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From: Kishon Vijay Abraham I <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>
Subject: [PATCH 1/7] Documentation: PCI: endpoint/pci-endpoint-cfs: Guide to use SR-IOV
Date: Tue, 31 Dec 2019 17:05:28 +0530
Message-ID: <20191231113534.30405-2-kishon@ti.com> (raw)
In-Reply-To: <20191231113534.30405-1-kishon@ti.com>

Add Documentation to help users use PCI endpoint to create virtual
functions using configfs. An endpoint function is designated as a
virtual endpoint function device when it is linked to a physical
endpoint function device (instead of a endpoint controller).

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 Documentation/PCI/endpoint/pci-endpoint-cfs.rst | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/Documentation/PCI/endpoint/pci-endpoint-cfs.rst b/Documentation/PCI/endpoint/pci-endpoint-cfs.rst
index b6d39cdec56e..0f55c5511c6c 100644
--- a/Documentation/PCI/endpoint/pci-endpoint-cfs.rst
+++ b/Documentation/PCI/endpoint/pci-endpoint-cfs.rst
@@ -43,6 +43,7 @@ entries corresponding to EPF driver will be created by the EPF core.
 		.. <EPF Driver1>/
 			... <EPF Device 11>/
 			... <EPF Device 21>/
+			... <EPF Device 31>/
 		.. <EPF Driver2>/
 			... <EPF Device 12>/
 			... <EPF Device 22>/
@@ -68,6 +69,14 @@ created)
 				... subsys_vendor_id
 				... subsys_id
 				... interrupt_pin
+			        ... <Symlink EPF Device 31>/
+
+The <EPF Device> directory can have a list of symbolic links to
+other <EPF Device>. These symbolic links should be created by the user
+to represent the virtual functions that are bound to the physical
+function. In the above directory structure <EPF Device 11> is a physical
+function and <EPF Device 31> is a virtual function. A EPF device once it's
+linked to another EPF device, cannot be linked to a EPC device.
 
 EPC Device
 ==========
@@ -88,7 +97,8 @@ entries corresponding to EPC device will be created by the EPC core.
 
 The <EPC Device> directory will have a list of symbolic links to
 <EPF Device>. These symbolic links should be created by the user to
-represent the functions present in the endpoint device.
+represent the functions present in the endpoint device. Only <EPF Device>
+that represents a physical function can be linked to a EPC device.
 
 The <EPC Device> directory will also have a *start* field. Once
 "1" is written to this field, the endpoint device will be ready to
-- 
2.17.1


  reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-31 11:35 [PATCH 0/7] Add SR-IOV support in PCIe Endpoint Core Kishon Vijay Abraham I
2019-12-31 11:35 ` Kishon Vijay Abraham I [this message]
2019-12-31 11:35 ` [PATCH 2/7] dt-bindings: PCI: cadence: Add binding to specify max virtual functions Kishon Vijay Abraham I
2020-01-15  1:40   ` Rob Herring
2020-01-16 11:29     ` Kishon Vijay Abraham I
2019-12-31 11:35 ` [PATCH 3/7] PCI: endpoint: Add support to add virtual function in endpoint core Kishon Vijay Abraham I
2019-12-31 11:35 ` [PATCH 4/7] PCI: endpoint: Add support to link a physical function to a virtual function Kishon Vijay Abraham I
2019-12-31 11:35 ` [PATCH 5/7] PCI: endpoint: Add virtual function number in pci_epc ops Kishon Vijay Abraham I
2019-12-31 11:35 ` [PATCH 6/7] PCI: cadence: Add support to configure virtual functions Kishon Vijay Abraham I
2019-12-31 11:35 ` [PATCH 7/7] misc: pci_endpoint_test: Populate sriov_configure ops to configure SR-IOV device Kishon Vijay Abraham I

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