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 pr_fmt(fmt) "zpci: " fmt 10 11 #include <linux/kernel.h> 12 #include <linux/seq_file.h> 13 #include <linux/debugfs.h> 14 #include <linux/export.h> 15 #include <linux/pci.h> 16 #include <asm/debug.h> 17 18 #include <asm/pci_dma.h> 19 20 static struct dentry *debugfs_root; 21 debug_info_t *pci_debug_msg_id; 22 EXPORT_SYMBOL_GPL(pci_debug_msg_id); 23 debug_info_t *pci_debug_err_id; 24 EXPORT_SYMBOL_GPL(pci_debug_err_id); 25 26 static char *pci_common_names[] = { 27 "Load operations", 28 "Store operations", 29 "Store block operations", 30 "Refresh operations", 31 }; 32 33 static char *pci_fmt0_names[] = { 34 "DMA read bytes", 35 "DMA write bytes", 36 }; 37 38 static char *pci_fmt1_names[] = { 39 "Received bytes", 40 "Received packets", 41 "Transmitted bytes", 42 "Transmitted packets", 43 }; 44 45 static char *pci_fmt2_names[] = { 46 "Consumed work units", 47 "Maximum work units", 48 }; 49 50 static char *pci_fmt3_names[] = { 51 "Transmitted bytes", 52 }; 53 54 static char *pci_sw_names[] = { 55 "Mapped pages", 56 "Unmapped pages", 57 "Global RPCITs", 58 "Sync Map RPCITs", 59 "Sync RPCITs", 60 }; 61 62 static void pci_fmb_show(struct seq_file *m, char *name[], int length, 63 u64 *data) 64 { 65 int i; 66 67 for (i = 0; i < length; i++, data++) 68 seq_printf(m, "%26s:\t%llu\n", name[i], *data); 69 } 70 71 static void pci_sw_counter_show(struct seq_file *m) 72 { 73 struct zpci_dev *zdev = m->private; 74 struct zpci_iommu_ctrs *ctrs; 75 atomic64_t *counter; 76 unsigned long flags; 77 int i; 78 79 spin_lock_irqsave(&zdev->dom_lock, flags); 80 ctrs = zpci_get_iommu_ctrs(m->private); 81 if (!ctrs) 82 goto unlock; 83 84 counter = &ctrs->mapped_pages; 85 for (i = 0; i < ARRAY_SIZE(pci_sw_names); i++, counter++) 86 seq_printf(m, "%26s:\t%llu\n", pci_sw_names[i], 87 atomic64_read(counter)); 88 unlock: 89 spin_unlock_irqrestore(&zdev->dom_lock, flags); 90 } 91 92 static int pci_perf_show(struct seq_file *m, void *v) 93 { 94 struct zpci_dev *zdev = m->private; 95 96 if (!zdev) 97 return 0; 98 99 mutex_lock(&zdev->fmb_lock); 100 if (!zdev->fmb) { 101 mutex_unlock(&zdev->fmb_lock); 102 seq_puts(m, "FMB statistics disabled\n"); 103 return 0; 104 } 105 106 /* header */ 107 seq_printf(m, "Update interval: %u ms\n", zdev->fmb_update); 108 seq_printf(m, "Samples: %u\n", zdev->fmb->samples); 109 seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update); 110 111 pci_fmb_show(m, pci_common_names, ARRAY_SIZE(pci_common_names), 112 &zdev->fmb->ld_ops); 113 114 switch (zdev->fmb->format) { 115 case 0: 116 if (!(zdev->fmb->fmt_ind & ZPCI_FMB_DMA_COUNTER_VALID)) 117 break; 118 pci_fmb_show(m, pci_fmt0_names, ARRAY_SIZE(pci_fmt0_names), 119 &zdev->fmb->fmt0.dma_rbytes); 120 break; 121 case 1: 122 pci_fmb_show(m, pci_fmt1_names, ARRAY_SIZE(pci_fmt1_names), 123 &zdev->fmb->fmt1.rx_bytes); 124 break; 125 case 2: 126 pci_fmb_show(m, pci_fmt2_names, ARRAY_SIZE(pci_fmt2_names), 127 &zdev->fmb->fmt2.consumed_work_units); 128 break; 129 case 3: 130 pci_fmb_show(m, pci_fmt3_names, ARRAY_SIZE(pci_fmt3_names), 131 &zdev->fmb->fmt3.tx_bytes); 132 break; 133 default: 134 seq_puts(m, "Unknown format\n"); 135 } 136 137 pci_sw_counter_show(m); 138 mutex_unlock(&zdev->fmb_lock); 139 return 0; 140 } 141 142 static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf, 143 size_t count, loff_t *off) 144 { 145 struct zpci_dev *zdev = ((struct seq_file *) file->private_data)->private; 146 unsigned long val; 147 int rc; 148 149 if (!zdev) 150 return 0; 151 152 rc = kstrtoul_from_user(ubuf, count, 10, &val); 153 if (rc) 154 return rc; 155 156 mutex_lock(&zdev->fmb_lock); 157 switch (val) { 158 case 0: 159 rc = zpci_fmb_disable_device(zdev); 160 break; 161 case 1: 162 rc = zpci_fmb_enable_device(zdev); 163 break; 164 } 165 mutex_unlock(&zdev->fmb_lock); 166 return rc ? rc : count; 167 } 168 169 static int pci_perf_seq_open(struct inode *inode, struct file *filp) 170 { 171 return single_open(filp, pci_perf_show, 172 file_inode(filp)->i_private); 173 } 174 175 static const struct file_operations debugfs_pci_perf_fops = { 176 .open = pci_perf_seq_open, 177 .read = seq_read, 178 .write = pci_perf_seq_write, 179 .llseek = seq_lseek, 180 .release = single_release, 181 }; 182 183 void zpci_debug_init_device(struct zpci_dev *zdev, const char *name) 184 { 185 zdev->debugfs_dev = debugfs_create_dir(name, debugfs_root); 186 187 debugfs_create_file("statistics", S_IFREG | S_IRUGO | S_IWUSR, 188 zdev->debugfs_dev, zdev, &debugfs_pci_perf_fops); 189 } 190 191 void zpci_debug_exit_device(struct zpci_dev *zdev) 192 { 193 debugfs_remove_recursive(zdev->debugfs_dev); 194 } 195 196 int __init zpci_debug_init(void) 197 { 198 /* event trace buffer */ 199 pci_debug_msg_id = debug_register("pci_msg", 8, 1, 8 * sizeof(long)); 200 if (!pci_debug_msg_id) 201 return -EINVAL; 202 debug_register_view(pci_debug_msg_id, &debug_sprintf_view); 203 debug_set_level(pci_debug_msg_id, 3); 204 205 /* error log */ 206 pci_debug_err_id = debug_register("pci_error", 2, 1, 16); 207 if (!pci_debug_err_id) 208 return -EINVAL; 209 debug_register_view(pci_debug_err_id, &debug_hex_ascii_view); 210 debug_set_level(pci_debug_err_id, 3); 211 212 debugfs_root = debugfs_create_dir("pci", NULL); 213 return 0; 214 } 215 216 void zpci_debug_exit(void) 217 { 218 debug_unregister(pci_debug_msg_id); 219 debug_unregister(pci_debug_err_id); 220 debugfs_remove(debugfs_root); 221 } 222