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_dev *zdev = m->private; 75 struct zpci_iommu_ctrs *ctrs; 76 atomic64_t *counter; 77 unsigned long flags; 78 int i; 79 80 spin_lock_irqsave(&zdev->dom_lock, flags); 81 ctrs = zpci_get_iommu_ctrs(m->private); 82 if (!ctrs) 83 goto unlock; 84 85 counter = &ctrs->mapped_pages; 86 for (i = 0; i < ARRAY_SIZE(pci_sw_names); i++, counter++) 87 seq_printf(m, "%26s:\t%llu\n", pci_sw_names[i], 88 atomic64_read(counter)); 89 unlock: 90 spin_unlock_irqrestore(&zdev->dom_lock, flags); 91 } 92 93 static int pci_perf_show(struct seq_file *m, void *v) 94 { 95 struct zpci_dev *zdev = m->private; 96 97 if (!zdev) 98 return 0; 99 100 mutex_lock(&zdev->fmb_lock); 101 if (!zdev->fmb) { 102 mutex_unlock(&zdev->fmb_lock); 103 seq_puts(m, "FMB statistics disabled\n"); 104 return 0; 105 } 106 107 /* header */ 108 seq_printf(m, "Update interval: %u ms\n", zdev->fmb_update); 109 seq_printf(m, "Samples: %u\n", zdev->fmb->samples); 110 seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update); 111 112 pci_fmb_show(m, pci_common_names, ARRAY_SIZE(pci_common_names), 113 &zdev->fmb->ld_ops); 114 115 switch (zdev->fmb->format) { 116 case 0: 117 if (!(zdev->fmb->fmt_ind & ZPCI_FMB_DMA_COUNTER_VALID)) 118 break; 119 pci_fmb_show(m, pci_fmt0_names, ARRAY_SIZE(pci_fmt0_names), 120 &zdev->fmb->fmt0.dma_rbytes); 121 break; 122 case 1: 123 pci_fmb_show(m, pci_fmt1_names, ARRAY_SIZE(pci_fmt1_names), 124 &zdev->fmb->fmt1.rx_bytes); 125 break; 126 case 2: 127 pci_fmb_show(m, pci_fmt2_names, ARRAY_SIZE(pci_fmt2_names), 128 &zdev->fmb->fmt2.consumed_work_units); 129 break; 130 case 3: 131 pci_fmb_show(m, pci_fmt3_names, ARRAY_SIZE(pci_fmt3_names), 132 &zdev->fmb->fmt3.tx_bytes); 133 break; 134 default: 135 seq_puts(m, "Unknown format\n"); 136 } 137 138 pci_sw_counter_show(m); 139 mutex_unlock(&zdev->fmb_lock); 140 return 0; 141 } 142 143 static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf, 144 size_t count, loff_t *off) 145 { 146 struct zpci_dev *zdev = ((struct seq_file *) file->private_data)->private; 147 unsigned long val; 148 int rc; 149 150 if (!zdev) 151 return 0; 152 153 rc = kstrtoul_from_user(ubuf, count, 10, &val); 154 if (rc) 155 return rc; 156 157 mutex_lock(&zdev->fmb_lock); 158 switch (val) { 159 case 0: 160 rc = zpci_fmb_disable_device(zdev); 161 break; 162 case 1: 163 rc = zpci_fmb_enable_device(zdev); 164 break; 165 } 166 mutex_unlock(&zdev->fmb_lock); 167 return rc ? rc : count; 168 } 169 170 static int pci_perf_seq_open(struct inode *inode, struct file *filp) 171 { 172 return single_open(filp, pci_perf_show, 173 file_inode(filp)->i_private); 174 } 175 176 static const struct file_operations debugfs_pci_perf_fops = { 177 .open = pci_perf_seq_open, 178 .read = seq_read, 179 .write = pci_perf_seq_write, 180 .llseek = seq_lseek, 181 .release = single_release, 182 }; 183 184 void zpci_debug_init_device(struct zpci_dev *zdev, const char *name) 185 { 186 zdev->debugfs_dev = debugfs_create_dir(name, debugfs_root); 187 188 debugfs_create_file("statistics", S_IFREG | S_IRUGO | S_IWUSR, 189 zdev->debugfs_dev, zdev, &debugfs_pci_perf_fops); 190 } 191 192 void zpci_debug_exit_device(struct zpci_dev *zdev) 193 { 194 debugfs_remove_recursive(zdev->debugfs_dev); 195 } 196 197 int __init zpci_debug_init(void) 198 { 199 /* event trace buffer */ 200 pci_debug_msg_id = debug_register("pci_msg", 8, 1, 8 * sizeof(long)); 201 if (!pci_debug_msg_id) 202 return -EINVAL; 203 debug_register_view(pci_debug_msg_id, &debug_sprintf_view); 204 debug_set_level(pci_debug_msg_id, 3); 205 206 /* error log */ 207 pci_debug_err_id = debug_register("pci_error", 2, 1, 16); 208 if (!pci_debug_err_id) 209 return -EINVAL; 210 debug_register_view(pci_debug_err_id, &debug_hex_ascii_view); 211 debug_set_level(pci_debug_err_id, 3); 212 213 debugfs_root = debugfs_create_dir("pci", NULL); 214 return 0; 215 } 216 217 void zpci_debug_exit(void) 218 { 219 debug_unregister(pci_debug_msg_id); 220 debug_unregister(pci_debug_err_id); 221 debugfs_remove(debugfs_root); 222 } 223