A permanently wedged device can still access hardware through pending work, existing VRAM mappings and background driver paths. This can cause unwanted DMA or MMIO access while userspace is preparing device recovery.
This series separates temporary PCI error recovery from permanent wedging and introduces a common device-I/O-blocked state. After a permanent wedge, the driver: - stops queued VM, SVM and GuC work. - shuts down the display. - invalidates existing CPU mappings to VRAM. - maps later CPU faults to a per-BO dummy page. - stops interrupts and clears PCI bus mastering. - rejects new VRAM allocations. - notifies userspace only after isolation completes. - drops queued page faults and stops VM, SVM and GuC work. System suspend waits for wedge isolation to complete before skipping the normal suspend path. The worker cannot reach synchronize_srcu() until all GTs have been declared wedged and their pending fences have been signalled. The device remains isolated until userspace performs the advertised recovery, such as driver rebind or bus reset. The series also fixes IRQ uninstall so requested handlers are freed after interrupts have already been suspended. Arvind Yadav (13): drm/xe/irq: Always free requested IRQs on uninstall drm/xe: Separate AER reset state from device wedging drm/xe: Drop queued page faults when device I/O is blocked drm/xe: Stop VM work when device I/O is blocked drm/xe: Send wedged notification from a worker drm/xe: Reuse one dummy page per BO after wedge drm/xe: Invalidate existing VRAM mappings on wedge drm/xe/irq: Serialize IRQ suspend and resume drm/xe: Isolate a wedged device before notifying userspace drm/xe/ttm: Reject VRAM allocations on wedged devices drm/xe/guc: Skip timeout recovery on a wedged device drm/xe: Skip PM notifier preparation for wedged devices drm/xe: Block BO VM access when device I/O is unavailable drivers/gpu/drm/xe/display/xe_display.c | 18 +++- drivers/gpu/drm/xe/xe_bo.c | 101 +++++++++++++++++++- drivers/gpu/drm/xe/xe_bo.h | 1 + drivers/gpu/drm/xe/xe_bo_types.h | 4 + drivers/gpu/drm/xe/xe_device.c | 118 ++++++++++++++++++++---- drivers/gpu/drm/xe/xe_device.h | 12 +++ drivers/gpu/drm/xe/xe_device_types.h | 26 ++++++ drivers/gpu/drm/xe/xe_guc_ct.c | 4 +- drivers/gpu/drm/xe/xe_guc_pc.c | 10 +- drivers/gpu/drm/xe/xe_guc_rc.c | 4 +- drivers/gpu/drm/xe/xe_guc_submit.c | 13 ++- drivers/gpu/drm/xe/xe_guc_tlb_inval.c | 8 +- drivers/gpu/drm/xe/xe_irq.c | 32 +++++-- drivers/gpu/drm/xe/xe_pagefault.c | 40 ++++++++ drivers/gpu/drm/xe/xe_pci.c | 23 ++++- drivers/gpu/drm/xe/xe_pci_error.c | 22 ++--- drivers/gpu/drm/xe/xe_pm.c | 27 ++++++ drivers/gpu/drm/xe/xe_sriov_pf.c | 2 +- drivers/gpu/drm/xe/xe_svm.c | 21 ++++- drivers/gpu/drm/xe/xe_ttm_vram_mgr.c | 4 + drivers/gpu/drm/xe/xe_vm.c | 16 ++++ 21 files changed, 446 insertions(+), 60 deletions(-) -- 2.43.0
