[RFC PATCH] pci: support for configurable PCI endpoint
From: Kishon Vijay Abraham I
Date: Tue Sep 13 2016 - 13:12:22 EST
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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1.7.9.5