| 1 | /* |
| 2 | * omap iommu: debugfs interface |
| 3 | * |
| 4 | * Copyright (C) 2008-2009 Nokia Corporation |
| 5 | * |
| 6 | * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/err.h> |
| 14 | #include <linux/io.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/uaccess.h> |
| 17 | #include <linux/debugfs.h> |
| 18 | #include <linux/platform_data/iommu-omap.h> |
| 19 | |
| 20 | #include "omap-iopgtable.h" |
| 21 | #include "omap-iommu.h" |
| 22 | |
| 23 | static DEFINE_MUTEX(iommu_debug_lock); |
| 24 | |
| 25 | static struct dentry *iommu_debug_root; |
| 26 | |
| 27 | static inline bool is_omap_iommu_detached(struct omap_iommu *obj) |
| 28 | { |
| 29 | return !obj->domain; |
| 30 | } |
| 31 | |
| 32 | static ssize_t debug_read_regs(struct file *file, char __user *userbuf, |
| 33 | size_t count, loff_t *ppos) |
| 34 | { |
| 35 | struct omap_iommu *obj = file->private_data; |
| 36 | char *p, *buf; |
| 37 | ssize_t bytes; |
| 38 | |
| 39 | if (is_omap_iommu_detached(obj)) |
| 40 | return -EPERM; |
| 41 | |
| 42 | buf = kmalloc(count, GFP_KERNEL); |
| 43 | if (!buf) |
| 44 | return -ENOMEM; |
| 45 | p = buf; |
| 46 | |
| 47 | mutex_lock(&iommu_debug_lock); |
| 48 | |
| 49 | bytes = omap_iommu_dump_ctx(obj, p, count); |
| 50 | bytes = simple_read_from_buffer(userbuf, count, ppos, buf, bytes); |
| 51 | |
| 52 | mutex_unlock(&iommu_debug_lock); |
| 53 | kfree(buf); |
| 54 | |
| 55 | return bytes; |
| 56 | } |
| 57 | |
| 58 | static ssize_t debug_read_tlb(struct file *file, char __user *userbuf, |
| 59 | size_t count, loff_t *ppos) |
| 60 | { |
| 61 | struct omap_iommu *obj = file->private_data; |
| 62 | char *p, *buf; |
| 63 | ssize_t bytes, rest; |
| 64 | |
| 65 | if (is_omap_iommu_detached(obj)) |
| 66 | return -EPERM; |
| 67 | |
| 68 | buf = kmalloc(count, GFP_KERNEL); |
| 69 | if (!buf) |
| 70 | return -ENOMEM; |
| 71 | p = buf; |
| 72 | |
| 73 | mutex_lock(&iommu_debug_lock); |
| 74 | |
| 75 | p += sprintf(p, "%8s %8s\n", "cam:", "ram:"); |
| 76 | p += sprintf(p, "-----------------------------------------\n"); |
| 77 | rest = count - (p - buf); |
| 78 | p += omap_dump_tlb_entries(obj, p, rest); |
| 79 | |
| 80 | bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); |
| 81 | |
| 82 | mutex_unlock(&iommu_debug_lock); |
| 83 | kfree(buf); |
| 84 | |
| 85 | return bytes; |
| 86 | } |
| 87 | |
| 88 | #define dump_ioptable_entry_one(lv, da, val) \ |
| 89 | ({ \ |
| 90 | int __err = 0; \ |
| 91 | ssize_t bytes; \ |
| 92 | const int maxcol = 22; \ |
| 93 | const char *str = "%d: %08x %08x\n"; \ |
| 94 | bytes = snprintf(p, maxcol, str, lv, da, val); \ |
| 95 | p += bytes; \ |
| 96 | len -= bytes; \ |
| 97 | if (len < maxcol) \ |
| 98 | __err = -ENOMEM; \ |
| 99 | __err; \ |
| 100 | }) |
| 101 | |
| 102 | static ssize_t dump_ioptable(struct omap_iommu *obj, char *buf, ssize_t len) |
| 103 | { |
| 104 | int i; |
| 105 | u32 *iopgd; |
| 106 | char *p = buf; |
| 107 | |
| 108 | spin_lock(&obj->page_table_lock); |
| 109 | |
| 110 | iopgd = iopgd_offset(obj, 0); |
| 111 | for (i = 0; i < PTRS_PER_IOPGD; i++, iopgd++) { |
| 112 | int j, err; |
| 113 | u32 *iopte; |
| 114 | u32 da; |
| 115 | |
| 116 | if (!*iopgd) |
| 117 | continue; |
| 118 | |
| 119 | if (!(*iopgd & IOPGD_TABLE)) { |
| 120 | da = i << IOPGD_SHIFT; |
| 121 | |
| 122 | err = dump_ioptable_entry_one(1, da, *iopgd); |
| 123 | if (err) |
| 124 | goto out; |
| 125 | continue; |
| 126 | } |
| 127 | |
| 128 | iopte = iopte_offset(iopgd, 0); |
| 129 | |
| 130 | for (j = 0; j < PTRS_PER_IOPTE; j++, iopte++) { |
| 131 | if (!*iopte) |
| 132 | continue; |
| 133 | |
| 134 | da = (i << IOPGD_SHIFT) + (j << IOPTE_SHIFT); |
| 135 | err = dump_ioptable_entry_one(2, da, *iopgd); |
| 136 | if (err) |
| 137 | goto out; |
| 138 | } |
| 139 | } |
| 140 | out: |
| 141 | spin_unlock(&obj->page_table_lock); |
| 142 | |
| 143 | return p - buf; |
| 144 | } |
| 145 | |
| 146 | static ssize_t debug_read_pagetable(struct file *file, char __user *userbuf, |
| 147 | size_t count, loff_t *ppos) |
| 148 | { |
| 149 | struct omap_iommu *obj = file->private_data; |
| 150 | char *p, *buf; |
| 151 | size_t bytes; |
| 152 | |
| 153 | if (is_omap_iommu_detached(obj)) |
| 154 | return -EPERM; |
| 155 | |
| 156 | buf = (char *)__get_free_page(GFP_KERNEL); |
| 157 | if (!buf) |
| 158 | return -ENOMEM; |
| 159 | p = buf; |
| 160 | |
| 161 | p += sprintf(p, "L: %8s %8s\n", "da:", "pa:"); |
| 162 | p += sprintf(p, "-----------------------------------------\n"); |
| 163 | |
| 164 | mutex_lock(&iommu_debug_lock); |
| 165 | |
| 166 | bytes = PAGE_SIZE - (p - buf); |
| 167 | p += dump_ioptable(obj, p, bytes); |
| 168 | |
| 169 | bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); |
| 170 | |
| 171 | mutex_unlock(&iommu_debug_lock); |
| 172 | free_page((unsigned long)buf); |
| 173 | |
| 174 | return bytes; |
| 175 | } |
| 176 | |
| 177 | #define DEBUG_FOPS_RO(name) \ |
| 178 | static const struct file_operations debug_##name##_fops = { \ |
| 179 | .open = simple_open, \ |
| 180 | .read = debug_read_##name, \ |
| 181 | .llseek = generic_file_llseek, \ |
| 182 | }; |
| 183 | |
| 184 | DEBUG_FOPS_RO(regs); |
| 185 | DEBUG_FOPS_RO(tlb); |
| 186 | DEBUG_FOPS_RO(pagetable); |
| 187 | |
| 188 | #define __DEBUG_ADD_FILE(attr, mode) \ |
| 189 | { \ |
| 190 | struct dentry *dent; \ |
| 191 | dent = debugfs_create_file(#attr, mode, obj->debug_dir, \ |
| 192 | obj, &debug_##attr##_fops); \ |
| 193 | if (!dent) \ |
| 194 | goto err; \ |
| 195 | } |
| 196 | |
| 197 | #define DEBUG_ADD_FILE_RO(name) __DEBUG_ADD_FILE(name, 0400) |
| 198 | |
| 199 | void omap_iommu_debugfs_add(struct omap_iommu *obj) |
| 200 | { |
| 201 | struct dentry *d; |
| 202 | |
| 203 | if (!iommu_debug_root) |
| 204 | return; |
| 205 | |
| 206 | obj->debug_dir = debugfs_create_dir(obj->name, iommu_debug_root); |
| 207 | if (!obj->debug_dir) |
| 208 | return; |
| 209 | |
| 210 | d = debugfs_create_u8("nr_tlb_entries", 0400, obj->debug_dir, |
| 211 | (u8 *)&obj->nr_tlb_entries); |
| 212 | if (!d) |
| 213 | return; |
| 214 | |
| 215 | DEBUG_ADD_FILE_RO(regs); |
| 216 | DEBUG_ADD_FILE_RO(tlb); |
| 217 | DEBUG_ADD_FILE_RO(pagetable); |
| 218 | |
| 219 | return; |
| 220 | |
| 221 | err: |
| 222 | debugfs_remove_recursive(obj->debug_dir); |
| 223 | } |
| 224 | |
| 225 | void omap_iommu_debugfs_remove(struct omap_iommu *obj) |
| 226 | { |
| 227 | if (!obj->debug_dir) |
| 228 | return; |
| 229 | |
| 230 | debugfs_remove_recursive(obj->debug_dir); |
| 231 | } |
| 232 | |
| 233 | void __init omap_iommu_debugfs_init(void) |
| 234 | { |
| 235 | iommu_debug_root = debugfs_create_dir("omap_iommu", NULL); |
| 236 | if (!iommu_debug_root) |
| 237 | pr_err("can't create debugfs dir\n"); |
| 238 | } |
| 239 | |
| 240 | void __exit omap_iommu_debugfs_exit(void) |
| 241 | { |
| 242 | debugfs_remove(iommu_debug_root); |
| 243 | } |