arch/s390/pci/pci_debug.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  Copyright IBM Corp. 2012,2015
   4  *
   5  *  Author(s):
   6  *    Jan Glauber <jang@linux.vnet.ibm.com>
   7  */
   8
   9 #define KMSG_COMPONENT "zpci"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include <linux/kernel.h>
  13 #include <linux/seq_file.h>
  14 #include <linux/debugfs.h>
  15 #include <linux/export.h>
  16 #include <linux/pci.h>
  17 #include <asm/debug.h>
  18
  19 #include <asm/pci_dma.h>
  20
  21 static struct dentry *debugfs_root;
  22 debug_info_t *pci_debug_msg_id;
  23 EXPORT_SYMBOL_GPL(pci_debug_msg_id);
  24 debug_info_t *pci_debug_err_id;
  25 EXPORT_SYMBOL_GPL(pci_debug_err_id);
  26
  27 static char *pci_common_names[] = {
  28         "Load operations",
  29         "Store operations",
  30         "Store block operations",
  31         "Refresh operations",
  32 };
  33
  34 static char *pci_fmt0_names[] = {
  35         "DMA read bytes",
  36         "DMA write bytes",
  37 };
  38
  39 static char *pci_fmt1_names[] = {
  40         "Received bytes",
  41         "Received packets",
  42         "Transmitted bytes",
  43         "Transmitted packets",
  44 };
  45
  46 static char *pci_fmt2_names[] = {
  47         "Consumed work units",
  48         "Maximum work units",
  49 };
  50
  51 static char *pci_sw_names[] = {
  52         "Allocated pages",
  53         "Mapped pages",
  54         "Unmapped pages",
  55 };
  56
  57 static void pci_fmb_show(struct seq_file *m, char *name[], int length,
  58                          u64 *data)
  59 {
  60         int i;
  61
  62         for (i = 0; i < length; i++, data++)
  63                 seq_printf(m, "%26s:\t%llu\n", name[i], *data);
  64 }
  65
  66 static void pci_sw_counter_show(struct seq_file *m)
  67 {
  68         struct zpci_dev *zdev = m->private;
  69         atomic64_t *counter = &zdev->allocated_pages;
  70         int i;
  71
  72         for (i = 0; i < ARRAY_SIZE(pci_sw_names); i++, counter++)
  73                 seq_printf(m, "%26s:\t%lu\n", pci_sw_names[i],
  74                            atomic64_read(counter));
  75 }
  76
  77 static int pci_perf_show(struct seq_file *m, void *v)
  78 {
  79         struct zpci_dev *zdev = m->private;
  80
  81         if (!zdev)
  82                 return 0;
  83
  84         mutex_lock(&zdev->lock);
  85         if (!zdev->fmb) {
  86                 mutex_unlock(&zdev->lock);
  87                 seq_puts(m, "FMB statistics disabled\n");
  88                 return 0;
  89         }
  90
  91         /* header */
  92         seq_printf(m, "FMB @ %p\n", zdev->fmb);
  93         seq_printf(m, "Update interval: %u ms\n", zdev->fmb_update);
  94         seq_printf(m, "Samples: %u\n", zdev->fmb->samples);
  95         seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update);
  96
  97         pci_fmb_show(m, pci_common_names, ARRAY_SIZE(pci_common_names),
  98                      &zdev->fmb->ld_ops);
  99
 100         switch (zdev->fmb->format) {
 101         case 0:
 102                 if (!(zdev->fmb->fmt_ind & ZPCI_FMB_DMA_COUNTER_VALID))
 103                         break;
 104                 pci_fmb_show(m, pci_fmt0_names, ARRAY_SIZE(pci_fmt0_names),
 105                              &zdev->fmb->fmt0.dma_rbytes);
 106                 break;
 107         case 1:
 108                 pci_fmb_show(m, pci_fmt1_names, ARRAY_SIZE(pci_fmt1_names),
 109                              &zdev->fmb->fmt1.rx_bytes);
 110                 break;
 111         case 2:
 112                 pci_fmb_show(m, pci_fmt2_names, ARRAY_SIZE(pci_fmt2_names),
 113                              &zdev->fmb->fmt2.consumed_work_units);
 114                 break;
 115         default:
 116                 seq_puts(m, "Unknown format\n");
 117         }
 118
 119         pci_sw_counter_show(m);
 120         mutex_unlock(&zdev->lock);
 121         return 0;
 122 }
 123
 124 static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf,
 125                                   size_t count, loff_t *off)
 126 {
 127         struct zpci_dev *zdev = ((struct seq_file *) file->private_data)->private;
 128         unsigned long val;
 129         int rc;
 130
 131         if (!zdev)
 132                 return 0;
 133
 134         rc = kstrtoul_from_user(ubuf, count, 10, &val);
 135         if (rc)
 136                 return rc;
 137
 138         mutex_lock(&zdev->lock);
 139         switch (val) {
 140         case 0:
 141                 rc = zpci_fmb_disable_device(zdev);
 142                 break;
 143         case 1:
 144                 rc = zpci_fmb_enable_device(zdev);
 145                 break;
 146         }
 147         mutex_unlock(&zdev->lock);
 148         return rc ? rc : count;
 149 }
 150
 151 static int pci_perf_seq_open(struct inode *inode, struct file *filp)
 152 {
 153         return single_open(filp, pci_perf_show,
 154                            file_inode(filp)->i_private);
 155 }
 156
 157 static const struct file_operations debugfs_pci_perf_fops = {
 158         .open    = pci_perf_seq_open,
 159         .read    = seq_read,
 160         .write   = pci_perf_seq_write,
 161         .llseek  = seq_lseek,
 162         .release = single_release,
 163 };
 164
 165 void zpci_debug_init_device(struct zpci_dev *zdev, const char *name)
 166 {
 167         zdev->debugfs_dev = debugfs_create_dir(name, debugfs_root);
 168         if (IS_ERR(zdev->debugfs_dev))
 169                 zdev->debugfs_dev = NULL;
 170
 171         zdev->debugfs_perf = debugfs_create_file("statistics",
 172                                 S_IFREG | S_IRUGO | S_IWUSR,
 173                                 zdev->debugfs_dev, zdev,
 174                                 &debugfs_pci_perf_fops);
 175         if (IS_ERR(zdev->debugfs_perf))
 176                 zdev->debugfs_perf = NULL;
 177 }
 178
 179 void zpci_debug_exit_device(struct zpci_dev *zdev)
 180 {
 181         debugfs_remove(zdev->debugfs_perf);
 182         debugfs_remove(zdev->debugfs_dev);
 183 }
 184
 185 int __init zpci_debug_init(void)
 186 {
 187         /* event trace buffer */
 188         pci_debug_msg_id = debug_register("pci_msg", 8, 1, 8 * sizeof(long));
 189         if (!pci_debug_msg_id)
 190                 return -EINVAL;
 191         debug_register_view(pci_debug_msg_id, &debug_sprintf_view);
 192         debug_set_level(pci_debug_msg_id, 3);
 193
 194         /* error log */
 195         pci_debug_err_id = debug_register("pci_error", 2, 1, 16);
 196         if (!pci_debug_err_id)
 197                 return -EINVAL;
 198         debug_register_view(pci_debug_err_id, &debug_hex_ascii_view);
 199         debug_set_level(pci_debug_err_id, 6);
 200
 201         debugfs_root = debugfs_create_dir("pci", NULL);
 202         return 0;
 203 }
 204
 205 void zpci_debug_exit(void)
 206 {
 207         debug_unregister(pci_debug_msg_id);
 208         debug_unregister(pci_debug_err_id);
 209         debugfs_remove(debugfs_root);
 210 }