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  1. 19 5月, 2018 1 次提交
  3. 28 2月, 2018 1 次提交
  5. 14 6月, 2017 1 次提交
  7. 07 4月, 2017 1 次提交
  9. 25 12月, 2016 2 次提交
  11. 01 12月, 2016 7 次提交
  13. 08 11月, 2016 1 次提交
  15. 15 7月, 2016 1 次提交
  17. 28 6月, 2016 2 次提交
  19. 09 5月, 2016 5 次提交
    • V
      ARC: clocksource: DT based probe · e608b53e
      由 Vineet Gupta 提交于 
      - Remove explicit clocksource setup and let it be done by OF framework
  by defining CLOCKSOURCE_OF_DECLARE() for various timers

- This allows multiple clocksources to be potentially registered
  simultaneouly: previously we could only do one - as all of them had
  same arc_counter_setup() routine for registration

- Setup routines also ensure that the underlying timer actually exists.

- Remove some of the panic() calls if underlying timer is NOT detected as
  fallback clocksource might still be available
  1. If GRFC doesn't exist, jiffies clocksource gets registered anyways
  2. if RTC doesn't exist, TIMER1 can take over (as it is always
     present)

Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: NVineet Gupta <vgupta@synopsys.com>
      e608b53e
    • V
      ARC: clockevent: DT based probe · 77c8d0d6
      由 Vineet Gupta 提交于 
       - timer frequency is derived from DT (no longer rely on top level
   DT "clock-frequency" probed early and exported by asm/clk.h)

 - TIMER0_IRQ need not be exported across arch code, confined to intc as
   it is property of same

 - Any failures in clockevent setup are considered pedantic and system
   panic()'s as there is no generic fallback (unlike clocksource where
   a jiffies based soft clocksource always exists)
Acked-by: NDaniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: NVineet Gupta <vgupta@synopsys.com>
      77c8d0d6
    • N
      ARC: clockevent: Prepare for DT based probe · 69fbd098
      由 Noam Camus 提交于 
       - call clocksource_probe()
 - This in turns needs of_clk_init() to be called earlier

Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: NNoam Camus <noamc@ezchip.com>
[vgupta: broken off from a bigger patch]
Signed-off-by: NVineet Gupta <vgupta@synopsys.com>
      69fbd098
    • N
      ARC: clockevent: switch to cpu notifier for clockevent setup · eec3c58e
      由 Noam Camus 提交于 
      ARC Timers so far have been handled as "legacy" w/o explicit description
in DT. This poses challenge for newer platforms wanting to use them.
This series will eventually help move timers over to DT.

This patch does a small change of using a CPU notifier to set clockevent
on non-boot CPUs. So explicit setup is done only on boot CPU (which will
later be done by DT)
Signed-off-by: NNoam Camus <noamc@ezchip.com>
[vgupta: broken off from a bigger patch]
Signed-off-by: NVineet Gupta <vgupta@synopsys.com>
      eec3c58e
    • V
      ARC: opencode arc_request_percpu_irq · 56957940
      由 Vineet Gupta 提交于 
      - The idea is to remove the API usage since it has a subltle
  design flaw - relies on being called on cpu0 first. This is true for
  some early per cpu irqs such as TIMER/IPI, but not for late probed
  per cpu peripherals such a perf. And it's usage in perf has already
  bitten us once: see c6317bc7
  ("ARCv2: perf: Ensure perf intr gets enabled on all cores") where we
  ended up open coding it anyways

- The seeming duplication will go away once we start using cpu notifier
  for timer setup
Signed-off-by: NVineet Gupta <vgupta@synopsys.com>
      56957940
  21. 11 3月, 2016 1 次提交
  23. 29 1月, 2016 1 次提交
  25. 28 10月, 2015 1 次提交
  27. 20 7月, 2015 1 次提交
  29. 22 6月, 2015 2 次提交
  31. 19 6月, 2015 2 次提交
  33. 23 7月, 2014 2 次提交
  35. 03 6月, 2014 1 次提交
  37. 26 3月, 2014 2 次提交
  39. 07 11月, 2013 1 次提交
  41. 06 11月, 2013 2 次提交
    • V
      ARC: use __weak instead of __attribute__((weak)) · 064a6269
      由 Vineet Gupta 提交于 
      Signed-off-by: NVineet Gupta <vgupta@synopsys.com>
      064a6269
    • C
      arc: Replace __get_cpu_var uses · 6855e95c
      由 Christoph Lameter 提交于 
      __get_cpu_var() is used for multiple purposes in the kernel source. One of them is
address calculation via the form &__get_cpu_var(x). This calculates the address for
the instance of the percpu variable of the current processor based on an offset.

Other use cases are for storing and retrieving data from the current processors percpu area.
__get_cpu_var() can be used as an lvalue when writing data or on the right side of an assignment.

__get_cpu_var() is defined as :

#define __get_cpu_var(var) (*this_cpu_ptr(&(var)))

__get_cpu_var() always only does an address determination. However, store and retrieve operations
could use a segment prefix (or global register on other platforms) to avoid the address calculation.

this_cpu_write() and this_cpu_read() can directly take an offset into a percpu area and use
optimized assembly code to read and write per cpu variables.

This patch converts __get_cpu_var into either an explicit address calculation using this_cpu_ptr()
or into a use of this_cpu operations that use the offset. Thereby address calcualtions are avoided
and less registers are used when code is generated.

At the end of the patchset all uses of __get_cpu_var have been removed so the macro is removed too.

The patchset includes passes over all arches as well. Once these operations are used throughout then
specialized macros can be defined in non -x86 arches as well in order to optimize per cpu access by
f.e. using a global register that may be set to the per cpu base.

Transformations done to __get_cpu_var()

1. Determine the address of the percpu instance of the current processor.

	DEFINE_PER_CPU(int, y);
	int *x = &__get_cpu_var(y);

    Converts to

	int *x = this_cpu_ptr(&y);

2. Same as #1 but this time an array structure is involved.

	DEFINE_PER_CPU(int, y[20]);
	int *x = __get_cpu_var(y);

    Converts to

	int *x = this_cpu_ptr(y);

3. Retrieve the content of the current processors instance of a per cpu variable.

	DEFINE_PER_CPU(int, u);
	int x = __get_cpu_var(y)

   Converts to

	int x = __this_cpu_read(y);

4. Retrieve the content of a percpu struct

	DEFINE_PER_CPU(struct mystruct, y);
	struct mystruct x = __get_cpu_var(y);

   Converts to

	memcpy(this_cpu_ptr(&x), y, sizeof(x));

5. Assignment to a per cpu variable

	DEFINE_PER_CPU(int, y)
	__get_cpu_var(y) = x;

   Converts to

	this_cpu_write(y, x);

6. Increment/Decrement etc of a per cpu variable

	DEFINE_PER_CPU(int, y);
	__get_cpu_var(y)++

   Converts to

	this_cpu_inc(y)
Acked-by: NVineet Gupta <vgupta@synopsys.com>
Signed-off-by: NChristoph Lameter <cl@linux.com>
      6855e95c
  43. 27 9月, 2013 1 次提交
  45. 27 6月, 2013 1 次提交
    • P
      arc: delete __cpuinit usage from all arc files · ce759956
      由 Paul Gortmaker 提交于 
      The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications.  For example, the fix in
commit 5e427ec2 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.

After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out.  Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.

Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
are flagged as __cpuinit  -- so if we remove the __cpuinit from
arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
content into no-ops as early as possible, since that will get rid
of these warnings.  In any case, they are temporary and harmless.

This removes all the arch/arc uses of the __cpuinit macros from
all C files.  Currently arc does not have any __CPUINIT used in
assembly files.

[1] https://lkml.org/lkml/2013/5/20/589

Cc: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: NPaul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: NVineet Gupta <vgupta@synopsys.com>
      ce759956