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