Hi all, IDXD kernel work queues were disabled due to the flawed use of kernel VA and SVA API. Link: https://lore.kernel.org/linux-iommu/20210511194726.GP1002214@xxxxxxxxxx/ The solution is to enable it under DMA API where IDXD shared workqueue users can use ENQCMDS to submit work on buffers mapped by DMA API. This patchset adds support for attaching PASID to the device's default domain and the ability to reserve global PASIDs from SVA APIs. We can then re-enable the kernel work queues and use them under DMA API. This depends on the IOASID removal series. https://lore.kernel.org/all/ZCaUBJvUMsJyD7EW@xxxxxxxxxx/ Thanks, Jacob --- Changelog: v3: - moved global PASID allocation API from SVA to IOMMU (Kevin) - remove #ifdef around global PASID reservation during boot (Baolu) - remove restriction on PASID 0 allocation (Baolu) - fix a bug in sysfs domain change when attaching devices - clear idxd user interrupt enable bit after disabling device( Fenghua) v2: - refactored device PASID attach domain ops based on Baolu's early patch - addressed TLB flush gap - explicitly reserve RID_PASID from SVA PASID number space - get dma domain directly, avoid checking domain types Jacob Pan (7): iommu/vt-d: Use non-privileged mode for all PASIDs iommu/vt-d: Remove PASID supervisor request support iommu/sva: Support allocation of global PASIDs outside SVA iommu/vt-d: Reserve RID_PASID from global PASID space iommu/vt-d: Make device pasid attachment explicit iommu/vt-d: Implement set_dev_pasid domain op dmaengine/idxd: Re-enable kernel workqueue under DMA API drivers/dma/idxd/device.c | 30 +----- drivers/dma/idxd/init.c | 56 ++++++++++- drivers/dma/idxd/sysfs.c | 7 -- drivers/iommu/intel/iommu.c | 180 +++++++++++++++++++++++++++++------- drivers/iommu/intel/iommu.h | 8 ++ drivers/iommu/intel/pasid.c | 43 --------- drivers/iommu/intel/pasid.h | 7 -- drivers/iommu/iommu-sva.c | 10 +- drivers/iommu/iommu.c | 33 +++++++ include/linux/iommu.h | 10 ++ 10 files changed, 257 insertions(+), 127 deletions(-) -- 2.25.1
