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, "Update interval: %u ms\n", zdev->fmb_update); 97 seq_printf(m, "Samples: %u\n", zdev->fmb->samples); 98 seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update); 99 100 pci_fmb_show(m, pci_common_names, ARRAY_SIZE(pci_common_names), 101 &zdev->fmb->ld_ops); 102 103 switch (zdev->fmb->format) { 104 case 0: 105 if (!(zdev->fmb->fmt_ind & ZPCI_FMB_DMA_COUNTER_VALID)) 106 break; 107 pci_fmb_show(m, pci_fmt0_names, ARRAY_SIZE(pci_fmt0_names), 108 &zdev->fmb->fmt0.dma_rbytes); 109 break; 110 case 1: 111 pci_fmb_show(m, pci_fmt1_names, ARRAY_SIZE(pci_fmt1_names), 112 &zdev->fmb->fmt1.rx_bytes); 113 break; 114 case 2: 115 pci_fmb_show(m, pci_fmt2_names, ARRAY_SIZE(pci_fmt2_names), 116 &zdev->fmb->fmt2.consumed_work_units); 117 break; 118 case 3: 119 pci_fmb_show(m, pci_fmt3_names, ARRAY_SIZE(pci_fmt3_names), 120 &zdev->fmb->fmt3.tx_bytes); 121 break; 122 default: 123 seq_puts(m, "Unknown format\n"); 124 } 125 126 pci_sw_counter_show(m); 127 mutex_unlock(&zdev->lock); 128 return 0; 129 } 130 131 static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf, 132 size_t count, loff_t *off) 133 { 134 struct zpci_dev *zdev = ((struct seq_file *) file->private_data)->private; 135 unsigned long val; 136 int rc; 137 138 if (!zdev) 139 return 0; 140 141 rc = kstrtoul_from_user(ubuf, count, 10, &val); 142 if (rc) 143 return rc; 144 145 mutex_lock(&zdev->lock); 146 switch (val) { 147 case 0: 148 rc = zpci_fmb_disable_device(zdev); 149 break; 150 case 1: 151 rc = zpci_fmb_enable_device(zdev); 152 break; 153 } 154 mutex_unlock(&zdev->lock); 155 return rc ? rc : count; 156 } 157 158 static int pci_perf_seq_open(struct inode *inode, struct file *filp) 159 { 160 return single_open(filp, pci_perf_show, 161 file_inode(filp)->i_private); 162 } 163 164 static const struct file_operations debugfs_pci_perf_fops = { 165 .open = pci_perf_seq_open, 166 .read = seq_read, 167 .write = pci_perf_seq_write, 168 .llseek = seq_lseek, 169 .release = single_release, 170 }; 171 172 void zpci_debug_init_device(struct zpci_dev *zdev, const char *name) 173 { 174 zdev->debugfs_dev = debugfs_create_dir(name, debugfs_root); 175 176 debugfs_create_file("statistics", S_IFREG | S_IRUGO | S_IWUSR, 177 zdev->debugfs_dev, zdev, &debugfs_pci_perf_fops); 178 } 179 180 void zpci_debug_exit_device(struct zpci_dev *zdev) 181 { 182 debugfs_remove_recursive(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