1. 16 Dec, 2008 3 commits
    • Arnd Bergmann's avatar
      powerpc/cell/axon-msi: Fix MSI after kexec · 23e0e8af
      Arnd Bergmann authored
      Commit d015fe99
      
       'powerpc/cell/axon-msi: Retry on missing interrupt'
      has turned a rare failure to kexec on QS22 into a reproducible
      error, which we have now analysed.
      
      The problem is that after a kexec, the MSIC hardware still points
      into the middle of the old ring buffer.  We set up the ring buffer
      during reboot, but not the offset into it.  On older kernels, this
      would cause a storm of thousands of spurious interrupts after a
      kexec, which would most of the time get dropped silently.
      
      With the new code, we time out on each interrupt, waiting for
      it to become valid.  If more interrupts come in that we time
      out on, this goes on indefinitely, which eventually leads to
      a hard crash.
      
      The solution in this commit is to read the current offset from
      the MSIC when reinitializing it.  This now works correctly, as
      expected.
      Reported-by: default avatarDirk Herrendoerfer <d.herrendoerfer@de.ibm.com>
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Acked-by: default avatarMichael Ellerman <michael@ellerman.id.au>
      Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
      23e0e8af
    • Dave Hansen's avatar
      powerpc: Fix bootmem reservation on uninitialized node · a4c74ddd
      Dave Hansen authored
      careful_allocation() was calling into the bootmem allocator for
      nodes which had not been fully initialized and caused a previous
      bug:  http://patchwork.ozlabs.org/patch/10528/
      
        So, I merged a
      few broken out loops in do_init_bootmem() to fix it.  That changed
      the code ordering.
      
      I think this bug is triggered by having reserved areas for a node
      which are spanned by another node's contents.  In the
      mark_reserved_regions_for_nid() code, we attempt to reserve the
      area for a node before we have allocated the NODE_DATA() for that
      nid.  We do this since I reordered that loop.  I suck.
      
      This is causing crashes at bootup on some systems, as reported
      by Jon Tollefson.
      
      This may only present on some systems that have 16GB pages
      reserved.  But, it can probably happen on any system that is
      trying to reserve large swaths of memory that happen to span other
      nodes' contents.
      
      This commit ensures that we do not touch bootmem for any node which
      has not been initialized, and also removes a compile warning about
      an unused variable.
      Signed-off-by: default avatarDave Hansen <dave@linux.vnet.ibm.com>
      Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
      a4c74ddd
    • Brian King's avatar
      powerpc: Check for valid hugepage size in hugetlb_get_unmapped_area · 48f797de
      Brian King authored
      
      
      It looks like most of the hugetlb code is doing the correct thing if
      hugepages are not supported, but the mmap code is not.  If we get into
      the mmap code when hugepages are not supported, such as in an LPAR
      which is running Active Memory Sharing, we can oops the kernel.  This
      fixes the oops being seen in this path.
      
      oops: Kernel access of bad area, sig: 11 [#1]
      SMP NR_CPUS=1024 NUMA pSeries
      Modules linked in: nfs(N) lockd(N) nfs_acl(N) sunrpc(N) ipv6(N) fuse(N) loop(N)
      dm_mod(N) sg(N) ibmveth(N) sd_mod(N) crc_t10dif(N) ibmvscsic(N)
      scsi_transport_srp(N) scsi_tgt(N) scsi_mod(N)
      Supported: No
      NIP: c000000000038d60 LR: c00000000003945c CTR: c0000000000393f0
      REGS: c000000077e7b830 TRAP: 0300   Tainted: G
      (2.6.27.5-bz50170-2-ppc64)
      MSR: 8000000000009032 <EE,ME,IR,DR>  CR: 44000448  XER: 20000001
      DAR: c000002000af90a8, DSISR: 0000000040000000
      TASK = c00000007c1b8600[4019] 'hugemmap01' THREAD: c000000077e78000 CPU: 6
      GPR00: 0000001fffffffe0 c000000077e7bab0 c0000000009a4e78 0000000000000000
      GPR04: 0000000000010000 0000000000000001 00000000ffffffff 0000000000000001
      GPR08: 0000000000000000 c000000000af90c8 0000000000000001 0000000000000000
      GPR12: 000000000000003f c000000000a73880 0000000000000000 0000000000000000
      GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000010000
      GPR20: 0000000000000000 0000000000000003 0000000000010000 0000000000000001
      GPR24: 0000000000000003 0000000000000000 0000000000000001 ffffffffffffffb5
      GPR28: c000000077ca2e80 0000000000000000 c00000000092af78 0000000000010000
      NIP [c000000000038d60] .slice_get_unmapped_area+0x6c/0x4e0
      LR [c00000000003945c] .hugetlb_get_unmapped_area+0x6c/0x80
      Call Trace:
      [c000000077e7bbc0] [c00000000003945c] .hugetlb_get_unmapped_area+0x6c/0x80
      [c000000077e7bc30] [c000000000107e30] .get_unmapped_area+0x64/0xd8
      [c000000077e7bcb0] [c00000000010b140] .do_mmap_pgoff+0x140/0x420
      [c000000077e7bd80] [c00000000000bf5c] .sys_mmap+0xc4/0x140
      [c000000077e7be30] [c0000000000086b4] syscall_exit+0x0/0x40
      Instruction dump:
      fac1ffb0 fae1ffb8 fb01ffc0 fb21ffc8 fb41ffd0 fb61ffd8 fb81ffe0 fbc1fff0
      fbe1fff8 f821fef1 f8c10158 f8e10160 <7d49002e> f9010168 e92d01b0 eb4902b0
      Signed-off-by: default avatarBrian King <brking@linux.vnet.ibm.com>
      Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
      48f797de
  2. 15 Dec, 2008 3 commits
  3. 13 Dec, 2008 7 commits
  4. 12 Dec, 2008 5 commits
  5. 11 Dec, 2008 4 commits
  6. 10 Dec, 2008 18 commits