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mei: bus: enable sending gsc commands

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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: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Vitaly Lubart <vitaly.lubart@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220928004145.745803-3-daniele.ceraolospurio@intel.com
This commit is contained in:
Tomas Winkler
2022-09-27 17:41:32 -07:00
committed by Daniele Ceraolo Spurio
parent 4ed1cc997f
commit 5d5bc18971
2 changed files with 22 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/misc/mei/bus.c
View File

@@ -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;
}
r_length = min_t(size_t, length, cb->buf_idx);
memcpy(buf, cb->buf.data, r_length);
/* 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;

4
drivers/misc/mei/mei_dev.h
View File

@@ -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),
};
/*