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authorAlexander Usyskin <alexander.usyskin@intel.com>2020-11-16 14:56:11 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-12-07 10:29:57 +0100
commit85261c1ff156eb60fc26c378748387f2e85c6878 (patch)
tree6e487243c332131f5c2fbd31f7b99f7fce924f66 /drivers/misc/mei/bus.c
parent6e559fe128927cc414406b63eb92ea16e673f43d (diff)
downloadlinux-85261c1ff156eb60fc26c378748387f2e85c6878.tar.bz2
mei: bus: add vtag support
Add API to support vtag in communication on mei bus. Add mei_cldev_send_vtag, mei_cldev_recv_vtag and mei_cldev_recv_nonblock_vtag functions to allow sending a message with vtag set and to receive vtag of an incoming message. Cc: Sean Z Huang <sean.z.huang@intel.com> Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Link: https://lore.kernel.org/r/20201116125612.1660971-1-tomas.winkler@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/mei/bus.c')
-rw-r--r--drivers/misc/mei/bus.c101
1 files changed, 84 insertions, 17 deletions
diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
index 7fe48baa103a..2907db260fba 100644
--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -26,11 +26,12 @@
* @cl: host client
* @buf: buffer to send
* @length: buffer length
+ * @vtag: virtual tag
* @mode: sending mode
*
* Return: written size bytes or < 0 on error
*/
-ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
+ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length, u8 vtag,
unsigned int mode)
{
struct mei_device *bus;
@@ -86,6 +87,7 @@ ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
rets = -ENOMEM;
goto out;
}
+ cb->vtag = vtag;
cb->internal = !!(mode & MEI_CL_IO_TX_INTERNAL);
cb->blocking = !!(mode & MEI_CL_IO_TX_BLOCKING);
@@ -106,11 +108,12 @@ out:
* @buf: buffer to receive
* @length: buffer length
* @mode: io mode
+ * @vtag: virtual tag
* @timeout: recv timeout, 0 for infinite timeout
*
* Return: read size in bytes of < 0 on error
*/
-ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length,
+ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length, u8 *vtag,
unsigned int mode, unsigned long timeout)
{
struct mei_device *bus;
@@ -196,6 +199,8 @@ copy:
r_length = min_t(size_t, length, cb->buf_idx);
memcpy(buf, cb->buf.data, r_length);
rets = r_length;
+ if (vtag)
+ *vtag = cb->vtag;
free:
mei_cl_del_rd_completed(cl, cb);
@@ -206,40 +211,87 @@ out:
}
/**
- * mei_cldev_send - me device send (write)
+ * mei_cldev_send_vtag - me device send with vtag (write)
*
* @cldev: me client device
* @buf: buffer to send
* @length: buffer length
+ * @vtag: virtual tag
*
- * Return: written size in bytes or < 0 on error
+ * Return:
+ * * written size in bytes
+ * * < 0 on error
*/
-ssize_t mei_cldev_send(struct mei_cl_device *cldev, u8 *buf, size_t length)
+
+ssize_t mei_cldev_send_vtag(struct mei_cl_device *cldev, u8 *buf, size_t length,
+ u8 vtag)
{
struct mei_cl *cl = cldev->cl;
- return __mei_cl_send(cl, buf, length, MEI_CL_IO_TX_BLOCKING);
+ return __mei_cl_send(cl, buf, length, vtag, MEI_CL_IO_TX_BLOCKING);
}
-EXPORT_SYMBOL_GPL(mei_cldev_send);
+EXPORT_SYMBOL_GPL(mei_cldev_send_vtag);
/**
- * mei_cldev_recv_nonblock - non block client receive (read)
+ * mei_cldev_recv_vtag - client receive with vtag (read)
*
* @cldev: me client device
* @buf: buffer to receive
* @length: buffer length
+ * @vtag: virtual tag
*
- * Return: read size in bytes of < 0 on error
- * -EAGAIN if function will block.
+ * Return:
+ * * read size in bytes
+ * * < 0 on error
*/
-ssize_t mei_cldev_recv_nonblock(struct mei_cl_device *cldev, u8 *buf,
- size_t length)
+
+ssize_t mei_cldev_recv_vtag(struct mei_cl_device *cldev, u8 *buf, size_t length,
+ u8 *vtag)
{
struct mei_cl *cl = cldev->cl;
- return __mei_cl_recv(cl, buf, length, MEI_CL_IO_RX_NONBLOCK, 0);
+ return __mei_cl_recv(cl, buf, length, vtag, 0, 0);
}
-EXPORT_SYMBOL_GPL(mei_cldev_recv_nonblock);
+EXPORT_SYMBOL_GPL(mei_cldev_recv_vtag);
+
+/**
+ * mei_cldev_recv_nonblock_vtag - non block client receive with vtag (read)
+ *
+ * @cldev: me client device
+ * @buf: buffer to receive
+ * @length: buffer length
+ * @vtag: virtual tag
+ *
+ * Return:
+ * * read size in bytes
+ * * -EAGAIN if function will block.
+ * * < 0 on other error
+ */
+ssize_t mei_cldev_recv_nonblock_vtag(struct mei_cl_device *cldev, u8 *buf,
+ size_t length, u8 *vtag)
+{
+ struct mei_cl *cl = cldev->cl;
+
+ return __mei_cl_recv(cl, buf, length, vtag, MEI_CL_IO_RX_NONBLOCK, 0);
+}
+EXPORT_SYMBOL_GPL(mei_cldev_recv_nonblock_vtag);
+
+/**
+ * mei_cldev_send - me device send (write)
+ *
+ * @cldev: me client device
+ * @buf: buffer to send
+ * @length: buffer length
+ *
+ * Return:
+ * * written size in bytes
+ * * < 0 on error
+ */
+ssize_t mei_cldev_send(struct mei_cl_device *cldev, u8 *buf, size_t length)
+{
+ return mei_cldev_send_vtag(cldev, buf, length, 0);
+}
+EXPORT_SYMBOL_GPL(mei_cldev_send);
/**
* mei_cldev_recv - client receive (read)
@@ -252,13 +304,28 @@ EXPORT_SYMBOL_GPL(mei_cldev_recv_nonblock);
*/
ssize_t mei_cldev_recv(struct mei_cl_device *cldev, u8 *buf, size_t length)
{
- struct mei_cl *cl = cldev->cl;
-
- return __mei_cl_recv(cl, buf, length, 0, 0);
+ return mei_cldev_recv_vtag(cldev, buf, length, NULL);
}
EXPORT_SYMBOL_GPL(mei_cldev_recv);
/**
+ * mei_cldev_recv_nonblock - non block client receive (read)
+ *
+ * @cldev: me client device
+ * @buf: buffer to receive
+ * @length: buffer length
+ *
+ * Return: read size in bytes of < 0 on error
+ * -EAGAIN if function will block.
+ */
+ssize_t mei_cldev_recv_nonblock(struct mei_cl_device *cldev, u8 *buf,
+ size_t length)
+{
+ return mei_cldev_recv_nonblock_vtag(cldev, buf, length, NULL);
+}
+EXPORT_SYMBOL_GPL(mei_cldev_recv_nonblock);
+
+/**
* mei_cl_bus_rx_work - dispatch rx event for a bus device
*
* @work: work