mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 23:55:36 +07:00
1c51b50c29
The PCI MSI sysfs code is a mess with kobjects for things that don't really
need to be kobjects. This patch creates attributes dynamically for the MSI
interrupts instead of using kobjects.
Note, this removes a directory from sysfs. Old MSI kobjects:
pci_device
└── msi_irqs
└── 40
└── mode
New MSI attributes:
pci_device
└── msi_irqs
└── 40
As there was only one file "mode" with the kobject model, the interrupt
number is now a file that returns the "mode" of the interrupt (msi vs.
msix).
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
253 lines
10 KiB
Plaintext
253 lines
10 KiB
Plaintext
What: /sys/bus/pci/drivers/.../bind
|
|
Date: December 2003
|
|
Contact: linux-pci@vger.kernel.org
|
|
Description:
|
|
Writing a device location to this file will cause
|
|
the driver to attempt to bind to the device found at
|
|
this location. This is useful for overriding default
|
|
bindings. The format for the location is: DDDD:BB:DD.F.
|
|
That is Domain:Bus:Device.Function and is the same as
|
|
found in /sys/bus/pci/devices/. For example:
|
|
# echo 0000:00:19.0 > /sys/bus/pci/drivers/foo/bind
|
|
(Note: kernels before 2.6.28 may require echo -n).
|
|
|
|
What: /sys/bus/pci/drivers/.../unbind
|
|
Date: December 2003
|
|
Contact: linux-pci@vger.kernel.org
|
|
Description:
|
|
Writing a device location to this file will cause the
|
|
driver to attempt to unbind from the device found at
|
|
this location. This may be useful when overriding default
|
|
bindings. The format for the location is: DDDD:BB:DD.F.
|
|
That is Domain:Bus:Device.Function and is the same as
|
|
found in /sys/bus/pci/devices/. For example:
|
|
# echo 0000:00:19.0 > /sys/bus/pci/drivers/foo/unbind
|
|
(Note: kernels before 2.6.28 may require echo -n).
|
|
|
|
What: /sys/bus/pci/drivers/.../new_id
|
|
Date: December 2003
|
|
Contact: linux-pci@vger.kernel.org
|
|
Description:
|
|
Writing a device ID to this file will attempt to
|
|
dynamically add a new device ID to a PCI device driver.
|
|
This may allow the driver to support more hardware than
|
|
was included in the driver's static device ID support
|
|
table at compile time. The format for the device ID is:
|
|
VVVV DDDD SVVV SDDD CCCC MMMM PPPP. That is Vendor ID,
|
|
Device ID, Subsystem Vendor ID, Subsystem Device ID,
|
|
Class, Class Mask, and Private Driver Data. The Vendor ID
|
|
and Device ID fields are required, the rest are optional.
|
|
Upon successfully adding an ID, the driver will probe
|
|
for the device and attempt to bind to it. For example:
|
|
# echo "8086 10f5" > /sys/bus/pci/drivers/foo/new_id
|
|
|
|
What: /sys/bus/pci/drivers/.../remove_id
|
|
Date: February 2009
|
|
Contact: Chris Wright <chrisw@sous-sol.org>
|
|
Description:
|
|
Writing a device ID to this file will remove an ID
|
|
that was dynamically added via the new_id sysfs entry.
|
|
The format for the device ID is:
|
|
VVVV DDDD SVVV SDDD CCCC MMMM. That is Vendor ID, Device
|
|
ID, Subsystem Vendor ID, Subsystem Device ID, Class,
|
|
and Class Mask. The Vendor ID and Device ID fields are
|
|
required, the rest are optional. After successfully
|
|
removing an ID, the driver will no longer support the
|
|
device. This is useful to ensure auto probing won't
|
|
match the driver to the device. For example:
|
|
# echo "8086 10f5" > /sys/bus/pci/drivers/foo/remove_id
|
|
|
|
What: /sys/bus/pci/rescan
|
|
Date: January 2009
|
|
Contact: Linux PCI developers <linux-pci@vger.kernel.org>
|
|
Description:
|
|
Writing a non-zero value to this attribute will
|
|
force a rescan of all PCI buses in the system, and
|
|
re-discover previously removed devices.
|
|
|
|
What: /sys/bus/pci/devices/.../msi_irqs/
|
|
Date: September, 2011
|
|
Contact: Neil Horman <nhorman@tuxdriver.com>
|
|
Description:
|
|
The /sys/devices/.../msi_irqs directory contains a variable set
|
|
of files, with each file being named after a corresponding msi
|
|
irq vector allocated to that device.
|
|
|
|
What: /sys/bus/pci/devices/.../msi_irqs/<N>
|
|
Date: September 2011
|
|
Contact: Neil Horman <nhorman@tuxdriver.com>
|
|
Description:
|
|
This attribute indicates the mode that the irq vector named by
|
|
the file is in (msi vs. msix)
|
|
|
|
What: /sys/bus/pci/devices/.../remove
|
|
Date: January 2009
|
|
Contact: Linux PCI developers <linux-pci@vger.kernel.org>
|
|
Description:
|
|
Writing a non-zero value to this attribute will
|
|
hot-remove the PCI device and any of its children.
|
|
|
|
What: /sys/bus/pci/devices/.../pci_bus/.../rescan
|
|
Date: May 2011
|
|
Contact: Linux PCI developers <linux-pci@vger.kernel.org>
|
|
Description:
|
|
Writing a non-zero value to this attribute will
|
|
force a rescan of the bus and all child buses,
|
|
and re-discover devices removed earlier from this
|
|
part of the device tree.
|
|
|
|
What: /sys/bus/pci/devices/.../rescan
|
|
Date: January 2009
|
|
Contact: Linux PCI developers <linux-pci@vger.kernel.org>
|
|
Description:
|
|
Writing a non-zero value to this attribute will
|
|
force a rescan of the device's parent bus and all
|
|
child buses, and re-discover devices removed earlier
|
|
from this part of the device tree.
|
|
|
|
What: /sys/bus/pci/devices/.../reset
|
|
Date: July 2009
|
|
Contact: Michael S. Tsirkin <mst@redhat.com>
|
|
Description:
|
|
Some devices allow an individual function to be reset
|
|
without affecting other functions in the same device.
|
|
For devices that have this support, a file named reset
|
|
will be present in sysfs. Writing 1 to this file
|
|
will perform reset.
|
|
|
|
What: /sys/bus/pci/devices/.../vpd
|
|
Date: February 2008
|
|
Contact: Ben Hutchings <bhutchings@solarflare.com>
|
|
Description:
|
|
A file named vpd in a device directory will be a
|
|
binary file containing the Vital Product Data for the
|
|
device. It should follow the VPD format defined in
|
|
PCI Specification 2.1 or 2.2, but users should consider
|
|
that some devices may have malformatted data. If the
|
|
underlying VPD has a writable section then the
|
|
corresponding section of this file will be writable.
|
|
|
|
What: /sys/bus/pci/devices/.../virtfnN
|
|
Date: March 2009
|
|
Contact: Yu Zhao <yu.zhao@intel.com>
|
|
Description:
|
|
This symbolic link appears when hardware supports the SR-IOV
|
|
capability and the Physical Function driver has enabled it.
|
|
The symbolic link points to the PCI device sysfs entry of the
|
|
Virtual Function whose index is N (0...MaxVFs-1).
|
|
|
|
What: /sys/bus/pci/devices/.../dep_link
|
|
Date: March 2009
|
|
Contact: Yu Zhao <yu.zhao@intel.com>
|
|
Description:
|
|
This symbolic link appears when hardware supports the SR-IOV
|
|
capability and the Physical Function driver has enabled it,
|
|
and this device has vendor specific dependencies with others.
|
|
The symbolic link points to the PCI device sysfs entry of
|
|
Physical Function this device depends on.
|
|
|
|
What: /sys/bus/pci/devices/.../physfn
|
|
Date: March 2009
|
|
Contact: Yu Zhao <yu.zhao@intel.com>
|
|
Description:
|
|
This symbolic link appears when a device is a Virtual Function.
|
|
The symbolic link points to the PCI device sysfs entry of the
|
|
Physical Function this device associates with.
|
|
|
|
What: /sys/bus/pci/slots/.../module
|
|
Date: June 2009
|
|
Contact: linux-pci@vger.kernel.org
|
|
Description:
|
|
This symbolic link points to the PCI hotplug controller driver
|
|
module that manages the hotplug slot.
|
|
|
|
What: /sys/bus/pci/devices/.../label
|
|
Date: July 2010
|
|
Contact: Narendra K <narendra_k@dell.com>, linux-bugs@dell.com
|
|
Description:
|
|
Reading this attribute will provide the firmware
|
|
given name (SMBIOS type 41 string or ACPI _DSM string) of
|
|
the PCI device. The attribute will be created only
|
|
if the firmware has given a name to the PCI device.
|
|
ACPI _DSM string name will be given priority if the
|
|
system firmware provides SMBIOS type 41 string also.
|
|
Users:
|
|
Userspace applications interested in knowing the
|
|
firmware assigned name of the PCI device.
|
|
|
|
What: /sys/bus/pci/devices/.../index
|
|
Date: July 2010
|
|
Contact: Narendra K <narendra_k@dell.com>, linux-bugs@dell.com
|
|
Description:
|
|
Reading this attribute will provide the firmware
|
|
given instance (SMBIOS type 41 device type instance) of the
|
|
PCI device. The attribute will be created only if the firmware
|
|
has given an instance number to the PCI device.
|
|
Users:
|
|
Userspace applications interested in knowing the
|
|
firmware assigned device type instance of the PCI
|
|
device that can help in understanding the firmware
|
|
intended order of the PCI device.
|
|
|
|
What: /sys/bus/pci/devices/.../acpi_index
|
|
Date: July 2010
|
|
Contact: Narendra K <narendra_k@dell.com>, linux-bugs@dell.com
|
|
Description:
|
|
Reading this attribute will provide the firmware
|
|
given instance (ACPI _DSM instance number) of the PCI device.
|
|
The attribute will be created only if the firmware has given
|
|
an instance number to the PCI device. ACPI _DSM instance number
|
|
will be given priority if the system firmware provides SMBIOS
|
|
type 41 device type instance also.
|
|
Users:
|
|
Userspace applications interested in knowing the
|
|
firmware assigned instance number of the PCI
|
|
device that can help in understanding the firmware
|
|
intended order of the PCI device.
|
|
|
|
What: /sys/bus/pci/devices/.../d3cold_allowed
|
|
Date: July 2012
|
|
Contact: Huang Ying <ying.huang@intel.com>
|
|
Description:
|
|
d3cold_allowed is bit to control whether the corresponding PCI
|
|
device can be put into D3Cold state. If it is cleared, the
|
|
device will never be put into D3Cold state. If it is set, the
|
|
device may be put into D3Cold state if other requirements are
|
|
satisfied too. Reading this attribute will show the current
|
|
value of d3cold_allowed bit. Writing this attribute will set
|
|
the value of d3cold_allowed bit.
|
|
|
|
What: /sys/bus/pci/devices/.../sriov_totalvfs
|
|
Date: November 2012
|
|
Contact: Donald Dutile <ddutile@redhat.com>
|
|
Description:
|
|
This file appears when a physical PCIe device supports SR-IOV.
|
|
Userspace applications can read this file to determine the
|
|
maximum number of Virtual Functions (VFs) a PCIe physical
|
|
function (PF) can support. Typically, this is the value reported
|
|
in the PF's SR-IOV extended capability structure's TotalVFs
|
|
element. Drivers have the ability at probe time to reduce the
|
|
value read from this file via the pci_sriov_set_totalvfs()
|
|
function.
|
|
|
|
What: /sys/bus/pci/devices/.../sriov_numvfs
|
|
Date: November 2012
|
|
Contact: Donald Dutile <ddutile@redhat.com>
|
|
Description:
|
|
This file appears when a physical PCIe device supports SR-IOV.
|
|
Userspace applications can read and write to this file to
|
|
determine and control the enablement or disablement of Virtual
|
|
Functions (VFs) on the physical function (PF). A read of this
|
|
file will return the number of VFs that are enabled on this PF.
|
|
A number written to this file will enable the specified
|
|
number of VFs. A userspace application would typically read the
|
|
file and check that the value is zero, and then write the number
|
|
of VFs that should be enabled on the PF; the value written
|
|
should be less than or equal to the value in the sriov_totalvfs
|
|
file. A userspace application wanting to disable the VFs would
|
|
write a zero to this file. The core ensures that valid values
|
|
are written to this file, and returns errors when values are not
|
|
valid. For example, writing a 2 to this file when sriov_numvfs
|
|
is not 0 and not 2 already will return an error. Writing a 10
|
|
when the value of sriov_totalvfs is 8 will return an error.
|