1. 13 Apr, 2012 1 commit
    • David S. Miller's avatar
      sparc64: Fix bootup crash on sun4v. · 9e0daff3
      David S. Miller authored
      
      
      The DS driver registers as a subsys_initcall() but this can be too
      early, in particular this risks registering before we've had a chance
      to allocate and setup module_kset in kernel/params.c which is
      performed also as a subsyts_initcall().
      
      Register DS using device_initcall() insteal.
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      Cc: stable@vger.kernel.org
      9e0daff3
  2. 04 Apr, 2012 1 commit
  3. 30 Mar, 2012 1 commit
  4. 29 Mar, 2012 1 commit
  5. 28 Mar, 2012 3 commits
  6. 27 Mar, 2012 1 commit
  7. 21 Mar, 2012 1 commit
  8. 20 Mar, 2012 1 commit
    • Bjorn Helgaas's avatar
      sparc/PCI: convert devtree and arch-probed bus addresses to resource · a031589b
      Bjorn Helgaas authored
      Normal PCI enumeration via PCI config space uses __pci_read_base(), where
      the PCI core applies any bus-to-resource offset.  But sparc sometimes
      reads PCI config space itself, and sometimes it gets addresses from the
      device tree.
      
      In ac1edcc5
      
      , I converted sparc to use the PCI core bus-to-resource
      conversion, but I missed these sparc-specific paths.  I don't have a way
      to test it, but I think sparc is broken between that commit and this one.
      
      This patch replaces the sparc-specific pci_resource_adjust() with the
      generic pcibios_bus_to_resource() in the following paths:
      
          pci_cfg_fake_ranges()       (addresses read from PCI config)
          apb_fake_ranges()           (addresses computed based on PCI config)
          of_scan_pci_bridge()        (addresses from OF "ranges" property)
      
      N.B.: Resources of non-P2P bridge devices are set in pci_parse_of_addrs()
      and, as far as I can see, never converted to CPU addresses.  I do not
      understand why these would be treated differently than bridge windows.
      
      CC: "David S. Miller" <davem@davemloft.net>
      CC: sparclinux@vger.kernel.org
      Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
      Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
      a031589b
  9. 05 Mar, 2012 1 commit
  10. 01 Mar, 2012 2 commits
  11. 23 Feb, 2012 1 commit
    • Bjorn Helgaas's avatar
      sparc/PCI: get rid of device resource fixups · ac1edcc5
      Bjorn Helgaas authored
      
      
      Tell the PCI core about host bridge address translation so it can take
      care of bus-to-resource conversion for us.
      
      N.B. Leon apparently never uses initial BAR values, so it didn't matter
      that we never fixed up the I/O resources from bus address to CPU addresses.
      
      Other sparc uses pci_of_scan_bus(), which sets device resources directly
      to CPU addresses, not bus addresses, so it didn't need pcibios_fixup_bus()
      either.  But by telling the core about the offsets, we can nuke
      pcibios_resource_to_bus().
      
      CC: "David S. Miller" <davem@davemloft.net>
      CC: sparclinux@vger.kernel.org
      Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
      ac1edcc5
  12. 17 Jan, 2012 2 commits
    • Eric Paris's avatar
      audit: inline audit_syscall_entry to reduce burden on archs · b05d8447
      Eric Paris authored
      
      
      Every arch calls:
      
      if (unlikely(current->audit_context))
      	audit_syscall_entry()
      
      which requires knowledge about audit (the existance of audit_context) in
      the arch code.  Just do it all in static inline in audit.h so that arch's
      can remain blissfully ignorant.
      Signed-off-by: default avatarEric Paris <eparis@redhat.com>
      b05d8447
    • Eric Paris's avatar
      Audit: push audit success and retcode into arch ptrace.h · d7e7528b
      Eric Paris authored
      
      
      The audit system previously expected arches calling to audit_syscall_exit to
      supply as arguments if the syscall was a success and what the return code was.
      Audit also provides a helper AUDITSC_RESULT which was supposed to simplify things
      by converting from negative retcodes to an audit internal magic value stating
      success or failure.  This helper was wrong and could indicate that a valid
      pointer returned to userspace was a failed syscall.  The fix is to fix the
      layering foolishness.  We now pass audit_syscall_exit a struct pt_reg and it
      in turns calls back into arch code to collect the return value and to
      determine if the syscall was a success or failure.  We also define a generic
      is_syscall_success() macro which determines success/failure based on if the
      value is < -MAX_ERRNO.  This works for arches like x86 which do not use a
      separate mechanism to indicate syscall failure.
      
      We make both the is_syscall_success() and regs_return_value() static inlines
      instead of macros.  The reason is because the audit function must take a void*
      for the regs.  (uml calls theirs struct uml_pt_regs instead of just struct
      pt_regs so audit_syscall_exit can't take a struct pt_regs).  Since the audit
      function takes a void* we need to use static inlines to cast it back to the
      arch correct structure to dereference it.
      
      The other major change is that on some arches, like ia64, MIPS and ppc, we
      change regs_return_value() to give us the negative value on syscall failure.
      THE only other user of this macro, kretprobe_example.c, won't notice and it
      makes the value signed consistently for the audit functions across all archs.
      
      In arch/sh/kernel/ptrace_64.c I see that we were using regs[9] in the old
      audit code as the return value.  But the ptrace_64.h code defined the macro
      regs_return_value() as regs[3].  I have no idea which one is correct, but this
      patch now uses the regs_return_value() function, so it now uses regs[3].
      
      For powerpc we previously used regs->result but now use the
      regs_return_value() function which uses regs->gprs[3].  regs->gprs[3] is
      always positive so the regs_return_value(), much like ia64 makes it negative
      before calling the audit code when appropriate.
      Signed-off-by: default avatarEric Paris <eparis@redhat.com>
      Acked-by: H. Peter Anvin <hpa@zytor.com> [for x86 portion]
      Acked-by: Tony Luck <tony.luck@intel.com> [for ia64]
      Acked-by: Richard Weinberger <richard@nod.at> [for uml]
      Acked-by: David S. Miller <davem@davemloft.net> [for sparc]
      Acked-by: Ralf Baechle <ralf@linux-mips.org> [for mips]
      Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> [for ppc]
      d7e7528b
  13. 10 Jan, 2012 1 commit
  14. 06 Jan, 2012 3 commits
  15. 22 Dec, 2011 1 commit
    • David S. Miller's avatar
      sparc64: Fix MSIQ HV call ordering in pci_sun4v_msiq_build_irq(). · 7cc85833
      David S. Miller authored
      
      
      This silently was working for many years and stopped working on
      Niagara-T3 machines.
      
      We need to set the MSIQ to VALID before we can set it's state to IDLE.
      
      On Niagara-T3, setting the state to IDLE first was causing HV_EINVAL
      errors.  The hypervisor documentation says, rather ambiguously, that
      the MSIQ must be "initialized" before one can set the state.
      
      I previously understood this to mean merely that a successful setconf()
      operation has been performed on the MSIQ, which we have done at this
      point.  But it seems to also mean that it has been set VALID too.
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      7cc85833
  16. 21 Dec, 2011 1 commit
    • Kay Sievers's avatar
      cpu: convert 'cpu' and 'machinecheck' sysdev_class to a regular subsystem · 8a25a2fd
      Kay Sievers authored
      
      
      This moves the 'cpu sysdev_class' over to a regular 'cpu' subsystem
      and converts the devices to regular devices. The sysdev drivers are
      implemented as subsystem interfaces now.
      
      After all sysdev classes are ported to regular driver core entities, the
      sysdev implementation will be entirely removed from the kernel.
      
      Userspace relies on events and generic sysfs subsystem infrastructure
      from sysdev devices, which are made available with this conversion.
      
      Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
      Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no>
      Cc: Tony Luck <tony.luck@intel.com>
      Cc: Fenghua Yu <fenghua.yu@intel.com>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Chris Metcalf <cmetcalf@tilera.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Borislav Petkov <bp@amd64.org>
      Cc: Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
      Cc: Len Brown <lenb@kernel.org>
      Cc: Zhang Rui <rui.zhang@intel.com>
      Cc: Dave Jones <davej@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Russell King <rmk+kernel@arm.linux.org.uk>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Arjan van de Ven <arjan@linux.intel.com>
      Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
      Cc: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
      Signed-off-by: default avatarKay Sievers <kay.sievers@vrfy.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      8a25a2fd
  17. 11 Dec, 2011 4 commits
    • Frederic Weisbecker's avatar
      nohz: Remove tick_nohz_idle_enter_norcu() / tick_nohz_idle_exit_norcu() · 1268fbc7
      Frederic Weisbecker authored
      
      
      Those two APIs were provided to optimize the calls of
      tick_nohz_idle_enter() and rcu_idle_enter() into a single
      irq disabled section. This way no interrupt happening in-between would
      needlessly process any RCU job.
      
      Now we are talking about an optimization for which benefits
      have yet to be measured. Let's start simple and completely decouple
      idle rcu and dyntick idle logics to simplify.
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Reviewed-by: default avatarJosh Triplett <josh@joshtriplett.org>
      Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      1268fbc7
    • Paul E. McKenney's avatar
      sparc: Make SPARC use the new is_idle_task() API · 29f043a2
      Paul E. McKenney authored
      
      
      Change from direct comparison of ->pid with zero to is_idle_task().
      Signed-off-by: default avatarPaul E. McKenney <paul.mckenney@linaro.org>
      Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
      Reviewed-by: default avatarJosh Triplett <josh@joshtriplett.org>
      29f043a2
    • Frederic Weisbecker's avatar
      nohz: Allow rcu extended quiescent state handling seperately from tick stop · 2bbb6817
      Frederic Weisbecker authored
      
      
      It is assumed that rcu won't be used once we switch to tickless
      mode and until we restart the tick. However this is not always
      true, as in x86-64 where we dereference the idle notifiers after
      the tick is stopped.
      
      To prepare for fixing this, add two new APIs:
      tick_nohz_idle_enter_norcu() and tick_nohz_idle_exit_norcu().
      
      If no use of RCU is made in the idle loop between
      tick_nohz_enter_idle() and tick_nohz_exit_idle() calls, the arch
      must instead call the new *_norcu() version such that the arch doesn't
      need to call rcu_idle_enter() and rcu_idle_exit().
      
      Otherwise the arch must call tick_nohz_enter_idle() and
      tick_nohz_exit_idle() and also call explicitly:
      
      - rcu_idle_enter() after its last use of RCU before the CPU is put
      to sleep.
      - rcu_idle_exit() before the first use of RCU after the CPU is woken
      up.
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Mike Frysinger <vapier@gentoo.org>
      Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
      Cc: David Miller <davem@davemloft.net>
      Cc: Chris Metcalf <cmetcalf@tilera.com>
      Cc: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      2bbb6817
    • Frederic Weisbecker's avatar
      nohz: Separate out irq exit and idle loop dyntick logic · 280f0677
      Frederic Weisbecker authored
      
      
      The tick_nohz_stop_sched_tick() function, which tries to delay
      the next timer tick as long as possible, can be called from two
      places:
      
      - From the idle loop to start the dytick idle mode
      - From interrupt exit if we have interrupted the dyntick
      idle mode, so that we reprogram the next tick event in
      case the irq changed some internal state that requires this
      action.
      
      There are only few minor differences between both that
      are handled by that function, driven by the ts->inidle
      cpu variable and the inidle parameter. The whole guarantees
      that we only update the dyntick mode on irq exit if we actually
      interrupted the dyntick idle mode, and that we enter in RCU extended
      quiescent state from idle loop entry only.
      
      Split this function into:
      
      - tick_nohz_idle_enter(), which sets ts->inidle to 1, enters
      dynticks idle mode unconditionally if it can, and enters into RCU
      extended quiescent state.
      
      - tick_nohz_irq_exit() which only updates the dynticks idle mode
      when ts->inidle is set (ie: if tick_nohz_idle_enter() has been called).
      
      To maintain symmetry, tick_nohz_restart_sched_tick() has been renamed
      into tick_nohz_idle_exit().
      
      This simplifies the code and micro-optimize the irq exit path (no need
      for local_irq_save there). This also prepares for the split between
      dynticks and rcu extended quiescent state logics. We'll need this split to
      further fix illegal uses of RCU in extended quiescent states in the idle
      loop.
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Mike Frysinger <vapier@gentoo.org>
      Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
      Cc: David Miller <davem@davemloft.net>
      Cc: Chris Metcalf <cmetcalf@tilera.com>
      Cc: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      Reviewed-by: default avatarJosh Triplett <josh@joshtriplett.org>
      280f0677
  18. 04 Dec, 2011 1 commit
  19. 02 Dec, 2011 1 commit
  20. 27 Nov, 2011 1 commit
  21. 17 Nov, 2011 1 commit
  22. 15 Nov, 2011 1 commit
    • David S. Miller's avatar
      sparc: Stash orig_i0 into %g6 instead of %g2 · e88d2468
      David S. Miller authored
      
      
      As per the comments added by this commit, %g2 turns out to not be a
      usable place to save away orig_i0 for syscall restart handling.
      
      In fact all of %g2, %g3, %g4, and %g5 are assumed to be saved across
      a system call by various bits of code in glibc.
      
      %g1 can't be used because that holds the syscall number, which would
      need to be saved and restored for syscall restart handling too, and
      that would only compound our problems :-)
      
      This leaves us with %g6 and %g7 which are for "system use".  %g7 is
      used as the "thread register" by glibc, but %g6 is used as a compiler
      and assembler temporary scratch register.  And in no instance is %g6
      used to hold a value across a system call.
      
      Therefore %g6 is safe for storing away orig_i0, at least for now.
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e88d2468
  23. 14 Nov, 2011 1 commit
    • David S. Miller's avatar
      sparc: Fix handling of orig_i0 wrt. debugging when restarting syscalls. · 1d299bc7
      David S. Miller authored
      
      
      Although we provide a proper way for a debugger to control whether
      syscall restart occurs, we run into problems because orig_i0 is not
      saved and restored properly.
      
      Luckily we can solve this problem without having to make debuggers
      aware of the issue.  Across system calls, several registers are
      considered volatile and can be safely clobbered.
      
      Therefore we use the pt_regs save area of one of those registers, %g2,
      as a place to save and restore orig_i0.
      
      Debuggers transparently will do the right thing because they save and
      restore this register already.
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      1d299bc7
  24. 13 Nov, 2011 1 commit
  25. 01 Nov, 2011 1 commit
  26. 31 Oct, 2011 6 commits