From patchwork Mon May 17 07:47:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kishon Vijay Abraham I X-Patchwork-Id: 12261007 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=-17.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, 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 784D0C433B4 for ; Mon, 17 May 2021 07:51:06 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id ED8AA610FA for ; Mon, 17 May 2021 07:51:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org ED8AA610FA Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=ti.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-ID:Date: Subject:CC:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=no1IUjo/k+2EOrFajLYFpX9N8/RDdx1s9yAcNavIYZI=; b=nJ0BJ1kLo6MsTIvUFqlDciHWU FxqDqVIIvGBOXqFPasvVCgb5lEE3Vm72Gl8bYpmpJyIDTjWdWQSyMcEAPj2IFqRoe1EhviivhdtKg 0aUlBc8PcE99XCLgxzNrvRF5cdTQsT9AGQcENMgiJMCv66D2MjG5CuAoWiLkU37/5BlMy1gCm1o+2 NbhXdxEFCxww1kM2F2n0npbIfSQhl8MsCMNnLhCulOHq1FLGGQm9A4r+Kb0Pwb86kiMmyxp4U+0ah OzDNuTjWl8b7pvVk/ytLJr4EA6zBgSme05mM0PAGxhJsLGx/lAj5mRanRjGO0BJq3CYwtEnthICuV 7BzpTHFyg==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1liXzt-00E5el-FI; Mon, 17 May 2021 07:49:06 +0000 Received: from bombadil.infradead.org ([2607:7c80:54:e::133]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1liXyv-00E5SX-1f; Mon, 17 May 2021 07:48:07 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Type:MIME-Version:References: In-Reply-To:Message-ID:Date:Subject:CC:To:From:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=ljIiCu1d63/Lh8N7BDvq4eA+V0ki7wqenHL/9VwoK2w=; b=13LQXXW9ngLJ/00UiMin3WEuHJ vcb55N8RFGSmFuCjd799T0Q8EKSUpb3ROsmgDFb115418Aqyd6gmf9BS9VIdufMV4TC4EfdlDl6mf AEdK8yjgH7bxUlL+MtxIjAl/5U9X4xAfa6jMTeuEZYmt4U3XcLKj+bTo64SVeqkKetDHYODT1uTEt SV8zR1ymM7ESREIIUdYdmHpRUC5NjBkSMjNfeaE46gnzNscy1xSFV+rsuOiWzuJqO7qPiI+yUqUaT LzmPX6rI+aTgHMK45TVUcDuw83f5opCGHfrbeMpRjqPyW86Q8KAtUQa2VTDVJkXRpGzIjrpNxeW1h d/KH8MQw==; Received: from fllv0015.ext.ti.com ([198.47.19.141]) by bombadil.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1liXys-00DYh2-1N; Mon, 17 May 2021 07:48:03 +0000 Received: from fllv0035.itg.ti.com ([10.64.41.0]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id 14H7lqdr074158; Mon, 17 May 2021 02:47:52 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1621237672; bh=ljIiCu1d63/Lh8N7BDvq4eA+V0ki7wqenHL/9VwoK2w=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=BYA3Yv0KbsuQc7Qickqpg4FejRDkAoIz2FSrrjVFfCg59Du4+i2y1fdmE1bUnYYaN o44Ljc/Jh00F83uYC3kxDdIEjtEDaq+KxvWf0tBE23DHdKU9RUtIhfSkWACdDpCZXb IGAufYtHO91EPSXgLbSh/dSPoHgGWmKnn8HvBquY= Received: from DLEE105.ent.ti.com (dlee105.ent.ti.com [157.170.170.35]) by fllv0035.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 14H7lqHr008064 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 17 May 2021 02:47:52 -0500 Received: from DLEE110.ent.ti.com (157.170.170.21) by DLEE105.ent.ti.com (157.170.170.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2; Mon, 17 May 2021 02:47:52 -0500 Received: from lelv0326.itg.ti.com (10.180.67.84) by DLEE110.ent.ti.com (157.170.170.21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2 via Frontend Transport; Mon, 17 May 2021 02:47:52 -0500 Received: from a0393678-ssd.dhcp.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0326.itg.ti.com (8.15.2/8.15.2) with ESMTP id 14H7lOcf007607; Mon, 17 May 2021 02:47:45 -0500 From: Kishon Vijay Abraham I To: Lorenzo Pieralisi , Bjorn Helgaas , Rob Herring , Tom Joseph , Jingoo Han , Gustavo Pimentel , Marek Vasut , Yoshihiro Shimoda , Shawn Lin , Heiko Stuebner CC: Jonathan Corbet , Arnd Bergmann , Greg Kroah-Hartman , , , , , , , , Kishon Vijay Abraham I , Lokesh Vutla Subject: [PATCH v6 2/7] PCI: endpoint: Add support to add virtual function in endpoint core Date: Mon, 17 May 2021 13:17:18 +0530 Message-ID: <20210517074723.10212-3-kishon@ti.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210517074723.10212-1-kishon@ti.com> References: <20210517074723.10212-1-kishon@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210517_004802_186591_54F5F5DC X-CRM114-Status: GOOD ( 23.58 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add support to add virtual function in endpoint core. The virtual function can only be associated with a physical function instead of a endpoint controller. Provide APIs to associate a virtual function with a physical function here. Signed-off-by: Kishon Vijay Abraham I --- drivers/pci/endpoint/pci-epc-core.c | 2 +- drivers/pci/endpoint/pci-epf-core.c | 96 ++++++++++++++++++++++++++++- include/linux/pci-epf.h | 16 ++++- 3 files changed, 111 insertions(+), 3 deletions(-) diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c index adec9bee72cf..01c58ca84dcc 100644 --- a/drivers/pci/endpoint/pci-epc-core.c +++ b/drivers/pci/endpoint/pci-epc-core.c @@ -548,7 +548,7 @@ int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf, u32 func_no; int ret = 0; - if (IS_ERR_OR_NULL(epc)) + if (IS_ERR_OR_NULL(epc) || epf->is_vf) return -EINVAL; if (type == PRIMARY_INTERFACE && epf->epc) diff --git a/drivers/pci/endpoint/pci-epf-core.c b/drivers/pci/endpoint/pci-epf-core.c index e9289d10f822..ae7107a3196e 100644 --- a/drivers/pci/endpoint/pci-epf-core.c +++ b/drivers/pci/endpoint/pci-epf-core.c @@ -62,13 +62,20 @@ EXPORT_SYMBOL_GPL(pci_epf_type_add_cfs); */ void pci_epf_unbind(struct pci_epf *epf) { + struct pci_epf *epf_vf; + if (!epf->driver) { dev_WARN(&epf->dev, "epf device not bound to driver\n"); return; } mutex_lock(&epf->lock); - epf->driver->ops->unbind(epf); + list_for_each_entry(epf_vf, &epf->pci_vepf, list) { + if (epf_vf->is_bound) + epf_vf->driver->ops->unbind(epf_vf); + } + if (epf->is_bound) + epf->driver->ops->unbind(epf); mutex_unlock(&epf->lock); module_put(epf->driver->owner); } @@ -83,6 +90,7 @@ EXPORT_SYMBOL_GPL(pci_epf_unbind); */ int pci_epf_bind(struct pci_epf *epf) { + struct pci_epf *epf_vf; int ret; if (!epf->driver) { @@ -94,13 +102,95 @@ int pci_epf_bind(struct pci_epf *epf) return -EAGAIN; mutex_lock(&epf->lock); + list_for_each_entry(epf_vf, &epf->pci_vepf, list) { + epf_vf->func_no = epf->func_no; + epf_vf->epc = epf->epc; + epf_vf->sec_epc = epf->sec_epc; + ret = epf_vf->driver->ops->bind(epf_vf); + if (ret) + goto ret; + epf_vf->is_bound = true; + } + ret = epf->driver->ops->bind(epf); + if (ret) + goto ret; + epf->is_bound = true; + + mutex_unlock(&epf->lock); + return 0; + +ret: mutex_unlock(&epf->lock); + pci_epf_unbind(epf); return ret; } EXPORT_SYMBOL_GPL(pci_epf_bind); +/** + * pci_epf_add_vepf() - associate virtual EP function to physical EP function + * @epf_pf: the physical EP function to which the virtual EP function should be + * associated + * @epf_vf: the virtual EP function to be added + * + * A physical endpoint function can be associated with multiple virtual + * endpoint functions. Invoke pci_epf_add_epf() to add a virtual PCI endpoint + * function to a physical PCI endpoint function. + */ +int pci_epf_add_vepf(struct pci_epf *epf_pf, struct pci_epf *epf_vf) +{ + u32 vfunc_no; + + if (IS_ERR_OR_NULL(epf_pf) || IS_ERR_OR_NULL(epf_vf)) + return -EINVAL; + + if (epf_pf->epc || epf_vf->epc || epf_vf->epf_pf) + return -EBUSY; + + if (epf_pf->sec_epc || epf_vf->sec_epc) + return -EBUSY; + + mutex_lock(&epf_pf->lock); + vfunc_no = find_first_zero_bit(&epf_pf->vfunction_num_map, + BITS_PER_LONG); + if (vfunc_no >= BITS_PER_LONG) + return -EINVAL; + + set_bit(vfunc_no, &epf_pf->vfunction_num_map); + epf_vf->vfunc_no = vfunc_no; + + epf_vf->epf_pf = epf_pf; + epf_vf->is_vf = true; + + list_add_tail(&epf_vf->list, &epf_pf->pci_vepf); + mutex_unlock(&epf_pf->lock); + + return 0; +} +EXPORT_SYMBOL_GPL(pci_epf_add_vepf); + +/** + * pci_epf_remove_vepf() - remove virtual EP function from physical EP function + * @epf_pf: the physical EP function from which the virtual EP function should + * be removed + * @epf_vf: the virtual EP function to be removed + * + * Invoke to remove a virtual endpoint function from the physcial endpoint + * function. + */ +void pci_epf_remove_vepf(struct pci_epf *epf_pf, struct pci_epf *epf_vf) +{ + if (IS_ERR_OR_NULL(epf_pf) || IS_ERR_OR_NULL(epf_vf)) + return; + + mutex_lock(&epf_pf->lock); + clear_bit(epf_vf->vfunc_no, &epf_pf->vfunction_num_map); + list_del(&epf_vf->list); + mutex_unlock(&epf_pf->lock); +} +EXPORT_SYMBOL_GPL(pci_epf_remove_vepf); + /** * pci_epf_free_space() - free the allocated PCI EPF register space * @epf: the EPF device from whom to free the memory @@ -317,6 +407,10 @@ struct pci_epf *pci_epf_create(const char *name) return ERR_PTR(-ENOMEM); } + /* VFs are numbered starting with 1. So set BIT(0) by default */ + epf->vfunction_num_map = 1; + INIT_LIST_HEAD(&epf->pci_vepf); + dev = &epf->dev; device_initialize(dev); dev->bus = &pci_epf_bus_type; diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h index 6833e2160ef1..1de8fb72ce20 100644 --- a/include/linux/pci-epf.h +++ b/include/linux/pci-epf.h @@ -118,8 +118,10 @@ struct pci_epf_bar { * @header: represents standard configuration header * @bar: represents the BAR of EPF device * @msi_interrupts: number of MSI interrupts required by this function - * @func_no: unique function number within this endpoint device + * @func_no: unique (physical) function number within this endpoint device + * @vfunc_no: unique virtual function number within a physical function * @epc: the EPC device to which this EPF device is bound + * @epf_pf: the physical EPF device to which this virtual EPF device is bound * @driver: the EPF driver to which this EPF device is bound * @list: to add pci_epf as a list of PCI endpoint functions to pci_epc * @nb: notifier block to notify EPF of any EPC events (like linkup) @@ -130,6 +132,10 @@ struct pci_epf_bar { * @sec_epc_bar: represents the BAR of EPF device associated with secondary EPC * @sec_epc_func_no: unique (physical) function number within the secondary EPC * @group: configfs group associated with the EPF device + * @is_bound: indicates if bind notification to function driver has been invoked + * @is_vf: true - virtual function, false - physical function + * @vfunction_num_map: bitmap to manage virtual function number + * @pci_vepf: list of virtual endpoint functions associated with this function */ struct pci_epf { struct device dev; @@ -139,8 +145,10 @@ struct pci_epf { u8 msi_interrupts; u16 msix_interrupts; u8 func_no; + u8 vfunc_no; struct pci_epc *epc; + struct pci_epf *epf_pf; struct pci_epf_driver *driver; struct list_head list; struct notifier_block nb; @@ -153,6 +161,10 @@ struct pci_epf { struct pci_epf_bar sec_epc_bar[6]; u8 sec_epc_func_no; struct config_group *group; + unsigned int is_bound; + unsigned int is_vf; + unsigned long vfunction_num_map; + struct list_head pci_vepf; }; /** @@ -196,4 +208,6 @@ int pci_epf_bind(struct pci_epf *epf); void pci_epf_unbind(struct pci_epf *epf); struct config_group *pci_epf_type_add_cfs(struct pci_epf *epf, struct config_group *group); +int pci_epf_add_vepf(struct pci_epf *epf_pf, struct pci_epf *epf_vf); +void pci_epf_remove_vepf(struct pci_epf *epf_pf, struct pci_epf *epf_vf); #endif /* __LINUX_PCI_EPF_H */