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Filename Latest commit message Latest commit date
Jiri Kosina c12aba5aa0 drm/i915: stop using GMBUS IRQs on Gen4 chips 
Commit 28c70f162 ("drm/i915: use the gmbus irq for waits") switched to
using GMBUS irqs instead of GPIO bit-banging for chipset generations 4
and above.

It turns out though that on many systems this leads to spurious interrupts
being generated, long after the register write to disable the IRQs has been
issued.

Typically this results in the spurious interrupt source getting
disabled:

[    9.636345] irq 16: nobody cared (try booting with the "irqpoll" option)
[    9.637915] Pid: 4157, comm: ifup Tainted: GF            3.9.0-rc2-00341-g0863702 #422
[    9.639484] Call Trace:
[    9.640731]  <IRQ>  [<ffffffff8109b40d>] __report_bad_irq+0x1d/0xc7
[    9.640731]  [<ffffffff8109b7db>] note_interrupt+0x15b/0x1e8
[    9.640731]  [<ffffffff810999f7>] handle_irq_event_percpu+0x1bf/0x214
[    9.640731]  [<ffffffff81099a88>] handle_irq_event+0x3c/0x5c
[    9.640731]  [<ffffffff8109c139>] handle_fasteoi_irq+0x7a/0xb0
[    9.640731]  [<ffffffff8100400e>] handle_irq+0x1a/0x24
[    9.640731]  [<ffffffff81003d17>] do_IRQ+0x48/0xaf
[    9.640731]  [<ffffffff8142f1ea>] common_interrupt+0x6a/0x6a
[    9.640731]  <EOI>  [<ffffffff8142f952>] ? system_call_fastpath+0x16/0x1b
[    9.640731] handlers:
[    9.640731] [<ffffffffa000d771>] usb_hcd_irq [usbcore]
[    9.640731] [<ffffffffa0306189>] yenta_interrupt [yenta_socket]
[    9.640731] Disabling IRQ #16

The really curious thing is now that irq 16 is _not_ the interrupt for
the i915 driver when using MSI, but it _is_ the interrupt when not
using MSI. So by all indications it seems like gmbus is able to
generate a legacy (shared) interrupt in MSI mode on some
configurations. I've tried to reproduce this and the differentiating
thing seems to be that on unaffected systems no other device uses irq
16 (which seems to be the non-MSI intel gfx interrupt on all gm45).

I have no idea how that even can happen.

To avoid tempting this elephant into a rage, just disable gmbus
interrupt support on gen 4.

v2: Improve the commit message with exact details of what's going on.
Also add a comment in the code to warn against this particular
elephant in the room.

v3: Move the comment explaing how gen4 blows up next to the definition
of HAS_GMBUS_IRQ to keep the code-flow straight. Suggested by Chris
Wilson.

Signed-off-by: Jiri Kosina <jkosina@suse.cz> (v1)
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
References: https://lkml.org/lkml/2013/3/8/325
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2013-03-20 00:03:16 +01:00
..
accessibility
acpi ACPI / glue: Drop .find_bridge() callback from struct acpi_bus_type 2013-03-04 14:23:40 +01:00
amba Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2013-03-03 11:54:39 -08:00
ata ACPI / glue: Drop .find_bridge() callback from struct acpi_bus_type 2013-03-04 14:23:40 +01:00
atm hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
auxdisplay
base ACPI and power management fixes for 3.9-rc2 2013-03-07 14:54:28 -08:00
bcma Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless into for-davem 2013-03-01 13:52:03 -05:00
block Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client 2013-02-28 17:43:09 -08:00
bluetooth Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2013-02-21 17:40:58 -08:00
bus
cdrom
char Fix a circular locking dependency in random's collection of cputime 2013-03-08 14:42:16 -08:00
clk hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
clocksource ImgTec Meta architecture changes for v3.9-rc1 2013-03-03 12:06:09 -08:00
connector proc connector: reject unprivileged listener bumps 2013-02-27 13:08:35 -05:00
cpufreq cpufreq / intel_pstate: Do not load on VM that does not report max P state. 2013-03-06 23:40:11 +01:00
cpuidle
crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2013-02-25 15:56:15 -08:00
dca dca: convert to idr_alloc() 2013-02-27 19:10:15 -08:00
devfreq
dio
dma Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma 2013-03-03 10:20:22 -08:00
edac Merge branch 'linux_next' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-edac 2013-02-28 20:42:33 -08:00
eisa
extcon
firewire firewire: convert to idr_alloc() 2013-02-27 19:10:15 -08:00
firmware Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2013-03-09 16:51:13 -08:00
gpio gpio/gpio-ich: fix ichx_gpio_check_available() return what callers expect 2013-03-02 13:20:21 +00:00
gpu drm/i915: stop using GMBUS IRQs on Gen4 chips 2013-03-20 00:03:16 +01:00
hid Merge branch 'for-3.9/upstream-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2013-03-08 14:42:52 -08:00
hsi hsi: fix kernel-doc warnings 2013-03-01 13:39:00 -08:00
hv Drivers: hv: vmbus: Use the new infrastructure for delivering VMBUS interrupts 2013-02-27 10:15:53 -08:00
hwmon hwmon: (sht15) Check return value of regulator_enable() 2013-03-03 21:45:48 -08:00
hwspinlock
i2c idr: remove MAX_IDR_MASK and move left MAX_IDR_* into idr.c 2013-02-27 19:10:20 -08:00
ide Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-02-26 20:16:07 -08:00
idle Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-02-22 19:25:09 -08:00
iio
infiniband fs: Limit sys_mount to only request filesystem modules. 2013-03-03 19:36:31 -08:00
input Atmel MXT touchscreen: increase reset timeouts 2013-03-09 10:31:01 -08:00
iommu iommu, x86: Add DMA remap fault reason 2013-03-06 09:41:51 +01:00
ipack
irqchip ImgTec Meta architecture changes for v3.9-rc1 2013-03-03 12:06:09 -08:00
isdn Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-03-05 18:42:29 -08:00
leds Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds 2013-02-26 09:29:02 -08:00
lguest All trivial, thanks to the stuff which didn't quite make it time. 2013-02-26 14:49:12 -08:00
macintosh Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2013-02-23 17:09:55 -08:00
mailbox mailbox, pl320-ipc: remove __init from probe function 2013-03-04 14:23:11 +01:00
md md updates for 3.9 2013-03-05 17:22:08 -08:00
media arm-soc: late OMAP changes 2013-02-28 20:00:40 -08:00
memory
memstick memstick: move the dereference below the NULL test 2013-02-27 19:10:23 -08:00
message
mfd mfd: convert to idr_alloc() 2013-02-27 19:10:17 -08:00
misc fs: Limit sys_mount to only request filesystem modules. 2013-03-03 19:36:31 -08:00
mmc Merge branches 'devel-stable', 'fixes' and 'mmci' into for-linus 2013-03-03 00:32:50 +00:00
mtd fs: Limit sys_mount to only request filesystem modules. 2013-03-03 19:36:31 -08:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-03-05 18:42:29 -08:00
nfc
ntb
nubus
of Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2013-02-21 17:40:58 -08:00
oprofile fs: Limit sys_mount to only request filesystem modules. 2013-03-03 19:36:31 -08:00
parisc Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-02-26 20:16:07 -08:00
parport Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2013-02-21 17:54:03 -08:00
pci ACPI / glue: Add .match() callback to struct acpi_bus_type 2013-03-04 14:23:40 +01:00
pcmcia Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2013-02-21 17:40:58 -08:00
pinctrl
platform Platform: x86: chromeos_laptop : Add basic platform data for atmel devices 2013-03-08 16:03:29 -08:00
pnp ACPI / glue: Add .match() callback to struct acpi_bus_type 2013-03-04 14:23:40 +01:00
power power: convert to idr_alloc() 2013-02-27 19:10:18 -08:00
pps drivers/pps/clients/pps-gpio.c: use devm_kzalloc 2013-02-27 19:10:23 -08:00
ps3
ptp
pwm pwm: Changes for v3.9-rc1 2013-02-26 09:34:29 -08:00
rapidio
regulator Merge remote-tracking branch 'regulator/fix/twl' into tmp 2013-03-05 10:12:43 +08:00
remoteproc remoteproc: convert to idr_alloc() 2013-02-27 19:10:18 -08:00
rpmsg rpmsg: convert to idr_alloc() 2013-02-27 19:10:18 -08:00
rtc rtc: stmp3xxx: add wdt-accessor function 2013-03-01 12:40:36 +01:00
s390 qdio: remove unused parameters 2013-02-28 09:37:12 +01:00
sbus Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-02-26 20:16:07 -08:00
scsi ACPI / glue: Add .match() callback to struct acpi_bus_type 2013-03-04 14:23:40 +01:00
sfi
sh
sn
spi
ssb Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux into mips-for-linux-next 2013-02-22 10:07:30 +01:00
staging fs: Limit sys_mount to only request filesystem modules. 2013-03-03 19:36:31 -08:00
target Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2013-03-02 11:43:27 -08:00
tc
thermal Fix mis-merge of intel_powerclamp.c resulting in compile error 2013-02-28 20:23:09 -08:00
tty drivers/tty/hvc: Use strlcpy instead of strncpy 2013-03-05 16:56:27 +11:00
uio uio: convert to idr_alloc() 2013-02-27 19:10:19 -08:00
usb Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2013-03-09 16:51:13 -08:00
uwb
vfio vfio: convert to idr_alloc() 2013-02-27 19:10:19 -08:00
vhost Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2013-02-26 11:42:23 -08:00
video backlight: add new lp8788 backlight driver 2013-02-27 19:10:09 -08:00
virt
virtio All trivial, thanks to the stuff which didn't quite make it time. 2013-02-26 14:49:12 -08:00
vlynq
vme
w1 arm-soc: i.MX DT changes 2013-02-28 19:59:34 -08:00
watchdog watchdog: sp805_wdt depends on ARM 2013-03-01 12:56:26 +01:00
xen fs: Limit sys_mount to only request filesystem modules. 2013-03-03 19:36:31 -08:00
zorro new helper: file_inode(file) 2013-02-22 23:31:31 -05:00
Kconfig
Makefile Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2013-02-23 17:09:55 -08:00