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Groups > linux.kernel > #1212252
| From | Alexander Shishkin <alexander.shishkin@linux.intel.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v2 5/6] perf/x86/intel/pt: Use extended error reporting in event initialization |
| Date | 2015-08-24 16:40 +0200 |
| Message-ID | <q114K-23E-5@gated-at.bofh.it> (permalink) |
| References | <q114K-23E-1@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Event attribute validation is one of the biggest sources of EINVALs around
perf_event_open() syscall. This patch annotates error checks with extended
error reporting macros to provide the user with more details on what they
are doing wrong.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
---
arch/x86/kernel/cpu/perf_event_intel_pt.c | 29 +++++++++++++++++------------
1 file changed, 17 insertions(+), 12 deletions(-)
diff --git a/arch/x86/kernel/cpu/perf_event_intel_pt.c b/arch/x86/kernel/cpu/perf_event_intel_pt.c
index 4216928344..9a09c89928 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_pt.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_pt.c
@@ -18,6 +18,8 @@
#undef DEBUG
+#define PERF_MODNAME "perf/x86/intel/pt"
+
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/types.h>
@@ -198,29 +200,29 @@ fail:
RTIT_CTL_CYC_PSB | \
RTIT_CTL_MTC)
-static bool pt_event_valid(struct perf_event *event)
+static int pt_event_valid(struct perf_event *event)
{
u64 config = event->attr.config;
u64 allowed, requested;
if ((config & PT_CONFIG_MASK) != config)
- return false;
+ return perf_err(-EINVAL, "PT config: disallowed bits");
if (config & RTIT_CTL_CYC_PSB) {
if (!pt_cap_get(PT_CAP_psb_cyc))
- return false;
+ return perf_err(-EINVAL, "PT config: PSB/CYC not supported");
allowed = pt_cap_get(PT_CAP_psb_periods);
requested = (config & RTIT_CTL_PSB_FREQ) >>
RTIT_CTL_PSB_FREQ_OFFSET;
if (requested && (!(allowed & BIT(requested))))
- return false;
+ return perf_err(-EINVAL, "PT config: unsupported PSB period");
allowed = pt_cap_get(PT_CAP_cycle_thresholds);
requested = (config & RTIT_CTL_CYC_THRESH) >>
RTIT_CTL_CYC_THRESH_OFFSET;
if (requested && (!(allowed & BIT(requested))))
- return false;
+ return perf_err(-EINVAL, "PT config: unsupported CYC threshold");
}
if (config & RTIT_CTL_MTC) {
@@ -232,20 +234,20 @@ static bool pt_event_valid(struct perf_event *event)
* CPUID is 0 will #GP, so better safe than sorry.
*/
if (!pt_cap_get(PT_CAP_mtc))
- return false;
+ return perf_err(-EINVAL, "PT config: MTC not supported");
allowed = pt_cap_get(PT_CAP_mtc_periods);
if (!allowed)
- return false;
+ return perf_err(-EINVAL, "PT config: MTC periods not supported");
requested = (config & RTIT_CTL_MTC_RANGE) >>
RTIT_CTL_MTC_RANGE_OFFSET;
if (!(allowed & BIT(requested)))
- return false;
+ return perf_err(-EINVAL, "PT config: unsupported MTC period");
}
- return true;
+ return 0;
}
/*
@@ -1111,14 +1113,17 @@ static void pt_event_destroy(struct perf_event *event)
static int pt_event_init(struct perf_event *event)
{
+ int err;
+
if (event->attr.type != pt_pmu.pmu.type)
return -ENOENT;
- if (!pt_event_valid(event))
- return -EINVAL;
+ err = pt_event_valid(event);
+ if (err)
+ return err;
if (x86_add_exclusive(x86_lbr_exclusive_pt))
- return -EBUSY;
+ return perf_err(-EBUSY, "PT conflicts with active events");
event->destroy = pt_event_destroy;
--
2.5.0
--
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[PATCH v2 0/6] perf: Introduce extended syscall error reporting Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2015-08-24 16:40 +0200
[PATCH v2 5/6] perf/x86/intel/pt: Use extended error reporting in event initialization Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2015-08-24 16:40 +0200
[PATCH v2 6/6] perf/x86/intel/bts: Use extended error reporting in event initialization Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2015-08-24 16:40 +0200
[PATCH v2 1/6] perf: Introduce extended syscall error reporting Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2015-08-24 16:40 +0200
Re: [PATCH v2 1/6] perf: Introduce extended syscall error reporting Andy Shevchenko <andy.shevchenko@gmail.com> - 2015-08-31 20:50 +0200
Re: [PATCH v2 1/6] perf: Introduce extended syscall error reporting Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2015-09-01 08:40 +0200
[PATCH v2 3/6] perf: Annotate some of the error codes with perf_err() Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2015-08-24 16:40 +0200
[PATCH v2 2/6] perf: Add file name and line number to perf extended error reports Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2015-08-24 16:40 +0200
[PATCH v2 4/6] perf/x86: Annotate some of the error codes with perf_err() Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2015-08-24 16:40 +0200
Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting Ingo Molnar <mingo@kernel.org> - 2015-08-25 10:30 +0200
Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting Johannes Berg <johannes@sipsolutions.net> - 2015-08-25 11:00 +0200
Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting Ingo Molnar <mingo@kernel.org> - 2015-08-25 11:10 +0200
Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting Ingo Molnar <mingo@kernel.org> - 2015-08-25 11:20 +0200
Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting Johannes Berg <johannes@sipsolutions.net> - 2015-08-25 11:40 +0200
Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting Ingo Molnar <mingo@kernel.org> - 2015-08-25 12:10 +0200
Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting Johannes Berg <johannes@sipsolutions.net> - 2015-08-25 12:30 +0200
Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting Ingo Molnar <mingo@kernel.org> - 2015-08-26 07:00 +0200
Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting Johannes Berg <johannes@sipsolutions.net> - 2015-08-26 09:10 +0200
Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting Ingo Molnar <mingo@kernel.org> - 2015-08-26 09:30 +0200
Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2015-08-26 19:00 +0200
Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-08-26 23:00 +0200
Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting Andrew Morton <akpm@linux-foundation.org> - 2015-08-26 20:50 +0200
Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting Peter Zijlstra <peterz@infradead.org> - 2015-08-26 22:10 +0200
Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting Andrew Morton <akpm@linux-foundation.org> - 2015-08-26 22:30 +0200
Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting Vince Weaver <vince@deater.net> - 2015-08-26 23:00 +0200
Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting Andrew Morton <akpm@linux-foundation.org> - 2015-08-26 23:00 +0200
Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting Vince Weaver <vince@deater.net> - 2015-08-26 23:20 +0200
Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting Ingo Molnar <mingo@kernel.org> - 2015-08-28 12:10 +0200
Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting Arnaldo Carvalho de Melo <acme@infradead.org> - 2015-08-26 23:10 +0200
Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting Ingo Molnar <mingo@kernel.org> - 2015-08-26 09:30 +0200
Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting Johannes Berg <johannes@sipsolutions.net> - 2015-08-26 09:40 +0200
Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting Ingo Molnar <mingo@kernel.org> - 2015-08-26 09:10 +0200
Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2015-08-26 13:40 +0200
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