| // SPDX-License-Identifier: MIT |
| /* |
| * Copyright © 2023-2024 Intel Corporation |
| */ |
| |
| #include <drm/drm_debugfs.h> |
| #include <drm/drm_managed.h> |
| |
| #include "xe_gt.h" |
| #include "xe_gt_sriov_vf.h" |
| #include "xe_guc.h" |
| #include "xe_sriov_printk.h" |
| #include "xe_sriov_vf.h" |
| #include "xe_sriov_vf_ccs.h" |
| |
| /** |
| * DOC: VF restore procedure in PF KMD and VF KMD |
| * |
| * Restoring previously saved state of a VF is one of core features of |
| * SR-IOV. All major VM Management applications allow saving and restoring |
| * the VM state, and doing that to a VM which uses SRIOV VF as one of |
| * the accessible devices requires support from KMD on both PF and VF side. |
| * VMM initiates all required operations through VFIO module, which then |
| * translates them into PF KMD calls. This description will focus on these |
| * calls, leaving out the module which initiates these steps (VFIO). |
| * |
| * In order to start the restore procedure, GuC needs to keep the VF in |
| * proper state. The PF driver can ensure GuC set it to VF_READY state |
| * by provisioning the VF, which in turn can be done after Function Level |
| * Reset of said VF (or after it was freshly created - in that case FLR |
| * is not needed). The FLR procedure ends with GuC sending message |
| * `GUC_PF_NOTIFY_VF_FLR_DONE`, and then provisioning data is sent to GuC. |
| * After the provisioning is completed, the VF needs to be paused, and |
| * at that point the actual restore can begin. |
| * |
| * During VF Restore, state of several resources is restored. These may |
| * include local memory content (system memory is restored by VMM itself), |
| * values of MMIO registers, stateless compression metadata and others. |
| * The final resource which also needs restoring is state of the VF |
| * submission maintained within GuC. For that, `GUC_PF_OPCODE_VF_RESTORE` |
| * message is used, with reference to the state blob to be consumed by |
| * GuC. |
| * |
| * Next, when VFIO is asked to set the VM into running state, the PF driver |
| * sends `GUC_PF_TRIGGER_VF_RESUME` to GuC. When sent after restore, this |
| * changes VF state within GuC to `VF_RESFIX_BLOCKED` rather than the |
| * usual `VF_RUNNING`. At this point GuC triggers an interrupt to inform |
| * the VF KMD within the VM that it was migrated. |
| * |
| * As soon as Virtual GPU of the VM starts, the VF driver within receives |
| * the MIGRATED interrupt and schedules post-migration recovery worker. |
| * That worker queries GuC for new provisioning (using MMIO communication), |
| * and applies fixups to any non-virtualized resources used by the VF. |
| * |
| * When the VF driver is ready to continue operation on the newly connected |
| * hardware, it sends `VF2GUC_NOTIFY_RESFIX_DONE` which causes it to |
| * enter the long awaited `VF_RUNNING` state, and therefore start handling |
| * CTB messages and scheduling workloads from the VF:: |
| * |
| * PF GuC VF |
| * [ ] | | |
| * [ ] PF2GUC_VF_CONTROL(pause) | | |
| * [ ]---------------------------> [ ] | |
| * [ ] [ ] GuC sets new VF state to | |
| * [ ] [ ]------- VF_READY_PAUSED | |
| * [ ] [ ] | | |
| * [ ] [ ] <----- | |
| * [ ] success [ ] | |
| * [ ] <---------------------------[ ] | |
| * [ ] | | |
| * [ ] PF loads resources from the | | |
| * [ ]------- saved image supplied | | |
| * [ ] | | | |
| * [ ] <----- | | |
| * [ ] | | |
| * [ ] GUC_PF_OPCODE_VF_RESTORE | | |
| * [ ]---------------------------> [ ] | |
| * [ ] [ ] GuC loads contexts and CTB | |
| * [ ] [ ]------- state from image | |
| * [ ] [ ] | | |
| * [ ] [ ] <----- | |
| * [ ] [ ] | |
| * [ ] [ ] GuC sets new VF state to | |
| * [ ] [ ]------- VF_RESFIX_PAUSED | |
| * [ ] [ ] | | |
| * [ ] success [ ] <----- | |
| * [ ] <---------------------------[ ] | |
| * [ ] | | |
| * [ ] GUC_PF_TRIGGER_VF_RESUME | | |
| * [ ]---------------------------> [ ] | |
| * [ ] [ ] GuC sets new VF state to | |
| * [ ] [ ]------- VF_RESFIX_BLOCKED | |
| * [ ] [ ] | | |
| * [ ] [ ] <----- | |
| * [ ] [ ] | |
| * [ ] [ ] GUC_INTR_SW_INT_0 | |
| * [ ] success [ ]---------------------------> [ ] |
| * [ ] <---------------------------[ ] [ ] |
| * | | VF2GUC_QUERY_SINGLE_KLV [ ] |
| * | [ ] <---------------------------[ ] |
| * | [ ] [ ] |
| * | [ ] new VF provisioning [ ] |
| * | [ ]---------------------------> [ ] |
| * | | [ ] |
| * | | VF driver applies post [ ] |
| * | | migration fixups -------[ ] |
| * | | | [ ] |
| * | | -----> [ ] |
| * | | [ ] |
| * | | VF2GUC_NOTIFY_RESFIX_DONE [ ] |
| * | [ ] <---------------------------[ ] |
| * | [ ] [ ] |
| * | [ ] GuC sets new VF state to [ ] |
| * | [ ]------- VF_RUNNING [ ] |
| * | [ ] | [ ] |
| * | [ ] <----- [ ] |
| * | [ ] success [ ] |
| * | [ ]---------------------------> [ ] |
| * | | | |
| * | | | |
| */ |
| |
| /** |
| * xe_sriov_vf_migration_supported - Report whether SR-IOV VF migration is |
| * supported or not. |
| * @xe: the &xe_device to check |
| * |
| * Returns: true if VF migration is supported, false otherwise. |
| */ |
| bool xe_sriov_vf_migration_supported(struct xe_device *xe) |
| { |
| xe_assert(xe, IS_SRIOV_VF(xe)); |
| return !xe->sriov.vf.migration.disabled; |
| } |
| |
| /** |
| * xe_sriov_vf_migration_disable - Turn off VF migration with given log message. |
| * @xe: the &xe_device instance. |
| * @fmt: format string for the log message, to be combined with following VAs. |
| */ |
| void xe_sriov_vf_migration_disable(struct xe_device *xe, const char *fmt, ...) |
| { |
| struct va_format vaf; |
| va_list va_args; |
| |
| xe_assert(xe, IS_SRIOV_VF(xe)); |
| |
| va_start(va_args, fmt); |
| vaf.fmt = fmt; |
| vaf.va = &va_args; |
| xe_sriov_notice(xe, "migration disabled: %pV\n", &vaf); |
| va_end(va_args); |
| |
| xe->sriov.vf.migration.disabled = true; |
| } |
| |
| static void vf_migration_init_early(struct xe_device *xe) |
| { |
| if (!xe_device_has_memirq(xe)) |
| return xe_sriov_vf_migration_disable(xe, "requires memory-based IRQ support"); |
| |
| } |
| |
| /** |
| * xe_sriov_vf_init_early - Initialize SR-IOV VF specific data. |
| * @xe: the &xe_device to initialize |
| */ |
| void xe_sriov_vf_init_early(struct xe_device *xe) |
| { |
| vf_migration_init_early(xe); |
| } |
| |
| /** |
| * xe_sriov_vf_init_late() - SR-IOV VF late initialization functions. |
| * @xe: the &xe_device to initialize |
| * |
| * This function initializes code for CCS migration. |
| * |
| * Return: 0 on success or a negative error code on failure. |
| */ |
| int xe_sriov_vf_init_late(struct xe_device *xe) |
| { |
| return xe_sriov_vf_ccs_init(xe); |
| } |
| |
| static int sa_info_vf_ccs(struct seq_file *m, void *data) |
| { |
| struct drm_info_node *node = m->private; |
| struct xe_device *xe = to_xe_device(node->minor->dev); |
| struct drm_printer p = drm_seq_file_printer(m); |
| |
| xe_sriov_vf_ccs_print(xe, &p); |
| return 0; |
| } |
| |
| static const struct drm_info_list debugfs_list[] = { |
| { .name = "sa_info_vf_ccs", .show = sa_info_vf_ccs }, |
| }; |
| |
| /** |
| * xe_sriov_vf_debugfs_register - Register VF debugfs attributes. |
| * @xe: the &xe_device |
| * @root: the root &dentry |
| * |
| * Prepare debugfs attributes exposed by the VF. |
| */ |
| void xe_sriov_vf_debugfs_register(struct xe_device *xe, struct dentry *root) |
| { |
| drm_debugfs_create_files(debugfs_list, ARRAY_SIZE(debugfs_list), |
| root, xe->drm.primary); |
| } |
