mirror of
https://github.com/raspberrypi/linux.git
synced 2025-12-25 19:42:19 +00:00
efef7f184f
For historic reasons there are some TSC-related functions in the
<asm/msr.h> header, even though there's an <asm/tsc.h> header.
To facilitate the relocation of rdtsc{,_ordered}() from <asm/msr.h>
to <asm/tsc.h> and to eventually eliminate the inclusion of
<asm/msr.h> in <asm/tsc.h>, add an explicit <asm/msr.h> dependency
to the source files that reference definitions from <asm/msr.h>.
[ mingo: Clarified the changelog. ]
Signed-off-by: Xin Li (Intel) <xin@zytor.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Uros Bizjak <ubizjak@gmail.com>
Link: https://lore.kernel.org/r/20250501054241.1245648-1-xin@zytor.com
66 lines
1.3 KiB
C
66 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/export.h>
|
|
#include <linux/types.h>
|
|
#include <linux/bits.h>
|
|
|
|
#include <asm/msr.h>
|
|
#include "probe.h"
|
|
|
|
static umode_t
|
|
not_visible(struct kobject *kobj, struct attribute *attr, int i)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Accepts msr[] array with non populated entries as long as either
|
|
* msr[i].msr is 0 or msr[i].grp is NULL. Note that the default sysfs
|
|
* visibility is visible when group->is_visible callback is set.
|
|
*/
|
|
unsigned long
|
|
perf_msr_probe(struct perf_msr *msr, int cnt, bool zero, void *data)
|
|
{
|
|
unsigned long avail = 0;
|
|
unsigned int bit;
|
|
u64 val;
|
|
|
|
if (cnt >= BITS_PER_LONG)
|
|
return 0;
|
|
|
|
for (bit = 0; bit < cnt; bit++) {
|
|
if (!msr[bit].no_check) {
|
|
struct attribute_group *grp = msr[bit].grp;
|
|
u64 mask;
|
|
|
|
/* skip entry with no group */
|
|
if (!grp)
|
|
continue;
|
|
|
|
grp->is_visible = not_visible;
|
|
|
|
/* skip unpopulated entry */
|
|
if (!msr[bit].msr)
|
|
continue;
|
|
|
|
if (msr[bit].test && !msr[bit].test(bit, data))
|
|
continue;
|
|
/* Virt sucks; you cannot tell if a R/O MSR is present :/ */
|
|
if (rdmsrq_safe(msr[bit].msr, &val))
|
|
continue;
|
|
|
|
mask = msr[bit].mask;
|
|
if (!mask)
|
|
mask = ~0ULL;
|
|
/* Disable zero counters if requested. */
|
|
if (!zero && !(val & mask))
|
|
continue;
|
|
|
|
grp->is_visible = NULL;
|
|
}
|
|
avail |= BIT(bit);
|
|
}
|
|
|
|
return avail;
|
|
}
|
|
EXPORT_SYMBOL_GPL(perf_msr_probe);
|