diff options
Diffstat (limited to 'drivers/gpu/drm/i915/pxp/intel_pxp_session.c')
| -rw-r--r-- | drivers/gpu/drm/i915/pxp/intel_pxp_session.c | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_session.c b/drivers/gpu/drm/i915/pxp/intel_pxp_session.c new file mode 100644 index 000000000..1bb5b5249 --- /dev/null +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_session.c @@ -0,0 +1,174 @@ +// 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(gt->irq_lock); + events = fetch_and_zero(&pxp->session_events); + spin_unlock_irq(gt->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); +} |