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authorLinus Torvalds <torvalds@linux-foundation.org>2021-04-28 13:03:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-04-28 13:03:44 -0700
commit42dec9a936e7696bea1f27d3c5a0068cd9aa95fd (patch)
tree9d21f8d5457ea1ffb4c665d56d5b5119621ef0e2 /kernel/signal.c
parent03b2cd72aad1103127282f39c614e4722e5d9e8f (diff)
parented8e50800bf4c2d904db9c75408a67085e6cca3d (diff)
Merge tag 'perf-core-2021-04-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf event updates from Ingo Molnar: - Improve Intel uncore PMU support: - Parse uncore 'discovery tables' - a new hardware capability enumeration method introduced on the latest Intel platforms. This table is in a well-defined PCI namespace location and is read via MMIO. It is organized in an rbtree. These uncore tables will allow the discovery of standard counter blocks, but fancier counters still need to be enumerated explicitly. - Add Alder Lake support - Improve IIO stacks to PMON mapping support on Skylake servers - Add Intel Alder Lake PMU support - which requires the introduction of 'hybrid' CPUs and PMUs. Alder Lake is a mix of Golden Cove ('big') and Gracemont ('small' - Atom derived) cores. The CPU-side feature set is entirely symmetrical - but on the PMU side there's core type dependent PMU functionality. - Reduce data loss with CPU level hardware tracing on Intel PT / AUX profiling, by fixing the AUX allocation watermark logic. - Improve ring buffer allocation on NUMA systems - Put 'struct perf_event' into their separate kmem_cache pool - Add support for synchronous signals for select perf events. The immediate motivation is to support low-overhead sampling-based race detection for user-space code. The feature consists of the following main changes: - Add thread-only event inheritance via perf_event_attr::inherit_thread, which limits inheritance of events to CLONE_THREAD. - Add the ability for events to not leak through exec(), via perf_event_attr::remove_on_exec. - Allow the generation of SIGTRAP via perf_event_attr::sigtrap, extend siginfo with an u64 ::si_perf, and add the breakpoint information to ::si_addr and ::si_perf if the event is PERF_TYPE_BREAKPOINT. The siginfo support is adequate for breakpoints right now - but the new field can be used to introduce support for other types of metadata passed over siginfo as well. - Misc fixes, cleanups and smaller updates. * tag 'perf-core-2021-04-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (53 commits) signal, perf: Add missing TRAP_PERF case in siginfo_layout() signal, perf: Fix siginfo_t by avoiding u64 on 32-bit architectures perf/x86: Allow for 8<num_fixed_counters<16 perf/x86/rapl: Add support for Intel Alder Lake perf/x86/cstate: Add Alder Lake CPU support perf/x86/msr: Add Alder Lake CPU support perf/x86/intel/uncore: Add Alder Lake support perf: Extend PERF_TYPE_HARDWARE and PERF_TYPE_HW_CACHE perf/x86/intel: Add Alder Lake Hybrid support perf/x86: Support filter_match callback perf/x86/intel: Add attr_update for Hybrid PMUs perf/x86: Add structures for the attributes of Hybrid PMUs perf/x86: Register hybrid PMUs perf/x86: Factor out x86_pmu_show_pmu_cap perf/x86: Remove temporary pmu assignment in event_init perf/x86/intel: Factor out intel_pmu_check_extra_regs perf/x86/intel: Factor out intel_pmu_check_event_constraints perf/x86/intel: Factor out intel_pmu_check_num_counters perf/x86: Hybrid PMU support for extra_regs perf/x86: Hybrid PMU support for event constraints ...
Diffstat (limited to 'kernel/signal.c')
-rw-r--r--kernel/signal.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/kernel/signal.c b/kernel/signal.c
index e528f96eebc8..c3017aa8024a 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1197,6 +1197,7 @@ static inline bool has_si_pid_and_uid(struct kernel_siginfo *info)
case SIL_FAULT_MCEERR:
case SIL_FAULT_BNDERR:
case SIL_FAULT_PKUERR:
+ case SIL_PERF_EVENT:
case SIL_SYS:
ret = false;
break;
@@ -2529,6 +2530,7 @@ static void hide_si_addr_tag_bits(struct ksignal *ksig)
case SIL_FAULT_MCEERR:
case SIL_FAULT_BNDERR:
case SIL_FAULT_PKUERR:
+ case SIL_PERF_EVENT:
ksig->info.si_addr = arch_untagged_si_addr(
ksig->info.si_addr, ksig->sig, ksig->info.si_code);
break;
@@ -3210,6 +3212,8 @@ enum siginfo_layout siginfo_layout(unsigned sig, int si_code)
else if ((sig == SIGSEGV) && (si_code == SEGV_PKUERR))
layout = SIL_FAULT_PKUERR;
#endif
+ else if ((sig == SIGTRAP) && (si_code == TRAP_PERF))
+ layout = SIL_PERF_EVENT;
}
else if (si_code <= NSIGPOLL)
layout = SIL_POLL;
@@ -3339,6 +3343,10 @@ void copy_siginfo_to_external32(struct compat_siginfo *to,
#endif
to->si_pkey = from->si_pkey;
break;
+ case SIL_PERF_EVENT:
+ to->si_addr = ptr_to_compat(from->si_addr);
+ to->si_perf = from->si_perf;
+ break;
case SIL_CHLD:
to->si_pid = from->si_pid;
to->si_uid = from->si_uid;
@@ -3419,6 +3427,10 @@ static int post_copy_siginfo_from_user32(kernel_siginfo_t *to,
#endif
to->si_pkey = from->si_pkey;
break;
+ case SIL_PERF_EVENT:
+ to->si_addr = compat_ptr(from->si_addr);
+ to->si_perf = from->si_perf;
+ break;
case SIL_CHLD:
to->si_pid = from->si_pid;
to->si_uid = from->si_uid;
@@ -4599,6 +4611,7 @@ static inline void siginfo_buildtime_checks(void)
CHECK_OFFSET(si_lower);
CHECK_OFFSET(si_upper);
CHECK_OFFSET(si_pkey);
+ CHECK_OFFSET(si_perf);
/* sigpoll */
CHECK_OFFSET(si_band);

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