On Wed, Sep 15, 2021 at 08:11:54AM -0700, Daniele Ceraolo Spurio wrote:
>
>
> On 9/14/2021 12:13 PM, Rodrigo Vivi wrote:
> > On Fri, Sep 10, 2021 at 08:36:22AM -0700, Daniele Ceraolo Spurio wrote:
> > > From: "Huang, Sean Z" <sean.z.huang@xxxxxxxxx>
> > >
> > > During the power event S3+ sleep/resume, hardware will lose all the
> > > encryption keys for every hardware session, even though the
> > > session state might still be marked as alive after resume. Therefore,
> > > we should consider the session as dead on suspend and invalidate all the
> > > objects. The session will be automatically restarted on the first
> > > protected submission on resume.
> > >
> > > v2: runtime suspend also invalidates the keys
> > > v3: fix return codes, simplify rpm ops (Chris), use the new worker func
> > > v4: invalidate the objects on suspend, don't re-create the arb sesson on
> > > resume (delayed to first submission).
> > > v5: move irq changes back to irq patch (Rodrigo)
> > > v6: drop invalidation in runtime suspend (Rodrigo)
> > >
> > > Signed-off-by: Huang, Sean Z <sean.z.huang@xxxxxxxxx>
> > > Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
> > > Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> > > Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
> > ops, I had missed this patch. Sorry
> > and thanks Alan for the ping.
> >
> > > ---
> > > drivers/gpu/drm/i915/Makefile | 1 +
> > > drivers/gpu/drm/i915/gt/intel_gt_pm.c | 15 ++++++-
> > > drivers/gpu/drm/i915/i915_drv.c | 2 +
> > > drivers/gpu/drm/i915/pxp/intel_pxp_irq.c | 1 +
> > > drivers/gpu/drm/i915/pxp/intel_pxp_pm.c | 46 ++++++++++++++++++++
> > > drivers/gpu/drm/i915/pxp/intel_pxp_pm.h | 23 ++++++++++
> > > drivers/gpu/drm/i915/pxp/intel_pxp_session.c | 38 +++++++++++-----
> > > drivers/gpu/drm/i915/pxp/intel_pxp_tee.c | 9 ++++
> > > 8 files changed, 124 insertions(+), 11 deletions(-)
> > > create mode 100644 drivers/gpu/drm/i915/pxp/intel_pxp_pm.c
> > > create mode 100644 drivers/gpu/drm/i915/pxp/intel_pxp_pm.h
> > >
> > > diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> > > index b22b8c195bb8..366e82cec44d 100644
> > > --- a/drivers/gpu/drm/i915/Makefile
> > > +++ b/drivers/gpu/drm/i915/Makefile
> > > @@ -286,6 +286,7 @@ i915-$(CONFIG_DRM_I915_PXP) += \
> > > pxp/intel_pxp.o \
> > > pxp/intel_pxp_cmd.o \
> > > pxp/intel_pxp_irq.o \
> > > + pxp/intel_pxp_pm.o \
> > > pxp/intel_pxp_session.o \
> > > pxp/intel_pxp_tee.o
> > > diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.c b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
> > > index dea8e2479897..b47a8d8f1bb5 100644
> > > --- a/drivers/gpu/drm/i915/gt/intel_gt_pm.c
> > > +++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
> > > @@ -18,6 +18,7 @@
> > > #include "intel_rc6.h"
> > > #include "intel_rps.h"
> > > #include "intel_wakeref.h"
> > > +#include "pxp/intel_pxp_pm.h"
> > > static void user_forcewake(struct intel_gt *gt, bool suspend)
> > > {
> > > @@ -262,6 +263,8 @@ int intel_gt_resume(struct intel_gt *gt)
> > > intel_uc_resume(>->uc);
> > > + intel_pxp_resume(>->pxp);
> > > +
> > > user_forcewake(gt, false);
> > > out_fw:
> > > @@ -296,6 +299,7 @@ void intel_gt_suspend_prepare(struct intel_gt *gt)
> > > user_forcewake(gt, true);
> > > wait_for_suspend(gt);
> > > + intel_pxp_suspend(>->pxp, false);
> > > intel_uc_suspend(>->uc);
> > > }
> > > @@ -346,6 +350,7 @@ void intel_gt_suspend_late(struct intel_gt *gt)
> > > void intel_gt_runtime_suspend(struct intel_gt *gt)
> > > {
> > > + intel_pxp_suspend(>->pxp, true);
> > We should actually remove this from here
>
> No we shouldn't. The PXP suspend does other things in addition to the
> invalidation (e.g. marking the ARB session as invalid) and those must be
> performed, otherwise the SW state won't match the HW. That's why I added a
> variable instead of dropping the call. Similar for the resume.
Why? We are blocking the runtime PM. This functions will never be called anyway...
>
> Daniele
>
> >
> > > intel_uc_runtime_suspend(>->uc);
> > > GT_TRACE(gt, "\n");
> > > @@ -353,11 +358,19 @@ void intel_gt_runtime_suspend(struct intel_gt *gt)
> > > int intel_gt_runtime_resume(struct intel_gt *gt)
> > > {
> > > + int ret;
> > > +
> > > GT_TRACE(gt, "\n");
> > > intel_gt_init_swizzling(gt);
> > > intel_ggtt_restore_fences(gt->ggtt);
> > > - return intel_uc_runtime_resume(>->uc);
> > > + ret = intel_uc_runtime_resume(>->uc);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + intel_pxp_resume(>->pxp);
> > And from here...
> >
> > > +
> > > + return 0;
> > > }
> > > static ktime_t __intel_gt_get_awake_time(const struct intel_gt *gt)
> > > diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> > > index 59fb4c710c8c..d5bcc70a22d4 100644
> > > --- a/drivers/gpu/drm/i915/i915_drv.c
> > > +++ b/drivers/gpu/drm/i915/i915_drv.c
> > > @@ -67,6 +67,8 @@
> > > #include "gt/intel_gt_pm.h"
> > > #include "gt/intel_rc6.h"
> > > +#include "pxp/intel_pxp_pm.h"
> > > +
> > > #include "i915_debugfs.h"
> > > #include "i915_drv.h"
> > > #include "i915_ioc32.h"
> > > diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_irq.c b/drivers/gpu/drm/i915/pxp/intel_pxp_irq.c
> > > index 340f20d130a8..9e5847c653f2 100644
> > > --- a/drivers/gpu/drm/i915/pxp/intel_pxp_irq.c
> > > +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_irq.c
> > > @@ -9,6 +9,7 @@
> > > #include "gt/intel_gt_irq.h"
> > > #include "i915_irq.h"
> > > #include "i915_reg.h"
> > > +#include "intel_runtime_pm.h"
> > > /**
> > > * intel_pxp_irq_handler - Handles PXP interrupts.
> > > diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_pm.c b/drivers/gpu/drm/i915/pxp/intel_pxp_pm.c
> > > new file mode 100644
> > > index 000000000000..23fd86de5a24
> > > --- /dev/null
> > > +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_pm.c
> > > @@ -0,0 +1,46 @@
> > > +// SPDX-License-Identifier: MIT
> > > +/*
> > > + * Copyright(c) 2020 Intel Corporation.
> > > + */
> > > +
> > > +#include "intel_pxp.h"
> > > +#include "intel_pxp_irq.h"
> > > +#include "intel_pxp_pm.h"
> > > +#include "intel_pxp_session.h"
> > > +
> > > +void intel_pxp_suspend(struct intel_pxp *pxp, bool runtime)
> > > +{
> > > + if (!intel_pxp_is_enabled(pxp))
> > > + return;
> > > +
> > > + pxp->arb_is_valid = false;
> > > +
> > > + /*
> > > + * Contexts using protected objects keep a runtime PM reference, so we
> > > + * can only runtime suspend when all of them have been either closed
> > > + * or banned. Therefore, there is no need to invalidate in that
> > > + * scenario.
> > > + */
> > and remove this comment
> >
> > > + if (!runtime)
> > and remove the runtime boolean entirely.
> >
> > > + intel_pxp_invalidate(pxp);
> > > +
> > > + intel_pxp_fini_hw(pxp);
> > > +
> > > + pxp->hw_state_invalidated = false;
> > > +}
> > > +
> > > +void intel_pxp_resume(struct intel_pxp *pxp)
> > > +{
> > > + if (!intel_pxp_is_enabled(pxp))
> > > + return;
> > > +
> > > + /*
> > > + * The PXP component gets automatically unbound when we go into S3 and
> > > + * re-bound after we come out, so in that scenario we can defer the
> > > + * hw init to the bind call.
> > > + */
> > > + if (!pxp->pxp_component)
> > > + return;
> > > +
> > > + intel_pxp_init_hw(pxp);
> > > +}
> > > diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_pm.h b/drivers/gpu/drm/i915/pxp/intel_pxp_pm.h
> > > new file mode 100644
> > > index 000000000000..e6a357996e19
> > > --- /dev/null
> > > +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_pm.h
> > > @@ -0,0 +1,23 @@
> > > +/* SPDX-License-Identifier: MIT */
> > > +/*
> > > + * Copyright(c) 2020, Intel Corporation. All rights reserved.
> > > + */
> > > +
> > > +#ifndef __INTEL_PXP_PM_H__
> > > +#define __INTEL_PXP_PM_H__
> > > +
> > > +#include "i915_drv.h"
> > > +
> > > +#ifdef CONFIG_DRM_I915_PXP
> > > +void intel_pxp_suspend(struct intel_pxp *pxp, bool runtime);
> > > +void intel_pxp_resume(struct intel_pxp *pxp);
> > > +#else
> > > +static inline void intel_pxp_suspend(struct intel_pxp *pxp, bool runtime)
> > > +{
> > > +}
> > > +static inline void intel_pxp_resume(struct intel_pxp *pxp)
> > > +{
> > > +}
> > > +#endif
> > > +
> > > +#endif /* __INTEL_PXP_PM_H__ */
> > > diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_session.c b/drivers/gpu/drm/i915/pxp/intel_pxp_session.c
> > > index a95cc443a48d..d02732f04757 100644
> > > --- a/drivers/gpu/drm/i915/pxp/intel_pxp_session.c
> > > +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_session.c
> > > @@ -21,29 +21,36 @@
> > > static bool intel_pxp_session_is_in_play(struct intel_pxp *pxp, u32 id)
> > > {
> > > - struct intel_gt *gt = pxp_to_gt(pxp);
> > > + struct intel_uncore *uncore = pxp_to_gt(pxp)->uncore;
> > > intel_wakeref_t wakeref;
> > > u32 sip = 0;
> > > - with_intel_runtime_pm(gt->uncore->rpm, wakeref)
> > > - sip = intel_uncore_read(gt->uncore, GEN12_KCR_SIP);
> > > + /* 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_gt *gt = pxp_to_gt(pxp);
> > > + struct intel_uncore *uncore = pxp_to_gt(pxp)->uncore;
> > > 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);
> > > + /* 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;
> > > }
> > > @@ -135,6 +142,7 @@ 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(>->irq_lock);
> > > @@ -147,6 +155,14 @@ void intel_pxp_session_work(struct work_struct *work)
> > > 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);
> > > @@ -154,4 +170,6 @@ void intel_pxp_session_work(struct work_struct *work)
> > > if (events & PXP_TERMINATION_COMPLETE)
> > > pxp_terminate_complete(pxp);
> > > +
> > > + intel_runtime_pm_put(gt->uncore->rpm, wakeref);
> > > }
> > > diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c b/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c
> > > index 3fc3ddfd02b3..49508f31dcb7 100644
> > > --- a/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c
> > > +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c
> > > @@ -78,16 +78,25 @@ static int intel_pxp_tee_io_message(struct intel_pxp *pxp,
> > > static int i915_pxp_tee_component_bind(struct device *i915_kdev,
> > > struct device *tee_kdev, void *data)
> > > {
> > > + struct drm_i915_private *i915 = kdev_to_i915(i915_kdev);
> > > struct intel_pxp *pxp = i915_dev_to_pxp(i915_kdev);
> > > + intel_wakeref_t wakeref;
> > > mutex_lock(&pxp->tee_mutex);
> > > pxp->pxp_component = data;
> > > pxp->pxp_component->tee_dev = tee_kdev;
> > > mutex_unlock(&pxp->tee_mutex);
> > > + /* if we are suspended, the HW will be re-initialized on resume */
> > > + wakeref = intel_runtime_pm_get_if_in_use(&i915->runtime_pm);
> > > + if (!wakeref)
> > > + return 0;
> > > +
> > > /* the component is required to fully start the PXP HW */
> > > intel_pxp_init_hw(pxp);
> > > + intel_runtime_pm_put(&i915->runtime_pm, wakeref);
> > > +
> > > return 0;
> > > }
> > > --
> > > 2.25.1
> > >
>
