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Message-ID: <ys7j47c42uzic275e543bhq37ggpgnmfkzje3ioe6bkpntkepy@cspoldjhvgut>
Date: Tue, 21 Oct 2025 02:52:04 +0200
From: Michał Winiarski <michal.winiarski@...el.com>
To: Michal Wajdeczko <michal.wajdeczko@...el.com>
CC: Alex Williamson <alex.williamson@...hat.com>, Lucas De Marchi
<lucas.demarchi@...el.com>, Thomas Hellström
<thomas.hellstrom@...ux.intel.com>, Rodrigo Vivi <rodrigo.vivi@...el.com>,
Jason Gunthorpe <jgg@...pe.ca>, Yishai Hadas <yishaih@...dia.com>, Kevin Tian
<kevin.tian@...el.com>, Shameer Kolothum
<shameerali.kolothum.thodi@...wei.com>, <intel-xe@...ts.freedesktop.org>,
<linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>,
<dri-devel@...ts.freedesktop.org>, Matthew Brost <matthew.brost@...el.com>,
Jani Nikula <jani.nikula@...ux.intel.com>, Joonas Lahtinen
<joonas.lahtinen@...ux.intel.com>, Tvrtko Ursulin <tursulin@...ulin.net>,
David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, "Lukasz
Laguna" <lukasz.laguna@...el.com>
Subject: Re: [PATCH 16/26] drm/xe/pf: Handle GuC migration data as part of PF
control
On Mon, Oct 13, 2025 at 01:56:48PM +0200, Michal Wajdeczko wrote:
>
>
> On 10/11/2025 9:38 PM, Michał Winiarski wrote:
> > Connect the helpers to allow save and restore of GuC migration data in
> > stop_copy / resume device state.
> >
> > Signed-off-by: Michał Winiarski <michal.winiarski@...el.com>
> > ---
> > drivers/gpu/drm/xe/xe_gt_sriov_pf_control.c | 28 ++++++++++++++++++-
> > .../gpu/drm/xe/xe_gt_sriov_pf_control_types.h | 1 +
> > drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.c | 8 ++++++
> > 3 files changed, 36 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_pf_control.c b/drivers/gpu/drm/xe/xe_gt_sriov_pf_control.c
> > index 6ece775b2e80e..f73a3bf40037c 100644
> > --- a/drivers/gpu/drm/xe/xe_gt_sriov_pf_control.c
> > +++ b/drivers/gpu/drm/xe/xe_gt_sriov_pf_control.c
> > @@ -187,6 +187,7 @@ static const char *control_bit_to_string(enum xe_gt_sriov_control_bits bit)
> > CASE2STR(PAUSED);
> > CASE2STR(MIGRATION_DATA_WIP);
> > CASE2STR(SAVE_WIP);
> > + CASE2STR(SAVE_DATA_GUC);
> > CASE2STR(SAVE_FAILED);
> > CASE2STR(SAVED);
> > CASE2STR(RESTORE_WIP);
> > @@ -338,6 +339,7 @@ static void pf_exit_vf_mismatch(struct xe_gt *gt, unsigned int vfid)
> > pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_STOP_FAILED);
> > pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSE_FAILED);
> > pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_RESUME_FAILED);
> > + pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_SAVE_FAILED);
> > pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_FAILED);
> > }
> >
> > @@ -801,6 +803,7 @@ void xe_gt_sriov_pf_control_vf_data_eof(struct xe_gt *gt, unsigned int vfid)
> >
> > static void pf_exit_vf_save_wip(struct xe_gt *gt, unsigned int vfid)
> > {
> > + pf_escape_vf_state(gt, vfid, XE_GT_SRIOV_STATE_SAVE_DATA_GUC);
> > pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_SAVE_WIP);
> > }
> >
> > @@ -820,16 +823,35 @@ static void pf_exit_vf_saved(struct xe_gt *gt, unsigned int vfid)
> > pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_SAVED);
> > }
> >
> > +static void pf_enter_vf_save_failed(struct xe_gt *gt, unsigned int vfid)
> > +{
> > + pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_SAVE_FAILED);
> > + pf_exit_vf_wip(gt, vfid);
> > +}
> > +
> > static bool pf_handle_vf_save_wip(struct xe_gt *gt, unsigned int vfid)
> > {
> > + int ret;
> > +
> > if (!pf_check_vf_state(gt, vfid, XE_GT_SRIOV_STATE_SAVE_WIP))
> > return false;
> >
> > + if (pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_SAVE_DATA_GUC)) {
> > + ret = xe_gt_sriov_pf_migration_guc_save(gt, vfid);
> > + if (ret)
> > + goto err;
> > + return true;
> > + }
> > +
> > xe_gt_sriov_pf_control_vf_data_eof(gt, vfid);
> > pf_exit_vf_save_wip(gt, vfid);
> > pf_enter_vf_saved(gt, vfid);
> >
> > return true;
> > +
> > +err:
> > + pf_enter_vf_save_failed(gt, vfid);
> > + return false;
>
> return true - as this is an indication that state was processed (not that it was successful or not)
Ok.
>
> > }
> >
> > static bool pf_enter_vf_save_wip(struct xe_gt *gt, unsigned int vfid)
> > @@ -838,6 +860,8 @@ static bool pf_enter_vf_save_wip(struct xe_gt *gt, unsigned int vfid)
> > pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_MIGRATION_DATA_WIP);
> > pf_exit_vf_restored(gt, vfid);
> > pf_enter_vf_wip(gt, vfid);
> > + if (xe_gt_sriov_pf_migration_guc_size(gt, vfid) > 0)
> > + pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_SAVE_DATA_GUC);
> > pf_queue_vf(gt, vfid);
> > return true;
> > }
> > @@ -946,6 +970,8 @@ static int pf_handle_vf_restore_data(struct xe_gt *gt, unsigned int vfid,
> > struct xe_sriov_pf_migration_data *data)
> > {
> > switch (data->type) {
> > + case XE_SRIOV_MIG_DATA_GUC:
> > + return xe_gt_sriov_pf_migration_guc_restore(gt, vfid, data);
> > default:
> > xe_gt_sriov_notice(gt, "Skipping VF%u invalid data type: %d\n", vfid, data->type);
> > pf_enter_vf_restore_failed(gt, vfid);
> > @@ -996,7 +1022,7 @@ static bool pf_enter_vf_restore_wip(struct xe_gt *gt, unsigned int vfid)
> > pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_MIGRATION_DATA_WIP);
> > pf_exit_vf_saved(gt, vfid);
> > pf_enter_vf_wip(gt, vfid);
> > - pf_enter_vf_restored(gt, vfid);
> > + pf_queue_vf(gt, vfid);
> > return true;
> > }
> >
> > diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_pf_control_types.h b/drivers/gpu/drm/xe/xe_gt_sriov_pf_control_types.h
> > index 68ec9d1fc3daf..b9787c425d9f6 100644
> > --- a/drivers/gpu/drm/xe/xe_gt_sriov_pf_control_types.h
> > +++ b/drivers/gpu/drm/xe/xe_gt_sriov_pf_control_types.h
> > @@ -71,6 +71,7 @@ enum xe_gt_sriov_control_bits {
> > XE_GT_SRIOV_STATE_MIGRATION_DATA_WIP,
> >
> > XE_GT_SRIOV_STATE_SAVE_WIP,
> > + XE_GT_SRIOV_STATE_SAVE_DATA_GUC,
> > XE_GT_SRIOV_STATE_SAVE_FAILED,
> > XE_GT_SRIOV_STATE_SAVED,
> >
> > diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.c b/drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.c
> > index e1031465e65c4..0c10284f0b09a 100644
> > --- a/drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.c
> > +++ b/drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.c
> > @@ -279,9 +279,17 @@ int xe_gt_sriov_pf_migration_guc_restore(struct xe_gt *gt, unsigned int vfid,
> > ssize_t xe_gt_sriov_pf_migration_size(struct xe_gt *gt, unsigned int vfid)
> > {
> > ssize_t total = 0;
> > + ssize_t size;
> >
> > xe_gt_assert(gt, IS_SRIOV_PF(gt_to_xe(gt)));
> >
> > + size = xe_gt_sriov_pf_migration_guc_size(gt, vfid);
> > + if (size < 0)
> > + return size;
> > + else if (size > 0)
>
> no need for "else"
>
> and isn't zero GuC state size an error anyway ?
Replaced with an assert.
Thanks,
-Michał
>
> > + size += sizeof(struct xe_sriov_pf_migration_hdr);
> > + total += size;
> > +
> > return total;
> > }
> >
>
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