From: Tomas Winkler <tomas.winkler@intel.com>
To: gregkh@linuxfoundation.org
Cc: arnd@arndb.de, alan@linux.intel.com,
linux-kernel@vger.kernel.org,
Tomas Winkler <tomas.winkler@intel.com>
Subject: [char-misc-next 1/2] mei: don't query HCSR for host buffer depth
Date: Mon, 25 Jun 2012 23:46:27 +0300 [thread overview]
Message-ID: <1340657188-16953-1-git-send-email-tomas.winkler@intel.com> (raw)
1. We record host (write) buffer depth during reset
so we don't need to query HCSR register later on.
The host buffer depth doesn't change after the reset
2. Use mei_hbuf_max_data function to compute payload size in bytes
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
drivers/misc/mei/init.c | 3 +++
drivers/misc/mei/interface.c | 7 +++----
drivers/misc/mei/interface.h | 6 ++++++
drivers/misc/mei/interrupt.c | 6 +++---
drivers/misc/mei/iorw.c | 8 ++------
drivers/misc/mei/main.c | 9 ++-------
drivers/misc/mei/mei_dev.h | 6 +++++-
7 files changed, 24 insertions(+), 21 deletions(-)
diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c
index a7d0bb0..d39b277 100644
--- a/drivers/misc/mei/init.c
+++ b/drivers/misc/mei/init.c
@@ -162,6 +162,9 @@ int mei_hw_init(struct mei_device *dev)
if ((dev->host_hw_state & H_IS) == H_IS)
mei_reg_write(dev, H_CSR, dev->host_hw_state);
+ /* Doesn't change in runtime */
+ dev->hbuf_depth = (dev->host_hw_state & H_CBD) >> 24;
+
dev->recvd_msg = false;
dev_dbg(&dev->pdev->dev, "reset in start the mei device.\n");
diff --git a/drivers/misc/mei/interface.c b/drivers/misc/mei/interface.c
index 6c05691..784a606 100644
--- a/drivers/misc/mei/interface.c
+++ b/drivers/misc/mei/interface.c
@@ -103,15 +103,14 @@ int mei_host_buffer_is_empty(struct mei_device *dev)
*/
int mei_count_empty_write_slots(struct mei_device *dev)
{
- unsigned char buffer_depth, filled_slots, empty_slots;
+ unsigned char filled_slots, empty_slots;
dev->host_hw_state = mei_hcsr_read(dev);
- buffer_depth = (unsigned char) ((dev->host_hw_state & H_CBD) >> 24);
filled_slots = _host_get_filled_slots(dev);
- empty_slots = buffer_depth - filled_slots;
+ empty_slots = dev->hbuf_depth - filled_slots;
/* check for overflow */
- if (filled_slots > buffer_depth)
+ if (filled_slots > dev->hbuf_depth)
return -EOVERFLOW;
return empty_slots;
diff --git a/drivers/misc/mei/interface.h b/drivers/misc/mei/interface.h
index ddff5d1..8723d88 100644
--- a/drivers/misc/mei/interface.h
+++ b/drivers/misc/mei/interface.h
@@ -49,6 +49,12 @@ int mei_count_empty_write_slots(struct mei_device *dev);
int mei_flow_ctrl_creds(struct mei_device *dev, struct mei_cl *cl);
+static inline size_t mei_hbuf_max_data(const struct mei_device *dev)
+{
+ return dev->hbuf_depth * sizeof(u32) - sizeof(struct mei_msg_hdr);
+}
+
+
int mei_wd_send(struct mei_device *dev);
int mei_wd_stop(struct mei_device *dev, bool preserve);
int mei_wd_host_init(struct mei_device *dev);
diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index 7ea0254..ebf97d3 100644
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -951,7 +951,7 @@ static int _mei_irq_thread_cmpl(struct mei_device *dev, s32 *slots,
list_move_tail(&cb_pos->cb_list,
&dev->write_waiting_list.mei_cb.cb_list);
}
- } else if (*slots == ((dev->host_hw_state & H_CBD) >> 24)) {
+ } else if (*slots == dev->hbuf_depth) {
/* buffer is still empty */
mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
mei_hdr->host_addr = cl->host_client_id;
@@ -1046,8 +1046,8 @@ static int _mei_irq_thread_cmpl_iamthif(struct mei_device *dev, s32 *slots,
&dev->write_waiting_list.mei_cb.cb_list);
}
- } else if (*slots == ((dev->host_hw_state & H_CBD) >> 24)) {
- /* buffer is still empty */
+ } else if (*slots == dev->hbuf_depth) {
+ /* buffer is still empty */
mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
mei_hdr->host_addr = cl->host_client_id;
mei_hdr->me_addr = cl->me_client_id;
diff --git a/drivers/misc/mei/iorw.c b/drivers/misc/mei/iorw.c
index f9cced6..50f52e2 100644
--- a/drivers/misc/mei/iorw.c
+++ b/drivers/misc/mei/iorw.c
@@ -481,12 +481,8 @@ int amthi_write(struct mei_device *dev, struct mei_cl_cb *cb)
if (ret && dev->mei_host_buffer_is_empty) {
ret = 0;
dev->mei_host_buffer_is_empty = false;
- if (cb->request_buffer.size >
- (((dev->host_hw_state & H_CBD) >> 24) * sizeof(u32))
- -sizeof(struct mei_msg_hdr)) {
- mei_hdr.length =
- (((dev->host_hw_state & H_CBD) >> 24) *
- sizeof(u32)) - sizeof(struct mei_msg_hdr);
+ if (cb->request_buffer.size > mei_hbuf_max_data(dev)) {
+ mei_hdr.length = mei_hbuf_max_data(dev);
mei_hdr.msg_complete = 0;
} else {
mei_hdr.length = cb->request_buffer.size;
diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c
index 7de1389..1c1df04 100644
--- a/drivers/misc/mei/main.c
+++ b/drivers/misc/mei/main.c
@@ -714,13 +714,8 @@ static ssize_t mei_write(struct file *file, const char __user *ubuf,
if (rets && dev->mei_host_buffer_is_empty) {
rets = 0;
dev->mei_host_buffer_is_empty = false;
- if (length > ((((dev->host_hw_state & H_CBD) >> 24) *
- sizeof(u32)) - sizeof(struct mei_msg_hdr))) {
-
- mei_hdr.length =
- (((dev->host_hw_state & H_CBD) >> 24) *
- sizeof(u32)) -
- sizeof(struct mei_msg_hdr);
+ if (length > mei_hbuf_max_data(dev)) {
+ mei_hdr.length = mei_hbuf_max_data(dev);
mei_hdr.msg_complete = 0;
} else {
mei_hdr.length = length;
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 4fe6533..d60250d 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -167,7 +167,10 @@ struct mei_io_list {
struct mei_cl_cb mei_cb;
};
-/* MEI private device struct */
+/**
+ * struct mei_deive - MEI private device struct
+ * @hbuf_depth - depth of host(write) buffer
+ */
struct mei_device {
struct pci_dev *pdev; /* pointer to pci device struct */
/*
@@ -205,6 +208,7 @@ struct mei_device {
*/
u32 host_hw_state;
u32 me_hw_state;
+ u8 hbuf_depth;
/*
* waiting queue for receive message from FW
*/
--
1.7.4.4
next reply other threads:[~2012-06-25 20:46 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-25 20:46 Tomas Winkler [this message]
2012-06-25 20:46 ` [char-misc-next 2/2] mei: revamp host buffer interface function Tomas Winkler
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