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mei: don't query HCSR for host buffer depth 

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tomas Winkler 2012-06-25 23:46:27 +03:00 committed by Greg Kroah-Hartman
parent 21c66d1be7
commit 24aadc809f
7 changed files with 24 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/misc/mei/init.c
View File

@ -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");

7
drivers/misc/mei/interface.c
View File

@ -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;

6
drivers/misc/mei/interface.h
View File

@ -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);

6
drivers/misc/mei/interrupt.c
View File

@ -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;

8
drivers/misc/mei/iorw.c
View File

@ -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;

9
drivers/misc/mei/main.c
View File

@ -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;

6
drivers/misc/mei/mei_dev.h
View File

@ -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
*/