mei: hbm: add capabilities message

The new capabilities command in HBM version 2.2 allows
performing capabilities handshake between the firmware
and the host driver. The driver requests a capability
by setting the appropriate bit in 24bit wide bitmask and
the fw responses with the bit set providing the requested
capability is supported.

Bump copyright year in affected files.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Link: https://lore.kernel.org/r/20200818115147.2567012-2-tomas.winkler@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 72 insertions, 0 deletions

diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index 308caee86920..3a227d9363d5 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -326,6 +326,37 @@ static int mei_hbm_dma_setup_req(struct mei_device *dev)
 }
 
 /**
+ * mei_hbm_capabilities_req - request capabilities
+ *
+ * @dev: the device structure
+ *
+ * Return: 0 on success and < 0 on failure
+ */
+static int mei_hbm_capabilities_req(struct mei_device *dev)
+{
+	struct mei_msg_hdr mei_hdr;
+	struct hbm_capability_request req;
+	int ret;
+
+	mei_hbm_hdr(&mei_hdr, sizeof(req));
+
+	memset(&req, 0, sizeof(req));
+	req.hbm_cmd = MEI_HBM_CAPABILITIES_REQ_CMD;
+
+	ret = mei_hbm_write_message(dev, &mei_hdr, &req);
+	if (ret) {
+		dev_err(dev->dev,
+			"capabilities request write failed: ret = %d.\n", ret);
+		return ret;
+	}
+
+	dev->hbm_state = MEI_HBM_CAP_SETUP;
+	dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
+	mei_schedule_stall_timer(dev);
+	return 0;
+}
+
+/**
  * mei_hbm_enum_clients_req - sends enumeration client request message.
  *
  * @dev: the device structure
@@ -1042,6 +1073,12 @@ static void mei_hbm_config_features(struct mei_device *dev)
 	    (dev->version.major_version == HBM_MAJOR_VERSION_DR &&
 	     dev->version.minor_version >= HBM_MINOR_VERSION_DR))
 		dev->hbm_f_dr_supported = 1;
+
+	dev->hbm_f_cap_supported = 0;
+	if (dev->version.major_version > HBM_MAJOR_VERSION_CAP ||
+	    (dev->version.major_version == HBM_MAJOR_VERSION_CAP &&
+	     dev->version.minor_version >= HBM_MINOR_VERSION_CAP))
+		dev->hbm_f_cap_supported = 1;
 }
 
 /**
@@ -1138,6 +1175,13 @@ int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
 			return -EPROTO;
 		}
 
+		if (dev->hbm_f_cap_supported) {
+			if (mei_hbm_capabilities_req(dev))
+				return -EIO;
+			wake_up(&dev->wait_hbm_start);
+			break;
+		}
+
 		if (dev->hbm_f_dr_supported) {
 			if (mei_dmam_ring_alloc(dev))
 				dev_info(dev->dev, "running w/o dma ring\n");
@@ -1159,6 +1203,34 @@ int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
 		wake_up(&dev->wait_hbm_start);
 		break;
 
+	case MEI_HBM_CAPABILITIES_RES_CMD:
+		dev_dbg(dev->dev, "hbm: capabilities response: message received.\n");
+
+		dev->init_clients_timer = 0;
+
+		if (dev->hbm_state != MEI_HBM_CAP_SETUP) {
+			dev_err(dev->dev, "hbm: capabilities response: state mismatch, [%d, %d]\n",
+				dev->dev_state, dev->hbm_state);
+			return -EPROTO;
+		}
+
+		if (dev->hbm_f_dr_supported) {
+			if (mei_dmam_ring_alloc(dev))
+				dev_info(dev->dev, "running w/o dma ring\n");
+			if (mei_dma_ring_is_allocated(dev)) {
+				if (mei_hbm_dma_setup_req(dev))
+					return -EIO;
+				break;
+			}
+		}
+
+		dev->hbm_f_dr_supported = 0;
+		mei_dmam_ring_free(dev);
+
+		if (mei_hbm_enum_clients_req(dev))
+			return -EIO;
+		break;
+
 	case MEI_HBM_DMA_SETUP_RES_CMD:
 		dev_dbg(dev->dev, "hbm: dma setup response: message received.\n");