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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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7bdf72d3d8
Introduce mei_data2slots wrapper for sake of readability. This wrapper close up the open code for computing slots from a message length: rond up dwords count from payload and header byte size Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
408 lines
10 KiB
C
408 lines
10 KiB
C
/*
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*
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* Intel Management Engine Interface (Intel MEI) Linux driver
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* Copyright (c) 2003-2012, Intel Corporation.
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*
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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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*
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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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*
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*/
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#include <linux/pci.h>
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#include "mei_dev.h"
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#include <linux/mei.h>
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#include "interface.h"
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/**
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* mei_set_csr_register - writes H_CSR register to the mei device,
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* and ignores the H_IS bit for it is write-one-to-zero.
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*
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* @dev: the device structure
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*/
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void mei_hcsr_set(struct mei_device *dev)
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{
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if ((dev->host_hw_state & H_IS) == H_IS)
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dev->host_hw_state &= ~H_IS;
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mei_reg_write(dev, H_CSR, dev->host_hw_state);
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dev->host_hw_state = mei_hcsr_read(dev);
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}
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/**
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* mei_csr_enable_interrupts - enables mei device interrupts
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*
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* @dev: the device structure
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*/
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void mei_enable_interrupts(struct mei_device *dev)
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{
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dev->host_hw_state |= H_IE;
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mei_hcsr_set(dev);
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}
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/**
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* mei_csr_disable_interrupts - disables mei device interrupts
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*
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* @dev: the device structure
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*/
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void mei_disable_interrupts(struct mei_device *dev)
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{
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dev->host_hw_state &= ~H_IE;
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mei_hcsr_set(dev);
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}
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/**
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* mei_hbuf_filled_slots - gets number of device filled buffer slots
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*
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* @device: the device structure
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*
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* returns number of filled slots
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*/
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static unsigned char mei_hbuf_filled_slots(struct mei_device *dev)
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{
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char read_ptr, write_ptr;
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dev->host_hw_state = mei_hcsr_read(dev);
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read_ptr = (char) ((dev->host_hw_state & H_CBRP) >> 8);
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write_ptr = (char) ((dev->host_hw_state & H_CBWP) >> 16);
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return (unsigned char) (write_ptr - read_ptr);
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}
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/**
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* mei_hbuf_is_empty - checks if host buffer is empty.
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*
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* @dev: the device structure
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*
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* returns true if empty, false - otherwise.
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*/
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bool mei_hbuf_is_empty(struct mei_device *dev)
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{
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return mei_hbuf_filled_slots(dev) == 0;
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}
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/**
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* mei_hbuf_empty_slots - counts write empty slots.
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*
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* @dev: the device structure
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*
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* returns -1(ESLOTS_OVERFLOW) if overflow, otherwise empty slots count
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*/
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int mei_hbuf_empty_slots(struct mei_device *dev)
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{
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unsigned char filled_slots, empty_slots;
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filled_slots = mei_hbuf_filled_slots(dev);
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empty_slots = dev->hbuf_depth - filled_slots;
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/* check for overflow */
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if (filled_slots > dev->hbuf_depth)
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return -EOVERFLOW;
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return empty_slots;
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}
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/**
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* mei_write_message - writes a message to mei device.
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*
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* @dev: the device structure
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* @header: header of message
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* @write_buffer: message buffer will be written
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* @write_length: message size will be written
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*
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* This function returns -EIO if write has failed
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*/
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int mei_write_message(struct mei_device *dev, struct mei_msg_hdr *header,
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unsigned char *buf, unsigned long length)
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{
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unsigned long rem, dw_cnt;
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u32 *reg_buf = (u32 *)buf;
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int i;
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int empty_slots;
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dev_dbg(&dev->pdev->dev,
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"mei_write_message header=%08x.\n",
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*((u32 *) header));
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empty_slots = mei_hbuf_empty_slots(dev);
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dev_dbg(&dev->pdev->dev, "empty slots = %hu.\n", empty_slots);
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dw_cnt = mei_data2slots(length);
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if (empty_slots < 0 || dw_cnt > empty_slots)
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return -EIO;
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mei_reg_write(dev, H_CB_WW, *((u32 *) header));
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for (i = 0; i < length / 4; i++)
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mei_reg_write(dev, H_CB_WW, reg_buf[i]);
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rem = length & 0x3;
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if (rem > 0) {
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u32 reg = 0;
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memcpy(®, &buf[length - rem], rem);
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mei_reg_write(dev, H_CB_WW, reg);
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}
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dev->host_hw_state = mei_hcsr_read(dev);
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dev->host_hw_state |= H_IG;
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mei_hcsr_set(dev);
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dev->me_hw_state = mei_mecsr_read(dev);
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if ((dev->me_hw_state & ME_RDY_HRA) != ME_RDY_HRA)
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return -EIO;
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return 0;
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}
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/**
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* mei_count_full_read_slots - counts read full slots.
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*
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* @dev: the device structure
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*
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* returns -1(ESLOTS_OVERFLOW) if overflow, otherwise filled slots count
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*/
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int mei_count_full_read_slots(struct mei_device *dev)
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{
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char read_ptr, write_ptr;
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unsigned char buffer_depth, filled_slots;
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dev->me_hw_state = mei_mecsr_read(dev);
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buffer_depth = (unsigned char)((dev->me_hw_state & ME_CBD_HRA) >> 24);
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read_ptr = (char) ((dev->me_hw_state & ME_CBRP_HRA) >> 8);
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write_ptr = (char) ((dev->me_hw_state & ME_CBWP_HRA) >> 16);
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filled_slots = (unsigned char) (write_ptr - read_ptr);
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/* check for overflow */
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if (filled_slots > buffer_depth)
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return -EOVERFLOW;
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dev_dbg(&dev->pdev->dev, "filled_slots =%08x\n", filled_slots);
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return (int)filled_slots;
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}
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/**
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* mei_read_slots - reads a message from mei device.
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*
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* @dev: the device structure
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* @buffer: message buffer will be written
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* @buffer_length: message size will be read
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*/
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void mei_read_slots(struct mei_device *dev, unsigned char *buffer,
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unsigned long buffer_length)
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{
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u32 *reg_buf = (u32 *)buffer;
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for (; buffer_length >= sizeof(u32); buffer_length -= sizeof(u32))
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*reg_buf++ = mei_mecbrw_read(dev);
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if (buffer_length > 0) {
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u32 reg = mei_mecbrw_read(dev);
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memcpy(reg_buf, ®, buffer_length);
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}
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dev->host_hw_state |= H_IG;
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mei_hcsr_set(dev);
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}
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/**
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* mei_flow_ctrl_creds - checks flow_control credentials.
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*
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* @dev: the device structure
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* @cl: private data of the file object
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*
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* returns 1 if mei_flow_ctrl_creds >0, 0 - otherwise.
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* -ENOENT if mei_cl is not present
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* -EINVAL if single_recv_buf == 0
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*/
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int mei_flow_ctrl_creds(struct mei_device *dev, struct mei_cl *cl)
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{
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int i;
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if (!dev->me_clients_num)
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return 0;
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if (cl->mei_flow_ctrl_creds > 0)
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return 1;
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for (i = 0; i < dev->me_clients_num; i++) {
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struct mei_me_client *me_cl = &dev->me_clients[i];
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if (me_cl->client_id == cl->me_client_id) {
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if (me_cl->mei_flow_ctrl_creds) {
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if (WARN_ON(me_cl->props.single_recv_buf == 0))
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return -EINVAL;
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return 1;
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} else {
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return 0;
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}
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}
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}
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return -ENOENT;
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}
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/**
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* mei_flow_ctrl_reduce - reduces flow_control.
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*
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* @dev: the device structure
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* @cl: private data of the file object
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* @returns
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* 0 on success
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* -ENOENT when me client is not found
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* -EINVAL when ctrl credits are <= 0
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*/
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int mei_flow_ctrl_reduce(struct mei_device *dev, struct mei_cl *cl)
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{
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int i;
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if (!dev->me_clients_num)
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return -ENOENT;
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for (i = 0; i < dev->me_clients_num; i++) {
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struct mei_me_client *me_cl = &dev->me_clients[i];
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if (me_cl->client_id == cl->me_client_id) {
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if (me_cl->props.single_recv_buf != 0) {
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if (WARN_ON(me_cl->mei_flow_ctrl_creds <= 0))
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return -EINVAL;
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dev->me_clients[i].mei_flow_ctrl_creds--;
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} else {
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if (WARN_ON(cl->mei_flow_ctrl_creds <= 0))
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return -EINVAL;
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cl->mei_flow_ctrl_creds--;
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}
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return 0;
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}
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}
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return -ENOENT;
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}
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/**
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* mei_send_flow_control - sends flow control to fw.
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*
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* @dev: the device structure
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* @cl: private data of the file object
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*
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* This function returns -EIO on write failure
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*/
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int mei_send_flow_control(struct mei_device *dev, struct mei_cl *cl)
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{
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struct mei_msg_hdr *mei_hdr;
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struct hbm_flow_control *mei_flow_control;
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mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
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mei_hdr->host_addr = 0;
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mei_hdr->me_addr = 0;
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mei_hdr->length = sizeof(struct hbm_flow_control);
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mei_hdr->msg_complete = 1;
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mei_hdr->reserved = 0;
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mei_flow_control = (struct hbm_flow_control *) &dev->wr_msg_buf[1];
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memset(mei_flow_control, 0, sizeof(*mei_flow_control));
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mei_flow_control->host_addr = cl->host_client_id;
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mei_flow_control->me_addr = cl->me_client_id;
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mei_flow_control->hbm_cmd = MEI_FLOW_CONTROL_CMD;
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memset(mei_flow_control->reserved, 0,
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sizeof(mei_flow_control->reserved));
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dev_dbg(&dev->pdev->dev, "sending flow control host client = %d, ME client = %d\n",
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cl->host_client_id, cl->me_client_id);
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return mei_write_message(dev, mei_hdr,
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(unsigned char *) mei_flow_control,
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sizeof(struct hbm_flow_control));
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}
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/**
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* mei_other_client_is_connecting - checks if other
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* client with the same client id is connected.
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*
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* @dev: the device structure
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* @cl: private data of the file object
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*
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* returns 1 if other client is connected, 0 - otherwise.
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*/
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int mei_other_client_is_connecting(struct mei_device *dev,
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struct mei_cl *cl)
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{
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struct mei_cl *cl_pos = NULL;
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struct mei_cl *cl_next = NULL;
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list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) {
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if ((cl_pos->state == MEI_FILE_CONNECTING) &&
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(cl_pos != cl) &&
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cl->me_client_id == cl_pos->me_client_id)
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return 1;
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}
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return 0;
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}
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/**
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* mei_disconnect - sends disconnect message to fw.
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*
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* @dev: the device structure
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* @cl: private data of the file object
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*
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* This function returns -EIO on write failure
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*/
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int mei_disconnect(struct mei_device *dev, struct mei_cl *cl)
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{
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struct mei_msg_hdr *mei_hdr;
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struct hbm_client_disconnect_request *mei_cli_disconnect;
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mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
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mei_hdr->host_addr = 0;
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mei_hdr->me_addr = 0;
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mei_hdr->length = sizeof(struct hbm_client_disconnect_request);
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mei_hdr->msg_complete = 1;
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mei_hdr->reserved = 0;
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mei_cli_disconnect =
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(struct hbm_client_disconnect_request *) &dev->wr_msg_buf[1];
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memset(mei_cli_disconnect, 0, sizeof(*mei_cli_disconnect));
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mei_cli_disconnect->host_addr = cl->host_client_id;
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mei_cli_disconnect->me_addr = cl->me_client_id;
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mei_cli_disconnect->hbm_cmd = CLIENT_DISCONNECT_REQ_CMD;
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mei_cli_disconnect->reserved[0] = 0;
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return mei_write_message(dev, mei_hdr,
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(unsigned char *) mei_cli_disconnect,
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sizeof(struct hbm_client_disconnect_request));
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}
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/**
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* mei_connect - sends connect message to fw.
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*
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* @dev: the device structure
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* @cl: private data of the file object
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*
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* This function returns -EIO on write failure
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*/
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int mei_connect(struct mei_device *dev, struct mei_cl *cl)
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{
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struct mei_msg_hdr *mei_hdr;
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struct hbm_client_connect_request *mei_cli_connect;
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mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
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mei_hdr->host_addr = 0;
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mei_hdr->me_addr = 0;
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mei_hdr->length = sizeof(struct hbm_client_connect_request);
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mei_hdr->msg_complete = 1;
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mei_hdr->reserved = 0;
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mei_cli_connect =
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(struct hbm_client_connect_request *) &dev->wr_msg_buf[1];
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mei_cli_connect->host_addr = cl->host_client_id;
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mei_cli_connect->me_addr = cl->me_client_id;
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mei_cli_connect->hbm_cmd = CLIENT_CONNECT_REQ_CMD;
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mei_cli_connect->reserved = 0;
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return mei_write_message(dev, mei_hdr,
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(unsigned char *) mei_cli_connect,
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sizeof(struct hbm_client_connect_request));
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}
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