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Linux/arch/s390/pci/pci_debug.c

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  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_sw_names[] = {
 52         "Allocated pages",
 53         "Mapped pages",
 54         "Unmapped pages",
 55 };
 56 
 57 static void pci_fmb_show(struct seq_file *m, char *name[], int length,
 58                          u64 *data)
 59 {
 60         int i;
 61 
 62         for (i = 0; i < length; i++, data++)
 63                 seq_printf(m, "%26s:\t%llu\n", name[i], *data);
 64 }
 65 
 66 static void pci_sw_counter_show(struct seq_file *m)
 67 {
 68         struct zpci_dev *zdev = m->private;
 69         atomic64_t *counter = &zdev->allocated_pages;
 70         int i;
 71 
 72         for (i = 0; i < ARRAY_SIZE(pci_sw_names); i++, counter++)
 73                 seq_printf(m, "%26s:\t%lu\n", pci_sw_names[i],
 74                            atomic64_read(counter));
 75 }
 76 
 77 static int pci_perf_show(struct seq_file *m, void *v)
 78 {
 79         struct zpci_dev *zdev = m->private;
 80 
 81         if (!zdev)
 82                 return 0;
 83 
 84         mutex_lock(&zdev->lock);
 85         if (!zdev->fmb) {
 86                 mutex_unlock(&zdev->lock);
 87                 seq_puts(m, "FMB statistics disabled\n");
 88                 return 0;
 89         }
 90 
 91         /* header */
 92         seq_printf(m, "FMB @ %p\n", zdev->fmb);
 93         seq_printf(m, "Update interval: %u ms\n", zdev->fmb_update);
 94         seq_printf(m, "Samples: %u\n", zdev->fmb->samples);
 95         seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update);
 96 
 97         pci_fmb_show(m, pci_common_names, ARRAY_SIZE(pci_common_names),
 98                      &zdev->fmb->ld_ops);
 99 
100         switch (zdev->fmb->format) {
101         case 0:
102                 if (!(zdev->fmb->fmt_ind & ZPCI_FMB_DMA_COUNTER_VALID))
103                         break;
104                 pci_fmb_show(m, pci_fmt0_names, ARRAY_SIZE(pci_fmt0_names),
105                              &zdev->fmb->fmt0.dma_rbytes);
106                 break;
107         case 1:
108                 pci_fmb_show(m, pci_fmt1_names, ARRAY_SIZE(pci_fmt1_names),
109                              &zdev->fmb->fmt1.rx_bytes);
110                 break;
111         case 2:
112                 pci_fmb_show(m, pci_fmt2_names, ARRAY_SIZE(pci_fmt2_names),
113                              &zdev->fmb->fmt2.consumed_work_units);
114                 break;
115         default:
116                 seq_puts(m, "Unknown format\n");
117         }
118 
119         pci_sw_counter_show(m);
120         mutex_unlock(&zdev->lock);
121         return 0;
122 }
123 
124 static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf,
125                                   size_t count, loff_t *off)
126 {
127         struct zpci_dev *zdev = ((struct seq_file *) file->private_data)->private;
128         unsigned long val;
129         int rc;
130 
131         if (!zdev)
132                 return 0;
133 
134         rc = kstrtoul_from_user(ubuf, count, 10, &val);
135         if (rc)
136                 return rc;
137 
138         mutex_lock(&zdev->lock);
139         switch (val) {
140         case 0:
141                 rc = zpci_fmb_disable_device(zdev);
142                 break;
143         case 1:
144                 rc = zpci_fmb_enable_device(zdev);
145                 break;
146         }
147         mutex_unlock(&zdev->lock);
148         return rc ? rc : count;
149 }
150 
151 static int pci_perf_seq_open(struct inode *inode, struct file *filp)
152 {
153         return single_open(filp, pci_perf_show,
154                            file_inode(filp)->i_private);
155 }
156 
157 static const struct file_operations debugfs_pci_perf_fops = {
158         .open    = pci_perf_seq_open,
159         .read    = seq_read,
160         .write   = pci_perf_seq_write,
161         .llseek  = seq_lseek,
162         .release = single_release,
163 };
164 
165 void zpci_debug_init_device(struct zpci_dev *zdev, const char *name)
166 {
167         zdev->debugfs_dev = debugfs_create_dir(name, debugfs_root);
168         if (IS_ERR(zdev->debugfs_dev))
169                 zdev->debugfs_dev = NULL;
170 
171         zdev->debugfs_perf = debugfs_create_file("statistics",
172                                 S_IFREG | S_IRUGO | S_IWUSR,
173                                 zdev->debugfs_dev, zdev,
174                                 &debugfs_pci_perf_fops);
175         if (IS_ERR(zdev->debugfs_perf))
176                 zdev->debugfs_perf = NULL;
177 }
178 
179 void zpci_debug_exit_device(struct zpci_dev *zdev)
180 {
181         debugfs_remove(zdev->debugfs_perf);
182         debugfs_remove(zdev->debugfs_dev);
183 }
184 
185 int __init zpci_debug_init(void)
186 {
187         /* event trace buffer */
188         pci_debug_msg_id = debug_register("pci_msg", 8, 1, 8 * sizeof(long));
189         if (!pci_debug_msg_id)
190                 return -EINVAL;
191         debug_register_view(pci_debug_msg_id, &debug_sprintf_view);
192         debug_set_level(pci_debug_msg_id, 3);
193 
194         /* error log */
195         pci_debug_err_id = debug_register("pci_error", 2, 1, 16);
196         if (!pci_debug_err_id)
197                 return -EINVAL;
198         debug_register_view(pci_debug_err_id, &debug_hex_ascii_view);
199         debug_set_level(pci_debug_err_id, 6);
200 
201         debugfs_root = debugfs_create_dir("pci", NULL);
202         return 0;
203 }
204 
205 void zpci_debug_exit(void)
206 {
207         debug_unregister(pci_debug_msg_id);
208         debug_unregister(pci_debug_err_id);
209         debugfs_remove(debugfs_root);
210 }
211 

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