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Linux/arch/s390/pci/pci_debug.c

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

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