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Commit 080b47de authored Mar 06, 2017 by Logan Gunthorpe Committed by Bjorn Helgaas Mar 06, 2017

MicroSemi Switchtec management interface driver

Microsemi's "Switchtec" line of PCI switch devices is already well
supported by the kernel with standard PCI switch drivers.  However, the
Switchtec device advertises a special management endpoint with a separate
PCI function address and class code.  This endpoint enables some additional
functionality which includes:

 * Packet and Byte Counters
 * Switch Firmware Upgrades
 * Event and Error logs
 * Querying port link status
 * Custom user firmware commands

Add a switchtec kernel module which provides PCI driver that exposes a char
device.  The char device provides userspace access to this interface
through read, write and (optionally) poll calls.

A userspace tool and library which utilizes this interface is available
at [1].  This tool takes inspiration (and borrows some code) from
nvme-cli [2].  The tool is largely complete at this time but additional
features may be added in the future.

[1] https://github.com/sbates130272/switchtec-user
[2] https://github.com/linux-nvme/nvme-cli



[Dan Carpenter <dan.carpenter@oracle.com>: don't invert error codes]
[Christophe JAILLET <christophe.jaillet@wanadoo.fr>: fix
switchtec_dev_open() error handling]
Tested-by: Krishna Dhulipala <krishnad@fb.com>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Stephen Bates <stephen.bates@microsemi.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Wei Zhang <wzhang@fb.com>
Reviewed-by: Jens Axboe <axboe@fb.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent c1ae3cfa

MAINTAINERS

+8 −0

Original line number	Original line	Diff line number	Diff line
	@@ -9655,6 +9655,14 @@ S: Maintained
	F: Documentation/devicetree/bindings/pci/aardvark-pci.txt		F: Documentation/devicetree/bindings/pci/aardvark-pci.txt
	F: drivers/pci/host/pci-aardvark.c		F: drivers/pci/host/pci-aardvark.c

			PCI DRIVER FOR MICROSEMI SWITCHTEC
			M: Kurt Schwemmer <kurt.schwemmer@microsemi.com>
			M: Stephen Bates <stephen.bates@microsemi.com>
			M: Logan Gunthorpe <logang@deltatee.com>
			L: linux-pci@vger.kernel.org
			S: Maintained
			F: drivers/pci/switch/switchtec*

	PCI DRIVER FOR NVIDIA TEGRA		PCI DRIVER FOR NVIDIA TEGRA
	M: Thierry Reding <thierry.reding@gmail.com>		M: Thierry Reding <thierry.reding@gmail.com>
	L: linux-tegra@vger.kernel.org		L: linux-tegra@vger.kernel.org

drivers/pci/Kconfig

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -134,3 +134,4 @@ config PCI_HYPERV
	source "drivers/pci/hotplug/Kconfig"		source "drivers/pci/hotplug/Kconfig"
	source "drivers/pci/dwc/Kconfig"		source "drivers/pci/dwc/Kconfig"
	source "drivers/pci/host/Kconfig"		source "drivers/pci/host/Kconfig"
			source "drivers/pci/switch/Kconfig"

drivers/pci/Makefile

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -68,3 +68,4 @@ ccflags-$(CONFIG_PCI_DEBUG) := -DDEBUG

	# PCI host controller drivers		# PCI host controller drivers
	obj-y += host/		obj-y += host/
			obj-y += switch/

drivers/pci/switch/Kconfig

0 → 100644

+13 −0

Original line number	Original line	Diff line number	Diff line
			menu "PCI switch controller drivers"
			depends on PCI

			config PCI_SW_SWITCHTEC
			tristate "MicroSemi Switchtec PCIe Switch Management Driver"
			help
			Enables support for the management interface for the MicroSemi
			Switchtec series of PCIe switches. Supports userspace access
			to submit MRPC commands to the switch via /dev/switchtecX
			devices. See <file:Documentation/switchtec.txt> for more
			information.

			endmenu

drivers/pci/switch/Makefile

0 → 100644

+1 −0

Original line number	Original line	Diff line number	Diff line
			obj-$(CONFIG_PCI_SW_SWITCHTEC) += switchtec.o