/**
* e1000_write_mbx_vf - Write a message to the mailbox
* @hw: pointer to the HW structure
* @msg: The message buffer
* @size: Length of buffer
*
* returns SUCCESS if it successfully copied message into the buffer
**/
static s32 e1000_write_mbx_vf(struct e1000_hw *hw, u32 *msg, u16 size)
{
s32 err;
u16 i;
/* lock the mailbox to prevent pf/vf race condition */
err = e1000_obtain_mbx_lock_vf(hw);
if (err)
goto out_no_write;
/* flush any ack or msg as we are going to overwrite mailbox */
e1000_check_for_ack_vf(hw);
e1000_check_for_msg_vf(hw);
/* copy the caller specified message to the mailbox memory buffer */
for (i = 0; i < size; i++)
array_ew32(VMBMEM(0), i, msg[i]);
/* update stats */
hw->mbx.stats.msgs_tx++;
/* Drop VFU and interrupt the PF to tell it a message has been sent */
ew32(V2PMAILBOX(0), E1000_V2PMAILBOX_REQ);
out_no_write:
return err;
}
/**
* e1000_read_mbx_vf - Reads a message from the inbox intended for VF
* @hw: pointer to the HW structure
* @msg: The message buffer
* @size: Length of buffer
*
* returns SUCCESS if it successfully read message from buffer
**/
static s32 e1000_read_mbx_vf(struct e1000_hw *hw, u32 *msg, u16 size)
{
s32 err;
u16 i;
WARN_ON_ONCE(!spin_is_locked(&hw->mbx_lock));
/* lock the mailbox to prevent pf/vf race condition */
err = e1000_obtain_mbx_lock_vf(hw);
if (err)
goto out_no_read;
/* copy the message from the mailbox memory buffer */
for (i = 0; i < size; i++)
msg[i] = array_er32(VMBMEM(0), i);
/* Acknowledge receipt and release mailbox, then we're done */
ew32(V2PMAILBOX(0), E1000_V2PMAILBOX_ACK);
/* update stats */
hw->mbx.stats.msgs_rx++;
out_no_read:
return err;
}
/**
* e1000_read_v2p_mailbox - read v2p mailbox
* @hw: pointer to the HW structure
*
* This function is used to read the v2p mailbox without losing the read to
* clear status bits.
**/
static u32 e1000_read_v2p_mailbox(struct e1000_hw *hw)
{
u32 v2p_mailbox = er32(V2PMAILBOX(0));
v2p_mailbox |= hw->dev_spec.vf.v2p_mailbox;
hw->dev_spec.vf.v2p_mailbox |= v2p_mailbox & E1000_V2PMAILBOX_R2C_BITS;
return v2p_mailbox;
}
/**
* e1000_obtain_mbx_lock_vf - obtain mailbox lock
* @hw: pointer to the HW structure
*
* return SUCCESS if we obtained the mailbox lock
**/
static s32 e1000_obtain_mbx_lock_vf(struct e1000_hw *hw)
{
s32 ret_val = -E1000_ERR_MBX;
/* Take ownership of the buffer */
ew32(V2PMAILBOX(0), E1000_V2PMAILBOX_VFU);
/* reserve mailbox for vf use */
if (e1000_read_v2p_mailbox(hw) & E1000_V2PMAILBOX_VFU)
ret_val = E1000_SUCCESS;
return ret_val;
}
/**
* e1000_obtain_mbx_lock_vf - obtain mailbox lock
* @hw: pointer to the HW structure
*
* return SUCCESS if we obtained the mailbox lock
**/
static s32 e1000_obtain_mbx_lock_vf(struct e1000_hw *hw)
{
s32 ret_val = -E1000_ERR_MBX;
int count = 10;
do {
/* Take ownership of the buffer */
ew32(V2PMAILBOX(0), E1000_V2PMAILBOX_VFU);
/* reserve mailbox for VF use */
if (e1000_read_v2p_mailbox(hw) & E1000_V2PMAILBOX_VFU) {
ret_val = 0;
break;
}
udelay(1000);
} while (count-- > 0);
return ret_val;
}
