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MicroSemi Switchtec management interface driver

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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>
This commit is contained in:
Logan Gunthorpe 2017-03-06 18:30:54 -06:00 committed by Bjorn Helgaas
parent c1ae3cfa0e
commit 080b47def5
6 changed files with 1030 additions and 0 deletions
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8
MAINTAINERS
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@ -9655,6 +9655,14 @@ S: Maintained
F: Documentation/devicetree/bindings/pci/aardvark-pci.txt
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
M: Thierry Reding <thierry.reding@gmail.com>
L: linux-tegra@vger.kernel.org

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

1
drivers/pci/Makefile
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@ -68,3 +68,4 @@ ccflags-$(CONFIG_PCI_DEBUG) := -DDEBUG
# PCI host controller drivers
obj-y += host/
obj-y += switch/

13
drivers/pci/switch/Kconfig Normal file
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@ -0,0 +1,13 @@
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

1
drivers/pci/switch/Makefile Normal file
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@ -0,0 +1 @@
obj-$(CONFIG_PCI_SW_SWITCHTEC) += switchtec.o

1006
drivers/pci/switch/switchtec.c Normal file
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