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  1. 27 Dec, 2011 12 commits
    • Carsten Otte's avatar
      [S390] disable MACHINE_IS_VM check for pfault · f32269a0
      Carsten Otte authored 
      This patch disables the check for MACHINE_IS_VM when initializing the
pfault infrastructure. The code checks for successful completion of
diag 258 anyway, thus it's safe to try initialization on LPAR anyway.
This is needed to use pfault on kvm
Signed-off-by: default avatarCarsten Otte <cotte@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
      f32269a0
    • Heiko Carstens's avatar
      [S390] qdio: fix qdio_allocate_aob() declaration · 400d8291
      Heiko Carstens authored 
      drivers/s390/cio/qdio_setup.c:24:32:
  warning: non-ANSI function declaration of function 'qdio_allocate_aob'

While at it also simplify the function.
Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
      400d8291
    • Heiko Carstens's avatar
      [S390] topology: get rid of ifdefs · 83a24e32
      Heiko Carstens authored 
      Remove all ifdefs from topology code and also only compile it for the
CONFIG_SCHED_BOOK case. The new code selects SCHED_MC if SCHED_BOOK is
selected. SCHED_MC without SCHED_BOOK is not possible anymore.
Furthermore various sysfs attributes are not available anymore for the
!SCHED_BOOK case. In particular all attributes that correspond to
CPU polarization.
But since all real world kernels have SCHED_BOOK selected anyway this
doesn't matter too much.
Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
      83a24e32
    • Michael Holzheu's avatar
      [S390] kernel: Fix smp_switch_to_ipl_cpu() stack frame setup · 3931723f
      Michael Holzheu authored 
      Currently, when smp_switch_to_ipl_cpu() is done, the backchain in the dump
analysis tool crash looks like the following:

 #0 [1f746e70] __machine_kexec at 11dd92
 #1 [1f746eb8] smp_restart_cpu at 11820e
 #0 [00907eb0] cpu_idle at 10602e
 #1 [00907ef8] start_kernel at 979a08

It would be good to see the registers of the interrupted function.
To achieve this, the backchain on the new stack has to be set to zero.
This looks then like the following:

 #0 [1f746e70] __machine_kexec at 11dd8e
 #1 [1f746eb8] smp_restart_cpu at 11820a
 PSW:  0706000180000000 00000000005c6fe6 (vtime_stop_cpu+134)
 GPRS: 0000000000000000 00000000005c6fe6 0000000001ad0228 0000000001ad0248
       0000000000907f08 0000000001ad0b40 0000000000979344 0000000000000000
       00000000009c0000 00000000009c0010 00000000009ab024 0000000001ad0200
       0000000001ad0238 00000000005cc9d8 000000000010602e 0000000000907e68
 #0 [00907eb0] cpu_idle at 10602e
 #1 [00907ef8] start_kernel at 979a08

In addition to this, now also the correct PSW is stored in the pt_regs
structure that is located at the start of the panic stack.
Signed-off-by: default avatarMichael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
      3931723f
    • Martin Schwidefsky's avatar
      [S390] add support for physical memory > 4TB · 14045ebf
      Martin Schwidefsky authored 
      The kernel address space of a 64 bit kernel currently uses a three level
page table and the vmemmap array has a fixed address and a fixed maximum
size. A three level page table is good enough for systems with less than
3.8TB of memory, for bigger systems four page table levels need to be
used. Each page table level costs a bit of performance, use 3 levels for
normal systems and 4 levels only for the really big systems.
To avoid bloating sparse.o too much set MAX_PHYSMEM_BITS to 46 for a
maximum of 64TB of memory.
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
      14045ebf
    • Michael Holzheu's avatar
      [S390] Remove useless newline in reserve_kdump_bootmem() · 4999023a
      Michael Holzheu authored 
      Signed-off-by: default avatarMichael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
      4999023a
    • Michael Holzheu's avatar
      [S390] Rework create_mem_hole() function · 44e5ddc4
      Michael Holzheu authored 
      This patch makes the create_mem_hole() function more readable and
fixes some minor bugs (e.g. off-by-one problems).
Signed-off-by: default avatarMichael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
      44e5ddc4
    • Christian Borntraeger's avatar
      [S390] kvm: fix sleeping function ... at mm/page_alloc.c:2260 · c86cce2a
      Christian Borntraeger authored 
      commit cc772456
    [S390] fix list corruption in gmap reverse mapping

added a potential dead lock:

BUG: sleeping function called from invalid context at mm/page_alloc.c:2260
in_atomic(): 1, irqs_disabled(): 0, pid: 1108, name: qemu-system-s39
3 locks held by qemu-system-s39/1108:
 #0:  (&kvm->slots_lock){+.+.+.}, at: [<000003e004866542>] kvm_set_memory_region+0x3a/0x6c [kvm]
 #1:  (&mm->mmap_sem){++++++}, at: [<0000000000123790>] gmap_map_segment+0x9c/0x298
 #2:  (&(&mm->page_table_lock)->rlock){+.+.+.}, at: [<00000000001237a8>] gmap_map_segment+0xb4/0x298
CPU: 0 Not tainted 3.1.3 #45
Process qemu-system-s39 (pid: 1108, task: 00000004f8b3cb30, ksp: 00000004fd5978d0)
00000004fd5979a0 00000004fd597920 0000000000000002 0000000000000000
       00000004fd5979c0 00000004fd597938 00000004fd597938 0000000000617e96
       0000000000000000 00000004f8b3cf58 0000000000000000 0000000000000000
       000000000000000d 000000000000000c 00000004fd597988 0000000000000000
       0000000000000000 0000000000100a18 00000004fd597920 00000004fd597960
Call Trace:
([<0000000000100926>] show_trace+0xee/0x144)
 [<0000000000131f3a>] __might_sleep+0x12a/0x158
 [<0000000000217fb4>] __alloc_pages_nodemask+0x224/0xadc
 [<0000000000123086>] gmap_alloc_table+0x46/0x114
 [<000000000012395c>] gmap_map_segment+0x268/0x298
 [<000003e00486b014>] kvm_arch_commit_memory_region+0x44/0x6c [kvm]
 [<000003e004866414>] __kvm_set_memory_region+0x3b0/0x4a4 [kvm]
 [<000003e004866554>] kvm_set_memory_region+0x4c/0x6c [kvm]
 [<000003e004867c7a>] kvm_vm_ioctl+0x14a/0x314 [kvm]
 [<0000000000292100>] do_vfs_ioctl+0x94/0x588
 [<0000000000292688>] SyS_ioctl+0x94/0xac
 [<000000000061e124>] sysc_noemu+0x22/0x28
 [<000003fffcd5e7ca>] 0x3fffcd5e7ca
3 locks held by qemu-system-s39/1108:
 #0:  (&kvm->slots_lock){+.+.+.}, at: [<000003e004866542>] kvm_set_memory_region+0x3a/0x6c [kvm]
 #1:  (&mm->mmap_sem){++++++}, at: [<0000000000123790>] gmap_map_segment+0x9c/0x298
 #2:  (&(&mm->page_table_lock)->rlock){+.+.+.}, at: [<00000000001237a8>] gmap_map_segment+0xb4/0x298

Fix this by freeing the lock on the alloc path. This is ok, since the
gmap table is never freed until we call gmap_free, so the table we are
walking cannot go.
Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
      c86cce2a
    • Michael Holzheu's avatar
      [S390] Check for NULL termination in command line setup · 1fb81057
      Michael Holzheu authored 
      The current code in setup_boot_command_line() uses a heuristic to
detect an EBCDIC command line. It checks if any of the bytes in
the command line has bit one (0x80) set. In that case it is assumed
that we have an EBCDIC string and the complete command line is
converted.

On s390 there are cases where the boot loader provides a kernel
command line that is NULL terminated, but has random data after
the NULL termination. In that case, setup_boot_command_line()
might misinterpret an ASCII string for an EBCDIC string. A
subsequent string conversion can then damage the ASCII string.

This patch solves the problem by checking for NULL termination.
If no EBCDIC character has been found until the the NULL
termination has been found, we now assume that we have an ASCII
string.
Signed-off-by: default avatarMichael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
      1fb81057
    • Heiko Carstens's avatar
      [S390] irq: fix accounting of external call/emergency signal · 272f01bf
      Heiko Carstens authored 
      Mask the extint_code parameter of the smp external interrupt handler
to get the interruption code. Otherwise emergency call interrupts
erroneously might be accounted as emergency signal interrupts.
Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
      272f01bf
    • Keith Packard's avatar
      drm/i915: Disable RC6 on Sandybridge by default · 371de6e4
      Keith Packard authored 
      RC6 fails again.

> I found my system freeze mostly during starting up X and KDE. Sometimes it
> works for some minutes, sometimes it freezes immediatly. When the freeze
> happens, everything is dead (even the reset button does not work, I need to
> power cycle).

> I disabled RC6, and my system runs wonderfully.

> The system is a Z68 Pro board with Sandybridge i5-2500K processor, 8
> GB of RAM and UEFI firmware.
Reported-by: default avatarKai Krakow <hurikhan77@gmail.com>
Signed-off-by: default avatarKeith Packard <keithp@keithp.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      371de6e4
    • Keith Packard's avatar
      drm/i915: Disable semaphores by default on SNB · ebbd857e
      Keith Packard authored 
      Semaphores still cause problems on some machines:

> From Udo Steinberg:
>
> With Linux-3.2-rc6 I'm frequently seeing GPU hangs when large amounts of
> text scroll in an xterm, such as when extracting a tar archive. Such as this
> one (note the timestamps):
>
>  I can reproduce it fairly easily with something
>  as simple as:
>
>	  while true; do dmesg; done

This patch turns them off on SNB while leaving them on for IVB.
Reported-by: default avatarUdo Steinberg <udo@hypervisor.org>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Eugeni Dodonov <eugeni@dodonov.net>
Signed-off-by: default avatarKeith Packard <keithp@keithp.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      ebbd857e
  3. 26 Dec, 2011 8 commits
  5. 25 Dec, 2011 4 commits
  7. 24 Dec, 2011 4 commits
  9. 23 Dec, 2011 12 commits
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