1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2015 Pengutronix, Steffen Trumtrar <kernel@pengutronix.de> 4 * Copyright (C) 2021 Pengutronix, Ahmad Fatoum <kernel@pengutronix.de> 5 */ 6 7 #define pr_fmt(fmt) "caam blob_gen: " fmt 8 9 #include <linux/bitfield.h> 10 #include <linux/device.h> 11 #include <soc/fsl/caam-blob.h> 12 13 #include "compat.h" 14 #include "desc_constr.h" 15 #include "desc.h" 16 #include "error.h" 17 #include "intern.h" 18 #include "jr.h" 19 #include "regs.h" 20 21 #define CAAM_BLOB_DESC_BYTES_MAX \ 22 /* Command to initialize & stating length of descriptor */ \ 23 (CAAM_CMD_SZ + \ 24 /* Command to append the key-modifier + key-modifier data */ \ 25 CAAM_CMD_SZ + CAAM_BLOB_KEYMOD_LENGTH + \ 26 /* Command to include input key + pointer to the input key */ \ 27 CAAM_CMD_SZ + CAAM_PTR_SZ_MAX + \ 28 /* Command to include output key + pointer to the output key */ \ 29 CAAM_CMD_SZ + CAAM_PTR_SZ_MAX + \ 30 /* Command describing the operation to perform */ \ 31 CAAM_CMD_SZ) 32 33 struct caam_blob_priv { 34 struct device jrdev; 35 }; 36 37 struct caam_blob_job_result { 38 int err; 39 struct completion completion; 40 }; 41 42 static void caam_blob_job_done(struct device *dev, u32 *desc, u32 err, void *context) 43 { 44 struct caam_blob_job_result *res = context; 45 int ecode = 0; 46 47 dev_dbg(dev, "%s %d: err 0x%x\n", __func__, __LINE__, err); 48 49 if (err) 50 ecode = caam_jr_strstatus(dev, err); 51 52 res->err = ecode; 53 54 /* 55 * Upon completion, desc points to a buffer containing a CAAM job 56 * descriptor which encapsulates data into an externally-storable 57 * blob. 58 */ 59 complete(&res->completion); 60 } 61 62 int caam_process_blob(struct caam_blob_priv *priv, 63 struct caam_blob_info *info, bool encap) 64 { 65 const struct caam_drv_private *ctrlpriv; 66 struct caam_blob_job_result testres; 67 struct device *jrdev = &priv->jrdev; 68 dma_addr_t dma_in, dma_out; 69 int op = OP_PCLID_BLOB; 70 size_t output_len; 71 u32 *desc; 72 u32 moo; 73 int ret; 74 75 if (info->key_mod_len > CAAM_BLOB_KEYMOD_LENGTH) 76 return -EINVAL; 77 78 if (encap) { 79 op |= OP_TYPE_ENCAP_PROTOCOL; 80 output_len = info->input_len + CAAM_BLOB_OVERHEAD; 81 } else { 82 op |= OP_TYPE_DECAP_PROTOCOL; 83 output_len = info->input_len - CAAM_BLOB_OVERHEAD; 84 } 85 86 desc = kzalloc(CAAM_BLOB_DESC_BYTES_MAX, GFP_KERNEL); 87 if (!desc) 88 return -ENOMEM; 89 90 dma_in = dma_map_single(jrdev, info->input, info->input_len, 91 DMA_TO_DEVICE); 92 if (dma_mapping_error(jrdev, dma_in)) { 93 dev_err(jrdev, "unable to map input DMA buffer\n"); 94 ret = -ENOMEM; 95 goto out_free; 96 } 97 98 dma_out = dma_map_single(jrdev, info->output, output_len, 99 DMA_FROM_DEVICE); 100 if (dma_mapping_error(jrdev, dma_out)) { 101 dev_err(jrdev, "unable to map output DMA buffer\n"); 102 ret = -ENOMEM; 103 goto out_unmap_in; 104 } 105 106 ctrlpriv = dev_get_drvdata(jrdev->parent); 107 moo = FIELD_GET(CSTA_MOO, rd_reg32(&ctrlpriv->ctrl->perfmon.status)); 108 if (moo != CSTA_MOO_SECURE && moo != CSTA_MOO_TRUSTED) 109 dev_warn(jrdev, 110 "using insecure test key, enable HAB to use unique device key!\n"); 111 112 /* 113 * A data blob is encrypted using a blob key (BK); a random number. 114 * The BK is used as an AES-CCM key. The initial block (B0) and the 115 * initial counter (Ctr0) are generated automatically and stored in 116 * Class 1 Context DWords 0+1+2+3. The random BK is stored in the 117 * Class 1 Key Register. Operation Mode is set to AES-CCM. 118 */ 119 120 init_job_desc(desc, 0); 121 append_key_as_imm(desc, info->key_mod, info->key_mod_len, 122 info->key_mod_len, CLASS_2 | KEY_DEST_CLASS_REG); 123 append_seq_in_ptr_intlen(desc, dma_in, info->input_len, 0); 124 append_seq_out_ptr_intlen(desc, dma_out, output_len, 0); 125 append_operation(desc, op); 126 127 print_hex_dump_debug("data@"__stringify(__LINE__)": ", 128 DUMP_PREFIX_ADDRESS, 16, 1, info->input, 129 info->input_len, false); 130 print_hex_dump_debug("jobdesc@"__stringify(__LINE__)": ", 131 DUMP_PREFIX_ADDRESS, 16, 1, desc, 132 desc_bytes(desc), false); 133 134 testres.err = 0; 135 init_completion(&testres.completion); 136 137 ret = caam_jr_enqueue(jrdev, desc, caam_blob_job_done, &testres); 138 if (ret == -EINPROGRESS) { 139 wait_for_completion(&testres.completion); 140 ret = testres.err; 141 print_hex_dump_debug("output@"__stringify(__LINE__)": ", 142 DUMP_PREFIX_ADDRESS, 16, 1, info->output, 143 output_len, false); 144 } 145 146 if (ret == 0) 147 info->output_len = output_len; 148 149 dma_unmap_single(jrdev, dma_out, output_len, DMA_FROM_DEVICE); 150 out_unmap_in: 151 dma_unmap_single(jrdev, dma_in, info->input_len, DMA_TO_DEVICE); 152 out_free: 153 kfree(desc); 154 155 return ret; 156 } 157 EXPORT_SYMBOL(caam_process_blob); 158 159 struct caam_blob_priv *caam_blob_gen_init(void) 160 { 161 struct caam_drv_private *ctrlpriv; 162 struct device *jrdev; 163 164 /* 165 * caam_blob_gen_init() may expectedly fail with -ENODEV, e.g. when 166 * CAAM driver didn't probe or when SoC lacks BLOB support. An 167 * error would be harsh in this case, so we stick to info level. 168 */ 169 170 jrdev = caam_jr_alloc(); 171 if (IS_ERR(jrdev)) { 172 pr_info("job ring requested, but none currently available\n"); 173 return ERR_PTR(-ENODEV); 174 } 175 176 ctrlpriv = dev_get_drvdata(jrdev->parent); 177 if (!ctrlpriv->blob_present) { 178 dev_info(jrdev, "no hardware blob generation support\n"); 179 caam_jr_free(jrdev); 180 return ERR_PTR(-ENODEV); 181 } 182 183 return container_of(jrdev, struct caam_blob_priv, jrdev); 184 } 185 EXPORT_SYMBOL(caam_blob_gen_init); 186 187 void caam_blob_gen_exit(struct caam_blob_priv *priv) 188 { 189 caam_jr_free(&priv->jrdev); 190 } 191 EXPORT_SYMBOL(caam_blob_gen_exit); 192