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_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_dev *zdev = m->private;
  75         struct zpci_iommu_ctrs *ctrs;
  76         atomic64_t *counter;
  77         unsigned long flags;
  78         int i;
  79
  80         spin_lock_irqsave(&zdev->dom_lock, flags);
  81         ctrs = zpci_get_iommu_ctrs(m->private);
  82         if (!ctrs)
  83                 goto unlock;
  84
  85         counter = &ctrs->mapped_pages;
  86         for (i = 0; i < ARRAY_SIZE(pci_sw_names); i++, counter++)
  87                 seq_printf(m, "%26s:\t%llu\n", pci_sw_names[i],
  88                            atomic64_read(counter));
  89 unlock:
  90         spin_unlock_irqrestore(&zdev->dom_lock, flags);
  91 }
  92
  93 static int pci_perf_show(struct seq_file *m, void *v)
  94 {
  95         struct zpci_dev *zdev = m->private;
  96
  97         if (!zdev)
  98                 return 0;
  99
 100         mutex_lock(&zdev->fmb_lock);
 101         if (!zdev->fmb) {
 102                 mutex_unlock(&zdev->fmb_lock);
 103                 seq_puts(m, "FMB statistics disabled\n");
 104                 return 0;
 105         }
 106
 107         /* header */
 108         seq_printf(m, "Update interval: %u ms\n", zdev->fmb_update);
 109         seq_printf(m, "Samples: %u\n", zdev->fmb->samples);
 110         seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update);
 111
 112         pci_fmb_show(m, pci_common_names, ARRAY_SIZE(pci_common_names),
 113                      &zdev->fmb->ld_ops);
 114
 115         switch (zdev->fmb->format) {
 116         case 0:
 117                 if (!(zdev->fmb->fmt_ind & ZPCI_FMB_DMA_COUNTER_VALID))
 118                         break;
 119                 pci_fmb_show(m, pci_fmt0_names, ARRAY_SIZE(pci_fmt0_names),
 120                              &zdev->fmb->fmt0.dma_rbytes);
 121                 break;
 122         case 1:
 123                 pci_fmb_show(m, pci_fmt1_names, ARRAY_SIZE(pci_fmt1_names),
 124                              &zdev->fmb->fmt1.rx_bytes);
 125                 break;
 126         case 2:
 127                 pci_fmb_show(m, pci_fmt2_names, ARRAY_SIZE(pci_fmt2_names),
 128                              &zdev->fmb->fmt2.consumed_work_units);
 129                 break;
 130         case 3:
 131                 pci_fmb_show(m, pci_fmt3_names, ARRAY_SIZE(pci_fmt3_names),
 132                              &zdev->fmb->fmt3.tx_bytes);
 133                 break;
 134         default:
 135                 seq_puts(m, "Unknown format\n");
 136         }
 137
 138         pci_sw_counter_show(m);
 139         mutex_unlock(&zdev->fmb_lock);
 140         return 0;
 141 }
 142
 143 static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf,
 144                                   size_t count, loff_t *off)
 145 {
 146         struct zpci_dev *zdev = ((struct seq_file *) file->private_data)->private;
 147         unsigned long val;
 148         int rc;
 149
 150         if (!zdev)
 151                 return 0;
 152
 153         rc = kstrtoul_from_user(ubuf, count, 10, &val);
 154         if (rc)
 155                 return rc;
 156
 157         mutex_lock(&zdev->fmb_lock);
 158         switch (val) {
 159         case 0:
 160                 rc = zpci_fmb_disable_device(zdev);
 161                 break;
 162         case 1:
 163                 rc = zpci_fmb_enable_device(zdev);
 164                 break;
 165         }
 166         mutex_unlock(&zdev->fmb_lock);
 167         return rc ? rc : count;
 168 }
 169
 170 static int pci_perf_seq_open(struct inode *inode, struct file *filp)
 171 {
 172         return single_open(filp, pci_perf_show,
 173                            file_inode(filp)->i_private);
 174 }
 175
 176 static const struct file_operations debugfs_pci_perf_fops = {
 177         .open    = pci_perf_seq_open,
 178         .read    = seq_read,
 179         .write   = pci_perf_seq_write,
 180         .llseek  = seq_lseek,
 181         .release = single_release,
 182 };
 183
 184 void zpci_debug_init_device(struct zpci_dev *zdev, const char *name)
 185 {
 186         zdev->debugfs_dev = debugfs_create_dir(name, debugfs_root);
 187
 188         debugfs_create_file("statistics", S_IFREG | S_IRUGO | S_IWUSR,
 189                             zdev->debugfs_dev, zdev, &debugfs_pci_perf_fops);
 190 }
 191
 192 void zpci_debug_exit_device(struct zpci_dev *zdev)
 193 {
 194         debugfs_remove_recursive(zdev->debugfs_dev);
 195 }
 196
 197 int __init zpci_debug_init(void)
 198 {
 199         /* event trace buffer */
 200         pci_debug_msg_id = debug_register("pci_msg", 8, 1, 8 * sizeof(long));
 201         if (!pci_debug_msg_id)
 202                 return -EINVAL;
 203         debug_register_view(pci_debug_msg_id, &debug_sprintf_view);
 204         debug_set_level(pci_debug_msg_id, 3);
 205
 206         /* error log */
 207         pci_debug_err_id = debug_register("pci_error", 2, 1, 16);
 208         if (!pci_debug_err_id)
 209                 return -EINVAL;
 210         debug_register_view(pci_debug_err_id, &debug_hex_ascii_view);
 211         debug_set_level(pci_debug_err_id, 3);
 212
 213         debugfs_root = debugfs_create_dir("pci", NULL);
 214         return 0;
 215 }
 216
 217 void zpci_debug_exit(void)
 218 {
 219         debug_unregister(pci_debug_msg_id);
 220         debug_unregister(pci_debug_err_id);
 221         debugfs_remove(debugfs_root);
 222 }