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d6d2e9388f
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Mikulas Patocka d6d2e9388f powernow-k6: disable cache when changing frequency 
commit e20e1d0ac0 upstream.

I found out that a system with k6-3+ processor is unstable during network
server load. The system locks up or the network card stops receiving. The
reason for the instability is the CPU frequency scaling.

During frequency transition the processor is in "EPM Stop Grant" state.
The documentation says that the processor doesn't respond to inquiry
requests in this state. Consequently, coherency of processor caches and
bus master devices is not maintained, causing the system instability.

This patch flushes the cache during frequency transition. It fixes the
instability.

Other minor changes:
* u64 invalue changed to unsigned long because the variable is 32-bit
* move the logic to set the multiplier to a separate function
  powernow_k6_set_cpu_multiplier
* preserve lower 5 bits of the powernow port instead of 4 (the voltage
  field has 5 bits)
* mask interrupts when reading the multiplier, so that the port is not
  open during other activity (running other kernel code with the port open
  shouldn't cause any misbehavior, but we should better be safe and keep
  the port closed)

This patch should be backported to all stable kernels. If it doesn't
apply cleanly, change it, or ask me to change it.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-04-14 06:47:22 -07:00
..
accessibility
acpi ACPI / sleep: Add extra checks for HW Reduced ACPI mode sleep states 2014-03-23 21:44:12 -07:00
amba
ata libata: use wider match for blacklisting Crucial M500 2014-03-23 21:44:10 -07:00
atm atm: idt77252: fix dev refcnt leak 2013-11-19 15:53:02 -05:00
auxdisplay
base PM / hibernate: Fix restore hang in freeze_processes() 2014-03-06 22:06:29 -08:00
bcma Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2013-11-13 17:40:34 +09:00
block mm: close PageTail race 2014-04-03 12:02:37 -07:00
bluetooth Bluetooth: Add support for Toshiba Bluetooth device [0930:0220] 2013-12-04 11:11:49 -02:00
bus Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2013-11-14 08:51:29 +09:00
cdrom
char raw: test against runtime value of max_raw_minors 2014-02-22 13:34:46 -08:00
clk clk: clk-divider: fix divisor > 255 bug 2014-01-08 08:33:12 -08:00
clocksource clocksource: vf_pit_timer: use complement for sched_clock reading 2014-03-31 10:05:13 -07:00
connector connector: improved unaligned access error fix 2013-11-14 17:19:20 -05:00
cpufreq powernow-k6: disable cache when changing frequency 2014-04-14 06:47:22 -07:00
cpuidle ARM/cpuidle: remove __init tag from Calxeda cpuidle probe function 2013-12-30 11:55:20 +01:00
crypto crypto: ixp4xx - Fix kernel compile error 2014-01-01 14:06:23 +08:00
dca
devfreq Merge branch 'pm-devfreq' 2013-11-07 19:24:20 +01:00
dio
dma dma: ste_dma40: don't dereference free:d descriptor 2014-03-06 22:06:29 -08:00
edac i7300_edac: Fix device reference count 2014-03-06 22:06:29 -08:00
eisa Revert "EISA: Initialize device before its resources" 2014-02-13 13:55:27 -08:00
extcon extcon: gpio: Request gpio pin before modifying its state 2014-01-29 05:06:18 -08:00
firewire firewire: don't use PREPARE_DELAYED_WORK 2014-03-23 21:44:10 -07:00
firmware Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-12-29 13:35:04 -08:00
fmc
gpio GPIO fixes for the v3.13 development cycle: 2013-12-17 11:47:40 -08:00
gpu drm/i915: Undo gtt scratch pte unmapping again 2014-04-03 12:02:36 -07:00
hid HID: hidraw: fix warning destroying hidraw device files after parent 2014-03-31 10:05:13 -07:00
hsi
hv Drivers: hv: vmbus: Don't timeout during the initial connection with host 2014-02-22 13:34:53 -08:00
hwmon hwmon: (max1668) Fix writing the minimum temperature 2014-03-06 22:06:25 -08:00
hwspinlock
i2c i2c: cpm: Fix build by adding of_address.h and of_irq.h 2014-04-03 12:02:36 -07:00
ide More ACPI and power management updates for 3.13-rc1 2013-11-20 13:25:04 -08:00
idle intel_idle: close avn_cstates array with correct marker 2014-01-10 03:06:06 +01:00
iio iio:gyro: bug on L3GD20H gyroscope support 2014-03-06 22:06:26 -08:00
infiniband iser-target: Fix command leak for tx_desc->comp_llnode_batch 2014-03-23 21:44:13 -07:00
input Input: cypress_ps2 - don't report as a button pads 2014-04-03 12:02:35 -07:00
iommu iommu/arm-smmu: set CBARn.BPSHCFG to NSH for s1-s2-bypass contexts 2014-03-06 22:06:26 -08:00
ipack
irqchip irq-metag*: stop set_affinity vectoring to offline cpus 2014-03-06 22:06:29 -08:00
isdn isdnloop: several buffer overflows 2014-04-14 06:47:22 -07:00
leds leds: lp5521/5523: Remove duplicate mutex 2014-01-10 14:48:07 -08:00
lguest x86, asmlinkage, lguest: Pass in globals into assembler statement 2013-11-07 12:13:05 +10:30
macintosh powerpc/windfarm: Fix XServe G5 fan control Makefile issue 2013-11-27 11:35:47 +11:00
mailbox
md dm cache: fix access beyond end of origin device 2014-03-23 21:44:17 -07:00
media media: cx18: check for allocation failure in cx18_read_eeprom() 2014-03-31 10:05:14 -07:00
memory
memstick tree-wide: use reinit_completion instead of INIT_COMPLETION 2013-11-15 09:32:21 +09:00
message drivers/message/i2o/driver.c: add missing destroy_workqueue() on error in i2o_driver_register() 2013-11-13 12:09:26 +09:00
mfd ASoC: da9055: Fix device registration of PMIC and CODEC devices 2014-03-06 22:06:18 -08:00
misc mei: set client's read_cb to NULL when flow control fails 2014-03-06 22:06:24 -08:00
mmc Fix uses of dma_max_pfn() when converting to a limiting address 2014-03-31 10:05:15 -07:00
mtd mtd: nand: omap: fix ecclayout->oobfree->length 2014-03-06 22:06:25 -08:00
net net: vxlan: fix crash when interface is created with no group 2014-04-14 06:47:22 -07:00
nfc
ntb NTB driver bug fixes to address a missed call to pci_enable_msix, 2013-11-26 11:15:12 -08:00
nubus
of of: fix PCI bus match for PCIe slots 2014-02-22 13:34:45 -08:00
oprofile
parisc
parport parport: parport_pc: remove double PCI ID for NetMos 2014-02-06 11:34:01 -08:00
pci PCI: Enable INTx in pci_reenable_device() only when MSI/MSI-X not enabled 2014-03-23 21:44:16 -07:00
pcmcia DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
phy phy: kconfig: add depends on "USB_PHY" to OMAP_USB2 and TWL4030_USB 2013-12-10 12:53:30 -08:00
pinctrl pinctrl: sunxi: use chained_irq_{enter, exit} for GIC compatibility 2014-03-23 21:44:07 -07:00
platform hp_accel: Add a new PnP ID HPQ6007 for new HP laptops 2014-02-06 11:34:06 -08:00
pnp PNP / ACPI: proper handling of ACPI IO/Memory resource parsing failures 2014-03-23 21:44:20 -07:00
power power: max17040: Fix NULL pointer dereference when there is no platform_data 2014-02-22 13:34:59 -08:00
powercap powercap / RAPL: add support for ValleyView Soc 2013-12-22 01:27:51 +01:00
pps drivers/pps/clients/pps-gpio.c: remove redundant of_match_ptr 2013-11-13 12:09:35 +09:00
ps3
ptp
pwm
rapidio rapidio/tsi721: fix tasklet termination in dma channel release 2014-03-23 21:43:59 -07:00
regulator regulator: core: Replace direct ops->disable usage 2014-03-31 10:05:15 -07:00
remoteproc
reset
rpmsg
rtc rtc-cmos: Add an alarm disable quirk 2014-02-13 13:55:46 -08:00
s390 s390/3270: fix allocation of tty3270_screen structure 2013-12-18 17:35:30 +01:00
sbus
scsi Fix uses of dma_max_pfn() when converting to a limiting address 2014-03-31 10:05:15 -07:00
sfi
sh
sn
spi spi: spi-ath79: fix initial GPIO CS line setup 2014-03-23 21:44:11 -07:00
ssb
staging zram: avoid null access when fail to alloc meta 2014-03-23 21:43:58 -07:00
target iscsi-target: Fix iscsit_get_tpg_from_np tpg_state bug 2014-03-23 21:44:13 -07:00
tc
thermal x86_pkg_temp_thermal: Do not expose as a hwmon device 2014-03-23 21:44:08 -07:00
tty serial: omap-serial: Move info message to probe function 2014-02-22 13:34:49 -08:00
uio uio: fix devm_request_irq usage 2014-02-06 11:34:00 -08:00
usb xhci: Fix resume issues on Renesas chips in Samsung laptops 2014-03-31 10:05:16 -07:00
uwb Driver Core / sysfs patches for 3.13-rc1 2013-11-07 11:42:15 +09:00
vfio mm: close PageTail race 2014-04-03 12:02:37 -07:00
vhost vhost: validate vhost_get_vq_desc return value 2014-04-14 06:47:21 -07:00
video xen/pvhvm: If xen_platform_pci=0 is set don't blow up (v4). 2014-02-13 13:55:28 -08:00
virt
virtio virtio_balloon: update_balloon_size(): update correct field 2013-12-05 13:12:39 +10:30
vlynq
vme VME: Correct read/write alignment algorithm 2014-02-22 13:34:53 -08:00
w1 drivers/w1/masters/w1-gpio.c: use dev_get_platdata() 2013-11-15 09:32:21 +09:00
watchdog sc1200_wdt: Fix oops 2013-12-10 08:48:15 +01:00
xen xen/balloon: flush persistent kmaps in correct position 2014-04-03 12:02:35 -07:00
zorro
Kconfig ACPI and power management updates for 3.13-rc1 2013-11-14 13:41:48 +09:00
Makefile ACPI and power management updates for 3.13-rc1 2013-11-14 13:41:48 +09:00