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Linux/arch/s390/pci/pci_debug.c

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  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/pci.h>
 15 #include <asm/debug.h>
 16 
 17 #include <asm/pci_dma.h>
 18 
 19 static struct dentry *debugfs_root;
 20 
 21 static char *pci_perf_names[] = {
 22         /* hardware counters */
 23         "Load operations",
 24         "Store operations",
 25         "Store block operations",
 26         "Refresh operations",
 27         "DMA read bytes",
 28         "DMA write bytes",
 29         /* software counters */
 30         "Allocated pages",
 31         "Mapped pages",
 32         "Unmapped pages",
 33 };
 34 
 35 static int pci_perf_show(struct seq_file *m, void *v)
 36 {
 37         struct zpci_dev *zdev = m->private;
 38         u64 *stat;
 39         int i;
 40 
 41         if (!zdev)
 42                 return 0;
 43         if (!zdev->fmb)
 44                 return seq_printf(m, "FMB statistics disabled\n");
 45 
 46         /* header */
 47         seq_printf(m, "FMB @ %p\n", zdev->fmb);
 48         seq_printf(m, "Update interval: %u ms\n", zdev->fmb_update);
 49         seq_printf(m, "Samples: %u\n", zdev->fmb->samples);
 50         seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update);
 51 
 52         /* hardware counters */
 53         stat = (u64 *) &zdev->fmb->ld_ops;
 54         for (i = 0; i < 4; i++)
 55                 seq_printf(m, "%26s:\t%llu\n",
 56                            pci_perf_names[i], *(stat + i));
 57         if (zdev->fmb->dma_valid)
 58                 for (i = 4; i < 6; i++)
 59                         seq_printf(m, "%26s:\t%llu\n",
 60                                    pci_perf_names[i], *(stat + i));
 61         /* software counters */
 62         for (i = 6; i < ARRAY_SIZE(pci_perf_names); i++)
 63                 seq_printf(m, "%26s:\t%llu\n",
 64                            pci_perf_names[i],
 65                            atomic64_read((atomic64_t *) (stat + i)));
 66 
 67         return 0;
 68 }
 69 
 70 static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf,
 71                                   size_t count, loff_t *off)
 72 {
 73         struct zpci_dev *zdev = ((struct seq_file *) file->private_data)->private;
 74         unsigned long val;
 75         int rc;
 76 
 77         if (!zdev)
 78                 return 0;
 79 
 80         rc = kstrtoul_from_user(ubuf, count, 10, &val);
 81         if (rc)
 82                 return rc;
 83 
 84         switch (val) {
 85         case 0:
 86                 rc = zpci_fmb_disable_device(zdev);
 87                 if (rc)
 88                         return rc;
 89                 break;
 90         case 1:
 91                 rc = zpci_fmb_enable_device(zdev);
 92                 if (rc)
 93                         return rc;
 94                 break;
 95         }
 96         return count;
 97 }
 98 
 99 static int pci_perf_seq_open(struct inode *inode, struct file *filp)
100 {
101         return single_open(filp, pci_perf_show,
102                            filp->f_path.dentry->d_inode->i_private);
103 }
104 
105 static const struct file_operations debugfs_pci_perf_fops = {
106         .open    = pci_perf_seq_open,
107         .read    = seq_read,
108         .write   = pci_perf_seq_write,
109         .llseek  = seq_lseek,
110         .release = single_release,
111 };
112 
113 static int pci_debug_show(struct seq_file *m, void *v)
114 {
115         struct zpci_dev *zdev = m->private;
116 
117         zpci_debug_info(zdev, m);
118         return 0;
119 }
120 
121 static int pci_debug_seq_open(struct inode *inode, struct file *filp)
122 {
123         return single_open(filp, pci_debug_show,
124                            filp->f_path.dentry->d_inode->i_private);
125 }
126 
127 static const struct file_operations debugfs_pci_debug_fops = {
128         .open    = pci_debug_seq_open,
129         .read    = seq_read,
130         .llseek  = seq_lseek,
131         .release = single_release,
132 };
133 
134 void zpci_debug_init_device(struct zpci_dev *zdev)
135 {
136         zdev->debugfs_dev = debugfs_create_dir(dev_name(&zdev->pdev->dev),
137                                                debugfs_root);
138         if (IS_ERR(zdev->debugfs_dev))
139                 zdev->debugfs_dev = NULL;
140 
141         zdev->debugfs_perf = debugfs_create_file("statistics",
142                                 S_IFREG | S_IRUGO | S_IWUSR,
143                                 zdev->debugfs_dev, zdev,
144                                 &debugfs_pci_perf_fops);
145         if (IS_ERR(zdev->debugfs_perf))
146                 zdev->debugfs_perf = NULL;
147 
148         zdev->debugfs_debug = debugfs_create_file("debug",
149                                 S_IFREG | S_IRUGO | S_IWUSR,
150                                 zdev->debugfs_dev, zdev,
151                                 &debugfs_pci_debug_fops);
152         if (IS_ERR(zdev->debugfs_debug))
153                 zdev->debugfs_debug = NULL;
154 }
155 
156 void zpci_debug_exit_device(struct zpci_dev *zdev)
157 {
158         debugfs_remove(zdev->debugfs_perf);
159         debugfs_remove(zdev->debugfs_debug);
160         debugfs_remove(zdev->debugfs_dev);
161 }
162 
163 int __init zpci_debug_init(void)
164 {
165         /* event trace buffer */
166         pci_debug_msg_id = debug_register("pci_msg", 16, 1, 16 * sizeof(long));
167         if (!pci_debug_msg_id)
168                 return -EINVAL;
169         debug_register_view(pci_debug_msg_id, &debug_sprintf_view);
170         debug_set_level(pci_debug_msg_id, 3);
171         zpci_dbg("Debug view initialized\n");
172 
173         /* error log */
174         pci_debug_err_id = debug_register("pci_error", 2, 1, 16);
175         if (!pci_debug_err_id)
176                 return -EINVAL;
177         debug_register_view(pci_debug_err_id, &debug_hex_ascii_view);
178         debug_set_level(pci_debug_err_id, 6);
179         zpci_err("Debug view initialized\n");
180 
181         debugfs_root = debugfs_create_dir("pci", NULL);
182         return 0;
183 }
184 
185 void zpci_debug_exit(void)
186 {
187         if (pci_debug_msg_id)
188                 debug_unregister(pci_debug_msg_id);
189         if (pci_debug_err_id)
190                 debug_unregister(pci_debug_err_id);
191 
192         debugfs_remove(debugfs_root);
193 }
194 

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