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Alexander Gordeev 5fec945105 x86/MSI: Conserve interrupt resources when using multiple-MSIs 
Current multiple-MSI implementation does not take into account actual
number of requested MSIs and always rounds that number to a larger
power-of-two value.  Yet, the number of MSIs a PCI device could send (and
therefore the number of messages a device driver could request) may be
smaller.  As result, resources allocated for extra MSIs are just wasted.

This update takes advantage of 'msi_desc::nvec_used' field introduced with
generic MSI code to track the number of requested and used MSIs.  As
result, resources associated with interrupts are conserved.  Of those
resources most noticeable are x86 interrupt vectors.

The initial version of this fix also conserved IRTEs, but Jan noticed that
a malfunctioning PCI device might send a message number it did not claim
and thus refer to an IRTE it does not own.  To avoid this security hole,
as many IRTEs are reserved as the device could possibly send.

[bhelgaas: changelog, rename to "nvec_used"]
Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-06-03 14:40:44 -06:00
..
accessibility
acpi ACPICA fixes for 3.10-rc1 2013-05-09 16:33:42 -07:00
amba
ata ARM: arm-soc: late cleanups 2013-05-07 11:22:14 -07:00
atm atm: he: use mdelay instead of large udelay constants 2013-04-29 13:26:48 -04:00
auxdisplay
base Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2013-05-01 13:20:04 -07:00
bcma - Lots of cleanups from Artem, including deletion of some obsolete drivers 2013-05-09 10:15:46 -07:00
block Merge git://git.infradead.org/users/willy/linux-nvme 2013-05-09 16:35:00 -07:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2013-05-01 14:08:52 -07:00
bus
cdrom block_device_operations->release() should return void 2013-05-07 02:16:21 -04:00
char aio: don't include aio.h in sched.h 2013-05-07 20:16:25 -07:00
clk ARM: late Exynos multiplatform changes 2013-05-07 11:28:42 -07:00
clocksource ARM: late Exynos multiplatform changes 2013-05-07 11:28:42 -07:00
connector
cpufreq Merge branch 'pm-cpufreq' 2013-04-29 00:08:46 +02:00
cpuidle cpuidle: add maintainer entry 2013-04-26 22:30:25 +02:00
crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2013-05-02 14:53:12 -07:00
dca
devfreq
dio
dma Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2013-05-09 09:46:45 -07:00
edac Two small EDAC fixes. 2013-05-09 10:11:08 -07:00
eisa PCI changes for the v3.10 merge window: 2013-04-29 09:30:25 -07:00
extcon Removal of GENERIC_GPIO for v3.10 2013-05-09 09:59:16 -07:00
firewire IEEE 1394 (FireWire) subsystem changes: 2013-05-09 10:11:48 -07:00
firmware Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-05-01 17:51:54 -07:00
gpio Removal of GENERIC_GPIO for v3.10 2013-05-09 09:59:16 -07:00
gpu Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2013-05-02 19:40:34 -07:00
hid HID: debug: fix RCU preemption issue 2013-05-06 13:07:33 +02:00
hsi
hv Merge branch 'x86-paravirt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-04-30 08:41:21 -07:00
hwmon Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging 2013-05-04 13:44:38 -07:00
hwspinlock A single patch from Vincent extending OMAP's hwspinlock support to OMAP5. 2013-05-07 14:01:27 -07:00
i2c Removal of GENERIC_GPIO for v3.10 2013-05-09 09:59:16 -07:00
ide block_device_operations->release() should return void 2013-05-07 02:16:21 -04:00
idle Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux 2013-05-11 15:23:17 -07:00
iio
infiniband InfiniBand/RDMA changes for the 3.10 merge window: 2013-05-08 15:29:48 -07:00
input Removal of GENERIC_GPIO for v3.10 2013-05-09 09:59:16 -07:00
iommu x86/MSI: Conserve interrupt resources when using multiple-MSIs 2013-06-03 14:40:44 -06:00
ipack
irqchip ARM: late Exynos multiplatform changes 2013-05-07 11:28:42 -07:00
isdn Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-05-01 17:51:54 -07:00
leds Removal of GENERIC_GPIO for v3.10 2013-05-09 09:59:16 -07:00
lguest Lots of virtio work which wasn't quite ready for last merge window. Plus 2013-05-02 14:14:04 -07:00
macintosh Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2013-05-02 10:16:16 -07:00
mailbox
md dm cache: set config value 2013-05-10 14:37:21 +01:00
media Merge branch 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2013-05-02 14:38:53 -07:00
memory
memstick block_device_operations->release() should return void 2013-05-07 02:16:21 -04:00
message Merge branch 'for-3.10/core' of git://git.kernel.dk/linux-block 2013-05-08 10:13:35 -07:00
mfd For 3.10 we have a few new MFD drivers for: 2013-05-05 17:36:20 -07:00
misc Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-05-01 17:51:54 -07:00
mmc Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-05-07 15:14:53 -07:00
mtd - Lots of cleanups from Artem, including deletion of some obsolete drivers 2013-05-09 10:15:46 -07:00
net Merge branch 'stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile 2013-05-09 14:34:58 -07:00
nfc
ntb
nubus nubus: Kill nubus_proc_detach_device() 2013-05-04 14:47:26 -04:00
of net: of_mdio: fix behavior on missing phy device 2013-05-08 13:13:29 -07:00
oprofile
parisc parisc: fix partly 16/64k PAGE_SIZE boot 2013-05-06 23:08:32 +02:00
parport
pci PCI: Allocate only as many MSI vectors as requested by driver 2013-05-28 11:31:16 -06:00
pcmcia
pinctrl Removal of GENERIC_GPIO for v3.10 2013-05-09 09:59:16 -07:00
platform - Artem's removal of dead code continues (RPX, MBX860) 2013-05-10 09:09:47 -07:00
pnp Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2013-05-02 10:16:16 -07:00
power For 3.10 we have a few new MFD drivers for: 2013-05-05 17:36:20 -07:00
pps Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-05-01 17:51:54 -07:00
ps3
ptp
pwm pwm: lpc32xx: Don't change PWM_ENABLE bit in lpc32xx_pwm_config 2013-04-23 10:58:47 +02:00
rapidio
regulator Removal of GENERIC_GPIO for v3.10 2013-05-09 09:59:16 -07:00
remoteproc This pull request contains: 2013-05-07 14:04:56 -07:00
reset
rpmsg A small pull request consisting of: 2013-05-07 14:02:00 -07:00
rtc Merge branch 'stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile 2013-05-09 14:34:58 -07:00
s390 Merge branch 'for-3.10/core' of git://git.kernel.dk/linux-block 2013-05-08 10:13:35 -07:00
sbus
scsi Merge branch 'postmerge' into for-linus 2013-05-10 07:54:01 -07:00
sfi
sh
sn
spi Removal of GENERIC_GPIO for v3.10 2013-05-09 09:59:16 -07:00
ssb - Lots of cleanups from Artem, including deletion of some obsolete drivers 2013-05-09 10:15:46 -07:00
ssbi
staging Removal of GENERIC_GPIO for v3.10 2013-05-09 09:59:16 -07:00
target Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-05-01 17:51:54 -07:00
tc
thermal Merge branch 'cpu_cooling-doc-comments-update' of .git into next 2013-04-27 09:28:56 +08:00
tty Merge git://git.infradead.org/users/eparis/audit 2013-05-11 14:29:11 -07:00
uio
usb Merge branch 'stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile 2013-05-09 14:34:58 -07:00
uwb uwb: rename random32() to prandom_u32() 2013-04-29 18:28:43 -07:00
vfio vfio updates for v3.10 2013-05-02 14:02:32 -07:00
vhost vhost: more fixes for 3.10 2013-05-07 10:13:52 -07:00
video Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2013-05-10 07:48:05 -07:00
virt
virtio
vlynq
vme
w1 Removal of GENERIC_GPIO for v3.10 2013-05-09 09:59:16 -07:00
watchdog watchdog: Fix race condition in registration code 2013-05-09 08:13:41 +02:00
xen Bug-fixes: 2013-05-11 16:19:30 -07:00
zorro proc: Supply PDE attribute setting accessor functions 2013-05-01 17:29:18 -04:00
Kconfig ARM: arm-soc driver changes for 3.10 2013-05-04 12:31:18 -07:00
Makefile ARM: arm-soc driver changes for 3.10 2013-05-04 12:31:18 -07:00