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1// SPDX-License-Identifier: MIT
2/*
3 * Copyright 2023, Intel Corporation.
4 */
5
6#include <drm/intel/i915_hdcp_interface.h>
7
8#include "gem/i915_gem_region.h"
9#include "gt/intel_gt.h"
10#include "gt/uc/intel_gsc_uc_heci_cmd_submit.h"
11#include "i915_drv.h"
12#include "i915_utils.h"
13#include "intel_hdcp_gsc.h"
14#include "intel_hdcp_gsc_message.h"
15
16struct intel_hdcp_gsc_message {
17 struct i915_vma *vma;
18 void *hdcp_cmd_in;
19 void *hdcp_cmd_out;
20};
21
22bool intel_hdcp_gsc_cs_required(struct intel_display *display)
23{
24 return DISPLAY_VER(display) >= 14;
25}
26
27bool intel_hdcp_gsc_check_status(struct intel_display *display)
28{
29 struct drm_i915_private *i915 = to_i915(display->drm);
30 struct intel_gt *gt = i915->media_gt;
31 struct intel_gsc_uc *gsc = gt ? >->uc.gsc : NULL;
32
33 if (!gsc || !intel_uc_fw_is_running(&gsc->fw)) {
34 drm_dbg_kms(display->drm,
35 "GSC components required for HDCP2.2 are not ready\n");
36 return false;
37 }
38
39 return true;
40}
41
42/*This function helps allocate memory for the command that we will send to gsc cs */
43static int intel_hdcp_gsc_initialize_message(struct drm_i915_private *i915,
44 struct intel_hdcp_gsc_message *hdcp_message)
45{
46 struct intel_gt *gt = i915->media_gt;
47 struct drm_i915_gem_object *obj = NULL;
48 struct i915_vma *vma = NULL;
49 void *cmd_in, *cmd_out;
50 int err;
51
52 /* allocate object of two page for HDCP command memory and store it */
53 obj = i915_gem_object_create_shmem(i915, 2 * PAGE_SIZE);
54
55 if (IS_ERR(obj)) {
56 drm_err(&i915->drm, "Failed to allocate HDCP streaming command!\n");
57 return PTR_ERR(obj);
58 }
59
60 cmd_in = i915_gem_object_pin_map_unlocked(obj, intel_gt_coherent_map_type(gt, obj, true));
61 if (IS_ERR(cmd_in)) {
62 drm_err(&i915->drm, "Failed to map gsc message page!\n");
63 err = PTR_ERR(cmd_in);
64 goto out_unpin;
65 }
66
67 cmd_out = cmd_in + PAGE_SIZE;
68
69 vma = i915_vma_instance(obj, >->ggtt->vm, NULL);
70 if (IS_ERR(vma)) {
71 err = PTR_ERR(vma);
72 goto out_unmap;
73 }
74
75 err = i915_vma_pin(vma, 0, 0, PIN_GLOBAL | PIN_HIGH);
76 if (err)
77 goto out_unmap;
78
79 memset(cmd_in, 0, obj->base.size);
80
81 hdcp_message->hdcp_cmd_in = cmd_in;
82 hdcp_message->hdcp_cmd_out = cmd_out;
83 hdcp_message->vma = vma;
84
85 return 0;
86
87out_unmap:
88 i915_gem_object_unpin_map(obj);
89out_unpin:
90 i915_gem_object_put(obj);
91 return err;
92}
93
94static const struct i915_hdcp_ops gsc_hdcp_ops = {
95 .initiate_hdcp2_session = intel_hdcp_gsc_initiate_session,
96 .verify_receiver_cert_prepare_km =
97 intel_hdcp_gsc_verify_receiver_cert_prepare_km,
98 .verify_hprime = intel_hdcp_gsc_verify_hprime,
99 .store_pairing_info = intel_hdcp_gsc_store_pairing_info,
100 .initiate_locality_check = intel_hdcp_gsc_initiate_locality_check,
101 .verify_lprime = intel_hdcp_gsc_verify_lprime,
102 .get_session_key = intel_hdcp_gsc_get_session_key,
103 .repeater_check_flow_prepare_ack =
104 intel_hdcp_gsc_repeater_check_flow_prepare_ack,
105 .verify_mprime = intel_hdcp_gsc_verify_mprime,
106 .enable_hdcp_authentication = intel_hdcp_gsc_enable_authentication,
107 .close_hdcp_session = intel_hdcp_gsc_close_session,
108};
109
110static int intel_hdcp_gsc_hdcp2_init(struct intel_display *display)
111{
112 struct drm_i915_private *i915 = to_i915(display->drm);
113 struct intel_hdcp_gsc_message *hdcp_message;
114 int ret;
115
116 hdcp_message = kzalloc(sizeof(*hdcp_message), GFP_KERNEL);
117
118 if (!hdcp_message)
119 return -ENOMEM;
120
121 /*
122 * NOTE: No need to lock the comp mutex here as it is already
123 * going to be taken before this function called
124 */
125 display->hdcp.hdcp_message = hdcp_message;
126 ret = intel_hdcp_gsc_initialize_message(i915, hdcp_message);
127
128 if (ret)
129 drm_err(display->drm, "Could not initialize hdcp_message\n");
130
131 return ret;
132}
133
134static void intel_hdcp_gsc_free_message(struct intel_display *display)
135{
136 struct intel_hdcp_gsc_message *hdcp_message =
137 display->hdcp.hdcp_message;
138
139 hdcp_message->hdcp_cmd_in = NULL;
140 hdcp_message->hdcp_cmd_out = NULL;
141 i915_vma_unpin_and_release(&hdcp_message->vma, I915_VMA_RELEASE_MAP);
142 kfree(hdcp_message);
143}
144
145int intel_hdcp_gsc_init(struct intel_display *display)
146{
147 struct i915_hdcp_arbiter *data;
148 int ret;
149
150 data = kzalloc(sizeof(struct i915_hdcp_arbiter), GFP_KERNEL);
151 if (!data)
152 return -ENOMEM;
153
154 mutex_lock(&display->hdcp.hdcp_mutex);
155 display->hdcp.arbiter = data;
156 display->hdcp.arbiter->hdcp_dev = display->drm->dev;
157 display->hdcp.arbiter->ops = &gsc_hdcp_ops;
158 ret = intel_hdcp_gsc_hdcp2_init(display);
159 mutex_unlock(&display->hdcp.hdcp_mutex);
160
161 return ret;
162}
163
164void intel_hdcp_gsc_fini(struct intel_display *display)
165{
166 intel_hdcp_gsc_free_message(display);
167 kfree(display->hdcp.arbiter);
168}
169
170static int intel_gsc_send_sync(struct drm_i915_private *i915,
171 struct intel_gsc_mtl_header *header_in,
172 struct intel_gsc_mtl_header *header_out,
173 u64 addr_in, u64 addr_out,
174 size_t msg_out_len)
175{
176 struct intel_gt *gt = i915->media_gt;
177 int ret;
178
179 ret = intel_gsc_uc_heci_cmd_submit_packet(>->uc.gsc, addr_in,
180 header_in->message_size,
181 addr_out,
182 msg_out_len + sizeof(*header_out));
183 if (ret) {
184 drm_err(&i915->drm, "failed to send gsc HDCP msg (%d)\n", ret);
185 return ret;
186 }
187
188 /*
189 * Checking validity marker and header status to see if some error has
190 * blocked us from sending message to gsc cs
191 */
192 if (header_out->validity_marker != GSC_HECI_VALIDITY_MARKER) {
193 drm_err(&i915->drm, "invalid validity marker\n");
194 return -EINVAL;
195 }
196
197 if (header_out->status != 0) {
198 drm_err(&i915->drm, "header status indicates error %d\n",
199 header_out->status);
200 return -EINVAL;
201 }
202
203 if (header_out->flags & GSC_OUTFLAG_MSG_PENDING) {
204 header_in->gsc_message_handle = header_out->gsc_message_handle;
205 return -EAGAIN;
206 }
207
208 return 0;
209}
210
211/*
212 * This function can now be used for sending requests and will also handle
213 * receipt of reply messages hence no different function of message retrieval
214 * is required. We will initialize intel_hdcp_gsc_message structure then add
215 * gsc cs memory header as stated in specs after which the normal HDCP payload
216 * will follow
217 */
218ssize_t intel_hdcp_gsc_msg_send(struct drm_i915_private *i915, u8 *msg_in,
219 size_t msg_in_len, u8 *msg_out,
220 size_t msg_out_len)
221{
222 struct intel_gt *gt = i915->media_gt;
223 struct intel_gsc_mtl_header *header_in, *header_out;
224 const size_t max_msg_size = PAGE_SIZE - sizeof(*header_in);
225 struct intel_hdcp_gsc_message *hdcp_message;
226 u64 addr_in, addr_out, host_session_id;
227 u32 reply_size, msg_size_in, msg_size_out;
228 int ret, tries = 0;
229
230 if (!intel_uc_uses_gsc_uc(>->uc))
231 return -ENODEV;
232
233 if (msg_in_len > max_msg_size || msg_out_len > max_msg_size)
234 return -ENOSPC;
235
236 msg_size_in = msg_in_len + sizeof(*header_in);
237 msg_size_out = msg_out_len + sizeof(*header_out);
238 hdcp_message = i915->display.hdcp.hdcp_message;
239 header_in = hdcp_message->hdcp_cmd_in;
240 header_out = hdcp_message->hdcp_cmd_out;
241 addr_in = i915_ggtt_offset(hdcp_message->vma);
242 addr_out = addr_in + PAGE_SIZE;
243
244 memset(header_in, 0, msg_size_in);
245 memset(header_out, 0, msg_size_out);
246 get_random_bytes(&host_session_id, sizeof(u64));
247 intel_gsc_uc_heci_cmd_emit_mtl_header(header_in, HECI_MEADDRESS_HDCP,
248 msg_size_in, host_session_id);
249 memcpy(hdcp_message->hdcp_cmd_in + sizeof(*header_in), msg_in, msg_in_len);
250
251 /*
252 * Keep sending request in case the pending bit is set no need to add
253 * message handle as we are using same address hence loc. of header is
254 * same and it will contain the message handle. we will send the message
255 * 20 times each message 50 ms apart
256 */
257 do {
258 ret = intel_gsc_send_sync(i915, header_in, header_out, addr_in,
259 addr_out, msg_out_len);
260
261 /* Only try again if gsc says so */
262 if (ret != -EAGAIN)
263 break;
264
265 msleep(50);
266
267 } while (++tries < 20);
268
269 if (ret)
270 goto err;
271
272 /* we use the same mem for the reply, so header is in the same loc */
273 reply_size = header_out->message_size - sizeof(*header_out);
274 if (reply_size > msg_out_len) {
275 drm_warn(&i915->drm, "caller with insufficient HDCP reply size %u (%d)\n",
276 reply_size, (u32)msg_out_len);
277 reply_size = msg_out_len;
278 } else if (reply_size != msg_out_len) {
279 drm_dbg_kms(&i915->drm, "caller unexpected HCDP reply size %u (%d)\n",
280 reply_size, (u32)msg_out_len);
281 }
282
283 memcpy(msg_out, hdcp_message->hdcp_cmd_out + sizeof(*header_out), msg_out_len);
284
285err:
286 return ret;
287}