diff options
Diffstat (limited to 'kernel/arch/ia64/kernel/perfmon_default_smpl.c')
-rw-r--r-- | kernel/arch/ia64/kernel/perfmon_default_smpl.c | 296 |
1 files changed, 296 insertions, 0 deletions
diff --git a/kernel/arch/ia64/kernel/perfmon_default_smpl.c b/kernel/arch/ia64/kernel/perfmon_default_smpl.c new file mode 100644 index 000000000..30c644ea4 --- /dev/null +++ b/kernel/arch/ia64/kernel/perfmon_default_smpl.c @@ -0,0 +1,296 @@ +/* + * Copyright (C) 2002-2003 Hewlett-Packard Co + * Stephane Eranian <eranian@hpl.hp.com> + * + * This file implements the default sampling buffer format + * for the Linux/ia64 perfmon-2 subsystem. + */ +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/module.h> +#include <linux/init.h> +#include <asm/delay.h> +#include <linux/smp.h> + +#include <asm/perfmon.h> +#include <asm/perfmon_default_smpl.h> + +MODULE_AUTHOR("Stephane Eranian <eranian@hpl.hp.com>"); +MODULE_DESCRIPTION("perfmon default sampling format"); +MODULE_LICENSE("GPL"); + +#define DEFAULT_DEBUG 1 + +#ifdef DEFAULT_DEBUG +#define DPRINT(a) \ + do { \ + if (unlikely(pfm_sysctl.debug >0)) { printk("%s.%d: CPU%d ", __func__, __LINE__, smp_processor_id()); printk a; } \ + } while (0) + +#define DPRINT_ovfl(a) \ + do { \ + if (unlikely(pfm_sysctl.debug > 0 && pfm_sysctl.debug_ovfl >0)) { printk("%s.%d: CPU%d ", __func__, __LINE__, smp_processor_id()); printk a; } \ + } while (0) + +#else +#define DPRINT(a) +#define DPRINT_ovfl(a) +#endif + +static int +default_validate(struct task_struct *task, unsigned int flags, int cpu, void *data) +{ + pfm_default_smpl_arg_t *arg = (pfm_default_smpl_arg_t*)data; + int ret = 0; + + if (data == NULL) { + DPRINT(("[%d] no argument passed\n", task_pid_nr(task))); + return -EINVAL; + } + + DPRINT(("[%d] validate flags=0x%x CPU%d\n", task_pid_nr(task), flags, cpu)); + + /* + * must hold at least the buffer header + one minimally sized entry + */ + if (arg->buf_size < PFM_DEFAULT_SMPL_MIN_BUF_SIZE) return -EINVAL; + + DPRINT(("buf_size=%lu\n", arg->buf_size)); + + return ret; +} + +static int +default_get_size(struct task_struct *task, unsigned int flags, int cpu, void *data, unsigned long *size) +{ + pfm_default_smpl_arg_t *arg = (pfm_default_smpl_arg_t *)data; + + /* + * size has been validated in default_validate + */ + *size = arg->buf_size; + + return 0; +} + +static int +default_init(struct task_struct *task, void *buf, unsigned int flags, int cpu, void *data) +{ + pfm_default_smpl_hdr_t *hdr; + pfm_default_smpl_arg_t *arg = (pfm_default_smpl_arg_t *)data; + + hdr = (pfm_default_smpl_hdr_t *)buf; + + hdr->hdr_version = PFM_DEFAULT_SMPL_VERSION; + hdr->hdr_buf_size = arg->buf_size; + hdr->hdr_cur_offs = sizeof(*hdr); + hdr->hdr_overflows = 0UL; + hdr->hdr_count = 0UL; + + DPRINT(("[%d] buffer=%p buf_size=%lu hdr_size=%lu hdr_version=%u cur_offs=%lu\n", + task_pid_nr(task), + buf, + hdr->hdr_buf_size, + sizeof(*hdr), + hdr->hdr_version, + hdr->hdr_cur_offs)); + + return 0; +} + +static int +default_handler(struct task_struct *task, void *buf, pfm_ovfl_arg_t *arg, struct pt_regs *regs, unsigned long stamp) +{ + pfm_default_smpl_hdr_t *hdr; + pfm_default_smpl_entry_t *ent; + void *cur, *last; + unsigned long *e, entry_size; + unsigned int npmds, i; + unsigned char ovfl_pmd; + unsigned char ovfl_notify; + + if (unlikely(buf == NULL || arg == NULL|| regs == NULL || task == NULL)) { + DPRINT(("[%d] invalid arguments buf=%p arg=%p\n", task->pid, buf, arg)); + return -EINVAL; + } + + hdr = (pfm_default_smpl_hdr_t *)buf; + cur = buf+hdr->hdr_cur_offs; + last = buf+hdr->hdr_buf_size; + ovfl_pmd = arg->ovfl_pmd; + ovfl_notify = arg->ovfl_notify; + + /* + * precheck for sanity + */ + if ((last - cur) < PFM_DEFAULT_MAX_ENTRY_SIZE) goto full; + + npmds = hweight64(arg->smpl_pmds[0]); + + ent = (pfm_default_smpl_entry_t *)cur; + + prefetch(arg->smpl_pmds_values); + + entry_size = sizeof(*ent) + (npmds << 3); + + /* position for first pmd */ + e = (unsigned long *)(ent+1); + + hdr->hdr_count++; + + DPRINT_ovfl(("[%d] count=%lu cur=%p last=%p free_bytes=%lu ovfl_pmd=%d ovfl_notify=%d npmds=%u\n", + task->pid, + hdr->hdr_count, + cur, last, + last-cur, + ovfl_pmd, + ovfl_notify, npmds)); + + /* + * current = task running at the time of the overflow. + * + * per-task mode: + * - this is usually the task being monitored. + * Under certain conditions, it might be a different task + * + * system-wide: + * - this is not necessarily the task controlling the session + */ + ent->pid = current->pid; + ent->ovfl_pmd = ovfl_pmd; + ent->last_reset_val = arg->pmd_last_reset; //pmd[0].reg_last_reset_val; + + /* + * where did the fault happen (includes slot number) + */ + ent->ip = regs->cr_iip | ((regs->cr_ipsr >> 41) & 0x3); + + ent->tstamp = stamp; + ent->cpu = smp_processor_id(); + ent->set = arg->active_set; + ent->tgid = current->tgid; + + /* + * selectively store PMDs in increasing index number + */ + if (npmds) { + unsigned long *val = arg->smpl_pmds_values; + for(i=0; i < npmds; i++) { + *e++ = *val++; + } + } + + /* + * update position for next entry + */ + hdr->hdr_cur_offs += entry_size; + cur += entry_size; + + /* + * post check to avoid losing the last sample + */ + if ((last - cur) < PFM_DEFAULT_MAX_ENTRY_SIZE) goto full; + + /* + * keep same ovfl_pmds, ovfl_notify + */ + arg->ovfl_ctrl.bits.notify_user = 0; + arg->ovfl_ctrl.bits.block_task = 0; + arg->ovfl_ctrl.bits.mask_monitoring = 0; + arg->ovfl_ctrl.bits.reset_ovfl_pmds = 1; /* reset before returning from interrupt handler */ + + return 0; +full: + DPRINT_ovfl(("sampling buffer full free=%lu, count=%lu, ovfl_notify=%d\n", last-cur, hdr->hdr_count, ovfl_notify)); + + /* + * increment number of buffer overflow. + * important to detect duplicate set of samples. + */ + hdr->hdr_overflows++; + + /* + * if no notification requested, then we saturate the buffer + */ + if (ovfl_notify == 0) { + arg->ovfl_ctrl.bits.notify_user = 0; + arg->ovfl_ctrl.bits.block_task = 0; + arg->ovfl_ctrl.bits.mask_monitoring = 1; + arg->ovfl_ctrl.bits.reset_ovfl_pmds = 0; + } else { + arg->ovfl_ctrl.bits.notify_user = 1; + arg->ovfl_ctrl.bits.block_task = 1; /* ignored for non-blocking context */ + arg->ovfl_ctrl.bits.mask_monitoring = 1; + arg->ovfl_ctrl.bits.reset_ovfl_pmds = 0; /* no reset now */ + } + return -1; /* we are full, sorry */ +} + +static int +default_restart(struct task_struct *task, pfm_ovfl_ctrl_t *ctrl, void *buf, struct pt_regs *regs) +{ + pfm_default_smpl_hdr_t *hdr; + + hdr = (pfm_default_smpl_hdr_t *)buf; + + hdr->hdr_count = 0UL; + hdr->hdr_cur_offs = sizeof(*hdr); + + ctrl->bits.mask_monitoring = 0; + ctrl->bits.reset_ovfl_pmds = 1; /* uses long-reset values */ + + return 0; +} + +static int +default_exit(struct task_struct *task, void *buf, struct pt_regs *regs) +{ + DPRINT(("[%d] exit(%p)\n", task_pid_nr(task), buf)); + return 0; +} + +static pfm_buffer_fmt_t default_fmt={ + .fmt_name = "default_format", + .fmt_uuid = PFM_DEFAULT_SMPL_UUID, + .fmt_arg_size = sizeof(pfm_default_smpl_arg_t), + .fmt_validate = default_validate, + .fmt_getsize = default_get_size, + .fmt_init = default_init, + .fmt_handler = default_handler, + .fmt_restart = default_restart, + .fmt_restart_active = default_restart, + .fmt_exit = default_exit, +}; + +static int __init +pfm_default_smpl_init_module(void) +{ + int ret; + + ret = pfm_register_buffer_fmt(&default_fmt); + if (ret == 0) { + printk("perfmon_default_smpl: %s v%u.%u registered\n", + default_fmt.fmt_name, + PFM_DEFAULT_SMPL_VERSION_MAJ, + PFM_DEFAULT_SMPL_VERSION_MIN); + } else { + printk("perfmon_default_smpl: %s cannot register ret=%d\n", + default_fmt.fmt_name, + ret); + } + + return ret; +} + +static void __exit +pfm_default_smpl_cleanup_module(void) +{ + int ret; + ret = pfm_unregister_buffer_fmt(default_fmt.fmt_uuid); + + printk("perfmon_default_smpl: unregister %s=%d\n", default_fmt.fmt_name, ret); +} + +module_init(pfm_default_smpl_init_module); +module_exit(pfm_default_smpl_cleanup_module); + |