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_fmt3_names[] = { 52 "Transmitted bytes", 53 }; 54 55 static char *pci_sw_names[] = { 56 "Allocated pages", 57 "Mapped pages", 58 "Unmapped pages", 59 }; 60 61 static void pci_fmb_show(struct seq_file *m, char *name[], int length, 62 u64 *data) 63 { 64 int i; 65 66 for (i = 0; i < length; i++, data++) 67 seq_printf(m, "%26s:\t%llu\n", name[i], *data); 68 } 69 70 static void pci_sw_counter_show(struct seq_file *m) 71 { 72 struct zpci_dev *zdev = m->private; 73 atomic64_t *counter = &zdev->allocated_pages; 74 int i; 75 76 for (i = 0; i < ARRAY_SIZE(pci_sw_names); i++, counter++) 77 seq_printf(m, "%26s:\t%lu\n", pci_sw_names[i], 78 atomic64_read(counter)); 79 } 80 81 static int pci_perf_show(struct seq_file *m, void *v) 82 { 83 struct zpci_dev *zdev = m->private; 84 85 if (!zdev) 86 return 0; 87 88 mutex_lock(&zdev->lock); 89 if (!zdev->fmb) { 90 mutex_unlock(&zdev->lock); 91 seq_puts(m, "FMB statistics disabled\n"); 92 return 0; 93 } 94 95 /* header */ 96 seq_printf(m, "FMB @ %p\n", zdev->fmb); 97 seq_printf(m, "Update interval: %u ms\n", zdev->fmb_update); 98 seq_printf(m, "Samples: %u\n", zdev->fmb->samples); 99 seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update); 100 101 pci_fmb_show(m, pci_common_names, ARRAY_SIZE(pci_common_names), 102 &zdev->fmb->ld_ops); 103 104 switch (zdev->fmb->format) { 105 case 0: 106 if (!(zdev->fmb->fmt_ind & ZPCI_FMB_DMA_COUNTER_VALID)) 107 break; 108 pci_fmb_show(m, pci_fmt0_names, ARRAY_SIZE(pci_fmt0_names), 109 &zdev->fmb->fmt0.dma_rbytes); 110 break; 111 case 1: 112 pci_fmb_show(m, pci_fmt1_names, ARRAY_SIZE(pci_fmt1_names), 113 &zdev->fmb->fmt1.rx_bytes); 114 break; 115 case 2: 116 pci_fmb_show(m, pci_fmt2_names, ARRAY_SIZE(pci_fmt2_names), 117 &zdev->fmb->fmt2.consumed_work_units); 118 break; 119 case 3: 120 pci_fmb_show(m, pci_fmt3_names, ARRAY_SIZE(pci_fmt3_names), 121 &zdev->fmb->fmt3.tx_bytes); 122 break; 123 default: 124 seq_puts(m, "Unknown format\n"); 125 } 126 127 pci_sw_counter_show(m); 128 mutex_unlock(&zdev->lock); 129 return 0; 130 } 131 132 static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf, 133 size_t count, loff_t *off) 134 { 135 struct zpci_dev *zdev = ((struct seq_file *) file->private_data)->private; 136 unsigned long val; 137 int rc; 138 139 if (!zdev) 140 return 0; 141 142 rc = kstrtoul_from_user(ubuf, count, 10, &val); 143 if (rc) 144 return rc; 145 146 mutex_lock(&zdev->lock); 147 switch (val) { 148 case 0: 149 rc = zpci_fmb_disable_device(zdev); 150 break; 151 case 1: 152 rc = zpci_fmb_enable_device(zdev); 153 break; 154 } 155 mutex_unlock(&zdev->lock); 156 return rc ? rc : count; 157 } 158 159 static int pci_perf_seq_open(struct inode *inode, struct file *filp) 160 { 161 return single_open(filp, pci_perf_show, 162 file_inode(filp)->i_private); 163 } 164 165 static const struct file_operations debugfs_pci_perf_fops = { 166 .open = pci_perf_seq_open, 167 .read = seq_read, 168 .write = pci_perf_seq_write, 169 .llseek = seq_lseek, 170 .release = single_release, 171 }; 172 173 void zpci_debug_init_device(struct zpci_dev *zdev, const char *name) 174 { 175 zdev->debugfs_dev = debugfs_create_dir(name, debugfs_root); 176 if (IS_ERR(zdev->debugfs_dev)) 177 zdev->debugfs_dev = NULL; 178 179 zdev->debugfs_perf = debugfs_create_file("statistics", 180 S_IFREG | S_IRUGO | S_IWUSR, 181 zdev->debugfs_dev, zdev, 182 &debugfs_pci_perf_fops); 183 if (IS_ERR(zdev->debugfs_perf)) 184 zdev->debugfs_perf = NULL; 185 } 186 187 void zpci_debug_exit_device(struct zpci_dev *zdev) 188 { 189 debugfs_remove(zdev->debugfs_perf); 190 debugfs_remove(zdev->debugfs_dev); 191 } 192 193 int __init zpci_debug_init(void) 194 { 195 /* event trace buffer */ 196 pci_debug_msg_id = debug_register("pci_msg", 8, 1, 8 * sizeof(long)); 197 if (!pci_debug_msg_id) 198 return -EINVAL; 199 debug_register_view(pci_debug_msg_id, &debug_sprintf_view); 200 debug_set_level(pci_debug_msg_id, 3); 201 202 /* error log */ 203 pci_debug_err_id = debug_register("pci_error", 2, 1, 16); 204 if (!pci_debug_err_id) 205 return -EINVAL; 206 debug_register_view(pci_debug_err_id, &debug_hex_ascii_view); 207 debug_set_level(pci_debug_err_id, 6); 208 209 debugfs_root = debugfs_create_dir("pci", NULL); 210 return 0; 211 } 212 213 void zpci_debug_exit(void) 214 { 215 debug_unregister(pci_debug_msg_id); 216 debug_unregister(pci_debug_err_id); 217 debugfs_remove(debugfs_root); 218 } 219