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Subject[char-misc-next 6/8 RESEND] mei: connection to fixed address clients from user-space
Date
From: Alexander Usyskin <alexander.usyskin@intel.com>

This should be used for debug only.
The feaure is gated by "allow_fixed_address" control exposed in debugfs.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
drivers/misc/mei/debugfs.c | 6 ++++++
drivers/misc/mei/main.c | 8 +++++++-
drivers/misc/mei/mei_dev.h | 4 ++++
3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/mei/debugfs.c b/drivers/misc/mei/debugfs.c
index 3f6d855a7ecb..3cac3bc82185 100644
--- a/drivers/misc/mei/debugfs.c
+++ b/drivers/misc/mei/debugfs.c
@@ -209,6 +209,12 @@ int mei_dbgfs_register(struct mei_device *dev, const char *name)
dev_err(dev->dev, "devstate: registration failed\n");
goto err;
}
+ f = debugfs_create_bool("allow_fixed_address", S_IROTH | S_IWOTH, dir,
+ &dev->allow_fixed_address);
+ if (!f) {
+ dev_err(dev->dev, "allow_fixed_address: registration failed\n");
+ goto err;
+ }
dev->dbgfs_dir = dir;
return 0;
err:
diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c
index dcaa7658e742..ca128e2aaf10 100644
--- a/drivers/misc/mei/main.c
+++ b/drivers/misc/mei/main.c
@@ -216,6 +216,11 @@ static ssize_t mei_read(struct file *file, char __user *ubuf,

cb = mei_cl_read_cb(cl, file);
if (!cb) {
+ if (mei_cl_is_fixed_address(cl) && dev->allow_fixed_address) {
+ cb = mei_cl_read_cb(cl, NULL);
+ if (cb)
+ goto copy_buffer;
+ }
rets = 0;
goto out;
}
@@ -390,7 +395,8 @@ static int mei_ioctl_connect_client(struct file *file,

/* find ME client we're trying to connect to */
me_cl = mei_me_cl_by_uuid(dev, &data->in_client_uuid);
- if (!me_cl || me_cl->props.fixed_address) {
+ if (!me_cl ||
+ (me_cl->props.fixed_address && !dev->allow_fixed_address)) {
dev_dbg(dev->dev, "Cannot connect to FW Client UUID = %pUl\n",
&data->in_client_uuid);
mei_me_cl_put(me_cl);
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index f17979c680a9..6cbcb11a6974 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -475,6 +475,8 @@ const char *mei_pg_state_str(enum mei_pg_state state);
* @host_clients_map : host clients id pool
* @me_client_index : last FW client index in enumeration
*
+ * @allow_fixed_address: allow user space to connect a fixed client
+ *
* @wd_cl : watchdog client
* @wd_state : watchdog client state
* @wd_pending : watchdog command is pending
@@ -566,6 +568,8 @@ struct mei_device {
DECLARE_BITMAP(host_clients_map, MEI_CLIENTS_MAX);
unsigned long me_client_index;

+ u32 allow_fixed_address;
+
struct mei_cl wd_cl;
enum mei_wd_states wd_state;
bool wd_pending;
--
1.9.3


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