linux/drivers
Konrad Rzeszutek Wilk 30edc14bf3 xen/pciback: xen pci backend driver.
This is the host side counterpart to the frontend driver in
drivers/pci/xen-pcifront.c. The PV protocol is also implemented by
frontend drivers in other OSes too, such as the BSDs.

The PV protocol is rather simple. There is page shared with the guest,
which has the 'struct xen_pci_sharedinfo' embossed in it. The backend
has a thread that is kicked every-time the structure is changed and
based on the operation field it performs specific tasks:

 XEN_PCI_OP_conf_[read|write]:
   Read/Write 0xCF8/0xCFC filtered data. (conf_space*.c)
   Based on which field is probed, we either enable/disable the PCI
   device, change power state, read VPD, etc. The major goal of this
   call is to provide a Physical IRQ (PIRQ) to the guest.

   The PIRQ is Xen hypervisor global IRQ value irrespective of the IRQ
   is tied in to the IO-APIC, or is a vector. For GSI type
   interrupts, the PIRQ==GSI holds. For MSI/MSI-X the
   PIRQ value != Linux IRQ number (thought PIRQ==vector).

   Please note, that with Xen, all interrupts (except those level shared ones)
   are injected directly to the guest - there is no host interaction.

 XEN_PCI_OP_[enable|disable]_msi[|x] (pciback_ops.c)
   Enables/disables the MSI/MSI-X capability of the device. These operations
   setup the MSI/MSI-X vectors for the guest and pass them to the frontend.

   When the device is activated, the interrupts are directly injected in the
   guest without involving the host.

 XEN_PCI_OP_aer_[detected|resume|mmio|slotreset]: In case of failure,
  perform the appropriate AER commands on the guest. Right now that is
  a cop-out - we just kill the guest.

Besides implementing those commands, it can also

 - hide a PCI device from the host. When booting up, the user can specify
   xen-pciback.hide=(1:0:0)(BDF..) so that host does not try to use the
   device.

The driver was lifted from linux-2.6.18.hg tree and fixed up
so that it could compile under v3.0. Per suggestion from Jesse Barnes
moved the driver to drivers/xen/xen-pciback.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2011-07-19 20:58:01 -04:00
..
accessibility
acpi Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2011-05-29 11:19:16 -07:00
amba
ata libata: fix unexpectedly frozen port after ata_eh_reset() 2011-06-07 15:55:55 -04:00
atm
auxdisplay
base PM / Runtime: Fix loops in pm_runtime_clk_notify() 2011-06-07 23:34:58 +02:00
bcma
block Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2011-06-04 08:11:26 +09:00
bluetooth Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-2.6 into for-davem 2011-06-17 12:40:36 -04:00
cdrom block: fix mismerge of the DISK_EVENT_MEDIA_CHANGE removal 2011-06-02 05:29:19 +09:00
char drivers/char/hpet.c: fix periodic-emulation for delayed interrupts 2011-06-15 20:04:02 -07:00
clk
clocksource Revert "clocksource: sh_cmt: Runtime PM support" 2011-05-31 15:26:42 +09:00
connector
cpufreq [CPUFREQ] powernow-k8: Don't try to transition if the pstate is incorrect 2011-06-16 16:31:13 -04:00
cpuidle Merge branch 'idle-release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6 2011-05-29 11:18:09 -07:00
crypto
dca
dio
dma dmaengine: shdma: SH_DMAC_MAX_CHANNELS message fix 2011-06-14 15:03:07 +09:00
edac
eisa
firewire
firmware iscsi_ibft: iscsi_ibft_find unused variable i 2011-06-09 09:05:12 -04:00
gpio gpio/omap4: Fix missing interrupts during device wakeup due to IOPAD. 2011-06-16 08:40:43 -06:00
gpu drm/radeon/kms/r6xx+: voltage fixes 2011-06-21 09:38:25 +10:00
hid Revert "HID: magicmouse: ignore 'ivalid report id' while switching modes" 2011-06-16 12:21:34 +02:00
hwmon hwmon: (s3c) Initialize sysfs attributes 2011-06-17 23:22:27 -07:00
hwspinlock
i2c
ide ide-cd: signedness warning fix again 2011-06-11 15:06:48 -07:00
idle
ieee802154
infiniband
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2011-06-20 08:59:46 -07:00
isdn gigaset: call module_put before restart of if_open() 2011-06-17 15:27:32 -04:00
leds leds: fix the incorrect display in menuconfig 2011-06-15 20:04:01 -07:00
lguest
macintosh
mca
md md/raid5: remove unusual use of bio_iovec_idx() 2011-06-14 14:23:57 +10:00
media Merge branch 'staging-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6 2011-06-09 13:09:07 -07:00
memstick
message
mfd
misc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2011-06-20 20:10:18 -07:00
mmc Merge branch 'fixes' of master.kernel.org:/home/rmk/linux-2.6-arm 2011-06-15 22:01:36 -07:00
mtd
net pxa168_eth: fix race in transmit path. 2011-06-20 14:02:07 -07:00
nfc
nubus
of
oprofile oprofile: Fix locking dependency in sync_start() 2011-05-31 16:33:34 +02:00
parisc
parport
pci Merge branch 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 2011-06-14 11:25:32 -07:00
pcmcia gpio: include linux/gpio.h where needed 2011-06-16 08:40:44 -06:00
platform Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mjg59/platform-drivers-x86 2011-05-29 11:44:33 -07:00
pnp
power
pps
ps3
ptp ptp: Fix some locking bugs in ptp_read() 2011-06-01 19:29:10 -07:00
rapidio
regulator
rtc Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2011-06-13 10:47:04 -07:00
s390 [S390] qdio: Split SBAL entry flags 2011-06-06 14:14:56 +02:00
sbus
scsi [SCSI] Fix oops caused by queue refcounting failure 2011-06-02 18:34:43 +09:00
sfi
sh drivers: sh: resume enabled clocks fix 2011-06-14 15:15:25 +09:00
sn
spi spi/bfin_spi: fix handling of default bits per word setting 2011-06-17 08:27:27 -06:00
ssb ssb: fix PCI(e) driver regression causing oops on PCI cards 2011-06-03 14:19:49 -04:00
staging staging: fix iio builds when IIO_RING_BUFFER is not enabled 2011-06-16 08:29:00 -07:00
target
tc
telephony
thermal
tty drivers/tty/serial/pch_uart.c: don't oops if dmi_get_system_info returns NULL 2011-06-15 20:04:02 -07:00
uio
usb USB: serial: add another 4N-GALAXY.DE PID to ftdi_sio driver 2011-06-08 13:48:30 -07:00
uwb
vhost vhost: support event index 2011-05-30 11:14:15 +09:30
video Merge branch 'fbdev-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/lethal/fbdev-3.x 2011-06-16 09:45:47 -07:00
virtio virtio: add api for delayed callbacks 2011-05-30 11:14:16 +09:30
vlynq
w1 w1: W1_MASTER_DS1WM should depend on GENERIC_HARDIRQS 2011-06-15 20:04:00 -07:00
watchdog
xen xen/pciback: xen pci backend driver. 2011-07-19 20:58:01 -04:00
zorro
Kconfig
Makefile