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7bf2e4d5ca
The "data_info" struct is copied to the user. It has a 4 byte struct
hole after the last struct member so we need to memset that to avoid
copying uninitialized stack data to the user.
Fixes: b0013e037a
("ACPI: Introduce Platform Firmware Runtime Telemetry driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
436 lines
12 KiB
C
436 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* ACPI Platform Firmware Runtime Telemetry driver
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*
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* Copyright (C) 2021 Intel Corporation
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* Author: Chen Yu <yu.c.chen@intel.com>
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*
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* This driver allows user space to fetch telemetry data from the
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* firmware with the help of the Platform Firmware Runtime Telemetry
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* interface.
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*/
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#include <linux/acpi.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/platform_device.h>
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#include <linux/string.h>
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#include <linux/uaccess.h>
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#include <linux/uio.h>
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#include <linux/uuid.h>
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#include <uapi/linux/pfrut.h>
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#define PFRT_LOG_EXEC_IDX 0
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#define PFRT_LOG_HISTORY_IDX 1
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#define PFRT_LOG_ERR 0
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#define PFRT_LOG_WARN 1
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#define PFRT_LOG_INFO 2
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#define PFRT_LOG_VERB 4
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#define PFRT_FUNC_SET_LEV 1
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#define PFRT_FUNC_GET_LEV 2
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#define PFRT_FUNC_GET_DATA 3
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#define PFRT_REVID_1 1
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#define PFRT_REVID_2 2
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#define PFRT_DEFAULT_REV_ID PFRT_REVID_1
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enum log_index {
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LOG_STATUS_IDX = 0,
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LOG_EXT_STATUS_IDX = 1,
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LOG_MAX_SZ_IDX = 2,
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LOG_CHUNK1_LO_IDX = 3,
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LOG_CHUNK1_HI_IDX = 4,
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LOG_CHUNK1_SZ_IDX = 5,
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LOG_CHUNK2_LO_IDX = 6,
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LOG_CHUNK2_HI_IDX = 7,
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LOG_CHUNK2_SZ_IDX = 8,
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LOG_ROLLOVER_CNT_IDX = 9,
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LOG_RESET_CNT_IDX = 10,
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LOG_NR_IDX
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};
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struct pfrt_log_device {
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int index;
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struct pfrt_log_info info;
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struct device *parent_dev;
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struct miscdevice miscdev;
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};
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/* pfrt_guid is the parameter for _DSM method */
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static const guid_t pfrt_log_guid =
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GUID_INIT(0x75191659, 0x8178, 0x4D9D, 0xB8, 0x8F, 0xAC, 0x5E,
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0x5E, 0x93, 0xE8, 0xBF);
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static DEFINE_IDA(pfrt_log_ida);
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static inline struct pfrt_log_device *to_pfrt_log_dev(struct file *file)
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{
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return container_of(file->private_data, struct pfrt_log_device, miscdev);
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}
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static int get_pfrt_log_data_info(struct pfrt_log_data_info *data_info,
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struct pfrt_log_device *pfrt_log_dev)
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{
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acpi_handle handle = ACPI_HANDLE(pfrt_log_dev->parent_dev);
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union acpi_object *out_obj, in_obj, in_buf;
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int ret = -EBUSY;
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memset(data_info, 0, sizeof(*data_info));
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memset(&in_obj, 0, sizeof(in_obj));
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memset(&in_buf, 0, sizeof(in_buf));
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in_obj.type = ACPI_TYPE_PACKAGE;
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in_obj.package.count = 1;
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in_obj.package.elements = &in_buf;
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in_buf.type = ACPI_TYPE_INTEGER;
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in_buf.integer.value = pfrt_log_dev->info.log_type;
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out_obj = acpi_evaluate_dsm_typed(handle, &pfrt_log_guid,
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pfrt_log_dev->info.log_revid, PFRT_FUNC_GET_DATA,
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&in_obj, ACPI_TYPE_PACKAGE);
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if (!out_obj)
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return -EINVAL;
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if (out_obj->package.count < LOG_NR_IDX ||
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out_obj->package.elements[LOG_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[LOG_EXT_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[LOG_MAX_SZ_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[LOG_CHUNK1_LO_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[LOG_CHUNK1_HI_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[LOG_CHUNK1_SZ_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[LOG_CHUNK2_LO_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[LOG_CHUNK2_HI_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[LOG_CHUNK2_SZ_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[LOG_ROLLOVER_CNT_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[LOG_RESET_CNT_IDX].type != ACPI_TYPE_INTEGER)
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goto free_acpi_buffer;
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data_info->status = out_obj->package.elements[LOG_STATUS_IDX].integer.value;
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data_info->ext_status =
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out_obj->package.elements[LOG_EXT_STATUS_IDX].integer.value;
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if (data_info->status != DSM_SUCCEED) {
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dev_dbg(pfrt_log_dev->parent_dev, "Error Status:%d\n", data_info->status);
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dev_dbg(pfrt_log_dev->parent_dev, "Error Extend Status:%d\n",
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data_info->ext_status);
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goto free_acpi_buffer;
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}
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data_info->max_data_size =
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out_obj->package.elements[LOG_MAX_SZ_IDX].integer.value;
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data_info->chunk1_addr_lo =
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out_obj->package.elements[LOG_CHUNK1_LO_IDX].integer.value;
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data_info->chunk1_addr_hi =
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out_obj->package.elements[LOG_CHUNK1_HI_IDX].integer.value;
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data_info->chunk1_size =
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out_obj->package.elements[LOG_CHUNK1_SZ_IDX].integer.value;
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data_info->chunk2_addr_lo =
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out_obj->package.elements[LOG_CHUNK2_LO_IDX].integer.value;
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data_info->chunk2_addr_hi =
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out_obj->package.elements[LOG_CHUNK2_HI_IDX].integer.value;
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data_info->chunk2_size =
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out_obj->package.elements[LOG_CHUNK2_SZ_IDX].integer.value;
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data_info->rollover_cnt =
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out_obj->package.elements[LOG_ROLLOVER_CNT_IDX].integer.value;
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data_info->reset_cnt =
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out_obj->package.elements[LOG_RESET_CNT_IDX].integer.value;
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ret = 0;
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free_acpi_buffer:
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kfree(out_obj);
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return ret;
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}
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static int set_pfrt_log_level(int level, struct pfrt_log_device *pfrt_log_dev)
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{
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acpi_handle handle = ACPI_HANDLE(pfrt_log_dev->parent_dev);
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union acpi_object *out_obj, *obj, in_obj, in_buf;
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enum pfru_dsm_status status, ext_status;
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int ret = 0;
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memset(&in_obj, 0, sizeof(in_obj));
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memset(&in_buf, 0, sizeof(in_buf));
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in_obj.type = ACPI_TYPE_PACKAGE;
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in_obj.package.count = 1;
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in_obj.package.elements = &in_buf;
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in_buf.type = ACPI_TYPE_INTEGER;
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in_buf.integer.value = level;
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out_obj = acpi_evaluate_dsm_typed(handle, &pfrt_log_guid,
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pfrt_log_dev->info.log_revid, PFRT_FUNC_SET_LEV,
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&in_obj, ACPI_TYPE_PACKAGE);
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if (!out_obj)
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return -EINVAL;
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obj = &out_obj->package.elements[0];
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status = obj->integer.value;
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if (status != DSM_SUCCEED) {
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obj = &out_obj->package.elements[1];
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ext_status = obj->integer.value;
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dev_dbg(pfrt_log_dev->parent_dev, "Error Status:%d\n", status);
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dev_dbg(pfrt_log_dev->parent_dev, "Error Extend Status:%d\n", ext_status);
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ret = -EBUSY;
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}
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kfree(out_obj);
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return ret;
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}
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static int get_pfrt_log_level(struct pfrt_log_device *pfrt_log_dev)
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{
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acpi_handle handle = ACPI_HANDLE(pfrt_log_dev->parent_dev);
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union acpi_object *out_obj, *obj;
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enum pfru_dsm_status status, ext_status;
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int ret = -EBUSY;
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out_obj = acpi_evaluate_dsm_typed(handle, &pfrt_log_guid,
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pfrt_log_dev->info.log_revid, PFRT_FUNC_GET_LEV,
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NULL, ACPI_TYPE_PACKAGE);
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if (!out_obj)
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return -EINVAL;
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obj = &out_obj->package.elements[0];
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if (obj->type != ACPI_TYPE_INTEGER)
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goto free_acpi_buffer;
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status = obj->integer.value;
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if (status != DSM_SUCCEED) {
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obj = &out_obj->package.elements[1];
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ext_status = obj->integer.value;
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dev_dbg(pfrt_log_dev->parent_dev, "Error Status:%d\n", status);
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dev_dbg(pfrt_log_dev->parent_dev, "Error Extend Status:%d\n", ext_status);
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goto free_acpi_buffer;
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}
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obj = &out_obj->package.elements[2];
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if (obj->type != ACPI_TYPE_INTEGER)
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goto free_acpi_buffer;
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ret = obj->integer.value;
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free_acpi_buffer:
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kfree(out_obj);
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return ret;
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}
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static int valid_log_level(u32 level)
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{
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return level == PFRT_LOG_ERR || level == PFRT_LOG_WARN ||
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level == PFRT_LOG_INFO || level == PFRT_LOG_VERB;
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}
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static int valid_log_type(u32 type)
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{
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return type == PFRT_LOG_EXEC_IDX || type == PFRT_LOG_HISTORY_IDX;
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}
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static inline int valid_log_revid(u32 id)
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{
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return id == PFRT_REVID_1 || id == PFRT_REVID_2;
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}
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static long pfrt_log_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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struct pfrt_log_device *pfrt_log_dev = to_pfrt_log_dev(file);
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struct pfrt_log_data_info data_info;
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struct pfrt_log_info info;
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void __user *p;
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int ret = 0;
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p = (void __user *)arg;
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switch (cmd) {
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case PFRT_LOG_IOC_SET_INFO:
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if (copy_from_user(&info, p, sizeof(info)))
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return -EFAULT;
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if (valid_log_revid(info.log_revid))
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pfrt_log_dev->info.log_revid = info.log_revid;
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if (valid_log_level(info.log_level)) {
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ret = set_pfrt_log_level(info.log_level, pfrt_log_dev);
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if (ret < 0)
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return ret;
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pfrt_log_dev->info.log_level = info.log_level;
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}
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if (valid_log_type(info.log_type))
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pfrt_log_dev->info.log_type = info.log_type;
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return 0;
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case PFRT_LOG_IOC_GET_INFO:
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info.log_level = get_pfrt_log_level(pfrt_log_dev);
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if (ret < 0)
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return ret;
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info.log_type = pfrt_log_dev->info.log_type;
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info.log_revid = pfrt_log_dev->info.log_revid;
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if (copy_to_user(p, &info, sizeof(info)))
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return -EFAULT;
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return 0;
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case PFRT_LOG_IOC_GET_DATA_INFO:
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ret = get_pfrt_log_data_info(&data_info, pfrt_log_dev);
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if (ret)
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return ret;
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if (copy_to_user(p, &data_info, sizeof(struct pfrt_log_data_info)))
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return -EFAULT;
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return 0;
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default:
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return -ENOTTY;
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}
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}
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static int
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pfrt_log_mmap(struct file *file, struct vm_area_struct *vma)
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{
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struct pfrt_log_device *pfrt_log_dev;
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struct pfrt_log_data_info info;
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unsigned long psize, vsize;
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phys_addr_t base_addr;
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int ret;
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if (vma->vm_flags & VM_WRITE)
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return -EROFS;
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/* changing from read to write with mprotect is not allowed */
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vma->vm_flags &= ~VM_MAYWRITE;
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pfrt_log_dev = to_pfrt_log_dev(file);
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ret = get_pfrt_log_data_info(&info, pfrt_log_dev);
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if (ret)
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return ret;
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base_addr = (phys_addr_t)((info.chunk2_addr_hi << 32) | info.chunk2_addr_lo);
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/* pfrt update has not been launched yet */
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if (!base_addr)
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return -ENODEV;
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psize = info.max_data_size;
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/* base address and total buffer size must be page aligned */
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if (!PAGE_ALIGNED(base_addr) || !PAGE_ALIGNED(psize))
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return -ENODEV;
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vsize = vma->vm_end - vma->vm_start;
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if (vsize > psize)
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return -EINVAL;
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vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
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if (io_remap_pfn_range(vma, vma->vm_start, PFN_DOWN(base_addr),
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vsize, vma->vm_page_prot))
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return -EAGAIN;
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return 0;
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}
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static const struct file_operations acpi_pfrt_log_fops = {
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.owner = THIS_MODULE,
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.mmap = pfrt_log_mmap,
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.unlocked_ioctl = pfrt_log_ioctl,
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.llseek = noop_llseek,
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};
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static int acpi_pfrt_log_remove(struct platform_device *pdev)
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{
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struct pfrt_log_device *pfrt_log_dev = platform_get_drvdata(pdev);
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misc_deregister(&pfrt_log_dev->miscdev);
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return 0;
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}
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static void pfrt_log_put_idx(void *data)
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{
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struct pfrt_log_device *pfrt_log_dev = data;
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ida_free(&pfrt_log_ida, pfrt_log_dev->index);
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}
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static int acpi_pfrt_log_probe(struct platform_device *pdev)
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{
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acpi_handle handle = ACPI_HANDLE(&pdev->dev);
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struct pfrt_log_device *pfrt_log_dev;
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int ret;
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if (!acpi_has_method(handle, "_DSM")) {
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dev_dbg(&pdev->dev, "Missing _DSM\n");
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return -ENODEV;
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}
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pfrt_log_dev = devm_kzalloc(&pdev->dev, sizeof(*pfrt_log_dev), GFP_KERNEL);
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if (!pfrt_log_dev)
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return -ENOMEM;
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ret = ida_alloc(&pfrt_log_ida, GFP_KERNEL);
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if (ret < 0)
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return ret;
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pfrt_log_dev->index = ret;
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ret = devm_add_action_or_reset(&pdev->dev, pfrt_log_put_idx, pfrt_log_dev);
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if (ret)
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return ret;
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pfrt_log_dev->info.log_revid = PFRT_DEFAULT_REV_ID;
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pfrt_log_dev->parent_dev = &pdev->dev;
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pfrt_log_dev->miscdev.minor = MISC_DYNAMIC_MINOR;
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pfrt_log_dev->miscdev.name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
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"pfrt%d",
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pfrt_log_dev->index);
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if (!pfrt_log_dev->miscdev.name)
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return -ENOMEM;
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pfrt_log_dev->miscdev.nodename = devm_kasprintf(&pdev->dev, GFP_KERNEL,
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"acpi_pfr_telemetry%d",
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pfrt_log_dev->index);
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if (!pfrt_log_dev->miscdev.nodename)
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return -ENOMEM;
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pfrt_log_dev->miscdev.fops = &acpi_pfrt_log_fops;
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pfrt_log_dev->miscdev.parent = &pdev->dev;
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ret = misc_register(&pfrt_log_dev->miscdev);
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if (ret)
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return ret;
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platform_set_drvdata(pdev, pfrt_log_dev);
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return 0;
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}
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static const struct acpi_device_id acpi_pfrt_log_ids[] = {
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{"INTC1081"},
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{}
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};
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MODULE_DEVICE_TABLE(acpi, acpi_pfrt_log_ids);
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static struct platform_driver acpi_pfrt_log_driver = {
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.driver = {
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.name = "pfr_telemetry",
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.acpi_match_table = acpi_pfrt_log_ids,
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},
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.probe = acpi_pfrt_log_probe,
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.remove = acpi_pfrt_log_remove,
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};
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module_platform_driver(acpi_pfrt_log_driver);
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MODULE_DESCRIPTION("Platform Firmware Runtime Update Telemetry driver");
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MODULE_LICENSE("GPL v2");
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