From patchwork Tue Dec 31 11:35:31 2019
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Subject: [4/7] PCI: endpoint: Add support to link a physical function to a
 virtual function
X-Patchwork-Submitter: Kishon Vijay Abraham I <kishon@ti.com>
X-Patchwork-Id: 182676
Message-Id: <20191231113534.30405-5-kishon@ti.com>
To: Kishon Vijay Abraham I <kishon@ti.com>,
 Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
 Bjorn Helgaas <bhelgaas@google.com>,
 Andrew Murray <andrew.murray@arm.com>, Tom Joseph <tjoseph@cadence.com>,
 Rob Herring <robh+dt@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
 Jingoo Han <jingoohan1@gmail.com>,
 Gustavo Pimentel <gustavo.pimentel@synopsys.com>,
 Shawn Lin <shawn.lin@rock-chips.com>, Heiko Stuebner <heiko@sntech.de>
Cc: <linux-pci@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
 Jonathan Corbet <corbet@lwn.net>,
 Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
 <linux-doc@vger.kernel.org>, <devicetree@vger.kernel.org>,
 <linux-rockchip@lists.infradead.org>,
 <linux-arm-kernel@lists.infradead.org>
Date: Tue, 31 Dec 2019 17:05:31 +0530
From: Kishon Vijay Abraham I <kishon@ti.com>
List-Id: <linux-kernel.vger.kernel.org>

While the physical function has to be linked to endpoint controller, the
virtual function has to be linked to a physical function. Add support to
link a physical function to a virtual function in pci-ep-cfs.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 drivers/pci/endpoint/pci-ep-cfs.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

-- 
2.17.1

diff --git a/drivers/pci/endpoint/pci-ep-cfs.c b/drivers/pci/endpoint/pci-ep-cfs.c
index e7e8367eead1..c18ef626ada5 100644
--- a/drivers/pci/endpoint/pci-ep-cfs.c
+++ b/drivers/pci/endpoint/pci-ep-cfs.c
@@ -350,6 +350,28 @@ static struct configfs_attribute *pci_epf_attrs[] = {
 	NULL,
 };
 
+static int pci_epf_vepf_link(struct config_item *epf_pf_item,
+			     struct config_item *epf_vf_item)
+{
+	struct pci_epf_group *epf_vf_group = to_pci_epf_group(epf_vf_item);
+	struct pci_epf_group *epf_pf_group = to_pci_epf_group(epf_pf_item);
+	struct pci_epf *epf_pf = epf_pf_group->epf;
+	struct pci_epf *epf_vf = epf_vf_group->epf;
+
+	return pci_epf_add_vepf(epf_pf, epf_vf);
+}
+
+static void pci_epf_vepf_unlink(struct config_item *epf_pf_item,
+				struct config_item *epf_vf_item)
+{
+	struct pci_epf_group *epf_vf_group = to_pci_epf_group(epf_vf_item);
+	struct pci_epf_group *epf_pf_group = to_pci_epf_group(epf_pf_item);
+	struct pci_epf *epf_pf = epf_pf_group->epf;
+	struct pci_epf *epf_vf = epf_vf_group->epf;
+
+	pci_epf_remove_vepf(epf_pf, epf_vf);
+}
+
 static void pci_epf_release(struct config_item *item)
 {
 	struct pci_epf_group *epf_group = to_pci_epf_group(item);
@@ -362,6 +384,8 @@ static void pci_epf_release(struct config_item *item)
 }
 
 static struct configfs_item_operations pci_epf_ops = {
+	.allow_link		= pci_epf_vepf_link,
+	.drop_link		= pci_epf_vepf_unlink,
 	.release		= pci_epf_release,
 };