drivers/s390/cio/qdio_perf.c

   1 /*
   2  *  drivers/s390/cio/qdio_perf.c
   3  *
   4  *  Copyright IBM Corp. 2008
   5  *
   6  *  Author: Jan Glauber (jang@linux.vnet.ibm.com)
   7  */
   8 #include <linux/kernel.h>
   9 #include <linux/proc_fs.h>
  10 #include <linux/seq_file.h>
  11 #include <asm/ccwdev.h>
  12
  13 #include "cio.h"
  14 #include "css.h"
  15 #include "device.h"
  16 #include "ioasm.h"
  17 #include "chsc.h"
  18 #include "qdio_debug.h"
  19 #include "qdio_perf.h"
  20
  21 int qdio_performance_stats;
  22 struct qdio_perf_stats perf_stats;
  23
  24 #ifdef CONFIG_PROC_FS
  25 static struct proc_dir_entry *qdio_perf_pde;
  26 #endif
  27
  28 inline void qdio_perf_stat_inc(atomic_long_t *count)
  29 {
  30         if (qdio_performance_stats)
  31                 atomic_long_inc(count);
  32 }
  33
  34 inline void qdio_perf_stat_dec(atomic_long_t *count)
  35 {
  36         if (qdio_performance_stats)
  37                 atomic_long_dec(count);
  38 }
  39
  40 /*
  41  * procfs functions
  42  */
  43 static int qdio_perf_proc_show(struct seq_file *m, void *v)
  44 {
  45         seq_printf(m, "Number of qdio interrupts\t\t\t: %li\n",
  46                    (long)atomic_long_read(&perf_stats.qdio_int));
  47         seq_printf(m, "Number of PCI interrupts\t\t\t: %li\n",
  48                    (long)atomic_long_read(&perf_stats.pci_int));
  49         seq_printf(m, "Number of adapter interrupts\t\t\t: %li\n",
  50                    (long)atomic_long_read(&perf_stats.thin_int));
  51         seq_printf(m, "\n");
  52         seq_printf(m, "Inbound tasklet runs\t\t\t\t: %li\n",
  53                    (long)atomic_long_read(&perf_stats.tasklet_inbound));
  54         seq_printf(m, "Outbound tasklet runs\t\t\t\t: %li\n",
  55                    (long)atomic_long_read(&perf_stats.tasklet_outbound));
  56         seq_printf(m, "Adapter interrupt tasklet runs/loops\t\t: %li/%li\n",
  57                    (long)atomic_long_read(&perf_stats.tasklet_thinint),
  58                    (long)atomic_long_read(&perf_stats.tasklet_thinint_loop));
  59         seq_printf(m, "Adapter interrupt inbound tasklet runs/loops\t: %li/%li\n",
  60                    (long)atomic_long_read(&perf_stats.thinint_inbound),
  61                    (long)atomic_long_read(&perf_stats.thinint_inbound_loop));
  62         seq_printf(m, "\n");
  63         seq_printf(m, "Number of SIGA In issued\t\t\t: %li\n",
  64                    (long)atomic_long_read(&perf_stats.siga_in));
  65         seq_printf(m, "Number of SIGA Out issued\t\t\t: %li\n",
  66                    (long)atomic_long_read(&perf_stats.siga_out));
  67         seq_printf(m, "Number of SIGA Sync issued\t\t\t: %li\n",
  68                    (long)atomic_long_read(&perf_stats.siga_sync));
  69         seq_printf(m, "\n");
  70         seq_printf(m, "Number of inbound transfers\t\t\t: %li\n",
  71                    (long)atomic_long_read(&perf_stats.inbound_handler));
  72         seq_printf(m, "Number of outbound transfers\t\t\t: %li\n",
  73                    (long)atomic_long_read(&perf_stats.outbound_handler));
  74         seq_printf(m, "\n");
  75         seq_printf(m, "Number of fast requeues (outg. SBAL w/o SIGA)\t: %li\n",
  76                    (long)atomic_long_read(&perf_stats.fast_requeue));
  77         seq_printf(m, "Number of outbound tasklet mod_timer calls\t: %li\n",
  78                    (long)atomic_long_read(&perf_stats.debug_tl_out_timer));
  79         seq_printf(m, "Number of stop polling calls\t\t\t: %li\n",
  80                    (long)atomic_long_read(&perf_stats.debug_stop_polling));
  81         seq_printf(m, "AI inbound tasklet loops after stop polling\t: %li\n",
  82                    (long)atomic_long_read(&perf_stats.thinint_inbound_loop2));
  83         seq_printf(m, "\n");
  84         return 0;
  85 }
  86 static int qdio_perf_seq_open(struct inode *inode, struct file *filp)
  87 {
  88         return single_open(filp, qdio_perf_proc_show, NULL);
  89 }
  90
  91 static struct file_operations qdio_perf_proc_fops = {
  92         .owner   = THIS_MODULE,
  93         .open    = qdio_perf_seq_open,
  94         .read    = seq_read,
  95         .llseek  = seq_lseek,
  96         .release = single_release,
  97 };
  98
  99 /*
 100  * sysfs functions
 101  */
 102 static ssize_t qdio_perf_stats_show(struct bus_type *bus, char *buf)
 103 {
 104         return sprintf(buf, "%i\n", qdio_performance_stats ? 1 : 0);
 105 }
 106
 107 static ssize_t qdio_perf_stats_store(struct bus_type *bus,
 108                               const char *buf, size_t count)
 109 {
 110         unsigned long i;
 111
 112         if (strict_strtoul(buf, 16, &i) != 0)
 113                 return -EINVAL;
 114         if ((i != 0) && (i != 1))
 115                 return -EINVAL;
 116         if (i == qdio_performance_stats)
 117                 return count;
 118
 119         qdio_performance_stats = i;
 120         /* reset performance statistics */
 121         if (i == 0)
 122                 memset(&perf_stats, 0, sizeof(struct qdio_perf_stats));
 123         return count;
 124 }
 125
 126 static BUS_ATTR(qdio_performance_stats, 0644, qdio_perf_stats_show,
 127                 qdio_perf_stats_store);
 128
 129 int __init qdio_setup_perf_stats(void)
 130 {
 131         int rc;
 132
 133         rc = bus_create_file(&ccw_bus_type, &bus_attr_qdio_performance_stats);
 134         if (rc)
 135                 return rc;
 136
 137 #ifdef CONFIG_PROC_FS
 138         memset(&perf_stats, 0, sizeof(struct qdio_perf_stats));
 139         qdio_perf_pde = proc_create("qdio_perf", S_IFREG | S_IRUGO,
 140                                     NULL, &qdio_perf_proc_fops);
 141 #endif
 142         return 0;
 143 }
 144
 145 void qdio_remove_perf_stats(void)
 146 {
 147 #ifdef CONFIG_PROC_FS
 148         remove_proc_entry("qdio_perf", NULL);
 149 #endif
 150         bus_remove_file(&ccw_bus_type, &bus_attr_qdio_performance_stats);
 151 }