arch/s390/pci/pci_debug.c

   1 /*
   2  *  Copyright IBM Corp. 2012,2015
   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_common_names[] = {
  27         "Load operations",
  28         "Store operations",
  29         "Store block operations",
  30         "Refresh operations",
  31 };
  32
  33 static char *pci_fmt0_names[] = {
  34         "DMA read bytes",
  35         "DMA write bytes",
  36 };
  37
  38 static char *pci_fmt1_names[] = {
  39         "Received bytes",
  40         "Received packets",
  41         "Transmitted bytes",
  42         "Transmitted packets",
  43 };
  44
  45 static char *pci_fmt2_names[] = {
  46         "Consumed work units",
  47         "Maximum work units",
  48 };
  49
  50 static char *pci_sw_names[] = {
  51         "Allocated pages",
  52         "Mapped pages",
  53         "Unmapped pages",
  54 };
  55
  56 static void pci_fmb_show(struct seq_file *m, char *name[], int length,
  57                          u64 *data)
  58 {
  59         int i;
  60
  61         for (i = 0; i < length; i++, data++)
  62                 seq_printf(m, "%26s:\t%llu\n", name[i], *data);
  63 }
  64
  65 static void pci_sw_counter_show(struct seq_file *m)
  66 {
  67         struct zpci_dev *zdev = m->private;
  68         atomic64_t *counter = &zdev->allocated_pages;
  69         int i;
  70
  71         for (i = 0; i < ARRAY_SIZE(pci_sw_names); i++, counter++)
  72                 seq_printf(m, "%26s:\t%lu\n", pci_sw_names[i],
  73                            atomic64_read(counter));
  74 }
  75
  76 static int pci_perf_show(struct seq_file *m, void *v)
  77 {
  78         struct zpci_dev *zdev = m->private;
  79
  80         if (!zdev)
  81                 return 0;
  82
  83         mutex_lock(&zdev->lock);
  84         if (!zdev->fmb) {
  85                 mutex_unlock(&zdev->lock);
  86                 seq_puts(m, "FMB statistics disabled\n");
  87                 return 0;
  88         }
  89
  90         /* header */
  91         seq_printf(m, "FMB @ %p\n", zdev->fmb);
  92         seq_printf(m, "Update interval: %u ms\n", zdev->fmb_update);
  93         seq_printf(m, "Samples: %u\n", zdev->fmb->samples);
  94         seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update);
  95
  96         pci_fmb_show(m, pci_common_names, ARRAY_SIZE(pci_common_names),
  97                      &zdev->fmb->ld_ops);
  98
  99         switch (zdev->fmb->format) {
 100         case 0:
 101                 if (!(zdev->fmb->fmt_ind & ZPCI_FMB_DMA_COUNTER_VALID))
 102                         break;
 103                 pci_fmb_show(m, pci_fmt0_names, ARRAY_SIZE(pci_fmt0_names),
 104                              &zdev->fmb->fmt0.dma_rbytes);
 105                 break;
 106         case 1:
 107                 pci_fmb_show(m, pci_fmt1_names, ARRAY_SIZE(pci_fmt1_names),
 108                              &zdev->fmb->fmt1.rx_bytes);
 109                 break;
 110         case 2:
 111                 pci_fmb_show(m, pci_fmt2_names, ARRAY_SIZE(pci_fmt2_names),
 112                              &zdev->fmb->fmt2.consumed_work_units);
 113                 break;
 114         default:
 115                 seq_puts(m, "Unknown format\n");
 116         }
 117
 118         pci_sw_counter_show(m);
 119         mutex_unlock(&zdev->lock);
 120         return 0;
 121 }
 122
 123 static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf,
 124                                   size_t count, loff_t *off)
 125 {
 126         struct zpci_dev *zdev = ((struct seq_file *) file->private_data)->private;
 127         unsigned long val;
 128         int rc;
 129
 130         if (!zdev)
 131                 return 0;
 132
 133         rc = kstrtoul_from_user(ubuf, count, 10, &val);
 134         if (rc)
 135                 return rc;
 136
 137         mutex_lock(&zdev->lock);
 138         switch (val) {
 139         case 0:
 140                 rc = zpci_fmb_disable_device(zdev);
 141                 break;
 142         case 1:
 143                 rc = zpci_fmb_enable_device(zdev);
 144                 break;
 145         }
 146         mutex_unlock(&zdev->lock);
 147         return rc ? rc : count;
 148 }
 149
 150 static int pci_perf_seq_open(struct inode *inode, struct file *filp)
 151 {
 152         return single_open(filp, pci_perf_show,
 153                            file_inode(filp)->i_private);
 154 }
 155
 156 static const struct file_operations debugfs_pci_perf_fops = {
 157         .open    = pci_perf_seq_open,
 158         .read    = seq_read,
 159         .write   = pci_perf_seq_write,
 160         .llseek  = seq_lseek,
 161         .release = single_release,
 162 };
 163
 164 void zpci_debug_init_device(struct zpci_dev *zdev, const char *name)
 165 {
 166         zdev->debugfs_dev = debugfs_create_dir(name, debugfs_root);
 167         if (IS_ERR(zdev->debugfs_dev))
 168                 zdev->debugfs_dev = NULL;
 169
 170         zdev->debugfs_perf = debugfs_create_file("statistics",
 171                                 S_IFREG | S_IRUGO | S_IWUSR,
 172                                 zdev->debugfs_dev, zdev,
 173                                 &debugfs_pci_perf_fops);
 174         if (IS_ERR(zdev->debugfs_perf))
 175                 zdev->debugfs_perf = NULL;
 176 }
 177
 178 void zpci_debug_exit_device(struct zpci_dev *zdev)
 179 {
 180         debugfs_remove(zdev->debugfs_perf);
 181         debugfs_remove(zdev->debugfs_dev);
 182 }
 183
 184 int __init zpci_debug_init(void)
 185 {
 186         /* event trace buffer */
 187         pci_debug_msg_id = debug_register("pci_msg", 8, 1, 8 * sizeof(long));
 188         if (!pci_debug_msg_id)
 189                 return -EINVAL;
 190         debug_register_view(pci_debug_msg_id, &debug_sprintf_view);
 191         debug_set_level(pci_debug_msg_id, 3);
 192
 193         /* error log */
 194         pci_debug_err_id = debug_register("pci_error", 2, 1, 16);
 195         if (!pci_debug_err_id)
 196                 return -EINVAL;
 197         debug_register_view(pci_debug_err_id, &debug_hex_ascii_view);
 198         debug_set_level(pci_debug_err_id, 6);
 199
 200         debugfs_root = debugfs_create_dir("pci", NULL);
 201         return 0;
 202 }
 203
 204 void zpci_debug_exit(void)
 205 {
 206         debug_unregister(pci_debug_msg_id);
 207         debug_unregister(pci_debug_err_id);
 208         debugfs_remove(debugfs_root);
 209 }