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
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
|
// SPDX-License-Identifier: MIT
/*
* Copyright 2023, Intel Corporation.
*/
#include <drm/intel/i915_hdcp_interface.h>
#include "gem/i915_gem_region.h"
#include "gt/intel_gt.h"
#include "gt/uc/intel_gsc_uc_heci_cmd_submit.h"
#include "i915_drv.h"
#include "i915_utils.h"
#include "intel_hdcp_gsc.h"
struct intel_hdcp_gsc_context {
struct drm_i915_private *i915;
struct i915_vma *vma;
void *hdcp_cmd_in;
void *hdcp_cmd_out;
};
bool intel_hdcp_gsc_check_status(struct drm_device *drm)
{
struct drm_i915_private *i915 = to_i915(drm);
struct intel_gt *gt = i915->media_gt;
struct intel_gsc_uc *gsc = gt ? >->uc.gsc : NULL;
if (!gsc || !intel_uc_fw_is_running(&gsc->fw)) {
drm_dbg_kms(&i915->drm,
"GSC components required for HDCP2.2 are not ready\n");
return false;
}
return true;
}
/*This function helps allocate memory for the command that we will send to gsc cs */
static int intel_hdcp_gsc_initialize_message(struct drm_i915_private *i915,
struct intel_hdcp_gsc_context *gsc_context)
{
struct intel_gt *gt = i915->media_gt;
struct drm_i915_gem_object *obj = NULL;
struct i915_vma *vma = NULL;
void *cmd_in, *cmd_out;
int err;
/* allocate object of two page for HDCP command memory and store it */
obj = i915_gem_object_create_shmem(i915, 2 * PAGE_SIZE);
if (IS_ERR(obj)) {
drm_err(&i915->drm, "Failed to allocate HDCP streaming command!\n");
return PTR_ERR(obj);
}
cmd_in = i915_gem_object_pin_map_unlocked(obj, intel_gt_coherent_map_type(gt, obj, true));
if (IS_ERR(cmd_in)) {
drm_err(&i915->drm, "Failed to map gsc message page!\n");
err = PTR_ERR(cmd_in);
goto out_unpin;
}
cmd_out = cmd_in + PAGE_SIZE;
vma = i915_vma_instance(obj, >->ggtt->vm, NULL);
if (IS_ERR(vma)) {
err = PTR_ERR(vma);
goto out_unmap;
}
err = i915_vma_pin(vma, 0, 0, PIN_GLOBAL | PIN_HIGH);
if (err)
goto out_unmap;
memset(cmd_in, 0, obj->base.size);
gsc_context->hdcp_cmd_in = cmd_in;
gsc_context->hdcp_cmd_out = cmd_out;
gsc_context->vma = vma;
gsc_context->i915 = i915;
return 0;
out_unmap:
i915_gem_object_unpin_map(obj);
out_unpin:
i915_gem_object_put(obj);
return err;
}
struct intel_hdcp_gsc_context *intel_hdcp_gsc_context_alloc(struct drm_device *drm)
{
struct drm_i915_private *i915 = to_i915(drm);
struct intel_hdcp_gsc_context *gsc_context;
int ret;
gsc_context = kzalloc(sizeof(*gsc_context), GFP_KERNEL);
if (!gsc_context)
return ERR_PTR(-ENOMEM);
/*
* NOTE: No need to lock the comp mutex here as it is already
* going to be taken before this function called
*/
ret = intel_hdcp_gsc_initialize_message(i915, gsc_context);
if (ret) {
drm_err(&i915->drm, "Could not initialize gsc_context\n");
kfree(gsc_context);
gsc_context = ERR_PTR(ret);
}
return gsc_context;
}
void intel_hdcp_gsc_context_free(struct intel_hdcp_gsc_context *gsc_context)
{
if (!gsc_context)
return;
i915_vma_unpin_and_release(&gsc_context->vma, I915_VMA_RELEASE_MAP);
kfree(gsc_context);
}
static int intel_gsc_send_sync(struct drm_i915_private *i915,
struct intel_gsc_mtl_header *header_in,
struct intel_gsc_mtl_header *header_out,
u64 addr_in, u64 addr_out,
size_t msg_out_len)
{
struct intel_gt *gt = i915->media_gt;
int ret;
ret = intel_gsc_uc_heci_cmd_submit_packet(>->uc.gsc, addr_in,
header_in->message_size,
addr_out,
msg_out_len + sizeof(*header_out));
if (ret) {
drm_err(&i915->drm, "failed to send gsc HDCP msg (%d)\n", ret);
return ret;
}
/*
* Checking validity marker and header status to see if some error has
* blocked us from sending message to gsc cs
*/
if (header_out->validity_marker != GSC_HECI_VALIDITY_MARKER) {
drm_err(&i915->drm, "invalid validity marker\n");
return -EINVAL;
}
if (header_out->status != 0) {
drm_err(&i915->drm, "header status indicates error %d\n",
header_out->status);
return -EINVAL;
}
if (header_out->flags & GSC_OUTFLAG_MSG_PENDING) {
header_in->gsc_message_handle = header_out->gsc_message_handle;
return -EAGAIN;
}
return 0;
}
/*
* This function can now be used for sending requests and will also handle
* receipt of reply messages hence no different function of message retrieval
* is required. We will initialize intel_hdcp_gsc_context structure then add
* gsc cs memory header as stated in specs after which the normal HDCP payload
* will follow
*/
ssize_t intel_hdcp_gsc_msg_send(struct intel_hdcp_gsc_context *gsc_context,
void *msg_in, size_t msg_in_len,
void *msg_out, size_t msg_out_len)
{
struct drm_i915_private *i915 = gsc_context->i915;
struct intel_gt *gt = i915->media_gt;
struct intel_gsc_mtl_header *header_in, *header_out;
const size_t max_msg_size = PAGE_SIZE - sizeof(*header_in);
u64 addr_in, addr_out, host_session_id;
u32 reply_size, msg_size_in, msg_size_out;
int ret, tries = 0;
if (!intel_uc_uses_gsc_uc(>->uc))
return -ENODEV;
if (msg_in_len > max_msg_size || msg_out_len > max_msg_size)
return -ENOSPC;
msg_size_in = msg_in_len + sizeof(*header_in);
msg_size_out = msg_out_len + sizeof(*header_out);
header_in = gsc_context->hdcp_cmd_in;
header_out = gsc_context->hdcp_cmd_out;
addr_in = i915_ggtt_offset(gsc_context->vma);
addr_out = addr_in + PAGE_SIZE;
memset(header_in, 0, msg_size_in);
memset(header_out, 0, msg_size_out);
get_random_bytes(&host_session_id, sizeof(u64));
intel_gsc_uc_heci_cmd_emit_mtl_header(header_in, HECI_MEADDRESS_HDCP,
msg_size_in, host_session_id);
memcpy(gsc_context->hdcp_cmd_in + sizeof(*header_in), msg_in, msg_in_len);
/*
* Keep sending request in case the pending bit is set no need to add
* message handle as we are using same address hence loc. of header is
* same and it will contain the message handle. we will send the message
* 20 times each message 50 ms apart
*/
do {
ret = intel_gsc_send_sync(i915, header_in, header_out, addr_in,
addr_out, msg_out_len);
/* Only try again if gsc says so */
if (ret != -EAGAIN)
break;
msleep(50);
} while (++tries < 20);
if (ret)
goto err;
/* we use the same mem for the reply, so header is in the same loc */
reply_size = header_out->message_size - sizeof(*header_out);
if (reply_size > msg_out_len) {
drm_warn(&i915->drm, "caller with insufficient HDCP reply size %u (%d)\n",
reply_size, (u32)msg_out_len);
reply_size = msg_out_len;
} else if (reply_size != msg_out_len) {
drm_dbg_kms(&i915->drm, "caller unexpected HCDP reply size %u (%d)\n",
reply_size, (u32)msg_out_len);
}
memcpy(msg_out, gsc_context->hdcp_cmd_out + sizeof(*header_out), msg_out_len);
err:
return ret;
}
|
