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Date: Sun, 7 Feb 2016 23:35:38 +0200
From: Tomas Winkler <tomas.winkler@...el.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Alexander Usyskin <alexander.usyskin@...el.com>,
linux-kernel@...r.kernel.org,
Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc-next 22/27] mei: fixed address clients for the new platforms
From: Alexander Usyskin <alexander.usyskin@...el.com>
Enable by default connection to fixed address clients
from user-space for skylake and newer platform.
Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
drivers/misc/mei/debugfs.c | 31 +++++++++++++++++++++++++++++--
drivers/misc/mei/hbm.c | 4 ++++
drivers/misc/mei/hw.h | 6 ++++++
drivers/misc/mei/main.c | 18 ++++++++++++++----
drivers/misc/mei/mei_dev.h | 4 ++++
5 files changed, 57 insertions(+), 6 deletions(-)
diff --git a/drivers/misc/mei/debugfs.c b/drivers/misc/mei/debugfs.c
index 6bdd75424fe8..8ad406315741 100644
--- a/drivers/misc/mei/debugfs.c
+++ b/drivers/misc/mei/debugfs.c
@@ -176,6 +176,8 @@ static ssize_t mei_dbgfs_read_devstate(struct file *fp, char __user *ubuf,
dev->hbm_f_dot_supported);
pos += scnprintf(buf + pos, bufsz - pos, "\tEV: %01d\n",
dev->hbm_f_ev_supported);
+ pos += scnprintf(buf + pos, bufsz - pos, "\tFA: %01d\n",
+ dev->hbm_f_fa_supported);
}
pos += scnprintf(buf + pos, bufsz - pos, "pg: %s, %s\n",
@@ -191,6 +193,30 @@ static const struct file_operations mei_dbgfs_fops_devstate = {
.llseek = generic_file_llseek,
};
+static ssize_t mei_dbgfs_write_allow_fa(struct file *file,
+ const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct mei_device *dev;
+ int ret;
+
+ dev = container_of(file->private_data,
+ struct mei_device, allow_fixed_address);
+
+ ret = debugfs_write_file_bool(file, user_buf, count, ppos);
+ if (ret < 0)
+ return ret;
+ dev->override_fixed_address = true;
+ return ret;
+}
+
+static const struct file_operations mei_dbgfs_fops_allow_fa = {
+ .open = simple_open,
+ .read = debugfs_read_file_bool,
+ .write = mei_dbgfs_write_allow_fa,
+ .llseek = generic_file_llseek,
+};
+
/**
* mei_dbgfs_deregister - Remove the debugfs files and directories
*
@@ -240,8 +266,9 @@ 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_IRUSR | S_IWUSR, dir,
- &dev->allow_fixed_address);
+ f = debugfs_create_file("allow_fixed_address", S_IRUSR | S_IWUSR, dir,
+ &dev->allow_fixed_address,
+ &mei_dbgfs_fops_allow_fa);
if (!f) {
dev_err(dev->dev, "allow_fixed_address: registration failed\n");
goto err;
diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index e7b7aad0999b..3915b8e8d0f1 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -979,6 +979,10 @@ static void mei_hbm_config_features(struct mei_device *dev)
/* Notification Event Support */
if (dev->version.major_version >= HBM_MAJOR_VERSION_EV)
dev->hbm_f_ev_supported = 1;
+
+ /* Fixed Address Client Support */
+ if (dev->version.major_version >= HBM_MAJOR_VERSION_FA)
+ dev->hbm_f_fa_supported = 1;
}
/**
diff --git a/drivers/misc/mei/hw.h b/drivers/misc/mei/hw.h
index 4c5d6cfd79b4..459ad596df66 100644
--- a/drivers/misc/mei/hw.h
+++ b/drivers/misc/mei/hw.h
@@ -64,6 +64,12 @@
#define HBM_MINOR_VERSION_EV 0
#define HBM_MAJOR_VERSION_EV 2
+/*
+ * MEI version with fixed address client support
+ */
+#define HBM_MINOR_VERSION_FA 0
+#define HBM_MAJOR_VERSION_FA 2
+
/* Host bus message command opcode */
#define MEI_HBM_CMD_OP_MSK 0x7f
/* Host bus message command RESPONSE */
diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c
index c8a8d4df84e4..3ec6236c8782 100644
--- a/drivers/misc/mei/main.c
+++ b/drivers/misc/mei/main.c
@@ -369,12 +369,22 @@ 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 && !dev->allow_fixed_address)) {
+ if (!me_cl) {
dev_dbg(dev->dev, "Cannot connect to FW Client UUID = %pUl\n",
&data->in_client_uuid);
- mei_me_cl_put(me_cl);
- return -ENOTTY;
+ rets = -ENOTTY;
+ goto end;
+ }
+
+ if (me_cl->props.fixed_address) {
+ bool forbidden = dev->override_fixed_address ?
+ !dev->allow_fixed_address : !dev->hbm_f_fa_supported;
+ if (forbidden) {
+ dev_dbg(dev->dev, "Connection forbidden to FW Client UUID = %pUl\n",
+ &data->in_client_uuid);
+ rets = -ENOTTY;
+ goto end;
+ }
}
dev_dbg(dev->dev, "Connect to FW Client ID = %d\n",
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 70c4da015401..6d97f3335e22 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -396,6 +396,7 @@ const char *mei_pg_state_str(enum mei_pg_state state);
* @hbm_f_dc_supported : hbm feature dynamic clients
* @hbm_f_dot_supported : hbm feature disconnect on timeout
* @hbm_f_ev_supported : hbm feature event notification
+ * @hbm_f_fa_supported : hbm feature fixed address client
*
* @me_clients_rwsem: rw lock over me_clients list
* @me_clients : list of FW clients
@@ -404,6 +405,7 @@ const char *mei_pg_state_str(enum mei_pg_state state);
* @me_client_index : last FW client index in enumeration
*
* @allow_fixed_address: allow user space to connect a fixed client
+ * @override_fixed_address: force allow fixed address behavior
*
* @amthif_cmd_list : amthif list for cmd waiting
* @iamthif_fp : file for current amthif operation
@@ -483,6 +485,7 @@ struct mei_device {
unsigned int hbm_f_dc_supported:1;
unsigned int hbm_f_dot_supported:1;
unsigned int hbm_f_ev_supported:1;
+ unsigned int hbm_f_fa_supported:1;
struct rw_semaphore me_clients_rwsem;
struct list_head me_clients;
@@ -491,6 +494,7 @@ struct mei_device {
unsigned long me_client_index;
bool allow_fixed_address;
+ bool override_fixed_address;
/* amthif list for cmd waiting */
struct mei_cl_cb amthif_cmd_list;
--
2.4.3
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