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Author SHA1 Message Date
Wolfram Sang
4ee045f4e9 Merge branch 'for-wolfram' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio into i2c/for-4.15 
Refactor i2c-gpio and its users to use gpiod. Done by GPIO maintainer
LinusW.
 2017-11-01 23:45:46 +01:00
Linus Walleij
4d0ce62c0a i2c: gpio: Augment all boardfiles to use open drain 
We now handle the open drain mode internally in the I2C GPIO
driver, but we will get warnings from the gpiolib that we
override the default mode of the line so it becomes open
drain.

We can fix all in-kernel users by simply passing the right
flag along in the descriptor table, and we already touched
all of these files in the series so let's just tidy it up.

Cc: Steven Miao <realmz6@gmail.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Acked-by: Olof Johansson <olof@lixom.net>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Acked-by: Wu, Aaron <Aaron.Wu@analog.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
 2017-10-30 08:42:43 +01:00
Linus Walleij
b2e6355559 i2c: gpio: Convert to use descriptors 
This converts the GPIO-based I2C-driver to using GPIO
descriptors instead of the old global numberspace-based
GPIO interface. We:

- Convert the driver to unconditionally grab two GPIOs
  from the device by index 0 (SDA) and 1 (SCL) which
  will work fine with device tree and descriptor tables.
  The existing device trees will continue to work just
  like before, but without any roundtrip through the
  global numberspace.

- Brutally convert all boardfiles still passing global
  GPIOs by registering descriptor tables associated with
  the devices instead so this driver does not need to keep
  supporting passing any GPIO numbers as platform data.

There is no stepwise approach as elegant as this, I
strongly prefer this big hammer over any antsteps for this
conversion. This way the old GPIO numbers go away and
NEVER COME BACK.

Special conversion for the different boards utilizing
I2C-GPIO:

- EP93xx (arch/arm/mach-ep93xx): pretty straight forward as
  all boards were using the same two GPIO lines, just define
  these two in a lookup table for "i2c-gpio" and register
  these along with the device. None of them define any
  other platform data so just pass NULL as platform data.
  This platform selects GPIOLIB so all should be smooth.
  The pins appear on a gpiochip for bank "G" as pins 1 (SDA)
  and 0 (SCL).

- IXP4 (arch/arm/mach-ixp4): descriptor tables have to
  be registered for each board separately. They all use
  "IXP4XX_GPIO_CHIP" so it is pretty straight forward.
  Most board define no other platform data than SCL/SDA
  so they can drop the #include of <linux/i2c-gpio.h> and
  assign NULL to platform data.

  The "goramo_mlr" (Goramo Multilink Router) board is a bit
  worrisome: it implements its own I2C bit-banging in the
  board file, and optionally registers an I2C serial port,
  but claims the same GPIO lines for itself in the board file.
  This is not going to work: there will be competition for the
  GPIO lines, so delete the optional extra I2C bus instead, no
  I2C devices are registered on it anyway, there are just hints
  that it may contain an EEPROM that may be accessed from
  userspace. This needs to be fixed up properly by the serial
  clock using I2C emulation so drop a note in the code.

- KS8695 board acs5k (arch/arm/mach-ks8695/board-acs5.c)
  has some platform data in addition to the pins so it needs to
  be kept around sans GPIO lines. Its GPIO chip is named
  "KS8695" and the arch selects GPIOLIB.

- PXA boards (arch/arm/mach-pxa/*) use some of the platform
  data so it needs to be preserved here. The viper board even
  registers two GPIO I2Cs. The gpiochip is named "gpio-pxa" and
  the arch selects GPIOLIB.

- SA1100 Simpad (arch/arm/mach-sa1100/simpad.c) defines a GPIO
  I2C bus, and the arch selects GPIOLIB.

- Blackfin boards (arch/blackfin/bf533 etc) for these I assume
  their I2C GPIOs refer to the local gpiochip defined in
  arch/blackfin/kernel/bfin_gpio.c names "BFIN-GPIO".
  The arch selects GPIOLIB. The boards get spiked with
  IF_ENABLED(I2C_GPIO) but that is a side effect of it
  being like that already (I would just have Kconfig select
  I2C_GPIO and get rid of them all.) I also delete any
  platform data set to 0 as it will get that value anyway
  from static declartions of platform data.

- The MIPS selects GPIOLIB and the Alchemy machine is using
  two local GPIO chips, one of them has a GPIO I2C. We need
  to adjust the local offset from the global number space here.
  The ATH79 has a proper GPIO driver in drivers/gpio/gpio-ath79.c
  and AFAICT the chip is named "ath79-gpio" and the PB44
  PCF857x expander spawns from this on GPIO 1 and 0. The latter
  board only use the platform data to specify pins so it can be
  cut altogether after this.

- The MFD Silicon Motion SM501 is a special case. It dynamically
  spawns an I2C bus off the MFD using sm501_create_subdev().
  We use an approach to dynamically create a machine descriptor
  table and attach this to the "SM501-LOW" or "SM501-HIGH"
  gpiochip. We use chip-local offsets to grab the right lines.
  We can get rid of two local static inline helpers as part
  of this refactoring.

Cc: Steven Miao <realmz6@gmail.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Magnus Damm <magnus.damm@gmail.com>
Cc: Ben Dooks <ben.dooks@codethink.co.uk>
Cc: Heiko Schocher <hs@denx.de>
Acked-by: Wu, Aaron <Aaron.Wu@analog.com>
Acked-by: Olof Johansson <olof@lixom.net>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
 2017-10-30 08:42:21 +01:00
Paul Burton
ca8eb05b5f MIPS: math-emu: Remove pr_err() calls from fpu_emu() 
The FPU emulator includes 2 calls to pr_err() which are triggered by
invalid instruction encodings for MIPSr6 cmp.cond.fmt instructions.
These cases are not kernel errors, merely invalid instructions which are
already handled by delivering a SIGILL which will provide notification
that something failed in cases where that makes sense.

In cases where that SIGILL is somewhat expected & being handled, for
example when crashme happens to generate one of the affected bad
encodings, the message is printed with no useful context about what
triggered it & spams the kernel log for no good reason.

Remove the pr_err() calls to make crashme run silently & treat the bad
encodings the same way we do others, with a SIGILL & no further kernel
log output.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Fixes: f8c3c6717a ("MIPS: math-emu: Add support for the CMP.condn.fmt R6 instruction")
Cc: linux-mips@linux-mips.org
Cc: stable <stable@vger.kernel.org> # v4.3+
Patchwork: https://patchwork.linux-mips.org/patch/17253/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-10-09 16:33:34 +02:00
Paul Burton
e1270575fb MIPS: Fix generic-board-config.sh for builds using O= 
When configuring the kernel using one of the generic MIPS defconfig
targets, the generic-board-config.sh script is used to check
requirements listed in board config fragments against a reference config
in order to determine which board config fragments to merge into the
final config.

When specifying O= to configure in a directory other than the kernel
source directory, this generic-board-config.sh script is invoked in the
directory that we are configuring in (ie. the directory that O equals),
and the path to the reference config is relative to the current
directory. The script then changes the current directory to the source
tree, which unfortunately breaks later access to the reference file
since its path is relative to a directory that is no longer the current
working directory. This results in configuration failing with errors
such as:

  $ make ARCH=mips O=tmp 32r2_defconfig
  make[1]: Entering directory '/home/pburton/src/linux/tmp'
  Using ../arch/mips/configs/generic_defconfig as base
  Merging ../arch/mips/configs/generic/32r2.config
  Merging ../arch/mips/configs/generic/eb.config
  grep: ./.config.32r2_defconfig: No such file or directory
  grep: ./.config.32r2_defconfig: No such file or directory
  The base file '.config' does not exist.  Exit.
  make[1]: *** [arch/mips/Makefile:505: 32r2_defconfig] Error 1
  make[1]: Leaving directory '/home/pburton/src/linux-ingenic/tmp'
  make: *** [Makefile:145: sub-make] Error 2

Fix this by avoiding changing the working directory in
generic-board-config.sh, instead using full paths to files under
$(srctree)/ where necessary.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Fixes: 27e0d4b051 ("MIPS: generic: Allow filtering enabled boards by requirements")
Cc: linux-mips@linux-mips.org
Cc: kbuild test robot <fengguang.wu@intel.com>
Cc: kbuild-all@01.org
Patchwork: https://patchwork.linux-mips.org/patch/17231/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-10-09 16:32:34 +02:00
Paul Burton
133d68e0ed MIPS: Fix cmpxchg on 32b signed ints for 64b kernel with !kernel_uses_llsc 
Commit 8263db4d77 ("MIPS: cmpxchg: Implement __cmpxchg() as a
function") refactored our implementation of __cmpxchg() to be a function
rather than a macro, with the aim of making it easier to read & modify.
Unfortunately the commit breaks use of cmpxchg() for signed 32 bit
values when we have a 64 bit kernel with kernel_uses_llsc == false,
because:

 - In cmpxchg_local() we cast the old value to the type the pointer
   points to, and then to an unsigned long. If the pointer points to a
   signed type smaller than 64 bits then the old value will be sign
   extended to 64 bits. That is, bits beyond the size of the pointed to
   type will be set to 1 if the old value is negative. In the case of a
   signed 32 bit integer with a negative value, bits 63:32 will all be
   set.

 - In __cmpxchg_asm() we load the value from memory, ie. dereference the
   pointer, and store the value as an unsigned integer (__ret) whose
   size matches the pointer. For a 32 bit cmpxchg() this means we store
   the value in a u32, because the pointer provided to __cmpxchg_asm()
   by __cmpxchg() is of type volatile u32 *.

 - __cmpxchg_asm() then checks whether the value in memory (__ret)
   matches the provided old value, by comparing the two values. This
   results in the u32 being promoted to a 64 bit unsigned long to match
   the old argument - however because both types are unsigned the value
   is zero extended, which does not match the sign extension performed
   on the old value in cmpxchg_local() earlier.

This mismatch means that unfortunate cmpxchg() calls can incorrectly
fail for 64 bit kernels with kernel_uses_llsc == false. This is the case
on at least non-SMP Cavium Octeon kernels, which hardcode
kernel_uses_llsc in their cpu-feature-overrides.h header. Using a
v4.13-rc7 kernel configured using cavium_octeon_defconfig with SMP
manually disabled, this presents itself as oddity when we reach
userland - for example:

  can't run '/bin/mount': Text file busy
  can't run '/bin/mkdir': Text file busy
  can't run '/bin/mkdir': Text file busy
  can't run '/bin/mount': Text file busy
  can't run '/bin/hostname': Text file busy
  can't run '/etc/init.d/rcS': Text file busy
  can't run '/sbin/getty': Text file busy
  can't run '/sbin/getty': Text file busy

It appears that some part of the init process, which is in this case
buildroot's busybox init, is running successfully. It never manages to
reach the login prompt though, and complains about /sbin/getty being
busy repeatedly and indefinitely.

Fix this by casting the old value provided to __cmpxchg_asm() to an
appropriately sized unsigned integer, such that we consistently
zero-extend avoiding the mismatch. The __cmpxchg_small() case for 8 & 16
bit values is unaffected because __cmpxchg_small() already masks
provided values appropriately.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Fixes: 8263db4d77 ("MIPS: cmpxchg: Implement __cmpxchg() as a function")
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17226/
Cc: linux-mips@linux-mips.org
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-10-09 16:31:32 +02:00
Kelvin Cheung
1b6ad6df8b MIPS: loongson1: set default number of rx and tx queues for stmmac 
Set the default number of RX and TX queues due to
the recent changes of stmmac driver.
Otherwise the ethernet will crash once it starts.

Signed-off-by: Kelvin Cheung <keguang.zhang@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17452/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-10-09 14:53:38 +02:00
Matt Redfearn
94c3390ab8 MIPS: bpf: Fix uninitialised target compiler error 
Compiling ebpf_jit.c with gcc 4.9 results in a (likely spurious)
compiler warning, as gcc has detected that the variable "target" may be
used uninitialised. Since -Werror is active, this is treated as an error
and causes a kernel build failure whenever CONFIG_MIPS_EBPF_JIT is
enabled.

arch/mips/net/ebpf_jit.c: In function 'build_one_insn':
arch/mips/net/ebpf_jit.c:1118:80: error: 'target' may be used
uninitialized in this function [-Werror=maybe-uninitialized]
    emit_instr(ctx, j, target);
                                                                                ^
cc1: all warnings being treated as errors

Fix this by initialising "target" to 0. If it really is used
uninitialised this would result in a jump to 0 and a detectable run time
failure.

Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Fixes: b6bd53f9c4 ("MIPS: Add missing file for eBPF JIT.")
Cc: James Hogan <james.hogan@imgtec.com>
Cc: David Daney <david.daney@cavium.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Colin Ian King <colin.king@canonical.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: <stable@vger.kernel.org> # v4.13+
Patchwork: https://patchwork.linux-mips.org/patch/17375/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-10-09 14:53:38 +02:00
Linus Torvalds
e2577d2293 pci-v4.14-fixes-2 
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Merge tag 'pci-v4.14-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci

Pull PCI fixes from Bjorn Helgaas:

 - fix endpoint "end of test" interrupt issue (introduced in v4.14-rc1)
   (John Keeping)

 - fix MIPS use-after-free map_irq() issue (introduced in v4.14-rc1)
   (Lorenzo Pieralisi)

* tag 'pci-v4.14-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
  PCI: endpoint: Use correct "end of test" interrupt
  MIPS: PCI: Move map_irq() hooks out of initdata
 2017-09-22 13:09:11 -10:00
Manuel Lauss
8eba3651f1 MIPS: PCI: fix pcibios_map_irq section mismatch 
Drop  the __init from pcibios_map_irq() to make this section mis-
match go away:

WARNING: vmlinux.o(.text+0x56acd4): Section mismatch in reference from the function pcibios_scanbus() to the function .init.text:pcibios_map_irq()
The function pcibios_scanbus() references
the function __init pcibios_map_irq().
This is often because pcibios_scanbus lacks a __init
annotation or the annotation of pcibios_map_irq is wrong.

Run-Tested only on Alchemy.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17267/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-09-21 16:41:20 +02:00
James Hogan
c22c804310 MIPS: Fix input modify in __write_64bit_c0_split() 
The inline asm in __write_64bit_c0_split() modifies the 64-bit input
operand by shifting the high register left by 32, and constructing the
full 64-bit value in the low register (even on a 32-bit kernel), so if
that value is used again it could cause breakage as GCC would assume the
registers haven't changed when they have.

To quote the GCC extended asm documentation:
> Warning: Do not modify the contents of input-only operands (except for
> inputs tied to outputs). The compiler assumes that on exit from the
> asm statement these operands contain the same values as they had
> before executing the statement.

Avoid modifying the input by using a temporary variable as an output
which is modified instead of the input and not otherwise used. The asm
is always __volatile__ so GCC shouldn't optimise it out. The low
register of the temporary output is written before the high register of
the input is read, so we have two constraint alternatives, one where
both use the same registers (for when the input value isn't subsequently
used), and one with an early clobber on the output in case the low
output uses the same register as the high input. This allows the
resulting assembly to remain mostly unchanged.

A diff of a MIPS32r6 kernel reveals only three differences, two in
relation to write_c0_r10k_diag() in cpu_probe() (register allocation
rearranged slightly but otherwise identical), and one in relation to
write_c0_cvmmemctl2() in kvm_vz_local_flush_guesttlb_all(), but the
octeon CPU is only supported on 64-bit kernels where
__write_64bit_c0_split() isn't used so that shouldn't matter in
practice. So there currently doesn't appear to be anything broken by
this bug.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17315/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-09-21 16:26:42 +02:00
Arnd Bergmann
9bbe7dc05c MIPS: MSP71xx: Include asm/setup.h 
msp71xx_defconfig can not be built at the in v4.14-rc1

arch/mips/pmcs-msp71xx/msp_smp.c:72:2: error: implicit declaration of function 'set_vi_handler' [-Werror=implicit-function-declaration]

I don't know what caused the regression, but including the right
header is the obvious fix.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/17309/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-09-21 16:15:17 +02:00
Paul Burton
fd0b19ed53 MIPS: Fix perf event init 
Commit c311c79799 ("cpumask: make "nr_cpumask_bits" unsigned")
modified mipspmu_event_init() to cast the struct perf_event cpu field to
an unsigned integer before it is compared with nr_cpumask_bits (and
*ahem* did so without copying the linux-mips mailing list or any MIPS
developers...). This is broken because the cpu field may be -1 for
events which follow a process rather than being affine to a particular
CPU. When this is the case the cast to an unsigned int results in a
value equal to ULONG_MAX, which is always greater than nr_cpumask_bits
so we always fail mipspmu_event_init() and return -ENODEV.

The check against nr_cpumask_bits seems nonsensical anyway, so this
patch simply removes it. The cpu field is going to either be -1 or a
valid CPU number. Comparing it with nr_cpumask_bits is effectively
checking that it's a valid cpu number, but it seems safe to rely on the
core perf events code to ensure that's the case.

The end result is that this fixes use of perf on MIPS when not
constraining events to a particular CPU, and fixes the "perf list hw"
command which fails to list any events without this.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Fixes: c311c79799 ("cpumask: make "nr_cpumask_bits" unsigned")
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mips@linux-mips.org
Cc: stable <stable@vger.kernel.org> # v4.12+
Patchwork: https://patchwork.linux-mips.org/patch/17323/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-09-20 10:47:12 +02:00
Lorenzo Pieralisi
19a8d6b760 MIPS: PCI: Move map_irq() hooks out of initdata 
04c81c7293 ("MIPS: PCI: Replace pci_fixup_irqs() call with host bridge
IRQ mapping hooks") moved the PCI IRQ fixup to the new host bridge
map/swizzle_irq() hooks mechanism. Those hooks can also be called after
boot, when all the __init/__initdata/__initconst sections have been freed.
Therefore, functions called by them (and the data they refer to) must not
be marked as __init/__initdata/__initconst lest compilation trigger section
mismatch warnings.

Fix all the board files map_irq() hooks by simply removing the respective
__init/__initdata/__initconst section markers and by adding another
persistent hook IRQ map for the txx9 board files.

Fixes: 04c81c7293 ("MIPS: PCI: Replace pci_fixup_irqs() call with host bridge IRQ mapping hooks")
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Steve French <smfrench@gmail.com>
 2017-09-19 14:55:26 -05:00
Linus Torvalds
7318413077 Merge branch '4.14-features' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 
Pull MIPS updates from Ralf Baechle:
 "This is the main pull request for 4.14 for MIPS; below a summary of
  the non-merge commits:

  CM:
   - Rename mips_cm_base to mips_gcr_base
   - Specify register size when generating accessors
   - Use BIT/GENMASK for register fields, order & drop shifts
   - Add cluster & block args to mips_cm_lock_other()

  CPC:
   - Use common CPS accessor generation macros
   - Use BIT/GENMASK for register fields, order & drop shifts
   - Introduce register modify (set/clear/change) accessors
   - Use change_*, set_* & clear_* where appropriate
   - Add CM/CPC 3.5 register definitions
   - Use GlobalNumber macros rather than magic numbers
   - Have asm/mips-cps.h include CM & CPC headers
   - Cluster support for topology functions
   - Detect CPUs in secondary clusters

  CPS:
   - Read GIC_VL_IDENT directly, not via irqchip driver

  DMA:
   - Consolidate coherent and non-coherent dma_alloc code
   - Don't use dma_cache_sync to implement fd_cacheflush

  FPU emulation / FP assist code:
   - Another series of 14 commits fixing corner cases such as NaN
     propgagation and other special input values.
   - Zero bits 32-63 of the result for a CLASS.D instruction.
   - Enhanced statics via debugfs
   - Do not use bools for arithmetic. GCC 7.1 moans about this.
   - Correct user fault_addr type

  Generic MIPS:
   - Enhancement of stack backtraces
   - Cleanup from non-existing options
   - Handle non word sized instructions when examining frame
   - Fix detection and decoding of ADDIUSP instruction
   - Fix decoding of SWSP16 instruction
   - Refactor handling of stack pointer in get_frame_info
   - Remove unreachable code from force_fcr31_sig()
   - Convert to using %pOF instead of full_name
   - Remove the R6000 support.
   - Move FP code from *_switch.S to *_fpu.S
   - Remove unused ST_OFF from r2300_switch.S
   - Allow platform to specify multiple its.S files
   - Add #includes to various files to ensure code builds reliable and
     without warning..
   - Remove __invalidate_kernel_vmap_range
   - Remove plat_timer_setup
   - Declare various variables & functions static
   - Abstract CPU core & VP(E) ID access through accessor functions
   - Store core & VP IDs in GlobalNumber-style variable
   - Unify checks for sibling CPUs
   - Add CPU cluster number accessors
   - Prevent direct use of generic_defconfig
   - Make CONFIG_MIPS_MT_SMP default y
   - Add __ioread64_copy
   - Remove unnecessary inclusions of linux/irqchip/mips-gic.h

  GIC:
   - Introduce asm/mips-gic.h with accessor functions
   - Use new GIC accessor functions in mips-gic-timer
   - Remove counter access functions from irq-mips-gic.c
   - Remove gic_read_local_vp_id() from irq-mips-gic.c
   - Simplify shared interrupt pending/mask reads in irq-mips-gic.c
   - Simplify gic_local_irq_domain_map() in irq-mips-gic.c
   - Drop gic_(re)set_mask() functions in irq-mips-gic.c
   - Remove gic_set_polarity(), gic_set_trigger(), gic_set_dual_edge(),
     gic_map_to_pin() and gic_map_to_vpe() from irq-mips-gic.c.
   - Convert remaining shared reg access, local int mask access and
     remaining local reg access to new accessors
   - Move GIC_LOCAL_INT_* to asm/mips-gic.h
   - Remove GIC_CPU_INT* macros from irq-mips-gic.c
   - Move various definitions to the driver
   - Remove gic_get_usm_range()
   - Remove __gic_irq_dispatch() forward declaration
   - Remove gic_init()
   - Use mips_gic_present() in place of gic_present and remove
     gic_present
   - Move gic_get_c0_*_int() to asm/mips-gic.h
   - Remove linux/irqchip/mips-gic.h
   - Inline __gic_init()
   - Inline gic_basic_init()
   - Make pcpu_masks a per-cpu variable
   - Use pcpu_masks to avoid reading GIC_SH_MASK*
   - Clean up mti, reserved-cpu-vectors handling
   - Use cpumask_first_and() in gic_set_affinity()
   - Let the core set struct irq_common_data affinity

  microMIPS:
   - Fix microMIPS stack unwinding on big endian systems

  MIPS-GIC:
   - SYNC after enabling GIC region

  NUMA:
   - Remove the unused parent_node() macro

  R6:
   - Constify r2_decoder_tables
   - Add accessor & bit definitions for GlobalNumber

  SMP:
   - Constify smp ops
   - Allow boot_secondary SMP op to return errors

  VDSO:
   - Drop gic_get_usm_range() usage
   - Avoid use of linux/irqchip/mips-gic.h

  Platform changes:

  Alchemy:
   - Add devboard machine type to cpuinfo
   - update cpu feature overrides
   - Threaded carddetect irqs for devboards

  AR7:
   - allow NULL clock for clk_get_rate

  BCM63xx:
   - Fix ENETDMA_6345_MAXBURST_REG offset
   - Allow NULL clock for clk_get_rate

  CI20:
   - Enable GPIO and RTC drivers in defconfig
   - Add ethernet and fixed-regulator nodes to DTS

  Generic platform:
   - Move Boston and NI 169445 FIT image source to their own files
   - Include asm/bootinfo.h for plat_fdt_relocated()
   - Include asm/time.h for get_c0_*_int()
   - Include asm/bootinfo.h for plat_fdt_relocated()
   - Include asm/time.h for get_c0_*_int()
   - Allow filtering enabled boards by requirements
   - Don't explicitly disable CONFIG_USB_SUPPORT
   - Bump default NR_CPUS to 16

  JZ4700:
   - Probe the jz4740-rtc driver from devicetree

  Lantiq:
   - Drop check of boot select from the spi-falcon driver.
   - Drop check of boot select from the lantiq-flash MTD driver.
   - Access boot cause register in the watchdog driver through regmap
   - Add device tree binding documentation for the watchdog driver
   - Add docs for the RCU DT bindings.
   - Convert the fpi bus driver to a platform_driver
   - Remove ltq_reset_cause() and ltq_boot_select(
   - Switch to a proper reset driver
   - Switch to a new drivers/soc GPHY driver
   - Add an USB PHY driver for the Lantiq SoCs using the RCU module
   - Use of_platform_default_populate instead of __dt_register_buses
   - Enable MFD_SYSCON to be able to use it for the RCU MFD
   - Replace ltq_boot_select() with dummy implementation.

  Loongson 2F:
   - Allow NULL clock for clk_get_rate

  Malta:
   - Use new GIC accessor functions

  NI 169445:
   - Add support for NI 169445 board.
   - Only include in 32r2el kernels

  Octeon:
   - Add support for watchdog of 78XX SOCs.
   - Add support for watchdog of CN68XX SOCs.
   - Expose support for mips32r1, mips32r2 and mips64r1
   - Enable more drivers in config file
   - Add support for accessing the boot vector.
   - Remove old boot vector code from watchdog driver
   - Define watchdog registers for 70xx, 73xx, 78xx, F75xx.
   - Make CSR functions node aware.
   - Allow access to CIU3 IRQ domains.
   - Misc cleanups in the watchdog driver

  Omega2+:
   - New board, add support and defconfig

  Pistachio:
   - Enable Root FS on NFS in defconfig

  Ralink:
   - Add Mediatek MT7628A SoC
   - Allow NULL clock for clk_get_rate
   - Explicitly request exclusive reset control in the pci-mt7620 PCI driver.

  SEAD3:
   - Only include in 32 bit kernels by default

  VoCore:
   - Add VoCore as a vendor t0 dt-bindings
   - Add defconfig file"

* '4.14-features' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus: (167 commits)
  MIPS: Refactor handling of stack pointer in get_frame_info
  MIPS: Stacktrace: Fix microMIPS stack unwinding on big endian systems
  MIPS: microMIPS: Fix decoding of swsp16 instruction
  MIPS: microMIPS: Fix decoding of addiusp instruction
  MIPS: microMIPS: Fix detection of addiusp instruction
  MIPS: Handle non word sized instructions when examining frame
  MIPS: ralink: allow NULL clock for clk_get_rate
  MIPS: Loongson 2F: allow NULL clock for clk_get_rate
  MIPS: BCM63XX: allow NULL clock for clk_get_rate
  MIPS: AR7: allow NULL clock for clk_get_rate
  MIPS: BCM63XX: fix ENETDMA_6345_MAXBURST_REG offset
  mips: Save all registers when saving the frame
  MIPS: Add DWARF unwinding to assembly
  MIPS: Make SAVE_SOME more standard
  MIPS: Fix issues in backtraces
  MIPS: jz4780: DTS: Probe the jz4740-rtc driver from devicetree
  MIPS: Ci20: Enable RTC driver
  watchdog: octeon-wdt: Add support for 78XX SOCs.
  watchdog: octeon-wdt: Add support for cn68XX SOCs.
  watchdog: octeon-wdt: File cleaning.
  ...
 2017-09-15 20:43:33 -07:00
Linus Torvalds
9db59599ae * PPC bugfixes 
* RCU splat fix
 * swait races fix
 * pointless userspace-triggerable BUG() fix
 * misc fixes for KVM_RUN corner cases
 * nested virt correctness fixes + one host DoS
 * some cleanups
 * clang build fix
 * fix AMD AVIC with default QEMU command line options
 * x86 bugfixes
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull more KVM updates from Paolo Bonzini:
 - PPC bugfixes
 - RCU splat fix
 - swait races fix
 - pointless userspace-triggerable BUG() fix
 - misc fixes for KVM_RUN corner cases
 - nested virt correctness fixes + one host DoS
 - some cleanups
 - clang build fix
 - fix AMD AVIC with default QEMU command line options
 - x86 bugfixes

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (28 commits)
  kvm: nVMX: Handle deferred early VMLAUNCH/VMRESUME failure properly
  kvm: vmx: Handle VMLAUNCH/VMRESUME failure properly
  kvm: nVMX: Remove nested_vmx_succeed after successful VM-entry
  kvm,mips: Fix potential swait_active() races
  kvm,powerpc: Serialize wq active checks in ops->vcpu_kick
  kvm: Serialize wq active checks in kvm_vcpu_wake_up()
  kvm,x86: Fix apf_task_wake_one() wq serialization
  kvm,lapic: Justify use of swait_active()
  kvm,async_pf: Use swq_has_sleeper()
  sched/wait: Add swq_has_sleeper()
  KVM: VMX: Do not BUG() on out-of-bounds guest IRQ
  KVM: Don't accept obviously wrong gsi values via KVM_IRQFD
  kvm: nVMX: Don't allow L2 to access the hardware CR8
  KVM: trace events: update list of exit reasons
  KVM: async_pf: Fix #DF due to inject "Page not Present" and "Page Ready" exceptions simultaneously
  KVM: X86: Don't block vCPU if there is pending exception
  KVM: SVM: Add irqchip_split() checks before enabling AVIC
  KVM: Add struct kvm_vcpu pointer parameter to get_enable_apicv()
  KVM: SVM: Refactor AVIC vcpu initialization into avic_init_vcpu()
  KVM: x86: fix clang build
  ...
 2017-09-15 15:43:55 -07:00
Davidlohr Bueso
4c0b4bc60f kvm,mips: Fix potential swait_active() races 
For example, the following could occur, making us miss a wakeup:

CPU0					CPU1
kvm_vcpu_block				kvm_mips_comparecount_func
					  [L] swait_active(&vcpu->wq)
  [S] prepare_to_swait(&vcpu->wq)
  [L] if (!kvm_vcpu_has_pending_timer(vcpu))
         schedule()                       [S] queue_timer_int(vcpu)

Ensure that the swait_active() check is not hoisted over the interrupt.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
 2017-09-15 16:57:13 +02:00
Linus Torvalds
581bfce969 Merge branch 'work.set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 
Pull more set_fs removal from Al Viro:
 "Christoph's 'use kernel_read and friends rather than open-coding
  set_fs()' series"

* 'work.set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  fs: unexport vfs_readv and vfs_writev
  fs: unexport vfs_read and vfs_write
  fs: unexport __vfs_read/__vfs_write
  lustre: switch to kernel_write
  gadget/f_mass_storage: stop messing with the address limit
  mconsole: switch to kernel_read
  btrfs: switch write_buf to kernel_write
  net/9p: switch p9_fd_read to kernel_write
  mm/nommu: switch do_mmap_private to kernel_read
  serial2002: switch serial2002_tty_write to kernel_{read/write}
  fs: make the buf argument to __kernel_write a void pointer
  fs: fix kernel_write prototype
  fs: fix kernel_read prototype
  fs: move kernel_read to fs/read_write.c
  fs: move kernel_write to fs/read_write.c
  autofs4: switch autofs4_write to __kernel_write
  ashmem: switch to ->read_iter
 2017-09-14 18:13:32 -07:00
Linus Torvalds
dd198ce714 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 
Pull namespace updates from Eric Biederman:
 "Life has been busy and I have not gotten half as much done this round
  as I would have liked. I delayed it so that a minor conflict
  resolution with the mips tree could spend a little time in linux-next
  before I sent this pull request.

  This includes two long delayed user namespace changes from Kirill
  Tkhai. It also includes a very useful change from Serge Hallyn that
  allows the security capability attribute to be used inside of user
  namespaces. The practical effect of this is people can now untar
  tarballs and install rpms in user namespaces. It had been suggested to
  generalize this and encode some of the namespace information
  information in the xattr name. Upon close inspection that makes the
  things that should be hard easy and the things that should be easy
  more expensive.

  Then there is my bugfix/cleanup for signal injection that removes the
  magic encoding of the siginfo union member from the kernel internal
  si_code. The mips folks reported the case where I had used FPE_FIXME
  me is impossible so I have remove FPE_FIXME from mips, while at the
  same time including a return statement in that case to keep gcc from
  complaining about unitialized variables.

  I almost finished the work to get make copy_siginfo_to_user a trivial
  copy to user. The code is available at:

     git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git neuter-copy_siginfo_to_user-v3

  But I did not have time/energy to get the code posted and reviewed
  before the merge window opened.

  I was able to see that the security excuse for just copying fields
  that we know are initialized doesn't work in practice there are buggy
  initializations that don't initialize the proper fields in siginfo. So
  we still sometimes copy unitialized data to userspace"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
  Introduce v3 namespaced file capabilities
  mips/signal: In force_fcr31_sig return in the impossible case
  signal: Remove kernel interal si_code magic
  fcntl: Don't use ambiguous SIG_POLL si_codes
  prctl: Allow local CAP_SYS_ADMIN changing exe_file
  security: Use user_namespace::level to avoid redundant iterations in cap_capable()
  userns,pidns: Verify the userns for new pid namespaces
  signal/testing: Don't look for __SI_FAULT in userspace
  signal/mips: Document a conflict with SI_USER with SIGFPE
  signal/sparc: Document a conflict with SI_USER with SIGFPE
  signal/ia64: Document a conflict with SI_USER with SIGFPE
  signal/alpha: Document a conflict with SI_USER for SIGTRAP
 2017-09-11 18:34:47 -07:00
Linus Torvalds
a59e57da49 MTD changes for 4.14: 
General updates:
  * Constify pci_device_id in various drivers
  * Constify device_type
  * Remove pad control code from the Gemini driver
  * Use %pOF to print OF node full_name
  * Various fixes in the physmap_of driver
  * Remove unused vars in mtdswap
  * Check devm_kzalloc() return value in the spear_smi driver
  * Check clk_prepare_enable() return code in the st_spi_fsm driver
  * Create per MTD device debugfs enties
 
 NAND updates, from Boris Brezillon:
  * Fix memory leaks in the core
  * Remove unused NAND locking support
  * Rename nand.h into rawnand.h (preparing support for spi NANDs)
  * Use NAND_MAX_ID_LEN where appropriate
  * Fix support for 20nm Hynix chips
  * Fix support for Samsung and Hynix SLC NANDs
  * Various cleanup, improvements and fixes in the qcom driver
  * Fixes for bugs detected by various static code analysis tools
  * Fix mxc ooblayout definition
  * Add a new part_parsers to tmio and sharpsl platform data in order to
    define a custom list of partition parsers
  * Request the reset line in exclusive mode in the sunxi driver
  * Fix a build error in the orion-nand driver when compiled for ARMv4
  * Allow 64-bit mvebu platforms to select the PXA3XX driver
 
 SPI NOR updates, from Cyrille Pitchen and Marek Vasut:
  * add support to the JEDEC JESD216B specification (SFDP tables).
  * add support to the Intel Denverton SPI flash controller.
  * fix error recovery for Spansion/Cypress SPI NOR memories.
  * fix 4-byte address management for the Aspeed SPI controller.
  * add support to some Microchip SST26 memory parts
  * remove unneeded pinctrl header Write a message for tag:
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Merge tag 'for-linus-20170904' of git://git.infradead.org/linux-mtd

Pull MTD updates from Boris Brezillon:
 "General updates:
   - Constify pci_device_id in various drivers
   - Constify device_type
   - Remove pad control code from the Gemini driver
   - Use %pOF to print OF node full_name
   - Various fixes in the physmap_of driver
   - Remove unused vars in mtdswap
   - Check devm_kzalloc() return value in the spear_smi driver
   - Check clk_prepare_enable() return code in the st_spi_fsm driver
   - Create per MTD device debugfs enties

  NAND updates, from Boris Brezillon:
   - Fix memory leaks in the core
   - Remove unused NAND locking support
   - Rename nand.h into rawnand.h (preparing support for spi NANDs)
   - Use NAND_MAX_ID_LEN where appropriate
   - Fix support for 20nm Hynix chips
   - Fix support for Samsung and Hynix SLC NANDs
   - Various cleanup, improvements and fixes in the qcom driver
   - Fixes for bugs detected by various static code analysis tools
   - Fix mxc ooblayout definition
   - Add a new part_parsers to tmio and sharpsl platform data in order
     to define a custom list of partition parsers
   - Request the reset line in exclusive mode in the sunxi driver
   - Fix a build error in the orion-nand driver when compiled for ARMv4
   - Allow 64-bit mvebu platforms to select the PXA3XX driver

  SPI NOR updates, from Cyrille Pitchen and Marek Vasut:
   - add support to the JEDEC JESD216B specification (SFDP tables).
   - add support to the Intel Denverton SPI flash controller.
   - fix error recovery for Spansion/Cypress SPI NOR memories.
   - fix 4-byte address management for the Aspeed SPI controller.
   - add support to some Microchip SST26 memory parts
   - remove unneeded pinctrl header Write a message for tag:"

* tag 'for-linus-20170904' of git://git.infradead.org/linux-mtd: (74 commits)
  mtd: nand: complain loudly when chip->bits_per_cell is not correctly initialized
  mtd: nand: make Samsung SLC NAND usable again
  mtd: nand: tmio: Register partitions using the parsers
  mfd: tmio: Add partition parsers platform data
  mtd: nand: sharpsl: Register partitions using the parsers
  mtd: nand: sharpsl: Add partition parsers platform data
  mtd: nand: qcom: Support for IPQ8074 QPIC NAND controller
  mtd: nand: qcom: support for IPQ4019 QPIC NAND controller
  dt-bindings: qcom_nandc: IPQ8074 QPIC NAND documentation
  dt-bindings: qcom_nandc: IPQ4019 QPIC NAND documentation
  dt-bindings: qcom_nandc: fix the ipq806x device tree example
  mtd: nand: qcom: support for different DEV_CMD register offsets
  mtd: nand: qcom: QPIC data descriptors handling
  mtd: nand: qcom: enable BAM or ADM mode
  mtd: nand: qcom: erased codeword detection configuration
  mtd: nand: qcom: support for read location registers
  mtd: nand: qcom: support for passing flags in DMA helper functions
  mtd: nand: qcom: add BAM DMA descriptor handling
  mtd: nand: qcom: allocate BAM transaction
  mtd: nand: qcom: DMA mapping support for register read buffer
  ...
 2017-09-09 14:48:21 -07:00
Linus Torvalds
fbf4432ff7 Merge branch 'akpm' (patches from Andrew) 
Merge more updates from Andrew Morton:

 - most of the rest of MM

 - a small number of misc things

 - lib/ updates

 - checkpatch

 - autofs updates

 - ipc/ updates

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (126 commits)
  ipc: optimize semget/shmget/msgget for lots of keys
  ipc/sem: play nicer with large nsops allocations
  ipc/sem: drop sem_checkid helper
  ipc: convert kern_ipc_perm.refcount from atomic_t to refcount_t
  ipc: convert sem_undo_list.refcnt from atomic_t to refcount_t
  ipc: convert ipc_namespace.count from atomic_t to refcount_t
  kcov: support compat processes
  sh: defconfig: cleanup from old Kconfig options
  mn10300: defconfig: cleanup from old Kconfig options
  m32r: defconfig: cleanup from old Kconfig options
  drivers/pps: use surrounding "if PPS" to remove numerous dependency checks
  drivers/pps: aesthetic tweaks to PPS-related content
  cpumask: make cpumask_next() out-of-line
  kmod: move #ifdef CONFIG_MODULES wrapper to Makefile
  kmod: split off umh headers into its own file
  MAINTAINERS: clarify kmod is just a kernel module loader
  kmod: split out umh code into its own file
  test_kmod: flip INT checks to be consistent
  test_kmod: remove paranoid UINT_MAX check on uint range processing
  vfat: deduplicate hex2bin()
  ...
 2017-09-09 10:30:07 -07:00
Matthew Wilcox
ac036f9570 vga: optimise console scrolling 
Where possible, call memset16(), memmove() or memcpy() instead of using
open-coded loops.  I don't like the calling convention that uses a byte
count instead of a count of u16s, but it's a little late to change that.
Reduces code size of fbcon.o by almost 400 bytes on my laptop build.

[akpm@linux-foundation.org: fix build]
Link: http://lkml.kernel.org/r/20170720184539.31609-9-willy@infradead.org
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: David Miller <davem@davemloft.net>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: "James E.J. Bottomley" <jejb@linux.vnet.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2017-09-08 18:26:48 -07:00
Linus Torvalds
0d519f2d1e pci-v4.14-changes 
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Merge tag 'pci-v4.14-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci

Pull PCI updates from Bjorn Helgaas:

 - add enhanced Downstream Port Containment support, which prints more
   details about Root Port Programmed I/O errors (Dongdong Liu)

 - add Layerscape ls1088a and ls2088a support (Hou Zhiqiang)

 - add MediaTek MT2712 and MT7622 support (Ryder Lee)

 - add MediaTek MT2712 and MT7622 MSI support (Honghui Zhang)

 - add Qualcom IPQ8074 support (Varadarajan Narayanan)

 - add R-Car r8a7743/5 device tree support (Biju Das)

 - add Rockchip per-lane PHY support for better power management (Shawn
   Lin)

 - fix IRQ mapping for hot-added devices by replacing the
   pci_fixup_irqs() boot-time design with a host bridge hook called at
   probe-time (Lorenzo Pieralisi, Matthew Minter)

 - fix race when enabling two devices that results in upstream bridge
   not being enabled correctly (Srinath Mannam)

 - fix pciehp power fault infinite loop (Keith Busch)

 - fix SHPC bridge MSI hotplug events by enabling bus mastering
   (Aleksandr Bezzubikov)

 - fix a VFIO issue by correcting PCIe capability sizes (Alex
   Williamson)

 - fix an INTD issue on Xilinx and possibly other drivers by unifying
   INTx IRQ domain support (Paul Burton)

 - avoid IOMMU stalls by marking AMD Stoney GPU ATS as broken (Joerg
   Roedel)

 - allow APM X-Gene device assignment to guests by adding an ACS quirk
   (Feng Kan)

 - fix driver crashes by disabling Extended Tags on Broadcom HT2100
   (Extended Tags support is required for PCIe Receivers but not
   Requesters, and we now enable them by default when Requesters support
   them) (Sinan Kaya)

 - fix MSIs for devices that use phantom RIDs for DMA by assuming MSIs
   use the real Requester ID (not a phantom RID) (Robin Murphy)

 - prevent assignment of Intel VMD children to guests (which may be
   supported eventually, but isn't yet) by not associating an IOMMU with
   them (Jon Derrick)

 - fix Intel VMD suspend/resume by releasing IRQs on suspend (Scott
   Bauer)

 - fix a Function-Level Reset issue with Intel 750 NVMe by waiting
   longer (up to 60sec instead of 1sec) for device to become ready
   (Sinan Kaya)

 - fix a Function-Level Reset issue on iProc Stingray by working around
   hardware defects in the CRS implementation (Oza Pawandeep)

 - fix an issue with Intel NVMe P3700 after an iProc reset by adding a
   delay during shutdown (Oza Pawandeep)

 - fix a Microsoft Hyper-V lockdep issue by polling instead of blocking
   in compose_msi_msg() (Stephen Hemminger)

 - fix a wireless LAN driver timeout by clearing DesignWare MSI
   interrupt status after it is handled, not before (Faiz Abbas)

 - fix DesignWare ATU enable checking (Jisheng Zhang)

 - reduce Layerscape dependencies on the bootloader by doing more
   initialization in the driver (Hou Zhiqiang)

 - improve Intel VMD performance allowing allocation of more IRQ vectors
   than present CPUs (Keith Busch)

 - improve endpoint framework support for initial DMA mask, different
   BAR sizes, configurable page sizes, MSI, test driver, etc (Kishon
   Vijay Abraham I, Stan Drozd)

 - rework CRS support to add periodic messages while we poll during
   enumeration and after Function-Level Reset and prepare for possible
   other uses of CRS (Sinan Kaya)

 - clean up Root Port AER handling by removing unnecessary code and
   moving error handler methods to struct pcie_port_service_driver
   (Christoph Hellwig)

 - clean up error handling paths in various drivers (Bjorn Andersson,
   Fabio Estevam, Gustavo A. R. Silva, Harunobu Kurokawa, Jeffy Chen,
   Lorenzo Pieralisi, Sergei Shtylyov)

 - clean up SR-IOV resource handling by disabling VF decoding before
   updating the corresponding resource structs (Gavin Shan)

 - clean up DesignWare-based drivers by unifying quirks to update Class
   Code and Interrupt Pin and related handling of write-protected
   registers (Hou Zhiqiang)

 - clean up by adding empty generic pcibios_align_resource() and
   pcibios_fixup_bus() and removing empty arch-specific implementations
   (Palmer Dabbelt)

 - request exclusive reset control for several drivers to allow cleanup
   elsewhere (Philipp Zabel)

 - constify various structures (Arvind Yadav, Bhumika Goyal)

 - convert from full_name() to %pOF (Rob Herring)

 - remove unused variables from iProc, HiSi, Altera, Keystone (Shawn
   Lin)

* tag 'pci-v4.14-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (170 commits)
  PCI: xgene: Clean up whitespace
  PCI: xgene: Define XGENE_PCI_EXP_CAP and use generic PCI_EXP_RTCTL offset
  PCI: xgene: Fix platform_get_irq() error handling
  PCI: xilinx-nwl: Fix platform_get_irq() error handling
  PCI: rockchip: Fix platform_get_irq() error handling
  PCI: altera: Fix platform_get_irq() error handling
  PCI: spear13xx: Fix platform_get_irq() error handling
  PCI: artpec6: Fix platform_get_irq() error handling
  PCI: armada8k: Fix platform_get_irq() error handling
  PCI: dra7xx: Fix platform_get_irq() error handling
  PCI: exynos: Fix platform_get_irq() error handling
  PCI: iproc: Clean up whitespace
  PCI: iproc: Rename PCI_EXP_CAP to IPROC_PCI_EXP_CAP
  PCI: iproc: Add 500ms delay during device shutdown
  PCI: Fix typos and whitespace errors
  PCI: Remove unused "res" variable from pci_resource_io()
  PCI: Correct kernel-doc of pci_vpd_srdt_size(), pci_vpd_srdt_tag()
  PCI/AER: Reformat AER register definitions
  iommu/vt-d: Prevent VMD child devices from being remapping targets
  x86/PCI: Use is_vmd() rather than relying on the domain number
  ...
 2017-09-08 15:47:43 -07:00
Linus Torvalds
0756b7fbb6 First batch of KVM changes for 4.14 
Common:
  - improve heuristic for boosting preempted spinlocks by ignoring VCPUs
    in user mode
 
 ARM:
  - fix for decoding external abort types from guests
 
  - added support for migrating the active priority of interrupts when
    running a GICv2 guest on a GICv3 host
 
  - minor cleanup
 
 PPC:
  - expose storage keys to userspace
 
  - merge powerpc/topic/ppc-kvm branch that contains
    find_linux_pte_or_hugepte and POWER9 thread management cleanup
 
  - merge kvm-ppc-fixes with a fix that missed 4.13 because of vacations
 
  - fixes
 
 s390:
  - merge of topic branch tlb-flushing from the s390 tree to get the
    no-dat base features
 
  - merge of kvm/master to avoid conflicts with additional sthyi fixes
 
  - wire up the no-dat enhancements in KVM
 
  - multiple epoch facility (z14 feature)
 
  - Configuration z/Architecture Mode
 
  - more sthyi fixes
 
  - gdb server range checking fix
 
  - small code cleanups
 
 x86:
  - emulate Hyper-V TSC frequency MSRs
 
  - add nested INVPCID
 
  - emulate EPTP switching VMFUNC
 
  - support Virtual GIF
 
  - support 5 level page tables
 
  - speedup nested VM exits by packing byte operations
 
  - speedup MMIO by using hardware provided physical address
 
  - a lot of fixes and cleanups, especially nested
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Merge tag 'kvm-4.14-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull KVM updates from Radim Krčmář:
 "First batch of KVM changes for 4.14

  Common:
   - improve heuristic for boosting preempted spinlocks by ignoring
     VCPUs in user mode

  ARM:
   - fix for decoding external abort types from guests

   - added support for migrating the active priority of interrupts when
     running a GICv2 guest on a GICv3 host

   - minor cleanup

  PPC:
   - expose storage keys to userspace

   - merge kvm-ppc-fixes with a fix that missed 4.13 because of
     vacations

   - fixes

  s390:
   - merge of kvm/master to avoid conflicts with additional sthyi fixes

   - wire up the no-dat enhancements in KVM

   - multiple epoch facility (z14 feature)

   - Configuration z/Architecture Mode

   - more sthyi fixes

   - gdb server range checking fix

   - small code cleanups

  x86:
   - emulate Hyper-V TSC frequency MSRs

   - add nested INVPCID

   - emulate EPTP switching VMFUNC

   - support Virtual GIF

   - support 5 level page tables

   - speedup nested VM exits by packing byte operations

   - speedup MMIO by using hardware provided physical address

   - a lot of fixes and cleanups, especially nested"

* tag 'kvm-4.14-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (67 commits)
  KVM: arm/arm64: Support uaccess of GICC_APRn
  KVM: arm/arm64: Extract GICv3 max APRn index calculation
  KVM: arm/arm64: vITS: Drop its_ite->lpi field
  KVM: arm/arm64: vgic: constify seq_operations and file_operations
  KVM: arm/arm64: Fix guest external abort matching
  KVM: PPC: Book3S HV: Fix memory leak in kvm_vm_ioctl_get_htab_fd
  KVM: s390: vsie: cleanup mcck reinjection
  KVM: s390: use WARN_ON_ONCE only for checking
  KVM: s390: guestdbg: fix range check
  KVM: PPC: Book3S HV: Report storage key support to userspace
  KVM: PPC: Book3S HV: Fix case where HDEC is treated as 32-bit on POWER9
  KVM: PPC: Book3S HV: Fix invalid use of register expression
  KVM: PPC: Book3S HV: Fix H_REGISTER_VPA VPA size validation
  KVM: PPC: Book3S HV: Fix setting of storage key in H_ENTER
  KVM: PPC: e500mc: Fix a NULL dereference
  KVM: PPC: e500: Fix some NULL dereferences on error
  KVM: PPC: Book3S HV: Protect updates to spapr_tce_tables list
  KVM: s390: we are always in czam mode
  KVM: s390: expose no-DAT to guest and migration support
  KVM: s390: sthyi: remove invalid guest write access
  ...
 2017-09-08 15:18:36 -07:00
Radim Krčmář
5f54c8b2d4 Merge branch 'kvm-ppc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 
This fix was intended for 4.13, but didn't get in because both
maintainers were on vacation.

Paul Mackerras:
 "It adds mutual exclusion between list_add_rcu and list_del_rcu calls
  on the kvm->arch.spapr_tce_tables list.  Without this, userspace could
  potentially trigger corruption of the list and cause a host crash or
  worse."
 2017-09-08 14:40:43 +02:00
Linus Torvalds
c0da4fa0d1 media updates for v4.14-rc1 
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Merge tag 'media/v4.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media

Pull media updates from Mauro Carvalho Chehab:
 "Brazil's Independence Day pull request :-)

  This is one of the biggest media pull requests, with 625 patches
  affecting almost all parts of media (RC, DVB, V4L2, CEC, docs).

  This contains:

   - A lot of new drivers:
     * DVB frontends: mxl5xx, stv0910, stv6111;
     * camera flash: as3645a led driver;
     * HDMI receiver: adv748X;
     * camera sensor: Omnivision 6650 5M driver (ov6650);
     * HDMI CEC: ao-cec meson driver;
     * V4L2: Qualcom camss driver;
     * Remote controller: gpio-ir-tx, pwm-ir-tx and zx-irdec drivers.

   - The DDbridge DVB driver got a massive update, with makes it in sync
     with modern hardware from that vendor;

   - There's an important milestone on this series: the DVB
     documentation was written in 2003, but only started to be updated
     in 2007. It also used to contain several gaps from the time it was
     kept out of tree, mentioning error codes and device nodes that
     never existed upstream. On this series, it received a massive
     update: all non-deprecated digital TV APIs are now in sync with the
     current implementation;

   - Some DVB APIs that aren't used by any upstream driver got removed;

   - Other parts of the media documentation algo got updated, fixing
     some bugs on its PDF output and making it compatible with Sphinx
     version 1.6.

     As the number of hacks required to build PDF output reduced, I hope
     we'll have less troubles as newer versions of our documentation
     toolchain are released (famous last words);

   - As usual, lots of driver cleanups and improvements"

* tag 'media/v4.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (624 commits)
  media: leds: as3645a: add V4L2_FLASH_LED_CLASS dependency
  media: get rid of removed DMX_GET_CAPS and DMX_SET_SOURCE leftovers
  media: Revert "[media] v4l: async: make v4l2 coexist with devicetree nodes in a dt overlay"
  media: staging: atomisp: sh_css_calloc shall return a pointer to the allocated space
  media: Revert "[media] lirc_dev: remove superfluous get/put_device() calls"
  media: add qcom_camss.rst to v4l-drivers rst file
  media: dvb headers: make checkpatch happier
  media: dvb uapi: move frontend legacy API to another part of the book
  media: pixfmt-srggb12p.rst: better format the table for PDF output
  media: docs-rst: media: Don't use \small for V4L2_PIX_FMT_SRGGB10 documentation
  media: index.rst: don't write "Contents:" on PDF output
  media: pixfmt*.rst: replace a two dots by a comma
  media: vidioc-g-fmt.rst: adjust table format
  media: vivid.rst: add a blank line to correct ReST format
  media: v4l2 uapi book: get rid of driver programming's chapter
  media: format.rst: use the right markup for important notes
  media: docs-rst: cardlists: change their format to flat-tables
  media: em28xx-cardlist.rst: update to reflect last changes
  media: v4l2-event.rst: adjust table to fit on PDF output
  media: docs: don't show ToC for each part on PDF output
  ...
 2017-09-07 12:53:14 -07:00
Linus Torvalds
d34fc1adf0 Merge branch 'akpm' (patches from Andrew) 
Merge updates from Andrew Morton:

 - various misc bits

 - DAX updates

 - OCFS2

 - most of MM

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (119 commits)
  mm,fork: introduce MADV_WIPEONFORK
  x86,mpx: make mpx depend on x86-64 to free up VMA flag
  mm: add /proc/pid/smaps_rollup
  mm: hugetlb: clear target sub-page last when clearing huge page
  mm: oom: let oom_reap_task and exit_mmap run concurrently
  swap: choose swap device according to numa node
  mm: replace TIF_MEMDIE checks by tsk_is_oom_victim
  mm, oom: do not rely on TIF_MEMDIE for memory reserves access
  z3fold: use per-cpu unbuddied lists
  mm, swap: don't use VMA based swap readahead if HDD is used as swap
  mm, swap: add sysfs interface for VMA based swap readahead
  mm, swap: VMA based swap readahead
  mm, swap: fix swap readahead marking
  mm, swap: add swap readahead hit statistics
  mm/vmalloc.c: don't reinvent the wheel but use existing llist API
  mm/vmstat.c: fix wrong comment
  selftests/memfd: add memfd_create hugetlbfs selftest
  mm/shmem: add hugetlbfs support to memfd_create()
  mm, devm_memremap_pages: use multi-order radix for ZONE_DEVICE lookups
  mm/vmalloc.c: halve the number of comparisons performed in pcpu_get_vm_areas()
  ...
 2017-09-06 20:49:49 -07:00
Rik van Riel
d2cd9ede6e mm,fork: introduce MADV_WIPEONFORK 
Introduce MADV_WIPEONFORK semantics, which result in a VMA being empty
in the child process after fork.  This differs from MADV_DONTFORK in one
important way.

If a child process accesses memory that was MADV_WIPEONFORK, it will get
zeroes.  The address ranges are still valid, they are just empty.

If a child process accesses memory that was MADV_DONTFORK, it will get a
segmentation fault, since those address ranges are no longer valid in
the child after fork.

Since MADV_DONTFORK also seems to be used to allow very large programs
to fork in systems with strict memory overcommit restrictions, changing
the semantics of MADV_DONTFORK might break existing programs.

MADV_WIPEONFORK only works on private, anonymous VMAs.

The use case is libraries that store or cache information, and want to
know that they need to regenerate it in the child process after fork.

Examples of this would be:
 - systemd/pulseaudio API checks (fail after fork) (replacing a getpid
   check, which is too slow without a PID cache)
 - PKCS#11 API reinitialization check (mandated by specification)
 - glibc's upcoming PRNG (reseed after fork)
 - OpenSSL PRNG (reseed after fork)

The security benefits of a forking server having a re-inialized PRNG in
every child process are pretty obvious.  However, due to libraries
having all kinds of internal state, and programs getting compiled with
many different versions of each library, it is unreasonable to expect
calling programs to re-initialize everything manually after fork.

A further complication is the proliferation of clone flags, programs
bypassing glibc's functions to call clone directly, and programs calling
unshare, causing the glibc pthread_atfork hook to not get called.

It would be better to have the kernel take care of this automatically.

The patch also adds MADV_KEEPONFORK, to undo the effects of a prior
MADV_WIPEONFORK.

This is similar to the OpenBSD minherit syscall with MAP_INHERIT_ZERO:

    https://man.openbsd.org/minherit.2

[akpm@linux-foundation.org: numerically order arch/parisc/include/uapi/asm/mman.h #defines]
Link: http://lkml.kernel.org/r/20170811212829.29186-3-riel@redhat.com
Signed-off-by: Rik van Riel <riel@redhat.com>
Reported-by: Florian Weimer <fweimer@redhat.com>
Reported-by: Colm MacCártaigh <colm@allcosts.net>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Helge Deller <deller@gmx.de>
Cc: Kees Cook <keescook@chromium.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Drewry <wad@chromium.org>
Cc: <linux-api@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2017-09-06 17:27:30 -07:00
Mike Kravetz
aafd4562df mm: arch: consolidate mmap hugetlb size encodings 
A non-default huge page size can be encoded in the flags argument of the
mmap system call.  The definitions for these encodings are in arch
specific header files.  However, all architectures use the same values.

Consolidate all the definitions in the primary user header file
(uapi/linux/mman.h).  Include definitions for all known huge page sizes.
Use the generic encoding definitions in hugetlb_encode.h as the basis
for these definitions.

Link: http://lkml.kernel.org/r/1501527386-10736-3-git-send-email-mike.kravetz@oracle.com
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Davidlohr Bueso <dbueso@suse.de>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2017-09-06 17:27:28 -07:00
Linus Torvalds
aae3dbb477 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 
Pull networking updates from David Miller:

 1) Support ipv6 checksum offload in sunvnet driver, from Shannon
    Nelson.

 2) Move to RB-tree instead of custom AVL code in inetpeer, from Eric
    Dumazet.

 3) Allow generic XDP to work on virtual devices, from John Fastabend.

 4) Add bpf device maps and XDP_REDIRECT, which can be used to build
    arbitrary switching frameworks using XDP. From John Fastabend.

 5) Remove UFO offloads from the tree, gave us little other than bugs.

 6) Remove the IPSEC flow cache, from Florian Westphal.

 7) Support ipv6 route offload in mlxsw driver.

 8) Support VF representors in bnxt_en, from Sathya Perla.

 9) Add support for forward error correction modes to ethtool, from
    Vidya Sagar Ravipati.

10) Add time filter for packet scheduler action dumping, from Jamal Hadi
    Salim.

11) Extend the zerocopy sendmsg() used by virtio and tap to regular
    sockets via MSG_ZEROCOPY. From Willem de Bruijn.

12) Significantly rework value tracking in the BPF verifier, from Edward
    Cree.

13) Add new jump instructions to eBPF, from Daniel Borkmann.

14) Rework rtnetlink plumbing so that operations can be run without
    taking the RTNL semaphore. From Florian Westphal.

15) Support XDP in tap driver, from Jason Wang.

16) Add 32-bit eBPF JIT for ARM, from Shubham Bansal.

17) Add Huawei hinic ethernet driver.

18) Allow to report MD5 keys in TCP inet_diag dumps, from Ivan
    Delalande.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1780 commits)
  i40e: point wb_desc at the nvm_wb_desc during i40e_read_nvm_aq
  i40e: avoid NVM acquire deadlock during NVM update
  drivers: net: xgene: Remove return statement from void function
  drivers: net: xgene: Configure tx/rx delay for ACPI
  drivers: net: xgene: Read tx/rx delay for ACPI
  rocker: fix kcalloc parameter order
  rds: Fix non-atomic operation on shared flag variable
  net: sched: don't use GFP_KERNEL under spin lock
  vhost_net: correctly check tx avail during rx busy polling
  net: mdio-mux: add mdio_mux parameter to mdio_mux_init()
  rxrpc: Make service connection lookup always check for retry
  net: stmmac: Delete dead code for MDIO registration
  gianfar: Fix Tx flow control deactivation
  cxgb4: Ignore MPS_TX_INT_CAUSE[Bubble] for T6
  cxgb4: Fix pause frame count in t4_get_port_stats
  cxgb4: fix memory leak
  tun: rename generic_xdp to skb_xdp
  tun: reserve extra headroom only when XDP is set
  net: dsa: bcm_sf2: Configure IMP port TC2QOS mapping
  net: dsa: bcm_sf2: Advertise number of egress queues
  ...
 2017-09-06 14:45:08 -07:00
Matt Redfearn
56dfb7001a MIPS: Refactor handling of stack pointer in get_frame_info 
Commit 34c2f668d0 ("MIPS: microMIPS: Add unaligned access support.")
added handling of microMIPS instructions to manipulate the stack
pointer. The code that was added violates code style rules with long
lines caused by lots of nested conditionals.

The added code interprets (inline) any known stack pointer manipulation
instruction to find the stack frame size. Handling the microMIPS cases
added quite a bit of complication to this function.

Refactor is_sp_move_ins to perform the interpretation of the immediate
as the instruction manipulating the stack pointer is found. This reduces
the amount of indentation required in get_frame_info, and more closely
matches the operation of is_ra_save_ins.

Suggested-by: Maciej W. Rozycki <macro@imgtec.com>
Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/16958/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-09-06 13:21:44 +02:00
Matt Redfearn
41885b0212 MIPS: Stacktrace: Fix microMIPS stack unwinding on big endian systems 
The stack unwinding code uses the mips_instuction union to decode the
instructions it finds. That union uses the __BITFIELD_FIELD macro to
reorder depending on endianness. The stack unwinding code always places
16bit instructions in halfword 1 of the union. This makes the union
accesses correct for little endian systems. Similarly, 32bit
instructions are reordered such that they are correct for little endian
systems. This handling leaves unwinding the stack on big endian systems
broken, as the mips_instruction union will then look for the fields in
the wrong halfword.

To fix this, use a logical shift to place the 16bit instruction into the
correct position in the word field of the union. Use the same shifting
to order the 2 halfwords of 32bit instuctions. Then replace accesses to
the halfword with accesses to the shifted word.
In the case of the ADDIUS5 instruction, switch to using the
mm16_r5_format union member to avoid the need for a 16bit shift.

Fixes: 34c2f668d0 ("MIPS: microMIPS: Add unaligned access support.")
Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Cc: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/16956/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-09-06 13:21:00 +02:00
Matt Redfearn
cea8cd498f MIPS: microMIPS: Fix decoding of swsp16 instruction 
When the immediate encoded in the instruction is accessed, it is sign
extended due to being a signed value being assigned to a signed integer.
The ISA specifies that this operation is an unsigned operation.
The sign extension leads us to incorrectly decode:

801e9c8e:       cbf1            sw      ra,68(sp)

As having an immediate of 1073741809.

Since the instruction format does not specify signed/unsigned, and this
is currently the only location to use this instuction format, change it
to an unsigned immediate.

Fixes: bb9bc4689b ("MIPS: Calculate microMIPS ra properly when unwinding the stack")
Suggested-by: Paul Burton <paul.burton@imgtec.com>
Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Cc: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
Cc: Miodrag Dinic <miodrag.dinic@imgtec.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/16957/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-09-06 13:20:25 +02:00
Matt Redfearn
a0ae2b0833 MIPS: microMIPS: Fix decoding of addiusp instruction 
Commit 34c2f668d0 ("MIPS: microMIPS: Add unaligned access support.")
added handling of microMIPS instructions to manipulate the stack
pointer. Unfortunately the decoding of the addiusp instruction was
incorrect, and performed a left shift by 2 bits to the raw immediate,
rather than decoding the immediate and then performing the shift, as
documented in the ISA.

This led to incomplete stack traces, due to incorrect frame sizes being
calculated. For example the instruction:
801faee0 <do_sys_poll>:
801faee0:       4e25            addiu   sp,sp,-952

As decoded by objdump, would be interpreted by the existing code as
having manipulated the stack pointer by +1096.

Fix this by changing the order of decoding the immediate and applying
the left shift. Also change to accessing the instuction through the
union to avoid the endianness problem of accesing halfword[0], which
will fail on big endian systems.

Cope with the special behaviour of immediates 0x0, 0x1, 0x1fe and 0x1ff
by XORing with 0x100 again if mod(immediate) < 4. This logic was tested
with the following test code:

int main(int argc, char **argv)
{
	unsigned int enc;
	int imm;

	for (enc = 0; enc < 512; ++enc) {
		int tmp = enc << 2;
		imm = -(signed short)(tmp | ((tmp & 0x100) ? 0xfe00 : 0));
		unsigned short tmp = enc;
		tmp = (tmp ^ 0x100) - 0x100;
		if ((unsigned short)(tmp + 2) < 4)
			tmp ^= 0x100;
		imm = -(signed short)(tmp << 2);
		printf("%#x\t%d\t->\t(%#x\t%d)\t%#x\t%d\n",
		       enc, enc,
		       (short)tmp, (short)tmp,
		       imm, imm);
	}
	return EXIT_SUCCESS;
}

Which generates the table:

input encoding	->	tmp (matching manual)	frame size
-----------------------------------------------------------------------
0	0	->	(0x100		256)	0xfffffc00	-1024
0x1	1	->	(0x101		257)	0xfffffbfc	-1028
0x2	2	->	(0x2		2)	0xfffffff8	-8
0x3	3	->	(0x3		3)	0xfffffff4	-12
...
0xfe	254	->	(0xfe		254)	0xfffffc08	-1016
0xff	255	->	(0xff		255)	0xfffffc04	-1020
0x100	256	->	(0xffffff00	-256)	0x400		1024
0x101	257	->	(0xffffff01	-255)	0x3fc		1020
...
0x1fc	508	->	(0xfffffffc	-4)	0x10		16
0x1fd	509	->	(0xfffffffd	-3)	0xc		12
0x1fe	510	->	(0xfffffefe	-258)	0x408		1032
0x1ff	511	->	(0xfffffeff	-257)	0x404		1028

Thanks to James Hogan for the test code & verifying the logic.

Fixes: 34c2f668d0 ("MIPS: microMIPS: Add unaligned access support.")
Suggested-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/16955/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-09-06 13:19:49 +02:00
Matt Redfearn
b332fec048 MIPS: microMIPS: Fix detection of addiusp instruction 
The addiusp instruction uses the pool16d opcode, with bit 0 of the
immediate set. The test for the addiusp opcode erroneously did a logical
and of the immediate with mm_addiusp_func, which has value 1, so this
test always passes when the immediate is non-zero.

Fix the test by replacing the logical and with a bitwise and.

Fixes: 34c2f668d0 ("MIPS: microMIPS: Add unaligned access support.")
Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/16954/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-09-06 13:19:08 +02:00
Matt Redfearn
11887ed172 MIPS: Handle non word sized instructions when examining frame 
Commit 34c2f668d0 ("MIPS: microMIPS: Add unaligned access support.")
added fairly broken support for handling 16bit microMIPS instructions in
get_frame_info(). It adjusts the instruction pointer by 16bits in the
case of a 16bit sp move instruction, but not any other 16bit
instruction.

Commit b6c7a324df ("MIPS: Fix get_frame_info() handling of microMIPS
function size") goes some way to fixing get_frame_info() to iterate over
microMIPS instuctions, but the instruction pointer is still manipulated
using a postincrement, and is of union mips_instruction type. Since the
union is sized to the largest member (a word), but microMIPS
instructions are a mix of halfword and word sizes, the function does not
always iterate correctly, ending up misaligned with the instruction
stream and interpreting it incorrectly.

Since the instruction modifying the stack pointer is usually the first
in the function, that one is usually handled correctly. But the
instruction which saves the return address to the sp is some variable
number of instructions into the frame and is frequently missed due to
not being on a word boundary, leading to incomplete walking of the
stack.

Fix this by incrementing the instruction pointer based on the size of
the previously decoded instruction (& remove the hack introduced by
commit 34c2f668d0 ("MIPS: microMIPS: Add unaligned access support.")
which adjusts the instruction pointer in the case of a 16bit sp move
instruction, but not any other).

Fixes: 34c2f668d0 ("MIPS: microMIPS: Add unaligned access support.")
Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/16953/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-09-06 13:17:52 +02:00
Jonas Gorski
a18097b767 MIPS: ralink: allow NULL clock for clk_get_rate 
Make the behaviour of clk_get_rate consistent with common clk's
clk_get_rate by accepting NULL clocks as parameter. Some device
drivers rely on this, and will cause an OOPS otherwise.

Fixes: 3f0a06b036 ("MIPS: ralink: adds clkdev code")
Reported-by: Mathias Kresin <dev@kresin.me>
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Cc: John Crispin <john@phrozen.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/16778/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-09-06 12:37:45 +02:00
Jonas Gorski
386787b1fc MIPS: Loongson 2F: allow NULL clock for clk_get_rate 
Make the behaviour of clk_get_rate consistent with common clk's
clk_get_rate by accepting NULL clocks as parameter, as some device
drivers rely on this.

Make the behaviour of clk_get_rate consistent with common clk's
clk_get_rate by accepting NULL clocks as parameter. Some device
drivers rely on this, and will cause an OOPS otherwise.

Fixes: f8ede0f700 ("MIPS: Loongson 2F: Add CPU frequency scaling support")
Reported-by: Mathias Kresin <dev@kresin.me>
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/16777/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-09-06 12:36:59 +02:00
Jonas Gorski
1b495faec2 MIPS: BCM63XX: allow NULL clock for clk_get_rate 
Make the behaviour of clk_get_rate consistent with common clk's
clk_get_rate by accepting NULL clocks as parameter. Some device
drivers rely on this, and will cause an OOPS otherwise.

Fixes: e7300d04bd ("MIPS: BCM63xx: Add support for the Broadcom BCM63xx family of SOCs.")
Reported-by: Mathias Kresin <dev@kresin.me>
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Cc: bcm-kernel-feedback-list@broadcom.com
Cc: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/16776/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-09-06 12:36:21 +02:00
Jonas Gorski
585e0e9d02 MIPS: AR7: allow NULL clock for clk_get_rate 
Make the behaviour of clk_get_rate consistent with common clk's
clk_get_rate by accepting NULL clocks as parameter. Some device
drivers rely on this, and will cause an OOPS otherwise.

Fixes: 780019ddf0 ("MIPS: AR7: Implement clock API")
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Reported-by: Mathias Kresin <dev@kresin.me>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/16775/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-09-06 12:35:21 +02:00
Jonas Gorski
eebc6056d3 MIPS: BCM63XX: fix ENETDMA_6345_MAXBURST_REG offset 
The channels are only 0x40 bytes large, so 0x40 would be the next one's
CHANCFG_REG. Also the position makes it clear that this was intended to
be 0x04. So clearly a typo.

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: bcm-kernel-feedback-list@broadcom.com
Patchwork: https://patchwork.linux-mips.org/patch/15316/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-09-06 12:25:56 +02:00
Corey Minyard
5b6b084728 mips: Save all registers when saving the frame 
The MIPS frame save code was just saving a few registers, enough to
do a backtrace if every function set up a frame.  However, this is
not working if you are using DWARF unwinding, because most of the
registers are wrong.  This was causing kdump backtraces to be short
or bogus.

So save all the registers.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/16989/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-09-06 11:02:11 +02:00
Corey Minyard
866b6a89c6 MIPS: Add DWARF unwinding to assembly 
This will allow kdump dumps to work correclty with MIPS and
future DWARF unwinding of the stack to give accurate tracebacks.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/16990/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-09-06 11:01:52 +02:00
Corey Minyard
9fef686863 MIPS: Make SAVE_SOME more standard 
Modify the SAVE_SOME macro to look more like a standard
function, doing the arithmetic for the frame on the SP
register instead of copying it from K1, and by saving
the stored EPC from the RA.  This lets the get_frame_info()
function process this function like any other.  It also
remove an instruction or two from the kernel entry,
making it more efficient.

unwind_stack_by_address() has special handling for
the top of the interrupt stack, but without this change
unwinding will still fail if you get an interrupt while
handling an interrupt and try to do a traceback from
the second interrupt.

This change modifies the get_saved_sp macro to
optionally store the fetched value right into sp and store the
old SP value into K0.  Then it's just a matter of subtracting
the frame from SP and storing the old SP from K0.

This required changing the DADDI workaround a bit, since K0
holds the SP, we had to use K1 for AT.  But it eliminated
some of the special handling for the DADDI workaround.

Saving the RA register was moved up to before fetching the
CP0_EPC register, so the CP0_EPC register could be stored
into RA and the saved.  This lets the traceback code know
where RA is actually stored.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/16991/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-09-06 11:01:26 +02:00
Corey Minyard
aee16625b1 MIPS: Fix issues in backtraces 
I saw two problems when doing backtraces:

The compiler was putting a "fast return" at the top of some
functions, before it set up the frame.  The backtrace code
would stop when it saw a jump instruction, so it would never
get to the stack frame setup and would thus misinterpret it.
To fix this, don't look for jump instructions until the
frame setup has been seen.

The assembly code here is:

ffffffff80b885a0 <serial8250_handle_irq>:
ffffffff80b885a0:       c8a00003        bbit0   a1,0x0,ffffffff80b885b0 <serial8250_handle_irq+0x10>
ffffffff80b885a4:       0000102d        move    v0,zero
ffffffff80b885a8:       03e00008        jr      ra
ffffffff80b885ac:       00000000        nop
ffffffff80b885b0:       67bdffd0        daddiu  sp,sp,-48
ffffffff80b885b4:       ffb00008        sd      s0,8(sp)

The second problem was the compiler was putting the last
instruction of the frame save in the delay slot of the
jump instruction.  If it saved the RA in there, the
backtrace could would miss it and misinterpret the frame.
To fix this, make sure to process the instruction after
the first jump seen.

The assembly code for this is:

ffffffff80806fd0 <plat_irq_dispatch>:
ffffffff80806fd0:       67bdffd0        daddiu  sp,sp,-48
ffffffff80806fd4:       ffb30020        sd      s3,32(sp)
ffffffff80806fd8:       24130018        li      s3,24
ffffffff80806fdc:       ffb20018        sd      s2,24(sp)
ffffffff80806fe0:       3c12811c        lui     s2,0x811c
ffffffff80806fe4:       ffb10010        sd      s1,16(sp)
ffffffff80806fe8:       3c11811c        lui     s1,0x811c
ffffffff80806fec:       ffb00008        sd      s0,8(sp)
ffffffff80806ff0:       3c10811c        lui     s0,0x811c
ffffffff80806ff4:       08201c03        j       ffffffff8080700c <plat_irq_dispa
tch+0x3c>
ffffffff80806ff8:       ffbf0028        sd      ra,40(sp)

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/16992/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-09-06 11:01:00 +02:00
Mathieu Malaterre
ed32661699 MIPS: jz4780: DTS: Probe the jz4740-rtc driver from devicetree 
The jz4740-rtc driver supports both jz4740 & jz4780, setup the compatible
string to jz4780.

Signed-off-by: Mathieu Malaterre <malat@debian.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Paul Cercueil <paul@crapouillou.net>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: devicetree@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/17237/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-09-06 10:13:38 +02:00
Mathieu Malaterre
c76a5ba29c MIPS: Ci20: Enable RTC driver 
Update the Ci20's defconfig to enable the JZ4780's RTC driver.

Signed-off-by: Mathieu Malaterre <malat@debian.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Paul Cercueil <paul@crapouillou.net>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: devicetree@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/17236/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-09-06 10:12:28 +02:00
Christoph Hellwig
bdd1d2d3d2 fs: fix kernel_read prototype 
Use proper ssize_t and size_t types for the return value and count
argument, move the offset last and make it an in/out argument like
all other read/write helpers, and make the buf argument a void pointer
to get rid of lots of casts in the callers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
 2017-09-04 19:05:15 -04:00
Steven J. Hill
ba1fc93457 MIPS: Octeon: Allow access to CIU3 IRQ domains. 
Add accessor function octeon_irq_get_block_domain() for cores
with a CIU3.

Signed-off-by: Steven J. Hill <steven.hill@cavium.com>
Acked-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: linux-watchdog@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/17210/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-09-04 21:19:03 +02:00
Steven J. Hill
3c425df7a0 MIPS: Octeon: Make CSR functions node aware. 
Updates CSR read/write functions to be aware of nodes present in
systems with CIU3 support.

Signed-off-by: Steven J. Hill <Steven.Hill@cavium.com>
Acked-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: linux-watchdog@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/17211/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2017-09-04 21:19:03 +02:00