linux-dev/drivers/iommu/amd/Kconfig, branch master

iommu/dma: Clean up Kconfig

2022-09-07T12:46:59Z

Although iommu-dma is a per-architecture chonce, that is currently implemented in a rather haphazard way. Selecting from the arch Kconfig was the original logical approach, but is complicated by having to manage dependencies; conversely, selecting from drivers ends up hiding the architecture dependency *too* well. Instead, let's just have it enable itself automatically when IOMMU API support is enabled for the relevant architectures. It can't get much clearer than that. Signed-off-by: Robin Murphy Acked-by: Catalin Marinas Link: https://lore.kernel.org/r/2e33c8bc2b1bb478157b7964bfed976cb7466139.1660668998.git.robin.murphy@arm.com Signed-off-by: Joerg Roedel

iommu/amd: Prepare for generic IO page table framework

2021-01-28T15:51:17Z

Add initial hook up code to implement generic IO page table framework. Signed-off-by: Suravee Suthikulpanit Link: https://lore.kernel.org/r/20201215073705.123786-3-suravee.suthikulpanit@amd.com Signed-off-by: Joerg Roedel

iommu/amd: Use cmpxchg_double() when updating 128-bit IRTE

2020-09-04T09:53:18Z

When using 128-bit interrupt-remapping table entry (IRTE) (a.k.a GA mode), current driver disables interrupt remapping when it updates the IRTE so that the upper and lower 64-bit values can be updated safely. However, this creates a small window, where the interrupt could arrive and result in IO_PAGE_FAULT (for interrupt) as shown below. IOMMU Driver Device IRQ ============ =========== irte.RemapEn=0 ... change IRTE IRQ from device ==> IO_PAGE_FAULT !! ... irte.RemapEn=1 This scenario has been observed when changing irq affinity on a system running I/O-intensive workload, in which the destination APIC ID in the IRTE is updated. Instead, use cmpxchg_double() to update the 128-bit IRTE at once without disabling the interrupt remapping. However, this means several features, which require GA (128-bit IRTE) support will also be affected if cmpxchg16b is not supported (which is unprecedented for AMD processors w/ IOMMU). Fixes: 880ac60e2538 ("iommu/amd: Introduce interrupt remapping ops structure") Reported-by: Sean Osborne Signed-off-by: Suravee Suthikulpanit Tested-by: Erik Rockstrom Reviewed-by: Joao Martins Link: https://lore.kernel.org/r/20200903093822.52012-3-suravee.suthikulpanit@amd.com Signed-off-by: Joerg Roedel

iommu/amd: Move Kconfig and Makefile bits down into amd directory

2020-07-29T12:15:36Z

Move AMD Kconfig and Makefile bits down into the amd directory with the rest of the AMD specific files. Signed-off-by: Jerry Snitselaar Cc: Joerg Roedel Cc: Suravee Suthikulpanit Link: https://lore.kernel.org/r/20200630200636.48600-3-jsnitsel@redhat.com Signed-off-by: Joerg Roedel