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 <[email protected]>
   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_fmt3_names[] = {
  52         "Transmitted bytes",
  53 };
  54
  55 static char *pci_sw_names[] = {
  56         "Mapped pages",
  57         "Unmapped pages",
  58         "Global RPCITs",
  59         "Sync Map RPCITs",
  60         "Sync RPCITs",
  61 };
  62
  63 static void pci_fmb_show(struct seq_file *m, char *name[], int length,
  64                          u64 *data)
  65 {
  66         int i;
  67
  68         for (i = 0; i < length; i++, data++)
  69                 seq_printf(m, "%26s:\t%llu\n", name[i], *data);
  70 }
  71
  72 static void pci_sw_counter_show(struct seq_file *m)
  73 {
  74         struct zpci_iommu_ctrs  *ctrs = zpci_get_iommu_ctrs(m->private);
  75         atomic64_t *counter;
  76         int i;
  77
  78         if (!ctrs)
  79                 return;
  80
  81         counter = &ctrs->mapped_pages;
  82         for (i = 0; i < ARRAY_SIZE(pci_sw_names); i++, counter++)
  83                 seq_printf(m, "%26s:\t%llu\n", pci_sw_names[i],
  84                            atomic64_read(counter));
  85 }
  86
  87 static int pci_perf_show(struct seq_file *m, void *v)
  88 {
  89         struct zpci_dev *zdev = m->private;
  90
  91         if (!zdev)
  92                 return 0;
  93
  94         mutex_lock(&zdev->lock);
  95         if (!zdev->fmb) {
  96                 mutex_unlock(&zdev->lock);
  97                 seq_puts(m, "FMB statistics disabled\n");
  98                 return 0;
  99         }
 100
 101         /* header */
 102         seq_printf(m, "Update interval: %u ms\n", zdev->fmb_update);
 103         seq_printf(m, "Samples: %u\n", zdev->fmb->samples);
 104         seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update);
 105
 106         pci_fmb_show(m, pci_common_names, ARRAY_SIZE(pci_common_names),
 107                      &zdev->fmb->ld_ops);
 108
 109         switch (zdev->fmb->format) {
 110         case 0:
 111                 if (!(zdev->fmb->fmt_ind & ZPCI_FMB_DMA_COUNTER_VALID))
 112                         break;
 113                 pci_fmb_show(m, pci_fmt0_names, ARRAY_SIZE(pci_fmt0_names),
 114                              &zdev->fmb->fmt0.dma_rbytes);
 115                 break;
 116         case 1:
 117                 pci_fmb_show(m, pci_fmt1_names, ARRAY_SIZE(pci_fmt1_names),
 118                              &zdev->fmb->fmt1.rx_bytes);
 119                 break;
 120         case 2:
 121                 pci_fmb_show(m, pci_fmt2_names, ARRAY_SIZE(pci_fmt2_names),
 122                              &zdev->fmb->fmt2.consumed_work_units);
 123                 break;
 124         case 3:
 125                 pci_fmb_show(m, pci_fmt3_names, ARRAY_SIZE(pci_fmt3_names),
 126                              &zdev->fmb->fmt3.tx_bytes);
 127                 break;
 128         default:
 129                 seq_puts(m, "Unknown format\n");
 130         }
 131
 132         pci_sw_counter_show(m);
 133         mutex_unlock(&zdev->lock);
 134         return 0;
 135 }
 136
 137 static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf,
 138                                   size_t count, loff_t *off)
 139 {
 140         struct zpci_dev *zdev = ((struct seq_file *) file->private_data)->private;
 141         unsigned long val;
 142         int rc;
 143
 144         if (!zdev)
 145                 return 0;
 146
 147         rc = kstrtoul_from_user(ubuf, count, 10, &val);
 148         if (rc)
 149                 return rc;
 150
 151         mutex_lock(&zdev->lock);
 152         switch (val) {
 153         case 0:
 154                 rc = zpci_fmb_disable_device(zdev);
 155                 break;
 156         case 1:
 157                 rc = zpci_fmb_enable_device(zdev);
 158                 break;
 159         }
 160         mutex_unlock(&zdev->lock);
 161         return rc ? rc : count;
 162 }
 163
 164 static int pci_perf_seq_open(struct inode *inode, struct file *filp)
 165 {
 166         return single_open(filp, pci_perf_show,
 167                            file_inode(filp)->i_private);
 168 }
 169
 170 static const struct file_operations debugfs_pci_perf_fops = {
 171         .open    = pci_perf_seq_open,
 172         .read    = seq_read,
 173         .write   = pci_perf_seq_write,
 174         .llseek  = seq_lseek,
 175         .release = single_release,
 176 };
 177
 178 void zpci_debug_init_device(struct zpci_dev *zdev, const char *name)
 179 {
 180         zdev->debugfs_dev = debugfs_create_dir(name, debugfs_root);
 181
 182         debugfs_create_file("statistics", S_IFREG | S_IRUGO | S_IWUSR,
 183                             zdev->debugfs_dev, zdev, &debugfs_pci_perf_fops);
 184 }
 185
 186 void zpci_debug_exit_device(struct zpci_dev *zdev)
 187 {
 188         debugfs_remove_recursive(zdev->debugfs_dev);
 189 }
 190
 191 int __init zpci_debug_init(void)
 192 {
 193         /* event trace buffer */
 194         pci_debug_msg_id = debug_register("pci_msg", 8, 1, 8 * sizeof(long));
 195         if (!pci_debug_msg_id)
 196                 return -EINVAL;
 197         debug_register_view(pci_debug_msg_id, &debug_sprintf_view);
 198         debug_set_level(pci_debug_msg_id, 3);
 199
 200         /* error log */
 201         pci_debug_err_id = debug_register("pci_error", 2, 1, 16);
 202         if (!pci_debug_err_id)
 203                 return -EINVAL;
 204         debug_register_view(pci_debug_err_id, &debug_hex_ascii_view);
 205         debug_set_level(pci_debug_err_id, 3);
 206
 207         debugfs_root = debugfs_create_dir("pci", NULL);
 208         return 0;
 209 }
 210
 211 void zpci_debug_exit(void)
 212 {
 213         debug_unregister(pci_debug_msg_id);
 214         debug_unregister(pci_debug_err_id);
 215         debugfs_remove(debugfs_root);
 216 }