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Message-ID: <20251105151027.540712-10-michal.winiarski@intel.com>
Date: Wed, 5 Nov 2025 16:10:07 +0100
From: Michał Winiarski <michal.winiarski@...el.com>
To: Alex Williamson <alex@...zbot.org>, 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 <skolothumtho@...dia.com>,
<intel-xe@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
<kvm@...r.kernel.org>, Matthew Brost <matthew.brost@...el.com>, "Michal
Wajdeczko" <michal.wajdeczko@...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>, Christoph Hellwig <hch@...radead.org>,
Michał Winiarski <michal.winiarski@...el.com>
Subject: [PATCH v4 09/28] drm/xe/pf: Expose VF migration data size over debugfs
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>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@...el.com>
---
drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.c | 21 +++++++++++++
drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.h | 2 ++
drivers/gpu/drm/xe/xe_sriov_pf_debugfs.c | 28 +++++++++++++++++
drivers/gpu/drm/xe/xe_sriov_pf_migration.c | 30 +++++++++++++++++++
drivers/gpu/drm/xe/xe_sriov_pf_migration.h | 1 +
5 files changed, 82 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 c492677db28d9..0f56dbc04865d 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 +395,27 @@ 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 (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_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)));
+ xe_gt_assert(gt, vfid != PFID);
+ xe_gt_assert(gt, vfid <= xe_sriov_pf_get_totalvfs(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 b4c7b5dc9e914..3ad3c3609b415 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 4ca86ff4b7dae..00fe73bd86dfe 100644
--- a/drivers/gpu/drm/xe/xe_sriov_pf_debugfs.c
+++ b/drivers/gpu/drm/xe/xe_sriov_pf_debugfs.c
@@ -254,6 +254,33 @@ 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);
+ 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 +290,7 @@ 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 54a2c0f9d5933..30bda27b0b2ab 100644
--- a/drivers/gpu/drm/xe/xe_sriov_pf_migration.c
+++ b/drivers/gpu/drm/xe/xe_sriov_pf_migration.c
@@ -309,3 +309,33 @@ ssize_t xe_sriov_pf_migration_write(struct xe_device *xe, unsigned int vfid,
return produced;
}
+
+/**
+ * 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 dbf8094900df8..b806298a0bb62 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_packet *data);
struct xe_sriov_packet *
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);
ssize_t xe_sriov_pf_migration_read(struct xe_device *xe, unsigned int vfid,
--
2.51.2
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