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57ad583f20
Symbolic macros are unintuitive and hard to read, whereas octal constants are much easier to interpret. Replace macros for the basic permission flags (user/group/other read/write/execute) with numeric constants instead, across the whole powerpc tree. Introducing a significant number of changes across the tree for no runtime benefit isn't exactly desirable, but so long as these macros are still used in the tree people will keep sending patches that add them. Not only are they hard to parse at a glance, there are multiple ways of coming to the same value (as you can see with 0444 and 0644 in this patch) which hurts readability. Signed-off-by: Russell Currey <ruscur@russell.cc> Reviewed-by: Cyril Bur <cyrilbur@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
177 lines
4.4 KiB
C
177 lines
4.4 KiB
C
/*
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* Copyright (C) 2006 Mike Kravetz IBM Corporation
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*
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* Hypervisor Call Instrumentation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/percpu.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/cpumask.h>
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#include <asm/hvcall.h>
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#include <asm/firmware.h>
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#include <asm/cputable.h>
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#include <asm/trace.h>
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#include <asm/machdep.h>
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/* For hcall instrumentation. One structure per-hcall, per-CPU */
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struct hcall_stats {
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unsigned long num_calls; /* number of calls (on this CPU) */
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unsigned long tb_total; /* total wall time (mftb) of calls. */
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unsigned long purr_total; /* total cpu time (PURR) of calls. */
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unsigned long tb_start;
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unsigned long purr_start;
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};
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#define HCALL_STAT_ARRAY_SIZE ((MAX_HCALL_OPCODE >> 2) + 1)
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DEFINE_PER_CPU(struct hcall_stats[HCALL_STAT_ARRAY_SIZE], hcall_stats);
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/*
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* Routines for displaying the statistics in debugfs
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*/
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static void *hc_start(struct seq_file *m, loff_t *pos)
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{
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if ((int)*pos < (HCALL_STAT_ARRAY_SIZE-1))
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return (void *)(unsigned long)(*pos + 1);
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return NULL;
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}
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static void *hc_next(struct seq_file *m, void *p, loff_t * pos)
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{
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++*pos;
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return hc_start(m, pos);
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}
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static void hc_stop(struct seq_file *m, void *p)
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{
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}
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static int hc_show(struct seq_file *m, void *p)
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{
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unsigned long h_num = (unsigned long)p;
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struct hcall_stats *hs = m->private;
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if (hs[h_num].num_calls) {
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if (cpu_has_feature(CPU_FTR_PURR))
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seq_printf(m, "%lu %lu %lu %lu\n", h_num<<2,
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hs[h_num].num_calls,
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hs[h_num].tb_total,
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hs[h_num].purr_total);
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else
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seq_printf(m, "%lu %lu %lu\n", h_num<<2,
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hs[h_num].num_calls,
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hs[h_num].tb_total);
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}
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return 0;
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}
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static const struct seq_operations hcall_inst_seq_ops = {
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.start = hc_start,
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.next = hc_next,
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.stop = hc_stop,
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.show = hc_show
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};
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static int hcall_inst_seq_open(struct inode *inode, struct file *file)
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{
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int rc;
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struct seq_file *seq;
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rc = seq_open(file, &hcall_inst_seq_ops);
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seq = file->private_data;
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seq->private = file_inode(file)->i_private;
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return rc;
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}
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static const struct file_operations hcall_inst_seq_fops = {
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.open = hcall_inst_seq_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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#define HCALL_ROOT_DIR "hcall_inst"
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#define CPU_NAME_BUF_SIZE 32
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static void probe_hcall_entry(void *ignored, unsigned long opcode, unsigned long *args)
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{
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struct hcall_stats *h;
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if (opcode > MAX_HCALL_OPCODE)
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return;
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h = this_cpu_ptr(&hcall_stats[opcode / 4]);
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h->tb_start = mftb();
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h->purr_start = mfspr(SPRN_PURR);
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}
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static void probe_hcall_exit(void *ignored, unsigned long opcode, unsigned long retval,
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unsigned long *retbuf)
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{
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struct hcall_stats *h;
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if (opcode > MAX_HCALL_OPCODE)
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return;
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h = this_cpu_ptr(&hcall_stats[opcode / 4]);
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h->num_calls++;
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h->tb_total += mftb() - h->tb_start;
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h->purr_total += mfspr(SPRN_PURR) - h->purr_start;
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}
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static int __init hcall_inst_init(void)
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{
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struct dentry *hcall_root;
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struct dentry *hcall_file;
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char cpu_name_buf[CPU_NAME_BUF_SIZE];
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int cpu;
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if (!firmware_has_feature(FW_FEATURE_LPAR))
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return 0;
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if (register_trace_hcall_entry(probe_hcall_entry, NULL))
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return -EINVAL;
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if (register_trace_hcall_exit(probe_hcall_exit, NULL)) {
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unregister_trace_hcall_entry(probe_hcall_entry, NULL);
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return -EINVAL;
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}
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hcall_root = debugfs_create_dir(HCALL_ROOT_DIR, NULL);
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if (!hcall_root)
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return -ENOMEM;
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for_each_possible_cpu(cpu) {
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snprintf(cpu_name_buf, CPU_NAME_BUF_SIZE, "cpu%d", cpu);
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hcall_file = debugfs_create_file(cpu_name_buf, 0444,
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hcall_root,
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per_cpu(hcall_stats, cpu),
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&hcall_inst_seq_fops);
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if (!hcall_file)
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return -ENOMEM;
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}
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return 0;
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}
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machine_device_initcall(pseries, hcall_inst_init);
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