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Date: Wed, 14 Sep 2016 10:36:44 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: Bjorn Helgaas <bhelgaas@...gle.com>, Arnd Bergmann <arnd@...db.de>,
Jingoo Han <jingoohan1@...il.com>, <hch@...radead.org>,
<Joao.Pinto@...opsys.com>, <mingkai.hu@....com>,
<m-karicheri2@...com>, Pratyush Anand <pratyush.anand@...il.com>
CC: <linux-pci@...r.kernel.org>, <linux-doc@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-omap@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
Joao Pinto <jpinto@...opsys.com>,
Rob Herring <robh+dt@...nel.org>, <nsekhar@...com>
Subject: Re: [RFC PATCH] pci: support for configurable PCI endpoint
Hi,
Will resend the series with patch numbering.
Thanks
Kishon
On Tuesday 13 September 2016 10:40 PM, Kishon Vijay Abraham I wrote:
> This patch series
> *) adds PCI endpoint core layer
> *) modifies designware/dra7xx driver to be configured in EP mode
> *) adds a PCI endpoint *test* function driver
>
> Known Limitation:
> *) Does not support multi-function devices
>
> TODO:
> *) access buffers in RC
> *) MSI interrupts
> *) Enable user space control for the RC side PCI driver
> *) Adapt all other users of designware to use the new design
>
> HOW TO:
>
> ON THE EP SIDE:
> ***************
>
> /* EP function is configured using configfs */
> # mount -t configfs none /sys/kernel/config
>
> /* PCI EP core layer creates "pci_ep" entry in configfs */
> # cd /sys/kernel/config/pci_ep/
>
> /*
> * This is the 1st step in creating an endpoint function. This
> * creates the endpoint function device *instance*. The string
> * before the .<num> suffix will identify the driver this
> * EP function will bind to.
> * Just pci_epf_test is also valid. The .<num> suffix is used
> * if there are multiple PCI controllers and all of them wants
> * to use the same function.
> */
> # mkdir pci_epf_test.0
>
> /*
> * When the above command is given, the function device will
> * also be bound to a function driver. To find the list of
> * function drivers available in the system, use the following
> * command. To create a new driver, the following can be referred
> * drivers/pci/endpoint/functions/pci-epf-test.c
> */
> # ls /sys/bus/pci-epf/drivers
> pci_epf_test
>
> /* Now configure the endpoint function */
> # cd pci_epf_test.0
>
> /* These are the fields that can be configured */
> # ls
> baseclass_code function revid vendorid
> cache_line_size interrupt_pin subclass_code
> deviceid peripheral subsys_id
> epc progif_code subsys_vendor_id
>
> /* The function driver will populate these fields with default values */
> # cat vendorid
> 0xffff
>
> # cat interrupt_pin
> 0x0001
>
> /* The user can configure any of these fields */
> # echo 0x104c > vendorid
>
> /*
> * Next is binding this function driver to the controller driver. In
> * order to find the possible controller drivers that this function
> * driver can be bound to, the following sysfs entry can be used
> */
> # ls /sys/class/pci_epc/
> 51000000.pci
>
> /* Now bind the function driver to the controller driver */
> # echo "51000000.pcie" > epc
> [ 494.743487] dra7-pcie 51000000.pcie: no free inbound window
> [ 494.749367] pci_epf_test pci_epf_test.0: failed to set BAR4
> [ 494.755238] dra7-pcie 51000000.pcie: no free inbound window
> [ 494.761451] pci_epf_test pci_epf_test.0: failed to set BAR5
>
> /*
> * the above error messages are due to non availability of free
> * inbound windows. So the function drivers in dra7xx can use
> * only 4 (BAR0..BAR3) BARs
> */
>
> /****** PCI endpoint is configured ******/
>
> ON THE HOST SIDE:
> *****************
> # modprobe pci_endpoint_test
> [ 8.197560] ****** Testing pci-endpoint-test Device ******
> [ 9.056990] Reset: OKAY
> [ 9.059753] BAR1 OKAY
> [ 9.062419] BAR2 OKAY
> [ 9.069506] BAR3 OKAY
> [ 9.071880] BAR4 NOT OKAY
> [ 9.074618] BAR5 NOT OKAY
> [ 9.379257] Legacy IRQ: OKAY
> [ 9.382281] ****** End Test ******
>
> /*
> * Rightnow these tests gets executed as soon as the pci_endpoint_test
> * module gets inserted. These will be modified so that user/user script
> * can control this. Once the functionality for EP to access RC buffer
> * is added, more tests can be added including throughput measurement tests.
> */
>
>
> Kishon Vijay Abraham I (11):
> pci: endpoint: add EP core layer to enable EP controller and EP
> functions
> pci: endpoint: introduce configfs entry for configuring EP functions
> Documentation: PCI: guide to use PCI Endpoint Core Layer
> pci: endpoint: functions: add an EP function to test PCI
> pci: rename *host* directory to *controller*
> pci: controller: split designware into *core* and *host*
> pci: controller: designware: Add EP mode support
> pci: controller: dra7xx: Add EP mode support
> misc: add a new host side PCI endpoint test driver
> ARM: dts: DRA7: Modify pcie1 dt node for EP mode
> HACK: pci: controller: dra7xx: disable smart idle
>
> Documentation/PCI/00-INDEX | 5 +
> Documentation/PCI/pci-endpoint.txt | 199 ++++++++++
> Documentation/PCI/pci-test.txt | 79 ++++
> .../devicetree/bindings/pci/designware-pcie.txt | 26 +-
> Documentation/devicetree/bindings/pci/ti-pci.txt | 30 +-
> MAINTAINERS | 50 +--
> arch/arm/boot/dts/dra7.dtsi | 43 +--
> drivers/Makefile | 4 +
> drivers/misc/Kconfig | 7 +
> drivers/misc/Makefile | 1 +
> drivers/misc/pci_endpoint_test.c | 291 +++++++++++++++
> drivers/pci/Kconfig | 3 +-
> drivers/pci/Makefile | 3 -
> drivers/pci/{host => controller}/Kconfig | 109 +++++-
> drivers/pci/{host => controller}/Makefile | 2 +
> drivers/pci/{host => controller}/pci-aardvark.c | 0
> drivers/pci/{host => controller}/pci-dra7xx.c | 340 +++++++++++++----
> drivers/pci/{host => controller}/pci-exynos.c | 0
> drivers/pci/{host => controller}/pci-host-common.c | 0
> .../pci/{host => controller}/pci-host-generic.c | 0
> drivers/pci/{host => controller}/pci-hyperv.c | 0
> drivers/pci/{host => controller}/pci-imx6.c | 0
> drivers/pci/{host => controller}/pci-keystone-dw.c | 0
> drivers/pci/{host => controller}/pci-keystone.c | 0
> drivers/pci/{host => controller}/pci-keystone.h | 0
> drivers/pci/{host => controller}/pci-layerscape.c | 0
> drivers/pci/{host => controller}/pci-mvebu.c | 0
> drivers/pci/{host => controller}/pci-rcar-gen2.c | 0
> drivers/pci/{host => controller}/pci-tegra.c | 0
> .../pci/{host => controller}/pci-thunder-ecam.c | 0
> drivers/pci/{host => controller}/pci-thunder-pem.c | 0
> drivers/pci/{host => controller}/pci-versatile.c | 0
> drivers/pci/{host => controller}/pci-xgene-msi.c | 0
> drivers/pci/{host => controller}/pci-xgene.c | 0
> drivers/pci/{host => controller}/pcie-altera-msi.c | 0
> drivers/pci/{host => controller}/pcie-altera.c | 0
> drivers/pci/{host => controller}/pcie-armada8k.c | 0
> drivers/pci/{host => controller}/pcie-artpec6.c | 0
> drivers/pci/controller/pcie-designware-ep.c | 228 ++++++++++++
> .../pcie-designware-host.c} | 294 +++------------
> .../{host => controller}/pcie-designware-plat.c | 0
> drivers/pci/controller/pcie-designware.c | 233 ++++++++++++
> drivers/pci/controller/pcie-designware.h | 238 ++++++++++++
> drivers/pci/{host => controller}/pcie-hisi.c | 0
> drivers/pci/{host => controller}/pcie-iproc-bcma.c | 0
> drivers/pci/{host => controller}/pcie-iproc-msi.c | 0
> .../pci/{host => controller}/pcie-iproc-platform.c | 0
> drivers/pci/{host => controller}/pcie-iproc.c | 0
> drivers/pci/{host => controller}/pcie-iproc.h | 0
> drivers/pci/{host => controller}/pcie-qcom.c | 0
> drivers/pci/{host => controller}/pcie-rcar.c | 0
> drivers/pci/{host => controller}/pcie-spear13xx.c | 0
> drivers/pci/{host => controller}/pcie-xilinx-nwl.c | 0
> drivers/pci/{host => controller}/pcie-xilinx.c | 0
> drivers/pci/endpoint/Kconfig | 25 ++
> drivers/pci/endpoint/Makefile | 6 +
> drivers/pci/endpoint/functions/Kconfig | 12 +
> drivers/pci/endpoint/functions/Makefile | 5 +
> drivers/pci/endpoint/functions/pci-epf-test.c | 272 ++++++++++++++
> drivers/pci/endpoint/pci-ep-cfs.c | 275 ++++++++++++++
> drivers/pci/endpoint/pci-epc-core.c | 389 ++++++++++++++++++++
> drivers/pci/endpoint/pci-epf-core.c | 338 +++++++++++++++++
> drivers/pci/host/pcie-designware.h | 89 -----
> include/linux/mod_devicetable.h | 10 +
> include/linux/pci-epc.h | 100 +++++
> include/linux/pci-epf.h | 159 ++++++++
> 66 files changed, 3373 insertions(+), 492 deletions(-)
> create mode 100644 Documentation/PCI/pci-endpoint.txt
> create mode 100644 Documentation/PCI/pci-test.txt
> create mode 100644 drivers/misc/pci_endpoint_test.c
> rename drivers/pci/{host => controller}/Kconfig (79%)
> rename drivers/pci/{host => controller}/Makefile (93%)
> rename drivers/pci/{host => controller}/pci-aardvark.c (100%)
> rename drivers/pci/{host => controller}/pci-dra7xx.c (62%)
> rename drivers/pci/{host => controller}/pci-exynos.c (100%)
> rename drivers/pci/{host => controller}/pci-host-common.c (100%)
> rename drivers/pci/{host => controller}/pci-host-generic.c (100%)
> rename drivers/pci/{host => controller}/pci-hyperv.c (100%)
> rename drivers/pci/{host => controller}/pci-imx6.c (100%)
> rename drivers/pci/{host => controller}/pci-keystone-dw.c (100%)
> rename drivers/pci/{host => controller}/pci-keystone.c (100%)
> rename drivers/pci/{host => controller}/pci-keystone.h (100%)
> rename drivers/pci/{host => controller}/pci-layerscape.c (100%)
> rename drivers/pci/{host => controller}/pci-mvebu.c (100%)
> rename drivers/pci/{host => controller}/pci-rcar-gen2.c (100%)
> rename drivers/pci/{host => controller}/pci-tegra.c (100%)
> rename drivers/pci/{host => controller}/pci-thunder-ecam.c (100%)
> rename drivers/pci/{host => controller}/pci-thunder-pem.c (100%)
> rename drivers/pci/{host => controller}/pci-versatile.c (100%)
> rename drivers/pci/{host => controller}/pci-xgene-msi.c (100%)
> rename drivers/pci/{host => controller}/pci-xgene.c (100%)
> rename drivers/pci/{host => controller}/pcie-altera-msi.c (100%)
> rename drivers/pci/{host => controller}/pcie-altera.c (100%)
> rename drivers/pci/{host => controller}/pcie-armada8k.c (100%)
> rename drivers/pci/{host => controller}/pcie-artpec6.c (100%)
> create mode 100644 drivers/pci/controller/pcie-designware-ep.c
> rename drivers/pci/{host/pcie-designware.c => controller/pcie-designware-host.c} (64%)
> rename drivers/pci/{host => controller}/pcie-designware-plat.c (100%)
> create mode 100644 drivers/pci/controller/pcie-designware.c
> create mode 100644 drivers/pci/controller/pcie-designware.h
> rename drivers/pci/{host => controller}/pcie-hisi.c (100%)
> rename drivers/pci/{host => controller}/pcie-iproc-bcma.c (100%)
> rename drivers/pci/{host => controller}/pcie-iproc-msi.c (100%)
> rename drivers/pci/{host => controller}/pcie-iproc-platform.c (100%)
> rename drivers/pci/{host => controller}/pcie-iproc.c (100%)
> rename drivers/pci/{host => controller}/pcie-iproc.h (100%)
> rename drivers/pci/{host => controller}/pcie-qcom.c (100%)
> rename drivers/pci/{host => controller}/pcie-rcar.c (100%)
> rename drivers/pci/{host => controller}/pcie-spear13xx.c (100%)
> rename drivers/pci/{host => controller}/pcie-xilinx-nwl.c (100%)
> rename drivers/pci/{host => controller}/pcie-xilinx.c (100%)
> create mode 100644 drivers/pci/endpoint/Kconfig
> create mode 100644 drivers/pci/endpoint/Makefile
> create mode 100644 drivers/pci/endpoint/functions/Kconfig
> create mode 100644 drivers/pci/endpoint/functions/Makefile
> create mode 100644 drivers/pci/endpoint/functions/pci-epf-test.c
> create mode 100644 drivers/pci/endpoint/pci-ep-cfs.c
> create mode 100644 drivers/pci/endpoint/pci-epc-core.c
> create mode 100644 drivers/pci/endpoint/pci-epf-core.c
> delete mode 100644 drivers/pci/host/pcie-designware.h
> create mode 100644 include/linux/pci-epc.h
> create mode 100644 include/linux/pci-epf.h
>
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