Commit 20cfef3a authored by Michał Winiarski's avatar Michał Winiarski
Browse files

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).

Reviewed-by: default avatarMichal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patch.msgid.link/20251112132220.516975-10-michal.winiarski@intel.com


Signed-off-by: default avatarMichał Winiarski <michal.winiarski@intel.com>
parent 70e2fa91

drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.c

+21 −0
Original line number Diff line number Diff line
@@ -396,6 +396,27 @@ 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

drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.h

+2 −0
Original line number Diff line number Diff line
@@ -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);

drivers/gpu/drm/xe/xe_sriov_pf_debugfs.c

+28 −0
Original line number Diff line number Diff line
@@ -284,6 +284,33 @@ 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);
@@ -293,6 +320,7 @@ 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)

drivers/gpu/drm/xe/xe_sriov_pf_migration.c

+30 −0
Original line number Diff line number Diff line
@@ -310,3 +310,33 @@ 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;

}

drivers/gpu/drm/xe/xe_sriov_pf_migration.h

+1 −0
Original line number Diff line number Diff line
@@ -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,