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/pci.h>
  15 #include <asm/debug.h>
  16
  17 #include <asm/pci_dma.h>
  18
  19 static struct dentry *debugfs_root;
  20
  21 static char *pci_perf_names[] = {
  22         /* hardware counters */
  23         "Load operations",
  24         "Store operations",
  25         "Store block operations",
  26         "Refresh operations",
  27         "DMA read bytes",
  28         "DMA write bytes",
  29         /* software counters */
  30         "Allocated pages",
  31         "Mapped pages",
  32         "Unmapped pages",
  33 };
  34
  35 static int pci_perf_show(struct seq_file *m, void *v)
  36 {
  37         struct zpci_dev *zdev = m->private;
  38         u64 *stat;
  39         int i;
  40
  41         if (!zdev)
  42                 return 0;
  43         if (!zdev->fmb)
  44                 return seq_printf(m, "FMB statistics disabled\n");
  45
  46         /* header */
  47         seq_printf(m, "FMB @ %p\n", zdev->fmb);
  48         seq_printf(m, "Update interval: %u ms\n", zdev->fmb_update);
  49         seq_printf(m, "Samples: %u\n", zdev->fmb->samples);
  50         seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update);
  51
  52         /* hardware counters */
  53         stat = (u64 *) &zdev->fmb->ld_ops;
  54         for (i = 0; i < 4; i++)
  55                 seq_printf(m, "%26s:\t%llu\n",
  56                            pci_perf_names[i], *(stat + i));
  57         if (zdev->fmb->dma_valid)
  58                 for (i = 4; i < 6; i++)
  59                         seq_printf(m, "%26s:\t%llu\n",
  60                                    pci_perf_names[i], *(stat + i));
  61         /* software counters */
  62         for (i = 6; i < ARRAY_SIZE(pci_perf_names); i++)
  63                 seq_printf(m, "%26s:\t%llu\n",
  64                            pci_perf_names[i],
  65                            atomic64_read((atomic64_t *) (stat + i)));
  66
  67         return 0;
  68 }
  69
  70 static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf,
  71                                   size_t count, loff_t *off)
  72 {
  73         struct zpci_dev *zdev = ((struct seq_file *) file->private_data)->private;
  74         unsigned long val;
  75         int rc;
  76
  77         if (!zdev)
  78                 return 0;
  79
  80         rc = kstrtoul_from_user(ubuf, count, 10, &val);
  81         if (rc)
  82                 return rc;
  83
  84         switch (val) {
  85         case 0:
  86                 rc = zpci_fmb_disable_device(zdev);
  87                 if (rc)
  88                         return rc;
  89                 break;
  90         case 1:
  91                 rc = zpci_fmb_enable_device(zdev);
  92                 if (rc)
  93                         return rc;
  94                 break;
  95         }
  96         return count;
  97 }
  98
  99 static int pci_perf_seq_open(struct inode *inode, struct file *filp)
 100 {
 101         return single_open(filp, pci_perf_show,
 102                            file_inode(filp)->i_private);
 103 }
 104
 105 static const struct file_operations debugfs_pci_perf_fops = {
 106         .open    = pci_perf_seq_open,
 107         .read    = seq_read,
 108         .write   = pci_perf_seq_write,
 109         .llseek  = seq_lseek,
 110         .release = single_release,
 111 };
 112
 113 static int pci_debug_show(struct seq_file *m, void *v)
 114 {
 115         struct zpci_dev *zdev = m->private;
 116
 117         zpci_debug_info(zdev, m);
 118         return 0;
 119 }
 120
 121 static int pci_debug_seq_open(struct inode *inode, struct file *filp)
 122 {
 123         return single_open(filp, pci_debug_show,
 124                            file_inode(filp)->i_private);
 125 }
 126
 127 static const struct file_operations debugfs_pci_debug_fops = {
 128         .open    = pci_debug_seq_open,
 129         .read    = seq_read,
 130         .llseek  = seq_lseek,
 131         .release = single_release,
 132 };
 133
 134 void zpci_debug_init_device(struct zpci_dev *zdev)
 135 {
 136         zdev->debugfs_dev = debugfs_create_dir(dev_name(&zdev->pdev->dev),
 137                                                debugfs_root);
 138         if (IS_ERR(zdev->debugfs_dev))
 139                 zdev->debugfs_dev = NULL;
 140
 141         zdev->debugfs_perf = debugfs_create_file("statistics",
 142                                 S_IFREG | S_IRUGO | S_IWUSR,
 143                                 zdev->debugfs_dev, zdev,
 144                                 &debugfs_pci_perf_fops);
 145         if (IS_ERR(zdev->debugfs_perf))
 146                 zdev->debugfs_perf = NULL;
 147
 148         zdev->debugfs_debug = debugfs_create_file("debug",
 149                                 S_IFREG | S_IRUGO | S_IWUSR,
 150                                 zdev->debugfs_dev, zdev,
 151                                 &debugfs_pci_debug_fops);
 152         if (IS_ERR(zdev->debugfs_debug))
 153                 zdev->debugfs_debug = NULL;
 154 }
 155
 156 void zpci_debug_exit_device(struct zpci_dev *zdev)
 157 {
 158         debugfs_remove(zdev->debugfs_perf);
 159         debugfs_remove(zdev->debugfs_debug);
 160         debugfs_remove(zdev->debugfs_dev);
 161 }
 162
 163 int __init zpci_debug_init(void)
 164 {
 165         /* event trace buffer */
 166         pci_debug_msg_id = debug_register("pci_msg", 16, 1, 16 * sizeof(long));
 167         if (!pci_debug_msg_id)
 168                 return -EINVAL;
 169         debug_register_view(pci_debug_msg_id, &debug_sprintf_view);
 170         debug_set_level(pci_debug_msg_id, 3);
 171         zpci_dbg("Debug view initialized\n");
 172
 173         /* error log */
 174         pci_debug_err_id = debug_register("pci_error", 2, 1, 16);
 175         if (!pci_debug_err_id)
 176                 return -EINVAL;
 177         debug_register_view(pci_debug_err_id, &debug_hex_ascii_view);
 178         debug_set_level(pci_debug_err_id, 6);
 179         zpci_err("Debug view initialized\n");
 180
 181         debugfs_root = debugfs_create_dir("pci", NULL);
 182         return 0;
 183 }
 184
 185 void zpci_debug_exit(void)
 186 {
 187         if (pci_debug_msg_id)
 188                 debug_unregister(pci_debug_msg_id);
 189         if (pci_debug_err_id)
 190                 debug_unregister(pci_debug_err_id);
 191
 192         debugfs_remove(debugfs_root);
 193 }