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  1. 24 Dec, 2019 6 commits
    • Maxime Ripard's avatar
      dt-bindings: resets: Convert Allwinner legacy resets to schemas · 93adc6ae
      Maxime Ripard authored 
      The Allwinner SoCs have a legacy set of bindings (and a framework to
support it in Linux) for their reset controllers.

Now that we have the DT validation in place, let's split into separate file
and convert the device tree bindings for those resets to schemas, and mark
them all as deprecated.
Signed-off-by: default avatarMaxime Ripard <maxime@cerno.tech>
Signed-off-by: default avatarRob Herring <robh@kernel.org>
      93adc6ae
    • Maxime Ripard's avatar
      dt-bindings: mfd: Convert Allwinner legacy PRCM bindings to schemas · af287ed0
      Maxime Ripard authored 
      The Allwinner SoCs have a legacy set of bindings (and a drivers to
support it in Linux) to support the PRCM unit found in most recent SoCs.

Now that we have the DT validation in place, let's split into separate file
and convert the device tree bindings for those controllers to schemas, and
mark them all as deprecated.
Signed-off-by: default avatarMaxime Ripard <maxime@cerno.tech>
Signed-off-by: default avatarRob Herring <robh@kernel.org>
      af287ed0
    • Maxime Ripard's avatar
      dt-bindings: clocks: Convert Allwinner legacy clocks to schemas · f95cad74
      Maxime Ripard authored 
      The Allwinner SoCs have a legacy set of bindings (and a framework to
support it in Linux) for their clock controllers.

Now that we have the DT validation in place, let's split into separate file
and convert the device tree bindings for those clocks to schemas, and mark
them all as deprecated.
Signed-off-by: default avatarMaxime Ripard <maxime@cerno.tech>
Signed-off-by: default avatarRob Herring <robh@kernel.org>
      f95cad74
    • Maxime Ripard's avatar
      dt-bindings: opp: Convert Allwinner H6 OPP to a schema · b30d8cf5
      Maxime Ripard authored 
      The Allwinner H6 SoCs use binning in order to provide binning to
cpufreq which is supported in Linux, with a matching Device Tree binding.

Now that we have the DT validation in place, let's convert the device tree
bindings for that controller over to a YAML schemas.
Signed-off-by: default avatarMaxime Ripard <maxime@cerno.tech>
Signed-off-by: default avatarRob Herring <robh@kernel.org>
      b30d8cf5
    • Rob Herring's avatar
      of: Rework and simplify phandle cache to use a fixed size · 90dc0d1c
      Rob Herring authored 
      The phandle cache was added to speed up of_find_node_by_phandle() by
avoiding walking the whole DT to find a matching phandle. The
implementation has several shortcomings:

  - The cache is designed to work on a linear set of phandle values.
    This is true for dtc generated DTs, but not for other cases such as
    Power.
  - The cache isn't enabled until of_core_init() and a typical system
    may see hundreds of calls to of_find_node_by_phandle() before that
    point.
  - The cache is freed and re-allocated when the number of phandles
    changes.
  - It takes a raw spinlock around a memory allocation which breaks on
    RT.

Change the implementation to a fixed size and use hash_32() as the
cache index. This greatly simplifies the implementation. It avoids
the need for any re-alloc of the cache and taking a reference on nodes
in the cache. We only have a single source of removing cache entries
which is of_detach_node().

Using hash_32() removes any assumption on phandle values improving
the hit rate for non-linear phandle values. The effect on linear values
using hash_32() is about a 10% collision. The chances of thrashing on
colliding values seems to be low.

To compare performance, I used a RK3399 board which is a pretty typical
system. I found that just measuring boot time as done previously is
noisy and may be impacted by other things. Also bringing up secondary
cores causes some issues with measuring, so I booted with 'nr_cpus=1'.
With no caching, calls to of_find_node_by_phandle() take about 20124 us
for 1248 calls. There's an additional 288 calls before time keeping is
up. Using the average time per hit/miss with the cache, we can calculate
these calls to take 690 us (277 hit / 11 miss) with a 128 entry cache
and 13319 us with no cache or an uninitialized cache.

Comparing the 3 implementations the time spent in
of_find_node_by_phandle() is:

no cache:        20124 us (+ 13319 us)
128 entry cache:  5134 us (+ 690 us)
current cache:     819 us (+ 13319 us)

We could move the allocation of the cache earlier to improve the
current cache, but that just further complicates the situation as it
needs to be after slab is up, so we can't do it when unflattening (which
uses memblock).
Reported-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Segher Boessenkool <segher@kernel.crashing.org>
Cc: Frank Rowand <frowand.list@gmail.com>
Acked-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Reviewed-by: default avatarFrank Rowand <frowand.list@gmail.com>
Tested-by: default avatarFrank Rowand <frowand.list@gmail.com>
Signed-off-by: default avatarRob Herring <robh@kernel.org>
      90dc0d1c
    • Miquel Raynal's avatar
      dt-bindings: phy: Fix the PX30 DSI PHY compatible in the example · afd36d28
      Miquel Raynal authored 
      Use the upstream compatible instead of the BSP one in the example
section of the DT bindings for this IP.

Fixes: 3817c796 ("dt-bindings: phy: add yaml binding for rockchip,px30-dsi-dphy")
Signed-off-by: default avatarMiquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: default avatarHeiko Stuebner <heiko@sntech.de>
Signed-off-by: default avatarRob Herring <robh@kernel.org>
      afd36d28
  3. 20 Dec, 2019 2 commits
  5. 19 Dec, 2019 4 commits
  7. 18 Dec, 2019 12 commits
  9. 17 Dec, 2019 2 commits
  11. 16 Dec, 2019 9 commits
  13. 15 Dec, 2019 5 commits
    • Linus Torvalds's avatar
      Linux 5.5-rc2 · d1eef1c6
      Linus Torvalds authored
      d1eef1c6
    • Linus Torvalds's avatar
      Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma · 9603e221
      Linus Torvalds authored 
      Pull rdma fixes from Doug Ledford:
 "A small collection of -rc fixes. Mostly. One API addition, but that's
  because we wanted to use it in a fix. There's also a bug fix that is
  going to render the 5.5 kernel's soft-RoCE driver incompatible with
  all soft-RoCE versions prior, but it's required to actually implement
  the protocol according to the RoCE spec and required in order for the
  soft-RoCE driver to be able to successfully work with actual RoCE
  hardware.

  Summary:

   - Update Steve Wise info

   - Fix for soft-RoCE crc calculations (will break back compatibility,
     but only with the soft-RoCE driver, which has had this bug since it
     was introduced and it is an on-the-wire bug, but will make
     soft-RoCE fully compatible with real RoCE hardware)

   - cma init fixup

   - counters oops fix

   - fix for mlx4 init/teardown sequence

   - fix for mkx5 steering rules

   - introduce a cleanup API, which isn't a fix, but we want to use it
     in the next fix

   - fix for mlx5 memory management that uses API in previous patch"

* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma:
  IB/mlx5: Fix device memory flows
  IB/core: Introduce rdma_user_mmap_entry_insert_range() API
  IB/mlx5: Fix steering rule of drop and count
  IB/mlx4: Follow mirror sequence of device add during device removal
  RDMA/counter: Prevent auto-binding a QP which are not tracked with res
  rxe: correctly calculate iCRC for unaligned payloads
  Update mailmap info for Steve Wise
  RDMA/cma: add missed unregister_pernet_subsys in init failure
      9603e221
    • Linus Torvalds's avatar
      Merge tag 'riscv/for-v5.5-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux · 1522d9da
      Linus Torvalds authored 
      Pull RISC-V fixes from Paul Walmsley:
 "Two minor build fixes:

   - Fix builds of the ELF loader when built with 'make -j1' (nommu
     only)

   - Fix CONFIG_SOC_SIFIVE builds when CONFIG_TTY is disabled (found
     during randconfig testing)"

* tag 'riscv/for-v5.5-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
  riscv: only select serial sifive if TTY is enabled
  riscv: Fix build dependency for loader
      1522d9da
    • Linus Torvalds's avatar
      Merge tag 'for-linus-5.5b-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip · b01d7cb4
      Linus Torvalds authored 
      Pull xen fixes from Juergen Gross:
 "Two fixes: one for a resource accounting bug in some configurations
  and a fix for another patch which went into rc1"

* tag 'for-linus-5.5b-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/balloon: fix ballooned page accounting without hotplug enabled
  xen-blkback: prevent premature module unload
      b01d7cb4
    • Linus Torvalds's avatar
      Merge branch 'remove-ksys-mount-dup' of git://git.kernel.org/pub/scm/linux/kernel/git/brodo/linux · 2e6d3045
      Linus Torvalds authored 
      Pull ksys_mount() and ksys_dup() removal from Dominik Brodowski:
 "This small series replaces all in-kernel calls to the
  userspace-focused ksys_mount() and ksys_dup() with calls to
  kernel-centric functions:

  For each replacement of ksys_mount() with do_mount(), one needs to
  verify that the first and third parameter (char *dev_name, char *type)
  are strings allocated in kernelspace and that the fifth parameter
  (void *data) is either NULL or refers to a full page (only occurence
  in init/do_mounts.c::do_mount_root()). The second and fourth
  parameters (char *dir_name, unsigned long flags) are passed by
  ksys_mount() to do_mount() unchanged, and therefore do not require
  particular care.

  Moreover, instead of pretending to be userspace, the opening of
  /dev/console as stdin/stdout/stderr can be implemented using in-kernel
  functions as well. Thereby, ksys_dup() can be removed for good"

[ This doesn't get rid of the special "kernel init runs with KERNEL_DS"
  case, but it at least removes _some_ of the users of "treat kernel
  pointers as user pointers for our magical init sequence".

  One day we'll hopefully be rid of it all, and can initialize our
  init_thread addr_limit to USER_DS.    - Linus ]

* 'remove-ksys-mount-dup' of git://git.kernel.org/pub/scm/linux/kernel/git/brodo/linux:
  fs: remove ksys_dup()
  init: unify opening /dev/console as stdin/stdout/stderr
  init: use do_mount() instead of ksys_mount()
  initrd: use do_mount() instead of ksys_mount()
  devtmpfs: use do_mount() instead of ksys_mount()
      2e6d3045
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