diff options
Diffstat (limited to 'drivers/acpi/pfr_telemetry.c')
| -rw-r--r-- | drivers/acpi/pfr_telemetry.c | 435 |
1 files changed, 435 insertions, 0 deletions
diff --git a/drivers/acpi/pfr_telemetry.c b/drivers/acpi/pfr_telemetry.c new file mode 100644 index 000000000..27fb6cdad --- /dev/null +++ b/drivers/acpi/pfr_telemetry.c @@ -0,0 +1,435 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ACPI Platform Firmware Runtime Telemetry driver + * + * Copyright (C) 2021 Intel Corporation + * Author: Chen Yu <yu.c.chen@intel.com> + * + * This driver allows user space to fetch telemetry data from the + * firmware with the help of the Platform Firmware Runtime Telemetry + * interface. + */ +#include <linux/acpi.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/errno.h> +#include <linux/file.h> +#include <linux/fs.h> +#include <linux/miscdevice.h> +#include <linux/module.h> +#include <linux/mm.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 PFRT_LOG_EXEC_IDX 0 +#define PFRT_LOG_HISTORY_IDX 1 + +#define PFRT_LOG_ERR 0 +#define PFRT_LOG_WARN 1 +#define PFRT_LOG_INFO 2 +#define PFRT_LOG_VERB 4 + +#define PFRT_FUNC_SET_LEV 1 +#define PFRT_FUNC_GET_LEV 2 +#define PFRT_FUNC_GET_DATA 3 + +#define PFRT_REVID_1 1 +#define PFRT_REVID_2 2 +#define PFRT_DEFAULT_REV_ID PFRT_REVID_1 + +enum log_index { + LOG_STATUS_IDX = 0, + LOG_EXT_STATUS_IDX = 1, + LOG_MAX_SZ_IDX = 2, + LOG_CHUNK1_LO_IDX = 3, + LOG_CHUNK1_HI_IDX = 4, + LOG_CHUNK1_SZ_IDX = 5, + LOG_CHUNK2_LO_IDX = 6, + LOG_CHUNK2_HI_IDX = 7, + LOG_CHUNK2_SZ_IDX = 8, + LOG_ROLLOVER_CNT_IDX = 9, + LOG_RESET_CNT_IDX = 10, + LOG_NR_IDX +}; + +struct pfrt_log_device { + int index; + struct pfrt_log_info info; + struct device *parent_dev; + struct miscdevice miscdev; +}; + +/* pfrt_guid is the parameter for _DSM method */ +static const guid_t pfrt_log_guid = + GUID_INIT(0x75191659, 0x8178, 0x4D9D, 0xB8, 0x8F, 0xAC, 0x5E, + 0x5E, 0x93, 0xE8, 0xBF); + +static DEFINE_IDA(pfrt_log_ida); + +static inline struct pfrt_log_device *to_pfrt_log_dev(struct file *file) +{ + return container_of(file->private_data, struct pfrt_log_device, miscdev); +} + +static int get_pfrt_log_data_info(struct pfrt_log_data_info *data_info, + struct pfrt_log_device *pfrt_log_dev) +{ + acpi_handle handle = ACPI_HANDLE(pfrt_log_dev->parent_dev); + union acpi_object *out_obj, in_obj, in_buf; + int ret = -EBUSY; + + memset(data_info, 0, sizeof(*data_info)); + 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 = pfrt_log_dev->info.log_type; + + out_obj = acpi_evaluate_dsm_typed(handle, &pfrt_log_guid, + pfrt_log_dev->info.log_revid, PFRT_FUNC_GET_DATA, + &in_obj, ACPI_TYPE_PACKAGE); + if (!out_obj) + return -EINVAL; + + if (out_obj->package.count < LOG_NR_IDX || + out_obj->package.elements[LOG_STATUS_IDX].type != ACPI_TYPE_INTEGER || + out_obj->package.elements[LOG_EXT_STATUS_IDX].type != ACPI_TYPE_INTEGER || + out_obj->package.elements[LOG_MAX_SZ_IDX].type != ACPI_TYPE_INTEGER || + out_obj->package.elements[LOG_CHUNK1_LO_IDX].type != ACPI_TYPE_INTEGER || + out_obj->package.elements[LOG_CHUNK1_HI_IDX].type != ACPI_TYPE_INTEGER || + out_obj->package.elements[LOG_CHUNK1_SZ_IDX].type != ACPI_TYPE_INTEGER || + out_obj->package.elements[LOG_CHUNK2_LO_IDX].type != ACPI_TYPE_INTEGER || + out_obj->package.elements[LOG_CHUNK2_HI_IDX].type != ACPI_TYPE_INTEGER || + out_obj->package.elements[LOG_CHUNK2_SZ_IDX].type != ACPI_TYPE_INTEGER || + out_obj->package.elements[LOG_ROLLOVER_CNT_IDX].type != ACPI_TYPE_INTEGER || + out_obj->package.elements[LOG_RESET_CNT_IDX].type != ACPI_TYPE_INTEGER) + goto free_acpi_buffer; + + data_info->status = out_obj->package.elements[LOG_STATUS_IDX].integer.value; + data_info->ext_status = + out_obj->package.elements[LOG_EXT_STATUS_IDX].integer.value; + if (data_info->status != DSM_SUCCEED) { + dev_dbg(pfrt_log_dev->parent_dev, "Error Status:%d\n", data_info->status); + dev_dbg(pfrt_log_dev->parent_dev, "Error Extend Status:%d\n", + data_info->ext_status); + goto free_acpi_buffer; + } + + data_info->max_data_size = + out_obj->package.elements[LOG_MAX_SZ_IDX].integer.value; + data_info->chunk1_addr_lo = + out_obj->package.elements[LOG_CHUNK1_LO_IDX].integer.value; + data_info->chunk1_addr_hi = + out_obj->package.elements[LOG_CHUNK1_HI_IDX].integer.value; + data_info->chunk1_size = + out_obj->package.elements[LOG_CHUNK1_SZ_IDX].integer.value; + data_info->chunk2_addr_lo = + out_obj->package.elements[LOG_CHUNK2_LO_IDX].integer.value; + data_info->chunk2_addr_hi = + out_obj->package.elements[LOG_CHUNK2_HI_IDX].integer.value; + data_info->chunk2_size = + out_obj->package.elements[LOG_CHUNK2_SZ_IDX].integer.value; + data_info->rollover_cnt = + out_obj->package.elements[LOG_ROLLOVER_CNT_IDX].integer.value; + data_info->reset_cnt = + out_obj->package.elements[LOG_RESET_CNT_IDX].integer.value; + + ret = 0; + +free_acpi_buffer: + ACPI_FREE(out_obj); + + return ret; +} + +static int set_pfrt_log_level(int level, struct pfrt_log_device *pfrt_log_dev) +{ + acpi_handle handle = ACPI_HANDLE(pfrt_log_dev->parent_dev); + union acpi_object *out_obj, *obj, in_obj, in_buf; + enum pfru_dsm_status status, ext_status; + int ret = 0; + + 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 = level; + + out_obj = acpi_evaluate_dsm_typed(handle, &pfrt_log_guid, + pfrt_log_dev->info.log_revid, PFRT_FUNC_SET_LEV, + &in_obj, ACPI_TYPE_PACKAGE); + if (!out_obj) + return -EINVAL; + + obj = &out_obj->package.elements[0]; + status = obj->integer.value; + if (status != DSM_SUCCEED) { + obj = &out_obj->package.elements[1]; + ext_status = obj->integer.value; + dev_dbg(pfrt_log_dev->parent_dev, "Error Status:%d\n", status); + dev_dbg(pfrt_log_dev->parent_dev, "Error Extend Status:%d\n", ext_status); + ret = -EBUSY; + } + + ACPI_FREE(out_obj); + + return ret; +} + +static int get_pfrt_log_level(struct pfrt_log_device *pfrt_log_dev) +{ + acpi_handle handle = ACPI_HANDLE(pfrt_log_dev->parent_dev); + union acpi_object *out_obj, *obj; + enum pfru_dsm_status status, ext_status; + int ret = -EBUSY; + + out_obj = acpi_evaluate_dsm_typed(handle, &pfrt_log_guid, + pfrt_log_dev->info.log_revid, PFRT_FUNC_GET_LEV, + NULL, ACPI_TYPE_PACKAGE); + if (!out_obj) + return -EINVAL; + + obj = &out_obj->package.elements[0]; + if (obj->type != ACPI_TYPE_INTEGER) + goto free_acpi_buffer; + + status = obj->integer.value; + if (status != DSM_SUCCEED) { + obj = &out_obj->package.elements[1]; + ext_status = obj->integer.value; + dev_dbg(pfrt_log_dev->parent_dev, "Error Status:%d\n", status); + dev_dbg(pfrt_log_dev->parent_dev, "Error Extend Status:%d\n", ext_status); + goto free_acpi_buffer; + } + + obj = &out_obj->package.elements[2]; + if (obj->type != ACPI_TYPE_INTEGER) + goto free_acpi_buffer; + + ret = obj->integer.value; + +free_acpi_buffer: + ACPI_FREE(out_obj); + + return ret; +} + +static int valid_log_level(u32 level) +{ + return level == PFRT_LOG_ERR || level == PFRT_LOG_WARN || + level == PFRT_LOG_INFO || level == PFRT_LOG_VERB; +} + +static int valid_log_type(u32 type) +{ + return type == PFRT_LOG_EXEC_IDX || type == PFRT_LOG_HISTORY_IDX; +} + +static inline int valid_log_revid(u32 id) +{ + return id == PFRT_REVID_1 || id == PFRT_REVID_2; +} + +static long pfrt_log_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + struct pfrt_log_device *pfrt_log_dev = to_pfrt_log_dev(file); + struct pfrt_log_data_info data_info; + struct pfrt_log_info info; + void __user *p; + int ret = 0; + + p = (void __user *)arg; + + switch (cmd) { + case PFRT_LOG_IOC_SET_INFO: + if (copy_from_user(&info, p, sizeof(info))) + return -EFAULT; + + if (valid_log_revid(info.log_revid)) + pfrt_log_dev->info.log_revid = info.log_revid; + + if (valid_log_level(info.log_level)) { + ret = set_pfrt_log_level(info.log_level, pfrt_log_dev); + if (ret < 0) + return ret; + + pfrt_log_dev->info.log_level = info.log_level; + } + + if (valid_log_type(info.log_type)) + pfrt_log_dev->info.log_type = info.log_type; + + return 0; + + case PFRT_LOG_IOC_GET_INFO: + info.log_level = get_pfrt_log_level(pfrt_log_dev); + if (ret < 0) + return ret; + + info.log_type = pfrt_log_dev->info.log_type; + info.log_revid = pfrt_log_dev->info.log_revid; + if (copy_to_user(p, &info, sizeof(info))) + return -EFAULT; + + return 0; + + case PFRT_LOG_IOC_GET_DATA_INFO: + ret = get_pfrt_log_data_info(&data_info, pfrt_log_dev); + if (ret) + return ret; + + if (copy_to_user(p, &data_info, sizeof(struct pfrt_log_data_info))) + return -EFAULT; + + return 0; + + default: + return -ENOTTY; + } +} + +static int +pfrt_log_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct pfrt_log_device *pfrt_log_dev; + struct pfrt_log_data_info info; + unsigned long psize, vsize; + phys_addr_t base_addr; + int ret; + + if (vma->vm_flags & VM_WRITE) + return -EROFS; + + /* changing from read to write with mprotect is not allowed */ + vma->vm_flags &= ~VM_MAYWRITE; + + pfrt_log_dev = to_pfrt_log_dev(file); + + ret = get_pfrt_log_data_info(&info, pfrt_log_dev); + if (ret) + return ret; + + base_addr = (phys_addr_t)((info.chunk2_addr_hi << 32) | info.chunk2_addr_lo); + /* pfrt update has not been launched yet */ + if (!base_addr) + return -ENODEV; + + psize = info.max_data_size; + /* base address and total buffer size must be page aligned */ + if (!PAGE_ALIGNED(base_addr) || !PAGE_ALIGNED(psize)) + return -ENODEV; + + vsize = vma->vm_end - vma->vm_start; + if (vsize > psize) + return -EINVAL; + + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); + if (io_remap_pfn_range(vma, vma->vm_start, PFN_DOWN(base_addr), + vsize, vma->vm_page_prot)) + return -EAGAIN; + + return 0; +} + +static const struct file_operations acpi_pfrt_log_fops = { + .owner = THIS_MODULE, + .mmap = pfrt_log_mmap, + .unlocked_ioctl = pfrt_log_ioctl, + .llseek = noop_llseek, +}; + +static int acpi_pfrt_log_remove(struct platform_device *pdev) +{ + struct pfrt_log_device *pfrt_log_dev = platform_get_drvdata(pdev); + + misc_deregister(&pfrt_log_dev->miscdev); + + return 0; +} + +static void pfrt_log_put_idx(void *data) +{ + struct pfrt_log_device *pfrt_log_dev = data; + + ida_free(&pfrt_log_ida, pfrt_log_dev->index); +} + +static int acpi_pfrt_log_probe(struct platform_device *pdev) +{ + acpi_handle handle = ACPI_HANDLE(&pdev->dev); + struct pfrt_log_device *pfrt_log_dev; + int ret; + + if (!acpi_has_method(handle, "_DSM")) { + dev_dbg(&pdev->dev, "Missing _DSM\n"); + return -ENODEV; + } + + pfrt_log_dev = devm_kzalloc(&pdev->dev, sizeof(*pfrt_log_dev), GFP_KERNEL); + if (!pfrt_log_dev) + return -ENOMEM; + + ret = ida_alloc(&pfrt_log_ida, GFP_KERNEL); + if (ret < 0) + return ret; + + pfrt_log_dev->index = ret; + ret = devm_add_action_or_reset(&pdev->dev, pfrt_log_put_idx, pfrt_log_dev); + if (ret) + return ret; + + pfrt_log_dev->info.log_revid = PFRT_DEFAULT_REV_ID; + pfrt_log_dev->parent_dev = &pdev->dev; + + pfrt_log_dev->miscdev.minor = MISC_DYNAMIC_MINOR; + pfrt_log_dev->miscdev.name = devm_kasprintf(&pdev->dev, GFP_KERNEL, + "pfrt%d", + pfrt_log_dev->index); + if (!pfrt_log_dev->miscdev.name) + return -ENOMEM; + + pfrt_log_dev->miscdev.nodename = devm_kasprintf(&pdev->dev, GFP_KERNEL, + "acpi_pfr_telemetry%d", + pfrt_log_dev->index); + if (!pfrt_log_dev->miscdev.nodename) + return -ENOMEM; + + pfrt_log_dev->miscdev.fops = &acpi_pfrt_log_fops; + pfrt_log_dev->miscdev.parent = &pdev->dev; + + ret = misc_register(&pfrt_log_dev->miscdev); + if (ret) + return ret; + + platform_set_drvdata(pdev, pfrt_log_dev); + + return 0; +} + +static const struct acpi_device_id acpi_pfrt_log_ids[] = { + {"INTC1081"}, + {} +}; +MODULE_DEVICE_TABLE(acpi, acpi_pfrt_log_ids); + +static struct platform_driver acpi_pfrt_log_driver = { + .driver = { + .name = "pfr_telemetry", + .acpi_match_table = acpi_pfrt_log_ids, + }, + .probe = acpi_pfrt_log_probe, + .remove = acpi_pfrt_log_remove, +}; +module_platform_driver(acpi_pfrt_log_driver); + +MODULE_DESCRIPTION("Platform Firmware Runtime Update Telemetry driver"); +MODULE_LICENSE("GPL v2"); |