[PATCH 02/15] mei: bus: enable sending gsc commands
Daniele Ceraolo Spurio
daniele.ceraolospurio at intel.com
Mon Sep 12 17:56:51 UTC 2022
From: Tomas Winkler <tomas.winkler at intel.com>
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 at intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Cc: Vitaly Lubart <vitaly.lubart at intel.com>
Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
drivers/misc/mei/bus.c | 20 ++++++++++++++++++--
drivers/misc/mei/mei_dev.h | 4 ++++
2 files changed, 22 insertions(+), 2 deletions(-)
diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
index 46aa3554e97b..225f0b04c021 100644
--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -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;
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 31784bbc2d2a..8d8018428d9d 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -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),
};
/*
--
2.37.2
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