On Thu, 18 Apr 2019, Julien Grall wrote: > When an MSI doorbell is located downstream of an IOMMU, it is required > to swizzle the physical address with an appropriately-mapped IOVA for any > device attached to one of our DMA ops domain. > > At the moment, the allocation of the mapping may be done when composing > the message. However, the composing may be done in non-preemtible > context while the allocation requires to be called from preemptible > context. > > A follow-up patch will split the current logic in two functions > requiring to keep an IOMMU cookie per MSI. > > This patch introduces a new field in msi_desc to store an IOMMU cookie > when CONFIG_IOMMU_DMA is selected. # git grep 'This patch' Documentation/process/ Applied to the whole series. Thanks tglx
