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