linux.git/arch/x86/kernel/cpu/resctrl/pseudo_lock.c, branch v5.9

mmap locking API: convert mmap_sem comments

2020-06-09T16:39:14+00:00

Convert comments that reference mmap_sem to reference mmap_lock instead.

[akpm@linux-foundation.org: fix up linux-next leftovers]
[akpm@linux-foundation.org: s/lockaphore/lock/, per Vlastimil]
[akpm@linux-foundation.org: more linux-next fixups, per Michel]

Signed-off-by: Michel Lespinasse 
Signed-off-by: Andrew Morton 
Reviewed-by: Vlastimil Babka 
Reviewed-by: Daniel Jordan 
Cc: Davidlohr Bueso 
Cc: David Rientjes 
Cc: Hugh Dickins 
Cc: Jason Gunthorpe 
Cc: Jerome Glisse 
Cc: John Hubbard 
Cc: Laurent Dufour 
Cc: Liam Howlett 
Cc: Matthew Wilcox 
Cc: Peter Zijlstra 
Cc: Ying Han 
Link: http://lkml.kernel.org/r/20200520052908.204642-13-walken@google.com
Signed-off-by: Linus Torvalds

x86/resctrl: Rename asm/resctrl_sched.h to asm/resctrl.h

2020-05-06T15:45:22+00:00

asm/resctrl_sched.h is dedicated to the code used for configuration
of the CPU resource control state when a task is scheduled.

Rename resctrl_sched.h to resctrl.h in preparation of additions that
will no longer make this file dedicated to work done during scheduling.

No functional change.

Suggested-by: Borislav Petkov 
Signed-off-by: Reinette Chatre 
Signed-off-by: Borislav Petkov 
Link: https://lkml.kernel.org/r/6914e0ef880b539a82a6d889f9423496d471ad1d.1588715690.git.reinette.chatre@intel.com

Merge branch 'x86-cache-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2019-07-09T00:25:53+00:00

Pull x86 cache resource control update from Ingo Molnar:
 "Two cleanup patches"

* 'x86-cache-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/resctrl: Cleanup cbm_ensure_valid()
  x86/resctrl: Use _ASM_BX to avoid ifdeffery

x86/resctrl: Use _ASM_BX to avoid ifdeffery

2019-06-10T20:36:38+00:00

Use the _ASM_BX macro which expands to either %rbx or %ebx, depending on
the 32-bit or 64-bit config selected.

Signed-off-by: Uros Bizjak 
Signed-off-by: Borislav Petkov 
Acked-by: Reinette Chatre 
Cc: Fenghua Yu 
Cc: "H. Peter Anvin" 
Cc: Ingo Molnar 
Cc: Thomas Gleixner 
Cc: x86-ml 
Link: https://lkml.kernel.org/r/20190606200044.5730-1-ubizjak@gmail.com

sched/core: Provide a pointer to the valid CPU mask

2019-06-03T09:49:37+00:00

In commit:

  4b53a3412d66 ("sched/core: Remove the tsk_nr_cpus_allowed() wrapper")

the tsk_nr_cpus_allowed() wrapper was removed. There was not
much difference in !RT but in RT we used this to implement
migrate_disable(). Within a migrate_disable() section the CPU mask is
restricted to single CPU while the "normal" CPU mask remains untouched.

As an alternative implementation Ingo suggested to use:

	struct task_struct {
		const cpumask_t		*cpus_ptr;
		cpumask_t		cpus_mask;
        };
with
	t->cpus_ptr = &t->cpus_mask;

In -RT we then can switch the cpus_ptr to:

	t->cpus_ptr = &cpumask_of(task_cpu(p));

in a migration disabled region. The rules are simple:

 - Code that 'uses' ->cpus_allowed would use the pointer.
 - Code that 'modifies' ->cpus_allowed would use the direct mask.

Signed-off-by: Sebastian Andrzej Siewior 
Signed-off-by: Peter Zijlstra (Intel) 
Reviewed-by: Thomas Gleixner 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Link: https://lkml.kernel.org/r/20190423142636.14347-1-bigeasy@linutronix.de
Signed-off-by: Ingo Molnar

x86/resctrl: Remove duplicate MSR_MISC_FEATURE_CONTROL definition

2019-02-05T06:21:56+00:00

The definition of MSR_MISC_FEATURE_CONTROL was first introduced in

  98af74599ea0 ("x86 msr_index.h: Define MSR_MISC_FEATURE_CONTROL")

and present in Linux since v4.11.

The Cache Pseudo-Locking code added this duplicate definition in more
recent

  f2a177292bd0 ("x86/intel_rdt: Discover supported platforms via prefetch disable bits"),

available since v4.19.

Remove the duplicate definition from the resctrl subsystem and let that
code obtain the needed definition from the core architecture msr-index.h
instead.

Fixes: f2a177292bd0 ("x86/intel_rdt: Discover supported platforms via prefetch disable bits")
Signed-off-by: Reinette Chatre 
Signed-off-by: Borislav Petkov 
Cc: Fenghua Yu 
Cc: gavin.hindman@intel.com
Cc: "H. Peter Anvin" 
Cc: Ingo Molnar 
Cc: jithu.joseph@intel.com
Cc: Thomas Gleixner 
Cc: Tony Luck 
Cc: x86-ml 
Link: https://lkml.kernel.org/r/ff6b95d9b6ef6f4ac96267f130719ba1af09614b.1549312475.git.reinette.chatre@intel.com

x86/resctrl: Fixup the user-visible strings

2018-11-22T19:16:20+00:00

Fix the messages in rdt_last_cmd_printf() and rdt_last_cmd_puts() to
make them more meaningful and consistent.

 [ bp: s/cpu/CPU/; s/mem\W/memory ]

Signed-off-by: Babu Moger 
Signed-off-by: Borislav Petkov 
Cc: Andrew Morton 
Cc: Andy Lutomirski 
Cc: Arnd Bergmann 
Cc: Brijesh Singh 
Cc: "Chang S. Bae" 
Cc: David Miller 
Cc: David Woodhouse 
Cc: Dmitry Safonov 
Cc: Fenghua Yu 
Cc: Greg Kroah-Hartman 
Cc: "H. Peter Anvin" 
Cc: Ingo Molnar 
Cc: Jann Horn 
Cc: Joerg Roedel 
Cc: Jonathan Corbet 
Cc: Josh Poimboeuf 
Cc: Kate Stewart 
Cc: "Kirill A. Shutemov" 
Cc: 
Cc: Mauro Carvalho Chehab 
Cc: Paolo Bonzini 
Cc: Peter Zijlstra 
Cc: Philippe Ombredanne 
Cc: Pu Wen 
Cc: 
Cc: "Rafael J. Wysocki" 
Cc: Reinette Chatre 
Cc: Rian Hunter 
Cc: Sherry Hurwitz 
Cc: Suravee Suthikulpanit 
Cc: Thomas Gleixner 
Cc: Thomas Lendacky 
Cc: Tony Luck 
Cc: Vitaly Kuznetsov 
Cc: 
Link: https://lkml.kernel.org/r/20181121202811.4492-11-babu.moger@amd.com

x86/resctrl: Rename and move rdt files to a separate directory

2018-11-22T19:16:18+00:00

New generation of AMD processors add support for RDT (or QOS) features.
Together, these features will be called RESCTRL. With more than one
vendors supporting these features, it seems more appropriate to rename
these files.

Create a new directory with the name 'resctrl' and move all the
intel_rdt files to the new directory. This way all the resctrl related
code resides inside one directory.

 [ bp: Add SPDX identifier to the Makefile ]

Suggested-by: Borislav Petkov 
Signed-off-by: Babu Moger 
Signed-off-by: Borislav Petkov 
Cc: Andrew Morton 
Cc: Andy Lutomirski 
Cc: Arnd Bergmann 
Cc: Brijesh Singh 
Cc: "Chang S. Bae" 
Cc: David Miller 
Cc: David Woodhouse 
Cc: Dmitry Safonov 
Cc: Fenghua Yu 
Cc: Greg Kroah-Hartman 
Cc: "H. Peter Anvin" 
Cc: Ingo Molnar 
Cc: Jann Horn 
Cc: Joerg Roedel 
Cc: Jonathan Corbet 
Cc: Josh Poimboeuf 
Cc: Kate Stewart 
Cc: "Kirill A. Shutemov" 
Cc: 
Cc: Mauro Carvalho Chehab 
Cc: Paolo Bonzini 
Cc: Peter Zijlstra 
Cc: Philippe Ombredanne 
Cc: Pu Wen 
Cc: 
Cc: "Rafael J. Wysocki" 
Cc: Reinette Chatre 
Cc: Rian Hunter 
Cc: Sherry Hurwitz 
Cc: Suravee Suthikulpanit 
Cc: Thomas Gleixner 
Cc: Thomas Lendacky 
Cc: Tony Luck 
Cc: Vitaly Kuznetsov 
Cc: 
Link: https://lkml.kernel.org/r/20181121202811.4492-2-babu.moger@amd.com