v4.19.13 snapshot.
diff --git a/drivers/iommu/omap-iommu-debug.c b/drivers/iommu/omap-iommu-debug.c
new file mode 100644
index 0000000..5021754
--- /dev/null
+++ b/drivers/iommu/omap-iommu-debug.c
@@ -0,0 +1,310 @@
+/*
+ * omap iommu: debugfs interface
+ *
+ * Copyright (C) 2008-2009 Nokia Corporation
+ *
+ * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/pm_runtime.h>
+#include <linux/debugfs.h>
+#include <linux/platform_data/iommu-omap.h>
+
+#include "omap-iopgtable.h"
+#include "omap-iommu.h"
+
+static DEFINE_MUTEX(iommu_debug_lock);
+
+static struct dentry *iommu_debug_root;
+
+static inline bool is_omap_iommu_detached(struct omap_iommu *obj)
+{
+ return !obj->domain;
+}
+
+#define pr_reg(name) \
+ do { \
+ ssize_t bytes; \
+ const char *str = "%20s: %08x\n"; \
+ const int maxcol = 32; \
+ bytes = snprintf(p, maxcol, str, __stringify(name), \
+ iommu_read_reg(obj, MMU_##name)); \
+ p += bytes; \
+ len -= bytes; \
+ if (len < maxcol) \
+ goto out; \
+ } while (0)
+
+static ssize_t
+omap2_iommu_dump_ctx(struct omap_iommu *obj, char *buf, ssize_t len)
+{
+ char *p = buf;
+
+ pr_reg(REVISION);
+ pr_reg(IRQSTATUS);
+ pr_reg(IRQENABLE);
+ pr_reg(WALKING_ST);
+ pr_reg(CNTL);
+ pr_reg(FAULT_AD);
+ pr_reg(TTB);
+ pr_reg(LOCK);
+ pr_reg(LD_TLB);
+ pr_reg(CAM);
+ pr_reg(RAM);
+ pr_reg(GFLUSH);
+ pr_reg(FLUSH_ENTRY);
+ pr_reg(READ_CAM);
+ pr_reg(READ_RAM);
+ pr_reg(EMU_FAULT_AD);
+out:
+ return p - buf;
+}
+
+static ssize_t omap_iommu_dump_ctx(struct omap_iommu *obj, char *buf,
+ ssize_t bytes)
+{
+ if (!obj || !buf)
+ return -EINVAL;
+
+ pm_runtime_get_sync(obj->dev);
+
+ bytes = omap2_iommu_dump_ctx(obj, buf, bytes);
+
+ pm_runtime_put_sync(obj->dev);
+
+ return bytes;
+}
+
+static ssize_t debug_read_regs(struct file *file, char __user *userbuf,
+ size_t count, loff_t *ppos)
+{
+ struct omap_iommu *obj = file->private_data;
+ char *p, *buf;
+ ssize_t bytes;
+
+ if (is_omap_iommu_detached(obj))
+ return -EPERM;
+
+ buf = kmalloc(count, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+ p = buf;
+
+ mutex_lock(&iommu_debug_lock);
+
+ bytes = omap_iommu_dump_ctx(obj, p, count);
+ bytes = simple_read_from_buffer(userbuf, count, ppos, buf, bytes);
+
+ mutex_unlock(&iommu_debug_lock);
+ kfree(buf);
+
+ return bytes;
+}
+
+static int
+__dump_tlb_entries(struct omap_iommu *obj, struct cr_regs *crs, int num)
+{
+ int i;
+ struct iotlb_lock saved;
+ struct cr_regs tmp;
+ struct cr_regs *p = crs;
+
+ pm_runtime_get_sync(obj->dev);
+ iotlb_lock_get(obj, &saved);
+
+ for_each_iotlb_cr(obj, num, i, tmp) {
+ if (!iotlb_cr_valid(&tmp))
+ continue;
+ *p++ = tmp;
+ }
+
+ iotlb_lock_set(obj, &saved);
+ pm_runtime_put_sync(obj->dev);
+
+ return p - crs;
+}
+
+static ssize_t iotlb_dump_cr(struct omap_iommu *obj, struct cr_regs *cr,
+ struct seq_file *s)
+{
+ seq_printf(s, "%08x %08x %01x\n", cr->cam, cr->ram,
+ (cr->cam & MMU_CAM_P) ? 1 : 0);
+ return 0;
+}
+
+static size_t omap_dump_tlb_entries(struct omap_iommu *obj, struct seq_file *s)
+{
+ int i, num;
+ struct cr_regs *cr;
+
+ num = obj->nr_tlb_entries;
+
+ cr = kcalloc(num, sizeof(*cr), GFP_KERNEL);
+ if (!cr)
+ return 0;
+
+ num = __dump_tlb_entries(obj, cr, num);
+ for (i = 0; i < num; i++)
+ iotlb_dump_cr(obj, cr + i, s);
+ kfree(cr);
+
+ return 0;
+}
+
+static int debug_read_tlb(struct seq_file *s, void *data)
+{
+ struct omap_iommu *obj = s->private;
+
+ if (is_omap_iommu_detached(obj))
+ return -EPERM;
+
+ mutex_lock(&iommu_debug_lock);
+
+ seq_printf(s, "%8s %8s\n", "cam:", "ram:");
+ seq_puts(s, "-----------------------------------------\n");
+ omap_dump_tlb_entries(obj, s);
+
+ mutex_unlock(&iommu_debug_lock);
+
+ return 0;
+}
+
+static void dump_ioptable(struct seq_file *s)
+{
+ int i, j;
+ u32 da;
+ u32 *iopgd, *iopte;
+ struct omap_iommu *obj = s->private;
+
+ spin_lock(&obj->page_table_lock);
+
+ iopgd = iopgd_offset(obj, 0);
+ for (i = 0; i < PTRS_PER_IOPGD; i++, iopgd++) {
+ if (!*iopgd)
+ continue;
+
+ if (!(*iopgd & IOPGD_TABLE)) {
+ da = i << IOPGD_SHIFT;
+ seq_printf(s, "1: 0x%08x 0x%08x\n", da, *iopgd);
+ continue;
+ }
+
+ iopte = iopte_offset(iopgd, 0);
+ for (j = 0; j < PTRS_PER_IOPTE; j++, iopte++) {
+ if (!*iopte)
+ continue;
+
+ da = (i << IOPGD_SHIFT) + (j << IOPTE_SHIFT);
+ seq_printf(s, "2: 0x%08x 0x%08x\n", da, *iopte);
+ }
+ }
+
+ spin_unlock(&obj->page_table_lock);
+}
+
+static int debug_read_pagetable(struct seq_file *s, void *data)
+{
+ struct omap_iommu *obj = s->private;
+
+ if (is_omap_iommu_detached(obj))
+ return -EPERM;
+
+ mutex_lock(&iommu_debug_lock);
+
+ seq_printf(s, "L: %8s %8s\n", "da:", "pte:");
+ seq_puts(s, "--------------------------\n");
+ dump_ioptable(s);
+
+ mutex_unlock(&iommu_debug_lock);
+
+ return 0;
+}
+
+#define DEBUG_SEQ_FOPS_RO(name) \
+ static int debug_open_##name(struct inode *inode, struct file *file) \
+ { \
+ return single_open(file, debug_read_##name, inode->i_private); \
+ } \
+ \
+ static const struct file_operations debug_##name##_fops = { \
+ .open = debug_open_##name, \
+ .read = seq_read, \
+ .llseek = seq_lseek, \
+ .release = single_release, \
+ }
+
+#define DEBUG_FOPS_RO(name) \
+ static const struct file_operations debug_##name##_fops = { \
+ .open = simple_open, \
+ .read = debug_read_##name, \
+ .llseek = generic_file_llseek, \
+ }
+
+DEBUG_FOPS_RO(regs);
+DEBUG_SEQ_FOPS_RO(tlb);
+DEBUG_SEQ_FOPS_RO(pagetable);
+
+#define __DEBUG_ADD_FILE(attr, mode) \
+ { \
+ struct dentry *dent; \
+ dent = debugfs_create_file(#attr, mode, obj->debug_dir, \
+ obj, &debug_##attr##_fops); \
+ if (!dent) \
+ goto err; \
+ }
+
+#define DEBUG_ADD_FILE_RO(name) __DEBUG_ADD_FILE(name, 0400)
+
+void omap_iommu_debugfs_add(struct omap_iommu *obj)
+{
+ struct dentry *d;
+
+ if (!iommu_debug_root)
+ return;
+
+ obj->debug_dir = debugfs_create_dir(obj->name, iommu_debug_root);
+ if (!obj->debug_dir)
+ return;
+
+ d = debugfs_create_u32("nr_tlb_entries", 0400, obj->debug_dir,
+ &obj->nr_tlb_entries);
+ if (!d)
+ return;
+
+ DEBUG_ADD_FILE_RO(regs);
+ DEBUG_ADD_FILE_RO(tlb);
+ DEBUG_ADD_FILE_RO(pagetable);
+
+ return;
+
+err:
+ debugfs_remove_recursive(obj->debug_dir);
+}
+
+void omap_iommu_debugfs_remove(struct omap_iommu *obj)
+{
+ if (!obj->debug_dir)
+ return;
+
+ debugfs_remove_recursive(obj->debug_dir);
+}
+
+void __init omap_iommu_debugfs_init(void)
+{
+ iommu_debug_root = debugfs_create_dir("omap_iommu", NULL);
+ if (!iommu_debug_root)
+ pr_err("can't create debugfs dir\n");
+}
+
+void __exit omap_iommu_debugfs_exit(void)
+{
+ debugfs_remove(iommu_debug_root);
+}