intel_pxp_session.c (4243B)
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 21static 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 34static 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 57static 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 89static 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 115static 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 131static 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 140void 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(>->irq_lock); 148 events = fetch_and_zero(&pxp->session_events); 149 spin_unlock_irq(>->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}