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  1. 19 6月, 2013 6 次提交
  3. 15 6月, 2013 3 次提交
    • B
      powerpc: Fix missing/delayed calls to irq_work · 230b3034
      由 Benjamin Herrenschmidt 提交于 
      When replaying interrupts (as a result of the interrupt occurring
while soft-disabled), in the case of the decrementer, we are exclusively
testing for a pending timer target. However we also use decrementer
interrupts to trigger the new "irq_work", which in this case would
be missed.

This change the logic to force a replay in both cases of a timer
boundary reached and a decrementer interrupt having actually occurred
while disabled. The former test is still useful to catch cases where
a CPU having been hard-disabled for a long time completely misses the
interrupt due to a decrementer rollover.

CC: <stable@vger.kernel.org> [v3.4+]
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Tested-by: NSteven Rostedt <rostedt@goodmis.org>
      230b3034
    • P
      powerpc: Fix emulation of illegal instructions on PowerNV platform · bf593907
      由 Paul Mackerras 提交于 
      Normally, the kernel emulates a few instructions that are unimplemented
on some processors (e.g. the old dcba instruction), or privileged (e.g.
mfpvr).  The emulation of unimplemented instructions is currently not
working on the PowerNV platform.  The reason is that on these machines,
unimplemented and illegal instructions cause a hypervisor emulation
assist interrupt, rather than a program interrupt as on older CPUs.
Our vector for the emulation assist interrupt just calls
program_check_exception() directly, without setting the bit in SRR1
that indicates an illegal instruction interrupt.  This fixes it by
making the emulation assist interrupt set that bit before calling
program_check_interrupt().  With this, old programs that use no-longer
implemented instructions such as dcba now work again.

CC: <stable@vger.kernel.org>
Signed-off-by: NPaul Mackerras <paulus@samba.org>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
      bf593907
    • M
      powerpc: Fix stack overflow crash in resume_kernel when ftracing · 0e37739b
      由 Michael Ellerman 提交于 
      It's possible for us to crash when running with ftrace enabled, eg:

  Bad kernel stack pointer bffffd12 at c00000000000a454
  cpu 0x3: Vector: 300 (Data Access) at [c00000000ffe3d40]
      pc: c00000000000a454: resume_kernel+0x34/0x60
      lr: c00000000000335c: performance_monitor_common+0x15c/0x180
      sp: bffffd12
     msr: 8000000000001032
     dar: bffffd12
   dsisr: 42000000

If we look at current's stack (paca->__current->stack) we see it is
equal to c0000002ecab0000. Our stack is 16K, and comparing to
paca->kstack (c0000002ecab3e30) we can see that we have overflowed our
kernel stack. This leads to us writing over our struct thread_info, and
in this case we have corrupted thread_info->flags and set
_TIF_EMULATE_STACK_STORE.

Dumping the stack we see:

  3:mon> t c0000002ecab0000
  [c0000002ecab0000] c00000000002131c .performance_monitor_exception+0x5c/0x70
  [c0000002ecab0080] c00000000000335c performance_monitor_common+0x15c/0x180
  --- Exception: f01 (Performance Monitor) at c0000000000fb2ec .trace_hardirqs_off+0x1c/0x30
  [c0000002ecab0370] c00000000016fdb0 .trace_graph_entry+0xb0/0x280 (unreliable)
  [c0000002ecab0410] c00000000003d038 .prepare_ftrace_return+0x98/0x130
  [c0000002ecab04b0] c00000000000a920 .ftrace_graph_caller+0x14/0x28
  [c0000002ecab0520] c0000000000d6b58 .idle_cpu+0x18/0x90
  [c0000002ecab05a0] c00000000000a934 .return_to_handler+0x0/0x34
  [c0000002ecab0620] c00000000001e660 .timer_interrupt+0x160/0x300
  [c0000002ecab06d0] c0000000000025dc decrementer_common+0x15c/0x180
  --- Exception: 901 (Decrementer) at c0000000000104d4 .arch_local_irq_restore+0x74/0xa0
  [c0000002ecab09c0] c0000000000fe044 .trace_hardirqs_on+0x14/0x30 (unreliable)
  [c0000002ecab0fb0] c00000000016fe3c .trace_graph_entry+0x13c/0x280
  [c0000002ecab1050] c00000000003d038 .prepare_ftrace_return+0x98/0x130
  [c0000002ecab10f0] c00000000000a920 .ftrace_graph_caller+0x14/0x28
  [c0000002ecab1160] c0000000000161f0 .__ppc64_runlatch_on+0x10/0x40
  [c0000002ecab11d0] c00000000000a934 .return_to_handler+0x0/0x34
  --- Exception: 901 (Decrementer) at c0000000000104d4 .arch_local_irq_restore+0x74/0xa0

  ... and so on

__ppc64_runlatch_on() is called from RUNLATCH_ON in the exception entry
path. At that point the irq state is not consistent, ie. interrupts are
hard disabled (by the exception entry), but the paca soft-enabled flag
may be out of sync.

This leads to the local_irq_restore() in trace_graph_entry() actually
enabling interrupts, which we do not want. Because we have not yet
reprogrammed the decrementer we immediately take another decrementer
exception, and recurse.

The fix is twofold. Firstly make sure we call DISABLE_INTS before
calling RUNLATCH_ON. The badly named DISABLE_INTS actually reconciles
the irq state in the paca with the hardware, making it safe again to
call local_irq_save/restore().

Although that should be sufficient to fix the bug, we also mark the
runlatch routines as notrace. They are called very early in the
exception entry and we are asking for trouble tracing them. They are
also fairly uninteresting and tracing them just adds unnecessary
overhead.

[ This regression was introduced by fe1952fc
  "powerpc: Rework runlatch code" by myself --BenH
]

CC: <stable@vger.kernel.org> [v3.4+]
Signed-off-by: NMichael Ellerman <michael@ellerman.id.au>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
      0e37739b
  5. 14 6月, 2013 1 次提交
  7. 13 6月, 2013 2 次提交
  9. 11 6月, 2013 10 次提交
  11. 10 6月, 2013 10 次提交
  13. 08 6月, 2013 2 次提交
    • D
      ARM: exynos: add debug_ll_io_init() call in exynos_init_io() · 9c1fcdcc
      由 Doug Anderson 提交于 
      If the early MMU mapping of the UART happens to get booted out of the
TLB between the start of paging_init() and when we finally re-add the
UART at the very end of s3c_init_cpu(), we'll get a hang at bootup if
we've got early_printk enabled.  Avoid this hang by calling
debug_ll_io_init() early.

Without this patch, you can reliably reproduce a hang when early
printk is enabled by adding flush_tlb_all() at the start of
exynos_init_io().  After this patch the hang goes away.
Signed-off-by: NDoug Anderson <dianders@chromium.org>
Acked-by: NKukjin Kim <kgene.kim@samsung.com>
Signed-off-by: NOlof Johansson <olof@lixom.net>
      9c1fcdcc
    • T
      ARM: EXYNOS: uncompress - print debug messages if DEBUG_LL is defined · 437d8ac5
      由 Tushar Behera 提交于 
      Printing low-level debug messages make an assumption that the specified
UART port has been preconfigured by the bootloader. Incorrectly
specified UART port results in system getting stalled while printing the
message "Uncompressing Linux... done, booting the kernel"
This UART port number is specified through S3C_LOWLEVEL_UART_PORT. Since
the UART port might different for different board, it is not possible to
specify it correctly for every board that use a common defconfig file.

Calling this print subroutine only when DEBUG_LL fixes the problem. By
disabling DEBUG_LL in default config file, we would be able to boot
multiple boards with different default UART ports.

With this current approach, we miss the print "Uncompressing Linux...
done, booting the kernel." when DEBUG_LL is not defined.
Signed-off-by: NTushar Behera <tushar.behera@linaro.org>
Signed-off-by: NOlof Johansson <olof@lixom.net>
      437d8ac5
  15. 07 6月, 2013 2 次提交
  17. 06 6月, 2013 4 次提交
    • J
      ARM: omap3: clock: fix wrong container_of in clock36xx.c · a93d8a1c
      由 Jean-Philippe Francois 提交于 
      omap36xx_pwrdn_clk_enable_with_hsdiv_restore expects the parent hw of
the clock to be a clk_hw_omap. However, looking at cclock3xxx_data.c,
all concerned clock have parent defined as clk_divider.  Fix the
function to use clk_divider.  Tested with 3.9 on dm3730.
Signed-off-by: NJean-Philippe François <jp.francois@cynove.com>
Cc: NeilBrown <neilb@suse.de>
Cc: Mike Turquette <mturquette@linaro.org>
Signed-off-by: NPaul Walmsley <paul@pwsan.com>
      a93d8a1c
    • J
      MIPS: ralink: add missing SZ_1M multiplier · cdfce539
      由 John Crispin 提交于 
      On RT5350 the memory size is set to Bytes and not MegaBytes due to a missing
multiplier.
Signed-off-by: NJohn Crispin <blogic@openwrt.org>
Cc: John Crispin <blogic@openwrt.org>
Patchwork: https://patchwork.linux-mips.org/patch/5378/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
      cdfce539
    • R
      MIPS: Compat: Fix cputime_to_timeval() arguments in compat binfmt_elf. · 7b741aa4
      由 Ralf Baechle 提交于 
      cputime_to_timeval() takes a struct timeval *as its second argument but
a struct compat_timeval * will be passed resulting in:

  CC      arch/mips/kernel/binfmt_elfn32.o
In file included from arch/mips/kernel/binfmt_elfn32.c:122:0:
arch/mips/kernel/../../../fs/binfmt_elf.c: In function ‘fill_prstatus’:
arch/mips/kernel/../../../fs/binfmt_elf.c:1330:3: warning: passing argument 2 of ‘cputime_to_timeval’ from incompatible pointer type [enabled by default]
In file included from include/asm-generic/cputime.h:12:0,
                 from /home/ralf/src/linux/linux-mips/arch/mips/include/asm/cputime.h:4,
                 from include/linux/sched.h:28,
                 from include/linux/ptrace.h:5,
                 from include/uapi/linux/elfcore.h:7,
                 from include/linux/elfcore.h:7,
                 from arch/mips/kernel/binfmt_elfn32.c:55:
include/asm-generic/cputime_nsecs.h:92:91: note: expected ‘struct timeval *’ but argument is of type ‘struct compat_timeval *’
In file included from arch/mips/kernel/binfmt_elfn32.c:122:0:
arch/mips/kernel/../../../fs/binfmt_elf.c:1331:3: warning: passing argument 2 of ‘cputime_to_timeval’ from incompatible pointer type [enabled by default]
In file included from include/asm-generic/cputime.h:12:0,
                 from /home/ralf/src/linux/linux-mips/arch/mips/include/asm/cputime.h:4,
                 from include/linux/sched.h:28,
                 from include/linux/ptrace.h:5,
                 from include/uapi/linux/elfcore.h:7,
                 from include/linux/elfcore.h:7,
                 from arch/mips/kernel/binfmt_elfn32.c:55:
include/asm-generic/cputime_nsecs.h:92:91: note: expected ‘struct timeval *’ but argument is of type ‘struct compat_timeval *’
In file included from arch/mips/kernel/binfmt_elfn32.c:122:0:
arch/mips/kernel/../../../fs/binfmt_elf.c:1336:3: warning: passing argument 2 of ‘cputime_to_timeval’ from incompatible pointer type [enabled by default]
In file included from include/asm-generic/cputime.h:12:0,
                 from /home/ralf/src/linux/linux-mips/arch/mips/include/asm/cputime.h:4,
                 from include/linux/sched.h:28,
                 from include/linux/ptrace.h:5,
                 from include/uapi/linux/elfcore.h:7,
                 from include/linux/elfcore.h:7,
                 from arch/mips/kernel/binfmt_elfn32.c:55:
include/asm-generic/cputime_nsecs.h:92:91: note: expected ‘struct timeval *’ but argument is of type ‘struct compat_timeval *’
In file included from arch/mips/kernel/binfmt_elfn32.c:122:0:
arch/mips/kernel/../../../fs/binfmt_elf.c:1337:3: warning: passing argument 2 of ‘cputime_to_timeval’ from incompatible pointer type [enabled by default]
In file included from include/asm-generic/cputime.h:12:0,
                 from /home/ralf/src/linux/linux-mips/arch/mips/include/asm/cputime.h:4,
                 from include/linux/sched.h:28,
                 from include/linux/ptrace.h:5,
                 from include/uapi/linux/elfcore.h:7,
                 from include/linux/elfcore.h:7,
                 from arch/mips/kernel/binfmt_elfn32.c:55:
include/asm-generic/cputime_nsecs.h:92:91: note: expected ‘struct timeval *’ but argument is of type ‘struct compat_timeval *’
In file included from arch/mips/kernel/binfmt_elfn32.c:122:0:
arch/mips/kernel/../../../fs/binfmt_elf.c:1339:2: warning: passing argument 2 of ‘cputime_to_timeval’ from incompatible pointer type [enabled by default]
In file included from include/asm-generic/cputime.h:12:0,
                 from /home/ralf/src/linux/linux-mips/arch/mips/include/asm/cputime.h:4,
                 from include/linux/sched.h:28,
                 from include/linux/ptrace.h:5,
                 from include/uapi/linux/elfcore.h:7,
                 from include/linux/elfcore.h:7,
                 from arch/mips/kernel/binfmt_elfn32.c:55:
include/asm-generic/cputime_nsecs.h:92:91: note: expected ‘struct timeval *’ but argument is of type ‘struct compat_timeval *’
In file included from arch/mips/kernel/binfmt_elfn32.c:122:0:
arch/mips/kernel/../../../fs/binfmt_elf.c:1340:2: warning: passing argument 2 of ‘cputime_to_timeval’ from incompatible pointer type [enabled by default]
In file included from include/asm-generic/cputime.h:12:0,
                 from /home/ralf/src/linux/linux-mips/arch/mips/include/asm/cputime.h:4,
                 from include/linux/sched.h:28,
                 from include/linux/ptrace.h:5,
                 from include/uapi/linux/elfcore.h:7,
                 from include/linux/elfcore.h:7,
                 from arch/mips/kernel/binfmt_elfn32.c:55:
include/asm-generic/cputime_nsecs.h:92:91: note: expected ‘struct timeval *’ but argument is of type ‘struct compat_timeval *’
  AS      arch/mips/kernel/scall64-n32.o
  CC      arch/mips/kernel/signal_n32.o
  CC      arch/mips/kernel/binfmt_elfo32.o
In file included from arch/mips/kernel/binfmt_elfo32.c:165:0:
arch/mips/kernel/../../../fs/binfmt_elf.c: In function ‘fill_prstatus’:
arch/mips/kernel/../../../fs/binfmt_elf.c:1330:3: warning: passing argument 2 of ‘cputime_to_timeval’ from incompatible pointer type [enabled by default]
In file included from include/asm-generic/cputime.h:12:0,
                 from /home/ralf/src/linux/linux-mips/arch/mips/include/asm/cputime.h:4,
                 from include/linux/sched.h:28,
                 from include/linux/ptrace.h:5,
                 from include/uapi/linux/elfcore.h:7,
                 from include/linux/elfcore.h:7,
                 from arch/mips/kernel/binfmt_elfo32.c:78:
include/asm-generic/cputime_nsecs.h:92:91: note: expected ‘struct timeval *’ but argument is of type ‘struct compat_timeval *’
In file included from arch/mips/kernel/binfmt_elfo32.c:165:0:
arch/mips/kernel/../../../fs/binfmt_elf.c:1331:3: warning: passing argument 2 of ‘cputime_to_timeval’ from incompatible pointer type [enabled by default]
In file included from include/asm-generic/cputime.h:12:0,
                 from /home/ralf/src/linux/linux-mips/arch/mips/include/asm/cputime.h:4,
                 from include/linux/sched.h:28,
                 from include/linux/ptrace.h:5,
                 from include/uapi/linux/elfcore.h:7,
                 from include/linux/elfcore.h:7,
                 from arch/mips/kernel/binfmt_elfo32.c:78:
include/asm-generic/cputime_nsecs.h:92:91: note: expected ‘struct timeval *’ but argument is of type ‘struct compat_timeval *’
In file included from arch/mips/kernel/binfmt_elfo32.c:165:0:
arch/mips/kernel/../../../fs/binfmt_elf.c:1336:3: warning: passing argument 2 of ‘cputime_to_timeval’ from incompatible pointer type [enabled by default]
In file included from include/asm-generic/cputime.h:12:0,
                 from /home/ralf/src/linux/linux-mips/arch/mips/include/asm/cputime.h:4,
                 from include/linux/sched.h:28,
                 from include/linux/ptrace.h:5,
                 from include/uapi/linux/elfcore.h:7,
                 from include/linux/elfcore.h:7,
                 from arch/mips/kernel/binfmt_elfo32.c:78:
include/asm-generic/cputime_nsecs.h:92:91: note: expected ‘struct timeval *’ but argument is of type ‘struct compat_timeval *’
In file included from arch/mips/kernel/binfmt_elfo32.c:165:0:
arch/mips/kernel/../../../fs/binfmt_elf.c:1337:3: warning: passing argument 2 of ‘cputime_to_timeval’ from incompatible pointer type [enabled by default]
In file included from include/asm-generic/cputime.h:12:0,
                 from /home/ralf/src/linux/linux-mips/arch/mips/include/asm/cputime.h:4,
                 from include/linux/sched.h:28,
                 from include/linux/ptrace.h:5,
                 from include/uapi/linux/elfcore.h:7,
                 from include/linux/elfcore.h:7,
                 from arch/mips/kernel/binfmt_elfo32.c:78:
include/asm-generic/cputime_nsecs.h:92:91: note: expected ‘struct timeval *’ but argument is of type ‘struct compat_timeval *’
In file included from arch/mips/kernel/binfmt_elfo32.c:165:0:
arch/mips/kernel/../../../fs/binfmt_elf.c:1339:2: warning: passing argument 2 of ‘cputime_to_timeval’ from incompatible pointer type [enabled by default]
In file included from include/asm-generic/cputime.h:12:0,
                 from /home/ralf/src/linux/linux-mips/arch/mips/include/asm/cputime.h:4,
                 from include/linux/sched.h:28,
                 from include/linux/ptrace.h:5,
                 from include/uapi/linux/elfcore.h:7,
                 from include/linux/elfcore.h:7,
                 from arch/mips/kernel/binfmt_elfo32.c:78:
include/asm-generic/cputime_nsecs.h:92:91: note: expected ‘struct timeval *’ but argument is of type ‘struct compat_timeval *’
In file included from arch/mips/kernel/binfmt_elfo32.c:165:0:
arch/mips/kernel/../../../fs/binfmt_elf.c:1340:2: warning: passing argument 2 of ‘cputime_to_timeval’ from incompatible pointer type [enabled by default]
In file included from include/asm-generic/cputime.h:12:0,
                 from /home/ralf/src/linux/linux-mips/arch/mips/include/asm/cputime.h:4,
                 from include/linux/sched.h:28,
                 from include/linux/ptrace.h:5,
                 from include/uapi/linux/elfcore.h:7,
                 from include/linux/elfcore.h:7,
                 from arch/mips/kernel/binfmt_elfo32.c:78:
include/asm-generic/cputime_nsecs.h:92:91: note: expected ‘struct timeval *’ but argument is of type ‘struct compat_timeval *’
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
      7b741aa4
    • D
      MIPS: OCTEON: Improve _machine_halt implementation. · 38c3c0f6
      由 David Daney 提交于 
      As noted by Wladislav Wiebe:
   $ halt
   ..
   Sent SIGKILL to all processes
   Requesting system halt
   [66.729373] System halted.
   [66.733244]
   [66.734761] =====================================
   [66.739473] [ BUG: lock held at task exit time! ]
   [66.744188] 3.8.7-0-sampleversion-fct #49 Tainted: G           O
   [66.750202] -------------------------------------
   [66.754913] init/21479 is exiting with locks still held!
   [66.760234] 1 lock held by init/21479:
   [66.763990]  #0:  (reboot_mutex){+.+...}, at: [<ffffffff801776c8>] SyS_reboot+0xe0/0x218
   [66.772165]
   [66.772165] stack backtrace:
   [66.776532] Call Trace:
   [66.778992] [<ffffffff805780a8>] dump_stack+0x8/0x34
   [66.783972] [<ffffffff801618b0>] do_exit+0x610/0xa70
   [66.788948] [<ffffffff801777a8>] SyS_reboot+0x1c0/0x218
   [66.794186] [<ffffffff8013d6a4>] handle_sys64+0x44/0x64

This is an alternative fix to the one sent by Wladislav.  We kill the
watchdog for each CPU and then spin in WAIT with interrupts disabled.
This is the lowest power mode for the OCTEON.  If we were to spin with
interrupts enabled, we would get a continual stream of warning messages
and backtraces from the lockup detector, so I chose to disable
interrupts.
Signed-off-by: NDavid Daney <david.daney@cavium.com>
Cc: Maxim Uvarov <muvarov@gmail.com>
Cc: Wladislav Wiebe <wladislav.kw@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: David Daney <david.daney@cavium.com>
Patchwork: https://patchwork.linux-mips.org/patch/5324/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
      38c3c0f6