#include #include #include #include #include #include #include #include #include #include #include #include #include "trace-event.h" #include "machine.h" #include "util.h" /* * global trace_event object used by trace_event__tp_format * * TODO There's no cleanup call for this. Add some sort of * __exit function support and call trace_event__cleanup * there. */ static struct trace_event tevent; static bool tevent_initialized; int trace_event__init(struct trace_event *t) { struct pevent *pevent = pevent_alloc(); if (pevent) { t->plugin_list = traceevent_load_plugins(pevent); t->pevent = pevent; } return pevent ? 0 : -1; } static int trace_event__init2(void) { int be = traceevent_host_bigendian(); struct pevent *pevent; if (trace_event__init(&tevent)) return -1; pevent = tevent.pevent; pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT); pevent_set_file_bigendian(pevent, be); pevent_set_host_bigendian(pevent, be); tevent_initialized = true; return 0; } int trace_event__register_resolver(struct machine *machine, pevent_func_resolver_t *func) { if (!tevent_initialized && trace_event__init2()) return -1; return pevent_set_function_resolver(tevent.pevent, func, machine); } void trace_event__cleanup(struct trace_event *t) { traceevent_unload_plugins(t->plugin_list, t->pevent); pevent_free(t->pevent); } /* * Returns pointer with encoded error via interface. */ static struct event_format* tp_format(const char *sys, const char *name) { struct pevent *pevent = tevent.pevent; struct event_format *event = NULL; char path[PATH_MAX]; size_t size; char *data; int err; scnprintf(path, PATH_MAX, "%s/%s/%s/format", tracing_events_path, sys, name); err = filename__read_str(path, &data, &size); if (err) return ERR_PTR(err); pevent_parse_format(pevent, &event, data, size, sys); free(data); return event; } /* * Returns pointer with encoded error via interface. */ struct event_format* trace_event__tp_format(const char *sys, const char *name) { if (!tevent_initialized && trace_event__init2()) return ERR_PTR(-ENOMEM); return tp_format(sys, name); } struct event_format *trace_event__tp_format_id(int id) { if (!tevent_initialized && trace_event__init2()) return ERR_PTR(-ENOMEM); return pevent_find_event(tevent.pevent, id); } t class='txt' type='search' size='10' name='q' value=''/>
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authorDavid S. Miller <davem@davemloft.net>2017-01-30 14:28:22 -0800
committerDavid S. Miller <davem@davemloft.net>2017-01-30 14:28:22 -0800
commit54791b276b4000b307339f269d3bf7db877d536f (patch)
tree1c2616bd373ce5ea28aac2a53e32f5b5834901ce /tools/build/Makefile
parent5d0e7705774dd412a465896d08d59a81a345c1e4 (diff)
parent047487241ff59374fded8c477f21453681f5995c (diff)
Merge branch 'sparc64-non-resumable-user-error-recovery'
Liam R. Howlett says: ==================== sparc64: Recover from userspace non-resumable PIO & MEM errors A non-resumable error from userspace is able to cause a kernel panic or trap loop due to the setup and handling of the queued traps once in the kernel. This patch series addresses both of these issues. The queues are fixed by simply zeroing the memory before use. PIO errors from userspace will result in a SIGBUS being sent to the user process. The MEM errors form userspace will result in a SIGKILL and also cause the offending pages to be claimed so they are no longer used in future tasks. SIGKILL is used to ensure that the process does not try to coredump and result in an attempt to read the memory again from within kernel space. Although there is a HV call to scrub the memory (mem_scrub), there is no easy way to guarantee that the real memory address(es) are not used by other tasks. Clearing the error with mem_scrub would zero the memory and cause the other processes to proceed with bad data. The handling of other non-resumable errors remain unchanged and will cause a panic. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'tools/build/Makefile')