cleanup swiotlb initialization v8

Christoph Hellwig
2022-04-04T05:05:44Z

Hi all,

this series tries to clean up the swiotlb initialization, including
that of swiotlb-xen. To get there is also removes the x86 iommu table
infrastructure that massively obsfucates the initialization path.

Git tree:

git://git.infradead.org/users/hch/misc.git swiotlb-init-cleanup

Gitweb:

http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/swiotlb-init-cleanup

Changes since v7:
- rebased to Linux 5.18-rc1
- better document the lower bound swiotlb size for xen-swiotlb
- improve the nslabs calculation for the retry case in
swiotlb_init_remap and swiotlb_init_late

Changes since v6:
- use IO_TLB_MIN_SLABS instead of open coding the constant
- call the remap callback later in swiotlb_init_late
- set SWIOTLB_ANY for xen/x86

Changes since v5:
- split a patch into three
- fix setting x86_swiotlb_enable for Xen
- fix a comment about forced bounce buffering for guest memory
encryption
- remove the xen_initial_domain check from
xen_create_contiguous_region

Changes since v3:
- fix a compilation issue on some powerpc configfs
- fix and cleanup how forced bounce buffering is enabled for
guest memory encryption

Changes since v2:
- make ppc_swiotlb_flags actually work again
- also force enable swiotlb for guest encrypted memory to cater
to hyperv which doesn't set the host encrypted memory flag

Changes since v1:
- skip IOMMU initialization on Xen PV kernels
- various small whitespace / typo fixes

Diffstat:
arch/ia64/include/asm/iommu_table.h | 7 -
arch/x86/include/asm/iommu_table.h | 102 -------------------
arch/x86/include/asm/swiotlb.h | 30 -----
arch/x86/kernel/pci-iommu_table.c | 77 --------------
arch/x86/kernel/pci-swiotlb.c | 77 --------------
arch/x86/xen/pci-swiotlb-xen.c | 96 ------------------
b/arch/arm/mm/init.c | 6 -
b/arch/arm/xen/mm.c | 26 ++--
b/arch/arm64/mm/init.c | 6 -
b/arch/ia64/mm/init.c | 4
b/arch/mips/cavium-octeon/dma-octeon.c | 15 --
b/arch/mips/loongson64/dma.c | 2
b/arch/mips/pci/pci-octeon.c | 2
b/arch/mips/sibyte/common/dma.c | 2
b/arch/powerpc/include/asm/svm.h | 4
b/arch/powerpc/include/asm/swiotlb.h | 1
b/arch/powerpc/kernel/dma-swiotlb.c | 1
b/arch/powerpc/mm/mem.c | 6 -
b/arch/powerpc/platforms/pseries/setup.c | 3
b/arch/powerpc/platforms/pseries/svm.c | 26 ----
b/arch/riscv/mm/init.c | 8 -
b/arch/s390/mm/init.c | 3
b/arch/x86/include/asm/dma-mapping.h | 12 --
b/arch/x86/include/asm/gart.h | 5
b/arch/x86/include/asm/iommu.h | 8 +
b/arch/x86/include/asm/xen/page.h | 5
b/arch/x86/include/asm/xen/swiotlb-xen.h | 2
b/arch/x86/kernel/Makefile | 2
b/arch/x86/kernel/amd_gart_64.c | 5
b/arch/x86/kernel/aperture_64.c | 14 --
b/arch/x86/kernel/cpu/mshyperv.c | 8 -
b/arch/x86/kernel/pci-dma.c | 114 +++++++++++++++++----
b/arch/x86/kernel/tboot.c | 1
b/arch/x86/kernel/vmlinux.lds.S | 12 --
b/arch/x86/mm/mem_encrypt_amd.c | 3
b/arch/x86/pci/sta2x11-fixup.c | 2
b/arch/x86/xen/Makefile | 2
b/drivers/iommu/amd/init.c | 6 -
b/drivers/iommu/amd/iommu.c | 5
b/drivers/iommu/intel/dmar.c | 6 -
b/drivers/xen/swiotlb-xen.c | 132 -------------------------
b/include/linux/dmar.h | 6 -
b/include/linux/swiotlb.h | 22 ++--
b/include/trace/events/swiotlb.h | 29 +----
b/include/xen/arm/page.h | 1
b/include/xen/swiotlb-xen.h | 8 +
b/kernel/dma/direct.h | 2
b/kernel/dma/swiotlb.c | 163 ++++++++++++++-----------------
48 files changed, 252 insertions(+), 827 deletions(-)