path: root/drivers/misc/mei/bus-fixup.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2013-2023, Intel Corporation. All rights reserved.
 * Intel Management Engine Interface (Intel MEI) Linux driver
 */

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/slab.h>

#include <linux/mei.h>
#include <linux/mei_cl_bus.h>

#include "mei_dev.h"
#include "client.h"
#include "mkhi.h"

#define MEI_UUID_NFC_INFO UUID_LE(0xd2de1625, 0x382d, 0x417d, \
			0x48, 0xa4, 0xef, 0xab, 0xba, 0x8a, 0x12, 0x06)

static const uuid_le mei_nfc_info_guid = MEI_UUID_NFC_INFO;

#define MEI_UUID_NFC_HCI UUID_LE(0x0bb17a78, 0x2a8e, 0x4c50, \
			0x94, 0xd4, 0x50, 0x26, 0x67, 0x23, 0x77, 0x5c)

#define MEI_UUID_WD UUID_LE(0x05B79A6F, 0x4628, 0x4D7F, \
			    0x89, 0x9D, 0xA9, 0x15, 0x14, 0xCB, 0x32, 0xAB)

#define MEI_UUID_MKHIF_FIX UUID_LE(0x55213584, 0x9a29, 0x4916, \
			0xba, 0xdf, 0xf, 0xb7, 0xed, 0x68, 0x2a, 0xeb)

#define MEI_UUID_IGSC_MKHI UUID_LE(0xE2C2AFA2, 0x3817, 0x4D19, \
			0x9D, 0x95, 0x06, 0xB1, 0x6B, 0x58, 0x8A, 0x5D)

#define MEI_UUID_IGSC_MKHI_FIX UUID_LE(0x46E0C1FB, 0xA546, 0x414F, \
			0x91, 0x70, 0xB7, 0xF4, 0x6D, 0x57, 0xB4, 0xAD)

#define MEI_UUID_HDCP UUID_LE(0xB638AB7E, 0x94E2, 0x4EA2, \
			      0xA5, 0x52, 0xD1, 0xC5, 0x4B, 0x62, 0x7F, 0x04)

#define MEI_UUID_PAVP UUID_LE(0xfbf6fcf1, 0x96cf, 0x4e2e, 0xA6, \
			      0xa6, 0x1b, 0xab, 0x8c, 0xbe, 0x36, 0xb1)

#define MEI_UUID_ANY NULL_UUID_LE

/**
 * number_of_connections - determine whether an client be on the bus
 *    according number of connections
 *    We support only clients:
 *       1. with single connection
 *       2. and fixed clients (max_number_of_connections == 0)
 *
 * @cldev: me clients device
 */
static void number_of_connections(struct mei_cl_device *cldev)
{
	if (cldev->me_cl->props.max_number_of_connections > 1)
		cldev->do_match = 0;
}

/**
 * blacklist - blacklist a client from the bus
 *
 * @cldev: me clients device
 */
static void blacklist(struct mei_cl_device *cldev)
{
	cldev->do_match = 0;
}

/**
 * whitelist - forcefully whitelist client
 *
 * @cldev: me clients device
 */
static void whitelist(struct mei_cl_device *cldev)
{
	cldev->do_match = 1;
}

#define MKHI_SEND_MAX_TIMEOUT_MSEC 4000

#define OSTYPE_LINUX    2
struct mei_os_ver {
	__le16 build;
	__le16 reserved1;
	u8  os_type;
	u8  major;
	u8  minor;
	u8  reserved2;
} __packed;

struct mkhi_fw_ver_block {
	u16 minor;
	u8 major;
	u8 platform;
	u16 buildno;
	u16 hotfix;
} __packed;

struct mkhi_fw_ver {
	struct mkhi_fw_ver_block ver[MEI_MAX_FW_VER_BLOCKS];
} __packed;

#define MKHI_OSVER_BUF_LEN (sizeof(struct mkhi_msg_hdr) + \
			    sizeof(struct mkhi_fwcaps) + \
			    sizeof(struct mei_os_ver))
static int mei_osver(struct mei_cl_device *cldev)
{
	const size_t size = MKHI_OSVER_BUF_LEN;
	u8 buf[MKHI_OSVER_BUF_LEN];
	struct mkhi_msg *req;
	struct mkhi_fwcaps *fwcaps;
	struct mei_os_ver *os_ver;
	unsigned int mode = MEI_CL_IO_TX_BLOCKING | MEI_CL_IO_TX_INTERNAL;

	memset(buf, 0, size);

	req = (struct mkhi_msg *)buf;
	req->hdr.group_id = MKHI_FWCAPS_GROUP_ID;
	req->hdr.command = MKHI_FWCAPS_SET_OS_VER_APP_RULE_CMD;

	fwcaps = (struct mkhi_fwcaps *)req->data;

	fwcaps->id.rule_type = 0x0;
	fwcaps->id.feature_id = MKHI_FEATURE_PTT;
	fwcaps->len = sizeof(*os_ver);
	os_ver = (struct mei_os_ver *)fwcaps->data;
	os_ver->os_type = OSTYPE_LINUX;

	return __mei_cl_send_timeout(cldev->cl, buf, size, 0, mode, MKHI_SEND_MAX_TIMEOUT_MSEC);
}

#define MKHI_FWVER_BUF_LEN (sizeof(struct mkhi_msg_hdr) + \
			    sizeof(struct mkhi_fw_ver))
#define MKHI_FWVER_LEN(__num) (sizeof(struct mkhi_msg_hdr) + \
			       sizeof(struct mkhi_fw_ver_block) * (__num))
static int mei_fwver(struct mei_cl_device *cldev)
{
	u8 buf[MKHI_FWVER_BUF_LEN];
	struct mkhi_msg req;
	struct mkhi_msg *rsp;
	struct mkhi_fw_ver *fwver;
	int bytes_recv, ret, i;

	memset(buf, 0, sizeof(buf));

	req.hdr.group_id = MKHI_GEN_GROUP_ID;
	req.hdr.command = MKHI_GEN_GET_FW_VERSION_CMD;

	ret = __mei_cl_send_timeout(cldev->cl, (u8 *)&req, sizeof(req), 0,
				    MEI_CL_IO_TX_BLOCKING, MKHI_SEND_MAX_TIMEOUT_MSEC);
	if (ret < 0) {
		dev_info(&cldev->dev, "Could not send ReqFWVersion cmd ret = %d\n", ret);
		return ret;
	}

	ret = 0;
	bytes_recv = __mei_cl_recv(cldev->cl, buf, sizeof(buf), NULL, 0,
				   cldev->bus->timeouts.mkhi_recv);
	if (bytes_recv < 0 || (size_t)bytes_recv < MKHI_FWVER_LEN(1)) {
		/*
		 * Should be at least one version block,
		 * error out if nothing found
		 */
		dev_info(&cldev->dev, "Could not read FW version ret = %d\n", bytes_recv);
		return -EIO;
	}

	rsp = (struct mkhi_msg *)buf;
	fwver = (struct mkhi_fw_ver *)rsp->data;
	memset(cldev->bus->fw_ver, 0, sizeof(cldev->bus->fw_ver));
	for (i = 0; i < MEI_MAX_FW_VER_BLOCKS; i++) {
		if ((size_t)bytes_recv < MKHI_FWVER_LEN(i + 1))
			break;
		dev_dbg(&cldev->dev, "FW version%d %d:%d.%d.%d.%d\n",
			i, fwver->ver[i].platform,
			fwver->ver[i].major, fwver->ver[i].minor,
			fwver->ver[i].hotfix, fwver->ver[i].buildno);

		cldev->bus->fw_ver[i].platform = fwver->ver[i].platform;
		cldev->bus->fw_ver[i].major = fwver->ver[i].major;
		cldev->bus->fw_ver[i].minor = fwver->ver[i].minor;
		cldev->bus->fw_ver[i].hotfix = fwver->ver[i].hotfix;
		cldev->bus->fw_ver[i].buildno = fwver->ver[i].buildno;
	}
	cldev->bus->fw_ver_received = 1;

	return ret;
}

#define GFX_MEMORY_READY_TIMEOUT 200 /* timeout in milliseconds */

static int mei_gfx_memory_ready(struct mei_cl_device *cldev)
{
	struct mkhi_gfx_mem_ready req = {0};
	unsigned int mode = MEI_CL_IO_TX_INTERNAL | MEI_CL_IO_TX_BLOCKING;

	req.hdr.group_id = MKHI_GROUP_ID_GFX;
	req.hdr.command = MKHI_GFX_MEMORY_READY_CMD_REQ;
	req.flags = MKHI_GFX_MEM_READY_PXP_ALLOWED;

	dev_dbg(&cldev->dev, "Sending memory ready command\n");
	return __mei_cl_send_timeout(cldev->cl, (u8 *)&req, sizeof(req), 0,
				     mode, GFX_MEMORY_READY_TIMEOUT);
}

static void mei_mkhi_fix(struct mei_cl_device *cldev)
{
	int ret;

	/* No need to enable the client if nothing is needed from it */
	if (!cldev->bus->fw_f_fw_ver_supported &&
	    !cldev->bus->hbm_f_os_supported)
		return;

	ret = mei_cldev_enable(cldev);
	if (ret)
		return;

	if (cldev->bus->fw_f_fw_ver_supported) {
		ret = mei_fwver(cldev);
		if (ret < 0)
			dev_info(&cldev->dev, "FW version command failed %d\n",
				 ret);
	}

	if (cldev->bus->hbm_f_os_supported) {
		ret = mei_osver(cldev);
		if (ret < 0)
			dev_info(&cldev->dev, "OS version command failed %d\n",
				 ret);
	}
	mei_cldev_disable(cldev);
}

static void mei_gsc_mkhi_ver(struct mei_cl_device *cldev)
{
	int ret;

	/*
	 * No need to enable the client if nothing is needed from it.
	 * No need to fill in version if it is already filled in by the fix address client.
	 */
	if (!cldev->bus->fw_f_fw_ver_supported || cldev->bus->fw_ver_received)
		return;

	ret = mei_cldev_enable(cldev);
	if (ret)
		return;

	ret = mei_fwver(cldev);
	if (ret < 0)
		dev_info(&cldev->dev, "FW version command failed %d\n", ret);
	mei_cldev_disable(cldev);
}

static void mei_gsc_mkhi_fix_ver(struct mei_cl_device *cldev)
{
	int ret;

	/* No need to enable the client if nothing is needed from it */
	if (!cldev->bus->fw_f_fw_ver_supported &&
	    cldev->bus->pxp_mode != MEI_DEV_PXP_INIT)
		return;

	ret = mei_cldev_enable(cldev);
	if (ret)
		return;

	if (cldev->bus->pxp_mode == MEI_DEV_PXP_INIT) {
		ret = mei_gfx_memory_ready(cldev);
		if (ret < 0) {
			dev_err(&cldev->dev, "memory ready command failed %d\n", ret);
		} else {
			dev_dbg(&cldev->dev, "memory ready command sent\n");
			cldev->bus->pxp_mode = MEI_DEV_PXP_SETUP;
		}
		/* we go to reset after that */
		goto out;
	}

	ret = mei_fwver(cldev);
	if (ret < 0)
		dev_info(&cldev->dev, "FW version command failed %d\n",
			 ret);
out:
	mei_cldev_disable(cldev);
}

/**
 * mei_wd - wd client on the bus, change protocol version
 *   as the API has changed.
 *
 * @cldev: me clients device
 */
#if IS_ENABLED(CONFIG_INTEL_MEI_ME)
#include <linux/pci.h>
#include "hw-me-regs.h"
static void mei_wd(struct mei_cl_device *cldev)
{
	struct pci_dev *pdev = to_pci_dev(cldev->dev.parent);

	if (pdev->device == MEI_DEV_ID_WPT_LP ||
	    pdev->device