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2.1.29 Precedence: list List-Id: Intel Xe graphics driver List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-xe-bounces@lists.freedesktop.org Sender: "Intel-xe" On 10/11/2025 9:38 PM, 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 > --- > drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.c | 18 ++++++++++ > drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.h | 2 ++ > drivers/gpu/drm/xe/xe_sriov_pf_debugfs.c | 34 +++++++++++++++++++ > drivers/gpu/drm/xe/xe_sriov_pf_migration.c | 30 ++++++++++++++++ > drivers/gpu/drm/xe/xe_sriov_pf_migration.h | 1 + > 5 files changed, 85 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 582aaf062cbd4..50f09994e2854 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 +395,24 @@ 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 &struct 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))); > + as this is so trivial now, maybe add some note why it is like that for now > + return total; > +} > + > /** > * xe_gt_sriov_pf_migration_ring_empty() - Check if a migration ring is empty > * @gt: the &struct 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 1e4dc46413823..e5298d35d7d7e 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); > int xe_gt_sriov_pf_migration_ring_produce(struct xe_gt *gt, unsigned int vfid, > struct xe_sriov_pf_migration_data *data); > diff --git a/drivers/gpu/drm/xe/xe_sriov_pf_debugfs.c b/drivers/gpu/drm/xe/xe_sriov_pf_debugfs.c > index ce780719760a6..b06e893fe54cf 100644 > --- a/drivers/gpu/drm/xe/xe_sriov_pf_debugfs.c > +++ b/drivers/gpu/drm/xe/xe_sriov_pf_debugfs.c > @@ -13,6 +13,7 @@ > #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_migration_data.h" > #include "xe_sriov_pf_service.h" > #include "xe_sriov_printk.h" > @@ -203,6 +204,38 @@ 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); > + struct dentry *vfdentry = dent->d_parent; > + struct dentry *migration_dentry = vfdentry->d_parent; > + unsigned int vfid = (uintptr_t)vfdentry->d_inode->i_private; > + struct xe_device *xe = migration_dentry->d_inode->i_private; use helpers > + char buf[21]; > + ssize_t ret; > + int len; > + > + xe_assert(xe, vfid); > + xe_sriov_pf_assert_vfid(xe, vfid); it doesn't matter for this function, so why assert here? > + > + 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); > @@ -212,6 +245,7 @@ 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 a0cfac456ba0b..6b247581dec65 100644 > --- a/drivers/gpu/drm/xe/xe_sriov_pf_migration.c > +++ b/drivers/gpu/drm/xe/xe_sriov_pf_migration.c > @@ -249,3 +249,33 @@ int xe_sriov_pf_migration_produce(struct xe_device *xe, unsigned int vfid, > > return xe_gt_sriov_pf_migration_ring_produce(gt, vfid, data); > } > + > +/** > + * xe_sriov_pf_migration_size() - Total size of migration data from all components within a device > + * @xe: the &struct xe_device > + * @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_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)); > + > + for_each_gt(gt, xe, gt_id) { > + ret = xe_gt_sriov_pf_migration_size(gt, vfid); > + if (ret < 0) { > + size = ret; > + break; just: 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 f2020ba19c2da..887ea3e9632bd 100644 > --- a/drivers/gpu/drm/xe/xe_sriov_pf_migration.h > +++ b/drivers/gpu/drm/xe/xe_sriov_pf_migration.h > @@ -14,6 +14,7 @@ struct xe_device; > #ifdef CONFIG_PCI_IOV > int xe_sriov_pf_migration_init(struct xe_device *xe); > bool xe_sriov_pf_migration_supported(struct xe_device *xe); > +ssize_t xe_sriov_pf_migration_size(struct xe_device *xe, unsigned int vfid); > struct xe_sriov_pf_migration_data * > xe_sriov_pf_migration_consume(struct xe_device *xe, unsigned int vfid); > int xe_sriov_pf_migration_produce(struct xe_device *xe, unsigned int vfid,