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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ACPI Platform Firmware Runtime Telemetry driver
4 *
5 * Copyright (C) 2021 Intel Corporation
6 * Author: Chen Yu <yu.c.chen@intel.com>
7 *
8 * This driver allows user space to fetch telemetry data from the
9 * firmware with the help of the Platform Firmware Runtime Telemetry
10 * interface.
11 */
12#include <linux/acpi.h>
13#include <linux/device.h>
14#include <linux/err.h>
15#include <linux/errno.h>
16#include <linux/file.h>
17#include <linux/fs.h>
18#include <linux/miscdevice.h>
19#include <linux/module.h>
20#include <linux/mm.h>
21#include <linux/platform_device.h>
22#include <linux/string.h>
23#include <linux/uaccess.h>
24#include <linux/uio.h>
25#include <linux/uuid.h>
26
27#include <uapi/linux/pfrut.h>
28
29#define PFRT_LOG_EXEC_IDX 0
30#define PFRT_LOG_HISTORY_IDX 1
31
32#define PFRT_LOG_ERR 0
33#define PFRT_LOG_WARN 1
34#define PFRT_LOG_INFO 2
35#define PFRT_LOG_VERB 4
36
37#define PFRT_FUNC_SET_LEV 1
38#define PFRT_FUNC_GET_LEV 2
39#define PFRT_FUNC_GET_DATA 3
40
41#define PFRT_REVID_1 1
42#define PFRT_REVID_2 2
43#define PFRT_DEFAULT_REV_ID PFRT_REVID_1
44
45enum log_index {
46 LOG_STATUS_IDX = 0,
47 LOG_EXT_STATUS_IDX = 1,
48 LOG_MAX_SZ_IDX = 2,
49 LOG_CHUNK1_LO_IDX = 3,
50 LOG_CHUNK1_HI_IDX = 4,
51 LOG_CHUNK1_SZ_IDX = 5,
52 LOG_CHUNK2_LO_IDX = 6,
53 LOG_CHUNK2_HI_IDX = 7,
54 LOG_CHUNK2_SZ_IDX = 8,
55 LOG_ROLLOVER_CNT_IDX = 9,
56 LOG_RESET_CNT_IDX = 10,
57 LOG_NR_IDX
58};
59
60struct pfrt_log_device {
61 int index;
62 struct pfrt_log_info info;
63 struct device *parent_dev;
64 struct miscdevice miscdev;
65};
66
67/* pfrt_guid is the parameter for _DSM method */
68static const guid_t pfrt_log_guid =
69 GUID_INIT(0x75191659, 0x8178, 0x4D9D, 0xB8, 0x8F, 0xAC, 0x5E,
70 0x5E, 0x93, 0xE8, 0xBF);
71
72static DEFINE_IDA(pfrt_log_ida);
73
74static inline struct pfrt_log_device *to_pfrt_log_dev(struct file *file)
75{
76 return container_of(file->private_data, struct pfrt_log_device, miscdev);
77}
78
79static int get_pfrt_log_data_info(struct pfrt_log_data_info *data_info,
80 struct pfrt_log_device *pfrt_log_dev)
81{
82 acpi_handle handle = ACPI_HANDLE(pfrt_log_dev->parent_dev);
83 union acpi_object *out_obj, in_obj, in_buf;
84 int ret = -EBUSY;
85
86 memset(data_info, 0, sizeof(*data_info));
87 memset(&in_obj, 0, sizeof(in_obj));
88 memset(&in_buf, 0, sizeof(in_buf));
89 in_obj.type = ACPI_TYPE_PACKAGE;
90 in_obj.package.count = 1;
91 in_obj.package.elements = &in_buf;
92 in_buf.type = ACPI_TYPE_INTEGER;
93 in_buf.integer.value = pfrt_log_dev->info.log_type;
94
95 out_obj = acpi_evaluate_dsm_typed(handle, &pfrt_log_guid,
96 pfrt_log_dev->info.log_revid, PFRT_FUNC_GET_DATA,
97 &in_obj, ACPI_TYPE_PACKAGE);
98 if (!out_obj)
99 return -EINVAL;
100
101 if (out_obj->package.count < LOG_NR_IDX ||
102 out_obj->package.elements[LOG_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
103 out_obj->package.elements[LOG_EXT_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
104 out_obj->package.elements[LOG_MAX_SZ_IDX].type != ACPI_TYPE_INTEGER ||
105 out_obj->package.elements[LOG_CHUNK1_LO_IDX].type != ACPI_TYPE_INTEGER ||
106 out_obj->package.elements[LOG_CHUNK1_HI_IDX].type != ACPI_TYPE_INTEGER ||
107 out_obj->package.elements[LOG_CHUNK1_SZ_IDX].type != ACPI_TYPE_INTEGER ||
108 out_obj->package.elements[LOG_CHUNK2_LO_IDX].type != ACPI_TYPE_INTEGER ||
109 out_obj->package.elements[LOG_CHUNK2_HI_IDX].type != ACPI_TYPE_INTEGER ||
110 out_obj->package.elements[LOG_CHUNK2_SZ_IDX].type != ACPI_TYPE_INTEGER ||
111 out_obj->package.elements[LOG_ROLLOVER_CNT_IDX].type != ACPI_TYPE_INTEGER ||
112 out_obj->package.elements[LOG_RESET_CNT_IDX].type != ACPI_TYPE_INTEGER)
113 goto free_acpi_buffer;
114
115 data_info->status = out_obj->package.elements[LOG_STATUS_IDX].integer.value;
116 data_info->ext_status =
117 out_obj->package.elements[LOG_EXT_STATUS_IDX].integer.value;
118 if (data_info->status != DSM_SUCCEED) {
119 dev_dbg(pfrt_log_dev->parent_dev, "Error Status:%d\n", data_info->status);
120 dev_dbg(pfrt_log_dev->parent_dev, "Error Extend Status:%d\n",
121 data_info->ext_status);
122 goto free_acpi_buffer;
123 }
124
125 data_info->max_data_size =
126 out_obj->package.elements[LOG_MAX_SZ_IDX].integer.value;
127 data_info->chunk1_addr_lo =
128 out_obj->package.elements[LOG_CHUNK1_LO_IDX].integer.value;
129 data_info->chunk1_addr_hi =
130 out_obj->package.elements[LOG_CHUNK1_HI_IDX].integer.value;
131 data_info->chunk1_size =
132 out_obj->package.elements[LOG_CHUNK1_SZ_IDX].integer.value;
133 data_info->chunk2_addr_lo =
134 out_obj->package.elements[LOG_CHUNK2_LO_IDX].integer.value;
135 data_info->chunk2_addr_hi =
136 out_obj->package.elements[LOG_CHUNK2_HI_IDX].integer.value;
137 data_info->chunk2_size =
138 out_obj->package.elements[LOG_CHUNK2_SZ_IDX].integer.value;
139 data_info->rollover_cnt =
140 out_obj->package.elements[LOG_ROLLOVER_CNT_IDX].integer.value;
141 data_info->reset_cnt =
142 out_obj->package.elements[LOG_RESET_CNT_IDX].integer.value;
143
144 ret = 0;
145
146free_acpi_buffer:
147 ACPI_FREE(out_obj);
148
149 return ret;
150}
151
152static int set_pfrt_log_level(int level, struct pfrt_log_device *pfrt_log_dev)
153{
154 acpi_handle handle = ACPI_HANDLE(pfrt_log_dev->parent_dev);
155 union acpi_object *out_obj, *obj, in_obj, in_buf;
156 enum pfru_dsm_status status, ext_status;
157 int ret = 0;
158
159 memset(&in_obj, 0, sizeof(in_obj));
160 memset(&in_buf, 0, sizeof(in_buf));
161 in_obj.type = ACPI_TYPE_PACKAGE;
162 in_obj.package.count = 1;
163 in_obj.package.elements = &in_buf;
164 in_buf.type = ACPI_TYPE_INTEGER;
165 in_buf.integer.value = level;
166
167 out_obj = acpi_evaluate_dsm_typed(handle, &pfrt_log_guid,
168 pfrt_log_dev->info.log_revid, PFRT_FUNC_SET_LEV,
169 &in_obj, ACPI_TYPE_PACKAGE);
170 if (!out_obj)
171 return -EINVAL;
172
173 obj = &out_obj->package.elements[0];
174 status = obj->integer.value;
175 if (status != DSM_SUCCEED) {
176 obj = &out_obj->package.elements[1];
177 ext_status = obj->integer.value;
178 dev_dbg(pfrt_log_dev->parent_dev, "Error Status:%d\n", status);
179 dev_dbg(pfrt_log_dev->parent_dev, "Error Extend Status:%d\n", ext_status);
180 ret = -EBUSY;
181 }
182
183 ACPI_FREE(out_obj);
184
185 return ret;
186}
187
188static int get_pfrt_log_level(struct pfrt_log_device *pfrt_log_dev)
189{
190 acpi_handle handle = ACPI_HANDLE(pfrt_log_dev->parent_dev);
191 union acpi_object *out_obj, *obj;
192 enum pfru_dsm_status status, ext_status;
193 int ret = -EBUSY;
194
195 out_obj = acpi_evaluate_dsm_typed(handle, &pfrt_log_guid,
196 pfrt_log_dev->info.log_revid, PFRT_FUNC_GET_LEV,
197 NULL, ACPI_TYPE_PACKAGE);
198 if (!out_obj)
199 return -EINVAL;
200
201 obj = &out_obj->package.elements[0];
202 if (obj->type != ACPI_TYPE_INTEGER)
203 goto free_acpi_buffer;
204
205 status = obj->integer.value;
206 if (status != DSM_SUCCEED) {
207 obj = &out_obj->package.elements[1];
208 ext_status = obj->integer.value;
209 dev_dbg(pfrt_log_dev->parent_dev, "Error Status:%d\n", status);
210 dev_dbg(pfrt_log_dev->parent_dev, "Error Extend Status:%d\n", ext_status);
211 goto free_acpi_buffer;
212 }
213
214 obj = &out_obj->package.elements[2];
215 if (obj->type != ACPI_TYPE_INTEGER)
216 goto free_acpi_buffer;
217
218 ret = obj->integer.value;
219
220free_acpi_buffer:
221 ACPI_FREE(out_obj);
222
223 return ret;
224}
225
226static int valid_log_level(u32 level)
227{
228 return level == PFRT_LOG_ERR || level == PFRT_LOG_WARN ||
229 level == PFRT_LOG_INFO || level == PFRT_LOG_VERB;
230}
231
232static int valid_log_type(u32 type)
233{
234 return type == PFRT_LOG_EXEC_IDX || type == PFRT_LOG_HISTORY_IDX;
235}
236
237static inline int valid_log_revid(u32 id)
238{
239 return id == PFRT_REVID_1 || id == PFRT_REVID_2;
240}
241
242static long pfrt_log_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
243{
244 struct pfrt_log_device *pfrt_log_dev = to_pfrt_log_dev(file);
245 struct pfrt_log_data_info data_info;
246 struct pfrt_log_info info;
247 void __user *p;
248 int ret = 0;
249
250 p = (void __user *)arg;
251
252 switch (cmd) {
253 case PFRT_LOG_IOC_SET_INFO:
254 if (copy_from_user(&info, p, sizeof(info)))
255 return -EFAULT;
256
257 if (valid_log_revid(info.log_revid))
258 pfrt_log_dev->info.log_revid = info.log_revid;
259
260 if (valid_log_level(info.log_level)) {
261 ret = set_pfrt_log_level(info.log_level, pfrt_log_dev);
262 if (ret < 0)
263 return ret;
264
265 pfrt_log_dev->info.log_level = info.log_level;
266 }
267
268 if (valid_log_type(info.log_type))
269 pfrt_log_dev->info.log_type = info.log_type;
270
271 return 0;
272
273 case PFRT_LOG_IOC_GET_INFO:
274 info.log_level = get_pfrt_log_level(pfrt_log_dev);
275 if (ret < 0)
276 return ret;
277
278 info.log_type = pfrt_log_dev->info.log_type;
279 info.log_revid = pfrt_log_dev->info.log_revid;
280 if (copy_to_user(p, &info, sizeof(info)))
281 return -EFAULT;
282
283 return 0;
284
285 case PFRT_LOG_IOC_GET_DATA_INFO:
286 ret = get_pfrt_log_data_info(&data_info, pfrt_log_dev);
287 if (ret)
288 return ret;
289
290 if (copy_to_user(p, &data_info, sizeof(struct pfrt_log_data_info)))
291 return -EFAULT;
292
293 return 0;
294
295 default:
296 return -ENOTTY;
297 }
298}
299
300static int
301pfrt_log_mmap(struct file *file, struct vm_area_struct *vma)
302{
303 struct pfrt_log_device *pfrt_log_dev;
304 struct pfrt_log_data_info info;
305 unsigned long psize, vsize;
306 phys_addr_t base_addr;
307 int ret;
308
309 if (vma->vm_flags & VM_WRITE)
310 return -EROFS;
311
312 /* changing from read to write with mprotect is not allowed */
313 vma->vm_flags &= ~VM_MAYWRITE;
314
315 pfrt_log_dev = to_pfrt_log_dev(file);
316
317 ret = get_pfrt_log_data_info(&info, pfrt_log_dev);
318 if (ret)
319 return ret;
320
321 base_addr = (phys_addr_t)((info.chunk2_addr_hi << 32) | info.chunk2_addr_lo);
322 /* pfrt update has not been launched yet */
323 if (!base_addr)
324 return -ENODEV;
325
326 psize = info.max_data_size;
327 /* base address and total buffer size must be page aligned */
328 if (!PAGE_ALIGNED(base_addr) || !PAGE_ALIGNED(psize))
329 return -ENODEV;
330
331 vsize = vma->vm_end - vma->vm_start;
332 if (vsize > psize)
333 return -EINVAL;
334
335 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
336 if (io_remap_pfn_range(vma, vma->vm_start, PFN_DOWN(base_addr),
337 vsize, vma->vm_page_prot))
338 return -EAGAIN;
339
340 return 0;
341}
342
343static const struct file_operations acpi_pfrt_log_fops = {
344 .owner = THIS_MODULE,
345 .mmap = pfrt_log_mmap,
346 .unlocked_ioctl = pfrt_log_ioctl,
347 .llseek = noop_llseek,
348};
349
350static int acpi_pfrt_log_remove(struct platform_device *pdev)
351{
352 struct pfrt_log_device *pfrt_log_dev = platform_get_drvdata(pdev);
353
354 misc_deregister(&pfrt_log_dev->miscdev);
355
356 return 0;
357}
358
359static void pfrt_log_put_idx(void *data)
360{
361 struct pfrt_log_device *pfrt_log_dev = data;
362
363 ida_free(&pfrt_log_ida, pfrt_log_dev->index);
364}
365
366static int acpi_pfrt_log_probe(struct platform_device *pdev)
367{
368 acpi_handle handle = ACPI_HANDLE(&pdev->dev);
369 struct pfrt_log_device *pfrt_log_dev;
370 int ret;
371
372 if (!acpi_has_method(handle, "_DSM")) {
373 dev_dbg(&pdev->dev, "Missing _DSM\n");
374 return -ENODEV;
375 }
376
377 pfrt_log_dev = devm_kzalloc(&pdev->dev, sizeof(*pfrt_log_dev), GFP_KERNEL);
378 if (!pfrt_log_dev)
379 return -ENOMEM;
380
381 ret = ida_alloc(&pfrt_log_ida, GFP_KERNEL);
382 if (ret < 0)
383 return ret;
384
385 pfrt_log_dev->index = ret;
386 ret = devm_add_action_or_reset(&pdev->dev, pfrt_log_put_idx, pfrt_log_dev);
387 if (ret)
388 return ret;
389
390 pfrt_log_dev->info.log_revid = PFRT_DEFAULT_REV_ID;
391 pfrt_log_dev->parent_dev = &pdev->dev;
392
393 pfrt_log_dev->miscdev.minor = MISC_DYNAMIC_MINOR;
394 pfrt_log_dev->miscdev.name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
395 "pfrt%d",
396 pfrt_log_dev->index);
397 if (!pfrt_log_dev->miscdev.name)
398 return -ENOMEM;
399
400 pfrt_log_dev->miscdev.nodename = devm_kasprintf(&pdev->dev, GFP_KERNEL,
401 "acpi_pfr_telemetry%d",
402 pfrt_log_dev->index);
403 if (!pfrt_log_dev->miscdev.nodename)
404 return -ENOMEM;
405
406 pfrt_log_dev->miscdev.fops = &acpi_pfrt_log_fops;
407 pfrt_log_dev->miscdev.parent = &pdev->dev;
408
409 ret = misc_register(&pfrt_log_dev->miscdev);
410 if (ret)
411 return ret;
412
413 platform_set_drvdata(pdev, pfrt_log_dev);
414
415 return 0;
416}
417
418static const struct acpi_device_id acpi_pfrt_log_ids[] = {
419 {"INTC1081"},
420 {}
421};
422MODULE_DEVICE_TABLE(acpi, acpi_pfrt_log_ids);
423
424static struct platform_driver acpi_pfrt_log_driver = {
425 .driver = {
426 .name = "pfr_telemetry",
427 .acpi_match_table = acpi_pfrt_log_ids,
428 },
429 .probe = acpi_pfrt_log_probe,
430 .remove = acpi_pfrt_log_remove,
431};
432module_platform_driver(acpi_pfrt_log_driver);
433
434MODULE_DESCRIPTION("Platform Firmware Runtime Update Telemetry driver");
435MODULE_LICENSE("GPL v2");