linux-toradex.git/arch/sh/kernel/hw_breakpoint.c, branch v4.19

perf/arch/sh: Implement hw_breakpoint_arch_parse()

2018-06-26T07:07:57+00:00

Migrate to the new API in order to remove arch_validate_hwbkpt_settings()
that clumsily mixes up architecture validation and commit

Signed-off-by: Frederic Weisbecker 
Cc: Alexander Shishkin 
Cc: Andy Lutomirski 
Cc: Arnaldo Carvalho de Melo 
Cc: Arnaldo Carvalho de Melo 
Cc: Benjamin Herrenschmidt 
Cc: Catalin Marinas 
Cc: Chris Zankel 
Cc: Jiri Olsa 
Cc: Joel Fernandes 
Cc: Linus Torvalds 
Cc: Mark Rutland 
Cc: Max Filippov 
Cc: Michael Ellerman 
Cc: Namhyung Kim 
Cc: Paul Mackerras 
Cc: Peter Zijlstra 
Cc: Rich Felker 
Cc: Thomas Gleixner 
Cc: Will Deacon 
Cc: Yoshinori Sato 
Link: http://lkml.kernel.org/r/1529981939-8231-9-git-send-email-frederic@kernel.org
Signed-off-by: Ingo Molnar

perf/arch/sh: Remove "struct arch_hw_breakpoint::name" unused field

2018-06-26T07:07:57+00:00

This field seem to be unused, perhaps a leftover from old code...

Signed-off-by: Frederic Weisbecker 
Cc: Alexander Shishkin 
Cc: Andy Lutomirski 
Cc: Arnaldo Carvalho de Melo 
Cc: Arnaldo Carvalho de Melo 
Cc: Benjamin Herrenschmidt 
Cc: Catalin Marinas 
Cc: Chris Zankel 
Cc: Jiri Olsa 
Cc: Joel Fernandes 
Cc: Linus Torvalds 
Cc: Mark Rutland 
Cc: Max Filippov 
Cc: Michael Ellerman 
Cc: Namhyung Kim 
Cc: Paul Mackerras 
Cc: Peter Zijlstra 
Cc: Rich Felker 
Cc: Thomas Gleixner 
Cc: Will Deacon 
Cc: Yoshinori Sato 
Link: http://lkml.kernel.org/r/1529981939-8231-8-git-send-email-frederic@kernel.org
Signed-off-by: Ingo Molnar

perf/hw_breakpoint: Pass arch breakpoint struct to arch_check_bp_in_kernelspace()

2018-06-26T07:07:54+00:00

We can't pass the breakpoint directly on arch_check_bp_in_kernelspace()
anymore because its architecture internal datas (struct arch_hw_breakpoint)
are not yet filled by the time we call the function, and most
implementation need this backend to be up to date. So arrange the
function to take the probing struct instead.

Signed-off-by: Frederic Weisbecker 
Cc: Alexander Shishkin 
Cc: Andy Lutomirski 
Cc: Arnaldo Carvalho de Melo 
Cc: Arnaldo Carvalho de Melo 
Cc: Benjamin Herrenschmidt 
Cc: Catalin Marinas 
Cc: Chris Zankel 
Cc: Jiri Olsa 
Cc: Joel Fernandes 
Cc: Linus Torvalds 
Cc: Mark Rutland 
Cc: Max Filippov 
Cc: Michael Ellerman 
Cc: Namhyung Kim 
Cc: Paul Mackerras 
Cc: Peter Zijlstra 
Cc: Rich Felker 
Cc: Thomas Gleixner 
Cc: Will Deacon 
Cc: Yoshinori Sato 
Link: http://lkml.kernel.org/r/1529981939-8231-3-git-send-email-frederic@kernel.org
Signed-off-by: Ingo Molnar

signal/sh: Use force_sig_fault in hw_breakpoint_handler

2018-04-19T21:41:27+00:00

The call chain is:
breakpoint
  notify_die
    hw_breakpoint_exceptions_notify
      hw_breakpoint_handler

So the signal number can only be SIGTRAP.

In hw_breakpoint_handler rc is either NOTIFY_STOP or NOTIF_DONE
both of which notifier_to_errno converts to 0.  So si_errno is 0.

Historically si_addr was left unitialized in struct siginfo which is a
bug.  There appears to be no consensus among the various architectures
which value should be in si_addr.  So since no usable value has
been returned up to this point return NULL in si_addr.

Fixes: 4352fc1b12fa ("sh: Abstracted SH-4A UBC support on hw-breakpoint core.")
Fixes: 34d0b5af50a0 ("sh: Convert ptrace to hw_breakpoint API.")
Cc: Yoshinori Sato 
Cc: Rich Felker 
Cc: Paul Mundt 
Cc: linux-sh@vger.kernel.org
Signed-off-by: "Eric W. Biederman"

sched/headers: Prepare for new header dependencies before moving code to

2017-03-02T07:42:29+00:00

We are going to split  out of , which
will have to be picked up from other headers and a couple of .c files.

Create a trivial placeholder  file that just
maps to  to make this patch obviously correct and
bisectable.

Include the new header in the files that are going to need it.

Acked-by: Linus Torvalds 
Cc: Mike Galbraith 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar

sh: Replace __get_cpu_var uses

2014-06-04T23:53:52+00:00

__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 calculations are avoided and less
registers are used when code is generated.

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

The patch set 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, y);
	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(&x, this_cpu_ptr(&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)

Signed-off-by: Christoph Lameter 
Tested-by: Geert Uytterhoeven  [compilation only]
Cc: Paul Mundt 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Disintegrate asm/system.h for SH

2012-03-28T17:30:03+00:00

Disintegrate asm/system.h for SH.

Signed-off-by: David Howells 
cc: linux-sh@vger.kernel.org

Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6

2010-05-19T18:36:03+00:00

* git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6: (127 commits)
  sh: update defconfigs.
  sh: Fix up the NUMA build for recent LMB changes.
  sh64: provide a stub per_cpu_trap_init() definition.
  sh: fix up CONFIG_KEXEC=n build.
  sh: fixup the docbook paths for clock framework shuffling.
  driver core: Early dev_name() depends on slab_is_available().
  sh: simplify WARN usage in SH clock driver
  sh: Check return value of clk_get on ms7724
  sh: Check return value of clk_get on ecovec24
  sh: move sh clock-cpg.c contents to drivers/sh/clk-cpg.c
  sh: move sh clock.c contents to drivers/sh/clk.
  sh: move sh asm/clock.h contents to linux/sh_clk.h V2
  sh: remove unused clock lookup
  sh: switch boards to clkdev
  sh: switch sh4-202 to clkdev
  sh: switch shx3 to clkdev
  sh: switch sh7757 to clkdev
  sh: switch sh7763 to clkdev
  sh: switch sh7780 to clkdev
  sh: switch sh7786 to clkdev
  ...

hw-breakpoints: Change/Enforce some breakpoints policies

2010-05-01T02:32:10+00:00

The current policies of breakpoints in x86 and SH are the following:

- task bound breakpoints can only break on userspace addresses
- cpu wide breakpoints can only break on kernel addresses

The former rule prevents ptrace breakpoints to be set to trigger on
kernel addresses, which is good. But as a side effect, we can't
breakpoint on kernel addresses for task bound breakpoints.

The latter rule simply makes no sense, there is no reason why we
can't set breakpoints on userspace while performing cpu bound
profiles.

We want the following new policies:

- task bound breakpoint can set userspace address breakpoints, with
no particular privilege required.
- task bound breakpoints can set kernelspace address breakpoints but
must be privileged to do that.
- cpu bound breakpoints can do what they want as they are privileged
already.

To implement these new policies, this patch checks if we are dealing
with a kernel address breakpoint, if so and if the exclude_kernel
parameter is set, we tell the user that the breakpoint is invalid,
which makes a good generic ptrace protection.
If we don't have exclude_kernel, ensure the user has the right
privileges as kernel breakpoints are quite sensitive (risk of
trap recursion attacks and global performance impacts).

[ Paul Mundt: keep addr space check for sh signal delivery and fix
  double function declaration]

Signed-off-by: Frederic Weisbecker 
Cc: Will Deacon 
Cc: Mahesh Salgaonkar 
Cc: K. Prasad 
Cc: Paul Mundt 
Cc: Benjamin Herrenschmidt 
Cc: Paul Mackerras 
Cc: Jason Wessel 
Cc: Ingo Molnar 
Signed-off-by: Paul Mundt

sh: hw-breakpoints: Kill off stub unthrottle callback.

2010-04-21T02:38:04+00:00

This follows the x86 change and kills off the unthrottle stub. As the x86
change killed off the generic callback it isn't used anymore anyways.

Signed-off-by: Paul Mundt