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

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Pull perf fixes from Ingo Molnar:
 "Misc fixes:

   - AMD IBS data corruptor fix (uncovered by UBSAN)

   - an Intel PEBS entry unwind error fix

   - a HW-tracing crash fix

   - a MAINTAINERS update"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/core: Fix crash when using HW tracing kernel filters
  perf/x86/intel: Fix unwind errors from PEBS entries (mk-II)
  MAINTAINERS: Add Naveen N. Rao as kprobes co-maintainer
  perf/x86/amd/ibs: Don't access non-started event
This commit is contained in:
Linus Torvalds 2018-07-30 11:45:30 -07:00
commit 0634922a78
7 changed files with 31 additions and 18 deletions
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2
MAINTAINERS
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@ -7985,7 +7985,7 @@ F: lib/test_kmod.c
F: tools/testing/selftests/kmod/
KPROBES
M: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
M: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
M: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
M: "David S. Miller" <davem@davemloft.net>
M: Masami Hiramatsu <mhiramat@kernel.org>

6
arch/x86/events/amd/ibs.c
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@ -579,7 +579,7 @@ static int perf_ibs_handle_irq(struct perf_ibs *perf_ibs, struct pt_regs *iregs)
{
struct cpu_perf_ibs *pcpu = this_cpu_ptr(perf_ibs->pcpu);
struct perf_event *event = pcpu->event;
struct hw_perf_event *hwc = &event->hw;
struct hw_perf_event *hwc;
struct perf_sample_data data;
struct perf_raw_record raw;
struct pt_regs regs;
@ -602,6 +602,10 @@ fail:
return 0;
}
if (WARN_ON_ONCE(!event))
goto fail;
hwc = &event->hw;
msr = hwc->config_base;
buf = ibs_data.regs;
rdmsrl(msr, *buf);

3
arch/x86/events/intel/core.c
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@ -2997,6 +2997,9 @@ static int intel_pmu_hw_config(struct perf_event *event)
}
if (x86_pmu.pebs_aliases)
x86_pmu.pebs_aliases(event);
if (event->attr.sample_type & PERF_SAMPLE_CALLCHAIN)
event->attr.sample_type |= __PERF_SAMPLE_CALLCHAIN_EARLY;
}
if (needs_branch_stack(event)) {

25
arch/x86/events/intel/ds.c
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@ -1185,17 +1185,21 @@ static void setup_pebs_sample_data(struct perf_event *event,
data->data_src.val = val;
}
/*
* We must however always use iregs for the unwinder to stay sane; the
* record BP,SP,IP can point into thin air when the record is from a
* previous PMI context or an (I)RET happend between the record and
* PMI.
*/
if (sample_type & PERF_SAMPLE_CALLCHAIN)
data->callchain = perf_callchain(event, iregs);
/*
* We use the interrupt regs as a base because the PEBS record does not
* contain a full regs set, specifically it seems to lack segment
* descriptors, which get used by things like user_mode().
*
* In the simple case fix up only the IP for PERF_SAMPLE_IP.
*
* We must however always use BP,SP from iregs for the unwinder to stay
* sane; the record BP,SP can point into thin air when the record is
* from a previous PMI context or an (I)RET happend between the record
* and PMI.
*/
*regs = *iregs;
@ -1214,15 +1218,8 @@ static void setup_pebs_sample_data(struct perf_event *event,
regs->si = pebs->si;
regs->di = pebs->di;
/*
* Per the above; only set BP,SP if we don't need callchains.
*
* XXX: does this make sense?
*/
if (!(sample_type & PERF_SAMPLE_CALLCHAIN)) {
regs->bp = pebs->bp;
regs->sp = pebs->sp;
}
regs->bp = pebs->bp;
regs->sp = pebs->sp;
#ifndef CONFIG_X86_32
regs->r8 = pebs->r8;

1
include/linux/perf_event.h
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@ -1130,6 +1130,7 @@ extern void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct
extern struct perf_callchain_entry *
get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user,
u32 max_stack, bool crosstask, bool add_mark);
extern struct perf_callchain_entry *perf_callchain(struct perf_event *event, struct pt_regs *regs);
extern int get_callchain_buffers(int max_stack);
extern void put_callchain_buffers(void);

2
include/uapi/linux/perf_event.h
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@ -143,6 +143,8 @@ enum perf_event_sample_format {
PERF_SAMPLE_PHYS_ADDR = 1U << 19,
PERF_SAMPLE_MAX = 1U << 20, /* non-ABI */
__PERF_SAMPLE_CALLCHAIN_EARLY = 1ULL << 63,
};
/*

10
kernel/events/core.c
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@ -6343,7 +6343,7 @@ static u64 perf_virt_to_phys(u64 virt)
static struct perf_callchain_entry __empty_callchain = { .nr = 0, };
static struct perf_callchain_entry *
struct perf_callchain_entry *
perf_callchain(struct perf_event *event, struct pt_regs *regs)
{
bool kernel = !event->attr.exclude_callchain_kernel;
@ -6382,7 +6382,9 @@ void perf_prepare_sample(struct perf_event_header *header,
if (sample_type & PERF_SAMPLE_CALLCHAIN) {
int size = 1;
data->callchain = perf_callchain(event, regs);
if (!(sample_type & __PERF_SAMPLE_CALLCHAIN_EARLY))
data->callchain = perf_callchain(event, regs);
size += data->callchain->nr;
header->size += size * sizeof(u64);
@ -7335,6 +7337,10 @@ static bool perf_addr_filter_match(struct perf_addr_filter *filter,
struct file *file, unsigned long offset,
unsigned long size)
{
/* d_inode(NULL) won't be equal to any mapped user-space file */
if (!filter->path.dentry)
return false;
if (d_inode(filter->path.dentry) != file_inode(file))
return false;