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
|
// SPDX-License-Identifier: MIT
/*
* Copyright(c) 2020, Intel Corporation. All rights reserved.
*/
#include "i915_drv.h"
#include "intel_pxp.h"
#include "intel_pxp_cmd.h"
#include "intel_pxp_session.h"
#include "intel_pxp_tee.h"
#include "intel_pxp_types.h"
#define ARB_SESSION I915_PROTECTED_CONTENT_DEFAULT_SESSION /* shorter define */
#define GEN12_KCR_SIP _MMIO(0x32260) /* KCR hwdrm session in play 0-31 */
/* PXP global terminate register for session termination */
#define PXP_GLOBAL_TERMINATE _MMIO(0x320f8)
static bool intel_pxp_session_is_in_play(struct intel_pxp *pxp, u32 id)
{
struct intel_uncore *uncore = pxp_to_gt(pxp)->uncore;
intel_wakeref_t wakeref;
u32 sip = 0;
/* if we're suspended the session is considered off */
with_intel_runtime_pm_if_in_use(uncore->rpm, wakeref)
sip = intel_uncore_read(uncore, GEN12_KCR_SIP);
return sip & BIT(id);
}
static int pxp_wait_for_session_state(struct intel_pxp *pxp, u32 id, bool in_play)
{
struct intel_uncore *uncore = pxp_to_gt(pxp)->uncore;
intel_wakeref_t wakeref;
u32 mask = BIT(id);
int ret;
/* if we're suspended the session is considered off */
wakeref = intel_runtime_pm_get_if_in_use(uncore->rpm);
if (!wakeref)
return in_play ? -ENODEV : 0;
ret = intel_wait_for_register(uncore,
GEN12_KCR_SIP,
mask,
in_play ? mask : 0,
100);
intel_runtime_pm_put(uncore->rpm, wakeref);
return ret;
}
static int pxp_create_arb_session(struct intel_pxp *pxp)
{
struct intel_gt *gt = pxp_to_gt(pxp);
int ret;
pxp->arb_is_valid = false;
if (intel_pxp_session_is_in_play(pxp, ARB_SESSION)) {
drm_err(>->i915->drm, "arb session already in play at creation time\n");
return -EEXIST;
}
ret = intel_pxp_tee_cmd_create_arb_session(pxp, ARB_SESSION);
if (ret) {
drm_err(>->i915->drm, "tee cmd for arb session creation failed\n");
return ret;
}
ret = pxp_wait_for_session_state(pxp, ARB_SESSION, true);
if (ret) {
drm_err(>->i915->drm, "arb session failed to go in play\n");
return ret;
}
if (!++pxp->key_instance)
++pxp->key_instance;
pxp->arb_is_valid = true;
return 0;
}
static int pxp_terminate_arb_session_and_global(struct intel_pxp *pxp)
{
int ret;
struct intel_gt *gt = pxp_to_gt(pxp);
/* must mark termination in progress calling this function */
GEM_WARN_ON(pxp->arb_is_valid);
/* terminate the hw sessions */
ret = intel_pxp_terminate_session(pxp, ARB_SESSION);
if (ret) {
drm_err(>->i915->drm, "Failed to submit session termination\n");
return ret;
}
ret = pxp_wait_for_session_state(pxp, ARB_SESSION, false);
if (ret) {
drm_err(>->i915->drm, "Session state did not clear\n");
return ret;
}
intel_uncore_write(gt->uncore, PXP_GLOBAL_TERMINATE, 1);
return ret;
}
static void pxp_terminate(struct intel_pxp *pxp)
{
int ret;
pxp->hw_state_invalidated = true;
/*
* if we fail to submit the termination there is no point in waiting for
* it to complete. PXP will be marked as non-active until the next
* termination is issued.
*/
ret = pxp_terminate_arb_session_and_global(pxp);
if (ret)
complete_all(&pxp->termination);
}
static void pxp_terminate_complete(struct intel_pxp *pxp)
{
/* Re-create the arb session after teardown handle complete */
if (fetch_and_zero(&pxp->hw_state_invalidated))
pxp_create_arb_session(pxp);
complete_all(&pxp->termination);
}
void intel_pxp_session_work(struct work_struct *work)
{
struct intel_pxp *pxp = container_of(work, typeof(*pxp), session_work);
struct intel_gt *gt = pxp_to_gt(pxp);
intel_wakeref_t wakeref;
u32 events = 0;
spin_lock_irq(>->irq_lock);
events = fetch_and_zero(&pxp->session_events);
spin_unlock_irq(>->irq_lock);
if (!events)
return;
if (events & PXP_INVAL_REQUIRED)
intel_pxp_invalidate(pxp);
/*
* If we're processing an event while suspending then don't bother,
* we're going to re-init everything on resume anyway.
*/
wakeref = intel_runtime_pm_get_if_in_use(gt->uncore->rpm);
if (!wakeref)
return;
if (events & PXP_TERMINATION_REQUEST) {
events &= ~PXP_TERMINATION_COMPLETE;
pxp_terminate(pxp);
}
if (events & PXP_TERMINATION_COMPLETE)
pxp_terminate_complete(pxp);
intel_runtime_pm_put(gt->uncore->rpm, wakeref);
}
|
