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// SPDX-License-Identifier: MIT
/*
* Copyright(c) 2020, Intel Corporation. All rights reserved.
*/
#include "drm/i915_drm.h"
#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_gt *gt = pxp_to_gt(pxp);
intel_wakeref_t wakeref;
u32 sip = 0;
with_intel_runtime_pm(gt->uncore->rpm, wakeref)
sip = intel_uncore_read(gt->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_gt *gt = pxp_to_gt(pxp);
intel_wakeref_t wakeref;
u32 mask = BIT(id);
int ret;
with_intel_runtime_pm(gt->uncore->rpm, wakeref)
ret = intel_wait_for_register(gt->uncore,
GEN12_KCR_SIP,
mask,
in_play ? mask : 0,
100);
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);
u32 events = 0;
spin_lock_irq(>->irq_lock);
events = fetch_and_zero(&pxp->session_events);
spin_unlock_irq(>->irq_lock);
if (!events)
return;
if (events & PXP_INVAL_REQUIRED)
intel_pxp_invalidate(pxp);
if (events & PXP_TERMINATION_REQUEST) {
events &= ~PXP_TERMINATION_COMPLETE;
pxp_terminate(pxp);
}
if (events & PXP_TERMINATION_COMPLETE)
pxp_terminate_complete(pxp);
}
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