4208 Commits

Author SHA1 Message Date
John Crispin
0596954681 MIPS: Lantiq: Fix setting the PCI bus speed on AR9
The bits used to set the PCI bus speed on AR9 are slightly different to
those used on Danube.

Signed-off-by: John Crispin <blogic@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2614/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-21 17:53:18 +02:00
John Crispin
77fbdb30f0 MIPS: Lantiq: Fix external interrupt sources
The irq base offset needs to be ignored when matching irqs to external
interrupt pins. Taking the offset into account resulted in the EIU not
being brought up properly.

Signed-off-by: John Crispin <blogic@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2616/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-21 17:53:12 +02:00
Ralf Baechle
d954ffe34a MIPS: tlbex: Fix build error in R3000 code.
Only some GCC versions such as gcc 4.2 notice that the variable wr in
build_r3000_tlb_modify_handler is used uninitialized.  When using one
of those GCCs the build will fail due to -Werror.  GCC 4.6 does not
warn about the uninitialized use of wr.

This issue was introduced by 7211f4d7a3dcbe57c5d396c334dca525315dceb2
[MIPS: Close races in TLB modify handlers.]

Reported-by: Ganesan Ramalingam <ganesan18@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-21 17:53:07 +02:00
Manuel Lauss
870168a031 MIPS: Alchemy: Include Au1100 in PM code.
The current code forgets the Au1100 when looking for the correct method to
suspend the chip.

Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2675/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-21 17:53:01 +02:00
Manuel Lauss
c78c488273 MIPS: Alchemy: Fix typo in MAC0 registration
Harmless typo which prints an error message although MAC0 was registered
successfully.

Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2672/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-21 17:52:52 +02:00
Ralf Baechle
a705dc7cf4 MIPS: MSP71xx: Fix build error.
CC      arch/mips/pmc-sierra/msp71xx/msp_irq.o
/home/ralf/src/linux/linux-mips/arch/mips/pmc-sierra/msp71xx/msp_irq.c:112:2: error: request for member ‘flags’ in something not a structure or union
/home/ralf/src/linux/linux-mips/arch/mips/pmc-sierra/msp71xx/msp_irq.c:118:2: error: request for member ‘flags’ in something not a structure or union
make[4]: *** [arch/mips/pmc-sierra/msp71xx/msp_irq.o] Error 1

caused by 57336bc1056798d89714b7fb1b1d197e6bda6819 [MIPS: Mark cascade and
low level interrupts IRQF_NO_THREAD].

Commas to separate struct initializers generally are considered useful to
enhance the compilation experience of the user.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-21 17:52:44 +02:00
Ralf Baechle
1f717929e9 MIPS: Handle __put_user() sleeping.
do_signal() does __put_user() which can fault, resulting in a might_sleep()
warning in down_read(&mm->mmap_sem) and a "scheduling while atomic" warning
when mmap_sem is contented. On Swarm this also results in:

WARNING: at kernel/smp.c:459 smp_call_function_many+0x148/0x398()
Modules linked in:
Call Trace:

[<ffffffff804b48a4>] dump_stack+0x1c/0x50
[<ffffffff8013dc94>] warn_slowpath_common+0x8c/0xc8
[<ffffffff8013dcfc>] warn_slowpath_null+0x2c/0x40
[<ffffffff801864a0>] smp_call_function_many+0x148/0x398
[<ffffffff80186748>] smp_call_function+0x58/0xa8
[<ffffffff80119b5c>] r4k_flush_data_cache_page+0x54/0xd8
[<ffffffff801f39bc>] handle_pte_fault+0xa9c/0xad0
[<ffffffff801f40d0>] handle_mm_fault+0x158/0x200
[<ffffffff80115548>] do_page_fault+0x218/0x3b0
[<ffffffff80102744>] ret_from_exception+0x0/0x10
[<ffffffff8010eb18>] copy_siginfo_to_user32+0x50/0x298
[<ffffffff8010edf0>] setup_rt_frame_32+0x90/0x250
[<ffffffff80106414>] do_notify_resume+0x154/0x358
[<ffffffff80102930>] work_notifysig+0xc/0x14

Fixed by enabling interrupts in do_notify_resume before delivering signals.

[ralf@linux-mips.org: Reported and original fix by tglx but I wanted to
minimize the amount of code being run with interrupts disabled so I moved
the local_irq_disable() call right into do_notify_resume.  Which is saner
than doing it in entry.S.]

Reported-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-21 17:52:38 +02:00
Thomas Gleixner
0f462e3c12 MIPS: Allow forced irq threading
All low level interrupts have been marked NO_THREAD, so MIPS can enjoy
the wonderful world of forced threaded interrupt handlers.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2639/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-21 17:52:34 +02:00
Liming Wang
5c22cd4075 MIPS: i8259: Mark cascade interrupt non-threaded
Cascade interrupts cannot be threaded.

Signed-off-by: Liming Wang <liming.wang@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1314370804-21266-1-git-send-email-liming.wang@windriver.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2770/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-21 17:52:28 +02:00
Wu Zhangjin
77cbece767 MIPS: Loongson: Mark cascade interrupts IRQF_NO_THREAD
There are two cascade interrupts in Loongson machines, one for bonito
northbridge, another for the 8259A controller in the southbridge. Both
want to be non threaded.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mips@linux-mips.org
Cc: Wu Zhangjin <wuzhangjin@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/2638/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-21 17:52:22 +02:00
Wu Zhangjin
5a4a4ad851 MIPS: Mark cascade and low level interrupts IRQF_NO_THREAD
Mark interrupts with no_action handler, cascade interrupts, low level
interrupts (bus error, halt ..) with IRQF_NO_THREAD to exclude them
from forced threading.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mips@linux-mips.org
Cc: Wu Zhangjin <wuzhangjin@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-21 17:52:15 +02:00
Wu Zhangjin
4d85f6afa4 MIPS: Make the die_lock be raw
On preempt-rt this lock needs to be raw, so it does not get converted
to a sleeping spinlock. Trying to sleep in a panic is not really
desireable.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2636/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-21 17:52:09 +02:00
Thomas Gleixner
49de830ad7 MIPS: Ftrace: Fix the CONFIG_DYNAMIC_FTRACE=n compile
arch/mips/kernel/ftrace.c: In function ‘ftrace_get_parent_ra_addr’:
arch/mips/kernel/ftrace.c:212: error: implicit declaration of function ‘in_kernel_space’
arch/mips/kernel/ftrace.c: In function ‘prepare_ftrace_return’:
arch/mips/kernel/ftrace.c:314: error: ‘MCOUNT_OFFSET_INSNS’ undeclared (first use in this function)
arch/mips/kernel/ftrace.c:314: error: (Each undeclared identifier is reported only once
arch/mips/kernel/ftrace.c:314: error: for each function it appears in.)

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2634/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-21 17:52:04 +02:00
Yoichi Yuasa
20ef5d3a23 MIPS: RC32434: Fix PCI build error
arch/mips/pci/pci-rc32434.c: In function 'rc32434_pci_init':
arch/mips/pci/pci-rc32434.c:217:16: error: 'rcrc32434_res_pci_io1' undeclared (first use in this function)
arch/mips/pci/pci-rc32434.c:217:16: note: each undeclared identifier is reported only once for each function it appears in
make[1]: *** [arch/mips/pci/pci-rc32434.o] Error 1

This problem is included in the following commit.

  commit 28f65c11f2ffb3957259dece647a24f8ad2e241b
  Author: Joe Perches <joe@perches.com>
  Date:   Thu Jun 9 09:13:32 2011 -0700

      treewide: Convert uses of struct resource to resource_size(ptr)

Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org>
Cc: linux-mips <linux-mips@linux-mips.org>
Cc: Joe Perches <joe@perches.com>
Patchwork: https://patchwork.linux-mips.org/patch/2654/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-21 17:51:57 +02:00
Jesper Juhl
d4001e086b MIPS: Remove unneeded version.h includes from arch/mips/
It was pointed out by 'make versioncheck' that some includes of
linux/version.h are not needed in arch/mips/.
This patch removes them.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
To: LKML <linux-kernel@vger.kernel.org>
Cc: trivial@kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2540/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-17 02:40:36 +02:00
Kevin Cernekee
1665010757 MIPS: Trivial style cleanups in mmap.c
Fix checkpatch warnings.  Rename arch_get_unmapped_area_foo() to
arch_get_unmapped_area_common().  Make indentations and spacing more
consistent.  Add <linux/compiler.h> for likely/unlikely.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Cc: Jian Peng <jipeng2005@gmail.com>
Cc: David Daney <ddaney@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2506/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-17 02:37:04 +02:00
Hillf Danton
fe0b030cf0 MIPS: i8259: Correct comment for i8259
The comment for the slave PIC is changed from 8259A-1 to 8259A-2.

Signed-off-by: Hillf Danton <dhillf@gmail.com>
To:  LKML <linux-kernel@vger.kernel.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2693/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-17 02:37:04 +02:00
Hillf Danton
9fbcbd7e1f MIPS: VPE: Select correct tc
If we could find tc on the tc list for @index, the found tc should be returned.

Signed-off-by: Hillf Danton <dhillf@gmail.com>
To: LKML <linux-kernel@vger.kernel.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2692/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-17 02:37:03 +02:00
Jiri Pirko
4bc71cb983 net: consolidate and fix ethtool_ops->get_settings calling
This patch does several things:
- introduces __ethtool_get_settings which is called from ethtool code and
  from drivers as well. Put ASSERT_RTNL there.
- dev_ethtool_get_settings() is replaced by __ethtool_get_settings()
- changes calling in drivers so rtnl locking is respected. In
  iboe_get_rate was previously ->get_settings() called unlocked. This
  fixes it. Also prb_calc_retire_blk_tmo() in af_packet.c had the same
  problem. Also fixed by calling __dev_get_by_index() instead of
  dev_get_by_index() and holding rtnl_lock for both calls.
- introduces rtnl_lock in bnx2fc_vport_create() and fcoe_vport_create()
  so bnx2fc_if_create() and fcoe_if_create() are called locked as they
  are from other places.
- use __ethtool_get_settings() in bonding code

Signed-off-by: Jiri Pirko <jpirko@redhat.com>

v2->v3:
	-removed dev_ethtool_get_settings()
	-added ASSERT_RTNL into __ethtool_get_settings()
	-prb_calc_retire_blk_tmo - use __dev_get_by_index() and lock
	 around it and __ethtool_get_settings() call
v1->v2:
        add missing export_symbol
Reviewed-by: Ben Hutchings <bhutchings@solarflare.com> [except FCoE bits]
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-09-15 17:32:26 -04:00
NeilBrown
f5b9409973 All Arch: remove linkage for sys_nfsservctl system call
The nfsservctl system call is now gone, so we should remove all
linkage for it.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-08-26 15:09:58 -07:00
Jamie Iles
03972fc214 mips: msp71xx/serial: add workaround for DW UART
The Synopsys DesignWare UART in pmc-sierra msp71xx has an extra feature
where the UART detects a write attempt to the LCR whilst busy and raises
an interrupt.  The driver needs to clear the interrupt and rewrite the
LCR.  Move this into platform code and out of the 8250 driver.

Acked-by: Ralf Baechle <ralf@linux-mips.org>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-08-23 10:53:00 -07:00
Jamie Iles
91e8db593c mips: msp71xx/serial: convert to pr_foo() helpers
Convert to pr_foo() helpers rather than printk(KERN_.*).

Acked-by: Ralf Baechle <ralf@linux-mips.org>
Acked-by: Anoop P A<Anoop_P.A@pmc-sierra.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-08-23 10:52:59 -07:00
Hauke Mehrtens
a3e72cd297 bcm47xx: fix irq assignment for new SoCs.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2011-08-08 14:29:33 -04:00
Hauke Mehrtens
c1d1c5d421 bcm47xx: add support for bcma bus
This patch add support for the bcma bus. Broadcom uses only Mips 74K
CPUs on the new SoC and on the old ons using ssb bus there are no Mips
74K CPUs.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2011-08-08 14:29:32 -04:00
Hauke Mehrtens
a656ffcbc7 bcm47xx: make it possible to build bcm47xx without ssb.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2011-08-08 14:29:31 -04:00
Hauke Mehrtens
08ccf57283 bcm47xx: prepare to support different buses
Prepare bcm47xx to support different System buses. Before adding
support for bcma it should be possible to build bcm47xx without the
need of ssb. With this patch bcm47xx does not directly contain a
ssb_bus, but a union contain all the supported system buses. As a SoC
just uses one system bus a union is a good choice.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2011-08-08 14:29:30 -04:00
Mark Brown
18d4ed4342 Merge branch 'for-3.1' into for-3.2
Conflict due to the fix for the register map failure - taken the for-3.1
version.

Conflicts:
	sound/soc/codecs/sgtl5000.c
2011-08-08 14:56:19 +09:00
Manuel Lauss
adbc7a5a61 ASoC: au1x: update db1200 machine to the new way of things
The use of the "soc-audio" platform device is no longer en vogue,
update the code to the newer, simpler way of doing things.

Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-07-27 19:16:47 +01:00
Manuel Lauss
5b0912be7a ASoC: au1x: remove automatic DMA device registration from PSC drivers
The PSC audio drivers (psc-ac97/psc-i2s) register the DMA platform_device
on their own.  This is frowned upon, from now on board code must
register a simple pcm dma platform device for each PSC with sound duties.

Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-07-27 19:16:23 +01:00
Manuel Lauss
b2ce305dda ASoC: Add a DB1x00 AC97 machine driver
Add a machine driver suitable for the AC97 part on the DB1000/DB1500/DB1100
boards.

Run-tested on DB1500.

Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-07-27 19:10:48 +01:00
Arun Sharma
7847777a45 atomic: cleanup asm-generic atomic*.h inclusion
After changing all consumers of atomics to include <linux/atomic.h>, we
ran into some compile time errors due to this dependency chain:

linux/atomic.h
  -> asm/atomic.h
    -> asm-generic/atomic-long.h

where atomic-long.h could use funcs defined later in linux/atomic.h
without a prototype.  This patches moves the code that includes
asm-generic/atomic*.h to linux/atomic.h.

Archs that need <asm-generic/atomic64.h> need to select
CONFIG_GENERIC_ATOMIC64 from now on (some of them used to include it
unconditionally).

Compile tested on i386 and x86_64 with allnoconfig.

Signed-off-by: Arun Sharma <asharma@fb.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: David Miller <davem@davemloft.net>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-07-26 16:49:47 -07:00
Arun Sharma
f24219b4e9 atomic: move atomic_add_unless to generic code
This is in preparation for more generic atomic primitives based on
__atomic_add_unless.

Signed-off-by: Arun Sharma <asharma@fb.com>
Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>
Reviewed-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: David Miller <davem@davemloft.net>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-07-26 16:49:47 -07:00
Arun Sharma
60063497a9 atomic: use <linux/atomic.h>
This allows us to move duplicated code in <asm/atomic.h>
(atomic_inc_not_zero() for now) to <linux/atomic.h>

Signed-off-by: Arun Sharma <asharma@fb.com>
Reviewed-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: David Miller <davem@davemloft.net>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-07-26 16:49:47 -07:00
Linus Torvalds
6fd4ce8864 Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/upstream-linus
* 'upstream' of git://git.linux-mips.org/pub/scm/upstream-linus: (31 commits)
  MIPS: Close races in TLB modify handlers.
  MIPS: Add uasm UASM_i_SRL_SAFE macro.
  MIPS: RB532: Use hex_to_bin()
  MIPS: Enable cpu_has_clo_clz for MIPS Technologies' platforms
  MIPS: PowerTV: Provide cpu-feature-overrides.h
  MIPS: Remove pointless return statement from empty void functions.
  MIPS: Limit fixrange_init() to the FIXMAP region
  MIPS: Install handlers for software IRQs
  MIPS: Move FIXADDR_TOP into spaces.h
  MIPS: Add SYNC after cacheflush
  MIPS: pfn_valid() is broken on low memory HIGHMEM systems
  MIPS: HIGHMEM DMA on noncoherent MIPS32 processors
  MIPS: topdown mmap support
  MIPS: Remove redundant addr_limit assignment on exec.
  MIPS: AR7: Replace __attribute__((__packed__)) with __packed
  MIPS: AR7: Remove 'space before tabs' in platform.c
  MIPS: Lantiq: Add missing clk_enable and clk_disable functions.
  MIPS: AR7: Fix trailing semicolon bug in clock.c
  MAINTAINERS: Update MIPS entry.
  MIPS: BCM63xx: Remove duplicate PERF_IRQSTAT_REG definition
  ...
2011-07-26 14:17:28 -07:00
David Daney
bf28607fbe MIPS: Close races in TLB modify handlers.
Page table entries are made invalid by writing a zero into the the PTE
slot in a page table.  This creates a race condition with the TLB
modify handlers when they are updating the PTE.

CPU0                              CPU1

Test for _PAGE_PRESENT
.                                 set to not _PAGE_PRESENT (zero)
Set to _PAGE_VALID

So now the page not present value (zero) is suddenly valid and user
space programs have access to physical page zero.

We close the race by putting the test for _PAGE_PRESENT and setting of
_PAGE_VALID into an atomic LL/SC section.  This requires more registers
than just K0 and K1 in the handlers, so we need to save some registers
to a save area and then restore them when we are done.

The save area is an array of cacheline aligned structures that should
not suffer cache line bouncing as they are CPU private.

[ralf@linux-mips.org: Fix !defined(CONFIG_MIPS_PGD_C0_CONTEXT) build error.]

Signed-off-by: David Daney <david.daney@cavium.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2577/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-07-26 06:47:47 +01:00
David Daney
f0daaaf523 MIPS: Add uasm UASM_i_SRL_SAFE macro.
This can be used from either 32-bit or 64-bit code to generate logical
right shifts of any constant amount.

Signed-off-by: David Daney <david.daney@cavium.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2576/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-07-26 06:47:36 +01:00
Linus Torvalds
d3ec4844d4 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (43 commits)
  fs: Merge split strings
  treewide: fix potentially dangerous trailing ';' in #defined values/expressions
  uwb: Fix misspelling of neighbourhood in comment
  net, netfilter: Remove redundant goto in ebt_ulog_packet
  trivial: don't touch files that are removed in the staging tree
  lib/vsprintf: replace link to Draft by final RFC number
  doc: Kconfig: `to be' -> `be'
  doc: Kconfig: Typo: square -> squared
  doc: Konfig: Documentation/power/{pm => apm-acpi}.txt
  drivers/net: static should be at beginning of declaration
  drivers/media: static should be at beginning of declaration
  drivers/i2c: static should be at beginning of declaration
  XTENSA: static should be at beginning of declaration
  SH: static should be at beginning of declaration
  MIPS: static should be at beginning of declaration
  ARM: static should be at beginning of declaration
  rcu: treewide: Do not use rcu_read_lock_held when calling rcu_dereference_check
  Update my e-mail address
  PCIe ASPM: forcedly -> forcibly
  gma500: push through device driver tree
  ...

Fix up trivial conflicts:
 - arch/arm/mach-ep93xx/dma-m2p.c (deleted)
 - drivers/gpio/gpio-ep93xx.c (renamed and context nearby)
 - drivers/net/r8169.c (just context changes)
2011-07-25 13:56:39 -07:00
Andy Shevchenko
c8e58856f2 MIPS: RB532: Use hex_to_bin()
Remove custom implementation of hex_to_bin().

Signed-off-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
To: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1580/
Acked-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-07-25 17:26:56 +01:00
Shinya Kuribayashi
5fba096080 MIPS: Enable cpu_has_clo_clz for MIPS Technologies' platforms
Enable cpu_has_clo_clz only when CONFIG_CPU_MIPS32 or CONFIG_CPU_MIPS64
is selected.  This will optimize fls() and __fls() to use CLZ insn, and
eventually ffs() and __ffs() as well.

Malta and MIPSSim are development platforms, and need to take care of
various processor configurations, release rivisions and so on, even
across different MIPS ISAs.  For such platforms we have to be careful,
for instance, with turning on cpu_has_mips{32,64}r[12] features.

As for CLZ, all MIPS32/64 processors support it, regardless of release
revisions.

Signed-off-by: Shinya Kuribayashi <skuribay@pobox.com>
To: David VomLehn <dvomlehn@cisco.com>
To: macro@linux-mips.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1453/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-07-25 17:26:55 +01:00
David VomLehn
c2b78c8e82 MIPS: PowerTV: Provide cpu-feature-overrides.h
This will optimize fls() and __fls() to use CLZ throughout the kernel,
and any other optimizations that depend on constant cpu_has_* values
will also be used.

Signed-off-by: David VomLehn <dvomlehn@cisco.com>
Signed-off-by: Shinya Kuribayashi <skuribay@pobox.com>
To: David VomLehn <dvomlehn@cisco.com>
To: macro@linux-mips.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1452/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-07-25 17:26:55 +01:00
Ralf Baechle
98f4a2c27c MIPS: Remove pointless return statement from empty void functions.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
To: Sergei Shtylyov <sshtylyov@mvista.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2391/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-07-25 17:26:55 +01:00
Kevin Cernekee
464fd83e84 MIPS: Limit fixrange_init() to the FIXMAP region
fixrange_init() allocates page tables for all addresses higher than
FIXADDR_TOP.  On processors that override the default FIXADDR_TOP
address of 0xfffe_0000, this can consume up to 4 pages (1 page per 4MB)
for pgd's that are never used.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1980/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-07-25 17:26:54 +01:00
Kevin Cernekee
273f2d7e64 MIPS: Install handlers for software IRQs
BMIPS4350/4380/5000 CMT/SMT all use SW INT0/INT1 for inter-thread
signaling.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1709/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-07-25 17:26:54 +01:00
Kevin Cernekee
565b60de32 MIPS: Move FIXADDR_TOP into spaces.h
Memory maps and addressing quirks are normally defined in <spaces.h>.
There are already three targets that need to override FIXADDR_TOP, and
others exist.  This will be a cleaner approach than adding lots of
ifdefs in fixmap.h .

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Cc: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1573/
Acked-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-07-25 17:26:53 +01:00
Kevin Cernekee
d0023c4a0a MIPS: Add SYNC after cacheflush
On processors with deep write buffers, it is likely that many cycles
will pass between a CACHE instruction and the time the data actually
gets written out to DRAM.  Add a SYNC instruction to ensure that the
buffers get emptied before the flush functions return.

Actual problem seen in the wild:

1) dma_alloc_coherent() allocates cached memory

2) memset() is called to clear the new pages

3) dma_cache_wback_inv() is called to flush the zero data out to memory

4) dma_alloc_coherent() returns an uncached (kseg1) pointer to the
freshly allocated pages

5) Caller writes data through the kseg1 pointer

6) Buffered writeback data finally gets flushed out to DRAM

7) Part of caller's data is inexplicably zeroed out

This patch adds SYNC between steps 3 and 4, which fixed the problem.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: 
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-07-25 17:26:53 +01:00
Kevin Cernekee
b6da0ffb09 MIPS: pfn_valid() is broken on low memory HIGHMEM systems
pfn_valid() compares the PFN to max_mapnr:

        __pfn >= min_low_pfn && __pfn < max_mapnr;

On HIGHMEM kernels, highend_pfn is used to set the value of max_mapnr.
Unfortunately, highend_pfn is left at zero if the system does not
actually have enough RAM to reach into the HIGHMEM range.  This causes
pfn_valid() to always return false, and when debug checks are enabled
the kernel will fail catastrophically:

Memory: 22432k/32768k available (2249k kernel code, 10336k reserved, 653k data, 1352k init, 0k highmem)
NR_IRQS:128
kfree_debugcheck: out of range ptr 81c02900h.
Kernel bug detected[#1]:
Cpu 0
$ 0   : 00000000 10008400 00000034 00000000
$ 4   : 8003e160 802a0000 8003e160 00000000
$ 8   : 00000000 0000003e 00000747 00000747
...

On such a configuration, max_low_pfn should be used to set max_mapnr.

This was seen on 2.6.34.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
To: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1992/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-07-25 17:26:52 +01:00
Dezhong Diao
e36863a550 MIPS: HIGHMEM DMA on noncoherent MIPS32 processors
[v4: Patch applies to linux-queue.git with kmap_atomic patches:
 https://patchwork.kernel.org/patch/189932/
 https://patchwork.kernel.org/patch/194552/
 https://patchwork.kernel.org/patch/189912/ ]

The MIPS DMA coherency functions do not work properly (i.e. kernel oops)
when HIGHMEM pages are passed in as arguments.  Use kmap_atomic() to
temporarily map high pages for cache maintenance operations.

Tested on a 2.6.36-rc7 1GB HIGHMEM SMP no-alias system.

Signed-off-by: Dezhong Diao <dediao@cisco.com>
Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Cc: Dezhong Diao <dediao@cisco.com>
Cc: David Daney <ddaney@caviumnetworks.com>
Cc: David VomLehn <dvomlehn@cisco.com>
Cc: Sergei Shtylyov <sshtylyov@mvista.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1695/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-07-25 17:26:52 +01:00
Jian Peng
d0be89f6c2 MIPS: topdown mmap support
This patch introduced topdown mmap support in user process address
space allocation policy.

Recently, we ran some large applications that use mmap heavily and
lead to OOM due to inflexible mmap allocation policy on MIPS32.

Since most other major archs supported it for years, it is reasonable
to follow the trend and reduce the pain of porting applications.

Due to cache aliasing concern, arch_get_unmapped_area_topdown() and
other helper functions are implemented in arch/mips/kernel/syscall.c.

Signed-off-by: Jian Peng <jipeng2005@gmail.com>
Cc: David Daney <ddaney@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2389/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-07-25 17:26:51 +01:00
Mathias Krause
3a7136602b MIPS: Remove redundant addr_limit assignment on exec.
The address limit is already set in flush_old_exec() via set_fs(USER_DS)
so this assignment is redundant.

[ralf@linux-mips.org: also see dac853ae89043f1b7752875300faf614de43c74b for
further explanation.]

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/2466/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-07-25 17:23:29 +01:00
Florian Fainelli
c4a5054161 MIPS: AR7: Replace __attribute__((__packed__)) with __packed
Signed-off-by: Florian Fainelli <florian@openwrt.org>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2491/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org
2011-07-25 17:23:20 +01:00