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