Livio Soares 449d846dbc [POWERPC] Fix performance monitor exception ... To the issue: some point during 2.6.20 development, Paul Mackerras introduced the "lazy IRQ disabling" patch (very cool work, BTW). In that patch, the performance monitor unit exception was marked as "maskable", in the sense that if interrupts were soft-disabled, that exception could be ignored. This broke my PowerPC profiling code. The symptom that I see is that a varying number of interrupts (from 0 to $n$, typically closer to 0) get delivered, when, in reality, it should always be very close to $n$. The issue stems from the way masking is being done. Masking in this fashion seems to work well with the decrementer and external interrupts, because they are raised again until "really" handled. For the PMU, however, this does not apply (at least on my Xserver machine with a 970FX processor). If the PMU exception is not handled, it will _not_ be re-raised (at least on my machine). The documentation states that the PMXE bit in MMCR0 is set to 0 when the PMU exception is raised. However, software must re-set the bit to re-enable PMU exceptions. If the exception is ignored (as currently) not only is that interrupt lost, but because software does not re-set PMXE, the PMU registers are "frozen" forever. [This patch means that performance monitor exceptions are taken and handled even if irqs are off, as long as some other interrupt hasn't come along and caused interrupts to be hard-disabled. In this sense the PMU exception becomes like an NMI. The oprofile code for most powerpc processors does nothing that is unsafe in an NMI context, but the Cell oprofile code does a spin_lock_irqsave. However, that turns out to be OK because Cell doesn't actually use the performance monitor exception; performance monitor interrupts come in as a regular interrupt on Cell, so will be disabled when irqs are off. -- paulus.] Signed-off-by: Paul Mackerras <paulus@samba.org>		2007-02-07 14:03:23 +11:00
..
vdso32	[POWERPC] Support feature fixups in vdso's	2006-10-25 11:54:07 +10:00
vdso64	[POWERPC] Cell timebase bug workaround	2006-10-25 11:54:18 +10:00
align.c	[PATCH] powerpc: Implement support for setting little-endian mode via prctl	2006-06-09 21:24:15 +10:00
asm-offsets.c	[POWERPC] Fix manual assembly WARN_ON() in enter_rtas().	2007-01-09 17:03:02 +11:00
audit.c	[PATCH] audit: AUDIT_PERM support	2006-09-11 13:32:30 -04:00
binfmt_elf32.c	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
btext.c	[POWERPC] Fix various offb issues	2006-11-01 14:52:48 +11:00
compat_audit.c	[PATCH] audit: AUDIT_PERM support	2006-09-11 13:32:30 -04:00
cpu_setup_6xx.S	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
cpu_setup_pa6t.S	[POWERPC] pasemi: Idle loops	2007-02-07 14:03:22 +11:00
cpu_setup_ppc970.S	[POWERPC] powerpc: Enable DEEPNAP power savings mode on 970MP	2006-10-16 16:32:25 +10:00
cputable.c	[POWERPC] pasemi: Idle loops	2007-02-07 14:03:22 +11:00
crash_dump.c	[POWERPC] Make doc comments extractable	2006-08-08 17:07:04 +10:00
crash.c	[PATCH] Kexec / Kdump: Unify elf note code	2006-12-07 08:39:46 -08:00
dma_64.c	[POWERPC] Make direct DMA use node local allocations	2006-12-04 20:38:59 +11:00
entry_32.S	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
entry_64.S	[POWERPC] Fix manual assembly WARN_ON() in enter_rtas().	2007-01-09 17:03:02 +11:00
firmware.c	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
fpu.S	[POWERPC] Restore copyright notice in arch/powerpc/kernel/fpu.S	2006-08-30 14:45:35 +10:00
head_4xx.S	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
head_8xx.S	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
head_32.S	[POWERPC] Remove the broken Gemini support	2007-01-24 21:13:58 +11:00
head_44x.S	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
head_64.S	[POWERPC] Fix performance monitor exception	2007-02-07 14:03:23 +11:00
head_booke.h	[PATCH] powerpc: Fix Kernel FP unavail exception for BookE	2006-02-10 16:51:50 +11:00
head_fsl_booke.S	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
ibmebus.c	[POWERPC] Replace kmalloc+memset with kzalloc	2006-12-04 20:42:09 +11:00
idle_6xx.S	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
idle_power4.S	[POWERPC] Lazy interrupt disabling for 64-bit machines	2006-10-16 16:31:36 +10:00
idle.c	[POWERPC] cell: use ppc_md->power_save instead of cbe_idle_loop	2006-10-25 14:20:22 +10:00
init_task.c	[PATCH] nsproxy: move init_nsproxy into kernel/nsproxy.c	2006-10-02 07:57:20 -07:00
io.c	[POWERPC] Merge 32 and 64 bits asm-powerpc/io.h	2006-12-04 20:39:05 +11:00
iomap.c	[POWERPC] Remove fastcall function attribute	2007-01-26 01:52:27 -06:00
iommu.c	[POWERPC] Refactor 64 bits DMA operations	2006-12-04 20:38:40 +11:00
irq.c	[POWERPC] Add IRQ remapping hook	2007-01-24 21:13:59 +11:00
kprobes.c	[PATCH] kprobes: enable booster on the preemptible kernel	2006-12-07 08:39:38 -08:00
l2cr_6xx.S	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
legacy_serial.c	Merge branch 'merge'	2006-08-25 14:56:07 +10:00
lparcfg.c	[POWERPC] clean up pseries hcall interfaces	2006-08-01 16:19:15 +10:00
lparmap.c	[PATCH] powerpc: Fix iSeries bug in VMALLOCBASE/VMALLOC_START consolidation	2006-01-09 15:06:06 +11:00
machine_kexec_32.c	Storage class should be first	2006-06-26 18:57:34 +02:00
machine_kexec_64.c	Merge branch 'merge'	2006-08-25 14:56:07 +10:00
machine_kexec.c	[POWERPC] Move some kexec logic into machine_kexec.c	2006-08-17 16:41:10 +10:00
Makefile	[POWERPC] pasemi: Idle loops	2007-02-07 14:03:22 +11:00
misc_32.S	[POWERPC] Consolidate feature fixup code	2006-10-25 11:42:10 +10:00
misc_64.S	[POWERPC] pasemi: UART udbg support	2007-02-07 14:03:22 +11:00
misc.S	[POWERPC] convert string i/o operations to C	2006-09-20 14:06:18 +10:00
module_32.c	[POWERPC] Add support for R_PPC_ADDR16_HI relocations	2007-01-24 21:13:58 +11:00
module_64.c	[POWERPC] Generic BUG for powerpc	2006-12-11 16:35:07 +11:00
nvram_64.c	[PATCH] getting rid of all casts of k[cmz]alloc() calls	2006-12-13 09:05:58 -08:00
of_device.c	[POWERPC] of_device_register: propagate device_create_file return code	2006-12-08 02:23:07 -06:00
of_platform.c	[POWERPC] powerpc: add scanning of ebc bus to of_platform	2006-12-19 15:35:40 +01:00
paca.c	[POWERPC] Implement SLB shadow buffer	2006-08-08 17:08:56 +10:00
pci_32.c	[POWERPC] Do not write virq back to PCI config space	2007-01-24 21:13:57 +11:00
pci_64.c	[POWERPC] Do not write virq back to PCI config space	2007-01-24 21:13:57 +11:00
pci_dn.c	[POWERPC] Constify & voidify get_property()	2006-07-31 15:55:04 +10:00
pmc.c	[POWERPC] PA6T PMC support	2007-02-07 14:03:19 +11:00
ppc32.h	powerpc: move include/asm-ppc64/ppc32.h to arch/powerpc/kernel	2005-11-03 16:03:28 +11:00
ppc_ksyms.c	[POWERPC] Compile fixes for arch/powerpc dcr code	2007-02-07 14:03:23 +11:00
proc_ppc64.c	[PATCH] struct path: convert powerpc	2006-12-08 08:28:48 -08:00
process.c	[POWERPC] Better check in show_instructions	2006-10-16 15:53:30 +10:00
prom_init.c	[POWERPC] Support ibm,dynamic-reconfiguration-memory nodes	2006-12-11 13:49:49 +11:00
prom_parse.c	[POWERPC] Workaround oldworld OF bug with IRQs & P2P bridges	2006-12-20 16:37:47 +11:00
prom.c	[POWERPC] arch/ppc/kernel/prom.c of_node_(get|put) cleanup	2007-01-24 21:13:57 +11:00
ptrace32.c	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
ptrace-common.h	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
ptrace.c	[POWERPC] Mask 32-bit system call arguments to 32 bits on PPC64 in audit code	2007-01-24 21:13:58 +11:00
rtas_flash.c	[PATCH] struct path: convert powerpc	2006-12-08 08:28:48 -08:00
rtas_pci.c	[POWERPC] Merge 32 and 64 bits asm-powerpc/io.h	2006-12-04 20:39:05 +11:00
rtas-proc.c	[POWERPC] Constify & voidify get_property()	2006-07-31 15:55:04 +10:00
rtas-rtc.c	[PATCH] powerpc: reorg RTAS delay code	2006-06-09 21:21:06 +10:00
rtas.c	[POWERPC] Add rtas_service_present() helper	2006-12-08 17:10:22 +11:00
semaphore.c	powerpc: Merge enough to start building in arch/powerpc.	2005-09-26 16:04:21 +10:00
setup_32.c	[POWERPC] Distinguish POWER6 partition modes and tell userspace	2006-12-04 20:40:16 +11:00
setup_64.c	[POWERPC] Distinguish POWER6 partition modes and tell userspace	2006-12-04 20:40:16 +11:00
setup-common.c	[POWERPC] Fix xmon=off and cleanup xmon initialisation	2006-10-04 14:52:22 +10:00
setup.h	[PATCH] powerpc: Make early xmon logic immune to location of early parsing	2006-05-19 15:02:12 +10:00
signal_32.c	[POWERPC] Fix register save area alignment for swapcontext syscall	2006-12-20 16:37:49 +11:00
signal_64.c	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
smp-tbsync.c	[POWERPC] Replace kmalloc+memset with kzalloc	2006-12-04 20:42:09 +11:00
smp.c	[PATCH] Change cpu_up and co from __devinit to __cpuinit	2007-01-11 18:18:20 -08:00
swsusp_32.S	[PATCH] Change the name of pagedir_nosave	2006-09-26 08:49:01 -07:00
sys_ppc32.c	[POWERPC] fix missing #include in sys_ppc32.c	2006-12-04 20:41:19 +11:00
syscalls.c	[PATCH] namespaces: utsname: switch to using uts namespaces	2006-10-02 07:57:21 -07:00
sysfs.c	[POWERPC] PA6T PMC support	2007-02-07 14:03:19 +11:00
systbl.S	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
tau_6xx.c	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
time.c	[POWERPC] iSeries: fix time.c for combined build	2006-12-04 20:39:15 +11:00
traps.c	[POWERPC] Use is_init() instead of pid==1	2007-01-24 21:13:56 +11:00
udbg_16550.c	[POWERPC] pasemi: UART udbg support	2007-02-07 14:03:22 +11:00
udbg.c	[POWERPC] pasemi: UART udbg support	2007-02-07 14:03:22 +11:00
vdso.c	[PATCH] slab: remove SLAB_KERNEL	2006-12-07 08:39:24 -08:00
vecemu.c	[PATCH] powerpc: Move arch/ppc*/kernel/vecemu.c to arch/powerpc	2005-09-21 19:21:07 +10:00
vector.S	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
vio.c	[POWERPC] arch/powerpc/kernel/vio.c of_node_put cleanup	2007-01-24 21:13:57 +11:00
vmlinux.lds.S	[POWERPC] Generic BUG for powerpc	2006-12-11 16:35:07 +11:00