arch/s390/pci/pci_debug.c

   1 /*
   2  *  Copyright IBM Corp. 2012
   3  *
   4  *  Author(s):
   5  *    Jan Glauber <jang@linux.vnet.ibm.com>
   6  */
   7
   8 #define COMPONENT "zPCI"
   9 #define pr_fmt(fmt) COMPONENT ": " fmt
  10
  11 #include <linux/kernel.h>
  12 #include <linux/seq_file.h>
  13 #include <linux/debugfs.h>
  14 #include <linux/export.h>
  15 #include <linux/pci.h>
  16 #include <asm/debug.h>
  17
  18 #include <asm/pci_dma.h>
  19
  20 static struct dentry *debugfs_root;
  21 debug_info_t *pci_debug_msg_id;
  22 EXPORT_SYMBOL_GPL(pci_debug_msg_id);
  23 debug_info_t *pci_debug_err_id;
  24 EXPORT_SYMBOL_GPL(pci_debug_err_id);
  25
  26 static char *pci_perf_names[] = {
  27         /* hardware counters */
  28         "Load operations",
  29         "Store operations",
  30         "Store block operations",
  31         "Refresh operations",
  32         "DMA read bytes",
  33         "DMA write bytes",
  34         /* software counters */
  35         "Allocated pages",
  36         "Mapped pages",
  37         "Unmapped pages",
  38 };
  39
  40 static int pci_perf_show(struct seq_file *m, void *v)
  41 {
  42         struct zpci_dev *zdev = m->private;
  43         u64 *stat;
  44         int i;
  45
  46         if (!zdev)
  47                 return 0;
  48         if (!zdev->fmb)
  49                 return seq_printf(m, "FMB statistics disabled\n");
  50
  51         /* header */
  52         seq_printf(m, "FMB @ %p\n", zdev->fmb);
  53         seq_printf(m, "Update interval: %u ms\n", zdev->fmb_update);
  54         seq_printf(m, "Samples: %u\n", zdev->fmb->samples);
  55         seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update);
  56
  57         /* hardware counters */
  58         stat = (u64 *) &zdev->fmb->ld_ops;
  59         for (i = 0; i < 4; i++)
  60                 seq_printf(m, "%26s:\t%llu\n",
  61                            pci_perf_names[i], *(stat + i));
  62         if (zdev->fmb->dma_valid)
  63                 for (i = 4; i < 6; i++)
  64                         seq_printf(m, "%26s:\t%llu\n",
  65                                    pci_perf_names[i], *(stat + i));
  66         /* software counters */
  67         for (i = 6; i < ARRAY_SIZE(pci_perf_names); i++)
  68                 seq_printf(m, "%26s:\t%llu\n",
  69                            pci_perf_names[i],
  70                            atomic64_read((atomic64_t *) (stat + i)));
  71
  72         return 0;
  73 }
  74
  75 static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf,
  76                                   size_t count, loff_t *off)
  77 {
  78         struct zpci_dev *zdev = ((struct seq_file *) file->private_data)->private;
  79         unsigned long val;
  80         int rc;
  81
  82         if (!zdev)
  83                 return 0;
  84
  85         rc = kstrtoul_from_user(ubuf, count, 10, &val);
  86         if (rc)
  87                 return rc;
  88
  89         switch (val) {
  90         case 0:
  91                 rc = zpci_fmb_disable_device(zdev);
  92                 if (rc)
  93                         return rc;
  94                 break;
  95         case 1:
  96                 rc = zpci_fmb_enable_device(zdev);
  97                 if (rc)
  98                         return rc;
  99                 break;
 100         }
 101         return count;
 102 }
 103
 104 static int pci_perf_seq_open(struct inode *inode, struct file *filp)
 105 {
 106         return single_open(filp, pci_perf_show,
 107                            file_inode(filp)->i_private);
 108 }
 109
 110 static const struct file_operations debugfs_pci_perf_fops = {
 111         .open    = pci_perf_seq_open,
 112         .read    = seq_read,
 113         .write   = pci_perf_seq_write,
 114         .llseek  = seq_lseek,
 115         .release = single_release,
 116 };
 117
 118 void zpci_debug_init_device(struct zpci_dev *zdev)
 119 {
 120         zdev->debugfs_dev = debugfs_create_dir(dev_name(&zdev->pdev->dev),
 121                                                debugfs_root);
 122         if (IS_ERR(zdev->debugfs_dev))
 123                 zdev->debugfs_dev = NULL;
 124
 125         zdev->debugfs_perf = debugfs_create_file("statistics",
 126                                 S_IFREG | S_IRUGO | S_IWUSR,
 127                                 zdev->debugfs_dev, zdev,
 128                                 &debugfs_pci_perf_fops);
 129         if (IS_ERR(zdev->debugfs_perf))
 130                 zdev->debugfs_perf = NULL;
 131 }
 132
 133 void zpci_debug_exit_device(struct zpci_dev *zdev)
 134 {
 135         debugfs_remove(zdev->debugfs_perf);
 136         debugfs_remove(zdev->debugfs_dev);
 137 }
 138
 139 int __init zpci_debug_init(void)
 140 {
 141         /* event trace buffer */
 142         pci_debug_msg_id = debug_register("pci_msg", 16, 1, 16 * sizeof(long));
 143         if (!pci_debug_msg_id)
 144                 return -EINVAL;
 145         debug_register_view(pci_debug_msg_id, &debug_sprintf_view);
 146         debug_set_level(pci_debug_msg_id, 3);
 147
 148         /* error log */
 149         pci_debug_err_id = debug_register("pci_error", 2, 1, 16);
 150         if (!pci_debug_err_id)
 151                 return -EINVAL;
 152         debug_register_view(pci_debug_err_id, &debug_hex_ascii_view);
 153         debug_set_level(pci_debug_err_id, 6);
 154
 155         debugfs_root = debugfs_create_dir("pci", NULL);
 156         return 0;
 157 }
 158
 159 void zpci_debug_exit(void)
 160 {
 161         if (pci_debug_msg_id)
 162                 debug_unregister(pci_debug_msg_id);
 163         if (pci_debug_err_id)
 164                 debug_unregister(pci_debug_err_id);
 165
 166         debugfs_remove(debugfs_root);
 167 }