| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <1360845104-30392-1-git-send-email-dp@opensource.wolfsonmicro.com>
Date: Thu, 14 Feb 2013 12:31:44 +0000
From: Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>
To: Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc: linux-kernel@...r.kernel.org, patches@...nsource.wolfsonmicro.com
Subject: [PATCH 1/2] regmap: debugfs: Add a registers `range' file
This file lists the register ranges in the register map. The condition
to split the range is based on the actual register attributes. A range
is a contiguous block of registers with the same register attributes.
Signed-off-by: Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>
---
drivers/base/regmap/internal.h | 1 +
drivers/base/regmap/regmap-debugfs.c | 122 +++++++++++++++++++++++++++++++++++
2 files changed, 123 insertions(+)
diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h
index 5a22bd3..b4e55a0 100644
--- a/drivers/base/regmap/internal.h
+++ b/drivers/base/regmap/internal.h
@@ -27,6 +27,7 @@ struct regmap_debugfs_off_cache {
off_t max;
unsigned int base_reg;
unsigned int max_reg;
+ unsigned int reg_attr;
};
struct regmap_format {
diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index 5fb23cb..5843eb1 100644
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -56,6 +56,26 @@ static const struct file_operations regmap_name_fops = {
.llseek = default_llseek,
};
+enum reg_attributes {
+ READABLE = 0x1,
+ WRITEABLE = 0x2,
+ VOLATILE = 0x4,
+};
+
+static inline unsigned int regmap_attr_bitmap(struct regmap *map,
+ unsigned int reg)
+{
+ unsigned int reg_attr = 0;
+
+ if (regmap_readable(map, reg))
+ reg_attr |= READABLE;
+ if (regmap_writeable(map, reg))
+ reg_attr |= WRITEABLE;
+ if (regmap_volatile(map, reg))
+ reg_attr |= VOLATILE;
+ return reg_attr;
+}
+
static void regmap_debugfs_free_dump_cache(struct regmap *map)
{
struct regmap_debugfs_off_cache *c;
@@ -96,6 +116,7 @@ static unsigned int regmap_debugfs_get_dump_start(struct regmap *map,
if (c) {
c->max = p - 1;
c->max_reg = i - 1;
+ c->reg_attr = regmap_attr_bitmap(map, c->max_reg);
list_add_tail(&c->list,
&map->debugfs_off_cache);
c = NULL;
@@ -123,6 +144,7 @@ static unsigned int regmap_debugfs_get_dump_start(struct regmap *map,
if (c) {
c->max = p - 1;
c->max_reg = i - 1;
+ c->reg_attr = regmap_attr_bitmap(map, c->max_reg);
list_add_tail(&c->list,
&map->debugfs_off_cache);
}
@@ -307,6 +329,103 @@ static const struct file_operations regmap_range_fops = {
.llseek = default_llseek,
};
+static void regmap_range_format_line(struct regmap *map,
+ struct regmap_debugfs_off_cache *c,
+ char *buf, size_t len)
+{
+ ssize_t buf_offset;
+
+ buf_offset = snprintf(buf, PAGE_SIZE, "%x-%x ",
+ c->base_reg, c->max_reg);
+ buf_offset += snprintf(buf + buf_offset,
+ PAGE_SIZE - buf_offset, "(");
+ if (c->reg_attr & READABLE)
+ buf_offset += snprintf(buf + buf_offset,
+ PAGE_SIZE - buf_offset,
+ "read, ");
+ if (c->reg_attr & WRITEABLE)
+ buf_offset += snprintf(buf + buf_offset,
+ PAGE_SIZE - buf_offset,
+ "write, ");
+ if (c->reg_attr & VOLATILE)
+ buf_offset += snprintf(buf + buf_offset,
+ PAGE_SIZE - buf_offset,
+ "volatile, ");
+ /* Rewind the last ", " as well */
+ buf_offset += snprintf(buf + buf_offset - 2,
+ PAGE_SIZE - buf_offset, ")");
+}
+
+static ssize_t regmap_reg_ranges_read_file(struct file *file,
+ char __user *user_buf, size_t count,
+ loff_t *ppos)
+{
+ struct regmap *map = file->private_data;
+ struct regmap_debugfs_off_cache *c;
+ loff_t p = 0;
+ size_t buf_pos = 0;
+ char *buf;
+ char *entry;
+ int ret;
+
+ if (*ppos < 0 || !count)
+ return -EINVAL;
+
+ buf = kmalloc(count, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ entry = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!entry) {
+ kfree(buf);
+ return -ENOMEM;
+ }
+
+ /* While we are at it, build the register dump cache
+ * now so the read() operation on the `registers' file
+ * can benefit from using the cache. We do not care
+ * about the file position information that is contained
+ * in the cache, just about the actual register blocks */
+ regmap_calc_tot_len(map, buf, count);
+ regmap_debugfs_get_dump_start(map, 0, *ppos, &p);
+
+ /* Reset file pointer as the fixed-format of the `registers'
+ * file is not compatible with the `range' file */
+ p = 0;
+ list_for_each_entry(c, &map->debugfs_off_cache, list) {
+ regmap_range_format_line(map, c, entry, PAGE_SIZE);
+ if (p >= *ppos) {
+ if (buf_pos + 1 + strlen(entry) > count)
+ break;
+ snprintf(buf + buf_pos, count - buf_pos,
+ "%s", entry);
+ buf_pos += strlen(entry);
+ buf[buf_pos] = '\n';
+ buf_pos++;
+ }
+ p += strlen(entry) + 1;
+ }
+
+ kfree(entry);
+ ret = buf_pos;
+
+ if (copy_to_user(user_buf, buf, buf_pos)) {
+ ret = -EFAULT;
+ goto out_buf;
+ }
+
+ *ppos += buf_pos;
+out_buf:
+ kfree(buf);
+ return ret;
+}
+
+static const struct file_operations regmap_reg_ranges_fops = {
+ .open = simple_open,
+ .read = regmap_reg_ranges_read_file,
+ .llseek = default_llseek,
+};
+
static ssize_t regmap_access_read_file(struct file *file,
char __user *user_buf, size_t count,
loff_t *ppos)
@@ -399,6 +518,9 @@ void regmap_debugfs_init(struct regmap *map, const char *name)
debugfs_create_file("name", 0400, map->debugfs,
map, ®map_name_fops);
+ debugfs_create_file("range", 0400, map->debugfs,
+ map, ®map_reg_ranges_fops);
+
if (map->max_register) {
debugfs_create_file("registers", 0400, map->debugfs,
map, ®map_map_fops);
--
1.8.1.3
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists