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drm/xe/pf: Export helpers for VFIO

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Device specific VFIO driver variant for Xe will implement VF migration.
Export everything that's needed for migration ops.

Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patch.msgid.link/20251127093934.1462188-4-michal.winiarski@intel.com
Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
(cherry picked from commit 17f22465c5)
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
This commit is contained in:
Michał Winiarski
2025-11-27 10:39:33 +01:00
committed by Thomas Hellström
parent 5be29ebe9f
commit bd45d46ffc
3 changed files with 227 additions and 0 deletions
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143
include/drm/intel/xe_sriov_vfio.h Normal file
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/* SPDX-License-Identifier: MIT */
/*
* Copyright © 2025 Intel Corporation
*/
#ifndef _XE_SRIOV_VFIO_H_
#define _XE_SRIOV_VFIO_H_
#include <linux/types.h>
struct pci_dev;
struct xe_device;
/**
* xe_sriov_vfio_get_pf() - Get PF &xe_device.
* @pdev: the VF &pci_dev device
*
* Return: pointer to PF &xe_device, NULL otherwise.
*/
struct xe_device *xe_sriov_vfio_get_pf(struct pci_dev *pdev);
/**
* xe_sriov_vfio_migration_supported() - Check if migration is supported.
* @xe: the PF &xe_device obtained by calling xe_sriov_vfio_get_pf()
*
* Return: true if migration is supported, false otherwise.
*/
bool xe_sriov_vfio_migration_supported(struct xe_device *xe);
/**
* xe_sriov_vfio_wait_flr_done() - Wait for VF FLR completion.
* @xe: the PF &xe_device obtained by calling xe_sriov_vfio_get_pf()
* @vfid: the VF identifier (can't be 0)
*
* This function will wait until VF FLR is processed by PF on all tiles (or
* until timeout occurs).
*
* Return: 0 on success or a negative error code on failure.
*/
int xe_sriov_vfio_wait_flr_done(struct xe_device *xe, unsigned int vfid);
/**
* xe_sriov_vfio_suspend_device() - Suspend VF.
* @xe: the PF &xe_device obtained by calling xe_sriov_vfio_get_pf()
* @vfid: the VF identifier (can't be 0)
*
* This function will pause VF on all tiles/GTs.
*
* Return: 0 on success or a negative error code on failure.
*/
int xe_sriov_vfio_suspend_device(struct xe_device *xe, unsigned int vfid);
/**
* xe_sriov_vfio_resume_device() - Resume VF.
* @xe: the PF &xe_device obtained by calling xe_sriov_vfio_get_pf()
* @vfid: the VF identifier (can't be 0)
*
* This function will resume VF on all tiles.
*
* Return: 0 on success or a negative error code on failure.
*/
int xe_sriov_vfio_resume_device(struct xe_device *xe, unsigned int vfid);
/**
* xe_sriov_vfio_stop_copy_enter() - Initiate a VF device migration data save.
* @xe: the PF &xe_device obtained by calling xe_sriov_vfio_get_pf()
* @vfid: the VF identifier (can't be 0)
*
* Return: 0 on success or a negative error code on failure.
*/
int xe_sriov_vfio_stop_copy_enter(struct xe_device *xe, unsigned int vfid);
/**
* xe_sriov_vfio_stop_copy_exit() - Finish a VF device migration data save.
* @xe: the PF &xe_device obtained by calling xe_sriov_vfio_get_pf()
* @vfid: the VF identifier (can't be 0)
*
* Return: 0 on success or a negative error code on failure.
*/
int xe_sriov_vfio_stop_copy_exit(struct xe_device *xe, unsigned int vfid);
/**
* xe_sriov_vfio_resume_data_enter() - Initiate a VF device migration data restore.
* @xe: the PF &xe_device obtained by calling xe_sriov_vfio_get_pf()
* @vfid: the VF identifier (can't be 0)
*
* Return: 0 on success or a negative error code on failure.
*/
int xe_sriov_vfio_resume_data_enter(struct xe_device *xe, unsigned int vfid);
/**
* xe_sriov_vfio_resume_data_exit() - Finish a VF device migration data restore.
* @xe: the PF &xe_device obtained by calling xe_sriov_vfio_get_pf()
* @vfid: the VF identifier (can't be 0)
*
* Return: 0 on success or a negative error code on failure.
*/
int xe_sriov_vfio_resume_data_exit(struct xe_device *xe, unsigned int vfid);
/**
* xe_sriov_vfio_error() - Move VF device to error state.
* @xe: the PF &xe_device obtained by calling xe_sriov_vfio_get_pf()
* @vfid: the VF identifier (can't be 0)
*
* Reset is needed to move it out of error state.
*
* Return: 0 on success or a negative error code on failure.
*/
int xe_sriov_vfio_error(struct xe_device *xe, unsigned int vfid);
/**
* xe_sriov_vfio_data_read() - Read migration data from the VF device.
* @xe: the PF &xe_device obtained by calling xe_sriov_vfio_get_pf()
* @vfid: the VF identifier (can't be 0)
* @buf: start address of userspace buffer
* @len: requested read size from userspace
*
* Return: number of bytes that has been successfully read,
* 0 if no more migration data is available, -errno on failure.
*/
ssize_t xe_sriov_vfio_data_read(struct xe_device *xe, unsigned int vfid,
char __user *buf, size_t len);
/**
* xe_sriov_vfio_data_write() - Write migration data to the VF device.
* @xe: the PF &xe_device obtained by calling xe_sriov_vfio_get_pf()
* @vfid: the VF identifier (can't be 0)
* @buf: start address of userspace buffer
* @len: requested write size from userspace
*
* Return: number of bytes that has been successfully written, -errno on failure.
*/
ssize_t xe_sriov_vfio_data_write(struct xe_device *xe, unsigned int vfid,
const char __user *buf, size_t len);
/**
* xe_sriov_vfio_stop_copy_size() - Get a size estimate of VF device migration data.
* @xe: the PF &xe_device obtained by calling xe_sriov_vfio_get_pf()
* @vfid: the VF identifier (can't be 0)
*
* Return: migration data size in bytes or a negative error code on failure.
*/
ssize_t xe_sriov_vfio_stop_copy_size(struct xe_device *xe, unsigned int vfid);
#endif