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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/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_perf_names[] = {
 27         /* hardware counters */
 28         "Load operations",
 29         "Store operations",
 30         "Store block operations",
 31         "Refresh operations",
 32         "DMA read bytes",
 33         "DMA write bytes",
 34         /* software counters */
 35         "Allocated pages",
 36         "Mapped pages",
 37         "Unmapped pages",
 38 };
 39 
 40 static int pci_perf_show(struct seq_file *m, void *v)
 41 {
 42         struct zpci_dev *zdev = m->private;
 43         u64 *stat;
 44         int i;
 45 
 46         if (!zdev)
 47                 return 0;
 48         if (!zdev->fmb)
 49                 return seq_printf(m, "FMB statistics disabled\n");
 50 
 51         /* header */
 52         seq_printf(m, "FMB @ %p\n", zdev->fmb);
 53         seq_printf(m, "Update interval: %u ms\n", zdev->fmb_update);
 54         seq_printf(m, "Samples: %u\n", zdev->fmb->samples);
 55         seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update);
 56 
 57         /* hardware counters */
 58         stat = (u64 *) &zdev->fmb->ld_ops;
 59         for (i = 0; i < 4; i++)
 60                 seq_printf(m, "%26s:\t%llu\n",
 61                            pci_perf_names[i], *(stat + i));
 62         if (zdev->fmb->dma_valid)
 63                 for (i = 4; i < 6; i++)
 64                         seq_printf(m, "%26s:\t%llu\n",
 65                                    pci_perf_names[i], *(stat + i));
 66         /* software counters */
 67         for (i = 6; i < ARRAY_SIZE(pci_perf_names); i++)
 68                 seq_printf(m, "%26s:\t%llu\n",
 69                            pci_perf_names[i],
 70                            atomic64_read((atomic64_t *) (stat + i)));
 71 
 72         return 0;
 73 }
 74 
 75 static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf,
 76                                   size_t count, loff_t *off)
 77 {
 78         struct zpci_dev *zdev = ((struct seq_file *) file->private_data)->private;
 79         unsigned long val;
 80         int rc;
 81 
 82         if (!zdev)
 83                 return 0;
 84 
 85         rc = kstrtoul_from_user(ubuf, count, 10, &val);
 86         if (rc)
 87                 return rc;
 88 
 89         switch (val) {
 90         case 0:
 91                 rc = zpci_fmb_disable_device(zdev);
 92                 if (rc)
 93                         return rc;
 94                 break;
 95         case 1:
 96                 rc = zpci_fmb_enable_device(zdev);
 97                 if (rc)
 98                         return rc;
 99                 break;
100         }
101         return count;
102 }
103 
104 static int pci_perf_seq_open(struct inode *inode, struct file *filp)
105 {
106         return single_open(filp, pci_perf_show,
107                            file_inode(filp)->i_private);
108 }
109 
110 static const struct file_operations debugfs_pci_perf_fops = {
111         .open    = pci_perf_seq_open,
112         .read    = seq_read,
113         .write   = pci_perf_seq_write,
114         .llseek  = seq_lseek,
115         .release = single_release,
116 };
117 
118 static int pci_debug_show(struct seq_file *m, void *v)
119 {
120         struct zpci_dev *zdev = m->private;
121 
122         zpci_debug_info(zdev, m);
123         return 0;
124 }
125 
126 static int pci_debug_seq_open(struct inode *inode, struct file *filp)
127 {
128         return single_open(filp, pci_debug_show,
129                            file_inode(filp)->i_private);
130 }
131 
132 static const struct file_operations debugfs_pci_debug_fops = {
133         .open    = pci_debug_seq_open,
134         .read    = seq_read,
135         .llseek  = seq_lseek,
136         .release = single_release,
137 };
138 
139 void zpci_debug_init_device(struct zpci_dev *zdev)
140 {
141         zdev->debugfs_dev = debugfs_create_dir(dev_name(&zdev->pdev->dev),
142                                                debugfs_root);
143         if (IS_ERR(zdev->debugfs_dev))
144                 zdev->debugfs_dev = NULL;
145 
146         zdev->debugfs_perf = debugfs_create_file("statistics",
147                                 S_IFREG | S_IRUGO | S_IWUSR,
148                                 zdev->debugfs_dev, zdev,
149                                 &debugfs_pci_perf_fops);
150         if (IS_ERR(zdev->debugfs_perf))
151                 zdev->debugfs_perf = NULL;
152 
153         zdev->debugfs_debug = debugfs_create_file("debug",
154                                 S_IFREG | S_IRUGO | S_IWUSR,
155                                 zdev->debugfs_dev, zdev,
156                                 &debugfs_pci_debug_fops);
157         if (IS_ERR(zdev->debugfs_debug))
158                 zdev->debugfs_debug = NULL;
159 }
160 
161 void zpci_debug_exit_device(struct zpci_dev *zdev)
162 {
163         debugfs_remove(zdev->debugfs_perf);
164         debugfs_remove(zdev->debugfs_debug);
165         debugfs_remove(zdev->debugfs_dev);
166 }
167 
168 int __init zpci_debug_init(void)
169 {
170         /* event trace buffer */
171         pci_debug_msg_id = debug_register("pci_msg", 16, 1, 16 * sizeof(long));
172         if (!pci_debug_msg_id)
173                 return -EINVAL;
174         debug_register_view(pci_debug_msg_id, &debug_sprintf_view);
175         debug_set_level(pci_debug_msg_id, 3);
176 
177         /* error log */
178         pci_debug_err_id = debug_register("pci_error", 2, 1, 16);
179         if (!pci_debug_err_id)
180                 return -EINVAL;
181         debug_register_view(pci_debug_err_id, &debug_hex_ascii_view);
182         debug_set_level(pci_debug_err_id, 6);
183 
184         debugfs_root = debugfs_create_dir("pci", NULL);
185         return 0;
186 }
187 
188 void zpci_debug_exit(void)
189 {
190         if (pci_debug_msg_id)
191                 debug_unregister(pci_debug_msg_id);
192         if (pci_debug_err_id)
193                 debug_unregister(pci_debug_err_id);
194 
195         debugfs_remove(debugfs_root);
196 }
197 

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