Commit 5d5bc189 authored by Tomas Winkler's avatar Tomas Winkler Committed by Daniele Ceraolo Spurio
Browse files

mei: bus: enable sending gsc commands 



GSC command is and extended header containing a scatter gather
list and without a data buffer. Using MEI_CL_IO_SGL flag,
the caller send the GSC command as a data and the function internally
moves it to the extended header.

Signed-off-by: default avatarTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: default avatarDaniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Vitaly Lubart <vitaly.lubart@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220928004145.745803-3-daniele.ceraolospurio@intel.com
parent 4ed1cc99

drivers/misc/mei/bus.c

+18 −2
Original line number Diff line number Diff line
@@ -100,9 +100,18 @@ ssize_t __mei_cl_send(struct mei_cl *cl, const u8 *buf, size_t length, u8 vtag, 
	cb->internal = !!(mode & MEI_CL_IO_TX_INTERNAL);

	cb->blocking = !!(mode & MEI_CL_IO_TX_BLOCKING);

	memcpy(cb->buf.data, buf, length);

	/* hack we point data to header */

	if (mode & MEI_CL_IO_SGL) {

		cb->ext_hdr = (struct mei_ext_hdr *)cb->buf.data;

		cb->buf.data = NULL;

		cb->buf.size = 0;

	}



	rets = mei_cl_write(cl, cb);



	if (mode & MEI_CL_IO_SGL && rets == 0)

		rets = length;



out:

	mutex_unlock(&bus->device_lock);
@@ -205,9 +214,16 @@ ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length, u8 *vtag, 
		goto free;

	}



	/* for the GSC type - copy the extended header to the buffer */

	if (cb->ext_hdr && cb->ext_hdr->type == MEI_EXT_HDR_GSC) {

		r_length = min_t(size_t, length, cb->ext_hdr->length * sizeof(u32));

		memcpy(buf, cb->ext_hdr, r_length);

	} else {

		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;

drivers/misc/mei/mei_dev.h

+4 −0
Original line number Diff line number Diff line
@@ -116,12 +116,16 @@ enum mei_cb_file_ops { 
 * @MEI_CL_IO_TX_INTERNAL: internal communication between driver and FW

 *

 * @MEI_CL_IO_RX_NONBLOCK: recv is non-blocking

 *

 * @MEI_CL_IO_SGL: send command with sgl list.

 */

enum mei_cl_io_mode {

	MEI_CL_IO_TX_BLOCKING = BIT(0),

	MEI_CL_IO_TX_INTERNAL = BIT(1),



	MEI_CL_IO_RX_NONBLOCK = BIT(2),



	MEI_CL_IO_SGL         = BIT(3),

};



/*