tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: MIT
2/*
3 * Copyright 2023, Intel Corporation.
4 */
5
6#include <drm/drm_print.h>
7#include <drm/intel/i915_hdcp_interface.h>
8#include <linux/delay.h>
9
10#include "abi/gsc_command_header_abi.h"
11#include "intel_hdcp_gsc.h"
12#include "xe_bo.h"
13#include "xe_device.h"
14#include "xe_device_types.h"
15#include "xe_force_wake.h"
16#include "xe_gsc_proxy.h"
17#include "xe_gsc_submit.h"
18#include "xe_map.h"
19#include "xe_pm.h"
20#include "xe_uc_fw.h"
21
22#define HECI_MEADDRESS_HDCP 18
23
24struct intel_hdcp_gsc_context {
25 struct xe_device *xe;
26 struct xe_bo *hdcp_bo;
27 u64 hdcp_cmd_in;
28 u64 hdcp_cmd_out;
29};
30
31#define HDCP_GSC_HEADER_SIZE sizeof(struct intel_gsc_mtl_header)
32
33bool intel_hdcp_gsc_check_status(struct drm_device *drm)
34{
35 struct xe_device *xe = to_xe_device(drm);
36 struct xe_tile *tile = xe_device_get_root_tile(xe);
37 struct xe_gt *gt = tile->media_gt;
38 struct xe_gsc *gsc = >->uc.gsc;
39 bool ret = true;
40 unsigned int fw_ref;
41
42 if (!gsc || !xe_uc_fw_is_enabled(&gsc->fw)) {
43 drm_dbg_kms(&xe->drm,
44 "GSC Components not ready for HDCP2.x\n");
45 return false;
46 }
47
48 xe_pm_runtime_get(xe);
49 fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FW_GSC);
50 if (!fw_ref) {
51 drm_dbg_kms(&xe->drm,
52 "failed to get forcewake to check proxy status\n");
53 ret = false;
54 goto out;
55 }
56
57 if (!xe_gsc_proxy_init_done(gsc))
58 ret = false;
59
60 xe_force_wake_put(gt_to_fw(gt), fw_ref);
61out:
62 xe_pm_runtime_put(xe);
63 return ret;
64}
65
66/*This function helps allocate memory for the command that we will send to gsc cs */
67static int intel_hdcp_gsc_initialize_message(struct xe_device *xe,
68 struct intel_hdcp_gsc_context *gsc_context)
69{
70 struct xe_bo *bo = NULL;
71 u64 cmd_in, cmd_out;
72 int ret = 0;
73
74 /* allocate object of two page for HDCP command memory and store it */
75 bo = xe_bo_create_pin_map_novm(xe, xe_device_get_root_tile(xe), PAGE_SIZE * 2,
76 ttm_bo_type_kernel,
77 XE_BO_FLAG_SYSTEM |
78 XE_BO_FLAG_GGTT, false);
79
80 if (IS_ERR(bo)) {
81 drm_err(&xe->drm, "Failed to allocate bo for HDCP streaming command!\n");
82 ret = PTR_ERR(bo);
83 goto out;
84 }
85
86 cmd_in = xe_bo_ggtt_addr(bo);
87 cmd_out = cmd_in + PAGE_SIZE;
88 xe_map_memset(xe, &bo->vmap, 0, 0, xe_bo_size(bo));
89
90 gsc_context->hdcp_bo = bo;
91 gsc_context->hdcp_cmd_in = cmd_in;
92 gsc_context->hdcp_cmd_out = cmd_out;
93 gsc_context->xe = xe;
94
95out:
96 return ret;
97}
98
99struct intel_hdcp_gsc_context *intel_hdcp_gsc_context_alloc(struct drm_device *drm)
100{
101 struct xe_device *xe = to_xe_device(drm);
102 struct intel_hdcp_gsc_context *gsc_context;
103 int ret;
104
105 gsc_context = kzalloc(sizeof(*gsc_context), GFP_KERNEL);
106 if (!gsc_context)
107 return ERR_PTR(-ENOMEM);
108
109 /*
110 * NOTE: No need to lock the comp mutex here as it is already
111 * going to be taken before this function called
112 */
113 ret = intel_hdcp_gsc_initialize_message(xe, gsc_context);
114 if (ret) {
115 drm_err(&xe->drm, "Could not initialize gsc_context\n");
116 kfree(gsc_context);
117 gsc_context = ERR_PTR(ret);
118 }
119
120 return gsc_context;
121}
122
123void intel_hdcp_gsc_context_free(struct intel_hdcp_gsc_context *gsc_context)
124{
125 if (!gsc_context)
126 return;
127
128 xe_bo_unpin_map_no_vm(gsc_context->hdcp_bo);
129 kfree(gsc_context);
130}
131
132static int xe_gsc_send_sync(struct xe_device *xe,
133 struct intel_hdcp_gsc_context *gsc_context,
134 u32 msg_size_in, u32 msg_size_out,
135 u32 addr_out_off)
136{
137 struct xe_gt *gt = gsc_context->hdcp_bo->tile->media_gt;
138 struct iosys_map *map = &gsc_context->hdcp_bo->vmap;
139 struct xe_gsc *gsc = >->uc.gsc;
140 int ret;
141
142 ret = xe_gsc_pkt_submit_kernel(gsc, gsc_context->hdcp_cmd_in, msg_size_in,
143 gsc_context->hdcp_cmd_out, msg_size_out);
144 if (ret) {
145 drm_err(&xe->drm, "failed to send gsc HDCP msg (%d)\n", ret);
146 return ret;
147 }
148
149 if (xe_gsc_check_and_update_pending(xe, map, 0, map, addr_out_off))
150 return -EAGAIN;
151
152 ret = xe_gsc_read_out_header(xe, map, addr_out_off,
153 sizeof(struct hdcp_cmd_header), NULL);
154
155 return ret;
156}
157
158ssize_t intel_hdcp_gsc_msg_send(struct intel_hdcp_gsc_context *gsc_context,
159 void *msg_in, size_t msg_in_len,
160 void *msg_out, size_t msg_out_len)
161{
162 struct xe_device *xe = gsc_context->xe;
163 const size_t max_msg_size = PAGE_SIZE - HDCP_GSC_HEADER_SIZE;
164 u64 host_session_id;
165 u32 msg_size_in, msg_size_out;
166 u32 addr_out_off, addr_in_wr_off = 0;
167 int ret, tries = 0;
168
169 if (msg_in_len > max_msg_size || msg_out_len > max_msg_size) {
170 ret = -ENOSPC;
171 goto out;
172 }
173
174 msg_size_in = msg_in_len + HDCP_GSC_HEADER_SIZE;
175 msg_size_out = msg_out_len + HDCP_GSC_HEADER_SIZE;
176 addr_out_off = PAGE_SIZE;
177
178 host_session_id = xe_gsc_create_host_session_id();
179 xe_pm_runtime_get_noresume(xe);
180 addr_in_wr_off = xe_gsc_emit_header(xe, &gsc_context->hdcp_bo->vmap,
181 addr_in_wr_off, HECI_MEADDRESS_HDCP,
182 host_session_id, msg_in_len);
183 xe_map_memcpy_to(xe, &gsc_context->hdcp_bo->vmap, addr_in_wr_off,
184 msg_in, msg_in_len);
185 /*
186 * Keep sending request in case the pending bit is set no need to add
187 * message handle as we are using same address hence loc. of header is
188 * same and it will contain the message handle. we will send the message
189 * 20 times each message 50 ms apart
190 */
191 do {
192 ret = xe_gsc_send_sync(xe, gsc_context, msg_size_in, msg_size_out,
193 addr_out_off);
194
195 /* Only try again if gsc says so */
196 if (ret != -EAGAIN)
197 break;
198
199 msleep(50);
200
201 } while (++tries < 20);
202
203 if (ret)
204 goto out;
205
206 xe_map_memcpy_from(xe, msg_out, &gsc_context->hdcp_bo->vmap,
207 addr_out_off + HDCP_GSC_HEADER_SIZE,
208 msg_out_len);
209
210out:
211 xe_pm_runtime_put(xe);
212 return ret;
213}