2 * omap iommu: debugfs interface
4 * Copyright (C) 2008-2009 Nokia Corporation
6 * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
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.
13 #include <linux/err.h>
15 #include <linux/slab.h>
16 #include <linux/uaccess.h>
17 #include <linux/pm_runtime.h>
18 #include <linux/debugfs.h>
19 #include <linux/platform_data/iommu-omap.h>
21 #include "omap-iopgtable.h"
22 #include "omap-iommu.h"
24 static DEFINE_MUTEX(iommu_debug_lock);
26 static struct dentry *iommu_debug_root;
28 static inline bool is_omap_iommu_detached(struct omap_iommu *obj)
33 #define pr_reg(name) \
36 const char *str = "%20s: %08x\n"; \
37 const int maxcol = 32; \
40 bytes = scnprintf(p, maxcol, str, __stringify(name), \
41 iommu_read_reg(obj, MMU_##name)); \
47 omap2_iommu_dump_ctx(struct omap_iommu *obj, char *buf, ssize_t len)
71 static ssize_t omap_iommu_dump_ctx(struct omap_iommu *obj, char *buf,
77 pm_runtime_get_sync(obj->dev);
79 bytes = omap2_iommu_dump_ctx(obj, buf, bytes);
81 pm_runtime_put_sync(obj->dev);
86 static ssize_t debug_read_regs(struct file *file, char __user *userbuf,
87 size_t count, loff_t *ppos)
89 struct omap_iommu *obj = file->private_data;
93 if (is_omap_iommu_detached(obj))
96 buf = kmalloc(count, GFP_KERNEL);
101 mutex_lock(&iommu_debug_lock);
103 bytes = omap_iommu_dump_ctx(obj, p, count);
106 bytes = simple_read_from_buffer(userbuf, count, ppos, buf, bytes);
109 mutex_unlock(&iommu_debug_lock);
116 __dump_tlb_entries(struct omap_iommu *obj, struct cr_regs *crs, int num)
119 struct iotlb_lock saved;
121 struct cr_regs *p = crs;
123 pm_runtime_get_sync(obj->dev);
124 iotlb_lock_get(obj, &saved);
126 for_each_iotlb_cr(obj, num, i, tmp) {
127 if (!iotlb_cr_valid(&tmp))
132 iotlb_lock_set(obj, &saved);
133 pm_runtime_put_sync(obj->dev);
138 static ssize_t iotlb_dump_cr(struct omap_iommu *obj, struct cr_regs *cr,
141 seq_printf(s, "%08x %08x %01x\n", cr->cam, cr->ram,
142 (cr->cam & MMU_CAM_P) ? 1 : 0);
146 static size_t omap_dump_tlb_entries(struct omap_iommu *obj, struct seq_file *s)
151 num = obj->nr_tlb_entries;
153 cr = kcalloc(num, sizeof(*cr), GFP_KERNEL);
157 num = __dump_tlb_entries(obj, cr, num);
158 for (i = 0; i < num; i++)
159 iotlb_dump_cr(obj, cr + i, s);
165 static int debug_read_tlb(struct seq_file *s, void *data)
167 struct omap_iommu *obj = s->private;
169 if (is_omap_iommu_detached(obj))
172 mutex_lock(&iommu_debug_lock);
174 seq_printf(s, "%8s %8s\n", "cam:", "ram:");
175 seq_puts(s, "-----------------------------------------\n");
176 omap_dump_tlb_entries(obj, s);
178 mutex_unlock(&iommu_debug_lock);
183 static void dump_ioptable(struct seq_file *s)
188 struct omap_iommu *obj = s->private;
190 spin_lock(&obj->page_table_lock);
192 iopgd = iopgd_offset(obj, 0);
193 for (i = 0; i < PTRS_PER_IOPGD; i++, iopgd++) {
197 if (!(*iopgd & IOPGD_TABLE)) {
198 da = i << IOPGD_SHIFT;
199 seq_printf(s, "1: 0x%08x 0x%08x\n", da, *iopgd);
203 iopte = iopte_offset(iopgd, 0);
204 for (j = 0; j < PTRS_PER_IOPTE; j++, iopte++) {
208 da = (i << IOPGD_SHIFT) + (j << IOPTE_SHIFT);
209 seq_printf(s, "2: 0x%08x 0x%08x\n", da, *iopte);
213 spin_unlock(&obj->page_table_lock);
216 static int debug_read_pagetable(struct seq_file *s, void *data)
218 struct omap_iommu *obj = s->private;
220 if (is_omap_iommu_detached(obj))
223 mutex_lock(&iommu_debug_lock);
225 seq_printf(s, "L: %8s %8s\n", "da:", "pte:");
226 seq_puts(s, "--------------------------\n");
229 mutex_unlock(&iommu_debug_lock);
234 #define DEBUG_SEQ_FOPS_RO(name) \
235 static int debug_open_##name(struct inode *inode, struct file *file) \
237 return single_open(file, debug_read_##name, inode->i_private); \
240 static const struct file_operations debug_##name##_fops = { \
241 .open = debug_open_##name, \
243 .llseek = seq_lseek, \
244 .release = single_release, \
247 #define DEBUG_FOPS_RO(name) \
248 static const struct file_operations debug_##name##_fops = { \
249 .open = simple_open, \
250 .read = debug_read_##name, \
251 .llseek = generic_file_llseek, \
255 DEBUG_SEQ_FOPS_RO(tlb);
256 DEBUG_SEQ_FOPS_RO(pagetable);
258 #define __DEBUG_ADD_FILE(attr, mode) \
260 struct dentry *dent; \
261 dent = debugfs_create_file(#attr, mode, obj->debug_dir, \
262 obj, &debug_##attr##_fops); \
267 #define DEBUG_ADD_FILE_RO(name) __DEBUG_ADD_FILE(name, 0400)
269 void omap_iommu_debugfs_add(struct omap_iommu *obj)
273 if (!iommu_debug_root)
276 obj->debug_dir = debugfs_create_dir(obj->name, iommu_debug_root);
280 d = debugfs_create_u32("nr_tlb_entries", 0400, obj->debug_dir,
281 &obj->nr_tlb_entries);
285 DEBUG_ADD_FILE_RO(regs);
286 DEBUG_ADD_FILE_RO(tlb);
287 DEBUG_ADD_FILE_RO(pagetable);
292 debugfs_remove_recursive(obj->debug_dir);
295 void omap_iommu_debugfs_remove(struct omap_iommu *obj)
300 debugfs_remove_recursive(obj->debug_dir);
303 void __init omap_iommu_debugfs_init(void)
305 iommu_debug_root = debugfs_create_dir("omap_iommu", NULL);
306 if (!iommu_debug_root)
307 pr_err("can't create debugfs dir\n");
310 void __exit omap_iommu_debugfs_exit(void)
312 debugfs_remove(iommu_debug_root);