Commit Graph

766861 Commits

Author SHA1 Message Date
Geert Uytterhoeven
6b5939d2e5
MIPS: AR7: Normalize clk API
Coldfire still provides its own variant of the clk API rather than using
the generic COMMON_CLK API.  This generally works, but it causes some
link errors with drivers using the clk_round_rate(), clk_set_rate(),
clk_set_parent(), or clk_get_parent() functions when a platform lacks
those interfaces.

This adds empty stub implementations for each of them, and I don't even
try to do something useful here but instead just print a WARN() message
to make it obvious what is going on if they ever end up being called.

The drivers that call these won't be used on these platforms (otherwise
we'd get a link error today), so the added code is harmless bloat and
will warn about accidental use.

Based on commit bd7fefe1f0 ("ARM: w90x900: normalize clk API").

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/19503/
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux-m68k@lists.linux-m68k.org
Cc: linux-mips@linux-mips.org
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
2018-06-28 14:28:59 -07:00
Paul Burton
344ebf0994
MIPS: Always use -march=<arch>, not -<arch> shortcuts
The VDSO Makefile filters CFLAGS to select a subset which it uses whilst
building the VDSO ELF. One of the flags it allows through is the -march=
flag that selects the architecture/ISA to target.

Unfortunately in cases where CONFIG_CPU_MIPS32_R{1,2}=y and the
toolchain defaults to building for MIPS64, the main MIPS Makefile ends
up using the short-form -<arch> flags in cflags-y. This is because the
calls to cc-option always fail to use the long-form -march=<arch> flag
due to the lack of an -mabi=<abi> flag in KBUILD_CFLAGS at the point
where the cc-option function is executed. The resulting GCC invocation
is something like:

  $ mips64-linux-gcc -Werror -march=mips32r2 -c -x c /dev/null -o tmp
  cc1: error: '-march=mips32r2' is not compatible with the selected ABI

These short-form -<arch> flags are dropped by the VDSO Makefile's
filtering, and so we attempt to build the VDSO without specifying any
architecture. This results in an attempt to build the VDSO using
whatever the compiler's default architecture is, regardless of whether
that is suitable for the kernel configuration.

One encountered build failure resulting from this mismatch is a
rejection of the sync instruction if the kernel is configured for a
MIPS32 or MIPS64 r1 or r2 target but the toolchain defaults to an older
architecture revision such as MIPS1 which did not include the sync
instruction:

    CC      arch/mips/vdso/gettimeofday.o
  /tmp/ccGQKoOj.s: Assembler messages:
  /tmp/ccGQKoOj.s:273: Error: opcode not supported on this processor: mips1 (mips1) `sync'
  /tmp/ccGQKoOj.s:329: Error: opcode not supported on this processor: mips1 (mips1) `sync'
  /tmp/ccGQKoOj.s:520: Error: opcode not supported on this processor: mips1 (mips1) `sync'
  /tmp/ccGQKoOj.s:714: Error: opcode not supported on this processor: mips1 (mips1) `sync'
  /tmp/ccGQKoOj.s:1009: Error: opcode not supported on this processor: mips1 (mips1) `sync'
  /tmp/ccGQKoOj.s:1066: Error: opcode not supported on this processor: mips1 (mips1) `sync'
  /tmp/ccGQKoOj.s:1114: Error: opcode not supported on this processor: mips1 (mips1) `sync'
  /tmp/ccGQKoOj.s:1279: Error: opcode not supported on this processor: mips1 (mips1) `sync'
  /tmp/ccGQKoOj.s:1334: Error: opcode not supported on this processor: mips1 (mips1) `sync'
  /tmp/ccGQKoOj.s:1374: Error: opcode not supported on this processor: mips1 (mips1) `sync'
  /tmp/ccGQKoOj.s:1459: Error: opcode not supported on this processor: mips1 (mips1) `sync'
  /tmp/ccGQKoOj.s:1514: Error: opcode not supported on this processor: mips1 (mips1) `sync'
  /tmp/ccGQKoOj.s:1814: Error: opcode not supported on this processor: mips1 (mips1) `sync'
  /tmp/ccGQKoOj.s:2002: Error: opcode not supported on this processor: mips1 (mips1) `sync'
  /tmp/ccGQKoOj.s:2066: Error: opcode not supported on this processor: mips1 (mips1) `sync'
  make[2]: *** [scripts/Makefile.build:318: arch/mips/vdso/gettimeofday.o] Error 1
  make[1]: *** [scripts/Makefile.build:558: arch/mips/vdso] Error 2
  make[1]: *** Waiting for unfinished jobs....

This can be reproduced for example by attempting to build
pistachio_defconfig using Arnd's GCC 8.1.0 mips64 toolchain from
kernel.org:

  https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_64/8.1.0/x86_64-gcc-8.1.0-nolibc-mips64-linux.tar.xz

Resolve this problem by using the long-form -march=<arch> in all cases,
which makes it through the arch/mips/vdso/Makefile's filtering & is thus
consistently used to build both the kernel proper & the VDSO.

The use of cc-option to prefer the long-form & fall back to the
short-form flags makes no sense since the short-form is just an
abbreviation for the also-supported long-form in all GCC versions that
we support building with. This means there is no case in which we have
to use the short-form -<arch> flags, so we can simply remove them.

The manual redefinition of _MIPS_ISA is removed naturally along with the
use of the short-form flags that it accompanied, and whilst here we
remove the separate assembler ISA selection. I suspect that both of
these were only required due to the mips32 vs mips2 mismatch that was
introduced by commit 59b3e8e9aa ("[MIPS] Makefile crapectomy.") and
fixed but not cleaned up by commit 9200c0b2a0 ("[MIPS] Fix Makefile
bugs for MIPS32/MIPS64 R1 and R2.").

I've marked this for backport as far as v4.4 where the MIPS VDSO was
introduced. In earlier kernels there should be no ill effect to using
the short-form flags.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: stable@vger.kernel.org # v4.4+
Reviewed-by: James Hogan <jhogan@kernel.org>
Patchwork: https://patchwork.linux-mips.org/patch/19579/
2018-06-28 14:24:30 -07:00
Joe Perches
8e5c88bfbb
MIPS: ath25: Convert random_ether_addr to eth_random_addr
random_ether_addr is a #define for eth_random_addr which is
generally preferred in kernel code by ~3:1

Convert the uses of random_ether_addr to enable removing the #define

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/19600/
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@linux-mips.org
2018-06-28 14:22:40 -07:00
Paul Burton
97c8580e85
MIPS: Annotate cpu_wait implementations with __cpuidle
Annotate cpu_wait implementations using the __cpuidle macro which
places these functions in the .cpuidle.text section. This allows
cpu_in_idle() to return true for PC values which fall within these
functions, allowing nmi_backtrace() to produce cleaner output for CPUs
running idle functions. For example:

  # echo l >/proc/sysrq-trigger
  [   38.587170] sysrq: SysRq : Show backtrace of all active CPUs
  [   38.593657] NMI backtrace for cpu 1
  [   38.597611] CPU: 1 PID: 161 Comm: sh Not tainted 4.18.0-rc1+ #27
  [   38.604306] Stack : 00000000 00000004 00000006 80486724 00000000 00000000 00000000 00000000
  [   38.613647]         80e17eda 00000034 00000000 00000000 80d20000 80b67e98 8e559c90 0ffe1e88
  [   38.622986]         00000000 00000000 80e70000 00000000 8f61db18 38312e34 722d302e 202b3163
  [   38.632324]         8e559d3c 8e559adc 00000001 6b636162 80d20000 80000000 00000000 80d1cfa4
  [   38.641664]         00000001 80d20000 80d19520 00000000 00000003 80836724 00000004 80e10004
  [   38.650993]         ...
  [   38.653724] Call Trace:
  [   38.656499] [<8040cdd0>] show_stack+0xa0/0x144
  [   38.661475] [<80b67e98>] dump_stack+0xe8/0x120
  [   38.666455] [<80b6f6d4>] nmi_cpu_backtrace+0x1b4/0x1cc
  [   38.672189] [<80b6f81c>] nmi_trigger_cpumask_backtrace+0x130/0x1e4
  [   38.679081] [<808295d8>] __handle_sysrq+0xc0/0x180
  [   38.684421] [<80829b84>] write_sysrq_trigger+0x50/0x64
  [   38.690176] [<8061c984>] proc_reg_write+0xd0/0xfc
  [   38.695447] [<805aac1c>] __vfs_write+0x54/0x194
  [   38.700500] [<805aaf24>] vfs_write+0xe0/0x18c
  [   38.705360] [<805ab190>] ksys_write+0x7c/0xf0
  [   38.710238] [<80416018>] syscall_common+0x34/0x58
  [   38.715558] Sending NMI from CPU 1 to CPUs 0,2-3:
  [   38.720916] NMI backtrace for cpu 0 skipped: idling at r4k_wait_irqoff+0x2c/0x34
  [   38.729186] NMI backtrace for cpu 3 skipped: idling at r4k_wait_irqoff+0x2c/0x34
  [   38.737449] NMI backtrace for cpu 2 skipped: idling at r4k_wait_irqoff+0x2c/0x34

Without this we get register value & backtrace output from all CPUs,
which is generally useless for those running the idle function & serves
only to overwhelm & obfuscate the meaningful output from non-idle CPUs.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/19598/
2018-06-28 14:18:54 -07:00
Rickard Strandqvist
829caee7e3
arch: mips: mm: page: Remove unused function
Remove the function sb1_dma_init() that is not used anywhere.

This was partially found by using a static code analysis program called cppcheck.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Patchwork: https://patchwork.linux-mips.org/patch/8873/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: John Crispin <blogic@openwrt.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
2018-06-24 09:27:27 -07:00
Rickard Strandqvist
ff404a936a
arch: mips: pci: pci-ip27.c: Remove unused function
Remove the function pci_enable_swapping() that is not used anywhere.

This was partially found by using a static code analysis program called cppcheck.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Patchwork: https://patchwork.linux-mips.org/patch/8867/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: John Crispin <blogic@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
2018-06-24 09:27:27 -07:00
Paul Burton
dd129c6374
MIPS: Malta: Use PIIX4 poweroff driver to power down
Remove the platform code used to power down the system, instead relying
upon the new PIIX4 poweroff driver. This reduces the amount of platform
code required for the Malta board in preparation for allowing it to be
part of a more generic kernel.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/14282/
2018-06-24 09:27:27 -07:00
Paul Burton
a07539c000
MIPS: Malta: Cleanup DMA coherence #ifdefs
DMA coherence is not user-selectable in Kconfig, and Malta selects
CONFIG_DMA_MAYBE_COHERENT which in turn selects CONFIG_DMA_NONCOHERENT.
Remove #ifdefs whose conditions can therefore never be true for Malta.

This removes a significant amount of code from bonito_quirks_setup(),
but the code is duplicated in plat_enable_iocoherency() anyway so we
lose nothing but duplication.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/14188/
2018-06-24 09:27:27 -07:00
Paul Burton
d1c5872ce1
MIPS: Set MIPS_IC_SNOOPS_REMOTE for systems with CM
In systems that include a MIPS Coherency Manager, the icache always
fills from a cache which is coherent across all CPUs. In I6400 & I6500
systems the icache fills from the dcache which is coherent across all
CPUs. In all other CM-based systems the icache fills from the L2 cache
which is shared between all cores.

This means that an icache will always see stores from remote CPUs
without needing to write them back any further than that L2, which is
what the cpu_icache_snoops_remote_store feature is used to test. In
order for it to return 1 without needing a per-platform override (which
is what Malta has relied upon so far) set the MIPS_IC_SNOOPS_REMOTE flag
when a CM is present.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/16200/
2018-06-24 09:27:27 -07:00
Joshua Kinard
8fd2d6ea66
MIPS: Use !pci_is_root_bus(bus) in ops-bridge.c
This is a manual cherrypick of commit c7ddc3d137b7 from Alastair
Bridgewater's IP35 tree that replaces two cases of
"if (bus->number > 0)" with a more correct "if (!pci_is_root_bus(bus))"
in arch/mips/pci/ops-bridge.c.

Cc: linux-mips@linux-mips.org
Cc: Alastair Bridgewater <alastair.bridgewater@gmail.com>
Suggested-by: Alastair Bridgewater <alastair.bridgewater@gmail.com>
Signed-off-by: Joshua Kinard <kumba@gentoo.org>
Patchwork: https://patchwork.linux-mips.org/patch/17501/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Linux/MIPS <linux-mips@linux-mips.org>
2018-06-24 09:27:27 -07:00
Paul Burton
8c8d953c28
MIPS: Schedule on CPUs we need to lose FPU for a mode switch
Commit 6b8322576e ("MIPS: Force CPUs to lose FP context during mode
switches") ensures that we react to PR_SET_FP_MODE prctl syscalls
quickly by broadcasting an IPI in order to cause CPUs to lose FPU access
when necessary. Whilst it achieves that, unfortunately it causes all
sorts of strange race conditions because:

 1) The IPI may arrive at a point where the FPU is in the process of
    being enabled, but that process is not yet complete leading to a
    state we aren't prepared to handle. For example:

    [  370.215903] do_cpu invoked from kernel context![#1]:
    [  370.221064] CPU: 0 PID: 963 Comm: fp-prctl Not tainted 4.9.0-rc5-00323-g210db32-dirty #226
    [  370.229420] task: a8000000fd672e00 task.stack: a8000000fd630000
    [  370.235399] $ 0   : 0000000000000000 0000000000000001 0000000000000001 a8000000fd630000
    [  370.243882] $ 4   : a8000000fd672e00 0000000000000000 0000000000000453 0000000000000000
    [  370.252317] $ 8   : 0000000000000000 a8000000fd637c28 1000000000000000 0000000000000010
    [  370.260753] $12   : 00000000140084e0 ffffffff80109c00 0000000000000000 0000000000000002
    [  370.269179] $16   : ffffffff8092f080 a8000000fd672e00 ffffffff80107fe8 a8000000fd485000
    [  370.277612] $20   : ffffffff8084d328 ffffffff80940000 0000000000000009 ffffffff80930000
    [  370.286038] $24   : 0000000000000000 900000001612048c
    [  370.294476] $28   : a8000000fd630000 a8000000fd637ac0 ffffffff80937300 ffffffff8010807c
    [  370.302909] Hi    : 0000000000000000
    [  370.306595] Lo    : 0000000000000200
    [  370.310376] epc   : ffffffff80115d38 _save_fp+0x10/0xa0
    [  370.315784] ra    : ffffffff8010807c prepare_for_fp_mode_switch+0x94/0x1b0
    [  370.322707] Status: 140084e2 KX SX UX KERNEL EXL
    [  370.327980] Cause : 1080002c (ExcCode 0b)
    [  370.332091] PrId  : 0001a428 (MIPS P6600)
    [  370.336179] Modules linked in:
    [  370.339486] Process fp-prctl (pid: 963, threadinfo=a8000000fd630000, task=a8000000fd672e00, tls=00000000756e67d0)
    [  370.349724] Stack : 0000000000000000 a8000000fd557dc0 0000000000000000 ffffffff801ca8e0
    [  370.358161]         0000000000000000 a8000000fd637b9c 0000000000000009 ffffffff80923780
    [  370.366575]         ffffffff80850000 ffffffff8011610c 00000000000000b8 ffffffff801a5084
    [  370.374989]         ffffffff8084a370 ffffffff8084a388 ffffffff80923780 ffffffff80923828
    [  370.383395]         0000000000010000 ffffffff809237a8 0000000000020000 ffffffff80a40000
    [  370.391817]         000000000000007c 00000000004a0000 00000000756dedd0 ffffffff801a5188
    [  370.400230]         a800000002014900 0000000000000001 ffffffff80923780 0000000080923828
    [  370.408644]         ffffffff80923780 ffffffff80923780 ffffffff80923828 ffffffff801a521c
    [  370.417066]         ffffffff80923780 ffffffff80923828 0000000000010000 ffffffff801a8f84
    [  370.425472]         ffffffff80a40000 a8000000fd637c20 ffffffff80a39240 0000000000000001
    [  370.433885]         ...
    [  370.436562] Call Trace:
    [  370.439222] [<ffffffff80115d38>] _save_fp+0x10/0xa0
    [  370.444305] [<ffffffff8010807c>] prepare_for_fp_mode_switch+0x94/0x1b0
    [  370.451035] [<ffffffff801ca8e0>] flush_smp_call_function_queue+0xf8/0x230
    [  370.457991] [<ffffffff8011610c>] ipi_call_interrupt+0xc/0x20
    [  370.463814] [<ffffffff801a5084>] __handle_irq_event_percpu+0xc4/0x1a8
    [  370.470404] [<ffffffff801a5188>] handle_irq_event_percpu+0x20/0x68
    [  370.476734] [<ffffffff801a521c>] handle_irq_event+0x4c/0x88
    [  370.482486] [<ffffffff801a8f84>] handle_edge_irq+0x12c/0x210
    [  370.488316] [<ffffffff801a47a0>] generic_handle_irq+0x38/0x48
    [  370.494280] [<ffffffff804a2dbc>] gic_handle_shared_int+0x194/0x268
    [  370.500616] [<ffffffff801a47a0>] generic_handle_irq+0x38/0x48
    [  370.506529] [<ffffffff80107e60>] do_IRQ+0x18/0x28
    [  370.511445] [<ffffffff804a1524>] plat_irq_dispatch+0xc4/0x140
    [  370.517339] [<ffffffff80106230>] ret_from_irq+0x0/0x4
    [  370.522583] [<ffffffff8010fad4>] do_ri+0x4fc/0x7e8
    [  370.527546] [<ffffffff80106220>] ret_from_exception+0x0/0x10

 2) The IPI may arrive during kernel use of the FPU, since we generally
    only disable preemption around use of the FPU & leave interrupts
    enabled. This can lead to us unexpectedly losing access to the FPU
    in places where it previously had not been possible. For example:

    do_cpu invoked from kernel context![#2]:
    CPU: 2 PID: 7338 Comm: fp-prctl Tainted: G      D         4.7.0-00424-g49b0c82
    #2
    task: 838e4000 ti: 88d38000 task.ti: 88d38000
    $ 0   : 00000000 00000001 ffffffff 88d3fef8
    $ 4   : 838e4000 88d38004 00000000 00000001
    $ 8   : 3400fc01 801f8020 808e9100 24000000
    $12   : dbffffff 807b69d8 807b0000 00000000
    $16   : 00000000 80786150 00400fc4 809c0398
    $20   : 809c0338 0040273c 88d3ff28 808e9d30
    $24   : 808e9d30 00400fb4
    $28   : 88d38000 88d3fe88 00000000 8011a2ac
    Hi    : 0040273c
    Lo    : 88d3ff28
    epc   : 80114178 _restore_fp+0x10/0xa0
    ra    : 8011a2ac mipsr2_decoder+0xd5c/0x1660
    Status: 1400fc03    KERNEL EXL IE
    Cause : 1080002c (ExcCode 0b)
    PrId  : 0001a920 (MIPS I6400)
    Modules linked in:
    Process fp-prctl (pid: 7338, threadinfo=88d38000, task=838e4000, tls=766527d0)
    Stack : 00000000 00000000 00000000 88d3fe98 00000000 00000000 809c0398 809c0338
          808e9100 00000000 88d3ff28 00400fc4 00400fc4 0040273c 7fb69e18 004a0000
          004a0000 004a0000 7664add0 8010de18 00000000 00000000 88d3fef8 88d3ff28
          808e9100 00000000 766527d0 8010e534 000c0000 85755000 8181d580 00000000
          00000000 00000000 004a0000 00000000 766527d0 7fb69e18 004a0000 80105c20
          ...
    Call Trace:
    [<80114178>] _restore_fp+0x10/0xa0
    [<8011a2ac>] mipsr2_decoder+0xd5c/0x1660
    [<8010de18>] do_ri+0x90/0x6b8
    [<80105c20>] ret_from_exception+0x0/0x10

At first glance a simple fix may seem to be to disable interrupts around
kernel use of the FPU rather than merely preemption, however this would
introduce further overhead outside of the mode switch path & doesn't
solve the third problem:

 3) The IPI may arrive whilst the kernel is running code that will lead
    to a preempt_disable() call & FPU usage soon. If this happens then
    the IPI will be serviced & we'll proceed to enable an FPU whilst the
    mode switch is in progress, leading to strange & inconsistent
    behaviour.

Further to all of this is a separate but related problem:

 4) There are various paths through which we may enable the FPU without
    the user having triggered a coprocessor 1 disabled exception. These
    paths are those in which we emulate instructions & then enable the
    FPU with the expectation that the user might execute an FP
    instruction shortly afterwards. However these paths have not
    previously checked whether an FP mode switch is underway for the
    task, and therefore could enable the FPU whilst such a mode switch
    is in progress leading to strange & inconsistent behaviour for user
    code.

This patch fixes all of the above by taking a step back & re-examining
our approach to FP mode switches. Up until now we have taken these basic
steps:

 a) Prevent any threads that are part of the affected process from being
    able to obtain ownership of the FPU.

 b) Cause any threads that are part of the affected process and already
    have ownership of an FPU to lose it.

 c) Set the thread flags for each thread that is part of the affected
    process to reflect the new FP mode.

 d) Allow threads to obtain ownership of the FPU again.

This approach is however more complex than necessary. All that we really
require is that the mode switch has occurred for all threads that are
part of the affected process before mips_set_process_fp_mode(), and thus
the PR_SET_FP_MODE prctl() syscall, returns. This doesn't require that
we stop threads from owning or using an FPU whilst a mode switch occurs,
only that we force them to relinquish it after the mode switch has
occurred such that they next own an FPU with the correct mode
configured. Our basic steps therefore simplify to:

 A) Set the thread flags for each thread that is part of the affected
    process to reflect the new FP mode.

 B) Cause any threads that are part of the affected process and already
    have ownership of an FPU to lose it.

We implement B) by forcing each CPU which might be running a thread
which is part of the affected process to schedule a no-op function,
which causes the affected thread to lose its FPU ownership when it is
descheduled.

The end result is simpler FP mode switching with less overhead in the
FPU enable path (ie. enable_restore_fp_context()) and fewer moving
parts.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Fixes: 9791554b45 ("MIPS,prctl: add PR_[GS]ET_FP_MODE prctl options for MIPS")
Fixes: 6b8322576e ("MIPS: Force CPUs to lose FP context during mode switches")
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: stable <stable@vger.kernel.org> # v4.0+
2018-06-24 09:27:27 -07:00
Rob Herring
9667bb039b
MIPS: lantiq: remove unnecessary of_platform_default_populate call
The DT core will call of_platform_default_populate, so it is not necessary
for arch specific code to call it unless there are custom match entries,
auxdata or parent device. Neither of those apply here, so remove the call.

Cc: John Crispin <john@phrozen.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Burton <paul.burton@mips.com>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@linux-mips.org
Signed-off-by: Rob Herring <robh@kernel.org>
Patchwork: https://patchwork.linux-mips.org/patch/19592/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-kernel@vger.kernel.org
2018-06-24 09:27:27 -07:00
Rob Herring
6a7ec6c5ca
MIPS: generic: remove unnecessary of_platform_populate call
The DT core will call of_platform_populate, so it is not necessary for
arch specific code to call it unless there are custom match entries,
auxdata or parent device. Neither of those apply here, so remove the call.

Cc: Paul Burton <paul.burton@mips.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@linux-mips.org
Signed-off-by: Rob Herring <robh@kernel.org>
Patchwork: https://patchwork.linux-mips.org/patch/19591/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-kernel@vger.kernel.org
2018-06-24 09:27:27 -07:00
Rob Herring
0279455f16
MIPS: bmips: remove unnecessary call to register "simple-bus"
The DT core will register "simple-bus" by default, so it is not necessary
for arch specific code to do so unless there are custom match entries,
auxdata or parent device. Neither of those apply here, so remove the call.

Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Burton <paul.burton@mips.com>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@linux-mips.org
Signed-off-by: Rob Herring <robh@kernel.org>
Patchwork: https://patchwork.linux-mips.org/patch/19590/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-kernel@vger.kernel.org
2018-06-24 09:27:27 -07:00
Rob Herring
40c911ed84
MIPS: netlogic: remove unnecessary of_platform_bus_probe call
The DT core code will probe "simple-bus" by default, so remove
the Netlogic specific call. The probing of simple-bus happens at
arch_initcall_sync, so the call being removed here is already a nop.

Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Burton <paul.burton@mips.com>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@linux-mips.org
Signed-off-by: Rob Herring <robh@kernel.org>
Patchwork: https://patchwork.linux-mips.org/patch/19589/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-kernel@vger.kernel.org
2018-06-24 09:27:27 -07:00
Rob Herring
f072f9ce9b
MIPS: octeon: use of_platform_populate to probe devices
of_platform_bus_probe is deprecated in favor of of_platform_populate.
of_platform_populate is stricter requiring compatible properties for
matching rather than name or type. Octeon uses compatible strings for
matching, so convert it to of_platform_populate.

Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Burton <paul.burton@mips.com>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@linux-mips.org
Signed-off-by: Rob Herring <robh@kernel.org>
Patchwork: https://patchwork.linux-mips.org/patch/19588/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-kernel@vger.kernel.org
2018-06-24 09:27:27 -07:00
Heiher
c8bf38055e
MIPS: Fix ejtag handler on SMP
On SMP systems, the shared ejtag debug buffer may be overwritten by
other cores, because every cores can generate ejtag exception at
same time.

Unfortunately, in that context, it's difficult to relax more registers
to access per cpu buffers. so use ll/sc to serialize the access.

[paul.burton@mips.com:
  This could in theory be backported at least as far back as the
  beginning of the git era, however in general it's exceedingly rare
  that anyone would hit this without further changes, so it doesn't seem
  worthwhile marking for backport.]

Signed-off-by: Heiher <r@hev.cc>
Patchwork: https://patchwork.linux-mips.org/patch/19507/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: jhogan@kernel.org
Cc: ralf@linux-mips.org
2018-06-24 09:27:27 -07:00
Masahiro Yamada
be462bd970
MIPS: boot: merge build rules of vmlinux.*.itb by using pattern rule
Merge the build rule of vmlinux.{gz,bz2,lzma,lzo}.itb, and also move
'targets' close to the related code.

[paul.burton@mips.com:
  - Remove leading tabs from assignments to itb_addr_cells, since after
    this patch moves the additions to the 'targets' variable the
    assignments to itb_addr_cells wound up being treated as part of the
    uImage rule above them, causing the .its to incorrectly be generated
    with empty ADDR_CELLS.]

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Patchwork: https://patchwork.linux-mips.org/patch/19095/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: linux-kernel@vger.kernel.org
2018-06-24 09:27:27 -07:00
Masahiro Yamada
92b34a9763
MIPS: boot: add missing targets for vmlinux.*.its
The build rule of vmlinux.*.its is invoked by $(call if_changed,...)
but it always rebuilds the target needlessly due to missing targets.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Patchwork: https://patchwork.linux-mips.org/patch/19092/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: linux-kernel@vger.kernel.org
2018-06-24 09:27:27 -07:00
Masahiro Yamada
67e09db507
MIPS: boot: fix build rule of vmlinux.its.S
As Documentation/kbuild/makefile.txt says, it is a typical mistake
to forget the FORCE prerequisite for the rule invoked by if_changed.

Add the FORCE to the prerequisite, but it must be filtered-out from
the files passed to the 'cat' command.  Because this rule generates
.vmlinux.its.S.cmd, vmlinux.its.S must be specified as targets so
that the .cmd file is included.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Patchwork: https://patchwork.linux-mips.org/patch/19097/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: linux-kernel@vger.kernel.org
2018-06-24 09:27:27 -07:00
Masahiro Yamada
321f95b643
MIPS: boot: do not include $(cpp_flags) for preprocessing ITS
$(CPP) is used here to perform macro replacement in ITS.  Do not
pass $(cpp_flags) because it pulls in more options for dependency
file generation etc. but none of which is necessary here.  ITS files
do not include any header file, so $(call if_change,...) is enough.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Patchwork: https://patchwork.linux-mips.org/patch/19093/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: linux-kernel@vger.kernel.org
2018-06-24 09:27:27 -07:00
Masahiro Yamada
902b923da6
Revert "MIPS: boot: Define __ASSEMBLY__ for its.S build"
This reverts commit 0f9da844d8.

It is true that commit 0f9da844d8 ("MIPS: boot: Define __ASSEMBLY__
for its.S build") fixed the build error, but it should not have
defined __ASSEMBLY__ just for textual substitution in arbitrary data.
The file is image tree source in this case, but the purpose of using
CPP is to replace some macros.

I merged a better solution, commit a95b37e20d ("kbuild: get
<linux/compiler_types.h> out of <linux/kconfig.h>").  The original
fix-up is no longer needed.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Patchwork: https://patchwork.linux-mips.org/patch/19096/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: linux-kernel@vger.kernel.org
2018-06-24 09:27:27 -07:00
Nicholas Mc Guire
7896de7bd7
MIPS: Octeon: assign bool true/false not 1/0
Booleans should be assigned true/false not 1/0 as comparison is not needed

Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Patchwork: https://patchwork.linux-mips.org/patch/19559/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: James Hogan <jhogan@kernel.org>
Cc: David Daney <david.daney@cavium.com>
Cc: "Steven J. Hill" <Steven.Hill@cavium.com>
Cc: Joe Perches <joe@perches.com>
Cc: Colin Ian King <colin.king@canonical.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
2018-06-24 09:27:27 -07:00
Christoph Hellwig
803ad26eed
MIPS: remove unneeded includes from dma-mapping.h
Keep this file as light as possible as it gets pulled into every
driver using dma mapping APIs.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19552/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:27:27 -07:00
Christoph Hellwig
28f512d9cb
MIPS: remove the old dma-default implementation
Now unused.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19551/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:27:27 -07:00
Christoph Hellwig
d59098a0e9
MIPS: bmips: use generic dma noncoherent ops
Provide phys_to_dma/dma_to_phys helpers, and the special
arch_sync_dma_for_cpu_all hook, everything else is generic

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19550/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:27:27 -07:00
Christoph Hellwig
faef87723a
dma-noncoherent: add a arch_sync_dma_for_cpu_all hook
The MIPS bmips platform needs a global flush when transferring ownership
back to the CPU.  Add a hook for that to the dma-noncoherent
implementation.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19549/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:27:27 -07:00
Christoph Hellwig
c5e2bbb45d
MIPS: jazz: split dma mapping operations from dma-default
Jazz actually has a very basic IOMMU, so split the ops into a separate
implementation from the generic default support (which is about to go
away anyway).

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19548/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:27:27 -07:00
Christoph Hellwig
d1f2564a56
MIPS: ath25: use generic dma noncoherent ops
Provide phys_to_dma/dma_to_phys helpers only if PCI support is
enabled, everything else is generic.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19547/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:27:27 -07:00
Christoph Hellwig
03df8229a8
MIPS: IP32: use generic dma noncoherent ops
Provide phys_to_dma/dma_to_phys helpers, everything else is generic.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19546/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:27:27 -07:00
Christoph Hellwig
e905086e6b
MIPS: loongson64: use generic dma noncoherent ops
Provide phys_to_dma/dma_to_phys helpers, everything else is generic.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19545/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:27:27 -07:00
Christoph Hellwig
f8c55dc6e8
MIPS: use generic dma noncoherent ops for simple noncoherent platforms
Convert everything not overriding dma-coherence.h to the generic
noncoherent ops.  The new dma-noncoherent.c file duplicates a lot of
the code in dma-default.c, but that file will be gone by the end of
this series.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19544/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:26:05 -07:00
Christoph Hellwig
aa4db77595
MIPS: move coherentio setup to setup.c
We want to be able to use it even when not building dma-default.c
in the near future.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19543/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:26:04 -07:00
Christoph Hellwig
54aed4dd35
MIPS: IP27: use dma_direct_ops
IP27 is coherent and has a reasonably direct mapping, just with a little
per-bus offset added into the dma address.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19542/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:26:04 -07:00
Christoph Hellwig
dffbfde758
MIPS: use dma_direct_ops for coherent I/O
Switch the simple cache coherent architectures that don't require any
DMA address translation to dma_direct_ops.

We'll soon use at least parts of the direct DMA ops implementation for
all platforms, so select the symbol globally.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19540/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:26:04 -07:00
Christoph Hellwig
d7e64bf949
MIPS: loongson: remove loongson-3 handling from dma-coherence.h
Loongson3 is dma coherent and uses swiotlb, so it will never used any
of these helpers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19541/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:26:04 -07:00
Christoph Hellwig
d3bc81befc
MIPS: loongson: untangle dma implementations
Only loongson-3 is DMA coherent and uses swiotlb.  So move the dma
address translations stubs directly to the loongson-3 code, and remove
a few Kconfig indirections.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19539/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:26:04 -07:00
Christoph Hellwig
a330a9c59b
MIPS: Octeon: move swiotlb declarations out of dma-coherence.h
No need to pull them into a global header.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19538/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:26:03 -07:00
Christoph Hellwig
1f99e4b13b
MIPS: Octeon: remove mips dma-default stubs
Octeon doesn't use the dma-default code, and now doesn't built it either,
so these stubs can be removed.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19537/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:26:03 -07:00
Christoph Hellwig
3369ddb62a
MIPS: make the default mips dma implementation optional
Octeon and loonson64 already don't use it at all, and we're going to
migrate more plaforms away from it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19536/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:26:03 -07:00
Christoph Hellwig
d3b83dcc7f
MIPS: remove the mips_dma_map_ops indirection
And use mips_default_dma_map_ops directly.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19535/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:26:03 -07:00
Christoph Hellwig
f6d302e33d
MIPS: consolidate the swiotlb implementations
Octeon and Loongson share exactly the same code, move it into a common
implementation, and use that implementation directly from get_arch_dma_ops.

Also provide the expected dma-direct.h helpers directly instead of
delegating to platform dma-coherence.h headers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19534/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:26:03 -07:00
Christoph Hellwig
e799de3efb
MIPS: loongson: remove loongson_dma_supported
swiotlb_dma_supported will always return true for a mask large enough to
cover the DMA addresses for all physical memory, which is the right
thing to do for swiotlb based dma ops.  This function returned false
if the mask was bigger than a firmware set dma_mask_bits that apparently
can be either 32 or 64, and which seems completely buggys if it actually
is not 64, as the false return negates the whole point of swiotlb.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19533/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:26:02 -07:00
Christoph Hellwig
97f9f9763a
MIPS: Octeon: refactor swiotlb code
Share a common set of swiotlb operations, and to instead branch out in
__phys_to_dma/__dma_to_phys for the PCI vs non-PCI case.  Also use const
structures for the PCI methods so that attackers can't use them as
exploit vectors.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19532/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:26:02 -07:00
Christoph Hellwig
e20c5074f8
MIPS: Octeon: unexport __phys_to_dma and __dma_to_phys
These functions are just low-level helpers for the swiotlb and dma-direct
implementations, and should never be used by drivers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/19531/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:26:02 -07:00
Christoph Hellwig
7e4dbdc112
MIPS: remove CONFIG_DMA_COHERENT
We can just check for !CONFIG_DMA_NONCOHERENT instead and simplify things
a lot.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/19530/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:26:02 -07:00
Christoph Hellwig
972dc3b79f
MIPS: simplify CONFIG_DMA_NONCOHERENT ifdefs
CONFIG_DMA_MAYBE_COHERENT already selects CONFIG_DMA_NONCOHERENT, so we
can remove the extra conditions.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/19529/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:26:02 -07:00
Christoph Hellwig
9c78ecaf7b
MIPS: remove a dead ifdef from mach-ath25/dma-coherence.h
ath25 is alwas non-coherent, so keeping these ifdefs doesn't make any sense.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/19528/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
2018-06-24 09:26:02 -07:00
Yegor Yefremov
28a87b459b
MIPS: kexec: fix typos
Correct a couple of typos within comments in
arch/mips/kernel/relocate_kernel.S.

[paul.burton@mips.com: Add a commit message.]

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Patchwork: https://patchwork.linux-mips.org/patch/19218/
Signed-off-by: Paul Burton <paul.burton@mips.com>
2018-06-24 09:26:01 -07:00
Thomas Bogendoerfer
0c3bf18491
MIPS: Make elf2ecoff work on 64bit host machines
Use fixed width integer types for ecoff structs to make elf2ecoff work
on 64bit host machines.

Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Reviewed-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/19483/
Signed-off-by: Paul Burton <paul.burton@mips.com>
2018-06-24 09:25:24 -07:00