int pmclog_configure_log(struct pmc_mdep *md, struct pmc_owner *po, int logfd) { struct proc *p; cap_rights_t rights; int error; sx_assert(&pmc_sx, SA_XLOCKED); PMCDBG2(LOG,CFG,1, "config po=%p logfd=%d", po, logfd); p = po->po_owner; /* return EBUSY if a log file was already present */ if (po->po_flags & PMC_PO_OWNS_LOGFILE) return (EBUSY); KASSERT(po->po_file == NULL, ("[pmclog,%d] po=%p file (%p) already present", __LINE__, po, po->po_file)); /* get a reference to the file state */ error = fget_write(curthread, logfd, cap_rights_init(&rights, CAP_WRITE), &po->po_file); if (error) goto error; /* mark process as owning a log file */ po->po_flags |= PMC_PO_OWNS_LOGFILE; /* mark process as using HWPMCs */ PROC_LOCK(p); p->p_flag |= P_HWPMC; PROC_UNLOCK(p); /* create a log initialization entry */ PMCLOG_RESERVE_WITH_ERROR(po, INITIALIZE, sizeof(struct pmclog_initialize)); PMCLOG_EMIT32(PMC_VERSION); PMCLOG_EMIT32(md->pmd_cputype); PMCLOG_DESPATCH(po); return (0); error: KASSERT(po->po_kthread == NULL, ("[pmclog,%d] po=%p kthread not " "stopped", __LINE__, po)); if (po->po_file) (void) fdrop(po->po_file, curthread); po->po_file = NULL; /* clear file and error state */ po->po_error = 0; po->po_flags &= ~PMC_PO_OWNS_LOGFILE; return (error); }
int pmclog_process_userlog(struct pmc_owner *po, struct pmc_op_writelog *wl) { int error; PMCDBG(LOG,WRI,1, "writelog po=%p ud=0x%x", po, wl->pm_userdata); error = 0; PMCLOG_RESERVE_WITH_ERROR(po, USERDATA, sizeof(struct pmclog_userdata)); PMCLOG_EMIT32(wl->pm_userdata); PMCLOG_DESPATCH(po); error: return (error); }
int pmclog_configure_log(struct pmc_mdep *md, struct pmc_owner *po, int logfd) { int error; struct proc *p; /* * As long as it is possible to get a LOR between pmc_sx lock and * proctree/allproc sx locks used for adding a new process, assure * the former is not held here. */ sx_assert(&pmc_sx, SA_UNLOCKED); PMCDBG(LOG,CFG,1, "config po=%p logfd=%d", po, logfd); p = po->po_owner; /* return EBUSY if a log file was already present */ if (po->po_flags & PMC_PO_OWNS_LOGFILE) return (EBUSY); KASSERT(po->po_kthread == NULL, ("[pmclog,%d] po=%p kthread (%p) already present", __LINE__, po, po->po_kthread)); KASSERT(po->po_file == NULL, ("[pmclog,%d] po=%p file (%p) already present", __LINE__, po, po->po_file)); /* get a reference to the file state */ error = fget_write(curthread, logfd, CAP_WRITE, &po->po_file); if (error) goto error; /* mark process as owning a log file */ po->po_flags |= PMC_PO_OWNS_LOGFILE; error = kproc_create(pmclog_loop, po, &po->po_kthread, RFHIGHPID, 0, "hwpmc: proc(%d)", p->p_pid); if (error) goto error; /* mark process as using HWPMCs */ PROC_LOCK(p); p->p_flag |= P_HWPMC; PROC_UNLOCK(p); /* create a log initialization entry */ PMCLOG_RESERVE_WITH_ERROR(po, INITIALIZE, sizeof(struct pmclog_initialize)); PMCLOG_EMIT32(PMC_VERSION); PMCLOG_EMIT32(md->pmd_cputype); PMCLOG_DESPATCH(po); return (0); error: /* shutdown the thread */ if (po->po_kthread) pmclog_stop_kthread(po); KASSERT(po->po_kthread == NULL, ("[pmclog,%d] po=%p kthread not " "stopped", __LINE__, po)); if (po->po_file) (void) fdrop(po->po_file, curthread); po->po_file = NULL; /* clear file and error state */ po->po_error = 0; return (error); }