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| 1 | +// SPDX-License-Identifier: GPL-2.0 |
| 2 | +/* |
| 3 | + * AMD Platform Management Framework Driver - TEE Interface |
| 4 | + * |
| 5 | + * Copyright (c) 2023, Advanced Micro Devices, Inc. |
| 6 | + * All Rights Reserved. |
| 7 | + * |
| 8 | + * Author: Shyam Sundar S K <[email protected]> |
| 9 | + */ |
| 10 | + |
| 11 | +#include <linux/tee_drv.h> |
| 12 | +#include <linux/uuid.h> |
| 13 | +#include "pmf.h" |
| 14 | + |
| 15 | +#define MAX_TEE_PARAM 4 |
| 16 | +static const uuid_t amd_pmf_ta_uuid = UUID_INIT(0x6fd93b77, 0x3fb8, 0x524d, |
| 17 | + 0xb1, 0x2d, 0xc5, 0x29, 0xb1, 0x3d, 0x85, 0x43); |
| 18 | + |
| 19 | +static int amd_pmf_amdtee_ta_match(struct tee_ioctl_version_data *ver, const void *data) |
| 20 | +{ |
| 21 | + return ver->impl_id == TEE_IMPL_ID_AMDTEE; |
| 22 | +} |
| 23 | + |
| 24 | +static int amd_pmf_ta_open_session(struct tee_context *ctx, u32 *id) |
| 25 | +{ |
| 26 | + struct tee_ioctl_open_session_arg sess_arg = {}; |
| 27 | + int rc; |
| 28 | + |
| 29 | + export_uuid(sess_arg.uuid, &amd_pmf_ta_uuid); |
| 30 | + sess_arg.clnt_login = TEE_IOCTL_LOGIN_PUBLIC; |
| 31 | + sess_arg.num_params = 0; |
| 32 | + |
| 33 | + rc = tee_client_open_session(ctx, &sess_arg, NULL); |
| 34 | + if (rc < 0 || sess_arg.ret != 0) { |
| 35 | + pr_err("Failed to open TEE session err:%#x, rc:%d\n", sess_arg.ret, rc); |
| 36 | + return rc; |
| 37 | + } |
| 38 | + |
| 39 | + *id = sess_arg.session; |
| 40 | + |
| 41 | + return rc; |
| 42 | +} |
| 43 | + |
| 44 | +static int amd_pmf_tee_init(struct amd_pmf_dev *dev) |
| 45 | +{ |
| 46 | + u32 size; |
| 47 | + int ret; |
| 48 | + |
| 49 | + dev->tee_ctx = tee_client_open_context(NULL, amd_pmf_amdtee_ta_match, NULL, NULL); |
| 50 | + if (IS_ERR(dev->tee_ctx)) { |
| 51 | + dev_err(dev->dev, "Failed to open TEE context\n"); |
| 52 | + return PTR_ERR(dev->tee_ctx); |
| 53 | + } |
| 54 | + |
| 55 | + ret = amd_pmf_ta_open_session(dev->tee_ctx, &dev->session_id); |
| 56 | + if (ret) { |
| 57 | + dev_err(dev->dev, "Failed to open TA session (%d)\n", ret); |
| 58 | + ret = -EINVAL; |
| 59 | + goto out_ctx; |
| 60 | + } |
| 61 | + |
| 62 | + size = sizeof(struct ta_pmf_shared_memory); |
| 63 | + dev->fw_shm_pool = tee_shm_alloc_kernel_buf(dev->tee_ctx, size); |
| 64 | + if (IS_ERR(dev->fw_shm_pool)) { |
| 65 | + dev_err(dev->dev, "Failed to alloc TEE shared memory\n"); |
| 66 | + ret = PTR_ERR(dev->fw_shm_pool); |
| 67 | + goto out_sess; |
| 68 | + } |
| 69 | + |
| 70 | + dev->shbuf = tee_shm_get_va(dev->fw_shm_pool, 0); |
| 71 | + if (IS_ERR(dev->shbuf)) { |
| 72 | + dev_err(dev->dev, "Failed to get TEE virtual address\n"); |
| 73 | + ret = PTR_ERR(dev->shbuf); |
| 74 | + goto out_shm; |
| 75 | + } |
| 76 | + dev_dbg(dev->dev, "TEE init done\n"); |
| 77 | + |
| 78 | + return 0; |
| 79 | + |
| 80 | +out_shm: |
| 81 | + tee_shm_free(dev->fw_shm_pool); |
| 82 | +out_sess: |
| 83 | + tee_client_close_session(dev->tee_ctx, dev->session_id); |
| 84 | +out_ctx: |
| 85 | + tee_client_close_context(dev->tee_ctx); |
| 86 | + |
| 87 | + return ret; |
| 88 | +} |
| 89 | + |
| 90 | +static void amd_pmf_tee_deinit(struct amd_pmf_dev *dev) |
| 91 | +{ |
| 92 | + tee_shm_free(dev->fw_shm_pool); |
| 93 | + tee_client_close_session(dev->tee_ctx, dev->session_id); |
| 94 | + tee_client_close_context(dev->tee_ctx); |
| 95 | +} |
| 96 | + |
| 97 | +int amd_pmf_init_smart_pc(struct amd_pmf_dev *dev) |
| 98 | +{ |
| 99 | + return amd_pmf_tee_init(dev); |
| 100 | +} |
| 101 | + |
| 102 | +void amd_pmf_deinit_smart_pc(struct amd_pmf_dev *dev) |
| 103 | +{ |
| 104 | + amd_pmf_tee_deinit(dev); |
| 105 | +} |
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