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649 commits

Author SHA1 Message Date
Pavel Emelianov
bcdcd8e725 Report that kernel is tainted if there was an OOPS
If the kernel OOPSed or BUGed then it probably should be considered as
tainted.  Thus, all subsequent OOPSes and SysRq dumps will report the
tainted kernel.  This saves a lot of time explaining oddities in the
calltraces.

Signed-off-by: Pavel Emelianov <xemul@openvz.org>
Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
[ Added parisc patch from Matthew Wilson  -Linus ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-17 10:23:02 -07:00
David S. Miller
778feeb475 [SPARC64]: Fix race between MD update and dr-cpu add.
We need to make sure the MD update occurs before we try to
process dr-cpu configure requests.  MD update and dr-cpu
were being processed by seperate threads so that did not
happen occaisionally.

Fix this by executing all domain services data packets from
a single thread, in order.

This will help simplify some other things as well.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 17:11:59 -07:00
Fabio Massimo Di Nitto
3ac66e33ea [SPARC64]: SMP build fix.
The UP build fix had some unintended consequences.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 17:11:58 -07:00
David S. Miller
d54bc2793e [SPARC64]: Fix UP build.
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 04:41:51 -07:00
David S. Miller
e0204409df [SPARC64]: dr-cpu unconfigure support.
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 04:05:32 -07:00
David S. Miller
9918cc2e32 [SPARC64]: Give more accurate errors in dr_cpu_configure().
When cpu_up() fails, we can discern the most likely cause.

If cpu_present() is false, this means the cpu did not appear
in the MD.  If -ENODEV is the error return value, then
the processor did not boot properly into the kernel.

Pass this information back in the dr-cpu response packet.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 04:05:24 -07:00
David S. Miller
39dd992aee [SPARC64]: Clear cpu_{core,sibling}_map[] in smp_fill_in_sib_core_maps()
When we hot-plug in new cpus, the core_id and proc_id of existing
cpus can change.  So in order to set the cpu groups correctly we
need to clear the maps out completely first.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 04:05:19 -07:00
David S. Miller
b37d40d175 [SPARC64]: Fix leak when DR added cpu does not bootup.
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 04:05:15 -07:00
David S. Miller
b53bcb6799 [SPARC64]: Add ->set_affinity IRQ handlers.
dr-cpu unconfigure requests will walk throught he enabled
IRQs and trigger ->set_affinity so that the going-down
cpu no longer has INOs targetted to it.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 04:05:11 -07:00
David S. Miller
bd0e11ff22 [SPARC64]: Process dr-cpu events in a kthread instead of workqueue.
This will be necessary to handle unconfigure requests
properly.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 04:05:07 -07:00
David S. Miller
8b99cfb8cc [SPARC64]: More sensible udelay implementation.
Take a page from the powerpc folks and just calculate the
delay factor directly.

Since frequency scaling chips use a system-tick register,
the value is going to be the same system-wide.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 04:05:02 -07:00
David S. Miller
27a2ef382c [SPARC64]: SMP build fixes.
With the move of ldom_startcpu_cpuid() into smp.c some other
things need to follow along:

1) smp.c is not a driver so we can't use "PFX" macro in the
   printk calls.

2) smp.c now needs asm/io.h and asm/hvtramp.h, ds.c no longer
   does

3) kimage_addr_to_ra() also needs to move into smp.c

While we're here, update copyright info and my email address
in smp.c

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 04:04:58 -07:00
David S. Miller
8f3fff2050 [SPARC64]: mdesc.c needs linux/mm.h
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 04:04:53 -07:00
David S. Miller
b14f5c100c [SPARC64]: Fix build regressions added by dr-cpu changes.
Do not select HOTPLUG_CPU from SUN_LDOMS, that causes
HOTPLUG_CPU to be selected even on non-SMP which is
illegal.

Only build hvtramp.o when SMP, just like trampoline.o

Protect dr-cpu code in ds.c with HOTPLUG_CPU.

Likewise move ldom_startcpu_cpuid() to smp.c and protect
it and the call site with SUN_LDOMS && HOTPLUG_CPU.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 04:04:49 -07:00
David S. Miller
f8be339c02 [SPARC64]: Unconditionally register vio_bus_type.
The VIO drivers register themselves unconditionally just
like those of any other bus type, so to avoid crashes
on non-VIO systems we need to always register vio_bus_type.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 04:04:45 -07:00
David S. Miller
4f0234f4f9 [SPARC64]: Initial LDOM cpu hotplug support.
Only adding cpus is supports at the moment, removal
will come next.

When new cpus are configured, the machine description is
updated.  When we get the configure request we pass in a
cpu mask of to-be-added cpus to the mdesc CPU node parser
so it only fetches information for those cpus.  That code
also proceeds to update the SMT/multi-core scheduling bitmaps.

cpu_up() does all the work and we return the status back
over the DS channel.

CPUs via dr-cpu need to be booted straight out of the
hypervisor, and this requires:

1) A new trampoline mechanism.  CPUs are booted straight
   out of the hypervisor with MMU disabled and running in
   physical addresses with no mappings installed in the TLB.

   The new hvtramp.S code sets up the critical cpu state,
   installs the locked TLB mappings for the kernel, and
   turns the MMU on.  It then proceeds to follow the logic
   of the existing trampoline.S SMP cpu bringup code.

2) All calls into OBP have to be disallowed when domaining
   is enabled.  Since cpus boot straight into the kernel from
   the hypervisor, OBP has no state about that cpu and therefore
   cannot handle being invoked on that cpu.

   Luckily it's only a handful of interfaces which can be called
   after the OBP device tree is obtained.  For example, rebooting,
   halting, powering-off, and setting options node variables.

CPU removal support will require some infrastructure changes
here.  Namely we'll have to process the requests via a true
kernel thread instead of in a workqueue.  workqueues run on
a per-cpu thread, but when unconfiguring we might need to
force the thread to execute on another cpu if the current cpu
is the one being removed.  Removal of a cpu also causes the kernel
to destroy that cpu's workqueue running thread.

Another issue on removal is that we may have interrupts still
pointing to the cpu-to-be-removed.  So new code will be needed
to walk the active INO list and retarget those cpus as-needed.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 04:04:40 -07:00
David S. Miller
b3e13fbeb9 [SPARC64]: Fix setting of variables in LDOM guest.
There is a special domain services capability for setting
variables in the OBP options node.  Guests don't have permanent
store for the OBP variables like a normal system, so they are
instead maintained in the LDOM control node or in the SC.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 04:04:36 -07:00
David S. Miller
83292e0a9c [SPARC64]: Fix MD property lifetime bugs.
Property values cannot be referenced outside of
mdesc_grab()/mdesc_release() pairs.  The only major
offender was the VIO bus layer, easily fixed.

Add some commentary to mdesc.h describing these rules.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 04:04:33 -07:00
David S. Miller
43fdf27470 [SPARC64]: Abstract out mdesc accesses for better MD update handling.
Since we have to be able to handle MD updates, having an in-tree
set of data structures representing the MD objects actually makes
things more painful.

The MD itself is easy to parse, and we can implement the existing
interfaces using direct parsing of the MD binary image.

The MD is now reference counted, so accesses have to now take the
form:

	handle = mdesc_grab();

	... operations on MD ...

	mdesc_release(handle);

The only remaining issue are cases where code holds on to references
to MD property values.  mdesc_get_property() returns a direct pointer
to the property value, most cases just pull in the information they
need and discard the pointer, but there are few that use the pointer
directly over a long lifetime.  Those will be fixed up in a subsequent
changeset.

A preliminary handler for MD update events from domain services is
there, it is rudimentry but it works and handles all of the reference
counting.  It does not check the generation number of the MDs,
and it does not generate a "add/delete" list for notification to
interesting parties about MD changes but that will be forthcoming.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 04:04:28 -07:00
David S. Miller
133f09a169 [SPARC64]: Use more mearningful names for IRQ registry.
All of the interrupts say "LDX RX" and "LDX TX" currently
which is next to useless.  Put a device specific prefix
before "RX" and "TX" instead which makes it much more
useful.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 04:04:24 -07:00
David S. Miller
e450992d13 [SPARC64]: Initial domain-services driver.
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 04:04:20 -07:00
David S. Miller
13077d8028 [SPARC64]: Export powerd facilities for external entities.
Besides the existing usage for power-button interrupts, we'll
want to make use of this code for domain-services where the
LDOM manager can send reboot requests to the guest node.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 04:04:16 -07:00
David S. Miller
2c4f4ecb7a [SPARC64]: Add domain-services nodes to VIO device tree.
They sit under the root of the MD tree unlike the rest of
the LDC channel based virtual devices.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 04:04:13 -07:00
David S. Miller
cb48123584 [SPARC64]: Assorted LDC bug cures.
1) LDC_MODE_RELIABLE is deprecated an unused by anything, plus
   it and LDC_MODE_STREAM were mis-numbered.

2) read_stream() should try to read as much as possible into
   the per-LDC stream buffer area, so do not trim the read_nonraw()
   length by the caller's size parameter.

3) Send data ACKs when necessary in read_nonraw().

4) In read_nonraw() when we get a pure ACK, advance the RX head
   unconditionally past it.

5) Provide the ACKID field in the ldcdgb() packet dump in read_nonraw().
   This helps debugging stream mode LDC channel problems.

6) Decrease verbosity of rx_data_wait() so that it is more useful.
   A debugging message each loop iteration is too much.

7) In process_data_ack() stop the loop checking when we hit lp->tx_tail
   not lp->tx_head.

8) Set the seqid field properly in send_data_nack().

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 04:04:09 -07:00
David S. Miller
5a606b72a4 [SPARC64]: Do not ACK an INO if it is disabled or inprogress.
This is also a partial workaround for a bug in the LDOM firmware which
double-transmits RX inos during high load.  Without this, such an
event causes the kernel to loop forever in the interrupt call chain
ACK'ing but never actually running the IRQ handler (and thus clearing
the interrupt condition in the device).

There is still a bad potential effect when double INOs occur,
not covered by this changeset.  Namely, if the INO is already on
the per-cpu INO vector list, we still blindly re-insert it and
thus we can end up losing interrupts already linked in after
it.

We could deal with that by traversing the list before insertion,
but that's too expensive for this edge case.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 04:04:05 -07:00
David S. Miller
e53e97ce3c [SPARC64]: Add LDOM virtual channel driver and VIO device layer.
Virtual devices on Sun Logical Domains are built on top
of a virtual channel framework.  This, with help of hypervisor
interfaces, provides a link layer protocol with basic
handshaking over which virtual device clients and servers
communicate.

Built on top of this is a VIO device protocol which has it's
own handshaking and message types.  At this layer attributes
are exchanged (disk size, network device addresses, etc.)
descriptor rings are registered, and data transfers are
triggers and replied to.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-16 04:03:18 -07:00
Auke Kok
b8a3a5214d PCI: read revision ID by default
Currently there are 97 occurrences where drivers need the pci
revision ID. We can do this once for all devices. Even the pci
subsystem needs the revision several times for quirks. The extra
u8 member pads out nicely in the pci_dev struct.

Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-07-11 16:02:09 -07:00
Ingo Molnar
0437e109e1 sched: zap the migration init / cache-hot balancing code
the SMP load-balancer uses the boot-time migration-cost estimation
code to attempt to improve the quality of balancing. The reason for
this code is that the discrete priority queues do not preserve
the order of scheduling accurately, so the load-balancer skips
tasks that were running on a CPU 'recently'.

this code is fundamental fragile: the boot-time migration cost detector
doesnt really work on systems that had large L3 caches, it caused boot
delays on large systems and the whole cache-hot concept made the
balancing code pretty undeterministic as well.

(and hey, i wrote most of it, so i can say it out loud that it sucks ;-)

under CFS the same purpose of cache affinity can be achieved without
any special cache-hot special-case: tasks are sorted in the 'timeline'
tree and the SMP balancer picks tasks from the left side of the
tree, thus the most cache-cold task is balanced automatically.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-07-09 18:51:57 +02:00
David S. Miller
a357b8f42e [SPARC64]: Need to set state to IDLE during sun4v IRQ enable.
This fixes hypervisor console interrupts on LDOM guests.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-06-26 00:13:31 -07:00
David S. Miller
1245088400 [SPARC64]: Fix VIRQ enabling.
We were doing the wrong call to turn them on, and also
when enabling we need to forcefully set the state to IDLE.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-06-26 00:13:09 -07:00
David S. Miller
fc395f8d58 [SPARC64]: Fix args to sun4v_ldc_revoke().
First argument is LDC channel ID, then mapping cookie,
then the MTE revoke cookie.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-06-13 00:01:27 -07:00
David S. Miller
56f5c0bd50 [SPARC64]: Fix IO/MEM space sizing for PCI.
In pci_determine_mem_io_space(), do not hard code the region sizes.
Instead, use the values given to us in the ranges property.

Thanks goes to Mikael Petterson for the original Xorg failure
bug repoert, and strace dumps from Mikael and Dmitry Artamonow.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-06-13 00:01:19 -07:00
David S. Miller
4a907dec98 [SPARC64]: Wire up cookie based sun4v interrupt registry.
This will be used for logical domain channel interrupts.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-06-13 00:01:04 -07:00
David S. Miller
8c2786cfa6 [SPARC64]: Handle PCI bridges without 'ranges' property.
This fixes the IDE controller not showing up on Netra-T1
systems.

Just like Simba bridges, some PCI bridges can lack the
'ranges' OBP property.  So we handle this similarly to
the existing Simba code:

1) In of_device register address resolving, we push the
   translation to the parent.

2) In PCI device scanning, we interrogate the PCI config
   space registers of the PCI bus device in order to resolve
   the resources, just like the generic Linux PCI probing
   code does.

With much help and testing from Fabio, who also reported
the initial problem.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Fabio Massimo Di Nitto <fabbione@ubuntu.com>
2007-06-07 21:59:44 -07:00
Robert P. J. Day
ea1ff19ce0 [SPARC64]: Include <linux/rwsem.h> instead of <asm/rwsem.h>.
To be consistent with other architectures, include the generic version
of rwsem.h.

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-06-07 20:24:50 -07:00
David S. Miller
ec4d18f219 [SPARC64]: Fix SBUS IRQ regression caused by PCI-E driver.
We used to access the 64-bit IRQ IMAP and ICLR registers of bus
controllers 4-bytes in and as a 32-bit register word, since only the
low 32-bits were relevant.  This seemed like a good idea at the time.

But the PCI-E controller requires full 8-byte 64-bit access to
these registers, so we switched over to accessing them fully.

SBUS was not adjusted properly, which broke interrupts completely.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-06-07 16:59:51 -07:00
David S. Miller
321566c250 [SPARC64]: Fix 2 bugs in PCI Sabre bus scanning.
If we are on hummingbird, bus runs at 66MHZ.

pbm->pci_bus should be setup with the result of pci_scan_one_pbm()
or else we deref NULL pointers in the error interrupt handlers.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-06-07 16:59:46 -07:00
David S. Miller
a2f9f6bbb3 [SPARC64]: Fix {mc,smt}_capable().
It's not just sun4v hypervisor platforms that should return true
for this, sun4u with UltraSPARC-IV should return true too.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-06-04 21:50:05 -07:00
David S. Miller
5cd342df96 [SPARC64]: Make core and sibling groups equal on UltraSPARC-IV.
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-06-04 21:50:02 -07:00
David S. Miller
f78eae2e6f [SPARC64]: Proper multi-core scheduling support.
The scheduling domain hierarchy is:

   all cpus -->
      cpus that share an instruction cache -->
          cpus that share an integer execution unit

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-06-04 21:50:00 -07:00
David Miller
d887ab3a9b [SPARC64]: Provide mmu statistics via sysfs.
If the system supports hypervisor based statistics, allow them to
be fetched, enabled, and disabled via sysfs.

Enable and disable via the boolean:

/sys/devices/systems/cpu/cpuN/mmustat_enable

Statistic values are provided under:

/sys/devices/systems/cpu/cpuN/mmu_status/

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-06-04 21:49:57 -07:00
David Miller
48b6735640 [SPARC64]: Fix service channel hypervisor function names.
sed 's/scv/svc/'

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-06-04 21:49:54 -07:00
David S. Miller
d1f253e60a [SPARC64]: Export basic cpu properties via sysfs.
Cache sizes, udelay_val, and clock_tick.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-06-04 21:49:51 -07:00
David S. Miller
eff3414b72 [SPARC64]: Move topology init code into new file, sysfs.c
Also, use per-cpu data for struct cpu.  Calling kmalloc for
each cpu in topology_init() is just plain clumsy.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-06-04 21:49:50 -07:00
Linus Torvalds
54ca412336 Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild-fix
* git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild-fix:
  sparc64: fix alignment bug in linker definition script
2007-05-31 12:33:16 -07:00
David S. Miller
dbbe3cb8cf [SPARC64]: Add missing NCS and SVC hypervisor interfaces.
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-05-31 01:52:48 -07:00
Sam Ravnborg
4096b46f01 sparc64: fix alignment bug in linker definition script
The RO_DATA section were hardcoded to a specific
alignment in include/asm-generic/vmlinux.h.
But for sparc64 this did not match the PAGE_SIZE.

Introduce a new section definition named:
RO_DATA that takes actual alignment as parameter.
RODATA are provided for backward compatibility.

On top of this avoid hardcoding alignment for
sparc64 in reset of the script
Fix is build-tested on sparc64 + x86_64.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
2007-05-29 21:29:00 +02:00
David S. Miller
7db35f31cb [SPARC64]: Fill holes in hypervisor APIs and fix KTSB registry.
Several interfaces were missing and others misnumbered or
improperly documented.

Also, make sure to check the return value when registering
the kernel TSBs with the hypervisor.  This helped to find
the 4MB kernel TSB alignment bug fixed in a previous changeset.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-05-29 02:52:15 -07:00
David S. Miller
2d9e2763c2 [SPARC64]: Fix two bugs wrt. kernel 4MB TSB.
1) The TSB lookup was not using the correct hash mask.

2) It was not aligned on a boundary equal to it's size,
   which is required by the sun4v Hypervisor.

wasn't having it's return value checked, and that bug will be fixed up
as well in a subsequent changeset.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-05-29 02:51:38 -07:00
David S. Miller
679292993c [SPARC64]: Fix _PAGE_EXEC_4U check in sun4u I-TLB miss handler.
It was using an immediate _PAGE_EXEC_4U value in an 'and'
instruction to perform the test.  This doesn't work because
the immediate field is signed 13-bit, this the mask being
tested against the PTE was 0x1000 sign-extended to 32-bits
instead of just plain 0x1000.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-05-29 02:50:15 -07:00