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
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2015 Pengutronix, Steffen Trumtrar <kernel@pengutronix.de>
* Copyright (C) 2021 Pengutronix, Ahmad Fatoum <kernel@pengutronix.de>
*/
#define pr_fmt(fmt) "caam blob_gen: " fmt
#include <linux/bitfield.h>
#include <linux/device.h>
#include <soc/fsl/caam-blob.h>
#include "compat.h"
#include "desc_constr.h"
#include "desc.h"
#include "error.h"
#include "intern.h"
#include "jr.h"
#include "regs.h"
#define CAAM_BLOB_DESC_BYTES_MAX \
/* Command to initialize & stating length of descriptor */ \
(CAAM_CMD_SZ + \
/* Command to append the key-modifier + key-modifier data */ \
CAAM_CMD_SZ + CAAM_BLOB_KEYMOD_LENGTH + \
/* Command to include input key + pointer to the input key */ \
CAAM_CMD_SZ + CAAM_PTR_SZ_MAX + \
/* Command to include output key + pointer to the output key */ \
CAAM_CMD_SZ + CAAM_PTR_SZ_MAX + \
/* Command describing the operation to perform */ \
CAAM_CMD_SZ)
struct caam_blob_priv {
struct device jrdev;
};
struct caam_blob_job_result {
int err;
struct completion completion;
};
static void caam_blob_job_done(struct device *dev, u32 *desc, u32 err, void *context)
{
struct caam_blob_job_result *res = context;
int ecode = 0;
dev_dbg(dev, "%s %d: err 0x%x\n", __func__, __LINE__, err);
if (err)
ecode = caam_jr_strstatus(dev, err);
res->err = ecode;
/*
* Upon completion, desc points to a buffer containing a CAAM job
* descriptor which encapsulates data into an externally-storable
* blob.
*/
complete(&res->completion);
}
int caam_process_blob(struct caam_blob_priv *priv,
struct caam_blob_info *info, bool encap)
{
const struct caam_drv_private *ctrlpriv;
struct caam_blob_job_result testres;
struct device *jrdev = &priv->jrdev;
dma_addr_t dma_in, dma_out;
int op = OP_PCLID_BLOB;
size_t output_len;
u32 *desc;
u32 moo;
int ret;
if (info->key_mod_len > CAAM_BLOB_KEYMOD_LENGTH)
return -EINVAL;
if (encap) {
op |= OP_TYPE_ENCAP_PROTOCOL;
output_len = info->input_len + CAAM_BLOB_OVERHEAD;
} else {
op |= OP_TYPE_DECAP_PROTOCOL;
output_len = info->input_len - CAAM_BLOB_OVERHEAD;
}
desc = kzalloc(CAAM_BLOB_DESC_BYTES_MAX, GFP_KERNEL | GFP_DMA);
if (!desc)
return -ENOMEM;
dma_in = dma_map_single(jrdev, info->input, info->input_len,
DMA_TO_DEVICE);
if (dma_mapping_error(jrdev, dma_in)) {
dev_err(jrdev, "unable to map input DMA buffer\n");
ret = -ENOMEM;
goto out_free;
}
dma_out = dma_map_single(jrdev, info->output, output_len,
DMA_FROM_DEVICE);
if (dma_mapping_error(jrdev, dma_out)) {
dev_err(jrdev, "unable to map output DMA buffer\n");
ret = -ENOMEM;
goto out_unmap_in;
}
ctrlpriv = dev_get_drvdata(jrdev->parent);
moo = FIELD_GET(CSTA_MOO, rd_reg32(&ctrlpriv->ctrl->perfmon.status));
if (moo != CSTA_MOO_SECURE && moo != CSTA_MOO_TRUSTED)
dev_warn(jrdev,
"using insecure test key, enable HAB to use unique device key!\n");
/*
* A data blob is encrypted using a blob key (BK); a random number.
* The BK is used as an AES-CCM key. The initial block (B0) and the
* initial counter (Ctr0) are generated automatically and stored in
* Class 1 Context DWords 0+1+2+3. The random BK is stored in the
* Class 1 Key Register. Operation Mode is set to AES-CCM.
*/
init_job_desc(desc, 0);
append_key_as_imm(desc, info->key_mod, info->key_mod_len,
info->key_mod_len, CLASS_2 | KEY_DEST_CLASS_REG);
append_seq_in_ptr_intlen(desc, dma_in, info->input_len, 0);
append_seq_out_ptr_intlen(desc, dma_out, output_len, 0);
append_operation(desc, op);
print_hex_dump_debug("data@"__stringify(__LINE__)": ",
DUMP_PREFIX_ADDRESS, 16, 1, info->input,
info->input_len, false);
print_hex_dump_debug("jobdesc@"__stringify(__LINE__)": ",
DUMP_PREFIX_ADDRESS, 16, 1, desc,
desc_bytes(desc), false);
testres.err = 0;
init_completion(&testres.completion);
ret = caam_jr_enqueue(jrdev, desc, caam_blob_job_done, &testres);
if (ret == -EINPROGRESS) {
wait_for_completion(&testres.completion);
ret = testres.err;
print_hex_dump_debug("output@"__stringify(__LINE__)": ",
DUMP_PREFIX_ADDRESS, 16, 1, info->output,
output_len, false);
}
if (ret == 0)
info->output_len = output_len;
dma_unmap_single(jrdev, dma_out, output_len, DMA_FROM_DEVICE);
out_unmap_in:
dma_unmap_single(jrdev, dma_in, info->input_len, DMA_TO_DEVICE);
out_free:
kfree(desc);
return ret;
}
EXPORT_SYMBOL(caam_process_blob);
struct caam_blob_priv *caam_blob_gen_init(void)
{
struct caam_drv_private *ctrlpriv;
struct device *jrdev;
/*
* caam_blob_gen_init() may expectedly fail with -ENODEV, e.g. when
* CAAM driver didn't probe or when SoC lacks BLOB support. An
* error would be harsh in this case, so we stick to info level.
*/
jrdev = caam_jr_alloc();
if (IS_ERR(jrdev)) {
pr_info("job ring requested, but none currently available\n");
return ERR_PTR(-ENODEV);
}
ctrlpriv = dev_get_drvdata(jrdev->parent);
if (!ctrlpriv->blob_present) {
dev_info(jrdev, "no hardware blob generation support\n");
caam_jr_free(jrdev);
return ERR_PTR(-ENODEV);
}
return container_of(jrdev, struct caam_blob_priv, jrdev);
}
EXPORT_SYMBOL(caam_blob_gen_init);
void caam_blob_gen_exit(struct caam_blob_priv *priv)
{
caam_jr_free(&priv->jrdev);
}
EXPORT_SYMBOL(caam_blob_gen_exit);
|
