1 // SPDX-License-Identifier: GPL-2.0-only
3 * AMD Platform Security Processor (PSP) interface
5 * Copyright (C) 2016,2018 Advanced Micro Devices, Inc.
7 * Author: Brijesh Singh <brijesh.singh@amd.com>
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/kthread.h>
13 #include <linux/sched.h>
14 #include <linux/interrupt.h>
15 #include <linux/spinlock.h>
16 #include <linux/spinlock_types.h>
17 #include <linux/types.h>
18 #include <linux/mutex.h>
19 #include <linux/delay.h>
20 #include <linux/hw_random.h>
21 #include <linux/ccp.h>
22 #include <linux/firmware.h>
27 #define SEV_VERSION_GREATER_OR_EQUAL(_maj, _min) \
28 ((psp_master->api_major) >= _maj && \
29 (psp_master->api_minor) >= _min)
31 #define DEVICE_NAME "sev"
32 #define SEV_FW_FILE "amd/sev.fw"
33 #define SEV_FW_NAME_SIZE 64
35 static DEFINE_MUTEX(sev_cmd_mutex);
36 static struct sev_misc_dev *misc_dev;
37 static struct psp_device *psp_master;
39 static int psp_cmd_timeout = 100;
40 module_param(psp_cmd_timeout, int, 0644);
41 MODULE_PARM_DESC(psp_cmd_timeout, " default timeout value, in seconds, for PSP commands");
43 static int psp_probe_timeout = 5;
44 module_param(psp_probe_timeout, int, 0644);
45 MODULE_PARM_DESC(psp_probe_timeout, " default timeout value, in seconds, during PSP device probe");
48 static int psp_timeout;
50 static struct psp_device *psp_alloc_struct(struct sp_device *sp)
52 struct device *dev = sp->dev;
53 struct psp_device *psp;
55 psp = devm_kzalloc(dev, sizeof(*psp), GFP_KERNEL);
62 snprintf(psp->name, sizeof(psp->name), "psp-%u", sp->ord);
67 static irqreturn_t psp_irq_handler(int irq, void *data)
69 struct psp_device *psp = data;
73 /* Read the interrupt status: */
74 status = ioread32(psp->io_regs + psp->vdata->intsts_reg);
76 /* Check if it is command completion: */
77 if (!(status & PSP_CMD_COMPLETE))
80 /* Check if it is SEV command completion: */
81 reg = ioread32(psp->io_regs + psp->vdata->cmdresp_reg);
82 if (reg & PSP_CMDRESP_RESP) {
83 psp->sev_int_rcvd = 1;
84 wake_up(&psp->sev_int_queue);
88 /* Clear the interrupt status by writing the same value we read. */
89 iowrite32(status, psp->io_regs + psp->vdata->intsts_reg);
94 static int sev_wait_cmd_ioc(struct psp_device *psp,
95 unsigned int *reg, unsigned int timeout)
99 ret = wait_event_timeout(psp->sev_int_queue,
100 psp->sev_int_rcvd, timeout * HZ);
104 *reg = ioread32(psp->io_regs + psp->vdata->cmdresp_reg);
109 static int sev_cmd_buffer_len(int cmd)
112 case SEV_CMD_INIT: return sizeof(struct sev_data_init);
113 case SEV_CMD_PLATFORM_STATUS: return sizeof(struct sev_user_data_status);
114 case SEV_CMD_PEK_CSR: return sizeof(struct sev_data_pek_csr);
115 case SEV_CMD_PEK_CERT_IMPORT: return sizeof(struct sev_data_pek_cert_import);
116 case SEV_CMD_PDH_CERT_EXPORT: return sizeof(struct sev_data_pdh_cert_export);
117 case SEV_CMD_LAUNCH_START: return sizeof(struct sev_data_launch_start);
118 case SEV_CMD_LAUNCH_UPDATE_DATA: return sizeof(struct sev_data_launch_update_data);
119 case SEV_CMD_LAUNCH_UPDATE_VMSA: return sizeof(struct sev_data_launch_update_vmsa);
120 case SEV_CMD_LAUNCH_FINISH: return sizeof(struct sev_data_launch_finish);
121 case SEV_CMD_LAUNCH_MEASURE: return sizeof(struct sev_data_launch_measure);
122 case SEV_CMD_ACTIVATE: return sizeof(struct sev_data_activate);
123 case SEV_CMD_DEACTIVATE: return sizeof(struct sev_data_deactivate);
124 case SEV_CMD_DECOMMISSION: return sizeof(struct sev_data_decommission);
125 case SEV_CMD_GUEST_STATUS: return sizeof(struct sev_data_guest_status);
126 case SEV_CMD_DBG_DECRYPT: return sizeof(struct sev_data_dbg);
127 case SEV_CMD_DBG_ENCRYPT: return sizeof(struct sev_data_dbg);
128 case SEV_CMD_SEND_START: return sizeof(struct sev_data_send_start);
129 case SEV_CMD_SEND_UPDATE_DATA: return sizeof(struct sev_data_send_update_data);
130 case SEV_CMD_SEND_UPDATE_VMSA: return sizeof(struct sev_data_send_update_vmsa);
131 case SEV_CMD_SEND_FINISH: return sizeof(struct sev_data_send_finish);
132 case SEV_CMD_RECEIVE_START: return sizeof(struct sev_data_receive_start);
133 case SEV_CMD_RECEIVE_FINISH: return sizeof(struct sev_data_receive_finish);
134 case SEV_CMD_RECEIVE_UPDATE_DATA: return sizeof(struct sev_data_receive_update_data);
135 case SEV_CMD_RECEIVE_UPDATE_VMSA: return sizeof(struct sev_data_receive_update_vmsa);
136 case SEV_CMD_LAUNCH_UPDATE_SECRET: return sizeof(struct sev_data_launch_secret);
137 case SEV_CMD_DOWNLOAD_FIRMWARE: return sizeof(struct sev_data_download_firmware);
138 case SEV_CMD_GET_ID: return sizeof(struct sev_data_get_id);
145 static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret)
147 struct psp_device *psp = psp_master;
148 unsigned int phys_lsb, phys_msb;
149 unsigned int reg, ret = 0;
157 /* Get the physical address of the command buffer */
158 phys_lsb = data ? lower_32_bits(__psp_pa(data)) : 0;
159 phys_msb = data ? upper_32_bits(__psp_pa(data)) : 0;
161 dev_dbg(psp->dev, "sev command id %#x buffer 0x%08x%08x timeout %us\n",
162 cmd, phys_msb, phys_lsb, psp_timeout);
164 print_hex_dump_debug("(in): ", DUMP_PREFIX_OFFSET, 16, 2, data,
165 sev_cmd_buffer_len(cmd), false);
167 iowrite32(phys_lsb, psp->io_regs + psp->vdata->cmdbuff_addr_lo_reg);
168 iowrite32(phys_msb, psp->io_regs + psp->vdata->cmdbuff_addr_hi_reg);
170 psp->sev_int_rcvd = 0;
173 reg <<= PSP_CMDRESP_CMD_SHIFT;
174 reg |= PSP_CMDRESP_IOC;
175 iowrite32(reg, psp->io_regs + psp->vdata->cmdresp_reg);
177 /* wait for command completion */
178 ret = sev_wait_cmd_ioc(psp, ®, psp_timeout);
183 dev_err(psp->dev, "sev command %#x timed out, disabling PSP \n", cmd);
189 psp_timeout = psp_cmd_timeout;
192 *psp_ret = reg & PSP_CMDRESP_ERR_MASK;
194 if (reg & PSP_CMDRESP_ERR_MASK) {
195 dev_dbg(psp->dev, "sev command %#x failed (%#010x)\n",
196 cmd, reg & PSP_CMDRESP_ERR_MASK);
200 print_hex_dump_debug("(out): ", DUMP_PREFIX_OFFSET, 16, 2, data,
201 sev_cmd_buffer_len(cmd), false);
206 static int sev_do_cmd(int cmd, void *data, int *psp_ret)
210 mutex_lock(&sev_cmd_mutex);
211 rc = __sev_do_cmd_locked(cmd, data, psp_ret);
212 mutex_unlock(&sev_cmd_mutex);
217 static int __sev_platform_init_locked(int *error)
219 struct psp_device *psp = psp_master;
225 if (psp->sev_state == SEV_STATE_INIT)
228 rc = __sev_do_cmd_locked(SEV_CMD_INIT, &psp->init_cmd_buf, error);
232 psp->sev_state = SEV_STATE_INIT;
233 dev_dbg(psp->dev, "SEV firmware initialized\n");
238 int sev_platform_init(int *error)
242 mutex_lock(&sev_cmd_mutex);
243 rc = __sev_platform_init_locked(error);
244 mutex_unlock(&sev_cmd_mutex);
248 EXPORT_SYMBOL_GPL(sev_platform_init);
250 static int __sev_platform_shutdown_locked(int *error)
254 ret = __sev_do_cmd_locked(SEV_CMD_SHUTDOWN, NULL, error);
258 psp_master->sev_state = SEV_STATE_UNINIT;
259 dev_dbg(psp_master->dev, "SEV firmware shutdown\n");
264 static int sev_platform_shutdown(int *error)
268 mutex_lock(&sev_cmd_mutex);
269 rc = __sev_platform_shutdown_locked(NULL);
270 mutex_unlock(&sev_cmd_mutex);
275 static int sev_get_platform_state(int *state, int *error)
279 rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS,
280 &psp_master->status_cmd_buf, error);
284 *state = psp_master->status_cmd_buf.state;
288 static int sev_ioctl_do_reset(struct sev_issue_cmd *argp)
293 * The SEV spec requires that FACTORY_RESET must be issued in
294 * UNINIT state. Before we go further lets check if any guest is
297 * If FW is in WORKING state then deny the request otherwise issue
298 * SHUTDOWN command do INIT -> UNINIT before issuing the FACTORY_RESET.
301 rc = sev_get_platform_state(&state, &argp->error);
305 if (state == SEV_STATE_WORKING)
308 if (state == SEV_STATE_INIT) {
309 rc = __sev_platform_shutdown_locked(&argp->error);
314 return __sev_do_cmd_locked(SEV_CMD_FACTORY_RESET, NULL, &argp->error);
317 static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp)
319 struct sev_user_data_status *data = &psp_master->status_cmd_buf;
322 ret = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, data, &argp->error);
326 if (copy_to_user((void __user *)argp->data, data, sizeof(*data)))
332 static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp)
336 if (psp_master->sev_state == SEV_STATE_UNINIT) {
337 rc = __sev_platform_init_locked(&argp->error);
342 return __sev_do_cmd_locked(cmd, NULL, &argp->error);
345 static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp)
347 struct sev_user_data_pek_csr input;
348 struct sev_data_pek_csr *data;
352 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
355 data = kzalloc(sizeof(*data), GFP_KERNEL);
359 /* userspace wants to query CSR length */
360 if (!input.address || !input.length)
363 /* allocate a physically contiguous buffer to store the CSR blob */
364 if (!access_ok(input.address, input.length) ||
365 input.length > SEV_FW_BLOB_MAX_SIZE) {
370 blob = kmalloc(input.length, GFP_KERNEL);
376 data->address = __psp_pa(blob);
377 data->len = input.length;
380 if (psp_master->sev_state == SEV_STATE_UNINIT) {
381 ret = __sev_platform_init_locked(&argp->error);
386 ret = __sev_do_cmd_locked(SEV_CMD_PEK_CSR, data, &argp->error);
388 /* If we query the CSR length, FW responded with expected data. */
389 input.length = data->len;
391 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
397 if (copy_to_user((void __user *)input.address, blob, input.length))
408 void *psp_copy_user_blob(u64 __user uaddr, u32 len)
411 return ERR_PTR(-EINVAL);
413 /* verify that blob length does not exceed our limit */
414 if (len > SEV_FW_BLOB_MAX_SIZE)
415 return ERR_PTR(-EINVAL);
417 return memdup_user((void __user *)(uintptr_t)uaddr, len);
419 EXPORT_SYMBOL_GPL(psp_copy_user_blob);
421 static int sev_get_api_version(void)
423 struct sev_user_data_status *status;
426 status = &psp_master->status_cmd_buf;
427 ret = sev_platform_status(status, &error);
429 dev_err(psp_master->dev,
430 "SEV: failed to get status. Error: %#x\n", error);
434 psp_master->api_major = status->api_major;
435 psp_master->api_minor = status->api_minor;
436 psp_master->build = status->build;
437 psp_master->sev_state = status->state;
442 static int sev_get_firmware(struct device *dev,
443 const struct firmware **firmware)
445 char fw_name_specific[SEV_FW_NAME_SIZE];
446 char fw_name_subset[SEV_FW_NAME_SIZE];
448 snprintf(fw_name_specific, sizeof(fw_name_specific),
449 "amd/amd_sev_fam%.2xh_model%.2xh.sbin",
450 boot_cpu_data.x86, boot_cpu_data.x86_model);
452 snprintf(fw_name_subset, sizeof(fw_name_subset),
453 "amd/amd_sev_fam%.2xh_model%.1xxh.sbin",
454 boot_cpu_data.x86, (boot_cpu_data.x86_model & 0xf0) >> 4);
456 /* Check for SEV FW for a particular model.
457 * Ex. amd_sev_fam17h_model00h.sbin for Family 17h Model 00h
461 * Check for SEV FW common to a subset of models.
462 * Ex. amd_sev_fam17h_model0xh.sbin for
463 * Family 17h Model 00h -- Family 17h Model 0Fh
467 * Fall-back to using generic name: sev.fw
469 if ((firmware_request_nowarn(firmware, fw_name_specific, dev) >= 0) ||
470 (firmware_request_nowarn(firmware, fw_name_subset, dev) >= 0) ||
471 (firmware_request_nowarn(firmware, SEV_FW_FILE, dev) >= 0))
477 /* Don't fail if SEV FW couldn't be updated. Continue with existing SEV FW */
478 static int sev_update_firmware(struct device *dev)
480 struct sev_data_download_firmware *data;
481 const struct firmware *firmware;
482 int ret, error, order;
486 if (sev_get_firmware(dev, &firmware) == -ENOENT) {
487 dev_dbg(dev, "No SEV firmware file present\n");
492 * SEV FW expects the physical address given to it to be 32
493 * byte aligned. Memory allocated has structure placed at the
494 * beginning followed by the firmware being passed to the SEV
495 * FW. Allocate enough memory for data structure + alignment
498 data_size = ALIGN(sizeof(struct sev_data_download_firmware), 32);
500 order = get_order(firmware->size + data_size);
501 p = alloc_pages(GFP_KERNEL, order);
508 * Copy firmware data to a kernel allocated contiguous
511 data = page_address(p);
512 memcpy(page_address(p) + data_size, firmware->data, firmware->size);
514 data->address = __psp_pa(page_address(p) + data_size);
515 data->len = firmware->size;
517 ret = sev_do_cmd(SEV_CMD_DOWNLOAD_FIRMWARE, data, &error);
519 dev_dbg(dev, "Failed to update SEV firmware: %#x\n", error);
521 dev_info(dev, "SEV firmware update successful\n");
523 __free_pages(p, order);
526 release_firmware(firmware);
531 static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp)
533 struct sev_user_data_pek_cert_import input;
534 struct sev_data_pek_cert_import *data;
535 void *pek_blob, *oca_blob;
538 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
541 data = kzalloc(sizeof(*data), GFP_KERNEL);
545 /* copy PEK certificate blobs from userspace */
546 pek_blob = psp_copy_user_blob(input.pek_cert_address, input.pek_cert_len);
547 if (IS_ERR(pek_blob)) {
548 ret = PTR_ERR(pek_blob);
552 data->pek_cert_address = __psp_pa(pek_blob);
553 data->pek_cert_len = input.pek_cert_len;
555 /* copy PEK certificate blobs from userspace */
556 oca_blob = psp_copy_user_blob(input.oca_cert_address, input.oca_cert_len);
557 if (IS_ERR(oca_blob)) {
558 ret = PTR_ERR(oca_blob);
562 data->oca_cert_address = __psp_pa(oca_blob);
563 data->oca_cert_len = input.oca_cert_len;
565 /* If platform is not in INIT state then transition it to INIT */
566 if (psp_master->sev_state != SEV_STATE_INIT) {
567 ret = __sev_platform_init_locked(&argp->error);
572 ret = __sev_do_cmd_locked(SEV_CMD_PEK_CERT_IMPORT, data, &argp->error);
583 static int sev_ioctl_do_get_id2(struct sev_issue_cmd *argp)
585 struct sev_user_data_get_id2 input;
586 struct sev_data_get_id *data;
587 void *id_blob = NULL;
590 /* SEV GET_ID is available from SEV API v0.16 and up */
591 if (!SEV_VERSION_GREATER_OR_EQUAL(0, 16))
594 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
597 /* Check if we have write access to the userspace buffer */
600 !access_ok(input.address, input.length))
603 data = kzalloc(sizeof(*data), GFP_KERNEL);
607 if (input.address && input.length) {
608 id_blob = kmalloc(input.length, GFP_KERNEL);
614 data->address = __psp_pa(id_blob);
615 data->len = input.length;
618 ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error);
621 * Firmware will return the length of the ID value (either the minimum
622 * required length or the actual length written), return it to the user.
624 input.length = data->len;
626 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
632 if (copy_to_user((void __user *)input.address,
633 id_blob, data->len)) {
646 static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp)
648 struct sev_data_get_id *data;
649 u64 data_size, user_size;
653 /* SEV GET_ID available from SEV API v0.16 and up */
654 if (!SEV_VERSION_GREATER_OR_EQUAL(0, 16))
657 /* SEV FW expects the buffer it fills with the ID to be
658 * 8-byte aligned. Memory allocated should be enough to
659 * hold data structure + alignment padding + memory
660 * where SEV FW writes the ID.
662 data_size = ALIGN(sizeof(struct sev_data_get_id), 8);
663 user_size = sizeof(struct sev_user_data_get_id);
665 mem = kzalloc(data_size + user_size, GFP_KERNEL);
670 id_blob = mem + data_size;
672 data->address = __psp_pa(id_blob);
673 data->len = user_size;
675 ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error);
677 if (copy_to_user((void __user *)argp->data, id_blob, data->len))
686 static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp)
688 struct sev_user_data_pdh_cert_export input;
689 void *pdh_blob = NULL, *cert_blob = NULL;
690 struct sev_data_pdh_cert_export *data;
693 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
696 data = kzalloc(sizeof(*data), GFP_KERNEL);
700 /* Userspace wants to query the certificate length. */
701 if (!input.pdh_cert_address ||
702 !input.pdh_cert_len ||
703 !input.cert_chain_address)
706 /* Allocate a physically contiguous buffer to store the PDH blob. */
707 if ((input.pdh_cert_len > SEV_FW_BLOB_MAX_SIZE) ||
708 !access_ok(input.pdh_cert_address, input.pdh_cert_len)) {
713 /* Allocate a physically contiguous buffer to store the cert chain blob. */
714 if ((input.cert_chain_len > SEV_FW_BLOB_MAX_SIZE) ||
715 !access_ok(input.cert_chain_address, input.cert_chain_len)) {
720 pdh_blob = kmalloc(input.pdh_cert_len, GFP_KERNEL);
726 data->pdh_cert_address = __psp_pa(pdh_blob);
727 data->pdh_cert_len = input.pdh_cert_len;
729 cert_blob = kmalloc(input.cert_chain_len, GFP_KERNEL);
735 data->cert_chain_address = __psp_pa(cert_blob);
736 data->cert_chain_len = input.cert_chain_len;
739 /* If platform is not in INIT state then transition it to INIT. */
740 if (psp_master->sev_state != SEV_STATE_INIT) {
741 ret = __sev_platform_init_locked(&argp->error);
746 ret = __sev_do_cmd_locked(SEV_CMD_PDH_CERT_EXPORT, data, &argp->error);
748 /* If we query the length, FW responded with expected data. */
749 input.cert_chain_len = data->cert_chain_len;
750 input.pdh_cert_len = data->pdh_cert_len;
752 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
758 if (copy_to_user((void __user *)input.pdh_cert_address,
759 pdh_blob, input.pdh_cert_len)) {
766 if (copy_to_user((void __user *)input.cert_chain_address,
767 cert_blob, input.cert_chain_len))
780 static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
782 void __user *argp = (void __user *)arg;
783 struct sev_issue_cmd input;
789 if (ioctl != SEV_ISSUE_CMD)
792 if (copy_from_user(&input, argp, sizeof(struct sev_issue_cmd)))
795 if (input.cmd > SEV_MAX)
798 mutex_lock(&sev_cmd_mutex);
802 case SEV_FACTORY_RESET:
803 ret = sev_ioctl_do_reset(&input);
805 case SEV_PLATFORM_STATUS:
806 ret = sev_ioctl_do_platform_status(&input);
809 ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PEK_GEN, &input);
812 ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PDH_GEN, &input);
815 ret = sev_ioctl_do_pek_csr(&input);
817 case SEV_PEK_CERT_IMPORT:
818 ret = sev_ioctl_do_pek_import(&input);
820 case SEV_PDH_CERT_EXPORT:
821 ret = sev_ioctl_do_pdh_export(&input);
824 pr_warn_once("SEV_GET_ID command is deprecated, use SEV_GET_ID2\n");
825 ret = sev_ioctl_do_get_id(&input);
828 ret = sev_ioctl_do_get_id2(&input);
835 if (copy_to_user(argp, &input, sizeof(struct sev_issue_cmd)))
838 mutex_unlock(&sev_cmd_mutex);
843 static const struct file_operations sev_fops = {
844 .owner = THIS_MODULE,
845 .unlocked_ioctl = sev_ioctl,
848 int sev_platform_status(struct sev_user_data_status *data, int *error)
850 return sev_do_cmd(SEV_CMD_PLATFORM_STATUS, data, error);
852 EXPORT_SYMBOL_GPL(sev_platform_status);
854 int sev_guest_deactivate(struct sev_data_deactivate *data, int *error)
856 return sev_do_cmd(SEV_CMD_DEACTIVATE, data, error);
858 EXPORT_SYMBOL_GPL(sev_guest_deactivate);
860 int sev_guest_activate(struct sev_data_activate *data, int *error)
862 return sev_do_cmd(SEV_CMD_ACTIVATE, data, error);
864 EXPORT_SYMBOL_GPL(sev_guest_activate);
866 int sev_guest_decommission(struct sev_data_decommission *data, int *error)
868 return sev_do_cmd(SEV_CMD_DECOMMISSION, data, error);
870 EXPORT_SYMBOL_GPL(sev_guest_decommission);
872 int sev_guest_df_flush(int *error)
874 return sev_do_cmd(SEV_CMD_DF_FLUSH, NULL, error);
876 EXPORT_SYMBOL_GPL(sev_guest_df_flush);
878 static void sev_exit(struct kref *ref)
880 struct sev_misc_dev *misc_dev = container_of(ref, struct sev_misc_dev, refcount);
882 misc_deregister(&misc_dev->misc);
885 static int sev_misc_init(struct psp_device *psp)
887 struct device *dev = psp->dev;
891 * SEV feature support can be detected on multiple devices but the SEV
892 * FW commands must be issued on the master. During probe, we do not
893 * know the master hence we create /dev/sev on the first device probe.
894 * sev_do_cmd() finds the right master device to which to issue the
895 * command to the firmware.
898 struct miscdevice *misc;
900 misc_dev = devm_kzalloc(dev, sizeof(*misc_dev), GFP_KERNEL);
904 misc = &misc_dev->misc;
905 misc->minor = MISC_DYNAMIC_MINOR;
906 misc->name = DEVICE_NAME;
907 misc->fops = &sev_fops;
909 ret = misc_register(misc);
913 kref_init(&misc_dev->refcount);
915 kref_get(&misc_dev->refcount);
918 init_waitqueue_head(&psp->sev_int_queue);
919 psp->sev_misc = misc_dev;
920 dev_dbg(dev, "registered SEV device\n");
925 static int psp_check_sev_support(struct psp_device *psp)
927 /* Check if device supports SEV feature */
928 if (!(ioread32(psp->io_regs + psp->vdata->feature_reg) & 1)) {
929 dev_dbg(psp->dev, "psp does not support SEV\n");
936 int psp_dev_init(struct sp_device *sp)
938 struct device *dev = sp->dev;
939 struct psp_device *psp;
943 psp = psp_alloc_struct(sp);
949 psp->vdata = (struct psp_vdata *)sp->dev_vdata->psp_vdata;
952 dev_err(dev, "missing driver data\n");
956 psp->io_regs = sp->io_map;
958 ret = psp_check_sev_support(psp);
962 /* Disable and clear interrupts until ready */
963 iowrite32(0, psp->io_regs + psp->vdata->inten_reg);
964 iowrite32(-1, psp->io_regs + psp->vdata->intsts_reg);
967 ret = sp_request_psp_irq(psp->sp, psp_irq_handler, psp->name, psp);
969 dev_err(dev, "psp: unable to allocate an IRQ\n");
973 ret = sev_misc_init(psp);
977 if (sp->set_psp_master_device)
978 sp->set_psp_master_device(sp);
980 /* Enable interrupt */
981 iowrite32(-1, psp->io_regs + psp->vdata->inten_reg);
983 dev_notice(dev, "psp enabled\n");
988 sp_free_psp_irq(psp->sp, psp);
992 dev_notice(dev, "psp initialization failed\n");
1002 void psp_dev_destroy(struct sp_device *sp)
1004 struct psp_device *psp = sp->psp_data;
1010 kref_put(&misc_dev->refcount, sev_exit);
1012 sp_free_psp_irq(sp, psp);
1015 int sev_issue_cmd_external_user(struct file *filep, unsigned int cmd,
1016 void *data, int *error)
1018 if (!filep || filep->f_op != &sev_fops)
1021 return sev_do_cmd(cmd, data, error);
1023 EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user);
1025 void psp_pci_init(void)
1027 struct sp_device *sp;
1030 sp = sp_get_psp_master_device();
1034 psp_master = sp->psp_data;
1036 psp_timeout = psp_probe_timeout;
1038 if (sev_get_api_version())
1042 * If platform is not in UNINIT state then firmware upgrade and/or
1043 * platform INIT command will fail. These command require UNINIT state.
1045 * In a normal boot we should never run into case where the firmware
1046 * is not in UNINIT state on boot. But in case of kexec boot, a reboot
1047 * may not go through a typical shutdown sequence and may leave the
1048 * firmware in INIT or WORKING state.
1051 if (psp_master->sev_state != SEV_STATE_UNINIT) {
1052 sev_platform_shutdown(NULL);
1053 psp_master->sev_state = SEV_STATE_UNINIT;
1056 if (SEV_VERSION_GREATER_OR_EQUAL(0, 15) &&
1057 sev_update_firmware(psp_master->dev) == 0)
1058 sev_get_api_version();
1060 /* Initialize the platform */
1061 rc = sev_platform_init(&error);
1063 dev_err(sp->dev, "SEV: failed to INIT error %#x\n", error);
1067 dev_info(sp->dev, "SEV API:%d.%d build:%d\n", psp_master->api_major,
1068 psp_master->api_minor, psp_master->build);
1076 void psp_pci_exit(void)
1081 sev_platform_shutdown(NULL);