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When a switch endpoint is configured without NTB, the mmio_ntb registers
will read all zeros. However, in corner case configurations where the
partition ID is not zero and NTB is not enabled, the code will have the
wrong partition ID and this causes the driver to use the wrong set of
drivers. To fix this we simply take the partition ID from the system info
region.
Reported-by: Dingbao Chen <[email protected]>
Signed-off-by: Logan Gunthorpe <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
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Convert from "cdev_add() + device_add()" to cdev_device_add(), and from
"device_del() + cdev_del()" to cdev_device_del().
[bhelgaas: changelog]
Signed-off-by: Logan Gunthorpe <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
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Add a couple of special IOCTLs to:
* Inform userspace of firmware partition locations
* Pass event counts and allow userspace to wait on events
* Translate PFF numbers used by the switch to port numbers
[Dan Carpenter <[email protected]>: fix off-by-one in
ioctl_event_ctl()]
Tested-by: Krishna Dhulipala <[email protected]>
Signed-off-by: Logan Gunthorpe <[email protected]>
Signed-off-by: Stephen Bates <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Wei Zhang <[email protected]>
Reviewed-by: Jens Axboe <[email protected]>
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Add a few read-only sysfs attributes which provide some device information
that is exposed from the devices, primarily component and device names and
versions.
These are documented in Documentation/ABI/testing/sysfs-class-switchtec.
Tested-by: Krishna Dhulipala <[email protected]>
Signed-off-by: Logan Gunthorpe <[email protected]>
Signed-off-by: Stephen Bates <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Wei Zhang <[email protected]>
Reviewed-by: Jens Axboe <[email protected]>
Reviewed-by: Greg Kroah-Hartman <[email protected]>
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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 <[email protected]>: don't invert error codes]
[Christophe JAILLET <[email protected]>: fix
switchtec_dev_open() error handling]
Tested-by: Krishna Dhulipala <[email protected]>
Signed-off-by: Logan Gunthorpe <[email protected]>
Signed-off-by: Stephen Bates <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Wei Zhang <[email protected]>
Reviewed-by: Jens Axboe <[email protected]>
Reviewed-by: Greg Kroah-Hartman <[email protected]>
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