= MAX_CMD) { + dev_err_ratelimited(&pdev->dev, "Invalid cmd type=%u\n", cmd_type); + + return -EINVAL; + } + + if (!cmd_request) { + dev_err_ratelimited(&pdev->dev, "Null cmd request\n"); + + return -EINVAL; + } + + if (cmd_request_size > NE_SEND_DATA_SIZE) { + dev_err_ratelimited(&pdev->dev, "Invalid req size=%zu for cmd type=%u\n", + cmd_request_size, cmd_type); + + return -EINVAL; + } + + if (!cmd_reply) { + dev_err_ratelimited(&pdev->dev, "Null cmd reply\n"); + + return -EINVAL; + } + + if (cmd_reply_size > NE_RECV_DATA_SIZE) { + dev_err_ratelimited(&pdev->dev, "Invalid reply size=%zu\n", cmd_reply_size); + + return -EINVAL; + } + + /* + * Use this mutex so that the PCI device handles one command request at + * a time. + */ + mutex_lock(&ne_pci_dev->pci_dev_mutex); + + atomic_set(&ne_pci_dev->cmd_reply_avail, 0); + + rc = ne_submit_request(pdev, cmd_type, cmd_request, cmd_request_size); + if (rc < 0) { + dev_err_ratelimited(&pdev->dev, "Error in submit request [rc=%d]\n", rc); + + goto unlock_mutex; + } + + rc = ne_wait_for_reply(pdev); + if (rc < 0) { + dev_err_ratelimited(&pdev->dev, "Error in wait for reply [rc=%d]\n", rc); + + goto unlock_mutex; + } + + rc = ne_retrieve_reply(pdev, cmd_reply, cmd_reply_size); + if (rc < 0) { + dev_err_ratelimited(&pdev->dev, "Error in retrieve reply [rc=%d]\n", rc); + + goto unlock_mutex; + } + + atomic_set(&ne_pci_dev->cmd_reply_avail, 0); + + if (cmd_reply->rc < 0) { + rc = cmd_reply->rc; + + dev_err_ratelimited(&pdev->dev, "Error in cmd process logic [rc=%d]\n", rc); + + goto unlock_mutex; + } + + rc = 0; + +unlock_mutex: + mutex_unlock(&ne_pci_dev->pci_dev_mutex); + + return rc; +} + +/** + * ne_reply_handler - Interrupt handler for retrieving a reply matching + * a request sent to the PCI device for enclave lifetime management. + * + * @irq: received interrupt for a reply sent by the PCI device. + * @args: PCI device private data structure. + * + * @returns: IRQ_HANDLED on handled interrupt, IRQ_NONE otherwise. + */ +static irqreturn_t ne_reply_handler(int irq, void *args) +{ + struct ne_pci_dev *ne_pci_dev = (struct ne_pci_dev *)args; + + atomic_set(&ne_pci_dev->cmd_reply_avail, 1); + + /* TODO: Update to _interruptible. */ + wake_up(&ne_pci_dev->cmd_reply_wait_q); + + return IRQ_HANDLED; +} + /** * ne_setup_msix - Setup MSI-X vectors for the PCI device. * @@ -36,6 +215,7 @@ MODULE_DEVICE_TABLE(pci, ne_pci_ids); */ static int ne_setup_msix(struct pci_dev *pdev) { + struct ne_pci_dev *ne_pci_dev = pci_get_drvdata(pdev); int nr_vecs = 0; int rc = -EINVAL; @@ -55,7 +235,25 @@ static int ne_setup_msix(struct pci_dev *pdev) return rc; } + /* + * This IRQ gets triggered every time the PCI device responds to a + * command request. The reply is then retrieved, reading from the MMIO + * space of the PCI device. + */ + rc = request_irq(pci_irq_vector(pdev, NE_VEC_REPLY), ne_reply_handler, + 0, "enclave_cmd", ne_pci_dev); + if (rc < 0) { + dev_err(&pdev->dev, "Error in request irq reply [rc=%d]\n", rc); + + goto free_irq_vectors; + } + return 0; + +free_irq_vectors: + pci_free_irq_vectors(pdev); + + return rc; } /** @@ -65,6 +263,10 @@ static int ne_setup_msix(struct pci_dev *pdev) */ static void ne_teardown_msix(struct pci_dev *pdev) { + struct ne_pci_dev *ne_pci_dev = pci_get_drvdata(pdev); + + free_irq(pci_irq_vector(pdev, NE_VEC_REPLY), ne_pci_dev); + pci_free_irq_vectors(pdev); } -- 2.20.1 (Apple Git-117) Amazon Development Center (Romania) S.R.L. registered office: 27A Sf. Lazar Street, UBC5, floor 2, Iasi, Iasi County, 700045, Romania. Registered in Romania. Registration number J22/2621/2005.