linux-kernel - [char-misc-next 04/12] mei: restrict dma ring support to hbm version 2.1

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Message-Id: <20180731063544.25540-5-tomas.winkler@intel.com>
Date:   Tue, 31 Jul 2018 09:35:36 +0300
From:   Tomas Winkler <tomas.winkler@...el.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Alexander Usyskin <alexander.usyskin@...el.com>,
        linux-kernel@...r.kernel.org,
        Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc-next 04/12] mei: restrict dma ring support to hbm version 2.1

Only a firmware with version 2.1 and above supports dma ring feature.

Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>
---
 drivers/misc/mei/debugfs.c | 2 ++
 drivers/misc/mei/hbm.c     | 6 ++++++
 drivers/misc/mei/hw.h      | 6 ++++++
 drivers/misc/mei/mei_dev.h | 2 ++
 4 files changed, 16 insertions(+)

diff --git a/drivers/misc/mei/debugfs.c b/drivers/misc/mei/debugfs.c
index c815da91089c..7b5df8fd6c5a 100644
--- a/drivers/misc/mei/debugfs.c
+++ b/drivers/misc/mei/debugfs.c
@@ -183,6 +183,8 @@ static ssize_t mei_dbgfs_read_devstate(struct file *fp, char __user *ubuf,
 				 dev->hbm_f_fa_supported);
 		pos += scnprintf(buf + pos, bufsz - pos, "\tOS: %01d\n",
 				 dev->hbm_f_os_supported);
+		pos += scnprintf(buf + pos, bufsz - pos, "\tDR: %01d\n",
+				 dev->hbm_f_dr_supported);
 	}
 
 	pos += scnprintf(buf + pos, bufsz - pos, "pg:  %s, %s\n",
diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index b0086c4aefe4..09e233d4c0de 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -1007,6 +1007,12 @@ static void mei_hbm_config_features(struct mei_device *dev)
 	/* OS ver message Support */
 	if (dev->version.major_version >= HBM_MAJOR_VERSION_OS)
 		dev->hbm_f_os_supported = 1;
+
+	/* DMA Ring Support */
+	if (dev->version.major_version > HBM_MAJOR_VERSION_DR ||
+	    (dev->version.major_version == HBM_MAJOR_VERSION_DR &&
+	     dev->version.minor_version >= HBM_MINOR_VERSION_DR))
+		dev->hbm_f_dr_supported = 1;
 }
 
 /**
diff --git a/drivers/misc/mei/hw.h b/drivers/misc/mei/hw.h
index 5fb8844a6db5..65655925791a 100644
--- a/drivers/misc/mei/hw.h
+++ b/drivers/misc/mei/hw.h
@@ -80,6 +80,12 @@
 #define HBM_MINOR_VERSION_OS               0
 #define HBM_MAJOR_VERSION_OS               2
 
+/*
+ * MEI version with dma ring support
+ */
+#define HBM_MINOR_VERSION_DR               1
+#define HBM_MAJOR_VERSION_DR               2
+
 /* Host bus message command opcode */
 #define MEI_HBM_CMD_OP_MSK                  0x7f
 /* Host bus message command RESPONSE */
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 975afaa38a66..377397e1b5a5 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -418,6 +418,7 @@ struct mei_fw_version {
  * @hbm_f_fa_supported  : hbm feature fixed address client
  * @hbm_f_ie_supported  : hbm feature immediate reply to enum request
  * @hbm_f_os_supported  : hbm feature support OS ver message
+ * @hbm_f_dr_supported  : hbm feature dma ring supported
  *
  * @fw_ver : FW versions
  *
@@ -495,6 +496,7 @@ struct mei_device {
 	unsigned int hbm_f_fa_supported:1;
 	unsigned int hbm_f_ie_supported:1;
 	unsigned int hbm_f_os_supported:1;
+	unsigned int hbm_f_dr_supported:1;
 
 	struct mei_fw_version fw_ver[MEI_MAX_FW_VER_BLOCKS];
 
-- 
2.14.4