| 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 | } |