linux/drivers/acpi/pfr_update.c

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// SPDX-License-Identifier: GPL-2.0
/*
* ACPI Platform Firmware Runtime Update Device driver
*
* Copyright (C) 2021 Intel Corporation
* Author: Chen Yu <yu.c.chen@intel.com>
*
* pfr_update driver is used for Platform Firmware Runtime
* Update, which includes the code injection and driver update.
*/
#include <linux/acpi.h>
#include <linux/device.h>
#include <linux/efi.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/idr.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/string.h>
#include <linux/uaccess.h>
#include <linux/uio.h>
#include <linux/uuid.h>
#include <uapi/linux/pfrut.h>
#define PFRU_FUNC_STANDARD_QUERY 0
#define PFRU_FUNC_QUERY_UPDATE_CAP 1
#define PFRU_FUNC_QUERY_BUF 2
#define PFRU_FUNC_START 3
#define PFRU_CODE_INJECT_TYPE 1
#define PFRU_DRIVER_UPDATE_TYPE 2
#define PFRU_REVID_1 1
#define PFRU_REVID_2 2
#define PFRU_DEFAULT_REV_ID PFRU_REVID_1
enum cap_index {
CAP_STATUS_IDX = 0,
CAP_UPDATE_IDX = 1,
CAP_CODE_TYPE_IDX = 2,
CAP_FW_VER_IDX = 3,
CAP_CODE_RT_VER_IDX = 4,
CAP_DRV_TYPE_IDX = 5,
CAP_DRV_RT_VER_IDX = 6,
CAP_DRV_SVN_IDX = 7,
CAP_PLAT_ID_IDX = 8,
CAP_OEM_ID_IDX = 9,
CAP_OEM_INFO_IDX = 10,
CAP_NR_IDX
};
enum buf_index {
BUF_STATUS_IDX = 0,
BUF_EXT_STATUS_IDX = 1,
BUF_ADDR_LOW_IDX = 2,
BUF_ADDR_HI_IDX = 3,
BUF_SIZE_IDX = 4,
BUF_NR_IDX
};
enum update_index {
UPDATE_STATUS_IDX = 0,
UPDATE_EXT_STATUS_IDX = 1,
UPDATE_AUTH_TIME_LOW_IDX = 2,
UPDATE_AUTH_TIME_HI_IDX = 3,
UPDATE_EXEC_TIME_LOW_IDX = 4,
UPDATE_EXEC_TIME_HI_IDX = 5,
UPDATE_NR_IDX
};
enum pfru_start_action {
START_STAGE = 0,
START_ACTIVATE = 1,
START_STAGE_ACTIVATE = 2,
};
struct pfru_device {
u32 rev_id, index;
struct device *parent_dev;
struct miscdevice miscdev;
};
static DEFINE_IDA(pfru_ida);
/*
* Manual reference:
* https://uefi.org/sites/default/files/resources/Intel_MM_OS_Interface_Spec_Rev100.pdf
*
* pfru_guid is the parameter for _DSM method
*/
static const guid_t pfru_guid =
GUID_INIT(0xECF9533B, 0x4A3C, 0x4E89, 0x93, 0x9E, 0xC7, 0x71,
0x12, 0x60, 0x1C, 0x6D);
/* pfru_code_inj_guid is the UUID to identify code injection EFI capsule file */
static const guid_t pfru_code_inj_guid =
GUID_INIT(0xB2F84B79, 0x7B6E, 0x4E45, 0x88, 0x5F, 0x3F, 0xB9,
0xBB, 0x18, 0x54, 0x02);
/* pfru_drv_update_guid is the UUID to identify driver update EFI capsule file */
static const guid_t pfru_drv_update_guid =
GUID_INIT(0x4569DD8C, 0x75F1, 0x429A, 0xA3, 0xD6, 0x24, 0xDE,
0x80, 0x97, 0xA0, 0xDF);
static inline int pfru_valid_revid(u32 id)
{
return id == PFRU_REVID_1 || id == PFRU_REVID_2;
}
static inline struct pfru_device *to_pfru_dev(struct file *file)
{
return container_of(file->private_data, struct pfru_device, miscdev);
}
static int query_capability(struct pfru_update_cap_info *cap_hdr,
struct pfru_device *pfru_dev)
{
acpi_handle handle = ACPI_HANDLE(pfru_dev->parent_dev);
union acpi_object *out_obj;
int ret = -EINVAL;
out_obj = acpi_evaluate_dsm_typed(handle, &pfru_guid,
pfru_dev->rev_id,
PFRU_FUNC_QUERY_UPDATE_CAP,
NULL, ACPI_TYPE_PACKAGE);
if (!out_obj)
return ret;
if (out_obj->package.count < CAP_NR_IDX ||
out_obj->package.elements[CAP_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
out_obj->package.elements[CAP_UPDATE_IDX].type != ACPI_TYPE_INTEGER ||
out_obj->package.elements[CAP_CODE_TYPE_IDX].type != ACPI_TYPE_BUFFER ||
out_obj->package.elements[CAP_FW_VER_IDX].type != ACPI_TYPE_INTEGER ||
out_obj->package.elements[CAP_CODE_RT_VER_IDX].type != ACPI_TYPE_INTEGER ||
out_obj->package.elements[CAP_DRV_TYPE_IDX].type != ACPI_TYPE_BUFFER ||
out_obj->package.elements[CAP_DRV_RT_VER_IDX].type != ACPI_TYPE_INTEGER ||
out_obj->package.elements[CAP_DRV_SVN_IDX].type != ACPI_TYPE_INTEGER ||
out_obj->package.elements[CAP_PLAT_ID_IDX].type != ACPI_TYPE_BUFFER ||
out_obj->package.elements[CAP_OEM_ID_IDX].type != ACPI_TYPE_BUFFER ||
out_obj->package.elements[CAP_OEM_INFO_IDX].type != ACPI_TYPE_BUFFER)
goto free_acpi_buffer;
cap_hdr->status = out_obj->package.elements[CAP_STATUS_IDX].integer.value;
if (cap_hdr->status != DSM_SUCCEED) {
ret = -EBUSY;
dev_dbg(pfru_dev->parent_dev, "Error Status:%d\n", cap_hdr->status);
goto free_acpi_buffer;
}
cap_hdr->update_cap = out_obj->package.elements[CAP_UPDATE_IDX].integer.value;
memcpy(&cap_hdr->code_type,
out_obj->package.elements[CAP_CODE_TYPE_IDX].buffer.pointer,
out_obj->package.elements[CAP_CODE_TYPE_IDX].buffer.length);
cap_hdr->fw_version =
out_obj->package.elements[CAP_FW_VER_IDX].integer.value;
cap_hdr->code_rt_version =
out_obj->package.elements[CAP_CODE_RT_VER_IDX].integer.value;
memcpy(&cap_hdr->drv_type,
out_obj->package.elements[CAP_DRV_TYPE_IDX].buffer.pointer,
out_obj->package.elements[CAP_DRV_TYPE_IDX].buffer.length);
cap_hdr->drv_rt_version =
out_obj->package.elements[CAP_DRV_RT_VER_IDX].integer.value;
cap_hdr->drv_svn =
out_obj->package.elements[CAP_DRV_SVN_IDX].integer.value;
memcpy(&cap_hdr->platform_id,
out_obj->package.elements[CAP_PLAT_ID_IDX].buffer.pointer,
out_obj->package.elements[CAP_PLAT_ID_IDX].buffer.length);
memcpy(&cap_hdr->oem_id,
out_obj->package.elements[CAP_OEM_ID_IDX].buffer.pointer,
out_obj->package.elements[CAP_OEM_ID_IDX].buffer.length);
cap_hdr->oem_info_len =
out_obj->package.elements[CAP_OEM_INFO_IDX].buffer.length;
ret = 0;
free_acpi_buffer:
ACPI_FREE(out_obj);
return ret;
}
static int query_buffer(struct pfru_com_buf_info *info,
struct pfru_device *pfru_dev)
{
acpi_handle handle = ACPI_HANDLE(pfru_dev->parent_dev);
union acpi_object *out_obj;
int ret = -EINVAL;
out_obj = acpi_evaluate_dsm_typed(handle, &pfru_guid,
pfru_dev->rev_id, PFRU_FUNC_QUERY_BUF,
NULL, ACPI_TYPE_PACKAGE);
if (!out_obj)
return ret;
if (out_obj->package.count < BUF_NR_IDX ||
out_obj->package.elements[BUF_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
out_obj->package.elements[BUF_EXT_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
out_obj->package.elements[BUF_ADDR_LOW_IDX].type != ACPI_TYPE_INTEGER ||
out_obj->package.elements[BUF_ADDR_HI_IDX].type != ACPI_TYPE_INTEGER ||
out_obj->package.elements[BUF_SIZE_IDX].type != ACPI_TYPE_INTEGER)
goto free_acpi_buffer;
info->status = out_obj->package.elements[BUF_STATUS_IDX].integer.value;
info->ext_status =
out_obj->package.elements[BUF_EXT_STATUS_IDX].integer.value;
if (info->status != DSM_SUCCEED) {
ret = -EBUSY;
dev_dbg(pfru_dev->parent_dev, "Error Status:%d\n", info->status);
dev_dbg(pfru_dev->parent_dev, "Error Extended Status:%d\n", info->ext_status);
goto free_acpi_buffer;
}
info->addr_lo =
out_obj->package.elements[BUF_ADDR_LOW_IDX].integer.value;
info->addr_hi =
out_obj->package.elements[BUF_ADDR_HI_IDX].integer.value;
info->buf_size = out_obj->package.elements[BUF_SIZE_IDX].integer.value;
ret = 0;
free_acpi_buffer:
ACPI_FREE(out_obj);
return ret;
}
static int get_image_type(const struct efi_manage_capsule_image_header *img_hdr,
struct pfru_device *pfru_dev)
{
const efi_guid_t *image_type_id = &img_hdr->image_type_id;
/* check whether this is a code injection or driver update */
if (guid_equal(image_type_id, &pfru_code_inj_guid))
return PFRU_CODE_INJECT_TYPE;
if (guid_equal(image_type_id, &pfru_drv_update_guid))
return PFRU_DRIVER_UPDATE_TYPE;
return -EINVAL;
}
static int adjust_efi_size(const struct efi_manage_capsule_image_header *img_hdr,
int size)
{
/*
* The (u64 hw_ins) was introduced in UEFI spec version 2,
* and (u64 capsule_support) was introduced in version 3.
* The size needs to be adjusted accordingly. That is to
* say, version 1 should subtract the size of hw_ins+capsule_support,
* and version 2 should sbstract the size of capsule_support.
*/
size += sizeof(struct efi_manage_capsule_image_header);
switch (img_hdr->ver) {
case 1:
return size - 2 * sizeof(u64);
case 2:
return size - sizeof(u64);
default:
/* only support version 1 and 2 */
return -EINVAL;
}
}
static bool applicable_image(const void *data, struct pfru_update_cap_info *cap,
struct pfru_device *pfru_dev)
{
struct pfru_payload_hdr *payload_hdr;
const efi_capsule_header_t *cap_hdr = data;
const struct efi_manage_capsule_header *m_hdr;
const struct efi_manage_capsule_image_header *m_img_hdr;
const struct efi_image_auth *auth;
int type, size;
/*
* If the code in the capsule is older than the current
* firmware code, the update will be rejected by the firmware,
* so check the version of it upfront without engaging the
* Management Mode update mechanism which may be costly.
*/
size = cap_hdr->headersize;
m_hdr = data + size;
/*
* Current data structure size plus variable array indicated
* by number of (emb_drv_cnt + payload_cnt)
*/
size += offsetof(struct efi_manage_capsule_header, offset_list) +
(m_hdr->emb_drv_cnt + m_hdr->payload_cnt) * sizeof(u64);
m_img_hdr = data + size;
type = get_image_type(m_img_hdr, pfru_dev);
if (type < 0)
return false;
size = adjust_efi_size(m_img_hdr, size);
if (size < 0)
return false;
auth = data + size;
size += sizeof(u64) + auth->auth_info.hdr.len;
payload_hdr = (struct pfru_payload_hdr *)(data + size);
/* finally compare the version */
if (type == PFRU_CODE_INJECT_TYPE)
return payload_hdr->rt_ver >= cap->code_rt_version;
return payload_hdr->rt_ver >= cap->drv_rt_version;
}
static void print_update_debug_info(struct pfru_updated_result *result,
struct pfru_device *pfru_dev)
{
dev_dbg(pfru_dev->parent_dev, "Update result:\n");
dev_dbg(pfru_dev->parent_dev, "Authentication Time Low:%lld\n",
result->low_auth_time);
dev_dbg(pfru_dev->parent_dev, "Authentication Time High:%lld\n",
result->high_auth_time);
dev_dbg(pfru_dev->parent_dev, "Execution Time Low:%lld\n",
result->low_exec_time);
dev_dbg(pfru_dev->parent_dev, "Execution Time High:%lld\n",
result->high_exec_time);
}
static int start_update(int action, struct pfru_device *pfru_dev)
{
union acpi_object *out_obj, in_obj, in_buf;
struct pfru_updated_result update_result;
acpi_handle handle;
int ret = -EINVAL;
memset(&in_obj, 0, sizeof(in_obj));
memset(&in_buf, 0, sizeof(in_buf));
in_obj.type = ACPI_TYPE_PACKAGE;
in_obj.package.count = 1;
in_obj.package.elements = &in_buf;
in_buf.type = ACPI_TYPE_INTEGER;
in_buf.integer.value = action;
handle = ACPI_HANDLE(pfru_dev->parent_dev);
out_obj = acpi_evaluate_dsm_typed(handle, &pfru_guid,
pfru_dev->rev_id, PFRU_FUNC_START,
&in_obj, ACPI_TYPE_PACKAGE);
if (!out_obj)
return ret;
if (out_obj->package.count < UPDATE_NR_IDX ||
out_obj->package.elements[UPDATE_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
out_obj->package.elements[UPDATE_EXT_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
out_obj->package.elements[UPDATE_AUTH_TIME_LOW_IDX].type != ACPI_TYPE_INTEGER ||
out_obj->package.elements[UPDATE_AUTH_TIME_HI_IDX].type != ACPI_TYPE_INTEGER ||
out_obj->package.elements[UPDATE_EXEC_TIME_LOW_IDX].type != ACPI_TYPE_INTEGER ||
out_obj->package.elements[UPDATE_EXEC_TIME_HI_IDX].type != ACPI_TYPE_INTEGER)
goto free_acpi_buffer;
update_result.status =
out_obj->package.elements[UPDATE_STATUS_IDX].integer.value;
update_result.ext_status =
out_obj->package.elements[UPDATE_EXT_STATUS_IDX].integer.value;
if (update_result.status != DSM_SUCCEED) {
ret = -EBUSY;
dev_dbg(pfru_dev->parent_dev, "Error Status:%d\n", update_result.status);
dev_dbg(pfru_dev->parent_dev, "Error Extended Status:%d\n",
update_result.ext_status);
goto free_acpi_buffer;
}
update_result.low_auth_time =
out_obj->package.elements[UPDATE_AUTH_TIME_LOW_IDX].integer.value;
update_result.high_auth_time =
out_obj->package.elements[UPDATE_AUTH_TIME_HI_IDX].integer.value;
update_result.low_exec_time =
out_obj->package.elements[UPDATE_EXEC_TIME_LOW_IDX].integer.value;
update_result.high_exec_time =
out_obj->package.elements[UPDATE_EXEC_TIME_HI_IDX].integer.value;
print_update_debug_info(&update_result, pfru_dev);
ret = 0;
free_acpi_buffer:
ACPI_FREE(out_obj);
return ret;
}
static long pfru_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct pfru_update_cap_info cap_hdr;
struct pfru_device *pfru_dev = to_pfru_dev(file);
void __user *p = (void __user *)arg;
u32 rev;
int ret;
switch (cmd) {
case PFRU_IOC_QUERY_CAP:
ret = query_capability(&cap_hdr, pfru_dev);
if (ret)
return ret;
if (copy_to_user(p, &cap_hdr, sizeof(cap_hdr)))
return -EFAULT;
return 0;
case PFRU_IOC_SET_REV:
if (copy_from_user(&rev, p, sizeof(rev)))
return -EFAULT;
if (!pfru_valid_revid(rev))
return -EINVAL;
pfru_dev->rev_id = rev;
return 0;
case PFRU_IOC_STAGE:
return start_update(START_STAGE, pfru_dev);
case PFRU_IOC_ACTIVATE:
return start_update(START_ACTIVATE, pfru_dev);
case PFRU_IOC_STAGE_ACTIVATE:
return start_update(START_STAGE_ACTIVATE, pfru_dev);
default:
return -ENOTTY;
}
}
static ssize_t pfru_write(struct file *file, const char __user *buf,
size_t len, loff_t *ppos)
{
struct pfru_device *pfru_dev = to_pfru_dev(file);
struct pfru_update_cap_info cap;
struct pfru_com_buf_info buf_info;
phys_addr_t phy_addr;
struct iov_iter iter;
struct iovec iov;
char *buf_ptr;
int ret;
ret = query_buffer(&buf_info, pfru_dev);
if (ret)
return ret;
if (len > buf_info.buf_size)
return -EINVAL;
iov.iov_base = (void __user *)buf;
iov.iov_len = len;
iov_iter_init(&iter, ITER_SOURCE, &iov, 1, len);
/* map the communication buffer */
phy_addr = (phys_addr_t)((buf_info.addr_hi << 32) | buf_info.addr_lo);
buf_ptr = memremap(phy_addr, buf_info.buf_size, MEMREMAP_WB);
if (!buf_ptr)
return -ENOMEM;
if (!copy_from_iter_full(buf_ptr, len, &iter)) {
ret = -EINVAL;
goto unmap;
}
/* check if the capsule header has a valid version number */
ret = query_capability(&cap, pfru_dev);
if (ret)
goto unmap;
if (!applicable_image(buf_ptr, &cap, pfru_dev))
ret = -EINVAL;
unmap:
memunmap(buf_ptr);
return ret ?: len;
}
static const struct file_operations acpi_pfru_fops = {
.owner = THIS_MODULE,
.write = pfru_write,
.unlocked_ioctl = pfru_ioctl,
.llseek = noop_llseek,
};
static int acpi_pfru_remove(struct platform_device *pdev)
{
struct pfru_device *pfru_dev = platform_get_drvdata(pdev);
misc_deregister(&pfru_dev->miscdev);
return 0;
}
static void pfru_put_idx(void *data)
{
struct pfru_device *pfru_dev = data;
ida_free(&pfru_ida, pfru_dev->index);
}
static int acpi_pfru_probe(struct platform_device *pdev)
{
acpi_handle handle = ACPI_HANDLE(&pdev->dev);
struct pfru_device *pfru_dev;
int ret;
if (!acpi_has_method(handle, "_DSM")) {
dev_dbg(&pdev->dev, "Missing _DSM\n");
return -ENODEV;
}
pfru_dev = devm_kzalloc(&pdev->dev, sizeof(*pfru_dev), GFP_KERNEL);
if (!pfru_dev)
return -ENOMEM;
ret = ida_alloc(&pfru_ida, GFP_KERNEL);
if (ret < 0)
return ret;
pfru_dev->index = ret;
ret = devm_add_action_or_reset(&pdev->dev, pfru_put_idx, pfru_dev);
if (ret)
return ret;
pfru_dev->rev_id = PFRU_DEFAULT_REV_ID;
pfru_dev->parent_dev = &pdev->dev;
pfru_dev->miscdev.minor = MISC_DYNAMIC_MINOR;
pfru_dev->miscdev.name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
"pfru%d", pfru_dev->index);
if (!pfru_dev->miscdev.name)
return -ENOMEM;
pfru_dev->miscdev.nodename = devm_kasprintf(&pdev->dev, GFP_KERNEL,
"acpi_pfr_update%d", pfru_dev->index);
if (!pfru_dev->miscdev.nodename)
return -ENOMEM;
pfru_dev->miscdev.fops = &acpi_pfru_fops;
pfru_dev->miscdev.parent = &pdev->dev;
ret = misc_register(&pfru_dev->miscdev);
if (ret)
return ret;
platform_set_drvdata(pdev, pfru_dev);
return 0;
}
static const struct acpi_device_id acpi_pfru_ids[] = {
{"INTC1080"},
{}
};
MODULE_DEVICE_TABLE(acpi, acpi_pfru_ids);
static struct platform_driver acpi_pfru_driver = {
.driver = {
.name = "pfr_update",
.acpi_match_table = acpi_pfru_ids,
},
.probe = acpi_pfru_probe,
.remove = acpi_pfru_remove,
};
module_platform_driver(acpi_pfru_driver);
MODULE_DESCRIPTION("Platform Firmware Runtime Update device driver");
MODULE_LICENSE("GPL v2");