[PATCH v5 2/2] drm/xe: remove GuC reload in D3Hot path
Riana Tauro
riana.tauro at intel.com
Fri Aug 2 06:21:37 UTC 2024
Hi Matthew, Michal
Thank you for the review comments
On 8/2/2024 2:32 AM, Matthew Brost wrote:
> On Thu, Aug 01, 2024 at 10:55:07PM +0200, Michal Wajdeczko wrote:
>>
>>
>> On 01.08.2024 22:42, Matthew Brost wrote:
>>> On Thu, Aug 01, 2024 at 11:29:41AM +0530, Riana Tauro wrote:
>>>> Currently GuC is reloaded for both runtime resume and system resume.
>>>> For D3hot <-> D0 transitions no power is lost during suspend so GuC reload
>>>> is not necessary.
>>>>
>>>> Remove GuC reload from D3Hot path and only enable/disable CTB
>>>> communication.
>>>>
>>>> v2: rebase
>>>>
>>>> v3: fix commit message
>>>> add kernel-doc for gt suspend and resume methods
>>>> fix comment
>>>> do not split register and enable calls of CT (Michal)
>>>>
>>>> v4: fix commit message
>>>> fix comment (Karthik)
>>>> split patches
>>>> correct kernel-doc (Rodrigo)
>>>>
>>>> v5: do not expose internal function of CT layer (Michal)
>>>> remove wait for outstanding g2h as it will be always zero,
>>>> use assert instead (Matthew Brost)
>>>> use runtime suspend and runtime resume pair for CT layer
>>>> (Michal / Matthew Brost)
>>>>
>>>> Signed-off-by: Riana Tauro <riana.tauro at intel.com>
>>>> ---
>>>> drivers/gpu/drm/xe/xe_gt.c | 33 +++++++++++++++++++++++++++++----
>>>> drivers/gpu/drm/xe/xe_gt.h | 4 ++--
>>>> drivers/gpu/drm/xe/xe_guc.c | 30 ++++++++++++++++++++++++++++++
>>>> drivers/gpu/drm/xe/xe_guc.h | 2 ++
>>>> drivers/gpu/drm/xe/xe_guc_ct.c | 31 +++++++++++++++++++++++++++++++
>>>> drivers/gpu/drm/xe/xe_guc_ct.h | 3 +++
>>>> drivers/gpu/drm/xe/xe_pm.c | 8 ++++----
>>>> drivers/gpu/drm/xe/xe_uc.c | 28 ++++++++++++++++++++++++++++
>>>> drivers/gpu/drm/xe/xe_uc.h | 2 ++
>>>> 9 files changed, 131 insertions(+), 10 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/xe/xe_gt.c b/drivers/gpu/drm/xe/xe_gt.c
>>>> index 58895ed22f6e..e0b13dc7663b 100644
>>>> --- a/drivers/gpu/drm/xe/xe_gt.c
>>>> +++ b/drivers/gpu/drm/xe/xe_gt.c
>>>> @@ -831,8 +831,16 @@ void xe_gt_suspend_prepare(struct xe_gt *gt)
>>>> XE_WARN_ON(xe_force_wake_put(gt_to_fw(gt), XE_FORCEWAKE_ALL));
>>>> }
>>>>
>>>> -int xe_gt_suspend(struct xe_gt *gt)
>>>> +/**
>>>> + * xe_gt_suspend - GT suspend helper
>>>> + * @gt: GT object
>>>> + * @runtime: true if this is from runtime suspend
>>>> + *
>>>> + * Return: 0 on success, negative error code otherwise.
>>>> + */
>>>> +int xe_gt_suspend(struct xe_gt *gt, bool runtime)
>>>> {
>>>> + struct xe_device *xe = gt_to_xe(gt);
>>>> int err;
>>>>
>>>> xe_gt_dbg(gt, "suspending\n");
>>>> @@ -842,7 +850,11 @@ int xe_gt_suspend(struct xe_gt *gt)
>>>> if (err)
>>>> goto err_msg;
>>>>
>>>> - err = xe_uc_suspend(>->uc);
>>>> + if (runtime && !xe->d3cold.allowed)
>>>> + err = xe_uc_runtime_suspend(>->uc);
>>>> + else
>>>> + err = xe_uc_suspend(>->uc);
>>>> +
>>>> if (err)
>>>> goto err_force_wake;
>>>>
>>>> @@ -881,8 +893,16 @@ int xe_gt_sanitize_freq(struct xe_gt *gt)
>>>> return ret;
>>>> }
>>>>
>>>> -int xe_gt_resume(struct xe_gt *gt)
>>>> +/**
>>>> + * xe_gt_resume - GT resume helper
>>>> + * @gt: GT object
>>>> + * @runtime: true if called on runtime resume
>>>> + *
>>>> + * Return: 0 on success, negative error code otherwise.
>>>> + */
>>>> +int xe_gt_resume(struct xe_gt *gt, bool runtime)
>>>> {
>>>> + struct xe_device *xe = gt_to_xe(gt);
>>>> int err;
>>>>
>>>> xe_gt_dbg(gt, "resuming\n");
>>>> @@ -890,7 +910,12 @@ int xe_gt_resume(struct xe_gt *gt)
>>>> if (err)
>>>> goto err_msg;
>>>>
>>>> - err = do_gt_restart(gt);
>>>> + /* GuC is still alive at D3hot, no need to reload it */
>>>> + if (runtime && !xe->d3cold.allowed)
>>>> + xe_uc_runtime_resume(>->uc);
>>>> + else
>>>> + err = do_gt_restart(gt);
>>>> +
>>>> if (err)
>>>> goto err_force_wake;
>>>>
>>>> diff --git a/drivers/gpu/drm/xe/xe_gt.h b/drivers/gpu/drm/xe/xe_gt.h
>>>> index 8b1a5027dcf2..21f27ca23b67 100644
>>>> --- a/drivers/gpu/drm/xe/xe_gt.h
>>>> +++ b/drivers/gpu/drm/xe/xe_gt.h
>>>> @@ -53,8 +53,8 @@ int xe_gt_record_default_lrcs(struct xe_gt *gt);
>>>> void xe_gt_record_user_engines(struct xe_gt *gt);
>>>>
>>>> void xe_gt_suspend_prepare(struct xe_gt *gt);
>>>> -int xe_gt_suspend(struct xe_gt *gt);
>>>> -int xe_gt_resume(struct xe_gt *gt);
>>>> +int xe_gt_suspend(struct xe_gt *gt, bool runtime);
>>>> +int xe_gt_resume(struct xe_gt *gt, bool runtime);
>>>> void xe_gt_reset_async(struct xe_gt *gt);
>>>> void xe_gt_sanitize(struct xe_gt *gt);
>>>> int xe_gt_sanitize_freq(struct xe_gt *gt);
>>>> diff --git a/drivers/gpu/drm/xe/xe_guc.c b/drivers/gpu/drm/xe/xe_guc.c
>>>> index 1ff49318f001..e1923a00a9f6 100644
>>>> --- a/drivers/gpu/drm/xe/xe_guc.c
>>>> +++ b/drivers/gpu/drm/xe/xe_guc.c
>>>> @@ -881,6 +881,8 @@ int xe_guc_enable_communication(struct xe_guc *guc, bool register_ctb)
>>>>
>>>> if (register_ctb)
>>>> err = xe_guc_ct_enable(&guc->ct);
>>>> + else
>>>> + xe_guc_ct_runtime_resume(&guc->ct);
>>>>
>>>> if (err)
>>>> return err;
>>>> @@ -1112,6 +1114,34 @@ void xe_guc_sanitize(struct xe_guc *guc)
>>>> guc->submission_state.enabled = false;
>>>> }
>>>>
>>>> +/**
>>>> + * xe_guc_runtime_suspend - GuC runtime suspend
>>>> + * @guc: GuC object
>>>> + *
>>>> + * Return: 0 on success, negative error code otherwise.
>>>> + */
>>>> +int xe_guc_runtime_suspend(struct xe_guc *guc)
>>>> +{
>>>> + return xe_guc_ct_runtime_suspend(&guc->ct);
>>>> +}
>>>> +
>>>> +/**
>>>> + * xe_guc_runtime_resume - GuC runtime resume
>>>> + * @guc: GuC object
>>>> + *
>>>> + * This function enables GuC CTB communication
>>>> + */
>>>> +void xe_guc_runtime_resume(struct xe_guc *guc)
>>>> +{
>>>> + /*
>>>> + * Power is not lost when in D3Hot state,
>>>> + * hence it is not necessary to reload GuC
>>>> + * everytime. Only enable interrupts and
>>>> + * CTB communication during resume
>>>> + */
>>>> + xe_guc_enable_communication(guc, false);
>>>> +}
>>>> +
>>>> int xe_guc_reset_prepare(struct xe_guc *guc)
>>>> {
>>>> return xe_guc_submit_reset_prepare(guc);
>>>> diff --git a/drivers/gpu/drm/xe/xe_guc.h b/drivers/gpu/drm/xe/xe_guc.h
>>>> index 13e75573f7d0..ddc87798e176 100644
>>>> --- a/drivers/gpu/drm/xe/xe_guc.h
>>>> +++ b/drivers/gpu/drm/xe/xe_guc.h
>>>> @@ -22,6 +22,8 @@ int xe_guc_upload(struct xe_guc *guc);
>>>> int xe_guc_min_load_for_hwconfig(struct xe_guc *guc);
>>>> int xe_guc_enable_communication(struct xe_guc *guc, bool register_ctb);
>>>> int xe_guc_suspend(struct xe_guc *guc);
>>>> +int xe_guc_runtime_suspend(struct xe_guc *guc);
>>>> +void xe_guc_runtime_resume(struct xe_guc *guc);
>>>> void xe_guc_notify(struct xe_guc *guc);
>>>> int xe_guc_auth_huc(struct xe_guc *guc, u32 rsa_addr);
>>>> int xe_guc_mmio_send(struct xe_guc *guc, const u32 *request, u32 len);
>>>> diff --git a/drivers/gpu/drm/xe/xe_guc_ct.c b/drivers/gpu/drm/xe/xe_guc_ct.c
>>>> index beeeb120d1fc..9e42c5d29971 100644
>>>> --- a/drivers/gpu/drm/xe/xe_guc_ct.c
>>>> +++ b/drivers/gpu/drm/xe/xe_guc_ct.c
>>>> @@ -419,6 +419,37 @@ int xe_guc_ct_enable(struct xe_guc_ct *ct)
>>>> return err;
>>>> }
>>>>
>>>> +/**
>>>> + * xe_guc_ct_runtime_resume- GuC CT runtime resume
>>>> + * @ct: the &xe_guc_ct
>>>> + *
>>>> + * Mark GuC CT as enabled on runtime resume
>>>> + */
>>>> +void xe_guc_ct_runtime_resume(struct xe_guc_ct *ct)
>>>> +{
>>>
>>> I'd assert here g2h head and tail are equal in memory to ensure we know
>>> we are doing with the PM as we shouldn't have any g2h on runtime resume
>>> if we have the PM correct. If they are unequal, this isn't fatal just
>>> kick the g2h handler.
>>>
>
>
> Based on Michals feedback below, I guess we xe_gt_WARN_ON here too for
> g2h head / tail check + fallback to kick the g2h handler.
>
Sure will add this
>>>> + xe_guc_ct_set_state(ct, XE_GUC_CT_STATE_ENABLED);
>>>> +}
>>>> +
>>>> +/**
>>>> + * xe_guc_ct_runtime_suspend- GuC CT runtime suspend
>>>> + * @ct: the &xe_guc_ct
>>>> + *
>>>> + * Mark GuC CT as disabled on runtime suspend
>>>> + *
>>>> + * Return: 0 on success, negative error code otherwise
>>>> + */
>>>> +int xe_guc_ct_runtime_suspend(struct xe_guc_ct *ct)
>>>> +{
>>>
>>> Nit, I'd write it like this:
>>>
>>> xe_gt_assert(ct_to_gt(ct), !ct->g2h_outstanding);
>>> if (ct->g2h_outstanding)
>>> return -EBUSY;
>>
>> IMO neither option is good as xe_assert() is not to be used where you
>> plan to use fallback path [1] you may want to use xe_gt_WARN_ON instead
>>
>
> So like:
>
> if (xe_gt_WARN_ON(ct_to_gt(ct), ct->g2h_outstanding))
> return -EBUSY;
>
> Yea, that is probably better.
>
Will make this change
Thanks,
Riana
> Matt
>
>> Michal
>>
>> [1] https://docs.kernel.org/gpu/xe/xe_debugging.html
>>
>>>
>>> Matt
>>>
>>>> + if (ct->g2h_outstanding) {
>>>> + xe_gt_assert(ct_to_gt(ct), !ct->g2h_outstanding);
>>>> + return -EBUSY;
>>>> + }
>>>> +
>>>> + xe_guc_ct_disable(ct);
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>> static void stop_g2h_handler(struct xe_guc_ct *ct)
>>>> {
>>>> cancel_work_sync(&ct->g2h_worker);
>>>> diff --git a/drivers/gpu/drm/xe/xe_guc_ct.h b/drivers/gpu/drm/xe/xe_guc_ct.h
>>>> index 190202fce2d0..0cf9d77feb35 100644
>>>> --- a/drivers/gpu/drm/xe/xe_guc_ct.h
>>>> +++ b/drivers/gpu/drm/xe/xe_guc_ct.h
>>>> @@ -16,6 +16,9 @@ void xe_guc_ct_disable(struct xe_guc_ct *ct);
>>>> void xe_guc_ct_stop(struct xe_guc_ct *ct);
>>>> void xe_guc_ct_fast_path(struct xe_guc_ct *ct);
>>>>
>>>> +void xe_guc_ct_runtime_resume(struct xe_guc_ct *ct);
>>>> +int xe_guc_ct_runtime_suspend(struct xe_guc_ct *ct);
>>>> +
>>>> struct xe_guc_ct_snapshot *
>>>> xe_guc_ct_snapshot_capture(struct xe_guc_ct *ct, bool atomic);
>>>> void xe_guc_ct_snapshot_print(struct xe_guc_ct_snapshot *snapshot,
>>>> diff --git a/drivers/gpu/drm/xe/xe_pm.c b/drivers/gpu/drm/xe/xe_pm.c
>>>> index 9f3c14fd9f33..c73a728a7450 100644
>>>> --- a/drivers/gpu/drm/xe/xe_pm.c
>>>> +++ b/drivers/gpu/drm/xe/xe_pm.c
>>>> @@ -101,7 +101,7 @@ int xe_pm_suspend(struct xe_device *xe)
>>>> xe_display_pm_suspend(xe, false);
>>>>
>>>> for_each_gt(gt, xe, id) {
>>>> - err = xe_gt_suspend(gt);
>>>> + err = xe_gt_suspend(gt, false);
>>>> if (err) {
>>>> xe_display_pm_resume(xe, false);
>>>> goto err;
>>>> @@ -157,7 +157,7 @@ int xe_pm_resume(struct xe_device *xe)
>>>> xe_display_pm_resume(xe, false);
>>>>
>>>> for_each_gt(gt, xe, id)
>>>> - xe_gt_resume(gt);
>>>> + xe_gt_resume(gt, false);
>>>>
>>>> err = xe_bo_restore_user(xe);
>>>> if (err)
>>>> @@ -374,7 +374,7 @@ int xe_pm_runtime_suspend(struct xe_device *xe)
>>>> }
>>>>
>>>> for_each_gt(gt, xe, id) {
>>>> - err = xe_gt_suspend(gt);
>>>> + err = xe_gt_suspend(gt, true);
>>>> if (err)
>>>> goto out;
>>>> }
>>>> @@ -428,7 +428,7 @@ int xe_pm_runtime_resume(struct xe_device *xe)
>>>> xe_irq_resume(xe);
>>>>
>>>> for_each_gt(gt, xe, id)
>>>> - xe_gt_resume(gt);
>>>> + xe_gt_resume(gt, true);
>>>>
>>>> if (xe->d3cold.allowed) {
>>>> xe_display_pm_resume(xe, true);
>>>> diff --git a/drivers/gpu/drm/xe/xe_uc.c b/drivers/gpu/drm/xe/xe_uc.c
>>>> index fa98e9f22631..8e535153cc62 100644
>>>> --- a/drivers/gpu/drm/xe/xe_uc.c
>>>> +++ b/drivers/gpu/drm/xe/xe_uc.c
>>>> @@ -288,6 +288,34 @@ int xe_uc_suspend(struct xe_uc *uc)
>>>> return xe_guc_suspend(&uc->guc);
>>>> }
>>>>
>>>> +/**
>>>> + * xe_uc_runtime_suspend - uC runtime suspend
>>>> + * @uc: uC object
>>>> + *
>>>> + * Return: 0 on success, negative error code otherwise
>>>> + */
>>>> +int xe_uc_runtime_suspend(struct xe_uc *uc)
>>>> +{
>>>> + if (!xe_device_uc_enabled(uc_to_xe(uc)))
>>>> + return 0;
>>>> +
>>>> + return xe_guc_runtime_suspend(&uc->guc);
>>>> +}
>>>> +
>>>> +/**
>>>> + * xe_uc_runtime_resume - uC runtime resume
>>>> + * @uc: uC object
>>>> + *
>>>> + * Called while resuming from D3Hot
>>>> + */
>>>> +void xe_uc_runtime_resume(struct xe_uc *uc)
>>>> +{
>>>> + if (!xe_device_uc_enabled(uc_to_xe(uc)))
>>>> + return;
>>>> +
>>>> + xe_guc_runtime_resume(&uc->guc);
>>>> +}
>>>> +
>>>> /**
>>>> * xe_uc_remove() - Clean up the UC structures before driver removal
>>>> * @uc: the UC object
>>>> diff --git a/drivers/gpu/drm/xe/xe_uc.h b/drivers/gpu/drm/xe/xe_uc.h
>>>> index 506517c11333..1e223d67086a 100644
>>>> --- a/drivers/gpu/drm/xe/xe_uc.h
>>>> +++ b/drivers/gpu/drm/xe/xe_uc.h
>>>> @@ -15,6 +15,8 @@ int xe_uc_init_hw(struct xe_uc *uc);
>>>> int xe_uc_fini_hw(struct xe_uc *uc);
>>>> void xe_uc_gucrc_disable(struct xe_uc *uc);
>>>> int xe_uc_reset_prepare(struct xe_uc *uc);
>>>> +int xe_uc_runtime_suspend(struct xe_uc *uc);
>>>> +void xe_uc_runtime_resume(struct xe_uc *uc);
>>>> void xe_uc_stop_prepare(struct xe_uc *uc);
>>>> void xe_uc_stop(struct xe_uc *uc);
>>>> int xe_uc_start(struct xe_uc *uc);
>>>> --
>>>> 2.40.0
>>>>
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