summaryrefslogtreecommitdiffstats
path: root/drivers/platform/x86/intel/ifs/load.c
blob: 2cf3b4a8813f9b30cb5a79aaf2ee6acee2474c68 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
// SPDX-License-Identifier: GPL-2.0-only
/* Copyright(c) 2022 Intel Corporation. */

#include <linux/firmware.h>
#include <linux/sizes.h>
#include <asm/cpu.h>
#include <asm/microcode.h>

#include "ifs.h"

#define IFS_CHUNK_ALIGNMENT	256
union meta_data {
	struct {
		u32 meta_type;		// metadata type
		u32 meta_size;		// size of this entire struct including hdrs.
		u32 test_type;		// IFS test type
		u32 fusa_info;		// Fusa info
		u32 total_images;	// Total number of images
		u32 current_image;	// Current Image #
		u32 total_chunks;	// Total number of chunks in this image
		u32 starting_chunk;	// Starting chunk number in this image
		u32 size_per_chunk;	// size of each chunk
		u32 chunks_per_stride;	// number of chunks in a stride
	};
	u8 padding[IFS_CHUNK_ALIGNMENT];
};

#define IFS_HEADER_SIZE	(sizeof(struct microcode_header_intel))
#define META_TYPE_IFS	1
#define INVALIDATE_STRIDE	0x1UL
#define IFS_GEN_STRIDE_AWARE	2
#define AUTH_INTERRUPTED_ERROR	5
#define IFS_AUTH_RETRY_CT	10

static  struct microcode_header_intel *ifs_header_ptr;	/* pointer to the ifs image header */
static u64 ifs_hash_ptr;			/* Address of ifs metadata (hash) */
static u64 ifs_test_image_ptr;			/* 256B aligned address of test pattern */
static DECLARE_COMPLETION(ifs_done);

static const char * const scan_hash_status[] = {
	[0] = "No error reported",
	[1] = "Attempt to copy scan hashes when copy already in progress",
	[2] = "Secure Memory not set up correctly",
	[3] = "FuSaInfo.ProgramID does not match or ff-mm-ss does not match",
	[4] = "Reserved",
	[5] = "Integrity check failed",
	[6] = "Scan reload or test is in progress"
};

static const char * const scan_authentication_status[] = {
	[0] = "No error reported",
	[1] = "Attempt to authenticate a chunk which is already marked as authentic",
	[2] = "Chunk authentication error. The hash of chunk did not match expected value",
	[3] = "Reserved",
	[4] = "Chunk outside the current stride",
	[5] = "Authentication flow interrupted",
};

#define MC_HEADER_META_TYPE_END		(0)

struct metadata_header {
	unsigned int		type;
	unsigned int		blk_size;
};

static struct metadata_header *find_meta_data(void *ucode, unsigned int meta_type)
{
	struct microcode_header_intel *hdr = &((struct microcode_intel *)ucode)->hdr;
	struct metadata_header *meta_header;
	unsigned long data_size, total_meta;
	unsigned long meta_size = 0;

	data_size = intel_microcode_get_datasize(hdr);
	total_meta = hdr->metasize;
	if (!total_meta)
		return NULL;

	meta_header = (ucode + MC_HEADER_SIZE + data_size) - total_meta;

	while (meta_header->type != MC_HEADER_META_TYPE_END &&
	       meta_header->blk_size &&
	       meta_size < total_meta) {
		meta_size += meta_header->blk_size;
		if (meta_header->type == meta_type)
			return meta_header;

		meta_header = (void *)meta_header + meta_header->blk_size;
	}
	return NULL;
}

static void hashcopy_err_message(struct device *dev, u32 err_code)
{
	if (err_code >= ARRAY_SIZE(scan_hash_status))
		dev_err(dev, "invalid error code 0x%x for hash copy\n", err_code);
	else
		dev_err(dev, "Hash copy error : %s\n", scan_hash_status[err_code]);
}

static void auth_err_message(struct device *dev, u32 err_code)
{
	if (err_code >= ARRAY_SIZE(scan_authentication_status))
		dev_err(dev, "invalid error code 0x%x for authentication\n", err_code);
	else
		dev_err(dev, "Chunk authentication error : %s\n",
			scan_authentication_status[err_code]);
}

/*
 * To copy scan hashes and authenticate test chunks, the initiating cpu must point
 * to the EDX:EAX to the test image in linear address.
 * Run wrmsr(MSR_COPY_SCAN_HASHES) for scan hash copy and run wrmsr(MSR_AUTHENTICATE_AND_COPY_CHUNK)
 * for scan hash copy and test chunk authentication.
 */
static void copy_hashes_authenticate_chunks(struct work_struct *work)
{
	struct ifs_work *local_work = container_of(work, struct ifs_work, w);
	union ifs_scan_hashes_status hashes_status;
	union ifs_chunks_auth_status chunk_status;
	struct device *dev = local_work->dev;
	int i, num_chunks, chunk_size;
	struct ifs_data *ifsd;
	u64 linear_addr, base;
	u32 err_code;

	ifsd = ifs_get_data(dev);
	/* run scan hash copy */
	wrmsrl(MSR_COPY_SCAN_HASHES, ifs_hash_ptr);
	rdmsrl(MSR_SCAN_HASHES_STATUS, hashes_status.data);

	/* enumerate the scan image information */
	num_chunks = hashes_status.num_chunks;
	chunk_size = hashes_status.chunk_size * 1024;
	err_code = hashes_status.error_code;

	if (!hashes_status.valid) {
		ifsd->loading_error = true;
		hashcopy_err_message(dev, err_code);
		goto done;
	}

	/* base linear address to the scan data */
	base = ifs_test_image_ptr;

	/* scan data authentication and copy chunks to secured memory */
	for (i = 0; i < num_chunks; i++) {
		linear_addr = base + i * chunk_size;
		linear_addr |= i;

		wrmsrl(MSR_AUTHENTICATE_AND_COPY_CHUNK, linear_addr);
		rdmsrl(MSR_CHUNKS_AUTHENTICATION_STATUS, chunk_status.data);

		ifsd->valid_chunks = chunk_status.valid_chunks;
		err_code = chunk_status.error_code;

		if (err_code) {
			ifsd->loading_error = true;
			auth_err_message(dev, err_code);
			goto done;
		}
	}
done:
	complete(&ifs_done);
}

static int get_num_chunks(int gen, union ifs_scan_hashes_status_gen2 status)
{
	return gen >= IFS_GEN_STRIDE_AWARE ? status.chunks_in_stride : status.num_chunks;
}

static bool need_copy_scan_hashes(struct ifs_data *ifsd)
{
	return !ifsd->loaded ||
		ifsd->generation < IFS_GEN_STRIDE_AWARE ||
		ifsd->loaded_version != ifs_header_ptr->rev;
}

static int copy_hashes_authenticate_chunks_gen2(struct device *dev)
{
	union ifs_scan_hashes_status_gen2 hashes_status;
	union ifs_chunks_auth_status_gen2 chunk_status;
	u32 err_code, valid_chunks, total_chunks;
	int i, num_chunks, chunk_size;
	union meta_data *ifs_meta;
	int starting_chunk_nr;
	struct ifs_data *ifsd;
	u64 linear_addr, base;
	u64 chunk_table[2];
	int retry_count;

	ifsd = ifs_get_data(dev);

	if (need_copy_scan_hashes(ifsd)) {
		wrmsrl(MSR_COPY_SCAN_HASHES, ifs_hash_ptr);
		rdmsrl(MSR_SCAN_HASHES_STATUS, hashes_status.data);

		/* enumerate the scan image information */
		chunk_size = hashes_status.chunk_size * SZ_1K;
		err_code = hashes_status.error_code;

		num_chunks = get_num_chunks(ifsd->generation, hashes_status);

		if (!hashes_status.valid) {
			hashcopy_err_message(dev, err_code);
			return -EIO;
		}
		ifsd->loaded_version = ifs_header_ptr->rev;
		ifsd->chunk_size = chunk_size;
	} else {
		num_chunks = ifsd->valid_chunks;
		chunk_size = ifsd->chunk_size;
	}

	if (ifsd->generation >= IFS_GEN_STRIDE_AWARE) {
		wrmsrl(MSR_SAF_CTRL, INVALIDATE_STRIDE);
		rdmsrl(MSR_CHUNKS_AUTHENTICATION_STATUS, chunk_status.data);
		if (chunk_status.valid_chunks != 0) {
			dev_err(dev, "Couldn't invalidate installed stride - %d\n",
				chunk_status.valid_chunks);
			return -EIO;
		}
	}

	base = ifs_test_image_ptr;
	ifs_meta = (union meta_data *)find_meta_data(ifs_header_ptr, META_TYPE_IFS);
	starting_chunk_nr = ifs_meta->starting_chunk;

	/* scan data authentication and copy chunks to secured memory */
	for (i = 0; i < num_chunks; i++) {
		retry_count = IFS_AUTH_RETRY_CT;
		linear_addr = base + i * chunk_size;

		chunk_table[0] = starting_chunk_nr + i;
		chunk_table[1] = linear_addr;
		do {
			wrmsrl(MSR_AUTHENTICATE_AND_COPY_CHUNK, (u64)chunk_table);
			rdmsrl(MSR_CHUNKS_AUTHENTICATION_STATUS, chunk_status.data);
			err_code = chunk_status.error_code;
		} while (err_code == AUTH_INTERRUPTED_ERROR && --retry_count);

		if (err_code) {
			ifsd->loading_error = true;
			auth_err_message(dev, err_code);
			return -EIO;
		}
	}

	valid_chunks = chunk_status.valid_chunks;
	total_chunks = chunk_status.total_chunks;

	if (valid_chunks != total_chunks) {
		ifsd->loading_error = true;
		dev_err(dev, "Couldn't authenticate all the chunks. Authenticated %d total %d.\n",
			valid_chunks, total_chunks);
		return -EIO;
	}
	ifsd->valid_chunks = valid_chunks;

	return 0;
}

static int validate_ifs_metadata(struct device *dev)
{
	struct ifs_data *ifsd = ifs_get_data(dev);
	union meta_data *ifs_meta;
	char test_file[64];
	int ret = -EINVAL;

	snprintf(test_file, sizeof(test_file), "%02x-%02x-%02x-%02x.scan",
		 boot_cpu_data.x86, boot_cpu_data.x86_model,
		 boot_cpu_data.x86_stepping, ifsd->cur_batch);

	ifs_meta = (union meta_data *)find_meta_data(ifs_header_ptr, META_TYPE_IFS);
	if (!ifs_meta) {
		dev_err(dev, "IFS Metadata missing in file %s\n", test_file);
		return ret;
	}

	ifs_test_image_ptr = (u64)ifs_meta + sizeof(union meta_data);

	/* Scan chunk start must be 256 byte aligned */
	if (!IS_ALIGNED(ifs_test_image_ptr, IFS_CHUNK_ALIGNMENT)) {
		dev_err(dev, "Scan pattern is not aligned on %d bytes aligned in %s\n",
			IFS_CHUNK_ALIGNMENT, test_file);
		return ret;
	}

	if (ifs_meta->current_image != ifsd->cur_batch) {
		dev_warn(dev, "Mismatch between filename %s and batch metadata 0x%02x\n",
			 test_file, ifs_meta->current_image);
		return ret;
	}

	if (ifs_meta->chunks_per_stride &&
	    (ifs_meta->starting_chunk % ifs_meta->chunks_per_stride != 0)) {
		dev_warn(dev, "Starting chunk num %u not a multiple of chunks_per_stride %u\n",
			 ifs_meta->starting_chunk, ifs_meta->chunks_per_stride);
		return ret;
	}

	return 0;
}

/*
 * IFS requires scan chunks authenticated per each socket in the platform.
 * Once the test chunk is authenticated, it is automatically copied to secured memory
 * and proceed the authentication for the next chunk.
 */
static int scan_chunks_sanity_check(struct device *dev)
{
	struct ifs_data *ifsd = ifs_get_data(dev);
	struct ifs_work local_work;
	int curr_pkg, cpu, ret;

	memset(ifs_pkg_auth, 0, (topology_max_packages() * sizeof(bool)));
	ret = validate_ifs_metadata(dev);
	if (ret)
		return ret;

	ifsd->loading_error = false;

	if (ifsd->generation > 0)
		return copy_hashes_authenticate_chunks_gen2(dev);

	/* copy the scan hash and authenticate per package */
	cpus_read_lock();
	for_each_online_cpu(cpu) {
		curr_pkg = topology_physical_package_id(cpu);
		if (ifs_pkg_auth[curr_pkg])
			continue;
		reinit_completion(&ifs_done);
		local_work.dev = dev;
		INIT_WORK_ONSTACK(&local_work.w, copy_hashes_authenticate_chunks);
		schedule_work_on(cpu, &local_work.w);
		wait_for_completion(&ifs_done);
		if (ifsd->loading_error) {
			ret = -EIO;
			goto out;
		}
		ifs_pkg_auth[curr_pkg] = 1;
	}
	ret = 0;
	ifsd->loaded_version = ifs_header_ptr->rev;
out:
	cpus_read_unlock();

	return ret;
}

static int image_sanity_check(struct device *dev, const struct microcode_header_intel *data)
{
	struct cpu_signature sig;

	/* Provide a specific error message when loading an older/unsupported image */
	if (data->hdrver != MC_HEADER_TYPE_IFS) {
		dev_err(dev, "Header version %d not supported\n", data->hdrver);
		return -EINVAL;
	}

	if (intel_microcode_sanity_check((void *)data, true, MC_HEADER_TYPE_IFS)) {
		dev_err(dev, "sanity check failed\n");
		return -EINVAL;
	}

	intel_collect_cpu_info(&sig);

	if (!intel_find_matching_signature((void *)data, &sig)) {
		dev_err(dev, "cpu signature, processor flags not matching\n");
		return -EINVAL;
	}

	return 0;
}

/*
 * Load ifs image. Before loading ifs module, the ifs image must be located
 * in /lib/firmware/intel/ifs_x/ and named as family-model-stepping-02x.{testname}.
 */
int ifs_load_firmware(struct device *dev)
{
	const struct ifs_test_caps *test = ifs_get_test_caps(dev);
	struct ifs_data *ifsd = ifs_get_data(dev);
	unsigned int expected_size;
	const struct firmware *fw;
	char scan_path[64];
	int ret = -EINVAL;

	snprintf(scan_path, sizeof(scan_path), "intel/ifs_%d/%02x-%02x-%02x-%02x.scan",
		 test->test_num, boot_cpu_data.x86, boot_cpu_data.x86_model,
		 boot_cpu_data.x86_stepping, ifsd->cur_batch);

	ret = request_firmware_direct(&fw, scan_path, dev);
	if (ret) {
		dev_err(dev, "ifs file %s load failed\n", scan_path);
		goto done;
	}

	expected_size = ((struct microcode_header_intel *)fw->data)->totalsize;
	if (fw->size != expected_size) {
		dev_err(dev, "File size mismatch (expected %u, actual %zu). Corrupted IFS image.\n",
			expected_size, fw->size);
		ret = -EINVAL;
		goto release;
	}

	ret = image_sanity_check(dev, (struct microcode_header_intel *)fw->data);
	if (ret)
		goto release;

	ifs_header_ptr = (struct microcode_header_intel *)fw->data;
	ifs_hash_ptr = (u64)(ifs_header_ptr + 1);

	ret = scan_chunks_sanity_check(dev);
	if (ret)
		dev_err(dev, "Load failure for batch: %02x\n", ifsd->cur_batch);

release:
	release_firmware(fw);
done:
	ifsd->loaded = (ret == 0);

	return ret;
}