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 KMSG_COMPONENT "zpci"
   9 #define pr_fmt(fmt) KMSG_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 };
  35
  36 static char *pci_sw_names[] = {
  37         "Allocated pages",
  38         "Mapped pages",
  39         "Unmapped pages",
  40 };
  41
  42 static void pci_sw_counter_show(struct seq_file *m)
  43 {
  44         struct zpci_dev *zdev = m->private;
  45         atomic64_t *counter = &zdev->allocated_pages;
  46         int i;
  47
  48         for (i = 0; i < ARRAY_SIZE(pci_sw_names); i++, counter++)
  49                 seq_printf(m, "%26s:\t%llu\n", pci_sw_names[i],
  50                            atomic64_read(counter));
  51 }
  52
  53 static int pci_perf_show(struct seq_file *m, void *v)
  54 {
  55         struct zpci_dev *zdev = m->private;
  56         u64 *stat;
  57         int i;
  58
  59         if (!zdev)
  60                 return 0;
  61
  62         mutex_lock(&zdev->lock);
  63         if (!zdev->fmb) {
  64                 mutex_unlock(&zdev->lock);
  65                 seq_puts(m, "FMB statistics disabled\n");
  66                 return 0;
  67         }
  68
  69         /* header */
  70         seq_printf(m, "FMB @ %p\n", zdev->fmb);
  71         seq_printf(m, "Update interval: %u ms\n", zdev->fmb_update);
  72         seq_printf(m, "Samples: %u\n", zdev->fmb->samples);
  73         seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update);
  74
  75         /* hardware counters */
  76         stat = (u64 *) &zdev->fmb->ld_ops;
  77         for (i = 0; i < 4; i++)
  78                 seq_printf(m, "%26s:\t%llu\n",
  79                            pci_perf_names[i], *(stat + i));
  80         if (zdev->fmb->dma_valid)
  81                 for (i = 4; i < 6; i++)
  82                         seq_printf(m, "%26s:\t%llu\n",
  83                                    pci_perf_names[i], *(stat + i));
  84
  85         pci_sw_counter_show(m);
  86         mutex_unlock(&zdev->lock);
  87         return 0;
  88 }
  89
  90 static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf,
  91                                   size_t count, loff_t *off)
  92 {
  93         struct zpci_dev *zdev = ((struct seq_file *) file->private_data)->private;
  94         unsigned long val;
  95         int rc;
  96
  97         if (!zdev)
  98                 return 0;
  99
 100         rc = kstrtoul_from_user(ubuf, count, 10, &val);
 101         if (rc)
 102                 return rc;
 103
 104         mutex_lock(&zdev->lock);
 105         switch (val) {
 106         case 0:
 107                 rc = zpci_fmb_disable_device(zdev);
 108                 break;
 109         case 1:
 110                 rc = zpci_fmb_enable_device(zdev);
 111                 break;
 112         }
 113         mutex_unlock(&zdev->lock);
 114         return rc ? rc : count;
 115 }
 116
 117 static int pci_perf_seq_open(struct inode *inode, struct file *filp)
 118 {
 119         return single_open(filp, pci_perf_show,
 120                            file_inode(filp)->i_private);
 121 }
 122
 123 static const struct file_operations debugfs_pci_perf_fops = {
 124         .open    = pci_perf_seq_open,
 125         .read    = seq_read,
 126         .write   = pci_perf_seq_write,
 127         .llseek  = seq_lseek,
 128         .release = single_release,
 129 };
 130
 131 void zpci_debug_init_device(struct zpci_dev *zdev)
 132 {
 133         zdev->debugfs_dev = debugfs_create_dir(dev_name(&zdev->pdev->dev),
 134                                                debugfs_root);
 135         if (IS_ERR(zdev->debugfs_dev))
 136                 zdev->debugfs_dev = NULL;
 137
 138         zdev->debugfs_perf = debugfs_create_file("statistics",
 139                                 S_IFREG | S_IRUGO | S_IWUSR,
 140                                 zdev->debugfs_dev, zdev,
 141                                 &debugfs_pci_perf_fops);
 142         if (IS_ERR(zdev->debugfs_perf))
 143                 zdev->debugfs_perf = NULL;
 144 }
 145
 146 void zpci_debug_exit_device(struct zpci_dev *zdev)
 147 {
 148         debugfs_remove(zdev->debugfs_perf);
 149         debugfs_remove(zdev->debugfs_dev);
 150 }
 151
 152 int __init zpci_debug_init(void)
 153 {
 154         /* event trace buffer */
 155         pci_debug_msg_id = debug_register("pci_msg", 8, 1, 8 * sizeof(long));
 156         if (!pci_debug_msg_id)
 157                 return -EINVAL;
 158         debug_register_view(pci_debug_msg_id, &debug_sprintf_view);
 159         debug_set_level(pci_debug_msg_id, 3);
 160
 161         /* error log */
 162         pci_debug_err_id = debug_register("pci_error", 2, 1, 16);
 163         if (!pci_debug_err_id)
 164                 return -EINVAL;
 165         debug_register_view(pci_debug_err_id, &debug_hex_ascii_view);
 166         debug_set_level(pci_debug_err_id, 6);
 167
 168         debugfs_root = debugfs_create_dir("pci", NULL);
 169         return 0;
 170 }
 171
 172 void zpci_debug_exit(void)
 173 {
 174         debug_unregister(pci_debug_msg_id);
 175         debug_unregister(pci_debug_err_id);
 176         debugfs_remove(debugfs_root);
 177 }