Instead of creating idle threads at boot for all possible CPUs, we
create them on demand, like x86 or ARM, and we properly call init_idle
to re-initialize an idle thread when a CPU was unplugged and is now
re-plugged.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Instead, keep it static, expose an accessor and use that from
the PowerMac code. Avoids easy namespace collisions and will
make it easier to consolidate with other implementations.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
On some machines that use i2c to synchronize the timebases (such
as PowerMac7,2/7,3 G5 machines), hotplug CPU would crash when
putting back a new CPU online due to the underlying i2c bus being
closed.
This uses the newly added bringup_done() callback to move the close
along with other housekeeping calls, and adds a CPU notifier to
re-open the i2c bus around subsequent hotplug operations
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This allows us to stop abusing smp_ops->setup_cpu() for cleanup
tasks that have to take place after the initial boot time CPU
bringup.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
The current code soft-disables, and then goes to NAP mode which
turns interrupts on. That means that if an interrupt occurs, we
will hit the masked interrupt code path which isn't what we want,
as it will return with EE off, which will either get us out of
NAP mode, or fail to enter it (according to spec).
Instead, let's just rely on the fact that it is safe to take
decrementer interrupts on an offline CPU and leave interrupts
enabled. We can also get rid of the special case in asm for
power4_cpu_offline_powersave() and just use power4_idle().
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Those instructions do nothing on non-threaded processors such
as 970's used on those machines.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Use the generic code, just add the MPIC priority setting,
I don't see any use in mucking around with the decrementer,
as 32-bit will have EE off all along, and 64-bit will be able
to deal with it.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Use generic cpu_state, call idle_task_exit() properly, and
remove smp_core99_cpu_die() which isn't useful, the generic
function does the job just fine.
Remove the last remnants of cpu_enable(), everybody uses the normal
__cpu_up() path now
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This is used by some "soft" hotplug implementations. I needs to
call idle_task_exit() when the CPU is going away, and we remove
the now no-longer needed set_cpu_online() and local_irq_enable()
which are handled by the return to start_secondary
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Various thing are torn down when a CPU is hot-unplugged. That CPU
is expected to go back to start_secondary when re-plugged to re
initialize everything, such as clock sources, maps, ...
Some implementations just return from cpu_die() callback
in the idle loop when the CPU is "re-plugged". This is not enough.
We fix it using a little asm trampoline which resets the stack
and calls back into start_secondary as if we were all fresh from
boot. The trampoline already existed on ppc64, but we add it for
ppc32
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
With some implementations, it is possible that a timer interrupt
occurs every few seconds on an offline CPU. In this case, just
re-arm the decrementer and return immediately
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
* 'irq-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
avr32: Fix missing irq namespace conversion
powerpc: qe_ic: Rename get_irq_desc_data and get_irq_desc_chip
genirq: Remove the now obsolete config options and select statements
arm: versatile : Fix typo introduced in irq namespace cleanup
sound: Fixup the last user of the old irq functions
genirq: Remove obsolete comment
genirq: Remove now obsolete set_irq_wake()
sh: Fix irq cleanup fallout
x86: apb_timer: Fixup genirq fallout
genirq: Fix misnamed label in handle_edge_eoi_irq
Fix up crazy conflict in arch/powerpc/include/asm/qe_ic.h:
- commit eead4d5c63 ("powerpc: qe_ic: Rename get_irq_desc_data and
get_irq_desc_chip") made the helper functions use
irq_desc_get_handler_data() instead of the legacy (and no longer
existing) get_irq_desc_data.
- commit d4db35e8dc ("powerpc/qe_ic: Fix another breakage from the
irq_data conversion") used irq_desc_get_chip_data() instead.
According to Thomas, the former is the correct direct conversion, but it
does look like both should work (arch/powerpc/sysdev/qe_lib/qe_ic.c
seems to initialize both to the same thing), and the chip data in some
ways is the more logical. Somebody should really decide on one of the
other.
This merge picks irq_desc_get_handler_data() as the straightforward pure
conversion to new names, as per Thomas.
* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
powerpc/qe_ic: Fix another breakage from the irq_data conversion
powerpc/8xx: Fix another breakage from the irq_data conversion
powerpc/cell: Use handle_edge_eoi_irq for real
powerpc/pseries: Enable Chelsio network and iWARP drivers
powerpc/mm: Move the STAB0 location to 0x8000 to make room in low memory
powerpc: Fix accounting of softirq time when idle
powerpc/pseries/smp: query-cpu-stopped-state support won't change
powerpc/xics: Use hwirq for xics domain irq number
powerpc/xics: Fix numberspace mismatch from irq_desc conversion
powerpc: Wire up new syscalls
powerpc/booke: Correct the SPRN_MAS5 definition.
powerpc: ARCH_PFN_OFFSET should be unsigned long
powerpc: Implement dma_mmap_coherent()
powerpc/nvram: Don't overwrite oops/panic report on normal shutdown
powerpc: Restore some misc devices to our configs
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/vapier/blackfin:
Blackfin: bitops: fix include order after little endian inclusion
Blackfin: defconfigs: update after misc devices defaulted to N
Blackfin: use more standard pr_fmt in the module loader
These two functions disappeared in commit
0c6f8a8b91
"genirq: Remove compat code"
but they still exist in qe_ic.h.
This patch renames the function to their new names.
Signed-off-by: Richard Cochran <richard.cochran@omicron.at>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: Lennert Buytenhek <buytenh@secretlab.ca>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
LKML-Reference: <20110330132504.GA31832@riccoc20.at.omicron.at>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Commit 6845664(arm: Cleanup the irq namespace) introduces a typo
causing a build failure for the versatile platform.
[ tglx: Sorry, my bad. Have no idea how I fatfingered that ]
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: linux-arm-kernel@lists.infradead.org
LKML-Reference: <20110330060229.27397.7628.stgit@ponder>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Latest irq changes removed the need for this forcing flag, and the
definition - but missed the code that allowed it to be tweaked via
/proc. Delete accessor functions too.
Signed-off-by: Tony Luck <tony.luck@intel.com>
Ensure the Chelsio T3/T4 network drivers and iWARP drivers are
enabled in the pseries config.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Recent upstream builds with allmodconfig fail due to lack of space
between 0x3000 and 0x6000. We have a hard block at 0x7000 but we can
spare a page by moving the STAB0 from 0x6000 to 0x8000.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
commit cf9efce0ce (powerpc: Account time using timebase rather
than PURR) used in_irq() to detect if the time was spent in
interrupt processing. This only catches hardirq context so if we
are in softirq context and in the idle loop we end up accounting it
as idle time. If we instead use in_interrupt() we catch both softirq
and hardirq time.
The issue was found when running a network intensive workload. top
showed the following:
0.0%us, 1.1%sy, 0.0%ni, 85.7%id, 0.0%wa, 9.9%hi, 3.3%si, 0.0%st
85.7% idle. But this was wildly different to the perf events data.
To confirm the suspicion I ran something to keep the core busy:
# yes > /dev/null &
8.2%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 10.3%hi, 81.4%si, 0.0%st
We only got 8.2% of the CPU for the userspace task and softirq has
shot up to 81.4%.
With the patch below top shows the correct stats:
0.0%us, 0.0%sy, 0.0%ni, 5.3%id, 0.0%wa, 13.3%hi, 81.3%si, 0.0%st
Signed-off-by: Anton Blanchard <anton@samba.org>
Cc: stable@kernel.org
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
If a given firmware doesn't have a token to support query-cpu-stopped-state,
its not likely to change during the lifetime of the kernel.
Only print this information once, not once per secondary thread.
While here, make the line wrap grep friendly.
Signed-off-by: Milton Miller <miltonm@bga.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To try to avoid future confusion, rename irq to hwirq when it refers
to a xics domain number instead of a linux irq number.
Signed-off-by: Milton Miller <miltonm@bga.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
commit 79f26c268e (powerpc:
platforms/pseries irq_data conversion) pushed irq_desc down into many
functions, dererencing the descriptor irq field as late as possible.
But it incorrectly passed a linix virtural irq number to RTAS,
resulting in the interrupt not being disabled and possibly
other bad things, such as another interrupt being disabled and/or
a checkstop.
In addition this missed the point of xics_mask_unknown_vec and
the seperation of xics_mask_real_irq from xics_mask_irq. When
xics_mask_unknown_vec is called it's because the hardware delivered an
irq source for which we have no linux irq allocated, and thefore we can
not have an irq_desc allocated.
Revert xics_mask_real_irq to its prior version, naming the argument
hwirq to highlight the difference.
Signed-off-by: Milton Miller <miltonm@bga.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
These syscalls have been added recently:
name_to_handle_at
open_by_handle_at
clock_adjtime
syncfs
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
339 is the SPR number for MAS5 documented by Power ISA 2.06, and
implemented by e500mc. It is not yet used anywhere in the kernel,
so nothing should be relying on the wrong number.
Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
pfns are unsigned long, but MEMORY_START is phys_addr_t. This leads
to page_to_pfn() returning phys_addr_t, and thus type mismatches in a few
print statements.
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This is used by Alsa to mmap buffers allocated with dma_alloc_coherent()
into userspace. We need a special variant to handle machines with
non-coherent DMAs as those buffers have "special" virt addresses and
require non-cachable mappings
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
For normal halt, reboot, and poweroff events, refrain from overwriting
the lnx,oops-log partition. Also, don't save the dmesg buffer on an
emergency-restart event if we've already saved it earlier in panic().
Signed-off-by: Jim Keniston <jkenisto@us.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Uwe Kleine-König reported:
while working on an defconfig (arm/mx27) I noticed that just updating
it[1] results in removing CONFIG_EEPROM_AT24=y. The reason is that
since commit
v2.6.36-5965-g5f2365d (misc devices: do not enable by default)
MISC_DEVICES isn't enabled anymore by default. So all defconfigs that
have CONFIG_SOME_SYMBOL=y (or =m) (with SOME_SYMBOL depending on
MISC_DEVICES) but not CONFIG_MISC_DEVICES=y suffer from the same
problem.
This restores those misc devices to the powerpc defconfigs.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de
Acked-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Acked-by: Uwe Kleine-König
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
The lonely user of the internal interface was not in the coccinelle
script.
Reported-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc: (26 commits)
mmc: SDHI should depend on SUPERH || ARCH_SHMOBILE
mmc: tmio_mmc: Move some defines into a shared header
mmc: tmio: support aggressive clock gating
mmc: tmio: fix power-mode interpretation
mmc: tmio: remove work-around for unmasked SDIO interrupts
sh: fix SDHI IO address-range
ARM: mach-shmobile: fix SDHI IO address-range
mmc: tmio: only access registers above 0xff, if available
mfd: remove now redundant sh_mobile_sdhi.h header
sh: convert boards to use linux/mmc/sh_mobile_sdhi.h
ARM: mach-shmobile: convert boards to use linux/mmc/sh_mobile_sdhi.h
mmc: tmio: convert the SDHI MMC driver from MFD to a platform driver
sh: ecovec: use the CONFIG_MMC_TMIO symbols instead of MFD
mmc: tmio: split core functionality, DMA and MFD glue
mmc: tmio: use PIO for short transfers
mmc: tmio-mmc: Improve DMA stability on sh-mobile
mmc: fix mmc_app_send_scr() for dma transfer
mmc: sdhci-esdhc: enable esdhc on imx53
mmc: sdhci-esdhc: use writel/readl as general APIs
mmc: sdhci: add the abort CMDTYPE bits definition
...
* 'frv' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-frv:
FRV: Use generic show_interrupts()
FRV: Convert genirq namespace
frv: Select GENERIC_HARDIRQS_NO_DEPRECATED
frv: Convert cpu irq_chip to new functions
frv: Convert mb93493 irq_chip to new functions
frv: Convert mb93093 irq_chip to new function
frv: Convert mb93091 irq_chip to new functions
frv: Fix typo from __do_IRQ overhaul
frv: Remove stale irq_chip.end
FRV: Do some cleanups
FRV: Missing node arg in alloc_thread_info_node() macro
NOMMU: implement access_remote_vm
NOMMU: support SMP dynamic percpu_alloc
NOMMU: percpu should use is_vmalloc_addr().
Fix section mismatch warnings:
set_phys_range_identity() is called by __init xen_set_identity(),
so also mark set_phys_range_identity() as __init.
then:
__early_alloc_p2m() is called set_phys_range_identity(), so also mark
__early_alloc_p2m() as __init.
WARNING: arch/x86/built-in.o(.text+0x7856): Section mismatch in reference from the function __early_alloc_p2m() to the function .init.text:extend_brk()
The function __early_alloc_p2m() references
the function __init extend_brk().
This is often because __early_alloc_p2m lacks a __init
annotation or the annotation of extend_brk is wrong.
WARNING: arch/x86/built-in.o(.text+0x7967): Section mismatch in reference from the function set_phys_range_identity() to the function .init.text:extend_brk()
The function set_phys_range_identity() references
the function __init extend_brk().
This is often because set_phys_range_identity lacks a __init
annotation or the annotation of extend_brk is wrong.
[v2: Per Stephen Hemming recommonedation made __early_alloc_p2m static]
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Convert to new function names. Converted with coccinelle.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: David Howells <dhowells@redhat.com>
