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