1 /* 2 * Copyright IBM Corp. 2012 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_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 seq_puts(m, "FMB statistics disabled\n"); 50 return 0; 51 } 52 53 /* header */ 54 seq_printf(m, "FMB @ %p\n", zdev->fmb); 55 seq_printf(m, "Update interval: %u ms\n", zdev->fmb_update); 56 seq_printf(m, "Samples: %u\n", zdev->fmb->samples); 57 seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update); 58 59 /* hardware counters */ 60 stat = (u64 *) &zdev->fmb->ld_ops; 61 for (i = 0; i < 4; i++) 62 seq_printf(m, "%26s:\t%llu\n", 63 pci_perf_names[i], *(stat + i)); 64 if (zdev->fmb->dma_valid) 65 for (i = 4; i < 6; i++) 66 seq_printf(m, "%26s:\t%llu\n", 67 pci_perf_names[i], *(stat + i)); 68 /* software counters */ 69 for (i = 6; i < ARRAY_SIZE(pci_perf_names); i++) 70 seq_printf(m, "%26s:\t%llu\n", 71 pci_perf_names[i], 72 atomic64_read((atomic64_t *) (stat + i))); 73 74 return 0; 75 } 76 77 static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf, 78 size_t count, loff_t *off) 79 { 80 struct zpci_dev *zdev = ((struct seq_file *) file->private_data)->private; 81 unsigned long val; 82 int rc; 83 84 if (!zdev) 85 return 0; 86 87 rc = kstrtoul_from_user(ubuf, count, 10, &val); 88 if (rc) 89 return rc; 90 91 switch (val) { 92 case 0: 93 rc = zpci_fmb_disable_device(zdev); 94 if (rc) 95 return rc; 96 break; 97 case 1: 98 rc = zpci_fmb_enable_device(zdev); 99 if (rc) 100 return rc; 101 break; 102 } 103 return count; 104 } 105 106 static int pci_perf_seq_open(struct inode *inode, struct file *filp) 107 { 108 return single_open(filp, pci_perf_show, 109 file_inode(filp)->i_private); 110 } 111 112 static const struct file_operations debugfs_pci_perf_fops = { 113 .open = pci_perf_seq_open, 114 .read = seq_read, 115 .write = pci_perf_seq_write, 116 .llseek = seq_lseek, 117 .release = single_release, 118 }; 119 120 void zpci_debug_init_device(struct zpci_dev *zdev) 121 { 122 zdev->debugfs_dev = debugfs_create_dir(dev_name(&zdev->pdev->dev), 123 debugfs_root); 124 if (IS_ERR(zdev->debugfs_dev)) 125 zdev->debugfs_dev = NULL; 126 127 zdev->debugfs_perf = debugfs_create_file("statistics", 128 S_IFREG | S_IRUGO | S_IWUSR, 129 zdev->debugfs_dev, zdev, 130 &debugfs_pci_perf_fops); 131 if (IS_ERR(zdev->debugfs_perf)) 132 zdev->debugfs_perf = NULL; 133 } 134 135 void zpci_debug_exit_device(struct zpci_dev *zdev) 136 { 137 debugfs_remove(zdev->debugfs_perf); 138 debugfs_remove(zdev->debugfs_dev); 139 } 140 141 int __init zpci_debug_init(void) 142 { 143 /* event trace buffer */ 144 pci_debug_msg_id = debug_register("pci_msg", 8, 1, 8 * sizeof(long)); 145 if (!pci_debug_msg_id) 146 return -EINVAL; 147 debug_register_view(pci_debug_msg_id, &debug_sprintf_view); 148 debug_set_level(pci_debug_msg_id, 3); 149 150 /* error log */ 151 pci_debug_err_id = debug_register("pci_error", 2, 1, 16); 152 if (!pci_debug_err_id) 153 return -EINVAL; 154 debug_register_view(pci_debug_err_id, &debug_hex_ascii_view); 155 debug_set_level(pci_debug_err_id, 6); 156 157 debugfs_root = debugfs_create_dir("pci", NULL); 158 return 0; 159 } 160 161 void zpci_debug_exit(void) 162 { 163 debug_unregister(pci_debug_msg_id); 164 debug_unregister(pci_debug_err_id); 165 debugfs_remove(debugfs_root); 166 } 167