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1// SPDX-License-Identifier: MIT
2/*
3 * Copyright(c) 2020 Intel Corporation.
4 */
5#include <linux/workqueue.h>
6
7#include "gt/intel_gt_irq.h"
8#include "gt/intel_gt_regs.h"
9#include "gt/intel_gt_types.h"
10
11#include "i915_irq.h"
12#include "i915_reg.h"
13
14#include "intel_pxp.h"
15#include "intel_pxp_irq.h"
16#include "intel_pxp_session.h"
17#include "intel_pxp_types.h"
18#include "intel_runtime_pm.h"
19
20/**
21 * intel_pxp_irq_handler - Handles PXP interrupts.
22 * @pxp: pointer to pxp struct
23 * @iir: interrupt vector
24 */
25void intel_pxp_irq_handler(struct intel_pxp *pxp, u16 iir)
26{
27 struct intel_gt *gt;
28
29 if (GEM_WARN_ON(!intel_pxp_is_enabled(pxp)))
30 return;
31
32 gt = pxp->ctrl_gt;
33
34 lockdep_assert_held(gt->irq_lock);
35
36 if (unlikely(!iir))
37 return;
38
39 if (iir & (GEN12_DISPLAY_PXP_STATE_TERMINATED_INTERRUPT |
40 GEN12_DISPLAY_APP_TERMINATED_PER_FW_REQ_INTERRUPT)) {
41 /* immediately mark PXP as inactive on termination */
42 intel_pxp_mark_termination_in_progress(pxp);
43 pxp->session_events |= PXP_TERMINATION_REQUEST | PXP_INVAL_REQUIRED |
44 PXP_EVENT_TYPE_IRQ;
45 }
46
47 if (iir & GEN12_DISPLAY_STATE_RESET_COMPLETE_INTERRUPT)
48 pxp->session_events |= PXP_TERMINATION_COMPLETE | PXP_EVENT_TYPE_IRQ;
49
50 if (pxp->session_events)
51 queue_work(system_unbound_wq, &pxp->session_work);
52}
53
54static inline void __pxp_set_interrupts(struct intel_gt *gt, u32 interrupts)
55{
56 struct intel_uncore *uncore = gt->uncore;
57 const u32 mask = interrupts << 16;
58
59 intel_uncore_write(uncore, GEN11_CRYPTO_RSVD_INTR_ENABLE, mask);
60 intel_uncore_write(uncore, GEN11_CRYPTO_RSVD_INTR_MASK, ~mask);
61}
62
63static inline void pxp_irq_reset(struct intel_gt *gt)
64{
65 spin_lock_irq(gt->irq_lock);
66 gen11_gt_reset_one_iir(gt, 0, GEN11_KCR);
67 spin_unlock_irq(gt->irq_lock);
68}
69
70void intel_pxp_irq_enable(struct intel_pxp *pxp)
71{
72 struct intel_gt *gt = pxp->ctrl_gt;
73
74 spin_lock_irq(gt->irq_lock);
75
76 if (!pxp->irq_enabled)
77 WARN_ON_ONCE(gen11_gt_reset_one_iir(gt, 0, GEN11_KCR));
78
79 __pxp_set_interrupts(gt, GEN12_PXP_INTERRUPTS);
80 pxp->irq_enabled = true;
81
82 spin_unlock_irq(gt->irq_lock);
83}
84
85void intel_pxp_irq_disable(struct intel_pxp *pxp)
86{
87 struct intel_gt *gt = pxp->ctrl_gt;
88
89 /*
90 * We always need to submit a global termination when we re-enable the
91 * interrupts, so there is no need to make sure that the session state
92 * makes sense at the end of this function. Just make sure this is not
93 * called in a path were the driver consider the session as valid and
94 * doesn't call a termination on restart.
95 */
96 GEM_WARN_ON(intel_pxp_is_active(pxp));
97
98 spin_lock_irq(gt->irq_lock);
99
100 pxp->irq_enabled = false;
101 __pxp_set_interrupts(gt, 0);
102
103 spin_unlock_irq(gt->irq_lock);
104 intel_synchronize_irq(gt->i915);
105
106 pxp_irq_reset(gt);
107
108 flush_work(&pxp->session_work);
109}