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Message-ID: <53bec38f-ec3f-4ce3-bd7e-e9e230663c48@intel.com>
Date: Sun, 12 Oct 2025 22:09:41 +0200
From: Michal Wajdeczko <michal.wajdeczko@...el.com>
To: Michał Winiarski <michal.winiarski@...el.com>, "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>
CC: <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 03/26] drm/xe/pf: Add save/restore control state stubs and
connect to debugfs
On 10/11/2025 9:38 PM, Michał Winiarski wrote:
> The states will be used by upcoming changes to produce (in case of save)
> or consume (in case of resume) the VF migration data.
>
> Signed-off-by: Michał Winiarski <michal.winiarski@...el.com>
> ---
> drivers/gpu/drm/xe/xe_gt_sriov_pf_control.c | 270 ++++++++++++++++++
> drivers/gpu/drm/xe/xe_gt_sriov_pf_control.h | 6 +
> .../gpu/drm/xe/xe_gt_sriov_pf_control_types.h | 17 ++
> drivers/gpu/drm/xe/xe_sriov_pf_control.c | 96 +++++++
> drivers/gpu/drm/xe/xe_sriov_pf_control.h | 4 +
> drivers/gpu/drm/xe/xe_sriov_pf_debugfs.c | 38 +++
> 6 files changed, 431 insertions(+)
>
> 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 2e6bd3d1fe1da..44df984278548 100644
> --- a/drivers/gpu/drm/xe/xe_gt_sriov_pf_control.c
> +++ b/drivers/gpu/drm/xe/xe_gt_sriov_pf_control.c
> @@ -184,6 +184,13 @@ static const char *control_bit_to_string(enum xe_gt_sriov_control_bits bit)
> CASE2STR(PAUSE_SAVE_GUC);
> CASE2STR(PAUSE_FAILED);
> CASE2STR(PAUSED);
> + CASE2STR(MIGRATION_DATA_WIP);
> + CASE2STR(SAVE_WIP);
> + CASE2STR(SAVE_FAILED);
> + CASE2STR(SAVED);
> + CASE2STR(RESTORE_WIP);
> + CASE2STR(RESTORE_FAILED);
> + CASE2STR(RESTORED);
> CASE2STR(RESUME_WIP);
> CASE2STR(RESUME_SEND_RESUME);
> CASE2STR(RESUME_FAILED);
> @@ -207,6 +214,8 @@ static unsigned long pf_get_default_timeout(enum xe_gt_sriov_control_bits bit)
> return HZ / 2;
> case XE_GT_SRIOV_STATE_FLR_WIP:
> case XE_GT_SRIOV_STATE_FLR_RESET_CONFIG:
> + case XE_GT_SRIOV_STATE_SAVE_WIP:
> + case XE_GT_SRIOV_STATE_RESTORE_WIP:
> return 5 * HZ;
> default:
> return HZ;
> @@ -359,6 +368,10 @@ static void pf_queue_vf(struct xe_gt *gt, unsigned int vfid)
>
> static void pf_exit_vf_flr_wip(struct xe_gt *gt, unsigned int vfid);
> static void pf_exit_vf_stop_wip(struct xe_gt *gt, unsigned int vfid);
> +static void pf_exit_vf_save_wip(struct xe_gt *gt, unsigned int vfid);
> +static void pf_exit_vf_saved(struct xe_gt *gt, unsigned int vfid);
> +static void pf_exit_vf_restore_wip(struct xe_gt *gt, unsigned int vfid);
> +static void pf_exit_vf_restored(struct xe_gt *gt, unsigned int vfid);
> static void pf_exit_vf_pause_wip(struct xe_gt *gt, unsigned int vfid);
> static void pf_exit_vf_resume_wip(struct xe_gt *gt, unsigned int vfid);
>
> @@ -380,6 +393,8 @@ static void pf_exit_vf_wip(struct xe_gt *gt, unsigned int vfid)
>
> pf_exit_vf_flr_wip(gt, vfid);
> pf_exit_vf_stop_wip(gt, vfid);
> + pf_exit_vf_save_wip(gt, vfid);
> + pf_exit_vf_restore_wip(gt, vfid);
> pf_exit_vf_pause_wip(gt, vfid);
> pf_exit_vf_resume_wip(gt, vfid);
>
> @@ -399,6 +414,8 @@ static void pf_enter_vf_ready(struct xe_gt *gt, unsigned int vfid)
> pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSED);
> pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_STOPPED);
> pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_RESUMED);
> + pf_exit_vf_saved(gt, vfid);
> + pf_exit_vf_restored(gt, vfid);
> pf_exit_vf_mismatch(gt, vfid);
> pf_exit_vf_wip(gt, vfid);
> }
> @@ -675,6 +692,8 @@ static void pf_enter_vf_resumed(struct xe_gt *gt, unsigned int vfid)
> {
> pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_RESUMED);
> pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSED);
> + pf_exit_vf_saved(gt, vfid);
> + pf_exit_vf_restored(gt, vfid);
> pf_exit_vf_mismatch(gt, vfid);
> pf_exit_vf_wip(gt, vfid);
> }
> @@ -776,6 +795,249 @@ int xe_gt_sriov_pf_control_resume_vf(struct xe_gt *gt, unsigned int vfid)
> return -ECANCELED;
> }
>
> +/**
> + * xe_gt_sriov_pf_control_check_vf_data_wip - check if new SR-IOV VF migration data is expected
nit: add () to function name:
xe_gt_sriov_pf_control_check_vf_data_wip() - Check ...
> + * @gt: the &struct xe_gt
> + * @vfid: the VF identifier
> + *
> + * This function is for PF only.
> + *
> + * Return: true when new migration data is expected to be produced, false otherwise
> + */
> +bool xe_gt_sriov_pf_control_check_vf_data_wip(struct xe_gt *gt, unsigned int vfid)
> +{
> + return pf_check_vf_state(gt, vfid, XE_GT_SRIOV_STATE_MIGRATION_DATA_WIP);
> +}
> +
> +static void pf_exit_vf_save_wip(struct xe_gt *gt, unsigned int vfid)
> +{
> + pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_SAVE_WIP);
> +}
> +
> +static void pf_enter_vf_saved(struct xe_gt *gt, unsigned int vfid)
> +{
> + if (!pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_SAVED))
> + pf_enter_vf_state_machine_bug(gt, vfid);
> +
> + xe_gt_sriov_info(gt, "VF%u saved!\n", vfid);
> +
> + pf_exit_vf_mismatch(gt, vfid);
> + pf_exit_vf_wip(gt, vfid);
> +}
> +
> +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 bool pf_handle_vf_save_wip(struct xe_gt *gt, unsigned int vfid)
> +{
> + if (!pf_check_vf_state(gt, vfid, XE_GT_SRIOV_STATE_SAVE_WIP))
> + return false;
> +
> + pf_exit_vf_save_wip(gt, vfid);
> + pf_enter_vf_saved(gt, vfid);
> +
> + return true;
> +}
> +
> +static bool pf_enter_vf_save_wip(struct xe_gt *gt, unsigned int vfid)
> +{
> + if (pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_SAVE_WIP)) {
> + 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);
> + pf_queue_vf(gt, vfid);
> + return true;
> + }
> +
> + return false;
> +}
> +
please add diagram for the inner state machines for both new SAVE/RESTORE states
and also update master diagram how SAVE/RESTORE interacts with existing states
with diagrams that include expected flows it will be easier to review the impl
> +/**
> + * xe_gt_sriov_pf_control_save_vf - Save SR-IOV VF migration data.
> + * @gt: the &struct xe_gt
> + * @vfid: the VF identifier
> + *
> + * This function is for PF only.
> + *
> + * Return: 0 on success or a negative error code on failure.
> + */
> +int xe_gt_sriov_pf_control_save_vf(struct xe_gt *gt, unsigned int vfid)
> +{
> + if (pf_check_vf_state(gt, vfid, XE_GT_SRIOV_STATE_STOPPED)) {
> + xe_gt_sriov_dbg(gt, "VF%u is stopped!\n", vfid);
> + return -EPERM;
> + }
> +
> + if (!pf_check_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSED)) {
> + xe_gt_sriov_dbg(gt, "VF%u is not paused!\n", vfid);
> + return -EPERM;
> + }
> +
> + if (pf_check_vf_state(gt, vfid, XE_GT_SRIOV_STATE_RESTORE_WIP)) {
> + xe_gt_sriov_dbg(gt, "VF%u restore is in progress!\n", vfid);
> + return -EPERM;
> + }
> +
> + if (!pf_enter_vf_save_wip(gt, vfid)) {
> + xe_gt_sriov_dbg(gt, "VF%u save already in progress!\n", vfid);
> + return -EALREADY;
> + }
> +
> + return 0;
> +}
> +
> +static int pf_wait_vf_save_done(struct xe_gt *gt, unsigned int vfid)
> +{
> + unsigned long timeout = pf_get_default_timeout(XE_GT_SRIOV_STATE_SAVE_WIP);
> + int err;
> +
> + err = pf_wait_vf_wip_done(gt, vfid, timeout);
> + if (err) {
> + xe_gt_sriov_notice(gt, "VF%u SAVE didn't finish in %u ms (%pe)\n",
> + vfid, jiffies_to_msecs(timeout), ERR_PTR(err));
> + return err;
> + }
> +
> + if (!pf_expect_vf_not_state(gt, vfid, XE_GT_SRIOV_STATE_SAVE_FAILED))
> + return -EIO;
> +
> + return 0;
> +}
> +
> +/**
> + * xe_gt_sriov_pf_control_wait_save_done() - Wait for a VF Save to complete
> + * @gt: the &struct xe_gt
> + * @vfid: the VF identifier
> + *
> + * This function is for PF only.
> + *
> + * Return: 0 on success or a negative error code on failure.
> + */
> +int xe_gt_sriov_pf_control_wait_save_done(struct xe_gt *gt, unsigned int vfid)
> +{
> + if (!pf_check_vf_state(gt, vfid, XE_GT_SRIOV_STATE_SAVE_WIP))
> + return 0;
> +
> + return pf_wait_vf_save_done(gt, vfid);
> +}
> +
> +static void pf_exit_vf_restore_wip(struct xe_gt *gt, unsigned int vfid)
> +{
> + pf_expect_vf_not_state(gt, vfid, XE_GT_SRIOV_STATE_MIGRATION_DATA_WIP);
> + pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_RESTORE_WIP);
> +}
> +
> +static void pf_enter_vf_restored(struct xe_gt *gt, unsigned int vfid)
> +{
> + if (!pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_RESTORED))
> + pf_enter_vf_state_machine_bug(gt, vfid);
> +
> + xe_gt_sriov_info(gt, "VF%u restored!\n", vfid);
since commit ac43294e8ec2 for GT-level state changes we use dbg() messages
> +
> + pf_exit_vf_mismatch(gt, vfid);
> + pf_exit_vf_wip(gt, vfid);
> +}
> +
> +static void pf_exit_vf_restored(struct xe_gt *gt, unsigned int vfid)
> +{
> + pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_RESTORED);
> +}
> +
> +static bool pf_handle_vf_restore_wip(struct xe_gt *gt, unsigned int vfid)
> +{
> + if (!pf_check_vf_state(gt, vfid, XE_GT_SRIOV_STATE_RESTORE_WIP))
> + return false;
> +
> + pf_exit_vf_restore_wip(gt, vfid);
> + pf_enter_vf_restored(gt, vfid);
> +
> + return true;
> +}
> +
> +static bool pf_enter_vf_restore_wip(struct xe_gt *gt, unsigned int vfid)
> +{
> + if (pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_RESTORE_WIP)) {
> + 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);
> + return true;
> + }
> +
> + return false;
> +}
> +
> +/**
> + * xe_gt_sriov_pf_control_restore_vf - Restore SR-IOV VF migration data.
> + * @gt: the &struct xe_gt
> + * @vfid: the VF identifier
> + *
> + * This function is for PF only.
> + *
> + * Return: 0 on success or a negative error code on failure.
> + */
> +int xe_gt_sriov_pf_control_restore_vf(struct xe_gt *gt, unsigned int vfid)
> +{
> + if (pf_check_vf_state(gt, vfid, XE_GT_SRIOV_STATE_STOPPED)) {
> + xe_gt_sriov_dbg(gt, "VF%u is stopped!\n", vfid);
> + return -EPERM;
> + }
> +
> + if (!pf_check_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSED)) {
> + xe_gt_sriov_dbg(gt, "VF%u is not paused!\n", vfid);
> + return -EPERM;
> + }
> +
> + if (pf_check_vf_state(gt, vfid, XE_GT_SRIOV_STATE_SAVE_WIP)) {
> + xe_gt_sriov_dbg(gt, "VF%u save is in progress!\n", vfid);
> + return -EPERM;
> + }
> +
> + if (!pf_enter_vf_restore_wip(gt, vfid)) {
> + xe_gt_sriov_dbg(gt, "VF%u restore already in progress!\n", vfid);
> + return -EALREADY;
> + }
> +
> + return 0;
> +}
> +
> +static int pf_wait_vf_restore_done(struct xe_gt *gt, unsigned int vfid)
> +{
> + unsigned long timeout = pf_get_default_timeout(XE_GT_SRIOV_STATE_RESTORE_WIP);
> + int err;
> +
> + err = pf_wait_vf_wip_done(gt, vfid, timeout);
> + if (err) {
> + xe_gt_sriov_notice(gt, "VF%u RESTORE didn't finish in %u ms (%pe)\n",
> + vfid, jiffies_to_msecs(timeout), ERR_PTR(err));
> + return err;
> + }
> +
> + if (!pf_expect_vf_not_state(gt, vfid, XE_GT_SRIOV_STATE_RESTORE_FAILED))
> + return -EIO;
> +
> + return 0;
> +}
> +
> +/**
> + * xe_gt_sriov_pf_control_wait_restore_done() - Wait for a VF Restore to complete
> + * @gt: the &struct xe_gt
> + * @vfid: the VF identifier
> + *
> + * This function is for PF only.
> + *
> + * Return: 0 on success or a negative error code on failure.
> + */
> +int xe_gt_sriov_pf_control_wait_restore_done(struct xe_gt *gt, unsigned int vfid)
> +{
> + if (!pf_check_vf_state(gt, vfid, XE_GT_SRIOV_STATE_RESTORE_WIP))
> + return 0;
> +
> + return pf_wait_vf_restore_done(gt, vfid);
> +}
> +
> /**
> * DOC: The VF STOP state machine
> *
> @@ -817,6 +1079,8 @@ static void pf_enter_vf_stopped(struct xe_gt *gt, unsigned int vfid)
>
> pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_RESUMED);
> pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSED);
> + pf_exit_vf_saved(gt, vfid);
> + pf_exit_vf_restored(gt, vfid);
> pf_exit_vf_mismatch(gt, vfid);
> pf_exit_vf_wip(gt, vfid);
> }
> @@ -1461,6 +1725,12 @@ static bool pf_process_vf_state_machine(struct xe_gt *gt, unsigned int vfid)
> if (pf_exit_vf_pause_save_guc(gt, vfid))
> return true;
>
> + if (pf_handle_vf_save_wip(gt, vfid))
> + return true;
> +
> + if (pf_handle_vf_restore_wip(gt, vfid))
> + return true;
> +
> if (pf_exit_vf_resume_send_resume(gt, vfid))
> return true;
>
> diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_pf_control.h b/drivers/gpu/drm/xe/xe_gt_sriov_pf_control.h
> index 8a72ef3778d47..2e121e8132dcf 100644
> --- a/drivers/gpu/drm/xe/xe_gt_sriov_pf_control.h
> +++ b/drivers/gpu/drm/xe/xe_gt_sriov_pf_control.h
> @@ -14,8 +14,14 @@ struct xe_gt;
> int xe_gt_sriov_pf_control_init(struct xe_gt *gt);
> void xe_gt_sriov_pf_control_restart(struct xe_gt *gt);
>
> +bool xe_gt_sriov_pf_control_check_vf_data_wip(struct xe_gt *gt, unsigned int vfid);
> +
> int xe_gt_sriov_pf_control_pause_vf(struct xe_gt *gt, unsigned int vfid);
> int xe_gt_sriov_pf_control_resume_vf(struct xe_gt *gt, unsigned int vfid);
> +int xe_gt_sriov_pf_control_save_vf(struct xe_gt *gt, unsigned int vfid);
> +int xe_gt_sriov_pf_control_wait_save_done(struct xe_gt *gt, unsigned int vfid);
> +int xe_gt_sriov_pf_control_restore_vf(struct xe_gt *gt, unsigned int vfid);
> +int xe_gt_sriov_pf_control_wait_restore_done(struct xe_gt *gt, unsigned int vfid);
> int xe_gt_sriov_pf_control_stop_vf(struct xe_gt *gt, unsigned int vfid);
> int xe_gt_sriov_pf_control_trigger_flr(struct xe_gt *gt, unsigned int vfid);
> int xe_gt_sriov_pf_control_sync_flr(struct xe_gt *gt, unsigned int vfid, bool sync);
> 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 c80b7e77f1ad2..02b517533ee8a 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
> @@ -31,6 +31,13 @@
> * @XE_GT_SRIOV_STATE_PAUSE_SAVE_GUC: indicates that the PF needs to save the VF GuC state.
> * @XE_GT_SRIOV_STATE_PAUSE_FAILED: indicates that a VF pause operation has failed.
> * @XE_GT_SRIOV_STATE_PAUSED: indicates that the VF is paused.
> + * @XE_GT_SRIOV_STATE_MIGRATION_DATA_WIP: indicates that the new data is expected in migration ring.
hmm, that looks like a wrong optimization, likely we should have separate:
> + * @XE_GT_SRIOV_STATE_SAVE_WIP: indicates that VF save operation is in progress.
XE_GT_SRIOV_STATE_SAVE_WAIT_DATA - indicates that the new SAVE data is expected
> + * @XE_GT_SRIOV_STATE_SAVE_FAILED: indicates that VF save operation has failed.
> + * @XE_GT_SRIOV_STATE_SAVED: indicates that VF is saved.
> + * @XE_GT_SRIOV_STATE_RESTORE_WIP: indicates that VF restore operation is in progress.
and
XE_GT_SRIOV_STATE_RESTORE_WAIT_DATA - indicates that the new RESTORE data is expected
> + * @XE_GT_SRIOV_STATE_SAVE_FAILED: indicates that VF restore operation has failed.
> + * @XE_GT_SRIOV_STATE_SAVED: indicates that VF is restored.
2x copy/paste typo
> * @XE_GT_SRIOV_STATE_RESUME_WIP: indicates the a VF resume operation is in progress.
> * @XE_GT_SRIOV_STATE_RESUME_SEND_RESUME: indicates that the PF is about to send RESUME command.
> * @XE_GT_SRIOV_STATE_RESUME_FAILED: indicates that a VF resume operation has failed.
> @@ -63,6 +70,16 @@ enum xe_gt_sriov_control_bits {
> XE_GT_SRIOV_STATE_PAUSE_FAILED,
> XE_GT_SRIOV_STATE_PAUSED,
>
> + XE_GT_SRIOV_STATE_MIGRATION_DATA_WIP,
> +
> + XE_GT_SRIOV_STATE_SAVE_WIP,
> + XE_GT_SRIOV_STATE_SAVE_FAILED,
> + XE_GT_SRIOV_STATE_SAVED,
> +
> + XE_GT_SRIOV_STATE_RESTORE_WIP,
> + XE_GT_SRIOV_STATE_RESTORE_FAILED,
> + XE_GT_SRIOV_STATE_RESTORED,
> +
> XE_GT_SRIOV_STATE_RESUME_WIP,
> XE_GT_SRIOV_STATE_RESUME_SEND_RESUME,
> XE_GT_SRIOV_STATE_RESUME_FAILED,
> diff --git a/drivers/gpu/drm/xe/xe_sriov_pf_control.c b/drivers/gpu/drm/xe/xe_sriov_pf_control.c
> index 416d00a03fbb7..e64c7b56172c6 100644
> --- a/drivers/gpu/drm/xe/xe_sriov_pf_control.c
> +++ b/drivers/gpu/drm/xe/xe_sriov_pf_control.c
> @@ -149,3 +149,99 @@ int xe_sriov_pf_control_sync_flr(struct xe_device *xe, unsigned int vfid)
>
> return 0;
> }
> +
> +/**
> + * xe_sriov_pf_control_save_vf - Save VF migration data on all GTs.
> + * @xe: the &xe_device
> + * @vfid: the VF identifier
> + *
> + * This function is for PF only.
> + *
> + * Return: 0 on success or a negative error code on failure.
> + */
> +int xe_sriov_pf_control_save_vf(struct xe_device *xe, unsigned int vfid)
> +{
> + struct xe_gt *gt;
> + unsigned int id;
> + int ret;
> +
> + for_each_gt(gt, xe, id) {
> + ret = xe_gt_sriov_pf_control_save_vf(gt, vfid);
> + if (ret)
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +/**
> + * xe_sriov_pf_control_wait_save_vf - Wait until VF migration data was saved on all GTs
> + * @xe: the &xe_device
> + * @vfid: the VF identifier
> + *
> + * This function is for PF only.
> + *
> + * Return: 0 on success or a negative error code on failure.
> + */
> +int xe_sriov_pf_control_wait_save_vf(struct xe_device *xe, unsigned int vfid)
> +{
> + struct xe_gt *gt;
> + u8 id;
"unsigned int" like above?
> + int ret;
> +
> + for_each_gt(gt, xe, id) {
> + ret = xe_gt_sriov_pf_control_wait_save_done(gt, vfid);
> + if (ret)
> + break;
> + }
> +
> + return ret;
> +}
> +
> +/**
> + * xe_sriov_pf_control_restore_vf - Restore VF migration data on all GTs.
> + * @xe: the &xe_device
> + * @vfid: the VF identifier
> + *
> + * This function is for PF only.
> + *
> + * Return: 0 on success or a negative error code on failure.
> + */
> +int xe_sriov_pf_control_restore_vf(struct xe_device *xe, unsigned int vfid)
> +{
> + struct xe_gt *gt;
> + u8 id;
> + int ret;
> +
> + for_each_gt(gt, xe, id) {
> + ret = xe_gt_sriov_pf_control_restore_vf(gt, vfid);
> + if (ret)
> + return ret;
> + }
> +
> + return ret;
> +}
> +
> +/**
> + * xe_sriov_pf_control_wait_save_vf - Wait until VF migration data was restored on all GTs
> + * @xe: the &xe_device
> + * @vfid: the VF identifier
> + *
> + * This function is for PF only.
> + *
> + * Return: 0 on success or a negative error code on failure.
> + */
> +int xe_sriov_pf_control_wait_restore_vf(struct xe_device *xe, unsigned int vfid)
> +{
> + struct xe_gt *gt;
> + u8 id;
> + int ret;
> +
> + for_each_gt(gt, xe, id) {
> + ret = xe_gt_sriov_pf_control_wait_restore_done(gt, vfid);
> + if (ret)
> + break;
> + }
> +
> + return ret;
> +}
> diff --git a/drivers/gpu/drm/xe/xe_sriov_pf_control.h b/drivers/gpu/drm/xe/xe_sriov_pf_control.h
> index 2d52d0ac1b28f..512fd21d87c1e 100644
> --- a/drivers/gpu/drm/xe/xe_sriov_pf_control.h
> +++ b/drivers/gpu/drm/xe/xe_sriov_pf_control.h
> @@ -13,5 +13,9 @@ int xe_sriov_pf_control_resume_vf(struct xe_device *xe, unsigned int vfid);
> int xe_sriov_pf_control_stop_vf(struct xe_device *xe, unsigned int vfid);
> int xe_sriov_pf_control_reset_vf(struct xe_device *xe, unsigned int vfid);
> int xe_sriov_pf_control_sync_flr(struct xe_device *xe, unsigned int vfid);
> +int xe_sriov_pf_control_save_vf(struct xe_device *xe, unsigned int vfid);
> +int xe_sriov_pf_control_wait_save_vf(struct xe_device *xe, unsigned int vfid);
> +int xe_sriov_pf_control_restore_vf(struct xe_device *xe, unsigned int vfid);
> +int xe_sriov_pf_control_wait_restore_vf(struct xe_device *xe, unsigned int vfid);
>
> #endif
> diff --git a/drivers/gpu/drm/xe/xe_sriov_pf_debugfs.c b/drivers/gpu/drm/xe/xe_sriov_pf_debugfs.c
> index 97636ed86fb8b..74eeabef91c57 100644
> --- a/drivers/gpu/drm/xe/xe_sriov_pf_debugfs.c
> +++ b/drivers/gpu/drm/xe/xe_sriov_pf_debugfs.c
> @@ -75,11 +75,31 @@ static void pf_populate_pf(struct xe_device *xe, struct dentry *pfdent)
> * │ │ ├── reset
> * │ │ ├── resume
> * │ │ ├── stop
> + * │ │ ├── save
> + * │ │ ├── restore
> * │ │ :
> * │ ├── vf2
> * │ │ ├── ...
> */
>
> +static int from_file_read_to_vf_call(struct seq_file *s,
> + int (*call)(struct xe_device *, unsigned int))
> +{
> + struct dentry *dent = file_dentry(s->file)->d_parent;
> + struct xe_device *xe = extract_xe(dent);
> + unsigned int vfid = extract_vfid(dent);
> + int ret;
> +
> + xe_pm_runtime_get(xe);
> + ret = call(xe, vfid);
> + xe_pm_runtime_put(xe);
> +
> + if (ret < 0)
> + return ret;
> +
> + return s->count;
since we don't expect to put anything into "s", maybe we can explicitly return 0 here?
> +}
> +
> static ssize_t from_file_write_to_vf_call(struct file *file, const char __user *userbuf,
> size_t count, loff_t *ppos,
> int (*call)(struct xe_device *, unsigned int))
> @@ -118,10 +138,26 @@ static ssize_t OP##_write(struct file *file, const char __user *userbuf, \
> } \
> DEFINE_SHOW_STORE_ATTRIBUTE(OP)
>
> +#define DEFINE_VF_RW_CONTROL_ATTRIBUTE(OP) \
rename it to have RW as suffix (like other ATTR macros):
DEFINE_VF_CONTROL_ATTRIBUTE_RW
> +static int OP##_show(struct seq_file *s, void *unused) \
> +{ \
> + return from_file_read_to_vf_call(s, \
> + xe_sriov_pf_control_wait_##OP); \
> +} \
> +static ssize_t OP##_write(struct file *file, const char __user *userbuf, \
> + size_t count, loff_t *ppos) \
> +{ \
> + return from_file_write_to_vf_call(file, userbuf, count, ppos, \
> + xe_sriov_pf_control_##OP); \
> +} \
> +DEFINE_SHOW_STORE_ATTRIBUTE(OP)
> +
> DEFINE_VF_CONTROL_ATTRIBUTE(pause_vf);
> DEFINE_VF_CONTROL_ATTRIBUTE(resume_vf);
> DEFINE_VF_CONTROL_ATTRIBUTE(stop_vf);
> DEFINE_VF_CONTROL_ATTRIBUTE(reset_vf);
> +DEFINE_VF_RW_CONTROL_ATTRIBUTE(save_vf);
> +DEFINE_VF_RW_CONTROL_ATTRIBUTE(restore_vf);
>
> static void pf_populate_vf(struct xe_device *xe, struct dentry *vfdent)
> {
> @@ -129,6 +165,8 @@ static void pf_populate_vf(struct xe_device *xe, struct dentry *vfdent)
> debugfs_create_file("resume", 0200, vfdent, xe, &resume_vf_fops);
> debugfs_create_file("stop", 0200, vfdent, xe, &stop_vf_fops);
> debugfs_create_file("reset", 0200, vfdent, xe, &reset_vf_fops);
> + debugfs_create_file("save", 0600, vfdent, xe, &save_vf_fops);
> + debugfs_create_file("restore", 0600, vfdent, xe, &restore_vf_fops);
> }
>
> static void pf_populate_with_tiles(struct xe_device *xe, struct dentry *dent, unsigned int vfid)
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