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mei: don't query HCSR for host buffer depth

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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
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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
*/