--- /dev/null
+// 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(&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:
+ kfree(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;
+ }
+
+ kfree(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:
+ kfree(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");
projects / thirdparty / kernel / linux.git / commitdiff
