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Subject[char-misc-next 10/15 V3] mei: bus: add me client device list infrastructure
Date
Instead of holding the list of host clients (me_cl)
we want to keep the list me client devices (mei_cl_device)
This way we can create host to me client connection only when needed.
Add list head to mei_cl_device and cl_bus_lock
Add bus_added flag to the me client (mei_me_client) to track if
the appropriate mei_cl_device was already created and is_added
flag to mei_cl_device to track if it was already added to the device
list across the bus rescans

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
V2: resend
V3: rebase
drivers/misc/mei/bus.c | 1 +
drivers/misc/mei/init.c | 1 +
drivers/misc/mei/mei_dev.h | 6 ++++--
include/linux/mei_cl_bus.h | 4 ++++
4 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
index 963731eb4383..34b14dda050c 100644
--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -657,6 +657,7 @@ struct mei_cl_device *mei_cl_add_device(struct mei_device *bus,
cldev->dev.bus = &mei_cl_bus_type;
cldev->dev.type = &mei_cl_device_type;
cldev->bus = mei_dev_bus_get(bus);
+ INIT_LIST_HEAD(&cldev->bus_list);

strlcpy(cldev->name, name, sizeof(cldev->name));

diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c
index 00c3865ca3b1..15000e9231b1 100644
--- a/drivers/misc/mei/init.c
+++ b/drivers/misc/mei/init.c
@@ -390,6 +390,7 @@ void mei_device_init(struct mei_device *dev,
INIT_LIST_HEAD(&dev->me_clients);
mutex_init(&dev->device_lock);
init_rwsem(&dev->me_clients_rwsem);
+ mutex_init(&dev->cl_bus_lock);
init_waitqueue_head(&dev->wait_hw_ready);
init_waitqueue_head(&dev->wait_pg);
init_waitqueue_head(&dev->wait_hbm_start);
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index bc65fb42aea9..882e6f77084a 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -178,7 +178,7 @@ struct mei_fw_status {
* @client_id: me client id
* @mei_flow_ctrl_creds: flow control credits
* @connect_count: number connections to this client
- * @reserved: reserved
+ * @bus_added: added to bus
*/
struct mei_me_client {
struct list_head list;
@@ -187,7 +187,7 @@ struct mei_me_client {
u8 client_id;
u8 mei_flow_ctrl_creds;
u8 connect_count;
- u8 reserved;
+ u8 bus_added;
};


@@ -447,6 +447,7 @@ const char *mei_pg_state_str(enum mei_pg_state state);
* @reset_work : work item for the device reset
*
* @device_list : mei client bus list
+ * @cl_bus_lock : client bus list lock
*
* @dbgfs_dir : debugfs mei root directory
*
@@ -543,6 +544,7 @@ struct mei_device {

/* List of bus devices */
struct list_head device_list;
+ struct mutex cl_bus_lock;

#if IS_ENABLED(CONFIG_DEBUG_FS)
struct dentry *dbgfs_dir;
diff --git a/include/linux/mei_cl_bus.h b/include/linux/mei_cl_bus.h
index 4c5c25b3222c..85239138251c 100644
--- a/include/linux/mei_cl_bus.h
+++ b/include/linux/mei_cl_bus.h
@@ -18,6 +18,7 @@ typedef void (*mei_cl_event_cb_t)(struct mei_cl_device *device,
* Drivers for MEI devices will get an mei_cl_device pointer
* when being probed and shall use it for doing ME bus I/O.
*
+ * @bus_list: device on the bus list
* @bus: parent mei device
* @dev: linux driver model device pointer
* @me_cl: me client
@@ -28,9 +29,11 @@ typedef void (*mei_cl_event_cb_t)(struct mei_cl_device *device,
* events (e.g. Rx buffer pending) notifications.
* @event_context: event callback run context
* @events: Events bitmask sent to the driver.
+ * @is_added: device is already scanned
* @priv_data: client private data
*/
struct mei_cl_device {
+ struct list_head bus_list;
struct mei_device *bus;
struct device dev;

@@ -42,6 +45,7 @@ struct mei_cl_device {
mei_cl_event_cb_t event_cb;
void *event_context;
unsigned long events;
+ unsigned int is_added:1;

void *priv_data;
};
--
2.4.3


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