From patchwork Tue Oct 18 16:04:01 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Pieralisi X-Patchwork-Id: 9382605 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id D930560839 for ; Tue, 18 Oct 2016 16:07:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C8FCA29679 for ; Tue, 18 Oct 2016 16:07:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BD18B2967E; Tue, 18 Oct 2016 16:07:25 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 5A43529679 for ; Tue, 18 Oct 2016 16:07:22 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bwWtS-0006Co-OU; Tue, 18 Oct 2016 16:05:34 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bwWs5-0004Ih-Ra for linux-arm-kernel@lists.infradead.org; Tue, 18 Oct 2016 16:04:13 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 49A451478; Tue, 18 Oct 2016 09:03:53 -0700 (PDT) Received: from red-moon.cambridge.arm.com (red-moon.cambridge.arm.com [10.1.206.55]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 7BEFE3F218; Tue, 18 Oct 2016 09:03:50 -0700 (PDT) From: Lorenzo Pieralisi To: iommu@lists.linux-foundation.org Subject: [PATCH v6 03/16] drivers: acpi: iort: add support for IOMMU fwnode registration Date: Tue, 18 Oct 2016 17:04:01 +0100 Message-Id: <20161018160414.1228-4-lorenzo.pieralisi@arm.com> X-Mailer: git-send-email 2.10.0 In-Reply-To: <20161018160414.1228-1-lorenzo.pieralisi@arm.com> References: <20161018160414.1228-1-lorenzo.pieralisi@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20161018_090410_101158_19591B73 X-CRM114-Status: GOOD ( 13.14 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arm-kernel@lists.infradead.org, Lorenzo Pieralisi , linux-acpi@vger.kernel.org, Marc Zyngier , Tomasz Nowicki , Joerg Roedel , "Rafael J. Wysocki" , linux-kernel@vger.kernel.org, Will Deacon , Sinan Kaya , Eric Auger , linux-pci@vger.kernel.org, Hanjun Guo , Jon Masters , Dennis Chen , Prem Mallappa , Robin Murphy , Nate Watterson MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP The ACPI IORT table provide entries for IOMMU (aka SMMU in ARM world) components that allow creating the kernel data structures required to probe and initialize the IOMMU devices. This patch provides support in the IORT kernel code to register IOMMU components and their respective fwnode. Signed-off-by: Lorenzo Pieralisi Reviewed-by: Hanjun Guo Cc: Hanjun Guo Cc: Tomasz Nowicki Cc: "Rafael J. Wysocki" --- drivers/acpi/arm64/iort.c | 86 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 86 insertions(+) diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index 6b51ca7..75ff7fa 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -20,7 +20,9 @@ #include #include +#include #include +#include struct iort_its_msi_chip { struct list_head list; @@ -28,6 +30,90 @@ struct iort_its_msi_chip { u32 translation_id; }; +struct iort_fwnode { + struct list_head list; + struct acpi_iort_node *iort_node; + struct fwnode_handle *fwnode; +}; +static LIST_HEAD(iort_fwnode_list); +static DEFINE_SPINLOCK(iort_fwnode_lock); + +/** + * iort_set_fwnode() - Create iort_fwnode and use it to register + * iommu data in the iort_fwnode_list + * + * @node: IORT table node associated with the IOMMU + * @fwnode: fwnode associated with the IORT node + * + * Returns: 0 on success + * <0 on failure + */ +static inline int iort_set_fwnode(struct acpi_iort_node *iort_node, + struct fwnode_handle *fwnode) +{ + struct iort_fwnode *np; + + np = kzalloc(sizeof(struct iort_fwnode), GFP_ATOMIC); + + if (WARN_ON(!np)) + return -ENOMEM; + + INIT_LIST_HEAD(&np->list); + np->iort_node = iort_node; + np->fwnode = fwnode; + + spin_lock(&iort_fwnode_lock); + list_add_tail(&np->list, &iort_fwnode_list); + spin_unlock(&iort_fwnode_lock); + + return 0; +} + +/** + * iort_get_fwnode() - Retrieve fwnode associated with an IORT node + * + * @node: IORT table node to be looked-up + * + * Returns: fwnode_handle pointer on success, NULL on failure + */ +static inline +struct fwnode_handle *iort_get_fwnode(struct acpi_iort_node *node) +{ + struct iort_fwnode *curr; + struct fwnode_handle *fwnode = NULL; + + spin_lock(&iort_fwnode_lock); + list_for_each_entry(curr, &iort_fwnode_list, list) { + if (curr->iort_node == node) { + fwnode = curr->fwnode; + break; + } + } + spin_unlock(&iort_fwnode_lock); + + return fwnode; +} + +/** + * iort_delete_fwnode() - Delete fwnode associated with an IORT node + * + * @node: IORT table node associated with fwnode to delete + */ +static inline void iort_delete_fwnode(struct acpi_iort_node *node) +{ + struct iort_fwnode *curr, *tmp; + + spin_lock(&iort_fwnode_lock); + list_for_each_entry_safe(curr, tmp, &iort_fwnode_list, list) { + if (curr->iort_node == node) { + list_del(&curr->list); + kfree(curr); + break; + } + } + spin_unlock(&iort_fwnode_lock); +} + typedef acpi_status (*iort_find_node_callback) (struct acpi_iort_node *node, void *context);