linux-kernel - [PATCH v2] clk: Add support for setting clk

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

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190828132306.19012-1-geert+renesas@glider.be>
Date:   Wed, 28 Aug 2019 15:23:06 +0200
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     Raman Banka <raman.k2@...sung.com>, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH v2] clk: Add support for setting clk_rate via debugfs

For testing, it is useful to be able to specify a clock rate manually.
As this is a dangerous feature, it is not enabled by default.
Users need to modify the source directly and #define
CLOCK_ALLOW_WRITE_DEBUGFS.

This follows the spirit of commit 09c6ecd394105c48 ("regmap: Add support
for writing to regmap registers via debugfs").

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
Stephen: you suggested this approach in
https://lore.kernel.org/linux-clk/153029668040.143105.2059491089047180792@swboyd.mtv.corp.google.com/

v2:
  - Rebased.
---
 drivers/clk/clk.c | 38 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 2ba52b8dafcc1cc5..5b3c915b9507634c 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -2990,6 +2990,41 @@ static int clk_dump_show(struct seq_file *s, void *data)
 }
 DEFINE_SHOW_ATTRIBUTE(clk_dump);
 
+#undef CLOCK_ALLOW_WRITE_DEBUGFS
+#ifdef CLOCK_ALLOW_WRITE_DEBUGFS
+/*
+ * This can be dangerous, therefore don't provide any real compile time
+ * configuration option for this feature.
+ * People who want to use this will need to modify the source code directly.
+ */
+static int clk_rate_set(void *data, u64 val)
+{
+	struct clk_core *core = data;
+	int ret;
+
+	clk_prepare_lock();
+	ret = clk_core_set_rate_nolock(core, val);
+	clk_prepare_unlock();
+
+	return ret;
+}
+
+#define clk_rate_mode	0644
+#else
+#define clk_rate_set	NULL
+#define clk_rate_mode	0444
+#endif
+
+static int clk_rate_get(void *data, u64 *val)
+{
+	struct clk_core *core = data;
+
+	*val = core->rate;
+	return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(clk_rate_fops, clk_rate_get, clk_rate_set, "%llu\n");
+
 static const struct {
 	unsigned long flag;
 	const char *name;
@@ -3139,7 +3174,8 @@ static void clk_debug_create_one(struct clk_core *core, struct dentry *pdentry)
 	root = debugfs_create_dir(core->name, pdentry);
 	core->dentry = root;
 
-	debugfs_create_ulong("clk_rate", 0444, root, &core->rate);
+	debugfs_create_file("clk_rate", clk_rate_mode, root, core,
+			    &clk_rate_fops);
 	debugfs_create_file("clk_min_rate", 0444, root, core, &clk_min_rate_fops);
 	debugfs_create_file("clk_max_rate", 0444, root, core, &clk_max_rate_fops);
 	debugfs_create_ulong("clk_accuracy", 0444, root, &core->accuracy);
-- 
2.17.1