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Mark Rutland 5101ef20f0 perf/arm: Special-case hetereogeneous CPUs 
Commit:

  2665784850 ("perf/core: Verify we have a single perf_hw_context PMU")

forcefully prevents multiple PMUs from sharing perf_hw_context, as this
generally doesn't make sense. It is a common bug for uncore PMUs to
use perf_hw_context rather than perf_invalid_context, which this detects.

However, systems exist with heterogeneous CPUs (and hence heterogeneous
HW PMUs), for which sharing perf_hw_context is necessary, and possible
in some limited cases.

To make this work we have to perform some gymnastics, as we did in these
commits:

  66eb579e66 ("perf: allow for PMU-specific event filtering")
  c904e32a69 ("arm: perf: filter unschedulable events")

To allow those systems to work, we must allow PMUs for heterogeneous
CPUs to share perf_hw_context, though we must still disallow sharing
otherwise to detect the common misuse of perf_hw_context.

This patch adds a new PERF_PMU_CAP_HETEROGENEOUS_CPUS for this, updates
the core logic to account for this, and makes use of it in the arm_pmu
code that is used for systems with heterogeneous CPUs. Comments are
added to make the rationale clear and hopefully avoid accidental abuse.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/20160426103346.GA20836@leverpostej
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-05-05 10:13:59 +02:00
..
accessibility
acpi Merge branch 'acpi-processor' 2016-04-02 01:17:36 +02:00
amba
android
ata Merge branch 'for-4.6' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2016-03-18 20:06:46 -07:00
atm Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2016-03-17 21:38:27 -07:00
auxdisplay
base PM / wakeirq: fix wakeirq setting after wakup re-configuration from sysfs 2016-04-07 22:23:47 +02:00
bcma bcma: fix building without OF_IRQ 2016-03-23 17:52:10 +02:00
block rbd: report unsupported features to syslog 2016-04-28 10:07:43 +02:00
bluetooth Bluetooth: btmrvl_sdio: fix firmware activation failure 2016-03-10 19:51:29 +01:00
bus mvebu fixes for 4.6 (part 1) 2016-04-12 12:35:07 -07:00
cdrom
char hwrng: bcm63xx - fix device tree compilation 2016-04-05 20:23:11 +08:00
clk clk: qcom: ipq4019: add some fixed clocks for ddrppl and fepll 2016-03-29 16:31:16 -07:00
clocksource Merge branches 'perf-urgent-for-linus', 'smp-urgent-for-linus' and 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-04-23 11:45:52 -07:00
connector
cpufreq Merge branch 'pm-cpufreq-fixes' 2016-04-29 14:22:25 +02:00
cpuidle cpuidle: menu: Fall back to polling if next timer event is near 2016-03-21 15:50:28 +01:00
crypto crypto: talitos - fix AEAD tcrypt tests 2016-04-20 17:42:49 +08:00
dca
devfreq PM / devfreq: Spelling s/frequnecy/frequency/ 2016-03-17 02:30:16 +01:00
dio
dma Merge branch 'fix/edma' into fixes 2016-04-16 22:52:03 +05:30
dma-buf dma-buf: Update docs for SYNC ioctl 2016-03-21 09:26:45 +01:00
edac EDAC: i7core, sb_edac: Don't return NOTIFY_BAD from mce_decoder callback 2016-04-29 15:43:10 +02:00
eisa
extcon extcon: palmas: Drop stray IRQF_EARLY_RESUME flag 2016-04-04 08:32:45 +09:00
firewire IEEE 1394 subsystem patch: 2016-03-25 08:52:25 -07:00
firmware Merge branch 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-04-28 19:54:50 -07:00
fmc
fpga
gpio gpio: pca953x: Use correct u16 value for register word write 2016-04-08 11:49:47 +02:00
gpu Merge branch 'drm-fixes-4.6' of git://people.freedesktop.org/~agd5f/linux into drm-fixes 2016-04-29 14:31:44 +10:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2016-04-11 12:31:09 -07:00
hsi
hv Char/Misc patches for 4.6-rc1 2016-03-17 13:47:50 -07:00
hwmon hwmon: (max1111) Return -ENODEV from max1111_read_channel if not instantiated 2016-03-27 10:37:48 -07:00
hwspinlock
hwtracing
i2c i2c: exynos5: Fix possible ABBA deadlock by keeping I2C clock prepared 2016-04-22 15:31:54 +02:00
ide ide: palm_bk3710: test clock rate to avoid division by 0 2016-03-20 16:59:27 -04:00
idle intel_idle: Add KBL support 2016-04-07 22:11:08 +02:00
iio Second set of IIO fixes for the 4.6 cycle. 2016-04-04 13:45:10 -07:00
infiniband Final set of -rc fixes for 4.6 2016-04-29 17:07:54 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2016-04-23 11:04:26 -07:00
iommu iommu/arm-smmu: Don't allocate resources for bypass domains 2016-04-21 16:47:32 +02:00
ipack
irqchip irqchip/mips-gic: Don't overrun pcpu_masks array 2016-04-21 21:04:29 +02:00
isdn mISDN: Fixing missing validation in base_sock_bind() 2016-04-13 23:00:50 -04:00
leds platform-drivers-x86 for 4.6-1 2016-03-23 17:20:59 -07:00
lguest lguest, x86/entry/32: Fix handling of guest syscalls using interrupt gates 2016-04-01 08:58:13 +02:00
lightnvm lightnvm: do not load L2P table if not supported 2016-03-18 18:10:38 -07:00
macintosh
mailbox Merge branch 'mailbox-devel' of git://git.linaro.org/landing-teams/working/fujitsu/integration 2016-04-14 18:40:47 -07:00
mcb
md dm cache metadata: fix cmd_read_lock() acquiring write lock 2016-04-17 11:24:46 -04:00
media media fixes for v4.6-rc6 2016-04-28 19:44:47 -07:00
memory MTD updates for v4.6 2016-03-24 19:57:15 -07:00
memstick drivers/memstick/host/r592.c: avoid gcc-6 warning 2016-03-25 16:37:42 -07:00
message
mfd - New Drivers 2016-03-18 10:15:11 -07:00
misc powerpc fixes for 4.6 #3 2016-04-29 18:50:08 -07:00
mmc mmc: sunxi: Disable eMMC HS-DDR (MMC_CAP_1_8V_DDR) for Allwinner A80 2016-04-28 11:43:54 +02:00
mtd One MTD fix for v4.6-rc4: 2016-04-15 15:25:09 -07:00
net net/mlx4_en: fix spurious timestamping callbacks 2016-04-26 01:13:18 -04:00
nfc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2016-03-19 10:05:34 -07:00
ntb NTB: Remove _addr functions from ntb_hw_amd 2016-03-26 11:44:33 -04:00
nubus
nvdimm libnvdimm, pmem: clarify the write+clear_poison+write flow 2016-04-15 14:59:41 -06:00
nvme NVMe: Always use MSI/MSI-x interrupts 2016-04-14 14:04:50 -06:00
nvmem
of DeviceTree updates for 4.6: 2016-03-19 15:15:07 -07:00
oprofile mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
parisc PCI changes for the v4.6 merge window: 2016-03-16 14:45:55 -07:00
parport
pci PCI updates for v4.6: 2016-04-18 19:52:47 -07:00
pcmcia pcmcia: db1xxx_ss: fix last irq_to_gpio user 2016-03-29 22:48:53 +02:00
perf perf/arm: Special-case hetereogeneous CPUs 2016-05-05 10:13:59 +02:00
phy phy: rockchip-emmc: should be a child device of the GRF 2016-04-13 18:33:05 +05:30
pinctrl pinctrl: single: Fix pcs_parse_bits_in_pinctrl_entry to use __ffs than ffs 2016-04-15 11:26:55 +02:00
platform platform-drivers-x86 for 4.6-3 2016-04-27 08:57:11 -07:00
pnp
power Power management and ACPI material for v4.6-rc1, part 2 2016-03-25 16:55:37 -07:00
powercap powercap, perf/x86/intel/rapl: Add PSys support 2016-04-28 10:39:19 +02:00
pps
ps3
ptp Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-03-15 12:13:56 -07:00
pwm pwm: fsl-ftm: Use flat regmap cache 2016-04-14 16:54:00 +02:00
rapidio rapidio: fix potential NULL pointer dereference 2016-04-28 19:34:04 -07:00
ras
regulator - New Drivers 2016-03-18 10:15:11 -07:00
remoteproc remoteproc: st: fix check of syscon_regmap_lookup_by_phandle() return value 2016-03-28 16:19:00 -07:00
reset
rpmsg
rtc rtc: ds1307: Use irq when available for wakeup-source device 2016-04-21 23:21:00 +02:00
s390 s390/sclp_ctl: fix potential information leak with /dev/sclp 2016-04-27 09:33:39 +02:00
sbus
scsi cxgbi: fix uninitialized flowi6 2016-04-25 16:20:49 -04:00
sfi
sh
sn
soc Revert "soc: mediatek: SCPSYS: Fix double enabling of regulators" 2016-04-13 11:55:08 +02:00
spi Merge remote-tracking branches 'spi/fix/omap2' and 'spi/fix/rockchip' into spi-linus 2016-04-04 10:05:49 -07:00
spmi
ssb
staging Final set of -rc fixes for 4.6 2016-04-29 17:07:54 -07:00
target target: add a new add_wwn_groups fabrics method 2016-03-30 20:06:44 -07:00
tc
thermal thermal: use %d to print S32 parameters 2016-04-27 15:54:51 -07:00
thunderbolt
tty devpts: more pty driver interface cleanups 2016-04-26 15:47:32 -07:00
uio
usb usb: gadget: f_fs: Fix use-after-free 2016-04-20 10:38:06 +03:00
uwb
vfio VFIO updates for v4.6-rc1 2016-03-17 13:05:09 -07:00
vhost Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2016-03-22 12:41:14 -07:00
video omapfb: panel-sharp-ls037v7dw01: fix check of gpio_to_desc() return value 2016-04-18 12:18:37 +03:00
virt
virtio virtio: virtio 1.0 cs04 spec compliance for reset 2016-04-07 15:16:39 +03:00
vlynq
vme
w1
watchdog hpwdt: use nmi_panic() when kernel panics in NMI handler 2016-03-22 15:36:02 -07:00
xen xen/events: Mask a moving irq 2016-04-04 11:18:00 +01:00
zorro
Kconfig
Makefile