When IDXD device hits hardware errors, it enters halt state and triggers an interrupt to IDXD driver. Currently IDXD driver just prints an error message in the interrupt handler. A better way to handle the interrupt is to do Function Level Reset (FLR) and recover the device's hardware and software configurations to its previous working state. The device and software can continue to run after the interrupt. This series enables this FLR handling for IDXD device whose WQs are all user type. FLR handling for IDXD device whose WQs are kernel type will be implemented in a future series. Change log: v2: - Patch 3: Call a free helper to free all saved configs (Dave Jiang). - Patch 3: Replace defined bitmap free function with existing bitmpa_free(). v1: https://lore.kernel.org/lkml/20240705181519.4067507-1-fenghua.yu@xxxxxxxxx/ Fenghua Yu (5): dmaengine: idxd: Add idxd_pci_probe_alloc() helper dmaengine: idxd: Binding and unbinding IDXD device and driver dmaengine: idxd: Add idxd_device_config_save() and idxd_device_config_restore() helpers dmaengine: idxd: Refactor halt handler dmaengine: idxd: Enable Function Level Reset (FLR) for halt drivers/dma/idxd/idxd.h | 13 ++ drivers/dma/idxd/init.c | 479 ++++++++++++++++++++++++++++++++++++---- drivers/dma/idxd/irq.c | 85 ++++--- 3 files changed, 507 insertions(+), 70 deletions(-) -- 2.37.1
