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Message-ID: <9d7ccca5-f6c8-4a6b-9319-e183fac9a5af@intel.com>
Date: Thu, 23 Oct 2025 01:02:26 +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>, <intel-xe@...ts.freedesktop.org>,
<linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>, Matthew Brost
<matthew.brost@...el.com>
CC: <dri-devel@...ts.freedesktop.org>, 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 v2 08/26] drm/xe/pf: Expose VF migration data size over
debugfs
On 10/22/2025 12:41 AM, Michał Winiarski wrote:
> The size is normally used to make a decision on when to stop the device
> (mainly when it's in a pre_copy state).
>
> Signed-off-by: Michał Winiarski <michal.winiarski@...el.com>
> ---
> drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.c | 19 ++++++++++++
> drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.h | 2 ++
> drivers/gpu/drm/xe/xe_sriov_pf_debugfs.c | 29 ++++++++++++++++++
> drivers/gpu/drm/xe/xe_sriov_pf_migration.c | 30 +++++++++++++++++++
> drivers/gpu/drm/xe/xe_sriov_pf_migration.h | 1 +
> 5 files changed, 81 insertions(+)
>
> 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 8ba72165759b3..4e26feb9c267f 100644
> --- a/drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.c
> +++ b/drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.c
> @@ -395,6 +395,25 @@ ssize_t xe_gt_sriov_pf_migration_write_guc_state(struct xe_gt *gt, unsigned int
> }
> #endif /* CONFIG_DEBUG_FS */
>
> +/**
> + * xe_gt_sriov_pf_migration_size() - Total size of migration data from all components within a GT.
> + * @gt: the &xe_gt
> + * @vfid: the VF identifier
> + *
> + * This function is for PF only.
> + *
> + * Return: total migration data size in bytes or a negative error code on failure.
> + */
> +ssize_t xe_gt_sriov_pf_migration_size(struct xe_gt *gt, unsigned int vfid)
> +{
> + ssize_t total = 0;
> +
> + xe_gt_assert(gt, IS_SRIOV_PF(gt_to_xe(gt)));
> +
> + /* Nothing to query yet - will be updated once per-GT migration data types are added */
> + return total;
> +}
> +
> /**
> * xe_gt_sriov_pf_migration_ring_empty() - Check if a migration ring is empty.
> * @gt: the &xe_gt
> diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.h b/drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.h
> index 1ed2248f0a17e..e2d41750f863c 100644
> --- a/drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.h
> +++ b/drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.h
> @@ -15,6 +15,8 @@ int xe_gt_sriov_pf_migration_init(struct xe_gt *gt);
> int xe_gt_sriov_pf_migration_save_guc_state(struct xe_gt *gt, unsigned int vfid);
> int xe_gt_sriov_pf_migration_restore_guc_state(struct xe_gt *gt, unsigned int vfid);
>
> +ssize_t xe_gt_sriov_pf_migration_size(struct xe_gt *gt, unsigned int vfid);
> +
> bool xe_gt_sriov_pf_migration_ring_empty(struct xe_gt *gt, unsigned int vfid);
> bool xe_gt_sriov_pf_migration_ring_full(struct xe_gt *gt, unsigned int vfid);
> void xe_gt_sriov_pf_migration_ring_free(struct xe_gt *gt, unsigned int vfid);
> diff --git a/drivers/gpu/drm/xe/xe_sriov_pf_debugfs.c b/drivers/gpu/drm/xe/xe_sriov_pf_debugfs.c
> index a9a28aec22421..bc2d0b0342f22 100644
> --- a/drivers/gpu/drm/xe/xe_sriov_pf_debugfs.c
> +++ b/drivers/gpu/drm/xe/xe_sriov_pf_debugfs.c
> @@ -14,6 +14,7 @@
> #include "xe_sriov_pf_control.h"
> #include "xe_sriov_pf_debugfs.h"
> #include "xe_sriov_pf_helpers.h"
> +#include "xe_sriov_pf_migration.h"
> #include "xe_sriov_pf_provision.h"
> #include "xe_sriov_pf_service.h"
> #include "xe_sriov_printk.h"
> @@ -254,6 +255,33 @@ static const struct file_operations data_vf_fops = {
> .llseek = default_llseek,
> };
>
> +static ssize_t size_read(struct file *file, char __user *ubuf, size_t count, loff_t *ppos)
> +{
> + struct dentry *dent = file_dentry(file)->d_parent;
> + struct xe_device *xe = extract_xe(dent);
> + unsigned int vfid = extract_vfid(dent);
> + char buf[21];
> + ssize_t ret;
> + int len;
> +
> + xe_pm_runtime_get(xe);
> + ret = xe_sriov_pf_migration_size(xe, vfid);
> + xe_pm_runtime_put(xe);
IIRC during simple "cat migration_size" we might be called twice
to avoid that we can calc size in .open instead, see config_blob
but not a blocker, so
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@...el.com>
> + if (ret < 0)
> + return ret;
> +
> + len = scnprintf(buf, sizeof(buf), "%zd\n", ret);
> +
> + return simple_read_from_buffer(ubuf, count, ppos, buf, len);
> +}
> +
> +static const struct file_operations size_vf_fops = {
> + .owner = THIS_MODULE,
> + .open = simple_open,
> + .read = size_read,
> + .llseek = default_llseek,
> +};
> +
> static void pf_populate_vf(struct xe_device *xe, struct dentry *vfdent)
> {
> debugfs_create_file("pause", 0200, vfdent, xe, &pause_vf_fops);
> @@ -263,6 +291,7 @@ static void pf_populate_vf(struct xe_device *xe, struct dentry *vfdent)
> debugfs_create_file("save", 0600, vfdent, xe, &save_vf_fops);
> debugfs_create_file("restore", 0600, vfdent, xe, &restore_vf_fops);
> debugfs_create_file("migration_data", 0600, vfdent, xe, &data_vf_fops);
> + debugfs_create_file("migration_size", 0400, vfdent, xe, &size_vf_fops);
> }
>
> static void pf_populate_with_tiles(struct xe_device *xe, struct dentry *dent, unsigned int vfid)
> diff --git a/drivers/gpu/drm/xe/xe_sriov_pf_migration.c b/drivers/gpu/drm/xe/xe_sriov_pf_migration.c
> index 0b4b237780102..88babec9c893e 100644
> --- a/drivers/gpu/drm/xe/xe_sriov_pf_migration.c
> +++ b/drivers/gpu/drm/xe/xe_sriov_pf_migration.c
> @@ -242,3 +242,33 @@ int xe_sriov_pf_migration_restore_produce(struct xe_device *xe, unsigned int vfi
>
> return xe_gt_sriov_pf_migration_restore_produce(gt, vfid, data);
> }
> +
> +/**
> + * xe_sriov_pf_migration_size() - Total size of migration data from all components within a device
> + * @xe: the &xe_device
> + * @vfid: the VF identifier (can't be 0)
> + *
> + * This function is for PF only.
> + *
> + * Return: total migration data size in bytes or a negative error code on failure.
> + */
> +ssize_t xe_sriov_pf_migration_size(struct xe_device *xe, unsigned int vfid)
> +{
> + size_t size = 0;
> + struct xe_gt *gt;
> + ssize_t ret;
> + u8 gt_id;
> +
> + xe_assert(xe, IS_SRIOV_PF(xe));
> + xe_assert(xe, vfid);
> +
> + for_each_gt(gt, xe, gt_id) {
> + ret = xe_gt_sriov_pf_migration_size(gt, vfid);
> + if (ret < 0)
> + return ret;
> +
> + size += ret;
> + }
> +
> + return size;
> +}
> diff --git a/drivers/gpu/drm/xe/xe_sriov_pf_migration.h b/drivers/gpu/drm/xe/xe_sriov_pf_migration.h
> index df81a540c246a..16cb444c36aa6 100644
> --- a/drivers/gpu/drm/xe/xe_sriov_pf_migration.h
> +++ b/drivers/gpu/drm/xe/xe_sriov_pf_migration.h
> @@ -18,6 +18,7 @@ int xe_sriov_pf_migration_restore_produce(struct xe_device *xe, unsigned int vfi
> struct xe_sriov_migration_data *data);
> struct xe_sriov_migration_data *
> xe_sriov_pf_migration_save_consume(struct xe_device *xe, unsigned int vfid);
> +ssize_t xe_sriov_pf_migration_size(struct xe_device *xe, unsigned int vfid);
> wait_queue_head_t *xe_sriov_pf_migration_waitqueue(struct xe_device *xe, unsigned int vfid);
>
> #endif
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