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Message-Id: <1353244400-9619-2-git-send-email-tomas.winkler@intel.com>
Date: Sun, 18 Nov 2012 15:13:15 +0200
From: Tomas Winkler <tomas.winkler@...el.com>
To: gregkh@...uxfoundation.org
Cc: arnd@...db.de, alan@...ux.intel.com, linux-kernel@...r.kernel.org,
Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc-next 2/7] mei: use structured buffer for extra write buffer
The structure of the message is static so we don't have
to use and cast the buffer. We can also drop extra_write_index
variable as this information can be extracted directly
from the message header
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
drivers/misc/mei/init.c | 2 +-
drivers/misc/mei/interrupt.c | 36 ++++++++++++++----------------------
drivers/misc/mei/mei_dev.h | 11 +++++++----
3 files changed, 22 insertions(+), 27 deletions(-)
diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c
index 02784af..49600d6 100644
--- a/drivers/misc/mei/init.c
+++ b/drivers/misc/mei/init.c
@@ -288,7 +288,7 @@ void mei_reset(struct mei_device *dev, int interrupts_enabled)
mei_me_cl_unlink(dev, &dev->iamthif_cl);
mei_amthif_reset_params(dev);
- dev->extra_write_index = 0;
+ memset(&dev->wr_ext_msg, 0, sizeof(dev->wr_ext_msg));
}
dev->me_clients_num = 0;
diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index 14becc0..9224646 100644
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -446,15 +446,14 @@ static void mei_client_disconnect_request(struct mei_device *dev,
dev->iamthif_timer = 0;
/* prepare disconnect response */
- (void)mei_hbm_hdr(&dev->ext_msg_buf[0], len);
+ (void)mei_hbm_hdr((u32 *)&dev->wr_ext_msg.hdr, len);
disconnect_res =
(struct hbm_client_connect_response *)
- &dev->ext_msg_buf[1];
+ &dev->wr_ext_msg.data;
disconnect_res->hbm_cmd = CLIENT_DISCONNECT_RES_CMD;
disconnect_res->host_addr = pos->host_client_id;
disconnect_res->me_addr = pos->me_client_id;
disconnect_res->status = 0;
- dev->extra_write_index = 2;
break;
}
}
@@ -643,16 +642,13 @@ static void mei_irq_thread_read_bus_message(struct mei_device *dev,
{
/* prepare stop request: sent in next interrupt event */
- u32 *buf = dev->ext_msg_buf;
const size_t len = sizeof(struct hbm_host_stop_request);
- mei_hdr = mei_hbm_hdr(&buf[0], len);
- stop_req = (struct hbm_host_stop_request *)&buf[1];
+ mei_hdr = mei_hbm_hdr((u32 *)&dev->wr_ext_msg.hdr, len);
+ stop_req = (struct hbm_host_stop_request *)&dev->wr_ext_msg.data;
memset(stop_req, 0, len);
stop_req->hbm_cmd = HOST_STOP_REQ_CMD;
stop_req->reason = DRIVER_STOP_REQUEST;
-
- dev->extra_write_index = 2;
break;
}
default:
@@ -988,15 +984,11 @@ static int mei_irq_thread_write_handler(struct mei_cl_cb *cmpl_list,
wake_up_interruptible(&dev->wait_stop_wd);
}
- if (dev->extra_write_index) {
- dev_dbg(&dev->pdev->dev, "extra_write_index =%d.\n",
- dev->extra_write_index);
- mei_write_message(dev,
- (struct mei_msg_hdr *) &dev->ext_msg_buf[0],
- (unsigned char *) &dev->ext_msg_buf[1],
- (dev->extra_write_index - 1) * sizeof(u32));
- *slots -= dev->extra_write_index;
- dev->extra_write_index = 0;
+ if (dev->wr_ext_msg.hdr.length) {
+ mei_write_message(dev, &dev->wr_ext_msg.hdr,
+ dev->wr_ext_msg.data, dev->wr_ext_msg.hdr.length);
+ *slots -= mei_data2slots(dev->wr_ext_msg.hdr.length);
+ dev->wr_ext_msg.hdr.length = 0;
}
if (dev->dev_state == MEI_DEV_ENABLED) {
if (dev->wd_pending &&
@@ -1263,11 +1255,11 @@ irqreturn_t mei_interrupt_thread_handler(int irq, void *dev_id)
}
/* check slots available for reading */
slots = mei_count_full_read_slots(dev);
- dev_dbg(&dev->pdev->dev, "slots =%08x extra_write_index =%08x.\n",
- slots, dev->extra_write_index);
- while (slots > 0 && !dev->extra_write_index) {
- dev_dbg(&dev->pdev->dev, "slots =%08x extra_write_index =%08x.\n",
- slots, dev->extra_write_index);
+ while (slots > 0) {
+ /* we have urgent data to send so break the read */
+ if (dev->wr_ext_msg.hdr.length)
+ break;
+ dev_dbg(&dev->pdev->dev, "slots =%08x\n", slots);
dev_dbg(&dev->pdev->dev, "call mei_irq_thread_read_handler.\n");
rets = mei_irq_thread_read_handler(&complete_list, dev, &slots);
if (rets)
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index e511b84..2a38e95 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -192,8 +192,9 @@ struct mei_cl {
};
/**
- * struct mei_deive - MEI private device struct
+ * struct mei_device - MEI private device struct
* @hbuf_depth - depth of host(write) buffer
+ * @wr_ext_msg - buffer for hbm control responses (set in read cycle)
*/
struct mei_device {
struct pci_dev *pdev; /* pointer to pci device struct */
@@ -244,11 +245,13 @@ struct mei_device {
u16 init_clients_timer;
bool need_reset;
- u32 extra_write_index;
unsigned char rd_msg_buf[MEI_RD_MSG_BUF_SIZE]; /* control messages */
- u32 wr_msg_buf[128]; /* used for control messages */
- u32 ext_msg_buf[8]; /* for control responses */
u32 rd_msg_hdr;
+ u32 wr_msg_buf[128]; /* used for control messages */
+ struct {
+ struct mei_msg_hdr hdr;
+ unsigned char data[4]; /* All HBM messages are 4 bytes */
+ } wr_ext_msg; /* for control responses */
struct hbm_version version;
--
1.7.4.4
--
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