linux/drivers/xen/xen-pciback
Oleksandr Andrushchenko a67efff288 xen-pciback: allow compiling on other archs than x86
Xen-pciback driver was designed to be built for x86 only. But it
can also be used by other architectures, e.g. Arm.

Currently PCI backend implements multiple functionalities at a time,
such as:
1. It is used as a database for assignable PCI devices, e.g. xl
   pci-assignable-{add|remove|list} manipulates that list. So, whenever
   the toolstack needs to know which PCI devices can be passed through
   it reads that from the relevant sysfs entries of the pciback.
2. It is used to hold the unbound PCI devices list, e.g. when passing
   through a PCI device it needs to be unbound from the relevant device
   driver and bound to pciback (strictly speaking it is not required
   that the device is bound to pciback, but pciback is again used as a
   database of the passed through PCI devices, so we can re-bind the
   devices back to their original drivers when guest domain shuts down)
3. Device reset for the devices being passed through
4. Para-virtualised use-cases support

The para-virtualised part of the driver is not always needed as some
architectures, e.g. Arm or x86 PVH Dom0, are not using backend-frontend
model for PCI device passthrough.

For such use-cases make the very first step in splitting the
xen-pciback driver into two parts: Xen PCI stub and PCI PV backend
drivers.

For that add new configuration options CONFIG_XEN_PCI_STUB and
CONFIG_XEN_PCIDEV_STUB, so the driver can be limited in its
functionality, e.g. no support for para-virtualised scenario.
x86 platform will continue using CONFIG_XEN_PCIDEV_BACKEND for the
fully featured backend driver.

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Signed-off-by: Anastasiia Lukianenko <anastasiia_lukianenko@epam.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20211028143620.144936-1-andr2000@gmail.com
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
2021-11-02 08:03:43 -05:00
..
conf_space_capability.c xen-pciback: Fix return in pm_ctrl_init() 2021-11-02 07:45:44 -05:00
conf_space_header.c xen-pciback: allow compiling on other archs than x86 2021-11-02 08:03:43 -05:00
conf_space_quirks.c xen-pciback: Use dev_printk() when possible 2020-05-27 17:27:37 -05:00
conf_space_quirks.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
conf_space.c xen/pci: Get rid of verbose_request and use dev_dbg() instead 2020-05-29 10:44:59 -05:00
conf_space.h xen-pciback: fix INTERRUPT_TYPE_* defines 2020-03-30 17:31:57 +02:00
Makefile xen-pciback: allow compiling on other archs than x86 2021-11-02 08:03:43 -05:00
passthrough.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pci_stub.c xen-pciback: allow compiling on other archs than x86 2021-11-02 08:03:43 -05:00
pciback_ops.c xen/pciback: use lateeoi irq binding 2020-10-20 10:22:08 +02:00
pciback.h xen-pciback: allow compiling on other archs than x86 2021-11-02 08:03:43 -05:00
vpci.c xen-pciback: redo VF placement in the virtual topology 2021-05-21 09:55:13 +02:00
xenbus.c xen-pciback: allow compiling on other archs than x86 2021-11-02 08:03:43 -05:00