diff options
Diffstat (limited to 'arch/powerpc/platforms/pseries/hvCall_inst.c')
| -rw-r--r-- | arch/powerpc/platforms/pseries/hvCall_inst.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/hvCall_inst.c b/arch/powerpc/platforms/pseries/hvCall_inst.c new file mode 100644 index 000000000..6da320c78 --- /dev/null +++ b/arch/powerpc/platforms/pseries/hvCall_inst.c @@ -0,0 +1,176 @@ +/* + * Copyright (C) 2006 Mike Kravetz IBM Corporation + * + * Hypervisor Call Instrumentation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/kernel.h> +#include <linux/percpu.h> +#include <linux/debugfs.h> +#include <linux/seq_file.h> +#include <linux/cpumask.h> +#include <asm/hvcall.h> +#include <asm/firmware.h> +#include <asm/cputable.h> +#include <asm/trace.h> +#include <asm/machdep.h> + +/* For hcall instrumentation. One structure per-hcall, per-CPU */ +struct hcall_stats { + unsigned long num_calls; /* number of calls (on this CPU) */ + unsigned long tb_total; /* total wall time (mftb) of calls. */ + unsigned long purr_total; /* total cpu time (PURR) of calls. */ + unsigned long tb_start; + unsigned long purr_start; +}; +#define HCALL_STAT_ARRAY_SIZE ((MAX_HCALL_OPCODE >> 2) + 1) + +DEFINE_PER_CPU(struct hcall_stats[HCALL_STAT_ARRAY_SIZE], hcall_stats); + +/* + * Routines for displaying the statistics in debugfs + */ +static void *hc_start(struct seq_file *m, loff_t *pos) +{ + if ((int)*pos < (HCALL_STAT_ARRAY_SIZE-1)) + return (void *)(unsigned long)(*pos + 1); + + return NULL; +} + +static void *hc_next(struct seq_file *m, void *p, loff_t * pos) +{ + ++*pos; + + return hc_start(m, pos); +} + +static void hc_stop(struct seq_file *m, void *p) +{ +} + +static int hc_show(struct seq_file *m, void *p) +{ + unsigned long h_num = (unsigned long)p; + struct hcall_stats *hs = m->private; + + if (hs[h_num].num_calls) { + if (cpu_has_feature(CPU_FTR_PURR)) + seq_printf(m, "%lu %lu %lu %lu\n", h_num<<2, + hs[h_num].num_calls, + hs[h_num].tb_total, + hs[h_num].purr_total); + else + seq_printf(m, "%lu %lu %lu\n", h_num<<2, + hs[h_num].num_calls, + hs[h_num].tb_total); + } + + return 0; +} + +static const struct seq_operations hcall_inst_seq_ops = { + .start = hc_start, + .next = hc_next, + .stop = hc_stop, + .show = hc_show +}; + +static int hcall_inst_seq_open(struct inode *inode, struct file *file) +{ + int rc; + struct seq_file *seq; + + rc = seq_open(file, &hcall_inst_seq_ops); + seq = file->private_data; + seq->private = file_inode(file)->i_private; + + return rc; +} + +static const struct file_operations hcall_inst_seq_fops = { + .open = hcall_inst_seq_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + +#define HCALL_ROOT_DIR "hcall_inst" +#define CPU_NAME_BUF_SIZE 32 + + +static void probe_hcall_entry(void *ignored, unsigned long opcode, unsigned long *args) +{ + struct hcall_stats *h; + + if (opcode > MAX_HCALL_OPCODE) + return; + + h = this_cpu_ptr(&hcall_stats[opcode / 4]); + h->tb_start = mftb(); + h->purr_start = mfspr(SPRN_PURR); +} + +static void probe_hcall_exit(void *ignored, unsigned long opcode, long retval, + unsigned long *retbuf) +{ + struct hcall_stats *h; + + if (opcode > MAX_HCALL_OPCODE) + return; + + h = this_cpu_ptr(&hcall_stats[opcode / 4]); + h->num_calls++; + h->tb_total += mftb() - h->tb_start; + h->purr_total += mfspr(SPRN_PURR) - h->purr_start; +} + +static int __init hcall_inst_init(void) +{ + struct dentry *hcall_root; + struct dentry *hcall_file; + char cpu_name_buf[CPU_NAME_BUF_SIZE]; + int cpu; + + if (!firmware_has_feature(FW_FEATURE_LPAR)) + return 0; + + if (register_trace_hcall_entry(probe_hcall_entry, NULL)) + return -EINVAL; + + if (register_trace_hcall_exit(probe_hcall_exit, NULL)) { + unregister_trace_hcall_entry(probe_hcall_entry, NULL); + return -EINVAL; + } + + hcall_root = debugfs_create_dir(HCALL_ROOT_DIR, NULL); + if (!hcall_root) + return -ENOMEM; + + for_each_possible_cpu(cpu) { + snprintf(cpu_name_buf, CPU_NAME_BUF_SIZE, "cpu%d", cpu); + hcall_file = debugfs_create_file(cpu_name_buf, 0444, + hcall_root, + per_cpu(hcall_stats, cpu), + &hcall_inst_seq_fops); + if (!hcall_file) + return -ENOMEM; + } + + return 0; +} +machine_device_initcall(pseries, hcall_inst_init); |