1 // SPDX-License-Identifier: MIT
2 /*
3 * Copyright(c) 2020, Intel Corporation. All rights reserved.
4 */
5
6 #include "i915_drv.h"
7
8 #include "intel_pxp.h"
9 #include "intel_pxp_cmd.h"
10 #include "intel_pxp_session.h"
11 #include "intel_pxp_tee.h"
12 #include "intel_pxp_types.h"
13
14 #define ARB_SESSION I915_PROTECTED_CONTENT_DEFAULT_SESSION /* shorter define */
15
16 #define GEN12_KCR_SIP _MMIO(0x32260) /* KCR hwdrm session in play 0-31 */
17
18 /* PXP global terminate register for session termination */
19 #define PXP_GLOBAL_TERMINATE _MMIO(0x320f8)
20
intel_pxp_session_is_in_play(struct intel_pxp * pxp,u32 id)21 static bool intel_pxp_session_is_in_play(struct intel_pxp *pxp, u32 id)
22 {
23 struct intel_uncore *uncore = pxp_to_gt(pxp)->uncore;
24 intel_wakeref_t wakeref;
25 u32 sip = 0;
26
27 /* if we're suspended the session is considered off */
28 with_intel_runtime_pm_if_in_use(uncore->rpm, wakeref)
29 sip = intel_uncore_read(uncore, GEN12_KCR_SIP);
30
31 return sip & BIT(id);
32 }
33
pxp_wait_for_session_state(struct intel_pxp * pxp,u32 id,bool in_play)34 static int pxp_wait_for_session_state(struct intel_pxp *pxp, u32 id, bool in_play)
35 {
36 struct intel_uncore *uncore = pxp_to_gt(pxp)->uncore;
37 intel_wakeref_t wakeref;
38 u32 mask = BIT(id);
39 int ret;
40
41 /* if we're suspended the session is considered off */
42 wakeref = intel_runtime_pm_get_if_in_use(uncore->rpm);
43 if (!wakeref)
44 return in_play ? -ENODEV : 0;
45
46 ret = intel_wait_for_register(uncore,
47 GEN12_KCR_SIP,
48 mask,
49 in_play ? mask : 0,
50 100);
51
52 intel_runtime_pm_put(uncore->rpm, wakeref);
53
54 return ret;
55 }
56
pxp_create_arb_session(struct intel_pxp * pxp)57 static int pxp_create_arb_session(struct intel_pxp *pxp)
58 {
59 struct intel_gt *gt = pxp_to_gt(pxp);
60 int ret;
61
62 pxp->arb_is_valid = false;
63
64 if (intel_pxp_session_is_in_play(pxp, ARB_SESSION)) {
65 drm_err(>->i915->drm, "arb session already in play at creation time\n");
66 return -EEXIST;
67 }
68
69 ret = intel_pxp_tee_cmd_create_arb_session(pxp, ARB_SESSION);
70 if (ret) {
71 drm_err(>->i915->drm, "tee cmd for arb session creation failed\n");
72 return ret;
73 }
74
75 ret = pxp_wait_for_session_state(pxp, ARB_SESSION, true);
76 if (ret) {
77 drm_err(>->i915->drm, "arb session failed to go in play\n");
78 return ret;
79 }
80
81 if (!++pxp->key_instance)
82 ++pxp->key_instance;
83
84 pxp->arb_is_valid = true;
85
86 return 0;
87 }
88
pxp_terminate_arb_session_and_global(struct intel_pxp * pxp)89 static int pxp_terminate_arb_session_and_global(struct intel_pxp *pxp)
90 {
91 int ret;
92 struct intel_gt *gt = pxp_to_gt(pxp);
93
94 /* must mark termination in progress calling this function */
95 GEM_WARN_ON(pxp->arb_is_valid);
96
97 /* terminate the hw sessions */
98 ret = intel_pxp_terminate_session(pxp, ARB_SESSION);
99 if (ret) {
100 drm_err(>->i915->drm, "Failed to submit session termination\n");
101 return ret;
102 }
103
104 ret = pxp_wait_for_session_state(pxp, ARB_SESSION, false);
105 if (ret) {
106 drm_err(>->i915->drm, "Session state did not clear\n");
107 return ret;
108 }
109
110 intel_uncore_write(gt->uncore, PXP_GLOBAL_TERMINATE, 1);
111
112 return ret;
113 }
114
pxp_terminate(struct intel_pxp * pxp)115 static void pxp_terminate(struct intel_pxp *pxp)
116 {
117 int ret;
118
119 pxp->hw_state_invalidated = true;
120
121 /*
122 * if we fail to submit the termination there is no point in waiting for
123 * it to complete. PXP will be marked as non-active until the next
124 * termination is issued.
125 */
126 ret = pxp_terminate_arb_session_and_global(pxp);
127 if (ret)
128 complete_all(&pxp->termination);
129 }
130
pxp_terminate_complete(struct intel_pxp * pxp)131 static void pxp_terminate_complete(struct intel_pxp *pxp)
132 {
133 /* Re-create the arb session after teardown handle complete */
134 if (fetch_and_zero(&pxp->hw_state_invalidated))
135 pxp_create_arb_session(pxp);
136
137 complete_all(&pxp->termination);
138 }
139
intel_pxp_session_work(struct work_struct * work)140 void intel_pxp_session_work(struct work_struct *work)
141 {
142 struct intel_pxp *pxp = container_of(work, typeof(*pxp), session_work);
143 struct intel_gt *gt = pxp_to_gt(pxp);
144 intel_wakeref_t wakeref;
145 u32 events = 0;
146
147 spin_lock_irq(gt->irq_lock);
148 events = fetch_and_zero(&pxp->session_events);
149 spin_unlock_irq(gt->irq_lock);
150
151 if (!events)
152 return;
153
154 if (events & PXP_INVAL_REQUIRED)
155 intel_pxp_invalidate(pxp);
156
157 /*
158 * If we're processing an event while suspending then don't bother,
159 * we're going to re-init everything on resume anyway.
160 */
161 wakeref = intel_runtime_pm_get_if_in_use(gt->uncore->rpm);
162 if (!wakeref)
163 return;
164
165 if (events & PXP_TERMINATION_REQUEST) {
166 events &= ~PXP_TERMINATION_COMPLETE;
167 pxp_terminate(pxp);
168 }
169
170 if (events & PXP_TERMINATION_COMPLETE)
171 pxp_terminate_complete(pxp);
172
173 intel_runtime_pm_put(gt->uncore->rpm, wakeref);
174 }
175