Date:   Tue, 14 May 2019 22:35:13 +0800
From:   Changbin Du <changbin.du@...il.com>
To:     Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Cc:     Changbin Du <changbin.du@...il.com>, bhelgaas@...gle.com,
        corbet@....net, linux-pci@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 09/12] Documentation: PCI: convert
 endpoint/pci-endpoint.txt to reST

On Mon, May 13, 2019 at 12:01:54PM -0300, Mauro Carvalho Chehab wrote:
> Em Mon, 13 May 2019 22:19:57 +0800
> Changbin Du <changbin.du@...il.com> escreveu:
> 
> > This converts the plain text documentation to reStructuredText format and
> > add it to Sphinx TOC tree. No essential content change.
> > 
> > Signed-off-by: Changbin Du <changbin.du@...il.com>
> > Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>
> > ---
> >  Documentation/PCI/endpoint/index.rst          | 10 ++
> >  .../{pci-endpoint.txt => pci-endpoint.rst}    | 96 +++++++++++--------
> >  Documentation/PCI/index.rst                   |  1 +
> >  3 files changed, 69 insertions(+), 38 deletions(-)
> >  create mode 100644 Documentation/PCI/endpoint/index.rst
> >  rename Documentation/PCI/endpoint/{pci-endpoint.txt => pci-endpoint.rst} (82%)
> > 
> > diff --git a/Documentation/PCI/endpoint/index.rst b/Documentation/PCI/endpoint/index.rst
> > new file mode 100644
> > index 000000000000..0db4f2fcd7f0
> > --- /dev/null
> > +++ b/Documentation/PCI/endpoint/index.rst
> > @@ -0,0 +1,10 @@
> > +.. SPDX-License-Identifier: GPL-2.0
> > +
> > +======================
> > +PCI Endpoint Framework
> > +======================
> > +
> > +.. toctree::
> > +   :maxdepth: 2
> > +
> > +   pci-endpoint
> > diff --git a/Documentation/PCI/endpoint/pci-endpoint.txt b/Documentation/PCI/endpoint/pci-endpoint.rst
> > similarity index 82%
> > rename from Documentation/PCI/endpoint/pci-endpoint.txt
> > rename to Documentation/PCI/endpoint/pci-endpoint.rst
> > index e86a96b66a6a..693f3a2ad7a4 100644
> > --- a/Documentation/PCI/endpoint/pci-endpoint.txt
> > +++ b/Documentation/PCI/endpoint/pci-endpoint.rst
> > @@ -1,11 +1,17 @@
> > -			    PCI ENDPOINT FRAMEWORK
> > -		    Kishon Vijay Abraham I <kishon@...com>
> > +.. SPDX-License-Identifier: GPL-2.0
> > +
> > +======================
> > +PCI Endpoint Framework
> > +======================
> 
> This will create a chapter called: "PCI Endpoint Framework" inside a
> section named "PCI Endpoint Framework". This is redundant.
> 
> Just remove the title here keeping it only at the index file.
> 
> With such change:
> 	Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
>
Removed now. Thanks.

> > +
> > +:Author: Kishon Vijay Abraham I <kishon@...com>
> >  
> >  This document is a guide to use the PCI Endpoint Framework in order to create
> >  endpoint controller driver, endpoint function driver, and using configfs
> >  interface to bind the function driver to the controller driver.
> >  
> > -1. Introduction
> > +Introduction
> > +============
> >  
> >  Linux has a comprehensive PCI subsystem to support PCI controllers that
> >  operates in Root Complex mode. The subsystem has capability to scan PCI bus,
> > @@ -19,26 +25,30 @@ add endpoint mode support in Linux. This will help to run Linux in an
> >  EP system which can have a wide variety of use cases from testing or
> >  validation, co-processor accelerator, etc.
> >  
> > -2. PCI Endpoint Core
> > +PCI Endpoint Core
> > +=================
> >  
> >  The PCI Endpoint Core layer comprises 3 components: the Endpoint Controller
> >  library, the Endpoint Function library, and the configfs layer to bind the
> >  endpoint function with the endpoint controller.
> >  
> > -2.1 PCI Endpoint Controller(EPC) Library
> > +PCI Endpoint Controller(EPC) Library
> > +------------------------------------
> >  
> >  The EPC library provides APIs to be used by the controller that can operate
> >  in endpoint mode. It also provides APIs to be used by function driver/library
> >  in order to implement a particular endpoint function.
> >  
> > -2.1.1 APIs for the PCI controller Driver
> > +APIs for the PCI controller Driver
> > +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >  
> >  This section lists the APIs that the PCI Endpoint core provides to be used
> >  by the PCI controller driver.
> >  
> > -*) devm_pci_epc_create()/pci_epc_create()
> > +* devm_pci_epc_create()/pci_epc_create()
> >  
> >     The PCI controller driver should implement the following ops:
> > +
> >  	 * write_header: ops to populate configuration space header
> >  	 * set_bar: ops to configure the BAR
> >  	 * clear_bar: ops to reset the BAR
> > @@ -51,110 +61,116 @@ by the PCI controller driver.
> >     The PCI controller driver can then create a new EPC device by invoking
> >     devm_pci_epc_create()/pci_epc_create().
> >  
> > -*) devm_pci_epc_destroy()/pci_epc_destroy()
> > +* devm_pci_epc_destroy()/pci_epc_destroy()
> >  
> >     The PCI controller driver can destroy the EPC device created by either
> >     devm_pci_epc_create() or pci_epc_create() using devm_pci_epc_destroy() or
> >     pci_epc_destroy().
> >  
> > -*) pci_epc_linkup()
> > +* pci_epc_linkup()
> >  
> >     In order to notify all the function devices that the EPC device to which
> >     they are linked has established a link with the host, the PCI controller
> >     driver should invoke pci_epc_linkup().
> >  
> > -*) pci_epc_mem_init()
> > +* pci_epc_mem_init()
> >  
> >     Initialize the pci_epc_mem structure used for allocating EPC addr space.
> >  
> > -*) pci_epc_mem_exit()
> > +* pci_epc_mem_exit()
> >  
> >     Cleanup the pci_epc_mem structure allocated during pci_epc_mem_init().
> >  
> > -2.1.2 APIs for the PCI Endpoint Function Driver
> > +
> > +APIs for the PCI Endpoint Function Driver
> > +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >  
> >  This section lists the APIs that the PCI Endpoint core provides to be used
> >  by the PCI endpoint function driver.
> >  
> > -*) pci_epc_write_header()
> > +* pci_epc_write_header()
> >  
> >     The PCI endpoint function driver should use pci_epc_write_header() to
> >     write the standard configuration header to the endpoint controller.
> >  
> > -*) pci_epc_set_bar()
> > +* pci_epc_set_bar()
> >  
> >     The PCI endpoint function driver should use pci_epc_set_bar() to configure
> >     the Base Address Register in order for the host to assign PCI addr space.
> >     Register space of the function driver is usually configured
> >     using this API.
> >  
> > -*) pci_epc_clear_bar()
> > +* pci_epc_clear_bar()
> >  
> >     The PCI endpoint function driver should use pci_epc_clear_bar() to reset
> >     the BAR.
> >  
> > -*) pci_epc_raise_irq()
> > +* pci_epc_raise_irq()
> >  
> >     The PCI endpoint function driver should use pci_epc_raise_irq() to raise
> >     Legacy Interrupt, MSI or MSI-X Interrupt.
> >  
> > -*) pci_epc_mem_alloc_addr()
> > +* pci_epc_mem_alloc_addr()
> >  
> >     The PCI endpoint function driver should use pci_epc_mem_alloc_addr(), to
> >     allocate memory address from EPC addr space which is required to access
> >     RC's buffer
> >  
> > -*) pci_epc_mem_free_addr()
> > +* pci_epc_mem_free_addr()
> >  
> >     The PCI endpoint function driver should use pci_epc_mem_free_addr() to
> >     free the memory space allocated using pci_epc_mem_alloc_addr().
> >  
> > -2.1.3 Other APIs
> > +Other APIs
> > +~~~~~~~~~~
> >  
> >  There are other APIs provided by the EPC library. These are used for binding
> >  the EPF device with EPC device. pci-ep-cfs.c can be used as reference for
> >  using these APIs.
> >  
> > -*) pci_epc_get()
> > +* pci_epc_get()
> >  
> >     Get a reference to the PCI endpoint controller based on the device name of
> >     the controller.
> >  
> > -*) pci_epc_put()
> > +* pci_epc_put()
> >  
> >     Release the reference to the PCI endpoint controller obtained using
> >     pci_epc_get()
> >  
> > -*) pci_epc_add_epf()
> > +* pci_epc_add_epf()
> >  
> >     Add a PCI endpoint function to a PCI endpoint controller. A PCIe device
> >     can have up to 8 functions according to the specification.
> >  
> > -*) pci_epc_remove_epf()
> > +* pci_epc_remove_epf()
> >  
> >     Remove the PCI endpoint function from PCI endpoint controller.
> >  
> > -*) pci_epc_start()
> > +* pci_epc_start()
> >  
> >     The PCI endpoint function driver should invoke pci_epc_start() once it
> >     has configured the endpoint function and wants to start the PCI link.
> >  
> > -*) pci_epc_stop()
> > +* pci_epc_stop()
> >  
> >     The PCI endpoint function driver should invoke pci_epc_stop() to stop
> >     the PCI LINK.
> >  
> > -2.2 PCI Endpoint Function(EPF) Library
> > +
> > +PCI Endpoint Function(EPF) Library
> > +----------------------------------
> >  
> >  The EPF library provides APIs to be used by the function driver and the EPC
> >  library to provide endpoint mode functionality.
> >  
> > -2.2.1 APIs for the PCI Endpoint Function Driver
> > +APIs for the PCI Endpoint Function Driver
> > +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >  
> >  This section lists the APIs that the PCI Endpoint core provides to be used
> >  by the PCI endpoint function driver.
> >  
> > -*) pci_epf_register_driver()
> > +* pci_epf_register_driver()
> >  
> >     The PCI Endpoint Function driver should implement the following ops:
> >  	 * bind: ops to perform when a EPC device has been bound to EPF device
> > @@ -166,50 +182,54 @@ by the PCI endpoint function driver.
> >    The PCI Function driver can then register the PCI EPF driver by using
> >    pci_epf_register_driver().
> >  
> > -*) pci_epf_unregister_driver()
> > +* pci_epf_unregister_driver()
> >  
> >    The PCI Function driver can unregister the PCI EPF driver by using
> >    pci_epf_unregister_driver().
> >  
> > -*) pci_epf_alloc_space()
> > +* pci_epf_alloc_space()
> >  
> >    The PCI Function driver can allocate space for a particular BAR using
> >    pci_epf_alloc_space().
> >  
> > -*) pci_epf_free_space()
> > +* pci_epf_free_space()
> >  
> >    The PCI Function driver can free the allocated space
> >    (using pci_epf_alloc_space) by invoking pci_epf_free_space().
> >  
> > -2.2.2 APIs for the PCI Endpoint Controller Library
> > +APIs for the PCI Endpoint Controller Library
> > +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > +
> >  This section lists the APIs that the PCI Endpoint core provides to be used
> >  by the PCI endpoint controller library.
> >  
> > -*) pci_epf_linkup()
> > +* pci_epf_linkup()
> >  
> >     The PCI endpoint controller library invokes pci_epf_linkup() when the
> >     EPC device has established the connection to the host.
> >  
> > -2.2.2 Other APIs
> > +Other APIs
> > +~~~~~~~~~~
> > +
> >  There are other APIs provided by the EPF library. These are used to notify
> >  the function driver when the EPF device is bound to the EPC device.
> >  pci-ep-cfs.c can be used as reference for using these APIs.
> >  
> > -*) pci_epf_create()
> > +* pci_epf_create()
> >  
> >     Create a new PCI EPF device by passing the name of the PCI EPF device.
> >     This name will be used to bind the the EPF device to a EPF driver.
> >  
> > -*) pci_epf_destroy()
> > +* pci_epf_destroy()
> >  
> >     Destroy the created PCI EPF device.
> >  
> > -*) pci_epf_bind()
> > +* pci_epf_bind()
> >  
> >     pci_epf_bind() should be invoked when the EPF device has been bound to
> >     a EPC device.
> >  
> > -*) pci_epf_unbind()
> > +* pci_epf_unbind()
> >  
> >     pci_epf_unbind() should be invoked when the binding between EPC device
> >     and EPF device is lost.
> > diff --git a/Documentation/PCI/index.rst b/Documentation/PCI/index.rst
> > index f54b65b1ca5f..f4c6121868c3 100644
> > --- a/Documentation/PCI/index.rst
> > +++ b/Documentation/PCI/index.rst
> > @@ -15,3 +15,4 @@ Linux PCI Bus Subsystem
> >     acpi-info
> >     pci-error-recovery
> >     pcieaer-howto
> > +   endpoint/index
> 
> 
> 
> Thanks,
> Mauro

-- 
Cheers,
Changbin Du

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