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linux_dsm_epyc7002/arch/mips/cavium-octeon
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David Daney 38c3c0f673 MIPS: OCTEON: Improve _machine_halt implementation. 
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: David 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: Ralf Baechle <ralf@linux-mips.org>
2013-06-06 16:11:26 +02:00
..
executive Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2013-03-02 07:44:16 -08:00
.gitignore MIPS: Octeon: Add device tree source files. 2012-07-23 13:54:52 +01:00
cpu.c MIPS: Octeon: Place cnmips_cu2_setup in __init memory. 2010-10-04 18:34:00 +01:00
csrc-octeon.c MIPS: Octeon: Add octeon_io_clk_delay() function. 2012-08-31 11:48:48 -07:00
dma-octeon.c x86: Don't panic if can not alloc buffer for swiotlb 2013-01-29 19:36:53 -08:00
flash_setup.c mips/octeon: 16-Bit NOR flash was not being detected during boot 2012-11-09 11:37:16 +01:00
Kconfig MIPS: Octeon: Adding driver to measure interrupt latency on Octeon. 2013-02-15 23:07:37 +01:00
Makefile MIPS: Octeon: Adding driver to measure interrupt latency on Octeon. 2013-02-15 23:07:37 +01:00
oct_ilm.c MIPS: Octeon: Adding driver to measure interrupt latency on Octeon. 2013-02-15 23:07:37 +01:00
octeon_3xxx.dts MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
octeon_68xx.dts MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
octeon_boot.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
octeon-irq.c MIPS: octeon: Fix GPIO number in IRQ chip private data 2013-05-08 01:19:07 +02:00
octeon-memcpy.S MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
octeon-platform.c MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
Platform MIPS: Octeon: Migrate to new platform makefile style. 2010-08-05 13:25:54 +01:00
serial.c MIPS: drivers: remove __dev* attributes. 2013-01-03 15:57:09 -08:00
setup.c MIPS: OCTEON: Improve _machine_halt implementation. 2013-06-06 16:11:26 +02:00
smp.c MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00