mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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9ce0e8d726
The driver shouldn't just give up if it fails to get the hardware mailbox lock. This can happen in a situation where the PF-VF communication channel is heavily loaded and causes complete communications failure between the PF and VF drivers. Add a counter and a delay. The driver will now retry ten times, waiting one millisecond between retries. Signed-off-by: Mitch Williams <mitch.a.williams@intel.com> Tested-by: Aaron Brown <aaron.f.brown@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
356 lines
8.9 KiB
C
356 lines
8.9 KiB
C
/*******************************************************************************
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Intel(R) 82576 Virtual Function Linux driver
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Copyright(c) 2009 - 2012 Intel Corporation.
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This program is free software; you can redistribute it and/or modify it
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under the terms and conditions of the GNU General Public License,
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version 2, as published by the Free Software Foundation.
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This program is distributed in the hope it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, see <http://www.gnu.org/licenses/>.
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The full GNU General Public License is included in this distribution in
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the file called "COPYING".
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Contact Information:
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e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
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Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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*******************************************************************************/
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#include "mbx.h"
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/**
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* e1000_poll_for_msg - Wait for message notification
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* @hw: pointer to the HW structure
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*
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* returns SUCCESS if it successfully received a message notification
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**/
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static s32 e1000_poll_for_msg(struct e1000_hw *hw)
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{
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struct e1000_mbx_info *mbx = &hw->mbx;
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int countdown = mbx->timeout;
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if (!mbx->ops.check_for_msg)
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goto out;
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while (countdown && mbx->ops.check_for_msg(hw)) {
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countdown--;
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udelay(mbx->usec_delay);
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}
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/* if we failed, all future posted messages fail until reset */
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if (!countdown)
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mbx->timeout = 0;
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out:
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return countdown ? E1000_SUCCESS : -E1000_ERR_MBX;
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}
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/**
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* e1000_poll_for_ack - Wait for message acknowledgment
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* @hw: pointer to the HW structure
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*
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* returns SUCCESS if it successfully received a message acknowledgment
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**/
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static s32 e1000_poll_for_ack(struct e1000_hw *hw)
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{
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struct e1000_mbx_info *mbx = &hw->mbx;
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int countdown = mbx->timeout;
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if (!mbx->ops.check_for_ack)
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goto out;
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while (countdown && mbx->ops.check_for_ack(hw)) {
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countdown--;
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udelay(mbx->usec_delay);
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}
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/* if we failed, all future posted messages fail until reset */
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if (!countdown)
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mbx->timeout = 0;
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out:
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return countdown ? E1000_SUCCESS : -E1000_ERR_MBX;
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}
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/**
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* e1000_read_posted_mbx - Wait for message notification and receive message
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* @hw: pointer to the HW structure
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* @msg: The message buffer
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* @size: Length of buffer
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*
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* returns SUCCESS if it successfully received a message notification and
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* copied it into the receive buffer.
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**/
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static s32 e1000_read_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size)
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{
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struct e1000_mbx_info *mbx = &hw->mbx;
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s32 ret_val = -E1000_ERR_MBX;
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if (!mbx->ops.read)
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goto out;
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ret_val = e1000_poll_for_msg(hw);
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/* if ack received read message, otherwise we timed out */
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if (!ret_val)
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ret_val = mbx->ops.read(hw, msg, size);
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out:
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return ret_val;
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}
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/**
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* e1000_write_posted_mbx - Write a message to the mailbox, wait for ack
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* @hw: pointer to the HW structure
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* @msg: The message buffer
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* @size: Length of buffer
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*
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* returns SUCCESS if it successfully copied message into the buffer and
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* received an ack to that message within delay * timeout period
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**/
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static s32 e1000_write_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size)
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{
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struct e1000_mbx_info *mbx = &hw->mbx;
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s32 ret_val = -E1000_ERR_MBX;
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/* exit if we either can't write or there isn't a defined timeout */
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if (!mbx->ops.write || !mbx->timeout)
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goto out;
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/* send msg*/
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ret_val = mbx->ops.write(hw, msg, size);
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/* if msg sent wait until we receive an ack */
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if (!ret_val)
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ret_val = e1000_poll_for_ack(hw);
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out:
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return ret_val;
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}
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/**
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* e1000_read_v2p_mailbox - read v2p mailbox
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* @hw: pointer to the HW structure
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*
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* This function is used to read the v2p mailbox without losing the read to
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* clear status bits.
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**/
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static u32 e1000_read_v2p_mailbox(struct e1000_hw *hw)
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{
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u32 v2p_mailbox = er32(V2PMAILBOX(0));
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v2p_mailbox |= hw->dev_spec.vf.v2p_mailbox;
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hw->dev_spec.vf.v2p_mailbox |= v2p_mailbox & E1000_V2PMAILBOX_R2C_BITS;
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return v2p_mailbox;
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}
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/**
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* e1000_check_for_bit_vf - Determine if a status bit was set
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* @hw: pointer to the HW structure
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* @mask: bitmask for bits to be tested and cleared
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*
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* This function is used to check for the read to clear bits within
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* the V2P mailbox.
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**/
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static s32 e1000_check_for_bit_vf(struct e1000_hw *hw, u32 mask)
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{
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u32 v2p_mailbox = e1000_read_v2p_mailbox(hw);
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s32 ret_val = -E1000_ERR_MBX;
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if (v2p_mailbox & mask)
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ret_val = E1000_SUCCESS;
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hw->dev_spec.vf.v2p_mailbox &= ~mask;
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return ret_val;
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}
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/**
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* e1000_check_for_msg_vf - checks to see if the PF has sent mail
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* @hw: pointer to the HW structure
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*
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* returns SUCCESS if the PF has set the Status bit or else ERR_MBX
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**/
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static s32 e1000_check_for_msg_vf(struct e1000_hw *hw)
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{
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s32 ret_val = -E1000_ERR_MBX;
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if (!e1000_check_for_bit_vf(hw, E1000_V2PMAILBOX_PFSTS)) {
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ret_val = E1000_SUCCESS;
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hw->mbx.stats.reqs++;
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}
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return ret_val;
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}
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/**
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* e1000_check_for_ack_vf - checks to see if the PF has ACK'd
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* @hw: pointer to the HW structure
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*
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* returns SUCCESS if the PF has set the ACK bit or else ERR_MBX
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**/
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static s32 e1000_check_for_ack_vf(struct e1000_hw *hw)
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{
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s32 ret_val = -E1000_ERR_MBX;
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if (!e1000_check_for_bit_vf(hw, E1000_V2PMAILBOX_PFACK)) {
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ret_val = E1000_SUCCESS;
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hw->mbx.stats.acks++;
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}
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return ret_val;
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}
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/**
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* e1000_check_for_rst_vf - checks to see if the PF has reset
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* @hw: pointer to the HW structure
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*
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* returns true if the PF has set the reset done bit or else false
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**/
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static s32 e1000_check_for_rst_vf(struct e1000_hw *hw)
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{
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s32 ret_val = -E1000_ERR_MBX;
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if (!e1000_check_for_bit_vf(hw, (E1000_V2PMAILBOX_RSTD |
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E1000_V2PMAILBOX_RSTI))) {
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ret_val = E1000_SUCCESS;
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hw->mbx.stats.rsts++;
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}
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return ret_val;
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}
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/**
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* e1000_obtain_mbx_lock_vf - obtain mailbox lock
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* @hw: pointer to the HW structure
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*
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* return SUCCESS if we obtained the mailbox lock
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**/
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static s32 e1000_obtain_mbx_lock_vf(struct e1000_hw *hw)
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{
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s32 ret_val = -E1000_ERR_MBX;
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int count = 10;
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do {
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/* Take ownership of the buffer */
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ew32(V2PMAILBOX(0), E1000_V2PMAILBOX_VFU);
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/* reserve mailbox for VF use */
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if (e1000_read_v2p_mailbox(hw) & E1000_V2PMAILBOX_VFU) {
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ret_val = 0;
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break;
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}
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udelay(1000);
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} while (count-- > 0);
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return ret_val;
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}
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/**
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* e1000_write_mbx_vf - Write a message to the mailbox
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* @hw: pointer to the HW structure
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* @msg: The message buffer
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* @size: Length of buffer
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*
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* returns SUCCESS if it successfully copied message into the buffer
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**/
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static s32 e1000_write_mbx_vf(struct e1000_hw *hw, u32 *msg, u16 size)
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{
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s32 err;
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u16 i;
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/* lock the mailbox to prevent pf/vf race condition */
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err = e1000_obtain_mbx_lock_vf(hw);
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if (err)
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goto out_no_write;
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/* flush any ack or msg as we are going to overwrite mailbox */
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e1000_check_for_ack_vf(hw);
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e1000_check_for_msg_vf(hw);
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/* copy the caller specified message to the mailbox memory buffer */
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for (i = 0; i < size; i++)
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array_ew32(VMBMEM(0), i, msg[i]);
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/* update stats */
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hw->mbx.stats.msgs_tx++;
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/* Drop VFU and interrupt the PF to tell it a message has been sent */
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ew32(V2PMAILBOX(0), E1000_V2PMAILBOX_REQ);
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out_no_write:
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return err;
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}
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/**
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* e1000_read_mbx_vf - Reads a message from the inbox intended for VF
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* @hw: pointer to the HW structure
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* @msg: The message buffer
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* @size: Length of buffer
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*
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* returns SUCCESS if it successfully read message from buffer
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**/
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static s32 e1000_read_mbx_vf(struct e1000_hw *hw, u32 *msg, u16 size)
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{
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s32 err;
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u16 i;
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/* lock the mailbox to prevent pf/vf race condition */
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err = e1000_obtain_mbx_lock_vf(hw);
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if (err)
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goto out_no_read;
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/* copy the message from the mailbox memory buffer */
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for (i = 0; i < size; i++)
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msg[i] = array_er32(VMBMEM(0), i);
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/* Acknowledge receipt and release mailbox, then we're done */
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ew32(V2PMAILBOX(0), E1000_V2PMAILBOX_ACK);
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/* update stats */
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hw->mbx.stats.msgs_rx++;
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out_no_read:
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return err;
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}
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/**
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* e1000_init_mbx_params_vf - set initial values for VF mailbox
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* @hw: pointer to the HW structure
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*
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* Initializes the hw->mbx struct to correct values for VF mailbox
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*/
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s32 e1000_init_mbx_params_vf(struct e1000_hw *hw)
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{
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struct e1000_mbx_info *mbx = &hw->mbx;
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/* start mailbox as timed out and let the reset_hw call set the timeout
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* value to being communications
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*/
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mbx->timeout = 0;
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mbx->usec_delay = E1000_VF_MBX_INIT_DELAY;
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mbx->size = E1000_VFMAILBOX_SIZE;
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mbx->ops.read = e1000_read_mbx_vf;
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mbx->ops.write = e1000_write_mbx_vf;
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mbx->ops.read_posted = e1000_read_posted_mbx;
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mbx->ops.write_posted = e1000_write_posted_mbx;
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mbx->ops.check_for_msg = e1000_check_for_msg_vf;
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mbx->ops.check_for_ack = e1000_check_for_ack_vf;
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mbx->ops.check_for_rst = e1000_check_for_rst_vf;
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mbx->stats.msgs_tx = 0;
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mbx->stats.msgs_rx = 0;
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mbx->stats.reqs = 0;
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mbx->stats.acks = 0;
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mbx->stats.rsts = 0;
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return E1000_SUCCESS;
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}
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