mirror of https://github.com/torvalds/linux.git
Cross-subsystem Changes:
- Add device specific vfio_pci driver variant for intel graphics (Michal Winiarski) Driver Changes: - Add scope-based cleanup helper for runtime PM (Matt Roper) - Additional xe driver prerequisites and exports (Michal Winiarski) -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQRskUM7w1oG5rx2IZO4FpNVCsYGvwUCaS1ZrwAKCRC4FpNVCsYG v9iHAQCPfipm3pC3SykJCKe0Ve+gWfglHg4uuwaRLcvlO+fZsQD/T/enYeR+6omX S+owV2xgoVY0cEqYqPsEeOwp4Nj7BQs= =0Ouw -----END PGP SIGNATURE----- Merge tag 'topic/xe-vfio-2025-12-01' of https://gitlab.freedesktop.org/drm/xe/kernel into drm-next Cross-subsystem Changes: - Add device specific vfio_pci driver variant for intel graphics (Michal Winiarski) Driver Changes: - Add scope-based cleanup helper for runtime PM (Matt Roper) - Additional xe driver prerequisites and exports (Michal Winiarski) Signed-off-by: Dave Airlie <airlied@redhat.com> From: Thomas Hellstrom <thomas.hellstrom@linux.intel.com> Link: https://patch.msgid.link/aS1bNpqeem6PIHrA@fedora
This commit is contained in:
Dave Airlie
commit
55a271a0f7
|
|
@ -27022,6 +27022,13 @@ L: virtualization@lists.linux.dev
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|||
S: Maintained
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F: drivers/vfio/pci/virtio
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VFIO XE PCI DRIVER
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M: Michał Winiarski <michal.winiarski@intel.com>
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L: kvm@vger.kernel.org
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L: intel-xe@lists.freedesktop.org
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S: Supported
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F: drivers/vfio/pci/xe
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VGA_SWITCHEROO
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R: Lukas Wunner <lukas@wunner.de>
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S: Maintained
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|
|
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@ -184,6 +184,10 @@ xe-$(CONFIG_PCI_IOV) += \
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xe_sriov_pf_sysfs.o \
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xe_tile_sriov_pf_debugfs.o
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ifeq ($(CONFIG_PCI_IOV),y)
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xe-$(CONFIG_XE_VFIO_PCI) += xe_sriov_vfio.o
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endif
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# include helpers for tests even when XE is built-in
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ifdef CONFIG_DRM_XE_KUNIT_TEST
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xe-y += tests/xe_kunit_helpers.o
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@ -17,6 +17,7 @@
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#include "xe_gt_sriov_pf_helpers.h"
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#include "xe_gt_sriov_pf_migration.h"
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#include "xe_gt_sriov_printk.h"
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#include "xe_guc.h"
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#include "xe_guc_buf.h"
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#include "xe_guc_ct.h"
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#include "xe_migrate.h"
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@ -1023,6 +1024,12 @@ static void action_ring_cleanup(void *arg)
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ptr_ring_cleanup(r, destroy_pf_packet);
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}
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static void pf_gt_migration_check_support(struct xe_gt *gt)
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{
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if (GUC_FIRMWARE_VER(>->uc.guc) < MAKE_GUC_VER(70, 54, 0))
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xe_sriov_pf_migration_disable(gt_to_xe(gt), "requires GuC version >= 70.54.0");
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}
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/**
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* xe_gt_sriov_pf_migration_init() - Initialize support for VF migration.
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* @gt: the &xe_gt
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@ -1039,6 +1046,8 @@ int xe_gt_sriov_pf_migration_init(struct xe_gt *gt)
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xe_gt_assert(gt, IS_SRIOV_PF(xe));
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pf_gt_migration_check_support(gt);
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if (!pf_migration_supported(gt))
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return 0;
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@ -1223,6 +1223,23 @@ static struct pci_driver xe_pci_driver = {
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#endif
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};
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/**
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* xe_pci_to_pf_device() - Get PF &xe_device.
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* @pdev: the VF &pci_dev device
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*
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* Return: pointer to PF &xe_device, NULL otherwise.
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*/
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struct xe_device *xe_pci_to_pf_device(struct pci_dev *pdev)
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{
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struct drm_device *drm;
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drm = pci_iov_get_pf_drvdata(pdev, &xe_pci_driver);
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if (IS_ERR(drm))
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return NULL;
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return to_xe_device(drm);
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}
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int xe_register_pci_driver(void)
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{
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return pci_register_driver(&xe_pci_driver);
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@ -6,7 +6,10 @@
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#ifndef _XE_PCI_H_
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#define _XE_PCI_H_
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struct pci_dev;
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int xe_register_pci_driver(void);
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void xe_unregister_pci_driver(void);
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struct xe_device *xe_pci_to_pf_device(struct pci_dev *pdev);
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#endif
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@ -726,6 +726,13 @@ static void xe_pm_runtime_lockdep_prime(void)
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/**
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* xe_pm_runtime_get - Get a runtime_pm reference and resume synchronously
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* @xe: xe device instance
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*
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* When possible, scope-based runtime PM (through guard(xe_pm_runtime)) is
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* be preferred over direct usage of this function. Manual get/put handling
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* should only be used when the function contains goto-based logic which
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* can break scope-based handling, or when the lifetime of the runtime PM
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* reference does not match a specific scope (e.g., runtime PM obtained in one
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* function and released in a different one).
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*/
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void xe_pm_runtime_get(struct xe_device *xe)
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{
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@ -758,6 +765,13 @@ void xe_pm_runtime_put(struct xe_device *xe)
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* xe_pm_runtime_get_ioctl - Get a runtime_pm reference before ioctl
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* @xe: xe device instance
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*
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* When possible, scope-based runtime PM (through
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* ACQUIRE(xe_pm_runtime_ioctl, ...)) is be preferred over direct usage of this
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* function. Manual get/put handling should only be used when the function
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* contains goto-based logic which can break scope-based handling, or when the
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* lifetime of the runtime PM reference does not match a specific scope (e.g.,
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* runtime PM obtained in one function and released in a different one).
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*
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* Returns: Any number greater than or equal to 0 for success, negative error
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* code otherwise.
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*/
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@ -827,6 +841,13 @@ static bool xe_pm_suspending_or_resuming(struct xe_device *xe)
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* It will warn if not protected.
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* The reference should be put back after this function regardless, since it
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* will always bump the usage counter, regardless.
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*
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* When possible, scope-based runtime PM (through guard(xe_pm_runtime_noresume))
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* is be preferred over direct usage of this function. Manual get/put handling
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* should only be used when the function contains goto-based logic which can
|
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* break scope-based handling, or when the lifetime of the runtime PM reference
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* does not match a specific scope (e.g., runtime PM obtained in one function
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* and released in a different one).
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*/
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void xe_pm_runtime_get_noresume(struct xe_device *xe)
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{
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|
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@ -6,6 +6,7 @@
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#ifndef _XE_PM_H_
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#define _XE_PM_H_
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#include <linux/cleanup.h>
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#include <linux/pm_runtime.h>
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#define DEFAULT_VRAM_THRESHOLD 300 /* in MB */
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@ -37,4 +38,20 @@ int xe_pm_block_on_suspend(struct xe_device *xe);
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void xe_pm_might_block_on_suspend(void);
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int xe_pm_module_init(void);
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static inline void __xe_pm_runtime_noop(struct xe_device *xe) {}
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DEFINE_GUARD(xe_pm_runtime, struct xe_device *,
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xe_pm_runtime_get(_T), xe_pm_runtime_put(_T))
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DEFINE_GUARD(xe_pm_runtime_noresume, struct xe_device *,
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xe_pm_runtime_get_noresume(_T), xe_pm_runtime_put(_T))
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DEFINE_GUARD_COND(xe_pm_runtime, _ioctl, xe_pm_runtime_get_ioctl(_T), _RET >= 0)
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/*
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* Used when a function needs to release runtime PM in all possible cases
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* and error paths, but the wakeref was already acquired by a different
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* function (i.e., get() has already happened so only a put() is needed).
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*/
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DEFINE_GUARD(xe_pm_runtime_release_only, struct xe_device *,
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__xe_pm_runtime_noop(_T), xe_pm_runtime_put(_T));
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#endif
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@ -46,13 +46,37 @@ bool xe_sriov_pf_migration_supported(struct xe_device *xe)
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{
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xe_assert(xe, IS_SRIOV_PF(xe));
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return xe->sriov.pf.migration.supported;
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return IS_ENABLED(CONFIG_DRM_XE_DEBUG) || !xe->sriov.pf.migration.disabled;
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}
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static bool pf_check_migration_support(struct xe_device *xe)
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/**
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* xe_sriov_pf_migration_disable() - Turn off SR-IOV VF migration support on PF.
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* @xe: the &xe_device instance.
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* @fmt: format string for the log message, to be combined with following VAs.
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*/
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void xe_sriov_pf_migration_disable(struct xe_device *xe, const char *fmt, ...)
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{
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/* XXX: for now this is for feature enabling only */
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return IS_ENABLED(CONFIG_DRM_XE_DEBUG);
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struct va_format vaf;
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va_list va_args;
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xe_assert(xe, IS_SRIOV_PF(xe));
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va_start(va_args, fmt);
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vaf.fmt = fmt;
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vaf.va = &va_args;
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xe_sriov_notice(xe, "migration %s: %pV\n",
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IS_ENABLED(CONFIG_DRM_XE_DEBUG) ?
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"missing prerequisite" : "disabled",
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&vaf);
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va_end(va_args);
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xe->sriov.pf.migration.disabled = true;
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}
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static void pf_migration_check_support(struct xe_device *xe)
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{
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if (!xe_device_has_memirq(xe))
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xe_sriov_pf_migration_disable(xe, "requires memory-based IRQ support");
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}
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static void pf_migration_cleanup(void *arg)
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@ -77,7 +101,8 @@ int xe_sriov_pf_migration_init(struct xe_device *xe)
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xe_assert(xe, IS_SRIOV_PF(xe));
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xe->sriov.pf.migration.supported = pf_check_migration_support(xe);
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pf_migration_check_support(xe);
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if (!xe_sriov_pf_migration_supported(xe))
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return 0;
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|
|
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@ -14,6 +14,7 @@ struct xe_sriov_packet;
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|
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int xe_sriov_pf_migration_init(struct xe_device *xe);
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bool xe_sriov_pf_migration_supported(struct xe_device *xe);
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void xe_sriov_pf_migration_disable(struct xe_device *xe, const char *fmt, ...);
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int xe_sriov_pf_migration_restore_produce(struct xe_device *xe, unsigned int vfid,
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struct xe_sriov_packet *data);
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struct xe_sriov_packet *
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|
|
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|
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@ -14,8 +14,8 @@
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* struct xe_sriov_pf_migration - Xe device level VF migration data
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*/
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struct xe_sriov_pf_migration {
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/** @supported: indicates whether VF migration feature is supported */
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bool supported;
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/** @disabled: indicates whether VF migration feature is disabled */
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bool disabled;
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};
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|
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/**
|
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|
|
|
|||
|
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@ -0,0 +1,80 @@
|
|||
// SPDX-License-Identifier: MIT
|
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/*
|
||||
* Copyright © 2025 Intel Corporation
|
||||
*/
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||||
|
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#include <drm/intel/xe_sriov_vfio.h>
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#include <linux/cleanup.h>
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|
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#include "xe_pci.h"
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#include "xe_pm.h"
|
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#include "xe_sriov_pf_control.h"
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#include "xe_sriov_pf_helpers.h"
|
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#include "xe_sriov_pf_migration.h"
|
||||
|
||||
struct xe_device *xe_sriov_vfio_get_pf(struct pci_dev *pdev)
|
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{
|
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return xe_pci_to_pf_device(pdev);
|
||||
}
|
||||
EXPORT_SYMBOL_FOR_MODULES(xe_sriov_vfio_get_pf, "xe-vfio-pci");
|
||||
|
||||
bool xe_sriov_vfio_migration_supported(struct xe_device *xe)
|
||||
{
|
||||
if (!IS_SRIOV_PF(xe))
|
||||
return -EPERM;
|
||||
|
||||
return xe_sriov_pf_migration_supported(xe);
|
||||
}
|
||||
EXPORT_SYMBOL_FOR_MODULES(xe_sriov_vfio_migration_supported, "xe-vfio-pci");
|
||||
|
||||
#define DEFINE_XE_SRIOV_VFIO_FUNCTION(_type, _func, _impl) \
|
||||
_type xe_sriov_vfio_##_func(struct xe_device *xe, unsigned int vfid) \
|
||||
{ \
|
||||
if (!IS_SRIOV_PF(xe)) \
|
||||
return -EPERM; \
|
||||
if (vfid == PFID || vfid > xe_sriov_pf_num_vfs(xe)) \
|
||||
return -EINVAL; \
|
||||
\
|
||||
guard(xe_pm_runtime_noresume)(xe); \
|
||||
\
|
||||
return xe_sriov_pf_##_impl(xe, vfid); \
|
||||
} \
|
||||
EXPORT_SYMBOL_FOR_MODULES(xe_sriov_vfio_##_func, "xe-vfio-pci")
|
||||
|
||||
DEFINE_XE_SRIOV_VFIO_FUNCTION(int, wait_flr_done, control_wait_flr);
|
||||
DEFINE_XE_SRIOV_VFIO_FUNCTION(int, suspend_device, control_pause_vf);
|
||||
DEFINE_XE_SRIOV_VFIO_FUNCTION(int, resume_device, control_resume_vf);
|
||||
DEFINE_XE_SRIOV_VFIO_FUNCTION(int, stop_copy_enter, control_trigger_save_vf);
|
||||
DEFINE_XE_SRIOV_VFIO_FUNCTION(int, stop_copy_exit, control_finish_save_vf);
|
||||
DEFINE_XE_SRIOV_VFIO_FUNCTION(int, resume_data_enter, control_trigger_restore_vf);
|
||||
DEFINE_XE_SRIOV_VFIO_FUNCTION(int, resume_data_exit, control_finish_restore_vf);
|
||||
DEFINE_XE_SRIOV_VFIO_FUNCTION(int, error, control_stop_vf);
|
||||
DEFINE_XE_SRIOV_VFIO_FUNCTION(ssize_t, stop_copy_size, migration_size);
|
||||
|
||||
ssize_t xe_sriov_vfio_data_read(struct xe_device *xe, unsigned int vfid,
|
||||
char __user *buf, size_t len)
|
||||
{
|
||||
if (!IS_SRIOV_PF(xe))
|
||||
return -EPERM;
|
||||
if (vfid == PFID || vfid > xe_sriov_pf_num_vfs(xe))
|
||||
return -EINVAL;
|
||||
|
||||
guard(xe_pm_runtime_noresume)(xe);
|
||||
|
||||
return xe_sriov_pf_migration_read(xe, vfid, buf, len);
|
||||
}
|
||||
EXPORT_SYMBOL_FOR_MODULES(xe_sriov_vfio_data_read, "xe-vfio-pci");
|
||||
|
||||
ssize_t xe_sriov_vfio_data_write(struct xe_device *xe, unsigned int vfid,
|
||||
const char __user *buf, size_t len)
|
||||
{
|
||||
if (!IS_SRIOV_PF(xe))
|
||||
return -EPERM;
|
||||
if (vfid == PFID || vfid > xe_sriov_pf_num_vfs(xe))
|
||||
return -EINVAL;
|
||||
|
||||
guard(xe_pm_runtime_noresume)(xe);
|
||||
|
||||
return xe_sriov_pf_migration_write(xe, vfid, buf, len);
|
||||
}
|
||||
EXPORT_SYMBOL_FOR_MODULES(xe_sriov_vfio_data_write, "xe-vfio-pci");
|
||||
|
|
@ -67,4 +67,6 @@ source "drivers/vfio/pci/nvgrace-gpu/Kconfig"
|
|||
|
||||
source "drivers/vfio/pci/qat/Kconfig"
|
||||
|
||||
source "drivers/vfio/pci/xe/Kconfig"
|
||||
|
||||
endmenu
|
||||
|
|
|
|||
|
|
@ -19,3 +19,5 @@ obj-$(CONFIG_VIRTIO_VFIO_PCI) += virtio/
|
|||
obj-$(CONFIG_NVGRACE_GPU_VFIO_PCI) += nvgrace-gpu/
|
||||
|
||||
obj-$(CONFIG_QAT_VFIO_PCI) += qat/
|
||||
|
||||
obj-$(CONFIG_XE_VFIO_PCI) += xe/
|
||||
|
|
|
|||
|
|
@ -0,0 +1,12 @@
|
|||
# SPDX-License-Identifier: GPL-2.0-only
|
||||
config XE_VFIO_PCI
|
||||
tristate "VFIO support for Intel Graphics"
|
||||
depends on DRM_XE && PCI_IOV
|
||||
select VFIO_PCI_CORE
|
||||
help
|
||||
This option enables device specific VFIO driver variant for Intel Graphics.
|
||||
In addition to generic VFIO PCI functionality, it implements VFIO
|
||||
migration uAPI allowing userspace to enable migration for
|
||||
Intel Graphics SR-IOV Virtual Functions supported by the Xe driver.
|
||||
|
||||
If you don't know what to do here, say N.
|
||||
|
|
@ -0,0 +1,3 @@
|
|||
# SPDX-License-Identifier: GPL-2.0-only
|
||||
obj-$(CONFIG_XE_VFIO_PCI) += xe-vfio-pci.o
|
||||
xe-vfio-pci-y := main.o
|
||||
|
|
@ -0,0 +1,573 @@
|
|||
// SPDX-License-Identifier: GPL-2.0-only
|
||||
/*
|
||||
* Copyright © 2025 Intel Corporation
|
||||
*/
|
||||
|
||||
#include <linux/anon_inodes.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/file.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/pci.h>
|
||||
#include <linux/sizes.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/vfio.h>
|
||||
#include <linux/vfio_pci_core.h>
|
||||
|
||||
#include <drm/intel/xe_sriov_vfio.h>
|
||||
#include <drm/intel/pciids.h>
|
||||
|
||||
struct xe_vfio_pci_migration_file {
|
||||
struct file *filp;
|
||||
/* serializes accesses to migration data */
|
||||
struct mutex lock;
|
||||
struct xe_vfio_pci_core_device *xe_vdev;
|
||||
u8 disabled:1;
|
||||
};
|
||||
|
||||
struct xe_vfio_pci_core_device {
|
||||
struct vfio_pci_core_device core_device;
|
||||
struct xe_device *xe;
|
||||
/* PF internal control uses vfid index starting from 1 */
|
||||
unsigned int vfid;
|
||||
u8 deferred_reset:1;
|
||||
/* protects migration state */
|
||||
struct mutex state_mutex;
|
||||
enum vfio_device_mig_state mig_state;
|
||||
/* protects the reset_done flow */
|
||||
spinlock_t reset_lock;
|
||||
struct xe_vfio_pci_migration_file *migf;
|
||||
};
|
||||
|
||||
#define xe_vdev_to_dev(xe_vdev) (&(xe_vdev)->core_device.pdev->dev)
|
||||
|
||||
static void xe_vfio_pci_disable_file(struct xe_vfio_pci_migration_file *migf)
|
||||
{
|
||||
mutex_lock(&migf->lock);
|
||||
migf->disabled = true;
|
||||
mutex_unlock(&migf->lock);
|
||||
}
|
||||
|
||||
static void xe_vfio_pci_put_file(struct xe_vfio_pci_core_device *xe_vdev)
|
||||
{
|
||||
xe_vfio_pci_disable_file(xe_vdev->migf);
|
||||
fput(xe_vdev->migf->filp);
|
||||
xe_vdev->migf = NULL;
|
||||
}
|
||||
|
||||
static void xe_vfio_pci_reset(struct xe_vfio_pci_core_device *xe_vdev)
|
||||
{
|
||||
if (xe_vdev->migf)
|
||||
xe_vfio_pci_put_file(xe_vdev);
|
||||
|
||||
xe_vdev->mig_state = VFIO_DEVICE_STATE_RUNNING;
|
||||
}
|
||||
|
||||
static void xe_vfio_pci_state_mutex_lock(struct xe_vfio_pci_core_device *xe_vdev)
|
||||
{
|
||||
mutex_lock(&xe_vdev->state_mutex);
|
||||
}
|
||||
|
||||
/*
|
||||
* This function is called in all state_mutex unlock cases to
|
||||
* handle a 'deferred_reset' if exists.
|
||||
*/
|
||||
static void xe_vfio_pci_state_mutex_unlock(struct xe_vfio_pci_core_device *xe_vdev)
|
||||
{
|
||||
again:
|
||||
spin_lock(&xe_vdev->reset_lock);
|
||||
if (xe_vdev->deferred_reset) {
|
||||
xe_vdev->deferred_reset = false;
|
||||
spin_unlock(&xe_vdev->reset_lock);
|
||||
xe_vfio_pci_reset(xe_vdev);
|
||||
goto again;
|
||||
}
|
||||
mutex_unlock(&xe_vdev->state_mutex);
|
||||
spin_unlock(&xe_vdev->reset_lock);
|
||||
}
|
||||
|
||||
static void xe_vfio_pci_reset_done(struct pci_dev *pdev)
|
||||
{
|
||||
struct xe_vfio_pci_core_device *xe_vdev = pci_get_drvdata(pdev);
|
||||
int ret;
|
||||
|
||||
if (!pdev->is_virtfn)
|
||||
return;
|
||||
|
||||
/*
|
||||
* VF FLR requires additional processing done by PF driver.
|
||||
* The processing is done after FLR is already finished from PCIe
|
||||
* perspective.
|
||||
* In order to avoid a scenario where VF is used while PF processing
|
||||
* is still in progress, additional synchronization point is needed.
|
||||
*/
|
||||
ret = xe_sriov_vfio_wait_flr_done(xe_vdev->xe, xe_vdev->vfid);
|
||||
if (ret)
|
||||
dev_err(&pdev->dev, "Failed to wait for FLR: %d\n", ret);
|
||||
|
||||
if (!xe_vdev->vfid)
|
||||
return;
|
||||
|
||||
/*
|
||||
* As the higher VFIO layers are holding locks across reset and using
|
||||
* those same locks with the mm_lock we need to prevent ABBA deadlock
|
||||
* with the state_mutex and mm_lock.
|
||||
* In case the state_mutex was taken already we defer the cleanup work
|
||||
* to the unlock flow of the other running context.
|
||||
*/
|
||||
spin_lock(&xe_vdev->reset_lock);
|
||||
xe_vdev->deferred_reset = true;
|
||||
if (!mutex_trylock(&xe_vdev->state_mutex)) {
|
||||
spin_unlock(&xe_vdev->reset_lock);
|
||||
return;
|
||||
}
|
||||
spin_unlock(&xe_vdev->reset_lock);
|
||||
xe_vfio_pci_state_mutex_unlock(xe_vdev);
|
||||
|
||||
xe_vfio_pci_reset(xe_vdev);
|
||||
}
|
||||
|
||||
static const struct pci_error_handlers xe_vfio_pci_err_handlers = {
|
||||
.reset_done = xe_vfio_pci_reset_done,
|
||||
.error_detected = vfio_pci_core_aer_err_detected,
|
||||
};
|
||||
|
||||
static int xe_vfio_pci_open_device(struct vfio_device *core_vdev)
|
||||
{
|
||||
struct xe_vfio_pci_core_device *xe_vdev =
|
||||
container_of(core_vdev, struct xe_vfio_pci_core_device, core_device.vdev);
|
||||
struct vfio_pci_core_device *vdev = &xe_vdev->core_device;
|
||||
int ret;
|
||||
|
||||
ret = vfio_pci_core_enable(vdev);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
xe_vdev->mig_state = VFIO_DEVICE_STATE_RUNNING;
|
||||
|
||||
vfio_pci_core_finish_enable(vdev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void xe_vfio_pci_close_device(struct vfio_device *core_vdev)
|
||||
{
|
||||
struct xe_vfio_pci_core_device *xe_vdev =
|
||||
container_of(core_vdev, struct xe_vfio_pci_core_device, core_device.vdev);
|
||||
|
||||
xe_vfio_pci_state_mutex_lock(xe_vdev);
|
||||
xe_vfio_pci_reset(xe_vdev);
|
||||
xe_vfio_pci_state_mutex_unlock(xe_vdev);
|
||||
vfio_pci_core_close_device(core_vdev);
|
||||
}
|
||||
|
||||
static int xe_vfio_pci_release_file(struct inode *inode, struct file *filp)
|
||||
{
|
||||
struct xe_vfio_pci_migration_file *migf = filp->private_data;
|
||||
|
||||
mutex_destroy(&migf->lock);
|
||||
kfree(migf);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static ssize_t xe_vfio_pci_save_read(struct file *filp, char __user *buf, size_t len, loff_t *pos)
|
||||
{
|
||||
struct xe_vfio_pci_migration_file *migf = filp->private_data;
|
||||
ssize_t ret;
|
||||
|
||||
if (pos)
|
||||
return -ESPIPE;
|
||||
|
||||
mutex_lock(&migf->lock);
|
||||
if (migf->disabled) {
|
||||
mutex_unlock(&migf->lock);
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
ret = xe_sriov_vfio_data_read(migf->xe_vdev->xe, migf->xe_vdev->vfid, buf, len);
|
||||
mutex_unlock(&migf->lock);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static const struct file_operations xe_vfio_pci_save_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.read = xe_vfio_pci_save_read,
|
||||
.release = xe_vfio_pci_release_file,
|
||||
.llseek = noop_llseek,
|
||||
};
|
||||
|
||||
static ssize_t xe_vfio_pci_resume_write(struct file *filp, const char __user *buf,
|
||||
size_t len, loff_t *pos)
|
||||
{
|
||||
struct xe_vfio_pci_migration_file *migf = filp->private_data;
|
||||
ssize_t ret;
|
||||
|
||||
if (pos)
|
||||
return -ESPIPE;
|
||||
|
||||
mutex_lock(&migf->lock);
|
||||
if (migf->disabled) {
|
||||
mutex_unlock(&migf->lock);
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
ret = xe_sriov_vfio_data_write(migf->xe_vdev->xe, migf->xe_vdev->vfid, buf, len);
|
||||
mutex_unlock(&migf->lock);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static const struct file_operations xe_vfio_pci_resume_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.write = xe_vfio_pci_resume_write,
|
||||
.release = xe_vfio_pci_release_file,
|
||||
.llseek = noop_llseek,
|
||||
};
|
||||
|
||||
static const char *vfio_dev_state_str(u32 state)
|
||||
{
|
||||
switch (state) {
|
||||
case VFIO_DEVICE_STATE_RUNNING: return "running";
|
||||
case VFIO_DEVICE_STATE_RUNNING_P2P: return "running_p2p";
|
||||
case VFIO_DEVICE_STATE_STOP_COPY: return "stopcopy";
|
||||
case VFIO_DEVICE_STATE_STOP: return "stop";
|
||||
case VFIO_DEVICE_STATE_RESUMING: return "resuming";
|
||||
case VFIO_DEVICE_STATE_ERROR: return "error";
|
||||
default: return "";
|
||||
}
|
||||
}
|
||||
|
||||
enum xe_vfio_pci_file_type {
|
||||
XE_VFIO_FILE_SAVE = 0,
|
||||
XE_VFIO_FILE_RESUME,
|
||||
};
|
||||
|
||||
static struct xe_vfio_pci_migration_file *
|
||||
xe_vfio_pci_alloc_file(struct xe_vfio_pci_core_device *xe_vdev,
|
||||
enum xe_vfio_pci_file_type type)
|
||||
{
|
||||
struct xe_vfio_pci_migration_file *migf;
|
||||
const struct file_operations *fops;
|
||||
int flags;
|
||||
|
||||
migf = kzalloc(sizeof(*migf), GFP_KERNEL_ACCOUNT);
|
||||
if (!migf)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
fops = type == XE_VFIO_FILE_SAVE ? &xe_vfio_pci_save_fops : &xe_vfio_pci_resume_fops;
|
||||
flags = type == XE_VFIO_FILE_SAVE ? O_RDONLY : O_WRONLY;
|
||||
migf->filp = anon_inode_getfile("xe_vfio_mig", fops, migf, flags);
|
||||
if (IS_ERR(migf->filp)) {
|
||||
kfree(migf);
|
||||
return ERR_CAST(migf->filp);
|
||||
}
|
||||
|
||||
mutex_init(&migf->lock);
|
||||
migf->xe_vdev = xe_vdev;
|
||||
xe_vdev->migf = migf;
|
||||
|
||||
stream_open(migf->filp->f_inode, migf->filp);
|
||||
|
||||
return migf;
|
||||
}
|
||||
|
||||
static struct file *
|
||||
xe_vfio_set_state(struct xe_vfio_pci_core_device *xe_vdev, u32 new)
|
||||
{
|
||||
u32 cur = xe_vdev->mig_state;
|
||||
int ret;
|
||||
|
||||
dev_dbg(xe_vdev_to_dev(xe_vdev),
|
||||
"state: %s->%s\n", vfio_dev_state_str(cur), vfio_dev_state_str(new));
|
||||
|
||||
/*
|
||||
* "STOP" handling is reused for "RUNNING_P2P", as the device doesn't
|
||||
* have the capability to selectively block outgoing p2p DMA transfers.
|
||||
* While the device is allowing BAR accesses when the VF is stopped, it
|
||||
* is not processing any new workload requests, effectively stopping
|
||||
* any outgoing DMA transfers (not just p2p).
|
||||
* Any VRAM / MMIO accesses occurring during "RUNNING_P2P" are kept and
|
||||
* will be migrated to target VF during stop-copy.
|
||||
*/
|
||||
if (cur == VFIO_DEVICE_STATE_RUNNING && new == VFIO_DEVICE_STATE_RUNNING_P2P) {
|
||||
ret = xe_sriov_vfio_suspend_device(xe_vdev->xe, xe_vdev->vfid);
|
||||
if (ret)
|
||||
goto err;
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
if ((cur == VFIO_DEVICE_STATE_RUNNING_P2P && new == VFIO_DEVICE_STATE_STOP) ||
|
||||
(cur == VFIO_DEVICE_STATE_STOP && new == VFIO_DEVICE_STATE_RUNNING_P2P))
|
||||
return NULL;
|
||||
|
||||
if (cur == VFIO_DEVICE_STATE_RUNNING_P2P && new == VFIO_DEVICE_STATE_RUNNING) {
|
||||
ret = xe_sriov_vfio_resume_device(xe_vdev->xe, xe_vdev->vfid);
|
||||
if (ret)
|
||||
goto err;
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
if (cur == VFIO_DEVICE_STATE_STOP && new == VFIO_DEVICE_STATE_STOP_COPY) {
|
||||
struct xe_vfio_pci_migration_file *migf;
|
||||
|
||||
migf = xe_vfio_pci_alloc_file(xe_vdev, XE_VFIO_FILE_SAVE);
|
||||
if (IS_ERR(migf)) {
|
||||
ret = PTR_ERR(migf);
|
||||
goto err;
|
||||
}
|
||||
get_file(migf->filp);
|
||||
|
||||
ret = xe_sriov_vfio_stop_copy_enter(xe_vdev->xe, xe_vdev->vfid);
|
||||
if (ret) {
|
||||
fput(migf->filp);
|
||||
goto err;
|
||||
}
|
||||
|
||||
return migf->filp;
|
||||
}
|
||||
|
||||
if (cur == VFIO_DEVICE_STATE_STOP_COPY && new == VFIO_DEVICE_STATE_STOP) {
|
||||
if (xe_vdev->migf)
|
||||
xe_vfio_pci_put_file(xe_vdev);
|
||||
|
||||
ret = xe_sriov_vfio_stop_copy_exit(xe_vdev->xe, xe_vdev->vfid);
|
||||
if (ret)
|
||||
goto err;
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
if (cur == VFIO_DEVICE_STATE_STOP && new == VFIO_DEVICE_STATE_RESUMING) {
|
||||
struct xe_vfio_pci_migration_file *migf;
|
||||
|
||||
migf = xe_vfio_pci_alloc_file(xe_vdev, XE_VFIO_FILE_RESUME);
|
||||
if (IS_ERR(migf)) {
|
||||
ret = PTR_ERR(migf);
|
||||
goto err;
|
||||
}
|
||||
get_file(migf->filp);
|
||||
|
||||
ret = xe_sriov_vfio_resume_data_enter(xe_vdev->xe, xe_vdev->vfid);
|
||||
if (ret) {
|
||||
fput(migf->filp);
|
||||
goto err;
|
||||
}
|
||||
|
||||
return migf->filp;
|
||||
}
|
||||
|
||||
if (cur == VFIO_DEVICE_STATE_RESUMING && new == VFIO_DEVICE_STATE_STOP) {
|
||||
if (xe_vdev->migf)
|
||||
xe_vfio_pci_put_file(xe_vdev);
|
||||
|
||||
ret = xe_sriov_vfio_resume_data_exit(xe_vdev->xe, xe_vdev->vfid);
|
||||
if (ret)
|
||||
goto err;
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
WARN(true, "Unknown state transition %d->%d", cur, new);
|
||||
return ERR_PTR(-EINVAL);
|
||||
|
||||
err:
|
||||
dev_dbg(xe_vdev_to_dev(xe_vdev),
|
||||
"Failed to transition state: %s->%s err=%d\n",
|
||||
vfio_dev_state_str(cur), vfio_dev_state_str(new), ret);
|
||||
return ERR_PTR(ret);
|
||||
}
|
||||
|
||||
static struct file *
|
||||
xe_vfio_pci_set_device_state(struct vfio_device *core_vdev,
|
||||
enum vfio_device_mig_state new_state)
|
||||
{
|
||||
struct xe_vfio_pci_core_device *xe_vdev =
|
||||
container_of(core_vdev, struct xe_vfio_pci_core_device, core_device.vdev);
|
||||
enum vfio_device_mig_state next_state;
|
||||
struct file *f = NULL;
|
||||
int ret;
|
||||
|
||||
xe_vfio_pci_state_mutex_lock(xe_vdev);
|
||||
while (new_state != xe_vdev->mig_state) {
|
||||
ret = vfio_mig_get_next_state(core_vdev, xe_vdev->mig_state,
|
||||
new_state, &next_state);
|
||||
if (ret) {
|
||||
xe_sriov_vfio_error(xe_vdev->xe, xe_vdev->vfid);
|
||||
f = ERR_PTR(ret);
|
||||
break;
|
||||
}
|
||||
f = xe_vfio_set_state(xe_vdev, next_state);
|
||||
if (IS_ERR(f))
|
||||
break;
|
||||
|
||||
xe_vdev->mig_state = next_state;
|
||||
|
||||
/* Multiple state transitions with non-NULL file in the middle */
|
||||
if (f && new_state != xe_vdev->mig_state) {
|
||||
fput(f);
|
||||
f = ERR_PTR(-EINVAL);
|
||||
break;
|
||||
}
|
||||
}
|
||||
xe_vfio_pci_state_mutex_unlock(xe_vdev);
|
||||
|
||||
return f;
|
||||
}
|
||||
|
||||
static int xe_vfio_pci_get_device_state(struct vfio_device *core_vdev,
|
||||
enum vfio_device_mig_state *curr_state)
|
||||
{
|
||||
struct xe_vfio_pci_core_device *xe_vdev =
|
||||
container_of(core_vdev, struct xe_vfio_pci_core_device, core_device.vdev);
|
||||
|
||||
xe_vfio_pci_state_mutex_lock(xe_vdev);
|
||||
*curr_state = xe_vdev->mig_state;
|
||||
xe_vfio_pci_state_mutex_unlock(xe_vdev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int xe_vfio_pci_get_data_size(struct vfio_device *vdev,
|
||||
unsigned long *stop_copy_length)
|
||||
{
|
||||
struct xe_vfio_pci_core_device *xe_vdev =
|
||||
container_of(vdev, struct xe_vfio_pci_core_device, core_device.vdev);
|
||||
|
||||
xe_vfio_pci_state_mutex_lock(xe_vdev);
|
||||
*stop_copy_length = xe_sriov_vfio_stop_copy_size(xe_vdev->xe, xe_vdev->vfid);
|
||||
xe_vfio_pci_state_mutex_unlock(xe_vdev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct vfio_migration_ops xe_vfio_pci_migration_ops = {
|
||||
.migration_set_state = xe_vfio_pci_set_device_state,
|
||||
.migration_get_state = xe_vfio_pci_get_device_state,
|
||||
.migration_get_data_size = xe_vfio_pci_get_data_size,
|
||||
};
|
||||
|
||||
static void xe_vfio_pci_migration_init(struct xe_vfio_pci_core_device *xe_vdev)
|
||||
{
|
||||
struct vfio_device *core_vdev = &xe_vdev->core_device.vdev;
|
||||
struct pci_dev *pdev = to_pci_dev(core_vdev->dev);
|
||||
struct xe_device *xe = xe_sriov_vfio_get_pf(pdev);
|
||||
|
||||
if (!xe)
|
||||
return;
|
||||
if (!xe_sriov_vfio_migration_supported(xe))
|
||||
return;
|
||||
|
||||
mutex_init(&xe_vdev->state_mutex);
|
||||
spin_lock_init(&xe_vdev->reset_lock);
|
||||
|
||||
/* PF internal control uses vfid index starting from 1 */
|
||||
xe_vdev->vfid = pci_iov_vf_id(pdev) + 1;
|
||||
xe_vdev->xe = xe;
|
||||
|
||||
core_vdev->migration_flags = VFIO_MIGRATION_STOP_COPY | VFIO_MIGRATION_P2P;
|
||||
core_vdev->mig_ops = &xe_vfio_pci_migration_ops;
|
||||
}
|
||||
|
||||
static void xe_vfio_pci_migration_fini(struct xe_vfio_pci_core_device *xe_vdev)
|
||||
{
|
||||
if (!xe_vdev->vfid)
|
||||
return;
|
||||
|
||||
mutex_destroy(&xe_vdev->state_mutex);
|
||||
}
|
||||
|
||||
static int xe_vfio_pci_init_dev(struct vfio_device *core_vdev)
|
||||
{
|
||||
struct xe_vfio_pci_core_device *xe_vdev =
|
||||
container_of(core_vdev, struct xe_vfio_pci_core_device, core_device.vdev);
|
||||
|
||||
xe_vfio_pci_migration_init(xe_vdev);
|
||||
|
||||
return vfio_pci_core_init_dev(core_vdev);
|
||||
}
|
||||
|
||||
static void xe_vfio_pci_release_dev(struct vfio_device *core_vdev)
|
||||
{
|
||||
struct xe_vfio_pci_core_device *xe_vdev =
|
||||
container_of(core_vdev, struct xe_vfio_pci_core_device, core_device.vdev);
|
||||
|
||||
xe_vfio_pci_migration_fini(xe_vdev);
|
||||
}
|
||||
|
||||
static const struct vfio_device_ops xe_vfio_pci_ops = {
|
||||
.name = "xe-vfio-pci",
|
||||
.init = xe_vfio_pci_init_dev,
|
||||
.release = xe_vfio_pci_release_dev,
|
||||
.open_device = xe_vfio_pci_open_device,
|
||||
.close_device = xe_vfio_pci_close_device,
|
||||
.ioctl = vfio_pci_core_ioctl,
|
||||
.device_feature = vfio_pci_core_ioctl_feature,
|
||||
.read = vfio_pci_core_read,
|
||||
.write = vfio_pci_core_write,
|
||||
.mmap = vfio_pci_core_mmap,
|
||||
.request = vfio_pci_core_request,
|
||||
.match = vfio_pci_core_match,
|
||||
.match_token_uuid = vfio_pci_core_match_token_uuid,
|
||||
.bind_iommufd = vfio_iommufd_physical_bind,
|
||||
.unbind_iommufd = vfio_iommufd_physical_unbind,
|
||||
.attach_ioas = vfio_iommufd_physical_attach_ioas,
|
||||
.detach_ioas = vfio_iommufd_physical_detach_ioas,
|
||||
};
|
||||
|
||||
static int xe_vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
|
||||
{
|
||||
struct xe_vfio_pci_core_device *xe_vdev;
|
||||
int ret;
|
||||
|
||||
xe_vdev = vfio_alloc_device(xe_vfio_pci_core_device, core_device.vdev, &pdev->dev,
|
||||
&xe_vfio_pci_ops);
|
||||
if (IS_ERR(xe_vdev))
|
||||
return PTR_ERR(xe_vdev);
|
||||
|
||||
dev_set_drvdata(&pdev->dev, &xe_vdev->core_device);
|
||||
|
||||
ret = vfio_pci_core_register_device(&xe_vdev->core_device);
|
||||
if (ret) {
|
||||
vfio_put_device(&xe_vdev->core_device.vdev);
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void xe_vfio_pci_remove(struct pci_dev *pdev)
|
||||
{
|
||||
struct xe_vfio_pci_core_device *xe_vdev = pci_get_drvdata(pdev);
|
||||
|
||||
vfio_pci_core_unregister_device(&xe_vdev->core_device);
|
||||
vfio_put_device(&xe_vdev->core_device.vdev);
|
||||
}
|
||||
|
||||
#define INTEL_PCI_VFIO_DEVICE(_id) { \
|
||||
PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_INTEL, (_id)) \
|
||||
}
|
||||
|
||||
static const struct pci_device_id xe_vfio_pci_table[] = {
|
||||
INTEL_PTL_IDS(INTEL_PCI_VFIO_DEVICE),
|
||||
INTEL_WCL_IDS(INTEL_PCI_VFIO_DEVICE),
|
||||
INTEL_BMG_IDS(INTEL_PCI_VFIO_DEVICE),
|
||||
{}
|
||||
};
|
||||
MODULE_DEVICE_TABLE(pci, xe_vfio_pci_table);
|
||||
|
||||
static struct pci_driver xe_vfio_pci_driver = {
|
||||
.name = "xe-vfio-pci",
|
||||
.id_table = xe_vfio_pci_table,
|
||||
.probe = xe_vfio_pci_probe,
|
||||
.remove = xe_vfio_pci_remove,
|
||||
.err_handler = &xe_vfio_pci_err_handlers,
|
||||
.driver_managed_dma = true,
|
||||
};
|
||||
module_pci_driver(xe_vfio_pci_driver);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("Michał Winiarski <michal.winiarski@intel.com>");
|
||||
MODULE_DESCRIPTION("VFIO PCI driver with migration support for Intel Graphics");
|
||||
|
|
@ -0,0 +1,143 @@
|
|||
/* 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
|
||||
Loading…
Reference in New Issue