forked from ~ljy/RK356X_SDK_RELEASE
blame | history | patch | commit | commitdiff
hc
2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c 
 kernel/drivers/crypto/ccp/psp-dev.c
....@@ -1,53 +1,21 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * AMD Platform Security Processor (PSP) interface
34  *
4
- * Copyright (C) 2016-2017 Advanced Micro Devices, Inc.
5
+ * Copyright (C) 2016,2019 Advanced Micro Devices, Inc.
56  *
67  * Author: Brijesh Singh <brijesh.singh@amd.com>
7
- *
8
- * This program is free software; you can redistribute it and/or modify
9
- * it under the terms of the GNU General Public License version 2 as
10
- * published by the Free Software Foundation.
118  */
129 
13
-#include <linux/module.h>
1410 #include <linux/kernel.h>
15
-#include <linux/kthread.h>
16
-#include <linux/sched.h>
17
-#include <linux/interrupt.h>
18
-#include <linux/spinlock.h>
19
-#include <linux/spinlock_types.h>
20
-#include <linux/types.h>
21
-#include <linux/mutex.h>
22
-#include <linux/delay.h>
23
-#include <linux/hw_random.h>
24
-#include <linux/ccp.h>
25
-#include <linux/firmware.h>
11
+#include <linux/irqreturn.h>
2612 
2713 #include "sp-dev.h"
2814 #include "psp-dev.h"
15
+#include "sev-dev.h"
16
+#include "tee-dev.h"
2917 
30
-#define SEV_VERSION_GREATER_OR_EQUAL(_maj, _min)	\
31
-		((psp_master->api_major) >= _maj &&	\
32
-		 (psp_master->api_minor) >= _min)
33
-
34
-#define DEVICE_NAME	"sev"
35
-#define SEV_FW_FILE	"amd/sev.fw"
36
-
37
-static DEFINE_MUTEX(sev_cmd_mutex);
38
-static struct sev_misc_dev *misc_dev;
39
-static struct psp_device *psp_master;
40
-
41
-static int psp_cmd_timeout = 100;
42
-module_param(psp_cmd_timeout, int, 0644);
43
-MODULE_PARM_DESC(psp_cmd_timeout, " default timeout value, in seconds, for PSP commands");
44
-
45
-static int psp_probe_timeout = 5;
46
-module_param(psp_probe_timeout, int, 0644);
47
-MODULE_PARM_DESC(psp_probe_timeout, " default timeout value, in seconds, during PSP device probe");
48
-
49
-static bool psp_dead;
50
-static int psp_timeout;
18
+struct psp_device *psp_master;
5119 
5220 static struct psp_device *psp_alloc_struct(struct sp_device *sp)
5321 {
....@@ -70,771 +38,105 @@
7038 {
7139 	struct psp_device *psp = data;
7240 	unsigned int status;
73
-	int reg;
7441 
7542 	/* Read the interrupt status: */
7643 	status = ioread32(psp->io_regs + psp->vdata->intsts_reg);
7744 
78
-	/* Check if it is command completion: */
79
-	if (!(status & PSP_CMD_COMPLETE))
80
-		goto done;
45
+	/* invoke subdevice interrupt handlers */
46
+	if (status) {
47
+		if (psp->sev_irq_handler)
48
+			psp->sev_irq_handler(irq, psp->sev_irq_data, status);
8149 
82
-	/* Check if it is SEV command completion: */
83
-	reg = ioread32(psp->io_regs + psp->vdata->cmdresp_reg);
84
-	if (reg & PSP_CMDRESP_RESP) {
85
-		psp->sev_int_rcvd = 1;
86
-		wake_up(&psp->sev_int_queue);
50
+		if (psp->tee_irq_handler)
51
+			psp->tee_irq_handler(irq, psp->tee_irq_data, status);
8752 	}
8853 
89
-done:
9054 	/* Clear the interrupt status by writing the same value we read. */
9155 	iowrite32(status, psp->io_regs + psp->vdata->intsts_reg);
9256 
9357 	return IRQ_HANDLED;
9458 }
9559 
96
-static int sev_wait_cmd_ioc(struct psp_device *psp,
97
-			    unsigned int *reg, unsigned int timeout)
60
+static unsigned int psp_get_capability(struct psp_device *psp)
9861 {
99
-	int ret;
62
+	unsigned int val = ioread32(psp->io_regs + psp->vdata->feature_reg);
10063 
101
-	ret = wait_event_timeout(psp->sev_int_queue,
102
-			psp->sev_int_rcvd, timeout * HZ);
103
-	if (!ret)
104
-		return -ETIMEDOUT;
105
-
106
-	*reg = ioread32(psp->io_regs + psp->vdata->cmdresp_reg);
107
-
108
-	return 0;
109
-}
110
-
111
-static int sev_cmd_buffer_len(int cmd)
112
-{
113
-	switch (cmd) {
114
-	case SEV_CMD_INIT:			return sizeof(struct sev_data_init);
115
-	case SEV_CMD_PLATFORM_STATUS:		return sizeof(struct sev_user_data_status);
116
-	case SEV_CMD_PEK_CSR:			return sizeof(struct sev_data_pek_csr);
117
-	case SEV_CMD_PEK_CERT_IMPORT:		return sizeof(struct sev_data_pek_cert_import);
118
-	case SEV_CMD_PDH_CERT_EXPORT:		return sizeof(struct sev_data_pdh_cert_export);
119
-	case SEV_CMD_LAUNCH_START:		return sizeof(struct sev_data_launch_start);
120
-	case SEV_CMD_LAUNCH_UPDATE_DATA:	return sizeof(struct sev_data_launch_update_data);
121
-	case SEV_CMD_LAUNCH_UPDATE_VMSA:	return sizeof(struct sev_data_launch_update_vmsa);
122
-	case SEV_CMD_LAUNCH_FINISH:		return sizeof(struct sev_data_launch_finish);
123
-	case SEV_CMD_LAUNCH_MEASURE:		return sizeof(struct sev_data_launch_measure);
124
-	case SEV_CMD_ACTIVATE:			return sizeof(struct sev_data_activate);
125
-	case SEV_CMD_DEACTIVATE:		return sizeof(struct sev_data_deactivate);
126
-	case SEV_CMD_DECOMMISSION:		return sizeof(struct sev_data_decommission);
127
-	case SEV_CMD_GUEST_STATUS:		return sizeof(struct sev_data_guest_status);
128
-	case SEV_CMD_DBG_DECRYPT:		return sizeof(struct sev_data_dbg);
129
-	case SEV_CMD_DBG_ENCRYPT:		return sizeof(struct sev_data_dbg);
130
-	case SEV_CMD_SEND_START:		return sizeof(struct sev_data_send_start);
131
-	case SEV_CMD_SEND_UPDATE_DATA:		return sizeof(struct sev_data_send_update_data);
132
-	case SEV_CMD_SEND_UPDATE_VMSA:		return sizeof(struct sev_data_send_update_vmsa);
133
-	case SEV_CMD_SEND_FINISH:		return sizeof(struct sev_data_send_finish);
134
-	case SEV_CMD_RECEIVE_START:		return sizeof(struct sev_data_receive_start);
135
-	case SEV_CMD_RECEIVE_FINISH:		return sizeof(struct sev_data_receive_finish);
136
-	case SEV_CMD_RECEIVE_UPDATE_DATA:	return sizeof(struct sev_data_receive_update_data);
137
-	case SEV_CMD_RECEIVE_UPDATE_VMSA:	return sizeof(struct sev_data_receive_update_vmsa);
138
-	case SEV_CMD_LAUNCH_UPDATE_SECRET:	return sizeof(struct sev_data_launch_secret);
139
-	case SEV_CMD_DOWNLOAD_FIRMWARE:		return sizeof(struct sev_data_download_firmware);
140
-	case SEV_CMD_GET_ID:			return sizeof(struct sev_data_get_id);
141
-	default:				return 0;
142
-	}
143
-
144
-	return 0;
145
-}
146
-
147
-static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret)
148
-{
149
-	struct psp_device *psp = psp_master;
150
-	unsigned int phys_lsb, phys_msb;
151
-	unsigned int reg, ret = 0;
152
-
153
-	if (!psp)
154
-		return -ENODEV;
155
-
156
-	if (psp_dead)
157
-		return -EBUSY;
158
-
159
-	/* Get the physical address of the command buffer */
160
-	phys_lsb = data ? lower_32_bits(__psp_pa(data)) : 0;
161
-	phys_msb = data ? upper_32_bits(__psp_pa(data)) : 0;
162
-
163
-	dev_dbg(psp->dev, "sev command id %#x buffer 0x%08x%08x timeout %us\n",
164
-		cmd, phys_msb, phys_lsb, psp_timeout);
165
-
166
-	print_hex_dump_debug("(in):  ", DUMP_PREFIX_OFFSET, 16, 2, data,
167
-			     sev_cmd_buffer_len(cmd), false);
168
-
169
-	iowrite32(phys_lsb, psp->io_regs + psp->vdata->cmdbuff_addr_lo_reg);
170
-	iowrite32(phys_msb, psp->io_regs + psp->vdata->cmdbuff_addr_hi_reg);
171
-
172
-	psp->sev_int_rcvd = 0;
173
-
174
-	reg = cmd;
175
-	reg <<= PSP_CMDRESP_CMD_SHIFT;
176
-	reg |= PSP_CMDRESP_IOC;
177
-	iowrite32(reg, psp->io_regs + psp->vdata->cmdresp_reg);
178
-
179
-	/* wait for command completion */
180
-	ret = sev_wait_cmd_ioc(psp, &reg, psp_timeout);
181
-	if (ret) {
182
-		if (psp_ret)
183
-			*psp_ret = 0;
184
-
185
-		dev_err(psp->dev, "sev command %#x timed out, disabling PSP \n", cmd);
186
-		psp_dead = true;
187
-
188
-		return ret;
189
-	}
190
-
191
-	psp_timeout = psp_cmd_timeout;
192
-
193
-	if (psp_ret)
194
-		*psp_ret = reg & PSP_CMDRESP_ERR_MASK;
195
-
196
-	if (reg & PSP_CMDRESP_ERR_MASK) {
197
-		dev_dbg(psp->dev, "sev command %#x failed (%#010x)\n",
198
-			cmd, reg & PSP_CMDRESP_ERR_MASK);
199
-		ret = -EIO;
200
-	}
201
-
202
-	print_hex_dump_debug("(out): ", DUMP_PREFIX_OFFSET, 16, 2, data,
203
-			     sev_cmd_buffer_len(cmd), false);
204
-
205
-	return ret;
206
-}
207
-
208
-static int sev_do_cmd(int cmd, void *data, int *psp_ret)
209
-{
210
-	int rc;
211
-
212
-	mutex_lock(&sev_cmd_mutex);
213
-	rc = __sev_do_cmd_locked(cmd, data, psp_ret);
214
-	mutex_unlock(&sev_cmd_mutex);
215
-
216
-	return rc;
217
-}
218
-
219
-static int __sev_platform_init_locked(int *error)
220
-{
221
-	struct psp_device *psp = psp_master;
222
-	int rc = 0;
223
-
224
-	if (!psp)
225
-		return -ENODEV;
226
-
227
-	if (psp->sev_state == SEV_STATE_INIT)
64
+	/*
65
+	 * Check for a access to the registers.  If this read returns
66
+	 * 0xffffffff, it's likely that the system is running a broken
67
+	 * BIOS which disallows access to the device. Stop here and
68
+	 * fail the PSP initialization (but not the load, as the CCP
69
+	 * could get properly initialized).
70
+	 */
71
+	if (val == 0xffffffff) {
72
+		dev_notice(psp->dev, "psp: unable to access the device: you might be running a broken BIOS.\n");
22873 		return 0;
229
-
230
-	rc = __sev_do_cmd_locked(SEV_CMD_INIT, &psp->init_cmd_buf, error);
231
-	if (rc)
232
-		return rc;
233
-
234
-	psp->sev_state = SEV_STATE_INIT;
235
-	dev_dbg(psp->dev, "SEV firmware initialized\n");
236
-
237
-	return rc;
238
-}
239
-
240
-int sev_platform_init(int *error)
241
-{
242
-	int rc;
243
-
244
-	mutex_lock(&sev_cmd_mutex);
245
-	rc = __sev_platform_init_locked(error);
246
-	mutex_unlock(&sev_cmd_mutex);
247
-
248
-	return rc;
249
-}
250
-EXPORT_SYMBOL_GPL(sev_platform_init);
251
-
252
-static int __sev_platform_shutdown_locked(int *error)
253
-{
254
-	int ret;
255
-
256
-	ret = __sev_do_cmd_locked(SEV_CMD_SHUTDOWN, NULL, error);
257
-	if (ret)
258
-		return ret;
259
-
260
-	psp_master->sev_state = SEV_STATE_UNINIT;
261
-	dev_dbg(psp_master->dev, "SEV firmware shutdown\n");
262
-
263
-	return ret;
264
-}
265
-
266
-static int sev_platform_shutdown(int *error)
267
-{
268
-	int rc;
269
-
270
-	mutex_lock(&sev_cmd_mutex);
271
-	rc = __sev_platform_shutdown_locked(NULL);
272
-	mutex_unlock(&sev_cmd_mutex);
273
-
274
-	return rc;
275
-}
276
-
277
-static int sev_get_platform_state(int *state, int *error)
278
-{
279
-	int rc;
280
-
281
-	rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS,
282
-				 &psp_master->status_cmd_buf, error);
283
-	if (rc)
284
-		return rc;
285
-
286
-	*state = psp_master->status_cmd_buf.state;
287
-	return rc;
288
-}
289
-
290
-static int sev_ioctl_do_reset(struct sev_issue_cmd *argp)
291
-{
292
-	int state, rc;
293
-
294
-	/*
295
-	 * The SEV spec requires that FACTORY_RESET must be issued in
296
-	 * UNINIT state. Before we go further lets check if any guest is
297
-	 * active.
298
-	 *
299
-	 * If FW is in WORKING state then deny the request otherwise issue
300
-	 * SHUTDOWN command do INIT -> UNINIT before issuing the FACTORY_RESET.
301
-	 *
302
-	 */
303
-	rc = sev_get_platform_state(&state, &argp->error);
304
-	if (rc)
305
-		return rc;
306
-
307
-	if (state == SEV_STATE_WORKING)
308
-		return -EBUSY;
309
-
310
-	if (state == SEV_STATE_INIT) {
311
-		rc = __sev_platform_shutdown_locked(&argp->error);
312
-		if (rc)
313
-			return rc;
31474 	}
31575 
316
-	return __sev_do_cmd_locked(SEV_CMD_FACTORY_RESET, NULL, &argp->error);
76
+	return val;
31777 }
31878 
319
-static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp)
320
-{
321
-	struct sev_user_data_status *data = &psp_master->status_cmd_buf;
322
-	int ret;
323
-
324
-	ret = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, data, &argp->error);
325
-	if (ret)
326
-		return ret;
327
-
328
-	if (copy_to_user((void __user *)argp->data, data, sizeof(*data)))
329
-		ret = -EFAULT;
330
-
331
-	return ret;
332
-}
333
-
334
-static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp)
335
-{
336
-	int rc;
337
-
338
-	if (psp_master->sev_state == SEV_STATE_UNINIT) {
339
-		rc = __sev_platform_init_locked(&argp->error);
340
-		if (rc)
341
-			return rc;
342
-	}
343
-
344
-	return __sev_do_cmd_locked(cmd, NULL, &argp->error);
345
-}
346
-
347
-static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp)
348
-{
349
-	struct sev_user_data_pek_csr input;
350
-	struct sev_data_pek_csr *data;
351
-	void *blob = NULL;
352
-	int ret;
353
-
354
-	if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
355
-		return -EFAULT;
356
-
357
-	data = kzalloc(sizeof(*data), GFP_KERNEL);
358
-	if (!data)
359
-		return -ENOMEM;
360
-
361
-	/* userspace wants to query CSR length */
362
-	if (!input.address || !input.length)
363
-		goto cmd;
364
-
365
-	/* allocate a physically contiguous buffer to store the CSR blob */
366
-	if (!access_ok(VERIFY_WRITE, input.address, input.length) ||
367
-	    input.length > SEV_FW_BLOB_MAX_SIZE) {
368
-		ret = -EFAULT;
369
-		goto e_free;
370
-	}
371
-
372
-	blob = kmalloc(input.length, GFP_KERNEL);
373
-	if (!blob) {
374
-		ret = -ENOMEM;
375
-		goto e_free;
376
-	}
377
-
378
-	data->address = __psp_pa(blob);
379
-	data->len = input.length;
380
-
381
-cmd:
382
-	if (psp_master->sev_state == SEV_STATE_UNINIT) {
383
-		ret = __sev_platform_init_locked(&argp->error);
384
-		if (ret)
385
-			goto e_free_blob;
386
-	}
387
-
388
-	ret = __sev_do_cmd_locked(SEV_CMD_PEK_CSR, data, &argp->error);
389
-
390
-	 /* If we query the CSR length, FW responded with expected data. */
391
-	input.length = data->len;
392
-
393
-	if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
394
-		ret = -EFAULT;
395
-		goto e_free_blob;
396
-	}
397
-
398
-	if (blob) {
399
-		if (copy_to_user((void __user *)input.address, blob, input.length))
400
-			ret = -EFAULT;
401
-	}
402
-
403
-e_free_blob:
404
-	kfree(blob);
405
-e_free:
406
-	kfree(data);
407
-	return ret;
408
-}
409
-
410
-void *psp_copy_user_blob(u64 __user uaddr, u32 len)
411
-{
412
-	if (!uaddr || !len)
413
-		return ERR_PTR(-EINVAL);
414
-
415
-	/* verify that blob length does not exceed our limit */
416
-	if (len > SEV_FW_BLOB_MAX_SIZE)
417
-		return ERR_PTR(-EINVAL);
418
-
419
-	return memdup_user((void __user *)(uintptr_t)uaddr, len);
420
-}
421
-EXPORT_SYMBOL_GPL(psp_copy_user_blob);
422
-
423
-static int sev_get_api_version(void)
424
-{
425
-	struct sev_user_data_status *status;
426
-	int error, ret;
427
-
428
-	status = &psp_master->status_cmd_buf;
429
-	ret = sev_platform_status(status, &error);
430
-	if (ret) {
431
-		dev_err(psp_master->dev,
432
-			"SEV: failed to get status. Error: %#x\n", error);
433
-		return 1;
434
-	}
435
-
436
-	psp_master->api_major = status->api_major;
437
-	psp_master->api_minor = status->api_minor;
438
-	psp_master->build = status->build;
439
-
440
-	return 0;
441
-}
442
-
443
-/* Don't fail if SEV FW couldn't be updated. Continue with existing SEV FW */
444
-static int sev_update_firmware(struct device *dev)
445
-{
446
-	struct sev_data_download_firmware *data;
447
-	const struct firmware *firmware;
448
-	int ret, error, order;
449
-	struct page *p;
450
-	u64 data_size;
451
-
452
-	ret = request_firmware(&firmware, SEV_FW_FILE, dev);
453
-	if (ret < 0)
454
-		return -1;
455
-
456
-	/*
457
-	 * SEV FW expects the physical address given to it to be 32
458
-	 * byte aligned. Memory allocated has structure placed at the
459
-	 * beginning followed by the firmware being passed to the SEV
460
-	 * FW. Allocate enough memory for data structure + alignment
461
-	 * padding + SEV FW.
462
-	 */
463
-	data_size = ALIGN(sizeof(struct sev_data_download_firmware), 32);
464
-
465
-	order = get_order(firmware->size + data_size);
466
-	p = alloc_pages(GFP_KERNEL, order);
467
-	if (!p) {
468
-		ret = -1;
469
-		goto fw_err;
470
-	}
471
-
472
-	/*
473
-	 * Copy firmware data to a kernel allocated contiguous
474
-	 * memory region.
475
-	 */
476
-	data = page_address(p);
477
-	memcpy(page_address(p) + data_size, firmware->data, firmware->size);
478
-
479
-	data->address = __psp_pa(page_address(p) + data_size);
480
-	data->len = firmware->size;
481
-
482
-	ret = sev_do_cmd(SEV_CMD_DOWNLOAD_FIRMWARE, data, &error);
483
-	if (ret)
484
-		dev_dbg(dev, "Failed to update SEV firmware: %#x\n", error);
485
-	else
486
-		dev_info(dev, "SEV firmware update successful\n");
487
-
488
-	__free_pages(p, order);
489
-
490
-fw_err:
491
-	release_firmware(firmware);
492
-
493
-	return ret;
494
-}
495
-
496
-static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp)
497
-{
498
-	struct sev_user_data_pek_cert_import input;
499
-	struct sev_data_pek_cert_import *data;
500
-	void *pek_blob, *oca_blob;
501
-	int ret;
502
-
503
-	if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
504
-		return -EFAULT;
505
-
506
-	data = kzalloc(sizeof(*data), GFP_KERNEL);
507
-	if (!data)
508
-		return -ENOMEM;
509
-
510
-	/* copy PEK certificate blobs from userspace */
511
-	pek_blob = psp_copy_user_blob(input.pek_cert_address, input.pek_cert_len);
512
-	if (IS_ERR(pek_blob)) {
513
-		ret = PTR_ERR(pek_blob);
514
-		goto e_free;
515
-	}
516
-
517
-	data->pek_cert_address = __psp_pa(pek_blob);
518
-	data->pek_cert_len = input.pek_cert_len;
519
-
520
-	/* copy PEK certificate blobs from userspace */
521
-	oca_blob = psp_copy_user_blob(input.oca_cert_address, input.oca_cert_len);
522
-	if (IS_ERR(oca_blob)) {
523
-		ret = PTR_ERR(oca_blob);
524
-		goto e_free_pek;
525
-	}
526
-
527
-	data->oca_cert_address = __psp_pa(oca_blob);
528
-	data->oca_cert_len = input.oca_cert_len;
529
-
530
-	/* If platform is not in INIT state then transition it to INIT */
531
-	if (psp_master->sev_state != SEV_STATE_INIT) {
532
-		ret = __sev_platform_init_locked(&argp->error);
533
-		if (ret)
534
-			goto e_free_oca;
535
-	}
536
-
537
-	ret = __sev_do_cmd_locked(SEV_CMD_PEK_CERT_IMPORT, data, &argp->error);
538
-
539
-e_free_oca:
540
-	kfree(oca_blob);
541
-e_free_pek:
542
-	kfree(pek_blob);
543
-e_free:
544
-	kfree(data);
545
-	return ret;
546
-}
547
-
548
-static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp)
549
-{
550
-	struct sev_data_get_id *data;
551
-	u64 data_size, user_size;
552
-	void *id_blob, *mem;
553
-	int ret;
554
-
555
-	/* SEV GET_ID available from SEV API v0.16 and up */
556
-	if (!SEV_VERSION_GREATER_OR_EQUAL(0, 16))
557
-		return -ENOTSUPP;
558
-
559
-	/* SEV FW expects the buffer it fills with the ID to be
560
-	 * 8-byte aligned. Memory allocated should be enough to
561
-	 * hold data structure + alignment padding + memory
562
-	 * where SEV FW writes the ID.
563
-	 */
564
-	data_size = ALIGN(sizeof(struct sev_data_get_id), 8);
565
-	user_size = sizeof(struct sev_user_data_get_id);
566
-
567
-	mem = kzalloc(data_size + user_size, GFP_KERNEL);
568
-	if (!mem)
569
-		return -ENOMEM;
570
-
571
-	data = mem;
572
-	id_blob = mem + data_size;
573
-
574
-	data->address = __psp_pa(id_blob);
575
-	data->len = user_size;
576
-
577
-	ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error);
578
-	if (!ret) {
579
-		if (copy_to_user((void __user *)argp->data, id_blob, data->len))
580
-			ret = -EFAULT;
581
-	}
582
-
583
-	kfree(mem);
584
-
585
-	return ret;
586
-}
587
-
588
-static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp)
589
-{
590
-	struct sev_user_data_pdh_cert_export input;
591
-	void *pdh_blob = NULL, *cert_blob = NULL;
592
-	struct sev_data_pdh_cert_export *data;
593
-	int ret;
594
-
595
-	if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
596
-		return -EFAULT;
597
-
598
-	data = kzalloc(sizeof(*data), GFP_KERNEL);
599
-	if (!data)
600
-		return -ENOMEM;
601
-
602
-	/* Userspace wants to query the certificate length. */
603
-	if (!input.pdh_cert_address ||
604
-	    !input.pdh_cert_len ||
605
-	    !input.cert_chain_address)
606
-		goto cmd;
607
-
608
-	/* Allocate a physically contiguous buffer to store the PDH blob. */
609
-	if ((input.pdh_cert_len > SEV_FW_BLOB_MAX_SIZE) ||
610
-	    !access_ok(VERIFY_WRITE, input.pdh_cert_address, input.pdh_cert_len)) {
611
-		ret = -EFAULT;
612
-		goto e_free;
613
-	}
614
-
615
-	/* Allocate a physically contiguous buffer to store the cert chain blob. */
616
-	if ((input.cert_chain_len > SEV_FW_BLOB_MAX_SIZE) ||
617
-	    !access_ok(VERIFY_WRITE, input.cert_chain_address, input.cert_chain_len)) {
618
-		ret = -EFAULT;
619
-		goto e_free;
620
-	}
621
-
622
-	pdh_blob = kmalloc(input.pdh_cert_len, GFP_KERNEL);
623
-	if (!pdh_blob) {
624
-		ret = -ENOMEM;
625
-		goto e_free;
626
-	}
627
-
628
-	data->pdh_cert_address = __psp_pa(pdh_blob);
629
-	data->pdh_cert_len = input.pdh_cert_len;
630
-
631
-	cert_blob = kmalloc(input.cert_chain_len, GFP_KERNEL);
632
-	if (!cert_blob) {
633
-		ret = -ENOMEM;
634
-		goto e_free_pdh;
635
-	}
636
-
637
-	data->cert_chain_address = __psp_pa(cert_blob);
638
-	data->cert_chain_len = input.cert_chain_len;
639
-
640
-cmd:
641
-	/* If platform is not in INIT state then transition it to INIT. */
642
-	if (psp_master->sev_state != SEV_STATE_INIT) {
643
-		ret = __sev_platform_init_locked(&argp->error);
644
-		if (ret)
645
-			goto e_free_cert;
646
-	}
647
-
648
-	ret = __sev_do_cmd_locked(SEV_CMD_PDH_CERT_EXPORT, data, &argp->error);
649
-
650
-	/* If we query the length, FW responded with expected data. */
651
-	input.cert_chain_len = data->cert_chain_len;
652
-	input.pdh_cert_len = data->pdh_cert_len;
653
-
654
-	if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
655
-		ret = -EFAULT;
656
-		goto e_free_cert;
657
-	}
658
-
659
-	if (pdh_blob) {
660
-		if (copy_to_user((void __user *)input.pdh_cert_address,
661
-				 pdh_blob, input.pdh_cert_len)) {
662
-			ret = -EFAULT;
663
-			goto e_free_cert;
664
-		}
665
-	}
666
-
667
-	if (cert_blob) {
668
-		if (copy_to_user((void __user *)input.cert_chain_address,
669
-				 cert_blob, input.cert_chain_len))
670
-			ret = -EFAULT;
671
-	}
672
-
673
-e_free_cert:
674
-	kfree(cert_blob);
675
-e_free_pdh:
676
-	kfree(pdh_blob);
677
-e_free:
678
-	kfree(data);
679
-	return ret;
680
-}
681
-
682
-static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
683
-{
684
-	void __user *argp = (void __user *)arg;
685
-	struct sev_issue_cmd input;
686
-	int ret = -EFAULT;
687
-
688
-	if (!psp_master)
689
-		return -ENODEV;
690
-
691
-	if (ioctl != SEV_ISSUE_CMD)
692
-		return -EINVAL;
693
-
694
-	if (copy_from_user(&input, argp, sizeof(struct sev_issue_cmd)))
695
-		return -EFAULT;
696
-
697
-	if (input.cmd > SEV_MAX)
698
-		return -EINVAL;
699
-
700
-	mutex_lock(&sev_cmd_mutex);
701
-
702
-	switch (input.cmd) {
703
-
704
-	case SEV_FACTORY_RESET:
705
-		ret = sev_ioctl_do_reset(&input);
706
-		break;
707
-	case SEV_PLATFORM_STATUS:
708
-		ret = sev_ioctl_do_platform_status(&input);
709
-		break;
710
-	case SEV_PEK_GEN:
711
-		ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PEK_GEN, &input);
712
-		break;
713
-	case SEV_PDH_GEN:
714
-		ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PDH_GEN, &input);
715
-		break;
716
-	case SEV_PEK_CSR:
717
-		ret = sev_ioctl_do_pek_csr(&input);
718
-		break;
719
-	case SEV_PEK_CERT_IMPORT:
720
-		ret = sev_ioctl_do_pek_import(&input);
721
-		break;
722
-	case SEV_PDH_CERT_EXPORT:
723
-		ret = sev_ioctl_do_pdh_export(&input);
724
-		break;
725
-	case SEV_GET_ID:
726
-		ret = sev_ioctl_do_get_id(&input);
727
-		break;
728
-	default:
729
-		ret = -EINVAL;
730
-		goto out;
731
-	}
732
-
733
-	if (copy_to_user(argp, &input, sizeof(struct sev_issue_cmd)))
734
-		ret = -EFAULT;
735
-out:
736
-	mutex_unlock(&sev_cmd_mutex);
737
-
738
-	return ret;
739
-}
740
-
741
-static const struct file_operations sev_fops = {
742
-	.owner	= THIS_MODULE,
743
-	.unlocked_ioctl = sev_ioctl,
744
-};
745
-
746
-int sev_platform_status(struct sev_user_data_status *data, int *error)
747
-{
748
-	return sev_do_cmd(SEV_CMD_PLATFORM_STATUS, data, error);
749
-}
750
-EXPORT_SYMBOL_GPL(sev_platform_status);
751
-
752
-int sev_guest_deactivate(struct sev_data_deactivate *data, int *error)
753
-{
754
-	return sev_do_cmd(SEV_CMD_DEACTIVATE, data, error);
755
-}
756
-EXPORT_SYMBOL_GPL(sev_guest_deactivate);
757
-
758
-int sev_guest_activate(struct sev_data_activate *data, int *error)
759
-{
760
-	return sev_do_cmd(SEV_CMD_ACTIVATE, data, error);
761
-}
762
-EXPORT_SYMBOL_GPL(sev_guest_activate);
763
-
764
-int sev_guest_decommission(struct sev_data_decommission *data, int *error)
765
-{
766
-	return sev_do_cmd(SEV_CMD_DECOMMISSION, data, error);
767
-}
768
-EXPORT_SYMBOL_GPL(sev_guest_decommission);
769
-
770
-int sev_guest_df_flush(int *error)
771
-{
772
-	return sev_do_cmd(SEV_CMD_DF_FLUSH, NULL, error);
773
-}
774
-EXPORT_SYMBOL_GPL(sev_guest_df_flush);
775
-
776
-static void sev_exit(struct kref *ref)
777
-{
778
-	struct sev_misc_dev *misc_dev = container_of(ref, struct sev_misc_dev, refcount);
779
-
780
-	misc_deregister(&misc_dev->misc);
781
-}
782
-
783
-static int sev_misc_init(struct psp_device *psp)
784
-{
785
-	struct device *dev = psp->dev;
786
-	int ret;
787
-
788
-	/*
789
-	 * SEV feature support can be detected on multiple devices but the SEV
790
-	 * FW commands must be issued on the master. During probe, we do not
791
-	 * know the master hence we create /dev/sev on the first device probe.
792
-	 * sev_do_cmd() finds the right master device to which to issue the
793
-	 * command to the firmware.
794
-	 */
795
-	if (!misc_dev) {
796
-		struct miscdevice *misc;
797
-
798
-		misc_dev = devm_kzalloc(dev, sizeof(*misc_dev), GFP_KERNEL);
799
-		if (!misc_dev)
800
-			return -ENOMEM;
801
-
802
-		misc = &misc_dev->misc;
803
-		misc->minor = MISC_DYNAMIC_MINOR;
804
-		misc->name = DEVICE_NAME;
805
-		misc->fops = &sev_fops;
806
-
807
-		ret = misc_register(misc);
808
-		if (ret)
809
-			return ret;
810
-
811
-		kref_init(&misc_dev->refcount);
812
-	} else {
813
-		kref_get(&misc_dev->refcount);
814
-	}
815
-
816
-	init_waitqueue_head(&psp->sev_int_queue);
817
-	psp->sev_misc = misc_dev;
818
-	dev_dbg(dev, "registered SEV device\n");
819
-
820
-	return 0;
821
-}
822
-
823
-static int sev_init(struct psp_device *psp)
79
+static int psp_check_sev_support(struct psp_device *psp,
80
+				 unsigned int capability)
82481 {
82582 	/* Check if device supports SEV feature */
826
-	if (!(ioread32(psp->io_regs + psp->vdata->feature_reg) & 1)) {
827
-		dev_dbg(psp->dev, "device does not support SEV\n");
828
-		return 1;
83
+	if (!(capability & 1)) {
84
+		dev_dbg(psp->dev, "psp does not support SEV\n");
85
+		return -ENODEV;
82986 	}
83087 
831
-	return sev_misc_init(psp);
88
+	return 0;
89
+}
90
+
91
+static int psp_check_tee_support(struct psp_device *psp,
92
+				 unsigned int capability)
93
+{
94
+	/* Check if device supports TEE feature */
95
+	if (!(capability & 2)) {
96
+		dev_dbg(psp->dev, "psp does not support TEE\n");
97
+		return -ENODEV;
98
+	}
99
+
100
+	return 0;
101
+}
102
+
103
+static int psp_check_support(struct psp_device *psp,
104
+			     unsigned int capability)
105
+{
106
+	int sev_support = psp_check_sev_support(psp, capability);
107
+	int tee_support = psp_check_tee_support(psp, capability);
108
+
109
+	/* Return error if device neither supports SEV nor TEE */
110
+	if (sev_support && tee_support)
111
+		return -ENODEV;
112
+
113
+	return 0;
114
+}
115
+
116
+static int psp_init(struct psp_device *psp, unsigned int capability)
117
+{
118
+	int ret;
119
+
120
+	if (!psp_check_sev_support(psp, capability)) {
121
+		ret = sev_dev_init(psp);
122
+		if (ret)
123
+			return ret;
124
+	}
125
+
126
+	if (!psp_check_tee_support(psp, capability)) {
127
+		ret = tee_dev_init(psp);
128
+		if (ret)
129
+			return ret;
130
+	}
131
+
132
+	return 0;
832133 }
833134 
834135 int psp_dev_init(struct sp_device *sp)
835136 {
836137 	struct device *dev = sp->dev;
837138 	struct psp_device *psp;
139
+	unsigned int capability;
838140 	int ret;
839141 
840142 	ret = -ENOMEM;
....@@ -853,6 +155,14 @@
853155 
854156 	psp->io_regs = sp->io_map;
855157 
158
+	capability = psp_get_capability(psp);
159
+	if (!capability)
160
+		goto e_disable;
161
+
162
+	ret = psp_check_support(psp, capability);
163
+	if (ret)
164
+		goto e_disable;
165
+
856166 	/* Disable and clear interrupts until ready */
857167 	iowrite32(0, psp->io_regs + psp->vdata->inten_reg);
858168 	iowrite32(-1, psp->io_regs + psp->vdata->intsts_reg);
....@@ -864,7 +174,7 @@
864174 		goto e_err;
865175 	}
866176 
867
-	ret = sev_init(psp);
177
+	ret = psp_init(psp, capability);
868178 	if (ret)
869179 		goto e_irq;
870180 
....@@ -886,6 +196,11 @@
886196 	dev_notice(dev, "psp initialization failed\n");
887197 
888198 	return ret;
199
+
200
+e_disable:
201
+	sp->psp_data = NULL;
202
+
203
+	return ret;
889204 }
890205 
891206 void psp_dev_destroy(struct sp_device *sp)
....@@ -895,56 +210,55 @@
895210 	if (!psp)
896211 		return;
897212 
898
-	if (psp->sev_misc)
899
-		kref_put(&misc_dev->refcount, sev_exit);
213
+	sev_dev_destroy(psp);
214
+
215
+	tee_dev_destroy(psp);
900216 
901217 	sp_free_psp_irq(sp, psp);
218
+
219
+	if (sp->clear_psp_master_device)
220
+		sp->clear_psp_master_device(sp);
902221 }
903222 
904
-int sev_issue_cmd_external_user(struct file *filep, unsigned int cmd,
905
-				void *data, int *error)
223
+void psp_set_sev_irq_handler(struct psp_device *psp, psp_irq_handler_t handler,
224
+			     void *data)
906225 {
907
-	if (!filep || filep->f_op != &sev_fops)
908
-		return -EBADF;
909
-
910
-	return  sev_do_cmd(cmd, data, error);
226
+	psp->sev_irq_data = data;
227
+	psp->sev_irq_handler = handler;
911228 }
912
-EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user);
229
+
230
+void psp_clear_sev_irq_handler(struct psp_device *psp)
231
+{
232
+	psp_set_sev_irq_handler(psp, NULL, NULL);
233
+}
234
+
235
+void psp_set_tee_irq_handler(struct psp_device *psp, psp_irq_handler_t handler,
236
+			     void *data)
237
+{
238
+	psp->tee_irq_data = data;
239
+	psp->tee_irq_handler = handler;
240
+}
241
+
242
+void psp_clear_tee_irq_handler(struct psp_device *psp)
243
+{
244
+	psp_set_tee_irq_handler(psp, NULL, NULL);
245
+}
246
+
247
+struct psp_device *psp_get_master_device(void)
248
+{
249
+	struct sp_device *sp = sp_get_psp_master_device();
250
+
251
+	return sp ? sp->psp_data : NULL;
252
+}
913253 
914254 void psp_pci_init(void)
915255 {
916
-	struct sp_device *sp;
917
-	int error, rc;
256
+	psp_master = psp_get_master_device();
918257 
919
-	sp = sp_get_psp_master_device();
920
-	if (!sp)
258
+	if (!psp_master)
921259 		return;
922260 
923
-	psp_master = sp->psp_data;
924
-
925
-	psp_timeout = psp_probe_timeout;
926
-
927
-	if (sev_get_api_version())
928
-		goto err;
929
-
930
-	if (SEV_VERSION_GREATER_OR_EQUAL(0, 15) &&
931
-	    sev_update_firmware(psp_master->dev) == 0)
932
-		sev_get_api_version();
933
-
934
-	/* Initialize the platform */
935
-	rc = sev_platform_init(&error);
936
-	if (rc) {
937
-		dev_err(sp->dev, "SEV: failed to INIT error %#x\n", error);
938
-		return;
939
-	}
940
-
941
-	dev_info(sp->dev, "SEV API:%d.%d build:%d\n", psp_master->api_major,
942
-		 psp_master->api_minor, psp_master->build);
943
-
944
-	return;
945
-
946
-err:
947
-	psp_master = NULL;
261
+	sev_pci_init();
948262 }
949263 
950264 void psp_pci_exit(void)
....@@ -952,5 +266,5 @@
952266 	if (!psp_master)
953267 		return;
954268 
955
-	sev_platform_shutdown(NULL);
269
+	sev_pci_exit();
956270 }