Commit Graph

3956 Commits

Author SHA1 Message Date
Nathan Lynch 8742cd2347 MIPS: Call oops_enter, oops_exit in die
This allows pause_on_oops and mtdoops to work.

Signed-off-by: Nathan Lynch <ntl@pobox.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2810/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-10-01 20:36:04 +01:00
David Daney 2f19d080fb MIPS: Octeon: Enable C0_UserLocal probing.
Octeon2 processor cores have a UserLocal register.  Remove the hard
coded negative probe and allow the standard probing to detect this
feature.

Signed-off-by: David Daney <david.daney@cavium.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2578/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-24 01:44:41 +02:00
David Daney 0f4ccbc835 MIPS: No branches in delay slots for huge pages in handle_tlbl
For the case PM_DEFAULT_MASK == 0, we were placing a branch in the
delay slot of another branch.  This leads to undefined behavior.

Signed-off-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2775/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-21 17:54:07 +02:00
David Daney d968275921 MIPS: Don't clobber CP0_STATUS value for CONFIG_MIPS_MT_SMTC
Reported-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Signed-off-by: David Daney <david.daney@cavium.com>
Patchwork: https://patchwork.linux-mips.org/patch/2753/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-21 17:54:02 +02:00
David Daney 465aaed003 MIPS: Octeon: Select CONFIG_HOLES_IN_ZONE
Current Octeon systems do in fact have holes in their memory zones.
We need to select HOLES_IN_ZONE.  If we do not, some memory
configurations will result in crashes at boot time like this:

.
.
.
CPU 6 Unable to handle kernel paging request at virtual address 0000000000700000, epc == ffffffff8118fe00, ra == ffffffff8118fe9c
Oops[#1]:
Cpu 6
.
.
.
        ...
Call Trace:
[<ffffffff8118fe00>] setup_per_zone_wmarks+0x1b0/0x338
[<ffffffff815cd738>] init_per_zone_wmark_min+0x64/0xd0
[<ffffffff81100438>] do_one_initcall+0x38/0x160
.
.
.

Reported-by: Jason Kwon <jason.kwon@ericsson.com>
Signed-off-by: David Daney <david.daney@cavium.com>
To: linux-mips@linux-mips.org
Cc: Jason Kwon <jason.kwon@ericsson.com>
Patchwork: https://patchwork.linux-mips.org/patch/2724/
Tested-by: Guenter Roeck<guenter.roeck@ericsson.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-21 17:53:56 +02:00
Rafael J. Wysocki bd7100099a MIPS: PM: Use struct syscore_ops instead of sysdevs for PM (v2)
Convert some MIPS architecture's code to using struct syscore_ops
objects for power management instead of sysdev classes and sysdevs.

This simplifies the code and reduces the kernel's memory footprint.
It also is necessary for removing sysdevs from the kernel entirely in
the future.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-and-tested-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: linux-kernel@vger.kernel.org
Cc: "Rafael J.  Wysocki" <rjw@sisk.pl>
Patchwork: http://patchwork.linux-mips.org/patch/2431/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-21 17:53:51 +02:00
Yong Zhang 1eec6cd08b MIPS: Compat: Use 32-bit wrapper for compat_sys_futex.
We can't trust userspace to pass signed-extend arguments.  Not correctly
sign-extended arguments to futex-wait result in architecturally undefined
operation of 32-bit arithmetic instructions.

For example, if 'val' is too big and bit-31 is 1, the caller may enter
endless loop at:

futex_wait_setup()
{
	...

	if (uval != val) {
		queue_unlock(q, *hb);
		ret = -EWOULDBLOCK;

	...
}

Signed-off-by: Yong Zhang <yong.zhang@windriver.com>
To: linux-mips@linux-mips.org
To: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/2714/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-21 17:53:44 +02:00
Arnaud Lacombe b8ecf341f1 MIPS: Do not use EXTRA_CFLAGS
Usage of these flags has been deprecated for nearly 4 years by:

    commit f77bf01425
    Author: Sam Ravnborg <sam@neptun.(none)>
    Date:   Mon Oct 15 22:25:06 2007 +0200

        kbuild: introduce ccflags-y, asflags-y and ldflags-y

Moreover, these flags (at least EXTRA_CFLAGS) have been documented for command
line use. By default, gmake(1) do not override command line setting, so this is
likely to result in build failure or unexpected behavior.

Replace their usage by Kbuild's `{as,cc,ld}flags-y'.

To: linux-kernel@vger.kernel.org
Cc: Sam Ravnborg <sam@ravnborg.org>
Patchwork: https://patchwork.linux-mips.org/patch/2710/
Cc: linux-mips@linux-mips.org
Signed-off-by: Arnaud Lacombe <lacombar@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-21 17:53:38 +02:00
Manuel Lauss dd0a028183 MIPS: Alchemy: DB1200: Disable cascade IRQ in handler
Disable the cascade IRQ in the cascade handler.  This is required to
get the DB1300 working, and also gets rid of all spurious interrupts
previously observed on the DB1200; so Config[OD] can be disabled
again for better performance.

Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com>
To: Linux-MIPS <linux-mips@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/2708/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-09-21 17:53:32 +02:00
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 28f65c11f2
  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
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
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 dac853ae89 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
Florian Fainelli 11454100f4 MIPS: AR7: Remove 'space before tabs' in platform.c
Signed-off-by: Florian Fainelli <florian@openwrt.org>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2490/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-07-25 17:22:49 +01:00
Jonas Bonn 66574cc054 modules: make arch's use default loader hooks
This patch removes all the module loader hook implementations in the
architecture specific code where the functionality is the same as that
now provided by the recently added default hooks.

Signed-off-by: Jonas Bonn <jonas@southpole.se>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Tested-by: Michal Simek <monstr@monstr.eu>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2011-07-24 22:06:04 +09:30