1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2fcf3a6efSOhad Ben-Cohen /*
3fcf3a6efSOhad Ben-Cohen * omap iommu: debugfs interface
4fcf3a6efSOhad Ben-Cohen *
5fcf3a6efSOhad Ben-Cohen * Copyright (C) 2008-2009 Nokia Corporation
6fcf3a6efSOhad Ben-Cohen *
7fcf3a6efSOhad Ben-Cohen * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
8fcf3a6efSOhad Ben-Cohen */
9fcf3a6efSOhad Ben-Cohen
10fcf3a6efSOhad Ben-Cohen #include <linux/err.h>
11fcf3a6efSOhad Ben-Cohen #include <linux/io.h>
12fcf3a6efSOhad Ben-Cohen #include <linux/slab.h>
13fcf3a6efSOhad Ben-Cohen #include <linux/uaccess.h>
1469c2c196SSuman Anna #include <linux/pm_runtime.h>
15fcf3a6efSOhad Ben-Cohen #include <linux/debugfs.h>
162ab7c848STony Lindgren #include <linux/platform_data/iommu-omap.h>
17fcf3a6efSOhad Ben-Cohen
182f7702afSIdo Yariv #include "omap-iopgtable.h"
19ed1c7de2STony Lindgren #include "omap-iommu.h"
20fcf3a6efSOhad Ben-Cohen
21fcf3a6efSOhad Ben-Cohen static DEFINE_MUTEX(iommu_debug_lock);
22fcf3a6efSOhad Ben-Cohen
23fcf3a6efSOhad Ben-Cohen static struct dentry *iommu_debug_root;
24fcf3a6efSOhad Ben-Cohen
is_omap_iommu_detached(struct omap_iommu * obj)25c5cf5c53SSuman Anna static inline bool is_omap_iommu_detached(struct omap_iommu *obj)
26c5cf5c53SSuman Anna {
27c5cf5c53SSuman Anna return !obj->domain;
28c5cf5c53SSuman Anna }
29c5cf5c53SSuman Anna
3069c2c196SSuman Anna #define pr_reg(name) \
3169c2c196SSuman Anna do { \
3269c2c196SSuman Anna ssize_t bytes; \
3369c2c196SSuman Anna const char *str = "%20s: %08x\n"; \
3469c2c196SSuman Anna const int maxcol = 32; \
35*184233a5SDan Carpenter if (len < maxcol) \
36*184233a5SDan Carpenter goto out; \
37*184233a5SDan Carpenter bytes = scnprintf(p, maxcol, str, __stringify(name), \
3869c2c196SSuman Anna iommu_read_reg(obj, MMU_##name)); \
3969c2c196SSuman Anna p += bytes; \
4069c2c196SSuman Anna len -= bytes; \
4169c2c196SSuman Anna } while (0)
4269c2c196SSuman Anna
4369c2c196SSuman Anna static ssize_t
omap2_iommu_dump_ctx(struct omap_iommu * obj,char * buf,ssize_t len)4469c2c196SSuman Anna omap2_iommu_dump_ctx(struct omap_iommu *obj, char *buf, ssize_t len)
4569c2c196SSuman Anna {
4669c2c196SSuman Anna char *p = buf;
4769c2c196SSuman Anna
4869c2c196SSuman Anna pr_reg(REVISION);
4969c2c196SSuman Anna pr_reg(IRQSTATUS);
5069c2c196SSuman Anna pr_reg(IRQENABLE);
5169c2c196SSuman Anna pr_reg(WALKING_ST);
5269c2c196SSuman Anna pr_reg(CNTL);
5369c2c196SSuman Anna pr_reg(FAULT_AD);
5469c2c196SSuman Anna pr_reg(TTB);
5569c2c196SSuman Anna pr_reg(LOCK);
5669c2c196SSuman Anna pr_reg(LD_TLB);
5769c2c196SSuman Anna pr_reg(CAM);
5869c2c196SSuman Anna pr_reg(RAM);
5969c2c196SSuman Anna pr_reg(GFLUSH);
6069c2c196SSuman Anna pr_reg(FLUSH_ENTRY);
6169c2c196SSuman Anna pr_reg(READ_CAM);
6269c2c196SSuman Anna pr_reg(READ_RAM);
6369c2c196SSuman Anna pr_reg(EMU_FAULT_AD);
6469c2c196SSuman Anna out:
6569c2c196SSuman Anna return p - buf;
6669c2c196SSuman Anna }
6769c2c196SSuman Anna
omap_iommu_dump_ctx(struct omap_iommu * obj,char * buf,ssize_t bytes)6869c2c196SSuman Anna static ssize_t omap_iommu_dump_ctx(struct omap_iommu *obj, char *buf,
6969c2c196SSuman Anna ssize_t bytes)
7069c2c196SSuman Anna {
7169c2c196SSuman Anna if (!obj || !buf)
7269c2c196SSuman Anna return -EINVAL;
7369c2c196SSuman Anna
7469c2c196SSuman Anna pm_runtime_get_sync(obj->dev);
7569c2c196SSuman Anna
7669c2c196SSuman Anna bytes = omap2_iommu_dump_ctx(obj, buf, bytes);
7769c2c196SSuman Anna
7869c2c196SSuman Anna pm_runtime_put_sync(obj->dev);
7969c2c196SSuman Anna
8069c2c196SSuman Anna return bytes;
8169c2c196SSuman Anna }
8269c2c196SSuman Anna
debug_read_regs(struct file * file,char __user * userbuf,size_t count,loff_t * ppos)83fcf3a6efSOhad Ben-Cohen static ssize_t debug_read_regs(struct file *file, char __user *userbuf,
84fcf3a6efSOhad Ben-Cohen size_t count, loff_t *ppos)
85fcf3a6efSOhad Ben-Cohen {
8661c75352SSuman Anna struct omap_iommu *obj = file->private_data;
87fcf3a6efSOhad Ben-Cohen char *p, *buf;
88fcf3a6efSOhad Ben-Cohen ssize_t bytes;
89fcf3a6efSOhad Ben-Cohen
90c5cf5c53SSuman Anna if (is_omap_iommu_detached(obj))
91c5cf5c53SSuman Anna return -EPERM;
92c5cf5c53SSuman Anna
93fcf3a6efSOhad Ben-Cohen buf = kmalloc(count, GFP_KERNEL);
94fcf3a6efSOhad Ben-Cohen if (!buf)
95fcf3a6efSOhad Ben-Cohen return -ENOMEM;
96fcf3a6efSOhad Ben-Cohen p = buf;
97fcf3a6efSOhad Ben-Cohen
98fcf3a6efSOhad Ben-Cohen mutex_lock(&iommu_debug_lock);
99fcf3a6efSOhad Ben-Cohen
1006c32df43SOhad Ben-Cohen bytes = omap_iommu_dump_ctx(obj, p, count);
101dee9d154SColin Ian King if (bytes < 0)
102dee9d154SColin Ian King goto err;
103fcf3a6efSOhad Ben-Cohen bytes = simple_read_from_buffer(userbuf, count, ppos, buf, bytes);
104fcf3a6efSOhad Ben-Cohen
105dee9d154SColin Ian King err:
106fcf3a6efSOhad Ben-Cohen mutex_unlock(&iommu_debug_lock);
107fcf3a6efSOhad Ben-Cohen kfree(buf);
108fcf3a6efSOhad Ben-Cohen
109fcf3a6efSOhad Ben-Cohen return bytes;
110fcf3a6efSOhad Ben-Cohen }
111fcf3a6efSOhad Ben-Cohen
11269c2c196SSuman Anna static int
__dump_tlb_entries(struct omap_iommu * obj,struct cr_regs * crs,int num)11369c2c196SSuman Anna __dump_tlb_entries(struct omap_iommu *obj, struct cr_regs *crs, int num)
11469c2c196SSuman Anna {
11569c2c196SSuman Anna int i;
11669c2c196SSuman Anna struct iotlb_lock saved;
11769c2c196SSuman Anna struct cr_regs tmp;
11869c2c196SSuman Anna struct cr_regs *p = crs;
11969c2c196SSuman Anna
12069c2c196SSuman Anna pm_runtime_get_sync(obj->dev);
12169c2c196SSuman Anna iotlb_lock_get(obj, &saved);
12269c2c196SSuman Anna
12369c2c196SSuman Anna for_each_iotlb_cr(obj, num, i, tmp) {
12469c2c196SSuman Anna if (!iotlb_cr_valid(&tmp))
12569c2c196SSuman Anna continue;
12669c2c196SSuman Anna *p++ = tmp;
12769c2c196SSuman Anna }
12869c2c196SSuman Anna
12969c2c196SSuman Anna iotlb_lock_set(obj, &saved);
13069c2c196SSuman Anna pm_runtime_put_sync(obj->dev);
13169c2c196SSuman Anna
13269c2c196SSuman Anna return p - crs;
13369c2c196SSuman Anna }
13469c2c196SSuman Anna
iotlb_dump_cr(struct omap_iommu * obj,struct cr_regs * cr,struct seq_file * s)13569c2c196SSuman Anna static ssize_t iotlb_dump_cr(struct omap_iommu *obj, struct cr_regs *cr,
136e203db29SSalva Peiró struct seq_file *s)
13769c2c196SSuman Anna {
1386798a8caSJoe Perches seq_printf(s, "%08x %08x %01x\n", cr->cam, cr->ram,
13969c2c196SSuman Anna (cr->cam & MMU_CAM_P) ? 1 : 0);
1406798a8caSJoe Perches return 0;
14169c2c196SSuman Anna }
14269c2c196SSuman Anna
omap_dump_tlb_entries(struct omap_iommu * obj,struct seq_file * s)143e203db29SSalva Peiró static size_t omap_dump_tlb_entries(struct omap_iommu *obj, struct seq_file *s)
14469c2c196SSuman Anna {
14569c2c196SSuman Anna int i, num;
14669c2c196SSuman Anna struct cr_regs *cr;
14769c2c196SSuman Anna
148e203db29SSalva Peiró num = obj->nr_tlb_entries;
14969c2c196SSuman Anna
15069c2c196SSuman Anna cr = kcalloc(num, sizeof(*cr), GFP_KERNEL);
15169c2c196SSuman Anna if (!cr)
15269c2c196SSuman Anna return 0;
15369c2c196SSuman Anna
15469c2c196SSuman Anna num = __dump_tlb_entries(obj, cr, num);
15569c2c196SSuman Anna for (i = 0; i < num; i++)
156e203db29SSalva Peiró iotlb_dump_cr(obj, cr + i, s);
15769c2c196SSuman Anna kfree(cr);
15869c2c196SSuman Anna
159e203db29SSalva Peiró return 0;
16069c2c196SSuman Anna }
16169c2c196SSuman Anna
tlb_show(struct seq_file * s,void * data)162a6906a8bSYangtao Li static int tlb_show(struct seq_file *s, void *data)
163fcf3a6efSOhad Ben-Cohen {
164e203db29SSalva Peiró struct omap_iommu *obj = s->private;
165fcf3a6efSOhad Ben-Cohen
166c5cf5c53SSuman Anna if (is_omap_iommu_detached(obj))
167c5cf5c53SSuman Anna return -EPERM;
168c5cf5c53SSuman Anna
169fcf3a6efSOhad Ben-Cohen mutex_lock(&iommu_debug_lock);
170fcf3a6efSOhad Ben-Cohen
171e203db29SSalva Peiró seq_printf(s, "%8s %8s\n", "cam:", "ram:");
172e203db29SSalva Peiró seq_puts(s, "-----------------------------------------\n");
173e203db29SSalva Peiró omap_dump_tlb_entries(obj, s);
174fcf3a6efSOhad Ben-Cohen
175fcf3a6efSOhad Ben-Cohen mutex_unlock(&iommu_debug_lock);
176fcf3a6efSOhad Ben-Cohen
177e203db29SSalva Peiró return 0;
178fcf3a6efSOhad Ben-Cohen }
179fcf3a6efSOhad Ben-Cohen
dump_ioptable(struct seq_file * s)1809c83e9f3SSuman Anna static void dump_ioptable(struct seq_file *s)
181fcf3a6efSOhad Ben-Cohen {
1829c83e9f3SSuman Anna int i, j;
1839c83e9f3SSuman Anna u32 da;
1849c83e9f3SSuman Anna u32 *iopgd, *iopte;
1859c83e9f3SSuman Anna struct omap_iommu *obj = s->private;
186fcf3a6efSOhad Ben-Cohen
187fcf3a6efSOhad Ben-Cohen spin_lock(&obj->page_table_lock);
188fcf3a6efSOhad Ben-Cohen
189fcf3a6efSOhad Ben-Cohen iopgd = iopgd_offset(obj, 0);
190fcf3a6efSOhad Ben-Cohen for (i = 0; i < PTRS_PER_IOPGD; i++, iopgd++) {
191fcf3a6efSOhad Ben-Cohen if (!*iopgd)
192fcf3a6efSOhad Ben-Cohen continue;
193fcf3a6efSOhad Ben-Cohen
194fcf3a6efSOhad Ben-Cohen if (!(*iopgd & IOPGD_TABLE)) {
195fcf3a6efSOhad Ben-Cohen da = i << IOPGD_SHIFT;
1969c83e9f3SSuman Anna seq_printf(s, "1: 0x%08x 0x%08x\n", da, *iopgd);
197fcf3a6efSOhad Ben-Cohen continue;
198fcf3a6efSOhad Ben-Cohen }
199fcf3a6efSOhad Ben-Cohen
200fcf3a6efSOhad Ben-Cohen iopte = iopte_offset(iopgd, 0);
201fcf3a6efSOhad Ben-Cohen for (j = 0; j < PTRS_PER_IOPTE; j++, iopte++) {
202fcf3a6efSOhad Ben-Cohen if (!*iopte)
203fcf3a6efSOhad Ben-Cohen continue;
204fcf3a6efSOhad Ben-Cohen
205fcf3a6efSOhad Ben-Cohen da = (i << IOPGD_SHIFT) + (j << IOPTE_SHIFT);
2069c83e9f3SSuman Anna seq_printf(s, "2: 0x%08x 0x%08x\n", da, *iopte);
207fcf3a6efSOhad Ben-Cohen }
208fcf3a6efSOhad Ben-Cohen }
2099c83e9f3SSuman Anna
210fcf3a6efSOhad Ben-Cohen spin_unlock(&obj->page_table_lock);
211fcf3a6efSOhad Ben-Cohen }
212fcf3a6efSOhad Ben-Cohen
pagetable_show(struct seq_file * s,void * data)213a6906a8bSYangtao Li static int pagetable_show(struct seq_file *s, void *data)
214fcf3a6efSOhad Ben-Cohen {
2159c83e9f3SSuman Anna struct omap_iommu *obj = s->private;
216fcf3a6efSOhad Ben-Cohen
217c5cf5c53SSuman Anna if (is_omap_iommu_detached(obj))
218c5cf5c53SSuman Anna return -EPERM;
219c5cf5c53SSuman Anna
220fcf3a6efSOhad Ben-Cohen mutex_lock(&iommu_debug_lock);
221fcf3a6efSOhad Ben-Cohen
2229c83e9f3SSuman Anna seq_printf(s, "L: %8s %8s\n", "da:", "pte:");
2239c83e9f3SSuman Anna seq_puts(s, "--------------------------\n");
2249c83e9f3SSuman Anna dump_ioptable(s);
225fcf3a6efSOhad Ben-Cohen
226fcf3a6efSOhad Ben-Cohen mutex_unlock(&iommu_debug_lock);
227fcf3a6efSOhad Ben-Cohen
2289c83e9f3SSuman Anna return 0;
2299c83e9f3SSuman Anna }
2309c83e9f3SSuman Anna
231fcf3a6efSOhad Ben-Cohen #define DEBUG_FOPS_RO(name) \
232a6906a8bSYangtao Li static const struct file_operations name##_fops = { \
233234e3405SStephen Boyd .open = simple_open, \
234fcf3a6efSOhad Ben-Cohen .read = debug_read_##name, \
235fcf3a6efSOhad Ben-Cohen .llseek = generic_file_llseek, \
2365b39a37aSSuman Anna }
237fcf3a6efSOhad Ben-Cohen
238fcf3a6efSOhad Ben-Cohen DEBUG_FOPS_RO(regs);
239a6906a8bSYangtao Li DEFINE_SHOW_ATTRIBUTE(tlb);
240a6906a8bSYangtao Li DEFINE_SHOW_ATTRIBUTE(pagetable);
241fcf3a6efSOhad Ben-Cohen
omap_iommu_debugfs_add(struct omap_iommu * obj)24261c75352SSuman Anna void omap_iommu_debugfs_add(struct omap_iommu *obj)
243fcf3a6efSOhad Ben-Cohen {
24461c75352SSuman Anna struct dentry *d;
245fcf3a6efSOhad Ben-Cohen
24661c75352SSuman Anna if (!iommu_debug_root)
24761c75352SSuman Anna return;
248fcf3a6efSOhad Ben-Cohen
2499378bfeaSGreg Kroah-Hartman d = debugfs_create_dir(obj->name, iommu_debug_root);
2509378bfeaSGreg Kroah-Hartman obj->debug_dir = d;
25146451d62SOhad Ben-Cohen
2529378bfeaSGreg Kroah-Hartman debugfs_create_u32("nr_tlb_entries", 0400, d, &obj->nr_tlb_entries);
2539378bfeaSGreg Kroah-Hartman debugfs_create_file("regs", 0400, d, obj, ®s_fops);
2549378bfeaSGreg Kroah-Hartman debugfs_create_file("tlb", 0400, d, obj, &tlb_fops);
2559378bfeaSGreg Kroah-Hartman debugfs_create_file("pagetable", 0400, d, obj, &pagetable_fops);
25646451d62SOhad Ben-Cohen }
25746451d62SOhad Ben-Cohen
omap_iommu_debugfs_remove(struct omap_iommu * obj)25861c75352SSuman Anna void omap_iommu_debugfs_remove(struct omap_iommu *obj)
25946451d62SOhad Ben-Cohen {
26061c75352SSuman Anna if (!obj->debug_dir)
26161c75352SSuman Anna return;
26246451d62SOhad Ben-Cohen
26361c75352SSuman Anna debugfs_remove_recursive(obj->debug_dir);
264fcf3a6efSOhad Ben-Cohen }
265fcf3a6efSOhad Ben-Cohen
omap_iommu_debugfs_init(void)26661c75352SSuman Anna void __init omap_iommu_debugfs_init(void)
267fcf3a6efSOhad Ben-Cohen {
26861c75352SSuman Anna iommu_debug_root = debugfs_create_dir("omap_iommu", NULL);
269fcf3a6efSOhad Ben-Cohen }
270fcf3a6efSOhad Ben-Cohen
omap_iommu_debugfs_exit(void)27161c75352SSuman Anna void __exit omap_iommu_debugfs_exit(void)
272fcf3a6efSOhad Ben-Cohen {
27361c75352SSuman Anna debugfs_remove(iommu_debug_root);
274fcf3a6efSOhad Ben-Cohen }
275