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bb500dbe2a
Add live migration support via the VFIO subsystem. The migration implementation aligns with the definition from uapi/vfio.h and uses the pds_core PF's adminq for device configuration. The ability to suspend, resume, and transfer VF device state data is included along with the required admin queue command structures and implementations. PDS_LM_CMD_SUSPEND and PDS_LM_CMD_SUSPEND_STATUS are added to support the VF device suspend operation. PDS_LM_CMD_RESUME is added to support the VF device resume operation. PDS_LM_CMD_STATE_SIZE is added to determine the exact size of the VF device state data. PDS_LM_CMD_SAVE is added to get the VF device state data. PDS_LM_CMD_RESTORE is added to restore the VF device with the previously saved data from PDS_LM_CMD_SAVE. PDS_LM_CMD_HOST_VF_STATUS is added to notify the DSC/firmware when a migration is in/not-in progress from the host's perspective. The DSC/firmware can use this to clear/setup any necessary state related to a migration. Signed-off-by: Brett Creeley <brett.creeley@amd.com> Signed-off-by: Shannon Nelson <shannon.nelson@amd.com> Reviewed-by: Simon Horman <horms@kernel.org> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Reviewed-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Link: https://lore.kernel.org/r/20230807205755.29579-6-brett.creeley@amd.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
42 lines
1.2 KiB
C
42 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
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#ifndef _LM_H_
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#define _LM_H_
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#include <linux/fs.h>
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#include <linux/mutex.h>
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#include <linux/scatterlist.h>
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#include <linux/types.h>
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#include <linux/pds/pds_common.h>
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#include <linux/pds/pds_adminq.h>
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struct pds_vfio_lm_file {
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struct file *filep;
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struct mutex lock; /* protect live migration data file */
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u64 size; /* Size with valid data */
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u64 alloc_size; /* Total allocated size. Always >= len */
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void *page_mem; /* memory allocated for pages */
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struct page **pages; /* Backing pages for file */
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unsigned long long npages;
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struct sg_table sg_table; /* SG table for backing pages */
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struct pds_lm_sg_elem *sgl; /* DMA mapping */
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dma_addr_t sgl_addr;
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u16 num_sge;
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struct scatterlist *last_offset_sg; /* Iterator */
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unsigned int sg_last_entry;
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unsigned long last_offset;
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};
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struct pds_vfio_pci_device;
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struct file *
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pds_vfio_step_device_state_locked(struct pds_vfio_pci_device *pds_vfio,
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enum vfio_device_mig_state next);
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void pds_vfio_put_save_file(struct pds_vfio_pci_device *pds_vfio);
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void pds_vfio_put_restore_file(struct pds_vfio_pci_device *pds_vfio);
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#endif /* _LM_H_ */
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