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Subject[char-misc-next 03/12] mei: hbm: introduce dma bit in the message header
Date
Add dma_ring bit in the mei message header for conveying
that the message data itself are on the dma ring.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
---
drivers/misc/mei/client.c | 1 +
drivers/misc/mei/hbm.c | 1 +
drivers/misc/mei/hw.h | 16 ++++++++++++----
drivers/misc/mei/mei_dev.h | 4 ++--
4 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index 0a9173827461..4ab6251d418e 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -1551,6 +1551,7 @@ static void mei_msg_hdr_init(struct mei_msg_hdr *mei_hdr, struct mei_cl_cb *cb)
mei_hdr->length = 0;
mei_hdr->reserved = 0;
mei_hdr->msg_complete = 0;
+ mei_hdr->dma_ring = 0;
mei_hdr->internal = cb->internal;
}

diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index 8b3fd9ff6566..b0086c4aefe4 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -145,6 +145,7 @@ static inline void mei_hbm_hdr(struct mei_msg_hdr *hdr, size_t length)
hdr->me_addr = 0;
hdr->length = length;
hdr->msg_complete = 1;
+ hdr->dma_ring = 0;
hdr->reserved = 0;
hdr->internal = 0;
}
diff --git a/drivers/misc/mei/hw.h b/drivers/misc/mei/hw.h
index 76fb502e6f71..5fb8844a6db5 100644
--- a/drivers/misc/mei/hw.h
+++ b/drivers/misc/mei/hw.h
@@ -190,19 +190,27 @@ enum mei_cl_disconnect_status {
MEI_CL_DISCONN_SUCCESS = MEI_HBMS_SUCCESS
};

-/*
- * MEI BUS Interface Section
+/**
+ * struct mei_msg_hdr - MEI BUS Interface Section
+ *
+ * @me_addr: device address
+ * @host_addr: host address
+ * @length: message length
+ * @reserved: reserved
+ * @dma_ring: message is on dma ring
+ * @internal: message is internal
+ * @msg_complete: last packet of the message
*/
struct mei_msg_hdr {
u32 me_addr:8;
u32 host_addr:8;
u32 length:9;
- u32 reserved:5;
+ u32 reserved:4;
+ u32 dma_ring:1;
u32 internal:1;
u32 msg_complete:1;
} __packed;

-
struct mei_bus_message {
u8 hbm_cmd;
u8 data[0];
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 06fb5fc67fe9..975afaa38a66 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -714,10 +714,10 @@ static inline void mei_dbgfs_deregister(struct mei_device *dev) {}
int mei_register(struct mei_device *dev, struct device *parent);
void mei_deregister(struct mei_device *dev);

-#define MEI_HDR_FMT "hdr:host=%02d me=%02d len=%d internal=%1d comp=%1d"
+#define MEI_HDR_FMT "hdr:host=%02d me=%02d len=%d dma=%1d internal=%1d comp=%1d"
#define MEI_HDR_PRM(hdr) \
(hdr)->host_addr, (hdr)->me_addr, \
- (hdr)->length, (hdr)->internal, (hdr)->msg_complete
+ (hdr)->length, (hdr)->dma_ring, (hdr)->internal, (hdr)->msg_complete

ssize_t mei_fw_status2str(struct mei_fw_status *fw_sts, char *buf, size_t len);
/**
--
2.14.4
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