09 Sep, 2013
1 commit
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Change the hash algorithm a bit so it produces only values in the
range of 0..31.
This allows to reduce the size of the external interrupt handler hash
array even further while making sure that each of the known interrupt
sources keeps its unique hash with the slightly modified algorithm:0x1004 --> 12
0x1201 --> 10
0x1202 --> 11
0x1406 --> 16
0x1407 --> 17
0x2401 --> 19
0x2603 --> 22
0x4000 --> 0This also means that the entire array now fits into exactly one cache
line; so add a proper align statement as well.Signed-off-by: Heiko Carstens
07 Sep, 2013
1 commit
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Make various functions static, add declarations to header files to
fix a couple of sparse findings.Signed-off-by: Heiko Carstens
04 Sep, 2013
2 commits
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Let's not add a function for every external interrupt subclass for
which we need reference counting. Just have two register/unregister
functions which have a subclass parameter:void irq_subclass_register(enum irq_subclass subclass);
void irq_subclass_unregister(enum irq_subclass subclass);Signed-off-by: Heiko Carstens
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Use hlists for the hashed array of external interrupt handlers.
Reduces the size of the array by 50% (2KB).Signed-off-by: Heiko Carstens
22 Aug, 2013
1 commit
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With the introduction of PCI it became apparent that s390 should
convert to generic hardirqs as too many drivers do not have the
correct dependency for GENERIC_HARDIRQS. On the architecture
level s390 does not have irq lines. It has external interrupts,
I/O interrupts and adapter interrupts. This patch hard-codes all
external interrupts as irq #1, all I/O interrupts as irq #2 and
all adapter interrupts as irq #3. The additional information from
the lowcore associated with the interrupt is stored in the
pt_regs of the interrupt frame, where the interrupt handler can
pick it up. For PCI/MSI interrupts the adapter interrupt handler
scans the relevant bit fields and calls generic_handle_irq with
the virtual irq number for the MSI interrupt.Reviewed-by: Sebastian Ott
Signed-off-by: Martin Schwidefsky
27 Jun, 2013
1 commit
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Copy the interrupt parameters from the lowcore to the pt_regs structure
in entry[64].S and reduce the arguments of the low level interrupt handler
to the pt_regs pointer only. In addition move the test-pending-interrupt
loop from do_IRQ to entry[64].S to make sure that interrupt information
is always delivered via pt_regs.Signed-off-by: Martin Schwidefsky
19 Jun, 2013
1 commit
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In uniprocessor configurations, synchronize_irq() is defined in
as a macro, and this function definition fails to
compile.Reported-by: kbuild test robot
Signed-off-by: Ben Hutchings
Cc: stable@vger.kernel.org # 3.9
Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky
10 Jun, 2013
1 commit
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All architectures must implement IRQ functions. Since various
dependencies on !S390 were removed, there are various drivers that can
be selected but will fail to link. Provide a dummy implementation of
these functions for the !PCI case.Signed-off-by: Ben Hutchings
Cc: stable@vger.kernel.org # 3.9
Acked-by: David S. Miller
Signed-off-by: Martin Schwidefsky
02 May, 2013
1 commit
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Pull VFS updates from Al Viro,
Misc cleanups all over the place, mainly wrt /proc interfaces (switch
create_proc_entry to proc_create(), get rid of the deprecated
create_proc_read_entry() in favor of using proc_create_data() and
seq_file etc).7kloc removed.
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (204 commits)
don't bother with deferred freeing of fdtables
proc: Move non-public stuff from linux/proc_fs.h to fs/proc/internal.h
proc: Make the PROC_I() and PDE() macros internal to procfs
proc: Supply a function to remove a proc entry by PDE
take cgroup_open() and cpuset_open() to fs/proc/base.c
ppc: Clean up scanlog
ppc: Clean up rtas_flash driver somewhat
hostap: proc: Use remove_proc_subtree()
drm: proc: Use remove_proc_subtree()
drm: proc: Use minor->index to label things, not PDE->name
drm: Constify drm_proc_list[]
zoran: Don't print proc_dir_entry data in debug
reiserfs: Don't access the proc_dir_entry in r_open(), r_start() r_show()
proc: Supply an accessor for getting the data from a PDE's parent
airo: Use remove_proc_subtree()
rtl8192u: Don't need to save device proc dir PDE
rtl8187se: Use a dir under /proc/net/r8180/
proc: Add proc_mkdir_data()
proc: Move some bits from linux/proc_fs.h to linux/{of.h,signal.h,tty.h}
proc: Move PDE_NET() to fs/proc/proc_net.c
...
10 Apr, 2013
1 commit
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Signed-off-by: Al Viro
18 Mar, 2013
1 commit
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Signed-off-by: Masanari Iida
Signed-off-by: Jiri Kosina
25 Feb, 2013
1 commit
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Pull KVM updates from Marcelo Tosatti:
"KVM updates for the 3.9 merge window, including x86 real mode
emulation fixes, stronger memory slot interface restrictions, mmu_lock
spinlock hold time reduction, improved handling of large page faults
on shadow, initial APICv HW acceleration support, s390 channel IO
based virtio, amongst others"* tag 'kvm-3.9-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (143 commits)
Revert "KVM: MMU: lazily drop large spte"
x86: pvclock kvm: align allocation size to page size
KVM: nVMX: Remove redundant get_vmcs12 from nested_vmx_exit_handled_msr
x86 emulator: fix parity calculation for AAD instruction
KVM: PPC: BookE: Handle alignment interrupts
booke: Added DBCR4 SPR number
KVM: PPC: booke: Allow multiple exception types
KVM: PPC: booke: use vcpu reference from thread_struct
KVM: Remove user_alloc from struct kvm_memory_slot
KVM: VMX: disable apicv by default
KVM: s390: Fix handling of iscs.
KVM: MMU: cleanup __direct_map
KVM: MMU: remove pt_access in mmu_set_spte
KVM: MMU: cleanup mapping-level
KVM: MMU: lazily drop large spte
KVM: VMX: cleanup vmx_set_cr0().
KVM: VMX: add missing exit names to VMX_EXIT_REASONS array
KVM: VMX: disable SMEP feature when guest is in non-paging mode
KVM: Remove duplicate text in api.txt
Revert "KVM: MMU: split kvm_mmu_free_page"
...
08 Jan, 2013
3 commits
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Count CPU Restart events and make them visible via /proc/interrupts.
Every CPU hotplug (online) event will increase the per cpu counter.Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky -
Now that irq sum accounting for /proc/stat's "intr" line works again we
have the oddity that the sum field (first field) contains only the sum
of the second (external irqs) and third field (I/O interrupts).
The reason for that is that these two fields are already sums of all other
fields. So if we would sum up everything we would count every interrupt
twice.
This is broken since the split interrupt accounting was merged two years
ago: 052ff461c8427629aee887ccc27478fc7373237c "[S390] irq: have detailed
statistics for interrupt types".
To fix this remove the split interrupt fields from /proc/stat's "intr"
line again and only have them in /proc/interrupts.This restores the old behaviour, seems to be the only sane fix and mimics
a behaviour from other architectures where /proc/interrupts also contains
more than /proc/stat's "intr" line does.Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky -
For more than two years, since f2c66cd8eeddedb440f33bc0f5cec1ed7ae376cb
"/proc/stat: scalability of irq num per cpu" the output of /proc/stat is
broken.
The first field in the "intr" line should contain the sum of all interrupts,
however since the above mentioned change it is always zero.The reason for that is that a per cpu irq sum variable had been introduced
which got incremented when calling kstat_incr_irqs_this_cpu(). However
on s390 we directly incremented only the per cpu per irq counter by accessing
the array element via kstat_cpu(smp_processor_id()).irqs[...].
So fix this and use the kstat_incr_irqs_this_cpu() wrapper which increments
both: the per cpu per irq counter and the per cpu irq sum counter.Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky
18 Dec, 2012
1 commit
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Add a driver for kvm guests that matches virtual ccw devices provided
by the host as virtio bridge devices.These virtio-ccw devices use a special set of channel commands in order
to perform virtio functions.Reviewed-by: Marcelo Tosatti
Reviewed-by: Alexander Graf
Signed-off-by: Cornelia Huck
Signed-off-by: Gleb Natapov
01 Dec, 2012
1 commit
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Support PCI adapter interrupts using the Single-IRQ-mode. Single-IRQ-mode
disables an adapter IRQ automatically after delivering it until the SIC
instruction enables it again. This is used to reduce the number of IRQs
for streaming workloads.Up to 64 MSI handlers can be registered per PCI function.
A hash table is used to map interrupt numbers to MSI descriptors.
The interrupt vector is scanned using the flogr instruction.
Only MSI/MSI-X interrupts are supported, no legacy INTs.Signed-off-by: Jan Glauber
Signed-off-by: Martin Schwidefsky
26 Sep, 2012
3 commits
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Use designated initializers for the irq class array in irq.c so
it's always guaranteed that the order of elements is equal to
their corresponding parts in irq.h.Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky -
Allow user-space threads to use runtime instrumentation (RI). To enable RI
for a thread there is a new s390 specific system call, sys_s390_runtime_instr,
that takes as parameter a realtime signal number. If the RI facility is
available the system call sets up a control block for the calling thread with
the appropriate permissions for the thread to modify the control block.The user-space thread can then use the store and modify RI instructions to
alter the control block and start/stop the instrumentation via RION/RIOFF.If the user specified program buffer runs full RI triggers an external
interrupt. The external interrupt is translated to a real-time signal that
is delivered to the thread that enabled RI on that CPU. The number of
the real-time signal is the number specified in the RI system call. So,
user-space can select any available real-time signal number in case the
application itself uses real-time signals for other purposes.The kernel saves the RI control blocks on task switch only if the running
thread was enabled for RI. Therefore, the performance impact on task switch
should be negligible if RI is not used.RI is only enabled for user-space mode and is disabled for the supervisor
state.Reviewed-by: Heiko Carstens
Signed-off-by: Jan Glauber
Signed-off-by: Martin Schwidefsky -
Add support for EADM interrupt statistics in /proc/interrupts.
Signed-off-by: Sebastian Ott
Signed-off-by: Martin Schwidefsky
20 Jul, 2012
1 commit
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Remove the file name from the comment at top of many files. In most
cases the file name was wrong anyway, so it's rather pointless.Also unify the IBM copyright statement. We did have a lot of sightly
different statements and wanted to change them one after another
whenever a file gets touched. However that never happened. Instead
people start to take the old/"wrong" statements to use as a template
for new files.
So unify all of them in one go.Signed-off-by: Heiko Carstens
23 May, 2012
1 commit
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CPU-measurement alerts are generated for different CPU-measurement
facilities, for example, the sampling and counter facilities.
Split the irq stats according to available facilities.Signed-off-by: Hendrik Brueckner
Signed-off-by: Martin Schwidefsky
11 Apr, 2012
1 commit
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Use braces for if/else/list_for_each_entry bodies if the body consists
of more than a single line. Otherwise I get confused and check if there
is something broken whenever I see these code snippets.Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky
23 Mar, 2012
2 commits
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Prepare the measurement facility which is currently only used by oprofile
for multiple users. To achieve that the measurement alert interrupt control
bit needs to be protected. The measurement alert definitions are moved
to a header file and an interrupt mask is added so that users can discard
interrupts if they are for a different measurement subsystem.Reviewed-by: Hendrik Brueckner
Signed-off-by: Jan Glauber
Signed-off-by: Martin Schwidefsky -
Pull s390 patches from Martin Schwidefsky:
"The biggest patch is the rework of the smp code, something I wanted to
do for some time. There are some patches for our various dump methods
and one new thing: z/VM LGR detection. LGR stands for linux-guest-
relocation and is the guest migration feature of z/VM. For debugging
purposes we keep a log of the systems where a specific guest has lived."Fix up trivial conflict in arch/s390/kernel/smp.c due to the scheduler
cleanup having removed some code next to removed s390 code.* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
[S390] kernel: Pass correct stack for smp_call_ipl_cpu()
[S390] Ensure that vmcore_info pointer is never accessed directly
[S390] dasd: prevent validate server for offline devices
[S390] Remove monolithic build option for zcrypt driver.
[S390] stack dump: fix indentation in output
[S390] kernel: Add OS info memory interface
[S390] Use block_sigmask()
[S390] kernel: Add z/VM LGR detection
[S390] irq: external interrupt code passing
[S390] irq: set __ARCH_IRQ_EXIT_IRQS_DISABLED
[S390] zfcpdump: Implement async sdias event processing
[S390] Use copy_to_absolute_zero() instead of "stura/sturg"
[S390] rework idle code
[S390] rework smp code
[S390] rename lowcore field
[S390] Fix gcc 4.6.0 compile warning
11 Mar, 2012
2 commits
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The external interrupt handlers have a parameter called ext_int_code.
Besides the name this paramter does not only contain the ext_int_code
but in addition also the "cpu address" (POP) which caused the external
interrupt.
To make the code a bit more obvious pass a struct instead so the called
function can easily distinguish between external interrupt code and
cpu address. The cpu address field however is named "subcode" since
some external interrupt sources do not pass a cpu address but a
different parameter (or none at all).Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky -
Whenever the cpu loads an enabled wait PSW it will appear as idle to the
underlying host system. The code in default_idle calls vtime_stop_cpu
which does the necessary voodoo to get the cpu time accounting right.
The udelay code just loads an enabled wait PSW. To correct this rework
the vtime_stop_cpu/vtime_start_cpu logic and move the difficult parts
to entry[64].S, vtime_stop_cpu can now be called from anywhere and
vtime_start_cpu is gone. The correction of the cpu time during wakeup
from an enabled wait PSW is done with a critical section in entry[64].S.
As vtime_start_cpu is gone, s390_idle_check can be removed as well.Signed-off-by: Martin Schwidefsky
22 Feb, 2012
1 commit
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The call_rcu() in unregister_external_interrupt() invokes
ext_int_hash_update(), which just does a kfree(). Convert the
call_rcu() to kfree_rcu(), allowing ext_int_hash_update() to
be eliminated.Signed-off-by: Paul E. McKenney
Signed-off-by: Paul E. McKenney
Cc: Martin Schwidefsky
Cc: Heiko Carstens
30 Oct, 2011
3 commits
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We use both the external call and emergency call IPIs to signal remote
cpus. Therefore it makes sense to account them differently withing
/proc/irqstats so we actually know what happened.Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky -
Add support for CHSC I/O interrupt statistics in /proc/interrupts.
Signed-off-by: Sebastian Ott
Signed-off-by: Martin Schwidefsky -
Current IRQ statistics support does not show detail counts for I/O
interrupts which are processed internally only. The result is a
summation count which is way off such as this one:CPU0 CPU1 CPU2
I/O: 1331 710 442
[...]
QAI: 15 16 16 [I/O] QDIO Adapter Interrupt
QDI: 1 0 0 [I/O] QDIO Interrupt
DAS: 706 645 381 [I/O] DASD
C15: 26 10 0 [I/O] 3215
C70: 0 0 0 [I/O] 3270
TAP: 0 0 0 [I/O] Tape
VMR: 0 0 0 [I/O] Unit Record Devices
LCS: 0 0 0 [I/O] LCS
CLW: 0 0 0 [I/O] CLAW
CTC: 0 0 0 [I/O] CTC
APB: 0 0 0 [I/O] AP BusFix this by moving I/O interrupt accounting into the common I/O layer.
Signed-off-by: Peter Oberparleiter
Signed-off-by: Martin Schwidefsky
24 Jul, 2011
1 commit
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The (un-)register_external_interrupt functions are not race safe if
more than one interrupt handler is added or deleted for an external
interrupt concurrently.Make the registration / unregistration of external interrupts race safe
by using RCU and a spinlock. RCU is used to avoid a performance penalty
in the external interrupt handler, the register and unregister functions
are protected by the spinlock and are not performance critical.
call_rcu must be used since the SCLP driver uses the interface with
IRQs disabled. Also use the generic list implementation rather than
homebrewn list code.Signed-off-by: Jan Glauber
Signed-off-by: Martin Schwidefsky
26 May, 2011
1 commit
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Merge irq.c and s390_ext.c into irq.c. That way all external interrupt
related functions are together.Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky
23 May, 2011
1 commit
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Count CPU measurement external interrupts as well.
Signed-off-by: Heiko Carstens
05 Jan, 2011
6 commits
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Add support for AP Bus I/O interrupt statistics in /proc/interrupts.
Signed-off-by: Holger Dengler
Signed-off-by: Felix Beck
Signed-off-by: Martin Schwidefsky -
Add support for CTC I/O interrupt statistics in /proc/interrupts.
Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky -
Add support for CLAW I/O interrupt statistics in /proc/interrupts.
Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky -
Add support for LCS I/O interrupt statistics in /proc/interrupts.
Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky -
Add support for VMUR I/O interrupt statistics in /proc/interrupts.
Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky -
Add support for ccw based tape I/O interrupt statistics in /proc/interrupts.
Signed-off-by: Heiko Carstens
Signed-off-by: Martin Schwidefsky
