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authorSean Christopherson <seanjc@google.com>2021-11-11 05:07:28 +0300
committerPeter Zijlstra <peterz@infradead.org>2021-11-17 16:49:08 +0300
commit1c3430516b0732d923de9fd3bfb3e2e537eeb235 (patch)
tree5c0f082876f3d6915b25af636d43bd2df7e00f4c /include/linux/perf_event.h
parentb9f5621c9547dd787900f005a9e1c3d5712de512 (diff)
downloadlinux-1c3430516b0732d923de9fd3bfb3e2e537eeb235.tar.xz
perf: Add wrappers for invoking guest callbacks
Add helpers for the guest callbacks to prepare for burying the callbacks behind a Kconfig (it's a lot easier to provide a few stubs than to #ifdef piles of code), and also to prepare for converting the callbacks to static_call(). perf_instruction_pointer() in particular will have subtle semantics with static_call(), as the "no callbacks" case will return 0 if the callbacks are unregistered between querying guest state and getting the IP. Implement the change now to avoid a functional change when adding static_call() support, and because the new helper needs to return _something_ in this case. Signed-off-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Link: https://lore.kernel.org/r/20211111020738.2512932-8-seanjc@google.com
Diffstat (limited to 'include/linux/perf_event.h')
-rw-r--r--include/linux/perf_event.h24
1 files changed, 24 insertions, 0 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 5e6b346d62a7..346d5aff5804 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1254,6 +1254,30 @@ static inline struct perf_guest_info_callbacks *perf_get_guest_cbs(void)
*/
return rcu_dereference(perf_guest_cbs);
}
+static inline unsigned int perf_guest_state(void)
+{
+ struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
+
+ return guest_cbs ? guest_cbs->state() : 0;
+}
+static inline unsigned long perf_guest_get_ip(void)
+{
+ struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
+
+ /*
+ * Arbitrarily return '0' in the unlikely scenario that the callbacks
+ * are unregistered between checking guest state and getting the IP.
+ */
+ return guest_cbs ? guest_cbs->get_ip() : 0;
+}
+static inline unsigned int perf_guest_handle_intel_pt_intr(void)
+{
+ struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
+
+ if (guest_cbs && guest_cbs->handle_intel_pt_intr)
+ return guest_cbs->handle_intel_pt_intr();
+ return 0;
+}
extern void perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *cbs);
extern void perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *cbs);