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