Re: [PATCH v8 0/7] Enable L2 cache support on Exynos4210/4x12 SoCs

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Hello,

On 2014-11-13 14:18, Marek Szyprowski wrote:
This is an updated patchset, which intends to add support for L2 cache
on Exynos4 SoCs on boards running under secure firmware, which requires
certain initialization steps to be done with help of firmware, as
selected registers are writable only from secure mode.

First four patches extend existing support for secure write in L2C driver
to account for design of secure firmware running on Exynos. Namely:
  1) direct read access to certain registers is needed on Exynos, because
     secure firmware calls set several registers at once,
  2) not all boards are running secure firmware, so .write_sec callback
     needs to be installed in Exynos firmware ops initialization code,
  3) write access to {DATA,TAG}_LATENCY_CTRL registers fron non-secure world
     is not allowed and so must use l2c_write_sec as well,
  4) on certain boards, default value of prefetch register is incorrect
     and must be overridden at L2C initialization.
For boards running with firmware that provides access to individual
L2C registers this series should introduce no functional changes. However
since the driver is widely used on other platforms I'd like to kindly ask
any interested people for testing.

Further three patches add implementation of .write_sec and .configure
callbacks for Exynos secure firmware and necessary DT nodes to enable
L2 cache.

Changes in this version tested on Exynos4412-based TRATS2 and OdroidU3+
boards (both with secure firmware). There should be no functional change
for Exynos boards running without secure firmware. I do not have access
to affected non-Exynos boards, so I could not test on them.


Depends on:
  - [PATCH v3 0/5] Firmware-assisted suspend/resume of Exynos SoCs
    (https://lkml.org/lkml/2014/8/26/445)
    available in samsung/pm2 branch in
    git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc.git
  - L2C patches merged to v3.18-rc3

I assume that after all comments from previous versions, no more changes are needed
to this patchset and I would really like to have it queued to v3.19.

Arnd, Olof: could you take this patchset thought arm-soc tree? It already
contains all dependencies.

Kukjin: could you ack this patchset?

Changelog:
Changes since v7:
(https://lkml.org/lkml/2014/10/29/158)
- rebased onto arm-soc/for-next kernel tree (depends on patches merged to
   v3.18-rc3 and arm-soc/samsung/pm2 branch)
- removed 'ARM: l2c: unify L2C-310 OF initialization error messages' patch
   (no longer needed)

Changes since v6:
(https://lkml.org/lkml/2014/10/27/233)
- changed PL310 to L2C-310 prefix in error messages
- added patch shortening the error message about incorrect associativity

Changes since v5:
(https://lkml.org/lkml/2014/9/24/364)
- rebased onto v3.18-rc2
- added error message about missing properties values

Changes since v4:
(https://lkml.org/lkml/2014/8/26/461)
  - rewrote the code accessing l2x0_saved_regs from assembly code
  - added comment and reworked unconditional call to SMC_CMD_L2X0INVALL


Patch summary:

Tomasz Figa (7):
   ARM: l2c: Refactor the driver to use commit-like interface
   ARM: l2c: Add interface to ask hypervisor to configure L2C
   ARM: l2c: Get outer cache .write_sec callback from mach_desc only if
     not NULL
   ARM: l2c: Add support for overriding prefetch settings
   ARM: EXYNOS: Add .write_sec outer cache callback for L2C-310
   ARM: EXYNOS: Add support for non-secure L2X0 resume
   ARM: dts: exynos4: Add nodes for L2 cache controller

  Documentation/devicetree/bindings/arm/l2cc.txt |  10 +
  arch/arm/boot/dts/exynos4210.dtsi              |   9 +
  arch/arm/boot/dts/exynos4x12.dtsi              |  14 ++
  arch/arm/include/asm/outercache.h              |   3 +
  arch/arm/kernel/irq.c                          |   3 +-
  arch/arm/mach-exynos/firmware.c                |  50 +++++
  arch/arm/mach-exynos/sleep.S                   |  46 +++++
  arch/arm/mm/cache-l2x0.c                       | 270 ++++++++++++++++---------
  8 files changed, 309 insertions(+), 96 deletions(-)


Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland

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