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// 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_gsccs.h"
#include "intel_pxp_session.h"
#include "intel_pxp_tee.h"
#include "intel_pxp_types.h"
#include "intel_pxp_regs.h"
#define ARB_SESSION I915_PROTECTED_CONTENT_DEFAULT_SESSION /* shorter define */
static bool intel_pxp_session_is_in_play(struct intel_pxp *pxp, u32 id)
{
struct intel_uncore *uncore = pxp->ctrl_gt->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, KCR_SIP(pxp->kcr_base));
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->ctrl_gt->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,
KCR_SIP(pxp->kcr_base),
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->ctrl_gt;
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;
}
if (HAS_ENGINE(pxp->ctrl_gt, GSC0))
ret = intel_pxp_gsccs_create_session(pxp, ARB_SESSION);
else
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_dbg(>->i915->drm, "arb session failed to go in play\n");
return ret;
}
drm_dbg(>->i915->drm, "PXP ARB session is alive\n");
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->ctrl_gt;
/* 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, KCR_GLOBAL_TERMINATE(pxp->kcr_base), 1);
if (HAS_ENGINE(gt, GSC0))
intel_pxp_gsccs_end_arb_fw_session(pxp, ARB_SESSION);
else
intel_pxp_tee_end_arb_fw_session(pxp, ARB_SESSION);
return ret;
}
void intel_pxp_terminate(struct intel_pxp *pxp, bool post_invalidation_needs_restart)
{
int ret;
pxp->hw_state_invalidated = post_invalidation_needs_restart;
/*
* 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);
}
static void pxp_session_work(struct work_struct *work)
{
struct intel_pxp *pxp = container_of(work, typeof(*pxp), session_work);
struct intel_gt *gt = pxp->ctrl_gt;
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;
intel_pxp_terminate(pxp, true);
}
if (events & PXP_TERMINATION_COMPLETE)
pxp_terminate_complete(pxp);
intel_runtime_pm_put(gt->uncore->rpm, wakeref);
}
void intel_pxp_session_management_init(struct intel_pxp *pxp)
{
mutex_init(&pxp->arb_mutex);
INIT_WORK(&pxp->session_work, pxp_session_work);
}
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